Commerce Bancshares (CBSH) 10-K 21 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 14, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Type	10-K
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Registrant Name	COMMERCE BANCSHARES INC /MO/
Entity Central Index Key	22,356
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		110,901,627
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Small Business	false
Entity Public Float			$ 6,364,000,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Loans	$ 14,140,298	$ 13,983,674
Allowance for loan losses	(159,932)	(159,532)
Net loans	13,980,366	13,824,142
Loans held for sale	20,694	21,398
Investment securities:
Debt Securities, Available-for-sale	8,538,041	8,725,442
Trading	27,059	18,269
Equity Securities, FV-NI and without Readily Determinable Fair Value	4,409	50,591
Other Securities	129,157	99,005
Total investment securities	8,698,666	8,893,307
Federal funds sold and short-term securities purchased under agreements to resell	3,320	42,775
Long-term securities purchased under agreements to resell	700,000	700,000
Interest-bearing Deposits in Banks and Other Financial Institutions	689,876	30,631
Cash and due from banks	507,892	438,439
Land, buildings and equipment – net	333,119	335,110
Goodwill	138,921	138,921
Other intangible assets – net	8,794	7,618
Other assets	382,194	401,074
Total assets	25,463,842	24,833,415
LIABILITIES AND STOCKHOLDERS’ EQUITY
Non-interest bearing	6,980,298	7,158,962
Savings, interest checking and money market	11,685,239	11,499,620
Time open and C.D.’s of less than $100,000	586,091	634,646
Time open and C.D.'s of $100,000 and over	1,072,031	1,132,218
Total deposits	20,323,659	20,425,446
Federal funds purchased and securities sold under agreements to repurchase	1,956,389	1,507,138
Other borrowings	8,702	1,758
Other liabilities	237,943	180,889
Total liabilities	22,526,693	22,115,231
Commerce Bancshares, Inc. stockholders’ equity:
Preferred stock, $1 par value	144,784	144,784
Common stock, $5 par value	559,432	535,407
Capital surplus	2,084,824	1,815,360
Retained earnings	241,163	221,374
Treasury stock, at cost	(34,236)	(14,473)
Accumulated other comprehensive income	(64,669)	14,108
Total Commerce Bancshares, Inc. stockholders’ equity	2,931,298	2,716,560
Non-controlling interest	5,851	1,624
Total equity	2,937,149	2,718,184
Total liabilities and equity	$ 25,463,842	$ 24,833,415

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 13,529,000	$ 15,327,000
Investment Securities:
Available for sale securities, pledged	$ 463,325,000	$ 662,515,000
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	120,000,000	120,000,000
Common stock, shares issued	11,886,450	107,081,397
Treasury stock, shares	555,100	276,968

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Interest and fees on loans	$ 625,083	$ 543,825	$ 489,956
Interest on loans held for sale	1,298	1,000	1,317
Interest on investment securities	240,187	214,689	207,184
Interest on federal funds sold and short-term securities purchased under agreements to resell	519	230	78
Interest on long-term securities purchased under agreements to resell	15,881	15,440	13,544
Interest on deposits with banks	6,233	2,223	973
Total interest income	889,201	777,407	713,052
INTEREST EXPENSE
Savings, interest checking and money market	27,803	17,309	14,366
Time open and C.D.’s of less than $100,000	3,215	2,645	2,809
Time open and C.D.’s of $100,000 and over	14,658	10,859	8,545
Interest on federal funds purchased and securities sold under agreements to repurchase	19,655	9,829	3,315
Interest on other borrowings	45	3,086	3,968
Total interest expense	65,376	43,728	33,003
Net interest income	823,825	733,679	680,049
Provision for loan losses	42,694	45,244	36,318
Net interest income after provision for loan losses	781,131	688,435	643,731
NON-INTEREST INCOME
Bank card transaction fees	171,576	155,100	154,043
Trust fees	147,964	135,159	121,795
Deposit account charges and other fees	94,517	90,060	86,394
Capital market fees	7,721	7,996	10,655
Consumer brokerage	15,807	14,630	13,784
Loan fees and sales	12,723	13,948	11,412
Other	51,033	44,370	48,473
Total non-interest income	501,341	461,263	446,556
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	(488)	25,051	(53)
NON-INTEREST EXPENSE
Salaries and employee benefits	468,194	448,321	427,310
Net occupancy	46,044	45,612	46,290
Equipment	18,125	18,568	19,141
Supplies and communication	20,637	22,790	24,135
Data processing and software	85,978	80,998	79,589
Marketing	20,548	16,325	16,032
Deposit insurance	11,546	13,986	13,327
Community Service	2,445	34,377	3,906
Other	64,304	63,366	59,499
Total non-interest expense	737,821	744,343	689,229
Income before income taxes	544,163	430,406	401,005
Less income taxes	105,949	110,506	124,151
Net income	438,214	319,900	276,854
Less non-controlling interest expense	4,672	517	1,463
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	433,542	319,383	275,391
Preferred stock dividends	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 424,542	$ 310,383	$ 266,391
Net income per common share - basic (in dollars per share)	$ 3.79	$ 2.77	$ 2.38
Net income per common share - diluted (in dollars per share)	$ 3.78	$ 2.76	$ 2.37

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 438,214	$ 319,900	$ 276,854
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	(277)	412	(341)
Net unrealized gains (losses) on other securities	(55,631)	3,022	(22,422)
Change in pension loss	664	(301)	1,268
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	6,855	0	0
Other comprehensive income (loss)	(48,389)	3,133	(21,495)
Comprehensive income	389,825	323,033	255,359
Non-controlling interest expense	4,672	517	1,463
Comprehensive income attributable to Commerce Bancshares, Inc.	$ 385,153	$ 322,516	$ 253,896

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES:
Net income	$ 438,214	$ 319,900	$ 276,854
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	42,694	45,244	36,318
Provision for depreciation and amortization	38,679	39,732	40,929
Amortization of investment security premiums, net	26,224	35,423	31,493
Deferred income tax (benefit) expense	5,336	13,617	(2,059)
Investment securities (gains) losses, net	488	(25,051)	53
Net gains on sales of loans held for sale	(6,370)	(8,008)	(5,850)
Proceeds from sales of loans held for sale	208,431	215,373	160,875
Origination Of Loans Held For Sale	(203,775)	(216,064)	(163,469)
Net (increase) decrease in trading securities	(14,277)	7,585	73,780
Stock-based compensation	12,841	12,105	11,525
(Increase) decrease in interest receivable	(4,258)	(4,459)	(3,642)
Increase (decrease) in interest payable	2,137	38	1,107
Increase (decrease) in income taxes payable	12,288	(27,685)	4,509
Donation of securities	0	32,036	0
Other changes, net	(5,992)	(13,259)	(7,460)
Net cash provided by (used in) operating activities	552,660	426,527	454,963
INVESTING ACTIVITIES
Proceeds from sales of available for sale securities	708,864	792,380	24,380
Proceeds from maturities/pay downs of available for sale securities	1,510,985	1,899,640	2,032,397
Purchases of available for sale securities	(2,090,333)	(1,853,817)	(1,988,101)
Net (increase) decrease in loans	(200,673)	(614,849)	(1,009,523)
Repayments of long-term securities purchased under agreements to resell	(100,000)	(75,000)	(250,000)
Proceeds from Securities Purchased under Agreements to Resell	100,000	100,000	400,000
Purchases of land, buildings and equipment	(33,294)	(30,824)	(24,478)
Sales of land, buildings and equipment	13,427	3,190	10,112
Net cash provided by (used in) investing activities	(91,024)	220,720	(805,213)
FINANCING ACTIVITIES
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits	60,278	(15,036)	782,846
Net increase (decrease) in time open and C.D.’s	(108,742)	(474,044)	243,199
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase	449,251	(216,767)	(239,647)
Increase (decrease) in other borrowings	6,944	(100,291)	(1,769)
Purchases of treasury stock	(75,231)	(17,771)	(39,381)
Issuance of stock under equity compensation plans	(10)	(8)	(6)
Cash dividends paid on common stock	(100,238)	(91,619)	(87,070)
Cash dividends paid on preferred stock	(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities	223,252	(924,536)	649,172
Increase (decrease) in cash and cash equivalents	684,888	(277,289)	298,922
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Year	524,352	801,641	502,719
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Year	1,209,240	524,352	801,641
Supplemental Cash Flow Information:
Income tax payments, net	84,172	120,744	119,596
Interest paid on deposits and borrowings	63,239	43,690	31,896
Real Estate Owned, Transfer to Real Estate Owned	1,551	2,063	1,122
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 0	$ 0	$ 42,688

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
Balance at Dec. 31, 2015	$ 2,367,418	$ 144,784	$ 489,862	$ 1,337,677	$ 383,313	$ (26,116)	$ 32,470	$ 5,428
Net income	276,854				275,391			1,463
Other comprehensive income	(21,495)						(21,495)
Distributions to non-controlling interest	(1,542)							(1,542)
Purchase of treasury stock	(39,381)					(39,381)
Cash dividends paid on common stock	(87,070)				(87,070)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Excess tax benefit related to equity compensation plans	3,390			3,390
Stock-based compensation	11,525			11,525
Issuance under stock purchase and equity compensation plans, net	911			(15,810)		16,721
5% stock dividend, net	(478)		20,153	215,672	(269,785)	33,482
Balance at Dec. 31, 2016	2,501,132	144,784	510,015	1,552,454	292,849	(15,294)	10,975	5,349
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member]	1,297			3,441	(2,144)
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, net	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
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, net	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

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (per share)	$ 0.895	$ 0.816	$ 0.777
Cash dividends paid on preferred stock (per share)	$ 1.500	$ 1.500	$ 1.500
Stock dividend rate (percent)	5.00%	5.00%	5.00%

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
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 320 branch and ATM locations throughout Missouri, Illinois, Kansas, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, credit related insurance and private equity investment activities. 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 $8.2 million and $12.5 million at December 31, 2018 and 2017 , 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, 2018 totaled $228.3 million . Other interest earning cash balances held at the Federal Reserve Bank totaled $689.9 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 borrowers’ 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. Operating, 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. The net investment in operating leases is included in other assets on the Company’s consolidated balance sheets. It is carried at cost, less the amount depreciated to date. Depreciation is recognized on a straight-line basis over the lease term to the estimated residual value. Operating lease revenue consists of the contractual lease payments and is recognized over the lease term in other non-interest income. Estimated residual values are established at lease inception utilizing contract terms, past customer experience, and general market data and are reviewed and adjusted, if necessary, on an annual basis. Investments in Debt and Equity Securities The majority of the Company's investment portfolio is comprised of debt securities which 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 mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine the appropriate estimate of the future rate of prepayment. When a change in a bond's estimated remaining life is necessary, a corresponding adjustment is 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 19, Resale and Repurchase Agreements. Land, Buildings 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. 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 which 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 8, 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 in 2018 the Company 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 16, Fair Value Measurements and Note 18, Derivative Instruments. Pension Plan The Company’s pension plan is described in Note 9, 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 t

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017 are as follows: (In thousands) 2018 2017 Commercial: Business $ 5,106,427 $ 4,958,554 Real estate — construction and land 869,659 968,820 Real estate — business 2,875,788 2,697,452 Personal Banking: Real estate — personal 2,127,083 2,062,787 Consumer 1,955,572 2,104,487 Revolving home equity 376,399 400,587 Consumer credit card 814,134 783,864 Overdrafts 15,236 7,123 Total loans $ 14,140,298 $ 13,983,674 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, 2018 $ 47,225 Additions 127,253 Amounts collected (128,540 ) Amounts written off — Balance, December 31, 2018 $ 45,938 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, 2018 to principal holders (over 10% ownership) of the Company’s common stock. The Company’s lending activity is generally centered in Missouri, Illinois, Kansas 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, 2018 , unfunded loan commitments totaled $11.2 billion (which included $5.3 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, 2018 , loans totaling $3.7 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 $752.2 million and $737.7 million at December 31, 2018 and 2017 , respectively, which is included in business loans on the Company’s consolidated balance sheets. This investment includes deferred income of $62.6 million and $52.1 million at December 31, 2018 and 2017 , respectively. The net investment in operating leases amounted to $16.1 million and $17.4 million at December 31, 2018 and 2017 , 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, 2015 $ 82,086 $ 69,446 $ 151,532 Provision for loan losses 4,898 31,420 36,318 Deductions: Loans charged off 3,258 47,720 50,978 Less recoveries 7,635 11,425 19,060 Net loans charged off (recoveries) (4,377 ) 36,295 31,918 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 (recoveries) 1,089 41,205 42,294 Balance at December 31, 2018 $ 92,869 $ 67,063 $ 159,932 The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2018 and 2017 , 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, 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 December 31, 2017 Commercial $ 3,067 $ 92,613 $ 90,637 $ 8,532,213 Personal Banking 1,176 22,182 64,652 5,336,666 Total $ 4,243 $ 114,795 $ 155,289 $ 13,868,879 Impaired loans The table below shows the Company’s investment in impaired loans at December 31, 2018 and 2017 . 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 under current accounting guidance. 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 on page 78. (In thousands) 2018 2017 Non-accrual loans $ 12,536 $ 11,983 Restructured loans (accruing) 66,080 102,812 Total impaired loans $ 78,616 $ 114,795 The following table provides additional information about impaired loans held by the Company at December 31, 2018 and 2017 , 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, 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 December 31, 2017 With no related allowance recorded: Business $ 5,356 $ 9,000 $ — Real estate – business 1,299 1,303 — Consumer 779 817 — $ 7,434 $ 11,120 $ — With an allowance recorded: Business $ 72,589 $ 73,168 $ 2,455 Real estate – construction and land 837 841 27 Real estate – business 12,532 13,071 585 Real estate – personal 9,126 11,914 532 Consumer 5,388 5,426 67 Revolving home equity 204 204 11 Consumer credit card 6,685 6,685 566 $ 107,361 $ 111,309 $ 4,243 Total $ 114,795 $ 122,429 $ 4,243 Total average impaired loans during 2018 and 2017 are shown in the table below. 2018 2017 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Average impaired loans: Non-accrual loans $ 7,619 $ 2,122 $ 9,741 $ 9,658 $ 3,989 $ 13,647 Restructured loans (accruing) 73,261 16,526 89,787 49,070 17,539 66,609 Total $ 80,880 $ 18,648 $ 99,528 $ 58,728 $ 21,528 $ 80,256 The table below shows interest income recognized during the years ended December 31, 2018 , 2017 and 2016 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously. Years Ended December 31 (In thousands) 2018 2017 2016 Interest income recognized on impaired loans: Business $ 2,219 $ 3,135 $ 1,064 Real estate – construction and land 25 41 2 Real estate – business 558 514 171 Real estate – personal 139 402 152 Consumer 305 307 339 Revolving home equity 3 10 31 Consumer credit card 746 673 722 Total $ 3,995 $ 5,082 $ 2,481 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, 2018 and 2017 . (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, 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 December 31, 2017 Commercial: Business $ 4,949,148 $ 3,085 $ 374 $ 5,947 $ 4,958,554 Real estate – construction and land 967,321 1,473 21 5 968,820 Real estate – business 2,694,234 482 — 2,736 2,697,452 Personal Banking: Real estate – personal 2,050,787 6,218 3,321 2,461 2,062,787 Consumer 2,067,025 32,674 3,954 834 2,104,487 Revolving home equity 397,349 1,962 1,276 — 400,587 Consumer credit card 764,568 10,115 9,181 — 783,864 Overdrafts 6,840 283 — — 7,123 Total $ 13,897,272 $ 56,292 $ 18,127 $ 11,983 $ 13,983,674 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 attached 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, as discussed in Note 1. Commercial Loans (In thousands) Business Real Estate -Construction Real Estate - Business Total 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 December 31, 2017 Pass $ 4,740,013 $ 955,499 $ 2,593,005 $ 8,288,517 Special mention 59,177 10,614 50,577 120,368 Substandard 153,417 2,702 51,134 207,253 Non-accrual 5,947 5 2,736 8,688 Total $ 4,958,554 $ 968,820 $ 2,697,452 $ 8,624,826 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. 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 $201.7 million at December 31, 2018 and $219.2 million at December 31, 2017 . The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $170.3 million at December 31, 2018 and $145.0 million at December 31, 2017 . 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, 2018 and 2017 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card 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 % December 31, 2017 FICO score: Under 600 1.3 % 3.3 % 1.1 % 4.7 % 600 – 659 2.1 5.5 1.7 14.4 660 – 719 10.5 17.3 9.5 34.4 720 – 779 25.6 26.8 21.4 26.0 780 and over 60.5 47.1 66.3 20.5 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. The Company also classified as consumer bankruptcy certain personal real estate, revolving home equity, and consumer loans as 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) 2018 2017 Accruing loans: Commercial $ 50,904 $ 88,588 Assistance programs 7,410 6,941 Consumer bankruptcy 4,103 3,916 Other consumer 3,663 3,367 Non-accrual loans 9,759 7,796 Total troubled debt restructurings $ 75,839 $ 110,608 The table below shows the balance of troubled debt restructurings by loan classification at December 31, 2018 , in addition to the period end 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, 2018 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 48,777 $ 25 Real estate – construction and land 412 — Real estate – business 10,355 — Personal Banking: Real estate – personal 3,636 158 Consumer 5,510 50 Revolving home equity 40 — Consumer credit card 7,109 670 Total troubled debt restructurings $ 75,839 $ 903 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 $1.0 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 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 $1.8 million at December 31, 2018 to lend additional funds to borrowers with restructured loans, compared to $7.6 million at December 31, 2017 . Loans held for sale The Company designates certain long-term fixed rate personal real estate loan originations 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 18. The loans are primarily sold to FNMA, FHLMC, and GNMA. At December 31, 2018 , the fair value of these loans was $13.5 million , and the unpaid principal balance was $13.0 million . The Company also designates certain student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans within 210 days after the last disbursement to the student. These loans are carried at lower of cost or fair value, which at December 31, 2018 totaled $7.2 million . At December 31, 2018, none of the loans held for sale were past due or on non-accrual status. Foreclosed real estate/repossessed assets The Company’s holdings of foreclosed real estate totaled $1.4 million and $681 thousand at December 31, 2018 and 2017 , respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $2.0 million and $2.7 million at December 31, 2018 and 2017 , respectively. Upon acquisition, these assets are recorded at fair value less estimated selling costs at the date of foreclosure, establishing a new cost basis. They are subsequently carried at the lower of this cost basis or fair value less estimated selling costs.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities as shown in this report reflect revised categories as required by the Company's adoption of ASU 2016-01 "Recognition and Measurement of Financial Assets and Financial Liabilities", on January 1, 2018. That new guidance refined the definition of equity securities and required their segregation from available for sale debt securities. For comparability purposes, prior period disclosures in this report have been revised to show the new categorization. Investment securities, at fair value, consisted of the following at December 31, 2018 and 2017 : 2018 2017 Available for sale debt securities $ 8,538,041 $ 8,725,442 Trading debt securities 27,059 18,269 Equity securities: Readily determinable fair value 2,585 48,838 No readily determinable fair value 1,824 1,753 Other: Federal Reserve Bank stock 33,498 33,253 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 85,659 55,752 Total investment securities $ 8,698,666 $ 8,893,307 While changes in the fair value of available for sale debt securities continue to be recorded in the equity category of accumulated other comprehensive income, the new guidance requires changes in the fair value of equity securities to be recorded in current earnings. Also, the unrealized gain of $33.3 million (net of tax) on fair value on equity securities, which was previously recorded in accumulated other comprehensive income at December 31, 2017, was reclassified to retained earnings on January 1, 2018. Equity securities include common and preferred stock with readily determinable fair values that totaled $2.5 million at cost and $2.6 million at fair value at December 31, 2018 . The decline in these balances from prior periods was due to a third party merger transaction in June 2018, in which the majority of these securities were redeemed for cash of $39.9 million . During the year ended 2018 , unrealized net losses of $332 thousand were recognized in current earnings on equity securities still held at December 31, 2018 . Equity securities also include securities with a carrying value of $1.8 million that do not have readily determinable fair values. The Company has elected, under the ASU, 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 did not record any impairment or other adjustments to the carrying amount of these investments during the period. Other investment securities whose accounting is not addressed in the ASU 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, 2018 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, 2018 . 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. The Company does not have exposure to subprime-originated mortgage-backed or collateralized debt obligation instruments, and does not hold any trust preferred securities. (Dollars in thousands) Amortized Cost Fair Value Weighted Average Yield U.S. government and federal agency obligations: Within 1 year $ 23,577 $ 23,518 (.04 )*% After 1 but within 5 years 434,973 435,690 1.90 * After 5 but within 10 years 386,708 381,419 1.61 * After 10 years 69,228 67,025 .64 * Total U.S. government and federal agency obligations 914,486 907,652 1.63 * Government-sponsored enterprise obligations: Within 1 year 24,991 24,743 1.53 After 1 but within 5 years 96,601 95,619 2.03 After 5 but within 10 years 34,985 34,460 2.71 After 10 years 42,893 40,956 3.10 Total government-sponsored enterprise obligations 199,470 195,778 2.32 State and municipal obligations: Within 1 year 98,429 98,675 2.45 After 1 but within 5 years 656,762 659,525 2.37 After 5 but within 10 years 493,994 496,997 2.58 After 10 years 73,600 72,842 3.22 Total state and municipal obligations 1,322,785 1,328,039 2.50 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,253,433 3,214,985 2.85 Non-agency mortgage-backed securities 1,053,854 1,047,716 2.85 Asset-backed securities 1,518,976 1,511,614 2.62 Total mortgage and asset-backed securities 5,826,263 5,774,315 2.79 Other debt securities: Within 1 year 16,500 16,418 After 1 but within 5 years 249,870 245,319 After 5 but within 10 years 73,225 70,520 Total other debt securities 339,595 332,257 Total available for sale debt securities $ 8,602,599 $ 8,538,041 * 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 $434.4 million , at fair value, at December 31, 2018 . 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 $14.2 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 accumulated other comprehensive income, by security type. (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value 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 December 31, 2017 U.S. government and federal agency obligations $ 917,494 $ 4,096 $ (4,443 ) $ 917,147 Government-sponsored enterprise obligations 408,266 26 (1,929 ) 406,363 State and municipal obligations 1,592,707 21,413 (2,754 ) 1,611,366 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,046,701 17,956 (23,744 ) 3,040,913 Non-agency mortgage-backed securities 903,920 6,710 (4,837 ) 905,793 Asset-backed securities 1,495,380 2,657 (5,237 ) 1,492,800 Total mortgage and asset-backed securities 5,446,001 27,323 (33,818 ) 5,439,506 Other debt securities 350,988 1,250 (1,178 ) 351,060 Total $ 8,715,456 $ 54,108 $ (44,122 ) $ 8,725,442 The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis and analysis 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 have been identified based on management’s judgment. These securities are placed on a watch list, and for all such securities, detailed cash flow models are prepared which use inputs specific to each security. Inputs to these models include factors such as cash flow received, contractual payments required, and various other information related to the underlying collateral (including current delinquencies), collateral loss severity rates (including loan to values), expected delinquency rates, credit support from other tranches, and prepayment speeds. 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, 2018 , the fair value of securities on this watch list was $57.7 million compared to $68.0 million at December 31, 2017 . As of December 31, 2018 , the Company had recorded OTTI of $14.1 million on certain non-agency mortgage-backed securities with a current par value of $23.4 million . These securities, which are part of the watch list mentioned above, had an aggregate fair value of $18.4 million at December 31, 2018 . 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, 2018 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 8% - 52% Credit support 0% - 20% Loss severity 13% - 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) 2018 2017 2016 Cumulative OTTI credit losses at January 1 $ 14,199 $ 14,080 $ 14,129 Credit losses on debt securities for which impairment was not previously recognized 58 111 — Credit losses on debt securities for which impairment was previously recognized 10 274 270 Increase in expected cash flows that are recognized over remaining life of security (175 ) (266 ) (319 ) Cumulative OTTI credit losses at December 31 $ 14,092 $ 14,199 $ 14,080 Debt securities with unrealized losses recorded in accumulated other comprehensive income 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, 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 December 31, 2017 U.S. government and federal agency obligations $ 618,617 $ 4,443 $ — $ — $ 618,617 $ 4,443 Government-sponsored enterprise obligations 286,393 1,712 49,766 217 336,159 1,929 State and municipal obligations 282,843 1,752 49,339 1,002 332,182 2,754 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,320,689 9,433 619,300 14,311 1,939,989 23,744 Non-agency mortgage-backed securities 577,017 2,966 153,813 1,871 730,830 4,837 Asset-backed securities 786,048 3,168 264,295 2,069 1,050,343 5,237 Total mortgage and asset-backed securities 2,683,754 15,567 1,037,408 18,251 3,721,162 33,818 Other debt securities 144,090 727 20,202 451 164,292 1,178 Total $ 4,015,697 $ 24,201 $ 1,156,715 $ 19,921 $ 5,172,412 $ 44,122 The available for sale debt portfolio included $5.4 billion of securities that were in a loss position at December 31, 2018 , compared to $5.2 billion at December 31, 2017 . The total amount of unrealized loss on these securities was $99.8 million at December 31, 2018, an increase of $55.7 million compared to the loss at December 31, 2017. This increase in losses was mainly due to a rising 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) 2018 2017 2016 Proceeds from sales of securities: Available for sale debt securities $ 667,227 $ 779,793 $ 2,047 Equity securities 41,637 10,953 3,026 Other — 1,634 19,307 Total proceeds $ 708,864 $ 792,380 $ 24,380 Investment securities gains (losses), net: Available for sale debt securities: Losses realized on called bonds $ — $ (254 ) $ — Gains realized on sales 448 592 109 Losses realized on sales (10,101 ) (10,287 ) — Other-than-temporary impairment recognized on debt securities (68 ) (385 ) (270 ) Equity securities: Gains realized on donations of securities — 31,074 — Gains realized on sales 1,759 10,653 1,911 Losses realized on sales (8,917 ) (10 ) (7 ) Fair value adjustments, net 2,542 — — Other: Gains realized on sales — 381 2,442 Losses realized on sales — (880 ) (499 ) Fair value adjustments, net 13,849 (5,833 ) (3,739 ) Total investment securities gains (losses), net $ (488 ) $ 25,051 $ (53 ) Investment securities with a fair value of $4.3 billion and $3.8 billion were pledged at December 31, 2018 and 2017 , respectively, 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 $463.3 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.

Land, Buildings And Equipment

Land, Buildings And Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Land, Buildings And Equipment	Land, Buildings and Equipment Land, buildings and equipment consist of the following at December 31, 2018 and 2017 : (In thousands) 2018 2017 Land $ 91,603 $ 94,992 Buildings and improvements 545,510 540,204 Equipment 226,666 216,876 Total 863,779 852,072 Less accumulated depreciation 530,660 516,962 Net land, buildings and equipment $ 333,119 $ 335,110 Depreciation expense of $28.6 million in 2018 , $29.1 million in 2017 and $30.1 million in 2016 , was included in occupancy expense and equipment expense in the consolidated statements of income. Repairs and maintenance expense of $16.9 million , $16.4 million and $16.2 million for 2018 , 2017 and 2016 , respectively, was included in occupancy expense and equipment expense. There has been no interest expense capitalized on construction projects in the past three years.

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2018
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, 2018 December 31, 2017 ( 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 $ (28,954 ) $ — $ 2,316 $ 31,270 $ (28,305 ) $ — $ 2,965 Mortgage servicing rights 10,339 (3,861 ) — 6,478 7,906 (3,244 ) (9 ) 4,653 Total $ 41,609 $ (32,815 ) $ — $ 8,794 $ 39,176 $ (31,549 ) $ (9 ) $ 7,618 The carrying amount of goodwill and its allocation among segments at December 31, 2018 and 2017 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2018 , 2017 or 2016 . Further, the annual assessment of qualitative factors on January 1, 2019 revealed no likelihood of impairment as of that date. (In thousands) December 31, 2018 December 31, 2017 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, 2018 and 2017 are shown in the following table. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance at December 31, 2016 $ 138,921 $ 3,841 $ 2,868 Originations — — 2,234 Amortization — (876 ) (462 ) Impairment reversal — — 13 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 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 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, 2018 , no temporary impairment 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 16 on Fair Value Measurements. Aggregate amortization expense on intangible assets for the years ended December 31, 2018 , 2017 and 2016 was $1.3 million , $1.3 million and $1.5 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, 2018 . 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) 2019 $ 1,273 2020 1,097 2021 957 2022 842 2023 732

Deposits

Deposits	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Deposits	Deposits At December 31, 2018 , the scheduled maturities of certificates of deposit were as follows: (In thousands) Due in 2019 $ 1,286,425 Due in 2020 281,717 Due in 2021 54,939 Due in 2022 18,301 Due in 2023 15,933 Thereafter 807 Total $ 1,658,122 The following table shows a detailed breakdown of the maturities of certificates of deposit, by size category, at December 31, 2018 . (In thousands) Certificates of Deposit under $100,000 Certificates of Deposit over $100,000 Total Due in 3 months or less $ 116,068 $ 446,300 $ 562,368 Due in over 3 through 6 months 117,046 245,994 363,040 Due in over 6 through 12 months 176,591 184,426 361,017 Due in over 12 months 176,386 195,311 371,697 Total $ 586,091 $ 1,072,031 $ 1,658,122 The aggregate amount of certificates of deposit that exceeded the $250,000 FDIC insurance limit totaled $824.0 million at December 31, 2018 .

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Borrowings	Borrowings At December 31, 2018 , the Company's borrowings primarily consisted of federal funds purchased, securities sold under agreements to repurchase (repurchase agreements), and securities sold short. 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: 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 2016 .4 .3 1,266,093 1,723,905 1,723,905 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, 2018 , and $1.9 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 19 on Resale and Repurchase Agreements. In addition to federal funds purchased and repurchase agreements, the Company's short-term borrowings at December 31, 2018 included $7.8 million of securities sold short. 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, 2018 , 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 $217.4 million at December 31, 2018 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income tax expense from operations for the years ended December 31, 2018 , 2017 and 2016 were as follows: (In thousands) Current Deferred Total 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 Year ended December 31, 2016: U.S. federal $ 116,753 $ (2,036 ) $ 114,717 State and local 9,457 (23 ) 9,434 Total $ 126,210 $ (2,059 ) $ 124,151 The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2018 , 2017 and 2016 were as follows: (In thousands) 2018 2017 2016 Unrealized gain (loss) on available for sale debt securities $ (18,634 ) $ 2,104 $ (13,952 ) Change in fair value on cash flow hedges 2,286 — — Accumulated pension (benefit) loss 222 (184 ) 778 Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes — — (3,390 ) Income tax (benefit) expense allocated to stockholders’ equity $ (16,126 ) $ 1,920 $ (16,564 ) Significant components of the Company’s deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows: (In thousands) 2018 2017 Deferred tax assets: Loans, principally due to allowance for loan losses $ 39,169 $ 40,341 Unrealized loss on available for sale debt securities 16,140 — Equity-based compensation 7,609 8,201 Deferred compensation 5,911 5,647 Unearned fee income 4,125 3,701 Accrued expenses 2,152 5,245 Private equity investments 2,008 5,473 Other 528 4,430 Total deferred tax assets 77,642 73,038 Deferred tax liabilities: Equipment lease financing 55,738 45,825 Unrealized gain on available for sale debt securities — 13,603 Land, buildings and equipment 14,207 8,592 Undistributed earnings of subsidiaries — 7,094 Intangibles 5,973 5,732 Other 5,309 6,569 Total deferred tax liabilities 81,227 87,415 Net deferred tax liabilities $ (3,585 ) $ (14,377 ) 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. As a result of the Tax Cuts and Jobs Act enacted on December 22, 2017, the Company revalued its deferred tax assets and liabilities using the highest maximum corporate tax rate of 21% . This change was reported as a reduction of deferred tax expense. The Company also adopted ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," on January 1, 2017. This adoption required all excess tax benefits and tax deficiencies arising from share-based award payments to be recognized as income tax expense or benefit in the statements of income, while in previous periods these benefits and deficiencies were recognized in equity. In 2018 and 2017, net excess tax benefits resulted from share-based award payments. The effects on federal tax expense of both of these items are shown in the reconciliation below. 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 2018 and 35% in 2017 and 2016. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense. (In thousands) 2018 2017 2016 Computed “expected” tax expense $ 113,293 $ 150,461 $ 139,840 Increase (decrease) in income taxes resulting from: Tax-exempt interest, net of cost to carry (11,502 ) (20,295 ) (20,033 ) Contribution of appreciated securities — (10,864 ) — State and local income taxes, net of federal tax benefit 9,748 5,955 6,132 Tax reform enactment — (6,753 ) — Share-based award payments (3,928 ) (6,613 ) — Other (1,662 ) (1,385 ) (1,788 ) Total income tax expense $ 105,949 $ 110,506 $ 124,151 The gross amount of unrecognized tax benefits was $1.3 million and $1.2 million at December 31, 2018 and 2017, respectively, and the total amount of unrecognized tax benefits that would impact the effective tax rate, if recognized, was $993 thousand and $785 thousand , respectively. The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2018 and 2017 was as follows: (In thousands) 2018 2017 Unrecognized tax benefits at beginning of year $ 1,208 $ 1,228 Gross increases – tax positions in prior period 31 5 Gross increases – current-period tax positions 322 268 Lapse of statute of limitations (304 ) (293 ) Unrecognized tax benefits at end of year $ 1,257 $ 1,208 The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2015 through 2018 remain open to examination for U.S. federal income tax, and tax years 2014 through 2018 remain open to examination in major state taxing jurisdictions.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 2016 Payroll taxes $ 25,712 $ 24,402 $ 23,210 Medical plans 27,030 25,143 25,497 401(k) plan 14,986 14,244 13,562 Pension plans 651 704 987 Other 2,918 2,883 3,214 Total employee benefits $ 71,297 $ 67,376 $ 66,470 The Company adopted ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost”, on January 1, 2018, which required that the service cost component of net periodic pension cost be reported in the same income statement line item as other compensation costs, while other components of net periodic pension cost be reported separately from the service cost component. Historically, the Company has reported all components of pension cost in salaries and employee benefits. Beginning in 2018, only the service cost component has been included in this category, and the other components have been recorded in other non-interest expense. Prior period financial statements have not been revised because the amount of the reclassification was not significant. 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. 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. 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. 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 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 2019 is expected to be zero . The Company does not expect to make any further contributions in 2019 other than the necessary funding contributions to the CERP. Contributions to the CERP were $24 thousand , $439 thousand and $21 thousand during 2018 , 2017 and 2016 , respectively. The following items are components of the net pension cost for the years ended December 31, 2018 , 2017 and 2016 . (In thousands) 2018 2017 2016 Service cost-benefits earned during the year $ 651 $ 621 $ 500 Interest cost on projected benefit obligation 3,756 3,826 3,944 Expected return on plan assets (5,255 ) (5,785 ) (5,751 ) Amortization of prior service cost (271 ) (271 ) (271 ) Amortization of unrecognized net loss 2,267 2,313 2,565 Net periodic pension cost $ 1,148 $ 704 $ 987 The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2018 and 2017 . (In thousands ) 2018 2017 Change in projected benefit obligation Projected benefit obligation at prior valuation date $ 120,667 $ 116,695 Service cost 651 621 Interest cost 3,756 3,826 Benefits paid (6,622 ) (6,780 ) Actuarial (gain) loss (6,389 ) 6,305 Projected benefit obligation at valuation date 112,063 120,667 Change in plan assets Fair value of plan assets at prior valuation date 108,260 99,537 Actual return on plan assets (2,244 ) 9,564 Employer contributions 24 5,939 Benefits paid (6,622 ) (6,780 ) Fair value of plan assets at valuation date 99,418 108,260 Funded status and net amount recognized at valuation date $ (12,645 ) $ (12,407 ) The accumulated benefit obligation, which represents the liability of a plan using only benefits as of the measurement date, was $112.1 million and $120.7 million for the combined plans on December 31, 2018 and 2017 , respectively. Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2018 and 2017 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis. (In thousands) 2018 2017 Prior service cost $ 1,535 $ 1,806 Accumulated loss (32,342 ) (33,499 ) Accumulated other comprehensive loss (30,807 ) (31,693 ) Cumulative employer contributions in excess of net periodic benefit cost 18,162 19,286 Net amount recognized as an accrued benefit liability on the December 31 balance sheet $ (12,645 ) $ (12,407 ) Net loss arising during period (1,110 ) (2,527 ) Amortization of net loss 2,267 2,313 Amortization of prior service cost (271 ) (271 ) Total recognized in other comprehensive income $ 886 $ (485 ) Total expense recognized in net periodic pension cost and other comprehensive income $ (262 ) $ (1,189 ) The estimated net loss and prior service cost to be amortized from accumulated other comprehensive income into net periodic pension cost in 2019 is $2.1 million . The following assumptions, on a weighted average basis, were used in accounting for the plans. 2018 2017 2016 Determination of benefit obligation at year end: Effective discount rate for benefit obligations 4.14 % 3.57 % 4.05 % 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 3.57 % 3.95 % 4.16 % Effective rate for interest on benefit obligations 3.28 % 3.28 % 3.38 % Long-term rate of return on assets 5.00 % 6.00 % 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, 2018 and 2017 . Information about the valuation techniques and inputs used to measure fair value are provided in Note 16 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, 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 $ — December 31, 2017 Assets: U.S. government obligations $ 3,719 $ 3,719 $ — $ — Government-sponsored enterprise obligations (a) 1,282 — 1,282 — State and municipal obligations 8,527 — 8,527 — Agency mortgage-backed securities (b) 7,896 — 7,896 — Non-agency mortgage-backed securities 4,891 — 4,891 — Asset-backed securities 3,833 — 3,833 — Corporate bonds (c) 37,457 — 37,457 — Equity securities and mutual funds: (d) Mutual funds 6,979 6,979 — — Common stocks 23,744 23,744 — — International developed markets funds 7,870 7,870 — — Emerging markets funds 2,062 2,062 — — Total $ 108,260 $ 44,374 $ 63,886 $ — (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 consumer goods 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, 2018 . 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. Effective January 1, 2016, the Company changed the method used to estimate the interest cost component of net periodic pension cost for its defined benefit pension plan. Prior to the change, the interest cost component was estimated by utilizing a single weighted average discount rate derived from the yield curve used to measure the projected benefit obligation. Under the new method, the interest cost component is estimated by applying the specific annual spot rates along the yield curve used in the determination of the projected benefit obligation to the relevant projected cash flows. This change provides a more precise measurement of the interest cost by improving the correlation between projected benefit cash flows and the corresponding spot yield curve rates. The Company accounted for this change prospectively as a change in accounting estimate. The change resulted in a decrease of approximately $900 thousand in the interest cost component of the estimated annual net periodic pension cost for 2016. The assumed overall expected long-term rate of return on pension plan assets used in calculating 2018 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 7.2% . During 2018 , the plan’s assets lost 1.7% of their value, compared to a 9.6% rate of return in 2017 . 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 $2.2 million in 2019 , compared to $1.1 million in 2018 . 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, 2018, the Company utilized an updated mortality projection scale, which decreased the pension benefit obligation on that date by approximately $300 thousand . The following future benefit payments are expected to be paid: (In thousands) 2019 $ 7,163 2020 7,353 2021 7,510 2022 7,473 2023 7,509 2024 - 2028 36,468

Stock-Based Compensation and Di

Stock-Based Compensation and Directors Stock Purchase Plan	12 Months Ended
	Dec. 31, 2018
Share-based Compensation [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 which 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, 2018 , 2,515,678 shares remained available for issuance under the plan. The stock-based compensation expense that was charged against income was $12.8 million , $12.1 million and $11.5 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements was $3.2 million , $4.5 million and $4.3 million for the years ended December 31, 2018 , 2017 and 2016 , 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, 2018 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2018 1,317,092 $ 36.82 Granted 268,658 57.28 Vested (376,489 ) 30.73 Forfeited (28,321 ) 44.12 Canceled — — Nonvested at December 31, 2018 1,180,940 $ 43.24 The total fair value (at vest date) of shares vested during 2018 , 2017 and 2016 was $21.5 million , $23.8 million and $10.9 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 vest ratably over four 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 2018 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, 2018 1,237,804 $ 35.36 Granted 177,001 55.63 Forfeited (17,529 ) 45.82 Expired (607 ) 43.14 Exercised (330,231 ) 29.96 Outstanding at December 31, 2018 1,066,438 $ 40.22 6.7 years $ 17,218 Exercisable at December 31, 2018 561,527 $ 34.57 5.6 years $ 12,239 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. 2018 2017 2016 Weighted per share average fair value at grant date $11.84 $11.37 $6.47 Assumptions: Dividend yield 1.6 % 1.6 % 2.2 % Volatility 20.6 % 21.1 % 21.2 % Risk-free interest rate 2.7 % 2.4 % 1.8 % Expected term 6.6 years 7.0 years 7.2 years Additional information about stock options and SARs exercised is presented below. (In thousands) 2018 2017 2016 Intrinsic value of options and SARs exercised $ 9,632 $ 9,310 $ 8,854 Tax benefit realized from options and SARs exercised $ 1,928 $ 2,698 $ 1,781 As of December 31, 2018 , there was $27.3 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 3.2 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 53,160 at December 31, 2018 . In 2018 , 31,235 shares were purchased at an average price of $57.69 , and in 2017 , 16,666 shares were purchased at an average price of $51.95 . * All share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2018 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2018
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 amortization from other comprehensive income of losses associated with pension benefits, which occurs as the amortization is included in current net periodic benefit cost. The remaining component is gains and losses in fair value on certain interest rate floors that have been designated as cash flow hedging instruments. Unrealized Gains (Losses) on Securities (1) Pension Loss Unrealized Gains (Losses) on Cash Flow Hedge Derivatives (2) Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 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 ) Balance January 1, 2017 $ 2,975 $ 27,328 $ (19,328 ) $ — $ 10,975 Other comprehensive income (loss) before reclassifications 279 36,307 (2,527 ) — 34,059 Amounts reclassified from accumulated other comprehensive income 385 (31,433 ) 2,042 — (29,006 ) Current period other comprehensive income (loss), before tax 664 4,874 (485 ) — 5,053 Income tax (expense) benefit (252 ) (1,852 ) 184 — (1,920 ) Current period other comprehensive income (loss), net of tax 412 3,022 (301 ) — 3,133 Transfer of unrealized gain on securities for which impairment was not previously recognized 24 (24 ) — — — Balance December 31, 2017 $ 3,411 $ 30,326 $ (19,629 ) $ — $ 14,108 (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. As mentioned in Note 1, new accounting guidance for investment securities, 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, 2018
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 investment 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, 2018: Net interest income $ 296,228 $ 345,221 $ 46,946 $ 688,395 $ 135,430 $ 823,825 Provision for loan losses (41,280 ) (1,134 ) 32 (42,382 ) (312 ) (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 (287,473 ) (297,847 ) (123,576 ) (708,896 ) (28,925 ) (737,821 ) Income before income taxes $ 93,728 $ 248,767 $ 96,428 $ 438,923 $ 105,240 $ 544,163 Year ended December 31, 2017: Net interest income $ 279,031 $ 329,087 $ 47,264 $ 655,382 $ 78,297 $ 733,679 Provision for loan losses (41,829 ) 205 (41 ) (41,665 ) (3,579 ) (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 (275,734 ) (281,845 ) (120,461 ) (678,040 ) (66,303 ) (744,343 ) Income before income taxes $ 82,830 $ 232,024 $ 84,937 $ 399,791 $ 30,615 $ 430,406 Year ended December 31, 2016: Net interest income $ 268,654 $ 311,704 $ 44,113 $ 624,471 $ 55,578 $ 680,049 Provision for loan losses (36,042 ) 4,378 (122 ) (31,786 ) (4,532 ) (36,318 ) Non-interest income 116,185 187,350 144,661 448,196 (1,640 ) 446,556 Investment securities losses, net — — — — (53 ) (53 ) Non-interest expense (266,258 ) (272,398 ) (113,888 ) (652,544 ) (36,685 ) (689,229 ) Income before income taxes $ 82,539 $ 231,034 $ 74,764 $ 388,337 $ 12,668 $ 401,005 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 2018: Assets $ 2,541,627 $ 9,115,738 $ 1,243,806 $ 12,901,171 $ 11,765,064 $ 24,666,235 Loans, including held for sale 2,401,657 8,939,696 1,233,780 12,575,133 1,370,439 13,945,572 Goodwill and other intangible assets 78,062 68,300 746 147,108 — 147,108 Deposits 10,210,506 8,029,248 1,871,596 20,111,350 19,902 20,131,252 Average balances for 2017: Assets $ 2,610,045 $ 8,830,584 $ 1,218,598 $ 12,659,227 $ 12,372,381 $ 25,031,608 Loans, including held for sale 2,471,578 8,635,035 1,209,792 12,316,405 1,312,746 13,629,151 Goodwill and other intangible assets 76,734 68,538 746 146,018 — 146,018 Deposits 10,190,613 8,301,004 2,090,582 20,582,199 12,587 20,594,786 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, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common and Preferred Stock* On December 17, 2018, the Company distributed a 5% stock dividend on its $5 par common stock for the 25th 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 10 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) 2018 2017 2016 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 433,542 $ 319,383 $ 275,391 Less preferred stock dividends 9,000 9,000 9,000 Net income available to common shareholders 424,542 310,383 266,391 Less income allocated to nonvested restricted stock 4,558 3,848 3,698 Net income allocated to common stock $ 419,984 $ 306,535 $ 262,693 Weighted average common shares outstanding 110,812 110,833 110,505 Basic income per common share $ 3.79 $ 2.77 $ 2.38 Diluted income per common share: Net income available to common shareholders $ 424,542 $ 310,383 $ 266,391 Less income allocated to nonvested restricted stock 4,547 3,838 3,692 Net income allocated to common stock $ 419,995 $ 306,545 $ 262,699 Weighted average common shares outstanding 110,812 110,833 110,505 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 343 391 295 Weighted average diluted common shares outstanding 111,155 111,224 110,800 Diluted income per common share $ 3.78 $ 2.76 $ 2.37 Unexercised stock appreciation rights of 223 thousand , 159 thousand and 88 thousand were excluded from the computation of diluted income per share for the years ended December 31, 2018 , 2017 and 2016 , respectively, because their inclusion would have been anti-dilutive. 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 October 2015 approved future purchases of 5,000,000 shares of the Company's common stock. At December 31, 2018 , 2,249,563 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) 2018 2017 2016 Shares outstanding at January 1 106,615 101,461 97,226 Issuance of stock: Awards and sales under employee and director plans 416 403 397 5% stock dividend 5,305 5,078 4,831 Other purchases of treasury stock (1,194 ) (315 ) (959 ) Other (13 ) (12 ) (34 ) Shares outstanding at December 31 111,129 106,615 101,461 * 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 2018 .

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [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, 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 % December 31, 2017 Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,747,863 14.35 % $ 1,531,996 8.00 % N.A. N.A. Commerce Bank 2,428,789 12.76 1,522,361 8.00 $ 1,902,951 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,567,264 13.41 % $ 1,148,997 6.00 % N.A. N.A. Commerce Bank 2,268,131 11.92 1,141,771 6.00 $ 1,522,361 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,422,480 12.65 % $ 861,748 4.50 % N.A. N.A. Commerce Bank 2,268,131 11.92 856,328 4.50 $ 1,236,918 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,567,264 10.39 % $ 988,653 4.00 % N.A. N.A. Commerce Bank 2,268,131 9.20 986,240 4.00 $ 1,232,800 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, 2018 and 2017 , 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, 2018
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, 2018 , approximately 62% 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 Company has concluded that the new guidance did not require any significant change to its 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 years ended December 31, 2017 and 2016 . For the year ended December 31, 2017 For the Year Ended December 31, 2016 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 180,441 $ (25,341 ) $ 155,100 $ 181,879 $ (27,836 ) $ 154,043 Total non-interest income 486,604 (25,341 ) 461,263 474,392 (27,836 ) 446,556 Non-interest expense: Data processing and software $ 92,246 $ (11,248 ) $ 80,998 $ 92,722 $ (13,133 ) $ 79,589 Other 77,459 (14,093 ) 63,366 74,202 (14,703 ) 59,499 Total non-interest expense 769,684 (25,341 ) 744,343 717,065 (27,836 ) 689,229 The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. For the Year Ended December 31 (In thousands) 2018 2017 2016 Bank card transaction fees $ 171,576 $ 155,100 $ 154,043 Trust fees 147,964 135,159 121,795 Deposit account charges and other fees 94,517 90,060 86,394 Consumer brokerage services 15,807 14,630 13,784 Other non-interest income 37,440 30,128 31,326 Total non-interest income from contracts with customers 467,304 425,077 407,342 Other non-interest income (a) 34,037 36,186 39,214 Total non-interest income $ 501,341 $ 461,263 $ 446,556 (a) 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, 2018 and 2017 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) December 31, 2018 December 31, 2017 December 31, 2016 Bank card transaction fees $ 13,035 $ 13,315 $ 14,686 Trust fees 2,721 2,802 2,681 Deposit account charges and other fees 6,107 5,597 5,735 Consumer brokerage services 559 380 309 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) 2018 2017 2016 Debit card: Fee income $ 41,522 $ 40,134 $ 39,430 Expense for network charges (1,784 ) (4,498 ) (5,989 ) Net debit card fees 39,738 35,636 33,441 Credit card: Fee income 26,799 25,275 24,650 Expense for network charges and rewards (13,834 ) (10,699 ) (9,816 ) Net credit card fees 12,965 14,576 14,834 Corporate card: Fee income 199,651 179,642 166,576 Expense for network charges and rewards (100,011 ) (94,823 ) (83,851 ) Net corporate card fees 99,640 84,819 82,725 Merchant: Fee income 30,241 31,863 37,407 Fees to cardholder banks (7,831 ) (8,228 ) (9,585 ) Expense for network charges (3,177 ) (3,566 ) (4,779 ) Net merchant fees 19,233 20,069 23,043 Total bank card transaction fees $ 171,576 $ 155,100 $ 154,043 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 show 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. For the Years Ended December 31 (In thousands) 2018 2017 2016 Private client $ 111,533 $ 100,358 $ 90,992 Institutional 29,241 27,477 24,565 Other 7,190 7,324 6,238 Total trust fees $ 147,964 $ 135,159 $ 121,795 This revenue is reported in the Wealth segment. 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 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) 2018 2017 2016 Corporate cash management fees $ 38,468 $ 36,044 $ 36,131 Overdraft and return item fees 31,468 30,576 29,350 Other service charges on deposit accounts 24,581 23,440 20,913 Total deposit account charges and other fees $ 94,517 $ 90,060 $ 86,394 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. For the Years Ended December 31 (In thousands) 2018 2017 2016 Commission income $ 8,956 $ 8,400 $ 8,170 Managed account services 6,851 6,230 5,614 Total consumer brokerage services $ 15,807 $ 14,630 $ 13,784 Nearly all of this revenue is reported in the Company's Wealth segment. 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 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, 2018
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 equity securities, available for sale debt securities, trading 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 loans held for sale, 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, 2018 and 2017 . 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, 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 December 31, 2017 Assets: Residential mortgage loans held for sale $ 15,327 $ — $ 15,327 $ — Available for sale debt securities: U.S. government and federal agency obligations 917,147 917,147 — — Government-sponsored enterprise obligations 406,363 — 406,363 — State and municipal obligations 1,611,366 — 1,594,350 17,016 Agency mortgage-backed securities 3,040,913 — 3,040,913 — Non-agency mortgage-backed securities 905,793 — 905,793 — Asset-backed securities 1,492,800 — 1,492,800 — Other debt securities 351,060 — 351,060 — Trading debt securities 18,269 — 18,269 — Equity securities 48,838 19,864 28,974 — Private equity investments 55,752 — — 55,752 Derivatives * 8,349 — 7,723 626 Assets held in trust for deferred compensation plan 12,843 12,843 — — Total assets 8,884,820 949,854 7,861,572 73,394 Liabilities: Derivatives * 8,074 — 7,951 123 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — Total liabilities $ 20,917 $ 12,843 $ 7,951 $ 123 * The fair value of each class of derivative is shown in Note 18. . 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, 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 Year ended December 31, 2017: Balance at January 1, 2017 $ 16,682 $ 50,820 $ 258 $ 67,760 Total gains or losses (realized/unrealized): Included in earnings — (5,833 ) 266 (5,567 ) Included in other comprehensive income 882 — — 882 Investment securities called (600 ) — — (600 ) Discount accretion 52 — — 52 Purchases of private equity securities — 13,352 — 13,352 Sale / pay down of private equity securities — (2,621 ) — (2,621 ) Capitalized interest/dividends — 34 — 34 Purchase of risk participation agreement — — 70 70 Sale of risk participation agreement — — (91 ) (91 ) Balance at December 31, 2017 $ 17,016 $ 55,752 $ 503 $ 73,271 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, 2017 $ — $ (5,658 ) $ 615 $ (5,043 ) 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, 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 Year ended December 31, 2017: Total gains or losses included in earnings $ 231 $ 35 $ (5,833 ) $ (5,567 ) Change in unrealized gains or losses relating to assets still held at December 31, 2017 $ 580 $ 35 $ (5,658 ) $ (5,043 ) 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 $14.2 million at December 31, 2018 , while private equity investments, included in other securities, totaled $85.7 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 4 - 5 years Estimated market rate 4.3% - 4.8% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 53.7% - 98.0% 78.6% Embedded servicing value .7% - 2.3% 1.3% 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 (which is usually a partial interest in the investee company) 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 2018 and 2017 , and still held as of December 31, 2018 and 2017 , 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, 2018 and 2017 . 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, 2018 Collateral dependent impaired loans $ 294 $ — $ — $ 294 $ (269 ) Mortgage servicing rights 6,478 — — 6,478 9 Long-lived assets 914 — — 914 (552 ) Balance at December 31, 2017 Collateral dependent impaired loans $ 1,236 $ — $ — $ 1,236 $ (617 ) Mortgage servicing rights 4,653 — — 4,653 13 Foreclosed assets — — — — (9 ) Long-lived assets 3,378 — — 3,378 (724 ) 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, 2018 and 2017 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. Foreclosed assets Foreclosed assets consist of loan collateral which has been repossessed through foreclosure. This collateral is comprised of commercial and residential real estate and other non-real estate property, including auto, marine and recreational vehicles. Foreclosed assets are initially recorded as held for sale at the lower of the loan balance or fair value of the collateral less estimated selling costs. Subsequent to foreclosure, valuations are updated periodically, and the assets may be marked down further, reflecting a new cost basis. Fair value measurements may be based upon appraisals, third-party price opinions, or internally developed pricing methods. These measurements are classified as Level 3. Long-lived assets When investments in branch facilities and various office buildings are determined to be impaired, their carrying values are written down to estimated fair value, or estimated fair value less cost to sell if the property is held for sale. Fair value is estimated in a process which considers current local commercial real estate market conditions and the judgment of the sales agent and often involves obtaining third party appraisals from certified real estate appraisers. The carrying amounts of these real estate holdings are regularly monitored by real estate professionals employed by the Company. These fair value measurements are classified as Level 3. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable.

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	12 Months Ended
	Dec. 31, 2018
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. As mentioned in Note 3, the Company prospectively adopted ASU 2016-01 on January 1, 2018. In accordance with its requirements, the fair value of loans as of December 31, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion. The estimated fair values of the Company’s financial instruments and the classification of their fair value measurements within the valuation hierarchy are as follows at December 31, 2018 and 2017 : 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 — — 8,702 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 $ 13,328 $ 3,617,001 $ 22,322,004 Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,958,554 $ — $ — $ 4,971,401 $ 4,971,401 Real estate - construction and land 968,820 — — 979,389 979,389 Real estate - business 2,697,452 — — 2,702,598 2,702,598 Real estate - personal 2,062,787 — — 2,060,443 2,060,443 Consumer 2,104,487 — — 2,074,129 2,074,129 Revolving home equity 400,587 — — 400,333 400,333 Consumer credit card 783,864 — — 798,093 798,093 Overdrafts 7,123 — — 7,123 7,123 Total loans 13,983,674 — — 13,993,509 13,993,509 Loans held for sale 21,398 — 21,398 — 21,398 Investment securities 8,893,307 937,011 7,838,522 117,774 8,893,307 Federal funds sold 42,775 42,775 — — 42,775 Securities purchased under agreements to resell 700,000 — — 695,194 695,194 Interest earning deposits with banks 30,631 30,631 — — 30,631 Cash and due from banks 438,439 438,439 — — 438,439 Derivative instruments 8,349 — 7,723 626 8,349 Assets held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 24,131,416 $ 1,461,699 $ 7,867,643 $ 14,807,103 $ 24,136,445 Financial Liabilities Non-interest bearing deposits $ 7,158,962 $ 7,158,962 $ — $ — $ 7,158,962 Savings, interest checking and money market deposits 11,499,620 11,499,620 — — 11,499,620 Certificates of deposit 1,766,864 — — 1,768,780 1,768,780 Federal funds purchased 202,370 202,370 — — 202,370 Securities sold under agreements to repurchase 1,304,768 — — 1,305,375 1,305,375 Other borrowings 1,758 — — 1,758 1,758 Derivative instruments 8,074 — 7,951 123 8,074 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 21,955,259 $ 18,873,795 $ 7,951 $ 3,076,036 $ 21,957,782

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2018
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. At December 31, 2018 , 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) 2018 2017 Interest rate swaps $ 2,006,280 $ 1,741,412 Interest rate floors 1,000,000 — Interest rate caps 62,163 31,776 Credit risk participation agreements 143,460 133,488 Foreign exchange contracts 6,206 11,826 Mortgage loan commitments 14,544 17,110 Mortgage loan forward sale contracts 5,768 2,566 Forward TBA contracts 16,500 25,000 Total notional amount $ 3,254,921 $ 1,963,178 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 arrangements 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 can require instant settlement of the contracts. The Company maintains debt ratings and capital well above these minimum requirements. During the year ended December 31, 2018, the Company entered into interest rate floors, with a combined notional value of $1.0 billion , to hedge the potential risk of declining interest rates on certain floating rate commercial loans. The premiums paid for these floors totaled $20.7 million . As of December 31, 2018 , the maximum length of time over which the Company is hedging its exposure to the variability in future cash flows is approximately 6 years, and the floors are forward starting, beginning in 2020. 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, 2018 , net deferred gains on the interest rate floors totaled $9.1 million (pre-tax) and were recorded in AOCI in the consolidated balance sheet. As of December 31, 2018 , it is expected that $2.8 million (pre-tax) of interest rate floor premium amortization will be reclassified from AOCI into earnings over the next twelve months. The Company’s foreign exchange activity involves the purchase and sale of forward foreign exchange contracts, which are commitments to purchase or deliver a specified amount of foreign currency at a specific future date. This activity enables customers involved in international business to hedge their exposure to foreign currency exchange rate fluctuations. The Company minimizes its related exposure arising from these customer transactions with offsetting contracts for the same currency and time frame with approved, reputable counterparties. Risk arises from changes in the currency exchange rate and from the potential for counterparty nonperformance. These risks are controlled by adherence to a foreign exchange trading policy which contains control limits on currency amounts, open positions, maturities and losses, and procedures for approvals, record-keeping, monitoring and reporting. Hedge accounting has not been applied to these foreign exchange activities. Credit risk participation agreements arise when the Company contracts, as a guarantor or beneficiary, with other financial institutions to share credit risk associated with certain interest rate swaps. These agreements provide for reimbursement of losses resulting from a third party default on the underlying swap. The Company’s risks and responsibilities as guarantor are further discussed in Note 20 on Commitments, Contingencies and Guarantees. 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 are shown in the table below. Information about the valuation methods used to measure fair value is provided in Note 16 on Fair Value Measurements. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. As mentioned in Note 16, effective January 2017, 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, 2018 in the table below, 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 . At December 31, 2017 , the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million . Asset Derivatives Liability Derivatives December 31 December 31 2018 2017 2018 2017 (In thousands ) Fair Value Fair Value Derivatives designated as hedging instruments: Interest rate floors $ 29,031 $ — $ — $ — Total derivatives designated as hedging instruments $ 29,031 $ — $ — $ — Derivatives not designated as hedging instruments: Interest rate swaps $ 11,537 $ 7,674 $ (13,110 ) $ (7,857 ) Interest rate caps 24 16 (24 ) (16 ) Credit risk participation agreements 47 46 (93 ) (123 ) Foreign exchange contracts 20 21 (8 ) (40 ) Mortgage loan commitments 536 580 — — Mortgage loan forward sale contracts 15 8 (8 ) (7 ) Forward TBA contracts — 4 (178 ) (31 ) Total derivatives not designated as hedging instruments $ 12,179 $ 8,349 $ (13,421 ) $ (8,074 ) Total $ 41,210 $ 8,349 $ (13,421 ) $ (8,074 ) 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 For the Year Ended December 31 For the Year Ended December 31 (In thousands) 2018 2018 Derivatives in cash flow hedging relationships: Interest rate floors* (a) $ 8,381 Interest and fees on loans $ (760 ) Total $ 8,381 $ (760 ) * No hedging relationship existed during 2017 and 2016. (a) Amounts shown herein were excluded from the assessment of effectiveness, as they represent the time value component of derivative gains (losses). 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) 2018 2017 2016 Derivative instruments: Interest rate swaps Other non-interest income $ 3,914 $ 1,978 $ 5,927 Interest rate caps Other non-interest income 11 — — Credit risk participation agreements Other non-interest income 150 35 (44 ) Foreign exchange contracts: Other non-interest income 31 (80 ) 55 Mortgage loan commitments Loan fees and sales (45 ) 231 87 Mortgage loan forward sale contracts Loan fees and sales 5 64 (63 ) Forward TBA contracts Loan fees and sales 414 (648 ) 79 Total $ 4,480 $ 1,580 $ 6,041 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, usually in the form of marketable securities, is exchanged between the Company and dealer bank counterparties and is generally subject to thresholds and transfer minimums. By contract, it 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 to its clearing agency. 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, 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 December 31, 2017 Assets: Derivatives subject to master netting agreements $ 7,726 $ — $ 7,726 $ (233 ) $ (824 ) $ 6,669 Derivatives not subject to master netting agreements 623 — 623 Total derivatives 8,349 — 8,349 Liabilities: Derivatives subject to master netting agreements 7,935 — 7,935 (233 ) (1,570 ) 6,132 Derivatives not subject to master netting agreements 139 — 139 Total derivatives 8,074 — 8,074

Resale and Repurchase Agreement

Resale and Repurchase Agreements Resale and Repurchase Agreements	12 Months Ended
	Dec. 31, 2018
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 several 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 balance sheet, having met the accounting requirements for this treatment. The collateral swaps totaled $450.0 million at December 31, 2018 and $650.0 million at December 31, 2017 . At December 31, 2018 , the Company had posted collateral of $463.3 million in marketable securities, consisting of agency mortgage-backed bonds and treasuries, and had accepted $453.7 million in agency mortgage-backed and corporate 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, 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 ) — December 31, 2017 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,954,768 (650,000 ) 1,304,768 — (1,304,768 ) — The table below shows the remaining contractual maturities of repurchase agreements outstanding at December 31, 2018 and 2017 , 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, 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 December 31, 2017 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 271,820 $ 1,731 $ 450,000 $ 723,551 Government-sponsored enterprise obligations 149,111 — — 149,111 Agency mortgage-backed securities 737,975 9,750 200,000 947,725 Asset-backed securities 89,601 30,000 — 119,601 Other debt securities 14,780 — — 14,780 Total repurchase agreements, gross amount recognized $ 1,263,287 $ 41,481 $ 650,000 $ 1,954,768

Commitments, Contingencies And

Commitments, Contingencies And Guarantees	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies And Guarantees	Commitments, Contingencies and Guarantees The Company leases certain premises and equipment, all of which were classified as operating leases. The rent expense under such arrangements amounted to $7.7 million , $7.3 million and $7.1 million in 2018 , 2017 and 2016 , respectively. A summary of minimum lease commitments follows: (In thousands) Type of Property Year Ended December 31 Real Property Equipment Total 2019 $ 5,659 $ 104 $ 5,763 2020 4,766 51 4,817 2021 4,027 28 4,055 2022 3,598 — 3,598 2023 3,273 — 3,273 After 15,161 — 15,161 Total minimum lease payments $ 36,667 All leases expire prior to 2054. It is expected that in the normal course of business, leases that expire will be renewed or replaced by leases on other properties; thus, the future minimum lease commitments are not expected to be less than the amounts shown for 2019 . 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) 2018 2017 Commitments to extend credit: Credit card $ 5,328,502 $ 5,102,556 Other 5,840,967 5,737,181 Standby letters of credit, net of participations 353,905 387,811 Commercial letters of credit 13,774 4,498 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, 2018 , the Company had recorded a liability in the amount of $2.7 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 $353.9 million at December 31, 2018 . 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 2018 , purchases and sales of tax credits amounted to $80.9 million and $71.6 million , respectively. At December 31, 2018 , the Company had outstanding purchase commitments totaling $180.5 million that it expects to fund in 2019 . 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, 2018 , believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term, with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 2 to 11 years. At December 31, 2018 , the fair value of the Company's guarantee liability RPAs was $93 thousand , and the notional amount of the underlying swaps was $87.4 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, 2018 , 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, 2018
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, 2018 , Tower owned 201,901 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) 2018 2017 2016 Leasing agent fees $ 133 $ 32 $ 101 Operation of parking garages 95 82 184 Building management fees 1,935 1,954 1,832 Property construction management fees 136 146 147 Dividends paid on Company stock held by Tower 181 232 221 Total $ 2,480 $ 2,446 $ 2,485 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 $9.1 million at December 31, 2018 . There were no borrowings under this line during 2018 , and there was no balance outstanding at December 31, 2018 . The maximum borrowings during 2017 were $5.2 million , and there were no borrowings during 2016 . There was no balance outstanding at December 31, 2017 or 2016 . Interest paid on these 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 2018 , 2017 or 2016 , 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 2018 , 2017 and 2016 . Tower leases office space in the Kansas City bank headquarters building owned by the Company. Rent paid to the Company totaled $74 thousand in 2018 , $74 thousand in 2017 , and $72 thousand in 2016 , at $16.69 , $15.75 and $15.67 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 20 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 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, for personal tax planning. 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. During 2016 , the Company sold state tax credits to its Executive Chairman, his father (a former Chief Executive Officer), its former Vice Chairman, and its Chief Executive Officer in the amount of $549 thousand , $191 thousand , $244 thousand , and $72 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, 2018
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) 2018 2017 Assets Investment in consolidated subsidiaries: Bank $ 2,587,489 $ 2,409,098 Non-banks 67,538 52,479 Cash 207,462 151,607 Investment securities: Available for sale debt 2,576 4,595 Equity 3,191 49,345 Note receivable due from bank subsidiary 50,000 50,000 Advances to subsidiaries, net of borrowings 19,867 14,571 Income tax benefits 8,590 8,279 Other assets 23,734 19,951 Total assets $ 2,970,447 $ 2,759,925 Liabilities and stockholders’ equity Pension obligation $ 12,645 $ 12,407 Other liabilities 26,504 30,958 Total liabilities 39,149 43,365 Stockholders’ equity 2,931,298 2,716,560 Total liabilities and stockholders’ equity $ 2,970,447 $ 2,759,925 Condensed Statements of Income For the Years Ended December 31 (In thousands) 2018 2017 2016 Income Dividends received from consolidated bank subsidiary $ 200,000 $ 160,002 $ 160,002 Earnings of consolidated subsidiaries, net of dividends 233,785 147,678 118,704 Interest and dividends on investment securities 10,698 2,099 2,364 Management fees charged to subsidiaries 37,688 30,431 30,965 Investment securities gains (losses) (4,581 ) 41,717 1,880 Net interest income on advances and note to subsidiaries 1,299 514 21 Other 2,390 3,346 2,720 Total income 481,279 385,787 316,656 Expense Salaries and employee benefits 33,588 33,714 29,116 Professional fees 2,383 2,036 1,951 Data processing fees paid to affiliates 3,341 3,512 3,226 Community service 152 32,093 1,620 Other 10,729 10,671 9,849 Total expense 50,193 82,026 45,762 Income tax benefit (2,456 ) (15,622 ) (4,497 ) Net income $ 433,542 $ 319,383 $ 275,391 Condensed Statements of Cash Flows For the Years Ended December 31 (In thousands ) 2018 2017 2016 Operating Activities Net income $ 433,542 $ 319,383 $ 275,391 Adjustments to reconcile net income to net cash provided by operating activities: Earnings of consolidated subsidiaries, net of dividends (233,785 ) (147,678 ) (118,704 ) Other adjustments, net 2,505 (11,268 ) 9,541 Net cash provided by operating activities 202,262 160,437 166,228 Investing Activities (Increase) decrease in securities purchased under agreements to resell — 155,775 (51,335 ) Decrease in investment in subsidiaries, net — 11 4 Proceeds from sales of investment securities 41,638 11,006 2,949 Proceeds from maturities/pay downs of investment securities 1,988 2,295 4,105 Purchases of investment securities (125 ) — — Note receivable due from bank subsidiary — (50,000 ) — (Increase) decrease in advances to subsidiaries, net (5,296 ) (9,518 ) 13,507 Net purchases of building improvements and equipment (133 ) (52 ) (3 ) Net cash provided by (used in) investing activities 38,072 109,517 (30,773 ) Financing Activities Purchases of treasury stock (75,231 ) (17,771 ) (39,381 ) Issuance of stock under equity compensation plans (10 ) (8 ) (6 ) Cash dividends paid on common stock (100,238 ) (91,619 ) (87,070 ) Cash dividends paid on preferred stock (9,000 ) (9,000 ) (9,000 ) Net cash used in financing activities (184,479 ) (118,398 ) (135,457 ) Increase (decrease) in cash 55,855 151,556 (2 ) Cash at beginning of year 151,607 51 53 Cash at end of year $ 207,462 $ 151,607 $ 51 Income tax receipts, net $ (1,965 ) $ (8,991 ) $ (8,958 ) 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 line of credit is secured by investment securities. The Parent has not borrowed under this line during the past three years. At December 31, 2018 , the fair value of the investment securities held by the Parent consisted of investments of $2.5 million in common and preferred stock with readily determinable fair values, $720 thousand in equity securities that do not have readily determinable fair values, and $2.6 million in non-agency mortgage-backed securities. The decline in balances from the prior year was due to a third party merger transaction in June 2018, in which the majority of these securities were redeemed for cash of $39.9 million .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Nature Of Operations	Nature of Operations Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 320 branch and ATM locations throughout Missouri, Illinois, Kansas, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, credit related insurance and private equity investment activities. 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 $8.2 million and $12.5 million at December 31, 2018 and 2017 , 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, 2018 totaled $228.3 million . Other interest earning cash balances held at the Federal Reserve Bank totaled $689.9 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 borrowers’ 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.
Operating, Direct Financing And Sales Type Leases	Operating, 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. The net investment in operating leases is included in other assets on the Company’s consolidated balance sheets. It is carried at cost, less the amount depreciated to date. Depreciation is recognized on a straight-line basis over the lease term to the estimated residual value. Operating lease revenue consists of the contractual lease payments and is recognized over the lease term in other non-interest income. Estimated residual values are established at lease inception utilizing contract terms, past customer experience, and general market data and are reviewed and adjusted, if necessary, on an annual basis.
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 which 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 mortgage and asset-backed securities, prepayment experience is evaluated quarterly to determine the appropriate estimate of the future rate of prepayment. When a change in a bond's estimated remaining life is necessary, a corresponding adjustment is 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 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 19, Resale and Repurchase Agreements.
Land, Buildings And Equipment	Land, Buildings 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.
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 which 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 8, 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 in 2018 the Company 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 16, Fair Value Measurements and Note 18, Derivative Instruments.
Pension Plan	Pension Plan The Company’s pension plan is described in Note 9, 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 10, 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. In periods prior to 2017, expense was reduced for estimated forfeitures over the vesting period and adjusted for actual forfeitures as they occurred. Effective January 1, 2017, the Company elected to recognize forfeitures as a reduction to expense only when they have occurred, as allowed under the provisions of ASU 2016-09. The effect of this change, which was recognized as a cumulative-effect adjustment on January 1, 2017, increased equity and increased deferred tax assets by approximately $1.3 million .
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 2018 .

Loans And Allowance For Loan _2

Loans And Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017 are as follows: (In thousands) 2018 2017 Commercial: Business $ 5,106,427 $ 4,958,554 Real estate — construction and land 869,659 968,820 Real estate — business 2,875,788 2,697,452 Personal Banking: Real estate — personal 2,127,083 2,062,787 Consumer 1,955,572 2,104,487 Revolving home equity 376,399 400,587 Consumer credit card 814,134 783,864 Overdrafts 15,236 7,123 Total loans $ 14,140,298 $ 13,983,674
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, 2018 $ 47,225 Additions 127,253 Amounts collected (128,540 ) Amounts written off — Balance, December 31, 2018 $ 45,938
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, 2015 $ 82,086 $ 69,446 $ 151,532 Provision for loan losses 4,898 31,420 36,318 Deductions: Loans charged off 3,258 47,720 50,978 Less recoveries 7,635 11,425 19,060 Net loans charged off (recoveries) (4,377 ) 36,295 31,918 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 (recoveries) 1,089 41,205 42,294 Balance at December 31, 2018 $ 92,869 $ 67,063 $ 159,932
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, 2018 and 2017 , 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, 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 December 31, 2017 Commercial $ 3,067 $ 92,613 $ 90,637 $ 8,532,213 Personal Banking 1,176 22,182 64,652 5,336,666 Total $ 4,243 $ 114,795 $ 155,289 $ 13,868,879
Investment In Impaired Loans	(In thousands) 2018 2017 Non-accrual loans $ 12,536 $ 11,983 Restructured loans (accruing) 66,080 102,812 Total impaired loans $ 78,616 $ 114,795
Additional Information About Impaired Loans Held	The following table provides additional information about impaired loans held by the Company at December 31, 2018 and 2017 , 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, 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 December 31, 2017 With no related allowance recorded: Business $ 5,356 $ 9,000 $ — Real estate – business 1,299 1,303 — Consumer 779 817 — $ 7,434 $ 11,120 $ — With an allowance recorded: Business $ 72,589 $ 73,168 $ 2,455 Real estate – construction and land 837 841 27 Real estate – business 12,532 13,071 585 Real estate – personal 9,126 11,914 532 Consumer 5,388 5,426 67 Revolving home equity 204 204 11 Consumer credit card 6,685 6,685 566 $ 107,361 $ 111,309 $ 4,243 Total $ 114,795 $ 122,429 $ 4,243
Total Average Impaired Loans	Total average impaired loans during 2018 and 2017 are shown in the table below. 2018 2017 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Average impaired loans: Non-accrual loans $ 7,619 $ 2,122 $ 9,741 $ 9,658 $ 3,989 $ 13,647 Restructured loans (accruing) 73,261 16,526 89,787 49,070 17,539 66,609 Total $ 80,880 $ 18,648 $ 99,528 $ 58,728 $ 21,528 $ 80,256
Interest Income Recognized On Impaired Loans	The table below shows interest income recognized during the years ended December 31, 2018 , 2017 and 2016 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously. Years Ended December 31 (In thousands) 2018 2017 2016 Interest income recognized on impaired loans: Business $ 2,219 $ 3,135 $ 1,064 Real estate – construction and land 25 41 2 Real estate – business 558 514 171 Real estate – personal 139 402 152 Consumer 305 307 339 Revolving home equity 3 10 31 Consumer credit card 746 673 722 Total $ 3,995 $ 5,082 $ 2,481
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, 2018 and 2017 . (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, 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 December 31, 2017 Commercial: Business $ 4,949,148 $ 3,085 $ 374 $ 5,947 $ 4,958,554 Real estate – construction and land 967,321 1,473 21 5 968,820 Real estate – business 2,694,234 482 — 2,736 2,697,452 Personal Banking: Real estate – personal 2,050,787 6,218 3,321 2,461 2,062,787 Consumer 2,067,025 32,674 3,954 834 2,104,487 Revolving home equity 397,349 1,962 1,276 — 400,587 Consumer credit card 764,568 10,115 9,181 — 783,864 Overdrafts 6,840 283 — — 7,123 Total $ 13,897,272 $ 56,292 $ 18,127 $ 11,983 $ 13,983,674
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 attached 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, as discussed in Note 1. Commercial Loans (In thousands) Business Real Estate -Construction Real Estate - Business Total 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 December 31, 2017 Pass $ 4,740,013 $ 955,499 $ 2,593,005 $ 8,288,517 Special mention 59,177 10,614 50,577 120,368 Substandard 153,417 2,702 51,134 207,253 Non-accrual 5,947 5 2,736 8,688 Total $ 4,958,554 $ 968,820 $ 2,697,452 $ 8,624,826
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. 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 $201.7 million at December 31, 2018 and $219.2 million at December 31, 2017 . The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $170.3 million at December 31, 2018 and $145.0 million at December 31, 2017 . 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, 2018 and 2017 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card 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 % December 31, 2017 FICO score: Under 600 1.3 % 3.3 % 1.1 % 4.7 % 600 – 659 2.1 5.5 1.7 14.4 660 – 719 10.5 17.3 9.5 34.4 720 – 779 25.6 26.8 21.4 26.0 780 and over 60.5 47.1 66.3 20.5 Total 100.0 % 100.0 % 100.0 % 100.0 %
Additional Information about Troubled Debt Restructurings [Table Text Block]	December 31 (In thousands) 2018 2017 Accruing loans: Commercial $ 50,904 $ 88,588 Assistance programs 7,410 6,941 Consumer bankruptcy 4,103 3,916 Other consumer 3,663 3,367 Non-accrual loans 9,759 7,796 Total troubled debt restructurings $ 75,839 $ 110,608
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, 2018 , in addition to the period end 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, 2018 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 48,777 $ 25 Real estate – construction and land 412 — Real estate – business 10,355 — Personal Banking: Real estate – personal 3,636 158 Consumer 5,510 50 Revolving home equity 40 — Consumer credit card 7,109 670 Total troubled debt restructurings $ 75,839 $ 903

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities, At Fair Value	Investment securities, at fair value, consisted of the following at December 31, 2018 and 2017 : 2018 2017 Available for sale debt securities $ 8,538,041 $ 8,725,442 Trading debt securities 27,059 18,269 Equity securities: Readily determinable fair value 2,585 48,838 No readily determinable fair value 1,824 1,753 Other: Federal Reserve Bank stock 33,498 33,253 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 85,659 55,752 Total investment securities $ 8,698,666 $ 8,893,307
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 $ 23,577 $ 23,518 (.04 )*% After 1 but within 5 years 434,973 435,690 1.90 * After 5 but within 10 years 386,708 381,419 1.61 * After 10 years 69,228 67,025 .64 * Total U.S. government and federal agency obligations 914,486 907,652 1.63 * Government-sponsored enterprise obligations: Within 1 year 24,991 24,743 1.53 After 1 but within 5 years 96,601 95,619 2.03 After 5 but within 10 years 34,985 34,460 2.71 After 10 years 42,893 40,956 3.10 Total government-sponsored enterprise obligations 199,470 195,778 2.32 State and municipal obligations: Within 1 year 98,429 98,675 2.45 After 1 but within 5 years 656,762 659,525 2.37 After 5 but within 10 years 493,994 496,997 2.58 After 10 years 73,600 72,842 3.22 Total state and municipal obligations 1,322,785 1,328,039 2.50 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,253,433 3,214,985 2.85 Non-agency mortgage-backed securities 1,053,854 1,047,716 2.85 Asset-backed securities 1,518,976 1,511,614 2.62 Total mortgage and asset-backed securities 5,826,263 5,774,315 2.79 Other debt securities: Within 1 year 16,500 16,418 After 1 but within 5 years 249,870 245,319 After 5 but within 10 years 73,225 70,520 Total other debt securities 339,595 332,257 Total available for sale debt securities $ 8,602,599 $ 8,538,041
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 accumulated other comprehensive income, by security type. (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value 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 December 31, 2017 U.S. government and federal agency obligations $ 917,494 $ 4,096 $ (4,443 ) $ 917,147 Government-sponsored enterprise obligations 408,266 26 (1,929 ) 406,363 State and municipal obligations 1,592,707 21,413 (2,754 ) 1,611,366 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,046,701 17,956 (23,744 ) 3,040,913 Non-agency mortgage-backed securities 903,920 6,710 (4,837 ) 905,793 Asset-backed securities 1,495,380 2,657 (5,237 ) 1,492,800 Total mortgage and asset-backed securities 5,446,001 27,323 (33,818 ) 5,439,506 Other debt securities 350,988 1,250 (1,178 ) 351,060 Total $ 8,715,456 $ 54,108 $ (44,122 ) $ 8,725,442
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, 2018 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 8% - 52% Credit support 0% - 20% Loss severity 13% - 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) 2018 2017 2016 Cumulative OTTI credit losses at January 1 $ 14,199 $ 14,080 $ 14,129 Credit losses on debt securities for which impairment was not previously recognized 58 111 — Credit losses on debt securities for which impairment was previously recognized 10 274 270 Increase in expected cash flows that are recognized over remaining life of security (175 ) (266 ) (319 ) Cumulative OTTI credit losses at December 31 $ 14,092 $ 14,199 $ 14,080
Securities With Unrealized Losses And Length Of Impairment Period	Debt securities with unrealized losses recorded in accumulated other comprehensive income 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, 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 December 31, 2017 U.S. government and federal agency obligations $ 618,617 $ 4,443 $ — $ — $ 618,617 $ 4,443 Government-sponsored enterprise obligations 286,393 1,712 49,766 217 336,159 1,929 State and municipal obligations 282,843 1,752 49,339 1,002 332,182 2,754 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,320,689 9,433 619,300 14,311 1,939,989 23,744 Non-agency mortgage-backed securities 577,017 2,966 153,813 1,871 730,830 4,837 Asset-backed securities 786,048 3,168 264,295 2,069 1,050,343 5,237 Total mortgage and asset-backed securities 2,683,754 15,567 1,037,408 18,251 3,721,162 33,818 Other debt securities 144,090 727 20,202 451 164,292 1,178 Total $ 4,015,697 $ 24,201 $ 1,156,715 $ 19,921 $ 5,172,412 $ 44,122
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) 2018 2017 2016 Proceeds from sales of securities: Available for sale debt securities $ 667,227 $ 779,793 $ 2,047 Equity securities 41,637 10,953 3,026 Other — 1,634 19,307 Total proceeds $ 708,864 $ 792,380 $ 24,380 Investment securities gains (losses), net: Available for sale debt securities: Losses realized on called bonds $ — $ (254 ) $ — Gains realized on sales 448 592 109 Losses realized on sales (10,101 ) (10,287 ) — Other-than-temporary impairment recognized on debt securities (68 ) (385 ) (270 ) Equity securities: Gains realized on donations of securities — 31,074 — Gains realized on sales 1,759 10,653 1,911 Losses realized on sales (8,917 ) (10 ) (7 ) Fair value adjustments, net 2,542 — — Other: Gains realized on sales — 381 2,442 Losses realized on sales — (880 ) (499 ) Fair value adjustments, net 13,849 (5,833 ) (3,739 ) Total investment securities gains (losses), net $ (488 ) $ 25,051 $ (53 )

Land, Buildings And Equipment (

Land, Buildings And Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule Of Land, Buildings And Equipment	Land, buildings and equipment consist of the following at December 31, 2018 and 2017 : (In thousands) 2018 2017 Land $ 91,603 $ 94,992 Buildings and improvements 545,510 540,204 Equipment 226,666 216,876 Total 863,779 852,072 Less accumulated depreciation 530,660 516,962 Net land, buildings and equipment $ 333,119 $ 335,110

Goodwill And Other Intangible_2

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 December 31, 2017 ( 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 $ (28,954 ) $ — $ 2,316 $ 31,270 $ (28,305 ) $ — $ 2,965 Mortgage servicing rights 10,339 (3,861 ) — 6,478 7,906 (3,244 ) (9 ) 4,653 Total $ 41,609 $ (32,815 ) $ — $ 8,794 $ 39,176 $ (31,549 ) $ (9 ) $ 7,618
Schedule Of Goodwill Allocated By Operating Segments	The carrying amount of goodwill and its allocation among segments at December 31, 2018 and 2017 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2018 , 2017 or 2016 . Further, the annual assessment of qualitative factors on January 1, 2019 revealed no likelihood of impairment as of that date. (In thousands) December 31, 2018 December 31, 2017 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, 2018 and 2017 are shown in the following table. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance at December 31, 2016 $ 138,921 $ 3,841 $ 2,868 Originations — — 2,234 Amortization — (876 ) (462 ) Impairment reversal — — 13 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
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, 2018 . 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) 2019 $ 1,273 2020 1,097 2021 957 2022 842 2023 732

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Scheduled Maturities Of Total Time Open And Certificates Of Deposit	At December 31, 2018 , the scheduled maturities of certificates of deposit were as follows: (In thousands) Due in 2019 $ 1,286,425 Due in 2020 281,717 Due in 2021 54,939 Due in 2022 18,301 Due in 2023 15,933 Thereafter 807 Total $ 1,658,122
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, 2018 . (In thousands) Certificates of Deposit under $100,000 Certificates of Deposit over $100,000 Total Due in 3 months or less $ 116,068 $ 446,300 $ 562,368 Due in over 3 through 6 months 117,046 245,994 363,040 Due in over 6 through 12 months 176,591 184,426 361,017 Due in over 12 months 176,386 195,311 371,697 Total $ 586,091 $ 1,072,031 $ 1,658,122

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
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: 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 2016 .4 .3 1,266,093 1,723,905 1,723,905

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 , 2017 and 2016 were as follows: (In thousands) Current Deferred Total 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 Year ended December 31, 2016: U.S. federal $ 116,753 $ (2,036 ) $ 114,717 State and local 9,457 (23 ) 9,434 Total $ 126,210 $ (2,059 ) $ 124,151
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, 2018 , 2017 and 2016 were as follows: (In thousands) 2018 2017 2016 Unrealized gain (loss) on available for sale debt securities $ (18,634 ) $ 2,104 $ (13,952 ) Change in fair value on cash flow hedges 2,286 — — Accumulated pension (benefit) loss 222 (184 ) 778 Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes — — (3,390 ) Income tax (benefit) expense allocated to stockholders’ equity $ (16,126 ) $ 1,920 $ (16,564 )
Components Of Deferred Tax Assets And Liabilities	Significant components of the Company’s deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows: (In thousands) 2018 2017 Deferred tax assets: Loans, principally due to allowance for loan losses $ 39,169 $ 40,341 Unrealized loss on available for sale debt securities 16,140 — Equity-based compensation 7,609 8,201 Deferred compensation 5,911 5,647 Unearned fee income 4,125 3,701 Accrued expenses 2,152 5,245 Private equity investments 2,008 5,473 Other 528 4,430 Total deferred tax assets 77,642 73,038 Deferred tax liabilities: Equipment lease financing 55,738 45,825 Unrealized gain on available for sale debt securities — 13,603 Land, buildings and equipment 14,207 8,592 Undistributed earnings of subsidiaries — 7,094 Intangibles 5,973 5,732 Other 5,309 6,569 Total deferred tax liabilities 81,227 87,415 Net deferred tax liabilities $ (3,585 ) $ (14,377 )
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 2018 and 35% in 2017 and 2016. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense. (In thousands) 2018 2017 2016 Computed “expected” tax expense $ 113,293 $ 150,461 $ 139,840 Increase (decrease) in income taxes resulting from: Tax-exempt interest, net of cost to carry (11,502 ) (20,295 ) (20,033 ) Contribution of appreciated securities — (10,864 ) — State and local income taxes, net of federal tax benefit 9,748 5,955 6,132 Tax reform enactment — (6,753 ) — Share-based award payments (3,928 ) (6,613 ) — Other (1,662 ) (1,385 ) (1,788 ) Total income tax expense $ 105,949 $ 110,506 $ 124,151
Schedule Of Accrued Liability For Unrecognized Tax Benefit	The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2018 and 2017 was as follows: (In thousands) 2018 2017 Unrecognized tax benefits at beginning of year $ 1,208 $ 1,228 Gross increases – tax positions in prior period 31 5 Gross increases – current-period tax positions 322 268 Lapse of statute of limitations (304 ) (293 ) Unrecognized tax benefits at end of year $ 1,257 $ 1,208 The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2015 through 2018 remain open to examination for U.S. federal income tax, and tax years 2014 through 2018 remain open to examination in major state taxing jurisdictions.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 2016 Payroll taxes $ 25,712 $ 24,402 $ 23,210 Medical plans 27,030 25,143 25,497 401(k) plan 14,986 14,244 13,562 Pension plans 651 704 987 Other 2,918 2,883 3,214 Total employee benefits $ 71,297 $ 67,376 $ 66,470
Components Of The Net Pension Cost	The following items are components of the net pension cost for the years ended December 31, 2018 , 2017 and 2016 . (In thousands) 2018 2017 2016 Service cost-benefits earned during the year $ 651 $ 621 $ 500 Interest cost on projected benefit obligation 3,756 3,826 3,944 Expected return on plan assets (5,255 ) (5,785 ) (5,751 ) Amortization of prior service cost (271 ) (271 ) (271 ) Amortization of unrecognized net loss 2,267 2,313 2,565 Net periodic pension cost $ 1,148 $ 704 $ 987
Summary Of Pension Plans Funded Status	The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2018 and 2017 . (In thousands ) 2018 2017 Change in projected benefit obligation Projected benefit obligation at prior valuation date $ 120,667 $ 116,695 Service cost 651 621 Interest cost 3,756 3,826 Benefits paid (6,622 ) (6,780 ) Actuarial (gain) loss (6,389 ) 6,305 Projected benefit obligation at valuation date 112,063 120,667 Change in plan assets Fair value of plan assets at prior valuation date 108,260 99,537 Actual return on plan assets (2,244 ) 9,564 Employer contributions 24 5,939 Benefits paid (6,622 ) (6,780 ) Fair value of plan assets at valuation date 99,418 108,260 Funded status and net amount recognized at valuation date $ (12,645 ) $ (12,407 )
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, 2018 and 2017 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis. (In thousands) 2018 2017 Prior service cost $ 1,535 $ 1,806 Accumulated loss (32,342 ) (33,499 ) Accumulated other comprehensive loss (30,807 ) (31,693 ) Cumulative employer contributions in excess of net periodic benefit cost 18,162 19,286 Net amount recognized as an accrued benefit liability on the December 31 balance sheet $ (12,645 ) $ (12,407 ) Net loss arising during period (1,110 ) (2,527 ) Amortization of net loss 2,267 2,313 Amortization of prior service cost (271 ) (271 ) Total recognized in other comprehensive income $ 886 $ (485 ) Total expense recognized in net periodic pension cost and other comprehensive income $ (262 ) $ (1,189 )
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. 2018 2017 2016 Determination of benefit obligation at year end: Effective discount rate for benefit obligations 4.14 % 3.57 % 4.05 % 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 3.57 % 3.95 % 4.16 % Effective rate for interest on benefit obligations 3.28 % 3.28 % 3.38 % Long-term rate of return on assets 5.00 % 6.00 % 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, 2018 and 2017 . Information about the valuation techniques and inputs used to measure fair value are provided in Note 16 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, 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 $ — December 31, 2017 Assets: U.S. government obligations $ 3,719 $ 3,719 $ — $ — Government-sponsored enterprise obligations (a) 1,282 — 1,282 — State and municipal obligations 8,527 — 8,527 — Agency mortgage-backed securities (b) 7,896 — 7,896 — Non-agency mortgage-backed securities 4,891 — 4,891 — Asset-backed securities 3,833 — 3,833 — Corporate bonds (c) 37,457 — 37,457 — Equity securities and mutual funds: (d) Mutual funds 6,979 6,979 — — Common stocks 23,744 23,744 — — International developed markets funds 7,870 7,870 — — Emerging markets funds 2,062 2,062 — — Total $ 108,260 $ 44,374 $ 63,886 $ — (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
Future Benefit Payments	The following future benefit payments are expected to be paid: (In thousands) 2019 $ 7,163 2020 7,353 2021 7,510 2022 7,473 2023 7,509 2024 - 2028 36,468

Stock-Based Compensation and _2

Stock-Based Compensation and Directors Stock Purchase Plan (Tables)	12 Months Ended
	Dec. 31, 2018
Share-based Compensation [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, 2018 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2018 1,317,092 $ 36.82 Granted 268,658 57.28 Vested (376,489 ) 30.73 Forfeited (28,321 ) 44.12 Canceled — — Nonvested at December 31, 2018 1,180,940 $ 43.24
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]	2018 2017 2016 Weighted per share average fair value at grant date $11.84 $11.37 $6.47 Assumptions: Dividend yield 1.6 % 1.6 % 2.2 % Volatility 20.6 % 21.1 % 21.2 % Risk-free interest rate 2.7 % 2.4 % 1.8 % Expected term 6.6 years 7.0 years 7.2 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, 2018 1,237,804 $ 35.36 Granted 177,001 55.63 Forfeited (17,529 ) 45.82 Expired (607 ) 43.14 Exercised (330,231 ) 29.96 Outstanding at December 31, 2018 1,066,438 $ 40.22 6.7 years $ 17,218 Exercisable at December 31, 2018 561,527 $ 34.57 5.6 years $ 12,239
Schedule Of Additional Information About Stock Options and SARs Exercises	Additional information about stock options and SARs exercised is presented below. (In thousands) 2018 2017 2016 Intrinsic value of options and SARs exercised $ 9,632 $ 9,310 $ 8,854 Tax benefit realized from options and SARs exercised $ 1,928 $ 2,698 $ 1,781

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
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 (Losses) on Cash Flow Hedge Derivatives (2) Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other 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 ) Balance January 1, 2017 $ 2,975 $ 27,328 $ (19,328 ) $ — $ 10,975 Other comprehensive income (loss) before reclassifications 279 36,307 (2,527 ) — 34,059 Amounts reclassified from accumulated other comprehensive income 385 (31,433 ) 2,042 — (29,006 ) Current period other comprehensive income (loss), before tax 664 4,874 (485 ) — 5,053 Income tax (expense) benefit (252 ) (1,852 ) 184 — (1,920 ) Current period other comprehensive income (loss), net of tax 412 3,022 (301 ) — 3,133 Transfer of unrealized gain on securities for which impairment was not previously recognized 24 (24 ) — — — Balance December 31, 2017 $ 3,411 $ 30,326 $ (19,629 ) $ — $ 14,108 (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. As mentioned in Note 1, new accounting guidance for investment securities, 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, 2018
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, 2018: Net interest income $ 296,228 $ 345,221 $ 46,946 $ 688,395 $ 135,430 $ 823,825 Provision for loan losses (41,280 ) (1,134 ) 32 (42,382 ) (312 ) (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 (287,473 ) (297,847 ) (123,576 ) (708,896 ) (28,925 ) (737,821 ) Income before income taxes $ 93,728 $ 248,767 $ 96,428 $ 438,923 $ 105,240 $ 544,163 Year ended December 31, 2017: Net interest income $ 279,031 $ 329,087 $ 47,264 $ 655,382 $ 78,297 $ 733,679 Provision for loan losses (41,829 ) 205 (41 ) (41,665 ) (3,579 ) (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 (275,734 ) (281,845 ) (120,461 ) (678,040 ) (66,303 ) (744,343 ) Income before income taxes $ 82,830 $ 232,024 $ 84,937 $ 399,791 $ 30,615 $ 430,406 Year ended December 31, 2016: Net interest income $ 268,654 $ 311,704 $ 44,113 $ 624,471 $ 55,578 $ 680,049 Provision for loan losses (36,042 ) 4,378 (122 ) (31,786 ) (4,532 ) (36,318 ) Non-interest income 116,185 187,350 144,661 448,196 (1,640 ) 446,556 Investment securities losses, net — — — — (53 ) (53 ) Non-interest expense (266,258 ) (272,398 ) (113,888 ) (652,544 ) (36,685 ) (689,229 ) Income before income taxes $ 82,539 $ 231,034 $ 74,764 $ 388,337 $ 12,668 $ 401,005
Segment Balance Sheet Data	Segment Balance Sheet Data (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Average balances for 2018: Assets $ 2,541,627 $ 9,115,738 $ 1,243,806 $ 12,901,171 $ 11,765,064 $ 24,666,235 Loans, including held for sale 2,401,657 8,939,696 1,233,780 12,575,133 1,370,439 13,945,572 Goodwill and other intangible assets 78,062 68,300 746 147,108 — 147,108 Deposits 10,210,506 8,029,248 1,871,596 20,111,350 19,902 20,131,252 Average balances for 2017: Assets $ 2,610,045 $ 8,830,584 $ 1,218,598 $ 12,659,227 $ 12,372,381 $ 25,031,608 Loans, including held for sale 2,471,578 8,635,035 1,209,792 12,316,405 1,312,746 13,629,151 Goodwill and other intangible assets 76,734 68,538 746 146,018 — 146,018 Deposits 10,190,613 8,301,004 2,090,582 20,582,199 12,587 20,594,786

Common and Preferred Stock (Tab

Common and Preferred Stock (Tables)	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 2016 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 433,542 $ 319,383 $ 275,391 Less preferred stock dividends 9,000 9,000 9,000 Net income available to common shareholders 424,542 310,383 266,391 Less income allocated to nonvested restricted stock 4,558 3,848 3,698 Net income allocated to common stock $ 419,984 $ 306,535 $ 262,693 Weighted average common shares outstanding 110,812 110,833 110,505 Basic income per common share $ 3.79 $ 2.77 $ 2.38 Diluted income per common share: Net income available to common shareholders $ 424,542 $ 310,383 $ 266,391 Less income allocated to nonvested restricted stock 4,547 3,838 3,692 Net income allocated to common stock $ 419,995 $ 306,545 $ 262,699 Weighted average common shares outstanding 110,812 110,833 110,505 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 343 391 295 Weighted average diluted common shares outstanding 111,155 111,224 110,800 Diluted income per common share $ 3.78 $ 2.76 $ 2.37
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) 2018 2017 2016 Shares outstanding at January 1 106,615 101,461 97,226 Issuance of stock: Awards and sales under employee and director plans 416 403 397 5% stock dividend 5,305 5,078 4,831 Other purchases of treasury stock (1,194 ) (315 ) (959 ) Other (13 ) (12 ) (34 ) Shares outstanding at December 31 111,129 106,615 101,461

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [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, 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 % December 31, 2017 Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,747,863 14.35 % $ 1,531,996 8.00 % N.A. N.A. Commerce Bank 2,428,789 12.76 1,522,361 8.00 $ 1,902,951 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,567,264 13.41 % $ 1,148,997 6.00 % N.A. N.A. Commerce Bank 2,268,131 11.92 1,141,771 6.00 $ 1,522,361 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,422,480 12.65 % $ 861,748 4.50 % N.A. N.A. Commerce Bank 2,268,131 11.92 856,328 4.50 $ 1,236,918 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,567,264 10.39 % $ 988,653 4.00 % N.A. N.A. Commerce Bank 2,268,131 9.20 986,240 4.00 $ 1,232,800 5.00 %

Revenue from Contracts with C_2

Revenue from Contracts with Customers Revenue from Contracts with Customers (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Reclassification of Bank Card Transaction Fees [Table Text Block]	The Company has concluded that the new guidance did not require any significant change to its 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 years ended December 31, 2017 and 2016 . For the year ended December 31, 2017 For the Year Ended December 31, 2016 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 180,441 $ (25,341 ) $ 155,100 $ 181,879 $ (27,836 ) $ 154,043 Total non-interest income 486,604 (25,341 ) 461,263 474,392 (27,836 ) 446,556 Non-interest expense: Data processing and software $ 92,246 $ (11,248 ) $ 80,998 $ 92,722 $ (13,133 ) $ 79,589 Other 77,459 (14,093 ) 63,366 74,202 (14,703 ) 59,499 Total non-interest expense 769,684 (25,341 ) 744,343 717,065 (27,836 ) 689,229
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) 2018 2017 2016 Bank card transaction fees $ 171,576 $ 155,100 $ 154,043 Trust fees 147,964 135,159 121,795 Deposit account charges and other fees 94,517 90,060 86,394 Consumer brokerage services 15,807 14,630 13,784 Other non-interest income 37,440 30,128 31,326 Total non-interest income from contracts with customers 467,304 425,077 407,342 Other non-interest income (a) 34,037 36,186 39,214 Total non-interest income $ 501,341 $ 461,263 $ 446,556 (a) 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, 2018 and 2017 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) December 31, 2018 December 31, 2017 December 31, 2016 Bank card transaction fees $ 13,035 $ 13,315 $ 14,686 Trust fees 2,721 2,802 2,681 Deposit account charges and other fees 6,107 5,597 5,735 Consumer brokerage services 559 380 309
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) 2018 2017 2016 Debit card: Fee income $ 41,522 $ 40,134 $ 39,430 Expense for network charges (1,784 ) (4,498 ) (5,989 ) Net debit card fees 39,738 35,636 33,441 Credit card: Fee income 26,799 25,275 24,650 Expense for network charges and rewards (13,834 ) (10,699 ) (9,816 ) Net credit card fees 12,965 14,576 14,834 Corporate card: Fee income 199,651 179,642 166,576 Expense for network charges and rewards (100,011 ) (94,823 ) (83,851 ) Net corporate card fees 99,640 84,819 82,725 Merchant: Fee income 30,241 31,863 37,407 Fees to cardholder banks (7,831 ) (8,228 ) (9,585 ) Expense for network charges (3,177 ) (3,566 ) (4,779 ) Net merchant fees 19,233 20,069 23,043 Total bank card transaction fees $ 171,576 $ 155,100 $ 154,043 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. For the Years Ended December 31 (In thousands) 2018 2017 2016 Private client $ 111,533 $ 100,358 $ 90,992 Institutional 29,241 27,477 24,565 Other 7,190 7,324 6,238 Total trust fees $ 147,964 $ 135,159 $ 121,795 This revenue is reported in the Wealth segment.
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) 2018 2017 2016 Corporate cash management fees $ 38,468 $ 36,044 $ 36,131 Overdraft and return item fees 31,468 30,576 29,350 Other service charges on deposit accounts 24,581 23,440 20,913 Total deposit account charges and other fees $ 94,517 $ 90,060 $ 86,394 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. For the Years Ended December 31 (In thousands) 2018 2017 2016 Commission income $ 8,956 $ 8,400 $ 8,170 Managed account services 6,851 6,230 5,614 Total consumer brokerage services $ 15,807 $ 14,630 $ 13,784 Nearly all of this revenue is reported in the Company's Wealth segment.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017 . 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, 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 December 31, 2017 Assets: Residential mortgage loans held for sale $ 15,327 $ — $ 15,327 $ — Available for sale debt securities: U.S. government and federal agency obligations 917,147 917,147 — — Government-sponsored enterprise obligations 406,363 — 406,363 — State and municipal obligations 1,611,366 — 1,594,350 17,016 Agency mortgage-backed securities 3,040,913 — 3,040,913 — Non-agency mortgage-backed securities 905,793 — 905,793 — Asset-backed securities 1,492,800 — 1,492,800 — Other debt securities 351,060 — 351,060 — Trading debt securities 18,269 — 18,269 — Equity securities 48,838 19,864 28,974 — Private equity investments 55,752 — — 55,752 Derivatives * 8,349 — 7,723 626 Assets held in trust for deferred compensation plan 12,843 12,843 — — Total assets 8,884,820 949,854 7,861,572 73,394 Liabilities: Derivatives * 8,074 — 7,951 123 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — Total liabilities $ 20,917 $ 12,843 $ 7,951 $ 123 * The fair value of each class of derivative is shown in Note 18. .
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, 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 Year ended December 31, 2017: Balance at January 1, 2017 $ 16,682 $ 50,820 $ 258 $ 67,760 Total gains or losses (realized/unrealized): Included in earnings — (5,833 ) 266 (5,567 ) Included in other comprehensive income 882 — — 882 Investment securities called (600 ) — — (600 ) Discount accretion 52 — — 52 Purchases of private equity securities — 13,352 — 13,352 Sale / pay down of private equity securities — (2,621 ) — (2,621 ) Capitalized interest/dividends — 34 — 34 Purchase of risk participation agreement — — 70 70 Sale of risk participation agreement — — (91 ) (91 ) Balance at December 31, 2017 $ 17,016 $ 55,752 $ 503 $ 73,271 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, 2017 $ — $ (5,658 ) $ 615 $ (5,043 )
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, 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 Year ended December 31, 2017: Total gains or losses included in earnings $ 231 $ 35 $ (5,833 ) $ (5,567 ) Change in unrealized gains or losses relating to assets still held at December 31, 2017 $ 580 $ 35 $ (5,658 ) $ (5,043 )
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 $14.2 million at December 31, 2018 , while private equity investments, included in other securities, totaled $85.7 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 4 - 5 years Estimated market rate 4.3% - 4.8% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 53.7% - 98.0% 78.6% Embedded servicing value .7% - 2.3% 1.3%
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 2018 and 2017 , and still held as of December 31, 2018 and 2017 , 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, 2018 and 2017 . 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, 2018 Collateral dependent impaired loans $ 294 $ — $ — $ 294 $ (269 ) Mortgage servicing rights 6,478 — — 6,478 9 Long-lived assets 914 — — 914 (552 ) Balance at December 31, 2017 Collateral dependent impaired loans $ 1,236 $ — $ — $ 1,236 $ (617 ) Mortgage servicing rights 4,653 — — 4,653 13 Foreclosed assets — — — — (9 ) Long-lived assets 3,378 — — 3,378 (724 )

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
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 measurements within the valuation hierarchy are as follows at December 31, 2018 and 2017 : 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 — — 8,702 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 $ 13,328 $ 3,617,001 $ 22,322,004 Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,958,554 $ — $ — $ 4,971,401 $ 4,971,401 Real estate - construction and land 968,820 — — 979,389 979,389 Real estate - business 2,697,452 — — 2,702,598 2,702,598 Real estate - personal 2,062,787 — — 2,060,443 2,060,443 Consumer 2,104,487 — — 2,074,129 2,074,129 Revolving home equity 400,587 — — 400,333 400,333 Consumer credit card 783,864 — — 798,093 798,093 Overdrafts 7,123 — — 7,123 7,123 Total loans 13,983,674 — — 13,993,509 13,993,509 Loans held for sale 21,398 — 21,398 — 21,398 Investment securities 8,893,307 937,011 7,838,522 117,774 8,893,307 Federal funds sold 42,775 42,775 — — 42,775 Securities purchased under agreements to resell 700,000 — — 695,194 695,194 Interest earning deposits with banks 30,631 30,631 — — 30,631 Cash and due from banks 438,439 438,439 — — 438,439 Derivative instruments 8,349 — 7,723 626 8,349 Assets held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 24,131,416 $ 1,461,699 $ 7,867,643 $ 14,807,103 $ 24,136,445 Financial Liabilities Non-interest bearing deposits $ 7,158,962 $ 7,158,962 $ — $ — $ 7,158,962 Savings, interest checking and money market deposits 11,499,620 11,499,620 — — 11,499,620 Certificates of deposit 1,766,864 — — 1,768,780 1,768,780 Federal funds purchased 202,370 202,370 — — 202,370 Securities sold under agreements to repurchase 1,304,768 — — 1,305,375 1,305,375 Other borrowings 1,758 — — 1,758 1,758 Derivative instruments 8,074 — 7,951 123 8,074 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 21,955,259 $ 18,873,795 $ 7,951 $ 3,076,036 $ 21,957,782

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
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. At December 31, 2018 , 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) 2018 2017 Interest rate swaps $ 2,006,280 $ 1,741,412 Interest rate floors 1,000,000 — Interest rate caps 62,163 31,776 Credit risk participation agreements 143,460 133,488 Foreign exchange contracts 6,206 11,826 Mortgage loan commitments 14,544 17,110 Mortgage loan forward sale contracts 5,768 2,566 Forward TBA contracts 16,500 25,000 Total notional amount $ 3,254,921 $ 1,963,178
Schedule Of Fair Values Of Derivative Instruments	The fair values of the Company’s derivative instruments are shown in the table below. Information about the valuation methods used to measure fair value is provided in Note 16 on Fair Value Measurements. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. As mentioned in Note 16, effective January 2017, 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, 2018 in the table below, 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 . At December 31, 2017 , the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million . Asset Derivatives Liability Derivatives December 31 December 31 2018 2017 2018 2017 (In thousands ) Fair Value Fair Value Derivatives designated as hedging instruments: Interest rate floors $ 29,031 $ — $ — $ — Total derivatives designated as hedging instruments $ 29,031 $ — $ — $ — Derivatives not designated as hedging instruments: Interest rate swaps $ 11,537 $ 7,674 $ (13,110 ) $ (7,857 ) Interest rate caps 24 16 (24 ) (16 ) Credit risk participation agreements 47 46 (93 ) (123 ) Foreign exchange contracts 20 21 (8 ) (40 ) Mortgage loan commitments 536 580 — — Mortgage loan forward sale contracts 15 8 (8 ) (7 ) Forward TBA contracts — 4 (178 ) (31 ) Total derivatives not designated as hedging instruments $ 12,179 $ 8,349 $ (13,421 ) $ (8,074 ) Total $ 41,210 $ 8,349 $ (13,421 ) $ (8,074 )
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 For the Year Ended December 31 For the Year Ended December 31 (In thousands) 2018 2018 Derivatives in cash flow hedging relationships: Interest rate floors* (a) $ 8,381 Interest and fees on loans $ (760 ) Total $ 8,381 $ (760 ) * No hedging relationship existed during 2017 and 2016. (a) Amounts shown herein were excluded from the assessment of effectiveness, as they represent the time value component of derivative gains (losses).
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) 2018 2017 2016 Derivative instruments: Interest rate swaps Other non-interest income $ 3,914 $ 1,978 $ 5,927 Interest rate caps Other non-interest income 11 — — Credit risk participation agreements Other non-interest income 150 35 (44 ) Foreign exchange contracts: Other non-interest income 31 (80 ) 55 Mortgage loan commitments Loan fees and sales (45 ) 231 87 Mortgage loan forward sale contracts Loan fees and sales 5 64 (63 ) Forward TBA contracts Loan fees and sales 414 (648 ) 79 Total $ 4,480 $ 1,580 $ 6,041
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, 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 December 31, 2017 Assets: Derivatives subject to master netting agreements $ 7,726 $ — $ 7,726 $ (233 ) $ (824 ) $ 6,669 Derivatives not subject to master netting agreements 623 — 623 Total derivatives 8,349 — 8,349 Liabilities: Derivatives subject to master netting agreements 7,935 — 7,935 (233 ) (1,570 ) 6,132 Derivatives not subject to master netting agreements 139 — 139 Total derivatives 8,074 — 8,074

Resale and Repurchase Agreeme_2

Resale and Repurchase Agreements Resale and Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2018
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, 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 ) — December 31, 2017 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,954,768 (650,000 ) 1,304,768 — (1,304,768 ) —
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, 2018 and 2017 , 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, 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 December 31, 2017 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 271,820 $ 1,731 $ 450,000 $ 723,551 Government-sponsored enterprise obligations 149,111 — — 149,111 Agency mortgage-backed securities 737,975 9,750 200,000 947,725 Asset-backed securities 89,601 30,000 — 119,601 Other debt securities 14,780 — — 14,780 Total repurchase agreements, gross amount recognized $ 1,263,287 $ 41,481 $ 650,000 $ 1,954,768

Commitments, Contingencies An_2

Commitments, Contingencies And Guarantees (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Summary Of Minimum Lease Commitments	A summary of minimum lease commitments follows: (In thousands) Type of Property Year Ended December 31 Real Property Equipment Total 2019 $ 5,659 $ 104 $ 5,763 2020 4,766 51 4,817 2021 4,027 28 4,055 2022 3,598 — 3,598 2023 3,273 — 3,273 After 15,161 — 15,161 Total minimum lease payments $ 36,667
Schedule Of Off-Balance Sheet Instruments Commitments	The following table summarizes these commitments at December 31: (In thousands) 2018 2017 Commitments to extend credit: Credit card $ 5,328,502 $ 5,102,556 Other 5,840,967 5,737,181 Standby letters of credit, net of participations 353,905 387,811 Commercial letters of credit 13,774 4,498

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 , Tower owned 201,901 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) 2018 2017 2016 Leasing agent fees $ 133 $ 32 $ 101 Operation of parking garages 95 82 184 Building management fees 1,935 1,954 1,832 Property construction management fees 136 146 147 Dividends paid on Company stock held by Tower 181 232 221 Total $ 2,480 $ 2,446 $ 2,485

Parent Company Condensed Fina_2

Parent Company Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets December 31 (In thousands) 2018 2017 Assets Investment in consolidated subsidiaries: Bank $ 2,587,489 $ 2,409,098 Non-banks 67,538 52,479 Cash 207,462 151,607 Investment securities: Available for sale debt 2,576 4,595 Equity 3,191 49,345 Note receivable due from bank subsidiary 50,000 50,000 Advances to subsidiaries, net of borrowings 19,867 14,571 Income tax benefits 8,590 8,279 Other assets 23,734 19,951 Total assets $ 2,970,447 $ 2,759,925 Liabilities and stockholders’ equity Pension obligation $ 12,645 $ 12,407 Other liabilities 26,504 30,958 Total liabilities 39,149 43,365 Stockholders’ equity 2,931,298 2,716,560 Total liabilities and stockholders’ equity $ 2,970,447 $ 2,759,925
Condensed Statements Of Income	Condensed Statements of Income For the Years Ended December 31 (In thousands) 2018 2017 2016 Income Dividends received from consolidated bank subsidiary $ 200,000 $ 160,002 $ 160,002 Earnings of consolidated subsidiaries, net of dividends 233,785 147,678 118,704 Interest and dividends on investment securities 10,698 2,099 2,364 Management fees charged to subsidiaries 37,688 30,431 30,965 Investment securities gains (losses) (4,581 ) 41,717 1,880 Net interest income on advances and note to subsidiaries 1,299 514 21 Other 2,390 3,346 2,720 Total income 481,279 385,787 316,656 Expense Salaries and employee benefits 33,588 33,714 29,116 Professional fees 2,383 2,036 1,951 Data processing fees paid to affiliates 3,341 3,512 3,226 Community service 152 32,093 1,620 Other 10,729 10,671 9,849 Total expense 50,193 82,026 45,762 Income tax benefit (2,456 ) (15,622 ) (4,497 ) Net income $ 433,542 $ 319,383 $ 275,391
Condensed Statements Of Cash Flows	Condensed Statements of Cash Flows For the Years Ended December 31 (In thousands ) 2018 2017 2016 Operating Activities Net income $ 433,542 $ 319,383 $ 275,391 Adjustments to reconcile net income to net cash provided by operating activities: Earnings of consolidated subsidiaries, net of dividends (233,785 ) (147,678 ) (118,704 ) Other adjustments, net 2,505 (11,268 ) 9,541 Net cash provided by operating activities 202,262 160,437 166,228 Investing Activities (Increase) decrease in securities purchased under agreements to resell — 155,775 (51,335 ) Decrease in investment in subsidiaries, net — 11 4 Proceeds from sales of investment securities 41,638 11,006 2,949 Proceeds from maturities/pay downs of investment securities 1,988 2,295 4,105 Purchases of investment securities (125 ) — — Note receivable due from bank subsidiary — (50,000 ) — (Increase) decrease in advances to subsidiaries, net (5,296 ) (9,518 ) 13,507 Net purchases of building improvements and equipment (133 ) (52 ) (3 ) Net cash provided by (used in) investing activities 38,072 109,517 (30,773 ) Financing Activities Purchases of treasury stock (75,231 ) (17,771 ) (39,381 ) Issuance of stock under equity compensation plans (10 ) (8 ) (6 ) Cash dividends paid on common stock (100,238 ) (91,619 ) (87,070 ) Cash dividends paid on preferred stock (9,000 ) (9,000 ) (9,000 ) Net cash used in financing activities (184,479 ) (118,398 ) (135,457 ) Increase (decrease) in cash 55,855 151,556 (2 ) Cash at beginning of year 151,607 51 53 Cash at end of year $ 207,462 $ 151,607 $ 51 Income tax receipts, net $ (1,965 ) $ (8,991 ) $ (8,958 )

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2018
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, 2018USD ($)Locations	Dec. 31, 2017USD ($)
Locations | Locations	320
Restricted Cash and Cash Equivalents	$ 8,200	$ 12,500
Federal Reserve Bank Reserve Requirement	228,300
Cash Held at Federal Reserve Bank	$ 689,900
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%
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 33,320
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ (1,297)

Loans And Allowance For Loan _3

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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	5,300,000,000
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	3,700,000,000
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	752,200,000	$ 737,700,000
Deferred income on direct financing and sales-type leases	62,600,000	52,100,000
Property Subject to or Available for Operating Lease, Net	16,100,000	17,400,000
Decrease in interest income resulting from modification to credit card loans	(1,000,000)
Commitments to lend additional funds to customers with restructured loans	1,800,000	7,600,000
Loans Held-for-sale, Fair Value Disclosure	13,529,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	13,000,000
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	7,200,000
HFS Student Loans on Non-Accrual Status	0
HFS Student Loans Past Due	0
Foreclosed real estate	1,400,000	681,000
Personal property acquired in repossession	$ 2,000,000	$ 2,700,000

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, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 14,140,298	$ 13,983,674
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	5,106,427	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	869,659	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,875,788	2,697,452
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,127,083	2,062,787
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,955,572	2,104,487
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	376,399	400,587
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	814,134	783,864
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 15,236	$ 7,123

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, 2018USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans to directors and executive officers, beginning balance	$ 47,225
Additions	127,253
Amounts collected	(128,540)
Amounts written off	0
Loans to directors and executive officers, ending balance	$ 45,938

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 159,532	$ 155,932	$ 151,532
Provision for loan losses	42,694	45,244	36,318
Loans charged off	55,821	55,179	50,978
Less recoveries	13,527	13,535	19,060
Net loans charged-off (recoveries)	42,294	41,644	31,918
Balance at end of period	159,932	159,532	155,932
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	93,704	91,361	82,086
Provision for loan losses	254	2,327	4,898
Loans charged off	3,164	2,538	3,258
Less recoveries	2,075	2,554	7,635
Net loans charged-off (recoveries)	1,089	(16)	(4,377)
Balance at end of period	92,869	93,704	91,361
Personal Banking Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	65,828	64,571	69,446
Provision for loan losses	42,440	42,917	31,420
Loans charged off	52,657	52,641	47,720
Less recoveries	11,452	10,981	11,425
Net loans charged-off (recoveries)	41,205	41,660	36,295
Balance at end of period	$ 67,063	$ 65,828	$ 64,571

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, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	$ 2,696	$ 4,243
All other loans, Allowance for loan losses	157,236	155,289
Impaired loans, Loans outstanding	78,616	114,795
All other loans, Loans outstanding	14,061,682	13,868,879
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	1,780	3,067
All other loans, Allowance for loan losses	91,089	90,637
Impaired loans, Loans outstanding	61,496	92,613
All other loans, Loans outstanding	8,790,378	8,532,213
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	916	1,176
All other loans, Allowance for loan losses	66,147	64,652
Impaired loans, Loans outstanding	17,120	22,182
All other loans, Loans outstanding	$ 5,271,304	$ 5,336,666

Loans And Allowance For Loan _8

Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 12,536	$ 11,983
Restructured loans (accruing)	66,080	102,812
Total impaired loans	$ 78,616	$ 114,795

Loans And Allowance For Loan _9

Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 78,616,000	$ 114,795,000
Impaired Financing Receivable, Unpaid Principal Balance	87,074,000	122,429,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,725,000	7,434,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,477,000	11,120,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	69,891,000	107,361,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	72,597,000	111,309,000
Impaired Financing Receivable, Related Allowance	2,696,000	4,243,000
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,725,000	5,356,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	14,477,000	9,000,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	40,286,000	72,589,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	40,582,000	73,168,000
Impaired Financing Receivable, Related Allowance	1,223,000	2,455,000
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	416,000	837,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	421,000	841,000
Impaired Financing Receivable, Related Allowance	11,000	27,000
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	1,299,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	1,303,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,069,000	12,532,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,699,000	13,071,000
Impaired Financing Receivable, Related Allowance	546,000	585,000
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,461,000	9,126,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,236,000	11,914,000
Impaired Financing Receivable, Related Allowance	266,000	532,000
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	779,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	817,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,510,000	5,388,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,510,000	5,426,000
Impaired Financing Receivable, Related Allowance	38,000	67,000
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	40,000	204,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	40,000	204,000
Impaired Financing Receivable, Related Allowance	1,000	11,000
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,109,000	6,685,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,109,000	6,685,000
Impaired Financing Receivable, Related Allowance	$ 611,000	$ 566,000

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, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 9,741	$ 13,647
Restructured loans (accruing)	89,787	66,609
Average impaired loans	99,528	80,256
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	7,619	9,658
Restructured loans (accruing)	73,261	49,070
Average impaired loans	80,880	58,728
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	2,122	3,989
Restructured loans (accruing)	16,526	17,539
Average impaired loans	$ 18,648	$ 21,528

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 3,995	$ 5,082	$ 2,481
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	2,219	3,135	1,064
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	25	41	2
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	558	514	171
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	139	402	152
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	305	307	339
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	3	10	31
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 746	$ 673	$ 722

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, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 14,038,417	$ 13,897,272
30 – 89 Days Past Due	72,687	56,292
90 Days Past Due and Still Accruing	16,658	18,127
Non-accrual	12,536	11,983
Total	14,140,298	13,983,674
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	5,106,427	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	869,659	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,875,788	2,697,452
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,127,083	2,062,787
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,955,572	2,104,487
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	376,399	400,587
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	814,134	783,864
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	15,236	7,123
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	5,086,912	4,949,148
30 – 89 Days Past Due	10,057	3,085
90 Days Past Due and Still Accruing	473	374
Non-accrual	8,985	5,947
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	867,692	967,321
30 – 89 Days Past Due	1,963	1,473
90 Days Past Due and Still Accruing	0	21
Non-accrual	4	5
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,867,347	2,694,234
30 – 89 Days Past Due	6,704	482
90 Days Past Due and Still Accruing	22	0
Non-accrual	1,715	2,736
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	2,118,045	2,050,787
30 – 89 Days Past Due	6,041	6,218
90 Days Past Due and Still Accruing	1,165	3,321
Non-accrual	1,832	2,461
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	1,916,320	2,067,025
30 – 89 Days Past Due	35,608	32,674
90 Days Past Due and Still Accruing	3,644	3,954
Non-accrual	0	834
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	374,830	397,349
30 – 89 Days Past Due	875	1,962
90 Days Past Due and Still Accruing	694	1,276
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	792,334	764,568
30 – 89 Days Past Due	11,140	10,115
90 Days Past Due and Still Accruing	10,660	9,181
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	14,937	6,840
30 – 89 Days Past Due	299	283
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, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 8,851,874	$ 8,624,826
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,558,943	8,288,517
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	138,153	120,368
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	144,074	207,253
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	10,704	8,688
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,106,427	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	869,659	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,875,788	2,697,452
Commercial Portfolio Segment [Member] | Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,915,042	4,740,013
Commercial Portfolio Segment [Member] | Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	84,391	59,177
Commercial Portfolio Segment [Member] | Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	98,009	153,417
Commercial Portfolio Segment [Member] | Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,985	5,947
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	866,527	955,499
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	1,917	10,614
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	1,211	2,702
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	4	5
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,777,374	2,593,005
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	51,845	50,577
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	44,854	51,134
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	$ 1,715	$ 2,736

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, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Abstract]
Credit Quality Personal Real Estate Loans Excluded	$ 201.7	$ 219.2
Consumer Healthcare Loans Excluded	$ 170.3	$ 145
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	1.10%	1.30%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.80%	2.10%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.40%	10.50%
Real Estate - Personal [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	24.70%	25.60%
Real Estate - Personal [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	63.00%	60.50%
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	3.10%	3.30%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.80%	5.50%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	16.10%	17.30%
Consumer [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.70%	26.80%
Consumer [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	50.30%	47.10%
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	0.80%	1.10%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.70%	1.70%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.10%	9.50%
Revolving Home Equity [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	24.00%	21.40%
Revolving Home Equity [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	64.40%	66.30%
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	4.40%	4.70%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	14.00%	14.40%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	34.80%	34.40%
Consumer Credit Card [Member] | 720 - 779 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.40%	26.00%
Consumer Credit Card [Member] | 780 and over [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	20.40%	20.50%

Loans And Allowance For Loan_15

Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	$ 75,839	$ 110,608
Balance 90 days past due at any time during previous 12 months	903
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	48,777
Balance 90 days past due at any time during previous 12 months	25
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	412
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	10,355
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	3,636
Balance 90 days past due at any time during previous 12 months	158
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,510
Balance 90 days past due at any time during previous 12 months	50
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	40
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	7,109
Balance 90 days past due at any time during previous 12 months	$ 670

Loans And Allowance For Loan_16

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, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Restructured loans	$ 75,839	$ 110,608
Performing/Accruing TDR Commercial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	50,904	88,588
Performing/AccruingTDR - Assistance programs [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	7,410	6,941
Performing/Accruing TDR - Consumer Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	4,103	3,916
Performing/Accruing TDR - Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	3,663	3,367
TDR Non-accrual loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	$ 9,759	$ 7,796

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Investments_In_Single_Issuer	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Investment [Line Items]
Equity Securities, FV-NI, Cost	$ 2,500
Equity Securities, FV-NI	2,585	$ 48,838
Equity securities redeemed for cash due to a third-party merger	39,900
Equity Securities, FV-NI, Unrealized Gain (Loss)	(332)
Equtiy Securities without Readily Determinable Fair Values	1,824	1,753
U.S. Treasury inflation-protected securities held	434,400
Auction rate securities held at fair value	$ 14,200
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 57,700	68,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	14,092	14,199	$ 14,080	$ 14,129
Portfolio securities aggregate fair value loss position	5,435,496	5,172,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	99,824	44,122
Available for sale securities in loss position at period end, change in unrealized loss	55,700
Securities pledged as collateral	4,300,000	3,800,000
Securities pledged and may be sold or re-pledged	$ 463,300
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%
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 14,100
Par value securities with other-than-temporary impairment	23,400
Fair Value Securities with Other-Than-Temporary Impairment	18,400
Portfolio securities aggregate fair value loss position	865,191	730,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,779	$ 4,837
Accounting Standards Update 2016-01 [Member]
Investment [Line Items]
Unrealized gain previously recorded in AOCI reclassified to retained earnings at adoption of ASU 2016-01	$ (33,320)

Investment Securities (Investme

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale	$ 8,538,041	$ 8,725,442
Trading securities	27,059	18,269
Equity Securities, FV-NI	2,585	48,838
Equtiy Securities without Readily Determinable Fair Values	1,824	1,753
Federal Reserve Bank Stock	33,498	33,253
Federal Home Loan Bank Stock	10,000	10,000
Private Equity Investments	85,659	55,752
Total investment securities	$ 8,698,666	$ 8,893,307

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 8,602,599	$ 8,715,456
Debt Securities, Available-for-sale, Fair Value		8,538,041	8,725,442
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		914,486	917,494
Debt Securities, Available-for-sale, Fair Value		$ 907,652	917,147
Weighted Average Yield	[1]	1.63%
U.S. Government And Federal Agency Obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 23,577
Debt Securities, Available-for-sale, Fair Value		$ 23,518
Weighted Average Yield	[1]	(0.04%)
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		$ 434,973
Debt Securities, Available-for-sale, Fair Value		$ 435,690
Weighted Average Yield	[1]	1.90%
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		$ 386,708
Debt Securities, Available-for-sale, Fair Value		$ 381,419
Weighted Average Yield	[1]	1.61%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 69,228
Debt Securities, Available-for-sale, Fair Value		$ 67,025
Weighted Average Yield	[1]	0.64%
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 199,470	408,266
Debt Securities, Available-for-sale, Fair Value		$ 195,778	406,363
Weighted Average Yield		2.32%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 24,991
Debt Securities, Available-for-sale, Fair Value		$ 24,743
Weighted Average Yield		1.53%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 96,601
Debt Securities, Available-for-sale, Fair Value		$ 95,619
Weighted Average Yield		2.03%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 34,985
Debt Securities, Available-for-sale, Fair Value		$ 34,460
Weighted Average Yield		2.71%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 42,893
Debt Securities, Available-for-sale, Fair Value		$ 40,956
Weighted Average Yield		3.10%
State and municipal obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 1,322,785	1,592,707
Debt Securities, Available-for-sale, Fair Value		$ 1,328,039	1,611,366
Weighted Average Yield		2.50%
State and municipal obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 98,429
Debt Securities, Available-for-sale, Fair Value		$ 98,675
Weighted Average Yield		2.45%
State and municipal obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 656,762
Debt Securities, Available-for-sale, Fair Value		$ 659,525
Weighted Average Yield		2.37%
State and municipal obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 493,994
Debt Securities, Available-for-sale, Fair Value		$ 496,997
Weighted Average Yield		2.58%
State and municipal obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 73,600
Debt Securities, Available-for-sale, Fair Value		$ 72,842
Weighted Average Yield		3.22%
Agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 3,253,433	3,046,701
Debt Securities, Available-for-sale, Fair Value		$ 3,214,985	3,040,913
Weighted Average Yield		2.85%
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 1,053,854	903,920
Debt Securities, Available-for-sale, Fair Value		$ 1,047,716	905,793
Weighted Average Yield		2.85%
Asset-backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 1,518,976	1,495,380
Debt Securities, Available-for-sale, Fair Value		$ 1,511,614	1,492,800
Weighted Average Yield		2.62%
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 5,826,263	5,446,001
Debt Securities, Available-for-sale, Fair Value		$ 5,774,315	5,439,506
Weighted Average Yield		2.79%
Other Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 339,595	350,988
Debt Securities, Available-for-sale, Fair Value		332,257	$ 351,060
Other Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		16,500
Debt Securities, Available-for-sale, Fair Value		16,418
Other Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		249,870
Debt Securities, Available-for-sale, Fair Value		245,319
Other Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		73,225
Debt Securities, Available-for-sale, Fair Value		$ 70,520
[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, 2018	Dec. 31, 2017
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 8,602,599	$ 8,715,456
Available For Sale Securities, Gross Unreailzed Gain at Period End	35,266	54,108
Available For Sale Securities, Gross Unrealized Loss at Period End	(99,824)	(44,122)
Debt Securities, Available-for-sale, Fair Value	8,538,041	8,725,442
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	914,486	917,494
Available For Sale Securities, Gross Unreailzed Gain at Period End	4,545	4,096
Available For Sale Securities, Gross Unrealized Loss at Period End	(11,379)	(4,443)
Debt Securities, Available-for-sale, Fair Value	907,652	917,147
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	199,470	408,266
Available For Sale Securities, Gross Unreailzed Gain at Period End	55	26
Available For Sale Securities, Gross Unrealized Loss at Period End	(3,747)	(1,929)
Debt Securities, Available-for-sale, Fair Value	195,778	406,363
State and municipal obligations [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,322,785	1,592,707
Available For Sale Securities, Gross Unreailzed Gain at Period End	10,284	21,413
Available For Sale Securities, Gross Unrealized Loss at Period End	(5,030)	(2,754)
Debt Securities, Available-for-sale, Fair Value	1,328,039	1,611,366
Agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,253,433	3,046,701
Available For Sale Securities, Gross Unreailzed Gain at Period End	9,820	17,956
Available For Sale Securities, Gross Unrealized Loss at Period End	(48,268)	(23,744)
Debt Securities, Available-for-sale, Fair Value	3,214,985	3,040,913
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,053,854	903,920
Available For Sale Securities, Gross Unreailzed Gain at Period End	6,641	6,710
Available For Sale Securities, Gross Unrealized Loss at Period End	(12,779)	(4,837)
Debt Securities, Available-for-sale, Fair Value	1,047,716	905,793
Asset-backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,518,976	1,495,380
Available For Sale Securities, Gross Unreailzed Gain at Period End	3,849	2,657
Available For Sale Securities, Gross Unrealized Loss at Period End	(11,211)	(5,237)
Debt Securities, Available-for-sale, Fair Value	1,511,614	1,492,800
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,826,263	5,446,001
Available For Sale Securities, Gross Unreailzed Gain at Period End	20,310	27,323
Available For Sale Securities, Gross Unrealized Loss at Period End	(72,258)	(33,818)
Debt Securities, Available-for-sale, Fair Value	5,774,315	5,439,506
Other Debt Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	339,595	350,988
Available For Sale Securities, Gross Unreailzed Gain at Period End	72	1,250
Available For Sale Securities, Gross Unrealized Loss at Period End	(7,410)	(1,178)
Debt Securities, Available-for-sale, Fair Value	$ 332,257	$ 351,060

Investment Securities (Cash Flo

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Dec. 31, 2018
Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	8.00%
Credit support	0.00%
Loss severity	13.00%
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, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	$ 14,092	$ 14,199	$ 14,080	$ 14,129
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	58	111	0
Credit losses on debt securities for which impairment was previously recognized	10	274	270
Increase in expected cash flows that are recognized over the remaining life of the security	$ (175)	$ (266)	$ (319)

Investment Securities (Securiti

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Less than 12 months, Fair Value	$ 1,213,809	$ 4,015,697
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	11,098	24,201
12 months or longer, Fair Value	4,221,687	1,156,715
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	88,726	19,921
Total, Fair Value	5,435,496	5,172,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	99,824	44,122
US Treasury and Government [Member]
Investment [Line Items]
Less than 12 months, Fair Value	317,699	618,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,515	4,443
12 months or longer, Fair Value	116,728	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,864	0
Total, Fair Value	434,427	618,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	11,379	4,443
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	0	286,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1,712
12 months or longer, Fair Value	188,846	49,766
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,747	217
Total, Fair Value	188,846	336,159
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3,747	1,929
State and municipal obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	157,838	282,843
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	704	1,752
12 months or longer, Fair Value	257,051	49,339
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,326	1,002
Total, Fair Value	414,889	332,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5,030	2,754
Agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	330,933	1,320,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,502	9,433
12 months or longer, Fair Value	1,927,268	619,300
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	46,766	14,311
Total, Fair Value	2,258,201	1,939,989
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	48,268	23,744
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	207,506	577,017
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,085	2,966
12 months or longer, Fair Value	657,685	153,813
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,694	1,871
Total, Fair Value	865,191	730,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,779	4,837
Asset-backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	147,997	786,048
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	728	3,168
12 months or longer, Fair Value	813,427	264,295
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	10,483	2,069
Total, Fair Value	961,424	1,050,343
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	11,211	5,237
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	686,436	2,683,754
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,315	15,567
12 months or longer, Fair Value	3,398,380	1,037,408
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	68,943	18,251
Total, Fair Value	4,084,816	3,721,162
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	72,258	33,818
Other debt securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	51,836	144,090
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	564	727
12 months or longer, Fair Value	260,682	20,202
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,846	451
Total, Fair Value	312,518	164,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 7,410	$ 1,178

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 667,227	$ 779,793	$ 2,047
Proceeds from sale of equity securities	41,637	10,953	3,026
Proceeds from sales of non-marketable securities	0	1,634	19,307
Total proceeds	708,864	792,380	24,380
Investment securities gains (losses), net	(488)	25,051	(53)
Available-for-sale Securities [Member]
Investment [Line Items]
Loss Realized on Called Bond	0	(254)	0
Gains realized on sales	448	592	109
Loss realized on sales	(10,101)	(10,287)	0
Other-than-temporary impairment recognized on debt securities	(68)	(385)	(270)
Equity securities [Member]
Investment [Line Items]
Gain realized on donation	0	31,074	0
Equity Securities, FV-NI, Realized Gain	1,759	10,653	1,911
Equity Securities, FV-NI, Realized Loss	(8,917)	(10)	(7)
Equity Securities, Fair value adjustments, net	2,542	0	0
Other Investments [Member]
Investment [Line Items]
Gains realized on sales	0	381	2,442
Other securities, loss realized on sales	0	(880)	(499)
Fair value adjustments, net	$ 13,849	$ (5,833)	$ (3,739)

Land, Buildings And Equipment_2

Land, Buildings And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 863,779	$ 852,072
Less accumulated depreciation and amortization	530,660	516,962
Net land, buildings and equipment	333,119	335,110
Depreciation expense	28,600	29,100	$ 30,100
Repairs and maintenance expense	16,900	16,400	16,200
Interest Expense Capitalized on Construction Projects	0	0	$ 0
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	91,603	94,992
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	545,510	540,204
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 226,666	$ 216,876

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0	$ 0
Aggregate amortization expense for intangible assets	1,300	1,300	$ 1,500
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Recognized temporary impairment	0
Aggregate amortization expense for intangible assets	$ (617)	$ (462)

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,609	$ 39,176
Accumulated Amortization	(32,815)	(31,549)
Valuation Allowance	0	(9)
Net Amount	8,794	7,618
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(28,954)	(28,305)
Valuation Allowance	0	0
Net Amount	2,316	2,965
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,339	7,906
Accumulated Amortization	(3,861)	(3,244)
Valuation Allowance	0	(9)
Net Amount	$ 6,478	$ 4,653

Goodwill And Other Intangible_5

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Amortization	$ 1,300	$ 1,300	$ 1,500
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	2,965	3,841
Originations	0	0
Amortization	(649)	(876)
Impairment reversal	0	0
Balance, ending	2,316	2,965	3,841
Mortgage Servicing Rights [Member]
Goodwill [Roll Forward]
Balance, beginning	4,653	2,868
Originations	2,433	2,234
Amortization	(617)	(462)
Impairment reversal	9	13
Balance, ending	$ 6,478	$ 4,653	$ 2,868

Goodwill And Other Intangible_7

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,019	$ 1,273
2,020	1,097
2,021	957
2,022	842
2,023	$ 732

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Total Time Open And Certificates Of Deposit) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Deposits [Abstract]
Due in 2019	$ 1,286,425
Due in 2020	281,717
Due in 2021	54,939
Due in 2022	18,301
Due in 2023	15,933
Thereafter	807
Total	$ 1,658,122

Deposits (Maturities Of Time Op

Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 116,068
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	117,046
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	176,591
Certificates Of Deposit under $100,000, Due in over 12 months	176,386
Certificates Of Deposit under $100,000	586,091
Certificates Of Deposit over $100,000, Due in 3 months or less	446,300
Certificates Of Deposit over $100,000, Due in over 3 through 6 months	245,994
Certificates Of Deposit over $100,000, Due in over 6 through 12 months	184,426
Certificates Of Deposit over $100,000, Due in over 12 months	195,311
Certificates Of Deposit over $100,000	1,072,031
Due in 3 months or less, Total	562,368
Due in over 3 through 6 months, Total	363,040
Due in over 6 through 12 months, Total	361,017
Due in over 12 months, Total	371,697
Total	1,658,122
Aggregate amount of time open and certificates of deposit that exceed the $250,000 FDIC insurance limit	$ 824,000

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Debt Disclosure [Abstract]
Short-term repurchase agreement comprised of non-insured customer funds	$ 1,900
Securities sold short	7.8
FHLB issued letters of credit	$ 217.4

Borrowings (Short-Term Borrowin

Borrowings (Short-Term Borrowings) (Details) - Federal Funds Purchased And Repurchase Agreements [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Year End Weighted Rate	0.90%	0.80%	0.40%
Average Weighted Rate	1.30%	0.70%	0.30%
Average Balance Outstanding	$ 1,514,144	$ 1,462,387	$ 1,266,093
Maximum Outstanding at any Month End	1,981,761	1,984,071	1,723,905
Balance at December 31	$ 1,956,389	$ 1,507,138	$ 1,723,905

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Enacted Tax Rate Used to Revalue Deferred Tax Assets and Liabilities		21.00%
Effective income tax rate reconciliation, at federal statutory income tax rate	21.00%	35.00%	35.00%
Unrecognized Tax Benefits	$ 1,257	$ 1,208	$ 1,228
Unrecognized tax benefits impact the effective tax rate	$ 993	$ 785

Income Taxes (Schedule Of Compo

Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal, Current	$ 90,390	$ 89,154	$ 116,753
State and local, Current	10,223	7,735	9,457
Current, income tax expense (benefit)	100,613	96,889	126,210
U.S. federal, Deferred	3,220	12,190	(2,036)
State and local, Deferred	2,116	1,427	(23)
Deferred, income tax expense (benefit)	5,336	13,617	(2,059)
U.S. federal, Total	93,610	101,344	114,717
State and local, Total	12,339	9,162	9,434
Total income tax expense	$ 105,949	$ 110,506	$ 124,151

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrealized gain (loss) on securities available for sale	$ (18,634)	$ 2,104	$ (13,952)
Components of income Tax Recorded Directly to Equity, Change in Fair Value of Cash Flow Hedge	2,286	0	0
Accumulated pension (benefit) loss	222	(184)	778
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	0	0	(3,390)
Income tax expense (benefit) allocated to stockholders’ equity	$ (16,126)	$ 1,920	$ (16,564)

Income Taxes (Components Of Def

Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Loans, principally due to allowance for loan losses	$ 39,169	$ 40,341
Unrealized losses on available-for-sale securities	16,140	0
Equity-based compensation	7,609	8,201
Deferred compensation	5,911	5,647
Unearned fee income	4,125	3,701
Accrued expenses	2,152	5,245
Private equity investments	2,008	5,473
Deferred tax assets, Other	528	4,430
Total deferred tax assets	77,642	73,038
Equipment lease financing	55,738	45,825
Unrealized gain on securities available for sale	0	13,603
Land, buildings and equipment	14,207	8,592
Undistributed earnings of subsidiaries	0	7,094
Intangibles	5,973	5,732
Deferred tax liabilities, Other	5,309	6,569
Total deferred tax liabilities	81,227	87,415
Net deferred tax assets (liabilities)	$ (3,585)	$ (14,377)

Income Taxes (Schedule Of Compa

Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 113,293	$ 150,461	$ 139,840
Tax-exempt interest, net of cost to carry	(11,502)	(20,295)	(20,033)
Effective Income Tax Rate Reconciliation, Contribution of Appreciated Securities, Amount	0	(10,864)	0
State and local income taxes, net of federal tax benefit	9,748	5,955	6,132
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	(6,753)	0
Effective Income Tax Rate Reconciliation, Share-based Award Payments, Amount	(3,928)	(6,613)	0
Other	(1,662)	(1,385)	(1,788)
Total income tax expense	$ 105,949	$ 110,506	$ 124,151

Income Taxes (Schedule Of Accru

Income Taxes (Schedule Of Accrued Liability For Unrecognized Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,208	$ 1,228
Gross increases – tax positions in prior period	31	5
Gross increases – current-period tax positions	322	268
Lapse of statute of limitations	(304)	(293)
Unrecognized tax benefits at end of year	$ 1,257	$ 1,208

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, discretionary contribution by employer	$ 0	$ 5,500,000
Minimum required contribution for 2019	0
Contributions to the CERP	24,000	439,000	$ 21,000
Accumulated benefit obligation	112,100,000	120,700,000
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	2,100,000
Interest cost on projected benefit obligation	$ 3,756,000	$ 3,826,000	$ 3,944,000
Expected long-term rate of return on pension plan assets	5.00%	6.00%	6.00%
Annualized 10-year return for pension plan	7.20%
Rate of return	(1.70%)	9.60%
Pension expense	$ 1,100,000
Expected pension expense for the upcoming fiscal year	$ 2,200,000
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	$ (300,000)
Change in Accounting Estimate, Type [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost on projected benefit obligation		$ (900,000)

Employee Benefit Plans (Employe

Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total employee benefits	$ 71,297	$ 67,376	$ 66,470
Payroll Taxes [Member]
Total employee benefits	25,712	24,402	23,210
Medical Plans [Member]
Total employee benefits	27,030	25,143	25,497
401K Plan [Member]
Total employee benefits	14,986	14,244	13,562
Other [Member]
Total employee benefits	2,918	2,883	3,214
Pension Plans [Member]
Total employee benefits	$ 651	$ 704	$ 987

Employee Benefit Plans (Compone

Employee Benefit Plans (Components Of The Net Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan [Abstract]
Service cost-benefits earned during the year	$ 651	$ 621	$ 500
Interest cost on projected benefit obligation	3,756	3,826	3,944
Expected return on plan assets	(5,255)	(5,785)	(5,751)
Amortization of prior service cost	(271)	(271)	(271)
Amortization of unrecognized net loss	2,267	2,313	2,565
Net periodic pension cost	$ 1,148	$ 704	$ 987

Employee Benefit Plans (Summary

Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at prior valuation date	$ 120,667	$ 116,695
Service cost	651	621	$ 500
Interest cost	3,756	3,826	3,944
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(6,622)	(6,780)
Actuarial (gain) loss	(6,389)	6,305
Projected benefit obligation at valuation date	112,063	120,667	116,695
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior valuation date	108,260	99,537
Actual return on plan assets	(2,244)	9,564
Employer contributions	24	5,939
Benefits paid	(6,622)	(6,780)
Fair value of plan assets at valuation date	99,418	108,260	$ 99,537
Funded status and net amount recognized at valuation date	$ (12,645)	$ (12,407)

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan [Abstract]
Prior service (credit) cost	$ 1,535	$ 1,806
Accumulated loss	(32,342)	(33,499)
Accumulated other comprehensive loss	(30,807)	(31,693)
Cumulative employer contributions in excess of net periodic benefit cost	18,162	19,286
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	(12,645)	(12,407)
Net loss arising during period	(1,110)	(2,527)
Amortization of net loss	2,267	2,313	$ 2,565
Amortization of prior service cost	(271)	(271)	$ (271)
Total recognized in other comprehensive income	886	(485)
Total expense recognized in net periodic pension cost and other comprehensive income	$ (262)	$ (1,189)

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions On A Weighted Average Basis, Used In Accounting For Plans) (Details)	12 Months Ended
	Dec. 31, 2018Rate	Dec. 31, 2017Rate	Dec. 31, 2016Rate
Defined Benefit Plan [Abstract]
Determination of benefit obligation at year end, Discount rate	4.14%	3.57%	4.05%
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	3.57%	3.95%	4.16%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Effective Rate of Interest	3.28%	3.28%	3.38%
Determination of net periodic benefit cost for year ended, Long-term rate of return on assets	5.00%	6.00%	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, 2018	Dec. 31, 2017
U.S. government obligations		$ 907,652	$ 917,147
Government-sponsored enterprise obligations		195,778	406,363
State and municipal obligations		1,328,039	1,611,366
Agency mortgage-backed securities		3,214,985	3,040,913
Non-agency mortgage-backed securities		1,047,716	905,793
Asset-backed securities		1,511,614	1,492,800
Pension Plans [Member]
U.S. government obligations		2,994	3,719
Government-sponsored enterprise obligations	[1]	1,200	1,282
State and municipal obligations		8,299	8,527
Agency mortgage-backed securities	[2]	8,209	7,896
Non-agency mortgage-backed securities		4,398	4,891
Asset-backed securities		3,520	3,833
Corporate bonds	[3]	37,207	37,457
Mutual funds	[4]	8,645	6,979
Common stocks	[4]	18,173	23,744
International developed markets	[4]	5,046	7,870
Emerging markets	[4]	1,727	2,062
Total		99,418	108,260
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
U.S. government obligations		907,652	917,147
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		2,994	3,719
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]	8,645	6,979
Common stocks	[4]	18,173	23,744
International developed markets	[4]	5,046	7,870
Emerging markets	[4]	1,727	2,062
Total		36,585	44,374
Significant Other Observable Inputs (Level 2) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		195,778	406,363
State and municipal obligations		1,313,881	1,594,350
Agency mortgage-backed securities		3,214,985	3,040,913
Non-agency mortgage-backed securities		1,047,716	905,793
Asset-backed securities		1,511,614	1,492,800
Significant Other Observable Inputs (Level 2) [Member] | Pension Plans [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations	[1]	1,200	1,282
State and municipal obligations		8,299	8,527
Agency mortgage-backed securities	[2]	8,209	7,896
Non-agency mortgage-backed securities		4,398	4,891
Asset-backed securities		3,520	3,833
Corporate bonds	[3]	37,207	37,457
Mutual funds	[4]	0	0
Common stocks	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Total		62,833	63,886
Significant Unobservable Inputs (Level 3) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		0	0
State and municipal obligations		14,158	17,016
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 consumer goods industries.

Employee Benefit Plans (Future

Employee Benefit Plans (Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Defined Benefit Plan [Abstract]
2,019	$ 7,163
2,020	7,353
2,021	7,510
2,022	7,473
2,023	7,509
2024 - 2028	$ 36,468

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for issuance under the plan	2,515,678
Stock-based compensation	$ 12.8	$ 12.1	$ 11.5
Total tax benefit recognized from compensation arrangements	3.2	4.5	4.3
Fair value of shares vested during the period	21.5	$ 23.8	$ 10.9
Unrecognized compensation cost related to unvested options, SAR's and stock awards	$ 27.3
Compensation cost is expected to be recognized over a weighted average period, years	3 years 2 months
Common stock dividend rate percentage	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	53,160
Number of shares purchased under stock option plan	31,235	16,666
Average price of shares purchased under stock option plan	$ 57.69	$ 51.95

Stock-Based Compensation and _4

Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of The Status Of Nonvested Share Awards) (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Nonvested Share Awards [Roll Forward]
Nonvested, share awards, beginning balance | shares	1,317,092
Granted, Shares | shares	268,658
Vested, Shares | shares	(376,489)
Forfeited, Shares | shares	(28,321)
Canceled, Shares | shares	0
Nonvested, share awards, ending balance | shares	1,180,940
Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 36.82
Granted, Weighted Average Grant Date Fair Value | $ / shares	57.28
Vested, Weighted Average Grant Date Fair Value | $ / shares	30.73
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	44.12
Canceled, Weighted Average Grant Date Fair Value | $ / shares	0
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 43.24

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, 2018USD ($)$ / sharesshares
Stock Appreciation Rights, Shares [Roll Forward]
Outstanding, Shares, Beginning Balance | shares	1,237,804
Granted, Shares | shares	177,001
Forfeited, Shares | shares	(17,529)
Expired, Shares | shares	(607)
Exercised, Shares | shares	(330,231)
Outstanding, Shares, Ending Balance | shares	1,066,438
Exercisable, Shares, Ending Balance | shares	561,527
Stock Appreciation Rights, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 35.36
Granted, Weighted Average Exercise Price | $ / shares	55.63
Forfeited, Weighted Average Exercise Price | $ / shares	45.82
Expired, Weighted Average Exercise Price | $ / shares	43.14
Exercised, Weighted Average Exercise Price | $ / shares	29.96
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	40.22
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 34.57
Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 8 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $	$ 17,218
Exercisable, Weighted Average Remaining Contractual Term (in years)	5 years 7 months
Exercisable, Aggregate Intrinsic Value, Ending Balance | $	$ 12,239

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, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 11.84	$ 11.37	$ 6.47
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.60%	1.60%	2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	20.60%	21.10%	21.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.70%	2.40%	1.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 7 months	7 years	7 years 2 months

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation [Abstract]
Intrinsic value of options and SARs exercised	$ 9,632	$ 9,310	$ 8,854
Tax benefit realized from options and SARs exercised	$ 1,928	$ 2,698	$ 1,781

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ (64,669,000)		$ 14,108,000		$ 10,975,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(66,892,000)		34,059,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2,377,000		(29,006,000)
Other Comprehensive Income (Loss), before Tax	(64,515,000)		5,053,000
Other Comprehensive Income (Loss), Tax	16,126,000		(1,920,000)
Other comprehensive income (loss)	(48,389,000)		3,133,000		(21,495,000)
Reclassification Where Impairment Was Not Previously Recognized	0		0
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	(23,107,000)	[1]	(19,629,000)	[1]	(19,328,000)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(1,110,000)		(2,527,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,996,000		2,042,000
Other Comprehensive Income (Loss), before Tax	886,000		(485,000)
Other Comprehensive Income (Loss), Tax	(222,000)		184,000
Other comprehensive income (loss)	664,000		(301,000)
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	6,855,000		0		0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	8,381,000		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	760,000		0
Other Comprehensive Income (Loss), before Tax	9,141,000		0
Other Comprehensive Income (Loss), Tax	(2,286,000)		0
Other comprehensive income (loss)	6,855,000		0
Reclassification Where Impairment Was Not Previously Recognized	0		0
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	(52,278,000)	[2]	30,326,000	[2]	27,328,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(73,725,000)		36,307,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(447,000)		(31,433,000)
Other Comprehensive Income (Loss), before Tax	(74,172,000)		4,874,000
Other Comprehensive Income (Loss), Tax	18,541,000		(1,852,000)
Other comprehensive income (loss)	(55,631,000)		3,022,000
Reclassification Where Impairment Was Not Previously Recognized	(12,000)		(24,000)
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	3,861,000	[2]	3,411,000	[2]	$ 2,975,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(438,000)		279,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	68,000		385,000
Other Comprehensive Income (Loss), before Tax	(370,000)		664,000
Other Comprehensive Income (Loss), Tax	93,000		(252,000)
Other comprehensive income (loss)	(277,000)		412,000
Reclassification Where Impairment Was Not Previously Recognized	12,000		$ 24,000
Accounting Standards Update 2018-02 Member [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	2,932,000
Accounting Standards Update 2018-02 Member [Member] | Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(4,142,000)
Accounting Standards Update 2018-02 Member [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	0
Accounting Standards Update 2018-02 Member [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	6,359,000
Accounting Standards Update 2018-02 Member [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	715,000
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	(33,320,000)
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	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	(33,320,000)
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
[1]	(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.As mentioned in Note 1, new accounting guidance for investment securities, 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).
[2]	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.

Segments (Schedule Of Financial

Segments (Schedule Of Financial Information By Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Operating_Segments	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Operating_Segments	3
Net interest income	$ 823,825	$ 733,679	$ 680,049
Provision for loan losses	(42,694)	(45,244)	(36,318)
Non-interest income	501,341	461,263	446,556
Investment securities gains (losses), net	(488)	25,051	(53)
Non-interest expense	(737,821)	(744,343)	(689,229)
Income before income taxes	544,163	430,406	401,005
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	296,228	279,031	268,654
Provision for loan losses	(41,280)	(41,829)	(36,042)
Non-interest income	126,253	121,362	116,185
Investment securities gains (losses), net	0	0	0
Non-interest expense	(287,473)	(275,734)	(266,258)
Income before income taxes	93,728	82,830	82,539
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	345,221	329,087	311,704
Provision for loan losses	(1,134)	205	4,378
Non-interest income	202,527	184,577	187,350
Investment securities gains (losses), net	0	0	0
Non-interest expense	(297,847)	(281,845)	(272,398)
Income before income taxes	248,767	232,024	231,034
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	46,946	47,264	44,113
Provision for loan losses	32	(41)	(122)
Non-interest income	173,026	158,175	144,661
Investment securities gains (losses), net	0	0	0
Non-interest expense	(123,576)	(120,461)	(113,888)
Income before income taxes	96,428	84,937	74,764
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	688,395	655,382	624,471
Provision for loan losses	(42,382)	(41,665)	(31,786)
Non-interest income	501,806	464,114	448,196
Investment securities gains (losses), net	0	0	0
Non-interest expense	(708,896)	(678,040)	(652,544)
Income before income taxes	438,923	399,791	388,337
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	135,430	78,297	55,578
Provision for loan losses	(312)	(3,579)	(4,532)
Non-interest income	(465)	(2,851)	(1,640)
Investment securities gains (losses), net	(488)	25,051	(53)
Non-interest expense	(28,925)	(66,303)	(36,685)
Income before income taxes	$ 105,240	$ 30,615	$ 12,668

Segments Segments (Segment Bala

Segments Segments (Segment Balance Sheet Data) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Average Assets	$ 24,666,235	$ 25,031,608
Average Loans, including held for sale	13,945,572	13,629,151
Average Goodwill and other intangible assets	147,108	146,018
Average Deposits	20,131,252	20,594,786
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	2,541,627	2,610,045
Average Loans, including held for sale	2,401,657	2,471,578
Average Goodwill and other intangible assets	78,062	76,734
Average Deposits	10,210,506	10,190,613
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	9,115,738	8,830,584
Average Loans, including held for sale	8,939,696	8,635,035
Average Goodwill and other intangible assets	68,300	68,538
Average Deposits	8,029,248	8,301,004
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	1,243,806	1,218,598
Average Loans, including held for sale	1,233,780	1,209,792
Average Goodwill and other intangible assets	746	746
Average Deposits	1,871,596	2,090,582
Segment Totals [Member]
Segment Reporting Information [Line Items]
Average Assets	12,901,171	12,659,227
Average Loans, including held for sale	12,575,133	12,316,405
Average Goodwill and other intangible assets	147,108	146,018
Average Deposits	20,111,350	20,582,199
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Average Assets	11,765,064	12,372,381
Average Loans, including held for sale	1,370,439	1,312,746
Average Goodwill and other intangible assets	0	0
Average Deposits	$ 19,902	$ 12,587

Common and Preferred Stock (Nar

Common and Preferred Stock (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock dividend rate percentage	5.00%
Common stock, par value	$ 5	$ 5
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	223,000	159,000	88,000
Shares available for purchase under the current Board authorization			5,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	2,249,563

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 433,542	$ 319,383	$ 275,391
Preferred Stock Dividends, Income Statement Impact	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 424,542	$ 310,383	$ 266,391
Basic income per common share (in dollars per share)	$ 3.79	$ 2.77	$ 2.38
Diluted income per common share (in dollars per share)	$ 3.78	$ 2.76	$ 2.37
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.	$ 433,542	$ 319,383	$ 275,391
Preferred Stock Dividends, Income Statement Impact	9,000	9,000	9,000
Net Income (Loss) Available to Common Stockholders, Basic	424,542	310,383	266,391
Less income allocated to nonvested restricted stockholders	4,558	3,848	3,698
Net income available to common stockholders	$ 419,984	$ 306,535	$ 262,693
Weighted average common shares outstanding	110,812	110,833	110,505
Basic income per common share (in dollars per share)	$ 3.79	$ 2.77	$ 2.38
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	$ 424,542	$ 310,383	$ 266,391
Less income allocated to nonvested restricted stockholders	4,547	3,838	3,692
Net income available to common stockholders	$ 419,995	$ 306,545	$ 262,699
Weighted average common shares outstanding	110,812	110,833	110,505
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	343	391	295
Weighted average diluted common shares outstanding	111,155	111,224	110,800
Diluted income per common share (in dollars per share)	$ 3.78	$ 2.76	$ 2.37

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Common Stock [Roll Forward]
Shares outstanding, beginning balance	106,615	101,461	97,226
Awards and sales under employee and director plans	416	403	397
5% stock dividend	5,305	5,078	4,831
Other purchases of treasury stock	(1,194)	(315)	(959)
Other	(13)	(12)	(34)
Shares outstanding, ending balance	111,129	106,615	101,461

Common and Preferred Stock Pref

Common and Preferred Stock Preferred Stock Issuance (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2018	Dec. 31, 2017	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, 2018	Dec. 31, 2017
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	$ 3,022,023	$ 2,747,863
Total Capital (to risk-weighted assets), Actual Ratio	15.82%	14.35%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,528,317	$ 1,531,996
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%	8.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,861,016	$ 2,567,264
Tier I Capital (to risk-weighted assets), Actual Ratio	14.98%	13.41%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,146,238	$ 1,148,997
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	$ 2,716,232	$ 2,422,480
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	14.22%	12.65%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 859,678	$ 861,748
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	$ 2,861,016	$ 2,567,264
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	11.52%	10.39%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 993,564	$ 988,653
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	$ 2,655,591	$ 2,428,789
Total Capital (to risk-weighted assets), Actual Ratio	13.98%	12.76%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,519,169	$ 1,522,361
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	$ 1,898,962	$ 1,902,951
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%	10.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,494,584	$ 2,268,131
Tier I Capital (to risk-weighted assets), Actual Ratio	13.14%	11.92%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,139,377	$ 1,141,771
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	$ 1,519,169	$ 1,522,361
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	$ 2,494,584	$ 2,268,131
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	13.14%	11.92%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 854,533	$ 856,328
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	$ 1,234,325	$ 1,236,918
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	$ 2,494,584	$ 2,268,131
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	10.07%	9.20%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 991,185	$ 986,240
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	$ 1,238,981	$ 1,232,800
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, 2018Rate
Revenue from Contract with Customer [Abstract]
Percent of Revenue not in scope of ASC 606	62.00%

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 171,576	$ 155,100	$ 154,043
Non-interest income	501,341	461,263	446,556
Data processing and software	85,978	80,998	79,589
Other	64,304	63,366	59,499
Noninterest Expense	$ 737,821	744,343	689,229
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		180,441	181,879
Non-interest income		486,604	474,392
Data processing and software		92,246	92,722
Other		77,459	74,202
Noninterest Expense		769,684	717,065
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)	(27,836)
Non-interest income		(25,341)	(27,836)
Data processing and software		(11,248)	(13,133)
Other		(14,093)	(14,703)
Noninterest Expense		(25,341)	(27,836)
Initial Application Period Cumulative Effect Transition [Domain]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		155,100	154,043
Non-interest income		461,263	446,556
Data processing and software		80,998	79,589
Other		63,366	59,499
Noninterest Expense		$ 744,343	$ 689,229

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Non-interest income	$ 501,341	$ 461,263	$ 446,556
Revenue from Contracts with Customers In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	467,304	425,077	407,342
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Bank Card Transaction Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	171,576	155,100	154,043
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Trust Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	147,964	135,159	121,795
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	94,517	90,060	86,394
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Consumer Brokerage Services [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	15,807	14,630	13,784
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Other Non-Interest Income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	37,440	30,128	31,326
Revenue Not In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	$ 34,037	$ 36,186	$ 39,214

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Bank Card Transaction Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 13,035	$ 13,315	$ 14,686
Trust Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	2,721	2,802	2,681
Deposit Account Charges and Other Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	6,107	5,597	5,735
Consumer Brokerage Services [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 559	$ 380	$ 309

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 171,576	$ 155,100	$ 154,043
Debit Card [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	39,738	35,636	33,441
Debit Card [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	41,522	40,134	39,430
Debit Card [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(1,784)	(4,498)	(5,989)
Credit Card [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	12,965	14,576	14,834
Credit Card [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	26,799	25,275	24,650
Credit Card [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(13,834)	(10,699)	(9,816)
Corporate Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	99,640	84,819	82,725
Corporate Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	199,651	179,642	166,576
Corporate Card Fees [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(100,011)	(94,823)	(83,851)
Merchant Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	19,233	20,069	23,043
Merchant Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	30,241	31,863	37,407
Merchant Fees [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(3,177)	(3,566)	(4,779)
Merchant Fees [Member] | Fees to Cardholder Banks [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ (7,831)	$ (8,228)	$ (9,585)

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Trust Fees [Line Items]
Fees and Commissions, Fiduciary and Trust Activities (Deprecated 2018-01-31)	$ 147,964	$ 135,159	$ 121,795
Private Client [Member]
Trust Fees [Line Items]
Fees and Commissions, Fiduciary and Trust Activities (Deprecated 2018-01-31)	111,533	100,358	90,992
Institutional [Member]
Trust Fees [Line Items]
Fees and Commissions, Fiduciary and Trust Activities (Deprecated 2018-01-31)	29,241	27,477	24,565
Other Trust Fees [Member]
Trust Fees [Line Items]
Fees and Commissions, Fiduciary and Trust Activities (Deprecated 2018-01-31)	$ 7,190	$ 7,324	$ 6,238

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	$ 94,517	$ 90,060	$ 86,394
Corporate Cash Management [Member]
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	38,468	36,044	36,131
Overdraft and Return Item [Member]
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	31,468	30,576	29,350
Other Deposit Account Charges [Member]
Deposit Account Charges and Other Fees [Line Items]
Fees and Commissions, Depositor Accounts (Deprecated 2018-01-31)	$ 24,581	$ 23,440	$ 20,913

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Consumer Brokerage Services [Line Items]
Brokerage Commissions Revenue	$ 15,807	$ 14,630	$ 13,784
Commission Income [Member]
Consumer Brokerage Services [Line Items]
Brokerage Commissions Revenue	8,956	8,400	8,170
Managed Account Services [Member]
Consumer Brokerage Services [Line Items]
Brokerage Commissions Revenue	$ 6,851	$ 6,230	$ 5,614

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments, included in non-marketable securities	$ 85,659	$ 55,752
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	14,200
Private equity investments, included in non-marketable securities	$ 85,659	$ 55,752

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 13,529	$ 15,327
U.S. government and federal agency obligations	907,652	917,147
Government-sponsored enterprise obligations	195,778	406,363
State and municipal obligations	1,328,039	1,611,366
Agency mortgage-backed securities	3,214,985	3,040,913
Non-agency mortgage-backed securities	1,047,716	905,793
Asset-backed securities	1,511,614	1,492,800
Other debt securities	332,257	351,060
Trading securities	27,059	18,269
Equity Securities, FV-NI	2,585	48,838
Private equity investments	85,659	55,752
Derivative Assets	41,210	8,349
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	8,721,051	8,884,820
Derivative Liability	13,421	8,074
Deferred Compensation Liability, Current and Noncurrent	12,968	12,843
Total liabilities	26,389	20,917
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	907,652	917,147
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, FV-NI	2,585	19,864
Private equity investments	0	0
Derivative Assets	0	0
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	923,205	949,854
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	12,968	12,843
Total liabilities	12,968	12,843
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	13,529	15,327
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	195,778	406,363
State and municipal obligations	1,313,881	1,594,350
Agency mortgage-backed securities	3,214,985	3,040,913
Non-agency mortgage-backed securities	1,047,716	905,793
Asset-backed securities	1,511,614	1,492,800
Other debt securities	332,257	351,060
Trading securities	27,059	18,269
Equity Securities, FV-NI	0	28,974
Private equity investments	0	0
Derivative Assets	40,627	7,723
Deferred Compensation Plan Assets	0	0
Total Assets	7,697,446	7,861,572
Derivative Liability	13,328	7,951
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	13,328	7,951
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	14,158	17,016
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, FV-NI	0	0
Private equity investments	85,659	55,752
Derivative Assets	583	626
Deferred Compensation Plan Assets	0	0
Total Assets	100,400	73,394
Derivative Liability	93	123
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	$ 93	$ 123

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, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 73,271	$ 67,760
Total gains or losses (realized/unrealized) included in earnings	13,954	(5,567)
Total gains losses (realized/unrealized) included in other comprehensive income	(274)	882
Investment securities called	(2,616)	(600)
Discount accretion	32	52
Purchases of private equity securities	16,395	13,352
Sale / paydown of private equity securities	(371)	(2,621)
Capitalized interest/dividends	34	34
Purchase of risk participation agreement	61	70
Sale of risk participation agreement	(179)	(91)
Ending balance	100,307	73,271
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	14,512	(5,043)
State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	17,016	16,682
Total gains or losses (realized/unrealized) included in earnings	0	0
Total gains losses (realized/unrealized) included in other comprehensive income	(274)	882
Investment securities called	(2,616)	(600)
Discount accretion	32	52
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	14,158	17,016
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	55,752	50,820
Total gains or losses (realized/unrealized) included in earnings	13,849	(5,833)
Total gains losses (realized/unrealized) included in other comprehensive income	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchases of private equity securities	16,395	13,352
Sale / paydown of private equity securities	(371)	(2,621)
Capitalized interest/dividends	34	34
Purchase of risk participation agreement	0	0
Sale of risk participation agreement	0	0
Ending balance	85,659	55,752
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	13,849	(5,658)
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	503	258
Total gains or losses (realized/unrealized) included in earnings	105	266
Total gains losses (realized/unrealized) included in other comprehensive income	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	61	70
Sale of risk participation agreement	(179)	(91)
Ending balance	490	503
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	$ 663	$ 615

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, 2018	Dec. 31, 2017
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	$ 13,954	$ (5,567)
Change in unrealized gains or losses relating to assets still held at period end	14,512	(5,043)
Loans Fees And Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	(45)	231
Change in unrealized gains or losses relating to assets still held at period end	535	580
Other Non-Interest Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	150	35
Change in unrealized gains or losses relating to assets still held at period end	128	35
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	13,849	(5,833)
Change in unrealized gains or losses relating to assets still held at period end	$ 13,849	$ (5,658)

Fair Value Measurements (Summ_4

Fair Value Measurements (Summary of Quantitative Information About Level 3 Fair Value Measurements) (Details)	12 Months Ended
	Dec. 31, 2018
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
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	4 years
Fair Value, Estimated Market Rate, Percent	4.30%
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	53.70%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	0.70%
Maximum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Recovery Period, Years	5 years
Fair Value, Estimated Market Rate, Percent	4.80%
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	98.00%
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	78.60%
Weighted Average, Embedded Servicing Value	1.30%

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, 2018	Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, fair value	$ 294	$ 1,236
Collateral dependent impaired loans, Total Gains (Losses)	(269)	(617)
Mortgage servicing rights, fair value	6,478	4,653
Mortgage servicing rights, Total Gains (Losses)	9	13
Foreclosed assets, fair value	0	0
Foreclosed assets, Total Gains (Losses)	0	(9)
Long Lived Assets Nonrecurring Basis, fair value	914	3,378
Long Lived Assets Nonrecurring Basis Gains (Losses)	(552)	(724)
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
Foreclosed assets, 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
Foreclosed assets, 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	294	1,236
Mortgage servicing rights, fair value	6,478	4,653
Foreclosed assets, fair value	0	0
Long Lived Assets Nonrecurring Basis, fair value	$ 914	$ 3,378

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, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 13,529
Securities Purchased under Agreements to Resell	700,000	$ 700,000
Interest-bearing Deposits in Banks and Other Financial Institutions	689,876	30,631
Cash and due from banks	507,892	438,439
Derivative Assets	41,210	8,349
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	8,721,051	8,884,820
Non-interest bearing deposits	6,980,298	7,158,962
Savings, interest checking and money market deposits	11,685,239	11,499,620
Time open and certificates of deposit	1,658,122
Other borrowings	8,702	1,758
Derivative Liability	13,421	8,074
Deferred Compensation Liability, Current and Noncurrent	12,968	12,843
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	0	0
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	923,205	949,854
Derivative Liability	0	0
Deferred Compensation Liability, Current and Noncurrent	12,968	12,843
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	40,627	7,723
Deferred Compensation Plan Assets	0	0
Total Assets	7,697,446	7,861,572
Derivative Liability	13,328	7,951
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	583	626
Deferred Compensation Plan Assets	0	0
Total Assets	100,400	73,394
Derivative Liability	93	123
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	14,140,298	13,983,674
Loans Held-for-sale, Fair Value Disclosure	20,694	21,398
Investments, Fair Value Disclosure	8,698,666	8,893,307
Federal funds sold	3,320	42,775
Securities Purchased under Agreements to Resell	700,000	700,000
Interest-bearing Deposits in Banks and Other Financial Institutions	689,876	30,631
Cash and due from banks	507,892	438,439
Derivative Assets	41,210	8,349
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	24,814,924	24,131,416
Non-interest bearing deposits	6,980,298	7,158,962
Savings, interest checking and money market deposits	11,685,239	11,499,620
Time open and certificates of deposit	1,658,122	1,766,864
Federal Funds Purchased, Fair Value Disclosure	13,170	202,370
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	1,943,219	1,304,768
Other borrowings	8,702	1,758
Derivative Liability	13,421	8,074
Deferred Compensation Liability, Current and Noncurrent	12,968	12,843
Financial Liabilities Fair Value Disclosure	22,315,139	21,955,259
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,106,427	4,958,554
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	869,659	968,820
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,875,788	2,697,452
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,127,083	2,062,787
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,955,572	2,104,487
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	376,399	400,587
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	814,134	783,864
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	15,236	7,123
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,866,003	13,993,509
Loans Held-for-sale, Fair Value Disclosure	20,694	21,398
Investments, Fair Value Disclosure	8,698,666	8,893,307
Federal funds sold	3,320	42,775
Securities Purchased under Agreements to Resell	693,228	695,194
Interest-bearing Deposits in Banks and Other Financial Institutions	689,876	30,631
Cash and due from banks	507,892	438,439
Derivative Assets	41,210	8,349
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	24,533,857	24,136,445
Non-interest bearing deposits	6,980,298	7,158,962
Savings, interest checking and money market deposits	11,685,239	11,499,620
Time open and certificates of deposit	1,663,748	1,768,780
Federal Funds Purchased, Fair Value Disclosure	13,170	202,370
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	1,944,458	1,305,375
Other borrowings	8,702	1,758
Derivative Liability	13,421	8,074
Deferred Compensation Liability, Current and Noncurrent	12,968	12,843
Financial Liabilities Fair Value Disclosure	22,322,004	21,957,782
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,017,694	4,971,401
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	868,274	979,389
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,846,095	2,702,598
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,084,370	2,060,443
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,916,627	2,074,129
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	365,069	400,333
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	756,651	798,093
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	11,223	7,123
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	910,237	937,011
Federal funds sold	3,320	42,775
Securities Purchased under Agreements to Resell	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	689,876	30,631
Cash and due from banks	507,892	438,439
Derivative Assets	0	0
Deferred Compensation Plan Assets	12,968	12,843
Total Assets	2,124,293	1,461,699
Non-interest bearing deposits	6,980,298	7,158,962
Savings, interest checking and money market deposits	11,685,239	11,499,620
Time open and certificates of deposit	0	0
Federal Funds Purchased, Fair Value Disclosure	13,170	202,370
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	12,968	12,843
Financial Liabilities Fair Value Disclosure	18,691,675	18,873,795
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	20,694	21,398
Investments, Fair Value Disclosure	7,643,290	7,838,522
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	40,627	7,723
Deferred Compensation Plan Assets	0	0
Total Assets	7,704,611	7,867,643
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Time open and 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	0	0
Derivative Liability	13,328	7,951
Deferred Compensation Liability, Current and Noncurrent	0	0
Financial Liabilities Fair Value Disclosure	13,328	7,951
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	13,866,003	13,993,509
Loans Held-for-sale, Fair Value Disclosure	0	0
Investments, Fair Value Disclosure	145,139	117,774
Federal funds sold	0	0
Securities Purchased under Agreements to Resell	693,228	695,194
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Cash and due from banks	0	0
Derivative Assets	583	626
Deferred Compensation Plan Assets	0	0
Total Assets	14,704,953	14,807,103
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Time open and certificates of deposit	1,663,748	1,768,780
Federal Funds Purchased, Fair Value Disclosure	0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	1,944,458	1,305,375
Other borrowings	8,702	1,758
Derivative Liability	93	123
Deferred Compensation Liability, Current and Noncurrent	0	0
Financial Liabilities Fair Value Disclosure	3,617,001	3,076,036
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	5,017,694	4,971,401
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	868,274	979,389
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	2,846,095	2,702,598
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	2,084,370	2,060,443
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	1,916,627	2,074,129
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	365,069	400,333
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	756,651	798,093
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	$ 11,223	$ 7,123

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Notional Amount	$ 3,254,921	$ 1,963,178
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,000,000	0
Premium paid for interest rate floor cash flow hedge	20,700
Net unrealized gain (loss) on interest rate floors	9,100
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	(2,800)
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,006,280	1,741,412
Variation Margin Impact to Positive Fair Values of Cleared Swaps	(8,100)	(4,500)
Variation Margin Impact to Negative Fair Values of Cleared Swaps	$ (6,500)	$ (4,300)

Derivative Instruments (Schedul

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Notional Amount	$ 3,254,921	$ 1,963,178
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,006,280	1,741,412
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,000,000	0
Interest Rate Caps [Member]
Derivative [Line Items]
Derivative, Notional Amount	62,163	31,776
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Derivative, Notional Amount	143,460	133,488
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,206	11,826
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	14,544	17,110
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	5,768	2,566
Forward TBA Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 16,500	$ 25,000

Derivative Instruments (Sched_2

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 41,210	$ 8,349
Other liabilities	(13,421)	(8,074)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	29,031	0
Other liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Derivatives, Fair Value [Line Items]
Other assets	29,031	0
Other liabilities	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	12,179	8,349
Other liabilities	(13,421)	(8,074)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	11,537	7,674
Other liabilities	(13,110)	(7,857)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	24	16
Other liabilities	(24)	(16)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	47	46
Other liabilities	(93)	(123)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	20	21
Other liabilities	(8)	(40)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	536	580
Other liabilities	0	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	15	8
Other liabilities	(8)	(7)
Not Designated as Hedging Instrument [Member] | Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	4
Other liabilities	$ (178)	$ (31)

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Summary of Cash Flow Hedge Activity) (Details) - Designated as Hedging Instrument [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Summary of Cash Flow Hedge Activity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 8,381
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(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	8,381
Interest and Fee Income on Loans [Member] | Interest Rate Floor [Member]
Summary of Cash Flow Hedge Activity [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ (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, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 4,480	$ 1,580	$ 6,041
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	3,914	1,978	5,927
Other Non-Interest Income [Member] | Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	11	0	0
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	150	35	(44)
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	31	(80)	55
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(45)	231	87
Loans Fees And Sales [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	5	64	(63)
Loans Fees And Sales [Member] | Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 414	$ (648)	$ 79

Derivative Instruments Deriva_2

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Derivative Assets	$ 41,210	$ 8,349
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	41,210	8,349
Derivative Liability	13,421	8,074
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	13,421	8,074
Derivative Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	40,613	7,726
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Noncurrent	40,613	7,726
Derivative Asset, Not Offset, Policy Election Deduction	(2,992)	(233)
Derivative Asset, Fair Value of Collateral	(26,174)	(824)
Derivative Asset, Fair Value, Amount Offset Against Collateral	11,447	6,669
Derivative Liability, Fair Value, Gross Liability	13,333	7,935
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Noncurrent	13,333	7,935
Derivative Liability, Not Offset, Policy Election Deduction	(2,992)	(233)
Derivative Liability, Fair Value of Collateral	(261)	(1,570)
Derivative Liability, Fair Value, Amount Offset Against Collateral	10,080	6,132
Derivative Not Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	597	623
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	597	623
Derivative Liability, Fair Value, Gross Liability	88	139
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 88	$ 139

Resale and Repurchase Agreeme_3

Resale and Repurchase Agreements (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Collateral swap agreements	$ 450	$ 650
Collateral Already Posted, Aggregate Fair Value	463.3
Collateral Accepted, Aggregate Fair Value	$ 453.7

Resale and Repurchase Agreeme_4

Resale and Repurchase Agreements Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	$ 1,150,000	$ 1,350,000
Securities Purchased under Agreements to Resell, Liability	(450,000)	(650,000)
Securities purchased under agreements to resell, net	700,000	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	(700,000)	(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	2,393,219	1,954,768
Securities Sold under Agreements to Repurchase, Asset	(450,000)	(650,000)
Securities sold under agreements to repurchase, net	1,943,219	1,304,768
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	(1,943,219)	(1,304,768)
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, 2018	Dec. 31, 2017
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	$ 387,541	$ 271,820
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	18,466	149,111
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	882,744	737,975
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	187,740	0
Maturity Overnight [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	322,680	89,601
Maturity Overnight [Member] | Other Debt Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	98,522	14,780
Maturity Overnight [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,897,693	1,263,287
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	150,000	1,731
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	31,774	9,750
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	0	30,000
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	181,774	41,481
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	100,000	450,000
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	213,752	200,000
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	313,752	650,000
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	637,541	723,551
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	18,466	149,111
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	1,128,270	947,725
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	187,740	0
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	322,680	119,601
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	98,522	14,780
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	$ 2,393,219	$ 1,954,768

Commitments, Contingencies An_3

Commitments, Contingencies And Guarantees (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating leases, rent expense	$ 7,700	$ 7,300	$ 7,100
Outstanding purchase commitments expected to fund in the next 12 months	180,500
Notional amount of underlying swaps	3,254,921	1,963,178
Financial Standby Letter of Credit [Member]
Carrying value of the guarantee obligations, liability	2,700
Commitments outstanding	353,905	$ 387,811
State Tax Credits [Member]
Purchases of state tax credits	80,900
Sales of state tax credits	71,600
Risk Participation Agreement [Member]
Carrying value of the guarantee obligations, liability	93
Notional amount of underlying swaps	$ 87,400
Risk Participation Agreement [Member] | Minimum [Member]
Risk Participation Agreements, Term	2 years
Risk Participation Agreement [Member] | Maximum [Member]
Risk Participation Agreements, Term	11 years

Commitments, Contingencies An_4

Commitments, Contingencies And Guarantees (Summary Of Minimum Lease Commitments) (Details) $ in Thousands	Dec. 31, 2018USD ($)
2,019	$ 5,763
2,020	4,817
2,021	4,055
2,022	3,598
2,023	3,273
After	15,161
Total minimum lease payments	36,667
Real Property [Member]
2,019	5,659
2,020	4,766
2,021	4,027
2,022	3,598
2,023	3,273
After	15,161
Equipment [Member]
2,019	104
2,020	51
2,021	28
2,022	0
2,023	0
After	$ 0

Commitments, Contingencies An_5

Commitments, Contingencies And Guarantees (Schedule Of Off-Balance Sheet Instruments Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commercial letters of credit	$ 13,774	$ 4,498
Credit Card [Member]
Commitments to extend credit	5,328,502	5,102,556
Other [Member]
Commitments to extend credit	5,840,967	5,737,181
Financial Standby Letter of Credit [Member]
Standby letters of credit, net of participations	$ 353,905	$ 387,811

Related Parties (Narrative) (De

Related Parties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018USD ($)$ / Square_FootRateshares	Dec. 31, 2017USD ($)$ / Square_Foot	Dec. 31, 2016USD ($)$ / Square_Foot
Tower Property [Member]
Percentage of Tower stock owned by the Company's Executive Officers | Rate	67.00%
Company stock owned by Tower | shares	201,901
Tower's long-term line of credit with the Bank	$ 13,500,000
Debt Instrument, Unused Borrowing Capacity, Fee	9,100,000
Tower's maximum amount outstanding on the line of credit during period	0	$ 5,200,000	$ 0
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	$ 74,000	$ 74,000	$ 72,000
Rent per square foot | $ / Square_Foot	16.69	15.75	15.67
Executive Chairman [Member]
State tax credits sold by the Company to related party	$ 831,000	$ 694,000	$ 549,000
Former Vice Chairman [Member]
State tax credits sold by the Company to related party	759,000	598,000	244,000
Chief Executive Officer [Member]
State tax credits sold by the Company to related party	119,000	67,000	72,000
Former Chief Executive Officer [Member]
State tax credits sold by the Company to related party	$ 0	$ 0	$ 191,000

Related Parties (Schedule Of Re

Related Parties (Schedule Of Related Party Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total	$ 2,480	$ 2,446	$ 2,485
Leasing Agent Fees [Member]
Total	133	32	101
Operation Of Parking Garages [Member]
Total	95	82	184
Building Management Fees [Member]
Total	1,935	1,954	1,832
Property Construction Management Fees [Member]
Total	136	146	147
Dividends Paid On Company Stock Held By Tower [Member]
Total	$ 181	$ 232	$ 221

Parent Company Condensed Fina_3

Parent Company Condensed Financial Statements (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments in marketable common and preferred stock	$ 2,585,000	$ 48,838,000
Non-agency mortgage-backed securities	1,047,716,000	905,793,000
Equity securities redeemed for cash due to a third-party merger	39,900,000
Commerce Bancshares, Inc. (Parent) [Member]
Note receivable due from bank subsidiary	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	2,500,000
Equity Securities without Readily Determinable Fair Value, Amount	720,000
Non-agency mortgage-backed securities	2,600,000
Equity securities redeemed for cash due to a third-party merger	$ 39,900,000

Parent Company Condensed Fina_4

Parent Company Condensed Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Equity	$ 4,409	$ 50,591
Other assets	382,194	401,074
Total assets	25,463,842	24,833,415
Other liabilities	237,943	180,889
Total liabilities	22,526,693	22,115,231
Stockholders’ equity	2,931,298	2,716,560
Total liabilities and equity	25,463,842	24,833,415
Commerce Bancshares, Inc. (Parent) [Member]
Investment in consolidated subsidiary, Banks	2,587,489	2,409,098
Investment in consolidated subsidiaries, Non-banks	67,538	52,479
Cash	207,462	151,607
Available for sale securities	2,576	4,595
Equity	3,191	49,345
Note receivable due from bank subsidiary	50,000	50,000
Advances to subsidiaries, net of borrowings	19,867	14,571
Income tax benefits	8,590	8,279
Other assets	23,734	19,951
Total assets	2,970,447	2,759,925
Pension obligation	12,645	12,407
Other liabilities	26,504	30,958
Total liabilities	39,149	43,365
Stockholders’ equity	2,931,298	2,716,560
Total liabilities and equity	$ 2,970,447	$ 2,759,925

Parent Company Condensed Fina_5

Parent Company Condensed Financial Statements (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest and dividends on investment securities	$ 240,187	$ 214,689	$ 207,184
Salaries and employee benefits	468,194	448,321	427,310
Data processing fees paid to affiliates	85,978	80,998	79,589
Community Service	2,445	34,377	3,906
Other	64,304	63,366	59,499
Total non-interest expense	737,821	744,343	689,229
Income tax expense (benefit)	105,949	110,506	124,151
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	433,542	319,383	275,391
Commerce Bancshares, Inc. (Parent) [Member]
Dividends received from consolidated subsidiary banks	200,000	160,002	160,002
Earnings of consolidated subsidiaries, net of dividends	233,785	147,678	118,704
Interest and dividends on investment securities	10,698	2,099	2,364
Management fees charged subsidiaries	37,688	30,431	30,965
Investment securities gains (losses)	(4,581)	41,717	1,880
Net interest income on advances and note to subsidiaries	1,299	514	21
Other	2,390	3,346	2,720
Total income	481,279	385,787	316,656
Salaries and employee benefits	33,588	33,714	29,116
Professional fees	2,383	2,036	1,951
Data processing fees paid to affiliates	3,341	3,512	3,226
Community Service	152	32,093	1,620
Other	10,729	10,671	9,849
Total non-interest expense	50,193	82,026	45,762
Income tax expense (benefit)	(2,456)	(15,622)	(4,497)
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	$ 433,542	$ 319,383	$ 275,391

Parent Company Condensed Fina_6

Parent Company Condensed Financial Statements (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES:
Net income	$ 438,214	$ 319,900	$ 276,854
Other changes, net	(5,992)	(13,259)	(7,460)
Net cash provided by (used in) operating activities	552,660	426,527	454,963
INVESTING ACTIVITIES
Proceeds from sales of available for sale securities	708,864	792,380	24,380
Proceeds from maturities/pay downs of available for sale securities	1,510,985	1,899,640	2,032,397
Purchases of investment securities	(2,090,333)	(1,853,817)	(1,988,101)
Purchases of land, buildings and equipment	(33,294)	(30,824)	(24,478)
Net cash provided by (used in) investing activities	(91,024)	220,720	(805,213)
FINANCING ACTIVITIES
Purchases of treasury stock	(75,231)	(17,771)	(39,381)
Cash dividends paid on common stock	(100,238)	(91,619)	(87,070)
Cash dividends paid on preferred stock	(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities	223,252	(924,536)	649,172
Increase (decrease) in cash and cash equivalents	684,888	(277,289)	298,922
Income tax payments (receipts), net	84,172	120,744	119,596
Commerce Bancshares, Inc. (Parent) [Member]
OPERATING ACTIVITIES:
Net income	433,542	319,383	275,391
Earnings of consolidated subsidiaries, net of dividends	(233,785)	(147,678)	(118,704)
Other changes, net	2,505	(11,268)	9,541
Net cash provided by (used in) operating activities	202,262	160,437	166,228
INVESTING ACTIVITIES
(Increase) decrease in securities purchased under agreements to resell	0	155,775	(51,335)
(Increase) decrease in investment in subsidiaries, net	0	11	4
Proceeds from sales of available for sale securities	41,638	11,006	2,949
Proceeds from maturities/pay downs of available for sale securities	1,988	2,295	4,105
Purchases of investment securities	(125)	0	0
Origination of Notes Receivable from Related Parties	0	(50,000)	0
(Increase) decrease in advances to subsidiaries, net	(5,296)	(9,518)	13,507
Purchases of land, buildings and equipment	(133)	(52)	(3)
Net cash provided by (used in) investing activities	38,072	109,517	(30,773)
FINANCING ACTIVITIES
Purchases of treasury stock	(75,231)	(17,771)	(39,381)
Issuance of stock under equity compensation plans	(10)	(8)	(6)
Cash dividends paid on common stock	(100,238)	(91,619)	(87,070)
Cash dividends paid on preferred stock	(9,000)	(9,000)	(9,000)
Net cash provided by (used in) financing activities	(184,479)	(118,398)	(135,457)
Increase (decrease) in cash and cash equivalents	55,855	151,556	(2)
Cash and cash equivalents at beginning of year	151,607	51	53
Cash and cash equivalents at end of year	207,462	151,607	51
Income tax payments (receipts), net	$ (1,965)	$ (8,991)	$ (8,958)