BOK FINANCIAL CORP ET AL, 10-Q filed on 10/30/2019
Quarterly Report
v3.19.3
Document And Entity Information
 9 Months Ended
Sep. 30, 2019
shares
Document and Entity Information [Abstract]  
Entity Incorporation, State or Country Code OK
Entity Tax Identification Number 73-1373454
Entity Address, Address Line One Boston Avenue at Second Street
Entity Address, City or Town Tulsa,
Entity Address, State or Province OK
Document Transition Report false
Document Quarterly Report true
Entity Registrant Name BOK FINANCIAL CORP ET AL
Entity Central Index Key 0000875357
Current Fiscal Year End Date --12-31
Entity Emerging Growth Company false
Entity Bankruptcy Proceedings, Reporting Current false
Entity Small Business false
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 70,858,010
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q3
Document Type 10-Q
Entity File Number 0-19341
Amendment Flag false
Document Period End Date Sep. 30, 2019
City Area Code 918
Local Phone Number 588-6000
Entity Address, Postal Zip Code 74192
v3.19.3
Consolidated Statements of Earnings (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Interest revenue [Abstract]        
Loans $ 286,694 $ 218,732 $ 859,898 $ 617,517
Residential mortgage loans held for sale 1,891 2,151 5,308 6,328
Trading securities 14,452 17,295 48,645 38,021
Investment securities 3,221 3,598 10,160 11,118
Available for sale securities 67,633 48,917 184,344 142,303
Fair value option securities 10,708 3,881 23,448 12,627
Restricted equity securities 7,558 5,232 20,419 15,757
Interest-bearing cash and cash equivalents 3,050 3,441 9,879 19,163
Total interest revenue 395,207 303,247 1,162,101 862,834
Interest expense [Abstract]        
Deposits 46,917 24,535 127,517 63,717
Borrowed funds 65,381 35,804 180,595 93,860
Subordinated debentures 3,813 2,025 11,359 6,076
Total interest expense 116,111 62,364 319,471 163,653
Net interest revenue 279,096 240,883 842,630 699,181
Provision for credit losses 12,000 4,000 25,000 (1,000)
Net interest revenue after provision for credit losses 267,096 236,883 817,630 700,181
Total fees and commissions 186,119 166,197 522,779 483,069
Other gains, net 4,544 2,754 11,000 6,040
Gain (loss) on derivatives, net 3,778 (2,847) 19,595 (11,589)
Gain (loss) on fair value option securities, net 4,597 (4,385) 24,115 (25,290)
Change in fair value of mortgage servicing rights (12,593) 5,972 (62,814) 28,901
Gain (loss) on available for sale securities, net 5 250 1,110 (802)
Total other operating revenue 186,450 167,941 515,785 480,329
Other operating expense [Abstract]        
Personnel 162,573 143,531 492,143 422,425
Business promotion 8,859 7,620 26,875 21,316
Charitable contributions to BOKF Foundation 0 0 1,000 0
Professional fees and services 12,312 13,209 41,453 38,387
Net occupancy and equipment 27,558 23,394 83,959 70,201
Insurance 4,220 6,232 15,513 19,070
Data processing and communications 31,915 31,665 93,099 87,221
Printing, postage and supplies 3,825 3,837 12,817 11,937
Net losses and operating expenses of repossessed assets 1,728 4,044 4,304 14,471
Amortization of intangible assets 5,064 1,603 15,393 4,289
Mortgage banking costs 14,975 11,741 36,426 34,780
Other expense 6,263 5,741 20,604 19,426
Total other operating expense 279,292 252,617 843,586 743,523
Net income before taxes 174,254 152,207 489,829 436,987
Federal and state income taxes 32,396 34,662 99,926 98,940
Net income 141,858 117,545 389,903 338,047
Net income (loss) attributable to non-controlling interests (373) 289 (503) 857
Net income attributable to BOK Financial Corporation shareholders $ 142,231 $ 117,256 $ 390,406 $ 337,190
Earnings per share: [Abstract]        
Basic $ 2.00 $ 1.79 $ 5.47 $ 5.15
Diluted $ 2.00 $ 1.79 $ 5.47 $ 5.15
Average shares used in computation: [Abstract]        
Basic 70,596,307 64,901,095 70,953,544 64,883,319
Diluted 70,609,924 64,934,351 70,968,845 64,919,728
Dividends declared per share $ 0.50 $ 0.50 $ 1.50 $ 1.40
Brokerage and trading revenue [Member]        
Total fees and commissions $ 43,840 $ 23,086 $ 115,983 $ 80,222
Transaction card revenue [Member]        
Total fees and commissions 22,015 21,396 64,668 63,361
Fiduciary and asset management revenue [Member]        
Total fees and commissions 43,621 57,514 132,004 141,038
Deposit service charges and fees [Member]        
Total fees and commissions 28,837 27,765 85,154 82,760
Mortgage banking revenue [Member]        
Total fees and commissions 30,180 23,536 82,145 75,907
Other revenue [Member]        
Total fees and commissions $ 17,626 $ 12,900 $ 42,825 $ 39,781
v3.19.3
Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net income $ 141,858 $ 117,545 $ 389,903 $ 338,047
Other comprehensive income (loss) before income taxes:        
Net change in unrealized gain (loss) 46,285 (35,941) 274,441 (166,464)
Reclassification adjustments included in earnings:        
Loss (gain) on available for sale securities, net (5) (250) (1,110) 802
Other comprehensive income (loss) before income taxes 46,280 (36,191) 273,331 (165,662)
Federal and state income taxes 11,096 (9,134) 66,993 [1] (42,183) [1]
Other comprehensive income (loss), net of income taxes 35,184 (27,057) 206,338 (123,479)
Comprehensive income 177,042 90,488 596,241 214,568
Comprehensive income (loss) attributable to non-controlling interests (373) 289 (503) 857
Comprehensive income attributable to BOK Financial Corp. shareholders $ 177,415 $ 90,199 $ 596,744 $ 213,711
[1]
Calculated using a 25 percent blended federal and state statutory tax rate.
v3.19.3
Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets [Abstract]    
Cash and due from banks $ 761,130 $ 741,749
Interest-bearing cash and cash equivalents 465,458 401,675
Trading securities 1,675,212 1,956,923
Investment securities 304,224 355,187
Available for sale securities 11,024,551 8,857,120
Fair value option securities 1,816,398 283,235
Restricted equity securities 479,018 344,447
Residential mortgage loans held for sale 282,487 149,221
Loans 22,285,367 21,656,730
Allowance for loan losses (204,432) (207,457)
Loans, net of allowance 22,080,935 21,449,273
Premises and equipment, net 516,597 330,033
Receivables 219,420 204,960
Goodwill 1,048,091 1,049,263
Intangible assets, net 124,320 134,849
Mortgage servicing rights 193,661 259,254
Real estate and other repossessed assets, net of allowance 21,026 17,487
Derivative contracts, net 352,019 320,929
Cash surrender value of bank-owned life insurance 387,035 381,608
Receivable on unsettled securities sales 904,630 336,400
Other assets 470,993 446,891
Total assets 43,127,205 38,020,504
Deposits [Abstract]    
Noninterest-bearing demand deposits 9,844,397 10,414,592
Interest-bearing deposits: [Abstract]    
Transaction 13,521,545 12,206,576
Savings 557,593 529,215
Time 2,243,541 2,113,380
Total deposits 26,167,076 25,263,763
Funds purchased and repurchase agreements 3,413,051 1,018,411
Other borrowings 6,822,334 6,124,390
Subordinated debentures 275,909 275,913
Accrued interest, taxes and expense 218,775 192,826
Derivative contracts, net 336,791 362,306
Due on unsettled securities purchases 703,448 156,370
Other liabilities 352,156 183,480
Total liabilities 38,289,540 33,577,459
Shareholders' equity: [Abstract]    
Common stock 5 5
Capital surplus 1,346,730 1,334,030
Retained earnings 3,655,590 3,369,654
Treasury stock (307,062) (198,995)
Accumulated other comprehensive gain (loss) 133,753 (72,585)
Total shareholders’ equity 4,829,016 4,432,109
Non-controlling interests 8,649 10,936
Total equity 4,837,665 4,443,045
Total liabilities and equity $ 43,127,205 $ 38,020,504
v3.19.3
Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investment securities [Abstract]    
Investment Securities, fair value $ 324,021 $ 367,298
Allowance for real estate and other repossessed assets $ 11,278 $ 13,665
Shareholders' equity: [Abstract]    
Common stock, par value (in dollars per share) $ 0.00006 $ 0.00006
Common stock, shares authorized (in shares) 2,500,000,000 2,500,000,000
Common stock, shares issued (in shares) 75,757,009 75,711,492
Common stock, shares outstanding (in shares) 75,757,009 75,711,492
Treasury stock, shares at cost (in shares) 4,898,999 3,588,560
v3.19.3
Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total Shareholders' Equity [Member]
Non-Controlling Interests [Member]
Transition adjustment for new accounting principle in period of adoption $ (2,709)     $ 2,709   $ (2,709)    
Balance, beginning of period, adjusted 3,518,334 $ 4 $ 1,035,895 3,051,196 $ (552,845) (38,883) $ 3,495,367 $ 22,967
Balance, beginning of period (in shares) at Dec. 31, 2017   75,148     9,753      
Balance, beginning of period at Dec. 31, 2017 3,518,334 $ 4 1,035,895 3,048,487 $ (552,845) (36,174) 3,495,367 22,967
Net income 338,047     337,190     337,190 857
Other comprehensive income (loss) (123,479)         (123,479) (123,479)  
Repurchase of common stock (in shares)         90      
Repurchase of common stock (8,408)       $ (8,408)   (8,408)  
Stock options exercised (in shares)   49            
Stock options exercised 2,560   2,560       2,560  
Non-vested shares awarded, net (in shares)   112            
Non-vested shares awarded, net     0          
Vesting of non-vested shares (in shares)         31      
Vesting of non-vested shares (2,870)       $ (2,870)   (2,870)  
Share-based compensation 5,975   5,975       5,975  
Cash dividends on common stock (91,303)     (91,303)     (91,303)  
Capital calls and distributions, net (13,096)             (13,096)
Balance, end of period (in shares) at Sep. 30, 2018   75,309     9,874      
Balance, end of period at Sep. 30, 2018 3,625,760 $ 4 1,044,430 3,297,083 $ (564,123) (162,362) 3,615,032 10,728
Balance, beginning of period (in shares) at Jun. 30, 2018   75,314     9,874      
Balance, beginning of period at Jun. 30, 2018 3,576,045 $ 4 1,040,202 3,212,653 $ (564,123) (135,305) 3,553,431 22,614
Net income 117,545     117,256     117,256 289
Other comprehensive income (loss) (27,057)         (27,057) (27,057)  
Repurchase of common stock (in shares)         0      
Repurchase of common stock 0       $ 0   0  
Stock options exercised (in shares)   3            
Stock options exercised 134   134       134  
Non-vested shares awarded, net (in shares)   (8)            
Non-vested shares awarded, net     0          
Vesting of non-vested shares (in shares)         0      
Vesting of non-vested shares 0       $ 0   0  
Share-based compensation 4,094   4,094       4,094  
Cash dividends on common stock (32,826)     (32,826)     (32,826)  
Capital calls and distributions, net (12,175)             (12,175)
Balance, end of period (in shares) at Sep. 30, 2018   75,309     9,874      
Balance, end of period at Sep. 30, 2018 3,625,760 $ 4 1,044,430 3,297,083 $ (564,123) (162,362) 3,615,032 10,728
Transition adjustment for new accounting principle in period of adoption 2,862     2,862     2,862  
Balance, beginning of period, adjusted 4,445,907 $ 5 1,334,030 3,372,516 $ (198,995) (72,585) 4,434,971 10,936
Balance, beginning of period (in shares) at Dec. 31, 2018   75,711     3,589      
Balance, beginning of period at Dec. 31, 2018 4,443,045 $ 5 1,334,030 3,369,654 $ (198,995) (72,585) 4,432,109 10,936
Net income 389,903     390,406     390,406 (503)
Other comprehensive income (loss) 206,338         206,338 206,338  
Repurchase of common stock (in shares)         1,292      
Repurchase of common stock (106,639)       $ (106,639)   (106,639)  
Stock options exercised (in shares)   21            
Stock options exercised 1,080   1,080       1,080  
Non-vested shares awarded, net (in shares)   25            
Non-vested shares awarded, net     0          
Vesting of non-vested shares (in shares)         18      
Vesting of non-vested shares (1,428)       $ (1,428)   (1,428)  
Share-based compensation 11,620   11,620       11,620  
Cash dividends on common stock (107,332)     (107,332)     (107,332)  
Capital calls and distributions, net (1,784)             (1,784)
Balance, end of period (in shares) at Sep. 30, 2019   75,757     4,899      
Balance, end of period at Sep. 30, 2019 4,837,665 $ 5 1,346,730 3,655,590 $ (307,062) 133,753 4,829,016 8,649
Balance, beginning of period (in shares) at Jun. 30, 2019   75,756     4,562      
Balance, beginning of period at Jun. 30, 2019 4,718,475 $ 5 1,343,082 3,548,907 $ (281,125) 98,569 4,709,438 9,037
Net income 141,858     142,231     142,231 (373)
Other comprehensive income (loss) 35,184         35,184 35,184  
Repurchase of common stock (in shares)         337      
Repurchase of common stock (25,937)       $ (25,937)   (25,937)  
Stock options exercised (in shares)   3            
Stock options exercised 177   177       177  
Non-vested shares awarded, net (in shares)   (2)            
Non-vested shares awarded, net     0          
Vesting of non-vested shares (in shares)         0      
Vesting of non-vested shares         $ 0   0  
Share-based compensation 3,471   3,471       3,471  
Cash dividends on common stock (35,548)     (35,548)     (35,548)  
Capital calls and distributions, net (15)             (15)
Balance, end of period (in shares) at Sep. 30, 2019   75,757     4,899      
Balance, end of period at Sep. 30, 2019 $ 4,837,665 $ 5 $ 1,346,730 $ 3,655,590 $ (307,062) $ 133,753 $ 4,829,016 $ 8,649
v3.19.3
Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash Flows From Operating Activities: [Abstract]    
Net income $ 389,903 $ 338,047
Adjustments to reconcile net income to net cash used in operating activities:    
Provision for credit losses 25,000 (1,000)
Change in fair value of mortgage servicing rights due to market changes 62,814 (28,901)
Change in the fair value of mortgage servicing rights due to principal payments 27,600 25,783
Net unrealized losses (gains) from derivative contracts (25,306) 3,309
Share-based compensation 11,620 5,975
Depreciation and amortization 69,762 41,999
Net amortization of discounts and premiums (16,648) 19,001
Net losses (gains) on financial instruments and other losses (gains), net (2,656) 5,581
Net gain on mortgage loans held for sale (25,803) (26,242)
Mortgage loans originated for sale (2,170,287) (2,093,860)
Proceeds from sale of mortgage loans held for sale 2,070,572 2,165,989
Capitalized mortgage servicing rights (24,821) (28,688)
Change in trading and fair value option securities (1,251,759) (848,409)
Change in receivables (613,872) (249,347)
Change in other assets 12,981 (15,157)
Change in accrued interest, taxes and expense (15,600) 66,697
Change in other liabilities 419,982 229,815
Net cash used in operating activities (1,056,518) (389,408)
Cash Flows From Investing Activities: [Abstract]    
Proceeds from maturities or redemptions of investment securities 49,621 89,099
Proceeds from maturities or redemptions of available for sale securities 1,267,190 1,208,373
Purchases of investment securities 0 (4,218)
Purchases of available for sale securities (3,802,635) (1,404,291)
Proceeds from sales of available for sale securities 628,385 232,826
Change in amount receivable on unsettled available for sale securities transactions 29,010 67,775
Loans originated, net of principal collected (590,196) (1,187,762)
Net payments on derivative asset contracts 40,922 (39,485)
Acquisitions, net of cash acquired 0 (13,870)
Proceeds from disposition of assets 127,476 265,786
Purchases of assets (308,630) (250,447)
Net cash used in investing activities (2,558,857) (1,036,214)
Cash Flows From Financing Activities: [Abstract]    
Net change in demand deposits, transaction deposits and savings accounts 773,152 (406,446)
Net change in time deposits 129,980 (22,570)
Net change in other borrowed funds 3,027,298 1,035,549
Net proceeds on derivative liability contracts (43,932) 42,883
Net change in derivative margin accounts (85,468) (46,390)
Change in amount due on unsettled available for sale securities transactions 111,828 (148,190)
Issuance of common and treasury stock, net (348) (310)
Repurchase of common stock (106,639) (8,408)
Dividends paid (107,332) (91,303)
Net cash provided by financing activities 3,698,539 354,815
Net increase (decrease) in cash and cash equivalents 83,164 (1,070,807)
Cash and cash equivalents at beginning of period 1,143,424 2,317,054
Cash and cash equivalents at end of period 1,226,588 1,246,247
Supplemental Cash Flow Information: [Abstract]    
Cash paid for interest 316,481 163,381
Cash paid for taxes 77,912 77,373
Net loans and bank premises transferred to repossessed real estate and other assets 8,489 9,513
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period 65,286 70,814
Conveyance of other real estate owned guaranteed by U.S. government agencies 22,449 32,206
Right-of-use assets obtained in exchange for operating lease liabilities $ 58,766 $ 0
v3.19.3
Significant Accounting Policies
 9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Significant Accounting Policies [Text Block]

Basis of Presentation

The accompanying unaudited consolidated financial statements of BOK Financial Corporation (“BOK Financial” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

The unaudited consolidated financial statements include accounts of BOK Financial and its subsidiaries, principally BOKF, NA (“the Bank”), BOK Financial Securities, Inc., and BOK Financial Private Wealth, Inc. Operating divisions of the Bank include Bank of Albuquerque, Bank of Oklahoma, Bank of Texas, BOK Financial in Arizona, Arkansas, Colorado and Kansas/Missouri, BOK Financial Mortgage and the TransFund electronic funds network.

Certain reclassifications have been made to conform to the current period presentation.

The financial information should be read in conjunction with BOK Financial’s 2018 Form 10-K filed with the Securities and Exchange Commission, which contains audited financial statements. Amounts presented as of December 31, 2018 have been derived from the audited financial statements included in BOK Financial’s 2018 Form 10-K but do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. Operating results for the nine-month period ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019.

Newly Adopted and Pending Accounting Policies

Financial Accounting Standards Board (“FASB”)

FASB Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02")

On February 25, 2016, the FASB issued ASU 2016-02 to increase transparency and comparability by recognizing lease assets and liabilities on the balance sheet and disclosing key information about leasing arrangements. Lessees are required to recognize an obligation for future lease payments measured on a discounted basis and a right-of-use asset. The Company adopted the new standard January 1, 2019 through a cumulative effect adjustment to retained earnings. Prior periods were not restated. BOKF elected to apply all practical expedients other than the lessee’s practical expedient to combine lease and non-lease components which would further gross up lease liability and the related right-of-use asset. The implementation of ASU 2016-02 increased the reported right-of-use asset and lease liability by $137 million. The effect on retained earnings was immaterial.

FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Assets Measured at Amortized Cost ("ASU 2016-13" or "CECL")

On June 16, 2016, the FASB issued ASU 2016-13 to provide more timely recording of credit losses on loans and other financial assets measured at amortized cost, effective for the Company's annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years.

The company has established a CECL implementation team to evaluate the impact to the Company’s financial statements. The CECL implementation team, overseen by the Chief Credit Officer, Chief Financial Officer and Chief Risk Officer, has developed a project plan that incorporates input from various departments within the bank including Credit, Financial Reporting, Risk and Information Technology among others. The Audit Committee and Credit Committee of the Board of Directors is periodically updated on project progress. In the second half of 2019, the implementation team is focused on design and operation of internal controls over the expected credit losses estimate and formalizing governance and approval processes. This includes finalizing model validation, refinement of model assumptions and qualitative framework, as well as drafting policies, reporting, and disclosures. These activities support our parallel runs and related results. The Company will adopt the standard on January 1, 2020 through a cumulative-effect adjustment to retained earnings.
FASB Accounting Standards Update No. 2019-01, Leases (Topic 842): Codification Improvements ("ASU 2019-01")

On March 5, 2019, the FASB issued ASU 2019-01 which amends certain aspects of leasing standard ASU 2016-02. ASU 2019-01 provides guidance for determining fair value of the underlying asset by lessors that are not manufacturers or dealers. The ASU also requires depository and lending lessors within the scope of ASC 942 to classify principal payments received from sales-type and direct financing leases within "investing activities" on the statement of cash flows. For the two issues above, the ASU is effective for the Company for fiscal years beginning after December 15, 2019, and interim periods therein; however early adoption is permitted. Additionally, ASU 2019-01 also clarifies interim disclosure requirements during transition and is effective with the original transition requirements in Topic 842. Adoption of ASU 2019-01 is not expected to have a material impact on the Company's financial statements.

FASB Accounting Standards Update No. 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments ("ASU 2019-04")

On April 25, 2019, the FASB issued ASU 2019-04 which clarifies certain aspects of the accounting for credit losses, hedging activities, and financial instruments addressed by ASUs 2016-13, 2017-12, and 2016-01, respectively. Significant amendments made to the provisions of ASU 2016-13 by ASU 2019-04 include providing certain alternatives for the measurement of the allowance for credit losses on accrued interest receivable and clarifying steps entities should take when recording the transfer of loans or debt securities between measurement classification or categories. ASU 2019-04 further clarifies the expectation that entities include recoveries of financial assets in the calculation of the current expected credit losses allowance for both pools of financial assets and individual financial assets. Significant amendments made to the provisions of ASU 2017-12 by ASU 2019-04 include clarification on partial-term fair value hedges of interest rate risk, amortization of fair value hedge basis adjustments and disclosure of fair value hedge basis adjustments. Significant amendments made to provisions of ASU 2016-01include clarification of the measurement alternative practice for equity securities and remeasurement of equity securities at historical exchange rates. ASU 2019-04 includes other amendments which clarify various provisions within the codification. ASU 2019-04 is effective for the Company for fiscal years beginning after December 15, 2019 and interim periods therein. Adoption of ASU 2019-04 is not expected to have a material impact on the Company's financial statements.

FASB Accounting Standards Update No. 2019-05, Financial Instruments-Credit Losses (Topic 326): Targeted Transition Relief ("ASU 2019-05")

On May 15, 2019, the FASB issued ASU 2019-05 which provides transition relief for entities adopting the Board's credit losses standard, ASU 2016-13. ASU 2019-05 amends ASU 2016-13 to allow companies to irrevocably elect, upon adoption of ASU 2016-13, the fair value option for financial instruments that meet specific requirements and is effective for the Company for annual reporting periods beginning after December 15, 2019. Adoption of ASU 2019-05 is not expected to have a material impact on the Company's financial statements.
v3.19.3
Securities
 9 Months Ended
Sep. 30, 2019
Marketable Securities [Abstract]  
Securities [Text Block] Securities
Trading Securities
 
The fair value and net unrealized gain (loss) included in trading securities are as follows (in thousands):
 
 
 
September 30, 2019
 
December 31, 2018
 
 
Fair Value
 
Net Unrealized Gain (Loss)
 
Fair Value
 
Net Unrealized Gain (Loss)
U.S. government agency debentures
 
$
63,334

 
$
23

 
$
63,765

 
$
254

Residential agency mortgage-backed securities
 
1,480,458

 
3,851

 
1,791,584

 
9,966

Municipal and other tax-exempt securities
 
44,105

 
(99
)
 
34,507

 
(1
)
Asset-backed securities
 
36,928

 
50

 
42,656

 
685

Other debt securities
 
50,387

 
116

 
24,411

 
65

Total trading securities
 
$
1,675,212

 
$
3,941

 
$
1,956,923

 
$
10,969


Investment Securities
 
The amortized cost and fair values of investment securities are as follows (in thousands):

 
 
September 30, 2019
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
Municipal and other tax-exempt
 
$
104,418

 
$
107,647

 
$
3,247

 
$
(18
)
Residential agency mortgage-backed securities
 
11,125

 
11,650

 
528

 
(3
)
Other debt securities
 
188,681

 
204,724

 
16,457

 
(414
)
Total investment securities
 
$
304,224

 
$
324,021

 
$
20,232

 
$
(435
)

 
 
December 31, 2018
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
Municipal and other tax-exempt
 
$
137,296

 
$
138,562

 
$
1,858

 
$
(592
)
Residential agency mortgage-backed securities
 
12,612

 
12,770

 
293

 
(135
)
Other debt securities
 
205,279

 
215,966

 
12,257

 
(1,570
)
Total investment securities
 
$
355,187

 
$
367,298

 
$
14,408

 
$
(2,297
)



The amortized cost and fair values of investment securities at September 30, 2019, by contractual maturity, are as shown in the following table (dollars in thousands):
 
 
Less than
One Year
 
One to
Five Years
 
Six to
Ten Years
 
Over
Ten Years
 
Total
 
Weighted
Average
Maturity1
Fixed maturity debt securities:
 
 

 
 

 
 

 
 

 
 

 
 
Amortized cost
 
$
42,266

 
$
93,139

 
$
145,046

 
$
12,648

 
$
293,099

 
5.16

Fair value
 
42,426

 
96,704

 
160,698

 
12,543

 
312,371

 
 

Residential mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 
 

Amortized cost
 
 

 
 

 
 

 
 

 
$
11,125

 
2 
Fair value
 
 

 
 

 
 

 
 

 
11,650

 
 

Total investment securities:
 
 

 
 

 
 

 
 

 
 

 
 

Amortized cost
 
 

 
 

 
 

 
 

 
$
304,224

 
 

Fair value
 
 

 
 

 
 

 
 

 
324,021

 
 

1 
Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
2 
The average expected lives of residential mortgage-backed securities were 4.5 years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities
(in thousands):
 
 
September 30, 2019
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Investment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal and other tax-exempt
 
18

 
$
10,302

 
$
3

 
$
2,213

 
$
15

 
$
12,515

 
$
18

Residential agency mortgage-backed securities
 
1

 
2,318

 
3

 
—

 
—

 
2,318

 
3

Other debt securities
 
18

 
275

 
1

 
10,897

 
413

 
11,172

 
414

Total investment securities
 
37

 
$
12,895

 
$
7

 
$
13,110

 
$
428

 
$
26,005

 
$
435


 
 
December 31, 2018
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Investment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal and other tax-exempt
 
72

 
$
18,255

 
$
69

 
$
66,141

 
$
523

 
$
84,396

 
$
592

Residential agency mortgage-backed securities
 
2

 
—

 
—

 
5,633

 
135

 
5,633

 
135

Other debt securities
 
72

 
13,372

 
64

 
23,028

 
1,506

 
36,400

 
1,570

Total investment securities
 
146

 
$
31,627

 
$
133

 
$
94,802

 
$
2,164

 
$
126,429

 
$
2,297




Available for Sale Securities 

The amortized cost and fair value of available for sale securities are as follows (in thousands):
 
 
September 30, 2019
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
U.S. Treasury
 
$
2,294

 
$
2,296

 
$
2

 
$
—

Municipal and other tax-exempt
 
1,772

 
1,848

 
76

 
—

Mortgage-backed securities:
 
 

 
 

 
 

 
 

Residential agency
 
7,636,923

 
7,740,461

 
114,646

 
(11,108
)
Residential non-agency
 
28,814

 
44,803

 
15,989

 
—

Commercial agency
 
3,176,188

 
3,234,671

 
61,003

 
(2,520
)
Other debt securities
 
500

 
472

 
—

 
(28
)
Total available for sale securities
 
$
10,846,491

 
$
11,024,551

 
$
191,716

 
$
(13,656
)

 
 
December 31, 2018
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
U.S. Treasury
 
$
496

 
$
493

 
$
—

 
$
(3
)
Municipal and other tax-exempt
 
2,782

 
2,864

 
82

 
—

Mortgage-backed securities:
 
 
 
 

 
 

 
 

Residential agency
 
5,886,323

 
5,804,708

 
16,149

 
(97,764
)
Residential non-agency
 
40,948

 
59,736

 
18,788

 
—

Commercial agency
 
2,986,297

 
2,953,889

 
7,955

 
(40,363
)
Other debt securities
 
35,545

 
35,430

 
12

 
(127
)
Total available for sale securities
 
$
8,952,391

 
$
8,857,120

 
$
42,986

 
$
(138,257
)


The amortized cost and fair values of available for sale securities at September 30, 2019, by contractual maturity, are as shown in the following table (dollars in thousands):
 
Less than
One Year
 
One to
Five Years
 
Six to
Ten Years
 
Over
Ten Years
 
Total
 
Weighted
Average
Maturity1
Fixed maturity debt securities:
 
 
 
 
 
 
 
 
 
 
 
Amortized cost
$
35,845

 
$
1,069,415

 
$
1,476,121

 
$
599,373

 
$
3,180,754

 
8.29

Fair value
35,806

 
1,081,571

 
1,512,308

 
609,602

 
3,239,287

 
 
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Amortized cost
 
 
 
 
 
 
 
 
$
7,665,737

 
2 
Fair value
 
 
 
 
 
 
 
 
7,785,264

 
 
Total available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
Amortized cost
 
 
 
 
 
 
 
 
$
10,846,491

 
 
Fair value
 
 
 
 
 
 
 
 
11,024,551

 
 
1 
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
2 
The average expected lives of residential mortgage-backed securities were 4.0 years based upon current prepayment assumptions.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Proceeds
$
261,028

 
$
45,293

 
$
628,385

 
$
232,826

Gross realized gains
989

 
250

 
7,316

 
700

Gross realized losses
(984
)
 
—

 
(6,206
)
 
(1,502
)
Related federal and state income tax expense (benefit)
1

 
64

 
282

 
(204
)


The fair value of debt securities pledged as collateral for repurchase agreements, public trust funds on deposit and for other purposes, as required by law was $10.8 billion at September 30, 2019 and $9.1 billion at December 31, 2018. The secured parties do not have the right to sell or repledge these securities.

Temporarily Impaired Available for Sale Securities
(in thousands)
 
 
September 30, 2019
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Available for sale:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury
 
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Mortgage-backed securities:
 
 
 
 

 
 

 
 

 
 

 


 


Residential agency
 
108


931,248


3,260


753,448


7,848


1,684,696


11,108

Commercial agency
 
57

 
449,798

 
1,612

 
224,409

 
908

 
674,207

 
2,520

Other debt securities
 
1

 
—

 
—

 
472

 
28

 
472

 
28

Total available for sale securities
 
166

 
$
1,381,046


$
4,872


$
978,329


$
8,784


$
2,359,375


$
13,656



 
 
December 31, 2018
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Available for sale:
 
 

 
 

 
 

 
 

 
 

 


 


U.S. Treasury
 
1

 
$
—

 
$
—

 
$
493

 
$
3

 
$
493

 
$
3

Mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 


 


Residential agency
 
289

 
510,824

 
1,158

 
3,641,370

 
96,606

 
4,152,194

 
97,764

Commercial agency
 
197

 
179,258

 
394

 
1,969,504

 
39,969

 
2,148,762

 
40,363

Other debt securities
 
3

 
9,982

 
63

 
20,436

 
64

 
30,418

 
127

Total available for sale securities
 
490

 
$
700,064


$
1,615


$
5,631,803


$
136,642


$
6,331,867


$
138,257



Based on evaluations of impaired securities as of September 30, 2019, the Company does not intend to sell any impaired available for sale debt securities before fair value recovers to the current amortized cost and it is more-likely-than-not that the Company will not be required to sell impaired securities before fair value recovers, which may be maturity.


Fair Value Option Securities
 
Fair value option securities represent securities which the Company has elected to carry at fair value and are separately identified on the Consolidated Balance Sheets. Changes in the fair value are recognized in earnings as they occur. Certain securities are held as an economic hedge of the mortgage servicing rights. 

The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands):
 
 
September 30, 2019
 
December 31, 2018
 
 
Fair Value
 
Net Unrealized Gain (Loss)
 
Fair Value
 
Net Unrealized Gain (Loss)
U.S. Treasury
 
$
552,536

 
$
927

 
$
—

 
$
—

Residential agency mortgage-backed securities
 
1,263,862

 
18,588

 
283,235

 
2,766

Total
 
$
1,816,398

 
$
19,515

 
$
283,235

 
$
2,766
v3.19.3
Derivatives
 9 Months Ended
Sep. 30, 2019
Derivative Instrument Detail [Abstract]  
Derivatives [Text Block] Derivatives
 
Derivative instruments may be used by the Company as part of its internal risk management programs or may be offered to customers. All derivative instruments are carried at fair value and changes in fair value are reported in earnings as they occur. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customer or other counterparties reduced the fair value of asset contracts. Deterioration of our credit rating could decrease the fair value of our derivative liabilities.

When bilateral netting agreements or similar arrangements exist between the Company and its counterparties that create a single legal claim or obligation to pay or receive the net amount in settlement of the individual derivative contracts, the Company reports derivative assets and liabilities on a net by derivative contract type by counterparty basis.

Derivative contracts may require the Company to provide or receive cash margin as collateral for derivative assets and liabilities. Derivative assets and liabilities are reported net of cash margin when certain conditions are met. In addition, derivative contracts executed with customers under Customer Risk Management Programs may be secured by non-cash collateral in conjunction with a credit agreement with that customer. Access to collateral in the event of default is reasonably assured.
 
None of these derivative contracts have been designated as hedging instruments for accounting purposes.

Customer Risk Management Programs
 
BOK Financial offers programs to permit its customers to manage various risks, including fluctuations in energy, cattle and other agricultural products, interest rates and foreign exchange rates with derivative contracts. Customers may also manage interest rate risk through interest rate swaps used by borrowers to modify interest rate terms of their loans. Derivative contracts are executed between the customers and BOK Financial. Offsetting contracts are executed between BOK Financial and other selected counterparties to minimize the risk of changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to BOK Financial as profit and compensation for administrative costs and credit risk which is recognized over the life of the contracts and included in Other operating revenue – Brokerage and trading revenue in the Consolidated Statements of Earnings.
 
Trading

BOK Financial may offer derivative instruments such as to-be-announced securities to mortgage banking customers to hedge their loan production or to mitigate the Company's market risk of holding trading securities. Changes in the fair value of derivative instruments for trading purposes or used to mitigate the market risk of holding trading securities are included in Other operating revenue – Brokerage and trading revenue.

Internal Risk Management Programs
 
BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change in the fair value of mortgage servicing rights and to mitigate the market risk of holding trading securities. Changes in the fair value of derivative instruments used in managing interest rate sensitivity and as part of the economic hedge of changes in the fair value of mortgage servicing rights are included in Other operating revenue – Gain (loss) on derivatives, net in the Consolidated Statements of Earnings.
As discussed in Note 6, certain derivative contracts not designated as hedging instruments related to mortgage loan commitments and forward sales contracts are included in Residential mortgage loans held for sale on the Consolidated Balance Sheets. See Note 6 for additional discussion of notional, fair value and impact on earnings of these contracts.
The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at September 30, 2019 (in thousands):
 
 
Assets
 
 
Notional1
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest rate swaps
 
2,399,788

 
67,157

 
(240
)
 
66,917

 
(277
)
 
66,640

Energy contracts
 
1,980,406

 
183,204

 
(59,139
)
 
124,065

 
(66,149
)
 
57,916

Agricultural contracts
 
15,538

 
470

 
(302
)
 
168

 
—

 
168

Foreign exchange contracts
 
209,515

 
206,914

 
—

 
206,914

 
—

 
206,914

Equity option contracts
 
82,860

 
3,114

 
—

 
3,114

 
(660
)
 
2,454

Total customer risk management programs
 
4,688,107

 
460,859

 
(59,681
)
 
401,178

 
(67,086
)
 
334,092

Trading
 
73,658,685

 
205,188

 
(193,306
)
 
11,882

 
—

 
11,882

Internal risk management programs
 
433,804

 
9,037

 
(2,992
)
 
6,045

 
—

 
6,045

Total derivative contracts
 
$
78,780,596

 
$
675,084

 
$
(255,979
)
 
$
419,105

 
$
(67,086
)
 
$
352,019

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
Notional¹
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest rate swaps
 
2,399,788

 
67,296

 
(240
)
 
67,056

 
(61,563
)
 
5,493

Energy contracts
 
1,936,369

 
175,613

 
(59,139
)
 
116,474

 
(784
)
 
115,690

Agricultural contracts
 
15,547

 
451

 
(302
)
 
149

 
—

 
149

Foreign exchange contracts
 
200,347

 
197,807

 
—

 
197,807

 
(433
)
 
197,374

Equity option contracts
 
82,860

 
3,114

 
—

 
3,114

 
—

 
3,114

Total customer risk management programs
 
4,634,911

 
444,281

 
(59,681
)
 
384,600

 
(62,780
)
 
321,820

Trading
 
75,247,769

 
207,542

 
(193,306
)
 
14,236

 
—

 
14,236

Internal risk management programs
 
483,370

 
5,435

 
(2,992
)
 
2,443

 
(1,708
)
 
735

Total derivative contracts
 
$
80,366,050

 
$
657,258

 
$
(255,979
)
 
$
401,279

 
$
(64,488
)
 
$
336,791

1 
Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.


The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2018 (in thousands):

 
 
Assets
 
 
Notional 1
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
10,671,151

 
$
92,231

 
$
(26,787
)
 
$
65,444

 
$
—

 
$
65,444

Interest rate swaps
 
1,924,131

 
36,112

 
(6,688
)
 
29,424

 
(7,934
)
 
21,490

Energy contracts
 
1,472,209

 
206,418

 
(60,983
)
 
145,435

 
(106,752
)
 
38,683

Agricultural contracts
 
21,210

 
842

 
(201
)
 
641

 
—

 
641

Foreign exchange contracts
 
184,990

 
183,759

 
—

 
183,759

 
—

 
183,759

Equity option contracts
 
89,085

 
2,021

 
—

 
2,021

 
(648
)
 
1,373

Total customer risk management programs
 
14,362,776

 
521,383

 
(94,659
)
 
426,724

 
(115,334
)
 
311,390

Trading
 
15,356,909

 
45,346

 
(39,521
)
 
5,825

 
—

 
5,825

Internal risk management programs
 
553,079

 
5,064

 
(1,350
)
 
3,714

 
—

 
3,714

Total derivative contracts
 
$
30,272,764

 
$
571,793

 
$
(135,530
)
 
$
436,263

 
$
(115,334
)
 
$
320,929

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
Notional 1
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
10,558,151

 
$
90,388

 
$
(26,787
)
 
$
63,601

 
$
(63,596
)
 
$
5

Interest rate swaps
 
1,924,131

 
36,288

 
(6,688
)
 
29,600

 
(4,110
)
 
25,490

Energy contracts
 
1,434,247

 
202,494

 
(60,983
)
 
141,511

 
(1,490
)
 
140,021

Agricultural contracts
 
21,214

 
812

 
(201
)
 
611

 
—

 
611

Foreign exchange contracts
 
177,423

 
175,922

 
—

 
175,922

 
—

 
175,922

Equity option contracts
 
89,085

 
2,021

 
—

 
2,021

 
—

 
2,021

Total customer risk management programs
 
14,204,251

 
507,925

 
(94,659
)
 
413,266

 
(69,196
)
 
344,070

Trading
 
19,374,294

 
56,983

 
(39,521
)
 
17,462

 
—

 
17,462

Internal risk management programs
 
260,348

 
9,439

 
(1,350
)
 
8,089

 
(7,315
)
 
774

Total derivative contracts
 
$
33,838,893

 
$
574,347

 
$
(135,530
)
 
$
438,817

 
$
(76,511
)
 
$
362,306

1 
Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.

The following summarizes the pre-tax net gains (losses) on derivative instruments and where they are recorded in the income statement (in thousands):
 
 
Three Months Ended
 
 
September 30, 2019
 
September 30, 2018
 
 
Brokerage
and Trading Revenue
 
Gain (Loss) on Derivatives, Net
 
Brokerage
and Trading
Revenue
 
Gain (Loss)on Derivatives, Net
Customer risk management programs:
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
1,667

 
$
—

 
$
7,272

 
$
—

Interest rate swaps
 
1,252

 
—

 
618

 
—

Energy contracts
 
1,611

 
—

 
541

 
—

Agricultural contracts
 
16

 
—

 
6

 
—

Foreign exchange contracts
 
138

 
—

 
78

 
—

Equity option contracts
 
—

 
—

 
—

 
—

Total customer risk management programs
 
4,684

 
—

 
8,515

 
—

Trading
 
3,630

 
—

 
6,124

 
—

Internal risk management programs
 
—

 
3,778

 
—

 
(2,847
)
Total derivative contracts
 
$
8,314

 
$
3,778

 
$
14,639

 
$
(2,847
)


 
 
Nine Months Ended
 
 
September 30, 2019
 
September 30, 2018
 
 
Brokerage
and Trading Revenue
 
Gain (Loss) on Derivatives, Net
 
Brokerage
and Trading
Revenue
 
Gain (Loss) on Derivatives, Net
Customer risk management programs:
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
9,579

 
$
—

 
$
21,677

 
$
—

Interest rate swaps
 
2,787

 
—

 
2,057

 
—

Energy contracts
 
3,923

 
—

 
5,097

 
—

Agricultural contracts
 
24

 
—

 
36

 
—

Foreign exchange contracts
 
392

 
—

 
350

 
—

Equity option contracts
 
—

 
—

 
—

 
—

Total customer risk management programs
 
16,705

 
—

 
29,217

 
—

Trading
 
4,365

 
—

 
3,260

 
—

Internal risk management programs
 
—

 
19,595

 
—

 
(11,589
)
Total derivative contracts
 
$
21,070

 
$
19,595

 
$
32,477

 
$
(11,589
)
v3.19.3
Loans and Allowances for Credit Losses
 9 Months Ended
Sep. 30, 2019
Loans and Leases Receivable, Net Amount [Abstract]  
Loans [Text Block] Loans and Allowances for Credit Losses

Loans

Loans are either secured or unsecured based on the type of loan and the financial condition of the borrower. Repayment is generally expected from cash flow or proceeds from the sale of selected assets of the borrower. BOK Financial is exposed to risk of loss on loans due to the borrower’s difficulties, which may arise from any number of factors, including problems within the respective industry or local economic conditions. Access to collateral, in the event of borrower default, is reasonably assured through adherence to applicable lending laws and through sound lending standards and credit review procedures. Accounting policies for all loans, excluding residential mortgage loans guaranteed by U.S. government agencies, are as follows.

Interest is accrued at the applicable interest rate on the principal amount outstanding. Loans are placed on nonaccruing status when, in the opinion of management, full collection of principal or interest is uncertain. Internally risk graded loans are individually evaluated for nonaccruing status quarterly. Non-risk graded loans are generally placed on nonaccruing status when more than 90 days past due or within 60 days of being notified of the borrower's bankruptcy filing. Interest previously accrued but not collected is charged against interest income when the loan is placed on nonaccruing status. Payments on nonaccruing loans are applied to principal or recognized as interest income, according to management’s judgment as to the collectability of principal. Loans may be returned to accruing status when, in the opinion of management, full collection of principal and interest, including principal previously charged off, is probable based on improvements in the borrower’s financial condition or a sustained period of performance.

Loans to borrowers experiencing financial difficulties may be modified in troubled debt restructurings ("TDRs"). Primarily all TDRs are classified as nonaccruing, excluding loans guaranteed by U.S. government agencies. Modifications generally consist of extension of payment terms or interest rate concessions and may result either voluntarily through negotiations with the borrower or involuntarily through court order. Generally, principal and accrued but unpaid interest is not voluntarily forgiven.

Performing loans may be renewed under the current collateral value, debt service ratio and other underwriting standards. Nonaccruing loans may be renewed and will remain classified as nonaccruing. 

Occasionally, loans, other than residential mortgage loans, may be held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains or losses recognized in other gains (losses), net in the Statements of Earnings.

All loans are charged off when the loan balance or a portion of the loan balance is no longer supported by the paying capacity of the borrower or when the required cash flow is reduced in a TDR. The charge-off amount is determined through a quarterly evaluation of available cash resources and collateral value and charge-offs are taken in the quarter in which the loss is identified. Non-risk graded loans that are past due between 60 days and 180 days, based on the loan product type, are charged off. Loans to borrowers whose personal obligation has been discharged through Chapter 7 bankruptcy proceedings are charged off within 60 days of notice of the bankruptcy filing, regardless of payment status.

Loan origination and commitment fees and direct loan acquisition and origination costs are deferred and amortized as an adjustment to yield over the life of the loan or over the commitment period, as applicable. Amortization does not anticipate loan prepayments. Net unamortized fees are recognized in full at time of payoff.

Qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. Under certain performance conditions specified in government programs, the Company may have the right, but not the obligation to repurchase loans from GNMA pools. These loans no longer qualify for sale accounting and are recognized in the Consolidated Balance Sheets. Guaranteed loans are considered impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. The original principal guarantee remains; however, interest accrues at a curtailed rate as specified in the programs. The carrying value of these loans is reduced based on an estimate of the expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in TDRs in accordance with U.S. government agency guidelines. Interest continues to accrue based on the modified rate. Guaranteed loans may either be resold into GNMA pools after a performance period specified by the programs or foreclosed and conveyed to the guarantors.

Loans are disaggregated into portfolio segments and further disaggregated into classes. The portfolio segment is the level at which the Company develops and documents a systematic method for determining its allowance for credit losses. Classes are a further disaggregation of portfolio segments based on the risk characteristics of the loans and the Company’s method for monitoring and assessing credit risk. 

Portfolio segments of the loan portfolio are as follows (in thousands):

 
 
September 30, 2019
 
December 31, 2018
 
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
Commercial
 
$
3,184,237

 
$
11,128,682

 
$
111,706

 
$
14,424,625

 
$
2,251,188

 
$
11,285,049

 
$
99,841

 
$
13,636,078

Commercial real estate
 
1,070,050

 
3,532,822

 
23,185

 
4,626,057

 
1,477,274

 
3,265,918

 
21,621

 
4,764,813

Residential mortgage
 
1,690,286

 
389,713

 
37,304

 
2,117,303

 
1,830,224

 
358,254

 
41,555

 
2,230,033

Personal
 
191,827

 
925,284

 
271

 
1,117,382

 
190,687

 
834,889

 
230

 
1,025,806

Total
 
$
6,136,400

 
$
15,976,501

 
$
172,466

 
$
22,285,367

 
$
5,749,373

 
$
15,744,110

 
$
163,247

 
$
21,656,730

Accruing loans past due (90 days)1
 
 

 
 

 
 

 
$
1,541

 
 

 
 

 
 

 
$
1,338

1 
Excludes residential mortgage loans guaranteed by agencies of the U.S. government
 
 
 
 
 
 
 
 
 


Credit Commitments
 
Commitments to extend credit are agreements to lend to a customer as long as there is no violation of conditions established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. At September 30, 2019, outstanding commitments totaled $11 billion. Because some commitments are expected to expire before being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. BOK Financial uses the same credit policies in making commitments as it does loans.

The amount of collateral obtained, if deemed necessary, is based upon management’s credit evaluation of the borrower.

Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Because the credit risk involved in issuing standby letters of credit is essentially the same as that involved in extending loan commitments, BOK Financial uses the same credit policies in evaluating the creditworthiness of the customer. Additionally, BOK Financial uses the same evaluation process in obtaining collateral on standby letters of credit as it does for loan commitments. The term of these standby letters of credit is defined in each commitment and typically corresponds with the underlying loan commitment. At September 30, 2019, outstanding standby letters of credit totaled $713 million. 

Allowances for Credit Losses

BOK Financial maintains an allowance for loan losses and an accrual for off-balance sheet credit risk. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees. As discussed in greater detail in Note 6, the Company also has separate accruals for off-balance sheet credit risk related to residential mortgage loans previously sold with full or partial recourse and for residential mortgage loans sold to government sponsored agencies under standard representations and warranties.

The appropriateness of the allowance for loan losses and accrual for off-balance sheet credit losses (collectively "allowance for credit losses") is assessed by management based on an ongoing quarterly evaluation of the probable estimated losses inherent in the portfolio, including probable losses on both outstanding loans and unused commitments.

The allowance for loan losses consists of specific allowances attributed to impaired loans that have not yet been charged down to amounts we expect to recover, general allowances for unimpaired loans based on estimated loss rates by loan class and nonspecific allowances based on general economic conditions, risk concentration and related factors. There have been no material changes in the approach or techniques utilized in developing the allowance for loan losses and the accrual for off-balance sheet credit losses for the three and nine months ended September 30, 2019.

Loans are considered to be impaired when it becomes probable that BOK Financial will be unable to collect all amounts due according to the contractual terms of the loan agreements. Internally risk graded loans are evaluated individually for impairment. Substantially all commercial and commercial real estate loans and certain residential mortgage and consumer loans are risk graded based on evaluation of the borrowers' ability to repay. Certain commercial loans and most residential mortgage and consumer loans are small balance, homogeneous pools of loans that are not risk graded. Non-risk graded loans are identified as impaired based on performance status. Generally, non-risk graded loans 90 days or more past due or modified in a TDR or in bankruptcy are considered to be impaired.

Specific allowances for impaired loans are measured by an evaluation of estimated future cash flows discounted at the loans’ initial effective interest rate or the fair value of collateral for certain collateral dependent loans. Collateral value of real property is generally based on third party appraisals that conform to Uniform Standards of Professional Appraisal Practice, less estimated selling costs. Appraised values are on an "as-is" basis and are generally not adjusted by the Company. Updated appraisals are obtained at least annually or more frequently if market conditions indicate collateral values have declined. Collateral value of mineral rights is generally determined by our internal staff of engineers based on projected cash flows under current market conditions. Collateral values and available cash resources that support impaired loans are evaluated quarterly. Historical statistics may be used as a practical way to estimate impairment in limited situations, such as when a collateral dependent loan is identified as impaired at the end of a reporting period, until an updated appraisal of collateral value is received or a full assessment of future cash flows is completed. Estimates of future cash flows and collateral values require significant judgments and may be volatile.

General allowances for unimpaired loans are based on estimated loss rates by loan class. The gross loss rate for each loan class is determined by the greater of the current gross loss rate based on the most recent twelve months or a long-term gross loss rate. Recoveries are not directly considered in the estimation of loss rates. Recoveries generally do not follow predictable patterns and are not received until well after the charge-off date as a result of protracted legal actions. For risk graded loans, gross loss rates are adjusted for changes in risk grading. For each loan class, the current weighted average risk grade is compared to the long-term average risk grade. This comparison determines whether credit risk in each loan class is increasing or decreasing. Loss rates are adjusted upward or downward in proportion to changes in average risk grading. General allowances for unimpaired loans also consider inherent risks identified for each loan class. Inherent risks consider loss rates that most appropriately represent the current credit cycle and other factors attributable to specific loan classes which have not yet been represented in the gross loss rates or risk grading. These factors include changes in commodity prices or engineering imprecision, which may affect the value of reserves that secure our energy loan portfolio, construction risk that may affect commercial real estate loans, changes in regulations and public policy that may disproportionately impact health care loans and changes in loan products.

Nonspecific allowances are maintained for risks beyond factors specific to a particular loan or loan class. These factors include trends in the economy of our primary lending areas, concentrations in large balance loans and other relevant factors.

An accrual for off-balance sheet credit losses is included in Other liabilities in the Consolidated Balance Sheets. The appropriateness of this accrual is determined in the same manner as the allowance for loan losses.

A provision for credit losses is charged against or credited to earnings in amounts necessary to maintain an appropriate allowance for credit losses. Recoveries of loans previously charged off are added to the allowance when received.

The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended September 30, 2019 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
106,397

 
$
54,188

 
$
15,724

 
$
9,388

 
$
16,837

 
$
202,534

Provision for loan losses
 
9,861

 
102

 
(253
)
 
1,911

 
918

 
12,539

Loans charged off
 
(9,875
)
 
—

 
(56
)
 
(1,776
)
 
—

 
(11,707
)
Recoveries
 
260

 
60

 
119

 
627

 
—

 
1,066

Ending balance
 
$
106,643

 
$
54,350

 
$
15,534

 
$
10,150

 
$
17,755

 
$
204,432

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
1,742

 
$
116

 
$
44

 
$
1

 
$
—

 
$
1,903

Provision for off-balance sheet credit losses
 
(536
)
 
(3
)
 
—

 
—

 
—

 
(539
)
Ending balance
 
$
1,206

 
$
113

 
$
44

 
$
1

 
$
—

 
$
1,364

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
9,325

 
$
99

 
$
(253
)
 
$
1,911

 
$
918

 
$
12,000



The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the nine months ended September 30, 2019 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
102,226

 
$
60,026

 
$
17,964

 
$
9,473

 
$
17,768

 
$
207,457

Provision for loan losses
 
34,740

 
(10,075
)
 
(2,660
)
 
3,434

 
(13
)
 
25,426

Loans charged off
 
(31,728
)
 
(118
)
 
(192
)
 
(4,671
)
 
—

 
(36,709
)
Recoveries
 
1,405

 
4,517

 
422

 
1,914

 
—

 
8,258

Ending balance
 
$
106,643

 
$
54,350

 
$
15,534

 
$
10,150

 
$
17,755

 
$
204,432

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
1,655

 
$
52

 
$
52

 
$
31

 
$
—

 
$
1,790

Provision for off-balance sheet credit losses
 
(449
)
 
61

 
(8
)
 
(30
)
 
—

 
(426
)
Ending balance
 
$
1,206

 
$
113

 
$
44

 
$
1

 
$
—

 
$
1,364

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
34,291

 
$
(10,014
)
 
$
(2,668
)
 
$
3,404

 
$
(13
)
 
$
25,000


The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended September 30, 2018 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
113,722

 
$
58,758

 
$
18,544

 
$
8,646

 
$
15,472

 
$
215,142

Provision for loan losses
 
(1,285
)
 
1,391

 
1

 
883

 
3,418

 
4,408

Loans charged off
 
(9,602
)
 
—

 
(91
)
 
(1,380
)
 
—

 
(11,073
)
Recoveries
 
1,263

 
40

 
229

 
560

 
—

 
2,092

Ending balance
 
$
104,098

 
$
60,189

 
$
18,683

 
$
8,709

 
$
18,890

 
$
210,569

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
2,361

 
17

 
53

 
2

 
—

 
$
2,433

Provision for off-balance sheet credit losses
 
(424
)
 
19

 
(3
)
 
—

 
—

 
(408
)
Ending balance
 
$
1,937

 
$
36

 
$
50

 
$
2

 
$
—

 
$
2,025

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
(1,709
)
 
$
1,410

 
$
(2
)
 
$
883

 
$
3,418

 
$
4,000



The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the nine months ended September 30, 2018 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
124,269

 
$
56,621

 
$
18,451

 
$
9,124

 
$
22,217

 
$
230,682

Provision for loan losses
 
2,720

 
248

 
(418
)
 
1,486

 
(3,327
)
 
709

Loans charged off
 
(24,940
)
 
—

 
(326
)
 
(3,802
)
 
—

 
(29,068
)
Recoveries
 
2,049

 
3,320

 
976

 
1,901

 
—

 
8,246

Ending balance
 
$
104,098

 
$
60,189

 
$
18,683

 
$
8,709

 
$
18,890

 
$
210,569

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
3,644

 
$
45

 
$
43

 
$
2

 
$
—

 
$
3,734

Provision for off-balance sheet credit losses
 
(1,707
)
 
(9
)
 
7

 
—

 
—

 
(1,709
)
Ending balance
 
$
1,937

 
$
36

 
$
50

 
$
2

 
$
—

 
$
2,025

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
1,013

 
$
239

 
$
(411
)
 
$
1,486

 
$
(3,327
)
 
$
(1,000
)

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at September 30, 2019 is as follows (in thousands):
 
 
Collectively Measured
for Impairment
 
Individually Measured
for Impairment
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
14,312,919

 
$
99,110

 
$
111,706

 
$
7,533

 
$
14,424,625

 
$
106,643

Commercial real estate
 
4,602,872

 
54,350

 
23,185

 
—

 
4,626,057

 
54,350

Residential mortgage
 
2,079,999

 
15,534

 
37,304

 
—

 
2,117,303

 
15,534

Personal
 
1,117,111

 
10,150

 
271

 
—

 
1,117,382

 
10,150

Total
 
22,112,901

 
179,144

 
172,466

 
7,533

 
22,285,367

 
186,677

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,755

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
22,112,901

 
$
179,144

 
$
172,466

 
$
7,533

 
$
22,285,367

 
$
204,432


The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2018 is as follows (in thousands):
 
 
Collectively Measured
for Impairment
 
Individually Measured
for Impairment
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,536,237

 
$
93,494

 
$
99,841

 
$
8,732

 
$
13,636,078

 
$
102,226

Commercial real estate
 
4,743,192

 
60,026

 
21,621

 
—

 
4,764,813

 
60,026

Residential mortgage
 
2,188,478

 
17,964

 
41,555

 
—

 
2,230,033

 
17,964

Personal
 
1,025,576

 
9,473

 
230

 
—

 
1,025,806

 
9,473

Total
 
21,493,483

 
180,957

 
163,247

 
8,732

 
21,656,730

 
189,689

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,768

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,493,483

 
$
180,957

 
$
163,247

 
$
8,732

 
$
21,656,730

 
$
207,457



 
 
 
 
 
 
 
 
 
 
 
 
 

Credit Quality Indicators

The Company utilizes loan class and risk grading as primary credit quality indicators. Substantially all commercial and commercial real estate loans and certain residential mortgage and consumer loans are risk graded based on a quarterly evaluation of the borrowers’ ability to repay the loans. Certain commercial loans and most residential mortgage and consumer loans are small, homogeneous pools that are not risk graded. 

The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at September 30, 2019 is as follows (in thousands):
 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
14,396,278

 
$
105,714

 
$
28,347

 
$
929

 
$
14,424,625

 
$
106,643

Commercial real estate
 
4,626,057

 
54,350

 
—

 
—

 
4,626,057

 
54,350

Residential mortgage
 
283,297

 
3,375

 
1,834,006

 
12,159

 
2,117,303

 
15,534

Personal
 
1,032,522

 
7,836

 
84,860

 
2,314

 
1,117,382

 
10,150

Total
 
20,338,154

 
171,275

 
1,947,213

 
15,402

 
22,285,367

 
186,677

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,755

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
20,338,154

 
$
171,275

 
$
1,947,213

 
$
15,402

 
$
22,285,367

 
$
204,432

 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2018 is as follows (in thousands):
 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,586,654

 
$
101,303

 
$
49,424

 
$
923

 
$
13,636,078

 
$
102,226

Commercial real estate
 
4,764,813

 
60,026

 
—

 
—

 
4,764,813

 
60,026

Residential mortgage
 
505,046

 
3,310

 
1,724,987

 
14,654

 
2,230,033

 
17,964

Personal
 
948,890

 
6,633

 
76,916

 
2,840

 
1,025,806

 
9,473

Total
 
19,805,403

 
171,272

 
1,851,327

 
18,417

 
21,656,730

 
189,689

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,768

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,805,403

 
$
171,272

 
$
1,851,327

 
$
18,417

 
$
21,656,730

 
$
207,457

 
 
 
 
 
 
 
 
 
 
 
 
 


Loans are considered to be performing if they are in compliance with the original terms of the agreement and currently exhibit no factors that cause management to have doubts about the borrowers' ability to remain in compliance with the original terms of the agreement, which is consistent with the regulatory guideline of “pass.” Performing loans also include past due residential mortgages that are guaranteed by agencies of the U.S. government that continue to accrue interest based on criteria of the guarantors' programs. Other loans especially mentioned are currently performing in compliance with the original terms of the agreement but may have a potential weakness that deserves management’s close attention, consistent with regulatory guidelines. 

The risk grading process identified certain loans that have a well-defined weakness (e.g. inadequate debt service coverage or liquidity or marginal capitalization; repayment may depend on collateral or other risk mitigation) that may jeopardize liquidation of the debt and represent a greater risk due to deterioration in the financial condition of the borrower. This is consistent with the regulatory guideline for “substandard.” Because the borrowers are still performing in accordance with the original terms of the loan agreements, these loans were not placed in nonaccruing status. 

Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This is substantially the same criteria used to determine whether a loan is impaired and includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines.

The following table summarizes the Company’s loan portfolio at September 30, 2019 by the risk grade categories (in thousands): 
 
 
Internally Risk Graded
 
Non-Graded
 
 
 
 
Performing
 
 
 
 
 
 
 
 
 
 
Pass
 
Other Loans Especially Mentioned
 
Accruing Substandard
 
Nonaccrual
 
Performing
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,927,285

 
$
60,405

 
$
37,685

 
$
88,894

 
$
—

 
$
—

 
$
4,114,269

Services
 
3,185,367

 
38,118

 
36,645

 
6,119

 
—

 
—

 
3,266,249

Wholesale/retail
 
1,829,614

 
9,757

 
7,742

 
1,504

 
—

 
—

 
1,848,617

Manufacturing
 
652,804

 
24,229

 
12,634

 
8,741

 
—

 
—

 
698,408

Healthcare
 
2,984,306

 
25,205

 
17,479

 
5,978

 
—

 
—

 
3,032,968

Public finance
 
744,840

 
—

 
—

 
—

 
—

 
—

 
744,840

Other commercial and industrial
 
671,819

 
2,053

 
16,632

 
423

 
28,300

 
47

 
719,274

Total commercial
 
13,996,035

 
159,767

 
128,817

 
111,659

 
28,300

 
47

 
14,424,625

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Residential construction and land development
 
135,011

 
—

 
—

 
350

 
—

 
—

 
135,361

Retail
 
765,708

 
12,067

 
1,262

 
20,132

 
—

 
—

 
799,169

Office
 
1,007,136

 
5,203

 
1,081

 
855

 
—

 
—

 
1,014,275

Multifamily
 
1,316,856

 
1,196

 
6,501

 
286

 
—

 
—

 
1,324,839

Industrial
 
872,627

 
—

 
—

 
909

 
—

 
—

 
873,536

Other commercial real estate
 
474,465

 
784

 
2,975

 
653

 
—

 
—

 
478,877

Total commercial real estate
 
4,571,803

 
19,250

 
11,819

 
23,185

 
—

 
—

 
4,626,057

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Permanent mortgage
 
280,243

 
326

 
2,191

 
537

 
763,535

 
19,628

 
1,066,460

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
185,432

 
6,332

 
191,764

Home equity
 
—

 
—

 
—

 
—

 
848,272

 
10,807

 
859,079

Total residential mortgage
 
280,243

 
326

 
2,191

 
537

 
1,797,239

 
36,767

 
2,117,303

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,032,381

 
46

 
33

 
63

 
84,651

 
208

 
1,117,382

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,880,462

 
$
179,389

 
$
142,860

 
$
135,444

 
$
1,910,190

 
$
37,022

 
$
22,285,367



The following table summarizes the Company’s loan portfolio at December 31, 2018 by the risk grade categories (in thousands): 
 
 
Internally Risk Graded
 
Non-Graded
 
 
 
 
Performing
 
 
 
 
 
 
 
 
 
 
Pass
 
Other Loans Especially Mentioned
 
Accruing Substandard
 
Nonaccrual
 
Performing
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,414,039

 
$
42,176

 
$
86,624

 
$
47,494

 
$
—

 
$
—

 
$
3,590,333

Services
 
3,167,203

 
49,761

 
32,661

 
8,567

 
—

 
—

 
3,258,192

Wholesale/retail
 
1,593,902

 
18,809

 
7,131

 
1,316

 
—

 
—

 
1,621,158

Manufacturing
 
668,438

 
30,934

 
22,230

 
8,919

 
—

 
—

 
730,521

Healthcare
 
2,730,121

 
14,920

 
37,698

 
16,538

 
—

 
—

 
2,799,277

Public finance
 
804,550

 
—

 
—

 
—

 
—

 
—

 
804,550

Other commercial and industrial
 
756,815

 
1,266

 
7,588

 
16,954

 
49,371

 
53

 
832,047

Total commercial
 
13,135,068

 
157,866

 
193,932

 
99,788

 
49,371

 
53

 
13,636,078

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Residential construction and land development
 
148,234

 
—

 
—

 
350

 
—

 
—

 
148,584

Retail
 
885,588

 
11,926

 
1,289

 
20,279

 
—

 
—

 
919,082

Office
 
1,059,334

 
10,532

 
3,054

 
—

 
—

 
—

 
1,072,920

Multifamily
 
1,287,471

 
281

 
12

 
301

 
—

 
—

 
1,288,065

Industrial
 
776,898

 
—

 
1,208

 
—

 
—

 
—

 
778,106

Other commercial real estate
 
555,301

 
1,188

 
876

 
691

 
—

 
—

 
558,056

Total commercial real estate
 
4,712,826

 
23,927

 
6,439

 
21,621

 
—

 
—

 
4,764,813

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Permanent mortgage
 
269,678

 
52

 
9,730

 
1,991

 
819,199

 
21,960

 
1,122,610

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
183,734

 
7,132

 
190,866

Home equity
 
223,298

 
—

 
296

 
—

 
682,491

 
10,472

 
916,557

Total residential mortgage
 
492,976

 
52

 
10,026

 
1,991

 
1,685,424

 
39,564

 
2,230,033

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
944,256

 
115

 
4,443

 
76

 
76,762

 
154

 
1,025,806

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,285,126

 
$
181,960

 
$
214,840

 
$
123,476

 
$
1,811,557

 
$
39,771

 
$
21,656,730


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 



Impaired Loans

Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreement. This generally includes all nonaccruing loans, all loans modified in a TDR and all loans repurchased from GNMA pools.

A summary of impaired loans at September 30, 2019 follows (in thousands):
 
As of
 
For the
 
For the
 
September 30, 2019
 
Three Months Ended
 
Nine Months Ended
 
 
 
Recorded Investment
 
 
 
September 30, 2019
 
September 30, 2019
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
 
Average Recorded
Investment
 
Interest Income Recognized
 
Average Recorded
Investment
 
Interest Income Recognized
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
$
139,897

 
$
88,894

 
$
62,981

 
$
25,913

 
$
7,176

 
$
80,263

 
$
—

 
$
67,705

 
$
—

Services
9,390

 
6,119

 
6,093

 
26

 
26

 
8,103

 
—

 
5,172

 
—

Wholesale/retail
1,718

 
1,504

 
1,243

 
261

 
101

 
1,447

 
—

 
1,087

 
—

Manufacturing1
9,153

 
8,741

 
8,511

 
230

 
230

 
8,677

 
—

 
8,448

 
—

Healthcare
17,786

 
5,978

 
5,978

 
—

 
—

 
11,063

 
—

 
8,547

 
—

Public finance
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
8,261

 
470

 
470

 
—

 
—

 
7,998

 
—

 
8,585

 
—

Total commercial
186,205

 
111,706

 
85,276

 
26,430

 
7,533

 
117,551

 
—

 
99,544

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Residential construction and land development
1,306

 
350

 
350

 
—

 
—

 
350

 
—

 
350

 
—

Retail
20,516

 
20,132

 
20,132

 
—

 
—

 
20,094

 
—

 
20,206

 
—

Office
855

 
855

 
855

 
—

 
—

 
855

 
—

 
427

 
—

Multifamily
286

 
286

 
286

 
—

 
—

 
281

 
—

 
294

 
—

Industrial
909

 
909

 
909

 
—

 
—

 
454

 
—

 
454

 
—

Other commercial real estate
813

 
653

 
653

 
—

 
—

 
393

 
—

 
672

 
—

Total commercial real estate
24,685

 
23,185

 
23,185

 
—

 
—

 
22,427

 
—

 
22,403

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Permanent mortgage
24,639

 
20,165

 
20,165

 
—

 
—

 
20,984

 
280

 
22,058

 
894

Permanent mortgage guaranteed by U.S. government agencies2
197,847

 
191,764

 
191,764

 
—

 
—

 
196,310

 
2,020

 
194,751

 
5,863

Home equity
12,621

 
10,807

 
10,807

 
—

 
—

 
10,369

 
—

 
10,639

 
—

Total residential mortgage
235,107

 
222,736

 
222,736

 
—

 
—

 
227,663

 
2,300

 
227,448

 
6,757

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
338

 
271

 
271

 
—

 
—

 
254

 
—

 
251

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
$
446,335

 
$
357,898

 
$
331,468

 
$
26,430

 
$
7,533

 
$
367,895

 
$
2,300

 
$
349,646

 
$
6,757

1 
Impaired manufacturing sector loans included $4.7 million of loans from an affiliated entity, with no allowance as the fair value of the collateral exceeded the outstanding principal balance at September 30, 2019.
2 All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At September 30, 2019, the majority were accruing based on the guarantee by U.S. government agencies.


Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, are recovered.

A summary of impaired loans at December 31, 2018 follows (in thousands): 
 
 
 
 
Recorded Investment
 
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
Commercial:
 
 
 
 
 
 
 
 
 
 
Energy
 
$
79,675

 
$
47,494

 
$
18,639

 
$
28,855

 
$
5,362

Services
 
13,437

 
8,567

 
8,489

 
78

 
74

Wholesale/retail
 
1,722

 
1,316

 
1,015

 
301

 
101

Manufacturing
 
10,055

 
8,919

 
8,673

 
246

 
246

Healthcare
 
24,319

 
16,538

 
10,563

 
5,975

 
2,949

Public finance
 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
 
26,955

 
17,007

 
17,007

 
—

 
—

Total commercial
 
156,163

 
99,841

 
64,386

 
35,455

 
8,732

 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 

 
 

 
 

Residential construction and land development
 
1,306

 
350

 
350

 
—

 
—

Retail
 
27,680

 
20,279

 
20,279

 
—

 
—

Office
 
—

 
—

 
—

 
—

 
—

Multifamily
 
301

 
301

 
301

 
—

 
—

Industrial
 
—

 
—

 
—

 
—

 
—

Other commercial real estate
 
851

 
691

 
691

 
—

 
—

Total commercial real estate
 
30,138

 
21,621

 
21,621

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 

 
 

 
 

Permanent mortgage
 
28,716

 
23,951

 
23,951

 
—

 
—

Permanent mortgage guaranteed by U.S. government agencies1
 
196,296

 
190,866

 
190,866

 
—

 
—

Home equity
 
12,196

 
10,472

 
10,472

 
—

 
—

Total residential mortgage
 
237,208

 
225,289

 
225,289

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
Personal
 
278

 
230

 
230

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
Total
 
$
423,787

 
$
346,981

 
$
311,526

 
$
35,455

 
$
8,732

1 
All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2018, the majority were accruing based on the guarantee by U.S. government agencies.



Troubled Debt Restructurings

At September 30, 2019 the Company had $145 million in troubled debt restructurings (TDRs), of which $93 million were accruing residential mortgage loans guaranteed by U.S. government agencies. Approximately $70 million of TDRs were performing in accordance with the modified terms.

At December 31, 2018, the Company had $166 million in TDRs, of which $86 million were accruing residential mortgage loans guaranteed by U.S. government agencies. Approximately $71 million of TDRs were performing in accordance with the modified terms.

TDRs generally consist of interest rate concessions, payment stream concessions or a combination of concessions to distressed borrowers. During the three and nine months ended September 30, 2019, $6.2 million and $40 million of loans were restructured. During the three and nine months ended September 30, 2018, $31 million and $76 million of loans were restructured.




Nonaccrual & Past Due Loans

Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans.

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of September 30, 2019 is as follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89 Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
4,025,375

 
$
—

 
$
—

 
$
—

 
$
88,894

 
$
4,114,269

Services
 
3,249,994

 
7,305

 
2,096

 
735

 
6,119

 
3,266,249

Wholesale/retail
 
1,844,203

 
2,910

 
—

 
—

 
1,504

 
1,848,617

Manufacturing
 
687,358

 
2,309

 
—

 
—

 
8,741

 
698,408

Healthcare
 
3,026,838

 
94

 
2

 
56

 
5,978

 
3,032,968

Public finance
 
744,840

 
—

 
—

 
—

 
—

 
744,840

Other commercial and industrial
 
718,419

 
337

 
48

 
—

 
470

 
719,274

Total commercial
 
14,297,027

 
12,955

 
2,146

 
791

 
111,706

 
14,424,625

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
134,947

 
—

 
—

 
64

 
350

 
135,361

Retail
 
779,037

 
—

 
—

 
—

 
20,132

 
799,169

Office
 
1,013,420

 
—

 
—

 
—

 
855

 
1,014,275

Multifamily
 
1,318,148

 
6,405

 
—

 
—

 
286

 
1,324,839

Industrial
 
872,627

 
—

 
—

 
—

 
909

 
873,536

Other commercial real estate
 
477,126

 
335

 
106

 
657

 
653

 
478,877

Total commercial real estate
 
4,595,305

 
6,740

 
106

 
721

 
23,185

 
4,626,057

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,036,793

 
6,097

 
3,405

 
—

 
20,165

 
1,066,460

Permanent mortgages guaranteed by U.S. government agencies
 
47,207

 
23,412

 
21,676

 
93,137

 
6,332

 
191,764

Home equity
 
845,616

 
2,282

 
374

 
—

 
10,807

 
859,079

Total residential mortgage
 
1,929,616

 
31,791

 
25,455

 
93,137

 
37,304

 
2,117,303

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,116,888

 
100

 
94

 
29

 
271

 
1,117,382

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,938,836

 
$
51,586

 
$
27,801

 
$
94,678

 
$
172,466

 
$
22,285,367


A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2018 is as follows (in thousands):

 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89 Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,542,839

 
$
—

 
$
—

 
$
—

 
$
47,494

 
$
3,590,333

Services
 
3,237,578

 
6,009

 
6,038

 
—

 
8,567

 
3,258,192

Wholesale/retail
 
1,619,290

 
515

 
37

 
—

 
1,316

 
1,621,158

Manufacturing
 
721,204

 
392

 
6

 
—

 
8,919

 
730,521

Healthcare
 
2,781,944

 
241

 
—

 
554

 
16,538

 
2,799,277

Public finance
 
804,550

 
—

 
—

 
—

 
—

 
804,550

Other commercial and industrial
 
814,489

 
518

 
25

 
8

 
17,007

 
832,047

Total commercial
 
13,521,894

 
7,675

 
6,106

 
562

 
99,841

 
13,636,078

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
147,705

 
249

 
280

 
—

 
350

 
148,584

Retail
 
884,424

 
14,379

 
—

 
—

 
20,279

 
919,082

Office
 
1,072,920

 
—

 
—

 
—

 
—

 
1,072,920

Multifamily
 
1,287,483

 
281

 
—

 
—

 
301

 
1,288,065

Industrial
 
776,898

 
1,208

 
—

 
—

 
—

 
778,106

Other commercial real estate
 
556,239

 
412

 
—

 
714

 
691

 
558,056

Total commercial real estate
 
4,725,669

 
16,529

 
280

 
714

 
21,621

 
4,764,813

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,095,097

 
3,196

 
366

 
—

 
23,951

 
1,122,610

Permanent mortgages guaranteed by U.S. government agencies
 
37,459

 
24,369

 
16,345

 
105,561

 
7,132

 
190,866

Home equity
 
904,572

 
1,102

 
352

 
59

 
10,472

 
916,557

Total residential mortgage
 
2,037,128

 
28,667

 
17,063

 
105,620

 
41,555

 
2,230,033

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,024,298

 
479

 
796

 
3

 
230

 
1,025,806

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,308,989

 
$
53,350

 
$
24,245

 
$
106,899

 
$
163,247

 
$
21,656,730
v3.19.3
Leasing Leasing
 9 Months Ended
Sep. 30, 2019
Leases [Abstract]  
Leases of Lessee Disclosure [Text Block] Leasing

Effective January 1, 2019, premises and equipment included right-of-use assets for leased office space and facilities. Leases are at market rates at inception and may contain escalations based on consumer price index or similar benchmarks and options to renew at then market rates. Renewal options, variable lease payments and residual value guarantees are included in the measurement of right-of-use assets when certain conditions are met. Lease component cash flows are discounted at the applicable FHLB advance rate.

At September 30, 2019, right-of-use assets were $180 million, the weighted-average remaining lease term was 11.0 years and the weighted average discount rate on operating leases was 3.2 percent. Operating lease costs recognized as occupancy and equipment expense were $7.1 million and $19.3 million for the three and nine months ended September 30, 2019. Operating cash flows from operating leases were $5.9 million and $17.3 million for the three and nine months ended September 30, 2019.

At September 30, 2019, un-discounted operating lease liabilities are scheduled to mature as follows: $7.0 million in 2019, $29.6 million in 2020, $27.4 million in 2021, $20.3 million in 2022, $18.6 million in 2023 and $136.3 million thereafter. Operating expense and short term lease costs total $3.3 million and $10.9 million for the three and nine months ended September 30, 2019.

The Company may lease owned properties or sublease unoccupied leased facilities. Income on these leases is immaterial.
v3.19.3
Mortgage Banking Activities
 9 Months Ended
Sep. 30, 2019
Mortgage Banking [Abstract]  
Mortgage Banking Activities [Text Block] Mortgage Banking Activities

Residential Mortgage Loan Production

The Company originates, markets and services conventional and government-sponsored residential mortgage loans. Generally, conforming fixed rate residential mortgage loans are held for sale in the secondary market and non-conforming and adjustable-rate residential mortgage loans are retained for investment. Residential mortgage loans originated for sale by the Company are carried at fair value based on sales commitments and market quotes. Changes in the fair value of mortgage loans held for sale are included in Other operating revenue – Mortgage banking revenue. Residential mortgage loans held for sale also includes the fair value of residential mortgage loan commitments and forward sales commitments, which are considered derivative contracts that have not been designated as hedging instruments for accounting purposes. The volume of mortgage loans originated for sale and secondary market prices are the primary drivers of originating and marketing revenue.

Residential mortgage loan commitments are generally outstanding for 60 to 90 days, which represents the typical period from commitment to originate a residential mortgage loan to when the closed loan is sold to an investor. Residential mortgage loan commitments are subject to both credit and interest rate risk. Credit risk is managed through underwriting policies and procedures, including collateral requirements, which are generally accepted by the secondary loan markets. Exposure to interest rate fluctuations is partially managed through forward sales of residential mortgage-backed securities and forward sales contracts. These latter contracts set the price for loans that will be delivered in the next 60 to 90 days.

The unpaid principal balance of residential mortgage loans held for sale, notional amounts of derivative contracts related to residential mortgage loan commitments and forward contract sales and their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands):
 
 
September 30, 2019
 
December 31, 2018
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
269,610

 
$
272,489

 
$
145,057

 
$
146,971

Residential mortgage loan commitments
 
379,377

 
10,111

 
160,848

 
5,378

Forward sales contracts
 
649,161

 
(113
)
 
274,000

 
(3,128
)
 
 
 

 
$
282,487

 
 

 
$
149,221



No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of September 30, 2019 or December 31, 2018. No credit losses were recognized on residential mortgage loans held for sale for the nine month period ended September 30, 2019 and 2018.

Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
8,971

 
$
9,063

 
$
24,838

 
$
28,699

Net change in unrealized gain on mortgage loans held for sale
 
97

 
(2,135
)
 
965

 
(2,457
)
Net change in the fair value of mortgage loan commitments
 
514

 
(2,446
)
 
4,733

 
(1,496
)
Net change in the fair value of forward sales contracts
 
4,232

 
2,768

 
3,015

 
1,871

Total production revenue
 
13,814

 
7,250

 
33,551

 
26,617

Servicing revenue
 
16,366

 
16,286

 
48,594

 
49,290

Total mortgage banking revenue
 
$
30,180

 
$
23,536

 
$
82,145

 
$
75,907



Production revenue includes gain (loss) on residential mortgage loans held for sale and changes in the fair value of derivative contracts not designated as hedging instruments for accounting purposes related to residential mortgage loan commitments and forward sales contracts. Servicing revenue includes servicing fee income and late charges on loans serviced for others.

Residential Mortgage Servicing

Mortgage servicing rights may be originated or purchased. Both originated and purchased mortgage servicing rights are initially recognized at fair value. The Company has elected to carry all mortgage servicing rights at fair value. Changes in the fair value are recognized in earnings as they occur. The unpaid principal balance of loans serviced for others is the primary driver of servicing revenue.

The following represents a summary of mortgage servicing rights (dollars in thousands):
 
 
September 30, 2019
 
December 31, 2018
Number of residential mortgage loans serviced for others
 
128,463

 
132,463

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,046,136

 
$
21,658,335

Weighted average interest rate
 
3.99
%
 
3.99
%
Remaining term (in months)
 
290

 
293



The following represents activity in capitalized mortgage servicing rights (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Beginning Balance
 
$
208,308

 
$
278,719

 
$
259,254

 
$
252,867

Additions, net
 
9,882

 
8,968

 
24,821

 
28,688

Change in fair value due to principal payments
 
(11,936
)
 
(8,986
)
 
(27,600
)
 
(25,783
)
Change in fair value due to market assumption changes
 
(12,593
)
 
5,972

 
(62,814
)
 
28,901

Ending Balance
 
$
193,661

 
$
284,673

 
$
193,661

 
$
284,673


Changes in the fair value of mortgage servicing rights due to market assumption changes are included in Other operating revenue in the Consolidated Statements of Earnings. Changes in fair value due to principal payments are included in Mortgage banking costs. 

Mortgage servicing rights are not traded in active markets. Fair value is determined by discounting the projected net cash flows. Significant market assumptions used to determine fair value based on significant unobservable inputs were as follows:
 
 
September 30, 2019
 
December 31, 2018
Discount rate – risk-free rate plus a market premium
 
9.82%
 
9.90%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.31% - 17.22%
 
8.05% - 15.74%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$68 - $94
 
$67 - $93
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$1,000 - $4,000
 
$1,000 - $4,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.51%
 
2.57%
Primary/secondary mortgage rate spread
 
102 bps
 
105 bps


Changes in primary residential mortgage interest rates directly affect the prepayment speeds used in valuing our mortgage servicing rights. A separate third party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults and other relevant factors. The prepayment model is updated periodically for changes in market conditions and adjusted to better correlate with actual performance of BOK Financial’s servicing portfolio.
v3.19.3
Commitments and Contingent Liabilities
 9 Months Ended
Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingent Liabilities [Text Block] Commitments and Contingent Liabilities

Litigation Contingencies

On June 24, 2015, BOKF, NA received a complaint alleging that an employee had colluded with a bond issuer and an individual in misusing revenues pledged to municipal bonds for which BOKF, NA served as trustee under the bond indenture. The Company conducted an investigation and concluded that employees in one of its Corporate Trust offices had, with respect to a single group of affiliated bond issuances, violated Company policies and procedures by waiving financial covenants, granting forbearances and accepting without disclosure to the bondholders, debt service payments from sources other than pledged revenues. The relationship manager was terminated. The Company reported the circumstances to, and cooperated with an investigation by, the Securities and Exchange Commission ("SEC").

On December 28, 2015, in an action brought by the SEC, the United States District Court for the District of New Jersey entered a judgment against the principals involved in issuing the bonds, precluding the principals from denying the alleged violations of the federal securities laws and requiring the principals to pay all outstanding principal, accrued interest, and other amounts required under the bond documents, less the value of the facilities securing repayment of the bonds), subject to oversight by a court appointed monitor (“Payment Plan”).

On September 7, 2016, BOKF, NA agreed, and the SEC entered, a consent order finding that BOKF, NA had violated Section 17(a) of the Securities Act of 1933 and Section 10(b) of the Securities Exchange Act and requiring BOKF, NA to disgorge
$1,067,721 of fees and pay a civil penalty of $600,000. BOKF, NA disgorged the fees and paid the penalty.

On August 26, 2016, BOKF, NA was sued in the United States District Court for New Jersey by two bondholders in a putative class action on behalf of all holders of the bonds alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The New Jersey Federal District Action has been stayed until December 17, 2019. On September 14, 2016, BOKF, NA was sued in the District Court of Tulsa County, Oklahoma by 19 bondholders alleging BOKF, NA participated in the fraudulent sale of securities by the principals. The Tulsa County District Court Action is pending on BOKF, NA’s motion to dismiss. Four separate small groups of bondholders filed arbitration complaints with the Financial Institutions Regulatory Association respecting the bonds and other bonds for which BOKF, NA served as indenture trustee. BOKF, NA challenged the FINRA proceedings in the United States District Court of Nevada. On appeal, the United States Court of Appeals for the Ninth Circuit held BOKF, NA was not subject to FINRA jurisdiction. The four FINRA complaints were then dismissed.

On July 9, 2019, the New Jersey Federal District Court, upon motion of the SEC, terminated the Payment Plan except with respect to facilities then under contract to be sold. The SEC has announced its intention to seek judgment against the principal individual and his wife for the amount remaining on the bonds. As a result, management is no longer able to conclude that the individual principal and his wife will be successful in paying the obligations he has to pay the bonds in full. Management has been advised by counsel that BOKF, NA has valid defenses to claims of bondholders and that no loss to the company is probable. No provision for losses has been made at this time. BOKF, NA estimates that upon sale of all facilities securing payment of the bonds, including those currently under contract and those not currently under contract, approximately $20 million will remain outstanding. BOKF, NA is unable at this time to assess whether the individual principal and his wife will have the financial capacity to pay in full the balance due on the bonds. If the individual principal and his wife do not have the financial ability to pay the bonds in full, a bondholder loss could become probable. Under all circumstances, the obligation of the principals to repay the bonds continues as an obligation not dischargeable in bankruptcy. A reasonable estimate cannot be made of the amount of any bondholder loss, though the amount of bondholder loss could be material to the company in the event a loss to the company becomes probable.
 
On March 5, 2018, BOKF, NA was sued in the Fulton, Georgia County District Court by the administratrix of a deceased resident who had sued for and obtained a judgment for wrongful death against one of the operators of a nursing home financed by one of the bonds which are the subject of the litigation discussed above. The judgment is alleged to total approximately $8 million in principal and interest at this time. Plaintiff alleges that BOKF, in its capacity as indenture trustee for the bonds, colluded with the borrower and others to defraud creditors of the nursing home by misleading the public about the solvency of the nursing home. Plaintiff alleges that this conduct has prevented her from collecting on her judgment. BOKF, NA is advised by counsel that BOKF, NA has valid defenses to the plaintiffs’ claims and no loss is probable.

On March 14, 2017, BOKF, NA was sued in the United States District Court for the Northern District of Oklahoma by bondholders in a second putative class action representing a different set of municipal securities. The bondholders in this second action allege two individuals purchased facilities from the principals who are the subject of the SEC New Jersey proceedings by means of the fraudulent sale of $60 million of municipal securities for which BOKF, NA also served as indenture trustee. The bondholders allege BOKF, NA failed to disclose that the seller of the purchased facilities had engaged in the conduct complained of in the New Jersey action. BOKF, NA properly performed all duties as indenture trustee of this second set of municipal securities, timely commenced proceedings against the issuer of the securities when default occurred, is cooperating with the SEC in actions against the two principals, is not a target of the SEC proceedings, and has been advised by counsel that BOKF, NA has valid defenses to the claims of these bondholders. Management is advised by counsel that a loss is not probable and that the loss, if any, cannot be reasonably estimated.

On March 7, 2017, a plaintiff filed a putative class action in the United States District Court for the Northern District of Texas alleging an extended overdraft fee charged by BOKF, NA is interest and exceeds permitted rates. On September 18, 2018, the District Court dismissed the Texas action and the plaintiff appealed the dismissal to the United States Court of Appeals for the Fifth Circuit which heard argument on October 8, 2019. On August 22, 2018, a plaintiff filed a second putative class action in the United States District Court for New Mexico making the same allegations as the Texas action. Management is advised by counsel that a loss is not probable in either the now dismissed Texas action or the New Mexico action and that the loss, if any, cannot be reasonably estimated.

On July 6, 2018, a plaintiff served a petition in a putative class action in the Oklahoma District Court for Tulsa County Oklahoma alleging BOKF NA breached its Demand Deposit Agreements by charging overdraft and not sufficient funds fees to deposit accounts on the day of the transaction triggering the fee and by the bank's debit hold process causing overdraft fees. Management is advised by counsel that a loss is not probable and that the loss, if any, cannot be reasonably estimated.

In the ordinary course of business, BOK Financial and its subsidiaries are subject to legal actions and complaints. Management believes, based upon the opinion of counsel, that the actions and liability or loss, if any, resulting from the final outcomes of the proceedings, will not have a material effect on the Company’s financial condition, results of operations or cash flows.

Alternative Investment Commitments

The Company sponsors two private equity funds and invests in several tax credit entities and other funds as permitted by banking regulations. Consolidation of these investments is based on the variable interest model.

At September 30, 2019, the Company has $245 million in interests in various alternative investments generally consisting of unconsolidated limited partnership interests in entities for which investment return is in the form of low income housing tax credits or other investments in merchant banking activities. This investment balance also includes $70 million of unfunded commitments included in Other liabilities on the Consolidated Balance Sheets.
v3.19.3
Shareholders' Equity
 9 Months Ended
Sep. 30, 2019
Stockholders' Equity Note [Abstract]  
Shareholders' Equity [Text Block] Shareholders' Equity

On October 29, 2019, the Company declared a quarterly cash dividend of $0.51 per common share payable on or about November 27, 2019 to shareholders of record as of November 12, 2019.

Dividends declared were $0.50 and $1.50 per share during the three and nine months ended September 30, 2019 and $0.50 and $1.40 per share during the three and nine months ended September 30, 2018.

Accumulated Other Comprehensive Income (Loss)

AOCI includes unrealized gains and losses on available for sale ("AFS") securities and non-credit related unrealized losses on AFS securities for which an other-than-temporary impairment has been recorded in earnings. Unrealized losses on employee benefit plans will be reclassified into income as pension plan costs are recognized over the remaining service period of plan participants. Gains and losses in AOCI are net of deferred income taxes.

A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
 
 
Unrealized Gain (Loss) on
 
 
 
 
Available for Sale Securities
 
Employee Benefit Plans
 
Total
Balance, December 31, 2017
 
$
(35,385
)
 
$
(789
)
 
$
(36,174
)
Transition adjustment for net unrealized gains on equity securities
 
(2,709
)
 
—

 
(2,709
)
Net change in unrealized gain (loss)
 
(166,464
)
 
—

 
(166,464
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
802

 
—

 
802

Other comprehensive loss, before income taxes
 
(165,662
)
 
—

 
(165,662
)
Federal and state income taxes1
 
(42,183
)
 
—

 
(42,183
)
Other comprehensive loss, net of income taxes
 
(123,479
)
 
—

 
(123,479
)
Balance, September 30, 2018
 
$
(161,573
)
 
$
(789
)
 
$
(162,362
)
 
 
 
 
 
 

Balance, December 31, 2018
 
$
(70,999
)
 
$
(1,586
)
 
$
(72,585
)
Net change in unrealized gain (loss)
 
274,441

 
—

 
274,441

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(1,110
)
 
—

 
(1,110
)
Other comprehensive income, before income taxes
 
273,331

 
—

 
273,331

Federal and state income taxes1
 
66,993

 
—

 
66,993

Other comprehensive income, net of income taxes
 
206,338

 
—

 
206,338

Balance, September 30, 2019
 
$
135,339


$
(1,586
)
 
$
133,753


1 
Calculated using a 25 percent blended federal and state statutory tax rate.
v3.19.3
Earnings Per Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block] Earnings Per Share
 
(In thousands, except share and per share amounts)
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
 
Net income attributable to BOK Financial Corp. shareholders
 
$
142,231

 
$
117,256

 
$
390,406

 
$
337,190

Less: Earnings allocated to participating securities
 
875

 
963

 
2,553

 
2,940

Numerator for basic earnings per share – income available to common shareholders
 
141,356

 
116,293

 
387,853

 
334,250

Effect of reallocating undistributed earnings of participating securities
 
1

 
1

 
1

 
1

Numerator for diluted earnings per share – income available to common shareholders
 
$
141,357

 
$
116,294

 
$
387,854

 
$
334,251

 
 
 
 
 
 
 
 
 
Denominator:
 
 

 
 

 
 

 
 

Weighted average shares outstanding
 
71,033,405

 
65,438,849

 
71,425,855

 
65,455,306

Less:  Participating securities included in weighted average shares outstanding
 
437,098

 
537,754

 
472,311

 
571,987

Denominator for basic earnings per common share
 
70,596,307

 
64,901,095

 
70,953,544

 
64,883,319

Dilutive effect of employee stock compensation plans1
 
13,617

 
33,256

 
15,301

 
36,409

Denominator for diluted earnings per common share
 
70,609,924

 
64,934,351

 
70,968,845

 
64,919,728

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
2.00

 
$
1.79

 
$
5.47

 
$
5.15

Diluted earnings per share
 
$
2.00

 
$
1.79

 
$
5.47

 
$
5.15

1  Excludes employee stock options with exercise prices greater than current market price.
 
—

 
—

 
—

 
—
v3.19.3
Reportable Segments
 9 Months Ended
Sep. 30, 2019
Segment Reporting [Abstract]  
Reportable Segments [Text Block] Reportable Segments

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended September 30, 2019 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
243,944

 
$
27,580

 
$
12,343

 
$
(4,771
)
 
$
279,096

Net interest revenue (expense) from internal sources
 
(63,797
)
 
20,882

 
10,723

 
32,192

 
—

Net interest revenue
 
180,147

 
48,462

 
23,066

 
27,421

 
279,096

Provision for credit losses
 
9,505

 
1,841

 
(42
)
 
696

 
12,000

Net interest revenue after provision for credit losses
 
170,642

 
46,621

 
23,108

 
26,725

 
267,096

Other operating revenue
 
48,832

 
51,221

 
89,160

 
(2,763
)
 
186,450

Other operating expense
 
68,685

 
59,699

 
71,619

 
79,289

 
279,292

Net direct contribution
 
150,789

 
38,143

 
40,649

 
(55,327
)
 
174,254

Gain on financial instruments, net
 
28

 
8,339

 
—

 
(8,367
)
 
—

Change in fair value of mortgage servicing rights
 
—

 
(12,593
)
 
—

 
12,593

 
—

Gain on repossessed assets, net
 
802

 
214

 
—

 
(1,016
)
 
—

Corporate expense allocations
 
12,613

 
11,776

 
9,416

 
(33,805
)
 
—

Net income before taxes
 
139,006

 
22,327

 
31,233

 
(18,312
)
 
174,254

Federal and state income taxes
 
37,433

 
5,687

 
8,027

 
(18,751
)
 
32,396

Net income
 
101,573

 
16,640

 
23,206

 
439

 
141,858

Net income (loss) attributable to non-controlling interests
 
—

 
—

 
—

 
(373
)
 
(373
)
Net income attributable to BOK Financial Corp. shareholders
 
$
101,573

 
$
16,640

 
$
23,206

 
$
812

 
$
142,231

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
23,973,067

 
$
9,827,130

 
$
10,392,988

 
$
(611,075
)
 
$
43,582,110





Reportable segments reconciliation to the Consolidated Financial Statements for the nine months ended September 30, 2019 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other1
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
699,239

 
$
75,353

 
$
51,054

 
$
16,984

 
$
842,630

Net interest revenue (expense) from internal sources
 
(181,829
)
 
76,925

 
27,213

 
77,691

 
—

Net interest revenue
 
517,410

 
152,278

 
78,267

 
94,675

 
842,630

Provision for credit losses
 
27,574

 
4,654

 
(209
)
 
(7,019
)
 
25,000

Net interest revenue after provision for credit losses
 
489,836

 
147,624

 
78,476

 
101,694

 
817,630

Other operating revenue
 
128,055

 
142,780

 
248,591

 
(3,641
)
 
515,785

Other operating expense
 
181,809

 
171,214

 
202,579

 
287,984

 
843,586

Net direct contribution
 
436,082

 
119,190

 
124,488

 
(189,931
)
 
489,829

Gain on financial instruments, net
 
67

 
43,416

 
—

 
(43,483
)
 
—

Change in fair value of mortgage servicing rights
 
—

 
(62,814
)
 
—

 
62,814

 
—

Gain on repossessed assets, net
 
455

 
409

 
—

 
(864
)
 
—

Corporate expense allocations
 
34,146

 
35,369

 
26,943

 
(96,458
)
 
—

Net income before taxes
 
402,458

 
64,832

 
97,545

 
(75,006
)
 
489,829

Federal and state income taxes
 
107,807

 
16,513

 
25,076

 
(49,470
)
 
99,926

Net income
 
294,651

 
48,319

 
72,469

 
(25,536
)
 
389,903

Net income (loss) attributable to non-controlling interests
 
—

 
—

 
—

 
(503
)
 
(503
)
Net income attributable to BOK Financial Corp. shareholders
 
$
294,651

 
$
48,319

 
$
72,469

 
$
(25,033
)
 
$
390,406

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
22,288,129

 
$
9,142,491

 
$
9,861,021

 
$
89,202

 
$
41,380,843

1 
CoBiz operations are included in Funds Management and Other for the first quarter of 2019 and subsequently allocated to the respective segments in the second quarter of 2019.

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended September 30, 2018 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
187,417

 
$
20,005

 
$
22,509

 
$
10,952

 
$
240,883

Net interest revenue (expense) from internal sources
 
(42,270
)
 
19,039

 
6,267

 
16,964

 
—

Net interest revenue
 
145,147

 
39,044

 
28,776

 
27,916

 
240,883

Provision for credit losses
 
8,047

 
1,451

 
(84
)
 
(5,414
)
 
4,000

Net interest revenue after provision for credit losses
 
137,100

 
37,593

 
28,860

 
33,330

 
236,883

Other operating revenue
 
40,522

 
44,024

 
83,357

 
38

 
167,941

Other operating expense
 
51,039

 
58,482

 
62,256

 
80,840

 
252,617

Net direct contribution
 
126,583

 
23,135

 
49,961

 
(47,472
)
 
152,207

Gain (loss) on financial instruments, net
 
(3
)
 
(7,229
)
 
7

 
7,225

 
—

Change in fair value of mortgage servicing rights
 
—

 
5,972

 
—

 
(5,972
)
 
—

Gain (loss) on repossessed assets, net
 
(1,869
)
 
(87
)
 
—

 
1,956

 
—

Corporate expense allocations
 
9,124

 
11,037

 
11,127

 
(31,288
)
 
—

Net income before taxes
 
115,587

 
10,754

 
38,841

 
(12,975
)
 
152,207

Federal and state income taxes
 
30,623

 
2,739

 
9,975

 
(8,675
)
 
34,662

Net income
 
84,964

 
8,015

 
28,866

 
(4,300
)
 
117,545

Net income attributable to non-controlling interests
 
—

 
—

 
—

 
289

 
289

Net income (loss) attributable to BOK Financial Corp. shareholders
 
$
84,964

 
$
8,015

 
$
28,866

 
$
(4,589
)
 
$
117,256

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
18,499,979

 
$
8,323,543

 
$
8,498,363

 
$
(1,626,068
)
 
$
33,695,817



Reportable segments reconciliation to the Consolidated Financial Statements for the nine months ended September 30, 2018 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
529,958

 
$
63,504

 
$
56,990

 
$
48,729

 
$
699,181

Net interest revenue (expense) from internal sources
 
(107,715
)
 
51,811

 
26,431

 
29,473

 
—

Net interest revenue
 
422,243

 
115,315

 
83,421

 
78,202

 
699,181

Provision for credit losses
 
18,781

 
3,890

 
(238
)
 
(23,433
)
 
(1,000
)
Net interest revenue after provision for credit losses
 
403,462

 
111,425

 
83,659

 
101,635

 
700,181

Other operating revenue
 
123,245

 
135,291

 
228,766

 
(6,973
)
 
480,329

Other operating expense
 
148,796

 
174,728

 
188,691

 
231,308

 
743,523

Net direct contribution
 
377,911

 
71,988

 
123,734

 
(136,646
)
 
436,987

Gain (loss) on financial instruments, net
 
13

 
(36,901
)
 
7

 
36,881

 
—

Change in fair value of mortgage servicing rights
 
—

 
28,901

 
—

 
(28,901
)
 
—

Gain (loss) on repossessed assets, net
 
(6,102
)
 
(21
)
 
—

 
6,123

 
—

Corporate expense allocations
 
29,092

 
33,283

 
31,084

 
(93,459
)
 
—

Net income before taxes
 
342,730

 
30,684

 
92,657

 
(29,084
)
 
436,987

Federal and state income taxes
 
90,943

 
7,816

 
23,824

 
(23,643
)
 
98,940

Net income
 
251,787

 
22,868

 
68,833

 
(5,441
)
 
338,047

Net income attributable to non-controlling interests
 
—

 
—

 
—

 
857

 
857

Net income attributable to BOK Financial Corp. shareholders
 
$
251,787

 
$
22,868

 
$
68,833

 
$
(6,298
)
 
$
337,190

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
18,124,571

 
$
8,381,205

 
$
8,364,712

 
$
(1,094,993
)
 
$
33,775,495
v3.19.3
Fees and Commissions Revenue Fees and Commissions Revenue
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Fees and Commissions Revenue [Text Block] Fees and Commissions Revenue

Fees and commissions revenue is generated through the sales of products, consisting primarily of financial instruments, and the performance of services for customers under contractual obligations. Revenue from providing services for customers is recognized at the time services are provided in an amount that reflects the consideration we expect to be entitled to for those services. Revenue is recognized based on the application of five steps:
•
Identify the contract with a customer
•
Identify the performance obligations in the contract
•
Determine the transaction price
•
Allocate the transaction price to the performance obligations in the contract
•
Recognize revenue when (or as) the Company satisfies a performance obligation

For contracts with multiple performance obligations, individual performance obligations are accounted for separately if the customer can benefit from the good or service on its own or with other resources readily available to the customer and the promise to transfer goods and services to the customer is separately identifiable in the contract. The transaction price is allocated to the performance obligations based on relative standalone selling prices.

Revenue is recognized on a gross basis whenever we have primary responsibility and risk in providing the services or products to our customers and have discretion in establishing the price for the services or products. Revenue is recognized on a net basis whenever we act as an agent for products or services of others. 
 
Brokerage and trading revenue includes revenues from trading, customer hedging, retail brokerage and investment banking. Trading revenue includes net realized and unrealized gains primarily related to sales of securities to institutional customers and related derivative contracts. Customer hedging revenue includes realized and unrealized changes in the fair value of derivative contracts held for customer risk management programs including credit valuation adjustments, as necessary. We offer commodity, interest rate, foreign exchange and equity derivatives to our customers. These customer contracts are offset with contracts with selected counterparties and exchanges to minimize changes in market risk from changes in commodity prices, interest rates or foreign exchange rates. Retail brokerage revenue represents fees and commissions earned on sales of fixed income securities, annuities, mutual funds and other financial instruments to retail customers. Investment banking revenue includes fees earned upon completion of underwriting and financial advisory services. Investment banking revenue also includes fees earned in conjunction with loan syndications. Insurance brokerage revenues represents fees and commissions earned on placement of insurance products with carriers for property and casualty and health coverage.
 
Transaction card revenue includes merchant discount fees and electronic funds transfer network fees, net of interchange fees paid to card issuers and assessments paid to card networks. Merchant discount fees represent fees paid by customers for account management and electronic processing of card transactions. Merchant discount fees are recognized at the time the customer’s transactions are processed or other services are performed. The Company also maintains the TransFund electronic funds transfer network for the benefit of its members, which includes the Bank. Electronic funds transfer fees are recognized as electronic transactions processed on behalf of its members. 
 
Fiduciary and asset management revenue includes fees from asset management, custody, recordkeeping, investment advisory and administration services. Revenue is recognized on an accrual basis at the time the services are performed and may be based on either the fair value of the account or the service provided.
 
Deposit service charges and fees include commercial account service charges, overdraft fees, check card fee revenue and automated service charge and other deposit service fees. Fees are recognized at least quarterly in accordance with published deposit account agreements and disclosure statements for retail accounts or contractual agreements for commercial accounts. Item charges for overdraft or non-sufficient funds items are recognized as items are presented for payment. Account balance charges and activity fees are accrued monthly and collected in arrears. Commercial account activity fees may be offset by an earnings credit based on account balances. Check card fees represent interchange fees paid by a merchant bank for transactions processed from cards issued by the Company. Check card fees are recognized when transactions are processed.  

Mortgage banking revenue includes revenues recognized in conjunction with the origination, marketing and servicing of conventional and government-sponsored residential mortgage loans. Mortgage production revenue includes net realized gains (losses) on sales of residential mortgage loans in the secondary market and the net change in unrealized gains (losses) on residential mortgage loans held for sale. Mortgage production revenue also includes changes in the fair value of derivative contracts not designated as hedging instruments related to residential mortgage loan commitments and forward sales contracts. Mortgage servicing revenue includes servicing fee income and late charges on loans serviced for others.

Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended September 30, 2019.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other3
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
24,091

 
$
—

 
$
24,091

 
$
24,091

 
$
—

Customer hedging revenue
2,283

 
—

 
1,810

 
591

 
4,684

 
4,684

 
—

Retail brokerage revenue
—

 
—

 
4,204

 
—

 
4,204

 
—

 
4,204

Insurance brokerage revenue
—

 
—

 
3,375

 
(513
)
 
2,862

 
—

 
2,862

Investment banking revenue
4,408

 
—

 
3,590

 
1

 
7,999

 
3,762

 
4,237

Brokerage and trading revenue
6,691

 
—

 
37,070

 
79

 
43,840

 
32,537

 
11,303

TransFund EFT network revenue
18,465

 
1,020

 
(23
)
 
2

 
19,464

 
—

 
19,464

Merchant services revenue
2,203

 
14

 
—

 
—

 
2,217

 
—

 
2,217

Corporate card revenue
328

 
—

 
6

 
—

 
334

 
—

 
334

Transaction card revenue
20,996

 
1,034

 
(17
)
 
2

 
22,015

 
—

 
22,015

Personal trust revenue
—

 
—

 
20,239

 
(1
)
 
20,238

 
—

 
20,238

Corporate trust revenue
—

 
—

 
6,204

 
1

 
6,205

 
—

 
6,205

Institutional trust & retirement plan services revenue
—

 
—

 
10,740

 
—

 
10,740

 
—

 
10,740

Investment management services and other revenue
—

 
—

 
6,480

 
(42
)
 
6,438

 
—

 
6,438

Fiduciary and asset management revenue
—

 
—

 
43,663

 
(42
)
 
43,621

 
—

 
43,621

Commercial account service charge revenue
10,609

 
467

 
540

 
(3
)
 
11,613

 
—

 
11,613

Overdraft fee revenue
81

 
9,603

 
45

 
3

 
9,732

 
—

 
9,732

Check card revenue
—

 
5,721

 
—

 
—

 
5,721

 
—

 
5,721

Automated service charge and other deposit fee revenue
197

 
1,519

 
53

 
2

 
1,771

 
—

 
1,771

Deposit service charges and fees
10,887

 
17,310

 
638

 
2

 
28,837

 
—

 
28,837

Mortgage production revenue
—

 
13,815

 
—

 
(1
)
 
13,814

 
13,814

 
—

Mortgage servicing revenue
—

 
16,828

 
—

 
(462
)
 
16,366

 
16,366

 
—

Mortgage banking revenue
—

 
30,643

 
—

 
(463
)
 
30,180

 
30,180

 
—

Other revenue
7,585

 
2,474

 
8,068

 
(501
)
 
17,626

 
11,812

 
5,814

Total fees and commissions revenue
$
46,159

 
$
51,461

 
$
89,422

 
$
(923
)
 
$
186,119

 
$
74,529

 
$
111,590

1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
3  
CoBiz operations are included in Funds Management and Other for the first quarter of 2019.

Fees and commissions revenue by reportable segment and primary service line is as follows for the nine months ended September 30, 2019.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other3
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
58,890

 
$
—

 
$
58,890

 
$
58,890

 
$
—

Customer hedging revenue
6,243

 
—

 
9,444

 
1,019

 
16,706

 
16,706

 
—

Retail brokerage revenue
—

 
—

 
12,192

 
(65
)
 
12,127

 
—

 
12,127

Insurance brokerage revenue
—

 
—

 
7,063

 
3,729

 
10,792

 
—

 
10,792

Investment banking revenue
8,345

 
—

 
9,123

 
—

 
17,468

 
7,189

 
10,279

Brokerage and trading revenue
14,588

 
—

 
96,712

 
4,683

 
115,983

 
82,785

 
33,198

TransFund EFT network revenue
54,623

 
2,975

 
(60
)
 
3

 
57,541

 
—

 
57,541

Merchant services revenue
6,351

 
43

 
—

 
122

 
6,516

 
—

 
6,516

Corporate card revenue
598

 
—

 
11

 
2

 
611

 
—

 
611

Transaction card revenue
61,572

 
3,018

 
(49
)
 
127

 
64,668

 
—

 
64,668

Personal trust revenue
—

 
—

 
61,028

 
—

 
61,028

 
—

 
61,028

Corporate trust revenue
—

 
—

 
18,736

 
—

 
18,736

 
—

 
18,736

Institutional trust & retirement plan services revenue
—

 
—

 
32,919

 
—

 
32,919

 
—

 
32,919

Investment management services and other revenue
—

 
—

 
17,730

 
1,591

 
19,321

 
—

 
19,321

Fiduciary and asset management revenue
—

 
—

 
130,413

 
1,591

 
132,004

 
—

 
132,004

Commercial account service charge revenue
31,296

 
1,283

 
1,605

 
1,804

 
35,988

 
—

 
35,988

Overdraft fee revenue
248

 
26,971

 
108

 
(231
)
 
27,096

 
—

 
27,096

Check card revenue
—

 
16,299

 
—

 
165

 
16,464

 
—

 
16,464

Automated service charge and other deposit fee revenue
569

 
4,762

 
228

 
47

 
5,606

 
—

 
5,606

Deposit service charges and fees
32,113

 
49,315

 
1,941

 
1,785

 
85,154

 
—

 
85,154

Mortgage production revenue
—

 
33,554

 
—

 
(3
)
 
33,551

 
33,551

 
—

Mortgage servicing revenue
—

 
50,014

 
—

 
(1,420
)
 
48,594

 
48,594

 
—

Mortgage banking revenue
—

 
83,568

 
—

 
(1,423
)
 
82,145

 
82,145

 
—

Other revenue
17,037

 
7,211

 
19,586

 
(1,009
)
 
42,825

 
28,655

 
14,170

Total fees and commissions revenue
$
125,310

 
$
143,112

 
$
248,603

 
$
5,754

 
$
522,779

 
$
193,585

 
$
329,194

1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
3  
CoBiz operations are included in Funds Management and Other for the first quarter of 2019.

Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended September 30, 2018.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
4,830

 
$
—

 
$
4,830

 
$
4,830

 
$
—

Customer hedging revenue
1,350

 
—

 
6,935

 
229

 
8,514

 
8,514

 
—

Retail brokerage revenue
—

 
—

 
4,398

 
(73
)
 
4,325

 
—

 
4,325

Insurance brokerage revenue
—

 
—

 
170

 
—

 
170

 
—

 
170

Investment banking revenue
1,765

 
—

 
3,482

 
—

 
5,247

 
1,410

 
3,837

Brokerage and trading revenue
3,115

 
—

 
19,815

 
156

 
23,086

 
14,754

 
8,332

TransFund EFT network revenue
18,397

 
1,009

 
(21
)
 
2

 
19,387

 
—

 
19,387

Merchant services revenue
1,995

 
14

 
—

 
—

 
2,009

 
—

 
2,009

Corporate card revenue
—

 
—

 
—

 
—

 
—

 
—

 
—

Transaction card revenue
20,392

 
1,023

 
(21
)
 
2

 
21,396

 
—

 
21,396

Personal trust revenue
—

 
—

 
35,822

 
1

 
35,823

 
—

 
35,823

Corporate trust revenue
—

 
—

 
5,741

 
—

 
5,741

 
—

 
5,741

Institutional trust & retirement plan services revenue
—

 
—

 
11,095

 
(1
)
 
11,094

 
—

 
11,094

Investment management services and other revenue
—

 
—

 
4,903

 
(47
)
 
4,856

 
—

 
4,856

Fiduciary and asset management revenue
—

 
—

 
57,561

 
(47
)
 
57,514

 
—

 
57,514

Commercial account service charge revenue
10,294

 
366

 
587

 
(3
)
 
11,244

 
—

 
11,244

Overdraft fee revenue
95

 
9,413

 
30

 
3

 
9,541

 
—

 
9,541

Check card revenue
—

 
5,254

 
—

 
—

 
5,254

 
—

 
5,254

Automated service charge and other deposit fee revenue
35

 
1,661

 
22

 
8

 
1,726

 
—

 
1,726

Deposit service charges and fees
10,424

 
16,694

 
639

 
8

 
27,765

 
—

 
27,765

Mortgage production revenue
—

 
7,250

 
—

 
—

 
7,250

 
7,250

 
—

Mortgage servicing revenue
—

 
16,748

 
—

 
(462
)
 
16,286

 
16,286

 
—

Mortgage banking revenue
—

 
23,998

 
—

 
(462
)
 
23,536

 
23,536

 
—

Other revenue
5,460

 
2,323

 
5,568

 
(451
)
 
12,900

 
8,799

 
4,101

Total fees and commissions revenue
$
39,391

 
$
44,038

 
$
83,562

 
$
(794
)
 
$
166,197

 
$
47,089

 
$
119,108


1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

Fees and commissions revenue by reportable segment and primary service line is as follows for the nine months ended September 30, 2018.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
21,562

 
$
—

 
$
21,562

 
$
21,562

 
$
—

Customer hedging revenue
6,264

 
—

 
21,511

 
1,441

 
29,216

 
29,216

 
—

Retail brokerage revenue
—

 
—

 
13,751

 
(246
)
 
13,505

 
—

 
13,505

Insurance brokerage revenue
—

 
—

 
555

 
—

 
555

 
—

 
555

Investment banking revenue
5,729

 
—

 
9,655

 
—

 
15,384

 
4,772

 
10,612

Brokerage and trading revenue
11,993

 
—

 
67,034

 
1,195

 
80,222

 
55,550

 
24,672

TransFund EFT network revenue
54,647

 
3,005

 
(61
)
 
5

 
57,596

 
—

 
57,596

Merchant services revenue
5,720

 
45

 
—

 
—

 
5,765

 
—

 
5,765

Corporate card revenue
—

 
—

 
—

 
—

 
—

 
—

 
—

Transaction card revenue
60,367

 
3,050

 
(61
)
 
5

 
63,361

 
—

 
63,361

Personal trust revenue
—

 
—

 
76,481

 
(2
)
 
76,479

 
—

 
76,479

Corporate trust revenue
—

 
—

 
16,317

 
—

 
16,317

 
—

 
16,317

Institutional trust & retirement plan services revenue
—

 
—

 
33,584

 
3

 
33,587

 
—

 
33,587

Investment management services and other revenue
—

 
—

 
14,808

 
(153
)
 
14,655

 
—

 
14,655

Fiduciary and asset management revenue
—

 
—

 
141,190

 
(152
)
 
141,038

 
—

 
141,038

Commercial account service charge revenue
32,150

 
1,087

 
1,802

 
(3
)
 
35,036

 
—

 
35,036

Overdraft fee revenue
283

 
26,665

 
96

 
13

 
27,057

 
—

 
27,057

Check card revenue
—

 
15,515

 
—

 
—

 
15,515

 
—

 
15,515

Automated service charge and other deposit fee revenue
110

 
4,953

 
72

 
17

 
5,152

 
—

 
5,152

Deposit service charges and fees
32,543

 
48,220

 
1,970

 
27

 
82,760

 
—

 
82,760

Mortgage production revenue
—

 
26,617

 
—

 
—

 
26,617

 
26,617

 
—

Mortgage servicing revenue
—

 
50,677

 
—

 
(1,387
)
 
49,290

 
49,290

 
—

Mortgage banking revenue
—

 
77,294

 
—

 
(1,387
)
 
75,907

 
75,907

 
—

Other revenue
17,379

 
6,770

 
18,725

 
(3,093
)
 
39,781

 
27,552

 
12,229

Total fees and commissions revenue
$
122,282

 
$
135,334

 
$
228,858

 
$
(3,405
)
 
$
483,069

 
$
159,009

 
$
324,060

1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
v3.19.3
Fair Value Measurements
 9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements [Text Block] Fair Value Measurements

Fair value is defined by applicable accounting guidance as the price to sell an asset or transfer a liability in an orderly transaction between market participants in the principal market for the given asset or liability at the measurement date based on market conditions at that date. An orderly transaction assumes exposure to the market for a customary period for marketing activities prior to the measurement date and not a forced liquidation or distressed sale. Certain assets and liabilities are recorded in the Company’s financial statements at fair value. Some are recorded on a recurring basis and some on a non-recurring basis.

For some assets and liabilities, observable market transactions and market information might be available. For other assets and liabilities, observable market transactions and market information might not be available. A hierarchy for fair value has been established which categorizes into three levels the inputs to valuation techniques used to measure fair value. The three levels are as follows:

Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) - Fair value is based on unadjusted quoted prices in active markets for identical assets or liabilities.

Significant Other Observable Inputs (Level 2) - Fair value is based on significant other observable inputs which are generally determined based on a single price for each financial instrument provided to us by an applicable third-party pricing service and is based on one or more of the following:

•
Quoted prices for similar, but not identical, assets or liabilities in active markets;
•
Quoted prices for identical or similar assets or liabilities in inactive markets;
•
Inputs other than quoted prices that are observable, such as interest rate and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates;
•
Other inputs derived from or corroborated by observable market inputs.

Significant Unobservable Inputs (Level 3) - Fair value is based upon model-based valuation techniques for which at least one significant assumption is not observable in the market.

Transfers between levels are recognized as of the end of the reporting period. There were no transfers in or out of quoted prices in active markets for identical instruments to significant other observable inputs or significant unobservable inputs during the three and nine months ended September 30, 2019 and 2018, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the three and nine months ended September 30, 2019 and 2018 are included in the summary of changes in recurring fair values measured using unobservable inputs.

The underlying methods used by the third-party pricing services are considered in determining the primary inputs used to determine fair values. Management has evaluated the methodologies employed by the third-party pricing services by comparing the price provided by the pricing service with other sources, including brokers' quotes, sales or purchases of similar instruments and discounted cash flows to establish a basis for reliance on the pricing service values. Significant differences between the pricing service provided value and other sources are discussed with the pricing service to understand the basis for their values. Based on all observable inputs, management may adjust prices obtained from third-party pricing services to more appropriately reflect the prices that would be received to sell assets or paid to transfer liabilities in orderly transactions in the current market. No significant adjustments were made to prices provided by third-party pricing services at September 30, 2019 or December 31, 2018.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The fair value of financial assets and liabilities measured on a recurring basis was as follows as of September 30, 2019 (in thousands):
 
 
Total
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
$
63,334

 
$
—

 
$
63,334

 
$
—

Residential agency mortgage-backed securities
 
1,480,458

 
—

 
1,480,458

 
—

Municipal and other tax-exempt securities
 
44,105

 
—

 
44,105

 
—

Asset-backed securities
 
36,928

 
—

 
36,928

 
—

Other trading securities
 
50,387

 
—

 
50,387

 
—

Total trading securities
 
1,675,212

 
—

 
1,675,212

 
—

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
2,296

 
2,296

 
—

 
—

Municipal and other tax-exempt securities
 
1,848

 
—

 
1,848

 
—

Residential agency mortgage-backed securities
 
7,740,461

 
—

 
7,740,461

 
—

Residential non-agency mortgage-backed securities
 
44,803

 
—

 
44,803

 
—

Commercial agency mortgage-backed securities
 
3,234,671

 
—

 
3,234,671

 
—

Other debt securities
 
472

 
—

 
—

 
472

Total available for sale securities
 
11,024,551

 
2,296

 
11,021,783

 
472

Fair value option securities:
 
 
 
 
 
 
 
 
U.S. Treasury
 
552,536

 
552,536

 
—

 
—

Residential agency mortgage-backed securities
 
1,263,862

 
—

 
1,263,862

 
—

Total fair value option securities
 
1,816,398

 
552,536

 
1,263,862

 
—

Residential mortgage loans held for sale
 
282,487

 
—

 
268,919

 
13,568

Mortgage servicing rights1
 
193,661

 
—

 
—

 
193,661

Derivative contracts, net of cash collateral2
 
352,019

 
40,491

 
311,528

 
—

Liabilities:
 
 

 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
336,791

 
—

 
336,791

 
—

1 
A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
2 
See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded energy, interest rate and agricultural derivative contacts, net of cash margin. Derivative contacts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate derivative contracts, fully offset by cash margin.

The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2018 (in thousands):
 
 
Total
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
$
63,765

 
$
—

 
$
63,765

 
$
—

Residential agency mortgage-backed securities
 
1,791,584

 
—

 
1,791,584

 
—

Municipal and other tax-exempt securities
 
34,507

 
—

 
34,507

 
—

Asset-backed securities
 
42,656

 
—

 
42,656

 
—

Other trading securities
 
24,411

 
—

 
24,411

 
—

Total trading securities
 
1,956,923

 
—

 
1,956,923

 
—

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
493

 
493

 
—

 
—

Municipal and other tax-exempt securities
 
2,864

 
—

 
2,864

 
—

Residential agency mortgage-backed securities
 
5,804,708

 
—

 
5,804,708

 
—

Residential non-agency mortgage-backed securities
 
59,736

 
—

 
59,736

 
—

Commercial agency mortgage-backed securities
 
2,953,889

 
—

 
2,953,889

 
—

Other debt securities
 
35,430

 
—

 
34,958

 
472

Total available for sale securities
 
8,857,120

 
493

 
8,856,155

 
472

Fair value option securities – Residential agency mortgage-backed securities
 
283,235

 
—

 
283,235

 
—

Residential mortgage loans held for sale
 
149,221

 
—

 
134,014

 
15,207

Mortgage servicing rights1
 
259,254

 
—

 
—

 
259,254

Derivative contracts, net of cash collateral2
 
320,929

 
44,074

 
276,855

 
—

Liabilities:
 


 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
362,306

 
—

 
362,306

 
—

1 
A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
2 
See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural derivative contacts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate contracts, fully offset by cash margin.



Following is a description of the Company's valuation methodologies used for assets and liabilities measured on a recurring basis:
Securities
The fair values of trading, available for sale and fair value option securities are based on quoted prices for identical instruments in active markets, when available. If quoted prices for identical instruments are not available, fair values are based on significant other observable inputs such as quoted prices of comparable instruments or interest rates and credit spreads, yield curves, volatilities, prepayment speeds and loss severities. The Company has elected to carry all residential mortgage-backed securities guaranteed by U.S. government agencies held as economic hedges against changes in the fair value of mortgage servicing rights at fair value with changes in the fair value recognized in earnings.

The fair value of certain available for sale municipal and other debt securities may be based on significant unobservable inputs. These significant unobservable inputs include limited observed trades, projected cash flows, current credit rating of the issuers and, when applicable, the insurers of the debt and observed trades of similar debt. Discount rates are primarily based on references to interest rate spreads on comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies adjusted for a lack of trading volume. Significant unobservable inputs are developed by investment securities professionals involved in the active trading of similar securities. A summary of significant inputs used to value these securities follows. A management committee composed of senior members from the Company's Capital Markets, Risk Management and Finance departments assesses the appropriateness of these inputs quarterly.

Derivatives

All derivative instruments are carried on the balance sheet at fair value. Fair values for exchange-traded contracts are based on quoted prices. Fair values for over-the-counter interest rate, commodity and foreign exchange contracts are based on valuations provided either by third-party dealers in the contracts, quotes provided by independent pricing services, or a third-party provided pricing model that uses significant other observable market inputs.

Credit risk is considered in determining the fair value of derivative instruments. Management determines fair value adjustments based on various risk factors including but not limited to current fair value, probability of default and loss given default.

We also consider our own credit risk in determining the fair value of derivative contracts. Changes in our credit rating would affect the fair value of our derivative liabilities. In the event of a credit downgrade, the fair value of our derivative liabilities would increase.

Residential Mortgage Loans Held for Sale

Residential mortgage loans held for sale are carried on the balance sheet at fair value. The Company has elected to carry all residential mortgage loans originated for sale at fair value. Changes in the fair value of these financial instruments are recognized in earnings. The fair values of residential mortgage loans held for sale are based upon quoted market prices of such loans sold in securitization transactions, including related unfunded loan commitments and forward sales contracts. The fair value of mortgage loans that were unable to be sold to U.S. government agencies were determined using quoted prices of loans that are sold in securitization transactions with a liquidity discount applied.

The following represents the changes for the three and nine months ended September 30, 2019 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):

 
 
Available for sale - Other debt securities
 
Residential mortgage loans held for sale
Balance, June 30, 2019
 
$
472

 
$
16,073

Transfer to Level 3 from Level 21
 
—

 
261

Purchases
 
—

 
—

Proceeds from sales
 
—

 
(3,152
)
Redemptions and distributions
 
—

 
—

Gain (loss) recognized in earnings:
 
 
 
 
Mortgage banking revenue
 
—

 
386

Other comprehensive income (loss):
 
 
 
 
Net change in unrealized gain (loss)
 
—

 
—

Balance, September 30, 2019
 
$
472

 
$
13,568

1  
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

 
 
Available for sale - Other debt securities
 
Residential mortgage loans held for sale
Balance, December 31, 2018
 
$
472

 
$
15,207

Transfer to Level 3 from Level 21
 
—

 
2,150

Purchases
 
—

 
—

Proceeds from sales
 
—

 
(4,531
)
Redemptions and distributions
 
—

 
—

Gain (loss) recognized in earnings:
 
 
 
 
Mortgage banking revenue
 
—

 
742

Other comprehensive income (loss):
 
 
 
 
Net change in unrealized gain (loss)
 
—

 
—

Balance, September 30, 2019
 
$
472

 
$
13,568


1  
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

The following represents the changes for the three and nine months ended September 30, 2018 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
 
 
Available for Sale Securities
 
 
 
 
Municipal and other tax-exempt securities
 
Other debt securities
 
Residential mortgage loans held for sale
Balance, June 30, 2018
 
$
2,030

 
$
471

 
$
14,243

Transfer to Level 3 from Level 21
 
—

 
—

 
2,862

Purchases
 
—

 
—

 
—

Proceeds from sales
 
—

 
—

 
(143
)
Redemptions and distributions
 
(2,050
)
 
—

 
—

Gain (loss) recognized in earnings:
 
 
 
 
 
 
Mortgage banking revenue
 
—

 
—

 
(124
)
Other comprehensive income (loss):
 
 
 
 
 
 
Net change in unrealized gain (loss)
 
20

 
1

 
—

Balance, September 30, 2018
 
$
—

 
$
472

 
$
16,838

1 
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

 
 
Available for Sale Securities
 
 
 
 
Municipal and other tax-exempt
 
Other debt securities
 
Residential mortgage loans held for sale
Balance, December 31, 2017
 
$
4,802

 
$
472

 
$
12,299

Transfer to Level 3 from Level 21
 
—

 
—

 
5,603

Purchases
 
—

 
—

 
—

Proceeds from sales
 
—

 
—

 
(853
)
Redemptions and distributions
 
(5,095
)
 
—

 
—

Gain (loss) recognized in earnings
 
 
 
 
 
 
Mortgage banking revenue
 
—

 
—

 
(211
)
Other comprehensive income (loss):
 
 
 
 
 
 
Net change in unrealized gain (loss)
 
293

 
—

 
—

Balance, September 30, 2018
 
$
—

 
$
472

 
$
16,838


1 
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.


A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of September 30, 2019 follows (in thousands):
 
 
Fair
Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
 
 
 
 
 
 
 
 
 
 
 
Available for sale securities – Other debt securities
 
472

 
Discounted cash flows
1 
Interest rate spread
 
7.46%-7.46% (7.46%)
3 
94.42%-94.42% (94.42%)
2 
Residential mortgage loans held for sale
 
13,568

 
Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
 
Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies.
 
96.36%
 
1 
Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.
2 
Represents fair value as a percentage of par value.
3 
Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding approximately 3 percent.

A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of December 31, 2018 follows (in thousands):
 
 
Fair
Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
 
 
 
 
 
 
 
 
 
 
 
Available for sale securities – Other debt securities
 
472

 
Discounted cash flows
1 
Interest rate spread
 
7.88%-7.88% (7.88%)
3 
94.44%-94.44% (94.44%)
2 
Residential mortgage loans held for sale
 
15,207

 
Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
 
Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies.
 
92.38%
 
1 
Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume
2 
Represents fair value as a percentage of par value.
3 
Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 3 percent.



Fair Value of Assets and Liabilities Measured on a Non-Recurring Basis

Assets measured at fair value on a non-recurring basis include collateral for certain impaired loans and real property and other assets acquired to satisfy loans, which are based primarily on comparisons to completed sales of similar assets.

The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at September 30, 2019 for which the fair value was adjusted during the nine months ended September 30, 2019:
 
 
 
 
 
 
 
Fair Value Adjustments for the
 
Carrying Value at September 30, 2019
 
Three Months Ended
Sept. 30, 2019
Recognized in:
 
Nine Months Ended
Sept. 30, 2019
Recognized in:
 
Quoted Prices
in Active Markets for Identical Instruments
 
Significant
Other
Observable
Inputs
 
Significant
Unobservable
Inputs
 
Gross charge-offs against allowance for loan losses
 
Net losses (gains) and operating expenses of repossessed assets
 
Gross charge-offs against allowance for loan losses
 
Net losses (gains) and operating expenses of repossessed assets
Impaired loans
$
—

 
$
79

 
$
9,810

 
$
2,644

 
$
—

 
$
13,868

 
$
—

Real estate and other repossessed assets
—

 
5,044

 
936

 
—

 
(979
)
 
—

 
(532
)
 
The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at September 30, 2018 for which the fair value was adjusted during the nine months ended September 30, 2018:
 
 
 
 
 
 
 
Fair Value Adjustments for the
 
Carrying Value at September 30, 2018
 
Three Months Ended
Sept. 30, 2018
Recognized in:
 
Nine Months Ended
Sept. 30, 2018
Recognized in:
 
Quoted Prices
in Active Markets for Identical Instruments
 
Significant
Other
Observable
Inputs
 
Significant
Unobservable
Inputs
 
Gross charge-offs against allowance for loan losses
 
Net losses and operating expenses of repossessed assets
 
Gross charge-offs against allowance for loan losses
 
Net losses and operating expenses of repossessed assets
Impaired loans
$
—

 
$
1,065

 
$
24,428

 
$
9,086

 
$
—

 
$
16,279

 
$
—

Real estate and other repossessed assets
—

 
4,608

 
6,545

 
—

 
2,161

 
—

 
7,388



The fair value of collateral-dependent impaired loans secured by real estate and real estate and other repossessed assets and the related fair value adjustments are generally based on unadjusted third-party appraisals. Our appraisal review policies require appraised values to be supported by observed inputs derived principally from or corroborated by observable market data. Appraisals that are not based on observable inputs or that require significant adjustments or fair value measurements that are not based on third-party appraisals are considered to be based on significant unobservable inputs. Non-recurring fair value measurements of collateral-dependent impaired loans and real estate and other repossessed assets based on significant unobservable inputs are generally due to estimates of current fair values between appraisal dates. Significant unobservable inputs include listing prices for the same or comparable assets, uncorroborated expert opinions or management's knowledge of the collateral or industry. Non-recurring fair value measurements of collateral dependent loans secured by mineral rights are generally determined by our internal staff of engineers on projected cash flows under current market conditions and are based on significant unobservable inputs. Projected cash flows are discounted according to risk characteristics of the underlying oil and gas properties. Assets are evaluated to demonstrate with reasonable certainty that crude oil, natural gas and natural gas liquids can be recovered from known oil and gas reservoirs under existing economic and operating conditions at current prices with existing conventional equipment, operating methods and costs. Significant unobservable inputs are developed by asset management and workout professionals and approved by senior Credit Administration executives.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of September 30, 2019 follows (in thousands):
 
 
Fair Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
Impaired loans
 
$
9,810

 
Discounted cash flows
 
Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
8% - 76% (28%)1
Real estate and other repossessed assets
 
936

 
Appraised value, as adjusted
 
Marketability adjustments off appraised value2
 
75% - 89% (85%)
1 
Represents fair value as a percentage of the unpaid principal balance.
2 
Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of September 30, 2018 follows (in thousands):
 
 
Fair Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
Impaired loans
 
$
24,428

 
Discounted cash flows
 
Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
41% - 84% (55%)1
Real estate and other repossessed assets
 
6,545

 
Discounted cash flows
 
Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
N/A

1  
Represents fair value as a percentage of the unpaid principal balance.

Fair Value of Financial Instruments

The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of September 30, 2019 (dollars in thousands):
 
 
Carrying
Value
 
Estimated
Fair
Value
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Cash and due from banks
 
$
761,130

 
$
761,130

 
$
761,130

 
$
—

 
$
—

Interest-bearing cash and cash equivalents
 
465,458

 
465,458

 
465,458

 
—

 
—

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
63,334

 
63,334

 
—

 
63,334

 
—

Residential agency mortgage-backed securities
 
1,480,458

 
1,480,458

 
—

 
1,480,458

 
—

Municipal and other tax-exempt securities
 
44,105

 
44,105

 
—

 
44,105

 
—

Asset-backed securities
 
36,928

 
36,928

 
—

 
36,928

 
—

Other trading securities
 
50,387

 
50,387

 
—

 
50,387

 
—

Total trading securities
 
1,675,212

 
1,675,212

 
—

 
1,675,212

 
—

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
104,418

 
107,647

 
—

 
107,647

 
—

Residential agency mortgage-backed securities
 
11,125

 
11,650

 
—

 
11,650

 
—

Other debt securities
 
188,681

 
204,724

 
—

 
7,702

 
197,022

Total investment securities
 
304,224

 
324,021

 
—

 
126,999

 
197,022

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
2,296

 
2,296

 
2,296

 
—

 
—

Municipal and other tax-exempt securities
 
1,848

 
1,848

 
—

 
1,848

 
—

Residential agency mortgage-backed securities
 
7,740,461

 
7,740,461

 
—

 
7,740,461

 
—

Residential non-agency mortgage-backed securities
 
44,803

 
44,803

 
—

 
44,803

 
—

Commercial agency mortgage-backed securities
 
3,234,671

 
3,234,671

 
—

 
3,234,671

 
—

Other debt securities
 
472

 
472

 
—

 
—

 
472

Total available for sale securities
 
11,024,551

 
11,024,551

 
2,296

 
11,021,783

 
472

Fair value option securities:
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
 
552,536

 
552,536

 
552,536

 
—

 
—

Residential agency mortgage-backed securities
 
1,263,862

 
1,263,862

 
—

 
1,263,862

 
—

Total fair value option securities
 
1,816,398

 
1,816,398

 
552,536

 
1,263,862

 
—

Residential mortgage loans held for sale
 
282,487

 
282,487

 
—

 
268,919

 
13,568

Loans:
 
 

 
 

 
 
 
—

 
 
Commercial
 
14,424,625

 
14,397,846

 
—

 
—

 
14,397,846

Commercial real estate
 
4,626,057

 
4,626,804

 
—

 
—

 
4,626,804

Residential mortgage
 
2,117,303

 
2,132,158

 
—

 
—

 
2,132,158

Personal
 
1,117,382

 
1,108,984

 
—

 
—

 
1,108,984

Total loans
 
22,285,367

 
22,265,792

 
—

 
—

 
22,265,792

Allowance for loan losses
 
(204,432
)
 
—

 
—

 
—

 
—

Loans, net of allowance
 
22,080,935

 
22,265,792

 
—

 
—

 
22,265,792

Mortgage servicing rights
 
193,661

 
193,661

 
—

 
—

 
193,661

Derivative instruments with positive fair value, net of cash collateral
 
352,019

 
352,019

 
40,491

 
311,528

 
—

Deposits with no stated maturity
 
23,923,535

 
23,923,535

 
—

 
—

 
23,923,535

Time deposits
 
2,243,541

 
2,241,778

 
—

 
—

 
2,241,778

Other borrowed funds
 
10,235,385

 
10,193,602

 
—

 
—

 
10,193,602

Subordinated debentures
 
275,909

 
276,393

 
—

 
276,393

 
—

Derivative instruments with negative fair value, net of cash collateral
 
336,791

 
336,791

 
—

 
336,791

 
—


The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of December 31, 2018 (dollars in thousands):
 
 
Carrying
Value
 
Estimated
Fair
Value
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Cash and due from banks
 
$
741,749

 
$
741,749

 
$
741,749

 
$
—

 
$
—

Interest-bearing cash and cash equivalents
 
401,675

 
401,675

 
401,675

 
—

 
—

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
63,765

 
63,765

 
—

 
63,765

 
—

Residential agency mortgage-backed securities
 
1,791,584

 
1,791,584

 
—

 
1,791,584

 
—

Municipal and other tax-exempt securities
 
34,507

 
34,507

 
—

 
34,507

 
—

Asset-backed securities
 
42,656

 
42,656

 
—

 
42,656

 
—

Other trading securities
 
24,411

 
24,411

 
—

 
24,411

 
—

Total trading securities
 
1,956,923

 
1,956,923

 
—

 
1,956,923

 
—

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
137,296

 
138,562

 
—

 
138,562

 
—

Residential agency mortgage-backed securities
 
12,612

 
12,770

 
—

 
12,770

 
—

Other debt securities
 
205,279

 
215,966

 
—

 
7,905

 
208,061

Total investment securities
 
355,187

 
367,298

 
—

 
159,237

 
208,061

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
493

 
493

 
493

 
—

 
—

Municipal and other tax-exempt securities
 
2,864

 
2,864

 
—

 
2,864

 
—

Residential agency mortgage-backed securities
 
5,804,708

 
5,804,708

 
—

 
5,804,708

 
—

Residential non-agency mortgage-backed securities
 
59,736

 
59,736

 
—

 
59,736

 
—

Commercial agency mortgage-backed securities
 
2,953,889

 
2,953,889

 
—

 
2,953,889

 
—

Other debt securities
 
35,430

 
35,430

 
—

 
34,958

 
472

Total available for sale securities
 
8,857,120

 
8,857,120

 
493

 
8,856,155

 
472

Fair value option securities – Residential agency mortgage-backed securities
 
283,235

 
283,235

 
—

 
283,235

 
—

Residential mortgage loans held for sale
 
149,221

 
149,221

 
—

 
134,014

 
15,207

Loans:
 
 

 
 

 
 
 
 
 
 
Commercial
 
13,636,078

 
13,526,162

 
—

 
—

 
13,526,162

Commercial real estate
 
4,764,813

 
4,713,747

 
—

 
—

 
4,713,747

Residential mortgage
 
2,230,033

 
2,213,951

 
—

 
—

 
2,213,951

Personal
 
1,025,806

 
1,024,368

 
—

 
—

 
1,024,368

Total loans
 
21,656,730

 
21,478,228

 
—

 
—

 
21,478,228

Allowance for loan losses
 
(207,457
)
 
—

 
—

 
—

 
—

Loans, net of allowance
 
21,449,273

 
21,478,228

 
—

 
—

 
21,478,228

Mortgage servicing rights
 
259,254

 
259,254

 
—

 
—

 
259,254

Derivative instruments with positive fair value, net of cash collateral
 
320,929

 
320,929

 
44,074

 
276,855

 
—

Deposits with no stated maturity
 
23,150,383

 
23,150,383

 
—

 
—

 
23,150,383

Time deposits
 
2,113,380

 
2,073,538

 
—

 
—

 
2,073,538

Other borrowed funds
 
7,142,801

 
7,071,953

 
—

 
—

 
7,071,953

Subordinated debentures
 
275,913

 
261,977

 
—

 
261,977

 
—

Derivative instruments with negative fair value, net of cash collateral
 
362,306

 
362,306

 
—

 
362,306

 
—



Because no market exists for certain of these financial instruments and management does not intend to sell these financial instruments, the fair values shown in the tables above may not represent values at which the respective financial instruments could be sold individually or in the aggregate at the given reporting date.
v3.19.3
Subsequent Events
 9 Months Ended
Sep. 30, 2019
Subsequent Events [Abstract]  
Subsequent Events [Text Block] Subsequent Events

The Company evaluated events from the date of the consolidated financial statements on September 30, 2019 through the issuance of those consolidated financial statements included in this Quarterly Report on Form 10-Q. No events were identified requiring recognition in and/or disclosure in the consolidated financial statements.
v3.19.3
Significant Accounting Policies (Policies)
 9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Basis of Accounting, Policy [Policy Text Block]
The accompanying unaudited consolidated financial statements of BOK Financial Corporation (“BOK Financial” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.
Principles of Consolidation [Policy Text Block]
The unaudited consolidated financial statements include accounts of BOK Financial and its subsidiaries, principally BOKF, NA (“the Bank”), BOK Financial Securities, Inc., and BOK Financial Private Wealth, Inc. Operating divisions of the Bank include Bank of Albuquerque, Bank of Oklahoma, Bank of Texas, BOK Financial in Arizona, Arkansas, Colorado and Kansas/Missouri, BOK Financial Mortgage and the TransFund electronic funds network.
Reclassification, Policy [Policy Text Block]
Certain reclassifications have been made to conform to the current period presentation.
Newly Adopted and Pending Accounting Policies [Policy Text Block]
Newly Adopted and Pending Accounting Policies

Financial Accounting Standards Board (“FASB”)

FASB Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02")

On February 25, 2016, the FASB issued ASU 2016-02 to increase transparency and comparability by recognizing lease assets and liabilities on the balance sheet and disclosing key information about leasing arrangements. Lessees are required to recognize an obligation for future lease payments measured on a discounted basis and a right-of-use asset. The Company adopted the new standard January 1, 2019 through a cumulative effect adjustment to retained earnings. Prior periods were not restated. BOKF elected to apply all practical expedients other than the lessee’s practical expedient to combine lease and non-lease components which would further gross up lease liability and the related right-of-use asset. The implementation of ASU 2016-02 increased the reported right-of-use asset and lease liability by $137 million. The effect on retained earnings was immaterial.

FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Assets Measured at Amortized Cost ("ASU 2016-13" or "CECL")

On June 16, 2016, the FASB issued ASU 2016-13 to provide more timely recording of credit losses on loans and other financial assets measured at amortized cost, effective for the Company's annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years.

The company has established a CECL implementation team to evaluate the impact to the Company’s financial statements. The CECL implementation team, overseen by the Chief Credit Officer, Chief Financial Officer and Chief Risk Officer, has developed a project plan that incorporates input from various departments within the bank including Credit, Financial Reporting, Risk and Information Technology among others. The Audit Committee and Credit Committee of the Board of Directors is periodically updated on project progress. In the second half of 2019, the implementation team is focused on design and operation of internal controls over the expected credit losses estimate and formalizing governance and approval processes. This includes finalizing model validation, refinement of model assumptions and qualitative framework, as well as drafting policies, reporting, and disclosures. These activities support our parallel runs and related results. The Company will adopt the standard on January 1, 2020 through a cumulative-effect adjustment to retained earnings.
FASB Accounting Standards Update No. 2019-01, Leases (Topic 842): Codification Improvements ("ASU 2019-01")

On March 5, 2019, the FASB issued ASU 2019-01 which amends certain aspects of leasing standard ASU 2016-02. ASU 2019-01 provides guidance for determining fair value of the underlying asset by lessors that are not manufacturers or dealers. The ASU also requires depository and lending lessors within the scope of ASC 942 to classify principal payments received from sales-type and direct financing leases within "investing activities" on the statement of cash flows. For the two issues above, the ASU is effective for the Company for fiscal years beginning after December 15, 2019, and interim periods therein; however early adoption is permitted. Additionally, ASU 2019-01 also clarifies interim disclosure requirements during transition and is effective with the original transition requirements in Topic 842. Adoption of ASU 2019-01 is not expected to have a material impact on the Company's financial statements.

FASB Accounting Standards Update No. 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments ("ASU 2019-04")

On April 25, 2019, the FASB issued ASU 2019-04 which clarifies certain aspects of the accounting for credit losses, hedging activities, and financial instruments addressed by ASUs 2016-13, 2017-12, and 2016-01, respectively. Significant amendments made to the provisions of ASU 2016-13 by ASU 2019-04 include providing certain alternatives for the measurement of the allowance for credit losses on accrued interest receivable and clarifying steps entities should take when recording the transfer of loans or debt securities between measurement classification or categories. ASU 2019-04 further clarifies the expectation that entities include recoveries of financial assets in the calculation of the current expected credit losses allowance for both pools of financial assets and individual financial assets. Significant amendments made to the provisions of ASU 2017-12 by ASU 2019-04 include clarification on partial-term fair value hedges of interest rate risk, amortization of fair value hedge basis adjustments and disclosure of fair value hedge basis adjustments. Significant amendments made to provisions of ASU 2016-01include clarification of the measurement alternative practice for equity securities and remeasurement of equity securities at historical exchange rates. ASU 2019-04 includes other amendments which clarify various provisions within the codification. ASU 2019-04 is effective for the Company for fiscal years beginning after December 15, 2019 and interim periods therein. Adoption of ASU 2019-04 is not expected to have a material impact on the Company's financial statements.

FASB Accounting Standards Update No. 2019-05, Financial Instruments-Credit Losses (Topic 326): Targeted Transition Relief ("ASU 2019-05")

On May 15, 2019, the FASB issued ASU 2019-05 which provides transition relief for entities adopting the Board's credit losses standard, ASU 2016-13. ASU 2019-05 amends ASU 2016-13 to allow companies to irrevocably elect, upon adoption of ASU 2016-13, the fair value option for financial instruments that meet specific requirements and is effective for the Company for annual reporting periods beginning after December 15, 2019. Adoption of ASU 2019-05 is not expected to have a material impact on the Company's financial statements.
Derivatives, Policy [Policy Text Block]
Derivative instruments may be used by the Company as part of its internal risk management programs or may be offered to customers. All derivative instruments are carried at fair value and changes in fair value are reported in earnings as they occur. Credit risk is also considered in determining fair value. Deterioration in the credit rating of customer or other counterparties reduced the fair value of asset contracts. Deterioration of our credit rating could decrease the fair value of our derivative liabilities.

When bilateral netting agreements or similar arrangements exist between the Company and its counterparties that create a single legal claim or obligation to pay or receive the net amount in settlement of the individual derivative contracts, the Company reports derivative assets and liabilities on a net by derivative contract type by counterparty basis.

Derivative contracts may require the Company to provide or receive cash margin as collateral for derivative assets and liabilities. Derivative assets and liabilities are reported net of cash margin when certain conditions are met. In addition, derivative contracts executed with customers under Customer Risk Management Programs may be secured by non-cash collateral in conjunction with a credit agreement with that customer. Access to collateral in the event of default is reasonably assured.
 
None of these derivative contracts have been designated as hedging instruments for accounting purposes.

Customer Risk Management Programs
 
BOK Financial offers programs to permit its customers to manage various risks, including fluctuations in energy, cattle and other agricultural products, interest rates and foreign exchange rates with derivative contracts. Customers may also manage interest rate risk through interest rate swaps used by borrowers to modify interest rate terms of their loans. Derivative contracts are executed between the customers and BOK Financial. Offsetting contracts are executed between BOK Financial and other selected counterparties to minimize the risk of changes in commodity prices, interest rates or foreign exchange rates. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to BOK Financial as profit and compensation for administrative costs and credit risk which is recognized over the life of the contracts and included in Other operating revenue – Brokerage and trading revenue in the Consolidated Statements of Earnings.
 
Trading

BOK Financial may offer derivative instruments such as to-be-announced securities to mortgage banking customers to hedge their loan production or to mitigate the Company's market risk of holding trading securities. Changes in the fair value of derivative instruments for trading purposes or used to mitigate the market risk of holding trading securities are included in Other operating revenue – Brokerage and trading revenue.

Internal Risk Management Programs
 
BOK Financial may use derivative contracts in managing its interest rate sensitivity, as part of its economic hedge of the change in the fair value of mortgage servicing rights and to mitigate the market risk of holding trading securities. Changes in the fair value of derivative instruments used in managing interest rate sensitivity and as part of the economic hedge of changes in the fair value of mortgage servicing rights are included in Other operating revenue – Gain (loss) on derivatives, net in the Consolidated Statements of Earnings.
As discussed in Note 6, certain derivative contracts not designated as hedging instruments related to mortgage loan commitments and forward sales contracts are included in Residential mortgage loans held for sale on the Consolidated Balance Sheets. See Note 6 for additional discussion of notional, fair value and impact on earnings of these contracts.
Loans and Allowances for Credit Losses, Loans [Policy Text Block]

Loans

Loans are either secured or unsecured based on the type of loan and the financial condition of the borrower. Repayment is generally expected from cash flow or proceeds from the sale of selected assets of the borrower. BOK Financial is exposed to risk of loss on loans due to the borrower’s difficulties, which may arise from any number of factors, including problems within the respective industry or local economic conditions. Access to collateral, in the event of borrower default, is reasonably assured through adherence to applicable lending laws and through sound lending standards and credit review procedures. Accounting policies for all loans, excluding residential mortgage loans guaranteed by U.S. government agencies, are as follows.

Interest is accrued at the applicable interest rate on the principal amount outstanding. Loans are placed on nonaccruing status when, in the opinion of management, full collection of principal or interest is uncertain. Internally risk graded loans are individually evaluated for nonaccruing status quarterly. Non-risk graded loans are generally placed on nonaccruing status when more than 90 days past due or within 60 days of being notified of the borrower's bankruptcy filing. Interest previously accrued but not collected is charged against interest income when the loan is placed on nonaccruing status. Payments on nonaccruing loans are applied to principal or recognized as interest income, according to management’s judgment as to the collectability of principal. Loans may be returned to accruing status when, in the opinion of management, full collection of principal and interest, including principal previously charged off, is probable based on improvements in the borrower’s financial condition or a sustained period of performance.

Loans to borrowers experiencing financial difficulties may be modified in troubled debt restructurings ("TDRs"). Primarily all TDRs are classified as nonaccruing, excluding loans guaranteed by U.S. government agencies. Modifications generally consist of extension of payment terms or interest rate concessions and may result either voluntarily through negotiations with the borrower or involuntarily through court order. Generally, principal and accrued but unpaid interest is not voluntarily forgiven.

Performing loans may be renewed under the current collateral value, debt service ratio and other underwriting standards. Nonaccruing loans may be renewed and will remain classified as nonaccruing. 

Occasionally, loans, other than residential mortgage loans, may be held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains or losses recognized in other gains (losses), net in the Statements of Earnings.

All loans are charged off when the loan balance or a portion of the loan balance is no longer supported by the paying capacity of the borrower or when the required cash flow is reduced in a TDR. The charge-off amount is determined through a quarterly evaluation of available cash resources and collateral value and charge-offs are taken in the quarter in which the loss is identified. Non-risk graded loans that are past due between 60 days and 180 days, based on the loan product type, are charged off. Loans to borrowers whose personal obligation has been discharged through Chapter 7 bankruptcy proceedings are charged off within 60 days of notice of the bankruptcy filing, regardless of payment status.

Loan origination and commitment fees and direct loan acquisition and origination costs are deferred and amortized as an adjustment to yield over the life of the loan or over the commitment period, as applicable. Amortization does not anticipate loan prepayments. Net unamortized fees are recognized in full at time of payoff.

Qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. Under certain performance conditions specified in government programs, the Company may have the right, but not the obligation to repurchase loans from GNMA pools. These loans no longer qualify for sale accounting and are recognized in the Consolidated Balance Sheets. Guaranteed loans are considered impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. The original principal guarantee remains; however, interest accrues at a curtailed rate as specified in the programs. The carrying value of these loans is reduced based on an estimate of the expected cash flows discounted at the original note rate plus a liquidity spread. Guaranteed loans may be modified in TDRs in accordance with U.S. government agency guidelines. Interest continues to accrue based on the modified rate. Guaranteed loans may either be resold into GNMA pools after a performance period specified by the programs or foreclosed and conveyed to the guarantors.

Loans are disaggregated into portfolio segments and further disaggregated into classes. The portfolio segment is the level at which the Company develops and documents a systematic method for determining its allowance for credit losses. Classes are a further disaggregation of portfolio segments based on the risk characteristics of the loans and the Company’s method for monitoring and assessing credit risk.
Loans and Allowances for Credit Losses, Allowances for Credit Losses [Policy Text Block]
Allowances for Credit Losses

BOK Financial maintains an allowance for loan losses and an accrual for off-balance sheet credit risk. The accrual for off-balance sheet credit risk is maintained at a level that is appropriate to cover estimated losses associated with credit instruments that are not currently recognized as assets such as loan commitments, standby letters of credit or guarantees. As discussed in greater detail in Note 6, the Company also has separate accruals for off-balance sheet credit risk related to residential mortgage loans previously sold with full or partial recourse and for residential mortgage loans sold to government sponsored agencies under standard representations and warranties.

The appropriateness of the allowance for loan losses and accrual for off-balance sheet credit losses (collectively "allowance for credit losses") is assessed by management based on an ongoing quarterly evaluation of the probable estimated losses inherent in the portfolio, including probable losses on both outstanding loans and unused commitments.

The allowance for loan losses consists of specific allowances attributed to impaired loans that have not yet been charged down to amounts we expect to recover, general allowances for unimpaired loans based on estimated loss rates by loan class and nonspecific allowances based on general economic conditions, risk concentration and related factors. There have been no material changes in the approach or techniques utilized in developing the allowance for loan losses and the accrual for off-balance sheet credit losses for the three and nine months ended September 30, 2019.

Loans are considered to be impaired when it becomes probable that BOK Financial will be unable to collect all amounts due according to the contractual terms of the loan agreements. Internally risk graded loans are evaluated individually for impairment. Substantially all commercial and commercial real estate loans and certain residential mortgage and consumer loans are risk graded based on evaluation of the borrowers' ability to repay. Certain commercial loans and most residential mortgage and consumer loans are small balance, homogeneous pools of loans that are not risk graded. Non-risk graded loans are identified as impaired based on performance status. Generally, non-risk graded loans 90 days or more past due or modified in a TDR or in bankruptcy are considered to be impaired.

Specific allowances for impaired loans are measured by an evaluation of estimated future cash flows discounted at the loans’ initial effective interest rate or the fair value of collateral for certain collateral dependent loans. Collateral value of real property is generally based on third party appraisals that conform to Uniform Standards of Professional Appraisal Practice, less estimated selling costs. Appraised values are on an "as-is" basis and are generally not adjusted by the Company. Updated appraisals are obtained at least annually or more frequently if market conditions indicate collateral values have declined. Collateral value of mineral rights is generally determined by our internal staff of engineers based on projected cash flows under current market conditions. Collateral values and available cash resources that support impaired loans are evaluated quarterly. Historical statistics may be used as a practical way to estimate impairment in limited situations, such as when a collateral dependent loan is identified as impaired at the end of a reporting period, until an updated appraisal of collateral value is received or a full assessment of future cash flows is completed. Estimates of future cash flows and collateral values require significant judgments and may be volatile.

General allowances for unimpaired loans are based on estimated loss rates by loan class. The gross loss rate for each loan class is determined by the greater of the current gross loss rate based on the most recent twelve months or a long-term gross loss rate. Recoveries are not directly considered in the estimation of loss rates. Recoveries generally do not follow predictable patterns and are not received until well after the charge-off date as a result of protracted legal actions. For risk graded loans, gross loss rates are adjusted for changes in risk grading. For each loan class, the current weighted average risk grade is compared to the long-term average risk grade. This comparison determines whether credit risk in each loan class is increasing or decreasing. Loss rates are adjusted upward or downward in proportion to changes in average risk grading. General allowances for unimpaired loans also consider inherent risks identified for each loan class. Inherent risks consider loss rates that most appropriately represent the current credit cycle and other factors attributable to specific loan classes which have not yet been represented in the gross loss rates or risk grading. These factors include changes in commodity prices or engineering imprecision, which may affect the value of reserves that secure our energy loan portfolio, construction risk that may affect commercial real estate loans, changes in regulations and public policy that may disproportionately impact health care loans and changes in loan products.

Nonspecific allowances are maintained for risks beyond factors specific to a particular loan or loan class. These factors include trends in the economy of our primary lending areas, concentrations in large balance loans and other relevant factors.

An accrual for off-balance sheet credit losses is included in Other liabilities in the Consolidated Balance Sheets. The appropriateness of this accrual is determined in the same manner as the allowance for loan losses.

A provision for credit losses is charged against or credited to earnings in amounts necessary to maintain an appropriate allowance for credit losses. Recoveries of loans previously charged off are added to the allowance when received.

Lessee, Leases [Policy Text Block]

Effective January 1, 2019, premises and equipment included right-of-use assets for leased office space and facilities. Leases are at market rates at inception and may contain escalations based on consumer price index or similar benchmarks and options to renew at then market rates. Renewal options, variable lease payments and residual value guarantees are included in the measurement of right-of-use assets when certain conditions are met. Lease component cash flows are discounted at the applicable FHLB advance rate.

Revenue [Policy Text Block]

Fees and commissions revenue is generated through the sales of products, consisting primarily of financial instruments, and the performance of services for customers under contractual obligations. Revenue from providing services for customers is recognized at the time services are provided in an amount that reflects the consideration we expect to be entitled to for those services. Revenue is recognized based on the application of five steps:
•
Identify the contract with a customer
•
Identify the performance obligations in the contract
•
Determine the transaction price
•
Allocate the transaction price to the performance obligations in the contract
•
Recognize revenue when (or as) the Company satisfies a performance obligation

For contracts with multiple performance obligations, individual performance obligations are accounted for separately if the customer can benefit from the good or service on its own or with other resources readily available to the customer and the promise to transfer goods and services to the customer is separately identifiable in the contract. The transaction price is allocated to the performance obligations based on relative standalone selling prices.

Revenue is recognized on a gross basis whenever we have primary responsibility and risk in providing the services or products to our customers and have discretion in establishing the price for the services or products. Revenue is recognized on a net basis whenever we act as an agent for products or services of others. 
 
Brokerage and trading revenue includes revenues from trading, customer hedging, retail brokerage and investment banking. Trading revenue includes net realized and unrealized gains primarily related to sales of securities to institutional customers and related derivative contracts. Customer hedging revenue includes realized and unrealized changes in the fair value of derivative contracts held for customer risk management programs including credit valuation adjustments, as necessary. We offer commodity, interest rate, foreign exchange and equity derivatives to our customers. These customer contracts are offset with contracts with selected counterparties and exchanges to minimize changes in market risk from changes in commodity prices, interest rates or foreign exchange rates. Retail brokerage revenue represents fees and commissions earned on sales of fixed income securities, annuities, mutual funds and other financial instruments to retail customers. Investment banking revenue includes fees earned upon completion of underwriting and financial advisory services. Investment banking revenue also includes fees earned in conjunction with loan syndications. Insurance brokerage revenues represents fees and commissions earned on placement of insurance products with carriers for property and casualty and health coverage.
 
Transaction card revenue includes merchant discount fees and electronic funds transfer network fees, net of interchange fees paid to card issuers and assessments paid to card networks. Merchant discount fees represent fees paid by customers for account management and electronic processing of card transactions. Merchant discount fees are recognized at the time the customer’s transactions are processed or other services are performed. The Company also maintains the TransFund electronic funds transfer network for the benefit of its members, which includes the Bank. Electronic funds transfer fees are recognized as electronic transactions processed on behalf of its members. 
 
Fiduciary and asset management revenue includes fees from asset management, custody, recordkeeping, investment advisory and administration services. Revenue is recognized on an accrual basis at the time the services are performed and may be based on either the fair value of the account or the service provided.
 
Deposit service charges and fees include commercial account service charges, overdraft fees, check card fee revenue and automated service charge and other deposit service fees. Fees are recognized at least quarterly in accordance with published deposit account agreements and disclosure statements for retail accounts or contractual agreements for commercial accounts. Item charges for overdraft or non-sufficient funds items are recognized as items are presented for payment. Account balance charges and activity fees are accrued monthly and collected in arrears. Commercial account activity fees may be offset by an earnings credit based on account balances. Check card fees represent interchange fees paid by a merchant bank for transactions processed from cards issued by the Company. Check card fees are recognized when transactions are processed.  

Mortgage banking revenue includes revenues recognized in conjunction with the origination, marketing and servicing of conventional and government-sponsored residential mortgage loans. Mortgage production revenue includes net realized gains (losses) on sales of residential mortgage loans in the secondary market and the net change in unrealized gains (losses) on residential mortgage loans held for sale. Mortgage production revenue also includes changes in the fair value of derivative contracts not designated as hedging instruments related to residential mortgage loan commitments and forward sales contracts. Mortgage servicing revenue includes servicing fee income and late charges on loans serviced for others.

v3.19.3
Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Marketable Securities [Abstract]  
Trading Securities, [Table Text Block]
The fair value and net unrealized gain (loss) included in trading securities are as follows (in thousands):
 
 
 
September 30, 2019
 
December 31, 2018
 
 
Fair Value
 
Net Unrealized Gain (Loss)
 
Fair Value
 
Net Unrealized Gain (Loss)
U.S. government agency debentures
 
$
63,334

 
$
23

 
$
63,765

 
$
254

Residential agency mortgage-backed securities
 
1,480,458

 
3,851

 
1,791,584

 
9,966

Municipal and other tax-exempt securities
 
44,105

 
(99
)
 
34,507

 
(1
)
Asset-backed securities
 
36,928

 
50

 
42,656

 
685

Other debt securities
 
50,387

 
116

 
24,411

 
65

Total trading securities
 
$
1,675,212

 
$
3,941

 
$
1,956,923

 
$
10,969
Investment Securities (Held-to-Maturity) [Table Text Block]
The amortized cost and fair values of investment securities are as follows (in thousands):

 
 
September 30, 2019
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
Municipal and other tax-exempt
 
$
104,418

 
$
107,647

 
$
3,247

 
$
(18
)
Residential agency mortgage-backed securities
 
11,125

 
11,650

 
528

 
(3
)
Other debt securities
 
188,681

 
204,724

 
16,457

 
(414
)
Total investment securities
 
$
304,224

 
$
324,021

 
$
20,232

 
$
(435
)

 
 
December 31, 2018
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
Municipal and other tax-exempt
 
$
137,296

 
$
138,562

 
$
1,858

 
$
(592
)
Residential agency mortgage-backed securities
 
12,612

 
12,770

 
293

 
(135
)
Other debt securities
 
205,279

 
215,966

 
12,257

 
(1,570
)
Total investment securities
 
$
355,187

 
$
367,298

 
$
14,408

 
$
(2,297
)



The amortized cost and fair values of investment securities at September 30, 2019, by contractual maturity, are as shown in the following table (dollars in thousands):
 
 
Less than
One Year
 
One to
Five Years
 
Six to
Ten Years
 
Over
Ten Years
 
Total
 
Weighted
Average
Maturity1
Fixed maturity debt securities:
 
 

 
 

 
 

 
 

 
 

 
 
Amortized cost
 
$
42,266

 
$
93,139

 
$
145,046

 
$
12,648

 
$
293,099

 
5.16

Fair value
 
42,426

 
96,704

 
160,698

 
12,543

 
312,371

 
 

Residential mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 
 

Amortized cost
 
 

 
 

 
 

 
 

 
$
11,125

 
2 
Fair value
 
 

 
 

 
 

 
 

 
11,650

 
 

Total investment securities:
 
 

 
 

 
 

 
 

 
 

 
 

Amortized cost
 
 

 
 

 
 

 
 

 
$
304,224

 
 

Fair value
 
 

 
 

 
 

 
 

 
324,021

 
 

1 
Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
2 
The average expected lives of residential mortgage-backed securities were 4.5 years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities
(in thousands):
 
 
September 30, 2019
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Investment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal and other tax-exempt
 
18

 
$
10,302

 
$
3

 
$
2,213

 
$
15

 
$
12,515

 
$
18

Residential agency mortgage-backed securities
 
1

 
2,318

 
3

 
—

 
—

 
2,318

 
3

Other debt securities
 
18

 
275

 
1

 
10,897

 
413

 
11,172

 
414

Total investment securities
 
37

 
$
12,895

 
$
7

 
$
13,110

 
$
428

 
$
26,005

 
$
435


 
 
December 31, 2018
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Investment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal and other tax-exempt
 
72

 
$
18,255

 
$
69

 
$
66,141

 
$
523

 
$
84,396

 
$
592

Residential agency mortgage-backed securities
 
2

 
—

 
—

 
5,633

 
135

 
5,633

 
135

Other debt securities
 
72

 
13,372

 
64

 
23,028

 
1,506

 
36,400

 
1,570

Total investment securities
 
146

 
$
31,627

 
$
133

 
$
94,802

 
$
2,164

 
$
126,429

 
$
2,297
Available For Sale Securities [Table Text Block]
The amortized cost and fair value of available for sale securities are as follows (in thousands):
 
 
September 30, 2019
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
U.S. Treasury
 
$
2,294

 
$
2,296

 
$
2

 
$
—

Municipal and other tax-exempt
 
1,772

 
1,848

 
76

 
—

Mortgage-backed securities:
 
 

 
 

 
 

 
 

Residential agency
 
7,636,923

 
7,740,461

 
114,646

 
(11,108
)
Residential non-agency
 
28,814

 
44,803

 
15,989

 
—

Commercial agency
 
3,176,188

 
3,234,671

 
61,003

 
(2,520
)
Other debt securities
 
500

 
472

 
—

 
(28
)
Total available for sale securities
 
$
10,846,491

 
$
11,024,551

 
$
191,716

 
$
(13,656
)

 
 
December 31, 2018
 
 
Amortized
 
Fair
 
Gross Unrealized
 
 
Cost
 
Value
 
Gain
 
Loss
U.S. Treasury
 
$
496

 
$
493

 
$
—

 
$
(3
)
Municipal and other tax-exempt
 
2,782

 
2,864

 
82

 
—

Mortgage-backed securities:
 
 
 
 

 
 

 
 

Residential agency
 
5,886,323

 
5,804,708

 
16,149

 
(97,764
)
Residential non-agency
 
40,948

 
59,736

 
18,788

 
—

Commercial agency
 
2,986,297

 
2,953,889

 
7,955

 
(40,363
)
Other debt securities
 
35,545

 
35,430

 
12

 
(127
)
Total available for sale securities
 
$
8,952,391

 
$
8,857,120

 
$
42,986

 
$
(138,257
)


The amortized cost and fair values of available for sale securities at September 30, 2019, by contractual maturity, are as shown in the following table (dollars in thousands):
 
Less than
One Year
 
One to
Five Years
 
Six to
Ten Years
 
Over
Ten Years
 
Total
 
Weighted
Average
Maturity1
Fixed maturity debt securities:
 
 
 
 
 
 
 
 
 
 
 
Amortized cost
$
35,845

 
$
1,069,415

 
$
1,476,121

 
$
599,373

 
$
3,180,754

 
8.29

Fair value
35,806

 
1,081,571

 
1,512,308

 
609,602

 
3,239,287

 
 
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Amortized cost
 
 
 
 
 
 
 
 
$
7,665,737

 
2 
Fair value
 
 
 
 
 
 
 
 
7,785,264

 
 
Total available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
Amortized cost
 
 
 
 
 
 
 
 
$
10,846,491

 
 
Fair value
 
 
 
 
 
 
 
 
11,024,551

 
 
1 
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
2 
The average expected lives of residential mortgage-backed securities were 4.0 years based upon current prepayment assumptions.

Sales of available for sale securities resulted in gains and losses as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Proceeds
$
261,028

 
$
45,293

 
$
628,385

 
$
232,826

Gross realized gains
989

 
250

 
7,316

 
700

Gross realized losses
(984
)
 
—

 
(6,206
)
 
(1,502
)
Related federal and state income tax expense (benefit)
1

 
64

 
282

 
(204
)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]

Temporarily Impaired Available for Sale Securities
(in thousands)
 
 
September 30, 2019
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Available for sale:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury
 
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Mortgage-backed securities:
 
 
 
 

 
 

 
 

 
 

 


 


Residential agency
 
108


931,248


3,260


753,448


7,848


1,684,696


11,108

Commercial agency
 
57

 
449,798

 
1,612

 
224,409

 
908

 
674,207

 
2,520

Other debt securities
 
1

 
—

 
—

 
472

 
28

 
472

 
28

Total available for sale securities
 
166

 
$
1,381,046


$
4,872


$
978,329


$
8,784


$
2,359,375


$
13,656



 
 
December 31, 2018
 
 
Number of Securities
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
 
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Available for sale:
 
 

 
 

 
 

 
 

 
 

 


 


U.S. Treasury
 
1

 
$
—

 
$
—

 
$
493

 
$
3

 
$
493

 
$
3

Mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 


 


Residential agency
 
289

 
510,824

 
1,158

 
3,641,370

 
96,606

 
4,152,194

 
97,764

Commercial agency
 
197

 
179,258

 
394

 
1,969,504

 
39,969

 
2,148,762

 
40,363

Other debt securities
 
3

 
9,982

 
63

 
20,436

 
64

 
30,418

 
127

Total available for sale securities
 
490

 
$
700,064


$
1,615


$
5,631,803


$
136,642


$
6,331,867


$
138,257
Fair Value Option Securities [Table Text Block]
The fair value and net unrealized gain (loss) included in fair value option securities is as follows (in thousands):
 
 
September 30, 2019
 
December 31, 2018
 
 
Fair Value
 
Net Unrealized Gain (Loss)
 
Fair Value
 
Net Unrealized Gain (Loss)
U.S. Treasury
 
$
552,536

 
$
927

 
$
—

 
$
—

Residential agency mortgage-backed securities
 
1,263,862

 
18,588

 
283,235

 
2,766

Total
 
$
1,816,398

 
$
19,515

 
$
283,235

 
$
2,766
v3.19.3
Derivatives (Tables)
 9 Months Ended
Sep. 30, 2019
Derivative Instrument Detail [Abstract]  
Derivative Contracts [Table Text Block]
The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at September 30, 2019 (in thousands):
 
 
Assets
 
 
Notional1
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest rate swaps
 
2,399,788

 
67,157

 
(240
)
 
66,917

 
(277
)
 
66,640

Energy contracts
 
1,980,406

 
183,204

 
(59,139
)
 
124,065

 
(66,149
)
 
57,916

Agricultural contracts
 
15,538

 
470

 
(302
)
 
168

 
—

 
168

Foreign exchange contracts
 
209,515

 
206,914

 
—

 
206,914

 
—

 
206,914

Equity option contracts
 
82,860

 
3,114

 
—

 
3,114

 
(660
)
 
2,454

Total customer risk management programs
 
4,688,107

 
460,859

 
(59,681
)
 
401,178

 
(67,086
)
 
334,092

Trading
 
73,658,685

 
205,188

 
(193,306
)
 
11,882

 
—

 
11,882

Internal risk management programs
 
433,804

 
9,037

 
(2,992
)
 
6,045

 
—

 
6,045

Total derivative contracts
 
$
78,780,596

 
$
675,084

 
$
(255,979
)
 
$
419,105

 
$
(67,086
)
 
$
352,019

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
Notional¹
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest rate swaps
 
2,399,788

 
67,296

 
(240
)
 
67,056

 
(61,563
)
 
5,493

Energy contracts
 
1,936,369

 
175,613

 
(59,139
)
 
116,474

 
(784
)
 
115,690

Agricultural contracts
 
15,547

 
451

 
(302
)
 
149

 
—

 
149

Foreign exchange contracts
 
200,347

 
197,807

 
—

 
197,807

 
(433
)
 
197,374

Equity option contracts
 
82,860

 
3,114

 
—

 
3,114

 
—

 
3,114

Total customer risk management programs
 
4,634,911

 
444,281

 
(59,681
)
 
384,600

 
(62,780
)
 
321,820

Trading
 
75,247,769

 
207,542

 
(193,306
)
 
14,236

 
—

 
14,236

Internal risk management programs
 
483,370

 
5,435

 
(2,992
)
 
2,443

 
(1,708
)
 
735

Total derivative contracts
 
$
80,366,050

 
$
657,258

 
$
(255,979
)
 
$
401,279

 
$
(64,488
)
 
$
336,791

1 
Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.


The following table summarizes the fair values of derivative contracts recorded as “derivative contracts” assets and liabilities in the balance sheet at December 31, 2018 (in thousands):

 
 
Assets
 
 
Notional 1
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
10,671,151

 
$
92,231

 
$
(26,787
)
 
$
65,444

 
$
—

 
$
65,444

Interest rate swaps
 
1,924,131

 
36,112

 
(6,688
)
 
29,424

 
(7,934
)
 
21,490

Energy contracts
 
1,472,209

 
206,418

 
(60,983
)
 
145,435

 
(106,752
)
 
38,683

Agricultural contracts
 
21,210

 
842

 
(201
)
 
641

 
—

 
641

Foreign exchange contracts
 
184,990

 
183,759

 
—

 
183,759

 
—

 
183,759

Equity option contracts
 
89,085

 
2,021

 
—

 
2,021

 
(648
)
 
1,373

Total customer risk management programs
 
14,362,776

 
521,383

 
(94,659
)
 
426,724

 
(115,334
)
 
311,390

Trading
 
15,356,909

 
45,346

 
(39,521
)
 
5,825

 
—

 
5,825

Internal risk management programs
 
553,079

 
5,064

 
(1,350
)
 
3,714

 
—

 
3,714

Total derivative contracts
 
$
30,272,764

 
$
571,793

 
$
(135,530
)
 
$
436,263

 
$
(115,334
)
 
$
320,929

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
 
 
Notional 1
 
Gross Fair Value
 
Netting Adjustments
 
Net Fair Value Before Cash Collateral
 
Cash Collateral
 
Fair Value Net of Cash Collateral
Customer risk management programs:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
10,558,151

 
$
90,388

 
$
(26,787
)
 
$
63,601

 
$
(63,596
)
 
$
5

Interest rate swaps
 
1,924,131

 
36,288

 
(6,688
)
 
29,600

 
(4,110
)
 
25,490

Energy contracts
 
1,434,247

 
202,494

 
(60,983
)
 
141,511

 
(1,490
)
 
140,021

Agricultural contracts
 
21,214

 
812

 
(201
)
 
611

 
—

 
611

Foreign exchange contracts
 
177,423

 
175,922

 
—

 
175,922

 
—

 
175,922

Equity option contracts
 
89,085

 
2,021

 
—

 
2,021

 
—

 
2,021

Total customer risk management programs
 
14,204,251

 
507,925

 
(94,659
)
 
413,266

 
(69,196
)
 
344,070

Trading
 
19,374,294

 
56,983

 
(39,521
)
 
17,462

 
—

 
17,462

Internal risk management programs
 
260,348

 
9,439

 
(1,350
)
 
8,089

 
(7,315
)
 
774

Total derivative contracts
 
$
33,838,893

 
$
574,347

 
$
(135,530
)
 
$
438,817

 
$
(76,511
)
 
$
362,306

1 
Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
Derivative Instruments, Gain (Loss) in Statement of Earnings [Table Text Block]
The following summarizes the pre-tax net gains (losses) on derivative instruments and where they are recorded in the income statement (in thousands):
 
 
Three Months Ended
 
 
September 30, 2019
 
September 30, 2018
 
 
Brokerage
and Trading Revenue
 
Gain (Loss) on Derivatives, Net
 
Brokerage
and Trading
Revenue
 
Gain (Loss)on Derivatives, Net
Customer risk management programs:
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
1,667

 
$
—

 
$
7,272

 
$
—

Interest rate swaps
 
1,252

 
—

 
618

 
—

Energy contracts
 
1,611

 
—

 
541

 
—

Agricultural contracts
 
16

 
—

 
6

 
—

Foreign exchange contracts
 
138

 
—

 
78

 
—

Equity option contracts
 
—

 
—

 
—

 
—

Total customer risk management programs
 
4,684

 
—

 
8,515

 
—

Trading
 
3,630

 
—

 
6,124

 
—

Internal risk management programs
 
—

 
3,778

 
—

 
(2,847
)
Total derivative contracts
 
$
8,314

 
$
3,778

 
$
14,639

 
$
(2,847
)


 
 
Nine Months Ended
 
 
September 30, 2019
 
September 30, 2018
 
 
Brokerage
and Trading Revenue
 
Gain (Loss) on Derivatives, Net
 
Brokerage
and Trading
Revenue
 
Gain (Loss) on Derivatives, Net
Customer risk management programs:
 
 
 
 
 
 
 
 
Interest rate contracts
 
 
 
 
 
 
 
 
To-be-announced residential mortgage-backed securities
 
$
9,579

 
$
—

 
$
21,677

 
$
—

Interest rate swaps
 
2,787

 
—

 
2,057

 
—

Energy contracts
 
3,923

 
—

 
5,097

 
—

Agricultural contracts
 
24

 
—

 
36

 
—

Foreign exchange contracts
 
392

 
—

 
350

 
—

Equity option contracts
 
—

 
—

 
—

 
—

Total customer risk management programs
 
16,705

 
—

 
29,217

 
—

Trading
 
4,365

 
—

 
3,260

 
—

Internal risk management programs
 
—

 
19,595

 
—

 
(11,589
)
Total derivative contracts
 
$
21,070

 
$
19,595

 
$
32,477

 
$
(11,589
)
v3.19.3
Loans and Allowances for Credit Losses (Tables)
 9 Months Ended
Sep. 30, 2019
Loans and Leases Receivable, Net Amount [Abstract]  
Schedule of Loans by Portfolio Segment [Table Text Block]
Portfolio segments of the loan portfolio are as follows (in thousands):

 
 
September 30, 2019
 
December 31, 2018
 
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
 
Fixed
Rate
 
Variable
Rate
 
Non-accrual
 
Total
Commercial
 
$
3,184,237

 
$
11,128,682

 
$
111,706

 
$
14,424,625

 
$
2,251,188

 
$
11,285,049

 
$
99,841

 
$
13,636,078

Commercial real estate
 
1,070,050

 
3,532,822

 
23,185

 
4,626,057

 
1,477,274

 
3,265,918

 
21,621

 
4,764,813

Residential mortgage
 
1,690,286

 
389,713

 
37,304

 
2,117,303

 
1,830,224

 
358,254

 
41,555

 
2,230,033

Personal
 
191,827

 
925,284

 
271

 
1,117,382

 
190,687

 
834,889

 
230

 
1,025,806

Total
 
$
6,136,400

 
$
15,976,501

 
$
172,466

 
$
22,285,367

 
$
5,749,373

 
$
15,744,110

 
$
163,247

 
$
21,656,730

Accruing loans past due (90 days)1
 
 

 
 

 
 

 
$
1,541

 
 

 
 

 
 

 
$
1,338

1 
Excludes residential mortgage loans guaranteed by agencies of the U.S. government
Rollforward of Allowance For Loan Losses And Accrual for Off-Balance Sheet Credit Losses [Table Text Block]
The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended September 30, 2019 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
106,397

 
$
54,188

 
$
15,724

 
$
9,388

 
$
16,837

 
$
202,534

Provision for loan losses
 
9,861

 
102

 
(253
)
 
1,911

 
918

 
12,539

Loans charged off
 
(9,875
)
 
—

 
(56
)
 
(1,776
)
 
—

 
(11,707
)
Recoveries
 
260

 
60

 
119

 
627

 
—

 
1,066

Ending balance
 
$
106,643

 
$
54,350

 
$
15,534

 
$
10,150

 
$
17,755

 
$
204,432

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
1,742

 
$
116

 
$
44

 
$
1

 
$
—

 
$
1,903

Provision for off-balance sheet credit losses
 
(536
)
 
(3
)
 
—

 
—

 
—

 
(539
)
Ending balance
 
$
1,206

 
$
113

 
$
44

 
$
1

 
$
—

 
$
1,364

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
9,325

 
$
99

 
$
(253
)
 
$
1,911

 
$
918

 
$
12,000



The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the nine months ended September 30, 2019 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
102,226

 
$
60,026

 
$
17,964

 
$
9,473

 
$
17,768

 
$
207,457

Provision for loan losses
 
34,740

 
(10,075
)
 
(2,660
)
 
3,434

 
(13
)
 
25,426

Loans charged off
 
(31,728
)
 
(118
)
 
(192
)
 
(4,671
)
 
—

 
(36,709
)
Recoveries
 
1,405

 
4,517

 
422

 
1,914

 
—

 
8,258

Ending balance
 
$
106,643

 
$
54,350

 
$
15,534

 
$
10,150

 
$
17,755

 
$
204,432

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
1,655

 
$
52

 
$
52

 
$
31

 
$
—

 
$
1,790

Provision for off-balance sheet credit losses
 
(449
)
 
61

 
(8
)
 
(30
)
 
—

 
(426
)
Ending balance
 
$
1,206

 
$
113

 
$
44

 
$
1

 
$
—

 
$
1,364

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
34,291

 
$
(10,014
)
 
$
(2,668
)
 
$
3,404

 
$
(13
)
 
$
25,000


The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended September 30, 2018 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
113,722

 
$
58,758

 
$
18,544

 
$
8,646

 
$
15,472

 
$
215,142

Provision for loan losses
 
(1,285
)
 
1,391

 
1

 
883

 
3,418

 
4,408

Loans charged off
 
(9,602
)
 
—

 
(91
)
 
(1,380
)
 
—

 
(11,073
)
Recoveries
 
1,263

 
40

 
229

 
560

 
—

 
2,092

Ending balance
 
$
104,098

 
$
60,189

 
$
18,683

 
$
8,709

 
$
18,890

 
$
210,569

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
2,361

 
17

 
53

 
2

 
—

 
$
2,433

Provision for off-balance sheet credit losses
 
(424
)
 
19

 
(3
)
 
—

 
—

 
(408
)
Ending balance
 
$
1,937

 
$
36

 
$
50

 
$
2

 
$
—

 
$
2,025

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
(1,709
)
 
$
1,410

 
$
(2
)
 
$
883

 
$
3,418

 
$
4,000



The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the nine months ended September 30, 2018 is summarized as follows (in thousands):
 
 
Commercial
 
Commercial Real Estate
 
Residential Mortgage
 
Personal
 
Nonspecific Allowance
 
Total
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
124,269

 
$
56,621

 
$
18,451

 
$
9,124

 
$
22,217

 
$
230,682

Provision for loan losses
 
2,720

 
248

 
(418
)
 
1,486

 
(3,327
)
 
709

Loans charged off
 
(24,940
)
 
—

 
(326
)
 
(3,802
)
 
—

 
(29,068
)
Recoveries
 
2,049

 
3,320

 
976

 
1,901

 
—

 
8,246

Ending balance
 
$
104,098

 
$
60,189

 
$
18,683

 
$
8,709

 
$
18,890

 
$
210,569

Allowance for off-balance sheet credit losses:
 
 

 
 

 
 

 
 

 
 

 
 

Beginning balance
 
$
3,644

 
$
45

 
$
43

 
$
2

 
$
—

 
$
3,734

Provision for off-balance sheet credit losses
 
(1,707
)
 
(9
)
 
7

 
—

 
—

 
(1,709
)
Ending balance
 
$
1,937

 
$
36

 
$
50

 
$
2

 
$
—

 
$
2,025

 
 
 
 
 
 
 
 
 
 
 
 
 
Total provision for credit losses
 
$
1,013

 
$
239

 
$
(411
)
 
$
1,486

 
$
(3,327
)
 
$
(1,000
)

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at September 30, 2019 is as follows (in thousands):
 
 
Collectively Measured
for Impairment
 
Individually Measured
for Impairment
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
14,312,919

 
$
99,110

 
$
111,706

 
$
7,533

 
$
14,424,625

 
$
106,643

Commercial real estate
 
4,602,872

 
54,350

 
23,185

 
—

 
4,626,057

 
54,350

Residential mortgage
 
2,079,999

 
15,534

 
37,304

 
—

 
2,117,303

 
15,534

Personal
 
1,117,111

 
10,150

 
271

 
—

 
1,117,382

 
10,150

Total
 
22,112,901

 
179,144

 
172,466

 
7,533

 
22,285,367

 
186,677

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,755

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
22,112,901

 
$
179,144

 
$
172,466

 
$
7,533

 
$
22,285,367

 
$
204,432


The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2018 is as follows (in thousands):
 
 
Collectively Measured
for Impairment
 
Individually Measured
for Impairment
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,536,237

 
$
93,494

 
$
99,841

 
$
8,732

 
$
13,636,078

 
$
102,226

Commercial real estate
 
4,743,192

 
60,026

 
21,621

 
—

 
4,764,813

 
60,026

Residential mortgage
 
2,188,478

 
17,964

 
41,555

 
—

 
2,230,033

 
17,964

Personal
 
1,025,576

 
9,473

 
230

 
—

 
1,025,806

 
9,473

Total
 
21,493,483

 
180,957

 
163,247

 
8,732

 
21,656,730

 
189,689

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,768

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,493,483

 
$
180,957

 
$
163,247

 
$
8,732

 
$
21,656,730

 
$
207,457
Schedule of Credit Quality Indicators [Table Text Block]
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at September 30, 2019 is as follows (in thousands):
 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
14,396,278

 
$
105,714

 
$
28,347

 
$
929

 
$
14,424,625

 
$
106,643

Commercial real estate
 
4,626,057

 
54,350

 
—

 
—

 
4,626,057

 
54,350

Residential mortgage
 
283,297

 
3,375

 
1,834,006

 
12,159

 
2,117,303

 
15,534

Personal
 
1,032,522

 
7,836

 
84,860

 
2,314

 
1,117,382

 
10,150

Total
 
20,338,154

 
171,275

 
1,947,213

 
15,402

 
22,285,367

 
186,677

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,755

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
20,338,154

 
$
171,275

 
$
1,947,213

 
$
15,402

 
$
22,285,367

 
$
204,432

 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2018 is as follows (in thousands):
 
 
Internally Risk Graded
 
Non-Graded
 
Total
 
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related Allowance
 
Recorded Investment
 
Related
Allowance
Commercial
 
$
13,586,654

 
$
101,303

 
$
49,424

 
$
923

 
$
13,636,078

 
$
102,226

Commercial real estate
 
4,764,813

 
60,026

 
—

 
—

 
4,764,813

 
60,026

Residential mortgage
 
505,046

 
3,310

 
1,724,987

 
14,654

 
2,230,033

 
17,964

Personal
 
948,890

 
6,633

 
76,916

 
2,840

 
1,025,806

 
9,473

Total
 
19,805,403

 
171,272

 
1,851,327

 
18,417

 
21,656,730

 
189,689

 
 
 
 
 
 
 
 
 
 
 
 
 
Nonspecific allowance
 
—

 
—

 
—

 
—

 
—

 
17,768

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,805,403

 
$
171,272

 
$
1,851,327

 
$
18,417

 
$
21,656,730

 
$
207,457

 
 
 
 
 
 
 
 
 
 
 
 
 


Loans are considered to be performing if they are in compliance with the original terms of the agreement and currently exhibit no factors that cause management to have doubts about the borrowers' ability to remain in compliance with the original terms of the agreement, which is consistent with the regulatory guideline of “pass.” Performing loans also include past due residential mortgages that are guaranteed by agencies of the U.S. government that continue to accrue interest based on criteria of the guarantors' programs. Other loans especially mentioned are currently performing in compliance with the original terms of the agreement but may have a potential weakness that deserves management’s close attention, consistent with regulatory guidelines. 

The risk grading process identified certain loans that have a well-defined weakness (e.g. inadequate debt service coverage or liquidity or marginal capitalization; repayment may depend on collateral or other risk mitigation) that may jeopardize liquidation of the debt and represent a greater risk due to deterioration in the financial condition of the borrower. This is consistent with the regulatory guideline for “substandard.” Because the borrowers are still performing in accordance with the original terms of the loan agreements, these loans were not placed in nonaccruing status. 

Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This is substantially the same criteria used to determine whether a loan is impaired and includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines.

The following table summarizes the Company’s loan portfolio at September 30, 2019 by the risk grade categories (in thousands): 
 
 
Internally Risk Graded
 
Non-Graded
 
 
 
 
Performing
 
 
 
 
 
 
 
 
 
 
Pass
 
Other Loans Especially Mentioned
 
Accruing Substandard
 
Nonaccrual
 
Performing
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,927,285

 
$
60,405

 
$
37,685

 
$
88,894

 
$
—

 
$
—

 
$
4,114,269

Services
 
3,185,367

 
38,118

 
36,645

 
6,119

 
—

 
—

 
3,266,249

Wholesale/retail
 
1,829,614

 
9,757

 
7,742

 
1,504

 
—

 
—

 
1,848,617

Manufacturing
 
652,804

 
24,229

 
12,634

 
8,741

 
—

 
—

 
698,408

Healthcare
 
2,984,306

 
25,205

 
17,479

 
5,978

 
—

 
—

 
3,032,968

Public finance
 
744,840

 
—

 
—

 
—

 
—

 
—

 
744,840

Other commercial and industrial
 
671,819

 
2,053

 
16,632

 
423

 
28,300

 
47

 
719,274

Total commercial
 
13,996,035

 
159,767

 
128,817

 
111,659

 
28,300

 
47

 
14,424,625

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Residential construction and land development
 
135,011

 
—

 
—

 
350

 
—

 
—

 
135,361

Retail
 
765,708

 
12,067

 
1,262

 
20,132

 
—

 
—

 
799,169

Office
 
1,007,136

 
5,203

 
1,081

 
855

 
—

 
—

 
1,014,275

Multifamily
 
1,316,856

 
1,196

 
6,501

 
286

 
—

 
—

 
1,324,839

Industrial
 
872,627

 
—

 
—

 
909

 
—

 
—

 
873,536

Other commercial real estate
 
474,465

 
784

 
2,975

 
653

 
—

 
—

 
478,877

Total commercial real estate
 
4,571,803

 
19,250

 
11,819

 
23,185

 
—

 
—

 
4,626,057

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Permanent mortgage
 
280,243

 
326

 
2,191

 
537

 
763,535

 
19,628

 
1,066,460

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
185,432

 
6,332

 
191,764

Home equity
 
—

 
—

 
—

 
—

 
848,272

 
10,807

 
859,079

Total residential mortgage
 
280,243

 
326

 
2,191

 
537

 
1,797,239

 
36,767

 
2,117,303

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,032,381

 
46

 
33

 
63

 
84,651

 
208

 
1,117,382

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,880,462

 
$
179,389

 
$
142,860

 
$
135,444

 
$
1,910,190

 
$
37,022

 
$
22,285,367



The following table summarizes the Company’s loan portfolio at December 31, 2018 by the risk grade categories (in thousands): 
 
 
Internally Risk Graded
 
Non-Graded
 
 
 
 
Performing
 
 
 
 
 
 
 
 
 
 
Pass
 
Other Loans Especially Mentioned
 
Accruing Substandard
 
Nonaccrual
 
Performing
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,414,039

 
$
42,176

 
$
86,624

 
$
47,494

 
$
—

 
$
—

 
$
3,590,333

Services
 
3,167,203

 
49,761

 
32,661

 
8,567

 
—

 
—

 
3,258,192

Wholesale/retail
 
1,593,902

 
18,809

 
7,131

 
1,316

 
—

 
—

 
1,621,158

Manufacturing
 
668,438

 
30,934

 
22,230

 
8,919

 
—

 
—

 
730,521

Healthcare
 
2,730,121

 
14,920

 
37,698

 
16,538

 
—

 
—

 
2,799,277

Public finance
 
804,550

 
—

 
—

 
—

 
—

 
—

 
804,550

Other commercial and industrial
 
756,815

 
1,266

 
7,588

 
16,954

 
49,371

 
53

 
832,047

Total commercial
 
13,135,068

 
157,866

 
193,932

 
99,788

 
49,371

 
53

 
13,636,078

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Residential construction and land development
 
148,234

 
—

 
—

 
350

 
—

 
—

 
148,584

Retail
 
885,588

 
11,926

 
1,289

 
20,279

 
—

 
—

 
919,082

Office
 
1,059,334

 
10,532

 
3,054

 
—

 
—

 
—

 
1,072,920

Multifamily
 
1,287,471

 
281

 
12

 
301

 
—

 
—

 
1,288,065

Industrial
 
776,898

 
—

 
1,208

 
—

 
—

 
—

 
778,106

Other commercial real estate
 
555,301

 
1,188

 
876

 
691

 
—

 
—

 
558,056

Total commercial real estate
 
4,712,826

 
23,927

 
6,439

 
21,621

 
—

 
—

 
4,764,813

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 
 
 

 
 

 
 

 
 

 
 

Permanent mortgage
 
269,678

 
52

 
9,730

 
1,991

 
819,199

 
21,960

 
1,122,610

Permanent mortgages guaranteed by U.S. government agencies
 
—

 
—

 
—

 
—

 
183,734

 
7,132

 
190,866

Home equity
 
223,298

 
—

 
296

 
—

 
682,491

 
10,472

 
916,557

Total residential mortgage
 
492,976

 
52

 
10,026

 
1,991

 
1,685,424

 
39,564

 
2,230,033

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
944,256

 
115

 
4,443

 
76

 
76,762

 
154

 
1,025,806

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
19,285,126

 
$
181,960

 
$
214,840

 
$
123,476

 
$
1,811,557

 
$
39,771

 
$
21,656,730
Summary of Impaired Loans [Table Text Block]
Impaired Loans

Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreement. This generally includes all nonaccruing loans, all loans modified in a TDR and all loans repurchased from GNMA pools.

A summary of impaired loans at September 30, 2019 follows (in thousands):
 
As of
 
For the
 
For the
 
September 30, 2019
 
Three Months Ended
 
Nine Months Ended
 
 
 
Recorded Investment
 
 
 
September 30, 2019
 
September 30, 2019
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
 
Average Recorded
Investment
 
Interest Income Recognized
 
Average Recorded
Investment
 
Interest Income Recognized
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Energy
$
139,897

 
$
88,894

 
$
62,981

 
$
25,913

 
$
7,176

 
$
80,263

 
$
—

 
$
67,705

 
$
—

Services
9,390

 
6,119

 
6,093

 
26

 
26

 
8,103

 
—

 
5,172

 
—

Wholesale/retail
1,718

 
1,504

 
1,243

 
261

 
101

 
1,447

 
—

 
1,087

 
—

Manufacturing1
9,153

 
8,741

 
8,511

 
230

 
230

 
8,677

 
—

 
8,448

 
—

Healthcare
17,786

 
5,978

 
5,978

 
—

 
—

 
11,063

 
—

 
8,547

 
—

Public finance
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
8,261

 
470

 
470

 
—

 
—

 
7,998

 
—

 
8,585

 
—

Total commercial
186,205

 
111,706

 
85,276

 
26,430

 
7,533

 
117,551

 
—

 
99,544

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Residential construction and land development
1,306

 
350

 
350

 
—

 
—

 
350

 
—

 
350

 
—

Retail
20,516

 
20,132

 
20,132

 
—

 
—

 
20,094

 
—

 
20,206

 
—

Office
855

 
855

 
855

 
—

 
—

 
855

 
—

 
427

 
—

Multifamily
286

 
286

 
286

 
—

 
—

 
281

 
—

 
294

 
—

Industrial
909

 
909

 
909

 
—

 
—

 
454

 
—

 
454

 
—

Other commercial real estate
813

 
653

 
653

 
—

 
—

 
393

 
—

 
672

 
—

Total commercial real estate
24,685

 
23,185

 
23,185

 
—

 
—

 
22,427

 
—

 
22,403

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Permanent mortgage
24,639

 
20,165

 
20,165

 
—

 
—

 
20,984

 
280

 
22,058

 
894

Permanent mortgage guaranteed by U.S. government agencies2
197,847

 
191,764

 
191,764

 
—

 
—

 
196,310

 
2,020

 
194,751

 
5,863

Home equity
12,621

 
10,807

 
10,807

 
—

 
—

 
10,369

 
—

 
10,639

 
—

Total residential mortgage
235,107

 
222,736

 
222,736

 
—

 
—

 
227,663

 
2,300

 
227,448

 
6,757

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
338

 
271

 
271

 
—

 
—

 
254

 
—

 
251

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
$
446,335

 
$
357,898

 
$
331,468

 
$
26,430

 
$
7,533

 
$
367,895

 
$
2,300

 
$
349,646

 
$
6,757

1 
Impaired manufacturing sector loans included $4.7 million of loans from an affiliated entity, with no allowance as the fair value of the collateral exceeded the outstanding principal balance at September 30, 2019.
2 All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At September 30, 2019, the majority were accruing based on the guarantee by U.S. government agencies.


Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, are recovered.

A summary of impaired loans at December 31, 2018 follows (in thousands): 
 
 
 
 
Recorded Investment
 
 
Unpaid
Principal
Balance
 
Total
 
With No
Allowance
 
With Allowance
 
Related Allowance
Commercial:
 
 
 
 
 
 
 
 
 
 
Energy
 
$
79,675

 
$
47,494

 
$
18,639

 
$
28,855

 
$
5,362

Services
 
13,437

 
8,567

 
8,489

 
78

 
74

Wholesale/retail
 
1,722

 
1,316

 
1,015

 
301

 
101

Manufacturing
 
10,055

 
8,919

 
8,673

 
246

 
246

Healthcare
 
24,319

 
16,538

 
10,563

 
5,975

 
2,949

Public finance
 
—

 
—

 
—

 
—

 
—

Other commercial and industrial
 
26,955

 
17,007

 
17,007

 
—

 
—

Total commercial
 
156,163

 
99,841

 
64,386

 
35,455

 
8,732

 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 

 
 

 
 

Residential construction and land development
 
1,306

 
350

 
350

 
—

 
—

Retail
 
27,680

 
20,279

 
20,279

 
—

 
—

Office
 
—

 
—

 
—

 
—

 
—

Multifamily
 
301

 
301

 
301

 
—

 
—

Industrial
 
—

 
—

 
—

 
—

 
—

Other commercial real estate
 
851

 
691

 
691

 
—

 
—

Total commercial real estate
 
30,138

 
21,621

 
21,621

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 

 
 

 
 

Permanent mortgage
 
28,716

 
23,951

 
23,951

 
—

 
—

Permanent mortgage guaranteed by U.S. government agencies1
 
196,296

 
190,866

 
190,866

 
—

 
—

Home equity
 
12,196

 
10,472

 
10,472

 
—

 
—

Total residential mortgage
 
237,208

 
225,289

 
225,289

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
Personal
 
278

 
230

 
230

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
Total
 
$
423,787

 
$
346,981

 
$
311,526

 
$
35,455

 
$
8,732

1 
All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2018, the majority were accruing based on the guarantee by U.S. government agencies.
Summary of Loans by Aging Status [Table Text Block]
A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of September 30, 2019 is as follows (in thousands):
 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89 Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
4,025,375

 
$
—

 
$
—

 
$
—

 
$
88,894

 
$
4,114,269

Services
 
3,249,994

 
7,305

 
2,096

 
735

 
6,119

 
3,266,249

Wholesale/retail
 
1,844,203

 
2,910

 
—

 
—

 
1,504

 
1,848,617

Manufacturing
 
687,358

 
2,309

 
—

 
—

 
8,741

 
698,408

Healthcare
 
3,026,838

 
94

 
2

 
56

 
5,978

 
3,032,968

Public finance
 
744,840

 
—

 
—

 
—

 
—

 
744,840

Other commercial and industrial
 
718,419

 
337

 
48

 
—

 
470

 
719,274

Total commercial
 
14,297,027

 
12,955

 
2,146

 
791

 
111,706

 
14,424,625

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
134,947

 
—

 
—

 
64

 
350

 
135,361

Retail
 
779,037

 
—

 
—

 
—

 
20,132

 
799,169

Office
 
1,013,420

 
—

 
—

 
—

 
855

 
1,014,275

Multifamily
 
1,318,148

 
6,405

 
—

 
—

 
286

 
1,324,839

Industrial
 
872,627

 
—

 
—

 
—

 
909

 
873,536

Other commercial real estate
 
477,126

 
335

 
106

 
657

 
653

 
478,877

Total commercial real estate
 
4,595,305

 
6,740

 
106

 
721

 
23,185

 
4,626,057

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,036,793

 
6,097

 
3,405

 
—

 
20,165

 
1,066,460

Permanent mortgages guaranteed by U.S. government agencies
 
47,207

 
23,412

 
21,676

 
93,137

 
6,332

 
191,764

Home equity
 
845,616

 
2,282

 
374

 
—

 
10,807

 
859,079

Total residential mortgage
 
1,929,616

 
31,791

 
25,455

 
93,137

 
37,304

 
2,117,303

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,116,888

 
100

 
94

 
29

 
271

 
1,117,382

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,938,836

 
$
51,586

 
$
27,801

 
$
94,678

 
$
172,466

 
$
22,285,367


A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2018 is as follows (in thousands):

 
 
 
 
Past Due
 
 
 
 
 
 
Current
 
30 to 59
Days
 
60 to 89 Days
 
90 Days
or More
 
Nonaccrual
 
Total
Commercial:
 
 
 
 
 
 
 
 
 
 
 
 
Energy
 
$
3,542,839

 
$
—

 
$
—

 
$
—

 
$
47,494

 
$
3,590,333

Services
 
3,237,578

 
6,009

 
6,038

 
—

 
8,567

 
3,258,192

Wholesale/retail
 
1,619,290

 
515

 
37

 
—

 
1,316

 
1,621,158

Manufacturing
 
721,204

 
392

 
6

 
—

 
8,919

 
730,521

Healthcare
 
2,781,944

 
241

 
—

 
554

 
16,538

 
2,799,277

Public finance
 
804,550

 
—

 
—

 
—

 
—

 
804,550

Other commercial and industrial
 
814,489

 
518

 
25

 
8

 
17,007

 
832,047

Total commercial
 
13,521,894

 
7,675

 
6,106

 
562

 
99,841

 
13,636,078

 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial real estate:
 
 

 
 

 
 
 
 

 
 

 
 

Residential construction and land development
 
147,705

 
249

 
280

 
—

 
350

 
148,584

Retail
 
884,424

 
14,379

 
—

 
—

 
20,279

 
919,082

Office
 
1,072,920

 
—

 
—

 
—

 
—

 
1,072,920

Multifamily
 
1,287,483

 
281

 
—

 
—

 
301

 
1,288,065

Industrial
 
776,898

 
1,208

 
—

 
—

 
—

 
778,106

Other commercial real estate
 
556,239

 
412

 
—

 
714

 
691

 
558,056

Total commercial real estate
 
4,725,669

 
16,529

 
280

 
714

 
21,621

 
4,764,813

 
 
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage:
 
 

 
 

 
 
 
 

 
 

 
 

Permanent mortgage
 
1,095,097

 
3,196

 
366

 
—

 
23,951

 
1,122,610

Permanent mortgages guaranteed by U.S. government agencies
 
37,459

 
24,369

 
16,345

 
105,561

 
7,132

 
190,866

Home equity
 
904,572

 
1,102

 
352

 
59

 
10,472

 
916,557

Total residential mortgage
 
2,037,128

 
28,667

 
17,063

 
105,620

 
41,555

 
2,230,033

 
 
 
 
 
 
 
 
 
 
 
 
 
Personal
 
1,024,298

 
479

 
796

 
3

 
230

 
1,025,806

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
21,308,989

 
$
53,350

 
$
24,245

 
$
106,899

 
$
163,247

 
$
21,656,730
v3.19.3
Mortgage Banking Activities (Tables)
 9 Months Ended
Sep. 30, 2019
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 
 
September 30, 2019
 
December 31, 2018
 
 
Unpaid Principal Balance/
Notional
 
Fair Value
 
Unpaid Principal Balance/
Notional
 
Fair Value
Residential mortgage loans held for sale
 
$
269,610

 
$
272,489

 
$
145,057

 
$
146,971

Residential mortgage loan commitments
 
379,377

 
10,111

 
160,848

 
5,378

Forward sales contracts
 
649,161

 
(113
)
 
274,000

 
(3,128
)
 
 
 

 
$
282,487

 
 

 
$
149,221
Mortgage Banking Revenue [Table Text Block]

Mortgage banking revenue was as follows (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Production revenue:
 
 
 
 
 
 
 
 
Net realized gains on sale of mortgage loans
 
$
8,971

 
$
9,063

 
$
24,838

 
$
28,699

Net change in unrealized gain on mortgage loans held for sale
 
97

 
(2,135
)
 
965

 
(2,457
)
Net change in the fair value of mortgage loan commitments
 
514

 
(2,446
)
 
4,733

 
(1,496
)
Net change in the fair value of forward sales contracts
 
4,232

 
2,768

 
3,015

 
1,871

Total production revenue
 
13,814

 
7,250

 
33,551

 
26,617

Servicing revenue
 
16,366

 
16,286

 
48,594

 
49,290

Total mortgage banking revenue
 
$
30,180

 
$
23,536

 
$
82,145

 
$
75,907
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
 
 
September 30, 2019
 
December 31, 2018
Number of residential mortgage loans serviced for others
 
128,463

 
132,463

Outstanding principal balance of residential mortgage loans serviced for others
 
$
21,046,136

 
$
21,658,335

Weighted average interest rate
 
3.99
%
 
3.99
%
Remaining term (in months)
 
290

 
293
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
The following represents activity in capitalized mortgage servicing rights (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Beginning Balance
 
$
208,308

 
$
278,719

 
$
259,254

 
$
252,867

Additions, net
 
9,882

 
8,968

 
24,821

 
28,688

Change in fair value due to principal payments
 
(11,936
)
 
(8,986
)
 
(27,600
)
 
(25,783
)
Change in fair value due to market assumption changes
 
(12,593
)
 
5,972

 
(62,814
)
 
28,901

Ending Balance
 
$
193,661

 
$
284,673

 
$
193,661

 
$
284,673
Assumptions to Value Mortgage Servicing Rights [Table Text Block]

Mortgage servicing rights are not traded in active markets. Fair value is determined by discounting the projected net cash flows. Significant market assumptions used to determine fair value based on significant unobservable inputs were as follows:
 
 
September 30, 2019
 
December 31, 2018
Discount rate – risk-free rate plus a market premium
 
9.82%
 
9.90%
Prepayment rate - based upon loan interest rate, original term and loan type
 
8.31% - 17.22%
 
8.05% - 15.74%
Loan servicing costs – annually per loan based upon loan type:
 
 
 
 
Performing loans
 
$68 - $94
 
$67 - $93
Delinquent loans
 
$150 - $500
 
$150 - $500
Loans in foreclosure
 
$1,000 - $4,000
 
$1,000 - $4,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
 
1.51%
 
2.57%
Primary/secondary mortgage rate spread
 
102 bps
 
105 bps
v3.19.3
Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2019
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
 
 
Unrealized Gain (Loss) on
 
 
 
 
Available for Sale Securities
 
Employee Benefit Plans
 
Total
Balance, December 31, 2017
 
$
(35,385
)
 
$
(789
)
 
$
(36,174
)
Transition adjustment for net unrealized gains on equity securities
 
(2,709
)
 
—

 
(2,709
)
Net change in unrealized gain (loss)
 
(166,464
)
 
—

 
(166,464
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
802

 
—

 
802

Other comprehensive loss, before income taxes
 
(165,662
)
 
—

 
(165,662
)
Federal and state income taxes1
 
(42,183
)
 
—

 
(42,183
)
Other comprehensive loss, net of income taxes
 
(123,479
)
 
—

 
(123,479
)
Balance, September 30, 2018
 
$
(161,573
)
 
$
(789
)
 
$
(162,362
)
 
 
 
 
 
 

Balance, December 31, 2018
 
$
(70,999
)
 
$
(1,586
)
 
$
(72,585
)
Net change in unrealized gain (loss)
 
274,441

 
—

 
274,441

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(1,110
)
 
—

 
(1,110
)
Other comprehensive income, before income taxes
 
273,331

 
—

 
273,331

Federal and state income taxes1
 
66,993

 
—

 
66,993

Other comprehensive income, net of income taxes
 
206,338

 
—

 
206,338

Balance, September 30, 2019
 
$
135,339


$
(1,586
)
 
$
133,753


1 
Calculated using a 25 percent blended federal and state statutory tax rate.
v3.19.3
Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share [Table Text Block]
(In thousands, except share and per share amounts)
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
 
Net income attributable to BOK Financial Corp. shareholders
 
$
142,231

 
$
117,256

 
$
390,406

 
$
337,190

Less: Earnings allocated to participating securities
 
875

 
963

 
2,553

 
2,940

Numerator for basic earnings per share – income available to common shareholders
 
141,356

 
116,293

 
387,853

 
334,250

Effect of reallocating undistributed earnings of participating securities
 
1

 
1

 
1

 
1

Numerator for diluted earnings per share – income available to common shareholders
 
$
141,357

 
$
116,294

 
$
387,854

 
$
334,251

 
 
 
 
 
 
 
 
 
Denominator:
 
 

 
 

 
 

 
 

Weighted average shares outstanding
 
71,033,405

 
65,438,849

 
71,425,855

 
65,455,306

Less:  Participating securities included in weighted average shares outstanding
 
437,098

 
537,754

 
472,311

 
571,987

Denominator for basic earnings per common share
 
70,596,307

 
64,901,095

 
70,953,544

 
64,883,319

Dilutive effect of employee stock compensation plans1
 
13,617

 
33,256

 
15,301

 
36,409

Denominator for diluted earnings per common share
 
70,609,924

 
64,934,351

 
70,968,845

 
64,919,728

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
2.00

 
$
1.79

 
$
5.47

 
$
5.15

Diluted earnings per share
 
$
2.00

 
$
1.79

 
$
5.47

 
$
5.15

1  Excludes employee stock options with exercise prices greater than current market price.
 
—

 
—

 
—

 
—
v3.19.3
Reportable Segments (Tables)
 9 Months Ended
Sep. 30, 2019
Segment Reporting [Abstract]  
Reportable Segments [Table Text Block]

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended September 30, 2019 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
243,944

 
$
27,580

 
$
12,343

 
$
(4,771
)
 
$
279,096

Net interest revenue (expense) from internal sources
 
(63,797
)
 
20,882

 
10,723

 
32,192

 
—

Net interest revenue
 
180,147

 
48,462

 
23,066

 
27,421

 
279,096

Provision for credit losses
 
9,505

 
1,841

 
(42
)
 
696

 
12,000

Net interest revenue after provision for credit losses
 
170,642

 
46,621

 
23,108

 
26,725

 
267,096

Other operating revenue
 
48,832

 
51,221

 
89,160

 
(2,763
)
 
186,450

Other operating expense
 
68,685

 
59,699

 
71,619

 
79,289

 
279,292

Net direct contribution
 
150,789

 
38,143

 
40,649

 
(55,327
)
 
174,254

Gain on financial instruments, net
 
28

 
8,339

 
—

 
(8,367
)
 
—

Change in fair value of mortgage servicing rights
 
—

 
(12,593
)
 
—

 
12,593

 
—

Gain on repossessed assets, net
 
802

 
214

 
—

 
(1,016
)
 
—

Corporate expense allocations
 
12,613

 
11,776

 
9,416

 
(33,805
)
 
—

Net income before taxes
 
139,006

 
22,327

 
31,233

 
(18,312
)
 
174,254

Federal and state income taxes
 
37,433

 
5,687

 
8,027

 
(18,751
)
 
32,396

Net income
 
101,573

 
16,640

 
23,206

 
439

 
141,858

Net income (loss) attributable to non-controlling interests
 
—

 
—

 
—

 
(373
)
 
(373
)
Net income attributable to BOK Financial Corp. shareholders
 
$
101,573

 
$
16,640

 
$
23,206

 
$
812

 
$
142,231

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
23,973,067

 
$
9,827,130

 
$
10,392,988

 
$
(611,075
)
 
$
43,582,110





Reportable segments reconciliation to the Consolidated Financial Statements for the nine months ended September 30, 2019 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other1
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
699,239

 
$
75,353

 
$
51,054

 
$
16,984

 
$
842,630

Net interest revenue (expense) from internal sources
 
(181,829
)
 
76,925

 
27,213

 
77,691

 
—

Net interest revenue
 
517,410

 
152,278

 
78,267

 
94,675

 
842,630

Provision for credit losses
 
27,574

 
4,654

 
(209
)
 
(7,019
)
 
25,000

Net interest revenue after provision for credit losses
 
489,836

 
147,624

 
78,476

 
101,694

 
817,630

Other operating revenue
 
128,055

 
142,780

 
248,591

 
(3,641
)
 
515,785

Other operating expense
 
181,809

 
171,214

 
202,579

 
287,984

 
843,586

Net direct contribution
 
436,082

 
119,190

 
124,488

 
(189,931
)
 
489,829

Gain on financial instruments, net
 
67

 
43,416

 
—

 
(43,483
)
 
—

Change in fair value of mortgage servicing rights
 
—

 
(62,814
)
 
—

 
62,814

 
—

Gain on repossessed assets, net
 
455

 
409

 
—

 
(864
)
 
—

Corporate expense allocations
 
34,146

 
35,369

 
26,943

 
(96,458
)
 
—

Net income before taxes
 
402,458

 
64,832

 
97,545

 
(75,006
)
 
489,829

Federal and state income taxes
 
107,807

 
16,513

 
25,076

 
(49,470
)
 
99,926

Net income
 
294,651

 
48,319

 
72,469

 
(25,536
)
 
389,903

Net income (loss) attributable to non-controlling interests
 
—

 
—

 
—

 
(503
)
 
(503
)
Net income attributable to BOK Financial Corp. shareholders
 
$
294,651

 
$
48,319

 
$
72,469

 
$
(25,033
)
 
$
390,406

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
22,288,129

 
$
9,142,491

 
$
9,861,021

 
$
89,202

 
$
41,380,843

1 
CoBiz operations are included in Funds Management and Other for the first quarter of 2019 and subsequently allocated to the respective segments in the second quarter of 2019.

Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended September 30, 2018 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
187,417

 
$
20,005

 
$
22,509

 
$
10,952

 
$
240,883

Net interest revenue (expense) from internal sources
 
(42,270
)
 
19,039

 
6,267

 
16,964

 
—

Net interest revenue
 
145,147

 
39,044

 
28,776

 
27,916

 
240,883

Provision for credit losses
 
8,047

 
1,451

 
(84
)
 
(5,414
)
 
4,000

Net interest revenue after provision for credit losses
 
137,100

 
37,593

 
28,860

 
33,330

 
236,883

Other operating revenue
 
40,522

 
44,024

 
83,357

 
38

 
167,941

Other operating expense
 
51,039

 
58,482

 
62,256

 
80,840

 
252,617

Net direct contribution
 
126,583

 
23,135

 
49,961

 
(47,472
)
 
152,207

Gain (loss) on financial instruments, net
 
(3
)
 
(7,229
)
 
7

 
7,225

 
—

Change in fair value of mortgage servicing rights
 
—

 
5,972

 
—

 
(5,972
)
 
—

Gain (loss) on repossessed assets, net
 
(1,869
)
 
(87
)
 
—

 
1,956

 
—

Corporate expense allocations
 
9,124

 
11,037

 
11,127

 
(31,288
)
 
—

Net income before taxes
 
115,587

 
10,754

 
38,841

 
(12,975
)
 
152,207

Federal and state income taxes
 
30,623

 
2,739

 
9,975

 
(8,675
)
 
34,662

Net income
 
84,964

 
8,015

 
28,866

 
(4,300
)
 
117,545

Net income attributable to non-controlling interests
 
—

 
—

 
—

 
289

 
289

Net income (loss) attributable to BOK Financial Corp. shareholders
 
$
84,964

 
$
8,015

 
$
28,866

 
$
(4,589
)
 
$
117,256

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
18,499,979

 
$
8,323,543

 
$
8,498,363

 
$
(1,626,068
)
 
$
33,695,817



Reportable segments reconciliation to the Consolidated Financial Statements for the nine months ended September 30, 2018 is as follows (in thousands):
 
 
Commercial
 
Consumer
 
Wealth
Management
 
Funds Management and Other
 
BOK
Financial
Consolidated
Net interest revenue from external sources
 
$
529,958

 
$
63,504

 
$
56,990

 
$
48,729

 
$
699,181

Net interest revenue (expense) from internal sources
 
(107,715
)
 
51,811

 
26,431

 
29,473

 
—

Net interest revenue
 
422,243

 
115,315

 
83,421

 
78,202

 
699,181

Provision for credit losses
 
18,781

 
3,890

 
(238
)
 
(23,433
)
 
(1,000
)
Net interest revenue after provision for credit losses
 
403,462

 
111,425

 
83,659

 
101,635

 
700,181

Other operating revenue
 
123,245

 
135,291

 
228,766

 
(6,973
)
 
480,329

Other operating expense
 
148,796

 
174,728

 
188,691

 
231,308

 
743,523

Net direct contribution
 
377,911

 
71,988

 
123,734

 
(136,646
)
 
436,987

Gain (loss) on financial instruments, net
 
13

 
(36,901
)
 
7

 
36,881

 
—

Change in fair value of mortgage servicing rights
 
—

 
28,901

 
—

 
(28,901
)
 
—

Gain (loss) on repossessed assets, net
 
(6,102
)
 
(21
)
 
—

 
6,123

 
—

Corporate expense allocations
 
29,092

 
33,283

 
31,084

 
(93,459
)
 
—

Net income before taxes
 
342,730

 
30,684

 
92,657

 
(29,084
)
 
436,987

Federal and state income taxes
 
90,943

 
7,816

 
23,824

 
(23,643
)
 
98,940

Net income
 
251,787

 
22,868

 
68,833

 
(5,441
)
 
338,047

Net income attributable to non-controlling interests
 
—

 
—

 
—

 
857

 
857

Net income attributable to BOK Financial Corp. shareholders
 
$
251,787

 
$
22,868

 
$
68,833

 
$
(6,298
)
 
$
337,190

 
 
 
 
 
 
 
 
 
 
 
Average assets
 
$
18,124,571

 
$
8,381,205

 
$
8,364,712

 
$
(1,094,993
)
 
$
33,775,495
v3.19.3
Fees and Commissions Revenue Fees and Commissions Rvenue (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Fees and Commissions Revenue [Table Text Block]
Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended September 30, 2019.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other3
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
24,091

 
$
—

 
$
24,091

 
$
24,091

 
$
—

Customer hedging revenue
2,283

 
—

 
1,810

 
591

 
4,684

 
4,684

 
—

Retail brokerage revenue
—

 
—

 
4,204

 
—

 
4,204

 
—

 
4,204

Insurance brokerage revenue
—

 
—

 
3,375

 
(513
)
 
2,862

 
—

 
2,862

Investment banking revenue
4,408

 
—

 
3,590

 
1

 
7,999

 
3,762

 
4,237

Brokerage and trading revenue
6,691

 
—

 
37,070

 
79

 
43,840

 
32,537

 
11,303

TransFund EFT network revenue
18,465

 
1,020

 
(23
)
 
2

 
19,464

 
—

 
19,464

Merchant services revenue
2,203

 
14

 
—

 
—

 
2,217

 
—

 
2,217

Corporate card revenue
328

 
—

 
6

 
—

 
334

 
—

 
334

Transaction card revenue
20,996

 
1,034

 
(17
)
 
2

 
22,015

 
—

 
22,015

Personal trust revenue
—

 
—

 
20,239

 
(1
)
 
20,238

 
—

 
20,238

Corporate trust revenue
—

 
—

 
6,204

 
1

 
6,205

 
—

 
6,205

Institutional trust & retirement plan services revenue
—

 
—

 
10,740

 
—

 
10,740

 
—

 
10,740

Investment management services and other revenue
—

 
—

 
6,480

 
(42
)
 
6,438

 
—

 
6,438

Fiduciary and asset management revenue
—

 
—

 
43,663

 
(42
)
 
43,621

 
—

 
43,621

Commercial account service charge revenue
10,609

 
467

 
540

 
(3
)
 
11,613

 
—

 
11,613

Overdraft fee revenue
81

 
9,603

 
45

 
3

 
9,732

 
—

 
9,732

Check card revenue
—

 
5,721

 
—

 
—

 
5,721

 
—

 
5,721

Automated service charge and other deposit fee revenue
197

 
1,519

 
53

 
2

 
1,771

 
—

 
1,771

Deposit service charges and fees
10,887

 
17,310

 
638

 
2

 
28,837

 
—

 
28,837

Mortgage production revenue
—

 
13,815

 
—

 
(1
)
 
13,814

 
13,814

 
—

Mortgage servicing revenue
—

 
16,828

 
—

 
(462
)
 
16,366

 
16,366

 
—

Mortgage banking revenue
—

 
30,643

 
—

 
(463
)
 
30,180

 
30,180

 
—

Other revenue
7,585

 
2,474

 
8,068

 
(501
)
 
17,626

 
11,812

 
5,814

Total fees and commissions revenue
$
46,159

 
$
51,461

 
$
89,422

 
$
(923
)
 
$
186,119

 
$
74,529

 
$
111,590

1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
3  
CoBiz operations are included in Funds Management and Other for the first quarter of 2019.

Fees and commissions revenue by reportable segment and primary service line is as follows for the nine months ended September 30, 2019.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other3
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
58,890

 
$
—

 
$
58,890

 
$
58,890

 
$
—

Customer hedging revenue
6,243

 
—

 
9,444

 
1,019

 
16,706

 
16,706

 
—

Retail brokerage revenue
—

 
—

 
12,192

 
(65
)
 
12,127

 
—

 
12,127

Insurance brokerage revenue
—

 
—

 
7,063

 
3,729

 
10,792

 
—

 
10,792

Investment banking revenue
8,345

 
—

 
9,123

 
—

 
17,468

 
7,189

 
10,279

Brokerage and trading revenue
14,588

 
—

 
96,712

 
4,683

 
115,983

 
82,785

 
33,198

TransFund EFT network revenue
54,623

 
2,975

 
(60
)
 
3

 
57,541

 
—

 
57,541

Merchant services revenue
6,351

 
43

 
—

 
122

 
6,516

 
—

 
6,516

Corporate card revenue
598

 
—

 
11

 
2

 
611

 
—

 
611

Transaction card revenue
61,572

 
3,018

 
(49
)
 
127

 
64,668

 
—

 
64,668

Personal trust revenue
—

 
—

 
61,028

 
—

 
61,028

 
—

 
61,028

Corporate trust revenue
—

 
—

 
18,736

 
—

 
18,736

 
—

 
18,736

Institutional trust & retirement plan services revenue
—

 
—

 
32,919

 
—

 
32,919

 
—

 
32,919

Investment management services and other revenue
—

 
—

 
17,730

 
1,591

 
19,321

 
—

 
19,321

Fiduciary and asset management revenue
—

 
—

 
130,413

 
1,591

 
132,004

 
—

 
132,004

Commercial account service charge revenue
31,296

 
1,283

 
1,605

 
1,804

 
35,988

 
—

 
35,988

Overdraft fee revenue
248

 
26,971

 
108

 
(231
)
 
27,096

 
—

 
27,096

Check card revenue
—

 
16,299

 
—

 
165

 
16,464

 
—

 
16,464

Automated service charge and other deposit fee revenue
569

 
4,762

 
228

 
47

 
5,606

 
—

 
5,606

Deposit service charges and fees
32,113

 
49,315

 
1,941

 
1,785

 
85,154

 
—

 
85,154

Mortgage production revenue
—

 
33,554

 
—

 
(3
)
 
33,551

 
33,551

 
—

Mortgage servicing revenue
—

 
50,014

 
—

 
(1,420
)
 
48,594

 
48,594

 
—

Mortgage banking revenue
—

 
83,568

 
—

 
(1,423
)
 
82,145

 
82,145

 
—

Other revenue
17,037

 
7,211

 
19,586

 
(1,009
)
 
42,825

 
28,655

 
14,170

Total fees and commissions revenue
$
125,310

 
$
143,112

 
$
248,603

 
$
5,754

 
$
522,779

 
$
193,585

 
$
329,194

1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
3  
CoBiz operations are included in Funds Management and Other for the first quarter of 2019.

Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended September 30, 2018.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
4,830

 
$
—

 
$
4,830

 
$
4,830

 
$
—

Customer hedging revenue
1,350

 
—

 
6,935

 
229

 
8,514

 
8,514

 
—

Retail brokerage revenue
—

 
—

 
4,398

 
(73
)
 
4,325

 
—

 
4,325

Insurance brokerage revenue
—

 
—

 
170

 
—

 
170

 
—

 
170

Investment banking revenue
1,765

 
—

 
3,482

 
—

 
5,247

 
1,410

 
3,837

Brokerage and trading revenue
3,115

 
—

 
19,815

 
156

 
23,086

 
14,754

 
8,332

TransFund EFT network revenue
18,397

 
1,009

 
(21
)
 
2

 
19,387

 
—

 
19,387

Merchant services revenue
1,995

 
14

 
—

 
—

 
2,009

 
—

 
2,009

Corporate card revenue
—

 
—

 
—

 
—

 
—

 
—

 
—

Transaction card revenue
20,392

 
1,023

 
(21
)
 
2

 
21,396

 
—

 
21,396

Personal trust revenue
—

 
—

 
35,822

 
1

 
35,823

 
—

 
35,823

Corporate trust revenue
—

 
—

 
5,741

 
—

 
5,741

 
—

 
5,741

Institutional trust & retirement plan services revenue
—

 
—

 
11,095

 
(1
)
 
11,094

 
—

 
11,094

Investment management services and other revenue
—

 
—

 
4,903

 
(47
)
 
4,856

 
—

 
4,856

Fiduciary and asset management revenue
—

 
—

 
57,561

 
(47
)
 
57,514

 
—

 
57,514

Commercial account service charge revenue
10,294

 
366

 
587

 
(3
)
 
11,244

 
—

 
11,244

Overdraft fee revenue
95

 
9,413

 
30

 
3

 
9,541

 
—

 
9,541

Check card revenue
—

 
5,254

 
—

 
—

 
5,254

 
—

 
5,254

Automated service charge and other deposit fee revenue
35

 
1,661

 
22

 
8

 
1,726

 
—

 
1,726

Deposit service charges and fees
10,424

 
16,694

 
639

 
8

 
27,765

 
—

 
27,765

Mortgage production revenue
—

 
7,250

 
—

 
—

 
7,250

 
7,250

 
—

Mortgage servicing revenue
—

 
16,748

 
—

 
(462
)
 
16,286

 
16,286

 
—

Mortgage banking revenue
—

 
23,998

 
—

 
(462
)
 
23,536

 
23,536

 
—

Other revenue
5,460

 
2,323

 
5,568

 
(451
)
 
12,900

 
8,799

 
4,101

Total fees and commissions revenue
$
39,391

 
$
44,038

 
$
83,562

 
$
(794
)
 
$
166,197

 
$
47,089

 
$
119,108


1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.

Fees and commissions revenue by reportable segment and primary service line is as follows for the nine months ended September 30, 2018.
 
Commercial
 
Consumer
 
Wealth Management
 
Funds Management & Other
 
Consolidated
 
Out of Scope1
 
In Scope2
Trading revenue
$
—

 
$
—

 
$
21,562

 
$
—

 
$
21,562

 
$
21,562

 
$
—

Customer hedging revenue
6,264

 
—

 
21,511

 
1,441

 
29,216

 
29,216

 
—

Retail brokerage revenue
—

 
—

 
13,751

 
(246
)
 
13,505

 
—

 
13,505

Insurance brokerage revenue
—

 
—

 
555

 
—

 
555

 
—

 
555

Investment banking revenue
5,729

 
—

 
9,655

 
—

 
15,384

 
4,772

 
10,612

Brokerage and trading revenue
11,993

 
—

 
67,034

 
1,195

 
80,222

 
55,550

 
24,672

TransFund EFT network revenue
54,647

 
3,005

 
(61
)
 
5

 
57,596

 
—

 
57,596

Merchant services revenue
5,720

 
45

 
—

 
—

 
5,765

 
—

 
5,765

Corporate card revenue
—

 
—

 
—

 
—

 
—

 
—

 
—

Transaction card revenue
60,367

 
3,050

 
(61
)
 
5

 
63,361

 
—

 
63,361

Personal trust revenue
—

 
—

 
76,481

 
(2
)
 
76,479

 
—

 
76,479

Corporate trust revenue
—

 
—

 
16,317

 
—

 
16,317

 
—

 
16,317

Institutional trust & retirement plan services revenue
—

 
—

 
33,584

 
3

 
33,587

 
—

 
33,587

Investment management services and other revenue
—

 
—

 
14,808

 
(153
)
 
14,655

 
—

 
14,655

Fiduciary and asset management revenue
—

 
—

 
141,190

 
(152
)
 
141,038

 
—

 
141,038

Commercial account service charge revenue
32,150

 
1,087

 
1,802

 
(3
)
 
35,036

 
—

 
35,036

Overdraft fee revenue
283

 
26,665

 
96

 
13

 
27,057

 
—

 
27,057

Check card revenue
—

 
15,515

 
—

 
—

 
15,515

 
—

 
15,515

Automated service charge and other deposit fee revenue
110

 
4,953

 
72

 
17

 
5,152

 
—

 
5,152

Deposit service charges and fees
32,543

 
48,220

 
1,970

 
27

 
82,760

 
—

 
82,760

Mortgage production revenue
—

 
26,617

 
—

 
—

 
26,617

 
26,617

 
—

Mortgage servicing revenue
—

 
50,677

 
—

 
(1,387
)
 
49,290

 
49,290

 
—

Mortgage banking revenue
—

 
77,294

 
—

 
(1,387
)
 
75,907

 
75,907

 
—

Other revenue
17,379

 
6,770

 
18,725

 
(3,093
)
 
39,781

 
27,552

 
12,229

Total fees and commissions revenue
$
122,282

 
$
135,334

 
$
228,858

 
$
(3,405
)
 
$
483,069

 
$
159,009

 
$
324,060

1  
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2 
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
v3.19.3
Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Assets And Liabilities Measured On A Recurring Basis [Table Text Block]
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of September 30, 2019 (in thousands):
 
 
Total
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
$
63,334

 
$
—

 
$
63,334

 
$
—

Residential agency mortgage-backed securities
 
1,480,458

 
—

 
1,480,458

 
—

Municipal and other tax-exempt securities
 
44,105

 
—

 
44,105

 
—

Asset-backed securities
 
36,928

 
—

 
36,928

 
—

Other trading securities
 
50,387

 
—

 
50,387

 
—

Total trading securities
 
1,675,212

 
—

 
1,675,212

 
—

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
2,296

 
2,296

 
—

 
—

Municipal and other tax-exempt securities
 
1,848

 
—

 
1,848

 
—

Residential agency mortgage-backed securities
 
7,740,461

 
—

 
7,740,461

 
—

Residential non-agency mortgage-backed securities
 
44,803

 
—

 
44,803

 
—

Commercial agency mortgage-backed securities
 
3,234,671

 
—

 
3,234,671

 
—

Other debt securities
 
472

 
—

 
—

 
472

Total available for sale securities
 
11,024,551

 
2,296

 
11,021,783

 
472

Fair value option securities:
 
 
 
 
 
 
 
 
U.S. Treasury
 
552,536

 
552,536

 
—

 
—

Residential agency mortgage-backed securities
 
1,263,862

 
—

 
1,263,862

 
—

Total fair value option securities
 
1,816,398

 
552,536

 
1,263,862

 
—

Residential mortgage loans held for sale
 
282,487

 
—

 
268,919

 
13,568

Mortgage servicing rights1
 
193,661

 
—

 
—

 
193,661

Derivative contracts, net of cash collateral2
 
352,019

 
40,491

 
311,528

 
—

Liabilities:
 
 

 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
336,791

 
—

 
336,791

 
—

1 
A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
2 
See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded energy, interest rate and agricultural derivative contacts, net of cash margin. Derivative contacts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate derivative contracts, fully offset by cash margin.

The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2018 (in thousands):
 
 
Total
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
$
63,765

 
$
—

 
$
63,765

 
$
—

Residential agency mortgage-backed securities
 
1,791,584

 
—

 
1,791,584

 
—

Municipal and other tax-exempt securities
 
34,507

 
—

 
34,507

 
—

Asset-backed securities
 
42,656

 
—

 
42,656

 
—

Other trading securities
 
24,411

 
—

 
24,411

 
—

Total trading securities
 
1,956,923

 
—

 
1,956,923

 
—

Available for sale securities:
 
 

 
 

 
 

 
 

U.S. Treasury
 
493

 
493

 
—

 
—

Municipal and other tax-exempt securities
 
2,864

 
—

 
2,864

 
—

Residential agency mortgage-backed securities
 
5,804,708

 
—

 
5,804,708

 
—

Residential non-agency mortgage-backed securities
 
59,736

 
—

 
59,736

 
—

Commercial agency mortgage-backed securities
 
2,953,889

 
—

 
2,953,889

 
—

Other debt securities
 
35,430

 
—

 
34,958

 
472

Total available for sale securities
 
8,857,120

 
493

 
8,856,155

 
472

Fair value option securities – Residential agency mortgage-backed securities
 
283,235

 
—

 
283,235

 
—

Residential mortgage loans held for sale
 
149,221

 
—

 
134,014

 
15,207

Mortgage servicing rights1
 
259,254

 
—

 
—

 
259,254

Derivative contracts, net of cash collateral2
 
320,929

 
44,074

 
276,855

 
—

Liabilities:
 


 
 
 
 
 
 
Derivative contracts, net of cash collateral2
 
362,306

 
—

 
362,306

 
—

1 
A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
2 
See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural derivative contacts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate contracts, fully offset by cash margin.
Fair Value Assets Measured On Recurring Basis, Significant Unobservable Inputs [Table Text Block]
The following represents the changes for the three and nine months ended September 30, 2019 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):

 
 
Available for sale - Other debt securities
 
Residential mortgage loans held for sale
Balance, June 30, 2019
 
$
472

 
$
16,073

Transfer to Level 3 from Level 21
 
—

 
261

Purchases
 
—

 
—

Proceeds from sales
 
—

 
(3,152
)
Redemptions and distributions
 
—

 
—

Gain (loss) recognized in earnings:
 
 
 
 
Mortgage banking revenue
 
—

 
386

Other comprehensive income (loss):
 
 
 
 
Net change in unrealized gain (loss)
 
—

 
—

Balance, September 30, 2019
 
$
472

 
$
13,568

1  
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

 
 
Available for sale - Other debt securities
 
Residential mortgage loans held for sale
Balance, December 31, 2018
 
$
472

 
$
15,207

Transfer to Level 3 from Level 21
 
—

 
2,150

Purchases
 
—

 
—

Proceeds from sales
 
—

 
(4,531
)
Redemptions and distributions
 
—

 
—

Gain (loss) recognized in earnings:
 
 
 
 
Mortgage banking revenue
 
—

 
742

Other comprehensive income (loss):
 
 
 
 
Net change in unrealized gain (loss)
 
—

 
—

Balance, September 30, 2019
 
$
472

 
$
13,568


1  
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

The following represents the changes for the three and nine months ended September 30, 2018 related to assets measured at fair value on a recurring basis using significant unobservable inputs (in thousands):
 
 
Available for Sale Securities
 
 
 
 
Municipal and other tax-exempt securities
 
Other debt securities
 
Residential mortgage loans held for sale
Balance, June 30, 2018
 
$
2,030

 
$
471

 
$
14,243

Transfer to Level 3 from Level 21
 
—

 
—

 
2,862

Purchases
 
—

 
—

 
—

Proceeds from sales
 
—

 
—

 
(143
)
Redemptions and distributions
 
(2,050
)
 
—

 
—

Gain (loss) recognized in earnings:
 
 
 
 
 
 
Mortgage banking revenue
 
—

 
—

 
(124
)
Other comprehensive income (loss):
 
 
 
 
 
 
Net change in unrealized gain (loss)
 
20

 
1

 
—

Balance, September 30, 2018
 
$
—

 
$
472

 
$
16,838

1 
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.

 
 
Available for Sale Securities
 
 
 
 
Municipal and other tax-exempt
 
Other debt securities
 
Residential mortgage loans held for sale
Balance, December 31, 2017
 
$
4,802

 
$
472

 
$
12,299

Transfer to Level 3 from Level 21
 
—

 
—

 
5,603

Purchases
 
—

 
—

 
—

Proceeds from sales
 
—

 
—

 
(853
)
Redemptions and distributions
 
(5,095
)
 
—

 
—

Gain (loss) recognized in earnings
 
 
 
 
 
 
Mortgage banking revenue
 
—

 
—

 
(211
)
Other comprehensive income (loss):
 
 
 
 
 
 
Net change in unrealized gain (loss)
 
293

 
—

 
—

Balance, September 30, 2018
 
$
—

 
$
472

 
$
16,838


1 
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.
Fair Value Inputs, Fair Value Measured On a Recurring Basis, Quantitative Information [Table Text Block]
A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of September 30, 2019 follows (in thousands):
 
 
Fair
Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
 
 
 
 
 
 
 
 
 
 
 
Available for sale securities – Other debt securities
 
472

 
Discounted cash flows
1 
Interest rate spread
 
7.46%-7.46% (7.46%)
3 
94.42%-94.42% (94.42%)
2 
Residential mortgage loans held for sale
 
13,568

 
Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
 
Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies.
 
96.36%
 
1 
Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume.
2 
Represents fair value as a percentage of par value.
3 
Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding approximately 3 percent.

A summary of quantitative information about assets measured at fair value on a recurring basis using Significant Unobservable Inputs (Level 3) as of December 31, 2018 follows (in thousands):
 
 
Fair
Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
 
 
 
 
 
 
 
 
 
 
 
Available for sale securities – Other debt securities
 
472

 
Discounted cash flows
1 
Interest rate spread
 
7.88%-7.88% (7.88%)
3 
94.44%-94.44% (94.44%)
2 
Residential mortgage loans held for sale
 
15,207

 
Quoted prices of loans sold in securitization transactions, with a liquidity discount applied
 
Liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies.
 
92.38%
 
1 
Discounted cash flows developed using discount rates primarily based on reference to interest rate spreads for comparable securities of similar duration and credit rating as determined by the nationally-recognized rating agencies, adjusted for lack of trading volume
2 
Represents fair value as a percentage of par value.
3 
Interest rate yields used to value investment grade taxable securities based on comparable short-term taxable securities which are generally yielding less than 3 percent.
Fair Value Assets Measured on Nonrecurring Basis [Table Text Block]
The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at September 30, 2019 for which the fair value was adjusted during the nine months ended September 30, 2019:
 
 
 
 
 
 
 
Fair Value Adjustments for the
 
Carrying Value at September 30, 2019
 
Three Months Ended
Sept. 30, 2019
Recognized in:
 
Nine Months Ended
Sept. 30, 2019
Recognized in:
 
Quoted Prices
in Active Markets for Identical Instruments
 
Significant
Other
Observable
Inputs
 
Significant
Unobservable
Inputs
 
Gross charge-offs against allowance for loan losses
 
Net losses (gains) and operating expenses of repossessed assets
 
Gross charge-offs against allowance for loan losses
 
Net losses (gains) and operating expenses of repossessed assets
Impaired loans
$
—

 
$
79

 
$
9,810

 
$
2,644

 
$
—

 
$
13,868

 
$
—

Real estate and other repossessed assets
—

 
5,044

 
936

 
—

 
(979
)
 
—

 
(532
)
 
The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at September 30, 2018 for which the fair value was adjusted during the nine months ended September 30, 2018:
 
 
 
 
 
 
 
Fair Value Adjustments for the
 
Carrying Value at September 30, 2018
 
Three Months Ended
Sept. 30, 2018
Recognized in:
 
Nine Months Ended
Sept. 30, 2018
Recognized in:
 
Quoted Prices
in Active Markets for Identical Instruments
 
Significant
Other
Observable
Inputs
 
Significant
Unobservable
Inputs
 
Gross charge-offs against allowance for loan losses
 
Net losses and operating expenses of repossessed assets
 
Gross charge-offs against allowance for loan losses
 
Net losses and operating expenses of repossessed assets
Impaired loans
$
—

 
$
1,065

 
$
24,428

 
$
9,086

 
$
—

 
$
16,279

 
$
—

Real estate and other repossessed assets
—

 
4,608

 
6,545

 
—

 
2,161

 
—

 
7,388
Fair Value Inputs, Fair Value Measured On a Nonrecurring Basis, Quantitative Information [Table Text Block]
A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of September 30, 2019 follows (in thousands):
 
 
Fair Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
Impaired loans
 
$
9,810

 
Discounted cash flows
 
Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
8% - 76% (28%)1
Real estate and other repossessed assets
 
936

 
Appraised value, as adjusted
 
Marketability adjustments off appraised value2
 
75% - 89% (85%)
1 
Represents fair value as a percentage of the unpaid principal balance.
2 
Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of September 30, 2018 follows (in thousands):
 
 
Fair Value
 
Valuation Technique(s)
 
Unobservable Input
 
Range
(Weighted Average)
Impaired loans
 
$
24,428

 
Discounted cash flows
 
Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
41% - 84% (55%)1
Real estate and other repossessed assets
 
6,545

 
Discounted cash flows
 
Recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs
 
N/A

1  
Represents fair value as a percentage of the unpaid principal balance.
Fair Value of Financial Instruments [Table Text Block]
The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of September 30, 2019 (dollars in thousands):
 
 
Carrying
Value
 
Estimated
Fair
Value
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Cash and due from banks
 
$
761,130

 
$
761,130

 
$
761,130

 
$
—

 
$
—

Interest-bearing cash and cash equivalents
 
465,458

 
465,458

 
465,458

 
—

 
—

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
63,334

 
63,334

 
—

 
63,334

 
—

Residential agency mortgage-backed securities
 
1,480,458

 
1,480,458

 
—

 
1,480,458

 
—

Municipal and other tax-exempt securities
 
44,105

 
44,105

 
—

 
44,105

 
—

Asset-backed securities
 
36,928

 
36,928

 
—

 
36,928

 
—

Other trading securities
 
50,387

 
50,387

 
—

 
50,387

 
—

Total trading securities
 
1,675,212

 
1,675,212

 
—

 
1,675,212

 
—

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
104,418

 
107,647

 
—

 
107,647

 
—

Residential agency mortgage-backed securities
 
11,125

 
11,650

 
—

 
11,650

 
—

Other debt securities
 
188,681

 
204,724

 
—

 
7,702

 
197,022

Total investment securities
 
304,224

 
324,021

 
—

 
126,999

 
197,022

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
2,296

 
2,296

 
2,296

 
—

 
—

Municipal and other tax-exempt securities
 
1,848

 
1,848

 
—

 
1,848

 
—

Residential agency mortgage-backed securities
 
7,740,461

 
7,740,461

 
—

 
7,740,461

 
—

Residential non-agency mortgage-backed securities
 
44,803

 
44,803

 
—

 
44,803

 
—

Commercial agency mortgage-backed securities
 
3,234,671

 
3,234,671

 
—

 
3,234,671

 
—

Other debt securities
 
472

 
472

 
—

 
—

 
472

Total available for sale securities
 
11,024,551

 
11,024,551

 
2,296

 
11,021,783

 
472

Fair value option securities:
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
 
552,536

 
552,536

 
552,536

 
—

 
—

Residential agency mortgage-backed securities
 
1,263,862

 
1,263,862

 
—

 
1,263,862

 
—

Total fair value option securities
 
1,816,398

 
1,816,398

 
552,536

 
1,263,862

 
—

Residential mortgage loans held for sale
 
282,487

 
282,487

 
—

 
268,919

 
13,568

Loans:
 
 

 
 

 
 
 
—

 
 
Commercial
 
14,424,625

 
14,397,846

 
—

 
—

 
14,397,846

Commercial real estate
 
4,626,057

 
4,626,804

 
—

 
—

 
4,626,804

Residential mortgage
 
2,117,303

 
2,132,158

 
—

 
—

 
2,132,158

Personal
 
1,117,382

 
1,108,984

 
—

 
—

 
1,108,984

Total loans
 
22,285,367

 
22,265,792

 
—

 
—

 
22,265,792

Allowance for loan losses
 
(204,432
)
 
—

 
—

 
—

 
—

Loans, net of allowance
 
22,080,935

 
22,265,792

 
—

 
—

 
22,265,792

Mortgage servicing rights
 
193,661

 
193,661

 
—

 
—

 
193,661

Derivative instruments with positive fair value, net of cash collateral
 
352,019

 
352,019

 
40,491

 
311,528

 
—

Deposits with no stated maturity
 
23,923,535

 
23,923,535

 
—

 
—

 
23,923,535

Time deposits
 
2,243,541

 
2,241,778

 
—

 
—

 
2,241,778

Other borrowed funds
 
10,235,385

 
10,193,602

 
—

 
—

 
10,193,602

Subordinated debentures
 
275,909

 
276,393

 
—

 
276,393

 
—

Derivative instruments with negative fair value, net of cash collateral
 
336,791

 
336,791

 
—

 
336,791

 
—


The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis as of December 31, 2018 (dollars in thousands):
 
 
Carrying
Value
 
Estimated
Fair
Value
 
Quoted Prices in Active Markets for Identical Instruments (Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Cash and due from banks
 
$
741,749

 
$
741,749

 
$
741,749

 
$
—

 
$
—

Interest-bearing cash and cash equivalents
 
401,675

 
401,675

 
401,675

 
—

 
—

Trading securities:
 
 
 
 
 
 
 
 
 
 
U.S. government agency debentures
 
63,765

 
63,765

 
—

 
63,765

 
—

Residential agency mortgage-backed securities
 
1,791,584

 
1,791,584

 
—

 
1,791,584

 
—

Municipal and other tax-exempt securities
 
34,507

 
34,507

 
—

 
34,507

 
—

Asset-backed securities
 
42,656

 
42,656

 
—

 
42,656

 
—

Other trading securities
 
24,411

 
24,411

 
—

 
24,411

 
—

Total trading securities
 
1,956,923

 
1,956,923

 
—

 
1,956,923

 
—

Investment securities:
 
 

 
 

 
 
 
 
 
 
Municipal and other tax-exempt securities
 
137,296

 
138,562

 
—

 
138,562

 
—

Residential agency mortgage-backed securities
 
12,612

 
12,770

 
—

 
12,770

 
—

Other debt securities
 
205,279

 
215,966

 
—

 
7,905

 
208,061

Total investment securities
 
355,187

 
367,298

 
—

 
159,237

 
208,061

Available for sale securities:
 
 

 
 

 
 
 
 
 
 
U.S. Treasury
 
493

 
493

 
493

 
—

 
—

Municipal and other tax-exempt securities
 
2,864

 
2,864

 
—

 
2,864

 
—

Residential agency mortgage-backed securities
 
5,804,708

 
5,804,708

 
—

 
5,804,708

 
—

Residential non-agency mortgage-backed securities
 
59,736

 
59,736

 
—

 
59,736

 
—

Commercial agency mortgage-backed securities
 
2,953,889

 
2,953,889

 
—

 
2,953,889

 
—

Other debt securities
 
35,430

 
35,430

 
—

 
34,958

 
472

Total available for sale securities
 
8,857,120

 
8,857,120

 
493

 
8,856,155

 
472

Fair value option securities – Residential agency mortgage-backed securities
 
283,235

 
283,235

 
—

 
283,235

 
—

Residential mortgage loans held for sale
 
149,221

 
149,221

 
—

 
134,014

 
15,207

Loans:
 
 

 
 

 
 
 
 
 
 
Commercial
 
13,636,078

 
13,526,162

 
—

 
—

 
13,526,162

Commercial real estate
 
4,764,813

 
4,713,747

 
—

 
—

 
4,713,747

Residential mortgage
 
2,230,033

 
2,213,951

 
—

 
—

 
2,213,951

Personal
 
1,025,806

 
1,024,368

 
—

 
—

 
1,024,368

Total loans
 
21,656,730

 
21,478,228

 
—

 
—

 
21,478,228

Allowance for loan losses
 
(207,457
)
 
—

 
—

 
—

 
—

Loans, net of allowance
 
21,449,273

 
21,478,228

 
—

 
—

 
21,478,228

Mortgage servicing rights
 
259,254

 
259,254

 
—

 
—

 
259,254

Derivative instruments with positive fair value, net of cash collateral
 
320,929

 
320,929

 
44,074

 
276,855

 
—

Deposits with no stated maturity
 
23,150,383

 
23,150,383

 
—

 
—

 
23,150,383

Time deposits
 
2,113,380

 
2,073,538

 
—

 
—

 
2,073,538

Other borrowed funds
 
7,142,801

 
7,071,953

 
—

 
—

 
7,071,953

Subordinated debentures
 
275,913

 
261,977

 
—

 
261,977

 
—

Derivative instruments with negative fair value, net of cash collateral
 
362,306

 
362,306

 
—

 
362,306

 
—
v3.19.3
Significant Accounting Policies Loans and Allowance for Credit Losses (Details)
 9 Months Ended
Sep. 30, 2019
Loans and Allowance for Credit Losses [Abstract]  
Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status 90 days
Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status 60 days
Loans and Allowances for Credit Losses, Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off 60 days
Loans and Allowances for Credit Losses, Maximum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off 180 days
Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off 60 days
v3.19.3
Significant Accounting Policies Newly Adopted and Pending Accounting Pronouncements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Operating Lease, Right-of-Use Asset $ 180 $ 137
v3.19.3
Trading Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Trading Securities [Line Items]    
Trading securities $ 1,675,212 $ 1,956,923
Trading Securities, Net Unrealized Gain (Loss) 3,941 10,969
U.S. government agency debentures [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 63,334 63,765
Trading Securities, Net Unrealized Gain (Loss) 23 254
Residential agency mortgage-backed securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 1,480,458 1,791,584
Trading Securities, Net Unrealized Gain (Loss) 3,851 9,966
Municipal and other tax-exempt securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 44,105 34,507
Trading Securities, Net Unrealized Gain (Loss) (99) (1)
Asset-backed securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 36,928 42,656
Trading Securities, Net Unrealized Gain (Loss) 50 685
Other debt securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 50,387 24,411
Trading Securities, Net Unrealized Gain (Loss) $ 116 $ 65
v3.19.3
Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investments Securities, Amortized Cost $ 304,224 $ 355,187
Investment Securities, fair value 324,021 367,298
Investment Securities, Gross Unrealized Gain 20,232 14,408
Investment Securities, Gross Unrealized Loss (435) (2,297)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investments Securities, Debt Maturities, Amortized Cost 304,224 355,187
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Fair Value $ 324,021 $ 367,298
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 37 146
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 12,895 $ 31,627
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 13,110 94,802
Investment Securities, Continuous Unrealized Loss Position, Fair Value 26,005 126,429
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7 133
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 428 2,164
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 435 2,297
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 42,266  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 93,139  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 145,046  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 12,648  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 293,099  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 42,426  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 96,704  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 160,698  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 12,543  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 312,371  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 5.16  
Municipal and other tax-exempt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investments Securities, Amortized Cost $ 104,418 137,296
Investment Securities, fair value 107,647 138,562
Investment Securities, Gross Unrealized Gain 3,247 1,858
Investment Securities, Gross Unrealized Loss (18) (592)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investments Securities, Debt Maturities, Amortized Cost 104,418 137,296
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Fair Value $ 107,647 $ 138,562
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 18 72
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 10,302 $ 18,255
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,213 66,141
Investment Securities, Continuous Unrealized Loss Position, Fair Value 12,515 84,396
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 69
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15 523
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 18 592
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investments Securities, Amortized Cost 188,681 205,279
Investment Securities, fair value 204,724 215,966
Investment Securities, Gross Unrealized Gain 16,457 12,257
Investment Securities, Gross Unrealized Loss (414) (1,570)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investments Securities, Debt Maturities, Amortized Cost 188,681 205,279
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Fair Value $ 204,724 $ 215,966
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 18 72
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 275 $ 13,372
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 10,897 23,028
Investment Securities, Continuous Unrealized Loss Position, Fair Value 11,172 36,400
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 64
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 413 1,506
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 414 1,570
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investments Securities, Amortized Cost 11,125 12,612
Investment Securities, fair value 11,650 12,770
Investment Securities, Gross Unrealized Gain 528 293
Investment Securities, Gross Unrealized Loss (3) (135)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [2] 11,125  
Investments Securities, Debt Maturities, Amortized Cost 11,125 12,612
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value 11,650  
Investment Securities, Debt Maturities, Fair Value $ 11,650 $ 12,770
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 6 months  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,318 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 5,633
Investment Securities, Continuous Unrealized Loss Position, Fair Value 2,318 5,633
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 135
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 3 $ 135
[1]
Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[2]
The average expected lives of residential mortgage-backed securities were 4.5 years based upon current prepayment assumptions.
v3.19.3
Available for Sale Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 10,846,491   $ 10,846,491   $ 8,952,391
Available for sale securities 11,024,551   11,024,551   8,857,120
Available-for-sale Securities, Gross Unrealized Gain 191,716   191,716   42,986
Available-for-sale Securities, Gross Unrealized Loss (13,656)   (13,656)   (138,257)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds from sales of available for sale securities 261,028 $ 45,293 628,385 $ 232,826  
Available-for-sale Securities, Gross realized gains 989 250 7,316 700  
Available-for-sale Securities, Gross realized losses (984) 0 (6,206) (1,502)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 1 $ 64 282 $ (204)  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 10,800,000   10,800,000   9,100,000
Fixed Maturity Securities [Member]          
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 35,845   35,845    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,069,415   1,069,415    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,476,121   1,476,121    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 599,373   599,373    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 3,180,754   3,180,754    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 35,806   35,806    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,081,571   1,081,571    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,512,308   1,512,308    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 609,602   609,602    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 3,239,287   $ 3,239,287    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 8.29   8.29    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 2,294   $ 2,294   496
Available for sale securities 2,296   2,296   493
Available-for-sale Securities, Gross Unrealized Gain 2   2   0
Available-for-sale Securities, Gross Unrealized Loss 0   0   (3)
Municipal and other tax-exempt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 1,772   1,772   2,782
Available for sale securities 1,848   1,848   2,864
Available-for-sale Securities, Gross Unrealized Gain 76   76   82
Available-for-sale Securities, Gross Unrealized Loss 0   0   0
Commercial agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 3,176,188   3,176,188   2,986,297
Available for sale securities 3,234,671   3,234,671   2,953,889
Available-for-sale Securities, Gross Unrealized Gain 61,003   61,003   7,955
Available-for-sale Securities, Gross Unrealized Loss (2,520)   (2,520)   (40,363)
Other debt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 500   500   35,545
Available for sale securities 472   472   35,430
Available-for-sale Securities, Gross Unrealized Gain 0   0   12
Available-for-sale Securities, Gross Unrealized Loss (28)   (28)   (127)
Residential Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost [2] 7,665,737   7,665,737    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 7,785,264   $ 7,785,264    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities     4 years    
Residential agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 7,636,923   $ 7,636,923   5,886,323
Available for sale securities 7,740,461   7,740,461   5,804,708
Available-for-sale Securities, Gross Unrealized Gain 114,646   114,646   16,149
Available-for-sale Securities, Gross Unrealized Loss (11,108)   (11,108)   (97,764)
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 28,814   28,814   40,948
Available for sale securities 44,803   44,803   59,736
Available-for-sale Securities, Gross Unrealized Gain 15,989   15,989   18,788
Available-for-sale Securities, Gross Unrealized Loss $ 0   $ 0   $ 0
[1]
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2]
The average expected lives of residential mortgage-backed securities were 4.0 years based upon current prepayment assumptions.
v3.19.3
Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 166 490
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,381,046 $ 700,064
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 978,329 5,631,803
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,359,375 6,331,867
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4,872 1,615
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 8,784 136,642
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 13,656 $ 138,257
U.S. Treasury [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 493
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 493
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 0 $ 3
Residential agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 108 289
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 931,248 $ 510,824
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 753,448 3,641,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,684,696 4,152,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,260 1,158
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,848 96,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 11,108 $ 97,764
Commercial agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 57 197
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 449,798 $ 179,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 224,409 1,969,504
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 674,207 2,148,762
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,612 394
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 908 39,969
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 2,520 $ 40,363
Other debt securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 9,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 472 20,436
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 472 30,418
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 63
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 28 64
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 28 $ 127
v3.19.3
Securities Fair Value Option Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value $ 1,816,398 $ 283,235
Fair value option securities, Net Unrealized Gain (Loss) 19,515 2,766
U.S. Treasury [Member]    
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value 552,536 0
Fair value option securities, Net Unrealized Gain (Loss) 927 0
Residential agency mortgage-backed securities [Member]    
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value 1,263,862 283,235
Fair value option securities, Net Unrealized Gain (Loss) $ 18,588 $ 2,766
v3.19.3
Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 352,019 $ 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 336,791 362,306
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 78,780,596 [1] 30,272,764 [2]
Derivative Liabilities, Notional 80,366,050 [1] 33,838,893 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 675,084 571,793
Derivative Assets, Netting Adjustments (255,979) (135,530)
Derivative Assets, Net Fair Value Before Cash Collateral 419,105 436,263
Derivative Assets, Cash Collateral (67,086) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 352,019 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 657,258 574,347
Derivative Liabilities, Netting Adjustments (255,979) (135,530)
Derivative Liabilities, Net Fair Value Before Cash Collateral 401,279 438,817
Derivative Liabilities, Cash Collateral (64,488) (76,511)
Derivative Liabilities, Fair Value, Net of Cash Collateral 336,791 362,306
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 4,688,107 [1] 14,362,776 [2]
Derivative Liabilities, Notional 4,634,911 [1] 14,204,251 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 460,859 521,383
Derivative Assets, Netting Adjustments (59,681) (94,659)
Derivative Assets, Net Fair Value Before Cash Collateral 401,178 426,724
Derivative Assets, Cash Collateral (67,086) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 334,092 311,390
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 444,281 507,925
Derivative Liabilities, Netting Adjustments (59,681) (94,659)
Derivative Liabilities, Net Fair Value Before Cash Collateral 384,600 413,266
Derivative Liabilities, Cash Collateral (62,780) (69,196)
Derivative Liabilities, Fair Value, Net of Cash Collateral 321,820 344,070
Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 0 10,671,151
Derivative Liabilities, Notional 0 10,558,151
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 0 92,231
Derivative Assets, Netting Adjustments 0 (26,787)
Derivative Assets, Net Fair Value Before Cash Collateral 0 65,444
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 0 65,444
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 0 90,388
Derivative Liabilities, Netting Adjustments 0 (26,787)
Derivative Liabilities, Net Fair Value Before Cash Collateral 0 63,601
Derivative Liabilities, Cash Collateral 0 (63,596)
Derivative Liabilities, Fair Value, Net of Cash Collateral 0 5
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,399,788 1,924,131
Derivative Liabilities, Notional 2,399,788 1,924,131
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 67,157 36,112
Derivative Assets, Netting Adjustments (240) (6,688)
Derivative Assets, Net Fair Value Before Cash Collateral 66,917 29,424
Derivative Assets, Cash Collateral (277) (7,934)
Derviative contracts, net of cash collateral, Assets, Fair value 66,640 21,490
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 67,296 36,288
Derivative Liabilities, Netting Adjustments (240) (6,688)
Derivative Liabilities, Net Fair Value Before Cash Collateral 67,056 29,600
Derivative Liabilities, Cash Collateral (61,563) (4,110)
Derivative Liabilities, Fair Value, Net of Cash Collateral 5,493 25,490
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,980,406 1,472,209
Derivative Liabilities, Notional 1,936,369 1,434,247
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 183,204 206,418
Derivative Assets, Netting Adjustments (59,139) (60,983)
Derivative Assets, Net Fair Value Before Cash Collateral 124,065 145,435
Derivative Assets, Cash Collateral (66,149) (106,752)
Derviative contracts, net of cash collateral, Assets, Fair value 57,916 38,683
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 175,613 202,494
Derivative Liabilities, Netting Adjustments (59,139) (60,983)
Derivative Liabilities, Net Fair Value Before Cash Collateral 116,474 141,511
Derivative Liabilities, Cash Collateral (784) (1,490)
Derivative Liabilities, Fair Value, Net of Cash Collateral 115,690 140,021
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 15,538 21,210
Derivative Liabilities, Notional 15,547 21,214
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 470 842
Derivative Assets, Netting Adjustments (302) (201)
Derivative Assets, Net Fair Value Before Cash Collateral 168 641
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 168 641
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 451 812
Derivative Liabilities, Netting Adjustments (302) (201)
Derivative Liabilities, Net Fair Value Before Cash Collateral 149 611
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 149 611
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 209,515 184,990
Derivative Liabilities, Notional 200,347 177,423
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 206,914 183,759
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 206,914 183,759
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 206,914 183,759
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 197,807 175,922
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 197,807 175,922
Derivative Liabilities, Cash Collateral (433) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 197,374 175,922
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 82,860 89,085
Derivative Liabilities, Notional 82,860 89,085
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 3,114 2,021
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 3,114 2,021
Derivative Assets, Cash Collateral (660) (648)
Derviative contracts, net of cash collateral, Assets, Fair value 2,454 1,373
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 3,114 2,021
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 3,114 2,021
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 3,114 2,021
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 73,658,685 15,356,909
Derivative Liabilities, Notional 75,247,769 19,374,294
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 205,188 45,346
Derivative Assets, Netting Adjustments (193,306) (39,521)
Derivative Assets, Net Fair Value Before Cash Collateral 11,882 5,825
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 11,882 5,825
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 207,542 56,983
Derivative Liabilities, Netting Adjustments (193,306) (39,521)
Derivative Liabilities, Net Fair Value Before Cash Collateral 14,236 17,462
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 14,236 17,462
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 433,804 553,079
Derivative Liabilities, Notional 483,370 260,348
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 9,037 5,064
Derivative Assets, Netting Adjustments (2,992) (1,350)
Derivative Assets, Net Fair Value Before Cash Collateral 6,045 3,714
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 6,045 3,714
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 5,435 9,439
Derivative Liabilities, Netting Adjustments (2,992) (1,350)
Derivative Liabilities, Net Fair Value Before Cash Collateral 2,443 8,089
Derivative Liabilities, Cash Collateral (1,708) (7,315)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 735 $ 774
[1]
Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
[2]
Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
v3.19.3
Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue $ 8,314 $ 14,639 $ 21,070 $ 32,477
Gain (Loss) on Derivatives, Net 3,778 (2,847) 19,595 (11,589)
To-be-announced residential mortgage-backed securities [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 1,667 7,272 9,579 21,677
Gain (Loss) on Derivatives, Net 0 0 0 0
Interest rate swaps [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 1,252 618 2,787 2,057
Gain (Loss) on Derivatives, Net 0 0 0 0
Energy contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 1,611 541 3,923 5,097
Gain (Loss) on Derivatives, Net 0 0 0 0
Agricultural contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 16 6 24 36
Gain (Loss) on Derivatives, Net 0 0 0 0
Foreign exchange contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 138 78 392 350
Gain (Loss) on Derivatives, Net 0 0 0 0
Equity option contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 0 0 0 0
Gain (Loss) on Derivatives, Net 0 0 0 0
Total customer risk management programs        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 4,684 8,515 16,705 29,217
Gain (Loss) on Derivatives, Net 0 0 0 0
Trading [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 3,630 6,124 4,365 3,260
Gain (Loss) on Derivatives, Net 0 0 0 0
Internal risk management programs [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 0 0 0 0
Gain (Loss) on Derivatives, Net $ 3,778 $ (2,847) $ 19,595 $ (11,589)
v3.19.3
Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest $ 6,136,400 $ 5,749,373
Loans, variable rate of interest 15,976,501 15,744,110
Loans, non-accrual 172,466 163,247
Total 22,285,367 21,656,730
Accruing loans past due (90 days) [1] 1,541 1,338
Credit Commitments [Abstract]    
Outstanding commitments to extend credit 11,000,000  
Outstanding standby letters of credit 713,000  
Commercial [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 3,184,237 2,251,188
Loans, variable rate of interest 11,128,682 11,285,049
Loans, non-accrual 111,706 99,841
Total 14,424,625 13,636,078
Commercial real estate [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 1,070,050 1,477,274
Loans, variable rate of interest 3,532,822 3,265,918
Loans, non-accrual 23,185 21,621
Total 4,626,057 4,764,813
Residential mortgage [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 1,690,286 1,830,224
Loans, variable rate of interest 389,713 358,254
Loans, non-accrual 37,304 41,555
Total 2,117,303 2,230,033
Personal [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 191,827 190,687
Loans, variable rate of interest 925,284 834,889
Loans, non-accrual 271 230
Total $ 1,117,382 $ 1,025,806
[1]
Excludes residential mortgage loans guaranteed by agencies of the U.S. government
v3.19.3
Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Allowance for loan losses [Roll Forward]            
Beginning balance $ 202,534 $ 215,142 $ 207,457 $ 230,682    
Provision for loan losses 12,539 4,408 25,426 709    
Loans charged off (11,707) (11,073) (36,709) (29,068)    
Recoveries 1,066 2,092 8,258 8,246    
Ending balance 204,432 210,569 204,432 210,569    
Allowance for off-balance sheet credit losses [Roll Forward]            
Beginning balance 1,903 2,433 1,790 3,734    
Provision for off-balance sheet credit losses (539) (408) (426) (1,709)    
Ending balance 1,364 2,025 1,364 2,025    
Total provision for credit losses 12,000 4,000 25,000 (1,000)    
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         $ 22,112,901 $ 21,493,483
Individually measured for impairment, recorded investment         172,466 163,247
Total         22,285,367 21,656,730
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         179,144 180,957
Individually measured for impairment, related allowance         7,533 8,732
Total 204,432 215,142 204,432 210,569 204,432 207,457
Commercial [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance 106,397 113,722 102,226 124,269    
Provision for loan losses 9,861 (1,285) 34,740 2,720    
Loans charged off (9,875) (9,602) (31,728) (24,940)    
Recoveries 260 1,263 1,405 2,049    
Ending balance 106,643 104,098 106,643 104,098    
Allowance for off-balance sheet credit losses [Roll Forward]            
Beginning balance 1,742 2,361 1,655 3,644    
Provision for off-balance sheet credit losses (536) (424) (449) (1,707)    
Ending balance 1,206 1,937 1,206 1,937    
Total provision for credit losses 9,325 (1,709) 34,291 1,013    
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         14,312,919 13,536,237
Individually measured for impairment, recorded investment         111,706 99,841
Total         14,424,625 13,636,078
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         99,110 93,494
Individually measured for impairment, related allowance         7,533 8,732
Total 106,397 113,722 102,226 104,098 106,643 102,226
Commercial real estate [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance 54,188 58,758 60,026 56,621    
Provision for loan losses 102 1,391 (10,075) 248    
Loans charged off 0 0 (118) 0    
Recoveries 60 40 4,517 3,320    
Ending balance 54,350 60,189 54,350 60,189    
Allowance for off-balance sheet credit losses [Roll Forward]            
Beginning balance 116 17 52 45    
Provision for off-balance sheet credit losses (3) 19 61 (9)    
Ending balance 113 36 113 36    
Total provision for credit losses 99 1,410 (10,014) 239    
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         4,602,872 4,743,192
Individually measured for impairment, recorded investment         23,185 21,621
Total         4,626,057 4,764,813
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         54,350 60,026
Individually measured for impairment, related allowance         0 0
Total 54,188 58,758 60,026 56,621 54,350 60,026
Residential mortgage [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance 15,724 18,544 17,964 18,451    
Provision for loan losses (253) 1 (2,660) (418)    
Loans charged off (56) (91) (192) (326)    
Recoveries 119 229 422 976    
Ending balance 15,534 18,683 15,534 18,683    
Allowance for off-balance sheet credit losses [Roll Forward]            
Beginning balance 44 53 52 43    
Provision for off-balance sheet credit losses 0 (3) (8) 7    
Ending balance 44 50 44 50    
Total provision for credit losses (253) (2) (2,668) (411)    
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         2,079,999 2,188,478
Individually measured for impairment, recorded investment         37,304 41,555
Total         2,117,303 2,230,033
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         15,534 17,964
Individually measured for impairment, related allowance         0 0
Total 15,724 18,544 15,534 18,451 15,534 17,964
Personal [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance 9,388 8,646 9,473 9,124    
Provision for loan losses 1,911 883 3,434 1,486    
Loans charged off (1,776) (1,380) (4,671) (3,802)    
Recoveries 627 560 1,914 1,901    
Ending balance 10,150 8,709 10,150 8,709    
Allowance for off-balance sheet credit losses [Roll Forward]            
Beginning balance 1 2 31 2    
Provision for off-balance sheet credit losses 0 0 (30) 0    
Ending balance 1 2 1 2    
Total provision for credit losses 1,911 883 3,404 1,486    
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         1,117,111 1,025,576
Individually measured for impairment, recorded investment         271 230
Total         1,117,382 1,025,806
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         10,150 9,473
Individually measured for impairment, related allowance         0 0
Total 9,388 8,646 10,150 9,124 10,150 9,473
Specific Allowance [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance     189,689      
Ending balance 186,677   186,677      
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         22,112,901 21,493,483
Individually measured for impairment, recorded investment         172,466 163,247
Total         22,285,367 21,656,730
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         179,144 180,957
Individually measured for impairment, related allowance         7,533 8,732
Total 186,677   186,677   186,677 189,689
Nonspecific Allowance [Member]            
Allowance for loan losses [Roll Forward]            
Beginning balance 16,837 15,472 17,768 22,217    
Provision for loan losses 918 3,418 (13) (3,327)    
Loans charged off 0 0 0 0    
Recoveries 0 0 0 0    
Ending balance 17,755 18,890 17,755 18,890    
Allowance for off-balance sheet credit losses [Roll Forward]            
Beginning balance 0 0 0 0    
Provision for off-balance sheet credit losses 0 0 0 0    
Ending balance 0 0 0 0    
Total provision for credit losses 918 3,418 (13) (3,327)    
Recorded investment [Abstract]            
Collectively measured for impairment, recorded investment         0 0
Individually measured for impairment, recorded investment         0 0
Total         0 0
Related allowance [Abstract]            
Collectively measured for impairment, related allowance         0 0
Individually measured for impairment, related allowance         0 0
Total $ 16,837 $ 15,472 $ 17,755 $ 22,217 $ 17,755 $ 17,768
v3.19.3
Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment $ 20,338,154   $ 19,805,403      
Non-Graded, Recorded Investment 1,947,213   1,851,327      
Total 22,285,367   21,656,730      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 171,275   171,272      
Non-Graded, Allowance 15,402   18,417      
Total 204,432 $ 202,534 207,457 $ 210,569 $ 215,142 $ 230,682
Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 14,396,278   13,586,654      
Non-Graded, Recorded Investment 28,347   49,424      
Total 14,424,625   13,636,078      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 105,714   101,303      
Non-Graded, Allowance 929   923      
Total 106,643 106,397 102,226 104,098 113,722 124,269
Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Total 4,114,269   3,590,333      
Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Total 3,266,249   3,258,192      
Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Total 1,848,617   1,621,158      
Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Total 698,408   730,521      
Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Total 3,032,968   2,799,277      
Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Total 744,840   804,550      
Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Total 719,274   832,047      
Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 4,626,057   4,764,813      
Non-Graded, Recorded Investment 0   0      
Total 4,626,057   4,764,813      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 54,350   60,026      
Non-Graded, Allowance 0   0      
Total 54,350 54,188 60,026 60,189 58,758 56,621
Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Total 135,361   148,584      
Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Total 799,169   919,082      
Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Total 1,014,275   1,072,920      
Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Total 1,324,839   1,288,065      
Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Total 873,536   778,106      
Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Total 478,877   558,056      
Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 283,297   505,046      
Non-Graded, Recorded Investment 1,834,006   1,724,987      
Total 2,117,303   2,230,033      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 3,375   3,310      
Non-Graded, Allowance 12,159   14,654      
Total 15,534 15,724 17,964 18,683 18,544 18,451
Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Total 1,066,460   1,122,610      
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Total 191,764   190,866      
Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Total 859,079   916,557      
Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,032,522   948,890      
Non-Graded, Recorded Investment 84,860   76,916      
Total 1,117,382   1,025,806      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 7,836   6,633      
Non-Graded, Allowance 2,314   2,840      
Total 10,150 9,388 9,473 8,709 8,646 9,124
Specific Allowance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 20,338,154   19,805,403      
Non-Graded, Recorded Investment 1,947,213   1,851,327      
Total 22,285,367   21,656,730      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 171,275   171,272      
Non-Graded, Allowance 15,402   18,417      
Total 186,677   189,689      
Nonspecific Allowance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 0   0      
Total 0   0      
Related Allowance [Abstract]            
Internally Risk Graded, Allowance 0   0      
Non-Graded, Allowance 0   0      
Total 17,755 $ 16,837 17,768 $ 18,890 $ 15,472 $ 22,217
Performing [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 1,910,190   1,811,557      
Performing [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 28,300   49,371      
Performing [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 28,300   49,371      
Performing [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 0   0      
Performing [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 1,797,239   1,685,424      
Performing [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 763,535   819,199      
Performing [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 185,432   183,734      
Performing [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 848,272   682,491      
Performing [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Non-Graded, Recorded Investment 84,651   76,762      
Performing [Member] | Pass [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 19,880,462   19,285,126      
Performing [Member] | Pass [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 13,996,035   13,135,068      
Performing [Member] | Pass [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,927,285   3,414,039      
Performing [Member] | Pass [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,185,367   3,167,203      
Performing [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,829,614   1,593,902      
Performing [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 652,804   668,438      
Performing [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,984,306   2,730,121      
Performing [Member] | Pass [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 744,840   804,550      
Performing [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 671,819   756,815      
Performing [Member] | Pass [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 4,571,803   4,712,826      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 135,011   148,234      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 765,708   885,588      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,007,136   1,059,334      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,316,856   1,287,471      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 872,627   776,898      
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 474,465   555,301      
Performing [Member] | Pass [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 280,243   492,976      
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 280,243   269,678      
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   223,298      
Performing [Member] | Pass [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,032,381   944,256      
Performing [Member] | Other Loans Especially Mentioned [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 179,389   181,960      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 159,767   157,866      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 60,405   42,176      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 38,118   49,761      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 9,757   18,809      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 24,229   30,934      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 25,205   14,920      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,053   1,266      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 19,250   23,927      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 12,067   11,926      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 5,203   10,532      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,196   281      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 784   1,188      
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 326   52      
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 326   52      
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Other Loans Especially Mentioned [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 46   115      
Performing [Member] | Accruing Substandard [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 142,860   214,840      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 128,817   193,932      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 37,685   86,624      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 36,645   32,661      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 7,742   7,131      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 12,634   22,230      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 17,479   37,698      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Accruing Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 16,632   7,588      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 11,819   6,439      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,262   1,289      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,081   3,054      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 6,501   12      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   1,208      
Performing [Member] | Accruing Substandard [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,975   876      
Performing [Member] | Accruing Substandard [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,191   10,026      
Performing [Member] | Accruing Substandard [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,191   9,730      
Performing [Member] | Accruing Substandard [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Performing [Member] | Accruing Substandard [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   296      
Performing [Member] | Accruing Substandard [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 33   4,443      
Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 135,444   123,476      
Non-Graded, Recorded Investment 37,022   39,771      
Nonaccrual [Member] | Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 111,659   99,788      
Non-Graded, Recorded Investment 47   53      
Nonaccrual [Member] | Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 88,894   47,494      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 6,119   8,567      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,504   1,316      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 8,741   8,919      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 5,978   16,538      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Public finance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 423   16,954      
Non-Graded, Recorded Investment 47   53      
Nonaccrual [Member] | Commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 23,185   21,621      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 350   350      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 20,132   20,279      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 855   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 286   301      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 909   0      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 653   691      
Non-Graded, Recorded Investment 0   0      
Nonaccrual [Member] | Residential mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 537   1,991      
Non-Graded, Recorded Investment 36,767   39,564      
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 537   1,991      
Non-Graded, Recorded Investment 19,628   21,960      
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 6,332   7,132      
Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0      
Non-Graded, Recorded Investment 10,807   10,472      
Nonaccrual [Member] | Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 63   76      
Non-Graded, Recorded Investment $ 208   $ 154      
v3.19.3
Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance $ 446,335 $ 446,335 $ 423,787
Impaired loans, recorded investment, total 357,898 357,898 346,981
Impaired loans, recorded investment with no related allowance 331,468 331,468 311,526
Impaired loans, recorded investment with related allowance 26,430 26,430 35,455
Impaired loans, related allowance 7,533 7,533 8,732
Impaired loans, average recorded investment 367,895 349,646  
Impaired loans, interest income recognized 2,300 6,757  
Commercial [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 186,205 186,205 156,163
Impaired loans, recorded investment, total 111,706 111,706 99,841
Impaired loans, recorded investment with no related allowance 85,276 85,276 64,386
Impaired loans, recorded investment with related allowance 26,430 26,430 35,455
Impaired loans, related allowance 7,533 7,533 8,732
Impaired loans, average recorded investment 117,551 99,544  
Impaired loans, interest income recognized 0 0  
Commercial [Member] | Energy [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 139,897 139,897 79,675
Impaired loans, recorded investment, total 88,894 88,894 47,494
Impaired loans, recorded investment with no related allowance 62,981 62,981 18,639
Impaired loans, recorded investment with related allowance 25,913 25,913 28,855
Impaired loans, related allowance 7,176 7,176 5,362
Impaired loans, average recorded investment 80,263 67,705  
Impaired loans, interest income recognized 0 0  
Commercial [Member] | Services [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 9,390 9,390 13,437
Impaired loans, recorded investment, total 6,119 6,119 8,567
Impaired loans, recorded investment with no related allowance 6,093 6,093 8,489
Impaired loans, recorded investment with related allowance 26 26 78
Impaired loans, related allowance 26 26 74
Impaired loans, average recorded investment 8,103 5,172  
Impaired loans, interest income recognized 0 0  
Commercial [Member] | Wholesale/retail [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 1,718 1,718 1,722
Impaired loans, recorded investment, total 1,504 1,504 1,316
Impaired loans, recorded investment with no related allowance 1,243 1,243 1,015
Impaired loans, recorded investment with related allowance 261 261 301
Impaired loans, related allowance 101 101 101
Impaired loans, average recorded investment 1,447 1,087  
Impaired loans, interest income recognized 0 0  
Commercial [Member] | Manufacturing [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 9,153 [1] 9,153 [1] 10,055
Impaired loans, recorded investment, total 8,741 [1] 8,741 [1] 8,919
Impaired loans, recorded investment with no related allowance 8,511 [1] 8,511 [1] 8,673
Impaired loans, recorded investment with related allowance 230 [1] 230 [1] 246
Impaired loans, related allowance 230 [1] 230 [1] 246
Impaired loans, average recorded investment [1] 8,677 8,448  
Impaired loans, interest income recognized [1] 0 0  
Impaired loans, unpaid principal balance to affiliates 4,700 4,700  
Commercial [Member] | Healthcare [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 17,786 17,786 24,319
Impaired loans, recorded investment, total 5,978 5,978 16,538
Impaired loans, recorded investment with no related allowance 5,978 5,978 10,563
Impaired loans, recorded investment with related allowance 0 0 5,975
Impaired loans, related allowance 0 0 2,949
Impaired loans, average recorded investment 11,063 8,547  
Impaired loans, interest income recognized 0 0  
Commercial [Member] | Public finance [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 0 0 0
Impaired loans, recorded investment, total 0 0 0
Impaired loans, recorded investment with no related allowance 0 0 0
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment   0  
Impaired loans, interest income recognized 0 0  
Commercial [Member] | Other commercial and industrial [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 8,261 8,261 26,955
Impaired loans, recorded investment, total 470 470 17,007
Impaired loans, recorded investment with no related allowance 470 470 17,007
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 7,998 8,585  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 24,685 24,685 30,138
Impaired loans, recorded investment, total 23,185 23,185 21,621
Impaired loans, recorded investment with no related allowance 23,185 23,185 21,621
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 22,427 22,403  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member] | Residential construction and land development [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 1,306 1,306 1,306
Impaired loans, recorded investment, total 350 350 350
Impaired loans, recorded investment with no related allowance 350 350 350
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 350 350  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member] | Retail [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 20,516 20,516 27,680
Impaired loans, recorded investment, total 20,132 20,132 20,279
Impaired loans, recorded investment with no related allowance 20,132 20,132 20,279
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 20,094 20,206  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member] | Office [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 855 855 0
Impaired loans, recorded investment, total 855 855 0
Impaired loans, recorded investment with no related allowance 855 855 0
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 855 427  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member] | Multifamily [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 286 286 301
Impaired loans, recorded investment, total 286 286 301
Impaired loans, recorded investment with no related allowance 286 286 301
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 281 294  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member] | Industrial [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 909 909 0
Impaired loans, recorded investment, total 909 909 0
Impaired loans, recorded investment with no related allowance 909 909 0
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 454 454  
Impaired loans, interest income recognized 0 0  
Commercial real estate [Member] | Other commercial real estate [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 813 813 851
Impaired loans, recorded investment, total 653 653 691
Impaired loans, recorded investment with no related allowance 653 653 691
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 393 672  
Impaired loans, interest income recognized 0 0  
Residential mortgage [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 235,107 235,107 237,208
Impaired loans, recorded investment, total 222,736 222,736 225,289
Impaired loans, recorded investment with no related allowance 222,736 222,736 225,289
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 227,663 227,448  
Impaired loans, interest income recognized 2,300 6,757  
Residential mortgage [Member] | Permanent mortgage [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 24,639 24,639 28,716
Impaired loans, recorded investment, total 20,165 20,165 23,951
Impaired loans, recorded investment with no related allowance 20,165 20,165 23,951
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 20,984 22,058  
Impaired loans, interest income recognized 280 894  
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 197,847 [2] 197,847 [2] 196,296 [3]
Impaired loans, recorded investment, total 191,764 [2] 191,764 [2] 190,866 [3]
Impaired loans, recorded investment with no related allowance 191,764 [2] 191,764 [2] 190,866 [3]
Impaired loans, recorded investment with related allowance 0 [2] 0 [2] 0 [3]
Impaired loans, related allowance 0 [2] 0 [2] 0 [3]
Impaired loans, average recorded investment [2] 196,310 194,751  
Impaired loans, interest income recognized [2] 2,020 5,863  
Residential mortgage [Member] | Home equity [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 12,621 12,621 12,196
Impaired loans, recorded investment, total 10,807 10,807 10,472
Impaired loans, recorded investment with no related allowance 10,807 10,807 10,472
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 0
Impaired loans, average recorded investment 10,369 10,639  
Impaired loans, interest income recognized 0 0  
Personal [Member]      
Impaired loans [Abstract]      
Impaired loans, unpaid principal balance 338 338 278
Impaired loans, recorded investment, total 271 271 230
Impaired loans, recorded investment with no related allowance 271 271 230
Impaired loans, recorded investment with related allowance 0 0 0
Impaired loans, related allowance 0 0 $ 0
Impaired loans, average recorded investment 254 251  
Impaired loans, interest income recognized $ 0 $ 0  
[1]
Impaired manufacturing sector loans included $4.7 million of loans from an affiliated entity, with no allowance as the fair value of the collateral exceeded the outstanding principal balance at September 30, 2019.
[2] All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At September 30, 2019, the majority were accruing based on the guarantee by U.S. government agencies.
[3]
All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2018, the majority were accruing based on the guarantee by U.S. government agencies.
v3.19.3
Loans and Allowances for Credit Losses, Troubled Debt Restructurings (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Troubled Debt Restructuring, Recorded Investment $ 145.0   $ 145.0   $ 166.0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms 70.0   70.0   71.0
Financing Receivable, Troubled Debt Restructuring, Postmodification 6.2 $ 31.0 40.0 $ 76.0  
Permanent mortgages guaranteed by US government agencies [Member] | Accruing [Member] | Residential mortgage [Member]          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Troubled Debt Restructuring, Recorded Investment $ 93.0   $ 93.0   $ 86.0
v3.19.3
Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Financing receivable, recorded investment, aging [Abstract]    
Current $ 21,938,836,000 $ 21,308,989,000
Nonaccrual 172,466,000 163,247,000
Total 22,285,367,000 21,656,730,000
Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 14,297,027,000 13,521,894,000
Nonaccrual 111,706,000 99,841,000
Total 14,424,625,000 13,636,078,000
Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,025,375,000 3,542,839,000
Nonaccrual 88,894,000 47,494,000
Total 4,114,269,000 3,590,333,000
Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,249,994,000 3,237,578,000
Nonaccrual 6,119,000 8,567,000
Total 3,266,249,000 3,258,192,000
Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,844,203,000 1,619,290,000
Nonaccrual 1,504,000 1,316,000
Total 1,848,617,000 1,621,158,000
Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 687,358,000 721,204,000
Nonaccrual 8,741,000 8,919,000
Total 698,408,000 730,521,000
Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,026,838,000 2,781,944,000
Nonaccrual 5,978,000 16,538,000
Total 3,032,968,000 2,799,277,000
Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 744,840,000 804,550,000
Nonaccrual 0 0
Total 744,840,000 804,550,000
Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 718,419,000 814,489,000
Nonaccrual 470,000 17,007,000
Total 719,274,000 832,047,000
Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,595,305,000 4,725,669,000
Nonaccrual 23,185,000 21,621,000
Total 4,626,057,000 4,764,813,000
Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 134,947,000 147,705,000
Nonaccrual 350,000 350,000
Total 135,361,000 148,584,000
Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 779,037,000 884,424,000
Nonaccrual 20,132,000 20,279,000
Total 799,169,000 919,082,000
Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,013,420,000 1,072,920,000
Nonaccrual 855,000 0
Total 1,014,275,000 1,072,920,000
Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,318,148,000 1,287,483,000
Nonaccrual 286,000 301,000
Total 1,324,839,000 1,288,065,000
Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 872,627,000 776,898,000
Nonaccrual 909,000 0
Total 873,536,000 778,106,000
Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 477,126,000 556,239,000
Nonaccrual 653,000 691,000
Total 478,877,000 558,056,000
Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,929,616,000 2,037,128,000
Nonaccrual 37,304,000 41,555,000
Total 2,117,303,000 2,230,033,000
Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,036,793,000 1,095,097,000
Nonaccrual 20,165,000 23,951,000
Total 1,066,460,000 1,122,610,000
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 47,207,000 37,459,000
Nonaccrual 6,332,000 7,132,000
Total 191,764,000 190,866,000
Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 845,616,000 904,572,000
Nonaccrual 10,807,000 10,472,000
Total 859,079,000 916,557,000
Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,116,888,000 1,024,298,000
Nonaccrual 271,000 230,000
Total 1,117,382,000 1,025,806,000
30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 51,586,000 53,350,000
30 to 59 Days [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 12,955,000 7,675,000
30 to 59 Days [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,305,000 6,009,000
30 to 59 Days [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,910,000 515,000
30 to 59 Days [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,309,000 392,000
30 to 59 Days [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 94,000 241,000
30 to 59 Days [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 337,000 518,000
30 to 59 Days [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 6,740,000 16,529,000
30 to 59 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 249,000
30 to 59 Days [Member] | Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 14,379,000
30 to 59 Days [Member] | Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days [Member] | Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 6,405,000 281,000
30 to 59 Days [Member] | Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 1,208,000
30 to 59 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 335,000 412,000
30 to 59 Days [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 31,791,000 28,667,000
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 6,097,000 3,196,000
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 23,412,000 24,369,000
30 to 59 Days [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,282,000 1,102,000
30 to 59 Days [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 100,000 479,000
60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 27,801,000 24,245,000
60 to 89 Days [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,146,000 6,106,000
60 to 89 Days [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,096,000 6,038,000
60 to 89 Days [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 37,000
60 to 89 Days [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 6,000
60 to 89 Days [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,000 0
60 to 89 Days [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 48,000 25,000
60 to 89 Days [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 106,000 280,000
60 to 89 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 280,000
60 to 89 Days [Member] | Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 106,000 0
60 to 89 Days [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 25,455,000 17,063,000
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 3,405,000 366,000
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 21,676,000 16,345,000
60 to 89 Days [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 374,000 352,000
60 to 89 Days [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 94,000 796,000
90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 94,678,000 106,899,000
90 Days or More [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 791,000 562,000
90 Days or More [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 735,000 0
90 Days or More [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 56,000 554,000
90 Days or More [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 8,000
90 Days or More [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 721,000 714,000
90 Days or More [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 64,000 0
90 Days or More [Member] | Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 657,000 714,000
90 Days or More [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 93,137,000 105,620,000
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 93,137,000 105,561,000
90 Days or More [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 59,000
90 Days or More [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due $ 29,000 $ 3,000
v3.19.3
Leasing Leasing (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Mar. 31, 2019
Leases [Abstract]      
Operating Lease, Right-of-Use Asset $ 180.0 $ 180.0 $ 137.0
Lease, Cost [Abstract]      
Weighted-average remaining lease term 11 years 11 years  
Weighted-average discount rate operating leases 3.20% 3.20%  
Operating lease cost recognized as occupancy and equipment expense $ 7.1 $ 19.3  
Operating cash flows from operating leases 5.9 17.3  
Short-term Lease, Cost 3.3 10.9  
Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract]      
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months 7.0 7.0  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two 29.6 29.6  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three 27.4 27.4  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four 20.3 20.3  
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five 18.6 18.6  
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five $ 136.3 $ 136.3  
v3.19.3
Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Schedule of Residential Mortgage Loans Held For Sale [Line Items]    
Number of days for past due for loan to be considered nonperforming (in days) 90 days 90 days
Residential mortgage loans held for sale, nonperforming $ 0 $ 0
Credit losses recognized on residential mortgage loans held for sale 0 0
Components of Residential Mortgage Loans Held for Sale [Abstract]    
Unpaid principal balance 269,610 145,057
Residential mortgage loans held for sale, Fair value 272,489 146,971
Residential mortgage loans held for sale $ 282,487 $ 149,221
Residential Mortgage Loan Commitments [Member] | Not Designated as Hedging Instrument [Member]    
Schedule of Residential Mortgage Loans Held For Sale [Line Items]    
General number of days outstanding for residential mortgage commitments, minimum (in days) 60 days 60 days
General number of days outstanding for residential mortgage commitments, maximum (in days) 90 days 90 days
Components of Residential Mortgage Loans Held for Sale [Abstract]    
Derivative, Notional Amount $ 379,377 $ 160,848
Derivative, Net fair value $ 10,111 $ 5,378
Forward sales contracts [Member] | Not Designated as Hedging Instrument [Member]    
Schedule of Residential Mortgage Loans Held For Sale [Line Items]    
General number of days for delivery of loans, for which the price is set by forward sales contracts, minimum (in days) 60 days 60 days
General number of days for delivery for loans, for which the price is set by forward sales contracts, maximum (in days) 90 days 90 days
Components of Residential Mortgage Loans Held for Sale [Abstract]    
Derivative, Notional Amount $ 649,161 $ 274,000
Derivative, Net fair value $ (113) $ (3,128)
v3.19.3
Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mortgage Banking Revenue [Abstract]        
Net realized gains on sale of mortgage loans $ 8,971 $ 9,063 $ 24,838 $ 28,699
Net change in unrealized gain on mortgage loans held for sale 97 (2,135) 965 (2,457)
Net change in the fair value of mortgage loan commitments 514 (2,446) 4,733 (1,496)
Net change in the fair value of forward sales contracts 4,232 2,768 3,015 1,871
Total production revenue 13,814 7,250 33,551 26,617
Servicing revenue 16,366 16,286 48,594 49,290
Total mortgage banking revenue $ 30,180 $ 23,536 $ 82,145 $ 75,907
v3.19.3
Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Summary of Mortgage Servicing Rights [Abstract]          
Number of residential mortgage loans serviced for others 128,463   128,463   132,463
Outstanding principal balance of residential mortgage loans serviced for others $ 21,046,136,000   $ 21,046,136,000   $ 21,658,335,000
Weighted average interest rate 3.99%   3.99%   3.99%
Remaining term (in months)     290 months   293 months
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance $ 208,308,000 $ 278,719,000 $ 259,254,000 $ 252,867,000 $ 252,867,000
Additions, net 9,882,000 8,968,000 24,821,000 28,688,000  
Change in fair value due to principal payments (11,936,000) (8,986,000) (27,600,000) (25,783,000)  
Change in fair value due to market assumption changes (12,593,000) 5,972,000 (62,814,000) 28,901,000  
Ending balance $ 193,661,000 $ 284,673,000 $ 193,661,000 $ 284,673,000 $ 259,254,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]          
Discount rate - risk-free rate plus a market premium (in hundredths)     9.82%   9.90%
Prepayment rate - based upon loan interest rate, original term and loan type, minimum     8.31%   8.05%
Prepayment rate - based upon loan interest rate, original term and loan type, maximum     17.22%   15.74%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)     $ 68   $ 67
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan)     94   93
Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan)     150   150
Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan)     500   500
Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan)     1,000   1,000
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan)     $ 4,000   $ 4,000
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths)     1.51%   2.57%
Primary secondary mortgage rate spread 102   102   105
v3.19.3
Commitments and Contingent Liabilities (Details)
 9 Months Ended
Sep. 30, 2019
USD ($)
Judicial Ruling [Member] | Misuse of Revenues Pledged to Municipal Bonds [Member]  
Litigation Settlement [Abstract]  
Disgorged fees $ 1,067,721
Litigation Settlement, Amount Awarded to Other Party $ 600,000
Pending Litigation [Member] | Misuse of Revenues Pledged to Municipal Bonds [Member]  
Litigation Settlement [Abstract]  
Loss Contingency, Number of Plaintiffs 2
Alleged total of judgment against nursing home operator $ 8,000,000
Pending Litigation [Member] | Bank Participation in Fraudulent Sale of Securities by Principals [Member]  
Litigation Settlement [Abstract]  
Loss Contingency, Number of Plaintiffs 19
Outstanding principal accrued interest and other amounts upon sale of facilities securing payment of the bonds $ 20,000,000
Pending Litigation [Member] | Purchase of facilities from principals subject to SEC New Jersey proceedings [Member]  
Litigation Settlement [Abstract]  
Number of individuals who purchased facilities from the principals subject to SEC New Jersey proceedings 2
Outstanding principal, accrued interest and other amounts required by bond documents $ 60,000,000
Number of principals in SEC New Jersey proceedings 2
v3.19.3
Commitments and Contingent Liabilities Variable Interest Entities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Other Assets [Member]  
Variable Interest Entity [Line Items]  
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net $ 245
Other Liabilities [Member]  
Variable Interest Entity [Line Items]  
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net $ 70
v3.19.3
Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 29, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dividends declared (in dollars per share)   $ 0.50 $ 0.50 $ 1.50 $ 1.40    
Schedule of Accumulated Other Income (Loss) [Abstract]              
Balance, Beginning of Period       $ (72,585) $ (36,174)    
Transition adjustment for new accounting principle in period of adoption           $ 2,862 $ (2,709)
Net change in unrealized gain (loss)   $ 46,285 $ (35,941) 274,441 (166,464)    
Reclassification adjustments included in earnings:              
Loss (gain) on available for sale securities, net   (5) (250) (1,110) 802    
Other comprehensive income (loss), before income taxes   46,280 (36,191) 273,331 (165,662)    
Federal and state income taxes   11,096 (9,134) 66,993 [1] (42,183) [1]    
Other comprehensive income (loss), net of income taxes   35,184 (27,057) 206,338 (123,479)    
Balance, End of Period   133,753 (162,362) 133,753 (162,362)    
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]              
Schedule of Accumulated Other Income (Loss) [Abstract]              
Balance, Beginning of Period       (70,999) (35,385)    
Transition adjustment for new accounting principle in period of adoption             (2,709)
Net change in unrealized gain (loss)       274,441 (166,464)    
Reclassification adjustments included in earnings:              
Loss (gain) on available for sale securities, net       (1,110) 802    
Other comprehensive income (loss), before income taxes       273,331 (165,662)    
Federal and state income taxes [1]       66,993 (42,183)    
Other comprehensive income (loss), net of income taxes       206,338 (123,479)    
Balance, End of Period   135,339 (161,573) 135,339 (161,573)    
Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member]              
Schedule of Accumulated Other Income (Loss) [Abstract]              
Balance, Beginning of Period       (1,586) (789)    
Transition adjustment for new accounting principle in period of adoption             $ 0
Net change in unrealized gain (loss)       0 0    
Reclassification adjustments included in earnings:              
Loss (gain) on available for sale securities, net       0 0    
Other comprehensive income (loss), before income taxes       0 0    
Federal and state income taxes       0 0    
Other comprehensive income (loss), net of income taxes       0 0    
Balance, End of Period   $ (1,586) $ (789) $ (1,586) $ (789)    
Subsequent Event [Member]              
Dividends Payable, Date Declared Oct. 29, 2019            
Dividends declared (in dollars per share) $ 0.51            
Dividends Payable, Date to be Paid Nov. 27, 2019            
Dividends Payable, Date of Record Nov. 12, 2019            
[1]
Calculated using a 25 percent blended federal and state statutory tax rate.
v3.19.3
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator: [Abstract]        
Net income attributable to BOK Financial Corp. shareholders $ 142,231 $ 117,256 $ 390,406 $ 337,190
Less: Earnings allocated to participating securities 875 963 2,553 2,940
Numerator for basic earnings per share – income available to common shareholders 141,356 116,293 387,853 334,250
Effect of reallocating undistributed earnings of participating securities 1 1 1 1
Numerator for diluted earnings per share – income available to common shareholders $ 141,357 $ 116,294 $ 387,854 $ 334,251
Denominator: [Abstract]        
Weighted average shares outstanding (in shares) 71,033,405 65,438,849 71,425,855 65,455,306
Less: Participating securities included in weighted average shares (in shares) 437,098 537,754 472,311 571,987
Denominator for basic earnings per common share (in shares) 70,596,307 64,901,095 70,953,544 64,883,319
Dilutive effect of employee stock compensation plans (in shares) 13,617 33,256 15,301 36,409
Denominator for diluted earnings per common share (in shares) 70,609,924 64,934,351 70,968,845 64,919,728
Basic earnings per share (per share) $ 2.00 $ 1.79 $ 5.47 $ 5.15
Diluted earnings per share (per share) $ 2.00 $ 1.79 $ 5.47 $ 5.15
Excludes employee stock options with exercise prices greater than current market price. 0 0 0 0
v3.19.3
Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Net interest revenue from external sources $ 279,096 $ 240,883 $ 842,630 $ 699,181
Net interest revenue (expense) from internal sources 0 0 0 0
Net interest revenue 279,096 240,883 842,630 699,181
Provision for credit losses 12,000 4,000 25,000 (1,000)
Net interest revenue after provision for credit losses 267,096 236,883 817,630 700,181
Other operating revenue 186,450 167,941 515,785 480,329
Other operating expense 279,292 252,617 843,586 743,523
Net direct contribution 174,254 152,207 489,829 436,987
Gain (loss) on financial instruments, net 0 0 0 0
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 0 0 0 0
Corporate expense allocations 0 0 0 0
Net income before taxes 174,254 152,207 489,829 436,987
Federal and state income taxes 32,396 34,662 99,926 98,940
Net income 141,858 117,545 389,903 338,047
Net income attributable to non-controlling interests (373) 289 (503) 857
Net income attributable to BOK Financial Corp. shareholders 142,231 117,256 390,406 337,190
Average assets 43,582,110 33,695,817 41,380,843 33,775,495
Operating Segments [Member] | Commercial [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 243,944 187,417 699,239 529,958
Net interest revenue (expense) from internal sources (63,797) (42,270) (181,829) (107,715)
Net interest revenue 180,147 145,147 517,410 422,243
Provision for credit losses 9,505 8,047 27,574 18,781
Net interest revenue after provision for credit losses 170,642 137,100 489,836 403,462
Other operating revenue 48,832 40,522 128,055 123,245
Other operating expense 68,685 51,039 181,809 148,796
Net direct contribution 150,789 126,583 436,082 377,911
Gain (loss) on financial instruments, net 28 (3) 67 13
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 802 (1,869) 455 (6,102)
Corporate expense allocations 12,613 9,124 34,146 29,092
Net income before taxes 139,006 115,587 402,458 342,730
Federal and state income taxes 37,433 30,623 107,807 90,943
Net income 101,573 84,964 294,651 251,787
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 101,573 84,964 294,651 251,787
Average assets 23,973,067 18,499,979 22,288,129 18,124,571
Operating Segments [Member] | Consumer [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 27,580 20,005 75,353 63,504
Net interest revenue (expense) from internal sources 20,882 19,039 76,925 51,811
Net interest revenue 48,462 39,044 152,278 115,315
Provision for credit losses 1,841 1,451 4,654 3,890
Net interest revenue after provision for credit losses 46,621 37,593 147,624 111,425
Other operating revenue 51,221 44,024 142,780 135,291
Other operating expense 59,699 58,482 171,214 174,728
Net direct contribution 38,143 23,135 119,190 71,988
Gain (loss) on financial instruments, net 8,339 (7,229) 43,416 (36,901)
Change in fair value of mortgage servicing rights (12,593) 5,972 (62,814) 28,901
Gain (loss) on repossessed assets, net 214 (87) 409 (21)
Corporate expense allocations 11,776 11,037 35,369 33,283
Net income before taxes 22,327 10,754 64,832 30,684
Federal and state income taxes 5,687 2,739 16,513 7,816
Net income 16,640 8,015 48,319 22,868
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 16,640 8,015 48,319 22,868
Average assets 9,827,130 8,323,543 9,142,491 8,381,205
Operating Segments [Member] | Wealth Management [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 12,343 22,509 51,054 56,990
Net interest revenue (expense) from internal sources 10,723 6,267 27,213 26,431
Net interest revenue 23,066 28,776 78,267 83,421
Provision for credit losses (42) (84) (209) (238)
Net interest revenue after provision for credit losses 23,108 28,860 78,476 83,659
Other operating revenue 89,160 83,357 248,591 228,766
Other operating expense 71,619 62,256 202,579 188,691
Net direct contribution 40,649 49,961 124,488 123,734
Gain (loss) on financial instruments, net 0 7 0 7
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 0 0 0 0
Corporate expense allocations 9,416 11,127 26,943 31,084
Net income before taxes 31,233 38,841 97,545 92,657
Federal and state income taxes 8,027 9,975 25,076 23,824
Net income 23,206 28,866 72,469 68,833
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 23,206 28,866 72,469 68,833
Average assets 10,392,988 8,498,363 9,861,021 8,364,712
Funds Management and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources (4,771) 10,952 16,984 [1] 48,729
Net interest revenue (expense) from internal sources 32,192 16,964 77,691 [1] 29,473
Net interest revenue 27,421 27,916 94,675 [1] 78,202
Provision for credit losses 696 (5,414) (7,019) [1] (23,433)
Net interest revenue after provision for credit losses 26,725 33,330 101,694 [1] 101,635
Other operating revenue (2,763) 38 (3,641) [1] (6,973)
Other operating expense 79,289 80,840 287,984 [1] 231,308
Net direct contribution (55,327) (47,472) (189,931) [1] (136,646)
Gain (loss) on financial instruments, net (8,367) 7,225 (43,483) [1] 36,881
Change in fair value of mortgage servicing rights 12,593 (5,972) 62,814 [1] (28,901)
Gain (loss) on repossessed assets, net (1,016) 1,956 (864) [1] 6,123
Corporate expense allocations (33,805) (31,288) (96,458) [1] (93,459)
Net income before taxes (18,312) (12,975) (75,006) [1] (29,084)
Federal and state income taxes (18,751) (8,675) (49,470) [1] (23,643)
Net income 439 (4,300) (25,536) [1] (5,441)
Net income attributable to non-controlling interests (373) 289 (503) [1] 857
Net income attributable to BOK Financial Corp. shareholders 812 (4,589) (25,033) [1] (6,298)
Average assets $ (611,075) $ (1,626,068) $ 89,202 [1] $ (1,094,993)
[1]
CoBiz operations are included in Funds Management and Other for the first quarter of 2019 and subsequently allocated to the respective segments in the second quarter of 2019.
v3.19.3
Fees and Commissions Revenue Fees and Commissions (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total fees and commissions $ 186,119 $ 166,197 $ 522,779 $ 483,069
Fees and commissions revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 186,119 166,197 522,779 483,069
Fees and commission revenue not from contracts with customers 74,529 [1] 47,089 [2] 193,585 [3] 159,009 [4]
Fees and commissions revenue from contracts with customers 111,590 [5] 119,108 [6] 329,194 [7] 324,060 [8]
Brokerage and trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 43,840 23,086 115,983 80,222
Fees and commission revenue not from contracts with customers 32,537 [1] 14,754 [2] 82,785 [3] 55,550 [4]
Fees and commissions revenue from contracts with customers 11,303 [5] 8,332 [6] 33,198 [7] 24,672 [8]
Trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 24,091 4,830 58,890 21,562
Fees and commission revenue not from contracts with customers 24,091 [1] 4,830 [2] 58,890 [3] 21,562 [4]
Fees and commissions revenue from contracts with customers 0 [5] 0 [6] 0 [7] 0 [8]
Customer hedging revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 4,684 8,514 16,706 29,216
Fees and commission revenue not from contracts with customers 4,684 [1] 8,514 [2] 16,706 [3] 29,216 [4]
Fees and commissions revenue from contracts with customers 0 [5] 0 [6] 0 [7] 0 [8]
Retail brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 4,204 4,325 12,127 13,505
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 4,204 [5] 4,325 [6] 12,127 [7] 13,505 [8]
Insurance brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2,862 170 10,792 555
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 2,862 170 10,792 [7] 555 [8]
Investment banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 7,999 5,247 17,468 15,384
Fees and commission revenue not from contracts with customers 3,762 [1] 1,410 [2] 7,189 [3] 4,772 [4]
Fees and commissions revenue from contracts with customers 4,237 [5] 3,837 [6] 10,279 [7] 10,612 [8]
Transaction card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 22,015 21,396 64,668 63,361
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 22,015 [5] 21,396 [6] 64,668 [7] 63,361 [8]
TransFund EFT network revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 19,464 19,387 57,541 57,596
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 19,464 [5] 19,387 [6] 57,541 [7] 57,596 [8]
Merchant services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2,217 2,009 6,516 5,765
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 2,217 [5] 2,009 [6] 6,516 [7] 5,765 [8]
Corporate card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 334 0 611 0
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 334 [5] 0 [6] 611 [7] 0 [8]
Fiduciary and asset management revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 43,621 57,514 132,004 141,038
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 43,621 [5] 57,514 [6] 132,004 [7] 141,038 [8]
Personal trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 20,238 35,823 61,028 76,479
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 20,238 [5] 35,823 [6] 61,028 [7] 76,479 [8]
Corporate trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 6,205 5,741 18,736 16,317
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 6,205 [5] 5,741 [6] 18,736 [7] 16,317 [8]
Institutional trust & retirement plan services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 10,740 11,094 32,919 33,587
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 10,740 [5] 11,094 [6] 32,919 [7] 33,587 [8]
Investment management services and other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 6,438 4,856 19,321 14,655
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 6,438 [5] 4,856 [6] 19,321 [7] 14,655 [8]
Deposit service charges and fees [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 28,837 27,765 85,154 82,760
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 28,837 [5] 27,765 [6] 85,154 [7] 82,760 [8]
Commercial account service charge revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 11,613 11,244 35,988 35,036
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 11,613 [5] 11,244 [6] 35,988 [7] 35,036 [8]
Overdraft fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 9,732 9,541 27,096 27,057
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 9,732 [5] 9,541 [6] 27,096 [7] 27,057 [8]
Check card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 5,721 5,254 16,464 15,515
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 5,721 [5] 5,254 [6] 16,464 [7] 15,515 [8]
Automated service charge and other deposit fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1,771 1,726 5,606 5,152
Fees and commission revenue not from contracts with customers 0 [1] 0 [2] 0 [3] 0 [4]
Fees and commissions revenue from contracts with customers 1,771 [5] 1,726 [6] 5,606 [7] 5,152 [8]
Mortgage banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 30,180 23,536 82,145 75,907
Fees and commission revenue not from contracts with customers 30,180 [1] 23,536 [2] 82,145 [3] 75,907 [4]
Fees and commissions revenue from contracts with customers 0 [5] 0 [6] 0 [7] 0 [8]
Mortgage production revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 13,814 7,250 33,551 26,617
Fees and commission revenue not from contracts with customers 13,814 [1] 7,250 [2] 33,551 [3] 26,617 [4]
Fees and commissions revenue from contracts with customers 0 [5] 0 [6] 0 [7] 0 [8]
Mortgage servicing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 16,366 16,286 48,594 49,290
Fees and commission revenue not from contracts with customers 16,366 [1] 16,286 [2] 48,594 [3] 49,290 [4]
Fees and commissions revenue from contracts with customers 0 [5] 0 [6] 0 [7] 0 [8]
Other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 17,626 12,900 42,825 39,781
Fees and commission revenue not from contracts with customers 11,812 [1] 8,799 [2] 28,655 [3] 27,552 [4]
Fees and commissions revenue from contracts with customers 5,814 [5] 4,101 [6] 14,170 [7] 12,229 [8]
Operating Segments [Member] | Commercial [Member] | Fees and commissions revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 46,159 39,391 125,310 122,282
Operating Segments [Member] | Commercial [Member] | Brokerage and trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 6,691 3,115 14,588 11,993
Operating Segments [Member] | Commercial [Member] | Trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Customer hedging revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2,283 1,350 6,243 6,264
Operating Segments [Member] | Commercial [Member] | Retail brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Insurance brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Investment banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 4,408 1,765 8,345 5,729
Operating Segments [Member] | Commercial [Member] | Transaction card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 20,996 20,392 61,572 60,367
Operating Segments [Member] | Commercial [Member] | TransFund EFT network revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 18,465 18,397 54,623 54,647
Operating Segments [Member] | Commercial [Member] | Merchant services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2,203 1,995 6,351 5,720
Operating Segments [Member] | Commercial [Member] | Corporate card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 328 0 598 0
Operating Segments [Member] | Commercial [Member] | Fiduciary and asset management revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Personal trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Corporate trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Institutional trust & retirement plan services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Investment management services and other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Deposit service charges and fees [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 10,887 10,424 32,113 32,543
Operating Segments [Member] | Commercial [Member] | Commercial account service charge revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 10,609 10,294 31,296 32,150
Operating Segments [Member] | Commercial [Member] | Overdraft fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 81 95 248 283
Operating Segments [Member] | Commercial [Member] | Check card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Automated service charge and other deposit fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 197 35 569 110
Operating Segments [Member] | Commercial [Member] | Mortgage banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Mortgage production revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Mortgage servicing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Commercial [Member] | Other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 7,585 5,460 17,037 17,379
Operating Segments [Member] | Consumer [Member] | Fees and commissions revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 51,461 44,038 143,112 135,334
Operating Segments [Member] | Consumer [Member] | Brokerage and trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Customer hedging revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Retail brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Insurance brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Investment banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Transaction card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1,034 1,023 3,018 3,050
Operating Segments [Member] | Consumer [Member] | TransFund EFT network revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1,020 1,009 2,975 3,005
Operating Segments [Member] | Consumer [Member] | Merchant services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 14 14 43 45
Operating Segments [Member] | Consumer [Member] | Corporate card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Fiduciary and asset management revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Personal trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Corporate trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Institutional trust & retirement plan services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Investment management services and other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Consumer [Member] | Deposit service charges and fees [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 17,310 16,694 49,315 48,220
Operating Segments [Member] | Consumer [Member] | Commercial account service charge revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 467 366 1,283 1,087
Operating Segments [Member] | Consumer [Member] | Overdraft fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 9,603 9,413 26,971 26,665
Operating Segments [Member] | Consumer [Member] | Check card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 5,721 5,254 16,299 15,515
Operating Segments [Member] | Consumer [Member] | Automated service charge and other deposit fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1,519 1,661 4,762 4,953
Operating Segments [Member] | Consumer [Member] | Mortgage banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 30,643 23,998 83,568 77,294
Operating Segments [Member] | Consumer [Member] | Mortgage production revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 13,815 7,250 33,554 26,617
Operating Segments [Member] | Consumer [Member] | Mortgage servicing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 16,828 16,748 50,014 50,677
Operating Segments [Member] | Consumer [Member] | Other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2,474 2,323 7,211 6,770
Operating Segments [Member] | Wealth Management [Member] | Fees and commissions revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 89,422 83,562 248,603 228,858
Operating Segments [Member] | Wealth Management [Member] | Brokerage and trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 37,070 19,815 96,712 67,034
Operating Segments [Member] | Wealth Management [Member] | Trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 24,091 4,830 58,890 21,562
Operating Segments [Member] | Wealth Management [Member] | Customer hedging revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1,810 6,935 9,444 21,511
Operating Segments [Member] | Wealth Management [Member] | Retail brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 4,204 4,398 12,192 13,751
Operating Segments [Member] | Wealth Management [Member] | Insurance brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 3,375 170 7,063 555
Operating Segments [Member] | Wealth Management [Member] | Investment banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 3,590 3,482 9,123 9,655
Operating Segments [Member] | Wealth Management [Member] | Transaction card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (17) (21) (49) (61)
Operating Segments [Member] | Wealth Management [Member] | TransFund EFT network revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (23) (21) (60) (61)
Operating Segments [Member] | Wealth Management [Member] | Merchant services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Wealth Management [Member] | Corporate card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 6 0 11 0
Operating Segments [Member] | Wealth Management [Member] | Fiduciary and asset management revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 43,663 57,561 130,413 141,190
Operating Segments [Member] | Wealth Management [Member] | Personal trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 20,239 35,822 61,028 76,481
Operating Segments [Member] | Wealth Management [Member] | Corporate trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 6,204 5,741 18,736 16,317
Operating Segments [Member] | Wealth Management [Member] | Institutional trust & retirement plan services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 10,740 11,095 32,919 33,584
Operating Segments [Member] | Wealth Management [Member] | Investment management services and other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 6,480 4,903 17,730 14,808
Operating Segments [Member] | Wealth Management [Member] | Deposit service charges and fees [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 638 639 1,941 1,970
Operating Segments [Member] | Wealth Management [Member] | Commercial account service charge revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 540 587 1,605 1,802
Operating Segments [Member] | Wealth Management [Member] | Overdraft fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 45 30 108 96
Operating Segments [Member] | Wealth Management [Member] | Check card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Wealth Management [Member] | Automated service charge and other deposit fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 53 22 228 72
Operating Segments [Member] | Wealth Management [Member] | Mortgage banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Wealth Management [Member] | Mortgage production revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Wealth Management [Member] | Mortgage servicing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 0 0 0
Operating Segments [Member] | Wealth Management [Member] | Other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 8,068 5,568 19,586 18,725
Funds Management and Other [Member] | Fees and commissions revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (923) [9] (794) 5,754 [10] (3,405)
Funds Management and Other [Member] | Brokerage and trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 79 [9] 156 4,683 [10] 1,195
Funds Management and Other [Member] | Trading revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 [9] 0 0 [10] 0
Funds Management and Other [Member] | Customer hedging revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 591 [9] 229 1,019 [10] 1,441
Funds Management and Other [Member] | Retail brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 [9] (73) (65) [10] (246)
Funds Management and Other [Member] | Insurance brokerage revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (513) [9] 0 3,729 [10] 0
Funds Management and Other [Member] | Investment banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1 [9] 0 0 [10] 0
Funds Management and Other [Member] | Transaction card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2 [9] 2 127 [10] 5
Funds Management and Other [Member] | TransFund EFT network revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2 [9] 2 3 [10] 5
Funds Management and Other [Member] | Merchant services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 [9] 0 122 [10] 0
Funds Management and Other [Member] | Corporate card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 [9] 0 2 [10] 0
Funds Management and Other [Member] | Fiduciary and asset management revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (42) [9] (47) 1,591 [10] (152)
Funds Management and Other [Member] | Personal trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (1) [9] 1 0 [10] (2)
Funds Management and Other [Member] | Corporate trust revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 1 [9] 0 0 [10] 0
Funds Management and Other [Member] | Institutional trust & retirement plan services revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 [9] (1) 0 [10] 3
Funds Management and Other [Member] | Investment management services and other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (42) [9] (47) 1,591 [10] (153)
Funds Management and Other [Member] | Deposit service charges and fees [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2 [9] 8 1,785 [10] 27
Funds Management and Other [Member] | Commercial account service charge revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (3) [9] (3) 1,804 [10] (3)
Funds Management and Other [Member] | Overdraft fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 3 [9] 3 (231) [10] 13
Funds Management and Other [Member] | Check card revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 0 [9] 0 165 [10] 0
Funds Management and Other [Member] | Automated service charge and other deposit fee revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions 2 [9] 8 47 [10] 17
Funds Management and Other [Member] | Mortgage banking revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (463) [9] (462) (1,423) [10] (1,387)
Funds Management and Other [Member] | Mortgage production revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (1) [9] 0 (3) [10] 0
Funds Management and Other [Member] | Mortgage servicing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions (462) [9] (462) (1,420) [10] (1,387)
Funds Management and Other [Member] | Other revenue [Member]        
Disaggregation of Revenue [Line Items]        
Total fees and commissions $ (501) [9] $ (451) $ (1,009) [10] $ (3,093)
[1]
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[2]
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[3]
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[4]
Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
[5]
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[6]
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[7]
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[8]
In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[9]
CoBiz operations are included in Funds Management and Other for the first quarter of 2019.
[10]
CoBiz operations are included in Funds Management and Other for the first quarter of 2019.
v3.19.3
Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Assets: [Abstract]            
Trading securities $ 1,675,212   $ 1,956,923      
Available for sale securities 11,024,551   8,857,120      
Fair value option securities 1,816,398   283,235      
Mortgage servicing rights 193,661 $ 208,308 259,254 $ 284,673 $ 278,719 $ 252,867
Derviative contracts, net of cash collateral, Assets, Fair value 352,019   320,929      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791   362,306      
U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 63,334   63,765      
Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 1,480,458   1,791,584      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 44,105   34,507      
Available for sale securities 1,848   2,864      
Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 36,928   42,656      
U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 2,296   493      
Fair value option securities 552,536   0      
Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 44,803   59,736      
Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 3,234,671   2,953,889      
Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 50,387   24,411      
Available for sale securities 472   35,430      
Fair Value, Recurring [Member]            
Assets: [Abstract]            
Trading securities 1,675,212   1,956,923      
Available for sale securities 11,024,551   8,857,120      
Fair value option securities 1,816,398          
Residential mortgage loans held for sale 282,487   149,221      
Mortgage servicing rights 193,661 [1]   259,254 [2]      
Derviative contracts, net of cash collateral, Assets, Fair value 352,019 [3]   320,929 [4]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791 [3]   362,306 [4]      
Fair Value, Recurring [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 63,334   63,765      
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 1,480,458   1,791,584      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Fair Value, Recurring [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 44,105   34,507      
Available for sale securities 1,848   2,864      
Fair Value, Recurring [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 36,928   42,656      
Fair Value, Recurring [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 44,803   59,736      
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 3,234,671   2,953,889      
Fair Value, Recurring [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 50,387   24,411      
Available for sale securities 472   35,430      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Residential mortgage loans held for sale 0   0      
Mortgage servicing rights 0 [1]   0 [2]      
Derviative contracts, net of cash collateral, Assets, Fair value 40,491 [3]   44,074 [4]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0 [3]   0 [4]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities 0   0      
Fair value option securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]            
Assets: [Abstract]            
Trading securities 1,675,212   1,956,923      
Available for sale securities 11,021,783   8,856,155      
Fair value option securities 1,263,862          
Residential mortgage loans held for sale 268,919   134,014      
Mortgage servicing rights 0 [1]   0 [2]      
Derviative contracts, net of cash collateral, Assets, Fair value 311,528 [3]   276,855 [4]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791 [3]   362,306 [4]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 63,334   63,765      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 1,480,458   1,791,584      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 44,105   34,507      
Available for sale securities 1,848   2,864      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 36,928   42,656      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 0   0      
Fair value option securities 0          
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 44,803   59,736      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 3,234,671   2,953,889      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 50,387   24,411      
Available for sale securities 0   34,958      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities 472   472      
Fair value option securities 0          
Residential mortgage loans held for sale 13,568   15,207      
Mortgage servicing rights 193,661 [1]   259,254 [2]      
Derviative contracts, net of cash collateral, Assets, Fair value 0 [3]   0 [4]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0 [3]   0 [4]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities 0   0      
Fair value option securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities     0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 0   0      
Fair value option securities 0          
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available for sale securities $ 472   $ 472      
[1]
A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
[2]
A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
[3]
See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded energy, interest rate and agricultural derivative contacts, net of cash margin. Derivative contacts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate derivative contracts, fully offset by cash margin.

[4]
See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural derivative contacts, net of cash margin. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate contracts, fully offset by cash margin.
v3.19.3
Fair Value Measurements, Measured On Recurring Basis Significant Unobservable Inputs (Details) - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Balance, beginning of period   $ 2,030   $ 4,802
Transfer to Level 3 from Level 2   0 [1]   0 [2]
Purchases   0   0
Proceeds from sales   0   0
Redemptions and distributions   (2,050)   (5,095)
Other comprehensive income (loss)   20   293
Balance, end of period   0   0
Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member] | Mortgage banking revenue [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Gain (loss) recognized in earnings   0   0
Available-for-sale securities [Member] | Other debt securities [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Balance, beginning of period $ 472 471 $ 472 472
Transfer to Level 3 from Level 2 0 [3] 0 [1] 0 [3] 0 [2]
Purchases 0 0 0 0
Proceeds from sales 0 0 0 0
Redemptions and distributions 0 0 0 0
Other comprehensive income (loss) 0 1 0 0
Balance, end of period 472 472 472 472
Available-for-sale securities [Member] | Other debt securities [Member] | Mortgage banking revenue [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Gain (loss) recognized in earnings 0 0 0 0
Residential mortgage loans held for sale [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Balance, beginning of period 16,073 14,243 15,207 12,299
Transfer to Level 3 from Level 2 261 [3] 2,862 [1] 2,150 [3] 5,603 [2]
Purchases 0 0 0 0
Proceeds from sales (3,152) (143) (4,531) (853)
Redemptions and distributions 0 0 0 0
Other comprehensive income (loss) 0 0 0 0
Balance, end of period 13,568 16,838 13,568 16,838
Residential mortgage loans held for sale [Member] | Mortgage banking revenue [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Gain (loss) recognized in earnings $ 386 $ (124) $ 742 $ (211)
[1]
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.
[2] Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.
[3]
Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.
v3.19.3
Fair Value Measurements Fair Value Measurements, Financial Instruments Measured On a Recurring Basis, Quantitative Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities $ 11,024,551 $ 8,857,120
Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities 472 35,430
Fair Value, Recurring [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities 11,024,551 8,857,120
Residential mortgage loans held for sale 282,487 149,221
Fair Value, Recurring [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities 472 35,430
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities 472 472
Residential mortgage loans held for sale 13,568 15,207
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities $ 472 $ 472
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average Yields On Comparable Short-term Taxable Securities Maximum 3.00% 3.00%
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential mortgage loans held for sale [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 96.36% 92.38%
Interest Rate Spread [Member] | Discounted Cash Flow [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available for sale securities $ 472 $ 472
Liquidity discount [Member] | Quoted prices of loans sold in securitization transactions, with a liquidity discount applied [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential mortgage loans held for sale [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residential mortgage loans held for sale $ 13,568 $ 15,207
Minimum [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of Interest Rates used to Value Securities 7.46% 7.88%
Range of fair value as a percentage of par value 94.42% 94.44%
Maximum [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of Interest Rates used to Value Securities 7.46% 7.88%
Range of fair value as a percentage of par value 94.42% 94.44%
Weighted Average [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale securities [Member] | Other debt securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range of Interest Rates used to Value Securities 7.46% 7.88%
Range of fair value as a percentage of par value 94.42% 94.44%
v3.19.3
Fair Value Measurements, Fair Value Measured On a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Impaired Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross charge-offs against allowance for loan losses $ 2,644 $ 9,086 $ 13,868 $ 16,279
Net losses (gains) and expenses of repossessed assets, net 0 0 0 0
Real estate and other repossessed assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gross charge-offs against allowance for loan losses 0 0 0 0
Net losses (gains) and expenses of repossessed assets, net (979) 2,161 (532) 7,388
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 0 0 0 0
Fair Value, Inputs, Level 1 [Member] | Real estate and other repossessed assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 0 0 0 0
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 79 1,065 79 1,065
Fair Value, Inputs, Level 2 [Member] | Real estate and other repossessed assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 5,044 4,608 5,044 4,608
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 9,810 24,428 9,810 24,428
Fair Value, Inputs, Level 3 [Member] | Real estate and other repossessed assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure $ 936 $ 6,545 $ 936 $ 6,545
v3.19.3
Fair Value Measurements Fair Value Measurement, Measured On Non-Recurring Basis, Signfiicant Unobservable Inputs, Quantitative Information (Details) - Fair Value, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Impaired Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 9,810 $ 24,428
Real estate and other repossessed assets [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 936 6,545
Discounted Cash Flow [Member] | Impaired Loans [Member] | Management knowledge of Industry [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 9,810 24,428
Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Marketability adjustments off appraised value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 936  
Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Recoverable oil and gas reserves, forward-looking commodity prices, and estimated operating costs [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure   $ 6,545
Minimum [Member] | Impaired Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance 8.00% 41.00%
Minimum [Member] | Real estate and other repossessed assets [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Measurement, Percentage of Appraised Value. Minimum 75.00%  
Maximum [Member] | Impaired Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance 76.00% 84.00%
Maximum [Member] | Real estate and other repossessed assets [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Measurement, Percentage of Appraised Value. Minimum 89.00%  
Weighted Average [Member] | Impaired Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance 28.00% 55.00%
Weighted Average [Member] | Real estate and other repossessed assets [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Measurement, Percentage of Appraised Value. Minimum 85.00%  
v3.19.3
Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities $ 1,675,212   $ 1,956,923      
Investment securities 304,224   355,187      
Available for sale securities 11,024,551   8,857,120      
Fair value option securities 1,816,398   283,235      
Residential mortgage loans held for sale 282,487   149,221      
Loans 22,285,367   21,656,730      
Allowance for loan losses (204,432) $ (202,534) (207,457) $ (210,569) $ (215,142) $ (230,682)
Loans, net of allowance 22,080,935   21,449,273      
Mortgage servicing rights 193,661 208,308 259,254 284,673 278,719 252,867
Derviative contracts, net of cash collateral, Assets, Fair value 352,019   320,929      
Time deposits 2,243,541   2,113,380      
Subordinated debentures 275,909   275,913      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791   362,306      
Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 14,424,625   13,636,078      
Allowance for loan losses (106,643) (106,397) (102,226) (104,098) (113,722) (124,269)
Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 4,626,057   4,764,813      
Allowance for loan losses (54,350) (54,188) (60,026) (60,189) (58,758) (56,621)
Residential mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,117,303   2,230,033      
Allowance for loan losses (15,534) (15,724) (17,964) (18,683) (18,544) (18,451)
Personal [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 1,117,382   1,025,806      
Allowance for loan losses (10,150) $ (9,388) (9,473) $ (8,709) $ (8,646) $ (9,124)
U.S. government agency debentures [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 63,334   63,765      
Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 1,480,458   1,791,584      
Investment securities 11,125   12,612      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Municipal and other tax-exempt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 44,105   34,507      
Investment securities 104,418   137,296      
Available for sale securities 1,848   2,864      
U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 2,296   493      
Fair value option securities 552,536   0      
Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 44,803   59,736      
Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 3,234,671   2,953,889      
Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 50,387   24,411      
Investment securities 188,681   205,279      
Available for sale securities 472   35,430      
Carrying (Reported) Amount, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 761,130   741,749      
Interest-bearing cash and cash equivalents 465,458   401,675      
Trading securities 1,675,212   1,956,923      
Investment securities 304,224   355,187      
Available for sale securities 11,024,551   8,857,120      
Fair value option securities 1,816,398          
Residential mortgage loans held for sale 282,487   149,221      
Loans 22,285,367   21,656,730      
Allowance for loan losses (204,432)   (207,457)      
Loans, net of allowance 22,080,935   21,449,273      
Mortgage servicing rights 193,661   259,254      
Derviative contracts, net of cash collateral, Assets, Fair value 352,019   320,929      
Deposits with no stated maturity 23,923,535   23,150,383      
Time deposits 2,243,541   2,113,380      
Other borrowed funds 10,235,385   7,142,801      
Subordinated debentures 275,909   275,913      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791   362,306      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 14,424,625   13,636,078      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 4,626,057   4,764,813      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,117,303   2,230,033      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Personal [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 1,117,382   1,025,806      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government agency debentures [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 63,334   63,765      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 1,480,458   1,791,584      
Investment securities 11,125   12,612      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 44,105   34,507      
Investment securities 104,418   137,296      
Available for sale securities 1,848   2,864      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Asset-backed securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 36,928   42,656      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 50,387   24,411      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 44,803   59,736      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 3,234,671   2,953,889      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 188,681   205,279      
Available for sale securities 472   35,430      
Estimate of Fair Value, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 761,130   741,749      
Interest-bearing cash and cash equivalents 465,458   401,675      
Trading securities 1,675,212   1,956,923      
Investment securities 324,021   367,298      
Available for sale securities 11,024,551   8,857,120      
Fair value option securities 1,816,398          
Residential mortgage loans held for sale 282,487   149,221      
Loans 22,265,792   21,478,228      
Allowance for loan losses 0   0      
Loans, net of allowance 22,265,792   21,478,228      
Mortgage servicing rights 193,661   259,254      
Derviative contracts, net of cash collateral, Assets, Fair value 352,019   320,929      
Deposits with no stated maturity 23,923,535   23,150,383      
Time deposits 2,241,778   2,073,538      
Other borrowed funds 10,193,602   7,071,953      
Subordinated debentures 276,393   261,977      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791   362,306      
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 14,397,846   13,526,162      
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 4,626,804   4,713,747      
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,132,158   2,213,951      
Estimate of Fair Value, Fair Value Disclosure [Member] | Personal [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 1,108,984   1,024,368      
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 63,334   63,765      
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 1,480,458   1,791,584      
Investment securities 11,650   12,770      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 44,105   34,507      
Investment securities 107,647   138,562      
Available for sale securities 1,848   2,864      
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 36,928   42,656      
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 50,387   24,411      
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 44,803   59,736      
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 3,234,671   2,953,889      
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 204,724   215,966      
Available for sale securities 472   35,430      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 761,130   741,749      
Interest-bearing cash and cash equivalents 465,458   401,675      
Trading securities 0   0      
Investment securities 0   0      
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Residential mortgage loans held for sale 0   0      
Loans 0   0      
Allowance for loan losses 0   0      
Loans, net of allowance 0   0      
Mortgage servicing rights 0   0      
Derviative contracts, net of cash collateral, Assets, Fair value 40,491   44,074      
Deposits with no stated maturity 0   0      
Time deposits 0   0      
Other borrowed funds 0   0      
Subordinated debentures 0   0      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Investment securities 0   0      
Available for sale securities 0   0      
Fair value option securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Investment securities 0   0      
Available for sale securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 2,296   493      
Fair value option securities 552,536          
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 0   0      
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 0   0      
Available for sale securities 0   0      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 0   0      
Interest-bearing cash and cash equivalents 0   0      
Trading securities 1,675,212   1,956,923      
Investment securities 126,999   159,237      
Available for sale securities 11,021,783   8,856,155      
Fair value option securities 1,263,862          
Residential mortgage loans held for sale 268,919   134,014      
Loans 0   0      
Allowance for loan losses 0   0      
Loans, net of allowance 0   0      
Mortgage servicing rights 0   0      
Derviative contracts, net of cash collateral, Assets, Fair value 311,528   276,855      
Deposits with no stated maturity 0   0      
Time deposits 0   0      
Other borrowed funds 0   0      
Subordinated debentures 276,393   261,977      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 336,791   362,306      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0   0      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 63,334   63,765      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 1,480,458   1,791,584      
Investment securities 11,650   12,770      
Available for sale securities 7,740,461   5,804,708      
Fair value option securities 1,263,862   283,235      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 44,105   34,507      
Investment securities 107,647   138,562      
Available for sale securities 1,848   2,864      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 36,928   42,656      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 50,387   24,411      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 0   0      
Fair value option securities 0          
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 44,803   59,736      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 3,234,671   2,953,889      
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 7,702   7,905      
Available for sale securities 0   34,958      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 0   0      
Interest-bearing cash and cash equivalents 0   0      
Trading securities 0   0      
Investment securities 197,022   208,061      
Available for sale securities 472   472      
Fair value option securities 0          
Residential mortgage loans held for sale 13,568   15,207      
Loans 22,265,792   21,478,228      
Allowance for loan losses 0   0      
Loans, net of allowance 22,265,792   21,478,228      
Mortgage servicing rights 193,661   259,254      
Derviative contracts, net of cash collateral, Assets, Fair value 0   0      
Deposits with no stated maturity 23,923,535   23,150,383      
Time deposits 2,241,778   2,073,538      
Other borrowed funds 10,193,602   7,071,953      
Subordinated debentures 0   0      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 14,397,846   13,526,162      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 4,626,804   4,713,747      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,132,158   2,213,951      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 1,108,984   1,024,368      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Investment securities 0   0      
Available for sale securities 0   0      
Fair value option securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Investment securities 0   0      
Available for sale securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 0   0      
Fair value option securities 0          
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 0   0      
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 197,022   208,061      
Available for sale securities $ 472   $ 472