215,962

203,512

620,084

618,634

Net interest income after provision for loan losses

3,101

10,963

141,593

35,232

212,861

192,549

478,491

583,402

NON-INTEREST INCOME

Bank card transaction fees

37,873

44,510

111,818

126,800

Trust fee revenue

40,769

39,592

118,676

115,223

Deposit fee revenue

23,107

24,032

69,063

71,009

Capital market fees

3,194

1,787

10,756

5,610

Consumer brokerage services

4,011

4,030

11,099

11,665

Loan fees and sales

9,769

4,755

17,653

12,302

Other

10,849

14,037

31,685

38,633

Total non-interest income

129,572

132,743

370,750

381,242

INVESTMENT SECURITIES GAINS (LOSSES), NET

Salaries and employee benefits

16,155

4,909

(1,275)

^[1]

3,874

^[1]

NON-INTEREST EXPENSE

127,308

123,836

383,004

366,026

Net occupancy

12,058

12,293

35,075

34,939

Equipment

4,737

4,941

14,313

14,202

Supplies and communication

4,141

5,106

13,226

15,543

Data processing and software

23,610

23,457

71,002

68,965

Marketing

4,926

6,048

14,706

17,963

Other

14,078

15,339

40,742

54,586

Total non-interest expense

190,858

191,020

572,068

572,224

Less non-controlling interest expense (income)

167,730

139,181

275,898

396,294

Less income taxes

34,375

29,101

54,209

80,860

Net income

133,355

110,080

221,689

315,434

838

(2,479)

1,083

Net income attributable to Commerce Bancshares, Inc.

132,448

109,242

224,168

314,351

Preferred Stock Dividends

7,466

2,250

11,966

6,750

Net Income (Loss) Available to Common Stockholders

$ 124,982

$ 106,992

$ 212,202

$ 307,601

Net income per common share — basic

$ 1.12

$ 0.93

$ 1.90

$ 2.65

Net income per common share — diluted

$ 1.11

$ 0.93

$ 1.89

$ 2.65

[1]	Available for sale debt securities, equity securities, and other securities.

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 133,355	$ 110,080	$ 221,689	$ 315,434
Other comprehensive income (loss)
Net unrealized gains (losses) on securities for which a portion of an other-than-temporary impairment has been recorded in earnings	0	(245)	0	(432)
Net unrealized gains (losses) on other securities	330	21,030	165,464	171,421
Pension loss amortization	327	389	1,038	1,166
Unrealized gains (losses) on cash flow hedge derivatives	(6,483)	14,101	66,489	36,687
Other comprehensive income (loss), net of tax	(5,826)	35,275	232,991	208,842
Comprehensive income	127,529	145,355	454,680	524,276
Non-controlling interest expense (income)	907	838	(2,479)	1,083
Comprehensive income attributable to Commerce Bancshares, Inc	$ 126,622	$ 144,517	$ 457,159	$ 523,193

Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Stock [Member]	Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	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, Adjustment	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	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	Non-Controlling Interest [Member]	Non-Controlling Interest [Member] Cumulative Effect, Period of Adoption, Adjusted Balance
Balance at Dec. 31, 2018	$ 2,937,149			$ 144,784		$ 559,432		$ 2,084,824		$ 241,163			$ (34,236)		$ (64,669)		$ 5,851
Net income	315,434									314,351							1,083
Other comprehensive income (loss)	208,842														208,842
Distributions to non-controlling interest	(3,520)																(3,520)
Purchase of treasury stock	(119,970)												(119,970)
Accelerated Share Repurchase Program, Adjustment	(150,000)							(37,500)					(112,500)
Issuance of stock, under purchase and equity compensation plans	(3)							(15,046)					15,043
Stock-based compensation	10,365							10,365
Cash dividends per share, Common Stock, Cash	(85,533)									(85,533)
Dividends per share, Preferred Stock, Cash	(6,750)									(6,750)
Balance at Sep. 30, 2019	3,106,014			144,784		559,432		2,042,643		463,231			(251,663)		144,173		3,414
Balance at Jun. 30, 2019	3,171,363			144,784		559,432		2,077,491		384,232			(106,106)		108,898		2,632
Net income	110,080									109,242							838
Other comprehensive income (loss)	35,275														35,275
Distributions to non-controlling interest	(56)																(56)
Purchase of treasury stock	(33,891)												(33,891)
Accelerated Share Repurchase Program, Adjustment	(150,000)							(37,500)					(112,500)
Issuance of stock, under purchase and equity compensation plans	0							(834)					834
Stock-based compensation	3,486							3,486
Cash dividends per share, Common Stock, Cash	(27,993)									(27,993)
Dividends per share, Preferred Stock, Cash	(2,250)									(2,250)
Balance at Sep. 30, 2019	3,106,014			144,784		559,432		2,042,643		463,231			(251,663)		144,173		3,414
Balance at Dec. 31, 2019	3,138,472	$ 3,766	$ 3,142,238	144,784	$ 144,784	563,978	$ 563,978	2,151,464	$ 2,151,464	201,562	$ 3,766	$ 205,328	(37,548)	$ (37,548)	110,444	$ 110,444	3,788	$ 3,788
Net income	221,689									224,168							(2,479)
Other comprehensive income (loss)	232,991														232,991
Distributions to non-controlling interest	(708)																(708)
Purchase of treasury stock	(53,760)												(53,760)
Redemption of preferred stock	(150,000)			(144,784)						(5,216)
Issuance of stock, under purchase and equity compensation plans	(27)							(22,285)					22,258
Stock-based compensation	11,231							11,231
Cash dividends per share, Common Stock, Cash	(90,640)									(90,640)
Dividends per share, Preferred Stock, Cash	(6,750)									(6,750)
Balance at Sep. 30, 2020	3,306,264			0		563,978		2,140,410		326,890			(69,050)		343,435		601
Balance at Jun. 30, 2020	3,358,169			144,784		563,978		2,136,874		232,082			(69,112)		349,261		302
Net income	133,355									132,448							907
Other comprehensive income (loss)	(5,826)														(5,826)
Distributions to non-controlling interest	(608)																(608)
Purchase of treasury stock	(167)												(167)
Redemption of preferred stock	(150,000)			(144,784)						(5,216)
Issuance of stock, under purchase and equity compensation plans	0							(229)					229
Stock-based compensation	3,765							3,765
Cash dividends per share, Common Stock, Cash	(30,174)									(30,174)
Dividends per share, Preferred Stock, Cash	(2,250)									(2,250)
Balance at Sep. 30, 2020	$ 3,306,264			$ 0		$ 563,978		$ 2,140,410		$ 326,890			$ (69,050)		$ 343,435		$ 601

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.270	$ 0.248	$ 0.810	$ 0.744
Preferred Stock, Dividends, per share, cash paid	$ 0.375	$ 0.375	$ 1.125	$ 1.125

Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

OPERATING ACTIVITIES:

Net income

$ 221,689

$ 315,434

Adjustments to reconcile net income to net cash provided by operating activities:

Provision for depreciation and amortization

141,593

35,232

32,462

30,729

Amortization of investment security premiums, net

37,623

20,436

Investment securities (gains) losses, net

^[1]

1,275

(3,874)

Net gains on sales of loans held for sale

(8,267)

(7,881)

Origination of loans held for sale

(169,774)

(187,792)

Proceeds from sales and repayments of held for sale

152,825

194,344

Net (increase) decrease in trading securities

5,636

(428)

Stock-based compensation

11,231

10,365

(Increase) decrease in interest receivable

(11,012)

229

Increase (decrease) in interest payable

(7,670)

5,938

Increase (decrease) in income taxes payable

(7,942)

23,530

Other changes, net

72,714

(58,928)

Net cash provided by (used in) operating activities

472,383

377,334

INVESTING ACTIVITIES:

Proceeds from sales of investment securities (A)

^[1]

574,376

379,641

Proceeds from maturities/pay downs of investment securities (A)

^[1]

1,856,780

1,007,553

Purchases of investment securities

^[1]

(5,135,211)

(1,306,607)

Net (increase) decrease in loans

(1,710,009)

(357,438)

Payments for Securities Purchased under Agreements to Resell

0

(150,000)

Purchases of land, buildings and equipment

(29,192)

(29,441)

Sales of land, buildings and equipment

313

2,029

Net cash provided by (used in) investing activities

(4,442,943)

(454,263)

FINANCING ACTIVITIES:

Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits

5,138,314

(230,229)

Net increase (decrease) in certificates of deposit

(17,565)

411,098

Net decrease in federal funds purchased and securities sold under agreements to repurchase

(197,708)

(315,115)

Repayment of long-term borrowings

0

(163)

Net increase (decrease) in short-term borrowings

(1,636)

248,734

Payments for Repurchase of Redeemable Preferred Stock

(150,000)

0

Purchases of treasury stock

(53,760)

(119,970)

Accelerated stock repurchase agreement

0

(150,000)

Issuance of stock under equity compensation plans

(27)

(3)

Cash dividends paid on common stock

(90,640)

(85,533)

Cash dividends paid on preferred stock

(6,750)

Net cash provided by (used in) financing activities

4,620,228

(247,931)

Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease)

649,668

(324,860)

Cash, cash equivalents and restricted cash at beginning of year

907,808

1,209,240

Cash, cash equivalents and restricted cash at September 30

1,557,476

884,380

Supplemental Cash Flow Information:

Income tax payments, net

58,750

54,161

Interest paid on deposits and borrowings

45,508

73,448

Loans transferred to foreclosed real estate

$ 57

$ 558

[1]	Available for sale debt securities, equity securities, and other securities.

Consolidated Statements Of Cash Flows Cash Flow Additional Information - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Restricted Cash and Cash Equivalents	$ 25.9	$ 25.1

Principles Of Consolidation And Presentation

9 Months Ended

Sep. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Principles Of Consolidation And Presentation

Principles of Consolidation and Presentation and Significant Accounting Policies

The accompanying consolidated financial statements include the accounts of Commerce Bancshares, Inc. and all majority-owned subsidiaries (the Company). Most of the Company's operations are conducted by its subsidiary bank, Commerce Bank (the Bank). The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, all adjustments necessary to present fairly the financial position and the results of operations for the interim periods have been made. All such adjustments are of a normal recurring nature. All significant intercompany accounts and transactions have been eliminated. Certain reclassifications were made to 2019 data to conform to current year presentation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Management has evaluated subsequent events for potential recognition or disclosure. The results of operations for the three and nine month periods ended September 30, 2020 are not necessarily indicative of results to be attained for the full year or any other interim period.

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission. Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Company's most recent Annual Report on Form 10-K, containing the latest audited consolidated financial statements and notes thereto.

On January 1, 2020, the Company adopted several FASB Accounting Standards Updates (ASUs). The Company's adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and its related amendments, resulted in changes to former accounting policies as described in Note 1 to the consolidated financial statements in the 2019 Annual Report on Form 10-K. Further discussion of the impact of adoption is included below, as well as in Note 2, Loans and Allowance for Credit Losses, and Note 3, Investment Securities. Significant accounting policies that were modified as a result of the adoption of ASU 2016-13 are included below.

The Company adopted ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and its related amendments on January 1, 2020. Known as the current expected credit loss (CECL), the standard replaced the incurred loss methodology. The new measurement approach requires the calculation of expected lifetime credit losses and is applied to financial assets measured at amortized cost, including loans and held-to-maturity securities, as well as certain off-balance sheet credit exposures such as unfunded lending commitments. The standard also changed the impairment model of available for sale debt securities.

The Company adopted CECL using the modified retrospective method for all financial assets measured at amortized cost and for unfunded lending commitments. Results for reporting periods beginning on or after January 1, 2020 are presented under CECL while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company recorded a net increase to retained earnings of $3.8 million as of January 1, 2020 for the cumulative effect of adopting CECL. The transition adjustment includes a decrease to the allowance for credit losses of $29.7 million related to the commercial loan portfolio, an increase to the allowance for credit losses of $8.7 million related to the personal banking loan portfolio, an increase to the liability for unfunded commitments of $16.1 million, and a tax impact of $1.2 million.

The table below illustrates the adoption impact of ASU 2016-13 on the Company's allowance for credit losses.


	December 31, 2019		January 1, 2020
(In thousands)	Allowance for loan losses ending balance		CECL Adjustment		Allowance for credit losses beginning balance
Commercial:
Business	$	44,268	$	(6,328)	$	37,940
Real estate - construction and land	21,589		(12,385)		9,204
Real estate - business	25,903		(10,998)		14,905
Total Commercial:	91,760		(29,711)		62,049
Personal Banking:
Real estate - personal	3,125		1,730		4,855
Consumer	15,932		(1,414)		14,518
Revolving home equity	638		986		1,624
Consumer credit card	47,997		8,498		56,495
Overdrafts	1,230		(1,128)		102
Total Personal Banking:	68,922		8,672		77,594
Allowance for credit losses on loans	160,682		(21,039)		139,643
Liability for unfunded lending commitments	1,075		16,090		17,165
Total allowance for credit losses	$	161,757	$	(4,949)	$	156,808

The following significant accounting policies have been updated since the Company's 2019 Annual Report on Form 10-K to reflect the adoption of ASU 2016-13.

Loans and Related Earnings

The Company's portfolio of held-for-investment loans includes a net investment in direct financing and sales type leases to commercial and industrial and tax-exempt entities, and collectively, the Company's portfolio of loans and leases is referred to as its "loan portfolio" or "loans". Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at amortized cost, excluding accrued interest receivable. Amortized cost is the outstanding principal balance, net of any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the interest method. Loans are presented net of the allowance for credit losses on loans.

Interest on loans is accrued based upon the principal amount outstanding. The Company has elected the practical expedient to exclude all accrued interest receivable from all required disclosures of amortized cost. Additionally, an election was made not to measure an allowance for credit losses for accrued interest receivables. The Company has also made the election that all interest accrued but not received is reversed against interest income.

Loan and commitment fees, net of costs, are deferred and recognized in income over the term of the loan or commitment as an adjustment of yield. Annual fees charged on credit card loans are capitalized to principal and amortized over 12 months to loan fees and sales. Other credit card fees, such as cash advance fees and late payment fees, are recognized in income as an adjustment of yield when charged to the cardholder’s account.

Past Due Loans

Management reports loans as past due on the day following the contractual repayment date if payment was not received by end of the business day. Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for credit losses on loans, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction and land real estate, and personal real estate loans are generally charged down to estimated collectible balances when they are placed on non-accrual status. Consumer loans and related accrued interest are normally charged down to the fair value of related collateral (or are charged off in full if not collateralized) once the loans are more than 120 to 180 days delinquent, depending on the type of loan. Revolving home equity loans are charged down to the fair value of the related collateral once the loans are more than 180 days past due. Credit card loans are charged off against the allowance for credit losses when the receivable is more than 180 days past due.

Troubled Debt Restructurings

A loan is accounted for as a troubled debt restructuring if the Company, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. A troubled debt restructuring typically involves (1) modification of terms such as a reduction of the stated interest rate, loan principal, or accrued interest, (2) a loan renewal at a stated interest rate lower than the current market rate for a new loan with similar risk, or (3) debt that was not reaffirmed in bankruptcy. Business, business real estate, construction and land real estate and personal real estate troubled debt restructurings with impairment charges are placed on non-accrual status. The Company measures the impairment loss of a troubled debt restructuring at the time of modification based on the present value of expected future cash flows. Subsequent to modification, troubled debt restructurings are subject to the Company’s allowance for credit loss model, which is discussed below and in Note 2, Loans and Allowance for Credit Losses. Troubled debt restructurings that are performing under their contractual terms continue to accrue interest, which is recognized in current earnings.

Section 4013 of the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was signed into law on March 27, 2020 and provides financial institutions the option to suspend the requirement to categorize certain modifications related to the global Coronavirus Disease 2019 (COVID-19) pandemic as troubled debt restructurings. Additionally, bank regulatory agencies issued additional guidance on implementing the provisions of the CARES Act. The Company follows the guidance under the CARES Act. Refer to Note 2 for additional information.

Allowance for Credit Losses on Loans

The allowance for credit losses on loans is a valuation amount that is deducted from the amortized cost basis of loans not held at fair value to present the net amount expected to be collected over the contractual term of the loans. The allowance for credit losses on loans is measured using relevant information about past events, including historical credit loss experience on loans with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the loans. An allowance will be created upon origination or acquisition of a loan and is updated at subsequent reporting dates. The methodology is applied consistently for each reporting period and reflects management’s current expectations of credit losses. Changes to the allowance for credit losses on loans resulting from periodic evaluations are recorded through increases or decreases to the credit loss expense for loans, which is recorded in provision for credit losses on the consolidated statements of income. Loans that are deemed to be uncollectible are charged off against the related allowance for credit losses on loans.

The allowance for credit losses on loans is measured on a collective (pool) basis. Loans are aggregated into pools based on similar risk characteristics including borrower type, collateral type and expected credit loss patterns. The allowance for credit losses on a troubled debt restructuring which continues to accrue interest is also measured on a collective basis. Loans that do not share similar risk characteristics, primarily large loans on non-accrual status, are evaluated on an individual basis. The allowance related to these large non-accrual loans is measured using the fair value of the collateral (less selling cost, if applicable) as most of these loans are collateral dependent and the borrower is facing financial difficulty.

As noted above, the allowance for credit losses on loans does not include an allowance for accrued interest.

Liability for Unfunded Lending Commitments

The Company’s unfunded lending commitments are primarily unfunded loan commitments and letters of credit. Expected credit losses for these unfunded lending commitments are calculated over the contractual period during which the Company is exposed to the credit risk. The methodology used to measure credit losses for unfunded lending commitments is the same as the methodology used for loans, however, the estimate of credit risk for unfunded lending commitments takes into consideration the likelihood that funding will occur. The liability for unfunded lending commitments excludes any exposures that are unconditionally cancellable by the Company. The loss estimate is recorded within other liabilities on the consolidated balance sheet. Changes to the liability for unfunded lending commitments are recorded through increases or decreases to the provision for credit losses on the consolidated statements of income.

Investments in Debt and Equity Securities

The majority of the Company's investment portfolio is comprised of debt securities that are classified as available for sale. From time to time, the Company sells securities and utilizes the proceeds to reduce borrowings, fund loan growth, or modify its interest rate profile. Securities classified as available for sale are carried at fair value. Changes in fair value are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for credit losses in accordance with the guidance provided in ASC 326. Further discussion of this evaluation is provided in "Allowance for Credit Losses on Available for Sale Debt Securities" below. Gains and losses realized upon sales of securities are calculated using the specific identification method and are included in investment securities gains (losses), net, in the consolidated statements of income. Purchase premiums and discounts are amortized to interest income using a level yield method over the

estimated lives of the securities. For certain callable debt securities purchased at a premium, the amortization is instead recorded to the earliest call date. For mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine if a change in a bond's estimated remaining life is necessary. A corresponding adjustment is then made in the related amortization of premium or discount accretion.

Accrued interest receivable on available for sale debt securities is reported in other assets on the consolidated balance sheet. The Company has elected the practical expedient to exclude the accrued interest from all required disclosures of amortized cost. Additionally, an election was made not to measure an allowance for credit losses for accrued interest receivables. Interest accrued but not received is reversed against interest income.

Equity securities include common and preferred stock with readily determinable fair values. These are also carried at fair value. Certain equity securities do not have readily determinable fair values. The Company has elected under ASU 2016-01 to measure these equity securities without a readily determinable fair value at cost minus impairment, if any, plus or minus changes resulting from observable price changes for the identical or similar investment of the same issuer. The Company has not recorded any impairment or other adjustments to the carrying amount of these equity investments without readily determinable fair values.

Other securities include Federal Reserve Bank stock and Federal Home Loan Bank stock, which are held for debt and regulatory purposes. They are carried at cost and periodically evaluated for impairment. Also included are investments in portfolio concerns held by the Company’s private equity subsidiaries, which consist of both debt and equity instruments. Private equity investments are carried at fair value in accordance with ASC 946-10-15, with changes in fair value reported in current earnings. In the absence of readily ascertainable market values, fair value is estimated using internally developed methods. Changes in fair value which are recognized in current earnings and gains and losses from sales are included in investment securities gains (losses), net in the consolidated statements of income.

Trading account securities, which are debt securities bought and held principally for the purpose of resale in the near term, are carried at fair value. Gains and losses, both realized and unrealized, are recorded in non-interest income.

Purchases and sales of securities are recognized on a trade date basis. A receivable or payable is recognized for pending transaction settlements.

Allowance for Credit Losses on Available for Sale Debt Securities

For available for sale debt securities in an unrealized loss position, the entire loss in fair value is required to be recognized in current earnings if the Company intends to sell the securities or believes it more likely than not that it will be required to sell the security before the anticipated recovery. If neither condition is met, and the Company does not expect to recover the amortized cost basis, the Company determines whether the decline in fair value resulted from credit losses or other factors. If the assessment indicates that a credit loss exists, the present value of cash flows expected to be collected is compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss has occurred, and an allowance for credit losses is recorded. The allowance for credit losses is limited by the amount that the fair value is less than the amortized cost basis. Any impairment not recorded through the provision for credit losses is recognized in other comprehensive income.

Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit losses on the consolidated statements of income. Losses are charged against the allowance for credit losses on securities when management believes the uncollectibility of an available for sale security is confirmed or when either of the conditions regarding intent or requirement to sell is met.

Accrued interest receivable on available for sale debt securities is excluded from the estimate of credit losses.

Loans And Allowance For Credit Losses

9 Months Ended

Sep. 30, 2020

Loans And Allowance For Credit Losses [Abstract]

Loans And Allowance For Credit Losses

Loans and Allowance for Credit Losses

Major classifications within the Company’s held for investment loan portfolio at September 30, 2020 and December 31, 2019 are as follows:


(In thousands)	September 30, 2020		December 31, 2019
Commercial:
Business	$	6,683,413	$	5,565,449
Real estate – construction and land	1,009,729		899,377
Real estate – business	2,993,192		2,833,554
Personal Banking:
Real estate – personal	2,753,867		2,354,760
Consumer	2,006,360		1,964,145
Revolving home equity	324,203		349,251
Consumer credit card	647,893		764,977
Overdrafts	2,270		6,304
Total loans (1)	$	16,420,927	$	14,737,817

(1) Accrued interest receivable totaled $41.3 million at September 30, 2020 and was included within other assets on the consolidated balance sheet. For the three months ended September 30, 2020, the Company wrote-off accrued interest by reversing interest income of $89 thousand and $1.7 million in the Commercial and Personal Banking portfolios, respectively. Similarly, for the nine months ended September 30, 2020, the Company wrote-off accrued interest of $258 thousand and $4.4 million in the Commercial and Personal Banking portfolios, respectively.

At September 30, 2020, loans of $4.1 billion were pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $1.5 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings.

Allowance for credit losses

The allowance for credit losses is measured using an average historical loss model which incorporates relevant information about past events, including historical credit loss experience on loans with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the loans. The allowance for credit losses is measured on a collective (pool) basis. Loans are aggregated into pools based on similar risk characteristics including borrower type, collateral type and expected credit loss patterns. Loans that do not share similar risk characteristics, primarily large loans on non-accrual status, are evaluated on an individual basis.

For loans evaluated for credit losses on a collective basis, average historical loss rates are calculated for each pool using the Company’s historical net charge-offs (combined charge-offs and recoveries by observable historical reporting period) and outstanding loan balances during a lookback period. Lookback periods can be different based on the individual pool and represent management’s credit expectations for the pool of loans over the remaining contractual life. In certain loan pools, if the Company’s own historical loss rate is not reflective of the loss expectations, the historical loss rate is augmented by industry and peer data. The calculated average net charge-off rate is then adjusted for current conditions and reasonable and supportable forecasts. These adjustments increase or decrease the average historical loss rate to reflect expectations of future losses given a single path economic forecast of key macroeconomic variables including GDP, disposable income, unemployment rate, various interest rates, CPI inflation rate, HPI, CREPI and market volatility. The adjustments are based on results from various regression models projecting the impact of the macroeconomic variables to loss rates. The forecast is used for a reasonable and supportable period before reverting back to historical averages using a straight-line method. The forecast adjusted loss rate is applied to the loans over the remaining contractual lives, adjusted for expected prepayments. The contractual term excludes expected extensions (except for contractual extensions at the option of the customer), renewals and modifications unless there is a reasonable expectation that a troubled debt restructuring will be executed. Credit cards and certain similar consumer lines of credit do not have stated maturities and therefore, for these loan classes, remaining contractual lives are determined by estimating future cash flows expected to be received from customers until payments have been fully allocated to outstanding balances. Additionally, the allowance for credit losses considers other qualitative factors not included in historical loss rates or macroeconomic forecast such as changes in portfolio composition, underwriting practices, or significant unique events or conditions.

Key model assumptions in the Company’s allowance for credit loss model include the economic forecast, the reasonable and supportable period, prepayment assumptions and qualitative factors applied for portfolio composition changes, underwriting practices, or significant unique events or conditions. The assumptions utilized in estimating the Company’s allowance for credit losses at September 30, 2020 and June 30, 2020 are discussed below.


Key Assumption	September 30, 2020	June 30, 2020

Overall economic forecast	•The recovery from the Global Coronavirus Recession (GCR) continues to be gradual •Assumes no additional systemic lockdown measures •Gradual recovery in late 2021 and into 2022 •Significant uncertainty regarding the pandemic and its impact on economy	•The recovery from the Global Coronavirus Recession (GCR) is gradual •Assumes no second wave of contagion and states continue to loosen lockdown measures •Gradual recovery in late 2021 and into 2022 •Significant uncertainty regarding the pandemic and its impact on economy
Reasonable and supportable period and related reversion period	•Two years for both commercial and personal banking loans •Reversion to historical average loss rates within two quarters using a straight-line method	•Two years for both commercial and personal banking loans •Reversion to historical average loss rates within two quarters using a straight-line method
Forecasted macro-economic variables	•Unemployment rate ranging from 8.8% to 5.3% during the supportable forecast period •Real GDP growth ranges from 4.4% to 2.4% •Prime rate of 3.25%	•Unemployment rate ranging from 10.9% to 5.7% during the supportable forecast period •Real GDP growth ranges from 3.0% to 25.7% •Prime rate of 3.25%
Prepayment assumptions	Commercial loans •5% for most loan pools Personal banking loans •Ranging from 21.6% to 23.5% for most loan pools •58.0% for consumer credit cards	Commercial loans •5% for most loan pools Personal banking loans •Ranging from 18.7% to 23.3% for most loan pools •58.0% for consumer credit cards
Qualitative factors	Added net reserves using qualitative processes related to: •Loans originated in our recent expansion markets, loans that are designated as shared national credits, and certain COVID-19 deferral program loans. •Changes in the composition of the loan portfolios •Loans downgraded to special mention, substandard, or non-accrual status	Added net reserves using qualitative processes related to: •Loans originated in our recent expansion markets and loans that are designated as shared national credits •Changes in the composition of the loan portfolios •Loans downgraded to special mention, substandard, or non-accrual status

The liability for unfunded lending commitments utilizes the same model as the allowance for credit losses on loans, however, the liability for unfunded lending commitments incorporates an assumption for the portion of unfunded commitments that are expected to be funded.

Sensitivity in the Allowance for Credit Loss model

The allowance for credit losses is an estimate that requires significant judgment including projections of the macro-economic environment. The forecasted macro-economic environment continuously changes which can cause fluctuations in estimated expected losses.

The current forecast projects a sharp recession with a recovery in the next two years as a result of the COVID-19 outbreak. This pandemic is unprecedented and information that could be used in the estimation of the allowance for credit losses changes frequently. Events such as the timing of governmental required business lock downs or possible additional waves of infection could prolong and deepen the projected recession.

A summary of the activity in the allowance for credit losses on loans and the liability for unfunded lending commitments during the three and nine months ended September 30, 2020 follows:


	For the Three Months Ended September 30						For the Nine Months Ended September 30
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
ALLOWANCE FOR CREDIT LOSSES ON LOANS
Balance at end of prior period	$	130,553	$	110,191	$	240,744	$	91,760	$	68,922	$	160,682
Adoption of ASU 2016-13	—		—		—		(29,711)		8,672		(21,039)
Balance at beginning of period	$	130,553	$	110,191	$	240,744	$	62,049	$	77,594	$	139,643
Provision for credit losses on loans	(1,935)		5,135		3,200		69,418		54,141		123,559
Deductions:
Loans charged off	357		10,292		10,649		4,159		32,127		36,286
Less recoveries on loans	163		2,902		3,065		1,116		8,328		9,444
Net loan charge-offs	194		7,390		7,584		3,043		23,799		26,842
Balance September 30, 2020	$	128,424	$	107,936	$	236,360	$	128,424	$	107,936	$	236,360
LIABILITY FOR UNFUNDED LENDING COMMITMENTS
Balance at end of prior period	$	34,052	$	1,247	$	35,299	$	399	$	676	$	1,075
Adoption of ASU 2016-13	—		—		—		16,057		33		16,090
Balance at beginning of period	$	34,052	$	1,247	$	35,299	$	16,456	$	709	$	17,165
Provision for credit losses on unfunded lending commitments	(60)		(39)		(99)		17,536		499		18,035
Balance September 30, 2020	$	33,992	$	1,208	$	35,200	$	33,992	$	1,208	$	35,200
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$	162,416	$	109,144	$	271,560	$	162,416	$	109,144	$	271,560

Allowance for loan losses

A summary of the activity in the allowance for loan losses during the three and nine months ended September 30, 2019 follows:


	For the Three Months Ended September 30						For the Nine Months Ended September 30
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
Balance at beginning of period	$	91,808	$	69,374	$	161,182	$	92,869	$	67,063	$	159,932

Provision for loan losses	553		10,410		10,963		55		35,177		35,232
Deductions:
Loans charged off	490		13,990		14,480		1,436		42,233		43,669
Less recoveries on loans	199		2,818		3,017		582		8,605		9,187
Net loan charge-offs	291		11,172		11,463		854		33,628		34,482
Balance September 30, 2019	$	92,070	$	68,612	$	160,682	$	92,070	$	68,612	$	160,682

Delinquent and non-accrual loans

The Company considers loans past due on the day following the contractual repayment date, if the contractual repayment was not received by the Company as of the end of the business day. The following table provides aging information on the Company’s past due and accruing loans, in addition to the balances of loans on non-accrual status, at September 30, 2020 and December 31, 2019.


(In thousands)	Current or Less Than 30 Days Past Due		30 – 89 Days Past Due		90 Days Past Due and Still Accruing		Non-accrual		Total
September 30, 2020
Commercial:
Business	$	6,636,383	$	7,106	$	2,629	$	37,295	$	6,683,413
Real estate – construction and land	991,404		18,320		4		1		1,009,729
Real estate – business	2,987,992		4,137		—		1,063		2,993,192
Personal Banking:
Real estate – personal	2,743,260		6,029		2,667		1,911		2,753,867
Consumer	1,983,820		20,329		2,211		—		2,006,360
Revolving home equity	322,572		1,237		394		—		324,203
Consumer credit card	629,181		12,181		6,531		—		647,893
Overdrafts	2,080		190		—		—		2,270
Total	$	16,296,692	$	69,529	$	14,436	$	40,270	$	16,420,927
December 31, 2019
Commercial:
Business	$	5,545,104	$	12,064	$	792	$	7,489	$	5,565,449
Real estate – construction and land	882,826		13,046		3,503		2		899,377
Real estate – business	2,830,494		2,030		—		1,030		2,833,554
Personal Banking:
Real estate – personal	2,345,243		6,129		1,689		1,699		2,354,760
Consumer	1,928,082		34,053		2,010		—		1,964,145
Revolving home equity	347,258		1,743		250		—		349,251
Consumer credit card	742,659		10,703		11,615		—		764,977
Overdrafts	5,972		332		—		—		6,304
Total	$	14,627,638	$	80,100	$	19,859	$	10,220	$	14,737,817

At September 30, 2020, the Company had $20.6 million of non-accrual business loans that had no allowance for credit loss. The Company did not record any interest income on non-accrual loans during the three and nine months ended September 30, 2020.

Credit quality indicators

The following table provides information about the credit quality of the Commercial loan portfolio. The Company utilizes an internal risk rating system comprised of a series of grades to categorize loans according to perceived risk associated with the expectation of debt repayment based on borrower specific information including but not limited to current financial information, historical payment experience, industry information, collateral levels and collateral types. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. A loan is assigned the risk rating at origination and then monitored throughout the contractual term for possible risk rating changes. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is applied to loans where the borrower exhibits negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment.

All loans are analyzed for risk rating updates annually. For larger loans, rating assessments may be more frequent if relevant information is obtained earlier through debt covenant monitoring or overall relationship management. Smaller loans are monitored as identified by the loan officer based on the risk profile of the individual borrower or if the loan becomes past

due related to credit issues. Loans rated Special Mention, Substandard or Non-accrual are subject to quarterly review and monitoring processes. In addition to the regular monitoring performed by the lending personnel and credit committees, loans are subject to review by a credit review department which verifies the appropriateness of the risk ratings for the loans chosen as part of its risk-based review plan.

The risk category of loans in the Commercial portfolio as of September 30, 2020 are as follows:


	Term Loans Amortized Cost Basis by Origination Year
(In thousands)	2020		2019		2018		2017		2016		Prior		Revolving Loans Amortized Cost Basis		Total
Business
Risk Rating:
Pass	$	2,394,434	$	1,097,498	$	518,966	$	356,416	$	186,992	$	307,681	$	1,535,511	$	6,397,498
Special mention	29,620		28,518		17,532		1,120		5,773		1,843		63,973		148,379
Substandard	16,118		26,401		2,139		2,849		3,608		13,879		35,247		100,241
Non-accrual	19,948		—		2,065		16		125		3,845		11,296		37,295
Total Business:	$	2,460,120	$	1,152,417	$	540,702	$	360,401	$	196,498	$	327,248	$	1,646,027	$	6,683,413
Real estate-construction
Risk Rating:
Pass	$	407,465	$	323,632	$	131,606	$	49,040	$	24,660	$	682	$	32,865	$	969,950
Special mention	—		—		10,107		14,555		—		—		—		24,662
Substandard	1,354		—		593		13,169		—		—		—		15,116
Non-accrual	1		—		—		—		—		—		—		1
Total Real estate-construction:	$	408,820	$	323,632	$	142,306	$	76,764	$	24,660	$	682	$	32,865	$	1,009,729
Real estate- business
Risk Rating:
Pass	$	713,079	$	698,287	$	384,214	$	283,843	$	329,613	$	238,663	$	46,224	$	2,693,923
Special mention	24,660		11,959		45,547		6,943		20,837		1,285		2		111,233
Substandard	57,938		6,099		11,228		57,364		17,306		33,472		3,566		186,973
Non-accrual	1		285		624		—		—		153		—		1,063
Total Real-estate business:	$	795,678	$	716,630	$	441,613	$	348,150	$	367,756	$	273,573	$	49,792	$	2,993,192
Commercial loans
Risk Rating:
Pass	$	3,514,978	$	2,119,417	$	1,034,786	$	689,299	$	541,265	$	547,026	$	1,614,600	$	10,061,371
Special mention	54,280		40,477		73,186		22,618		26,610		3,128		63,975		284,274
Substandard	75,410		32,500		13,960		73,382		20,914		47,351		38,813		302,330
Non-accrual	19,950		285		2,689		16		125		3,998		11,296		38,359
Total Commercial loans:	$	3,664,618	$	2,192,679	$	1,124,621	$	785,315	$	588,914	$	601,503	$	1,728,684	$	10,686,334

Information about the credit quality of the Commercial loan portfolio as of December 31, 2019 follows:


Commercial Loans
(In thousands)	Business		Real Estate-Construction		Real Estate- Business		Total






December 31, 2019
Pass	$	5,393,928	$	856,364	$	2,659,827	$	8,910,119
Special mention	80,089		42,541		92,626		215,256
Substandard	83,943		470		80,071		164,484
Non-accrual	7,489		2		1,030		8,521
Total	$	5,565,449	$	899,377	$	2,833,554	$	9,298,380

The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided as of September 30, 2020 below:


	Term Loans Amortized Cost Basis by Origination Year
(In thousands)	2020		2019		2018		2017		2016		Prior		Revolving Loans Amortized Cost Basis		Total
Real estate-personal
Current to 90 days past due	$	897,007	$	532,003	$	238,092	$	227,499	$	247,754	$	595,713	$	11,221	$	2,749,289
Over 90 days past due	273		394		422		361		357		860		—		2,667
Non-accrual	—		195		129		45		121		1,421		—		1,911
Total Real estate-personal:	$	897,280	$	532,592	$	238,643	$	227,905	$	248,232	$	597,994	$	11,221	$	2,753,867
Consumer
Current to 90 days past due	$	446,909	$	380,399	$	188,186	$	137,253	$	90,236	$	104,466	$	656,700	$	2,004,149
Over 90 days past due	76		337		158		176		162		278		1,024		2,211

Total Consumer:	$	446,985	$	380,736	$	188,344	$	137,429	$	90,398	$	104,744	$	657,724	$	2,006,360
Revolving home equity
Current to 90 days past due	$	—	$	—	$	—	$	—	$	—	$	—	$	323,809	$	323,809
Over 90 days past due	—		—		—		—		—		—		394		394

Total Revolving home equity:	$	—	$	—	$	—	$	—	$	—	$	—	$	324,203	$	324,203
Consumer credit card
Current to 90 days past due	$	—	$	—	$	—	$	—	$	—	$	—	$	641,362	$	641,362
Over 90 days past due	—		—		—		—		—		—		6,531		6,531

Total Consumer credit card:	$	—	$	—	$	—	$	—	$	—	$	—	$	647,893	$	647,893
Overdrafts
Current to 90 days past due	$	2,270	$	—	$	—	$	—	$	—	$	—	$	—	$	2,270
Over 90 days past due	—		—		—		—		—		—		—		—

Total Overdrafts:	$	2,270	$	—	$	—	$	—	$	—	$	—	$	—	$	2,270
Personal banking loans
Current to 90 days past due	$	1,346,186	$	912,402	$	426,278	$	364,752	$	337,990	$	700,179	$	1,633,092	$	5,720,879
Over 90 days past due	349		731		580		537		519		1,138		7,949		11,803
Non-accrual	—		195		129		45		121		1,421		—		1,911
Total Personal banking loans:	$	1,346,535	$	913,328	$	426,987	$	365,334	$	338,630	$	702,738	$	1,641,041	$	5,734,593

Collateral-dependent loans

The Company's collateral-dependent loans are comprised of large loans on non-accrual status. The Company requires that collateral-dependent loans are either over-collateralized or carry collateral equal to the amortized cost of the loan. The following table presents the amortized cost basis of collateral-dependent loans as of September 30, 2020.


(In thousands)	Business Assets		Future Revenue Streams		Energy		Total
Commercial:
Business	$	18,843	$	3,616	$	14,276	$	36,734








Total	$	18,843	$	3,616	$	14,276	$	36,734

Other Personal Banking loan information

As noted above, the credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above section on "Credit quality indicators." In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a borrower's financial history and is considered supplementary information utilized by the Company, as management does not consider this information in evaluating the allowance for credit losses on loans. The Bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because the loans generally pertain to commercial customer activities and are often underwritten with other collateral considerations. These loans totaled $183.3 million at September 30, 2020 and $198.2 million at December 31, 2019. The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $193.2 million at September 30, 2020 and $199.2 million at December 31, 2019. As the healthcare loans are guaranteed by the hospital, customer FICO scores are not obtained for these loans. The personal real estate loans and consumer loans excluded below totaled less than 7% of the Personal Banking portfolio. For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at September 30, 2020 and December 31, 2019 by FICO score.


Personal Banking Loans
	% of Loan Category
	Real Estate - Personal		Consumer		Revolving Home Equity		Consumer Credit Card
September 30, 2020
FICO score:
Under 600	1.0	%	2.4	%	1.4	%	5.2	%
600 - 659	2.1		3.9		2.5		12.9
660 - 719	8.5		14.5		7.3		32.2
720 - 779	25.7		25.6		22.6		27.5
780 and over	62.7		53.6		66.2		22.2
Total	100.0	%	100.0	%	100.0	%	100.0	%
December 31, 2019
FICO score:
Under 600	1.0	%	3.0	%	1.7	%	5.6	%
600 - 659	1.9		5.2		1.9		14.3
660 - 719	9.2		15.4		9.0		32.2
720 - 779	25.7		27.0		21.5		26.6
780 and over	62.2		49.4		65.9		21.3
Total	100.0	%	100.0	%	100.0	%	100.0	%

Troubled debt restructurings

Restructured loans are those extended to borrowers who are experiencing financial difficulty and who have been granted a concession. Restructured loans are placed on non-accrual status if the Company does not believe it probable that amounts due under the contractual terms will be collected. Commercial performing restructured loans are primarily comprised of certain business, construction and business real estate loans classified as substandard but renewed at rates judged to be non-market. These loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. Troubled debt restructurings also include certain credit card and other small consumer loans under various debt management and assistance programs. Modifications to these loans generally involve removing the available line of credit, placing loans on amortizing status, and lowering the contractual interest rate. Certain personal real estate, revolving home equity, and consumer loans were classified as consumer bankruptcy troubled debt restructurings because they were not reaffirmed by the borrower in bankruptcy proceedings. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments. Other consumer loans classified as troubled debt restructurings consist of various other workout arrangements with consumer customers.

Section 4013 of the CARES Act was signed into law on March 27, 2020, and includes a provision that short-term modifications are not troubled debt restructurings, if made on a good-faith basis in response to COVID-19 to borrowers who were current prior to December 31, 2019. In addition to the CARES Act, bank regulatory agencies issued interagency guidance stating suspending the troubled debt restructuring classification would be appropriate if the borrower was less than 30 days past due at the time the modification program is implemented. The guidance also provides that loans generally will not be adversely classified if the short-term modification is related to COVID-19 relief programs. The Company follows the guidance under the CARES Act when determining if a customer’s modification is subject to troubled debt restructuring classification. If it is deemed the modification is not short-term, not COVID-19 related or the customer does not meet the criteria under the guidance to be scoped out of troubled debt restructuring classification, the Company will evaluate the loan modifications under its existing framework which requires modifications that result in a concession to a borrower experiencing financial difficulty be accounted for as a troubled debt restructuring.


(In thousands)		September 30, 2020		December 31, 2019
Accruing restructured loans:
	Commercial	$	50,921	$	55,934
	Assistance programs	8,208		8,365
	Consumer bankruptcy	3,101		3,592
	Other consumer	2,418		3,621
Non-accrual loans		8,513		7,938
Total troubled debt restructurings		$	73,161	$	79,450

The table below shows the balance of troubled debt restructurings by loan classification at September 30, 2020, in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal.


(In thousands)	September 30, 2020		Balance 90 days past due at any time during previous 12 months
Commercial:
Business	$	17,696	$	674
Real estate - construction and land	41		—
Real estate - business	40,596		—
Personal Banking:
Real estate - personal	3,278		252
Consumer	3,530		103
Revolving home equity	56		—
Consumer credit card	7,964		257
Total troubled debt restructurings	$	73,161	$	1,286

For those loans on non-accrual status also classified as restructured, the modification did not create any further financial effect on the Company as those loans were already recorded at net realizable value. For those performing commercial loans classified as restructured, there were no concessions involving forgiveness of principal or interest and, therefore, there was no financial impact to the Company as a result of modification to these loans. No financial impact resulted from those performing loans where the debt was not reaffirmed in bankruptcy, as no changes to loan terms occurred in that process. However, the effects of modifications to loans under various debt management and assistance programs were estimated to decrease interest income by approximately $1.1 million on an annual, pre-tax basis, compared to amounts contractually owed. Other modifications to consumer loans mainly involve extensions and other small modifications that did not include the forgiveness of principal or interest.

The allowance for credit losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. Those performing loans classified as troubled debt restructurings are accruing loans which management expects to collect under contractual terms. Performing commercial loans having no other concessions granted other than being renewed at non-market interest rates are judged to have similar risk characteristics as non-troubled debt commercial loans and are collectively evaluated based on internal risk rating, loan type, delinquency, historical experience and current economic factors. Performing personal banking loans classified as troubled debt restructurings resulted from the borrower not reaffirming the debt during bankruptcy and have had no other concession granted, other than the Bank's future limitations on collecting payment deficiencies or in pursuing foreclosure actions. As such, they have similar risk characteristics as non-troubled debt personal banking loans and are evaluated collectively based on loan type, delinquency, historical experience and current economic factors.

If a troubled debt restructuring defaults and is already on non-accrual status, the allowance for credit losses continues to be based on individual evaluation, using discounted expected cash flows or the fair value of collateral. If an accruing troubled debt restructuring defaults, the loan's risk rating is downgraded to non-accrual status and the loan's related allowance for credit losses is determined based on individual evaluation, or if necessary, the loan is charged off and collection efforts begun.

The Company had commitments of $13.1 million at September 30, 2020 to lend additional funds to borrowers with restructured loans.

Impaired loans

The following Impaired loans disclosures were superceded by ASC 2016-13.

The table below shows the Company’s balances of impaired loans at December 31, 2019. These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings. These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. They are discussed further in the "Troubled debt restructurings" section above.


(In thousands)	Dec. 31, 2019
Non-accrual loans	$	10,220
Restructured loans (accruing)	71,512
Total impaired loans	$	81,732

The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2019, disaggregated on the basis of impairment methodology. Impaired loans evaluated under Accounting Standards Codification (ASC) 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans deemed to have similar risk characteristics, which are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20.


	Impaired Loans				All Other Loans
(In thousands)	Allowance for Loan Losses		Loans Outstanding		Allowance for Loan Losses		Loans Outstanding
December 31, 2019
Commercial	$	1,629	$	64,500	$	90,131	$	9,233,880
Personal Banking	1,117		17,232		67,805		5,422,205
Total	$	2,746	$	81,732	$	157,936	$	14,656,085

The following table provides additional information about impaired loans held by the Company at December 31, 2019, segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided.


(In thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance



















December 31, 2019
With no related allowance recorded:
Business	$	7,054	$	13,738	$	—





	$	7,054	$	13,738	$	—
With an allowance recorded:
Business	$	30,437	$	30,487	$	837
Real estate – construction and land	46		51		1
Real estate – business	26,963		27,643		791
Real estate – personal	4,729		5,968		258
Consumer	4,421		4,421		35
Revolving home equity	35		35		1
Consumer credit card	8,047		8,047		823
	$	74,678	$	76,652	$	2,746
Total	$	81,732	$	90,390	$	2,746

Total average impaired loans for the three and nine month periods ended September 30, 2019 are shown in the table below.


(In thousands)	Commercial		Personal Banking		Total
Average Impaired Loans:








For the three months ended September 30, 2019
Non-accrual loans	$	9,655	$	1,903	$	11,558
Restructured loans (accruing)	53,517		15,644		69,161
Total	$	63,172	$	17,547	$	80,719
For the nine months ended September 30, 2019
Non-accrual loans	$	9,881	$	2,074	$	11,955
Restructured loans (accruing)	48,248		15,605		63,853
Total	$	58,129	$	17,679	$	75,808

The table below shows interest income recognized during the three and nine month periods ended September 30, 2019, respectively, for impaired loans held at the end of each period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section above.


	For the Three Months Ended September 30		For the Nine Months Ended September 30
(In thousands)	2019		2019
Interest income recognized on impaired loans:
Business	$	222	$	665
Real estate – construction and land	1		2
Real estate – business	363		1,088
Real estate – personal	31		92
Consumer	76		227
Revolving home equity	1		2
Consumer credit card	181		542
Total	$	875	$	2,618

Loans held for sale

The Company designates certain long-term fixed rate personal real estate loans as held for sale, and the Company has elected the fair value option for these loans. The election of the fair value option aligns the accounting for these loans with the related economic hedges discussed in Note 11. The loans are primarily sold to FNMA, FHLMC, and GNMA. At September 30, 2020, the fair value of these loans was $35.1 million, and the unpaid principal balance was $33.3 million

The Company also designates certain student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans within 210 days after the last disbursement to the student. These loans are carried at lower of cost or fair value, which at September 30, 2020 totaled $4.4 million.

At September 30, 2020, none of the loans held for sale were on non-accrual status or 90 days past due and still accruing.

Foreclosed real estate/repossessed assets

The Company’s holdings of foreclosed real estate totaled $57 thousand and $365 thousand at September 30, 2020 and December 31, 2019, respectively. Personal property acquired in repossession, generally autos, marine and recreational vehicles (RV), totaled $1.3 million and $5.5 million at September 30, 2020 and December 31, 2019, respectively. Upon acquisition, these assets are recorded at fair value less estimated selling costs at the date of foreclosure, establishing a new cost basis. They are subsequently carried at the lower of this cost basis or fair value less estimated selling costs.

Investment Securities

9 Months Ended

Sep. 30, 2020

Investment Securities [Abstract]

Investment Securities

Investment securities consisted of the following at September 30, 2020 and December 31, 2019.


(In thousands)	September 30, 2020		December 31, 2019
Available for sale debt securities	$	11,539,061	$	8,571,626
Trading debt securities	25,805		28,161
Equity securities:
Readily determinable fair value	2,803		2,929
No readily determinable fair value	1,400		1,280
Other:
Federal Reserve Bank stock	34,070		33,770
Federal Home Loan Bank stock	10,000		10,000
Private equity investments	78,462		94,122
Total investment securities (1)	$	11,691,601	$	8,741,888

(1)Accrued interest receivable totaled $39.7 million at September 30, 2020 and was included within other assets on the consolidated balance sheet.

The Company has elected to measure equity securities with no readily determinable fair value at cost minus impairment, if any, plus or minus changes resulting from observable price changes for the identical or similar investment of the same issuer. This portfolio includes the Company's holdings of Visa Class B shares, which have a carrying value of zero, as there have not been observable price changes in orderly transactions for identical or similar investments of the same issuer. During the period, the Company did not record any impairment or other adjustments to the carrying amount of these equity securities without a readily determinable fair value.

Other investment securities include Federal Reserve Bank (FRB) stock, Federal Home Loan Bank (FHLB) stock, and investments in portfolio concerns held by the Company's private equity subsidiaries. FRB stock and FHLB stock are held for debt and regulatory purposes. Investment in FRB stock is based on the capital structure of the investing bank, and investment in FHLB stock is tied to the level of borrowings from the FHLB. These holdings are carried at cost. The private equity investments, in the absence of readily ascertainable market values, are carried at estimated fair value.

The majority of the Company’s investment portfolio is comprised of available for sale debt securities, which are carried at fair value with changes in fair value reported in accumulated other comprehensive income (AOCI). A summary of the available for sale debt securities by maturity groupings as of September 30, 2020 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as the FHLMC, FNMA, and GNMA, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards,

automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral.


(In thousands)	Amortized Cost		Fair Value
U.S. government and federal agency obligations:
Within 1 year	$	59,367	$	59,706
After 1 but within 5 years	489,042		521,797
After 5 but within 10 years	225,159		253,555

Total U.S. government and federal agency obligations	773,568		835,058
Government-sponsored enterprise obligations:
Within 1 year	55,185		54,770


After 10 years	35,818		40,531
Total government-sponsored enterprise obligations	91,003		95,301
State and municipal obligations:
Within 1 year	68,787		69,179
After 1 but within 5 years	764,831		803,168
After 5 but within 10 years	597,276		624,525
After 10 years	464,375		472,272
Total state and municipal obligations	1,895,269		1,969,144
Mortgage and asset-backed securities:
Agency mortgage-backed securities	5,919,500		6,081,802
Non-agency mortgage-backed securities	324,266		332,970
Asset-backed securities	1,633,988		1,658,579
Total mortgage and asset-backed securities	7,877,754		8,073,351
Other debt securities:
Within 1 year	23,565		23,701
After 1 but within 5 years	252,180		264,096
After 5 but within 10 years	240,814		249,136
After 10 years	28,195		29,274
Total other debt securities	544,754		566,207
Total available for sale debt securities	$	11,182,348	$	11,539,061

Investments in U.S. government and federal agency obligations include U.S. Treasury inflation-protected securities, which totaled $429.8 million, at fair value, at September 30, 2020. Interest paid on these securities increases with inflation and decreases with deflation, as measured by the Consumer Price Index.

Allowance for credit losses on available for sale debt securities

As described in Note 1, the Company adopted ASU 2016-13, Measurement of Credit Losses on Financial Instruments, on January 1, 2020. The adoption of ASU 2016-13 had no impact to the Company's available for sale securities reported in its consolidated financial statements at January 1, 2020. For the three and nine months ended September 30, 2020, the Company did not recognize a credit loss expense on any available for sale debt securities.

The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis is placed on securities whose credit rating has fallen below Baa3 (Moody's) or BBB- (Standard & Poor's), whose fair values have fallen more than 20% below purchase price, or who have been identified based on management’s judgment. These securities are placed on a watch list and cash flow analyses are prepared on an individual security basis. Inputs to these models include factors such as cash flow projections, contractual payments required, delinquency rates, credit support from other tranches, prepayment speeds, collateral loss severity rates (including loan to values), and various other information related to the underlying collateral. Stress tests are performed at varying levels of delinquency rates, prepayment speeds and loss severities in order to gauge probable ranges of credit loss. At September 30, 2020, the fair value of securities on this watch list was $53.3 million compared to $51.6 million at December 31, 2019.

The Company's model for establishing its allowance for credit losses uses cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. As of September 30, 2020, the Company did not identify any securities for which a credit loss exists. Significant inputs to the cash flow models used at September 30, 2020 to quantify credit losses included the following:


Significant Inputs	Range
Prepayment CPR	0%	-	25%
Projected cumulative default	13%	-	54%
Credit support	0%	-	20%
Loss severity	7%	-	63%

The table below summarizes debt securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded at September 30, 2020. Unrealized losses on these available for sale securities have not been recognized into income because the issuers' bonds are of investment grade quality (rated Baa3, BBB- or higher), their fair values have not fallen more than 20% below purchase price, and they have not been identified by management as a security needing a more detailed review. Additionally, management does not intend to sell the securities, and it is more likely than not that management will not be required to sell the securities prior to their anticipated recovery. The cash flow analyses prepared for securities included on the watch list discussed above did not identify any instances where the present value of expected cash flows were less than the amortized cost basis of the security.

The following table summarizes debt securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded at September 30, 2020, aggregated by major security type and length of impairment period.


	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
September 30, 2020

Government-sponsored enterprise obligations	$	14,489	$	503	$	—	$	—	$	14,489	$	503
State and municipal obligations	84,876		578		—		—		84,876		578
Mortgage and asset-backed securities:
Agency mortgage-backed securities	287,620		5,402		—		—		287,620		5,402
Non-agency mortgage-backed securities	68,513		234		1,069		45		69,582		279
Asset-backed securities	97,592		1,100		245,198		6,196		342,790		7,296
Total mortgage and asset-backed securities	453,725		6,736		246,267		6,241		699,992		12,977
Other debt securities	43,600		493		—		—		43,600		493
Total	$	596,690	$	8,310	$	246,267	$	6,241	$	842,957	$	14,551

Debt securities available for sale in an unrealized loss position, aggregated by major security type and length of impairment period, are as follows:


	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2019
U.S. government and federal agency obligations	$	31,787	$	21	$	25,405	$	21	$	57,192	$	42
Government-sponsored enterprise obligations	6,155		187		—		—		6,155		187
State and municipal obligations	6,700		31		1,554		1		8,254		32
Mortgage and asset-backed securities:
Agency mortgage-backed securities	652,352		5,306		147,653		867		800,005		6,173
Non-agency mortgage-backed securities	102,931		254		189,747		451		292,678		705
Asset-backed securities	330,876		3,610		152,461		2,108		483,337		5,718
Total mortgage and asset-backed securities	1,086,159		9,170		489,861		3,426		1,576,020		12,596
Other debt securities	5,496		4		997		3		6,493		7
Total	$	1,136,297	$	9,413	$	517,817	$	3,451	$	1,654,114	$	12,864

The entire available for sale debt portfolio included $843.0 million of securities that were in a loss position at September 30, 2020, compared to $1.7 billion at December 31, 2019. The total amount of unrealized loss on these securities was $14.6 million

at September 30, 2020, an increase of $1.7 million compared to the loss at December 31, 2019. Securities with significant unrealized losses are discussed in the "Allowance for credit losses on available for sale debt securities" section above.

For debt securities classified as available for sale, the following table shows the amortized cost, fair value, and allowance for credit losses of securities available for sale at September 30, 2020 and the corresponding amounts of gross unrealized gains and losses (pre-tax) in AOCI, by security type.


(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Fair Value
September 30, 2020
U.S. government and federal agency obligations	$	773,568	$	61,490	$	—	$	—	$	835,058
Government-sponsored enterprise obligations	91,003		4,801		(503)		—		95,301
State and municipal obligations	1,895,269		74,453		(578)		—		1,969,144
Mortgage and asset-backed securities:
Agency mortgage-backed securities	5,919,500		167,704		(5,402)		—		6,081,802
Non-agency mortgage-backed securities	324,266		8,983		(279)		—		332,970
Asset-backed securities	1,633,988		31,887		(7,296)		—		1,658,579
Total mortgage and asset-backed securities	7,877,754		208,574		(12,977)		—		8,073,351
Other debt securities	544,754		21,946		(493)		—		566,207
Total	$	11,182,348	$	371,264	$	(14,551)	$	—	$	11,539,061

For debt securities classified as available for sale, the following table shows the amortized cost and fair value of securities available-for-sale at December 31, 2019 and the corresponding amounts of gross unrealized gains and losses (pre-tax) in AOCI, by security type.


(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2019
U.S. government and federal agency obligations	$	827,861	$	23,957	$	(42)	$	851,776
Government-sponsored enterprise obligations	138,734		730		(187)		139,277
State and municipal obligations	1,225,532		42,427		(32)		1,267,927
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,893,247		50,890		(6,173)		3,937,964
Non-agency mortgage-backed securities	796,451		14,036		(705)		809,782
Asset-backed securities	1,228,151		11,056		(5,718)		1,233,489
Total mortgage and asset-backed securities	5,917,849		75,982		(12,596)		5,981,235
Other debt securities	325,555		5,863		(7)		331,411
Total	$	8,435,531	$	148,959	$	(12,864)	$	8,571,626

The following tables present proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.


	For the Nine Months Ended September 30
(In thousands)	2020		2019
Proceeds from sales of securities:
Available for sale debt securities	$	574,374	$	368,939
Equity securities	2		3,459
Other	—		7,243
Total proceeds	$	574,376	$	379,641

Investment securities gains (losses), net:
Available for sale debt securities:

Gains realized on sales	$	16,965	$	2,287
Losses realized on sales	—		(1,559)
Other-than-temporary impairment recognized on debt securities	—		(133)
Equity securities:

Gains realized on sales	2		2,865

Fair value adjustments, net	(126)		318
Other:
Gains realized on sales	—		1,094

Fair value adjustments, net	(18,116)		(998)
Total investment securities gains (losses), net	$	(1,275)	$	3,874

Net gains and losses on investment securities for the nine months ended September 30, 2020 included net gains of $17.0 million realized on sales of available for sale debt securities as well as net losses in fair value of $126 thousand and $18.1 million on equity securities and private equity investments, respectively, due to fair value adjustments.

At September 30, 2020, securities totaling $4.5 billion in fair value were pledged to secure public fund deposits, securities sold under agreements to repurchase, trust funds, and borrowings at the FRB and FHLB. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $218.0 million, while the remaining securities were pledged under agreements pursuant to which the secured parties may not sell or re-pledge the collateral. Except for obligations of various government-sponsored enterprises such as FNMA, FHLB and FHLMC, no investment in a single issuer exceeded 10% of stockholders’ equity.

Goodwill And Other Intangible Assets

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Other Intangible Assets

Goodwill and Other Intangible Assets

The following table presents information about the Company's intangible assets which have estimable useful lives.


	September 30, 2020								December 31, 2019
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Valuation Allowance		Net Amount		Gross Carrying Amount		Accumulated Amortization		Valuation Allowance		Net Amount
Amortizable intangible assets:
Core deposit premium	$	31,270	$	(29,818)	$	—	$	1,452	$	31,270	$	(29,485)	$	—	$	1,785
Mortgage servicing rights	13,983		(6,102)		(2,150)		5,731		12,942		(4,866)		(327)		7,749
Total	$	45,253	$	(35,920)	$	(2,150)	$	7,183	$	44,212	$	(34,351)	$	(327)	$	9,534

Aggregate amortization expense on intangible assets was $859 thousand and $395 thousand for the three month periods ended September 30, 2020 and 2019, respectively, and $1.6 million and $1.1 million for the nine month periods ended September 30, 2020 and 2019, respectively. The following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of September 30, 2020. The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions.


(In thousands)
2020	$	2,143
2021	1,243
2022	1,013
2023	834
2024	689

Changes in the carrying amount of goodwill and net other intangible assets for the nine month period ended September 30, 2020 are as follows:


(In thousands)	Goodwill		Core Deposit Premium		Mortgage Servicing Rights
Balance January 1, 2020	$	138,921	$	1,785	$	7,749

Originations	—		—		1,041
Amortization	—		(333)		(1,236)
Impairment	—		—		(1,823)
Balance September 30, 2020	$	138,921	$	1,452	$	5,731

Goodwill allocated to the Company’s operating segments at September 30, 2020 and December 31, 2019 is shown below.


(In thousands)
Consumer segment	$	70,721
Commercial segment	67,454
Wealth segment	746
Total goodwill	$	138,921

Guarantees	9 Months Ended
Guarantees	Sep. 30, 2020
Guarantees [Abstract]
Guarantees	Guarantees The Company, as a provider of financial services, routinely issues financial guarantees in the form of financial and performance standby letters of credit. Standby letters of credit are contingent commitments issued by the Company generally to guarantee the payment or performance obligation of a customer to a third party. While these represent a potential outlay by the Company, a significant amount of the commitments may expire without being drawn upon. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit. The letters of credit are subject to the same credit policies, underwriting standards and approval process as loans made by the Company. Most of the standby letters of credit are secured, and in the event of nonperformance by customers, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities. Upon issuance of standby letters of credit, the Company recognizes a liability for the fair value of the obligation undertaken, which is estimated to be equivalent to the amount of fees received from the customer over the life of the agreement. At September 30, 2020, that net liability was $3.3 million, which will be accreted into income over the remaining life of the respective commitments. The contractual amount of these letters of credit, which represents the maximum potential future payments guaranteed by the Company, was $318.0 million at September 30, 2020. The Company periodically enters into credit risk participation agreements (RPAs) as a guarantor to other financial institutions, in order to mitigate those institutions’ credit risk associated with interest rate swaps with third parties. The RPA stipulates that, in the event of default by the third party on the interest rate swap, the Company will reimburse a portion of the loss borne by the financial institution. These interest rate swaps are normally collateralized (generally with real property, inventories and equipment) by the third party, which limits the credit risk associated with the Company’s RPAs. The third parties usually have other borrowing relationships with the Company. The Company monitors overall borrower collateral and at September 30, 2020, believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 2 years to 11 years. At September 30, 2020, the fair value of the Company's guarantee liabilities for RPAs was $1.2 million, and the notional amount of the underlying swaps was $272.8 million. The maximum potential future payment guaranteed by the Company cannot be readily estimated but is dependent upon the fair value of the interest rate swaps at the time of default.

Leases

9 Months Ended

Sep. 30, 2020

Leases [Abstract]

Leases

The Company has net investments in direct financing and sales-type leases to commercial, industrial, and tax-exempt entities. These leases are included within business loans on the Company's consolidated balance sheets. The Company primarily leases various types of equipment, trucks and trailers, and office furniture and fixtures. Lease agreements may include options to renew or for the lessee to purchase the leased equipment at the end of the lease term. The Company has elected to adopt the lease component expedient in which the lease and nonlease components are combined into the total lease receivable. The Company also leases office space to third parties, and these leases are classified as operating leases. The leases may include options to renew or expand the leased space, and currently the leases have remaining terms of 6 months to 7 years.

The following table provides the components of lease income.


	For the Three Months Ended September 30				For the Nine Months Ended September 30
(in thousands)	2020		2019		2020		2019
Direct financing and sales-type leases	$	6,437	$	6,092	$	19,099	$	17,988
Operating leases(a)	2,270		1,984		6,491		5,816
Total lease income	$	8,707	$	8,076	$	25,590	$	23,804

(a) Includes rent from Tower Properties Company, a related party, of $19 thousand for the three month periods ended September 30, 2020 and 2019, and $57 thousand and $56 thousand, respectively, for the nine months ended September 30, 2020 and 2019.

Pension

9 Months Ended

Sep. 30, 2020

Pension [Abstract]

Pension

The amount of net pension cost is shown in the table below:


	For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands)	2020		2019		2020		2019
Service cost - benefits earned during the period	$	93	$	159	$	295	$	477
Interest cost on projected benefit obligation	818		1,065		2,463		3,195
Expected return on plan assets	(1,317)		(1,196)		(3,911)		(3,589)
Amortization of prior service cost	(67)		(68)		(203)		(203)
Amortization of unrecognized net loss	503		586		1,587		1,757
Net periodic pension cost	$	30	$	546	$	231	$	1,637

All benefits accrued under the Company’s defined benefit pension plan have been frozen since January 1, 2011. During the first nine months of 2020, the Company made no funding contributions to its defined benefit pension plan and made minimal funding contributions to a supplemental executive retirement plan (the CERP), which carries no segregated assets.

The entire disclosure for retirement benefits.

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Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Common Stock

9 Months Ended

Sep. 30, 2020

Common Stock [Abstract]

Common Stock

Common Stock *

Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 13.


	For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands, except per share data)	2020		2019		2020		2019
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	132,448	$	109,242	$	224,168	$	314,351
Less preferred stock dividends	7,466		2,250		11,966		6,750
Net income available to common shareholders	124,982		106,992		212,202		307,601
Less income allocated to nonvested restricted stock	1,173		1,040		1,996		2,996
Net income allocated to common stock	$	123,809	$	105,952	$	210,206	$	304,605
Weighted average common shares outstanding	110,720		112,982		110,848		114,475
Basic income per common share	$	1.12	$	.93	$	1.90	$	2.65
Diluted income per common share:
Net income available to common shareholders	$	124,982	$	106,992	$	212,202	$	307,601
Less income allocated to nonvested restricted stock	1,170		1,039		1,993		2,991
Net income allocated to common stock	$	123,812	$	105,953	$	210,209	$	304,610
Weighted average common shares outstanding	110,720		112,982		110,848		114,475
Net effect of the assumed exercise of stock-based awards - based on
the treasury stock method using the average market price for the respective periods	179		267		209		284
Weighted average diluted common shares outstanding	110,899		113,249		111,057		114,759
Diluted income per common share	$	1.11	$	.93	$	1.89	$	2.65

Unexercised stock appreciation rights of 394 thousand and 378 thousand for the three month periods ended September 30, 2020 and 2019, respectively, and 281 thousand and 351 thousand for the nine month periods ended September 30, 2020 and 2019, respectively, were excluded from the computation of diluted income per common share because their inclusion would have been anti-dilutive.

On September 1, 2020, the Company redeemed all outstanding shares of its 6.00% Series B Non-Cumulative Perpetual Preferred Stock, $1.00 par value per share (Series B Preferred Stock) and the corresponding depositary shares representing fractional interests in the Series B Preferred Stock (Series B Depositary Shares). The 6,000,000 depositary shares, each representing a 1/1,000th interest in a share of Series B Preferred Stock, were redeemed simultaneously with the redemption of the Series B Preferred Stock at a redemption price of $25 per depositary share. Regular dividends on the outstanding shares of the Series B Preferred Stock were paid separately on September 1, 2020 to all holders of record as of August 14, 2020, in the customary manner, and future dividends ceased to accrue. For the nine month period ended September 30, 2020, preferred stock dividends totaled $12.0 million, and included $5.2 million related to the preferred stock redemption, which is the excess of the redemption costs over the book value of the preferred stock.

* All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2019.

Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2020

Accumulated Other Comprehensive Income

The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale debt securities. Another component is the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. The remaining component is gains and losses in fair value on certain interest rate floors that have been designated as cash flow hedging instruments. Information about unrealized gains and losses on securities can be found in Note 3, and information about unrealized gains and losses on cash flow hedge derivatives is located in Note 11.

The Company adopted ASU 2016-13 (CECL) on January 1, 2020, which changed the impairment model for available for sale debt securities. The new standard requires an allowance for credit losses when the present value of the cash flows expected to be collected is less than the security's amortized cost basis. See further discussion of the Company's CECL adoption in Note 1 and Note 3 to the consolidated financial statements. Further, the new standard superceded the guidance related to other-than-temporary impairment (OTTI), including the requirement to separately disclose the unrealized gains and losses on securities with OTTI. Prior to the Company's adoption of CECL, unrealized gains and losses on debt securities for which an OTTI has been recorded in current earnings were shown separately below. As a result of adopting CECL, the table below will separately disclose unrealized gains and losses on debt securities for which an allowance for credit losses has been recorded. During the first nine months of 2020, there were no securities for which an allowance for credit losses was recorded.


	Unrealized Gains (Losses) on Securities (1)				Pension Loss		Unrealized Gains (Losses) on Cash Flow Hedge Derivatives (2)		Total Accumulated Other Comprehensive Income (Loss)
(In thousands)	OTTI		Other
Balance January 1, 2020	$	3,264	$	98,809	$	(21,940)	$	30,311	$	110,444

Adoption of ASU 2016-13	(3,264)		3,264		—		—		—
Balance January 1, 2020, adjusted	—		102,073		(21,940)		30,311		110,444
Other comprehensive income before reclassifications to current earnings	—		237,583		—		94,702		332,285
Amounts reclassified to current earnings from accumulated other comprehensive income	—		(16,965)		1,384		(6,050)		(21,631)
Current period other comprehensive income, before tax	—		220,618		1,384		88,652		310,654
Income tax expense	—		(55,154)		(346)		(22,163)		(77,663)
Current period other comprehensive income, net of tax	—		165,464		1,038		66,489		232,991

Balance September 30, 2020	$	—	$	267,537	$	(20,902)	$	96,800	$	343,435
Balance January 1, 2019	$	3,861	$	(52,278)	$	(23,107)	$	6,855	$	(64,669)


Other comprehensive income (loss) before reclassifications to current earnings	(709)		229,288		—		46,165		274,744
Amounts reclassified to current earnings from accumulated other comprehensive income	133		(728)		1,554		2,751		3,710
Current period other comprehensive income (loss), before tax	(576)		228,560		1,554		48,916		278,454
Income tax (expense) benefit	144		(57,139)		(388)		(12,229)		(69,612)
Current period other comprehensive income (loss), net of tax	(432)		171,421		1,166		36,687		208,842
Transfer of unrealized gain on securities for which impairment was not previously recognized	35		(35)		—		—		—
Balance September 30, 2019	$	3,464	$	119,108	$	(21,941)	$	43,542	$	144,173

(1) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.

(2) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income.

Segments

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Segments

SegmentsThe Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial and Wealth. The Consumer segment consists of various consumer loan and deposit products offered through its retail branch network of approximately 160 locations. This segment also includes indirect and other consumer loan financing businesses, along with debit and credit card loan and fee businesses. Residential mortgage origination, sales and servicing functions are included in this Consumer segment, but residential mortgage loans retained by the Company are not considered part of this segment and are instead included in the Other segment. The Commercial segment provides corporate lending, leasing, and international services, along with business and governmental deposit products and commercial cash management services. This segment includes both merchant and commercial bank card products. It also

includes the Capital Markets Group, which sells fixed income securities and provides safekeeping and accounting services to its business and correspondent bank customers. The Wealth segment provides traditional trust and estate planning, advisory and discretionary investment management, and brokerage services. This segment also provides various loan and deposit related services to its private banking customers.

The following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below.


(In thousands)	Consumer		Commercial		Wealth		Segment Totals		Other/Elimination		Consolidated Totals
Three Months Ended September 30, 2020
Net interest income	$	80,944	$	111,807	$	15,310	$	208,061	$	7,901	$	215,962
Provision for credit losses	(7,654)		(200)		13		(7,841)		4,740		(3,101)
Non-interest income	37,116		47,920		47,701		132,737		(3,165)		129,572
Investment securities gains, net	—		—		—		—		16,155		16,155
Non-interest expense	(73,074)		(78,283)		(31,013)		(182,370)		(8,488)		(190,858)
Income before income taxes	$	37,332	$	81,244	$	32,011	$	150,587	$	17,143	$	167,730
Nine Months Ended September 30, 2020
Net interest income	$	241,195	$	300,307	$	41,686	$	583,188	$	36,896	$	620,084
Provision for credit losses	(23,885)		(3,122)		10		(26,997)		(114,596)		(141,593)
Non-interest income	107,492		143,747		139,700		390,939		(20,189)		370,750
Investment securities losses, net	—		—		—		—		(1,275)		(1,275)
Non-interest expense	(225,791)		(237,350)		(93,156)		(556,297)		(15,771)		(572,068)
Income before income taxes	$	99,011	$	203,582	$	88,240	$	390,833	$	(114,935)	$	275,898
Three Months Ended September 30, 2019
Net interest income	$	80,111	$	85,402	$	11,525	$	177,038	$	26,474	$	203,512
Provision for loan losses	(10,757)		(345)		(197)		(11,299)		336		(10,963)
Non-interest income	36,049		53,462		45,721		135,232		(2,489)		132,743
Investment securities gains, net	—		—		—		—		4,909		4,909
Non-interest expense	(73,872)		(76,105)		(30,248)		(180,225)		(10,795)		(191,020)
Income before income taxes	$	31,531	$	62,414	$	26,801	$	120,746	$	18,435	$	139,181
Nine Months Ended September 30, 2019
Net interest income	$	236,215	$	256,649	$	35,662	$	528,526	$	90,108	$	618,634
Provision for loan losses	(33,061)		(1,053)		(165)		(34,279)		(953)		(35,232)
Non-interest income	98,840		151,655		133,556		384,051		(2,809)		381,242
Investment securities gains, net	—		—		—		—		3,874		3,874
Non-interest expense	(223,355)		(231,790)		(91,708)		(546,853)		(25,371)		(572,224)
Income before income taxes	$	78,639	$	175,461	$	77,345	$	331,445	$	64,849	$	396,294

The information presented above was derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. This information is based on internal management accounting procedures and methods, which have been developed to reflect the underlying economics of the businesses. The methodologies are applied in connection with funds transfer pricing and assignment of overhead costs among segments. Funds transfer pricing was used in the determination of net interest income by assigning a standard cost (credit) for funds used (provided) by assets and liabilities based on their maturity, prepayment and/or repricing characteristics.

The segment activity, as shown above, includes both direct and allocated items. Amounts in the “Other/Elimination” column include activity not related to the segments, such as that relating to administrative functions, the investment securities portfolio, and the effect of certain expense allocations to the segments. The provision for credit losses in this category contains the difference between net loan charge-offs assigned directly to the segments and the recorded provision for credit loss expense. Included in this category’s net interest income are earnings of the investment portfolio, which are not allocated to a segment.

The performance measurement of the operating segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments' financial condition and results of operations if they were independent entities.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Derivative Instrument Detail [Abstract]

Derivative Instruments

9 Months Ended

Sep. 30, 2020

Derivative Instruments

The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. At September 30, 2020, with the exception of the interest rate floor (discussed below), the Company’s derivative instruments are accounted for as free-standing derivatives, and changes in their fair value are recorded in current earnings.


(In thousands)	September 30, 2020		December 31, 2019
Interest rate swaps	$	2,425,837	$	2,606,181
Interest rate floors	500,000		1,500,000
Interest rate caps	113,495		59,316
Credit risk participation agreements	365,611		316,225
Foreign exchange contracts	9,293		10,936
Mortgage loan commitments	60,311		13,755
Mortgage loan forward sale contracts	9,451		1,943
Forward TBA contracts	64,500		17,500
Total notional amount	$	3,548,498	$	4,525,856

The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. The customers are engaged in a variety of businesses, including real estate, manufacturing, retail product distribution, education, and retirement communities. These customer swaps are offset by matching contracts purchased by the Company from other financial dealer institutions. Contracts with dealers that require central clearing are novated to a clearing agency who becomes the Company's counterparty. Because of the matching terms of the offsetting contracts, in addition to collateral provisions which mitigate the impact of non-performance risk, changes in fair value subsequent to initial recognition have a minimal effect on earnings.

Many of the Company’s interest rate swap contracts with large financial institutions contain contingent features relating to debt ratings or capitalization levels. Under these provisions, if the Company’s debt rating falls below investment grade or if the Company ceases to be “well-capitalized” under risk-based capital guidelines, certain counterparties can require immediate and ongoing collateralization on interest rate swaps in net liability positions or instant settlement of the contracts. The Company maintains debt ratings and capital well above these minimum requirements.

As of September 30, 2020, the Company has entered into one interest rate floor with a notional value of $500.0 million, to hedge the risk of declining interest rates on certain floating rate commercial loans indexed to one month LIBOR. The interest rate floor has a purchased strike rate of 2.00% and is effective on December 15, 2020 and matures on December 15, 2026. The premium paid for the floor totaled $10.7 million. As of September 30, 2020, the maximum length of time over which the Company is hedging its exposure to the variability in future cash flows is approximately 6.2 years. The interest rate floor qualified and was designated as a cash flow hedge, and was assessed for effectiveness using regression analysis. The change in the fair value of the interest rate floor is recorded in AOCI, net of the amortization of the premium paid, which is recorded against interest and fees on loans in the consolidated statements of income. As of September 30, 2020, net deferred gains on the interest rate floor totaled $38.7 million (pre-tax) and was recorded in AOCI in the consolidated balance sheet. As of September 30, 2020, it is expected that $1.4 million (pre-tax) of interest rate floor premium amortization will be reclassified from AOCI into earnings over the next twelve months.

During the quarter ended September 30, 2020, the Company monetized two interest rate floors that were previously classified as cash flow hedges with a combined notional balance of $1.0 billion and an asset fair value of $115.9 million. As of September 30, 2020, the total unrealized gains on the monetized cash flow hedges remaining in AOCI was $90.4 million (pre-tax). The unrealized gains will be reclassified into interest income as the underlying forecasted transactions impact earnings through the original maturity dates of the hedged forecasted transactions, or approximately 5.7 years.

In October 2020, the Company monetized the above interest rate floor that is effective on December 15, 2020 and will amortize a gain of $37.6 million into earnings through December 15, 2026, the original maturity date.

The Company also contracts with other financial institutions, as a guarantor or beneficiary, to share credit risk associated with certain interest rate swaps through risk participation agreements. The Company’s risks and responsibilities as guarantor are further discussed in Note 5 on Guarantees. In addition, the Company enters into foreign exchange contracts, which are mainly comprised of contracts to purchase or deliver foreign currencies for customers at specific future dates.

Under its program to sell residential mortgage loans in the secondary market, the Company designates certain newly-originated residential mortgage loans as held for sale. Derivative instruments arising from this activity include mortgage loan commitments and forward loan sale contracts. Changes in the fair values of the loan commitments and funded loans prior to sale that are due to changes in interest rates are economically hedged with forward contracts to sell residential mortgage-backed securities in the to-be-announced (TBA) market. These forward TBA contracts are also considered to be derivatives and are settled in cash at the security settlement date.

The fair values of the Company's derivative instruments, whose notional amounts are listed above, are shown in the table below. Information about the valuation methods used to determine fair value is provided in Note 17 on Fair Value Measurements in the 2019 Annual Report on Form 10-K.

The Company's policy is to present its derivative assets and derivative liabilities on a gross basis in its consolidated balance sheets and these are reported in other assets and other liabilities. Certain collateral posted to and from the Company's clearing counterparty has been applied to the fair values of the cleared swaps, such that at September 30, 2020 in the table below, there were no reductions to the positive fair values of cleared swaps and the negative fair values of cleared swaps were reduced by $77.8 million. At December 31, 2019, the positive fair values of cleared swaps were reduced by $617 thousand and the negative fair values of cleared swaps were reduced by $28.5 million.


	Asset Derivatives				Liability Derivatives
	Sept. 30, 2020		Dec. 31, 2019		Sept. 30, 2020		Dec. 31, 2019
(In thousands)	Fair Value				Fair Value
Derivatives designated as hedging instruments:
Interest rate floors	$	47,306	$	67,192	$	—	$	—
Total derivatives designated as hedging instruments	$	47,306	$	67,192	$	—	$	—
Derivative instruments not designated as hedging instruments:
Interest rate swaps	$	96,866	$	37,774	$	(18,981)	$	(9,916)
Interest rate caps	1		4		(1)		(4)
Credit risk participation agreements	440		140		(1,185)		(230)
Foreign exchange contracts	32		97		(50)		(32)
Mortgage loan commitments	3,137		459		—		—
Mortgage loan forward sale contracts	29		6		(6)		(2)
Forward TBA contracts	39		2		(147)		(35)
Total derivatives not designated as hedging instruments	$	100,544	$	38,482	$	(20,370)	$	(10,219)
Total	$	147,850	$	105,674	$	(20,370)	$	(10,219)

The pre-tax effects of derivative instruments on the consolidated statements of income are shown in the tables below.


	Amount of Gain or (Loss) Recognized in OCI						Location of Gain (Loss) Reclassified from AOCI into Income	Amount of Gain (Loss) Reclassified from AOCI into Income

(In thousands)	Total		Included Component		Excluded Component			Total		Included Component		Excluded Component
For the Three Months Ended September 30, 2020
Derivatives in cash flow hedging relationships:
Interest rate floors	$	(4,481)	$	(4,087)	$	(394)	Interest and fees on loans	$	4,163	$	5,509	$	(1,346)
Total	$	(4,481)	$	(4,087)	$	(394)	Total	$	4,163	$	5,509	$	(1,346)
For the Nine Months Ended September 30, 2020
Derivatives in cash flow hedging relationships:
Interest rate floors	$	94,702	$	121,621	$	(26,919)	Interest and fees on loans	$	6,050	$	9,458	$	(3,408)
Total	$	94,702	$	121,621	$	(26,919)	Total	$	6,050	$	9,458	$	(3,408)
For the Three Months Ended September 30, 2019
Derivatives in cash flow hedging relationships:
Interest rate floors	$	17,760	$	31,422	$	(13,662)	Interest and fees on loans	$	(1,042)	$	—	$	(1,042)
Total	$	17,760	$	31,422	$	(13,662)	Total	$	(1,042)	$	—	$	(1,042)
For the Nine Months Ended September 30, 2019
Derivatives in cash flow hedging relationships:
Interest rate floors	$	46,165	$	77,559	$	(31,394)	Interest and fees on loans	$	(2,751)	$	—	$	(2,751)
Total	$	46,165	$	77,559	$	(31,394)	Total	$	(2,751)	$	—	$	(2,751)


	Location of Gain or (Loss) Recognized in Income on Derivatives	Amount of Gain or (Loss) Recognized in Income on Derivatives
		For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands)		2020		2019		2020		2019



Derivative instruments:
Interest rate swaps	Other non-interest income	$	81	$	1,519	$	369	$	2,646
Interest rate caps	Other non-interest income	1		—		20		—
Credit risk participation agreements	Other non-interest income	(87)		37		153		78
Foreign exchange contracts	Other non-interest income	—		(5)		(82)		(2)
Mortgage loan commitments	Loan fees and sales	589		(112)		2,678		287
Mortgage loan forward sale contracts	Loan fees and sales	20		(2)		19		1
Forward TBA contracts	Loan fees and sales	(709)		(1,412)		(482)		(819)
Total		$	(105)	$	25	$	2,675	$	2,191

The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. It also provides information about these instruments which are subject to an enforceable master netting arrangement, irrespective of whether they are offset, and the extent to which the instruments could potentially be offset. Also shown is collateral received or pledged in the form of other financial instruments, which is generally cash or marketable securities. The collateral amounts in this table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus, amounts of excess collateral are not shown. Most of the derivatives in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

Collateral exchanged between the Company and dealer bank counterparties is generally subject to thresholds and transfer minimums, and usually consists of marketable securities. By contract, these may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash or securities to its clearing agent. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below.


							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Collateral Received/Pledged		Net Amount
September 30, 2020
Assets:
Derivatives subject to master netting agreements	$	144,440	$	—	$	144,440	$	(9,933)	$	(37,441)	$	97,066
Derivatives not subject to master netting agreements	3,410		—		3,410
Total derivatives	$	147,850	$	—	$	147,850
Liabilities:
Derivatives subject to master netting agreements	$	19,915	$	—	$	19,915	$	(9,933)	$	(8,719)	$	1,263
Derivatives not subject to master netting agreements	455		—		455
Total derivatives	$	20,370	$	—	$	20,370
December 31, 2019
Assets:
Derivatives subject to master netting agreements	$	105,147	$	—	$	105,147	$	(8,104)	$	(59,525)	$	37,518
Derivatives not subject to master netting agreements	527		—		527
Total derivatives	$	105,674	$	—	$	105,674
Liabilities:
Derivatives subject to master netting agreements	$	10,083	$	—	$	10,083	$	(8,104)	$	(437)	$	1,542
Derivatives not subject to master netting agreements	136		—		136
Total derivatives	$	10,219	$	—	$	10,219

Resale and Repurchase Agreements

9 Months Ended

Sep. 30, 2020

Resale and Repurchase Agreements [Abstract]

Resale and Repurchase Agreements [Text Block]

Resale and Repurchase Agreements

The following table shows the extent to which assets and liabilities relating to securities purchased under agreements to resell (resale agreements) and securities sold under agreements to repurchase (repurchase agreements) have been offset in the consolidated balance sheets, in addition to the extent to which they could potentially be offset. Also shown is collateral received or pledged, which consists of marketable securities. The collateral amounts in the table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus, amounts of excess collateral are not shown. The agreements in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default.

Resale and repurchase agreements are agreements to purchase/sell securities subject to an obligation to resell/repurchase the same or similar securities. They are accounted for as collateralized financing transactions, not as sales and purchases of the securities portfolio. The securities collateral accepted or pledged in resale and repurchase agreements with other financial institutions also may be sold or re-pledged by the secured party but is usually delivered to and held by third party trustees. The Company generally retains custody of securities pledged for repurchase agreements with customers.

The Company is party to agreements commonly known as collateral swaps. These agreements involve the exchange of collateral under simultaneous repurchase and resale agreements with the same financial institution counterparty. These repurchase and resale agreements have the same principal amounts, inception dates, and maturity dates and have been offset against each other in the consolidated balance sheets, as permitted under the netting provisions of ASC 210-20-45. The collateral swaps totaled $200.0 million at September 30, 2020 and December 31, 2019. At September 30, 2020, the Company had posted collateral of $209.6 million in marketable securities, consisting of agency mortgage-backed bonds, and had accepted $209.0 million in agency mortgage-backed bonds.


							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged		Net Amount
September 30, 2020
Total resale agreements, subject to master netting arrangements	$	1,050,000	$	(200,000)	$	850,000	$	—	$	(850,000)	$	—
Total repurchase agreements, subject to master netting arrangements	1,846,294		(200,000)		1,646,294		—		(1,646,294)		—
December 31, 2019
Total resale agreements, subject to master netting arrangements	$	1,050,000	$	(200,000)	$	850,000	$	—	$	(850,000)	$	—
Total repurchase agreements, subject to master netting arrangements	2,030,737		(200,000)		1,830,737		—		(1,830,737)		—

The table below shows the remaining contractual maturities of repurchase agreements outstanding at September 30, 2020 and December 31, 2019, in addition to the various types of marketable securities that have been pledged by the Company as collateral for these borrowings.


	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
September 30, 2020
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	146,935	$	—	$	—	$	146,935
Government-sponsored enterprise obligations	21,386		—		—		21,386

Agency mortgage-backed securities	1,167,467		58,729		214,896		1,441,092
Non-agency mortgage-backed securities	98,651		—		—		98,651
Asset-backed securities	103,861		—		—		103,861
Other debt securities	34,369		—		—		34,369
Total repurchase agreements, gross amount recognized	$	1,572,669	$	58,729	$	214,896	$	1,846,294
December 31, 2019
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	526,283	$	—	$	—	$	526,283
Government-sponsored enterprise obligations	32,575		—		—		32,575

Agency mortgage-backed securities	973,774		48,517		227,802		1,250,093
Non-agency mortgage-backed securities	71,399		—		—		71,399
Asset-backed securities	60,012		40,000		—		100,012
Other debt securities	50,375		—		—		50,375
Total repurchase agreements, gross amount recognized	$	1,714,418	$	88,517	$	227,802	$	2,030,737

Stock-Based Compensation

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Stock-Based Compensation

The Company issues stock-based compensation in the form of nonvested restricted stock and stock appreciation rights (SARs). Most of the awards are issued during the first quarter of each year. The stock-based compensation expense that has been charged against income was $3.8 million and $3.5 million in the three months ended September 30, 2020 and 2019, respectively, and $11.2 million and $10.4 million in the nine months ended September 30, 2020 and 2019, respectively.

Nonvested stock awards granted generally vest in 4 to 7 years and contain restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant. A summary of the status of the Company’s nonvested share awards as of September 30, 2020, and changes during the nine month period then ended, is presented below.


	Shares	Weighted Average Grant Date Fair Value
Nonvested at January 1, 2020	1,104,211	$47.57
Granted	218,257	64.22
Vested	(275,070)	33.97
Forfeited	(6,730)	55.42

Nonvested at September 30, 2020	1,040,668	$54.61

SARs are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs vest ratably over 4 years of continuous service and have contractual terms of 10 years. All SARs must be settled in stock under provisions of the plan. In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs on date of grant. The current year per share average fair value and the model assumptions are shown in the table below.


Weighted per share average fair value at grant date	$10.12
Assumptions:
Dividend yield	1.7	%
Volatility	20.2	%
Risk-free interest rate	1.0	%
Expected term	5.8 years

A summary of SAR activity during the first nine months of 2020 is presented below.


(Dollars in thousands, except per share data)	Rights	Weighted Average Exercise Price	Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2020	1,049,816	$43.55
Granted	103,210	63.18
Forfeited	(5,600)	58.15
Expired	(150)	57.07
Exercised	(150,029)	34.52
Outstanding at September 30, 2020	997,247	$46.86	6.4 years	$	10,582

Revenue from Contract with Customer

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue from Contracts with Customers The core principle of ASU 2014-09, "Revenue from Contracts with Customers," is that an entity should recognize revenue to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For the nine months ended September 30, 2020, approximately 63% of the Company’s total revenue was comprised of net interest income, which is not within the scope of this guidance. Of the remaining revenue, those items that were subject to this guidance mainly included fees for bank card, trust, deposit account services and consumer brokerage services.

The following table disaggregates non-interest income subject to ASU 2014-09 by major product line.


	Three Months Ended September 30				Nine Months Ended September 30
(In thousands)	2020		2019		2020		2019
Bank card transaction fees	$	37,873	$	44,510	$	111,818	$	126,800
Trust fees	40,769		39,592		118,676		115,223
Deposit account charges and other fees	23,107		24,032		69,063		71,009
Consumer brokerage services	4,011		4,030		11,099		11,665
Other non-interest income	7,566		9,809		23,718		27,003
Total non-interest income from contracts with customers	113,326		121,973		334,374		351,700
Other non-interest income (1)	16,246		10,770		36,376		29,542
Total non-interest income	$	129,572	$	132,743	$	370,750	$	381,242

(1) This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions.

For bank card transaction fees, the majority of debit and credit card fees are earned in the Consumer segment, while corporate card and merchant fees are earned in the Commercial segment. The Consumer and Commercial segments each contribute approximately half of the Company's deposit account charge revenue. All trust fees and nearly all of the consumer brokerage services income are earned in the Wealth segment.

The following table presents the opening and closing receivable balances for the nine month periods ended September 30, 2020 and 2019 for the Company’s significant revenue categories subject to ASU 2014-09.


(In thousands)	September 30, 2020		December 31, 2019		September 30, 2019		December 31, 2018
Bank card transaction fees	$	11,501	$	13,915	$	10,871	$	13,035
Trust fees	2,122		2,093		2,666		2,721
Deposit account charges and other fees	5,839		6,523		5,154		6,107
Consumer brokerage services	476		596		655		559

For these revenue categories, none of the transaction price has been allocated to performance obligations that are unsatisfied as of the end of a reporting period.

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Fair Value Of Financial Instruments [Abstract]

Fair Value Measurements

9 Months Ended

Sep. 30, 2020

Fair Value Measurements [Abstract]

Fair Value Measurements

The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as available for sale debt securities, equity securities, trading debt securities, certain investments relating to private equity activities, and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as mortgage servicing rights and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or fair value accounting or write-downs of individual assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. For accounting disclosure purposes, a three-level valuation hierarchy of fair value measurements has been established. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows:

•Level 1 – inputs to the valuation methodology are quoted prices for identical assets or liabilities in active markets.

•Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds).

•Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company’s best information and assumptions that a market participant would consider.

The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in the Fair Value Measurements note in the Company's 2019 Annual Report on Form 10-K. There have been no significant changes in these methodologies since then.

Instruments Measured at Fair Value on a Recurring Basis

The table below presents the September 30, 2020 and December 31, 2019 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first nine months of 2020 or the year ended December 31, 2019.


			Fair Value Measurements Using
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2020
Assets:
Residential mortgage loans held for sale	$	35,076	$	—	$	35,076	$	—
Available for sale debt securities:
U.S. government and federal agency obligations	835,058		835,058		—		—
Government-sponsored enterprise obligations	95,301		—		95,301		—
State and municipal obligations	1,969,144		—		1,961,278		7,866
Agency mortgage-backed securities	6,081,802		—		6,081,802		—
Non-agency mortgage-backed securities	332,970		—		332,970		—
Asset-backed securities	1,658,579		—		1,658,579		—
Other debt securities	566,207		—		566,207		—
Trading debt securities	25,805		—		25,805		—
Equity securities	2,803		2,803		—		—
Private equity investments	78,462		—		—		78,462
Derivatives *	147,850		—		144,273		3,577
Assets held in trust for deferred compensation plan	17,294		17,294		—		—
Total assets	11,846,351		855,155		10,901,291		89,905
Liabilities:
Derivatives *	20,370		—		19,185		1,185
Liabilities held in trust for deferred compensation plan	17,294		17,294		—		—
Total liabilities	$	37,664	$	17,294	$	19,185	$	1,185
December 31, 2019
Assets:
Residential mortgage loans held for sale	$	9,181	$	—	$	9,181	$	—
Available for sale debt securities:
U.S. government and federal agency obligations	851,776		851,776		—		—
Government-sponsored enterprise obligations	139,277		—		139,277		—
State and municipal obligations	1,267,927		—		1,258,074		9,853
Agency mortgage-backed securities	3,937,964		—		3,937,964		—
Non-agency mortgage-backed securities	809,782		—		809,782		—
Asset-backed securities	1,233,489		—		1,233,489		—
Other debt securities	331,411		—		331,411		—
Trading debt securities	28,161		—		28,161		—
Equity securities	2,929		2,929		—		—
Private equity investments	94,122		—		—		94,122
Derivatives *	105,674		—		105,075		599
Assets held in trust for deferred compensation plan	16,518		16,518		—		—
Total assets	8,828,211		871,223		7,852,414		104,574
Liabilities:
Derivatives *	10,219		—		9,989		230
Liabilities held in trust for deferred compensation plan	16,518		16,518		—		—
Total liabilities	$	26,737	$	16,518	$	9,989	$	230

* The fair value of each class of derivative is shown in Note 11.

The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations		Private Equity Investments		Derivatives		Total
For the three months ended September 30, 2020
Balance June 30, 2020	$	9,490	$	73,846	$	1,888	$	85,224
Total gains or losses (realized/unrealized):
Included in earnings	—		2,389		504		2,893
Included in other comprehensive income *	271		—		—		271
Investment securities called	(2,000)		—		—		(2,000)
Discount accretion	105		—		—		105
Purchases of private equity investments	—		2,522		—		2,522
Sale/pay down of private equity investments	—		(295)		—		(295)



Balance September 30, 2020	$	7,866	$	78,462	$	2,392	$	88,720
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	—	$	2,409	$	3,050	$	5,459
Total gains or losses for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	258	$	—	$	—	$	258
For the nine months ended September 30, 2020
Balance January 1, 2020	$	9,853	$	94,122	$	369	$	104,344
Total gains or losses (realized/unrealized):
Included in earnings	—		(18,116)		2,832		(15,284)
Included in other comprehensive income *	(101)		—		—		(101)
Investment securities called	(2,000)		—		—		(2,000)
Discount accretion	114		—		—		114
Purchases of private equity investments	—		2,791		—		2,791
Sale/pay down of private equity investments	—		(364)		—		(364)
Capitalized interest/dividends	—		29		—		29

Sale of risk participation agreement	—		—		(809)		(809)
Balance September 30, 2020	$	7,866	$	78,462	$	2,392	$	88,720
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	—	$	(18,096)	$	3,262	$	(14,834)
Total gains or losses for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	(52)	$	—	$	—	$	(52)


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations		Private Equity Investments		Derivatives		Total
For the three months ended September 30, 2019
Balance June 30, 2019	$	11,641	$	86,411	$	883	$	98,935
Total gains or losses (realized/unrealized):
Included in earnings	—		2,020		(75)		1,945
Included in other comprehensive income *	(65)		—		—		(65)
Investment securities called	(1,715)		—		—		(1,715)
Discount accretion	36		—		—		36
Purchases of private equity investments	—		5,010		—		5,010


Purchase of risk participation agreement	—		—		200		200
Sale of risk participation agreement	—		—		(241)		(241)
Balance September 30, 2019	$	9,897	$	93,441	$	767	$	104,105
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2019	$	—	$	2,020	$	860	$	2,880

For the nine months ended September 30, 2019
Balance January 1, 2019	$	14,158	$	85,659	$	490	$	100,307
Total gains or losses (realized/unrealized):
Included in earnings	—		(998)		365		(633)
Included in other comprehensive income *	294		—		—		294
Investment securities called	(4,635)		—		—		(4,635)
Discount accretion	80		—		—		80
Purchases of private equity investments	—		14,899		—		14,899
Sale/pay down of private equity investments	—		(6,150)		—		(6,150)
Capitalized interest/dividends	—		31		—		31
Purchase of risk participation agreement	—		—		226		226
Sale of risk participation agreement	—		—		(314)		(314)
Balance September 30, 2019	$	9,897	$	93,441	$	767	$	104,105
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2019	$	—	$	(2,448)	$	916	$	(1,532)

* Included in "net unrealized gains (losses) on other securities" in the consolidated statements of comprehensive income.

Gains and losses included in earnings for the Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income:


(In thousands)	Loan Fees and Sales		Other Non-Interest Income		Investment Securities Gains (Losses), Net		Total
For the three months ended September 30, 2020
Total gains or losses included in earnings	$	591	$	(87)	$	2,389	$	2,893
Change in unrealized gains or losses relating to assets still held at September 30, 2020	$	3,137	$	(87)	$	2,409	$	5,459
For the nine months ended September 30, 2020
Total gains or losses included in earnings	$	2,679	$	153	$	(18,116)	$	(15,284)
Change in unrealized gains or losses relating to assets still held at September 30, 2020	$	3,137	$	125	$	(18,096)	$	(14,834)
For the three months ended September 30, 2019
Total gains or losses included in earnings	$	(112)	$	37	$	2,020	$	1,945
Change in unrealized gains or losses relating to assets still held at September 30, 2019	$	823	$	37	$	2,020	$	2,880
For the nine months ended September 30, 2019
Total gains or losses included in earnings	$	287	$	78	$	(998)	$	(633)
Change in unrealized gains or losses relating to assets still held at September 30, 2019	$	823	$	93	$	(2,448)	$	(1,532)

Level 3 Inputs

The Company's significant Level 3 measurements, which employ unobservable inputs that are readily quantifiable, pertain to auction rate securities (ARS), investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $7.9 million at September 30, 2020, while private equity investments, included in other securities, totaled $78.5 million.

Information about these inputs is presented in the table below.


Quantitative Information about Level 3 Fair Value Measurements						Weighted
	Valuation Technique	Unobservable Input	Range			Average*
Auction rate securities	Discounted cash flow	Estimated market recovery period			5 years	5 years
		Estimated market rate	1.9%	-	2.3%	1.9%
Private equity investments	Market comparable companies	EBITDA multiple	4.0	-	6.0	5.3
Mortgage loan commitments	Discounted cash flow	Probability of funding	58.7%	-	99.8%	84.1%
		Embedded servicing value	.6%	-	1.0%	0.9%

* Unobservable inputs were weighted by the relative fair value of the instruments.

Instruments Measured at Fair Value on a Nonrecurring Basis

For assets measured at fair value on a nonrecurring basis during the first nine months of 2020 and 2019, and still held as of September 30, 2020 and 2019, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at September 30, 2020 and 2019.


			Fair Value Measurements Using
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Gains (Losses) Recognized During the Nine Months Ended September 30
September 30, 2020
Collateral dependent impaired loans	$	11,772	$	—	$	—	$	11,772	$	(3,214)

Mortgage servicing rights	5,731		—		—		5,731		(1,823)



September 30, 2019
Collateral dependent impaired loans	$	171	$	—	$	—	$	171	$	(139)

Mortgage servicing rights	7,235		—		—		7,235		(404)

Long-lived assets	820		—		—		820		(318)

The Company's significant Level 3 measurements that are measured on a nonrecurring basis pertain to the Company's mortgage servicing rights retained on certain fixed rate personal real estate loan originations. Mortgage servicing rights are included in other assets on the consolidated balance sheet, and information about these inputs is presented in the table below.


Quantitative Information about Level 3 Fair Value Measurements										Weighted
	Valuation Technique	Unobservable Input	Range							Average*
Mortgage servicing rights	Discounted cash flow	Discount rate	9.16		%	-	9.30		%	9.28		%
		Prepayment speeds (CPR)*	13.22		%	-	14.80		%	14.58		%
		Loan servicing costs - annually per loan
		Performing loans	$	71		-	$	72		$	72
		Delinquent loans	$	200		-	$	750
		Loans in foreclosure	$	1,000

*Ranges and weighted averages based on interest rate tranches.

The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights are updated periodically for changes in market conditions. Actual rates may differ from our estimates. Increases in prepayment speed and discount rates negatively impact the fair value of our mortgage servicing rights.

Fair Value Of Financial Instruments

9 Months Ended

Sep. 30, 2020

Fair Value Of Financial Instruments

Fair Value of Financial Instruments The carrying amounts and estimated fair values of financial instruments held by the Company are set forth below. Fair value estimates are made at a specific point in time based on relevant market information. They do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for many of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, risk characteristics and economic conditions. These estimates are subjective, involve uncertainties, and cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

The estimated fair values of the Company’s financial instruments and the classification of their fair value measurement within the valuation hierarchy are as follows at September 30, 2020 and December 31, 2019:


	Carrying Amount		Estimated Fair Value at September 30, 2020
(In thousands)			Level 1		Level 2		Level 3		Total
Financial Assets
Loans:
Business	$	6,683,413	$	—	$	—	$	6,623,709	$	6,623,709
Real estate - construction and land	1,009,729		—		—		978,403		978,403
Real estate - business	2,993,192		—		—		2,986,961		2,986,961
Real estate - personal	2,753,867		—		—		2,766,421		2,766,421
Consumer	2,006,360		—		—		1,990,589		1,990,589
Revolving home equity	324,203		—		—		320,264		320,264
Consumer credit card	647,893		—		—		576,898		576,898
Overdrafts	2,270		—		—		2,227		2,227
Total loans	16,420,927		—		—		16,245,472		16,245,472
Loans held for sale	39,483		—		39,483		—		39,483




Investment securities	11,691,601		837,861		10,721,942		131,798		11,691,601
Federal funds sold	2,275		2,275		—		—		2,275
Securities purchased under agreements to resell	850,000		—		—		903,772		903,772
Interest earning deposits with banks	1,171,697		1,171,697		—		—		1,171,697
Cash and due from banks	357,616		357,616		—		—		357,616
Derivative instruments	147,850		—		144,273		3,577		147,850
Assets held in trust for deferred compensation plan	17,294		17,294		—		—		17,294
Total	$	30,698,743	$	2,386,743	$	10,905,698	$	17,284,619	$	30,577,060
Financial Liabilities
Non-interest bearing deposits	$	10,727,827	$	10,727,827	$	—	$	—	$	10,727,827
Savings, interest checking and money market deposits	12,983,505		12,983,505		—		—		12,983,505
Certificates of deposit	1,990,447		—		—		2,002,118		2,002,118
Federal funds purchased	6,770		6,770		—		—		6,770
Securities sold under agreements to repurchase	1,646,294		—		—		1,646,338		1,646,338

Derivative instruments	20,370		—		19,185		1,185		20,370
Liabilities held in trust for deferred compensation plan	17,294		17,294		—		—		17,294
Total	$	27,392,507	$	23,735,396	$	19,185	$	3,649,641	$	27,404,222


	Carrying Amount		Estimated Fair Value at December 31, 2019
(In thousands)			Level 1		Level 2		Level 3		Total
Financial Assets
Loans:
Business	$	5,565,449	$	—	$	—	$	5,526,303	$	5,526,303
Real estate - construction and land	899,377		—		—		898,152		898,152
Real estate - business	2,833,554		—		—		2,849,213		2,849,213
Real estate - personal	2,354,760		—		—		2,333,002		2,333,002
Consumer	1,964,145		—		—		1,938,505		1,938,505
Revolving home equity	349,251		—		—		344,424		344,424
Consumer credit card	764,977		—		—		708,209		708,209
Overdrafts	6,304		—		—		4,478		4,478
Total loans	14,737,817		—		—		14,602,286		14,602,286
Loans held for sale	13,809		—		13,809		—		13,809




Investment securities	8,741,888		854,705		7,738,158		149,025		8,741,888

Securities purchased under agreements to resell	850,000		—		—		869,592		869,592
Interest earning deposits with banks	395,850		395,850		—		—		395,850
Cash and due from banks	491,615		491,615		—		—		491,615
Derivative instruments	105,674		—		105,075		599		105,674
Assets held in trust for deferred compensation plan	16,518		16,518		—		—		16,518
Total	$	25,353,171	$	1,758,688	$	7,857,042	$	15,621,502	$	25,237,232
Financial Liabilities
Non-interest bearing deposits	$	6,890,687	$	6,890,687	$	—	$	—	$	6,890,687
Savings, interest checking and money market deposits	11,621,716		11,621,716		—		—		11,621,716
Certificates of deposit	2,008,012		—		—		2,022,629		2,022,629
Federal funds purchased	20,035		20,035		—		—		20,035
Securities sold under agreements to repurchase	1,830,737		—		—		1,831,518		1,831,518
Other borrowings	988		—		988		—		988
Derivative instruments	10,219		—		9,989		230		10,219
Liabilities held in trust for deferred compensation plan	16,518		16,518		—		—		16,518
Total	$	22,398,912	$	18,548,956	$	10,977	$	3,854,377	$	22,414,310

Legal and Regulatory Proceedings	9 Months Ended
Legal and Regulatory Proceedings	Sep. 30, 2020
Legal Proceedings [Abstract]
Legal Matters and Contingencies [Text Block]	Legal and Regulatory ProceedingsThe Company has various legal proceedings pending at September 30, 2020, arising in the normal course of business. While some matters pending against the Company specify damages claimed by plaintiffs, others do not seek a specified amount of damages or are at early stages of the legal process. The Company records a loss accrual for all legal and regulatory matters for which it deems a loss is probable and can be reasonably estimated. Some matters, which are in the early stages, have not yet progressed to the point where a loss amount can be determined to be probable and estimable.

Principles of Consolidation and Presentation (Policies)	9 Months Ended
Principles of Consolidation and Presentation (Policies)	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Loans and Related Earnings	Loans and Related Earnings The Company's portfolio of held-for-investment loans includes a net investment in direct financing and sales type leases to commercial and industrial and tax-exempt entities, and collectively, the Company's portfolio of loans and leases is referred to as its "loan portfolio" or "loans". Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at amortized cost, excluding accrued interest receivable. Amortized cost is the outstanding principal balance, net of any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the interest method. Loans are presented net of the allowance for credit losses on loans. Interest on loans is accrued based upon the principal amount outstanding. The Company has elected the practical expedient to exclude all accrued interest receivable from all required disclosures of amortized cost. Additionally, an election was made not to measure an allowance for credit losses for accrued interest receivables. The Company has also made the election that all interest accrued but not received is reversed against interest income. Loan and commitment fees, net of costs, are deferred and recognized in income over the term of the loan or commitment as an adjustment of yield. Annual fees charged on credit card loans are capitalized to principal and amortized over 12 months to loan fees and sales. Other credit card fees, such as cash advance fees and late payment fees, are recognized in income as an adjustment of yield when charged to the cardholder’s account.
Past Due Loans	Past Due LoansManagement reports loans as past due on the day following the contractual repayment date if payment was not received by end of the business day. Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for credit losses on loans, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction and land real estate, and personal real estate loans are generally charged down to estimated collectible balances when they are placed on non-accrual status. Consumer loans and related accrued interest are normally charged down to the fair value of related collateral (or are charged off in full if not collateralized) once the loans are more than 120 to 180 days delinquent, depending on the type of loan. Revolving home equity loans are charged down to the fair value of the related collateral once the loans are more than 180 days past due. Credit card loans are charged off against the allowance for credit losses when the receivable is more than 180 days past due.
Restructured Loans	Troubled Debt Restructurings A loan is accounted for as a troubled debt restructuring if the Company, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. A troubled debt restructuring typically involves (1) modification of terms such as a reduction of the stated interest rate, loan principal, or accrued interest, (2) a loan renewal at a stated interest rate lower than the current market rate for a new loan with similar risk, or (3) debt that was not reaffirmed in bankruptcy. Business, business real estate, construction and land real estate and personal real estate troubled debt restructurings with impairment charges are placed on non-accrual status. The Company measures the impairment loss of a troubled debt restructuring at the time of modification based on the present value of expected future cash flows. Subsequent to modification, troubled debt restructurings are subject to the Company’s allowance for credit loss model, which is discussed below and in Note 2, Loans and Allowance for Credit Losses. Troubled debt restructurings that are performing under their contractual terms continue to accrue interest, which is recognized in current earnings. Section 4013 of the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was signed into law on March 27, 2020 and provides financial institutions the option to suspend the requirement to categorize certain modifications related to the global Coronavirus Disease 2019 (COVID-19) pandemic as troubled debt restructurings. Additionally, bank regulatory agencies issued additional guidance on implementing the provisions of the CARES Act. The Company follows the guidance under the CARES Act. Refer to Note 2 for additional information.
Allowance for Credit Losses on Loans	Allowance for Credit Losses on Loans The allowance for credit losses on loans is a valuation amount that is deducted from the amortized cost basis of loans not held at fair value to present the net amount expected to be collected over the contractual term of the loans. The allowance for credit losses on loans is measured using relevant information about past events, including historical credit loss experience on loans with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the loans. An allowance will be created upon origination or acquisition of a loan and is updated at subsequent reporting dates. The methodology is applied consistently for each reporting period and reflects management’s current expectations of credit losses. Changes to the allowance for credit losses on loans resulting from periodic evaluations are recorded through increases or decreases to the credit loss expense for loans, which is recorded in provision for credit losses on the consolidated statements of income. Loans that are deemed to be uncollectible are charged off against the related allowance for credit losses on loans. The allowance for credit losses on loans is measured on a collective (pool) basis. Loans are aggregated into pools based on similar risk characteristics including borrower type, collateral type and expected credit loss patterns. The allowance for credit losses on a troubled debt restructuring which continues to accrue interest is also measured on a collective basis. Loans that do not share similar risk characteristics, primarily large loans on non-accrual status, are evaluated on an individual basis. The allowance related to these large non-accrual loans is measured using the fair value of the collateral (less selling cost, if applicable) as most of these loans are collateral dependent and the borrower is facing financial difficulty. As noted above, the allowance for credit losses on loans does not include an allowance for accrued interest.
Off Balance Sheet Liabilities, Liability for Unfunded Commitments	Liability for Unfunded Lending Commitments The Company’s unfunded lending commitments are primarily unfunded loan commitments and letters of credit. Expected credit losses for these unfunded lending commitments are calculated over the contractual period during which the Company is exposed to the credit risk. The methodology used to measure credit losses for unfunded lending commitments is the same as the methodology used for loans, however, the estimate of credit risk for unfunded lending commitments takes into consideration the likelihood that funding will occur. The liability for unfunded lending commitments excludes any exposures that are unconditionally cancellable by the Company. The loss estimate is recorded within other liabilities on the consolidated balance sheet. Changes to the liability for unfunded lending commitments are recorded through increases or decreases to the provision for credit losses on the consolidated statements of income.
Investments in Debt and Equity Securities	Investments in Debt and Equity Securities The majority of the Company's investment portfolio is comprised of debt securities that are classified as available for sale. From time to time, the Company sells securities and utilizes the proceeds to reduce borrowings, fund loan growth, or modify its interest rate profile. Securities classified as available for sale are carried at fair value. Changes in fair value are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for credit losses in accordance with the guidance provided in ASC 326. Further discussion of this evaluation is provided in "Allowance for Credit Losses on Available for Sale Debt Securities" below. Gains and losses realized upon sales of securities are calculated using the specific identification method and are included in investment securities gains (losses), net, in the consolidated statements of income. Purchase premiums and discounts are amortized to interest income using a level yield method over the estimated lives of the securities. For certain callable debt securities purchased at a premium, the amortization is instead recorded to the earliest call date. For mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine if a change in a bond's estimated remaining life is necessary. A corresponding adjustment is then made in the related amortization of premium or discount accretion. Accrued interest receivable on available for sale debt securities is reported in other assets on the consolidated balance sheet. The Company has elected the practical expedient to exclude the accrued interest from all required disclosures of amortized cost. Additionally, an election was made not to measure an allowance for credit losses for accrued interest receivables. Interest accrued but not received is reversed against interest income. Equity securities include common and preferred stock with readily determinable fair values. These are also carried at fair value. Certain equity securities do not have readily determinable fair values. The Company has elected under ASU 2016-01 to measure these equity securities without a readily determinable fair value at cost minus impairment, if any, plus or minus changes resulting from observable price changes for the identical or similar investment of the same issuer. The Company has not recorded any impairment or other adjustments to the carrying amount of these equity investments without readily determinable fair values. Other securities include Federal Reserve Bank stock and Federal Home Loan Bank stock, which are held for debt and regulatory purposes. They are carried at cost and periodically evaluated for impairment. Also included are investments in portfolio concerns held by the Company’s private equity subsidiaries, which consist of both debt and equity instruments. Private equity investments are carried at fair value in accordance with ASC 946-10-15, with changes in fair value reported in current earnings. In the absence of readily ascertainable market values, fair value is estimated using internally developed methods. Changes in fair value which are recognized in current earnings and gains and losses from sales are included in investment securities gains (losses), net in the consolidated statements of income. Trading account securities, which are debt securities bought and held principally for the purpose of resale in the near term, are carried at fair value. Gains and losses, both realized and unrealized, are recorded in non-interest income. Purchases and sales of securities are recognized on a trade date basis. A receivable or payable is recognized for pending transaction settlements.
Allowance for Credit Losses, Available for Sale Debit Securities	Allowance for Credit Losses on Available for Sale Debt Securities For available for sale debt securities in an unrealized loss position, the entire loss in fair value is required to be recognized in current earnings if the Company intends to sell the securities or believes it more likely than not that it will be required to sell the security before the anticipated recovery. If neither condition is met, and the Company does not expect to recover the amortized cost basis, the Company determines whether the decline in fair value resulted from credit losses or other factors. If the assessment indicates that a credit loss exists, the present value of cash flows expected to be collected is compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss has occurred, and an allowance for credit losses is recorded. The allowance for credit losses is limited by the amount that the fair value is less than the amortized cost basis. Any impairment not recorded through the provision for credit losses is recognized in other comprehensive income. Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit losses on the consolidated statements of income. Losses are charged against the allowance for credit losses on securities when management believes the uncollectibility of an available for sale security is confirmed or when either of the conditions regarding intent or requirement to sell is met. Accrued interest receivable on available for sale debt securities is excluded from the estimate of credit losses.

Principles Of Consolidation And Presentation (Tables)

9 Months Ended

Sep. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The table below illustrates the adoption impact of ASU 2016-13 on the Company's allowance for credit losses.


	December 31, 2019		January 1, 2020
(In thousands)	Allowance for loan losses ending balance		CECL Adjustment		Allowance for credit losses beginning balance
Commercial:
Business	$	44,268	$	(6,328)	$	37,940
Real estate - construction and land	21,589		(12,385)		9,204
Real estate - business	25,903		(10,998)		14,905
Total Commercial:	91,760		(29,711)		62,049
Personal Banking:
Real estate - personal	3,125		1,730		4,855
Consumer	15,932		(1,414)		14,518
Revolving home equity	638		986		1,624
Consumer credit card	47,997		8,498		56,495
Overdrafts	1,230		(1,128)		102
Total Personal Banking:	68,922		8,672		77,594
Allowance for credit losses on loans	160,682		(21,039)		139,643
Liability for unfunded lending commitments	1,075		16,090		17,165
Total allowance for credit losses	$	161,757	$	(4,949)	$	156,808

Loans And Allowance For Credit Losses (Tables)

9 Months Ended

Sep. 30, 2020

Loans And Allowance For Credit Losses [Abstract]

Summary Classification Of Held For Investment Loan Portfolio

Major classifications within the Company’s held for investment loan portfolio at September 30, 2020 and December 31, 2019 are as follows:


(In thousands)	September 30, 2020		December 31, 2019
Commercial:
Business	$	6,683,413	$	5,565,449
Real estate – construction and land	1,009,729		899,377
Real estate – business	2,993,192		2,833,554
Personal Banking:
Real estate – personal	2,753,867		2,354,760
Consumer	2,006,360		1,964,145
Revolving home equity	324,203		349,251
Consumer credit card	647,893		764,977
Overdrafts	2,270		6,304
Total loans (1)	$	16,420,927	$	14,737,817

(1) Accrued interest receivable totaled $41.3 million at September 30, 2020 and was included within other assets on the consolidated balance sheet. For the three months ended September 30, 2020, the Company wrote-off accrued interest by reversing interest income of $89 thousand and $1.7 million in the Commercial and Personal Banking portfolios, respectively. Similarly, for the nine months ended September 30, 2020, the Company wrote-off accrued interest of $258 thousand and $4.4 million in the Commercial and Personal Banking portfolios, respectively.

CECL Model Inputs

Key model assumptions in the Company’s allowance for credit loss model include the economic forecast, the reasonable and supportable period, prepayment assumptions and qualitative factors applied for portfolio composition changes, underwriting practices, or significant unique events or conditions. The assumptions utilized in estimating the Company’s allowance for credit losses at September 30, 2020 and June 30, 2020 are discussed below.


Key Assumption	September 30, 2020	June 30, 2020

Overall economic forecast	•The recovery from the Global Coronavirus Recession (GCR) continues to be gradual •Assumes no additional systemic lockdown measures •Gradual recovery in late 2021 and into 2022 •Significant uncertainty regarding the pandemic and its impact on economy	•The recovery from the Global Coronavirus Recession (GCR) is gradual •Assumes no second wave of contagion and states continue to loosen lockdown measures •Gradual recovery in late 2021 and into 2022 •Significant uncertainty regarding the pandemic and its impact on economy
Reasonable and supportable period and related reversion period	•Two years for both commercial and personal banking loans •Reversion to historical average loss rates within two quarters using a straight-line method	•Two years for both commercial and personal banking loans •Reversion to historical average loss rates within two quarters using a straight-line method
Forecasted macro-economic variables	•Unemployment rate ranging from 8.8% to 5.3% during the supportable forecast period •Real GDP growth ranges from 4.4% to 2.4% •Prime rate of 3.25%	•Unemployment rate ranging from 10.9% to 5.7% during the supportable forecast period •Real GDP growth ranges from 3.0% to 25.7% •Prime rate of 3.25%
Prepayment assumptions	Commercial loans •5% for most loan pools Personal banking loans •Ranging from 21.6% to 23.5% for most loan pools •58.0% for consumer credit cards	Commercial loans •5% for most loan pools Personal banking loans •Ranging from 18.7% to 23.3% for most loan pools •58.0% for consumer credit cards
Qualitative factors	Added net reserves using qualitative processes related to: •Loans originated in our recent expansion markets, loans that are designated as shared national credits, and certain COVID-19 deferral program loans. •Changes in the composition of the loan portfolios •Loans downgraded to special mention, substandard, or non-accrual status	Added net reserves using qualitative processes related to: •Loans originated in our recent expansion markets and loans that are designated as shared national credits •Changes in the composition of the loan portfolios •Loans downgraded to special mention, substandard, or non-accrual status

Summary Of Activity In The Allowance For Credit Losses

A summary of the activity in the allowance for credit losses on loans and the liability for unfunded lending commitments during the three and nine months ended September 30, 2020 follows:


	For the Three Months Ended September 30						For the Nine Months Ended September 30
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
ALLOWANCE FOR CREDIT LOSSES ON LOANS
Balance at end of prior period	$	130,553	$	110,191	$	240,744	$	91,760	$	68,922	$	160,682
Adoption of ASU 2016-13	—		—		—		(29,711)		8,672		(21,039)
Balance at beginning of period	$	130,553	$	110,191	$	240,744	$	62,049	$	77,594	$	139,643
Provision for credit losses on loans	(1,935)		5,135		3,200		69,418		54,141		123,559
Deductions:
Loans charged off	357		10,292		10,649		4,159		32,127		36,286
Less recoveries on loans	163		2,902		3,065		1,116		8,328		9,444
Net loan charge-offs	194		7,390		7,584		3,043		23,799		26,842
Balance September 30, 2020	$	128,424	$	107,936	$	236,360	$	128,424	$	107,936	$	236,360
LIABILITY FOR UNFUNDED LENDING COMMITMENTS
Balance at end of prior period	$	34,052	$	1,247	$	35,299	$	399	$	676	$	1,075
Adoption of ASU 2016-13	—		—		—		16,057		33		16,090
Balance at beginning of period	$	34,052	$	1,247	$	35,299	$	16,456	$	709	$	17,165
Provision for credit losses on unfunded lending commitments	(60)		(39)		(99)		17,536		499		18,035
Balance September 30, 2020	$	33,992	$	1,208	$	35,200	$	33,992	$	1,208	$	35,200
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS	$	162,416	$	109,144	$	271,560	$	162,416	$	109,144	$	271,560

Summary Of Activity in the Allowance for Loan Losses

A summary of the activity in the allowance for loan losses during the three and nine months ended September 30, 2019 follows:


	For the Three Months Ended September 30						For the Nine Months Ended September 30
(In thousands)	Commercial		Personal Banking		Total		Commercial		Personal Banking		Total
Balance at beginning of period	$	91,808	$	69,374	$	161,182	$	92,869	$	67,063	$	159,932

Provision for loan losses	553		10,410		10,963		55		35,177		35,232
Deductions:
Loans charged off	490		13,990		14,480		1,436		42,233		43,669
Less recoveries on loans	199		2,818		3,017		582		8,605		9,187
Net loan charge-offs	291		11,172		11,463		854		33,628		34,482
Balance September 30, 2019	$	92,070	$	68,612	$	160,682	$	92,070	$	68,612	$	160,682

Aging Information On Past Due And Nonaccrual Loans

The following table provides aging information on the Company’s past due and accruing loans, in addition to the balances of loans on non-accrual status, at September 30, 2020 and December 31, 2019.


(In thousands)	Current or Less Than 30 Days Past Due		30 – 89 Days Past Due		90 Days Past Due and Still Accruing		Non-accrual		Total
September 30, 2020
Commercial:
Business	$	6,636,383	$	7,106	$	2,629	$	37,295	$	6,683,413
Real estate – construction and land	991,404		18,320		4		1		1,009,729
Real estate – business	2,987,992		4,137		—		1,063		2,993,192
Personal Banking:
Real estate – personal	2,743,260		6,029		2,667		1,911		2,753,867
Consumer	1,983,820		20,329		2,211		—		2,006,360
Revolving home equity	322,572		1,237		394		—		324,203
Consumer credit card	629,181		12,181		6,531		—		647,893
Overdrafts	2,080		190		—		—		2,270
Total	$	16,296,692	$	69,529	$	14,436	$	40,270	$	16,420,927
December 31, 2019
Commercial:
Business	$	5,545,104	$	12,064	$	792	$	7,489	$	5,565,449
Real estate – construction and land	882,826		13,046		3,503		2		899,377
Real estate – business	2,830,494		2,030		—		1,030		2,833,554
Personal Banking:
Real estate – personal	2,345,243		6,129		1,689		1,699		2,354,760
Consumer	1,928,082		34,053		2,010		—		1,964,145
Revolving home equity	347,258		1,743		250		—		349,251
Consumer credit card	742,659		10,703		11,615		—		764,977
Overdrafts	5,972		332		—		—		6,304
Total	$	14,627,638	$	80,100	$	19,859	$	10,220	$	14,737,817

Risk Category of Loans in Commercial Portfolio

The risk category of loans in the Commercial portfolio as of September 30, 2020 are as follows:


	Term Loans Amortized Cost Basis by Origination Year
(In thousands)	2020		2019		2018		2017		2016		Prior		Revolving Loans Amortized Cost Basis		Total
Business
Risk Rating:
Pass	$	2,394,434	$	1,097,498	$	518,966	$	356,416	$	186,992	$	307,681	$	1,535,511	$	6,397,498
Special mention	29,620		28,518		17,532		1,120		5,773		1,843		63,973		148,379
Substandard	16,118		26,401		2,139		2,849		3,608		13,879		35,247		100,241
Non-accrual	19,948		—		2,065		16		125		3,845		11,296		37,295
Total Business:	$	2,460,120	$	1,152,417	$	540,702	$	360,401	$	196,498	$	327,248	$	1,646,027	$	6,683,413
Real estate-construction
Risk Rating:
Pass	$	407,465	$	323,632	$	131,606	$	49,040	$	24,660	$	682	$	32,865	$	969,950
Special mention	—		—		10,107		14,555		—		—		—		24,662
Substandard	1,354		—		593		13,169		—		—		—		15,116
Non-accrual	1		—		—		—		—		—		—		1
Total Real estate-construction:	$	408,820	$	323,632	$	142,306	$	76,764	$	24,660	$	682	$	32,865	$	1,009,729
Real estate- business
Risk Rating:
Pass	$	713,079	$	698,287	$	384,214	$	283,843	$	329,613	$	238,663	$	46,224	$	2,693,923
Special mention	24,660		11,959		45,547		6,943		20,837		1,285		2		111,233
Substandard	57,938		6,099		11,228		57,364		17,306		33,472		3,566		186,973
Non-accrual	1		285		624		—		—		153		—		1,063
Total Real-estate business:	$	795,678	$	716,630	$	441,613	$	348,150	$	367,756	$	273,573	$	49,792	$	2,993,192
Commercial loans
Risk Rating:
Pass	$	3,514,978	$	2,119,417	$	1,034,786	$	689,299	$	541,265	$	547,026	$	1,614,600	$	10,061,371
Special mention	54,280		40,477		73,186		22,618		26,610		3,128		63,975		284,274
Substandard	75,410		32,500		13,960		73,382		20,914		47,351		38,813		302,330
Non-accrual	19,950		285		2,689		16		125		3,998		11,296		38,359
Total Commercial loans:	$	3,664,618	$	2,192,679	$	1,124,621	$	785,315	$	588,914	$	601,503	$	1,728,684	$	10,686,334

Credit Quality of the Commercial Loan Portfolio

Information about the credit quality of the Commercial loan portfolio as of December 31, 2019 follows:


Commercial Loans
(In thousands)	Business		Real Estate-Construction		Real Estate- Business		Total






December 31, 2019
Pass	$	5,393,928	$	856,364	$	2,659,827	$	8,910,119
Special mention	80,089		42,541		92,626		215,256
Substandard	83,943		470		80,071		164,484
Non-accrual	7,489		2		1,030		8,521
Total	$	5,565,449	$	899,377	$	2,833,554	$	9,298,380

Credit Quality of Personal Banking Loan Portfolio

The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided as of September 30, 2020 below:


	Term Loans Amortized Cost Basis by Origination Year
(In thousands)	2020		2019		2018		2017		2016		Prior		Revolving Loans Amortized Cost Basis		Total
Real estate-personal
Current to 90 days past due	$	897,007	$	532,003	$	238,092	$	227,499	$	247,754	$	595,713	$	11,221	$	2,749,289
Over 90 days past due	273		394		422		361		357		860		—		2,667
Non-accrual	—		195		129		45		121		1,421		—		1,911
Total Real estate-personal:	$	897,280	$	532,592	$	238,643	$	227,905	$	248,232	$	597,994	$	11,221	$	2,753,867
Consumer
Current to 90 days past due	$	446,909	$	380,399	$	188,186	$	137,253	$	90,236	$	104,466	$	656,700	$	2,004,149
Over 90 days past due	76		337		158		176		162		278		1,024		2,211

Total Consumer:	$	446,985	$	380,736	$	188,344	$	137,429	$	90,398	$	104,744	$	657,724	$	2,006,360
Revolving home equity
Current to 90 days past due	$	—	$	—	$	—	$	—	$	—	$	—	$	323,809	$	323,809
Over 90 days past due	—		—		—		—		—		—		394		394

Total Revolving home equity:	$	—	$	—	$	—	$	—	$	—	$	—	$	324,203	$	324,203
Consumer credit card
Current to 90 days past due	$	—	$	—	$	—	$	—	$	—	$	—	$	641,362	$	641,362
Over 90 days past due	—		—		—		—		—		—		6,531		6,531

Total Consumer credit card:	$	—	$	—	$	—	$	—	$	—	$	—	$	647,893	$	647,893
Overdrafts
Current to 90 days past due	$	2,270	$	—	$	—	$	—	$	—	$	—	$	—	$	2,270
Over 90 days past due	—		—		—		—		—		—		—		—

Total Overdrafts:	$	2,270	$	—	$	—	$	—	$	—	$	—	$	—	$	2,270
Personal banking loans
Current to 90 days past due	$	1,346,186	$	912,402	$	426,278	$	364,752	$	337,990	$	700,179	$	1,633,092	$	5,720,879
Over 90 days past due	349		731		580		537		519		1,138		7,949		11,803
Non-accrual	—		195		129		45		121		1,421		—		1,911
Total Personal banking loans:	$	1,346,535	$	913,328	$	426,987	$	365,334	$	338,630	$	702,738	$	1,641,041	$	5,734,593

Amortized Cost Basis of Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans as of September 30, 2020.


(In thousands)	Business Assets		Future Revenue Streams		Energy		Total
Commercial:
Business	$	18,843	$	3,616	$	14,276	$	36,734








Total	$	18,843	$	3,616	$	14,276	$	36,734

Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding

For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at September 30, 2020 and December 31, 2019 by FICO score.


Personal Banking Loans
	% of Loan Category
	Real Estate - Personal		Consumer		Revolving Home Equity		Consumer Credit Card
September 30, 2020
FICO score:
Under 600	1.0	%	2.4	%	1.4	%	5.2	%
600 - 659	2.1		3.9		2.5		12.9
660 - 719	8.5		14.5		7.3		32.2
720 - 779	25.7		25.6		22.6		27.5
780 and over	62.7		53.6		66.2		22.2
Total	100.0	%	100.0	%	100.0	%	100.0	%
December 31, 2019
FICO score:
Under 600	1.0	%	3.0	%	1.7	%	5.6	%
600 - 659	1.9		5.2		1.9		14.3
660 - 719	9.2		15.4		9.0		32.2
720 - 779	25.7		27.0		21.5		26.6
780 and over	62.2		49.4		65.9		21.3
Total	100.0	%	100.0	%	100.0	%	100.0	%

Additional Information about Troubled Debt Restructurings


(In thousands)		September 30, 2020		December 31, 2019
Accruing restructured loans:
	Commercial	$	50,921	$	55,934
	Assistance programs	8,208		8,365
	Consumer bankruptcy	3,101		3,592
	Other consumer	2,418		3,621
Non-accrual loans		8,513		7,938
Total troubled debt restructurings		$	73,161	$	79,450

Outstanding Balance Of Loans Classified As Troubled Debt Restructurings

The table below shows the balance of troubled debt restructurings by loan classification at September 30, 2020, in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal.


(In thousands)	September 30, 2020		Balance 90 days past due at any time during previous 12 months
Commercial:
Business	$	17,696	$	674
Real estate - construction and land	41		—
Real estate - business	40,596		—
Personal Banking:
Real estate - personal	3,278		252
Consumer	3,530		103
Revolving home equity	56		—
Consumer credit card	7,964		257
Total troubled debt restructurings	$	73,161	$	1,286

Investment In Impaired Loans

The table below shows the Company’s balances of impaired loans at December 31, 2019. These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings. These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. They are discussed further in the "Troubled debt restructurings" section above.


(In thousands)	Dec. 31, 2019
Non-accrual loans	$	10,220
Restructured loans (accruing)	71,512
Total impaired loans	$	81,732

Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology

The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2019, disaggregated on the basis of impairment methodology. Impaired loans evaluated under Accounting Standards Codification (ASC) 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans deemed to have similar risk characteristics, which are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20.


	Impaired Loans				All Other Loans
(In thousands)	Allowance for Loan Losses		Loans Outstanding		Allowance for Loan Losses		Loans Outstanding
December 31, 2019
Commercial	$	1,629	$	64,500	$	90,131	$	9,233,880
Personal Banking	1,117		17,232		67,805		5,422,205
Total	$	2,746	$	81,732	$	157,936	$	14,656,085

Additional Information About Impaired Loans Held

The following table provides additional information about impaired loans held by the Company at December 31, 2019, segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided.


(In thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance



















December 31, 2019
With no related allowance recorded:
Business	$	7,054	$	13,738	$	—





	$	7,054	$	13,738	$	—
With an allowance recorded:
Business	$	30,437	$	30,487	$	837
Real estate – construction and land	46		51		1
Real estate – business	26,963		27,643		791
Real estate – personal	4,729		5,968		258
Consumer	4,421		4,421		35
Revolving home equity	35		35		1
Consumer credit card	8,047		8,047		823
	$	74,678	$	76,652	$	2,746
Total	$	81,732	$	90,390	$	2,746

Total Average Impaired Loans

Total average impaired loans for the three and nine month periods ended September 30, 2019 are shown in the table below.


(In thousands)	Commercial		Personal Banking		Total
Average Impaired Loans:








For the three months ended September 30, 2019
Non-accrual loans	$	9,655	$	1,903	$	11,558
Restructured loans (accruing)	53,517		15,644		69,161
Total	$	63,172	$	17,547	$	80,719
For the nine months ended September 30, 2019
Non-accrual loans	$	9,881	$	2,074	$	11,955
Restructured loans (accruing)	48,248		15,605		63,853
Total	$	58,129	$	17,679	$	75,808

Interest Income Recognized On Impaired Loans

The table below shows interest income recognized during the three and nine month periods ended September 30, 2019, respectively, for impaired loans held at the end of each period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section above.


	For the Three Months Ended September 30		For the Nine Months Ended September 30
(In thousands)	2019		2019
Interest income recognized on impaired loans:
Business	$	222	$	665
Real estate – construction and land	1		2
Real estate – business	363		1,088
Real estate – personal	31		92
Consumer	76		227
Revolving home equity	1		2
Consumer credit card	181		542
Total	$	875	$	2,618

Investment Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investment Securities [Abstract]

Summary Investment Holdings


(In thousands)	September 30, 2020		December 31, 2019
Available for sale debt securities	$	11,539,061	$	8,571,626
Trading debt securities	25,805		28,161
Equity securities:
Readily determinable fair value	2,803		2,929
No readily determinable fair value	1,400		1,280
Other:
Federal Reserve Bank stock	34,070		33,770
Federal Home Loan Bank stock	10,000		10,000
Private equity investments	78,462		94,122
Total investment securities (1)	$	11,691,601	$	8,741,888

(1)Accrued interest receivable totaled $39.7 million at September 30, 2020 and was included within other assets on the consolidated balance sheet.

Summary Of Available For Sale Investment Securities By Maturity Groupings

A summary of the available for sale debt securities by maturity groupings as of September 30, 2020 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as the FHLMC, FNMA, and GNMA, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards,

automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral.


(In thousands)	Amortized Cost		Fair Value
U.S. government and federal agency obligations:
Within 1 year	$	59,367	$	59,706
After 1 but within 5 years	489,042		521,797
After 5 but within 10 years	225,159		253,555

Total U.S. government and federal agency obligations	773,568		835,058
Government-sponsored enterprise obligations:
Within 1 year	55,185		54,770


After 10 years	35,818		40,531
Total government-sponsored enterprise obligations	91,003		95,301
State and municipal obligations:
Within 1 year	68,787		69,179
After 1 but within 5 years	764,831		803,168
After 5 but within 10 years	597,276		624,525
After 10 years	464,375		472,272
Total state and municipal obligations	1,895,269		1,969,144
Mortgage and asset-backed securities:
Agency mortgage-backed securities	5,919,500		6,081,802
Non-agency mortgage-backed securities	324,266		332,970
Asset-backed securities	1,633,988		1,658,579
Total mortgage and asset-backed securities	7,877,754		8,073,351
Other debt securities:
Within 1 year	23,565		23,701
After 1 but within 5 years	252,180		264,096
After 5 but within 10 years	240,814		249,136
After 10 years	28,195		29,274
Total other debt securities	544,754		566,207
Total available for sale debt securities	$	11,182,348	$	11,539,061

Cash Flow Model Inputs Used To Calculate Credit Losses

Significant inputs to the cash flow models used at September 30, 2020 to quantify credit losses included the following:


Significant Inputs	Range
Prepayment CPR	0%	-	25%
Projected cumulative default	13%	-	54%
Credit support	0%	-	20%
Loss severity	7%	-	63%

Securities With Unrealized Losses And Length Of Impairment Period

The following table summarizes debt securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded at September 30, 2020, aggregated by major security type and length of impairment period.


	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
September 30, 2020

Government-sponsored enterprise obligations	$	14,489	$	503	$	—	$	—	$	14,489	$	503
State and municipal obligations	84,876		578		—		—		84,876		578
Mortgage and asset-backed securities:
Agency mortgage-backed securities	287,620		5,402		—		—		287,620		5,402
Non-agency mortgage-backed securities	68,513		234		1,069		45		69,582		279
Asset-backed securities	97,592		1,100		245,198		6,196		342,790		7,296
Total mortgage and asset-backed securities	453,725		6,736		246,267		6,241		699,992		12,977
Other debt securities	43,600		493		—		—		43,600		493
Total	$	596,690	$	8,310	$	246,267	$	6,241	$	842,957	$	14,551

Debt securities available for sale in an unrealized loss position, aggregated by major security type and length of impairment period, are as follows:


	Less than 12 months				12 months or longer				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2019
U.S. government and federal agency obligations	$	31,787	$	21	$	25,405	$	21	$	57,192	$	42
Government-sponsored enterprise obligations	6,155		187		—		—		6,155		187
State and municipal obligations	6,700		31		1,554		1		8,254		32
Mortgage and asset-backed securities:
Agency mortgage-backed securities	652,352		5,306		147,653		867		800,005		6,173
Non-agency mortgage-backed securities	102,931		254		189,747		451		292,678		705
Asset-backed securities	330,876		3,610		152,461		2,108		483,337		5,718
Total mortgage and asset-backed securities	1,086,159		9,170		489,861		3,426		1,576,020		12,596
Other debt securities	5,496		4		997		3		6,493		7
Total	$	1,136,297	$	9,413	$	517,817	$	3,451	$	1,654,114	$	12,864

Available For Sale Securities Unrealized Gains And Losses By Security Type

For debt securities classified as available for sale, the following table shows the amortized cost, fair value, and allowance for credit losses of securities available for sale at September 30, 2020 and the corresponding amounts of gross unrealized gains and losses (pre-tax) in AOCI, by security type.


(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Fair Value
September 30, 2020
U.S. government and federal agency obligations	$	773,568	$	61,490	$	—	$	—	$	835,058
Government-sponsored enterprise obligations	91,003		4,801		(503)		—		95,301
State and municipal obligations	1,895,269		74,453		(578)		—		1,969,144
Mortgage and asset-backed securities:
Agency mortgage-backed securities	5,919,500		167,704		(5,402)		—		6,081,802
Non-agency mortgage-backed securities	324,266		8,983		(279)		—		332,970
Asset-backed securities	1,633,988		31,887		(7,296)		—		1,658,579
Total mortgage and asset-backed securities	7,877,754		208,574		(12,977)		—		8,073,351
Other debt securities	544,754		21,946		(493)		—		566,207
Total	$	11,182,348	$	371,264	$	(14,551)	$	—	$	11,539,061

For debt securities classified as available for sale, the following table shows the amortized cost and fair value of securities available-for-sale at December 31, 2019 and the corresponding amounts of gross unrealized gains and losses (pre-tax) in AOCI, by security type.


(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2019
U.S. government and federal agency obligations	$	827,861	$	23,957	$	(42)	$	851,776
Government-sponsored enterprise obligations	138,734		730		(187)		139,277
State and municipal obligations	1,225,532		42,427		(32)		1,267,927
Mortgage and asset-backed securities:
Agency mortgage-backed securities	3,893,247		50,890		(6,173)		3,937,964
Non-agency mortgage-backed securities	796,451		14,036		(705)		809,782
Asset-backed securities	1,228,151		11,056		(5,718)		1,233,489
Total mortgage and asset-backed securities	5,917,849		75,982		(12,596)		5,981,235
Other debt securities	325,555		5,863		(7)		331,411
Total	$	8,435,531	$	148,959	$	(12,864)	$	8,571,626

Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses

The following tables present proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.


	For the Nine Months Ended September 30
(In thousands)	2020		2019
Proceeds from sales of securities:
Available for sale debt securities	$	574,374	$	368,939
Equity securities	2		3,459
Other	—		7,243
Total proceeds	$	574,376	$	379,641

Investment securities gains (losses), net:
Available for sale debt securities:

Gains realized on sales	$	16,965	$	2,287
Losses realized on sales	—		(1,559)
Other-than-temporary impairment recognized on debt securities	—		(133)
Equity securities:

Gains realized on sales	2		2,865

Fair value adjustments, net	(126)		318
Other:
Gains realized on sales	—		1,094

Fair value adjustments, net	(18,116)		(998)
Total investment securities gains (losses), net	$	(1,275)	$	3,874

Goodwill And Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Intangible Assets With Estimable Useful Lives

The following table presents information about the Company's intangible assets which have estimable useful lives.


	September 30, 2020								December 31, 2019
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Valuation Allowance		Net Amount		Gross Carrying Amount		Accumulated Amortization		Valuation Allowance		Net Amount
Amortizable intangible assets:
Core deposit premium	$	31,270	$	(29,818)	$	—	$	1,452	$	31,270	$	(29,485)	$	—	$	1,785
Mortgage servicing rights	13,983		(6,102)		(2,150)		5,731		12,942		(4,866)		(327)		7,749
Total	$	45,253	$	(35,920)	$	(2,150)	$	7,183	$	44,212	$	(34,351)	$	(327)	$	9,534

Schedule of Estimated Annual Amortization Expense

The following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of September 30, 2020. The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions.


(In thousands)
2020	$	2,143
2021	1,243
2022	1,013
2023	834
2024	689

Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets

Changes in the carrying amount of goodwill and net other intangible assets for the nine month period ended September 30, 2020 are as follows:


(In thousands)	Goodwill		Core Deposit Premium		Mortgage Servicing Rights
Balance January 1, 2020	$	138,921	$	1,785	$	7,749

Originations	—		—		1,041
Amortization	—		(333)		(1,236)
Impairment	—		—		(1,823)
Balance September 30, 2020	$	138,921	$	1,452	$	5,731

Schedule Of Goodwill Allocated By Operating Segments

Goodwill allocated to the Company’s operating segments at September 30, 2020 and December 31, 2019 is shown below.


(In thousands)
Consumer segment	$	70,721
Commercial segment	67,454
Wealth segment	746
Total goodwill	$	138,921

Leases (Tables)

9 Months Ended

Sep. 30, 2020

Leases [Abstract]

Lessor, Components of Lease Income [Table Text Block]

The following table provides the components of lease income.


	For the Three Months Ended September 30				For the Nine Months Ended September 30
(in thousands)	2020		2019		2020		2019
Direct financing and sales-type leases	$	6,437	$	6,092	$	19,099	$	17,988
Operating leases(a)	2,270		1,984		6,491		5,816
Total lease income	$	8,707	$	8,076	$	25,590	$	23,804

(a) Includes rent from Tower Properties Company, a related party, of $19 thousand for the three month periods ended September 30, 2020 and 2019, and $57 thousand and $56 thousand, respectively, for the nine months ended September 30, 2020 and 2019.

Pension (Tables)

9 Months Ended

Sep. 30, 2020

Pension [Abstract]

Net Pension Cost

The amount of net pension cost is shown in the table below:


	For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands)	2020		2019		2020		2019
Service cost - benefits earned during the period	$	93	$	159	$	295	$	477
Interest cost on projected benefit obligation	818		1,065		2,463		3,195
Expected return on plan assets	(1,317)		(1,196)		(3,911)		(3,589)
Amortization of prior service cost	(67)		(68)		(203)		(203)
Amortization of unrecognized net loss	503		586		1,587		1,757
Net periodic pension cost	$	30	$	546	$	231	$	1,637

Common Stock (Tables)

9 Months Ended

Sep. 30, 2020

Common Stock [Abstract]

Summary Of Components Used To Calculate Basic And Diluted Income Per Share

Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 13.


	For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands, except per share data)	2020		2019		2020		2019
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	132,448	$	109,242	$	224,168	$	314,351
Less preferred stock dividends	7,466		2,250		11,966		6,750
Net income available to common shareholders	124,982		106,992		212,202		307,601
Less income allocated to nonvested restricted stock	1,173		1,040		1,996		2,996
Net income allocated to common stock	$	123,809	$	105,952	$	210,206	$	304,605
Weighted average common shares outstanding	110,720		112,982		110,848		114,475
Basic income per common share	$	1.12	$	.93	$	1.90	$	2.65
Diluted income per common share:
Net income available to common shareholders	$	124,982	$	106,992	$	212,202	$	307,601
Less income allocated to nonvested restricted stock	1,170		1,039		1,993		2,991
Net income allocated to common stock	$	123,812	$	105,953	$	210,209	$	304,610
Weighted average common shares outstanding	110,720		112,982		110,848		114,475
Net effect of the assumed exercise of stock-based awards - based on
the treasury stock method using the average market price for the respective periods	179		267		209		284
Weighted average diluted common shares outstanding	110,899		113,249		111,057		114,759
Diluted income per common share	$	1.11	$	.93	$	1.89	$	2.65

Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule Of Accumulated Other Comprehensive Income

The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale debt securities. Another component is the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. The remaining component is gains and losses in fair value on certain interest rate floors that have been designated as cash flow hedging instruments. Information about unrealized gains and losses on securities can be found in Note 3, and information about unrealized gains and losses on cash flow hedge derivatives is located in Note 11.

The Company adopted ASU 2016-13 (CECL) on January 1, 2020, which changed the impairment model for available for sale debt securities. The new standard requires an allowance for credit losses when the present value of the cash flows expected to be collected is less than the security's amortized cost basis. See further discussion of the Company's CECL adoption in Note 1 and Note 3 to the consolidated financial statements. Further, the new standard superceded the guidance related to other-than-temporary impairment (OTTI), including the requirement to separately disclose the unrealized gains and losses on securities with OTTI. Prior to the Company's adoption of CECL, unrealized gains and losses on debt securities for which an OTTI has been recorded in current earnings were shown separately below. As a result of adopting CECL, the table below will separately disclose unrealized gains and losses on debt securities for which an allowance for credit losses has been recorded. During the first nine months of 2020, there were no securities for which an allowance for credit losses was recorded.


	Unrealized Gains (Losses) on Securities (1)				Pension Loss		Unrealized Gains (Losses) on Cash Flow Hedge Derivatives (2)		Total Accumulated Other Comprehensive Income (Loss)
(In thousands)	OTTI		Other
Balance January 1, 2020	$	3,264	$	98,809	$	(21,940)	$	30,311	$	110,444

Adoption of ASU 2016-13	(3,264)		3,264		—		—		—
Balance January 1, 2020, adjusted	—		102,073		(21,940)		30,311		110,444
Other comprehensive income before reclassifications to current earnings	—		237,583		—		94,702		332,285
Amounts reclassified to current earnings from accumulated other comprehensive income	—		(16,965)		1,384		(6,050)		(21,631)
Current period other comprehensive income, before tax	—		220,618		1,384		88,652		310,654
Income tax expense	—		(55,154)		(346)		(22,163)		(77,663)
Current period other comprehensive income, net of tax	—		165,464		1,038		66,489		232,991

Balance September 30, 2020	$	—	$	267,537	$	(20,902)	$	96,800	$	343,435
Balance January 1, 2019	$	3,861	$	(52,278)	$	(23,107)	$	6,855	$	(64,669)


Other comprehensive income (loss) before reclassifications to current earnings	(709)		229,288		—		46,165		274,744
Amounts reclassified to current earnings from accumulated other comprehensive income	133		(728)		1,554		2,751		3,710
Current period other comprehensive income (loss), before tax	(576)		228,560		1,554		48,916		278,454
Income tax (expense) benefit	144		(57,139)		(388)		(12,229)		(69,612)
Current period other comprehensive income (loss), net of tax	(432)		171,421		1,166		36,687		208,842
Transfer of unrealized gain on securities for which impairment was not previously recognized	35		(35)		—		—		—
Balance September 30, 2019	$	3,464	$	119,108	$	(21,941)	$	43,542	$	144,173

(1) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.

(2) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income.

Segments (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Schedule Of Financial Information By Segment

The following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below.


(In thousands)	Consumer		Commercial		Wealth		Segment Totals		Other/Elimination		Consolidated Totals
Three Months Ended September 30, 2020
Net interest income	$	80,944	$	111,807	$	15,310	$	208,061	$	7,901	$	215,962
Provision for credit losses	(7,654)		(200)		13		(7,841)		4,740		(3,101)
Non-interest income	37,116		47,920		47,701		132,737		(3,165)		129,572
Investment securities gains, net	—		—		—		—		16,155		16,155
Non-interest expense	(73,074)		(78,283)		(31,013)		(182,370)		(8,488)		(190,858)
Income before income taxes	$	37,332	$	81,244	$	32,011	$	150,587	$	17,143	$	167,730
Nine Months Ended September 30, 2020
Net interest income	$	241,195	$	300,307	$	41,686	$	583,188	$	36,896	$	620,084
Provision for credit losses	(23,885)		(3,122)		10		(26,997)		(114,596)		(141,593)
Non-interest income	107,492		143,747		139,700		390,939		(20,189)		370,750
Investment securities losses, net	—		—		—		—		(1,275)		(1,275)
Non-interest expense	(225,791)		(237,350)		(93,156)		(556,297)		(15,771)		(572,068)
Income before income taxes	$	99,011	$	203,582	$	88,240	$	390,833	$	(114,935)	$	275,898
Three Months Ended September 30, 2019
Net interest income	$	80,111	$	85,402	$	11,525	$	177,038	$	26,474	$	203,512
Provision for loan losses	(10,757)		(345)		(197)		(11,299)		336		(10,963)
Non-interest income	36,049		53,462		45,721		135,232		(2,489)		132,743
Investment securities gains, net	—		—		—		—		4,909		4,909
Non-interest expense	(73,872)		(76,105)		(30,248)		(180,225)		(10,795)		(191,020)
Income before income taxes	$	31,531	$	62,414	$	26,801	$	120,746	$	18,435	$	139,181
Nine Months Ended September 30, 2019
Net interest income	$	236,215	$	256,649	$	35,662	$	528,526	$	90,108	$	618,634
Provision for loan losses	(33,061)		(1,053)		(165)		(34,279)		(953)		(35,232)
Non-interest income	98,840		151,655		133,556		384,051		(2,809)		381,242
Investment securities gains, net	—		—		—		—		3,874		3,874
Non-interest expense	(223,355)		(231,790)		(91,708)		(546,853)		(25,371)		(572,224)
Income before income taxes	$	78,639	$	175,461	$	77,345	$	331,445	$	64,849	$	396,294

Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instrument Detail [Abstract]

Schedule Of Notional Amounts Of Derivative Instruments


(In thousands)	September 30, 2020		December 31, 2019
Interest rate swaps	$	2,425,837	$	2,606,181
Interest rate floors	500,000		1,500,000
Interest rate caps	113,495		59,316
Credit risk participation agreements	365,611		316,225
Foreign exchange contracts	9,293		10,936
Mortgage loan commitments	60,311		13,755
Mortgage loan forward sale contracts	9,451		1,943
Forward TBA contracts	64,500		17,500
Total notional amount	$	3,548,498	$	4,525,856

Schedule Of Fair Values Of Derivative Instruments

The fair values of the Company's derivative instruments, whose notional amounts are listed above, are shown in the table below. Information about the valuation methods used to determine fair value is provided in Note 17 on Fair Value Measurements in the 2019 Annual Report on Form 10-K.

The Company's policy is to present its derivative assets and derivative liabilities on a gross basis in its consolidated balance sheets and these are reported in other assets and other liabilities. Certain collateral posted to and from the Company's clearing counterparty has been applied to the fair values of the cleared swaps, such that at September 30, 2020 in the table below, there were no reductions to the positive fair values of cleared swaps and the negative fair values of cleared swaps were reduced by $77.8 million. At December 31, 2019, the positive fair values of cleared swaps were reduced by $617 thousand and the negative fair values of cleared swaps were reduced by $28.5 million.


	Asset Derivatives				Liability Derivatives
	Sept. 30, 2020		Dec. 31, 2019		Sept. 30, 2020		Dec. 31, 2019
(In thousands)	Fair Value				Fair Value
Derivatives designated as hedging instruments:
Interest rate floors	$	47,306	$	67,192	$	—	$	—
Total derivatives designated as hedging instruments	$	47,306	$	67,192	$	—	$	—
Derivative instruments not designated as hedging instruments:
Interest rate swaps	$	96,866	$	37,774	$	(18,981)	$	(9,916)
Interest rate caps	1		4		(1)		(4)
Credit risk participation agreements	440		140		(1,185)		(230)
Foreign exchange contracts	32		97		(50)		(32)
Mortgage loan commitments	3,137		459		—		—
Mortgage loan forward sale contracts	29		6		(6)		(2)
Forward TBA contracts	39		2		(147)		(35)
Total derivatives not designated as hedging instruments	$	100,544	$	38,482	$	(20,370)	$	(10,219)
Total	$	147,850	$	105,674	$	(20,370)	$	(10,219)

Summary of Cash Flow Hedge Activity [Table Text Block]

The pre-tax effects of derivative instruments on the consolidated statements of income are shown in the tables below.


	Amount of Gain or (Loss) Recognized in OCI						Location of Gain (Loss) Reclassified from AOCI into Income	Amount of Gain (Loss) Reclassified from AOCI into Income

(In thousands)	Total		Included Component		Excluded Component			Total		Included Component		Excluded Component
For the Three Months Ended September 30, 2020
Derivatives in cash flow hedging relationships:
Interest rate floors	$	(4,481)	$	(4,087)	$	(394)	Interest and fees on loans	$	4,163	$	5,509	$	(1,346)
Total	$	(4,481)	$	(4,087)	$	(394)	Total	$	4,163	$	5,509	$	(1,346)
For the Nine Months Ended September 30, 2020
Derivatives in cash flow hedging relationships:
Interest rate floors	$	94,702	$	121,621	$	(26,919)	Interest and fees on loans	$	6,050	$	9,458	$	(3,408)
Total	$	94,702	$	121,621	$	(26,919)	Total	$	6,050	$	9,458	$	(3,408)
For the Three Months Ended September 30, 2019
Derivatives in cash flow hedging relationships:
Interest rate floors	$	17,760	$	31,422	$	(13,662)	Interest and fees on loans	$	(1,042)	$	—	$	(1,042)
Total	$	17,760	$	31,422	$	(13,662)	Total	$	(1,042)	$	—	$	(1,042)
For the Nine Months Ended September 30, 2019
Derivatives in cash flow hedging relationships:
Interest rate floors	$	46,165	$	77,559	$	(31,394)	Interest and fees on loans	$	(2,751)	$	—	$	(2,751)
Total	$	46,165	$	77,559	$	(31,394)	Total	$	(2,751)	$	—	$	(2,751)

Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income


	Location of Gain or (Loss) Recognized in Income on Derivatives	Amount of Gain or (Loss) Recognized in Income on Derivatives
		For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands)		2020		2019		2020		2019



Derivative instruments:
Interest rate swaps	Other non-interest income	$	81	$	1,519	$	369	$	2,646
Interest rate caps	Other non-interest income	1		—		20		—
Credit risk participation agreements	Other non-interest income	(87)		37		153		78
Foreign exchange contracts	Other non-interest income	—		(5)		(82)		(2)
Mortgage loan commitments	Loan fees and sales	589		(112)		2,678		287
Mortgage loan forward sale contracts	Loan fees and sales	20		(2)		19		1
Forward TBA contracts	Loan fees and sales	(709)		(1,412)		(482)		(819)
Total		$	(105)	$	25	$	2,675	$	2,191

Balance Sheet Offsetting, Derivatives [Table Text Block]


							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Collateral Received/Pledged		Net Amount
September 30, 2020
Assets:
Derivatives subject to master netting agreements	$	144,440	$	—	$	144,440	$	(9,933)	$	(37,441)	$	97,066
Derivatives not subject to master netting agreements	3,410		—		3,410
Total derivatives	$	147,850	$	—	$	147,850
Liabilities:
Derivatives subject to master netting agreements	$	19,915	$	—	$	19,915	$	(9,933)	$	(8,719)	$	1,263
Derivatives not subject to master netting agreements	455		—		455
Total derivatives	$	20,370	$	—	$	20,370
December 31, 2019
Assets:
Derivatives subject to master netting agreements	$	105,147	$	—	$	105,147	$	(8,104)	$	(59,525)	$	37,518
Derivatives not subject to master netting agreements	527		—		527
Total derivatives	$	105,674	$	—	$	105,674
Liabilities:
Derivatives subject to master netting agreements	$	10,083	$	—	$	10,083	$	(8,104)	$	(437)	$	1,542
Derivatives not subject to master netting agreements	136		—		136
Total derivatives	$	10,219	$	—	$	10,219

Resale and Repurchase Agreements (Tables)

9 Months Ended

Sep. 30, 2020

Resale and Repurchase Agreements [Abstract]

Resale and Repurchase Agreements [Table Text Block]


							Gross Amounts Not Offset in the Balance Sheet
(In thousands)	Gross Amount Recognized		Gross Amounts Offset in the Balance Sheet		Net Amounts Presented in the Balance Sheet		Financial Instruments Available for Offset		Securities Collateral Received/Pledged		Net Amount
September 30, 2020
Total resale agreements, subject to master netting arrangements	$	1,050,000	$	(200,000)	$	850,000	$	—	$	(850,000)	$	—
Total repurchase agreements, subject to master netting arrangements	1,846,294		(200,000)		1,646,294		—		(1,646,294)		—
December 31, 2019
Total resale agreements, subject to master netting arrangements	$	1,050,000	$	(200,000)	$	850,000	$	—	$	(850,000)	$	—
Total repurchase agreements, subject to master netting arrangements	2,030,737		(200,000)		1,830,737		—		(1,830,737)		—

Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]


	Remaining Contractual Maturity of the Agreements
(In thousands)	Overnight and continuous		Up to 90 days		Greater than 90 days		Total
September 30, 2020
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	146,935	$	—	$	—	$	146,935
Government-sponsored enterprise obligations	21,386		—		—		21,386

Agency mortgage-backed securities	1,167,467		58,729		214,896		1,441,092
Non-agency mortgage-backed securities	98,651		—		—		98,651
Asset-backed securities	103,861		—		—		103,861
Other debt securities	34,369		—		—		34,369
Total repurchase agreements, gross amount recognized	$	1,572,669	$	58,729	$	214,896	$	1,846,294
December 31, 2019
Repurchase agreements, secured by:
U.S. government and federal agency obligations	$	526,283	$	—	$	—	$	526,283
Government-sponsored enterprise obligations	32,575		—		—		32,575

Agency mortgage-backed securities	973,774		48,517		227,802		1,250,093
Non-agency mortgage-backed securities	71,399		—		—		71,399
Asset-backed securities	60,012		40,000		—		100,012
Other debt securities	50,375		—		—		50,375
Total repurchase agreements, gross amount recognized	$	1,714,418	$	88,517	$	227,802	$	2,030,737

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary Of The Status Of Nonvested Share Awards

A summary of the status of the Company’s nonvested share awards as of September 30, 2020, and changes during the nine month period then ended, is presented below.


	Shares	Weighted Average Grant Date Fair Value
Nonvested at January 1, 2020	1,104,211	$47.57
Granted	218,257	64.22
Vested	(275,070)	33.97
Forfeited	(6,730)	55.42

Nonvested at September 30, 2020	1,040,668	$54.61

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The current year per share average fair value and the model assumptions are shown in the table below.


Weighted per share average fair value at grant date	$10.12
Assumptions:
Dividend yield	1.7	%
Volatility	20.2	%
Risk-free interest rate	1.0	%
Expected term	5.8 years

Summary Of SAR Activity

A summary of SAR activity during the first nine months of 2020 is presented below.


(Dollars in thousands, except per share data)	Rights	Weighted Average Exercise Price	Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2020	1,049,816	$43.55
Granted	103,210	63.18
Forfeited	(5,600)	58.15
Expired	(150)	57.07
Exercised	(150,029)	34.52
Outstanding at September 30, 2020	997,247	$46.86	6.4 years	$	10,582

Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following table disaggregates non-interest income subject to ASU 2014-09 by major product line.


	Three Months Ended September 30				Nine Months Ended September 30
(In thousands)	2020		2019		2020		2019
Bank card transaction fees	$	37,873	$	44,510	$	111,818	$	126,800
Trust fees	40,769		39,592		118,676		115,223
Deposit account charges and other fees	23,107		24,032		69,063		71,009
Consumer brokerage services	4,011		4,030		11,099		11,665
Other non-interest income	7,566		9,809		23,718		27,003
Total non-interest income from contracts with customers	113,326		121,973		334,374		351,700
Other non-interest income (1)	16,246		10,770		36,376		29,542
Total non-interest income	$	129,572	$	132,743	$	370,750	$	381,242

(1) This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions.

Contract with Customer, Asset and Liability [Table Text Block]

The following table presents the opening and closing receivable balances for the nine month periods ended September 30, 2020 and 2019 for the Company’s significant revenue categories subject to ASU 2014-09.


(In thousands)	September 30, 2020		December 31, 2019		September 30, 2019		December 31, 2018
Bank card transaction fees	$	11,501	$	13,915	$	10,871	$	13,035
Trust fees	2,122		2,093		2,666		2,721
Deposit account charges and other fees	5,839		6,523		5,154		6,107
Consumer brokerage services	476		596		655		559

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Measurements [Abstract]

Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis

The table below presents the September 30, 2020 and December 31, 2019 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first nine months of 2020 or the year ended December 31, 2019.


			Fair Value Measurements Using
(In thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2020
Assets:
Residential mortgage loans held for sale	$	35,076	$	—	$	35,076	$	—
Available for sale debt securities:
U.S. government and federal agency obligations	835,058		835,058		—		—
Government-sponsored enterprise obligations	95,301		—		95,301		—
State and municipal obligations	1,969,144		—		1,961,278		7,866
Agency mortgage-backed securities	6,081,802		—		6,081,802		—
Non-agency mortgage-backed securities	332,970		—		332,970		—
Asset-backed securities	1,658,579		—		1,658,579		—
Other debt securities	566,207		—		566,207		—
Trading debt securities	25,805		—		25,805		—
Equity securities	2,803		2,803		—		—
Private equity investments	78,462		—		—		78,462
Derivatives *	147,850		—		144,273		3,577
Assets held in trust for deferred compensation plan	17,294		17,294		—		—
Total assets	11,846,351		855,155		10,901,291		89,905
Liabilities:
Derivatives *	20,370		—		19,185		1,185
Liabilities held in trust for deferred compensation plan	17,294		17,294		—		—
Total liabilities	$	37,664	$	17,294	$	19,185	$	1,185
December 31, 2019
Assets:
Residential mortgage loans held for sale	$	9,181	$	—	$	9,181	$	—
Available for sale debt securities:
U.S. government and federal agency obligations	851,776		851,776		—		—
Government-sponsored enterprise obligations	139,277		—		139,277		—
State and municipal obligations	1,267,927		—		1,258,074		9,853
Agency mortgage-backed securities	3,937,964		—		3,937,964		—
Non-agency mortgage-backed securities	809,782		—		809,782		—
Asset-backed securities	1,233,489		—		1,233,489		—
Other debt securities	331,411		—		331,411		—
Trading debt securities	28,161		—		28,161		—
Equity securities	2,929		2,929		—		—
Private equity investments	94,122		—		—		94,122
Derivatives *	105,674		—		105,075		599
Assets held in trust for deferred compensation plan	16,518		16,518		—		—
Total assets	8,828,211		871,223		7,852,414		104,574
Liabilities:
Derivatives *	10,219		—		9,989		230
Liabilities held in trust for deferred compensation plan	16,518		16,518		—		—
Total liabilities	$	26,737	$	16,518	$	9,989	$	230

* The fair value of each class of derivative is shown in Note 11.

Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis

The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations		Private Equity Investments		Derivatives		Total
For the three months ended September 30, 2020
Balance June 30, 2020	$	9,490	$	73,846	$	1,888	$	85,224
Total gains or losses (realized/unrealized):
Included in earnings	—		2,389		504		2,893
Included in other comprehensive income *	271		—		—		271
Investment securities called	(2,000)		—		—		(2,000)
Discount accretion	105		—		—		105
Purchases of private equity investments	—		2,522		—		2,522
Sale/pay down of private equity investments	—		(295)		—		(295)



Balance September 30, 2020	$	7,866	$	78,462	$	2,392	$	88,720
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	—	$	2,409	$	3,050	$	5,459
Total gains or losses for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	258	$	—	$	—	$	258
For the nine months ended September 30, 2020
Balance January 1, 2020	$	9,853	$	94,122	$	369	$	104,344
Total gains or losses (realized/unrealized):
Included in earnings	—		(18,116)		2,832		(15,284)
Included in other comprehensive income *	(101)		—		—		(101)
Investment securities called	(2,000)		—		—		(2,000)
Discount accretion	114		—		—		114
Purchases of private equity investments	—		2,791		—		2,791
Sale/pay down of private equity investments	—		(364)		—		(364)
Capitalized interest/dividends	—		29		—		29

Sale of risk participation agreement	—		—		(809)		(809)
Balance September 30, 2020	$	7,866	$	78,462	$	2,392	$	88,720
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	—	$	(18,096)	$	3,262	$	(14,834)
Total gains or losses for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2020	$	(52)	$	—	$	—	$	(52)


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands)	State and Municipal Obligations		Private Equity Investments		Derivatives		Total
For the three months ended September 30, 2019
Balance June 30, 2019	$	11,641	$	86,411	$	883	$	98,935
Total gains or losses (realized/unrealized):
Included in earnings	—		2,020		(75)		1,945
Included in other comprehensive income *	(65)		—		—		(65)
Investment securities called	(1,715)		—		—		(1,715)
Discount accretion	36		—		—		36
Purchases of private equity investments	—		5,010		—		5,010


Purchase of risk participation agreement	—		—		200		200
Sale of risk participation agreement	—		—		(241)		(241)
Balance September 30, 2019	$	9,897	$	93,441	$	767	$	104,105
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2019	$	—	$	2,020	$	860	$	2,880

For the nine months ended September 30, 2019
Balance January 1, 2019	$	14,158	$	85,659	$	490	$	100,307
Total gains or losses (realized/unrealized):
Included in earnings	—		(998)		365		(633)
Included in other comprehensive income *	294		—		—		294
Investment securities called	(4,635)		—		—		(4,635)
Discount accretion	80		—		—		80
Purchases of private equity investments	—		14,899		—		14,899
Sale/pay down of private equity investments	—		(6,150)		—		(6,150)
Capitalized interest/dividends	—		31		—		31
Purchase of risk participation agreement	—		—		226		226
Sale of risk participation agreement	—		—		(314)		(314)
Balance September 30, 2019	$	9,897	$	93,441	$	767	$	104,105
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2019	$	—	$	(2,448)	$	916	$	(1,532)

* Included in "net unrealized gains (losses) on other securities" in the consolidated statements of comprehensive income.

Summary Of Gains And Losses On Level 3 Assets And Liabilities

Gains and losses included in earnings for the Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income:


(In thousands)	Loan Fees and Sales		Other Non-Interest Income		Investment Securities Gains (Losses), Net		Total
For the three months ended September 30, 2020
Total gains or losses included in earnings	$	591	$	(87)	$	2,389	$	2,893
Change in unrealized gains or losses relating to assets still held at September 30, 2020	$	3,137	$	(87)	$	2,409	$	5,459
For the nine months ended September 30, 2020
Total gains or losses included in earnings	$	2,679	$	153	$	(18,116)	$	(15,284)
Change in unrealized gains or losses relating to assets still held at September 30, 2020	$	3,137	$	125	$	(18,096)	$	(14,834)
For the three months ended September 30, 2019
Total gains or losses included in earnings	$	(112)	$	37	$	2,020	$	1,945
Change in unrealized gains or losses relating to assets still held at September 30, 2019	$	823	$	37	$	2,020	$	2,880
For the nine months ended September 30, 2019
Total gains or losses included in earnings	$	287	$	78	$	(998)	$	(633)
Change in unrealized gains or losses relating to assets still held at September 30, 2019	$	823	$	93	$	(2,448)	$	(1,532)

Summary Of Quantitative Information About Level 3 Fair Value Measurements

The Company's significant Level 3 measurements, which employ unobservable inputs that are readily quantifiable, pertain to auction rate securities (ARS), investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $7.9 million at September 30, 2020, while private equity investments, included in other securities, totaled $78.5 million.

Information about these inputs is presented in the table below.


Quantitative Information about Level 3 Fair Value Measurements						Weighted
	Valuation Technique	Unobservable Input	Range			Average*
Auction rate securities	Discounted cash flow	Estimated market recovery period			5 years	5 years
		Estimated market rate	1.9%	-	2.3%	1.9%
Private equity investments	Market comparable companies	EBITDA multiple	4.0	-	6.0	5.3
Mortgage loan commitments	Discounted cash flow	Probability of funding	58.7%	-	99.8%	84.1%
		Embedded servicing value	.6%	-	1.0%	0.9%

* Unobservable inputs were weighted by the relative fair value of the instruments.

Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]

For assets measured at fair value on a nonrecurring basis during the first nine months of 2020 and 2019, and still held as of September 30, 2020 and 2019, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at September 30, 2020 and 2019.


			Fair Value Measurements Using
(In thousands)	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Gains (Losses) Recognized During the Nine Months Ended September 30
September 30, 2020
Collateral dependent impaired loans	$	11,772	$	—	$	—	$	11,772	$	(3,214)

Mortgage servicing rights	5,731		—		—		5,731		(1,823)



September 30, 2019
Collateral dependent impaired loans	$	171	$	—	$	—	$	171	$	(139)

Mortgage servicing rights	7,235		—		—		7,235		(404)

Long-lived assets	820		—		—		820		(318)

Information about Level Three Fair Value Measurements - Nonrecurring Basis

The Company's significant Level 3 measurements that are measured on a nonrecurring basis pertain to the Company's mortgage servicing rights retained on certain fixed rate personal real estate loan originations. Mortgage servicing rights are included in other assets on the consolidated balance sheet, and information about these inputs is presented in the table below.


Quantitative Information about Level 3 Fair Value Measurements										Weighted
	Valuation Technique	Unobservable Input	Range							Average*
Mortgage servicing rights	Discounted cash flow	Discount rate	9.16		%	-	9.30		%	9.28		%
		Prepayment speeds (CPR)*	13.22		%	-	14.80		%	14.58		%
		Loan servicing costs - annually per loan
		Performing loans	$	71		-	$	72		$	72
		Delinquent loans	$	200		-	$	750
		Loans in foreclosure	$	1,000

*Ranges and weighted averages based on interest rate tranches.

Fair Value Of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Of Financial Instruments [Abstract]

Fair value of financial instruments [Table Text Block]


	Carrying Amount		Estimated Fair Value at September 30, 2020
(In thousands)			Level 1		Level 2		Level 3		Total
Financial Assets
Loans:
Business	$	6,683,413	$	—	$	—	$	6,623,709	$	6,623,709
Real estate - construction and land	1,009,729		—		—		978,403		978,403
Real estate - business	2,993,192		—		—		2,986,961		2,986,961
Real estate - personal	2,753,867		—		—		2,766,421		2,766,421
Consumer	2,006,360		—		—		1,990,589		1,990,589
Revolving home equity	324,203		—		—		320,264		320,264
Consumer credit card	647,893		—		—		576,898		576,898
Overdrafts	2,270		—		—		2,227		2,227
Total loans	16,420,927		—		—		16,245,472		16,245,472
Loans held for sale	39,483		—		39,483		—		39,483




Investment securities	11,691,601		837,861		10,721,942		131,798		11,691,601
Federal funds sold	2,275		2,275		—		—		2,275
Securities purchased under agreements to resell	850,000		—		—		903,772		903,772
Interest earning deposits with banks	1,171,697		1,171,697		—		—		1,171,697
Cash and due from banks	357,616		357,616		—		—		357,616
Derivative instruments	147,850		—		144,273		3,577		147,850
Assets held in trust for deferred compensation plan	17,294		17,294		—		—		17,294
Total	$	30,698,743	$	2,386,743	$	10,905,698	$	17,284,619	$	30,577,060
Financial Liabilities
Non-interest bearing deposits	$	10,727,827	$	10,727,827	$	—	$	—	$	10,727,827
Savings, interest checking and money market deposits	12,983,505		12,983,505		—		—		12,983,505
Certificates of deposit	1,990,447		—		—		2,002,118		2,002,118
Federal funds purchased	6,770		6,770		—		—		6,770
Securities sold under agreements to repurchase	1,646,294		—		—		1,646,338		1,646,338

Derivative instruments	20,370		—		19,185		1,185		20,370
Liabilities held in trust for deferred compensation plan	17,294		17,294		—		—		17,294
Total	$	27,392,507	$	23,735,396	$	19,185	$	3,649,641	$	27,404,222


	Carrying Amount		Estimated Fair Value at December 31, 2019
(In thousands)			Level 1		Level 2		Level 3		Total
Financial Assets
Loans:
Business	$	5,565,449	$	—	$	—	$	5,526,303	$	5,526,303
Real estate - construction and land	899,377		—		—		898,152		898,152
Real estate - business	2,833,554		—		—		2,849,213		2,849,213
Real estate - personal	2,354,760		—		—		2,333,002		2,333,002
Consumer	1,964,145		—		—		1,938,505		1,938,505
Revolving home equity	349,251		—		—		344,424		344,424
Consumer credit card	764,977		—		—		708,209		708,209
Overdrafts	6,304		—		—		4,478		4,478
Total loans	14,737,817		—		—		14,602,286		14,602,286
Loans held for sale	13,809		—		13,809		—		13,809




Investment securities	8,741,888		854,705		7,738,158		149,025		8,741,888

Securities purchased under agreements to resell	850,000		—		—		869,592		869,592
Interest earning deposits with banks	395,850		395,850		—		—		395,850
Cash and due from banks	491,615		491,615		—		—		491,615
Derivative instruments	105,674		—		105,075		599		105,674
Assets held in trust for deferred compensation plan	16,518		16,518		—		—		16,518
Total	$	25,353,171	$	1,758,688	$	7,857,042	$	15,621,502	$	25,237,232
Financial Liabilities
Non-interest bearing deposits	$	6,890,687	$	6,890,687	$	—	$	—	$	6,890,687
Savings, interest checking and money market deposits	11,621,716		11,621,716		—		—		11,621,716
Certificates of deposit	2,008,012		—		—		2,022,629		2,022,629
Federal funds purchased	20,035		20,035		—		—		20,035
Securities sold under agreements to repurchase	1,830,737		—		—		1,831,518		1,831,518
Other borrowings	988		—		988		—		988
Derivative instruments	10,219		—		9,989		230		10,219
Liabilities held in trust for deferred compensation plan	16,518		16,518		—		—		16,518
Total	$	22,398,912	$	18,548,956	$	10,977	$	3,854,377	$	22,414,310

Principles Of Consolidation And Presentation (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 3,306,264	$ 3,358,169		$ 3,138,472	$ 3,106,014	$ 3,171,363	$ 2,937,149
Financing Receivable, Allowance for Credit Loss	236,360	240,744	$ 139,643
Off-Balance Sheet, Credit Loss, Liability	35,200	35,299	17,165	1,075
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	128,424	130,553	62,049
Off-Balance Sheet, Credit Loss, Liability	33,992	34,052	16,456
Personal Banking Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	107,936	110,191	77,594
Off-Balance Sheet, Credit Loss, Liability	1,208	1,247	709
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 326,890	$ 232,082		$ 201,562	$ 463,231	$ 384,232	$ 241,163
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(21,039)
Off-Balance Sheet, Credit Loss, Liability			16,090
Deferred Income Tax Assets, Net			(1,200)
Accounting Standards Update 2016-13 \| Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(29,711)
Accounting Standards Update 2016-13 \| Personal Banking Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			8,672
Accounting Standards Update 2016-13 \| Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 3,800

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 45
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Debt Securities, Available-for-sale [Line Items]

Principles Of Consolidation And Presentation (Adoption Impact of ASU 2016-13) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance	$ 236,360			$ 160,682	$ 160,682	$ 161,182	$ 159,932
Financing Receivable, Allowance for Credit Loss	236,360	$ 240,744	$ 139,643
Off-Balance Sheet, Credit Loss, Liability	35,200	35,299	17,165	1,075
Loans and Leases Receivable and Liability for Unfunded Lending Commitments, Allowance				161,757
Allowance for Credit Losses on Loans and Liability for Unfunded Lending Commitments, Total			156,808
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(21,039)
Off-Balance Sheet, Credit Loss, Liability			16,090
Allowance for Credit Losses on Loans and Liability for Unfunded Lending Commitments, Total			(4,949)
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				91,760	92,070	91,808	92,869
Financing Receivable, Allowance for Credit Loss	128,424	130,553	62,049
Off-Balance Sheet, Credit Loss, Liability	33,992	34,052	16,456
Commercial Portfolio Segment [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(29,711)
Commercial Portfolio Segment [Member] \| Business [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				44,268
Financing Receivable, Allowance for Credit Loss			37,940
Commercial Portfolio Segment [Member] \| Business [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(6,328)
Commercial Portfolio Segment [Member] \| Real Estate - Construction And Land [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				21,589
Financing Receivable, Allowance for Credit Loss			9,204
Commercial Portfolio Segment [Member] \| Real Estate - Construction And Land [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(12,385)
Commercial Portfolio Segment [Member] \| Real Estate - Business [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				25,903
Financing Receivable, Allowance for Credit Loss			14,905
Commercial Portfolio Segment [Member] \| Real Estate - Business [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(10,998)
Personal Banking Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				68,922	$ 68,612	$ 69,374	$ 67,063
Financing Receivable, Allowance for Credit Loss	107,936	110,191	77,594
Off-Balance Sheet, Credit Loss, Liability	$ 1,208	$ 1,247	709
Personal Banking Portfolio Segment [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			8,672
Personal Banking Portfolio Segment [Member] \| Real Estate - Personal [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				3,125
Financing Receivable, Allowance for Credit Loss			4,855
Personal Banking Portfolio Segment [Member] \| Real Estate - Personal [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			1,730
Personal Banking Portfolio Segment [Member] \| Consumer [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				15,932
Financing Receivable, Allowance for Credit Loss			14,518
Personal Banking Portfolio Segment [Member] \| Consumer [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(1,414)
Personal Banking Portfolio Segment [Member] \| Revolving Home Equity [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				638
Financing Receivable, Allowance for Credit Loss			1,624
Personal Banking Portfolio Segment [Member] \| Revolving Home Equity [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			986
Personal Banking Portfolio Segment [Member] \| Consumer Credit Card [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				47,997
Financing Receivable, Allowance for Credit Loss			56,495
Personal Banking Portfolio Segment [Member] \| Consumer Credit Card [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			8,498
Personal Banking Portfolio Segment [Member] \| Overdrafts [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans and Leases Receivable, Allowance				$ 1,230
Financing Receivable, Allowance for Credit Loss			102
Personal Banking Portfolio Segment [Member] \| Overdrafts [Member] \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			$ (1,128)

Loans And Allowance For Credit Losses (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	$ 4,100,000,000
Loans Pledged to the Federal Reserve Bank as collateral for discount window borrowings	$ 1,500,000,000
Period after which loans are deemed in default (in days)	90 days
Effect on Interest Income Resulting From Modification to Credit Card Loans	$ (1,100,000)
Commitments to lend additional funds to customers with restructured loans	13,100,000
Mortgages Held-for-sale, Fair Value Disclosure	35,076,000	$ 9,181,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	33,300,000
Student Loans Held for Sale, Lower of Cost or Fair Value	4,400,000
HFS Loans on non accrual status	0
HFS loans past due and still accruing	0
Foreclosed real estate	57,000	365,000
Personal property acquired in repossession	1,300,000	$ 5,500,000
Business [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Nonaccrual, No Allowance	$ 20,600,000

Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	$ 16,420,927	$ 16,420,927	$ 14,737,817
Interest Receivable	41,300	41,300
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Accrued Interest Receivable on Held for Investment Loans, Write Off	89	258
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Accrued Interest Receivable on Held for Investment Loans, Write Off	1,700	4,400
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	6,683,413	6,683,413	5,565,449
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	1,009,729	1,009,729	899,377
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	2,993,192	2,993,192	2,833,554
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	2,753,867	2,753,867	2,354,760
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	2,006,360	2,006,360	1,964,145
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	324,203	324,203	349,251
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	647,893	647,893	764,977
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross	$ 2,270	$ 2,270	$ 6,304

Loans And Allowance For Credit Losses (Summary of Activity in the Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 236,360	$ 236,360	$ 240,744	$ 139,643
Financing Receivable, Credit Loss, Expense (Reversal)	3,200	123,559
Financing Receivable, Allowance for Credit Loss, Writeoff	10,649	36,286
Financing Receivable, Allowance for Credit Loss, Recovery	3,065	9,444
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	7,584	26,842
Off-Balance Sheet, Credit Loss, Liability	35,200	35,200	35,299	17,165	$ 1,075
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(99)	18,035
Financing Receivable, Allowance for Credit Loss and Unfunded Lending Commitments, Total	271,560	271,560
Previously Reported [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			240,744		160,682
Off-Balance Sheet, Credit Loss, Liability			35,299		1,075
Revision of Prior Period, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			0	(21,039)
Off-Balance Sheet, Credit Loss, Liability			0	16,090
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	128,424	128,424	130,553	62,049
Financing Receivable, Credit Loss, Expense (Reversal)	(1,935)	69,418
Financing Receivable, Allowance for Credit Loss, Writeoff	357	4,159
Financing Receivable, Allowance for Credit Loss, Recovery	163	1,116
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	194	3,043
Off-Balance Sheet, Credit Loss, Liability	33,992	33,992	34,052	16,456
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(60)	17,536
Financing Receivable, Allowance for Credit Loss and Unfunded Lending Commitments, Total	162,416	162,416
Commercial Portfolio Segment [Member] \| Previously Reported [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			130,553		91,760
Off-Balance Sheet, Credit Loss, Liability			34,052		399
Commercial Portfolio Segment [Member] \| Revision of Prior Period, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			0	(29,711)
Off-Balance Sheet, Credit Loss, Liability			0	16,057
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	107,936	107,936	110,191	77,594
Financing Receivable, Credit Loss, Expense (Reversal)	5,135	54,141
Financing Receivable, Allowance for Credit Loss, Writeoff	10,292	32,127
Financing Receivable, Allowance for Credit Loss, Recovery	2,902	8,328
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	7,390	23,799
Off-Balance Sheet, Credit Loss, Liability	1,208	1,208	1,247	709
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(39)	499
Financing Receivable, Allowance for Credit Loss and Unfunded Lending Commitments, Total	$ 109,144	$ 109,144
Personal Banking Portfolio Segment [Member] \| Previously Reported [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			110,191		68,922
Off-Balance Sheet, Credit Loss, Liability			1,247		$ 676
Personal Banking Portfolio Segment [Member] \| Revision of Prior Period, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			0	8,672
Off-Balance Sheet, Credit Loss, Liability			$ 0	$ 33

Loans And Allowance For Credit Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at start of period	$ 161,182	$ 159,932
Provision	10,963	35,232
Loans charged off	14,480	43,669
Less recoveries on loans	3,017	9,187
Allowance for Loan and Lease Losses Write-offs, Net, Total	11,463	34,482
Balance at end of period	160,682	160,682
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at start of period	91,808	92,869
Provision	553	55
Loans charged off	490	1,436
Less recoveries on loans	199	582
Allowance for Loan and Lease Losses Write-offs, Net, Total	291	854
Balance at end of period	92,070	92,070
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at start of period	69,374	67,063
Provision	10,410	35,177
Loans charged off	13,990	42,233
Less recoveries on loans	2,818	8,605
Allowance for Loan and Lease Losses Write-offs, Net, Total	11,172	33,628
Balance at end of period	$ 68,612	$ 68,612

Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	$ 16,296,692	$ 14,627,638
30 - 89 Days Past Due	69,529	80,100
90 Days Past Due and Still Accruing	14,436	19,859
Non-accrual loans	40,270	10,220
Total	16,420,927	14,737,817
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,683,413	5,565,449
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,009,729	899,377
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,993,192	2,833,554
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,753,867	2,354,760
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,006,360	1,964,145
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	324,203	349,251
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	647,893	764,977
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,270	6,304
Commercial Portfolio Segment [Member] \| Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	6,636,383	5,545,104
30 - 89 Days Past Due	7,106	12,064
90 Days Past Due and Still Accruing	2,629	792
Non-accrual loans	37,295	7,489
Commercial Portfolio Segment [Member] \| Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	991,404	882,826
30 - 89 Days Past Due	18,320	13,046
90 Days Past Due and Still Accruing	4	3,503
Non-accrual loans	1	2
Commercial Portfolio Segment [Member] \| Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,987,992	2,830,494
30 - 89 Days Past Due	4,137	2,030
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	1,063	1,030
Personal Banking Portfolio Segment [Member] \| Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,743,260	2,345,243
30 - 89 Days Past Due	6,029	6,129
90 Days Past Due and Still Accruing	2,667	1,689
Non-accrual loans	1,911	1,699
Personal Banking Portfolio Segment [Member] \| Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	1,983,820	1,928,082
30 - 89 Days Past Due	20,329	34,053
90 Days Past Due and Still Accruing	2,211	2,010
Non-accrual loans	0	0
Personal Banking Portfolio Segment [Member] \| Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	322,572	347,258
30 - 89 Days Past Due	1,237	1,743
90 Days Past Due and Still Accruing	394	250
Non-accrual loans	0	0
Personal Banking Portfolio Segment [Member] \| Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	629,181	742,659
30 - 89 Days Past Due	12,181	10,703
90 Days Past Due and Still Accruing	6,531	11,615
Non-accrual loans	0	0
Personal Banking Portfolio Segment [Member] \| Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,080	5,972
30 - 89 Days Past Due	190	332
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	$ 0	$ 0

Loans And Allowance For Credit Losses (Credit Quality Indicators Commercial Loan Portfolio) (Details) - Commercial Portfolio Segment [Member] $ in Thousands	Sep. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 3,664,618
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,192,679
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,124,621
Financing Receivable, Originated Three Years before Latest Fiscal Year	785,315
Financing Receivable, Originated Four Years before Latest Fiscal Year	588,914
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	601,503
Financing Receivable, Revolving	1,728,684
Financing Receivable, before Allowance for Credit Loss, Total	10,686,334
Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,460,120
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,152,417
Financing Receivable, Originated Two Years before Latest Fiscal Year	540,702
Financing Receivable, Originated Three Years before Latest Fiscal Year	360,401
Financing Receivable, Originated Four Years before Latest Fiscal Year	196,498
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	327,248
Financing Receivable, Revolving	1,646,027
Financing Receivable, before Allowance for Credit Loss, Total	6,683,413
Real Estate - Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	408,820
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	323,632
Financing Receivable, Originated Two Years before Latest Fiscal Year	142,306
Financing Receivable, Originated Three Years before Latest Fiscal Year	76,764
Financing Receivable, Originated Four Years before Latest Fiscal Year	24,660
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	682
Financing Receivable, Revolving	32,865
Financing Receivable, before Allowance for Credit Loss, Total	1,009,729
Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	795,678
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	716,630
Financing Receivable, Originated Two Years before Latest Fiscal Year	441,613
Financing Receivable, Originated Three Years before Latest Fiscal Year	348,150
Financing Receivable, Originated Four Years before Latest Fiscal Year	367,756
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	273,573
Financing Receivable, Revolving	49,792
Financing Receivable, before Allowance for Credit Loss, Total	2,993,192
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,514,978
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,119,417
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,034,786
Financing Receivable, Originated Three Years before Latest Fiscal Year	689,299
Financing Receivable, Originated Four Years before Latest Fiscal Year	541,265
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	547,026
Financing Receivable, Revolving	1,614,600
Financing Receivable, before Allowance for Credit Loss, Total	10,061,371
Pass [Member] \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,394,434
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,097,498
Financing Receivable, Originated Two Years before Latest Fiscal Year	518,966
Financing Receivable, Originated Three Years before Latest Fiscal Year	356,416
Financing Receivable, Originated Four Years before Latest Fiscal Year	186,992
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	307,681
Financing Receivable, Revolving	1,535,511
Financing Receivable, before Allowance for Credit Loss, Total	6,397,498
Pass [Member] \| Real Estate - Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	407,465
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	323,632
Financing Receivable, Originated Two Years before Latest Fiscal Year	131,606
Financing Receivable, Originated Three Years before Latest Fiscal Year	49,040
Financing Receivable, Originated Four Years before Latest Fiscal Year	24,660
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	682
Financing Receivable, Revolving	32,865
Financing Receivable, before Allowance for Credit Loss, Total	969,950
Pass [Member] \| Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	713,079
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	698,287
Financing Receivable, Originated Two Years before Latest Fiscal Year	384,214
Financing Receivable, Originated Three Years before Latest Fiscal Year	283,843
Financing Receivable, Originated Four Years before Latest Fiscal Year	329,613
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	238,663
Financing Receivable, Revolving	46,224
Financing Receivable, before Allowance for Credit Loss, Total	2,693,923
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	54,280
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	40,477
Financing Receivable, Originated Two Years before Latest Fiscal Year	73,186
Financing Receivable, Originated Three Years before Latest Fiscal Year	22,618
Financing Receivable, Originated Four Years before Latest Fiscal Year	26,610
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,128
Financing Receivable, Revolving	63,975
Financing Receivable, before Allowance for Credit Loss, Total	284,274
Special Mention [Member] \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	29,620
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	28,518
Financing Receivable, Originated Two Years before Latest Fiscal Year	17,532
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,120
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,773
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,843
Financing Receivable, Revolving	63,973
Financing Receivable, before Allowance for Credit Loss, Total	148,379
Special Mention [Member] \| Real Estate - Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	10,107
Financing Receivable, Originated Three Years before Latest Fiscal Year	14,555
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	24,662
Special Mention [Member] \| Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	24,660
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,959
Financing Receivable, Originated Two Years before Latest Fiscal Year	45,547
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,943
Financing Receivable, Originated Four Years before Latest Fiscal Year	20,837
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,285
Financing Receivable, Revolving	2
Financing Receivable, before Allowance for Credit Loss, Total	111,233
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	75,410
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32,500
Financing Receivable, Originated Two Years before Latest Fiscal Year	13,960
Financing Receivable, Originated Three Years before Latest Fiscal Year	73,382
Financing Receivable, Originated Four Years before Latest Fiscal Year	20,914
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47,351
Financing Receivable, Revolving	38,813
Financing Receivable, before Allowance for Credit Loss, Total	302,330
Substandard [Member] \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	16,118
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	26,401
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,139
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,849
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,608
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13,879
Financing Receivable, Revolving	35,247
Financing Receivable, before Allowance for Credit Loss, Total	100,241
Substandard [Member] \| Real Estate - Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,354
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	593
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,169
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	15,116
Substandard [Member] \| Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	57,938
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,099
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,228
Financing Receivable, Originated Three Years before Latest Fiscal Year	57,364
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,306
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	33,472
Financing Receivable, Revolving	3,566
Financing Receivable, before Allowance for Credit Loss, Total	186,973
Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	19,950
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	285
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,689
Financing Receivable, Originated Three Years before Latest Fiscal Year	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	125
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,998
Financing Receivable, Revolving	11,296
Financing Receivable, before Allowance for Credit Loss, Total	38,359
Non-Accrual [Member] \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	19,948
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,065
Financing Receivable, Originated Three Years before Latest Fiscal Year	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	125
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,845
Financing Receivable, Revolving	11,296
Financing Receivable, before Allowance for Credit Loss, Total	37,295
Non-Accrual [Member] \| Real Estate - Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	1
Non-Accrual [Member] \| Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	285
Financing Receivable, Originated Two Years before Latest Fiscal Year	624
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	153
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	$ 1,063

Loans And Allowance For Credit Losses (Credit Quality Commercial Loan Portfolio Non-Vintage) (Details) - Commercial Portfolio Segment [Member] $ in Thousands	Dec. 31, 2019 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 9,298,380
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,910,119
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	215,256
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	164,484
Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,521
Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,565,449
Business [Member] \| Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,393,928
Business [Member] \| Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	80,089
Business [Member] \| Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	83,943
Business [Member] \| Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	7,489
Real Estate - Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	899,377
Real Estate - Construction And Land [Member] \| Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	856,364
Real Estate - Construction And Land [Member] \| Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	42,541
Real Estate - Construction And Land [Member] \| Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	470
Real Estate - Construction And Land [Member] \| Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2
Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,833,554
Real Estate - Business [Member] \| Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,659,827
Real Estate - Business [Member] \| Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	92,626
Real Estate - Business [Member] \| Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	80,071
Real Estate - Business [Member] \| Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 1,030

Loans And Allowance for Credit Losses (Credit Quality Indicators Personal Banking Loan Portfolio) (Details) - Personal Banking Portfolio Segment [Member] $ in Thousands	Sep. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 1,346,535
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	913,328
Financing Receivable, Originated Two Years before Latest Fiscal Year	426,987
Financing Receivable, Originated Three Years before Latest Fiscal Year	365,334
Financing Receivable, Originated Four Years before Latest Fiscal Year	338,630
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	702,738
Financing Receivable, Revolving	1,641,041
Financing Receivable, before Allowance for Credit Loss, Total	5,734,593
Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	897,280
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	532,592
Financing Receivable, Originated Two Years before Latest Fiscal Year	238,643
Financing Receivable, Originated Three Years before Latest Fiscal Year	227,905
Financing Receivable, Originated Four Years before Latest Fiscal Year	248,232
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	597,994
Financing Receivable, Revolving	11,221
Financing Receivable, before Allowance for Credit Loss, Total	2,753,867
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	446,985
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	380,736
Financing Receivable, Originated Two Years before Latest Fiscal Year	188,344
Financing Receivable, Originated Three Years before Latest Fiscal Year	137,429
Financing Receivable, Originated Four Years before Latest Fiscal Year	90,398
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	104,744
Financing Receivable, Revolving	657,724
Financing Receivable, before Allowance for Credit Loss, Total	2,006,360
Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	324,203
Financing Receivable, before Allowance for Credit Loss, Total	324,203
Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	647,893
Financing Receivable, before Allowance for Credit Loss, Total	647,893
Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,270
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	2,270
Current to 90 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,346,186
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	912,402
Financing Receivable, Originated Two Years before Latest Fiscal Year	426,278
Financing Receivable, Originated Three Years before Latest Fiscal Year	364,752
Financing Receivable, Originated Four Years before Latest Fiscal Year	337,990
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	700,179
Financing Receivable, Revolving	1,633,092
Financing Receivable, before Allowance for Credit Loss, Total	5,720,879
Current to 90 Days Past Due \| Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	897,007
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	532,003
Financing Receivable, Originated Two Years before Latest Fiscal Year	238,092
Financing Receivable, Originated Three Years before Latest Fiscal Year	227,499
Financing Receivable, Originated Four Years before Latest Fiscal Year	247,754
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	595,713
Financing Receivable, Revolving	11,221
Financing Receivable, before Allowance for Credit Loss, Total	2,749,289
Current to 90 Days Past Due \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	446,909
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	380,399
Financing Receivable, Originated Two Years before Latest Fiscal Year	188,186
Financing Receivable, Originated Three Years before Latest Fiscal Year	137,253
Financing Receivable, Originated Four Years before Latest Fiscal Year	90,236
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	104,466
Financing Receivable, Revolving	656,700
Financing Receivable, before Allowance for Credit Loss, Total	2,004,149
Current to 90 Days Past Due \| Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	323,809
Financing Receivable, before Allowance for Credit Loss, Total	323,809
Current to 90 Days Past Due \| Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	641,362
Financing Receivable, before Allowance for Credit Loss, Total	641,362
Current to 90 Days Past Due \| Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,270
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	2,270
Over 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	349
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	731
Financing Receivable, Originated Two Years before Latest Fiscal Year	580
Financing Receivable, Originated Three Years before Latest Fiscal Year	537
Financing Receivable, Originated Four Years before Latest Fiscal Year	519
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,138
Financing Receivable, Revolving	7,949
Financing Receivable, before Allowance for Credit Loss, Total	11,803
Over 90 days past due \| Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	273
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	394
Financing Receivable, Originated Two Years before Latest Fiscal Year	422
Financing Receivable, Originated Three Years before Latest Fiscal Year	361
Financing Receivable, Originated Four Years before Latest Fiscal Year	357
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	860
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	2,667
Over 90 days past due \| Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	76
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	337
Financing Receivable, Originated Two Years before Latest Fiscal Year	158
Financing Receivable, Originated Three Years before Latest Fiscal Year	176
Financing Receivable, Originated Four Years before Latest Fiscal Year	162
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	278
Financing Receivable, Revolving	1,024
Financing Receivable, before Allowance for Credit Loss, Total	2,211
Over 90 days past due \| Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	394
Financing Receivable, before Allowance for Credit Loss, Total	394
Over 90 days past due \| Consumer Credit Card [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	6,531
Financing Receivable, before Allowance for Credit Loss, Total	6,531
Over 90 days past due \| Overdrafts [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	0
Non-Accrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	195
Financing Receivable, Originated Two Years before Latest Fiscal Year	129
Financing Receivable, Originated Three Years before Latest Fiscal Year	45
Financing Receivable, Originated Four Years before Latest Fiscal Year	121
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,421
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	1,911
Non-Accrual [Member] \| Real Estate - Personal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	195
Financing Receivable, Originated Two Years before Latest Fiscal Year	129
Financing Receivable, Originated Three Years before Latest Fiscal Year	45
Financing Receivable, Originated Four Years before Latest Fiscal Year	121
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,421
Financing Receivable, Revolving	0
Financing Receivable, before Allowance for Credit Loss, Total	$ 1,911

Loans And Allowance for Credit Losses (Collateral-Dependent Loans) (Details) - Commercial Portfolio Segment [Member] $ in Thousands	Sep. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	$ 36,734
Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	36,734
Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	18,843
Business Assets \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	18,843
Future Revenue Streams
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	3,616
Future Revenue Streams \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	3,616
Energy Service
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	14,276
Energy Service \| Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	$ 14,276

Loans And Allowance For Credit Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 183.3	$ 198.2
Consumer Healthcare Loans Excluded	$ 193.2	$ 199.2
Credit quality personal banking loan table percentage loans excluded	7.00%
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real Estate - Personal [Member] \| Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.00%	1.00%
Real Estate - Personal [Member] \| Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.10%	1.90%
Real Estate - Personal [Member] \| Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	8.50%	9.20%
Real Estate - Personal [Member] \| Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.70%	25.70%
Real Estate - Personal [Member] \| Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	62.70%	62.20%
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer [Member] \| Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.40%	3.00%
Consumer [Member] \| Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.90%	5.20%
Consumer [Member] \| Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	14.50%	15.40%
Consumer [Member] \| Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.60%	27.00%
Consumer [Member] \| Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	53.60%	49.40%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] \| Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.40%	1.70%
Revolving Home Equity [Member] \| Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.50%	1.90%
Revolving Home Equity [Member] \| Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	7.30%	9.00%
Revolving Home Equity [Member] \| Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.60%	21.50%
Revolving Home Equity [Member] \| Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	66.20%	65.90%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] \| Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.20%	5.60%
Consumer Credit Card [Member] \| Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.90%	14.30%
Consumer Credit Card [Member] \| Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.20%	32.20%
Consumer Credit Card [Member] \| Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.50%	26.60%
Consumer Credit Card [Member] \| Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.20%	21.30%

Loans And Allowance For Credit Losses (Troubled Debt Restructurings by Type of Modification) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 73,161	$ 79,450
Performing/Accruing TDR - Commercial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	50,921	55,934
Performing/Accruing TDR - Assistance programs [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	8,208	8,365
Performing/Accruing TDR - Consumer Bankruptcy [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,101	3,592
Performing/Accruing TDR - Other Consumer [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	2,418	3,621
TDR Non-accrual loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 8,513	$ 7,938

Loans And Allowance For Credit Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 73,161	$ 79,450
Balance 90 days past due at any time during previous 12 months	1,286
Commercial Portfolio Segment [Member] \| Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	17,696
Balance 90 days past due at any time during previous 12 months	674
Commercial Portfolio Segment [Member] \| Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	41
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] \| Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	40,596
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] \| Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,278
Balance 90 days past due at any time during previous 12 months	252
Personal Banking Portfolio Segment [Member] \| Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,530
Balance 90 days past due at any time during previous 12 months	103
Personal Banking Portfolio Segment [Member] \| Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	56
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] \| Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	7,964
Balance 90 days past due at any time during previous 12 months	$ 257

Loans And Allowance For Credit Losses (Total Impaired Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Non-accrual loans	$ 40,270	$ 10,220
Accruing Restructured Loans		71,512
Impaired Financing Receivable, Recorded Investment, Total		$ 81,732

Loans And Allowance For Credit Losses (Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Related Allowance	$ 2,746
Impaired Financing Receivable, Recorded Investment	81,732
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	157,936
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	14,656,085
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Related Allowance	1,629
Impaired Financing Receivable, Recorded Investment	64,500
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	90,131
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	9,233,880
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Related Allowance	1,117
Impaired Financing Receivable, Recorded Investment	17,232
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	67,805
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	$ 5,422,205

Loans And Allowance For Credit Losses (Additional Information About Impaired Loans Held) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 81,732
Impaired Financing Receivable, Unpaid Principal Balance	90,390
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,054
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,738
Impaired Financing Receivable, with No Related Allowance, Allowance	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	74,678
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	76,652
Impaired Financing Receivable, Related Allowance	2,746
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,054
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,738
Impaired Financing Receivable, with No Related Allowance, Allowance	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	30,437
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	30,487
Impaired Financing Receivable, Related Allowance	837
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	46
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	51
Impaired Financing Receivable, Related Allowance	1
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	26,963
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	27,643
Impaired Financing Receivable, Related Allowance	791
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,729
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,968
Impaired Financing Receivable, Related Allowance	258
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,421
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,421
Impaired Financing Receivable, Related Allowance	35
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	35
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	35
Impaired Financing Receivable, Related Allowance	1
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,047
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,047
Impaired Financing Receivable, Related Allowance	$ 823

Loans And Allowance For Credit Losses (Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 11,558	$ 11,955
Restructured loans (accruing)	69,161	63,853
Average Impaired Loans, Total	80,719	75,808
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	9,655	9,881
Restructured loans (accruing)	53,517	48,248
Average Impaired Loans, Total	63,172	58,129
Personal Banking Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	1,903	2,074
Restructured loans (accruing)	15,644	15,605
Average Impaired Loans, Total	$ 17,547	$ 17,679

Loans And Allowance For Credit Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 875	$ 2,618
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	222	665
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	1	2
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	363	1,088
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	31	92
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	76	227
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	1	2
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 181	$ 542

Investment Securities (Narrative) (Details) $ in Thousands	9 Months Ended
Investment Securities (Narrative) (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on impairment watch list	$ 53,300		$ 51,600
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	843,000		$ 1,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	14,600
AFS securities in loss position at period-end, change in unrealized loss	1,700
Securities pledged as collateral	4,500,000
Securities pledged as collateral and may be sold or re-pledged	$ 218,000
Number of investments in a single issuer that exceed 10% of stockholder's equity	0
No investment in a single issuer exceeds this percentage of stockholder's equity	10.00%
U.S. Government and Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
U.S. Treasury inflation-protected securities held, at fair value	$ 429,800
Private Equity Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value adjustments, net	(18,100)
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	(126)	$ 318
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Gains realized on sales	$ 16,965	$ 2,287

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investment Securities [Abstract]
Debt Securities, Available-for-sale	$ 11,539,061	$ 8,571,626
Trading securities	25,805	28,161
Equity securities with a readily determinable fair value	2,803	2,929
Equtiy Securities without Readily Determinable Fair Values	1,400	1,280
Federal Reserve Bank Stock	34,070	33,770
Federal Home Loan Bank Stock	10,000	10,000
Private equity investments	78,462	94,122
Total investment securities	11,691,601	$ 8,741,888
Interest Receivable, Current	$ 39,700

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 11,182,348,000	$ 8,435,531,000
Debt Securities, Available-for-sale, Fair Value	11,539,061,000	8,571,626,000
U.S. Government and Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	773,568,000	827,861,000
Debt Securities, Available-for-sale, Fair Value	835,058,000	851,776,000
U.S. Government and Federal Agency Obligations [Member] \| Available For Sale Securities Maturity Within1 Year [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	59,367,000
Debt Securities, Available-for-sale, Fair Value	59,706,000
U.S. Government and Federal Agency Obligations [Member] \| Available For Sale Securities Maturity After1 But Within5 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	489,042,000
Debt Securities, Available-for-sale, Fair Value	521,797,000
U.S. Government and Federal Agency Obligations [Member] \| Available For Sale Securities Maturity After5 But Within10 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	225,159,000
Debt Securities, Available-for-sale, Fair Value	253,555,000
Government-Sponsored Enterprise Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	91,003,000	138,734,000
Debt Securities, Available-for-sale, Fair Value	95,301,000	139,277,000
Government-Sponsored Enterprise Obligations [Member] \| Available For Sale Securities Maturity Within1 Year [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	55,185,000
Debt Securities, Available-for-sale, Fair Value	54,770,000
Government-Sponsored Enterprise Obligations [Member] \| Available For Sale Maturity After10 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	35,818,000
Debt Securities, Available-for-sale, Fair Value	40,531,000
State and Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,895,269,000	1,225,532,000
Debt Securities, Available-for-sale, Fair Value	1,969,144,000	1,267,927,000
State and Municipal Obligations [Member] \| Available For Sale Securities Maturity Within1 Year [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	68,787,000
Debt Securities, Available-for-sale, Fair Value	69,179,000
State and Municipal Obligations [Member] \| Available For Sale Securities Maturity After1 But Within5 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	764,831,000
Debt Securities, Available-for-sale, Fair Value	803,168,000
State and Municipal Obligations [Member] \| Available For Sale Securities Maturity After5 But Within10 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	597,276,000
Debt Securities, Available-for-sale, Fair Value	624,525,000
State and Municipal Obligations [Member] \| Available For Sale Maturity After10 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	464,375,000
Debt Securities, Available-for-sale, Fair Value	472,272,000
Agency Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,919,500,000	3,893,247,000
Debt Securities, Available-for-sale, Fair Value	6,081,802,000	3,937,964,000
Non-Agency Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	324,266,000	796,451,000
Debt Securities, Available-for-sale, Fair Value	332,970,000	809,782,000
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,633,988,000	1,228,151,000
Debt Securities, Available-for-sale, Fair Value	1,658,579,000	1,233,489,000
Total Mortgage And Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,877,754,000	5,917,849,000
Debt Securities, Available-for-sale, Fair Value	8,073,351,000	5,981,235,000
Other Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	544,754,000	325,555,000
Debt Securities, Available-for-sale, Fair Value	566,207,000	$ 331,411,000
Other Debt Securities [Member] \| Available For Sale Securities Maturity Within1 Year [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	23,565,000
Debt Securities, Available-for-sale, Fair Value	23,701,000
Other Debt Securities [Member] \| Available For Sale Securities Maturity After1 But Within5 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	252,180,000
Debt Securities, Available-for-sale, Fair Value	264,096,000
Other Debt Securities [Member] \| Available For Sale Securities Maturity After5 But Within10 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	240,814,000
Debt Securities, Available-for-sale, Fair Value	249,136,000
Other Debt Securities [Member] \| Available For Sale Maturity After10 Years [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	28,195,000
Debt Securities, Available-for-sale, Fair Value	$ 29,274,000

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Sep. 30, 2020
Minimum [Member]
Debt Securities, Available-for-sale [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	13.00%
Credit support	0.00%
Loss severity	7.00%
Maximum [Member]
Debt Securities, Available-for-sale [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	54.00%
Credit support	20.00%
Loss severity	63.00%

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 596,690	$ 1,136,297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8,310	9,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	246,267	517,817
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,241	3,451
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	842,957	1,654,114
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	14,551	12,864
U.S. Government and Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	31,787
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	25,405
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	21
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	0	57,192
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	0	42
Government-Sponsored Enterprise Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	14,489	6,155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	503	187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	14,489	6,155
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	503	187
State and Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	84,876	6,700
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	578	31
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	1,554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	1
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	84,876	8,254
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	578	32
Agency Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	287,620	652,352
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,402	5,306
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	147,653
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	867
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	287,620	800,005
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	5,402	6,173
Non-Agency Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	68,513	102,931
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	234	254
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,069	189,747
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	45	451
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	69,582	292,678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	279	705
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	97,592	330,876
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,100	3,610
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	245,198	152,461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,196	2,108
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	342,790	483,337
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	7,296	5,718
Total Mortgage And Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	453,725	1,086,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,736	9,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	246,267	489,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,241	3,426
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	699,992	1,576,020
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	12,977	12,596
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	43,600	5,496
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	493	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	3
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	43,600	6,493
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 493	$ 7

Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 11,182,348,000	$ 8,435,531,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	371,264,000	148,959,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(14,551,000)	(12,864,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Fair Value	11,539,061,000	8,571,626,000
U.S. Government and Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	773,568,000	827,861,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	61,490,000	23,957,000
Available For Sale Securities, Gross Unrealized Loss at Period End	0	(42,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	835,058,000	851,776,000
Government-Sponsored Enterprise Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	91,003,000	138,734,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	4,801,000	730,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(503,000)	(187,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	95,301,000	139,277,000
State and Municipal Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,895,269,000	1,225,532,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	74,453,000	42,427,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(578,000)	(32,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	1,969,144,000	1,267,927,000
Agency Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,919,500,000	3,893,247,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	167,704,000	50,890,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(5,402,000)	(6,173,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	6,081,802,000	3,937,964,000
Non-Agency Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	324,266,000	796,451,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	8,983,000	14,036,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(279,000)	(705,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	332,970,000	809,782,000
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,633,988,000	1,228,151,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	31,887,000	11,056,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(7,296,000)	(5,718,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	1,658,579,000	1,233,489,000
Total Mortgage And Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,877,754,000	5,917,849,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	208,574,000	75,982,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(12,977,000)	(12,596,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	8,073,351,000	5,981,235,000
Other Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	544,754,000	325,555,000
Available For Sale Securities, Gross Unreailzed Gain at Period End	21,946,000	5,863,000
Available For Sale Securities, Gross Unrealized Loss at Period End	(493,000)	(7,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Fair Value	$ 566,207,000	$ 331,411,000

Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Proceeds from Sale of Available-for-sale Securities

$ 574,374

$ 368,939

Proceeds from Sale of Equity Securities

2

3,459

Proceeds From Sale Of Other Securities

0

7,243

Total proceeds

^[1]

574,376

379,641

Available-for-sale Securities [Member]

$ 16,155

$ 4,909

(1,275)

^[1]

3,874

^[1]

Debt Securities, Available-for-sale [Line Items]

Available-for-sale Securities, Gains realized on sales

16,965

2,287

Available-for-sale Securities, Losses realized on sales

0

(1,559)

Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net

0

(133)

Equity Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Gain realized on sales

2

2,865

Equity Securities, FV-NI, Unrealized Gain (Loss)

(126)

318

Other Investments [Member]

Debt Securities, Available-for-sale [Line Items]

Other Securities Gain On Sale

0

1,094

Fair value adjustments, net

$ (18,116)

$ (998)

[1]	Available for sale debt securities, equity securities, and other securities.

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 859	$ 395	$ 1,600	$ 1,100

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 45,253	$ 44,212
Accumulated Amortization	(35,920)	(34,351)
Valuation Allowance	(2,150)	(327)
Net Amount	7,183	9,534
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(29,818)	(29,485)
Valuation Allowance	0	0
Net Amount	1,452	1,785
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,983	12,942
Accumulated Amortization	(6,102)	(4,866)
Valuation Allowance	(2,150)	(327)
Net Amount	$ 5,731	$ 7,749

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 2,143
2021	1,243
2022	1,013
2023	834
2024	$ 689

Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill and Intangible Assets [Roll Forward]
Amortization	$ 859	$ 395	$ 1,600	$ 1,100
Goodwill [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			0
Amortization			0
Impairment reversal			0
Intangible Assets, Net (Including Goodwill)	138,921		138,921		$ 138,921
Core Deposit Premium [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			0
Amortization			(333)
Impairment reversal			0
Intangible Assets, Net (Including Goodwill)	1,452		1,452		1,785
Mortgage Servicing Rights [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			1,041
Amortization			(1,236)
Impairment reversal			(1,823)
Intangible Assets, Net (Including Goodwill)	$ 5,731		$ 5,731		$ 7,749

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 138,921	$ 138,921
Consumer Segment [Member]
Goodwill [Line Items]
Goodwill	70,721	70,721
Commercial Segment [Member]
Goodwill [Line Items]
Goodwill	67,454	67,454
Wealth Segment [Member]
Goodwill [Line Items]
Goodwill	$ 746	$ 746

Guarantees (Details) - USD ($)
$ in Thousands

9 Months Ended

Sep. 30, 2020

Dec. 31, 2019

Notional amount of underlying interest rate swaps associated with risk participation agreements

^[1]

$ 20,370

$ 10,219

3,548,498

$ 4,525,856

Financial Standby Letter Of Credit [Member]

Standby letters of credit, net liability

3,300

Contractual amount of letters of credit, guaranteed maximum potential future payments

318,000

Risk Participation Agreement [Member] | Indirect Guarantee Of Indebtedness [Member]

Notional amount of underlying interest rate swaps associated with risk participation agreements

1,200

$ 272,800

Minimum [Member] | Risk Participation Agreement [Member]

Maximum [Member] | Risk Participation Agreement [Member]

Term, in years

2 years

Sales-type and Direct Financing Leases, Lease Income

Term, in years

11 years

[1]	* The fair value of each class of derivative is shown in Note 11.

Leases (Narrative) (Details)	Sep. 30, 2020
Minimum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term	6 months
Maximum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term	7 years

Leases (Components of Lease Income) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Operating Lease Income [Line Items]

$ 6,437

$ 6,092

$ 19,099

$ 17,988

Operating Lease, Lease Income

^[1]

2,270

1,984

6,491

5,816

Lease Income

8,707

8,076

25,590

23,804

Operating Lease Income from Related Party [Member]

Operating Lease Income [Line Items]

Operating Lease, Lease Income

$ 19

$ 57

$ 56

[1]	(a) Includes rent from Tower Properties Company, a related party, of $19 thousand for the three month periods ended September 30, 2020 and 2019, and $57 thousand and $56 thousand, respectively, for the nine months ended September 30, 2020 and 2019.

Pension Pension (Narrative) (Details)	9 Months Ended
Pension Pension (Narrative) (Details)	Sep. 30, 2020 USD ($)
Pension (Narrative) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References + Details

Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension [Abstract]
Service cost - benefits earned during the period	$ 93	$ 159	$ 295	$ 477
Interest cost on projected benefit obligation	818	1,065	2,463	3,195
Expected Return on Plan Assets	(1,317)	(1,196)	(3,911)	(3,589)
Amortization of Prior Service Cost	(67)	(68)	(203)	(203)
Defined Benefit Plan, Amortization of (Gain) Loss	503	586	1,587	1,757
Net periodic pension cost	$ 30	$ 546	$ 231	$ 1,637

Common Stock (Summary Of Components Used To Calculate Basic And Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 132,448	$ 109,242	$ 224,168	$ 314,351
Less Preferred Stock Dividends	7,466	2,250	11,966	6,750
Net Income (Loss) Available to Common Stockholders	$ 124,982	$ 106,992	$ 212,202	$ 307,601
Basic income per common share	$ 1.12	$ 0.93	$ 1.90	$ 2.65
Diluted income per common share	$ 1.11	$ 0.93	$ 1.89	$ 2.65
Basic Income Per Common Share [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 132,448	$ 109,242	$ 224,168	$ 314,351
Less Preferred Stock Dividends	7,466	2,250	11,966	6,750
Net Income (Loss) Available to Common Stockholders	124,982	106,992	212,202	307,601
Less income allocated to nonvested restricted stockholders	1,173	1,040	1,996	2,996
Net income available to common stockholders	$ 123,809	$ 105,952	$ 210,206	$ 304,605
Weighted average common shares outstanding	110,720	112,982	110,848	114,475
Basic income per common share	$ 1.12	$ 0.93	$ 1.90	$ 2.65
Diluted Income Per Common Share [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Diluted	$ 124,982	$ 106,992	$ 212,202	$ 307,601
Less income allocated to nonvested restricted stockholders	1,170	1,039	1,993	2,991
Net income available to common stockholders	$ 123,812	$ 105,953	$ 210,209	$ 304,610
Weighted average common shares outstanding	110,720	112,982	110,848	114,475
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods	179	267	209	284
Weighted average diluted common shares outstanding	110,899	113,249	111,057	114,759
Diluted income per common share	$ 1.11	$ 0.93	$ 1.89	$ 2.65

Common Stock Common Stock (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common Stock nonprint [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	394	378	281	351

Common Stock (Preferred Stock Redemption) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Earnings Per Share [Abstract]
Preferred Stock, Dividend Rate, Percentage	6.00%
Preferred stock, par value	$ 1.00	$ 1		$ 1		$ 1
Stock Redeemed or Called During Period, Shares	6,000,000
Preferred Stock, Redemption Price Per Share	$ 25
Preferred Stock Dividends		$ 7,466	$ 2,250	$ 11,966	$ 6,750
Preferred Stock Redemption Premium				$ 5,200

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Dec. 31, 2019

Dec. 31, 2018

Other Comprehensive Income Before Reclassifications

$ 343,435

$ 144,173

$ 343,435

$ 144,173

$ 110,444

$ (64,669)

332,285

274,744

Reclassified from Accumulated Oher Comprehensive Income

(21,631)

3,710

310,654

278,454

(77,663)

(69,612)

Reclassification Where Impairment Was Not Previously Recognized

(5,826)

35,275

232,991

208,842

0

Cumulative Effect, Period of Adoption, Adjustment

Cumulative Effect, Period of Adoption, Adjusted Balance

0

Unrealized Gain Loss on Securities OTTI [Member]

110,444

Other Comprehensive Income Before Reclassifications

^[1]

0

3,464

0

3,464

3,264

3,861

^[1]

0

(709)

Reclassified from Accumulated Oher Comprehensive Income

^[1]

0

133

^[1]

0

(576)

^[1]

0

144

Reclassification Where Impairment Was Not Previously Recognized

^[1]

0

(432)

0

35

Unrealized Gain Loss on Securities OTTI [Member] | Cumulative Effect, Period of Adoption, Adjustment

Unrealized Gain Loss on Securities OTTI [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance

^[1]

(3,264)

Unrealized Gain Loss on Securities Other [Member]

0

Other Comprehensive Income Before Reclassifications

^[1]

267,537

119,108

267,537

119,108

98,809

(52,278)

^[1]

237,583

229,288

Reclassified from Accumulated Oher Comprehensive Income

^[1]

(16,965)

(728)

^[1]

220,618

228,560

^[1]

(55,154)

(57,139)

Reclassification Where Impairment Was Not Previously Recognized

^[1]

165,464

171,421

0

(35)

Unrealized Gain Loss on Securities Other [Member] | Cumulative Effect, Period of Adoption, Adjustment

Unrealized Gain Loss on Securities Other [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance

^[1]

3,264

102,073

Pension Loss [Member]

Other Comprehensive Income Before Reclassifications

(20,902)

(21,941)

(20,902)

(21,941)

(21,940)

(23,107)

0

Reclassified from Accumulated Oher Comprehensive Income

1,384

1,554

1,384

1,554

(346)

(388)

Reclassification Where Impairment Was Not Previously Recognized

1,038

1,166

0

Pension Loss [Member] | Cumulative Effect, Period of Adoption, Adjustment

Pension Loss [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance

0

Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]

(21,940)

Other Comprehensive Income Before Reclassifications

^[2]

$ 96,800

$ 43,542

96,800

43,542

30,311

$ 6,855

^[2]

94,702

46,165

Reclassified from Accumulated Oher Comprehensive Income

^[2]

(6,050)

2,751

^[2]

88,652

48,916

^[2]

(22,163)

(12,229)

Reclassification Where Impairment Was Not Previously Recognized

^[2]

66,489

36,687

$ 0

Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment

Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance

^[2]

0

$ 30,311

[1]	The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.
[2]	The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income.

Segments Segments (Narrative) (Details)	3 Months Ended		9 Months Ended
Segments Segments (Narrative) (Details)	Sep. 30, 2020 USD ($) Locations	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Operating_Segments Locations	Sep. 30, 2019 USD ($)
Segments [Abstract]
Number of Operating Segments \| Operating_Segments			3
Number Of Locations \| Locations	160		160
Segment Reporting Information, Intersegment Revenue \| $	$ 0	$ 0	$ 0	$ 0

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Segments (Schedule Of Financial Information By Segment) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

$ 215,962

$ 203,512

$ 620,084

$ 618,634

(3,101)

(10,963)

(141,593)

(35,232)

129,572

132,743

370,750

381,242

16,155

4,909

(1,275)

^[1]

3,874

^[1]

(190,858)

(191,020)

(572,068)

(572,224)

Consumer Segment [Member]

167,730

139,181

275,898

396,294

80,944

80,111

241,195

236,215

(7,654)

(10,757)

(23,885)

(33,061)

37,116

36,049

107,492

98,840

0

(73,074)

(73,872)

(225,791)

(223,355)

Commercial Segment [Member]

37,332

31,531

99,011

78,639

111,807

85,402

300,307

256,649

(200)

(345)

(3,122)

(1,053)

47,920

53,462

143,747

151,655

0

(78,283)

(76,105)

(237,350)

(231,790)

81,244

62,414

203,582

175,461

Wealth Segment [Member]

15,310

11,525

41,686

35,662

13

(197)

10

(165)

47,701

45,721

139,700

133,556

0

(31,013)

(30,248)

(93,156)

(91,708)

32,011

26,801

88,240

77,345

Segment Totals [Member]

208,061

177,038

583,188

528,526

(7,841)

(11,299)

(26,997)

(34,279)

132,737

135,232

390,939

384,051

0

(182,370)

(180,225)

(556,297)

(546,853)

Other Elimination [Member]

150,587

120,746

390,833

331,445

7,901

26,474

36,896

90,108

4,740

336

(114,596)

(953)

(3,165)

(2,489)

(20,189)

(2,809)

16,155

4,909

(1,275)

3,874

(8,488)

(10,795)

(15,771)

(25,371)

$ 17,143

$ 18,435

$ (114,935)

$ 64,849

[1]	Available for sale debt securities, equity securities, and other securities.

Derivative Instruments Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands

9 Months Ended

Sep. 30, 2020

Oct. 01, 2020

Dec. 31, 2019

$ 3,548,498

$ 4,525,856

Interest Rate Floor [Member]

^[1]

147,850

105,674

Derivative, Floor Interest Rate

$ 500,000

1,500,000

2.00%

Derivative, Effective Date

Dec. 15, 2020

Derivative, Maturity Date

Dec. 15, 2026

Premium paid for interest rate floor cash flow hedge

$ 10,700

Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge

6 years 2 months 12 days

Unrealized gain (loss) on interest rate cash flow hedges, net of tax, amount recorded in accumulated other comprehensive income

$ 38,700

Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net

(1,400)

Interest Rate Floor [Member] | Subsequent Event [Member]

Cash Flow Hedge Gain Loss Reclassified Into OCI before Tax

$ 37,600

Interest Rate Swaps [Member]

Variation Margin Impact to Positive Fair Values of Cleared Swaps

2,425,837

2,606,181

0

(617)

Variation Margin Impact to Negative Fair Values of Cleared Swaps

(77,800)

$ (28,500)

Monetized Interest Rate Floor [Member]

1,000,000

Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred

115,900

$ 90,400

Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer

5 years 8 months 12 days

[1]	* The fair value of each class of derivative is shown in Note 11.

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 3,548,498	$ 4,525,856
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,425,837	2,606,181
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	500,000	1,500,000
Interest Rate Caps [Member]
Derivative [Line Items]
Derivative, Notional Amount	113,495	59,316
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Derivative, Notional Amount	365,611	316,225
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	9,293	10,936
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	60,311	13,755
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	9,451	1,943
Forward TBA Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 64,500	$ 17,500

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($)
$ in Thousands

Sep. 30, 2020

Dec. 31, 2019

^[1]

$ 147,850

$ 105,674

Designated as Hedging Instrument [Member]

^[1]

(20,370)

(10,219)

47,306

67,192

Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]

0

47,306

67,192

Not Designated as Hedging Instrument [Member]

0

100,544

38,482

Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]

(20,370)

(10,219)

96,866

37,774

Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]

(18,981)

(9,916)

1

4

Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]

(1)

(4)

440

140

Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]

(1,185)

(230)

32

97

Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]

(50)

(32)

3,137

459

Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]

0

29

6

Not Designated as Hedging Instrument [Member] | Forward TBA Contracts [Member]

(6)

(2)

39

2

Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement

$ (147)

$ (35)

[1]	* The fair value of each class of derivative is shown in Note 11.

Derivative Instruments Derivative Instruments (Summary of Cash Flow Hedge Activity) (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (4,481)	$ 17,760	$ 94,702	$ 46,165
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(4,087)	31,422	121,621	77,559
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	(394)	(13,662)	(26,919)	(31,394)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,163	(1,042)	6,050	(2,751)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	5,509	0	9,458	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(1,346)	(1,042)	(3,408)	(2,751)
Interest Rate Floor [Member]
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(4,481)	17,760	94,702	46,165
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(4,087)	31,422	121,621	77,559
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	(394)	(13,662)	(26,919)	(31,394)
Interest and Fee Income on Loans [Member] \| Interest Rate Floor [Member]
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,163	(1,042)	6,050	(2,751)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	5,509	0	9,458	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ (1,346)	$ (1,042)	$ (3,408)	$ (2,751)

Derivative Instruments (Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (105)	$ 25	$ 2,675	$ 2,191
Other Non-Interest Income [Member] \| Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	81	1,519	369	2,646
Other Non-Interest Income [Member] \| Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	1	0	20	0
Other Non-Interest Income [Member] \| Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(87)	37	153	78
Other Non-Interest Income [Member] \| Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	0	(5)	(82)	(2)
Loans Fees And Sales [Member] \| Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	589	(112)	2,678	287
Loans Fees And Sales [Member] \| Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	20	(2)	19	1
Loans Fees And Sales [Member] \| Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (709)	$ (1,412)	$ (482)	$ (819)

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($)
$ in Thousands

Sep. 30, 2020

Dec. 31, 2019

$ 147,850

$ 105,674

Derivative Asset, Amount Offset by Liabiilty

0

Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement

^[1]

147,850

105,674

20,370

10,219

Derivative Liability, Amount Offset by Asset

0

Derivative Subject to Master Netting Agreement [Member]

^[1]

20,370

10,219

Derivative Asset, Fair Value, Gross Asset

144,440

105,147

Derivative Asset, Amount Offset by Liabiilty

0

Derivative Asset, Net Amount Presented in the Balance Sheet

144,440

105,147

Derivative Asset, Not Offset, Policy Election Deduction

(9,933)

(8,104)

derivatve asset, fair value of collateral

(37,441)

(59,525)

Derivative Asset, Fair Value, Amount Offset Against Collateral

97,066

37,518

Derivative Liability, Fair Value, Gross Liability

19,915

10,083

Derivative Liability, Amount Offset by Asset

0

Derivative Liability, Net Amount Presented in the Balance Sheet

19,915

10,083

Derivative Liability, Not Offset, Policy Election Deduction

(9,933)

(8,104)

Derivative Liability, Fair Value of Collateral

(8,719)

(437)

Derivative Liability, Fair Value, Amount Offset Against Collateral

1,263

1,542

Derivative Not Subject to Master Netting Agreement [Member]

Derivative Asset, Fair Value, Gross Asset

3,410

527

Derivative Asset, Amount Offset by Liabiilty

0

Derivative Asset, Not Subject to Master Netting Arrangement

3,410

527

Derivative Liability, Fair Value, Gross Liability

455

136

Derivative Liability, Amount Offset by Asset

0

Derivative Liability, Not Subject to Master Netting Arrangement

$ 455

$ 136

[1]	* The fair value of each class of derivative is shown in Note 11.

Resale and Repurchase Agreements Resale and Repurchase Agreements (Narrative) (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Balance Sheet Offsetting [Line Items]
Collateral Swap Agreements	$ 200.0	$ 200.0
Collateral Already Posted, Aggregate Fair Value	209.6
Collateral Accepted, Aggregate Fair Value	$ 209.0

Resale and Repurchase Agreements Resale and Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	$ 1,050,000	$ 1,050,000
Securities Purchased under Agreements to Resell, Liability	(200,000)	(200,000)
Securities purchased under agreements to resell	850,000	850,000
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(850,000)	(850,000)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	0
Repurchase agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	1,846,294	2,030,737
Securities Sold under Agreements to Repurchase, Asset	(200,000)	(200,000)
Securities Sold under Agreements to Repurchase	1,646,294	1,830,737
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,646,294)	(1,830,737)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0

Resale and Repurchase Agreements Remaining Contractual Maturities of Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
U.S. Government and Federal Agency Obligations [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 146,935	$ 526,283
U.S. Government and Federal Agency Obligations [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
U.S. Government and Federal Agency Obligations [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
U.S. Government and Federal Agency Obligations [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	146,935	526,283
Government-Sponsored Enterprise Obligations [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	21,386	32,575
Government-Sponsored Enterprise Obligations [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Government-Sponsored Enterprise Obligations [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Government-Sponsored Enterprise Obligations [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	21,386	32,575
Agency Mortgage-Backed Securities [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,167,467	973,774
Agency Mortgage-Backed Securities [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	58,729	48,517
Agency Mortgage-Backed Securities [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	214,896	227,802
Agency Mortgage-Backed Securities [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,441,092	1,250,093
Non Agency Mortgage Backed Securities [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	98,651	71,399
Non Agency Mortgage Backed Securities [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non Agency Mortgage Backed Securities [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non Agency Mortgage Backed Securities [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	98,651	71,399
Asset-Backed Securities [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	103,861	60,012
Asset-Backed Securities [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	40,000
Asset-Backed Securities [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Asset-Backed Securities [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	103,861	100,012
Other Debt Securities [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	34,369	50,375
Other Debt Securities [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other Debt Securities [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other Debt Securities [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	34,369	50,375
Repurchase Agreements [Member] \| Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,572,669	1,714,418
Repurchase Agreements [Member] \| Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	58,729	88,517
Repurchase Agreements [Member] \| Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	214,896	227,802
Repurchase Agreements [Member] \| Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 1,846,294	$ 2,030,737

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 3.8	$ 3.5	$ 11.2	$ 10.4
Nonvested Stock Award [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Nonvested Stock Award [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			7 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Contractual terms of stock options granted (in years)			10 years

Stock-Based Compensation (Summary Of The Status Of Nonvested Share Awards) (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Nonvested Share Awards [Roll Forward]
Nonvested, Shares, Beginning Balance \| shares	1,104,211
Granted, Shares \| shares	218,257
Vested, Shares \| shares	(275,070)
Forfeited, Shares \| shares	(6,730)
Nonvested, Shares, Ending Balance \| shares	1,040,668
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 47.57
Granted , Weighted Average Grant Date Fair Value \| $ / shares	64.22
Vested , Weighted Average Grant Date Fair Value \| $ / shares	33.97
Forfeited , Weighted Average Grant Date Fair Value \| $ / shares	55.42
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 54.61

Stock-Based Compensation Stock-Based Compensation (Current Year Per Share Average Fair Value and Valuation Model Assumptions) (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares
Current Year Per Share Average Fair Value and Valuation Model Assumptions [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 10.12
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	20.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years 9 months 18 days

Stock-Based Compensation (Summary Of SAR Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares	997,247	1,049,816
Granted, Shares	103,210
Forfeited, Shares	(5,600)
Expired, Shares	(150)
Exercised, Shares	(150,029)
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 43.55
Granted, Weighted Average Exercise Price	63.18
Forfeited, Weighted Average Exercise Price	58.15
Expired, Weighted Average Exercise Price	57.07
Exercised, Weighted Average Exercise Price	34.52
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 46.86
Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 10,582

Revenue from Contracts with Customers Revenue from Contracts with Customers (Narrative) (Details)	9 Months Ended
	Sep. 30, 2020 Rate
Revenue from Contract with Customer [Abstract]
Percent of Revenue not in scope of ASC 606	63.00%

Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Revenue from Contracts with Customers In Scope of ASC 606 [Member]

$ 129,572

$ 132,743

$ 370,750

$ 381,242

Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Bank Card Transaction Fees [Member]

113,326

121,973

334,374

351,700

Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Trust Fees [Member]

37,873

44,510

111,818

126,800

Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Deposit Account Charges and Other Fees [Member]

40,769

39,592

118,676

115,223

Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Consumer Brokerage Services [Member]

23,107

24,032

69,063

71,009

Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Other Non-Interest Income [Member]

4,011

4,030

11,099

11,665

Revenue Not In Scope of ASC 606 [Member]

7,566

9,809

23,718

27,003

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

^[1]

$ 16,246

$ 10,770

$ 36,376

$ 29,542

[1]	This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions.

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Bank Card Transaction Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 11,501	$ 13,915	$ 10,871	$ 13,035
Trust Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	2,122	2,093	2,666	2,721
Deposit Account Charges and Other Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	5,839	6,523	5,154	6,107
Consumer Brokerage Services [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 476	$ 596	$ 655	$ 559

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments	$ 78,462	$ 94,122
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction Rate Securities Available For Sale	7,900
Private equity investments	$ 78,462	$ 94,122

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)

Sep. 30, 2020

Dec. 31, 2019

$ 35,076,000

$ 9,181,000

835,058,000

851,776,000

95,301,000

139,277,000

1,969,144,000

1,267,927,000

6,081,802,000

3,937,964,000

332,970,000

809,782,000

1,658,579,000

1,233,489,000

566,207,000

331,411,000

Equity securities with a readily determinable fair value

25,805,000

28,161,000

2,803,000

2,929,000

78,462,000

94,122,000

Assets held in trust for deferred compensation plan

^[1]

147,850,000

105,674,000

17,294,000

16,518,000

11,846,351,000

8,828,211,000

Liabilities held in trust for deferred compensation plan

^[1]

20,370,000

10,219,000

17,294,000

16,518,000

Fair Value, Inputs, Level 1 [Member]

37,664,000

26,737,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0

835,058,000

851,776,000

0

0

0

0

0

0

Equity securities with a readily determinable fair value

0

2,803,000

2,929,000

0

Assets held in trust for deferred compensation plan

^[1]

0

17,294,000

16,518,000

855,155,000

871,223,000

Liabilities held in trust for deferred compensation plan

^[1]

0

17,294,000

16,518,000

Significant Other Observable Inputs (Level 2) [Member]

17,294,000

16,518,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

35,076,000

9,181,000

0

95,301,000

139,277,000

1,961,278,000

1,258,074,000

6,081,802,000

3,937,964,000

332,970,000

809,782,000

1,658,579,000

1,233,489,000

566,207,000

331,411,000

Equity securities with a readily determinable fair value

25,805,000

28,161,000

0

0

Assets held in trust for deferred compensation plan

^[1]

144,273,000

105,075,000

0

10,901,291,000

7,852,414,000

Liabilities held in trust for deferred compensation plan

^[1]

19,185,000

9,989,000

0

Significant Unobservable Inputs (Level 3) [Member]

19,185,000

9,989,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

0

0

0

7,866,000

9,853,000

0

0

0

0

Equity securities with a readily determinable fair value

0

0

78,462,000

94,122,000

Assets held in trust for deferred compensation plan

^[1]

3,577,000

599,000

0

89,905,000

104,574,000

Liabilities held in trust for deferred compensation plan

^[1]

1,185,000

230,000

0

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

$ 1,185,000

$ 230,000

[1]	* The fair value of each class of derivative is shown in Note 11.

Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Total gains or losses (realized /unrealized), included in earnings

$ 85,224

$ 98,935

$ 104,344

$ 100,307

2,893

1,945

(15,284)

(633)

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[1]

271

(65)

(101)

294

2,000

(1,715)

2,000

(4,635)

105

36

114

80

2,522

5,010

2,791

14,899

(295)

0

(364)

(6,150)

0

29

31

0

200

0

226

(241)

(809)

(314)

Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end

88,720

104,105

88,720

104,105

5,459

2,880

(14,834)

(1,532)

Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total

258

0

(52)

0

State and Municipal Obligations [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Total gains or losses (realized /unrealized), included in earnings

9,490

11,641

9,853

14,158

0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[1]

271

(65)

(101)

294

2,000

(1,715)

(2,000)

(4,635)

105

36

114

80

0

0

0

0

0

Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end

7,866

9,897

7,866

9,897

0

Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total

258

0

(52)

0

Private Equity Funds [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Total gains or losses (realized /unrealized), included in earnings

73,846

86,411

94,122

85,659

2,389

2,020

(18,116)

(998)

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[1]

0

0

0

2,522

5,010

2,791

14,899

(295)

0

(364)

(6,150)

0

29

31

0

0

Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end

78,462

93,441

78,462

93,441

2,409

2,020

(18,096)

(2,448)

Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total

0

Derivative Level Three Unobservable Inputs [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Total gains or losses (realized /unrealized), included in earnings

1,888

883

369

490

504

(75)

2,832

365

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

^[1]

0

0

0

0

0

0

0

200

0

226

(241)

(809)

(314)

Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end

2,392

767

2,392

767

3,050

860

3,262

916

Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total

$ 0

[1]	* Included in "net unrealized gains (losses) on other securities" in the consolidated statements of comprehensive income.

Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 2,893	$ 1,945	$ (15,284)	$ (633)
Change in unrealized gains or losses relating to assets still held	5,459	2,880	(14,834)	(1,532)
Loans Fees And Sales [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	591	(112)	2,679	287
Change in unrealized gains or losses relating to assets still held	3,137	823	3,137	823
Other Non-Interest Income [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(87)	37	153	78
Change in unrealized gains or losses relating to assets still held	(87)	37	125	93
Investment Securities Gains (Losses), Net [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	2,389	2,020	(18,116)	(998)
Change in unrealized gains or losses relating to assets still held	$ 2,409	$ 2,020	$ (18,096)	$ (2,448)

Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details)

9 Months Ended

Sep. 30, 2020

Rate

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Auction Rate Securities [Member]

Discounted cash flow

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Unobservable Input, Estimated market recovery period

Discounted cash flow

5 years

Auction Rate Securities [Member] | Minimum [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Unobservable Input, Estimated market rate

1.90%

Auction Rate Securities [Member] | Maximum [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Unobservable Input, Estimated market rate

2.30%

Auction Rate Securities [Member] | Weighted Average [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Unobservable Input, Estimated market recovery period

5 years

^[1]

Unobservable Input, Estimated market rate

1.90%

^[1]

Private Equity Investments [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Valuation Technique, Market comparable companies

Market comparable companies

Private Equity Investments [Member] | Minimum [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Fair Value inputs, Earnings before interest, taxes, depreciation, amortization (EBITDA) multiple

4.0

Private Equity Investments [Member] | Maximum [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Fair Value inputs, Earnings before interest, taxes, depreciation, amortization (EBITDA) multiple

6.0

Private Equity Investments [Member] | Weighted Average [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Fair Value inputs, Earnings before interest, taxes, depreciation, amortization (EBITDA) multiple

5.3

^[1]

Mortgage Loan Commitments [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Mortgage Loan Commitments [Member] | Minimum [Member]

Discounted cash flow

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Probability of Funding

58.70%

Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow

0.60%

Mortgage Loan Commitments [Member] | Maximum [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Probability of Funding

99.80%

Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow

1.00%

Mortgage Loan Commitments [Member] | Weighted Average [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Probability of Funding

84.10%

^[1]

Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow

0.90%

^[1]

[1]	* Unobservable inputs were weighted by the relative fair value of the instruments.

Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 11,772	$ 171
Loans Nonrecurring Basis Gains (Losses)	(3,214)	(139)
Mortgage servicing rights	5,731	7,235
Mortgage Servicing Rights Nonrecurring Basis Gains (Losses)	(1,823)	(404)
Long-lived assets	0	820
Long Lived Assets Nonrecurring Basis Gains Losses	0	(318)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Mortgage servicing rights	0	0
Long-lived assets	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Mortgage servicing rights	0	0
Long-lived assets	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	11,772	171
Mortgage servicing rights	5,731	7,235
Long-lived assets	$ 0	$ 820

Fair Value Measurements and Disclosures (Schedule of Quantitative Information about Level Three Fair Value Measurements - Nonrecurring Basis) (Details)

9 Months Ended

Sep. 30, 2020

USD ($)

Fair Value Measurement Inputs and Valuation Techniques [Line Items]