Commerce Bancshares (CBSH) 10-K 25 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information Document - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Entity Listings [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	0-2989
Entity Registrant Name	COMMERCE BANCSHARES, INC.
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-0889454
Entity Address, Address Line One	1000 Walnut,
Entity Address, City or Town	Kansas City,
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64106
City Area Code	816
Local Phone Number	234-2000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 6,067,000,000
Entity Common Stock, Shares Outstanding		112,086,942
Entity Central Index Key	0000022356
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock [Member]
Entity Listings [Line Items]
Title of 12(b) Security	$5 Par Value Common Stock
Trading Symbol	CBSH
Security Exchange Name	NASDAQ
Preferred Stock [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing a 1/1000th intrst in a shr of 6.0% Non-Cum. Perp Pref Stock, Srs B
Trading Symbol	CBSHP
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Loans	$ 14,737,817	$ 14,140,298
Allowance for loan losses	(160,682)	(159,932)
Net loans	14,577,135	13,980,366
Loans held for sale	13,809	20,694
Investment securities:
Debt Securities, Available-for-sale	8,571,626	8,538,041
Trading	28,161	27,059
Equity Securities, FV-NI and without Readily Determinable Fair Value	4,209	4,409
Other Securities	137,892	129,157
Total investment securities	8,741,888	8,698,666
Federal funds sold and short-term securities purchased under agreements to resell	0	3,320
Long-term securities purchased under agreements to resell	850,000	700,000
Interest-bearing Deposits in Banks and Other Financial Institutions	395,850	689,876
Cash and due from banks	491,615	507,892
Land, buildings and equipment – net	370,637	333,119
Goodwill	138,921	138,921
Other intangible assets – net	9,534	8,794
Other assets	476,400	382,194
Total assets	26,065,789	25,463,842
LIABILITIES AND STOCKHOLDERS’ EQUITY
Non-interest bearing	6,890,687	6,980,298
Savings, interest checking and money market	11,621,716	11,685,239
Time open and C.D.’s of less than $100,000	626,157	586,091
Time open and C.D.'s of $100,000 and over	1,381,855	1,072,031
Total deposits	20,520,415	20,323,659
Federal funds purchased and securities sold under agreements to repurchase	1,850,772	1,956,389
Other borrowings	2,418	8,702
Other liabilities	553,712	237,943
Total liabilities	22,927,317	22,526,693
Commerce Bancshares, Inc. stockholders’ equity:
Preferred stock, $1 par value	144,784	144,784
Common stock, $5 par value	563,978	559,432
Capital surplus	2,151,464	2,084,824
Retained earnings	201,562	241,163
Treasury stock, at cost	(37,548)	(34,236)
Accumulated other comprehensive income	110,444	(64,669)
Total Commerce Bancshares, Inc. stockholders’ equity	3,134,684	2,931,298
Non-controlling interest	3,788	5,851
Total equity	3,138,472	2,937,149
Total liabilities and equity	$ 26,065,789	$ 25,463,842

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 9,181,000	$ 13,529,000
Investment Securities:
Available for sale securities, pledged	$ 204,942,000	$ 463,325,000
Stockholders' Equity:
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	6,000	6,000
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	140,000,000	120,000,000
Common stock, shares issued	112,795,605	11,886,450
Treasury stock, shares	445,952	555,100

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INTEREST INCOME
Interest and fees on loans		$ 663,338	$ 625,083	$ 543,825
Interest on loans held for sale		1,209	1,298	1,000
Interest on investment securities		237,487	240,187	214,689
Interest on federal funds sold and short-term securities purchased under agreements to resell		55	519	230
Interest on long-term securities purchased under agreements to resell		15,898	15,881	15,440
Interest on deposits with banks		6,698	6,233	2,223
Total interest income		924,685	889,201	777,407
INTEREST EXPENSE
Savings, interest checking and money market		39,712	27,803	17,309
Certificates of deposit of less than $100,000		6,368	3,215	2,645
Certificates of deposit of $100,000 and over		26,945	14,658	10,859
Interest on federal funds purchased and securities sold under agreements to repurchase		29,415	19,655	9,829
Interest on other borrowings		952	45	3,086
Total interest expense		103,392	65,376	43,728
Net interest income		821,293	823,825	733,679
Provision for loan losses		50,438	42,694	45,244
Net interest income after provision for loan losses		770,855	781,131	688,435
NON-INTEREST INCOME
Bank card transaction fees		167,879	171,576	155,100
Trust fees		155,628	147,964	135,159
Deposit account charges and other fees		95,983	94,517	90,060
Capital market fees		8,146	7,721	7,996
Consumer brokerage		15,804	15,807	14,630
Loan fees and sales		15,767	12,723	13,948
Other		65,496	51,033	44,370
Total non-interest income		524,703	501,341	461,263
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	[1]	3,626	(488)	25,051
NON-INTEREST EXPENSE
Salaries and employee benefits		492,927	468,194	448,321
Net occupancy		47,157	46,044	45,612
Equipment		19,061	18,125	18,568
Supplies and communication		20,394	20,637	22,790
Data processing and software		92,899	85,978	80,998
Marketing		21,914	20,548	16,325
Deposit insurance		6,676	11,546	13,986
Community Service		2,446	2,445	34,377
Other		63,924	64,304	63,366
Total non-interest expense		767,398	737,821	744,343
Income before income taxes		531,786	544,163	430,406
Less income taxes		109,074	105,949	110,506
Net income		422,712	438,214	319,900
Less non-controlling interest expense		1,481	4,672	517
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.		421,231	433,542	319,383
Preferred stock dividends		9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic		$ 412,231	$ 424,542	$ 310,383
Net income per common share - basic (in dollars per share)		$ 3.59	$ 3.61	$ 2.63
Net income per common share - diluted (in dollars per share)		$ 3.58	$ 3.60	$ 2.62
[1]	Available for sale debt securities, equity securities, and other securities.

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 422,712	$ 438,214	$ 319,900
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	(632)	(277)	412
Net unrealized gains (losses) on other securities	151,122	(55,631)	3,022
Change in pension loss	1,167	664	(301)
Unrealized gain (loss) on cash flow hedge derivatives	23,456	6,855	0
Other comprehensive income (loss)	175,113	(48,389)	3,133
Comprehensive income	597,825	389,825	323,033
Non-controlling interest expense	1,481	4,672	517
Comprehensive income attributable to Commerce Bancshares, Inc.	$ 596,344	$ 385,153	$ 322,516

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES:
Net income		$ 422,712	$ 438,214	$ 319,900
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		50,438	42,694	45,244
Provision for depreciation and amortization		41,145	38,679	39,732
Amortization of investment security premiums, net		27,631	26,224	35,423
Deferred income tax (benefit) expense		14,195	5,336	13,617
Investment securities (gains) losses, net	[1]	(3,626)	488	(25,051)
Net gains on sales of loans held for sale		(10,127)	(6,370)	(8,008)
Proceeds from sales of loans held for sale		259,153	208,431	215,373
Origination Of Loans Held For Sale		(244,976)	(203,775)	(216,064)
Net (increase) decrease in trading securities		3,863	(14,277)	7,585
Stock-based compensation		13,854	12,841	12,105
(Increase) decrease in interest receivable		3,316	(4,258)	(4,459)
Increase (decrease) in interest payable		5,586	2,137	38
Increase (decrease) in income taxes payable		14,465	12,288	(27,685)
Donation of securities		0	0	32,036
Gain on sale of Corporate Trust business		(11,472)	0	0
Other changes, net		(73,363)	(5,992)	(13,259)
Net cash provided by (used in) operating activities		512,794	552,660	426,527
INVESTING ACTIVITIES
Proceeds from sales of available for sale securities	[1]	413,203	708,864	792,380
Proceeds from maturities/pay downs of available for sale securities	[1]	1,558,244	1,510,985	1,899,640
Purchases of available for sale securities	[1]	(1,863,180)	(2,090,333)	(1,853,817)
Net (increase) decrease in loans		(647,890)	(200,673)	(614,849)
Repayments of long-term securities purchased under agreements to resell		(150,000)	(100,000)	(75,000)
Proceeds from Securities Purchased under Agreements to Resell		0	100,000	100,000
Purchases of land, buildings and equipment		(42,575)	(33,294)	(30,824)
Sales of land, buildings and equipment		2,033	13,427	3,190
Net cash provided by (used in) investing activities		(730,165)	(91,024)	220,720
FINANCING ACTIVITIES
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		85,438	60,278	(15,036)
Net increase (decrease) in time open and C.D.’s		349,890	(108,742)	(474,044)
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase		(105,617)	449,251	(216,767)
Increase (decrease) in other borrowings		(6,394)	6,944	(100,291)
Purchases of treasury stock		(134,904)	(75,231)	(17,771)
Accelerated stock repurchase agreement		150,000	0	0
Issuance of stock under equity compensation plans		(8)	(10)	(8)
Cash dividends paid on common stock		(113,466)	(100,238)	(91,619)
Cash dividends paid on preferred stock		(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities		(84,061)	223,252	(924,536)
Increase (decrease) in cash and cash equivalents		(301,432)	684,888	(277,289)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Year		1,209,240	524,352	801,641
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Year		907,808	1,209,240	524,352
Supplemental Cash Flow Information:
Income tax payments, net		76,168	84,172	120,744
Interest paid on deposits and borrowings		97,806	63,239	43,690
Loans transferred to foreclosed real estate		$ 581	$ 1,551	$ 2,063
[1]	Available for sale debt securities, equity securities, and other securities.

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interest
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member]	$ 1,297			$ 3,441	$ (2,144)
Balance at Dec. 31, 2016	2,501,132	$ 144,784	$ 510,015	1,552,454	292,849	$ (15,294)	$ 10,975	$ 5,349
Net income	319,900				319,383			517
Other comprehensive income	3,133						3,133
Distributions to non-controlling interest	(1,293)							(1,293)
Sale of non-controlling interest in subsidiary	1			2,950				(2,949)
Purchase of treasury stock	(17,771)					(17,771)
Cash dividends paid on common stock	(91,619)				(91,619)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Stock-based compensation	12,105			12,105
Issuance under stock purchase and equity compensation plans	858			(17,734)		18,592
5% stock dividend, net	(559)		25,392	262,144	(288,095)
Balance at Dec. 31, 2017	2,718,184	144,784	535,407	1,815,360	221,374	(14,473)	14,108	1,624
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]	0				(2,932)		2,932
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	0				33,320		(33,320)
Net income	438,214				433,542			4,672
Other comprehensive income	(48,389)						(48,389)
Distributions to non-controlling interest	(445)							(445)
Purchase of treasury stock	(75,231)					(75,231)
Cash dividends paid on common stock	(100,238)				(100,238)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Stock-based compensation	12,841			12,841
Issuance under stock purchase and equity compensation plans	1,792			(21,632)		23,424
5% stock dividend, net	(579)		24,025	278,255	(334,903)	32,044
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	422,712				421,231			1,481
Other comprehensive income	175,113						175,113
Distributions to non-controlling interest	(3,544)							(3,544)
Purchase of treasury stock	(134,904)					(134,904)
Accelerated share repurchase	(150,000)					(150,000)
Cash dividends paid on common stock	(113,466)				(113,466)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Stock-based compensation	13,854			13,854
Issuance under stock purchase and equity compensation plans	1,351			(19,293)		20,644
5% stock dividend, net	(793)		4,546	72,079	(338,366)	260,948
Balance at Dec. 31, 2019	$ 3,138,472	$ 144,784	$ 563,978	$ 2,151,464	$ 201,562	$ (37,548)	$ 110,444	$ 3,788

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (per share)	$ 0.990	$ 0.853	$ 0.777
Stock dividend rate (percent)	5.00%	5.00%	5.00%
Cash dividends paid on preferred stock (per share)	$ 1.500	$ 1.500	$ 1.500

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 316 branch and ATM locations throughout Missouri, Kansas, Illinois, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, trust, and private banking services. The Company also maintains commercial banking offices in Dallas, Houston, Cincinnati, Nashville, Des Moines, Indianapolis, and Grand Rapids. Basis of Presentation The Company follows accounting principles generally accepted in the United States of America (GAAP) and reporting practices applicable to the banking industry. The preparation of financial statements under GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and notes. These estimates are based on information available to management at the time the estimates are made. While the consolidated financial statements reflect management’s best estimates and judgments, actual results could differ from those estimates. The consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries (after elimination of all material intercompany balances and transactions). Certain prior year amounts have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. Management has evaluated subsequent events for potential recognition or disclosure through the date these consolidated financial statements were issued. The Company, in the normal course of business, engages in a variety of activities that involve variable interest entities (VIEs). A VIE is a legal entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. However, an enterprise is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. An enterprise that is the primary beneficiary must consolidate the VIE. The Company’s interests in VIEs are evaluated to determine if the Company is the primary beneficiary both at inception and when there is a change in circumstances that requires a reconsideration. The Company is considered to be the primary beneficiary in a rabbi trust related to a deferred compensation plan offered to certain employees. The assets and liabilities of this trust, which are included in the accompanying consolidated balance sheets, are not significant. The Company also has variable interests in certain entities in which it is not the primary beneficiary. These entities are not consolidated. These interests include affordable housing limited partnership interests, holdings in its investment portfolio of various asset and mortgage-backed bonds that are issued by securitization trusts, and managed discretionary trust assets that are not included in the accompanying consolidated balance sheets. Cash, Cash Equivalents and Restricted Cash In the accompanying consolidated statements of cash flows, cash and cash equivalents include “Cash and due from banks”, “Federal funds sold and short-term securities purchased under agreements to resell”, and “Interest earning deposits with banks” as segregated in the accompanying consolidated balance sheets. Restricted cash is comprised of cash collateral on deposit with another financial institution to secure interest rate swap transactions. Restricted cash is included in other assets in the consolidated balance sheets and totaled $20.3 million and $8.2 million at December 31, 2019 and 2018 , respectively. Regulations of the Federal Reserve System require cash balances to be maintained at the Federal Reserve Bank, based on certain deposit levels. The minimum reserve requirement for the Bank at December 31, 2019 totaled $160.7 million . Other interest earning cash balances held at the Federal Reserve Bank totaled $395.9 million . Loans and Related Earnings Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of undisbursed loan proceeds, the allowance for loan losses, and 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. Interest on loans is accrued based upon the principal amount outstanding. Interest income is recognized primarily on the level yield method. 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. Non-Accrual Loans Loans are placed on non-accrual status when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Business, construction real estate, business real estate, and personal real estate loans that are contractually 90 days past due as to principal and/or interest payments are generally placed on non-accrual, unless they are both well-secured and in the process of collection. Consumer, revolving home equity and credit card loans are exempt under regulatory rules from being classified as non-accrual. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed against current income, and the loan is charged off to the extent uncollectible. Principal and interest payments received on non-accrual loans are generally applied to principal. Interest is included in income only after all previous loan charge-offs have been recovered and is recorded only as received. The loan is returned to accrual status only when the borrower has brought all past due principal and interest payments current, and, in the opinion of management, the borrower has demonstrated the ability to make future payments of principal and interest as scheduled. A six month history of sustained payment performance is generally required before reinstatement of accrual status. 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 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 in the same manner as described below. Troubled debt restructurings which are performing under their contractual terms continue to accrue interest which is recognized in current earnings. Impaired Loans Loans are evaluated regularly by management for impairment. Included in impaired loans are all non-accrual loans, as well as loans that have been classified as troubled debt restructurings. Once a loan has been identified as impaired, impairment is measured based on either the present value of the expected future cash flows at the loan’s initial effective interest rate or the fair value of the collateral if collateral dependent. Factors considered in determining impairment include delinquency status, cash flow analysis, credit analysis, and collateral value and availability. Loans Held For Sale Loans held for sale include student loans and certain fixed rate residential mortgage loans. These loans are typically classified as held for sale upon origination based upon management's intent to sell the production of these loans. The student loans are carried at the lower of aggregate cost or fair value, and their fair value is determined based on sale contract prices. The mortgage loans are carried at fair value under the elected fair value option. Their fair value is based on secondary market prices for loans with similar characteristics, including an adjustment for embedded servicing value. Changes in fair value and gains and losses on sales are included in loan fees and sales. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Interest income related to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate. Occasionally, other types of loans may be classified as held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains and losses on sales recognized in loan fees and sales. Allowance/Provision for Loan Losses The allowance for loan losses is maintained at a level believed to be appropriate by management to provide for probable loan losses inherent in the portfolio as of the balance sheet date, including losses on known or anticipated problem loans as well as for loans which are not currently known to require specific allowances. Management has established a process to determine the amount of the allowance for loan losses which assesses the risks and losses inherent in its portfolio. Business, construction real estate and business real estate loans are normally larger and more complex, and their collection rates are harder to predict. These loans are more likely to be collateral dependent and are allocated a larger reserve, due to their potential volatility. Personal real estate, credit card, consumer and revolving home equity loans are individually smaller and perform in a more homogenous manner, making loss estimates more predictable. Management’s process provides an allowance consisting of a specific allowance component based on certain individually evaluated loans and a general component based on estimates of reserves needed for pools of loans. Loans subject to individual evaluation generally consist of business, construction real estate, business real estate and personal real estate loans on non-accrual status. These impaired loans are evaluated individually for the impairment of repayment potential and collateral adequacy. Other impaired loans identified as performing troubled debt restructurings are collectively evaluated because they have similar risk characteristics. Loans which have not been identified as impaired are segregated by loan type and sub-type and are collectively evaluated. Reserves calculated for these loan pools are estimated using a consistent methodology that considers historical loan loss experience by loan type, loss emergence periods, delinquencies, current economic factors, loan risk ratings and industry concentrations. The Company’s estimate of the allowance for loan losses and the corresponding provision for loan losses is based on various judgments and assumptions made by management. The amount of the allowance for loan losses is influenced by several qualitative factors which include collateral valuation, evaluation of performance and status, current loan portfolio composition and characteristics, trends in delinquencies, portfolio risk ratings, levels of non-performing assets, and prevailing regional and national economic and business conditions. The estimates, appraisals, evaluations, and cash flows utilized by management may be subject to frequent adjustments due to changing economic prospects of borrowers or properties. These estimates are reviewed periodically and adjustments, if necessary, are recorded in the provision for loan losses in the periods in which they become known. Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for loan losses, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction 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 no collateral) once the loans are more than 120 days delinquent. Credit card loans are charged off against the allowance for loan losses when the receivable is more than 180 days past due. The interest and fee income previously capitalized but not collected on credit card charge-offs is reversed against interest income. Direct Financing and Sales Type Leases The net investment in direct financing and sales type leases is included in loans on the Company’s consolidated balance sheets and consists of the present values of the sum of the future minimum lease payments and estimated residual value of the leased asset. Revenue consists of interest earned on the net investment and is recognized over the lease term as a constant percentage return thereon. 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, excluding certain losses associated with other-than-temporary impairment (OTTI), are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for OTTI in accordance with guidance provided in ASC 320-10-35. For securities with OTTI, 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 likely that it will be required to sell the security before the anticipated recovery. If neither condition is met, but the Company does not expect to recover the amortized cost basis, the Company determines whether a credit loss has occurred, and the loss is then recognized in current earnings. The noncredit-related portion of the overall loss is reported in other comprehensive income (loss). 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. Equity securities include common and preferred stock with readily determinable fair values. These are also carried at fair value. Prior to January 1, 2018, changes in fair value were recorded in other comprehensive income. The Company's adoption of ASU 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities", effective January 1, 2018, required that all subsequent changes in fair value be recorded in current earnings. The adoption also required a reclassification of the unrealized gain in fair value on equity securities (recorded in accumulated other comprehensive income at December 31, 2017) to retained earnings. The amount of this reclassification was $33.3 million , net of tax. Certain equity securities do not have readily determinable fair values. The Company has elected under ASU 2016-01 to measure these 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 investments. 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 other-than-temporary 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. Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions, not as purchases and sales of the underlying securities. The agreements are recorded at the amount of cash advanced or received. The Company periodically enters into securities purchased under agreements to resell with large financial institutions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian. Securities sold under agreements to repurchase are a source of funding to the Company and are offered to cash management customers as an automated, collateralized investment account. From time to time, securities sold may also be used by the Bank to obtain additional borrowed funds at favorable rates. These borrowings are secured by a portion of the Company's investment security portfolio and delivered either to the dealer custody account at the FRB or to the applicable counterparty. The fair value of collateral either received from or provided to a counterparty is monitored daily, and additional collateral is obtained, returned, or provided by the Company in order to maintain full collateralization for these transactions. As permitted by current accounting guidance, the Company offsets certain securities purchased under agreements to resell against securities sold under agreements to repurchase in its balance sheet presentation. These agreements are further discussed in Note 20, Resale and Repurchase Agreements. Premises and Equipment Land is stated at cost, and buildings and equipment are stated at cost, including capitalized interest when appropriate, less accumulated depreciation. Depreciation is computed using a straight-line method, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 10 years for equipment. Leasehold improvements are amortized over the shorter of 10 years or the remaining lease term. Maintenance and repairs are charged to non-interest expense as incurred. Premises and equipment also includes the Company's right-of-use leased assets, which is mainly comprised of operating leases for branches, office space, ATM locations, and certain equipment. Foreclosed Assets Foreclosed assets consist of property that has been repossessed and is comprised of commercial and residential real estate and other non-real estate property, including auto and recreational and marine vehicles. The assets are initially recorded at fair value less estimated selling costs, establishing a new cost basis. Initial valuation adjustments are charged to the allowance for loan losses. Fair values are estimated primarily based on appraisals, third-party price opinions, or internally developed pricing models. After initial recognition, fair value estimates are updated periodically. Declines in fair value below cost are recognized through valuation allowances which may be reversed when supported by future increases in fair value. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense. Goodwill and Intangible Assets Goodwill is not amortized but is assessed for impairment on an annual basis or more frequently in certain circumstances. When testing for goodwill impairment, the Company may initially perform a qualitative assessment. Based on the results of this qualitative assessment, if the Company concludes it is more likely than not that a reporting unit's fair value is less than its carrying amount, a quantitative analysis is performed. Quantitative valuation methodologies include a combination of formulas using current market multiples, based on recent sales of financial institutions within the Company's geographic marketplace. If the fair value of a reporting unit is less than the carrying amount, additional analysis is required to measure the amount of impairment. The Company has not recorded impairment resulting from goodwill impairment tests. However, adverse changes in the economic environment, operations of the reporting unit, or other factors could result in a decline in fair value. Intangible assets that have finite useful lives, such as core deposit intangibles and mortgage servicing rights, are amortized over their estimated useful lives. Core deposit intangibles are amortized over periods of 8 to 14 years, representing their estimated lives, using accelerated methods. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, considering appropriate prepayment assumptions. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate their carrying amount may not be recoverable. Impairment is indicated if the sum of the undiscounted estimated future net cash flows is less than the carrying value of the intangible asset. Mortgage servicing rights, while initially recorded at fair value, are subsequently amortized and carried at the lower of the initial capitalized amount (net of accumulated amortization), or estimated fair value. The Company evaluates its mortgage servicing rights for impairment on a quarterly basis, using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans. A valuation allowance has been established, through a charge to earnings, to the extent the amortized cost exceeds the estimated fair value. However, the Company has not recorded other-than-temporary impairment losses on either of these types of intangible assets. Income Taxes Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes are provided for temporary differences between the financial reporting bases and income tax bases of the Company’s assets and liabilities, net operating losses, and tax credit carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income when such assets and liabilities are anticipated to be settled or realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as tax expense or benefit in the period that includes the enactment date of the change. In determining the amount of deferred tax assets to recognize in the financial statements, the Company evaluates the likelihood of realizing such benefits in future periods. A valuation allowance is established if it is more likely than not that all or some portion of the deferred tax asset will not be realized. The Company recognizes interest and penalties related to income taxes within income tax expense in the consolidated statements of income. The Company and its eligible subsidiaries file a consolidated federal income tax return. State and local income tax returns are filed on a combined, consolidated or separate return basis based upon each jurisdiction’s laws and regulations. In December 2017, tax reform legislation was enacted that changed the maximum corporate tax rate for years 2018 and beyond. As such, deferred tax assets and liabilities were revalued in 2017 to account for the change in future tax rates. Additional information about current and deferred income taxes is provided in Note 9, Income Taxes. Non-Interest Income Non-interest income is mainly comprised of revenue from contracts with customers. For that revenue (excluding certain revenue associated with financial instruments, derivative and hedging instruments, guarantees, lease contracts, transferring and servicing of financial assets, and other specific revenue transactions), the Company applies the following five-step approach when recognizing revenue: (i) identify the contract with the customer, (ii) identify the performance obligations, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations, and (v) recognize revenue when (or as) the performance obligation is satisfied. The Company’s contracts with customers are generally short term in nature, with a duration of one year or less, and most contracts are cancellable by either the Company or its customer without penalty. Performance obligations for customer contracts are generally satisfied at a single point in time, typically when the transaction is complete and the customer has received the goods or service, or over time. For performance obligations satisfied over time, the Company recognizes the value of the goods or services transferred to the customer when the performance obligations have been transferred and received by the customer. Payments for satisfied performance obligations are typically due when or as the goods or services are completed, or shortly thereafter, which usually occurs within a single financial reporting period. In situations where payment is made before the performance obligation is satisfied, the fees are deferred until the performance obligations pertaining to those goods or services are completed. In cases where payment has not been received despite satisfaction of its performance obligations, the Company accrues an estimate of the amount due in the period that the performance obligations have been satisfied. For contracts with variable components, the Company only recognizes revenue to the extent that it is probable that the cumulative amount recognized will not be subject to a significant reversal in future periods. Generally, the Company’s contracts do not include terms that require significant judgment to determine whether a variable component is included within the transaction price. The Company generally acts in a principal capacity, on its own behalf, in most of its contracts with customers. For these transactions, revenue and the related costs to provide the goods or services are presented on a gross basis in the financial statements. In some cases, the Company acts in an agent capacity, deriving revenue through assisting third parties in transactions with the Company’s customers. In such transactions, revenue and the related costs to provide services is presented on a net basis in the financial statements. These transactions primarily relate to fees earned from bank card and related network and rewards costs and the sales of annuities and certain limited insurance products. Derivatives Most of the Company's derivative contracts are accounted for as free-standing instruments. These instruments are carried at fair value, and changes in fair value are recognized in current earnings. They include interest rate swaps and caps, which are offered to customers to assist in managing their risks of adverse changes in interest rates. Each contract between the Company and a customer is offset by a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company also enters into certain contracts, known as credit risk participation agreements, to buy or sell credit protection on specific interest rate swaps. It also purchases and sells forward foreign exchange contracts, either in connection with customer transactions, or for its own trading purposes. In 2015, the Company began an origination and sales program of certain personal real estate mortgages. Derivative instruments under this program include mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities. The Company's interest rate risk management policy permits the use of hedge accounting for derivatives, and the Company has entered into interest rate floor contracts as protection from the potential for declining interest rates in the commercial loan portfolio. These floors were designated and qualified as cash flow hedges. In a cash flow hedge, the changes in fair value are recorded in accumulated other comprehensive income and recognized in the income statement when the hedged cash flows affect earnings. Both at hedge inception and on an ongoing basis, the Company assesses whether the interest rate floors used in the hedging relationships are highly effective in offsetting changes in the cash flows of the hedged items. The Company has master netting arrangements with various counterparties but does not offset derivative assets and liabilities under these arrangements in its consolidated balance sheets. However, interest rate swaps that are executed under central clearing requirements are presented net of variation margin as mandated by the statutory terms of the Company's contract with its clearing counterparty. Additional information about derivatives held by the Company and valuation methods employed is provided in Note 17, Fair Value Measurements and Note 19, Derivative Instruments. Pension Plan The Company’s pension plan is described in Note 10, Employee Benefit Plans. Historically, the Company has reported all components of net periodic pension cost in salaries and employee benefits in its consolidated statements of income. Upon the adoption of ASU 2017-07 "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost", in 2018, only the service cost component of net periodic pension cost is reported in salaries and employee benefits in the accompanying consolidated statements of income, while the other components are reported in other non-interest expense. The funded status of the plan is recognized as an asset or liability in the consolidated balance sheets, and changes in that funded status are recognized in the year in which the changes occur through other comprehensive income. Plan assets and benefit obligations are measured as of the fiscal year end of the plan. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated. Stock-Based Compensation The Company’s stock-based employee compensation plan is described in Note 11, Stock-Based Compensation and Directors Stock Purchase Plan.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2019
Loans And Allowance For Loan Losses [Abstract]
Loans And Allowance For Loan Losses	Loans and Allowance for Loan Losses Major classifications within the Company’s held for investment loan portfolio at December 31, 2019 and 2018 are as follows: (In thousands) 2019 2018 Commercial: Business $ 5,565,449 $ 5,106,427 Real estate — construction and land 899,377 869,659 Real estate — business 2,833,554 2,875,788 Personal Banking: Real estate — personal 2,354,760 2,127,083 Consumer 1,964,145 1,955,572 Revolving home equity 349,251 376,399 Consumer credit card 764,977 814,134 Overdrafts 6,304 15,236 Total loans $ 14,737,817 $ 14,140,298 Loans to directors and executive officers of the Parent and the Bank, and to their affiliates, are summarized as follows: (In thousands) Balance at January 1, 2019 $ 46,728 Additions 133,607 Amounts collected (123,956 ) Amounts written off — Balance, December 31, 2019 $ 56,379 Management believes all loans to directors and executive officers have been made in the ordinary course of business with normal credit terms, including interest rate and collateral considerations, and do not represent more than a normal risk of collection. The activity in the table above includes draws and repayments on several lines of credit with business entities. There were no outstanding loans at December 31, 2019 to principal holders (over 10% ownership) of the Company’s common stock. The Company’s lending activity is generally centered in Missouri, Kansas, Illinois and other nearby states including Oklahoma, Colorado, Iowa, Ohio, Texas, and others. The Company maintains a diversified portfolio with limited industry concentrations of credit risk. Loans and loan commitments are extended under the Company’s normal credit standards, controls, and monitoring features. Most loan commitments are short or intermediate term in nature. Commercial loan maturities generally range from one to seven years. Collateral is commonly required and would include such assets as marketable securities and cash equivalent assets, accounts receivable and inventory, equipment, other forms of personal property, and real estate. At December 31, 2019 , unfunded loan commitments totaled $11.2 billion (which included $5.1 billion in unused approved lines of credit related to credit card loan agreements) which could be drawn by customers subject to certain review and terms of agreement. At December 31, 2019 , loans totaling $4.0 billion were pledged at the FHLB as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $1.6 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings. The Company has a net investment in direct financing and sales type leases to commercial and industrial and tax-exempt entities of $795.8 million and $752.2 million at December 31, 2019 and 2018 , respectively, which is included in business loans on the Company’s consolidated balance sheets. This investment includes deferred income of $71.8 million and $62.6 million at December 31, 2019 and 2018 , respectively. The net investment in operating leases amounted to $14.7 million and $16.1 million at December 31, 2019 and 2018 , respectively, and is included in other assets on the Company’s consolidated balance sheets. Allowance for loan losses A summary of the activity in the allowance for losses during the previous three years follows: (In thousands) Commercial Personal Banking Total Balance at December 31, 2016 $ 91,361 $ 64,571 $ 155,932 Provision for loan losses 2,327 42,917 45,244 Deductions: Loans charged off 2,538 52,641 55,179 Less recoveries 2,554 10,981 13,535 Net loans charged off (recoveries) (16 ) 41,660 41,644 Balance at December 31, 2017 93,704 65,828 159,532 Provision for loan losses 254 42,440 42,694 Deductions: Loans charged off 3,164 52,657 55,821 Less recoveries 2,075 11,452 13,527 Net loans charged off 1,089 41,205 42,294 Balance at December 31, 2018 92,869 67,063 159,932 Provision for loan losses 2,816 47,622 50,438 Deductions: Loans charged off 4,711 57,169 61,880 Less recoveries 786 11,406 12,192 Net loans charged off 3,925 45,763 49,688 Balance at December 31, 2019 $ 91,760 $ 68,922 $ 160,682 The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2019 and 2018 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under 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 December 31, 2018 Commercial $ 1,780 $ 61,496 $ 91,089 $ 8,790,378 Personal Banking 916 17,120 66,147 5,271,304 Total $ 2,696 $ 78,616 $ 157,236 $ 14,061,682 Impaired loans The table below shows the Company’s investment in impaired loans at December 31, 2019 and 2018 . 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 below. (In thousands) 2019 2018 Non-accrual loans $ 10,220 $ 12,536 Restructured loans (accruing) 71,512 66,080 Total impaired loans $ 81,732 $ 78,616 The following table provides additional information about impaired loans held by the Company at December 31, 2019 and 2018 , 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 December 31, 2018 With no related allowance recorded: Business $ 8,725 $ 14,477 $ — $ 8,725 $ 14,477 $ — With an allowance recorded: Business $ 40,286 $ 40,582 $ 1,223 Real estate – construction and land 416 421 11 Real estate – business 12,069 12,699 546 Real estate – personal 4,461 6,236 266 Consumer 5,510 5,510 38 Revolving home equity 40 40 1 Consumer credit card 7,109 7,109 611 $ 69,891 $ 72,597 $ 2,696 Total $ 78,616 $ 87,074 $ 2,696 Total average impaired loans during 2019 and 2018 are shown in the table below. 2019 2018 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Average impaired loans: Non-accrual loans $ 9,892 $ 2,031 $ 11,923 $ 7,619 $ 2,122 $ 9,741 Restructured loans (accruing) 49,544 15,667 65,211 73,261 16,526 89,787 Total $ 59,436 $ 17,698 $ 77,134 $ 80,880 $ 18,648 $ 99,528 The table below shows interest income recognized during the years ended December 31, 2019 , 2018 and 2017 for impaired loans held at the end of each respective period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section below. Years Ended December 31 (In thousands) 2019 2018 2017 Interest income recognized on impaired loans: Business $ 1,329 $ 2,219 $ 3,135 Real estate – construction and land 2 25 41 Real estate – business 1,456 558 514 Real estate – personal 136 139 402 Consumer 286 305 307 Revolving home equity 3 3 10 Consumer credit card 828 746 673 Total $ 4,040 $ 3,995 $ 5,082 Delinquent and non-accrual 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 December 31, 2019 and 2018 . (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 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 December 31, 2018 Commercial: Business $ 5,086,912 $ 10,057 $ 473 $ 8,985 $ 5,106,427 Real estate – construction and land 867,692 1,963 — 4 869,659 Real estate – business 2,867,347 6,704 22 1,715 2,875,788 Personal Banking: Real estate – personal 2,118,045 6,041 1,165 1,832 2,127,083 Consumer 1,916,320 35,608 3,644 — 1,955,572 Revolving home equity 374,830 875 694 — 376,399 Consumer credit card 792,334 11,140 10,660 — 814,134 Overdrafts 14,937 299 — — 15,236 Total $ 14,038,417 $ 72,687 $ 16,658 $ 12,536 $ 14,140,298 Credit quality The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. 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 material 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. 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 December 31, 2018 Pass $ 4,915,042 $ 866,527 $ 2,777,374 $ 8,558,943 Special mention 84,391 1,917 51,845 138,153 Substandard 98,009 1,211 44,854 144,074 Non-accrual 8,985 4 1,715 10,704 Total $ 5,106,427 $ 869,659 $ 2,875,788 $ 8,851,874 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 "Delinquent and non-accrual loans" . 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. 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 $198.2 million at December 31, 2019 and $201.7 million at December 31, 2018 . The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $199.2 million at December 31, 2019 and $170.3 million at December 31, 2018 . 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 8% 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 December 31, 2019 and 2018 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card 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 % December 31, 2018 FICO score: Under 600 1.1 % 3.1 % 0.8 % 4.4 % 600 – 659 1.8 4.8 1.7 14.0 660 – 719 9.4 16.1 9.1 34.8 720 – 779 24.7 25.7 24.0 26.4 780 and over 63.0 50.3 64.4 20.4 Total 100.0 % 100.0 % 100.0 % 100.0 % Troubled debt restructurings As mentioned previously, the Company's impaired loans include loans which have been classified as troubled debt restructurings, as shown in the table below. 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. December 31 (In thousands) 2019 2018 Accruing loans: Commercial $ 55,934 $ 50,904 Assistance programs 8,365 7,410 Consumer bankruptcy 3,592 4,103 Other consumer 3,621 3,663 Non-accrual loans 7,938 9,759 Total troubled debt restructurings $ 79,450 $ 75,839 The table below shows the balance of troubled debt restructurings by loan classification at December 31, 2019 , 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) December 31, 2019 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 37,055 $ — Real estate – construction and land 44 — Real estate – business 25,933 — Personal Banking: Real estate – personal 3,915 347 Consumer 4,421 83 Revolving home equity 35 — Consumer credit card 8,047 987 Total troubled debt restructurings $ 79,450 $ 1,417 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 $1.2 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 loan 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 loan 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 loan losses is determined based on individual evaluation, or if necessary, the loan is charged off and collection efforts begin. The Company had commitments of $4.7 million at December 31, 2019 to lend additional funds to borrowers with restructured loans, compared to $1.8 million at December 31, 2018 . 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 19. The loans are primarily sold to FNMA, FHLMC, and GNMA. At December 31, 2019 , the fair value of these loans was $9.2 million , and the unpaid principal balance was $8.9 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 totaled $4.6 million at December 31, 2019 . At December 31, 2019 , 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 $365 thousand and $1.4 million at December 31, 2019 and 2018 , respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles (RV), totaled $5.5 million and $2.0 million at December 31, 2019 and 2018 , respectively. The December 31, 2019 balance of repossessed assets also included trailers with an asset value of $3.4 million, which were acquired due to the bankruptcy of a single leasing customer. 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

Investment Securities	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities, at fair value, consisted of the following at December 31, 2019 and 2018 : 2019 2018 Available for sale debt securities $ 8,571,626 $ 8,538,041 Trading debt securities 28,161 27,059 Equity securities: Readily determinable fair value 2,929 2,585 No readily determinable fair value 1,280 1,824 Other: Federal Reserve Bank stock 33,770 33,498 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 94,122 85,659 Total investment securities $ 8,741,888 $ 8,698,666 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 year-ended December 31, 2019 , the Company did not record any impairment or other adjustments to the carrying amount of its portfolio of equity securities with no 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 December 31, 2019 is shown in the following table. The weighted average yield for each range of maturities was calculated using the yield on each security within that range weighted by the amortized cost of each security at December 31, 2019 . Yields on tax exempt securities have not been adjusted for tax exempt status. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by residential and commercial 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. (Dollars in thousands) Amortized Cost Fair Value Weighted Average Yield U.S. government and federal agency obligations: Within 1 year $ 57,234 $ 57,192 (.01 )*% After 1 but within 5 years 518,035 533,805 2.17 * After 5 but within 10 years 252,592 260,779 .59 * Total U.S. government and federal agency obligations 827,861 851,776 1.54 * Government-sponsored enterprise obligations: Within 1 year 81,616 81,830 1.99 After 10 years 57,118 57,447 2.65 Total government-sponsored enterprise obligations 138,734 139,277 2.26 State and municipal obligations: Within 1 year 51,230 51,540 2.55 After 1 but within 5 years 740,283 763,396 2.42 After 5 but within 10 years 377,009 395,014 2.56 After 10 years 57,010 57,977 2.92 Total state and municipal obligations 1,225,532 1,267,927 2.49 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,893,247 3,937,964 2.87 Non-agency mortgage-backed securities 796,451 809,782 2.98 Asset-backed securities 1,228,151 1,233,489 2.61 Total mortgage and asset-backed securities 5,917,849 5,981,235 2.83 Other debt securities: Within 1 year 51,998 52,180 After 1 but within 5 years 218,950 222,770 After 5 but within 10 years 54,607 56,461 Total other debt securities 325,555 331,411 Total available for sale debt securities $ 8,435,531 $ 8,571,626 * Rate does not reflect inflation adjustment on inflation-protected securities Investments in U.S. government and federal agency obligations include U.S. Treasury inflation-protected securities, which totaled $461.8 million , at fair value, at December 31, 2019 . Interest paid on these securities increases with inflation and decreases with deflation, as measured by the Consumer Price Index. At maturity, the principal paid is the greater of an inflation-adjusted principal or the original principal. Included in state and municipal obligations are $9.9 million , at fair value, of auction rate securities, which were purchased from bank customers in 2008. Interest on these bonds is currently being paid at the maximum failed auction rates. For debt securities classified as available for sale, the following table shows the 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 December 31, 2018 U.S. government and federal agency obligations $ 914,486 $ 4,545 $ (11,379 ) $ 907,652 Government-sponsored enterprise obligations 199,470 55 (3,747 ) 195,778 State and municipal obligations 1,322,785 10,284 (5,030 ) 1,328,039 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,253,433 9,820 (48,268 ) 3,214,985 Non-agency mortgage-backed securities 1,053,854 6,641 (12,779 ) 1,047,716 Asset-backed securities 1,518,976 3,849 (11,211 ) 1,511,614 Total mortgage and asset-backed securities 5,826,263 20,310 (72,258 ) 5,774,315 Other debt securities 339,595 72 (7,410 ) 332,257 Total $ 8,602,599 $ 35,266 $ (99,824 ) $ 8,538,041 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 for an extended period of time, or those which 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, expected 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 (including current delinquencies). 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 December 31, 2019 , the fair value of securities on this watch list was $51.6 million compared to $57.7 million at December 31, 2018 . As of December 31, 2019 , the Company had recorded other-than-temporary impairment (OTTI) on certain non-agency mortgage-backed securities with a current par value of $17.5 million . These securities, which are part of the watch list mentioned above, had an aggregate fair value of $13.1 million at December 31, 2019 . The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $13.3 million . The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost. The credit-related portion of the loss on these securities was based on the 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. Significant inputs to the cash flow models used to calculate the credit losses on these securities at December 31, 2019 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 9% - 52% Credit support 0% - 20% Loss severity 8% - 63% The following table presents a rollforward of the cumulative OTTI credit losses recognized in earnings on all available for sale debt securities. (In thousands) 2019 2018 2017 Cumulative OTTI credit losses at January 1 $ 14,092 $ 14,199 $ 14,080 Credit losses on debt securities for which impairment was not previously recognized 48 58 111 Credit losses on debt securities for which impairment was previously recognized 85 10 274 Increase in expected cash flows that are recognized over remaining life of security (950 ) (175 ) (266 ) Cumulative OTTI credit losses at December 31 $ 13,275 $ 14,092 $ 14,199 Debt securities with unrealized losses recorded in AOCI are shown in the table below, along with the length of the 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 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 December 31, 2018 U.S. government and federal agency obligations $ 317,699 $ 6,515 $ 116,728 $ 4,864 $ 434,427 $ 11,379 Government-sponsored enterprise obligations — — 188,846 3,747 188,846 3,747 State and municipal obligations 157,838 704 257,051 4,326 414,889 5,030 Mortgage and asset-backed securities: Agency mortgage-backed securities 330,933 1,502 1,927,268 46,766 2,258,201 48,268 Non-agency mortgage-backed securities 207,506 1,085 657,685 11,694 865,191 12,779 Asset-backed securities 147,997 728 813,427 10,483 961,424 11,211 Total mortgage and asset-backed securities 686,436 3,315 3,398,380 68,943 4,084,816 72,258 Other debt securities 51,836 564 260,682 6,846 312,518 7,410 Total $ 1,213,809 $ 11,098 $ 4,221,687 $ 88,726 $ 5,435,496 $ 99,824 The available for sale debt portfolio included $1.7 billion of securities that were in a loss position at December 31, 2019 , compared to $5.4 billion at December 31, 2018 . The total amount of unrealized loss on these securities was $12.9 million at December 31, 2019 , a decrease of $87.0 million compared to the unrealized loss at December 31, 2018 . This decrease in losses was mainly due to a declining interest rate environment. The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Year Ended December 31 (In thousands) 2019 2018 2017 Proceeds from sales of securities: Available for sale debt securities $ 402,103 $ 667,227 $ 779,793 Equity securities 3,856 41,637 10,953 Other 7,244 — 1,634 Total proceeds $ 413,203 $ 708,864 $ 792,380 Investment securities gains (losses), net: Available for sale debt securities: Losses realized on called bonds $ — $ — $ (254 ) Gains realized on sales 2,354 448 592 Losses realized on sales (2,568 ) (10,101 ) (10,287 ) Other-than-temporary impairment recognized on debt securities (133 ) (68 ) (385 ) Equity securities: Gains realized on donations of securities — — 31,074 Gains realized on sales 3,262 1,759 10,653 Losses realized on sales — (8,917 ) (10 ) Fair value adjustments, net 344 2,542 — Other: Gains realized on sales 1,094 — 381 Losses realized on sales — — (880 ) Fair value adjustments, net (727 ) 13,849 (5,833 ) Total investment securities gains (losses), net $ 3,626 $ (488 ) $ 25,051 Investment securities with a fair value of $4.3 billion were pledged at both December 31, 2019 and 2018 to secure public deposits, securities sold under repurchase agreements, trust funds, and borrowings at the Federal Reserve Bank. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $204.9 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 exceeds 10% of stockholders’ equity.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Premises and Equipment	and Equipment Premises and equipment consist of the following at December 31, 2019 and 2018 : (In thousands) 2019 2018 Land $ 91,678 $ 91,603 Buildings and improvements 566,177 545,510 Equipment 237,047 226,666 Right of use leased assets 28,195 — Total 923,097 863,779 Less accumulated depreciation 552,460 530,660 Net premises and equipment $ 370,637 $ 333,119 Depreciation expense of $30.8 million in 2019 , $28.6 million in 2018 and $29.1 million in 2017 , was included in occupancy expense and equipment expense in the consolidated statements of income. Repairs and maintenance expense of $17.0 million , $16.9 million and $16.4 million for 2019 , 2018 and 2017 , respectively, was included in occupancy expense and equipment expense. There has been no interest expense capitalized on construction projects in the past three years. Right of use leased assets are comprised mainly of operating leases for branches, office space, ATM locations, and certain equipment, as described in Note 6.

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2019
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. December 31, 2019 December 31, 2018 ( 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 $ (29,485 ) $ — $ 1,785 $ 31,270 $ (28,954 ) $ — $ 2,316 Mortgage servicing rights 12,942 (4,866 ) (327 ) 7,749 10,339 (3,861 ) — 6,478 Total $ 44,212 $ (34,351 ) $ (327 ) $ 9,534 $ 41,609 $ (32,815 ) $ — $ 8,794 The carrying amount of goodwill and its allocation among segments at December 31, 2019 and 2018 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2019 , 2018 or 2017 . Further, the annual assessment of qualitative factors on January 1, 2020 revealed no likelihood of impairment as of that date. (In thousands) December 31, 2019 December 31, 2018 Consumer segment $ 70,721 $ 70,721 Commercial segment 67,454 67,454 Wealth segment 746 746 Total goodwill $ 138,921 $ 138,921 Changes in the net carrying amount of goodwill and other net intangible assets for the years ended December 31, 2019 and 2018 are shown in the following table. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance at December 31, 2017 $ 138,921 $ 2,965 $ 4,653 Originations — — 2,433 Amortization — (649 ) (617 ) Impairment reversal — — 9 Balance at December 31, 2018 138,921 2,316 6,478 Originations — — 2,603 Amortization — (531 ) (1,005 ) Impairment — — (327 ) Balance at December 31, 2019 $ 138,921 $ 1,785 $ 7,749 Mortgage servicing rights (MSRs) are initially recorded at fair value and subsequently amortized over the period of estimated servicing income. They are periodically reviewed for impairment at a tranche level, and if impairment is indicated, recorded at fair value. Temporary impairment, including impairment recovery, is effected through a change in a valuation allowance. At December 31, 2019 , temporary impairment of $327 thousand had been recognized. The fair value of the MSRs is based on the present value of expected future cash flows, as further discussed in Note 17 on Fair Value Measurements. Aggregate amortization expense on intangible assets for the years ended December 31, 2019 , 2018 and 2017 was $1.5 million , $1.3 million and $1.3 million , respectively. The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of December 31, 2019 . 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 $ 1,507 2021 1,286 2022 1,099 2023 919 2024 770

Leases (Notes)

Leases (Notes)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases [Text Block]	Leases The Company adopted ASU 2016-02, "Leases", and its related amendments on January 1, 2019 using a modified retrospective approach. The Company's leasing activities include leasing certain real estate and equipment, providing lease financing to commercial customers, and leasing office space to third parties. The Company adopted the package of practical expedients permitted within the new standard, along with the lease component expedient for all lease classes and the disclosure expedient. The Company uses the FHLB fixed-advance rate at lease commencement or at any subsequent remeasurement event date based on the remaining lease term to calculate the liability for each lease. Lessee The Company primarily has operating leases for branches, office space, ATM locations, and certain equipment. As of December 31, 2019 , the right-of-use asset for operating leases, reported within premises and equipment, net, and lease liability, reported within other liabilities, recognized on the Company's consolidated balance sheets totaled $26.3 million and $27.0 million , respectively. Total lease cost for the year ended December 31, 2019 was $7.3 million . For leases with a term of 12 months or less, an election was made not to recognize lease assets and lease liabilities for all asset classes, and to recognize lease expense for these leases on a straight-line basis over the lease term. The Company's leases have remaining terms of 1 month to 34 years, most of which contain renewal options. However, the renewal options are generally not included in the leased asset or liability because the option exercises are uncertain. The maturities of operating leases are included in the table below. (in thousands) Operating Leases (1) 2020 $ 5,913 2021 5,001 2022 4,304 2023 3,802 2024 2,530 After 2024 12,600 Total lease payments $ 34,150 Less: Interest (2) 7,126 Present value of lease liabilities $ 27,024 (1) Excludes $6.5 million of legally binding minimum lease payments for operating leases signed but not yet commenced. (2) Calculated using the interest rate for each lease. The following table presents the average lease term and discount rate of operating leases. December 31, 2019 Weighted-average remaining lease term 11.7 years Weighted-average discount rate 3.67 % Supplemental cash flow information related to operating leases is included in the table below. For the Year Ended December 31 (in thousands) 2019 Operating cash paid toward lease liabilities $ 5,989 Leased assets obtained in exchange for new lease liabilities $ 3,958 The Company adopted the new lease standard using the effective date as the date of initial application as noted above, and as required, the table below provides the disclosure for periods prior to adoption. Under ASC Topic 840, Leases , rent expense amounted to $7.7 million and $7.3 million in 2018 and 2017 , respectively. Future minimum lease payments as of December 31, 2018 are shown below, which include leases that have not yet commenced. (in thousands) Year Ended December 31 Total 2019 $ 5,763 2020 4,817 2021 4,055 2022 3,598 2023 3,273 After 15,161 Total minimum lease payments $ 36,667 Lessor 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 for the lessee to renew or 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 to expand the leased space, and currently the leases have remaining terms of 1 month to 8 years. The following table provides the components of lease income. For the Year Ended December 31 (in thousands) 2019 Direct financing and sales-type leases 24,062 Operating leases (1) 7,951 Total lease income $ 32,013 (1) Includes rent of $75 thousand from Tower Properties Company, a related party. The following table presents the components of the net investments in direct financing and sales-type leases. (in thousands) December 31, 2019 Lease payment receivable $ 738,809 Unguaranteed residual assets 53,408 Total net investments in direct financing and sales-type leases $ 792,217 Deferred origination cost 3,609 Total net investment included within business loans $ 795,826 The maturities of lease receivables are included in the table below. (in thousands) Direct Financing and Sale-Type Leases Operating Leases Total 2020 $ 224,297 $ 7,564 $ 231,861 2021 177,143 7,511 184,654 2022 136,787 13,816 150,603 2023 92,813 5,536 98,349 2024 58,773 4,811 63,584 After 2024 114,188 8,643 122,831 Total lease receipts 804,001 $ 47,881 $ 851,882 Less: Net present value adjustment 65,192 Present value of lease receipts $ 738,809

Deposits

Deposits	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Deposits	Deposits At December 31, 2019 , the scheduled maturities of certificates of deposit were as follows: (In thousands) Due in 2020 $ 1,727,042 Due in 2021 229,487 Due in 2022 27,205 Due in 2023 14,387 Due in 2024 9,838 Thereafter 53 Total $ 2,008,012 The following table shows a detailed breakdown of the maturities of certificates of deposit, by size category, at December 31, 2019 . (In thousands) Certificates of Deposit under $100,000 Certificates of Deposit over $100,000 Total Due in 3 months or less $ 117,635 $ 632,064 $ 749,699 Due in over 3 through 6 months 144,309 286,240 430,549 Due in over 6 through 12 months 223,756 323,038 546,794 Due in over 12 months 140,457 140,513 280,970 Total $ 626,157 $ 1,381,855 $ 2,008,012 The aggregate amount of certificates of deposit that exceeded the $250,000 FDIC insurance limit totaled $1.1 billion at December 31, 2019

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Borrowings	Borrowings At December 31, 2019 , the Company's borrowings primarily consisted of federal funds purchased and securities sold under agreements to repurchase (repurchase agreements). The following table sets forth selected information for federal funds purchased and repurchase agreements. (Dollars in thousands) Year End Weighted Rate Average Weighted Rate Average Balance Outstanding Maximum Outstanding at any Month End Balance at December 31 Federal funds purchased and repurchase agreements: 2019 .8 % 1.6 % $ 1,822,098 $ 2,394,294 $ 1,850,772 2018 .9 1.3 1,514,144 1,981,761 1,956,389 2017 .8 .7 1,462,387 1,984,071 1,507,138 Federal funds purchased and repurchase agreements comprised the majority of the Company's short-term borrowings (borrowings with an original maturity of less than one year) at December 31, 2019 , and $1.8 billion of these borrowings were repurchase agreements, which generally have one day maturities and are mainly comprised of non-insured customer funds secured by a portion of the Company's investment portfolio. Additional information about the securities pledged for repurchase agreements is provided in Note 20 on Resale and Repurchase Agreements. The Bank is a member of the Des Moines FHLB and has access to term financing from the FHLB. These borrowings are secured under a blanket collateral agreement including primarily residential mortgages as well as all unencumbered assets and stock of the borrowing bank. At December 31, 2019 , the Bank had no outstanding advances from the FHLB. The FHLB also issues letters of credit to secure the Bank's obligations to certain depositors of public funds, which totaled $396.6 million at December 31, 2019

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income tax expense from operations for the years ended December 31, 2019 , 2018 and 2017 were as follows: (In thousands) Current Deferred Total Year ended December 31, 2019: U.S. federal $ 82,556 $ 11,388 $ 93,944 State and local 12,323 2,807 15,130 Total $ 94,879 $ 14,195 $ 109,074 Year ended December 31, 2018: U.S. federal $ 90,390 $ 3,220 $ 93,610 State and local 10,223 2,116 12,339 Total $ 100,613 $ 5,336 $ 105,949 Year ended December 31, 2017: U.S. federal $ 89,154 $ 12,190 $ 101,344 State and local 7,735 1,427 9,162 Total $ 96,889 $ 13,617 $ 110,506 The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2019 , 2018 and 2017 were as follows: (In thousands) 2019 2018 2017 Unrealized gain (loss) on available for sale debt securities $ 50,163 $ (18,634 ) $ 2,104 Change in fair value on cash flow hedges 7,818 2,286 — Accumulated pension (benefit) loss 389 222 (184 ) Income tax (benefit) expense allocated to stockholders’ equity $ 58,370 $ (16,126 ) $ 1,920 Significant components of the Company’s deferred tax assets and liabilities at December 31, 2019 and 2018 were as follows: (In thousands) 2019 2018 Deferred tax assets: Loans, principally due to allowance for loan losses $ 39,130 $ 39,169 Unrealized loss on available for sale debt securities — 16,140 Equity-based compensation 7,554 7,609 Deferred compensation 6,662 5,911 Unearned fee income 5,053 4,125 Accrued expenses 4,270 2,152 Other 4,057 4,640 Total deferred tax assets 66,726 79,746 Deferred tax liabilities: Equipment lease financing 68,814 55,738 Unrealized gain on available for sale debt securities 34,024 — Land, buildings and equipment 17,202 14,207 Cash flow hedges 9,015 2,104 Intangibles 6,491 5,973 Other 7,331 5,309 Total deferred tax liabilities 142,877 83,331 Net deferred tax liabilities $ (76,151 ) $ (3,585 ) Management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the total deferred tax assets. A reconciliation between the expected federal income tax expense using the federal statutory tax rate and the Company's actual income tax expense is provided below. The federal statutory tax rate was 21% in 2019 and 2018, and 35% in 2017. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense. (In thousands) 2019 2018 2017 Computed “expected” tax expense $ 111,364 $ 113,293 $ 150,461 Increase (decrease) in income taxes resulting from: Tax-exempt interest, net of cost to carry (10,973 ) (11,502 ) (20,295 ) Contribution of appreciated securities — — (10,864 ) State and local income taxes, net of federal tax benefit 11,953 9,748 5,955 Tax reform enactment — — (6,753 ) Share-based award payments (3,337 ) (3,928 ) (6,613 ) Other 67 (1,662 ) (1,385 ) Total income tax expense $ 109,074 $ 105,949 $ 110,506 The gross amount of unrecognized tax benefits was $1.4 million and $1.3 million at December 31, 2019 and 2018 , respectively, and the total amount of unrecognized tax benefits that would impact the effective tax rate, if recognized, was $1.1 million and $993 thousand , respectively. The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2019 and 2018 was as follows: (In thousands) 2019 2018 Unrecognized tax benefits at beginning of year $ 1,257 $ 1,208 Gross increases – tax positions in prior period 18 31 Gross decreases – tax positions in prior period (4 ) — Gross increases – current-period tax positions 361 322 Lapse of statute of limitations (260 ) (304 ) Unrecognized tax benefits at end of year $ 1,372 $ 1,257 The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2016 through 2019 remain open to examination for U.S. federal income tax and for major state taxing jurisdictions.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Defined Benefit Plan [Abstract]
Employee Benefit Plans	Employee Benefit Plans Employee benefits charged to operating expenses are summarized in the table below. Substantially all of the Company’s employees are covered by a defined contribution (401(k)) plan, under which the Company makes matching contributions. (In thousands) 2019 2018 2017 Payroll taxes $ 26,959 $ 25,712 $ 24,402 Medical plans 29,635 27,030 25,143 401(k) plan 15,810 14,986 14,244 Pension plans 605 651 704 Other 3,049 2,918 2,883 Total employee benefits $ 76,058 $ 71,297 $ 67,376 A portion of the Company’s employees are covered by a noncontributory defined benefit pension plan, however, participation in the pension plan is not available to employees hired after June 30, 2003. All participants are fully vested in their benefit payable upon normal retirement date, which is based on years of participation and compensation. Since January 2011, all benefits accrued under the pension plan have been frozen. However, the accounts continue to accrue interest at a stated annual rate. Certain key executives also participate in a supplemental executive retirement plan (the CERP) that the Company funds only as retirement benefits are disbursed. The CERP carries no segregated assets. The CERP continues to provide credits based on hypothetical contributions in excess of those permitted under the 401(k) plan. In the tables presented below, the pension plan and the CERP are presented on a combined basis. Under the Company’s funding policy for the defined benefit pension plan, contributions are made to a trust as necessary to satisfy the statutory minimum required contribution as defined by the Pension Protection Act, which is intended to provide for current service accruals and for any unfunded accrued actuarial liabilities over a reasonable period. To the extent that these requirements are fully covered by assets in the trust, a contribution might not be made in a particular year. No contributions to the defined benefit plan were made in 2019 or 2018. The Company made a discretionary contribution of $5.5 million to its defined benefit pension plan in 2017 in order to reduce pension guarantee premiums. The minimum required contribution for 2020 is expected to be zero . The Company does not expect to make any further contributions in 2020 other than the necessary funding contributions to the CERP. Contributions to the CERP were $25 thousand , $24 thousand and $439 thousand during 2019 , 2018 and 2017 , respectively. The following items are components of the net pension cost for the years ended December 31, 2019 , 2018 and 2017 . (In thousands) 2019 2018 2017 Service cost-benefits earned during the year $ 607 $ 651 $ 621 Interest cost on projected benefit obligation 4,198 3,756 3,826 Expected return on plan assets (4,842 ) (5,255 ) (5,785 ) Amortization of prior service cost (271 ) (271 ) (271 ) Amortization of unrecognized net loss 2,288 2,267 2,313 Net periodic pension cost $ 1,980 $ 1,148 $ 704 The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2019 and 2018 . (In thousands ) 2019 2018 Change in projected benefit obligation Projected benefit obligation at prior valuation date $ 112,063 $ 120,667 Service cost 607 651 Interest cost 4,198 3,756 Benefits paid (7,016 ) (6,622 ) Actuarial (gain) loss 10,750 (6,389 ) Projected benefit obligation at valuation date 120,602 112,063 Change in plan assets Fair value of plan assets at prior valuation date 99,418 108,260 Actual return on plan assets 15,129 (2,244 ) Employer contributions 25 24 Benefits paid (7,016 ) (6,622 ) Fair value of plan assets at valuation date 107,556 99,418 Funded status and net amount recognized at valuation date $ (13,046 ) $ (12,645 ) The accumulated benefit obligation, which represents the liability of a plan using only benefits as of the measurement date, was $120.6 million and $112.1 million for the combined plans on December 31, 2019 and 2018 , respectively. Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2019 and 2018 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis. (In thousands) 2019 2018 Prior service cost $ 1,265 $ 1,535 Accumulated loss (30,516 ) (32,342 ) Accumulated other comprehensive loss (29,251 ) (30,807 ) Cumulative employer contributions in excess of net periodic benefit cost 16,205 18,162 Net amount recognized as an accrued benefit liability on the December 31 balance sheet $ (13,046 ) $ (12,645 ) Net loss arising during period (461 ) (1,110 ) Amortization of net loss 2,288 2,267 Amortization of prior service cost (271 ) (271 ) Total recognized in other comprehensive income $ 1,556 $ 886 Total expense recognized in net periodic pension cost and other comprehensive income $ (424 ) $ (262 ) The estimated net loss and prior service cost to be amortized from accumulated other comprehensive income into net periodic pension cost in 2020 is $1.9 million . The following assumptions, on a weighted average basis, were used in accounting for the plans. 2019 2018 2017 Determination of benefit obligation at year end: Effective discount rate for benefit obligations 3.07 % 4.14 % 3.57 % Assumed credit on cash balance accounts 5.00 % 5.00 % 5.00 % Determination of net periodic benefit cost for year ended: Effective discount rate for benefit obligations 4.13 % 3.57 % 3.95 % Effective rate for interest on benefit obligations 3.81 % 3.28 % 3.28 % Long-term rate of return on assets 5.00 % 5.00 % 6.00 % Assumed credit on cash balance accounts 5.00 % 5.00 % 5.00 % The following table shows the fair values of the Company’s pension plan assets by asset category at December 31, 2019 and 2018 . Information about the valuation techniques and inputs used to measure fair value are provided in Note 17 on Fair Value Measurements. Fair Value Measurements (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) December 31, 2019 Assets: U.S. government obligations $ 4,746 $ 4,746 $ — $ — Government-sponsored enterprise obligations (a) 1,302 — 1,302 — State and municipal obligations 8,612 — 8,612 — Agency mortgage-backed securities (b) 8,892 — 8,892 — Non-agency mortgage-backed securities 3,919 — 3,919 — Asset-backed securities 5,093 — 5,093 — Corporate bonds (c) 39,663 — 39,663 — Equity securities and mutual funds: (d) Mutual funds 6,315 6,315 — — Common stocks 22,552 22,552 — — International developed markets funds 4,674 4,674 — — Emerging markets funds 1,788 1,788 — — Total $ 107,556 $ 40,075 $ 67,481 $ — December 31, 2018 Assets: U.S. government obligations $ 2,994 $ 2,994 $ — $ — Government-sponsored enterprise obligations (a) 1,200 — 1,200 — State and municipal obligations 8,299 — 8,299 — Agency mortgage-backed securities (b) 8,209 — 8,209 — Non-agency mortgage-backed securities 4,398 — 4,398 — Asset-backed securities 3,520 — 3,520 — Corporate bonds (c) 37,207 — 37,207 — Equity securities and mutual funds: (d) Mutual funds 8,645 8,645 — — Common stocks 18,173 18,173 — — International developed markets funds 5,046 5,046 — — Emerging markets funds 1,727 1,727 — — Total $ 99,418 $ 36,585 $ 62,833 $ — (a) This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association. (b) This category represents mortgage-backed securities issued by the agencies mentioned in (a). (c) This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries. (d) This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the financial services, technology services, healthcare, electronic technology, and producer manufacturing industries. The investment policy of the pension plan is designed for growth in principal, within limits designed to safeguard against significant losses within the portfolio. The policy sets guidelines, which may change from time to time, regarding the types and percentages of investments held. Currently, the policy includes guidelines such as holding bonds rated investment grade or better and prohibiting investment in Company stock. The plan does not utilize derivatives. Management believes there are no significant concentrations of risk within the plan asset portfolio at December 31, 2019 . Under the current policy, the long-term investment target mix for the plan is 35% equity securities and 65% fixed income securities. The Company regularly reviews its policies on investment mix and may make changes depending on economic conditions and perceived investment risk. The assumed overall expected long-term rate of return on pension plan assets used in calculating 2019 pension plan expense was 5.0% . Determination of the plan’s expected rate of return is based upon historical and anticipated returns of the asset classes invested in by the pension plan and the allocation strategy currently in place among those classes. The rate used in plan calculations may be adjusted by management for current trends in the economic environment. The 10-year annualized return for the Company’s pension plan was 7.3% . During 2019 , the plan’s assets gained 14.8% of their value, compared to a loss of 1.7% in 2018 . Returns for any plan year may be affected by changes in the stock market and interest rates. The Company expects to incur pension expense of $402 thousand in 2020 , compared to $2.0 million in 2019 . The Company utilizes mortality tables published by the Society of Actuaries to incorporate mortality assumptions into the measurement of the pension benefit obligation. At December 31, 2019, the Company utilized an updated mortality table and projection scale, which decreased the pension benefit obligation on that date by approximately $1.1 million . The following future benefit payments are expected to be paid: (In thousands) 2020 $ 7,281 2021 7,430 2022 7,409 2023 7,467 2024 7,371 2025 - 2029 35,721

Stock-Based Compensation and Di

Stock-Based Compensation and Directors Stock Purchase Plan	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Stock-Based Compensation	Stock-Based Compensation and Directors Stock Purchase Plan* The Company’s stock-based compensation is provided under a stockholder-approved plan that allows for issuance of various types of awards, including stock options, stock appreciation rights, restricted stock and restricted stock units, performance awards and stock-based awards. During the past three years, stock-based compensation has been issued in the form of nonvested stock awards and stock appreciation rights. At December 31, 2019 , 2,249,326 shares remained available for issuance under the plan. The stock-based compensation expense that was charged against income was $13.9 million , $12.8 million and $12.1 million for the years ended December 31, 2019 , 2018 and 2017 , respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements was $3.0 million , $3.2 million and $4.5 million for the years ended December 31, 2019 , 2018 and 2017 , respectively. Nonvested Restricted Stock Awards Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are 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 of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2019 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2019 1,239,970 $ 41.18 Granted 217,182 58.82 Vested (339,618 ) 31.33 Forfeited (13,323 ) 47.41 Nonvested at December 31, 2019 1,104,211 $ 47.57 The total fair value (at vest date) of shares vested during 2019 , 2018 and 2017 was $19.9 million , $21.5 million and $23.8 million , respectively. Stock Appreciation Rights Stock appreciation rights (SARs) are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs generally vest ratably over 4 years of continuous service and have 10 -year contractual terms. All SARs must be settled in stock under provisions of the plan. A summary of SAR activity during 2019 is presented below. ( Dollars in thousands, except per share data) Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2019 1,119,405 $ 38.30 Granted 196,129 58.82 Forfeited (5,935 ) 49.67 Expired (1,917 ) 37.00 Exercised (257,866 ) 32.30 Outstanding at December 31, 2019 1,049,816 $ 43.55 6.6 years $ 25,601 Exercisable at December 31, 2019 557,763 $ 36.16 5.3 years $ 17,728 In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs on date of grant. The Black-Scholes model is a closed-end model that uses various assumptions as shown in the following table. Expected volatility is based on historical volatility of the Company’s stock. The Company uses historical exercise behavior and other factors to estimate the expected term of the SARs, which represents the period of time that the SARs granted are expected to be outstanding. The risk-free rate for the expected term is based on the U.S. Treasury zero coupon spot rates in effect at the time of grant. The per share average fair value and the model assumptions for SARs granted during the past three years are shown in the table below. 2019 2018 2017 Weighted per share average fair value at grant date $11.35 $11.28 $10.83 Assumptions: Dividend yield 1.7 % 1.6 % 1.6 % Volatility 19.8 % 20.6 % 21.1 % Risk-free interest rate 2.6 % 2.7 % 2.4 % Expected term 6.0 years 6.6 years 7.0 years Additional information about stock options and SARs exercised is presented below. (In thousands) 2019 2018 2017 Intrinsic value of options and SARs exercised $ 7,109 $ 9,632 $ 9,310 Tax benefit realized from options and SARs exercised $ 1,385 $ 1,928 $ 2,698 As of December 31, 2019 , there was $27.7 million of unrecognized compensation cost related to unvested SARs and stock awards. This cost is expected to be recognized over a weighted average period of approximately 3.0 years. Directors Stock Purchase Plan The Company has a directors stock purchase plan whereby outside directors of the Company and its subsidiaries may elect to use their directors’ fees to purchase Company stock at market value each month end. Remaining shares available for issuance under this plan were 33,914 at December 31, 2019 . In 2019 , 21,904 shares were purchased at an average price of $61.14 , and in 2018 , 32,454 shares were purchased at an average price of $54.92 . * All share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2019 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The table below shows the activity and accumulated balances for components of other comprehensive income (loss). The largest component is the unrealized holding gains and losses on available for sale debt securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. 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 in fair value on certain interest rate floors that have been designated as cash flow hedging instruments. Unrealized Gains (Losses) on Securities (1) Pension Loss Unrealized Gains on Cash Flow Hedge Derivatives (2) Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 2019 $ 3,861 $ (52,278 ) $ (23,107 ) $ 6,855 $ (64,669 ) Other comprehensive income (loss) before reclassifications (975 ) 201,280 (461 ) 27,481 227,325 Amounts reclassified from accumulated other comprehensive income 133 215 2,017 3,793 6,158 Current period other comprehensive income (loss), before tax (842 ) 201,495 1,556 31,274 233,483 Income tax (expense) benefit 210 (50,373 ) (389 ) (7,818 ) (58,370 ) Current period other comprehensive income (loss), net of tax (632 ) 151,122 1,167 23,456 175,113 Transfer of unrealized gain on securities for which impairment was not previously recognized 35 (35 ) — — — Balance December 31, 2019 $ 3,264 $ 98,809 $ (21,940 ) $ 30,311 $ 110,444 Balance January 1, 2018 $ 3,411 $ 30,326 $ (19,629 ) $ — $ 14,108 ASU 2018-02 Reclassification of tax rate change 715 6,359 (4,142 ) — 2,932 ASU 2016-01 Reclassification of unrealized gain on equity securities — (33,320 ) — — (33,320 ) Other comprehensive income (loss) before reclassifications (438 ) (73,725 ) (1,110 ) 8,381 (66,892 ) Amounts reclassified from accumulated other comprehensive income 68 (447 ) 1,996 760 2,377 Current period other comprehensive income (loss), before tax (370 ) (74,172 ) 886 9,141 (64,515 ) Income tax (expense) benefit 93 18,541 (222 ) (2,286 ) 16,126 Current period other comprehensive income (loss), net of tax (277 ) (55,631 ) 664 6,855 (48,389 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 12 (12 ) — — — Balance December 31, 2018 $ 3,861 $ (52,278 ) $ (23,107 ) $ 6,855 $ (64,669 ) (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. The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income", which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (loss) (as shown in the table above) to retained earnings. New accounting guidance, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income (loss) to retained earnings (also shown above).

Segments

Segments	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segments	Segments The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial, and Wealth. The Consumer segment includes the consumer portion of the retail branch network (loans, deposits and other personal banking services), indirect and other consumer financing, and consumer 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. The Commercial segment provides corporate lending (including the Small Business Banking product line within the branch network), leasing, international services, and business, government deposit, and related commercial cash management services, as well as merchant and commercial bank card products. The Commercial segment also includes the Capital Markets Group, which sells fixed income securities and provides securities safekeeping and bond accounting services. 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 Company’s business line reporting system derives segment information 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. These 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 for (provided by) assets and liabilities based on their maturity, prepayment and/or repricing characteristics. Income and expense that directly relate to segment operations are recorded in the segment when incurred. Expenses that indirectly support the segments are allocated based on the most appropriate method available. The Company uses a funds transfer pricing method to value funds used (e.g., loans, fixed assets, and cash) and funds provided (e.g., deposits, borrowings, and equity) by the business segments and their components. This process assigns a specific value to each new source or use of funds with a maturity, based on current swap rates, thus determining an interest spread at the time of the transaction. Non-maturity assets and liabilities are valued using weighted average pools. The funds transfer pricing process attempts to remove interest rate risk from valuation, allowing management to compare profitability under various rate environments. The following tables present selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues between 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. Segment Income Statement Data (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Year ended December 31, 2019: Net interest income $ 315,782 $ 342,736 $ 48,058 $ 706,576 $ 114,717 $ 821,293 Provision for loan losses (44,987 ) (4,204 ) (174 ) (49,365 ) (1,073 ) (50,438 ) Non-interest income 135,257 203,952 183,589 522,798 1,905 524,703 Investment securities gains, net — — — — 3,626 3,626 Non-interest expense (297,581 ) (308,686 ) (124,123 ) (730,390 ) (37,008 ) (767,398 ) Income before income taxes $ 108,471 $ 233,798 $ 107,350 $ 449,619 $ 82,167 $ 531,786 Year ended December 31, 2018: Net interest income $ 294,798 $ 344,972 $ 46,946 $ 686,716 $ 137,109 $ 823,825 Provision for loan losses (40,571 ) (1,134 ) 32 (41,673 ) (1,021 ) (42,694 ) Non-interest income 126,253 202,527 173,026 501,806 (465 ) 501,341 Investment securities losses, net — — — — (488 ) (488 ) Non-interest expense (286,181 ) (297,847 ) (123,568 ) (707,596 ) (30,225 ) (737,821 ) Income before income taxes $ 94,299 $ 248,518 $ 96,436 $ 439,253 $ 104,910 $ 544,163 Year ended December 31, 2017: Net interest income $ 276,891 $ 329,087 $ 47,264 $ 653,242 $ 80,437 $ 733,679 Provision for loan losses (40,619 ) 205 (41 ) (40,455 ) (4,789 ) (45,244 ) Non-interest income 121,362 184,577 158,175 464,114 (2,851 ) 461,263 Investment securities gains, net — — — — 25,051 25,051 Non-interest expense (274,225 ) (281,845 ) (120,461 ) (676,531 ) (67,812 ) (744,343 ) Income before income taxes $ 83,409 $ 232,024 $ 84,937 $ 400,370 $ 30,036 $ 430,406 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 loan losses in this category contains the difference between net loan charge-offs assigned directly to the segments and the recorded provision for loan loss expense. Included in this category’s net interest income are earnings of the investment portfolio, which are not allocated to a segment. Segment Balance Sheet Data (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Average balances for 2019: Assets $ 2,375,326 $ 9,486,074 $ 1,288,806 $ 13,150,206 $ 12,063,319 $ 25,213,525 Loans, including held for sale 2,239,100 9,250,645 1,276,839 12,766,584 1,476,630 14,243,214 Goodwill and other intangible assets 79,055 68,109 746 147,910 — 147,910 Deposits 10,236,257 7,848,367 1,832,418 19,917,042 (7,151 ) 19,909,891 Average balances for 2018: Assets $ 2,481,060 $ 9,115,738 $ 1,243,806 $ 12,840,604 $ 11,825,631 $ 24,666,235 Loans, including held for sale 2,346,166 8,939,696 1,233,780 12,519,642 1,425,930 13,945,572 Goodwill and other intangible assets 78,062 68,300 746 147,108 — 147,108 Deposits 10,210,502 8,029,248 1,871,596 20,111,346 19,906 20,131,252 The above segment balances include only those items directly associated with the segment. The “Other/Elimination” column includes unallocated bank balances not associated with a segment (such as investment securities and federal funds sold), balances relating to certain other administrative and corporate functions, and eliminations between segment and non-segment balances. This column also includes the resulting effect of allocating such items as float, deposit reserve and capital for the purpose of computing the cost or credit for funds used/provided. The Company’s reportable segments are strategic lines of business that offer different products and services. They are managed separately because each line services a specific customer need, requiring different performance measurement analyses and marketing strategies. The performance measurement of the 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.

Common and Preferred Stock

Common and Preferred Stock	12 Months Ended
	Dec. 31, 2019
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common and Preferred Stock* On December 18, 2019, the Company distributed a 5% stock dividend on its $5 par common stock for the 26th consecutive year. All per common share data in this report has been restated to reflect the stock dividend. The Company applies the two-class method of computing income per share, as nonvested share-based awards that pay nonforfeitable common stock 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 following table. Nonvested share-based awards are further discussed in Note 11 on Stock-Based Compensation. Basic income per share is based on the weighted average number of common shares outstanding during the year. Diluted income per share gives effect to all dilutive potential common shares that were outstanding during the year. Presented below is a summary of the components used to calculate basic and diluted income per common share, which have been restated for all stock dividends. (In thousands, except per share data) 2019 2018 2017 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 421,231 $ 433,542 $ 319,383 Less preferred stock dividends 9,000 9,000 9,000 Net income available to common shareholders 412,231 424,542 310,383 Less income allocated to nonvested restricted stock 4,019 4,558 3,848 Net income allocated to common stock $ 408,212 $ 419,984 $ 306,535 Weighted average common shares outstanding 113,784 116,352 116,375 Basic income per common share $ 3.59 $ 3.61 $ 2.63 Diluted income per common share: Net income available to common shareholders $ 412,231 $ 424,542 $ 310,383 Less income allocated to nonvested restricted stock 4,012 4,547 3,838 Net income allocated to common stock $ 408,219 $ 419,995 $ 306,545 Weighted average common shares outstanding 113,784 116,352 116,375 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 282 361 410 Weighted average diluted common shares outstanding 114,066 116,713 116,785 Diluted income per common share $ 3.58 $ 3.60 $ 2.62 Unexercised stock appreciation rights of 356 thousand , 235 thousand and 167 thousand were excluded from the computation of diluted income per share for the years ended December 31, 2019 , 2018 and 2017 , respectively, because their inclusion would have been anti-dilutive. On August 7, 2019, the Company entered into an accelerated share repurchase ("ASR") agreement with Morgan Stanley & Co. LLC (Morgan Stanley). Under this ASR agreement, the Company paid $150.0 million to Morgan Stanley and received from Morgan Stanley 1,994,327 shares of the Company’s common stock, representing approximately 75% of the estimated total number of shares to be delivered by Morgan Stanley at the conclusion of the program. Final settlement occurred on December 30, 2019 at which time the remaining shares, totaling 438,009 , were received by the Company. The specific number of shares that the Company ultimately repurchased was based on the volume-weighted-average price per share of the Company’s common stock during the repurchase period. In the Annual Meeting of the Shareholders, held on April 17, 2019, a proposal to increase the shares of Company common stock authorized for issuance under its articles of incorporation was approved. The approval increased the authorized shares from 120,000,000 to 140,000,000 . The Company has 6,000,000 depositary shares outstanding, representing 6,000 shares of 6.00% Series B Non-Cumulative Perpetual Preferred Stock, par value $1.00 per share, having an aggregate liquidation preference of $150.0 million (“Series B Preferred Stock”). Each depositary share has a liquidation preference of $25 per share. Dividends on the Series B Preferred Stock, if declared, accrue and are payable quarterly, in arrears, at a rate of 6.00%. The Series B Preferred Stock qualifies as Tier 1 capital for the purposes of the regulatory capital calculations. In the event that the Company does not declare and pay dividends on the Series B Preferred Stock for the most recent dividend period, the ability of the Company to declare or pay dividends on, purchase, redeem or otherwise acquire shares of its common stock or any securities of the Company that rank junior to the Series B Preferred Stock is subject to certain restrictions under the terms of the Series B Preferred Stock. The Company maintains a treasury stock buyback program authorized by its Board of Directors. The most recent authorization in November 2019 approved future purchases of 5,000,000 shares of the Company's common stock. At December 31, 2019 , 4,430,958 shares of common stock remained available for purchase under the current authorization. The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends. Years Ended December 31 (In thousands) 2019 2018 2017 Shares outstanding at January 1 111,129 106,615 101,461 Issuance of stock: Awards and sales under employee and director plans 329 416 403 5% stock dividend 5,359 5,305 5,078 Other purchases of treasury stock (4,670 ) (1,194 ) (315 ) Other (15 ) (13 ) (12 ) Shares outstanding at December 31 112,132 111,129 106,615 * Except as noted in the above table, all share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2019 .

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Capital Requirements	Regulatory Capital Requirements The Company is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and additional discretionary actions by regulators that could have a direct material effect on the Company’s financial statements. The regulations require the Company to meet specific capital adequacy guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s capital classification is also subject to qualitative judgments by the regulators about components, risk weightings and other factors. The following tables show the capital amounts and ratios for the Company (on a consolidated basis) and the Bank, together with the minimum capital adequacy and well-capitalized capital requirements, at the last two year ends. Actual Minimum Capital Adequacy Requirement Well-Capitalized Capital Requirement (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 3,052,079 15.48 % $ 1,577,105 8.00 % N.A. N.A. Commerce Bank 2,583,676 13.19 1,566,866 8.00 $ 1,958,583 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,890,322 14.66 % $ 1,182,829 6.00 % N.A. N.A. Commerce Bank 2,421,919 12.37 1,175,150 6.00 $ 1,566,866 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,745,538 13.93 % $ 887,122 4.50 % N.A. N.A. Commerce Bank 2,421,919 12.37 881,362 4.50 $ 1,273,079 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,890,322 11.38 % $ 1,015,771 4.00 % N.A. N.A. Commerce Bank 2,421,919 9.57 1,012,232 4.00 $ 1,265,290 5.00 % December 31, 2018 Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 3,022,023 15.82 % $ 1,528,317 8.00 % N.A. N.A. Commerce Bank 2,655,591 13.98 1,519,169 8.00 $ 1,898,962 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,861,016 14.98 % $ 1,146,238 6.00 % N.A. N.A. Commerce Bank 2,494,584 13.14 1,139,377 6.00 $ 1,519,169 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,716,232 14.22 % $ 859,678 4.50 % N.A. N.A. Commerce Bank 2,494,584 13.14 854,533 4.50 $ 1,234,325 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,861,016 11.52 % $ 993,564 4.00 % N.A. N.A. Commerce Bank 2,494,584 10.07 991,185 4.00 $ 1,238,981 5.00 % The minimum required ratios for well-capitalized banks (under prompt corrective action provisions) are 6.5% for Tier I common capital, 8.0% for Tier I capital, 10.0% for Total capital and 5.0% for the leverage ratio. At December 31, 2019 and 2018 , the Company met all capital requirements to which it is subject, and the Bank’s capital position exceeded the regulatory definition of well-capitalized.

Revenue from Contracts with Cus

Revenue from Contracts with Customers Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company adopted ASU 2014-09, "Revenue from Contracts with Customers," and its related amendments on January 1, 2018. The core principle of the new guidance 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 year ended December 31, 2019 , approximately 61% 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 adoption of ASU 2014-09 did not require any significant change to the Company's revenue recognition processes. However, application of the new guidance resulted in a reclassification of certain bank card related network and rewards costs, previously classified as non-interest expense, to a reduction to non-interest income in the Company’s consolidated statements of income. The reclassification had no effect on prior period net income or net income per share. The Company adopted ASU 2014-09 on a full retrospective basis, in which each prior reporting period has been presented in accordance with the new guidance. The table below shows the effect of this reclassification on bank card fee income and non-interest expense for the year ended December 31, 2017. For the year ended December 31, 2017 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 180,441 $ (25,341 ) $ 155,100 Total non-interest income 486,604 (25,341 ) 461,263 Non-interest expense: Data processing and software $ 92,246 $ (11,248 ) $ 80,998 Other 77,459 (14,093 ) 63,366 Total non-interest expense 769,684 (25,341 ) 744,343 The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. For the Year Ended December 31 (In thousands) 2019 2018 2017 Bank card transaction fees $ 167,879 $ 171,576 $ 155,100 Trust fees 155,628 147,964 135,159 Deposit account charges and other fees 95,983 94,517 90,060 Consumer brokerage services 15,804 15,807 14,630 Other non-interest income 48,597 37,440 30,128 Total non-interest income from contracts with customers 483,891 467,304 425,077 Other non-interest income (1) 40,812 34,037 36,186 Total non-interest income $ 524,703 $ 501,341 $ 461,263 (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. The following table presents the opening and closing receivable balances for the years ended December 31, 2019 and 2018 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) December 31, 2019 December 31, 2018 December 31, 2017 Bank card transaction fees $ 13,915 $ 13,035 $ 13,315 Trust fees 2,093 2,721 2,802 Deposit account charges and other fees 6,523 6,107 5,597 Consumer brokerage services 596 559 380 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. A description of these revenue categories follows. Bank Card Transaction Fees The following table presents the components of bank card fee income. For the Years Ended December 31 (In thousands) 2019 2018 2017 Debit card: Fee income $ 42,106 $ 41,522 $ 40,134 Expense for network charges (2,081 ) (1,784 ) (4,498 ) Net debit card fees 40,025 39,738 35,636 Credit card: Fee income 27,416 26,799 25,275 Expense for network charges and rewards (13,239 ) (13,834 ) (10,699 ) Net credit card fees 14,177 12,965 14,576 Corporate card: Fee income 196,984 199,651 179,642 Expense for network charges and rewards (102,596 ) (100,011 ) (94,823 ) Net corporate card fees 94,388 99,640 84,819 Merchant: Fee income 31,517 30,241 31,863 Fees to cardholder banks (8,779 ) (7,831 ) (8,228 ) Expense for network charges (3,449 ) (3,177 ) (3,566 ) Net merchant fees 19,289 19,233 20,069 Total bank card transaction fees $ 167,879 $ 171,576 $ 155,100 The majority of debit and credit card fees are reported in the Consumer segment, while corporate card and merchant fees are reported in the Commercial segment. Debit and Credit Card Fees The Company issues debit and credit cards to its retail and commercial banking customers who use the cards to purchase goods and services from merchants through an electronic payment system. As a card issuer, the Company earns fees, including interchange income, for processing the cardholder’s purchase transaction with a merchant through a settlement network. Purchases are charged directly to a customer’s checking account (in the case of a debit card), or are posted to a customer’s credit card account. The fees earned are established by the settlement network and are dependent on the type of transaction processed but are typically based on a per unit charge. Interchange income, the largest component of debit and credit card fees, is settled daily through the networks. The services provided to the cardholders include issuing and maintaining cards, settling purchases with merchants, and maintaining memberships in various card networks to facilitate processing. These services are considered one performance obligation, as one of the services would not be performed without the others. The performance obligation is satisfied as services are rendered for each purchase transaction, and income is immediately recognized. In order to participate in the settlement network process, the Company must pay various transaction-related costs, established by the networks, including membership fees and a per unit charge for each transaction. These expenses are recorded net of the card fees earned. Consumer credit card products offer cardholders rewards that can be later redeemed for cash or goods or services to encourage card usage. Reward programs must meet network requirements based on the type of card issued. The expense associated with the rewards granted are recorded net of the credit card fees earned. Commercial card products offer cash rewards to corporate cardholders to encourage card usage in facilitating corporate payments. The Company pays cash rewards based on contractually agreed upon amounts, normally as a percent of each sales transaction. The expense associated with the cash rewards program is recorded net of the corporate card fees earned. Merchant Fees The Company offers merchant processing services to its business customers to enable them to accept credit and debit card payments. Merchant processing activities include gathering merchant sales information, authorizing sales transactions and collecting the funds from card issuers using the networks. The merchant is charged a merchant discount fee for the services based on agreed upon pricing between the merchant and the Company. Merchant fees are recorded net of outgoing interchange costs paid to the card issuing banks and net of other network costs as shown in the table above. Merchant services provided are considered one performance obligation, as one of the services would not be performed without the others. The performance obligation is satisfied as services are rendered for each settlement transaction and income is immediately recognized. Income earned from merchant fees settles with the customer according to terms negotiated in individual customer contracts. The majority of customers settle with the Company at least monthly. Trust Fees The following table shows the components of revenue within trust fees, which are reported within the Wealth segment. For the Years Ended December 31 (In thousands) 2019 2018 2017 Private client $ 118,832 $ 111,533 $ 100,358 Institutional 29,468 29,241 27,477 Other 7,328 7,190 7,324 Total trust fees $ 155,628 $ 147,964 $ 135,159 The Company provides trust and asset management services to both private client and institutional trust customers including asset custody, investment advice, and reporting and administrative services. Other specialized services such as tax preparation, financial planning, representation and other related services are provided as needed. Trust fees are generally earned monthly and billed based on a rate multiplied by the fair value of the customer's trust assets. The majority of customer trust accounts are billed monthly. However, some accounts are billed quarterly, and a small number of accounts are billed semi-annually or annually, in accordance with agreements in place with the customer. The Company accrues trust fees monthly based on an estimate of fees due and either directly charges the customer’s account the following month or invoices the customer for fees due according to the billing schedule. The Company maintains written product pricing information which is used to bill each trust customer based on the services provided. Providing trust services is considered to be a single performance obligation that is satisfied on a monthly basis, involving the monthly custody of customer assets, statement rendering, periodic investment advice where applicable, and other specialized services as needed. As such, performance obligations are considered to be satisfied at the conclusion of each month while trust fee income is also recorded monthly. Deposit Account Charges and Other Fees The following table shows the components of revenue within deposit account charges and other fees. For the Years Ended December 31 (In thousands) 2019 2018 2017 Corporate cash management fees $ 41,442 $ 38,468 $ 36,044 Overdraft and return item fees 30,596 31,468 30,576 Other service charges on deposit accounts 23,945 24,581 23,440 Total deposit account charges and other fees $ 95,983 $ 94,517 $ 90,060 Approximately half of this revenue is reported in the Consumer segment, while the remainder is reported in the Commercial segment. The Company provides corporate cash management services to its business and non-profit customers to meet their various transaction processing needs. Such services include deposit and check processing, lockbox, remote deposit, reconciliation, on-line banking and other similar transaction processing services. The Company maintains unit prices for each type of service, and the customer is billed based on transaction volumes processed monthly. The customer is usually billed either monthly or quarterly, however, some customers may be billed semi-annually or annually. The customer may pay for the cash management services provided either by paying in cash or using the value of deposit balances (formula provided to the customer) held at the Company. The Company’s performance obligation for corporate cash management services is the processing of items over a monthly term, and the obligations are satisfied at the conclusion of each month. Overdraft fees are charged to customers when daily checks and other withdrawals to customers’ accounts exceed balances on hand. Fees are based on a unit price multiplied by the number of items processed whose total amounts exceed the available account balance. The daily overdraft charge is calculated and the fee is posted to the customer’s account each day. The Company’s performance obligations for overdraft transactions is based on the daily transaction processed and the obligation is satisfied as each day’s transaction processing is concluded. Other deposit fees include numerous smaller fees such as monthly statement fees, foreign ATM processing fees, identification restoration fees, and stop payment fees. Such fees are mostly billed to customers directly on their monthly deposit account statements, or in the case of foreign ATM processing fees, the fee is charged to the customer on the day that transactions are processed. Performance obligations for all of these various services are satisfied at the time that the service is rendered. Consumer Brokerage Services The following shows the components of revenue within consumer brokerage services, and nearly all of this revenue is reported in the Company's Wealth segment. For the Years Ended December 31 (In thousands) 2019 2018 2017 Commission income $ 9,071 $ 8,956 $ 8,400 Managed account services 6,733 6,851 6,230 Total consumer brokerage services $ 15,804 $ 15,807 $ 14,630 Consumer brokerage services revenue is comprised of commissions received upon the execution of purchases and sales of mutual fund shares and equity securities, in addition to sales of annuities and certain limited insurance products in an agency capacity. Also, fees are earned on professionally managed advisory programs through arrangements with sub-advisors. Payment from the customer is due upon settlement date for purchases and sales of securities, at the purchase date for annuities and insurance products, and upon inception of the service period for advisory programs. Most of the contracts (except advisory contracts) encompass two types of performance obligations. The first is an obligation to provide account maintenance, record keeping and custodial services throughout the contract term. The second is the obligation to provide trade execution services for the customers' purchases and sales of products mentioned above. The first obligation is satisfied over time as the service period elapses, while the second type of obligation is satisfied upon the execution of each purchase/sale transaction. Contracts for advisory services contain a single performance obligation comprised of providing the management services and related reporting/administrative services over the contract term. The transaction price of the contracts (except advisory contracts) is a commission charged at the time of trade execution. The commission varies across different security types, insurance products and mutual funds. It is generally determined by standardized price lists published by the Company and its mutual fund and insurance vendors. Because the transaction price relates specifically to the trade execution, it has been allocated to that performance obligation and is recorded at the time of execution. The fee for advisory services is charged to the customer in advance of the quarterly service period, based on the account balance at the beginning of the period. Revenue is recognized ratably over the service period. Other Non-Interest Income from Contracts with Customers Other non-interest income from contracts with customers consists mainly of various customer deposit related fees such as ATM fees and gains on sales of tax credits, foreclosed assets, and bank premises and equipment. Performance obligations for these services consist mainly of the execution of transactions for sales of various properties or providing specific deposit related transactions. Fees from these revenue sources are recognized when the performance obligation is completed, at which time cash is received by the Company.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	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. When determining the fair value measurements for assets and liabilities required or permitted to be recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to observable market data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets, and the Company must use alternative valuation techniques to derive an estimated fair value measurement. Instruments Measured at Fair Value on a Recurring Basis The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2019 and 2018 . There were no transfers among levels during these years. 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) 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 December 31, 2018 Assets: Residential mortgage loans held for sale $ 13,529 $ — $ 13,529 $ — Available for sale debt securities: U.S. government and federal agency obligations 907,652 907,652 — — Government-sponsored enterprise obligations 195,778 — 195,778 — State and municipal obligations 1,328,039 — 1,313,881 14,158 Agency mortgage-backed securities 3,214,985 — 3,214,985 — Non-agency mortgage-backed securities 1,047,716 — 1,047,716 — Asset-backed securities 1,511,614 — 1,511,614 — Other debt securities 332,257 — 332,257 — Trading debt securities 27,059 — 27,059 — Equity securities 2,585 2,585 — — Private equity investments 85,659 — — 85,659 Derivatives * 41,210 — 40,627 583 Assets held in trust for deferred compensation plan 12,968 12,968 — — Total assets 8,721,051 923,205 7,697,446 100,400 Liabilities: Derivatives * 13,421 — 13,328 93 Liabilities held in trust for deferred compensation plan 12,968 12,968 — — Total liabilities $ 26,389 $ 12,968 $ 13,328 $ 93 * The fair value of each class of derivative is shown in Note 19. . Valuation methods for instruments measured at fair value on a recurring basis Following is a description of the Company’s valuation methodologies used for instruments measured at fair value on a recurring basis: Residential mortgage loans held for sale The Company originates fixed rate, first lien residential mortgage loans that are intended for sale in the secondary market. Fair value is based on quoted secondary market prices for loans with similar characteristics, which are adjusted to include the embedded servicing value in the loans. This adjustment represents an unobservable input to the valuation but is not considered significant given the relative insensitivity of the valuation to changes in this input. Accordingly, these loan measurements are classified as Level 2. Available for sale debt securities For available for sale securities, changes in fair value, including that portion of other-than-temporary impairment unrelated to credit loss, are recorded in other comprehensive income. As mentioned in Note 3 on Investment Securities, the Company records the credit-related portion of other-than-temporary impairment in current earnings. This portfolio comprises the majority of the assets which the Company records at fair value. Most of the portfolio, which includes government-sponsored enterprise, mortgage-backed and asset-backed securities, are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace. These measurements are classified as Level 2 in the fair value hierarchy. Where quoted prices are available in an active market, the measurements are classified as Level 1. Most of the Level 1 measurements apply to U.S. Treasury obligations. The fair values of Level 1 and 2 securities in the available for sale portfolio are prices provided by a third-party pricing service. The prices provided by the third-party pricing service are based on observable market inputs, as described in the sections below. On a quarterly basis, the Company compares a sample of these prices to other independent sources for the same and similar securities. Variances are analyzed, and, if appropriate, additional research is conducted with the third-party pricing service. Based on this research, the pricing service may affirm or revise its quoted price. No significant adjustments have been made to the prices provided by the pricing service. The pricing service also provides documentation on an ongoing basis that includes reference data, inputs and methodology by asset class, which is reviewed to ensure that security placement within the fair value hierarchy is appropriate. Valuation methods and inputs, by class of security: • U.S. government and federal agency obligations U.S. treasury bills, bonds and notes, including inflation-protected securities, are valued using live data from active market makers and inter-dealer brokers. Valuations for stripped coupon and principal issues are derived from yield curves generated from various dealer contacts and live data sources. • Government-sponsored enterprise obligations Government-sponsored enterprise obligations are evaluated using cash flow valuation models. Inputs used are live market data, cash settlements, Treasury market yields, and floating rate indices such as LIBOR, CMT, and Prime. • State and municipal obligations, excluding auction rate securities A yield curve is generated and applied to bond sectors, and individual bond valuations are extrapolated. Inputs used to generate the yield curve are bellwether issue levels, established trading spreads between similar issuers or credits, historical trading spreads over widely accepted market benchmarks, new issue scales, and verified bid information. Bid information is verified by corroborating the data against external sources such as broker-dealers, trustees/paying agents, issuers, or non-affiliated bondholders. • Mortgage and asset-backed securities Collateralized mortgage obligations and other asset-backed securities are valued at the tranche level. For each tranche valuation, the process generates predicted cash flows for the tranche, applies a market based (or benchmark) yield/spread for each tranche, and incorporates deal collateral performance and tranche level attributes to determine tranche-specific spreads to adjust the benchmark yield. Tranche cash flows are generated from new deal files and prepayment/default assumptions. Tranche spreads are based on tranche characteristics such as average life, type, volatility, ratings, underlying collateral and performance, and prevailing market conditions. The appropriate tranche spread is applied to the corresponding benchmark, and the resulting value is used to discount the cash flows to generate an evaluated price. Valuation of agency pass-through securities, typically issued under GNMA, FNMA, FHLMC, and SBA programs, are primarily derived from information from the to-be-announced (TBA) market. This market consists of generic mortgage pools which have not been received for settlement. Snapshots of the TBA market, using live data feeds distributed by multiple electronic platforms, are used in conjunction with other indices to compute a price based on discounted cash flow models. • Other debt securities Other debt securities are valued using active markets and inter-dealer brokers as well as bullet spread scales and option adjusted spreads. The spreads and models use yield curves, terms and conditions of the bonds, and any special features (e.g., call or put options and redemption features). The available for sale portfolio includes certain auction rate securities. Due to the illiquidity in the auction rate securities market in recent years, the fair value of these securities cannot be based on observable market prices. The fair values of these securities are estimated using a discounted cash flows analysis which is discussed more fully in the Level 3 Inputs section of this note. Because many of the inputs significant to the measurement are not observable, these measurements are classified as Level 3 measurements. Equity securities with readily determinable fair values Equity securities are priced using the market prices for each security from the major stock exchanges or other electronic quotation systems. These are generally classified as Level 1 measurements. Stocks which trade infrequently are classified as Level 2. Trading debt securities The securities in the Company’s trading portfolio are priced by averaging several broker quotes for similar instruments and are classified as Level 2 measurements. Private equity investments These securities are held by the Company’s private equity subsidiaries and are included in other investment securities in the consolidated balance sheets. Due to the absence of quoted market prices, valuation of these nonpublic investments requires significant management judgment. These fair value measurements, which are discussed in the Level 3 Inputs section of this note, are classified as Level 3. Derivatives The Company’s derivative instruments include interest rate swaps and floors, foreign exchange forward contracts, and certain credit risk guarantee agreements. When appropriate, the impact of credit standing as well as any potential credit enhancements, such as collateral, has been considered in the fair value measurement. • Valuations for interest rate swaps are derived from a proprietary model whose significant inputs are readily observable market parameters, primarily yield curves used to calculate current exposure. Counterparty credit risk is incorporated into the model and calculated by applying a net credit spread over LIBOR to the swap's total expected exposure over time. The net credit spread is comprised of spreads for both the Company and its counterparty, derived from probability of default and other loss estimate information obtained from a third party credit data provider or from the Company's Credit Department when not otherwise available. The credit risk component is not significant compared to the overall fair value of the swaps. The results of the model are constantly validated through comparison to active trading in the marketplace. Parties to swaps requiring central clearing are required to post collateral (generally in the form of cash or marketable securities) to an authorized clearing agency that holds and monitors the collateral. In January 2017, the Company's clearing counterparty made rule changes to characterize a component of this collateral as a legal settlement of the derivative contract exposure. As a result, this component, known as variation margin, is no longer accounted for separately from the derivative as collateral, but is considered in determining the fair value of the derivative. Valuations for interest rate floors are also derived from a proprietary model whose significant inputs are readily observable market parameters, primarily yield curves and volatility surfaces. The model uses market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below the strike rates of the floors. The model also incorporates credit valuation adjustments of both the Company's and the counterparties' non- performance risk. The credit valuation adjustment component is not significant compared to the overall fair value of the floors. The fair value measurements of interest rate swaps and floors are classified as Level 2 due to the observable nature of the significant inputs utilized. • Fair value measurements for foreign exchange contracts are derived from a model whose primary inputs are quotations from global market makers and are classified as Level 2. • The Company’s contracts related to credit risk guarantees are valued under a proprietary model which uses unobservable inputs and assumptions about the creditworthiness of the counterparty (generally a Bank customer). Customer credit spreads, which are based on probability of default and other loss estimates, are calculated internally by the Company's Credit Department, as mentioned above, and are based on the Company's internal risk rating for each customer. Because these inputs are significant to the measurements, they are classified as Level 3. • Derivatives relating to residential mortgage loan sale activity include commitments to originate mortgage loans held for sale, forward loan sale contracts, and forward commitments to sell TBA securities. The fair values of loan commitments and sale contracts are estimated using quoted market prices for loans similar to the underlying loans in these instruments. The valuations of loan commitments are further adjusted to include embedded servicing value and the probability of funding. These assumptions are considered Level 3 inputs and are significant to the loan commitment valuation; accordingly, the measurement of loan commitments is classified as Level 3. The fair value measurement of TBA contracts is based on security prices published on trading platforms and is classified as Level 2. Assets held in trust Assets held in an outside trust for the Company’s deferred compensation plan consist of investments in mutual funds. The fair value measurements are based on quoted prices in active markets and classified as Level 1. The Company has recorded an asset representing the total investment amount. The Company has also recorded a corresponding liability, representing the Company’s liability to the plan participants. 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 Year ended December 31, 2019: Balance at January 1, 2019 $ 14,158 $ 85,659 $ 490 $ 100,307 Total gains or losses (realized/unrealized): Included in earnings — (727 ) (93 ) (820 ) Included in other comprehensive income 246 — — 246 Investment securities called (4,635 ) — — (4,635 ) Discount accretion 84 — — 84 Purchases of private equity securities — 15,706 — 15,706 Sale / pay down of private equity securities — (6,548 ) — (6,548 ) Capitalized interest/dividends — 32 — 32 Purchase of risk participation agreement — — 439 439 Sale of risk participation agreement — — (467 ) (467 ) Balance at December 31, 2019 $ 9,853 $ 94,122 $ 369 $ 104,344 Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2019 $ — $ (2,177 ) $ 457 $ (1,720 ) Year ended December 31, 2018: Balance at January 1, 2018 $ 17,016 $ 55,752 $ 503 $ 73,271 Total gains or losses (realized/unrealized): Included in earnings — 13,849 105 13,954 Included in other comprehensive income (274 ) — — (274 ) Investment securities called (2,616 ) — — (2,616 ) Discount accretion 32 — — 32 Purchases of private equity securities — 16,395 — 16,395 Sale / pay down of private equity securities — (371 ) — (371 ) Capitalized interest/dividends — 34 — 34 Purchase of risk participation agreement — — 61 61 Sale of risk participation agreement — — (179 ) (179 ) Balance at December 31, 2018 $ 14,158 $ 85,659 $ 490 $ 100,307 Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2018 $ — $ 13,849 $ 663 $ 14,512 Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories: (In thousands) Loan Fees and Sales Other Non-Interest Income Investment Securities Gains (Losses), Net Total Year ended December 31, 2019: Total gains or losses included in earnings $ (77 ) $ (16 ) $ (727 ) $ (820 ) Change in unrealized gains or losses relating to assets still held at December 31, 2019 $ 458 $ (1 ) $ (2,177 ) $ (1,720 ) Year ended December 31, 2018: Total gains or losses included in earnings $ (45 ) $ 150 $ 13,849 $ 13,954 Change in unrealized gains or losses relating to assets still held at December 31, 2018 $ 535 $ 128 $ 13,849 $ 14,512 Level 3 Inputs As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, 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 $9.9 million at December 31, 2019 , while private equity investments, included in other securities, totaled $94.1 million . Information about these inputs is presented in the table and discussions 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 Estimated market rate 3.4% - 3.7% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 47.8% - 100.0% 83.7% Embedded servicing value —% - 2.3% 1.2% The fair values of ARS are estimated using a discounted cash flows analysis in which estimated cash flows are based on mandatory interest rates paid under failing auctions and projected over an estimated market recovery period. Under normal conditions, ARS traded in weekly auctions and were considered liquid investments. The Company's estimate of when these auctions might resume is highly judgmental and subject to variation depending on current and projected market conditions. Few auctions of these securities have been successful in recent years, and most secondary transactions have been privately arranged. Estimated cash flows during the period over which the Company expects to hold the securities are discounted at an estimated market rate. These securities are comprised of bonds issued by various states and municipalities for healthcare and student lending purposes, and market rates are derived for each type. Market rates are calculated at each valuation date using a LIBOR or Treasury based rate plus spreads representing adjustments for liquidity premium and nonperformance risk. The spreads are developed internally by employees in the Company's bond department. An increase in the holding period alone would result in a higher fair value measurement, while an increase in the estimated market rate (the discount rate) alone would result in a lower fair value measurement. The valuation of the ARS portfolio is reviewed on a quarterly basis by the Company's chief investment officers. The fair values of the Company's private equity investments are based on a determination of fair value of the investee company less preference payments assuming the sale of the investee company. Investee companies are normally non-public entities. The fair value of the investee company is determined by reference to the investee's total earnings before interest, depreciation/amortization, and income taxes (EBITDA) multiplied by an EBITDA factor. EBITDA is normally determined based on a trailing prior period adjusted for specific factors including current economic outlook, investee management, and specific unique circumstances such as sales order information, major customer status, regulatory changes, etc. The EBITDA multiple is based on management's review of published trading multiples for recent private equity transactions and other judgments and is derived for each individual investee. The fair value of the Company's investment is then calculated based on its ownership percentage in the investee company. On a quarterly basis, these fair value analyses are reviewed by a valuation committee consisting of investment managers and senior Company management. The significant unobservable inputs used in the fair value measurement of the Company’s derivative commitments to originate residential mortgage loans are the percentage of commitments that are actually funded and the mortgage servicing value that is inherent in the underlying loan value. A significant increase in the rate of loans that fund would result in a larger derivative asset or liability. A significant increase in the inherent mortgage servicing value would result in an increase in the derivative asset or a reduction in the derivative liability. The probability of funding and the inherent mortgage servicing values are directly impacted by changes in market rates and will generally move in the same direction as interest rates. Instruments Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis during 2019 and 2018 , and still held as of December 31, 2019 and 2018 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2019 and 2018 . 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) Balance at December 31, 2019 Collateral dependent impaired loans $ 422 $ — $ — $ 422 $ (263 ) Mortgage servicing rights 7,749 — — 7,749 (327 ) Long-lived assets 1,098 — — 1,098 (362 ) Balance at December 31, 2018 Collateral dependent impaired loans $ 294 $ — $ — $ 294 $ (269 ) Mortgage servicing rights 6,478 — — 6,478 9 Long-lived assets 914 — — 914 (552 ) Valuation methods for instruments measured at fair value on a nonrecurring basis Following is a description of the Company’s valuation methodologies used for other financial and nonfinancial instruments measured at fair value on a nonrecurring basis. Collateral dependent impaired loans While the overall loan portfolio is not carried at fair value, the Company periodically records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral dependent loans when establishing the allowance for loan losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan. In determining the value of real estate collateral, the Company relies on external and internal appraisals of property values depending on the size and complexity of the real estate collateral. The Company maintains a staff of qualified appraisers who also review third party appraisal reports for reasonableness. In the case of non-real estate collateral, reliance is placed on a variety of sources, including external estimates of value and judgments based on the experience and expertise of internal specialists. Values of all loan collateral are regularly reviewed by credit administration. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable. These measurements are classified as Level 3. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company at December 31, 2019 and 2018 are shown in the table above. Mortgage servicing rights The Company initially measures its mortgage servicing rights at fair value and amortizes them over the period of estimated net servicing income. They are periodically assessed for impairment based on fair value at the reporting date. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the fair value is estimated based on a valuation model which calculates the present value of estimated future net servicing income. The model incorporates assumptions that market participants use in estimating future net servicing income, including estimates of prepayment speeds, market discount rates, cost to service, float earnings rates, and other ancillary income, including late fees. The fair value measurements are classified as Level 3. Long-lived assets

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
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 December 31, 2019 and 2018 : 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 Carrying Amount Estimated Fair Value at December 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 5,106,427 $ — $ — $ 5,017,694 $ 5,017,694 Real estate - construction and land 869,659 — — 868,274 868,274 Real estate - business 2,875,788 — — 2,846,095 2,846,095 Real estate - personal 2,127,083 — — 2,084,370 2,084,370 Consumer 1,955,572 — — 1,916,627 1,916,627 Revolving home equity 376,399 — — 365,069 365,069 Consumer credit card 814,134 — — 756,651 756,651 Overdrafts 15,236 — — 11,223 11,223 Total loans 14,140,298 — — 13,866,003 13,866,003 Loans held for sale 20,694 — 20,694 — 20,694 Investment securities 8,698,666 910,237 7,643,290 145,139 8,698,666 Federal funds sold 3,320 3,320 — — 3,320 Securities purchased under agreements to resell 700,000 — — 693,228 693,228 Interest earning deposits with banks 689,876 689,876 — — 689,876 Cash and due from banks 507,892 507,892 — — 507,892 Derivative instruments 41,210 — 40,627 583 41,210 Assets held in trust for deferred compensation plan 12,968 12,968 — — 12,968 Total $ 24,814,924 $ 2,124,293 $ 7,704,611 $ 14,704,953 $ 24,533,857 Financial Liabilities Non-interest bearing deposits $ 6,980,298 $ 6,980,298 $ — $ — $ 6,980,298 Savings, interest checking and money market deposits 11,685,239 11,685,239 — — 11,685,239 Certificates of deposit 1,658,122 — — 1,663,748 1,663,748 Federal funds purchased 13,170 13,170 — — 13,170 Securities sold under agreements to repurchase 1,943,219 — — 1,944,458 1,944,458 Other borrowings 8,702 — 7,751 951 8,702 Derivative instruments 13,421 — 13,328 93 13,421 Liabilities held in trust for deferred compensation plan 12,968 12,968 — — 12,968 Total $ 22,315,139 $ 18,691,675 $ 21,079 $ 3,609,250 $ 22,322,004

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2019
Derivative Instrument Detail [Abstract]
Derivative Instruments	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. With the exception of the interest rate floors (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. December 31 (In thousands) 2019 2018 Interest rate swaps $ 2,606,181 $ 2,006,280 Interest rate floors 1,500,000 1,000,000 Interest rate caps 59,316 62,163 Credit risk participation agreements 316,225 143,460 Foreign exchange contracts 10,936 6,206 Mortgage loan commitments 13,755 14,544 Mortgage loan forward sale contracts 1,943 5,768 Forward TBA contracts 17,500 16,500 Total notional amount $ 4,525,856 $ 3,254,921 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 December 31, 2019 , the Company has entered into three interest rate floors with a combined notional value of $1.5 billion , to hedge the risk of declining interest rates on certain floating rate commercial loans indexed to one month LIBOR. The first interest rate floor has a purchased strike rate of 2.25% and became effective on January 1, 2020 and matures on January 1, 2026 . The second interest rate floor has a purchased strike rate of 2.50% and is effective on June 1, 2020 and matures on June 1, 2026 . The third interest rate floor has a purchased strike rate of 2.00% and is effective December 15, 2020 and matures on December 15, 2026 . The premiums paid for these floors totaled $31.3 million . As of December 31, 2019 , the maximum length of time over which the Company is hedging its exposure to the variability in future cash flows is approximately 7.0 years. The interest rate floors qualified and were designated as cash flow hedges and were assessed for effectiveness using regression analysis. The change in the fair value of the interest rate floors are 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 December 31, 2019 , net deferred gains on the interest rate floors totaled $40.4 million (pre-tax) and were recorded in AOCI in the consolidated balance sheet. As of December 31, 2019 , it is expected that $4.1 million (pre-tax) of interest rate floor premium amortization will be reclassified from AOCI into earnings over the next twelve months. 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 21 on Commitments, Contingencies and 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. 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 offset against the fair values of cleared swaps, such that at December 31, 2019 in the table below, 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 . At December 31, 2018 , the positive fair values of cleared swaps were reduced by $8.1 million and the negative fair values of cleared swaps were reduced by $6.5 million . Asset Derivatives Liability Derivatives December 31 December 31 2019 2018 2019 2018 (In thousands ) Fair Value Fair Value Derivatives designated as hedging instruments: Interest rate floors $ 67,192 $ 29,031 $ — $ — Total derivatives designated as hedging instruments $ 67,192 $ 29,031 $ — $ — Derivatives not designated as hedging instruments: Interest rate swaps $ 37,774 $ 11,537 $ (9,916 ) $ (13,110 ) Interest rate caps 4 24 (4 ) (24 ) Credit risk participation agreements 140 47 (230 ) (93 ) Foreign exchange contracts 97 20 (32 ) (8 ) Mortgage loan commitments 459 536 — — Mortgage loan forward sale contracts 6 15 (2 ) (8 ) Forward TBA contracts 2 — (35 ) (178 ) Total derivatives not designated as hedging instruments $ 38,482 $ 12,179 $ (10,219 ) $ (13,421 ) Total $ 105,674 $ 41,210 $ (10,219 ) $ (13,421 ) 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 (In thousands) Total Included Component Excluded Component For the Year Ended December 31, 2019 Derivatives in cash flow hedging relationships: Interest rate floors* $ 27,481 $ 50,327 $ (22,846 ) Interest and fees on loans $ (3,793 ) $ — $ (3,793 ) Total $ 27,481 $ 50,327 $ (22,846 ) Total $ (3,793 ) $ — $ (3,793 ) For the Year Ended December 31, 2018 Derivatives in cash flow hedging relationships: Interest rate floors* $ 8,381 $ — $ 8,381 Interest and fees on loans $ (760 ) $ — $ (760 ) Total $ 8,381 $ — $ 8,381 Total $ (760 ) $ — $ (760 ) * No hedging relationship existed during 2017. Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative For the Years Ended December 31 (In thousands) 2019 2018 2017 Derivative instruments: Interest rate swaps Other non-interest income $ 4,732 $ 3,914 $ 1,978 Interest rate caps Other non-interest income — 11 — Credit risk participation agreements Other non-interest income (16 ) 150 35 Foreign exchange contracts: Other non-interest income 53 31 (80 ) Mortgage loan commitments Loan fees and sales (77 ) (45 ) 231 Mortgage loan forward sale contracts Loan fees and sales (3 ) 5 64 Forward TBA contracts Loan fees and sales (837 ) 414 (648 ) Total $ 3,852 $ 4,480 $ 1,580 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. While the Company is party to master netting arrangements with most of its swap derivative counterparties, the Company does not offset derivative assets and liabilities under these arrangements on its consolidated balance sheet. Collateral exchanged between the Company and dealer bank counterparties is generally subject to thresholds and transfer minimums, and usually consist 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 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 December 31, 2018 Assets: Derivatives subject to master netting agreements $ 40,613 $ — $ 40,613 $ (2,992 ) $ (26,174 ) $ 11,447 Derivatives not subject to master netting agreements 597 — 597 Total derivatives 41,210 — 41,210 Liabilities: Derivatives subject to master netting agreements 13,333 — 13,333 (2,992 ) (261 ) 10,080 Derivatives not subject to master netting agreements 88 — 88 Total derivatives 13,421 — 13,421

Resale and Repurchase Agreement

Resale and Repurchase Agreements Resale and Repurchase Agreements	12 Months Ended
	Dec. 31, 2019
Offsetting [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 December 31, 2019 and $450.0 million at December 31, 2018 . At December 31, 2019 , the Company had posted collateral of $204.3 million in marketable securities, consisting of agency mortgage-backed bonds, and had accepted $209.6 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 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 ) — December 31, 2018 Total resale agreements, subject to master netting arrangements $ 1,150,000 $ (450,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 2,393,219 (450,000 ) 1,943,219 — (1,943,219 ) — The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2019 and 2018 , 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 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 December 31, 2018 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 387,541 $ 150,000 $ 100,000 $ 637,541 Government-sponsored enterprise obligations 18,466 — — 18,466 Agency mortgage-backed securities 882,744 31,774 213,752 1,128,270 Non-agency mortgage-backed securities 187,740 — — 187,740 Asset-backed securities 322,680 — — 322,680 Other debt securities 98,522 — — 98,522 Total repurchase agreements, gross amount recognized $ 1,897,693 $ 181,774 $ 313,752 $ 2,393,219

Commitments, Contingencies And

Commitments, Contingencies And Guarantees	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies And Guarantees	Commitments, Contingencies and Guarantees The Company engages in various transactions and commitments with off-balance sheet risk in the normal course of business to meet customer financing needs. The Company uses the same credit policies in making the commitments and conditional obligations described below as it does for on-balance sheet instruments. The following table summarizes these commitments at December 31: (In thousands) 2019 2018 Commitments to extend credit: Credit card $ 5,063,166 $ 5,328,502 Other 6,123,264 5,840,967 Standby letters of credit, net of participations 377,338 353,905 Commercial letters of credit 7,050 13,774 Commitments to extend credit are legally binding agreements to lend to a borrower providing there are no violations of any conditions established in the contract. As many of the commitments are expected to expire without being drawn upon, the total commitment does not necessarily represent future cash requirements. Refer to Note 2 on Loans and Allowance for Loan Losses for further discussion. Commercial letters of credit act as a means of ensuring payment to a seller upon shipment of goods to a buyer. The majority of commercial letters of credit issued are used to settle payments in international trade. Typically, letters of credit require presentation of documents which describe the commercial transaction, evidence shipment, and transfer title. 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 the customer, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities. At December 31, 2019 , the Company had recorded a liability in the amount of $2.6 million , representing the carrying value of the guarantee obligations associated with the standby letters of credit. This amount will be accreted into income over the remaining life of the respective commitments. Commitments outstanding under these letters of credit, which represent the maximum potential future payments guaranteed by the Company, were $377.3 million at December 31, 2019 . The Company regularly purchases various state tax credits arising from third-party property redevelopment. These credits are either resold to third parties or retained for use by the Company. During 2019 , purchases and sales of tax credits amounted to $90.6 million and $84.9 million , respectively. At December 31, 2019 , the Company had outstanding purchase commitments totaling $160.9 million that it expects to fund in 2020 . The Company periodically enters into 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 December 31, 2019 , 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 3 to 11 years. At December 31, 2019 , the fair value of the Company's guarantee liability RPAs was $230 thousand , and the notional amount of the underlying swaps was $208.9 million . The maximum potential future payment guaranteed by the Company cannot be readily estimated and is dependent upon the fair value of the interest rate swaps at the time of default. The Company has various legal proceedings pending at December 31, 2019 , 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 very 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.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Parties	Related Parties The Company’s Chief Executive Officer, its Executive Chairman, and its former Vice Chairman are directors of Tower Properties Company (Tower) and, together with members of their immediate families, beneficially own approximately 67% of the outstanding stock of Tower. At December 31, 2019 , Tower owned 211,996 shares of Company stock. Tower is primarily engaged in the business of owning, developing, leasing and managing real property. Payments from the Company and its affiliates to Tower are summarized below. These payments, with the exception of dividend payments, relate to property management services, including construction oversight, on three Company-owned office buildings and related parking garages in downtown Kansas City. (In thousands) 2019 2018 2017 Leasing agent fees $ 154 $ 133 $ 32 Operation of parking garages 118 95 82 Building management fees 2,001 1,935 1,954 Property construction management fees 250 136 146 Dividends paid on Company stock held by Tower 210 181 232 Total $ 2,733 $ 2,480 $ 2,446 Tower has a $13.5 million line of credit with the Bank which is subject to normal credit terms and has a variable interest rate. The line of credit is collateralized by Company stock and based on collateral value had a maximum borrowing amount of approximately $11.5 million at December 31, 2019 . There were no borrowings under this line during 2019 , and no balance outstanding at December 31, 2019 . There were no borrowings during 2018 , and the maximum borrowings during 2017 were $5.2 million . There was no balance outstanding at December 31, 2018 or 2017 . Interest paid on borrowings during the last three years was not significant. Letters of credit may be collateralized under this line of credit; however, there were no letters of credit outstanding during 2019 , 2018 or 2017 , and thus, no fees were received during these periods. From time to time, the Bank extends additional credit to Tower for construction and development projects. No construction loans were outstanding during 2019 , 2018 and 2017 . Tower leases office space in the Kansas City bank headquarters building owned by the Company. Rent paid to the Company totaled $75 thousand in 2019 , $74 thousand in 2018 , and $74 thousand in 2017 , at $17.00 , $16.69 and $15.75 per square foot, respectively. Directors of the Company and their beneficial interests have deposit accounts with the Bank and may be provided with cash management and other banking services, including loans, in the ordinary course of business. Such loans were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other unrelated persons and did not involve more than the normal risk of collectability. As discussed in Note 21 on Commitments, Contingencies and Guarantees, the Company regularly purchases various state tax credits arising from third-party property redevelopment and resells the credits to third parties. During 2019 , the Company sold state tax credits to its Executive Chairman, its former Vice Chairman, its Chief Executive Officer, and its Chief Credit Officer in the amount of $865 thousand , $663 thousand , $166 thousand , and $83 thousand , respectively, for personal tax planning. During 2018 , the Company sold state tax credits to its Executive Chairman, its former Vice Chairman, and its Chief Executive Officer in the amount of $831 thousand , $759 thousand , and $119 thousand , respectively. During 2017 , the Company sold state tax credits to its Executive Chairman, its former Vice Chairman, and its Chief Executive Officer in the amount of $694 thousand , $598 thousand , and $67 thousand , respectively. The terms of the sales and the amounts paid were the same as the terms and amounts paid for similar tax credits by persons not related to the Company.

Parent Company Condensed Financ

Parent Company Condensed Financial Statements	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Parent Company Condensed Financial Statements	Parent Company Condensed Financial Statements Following are the condensed financial statements of Commerce Bancshares, Inc. (Parent only) for the periods indicated: Condensed Balance Sheets December 31 (In thousands) 2019 2018 Assets Investment in consolidated subsidiaries: Bank $ 2,687,692 $ 2,587,489 Non-banks 71,290 67,538 Cash 301,913 207,462 Investment securities: Available for sale debt 1,399 2,576 Equity 2,969 3,191 Note receivable due from bank subsidiary 50,000 50,000 Advances to subsidiaries, net of borrowings 26,097 19,867 Income tax benefits 9,973 8,590 Other assets 23,528 23,734 Total assets $ 3,174,861 $ 2,970,447 Liabilities and stockholders’ equity Pension obligation $ 13,028 $ 12,645 Other liabilities 27,149 26,504 Total liabilities 40,177 39,149 Stockholders’ equity 3,134,684 2,931,298 Total liabilities and stockholders’ equity $ 3,174,861 $ 2,970,447 Condensed Statements of Income For the Years Ended December 31 (In thousands) 2019 2018 2017 Income Dividends received from consolidated bank subsidiary $ 500,000 $ 200,000 $ 160,002 Earnings of consolidated subsidiaries, net of dividends (79,641 ) 233,785 147,678 Interest and dividends on investment securities 1,698 10,698 2,099 Management fees charged to subsidiaries 36,776 37,688 30,431 Investment securities gains (losses) 3,572 (4,581 ) 41,717 Net interest income on advances and note to subsidiaries 1,208 1,299 514 Other 4,700 2,390 3,346 Total income 468,313 481,279 385,787 Expense Salaries and employee benefits 32,882 33,588 33,714 Professional fees 2,050 2,383 2,036 Data processing fees paid to affiliates 3,142 3,341 3,512 Community service 87 152 32,093 Other 13,019 10,729 10,671 Total expense 51,180 50,193 82,026 Income tax benefit (4,098 ) (2,456 ) (15,622 ) Net income $ 421,231 $ 433,542 $ 319,383 Condensed Statements of Cash Flows For the Years Ended December 31 (In thousands ) 2019 2018 2017 Operating Activities Net income $ 421,231 $ 433,542 $ 319,383 Adjustments to reconcile net income to net cash provided by operating activities: Earnings of consolidated subsidiaries, net of dividends 79,641 (233,785 ) (147,678 ) Other adjustments, net 2,491 2,505 (11,268 ) Net cash provided by operating activities 503,363 202,262 160,437 Investing Activities Decrease in securities purchased under agreements to resell — — 155,775 (Increase) decrease in investment in subsidiaries, net (12 ) — 11 Proceeds from sales of investment securities 3,856 41,638 11,006 Proceeds from maturities/pay downs of investment securities 1,150 1,988 2,295 Purchases of investment securities (63 ) (125 ) — Note receivable due from bank subsidiary — — (50,000 ) Increase in advances to subsidiaries, net (6,230 ) (5,296 ) (9,518 ) Net purchases of building improvements and equipment (235 ) (133 ) (52 ) Net cash provided by (used in) investing activities (1,534 ) 38,072 109,517 Financing Activities Purchases of treasury stock (134,904 ) (75,231 ) (17,771 ) Accelerated share repurchase agreements (150,000 ) — — Issuance of stock under equity compensation plans (8 ) (10 ) (8 ) Cash dividends paid on common stock (113,466 ) (100,238 ) (91,619 ) Cash dividends paid on preferred stock (9,000 ) (9,000 ) (9,000 ) Net cash used in financing activities (407,378 ) (184,479 ) (118,398 ) Increase in cash 94,451 55,855 151,556 Cash at beginning of year 207,462 151,607 51 Cash at end of year $ 301,913 $ 207,462 $ 151,607 Income tax receipts, net $ (2,337 ) $ (1,965 ) $ (8,991 ) Dividends paid by the Parent to its shareholders were substantially provided from Bank dividends. The Bank may distribute common dividends without prior regulatory approval, provided that the dividends do not exceed the sum of net income for the current year and retained net income for the preceding two years, subject to maintenance of minimum capital requirements. The Parent charges fees to its subsidiaries for management services provided, which are allocated to the subsidiaries based primarily on total average assets. The Parent makes cash advances to its private equity subsidiaries for general short-term cash flow purposes. Advances may be made to the Parent by its subsidiary bank holding company for temporary investment of idle funds. Interest on such advances is based on market rates. In 2017, the Bank borrowed $50.0 million from the Parent as part of its strategy to manage FDIC insurance premiums. The note has a rolling 13 month maturity, and the interest rate is a variable rate equal to the one year treasury rate. For the past several years, the Parent has maintained a $20.0 million line of credit for general corporate purposes with the Bank. The Parent has not borrowed under this line during the past three years. At December 31, 2019 , the fair value of the investment securities held by the Parent consisted of investments of $2.8 million in preferred stock with readily determinable fair values, $188 thousand in equity securities that do not have readily determinable fair values, and $1.4 million

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Nature Of Operations	Nature of Operations Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 316 branch and ATM locations throughout Missouri, Kansas, Illinois, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, trust, and private banking services. The Company also maintains commercial banking offices in Dallas, Houston, Cincinnati, Nashville, Des Moines, Indianapolis, and Grand Rapids.
Basis Of Presentation	Basis of Presentation The Company follows accounting principles generally accepted in the United States of America (GAAP) and reporting practices applicable to the banking industry. The preparation of financial statements under GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and notes. These estimates are based on information available to management at the time the estimates are made. While the consolidated financial statements reflect management’s best estimates and judgments, actual results could differ from those estimates. The consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries (after elimination of all material intercompany balances and transactions). Certain prior year amounts have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. Management has evaluated subsequent events for potential recognition or disclosure through the date these consolidated financial statements were issued. The Company, in the normal course of business, engages in a variety of activities that involve variable interest entities (VIEs). A VIE is a legal entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. However, an enterprise is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. An enterprise that is the primary beneficiary must consolidate the VIE. The Company’s interests in VIEs are evaluated to determine if the Company is the primary beneficiary both at inception and when there is a change in circumstances that requires a reconsideration. The Company is considered to be the primary beneficiary in a rabbi trust related to a deferred compensation plan offered to certain employees. The assets and liabilities of this trust, which are included in the accompanying consolidated balance sheets, are not significant. The Company also has variable interests in certain entities in which it is not the primary beneficiary. These entities are not consolidated. These interests include affordable housing limited partnership interests, holdings in its investment portfolio of various asset and mortgage-backed bonds that are issued by securitization trusts, and managed discretionary trust assets that are not included in the accompanying consolidated balance sheets.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash In the accompanying consolidated statements of cash flows, cash and cash equivalents include “Cash and due from banks”, “Federal funds sold and short-term securities purchased under agreements to resell”, and “Interest earning deposits with banks” as segregated in the accompanying consolidated balance sheets. Restricted cash is comprised of cash collateral on deposit with another financial institution to secure interest rate swap transactions. Restricted cash is included in other assets in the consolidated balance sheets and totaled $20.3 million and $8.2 million at December 31, 2019 and 2018 , respectively. Regulations of the Federal Reserve System require cash balances to be maintained at the Federal Reserve Bank, based on certain deposit levels. The minimum reserve requirement for the Bank at December 31, 2019 totaled $160.7 million . Other interest earning cash balances held at the Federal Reserve Bank totaled $395.9 million .
Loans And Related Earnings	Loans and Related Earnings Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of undisbursed loan proceeds, the allowance for loan losses, and 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. Interest on loans is accrued based upon the principal amount outstanding. Interest income is recognized primarily on the level yield method. 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.
Non-Accrual Loans	Non-Accrual Loans Loans are placed on non-accrual status when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Business, construction real estate, business real estate, and personal real estate loans that are contractually 90 days past due as to principal and/or interest payments are generally placed on non-accrual, unless they are both well-secured and in the process of collection. Consumer, revolving home equity and credit card loans are exempt under regulatory rules from being classified as non-accrual. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed against current income, and the loan is charged off to the extent uncollectible. Principal and interest payments received on non-accrual loans are generally applied to principal. Interest is included in income only after all previous loan charge-offs have been recovered and is recorded only as received. The loan is returned to accrual status only when the borrower has brought all past due principal and interest payments current, and, in the opinion of management, the borrower has demonstrated the ability to make future payments of principal and interest as scheduled. A six month history of sustained payment performance is generally required before reinstatement of accrual status.
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 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 in the same manner as described below. Troubled debt restructurings which are performing under their contractual terms continue to accrue interest which is recognized in current earnings.
Impaired Loans	Impaired Loans Loans are evaluated regularly by management for impairment. Included in impaired loans are all non-accrual loans, as well as loans that have been classified as troubled debt restructurings. Once a loan has been identified as impaired, impairment is measured based on either the present value of the expected future cash flows at the loan’s initial effective interest rate or the fair value of the collateral if collateral dependent. Factors considered in determining impairment include delinquency status, cash flow analysis, credit analysis, and collateral value and availability.
Loans Held For Sale	Loans Held For Sale Loans held for sale include student loans and certain fixed rate residential mortgage loans. These loans are typically classified as held for sale upon origination based upon management's intent to sell the production of these loans. The student loans are carried at the lower of aggregate cost or fair value, and their fair value is determined based on sale contract prices. The mortgage loans are carried at fair value under the elected fair value option. Their fair value is based on secondary market prices for loans with similar characteristics, including an adjustment for embedded servicing value. Changes in fair value and gains and losses on sales are included in loan fees and sales. Deferred fees and costs related to these loans are not amortized but are recognized as part of the cost basis of the loan at the time it is sold. Interest income related to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate. Occasionally, other types of loans may be classified as held for sale in order to manage credit concentration. These loans are carried at the lower of cost or fair value with gains and losses on sales recognized in loan fees and sales.
Allowance/Provision For Loan Losses	Allowance/Provision for Loan Losses The allowance for loan losses is maintained at a level believed to be appropriate by management to provide for probable loan losses inherent in the portfolio as of the balance sheet date, including losses on known or anticipated problem loans as well as for loans which are not currently known to require specific allowances. Management has established a process to determine the amount of the allowance for loan losses which assesses the risks and losses inherent in its portfolio. Business, construction real estate and business real estate loans are normally larger and more complex, and their collection rates are harder to predict. These loans are more likely to be collateral dependent and are allocated a larger reserve, due to their potential volatility. Personal real estate, credit card, consumer and revolving home equity loans are individually smaller and perform in a more homogenous manner, making loss estimates more predictable. Management’s process provides an allowance consisting of a specific allowance component based on certain individually evaluated loans and a general component based on estimates of reserves needed for pools of loans. Loans subject to individual evaluation generally consist of business, construction real estate, business real estate and personal real estate loans on non-accrual status. These impaired loans are evaluated individually for the impairment of repayment potential and collateral adequacy. Other impaired loans identified as performing troubled debt restructurings are collectively evaluated because they have similar risk characteristics. Loans which have not been identified as impaired are segregated by loan type and sub-type and are collectively evaluated. Reserves calculated for these loan pools are estimated using a consistent methodology that considers historical loan loss experience by loan type, loss emergence periods, delinquencies, current economic factors, loan risk ratings and industry concentrations. The Company’s estimate of the allowance for loan losses and the corresponding provision for loan losses is based on various judgments and assumptions made by management. The amount of the allowance for loan losses is influenced by several qualitative factors which include collateral valuation, evaluation of performance and status, current loan portfolio composition and characteristics, trends in delinquencies, portfolio risk ratings, levels of non-performing assets, and prevailing regional and national economic and business conditions. The estimates, appraisals, evaluations, and cash flows utilized by management may be subject to frequent adjustments due to changing economic prospects of borrowers or properties. These estimates are reviewed periodically and adjustments, if necessary, are recorded in the provision for loan losses in the periods in which they become known. Loans, or portions of loans, are charged off to the extent deemed uncollectible. Loan charge-offs reduce the allowance for loan losses, and recoveries of loans previously charged off are added back to the allowance. Business, business real estate, construction 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 no collateral) once the loans are more than 120 days delinquent. Credit card loans are charged off against the allowance for loan losses when the receivable is more than 180 days past due. The interest and fee income previously capitalized but not collected on credit card charge-offs is reversed against interest income.
Direct Financing And Sales Type Leases	Direct Financing and Sales Type Leases The net investment in direct financing and sales type leases is included in loans on the Company’s consolidated balance sheets and consists of the present values of the sum of the future minimum lease payments and estimated residual value of the leased asset. Revenue consists of interest earned on the net investment and is recognized over the lease term as a constant percentage return thereon.
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, excluding certain losses associated with other-than-temporary impairment (OTTI), are reported in other comprehensive income (loss), a component of stockholders’ equity. Securities are periodically evaluated for OTTI in accordance with guidance provided in ASC 320-10-35. For securities with OTTI, 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 likely that it will be required to sell the security before the anticipated recovery. If neither condition is met, but the Company does not expect to recover the amortized cost basis, the Company determines whether a credit loss has occurred, and the loss is then recognized in current earnings. The noncredit-related portion of the overall loss is reported in other comprehensive income (loss). 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. Equity securities include common and preferred stock with readily determinable fair values. These are also carried at fair value. Prior to January 1, 2018, changes in fair value were recorded in other comprehensive income. The Company's adoption of ASU 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities", effective January 1, 2018, required that all subsequent changes in fair value be recorded in current earnings. The adoption also required a reclassification of the unrealized gain in fair value on equity securities (recorded in accumulated other comprehensive income at December 31, 2017) to retained earnings. The amount of this reclassification was $33.3 million , net of tax. Certain equity securities do not have readily determinable fair values. The Company has elected under ASU 2016-01 to measure these 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 investments. 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 other-than-temporary 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.
Securities Purchased Under Agreements To Resell And Securities Sold Under Agreements To Repurchase	Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions, not as purchases and sales of the underlying securities. The agreements are recorded at the amount of cash advanced or received. The Company periodically enters into securities purchased under agreements to resell with large financial institutions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian. Securities sold under agreements to repurchase are a source of funding to the Company and are offered to cash management customers as an automated, collateralized investment account. From time to time, securities sold may also be used by the Bank to obtain additional borrowed funds at favorable rates. These borrowings are secured by a portion of the Company's investment security portfolio and delivered either to the dealer custody account at the FRB or to the applicable counterparty. The fair value of collateral either received from or provided to a counterparty is monitored daily, and additional collateral is obtained, returned, or provided by the Company in order to maintain full collateralization for these transactions. As permitted by current accounting guidance, the Company offsets certain securities purchased under agreements to resell against securities sold under agreements to repurchase in its balance sheet presentation. These agreements are further discussed in Note 20, Resale and Repurchase Agreements.
Premises and Equipment	Premises and Equipment Land is stated at cost, and buildings and equipment are stated at cost, including capitalized interest when appropriate, less accumulated depreciation. Depreciation is computed using a straight-line method, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 10 years for equipment. Leasehold improvements are amortized over the shorter of 10 years or the remaining lease term. Maintenance and repairs are charged to non-interest expense as incurred. Premises and equipment also includes the Company's right-of-use leased assets, which is mainly comprised of operating leases for branches, office space, ATM locations, and certain equipment.
Foreclosed Assets	Foreclosed Assets Foreclosed assets consist of property that has been repossessed and is comprised of commercial and residential real estate and other non-real estate property, including auto and recreational and marine vehicles. The assets are initially recorded at fair value less estimated selling costs, establishing a new cost basis. Initial valuation adjustments are charged to the allowance for loan losses. Fair values are estimated primarily based on appraisals, third-party price opinions, or internally developed pricing models. After initial recognition, fair value estimates are updated periodically. Declines in fair value below cost are recognized through valuation allowances which may be reversed when supported by future increases in fair value. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill is not amortized but is assessed for impairment on an annual basis or more frequently in certain circumstances. When testing for goodwill impairment, the Company may initially perform a qualitative assessment. Based on the results of this qualitative assessment, if the Company concludes it is more likely than not that a reporting unit's fair value is less than its carrying amount, a quantitative analysis is performed. Quantitative valuation methodologies include a combination of formulas using current market multiples, based on recent sales of financial institutions within the Company's geographic marketplace. If the fair value of a reporting unit is less than the carrying amount, additional analysis is required to measure the amount of impairment. The Company has not recorded impairment resulting from goodwill impairment tests. However, adverse changes in the economic environment, operations of the reporting unit, or other factors could result in a decline in fair value. Intangible assets that have finite useful lives, such as core deposit intangibles and mortgage servicing rights, are amortized over their estimated useful lives. Core deposit intangibles are amortized over periods of 8 to 14 years, representing their estimated lives, using accelerated methods. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, considering appropriate prepayment assumptions. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate their carrying amount may not be recoverable. Impairment is indicated if the sum of the undiscounted estimated future net cash flows is less than the carrying value of the intangible asset. Mortgage servicing rights, while initially recorded at fair value, are subsequently amortized and carried at the lower of the initial capitalized amount (net of accumulated amortization), or estimated fair value. The Company evaluates its mortgage servicing rights for impairment on a quarterly basis, using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans. A valuation allowance has been established, through a charge to earnings, to the extent the amortized cost exceeds the estimated fair value. However, the Company has not recorded other-than-temporary impairment losses on either of these types of intangible assets.
Income Taxes	Income Taxes Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes are provided for temporary differences between the financial reporting bases and income tax bases of the Company’s assets and liabilities, net operating losses, and tax credit carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income when such assets and liabilities are anticipated to be settled or realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as tax expense or benefit in the period that includes the enactment date of the change. In determining the amount of deferred tax assets to recognize in the financial statements, the Company evaluates the likelihood of realizing such benefits in future periods. A valuation allowance is established if it is more likely than not that all or some portion of the deferred tax asset will not be realized. The Company recognizes interest and penalties related to income taxes within income tax expense in the consolidated statements of income. The Company and its eligible subsidiaries file a consolidated federal income tax return. State and local income tax returns are filed on a combined, consolidated or separate return basis based upon each jurisdiction’s laws and regulations. In December 2017, tax reform legislation was enacted that changed the maximum corporate tax rate for years 2018 and beyond. As such, deferred tax assets and liabilities were revalued in 2017 to account for the change in future tax rates. Additional information about current and deferred income taxes is provided in Note 9, Income Taxes.
Non-Interest Income	Non-Interest Income Non-interest income is mainly comprised of revenue from contracts with customers. For that revenue (excluding certain revenue associated with financial instruments, derivative and hedging instruments, guarantees, lease contracts, transferring and servicing of financial assets, and other specific revenue transactions), the Company applies the following five-step approach when recognizing revenue: (i) identify the contract with the customer, (ii) identify the performance obligations, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations, and (v) recognize revenue when (or as) the performance obligation is satisfied. The Company’s contracts with customers are generally short term in nature, with a duration of one year or less, and most contracts are cancellable by either the Company or its customer without penalty. Performance obligations for customer contracts are generally satisfied at a single point in time, typically when the transaction is complete and the customer has received the goods or service, or over time. For performance obligations satisfied over time, the Company recognizes the value of the goods or services transferred to the customer when the performance obligations have been transferred and received by the customer. Payments for satisfied performance obligations are typically due when or as the goods or services are completed, or shortly thereafter, which usually occurs within a single financial reporting period. In situations where payment is made before the performance obligation is satisfied, the fees are deferred until the performance obligations pertaining to those goods or services are completed. In cases where payment has not been received despite satisfaction of its performance obligations, the Company accrues an estimate of the amount due in the period that the performance obligations have been satisfied. For contracts with variable components, the Company only recognizes revenue to the extent that it is probable that the cumulative amount recognized will not be subject to a significant reversal in future periods. Generally, the Company’s contracts do not include terms that require significant judgment to determine whether a variable component is included within the transaction price. The Company generally acts in a principal capacity, on its own behalf, in most of its contracts with customers. For these transactions, revenue and the related costs to provide the goods or services are presented on a gross basis in the financial statements. In some cases, the Company acts in an agent capacity, deriving revenue through assisting third parties in transactions with the Company’s customers. In such transactions, revenue and the related costs to provide services is presented on a net basis in the financial statements. These transactions primarily relate to fees earned from bank card and related network and rewards costs and the sales of annuities and certain limited insurance products.
Derivatives	Derivatives Most of the Company's derivative contracts are accounted for as free-standing instruments. These instruments are carried at fair value, and changes in fair value are recognized in current earnings. They include interest rate swaps and caps, which are offered to customers to assist in managing their risks of adverse changes in interest rates. Each contract between the Company and a customer is offset by a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company also enters into certain contracts, known as credit risk participation agreements, to buy or sell credit protection on specific interest rate swaps. It also purchases and sells forward foreign exchange contracts, either in connection with customer transactions, or for its own trading purposes. In 2015, the Company began an origination and sales program of certain personal real estate mortgages. Derivative instruments under this program include mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities. The Company's interest rate risk management policy permits the use of hedge accounting for derivatives, and the Company has entered into interest rate floor contracts as protection from the potential for declining interest rates in the commercial loan portfolio. These floors were designated and qualified as cash flow hedges. In a cash flow hedge, the changes in fair value are recorded in accumulated other comprehensive income and recognized in the income statement when the hedged cash flows affect earnings. Both at hedge inception and on an ongoing basis, the Company assesses whether the interest rate floors used in the hedging relationships are highly effective in offsetting changes in the cash flows of the hedged items. The Company has master netting arrangements with various counterparties but does not offset derivative assets and liabilities under these arrangements in its consolidated balance sheets. However, interest rate swaps that are executed under central clearing requirements are presented net of variation margin as mandated by the statutory terms of the Company's contract with its clearing counterparty.
Pension Plan	Pension Plan The Company’s pension plan is described in Note 10, Employee Benefit Plans. Historically, the Company has reported all components of net periodic pension cost in salaries and employee benefits in its consolidated statements of income. Upon the adoption of ASU 2017-07 "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost", in 2018, only the service cost component of net periodic pension cost is reported in salaries and employee benefits in the accompanying consolidated statements of income, while the other components are reported in other non-interest expense. The funded status of the plan is recognized as an asset or liability in the consolidated balance sheets, and changes in that funded status are recognized in the year in which the changes occur through other comprehensive income. Plan assets and benefit obligations are measured as of the fiscal year end of the plan. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated.
Stock-Based Compensation	Stock-Based Compensation The Company’s stock-based employee compensation plan is described in Note 11, Stock-Based Compensation and Directors Stock Purchase Plan. In accordance with the requirements of ASC 718-10-30-3 and 35-2, the Company measures the cost of stock-based compensation based on the grant-date fair value of the award, recognizing the cost over the requisite service period, which is generally the vesting period. The fair value of an option award is estimated using the Black-Scholes option-pricing model while the fair value of a nonvested stock award is the common stock (CBSH) market price. The expense recognized for stock-based compensation is included in salaries and benefits in the accompanying consolidated statements of income. The Company recognizes forfeitures as a reduction to expense only when they have occurred.
Treasury Stock	Treasury Stock Purchases of the Company’s common stock are recorded at cost. Upon re-issuance for acquisitions, exercises of stock-based awards or other corporate purposes, treasury stock is reduced based upon the average cost basis of shares held.
Income Per Share	Income per Share Basic income per share is computed using the weighted average number of common shares outstanding during each year. Diluted income per share includes the effect of all dilutive potential common shares (primarily stock appreciation rights) outstanding during each year. The Company applies the two-class method of computing income per share. The two-class method is an earnings allocation formula that determines income per share for common stock and for participating securities, according to dividends declared and participation rights in undistributed earnings. The Company’s nonvested stock awards are considered to be a class of participating security. All per share data has been restated to reflect the 5% stock dividend distributed in December 2019 .

Loans And Allowance For Loan _2

Loans And Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2019
Loans And Allowance For Loan Losses [Abstract]
Summary Classification Of Held To Maturity Loan Portfolio	Major classifications within the Company’s held for investment loan portfolio at December 31, 2019 and 2018 are as follows: (In thousands) 2019 2018 Commercial: Business $ 5,565,449 $ 5,106,427 Real estate — construction and land 899,377 869,659 Real estate — business 2,833,554 2,875,788 Personal Banking: Real estate — personal 2,354,760 2,127,083 Consumer 1,964,145 1,955,572 Revolving home equity 349,251 376,399 Consumer credit card 764,977 814,134 Overdrafts 6,304 15,236 Total loans $ 14,737,817 $ 14,140,298
Loans To Directors And Executive Officers	Loans to directors and executive officers of the Parent and the Bank, and to their affiliates, are summarized as follows: (In thousands) Balance at January 1, 2019 $ 46,728 Additions 133,607 Amounts collected (123,956 ) Amounts written off — Balance, December 31, 2019 $ 56,379
Summary Of Activity In The Allowance For Loan Losses	A summary of the activity in the allowance for losses during the previous three years follows: (In thousands) Commercial Personal Banking Total Balance at December 31, 2016 $ 91,361 $ 64,571 $ 155,932 Provision for loan losses 2,327 42,917 45,244 Deductions: Loans charged off 2,538 52,641 55,179 Less recoveries 2,554 10,981 13,535 Net loans charged off (recoveries) (16 ) 41,660 41,644 Balance at December 31, 2017 93,704 65,828 159,532 Provision for loan losses 254 42,440 42,694 Deductions: Loans charged off 3,164 52,657 55,821 Less recoveries 2,075 11,452 13,527 Net loans charged off 1,089 41,205 42,294 Balance at December 31, 2018 92,869 67,063 159,932 Provision for loan losses 2,816 47,622 50,438 Deductions: Loans charged off 4,711 57,169 61,880 Less recoveries 786 11,406 12,192 Net loans charged off 3,925 45,763 49,688 Balance at December 31, 2019 $ 91,760 $ 68,922 $ 160,682
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 and 2018 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under 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 December 31, 2018 Commercial $ 1,780 $ 61,496 $ 91,089 $ 8,790,378 Personal Banking 916 17,120 66,147 5,271,304 Total $ 2,696 $ 78,616 $ 157,236 $ 14,061,682
Investment In Impaired Loans	(In thousands) 2019 2018 Non-accrual loans $ 10,220 $ 12,536 Restructured loans (accruing) 71,512 66,080 Total impaired loans $ 81,732 $ 78,616
Additional Information About Impaired Loans Held	The following table provides additional information about impaired loans held by the Company at December 31, 2019 and 2018 , 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 December 31, 2018 With no related allowance recorded: Business $ 8,725 $ 14,477 $ — $ 8,725 $ 14,477 $ — With an allowance recorded: Business $ 40,286 $ 40,582 $ 1,223 Real estate – construction and land 416 421 11 Real estate – business 12,069 12,699 546 Real estate – personal 4,461 6,236 266 Consumer 5,510 5,510 38 Revolving home equity 40 40 1 Consumer credit card 7,109 7,109 611 $ 69,891 $ 72,597 $ 2,696 Total $ 78,616 $ 87,074 $ 2,696
Total Average Impaired Loans	Total average impaired loans during 2019 and 2018 are shown in the table below. 2019 2018 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Average impaired loans: Non-accrual loans $ 9,892 $ 2,031 $ 11,923 $ 7,619 $ 2,122 $ 9,741 Restructured loans (accruing) 49,544 15,667 65,211 73,261 16,526 89,787 Total $ 59,436 $ 17,698 $ 77,134 $ 80,880 $ 18,648 $ 99,528
Interest Income Recognized On Impaired Loans	The table below shows interest income recognized during the years ended December 31, 2019 , 2018 and 2017 for impaired loans held at the end of each respective period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section below. Years Ended December 31 (In thousands) 2019 2018 2017 Interest income recognized on impaired loans: Business $ 1,329 $ 2,219 $ 3,135 Real estate – construction and land 2 25 41 Real estate – business 1,456 558 514 Real estate – personal 136 139 402 Consumer 286 305 307 Revolving home equity 3 3 10 Consumer credit card 828 746 673 Total $ 4,040 $ 3,995 $ 5,082
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 December 31, 2019 and 2018 . (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 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 December 31, 2018 Commercial: Business $ 5,086,912 $ 10,057 $ 473 $ 8,985 $ 5,106,427 Real estate – construction and land 867,692 1,963 — 4 869,659 Real estate – business 2,867,347 6,704 22 1,715 2,875,788 Personal Banking: Real estate – personal 2,118,045 6,041 1,165 1,832 2,127,083 Consumer 1,916,320 35,608 3,644 — 1,955,572 Revolving home equity 374,830 875 694 — 376,399 Consumer credit card 792,334 11,140 10,660 — 814,134 Overdrafts 14,937 299 — — 15,236 Total $ 14,038,417 $ 72,687 $ 16,658 $ 12,536 $ 14,140,298
Credit Quality Of Commercial Loan Portfolio	The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. 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 material 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. 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 December 31, 2018 Pass $ 4,915,042 $ 866,527 $ 2,777,374 $ 8,558,943 Special mention 84,391 1,917 51,845 138,153 Substandard 98,009 1,211 44,854 144,074 Non-accrual 8,985 4 1,715 10,704 Total $ 5,106,427 $ 869,659 $ 2,875,788 $ 8,851,874
Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding	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 "Delinquent and non-accrual loans" . 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. 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 $198.2 million at December 31, 2019 and $201.7 million at December 31, 2018 . The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $199.2 million at December 31, 2019 and $170.3 million at December 31, 2018 . 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 8% 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 December 31, 2019 and 2018 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card 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 % December 31, 2018 FICO score: Under 600 1.1 % 3.1 % 0.8 % 4.4 % 600 – 659 1.8 4.8 1.7 14.0 660 – 719 9.4 16.1 9.1 34.8 720 – 779 24.7 25.7 24.0 26.4 780 and over 63.0 50.3 64.4 20.4 Total 100.0 % 100.0 % 100.0 % 100.0 %
Additional Information about Troubled Debt Restructurings [Table Text Block]	December 31 (In thousands) 2019 2018 Accruing loans: Commercial $ 55,934 $ 50,904 Assistance programs 8,365 7,410 Consumer bankruptcy 3,592 4,103 Other consumer 3,621 3,663 Non-accrual loans 7,938 9,759 Total troubled debt restructurings $ 79,450 $ 75,839
Outstanding Balance Of Loans Classified As Troubled Debt Restructurings	The table below shows the balance of troubled debt restructurings by loan classification at December 31, 2019 , 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) December 31, 2019 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 37,055 $ — Real estate – construction and land 44 — Real estate – business 25,933 — Personal Banking: Real estate – personal 3,915 347 Consumer 4,421 83 Revolving home equity 35 — Consumer credit card 8,047 987 Total troubled debt restructurings $ 79,450 $ 1,417

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities, At Fair Value	Investment securities, at fair value, consisted of the following at December 31, 2019 and 2018 : 2019 2018 Available for sale debt securities $ 8,571,626 $ 8,538,041 Trading debt securities 28,161 27,059 Equity securities: Readily determinable fair value 2,929 2,585 No readily determinable fair value 1,280 1,824 Other: Federal Reserve Bank stock 33,770 33,498 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 94,122 85,659 Total investment securities $ 8,741,888 $ 8,698,666
Summary Of Available For Sale Investment Securities By Maturity Groupings	(Dollars in thousands) Amortized Cost Fair Value Weighted Average Yield U.S. government and federal agency obligations: Within 1 year $ 57,234 $ 57,192 (.01 )*% After 1 but within 5 years 518,035 533,805 2.17 * After 5 but within 10 years 252,592 260,779 .59 * Total U.S. government and federal agency obligations 827,861 851,776 1.54 * Government-sponsored enterprise obligations: Within 1 year 81,616 81,830 1.99 After 10 years 57,118 57,447 2.65 Total government-sponsored enterprise obligations 138,734 139,277 2.26 State and municipal obligations: Within 1 year 51,230 51,540 2.55 After 1 but within 5 years 740,283 763,396 2.42 After 5 but within 10 years 377,009 395,014 2.56 After 10 years 57,010 57,977 2.92 Total state and municipal obligations 1,225,532 1,267,927 2.49 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,893,247 3,937,964 2.87 Non-agency mortgage-backed securities 796,451 809,782 2.98 Asset-backed securities 1,228,151 1,233,489 2.61 Total mortgage and asset-backed securities 5,917,849 5,981,235 2.83 Other debt securities: Within 1 year 51,998 52,180 After 1 but within 5 years 218,950 222,770 After 5 but within 10 years 54,607 56,461 Total other debt securities 325,555 331,411 Total available for sale debt securities $ 8,435,531 $ 8,571,626
Available For Sale Securities Unrealized Gains And Losses By Security Type	For debt securities classified as available for sale, the following table shows the 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 December 31, 2018 U.S. government and federal agency obligations $ 914,486 $ 4,545 $ (11,379 ) $ 907,652 Government-sponsored enterprise obligations 199,470 55 (3,747 ) 195,778 State and municipal obligations 1,322,785 10,284 (5,030 ) 1,328,039 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,253,433 9,820 (48,268 ) 3,214,985 Non-agency mortgage-backed securities 1,053,854 6,641 (12,779 ) 1,047,716 Asset-backed securities 1,518,976 3,849 (11,211 ) 1,511,614 Total mortgage and asset-backed securities 5,826,263 20,310 (72,258 ) 5,774,315 Other debt securities 339,595 72 (7,410 ) 332,257 Total $ 8,602,599 $ 35,266 $ (99,824 ) $ 8,538,041
Cash Flow Model Inputs Used To Calculate Credit Losses	The credit-related portion of the loss on these securities was based on the 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. Significant inputs to the cash flow models used to calculate the credit losses on these securities at December 31, 2019 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 9% - 52% Credit support 0% - 20% Loss severity 8% - 63%
Changes In Recorded Credit Losses	The following table presents a rollforward of the cumulative OTTI credit losses recognized in earnings on all available for sale debt securities. (In thousands) 2019 2018 2017 Cumulative OTTI credit losses at January 1 $ 14,092 $ 14,199 $ 14,080 Credit losses on debt securities for which impairment was not previously recognized 48 58 111 Credit losses on debt securities for which impairment was previously recognized 85 10 274 Increase in expected cash flows that are recognized over remaining life of security (950 ) (175 ) (266 ) Cumulative OTTI credit losses at December 31 $ 13,275 $ 14,092 $ 14,199
Securities With Unrealized Losses And Length Of Impairment Period	Debt securities with unrealized losses recorded in AOCI are shown in the table below, along with the length of the 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 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 December 31, 2018 U.S. government and federal agency obligations $ 317,699 $ 6,515 $ 116,728 $ 4,864 $ 434,427 $ 11,379 Government-sponsored enterprise obligations — — 188,846 3,747 188,846 3,747 State and municipal obligations 157,838 704 257,051 4,326 414,889 5,030 Mortgage and asset-backed securities: Agency mortgage-backed securities 330,933 1,502 1,927,268 46,766 2,258,201 48,268 Non-agency mortgage-backed securities 207,506 1,085 657,685 11,694 865,191 12,779 Asset-backed securities 147,997 728 813,427 10,483 961,424 11,211 Total mortgage and asset-backed securities 686,436 3,315 3,398,380 68,943 4,084,816 72,258 Other debt securities 51,836 564 260,682 6,846 312,518 7,410 Total $ 1,213,809 $ 11,098 $ 4,221,687 $ 88,726 $ 5,435,496 $ 99,824
Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses	The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Year Ended December 31 (In thousands) 2019 2018 2017 Proceeds from sales of securities: Available for sale debt securities $ 402,103 $ 667,227 $ 779,793 Equity securities 3,856 41,637 10,953 Other 7,244 — 1,634 Total proceeds $ 413,203 $ 708,864 $ 792,380 Investment securities gains (losses), net: Available for sale debt securities: Losses realized on called bonds $ — $ — $ (254 ) Gains realized on sales 2,354 448 592 Losses realized on sales (2,568 ) (10,101 ) (10,287 ) Other-than-temporary impairment recognized on debt securities (133 ) (68 ) (385 ) Equity securities: Gains realized on donations of securities — — 31,074 Gains realized on sales 3,262 1,759 10,653 Losses realized on sales — (8,917 ) (10 ) Fair value adjustments, net 344 2,542 — Other: Gains realized on sales 1,094 — 381 Losses realized on sales — — (880 ) Fair value adjustments, net (727 ) 13,849 (5,833 ) Total investment securities gains (losses), net $ 3,626 $ (488 ) $ 25,051

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule Of Land, Buildings And Equipment	Premises and equipment consist of the following at December 31, 2019 and 2018 : (In thousands) 2019 2018 Land $ 91,678 $ 91,603 Buildings and improvements 566,177 545,510 Equipment 237,047 226,666 Right of use leased assets 28,195 — Total 923,097 863,779 Less accumulated depreciation 552,460 530,660 Net premises and equipment $ 370,637 $ 333,119

Goodwill And Other Intangible_2

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
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. December 31, 2019 December 31, 2018 ( 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 $ (29,485 ) $ — $ 1,785 $ 31,270 $ (28,954 ) $ — $ 2,316 Mortgage servicing rights 12,942 (4,866 ) (327 ) 7,749 10,339 (3,861 ) — 6,478 Total $ 44,212 $ (34,351 ) $ (327 ) $ 9,534 $ 41,609 $ (32,815 ) $ — $ 8,794
Schedule Of Goodwill Allocated By Operating Segments	The carrying amount of goodwill and its allocation among segments at December 31, 2019 and 2018 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2019 , 2018 or 2017 . Further, the annual assessment of qualitative factors on January 1, 2020 revealed no likelihood of impairment as of that date. (In thousands) December 31, 2019 December 31, 2018 Consumer segment $ 70,721 $ 70,721 Commercial segment 67,454 67,454 Wealth segment 746 746 Total goodwill $ 138,921 $ 138,921
Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets	Changes in the net carrying amount of goodwill and other net intangible assets for the years ended December 31, 2019 and 2018 are shown in the following table. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance at December 31, 2017 $ 138,921 $ 2,965 $ 4,653 Originations — — 2,433 Amortization — (649 ) (617 ) Impairment reversal — — 9 Balance at December 31, 2018 138,921 2,316 6,478 Originations — — 2,603 Amortization — (531 ) (1,005 ) Impairment — — (327 ) Balance at December 31, 2019 $ 138,921 $ 1,785 $ 7,749
Schedule of Estimated Annual Amortization Expense	The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of December 31, 2019 . 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 $ 1,507 2021 1,286 2022 1,099 2023 919 2024 770

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The maturities of operating leases are included in the table below. (in thousands) Operating Leases (1) 2020 $ 5,913 2021 5,001 2022 4,304 2023 3,802 2024 2,530 After 2024 12,600 Total lease payments $ 34,150 Less: Interest (2) 7,126 Present value of lease liabilities $ 27,024 (1) Excludes $6.5 million of legally binding minimum lease payments for operating leases signed but not yet commenced. (2) Calculated using the interest rate for each lease.
Lease, Cost [Table Text Block]	The following table presents the average lease term and discount rate of operating leases. December 31, 2019 Weighted-average remaining lease term 11.7 years Weighted-average discount rate 3.67 %
Schedule of Supplemental Cash Flow Information Related to Operating Leases [Table Text Block]	Supplemental cash flow information related to operating leases is included in the table below. For the Year Ended December 31 (in thousands) 2019 Operating cash paid toward lease liabilities $ 5,989 Leased assets obtained in exchange for new lease liabilities $ 3,958
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]		Future minimum lease payments as of December 31, 2018 are shown below, which include leases that have not yet commenced. (in thousands) Year Ended December 31 Total 2019 $ 5,763 2020 4,817 2021 4,055 2022 3,598 2023 3,273 After 15,161 Total minimum lease payments $ 36,667
Components of Lease Income [Table Text Block]	The following table provides the components of lease income. For the Year Ended December 31 (in thousands) 2019 Direct financing and sales-type leases 24,062 Operating leases (1) 7,951 Total lease income $ 32,013 (1) Includes rent of $75 thousand from Tower Properties Company, a related party.
Net Investment in Sales-type and Direct Financing Leases [Table Text Block]	The following table presents the components of the net investments in direct financing and sales-type leases. (in thousands) December 31, 2019 Lease payment receivable $ 738,809 Unguaranteed residual assets 53,408 Total net investments in direct financing and sales-type leases $ 792,217 Deferred origination cost 3,609 Total net investment included within business loans $ 795,826
Schedule of Maturity of Lease Receivables [Table Text Block]	The maturities of lease receivables are included in the table below. (in thousands) Direct Financing and Sale-Type Leases Operating Leases Total 2020 $ 224,297 $ 7,564 $ 231,861 2021 177,143 7,511 184,654 2022 136,787 13,816 150,603 2023 92,813 5,536 98,349 2024 58,773 4,811 63,584 After 2024 114,188 8,643 122,831 Total lease receipts 804,001 $ 47,881 $ 851,882 Less: Net present value adjustment 65,192 Present value of lease receipts $ 738,809

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Scheduled Maturities Of Total Time Open And Certificates Of Deposit	At December 31, 2019 , the scheduled maturities of certificates of deposit were as follows: (In thousands) Due in 2020 $ 1,727,042 Due in 2021 229,487 Due in 2022 27,205 Due in 2023 14,387 Due in 2024 9,838 Thereafter 53 Total $ 2,008,012
Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category	The following table shows a detailed breakdown of the maturities of certificates of deposit, by size category, at December 31, 2019 . (In thousands) Certificates of Deposit under $100,000 Certificates of Deposit over $100,000 Total Due in 3 months or less $ 117,635 $ 632,064 $ 749,699 Due in over 3 through 6 months 144,309 286,240 430,549 Due in over 6 through 12 months 223,756 323,038 546,794 Due in over 12 months 140,457 140,513 280,970 Total $ 626,157 $ 1,381,855 $ 2,008,012

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Short-Term Borrowings	The following table sets forth selected information for federal funds purchased and repurchase agreements. (Dollars in thousands) Year End Weighted Rate Average Weighted Rate Average Balance Outstanding Maximum Outstanding at any Month End Balance at December 31 Federal funds purchased and repurchase agreements: 2019 .8 % 1.6 % $ 1,822,098 $ 2,394,294 $ 1,850,772 2018 .9 1.3 1,514,144 1,981,761 1,956,389 2017 .8 .7 1,462,387 1,984,071 1,507,138

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule Of Components Of Income Tax Expense (Benefit)	The components of income tax expense from operations for the years ended December 31, 2019 , 2018 and 2017 were as follows: (In thousands) Current Deferred Total Year ended December 31, 2019: U.S. federal $ 82,556 $ 11,388 $ 93,944 State and local 12,323 2,807 15,130 Total $ 94,879 $ 14,195 $ 109,074 Year ended December 31, 2018: U.S. federal $ 90,390 $ 3,220 $ 93,610 State and local 10,223 2,116 12,339 Total $ 100,613 $ 5,336 $ 105,949 Year ended December 31, 2017: U.S. federal $ 89,154 $ 12,190 $ 101,344 State and local 7,735 1,427 9,162 Total $ 96,889 $ 13,617 $ 110,506
Schedule Of Income Tax Expense Recorded Directly To Stockholders Equity	The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2019 , 2018 and 2017 were as follows: (In thousands) 2019 2018 2017 Unrealized gain (loss) on available for sale debt securities $ 50,163 $ (18,634 ) $ 2,104 Change in fair value on cash flow hedges 7,818 2,286 — Accumulated pension (benefit) loss 389 222 (184 ) Income tax (benefit) expense allocated to stockholders’ equity $ 58,370 $ (16,126 ) $ 1,920
Components Of Deferred Tax Assets And Liabilities	Significant components of the Company’s deferred tax assets and liabilities at December 31, 2019 and 2018 were as follows: (In thousands) 2019 2018 Deferred tax assets: Loans, principally due to allowance for loan losses $ 39,130 $ 39,169 Unrealized loss on available for sale debt securities — 16,140 Equity-based compensation 7,554 7,609 Deferred compensation 6,662 5,911 Unearned fee income 5,053 4,125 Accrued expenses 4,270 2,152 Other 4,057 4,640 Total deferred tax assets 66,726 79,746 Deferred tax liabilities: Equipment lease financing 68,814 55,738 Unrealized gain on available for sale debt securities 34,024 — Land, buildings and equipment 17,202 14,207 Cash flow hedges 9,015 2,104 Intangibles 6,491 5,973 Other 7,331 5,309 Total deferred tax liabilities 142,877 83,331 Net deferred tax liabilities $ (76,151 ) $ (3,585 )
Schedule Of Company's Actual Income Tax Expense	A reconciliation between the expected federal income tax expense using the federal statutory tax rate and the Company's actual income tax expense is provided below. The federal statutory tax rate was 21% in 2019 and 2018, and 35% in 2017. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense. (In thousands) 2019 2018 2017 Computed “expected” tax expense $ 111,364 $ 113,293 $ 150,461 Increase (decrease) in income taxes resulting from: Tax-exempt interest, net of cost to carry (10,973 ) (11,502 ) (20,295 ) Contribution of appreciated securities — — (10,864 ) State and local income taxes, net of federal tax benefit 11,953 9,748 5,955 Tax reform enactment — — (6,753 ) Share-based award payments (3,337 ) (3,928 ) (6,613 ) Other 67 (1,662 ) (1,385 ) Total income tax expense $ 109,074 $ 105,949 $ 110,506
Schedule Of Accrued Liability For Unrecognized Tax Benefit	The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2019 and 2018 was as follows: (In thousands) 2019 2018 Unrecognized tax benefits at beginning of year $ 1,257 $ 1,208 Gross increases – tax positions in prior period 18 31 Gross decreases – tax positions in prior period (4 ) — Gross increases – current-period tax positions 361 322 Lapse of statute of limitations (260 ) (304 ) Unrecognized tax benefits at end of year $ 1,372 $ 1,257 The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2016 through 2019 remain open to examination for U.S. federal income tax and for major state taxing jurisdictions.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Defined Benefit Plan [Abstract]
Employee Benefits Charged To Operating Expenses	Employee benefits charged to operating expenses are summarized in the table below. Substantially all of the Company’s employees are covered by a defined contribution (401(k)) plan, under which the Company makes matching contributions. (In thousands) 2019 2018 2017 Payroll taxes $ 26,959 $ 25,712 $ 24,402 Medical plans 29,635 27,030 25,143 401(k) plan 15,810 14,986 14,244 Pension plans 605 651 704 Other 3,049 2,918 2,883 Total employee benefits $ 76,058 $ 71,297 $ 67,376
Components Of The Net Pension Cost	The following items are components of the net pension cost for the years ended December 31, 2019 , 2018 and 2017 . (In thousands) 2019 2018 2017 Service cost-benefits earned during the year $ 607 $ 651 $ 621 Interest cost on projected benefit obligation 4,198 3,756 3,826 Expected return on plan assets (4,842 ) (5,255 ) (5,785 ) Amortization of prior service cost (271 ) (271 ) (271 ) Amortization of unrecognized net loss 2,288 2,267 2,313 Net periodic pension cost $ 1,980 $ 1,148 $ 704
Summary Of Pension Plans Funded Status	The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2019 and 2018 . (In thousands ) 2019 2018 Change in projected benefit obligation Projected benefit obligation at prior valuation date $ 112,063 $ 120,667 Service cost 607 651 Interest cost 4,198 3,756 Benefits paid (7,016 ) (6,622 ) Actuarial (gain) loss 10,750 (6,389 ) Projected benefit obligation at valuation date 120,602 112,063 Change in plan assets Fair value of plan assets at prior valuation date 99,418 108,260 Actual return on plan assets 15,129 (2,244 ) Employer contributions 25 24 Benefits paid (7,016 ) (6,622 ) Fair value of plan assets at valuation date 107,556 99,418 Funded status and net amount recognized at valuation date $ (13,046 ) $ (12,645 )
Schedule Of Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss), Pre-Tax Basis	Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2019 and 2018 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis. (In thousands) 2019 2018 Prior service cost $ 1,265 $ 1,535 Accumulated loss (30,516 ) (32,342 ) Accumulated other comprehensive loss (29,251 ) (30,807 ) Cumulative employer contributions in excess of net periodic benefit cost 16,205 18,162 Net amount recognized as an accrued benefit liability on the December 31 balance sheet $ (13,046 ) $ (12,645 ) Net loss arising during period (461 ) (1,110 ) Amortization of net loss 2,288 2,267 Amortization of prior service cost (271 ) (271 ) Total recognized in other comprehensive income $ 1,556 $ 886 Total expense recognized in net periodic pension cost and other comprehensive income $ (424 ) $ (262 )
Assumptions On A Weighted Average Basis, Used In Accounting For Plans	The following assumptions, on a weighted average basis, were used in accounting for the plans. 2019 2018 2017 Determination of benefit obligation at year end: Effective discount rate for benefit obligations 3.07 % 4.14 % 3.57 % Assumed credit on cash balance accounts 5.00 % 5.00 % 5.00 % Determination of net periodic benefit cost for year ended: Effective discount rate for benefit obligations 4.13 % 3.57 % 3.95 % Effective rate for interest on benefit obligations 3.81 % 3.28 % 3.28 % Long-term rate of return on assets 5.00 % 5.00 % 6.00 % Assumed credit on cash balance accounts 5.00 % 5.00 % 5.00 %
Fair Value Of Pension Plan Asset Category	The following table shows the fair values of the Company’s pension plan assets by asset category at December 31, 2019 and 2018 . Information about the valuation techniques and inputs used to measure fair value are provided in Note 17 on Fair Value Measurements. Fair Value Measurements (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) December 31, 2019 Assets: U.S. government obligations $ 4,746 $ 4,746 $ — $ — Government-sponsored enterprise obligations (a) 1,302 — 1,302 — State and municipal obligations 8,612 — 8,612 — Agency mortgage-backed securities (b) 8,892 — 8,892 — Non-agency mortgage-backed securities 3,919 — 3,919 — Asset-backed securities 5,093 — 5,093 — Corporate bonds (c) 39,663 — 39,663 — Equity securities and mutual funds: (d) Mutual funds 6,315 6,315 — — Common stocks 22,552 22,552 — — International developed markets funds 4,674 4,674 — — Emerging markets funds 1,788 1,788 — — Total $ 107,556 $ 40,075 $ 67,481 $ — December 31, 2018 Assets: U.S. government obligations $ 2,994 $ 2,994 $ — $ — Government-sponsored enterprise obligations (a) 1,200 — 1,200 — State and municipal obligations 8,299 — 8,299 — Agency mortgage-backed securities (b) 8,209 — 8,209 — Non-agency mortgage-backed securities 4,398 — 4,398 — Asset-backed securities 3,520 — 3,520 — Corporate bonds (c) 37,207 — 37,207 — Equity securities and mutual funds: (d) Mutual funds 8,645 8,645 — — Common stocks 18,173 18,173 — — International developed markets funds 5,046 5,046 — — Emerging markets funds 1,727 1,727 — — Total $ 99,418 $ 36,585 $ 62,833 $ — (a) This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association. (b) This category represents mortgage-backed securities issued by the agencies mentioned in (a). (c) This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries. (d)
Future Benefit Payments	The following future benefit payments are expected to be paid: (In thousands) 2020 $ 7,281 2021 7,430 2022 7,409 2023 7,467 2024 7,371 2025 - 2029 35,721

Stock-Based Compensation and _2

Stock-Based Compensation and Directors Stock Purchase Plan (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Summary Of The Status Of Nonvested Share Awards	Nonvested Restricted Stock Awards Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are 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 of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2019 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2019 1,239,970 $ 41.18 Granted 217,182 58.82 Vested (339,618 ) 31.33 Forfeited (13,323 ) 47.41 Nonvested at December 31, 2019 1,104,211 $ 47.57
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]	2019 2018 2017 Weighted per share average fair value at grant date $11.35 $11.28 $10.83 Assumptions: Dividend yield 1.7 % 1.6 % 1.6 % Volatility 19.8 % 20.6 % 21.1 % Risk-free interest rate 2.6 % 2.7 % 2.4 % Expected term 6.0 years 6.6 years 7.0 years
Summary Of SAR Activity	( Dollars in thousands, except per share data) Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2019 1,119,405 $ 38.30 Granted 196,129 58.82 Forfeited (5,935 ) 49.67 Expired (1,917 ) 37.00 Exercised (257,866 ) 32.30 Outstanding at December 31, 2019 1,049,816 $ 43.55 6.6 years $ 25,601 Exercisable at December 31, 2019 557,763 $ 36.16 5.3 years $ 17,728
Schedule Of Additional Information About Stock Options and SARs Exercises	Additional information about stock options and SARs exercised is presented below. (In thousands) 2019 2018 2017 Intrinsic value of options and SARs exercised $ 7,109 $ 9,632 $ 9,310 Tax benefit realized from options and SARs exercised $ 1,385 $ 1,928 $ 2,698

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components Of Accumulated Other Comprehensive Income (Loss)	Unrealized Gains (Losses) on Securities (1) Pension Loss Unrealized Gains on Cash Flow Hedge Derivatives (2) Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 2019 $ 3,861 $ (52,278 ) $ (23,107 ) $ 6,855 $ (64,669 ) Other comprehensive income (loss) before reclassifications (975 ) 201,280 (461 ) 27,481 227,325 Amounts reclassified from accumulated other comprehensive income 133 215 2,017 3,793 6,158 Current period other comprehensive income (loss), before tax (842 ) 201,495 1,556 31,274 233,483 Income tax (expense) benefit 210 (50,373 ) (389 ) (7,818 ) (58,370 ) Current period other comprehensive income (loss), net of tax (632 ) 151,122 1,167 23,456 175,113 Transfer of unrealized gain on securities for which impairment was not previously recognized 35 (35 ) — — — Balance December 31, 2019 $ 3,264 $ 98,809 $ (21,940 ) $ 30,311 $ 110,444 Balance January 1, 2018 $ 3,411 $ 30,326 $ (19,629 ) $ — $ 14,108 ASU 2018-02 Reclassification of tax rate change 715 6,359 (4,142 ) — 2,932 ASU 2016-01 Reclassification of unrealized gain on equity securities — (33,320 ) — — (33,320 ) Other comprehensive income (loss) before reclassifications (438 ) (73,725 ) (1,110 ) 8,381 (66,892 ) Amounts reclassified from accumulated other comprehensive income 68 (447 ) 1,996 760 2,377 Current period other comprehensive income (loss), before tax (370 ) (74,172 ) 886 9,141 (64,515 ) Income tax (expense) benefit 93 18,541 (222 ) (2,286 ) 16,126 Current period other comprehensive income (loss), net of tax (277 ) (55,631 ) 664 6,855 (48,389 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 12 (12 ) — — — Balance December 31, 2018 $ 3,861 $ (52,278 ) $ (23,107 ) $ 6,855 $ (64,669 ) (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. The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income", which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (loss) (as shown in the table above) to retained earnings. New accounting guidance, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income (loss) to retained earnings (also shown above).

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Schedule Of Financial Information By Segment	Segment Income Statement Data (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Year ended December 31, 2019: Net interest income $ 315,782 $ 342,736 $ 48,058 $ 706,576 $ 114,717 $ 821,293 Provision for loan losses (44,987 ) (4,204 ) (174 ) (49,365 ) (1,073 ) (50,438 ) Non-interest income 135,257 203,952 183,589 522,798 1,905 524,703 Investment securities gains, net — — — — 3,626 3,626 Non-interest expense (297,581 ) (308,686 ) (124,123 ) (730,390 ) (37,008 ) (767,398 ) Income before income taxes $ 108,471 $ 233,798 $ 107,350 $ 449,619 $ 82,167 $ 531,786 Year ended December 31, 2018: Net interest income $ 294,798 $ 344,972 $ 46,946 $ 686,716 $ 137,109 $ 823,825 Provision for loan losses (40,571 ) (1,134 ) 32 (41,673 ) (1,021 ) (42,694 ) Non-interest income 126,253 202,527 173,026 501,806 (465 ) 501,341 Investment securities losses, net — — — — (488 ) (488 ) Non-interest expense (286,181 ) (297,847 ) (123,568 ) (707,596 ) (30,225 ) (737,821 ) Income before income taxes $ 94,299 $ 248,518 $ 96,436 $ 439,253 $ 104,910 $ 544,163 Year ended December 31, 2017: Net interest income $ 276,891 $ 329,087 $ 47,264 $ 653,242 $ 80,437 $ 733,679 Provision for loan losses (40,619 ) 205 (41 ) (40,455 ) (4,789 ) (45,244 ) Non-interest income 121,362 184,577 158,175 464,114 (2,851 ) 461,263 Investment securities gains, net — — — — 25,051 25,051 Non-interest expense (274,225 ) (281,845 ) (120,461 ) (676,531 ) (67,812 ) (744,343 ) Income before income taxes $ 83,409 $ 232,024 $ 84,937 $ 400,370 $ 30,036 $ 430,406
Segment Balance Sheet Data	Segment Balance Sheet Data (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Average balances for 2019: Assets $ 2,375,326 $ 9,486,074 $ 1,288,806 $ 13,150,206 $ 12,063,319 $ 25,213,525 Loans, including held for sale 2,239,100 9,250,645 1,276,839 12,766,584 1,476,630 14,243,214 Goodwill and other intangible assets 79,055 68,109 746 147,910 — 147,910 Deposits 10,236,257 7,848,367 1,832,418 19,917,042 (7,151 ) 19,909,891 Average balances for 2018: Assets $ 2,481,060 $ 9,115,738 $ 1,243,806 $ 12,840,604 $ 11,825,631 $ 24,666,235 Loans, including held for sale 2,346,166 8,939,696 1,233,780 12,519,642 1,425,930 13,945,572 Goodwill and other intangible assets 78,062 68,300 746 147,108 — 147,108 Deposits 10,210,502 8,029,248 1,871,596 20,111,346 19,906 20,131,252

Common and Preferred Stock (Tab

Common and Preferred Stock (Tables)	12 Months Ended
	Dec. 31, 2019
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Summary Of Components Used To Calculate Basic And Diluted Income Per Share	(In thousands, except per share data) 2019 2018 2017 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 421,231 $ 433,542 $ 319,383 Less preferred stock dividends 9,000 9,000 9,000 Net income available to common shareholders 412,231 424,542 310,383 Less income allocated to nonvested restricted stock 4,019 4,558 3,848 Net income allocated to common stock $ 408,212 $ 419,984 $ 306,535 Weighted average common shares outstanding 113,784 116,352 116,375 Basic income per common share $ 3.59 $ 3.61 $ 2.63 Diluted income per common share: Net income available to common shareholders $ 412,231 $ 424,542 $ 310,383 Less income allocated to nonvested restricted stock 4,012 4,547 3,838 Net income allocated to common stock $ 408,219 $ 419,995 $ 306,545 Weighted average common shares outstanding 113,784 116,352 116,375 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 282 361 410 Weighted average diluted common shares outstanding 114,066 116,713 116,785 Diluted income per common share $ 3.58 $ 3.60 $ 2.62
Schedule Of Activity In The Outstanding Shares Of The Company's Common Stock	The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends. Years Ended December 31 (In thousands) 2019 2018 2017 Shares outstanding at January 1 111,129 106,615 101,461 Issuance of stock: Awards and sales under employee and director plans 329 416 403 5% stock dividend 5,359 5,305 5,078 Other purchases of treasury stock (4,670 ) (1,194 ) (315 ) Other (15 ) (13 ) (12 ) Shares outstanding at December 31 112,132 111,129 106,615

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule Of Capital Amounts And Ratios On Consolidated Basis	The following tables show the capital amounts and ratios for the Company (on a consolidated basis) and the Bank, together with the minimum capital adequacy and well-capitalized capital requirements, at the last two year ends. Actual Minimum Capital Adequacy Requirement Well-Capitalized Capital Requirement (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 3,052,079 15.48 % $ 1,577,105 8.00 % N.A. N.A. Commerce Bank 2,583,676 13.19 1,566,866 8.00 $ 1,958,583 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,890,322 14.66 % $ 1,182,829 6.00 % N.A. N.A. Commerce Bank 2,421,919 12.37 1,175,150 6.00 $ 1,566,866 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,745,538 13.93 % $ 887,122 4.50 % N.A. N.A. Commerce Bank 2,421,919 12.37 881,362 4.50 $ 1,273,079 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,890,322 11.38 % $ 1,015,771 4.00 % N.A. N.A. Commerce Bank 2,421,919 9.57 1,012,232 4.00 $ 1,265,290 5.00 % December 31, 2018 Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 3,022,023 15.82 % $ 1,528,317 8.00 % N.A. N.A. Commerce Bank 2,655,591 13.98 1,519,169 8.00 $ 1,898,962 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,861,016 14.98 % $ 1,146,238 6.00 % N.A. N.A. Commerce Bank 2,494,584 13.14 1,139,377 6.00 $ 1,519,169 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,716,232 14.22 % $ 859,678 4.50 % N.A. N.A. Commerce Bank 2,494,584 13.14 854,533 4.50 $ 1,234,325 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,861,016 11.52 % $ 993,564 4.00 % N.A. N.A. Commerce Bank 2,494,584 10.07 991,185 4.00 $ 1,238,981 5.00 %

Revenue from Contracts with C_2

Revenue from Contracts with Customers Revenue from Contracts with Customers (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Reclassification of Bank Card Transaction Fees [Table Text Block]	The adoption of ASU 2014-09 did not require any significant change to the Company's revenue recognition processes. However, application of the new guidance resulted in a reclassification of certain bank card related network and rewards costs, previously classified as non-interest expense, to a reduction to non-interest income in the Company’s consolidated statements of income. The reclassification had no effect on prior period net income or net income per share. The Company adopted ASU 2014-09 on a full retrospective basis, in which each prior reporting period has been presented in accordance with the new guidance. The table below shows the effect of this reclassification on bank card fee income and non-interest expense for the year ended December 31, 2017. For the year ended December 31, 2017 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 180,441 $ (25,341 ) $ 155,100 Total non-interest income 486,604 (25,341 ) 461,263 Non-interest expense: Data processing and software $ 92,246 $ (11,248 ) $ 80,998 Other 77,459 (14,093 ) 63,366 Total non-interest expense 769,684 (25,341 ) 744,343
Disaggregation of Revenue [Table Text Block]	The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. For the Year Ended December 31 (In thousands) 2019 2018 2017 Bank card transaction fees $ 167,879 $ 171,576 $ 155,100 Trust fees 155,628 147,964 135,159 Deposit account charges and other fees 95,983 94,517 90,060 Consumer brokerage services 15,804 15,807 14,630 Other non-interest income 48,597 37,440 30,128 Total non-interest income from contracts with customers 483,891 467,304 425,077 Other non-interest income (1) 40,812 34,037 36,186 Total non-interest income $ 524,703 $ 501,341 $ 461,263 (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 years ended December 31, 2019 and 2018 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) December 31, 2019 December 31, 2018 December 31, 2017 Bank card transaction fees $ 13,915 $ 13,035 $ 13,315 Trust fees 2,093 2,721 2,802 Deposit account charges and other fees 6,523 6,107 5,597 Consumer brokerage services 596 559 380
Bank Card Transaction Fees [Table Text Block]	The following table presents the components of bank card fee income. For the Years Ended December 31 (In thousands) 2019 2018 2017 Debit card: Fee income $ 42,106 $ 41,522 $ 40,134 Expense for network charges (2,081 ) (1,784 ) (4,498 ) Net debit card fees 40,025 39,738 35,636 Credit card: Fee income 27,416 26,799 25,275 Expense for network charges and rewards (13,239 ) (13,834 ) (10,699 ) Net credit card fees 14,177 12,965 14,576 Corporate card: Fee income 196,984 199,651 179,642 Expense for network charges and rewards (102,596 ) (100,011 ) (94,823 ) Net corporate card fees 94,388 99,640 84,819 Merchant: Fee income 31,517 30,241 31,863 Fees to cardholder banks (8,779 ) (7,831 ) (8,228 ) Expense for network charges (3,449 ) (3,177 ) (3,566 ) Net merchant fees 19,289 19,233 20,069 Total bank card transaction fees $ 167,879 $ 171,576 $ 155,100 The majority of debit and credit card fees are reported in the Consumer segment, while corporate card and merchant fees are reported in the Commercial segment.
Trust Fees [Table Text Block]	The following table shows the components of revenue within trust fees, which are reported within the Wealth segment. For the Years Ended December 31 (In thousands) 2019 2018 2017 Private client $ 118,832 $ 111,533 $ 100,358 Institutional 29,468 29,241 27,477 Other 7,328 7,190 7,324 Total trust fees $ 155,628 $ 147,964 $ 135,159
Deposit Account Charges and Other Fees [Table Text Block]	The following table shows the components of revenue within deposit account charges and other fees. For the Years Ended December 31 (In thousands) 2019 2018 2017 Corporate cash management fees $ 41,442 $ 38,468 $ 36,044 Overdraft and return item fees 30,596 31,468 30,576 Other service charges on deposit accounts 23,945 24,581 23,440 Total deposit account charges and other fees $ 95,983 $ 94,517 $ 90,060 Approximately half of this revenue is reported in the Consumer segment, while the remainder is reported in the Commercial segment.
Consumer Brokerage Services Revenue [Table Text Block]	The following shows the components of revenue within consumer brokerage services, and nearly all of this revenue is reported in the Company's Wealth segment. For the Years Ended December 31 (In thousands) 2019 2018 2017 Commission income $ 9,071 $ 8,956 $ 8,400 Managed account services 6,733 6,851 6,230 Total consumer brokerage services $ 15,804 $ 15,807 $ 14,630

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2019 and 2018 . There were no transfers among levels during these years. 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) 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 December 31, 2018 Assets: Residential mortgage loans held for sale $ 13,529 $ — $ 13,529 $ — Available for sale debt securities: U.S. government and federal agency obligations 907,652 907,652 — — Government-sponsored enterprise obligations 195,778 — 195,778 — State and municipal obligations 1,328,039 — 1,313,881 14,158 Agency mortgage-backed securities 3,214,985 — 3,214,985 — Non-agency mortgage-backed securities 1,047,716 — 1,047,716 — Asset-backed securities 1,511,614 — 1,511,614 — Other debt securities 332,257 — 332,257 — Trading debt securities 27,059 — 27,059 — Equity securities 2,585 2,585 — — Private equity investments 85,659 — — 85,659 Derivatives * 41,210 — 40,627 583 Assets held in trust for deferred compensation plan 12,968 12,968 — — Total assets 8,721,051 923,205 7,697,446 100,400 Liabilities: Derivatives * 13,421 — 13,328 93 Liabilities held in trust for deferred compensation plan 12,968 12,968 — — Total liabilities $ 26,389 $ 12,968 $ 13,328 $ 93 * The fair value of each class of derivative is shown in Note 19. .
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 Year ended December 31, 2019: Balance at January 1, 2019 $ 14,158 $ 85,659 $ 490 $ 100,307 Total gains or losses (realized/unrealized): Included in earnings — (727 ) (93 ) (820 ) Included in other comprehensive income 246 — — 246 Investment securities called (4,635 ) — — (4,635 ) Discount accretion 84 — — 84 Purchases of private equity securities — 15,706 — 15,706 Sale / pay down of private equity securities — (6,548 ) — (6,548 ) Capitalized interest/dividends — 32 — 32 Purchase of risk participation agreement — — 439 439 Sale of risk participation agreement — — (467 ) (467 ) Balance at December 31, 2019 $ 9,853 $ 94,122 $ 369 $ 104,344 Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2019 $ — $ (2,177 ) $ 457 $ (1,720 ) Year ended December 31, 2018: Balance at January 1, 2018 $ 17,016 $ 55,752 $ 503 $ 73,271 Total gains or losses (realized/unrealized): Included in earnings — 13,849 105 13,954 Included in other comprehensive income (274 ) — — (274 ) Investment securities called (2,616 ) — — (2,616 ) Discount accretion 32 — — 32 Purchases of private equity securities — 16,395 — 16,395 Sale / pay down of private equity securities — (371 ) — (371 ) Capitalized interest/dividends — 34 — 34 Purchase of risk participation agreement — — 61 61 Sale of risk participation agreement — — (179 ) (179 ) Balance at December 31, 2018 $ 14,158 $ 85,659 $ 490 $ 100,307 Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2018 $ — $ 13,849 $ 663 $ 14,512
Summary Of Gains And Losses On Level 3 Assets And Liabilities	Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories: (In thousands) Loan Fees and Sales Other Non-Interest Income Investment Securities Gains (Losses), Net Total Year ended December 31, 2019: Total gains or losses included in earnings $ (77 ) $ (16 ) $ (727 ) $ (820 ) Change in unrealized gains or losses relating to assets still held at December 31, 2019 $ 458 $ (1 ) $ (2,177 ) $ (1,720 ) Year ended December 31, 2018: Total gains or losses included in earnings $ (45 ) $ 150 $ 13,849 $ 13,954 Change in unrealized gains or losses relating to assets still held at December 31, 2018 $ 535 $ 128 $ 13,849 $ 14,512
Summary Of Quantitative Information About Level 3 Fair Value Measurements	Level 3 Inputs As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, 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 $9.9 million at December 31, 2019 , while private equity investments, included in other securities, totaled $94.1 million . Information about these inputs is presented in the table and discussions 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 Estimated market rate 3.4% - 3.7% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 47.8% - 100.0% 83.7% Embedded servicing value —% - 2.3% 1.2%
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]	Instruments Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis during 2019 and 2018 , and still held as of December 31, 2019 and 2018 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2019 and 2018 . 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) Balance at December 31, 2019 Collateral dependent impaired loans $ 422 $ — $ — $ 422 $ (263 ) Mortgage servicing rights 7,749 — — 7,749 (327 ) Long-lived assets 1,098 — — 1,098 (362 ) Balance at December 31, 2018 Collateral dependent impaired loans $ 294 $ — $ — $ 294 $ (269 ) Mortgage servicing rights 6,478 — — 6,478 9 Long-lived assets 914 — — 914 (552 )

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]	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 December 31, 2019 and 2018 : 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 Carrying Amount Estimated Fair Value at December 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 5,106,427 $ — $ — $ 5,017,694 $ 5,017,694 Real estate - construction and land 869,659 — — 868,274 868,274 Real estate - business 2,875,788 — — 2,846,095 2,846,095 Real estate - personal 2,127,083 — — 2,084,370 2,084,370 Consumer 1,955,572 — — 1,916,627 1,916,627 Revolving home equity 376,399 — — 365,069 365,069 Consumer credit card 814,134 — — 756,651 756,651 Overdrafts 15,236 — — 11,223 11,223 Total loans 14,140,298 — — 13,866,003 13,866,003 Loans held for sale 20,694 — 20,694 — 20,694 Investment securities 8,698,666 910,237 7,643,290 145,139 8,698,666 Federal funds sold 3,320 3,320 — — 3,320 Securities purchased under agreements to resell 700,000 — — 693,228 693,228 Interest earning deposits with banks 689,876 689,876 — — 689,876 Cash and due from banks 507,892 507,892 — — 507,892 Derivative instruments 41,210 — 40,627 583 41,210 Assets held in trust for deferred compensation plan 12,968 12,968 — — 12,968 Total $ 24,814,924 $ 2,124,293 $ 7,704,611 $ 14,704,953 $ 24,533,857 Financial Liabilities Non-interest bearing deposits $ 6,980,298 $ 6,980,298 $ — $ — $ 6,980,298 Savings, interest checking and money market deposits 11,685,239 11,685,239 — — 11,685,239 Certificates of deposit 1,658,122 — — 1,663,748 1,663,748 Federal funds purchased 13,170 13,170 — — 13,170 Securities sold under agreements to repurchase 1,943,219 — — 1,944,458 1,944,458 Other borrowings 8,702 — 7,751 951 8,702 Derivative instruments 13,421 — 13,328 93 13,421 Liabilities held in trust for deferred compensation plan 12,968 12,968 — — 12,968 Total $ 22,315,139 $ 18,691,675 $ 21,079 $ 3,609,250 $ 22,322,004

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instrument Detail [Abstract]
Schedule Of Notional Amounts Of 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. With the exception of the interest rate floors (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. December 31 (In thousands) 2019 2018 Interest rate swaps $ 2,606,181 $ 2,006,280 Interest rate floors 1,500,000 1,000,000 Interest rate caps 59,316 62,163 Credit risk participation agreements 316,225 143,460 Foreign exchange contracts 10,936 6,206 Mortgage loan commitments 13,755 14,544 Mortgage loan forward sale contracts 1,943 5,768 Forward TBA contracts 17,500 16,500 Total notional amount $ 4,525,856 $ 3,254,921
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. 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 offset against the fair values of cleared swaps, such that at December 31, 2019 in the table below, 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 . At December 31, 2018 , the positive fair values of cleared swaps were reduced by $8.1 million and the negative fair values of cleared swaps were reduced by $6.5 million . Asset Derivatives Liability Derivatives December 31 December 31 2019 2018 2019 2018 (In thousands ) Fair Value Fair Value Derivatives designated as hedging instruments: Interest rate floors $ 67,192 $ 29,031 $ — $ — Total derivatives designated as hedging instruments $ 67,192 $ 29,031 $ — $ — Derivatives not designated as hedging instruments: Interest rate swaps $ 37,774 $ 11,537 $ (9,916 ) $ (13,110 ) Interest rate caps 4 24 (4 ) (24 ) Credit risk participation agreements 140 47 (230 ) (93 ) Foreign exchange contracts 97 20 (32 ) (8 ) Mortgage loan commitments 459 536 — — Mortgage loan forward sale contracts 6 15 (2 ) (8 ) Forward TBA contracts 2 — (35 ) (178 ) Total derivatives not designated as hedging instruments $ 38,482 $ 12,179 $ (10,219 ) $ (13,421 ) Total $ 105,674 $ 41,210 $ (10,219 ) $ (13,421 )
Summary of Cash Flow Hedge Activity [Table Text Block]	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 (In thousands) Total Included Component Excluded Component For the Year Ended December 31, 2019 Derivatives in cash flow hedging relationships: Interest rate floors* $ 27,481 $ 50,327 $ (22,846 ) Interest and fees on loans $ (3,793 ) $ — $ (3,793 ) Total $ 27,481 $ 50,327 $ (22,846 ) Total $ (3,793 ) $ — $ (3,793 ) For the Year Ended December 31, 2018 Derivatives in cash flow hedging relationships: Interest rate floors* $ 8,381 $ — $ 8,381 Interest and fees on loans $ (760 ) $ — $ (760 ) Total $ 8,381 $ — $ 8,381 Total $ (760 ) $ — $ (760 ) * No hedging relationship existed during 2017.
Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income	Location of Gain or (Loss) Recognized in Income on Derivative Amount of Gain or (Loss) Recognized in Income on Derivative For the Years Ended December 31 (In thousands) 2019 2018 2017 Derivative instruments: Interest rate swaps Other non-interest income $ 4,732 $ 3,914 $ 1,978 Interest rate caps Other non-interest income — 11 — Credit risk participation agreements Other non-interest income (16 ) 150 35 Foreign exchange contracts: Other non-interest income 53 31 (80 ) Mortgage loan commitments Loan fees and sales (77 ) (45 ) 231 Mortgage loan forward sale contracts Loan fees and sales (3 ) 5 64 Forward TBA contracts Loan fees and sales (837 ) 414 (648 ) Total $ 3,852 $ 4,480 $ 1,580
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 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 December 31, 2018 Assets: Derivatives subject to master netting agreements $ 40,613 $ — $ 40,613 $ (2,992 ) $ (26,174 ) $ 11,447 Derivatives not subject to master netting agreements 597 — 597 Total derivatives 41,210 — 41,210 Liabilities: Derivatives subject to master netting agreements 13,333 — 13,333 (2,992 ) (261 ) 10,080 Derivatives not subject to master netting agreements 88 — 88 Total derivatives 13,421 — 13,421

Resale and Repurchase Agreeme_2

Resale and Repurchase Agreements Resale and Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2019
Offsetting [Abstract]
Offsetting, 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 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 ) — December 31, 2018 Total resale agreements, subject to master netting arrangements $ 1,150,000 $ (450,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 2,393,219 (450,000 ) 1,943,219 — (1,943,219 ) —
Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]	The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2019 and 2018 , 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 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 December 31, 2018 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 387,541 $ 150,000 $ 100,000 $ 637,541 Government-sponsored enterprise obligations 18,466 — — 18,466 Agency mortgage-backed securities 882,744 31,774 213,752 1,128,270 Non-agency mortgage-backed securities 187,740 — — 187,740 Asset-backed securities 322,680 — — 322,680 Other debt securities 98,522 — — 98,522 Total repurchase agreements, gross amount recognized $ 1,897,693 $ 181,774 $ 313,752 $ 2,393,219

Commitments, Contingencies An_2

Commitments, Contingencies And Guarantees (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Off-Balance Sheet Instruments Commitments	The following table summarizes these commitments at December 31: (In thousands) 2019 2018 Commitments to extend credit: Credit card $ 5,063,166 $ 5,328,502 Other 6,123,264 5,840,967 Standby letters of credit, net of participations 377,338 353,905 Commercial letters of credit 7,050 13,774

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Schedule Of Related Party Expenses	The Company’s Chief Executive Officer, its Executive Chairman, and its former Vice Chairman are directors of Tower Properties Company (Tower) and, together with members of their immediate families, beneficially own approximately 67% of the outstanding stock of Tower. At December 31, 2019 , Tower owned 211,996 shares of Company stock. Tower is primarily engaged in the business of owning, developing, leasing and managing real property. Payments from the Company and its affiliates to Tower are summarized below. These payments, with the exception of dividend payments, relate to property management services, including construction oversight, on three Company-owned office buildings and related parking garages in downtown Kansas City. (In thousands) 2019 2018 2017 Leasing agent fees $ 154 $ 133 $ 32 Operation of parking garages 118 95 82 Building management fees 2,001 1,935 1,954 Property construction management fees 250 136 146 Dividends paid on Company stock held by Tower 210 181 232 Total $ 2,733 $ 2,480 $ 2,446

Parent Company Condensed Fina_2

Parent Company Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets December 31 (In thousands) 2019 2018 Assets Investment in consolidated subsidiaries: Bank $ 2,687,692 $ 2,587,489 Non-banks 71,290 67,538 Cash 301,913 207,462 Investment securities: Available for sale debt 1,399 2,576 Equity 2,969 3,191 Note receivable due from bank subsidiary 50,000 50,000 Advances to subsidiaries, net of borrowings 26,097 19,867 Income tax benefits 9,973 8,590 Other assets 23,528 23,734 Total assets $ 3,174,861 $ 2,970,447 Liabilities and stockholders’ equity Pension obligation $ 13,028 $ 12,645 Other liabilities 27,149 26,504 Total liabilities 40,177 39,149 Stockholders’ equity 3,134,684 2,931,298 Total liabilities and stockholders’ equity $ 3,174,861 $ 2,970,447
Condensed Statements Of Income	Condensed Statements of Income For the Years Ended December 31 (In thousands) 2019 2018 2017 Income Dividends received from consolidated bank subsidiary $ 500,000 $ 200,000 $ 160,002 Earnings of consolidated subsidiaries, net of dividends (79,641 ) 233,785 147,678 Interest and dividends on investment securities 1,698 10,698 2,099 Management fees charged to subsidiaries 36,776 37,688 30,431 Investment securities gains (losses) 3,572 (4,581 ) 41,717 Net interest income on advances and note to subsidiaries 1,208 1,299 514 Other 4,700 2,390 3,346 Total income 468,313 481,279 385,787 Expense Salaries and employee benefits 32,882 33,588 33,714 Professional fees 2,050 2,383 2,036 Data processing fees paid to affiliates 3,142 3,341 3,512 Community service 87 152 32,093 Other 13,019 10,729 10,671 Total expense 51,180 50,193 82,026 Income tax benefit (4,098 ) (2,456 ) (15,622 ) Net income $ 421,231 $ 433,542 $ 319,383
Condensed Statements Of Cash Flows	Condensed Statements of Cash Flows For the Years Ended December 31 (In thousands ) 2019 2018 2017 Operating Activities Net income $ 421,231 $ 433,542 $ 319,383 Adjustments to reconcile net income to net cash provided by operating activities: Earnings of consolidated subsidiaries, net of dividends 79,641 (233,785 ) (147,678 ) Other adjustments, net 2,491 2,505 (11,268 ) Net cash provided by operating activities 503,363 202,262 160,437 Investing Activities Decrease in securities purchased under agreements to resell — — 155,775 (Increase) decrease in investment in subsidiaries, net (12 ) — 11 Proceeds from sales of investment securities 3,856 41,638 11,006 Proceeds from maturities/pay downs of investment securities 1,150 1,988 2,295 Purchases of investment securities (63 ) (125 ) — Note receivable due from bank subsidiary — — (50,000 ) Increase in advances to subsidiaries, net (6,230 ) (5,296 ) (9,518 ) Net purchases of building improvements and equipment (235 ) (133 ) (52 ) Net cash provided by (used in) investing activities (1,534 ) 38,072 109,517 Financing Activities Purchases of treasury stock (134,904 ) (75,231 ) (17,771 ) Accelerated share repurchase agreements (150,000 ) — — Issuance of stock under equity compensation plans (8 ) (10 ) (8 ) Cash dividends paid on common stock (113,466 ) (100,238 ) (91,619 ) Cash dividends paid on preferred stock (9,000 ) (9,000 ) (9,000 ) Net cash used in financing activities (407,378 ) (184,479 ) (118,398 ) Increase in cash 94,451 55,855 151,556 Cash at beginning of year 207,462 151,607 51 Cash at end of year $ 301,913 $ 207,462 $ 151,607 Income tax receipts, net $ (2,337 ) $ (1,965 ) $ (8,991 )

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2019
Buildings [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	30 years
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	10 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable lives for asset, years	10 years
Core Deposits [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Core deposit intangibles amortized over useful life, years	8 years
Core Deposits [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Core deposit intangibles amortized over useful life, years	14 years

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Locations	Dec. 31, 2018USD ($)
Locations | Locations	316
Restricted Cash and Cash Equivalents	$ 20,300	$ 8,200
Federal Reserve Bank Reserve Requirement	160,700
Cash Held at Federal Reserve Bank	$ 395,900
Amortization period of annual fees on credit card loans, months	12 months
Period past due loans are placed on non-accrual, days	90 days
Consumer loans charged down to fair value, days delinquent	120 days
Period past due credit card loans are charged off, days	180 days
Common stock dividend rate percentage	5.00%	5.00%
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 33,320

Loans And Allowance For Loan _3

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Abstract]
Loans To Principal Holders (over 10% ownership in the Company's stock)	$ 0
Unfunded Loan Commitments	11,200,000,000
Unused Approved Credit Card Lines of Credit	5,100,000,000
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	4,000,000,000
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings	1,600,000,000
Net Investment in Direct Financing and Sales Type Leases	795,826,000	$ 752,200,000
Deferred income on direct financing and sales-type leases	71,800,000	62,600,000
Property Subject to or Available for Operating Lease, Net	14,700,000	16,100,000
Decrease in interest income resulting from modification to credit card loans	(1,200,000)
Commitments to lend additional funds to customers with restructured loans	4,700,000	1,800,000
Loans Held-for-sale, Fair Value Disclosure	9,200,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	8,900,000
Personal Real Estate Loans HFS Past Due	0
Personal Real Estate Loans HFS on Non-Accrual Status	0
Student Loans Held for Sale, Lower of Cost or Fair Value	4,600,000
HFS Student Loans on Non-Accrual Status	0
HFS Student Loans Past Due	0
Foreclosed real estate	365,000	1,400,000
Personal property acquired in repossession	$ 5,500,000	$ 2,000,000

Loans And Allowance For Loan _4

Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 14,737,817	$ 14,140,298
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	5,565,449	5,106,427
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	899,377	869,659
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,833,554	2,875,788
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,354,760	2,127,083
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,964,145	1,955,572
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	349,251	376,399
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	764,977	814,134
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 6,304	$ 15,236

Loans And Allowance For Loan _5

Loans And Allowance For Loan Losses Loans And Allowance For Loan Losses (Loans to Directors and Executive Officers) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans to directors and executive officers, beginning balance	$ 46,728
Additions	133,607
Amounts collected	(123,956)
Amounts written off	0
Loans to directors and executive officers, ending balance	$ 56,379

Loans And Allowance For Loan _6

Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 159,932	$ 159,532	$ 155,932
Provision for loan losses	50,438	42,694	45,244
Loans charged off	61,880	55,821	55,179
Less recoveries	12,192	13,527	13,535
Net loans charged-off (recoveries)	49,688	42,294	41,644
Balance at end of period	160,682	159,932	159,532
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	92,869	93,704	91,361
Provision for loan losses	2,816	254	2,327
Loans charged off	4,711	3,164	2,538
Less recoveries	786	2,075	2,554
Net loans charged-off (recoveries)	3,925	1,089	(16)
Balance at end of period	91,760	92,869	93,704
Personal Banking Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	67,063	65,828	64,571
Provision for loan losses	47,622	42,440	42,917
Loans charged off	57,169	52,657	52,641
Less recoveries	11,406	11,452	10,981
Net loans charged-off (recoveries)	45,763	41,205	41,660
Balance at end of period	$ 68,922	$ 67,063	$ 65,828

Loans And Allowance For Loan _7

Loans And Allowance For Loan Losses (Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	$ 2,746	$ 2,696
Impaired loans, Loans outstanding	81,732	78,616
All other loans, Allowance for loan losses	157,936	157,236
All other loans, Loans outstanding	14,656,085	14,061,682
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	1,629	1,780
Impaired loans, Loans outstanding	64,500	61,496
All other loans, Allowance for loan losses	90,131	91,089
All other loans, Loans outstanding	9,233,880	8,790,378
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	1,117	916
Impaired loans, Loans outstanding	17,232	17,120
All other loans, Allowance for loan losses	67,805	66,147
All other loans, Loans outstanding	$ 5,422,205	$ 5,271,304

Loans And Allowance For Loan _8

Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 10,220	$ 12,536
Restructured loans (accruing)	71,512	66,080
Total impaired loans	$ 81,732	$ 78,616

Loans And Allowance For Loan _9

Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 81,732	$ 78,616
Impaired Financing Receivable, Unpaid Principal Balance	90,390	87,074
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,054	8,725
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,738	14,477
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	74,678	69,891
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	76,652	72,597
Impaired Financing Receivable, Related Allowance	2,746	2,696
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,054	8,725
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,738	14,477
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	30,437	40,286
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	30,487	40,582
Impaired Financing Receivable, Related Allowance	837	1,223
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	46	416
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	51	421
Impaired Financing Receivable, Related Allowance	1	11
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	26,963	12,069
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	27,643	12,699
Impaired Financing Receivable, Related Allowance	791	546
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,729	4,461
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,968	6,236
Impaired Financing Receivable, Related Allowance	258	266
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,421	5,510
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,421	5,510
Impaired Financing Receivable, Related Allowance	35	38
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	35	40
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	35	40
Impaired Financing Receivable, Related Allowance	1	1
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,047	7,109
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,047	7,109
Impaired Financing Receivable, Related Allowance	$ 823	$ 611

Loans And Allowance For Loan_10

Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 11,923	$ 9,741
Restructured loans (accruing)	65,211	89,787
Average impaired loans	77,134	99,528
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	9,892	7,619
Restructured loans (accruing)	49,544	73,261
Average impaired loans	59,436	80,880
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	2,031	2,122
Restructured loans (accruing)	15,667	16,526
Average impaired loans	$ 17,698	$ 18,648

Loans And Allowance For Loan_11

Loans And Allowance For Loan Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 4,040	$ 3,995	$ 5,082
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	1,329	2,219	3,135
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	2	25	41
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	1,456	558	514
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	136	139	402
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	286	305	307
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	3	3	10
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 828	$ 746	$ 673

Loans And Allowance For Loan_12

Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 14,627,638	$ 14,038,417
30 – 89 Days Past Due	80,100	72,687
90 Days Past Due and Still Accruing	19,859	16,658
Non-accrual	10,220	12,536
Total	14,737,817	14,140,298
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	5,565,449	5,106,427
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	899,377	869,659
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,833,554	2,875,788
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,354,760	2,127,083
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,964,145	1,955,572
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	349,251	376,399
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	764,977	814,134
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,304	15,236
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	5,545,104	5,086,912
30 – 89 Days Past Due	12,064	10,057
90 Days Past Due and Still Accruing	792	473
Non-accrual	7,489	8,985
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	882,826	867,692
30 – 89 Days Past Due	13,046	1,963
90 Days Past Due and Still Accruing	3,503	0
Non-accrual	2	4
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,830,494	2,867,347
30 – 89 Days Past Due	2,030	6,704
90 Days Past Due and Still Accruing	0	22
Non-accrual	1,030	1,715
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	2,345,243	2,118,045
30 – 89 Days Past Due	6,129	6,041
90 Days Past Due and Still Accruing	1,689	1,165
Non-accrual	1,699	1,832
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	1,928,082	1,916,320
30 – 89 Days Past Due	34,053	35,608
90 Days Past Due and Still Accruing	2,010	3,644
Non-accrual	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	347,258	374,830
30 – 89 Days Past Due	1,743	875
90 Days Past Due and Still Accruing	250	694
Non-accrual	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	742,659	792,334
30 – 89 Days Past Due	10,703	11,140
90 Days Past Due and Still Accruing	11,615	10,660
Non-accrual	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	5,972	14,937
30 – 89 Days Past Due	332	299
90 Days Past Due and Still Accruing	0	0
Non-accrual	$ 0	$ 0

Loans And Allowance For Loan_13

Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 9,298,380	$ 8,851,874
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,910,119	8,558,943
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	215,256	138,153
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	164,484	144,074
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,521	10,704
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,565,449	5,106,427
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	899,377	869,659
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,833,554	2,875,788
Commercial Portfolio Segment [Member] | Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,393,928	4,915,042
Commercial Portfolio Segment [Member] | Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	80,089	84,391
Commercial Portfolio Segment [Member] | Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	83,943	98,009
Commercial Portfolio Segment [Member] | Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	7,489	8,985
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	856,364	866,527
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	42,541	1,917
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	470	1,211
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2	4
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,659,827	2,777,374
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	92,626	51,845
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	80,071	44,854
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 1,030	$ 1,715

Loans And Allowance For Loan_14

Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Abstract]
Credit Quality Personal Real Estate Loans Excluded	$ 198.2	$ 201.7
Consumer Healthcare Loans Excluded	$ 199.2	$ 170.3
Credit quality personal banking loan table percentage loans excluded	8.00%
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real Estate - Personal [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.00%	1.10%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.90%	1.80%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.20%	9.40%
Real Estate - Personal [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.70%	24.70%
Real Estate - Personal [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	62.20%	63.00%
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.00%	3.10%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.20%	4.80%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	15.40%	16.10%
Consumer [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.00%	25.70%
Consumer [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	49.40%	50.30%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.70%	0.80%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.90%	1.70%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.00%	9.10%
Revolving Home Equity [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	21.50%	24.00%
Revolving Home Equity [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	65.90%	64.40%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.60%	4.40%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	14.30%	14.00%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.20%	34.80%
Consumer Credit Card [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.60%	26.40%
Consumer Credit Card [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	21.30%	20.40%

Loans And Allowance For Loan_15

Loans And Allowance For Loan Losses Loans And Allowance For Loan Losses (Troubled Debt Restructurings by Type of Modification) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 79,450	$ 75,839
Performing/Accruing TDR Commercial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	55,934	50,904
Performing/AccruingTDR - Assistance programs [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	8,365	7,410
Performing/Accruing TDR - Consumer Bankruptcy [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	3,592	4,103
Performing/Accruing TDR - Other Consumer [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	3,621	3,663
TDR Non-accrual loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 7,938	$ 9,759

Loans And Allowance For Loan_16

Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	$ 79,450	$ 75,839
Balance 90 days past due at any time during previous 12 months	1,417
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	37,055
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	44
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]
Restructured loans	25,933
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]
Restructured loans	3,915
Balance 90 days past due at any time during previous 12 months	347
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	4,421
Balance 90 days past due at any time during previous 12 months	83
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	35
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]
Restructured loans	8,047
Balance 90 days past due at any time during previous 12 months	$ 987

Investment Securities (Narrativ

Investment Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019USD ($)Investments_In_Single_Issuer	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Investment [Line Items]
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 51,600,000	$ 57,700,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	13,275,000	14,092,000	$ 14,199,000	$ 14,080,000
Portfolio securities aggregate fair value loss position	1,654,114,000	5,435,496,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,864,000	99,824,000
Available for sale securities in loss position at period end, change in unrealized loss	(87,000,000)
Securities pledged as collateral	4,300,000,000		$ 4,300,000,000
Securities pledged and may be sold or re-pledged	$ 204,900,000
Number of investments in a single issuer that exceed 10% of stockholder's equity | Investments_In_Single_Issuer	0
No investment in a single issuer exceeds this percentage of stockholder's equity	10.00%
Visa Class B Shares [Member]
Investment [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount	$ 0
US Treasury and Government [Member]
Investment [Line Items]
U.S. Treasury inflation-protected securities held	461,800,000
Portfolio securities aggregate fair value loss position	57,192,000	434,427,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	42,000	11,379,000
State and Municipal Obligations [Member]
Investment [Line Items]
Auction rate securities held at fair value	9,900,000
Portfolio securities aggregate fair value loss position	8,254,000	414,889,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	32,000	5,030,000
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Par value securities with other-than-temporary impairment	17,500,000
Fair Value Securities with Other-Than-Temporary Impairment	13,100,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	13,300,000
Portfolio securities aggregate fair value loss position	292,678,000	865,191,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 705,000	$ 12,779,000

Investment Securities (Investme

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale	$ 8,571,626	$ 8,538,041
Trading securities	28,161	27,059
Equity securities with readily determinable fair values	2,929	2,585
Equtiy Securities without Readily Determinable Fair Values	1,280	1,824
Federal Reserve Bank Stock	33,770	33,498
Federal Home Loan Bank Stock	10,000	10,000
Private Equity Investments	94,122	85,659
Total investment securities	$ 8,741,888	$ 8,698,666

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 8,435,531	$ 8,602,599
Debt Securities, Available-for-sale, Fair Value		8,571,626	8,538,041
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		827,861	914,486
Debt Securities, Available-for-sale, Fair Value		$ 851,776	907,652
Weighted Average Yield	[1]	1.54%
U.S. Government And Federal Agency Obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 57,234
Debt Securities, Available-for-sale, Fair Value		$ 57,192
Weighted Average Yield	[1]	(0.01%)
U.S. Government And Federal Agency Obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 518,035
Debt Securities, Available-for-sale, Fair Value		$ 533,805
Weighted Average Yield	[1]	2.17%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 252,592
Debt Securities, Available-for-sale, Fair Value		$ 260,779
Weighted Average Yield	[1]	0.59%
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 138,734	199,470
Debt Securities, Available-for-sale, Fair Value		$ 139,277	195,778
Weighted Average Yield		2.26%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 81,616
Debt Securities, Available-for-sale, Fair Value		$ 81,830
Weighted Average Yield		1.99%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 57,118
Debt Securities, Available-for-sale, Fair Value		$ 57,447
Weighted Average Yield		2.65%
State and municipal obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 1,225,532	1,322,785
Debt Securities, Available-for-sale, Fair Value		$ 1,267,927	1,328,039
Weighted Average Yield		2.49%
State and municipal obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 51,230
Debt Securities, Available-for-sale, Fair Value		$ 51,540
Weighted Average Yield		2.55%
State and municipal obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 740,283
Debt Securities, Available-for-sale, Fair Value		$ 763,396
Weighted Average Yield		2.42%
State and municipal obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 377,009
Debt Securities, Available-for-sale, Fair Value		$ 395,014
Weighted Average Yield		2.56%
State and municipal obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 57,010
Debt Securities, Available-for-sale, Fair Value		$ 57,977
Weighted Average Yield		2.92%
Agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 3,893,247	3,253,433
Debt Securities, Available-for-sale, Fair Value		$ 3,937,964	3,214,985
Weighted Average Yield		2.87%
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 796,451	1,053,854
Debt Securities, Available-for-sale, Fair Value		$ 809,782	1,047,716
Weighted Average Yield		2.98%
Asset-backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 1,228,151	1,518,976
Debt Securities, Available-for-sale, Fair Value		$ 1,233,489	1,511,614
Weighted Average Yield		2.61%
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 5,917,849	5,826,263
Debt Securities, Available-for-sale, Fair Value		$ 5,981,235	5,774,315
Weighted Average Yield		2.83%
Other Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 325,555	339,595
Debt Securities, Available-for-sale, Fair Value		331,411	$ 332,257
Other Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		51,998
Debt Securities, Available-for-sale, Fair Value		52,180
Other Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		218,950
Debt Securities, Available-for-sale, Fair Value		222,770
Other Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		54,607
Debt Securities, Available-for-sale, Fair Value		$ 56,461
[1]	Rate does not reflect inflation adjustment on inflation-protected securities

Investment Securities (Availabl

Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 8,435,531	$ 8,602,599
Available For Sale Securities, Gross Unreailzed Gain at Period End	148,959	35,266
Available For Sale Securities, Gross Unrealized Loss at Period End	(12,864)	(99,824)
Debt Securities, Available-for-sale, Fair Value	8,571,626	8,538,041
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	827,861	914,486
Available For Sale Securities, Gross Unreailzed Gain at Period End	23,957	4,545
Available For Sale Securities, Gross Unrealized Loss at Period End	(42)	(11,379)
Debt Securities, Available-for-sale, Fair Value	851,776	907,652
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	138,734	199,470
Available For Sale Securities, Gross Unreailzed Gain at Period End	730	55
Available For Sale Securities, Gross Unrealized Loss at Period End	(187)	(3,747)
Debt Securities, Available-for-sale, Fair Value	139,277	195,778
State and municipal obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,225,532	1,322,785
Available For Sale Securities, Gross Unreailzed Gain at Period End	42,427	10,284
Available For Sale Securities, Gross Unrealized Loss at Period End	(32)	(5,030)
Debt Securities, Available-for-sale, Fair Value	1,267,927	1,328,039
Agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,893,247	3,253,433
Available For Sale Securities, Gross Unreailzed Gain at Period End	50,890	9,820
Available For Sale Securities, Gross Unrealized Loss at Period End	(6,173)	(48,268)
Debt Securities, Available-for-sale, Fair Value	3,937,964	3,214,985
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	796,451	1,053,854
Available For Sale Securities, Gross Unreailzed Gain at Period End	14,036	6,641
Available For Sale Securities, Gross Unrealized Loss at Period End	(705)	(12,779)
Debt Securities, Available-for-sale, Fair Value	809,782	1,047,716
Asset-backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,228,151	1,518,976
Available For Sale Securities, Gross Unreailzed Gain at Period End	11,056	3,849
Available For Sale Securities, Gross Unrealized Loss at Period End	(5,718)	(11,211)
Debt Securities, Available-for-sale, Fair Value	1,233,489	1,511,614
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,917,849	5,826,263
Available For Sale Securities, Gross Unreailzed Gain at Period End	75,982	20,310
Available For Sale Securities, Gross Unrealized Loss at Period End	(12,596)	(72,258)
Debt Securities, Available-for-sale, Fair Value	5,981,235	5,774,315
Other Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	325,555	339,595
Available For Sale Securities, Gross Unreailzed Gain at Period End	5,863	72
Available For Sale Securities, Gross Unrealized Loss at Period End	(7)	(7,410)
Debt Securities, Available-for-sale, Fair Value	$ 331,411	$ 332,257

Investment Securities (Cash Flo

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Dec. 31, 2019
Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	9.00%
Credit support	0.00%
Loss severity	8.00%
Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	52.00%
Credit support	20.00%
Loss severity	63.00%

Investment Securities (Changes

Investment Securities (Changes In Recorded Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 13,275	$ 14,092	$ 14,199	$ 14,080
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	48	58	111
Credit losses on debt securities for which impairment was previously recognized	85	10	274
Increase in expected cash flows that are recognized over the remaining life of the security	$ (950)	$ (175)	$ (266)

Investment Securities (Securiti

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Less than 12 months, Fair Value	$ 1,136,297	$ 1,213,809
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9,413	11,098
12 months or longer, Fair Value	517,817	4,221,687
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,451	88,726
Total, Fair Value	1,654,114	5,435,496
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,864	99,824
US Treasury and Government [Member]
Investment [Line Items]
Less than 12 months, Fair Value	31,787	317,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21	6,515
12 months or longer, Fair Value	25,405	116,728
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	21	4,864
Total, Fair Value	57,192	434,427
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	42	11,379
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	6,155	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	187	0
12 months or longer, Fair Value	0	188,846
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	3,747
Total, Fair Value	6,155	188,846
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	187	3,747
State and municipal obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	6,700	157,838
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	31	704
12 months or longer, Fair Value	1,554	257,051
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	4,326
Total, Fair Value	8,254	414,889
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	32	5,030
Agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	652,352	330,933
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,306	1,502
12 months or longer, Fair Value	147,653	1,927,268
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	867	46,766
Total, Fair Value	800,005	2,258,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	6,173	48,268
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	102,931	207,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	254	1,085
12 months or longer, Fair Value	189,747	657,685
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	451	11,694
Total, Fair Value	292,678	865,191
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	705	12,779
Asset-backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	330,876	147,997
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,610	728
12 months or longer, Fair Value	152,461	813,427
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,108	10,483
Total, Fair Value	483,337	961,424
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5,718	11,211
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	1,086,159	686,436
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9,170	3,315
12 months or longer, Fair Value	489,861	3,398,380
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,426	68,943
Total, Fair Value	1,576,020	4,084,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,596	72,258
Other debt securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	5,496	51,836
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	564
12 months or longer, Fair Value	997	260,682
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3	6,846
Total, Fair Value	6,493	312,518
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 7	$ 7,410

Investment Securities (Proceeds

Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Proceeds from Sale of Available-for-sale Securities		$ 402,103	$ 667,227	$ 779,793
Proceeds from sale of equity securities		3,856	41,637	10,953
Proceeds from sales of other securities		7,244	0	1,634
Total proceeds	[1]	413,203	708,864	792,380
Investment securities gains (losses), net	[1]	3,626	(488)	25,051
Available-for-sale Securities [Member]
Investment [Line Items]
Loss Realized on Called Bond		0	0	(254)
Gains realized on sales		2,354	448	592
Loss realized on sales		(2,568)	(10,101)	(10,287)
Other-than-temporary impairment recognized on debt securities		(133)	(68)	(385)
Equity securities [Member]
Investment [Line Items]
Gain realized on donation		0	0	31,074
Gains realized on sales		3,262	1,759	10,653
Loss realized on sales		0	(8,917)	(10)
Equity Securities, Fair value adjustments, net		344	2,542	0
Other Investments [Member]
Investment [Line Items]
Gains realized on sales		1,094	0	381
Other securities, loss realized on sales		0	0	(880)
Fair value adjustments, net		$ (727)	$ 13,849	$ (5,833)
[1]	Available for sale debt securities, equity securities, and other securities.

Premises and Equipment schedule

Premises and Equipment schedule (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 923,097	$ 863,779
Less accumulated depreciation and amortization	552,460	530,660
Net land, buildings and equipment	370,637	333,119
Depreciation expense	30,800	28,600	$ 29,100
Repairs and maintenance expense	17,000	16,900	16,400
Interest Expense Capitalized on Construction Projects	0	0	$ 0
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	91,678	91,603
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	566,177	545,510
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	237,047	226,666
Right of use leased assets [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 28,195	$ 0

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0	$ 0
Recognized temporary impairment	(327)	0
Aggregate amortization expense for intangible assets	1,500	1,300	$ 1,300
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Recognized temporary impairment	(327)	0
Aggregate amortization expense for intangible assets	$ (1,005)	$ (617)

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 44,212	$ 41,609
Accumulated Amortization	(34,351)	(32,815)
Valuation allowance	(327)	0
Net Amount	9,534	8,794
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(29,485)	(28,954)
Valuation allowance	0	0
Net Amount	1,785	2,316
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,942	10,339
Accumulated Amortization	(4,866)	(3,861)
Valuation allowance	(327)	0
Net Amount	$ 7,749	$ 6,478

Goodwill And Other Intangible_5

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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

Goodwill And Other Intangible_6

Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Amortization	$ 1,500	$ 1,300	$ 1,300
Goodwill [Member]
Goodwill [Roll Forward]
Balance, beginning	138,921	138,921
Originations	0	0
Amortization	0	0
Impairment reversal	0	0
Balance, ending	138,921	138,921	138,921
Core Deposit Premium [Member]
Goodwill [Roll Forward]
Balance, beginning	2,316	2,965
Originations	0	0
Amortization	(531)	(649)
Impairment reversal	0	0
Balance, ending	1,785	2,316	2,965
Mortgage Servicing Rights [Member]
Goodwill [Roll Forward]
Balance, beginning	6,478	4,653
Originations	2,603	2,433
Amortization	(1,005)	(617)
Impairment reversal	(327)	9
Balance, ending	$ 7,749	$ 6,478	$ 4,653

Goodwill And Other Intangible_7

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 1,507
2021	1,286
2022	1,099
2023	919
2024	$ 770

Leases (Narrative - Lessee) (De

Leases (Narrative - Lessee) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 26,300
Operating Lease, Liability	27,024
Lease, Cost	$ 7,300
Operating Leases, Rent Expense, Net		$ 7,700	$ 7,300
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	1 month
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	34 years

Leases (Schedule of Maturity of

Leases (Schedule of Maturity of Operating Lease Liabilities) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, 2020	$ 5,913
Lessee, Operating Lease, Liability, Payments, 2021	5,001
Lessee, Operating Lease, Liability, Payments, 2022	4,304
Lessee, Operating Lease, Liability, Payments, 2023	3,802
Lessee, Operating Lease, Liability, Payments, 2024	2,530
Lessee, Operating Lease, Liability, Payments, Due after 2024	12,600
Lessee, Operating Lease, Liability, Payments, Total	34,150
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	7,126
Operating Lease, Liability	27,024
Legally binding minimum lease payments for operating leases signed but not yet commenced	$ 6,500

Leases (Schedule of Operating L

Leases (Schedule of Operating Lease Term and Discount Rate) (Details)	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	11 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.67%

Leases (Schedule of Supplementa

Leases (Schedule of Supplemental Cash Flow Information Related to Operating Leases) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating Lease, Payments	$ 5,989
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 3,958

Leases (Summary of Minimum Leas

Leases (Summary of Minimum Lease Commitments Under ASC 840) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, 2019	$ 5,763
Operating Leases, Future Minimum Payments, 2020	4,817
Operating Leases, Future Minimum Payments, 2021	4,055
Operating Leases, Future Minimum Payments, 2022	3,598
Operating Leases, Future Minimum Payments, 2023	3,273
Operating Leases, Future Minimum Payments, After 2023	15,161
Operating Leases, Future Minimum Payments Due	$ 36,667

Leases (Narrative - Lessor) (De

Leases (Narrative - Lessor) (Details)	Dec. 31, 2019
Minimum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term	1 month
Maximum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term	8 years

Leases (Components of Lease Inc

Leases (Components of Lease Income) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Operating Lease Income [Line Items]
Sales-type and Direct Financing Leases, Lease Income	$ 24,062
Operating Lease, Lease Income	7,951
Lease Income	32,013
Operating Lease Income from Related Party [Member]
Operating Lease Income [Line Items]
Operating Lease, Lease Income	$ 75

Leases (Net Investment in Sales

Leases (Net Investment in Sales-type and Direct Financing Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable	$ 738,809
Sales-type and Direct Financing Leases, Unguaranteed Residual Asset	53,408
Net Investment in Lease	792,217
Deferred Costs, Leasing, Net	3,609
Net Investment in Direct Financing and Sales Type Leases	$ 795,826	$ 752,200

Leases (Schedule of Maturity _2

Leases (Schedule of Maturity of Lease Receivables) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2020	$ 224,297
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2021	177,143
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2022	136,787
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2023	92,813
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2024	58,773
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, After 2024	114,188
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	804,001
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	65,192
Sales-type and Direct Financing Leases, Lease Receivable	738,809
Lessor, Operating Lease, Payments to be Received, 2020	7,564
Lessor, Operating Lease, Payments to be Received, 2021	7,511
Lessor, Operating Lease, Payments to be Received, 2022	13,816
Lessor, Operating Lease, Payments to be Received, 2023	5,536
Lessor, Operating Lease, Payments to be Received, 2024	4,811
Lessor, Operating Lease, Payments to be Received, After 2024	8,643
Lessor, Operating Lease, Payments to be Received	47,881
Lessor, Total Payments to be Received, 2020	231,861
Lessor, Total Payments to be Received, 2021	184,654
Lessor, Total Payments to be Received, 2022	150,603
Lessor, Total Payments to be Received, 2023	98,349
Lessor, Total Payments to be Received, 2024	63,584
Lessor, Total Payments to be Received, After 2024	122,831
Lessor, Total Payments to be Received	$ 851,882

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Total Time Open And Certificates Of Deposit) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Deposits [Abstract]
Due in 2020	$ 1,727,042
Due in 2021	229,487
Due in 2022	27,205
Due in 2023	14,387
Due in 2024	9,838
Thereafter	53
Total	$ 2,008,012

Deposits (Maturities Of Time Op

Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 117,635
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	144,309
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	223,756
Certificates Of Deposit under $100,000, Due in over 12 months	140,457
Certificates Of Deposit under $100,000	626,157
Certificates Of Deposit over $100,000, Due in 3 months or less	632,064
Certificates Of Deposit over $100,000, Due in over 3 through 6 months	286,240
Certificates Of Deposit over $100,000, Due in over 6 through 12 months	323,038
Certificates Of Deposit over $100,000, Due in over 12 months	140,513
Certificates Of Deposit over $100,000	1,381,855
Due in 3 months or less, Total	749,699
Due in over 3 through 6 months, Total	430,549
Due in over 6 through 12 months, Total	546,794
Due in over 12 months, Total	280,970
Total	2,008,012
Aggregate amount of time open and certificates of deposit that exceed the $250,000 FDIC insurance limit	$ 1,100,000

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) $ in Millions	Dec. 31, 2019USD ($)
Debt Disclosure [Abstract]
Short-term repurchase agreement comprised of non-insured customer funds	$ 1,800
FHLB issued letters of credit	$ 396.6

Borrowings (Short-Term Borrowin

Borrowings (Short-Term Borrowings) (Details) - Federal Funds Purchased And Repurchase Agreements [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Year End Weighted Rate	0.80%	0.90%	0.80%
Average Weighted Rate	1.60%	1.30%	0.70%
Average Balance Outstanding	$ 1,822,098	$ 1,514,144	$ 1,462,387
Maximum Outstanding at any Month End	2,394,294	1,981,761	1,984,071
Balance at December 31	$ 1,850,772	$ 1,956,389	$ 1,507,138

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, at federal statutory income tax rate	21.00%	21.00%	35.00%
Unrecognized Tax Benefits	$ 1,372	$ 1,257	$ 1,208
Unrecognized tax benefits impact the effective tax rate	$ 1,100	$ 993

Income Taxes (Schedule Of Compo

Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal, Current	$ 82,556	$ 90,390	$ 89,154
State and local, Current	12,323	10,223	7,735
Current, income tax expense (benefit)	94,879	100,613	96,889
U.S. federal, Deferred	11,388	3,220	12,190
State and local, Deferred	2,807	2,116	1,427
Deferred, income tax expense (benefit)	14,195	5,336	13,617
U.S. federal, Total	93,944	93,610	101,344
State and local, Total	15,130	12,339	9,162
Total income tax expense	$ 109,074	$ 105,949	$ 110,506

Income Taxes (Components Of Inc

Income Taxes (Components Of Income Tax Expense Recorded Directly To Stockholders Equity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrealized gain (loss) on securities available for sale	$ 50,163	$ (18,634)	$ 2,104
Components of income Tax Recorded Directly to Equity, Change in Fair Value of Cash Flow Hedge	7,818	2,286	0
Accumulated pension (benefit) loss	389	222	(184)
Income tax expense (benefit) allocated to stockholders’ equity	$ 58,370	$ (16,126)	$ 1,920

Income Taxes (Components Of Def

Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Loans, principally due to allowance for loan losses	$ 39,130	$ 39,169
Unrealized losses on available-for-sale securities	0	16,140
Equity-based compensation	7,554	7,609
Deferred compensation	6,662	5,911
Unearned fee income	5,053	4,125
Accrued expenses	4,270	2,152
Deferred tax assets, Other	4,057	4,640
Total deferred tax assets	66,726	79,746
Equipment lease financing	68,814	55,738
Unrealized gain on securities available for sale	34,024	0
Land, buildings and equipment	17,202	14,207
Cash flow hedges	9,015	2,104
Intangibles	6,491	5,973
Deferred tax liabilities, Other	7,331	5,309
Total deferred tax liabilities	142,877	83,331
Net deferred tax assets (liabilities)	$ (76,151)	$ (3,585)

Income Taxes (Schedule Of Compa

Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 111,364	$ 113,293	$ 150,461
Tax-exempt interest, net of cost to carry	(10,973)	(11,502)	(20,295)
Effective Income Tax Rate Reconciliation, Contribution of Appreciated Securities, Amount	0	0	(10,864)
State and local income taxes, net of federal tax benefit	11,953	9,748	5,955
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	0	(6,753)
Effective Income Tax Rate Reconciliation, Share-based Award Payments, Amount	(3,337)	(3,928)	(6,613)
Other	67	(1,662)	(1,385)
Total income tax expense	$ 109,074	$ 105,949	$ 110,506

Income Taxes (Schedule Of Accru

Income Taxes (Schedule Of Accrued Liability For Unrecognized Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,257	$ 1,208
Gross increases – tax positions in prior period	18	31
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(4)	0
Gross increases – current-period tax positions	361	322
Lapse of statute of limitations	(260)	(304)
Unrecognized tax benefits at end of year	$ 1,372	$ 1,257

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, discretionary contribution by employer	$ 0	$ 0	$ 5,500,000
Minimum Required Contribution, Next Fiscal Year	0
Contributions to the CERP	25,000	24,000	$ 439,000
Accumulated benefit obligation	120,600,000	$ 112,100,000
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	$ 1,900,000
Expected long-term rate of return on pension plan assets	5.00%	5.00%	6.00%
Annualized 10-year return for pension plan	7.30%
Rate of return	14.80%	(1.70%)
Expected pension expense for the upcoming fiscal year	$ 402,000
Pension expense	$ 2,000,000
Equity securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term investment target mix	35.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term investment target mix	65.00%
Change due to updated mortality projection scale [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Change in pension plan obligations due to change in mortality assumptions	$ (1,100,000)

Employee Benefit Plans (Employe

Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total employee benefits	$ 76,058	$ 71,297	$ 67,376
Payroll Taxes [Member]
Total employee benefits	26,959	25,712	24,402
Medical Plans [Member]
Total employee benefits	29,635	27,030	25,143
401K Plan [Member]
Total employee benefits	15,810	14,986	14,244
Pension Plans [Member]
Total employee benefits	605	651	704
Other [Member]
Total employee benefits	$ 3,049	$ 2,918	$ 2,883

Employee Benefit Plans (Compone

Employee Benefit Plans (Components Of The Net Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan [Abstract]
Service cost-benefits earned during the year	$ 607	$ 651	$ 621
Interest cost on projected benefit obligation	4,198	3,756	3,826
Expected return on plan assets	(4,842)	(5,255)	(5,785)
Amortization of prior service cost	(271)	(271)	(271)
Amortization of unrecognized net loss	2,288	2,267	2,313
Net periodic pension cost	$ 1,980	$ 1,148	$ 704

Employee Benefit Plans (Summary

Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at prior valuation date	$ 112,063	$ 120,667
Service cost	607	651	$ 621
Interest cost	4,198	3,756	3,826
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(7,016)	(6,622)
Actuarial (gain) loss	10,750	(6,389)
Projected benefit obligation at valuation date	120,602	112,063	120,667
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior valuation date	99,418	108,260
Actual return on plan assets	15,129	(2,244)
Employer contributions	25	24
Benefits paid	(7,016)	(6,622)
Fair value of plan assets at valuation date	107,556	99,418	$ 108,260
Funded status and net amount recognized at valuation date	$ (13,046)	$ (12,645)

Employee Benefit Plans (Schedul

Employee Benefit Plans (Schedule Of Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss), Pre-Tax Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan [Abstract]
Prior service (credit) cost	$ 1,265	$ 1,535
Accumulated loss	(30,516)	(32,342)
Accumulated other comprehensive loss	(29,251)	(30,807)
Cumulative employer contributions in excess of net periodic benefit cost	16,205	18,162
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	(13,046)	(12,645)
Net loss arising during period	(461)	(1,110)
Amortization of net loss	2,288	2,267	$ 2,313
Amortization of prior service cost	(271)	(271)	$ (271)
Total recognized in other comprehensive income	1,556	886
Total expense recognized in net periodic pension cost and other comprehensive income	$ (424)	$ (262)

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions On A Weighted Average Basis, Used In Accounting For Plans) (Details)	12 Months Ended
	Dec. 31, 2019Rate	Dec. 31, 2018Rate	Dec. 31, 2017Rate
Defined Benefit Plan [Abstract]
Determination of benefit obligation at year end, Discount rate	3.07%	4.14%	3.57%
Determination of benefit obligation at year end, Assumed credit on cash balance accounts	5.00%	5.00%	5.00%
Determination of net periodic benefit cost for year ended, Discount rate	4.13%	3.57%	3.95%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Effective Rate of Interest	3.81%	3.28%	3.28%
Determination of net periodic benefit cost for year ended, Long-term rate of return on assets	5.00%	5.00%	6.00%
Determination of net periodic benefit cost for year ended, Assumed credit on cash balance accounts	5.00%	5.00%	5.00%

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value Of Pension Plan Assets By Asset Category) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
U.S. government obligations		$ 851,776	$ 907,652
Government-sponsored enterprise obligations		139,277	195,778
State and municipal obligations		1,267,927	1,328,039
Agency mortgage-backed securities		3,937,964	3,214,985
Non-agency mortgage-backed securities		809,782	1,047,716
Asset-backed securities		1,233,489	1,511,614
Pension Plans [Member]
U.S. government obligations		4,746	2,994
Government-sponsored enterprise obligations	[1]	1,302	1,200
State and municipal obligations		8,612	8,299
Agency mortgage-backed securities	[2]	8,892	8,209
Non-agency mortgage-backed securities		3,919	4,398
Asset-backed securities		5,093	3,520
Corporate bonds	[3]	39,663	37,207
Mutual funds	[4]	6,315	8,645
Common stocks	[4]	22,552	18,173
International developed markets	[4]	4,674	5,046
Emerging markets	[4]	1,788	1,727
Total		107,556	99,418
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
U.S. government obligations		851,776	907,652
Government-sponsored enterprise obligations		0	0
State and municipal obligations		0	0
Agency mortgage-backed securities		0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Pension Plans [Member]
U.S. government obligations		4,746	2,994
Government-sponsored enterprise obligations	[1]	0	0
State and municipal obligations		0	0
Agency mortgage-backed securities	[2]	0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Corporate bonds	[3]	0	0
Mutual funds	[4]	6,315	8,645
Common stocks	[4]	22,552	18,173
International developed markets	[4]	4,674	5,046
Emerging markets	[4]	1,788	1,727
Total		40,075	36,585
Significant Other Observable Inputs (Level 2) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		139,277	195,778
State and municipal obligations		1,258,074	1,313,881
Agency mortgage-backed securities		3,937,964	3,214,985
Non-agency mortgage-backed securities		809,782	1,047,716
Asset-backed securities		1,233,489	1,511,614
Significant Other Observable Inputs (Level 2) [Member] | Pension Plans [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations	[1]	1,302	1,200
State and municipal obligations		8,612	8,299
Agency mortgage-backed securities	[2]	8,892	8,209
Non-agency mortgage-backed securities		3,919	4,398
Asset-backed securities		5,093	3,520
Corporate bonds	[3]	39,663	37,207
Mutual funds	[4]	0	0
Common stocks	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Total		67,481	62,833
Significant Unobservable Inputs (Level 3) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		0	0
State and municipal obligations		9,853	14,158
Agency mortgage-backed securities		0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Pension Plans [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations	[1]	0	0
State and municipal obligations		0	0
Agency mortgage-backed securities	[2]	0	0
Non-agency mortgage-backed securities		0	0
Asset-backed securities		0	0
Corporate bonds	[3]	0	0
Mutual funds	[4]	0	0
Common stocks	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Total		$ 0	$ 0
[1]	This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Federal Home Loan Bank, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association.
[2]	This category represents mortgage-backed securities issued by the agencies mentioned in (a).
[3]	This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries.
[4]	This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the financial services, technology services, healthcare, electronic technology, and producer manufacturing industries.

Employee Benefit Plans (Future

Employee Benefit Plans (Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Defined Benefit Plan [Abstract]
2020	$ 7,281
2021	7,430
2022	7,409
2023	7,467
2024	7,371
2025 - 2029	$ 35,721

Stock-Based Compensation and _3

Stock-Based Compensation and Directors Stock Purchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for issuance under the plan	2,249,326
Stock-based compensation	$ 13.9	$ 12.8	$ 12.1
Total tax benefit recognized from compensation arrangements	3	3.2	4.5
Fair value of shares vested during the period	19.9	$ 21.5	$ 23.8
Unrecognized compensation cost related to unvested SAR's and stock awards	$ 27.7
Compensation cost is expected to be recognized over a weighted average period, years	3 years
Common stock dividend rate percentage	5.00%	5.00%
Nonvested Stock Award [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	4 years
Nonvested Stock Award [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	7 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	4 years
Contractual terms of awards granted (in years)	10 years
Directors Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for issuance under the plan	33,914
Number of shares purchased under stock option plan	21,904	32,454
Average price of shares purchased under stock option plan	$ 61.14	$ 54.92

Stock-Based Compensation and _4

Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of The Status Of Nonvested Share Awards) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Nonvested Share Awards [Roll Forward]
Nonvested, share awards, beginning balance	1,239,970
Granted, Shares	217,182
Vested, Shares	(339,618)
Forfeited, Shares	(13,323)
Nonvested, share awards, ending balance	1,104,211	1,239,970
Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance	$ 47.57	$ 41.18
Granted, Weighted Average Grant Date Fair Value		58.82
Vested, Weighted Average Grant Date Fair Value		31.33
Forfeited, Weighted Average Grant Date Fair Value		47.41
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance		$ 47.57

Stock-Based Compensation and _5

Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of SAR Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares
Stock Appreciation Rights, Shares [Roll Forward]
Outstanding, Shares, Beginning Balance | shares	1,119,405
Granted, Shares | shares	196,129
Forfeited, Shares | shares	(5,935)
Expired, Shares | shares	(1,917)
Exercised, Shares | shares	(257,866)
Outstanding, Shares, Ending Balance | shares	1,049,816
Exercisable, Shares, Ending Balance | shares	557,763
Stock Appreciation Rights, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 38.30
Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price | $ / shares	58.82
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price | $ / shares	49.67
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price | $ / shares	37
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price | $ / shares	32.30
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	43.55
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 36.16
Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $	$ 25,601
Exercisable, Weighted Average Remaining Contractual Term (in years)	5 years 3 months 18 days
Exercisable, Aggregate Intrinsic Value, Ending Balance | $	$ 17,728

Stock-Based Compensation and _6

Stock-Based Compensation and Directors Stock Purchase Plan Share Based Compensation Valuation Assumptions [Table] (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 11.35	$ 11.28	$ 10.83
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.70%	1.60%	1.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	19.80%	20.60%	21.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.60%	2.70%	2.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years	6 years 7 months 6 days	7 years

Stock-Based Compensation and _7

Stock-Based Compensation and Directors Stock Purchase Plan Stock-Based Compensation and Directors Stock Purchase Plan (Additional Information About Stock Options and SARs Exercises) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Noncash Expense [Abstract]
Intrinsic value of options and SARs exercised	$ 7,109	$ 9,632	$ 9,310
Tax benefit realized from options and SARs exercised	$ 1,385	$ 1,928	$ 2,698

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		$ 110,444		$ (64,669)		$ 14,108
Other Comprehensive Income (Loss), before Reclassifications, before Tax		227,325		(66,892)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		6,158		2,377
Other Comprehensive Income (Loss), before Tax		233,483		(64,515)
Other Comprehensive Income (Loss), Tax		(58,370)		16,126
Other comprehensive income (loss)		175,113		(48,389)		3,133
Reclassification Where Impairment Was Not Previously Recognized		0		0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		3,264	[1]	3,861	[1]	3,411
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(975)		(438)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		133		68
Other Comprehensive Income (Loss), before Tax		(842)		(370)
Other Comprehensive Income (Loss), Tax		210		93
Other comprehensive income (loss)		(632)		(277)
Reclassification Where Impairment Was Not Previously Recognized		35		12
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		98,809	[1]	(52,278)	[1]	30,326
Other Comprehensive Income (Loss), before Reclassifications, before Tax		201,280		(73,725)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		215		(447)
Other Comprehensive Income (Loss), before Tax		201,495		(74,172)
Other Comprehensive Income (Loss), Tax		(50,373)		18,541
Other comprehensive income (loss)		151,122		(55,631)
Reclassification Where Impairment Was Not Previously Recognized		(35)		(12)
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		(21,940)		(23,107)		(19,629)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(461)		(1,110)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		2,017		1,996
Other Comprehensive Income (Loss), before Tax		1,556		886
Other Comprehensive Income (Loss), Tax		(389)		(222)
Other comprehensive income (loss)		1,167		664
Reclassification Where Impairment Was Not Previously Recognized		0		0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[2]	30,311		6,855		$ 0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[2]	27,481		8,381
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	3,793		760
Other Comprehensive Income (Loss), before Tax	[2]	31,274		9,141
Other Comprehensive Income (Loss), Tax	[2]	(7,818)		(2,286)
Other comprehensive income (loss)	[2]	23,456		6,855
Reclassification Where Impairment Was Not Previously Recognized	[2]	$ 0		0
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				2,932
Accounting Standards Update 2018-02 [Member] | Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				715
Accounting Standards Update 2018-02 [Member] | Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				6,359
Accounting Standards Update 2018-02 [Member] | Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(4,142)
Accounting Standards Update 2018-02 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	[2]			0
Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(33,320)
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(33,320)
Accounting Standards Update 2016-01 [Member] | Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Accounting Standards Update 2016-01 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	[2]			$ 0
[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 (Schedule Of Financial

Segments (Schedule Of Financial Information By Segment) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2019USD ($)Operating_Segments	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Operating_Segments		3
Net interest income		$ 821,293	$ 823,825	$ 733,679
Provision for loan losses		(50,438)	(42,694)	(45,244)
Non-interest income		524,703	501,341	461,263
Investment securities gains (losses), net	[1]	3,626	(488)	25,051
Non-interest expense		(767,398)	(737,821)	(744,343)
Income before income taxes		531,786	544,163	430,406
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		315,782	294,798	276,891
Provision for loan losses		(44,987)	(40,571)	(40,619)
Non-interest income		135,257	126,253	121,362
Investment securities gains (losses), net		0	0	0
Non-interest expense		(297,581)	(286,181)	(274,225)
Income before income taxes		108,471	94,299	83,409
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		342,736	344,972	329,087
Provision for loan losses		(4,204)	(1,134)	205
Non-interest income		203,952	202,527	184,577
Investment securities gains (losses), net		0	0	0
Non-interest expense		(308,686)	(297,847)	(281,845)
Income before income taxes		233,798	248,518	232,024
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		48,058	46,946	47,264
Provision for loan losses		(174)	32	(41)
Non-interest income		183,589	173,026	158,175
Investment securities gains (losses), net		0	0	0
Non-interest expense		(124,123)	(123,568)	(120,461)
Income before income taxes		107,350	96,436	84,937
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		706,576	686,716	653,242
Provision for loan losses		(49,365)	(41,673)	(40,455)
Non-interest income		522,798	501,806	464,114
Investment securities gains (losses), net		0	0	0
Non-interest expense		(730,390)	(707,596)	(676,531)
Income before income taxes		449,619	439,253	400,370
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income		114,717	137,109	80,437
Provision for loan losses		(1,073)	(1,021)	(4,789)
Non-interest income		1,905	(465)	(2,851)
Investment securities gains (losses), net		3,626	(488)	25,051
Non-interest expense		(37,008)	(30,225)	(67,812)
Income before income taxes		$ 82,167	$ 104,910	$ 30,036
[1]	Available for sale debt securities, equity securities, and other securities.

Segments Segments (Segment Bala

Segments Segments (Segment Balance Sheet Data) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Average Assets	$ 25,213,525	$ 24,666,235
Average Loans, including held for sale	14,243,214	13,945,572
Average Goodwill and other intangible assets	147,910	147,108
Average Deposits	19,909,891	20,131,252
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	2,375,326	2,481,060
Average Loans, including held for sale	2,239,100	2,346,166
Average Goodwill and other intangible assets	79,055	78,062
Average Deposits	10,236,257	10,210,502
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	9,486,074	9,115,738
Average Loans, including held for sale	9,250,645	8,939,696
Average Goodwill and other intangible assets	68,109	68,300
Average Deposits	7,848,367	8,029,248
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	1,288,806	1,243,806
Average Loans, including held for sale	1,276,839	1,233,780
Average Goodwill and other intangible assets	746	746
Average Deposits	1,832,418	1,871,596
Segment Totals [Member]
Segment Reporting Information [Line Items]
Average Assets	13,150,206	12,840,604
Average Loans, including held for sale	12,766,584	12,519,642
Average Goodwill and other intangible assets	147,910	147,108
Average Deposits	19,917,042	20,111,346
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Average Assets	12,063,319	11,825,631
Average Loans, including held for sale	1,476,630	1,425,930
Average Goodwill and other intangible assets	0	0
Average Deposits	$ (7,151)	$ 19,906

Common and Preferred Stock (Nar

Common and Preferred Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 30, 2019	Nov. 01, 2019	Aug. 07, 2019	Apr. 17, 2019
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
AcceleratedShareRepurchaseProgramRepurchaseAmount						$ 150
SharesReceivedUnderAcceleratedShareRepurchaseProgram				438,009		1,994,327
PercentageofTotalSharestobeDelivered						75.00%
Common Stock, Shares Authorized	140,000,000	120,000,000					140,000,000
Common stock dividend rate percentage	5.00%	5.00%
Common stock, par value	$ 5	$ 5
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	356,000	235,000	167,000
Shares available for purchase under the current Board authorization					5,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	4,430,958

Common and Preferred Stock (Sum

Common and Preferred Stock (Summary Of Components Used To Calculate Basic And Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 421,231	$ 433,542	$ 319,383
Preferred Stock Dividends, Income Statement Impact	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 412,231	$ 424,542	$ 310,383
Basic income per common share (in dollars per share)	$ 3.59	$ 3.61	$ 2.63
Diluted income per common share (in dollars per share)	$ 3.58	$ 3.60	$ 2.62
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.	$ 421,231	$ 433,542	$ 319,383
Preferred Stock Dividends, Income Statement Impact	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	412,231	424,542	310,383
Less income allocated to nonvested restricted stockholders	4,019	4,558	3,848
Net income available to common stockholders	$ 408,212	$ 419,984	$ 306,535
Weighted average common shares outstanding	113,784	116,352	116,375
Basic income per common share (in dollars per share)	$ 3.59	$ 3.61	$ 2.63
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	$ 412,231	$ 424,542	$ 310,383
Less income allocated to nonvested restricted stockholders	4,012	4,547	3,838
Net income available to common stockholders	$ 408,219	$ 419,995	$ 306,545
Weighted average common shares outstanding	113,784	116,352	116,375
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	282	361	410
Weighted average diluted common shares outstanding	114,066	116,713	116,785
Diluted income per common share (in dollars per share)	$ 3.58	$ 3.60	$ 2.62

Common and Preferred Stock Comm

Common and Preferred Stock Common and Preferred Stock (Schedule of Activity in the Outstanding Shares of the Company's Common Stock) (Details) - Common Stock [Member] - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Common Stock [Roll Forward]
Shares outstanding, beginning balance	111,129	106,615	101,461
Awards and sales under employee and director plans	329	416	403
5% stock dividend	5,359	5,305	5,078
Other purchases of treasury stock	(4,670)	(1,194)	(315)
Other	(15)	(13)	(12)
Shares outstanding, ending balance	112,132	111,129	106,615

Common and Preferred Stock Pref

Common and Preferred Stock Preferred Stock Issuance (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Jun. 19, 2014
Preferred Stock Issuance [Abstract]
Depositary shares issued	6,000,000
Preferred stock, shares issued	6,000	6,000	6,000
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred Stock, Liquidation Preference, Value	$ 150
Preferred Stock, Liquidation Preference Per Share	$ 25

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Schedule Of Capital Amounts And Ratios On Consolidated Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	8.00%
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	6.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Ratio	5.00%
Commerce Bancshares, Inc. (Consolidated) [Member]
Total Capital (to risk-weighted assets), Actual Amount	$ 3,052,079	$ 3,022,023
Total Capital (to risk-weighted assets), Actual Ratio	15.48%	15.82%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,577,105	$ 1,528,317
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%	8.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,890,322	$ 2,861,016
Tier I Capital (to risk-weighted assets), Actual Ratio	14.66%	14.98%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,182,829	$ 1,146,238
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%	6.00%
Tier I Common Capital (to risk-weighted assets), Actual Amount	$ 2,745,538	$ 2,716,232
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	13.93%	14.22%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 887,122	$ 859,678
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%	4.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Amount	$ 2,890,322	$ 2,861,016
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	11.38%	11.52%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 1,015,771	$ 993,564
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Ratio	4.00%	4.00%
Commerce Bank [Member]
Total Capital (to risk-weighted assets), Actual Amount	$ 2,583,676	$ 2,655,591
Total Capital (to risk-weighted assets), Actual Ratio	13.19%	13.98%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,566,866	$ 1,519,169
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,958,583	$ 1,898,962
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%	10.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,421,919	$ 2,494,584
Tier I Capital (to risk-weighted assets), Actual Ratio	12.37%	13.14%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,175,150	$ 1,139,377
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%	6.00%
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,566,866	$ 1,519,169
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	8.00%	8.00%
Tier I Common Capital (to risk-weighted assets), Actual Amount	$ 2,421,919	$ 2,494,584
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	12.37%	13.14%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 881,362	$ 854,533
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%	4.50%
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,273,079	$ 1,234,325
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	6.50%	6.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Amount	$ 2,421,919	$ 2,494,584
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	9.57%	10.07%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 1,012,232	$ 991,185
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Ratio	4.00%	4.00%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Amount	$ 1,265,290	$ 1,238,981
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Ratio	5.00%	5.00%

Revenue from Contracts with C_3

Revenue from Contracts with Customers Revenue from Contracts with Customers (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019Rate
Revenue from Contract with Customer [Abstract]
Percent of Revenue not in scope of ASC 606	61.00%

Revenue from Contracts with C_4

Revenue from Contracts with Customers Revenue from Contracts with Customers (Reclassification of Bank Card Transaction Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 167,879	$ 171,576	$ 155,100
Non-interest income	524,703	501,341	461,263
Data processing and software	92,899	85,978	80,998
Other	63,924	64,304	63,366
Noninterest Expense	$ 767,398	$ 737,821	744,343
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees			180,441
Non-interest income			486,604
Data processing and software			92,246
Other			77,459
Noninterest Expense			769,684
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees			(25,341)
Non-interest income			(25,341)
Data processing and software			(11,248)
Other			(14,093)
Noninterest Expense			(25,341)
Initial Application Period Cumulative Effect Transition [Domain]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees			155,100
Non-interest income			461,263
Data processing and software			80,998
Other			63,366
Noninterest Expense			$ 744,343

Revenue from Contracts with C_5

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Non-interest income	$ 524,703	$ 501,341	$ 461,263
Revenue from Contracts with Customers In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	483,891	467,304	425,077
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Bank Card Transaction Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	167,879	171,576	155,100
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Trust Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	155,628	147,964	135,159
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Deposit Account Charges and Other Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	95,983	94,517	90,060
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Consumer Brokerage Services [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	15,804	15,807	14,630
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Other Non-Interest Income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	48,597	37,440	30,128
Revenue Not In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	$ 40,812	$ 34,037	$ 36,186

Revenue from Contracts with C_6

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Bank Card Transaction Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 13,915	$ 13,035	$ 13,315
Trust Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	2,093	2,721	2,802
Deposit Account Charges and Other Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	6,523	6,107	5,597
Consumer Brokerage Services [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 596	$ 559	$ 380

Revenue from Contracts with C_7

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Bank Card Transaction Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 167,879	$ 171,576	$ 155,100
Debit Card [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	40,025	39,738	35,636
Debit Card [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	42,106	41,522	40,134
Debit Card [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(2,081)	(1,784)	(4,498)
Credit Card [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	14,177	12,965	14,576
Credit Card [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	27,416	26,799	25,275
Credit Card [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(13,239)	(13,834)	(10,699)
Corporate Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	94,388	99,640	84,819
Corporate Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	196,984	199,651	179,642
Corporate Card Fees [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(102,596)	(100,011)	(94,823)
Merchant Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	19,289	19,233	20,069
Merchant Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	31,517	30,241	31,863
Merchant Fees [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(3,449)	(3,177)	(3,566)
Merchant Fees [Member] | Fees to Cardholder Banks [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ (8,779)	$ (7,831)	$ (8,228)

Revenue from Contracts with C_8

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Trust Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Trust Fees [Line Items]
Trust fees	$ 155,628	$ 147,964	$ 135,159
Private Client [Member]
Trust Fees [Line Items]
Trust fees	118,832	111,533	100,358
Institutional [Member]
Trust Fees [Line Items]
Trust fees	29,468	29,241	27,477
Other Trust Fees [Member]
Trust Fees [Line Items]
Trust fees	$ 7,328	$ 7,190	$ 7,324

Revenue from Contracts with C_9

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Deposit Account Charges and Other Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	$ 95,983	$ 94,517	$ 90,060
Corporate Cash Management [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	41,442	38,468	36,044
Overdraft and Return Item [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	30,596	31,468	30,576
Other Deposit Account Charges [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	$ 23,945	$ 24,581	$ 23,440

Revenue from Contracts with _10

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Consumer Brokerage Services) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consumer Brokerage Services [Line Items]
Brokerage Commissions Revenue	$ 15,804	$ 15,807	$ 14,630
Commission Income [Member]
Consumer Brokerage Services [Line Items]
Brokerage Commissions Revenue	9,071	8,956	8,400
Managed Account Services [Member]
Consumer Brokerage Services [Line Items]
Brokerage Commissions Revenue	$ 6,733	$ 6,851	$ 6,230

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments, included in non-marketable securities	$ 94,122	$ 85,659
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	9,900
Private equity investments, included in non-marketable securities	$ 94,122	$ 85,659

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 9,181,000	$ 13,529,000
U.S. government and federal agency obligations	851,776,000	907,652,000
Government-sponsored enterprise obligations	139,277,000	195,778,000
State and municipal obligations	1,267,927,000	1,328,039,000
Agency mortgage-backed securities	3,937,964,000	3,214,985,000
Non-agency mortgage-backed securities	809,782,000	1,047,716,000
Asset-backed securities	1,233,489,000	1,511,614,000
Other debt securities	331,411,000	332,257,000
Trading securities	28,161,000	27,059,000
Equity securities with readily determinable fair values	2,929,000	2,585,000
Private equity investments	94,122,000	85,659,000
Derivative Assets	105,674,000	41,210,000
Deferred Compensation Plan Assets	16,518,000	12,968,000
Total Assets	8,828,211,000	8,721,051,000
Derivative Liability	10,219,000	13,421,000
Deferred Compensation Liability, Current and Noncurrent	16,518,000	12,968,000
Total liabilities	26,737,000	26,389,000
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	851,776,000	907,652,000
Government-sponsored enterprise obligations	0	0
State and municipal obligations	0	0
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Trading securities	0	0
Equity securities with readily determinable fair values	2,929,000	2,585,000
Private equity investments	0	0
Derivative Assets	0	0
Deferred Compensation Plan Assets	16,518,000	12,968,000
Total Assets	871,223,000	923,205,000
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	16,518,000	12,968,000
Total liabilities	16,518,000	12,968,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	9,181,000	13,529,000
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	139,277,000	195,778,000
State and municipal obligations	1,258,074,000	1,313,881,000
Agency mortgage-backed securities	3,937,964,000	3,214,985,000
Non-agency mortgage-backed securities	809,782,000	1,047,716,000
Asset-backed securities	1,233,489,000	1,511,614,000
Other debt securities	331,411,000	332,257,000
Trading securities	28,161,000	27,059,000
Equity securities with readily determinable fair values	0	0
Private equity investments	0	0
Derivative Assets	105,075,000	40,627,000
Deferred Compensation Plan Assets	0	0
Total Assets	7,852,414,000	7,697,446,000
Derivative Liability	9,989,000	13,328,000
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	9,989,000	13,328,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	0	0
State and municipal obligations	9,853,000	14,158,000
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Trading securities	0	0
Equity securities with readily determinable fair values	0	0
Private equity investments	94,122,000	85,659,000
Derivative Assets	599,000	583,000
Deferred Compensation Plan Assets	0	0
Total Assets	104,574,000	100,400,000
Derivative Liability	230,000	93,000
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	$ 230,000	$ 93,000

Fair Value Measurements (Summ_2

Fair Value Measurements (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 100,307	$ 73,271
Total gains or losses (realized/unrealized) included in earnings	(820)	13,954
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	246	(274)
Investment securities called	(4,635)	(2,616)
Discount accretion	84	32
Purchases of private equity securities	15,706	16,395
Sale / paydown of private equity securities	(6,548)	(371)
Capitalized interest/dividends	32	34
Purchase of risk participation agreement	439	61
Sale of risk participation agreement	(467)	(179)
Ending balance	104,344	100,307
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(1,720)	14,512
State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	14,158	17,016
Total gains or losses (realized/unrealized) included in earnings	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	246	(274)
Investment securities called	(4,635)	(2,616)
Discount accretion	84	32
Purchases of private equity securities	0	0
Sale / paydown of private equity securities	0	0
Capitalized interest/dividends	0	0
Purchase of risk participation agreement	0	0
Sale of risk participation agreement	0	0
Ending balance	9,853	14,158
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	0	0
Private Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	85,659	55,752
Total gains or losses (realized/unrealized) included in earnings	(727)	13,849
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchases of private equity securities	15,706	16,395
Sale / paydown of private equity securities	(6,548)	(371)
Capitalized interest/dividends	32	34
Purchase of risk participation agreement	0	0
Sale of risk participation agreement	0	0
Ending balance	94,122	85,659
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(2,177)	13,849
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	490	503
Total gains or losses (realized/unrealized) included in earnings	(93)	105
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchases of private equity securities	0	0
Sale / paydown of private equity securities	0	0
Capitalized interest/dividends	0	0
Purchase of risk participation agreement	439	61
Sale of risk participation agreement	(467)	(179)
Ending balance	369	490
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 457	$ 663

Fair Value Measurements (Summ_3

Fair Value Measurements (Summary of Gains and Losses on Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	$ (820)	$ 13,954
Change in unrealized gains or losses relating to assets still held at period end	(1,720)	14,512
Loans Fees And Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	(77)	(45)
Change in unrealized gains or losses relating to assets still held at period end	458	535
Other Non-Interest Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	(16)	150
Change in unrealized gains or losses relating to assets still held at period end	(1)	128
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	(727)	13,849
Change in unrealized gains or losses relating to assets still held at period end	$ (2,177)	$ 13,849

Fair Value Measurements (Summ_4

Fair Value Measurements (Summary of Quantitative Information About Level 3 Fair Value Measurements) (Details)	12 Months Ended
	Dec. 31, 2019
Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Discounted Cash Flow, Valuation Techniques	Discounted cash flow
Fair Value, Estimated Market Recovery Period, Years	5 years
Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Market Comparable Companies, Valuation Techniques	Market comparable companies
Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Discounted Cash Flow, Valuation Techniques	Discounted cash flow
Minimum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Recovery Period, Years
Fair Value, Estimated Market Rate, Percent	3.40%
Minimum [Member] | Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	4
Minimum [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	47.80%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	0.00%
Maximum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Rate, Percent	3.70%
Maximum [Member] | Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6
Maximum [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	100.00%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	2.30%
Weighted Average [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average, Probability of Funding	83.70%
Weighted Average, Embedded Servicing Value	1.20%

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	$ 422	$ 294
Collateral dependent impaired loans, Total Gains (Losses)	(263)	(269)
Mortgage servicing rights, fair value	7,749	6,478
Mortgage servicing rights, Total Gains (Losses)	(327)	9
Long Lived Assets Nonrecurring Basis, fair value	1,098	914
Long Lived Assets Nonrecurring Basis Gains (Losses)	(362)	(552)
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	0	0
Mortgage servicing rights, fair value	0	0
Long Lived Assets Nonrecurring Basis, fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	0	0
Mortgage servicing rights, fair value	0	0
Long Lived Assets Nonrecurring Basis, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	422	294
Mortgage servicing rights, fair value	7,749	6,478
Long Lived Assets Nonrecurring Basis, fair value	$ 1,098	$ 914

Fair Value Of Financial Instr_3

Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 9,200
Securities Purchased under Agreements to Resell	850,000	$ 700,000
Interest-bearing Deposits in Banks and Other Financial Institutions	395,850	689,876
Cash and due from banks	491,615	507,892
Derivative Assets	105,674	41,210
Deferred Compensation Plan Assets	16,518	12,968
Total Assets	8,828,211	8,721,051
Non-interest bearing deposits	6,890,687	6,980,298
Savings, interest checking and money market deposits	11,621,716	11,685,239
Certificates of deposit	2,008,012
Other borrowings	2,418	8,702
Derivative Liability	10,219	13,421
Deferred Compensation Liability, Current and Noncurrent	16,518	12,968
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	0	0
Deferred Compensation Plan Assets	16,518	12,968
Total Assets	871,223	923,205
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	16,518	12,968
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	105,075	40,627
Deferred Compensation Plan Assets	0	0
Total Assets	7,852,414	7,697,446
Derivative Liability	9,989	13,328
Deferred Compensation Liability, Current and Noncurrent	0	0
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	599	583
Deferred Compensation Plan Assets	0	0
Total Assets	104,574	100,400
Derivative Liability	230	93
Deferred Compensation Liability, Current and Noncurrent	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	14,737,817	14,140,298
Loans Held-for-sale, Fair Value Disclosure	13,809	20,694
Investments, Fair Value Disclosure	8,741,888	8,698,666
Federal funds sold	0	3,320
Securities Purchased under Agreements to Resell	850,000	700,000
Interest-bearing Deposits in Banks and Other Financial Institutions	395,850	689,876
Cash and due from banks	491,615	507,892
Derivative Assets	105,674	41,210
Deferred Compensation Plan Assets	16,518	12,968
Total Assets	25,353,171	24,814,924
Non-interest bearing deposits	6,890,687	6,980,298
Savings, interest checking and money market deposits	11,621,716	11,685,239
Certificates of deposit	2,008,012	1,658,122
Federal Funds Purchased, Fair Value Disclosure	20,035	13,170
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	1,830,737	1,943,219
Other borrowings	988	8,702
Derivative Liability	10,219	13,421
Deferred Compensation Liability, Current and Noncurrent	16,518	12,968
Financial Liabilities Fair Value Disclosure	22,398,912	22,315,139
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,565,449	5,106,427
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	899,377	869,659
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,833,554	2,875,788
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,354,760	2,127,083
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,964,145	1,955,572
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	349,251	376,399
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	764,977	814,134
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	6,304	15,236
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	14,602,286	13,866,003
Loans Held-for-sale, Fair Value Disclosure	13,809	20,694
Investments, Fair Value Disclosure	8,741,888	8,698,666
Federal funds sold	0	3,320
Securities Purchased under Agreements to Resell	869,592	693,228
Interest-bearing Deposits in Banks and Other Financial Institutions	395,850	689,876
Cash and due from banks	491,615	507,892
Derivative Assets	105,674	41,210
Deferred Compensation Plan Assets	16,518	12,968
Total Assets	25,237,232	24,533,857
Non-interest bearing deposits	6,890,687	6,980,298
Savings, interest checking and money market deposits	11,621,716	11,685,239
Certificates of deposit	2,022,629	1,663,748
Federal Funds Purchased, Fair Value Disclosure	20,035	13,170
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	1,831,518	1,944,458
Other borrowings	988	8,702
Derivative Liability	10,219	13,421
Deferred Compensation Liability, Current and Noncurrent	16,518	12,968
Financial Liabilities Fair Value Disclosure	22,414,310	22,322,004
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,526,303	5,017,694
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	898,152	868,274
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,849,213	2,846,095
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,333,002	2,084,370
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,938,505	1,916,627
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	344,424	365,069
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	708,209	756,651
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,478	11,223
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Loans Held-for-sale, Fair Value Disclosure	0	0
Investments, Fair Value Disclosure	854,705	910,237
Federal funds sold	0	3,320
Securities Purchased under Agreements to Resell	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	395,850	689,876
Cash and due from banks	491,615	507,892
Derivative Assets	0	0
Deferred Compensation Plan Assets	16,518	12,968
Total Assets	1,758,688	2,124,293
Non-interest bearing deposits	6,890,687	6,980,298
Savings, interest checking and money market deposits	11,621,716	11,685,239
Certificates of deposit	0	0
Federal Funds Purchased, Fair Value Disclosure	20,035	13,170
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	0	0
Other borrowings	0	0
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	16,518	12,968
Financial Liabilities Fair Value Disclosure	18,548,956	18,691,675
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Loans Held-for-sale, Fair Value Disclosure	13,809	20,694
Investments, Fair Value Disclosure	7,738,158	7,643,290
Federal funds sold	0	0
Securities Purchased under Agreements to Resell	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Cash and due from banks	0	0
Derivative Assets	105,075	40,627
Deferred Compensation Plan Assets	0	0
Total Assets	7,857,042	7,704,611
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Certificates of deposit	0	0
Federal Funds Purchased, Fair Value Disclosure	0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	0	0
Other borrowings	988	7,751
Derivative Liability	9,989	13,328
Deferred Compensation Liability, Current and Noncurrent	0	0
Financial Liabilities Fair Value Disclosure	10,977	21,079
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	14,602,286	13,866,003
Loans Held-for-sale, Fair Value Disclosure	0	0
Investments, Fair Value Disclosure	149,025	145,139
Federal funds sold	0	0
Securities Purchased under Agreements to Resell	869,592	693,228
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Cash and due from banks	0	0
Derivative Assets	599	583
Deferred Compensation Plan Assets	0	0
Total Assets	15,621,502	14,704,953
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Certificates of deposit	2,022,629	1,663,748
Federal Funds Purchased, Fair Value Disclosure	0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	1,831,518	1,944,458
Other borrowings	0	951
Derivative Liability	230	93
Deferred Compensation Liability, Current and Noncurrent	0	0
Financial Liabilities Fair Value Disclosure	3,854,377	3,609,250
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,526,303	5,017,694
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	898,152	868,274
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,849,213	2,846,095
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,333,002	2,084,370
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,938,505	1,916,627
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	344,424	365,069
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	708,209	756,651
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 4,478	$ 11,223

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Notional Amount	$ 4,525,856	$ 3,254,921
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,500,000	1,000,000
Premium paid for interest rate floor cash flow hedge	$ 31,300
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	7 years
Net unrealized gain (loss) on interest rate floors	$ 40,400
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ (4,100)
Interest Rate Floor [Member] | Interest Rate Floor 1 [Member]
Derivative [Line Items]
Derivative, Floor Interest Rate	2.25%
Derivative, Effective Date	Jan. 1, 2020
Derivative, Maturity Date	Jan. 1, 2026
Interest Rate Floor [Member] | Interest Rate Floor 2 [Member]
Derivative [Line Items]
Derivative, Floor Interest Rate	2.50%
Derivative, Effective Date	Jun. 1, 2020
Derivative, Maturity Date	Jun. 1, 2026
Interest Rate Floor [Member] | Interest Rate Floor 3 [Member]
Derivative [Line Items]
Derivative, Floor Interest Rate	2.00%
Derivative, Effective Date	Dec. 15, 2020
Derivative, Maturity Date	Dec. 15, 2026
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 2,606,181	2,006,280
Variation Margin Impact to Positive Fair Values of Cleared Swaps	(617)	(8,100)
Variation Margin Impact to Negative Fair Values of Cleared Swaps	$ (28,500)	$ (6,500)

Derivative Instruments (Schedul

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Notional Amount	$ 4,525,856	$ 3,254,921
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,606,181	2,006,280
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,500,000	1,000,000
Interest Rate Caps [Member]
Derivative [Line Items]
Derivative, Notional Amount	59,316	62,163
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Derivative, Notional Amount	316,225	143,460
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	10,936	6,206
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	13,755	14,544
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,943	5,768
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 17,500	$ 16,500

Derivative Instruments (Sched_2

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Other assets	$ 105,674	$ 41,210
Other liabilities	(10,219)	(13,421)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	67,192	29,031
Other liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Derivatives, Fair Value [Line Items]
Other assets	67,192	29,031
Other liabilities	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	38,482	12,179
Other liabilities	(10,219)	(13,421)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	37,774	11,537
Other liabilities	(9,916)	(13,110)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	4	24
Other liabilities	(4)	(24)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	140	47
Other liabilities	(230)	(93)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	97	20
Other liabilities	(32)	(8)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	459	536
Other liabilities	0	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	6	15
Other liabilities	(2)	(8)
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	2	0
Other liabilities	$ (35)	$ (178)

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Summary of Cash Flow Hedge Activity) (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 27,481	$ 8,381
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	50,327	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	(22,846)	8,381
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(3,793)	(760)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	(3,793)	(760)
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	27,481	8,381
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	50,327	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax	(22,846)	8,381
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	(3,793)	(760)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	$ (3,793)	$ (760)

Derivative Instruments (Summary

Derivative Instruments (Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 3,852	$ 4,480	$ 1,580
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	4,732	3,914	1,978
Other Non-Interest Income [Member] | Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	0	11	0
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(16)	150	35
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	53	31	(80)
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(77)	(45)	231
Loans Fees And Sales [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(3)	5	64
Loans Fees And Sales [Member] | Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (837)	$ 414	$ (648)

Derivative Instruments Deriva_2

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	$ 105,674	$ 41,210
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Assets	105,674	41,210
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	10,219	13,421
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability	10,219	13,421
Derivative Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	105,147	40,613
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Noncurrent	105,147	40,613
Derivative Asset, Not Offset, Policy Election Deduction	(8,104)	(2,992)
Derivative Asset, Fair Value of Collateral	(59,525)	(26,174)
Derivative Asset, Fair Value, Amount Offset Against Collateral	37,518	11,447
Derivative Liability, Fair Value, Gross Liability	10,083	13,333
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Noncurrent	10,083	13,333
Derivative Liability, Not Offset, Policy Election Deduction	(8,104)	(2,992)
Derivative Liability, Fair Value of Collateral	(437)	(261)
Derivative Liability, Fair Value, Amount Offset Against Collateral	1,542	10,080
Derivative Not Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	527	597
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	527	597
Derivative Liability, Fair Value, Gross Liability	136	88
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 136	$ 88

Resale and Repurchase Agreeme_3

Resale and Repurchase Agreements (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Collateral swap agreements	$ 200	$ 450
Collateral Already Posted, Aggregate Fair Value	204.3
Collateral Accepted, Aggregate Fair Value	$ 209.6

Resale and Repurchase Agreeme_4

Resale and Repurchase Agreements Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	$ 1,050,000	$ 1,150,000
Securities Purchased under Agreements to Resell, Liability	(200,000)	(450,000)
Securities purchased under agreements to resell, net	850,000	700,000
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)	(700,000)
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	2,030,737	2,393,219
Securities Sold under Agreements to Repurchase, Asset	(200,000)	(450,000)
Securities sold under agreements to repurchase, net	1,830,737	1,943,219
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	(1,830,737)	(1,943,219)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0

Resale and Repurchase Agreeme_5

Resale and Repurchase Agreements Schedule of Underlying Assets of Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Maturity Overnight [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 526,283	$ 387,541
Maturity Overnight [Member] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	32,575	18,466
Maturity Overnight [Member] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	973,774	882,744
Maturity Overnight [Member] | Non-agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	71,399	187,740
Maturity Overnight [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	60,012	322,680
Maturity Overnight [Member] | Other Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	50,375	98,522
Maturity Overnight [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,714,418	1,897,693
Maturity up to 90 days [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	150,000
Maturity up to 90 days [Member] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity up to 90 days [Member] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	48,517	31,774
Maturity up to 90 days [Member] | Non-agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity up to 90 days [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	40,000	0
Maturity up to 90 days [Member] | Other Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity up to 90 days [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	88,517	181,774
Maturity Greater than 90 Days [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	100,000
Maturity Greater than 90 Days [Member] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity Greater than 90 Days [Member] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	227,802	213,752
Maturity Greater than 90 Days [Member] | Non-agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity Greater than 90 Days [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity Greater than 90 Days [Member] | Other Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Maturity Greater than 90 Days [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	227,802	313,752
Total Repurchase Agreements [Member] [Domain] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	526,283	637,541
Total Repurchase Agreements [Member] [Domain] | US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	32,575	18,466
Total Repurchase Agreements [Member] [Domain] | Agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,250,093	1,128,270
Total Repurchase Agreements [Member] [Domain] | Non-agency mortgage-backed securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	71,399	187,740
Total Repurchase Agreements [Member] [Domain] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	100,012	322,680
Total Repurchase Agreements [Member] [Domain] | Other Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	50,375	98,522
Total Repurchase Agreements [Member] [Domain] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 2,030,737	$ 2,393,219

Commitments, Contingencies An_3

Commitments, Contingencies And Guarantees (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Outstanding purchase commitments expected to fund in the next 12 months	$ 160,900
Notional amount of underlying swaps	4,525,856	$ 3,254,921
Financial Standby Letter of Credit [Member]
Carrying value of the guarantee obligations, liability	2,600
Commitments outstanding	377,338	$ 353,905
State Tax Credits [Member]
Purchases of state tax credits	90,600
Sales of state tax credits	84,900
Risk Participation Agreement [Member]
Carrying value of the guarantee obligations, liability	230
Notional amount of underlying swaps	$ 208,900
Risk Participation Agreement [Member] | Minimum [Member]
Risk Participation Agreements, Term	3 years
Risk Participation Agreement [Member] | Maximum [Member]
Risk Participation Agreements, Term	11 years

Commitments, Contingencies An_4

Commitments, Contingencies And Guarantees (Schedule Of Off-Balance Sheet Instruments Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commercial letters of credit	$ 7,050	$ 13,774
Credit Card [Member]
Commitments to extend credit	5,063,166	5,328,502
Other [Member]
Commitments to extend credit	6,123,264	5,840,967
Financial Standby Letter of Credit [Member]
Standby letters of credit, net of participations	$ 377,338	$ 353,905

Related Parties (Narrative) (De

Related Parties (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tower Property [Member]
Percentage of Tower stock owned by the Company's Executive Officers	67.00%
Company stock owned by Tower	211,996
Tower's long-term line of credit with the Bank	$ 13,500,000
Tower's line of credit, maximum borrowing amount (based on collateral)	11,500,000
Tower's maximum amount outstanding on the line of credit during period	0	$ 0	$ 5,200,000
Tower's line of credit, current balance	0	0	0
Tower's letters of credit outstanding, amount	0	0	0
Tower's line of credit facility, commitment fee amount	0	0	0
Tower's long-term construction loan	0	0	0
Rent paid to the Company by Tower	$ 75,000	$ 74,000	$ 74,000
Rent per square foot	17	16.69	15.75
Executive Chairman [Member]
State tax credits sold by the Company to related party	$ 865,000	$ 831,000	$ 694,000
Former Vice Chairman [Member]
State tax credits sold by the Company to related party	663,000	759,000	598,000
Chief Executive Officer [Member]
State tax credits sold by the Company to related party	166,000	119,000	67,000
Chief Credit Officer [Member]
State tax credits sold by the Company to related party	$ 83,000	$ 0	$ 0

Related Parties (Schedule Of Re

Related Parties (Schedule Of Related Party Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total	$ 2,733	$ 2,480	$ 2,446
Leasing Agent Fees [Member]
Total	154	133	32
Operation Of Parking Garages [Member]
Total	118	95	82
Building Management Fees [Member]
Total	2,001	1,935	1,954
Property Construction Management Fees [Member]
Total	250	136	146
Dividends Paid On Company Stock Held By Tower [Member]
Total	$ 210	$ 181	$ 232

Parent Company Condensed Fina_3

Parent Company Condensed Financial Statements (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments in marketable common and preferred stock	$ 2,929,000	$ 2,585,000
Non-agency mortgage-backed securities	809,782,000	1,047,716,000
Commerce Bancshares, Inc. (Parent) [Member]
Note receivable due from bank subsidiary	50,000,000	50,000,000	$ 50,000,000
Parent's line of credit facility with the Bank, maximum borrowing capacity	20,000,000
Parent line of credit with Bank, borrowings during period	0	$ 0	$ 0
Investments in marketable common and preferred stock	2,800,000
Equity Securities without Readily Determinable Fair Value, Amount	188,000
Non-agency mortgage-backed securities	$ 1,400,000

Parent Company Condensed Fina_4

Parent Company Condensed Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Securities, FV-NI and without Readily Determinable Fair Value	$ 4,209	$ 4,409
Other assets	476,400	382,194
Total assets	26,065,789	25,463,842
Other liabilities	553,712	237,943
Total liabilities	22,927,317	22,526,693
Stockholders’ equity	3,134,684	2,931,298
Total liabilities and equity	26,065,789	25,463,842
Commerce Bancshares, Inc. (Parent) [Member]
Investment in consolidated subsidiary, Banks	2,687,692	2,587,489
Investment in consolidated subsidiaries, Non-banks	71,290	67,538
Cash	301,913	207,462
Available for sale securities	1,399	2,576
Equity Securities, FV-NI and without Readily Determinable Fair Value	2,969	3,191
Note receivable due from bank subsidiary	50,000	50,000	$ 50,000
Advances to subsidiaries, net of borrowings	26,097	19,867
Income tax benefits	9,973	8,590
Other assets	23,528	23,734
Total assets	3,174,861	2,970,447
Pension obligation	13,028	12,645
Other liabilities	27,149	26,504
Total liabilities	40,177	39,149
Stockholders’ equity	3,134,684	2,931,298
Total liabilities and equity	$ 3,174,861	$ 2,970,447

Parent Company Condensed Fina_5

Parent Company Condensed Financial Statements (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividends on investment securities	$ 237,487	$ 240,187	$ 214,689
Salaries and employee benefits	492,927	468,194	448,321
Data processing fees paid to affiliates	92,899	85,978	80,998
Community Service	2,446	2,445	34,377
Other	63,924	64,304	63,366
Total non-interest expense	767,398	737,821	744,343
Income tax expense (benefit)	109,074	105,949	110,506
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	421,231	433,542	319,383
Commerce Bancshares, Inc. (Parent) [Member]
Dividends received from consolidated subsidiary banks	500,000	200,000	160,002
Earnings of consolidated subsidiaries, net of dividends	(79,641)	233,785	147,678
Interest and dividends on investment securities	1,698	10,698	2,099
Management fees charged subsidiaries	36,776	37,688	30,431
Investment securities gains (losses)	3,572	(4,581)	41,717
Net interest income on advances and note to subsidiaries	1,208	1,299	514
Other	4,700	2,390	3,346
Total income	468,313	481,279	385,787
Salaries and employee benefits	32,882	33,588	33,714
Professional fees	2,050	2,383	2,036
Data processing fees paid to affiliates	3,142	3,341	3,512
Community Service	87	152	32,093
Other	13,019	10,729	10,671
Total non-interest expense	51,180	50,193	82,026
Income tax expense (benefit)	(4,098)	(2,456)	(15,622)
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	$ 421,231	$ 433,542	$ 319,383

Parent Company Condensed Fina_6

Parent Company Condensed Financial Statements (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES:
Net income		$ 422,712	$ 438,214	$ 319,900
Other changes, net		(73,363)	(5,992)	(13,259)
Net cash provided by (used in) operating activities		512,794	552,660	426,527
INVESTING ACTIVITIES
Proceeds from sales of available for sale securities	[1]	413,203	708,864	792,380
Proceeds from maturities/pay downs of available for sale securities	[1]	1,558,244	1,510,985	1,899,640
Purchases of investment securities	[1]	(1,863,180)	(2,090,333)	(1,853,817)
Purchases of land, buildings and equipment		(42,575)	(33,294)	(30,824)
Net cash provided by (used in) investing activities		(730,165)	(91,024)	220,720
FINANCING ACTIVITIES
Purchases of treasury stock		(134,904)	(75,231)	(17,771)
Accelerated stock repurchase agreement		(150,000)	0	0
Cash dividends paid on common stock		(113,466)	(100,238)	(91,619)
Cash dividends paid on preferred stock		(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities		(84,061)	223,252	(924,536)
Increase (decrease) in cash and cash equivalents		(301,432)	684,888	(277,289)
Income tax payments (receipts), net		76,168	84,172	120,744
Commerce Bancshares, Inc. (Parent) [Member]
OPERATING ACTIVITIES:
Net income		421,231	433,542	319,383
Earnings of consolidated subsidiaries, net of dividends		79,641	(233,785)	(147,678)
Other changes, net		2,491	2,505	(11,268)
Net cash provided by (used in) operating activities		503,363	202,262	160,437
INVESTING ACTIVITIES
(Increase) decrease in securities purchased under agreements to resell		0	0	155,775
(Increase) decrease in investment in subsidiaries, net		(12)	0	11
Proceeds from sales of available for sale securities		3,856	41,638	11,006
Proceeds from maturities/pay downs of available for sale securities		1,150	1,988	2,295
Purchases of investment securities		(63)	(125)	0
Origination of Notes Receivable from Related Parties		0	0	(50,000)
(Increase) decrease in advances to subsidiaries, net		(6,230)	(5,296)	(9,518)
Purchases of land, buildings and equipment		(235)	(133)	(52)
Net cash provided by (used in) investing activities		(1,534)	38,072	109,517
FINANCING ACTIVITIES
Purchases of treasury stock		(134,904)	(75,231)	(17,771)
Accelerated stock repurchase agreement		(150,000)	0	0
Issuance of stock under equity compensation plans		(8)	(10)	(8)
Cash dividends paid on common stock		(113,466)	(100,238)	(91,619)
Cash dividends paid on preferred stock		(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities		(407,378)	(184,479)	(118,398)
Increase (decrease) in cash and cash equivalents		94,451	55,855	151,556
Cash and cash equivalents at beginning of year		207,462	151,607	51
Cash and cash equivalents at end of year		301,913	207,462	151,607
Income tax payments (receipts), net		$ (2,337)	$ (1,965)	$ (8,991)
[1]	Available for sale debt securities, equity securities, and other securities.