BOK FINANCIAL CORP, 10-Q filed on 5/5/2021
Quarterly Report
v3.21.1
Document And Entity Information
 3 Months Ended
Mar. 31, 2021
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
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 69,557,873
Document Fiscal Year Focus 2021
Document Fiscal Period Focus Q1
Document Type 10-Q
Entity File Number 0-19341
Amendment Flag false
Document Period End Date Mar. 31, 2021
City Area Code 918
Local Phone Number 588-6000
Entity Address, Postal Zip Code 74192
v3.21.1
Consolidated Statements of Earnings (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Interest revenue [Abstract]    
Loans $ 197,574 $ 243,218
Residential mortgage loans held for sale 1,380 1,123
Trading securities 35,922 11,760
Investment securities 2,726 3,121
Available for sale securities 58,608 69,720
Fair value option securities 496 11,708
Restricted equity securities 1,359 5,894
Interest-bearing cash and cash equivalents 174 2,393
Total interest revenue 298,239 348,937
Interest expense [Abstract]    
Deposits 9,850 46,159
Borrowed funds 4,622 37,785
Subordinated debentures 3,347 3,633
Total interest expense 17,819 87,577
Net interest revenue 280,420 261,360
Provision for credit losses (25,000) 93,771
Net interest revenue after provision for credit losses 305,420 167,589
Total fees and commissions 162,152 192,724
Other gains (losses), net (3,036) (10,741)
Gain (loss) on derivatives, net (27,650) 18,420
Gain (loss) on fair value option securities, net (1,910) 68,393
Change in fair value of mortgage servicing rights 33,874 (88,480)
Gain on available for sale securities, net 467 3
Total other operating revenue 163,897 180,319
Other operating expense [Abstract]    
Personnel 173,010 156,181
Business promotion 2,154 6,215
Charitable contributions to BOKF Foundation 4,000 0
Professional fees and services 11,980 12,948
Net occupancy and equipment 26,662 26,061
Insurance 4,620 4,980
Data processing and communications 37,467 32,743
Printing, postage and supplies 3,440 4,272
Net losses (gains) and operating expenses of repossessed assets (6,588) 1,531
Amortization of intangible assets 4,807 5,094
Mortgage banking costs 13,943 10,545
Other expense 7,132 8,054
Total other operating expense 282,627 268,624
Net income before taxes 186,690 79,284
Federal and state income taxes 42,382 17,300
Net income 144,308 61,984
Net loss attributable to non-controlling interests (1,752) (95)
Net income attributable to BOK Financial Corporation shareholders $ 146,060 $ 62,079
Dividends declared per share $ 0.52 $ 0.51
Earnings Per Share [Abstract]    
Basic 2.10 0.88
Diluted $ 2.10 $ 0.88
Average shares used in computation: [Abstract]    
Basic 69,137,375 70,123,685
Diluted 69,141,710 70,130,166
Brokerage and trading revenue [Member]    
Total fees and commissions $ 20,782 $ 50,779
Transaction card revenue [Member]    
Total fees and commissions 22,430 21,881
Fiduciary and asset management revenue [Member]    
Total fees and commissions 41,322 44,458
Deposit service charges and fees [Member]    
Total fees and commissions 24,209 26,130
Mortgage banking revenue [Member]    
Total fees and commissions 37,113 37,167
Other revenue [Member]    
Total fees and commissions $ 16,296 $ 12,309
v3.21.1
Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income $ 144,308 $ 61,984
Other Comprehensive Income (Loss), before Tax [Abstract]    
Net change in unrealized gain (loss) (150,131) 297,843
Reclassification Adjustments Included in Earnings [Abstract]    
Gain on available for sale securities, net (467) (3)
Other comprehensive income (loss) before income taxes (150,598) 297,840
Federal and state income taxes (36,139) 71,471
Other comprehensive income (loss), net of income taxes (114,459) 226,369
Comprehensive income 29,849 288,353
Comprehensive loss attributable to non-controlling interests (1,752) (95)
Comprehensive income attributable to BOK Financial Corp. shareholders $ 31,601 $ 288,448
v3.21.1
Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets [Abstract]    
Cash and due from banks $ 723,983 $ 798,757
Interest-bearing cash and cash equivalents 695,213 381,816
Trading securities 5,085,949 4,707,975
Investment securities, net of allowance 226,121 244,843
Available for sale securities 13,410,057 13,050,665
Fair value option securities 72,498 114,982
Restricted equity securities 139,614 171,391
Residential mortgage loans held for sale 284,447 252,316
Loans and Leases Receivable, Gross 22,533,847 23,007,520
Allowance for loan losses (352,402) (388,640)
Loans, net of allowance 22,181,445 22,618,880
Premises and equipment, net 555,455 551,308
Receivables 250,852 245,880
Goodwill 1,048,091 1,048,091
Intangible assets, net 110,585 113,436
Mortgage servicing rights 132,915 101,172
Real estate and other repossessed assets, net of allowance 70,911 90,526
Derivative contracts, net 1,289,156 810,688
Cash surrender value of bank-owned life insurance 401,320 398,758
Receivable on unsettled securities sales 67,759 62,386
Other assets 696,142 907,218
Total assets 47,442,513 46,671,088
Deposits [Abstract]    
Noninterest-bearing demand deposits 13,103,170 12,266,338
Interest-bearing deposits: [Abstract]    
Transaction 21,890,874 21,158,422
Savings 854,226 751,992
Time 2,004,356 1,967,128
Total deposits 37,852,626 36,143,880
Funds purchased and repurchase agreements 795,161 1,662,386
Other borrowings 1,708,517 1,882,970
Subordinated debentures 276,024 276,005
Accrued interest, taxes and expense 290,328 323,667
Derivative contracts, net 719,556 405,779
Due on unsettled securities purchases 106,835 257,627
Other liabilities 431,122 427,213
Total liabilities 42,180,169 41,379,527
Shareholders' equity: [Abstract]    
Common stock 5 5
Capital surplus 1,371,735 1,368,062
Retained earnings 4,083,543 3,973,675
Treasury stock (437,230) (411,344)
Accumulated other comprehensive gain 221,409 335,868
Total shareholders’ equity 5,239,462 5,266,266
Non-controlling interests 22,882 25,295
Total equity 5,262,344 5,291,561
Total liabilities and equity $ 47,442,513 $ 46,671,088
v3.21.1
Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investment securities [Abstract]    
Investment Securities, Fair Value $ 252,707 $ 272,431
Real estate and other repossessed assets, allowance $ (15,507) $ (15,060)
Shareholders' equity: [Abstract]    
Common Stock, Par or Stated Value Per Share $ 0.00006 $ 0.00006
Common Stock, Shares Authorized 2,500,000,000 2,500,000,000
Common Stock, Shares, Issued (76,244,164) (75,995,205)
Common Stock, Shares, Outstanding (76,244,164) (75,995,205)
Treasury Stock, Shares 6,686,291 6,357,605
v3.21.1
Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjusted Balance
Cumulative Effect, Period of Adoption, Adjustment
Common Stock [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Capital Surplus [Member]
Capital Surplus [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock [Member]
Treasury Stock [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Total Shareholders' Equity [Member]
Total Shareholders' Equity [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Total Shareholders' Equity [Member]
Cumulative Effect, Period of Adoption, Adjustment
Non-Controlling Interests [Member]
Non-Controlling Interests [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
Balance, beginning of period (in shares) at Dec. 31, 2019       75,759 75,759           5,179 5,179              
Balance, beginning of period at Dec. 31, 2019 $ 4,863,919 $ 4,817,223   $ 5 $ 5 $ 1,350,995 $ 1,350,995 $ 3,729,778 $ 3,683,082   $ (329,906) $ (329,906) $ 104,923 $ 104,923 $ 4,855,795 $ 4,809,099   $ 8,124 $ 8,124
Balance, beginning of period (Accounting Standards Update 2016-13) at Dec. 31, 2019     $ (46,696)             $ (46,696)             $ (46,696)    
Net income 61,984             62,079             62,079     (95)  
Other comprehensive income (loss) 226,369                       226,369   226,369        
Repurchase of common stock (in shares)                     442                
Repurchase of common stock (33,380)                   $ (33,380)       (33,380)        
Stock options exercised (in shares)       10                              
Stock options exercised 586         586                 586        
Non-vested shares awarded, net (in shares)       232                              
Non-vested shares awarded, net           0                          
Vesting of non-vested shares (in shares)                     71                
Vesting of non-vested shares (5,608)                   $ (5,608)       (5,608)        
Share-based compensation 3,245         3,245                 3,245        
Cash dividends on common stock (36,142)             (36,142)             (36,142)        
Capital calls and distributions, net (117)                                 (117)  
Balance, end of period (in shares) at Mar. 31, 2020       76,001             5,692                
Balance, end of period at Mar. 31, 2020 5,034,160     $ 5   1,354,826   3,709,019     $ (368,894)   331,292   5,026,248     7,912  
Balance, beginning of period (in shares) at Dec. 31, 2020       75,995             6,358                
Balance, beginning of period at Dec. 31, 2020 5,291,561     $ 5   1,368,062   3,973,675     $ (411,344)   335,868   5,266,266     25,295  
Net income 144,308             146,060             146,060     (1,752)  
Other comprehensive income (loss) (114,459)                       (114,459)   (114,459)        
Repurchase of common stock (in shares)                     260                
Repurchase of common stock (20,071)                   $ (20,071)       (20,071)        
Stock options exercised (in shares)       17                              
Stock options exercised 949         949                 949        
Non-vested shares awarded, net (in shares)       232                              
Non-vested shares awarded, net           0                          
Vesting of non-vested shares (in shares)                     68                
Vesting of non-vested shares (5,815)                   $ (5,815)       (5,815)        
Share-based compensation 2,724         2,724                 2,724        
Cash dividends on common stock (36,192)             (36,192)             (36,192)        
Capital calls and distributions, net (661)                                 (661)  
Balance, end of period (in shares) at Mar. 31, 2021       76,244             6,686                
Balance, end of period at Mar. 31, 2021 $ 5,262,344     $ 5   $ 1,371,735   $ 4,083,543     $ (437,230)   $ 221,409   $ 5,239,462     $ 22,882  
v3.21.1
Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows From Operating Activities: [Abstract]    
Net income $ 144,308 $ 61,984
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]    
Provision for credit losses (25,000) 93,771
Change in fair value of mortgage servicing rights due to market assumption changes (33,874) 88,480
Change in the fair value of mortgage servicing rights due to principal payments 11,961 8,019
Net unrealized (gains) losses from derivative contracts 92,502 15,369
Share-based compensation 2,724 3,245
Depreciation and amortization 24,918 23,198
Net amortization of discounts and premiums 4,853 2,013
Net losses (gains) on financial instruments and other losses (gains), net (10,587) 10,742
Net gain on mortgage loans held for sale (19,045) (13,278)
Mortgage loans originated for sale (843,053) (548,956)
Proceeds from sale of mortgage loans held for sale 836,209 548,077
Capitalized mortgage servicing rights (9,830) (5,441)
Change in trading and fair value option securities (335,624) (1,092,249)
Change in receivables 15,650 (1,107,130)
Change in other assets (24,991) (24,503)
Change in other liabilities (49,998) 193,857
Net cash used in operating activities (218,877) (1,742,802)
Cash Flows From Investing Activities: [Abstract]    
Proceeds from maturities or redemptions of investment securities 18,624 19,079
Proceeds from maturities or redemptions of available for sale securities 877,257 394,205
Purchases of available for sale securities (1,451,909) (1,552,914)
Proceeds from sales of available for sale securities 56,037 26,894
Change in amount receivable on unsettled available for sale securities transactions (26,130) (22,113)
Loans originated, net of principal collected 498,667 (729,881)
Net payments on derivative asset contracts (7,016) (98,215)
Net change in restricted equity securities 31,777 70,510
Proceeds from disposition of assets 43,739 15,282
Purchases of assets (63,110) (40,295)
Net cash used in investing activities (22,064) (1,917,448)
Cash Flows From Financing Activities: [Abstract]    
Net change in demand deposits, transaction deposits and savings accounts 1,671,518 1,608,360
Net change in time deposits 37,228 14,624
Net change in other borrowed funds (1,078,174) 1,747,640
Net proceeds on derivative liability contracts 8,437 82,126
Net change in derivative margin accounts 2,995 (163,911)
Change in amount due on unsettled available for sale securities transactions (101,311) 160,211
Issuance of common and treasury stock, net (4,866) (5,022)
Repurchase of common stock (20,071) (33,380)
Dividends paid (36,192) (36,142)
Net cash provided by financing activities 479,564 3,374,506
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total 238,623 (285,744)
Cash and cash equivalents at beginning of period 1,180,573 1,258,821
Cash and cash equivalents at end of period 1,419,196 973,077
Supplemental Cash Flow Information: [Abstract]    
Cash paid for interest 16,743 87,468
Cash paid for taxes 852 853
Net loans and bank premises transferred to repossessed real estate and other assets 147 18,474
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period 36,496 20,277
Conveyance of other real estate owned guaranteed by U.S. government agencies 1,448 5,694
Right-of-use assets obtained in exchange for operating lease liabilities $ 1,191 $ 7,108
v3.21.1
Significant Accounting Policies
 3 Months Ended
Mar. 31, 2021
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 2020 Form 10-K filed with the Securities and Exchange Commission, which contains audited financial statements. Amounts presented as of December 31, 2020 have been derived from the audited financial statements included in BOK Financial’s 2020 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 three-month period ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.

Newly Adopted and Pending Accounting Policies

Financial Accounting Standards Board (“FASB”)

FASB Accounting Standards Update No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04")

On March 12, 2020, the FASB issued ASU 2020-04 which provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships that reference LIBOR or another reference rate expected to be discontinued, subject to meeting certain criteria. Under the new guidance, an entity can elect by accounting topic or industry subtopic to account for the modification of a contract affected by reference rate reform as a continuation of the existing contract, if certain conditions are met. In addition, the new guidance allows an entity to elect on a hedge-by-hedge basis to continue to apply hedge accounting for hedging relationships in which the critical terms change due to reference rate reform, if certain conditions are met. A one-time election to sell and/or transfer held-to-maturity debt securities that reference a rate affected by reference rate reform is also allowed. ASU 2020-04 became effective for all entities as of March 12, 2020 and will apply to all LIBOR reference rate modifications through December 31, 2022. Management is currently evaluating the impact of ASU 2020-04 on the Company's financial statements.

FASB Accounting Standards Update No. 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01")

On January 7, 2021, the FASB issued ASU 2021-01 which clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The amendments in this update are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. The amendments also optionally apply to all entities that designate receive-variable rate, pay-variable-rate cross-currency interest rate swaps as hedging instruments in net investment hedges that are modified as a result of reference rate reform. ASU 2021-01 is effective immediately for all entities and amendments may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020. Management is currently evaluating the impact of ASU 2021-01 on the Company's financial statements.
v3.21.1
Securities
 3 Months Ended
Mar. 31, 2021
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):
 
 March 31, 2021December 31, 2020
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
U.S. government securities$33,613 $(239)$9,183 $— 
Residential agency mortgage-backed securities
5,003,163 (10,647)4,669,148 (3,624)
Municipal securities27,047 (49)19,172 42 
Other debt securities22,126 (30)10,472 22 
Total trading securities$5,085,949 $(10,965)$4,707,975 $(3,560)
Investment Securities
 
The amortized cost and fair values of investment securities are as follows (in thousands):
 March 31, 2021
 AmortizedFairGross Unrealized
 CostValueGainLoss
Municipal securities$216,047 $241,278 $25,395 $(164)
Residential agency mortgage-backed securities
8,477 9,216 739 — 
Other debt securities2,214 2,213 — (1)
Total investment securities226,738 252,707 26,134 (165)
Allowance for credit losses(617)
Investment securities, net of allowance$226,121 $252,707 $26,134 $(165)
 December 31, 2020
 AmortizedFairGross Unrealized
 CostValueGainLoss
Municipal securities$229,245 $255,270 $26,169 $(144)
Residential agency mortgage-backed securities
8,913 9,790 877 — 
Other debt securities7,373 7,371 — (2)
Total investment securities245,531 272,431 27,046 (146)
Allowance for credit losses(688)
Investment securities, net of allowance$244,843 $272,431 $27,046 $(146)
The amortized cost and fair values of investment securities at March 31, 2021, 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$27,143 $76,456 $106,311 $8,351 $218,261 4.95 
Fair value27,866 85,490 121,763 8,372 243,491  
Residential mortgage-backed securities:      
Amortized cost    $8,477 2
Fair value    9,216  
Total investment securities:      
Amortized cost    $226,738  
Fair value    252,707  
1Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
2The average expected lives of residential mortgage-backed securities were 4.4 years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities
(in thousands):
March 31, 2021
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities6 $2,440 $51 $2,035 $113 $4,475 $164 
Other debt securities1 25 1 — — 25 1 
Total investment securities7 $2,465 $52 $2,035 $113 $4,500 $165 

December 31, 2020
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities6 $2,451 $40 $2,043 $104 $4,494 $144 
Other debt securities2 250 1 25 1 275 2 
Total investment securities8 $2,701 $41 $2,068 $105 $4,769 $146 
Available for Sale Securities 

The amortized cost and fair value of available for sale securities are as follows (in thousands):
 March 31, 2021
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$500 $506 $6 $— 
Municipal securities248,016 245,657 1,422 (3,781)
Mortgage-backed securities:    
Residential agency9,483,601 9,705,314 266,968 (45,255)
Residential non-agency15,890 31,382 15,492 — 
Commercial agency3,371,333 3,426,727 74,722 (19,328)
Other debt securities500 471 — (29)
Total available for sale securities$13,119,840 $13,410,057 $358,610 $(68,393)
 December 31, 2020
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$500 $508 $8 $— 
Municipal securities165,318 167,979 2,666 (5)
Mortgage-backed securities:   
Residential agency9,019,013 9,340,471 328,183 (6,725)
Residential non-agency17,563 32,770 15,207 — 
Commercial agency3,406,956 3,508,465 103,590 (2,081)
Other debt securities500 472 — (28)
Total available for sale securities$12,609,850 $13,050,665 $449,654 $(8,839)

The amortized cost and fair values of available for sale securities at March 31, 2021, 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$71,119 $1,562,072 $1,379,950 $607,208 $3,620,349 7.76 
Fair value71,223 1,610,227 1,373,270 618,641 3,673,361 
Residential mortgage-backed securities:
Amortized cost$9,499,491 2
Fair value9,736,696 
Total available-for-sale securities:
Amortized cost$13,119,840 
Fair value13,410,057 
1Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
2The average expected lives of residential mortgage-backed securities were 3.9 years based upon current prepayment assumptions.
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
 Three Months Ended March 31,
 20212020
Proceeds$56,037 $26,894 
Gross realized gains473 3 
Gross realized losses(6)— 
Related federal and state income tax expense (benefit)119 1 

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 $11.2 billion at March 31, 2021 and $11.6 billion at December 31, 2020. The secured parties do not have the right to sell or repledge these securities.

Temporarily Impaired Available for Sale Securities
(in thousands)
March 31, 2021
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available for sale:       
Municipal securities81 $186,267 $3,781 $— $— $186,267 $3,781 
Mortgage-backed securities:
    
Residential agency90 3,005,975 44,828 139,714 427 3,145,689 45,255 
Commercial agency60 711,113 18,623 305,406 705 1,016,519 19,328 
Other debt securities1 — — 471 29 471 29 
Total available for sale securities232 $3,903,355 $67,232 $445,591 $1,161 $4,348,946 $68,393 

December 31, 2020
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available for sale:     
Municipal securities1 $6,166 $5 $— $— $6,166 $5 
Mortgage-backed securities:
     
Residential agency
38 786,890 6,605 160,747 120 947,637 6,725 
Commercial agency
37 350,506 1,587 277,627 494 628,133 2,081 
Other debt securities1 — — 472 28 472 28 
Total available for sale securities
77 $1,143,562 $8,197 $438,846 $642 $1,582,408 $8,839 

Based on evaluations of impaired securities as of March 31, 2021, 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):
 March 31, 2021December 31, 2020
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
Residential agency mortgage-backed securities
$72,498 $3,233 $114,982 $4,463 
v3.21.1
Derivatives
 3 Months Ended
Mar. 31, 2021
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 enable them to manage their market risk 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. 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 5, 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 5 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 March 31, 2021 (in thousands):
Assets
 
Notional1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,221,571 $79,353 $(9,135)$70,218 $— $70,218 
Energy contracts3,930,367 618,401 (152,837)465,564 — 465,564 
Agricultural contracts32,893 1,629 (1,513)116 — 116 
Foreign exchange contracts346,897 343,101 — 343,101 (540)342,561 
Equity option contracts65,678 1,455 — 1,455 (300)1,155 
Total customer risk management programs7,597,406 1,043,939 (163,485)880,454 (840)879,614 
Trading67,796,867 785,765 (380,313)405,452 (774)404,678 
Internal risk management programs801,025 17,301 (12,437)4,864 — 4,864 
Total derivative contracts$76,195,298 $1,847,005 $(556,235)$1,290,770 $(1,614)$1,289,156 
Liabilities
 
Notional1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,221,571 $79,619 $(9,135)$70,484 $(60,429)$10,055 
Energy contracts3,897,430 602,728 (152,837)449,891 (443,933)5,958 
Agricultural contracts32,893 1,609 (1,513)96 — 96 
Foreign exchange contracts347,166 343,134 — 343,134 (24)343,110 
Equity option contracts65,678 1,455 — 1,455 — 1,455 
Total customer risk management programs7,564,738 1,028,545 (163,485)865,060 (504,386)360,674 
Trading66,746,760 834,430 (380,313)454,117 (99,371)354,746 
Internal risk management programs1,064,473 21,036 (12,437)8,599 (4,463)4,136 
Total derivative contracts$75,375,971 $1,884,011 $(556,235)$1,327,776 $(608,220)$719,556 
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, 2020 (in thousands):
Assets
 
Notional 1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,212,469 $113,524 $(144)$113,380 $— $113,380 
Energy contracts3,791,565 386,008 (211,468)174,540 — 174,540 
Agricultural contracts14,765 3,859 — 3,859 — 3,859 
Foreign exchange contracts337,001 332,257 — 332,257 (420)331,837 
Equity option contracts70,199 1,222 — 1,222 (285)937 
Total customer risk management programs7,425,999 836,870 (211,612)625,258 (705)624,553 
Trading84,997,593 440,627 (240,655)199,972 (26,958)173,014 
Internal risk management programs995,123 17,352 (4,231)13,121 — 13,121 
Total derivative contracts$93,418,715 $1,294,849 $(456,498)$838,351 $(27,663)$810,688 
Liabilities
 
Notional 1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,212,469 $113,900 $(144)$113,756 $(104,202)$9,554 
Energy contracts3,617,678 361,334 (211,468)149,866 (114,070)35,796 
Agricultural contracts14,781 3,844 — 3,844 (3,844)— 
Foreign exchange contracts336,223 331,035 — 331,035 (1,165)329,870 
Equity option contracts70,199 1,222 — 1,222 — 1,222 
Total customer risk management programs7,251,350 811,335 (211,612)599,723 (223,281)376,442 
Trading88,929,916 414,801 (240,655)174,146 (145,692)28,454 
Internal risk management programs145,256 5,529 (4,231)1,298 (415)883 
Total derivative contracts$96,326,522 $1,231,665 $(456,498)$775,167 $(369,388)$405,779 
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
March 31, 2021March 31, 2020
 Brokerage
and Trading Revenue		Gain (Loss) on Derivatives, NetBrokerage
and Trading
Revenue		Gain (Loss)on Derivatives, Net
Customer risk management programs:    
Interest rate contracts$1,388 $— $942 $— 
Energy contracts1,020 — 2,007 — 
Agricultural contracts18 — 15 — 
Foreign exchange contracts166 — 258 — 
Equity option contracts— — — — 
Total customer risk management programs2,592 — 3,222 — 
Trading1
(71,259)— (40,655)— 
Internal risk management programs— (27,650)— 18,420 
Total derivative contracts$(68,667)$(27,650)$(37,433)$18,420 
1    Represents changes in fair value of to-be-announced securities and other derivative instruments held to mitigate market risk of trading securities portfolio, which is offset by changes in fair value of trading securities also include in Brokerage and Trading Revenue in the Consolidated Statements of Earnings.
v3.21.1
Loans and Allowances for Credit Losses
 3 Months Ended
Mar. 31, 2021
Loans and Leases Receivable, Net Amount [Abstract]  
Loans [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. Accrued but not paid interest receivable is included in Receivables in the Consolidated Balance Sheets. 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.

For loans acquired with no evidence of credit deterioration, discounts are accreted on either an individual basis for loans with unique characteristics or on a pool basis for groups of homogeneous loans. Accretion is discontinued when a loan with an individually attributed discount is placed on nonaccruing status.

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. Payment deferrals up to six months are generally considered to be short-term modifications. 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 Consolidated 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. Internally risk graded loans are evaluated quarterly 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 to be impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. A portion of the principal balance continues to be guaranteed; 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):
 March 31, 2021December 31, 2020
Fixed
Rate		Variable
Rate		Non-accrualTotalFixed
Rate		Variable
Rate		Non-accrualTotal
Commercial$3,264,973 $9,245,738 $147,073 $12,657,784 $3,174,203 $9,736,173 $167,159 $13,077,535 
Commercial real estate
1,019,531 3,456,573 27,243 4,503,347 1,047,486 3,623,806 27,246 4,698,538 
Paycheck protection program1,848,550 — — 1,848,550 1,682,310 — — 1,682,310 
Loans to individuals2,146,671 1,335,792 41,703 3,524,166 2,174,874 1,333,975 40,288 3,549,137 
Total$8,279,725 $14,038,103 $216,019 $22,533,847 $8,078,873 $14,693,954 $234,693 $23,007,520 


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 March 31, 2021, outstanding commitments totaled $11.2 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 March 31, 2021, outstanding standby letters of credit totaled $714 million. 

Allowances for Credit Losses and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments

The allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments represent the portion of the amortized cost basis of loans that we do not expect to collect over the asset’s contractual life, considering past events, current conditions, and reasonable and supportable forecasts of future economic conditions. The appropriateness of the allowance for credit losses, including industry and product adjustments, is assessed quarterly by a senior management Allowance Committee. This review is based on an on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company.
The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics.

When full collection of principal or interest is uncertain, the loan’s risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss.

We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan’s amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan’s amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral’s fair value. Generally, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice serve as the basis for the fair value of real property held as collateral. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. For energy loans, our internal staff of engineers generally determines collateral value of mineral rights based on projected cash flows from proven oil and gas reserves under existing economic and operating conditions. For real property held as collateral for other loans, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice generally serve as the basis for the fair value. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. Our special assets staff generally determines the value of other collateral based on projected liquidation cash flows under current market conditions. We evaluate collateral values and available cash resources quarterly. Historical statistics may be used to estimate specific allowances in limited situations, such as when a collateral dependent loan is removed from the general allowance pool near the end of a reporting period until an appraisal of collateral value is received or a full assessment of future cash flows is completed.

General allowances estimate expected credit losses on pools of loans sharing similar risk characteristics that are expected to occur over the loan’s estimated remaining life. The loan’s estimated remaining life represents the contractual term adjusted for amortization, estimates of prepayments, and borrower-owned extension options. Approximately 90 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur.

Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10 percent of the committed dollars in the portfolio is calculated using charge-off migration.

The expected credit loss on approximately 1 percent of the committed dollars in the portfolio is calculated using a non-modeled approach. Specifically, the calculation applies a long-term net charge-off rate to the loan balances, adjusted for the weighted average remaining maturity of each portfolio.
    
In estimating the expected credit losses for general allowances on performing risk-graded loans, each portfolio class is assigned relevant economic loss drivers which best explain variations in portfolio net loss rates. The probability of default estimates for each portfolio class are adjusted for current and forecasted economic conditions. The result is applied to the exposure at default and loss given default to calculate the lifetime expected credit loss estimate. Selection of relevant economic loss drivers is re-evaluated periodically and involves statistical analysis as well as management judgment. The unemployment rate factors significantly in the allowance for loan losses calculation, affecting commercial and loans to individuals segments. Other primary factors impacting the commercial portfolio include BBB corporate spreads, real gross domestic product growth rate, and energy commodity prices. The primary commercial real estate variables are vacancy rate and BBB corporate spreads. In addition to the unemployment rate, the forecast for loans to individuals is tied to home price index. The forecasts may include regional economic factors when localized conditions diverge from national conditions.
An Economic Forecast Committee, consisting of senior management with members largely independent of the allowance process develops a twelve-month forward-looking forecast for the relevant economic loss drivers. Management develops these forecasts based on external data as well as a view of future economic conditions, which may include adjustments for regional conditions. The forecast includes three economic scenarios and probability weights for each scenario. The base forecast represents management's view of the most likely outcome, while the downside forecast reflects reasonably possible worsening economic conditions, and the upside forecast projects reasonably possible improving conditions.

At the end of the one-year reasonable and supportable forecast period, we transition from shorter-term expected losses to long-term loss averages for the loan’s estimated remaining life. The difference between short-term loss forecasts and long-term loss averages is run-off over the reversion horizon, up to three years, depending on the forecasted economic scenarios.

General allowances also consider the estimated impact of factors that are not captured in the modeled results or historical experience. These factors may increase or decrease modeled results by amounts determined by the Allowance Committee. Factors not captured in modeled results or historical experience may include for example, new lines of business, market conditions that have not been previously encountered, observed changes in credit risk that are not yet reflected in macro-economic factors, or economic conditions that impact loss given default assumptions.

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 that are not unconditionally cancelable by the bank. This accrual is included in other liabilities in the Consolidated Balance Sheets. The appropriateness of the accrual is determined in the same manner as the allowance for loan losses, with the added consideration of commitment usage over the remaining life for those loans that the bank can not unconditionally cancel.

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 is summarized as follows (in thousands):
Three Months Ended
March 31, 2021
 CommercialCommercial Real EstatePaycheck Protection ProgramLoans to IndividualsNonspecific AllowanceTotal
Allowance for loan losses:     
Beginning balance$254,934 $86,558 $— $47,148 $— $388,640 
Provision for loan losses(9,893)(4,579)— (7,298)— (21,770)
Loans charged off(15,345)(263)— (1,297)— (16,905)
Recoveries of loans previously charged off
1,676 30 — 731 — 2,437 
Ending Balance$231,372 $81,746 $— $39,284 — $352,402 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$14,422 $20,571 $— $1,928 $— $36,921 
Provision for off-balance sheet credit risk
(1,686)(2,273)— (85)— (4,044)
Ending Balance$12,736 $18,298 $— $1,843 $— $32,877 
Three Months Ended
March 31, 2020
 CommercialCommercial Real EstatePaycheck Protection ProgramLoans to IndividualsNonspecific AllowanceTotal
Allowance for loan losses:     
Beginning balance$118,187 $51,805 $— $23,572 $17,195 $210,759 
Transition adjustment33,681 (4,620)— 13,943 (17,195)25,809 
Beginning balance, adjusted151,868 47,185 — 37,515 — 236,568 
Provision for loan losses77,723 5,115 — 13,126 — 95,964 
Loans charged off(16,615)(886)— (1,416)— (18,917)
Recoveries of loans previously charged off
462 47 — 1,187 — 1,696 
Ending Balance$213,438 $51,461 $— $50,412 — $315,311 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$1,434 $107 $— $44 $— $1,585 
Transition adjustment10,144 11,660 — 1,748 — 23,552 
Beginning balance, adjusted11,578 11,767 — 1,792 — 25,137 
Provision for off-balance sheet credit risk
2,462 808 — 107 — 3,377 
Ending Balance$14,040 $12,575 $— $1,899 — $28,514 

Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the anticipated impact of the on-going COVID-19 pandemic, and other assumptions, resulted in a $31.1 million reduction in the allowance for lending activities during the first quarter of 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $5.2 million increase in the allowance for lending activities.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2021 is as follows (in thousands):
 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$12,510,711 $214,711 $147,073 $16,661 $12,657,784 $231,372 
Commercial real estate4,476,104 78,356 27,243 3,390 4,503,347 81,746 
Paycheck protection program1,848,550 — — — 1,848,550 — 
Loans to individuals3,482,463 39,284 41,703 — 3,524,166 39,284 
Total$22,317,828 $332,351 $216,019 $20,051 $22,533,847 $352,402 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2020 is as follows (in thousands):

 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$12,910,376 $235,882 $167,159 $19,052 $13,077,535 $254,934 
Commercial real estate4,671,292 83,169 27,246 3,389 4,698,538 86,558 
Paycheck protection program1,682,310 — — — 1,682,310 — 
Loans to individuals3,508,849 47,148 40,288 — 3,549,137 47,148 
Total$22,772,827 $366,199 $234,693 $22,441 $23,007,520 $388,640 

Credit Quality Indicators

The Company utilizes risk grading as primary credit quality indicators as it influences the probability of default which is a key attribute in the expected credit losses calculation. Substantially all commercial as well as commercial real estate loans and certain loans to individuals are risk graded based on a quarterly evaluation of the borrowers’ ability to repay the loans. Certain commercial loans and most loans to individuals are small, homogeneous pools that are not risk-graded. The credit quality of these loans is based on past due days in accordance with regulatory guidelines.

We have included in the credit quality indicator “pass” loans that 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.” This also includes 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 ("Special Mention") 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. Non-graded loans 30 to 59 days past due are categorized as Special Mention.

The risk grading process identified certain loans that have a well-defined weakness (for example, 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 remain on accruing status. Non-graded loans 60 to 89 days past due are categorized as Accruing Substandard.

Nonaccruing loans represent loans for which full collection of principal and interest is uncertain. This includes certain loans considered “substandard” and all loans considered “doubtful” by regulatory guidelines. Non-graded loans 90 or more days past due are categorized as Nonaccrual.

Probability of default is lowest for pass graded loans and increases for each credit quality indicator, Special Mention, and Accruing Substandard.

Vintage represents the year of origination, except for revolving loans which are considered in aggregate. Loans that were once revolving but have converted to term loans without additional underwriting appear in a separate vintage column.
The following table summarizes the Company’s loan portfolio at March 31, 2021 by the risk grade categories and vintage (in thousands): 
Origination Year
20212020201920182017PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Energy
Pass$63,102 $81,658 $51,881 $78,812 $6,731 $8,019 $2,388,115 $— $2,678,318 
Special Mention17,000 — — — — — 144,976 — 161,976 
Accruing Substandard
— 24,051 1,319 1,337 — 11,922 221,765 — 260,394 
Nonaccrual— 21,008 2,488 — — 13,340 64,964 — 101,800 
Total energy
80,102 126,717 55,688 80,149 6,731 33,281 2,819,820 — 3,202,488 
Healthcare
Pass114,646 570,755 617,791 615,371 394,541 780,397 153,973 — 3,247,474 
Special Mention— — — — — 504 5 — 509 
Accruing Substandard
— — 27,500 1,032 — 11,056 — — 39,588 
Nonaccrual— — 18 — — 2,660 509 — 3,187 
Total healthcare114,646 570,755 645,309 616,403 394,541 794,617 154,487 — 3,290,758 
Services
Pass182,186 542,579 381,122 327,241 300,688 1,005,483 574,095 627 3,314,021 
Special Mention— 138 1,446 1,008 7 1,844 1,971 — 6,414 
Accruing Substandard
— 421 11,238 18,435 5,288 9,471 28,627 — 73,480 
Nonaccrual— 4,732 448 766 14,369 7,033 685 — 28,033 
Total services182,186 547,870 394,254 347,450 320,352 1,023,831 605,378 627 3,421,948 
General business
Pass118,267 361,002 370,674 274,644 209,218 297,857 1,032,658 2,305 2,666,625 
Special Mention— 189 4,850 3,401 7,469 1,781 4,903 — 22,593 
Accruing Substandard
— 1,392 2,575 12,901 8,738 10,287 3,408 18 39,319 
Nonaccrual— 1,675 3,887 5,893 1,430 565 558 45 14,053 
Total general business
118,267 364,258 381,986 296,839 226,855 310,490 1,041,527 2,368 2,742,590 
Total commercial
495,201 1,609,600 1,477,237 1,340,841 948,479 2,162,219 4,621,212 2,995 12,657,784 
Commercial real estate:
Pass73,306 812,635 1,215,895 796,047 430,066 951,180 163,737 37 4,442,903 
Special Mention— — — 3,201 14,110 6,900 — — 24,211 
Accruing Substandard
— — — — 4,454 4,509 27 — 8,990 
Nonaccrual— — 8,300 — — 18,943 — — 27,243 
Total commercial real estate
73,306 812,635 1,224,195 799,248 448,630 981,532 163,764 37 4,503,347 
Origination Year
20212020201920182017PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Paycheck protection program:
Pass544,128 1,304,422 — — — — — — 1,848,550 
Total paycheck protection program544,128 1,304,422 — — — — — — 1,848,550 
Loans to individuals:
Residential mortgage
Pass124,830 534,781 119,866 100,259 103,645 433,347 318,319 23,567 1,758,614 
Special Mention— 22 — 1,851 — 3,429 204 74 5,580 
Accruing Substandard
— — — — — — 400 — 400 
Nonaccrual— 626 124 1,913 728 24,658 4,013 822 32,884 
Total residential mortgage
124,830 535,429 119,990 104,023 104,373 461,434 322,936 24,463 1,797,478 
Residential mortgage guaranteed by U.S. government agencies
Pass— 7,101 32,171 35,189 45,744 291,282 — — 411,487 
Nonaccrual— — — 873 — 7,691 — — 8,564 
Total residential mortgage guaranteed by U.S. government agencies
— 7,101 32,171 36,062 45,744 298,973 — — 420,051 
Personal:
Pass44,298 215,962 192,533 73,230 97,757 155,714 524,716 1,370 1,305,580 
Special Mention— 28 14 21 2 474 12 — 551 
Accruing Substandard
— — 215 — — 17 19 — 251 
Nonaccrual— 2 11 60 73 81 28 — 255 
Total personal
44,298 215,992 192,773 73,311 97,832 156,286 524,775 1,370 1,306,637 
Total loans to individuals
169,128 758,522 344,934 213,396 247,949 916,693 847,711 25,833 3,524,166 
Total loans
$1,281,763 $4,485,179 $3,046,366 $2,353,485 $1,645,058 $4,060,444 $5,632,687 $28,865 $22,533,847 
The following table summarizes the Company’s loan portfolio at December 31, 2020 by the risk grade categories and vintage (in thousands): 
Origination Year
20202019201820172016PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Energy
Pass$112,614 $51,863 $89,346 $7,178 $1,148 $7,956 $2,548,663 $— $2,818,768 
Special Mention— — — — — — 202,590 — 202,590 
Accruing Substandard
24,000 1,363 1,453 — 12,667 — 283,294 — 322,777 
Nonaccrual21,076 2,607 — — — 21,064 80,312 — 125,059 
Total energy
157,690 55,833 90,799 7,178 13,815 29,020 3,114,859 — 3,469,194 
Healthcare
Pass536,745 615,221 638,302 422,834 234,399 658,286 147,132 — 3,252,919 
Special Mention— 27,500 — — — 8,282 5 — 35,787 
Accruing Substandard
— — 1,191 929 132 11,387 — — 13,639 
Nonaccrual— 18 183 — — 2,935 509 — 3,645 
Total healthcare536,745 642,739 639,676 423,763 234,531 680,890 147,646 — 3,305,990 
Services
Pass534,853 436,384 372,867 307,374 373,785 683,936 665,491 682 3,375,372 
Special Mention150 9,057 389 291 2,038 2,000 3,063 — 16,988 
Accruing Substandard
429 6,380 26,008 6,027 5,030 7,954 38,797 — 90,625 
Nonaccrual4,833 448 — 12,590 1,049 6,138 540 — 25,598 
Total services540,265 452,269 399,264 326,282 381,902 700,028 707,891 682 3,508,583 
General business
Pass419,756 394,985 310,273 236,222 103,987 186,600 1,055,878 2,316 2,710,017 
Special Mention197 4,519 9,713 7,803 2,511 3,159 2,483 19 30,404 
Accruing Substandard
1,432 3,069 6,694 10,935 10,042 3,729 4,449 140 40,490 
Nonaccrual1,675 3,728 4,863 1,436 530 107 477 41 12,857 
Total general business
423,060 406,301 331,543 256,396 117,070 193,595 1,063,287 2,516 2,793,768 
Total commercial
1,657,760 1,557,142 1,461,282 1,013,619 747,318 1,603,533 5,033,683 3,198 13,077,535 
Commercial real estate:
Pass725,577 1,211,338 954,226 489,193 314,899 722,475 223,131 38 4,640,877 
Special Mention— — 259 12,311 2,725 5,831 — — 21,126 
Accruing Substandard
— — — 4,410 — 4,852 27 — 9,289 
Nonaccrual— 8,300 — 232 7,468 11,246 — — 27,246 
Total commercial real estate
725,577 1,219,638 954,485 506,146 325,092 744,404 223,158 38 4,698,538 
Origination Year
20202019201820172016PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Paycheck protection program:
Pass1,682,310 — — — — — — — 1,682,310 
Total paycheck protection program1,682,310 — — — — — — — 1,682,310 
Loans to individuals:
Residential mortgage
Pass564,325 149,832 120,875 124,930 158,801 348,292 335,259 24,553 1,826,867 
Special Mention33 11 2,094 — 59 318 950 10 3,475 
Accruing Substandard
— — 51 — — 34 272 76 433 
Nonaccrual648 104 1,658 784 2,010 22,415 3,835 774 32,228 
Total residential mortgage
565,006 149,947 124,678 125,714 160,870 371,059 340,316 25,413 1,863,003 
Residential mortgage guaranteed by U.S. government agencies
Pass4,859 33,880 34,464 43,099 58,264 226,380 — — 400,946 
Nonaccrual— — 545 — 309 6,887 — — 7,741 
Total residential mortgage guaranteed by U.S. government agencies
4,859 33,880 35,009 43,099 58,573 233,267 — — 408,687 
Personal:
Pass219,873 200,580 76,246 100,229 64,104 102,126 510,571 1,510 1,275,239 
Special Mention39 55 66 — 469 31 965 — 1,625 
Accruing Substandard
11 214 10 — — — 29 — 264 
Nonaccrual28 17 57 73 50 49 45 — 319 
Total personal
219,951 200,866 76,379 100,302 64,623 102,206 511,610 1,510 1,277,447 
Total loans to individuals
789,816 384,693 236,066 269,115 284,066 706,532 851,926 26,923 3,549,137 
Total loans
$4,855,463 $3,161,473 $2,651,833 $1,788,880 $1,356,476 $3,054,469 $6,108,767 $30,159 $23,007,520 
Nonaccruing Loans

A summary of nonaccruing loans at March 31, 2021 follows (in thousands): 
As of March 31, 2021
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Energy$101,800 $48,042 $53,758 $13,893 
Healthcare3,187 3,187 — — 
Services28,033 24,046 3,987 2,650 
General business14,053 13,935 118 118 
Total commercial147,073 89,210 57,863 16,661 
Commercial real estate27,243 13,642 13,601 3,390 
Loans to individuals:    
Residential mortgage32,884 32,884 — — 
Residential mortgage guaranteed by U.S. government agencies
8,564 8,564 — — 
Personal255 255 — — 
Total loans to individuals41,703 41,703 — — 
Total$216,019 $144,555 $71,464 $20,051 


A summary of nonaccruing loans at December 31, 2020 follows (in thousands): 
As of December 31, 2020
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Energy$125,059 $76,633 $48,426 $16,478 
Healthcare3,645 3,645 — — 
Services25,598 20,810 4,788 2,574 
General business12,857 12,857 — — 
Total commercial167,159 113,945 53,214 19,052 
Commercial real estate27,246 13,645 13,601 3,389 
Loans to individuals:    
Residential mortgage32,228 32,228 — — 
Residential mortgage guaranteed by U.S. government agencies
7,741 7,741 — — 
Personal319 319 — — 
Total loans to individuals40,288 40,288 — — 
Total$234,693 $167,878 $66,815 $22,441 
Troubled Debt Restructurings

At March 31, 2021 the Company had $186 million in troubled debt restructurings ("TDRs"), of which $155 million were accruing residential mortgage loans guaranteed by U.S. government agencies and $17 million were nonaccruing residential mortgage loans with no specific allowance necessary. Approximately $103 million of TDRs were performing in accordance with the modified terms.

At December 31, 2020, the Company had $187 million in TDRs, of which $152 million were accruing residential mortgage loans guaranteed by U.S. government agencies. Approximately $95 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 months ended March 31, 2021, $13 million of loans were restructured and $306 thousand of loans designated as TDRs were charged off. During the three months ended March 31, 2020, $28 million of loans were restructured and $2.0 million of loans designated as TDRs were charged off.

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, as modified for short-term payment deferral forbearance.

A summary of loans currently performing and past due as of March 31, 2021 is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Energy$3,183,861 $— $— $18,627 $3,202,488 $— 
Healthcare3,287,571 — — 3,187 3,290,758 — 
Services3,404,154 1,791 208 15,795 3,421,948 — 
General business2,722,467 7,712 1,843 10,568 2,742,590 145 
Total commercial12,598,053 9,503 2,051 48,177 12,657,784 145 
Commercial real estate4,482,750 134 — 20,463 4,503,347 — 
Paycheck protection program1,848,550 — — — 1,848,550 — 
Loans to individuals:    
Residential mortgage1,782,825 7,215 415 7,023 1,797,478 250 
Residential mortgage guaranteed by U.S. government agencies
274,265 50,175 13,059 82,552 420,051 77,009 
Personal1,306,435 90 40 72 1,306,637 — 
Total loans to individuals3,363,525 57,480 13,514 89,647 3,524,166 77,259 
Total$22,292,878 $67,117 $15,565 $158,287 $22,533,847 $77,404 
A summary of loans currently performing and past due as of December 31, 2020 is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Energy$3,410,995 $12,735 $4,050 $41,414 $3,469,194 $— 
Healthcare3,302,345 — — 3,645 3,305,990 — 
Services3,489,423 3,278 177 15,705 3,508,583 326 
General business2,776,038 1,206 6,277 10,247 2,793,768 4,495 
Total commercial12,978,801 17,219 10,504 71,011 13,077,535 4,821 
Commercial real estate4,672,279 276 5,310 20,673 4,698,538 5,126 
Paycheck protection program1,682,310 — — — 1,682,310 — 
Loans to individuals:    
Residential mortgage1,849,304 5,812 837 7,050 1,863,003 181 
Residential mortgage guaranteed by U.S. government agencies
262,102 41,389 22,041 83,155 408,687 78,349 
Personal1,273,702 3,317 90 338 1,277,447 241 
Total loans to individuals3,385,108 50,518 22,968 90,543 3,549,137 78,771 
Total$22,718,498 $68,013 $38,782 $182,227 $23,007,520 $88,718 
v3.21.1
Mortgage Banking Activities
 3 Months Ended
Mar. 31, 2021
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):
 March 31, 2021December 31, 2020
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$260,005 $262,333 $227,161 $236,444 
Residential mortgage loan commitments387,465 11,455 380,637 20,435 
Forward sales contracts584,743 10,659 549,414 (4,563)
  $284,447  $252,316 

No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of March 31, 2021 or December 31, 2020. No credit losses were recognized on residential mortgage loans held for sale for the three month period ended March 31, 2021 and 2020.

Mortgage banking revenue was as follows (in thousands):
 Three Months Ended March 31,
 20212020
Production revenue:  
Net realized gains on sale of mortgage loans$26,000 $9,717 
Net change in unrealized gain (loss) on mortgage loans held for sale(6,955)3,561 
Net change in the fair value of mortgage loan commitments(8,980)19,017 
Net change in the fair value of forward sales contracts15,222 (10,725)
Total production revenue25,287 21,570 
Servicing revenue11,826 15,597 
Total mortgage banking revenue$37,113 $37,167 

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):
 March 31, 2021December 31, 2020
Number of residential mortgage loans serviced for others101,912 106,201 
Outstanding principal balance of residential mortgage loans serviced for others$15,458,772 $16,228,449 
Weighted average interest rate3.78 %3.84 %
Remaining term (in months)279280

The following represents activity in capitalized mortgage servicing rights (in thousands):
Three Months Ended March 31,
20212020
Beginning Balance$101,172 $201,886 
Additions9,830 5,441 
Change in fair value due to principal payments(11,961)(8,019)
Change in fair value due to market assumption changes33,874 (88,480)
Ending Balance$132,915 $110,828 

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:
 March 31, 2021December 31, 2020
Discount rate – risk-free rate plus a market premium9.13%9.14%
Prepayment rate - based upon loan interest rate, original term and loan type
6.37% - 17.80%
9.41% - 21.87%
Loan servicing costs – annually per loan based upon loan type:
Performing loans
$69 - $94
$69 - $94
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
1.04%0.43%
Primary/secondary mortgage rate spread
105 bps105 bps
Delinquency rate
2.77%3.54%

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.
v3.21.1
Commitments and Contingent Liabilities
 3 Months Ended
Mar. 31, 2021
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 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 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 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 remains stayed with no current deadlines pending. 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 the plaintiff's Third Amended Petition.

On January 8, 2020, the New Jersey District Court entered judgment against the principal individual and his wife for $36,805,051 in principal amount and $10,937,831 in pre-judgment interest. On January 17, 2020, the New Jersey Federal District Court formally terminated the Payment Plan. Management is no longer able to conclude that the individual principal and his wife will be successful in paying the obligations they have to pay the bonds in full but such obligations remain and are not dischargeable in bankruptcy. Beginning September 2020, the SEC filed multiple garnishments on entities either related to or holding assets for the debtor. 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. 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 remaining collateral securing payment of the bonds, approximately $20 million will remain outstanding. 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 a Wrongful Death Judgment Creditor of 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 this conduct prevented her from collecting on her judgment. On April 19, 2019, the Court granted BOKF, NA's Motion to Dismiss. On May 3, 2019, the plaintiff filed a Motion for Reconsideration which remains pending. BOKF, NA is advised by counsel that BOKF, NA has valid defenses to the plaintiffs’ claims and no loss is probable.

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. The District Court dismissed the plaintiff's action. The plaintiff has appealed to the United States Court of Appeals for the Tenth Circuit. 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 March 7, 2020, three former employees sued BOKF, NA, the Plan Committee of the BOKF, NA 401k Plan, and Cavanal Hill Investment Management, Inc., a subsidiary of BOKF, NA, alleging that the Defendants included proprietary investment products as investment options in the BOKF, NA 401k Plan, whose fees were too high and performance too low, for the purpose of earning fees. The action is brought as a putative class action on behalf of all Plan Participants. The action is pending on the defendants' motion to dismiss. Management is advised by counsel that a loss is not probable and that the loss, if any, cannot be reasonably estimated.

In 2019, a limited liability partnership sued BOKF, NA in Colorado District Court alleging that the Bank breached various fiduciary duties acting in its capacity as trustee of a trust that was a co-general partner of the partnership, claiming in excess of $60 million in damages. From 2000 to 2009, BOKF was serving as personal representative of the estate of the creator of the trust. In 2009, BOKF moved to close the probate of the estate in the Colorado Probate Court. The members of the partnership who now sue BOKF objected to the closing of the estate, making the same allegations in 2009 in probate as they now make in 2019 in the Colorado District Court. In 2009, the Colorado Probate Court entered summary judgment against the beneficiaries and the estate was closed. In the current action, the Colorado District Court has now denied BOKF’s motions for summary judgment and the matter will proceed to trial. 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 a private equity fund 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 March 31, 2021, the Company has $319 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 $104 million of unfunded commitments included in Other liabilities on the Consolidated Balance Sheets.
v3.21.1
Shareholders' Equity
 3 Months Ended
Mar. 31, 2021
Stockholders' Equity Note [Abstract]  
Shareholders' Equity [Text Block] Shareholders' Equity
On May 4, 2021, the Company declared a quarterly cash dividend of $0.52 per common share payable on or about May 27, 2021 to shareholders of record as of May 17, 2021.

Dividends declared were $0.52 per share during the three months ended March 31, 2021 and $0.51 per share during the three months ended March 31, 2020.

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 SecuritiesEmployee Benefit PlansTotal
Balance, Dec. 31, 2019$104,996 $(73)$104,923 
Net change in unrealized gain (loss)
297,843 — 297,843 
Reclassification adjustments included in earnings:
Gain on available for sale securities, net
(3)— (3)
Other comprehensive income, before income taxes
297,840 — 297,840 
Federal and state income taxes71,471 — 71,471 
Other comprehensive income, net of income taxes226,369 — 226,369 
Balance, March 31, 2020$331,365 $(73)$331,292 
Balance, Dec. 31, 2020$335,032 $836 $335,868 
Net change in unrealized gain (loss)
(150,131)— (150,131)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net
(467)— (467)
Other comprehensive income, before income taxes
(150,598)— (150,598)
Federal and state income taxes(36,139)— (36,139)
Other comprehensive income (loss), net of income taxes(114,459)— (114,459)
Balance, March 31, 2021$220,573 $836 $221,409 
v3.21.1
Earnings Per Share
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block] Earnings Per Share
 
(In thousands, except share and per share amounts)Three Months Ended March 31,
 20212020
Numerator:  
Net income attributable to BOK Financial Corp. shareholders$146,060 $62,079 
Less: Earnings allocated to participating securities937 343 
Numerator for basic earnings per share – income available to common shareholders
145,123 61,736 
Effect of reallocating undistributed earnings of participating securities— — 
Numerator for diluted earnings per share – income available to common shareholders
$145,123 $61,736 
Denominator:  
Weighted average shares outstanding69,583,788 70,513,807 
Less:  Participating securities included in weighted average shares outstanding
446,413 390,122 
Denominator for basic earnings per common share69,137,375 70,123,685 
Dilutive effect of employee stock compensation plans4,335 6,481 
Denominator for diluted earnings per common share69,141,710 70,130,166 
Basic earnings per share$2.10 $0.88 
Diluted earnings per share$2.10 $0.88 
v3.21.1
Reportable Segments
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Reportable Segments [Text Block] Reportable Segments
Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2021 is as follows (in thousands):
 CommercialConsumerWealth
Management		Funds Management and OtherBOK
Financial
Consolidated
Net interest revenue from external sources
$155,799 $16,686 $48,554 $59,381 $280,420 
Net interest revenue (expense) from internal sources
(25,794)4,288 (200)21,706 — 
Net interest revenue130,005 20,974 48,354 81,087 280,420 
Provision for credit losses
13,985 1,136 (29)(40,092)(25,000)
Net interest revenue after provision for credit losses
116,020 19,838 48,383 121,179 305,420 
Other operating revenue46,579 52,282 66,123 (1,087)163,897 
Other operating expense66,979 55,743 78,565 81,340 282,627 
Net direct contribution95,620 16,377 35,941 38,752 186,690 
Gain (loss) on financial instruments, net33 (29,616)— 29,583 — 
Change in fair value of mortgage servicing rights— 33,874 — (33,874)— 
Gain (loss) on repossessed assets, net12,737 41 — (12,778)— 
Corporate expense allocations12,734 11,487 9,887 (34,108)— 
Net income before taxes95,656 9,189 26,054 55,791 186,690 
Federal and state income taxes25,983 2,340 6,672 7,387 42,382 
Net income
69,673 6,849 19,382 48,404 144,308 
Net income (loss) attributable to non-controlling interests— — — (1,752)(1,752)
Net income attributable to BOK Financial Corp. shareholders
$69,673 $6,849 $19,382 $50,156 $146,060 
Average assets$28,047,052 $9,755,539 $18,645,865 $(6,137,823)$50,310,633 
Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2020 is as follows (in thousands):
 CommercialConsumerWealth
Management		Funds Management and OtherBOK
Financial
Consolidated
Net interest revenue from external sources$201,902 $25,876 $14,366 $19,216 $261,360 
Net interest revenue (expense) from internal sources(50,495)18,056 4,538 27,901 — 
Net interest revenue151,407 43,932 18,904 47,117 261,360 
Provision for credit losses
16,880 1,256 (48)75,683 93,771 
Net interest revenue after provision for credit losses
134,527 42,676 18,952 (28,566)167,589 
Other operating revenue38,220 55,062 97,881 (10,844)180,319 
Other operating expense60,752 53,844 78,192 75,836 268,624 
Net direct contribution111,995 43,894 38,641 (115,246)79,284 
Gain (loss) on financial instruments, net49 86,764 7 (86,820)— 
Change in fair value of mortgage servicing rights— (88,480)— 88,480 — 
Gain (loss) on repossessed assets, net9 13 — (22)— 
Corporate expense allocations8,905 10,389 8,265 (27,559)— 
Net income before taxes103,148 31,802 30,383 (86,049)79,284 
Federal and state income taxes28,173 8,101 7,810 (26,784)17,300 
Net income
74,975 23,701 22,573 (59,265)61,984 
Net income (loss) attributable to non-controlling interests— — — (95)(95)
Net income attributable to BOK Financial Corp. shareholders$74,975 $23,701 $22,573 $(59,170)$62,079 
Average assets$24,687,976 $9,850,853 $12,723,412 $(1,541,623)$45,720,618 
v3.21.1
Fees and Commissions Revenue Fees and Commissions Revenue
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021.
CommercialConsumerWealth ManagementFunds Management & OtherConsolidated
Out of Scope1
In Scope2
Trading revenue$— $— $3,716 $— $3,716 $3,716 $— 
Customer hedging revenue
4,207 — 91 (1,706)2,592 2,592 — 
Retail brokerage revenue
— — 4,741 — 4,741 — 4,741 
Insurance brokerage revenue
— — 2,916 — 2,916 — 2,916 
Investment banking revenue
2,258 — 4,768 (209)6,817 2,049 4,768 
Brokerage and trading revenue
6,465 — 16,232 (1,915)20,782 8,357 12,425 
TransFund EFT network revenue18,443 834 (13)2 19,266 — 19,266 
Merchant services revenue2,266 16 — (1)2,281 — 2,281 
Corporate card revenue804 — 28 51 883 — 883 
Transaction card revenue21,513 850 15 52 22,430 — 22,430 
Personal trust revenue— — 21,977 — 21,977 — 21,977 
Corporate trust revenue— — 3,789 — 3,789 — 3,789 
Institutional trust & retirement plan services revenue
— — 12,610 — 12,610 — 12,610 
Investment management services and other revenue
— — 2,903 43 2,946 — 2,946 
Fiduciary and asset management revenue
— — 41,279 43 41,322 — 41,322 
Commercial account service charge revenue
11,988 434 581 1 13,004 — 13,004 
Overdraft fee revenue26 4,635 19 — 4,680 — 4,680 
Check card revenue
— 5,327 — — 5,327 — 5,327 
Automated service charge and other deposit fee revenue
26 1,150 23 (1)1,198 — 1,198 
Deposit service charges and fees
12,040 11,546 623 — 24,209 — 24,209 
Mortgage production revenue— 25,287 — — 25,287 25,287 — 
Mortgage servicing revenue— 12,277 — (451)11,826 11,826 — 
Mortgage banking revenue— 37,564 — (451)37,113 37,113 — 
Other revenue9,829 2,340 7,535 (3,408)16,296 13,143 3,153 
Total fees and commissions revenue
$49,847 $52,300 $65,684 $(5,679)$162,152 $58,613 $103,539 
1     Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2    In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2020.
CommercialConsumerWealth ManagementFunds Management & OtherConsolidated
Out of Scope1
In Scope2
Trading revenue$— $— $34,384 $— $34,384 $34,384 $— 
Customer hedging revenue
2,525 — 135 563 3,223 3,223 — 
Retail brokerage revenue
— — 4,343 — 4,343 — 4,343 
Insurance brokerage revenue
— — 3,789 — 3,789 — 3,789 
Investment banking revenue
1,880 — 3,160 — 5,040 1,828 3,212 
Brokerage and trading revenue
4,405 — 45,811 563 50,779 39,435 11,344 
TransFund EFT network revenue18,212 831 (19)2 19,026 — 19,026 
Merchant services revenue2,305 14 — — 2,319 — 2,319 
Corporate card revenue520 — 16 — 536 — 536 
Transaction card revenue21,037 845 (3)2 21,881 — 21,881 
Personal trust revenue— — 20,649 — 20,649 — 20,649 
Corporate trust revenue— — 6,362 — 6,362 — 6,362 
Institutional trust & retirement plan services revenue
— — 11,896 — 11,896 — 11,896 
Investment management services and other revenue
— — 5,592 (41)5,551 — 5,551 
Fiduciary and asset management revenue
— — 44,499 (41)44,458 — 44,458 
Commercial account service charge revenue
11,039 410 545 (1)11,993 — 11,993 
Overdraft fee revenue49 7,205 22 2 7,278 — 7,278 
Check card revenue
— 5,229 — — 5,229 — 5,229 
Automated service charge and other deposit fee revenue
229 1,386 13 2 1,630 — 1,630 
Deposit service charges and fees
11,317 14,230 580 3 26,130 — 26,130 
Mortgage production revenue— 21,569 — — 21,569 21,569 — 
Mortgage servicing revenue— 16,042 — (444)15,598 15,598 — 
Mortgage banking revenue— 37,611 — (444)37,167 37,167 — 
Other revenue4,700 2,376 6,994 (1,761)12,309 8,408 3,901 
Total fees and commissions revenue
$41,459 $55,062 $97,881 $(1,678)$192,724 $85,010 $107,714 
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.
v3.21.1
Fair Value Measurements
 3 Months Ended
Mar. 31, 2021
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 months ended March 31, 2021 and 2020, respectively. Transfers between significant other observable inputs and significant unobservable inputs during the three months ended March 31, 2021 and 2020 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 March 31, 2021 or December 31, 2020.
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 March 31, 2021 (in thousands):
 TotalQuoted 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 securities$33,613 $2,070 $31,543 $— 
Residential agency mortgage-backed securities5,003,163 — 5,003,163 — 
Municipal securities27,047 — 27,047 — 
Other trading securities22,126 — 22,126 — 
Total trading securities5,085,949 2,070 5,083,879 — 
Available for sale securities:    
U.S. Treasury506 506 — — 
Municipal securities245,657 — 245,657 — 
Residential agency mortgage-backed securities9,705,314 — 9,705,314 — 
Residential non-agency mortgage-backed securities31,382 — 31,382 — 
Commercial agency mortgage-backed securities
3,426,727 — 3,426,727 — 
Other debt securities471 — — 471 
Total available for sale securities13,410,057 506 13,409,080 471 
Fair value option securities – Residential agency mortgage-backed securities72,498 — 72,498 — 
Residential mortgage loans held for sale1
284,447 — 279,151 5,296 
Mortgage servicing rights2
132,915 — — 132,915 
Derivative contracts, net of cash collateral3
1,289,156 2,772 1,286,384 — 
Liabilities: 
Derivative contracts, net of cash collateral3
719,556 2,721 716,835 — 
1Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.55% of the unpaid principal balance.
2A 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 5, Mortgage Banking Activities.
3See 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 interest rate and agricultural derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate and energy derivative contracts, net of cash margin.
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2020 (in thousands):
 TotalQuoted 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 securities$9,183 $4,999 $4,184 $— 
Residential agency mortgage-backed securities4,669,148 — 4,669,148 — 
Municipal securities19,172 — 19,172 — 
Other trading securities10,472 — 10,472 — 
Total trading securities4,707,975 4,999 4,702,976 — 
Available for sale securities:    
U.S. Treasury508 508 — — 
Municipal securities167,979 — 167,979 — 
Residential agency mortgage-backed securities9,340,471 — 9,340,471 — 
Residential non-agency mortgage-backed securities32,770 — 32,770 — 
Commercial agency mortgage-backed securities
3,508,465 — 3,508,465 — 
Other debt securities472 — — 472 
Total available for sale securities13,050,665 508 13,049,685 472 
Fair value option securities — Residential agency mortgage-backed securities114,982 — 114,982 — 
Residential mortgage loans held for sale1
252,316 — 245,299 7,017 
Mortgage servicing rights2
101,172 — — 101,172 
Derivative contracts, net of cash collateral3
810,688 10,780 799,908 — 
Liabilities:
Derivative contracts, net of cash collateral3
405,779 — 405,779 — 
1Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance.
2A 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 5, Mortgage Banking Activities.
3See 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 contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural 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.
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 nonaccruing 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 March 31, 2021 for which the fair value was adjusted during the three months ended March 31, 2021:
Fair Value Adjustments for the
 Carrying Value at March 31, 2021Three Months Ended
Mar. 31, 2021 Recognized in:
 Quoted Prices
in Active Markets for Identical Instruments		Significant
Other
Observable
Inputs		Significant
Unobservable
Inputs		Gross charge-offs against allowance for loan lossesNet losses (gains) and operating expenses of repossessed assets
Nonaccruing loans$— $259 $34,046 $15,049 $— 
Real estate and other repossessed assets
— 1,706 300 — 2,200 
 
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 March 31, 2020 for which the fair value was adjusted during the three months ended March 31, 2020:
Fair Value Adjustments for the
 Carrying Value at March 31, 2020Three Months Ended
Mar. 31, 2020 Recognized in:
 Quoted Prices
in Active Markets for Identical Instruments		Significant
Other
Observable
Inputs		Significant
Unobservable
Inputs		Gross charge-offs against allowance for loan lossesNet losses (gains) and operating expenses of repossessed assets
Nonaccruing loans$— $293 $22,746 $15,789 $— 
Real estate and other repossessed assets
— 1,066 400 — 226 

The fair value of collateral-dependent nonaccruing 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 nonaccruing 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 March 31, 2021 follows (in thousands):

Fair ValueValuation Technique(s)Unobservable InputRange
(Weighted Average)
Nonaccruing loans$34,046 Discounted cash flowsManagement 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
10% - 91% (47%)1
Real estate and other repossessed assets300 Discounted cash flowsManagement knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costsN/A
1 Represents fair value as a percentage of the unpaid principal balance.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2020 follows (in thousands):

Fair ValueValuation Technique(s)Unobservable InputRange
(Weighted Average)
Nonaccruing loans$22,746 Discounted cash flowsManagement 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
6% - 71% (36%)1
Real estate and other repossessed assets400 Appraised value, as adjusted
Marketability adjustments off appraised value2
87% - 87% (87%)
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.
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 March 31, 2021 (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$723,983 $723,983 $723,983 $— $— 
Interest-bearing cash and cash equivalents695,213 695,213 695,213 — — 
Trading securities:
U.S. government securities33,613 33,613 2,070 31,543 — 
Residential agency mortgage-backed securities5,003,163 5,003,163 — 5,003,163 — 
Municipal securities27,047 27,047 — 27,047 — 
Other trading securities22,126 22,126 — 22,126 — 
Total trading securities5,085,949 5,085,949 2,070 5,083,879 — 
Investment securities:  
Municipal securities216,047 241,278 — 67,510 173,768 
Residential agency mortgage-backed securities8,477 9,216 — 9,216 — 
Other debt securities2,214 2,213 — 2,213 — 
Total investment securities226,738 252,707 — 78,939 173,768 
Allowance for credit losses(617)— — — — 
Investment securities, net of allowance226,121 252,707 — 78,939 173,768 
Available for sale securities:  
U.S. Treasury506 506 506 — — 
Municipal securities245,657 245,657 — 245,657 — 
Residential agency mortgage-backed securities9,705,314 9,705,314 — 9,705,314 — 
Residential non-agency mortgage-backed securities31,382 31,382 — 31,382 — 
Commercial agency mortgage-backed securities
3,426,727 3,426,727 — 3,426,727 — 
Other debt securities471 471 — — 471 
Total available for sale securities13,410,057 13,410,057 506 13,409,080 471 
Fair value option securities – Residential agency mortgage-backed securities72,498 72,498 — 72,498 — 
Residential mortgage loans held for sale284,447 284,447 — 279,151 5,296 
Loans:  
Commercial12,657,784 12,546,069 — — 12,546,069 
Commercial real estate4,503,347 4,435,740 — — 4,435,740 
Paycheck protection program1,848,550 1,820,749 — — 1,820,749 
Loans to individuals3,524,166 3,528,950 — — 3,528,950 
Total loans22,533,847 22,331,508 — — 22,331,508 
Allowance for loan losses(352,402)— — — — 
Loans, net of allowance22,181,445 22,331,508 — — 22,331,508 
Mortgage servicing rights132,915 132,915 — — 132,915 
Derivative instruments with positive fair value, net of cash collateral
1,289,156 1,289,156 2,772 1,286,384 — 
Deposits with no stated maturity35,848,270 35,848,270 — — 35,848,270 
Time deposits2,004,356 2,008,294 — — 2,008,294 
Other borrowed funds2,503,678 2,500,771 — — 2,500,771 
Subordinated debentures276,024 288,109 — 288,109 — 
Derivative instruments with negative fair value, net of cash collateral
719,556 719,556 2,721 716,835 — 
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, 2020 (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$798,757 $798,757 $798,757 $— $— 
Interest-bearing cash and cash equivalents381,816 381,816 381,816 — — 
Trading securities:
U.S. government securities9,183 9,183 4,999 4,184 — 
Residential agency mortgage-backed securities4,669,148 4,669,148 — 4,669,148 — 
Municipal securities19,172 19,172 — 19,172 — 
Other trading securities10,472 10,472 — 10,472 — 
Total trading securities4,707,975 4,707,975 4,999 4,702,976 — 
Investment securities:  
Municipal securities229,245 255,270 — 69,404 185,866 
Residential agency mortgage-backed securities8,913 9,790 — 9,790 — 
Other debt securities7,373 7,371 — 7,371 — 
Total investment securities245,531 272,431 — 86,565 185,866 
Allowance for credit losses(688)0— 00
Investment securities, net of allowance244,843 272,431 — 86,565 185,866 
Available for sale securities:  
U.S. Treasury508 508 508 — — 
Municipal securities167,979 167,979 — 167,979 — 
Residential agency mortgage-backed securities9,340,471 9,340,471 — 9,340,471 — 
Residential non-agency mortgage-backed securities32,770 32,770 — 32,770 — 
Commercial agency mortgage-backed securities
3,508,465 3,508,465 — 3,508,465 — 
Other debt securities472 472 — — 472 
Total available for sale securities13,050,665 13,050,665 508 13,049,685 472 
Fair value option securities — Residential agency mortgage-backed securities114,982 114,982 — 114,982 — 
Residential mortgage loans held for sale252,316 252,316 — 245,299 7,017 
Loans:  
Commercial13,077,535 13,003,383 — — 13,003,383 
Commercial real estate4,698,538 4,649,763 — — 4,649,763 
Paycheck protection program1,682,310 1,669,461 — — 1,669,461 
Loans to individuals3,549,137 3,563,199 — — 3,563,199 
Total loans23,007,520 22,885,806 — — 22,885,806 
Allowance for loan losses(388,640)— — — — 
Loans, net of allowance22,618,880 22,885,806 — — 22,885,806 
Mortgage servicing rights101,172 101,172 — — 101,172 
Derivative instruments with positive fair value, net of cash collateral
810,688 810,688 10,780 799,908 — 
Deposits with no stated maturity34,176,752 34,176,752 — — 34,176,752 
Time deposits1,967,128 1,976,936 — — 1,976,936 
Other borrowed funds3,545,356 3,542,489 — — 3,542,489 
Subordinated debentures276,005 269,544 — 269,544 — 
Derivative instruments with negative fair value, net of cash collateral
405,779 405,779 — 405,779 — 

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.
v3.21.1
Subsequent Events
 3 Months Ended
Mar. 31, 2021
Subsequent Events [Abstract]  
Subsequent Events [Text Block] Subsequent Events The Company evaluated events from the date of the consolidated financial statements on March 31, 2021 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.
v3.21.1
Significant Accounting Policies (Policies)
 3 Months Ended
Mar. 31, 2021
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. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting ("ASU 2020-04")

On March 12, 2020, the FASB issued ASU 2020-04 which provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships that reference LIBOR or another reference rate expected to be discontinued, subject to meeting certain criteria. Under the new guidance, an entity can elect by accounting topic or industry subtopic to account for the modification of a contract affected by reference rate reform as a continuation of the existing contract, if certain conditions are met. In addition, the new guidance allows an entity to elect on a hedge-by-hedge basis to continue to apply hedge accounting for hedging relationships in which the critical terms change due to reference rate reform, if certain conditions are met. A one-time election to sell and/or transfer held-to-maturity debt securities that reference a rate affected by reference rate reform is also allowed. ASU 2020-04 became effective for all entities as of March 12, 2020 and will apply to all LIBOR reference rate modifications through December 31, 2022. Management is currently evaluating the impact of ASU 2020-04 on the Company's financial statements.

FASB Accounting Standards Update No. 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01")

On January 7, 2021, the FASB issued ASU 2021-01 which clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The amendments in this update are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. The amendments also optionally apply to all entities that designate receive-variable rate, pay-variable-rate cross-currency interest rate swaps as hedging instruments in net investment hedges that are modified as a result of reference rate reform. ASU 2021-01 is effective immediately for all entities and amendments may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020. Management is currently evaluating the impact of ASU 2021-01 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 enable them to manage their market risk 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. 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 5, 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 5 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. Accrued but not paid interest receivable is included in Receivables in the Consolidated Balance Sheets. 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.

For loans acquired with no evidence of credit deterioration, discounts are accreted on either an individual basis for loans with unique characteristics or on a pool basis for groups of homogeneous loans. Accretion is discontinued when a loan with an individually attributed discount is placed on nonaccruing status.

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. Payment deferrals up to six months are generally considered to be short-term modifications. 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 Consolidated 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. Internally risk graded loans are evaluated quarterly 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 to be impaired because we do not expect to receive all principal and interest based on the loan's contractual terms. A portion of the principal balance continues to be guaranteed; 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 and Accrual for Off-balance Sheet Credit Risk from Unfunded Loans Commitments

The allowance for loan losses and accrual for off-balance sheet credit risk from unfunded loan commitments represent the portion of the amortized cost basis of loans that we do not expect to collect over the asset’s contractual life, considering past events, current conditions, and reasonable and supportable forecasts of future economic conditions. The appropriateness of the allowance for credit losses, including industry and product adjustments, is assessed quarterly by a senior management Allowance Committee. This review is based on an on-going evaluation of the estimated expected credit losses in the portfolio and on unused commitments to provide financing. A well-documented methodology has been developed and is applied by an independent Credit Administration department to assure consistency across the Company.
The allowance for loan losses consists of specific allowances attributed to certain individual loans, generally nonaccruing loans, with dissimilar risk characteristics that have not yet been charged down to amounts we expect to recover and general allowances for estimated credit losses on pools of loans that share similar risk characteristics.

When full collection of principal or interest is uncertain, the loan’s risk characteristics have changed, and we exclude the loan from the general allowance pool, typically designating it as nonaccruing. For these loans, a specific allowance reflects the expected credit loss.

We measure specific allowances for loans excluded from the general allowance pool by an evaluation of estimated future cash flows discounted at the loan's initial effective interest rate or the fair value of collateral for certain collateral dependent loans. For a non-collateral dependent loan, the specific allowance is the amount by which the loan’s amortized cost basis exceeds its net realizable value. We measure the specific allowance for collateral dependent loans as the amount by which the loan’s amortized cost basis exceeds its fair value. When repayment is expected to be provided substantially through the sale of collateral, we deduct estimated selling costs from the collateral’s fair value. Generally, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice serve as the basis for the fair value of real property held as collateral. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. For energy loans, our internal staff of engineers generally determines collateral value of mineral rights based on projected cash flows from proven oil and gas reserves under existing economic and operating conditions. For real property held as collateral for other loans, third party appraisals that conform to Uniform Standards of Professional Appraisal Practice generally serve as the basis for the fair value. These appraised values are on an “as-is” basis and generally are not adjusted by the Company. We obtain updated appraisals at least annually or more frequently if market conditions indicate collateral values may have declined. Our special assets staff generally determines the value of other collateral based on projected liquidation cash flows under current market conditions. We evaluate collateral values and available cash resources quarterly. Historical statistics may be used to estimate specific allowances in limited situations, such as when a collateral dependent loan is removed from the general allowance pool near the end of a reporting period until an appraisal of collateral value is received or a full assessment of future cash flows is completed.

General allowances estimate expected credit losses on pools of loans sharing similar risk characteristics that are expected to occur over the loan’s estimated remaining life. The loan’s estimated remaining life represents the contractual term adjusted for amortization, estimates of prepayments, and borrower-owned extension options. Approximately 90 percent of the committed dollars in the loan portfolio is risk graded loans with general allowance model inputs that include probability of default, loss given default, and exposure at default. Probability of default is based on the migration of loans from performing to nonperforming using historical life of loan analysis periods. Loss given default is based on the aggregate losses incurred, net of estimated recoveries. Exposure at default represents an estimate of the outstanding amount of credit exposure at the time a default may occur.

Charge-off migration is used to calculate the general allowance for the majority of non-risk graded loans to individuals. The expected credit loss on less than 10 percent of the committed dollars in the portfolio is calculated using charge-off migration.

The expected credit loss on approximately 1 percent of the committed dollars in the portfolio is calculated using a non-modeled approach. Specifically, the calculation applies a long-term net charge-off rate to the loan balances, adjusted for the weighted average remaining maturity of each portfolio.
    
In estimating the expected credit losses for general allowances on performing risk-graded loans, each portfolio class is assigned relevant economic loss drivers which best explain variations in portfolio net loss rates. The probability of default estimates for each portfolio class are adjusted for current and forecasted economic conditions. The result is applied to the exposure at default and loss given default to calculate the lifetime expected credit loss estimate. Selection of relevant economic loss drivers is re-evaluated periodically and involves statistical analysis as well as management judgment. The unemployment rate factors significantly in the allowance for loan losses calculation, affecting commercial and loans to individuals segments. Other primary factors impacting the commercial portfolio include BBB corporate spreads, real gross domestic product growth rate, and energy commodity prices. The primary commercial real estate variables are vacancy rate and BBB corporate spreads. In addition to the unemployment rate, the forecast for loans to individuals is tied to home price index. The forecasts may include regional economic factors when localized conditions diverge from national conditions.
An Economic Forecast Committee, consisting of senior management with members largely independent of the allowance process develops a twelve-month forward-looking forecast for the relevant economic loss drivers. Management develops these forecasts based on external data as well as a view of future economic conditions, which may include adjustments for regional conditions. The forecast includes three economic scenarios and probability weights for each scenario. The base forecast represents management's view of the most likely outcome, while the downside forecast reflects reasonably possible worsening economic conditions, and the upside forecast projects reasonably possible improving conditions.

At the end of the one-year reasonable and supportable forecast period, we transition from shorter-term expected losses to long-term loss averages for the loan’s estimated remaining life. The difference between short-term loss forecasts and long-term loss averages is run-off over the reversion horizon, up to three years, depending on the forecasted economic scenarios.

General allowances also consider the estimated impact of factors that are not captured in the modeled results or historical experience. These factors may increase or decrease modeled results by amounts determined by the Allowance Committee. Factors not captured in modeled results or historical experience may include for example, new lines of business, market conditions that have not been previously encountered, observed changes in credit risk that are not yet reflected in macro-economic factors, or economic conditions that impact loss given default assumptions.

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 that are not unconditionally cancelable by the bank. This accrual is included in other liabilities in the Consolidated Balance Sheets. The appropriateness of the accrual is determined in the same manner as the allowance for loan losses, with the added consideration of commitment usage over the remaining life for those loans that the bank can not unconditionally cancel.
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.
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.
v3.21.1
Derivative Instruments and Hedging Activities (Policies)
 3 Months Ended
Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
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 enable them to manage their market risk 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. 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 5, 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 5 for additional discussion of notional, fair value and impact on earnings of these contracts.
v3.21.1
Securities (Tables)
 3 Months Ended
Mar. 31, 2021
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):
 
 March 31, 2021December 31, 2020
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
U.S. government securities$33,613 $(239)$9,183 $— 
Residential agency mortgage-backed securities
5,003,163 (10,647)4,669,148 (3,624)
Municipal securities27,047 (49)19,172 42 
Other debt securities22,126 (30)10,472 22 
Total trading securities$5,085,949 $(10,965)$4,707,975 $(3,560)
Investment Securities (Held-to-Maturity) [Table Text Block]
The amortized cost and fair values of investment securities are as follows (in thousands):
 March 31, 2021
 AmortizedFairGross Unrealized
 CostValueGainLoss
Municipal securities$216,047 $241,278 $25,395 $(164)
Residential agency mortgage-backed securities
8,477 9,216 739 — 
Other debt securities2,214 2,213 — (1)
Total investment securities226,738 252,707 26,134 (165)
Allowance for credit losses(617)
Investment securities, net of allowance$226,121 $252,707 $26,134 $(165)
 December 31, 2020
 AmortizedFairGross Unrealized
 CostValueGainLoss
Municipal securities$229,245 $255,270 $26,169 $(144)
Residential agency mortgage-backed securities
8,913 9,790 877 — 
Other debt securities7,373 7,371 — (2)
Total investment securities245,531 272,431 27,046 (146)
Allowance for credit losses(688)
Investment securities, net of allowance$244,843 $272,431 $27,046 $(146)
The amortized cost and fair values of investment securities at March 31, 2021, 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$27,143 $76,456 $106,311 $8,351 $218,261 4.95 
Fair value27,866 85,490 121,763 8,372 243,491  
Residential mortgage-backed securities:      
Amortized cost    $8,477 2
Fair value    9,216  
Total investment securities:      
Amortized cost    $226,738  
Fair value    252,707  
1Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
2The average expected lives of residential mortgage-backed securities were 4.4 years based upon current prepayment assumptions.

Temporarily Impaired Investment Securities
(in thousands):
March 31, 2021
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities6 $2,440 $51 $2,035 $113 $4,475 $164 
Other debt securities1 25 1 — — 25 1 
Total investment securities7 $2,465 $52 $2,035 $113 $4,500 $165 

December 31, 2020
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Investment:       
Municipal securities6 $2,451 $40 $2,043 $104 $4,494 $144 
Other debt securities2 250 1 25 1 275 2 
Total investment securities8 $2,701 $41 $2,068 $105 $4,769 $146 
Available For Sale Securities [Table Text Block]
The amortized cost and fair value of available for sale securities are as follows (in thousands):
 March 31, 2021
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$500 $506 $6 $— 
Municipal securities248,016 245,657 1,422 (3,781)
Mortgage-backed securities:    
Residential agency9,483,601 9,705,314 266,968 (45,255)
Residential non-agency15,890 31,382 15,492 — 
Commercial agency3,371,333 3,426,727 74,722 (19,328)
Other debt securities500 471 — (29)
Total available for sale securities$13,119,840 $13,410,057 $358,610 $(68,393)
 December 31, 2020
 AmortizedFairGross Unrealized
 CostValueGainLoss
U.S. Treasury$500 $508 $8 $— 
Municipal securities165,318 167,979 2,666 (5)
Mortgage-backed securities:   
Residential agency9,019,013 9,340,471 328,183 (6,725)
Residential non-agency17,563 32,770 15,207 — 
Commercial agency3,406,956 3,508,465 103,590 (2,081)
Other debt securities500 472 — (28)
Total available for sale securities$12,609,850 $13,050,665 $449,654 $(8,839)

The amortized cost and fair values of available for sale securities at March 31, 2021, 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$71,119 $1,562,072 $1,379,950 $607,208 $3,620,349 7.76 
Fair value71,223 1,610,227 1,373,270 618,641 3,673,361 
Residential mortgage-backed securities:
Amortized cost$9,499,491 2
Fair value9,736,696 
Total available-for-sale securities:
Amortized cost$13,119,840 
Fair value13,410,057 
1Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
2The average expected lives of residential mortgage-backed securities were 3.9 years based upon current prepayment assumptions.
Sales of available for sale securities resulted in gains and losses as follows (in thousands):
 Three Months Ended March 31,
 20212020
Proceeds$56,037 $26,894 
Gross realized gains473 3 
Gross realized losses(6)— 
Related federal and state income tax expense (benefit)119 1 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]
March 31, 2021
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available for sale:       
Municipal securities81 $186,267 $3,781 $— $— $186,267 $3,781 
Mortgage-backed securities:
    
Residential agency90 3,005,975 44,828 139,714 427 3,145,689 45,255 
Commercial agency60 711,113 18,623 305,406 705 1,016,519 19,328 
Other debt securities1 — — 471 29 471 29 
Total available for sale securities232 $3,903,355 $67,232 $445,591 $1,161 $4,348,946 $68,393 

December 31, 2020
 Number of SecuritiesLess Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available for sale:     
Municipal securities1 $6,166 $5 $— $— $6,166 $5 
Mortgage-backed securities:
     
Residential agency
38 786,890 6,605 160,747 120 947,637 6,725 
Commercial agency
37 350,506 1,587 277,627 494 628,133 2,081 
Other debt securities1 — — 472 28 472 28 
Total available for sale securities
77 $1,143,562 $8,197 $438,846 $642 $1,582,408 $8,839 
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):
 March 31, 2021December 31, 2020
 Fair ValueNet Unrealized Gain (Loss)Fair ValueNet Unrealized Gain (Loss)
Residential agency mortgage-backed securities
$72,498 $3,233 $114,982 $4,463 
v3.21.1
Derivatives (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021 (in thousands):
Assets
 
Notional1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,221,571 $79,353 $(9,135)$70,218 $— $70,218 
Energy contracts3,930,367 618,401 (152,837)465,564 — 465,564 
Agricultural contracts32,893 1,629 (1,513)116 — 116 
Foreign exchange contracts346,897 343,101 — 343,101 (540)342,561 
Equity option contracts65,678 1,455 — 1,455 (300)1,155 
Total customer risk management programs7,597,406 1,043,939 (163,485)880,454 (840)879,614 
Trading67,796,867 785,765 (380,313)405,452 (774)404,678 
Internal risk management programs801,025 17,301 (12,437)4,864 — 4,864 
Total derivative contracts$76,195,298 $1,847,005 $(556,235)$1,290,770 $(1,614)$1,289,156 
Liabilities
 
Notional1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,221,571 $79,619 $(9,135)$70,484 $(60,429)$10,055 
Energy contracts3,897,430 602,728 (152,837)449,891 (443,933)5,958 
Agricultural contracts32,893 1,609 (1,513)96 — 96 
Foreign exchange contracts347,166 343,134 — 343,134 (24)343,110 
Equity option contracts65,678 1,455 — 1,455 — 1,455 
Total customer risk management programs7,564,738 1,028,545 (163,485)865,060 (504,386)360,674 
Trading66,746,760 834,430 (380,313)454,117 (99,371)354,746 
Internal risk management programs1,064,473 21,036 (12,437)8,599 (4,463)4,136 
Total derivative contracts$75,375,971 $1,884,011 $(556,235)$1,327,776 $(608,220)$719,556 
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, 2020 (in thousands):
Assets
 
Notional 1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,212,469 $113,524 $(144)$113,380 $— $113,380 
Energy contracts3,791,565 386,008 (211,468)174,540 — 174,540 
Agricultural contracts14,765 3,859 — 3,859 — 3,859 
Foreign exchange contracts337,001 332,257 — 332,257 (420)331,837 
Equity option contracts70,199 1,222 — 1,222 (285)937 
Total customer risk management programs7,425,999 836,870 (211,612)625,258 (705)624,553 
Trading84,997,593 440,627 (240,655)199,972 (26,958)173,014 
Internal risk management programs995,123 17,352 (4,231)13,121 — 13,121 
Total derivative contracts$93,418,715 $1,294,849 $(456,498)$838,351 $(27,663)$810,688 
Liabilities
 
Notional 1
Gross Fair ValueNetting AdjustmentsNet Fair Value Before Cash CollateralCash CollateralFair Value Net of Cash Collateral
Customer risk management programs:   
Interest rate contracts$3,212,469 $113,900 $(144)$113,756 $(104,202)$9,554 
Energy contracts3,617,678 361,334 (211,468)149,866 (114,070)35,796 
Agricultural contracts14,781 3,844 — 3,844 (3,844)— 
Foreign exchange contracts336,223 331,035 — 331,035 (1,165)329,870 
Equity option contracts70,199 1,222 — 1,222 — 1,222 
Total customer risk management programs7,251,350 811,335 (211,612)599,723 (223,281)376,442 
Trading88,929,916 414,801 (240,655)174,146 (145,692)28,454 
Internal risk management programs145,256 5,529 (4,231)1,298 (415)883 
Total derivative contracts$96,326,522 $1,231,665 $(456,498)$775,167 $(369,388)$405,779 
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
March 31, 2021March 31, 2020
 Brokerage
and Trading Revenue		Gain (Loss) on Derivatives, NetBrokerage
and Trading
Revenue		Gain (Loss)on Derivatives, Net
Customer risk management programs:    
Interest rate contracts$1,388 $— $942 $— 
Energy contracts1,020 — 2,007 — 
Agricultural contracts18 — 15 — 
Foreign exchange contracts166 — 258 — 
Equity option contracts— — — — 
Total customer risk management programs2,592 — 3,222 — 
Trading1
(71,259)— (40,655)— 
Internal risk management programs— (27,650)— 18,420 
Total derivative contracts$(68,667)$(27,650)$(37,433)$18,420 
1    Represents changes in fair value of to-be-announced securities and other derivative instruments held to mitigate market risk of trading securities portfolio, which is offset by changes in fair value of trading securities also include in Brokerage and Trading Revenue in the Consolidated Statements of Earnings.
v3.21.1
Loans and Allowances for Credit Losses (Tables)
 3 Months Ended
Mar. 31, 2021
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):
 March 31, 2021December 31, 2020
Fixed
Rate		Variable
Rate		Non-accrualTotalFixed
Rate		Variable
Rate		Non-accrualTotal
Commercial$3,264,973 $9,245,738 $147,073 $12,657,784 $3,174,203 $9,736,173 $167,159 $13,077,535 
Commercial real estate
1,019,531 3,456,573 27,243 4,503,347 1,047,486 3,623,806 27,246 4,698,538 
Paycheck protection program1,848,550 — — 1,848,550 1,682,310 — — 1,682,310 
Loans to individuals2,146,671 1,335,792 41,703 3,524,166 2,174,874 1,333,975 40,288 3,549,137 
Total$8,279,725 $14,038,103 $216,019 $22,533,847 $8,078,873 $14,693,954 $234,693 $23,007,520 
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 is summarized as follows (in thousands):
Three Months Ended
March 31, 2021
 CommercialCommercial Real EstatePaycheck Protection ProgramLoans to IndividualsNonspecific AllowanceTotal
Allowance for loan losses:     
Beginning balance$254,934 $86,558 $— $47,148 $— $388,640 
Provision for loan losses(9,893)(4,579)— (7,298)— (21,770)
Loans charged off(15,345)(263)— (1,297)— (16,905)
Recoveries of loans previously charged off
1,676 30 — 731 — 2,437 
Ending Balance$231,372 $81,746 $— $39,284 — $352,402 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$14,422 $20,571 $— $1,928 $— $36,921 
Provision for off-balance sheet credit risk
(1,686)(2,273)— (85)— (4,044)
Ending Balance$12,736 $18,298 $— $1,843 $— $32,877 
Three Months Ended
March 31, 2020
 CommercialCommercial Real EstatePaycheck Protection ProgramLoans to IndividualsNonspecific AllowanceTotal
Allowance for loan losses:     
Beginning balance$118,187 $51,805 $— $23,572 $17,195 $210,759 
Transition adjustment33,681 (4,620)— 13,943 (17,195)25,809 
Beginning balance, adjusted151,868 47,185 — 37,515 — 236,568 
Provision for loan losses77,723 5,115 — 13,126 — 95,964 
Loans charged off(16,615)(886)— (1,416)— (18,917)
Recoveries of loans previously charged off
462 47 — 1,187 — 1,696 
Ending Balance$213,438 $51,461 $— $50,412 — $315,311 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$1,434 $107 $— $44 $— $1,585 
Transition adjustment10,144 11,660 — 1,748 — 23,552 
Beginning balance, adjusted11,578 11,767 — 1,792 — 25,137 
Provision for off-balance sheet credit risk
2,462 808 — 107 — 3,377 
Ending Balance$14,040 $12,575 $— $1,899 — $28,514 

Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the anticipated impact of the on-going COVID-19 pandemic, and other assumptions, resulted in a $31.1 million reduction in the allowance for lending activities during the first quarter of 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $5.2 million increase in the allowance for lending activities.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2021 is as follows (in thousands):
 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$12,510,711 $214,711 $147,073 $16,661 $12,657,784 $231,372 
Commercial real estate4,476,104 78,356 27,243 3,390 4,503,347 81,746 
Paycheck protection program1,848,550 — — — 1,848,550 — 
Loans to individuals3,482,463 39,284 41,703 — 3,524,166 39,284 
Total$22,317,828 $332,351 $216,019 $20,051 $22,533,847 $352,402 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2020 is as follows (in thousands):

 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$12,910,376 $235,882 $167,159 $19,052 $13,077,535 $254,934 
Commercial real estate4,671,292 83,169 27,246 3,389 4,698,538 86,558 
Paycheck protection program1,682,310 — — — 1,682,310 — 
Loans to individuals3,508,849 47,148 40,288 — 3,549,137 47,148 
Total$22,772,827 $366,199 $234,693 $22,441 $23,007,520 $388,640 
Schedule of Credit Quality Indicators [Table Text Block]
The following table summarizes the Company’s loan portfolio at March 31, 2021 by the risk grade categories and vintage (in thousands): 
Origination Year
20212020201920182017PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Energy
Pass$63,102 $81,658 $51,881 $78,812 $6,731 $8,019 $2,388,115 $— $2,678,318 
Special Mention17,000 — — — — — 144,976 — 161,976 
Accruing Substandard
— 24,051 1,319 1,337 — 11,922 221,765 — 260,394 
Nonaccrual— 21,008 2,488 — — 13,340 64,964 — 101,800 
Total energy
80,102 126,717 55,688 80,149 6,731 33,281 2,819,820 — 3,202,488 
Healthcare
Pass114,646 570,755 617,791 615,371 394,541 780,397 153,973 — 3,247,474 
Special Mention— — — — — 504 5 — 509 
Accruing Substandard
— — 27,500 1,032 — 11,056 — — 39,588 
Nonaccrual— — 18 — — 2,660 509 — 3,187 
Total healthcare114,646 570,755 645,309 616,403 394,541 794,617 154,487 — 3,290,758 
Services
Pass182,186 542,579 381,122 327,241 300,688 1,005,483 574,095 627 3,314,021 
Special Mention— 138 1,446 1,008 7 1,844 1,971 — 6,414 
Accruing Substandard
— 421 11,238 18,435 5,288 9,471 28,627 — 73,480 
Nonaccrual— 4,732 448 766 14,369 7,033 685 — 28,033 
Total services182,186 547,870 394,254 347,450 320,352 1,023,831 605,378 627 3,421,948 
General business
Pass118,267 361,002 370,674 274,644 209,218 297,857 1,032,658 2,305 2,666,625 
Special Mention— 189 4,850 3,401 7,469 1,781 4,903 — 22,593 
Accruing Substandard
— 1,392 2,575 12,901 8,738 10,287 3,408 18 39,319 
Nonaccrual— 1,675 3,887 5,893 1,430 565 558 45 14,053 
Total general business
118,267 364,258 381,986 296,839 226,855 310,490 1,041,527 2,368 2,742,590 
Total commercial
495,201 1,609,600 1,477,237 1,340,841 948,479 2,162,219 4,621,212 2,995 12,657,784 
Commercial real estate:
Pass73,306 812,635 1,215,895 796,047 430,066 951,180 163,737 37 4,442,903 
Special Mention— — — 3,201 14,110 6,900 — — 24,211 
Accruing Substandard
— — — — 4,454 4,509 27 — 8,990 
Nonaccrual— — 8,300 — — 18,943 — — 27,243 
Total commercial real estate
73,306 812,635 1,224,195 799,248 448,630 981,532 163,764 37 4,503,347 
Origination Year
20212020201920182017PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Paycheck protection program:
Pass544,128 1,304,422 — — — — — — 1,848,550 
Total paycheck protection program544,128 1,304,422 — — — — — — 1,848,550 
Loans to individuals:
Residential mortgage
Pass124,830 534,781 119,866 100,259 103,645 433,347 318,319 23,567 1,758,614 
Special Mention— 22 — 1,851 — 3,429 204 74 5,580 
Accruing Substandard
— — — — — — 400 — 400 
Nonaccrual— 626 124 1,913 728 24,658 4,013 822 32,884 
Total residential mortgage
124,830 535,429 119,990 104,023 104,373 461,434 322,936 24,463 1,797,478 
Residential mortgage guaranteed by U.S. government agencies
Pass— 7,101 32,171 35,189 45,744 291,282 — — 411,487 
Nonaccrual— — — 873 — 7,691 — — 8,564 
Total residential mortgage guaranteed by U.S. government agencies
— 7,101 32,171 36,062 45,744 298,973 — — 420,051 
Personal:
Pass44,298 215,962 192,533 73,230 97,757 155,714 524,716 1,370 1,305,580 
Special Mention— 28 14 21 2 474 12 — 551 
Accruing Substandard
— — 215 — — 17 19 — 251 
Nonaccrual— 2 11 60 73 81 28 — 255 
Total personal
44,298 215,992 192,773 73,311 97,832 156,286 524,775 1,370 1,306,637 
Total loans to individuals
169,128 758,522 344,934 213,396 247,949 916,693 847,711 25,833 3,524,166 
Total loans
$1,281,763 $4,485,179 $3,046,366 $2,353,485 $1,645,058 $4,060,444 $5,632,687 $28,865 $22,533,847 
The following table summarizes the Company’s loan portfolio at December 31, 2020 by the risk grade categories and vintage (in thousands): 
Origination Year
20202019201820172016PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Energy
Pass$112,614 $51,863 $89,346 $7,178 $1,148 $7,956 $2,548,663 $— $2,818,768 
Special Mention— — — — — — 202,590 — 202,590 
Accruing Substandard
24,000 1,363 1,453 — 12,667 — 283,294 — 322,777 
Nonaccrual21,076 2,607 — — — 21,064 80,312 — 125,059 
Total energy
157,690 55,833 90,799 7,178 13,815 29,020 3,114,859 — 3,469,194 
Healthcare
Pass536,745 615,221 638,302 422,834 234,399 658,286 147,132 — 3,252,919 
Special Mention— 27,500 — — — 8,282 5 — 35,787 
Accruing Substandard
— — 1,191 929 132 11,387 — — 13,639 
Nonaccrual— 18 183 — — 2,935 509 — 3,645 
Total healthcare536,745 642,739 639,676 423,763 234,531 680,890 147,646 — 3,305,990 
Services
Pass534,853 436,384 372,867 307,374 373,785 683,936 665,491 682 3,375,372 
Special Mention150 9,057 389 291 2,038 2,000 3,063 — 16,988 
Accruing Substandard
429 6,380 26,008 6,027 5,030 7,954 38,797 — 90,625 
Nonaccrual4,833 448 — 12,590 1,049 6,138 540 — 25,598 
Total services540,265 452,269 399,264 326,282 381,902 700,028 707,891 682 3,508,583 
General business
Pass419,756 394,985 310,273 236,222 103,987 186,600 1,055,878 2,316 2,710,017 
Special Mention197 4,519 9,713 7,803 2,511 3,159 2,483 19 30,404 
Accruing Substandard
1,432 3,069 6,694 10,935 10,042 3,729 4,449 140 40,490 
Nonaccrual1,675 3,728 4,863 1,436 530 107 477 41 12,857 
Total general business
423,060 406,301 331,543 256,396 117,070 193,595 1,063,287 2,516 2,793,768 
Total commercial
1,657,760 1,557,142 1,461,282 1,013,619 747,318 1,603,533 5,033,683 3,198 13,077,535 
Commercial real estate:
Pass725,577 1,211,338 954,226 489,193 314,899 722,475 223,131 38 4,640,877 
Special Mention— — 259 12,311 2,725 5,831 — — 21,126 
Accruing Substandard
— — — 4,410 — 4,852 27 — 9,289 
Nonaccrual— 8,300 — 232 7,468 11,246 — — 27,246 
Total commercial real estate
725,577 1,219,638 954,485 506,146 325,092 744,404 223,158 38 4,698,538 
Origination Year
20202019201820172016PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Paycheck protection program:
Pass1,682,310 — — — — — — — 1,682,310 
Total paycheck protection program1,682,310 — — — — — — — 1,682,310 
Loans to individuals:
Residential mortgage
Pass564,325 149,832 120,875 124,930 158,801 348,292 335,259 24,553 1,826,867 
Special Mention33 11 2,094 — 59 318 950 10 3,475 
Accruing Substandard
— — 51 — — 34 272 76 433 
Nonaccrual648 104 1,658 784 2,010 22,415 3,835 774 32,228 
Total residential mortgage
565,006 149,947 124,678 125,714 160,870 371,059 340,316 25,413 1,863,003 
Residential mortgage guaranteed by U.S. government agencies
Pass4,859 33,880 34,464 43,099 58,264 226,380 — — 400,946 
Nonaccrual— — 545 — 309 6,887 — — 7,741 
Total residential mortgage guaranteed by U.S. government agencies
4,859 33,880 35,009 43,099 58,573 233,267 — — 408,687 
Personal:
Pass219,873 200,580 76,246 100,229 64,104 102,126 510,571 1,510 1,275,239 
Special Mention39 55 66 — 469 31 965 — 1,625 
Accruing Substandard
11 214 10 — — — 29 — 264 
Nonaccrual28 17 57 73 50 49 45 — 319 
Total personal
219,951 200,866 76,379 100,302 64,623 102,206 511,610 1,510 1,277,447 
Total loans to individuals
789,816 384,693 236,066 269,115 284,066 706,532 851,926 26,923 3,549,137 
Total loans
$4,855,463 $3,161,473 $2,651,833 $1,788,880 $1,356,476 $3,054,469 $6,108,767 $30,159 $23,007,520 
Financing Receivable, Nonaccrual [Table Text Block]
A summary of nonaccruing loans at March 31, 2021 follows (in thousands): 
As of March 31, 2021
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Energy$101,800 $48,042 $53,758 $13,893 
Healthcare3,187 3,187 — — 
Services28,033 24,046 3,987 2,650 
General business14,053 13,935 118 118 
Total commercial147,073 89,210 57,863 16,661 
Commercial real estate27,243 13,642 13,601 3,390 
Loans to individuals:    
Residential mortgage32,884 32,884 — — 
Residential mortgage guaranteed by U.S. government agencies
8,564 8,564 — — 
Personal255 255 — — 
Total loans to individuals41,703 41,703 — — 
Total$216,019 $144,555 $71,464 $20,051 


A summary of nonaccruing loans at December 31, 2020 follows (in thousands): 
As of December 31, 2020
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Energy$125,059 $76,633 $48,426 $16,478 
Healthcare3,645 3,645 — — 
Services25,598 20,810 4,788 2,574 
General business12,857 12,857 — — 
Total commercial167,159 113,945 53,214 19,052 
Commercial real estate27,246 13,645 13,601 3,389 
Loans to individuals:    
Residential mortgage32,228 32,228 — — 
Residential mortgage guaranteed by U.S. government agencies
7,741 7,741 — — 
Personal319 319 — — 
Total loans to individuals40,288 40,288 — — 
Total$234,693 $167,878 $66,815 $22,441 
Summary of Loans by Aging Status [Table Text Block]
A summary of loans currently performing and past due as of March 31, 2021 is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Energy$3,183,861 $— $— $18,627 $3,202,488 $— 
Healthcare3,287,571 — — 3,187 3,290,758 — 
Services3,404,154 1,791 208 15,795 3,421,948 — 
General business2,722,467 7,712 1,843 10,568 2,742,590 145 
Total commercial12,598,053 9,503 2,051 48,177 12,657,784 145 
Commercial real estate4,482,750 134 — 20,463 4,503,347 — 
Paycheck protection program1,848,550 — — — 1,848,550 — 
Loans to individuals:    
Residential mortgage1,782,825 7,215 415 7,023 1,797,478 250 
Residential mortgage guaranteed by U.S. government agencies
274,265 50,175 13,059 82,552 420,051 77,009 
Personal1,306,435 90 40 72 1,306,637 — 
Total loans to individuals3,363,525 57,480 13,514 89,647 3,524,166 77,259 
Total$22,292,878 $67,117 $15,565 $158,287 $22,533,847 $77,404 
A summary of loans currently performing and past due as of December 31, 2020 is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Energy$3,410,995 $12,735 $4,050 $41,414 $3,469,194 $— 
Healthcare3,302,345 — — 3,645 3,305,990 — 
Services3,489,423 3,278 177 15,705 3,508,583 326 
General business2,776,038 1,206 6,277 10,247 2,793,768 4,495 
Total commercial12,978,801 17,219 10,504 71,011 13,077,535 4,821 
Commercial real estate4,672,279 276 5,310 20,673 4,698,538 5,126 
Paycheck protection program1,682,310 — — — 1,682,310 — 
Loans to individuals:    
Residential mortgage1,849,304 5,812 837 7,050 1,863,003 181 
Residential mortgage guaranteed by U.S. government agencies
262,102 41,389 22,041 83,155 408,687 78,349 
Personal1,273,702 3,317 90 338 1,277,447 241 
Total loans to individuals3,385,108 50,518 22,968 90,543 3,549,137 78,771 
Total$22,718,498 $68,013 $38,782 $182,227 $23,007,520 $88,718 
v3.21.1
Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2021
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 March 31, 2021December 31, 2020
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$260,005 $262,333 $227,161 $236,444 
Residential mortgage loan commitments387,465 11,455 380,637 20,435 
Forward sales contracts584,743 10,659 549,414 (4,563)
  $284,447  $252,316 
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 Three Months Ended March 31,
 20212020
Production revenue:  
Net realized gains on sale of mortgage loans$26,000 $9,717 
Net change in unrealized gain (loss) on mortgage loans held for sale(6,955)3,561 
Net change in the fair value of mortgage loan commitments(8,980)19,017 
Net change in the fair value of forward sales contracts15,222 (10,725)
Total production revenue25,287 21,570 
Servicing revenue11,826 15,597 
Total mortgage banking revenue$37,113 $37,167 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
 March 31, 2021December 31, 2020
Number of residential mortgage loans serviced for others101,912 106,201 
Outstanding principal balance of residential mortgage loans serviced for others$15,458,772 $16,228,449 
Weighted average interest rate3.78 %3.84 %
Remaining term (in months)279280
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
The following represents activity in capitalized mortgage servicing rights (in thousands):
Three Months Ended March 31,
20212020
Beginning Balance$101,172 $201,886 
Additions9,830 5,441 
Change in fair value due to principal payments(11,961)(8,019)
Change in fair value due to market assumption changes33,874 (88,480)
Ending Balance$132,915 $110,828 
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:
 March 31, 2021December 31, 2020
Discount rate – risk-free rate plus a market premium9.13%9.14%
Prepayment rate - based upon loan interest rate, original term and loan type
6.37% - 17.80%
9.41% - 21.87%
Loan servicing costs – annually per loan based upon loan type:
Performing loans
$69 - $94
$69 - $94
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
1.04%0.43%
Primary/secondary mortgage rate spread
105 bps105 bps
Delinquency rate
2.77%3.54%
v3.21.1
Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2021
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 SecuritiesEmployee Benefit PlansTotal
Balance, Dec. 31, 2019$104,996 $(73)$104,923 
Net change in unrealized gain (loss)
297,843 — 297,843 
Reclassification adjustments included in earnings:
Gain on available for sale securities, net
(3)— (3)
Other comprehensive income, before income taxes
297,840 — 297,840 
Federal and state income taxes71,471 — 71,471 
Other comprehensive income, net of income taxes226,369 — 226,369 
Balance, March 31, 2020$331,365 $(73)$331,292 
Balance, Dec. 31, 2020$335,032 $836 $335,868 
Net change in unrealized gain (loss)
(150,131)— (150,131)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net
(467)— (467)
Other comprehensive income, before income taxes
(150,598)— (150,598)
Federal and state income taxes(36,139)— (36,139)
Other comprehensive income (loss), net of income taxes(114,459)— (114,459)
Balance, March 31, 2021$220,573 $836 $221,409 
v3.21.1
Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share [Table Text Block]
(In thousands, except share and per share amounts)Three Months Ended March 31,
 20212020
Numerator:  
Net income attributable to BOK Financial Corp. shareholders$146,060 $62,079 
Less: Earnings allocated to participating securities937 343 
Numerator for basic earnings per share – income available to common shareholders
145,123 61,736 
Effect of reallocating undistributed earnings of participating securities— — 
Numerator for diluted earnings per share – income available to common shareholders
$145,123 $61,736 
Denominator:  
Weighted average shares outstanding69,583,788 70,513,807 
Less:  Participating securities included in weighted average shares outstanding
446,413 390,122 
Denominator for basic earnings per common share69,137,375 70,123,685 
Dilutive effect of employee stock compensation plans4,335 6,481 
Denominator for diluted earnings per common share69,141,710 70,130,166 
Basic earnings per share$2.10 $0.88 
Diluted earnings per share$2.10 $0.88 
v3.21.1
Reportable Segments (Tables)
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Reportable Segments [Table Text Block]
Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2021 is as follows (in thousands):
 CommercialConsumerWealth
Management		Funds Management and OtherBOK
Financial
Consolidated
Net interest revenue from external sources
$155,799 $16,686 $48,554 $59,381 $280,420 
Net interest revenue (expense) from internal sources
(25,794)4,288 (200)21,706 — 
Net interest revenue130,005 20,974 48,354 81,087 280,420 
Provision for credit losses
13,985 1,136 (29)(40,092)(25,000)
Net interest revenue after provision for credit losses
116,020 19,838 48,383 121,179 305,420 
Other operating revenue46,579 52,282 66,123 (1,087)163,897 
Other operating expense66,979 55,743 78,565 81,340 282,627 
Net direct contribution95,620 16,377 35,941 38,752 186,690 
Gain (loss) on financial instruments, net33 (29,616)— 29,583 — 
Change in fair value of mortgage servicing rights— 33,874 — (33,874)— 
Gain (loss) on repossessed assets, net12,737 41 — (12,778)— 
Corporate expense allocations12,734 11,487 9,887 (34,108)— 
Net income before taxes95,656 9,189 26,054 55,791 186,690 
Federal and state income taxes25,983 2,340 6,672 7,387 42,382 
Net income
69,673 6,849 19,382 48,404 144,308 
Net income (loss) attributable to non-controlling interests— — — (1,752)(1,752)
Net income attributable to BOK Financial Corp. shareholders
$69,673 $6,849 $19,382 $50,156 $146,060 
Average assets$28,047,052 $9,755,539 $18,645,865 $(6,137,823)$50,310,633 
Reportable segments reconciliation to the Consolidated Financial Statements for the three months ended March 31, 2020 is as follows (in thousands):
 CommercialConsumerWealth
Management		Funds Management and OtherBOK
Financial
Consolidated
Net interest revenue from external sources$201,902 $25,876 $14,366 $19,216 $261,360 
Net interest revenue (expense) from internal sources(50,495)18,056 4,538 27,901 — 
Net interest revenue151,407 43,932 18,904 47,117 261,360 
Provision for credit losses
16,880 1,256 (48)75,683 93,771 
Net interest revenue after provision for credit losses
134,527 42,676 18,952 (28,566)167,589 
Other operating revenue38,220 55,062 97,881 (10,844)180,319 
Other operating expense60,752 53,844 78,192 75,836 268,624 
Net direct contribution111,995 43,894 38,641 (115,246)79,284 
Gain (loss) on financial instruments, net49 86,764 7 (86,820)— 
Change in fair value of mortgage servicing rights— (88,480)— 88,480 — 
Gain (loss) on repossessed assets, net9 13 — (22)— 
Corporate expense allocations8,905 10,389 8,265 (27,559)— 
Net income before taxes103,148 31,802 30,383 (86,049)79,284 
Federal and state income taxes28,173 8,101 7,810 (26,784)17,300 
Net income
74,975 23,701 22,573 (59,265)61,984 
Net income (loss) attributable to non-controlling interests— — — (95)(95)
Net income attributable to BOK Financial Corp. shareholders$74,975 $23,701 $22,573 $(59,170)$62,079 
Average assets$24,687,976 $9,850,853 $12,723,412 $(1,541,623)$45,720,618 
v3.21.1
Fees and Commissions Revenue Fees and Commissions Rvenue (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Fees and Commissions Revenue [Table Text Block]
Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2021.
CommercialConsumerWealth ManagementFunds Management & OtherConsolidated
Out of Scope1
In Scope2
Trading revenue$— $— $3,716 $— $3,716 $3,716 $— 
Customer hedging revenue
4,207 — 91 (1,706)2,592 2,592 — 
Retail brokerage revenue
— — 4,741 — 4,741 — 4,741 
Insurance brokerage revenue
— — 2,916 — 2,916 — 2,916 
Investment banking revenue
2,258 — 4,768 (209)6,817 2,049 4,768 
Brokerage and trading revenue
6,465 — 16,232 (1,915)20,782 8,357 12,425 
TransFund EFT network revenue18,443 834 (13)2 19,266 — 19,266 
Merchant services revenue2,266 16 — (1)2,281 — 2,281 
Corporate card revenue804 — 28 51 883 — 883 
Transaction card revenue21,513 850 15 52 22,430 — 22,430 
Personal trust revenue— — 21,977 — 21,977 — 21,977 
Corporate trust revenue— — 3,789 — 3,789 — 3,789 
Institutional trust & retirement plan services revenue
— — 12,610 — 12,610 — 12,610 
Investment management services and other revenue
— — 2,903 43 2,946 — 2,946 
Fiduciary and asset management revenue
— — 41,279 43 41,322 — 41,322 
Commercial account service charge revenue
11,988 434 581 1 13,004 — 13,004 
Overdraft fee revenue26 4,635 19 — 4,680 — 4,680 
Check card revenue
— 5,327 — — 5,327 — 5,327 
Automated service charge and other deposit fee revenue
26 1,150 23 (1)1,198 — 1,198 
Deposit service charges and fees
12,040 11,546 623 — 24,209 — 24,209 
Mortgage production revenue— 25,287 — — 25,287 25,287 — 
Mortgage servicing revenue— 12,277 — (451)11,826 11,826 — 
Mortgage banking revenue— 37,564 — (451)37,113 37,113 — 
Other revenue9,829 2,340 7,535 (3,408)16,296 13,143 3,153 
Total fees and commissions revenue
$49,847 $52,300 $65,684 $(5,679)$162,152 $58,613 $103,539 
1     Out of scope revenue generally relates to financial instruments or contractual rights and obligations within the scope of other applicable accounting guidance.
2    In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
Fees and commissions revenue by reportable segment and primary service line is as follows for the three months ended March 31, 2020.
CommercialConsumerWealth ManagementFunds Management & OtherConsolidated
Out of Scope1
In Scope2
Trading revenue$— $— $34,384 $— $34,384 $34,384 $— 
Customer hedging revenue
2,525 — 135 563 3,223 3,223 — 
Retail brokerage revenue
— — 4,343 — 4,343 — 4,343 
Insurance brokerage revenue
— — 3,789 — 3,789 — 3,789 
Investment banking revenue
1,880 — 3,160 — 5,040 1,828 3,212 
Brokerage and trading revenue
4,405 — 45,811 563 50,779 39,435 11,344 
TransFund EFT network revenue18,212 831 (19)2 19,026 — 19,026 
Merchant services revenue2,305 14 — — 2,319 — 2,319 
Corporate card revenue520 — 16 — 536 — 536 
Transaction card revenue21,037 845 (3)2 21,881 — 21,881 
Personal trust revenue— — 20,649 — 20,649 — 20,649 
Corporate trust revenue— — 6,362 — 6,362 — 6,362 
Institutional trust & retirement plan services revenue
— — 11,896 — 11,896 — 11,896 
Investment management services and other revenue
— — 5,592 (41)5,551 — 5,551 
Fiduciary and asset management revenue
— — 44,499 (41)44,458 — 44,458 
Commercial account service charge revenue
11,039 410 545 (1)11,993 — 11,993 
Overdraft fee revenue49 7,205 22 2 7,278 — 7,278 
Check card revenue
— 5,229 — — 5,229 — 5,229 
Automated service charge and other deposit fee revenue
229 1,386 13 2 1,630 — 1,630 
Deposit service charges and fees
11,317 14,230 580 3 26,130 — 26,130 
Mortgage production revenue— 21,569 — — 21,569 21,569 — 
Mortgage servicing revenue— 16,042 — (444)15,598 15,598 — 
Mortgage banking revenue— 37,611 — (444)37,167 37,167 — 
Other revenue4,700 2,376 6,994 (1,761)12,309 8,408 3,901 
Total fees and commissions revenue
$41,459 $55,062 $97,881 $(1,678)$192,724 $85,010 $107,714 
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.
v3.21.1
Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021 (in thousands):
 TotalQuoted 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 securities$33,613 $2,070 $31,543 $— 
Residential agency mortgage-backed securities5,003,163 — 5,003,163 — 
Municipal securities27,047 — 27,047 — 
Other trading securities22,126 — 22,126 — 
Total trading securities5,085,949 2,070 5,083,879 — 
Available for sale securities:    
U.S. Treasury506 506 — — 
Municipal securities245,657 — 245,657 — 
Residential agency mortgage-backed securities9,705,314 — 9,705,314 — 
Residential non-agency mortgage-backed securities31,382 — 31,382 — 
Commercial agency mortgage-backed securities
3,426,727 — 3,426,727 — 
Other debt securities471 — — 471 
Total available for sale securities13,410,057 506 13,409,080 471 
Fair value option securities – Residential agency mortgage-backed securities72,498 — 72,498 — 
Residential mortgage loans held for sale1
284,447 — 279,151 5,296 
Mortgage servicing rights2
132,915 — — 132,915 
Derivative contracts, net of cash collateral3
1,289,156 2,772 1,286,384 — 
Liabilities: 
Derivative contracts, net of cash collateral3
719,556 2,721 716,835 — 
1Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.55% of the unpaid principal balance.
2A 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 5, Mortgage Banking Activities.
3See 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 interest rate and agricultural derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate and energy derivative contracts, net of cash margin.
The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2020 (in thousands):
 TotalQuoted 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 securities$9,183 $4,999 $4,184 $— 
Residential agency mortgage-backed securities4,669,148 — 4,669,148 — 
Municipal securities19,172 — 19,172 — 
Other trading securities10,472 — 10,472 — 
Total trading securities4,707,975 4,999 4,702,976 — 
Available for sale securities:    
U.S. Treasury508 508 — — 
Municipal securities167,979 — 167,979 — 
Residential agency mortgage-backed securities9,340,471 — 9,340,471 — 
Residential non-agency mortgage-backed securities32,770 — 32,770 — 
Commercial agency mortgage-backed securities
3,508,465 — 3,508,465 — 
Other debt securities472 — — 472 
Total available for sale securities13,050,665 508 13,049,685 472 
Fair value option securities — Residential agency mortgage-backed securities114,982 — 114,982 — 
Residential mortgage loans held for sale1
252,316 — 245,299 7,017 
Mortgage servicing rights2
101,172 — — 101,172 
Derivative contracts, net of cash collateral3
810,688 10,780 799,908 — 
Liabilities:
Derivative contracts, net of cash collateral3
405,779 — 405,779 — 
1Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance.
2A 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 5, Mortgage Banking Activities.
3See 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 contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural contracts, fully offset by cash margin.
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 March 31, 2021 for which the fair value was adjusted during the three months ended March 31, 2021:
Fair Value Adjustments for the
 Carrying Value at March 31, 2021Three Months Ended
Mar. 31, 2021 Recognized in:
 Quoted Prices
in Active Markets for Identical Instruments		Significant
Other
Observable
Inputs		Significant
Unobservable
Inputs		Gross charge-offs against allowance for loan lossesNet losses (gains) and operating expenses of repossessed assets
Nonaccruing loans$— $259 $34,046 $15,049 $— 
Real estate and other repossessed assets
— 1,706 300 — 2,200 
 
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 March 31, 2020 for which the fair value was adjusted during the three months ended March 31, 2020:
Fair Value Adjustments for the
 Carrying Value at March 31, 2020Three Months Ended
Mar. 31, 2020 Recognized in:
 Quoted Prices
in Active Markets for Identical Instruments		Significant
Other
Observable
Inputs		Significant
Unobservable
Inputs		Gross charge-offs against allowance for loan lossesNet losses (gains) and operating expenses of repossessed assets
Nonaccruing loans$— $293 $22,746 $15,789 $— 
Real estate and other repossessed assets
— 1,066 400 — 226 
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 March 31, 2021 follows (in thousands):

Fair ValueValuation Technique(s)Unobservable InputRange
(Weighted Average)
Nonaccruing loans$34,046 Discounted cash flowsManagement 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
10% - 91% (47%)1
Real estate and other repossessed assets300 Discounted cash flowsManagement knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costsN/A
1 Represents fair value as a percentage of the unpaid principal balance.

A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of March 31, 2020 follows (in thousands):

Fair ValueValuation Technique(s)Unobservable InputRange
(Weighted Average)
Nonaccruing loans$22,746 Discounted cash flowsManagement 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
6% - 71% (36%)1
Real estate and other repossessed assets400 Appraised value, as adjusted
Marketability adjustments off appraised value2
87% - 87% (87%)
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.
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 March 31, 2021 (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$723,983 $723,983 $723,983 $— $— 
Interest-bearing cash and cash equivalents695,213 695,213 695,213 — — 
Trading securities:
U.S. government securities33,613 33,613 2,070 31,543 — 
Residential agency mortgage-backed securities5,003,163 5,003,163 — 5,003,163 — 
Municipal securities27,047 27,047 — 27,047 — 
Other trading securities22,126 22,126 — 22,126 — 
Total trading securities5,085,949 5,085,949 2,070 5,083,879 — 
Investment securities:  
Municipal securities216,047 241,278 — 67,510 173,768 
Residential agency mortgage-backed securities8,477 9,216 — 9,216 — 
Other debt securities2,214 2,213 — 2,213 — 
Total investment securities226,738 252,707 — 78,939 173,768 
Allowance for credit losses(617)— — — — 
Investment securities, net of allowance226,121 252,707 — 78,939 173,768 
Available for sale securities:  
U.S. Treasury506 506 506 — — 
Municipal securities245,657 245,657 — 245,657 — 
Residential agency mortgage-backed securities9,705,314 9,705,314 — 9,705,314 — 
Residential non-agency mortgage-backed securities31,382 31,382 — 31,382 — 
Commercial agency mortgage-backed securities
3,426,727 3,426,727 — 3,426,727 — 
Other debt securities471 471 — — 471 
Total available for sale securities13,410,057 13,410,057 506 13,409,080 471 
Fair value option securities – Residential agency mortgage-backed securities72,498 72,498 — 72,498 — 
Residential mortgage loans held for sale284,447 284,447 — 279,151 5,296 
Loans:  
Commercial12,657,784 12,546,069 — — 12,546,069 
Commercial real estate4,503,347 4,435,740 — — 4,435,740 
Paycheck protection program1,848,550 1,820,749 — — 1,820,749 
Loans to individuals3,524,166 3,528,950 — — 3,528,950 
Total loans22,533,847 22,331,508 — — 22,331,508 
Allowance for loan losses(352,402)— — — — 
Loans, net of allowance22,181,445 22,331,508 — — 22,331,508 
Mortgage servicing rights132,915 132,915 — — 132,915 
Derivative instruments with positive fair value, net of cash collateral
1,289,156 1,289,156 2,772 1,286,384 — 
Deposits with no stated maturity35,848,270 35,848,270 — — 35,848,270 
Time deposits2,004,356 2,008,294 — — 2,008,294 
Other borrowed funds2,503,678 2,500,771 — — 2,500,771 
Subordinated debentures276,024 288,109 — 288,109 — 
Derivative instruments with negative fair value, net of cash collateral
719,556 719,556 2,721 716,835 — 
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, 2020 (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$798,757 $798,757 $798,757 $— $— 
Interest-bearing cash and cash equivalents381,816 381,816 381,816 — — 
Trading securities:
U.S. government securities9,183 9,183 4,999 4,184 — 
Residential agency mortgage-backed securities4,669,148 4,669,148 — 4,669,148 — 
Municipal securities19,172 19,172 — 19,172 — 
Other trading securities10,472 10,472 — 10,472 — 
Total trading securities4,707,975 4,707,975 4,999 4,702,976 — 
Investment securities:  
Municipal securities229,245 255,270 — 69,404 185,866 
Residential agency mortgage-backed securities8,913 9,790 — 9,790 — 
Other debt securities7,373 7,371 — 7,371 — 
Total investment securities245,531 272,431 — 86,565 185,866 
Allowance for credit losses(688)0— 00
Investment securities, net of allowance244,843 272,431 — 86,565 185,866 
Available for sale securities:  
U.S. Treasury508 508 508 — — 
Municipal securities167,979 167,979 — 167,979 — 
Residential agency mortgage-backed securities9,340,471 9,340,471 — 9,340,471 — 
Residential non-agency mortgage-backed securities32,770 32,770 — 32,770 — 
Commercial agency mortgage-backed securities
3,508,465 3,508,465 — 3,508,465 — 
Other debt securities472 472 — — 472 
Total available for sale securities13,050,665 13,050,665 508 13,049,685 472 
Fair value option securities — Residential agency mortgage-backed securities114,982 114,982 — 114,982 — 
Residential mortgage loans held for sale252,316 252,316 — 245,299 7,017 
Loans:  
Commercial13,077,535 13,003,383 — — 13,003,383 
Commercial real estate4,698,538 4,649,763 — — 4,649,763 
Paycheck protection program1,682,310 1,669,461 — — 1,669,461 
Loans to individuals3,549,137 3,563,199 — — 3,563,199 
Total loans23,007,520 22,885,806 — — 22,885,806 
Allowance for loan losses(388,640)— — — — 
Loans, net of allowance22,618,880 22,885,806 — — 22,885,806 
Mortgage servicing rights101,172 101,172 — — 101,172 
Derivative instruments with positive fair value, net of cash collateral
810,688 810,688 10,780 799,908 — 
Deposits with no stated maturity34,176,752 34,176,752 — — 34,176,752 
Time deposits1,967,128 1,976,936 — — 1,976,936 
Other borrowed funds3,545,356 3,542,489 — — 3,542,489 
Subordinated debentures276,005 269,544 — 269,544 — 
Derivative instruments with negative fair value, net of cash collateral
405,779 405,779 — 405,779 — 
v3.21.1
Significant Accounting Policies Loans and Allowance for Credit Losses (Details)
 3 Months Ended
Mar. 31, 2021
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
v3.21.1
Trading Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Trading Securities [Line Items]    
Trading securities $ 5,085,949 $ 4,707,975
Trading Securities, Net Unrealized Gain (Loss) (10,965) (3,560)
U.S. government securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 33,613 9,183
Trading Securities, Net Unrealized Gain (Loss) (239) 0
Residential agency mortgage-backed securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 5,003,163 4,669,148
Trading Securities, Net Unrealized Gain (Loss) (10,647) (3,624)
Municipal securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 27,047 19,172
Trading Securities, Net Unrealized Gain (Loss) (49) 42
Other debt securities [Member]    
Schedule of Trading Securities [Line Items]    
Trading securities 22,126 10,472
Trading Securities, Net Unrealized Gain (Loss) $ (30) $ 22
v3.21.1
Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 226,738 $ 245,531
Investment securities, Allowance for Credit Loss (617) (688)
Investments securities, Amortized Cost, Net of Allowance 226,121 244,843
Investment Securities, Fair Value 252,707 272,431
Investment Securities, Gross Unrealized Gain 26,134 27,046
Investment Securities, Gross Unrealized Loss $ (165) $ (146)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 7 8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,465 $ 2,701
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,035 2,068
Investment Securities, Continuous Unrealized Loss Position, Fair Value 4,500 4,769
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 52 41
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 113 105
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 165 146
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 27,143  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 76,456  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 106,311  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 8,351  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 218,261  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 27,866  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 85,490  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 121,763  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 8,372  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 243,491  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 4.95  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 216,047 229,245
Investment Securities, Fair Value 241,278 255,270
Investment Securities, Gross Unrealized Gain 25,395 26,169
Investment Securities, Gross Unrealized Loss $ (164) $ (144)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 6 6
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,440 $ 2,451
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,035 2,043
Investment Securities, Continuous Unrealized Loss Position, Fair Value 4,475 4,494
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 51 40
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 113 104
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 164 144
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 2,214 7,373
Investment Securities, Fair Value 2,213 7,371
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (1) $ (2)
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 $ 25 $ 250
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 25
Investment Securities, Continuous Unrealized Loss Position, Fair Value 25 275
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 1
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1 2
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 8,477 8,913
Investment Securities, Fair Value 9,216 9,790
Investment Securities, Gross Unrealized Gain 739 877
Investment Securities, Gross Unrealized Loss 0 $ 0
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [2] 8,477  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 9,216  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4.4 years  
[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 4.4 years based upon current prepayment assumptions.
v3.21.1
Available for Sale Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 13,119,840   $ 12,609,850
Available-for-sale Securities, Fair Value 13,410,057   13,050,665
Available-for-sale Securities, Gross Unrealized Gain 358,610   449,654
Available-for-sale Securities, Gross Unrealized Loss (68,393)   (8,839)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale Securities, Proceeds 56,037 $ 26,894  
Available-for-sale Securities, Gross realized gains 473 3  
Available-for-sale Securities, Gross realized losses (6) 0  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 119 $ 1  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value $ 11,200,000   $ 11,600,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 232   77
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,903,355   $ 1,143,562
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 67,232   8,197
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 445,591   438,846
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,161   642
Debt Securities, Available-for-sale, Unrealized Loss Position 4,348,946   1,582,408
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 68,393   8,839
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 71,119    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,562,072    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,379,950    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 607,208    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 3,620,349    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 71,223    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,610,227    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,373,270    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 618,641    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 3,673,361    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 7.76    
U.S. Treasury [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 500   500
Available-for-sale Securities, Fair Value 506   508
Available-for-sale Securities, Gross Unrealized Gain 6   8
Available-for-sale Securities, Gross Unrealized Loss 0   0
Municipal securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 248,016   165,318
Available-for-sale Securities, Fair Value 245,657   167,979
Available-for-sale Securities, Gross Unrealized Gain 1,422   2,666
Available-for-sale Securities, Gross Unrealized Loss $ (3,781)   $ (5)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 81   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 186,267   $ 6,166
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,781   5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0   0
Debt Securities, Available-for-sale, Unrealized Loss Position 186,267   6,166
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 3,781   5
Commercial agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 3,371,333   3,406,956
Available-for-sale Securities, Fair Value 3,426,727   3,508,465
Available-for-sale Securities, Gross Unrealized Gain 74,722   103,590
Available-for-sale Securities, Gross Unrealized Loss $ (19,328)   $ (2,081)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 60   37
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 711,113   $ 350,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 18,623   1,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 305,406   277,627
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 705   494
Debt Securities, Available-for-sale, Unrealized Loss Position 1,016,519   628,133
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 19,328   2,081
Other debt securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 500   500
Available-for-sale Securities, Fair Value 471   472
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (29)   $ (28)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   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, Less than 12 Months, Accumulated Loss 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 471   472
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 29   28
Debt Securities, Available-for-sale, Unrealized Loss Position 471   472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 29   28
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] 9,499,491    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 9,736,696    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 3.9 years    
Residential agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 9,483,601   9,019,013
Available-for-sale Securities, Fair Value 9,705,314   9,340,471
Available-for-sale Securities, Gross Unrealized Gain 266,968   328,183
Available-for-sale Securities, Gross Unrealized Loss $ (45,255)   $ (6,725)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 90   38
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,005,975   $ 786,890
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 44,828   6,605
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 139,714   160,747
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 427   120
Debt Securities, Available-for-sale, Unrealized Loss Position 3,145,689   947,637
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 45,255   6,725
Residential non-agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 15,890   17,563
Available-for-sale Securities, Fair Value 31,382   32,770
Available-for-sale Securities, Gross Unrealized Gain 15,492   15,207
Available-for-sale Securities, Gross Unrealized Loss $ 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 3.9 years based upon current prepayment assumptions.
v3.21.1
Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 232 77
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,903,355 $ 1,143,562
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 445,591 438,846
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,348,946 1,582,408
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 67,232 8,197
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,161 642
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 68,393 $ 8,839
Municipal 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 81 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 186,267 $ 6,166
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 186,267 6,166
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,781 5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 3,781 $ 5
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 90 38
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,005,975 $ 786,890
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 139,714 160,747
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,145,689 947,637
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 44,828 6,605
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 427 120
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 45,255 $ 6,725
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 60 37
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 711,113 $ 350,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 305,406 277,627
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,016,519 628,133
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 18,623 1,587
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 705 494
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 19,328 $ 2,081
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 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 471 472
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 471 472
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 29 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 29 $ 28
v3.21.1
Securities Fair Value Option Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value $ 72,498 $ 114,982
Residential agency mortgage-backed securities [Member]    
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value 72,498 114,982
Fair value option securities, Net Unrealized Gain (Loss) $ 3,233 $ 4,463
v3.21.1
Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 1,289,156 $ 810,688
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 719,556 405,779
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 76,195,298 [1] 93,418,715 [2]
Derivative Liabilities, Notional 75,375,971 [1] 96,326,522 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,847,005 1,294,849
Derivative Assets, Netting Adjustments (556,235) (456,498)
Derivative Assets, Net Fair Value Before Cash Collateral 1,290,770 838,351
Derivative Assets, Cash Collateral (1,614) (27,663)
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,884,011 1,231,665
Derivative Liabilities, Netting Adjustments (556,235) (456,498)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,327,776 775,167
Derivative Liabilities, Cash Collateral (608,220) (369,388)
Derivative Liabilities, Fair Value, Net of Cash Collateral 719,556 405,779
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 7,597,406 [1] 7,425,999 [2]
Derivative Liabilities, Notional 7,564,738 [1] 7,251,350 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,043,939 836,870
Derivative Assets, Netting Adjustments (163,485) (211,612)
Derivative Assets, Net Fair Value Before Cash Collateral 880,454 625,258
Derivative Assets, Cash Collateral (840) (705)
Derviative contracts, net of cash collateral, Assets, Fair value 879,614 624,553
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,028,545 811,335
Derivative Liabilities, Netting Adjustments (163,485) (211,612)
Derivative Liabilities, Net Fair Value Before Cash Collateral 865,060 599,723
Derivative Liabilities, Cash Collateral (504,386) (223,281)
Derivative Liabilities, Fair Value, Net of Cash Collateral 360,674 376,442
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,221,571 [1] 3,212,469 [2]
Derivative Liabilities, Notional 3,221,571 [1] 3,212,469 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 79,353 113,524
Derivative Assets, Netting Adjustments (9,135) (144)
Derivative Assets, Net Fair Value Before Cash Collateral 70,218 113,380
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 70,218 113,380
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 79,619 113,900
Derivative Liabilities, Netting Adjustments (9,135) (144)
Derivative Liabilities, Net Fair Value Before Cash Collateral 70,484 113,756
Derivative Liabilities, Cash Collateral (60,429) (104,202)
Derivative Liabilities, Fair Value, Net of Cash Collateral 10,055 9,554
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,930,367 [1] 3,791,565 [2]
Derivative Liabilities, Notional 3,897,430 [1] 3,617,678 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 618,401 386,008
Derivative Assets, Netting Adjustments (152,837) (211,468)
Derivative Assets, Net Fair Value Before Cash Collateral 465,564 174,540
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 465,564 174,540
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 602,728 361,334
Derivative Liabilities, Netting Adjustments (152,837) (211,468)
Derivative Liabilities, Net Fair Value Before Cash Collateral 449,891 149,866
Derivative Liabilities, Cash Collateral (443,933) (114,070)
Derivative Liabilities, Fair Value, Net of Cash Collateral 5,958 35,796
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 32,893 [1] 14,765 [2]
Derivative Liabilities, Notional 32,893 [1] 14,781 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,629 3,859
Derivative Assets, Netting Adjustments (1,513) 0
Derivative Assets, Net Fair Value Before Cash Collateral 116 3,859
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 116 3,859
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,609 3,844
Derivative Liabilities, Netting Adjustments (1,513) 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 96 3,844
Derivative Liabilities, Cash Collateral 0 (3,844)
Derivative Liabilities, Fair Value, Net of Cash Collateral 96 0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 346,897 [1] 337,001 [2]
Derivative Liabilities, Notional 347,166 [1] 336,223 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 343,101 332,257
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 343,101 332,257
Derivative Assets, Cash Collateral (540) (420)
Derviative contracts, net of cash collateral, Assets, Fair value 342,561 331,837
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 343,134 331,035
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 343,134 331,035
Derivative Liabilities, Cash Collateral (24) (1,165)
Derivative Liabilities, Fair Value, Net of Cash Collateral 343,110 329,870
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 65,678 [1] 70,199 [2]
Derivative Liabilities, Notional 65,678 [1] 70,199 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,455 1,222
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 1,455 1,222
Derivative Assets, Cash Collateral (300) (285)
Derviative contracts, net of cash collateral, Assets, Fair value 1,155 937
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,455 1,222
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,455 1,222
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 1,455 1,222
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 67,796,867 [1] 84,997,593 [2]
Derivative Liabilities, Notional 66,746,760 [1] 88,929,916 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 785,765 440,627
Derivative Assets, Netting Adjustments (380,313) (240,655)
Derivative Assets, Net Fair Value Before Cash Collateral 405,452 199,972
Derivative Assets, Cash Collateral (774) (26,958)
Derviative contracts, net of cash collateral, Assets, Fair value 404,678 173,014
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 834,430 414,801
Derivative Liabilities, Netting Adjustments (380,313) (240,655)
Derivative Liabilities, Net Fair Value Before Cash Collateral 454,117 174,146
Derivative Liabilities, Cash Collateral (99,371) (145,692)
Derivative Liabilities, Fair Value, Net of Cash Collateral 354,746 28,454
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 801,025 [1] 995,123 [2]
Derivative Liabilities, Notional 1,064,473 [1] 145,256 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 17,301 17,352
Derivative Assets, Netting Adjustments (12,437) (4,231)
Derivative Assets, Net Fair Value Before Cash Collateral 4,864 13,121
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 4,864 13,121
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 21,036 5,529
Derivative Liabilities, Netting Adjustments (12,437) (4,231)
Derivative Liabilities, Net Fair Value Before Cash Collateral 8,599 1,298
Derivative Liabilities, Cash Collateral (4,463) (415)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 4,136 $ 883
[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.
v3.21.1
Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue $ (68,667) $ (37,433)
Gain (Loss) on Derivatives, Net (27,650) 18,420
Total customer risk management programs    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 2,592 3,222
Gain (Loss) on Derivatives, Net 0 0
Interest rate contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 1,388 942
Gain (Loss) on Derivatives, Net 0 0
Energy contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 1,020 2,007
Gain (Loss) on Derivatives, Net 0 0
Agricultural contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 18 15
Gain (Loss) on Derivatives, Net 0 0
Foreign exchange contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 166 258
Gain (Loss) on Derivatives, Net 0 0
Equity option contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 0 0
Gain (Loss) on Derivatives, Net 0 0
Trading [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue [1] (71,259) (40,655)
Gain (Loss) on Derivatives, Net [1] 0 0
Internal risk management programs [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 0 0
Gain (Loss) on Derivatives, Net $ (27,650) $ 18,420
[1] Represents changes in fair value of to-be-announced securities and other derivative instruments held to mitigate market risk of trading securities portfolio, which is offset by changes in fair value of trading securities also include in Brokerage and Trading Revenue in the Consolidated Statements of Earnings.
v3.21.1
Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest $ 8,279,725 $ 8,078,873
Loans, variable rate of interest 14,038,103 14,693,954
Loans, non-accrual 216,019 234,693
Total 22,533,847 23,007,520
Credit Commitments [Abstract]    
Outstanding commitments to extend credit 11,200,000  
Outstanding standby letters of credit 714,000  
Commercial [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 3,264,973 3,174,203
Loans, variable rate of interest 9,245,738 9,736,173
Loans, non-accrual 147,073 167,159
Total 12,657,784 13,077,535
Commercial real estate [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 1,019,531 1,047,486
Loans, variable rate of interest 3,456,573 3,623,806
Loans, non-accrual 27,243 27,246
Total 4,503,347 4,698,538
Paycheck Protection Program [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 1,848,550 1,682,310
Loans, variable rate of interest 0 0
Loans, non-accrual 0 0
Total 1,848,550 1,682,310
Loans to individuals [Member]    
Loan receivables disclosure [Abstract]    
Loans, fixed rate of interest 2,146,671 2,174,874
Loans, variable rate of interest 1,335,792 1,333,975
Loans, non-accrual 41,703 40,288
Total $ 3,524,166 $ 3,549,137
v3.21.1
Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 388,640 $ 236,568  
Provision for loan losses (21,770) 95,964  
Loans charged off (16,905) (18,917)  
Recoveries of loans previously charged off 2,437 1,696  
Ending balance 352,402 315,311  
Provision Details [Abstract]      
Change in provision due to changes in reasonable and supportable forecasts, primarily due to COVID-19 pandemic (31,100)    
Other changes to provision 5,200    
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 36,921 25,137  
Provision for off-balance sheet credit risk (4,044) 3,377  
Ending balance 32,877 28,514  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 22,317,828   $ 22,772,827
Individually measured for impairment, recorded investment 216,019   234,693
Total 22,533,847   23,007,520
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 332,351   366,199
Individually measured for impairment, related allowance 20,051   22,441
Total 352,402   388,640
Commercial [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 254,934 151,868  
Provision for loan losses (9,893) 77,723  
Loans charged off (15,345) (16,615)  
Recoveries of loans previously charged off 1,676 462  
Ending balance 231,372 213,438  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 14,422 11,578  
Provision for off-balance sheet credit risk (1,686) 2,462  
Ending balance 12,736 14,040  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 12,510,711   12,910,376
Individually measured for impairment, recorded investment 147,073   167,159
Total 12,657,784   13,077,535
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 214,711   235,882
Individually measured for impairment, related allowance 16,661   19,052
Total 231,372   254,934
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 86,558 47,185  
Provision for loan losses (4,579) 5,115  
Loans charged off (263) (886)  
Recoveries of loans previously charged off 30 47  
Ending balance 81,746 51,461  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 20,571 11,767  
Provision for off-balance sheet credit risk (2,273) 808  
Ending balance 18,298 12,575  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 4,476,104   4,671,292
Individually measured for impairment, recorded investment 27,243   27,246
Total 4,503,347   4,698,538
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 78,356   83,169
Individually measured for impairment, related allowance 3,390   3,389
Total 81,746   86,558
Paycheck Protection Program [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0 0  
Provision for loan losses 0 0  
Loans charged off 0 0  
Recoveries of loans previously charged off 0 0  
Ending balance 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 0 0  
Provision for off-balance sheet credit risk 0 0  
Ending balance 0 0  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 1,848,550   1,682,310
Individually measured for impairment, recorded investment 0   0
Total 1,848,550   1,682,310
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 0   0
Individually measured for impairment, related allowance 0   0
Total 0   0
Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 47,148 37,515  
Provision for loan losses (7,298) 13,126  
Loans charged off (1,297) (1,416)  
Recoveries of loans previously charged off 731 1,187  
Ending balance 39,284 50,412  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 1,928 1,792  
Provision for off-balance sheet credit risk (85) 107  
Ending balance 1,843 1,899  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 3,482,463   3,508,849
Individually measured for impairment, recorded investment 41,703   40,288
Total 3,524,166   3,549,137
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 39,284   47,148
Individually measured for impairment, related allowance 0   0
Total 39,284   $ 47,148
Nonspecific Allowance [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0 0  
Provision for loan losses 0 0  
Loans charged off 0 0  
Recoveries of loans previously charged off 0 0  
Ending balance 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 0 0  
Provision for off-balance sheet credit risk 0 0  
Ending balance $ 0 0  
Previously Reported [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   210,759  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   1,585  
Previously Reported [Member] | Commercial [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   118,187  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   1,434  
Previously Reported [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   51,805  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   107  
Previously Reported [Member] | Paycheck Protection Program [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   0  
Previously Reported [Member] | Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   23,572  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   44  
Previously Reported [Member] | Nonspecific Allowance [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   17,195  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   0  
Transition Adjustment [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   25,809  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   23,552  
Transition Adjustment [Member] | Commercial [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   33,681  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   10,144  
Transition Adjustment [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   (4,620)  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   11,660  
Transition Adjustment [Member] | Paycheck Protection Program [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   0  
Transition Adjustment [Member] | Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   13,943  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   1,748  
Transition Adjustment [Member] | Nonspecific Allowance [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   (17,195)  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   $ 0  
v3.21.1
Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One $ 1,281,763 $ 4,855,463
Financing Receivable, Originated, Year Two 4,485,179 3,161,473
Financing Receivable, Originated, Year Three 3,046,366 2,651,833
Financing Receivable, Originated, Year Four 2,353,485 1,788,880
Financing Receivable, Originated, Year Five 1,645,058 1,356,476
Financing Receivable, Originated, More Than Five Years 4,060,444 3,054,469
Financing Receivable, Revolving 5,632,687 6,108,767
Financing Receivable, Revolving, Converted to Term Loan 28,865 30,159
Total 22,533,847 23,007,520
Commercial [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 495,201 1,657,760
Financing Receivable, Originated, Year Two 1,609,600 1,557,142
Financing Receivable, Originated, Year Three 1,477,237 1,461,282
Financing Receivable, Originated, Year Four 1,340,841 1,013,619
Financing Receivable, Originated, Year Five 948,479 747,318
Financing Receivable, Originated, More Than Five Years 2,162,219 1,603,533
Financing Receivable, Revolving 4,621,212 5,033,683
Financing Receivable, Revolving, Converted to Term Loan 2,995 3,198
Total 12,657,784 13,077,535
Commercial [Member] | Energy [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 80,102 157,690
Financing Receivable, Originated, Year Two 126,717 55,833
Financing Receivable, Originated, Year Three 55,688 90,799
Financing Receivable, Originated, Year Four 80,149 7,178
Financing Receivable, Originated, Year Five 6,731 13,815
Financing Receivable, Originated, More Than Five Years 33,281 29,020
Financing Receivable, Revolving 2,819,820 3,114,859
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,202,488 3,469,194
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 114,646 536,745
Financing Receivable, Originated, Year Two 570,755 642,739
Financing Receivable, Originated, Year Three 645,309 639,676
Financing Receivable, Originated, Year Four 616,403 423,763
Financing Receivable, Originated, Year Five 394,541 234,531
Financing Receivable, Originated, More Than Five Years 794,617 680,890
Financing Receivable, Revolving 154,487 147,646
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,290,758 3,305,990
Commercial [Member] | Services [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 182,186 540,265
Financing Receivable, Originated, Year Two 547,870 452,269
Financing Receivable, Originated, Year Three 394,254 399,264
Financing Receivable, Originated, Year Four 347,450 326,282
Financing Receivable, Originated, Year Five 320,352 381,902
Financing Receivable, Originated, More Than Five Years 1,023,831 700,028
Financing Receivable, Revolving 605,378 707,891
Financing Receivable, Revolving, Converted to Term Loan 627 682
Total 3,421,948 3,508,583
Commercial [Member] | General business [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 118,267 423,060
Financing Receivable, Originated, Year Two 364,258 406,301
Financing Receivable, Originated, Year Three 381,986 331,543
Financing Receivable, Originated, Year Four 296,839 256,396
Financing Receivable, Originated, Year Five 226,855 117,070
Financing Receivable, Originated, More Than Five Years 310,490 193,595
Financing Receivable, Revolving 1,041,527 1,063,287
Financing Receivable, Revolving, Converted to Term Loan 2,368 2,516
Total 2,742,590 2,793,768
Commercial real estate [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 73,306 725,577
Financing Receivable, Originated, Year Two 812,635 1,219,638
Financing Receivable, Originated, Year Three 1,224,195 954,485
Financing Receivable, Originated, Year Four 799,248 506,146
Financing Receivable, Originated, Year Five 448,630 325,092
Financing Receivable, Originated, More Than Five Years 981,532 744,404
Financing Receivable, Revolving 163,764 223,158
Financing Receivable, Revolving, Converted to Term Loan 37 38
Total 4,503,347 4,698,538
Paycheck Protection Program [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 544,128 1,682,310
Financing Receivable, Originated, Year Two 1,304,422 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 0
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 1,848,550 1,682,310
Loans to individuals [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 169,128 789,816
Financing Receivable, Originated, Year Two 758,522 384,693
Financing Receivable, Originated, Year Three 344,934 236,066
Financing Receivable, Originated, Year Four 213,396 269,115
Financing Receivable, Originated, Year Five 247,949 284,066
Financing Receivable, Originated, More Than Five Years 916,693 706,532
Financing Receivable, Revolving 847,711 851,926
Financing Receivable, Revolving, Converted to Term Loan 25,833 26,923
Total 3,524,166 3,549,137
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 124,830 565,006
Financing Receivable, Originated, Year Two 535,429 149,947
Financing Receivable, Originated, Year Three 119,990 124,678
Financing Receivable, Originated, Year Four 104,023 125,714
Financing Receivable, Originated, Year Five 104,373 160,870
Financing Receivable, Originated, More Than Five Years 461,434 371,059
Financing Receivable, Revolving 322,936 340,316
Financing Receivable, Revolving, Converted to Term Loan 24,463 25,413
Total 1,797,478 1,863,003
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 4,859
Financing Receivable, Originated, Year Two 7,101 33,880
Financing Receivable, Originated, Year Three 32,171 35,009
Financing Receivable, Originated, Year Four 36,062 43,099
Financing Receivable, Originated, Year Five 45,744 58,573
Financing Receivable, Originated, More Than Five Years 298,973 233,267
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 420,051 408,687
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 44,298 219,951
Financing Receivable, Originated, Year Two 215,992 200,866
Financing Receivable, Originated, Year Three 192,773 76,379
Financing Receivable, Originated, Year Four 73,311 100,302
Financing Receivable, Originated, Year Five 97,832 64,623
Financing Receivable, Originated, More Than Five Years 156,286 102,206
Financing Receivable, Revolving 524,775 511,610
Financing Receivable, Revolving, Converted to Term Loan 1,370 1,510
Total 1,306,637 1,277,447
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 63,102 112,614
Financing Receivable, Originated, Year Two 81,658 51,863
Financing Receivable, Originated, Year Three 51,881 89,346
Financing Receivable, Originated, Year Four 78,812 7,178
Financing Receivable, Originated, Year Five 6,731 1,148
Financing Receivable, Originated, More Than Five Years 8,019 7,956
Financing Receivable, Revolving 2,388,115 2,548,663
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 2,678,318 2,818,768
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 17,000 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 0
Financing Receivable, Revolving 144,976 202,590
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 161,976 202,590
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 24,000
Financing Receivable, Originated, Year Two 24,051 1,363
Financing Receivable, Originated, Year Three 1,319 1,453
Financing Receivable, Originated, Year Four 1,337 0
Financing Receivable, Originated, Year Five 0 12,667
Financing Receivable, Originated, More Than Five Years 11,922 0
Financing Receivable, Revolving 221,765 283,294
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 260,394 322,777
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 114,646 536,745
Financing Receivable, Originated, Year Two 570,755 615,221
Financing Receivable, Originated, Year Three 617,791 638,302
Financing Receivable, Originated, Year Four 615,371 422,834
Financing Receivable, Originated, Year Five 394,541 234,399
Financing Receivable, Originated, More Than Five Years 780,397 658,286
Financing Receivable, Revolving 153,973 147,132
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,247,474 3,252,919
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 27,500
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 504 8,282
Financing Receivable, Revolving 5 5
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 509 35,787
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 27,500 1,191
Financing Receivable, Originated, Year Four 1,032 929
Financing Receivable, Originated, Year Five 0 132
Financing Receivable, Originated, More Than Five Years 11,056 11,387
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 39,588 13,639
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 182,186 534,853
Financing Receivable, Originated, Year Two 542,579 436,384
Financing Receivable, Originated, Year Three 381,122 372,867
Financing Receivable, Originated, Year Four 327,241 307,374
Financing Receivable, Originated, Year Five 300,688 373,785
Financing Receivable, Originated, More Than Five Years 1,005,483 683,936
Financing Receivable, Revolving 574,095 665,491
Financing Receivable, Revolving, Converted to Term Loan 627 682
Total 3,314,021 3,375,372
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 150
Financing Receivable, Originated, Year Two 138 9,057
Financing Receivable, Originated, Year Three 1,446 389
Financing Receivable, Originated, Year Four 1,008 291
Financing Receivable, Originated, Year Five 7 2,038
Financing Receivable, Originated, More Than Five Years 1,844 2,000
Financing Receivable, Revolving 1,971 3,063
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 6,414 16,988
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 429
Financing Receivable, Originated, Year Two 421 6,380
Financing Receivable, Originated, Year Three 11,238 26,008
Financing Receivable, Originated, Year Four 18,435 6,027
Financing Receivable, Originated, Year Five 5,288 5,030
Financing Receivable, Originated, More Than Five Years 9,471 7,954
Financing Receivable, Revolving 28,627 38,797
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 73,480 90,625
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 118,267 419,756
Financing Receivable, Originated, Year Two 361,002 394,985
Financing Receivable, Originated, Year Three 370,674 310,273
Financing Receivable, Originated, Year Four 274,644 236,222
Financing Receivable, Originated, Year Five 209,218 103,987
Financing Receivable, Originated, More Than Five Years 297,857 186,600
Financing Receivable, Revolving 1,032,658 1,055,878
Financing Receivable, Revolving, Converted to Term Loan 2,305 2,316
Total 2,666,625 2,710,017
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 197
Financing Receivable, Originated, Year Two 189 4,519
Financing Receivable, Originated, Year Three 4,850 9,713
Financing Receivable, Originated, Year Four 3,401 7,803
Financing Receivable, Originated, Year Five 7,469 2,511
Financing Receivable, Originated, More Than Five Years 1,781 3,159
Financing Receivable, Revolving 4,903 2,483
Financing Receivable, Revolving, Converted to Term Loan 0 19
Total 22,593 30,404
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 1,432
Financing Receivable, Originated, Year Two 1,392 3,069
Financing Receivable, Originated, Year Three 2,575 6,694
Financing Receivable, Originated, Year Four 12,901 10,935
Financing Receivable, Originated, Year Five 8,738 10,042
Financing Receivable, Originated, More Than Five Years 10,287 3,729
Financing Receivable, Revolving 3,408 4,449
Financing Receivable, Revolving, Converted to Term Loan 18 140
Total 39,319 40,490
Performing [Member] | Commercial real estate [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 73,306 725,577
Financing Receivable, Originated, Year Two 812,635 1,211,338
Financing Receivable, Originated, Year Three 1,215,895 954,226
Financing Receivable, Originated, Year Four 796,047 489,193
Financing Receivable, Originated, Year Five 430,066 314,899
Financing Receivable, Originated, More Than Five Years 951,180 722,475
Financing Receivable, Revolving 163,737 223,131
Financing Receivable, Revolving, Converted to Term Loan 37 38
Total 4,442,903 4,640,877
Performing [Member] | Commercial real estate [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 259
Financing Receivable, Originated, Year Four 3,201 12,311
Financing Receivable, Originated, Year Five 14,110 2,725
Financing Receivable, Originated, More Than Five Years 6,900 5,831
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 24,211 21,126
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 4,410
Financing Receivable, Originated, Year Five 4,454 0
Financing Receivable, Originated, More Than Five Years 4,509 4,852
Financing Receivable, Revolving 27 27
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 8,990 9,289
Performing [Member] | Paycheck Protection Program [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 544,128 1,682,310
Financing Receivable, Originated, Year Two 1,304,422 0
Financing Receivable, Originated, Year Three 0 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 0
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 1,848,550 1,682,310
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 124,830 564,325
Financing Receivable, Originated, Year Two 534,781 149,832
Financing Receivable, Originated, Year Three 119,866 120,875
Financing Receivable, Originated, Year Four 100,259 124,930
Financing Receivable, Originated, Year Five 103,645 158,801
Financing Receivable, Originated, More Than Five Years 433,347 348,292
Financing Receivable, Revolving 318,319 335,259
Financing Receivable, Revolving, Converted to Term Loan 23,567 24,553
Total 1,758,614 1,826,867
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 33
Financing Receivable, Originated, Year Two 22 11
Financing Receivable, Originated, Year Three 0 2,094
Financing Receivable, Originated, Year Four 1,851 0
Financing Receivable, Originated, Year Five 0 59
Financing Receivable, Originated, More Than Five Years 3,429 318
Financing Receivable, Revolving 204 950
Financing Receivable, Revolving, Converted to Term Loan 74 10
Total 5,580 3,475
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 51
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 0 34
Financing Receivable, Revolving 400 272
Financing Receivable, Revolving, Converted to Term Loan 0 76
Total 400 433
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 4,859
Financing Receivable, Originated, Year Two 7,101 33,880
Financing Receivable, Originated, Year Three 32,171 34,464
Financing Receivable, Originated, Year Four 35,189 43,099
Financing Receivable, Originated, Year Five 45,744 58,264
Financing Receivable, Originated, More Than Five Years 291,282 226,380
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 411,487 400,946
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 44,298 219,873
Financing Receivable, Originated, Year Two 215,962 200,580
Financing Receivable, Originated, Year Three 192,533 76,246
Financing Receivable, Originated, Year Four 73,230 100,229
Financing Receivable, Originated, Year Five 97,757 64,104
Financing Receivable, Originated, More Than Five Years 155,714 102,126
Financing Receivable, Revolving 524,716 510,571
Financing Receivable, Revolving, Converted to Term Loan 1,370 1,510
Total 1,305,580 1,275,239
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 39
Financing Receivable, Originated, Year Two 28 55
Financing Receivable, Originated, Year Three 14 66
Financing Receivable, Originated, Year Four 21 0
Financing Receivable, Originated, Year Five 2 469
Financing Receivable, Originated, More Than Five Years 474 31
Financing Receivable, Revolving 12 965
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 551 1,625
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 11
Financing Receivable, Originated, Year Two 0 214
Financing Receivable, Originated, Year Three 215 10
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 17 0
Financing Receivable, Revolving 19 29
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 251 264
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 21,076
Financing Receivable, Originated, Year Two 21,008 2,607
Financing Receivable, Originated, Year Three 2,488 0
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 13,340 21,064
Financing Receivable, Revolving 64,964 80,312
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 101,800 125,059
Nonperforming Financial Instruments [Member] | Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 18
Financing Receivable, Originated, Year Three 18 183
Financing Receivable, Originated, Year Four 0 0
Financing Receivable, Originated, Year Five 0 0
Financing Receivable, Originated, More Than Five Years 2,660 2,935
Financing Receivable, Revolving 509 509
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 3,187 3,645
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 4,833
Financing Receivable, Originated, Year Two 4,732 448
Financing Receivable, Originated, Year Three 448 0
Financing Receivable, Originated, Year Four 766 12,590
Financing Receivable, Originated, Year Five 14,369 1,049
Financing Receivable, Originated, More Than Five Years 7,033 6,138
Financing Receivable, Revolving 685 540
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 28,033 25,598
Nonperforming Financial Instruments [Member] | Commercial [Member] | General business [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 1,675
Financing Receivable, Originated, Year Two 1,675 3,728
Financing Receivable, Originated, Year Three 3,887 4,863
Financing Receivable, Originated, Year Four 5,893 1,436
Financing Receivable, Originated, Year Five 1,430 530
Financing Receivable, Originated, More Than Five Years 565 107
Financing Receivable, Revolving 558 477
Financing Receivable, Revolving, Converted to Term Loan 45 41
Total 14,053 12,857
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 8,300
Financing Receivable, Originated, Year Three 8,300 0
Financing Receivable, Originated, Year Four 0 232
Financing Receivable, Originated, Year Five 0 7,468
Financing Receivable, Originated, More Than Five Years 18,943 11,246
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 27,243 27,246
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 648
Financing Receivable, Originated, Year Two 626 104
Financing Receivable, Originated, Year Three 124 1,658
Financing Receivable, Originated, Year Four 1,913 784
Financing Receivable, Originated, Year Five 728 2,010
Financing Receivable, Originated, More Than Five Years 24,658 22,415
Financing Receivable, Revolving 4,013 3,835
Financing Receivable, Revolving, Converted to Term Loan 822 774
Total 32,884 32,228
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 0
Financing Receivable, Originated, Year Two 0 0
Financing Receivable, Originated, Year Three 0 545
Financing Receivable, Originated, Year Four 873 0
Financing Receivable, Originated, Year Five 0 309
Financing Receivable, Originated, More Than Five Years 7,691 6,887
Financing Receivable, Revolving 0 0
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total 8,564 7,741
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccrual [Member]    
Financing Receivable, Credit Quality Indicator Line Items [Abstract]    
Financing Receivable, Originated, Year One 0 28
Financing Receivable, Originated, Year Two 2 17
Financing Receivable, Originated, Year Three 11 57
Financing Receivable, Originated, Year Four 60 73
Financing Receivable, Originated, Year Five 73 50
Financing Receivable, Originated, More Than Five Years 81 49
Financing Receivable, Revolving 28 45
Financing Receivable, Revolving, Converted to Term Loan 0 0
Total $ 255 $ 319
v3.21.1
Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual $ 216,019 $ 234,693
Financing Receivable, Nonaccrual, No Allowance 144,555 167,878
Financing Receivable, Nonaccrual, With Allowance 71,464 66,815
Financing Receivable, Nonaccrual, Related Allowance 20,051 22,441
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 147,073 167,159
Financing Receivable, Nonaccrual, No Allowance 89,210 113,945
Financing Receivable, Nonaccrual, With Allowance 57,863 53,214
Financing Receivable, Nonaccrual, Related Allowance 16,661 19,052
Commercial [Member] | Energy [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 101,800 125,059
Financing Receivable, Nonaccrual, No Allowance 48,042 76,633
Financing Receivable, Nonaccrual, With Allowance 53,758 48,426
Financing Receivable, Nonaccrual, Related Allowance 13,893 16,478
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 3,187 3,645
Financing Receivable, Nonaccrual, No Allowance 3,187 3,645
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Commercial [Member] | Services [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 28,033 25,598
Financing Receivable, Nonaccrual, No Allowance 24,046 20,810
Financing Receivable, Nonaccrual, With Allowance 3,987 4,788
Financing Receivable, Nonaccrual, Related Allowance 2,650 2,574
Commercial [Member] | General business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 14,053 12,857
Financing Receivable, Nonaccrual, No Allowance 13,935 12,857
Financing Receivable, Nonaccrual, With Allowance 118 0
Financing Receivable, Nonaccrual, Related Allowance 118 0
Commercial real estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 27,243 27,246
Financing Receivable, Nonaccrual, No Allowance 13,642 13,645
Financing Receivable, Nonaccrual, With Allowance 13,601 13,601
Financing Receivable, Nonaccrual, Related Allowance 3,390 3,389
Loans to individuals [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 41,703 40,288
Financing Receivable, Nonaccrual, No Allowance 41,703 40,288
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 32,884 32,228
Financing Receivable, Nonaccrual, No Allowance 32,884 32,228
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 255 319
Financing Receivable, Nonaccrual, No Allowance 255 319
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
US Government Agency Insured Loans [Member] | Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 8,564 7,741
Financing Receivable, Nonaccrual, No Allowance 8,564 7,741
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance $ 0 $ 0
v3.21.1
Loans and Allowances for Credit Losses, Troubled Debt Restructurings (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled Debt Restructuring, Recorded Investment $ 186,000,000   $ 187,000,000
Troubled Debt Restructuring, Performing in Accordance With Modified Terms 103,000,000   95,000,000
Troubled Debt Restructuring, Recorded Balance Modified During the Period 13,000,000 $ 28,000,000  
Troubled Debt Restructuring, Charge-offs 306,000 $ 2,000,000.0  
Residential mortgage [Member] | Loans to individuals [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled Debt Restructuring, Specific Allowance 0    
Residential mortgage [Member] | Nonperforming Financial Instruments [Member] | Loans to individuals [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled Debt Restructuring, Recorded Investment 17,000,000    
US Government Agency Insured Loans [Member] | Residential mortgage [Member] | Performing [Member] | Loans to individuals [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled Debt Restructuring, Recorded Investment $ 155,000,000   $ 152,000,000
v3.21.1
Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing receivable, recorded investment, aging [Abstract]    
Current $ 22,292,878 $ 22,718,498
Total 22,533,847 23,007,520
Past Due 90 Days or More and Accruing 77,404 88,718
30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 67,117 68,013
60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 15,565 38,782
90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 158,287 182,227
Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 12,598,053 12,978,801
Total 12,657,784 13,077,535
Past Due 90 Days or More and Accruing 145 4,821
Commercial [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 9,503 17,219
Commercial [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,051 10,504
Commercial [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 48,177 71,011
Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,183,861 3,410,995
Total 3,202,488 3,469,194
Past Due 90 Days or More and Accruing 0 0
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 12,735
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 4,050
Commercial [Member] | Energy [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 18,627 41,414
Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,287,571 3,302,345
Total 3,290,758 3,305,990
Past Due 90 Days or More and Accruing 0 0
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 3,187 3,645
Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,404,154 3,489,423
Total 3,421,948 3,508,583
Past Due 90 Days or More and Accruing 0 326
Commercial [Member] | Services [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,791 3,278
Commercial [Member] | Services [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 208 177
Commercial [Member] | Services [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 15,795 15,705
Commercial [Member] | General business [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 2,722,467 2,776,038
Total 2,742,590 2,793,768
Past Due 90 Days or More and Accruing 145 4,495
Commercial [Member] | General business [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,712 1,206
Commercial [Member] | General business [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,843 6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 10,568 10,247
Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,482,750 4,672,279
Total 4,503,347 4,698,538
Past Due 90 Days or More and Accruing 0 5,126
Commercial real estate [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 134 276
Commercial real estate [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 5,310
Commercial real estate [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 20,463 20,673
Paycheck Protection Program [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,848,550 1,682,310
Total 1,848,550 1,682,310
Past Due 90 Days or More and Accruing 0 0
Paycheck Protection Program [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
Paycheck Protection Program [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
Paycheck Protection Program [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
Loans to individuals [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,363,525 3,385,108
Total 3,524,166 3,549,137
Past Due 90 Days or More and Accruing 77,259 78,771
Loans to individuals [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 57,480 50,518
Loans to individuals [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 13,514 22,968
Loans to individuals [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 89,647 90,543
Loans to individuals [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,782,825 1,849,304
Total 1,797,478 1,863,003
Past Due 90 Days or More and Accruing 250 181
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,215 5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 415 837
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,023 7,050
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 274,265 262,102
Total 420,051 408,687
Past Due 90 Days or More and Accruing 77,009 78,349
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 50,175 41,389
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 13,059 22,041
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 82,552 83,155
Loans to individuals [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,306,435 1,273,702
Total 1,306,637 1,277,447
Past Due 90 Days or More and Accruing 0 241
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 90 3,317
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 40 90
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due $ 72 $ 338
v3.21.1
Mortgage Banking Activities, Components of Loans Held For Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
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   90
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 260,005   227,161
Residential mortgage loans held for sale, Fair value 262,333   236,444
Residential mortgage loans held for sale $ 284,447   $ 252,316
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   60
General number of days outstanding for residential mortgage commitments, maximum (in days) 90   90
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Derivative, Notional Amount $ 387,465   $ 380,637
Derivative, Net fair value $ 11,455   $ 20,435
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   60
General number of days for delivery for loans, for which the price is set by forward sales contracts, maximum (in days) 90   90
Components of Residential Mortgage Loans Held for Sale [Abstract]      
Derivative, Notional Amount $ 584,743   $ 549,414
Derivative, Net fair value $ 10,659   $ (4,563)
v3.21.1
Mortgage Banking Activities Mortgage Banking Activities, Mortgage Banking Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mortgage Banking Revenue [Abstract]    
Net realized gains on sale of mortgage loans $ 26,000 $ 9,717
Net change in unrealized gain (loss) on mortgage loans held for sale (6,955) 3,561
Net change in the fair value of mortgage loan commitments (8,980) 19,017
Net change in the fair value of forward sales contracts 15,222 (10,725)
Total production revenue 25,287 21,570
Servicing revenue 11,826 15,597
Total mortgage banking revenue $ 37,113 $ 37,167
v3.21.1
Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Summary of Mortgage Servicing Rights [Abstract]      
Number of residential mortgage loans serviced for others 101,912   106,201
Outstanding principal balance of residential mortgage loans serviced for others $ 15,458,772,000   $ 16,228,449,000
Weighted average interest rate 3.78%   3.84%
Remaining term (in months) 279   280
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 101,172,000 $ 201,886,000 $ 201,886,000
Additions 9,830,000 5,441,000  
Change in fair value due to principal payments (11,961,000) (8,019,000)  
Change in fair value due to market assumption changes 33,874,000 (88,480,000)  
Ending balance $ 132,915,000 $ 110,828,000 $ 101,172,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]      
Discount rate - risk-free rate plus a market premium (in hundredths) 9.13%   9.14%
Prepayment rate - based upon loan interest rate, original term and loan type, minimum 6.37%   9.41%
Prepayment rate - based upon loan interest rate, original term and loan type, maximum 17.80%   21.87%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan) $ 69   $ 69
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan) 94   94
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) 1.04%   0.43%
Primary secondary mortgage rate spread 105   105
Delinquency rate 2.77%   3.54%
v3.21.1
Commitments and Contingent Liabilities (Details)
 3 Months Ended
Mar. 31, 2021
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
Principal amount of entered judgment against the principal individual and his wife 36,805,051
Pre-judgment interest amount of entered judgment against the principal individual and his wife $ 10,937,831
Pending Litigation [Member] | Inclusion of Proprietary Investment Products as Investment Options in 401k Plan Whose Fees Were Too High and Performance Too Low [Member]  
Litigation Settlement [Abstract]  
Loss Contingency, Number of Plaintiffs 3
Pending Litigation [Member] | Bank breached various fiduciary duties acting in its capacity as trustee of a trust that was a co-general partner of the partnership  
Litigation Settlement [Abstract]  
Loss Contingency, Damages Sought, Value $ 60,000,000
v3.21.1
Commitments and Contingent Liabilities Variable Interest Entities (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Other Assets [Member]  
Variable Interest Entity [Line Items]  
Amortization Method Qualified Affordable Housing Project Investments $ 319
Other Liabilities [Member]  
Variable Interest Entity [Line Items]  
Qualified Affordable Housing Project Investments, Commitment $ 104
v3.21.1
Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
May 04, 2021
Mar. 31, 2021
Mar. 31, 2020
Dividends declared (in dollars per share)   $ 0.52 $ 0.51
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, Beginning of Period   $ 335,868 $ 104,923
Net change in unrealized gain (loss)   (150,131) 297,843
Reclassification Adjustments Included in Earnings [Abstract]      
Gain on available for sale securities, net   (467) (3)
Other comprehensive income, before income taxes   (150,598) 297,840
Federal and state income taxes   (36,139) 71,471
Other comprehensive income, net of income taxes   (114,459) 226,369
Balance, End of Period   221,409 331,292
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]      
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, Beginning of Period   335,032 104,996
Net change in unrealized gain (loss)   (150,131) 297,843
Reclassification Adjustments Included in Earnings [Abstract]      
Gain on available for sale securities, net   (467) (3)
Other comprehensive income, before income taxes   (150,598) 297,840
Federal and state income taxes   (36,139) 71,471
Other comprehensive income, net of income taxes   (114,459) 226,369
Balance, End of Period   220,573 331,365
Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member]      
Schedule of Accumulated Other Income (Loss) [Abstract]      
Balance, Beginning of Period   836 (73)
Net change in unrealized gain (loss)   0 0
Reclassification Adjustments Included in Earnings [Abstract]      
Gain on available for sale securities, net   0 0
Other comprehensive income, before income taxes   0 0
Federal and state income taxes   0 0
Other comprehensive income, net of income taxes   0 0
Balance, End of Period   $ 836 $ (73)
Subsequent Event [Member]      
Dividends Payable, Date Declared May 04, 2021    
Dividends declared (in dollars per share) $ 0.52    
Dividends Payable, Date to be Paid May 27, 2021    
Dividends Payable, Date of Record May 17, 2021    
v3.21.1
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator: [Abstract]    
Net income attributable to BOK Financial Corp. shareholders $ 146,060 $ 62,079
Less: Earnings allocated to participating securities 937 343
Numerator for basic earnings per share – income available to common shareholders 145,123 61,736
Effect of reallocating undistributed earnings of participating securities 0 0
Numerator for diluted earnings per share – income available to common shareholders $ 145,123 $ 61,736
Denominator: [Abstract]    
Weighted average shares outstanding (in shares) 69,583,788 70,513,807
Less: Participating securities included in weighted average shares (in shares) 446,413 390,122
Denominator for basic earnings per common share (in shares) 69,137,375 70,123,685
Dilutive effect of employee stock compensation plans (in shares) 4,335 6,481
Denominator for diluted earnings per common share (in shares) 69,141,710 70,130,166
Basic earnings per share $ 2.10 $ 0.88
Diluted earnings per share $ 2.10 $ 0.88
v3.21.1
Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Net interest revenue from external sources $ 280,420 $ 261,360
Net interest revenue (expense) from internal sources 0 0
Net interest revenue 280,420 261,360
Provision for credit losses (25,000) 93,771
Net interest revenue after provision for credit losses 305,420 167,589
Other operating revenue 163,897 180,319
Other operating expense 282,627 268,624
Net direct contribution 186,690 79,284
Gain (loss) on financial instruments, net 0 0
Change in fair value of mortgage servicing rights 0 0
Gain (loss) on repossessed assets, net 0 0
Corporate expense allocations 0 0
Net income before taxes 186,690 79,284
Federal and state income taxes 42,382 17,300
Net income 144,308 61,984
Net income (loss) attributable to non-controlling interests (1,752) (95)
Net income attributable to BOK Financial Corp. shareholders 146,060 62,079
Average assets 50,310,633 45,720,618
Operating Segments [Member] | Commercial [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 155,799 201,902
Net interest revenue (expense) from internal sources (25,794) (50,495)
Net interest revenue 130,005 151,407
Provision for credit losses 13,985 16,880
Net interest revenue after provision for credit losses 116,020 134,527
Other operating revenue 46,579 38,220
Other operating expense 66,979 60,752
Net direct contribution 95,620 111,995
Gain (loss) on financial instruments, net 33 49
Change in fair value of mortgage servicing rights 0 0
Gain (loss) on repossessed assets, net 12,737 9
Corporate expense allocations 12,734 8,905
Net income before taxes 95,656 103,148
Federal and state income taxes 25,983 28,173
Net income 69,673 74,975
Net income (loss) attributable to non-controlling interests 0 0
Net income attributable to BOK Financial Corp. shareholders 69,673 74,975
Average assets 28,047,052 24,687,976
Operating Segments [Member] | Consumer [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 16,686 25,876
Net interest revenue (expense) from internal sources 4,288 18,056
Net interest revenue 20,974 43,932
Provision for credit losses 1,136 1,256
Net interest revenue after provision for credit losses 19,838 42,676
Other operating revenue 52,282 55,062
Other operating expense 55,743 53,844
Net direct contribution 16,377 43,894
Gain (loss) on financial instruments, net (29,616) 86,764
Change in fair value of mortgage servicing rights 33,874 (88,480)
Gain (loss) on repossessed assets, net 41 13
Corporate expense allocations 11,487 10,389
Net income before taxes 9,189 31,802
Federal and state income taxes 2,340 8,101
Net income 6,849 23,701
Net income (loss) attributable to non-controlling interests 0 0
Net income attributable to BOK Financial Corp. shareholders 6,849 23,701
Average assets 9,755,539 9,850,853
Operating Segments [Member] | Wealth Management [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 48,554 14,366
Net interest revenue (expense) from internal sources (200) 4,538
Net interest revenue 48,354 18,904
Provision for credit losses (29) (48)
Net interest revenue after provision for credit losses 48,383 18,952
Other operating revenue 66,123 97,881
Other operating expense 78,565 78,192
Net direct contribution 35,941 38,641
Gain (loss) on financial instruments, net 0 7
Change in fair value of mortgage servicing rights 0 0
Gain (loss) on repossessed assets, net 0 0
Corporate expense allocations 9,887 8,265
Net income before taxes 26,054 30,383
Federal and state income taxes 6,672 7,810
Net income 19,382 22,573
Net income (loss) attributable to non-controlling interests 0 0
Net income attributable to BOK Financial Corp. shareholders 19,382 22,573
Average assets 18,645,865 12,723,412
Funds Management and Other [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 59,381 19,216
Net interest revenue (expense) from internal sources 21,706 27,901
Net interest revenue 81,087 47,117
Provision for credit losses (40,092) 75,683
Net interest revenue after provision for credit losses 121,179 (28,566)
Other operating revenue (1,087) (10,844)
Other operating expense 81,340 75,836
Net direct contribution 38,752 (115,246)
Gain (loss) on financial instruments, net 29,583 (86,820)
Change in fair value of mortgage servicing rights (33,874) 88,480
Gain (loss) on repossessed assets, net (12,778) (22)
Corporate expense allocations (34,108) (27,559)
Net income before taxes 55,791 (86,049)
Federal and state income taxes 7,387 (26,784)
Net income 48,404 (59,265)
Net income (loss) attributable to non-controlling interests (1,752) (95)
Net income attributable to BOK Financial Corp. shareholders 50,156 (59,170)
Average assets $ (6,137,823) $ (1,541,623)
v3.21.1
Fees and Commissions Revenue Fees and Commissions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total fees and commissions $ 162,152 $ 192,724
Fees and commissions revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 162,152 192,724
Fees and commission revenue not from contracts with customers 58,613 [1] 85,010 [2]
Fees and commissions revenue from contracts with customers 103,539 [3] 107,714 [4]
Brokerage and trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 20,782 50,779
Fees and commission revenue not from contracts with customers 8,357 [1] 39,435 [2]
Fees and commissions revenue from contracts with customers 12,425 [3] 11,344 [4]
Trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 3,716 34,384
Fees and commission revenue not from contracts with customers 3,716 [1] 34,384 [2]
Fees and commissions revenue from contracts with customers 0 [3] 0 [4]
Customer hedging revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,592 3,223
Fees and commission revenue not from contracts with customers 2,592 [1] 3,223 [2]
Fees and commissions revenue from contracts with customers 0 [3] 0 [4]
Retail brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 4,741 4,343
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 4,741 [3] 4,343 [4]
Insurance brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,916 3,789
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 2,916 [3] 3,789 [4]
Investment banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 6,817 5,040
Fees and commission revenue not from contracts with customers 2,049 [1] 1,828 [2]
Fees and commissions revenue from contracts with customers 4,768 [3] 3,212 [4]
Transaction card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 22,430 21,881
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 22,430 [3] 21,881 [4]
TransFund EFT network revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 19,266 19,026
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 19,266 [3] 19,026 [4]
Merchant services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,281 2,319
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 2,281 [3] 2,319 [4]
Corporate card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 883 536
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 883 [3] 536 [4]
Fiduciary and asset management revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 41,322 44,458
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 41,322 [3] 44,458 [4]
Personal trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 21,977 20,649
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 21,977 [3] 20,649 [4]
Corporate trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 3,789 6,362
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 3,789 [3] 6,362 [4]
Institutional trust & retirement plan services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 12,610 11,896
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 12,610 [3] 11,896 [4]
Investment management services and other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,946 5,551
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 2,946 [3] 5,551 [4]
Deposit service charges and fees [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 24,209 26,130
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 24,209 [3] 26,130 [4]
Commercial account service charge revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 13,004 11,993
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 13,004 [3] 11,993 [4]
Overdraft fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 4,680 7,278
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 4,680 [3] 7,278 [4]
Check card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 5,327 5,229
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 5,327 [3] 5,229 [4]
Automated service charge and other deposit fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 1,198 1,630
Fees and commission revenue not from contracts with customers 0 [1] 0 [2]
Fees and commissions revenue from contracts with customers 1,198 [3] 1,630 [4]
Mortgage banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 37,113 37,167
Fees and commission revenue not from contracts with customers 37,113 [1] 37,167 [2]
Fees and commissions revenue from contracts with customers 0 [3] 0 [4]
Mortgage production revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 25,287 21,569
Fees and commission revenue not from contracts with customers 25,287 [1] 21,569 [2]
Fees and commissions revenue from contracts with customers 0 [3] 0 [4]
Mortgage servicing revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 11,826 15,598
Fees and commission revenue not from contracts with customers 11,826 [1] 15,598 [2]
Fees and commissions revenue from contracts with customers 0 [3] 0 [4]
Other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 16,296 12,309
Fees and commission revenue not from contracts with customers 13,143 [1] 8,408 [2]
Fees and commissions revenue from contracts with customers 3,153 [3] 3,901 [4]
Operating Segments [Member] | Commercial [Member] | Fees and commissions revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 49,847 41,459
Operating Segments [Member] | Commercial [Member] | Brokerage and trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 6,465 4,405
Operating Segments [Member] | Commercial [Member] | Trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Customer hedging revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 4,207 2,525
Operating Segments [Member] | Commercial [Member] | Retail brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Insurance brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Investment banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,258 1,880
Operating Segments [Member] | Commercial [Member] | Transaction card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 21,513 21,037
Operating Segments [Member] | Commercial [Member] | TransFund EFT network revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 18,443 18,212
Operating Segments [Member] | Commercial [Member] | Merchant services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,266 2,305
Operating Segments [Member] | Commercial [Member] | Corporate card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 804 520
Operating Segments [Member] | Commercial [Member] | Fiduciary and asset management revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Personal trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Corporate trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 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
Operating Segments [Member] | Commercial [Member] | Investment management services and other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Deposit service charges and fees [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 12,040 11,317
Operating Segments [Member] | Commercial [Member] | Commercial account service charge revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 11,988 11,039
Operating Segments [Member] | Commercial [Member] | Overdraft fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 26 49
Operating Segments [Member] | Commercial [Member] | Check card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 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 26 229
Operating Segments [Member] | Commercial [Member] | Mortgage banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Mortgage production revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Mortgage servicing revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Commercial [Member] | Other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 9,829 4,700
Operating Segments [Member] | Consumer [Member] | Fees and commissions revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 52,300 55,062
Operating Segments [Member] | Consumer [Member] | Brokerage and trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Customer hedging revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Retail brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Insurance brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Investment banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Transaction card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 850 845
Operating Segments [Member] | Consumer [Member] | TransFund EFT network revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 834 831
Operating Segments [Member] | Consumer [Member] | Merchant services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 16 14
Operating Segments [Member] | Consumer [Member] | Corporate card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Fiduciary and asset management revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Personal trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Corporate trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 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
Operating Segments [Member] | Consumer [Member] | Investment management services and other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Consumer [Member] | Deposit service charges and fees [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 11,546 14,230
Operating Segments [Member] | Consumer [Member] | Commercial account service charge revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 434 410
Operating Segments [Member] | Consumer [Member] | Overdraft fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 4,635 7,205
Operating Segments [Member] | Consumer [Member] | Check card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 5,327 5,229
Operating Segments [Member] | Consumer [Member] | Automated service charge and other deposit fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 1,150 1,386
Operating Segments [Member] | Consumer [Member] | Mortgage banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 37,564 37,611
Operating Segments [Member] | Consumer [Member] | Mortgage production revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 25,287 21,569
Operating Segments [Member] | Consumer [Member] | Mortgage servicing revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 12,277 16,042
Operating Segments [Member] | Consumer [Member] | Other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,340 2,376
Operating Segments [Member] | Wealth Management [Member] | Fees and commissions revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 65,684 97,881
Operating Segments [Member] | Wealth Management [Member] | Brokerage and trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 16,232 45,811
Operating Segments [Member] | Wealth Management [Member] | Trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 3,716 34,384
Operating Segments [Member] | Wealth Management [Member] | Customer hedging revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 91 135
Operating Segments [Member] | Wealth Management [Member] | Retail brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 4,741 4,343
Operating Segments [Member] | Wealth Management [Member] | Insurance brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,916 3,789
Operating Segments [Member] | Wealth Management [Member] | Investment banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 4,768 3,160
Operating Segments [Member] | Wealth Management [Member] | Transaction card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 15 (3)
Operating Segments [Member] | Wealth Management [Member] | TransFund EFT network revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (13) (19)
Operating Segments [Member] | Wealth Management [Member] | Merchant services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Wealth Management [Member] | Corporate card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 28 16
Operating Segments [Member] | Wealth Management [Member] | Fiduciary and asset management revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 41,279 44,499
Operating Segments [Member] | Wealth Management [Member] | Personal trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 21,977 20,649
Operating Segments [Member] | Wealth Management [Member] | Corporate trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 3,789 6,362
Operating Segments [Member] | Wealth Management [Member] | Institutional trust & retirement plan services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 12,610 11,896
Operating Segments [Member] | Wealth Management [Member] | Investment management services and other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2,903 5,592
Operating Segments [Member] | Wealth Management [Member] | Deposit service charges and fees [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 623 580
Operating Segments [Member] | Wealth Management [Member] | Commercial account service charge revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 581 545
Operating Segments [Member] | Wealth Management [Member] | Overdraft fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 19 22
Operating Segments [Member] | Wealth Management [Member] | Check card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 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 23 13
Operating Segments [Member] | Wealth Management [Member] | Mortgage banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Wealth Management [Member] | Mortgage production revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Wealth Management [Member] | Mortgage servicing revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Operating Segments [Member] | Wealth Management [Member] | Other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 7,535 6,994
Funds Management and Other [Member] | Fees and commissions revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (5,679) (1,678)
Funds Management and Other [Member] | Brokerage and trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (1,915) 563
Funds Management and Other [Member] | Trading revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Customer hedging revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (1,706) 563
Funds Management and Other [Member] | Retail brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Insurance brokerage revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Investment banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (209) 0
Funds Management and Other [Member] | Transaction card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 52 2
Funds Management and Other [Member] | TransFund EFT network revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 2 2
Funds Management and Other [Member] | Merchant services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (1) 0
Funds Management and Other [Member] | Corporate card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 51 0
Funds Management and Other [Member] | Fiduciary and asset management revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 43 (41)
Funds Management and Other [Member] | Personal trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Corporate trust revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Institutional trust & retirement plan services revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Investment management services and other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 43 (41)
Funds Management and Other [Member] | Deposit service charges and fees [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 3
Funds Management and Other [Member] | Commercial account service charge revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 1 (1)
Funds Management and Other [Member] | Overdraft fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 2
Funds Management and Other [Member] | Check card revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Automated service charge and other deposit fee revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (1) 2
Funds Management and Other [Member] | Mortgage banking revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (451) (444)
Funds Management and Other [Member] | Mortgage production revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions 0 0
Funds Management and Other [Member] | Mortgage servicing revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions (451) (444)
Funds Management and Other [Member] | Other revenue [Member]    
Disaggregation of Revenue [Line Items]    
Total fees and commissions $ (3,408) $ (1,761)
[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] In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
[4] In scope revenue represents revenue subject to FASB ASC Topic 606, Revenue from Contracts with Customers.
v3.21.1
Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets: [Abstract]        
Trading securities $ 5,085,949 $ 4,707,975    
Available for sale securities 13,410,057 13,050,665    
Fair value option securities 72,498 114,982    
Mortgage servicing rights 132,915 101,172 $ 110,828 $ 201,886
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 33,613 9,183    
Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 5,003,163 4,669,148    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 27,047 19,172    
Available for sale securities 245,657 167,979    
U.S. Treasury [Member]        
Assets: [Abstract]        
Available for sale securities 506 508    
Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 31,382 32,770    
Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 3,426,727 3,508,465    
Other debt securities [Member]        
Assets: [Abstract]        
Trading securities 22,126 10,472    
Available for sale securities 471 472    
Fair Value, Recurring [Member]        
Assets: [Abstract]        
Trading securities 5,085,949 4,707,975    
Available for sale securities 13,410,057 13,050,665    
Fair value option securities   114,982    
Residential mortgage loans held for sale 284,447 [1] 252,316 [2]    
Mortgage servicing rights 132,915 [3] 101,172 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 [5] 810,688 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 [5] 405,779 [6]    
Fair Value, Recurring [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 33,613 9,183    
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 5,003,163 4,669,148    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498      
Fair Value, Recurring [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 27,047 19,172    
Available for sale securities 245,657 167,979    
Fair Value, Recurring [Member] | U.S. Treasury [Member]        
Assets: [Abstract]        
Available for sale securities 506 508    
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 31,382 32,770    
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 3,426,727 3,508,465    
Fair Value, Recurring [Member] | Other debt securities [Member]        
Assets: [Abstract]        
Trading securities 22,126 10,472    
Available for sale securities 471 472    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Assets: [Abstract]        
Trading securities 2,070 4,999    
Available for sale securities 506 508    
Fair value option securities   0    
Residential mortgage loans held for sale 0 [1] 0 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 2,772 [5] 10,780 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 2,721 [5] 0 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 2,070 4,999    
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      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 0 0    
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]        
Assets: [Abstract]        
Available for sale securities 506 508    
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 5,083,879 4,702,976    
Available for sale securities 13,409,080 13,049,685    
Fair value option securities   114,982    
Residential mortgage loans held for sale 279,151 [1] 245,299 [2]    
Mortgage servicing rights 0 [3] 0 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 1,286,384 [5] 799,908 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value 716,835 [5] 405,779 [6]    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]        
Assets: [Abstract]        
Trading securities 31,543 4,184    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Trading securities 5,003,163 4,669,148    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 27,047 19,172    
Available for sale securities 245,657 167,979    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]        
Assets: [Abstract]        
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 31,382 32,770    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]        
Assets: [Abstract]        
Available for sale securities 3,426,727 3,508,465    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]        
Assets: [Abstract]        
Trading securities 22,126 10,472    
Available for sale securities 0 0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Assets: [Abstract]        
Trading securities 0 0    
Available for sale securities 471 472    
Fair value option securities   0    
Residential mortgage loans held for sale 5,296 [1] 7,017 [2]    
Mortgage servicing rights 132,915 [3] 101,172 [4]    
Derviative contracts, net of cash collateral, Assets, Fair value 0 [5] 0 [6]    
Liabilities: [Abstract]        
Derivative contracts, net of cash collateral, Liabilities, Fair Value $ 0 [5] $ 0 [6]    
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 94.55% 94.57%    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government securities [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      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal securities [Member]        
Assets: [Abstract]        
Trading securities 0 0    
Available for sale securities   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, 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 $ 471 $ 472    
[1] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.55% of the unpaid principal balance.
[2] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance.
[3] 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 5, Mortgage Banking Activities.
[4] 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 5, Mortgage Banking Activities.
[5] 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 interest rate and agricultural derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate and energy derivative contracts, net of cash margin.
[6] 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 contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural contracts, fully offset by cash margin.
v3.21.1
Fair Value Measurements, Fair Value Measured On a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Nonaccruing Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross charge-offs against allowance for loan losses $ 15,049 $ 15,789
Net losses (gains) and expenses of repossessed assets, net 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
Net losses (gains) and expenses of repossessed assets, net 2,200 226
Fair Value, Inputs, Level 1 [Member] | Nonaccruing Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 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
Fair Value, Inputs, Level 2 [Member] | Nonaccruing Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 259 293
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 1,706 1,066
Fair Value, Inputs, Level 3 [Member] | Nonaccruing Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 34,046 22,746
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 $ 300 $ 400
v3.21.1
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
Mar. 31, 2021
Mar. 31, 2020
Nonaccruing Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 34,046 $ 22,746
Real estate and other repossessed assets [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 300 400
Discounted Cash Flow [Member] | Nonaccruing Loans [Member] | Management knowledge of Industry [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure 34,046 22,746
Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Management knowledge of Industry [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 300  
Appraised Value, as Adjusted [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   $ 400
Minimum [Member] | Nonaccruing Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance 10.00% [1] 6.00% [2]
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.   87.00%
Maximum [Member] | Nonaccruing Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance 91.00% [1] 71.00% [2]
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.   87.00%
Weighted Average [Member] | Nonaccruing Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance 47.00% [1] 36.00% [2]
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.   87.00%
[1] Represents fair value as a percentage of the unpaid principal balance.
[2] Represents fair value as a percentage of the unpaid principal balance.
v3.21.1
Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities $ 5,085,949 $ 4,707,975    
Investment Securities, Gross Amortized Cost 226,738 245,531    
Investment securities, Allowance for Credit Loss (617) (688)    
Investment securities, net of allowance 226,121 244,843    
Available for sale securities 13,410,057 13,050,665    
Fair value option securities 72,498 114,982    
Residential mortgage loans held for sale 284,447 252,316    
Loans and Leases Receivable, Gross 22,533,847 23,007,520    
Allowance for loan losses (352,402) (388,640)    
Loans, net of allowance 22,181,445 22,618,880    
Mortgage servicing rights 132,915 101,172 $ 110,828 $ 201,886
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Time deposits 2,004,356 1,967,128    
Subordinated debentures 276,024 276,005    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,657,784 13,077,535    
Allowance for loan losses (231,372) (254,934)    
Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,503,347 4,698,538    
Allowance for loan losses (81,746) (86,558)    
Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,848,550 1,682,310    
Allowance for loan losses 0 0    
Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,524,166 3,549,137    
Allowance for loan losses (39,284) (47,148)    
U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 33,613 9,183    
Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 8,477 8,913    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 216,047 229,245    
Available for sale securities 245,657 167,979    
U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 506 508    
Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 31,382 32,770    
Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 3,426,727 3,508,465    
Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
Investment Securities, Gross Amortized Cost 2,214 7,373    
Available for sale securities 471 472    
Carrying (Reported) Amount, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 723,983 798,757    
Interest-bearing cash and cash equivalents 695,213 381,816    
Trading securities 5,085,949 4,707,975    
Investment Securities, Gross Amortized Cost 226,738 245,531    
Investment securities, Allowance for Credit Loss (617) (688)    
Investment securities, net of allowance 226,121 244,843    
Available for sale securities 13,410,057 13,050,665    
Residential mortgage loans held for sale 284,447 252,316    
Loans and Leases Receivable, Gross 22,533,847 23,007,520    
Allowance for loan losses (352,402) (388,640)    
Loans, net of allowance 22,181,445 22,618,880    
Mortgage servicing rights 132,915 101,172    
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Deposits with no stated maturity 35,848,270 34,176,752    
Time deposits 2,004,356 1,967,128    
Other borrowed funds 2,503,678 3,545,356    
Subordinated debentures 276,024 276,005    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,657,784 13,077,535    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,503,347 4,698,538    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,848,550 1,682,310    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,524,166 3,549,137    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 33,613 9,183    
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 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 8,477 8,913    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 216,047 229,245    
Available for sale securities 245,657 167,979    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
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 506 508    
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 31,382 32,770    
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 3,426,727 3,508,465    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 2,214 7,373    
Available for sale securities 471 472    
Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 723,983 798,757    
Interest-bearing cash and cash equivalents 695,213 381,816    
Trading securities 5,085,949 4,707,975    
Investment Securities, Gross Amortized Cost 252,707 272,431    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 252,707 272,431    
Available for sale securities 13,410,057 13,050,665    
Residential mortgage loans held for sale 284,447 252,316    
Loans and Leases Receivable, Gross 22,331,508 22,885,806    
Allowance for loan losses 0 0    
Loans, net of allowance 22,331,508 22,885,806    
Mortgage servicing rights 132,915 101,172    
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Deposits with no stated maturity 35,848,270 34,176,752    
Time deposits 2,008,294 1,976,936    
Other borrowed funds 2,500,771 3,542,489    
Subordinated debentures 288,109 269,544    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,546,069 13,003,383    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,435,740 4,649,763    
Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,820,749 1,669,461    
Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,528,950 3,563,199    
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 33,613 9,183    
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 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 9,216 9,790    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 241,278 255,270    
Available for sale securities 245,657 167,979    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
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 506 508    
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 31,382 32,770    
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 3,426,727 3,508,465    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 2,213 7,371    
Available for sale securities 471 472    
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 723,983 798,757    
Interest-bearing cash and cash equivalents 695,213 381,816    
Trading securities 2,070 4,999    
Investment Securities, Gross Amortized Cost 0 0    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 0 0    
Available for sale securities 506 508    
Residential mortgage loans held for sale 0 0    
Loans and Leases Receivable, Gross 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 2,772 10,780    
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 2,721 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 and Leases Receivable, Gross 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 and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 2,070 4,999    
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, Gross Amortized Cost 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 securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 0 0    
Available for sale 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 506 508    
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, Gross Amortized Cost 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 5,083,879 4,702,976    
Investment Securities, Gross Amortized Cost 78,939 86,565    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 78,939 86,565    
Available for sale securities 13,409,080 13,049,685    
Residential mortgage loans held for sale 279,151 245,299    
Loans and Leases Receivable, Gross 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 1,286,384 799,908    
Deposits with no stated maturity 0 0    
Time deposits 0 0    
Other borrowed funds 0 0    
Subordinated debentures 288,109 269,544    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 716,835 405,779    
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 and Leases Receivable, Gross 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 and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 31,543 4,184    
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 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 9,216 9,790    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 67,510 69,404    
Available for sale securities 245,657 167,979    
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 22,126 10,472    
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, 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 31,382 32,770    
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 3,426,727 3,508,465    
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, Gross Amortized Cost 2,213 7,371    
Available for sale securities 0 0    
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, Gross Amortized Cost 173,768 185,866    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 173,768 185,866    
Available for sale securities 471 472    
Residential mortgage loans held for sale 5,296 7,017    
Loans and Leases Receivable, Gross 22,331,508 22,885,806    
Allowance for loan losses 0 0    
Loans, net of allowance 22,331,508 22,885,806    
Mortgage servicing rights 132,915 101,172    
Derviative contracts, net of cash collateral, Assets, Fair value 0 0    
Deposits with no stated maturity 35,848,270 34,176,752    
Time deposits 2,008,294 1,976,936    
Other borrowed funds 2,500,771 3,542,489    
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 and Leases Receivable, Gross 12,546,069 13,003,383    
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 and Leases Receivable, Gross 4,435,740 4,649,763    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,820,749 1,669,461    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,528,950 3,563,199    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [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, Gross Amortized Cost 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 securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 173,768 185,866    
Available for sale 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, 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, Gross Amortized Cost 0 0    
Available for sale securities $ 471 $ 472