Commerce Bancshares (CBSH) 10-K 24 Feb 16 2015 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 09, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
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		96,744,198
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,888,000,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Loans	$ 12,436,692	$ 11,469,238
Allowance for loan losses	(151,532)	(156,532)
Net loans	12,285,160	11,312,706
Loans Receivable Held-for-sale, Amount	7,607	0
Investment securities:
Available for sale Securities	9,777,004	9,523,560
Trading	11,890	15,357
Non-marketable	112,786	106,875
Total investment securities	9,901,680	9,645,792
Federal Funds Sold and Securities Purchased under Agreements to Resell	14,505	32,485
Securities Purchased under Agreements to Resell	875,000	1,050,000
Interest-bearing Deposits in Banks and Other Financial Institutions	23,803	600,744
Cash and due from banks	464,411	467,488
Land, buildings and equipment – net	352,581	357,871
Goodwill	138,921	138,921
Other intangible assets – net	6,669	7,450
Other assets	534,625	380,823
Total assets	24,604,962	23,994,280
LIABILITIES AND STOCKHOLDERS’ EQUITY
Non-interest bearing	7,146,398	6,811,959
Savings, interest checking and money market	10,834,746	10,541,601
Time open and C.D.’s of less than $100,000	785,191	878,433
Time open and C.D.’s of $100,000 and over	1,212,518	1,243,785
Total deposits	19,978,853	19,475,778
Federal funds purchased and securities sold under agreements to repurchase	1,963,552	1,862,518
Other borrowings	103,818	104,058
Other liabilities	191,321	217,680
Total liabilities	22,237,544	21,660,034
Commerce Bancshares, Inc. stockholders’ equity:
Preferred stock, $1 par value	144,784	144,784
Common stock, $5 par value	489,862	484,155
Capital surplus	1,337,677	1,229,075
Retained earnings	383,313	426,648
Treasury stock of 367,487 and 235,986 shares in 2014 and 2013, respectively, at cost	(26,116)	(16,562)
Accumulated other comprehensive income	32,470	62,093
Total Commerce Bancshares, Inc. stockholders’ equity	2,361,990	2,330,193
Non-controlling interest	5,428	4,053
Total equity	2,367,418	2,334,246
Total liabilities and equity	$ 24,604,962	$ 23,994,280

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 4,981,000	$ 0
Investment Securities:
Available for sale securities, pledged	$ 568,257,000	$ 467,143,000
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	97,972,433	96,830,977
Treasury stock, shares	603,003	367,487

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INTEREST INCOME
Interest and fees on loans	$ 456,664	$ 447,157	$ 439,082
Interest and Fee Income, Loans and Leases Held-for-sale	191	0	176
Interest on investment securities	191,801	188,006	189,415
Interest Income, Federal Funds Sold and Securities Purchased under Agreements to Resell	60	101	106
Interest Income, Securities Purchased under Agreements to Resell	13,172	12,473	21,119
Interest on deposits with banks	528	555	387
Total interest income	662,416	648,292	650,285
INTEREST EXPENSE
Savings, interest checking and money market	13,374	13,522	14,355
Time open and C.D.’s of less than $100,000	3,236	4,137	6,002
Time open and C.D.’s of $100,000 and over	6,051	5,926	6,383
Interest on federal funds purchased and securities sold under agreements to repurchase	1,861	1,019	809
Interest on other borrowings	3,574	3,484	3,364
Total interest expense	28,096	28,088	30,913
Net interest income	634,320	620,204	619,372
Provision for loan losses	28,727	29,531	20,353
Net interest income after provision for loan losses	605,593	590,673	599,019
NON-INTEREST INCOME
Bank card transaction fees	178,926	175,806	166,627
Trust fees	119,801	112,158	102,529
Deposit account charges and other fees	80,416	78,680	79,017
Noninterest Income, Other	11,476	12,667	14,133
Capital market fees	13,200	12,006	11,006
Loan fees and sales	8,228	5,108	5,865
Other	35,508	39,553	39,209
Total non-interest income	447,555	435,978	418,386
INVESTMENT SECURITIES GAINS (LOSSES), NET
Change in fair value of other-than-temporary impairment securities	(1,233)	(2,091)	278
Portion recognized in other comprehensive income	750	726	(1,562)
Net impairment losses	(483)	(1,365)	(1,284)
Realized gains on sales and fair value adjustments	6,803	15,489	(3,141)
Investment securities gains (losses), net	6,320	14,124	(4,425)
NON-INTEREST EXPENSE
Salaries and employee benefits	400,701	384,100	366,867
Net occupancy	44,788	45,825	45,639
Equipment	19,086	18,375	18,425
Supplies and communication	22,970	22,432	22,511
Data processing and software	83,944	78,980	78,245
Marketing	16,107	15,676	14,176
Deposit insurance	12,146	11,622	11,167
Other	76,161	79,332	71,638
Total non-interest expense	675,903	656,342	628,668
Income before income taxes	383,565	384,433	384,312
Less income taxes	116,590	121,649	123,195
Net income	266,975	262,784	261,117
Less non-controlling interest expense	3,245	1,030	156
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	263,730	261,754	260,961
Preferred Stock Dividends, Income Statement Impact	9,000	4,050	0
Net Income (Loss) Available to Common Stockholders, Basic	$ 254,730	$ 257,704	$ 260,961
Net income per common share - basic (in dollars per share)	$ 2.56	$ 2.50	$ 2.47
Net income per common share - diluted (in dollars per share)	$ 2.56	$ 2.49	$ 2.46

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 266,975	$ 262,784	$ 261,117
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	(518)	(412)	958
Net unrealized gains on other securities	(31,517)	60,007	(138,960)
Change in pension loss	2,412	(7,233)	11,389
Other comprehensive income	(29,623)	52,362	(126,613)
Comprehensive income	237,352	315,146	134,504
Non-controlling interest expense	3,245	1,030	156
Comprehensive income attributable to Commerce Bancshares, Inc.	$ 234,107	$ 314,116	$ 134,348

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 266,975	$ 262,784	$ 261,117
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	28,727	29,531	20,353
Provision for depreciation and amortization	42,803	42,303	41,944
Amortization of investment security premiums, net	32,618	23,211	30,419
Deferred income tax (benefit) expense	7,432	(540)	9,201
Investment securities (gains) losses, net	(6,320)	(14,124)	4,425
Net gains on sales of loans held for sale	(3,076)	0	0
Proceeds from sales of loans held for sale	97,813	0	0
Origination Of Loans Held For Sale	(103,199)	0	0
Net (increase) decrease in trading securities	(86,045)	16,005	1,358
Stock-based compensation	10,147	8,829	6,427
(Increase) decrease in interest receivable	(4,992)	(2,185)	3,234
Decrease in interest payable	336	(230)	(1,569)
Increase (decrease) in income taxes payable	19,165	344	(1,663)
Net tax benefit related to equity compensation plans	(2,132)	(1,850)	(1,003)
Other changes, net	(11,189)	(3,242)	(12,494)
Net cash provided by (used in) operating activities	289,063	360,836	361,749
INVESTING ACTIVITIES
Cash Acquired from Acquisition	0	0	47,643
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	(43,827)	0
Proceeds from sales of available for sale securities	689,031	64,442	16,299
Proceeds from maturities/pay downs of available for sale securities	2,515,113	1,914,105	2,542,123
Purchases of available for sale securities	(3,542,537)	(2,498,090)	(2,411,153)
Net (increase) decrease in loans	(1,005,657)	(560,890)	(938,223)
Repayments of long-term securities purchased under agreements to resell	0	(450,000)	(125,000)
Proceeds from Securities Purchased under Agreements to Resell	175,000	550,000	175,000
Purchases of land, buildings and equipment	(31,897)	(43,658)	(23,841)
Sales of land, buildings and equipment	5,545	5,236	3,492
Net cash provided by (used in) investing activities	(1,195,402)	(1,062,682)	(713,660)
FINANCING ACTIVITIES
Net increase in non-interest bearing, savings, interest checking and money market deposits	545,147	282,276	801,211
Net decrease in time open and C.D.’s	(124,509)	(57,956)	(82,013)
Repayment of long-term securities sold under agreements to repurchase	0	(350,000)	(50,000)
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase	101,034	865,960	313,008
Repayment of other long-term borrowings	(240)	(1,252)	(1,578)
Increase (decrease) in other short-term borrowings	0	(2,000)	2,000
Proceeds from issuance of preferred stock	0	144,784	0
Purchases of treasury stock	(23,176)	(70,974)	(69,353)
Accelerated stock repurchase agreement net outflow	(100,000)	(200,000)	0
Issuance of stock under stock purchase and equity compensation plans	1,914	8,652	9,426
Net tax benefit related to equity compensation plans	2,132	1,850	1,003
Cash dividends paid on common stock	(84,961)	(84,241)	(82,104)
Cash dividends paid on preferred stock	(9,000)	(4,050)	0
Net cash provided by (used in) financing activities	308,341	533,049	841,600
Increase (decrease) in cash and cash equivalents	(597,998)	(168,797)	489,689
Cash and cash equivalents at beginning of year	1,100,717	1,269,514	779,825
Cash and cash equivalents at end of year	502,719	1,100,717	1,269,514
Supplemental Cash Flow Information:
Income tax payments, net	95,341	120,172	114,336
Interest paid on deposits and borrowings	27,760	28,218	32,432
Loans transferred to foreclosed real estate	3,778	5,074	8,747
Accelerated Share Repurchases, Settlement (Payment) or Receipt	60,000	0	0
Transfer of Loans Held-for-sale to Portfolio Loans	$ 0	$ 0	$ 8,941

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, 2012	$ 2,171,574	$ 0	$ 458,646	$ 1,102,507	$ 477,210	$ (7,580)	$ 136,344	$ 4,447
Net income	261,117				260,961			156
Other comprehensive income	(126,613)						(126,613)
Acquisition of Summit Bancshares, Inc.	43,197		$ 1,001	11,125		31,071
Distributions to non-controlling interest	(848)							(848)
Purchase of treasury stock	(69,353)					(69,353)
Cash dividends paid on common stock	(82,104)				(82,104)
Net tax benefit related to equity compensation plans	1,003			1,003
Stock-based compensation	6,427			6,427
Issuance under stock purchase and equity compensation plans, net	10,242			(14,824)		25,066
5% stock dividend, net	(245)		$ 21,577	173,710	(206,231)	10,699
Balance at Dec. 31, 2013	2,214,397	0	$ 481,224	1,279,948	449,836	(10,097)	9,731	3,755
Net income	262,784				261,754			1,030
Other comprehensive income	52,362						52,362
Distributions to non-controlling interest	(732)							(732)
Issuance of preferred stock	144,784	144,784
Purchase of treasury stock	(70,974)					(70,974)
Accelerated share repurchase forward contract	(200,000)			(60,000)		(140,000)
Cash dividends paid on common stock	(84,241)				(84,241)
Cash dividends paid on preferred stock	(4,050)				(4,050)
Net tax benefit related to equity compensation plans	1,850			1,850
Stock-based compensation	8,829			8,829
Issuance under stock purchase and equity compensation plans, net	9,506			(14,703)		24,209
5% stock dividend, net	(269)		$ 2,931	13,151	(196,651)	180,300
Balance at Dec. 31, 2014	2,334,246	$ 144,784	$ 484,155	1,229,075	426,648	(16,562)	62,093	4,053
Net income	266,975				$ 263,730			3,245
Other comprehensive income	(29,623)						$ (29,623)
Distributions to non-controlling interest	(1,870)							$ (1,870)
Purchase of treasury stock	(23,176)					(23,176)
Accelerated share repurchase forward contract	(100,000)			$ 60,000		$ (160,000)
Cash dividends paid on common stock	(84,961)				$ (84,961)
Cash dividends paid on preferred stock	(9,000)				(9,000)
Net tax benefit related to equity compensation plans	2,132			$ 2,132
Stock-based compensation	10,147			10,147
Issuance under stock purchase and equity compensation plans, net	2,888			(16,615)		$ 19,503
5% stock dividend, net	(340)		$ 5,707	52,938	(213,104)	154,119
Balance at Dec. 31, 2015	$ 2,367,418	$ 144,784	$ 489,862	$ 1,337,677	$ 383,313	$ (26,116)	$ 32,470	$ 5,428

Consolidated Statements Of Cha8

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (per share)	$ 0.857	$ 0.816	$ 0.777
Cash dividends paid on preferred stock (per share)	$ 1.500	$ 0.675	$ 0
Stock dividend rate (percent)	5.00%	5.00%	5.00%

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
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 350 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. 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 amounts for prior years have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. 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. The enterprise that has a controlling financial interest in a VIE is referred to as the primary beneficiary and consolidates the VIE. 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. 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. This evaluation gives appropriate consideration to the design of the entity and the variability that the entity was designed to pass along, the relative power of each party, and to the Company’s relative obligation to absorb losses or receive residual returns of the entity, in relation to such obligations and rights held by each party. 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. The Company invests in low-income housing partnerships which supply funds for the construction and operation of apartment complexes that provide affordable housing to lower income families. As permitted by ASU 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects," issued by the Financial Accounting Standards Board, the Company adopted a new method of accounting for these investments on January 1, 2015. The new method is the practical expedient to the proportional amortization method, which allows the Company to record the amortization of its investments in income tax expense, rather than in non-interest expense. The Company made this change because it believes that presenting the investment performance net of taxes more fairly represents the economics and returns on such investments. The amortization recognized as a component of income tax expense for the year ended December 31, 2015 was $1.9 million . As required by the ASU, all prior period information in this report has been revised to reflect the adoption, resulting in a decrease to non-interest expense and an increase to income tax expense (as originally reported) of $1.4 million and $965 thousand , respectively, for 2014 and 2013. Cash and Cash Equivalents 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. 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, 2015 totaled $84.2 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. Restructured Loans 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, which 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. 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 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 the 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 Company has classified the majority of its investment portfolio 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). Mortgage and asset-backed securities whose credit ratings are below AA at their purchase date are evaluated for OTTI under ASC 325-40-35, which requires evaluations for OTTI at purchase date and in subsequent periods. 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. Premiums and discounts are amortized to interest income over the estimated lives of the 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. Non-marketable securities include certain private equity investments, consisting of both debt and equity instruments. These securities 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 models. Changes in fair value and gains and losses from sales are included in Investment securities gains (losses), net in the consolidated statements of income. Other non-marketable securities acquired for debt and regulatory purposes are accounted for at cost. Trading account securities, which are 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 The Company periodically enters into investments of securities under agreements to resell with large financial institutions. These agreements are accounted for as collateralized financing transactions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian. Collateral is valued daily, and the Company may require counterparties to deposit additional collateral, or the Company may return collateral pledged when appropriate to maintain full collateralization for these transactions. 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. 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 straight-line and accelerated methods, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 8 years for equipment. Leasehold improvements are amortized over the shorter of their estimated useful lives or remaining lease terms. 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. 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, and the assets may be marked down further, reflecting a new cost basis. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense. Intangible Assets Goodwill and intangible assets that have indefinite useful lives are not amortized but are reviewed annually for impairment. 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. Goodwill 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. Other intangible assets 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. The Company has not recorded other-than-temporary impairment losses on these 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. Derivatives As required by current accounting guidance, all derivatives are carried at fair value on the balance sheet. Accounting for changes in the fair value of derivatives (gains and losses) differs depending on whether a qualifying hedge relationship has been designated and on the type of hedge relationship. Derivatives used to hedge the exposure to change in the fair value of an asset, liability, or firm commitment attributable to a particular risk are considered fair value hedges. Under the fair value hedging model, gains or losses attributable to the change in fair value of the derivative, as well as gains and losses attributable to the change in fair value of the hedged item, are recognized in current earnings. Derivatives used to hedge the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Under the cash flow hedging model, the effective portion of the gain or loss related to the derivative is recognized as a component of other comprehensive income and reclassified to earnings in the same period in which the hedged transaction affects earnings. The ineffective portion is recognized in current earnings. At the present time, the Company does not utilize hedge accounting. All of the derivatives currently held by the Company are free-standing instruments, and gains and losses on these derivatives are recognized in current earnings. These 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 recognizing derivatives related to its origination and sales program of certain personal real estate mortgages, which included mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities. 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. 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 10, Employee Benefit Plans. 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 fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated. Stock-Based Compensation The Company’s stock-based employee compensation plan is described in Note 11, Stock-Based Compensation and Directors Stock Purchase Plan. 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. The fair value of an award is estimated using the Black-Scholes option-pricing model. The expense recognized is based on an estimation of the number of awards for which the requisite service is expected to be rendered and is included in salaries and employee benefits in the accompanying consolidated statements of income. 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 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 options and 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 restricted share 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 2015 .

Acquisitions and Dispositions (

Acquisitions and Dispositions (Notes)	12 Months Ended
	Dec. 31, 2015
Acquisitions and Dispositions [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	Acquisition and Disposition On September 1, 2013, the Company acquired Summit Bancshares Inc. (Summit). Summit's results of operations are included in the Company's consolidated financial results beginning on that date. The transaction was accounted for using the acquisition method of accounting, and as such, assets acquired, liabilities assumed and consideration exchanged were recorded at their estimated fair value on the acquisition date. In this transaction, the Company acquired all of the outstanding stock of Summit in exchange for shares of Company stock valued at $43.2 million . The Company's acquisition of Summit added $261.6 million in assets (including $207.4 million in loans), $232.3 million in deposits and two branch locations in Tulsa and Oklahoma City, Oklahoma. Intangible assets recognized as a result of the transaction consisted of approximately $13.3 million in goodwill and $5.6 million in core deposit premium. Most of the goodwill was assigned to the Company's Commercial segment. None of the goodwill recognized is deductible for income tax purposes. On July 25, 2014, the Company sold banking branches in Farmington, Desloge and Bonne Terre, Missouri. The sale included approximately $13.3 million in loans, $60.3 million in deposits, and various bank premises. The Company recognized a $2.1 million gain on the sale.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2015
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 to maturity loan portfolio at December 31, 2015 and 2014 are as follows: (In thousands) 2015 2014 Commercial: Business $ 4,397,893 $ 3,969,952 Real estate — construction and land 624,070 403,507 Real estate — business 2,355,544 2,288,215 Personal Banking: Real estate — personal 1,915,953 1,883,092 Consumer 1,924,365 1,705,134 Revolving home equity 432,981 430,873 Consumer credit card 779,744 782,370 Overdrafts 6,142 6,095 Total loans $ 12,436,692 $ 11,469,238 Loans to directors and executive officers of the Parent and the Bank, and to their associates, are summarized as follows: (In thousands) Balance at January 1, 2015 $ 55,273 Additions 246,475 Amounts collected (250,581 ) Amounts written off — Balance, December 31, 2015 $ 51,167 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, 2015 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, 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 three 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, 2015 , unfunded loan commitments totaled $10.0 billion (which included $4.7 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, 2015 , loans totaling $ 3.6 billion were pledged at the FHLB as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $ 1.5 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings. The Company has a net investment in direct financing and sales type leases of $463.1 million and $413.0 million at December 31, 2015 and 2014 , respectively, which is included in business loans on the Company’s consolidated balance sheets. This investment includes deferred income of $ 29.4 million and $ 26.4 million at December 31, 2015 and 2014 , respectively. The net investment in operating leases amounted to $ 16.9 million and $ 22.8 million at December 31, 2015 and 2014 , 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, 2012 $ 105,725 $ 66,807 $ 172,532 Provision for loan losses (16,143 ) 36,496 20,353 Deductions: Loans charged off 5,170 49,029 54,199 Less recoveries 9,777 13,069 22,846 Net loans charged off (recoveries) (4,607 ) 35,960 31,353 Balance at December 31, 2013 94,189 67,343 161,532 Provision for loan losses (5,204 ) 34,735 29,531 Deductions: Loans charged off 4,548 48,225 52,773 Less recoveries 5,185 13,057 18,242 Net loans charged off (recoveries) (637 ) 35,168 34,531 Balance at December 31, 2014 89,622 66,910 156,532 Provision for loan losses (9,319 ) 38,046 28,727 Deductions: Loans charged off 4,057 46,993 51,050 Less recoveries 5,840 11,483 17,323 Net loans charged off (recoveries) (1,783 ) 35,510 33,727 Balance at December 31, 2015 $ 82,086 $ 69,446 $ 151,532 The following table shows the balance in the allowance for loan losses and the related loan balance at December 31, 2015 and 2014 , 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, 2015 Commercial $ 1,927 $ 43,027 $ 80,159 $ 7,334,480 Personal Banking 1,557 22,287 67,889 5,036,898 Total $ 3,484 $ 65,314 $ 148,048 $ 12,371,378 December 31, 2014 Commercial $ 4,527 $ 55,551 $ 85,095 $ 6,606,123 Personal Banking 2,314 25,537 64,596 4,782,027 Total $ 6,841 $ 81,088 $ 149,691 $ 11,388,150 Impaired loans The table below shows the Company’s investment in impaired loans at December 31, 2015 and 2014 . 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 76. (In thousands) 2015 2014 Non-accrual loans $ 26,575 $ 40,775 Restructured loans (accruing) 38,739 40,313 Total impaired loans $ 65,314 $ 81,088 The following table provides additional information about impaired loans held by the Company at December 31, 2015 and 2014 , 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, 2015 With no related allowance recorded: Business $ 9,330 $ 11,777 $ — Real estate – construction and land 2,961 8,956 — Real estate – business 4,793 6,264 — Real estate – personal 373 373 — $ 17,457 $ 27,370 $ — With an allowance recorded: Business $ 18,227 $ 20,031 $ 1,119 Real estate – construction and land 1,227 2,804 63 Real estate – business 6,489 9,008 745 Real estate – personal 7,667 10,530 831 Consumer 5,599 5,599 63 Revolving home equity 704 852 67 Consumer credit card 7,944 7,944 596 $ 47,857 $ 56,768 $ 3,484 Total $ 65,314 $ 84,138 $ 3,484 December 31, 2014 With no related allowance recorded: Business $ 9,237 $ 11,532 $ — Real estate – construction and land 4,552 8,493 — Real estate – business 13,453 17,258 — Revolving home equity 1,227 1,384 — $ 28,469 $ 38,667 $ — With an allowance recorded: Business $ 12,326 $ 13,846 $ 1,844 Real estate – construction and land 8,148 9,610 1,081 Real estate – business 7,835 15,025 1,602 Real estate – personal 9,096 12,465 1,441 Consumer 4,244 4,244 50 Revolving home equity 529 529 9 Consumer credit card 10,441 10,441 814 $ 52,619 $ 66,160 $ 6,841 Total $ 81,088 $ 104,827 $ 6,841 Total average impaired loans during 2015 and 2014 are shown in the table below. 2015 2014 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Average impaired loans: Non-accrual loans $ 24,284 $ 5,449 $ 29,733 $ 38,114 $ 7,132 $ 45,246 Restructured loans (accruing) 16,671 18,395 35,066 33,156 20,040 53,196 Total $ 40,955 $ 23,844 $ 64,799 $ 71,270 $ 27,172 $ 98,442 The table below shows interest income recognized during the years ended December 31, 2015 , 2014 and 2013 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously. For the Year Ended December 31 (In thousands) 2015 2014 2013 Interest income recognized on impaired loans: Business $ 495 $ 344 $ 509 Real estate – construction and land 80 361 758 Real estate – business 122 153 215 Real estate – personal 187 208 263 Consumer 348 286 346 Revolving home equity 20 27 36 Consumer credit card 750 993 1,116 Total $ 2,002 $ 2,372 $ 3,243 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, 2015 and 2014 . (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, 2015 Commercial: Business $ 4,384,149 $ 2,306 $ 564 $ 10,874 $ 4,397,893 Real estate – construction and land 617,838 3,142 — 3,090 624,070 Real estate – business 2,340,919 6,762 — 7,863 2,355,544 Personal Banking: Real estate – personal 1,901,330 7,117 3,081 4,425 1,915,953 Consumer 1,903,389 18,273 2,703 — 1,924,365 Revolving home equity 427,998 2,641 2,019 323 432,981 Consumer credit card 762,750 8,894 8,100 — 779,744 Overdrafts 5,834 308 — — 6,142 Total $ 12,344,207 $ 49,443 $ 16,467 $ 26,575 $ 12,436,692 December 31, 2014 Commercial: Business $ 3,946,144 $ 11,152 $ 1,096 $ 11,560 $ 3,969,952 Real estate – construction and land 397,488 827 35 5,157 403,507 Real estate – business 2,266,688 3,661 — 17,866 2,288,215 Personal Banking: Real estate – personal 1,868,606 6,618 1,676 6,192 1,883,092 Consumer 1,687,285 16,053 1,796 — 1,705,134 Revolving home equity 428,478 1,552 843 — 430,873 Consumer credit card 764,599 9,559 8,212 — 782,370 Overdrafts 5,721 374 — — 6,095 Total $ 11,365,009 $ 49,796 $ 13,658 $ 40,775 $ 11,469,238 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, 2015 Pass $ 4,278,857 $ 618,788 $ 2,281,565 $ 7,179,210 Special mention 49,302 1,033 15,009 65,344 Substandard 58,860 1,159 51,107 111,126 Non-accrual 10,874 3,090 7,863 21,827 Total $ 4,397,893 $ 624,070 $ 2,355,544 $ 7,377,507 December 31, 2014 Pass $ 3,871,569 $ 385,831 $ 2,184,541 $ 6,441,941 Special mention 62,904 3,865 40,668 107,437 Substandard 23,919 8,654 45,140 77,713 Non-accrual 11,560 5,157 17,866 34,583 Total $ 3,969,952 $ 403,507 $ 2,288,215 $ 6,661,674 The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above section on "Delinquent and non-accrual loans" . In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a person's financial history. The bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because the loans are related to commercial activity. These loans totaled $257.8 million at December 31, 2015 and $244.3 million at December 31, 2014 ; less than 6.0% 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, 2015 and 2014 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card December 31, 2015 FICO score: Under 600 1.5 % 4.5 % 1.5 % 3.9 % 600 – 659 3.0 9.7 3.9 12.0 660 – 719 9.1 21.8 13.6 31.7 720 – 779 25.0 26.4 28.4 27.9 780 and over 61.4 37.6 52.6 24.5 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2014 FICO score: Under 600 1.4 % 5.2 % 1.8 % 4.1 % 600 – 659 3.1 10.2 4.4 11.8 660 – 719 9.9 22.9 13.7 32.4 720 – 779 26.7 28.0 32.8 27.8 780 and over 58.9 33.7 47.3 23.9 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. Total restructured loans amounted to $53.7 million at December 31, 2015 . 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, and those non-accrual loans totaled $14.9 million at December 31, 2015 . Other performing restructured loans totaled $38.7 million at December 31, 2015 . These are partly comprised of certain business, construction and business real estate loans classified as substandard. Upon maturity, the loans renewed at interest rates judged not to be market rates for new debt with similar risk and as a result were classified as troubled debt restructurings. These commercial loans totaled $21.9 million and $21.8 million at December 31, 2015 and 2014 , respectively. 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. Troubled debt restructurings also include certain credit card loans under various debt management and assistance programs, which totaled $7.9 million at December 31, 2015 and $10.4 million at December 31, 2014 . Modifications to credit card loans generally involve removing the available line of credit, placing loans on amortizing status, and lowering the contractual interest rate. The Company also classifies certain loans as troubled debt restructurings because they were not reaffirmed by the borrower in bankruptcy proceedings. These loans, which are comprised of personal real estate, revolving home equity and consumer loans, totaled $8.5 million and $8.1 million at December 31, 2015 and 2014 , respectively. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments. The table below shows the outstanding balance of loans classified as troubled debt restructurings at December 31, 2015 , in addition to the period end balances of 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, 2015 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 26,248 $ — Real estate – construction and land 4,116 1,081 Real estate – business 4,793 — Personal Banking: Real estate – personal 4,547 27 Consumer 5,623 43 Revolving home equity 391 43 Consumer credit card 7,944 586 Total restructured loans $ 53,662 $ 1,780 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 consumer credit card loans were estimated to decrease interest income by approximately $1.1 million on an annual, pre-tax basis, compared to amounts contractually owed. 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 have had no other concessions granted other than being renewed at an interest rate judged not to be market. As such, they 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 $ 3.5 million at December 31, 2015 to lend additional funds to borrowers with restructured loans, compared to $6.9 million at December 31, 2014. Loans held for sale Beginning January 1, 2015, certain long-term fixed rate personal real estate loan originations have been designated 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. At December 31, 2015 , the fair value of these loans was $5.0 million , and the unpaid principal balance was $4.9 million . The unrealized gain in fair value was recognized in loan fees and sales in the consolidated statements of income. None of these loans were on non-accrual status or past due. Interest income with respect to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate. Beginning in the third quarter of 2015, the Company has designated 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 at various times while the student is attending school or shortly after graduation. At December 31, 2015 , the balance of these loans was $2.6 million . These loans are carried at lower of cost or fair value, and none were on non-accrual status or past due. Foreclosed real estate/repossessed assets The Company’s holdings of foreclosed real estate totaled $ 2.8 million and $ 5.5 million at December 31, 2015 and 2014 , respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $ 3.3 million and $ 2.4 million at December 31, 2015 and 2014 , 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, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities, at fair value, consisted of the following at December 31, 2015 and 2014 . (In thousands) 2015 2014 Available for sale: U.S. government and federal agency obligations $ 727,076 $ 501,407 Government-sponsored enterprise obligations 793,023 963,127 State and municipal obligations 1,741,957 1,813,201 Agency mortgage-backed securities 2,618,281 2,593,708 Non-agency mortgage-backed securities 879,963 382,744 Asset-backed securities 2,644,381 3,091,993 Other debt securities 331,320 139,161 Equity securities 41,003 38,219 Total available for sale 9,777,004 9,523,560 Trading 11,890 15,357 Non-marketable 112,786 106,875 Total investment securities $ 9,901,680 $ 9,645,792 Most of the Company’s investment securities are classified as available for sale, and this portfolio is discussed in more detail below. Securities which are classified as non-marketable include Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank stock held for borrowing and regulatory purposes, which totaled $46.8 million and $46.6 million at December 31, 2015 and 2014 , respectively. Investment in Federal Reserve Bank stock is based on the capital structure of the investing bank, and investment in FHLB stock is mainly tied to the level of borrowings from the FHLB. These holdings are carried at cost. Non-marketable securities also include private equity investments, which amounted to $65.6 million and $60.2 million at December 31, 2015 and 2014 , respectively. In the absence of readily ascertainable market values, these securities are carried at estimated fair value. A summary of the available for sale investment securities by maturity groupings as of December 31, 2015 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, 2015 . 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 mortgages. Also included are certain other asset-backed securities, primarily collateralized by credit cards, automobiles and commercial loans. 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 $ 59,506 $ 59,870 1.82*% After 1 but within 5 years 474,370 476,793 1.56* After 5 but within 10 years 143,468 142,759 .63* After 10 years 52,502 47,654 .02* Total U.S. government and federal agency obligations 729,846 727,076 1.29* Government-sponsored enterprise obligations: Within 1 year 15,725 15,818 2.08 After 1 but within 5 years 619,406 618,442 1.62 After 5 but within 10 years 154,151 153,327 2.41 After 10 years 5,630 5,436 2.51 Total government-sponsored enterprise obligations 794,912 793,023 1.79 State and municipal obligations: Within 1 year 105,233 105,507 2.78 After 1 but within 5 years 673,068 688,528 2.40 After 5 but within 10 years 870,631 889,719 2.43 After 10 years 57,703 58,203 3.16 Total state and municipal obligations 1,706,635 1,741,957 2.46 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,579,031 2,618,281 2.62 Non-agency mortgage-backed securities 879,186 879,963 2.54 Asset-backed securities 2,660,201 2,644,381 1.33 Total mortgage and asset-backed securities 6,118,418 6,142,625 2.05 Other debt securities: Within 1 year 9,294 9,359 After 1 but within 5 years 94,871 94,140 After 5 but within 10 years 219,760 216,285 After 10 years 12,000 11,536 Total other debt securities 335,925 331,320 Equity securities 5,678 41,003 Total available for sale investment securities $ 9,691,414 $ 9,777,004 * Rate does not reflect inflation adjustment on inflation-protected securities Investments in U.S. government securities include U.S. Treasury inflation-protected securities, which totaled $416.8 million , at fair value, at December 31, 2015 . 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 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. In December 2015, auction rate securities with a par value of $80.8 million were called by the issuer, reducing the Company's holdings to $17.2 million , at fair value, at December 31, 2015. Equity securities are primarily comprised of investments in common stock held by the Parent, which totaled $38.3 million , at fair value, at December 31, 2015 . For 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, 2015 U.S. government and federal agency obligations $ 729,846 $ 5,051 $ (7,821 ) $ 727,076 Government-sponsored enterprise obligations 794,912 2,657 (4,546 ) 793,023 State and municipal obligations 1,706,635 37,061 (1,739 ) 1,741,957 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,579,031 47,856 (8,606 ) 2,618,281 Non-agency mortgage-backed securities 879,186 8,596 (7,819 ) 879,963 Asset-backed securities 2,660,201 1,287 (17,107 ) 2,644,381 Total mortgage and asset-backed securities 6,118,418 57,739 (33,532 ) 6,142,625 Other debt securities 335,925 377 (4,982 ) 331,320 Equity securities 5,678 35,325 — 41,003 Total $ 9,691,414 $ 138,210 $ (52,620 ) $ 9,777,004 December 31, 2014 U.S. government and federal agency obligations $ 497,336 $ 9,095 $ (5,024 ) $ 501,407 Government-sponsored enterprise obligations 968,574 2,593 (8,040 ) 963,127 State and municipal obligations 1,789,215 32,340 (8,354 ) 1,813,201 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,523,377 75,923 (5,592 ) 2,593,708 Non-agency mortgage-backed securities 372,911 11,061 (1,228 ) 382,744 Asset-backed securities 3,090,174 6,922 (5,103 ) 3,091,993 Total mortgage and asset-backed securities 5,986,462 93,906 (11,923 ) 6,068,445 Other debt securities 140,784 420 (2,043 ) 139,161 Equity securities 3,931 34,288 — 38,219 Total $ 9,386,302 $ 172,642 $ (35,384 ) $ 9,523,560 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 A3 (Moody's) or A- (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, 2015 , the fair value of securities on this watch list was $95.8 million compared to $123.9 million at December 31, 2014 . As of December 31, 2015 , the Company had recorded OTTI on certain non-agency mortgage-backed securities, part of the watch list mentioned above, which had an aggregate fair value of $44.0 million . The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $14.1 million . The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost. The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 17% - 53% Credit support 0% - 24% Loss severity 19% - 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) 2015 2014 2013 Cumulative OTTI credit losses at January 1 $ 13,734 $ 12,499 $ 11,306 Credit losses on debt securities for which impairment was not previously recognized 76 — — Credit losses on debt securities for which impairment was previously recognized 407 1,365 1,284 Increase in expected cash flows that are recognized over remaining life of security (88 ) (130 ) (91 ) Cumulative OTTI credit losses at December 31 $ 14,129 $ 13,734 $ 12,499 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, 2015 U.S. government and federal agency obligations $ 491,998 $ 3,098 $ 31,012 $ 4,723 $ 523,010 $ 7,821 Government-sponsored enterprise obligations 157,830 1,975 110,250 2,571 268,080 4,546 State and municipal obligations 66,998 544 31,120 1,195 98,118 1,739 Mortgage and asset-backed securities: Agency mortgage-backed securities 530,035 2,989 291,902 5,617 821,937 8,606 Non-agency mortgage-backed securities 653,603 7,059 54,536 760 708,139 7,819 Asset-backed securities 2,207,922 12,492 223,311 4,615 2,431,233 17,107 Total mortgage and asset-backed securities 3,391,560 22,540 569,749 10,992 3,961,309 33,532 Other debt securities 244,452 3,687 25,218 1,295 269,670 4,982 Total $ 4,352,838 $ 31,844 $ 767,349 $ 20,776 $ 5,120,187 $ 52,620 December 31, 2014 U.S. government and federal agency obligations $ 90,261 $ 818 $ 32,077 $ 4,206 $ 122,338 $ 5,024 Government-sponsored enterprise obligations 224,808 922 224,779 7,118 449,587 8,040 State and municipal obligations 172,980 646 215,702 7,708 388,682 8,354 Mortgage and asset-backed securities: Agency mortgage-backed securities 55,128 429 381,617 5,163 436,745 5,592 Non-agency mortgage-backed securities 141,655 609 43,659 619 185,314 1,228 Asset-backed securities 1,424,457 2,009 159,098 3,094 1,583,555 5,103 Total mortgage and asset-backed securities 1,621,240 3,047 584,374 8,876 2,205,614 11,923 Other debt securities 16,434 55 80,203 1,988 96,637 2,043 Total $ 2,125,723 $ 5,488 $ 1,137,135 $ 29,896 $ 3,262,858 $ 35,384 The total available for sale portfolio consisted of approximately 2,000 individual securities at December 31, 2015 . The portfolio included 466 securities, having an aggregate fair value of $ 5.1 billion , that were in a loss position at December 31, 2015 , compared to 363 securities, with a fair value of $3.3 billion , at December 31, 2014 . The total amount of unrealized loss on these securities increased $17.2 million to $52.6 million . At December 31, 2015 , the fair value of securities in an unrealized loss position for 12 months or longer totaled $ 767.3 million , or 7.8% of the total portfolio value, and included only one security identified as other-than-temporarily impaired. The Company’s holdings of state and municipal obligations included gross unrealized losses of $ 1.7 million at December 31, 2015 . Of these losses, $ 1.2 million related to auction rate securities and $ 566 thousand related to other state and municipal obligations. The state and municipal portfolio totaled $ 1.7 billion at fair value, or 17.8% of total available for sale securities. The portfolio is diversified in order to reduce risk, and the Company has processes and procedures in place to monitor its state and municipal holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner. The credit ratings (Moody’s rating or equivalent) at December 31, 2015 in the state and municipal bond portfolio (excluding auction rate securities) are shown in the following table. The average credit quality of the portfolio is Aa2 as rated by Moody’s. % of Portfolio Aaa 6.7 % Aa 78.0 A 14.6 Not rated .7 100.0 % The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. (In thousands) 2015 2014 2013 Proceeds from sales of available for sale securities $ 675,870 $ 30,998 $ 7,076 Proceeds from sales of non-marketable securities 13,161 33,444 9,223 Total proceeds $ 689,031 $ 64,442 $ 16,299 Available for sale: Gains realized on sales $ 2,925 $ — $ 126 Losses realized on sales — (5,197 ) — Gain realized on donation — 1,570 1,375 Other-than-temporary impairment recognized on debt securities (483 ) (1,365 ) (1,284 ) Non-marketable: Gains realized on sales 2,516 1,629 1,808 Losses realized on sales (40 ) (134 ) (2,979 ) Fair value adjustments, net 1,402 17,621 (3,471 ) Investment securities gains (losses), net $ 6,320 $ 14,124 $ (4,425 ) Investment securities with a fair value of $ 4.1 billion and $4.7 billion were pledged at December 31, 2015 and 2014 , 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 $ 568.3 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, 2015
Property, Plant and Equipment [Abstract]
Land, Buildings And Equipment	Land, Buildings and Equipment Land, buildings and equipment consist of the following at December 31, 2015 and 2014 : (In thousands) 2015 2014 Land $ 105,182 $ 106,599 Buildings and improvements 541,736 535,039 Equipment 250,193 244,239 Total 897,111 885,877 Less accumulated depreciation 544,530 528,006 Net land, buildings and equipment $ 352,581 $ 357,871 Depreciation expense of $ 30.1 million , $ 29.8 million and $ 30.7 million for 2015 , 2014 and 2013 , respectively, was included in occupancy expense and equipment expense in the consolidated statements of income. Repairs and maintenance expense of $ 16.3 million , $ 16.5 million and $ 16.8 million for 2015 , 2014 and 2013 , 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, 2015
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, 2015 December 31, 2014 ( 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 $ (26,239 ) $ — $ 5,031 $ 31,270 $ (24,698 ) $ — $ 6,572 Mortgage servicing rights 4,638 (2,971 ) (29 ) 1,638 3,693 (2,718 ) (97 ) 878 Total $ 35,908 $ (29,210 ) $ (29 ) $ 6,669 $ 34,963 $ (27,416 ) $ (97 ) $ 7,450 The carrying amount of goodwill and its allocation among segments at December 31, 2015 and 2014 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2015 , 2014 or 2013 . Further, the annual assessment of qualitative factors on January 1, 2016 revealed no likelihood of impairment as of that date. (In thousands) December 31, 2015 December 31, 2014 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, 2015 and 2014 are shown in the following table. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance at December 31, 2013 $ 138,921 $ 8,489 $ 779 Originations — — 263 Amortization — (1,917 ) (151 ) Impairment — — (13 ) Balance at December 31, 2014 138,921 6,572 878 Originations — — 945 Amortization — (1,541 ) (253 ) Impairment reversal — — 68 Balance at December 31, 2015 $ 138,921 $ 5,031 $ 1,638 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. At December 31, 2015 , temporary impairment of $29 thousand had been recognized. Temporary impairment, including impairment recovery, is effected through a change in a valuation allowance. 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, 2015 , 2014 and 2013 was $1.8 million , $2.1 million and $2.2 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, 2015 . 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) 2016 $ 1,412 2017 1,068 2018 817 2019 677 2020 553

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Deposits	Deposits At December 31, 2015 , the scheduled maturities of total time open and certificates of deposit were as follows: (In thousands) Due in 2016 $ 1,547,305 Due in 2017 212,969 Due in 2018 125,508 Due in 2019 46,533 Due in 2020 61,059 Thereafter 4,335 Total $ 1,997,709 The following table shows a detailed breakdown of the maturities of time open and certificates of deposit, by size category, at December 31, 2015 . (In thousands) Certificates of Deposit under $100,000 Other Time Deposits under $100,000 Certificates of Deposit over $100,000 Other Time Deposits over $100,000 Total Due in 3 months or less $ 144,126 $ 28,527 $ 317,181 $ 13,995 $ 503,829 Due in over 3 through 6 months 157,787 31,508 338,601 17,505 545,401 Due in over 6 through 12 months 234,347 46,719 182,054 34,955 498,075 Due in over 12 months 83,037 59,140 298,460 9,767 450,404 Total $ 619,297 $ 165,894 $ 1,136,296 $ 76,222 $ 1,997,709 The aggregate amount of time open and certificates of deposit that exceeded the $250,000 FDIC insurance limit totaled $922.1 million at December 31, 2015 .

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table sets forth selected information for short-term borrowings (borrowings with an original maturity of less than one year). (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: 2015 .2 % .1 % $ 1,654,860 $ 2,193,197 $ 1,963,552 2014 .1 .1 1,119,578 1,862,518 1,862,518 2013 .1 .1 914,554 1,479,849 996,558 Short-term borrowings consist primarily of federal funds purchased and securities sold under agreements to repurchase (repurchase agreements), which generally have one day maturities. Short-term repurchase agreements at December 31, 2015 were comprised of non-insured customer funds totaling $1.4 billion , which were 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. 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, 2015 , total outstanding advances were $ 103.8 million with a weighted interest rate of 3.5% and a remaining maturity of two years. All of the outstanding advances have fixed interest rates and contain prepayment penalties. The FHLB has also issued letters of credit, totaling $ 291.5 million at December 31, 2015 , to secure the Company’s obligations to certain depositors of public funds.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income tax expense from operations for the years ended December 31, 2015 , 2014 and 2013 were as follows: (In thousands) Current Deferred Total Year ended December 31, 2015: U.S. federal $ 102,607 $ 7,084 $ 109,691 State and local 6,551 348 6,899 Total $ 109,158 $ 7,432 $ 116,590 Year ended December 31, 2014: U.S. federal $ 110,552 $ (679 ) $ 109,873 State and local 11,637 139 11,776 Total $ 122,189 $ (540 ) $ 121,649 Year ended December 31, 2013: U.S. federal $ 103,094 $ 7,984 $ 111,078 State and local 10,900 1,217 12,117 Total $ 113,994 $ 9,201 $ 123,195 The components of income tax (benefit) expense recorded directly to stockholders’ equity for the years ended December 31, 2015 , 2014 and 2013 were as follows: (In thousands) 2015 2014 2013 Unrealized gain (loss) on securities available for sale $ (19,634 ) $ 36,525 $ (84,582 ) Accumulated pension (benefit) loss 1,478 (4,433 ) 6,981 Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes (2,132 ) (1,850 ) (1,003 ) Income tax (benefit) expense allocated to stockholders’ equity $ (20,288 ) $ 30,242 $ (78,604 ) Significant components of the Company’s deferred tax assets and liabilities at December 31, 2015 and 2014 were as follows: (In thousands) 2015 2014 Deferred tax assets: Loans, principally due to allowance for loan losses $ 60,885 $ 68,014 Accrued expenses 15,080 14,590 Equity-based compensation 12,733 12,689 Private equity investments 8,157 6,001 Deferred compensation 7,751 7,397 Pension 5,078 5,885 Other 5,291 10,172 Total deferred tax assets 114,975 124,748 Deferred tax liabilities: Equipment lease financing 67,938 67,531 Unrealized gain on securities available for sale 32,524 52,158 Land, buildings and equipment 12,186 14,520 Intangibles 7,674 7,532 Accretion on investment securities 5,893 5,919 Other 4,129 3,181 Total deferred tax liabilities 130,344 150,841 Net deferred tax assets (liabilities) $ (15,369 ) $ (26,093 ) Management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the total deferred tax assets. A reconciliation between the expected federal income tax expense using the federal statutory tax rate of 35% and the Company’s actual income tax expense for 2015 , 2014 and 2013 is provided in the table below. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense. (In thousands) 2015 2014 2013 Computed “expected” tax expense $ 133,112 $ 134,191 $ 134,455 Increase (decrease) in income taxes resulting from: Tax-exempt interest, net of cost to carry (19,083 ) (17,806 ) (16,612 ) State and local income taxes, net of federal tax benefit 4,484 7,655 7,876 Tax deductible dividends on allocated shares held by the Company’s ESOP (1,093 ) (1,116 ) (1,116 ) Other (830 ) (1,275 ) (1,408 ) Total income tax expense $ 116,590 $ 121,649 $ 123,195 The gross amount of unrecognized tax benefits was $1.3 million at both December 31, 2015 and 2014 , and the total amount of unrecognized tax benefits that would impact the effective tax rate, if recognized, was $830 thousand and $852 thousand , respectively. The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2015 and 2014 was as follows: (In thousands) 2015 2014 Unrecognized tax benefits at beginning of year $ 1,312 $ 1,428 Gross increases – tax positions in prior period 40 20 Gross decreases – tax positions in prior period — (5 ) Gross increases – current-period tax positions 272 299 Lapse of statute of limitations (346 ) (430 ) Unrecognized tax benefits at end of year $ 1,278 $ 1,312 The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2012 through 2015 remain open to examination for U.S. federal income tax as well as income tax in major state taxing jurisdictions.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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) 2015 2014 2013 Payroll taxes $ 22,235 $ 21,417 $ 21,118 Medical plans 20,659 22,855 18,490 401(k) plan 12,841 12,057 12,465 Pension plans 1,495 2,555 1,627 Other 2,950 2,585 2,988 Total employee benefits $ 60,180 $ 61,469 $ 56,688 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 2015 or 2014 , and the minimum required contribution for 2016 is expected to be zero . The Company does not expect to make any further contributions in 2016 other than the necessary funding contributions to the CERP. Contributions to the CERP were $20 thousand , $69 thousand and $69 thousand during 2015 , 2014 and 2013 , respectively. As noted in the table below, pension cost in 2014 included a settlement loss of $1.7 million , resulting from a cash-out opportunity offered during the year to certain vested inactive participants with deferred benefits. The following items are components of the net pension cost for the years ended December 31, 2015 , 2014 and 2013 . (In thousands) 2015 2014 2013 Service cost-benefits earned during the year $ 503 $ 430 $ 509 Interest cost on projected benefit obligation 4,762 5,069 4,509 Expected return on plan assets (6,092 ) (6,285 ) (6,476 ) Amortization of prior service cost (271 ) — — Amortization of unrecognized net loss 2,593 1,654 3,085 Settlement loss recognized — 1,687 — Net periodic pension cost $ 1,495 $ 2,555 $ 1,627 The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2015 and 2014 . (In thousands ) 2015 2014 Change in projected benefit obligation Projected benefit obligation at prior valuation date $ 125,447 $ 113,673 Service cost 503 430 Interest cost 4,762 5,069 Plan settlements — (7,163 ) Plan amendments (2,619 ) — Benefits paid (6,400 ) (5,193 ) Actuarial (gain) loss (4,131 ) 18,631 Projected benefit obligation at valuation date 117,562 125,447 Change in plan assets Fair value of plan assets at prior valuation date 104,794 107,172 Actual return on plan assets 911 9,909 Employer contributions 20 69 Plan settlements — (7,163 ) Benefits paid (6,400 ) (5,193 ) Fair value of plan assets at valuation date 99,325 104,794 Funded status and net amount recognized at valuation date $ (18,237 ) $ (20,653 ) The accumulated benefit obligation, which represents the liability of a plan using only benefits as of the measurement date, was $ 117.6 million and $ 125.4 million for the combined plans on December 31, 2015 and 2014 , respectively. Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) at December 31, 2015 and 2014 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis. (In thousands) 2015 2014 Prior service credit $ 2,348 $ — Accumulated loss (35,602 ) (37,145 ) Accumulated other comprehensive loss (33,254 ) (37,145 ) Cumulative employer contributions in excess of net periodic benefit cost 15,017 16,492 Net amount recognized as an accrued benefit liability on the December 31 balance sheet $ (18,237 ) $ (20,653 ) Prior service cost $ 2,618 $ — Net loss arising during period (1,050 ) (15,007 ) Amortization or settlement recognition of net loss 2,593 3,341 Amortization of prior service credit (271 ) — Total recognized in other comprehensive income $ 3,890 $ (11,666 ) Total income (expense) recognized in net periodic pension cost and other comprehensive income $ 2,395 $ (14,221 ) The estimated net loss and prior service credit to be amortized from accumulated other comprehensive income into net periodic pension cost in 2016 is $ 2.3 million . The following assumptions, on a weighted average basis, were used in accounting for the plans. 2015 2014 2013 Determination of benefit obligation at year end: Discount rate 4.15 % 3.95 % 4.55 % Assumed credit on cash balance accounts 5.00 % 5.00 % 5.00 % Determination of net periodic benefit cost for year ended: Discount rate 3.95 % 4.55 % 3.65 % Long-term rate of return on assets 6.00 % 6.00 % 6.50 % 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, 2015 and 2014 . 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, 2015 Assets: U.S. government obligations $ 2,540 $ 2,540 $ — $ — Government-sponsored enterprise obligations (a) 1,208 — 1,208 — State and municipal obligations 10,478 — 10,478 — Agency mortgage-backed securities (b) 1,352 — 1,352 — Non-agency mortgage-backed securities 5,740 — 5,740 — Asset-backed securities 6,965 — 6,965 — Corporate bonds (c) 32,800 — 32,800 — Equity securities and mutual funds: (d) U.S. large-cap 15,746 15,746 — — U.S. mid-cap 12,960 12,960 — — U.S. small-cap 2,545 2,545 — — International developed markets 3,125 3,125 — — Emerging markets 392 392 — — Money market funds 3,474 3,474 — — Total $ 99,325 $ 40,782 $ 58,543 $ — December 31, 2014 Assets: U.S. government obligations $ 1,290 $ 1,290 $ — $ — Government-sponsored enterprise obligations (a) 1,259 — 1,259 — State and municipal obligations 10,638 — 10,638 — Agency mortgage-backed securities (b) 1,762 — 1,762 — Non-agency mortgage-backed securities 5,635 — 5,635 — Asset-backed securities 5,776 — 5,776 — Corporate bonds (c) 34,264 — 34,264 — Equity securities and mutual funds: (d) U.S. large-cap 20,296 20,296 — — U.S. mid-cap 13,362 13,362 — — U.S. small-cap 3,590 3,590 — — International developed markets 3,377 3,377 — — Emerging markets 473 473 — — Money market funds 3,072 3,072 — — Total $ 104,794 $ 45,460 $ 59,334 $ — (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, consumer goods, healthcare, technology, and manufacturing sectors. 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, 2015 . Under the current policy, the long-term investment target mix for the plan is 35% equity securities and 65% fixed income securities. The Company regularly reviews its policies on investment mix and may make changes depending on economic conditions and perceived investment risk. The discount rate is based on matching the Company's estimated plan cash flows to a yield curve derived from a portfolio of corporate bonds rated AA by either Moody's or Standard and Poor's. The assumed overall expected long-term rate of return on pension plan assets used in calculating 2015 pension plan expense was 6.0% . 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 6.6% . During 2015 , the plan’s rate of return was .6% , compared to 9.1% in 2014 . 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 $1.9 million in 2016 , compared to $1.5 million in 2015 . The increase in expense expected in 2016 as compared to 2015 is primarily due to asset losses that occurred during 2015, partly offset by a higher discount rate and the effect of the new mortality projection scale mentioned below. The Company utilizes published mortality tables to incorporate mortality assumptions into the measurement of the pension benefit obligation. During 2014, the Society of Actuaries published new mortality tables, which incorporate a greater longevity for people living in the United States. The Company utilized the updated mortality tables in measuring the pension benefit obligation as of December 31, 2014, which increased the benefit obligation on that date by $11.4 million . At December 31, 2015, the Company incorporated an updated mortality projection scale published by the Society of Actuaries, which decreased the benefit obligation on that date by $1.8 million . The following future benefit payments are expected to be paid: (In thousands) 2016 $ 6,922 2017 7,102 2018 7,202 2019 7,249 2020 7,419 2021 - 2025 36,940

Stock-Based Compensation and Di

Stock-Based Compensation and Directors Stock Purchase Plan	12 Months Ended
	Dec. 31, 2015
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, 2015 , 3,303,021 shares remained available for issuance under the plan. The stock-based compensation expense that was charged against income was $10.1 million , $8.8 million and $6.4 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The total income tax benefit recognized in the income statement for share-based compensation arrangements was $3.8 million , $3.3 million and $2.4 million for the years ended December 31, 2015 , 2014 and 2013 , 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, 2015 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2015 1,322,502 $ 32.77 Granted 233,654 39.85 Vested (150,196 ) 28.67 Forfeited (21,543 ) 34.37 Nonvested at December 31, 2015 1,384,417 $ 34.38 The total fair value (at vest date) of shares vested during 2015 , 2014 and 2013 was $6.0 million , $4.5 million and $2.1 million , respectively. Stock Appreciation Rights and Stock Options Stock appreciation rights (SARs) and stock options 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 2015 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, 2015 1,869,224 $ 32.34 Granted 252,149 39.43 Forfeited (7,837 ) 37.46 Expired (1,237 ) 35.53 Exercised (523,842 ) 31.44 Outstanding at December 31, 2015 1,588,457 $ 33.74 4.3 years $ 13,978 Exercisable at December 31, 2015 1,078,797 $ 31.56 2.4 years $ 11,845 Vested and expected to vest at December 31, 2015 1,563,538 $ 33.67 4.2 years $ 13,867 Non-qualified stock options were granted in 2005 and prior years, vesting ratably over three years of continuous service with 10 -year contractual terms. The last of these was exercised in 2015, as shown in the summary of stock option activity during 2015 below. Shares Weighted Average Exercise Price Outstanding at January 1, 2015 72,091 $ 27.88 Granted — — Forfeited — — Expired — — Exercised (72,091 ) 27.88 Outstanding, exercisable and vested at December 31, 2015 — $ — In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of options and 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 options and SARs, which represents the period of time that the options and 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. 2015 2014 2013 Weighted per share average fair value at grant date $7.22 $8.40 $6.18 Assumptions: Dividend yield 2.2 % 2.0 % 2.3 % Volatility 21.3 % 22.1 % 23.2 % Risk-free interest rate 1.8 % 2.3 % 1.2 % Expected term 7.2 years 7.1 years 7.3 years Additional information about stock options and SARs exercised is presented below. (In thousands) 2015 2014 2013 Intrinsic value of options and SARs exercised $ 7,541 $ 8,068 $ 6,580 Cash received from options and SARs exercised $ 1,914 $ 8,652 $ 9,426 Tax benefit realized from options and SARs exercised $ 1,041 $ 1,153 $ 335 As of December 31, 2015 , there was $19.9 million of unrecognized compensation cost (net of estimated forfeitures) related to unvested SARs and stock awards. That cost is expected to be recognized over a weighted average period of 2.7 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 106,865 at December 31, 2015 . In 2015 , 23,425 shares were purchased at an average price of $41.60 , and in 2014 , 21,122 shares were purchased at an average price of $40.32 . * All share and per share amounts in this note have been restated for the 5% common stock dividend distributed in 2015 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale 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. The other 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. Unrealized Gains (Losses) on Securities (1) Pension Loss (2) Total Accumulated Other Comprehensive Income (In thousands) OTTI Other Balance January 1, 2015 $ 3,791 $ 81,310 $ (23,008 ) $ 62,093 Other comprehensive income (loss) before reclassifications (1,319 ) (47,907 ) 1,568 (47,658 ) Amounts reclassified from accumulated other comprehensive income 483 (2,926 ) 2,322 (121 ) Current period other comprehensive income (loss), before tax (836 ) (50,833 ) 3,890 (47,779 ) Income tax (expense) benefit 318 19,316 (1,478 ) 18,156 Current period other comprehensive income (loss), net of tax (518 ) (31,517 ) 2,412 (29,623 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 43 (43 ) — — Balance December 31, 2015 $ 3,316 $ 49,750 $ (20,596 ) $ 32,470 Balance January 1, 2014 $ 4,203 $ 21,303 $ (15,775 ) $ 9,731 Other comprehensive income (loss) before reclassifications (2,030 ) 93,158 (15,007 ) 76,121 Amounts reclassified from accumulated other comprehensive income 1,365 3,627 3,341 8,333 Current period other comprehensive income (loss), before tax (665 ) 96,785 (11,666 ) 84,454 Income tax (expense) benefit 253 (36,778 ) 4,433 (32,092 ) Current period other comprehensive income (loss), net of tax (412 ) 60,007 (7,233 ) 52,362 Balance December 31, 2014 $ 3,791 $ 81,310 $ (23,008 ) $ 62,093 (1) The pre-tax amounts reclassified from accumulated other comprehensive income 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 are included in the computation of net periodic pension cost as "amortization of prior service cost, "amortization of unrecognized net loss" and "settlement loss recognized" (see Note 10), for inclusion in the consolidated statements of income.

Segments

Segments	12 Months Ended
	Dec. 31, 2015
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 bank cards. 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 tax planning, advisory and discretionary investment management, and brokerage services, and includes the Private Banking product portfolio. Effective January 1, 2015, certain personal real estate loans, which are held for investment and totaled approximately $340 million , were removed from the Consumer segment. These loans were transferred to the "Other/Elimination" category, outside of segment totals. Management's performance evaluation of the residential mortgage business within the Consumer segment is based on originations and sales of mortgages and the related fees. Information for prior periods presented below have been revised to reflect the transfer of the held for investment loans and their related income and expense, in order to provide comparable data. 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 (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, 2015: Net interest income $ 266,328 $ 296,466 $ 42,653 $ 605,447 $ 28,873 $ 634,320 Provision for loan losses (34,864 ) 1,032 75 (33,757 ) 5,030 (28,727 ) Non-interest income 119,558 194,131 136,374 450,063 (2,508 ) 447,555 Investment securities gains, net — — — — 6,320 6,320 Non-interest expense (273,323 ) (267,521 ) (108,755 ) (649,599 ) (26,304 ) (675,903 ) Income before income taxes $ 77,699 $ 224,108 $ 70,347 $ 372,154 $ 11,411 $ 383,565 Year ended December 31, 2014: Net interest income $ 264,974 $ 287,244 $ 40,128 $ 592,346 $ 27,858 $ 620,204 Provision for loan losses (34,913 ) 559 372 (33,982 ) 4,451 (29,531 ) Non-interest income 113,869 190,538 128,238 432,645 3,333 435,978 Investment securities gains, net — — — — 14,124 14,124 Non-interest expense (263,521 ) (254,121 ) (98,821 ) (616,463 ) (39,879 ) (656,342 ) Income before income taxes $ 80,409 $ 224,220 $ 69,917 $ 374,546 $ 9,887 $ 384,433 Year ended December 31, 2013: Net interest income $ 262,579 $ 280,121 $ 40,185 $ 582,885 $ 36,487 $ 619,372 Provision for loan losses (33,943 ) 3,772 (688 ) (30,859 ) 10,506 (20,353 ) Non-interest income 108,180 186,433 117,322 411,935 6,451 418,386 Investment securities losses, net — — — — (4,425 ) (4,425 ) Non-interest expense (260,336 ) (235,382 ) (96,530 ) (592,248 ) (36,420 ) (628,668 ) Income before income taxes $ 76,480 $ 234,944 $ 60,289 $ 371,713 $ 12,599 $ 384,312 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 2015: Assets $ 2,643,094 $ 7,302,671 $ 1,038,119 $ 10,983,884 $ 12,753,718 $ 23,737,602 Loans, including held for sale 2,500,002 7,125,310 1,029,332 10,654,644 1,218,747 11,873,391 Goodwill and other intangible assets 75,964 69,246 746 145,956 — 145,956 Deposits 9,667,972 7,548,925 2,056,190 19,273,087 52,504 19,325,591 Average balances for 2014: Assets $ 2,519,476 $ 6,966,453 $ 931,397 $ 10,417,326 $ 12,255,597 $ 22,672,923 Loans, including held for sale 2,376,275 6,783,404 922,120 10,081,799 1,178,434 11,260,233 Goodwill and other intangible assets 76,786 69,733 746 147,265 — 147,265 Deposits 9,536,003 7,288,884 1,911,391 18,736,278 59,398 18,795,676 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, 2015
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common and Preferred Stock* On December 14, 2015, the Company distributed a 5% stock dividend on its $5 par common stock for the 22nd consecutive year. All per common share data in this report has been restated to reflect the stock dividend. The Company applies the two-class method of computing income per share, as nonvested share-based awards that pay nonforfeitable common stock dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the following table. Nonvested share-based awards are further discussed in Note 11 on Stock-Based Compensation. Basic income per share is based on the weighted average number of common shares outstanding during the year. Diluted income per share gives effect to all dilutive potential common shares that were outstanding during the year. Presented below is a summary of the components used to calculate basic and diluted income per common share, which have been restated for all stock dividends. (In thousands, except per share data) 2015 2014 2013 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 263,730 $ 261,754 $ 260,961 Less preferred stock dividends 9,000 4,050 — Net income available to common shareholders 254,730 257,704 260,961 Less income allocated to nonvested restricted stock 3,548 3,332 2,939 Net income allocated to common stock $ 251,182 $ 254,372 $ 258,022 Weighted average common shares outstanding 97,974 101,833 104,280 Basic income per common share $ 2.56 $ 2.50 $ 2.47 Diluted income per common share: Net income available to common shareholders $ 254,730 $ 257,704 $ 260,961 Less income allocated to nonvested restricted stock 3,541 3,323 2,931 Net income allocated to common stock $ 251,189 $ 254,381 $ 258,030 Weighted average common shares outstanding 97,974 101,833 104,280 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 305 420 439 Weighted average diluted common shares outstanding 98,279 102,253 104,719 Diluted income per common share $ 2.56 $ 2.49 $ 2.46 Nearly all unexercised stock options and stock appreciation rights were included in the computations of diluted income per share for the years ended 2014 and 2013 . Unexercised options and rights of 402 thousand were excluded from the computation of diluted income per share for the year ended December 31, 2015 because their inclusion would have been anti-dilutive. In June 2014, t he Company issued and sold 6,000,000 depositary shares, 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 net proceeds from the issuance and sale of the Series B Preferred Stock were approximately $144.8 million and were used to fund, in part, an accelerated share repurchase (ASR) program. Under this ASR agreement, the Company paid $200.0 million to Morgan Stanley & Co. LLC (Morgan Stanley) and received from Morgan Stanley 3,368,616 shares of the Company’s common stock in June 2014. Final settlement occurred in June 2015 at which time the remaining shares, totaling 1,554,397 were received by the Company. The specific number of shares that the Company ultimately repurchased was based on the volume-weighted-average price per share of the Company’s common stock during the repurchase period. The Company entered into a second ASR agreement in May 2015, under which it paid $100.0 million to Morgan Stanley and received from Morgan Stanley 1,893,598 shares of common stock at that time. Final settlement occurred in August 2015, at which time the remaining shares, totaling 369,201 , were received by the Company. The Company accounted for repurchases under each ASR agreement as two separate transactions: (i) as shares of common stock acquired in a treasury stock transaction recorded on the acquisition date; and (ii) as a forward contract indexed to the Company’s common stock that is classified as equity and reported as a component of surplus. The shares purchased under the ASR agreements are part of the Company's stock repurchase program, as authorized by its board of directors. The most recent board authorization in October 2015 approved future purchases of 5,000,000 shares of the Company's common stock. At December 31, 2015 , 4,717,944 shares of common stock remained available for purchase under the current board 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) 2015 2014 2013 Shares outstanding at January 1 96,327 95,881 91,414 Issuance of stock: Awards and sales under employee and director plans 435 549 653 5% stock dividend 4,641 4,586 4,565 Summit acquisition — — 1,000 Purchases of treasury stock under accelerated share buyback programs (3,635 ) (3,055 ) — Other purchases of treasury stock (535 ) (1,626 ) (1,742 ) Other (7 ) (8 ) (9 ) Shares outstanding at December 31 97,226 96,327 95,881 * 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 2015 .

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Dec. 31, 2015
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 (under transition provisions, if applicable), 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, 2015 (under Basel III) Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,364,761 13.28 % $ 1,424,764 8.00 % N.A. N.A. Commerce Bank 2,135,668 12.07 1,415,812 8.00 $ 1,769,765 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,196,258 12.33 % $ 1,068,573 6.00 % N.A. N.A. Commerce Bank 1,983,051 11.21 1,061,859 6.00 $ 1,415,812 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,051,474 11.52 % $ 801,430 4.50 % N.A. N.A. Commerce Bank 1,983,051 11.21 796,394 4.50 $ 1,150,347 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,196,258 9.23 % $ 951,370 4.00 % N.A. N.A. Commerce Bank 1,983,051 8.37 948,259 4.00 $ 1,185,324 5.00 % December 31, 2014 (under Basel I) Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,304,206 14.86 % $ 1,240,732 8.00 % N.A. N.A. Commerce Bank 2,026,666 13.16 1,232,378 8.00 $ 1,540,472 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,131,169 13.74 % $ 620,366 4.00 % N.A. N.A. Commerce Bank 1,869,053 12.13 616,189 4.00 $ 924,283 6.00 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,131,169 9.36 % $ 910,977 4.00 % N.A. N.A. Commerce Bank 1,869,053 8.24 907,807 4.00 $ 1,134,759 5.00 % In 2013 and 2014, the U.S. bank regulators approved the final rules implementing the Basel Committee on Banking Supervision's capital adequacy guidelines, which were effective January 1, 2015. Under the final rules, known as Basel III, minimum requirements increased for both the quantity and quality of capital held by the Company. The rules included a new common equity Tier I capital to risk-weighted assets minimum ratio of 4.5% , raised the minimum ratio of Tier I capital to risk-weighted assets from 4.0% to 6.0% , require a minimum ratio of Total capital to risk-weighted assets of 8.0% , and require a minimum Tier 1 leverage ratio of 4.0% . A new capital conservation buffer, comprised of common equity Tier I capital, was also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at .625% of risk-weighted assets and increases each subsequent year by an additional .625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility criteria for regulatory capital instruments were also implemented under the final rules. The phase-in period for the final rules began for the Company on January 1, 2015, with full compliance with all of the final rule's requirements phased in over a multi-year schedule ending January 1, 2019. The Basel III 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. These thresholds were effective January 1, 2015. At December 31, 2015 , the Company met all capital requirements to which it is subject, and the Bank’s capital position exceeded the regulatory definition of well-capitalized.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as available for sale and trading securities, certain non-marketable securities 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, 2015 and 2014 . 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, 2015 Assets: Residential mortgage loans held for sale $ 4,981 $ — $ 4,981 $ — Available for sale securities: U.S. government and federal agency obligations 727,076 727,076 — — Government-sponsored enterprise obligations 793,023 — 793,023 — State and municipal obligations 1,741,957 — 1,724,762 17,195 Agency mortgage-backed securities 2,618,281 — 2,618,281 — Non-agency mortgage-backed securities 879,963 — 879,963 — Asset-backed securities 2,644,381 — 2,644,381 — Other debt securities 331,320 — 331,320 — Equity securities 41,003 20,263 20,740 — Trading securities 11,890 — 11,890 — Private equity investments 63,032 — — 63,032 Derivatives * 12,771 — 12,507 264 Assets held in trust 9,278 9,278 — — Total assets 9,878,956 756,617 9,041,848 80,491 Liabilities: Derivatives * 12,729 — 12,534 195 Total liabilities $ 12,729 $ — $ 12,534 $ 195 December 31, 2014 Assets: Available for sale securities: U.S. government and federal agency obligations $ 501,407 $ 501,407 $ — $ — Government-sponsored enterprise obligations 963,127 — 963,127 — State and municipal obligations 1,813,201 — 1,718,058 95,143 Agency mortgage-backed securities 2,593,708 — 2,593,708 — Non-agency mortgage-backed securities 382,744 — 382,744 — Asset-backed securities 3,091,993 — 3,091,993 — Other debt securities 139,161 — 139,161 — Equity securities 38,219 17,975 20,244 — Trading securities 15,357 — 15,357 — Private equity investments 57,581 — — 57,581 Derivatives * 10,457 — 10,454 3 Assets held in trust 8,848 8,848 — — Total assets 9,615,803 528,230 8,934,846 152,727 Liabilities: Derivatives * 10,948 — 10,722 226 Total liabilities $ 10,948 $ — $ 10,722 $ 226 * 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 investment 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 4 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 equity securities and U.S. Treasury obligations. The fair values of Level 1 and 2 securities (excluding equity 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). • Equity securities 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. The available for sale portfolio includes certain auction rate securities. The auction process by which the auction rate securities are normally priced has not functioned in recent years, and due to the illiquidity in the market, 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. Trading 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 non-marketable 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, 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. These fair value measurements are classified as Level 2. • 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 nonfinancial 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, 2015: Balance at January 1, 2015 $ 95,143 $ 57,581 $ (223 ) $ 152,501 Total gains or losses (realized/unrealized): Included in earnings — 1,402 320 1,722 Included in other comprehensive income 4,169 — — 4,169 Investment securities called (82,825 ) — — (82,825 ) Discount accretion 708 — — 708 Purchases of private equity securities — 13,112 — 13,112 Sale / pay down of private equity securities — (9,204 ) — (9,204 ) Capitalized interest/dividends — 141 — 141 Sale of risk participation agreement — — (28 ) (28 ) Balance at December 31, 2015 $ 17,195 $ 63,032 $ 69 $ 80,296 Total gains or losses for the year months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2015 $ — $ 1,127 $ 322 $ 1,449 Year ended December 31, 2014: Balance at January 1, 2014 $ 127,724 $ 56,612 $ (65 ) $ 184,271 Total gains or losses (realized/unrealized): Included in earnings — 19,137 122 19,259 Included in other comprehensive income 3,638 — — 3,638 Investment securities called (38,225 ) — — (38,225 ) Discount accretion 2,006 — — 2,006 Purchases of private equity securities — 14,152 — 14,152 Sale / pay down of private equity securities — (32,464 ) — (32,464 ) Capitalized interest/dividends — 144 — 144 Purchase of risk participation agreement — — 41 41 Sale of risk participation agreement — — (321 ) (321 ) Balance at December 31, 2014 $ 95,143 $ 57,581 $ (223 ) $ 152,501 Total gains or losses for the year months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2014 $ — $ 718 $ 118 $ 836 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, 2015: Total gains or losses included in earnings $ 263 $ 57 $ 1,402 $ 1,722 Change in unrealized gains or losses relating to assets still held at December 31, 2015 $ 263 $ 59 $ 1,127 $ 1,449 Year ended December 31, 2014: Total gains or losses included in earnings $ — $ 122 $ 19,137 $ 19,259 Change in unrealized gains or losses relating to assets still held at December 31, 2014 $ — $ 118 $ 718 $ 836 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 $17.2 million at December 31, 2015 , while private equity investments, included in non-marketable securities, totaled $63.0 million . Information about these inputs is presented in the table and discussions below. Quantitative Information about Level 3 Fair Value Measurements Weighted Valuation Technique Unobservable Input Range Average Auction rate securities Discounted cash flow Estimated market recovery period 5 years Estimated market rate 3.3% - 3.5% Private equity investments Market comparable companies EBITDA multiple 4.0 - 5.5 Mortgage loan commitments Discounted cash flow Probability of funding 64.1% - 100.0% 80.9% Embedded servicing value .9% - 1.0% 1.0% 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 2015 and 2014 , and still held as of December 31, 2015 and 2014 , 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, 2015 and 2014 . 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, 2015 Collateral dependent impaired loans $ 5,457 $ — $ — $ 5,457 $ (2,464 ) Mortgage servicing rights 1,638 — — 1,638 68 Foreclosed assets 238 — — 238 (108 ) Long-lived assets 822 — — 822 (240 ) Balance at December 31, 2014 Collateral dependent impaired loans $ 11,742 $ — $ — $ 11,742 $ (1,184 ) Private equity investments 984 — — 984 (1,516 ) Mortgage servicing rights 878 — — 878 (13 ) Foreclosed assets 2,540 — — 2,540 (706 ) Long-lived assets 9,895 — — 9,895 (2,327 ) 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, 2015 and 2014 are shown in the table above. Private equity investments and restricted stock These assets are included in non-marketable investment securities in the consolidated balance sheets. They include certain investments in private equity concerns held by the Parent company which are carried at cost, reduced by other-than-temporary impairment. These investments are periodically evaluated for impairment based on their estimated fair value as determined by review of available information, most of which is provided as monthly or quarterly internal financial statements, annual audited financial statements, investee tax returns, and in certain situations, through research into and analysis of the assets and investments held by those private equity concerns. Restricted stock consists of stock issued by the Federal Reserve Bank and FHLB which is held by the bank subsidiary as required for regulatory purposes. Generally, there are restrictions on the sale and/or liquidation of these investments, and they are carried at cost, reduced by other-than-temporary impairment. Fair value measurements for these securities are classified as Level 3. 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, 2015
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, in addition to a discussion of the methods used and assumptions made in computing those estimates, are set forth below. Loans The fair values of loans are estimated by discounting the expected future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining terms. This method of estimating fair value does not incorporate the exit-price concept of fair value prescribed by ASC 820 “Fair Value Measurements and Disclosures”. Future cash flows for each individual loan are modeled using current rates and all contractual features, while adjusting for optionality such as prepayments. Loans with potential optionality are modeled under a multiple-rate path process. Each loan's expected future cash flows are discounted using the LIBOR/swap curve plus an appropriate spread. For business, construction and business real estate loans, internally-developed pricing spreads based on loan type, term and credit score are utilized. The spread for personal real estate loans is generally based on newly originated loans with similar characteristics. For consumer loans, the spread is calculated at loan origination as part of the Bank's funds transfer pricing process, which is indicative of individual borrower creditworthiness. All consumer credit card loans are discounted at the same spread, depending on whether the rate is variable or fixed. Loans Held for Sale, Investment Securities and Derivative Instruments Detailed descriptions of the fair value measurements of these instruments are provided in Note 16 on Fair Value Measurements. Federal Funds Purchased and Sold, Interest Earning Deposits With Banks and Cash and Due From Banks The carrying amounts of federal funds purchased and sold, interest earning deposits with banks, and cash and due from banks approximates fair value, as these instruments are payable on demand or mature overnight. Securities Purchased/Sold under Agreements to Resell/Repurchase The fair values of these investments and borrowings are estimated by discounting contractual cash flows using an estimate of the current market rate for similar instruments. Deposits The fair value of deposits with no stated maturity is equal to the amount payable on demand. Such deposits include savings and interest and non-interest bearing demand deposits. These fair value estimates do not recognize any benefit the Company receives as a result of being able to administer, or control, the pricing of these accounts. Because they are payable on demand, they are classified as Level 1 in the fair value hierarchy. The fair value of time open and certificates of deposit is based on the discounted value of cash flows, taking early withdrawal optionality into account. Discount rates are based on the Company’s approximate cost of obtaining similar maturity funding in the market. Their fair value measurement is classified as Level 3. Other Borrowings The fair value of other borrowings, which consists mainly of long-term debt, is estimated by discounting contractual cash flows using an estimate of the current market rate for similar instruments. The estimated fair values of the Company’s financial instruments are as follows: Fair Value Hierarchy Level 2015 2014 (In thousands) Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Financial Assets Loans: Business Level 3 $ 4,397,893 $ 4,421,237 $ 3,969,952 $ 3,982,531 Real estate - construction and land Level 3 624,070 633,083 403,507 407,905 Real estate - business Level 3 2,355,544 2,387,101 2,288,215 2,315,378 Real estate - personal Level 3 1,915,953 1,940,863 1,883,092 1,933,456 Consumer Level 3 1,924,365 1,916,747 1,705,134 1,701,037 Revolving home equity Level 3 432,981 434,607 430,873 433,508 Consumer credit card Level 3 779,744 793,428 782,370 794,929 Overdrafts Level 3 6,142 6,142 6,095 6,095 Loans held for sale Level 2 7,607 7,607 — — Investment securities: Available for sale Level 1 747,339 747,339 519,382 519,382 Available for sale Level 2 9,012,470 9,012,470 8,909,035 8,909,035 Available for sale Level 3 17,195 17,195 95,143 95,143 Trading Level 2 11,890 11,890 15,357 15,357 Non-marketable Level 3 112,786 112,786 106,875 106,875 Federal funds sold Level 1 14,505 14,505 32,485 32,485 Securities purchased under agreements to resell Level 3 875,000 879,546 1,050,000 1,048,866 Interest earning deposits with banks Level 1 23,803 23,803 600,744 600,744 Cash and due from banks Level 1 464,411 464,411 467,488 467,488 Derivative instruments Level 2 12,507 12,507 10,454 10,454 Derivative instruments Level 3 264 264 3 3 Financial Liabilities Non-interest bearing deposits Level 1 $ 7,146,398 $ 7,146,398 $ 6,811,959 $ 6,811,959 Savings, interest checking and money market deposits Level 1 10,834,746 10,834,746 10,541,601 10,541,601 Time open and certificates of deposit Level 3 1,997,709 1,993,521 2,122,218 2,121,114 Federal funds purchased Level 1 556,970 556,970 3,840 3,840 Securities sold under agreements to repurchase Level 3 1,406,582 1,406,670 1,858,678 1,858,731 Other borrowings Level 3 103,818 108,542 104,058 111,102 Derivative instruments Level 2 12,534 12,534 10,722 10,722 Derivative instruments Level 3 195 195 226 226 Off-Balance Sheet Financial Instruments The fair value of letters of credit and commitments to extend credit is based on the fees currently charged to enter into similar agreements. The aggregate of these fees is not material. These instruments are also referenced in Note 20 on Commitments, Contingencies and Guarantees. Limitations 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.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2015
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. 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) 2015 2014 Interest rate swaps $ 1,020,310 $ 647,709 Interest rate caps 66,118 53,587 Credit risk participation agreements 62,456 75,943 Foreign exchange contracts 15,535 19,791 Mortgage loan commitments 8,605 — Mortgage loan forward sale contracts 642 — Forward TBA contracts 11,000 — Total notional amount $ 1,184,666 $ 797,030 The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. These 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. The banking customer counterparties to interest rate swaps are engaged in a variety of businesses, including real estate, manufacturing, retail product distribution, education, and retirement communities. At December 31, 2015 , the largest loss exposures were in the groups related to real estate, retirement communities, and education. If the counterparties in these groups failed to perform, and if the underlying collateral proved to be of no value, the Company would incur losses of $5.5 million (real estate), $1.4 million (retirement communities), and $1.3 million (education), based on estimated amounts at December 31, 2015 . 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. In addition, the Company uses foreign exchange contracts, to a limited extent, for trading purposes, including taking proprietary positions. 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. The Company’s risks and responsibilities as guarantor are further discussed in Note 20 on Commitments, Contingencies and Guarantees. In 2015, the Company initiated a program of secondary market sales of residential mortgage loans and has designated 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. Derivatives 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. Asset Derivatives Liability Derivatives December 31 December 31 2015 2014 2015 2014 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 11,993 $ 10,144 $ (11,993 ) $ (10,166 ) Interest rate caps 73 62 (73 ) (62 ) Credit risk participation agreements 1 3 (195 ) (226 ) Foreign exchange contracts 437 248 (430 ) (494 ) Mortgage loan commitments 263 — — — Mortgage loan forward sale contracts — — — — Forward TBA contracts 4 — (38 ) — Total $ 12,771 $ 10,457 $ (12,729 ) $ (10,948 ) The effects of derivative instruments on the consolidated statements of income are shown in the table below. 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) 2015 2014 2013 Derivative instruments: Interest rate swaps Other non-interest income $ 4,309 $ 1,674 $ 1,140 Interest rate caps Other non-interest income 32 33 — Credit risk participation agreements Other non-interest income 57 122 234 Foreign exchange contracts: Other non-interest income 253 (263 ) 81 Mortgage loan commitments Loan fees and sales 263 — — Mortgage loan forward sale contracts Loan fees and sales — — — Forward TBA contracts Loan fees and sales 82 — — Total $ 4,996 $ 1,566 $ 1,455 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 balance 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. The Company is party to master netting arrangements with most of its swap derivative counterparties; however, 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 and securities to its clearing agency. At December 31, 2015 , the Company had a net liability position with dealer bank and clearing agency counterparties totaling $11.9 million , and had posted securities with a fair value of $2.4 million and cash totaling $17.9 million . 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, 2015 Assets: Derivatives subject to master netting agreements $ 12,071 $ — $ 12,071 $ (94 ) $ — $ 11,977 Derivatives not subject to master netting agreements 700 — 700 Total derivatives 12,771 — 12,771 Liabilities: Derivatives subject to master netting agreements 12,299 — 12,299 (94 ) (10,927 ) 1,278 Derivatives not subject to master netting agreements 430 — 430 Total derivatives 12,729 — 12,729 December 31, 2014 Assets: Derivatives subject to master netting agreements $ 10,209 $ — $ 10,209 $ (251 ) $ — $ 9,958 Derivatives not subject to master netting agreements 248 — 248 Total derivatives 10,457 — 10,457 Liabilities: Derivatives subject to master netting agreements 10,454 — 10,454 (251 ) (8,738 ) 1,465 Derivatives not subject to master netting agreements 494 — 494 Total derivatives 10,948 — 10,948

Resale and Repurchase Agreement

Resale and Repurchase Agreements (Notes)	12 Months Ended
	Dec. 31, 2015
Offsetting [Abstract]
Balance Sheet Offsetting [Text Block]	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 $550.0 million at December 31, 2015 compared to $450.0 million at December 31, 2014 . At December 31, 2015 , the Company had posted collateral of $565.8 million in marketable securities, consisting mainly of agency mortgage-backed bonds and treasuries, and had accepted $629.6 million in investment grade asset-backed, commercial 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, 2015 Total resale agreements, subject to master netting arrangements $ 1,425,000 $ (550,000 ) $ 875,000 $ — $ (875,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,956,582 (550,000 ) 1,406,582 — (1,406,582 ) — December 31, 2014 Total resale agreements, subject to master netting arrangements $ 1,500,000 $ (450,000 ) $ 1,050,000 $ — $ (1,049,370 ) $ 630 Total repurchase agreements, subject to master netting arrangements 2,308,678 (450,000 ) 1,858,678 — (1,858,678 ) —
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, 2015 , in addition to the various types of marketable securities that have been pledged 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, 2015 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 210,346 $ — $ 300,000 $ 510,346 Government-sponsored enterprise obligations 356,970 — 24,096 381,066 Agency mortgage-backed securities 579,974 2,292 225,904 808,170 Asset-backed securities 212,000 45,000 — 257,000 Total repurchase agreements, gross amount recognized $ 1,359,290 $ 47,292 $ 550,000 $ 1,956,582

Commitments, Contingencies And

Commitments, Contingencies And Guarantees	12 Months Ended
	Dec. 31, 2015
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 $ 6.8 million , $ 6.7 million and $ 6.5 million in 2015 , 2014 and 2013 , respectively. A summary of minimum lease commitments follows: (In thousands) Type of Property Year Ended December 31 Real Property Equipment Total 2016 $ 5,586 $ 47 $ 5,633 2017 4,912 20 4,932 2018 3,931 11 3,942 2019 2,761 — 2,761 2020 1,844 — 1,844 After 13,023 — 13,023 Total minimum lease payments $ 32,135 All leases expire prior to 2052. 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 2016 . 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) 2015 2014 Commitments to extend credit: Credit card $ 4,705,715 $ 3,517,639 Other 5,249,368 4,922,748 Standby letters of credit, net of participations 311,844 324,817 Commercial letters of credit 4,935 7,519 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 3 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, 2015 , the Company had recorded a liability in the amount of $2.8 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 $311.8 million at December 31, 2015 . 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 2015 , purchases and sales of tax credits amounted to $39.3 million and $21.7 million , respectively. At December 31, 2015 , the Company had outstanding purchase commitments totaling $67.4 million that it expects to fund in 2016 . 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, 2015 , believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term, with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 3 to 11 years. At December 31, 2015 , the fair value of the Company's guarantee liability RPAs was $ 195 thousand , and the notional amount of the underlying swaps was $ 58.5 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. On August 15, 2014, a customer filed a purported class action complaint against the Bank in the Circuit Court, Jackson County, Missouri. The case is Cassandra Warren, et al v. Commerce Bank (Case No. 1416-CV19197). In the case, the customer alleges violation of the Missouri usury statute in connection with the Bank charging overdraft fees in connection with point-of-sale/debit and automated-teller machine cards. The case seeks class-action status for Missouri customers of the Bank who may have been similarly affected. The Company believes the complaint lacks merit and will defend itself vigorously. The amount of any ultimate exposure cannot be determined with certainty at this time. The Company has various other lawsuits pending at December 31, 2015 , 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 matters for which it deems a loss is probable and can be reasonably estimated. Some legal matters, which are at early stages in the legal process, 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, 2015
Related Party Transactions [Abstract]
Related Parties	Related Parties The Company’s Chief Executive Officer, its Vice Chairman, and its President are directors of Tower Properties Company (Tower) and, together with members of their immediate families, beneficially own approximately 71% of the outstanding stock of Tower. At December 31, 2015 , Tower owned 245,485 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 four Company-owned office buildings and related parking garages in downtown Kansas City. (In thousands) 2015 2014 2013 Leasing agent fees $ 66 $ 502 $ 50 Operation of parking garages 75 86 84 Building management fees 1,850 1,824 1,799 Property construction management fees 322 335 114 Dividends paid on Company stock held by Tower 210 200 191 Total $ 2,523 $ 2,947 $ 2,238 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 $8.0 million at December 31, 2015 . The maximum borrowings outstanding under this line during 2015 were $1.3 million , and there was no balance outstanding at December 31, 2015 . The maximum borrowings outstanding during 2014 and 2013 were $3.0 million and $2.0 million , and there was $1.3 million balance outstanding at December 31, 2014 . There was no balance outstanding at December 31, 2013 . 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 2015 , 2014 or 2013 , 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 2015 , 2014 and 2013 . Tower leases office space in the Kansas City bank headquarters building owned by the Company. Rent paid to the Company totaled $69 thousand in both 2015 and 2014 and $67 thousand in 2013 , at $15.42 , $15.17 and $14.92 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 2015 , the Company sold state tax credits to its Chief Executive Officer, his father (a former Chief Executive Officer), its Vice Chairman, and its President, in the amount of $478 thousand , $40 thousand , $372 thousand , and $65 thousand , respectively, for personal tax planning. During 2014 , the Company sold state tax credits to its Chief Executive Officer, its Vice Chairman, and its President, in the amount of $396 thousand , $155 thousand , and $60 thousand , respectively. During 2013 , the Company's Chief Executive Officer, his father, its Vice Chairman, and a member of its Board of Directors purchased state tax credits of $846 thousand , $282 thousand , $456 thousand , and $200 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, 2015
Condensed Financial Information of Parent Company Only 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) 2015 2014 Assets Investment in consolidated subsidiaries: Banks $ 2,147,284 $ 2,069,369 Non-banks 50,223 45,600 Cash 53 56 Securities purchased under agreements to resell 104,440 161,650 Investment securities: Available for sale 52,076 52,118 Non-marketable 1,787 1,787 Advances to subsidiaries, net of borrowings 18,560 19,731 Income tax benefits 8,444 3,848 Other assets 17,246 16,551 Total assets $ 2,400,113 $ 2,370,710 Liabilities and stockholders’ equity Pension obligation $ 18,237 $ 20,653 Other liabilities 19,886 19,864 Total liabilities 38,123 40,517 Stockholders’ equity 2,361,990 2,330,193 Total liabilities and stockholders’ equity $ 2,400,113 $ 2,370,710 Condensed Statements of Income For the Years Ended December 31 (In thousands) 2015 2014 2013 Income Dividends received from consolidated subsidiaries: Banks $ 160,001 $ 200,001 $ 200,001 Non-banks — 34,000 390 Earnings of consolidated subsidiaries, net of dividends 106,636 32,493 62,815 Interest and dividends on investment securities 2,272 2,501 4,029 Management fees charged subsidiaries 25,713 25,806 20,701 Investment securities gains — 204 1,294 Other 1,422 2,176 2,958 Total income 296,044 297,181 292,188 Expense Salaries and employee benefits 22,167 26,030 20,433 Professional fees 1,833 2,363 3,538 Data processing fees paid to affiliates 3,186 3,030 2,775 Other 9,265 10,578 10,236 Total expense 36,451 42,001 36,982 Income tax benefit (4,137 ) (6,574 ) (5,755 ) Net income $ 263,730 $ 261,754 $ 260,961 Condensed Statements of Cash Flows For the Years Ended December 31 (In thousands ) 2015 2014 2013 Operating Activities Net income $ 263,730 $ 261,754 $ 260,961 Adjustments to reconcile net income to net cash provided by operating activities: Earnings of consolidated subsidiaries, net of dividends (106,636 ) (32,493 ) (62,815 ) Other adjustments, net (3,284 ) 5,412 (139 ) Net cash provided by operating activities 153,810 234,673 198,007 Investing Activities (Increase) decrease in securities purchased under agreements to resell 57,210 (19,000 ) (74,975 ) (Increase) decrease in investment in subsidiaries, net (6 ) 357 151 Proceeds from sales of investment securities — 157 866 Proceeds from maturities/pay downs of investment securities 3,516 5,852 13,644 Purchases of investment securities (2,500 ) — — (Increase) decrease in advances to subsidiaries, net 1,171 (17,959 ) 3,732 Net purchases of building improvements and equipment (113 ) (98 ) (402 ) Net cash provided by (used in) investing activities 59,278 (30,691 ) (56,984 ) Financing Activities Proceeds from issuance of preferred stock — 144,784 — Purchases of treasury stock (23,176 ) (70,974 ) (69,353 ) Accelerated share repurchase agreements (100,000 ) (200,000 ) — Issuance of stock under equity compensation plans 1,914 8,652 9,426 Excess tax benefit related to equity compensation plans 2,132 1,850 1,003 Cash dividends paid on common stock (84,961 ) (84,241 ) (82,104 ) Cash dividends paid on preferred stock (9,000 ) (4,050 ) — Net cash used in financing activities (213,091 ) (203,979 ) (141,028 ) Increase (decrease) in cash (3 ) 3 (5 ) Cash at beginning of year 56 53 58 Cash at end of year $ 53 $ 56 $ 53 Income tax payments (receipts), net $ 1,278 $ (8,209 ) $ (6,933 ) 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. 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, 2015 , the fair value of available for sale investment securities held by the Parent consisted of investments of $ 40.9 million in common and preferred stock and $ 11.1 million in non-agency mortgage-backed securities. The Parent’s unrealized net gain in fair value on its investments was $ 36.0 million at December 31, 2015 . The corresponding net of tax unrealized gain included in stockholders’ equity was $ 22.3 million . Also included in stockholders’ equity was an unrealized net of tax gain in fair value of investment securities held by subsidiaries, which amounted to $ 30.7 million at December 31, 2015 .

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Nature Of Operations	Nature of Operations Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 350 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.
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 amounts for prior years have been reclassified to conform to the current year presentation. Such reclassifications had no effect on net income or total assets. 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. The enterprise that has a controlling financial interest in a VIE is referred to as the primary beneficiary and consolidates the VIE. 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. 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. This evaluation gives appropriate consideration to the design of the entity and the variability that the entity was designed to pass along, the relative power of each party, and to the Company’s relative obligation to absorb losses or receive residual returns of the entity, in relation to such obligations and rights held by each party. 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. The Company invests in low-income housing partnerships which supply funds for the construction and operation of apartment complexes that provide affordable housing to lower income families. As permitted by ASU 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects," issued by the Financial Accounting Standards Board, the Company adopted a new method of accounting for these investments on January 1, 2015. The new method is the practical expedient to the proportional amortization method, which allows the Company to record the amortization of its investments in income tax expense, rather than in non-interest expense. The Company made this change because it believes that presenting the investment performance net of taxes more fairly represents the economics and returns on such investments. The amortization recognized as a component of income tax expense for the year ended December 31, 2015 was $1.9 million . As required by the ASU, all prior period information in this report has been revised to reflect the adoption, resulting in a decrease to non-interest expense and an increase to income tax expense (as originally reported) of $1.4 million and $965 thousand , respectively, for 2014 and 2013.
Cash And Cash Equivalent	Cash and Cash Equivalents 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. 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, 2015 totaled $84.2 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	Restructured Loans 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, which 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.
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 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 the 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 Company has classified the majority of its investment portfolio 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). Mortgage and asset-backed securities whose credit ratings are below AA at their purchase date are evaluated for OTTI under ASC 325-40-35, which requires evaluations for OTTI at purchase date and in subsequent periods. 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. Premiums and discounts are amortized to interest income over the estimated lives of the 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. Non-marketable securities include certain private equity investments, consisting of both debt and equity instruments. These securities 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 models. Changes in fair value and gains and losses from sales are included in Investment securities gains (losses), net in the consolidated statements of income. Other non-marketable securities acquired for debt and regulatory purposes are accounted for at cost. Trading account securities, which are 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 The Company periodically enters into investments of securities under agreements to resell with large financial institutions. These agreements are accounted for as collateralized financing transactions. Securities pledged by the counterparties to secure these agreements are delivered to a third party custodian. Collateral is valued daily, and the Company may require counterparties to deposit additional collateral, or the Company may return collateral pledged when appropriate to maintain full collateralization for these transactions. 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. 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 straight-line and accelerated methods, utilizing estimated useful lives; generally 30 years for buildings, 10 years for building improvements, and 3 to 8 years for equipment. Leasehold improvements are amortized over the shorter of their estimated useful lives or remaining lease terms. 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. 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, and the assets may be marked down further, reflecting a new cost basis. These valuation adjustments, in addition to gains and losses realized on sales and net operating expenses, are recorded in other non-interest expense.
Intangible Assets	Intangible Assets Goodwill and intangible assets that have indefinite useful lives are not amortized but are reviewed annually for impairment. 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. Goodwill 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. Other intangible assets 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. The Company has not recorded other-than-temporary impairment losses on these 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.
Derivatives	Derivatives As required by current accounting guidance, all derivatives are carried at fair value on the balance sheet. Accounting for changes in the fair value of derivatives (gains and losses) differs depending on whether a qualifying hedge relationship has been designated and on the type of hedge relationship. Derivatives used to hedge the exposure to change in the fair value of an asset, liability, or firm commitment attributable to a particular risk are considered fair value hedges. Under the fair value hedging model, gains or losses attributable to the change in fair value of the derivative, as well as gains and losses attributable to the change in fair value of the hedged item, are recognized in current earnings. Derivatives used to hedge the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Under the cash flow hedging model, the effective portion of the gain or loss related to the derivative is recognized as a component of other comprehensive income and reclassified to earnings in the same period in which the hedged transaction affects earnings. The ineffective portion is recognized in current earnings. At the present time, the Company does not utilize hedge accounting. All of the derivatives currently held by the Company are free-standing instruments, and gains and losses on these derivatives are recognized in current earnings. These 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 recognizing derivatives related to its origination and sales program of certain personal real estate mortgages, which included mortgage loan commitments, forward loan sale contracts, and forward contracts to sell certain to-be-announced (TBA) securities. 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. 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 10, Employee Benefit Plans. 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 fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Company monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated.
Stock-Based Compensation	Stock-Based Compensation The Company’s stock-based employee compensation plan is described in Note 11, Stock-Based Compensation and Directors Stock Purchase Plan. In accordance with the requirements of ASC 718-10-30-3 and 35-2, the Company measures the cost of stock-based compensation based on the grant-date fair value of the award, recognizing the cost over the requisite service period. The fair value of an award is estimated using the Black-Scholes option-pricing model. The expense recognized is based on an estimation of the number of awards for which the requisite service is expected to be rendered and is included in salaries and employee benefits in the accompanying consolidated statements of income.
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 options and 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 restricted share 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 2015 .

Loans And Allowance For Loan 32

Loans And Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Loans And Allowance For Loan Losses [Abstract]
Summary Classification Of Held To Maturity Loan Portfolio	Major classifications within the Company’s held to maturity loan portfolio at December 31, 2015 and 2014 are as follows: (In thousands) 2015 2014 Commercial: Business $ 4,397,893 $ 3,969,952 Real estate — construction and land 624,070 403,507 Real estate — business 2,355,544 2,288,215 Personal Banking: Real estate — personal 1,915,953 1,883,092 Consumer 1,924,365 1,705,134 Revolving home equity 432,981 430,873 Consumer credit card 779,744 782,370 Overdrafts 6,142 6,095 Total loans $ 12,436,692 $ 11,469,238
Loans To Directors And Executive Officers	Loans to directors and executive officers of the Parent and the Bank, and to their associates, are summarized as follows: (In thousands) Balance at January 1, 2015 $ 55,273 Additions 246,475 Amounts collected (250,581 ) Amounts written off — Balance, December 31, 2015 $ 51,167
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, 2012 $ 105,725 $ 66,807 $ 172,532 Provision for loan losses (16,143 ) 36,496 20,353 Deductions: Loans charged off 5,170 49,029 54,199 Less recoveries 9,777 13,069 22,846 Net loans charged off (recoveries) (4,607 ) 35,960 31,353 Balance at December 31, 2013 94,189 67,343 161,532 Provision for loan losses (5,204 ) 34,735 29,531 Deductions: Loans charged off 4,548 48,225 52,773 Less recoveries 5,185 13,057 18,242 Net loans charged off (recoveries) (637 ) 35,168 34,531 Balance at December 31, 2014 89,622 66,910 156,532 Provision for loan losses (9,319 ) 38,046 28,727 Deductions: Loans charged off 4,057 46,993 51,050 Less recoveries 5,840 11,483 17,323 Net loans charged off (recoveries) (1,783 ) 35,510 33,727 Balance at December 31, 2015 $ 82,086 $ 69,446 $ 151,532
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, 2015 and 2014 , 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, 2015 Commercial $ 1,927 $ 43,027 $ 80,159 $ 7,334,480 Personal Banking 1,557 22,287 67,889 5,036,898 Total $ 3,484 $ 65,314 $ 148,048 $ 12,371,378 December 31, 2014 Commercial $ 4,527 $ 55,551 $ 85,095 $ 6,606,123 Personal Banking 2,314 25,537 64,596 4,782,027 Total $ 6,841 $ 81,088 $ 149,691 $ 11,388,150
Investment In Impaired Loans	(In thousands) 2015 2014 Non-accrual loans $ 26,575 $ 40,775 Restructured loans (accruing) 38,739 40,313 Total impaired loans $ 65,314 $ 81,088
Additional Information About Impaired Loans Held	The following table provides additional information about impaired loans held by the Company at December 31, 2015 and 2014 , 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, 2015 With no related allowance recorded: Business $ 9,330 $ 11,777 $ — Real estate – construction and land 2,961 8,956 — Real estate – business 4,793 6,264 — Real estate – personal 373 373 — $ 17,457 $ 27,370 $ — With an allowance recorded: Business $ 18,227 $ 20,031 $ 1,119 Real estate – construction and land 1,227 2,804 63 Real estate – business 6,489 9,008 745 Real estate – personal 7,667 10,530 831 Consumer 5,599 5,599 63 Revolving home equity 704 852 67 Consumer credit card 7,944 7,944 596 $ 47,857 $ 56,768 $ 3,484 Total $ 65,314 $ 84,138 $ 3,484 December 31, 2014 With no related allowance recorded: Business $ 9,237 $ 11,532 $ — Real estate – construction and land 4,552 8,493 — Real estate – business 13,453 17,258 — Revolving home equity 1,227 1,384 — $ 28,469 $ 38,667 $ — With an allowance recorded: Business $ 12,326 $ 13,846 $ 1,844 Real estate – construction and land 8,148 9,610 1,081 Real estate – business 7,835 15,025 1,602 Real estate – personal 9,096 12,465 1,441 Consumer 4,244 4,244 50 Revolving home equity 529 529 9 Consumer credit card 10,441 10,441 814 $ 52,619 $ 66,160 $ 6,841 Total $ 81,088 $ 104,827 $ 6,841
Total Average Impaired Loans	Total average impaired loans during 2015 and 2014 are shown in the table below. 2015 2014 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Average impaired loans: Non-accrual loans $ 24,284 $ 5,449 $ 29,733 $ 38,114 $ 7,132 $ 45,246 Restructured loans (accruing) 16,671 18,395 35,066 33,156 20,040 53,196 Total $ 40,955 $ 23,844 $ 64,799 $ 71,270 $ 27,172 $ 98,442
Interest Income Recognized On Impaired Loans	The table below shows interest income recognized during the years ended December 31, 2015 , 2014 and 2013 for impaired loans held at the end of each respective period. This interest relates to accruing restructured loans, as discussed previously. For the Year Ended December 31 (In thousands) 2015 2014 2013 Interest income recognized on impaired loans: Business $ 495 $ 344 $ 509 Real estate – construction and land 80 361 758 Real estate – business 122 153 215 Real estate – personal 187 208 263 Consumer 348 286 346 Revolving home equity 20 27 36 Consumer credit card 750 993 1,116 Total $ 2,002 $ 2,372 $ 3,243
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, 2015 and 2014 . (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, 2015 Commercial: Business $ 4,384,149 $ 2,306 $ 564 $ 10,874 $ 4,397,893 Real estate – construction and land 617,838 3,142 — 3,090 624,070 Real estate – business 2,340,919 6,762 — 7,863 2,355,544 Personal Banking: Real estate – personal 1,901,330 7,117 3,081 4,425 1,915,953 Consumer 1,903,389 18,273 2,703 — 1,924,365 Revolving home equity 427,998 2,641 2,019 323 432,981 Consumer credit card 762,750 8,894 8,100 — 779,744 Overdrafts 5,834 308 — — 6,142 Total $ 12,344,207 $ 49,443 $ 16,467 $ 26,575 $ 12,436,692 December 31, 2014 Commercial: Business $ 3,946,144 $ 11,152 $ 1,096 $ 11,560 $ 3,969,952 Real estate – construction and land 397,488 827 35 5,157 403,507 Real estate – business 2,266,688 3,661 — 17,866 2,288,215 Personal Banking: Real estate – personal 1,868,606 6,618 1,676 6,192 1,883,092 Consumer 1,687,285 16,053 1,796 — 1,705,134 Revolving home equity 428,478 1,552 843 — 430,873 Consumer credit card 764,599 9,559 8,212 — 782,370 Overdrafts 5,721 374 — — 6,095 Total $ 11,365,009 $ 49,796 $ 13,658 $ 40,775 $ 11,469,238
Credit Quality Of Commercial Loan Portfolio	Commercial Loans (In thousands) Business Real Estate -Construction Real Estate - Business Total December 31, 2015 Pass $ 4,278,857 $ 618,788 $ 2,281,565 $ 7,179,210 Special mention 49,302 1,033 15,009 65,344 Substandard 58,860 1,159 51,107 111,126 Non-accrual 10,874 3,090 7,863 21,827 Total $ 4,397,893 $ 624,070 $ 2,355,544 $ 7,377,507 December 31, 2014 Pass $ 3,871,569 $ 385,831 $ 2,184,541 $ 6,441,941 Special mention 62,904 3,865 40,668 107,437 Substandard 23,919 8,654 45,140 77,713 Non-accrual 11,560 5,157 17,866 34,583 Total $ 3,969,952 $ 403,507 $ 2,288,215 $ 6,661,674
Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding	For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at December 31, 2015 and 2014 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card December 31, 2015 FICO score: Under 600 1.5 % 4.5 % 1.5 % 3.9 % 600 – 659 3.0 9.7 3.9 12.0 660 – 719 9.1 21.8 13.6 31.7 720 – 779 25.0 26.4 28.4 27.9 780 and over 61.4 37.6 52.6 24.5 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2014 FICO score: Under 600 1.4 % 5.2 % 1.8 % 4.1 % 600 – 659 3.1 10.2 4.4 11.8 660 – 719 9.9 22.9 13.7 32.4 720 – 779 26.7 28.0 32.8 27.8 780 and over 58.9 33.7 47.3 23.9 Total 100.0 % 100.0 % 100.0 % 100.0 %
Outstanding Balance Of Loans Classified As Troubled Debt Restructurings	The table below shows the outstanding balance of loans classified as troubled debt restructurings at December 31, 2015 , in addition to the period end balances of 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, 2015 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 26,248 $ — Real estate – construction and land 4,116 1,081 Real estate – business 4,793 — Personal Banking: Real estate – personal 4,547 27 Consumer 5,623 43 Revolving home equity 391 43 Consumer credit card 7,944 586 Total restructured loans $ 53,662 $ 1,780

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities, At Fair Value	Investment securities, at fair value, consisted of the following at December 31, 2015 and 2014 . (In thousands) 2015 2014 Available for sale: U.S. government and federal agency obligations $ 727,076 $ 501,407 Government-sponsored enterprise obligations 793,023 963,127 State and municipal obligations 1,741,957 1,813,201 Agency mortgage-backed securities 2,618,281 2,593,708 Non-agency mortgage-backed securities 879,963 382,744 Asset-backed securities 2,644,381 3,091,993 Other debt securities 331,320 139,161 Equity securities 41,003 38,219 Total available for sale 9,777,004 9,523,560 Trading 11,890 15,357 Non-marketable 112,786 106,875 Total investment securities $ 9,901,680 $ 9,645,792
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 $ 59,506 $ 59,870 1.82*% After 1 but within 5 years 474,370 476,793 1.56* After 5 but within 10 years 143,468 142,759 .63* After 10 years 52,502 47,654 .02* Total U.S. government and federal agency obligations 729,846 727,076 1.29* Government-sponsored enterprise obligations: Within 1 year 15,725 15,818 2.08 After 1 but within 5 years 619,406 618,442 1.62 After 5 but within 10 years 154,151 153,327 2.41 After 10 years 5,630 5,436 2.51 Total government-sponsored enterprise obligations 794,912 793,023 1.79 State and municipal obligations: Within 1 year 105,233 105,507 2.78 After 1 but within 5 years 673,068 688,528 2.40 After 5 but within 10 years 870,631 889,719 2.43 After 10 years 57,703 58,203 3.16 Total state and municipal obligations 1,706,635 1,741,957 2.46 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,579,031 2,618,281 2.62 Non-agency mortgage-backed securities 879,186 879,963 2.54 Asset-backed securities 2,660,201 2,644,381 1.33 Total mortgage and asset-backed securities 6,118,418 6,142,625 2.05 Other debt securities: Within 1 year 9,294 9,359 After 1 but within 5 years 94,871 94,140 After 5 but within 10 years 219,760 216,285 After 10 years 12,000 11,536 Total other debt securities 335,925 331,320 Equity securities 5,678 41,003 Total available for sale investment securities $ 9,691,414 $ 9,777,004
Available For Sale Securities Unrealized Gains And Losses By Security Type	For 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, 2015 U.S. government and federal agency obligations $ 729,846 $ 5,051 $ (7,821 ) $ 727,076 Government-sponsored enterprise obligations 794,912 2,657 (4,546 ) 793,023 State and municipal obligations 1,706,635 37,061 (1,739 ) 1,741,957 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,579,031 47,856 (8,606 ) 2,618,281 Non-agency mortgage-backed securities 879,186 8,596 (7,819 ) 879,963 Asset-backed securities 2,660,201 1,287 (17,107 ) 2,644,381 Total mortgage and asset-backed securities 6,118,418 57,739 (33,532 ) 6,142,625 Other debt securities 335,925 377 (4,982 ) 331,320 Equity securities 5,678 35,325 — 41,003 Total $ 9,691,414 $ 138,210 $ (52,620 ) $ 9,777,004 December 31, 2014 U.S. government and federal agency obligations $ 497,336 $ 9,095 $ (5,024 ) $ 501,407 Government-sponsored enterprise obligations 968,574 2,593 (8,040 ) 963,127 State and municipal obligations 1,789,215 32,340 (8,354 ) 1,813,201 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,523,377 75,923 (5,592 ) 2,593,708 Non-agency mortgage-backed securities 372,911 11,061 (1,228 ) 382,744 Asset-backed securities 3,090,174 6,922 (5,103 ) 3,091,993 Total mortgage and asset-backed securities 5,986,462 93,906 (11,923 ) 6,068,445 Other debt securities 140,784 420 (2,043 ) 139,161 Equity securities 3,931 34,288 — 38,219 Total $ 9,386,302 $ 172,642 $ (35,384 ) $ 9,523,560
Cash Flow Model Inputs Used To Calculate Credit Losses	Significant inputs to the cash flow models used to calculate the credit losses on these securities included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 17% - 53% Credit support 0% - 24% Loss severity 19% - 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) 2015 2014 2013 Cumulative OTTI credit losses at January 1 $ 13,734 $ 12,499 $ 11,306 Credit losses on debt securities for which impairment was not previously recognized 76 — — Credit losses on debt securities for which impairment was previously recognized 407 1,365 1,284 Increase in expected cash flows that are recognized over remaining life of security (88 ) (130 ) (91 ) Cumulative OTTI credit losses at December 31 $ 14,129 $ 13,734 $ 12,499
Securities With Unrealized Losses And Length Of Impairment Period	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, 2015 U.S. government and federal agency obligations $ 491,998 $ 3,098 $ 31,012 $ 4,723 $ 523,010 $ 7,821 Government-sponsored enterprise obligations 157,830 1,975 110,250 2,571 268,080 4,546 State and municipal obligations 66,998 544 31,120 1,195 98,118 1,739 Mortgage and asset-backed securities: Agency mortgage-backed securities 530,035 2,989 291,902 5,617 821,937 8,606 Non-agency mortgage-backed securities 653,603 7,059 54,536 760 708,139 7,819 Asset-backed securities 2,207,922 12,492 223,311 4,615 2,431,233 17,107 Total mortgage and asset-backed securities 3,391,560 22,540 569,749 10,992 3,961,309 33,532 Other debt securities 244,452 3,687 25,218 1,295 269,670 4,982 Total $ 4,352,838 $ 31,844 $ 767,349 $ 20,776 $ 5,120,187 $ 52,620 December 31, 2014 U.S. government and federal agency obligations $ 90,261 $ 818 $ 32,077 $ 4,206 $ 122,338 $ 5,024 Government-sponsored enterprise obligations 224,808 922 224,779 7,118 449,587 8,040 State and municipal obligations 172,980 646 215,702 7,708 388,682 8,354 Mortgage and asset-backed securities: Agency mortgage-backed securities 55,128 429 381,617 5,163 436,745 5,592 Non-agency mortgage-backed securities 141,655 609 43,659 619 185,314 1,228 Asset-backed securities 1,424,457 2,009 159,098 3,094 1,583,555 5,103 Total mortgage and asset-backed securities 1,621,240 3,047 584,374 8,876 2,205,614 11,923 Other debt securities 16,434 55 80,203 1,988 96,637 2,043 Total $ 2,125,723 $ 5,488 $ 1,137,135 $ 29,896 $ 3,262,858 $ 35,384
State And Municipal Obligations, By State And Economic Sector	The portfolio is diversified in order to reduce risk, and the Company has processes and procedures in place to monitor its state and municipal holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner.
Credit Ratings In State And Municipal Bond Portfolio	The credit ratings (Moody’s rating or equivalent) at December 31, 2015 in the state and municipal bond portfolio (excluding auction rate securities) are shown in the following table. The average credit quality of the portfolio is Aa2 as rated by Moody’s. % of Portfolio Aaa 6.7 % Aa 78.0 A 14.6 Not rated .7 100.0 %
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. (In thousands) 2015 2014 2013 Proceeds from sales of available for sale securities $ 675,870 $ 30,998 $ 7,076 Proceeds from sales of non-marketable securities 13,161 33,444 9,223 Total proceeds $ 689,031 $ 64,442 $ 16,299 Available for sale: Gains realized on sales $ 2,925 $ — $ 126 Losses realized on sales — (5,197 ) — Gain realized on donation — 1,570 1,375 Other-than-temporary impairment recognized on debt securities (483 ) (1,365 ) (1,284 ) Non-marketable: Gains realized on sales 2,516 1,629 1,808 Losses realized on sales (40 ) (134 ) (2,979 ) Fair value adjustments, net 1,402 17,621 (3,471 ) Investment securities gains (losses), net $ 6,320 $ 14,124 $ (4,425 )

Land, Buildings And Equipment (

Land, Buildings And Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule Of Land, Buildings And Equipment	Land, buildings and equipment consist of the following at December 31, 2015 and 2014 : (In thousands) 2015 2014 Land $ 105,182 $ 106,599 Buildings and improvements 541,736 535,039 Equipment 250,193 244,239 Total 897,111 885,877 Less accumulated depreciation 544,530 528,006 Net land, buildings and equipment $ 352,581 $ 357,871

Goodwill And Other Intangible35

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 December 31, 2014 ( 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 $ (26,239 ) $ — $ 5,031 $ 31,270 $ (24,698 ) $ — $ 6,572 Mortgage servicing rights 4,638 (2,971 ) (29 ) 1,638 3,693 (2,718 ) (97 ) 878 Total $ 35,908 $ (29,210 ) $ (29 ) $ 6,669 $ 34,963 $ (27,416 ) $ (97 ) $ 7,450
Schedule Of Goodwill Allocated By Operating Segments	The carrying amount of goodwill and its allocation among segments at December 31, 2015 and 2014 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2015 , 2014 or 2013 . Further, the annual assessment of qualitative factors on January 1, 2016 revealed no likelihood of impairment as of that date. (In thousands) December 31, 2015 December 31, 2014 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, 2015 and 2014 are shown in the following table. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance at December 31, 2013 $ 138,921 $ 8,489 $ 779 Originations — — 263 Amortization — (1,917 ) (151 ) Impairment — — (13 ) Balance at December 31, 2014 138,921 6,572 878 Originations — — 945 Amortization — (1,541 ) (253 ) Impairment reversal — — 68 Balance at December 31, 2015 $ 138,921 $ 5,031 $ 1,638
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, 2015 . 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) 2016 $ 1,412 2017 1,068 2018 817 2019 677 2020 553

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Scheduled Maturities Of Total Time Open And Certificates Of Deposit	At December 31, 2015 , the scheduled maturities of total time open and certificates of deposit were as follows: (In thousands) Due in 2016 $ 1,547,305 Due in 2017 212,969 Due in 2018 125,508 Due in 2019 46,533 Due in 2020 61,059 Thereafter 4,335 Total $ 1,997,709
Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category	The following table shows a detailed breakdown of the maturities of time open and certificates of deposit, by size category, at December 31, 2015 . (In thousands) Certificates of Deposit under $100,000 Other Time Deposits under $100,000 Certificates of Deposit over $100,000 Other Time Deposits over $100,000 Total Due in 3 months or less $ 144,126 $ 28,527 $ 317,181 $ 13,995 $ 503,829 Due in over 3 through 6 months 157,787 31,508 338,601 17,505 545,401 Due in over 6 through 12 months 234,347 46,719 182,054 34,955 498,075 Due in over 12 months 83,037 59,140 298,460 9,767 450,404 Total $ 619,297 $ 165,894 $ 1,136,296 $ 76,222 $ 1,997,709

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Short-Term Borrowings	The following table sets forth selected information for short-term borrowings (borrowings with an original maturity of less than one year). (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: 2015 .2 % .1 % $ 1,654,860 $ 2,193,197 $ 1,963,552 2014 .1 .1 1,119,578 1,862,518 1,862,518 2013 .1 .1 914,554 1,479,849 996,558

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 , 2014 and 2013 were as follows: (In thousands) Current Deferred Total Year ended December 31, 2015: U.S. federal $ 102,607 $ 7,084 $ 109,691 State and local 6,551 348 6,899 Total $ 109,158 $ 7,432 $ 116,590 Year ended December 31, 2014: U.S. federal $ 110,552 $ (679 ) $ 109,873 State and local 11,637 139 11,776 Total $ 122,189 $ (540 ) $ 121,649 Year ended December 31, 2013: U.S. federal $ 103,094 $ 7,984 $ 111,078 State and local 10,900 1,217 12,117 Total $ 113,994 $ 9,201 $ 123,195
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, 2015 , 2014 and 2013 were as follows: (In thousands) 2015 2014 2013 Unrealized gain (loss) on securities available for sale $ (19,634 ) $ 36,525 $ (84,582 ) Accumulated pension (benefit) loss 1,478 (4,433 ) 6,981 Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes (2,132 ) (1,850 ) (1,003 ) Income tax (benefit) expense allocated to stockholders’ equity $ (20,288 ) $ 30,242 $ (78,604 )
Components Of Deferred Tax Assets And Liabilities	Significant components of the Company’s deferred tax assets and liabilities at December 31, 2015 and 2014 were as follows: (In thousands) 2015 2014 Deferred tax assets: Loans, principally due to allowance for loan losses $ 60,885 $ 68,014 Accrued expenses 15,080 14,590 Equity-based compensation 12,733 12,689 Private equity investments 8,157 6,001 Deferred compensation 7,751 7,397 Pension 5,078 5,885 Other 5,291 10,172 Total deferred tax assets 114,975 124,748 Deferred tax liabilities: Equipment lease financing 67,938 67,531 Unrealized gain on securities available for sale 32,524 52,158 Land, buildings and equipment 12,186 14,520 Intangibles 7,674 7,532 Accretion on investment securities 5,893 5,919 Other 4,129 3,181 Total deferred tax liabilities 130,344 150,841 Net deferred tax assets (liabilities) $ (15,369 ) $ (26,093 )
Schedule Of Company's Actual Income Tax Expense	A reconciliation between the expected federal income tax expense using the federal statutory tax rate of 35% and the Company’s actual income tax expense for 2015 , 2014 and 2013 is provided in the table below. The effective tax rate is calculated by dividing income taxes by income before income taxes less the non-controlling interest expense. (In thousands) 2015 2014 2013 Computed “expected” tax expense $ 133,112 $ 134,191 $ 134,455 Increase (decrease) in income taxes resulting from: Tax-exempt interest, net of cost to carry (19,083 ) (17,806 ) (16,612 ) State and local income taxes, net of federal tax benefit 4,484 7,655 7,876 Tax deductible dividends on allocated shares held by the Company’s ESOP (1,093 ) (1,116 ) (1,116 ) Other (830 ) (1,275 ) (1,408 ) Total income tax expense $ 116,590 $ 121,649 $ 123,195
Schedule Of Accrued Liability For Unrecognized Tax Benefit	The activity in the accrued liability for unrecognized tax benefits for the years ended December 31, 2015 and 2014 was as follows: (In thousands) 2015 2014 Unrecognized tax benefits at beginning of year $ 1,312 $ 1,428 Gross increases – tax positions in prior period 40 20 Gross decreases – tax positions in prior period — (5 ) Gross increases – current-period tax positions 272 299 Lapse of statute of limitations (346 ) (430 ) Unrecognized tax benefits at end of year $ 1,278 $ 1,312 The Company and its subsidiaries are subject to income tax by federal, state and local government taxing authorities. Tax years 2012 through 2015 remain open to examination for U.S. federal income tax as well as income tax in major state taxing jurisdictions.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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) 2015 2014 2013 Payroll taxes $ 22,235 $ 21,417 $ 21,118 Medical plans 20,659 22,855 18,490 401(k) plan 12,841 12,057 12,465 Pension plans 1,495 2,555 1,627 Other 2,950 2,585 2,988 Total employee benefits $ 60,180 $ 61,469 $ 56,688
Components Of The Net Pension Cost	The following items are components of the net pension cost for the years ended December 31, 2015 , 2014 and 2013 . (In thousands) 2015 2014 2013 Service cost-benefits earned during the year $ 503 $ 430 $ 509 Interest cost on projected benefit obligation 4,762 5,069 4,509 Expected return on plan assets (6,092 ) (6,285 ) (6,476 ) Amortization of prior service cost (271 ) — — Amortization of unrecognized net loss 2,593 1,654 3,085 Settlement loss recognized — 1,687 — Net periodic pension cost $ 1,495 $ 2,555 $ 1,627
Summary Of Pension Plans Funded Status	The following table sets forth the pension plans’ funded status, using valuation dates of December 31, 2015 and 2014 . (In thousands ) 2015 2014 Change in projected benefit obligation Projected benefit obligation at prior valuation date $ 125,447 $ 113,673 Service cost 503 430 Interest cost 4,762 5,069 Plan settlements — (7,163 ) Plan amendments (2,619 ) — Benefits paid (6,400 ) (5,193 ) Actuarial (gain) loss (4,131 ) 18,631 Projected benefit obligation at valuation date 117,562 125,447 Change in plan assets Fair value of plan assets at prior valuation date 104,794 107,172 Actual return on plan assets 911 9,909 Employer contributions 20 69 Plan settlements — (7,163 ) Benefits paid (6,400 ) (5,193 ) Fair value of plan assets at valuation date 99,325 104,794 Funded status and net amount recognized at valuation date $ (18,237 ) $ (20,653 )
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, 2015 and 2014 are shown below, including amounts recognized in other comprehensive income during the periods. All amounts are shown on a pre-tax basis. (In thousands) 2015 2014 Prior service credit $ 2,348 $ — Accumulated loss (35,602 ) (37,145 ) Accumulated other comprehensive loss (33,254 ) (37,145 ) Cumulative employer contributions in excess of net periodic benefit cost 15,017 16,492 Net amount recognized as an accrued benefit liability on the December 31 balance sheet $ (18,237 ) $ (20,653 ) Prior service cost $ 2,618 $ — Net loss arising during period (1,050 ) (15,007 ) Amortization or settlement recognition of net loss 2,593 3,341 Amortization of prior service credit (271 ) — Total recognized in other comprehensive income $ 3,890 $ (11,666 ) Total income (expense) recognized in net periodic pension cost and other comprehensive income $ 2,395 $ (14,221 )
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. 2015 2014 2013 Determination of benefit obligation at year end: Discount rate 4.15 % 3.95 % 4.55 % Assumed credit on cash balance accounts 5.00 % 5.00 % 5.00 % Determination of net periodic benefit cost for year ended: Discount rate 3.95 % 4.55 % 3.65 % Long-term rate of return on assets 6.00 % 6.00 % 6.50 % 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, 2015 and 2014 . 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, 2015 Assets: U.S. government obligations $ 2,540 $ 2,540 $ — $ — Government-sponsored enterprise obligations (a) 1,208 — 1,208 — State and municipal obligations 10,478 — 10,478 — Agency mortgage-backed securities (b) 1,352 — 1,352 — Non-agency mortgage-backed securities 5,740 — 5,740 — Asset-backed securities 6,965 — 6,965 — Corporate bonds (c) 32,800 — 32,800 — Equity securities and mutual funds: (d) U.S. large-cap 15,746 15,746 — — U.S. mid-cap 12,960 12,960 — — U.S. small-cap 2,545 2,545 — — International developed markets 3,125 3,125 — — Emerging markets 392 392 — — Money market funds 3,474 3,474 — — Total $ 99,325 $ 40,782 $ 58,543 $ — December 31, 2014 Assets: U.S. government obligations $ 1,290 $ 1,290 $ — $ — Government-sponsored enterprise obligations (a) 1,259 — 1,259 — State and municipal obligations 10,638 — 10,638 — Agency mortgage-backed securities (b) 1,762 — 1,762 — Non-agency mortgage-backed securities 5,635 — 5,635 — Asset-backed securities 5,776 — 5,776 — Corporate bonds (c) 34,264 — 34,264 — Equity securities and mutual funds: (d) U.S. large-cap 20,296 20,296 — — U.S. mid-cap 13,362 13,362 — — U.S. small-cap 3,590 3,590 — — International developed markets 3,377 3,377 — — Emerging markets 473 473 — — Money market funds 3,072 3,072 — — Total $ 104,794 $ 45,460 $ 59,334 $ — (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, consumer goods, healthcare, technology, and manufacturing sectors.
Future Benefit Payments	The following future benefit payments are expected to be paid: (In thousands) 2016 $ 6,922 2017 7,102 2018 7,202 2019 7,249 2020 7,419 2021 - 2025 36,940

Stock-Based Compensation and 40

Stock-Based Compensation and Directors Stock Purchase Plan (Tables)	12 Months Ended
	Dec. 31, 2015
Share-based Compensation [Abstract]
Summary Of The Status Of Nonvested Share Awards	A summary of the status of the Company’s nonvested share awards as of December 31, 2015 and changes during the year then ended is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2015 1,322,502 $ 32.77 Granted 233,654 39.85 Vested (150,196 ) 28.67 Forfeited (21,543 ) 34.37 Nonvested at December 31, 2015 1,384,417 $ 34.38
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]	2015 2014 2013 Weighted per share average fair value at grant date $7.22 $8.40 $6.18 Assumptions: Dividend yield 2.2 % 2.0 % 2.3 % Volatility 21.3 % 22.1 % 23.2 % Risk-free interest rate 1.8 % 2.3 % 1.2 % Expected term 7.2 years 7.1 years 7.3 years
Summary Of Option Activity	summary of stock option activity during 2015 below. Shares Weighted Average Exercise Price Outstanding at January 1, 2015 72,091 $ 27.88 Granted — — Forfeited — — Expired — — Exercised (72,091 ) 27.88 Outstanding, exercisable and vested at December 31, 2015 — $ —
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, 2015 1,869,224 $ 32.34 Granted 252,149 39.43 Forfeited (7,837 ) 37.46 Expired (1,237 ) 35.53 Exercised (523,842 ) 31.44 Outstanding at December 31, 2015 1,588,457 $ 33.74 4.3 years $ 13,978 Exercisable at December 31, 2015 1,078,797 $ 31.56 2.4 years $ 11,845 Vested and expected to vest at December 31, 2015 1,563,538 $ 33.67 4.2 years $ 13,867
Schedule Of Additional Information About Stock Options and SARs Exercises	Additional information about stock options and SARs exercised is presented below. (In thousands) 2015 2014 2013 Intrinsic value of options and SARs exercised $ 7,541 $ 8,068 $ 6,580 Cash received from options and SARs exercised $ 1,914 $ 8,652 $ 9,426 Tax benefit realized from options and SARs exercised $ 1,041 $ 1,153 $ 335

Accumulated Other Comprehensi41

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components Of Accumulated Other Comprehensive Income (Loss)	Unrealized Gains (Losses) on Securities (1) Pension Loss (2) Total Accumulated Other Comprehensive Income (In thousands) OTTI Other Balance January 1, 2015 $ 3,791 $ 81,310 $ (23,008 ) $ 62,093 Other comprehensive income (loss) before reclassifications (1,319 ) (47,907 ) 1,568 (47,658 ) Amounts reclassified from accumulated other comprehensive income 483 (2,926 ) 2,322 (121 ) Current period other comprehensive income (loss), before tax (836 ) (50,833 ) 3,890 (47,779 ) Income tax (expense) benefit 318 19,316 (1,478 ) 18,156 Current period other comprehensive income (loss), net of tax (518 ) (31,517 ) 2,412 (29,623 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 43 (43 ) — — Balance December 31, 2015 $ 3,316 $ 49,750 $ (20,596 ) $ 32,470 Balance January 1, 2014 $ 4,203 $ 21,303 $ (15,775 ) $ 9,731 Other comprehensive income (loss) before reclassifications (2,030 ) 93,158 (15,007 ) 76,121 Amounts reclassified from accumulated other comprehensive income 1,365 3,627 3,341 8,333 Current period other comprehensive income (loss), before tax (665 ) 96,785 (11,666 ) 84,454 Income tax (expense) benefit 253 (36,778 ) 4,433 (32,092 ) Current period other comprehensive income (loss), net of tax (412 ) 60,007 (7,233 ) 52,362 Balance December 31, 2014 $ 3,791 $ 81,310 $ (23,008 ) $ 62,093 (1) The pre-tax amounts reclassified from accumulated other comprehensive income 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 are included in the computation of net periodic pension cost as "amortization of prior service cost, "amortization of unrecognized net loss" and "settlement loss recognized" (see Note 10), for inclusion in the consolidated statements of income.

Segments (Tables)

Segments (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015: Net interest income $ 266,328 $ 296,466 $ 42,653 $ 605,447 $ 28,873 $ 634,320 Provision for loan losses (34,864 ) 1,032 75 (33,757 ) 5,030 (28,727 ) Non-interest income 119,558 194,131 136,374 450,063 (2,508 ) 447,555 Investment securities gains, net — — — — 6,320 6,320 Non-interest expense (273,323 ) (267,521 ) (108,755 ) (649,599 ) (26,304 ) (675,903 ) Income before income taxes $ 77,699 $ 224,108 $ 70,347 $ 372,154 $ 11,411 $ 383,565 Year ended December 31, 2014: Net interest income $ 264,974 $ 287,244 $ 40,128 $ 592,346 $ 27,858 $ 620,204 Provision for loan losses (34,913 ) 559 372 (33,982 ) 4,451 (29,531 ) Non-interest income 113,869 190,538 128,238 432,645 3,333 435,978 Investment securities gains, net — — — — 14,124 14,124 Non-interest expense (263,521 ) (254,121 ) (98,821 ) (616,463 ) (39,879 ) (656,342 ) Income before income taxes $ 80,409 $ 224,220 $ 69,917 $ 374,546 $ 9,887 $ 384,433 Year ended December 31, 2013: Net interest income $ 262,579 $ 280,121 $ 40,185 $ 582,885 $ 36,487 $ 619,372 Provision for loan losses (33,943 ) 3,772 (688 ) (30,859 ) 10,506 (20,353 ) Non-interest income 108,180 186,433 117,322 411,935 6,451 418,386 Investment securities losses, net — — — — (4,425 ) (4,425 ) Non-interest expense (260,336 ) (235,382 ) (96,530 ) (592,248 ) (36,420 ) (628,668 ) Income before income taxes $ 76,480 $ 234,944 $ 60,289 $ 371,713 $ 12,599 $ 384,312
Segment Balance Sheet Data	Segment Balance Sheet Data (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Average balances for 2015: Assets $ 2,643,094 $ 7,302,671 $ 1,038,119 $ 10,983,884 $ 12,753,718 $ 23,737,602 Loans, including held for sale 2,500,002 7,125,310 1,029,332 10,654,644 1,218,747 11,873,391 Goodwill and other intangible assets 75,964 69,246 746 145,956 — 145,956 Deposits 9,667,972 7,548,925 2,056,190 19,273,087 52,504 19,325,591 Average balances for 2014: Assets $ 2,519,476 $ 6,966,453 $ 931,397 $ 10,417,326 $ 12,255,597 $ 22,672,923 Loans, including held for sale 2,376,275 6,783,404 922,120 10,081,799 1,178,434 11,260,233 Goodwill and other intangible assets 76,786 69,733 746 147,265 — 147,265 Deposits 9,536,003 7,288,884 1,911,391 18,736,278 59,398 18,795,676

Common and Preferred Stock (Tab

Common and Preferred Stock (Tables)	12 Months Ended
	Dec. 31, 2015
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) 2015 2014 2013 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 263,730 $ 261,754 $ 260,961 Less preferred stock dividends 9,000 4,050 — Net income available to common shareholders 254,730 257,704 260,961 Less income allocated to nonvested restricted stock 3,548 3,332 2,939 Net income allocated to common stock $ 251,182 $ 254,372 $ 258,022 Weighted average common shares outstanding 97,974 101,833 104,280 Basic income per common share $ 2.56 $ 2.50 $ 2.47 Diluted income per common share: Net income available to common shareholders $ 254,730 $ 257,704 $ 260,961 Less income allocated to nonvested restricted stock 3,541 3,323 2,931 Net income allocated to common stock $ 251,189 $ 254,381 $ 258,030 Weighted average common shares outstanding 97,974 101,833 104,280 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 305 420 439 Weighted average diluted common shares outstanding 98,279 102,253 104,719 Diluted income per common share $ 2.56 $ 2.49 $ 2.46
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) 2015 2014 2013 Shares outstanding at January 1 96,327 95,881 91,414 Issuance of stock: Awards and sales under employee and director plans 435 549 653 5% stock dividend 4,641 4,586 4,565 Summit acquisition — — 1,000 Purchases of treasury stock under accelerated share buyback programs (3,635 ) (3,055 ) — Other purchases of treasury stock (535 ) (1,626 ) (1,742 ) Other (7 ) (8 ) (9 ) Shares outstanding at December 31 97,226 96,327 95,881

Regulatory Capital Requiremen44

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2015
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 (under transition provisions, if applicable), 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, 2015 (under Basel III) Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,364,761 13.28 % $ 1,424,764 8.00 % N.A. N.A. Commerce Bank 2,135,668 12.07 1,415,812 8.00 $ 1,769,765 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,196,258 12.33 % $ 1,068,573 6.00 % N.A. N.A. Commerce Bank 1,983,051 11.21 1,061,859 6.00 $ 1,415,812 8.00 % Tier I Common Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,051,474 11.52 % $ 801,430 4.50 % N.A. N.A. Commerce Bank 1,983,051 11.21 796,394 4.50 $ 1,150,347 6.50 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,196,258 9.23 % $ 951,370 4.00 % N.A. N.A. Commerce Bank 1,983,051 8.37 948,259 4.00 $ 1,185,324 5.00 % December 31, 2014 (under Basel I) Total Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,304,206 14.86 % $ 1,240,732 8.00 % N.A. N.A. Commerce Bank 2,026,666 13.16 1,232,378 8.00 $ 1,540,472 10.00 % Tier I Capital (to risk-weighted assets): Commerce Bancshares, Inc. (consolidated) $ 2,131,169 13.74 % $ 620,366 4.00 % N.A. N.A. Commerce Bank 1,869,053 12.13 616,189 4.00 $ 924,283 6.00 % Tier I Capital (to adjusted quarterly average assets): (Leverage Ratio) Commerce Bancshares, Inc. (consolidated) $ 2,131,169 9.36 % $ 910,977 4.00 % N.A. N.A. Commerce Bank 1,869,053 8.24 907,807 4.00 $ 1,134,759 5.00 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 and 2014 . 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, 2015 Assets: Residential mortgage loans held for sale $ 4,981 $ — $ 4,981 $ — Available for sale securities: U.S. government and federal agency obligations 727,076 727,076 — — Government-sponsored enterprise obligations 793,023 — 793,023 — State and municipal obligations 1,741,957 — 1,724,762 17,195 Agency mortgage-backed securities 2,618,281 — 2,618,281 — Non-agency mortgage-backed securities 879,963 — 879,963 — Asset-backed securities 2,644,381 — 2,644,381 — Other debt securities 331,320 — 331,320 — Equity securities 41,003 20,263 20,740 — Trading securities 11,890 — 11,890 — Private equity investments 63,032 — — 63,032 Derivatives * 12,771 — 12,507 264 Assets held in trust 9,278 9,278 — — Total assets 9,878,956 756,617 9,041,848 80,491 Liabilities: Derivatives * 12,729 — 12,534 195 Total liabilities $ 12,729 $ — $ 12,534 $ 195 December 31, 2014 Assets: Available for sale securities: U.S. government and federal agency obligations $ 501,407 $ 501,407 $ — $ — Government-sponsored enterprise obligations 963,127 — 963,127 — State and municipal obligations 1,813,201 — 1,718,058 95,143 Agency mortgage-backed securities 2,593,708 — 2,593,708 — Non-agency mortgage-backed securities 382,744 — 382,744 — Asset-backed securities 3,091,993 — 3,091,993 — Other debt securities 139,161 — 139,161 — Equity securities 38,219 17,975 20,244 — Trading securities 15,357 — 15,357 — Private equity investments 57,581 — — 57,581 Derivatives * 10,457 — 10,454 3 Assets held in trust 8,848 8,848 — — Total assets 9,615,803 528,230 8,934,846 152,727 Liabilities: Derivatives * 10,948 — 10,722 226 Total liabilities $ 10,948 $ — $ 10,722 $ 226 * 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	he 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, 2015: Balance at January 1, 2015 $ 95,143 $ 57,581 $ (223 ) $ 152,501 Total gains or losses (realized/unrealized): Included in earnings — 1,402 320 1,722 Included in other comprehensive income 4,169 — — 4,169 Investment securities called (82,825 ) — — (82,825 ) Discount accretion 708 — — 708 Purchases of private equity securities — 13,112 — 13,112 Sale / pay down of private equity securities — (9,204 ) — (9,204 ) Capitalized interest/dividends — 141 — 141 Sale of risk participation agreement — — (28 ) (28 ) Balance at December 31, 2015 $ 17,195 $ 63,032 $ 69 $ 80,296 Total gains or losses for the year months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2015 $ — $ 1,127 $ 322 $ 1,449 Year ended December 31, 2014: Balance at January 1, 2014 $ 127,724 $ 56,612 $ (65 ) $ 184,271 Total gains or losses (realized/unrealized): Included in earnings — 19,137 122 19,259 Included in other comprehensive income 3,638 — — 3,638 Investment securities called (38,225 ) — — (38,225 ) Discount accretion 2,006 — — 2,006 Purchases of private equity securities — 14,152 — 14,152 Sale / pay down of private equity securities — (32,464 ) — (32,464 ) Capitalized interest/dividends — 144 — 144 Purchase of risk participation agreement — — 41 41 Sale of risk participation agreement — — (321 ) (321 ) Balance at December 31, 2014 $ 95,143 $ 57,581 $ (223 ) $ 152,501 Total gains or losses for the year months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2014 $ — $ 718 $ 118 $ 836
Summary Of Gains And Losses On Level 3 Assets And Liabilities	ains 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, 2015: Total gains or losses included in earnings $ 263 $ 57 $ 1,402 $ 1,722 Change in unrealized gains or losses relating to assets still held at December 31, 2015 $ 263 $ 59 $ 1,127 $ 1,449 Year ended December 31, 2014: Total gains or losses included in earnings $ — $ 122 $ 19,137 $ 19,259 Change in unrealized gains or losses relating to assets still held at December 31, 2014 $ — $ 118 $ 718 $ 836
Summary Of Quantitative Information About Level 3 Fair Value Measurements	nformation about these inputs is presented in the table and discussions below. Quantitative Information about Level 3 Fair Value Measurements Weighted Valuation Technique Unobservable Input Range Average Auction rate securities Discounted cash flow Estimated market recovery period 5 years Estimated market rate 3.3% - 3.5% Private equity investments Market comparable companies EBITDA multiple 4.0 - 5.5 Mortgage loan commitments Discounted cash flow Probability of funding 64.1% - 100.0% 80.9% Embedded servicing value .9% - 1.0% 1.0%
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]	or assets measured at fair value on a nonrecurring basis during 2015 and 2014 , and still held as of December 31, 2015 and 2014 , 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, 2015 and 2014 . 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, 2015 Collateral dependent impaired loans $ 5,457 $ — $ — $ 5,457 $ (2,464 ) Mortgage servicing rights 1,638 — — 1,638 68 Foreclosed assets 238 — — 238 (108 ) Long-lived assets 822 — — 822 (240 ) Balance at December 31, 2014 Collateral dependent impaired loans $ 11,742 $ — $ — $ 11,742 $ (1,184 ) Private equity investments 984 — — 984 (1,516 ) Mortgage servicing rights 878 — — 878 (13 ) Foreclosed assets 2,540 — — 2,540 (706 ) Long-lived assets 9,895 — — 9,895 (2,327 )

Fair Value Of Financial Instr46

Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Schedule Of Estimated Fair Value Of Financial Instruments	The estimated fair values of the Company’s financial instruments are as follows: Fair Value Hierarchy Level 2015 2014 (In thousands) Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Financial Assets Loans: Business Level 3 $ 4,397,893 $ 4,421,237 $ 3,969,952 $ 3,982,531 Real estate - construction and land Level 3 624,070 633,083 403,507 407,905 Real estate - business Level 3 2,355,544 2,387,101 2,288,215 2,315,378 Real estate - personal Level 3 1,915,953 1,940,863 1,883,092 1,933,456 Consumer Level 3 1,924,365 1,916,747 1,705,134 1,701,037 Revolving home equity Level 3 432,981 434,607 430,873 433,508 Consumer credit card Level 3 779,744 793,428 782,370 794,929 Overdrafts Level 3 6,142 6,142 6,095 6,095 Loans held for sale Level 2 7,607 7,607 — — Investment securities: Available for sale Level 1 747,339 747,339 519,382 519,382 Available for sale Level 2 9,012,470 9,012,470 8,909,035 8,909,035 Available for sale Level 3 17,195 17,195 95,143 95,143 Trading Level 2 11,890 11,890 15,357 15,357 Non-marketable Level 3 112,786 112,786 106,875 106,875 Federal funds sold Level 1 14,505 14,505 32,485 32,485 Securities purchased under agreements to resell Level 3 875,000 879,546 1,050,000 1,048,866 Interest earning deposits with banks Level 1 23,803 23,803 600,744 600,744 Cash and due from banks Level 1 464,411 464,411 467,488 467,488 Derivative instruments Level 2 12,507 12,507 10,454 10,454 Derivative instruments Level 3 264 264 3 3 Financial Liabilities Non-interest bearing deposits Level 1 $ 7,146,398 $ 7,146,398 $ 6,811,959 $ 6,811,959 Savings, interest checking and money market deposits Level 1 10,834,746 10,834,746 10,541,601 10,541,601 Time open and certificates of deposit Level 3 1,997,709 1,993,521 2,122,218 2,121,114 Federal funds purchased Level 1 556,970 556,970 3,840 3,840 Securities sold under agreements to repurchase Level 3 1,406,582 1,406,670 1,858,678 1,858,731 Other borrowings Level 3 103,818 108,542 104,058 111,102 Derivative instruments Level 2 12,534 12,534 10,722 10,722 Derivative instruments Level 3 195 195 226 226

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative Instrument Detail [Abstract]
Schedule Of Notional Amounts Of Derivative Instruments	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) 2015 2014 Interest rate swaps $ 1,020,310 $ 647,709 Interest rate caps 66,118 53,587 Credit risk participation agreements 62,456 75,943 Foreign exchange contracts 15,535 19,791 Mortgage loan commitments 8,605 — Mortgage loan forward sale contracts 642 — Forward TBA contracts 11,000 — Total notional amount $ 1,184,666 $ 797,030
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. Derivatives 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. Asset Derivatives Liability Derivatives December 31 December 31 2015 2014 2015 2014 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 11,993 $ 10,144 $ (11,993 ) $ (10,166 ) Interest rate caps 73 62 (73 ) (62 ) Credit risk participation agreements 1 3 (195 ) (226 ) Foreign exchange contracts 437 248 (430 ) (494 ) Mortgage loan commitments 263 — — — Mortgage loan forward sale contracts — — — — Forward TBA contracts 4 — (38 ) — Total $ 12,771 $ 10,457 $ (12,729 ) $ (10,948 )
Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income	The effects of derivative instruments on the consolidated statements of income are shown in the table below. 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) 2015 2014 2013 Derivative instruments: Interest rate swaps Other non-interest income $ 4,309 $ 1,674 $ 1,140 Interest rate caps Other non-interest income 32 33 — Credit risk participation agreements Other non-interest income 57 122 234 Foreign exchange contracts: Other non-interest income 253 (263 ) 81 Mortgage loan commitments Loan fees and sales 263 — — Mortgage loan forward sale contracts Loan fees and sales — — — Forward TBA contracts Loan fees and sales 82 — — Total $ 4,996 $ 1,566 $ 1,455 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 balance 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. The Company is party to master netting arrangements with most of its swap derivative counterparties; however, 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 and securities to its clearing agency. At December 31, 2015 , the Company had a net liability position with dealer bank and clearing agency counterparties totaling $11.9 million , and had posted securities with a fair value of $2.4 million and cash totaling $17.9 million . 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.
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, 2015 Assets: Derivatives subject to master netting agreements $ 12,071 $ — $ 12,071 $ (94 ) $ — $ 11,977 Derivatives not subject to master netting agreements 700 — 700 Total derivatives 12,771 — 12,771 Liabilities: Derivatives subject to master netting agreements 12,299 — 12,299 (94 ) (10,927 ) 1,278 Derivatives not subject to master netting agreements 430 — 430 Total derivatives 12,729 — 12,729 December 31, 2014 Assets: Derivatives subject to master netting agreements $ 10,209 $ — $ 10,209 $ (251 ) $ — $ 9,958 Derivatives not subject to master netting agreements 248 — 248 Total derivatives 10,457 — 10,457 Liabilities: Derivatives subject to master netting agreements 10,454 — 10,454 (251 ) (8,738 ) 1,465 Derivatives not subject to master netting agreements 494 — 494 Total derivatives 10,948 — 10,948

Commitments, Contingencies An48

Commitments, Contingencies And Guarantees (Tables)	12 Months Ended
	Dec. 31, 2015
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 2016 $ 5,586 $ 47 $ 5,633 2017 4,912 20 4,932 2018 3,931 11 3,942 2019 2,761 — 2,761 2020 1,844 — 1,844 After 13,023 — 13,023 Total minimum lease payments $ 32,135
Schedule Of Off-Balance Sheet Instruments Commitments	The following table summarizes these commitments at December 31: (In thousands) 2015 2014 Commitments to extend credit: Credit card $ 4,705,715 $ 3,517,639 Other 5,249,368 4,922,748 Standby letters of credit, net of participations 311,844 324,817 Commercial letters of credit 4,935 7,519

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Schedule Of Related Party Expenses	(In thousands) 2015 2014 2013 Leasing agent fees $ 66 $ 502 $ 50 Operation of parking garages 75 86 84 Building management fees 1,850 1,824 1,799 Property construction management fees 322 335 114 Dividends paid on Company stock held by Tower 210 200 191 Total $ 2,523 $ 2,947 $ 2,238

Parent Company Condensed Fina50

Parent Company Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets	Condensed Balance Sheets December 31 (In thousands) 2015 2014 Assets Investment in consolidated subsidiaries: Banks $ 2,147,284 $ 2,069,369 Non-banks 50,223 45,600 Cash 53 56 Securities purchased under agreements to resell 104,440 161,650 Investment securities: Available for sale 52,076 52,118 Non-marketable 1,787 1,787 Advances to subsidiaries, net of borrowings 18,560 19,731 Income tax benefits 8,444 3,848 Other assets 17,246 16,551 Total assets $ 2,400,113 $ 2,370,710 Liabilities and stockholders’ equity Pension obligation $ 18,237 $ 20,653 Other liabilities 19,886 19,864 Total liabilities 38,123 40,517 Stockholders’ equity 2,361,990 2,330,193 Total liabilities and stockholders’ equity $ 2,400,113 $ 2,370,710
Condensed Statements Of Income	Condensed Statements of Income For the Years Ended December 31 (In thousands) 2015 2014 2013 Income Dividends received from consolidated subsidiaries: Banks $ 160,001 $ 200,001 $ 200,001 Non-banks — 34,000 390 Earnings of consolidated subsidiaries, net of dividends 106,636 32,493 62,815 Interest and dividends on investment securities 2,272 2,501 4,029 Management fees charged subsidiaries 25,713 25,806 20,701 Investment securities gains — 204 1,294 Other 1,422 2,176 2,958 Total income 296,044 297,181 292,188 Expense Salaries and employee benefits 22,167 26,030 20,433 Professional fees 1,833 2,363 3,538 Data processing fees paid to affiliates 3,186 3,030 2,775 Other 9,265 10,578 10,236 Total expense 36,451 42,001 36,982 Income tax benefit (4,137 ) (6,574 ) (5,755 ) Net income $ 263,730 $ 261,754 $ 260,961
Condensed Statements Of Cash Flows	Condensed Statements of Cash Flows For the Years Ended December 31 (In thousands ) 2015 2014 2013 Operating Activities Net income $ 263,730 $ 261,754 $ 260,961 Adjustments to reconcile net income to net cash provided by operating activities: Earnings of consolidated subsidiaries, net of dividends (106,636 ) (32,493 ) (62,815 ) Other adjustments, net (3,284 ) 5,412 (139 ) Net cash provided by operating activities 153,810 234,673 198,007 Investing Activities (Increase) decrease in securities purchased under agreements to resell 57,210 (19,000 ) (74,975 ) (Increase) decrease in investment in subsidiaries, net (6 ) 357 151 Proceeds from sales of investment securities — 157 866 Proceeds from maturities/pay downs of investment securities 3,516 5,852 13,644 Purchases of investment securities (2,500 ) — — (Increase) decrease in advances to subsidiaries, net 1,171 (17,959 ) 3,732 Net purchases of building improvements and equipment (113 ) (98 ) (402 ) Net cash provided by (used in) investing activities 59,278 (30,691 ) (56,984 ) Financing Activities Proceeds from issuance of preferred stock — 144,784 — Purchases of treasury stock (23,176 ) (70,974 ) (69,353 ) Accelerated share repurchase agreements (100,000 ) (200,000 ) — Issuance of stock under equity compensation plans 1,914 8,652 9,426 Excess tax benefit related to equity compensation plans 2,132 1,850 1,003 Cash dividends paid on common stock (84,961 ) (84,241 ) (82,104 ) Cash dividends paid on preferred stock (9,000 ) (4,050 ) — Net cash used in financing activities (213,091 ) (203,979 ) (141,028 ) Increase (decrease) in cash (3 ) 3 (5 ) Cash at beginning of year 56 53 58 Cash at end of year $ 53 $ 56 $ 53 Income tax payments (receipts), net $ 1,278 $ (8,209 ) $ (6,933 )

Summary of Significant Accoun51

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015
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	8 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 Accoun52

Summary of Significant Accounting Policies Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Locations	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Accounting Policies [Abstract]
Locations | Locations	350
Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 1,900	$ 1,400	$ 965
Federal Reserve Bank Reserve Requirement	$ 84,200
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%

Acquisitions and Dispositions A

Acquisitions and Dispositions Acquisitions (Details)	Sep. 02, 2013USD ($)Locations	Dec. 31, 2015USD ($)Locations
Locations | Locations		350
Summit Acquisition [Member]
Summit acquisition, consideration transferred	$ 43,200,000
Summit acquisition, assets acquired	261,600,000
Summit acquisition, loans acquired	207,400,000
Summit acquisition, deposits acquired	$ 232,300,000
Locations | Locations	2
Summit acquisition, Goodwill recognized in acquisition	$ 13,300,000
Summit acquisition, Core deposit premium recognized in acquired	$ 5,600,000
Summit acquisition, Goodwill, Expected Tax Deductible Amount		$ 0

Acquisitions and Dispositions D

Acquisitions and Dispositions Dispositions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Jul. 25, 2014
Dispositions [Abstract]
Disposal Group, Including Discontinued Operation, Loans Receivable, Net		$ 13.3
Disposal Group, Including Discontinued Operation, Liabilities of Disposal Group		$ 60.3
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 2.1

Loans And Allowance For Loan 55

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Abstract]
Loans To Principal Holders (over 10% ownership in the Company's stock)	$ 0
Unfunded Loan Commitments	10,000,000,000
Unused Approved Credit Card Lines of Credit	4,700,000,000
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	3,600,000,000
Loans pledged at the Federal Reserve Bank as collateral for discount window borrowings	1,500,000,000
Net Investment in Direct Financing and Sales Type Leases	463,100,000	$ 413,000,000
Capital Leases, Net Investment in Sales Type Leases, Deferred Income	29,400,000	26,400,000
Property Subject to or Available for Operating Lease, Net	16,900,000	22,800,000
Credit Quality Personal Real Estate Loans Excluded	$ 257,800,000	244,300,000
Personal real estate loans excluded from table, as a percentage of Personal Banking portfolio	6.00%
Restructured loans	$ 53,662,000
Restructured loans on non-accrual status	14,900,000
Accruing Restructured Loans	38,739,000	40,313,000
Restructured loans performing under their modified terms	21,900,000	21,800,000
Aggregate restructured credit card loans held	7,900,000	10,400,000
Restructured Loans due to Bankruptcy	8,500,000	8,100,000
Decrease in interest income resulting from modification to credit card loans	(1,100,000)
Commitments to lend additional funds to customers with restructured loans	3,500,000	6,900,000
Loans Held-for-sale, Fair Value Disclosure	5,000,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	4,900,000
Student Loans Held for Sale, Lower of Cost or Fair Value	2,600,000
Foreclosed real estate	2,800,000	5,500,000
Personal property acquired in repossession	$ 3,300,000	$ 2,400,000

Loans And Allowance For Loan 56

Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 12,436,692	$ 11,469,238
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	4,397,893	3,969,952
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	624,070	403,507
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,355,544	2,288,215
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,915,953	1,883,092
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,924,365	1,705,134
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	432,981	430,873
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	779,744	782,370
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 6,142	$ 6,095

Loans And Allowance For Loan 57

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, 2015USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans to directors and executive officers, beginning balance	$ 55,273
Additions	246,475
Amounts collected	(250,581)
Amounts written off	0
Loans to directors and executive officers, ending balance	$ 51,167

Loans And Allowance For Loan 58

Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 156,532	$ 161,532	$ 172,532
Provision for Loan, Lease, and Other Losses	28,727	29,531	20,353
Loans charged off	51,050	52,773	54,199
Less recoveries	17,323	18,242	22,846
Allowance for Loan and Lease Losses Write-offs, Net	33,727	34,531	31,353
Balance at end of period	151,532	156,532	161,532
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	89,622	94,189	105,725
Provision for Loan, Lease, and Other Losses	(9,319)	(5,204)	(16,143)
Loans charged off	4,057	4,548	5,170
Less recoveries	5,840	5,185	9,777
Allowance for Loan and Lease Losses Write-offs, Net	(1,783)	(637)	(4,607)
Balance at end of period	82,086	89,622	94,189
Personal Banking Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	66,910	67,343	66,807
Provision for Loan, Lease, and Other Losses	38,046	34,735	36,496
Loans charged off	46,993	48,225	49,029
Less recoveries	11,483	13,057	13,069
Allowance for Loan and Lease Losses Write-offs, Net	35,510	35,168	35,960
Balance at end of period	$ 69,446	$ 66,910	$ 67,343

Loans And Allowance For Loan 59

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, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	$ 3,484	$ 6,841
All other loans, Allowance for loan losses	148,048	149,691
Impaired loans, Loans outstanding	65,314	81,088
All other loans, Loans outstanding	12,371,378	11,388,150
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	1,927	4,527
All other loans, Allowance for loan losses	80,159	85,095
Impaired loans, Loans outstanding	43,027	55,551
All other loans, Loans outstanding	7,334,480	6,606,123
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired loans, Allowance for loan losses	1,557	2,314
All other loans, Allowance for loan losses	67,889	64,596
Impaired loans, Loans outstanding	22,287	25,537
All other loans, Loans outstanding	$ 5,036,898	$ 4,782,027

Loans And Allowance For Loan 60

Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 26,575	$ 40,775
Restructured loans (accruing)	38,739	40,313
Total impaired loans	$ 65,314	$ 81,088

Loans And Allowance For Loan 61

Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 65,314,000	$ 81,088,000
Impaired Financing Receivable, Unpaid Principal Balance	84,138,000	104,827,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	17,457,000	28,469,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	27,370,000	38,667,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	47,857,000	52,619,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	56,768,000	66,160,000
Impaired Financing Receivable, Related Allowance	3,484,000	6,841,000
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,330,000	9,237,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	11,777,000	11,532,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	18,227,000	12,326,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	20,031,000	13,846,000
Impaired Financing Receivable, Related Allowance	1,119,000	1,844,000
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,961,000	4,552,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,956,000	8,493,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,227,000	8,148,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,804,000	9,610,000
Impaired Financing Receivable, Related Allowance	63,000	1,081,000
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,793,000	13,453,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,264,000	17,258,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,489,000	7,835,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	9,008,000	15,025,000
Impaired Financing Receivable, Related Allowance	745,000	1,602,000
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	373,000	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	373,000	0
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,667,000	9,096,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,530,000	12,465,000
Impaired Financing Receivable, Related Allowance	831,000	1,441,000
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,599,000	4,244,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,599,000	4,244,000
Impaired Financing Receivable, Related Allowance	63,000	50,000
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	1,227,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	1,384,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	704,000	529,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	852,000	529,000
Impaired Financing Receivable, Related Allowance	67,000	9,000
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,944,000	10,441,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,944,000	10,441,000
Impaired Financing Receivable, Related Allowance	$ 596,000	$ 814,000

Loans And Allowance For Loan 62

Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 29,733	$ 45,246
Restructured loans (accruing)	35,066	53,196
Average impaired loans	64,799	98,442
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	24,284	38,114
Restructured loans (accruing)	16,671	33,156
Average impaired loans	40,955	71,270
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	5,449	7,132
Restructured loans (accruing)	18,395	20,040
Average impaired loans	$ 23,844	$ 27,172

Loans And Allowance For Loan 63

Loans And Allowance For Loan Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 2,002	$ 2,372	$ 3,243
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	495	344	509
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	80	361	758
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	122	153	215
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	187	208	263
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	348	286	346
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	20	27	36
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized on impaired loans	$ 750	$ 993	$ 1,116

Loans And Allowance For Loan 64

Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 12,344,207	$ 11,365,009
30 – 89 Days Past Due	49,443	49,796
90 Days Past Due and Still Accruing	16,467	13,658
Non-accrual	26,575	40,775
Total	12,436,692	11,469,238
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	4,397,893	3,969,952
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	624,070	403,507
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,355,544	2,288,215
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,915,953	1,883,092
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,924,365	1,705,134
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	432,981	430,873
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	779,744	782,370
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,142	6,095
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	4,384,149	3,946,144
30 – 89 Days Past Due	2,306	11,152
90 Days Past Due and Still Accruing	564	1,096
Non-accrual	10,874	11,560
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	617,838	397,488
30 – 89 Days Past Due	3,142	827
90 Days Past Due and Still Accruing	0	35
Non-accrual	3,090	5,157
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,340,919	2,266,688
30 – 89 Days Past Due	6,762	3,661
90 Days Past Due and Still Accruing	0	0
Non-accrual	7,863	17,866
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	1,901,330	1,868,606
30 – 89 Days Past Due	7,117	6,618
90 Days Past Due and Still Accruing	3,081	1,676
Non-accrual	4,425	6,192
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	1,903,389	1,687,285
30 – 89 Days Past Due	18,273	16,053
90 Days Past Due and Still Accruing	2,703	1,796
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	427,998	428,478
30 – 89 Days Past Due	2,641	1,552
90 Days Past Due and Still Accruing	2,019	843
Non-accrual	323	0
Total	432,981	430,873
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	762,750	764,599
30 – 89 Days Past Due	8,894	9,559
90 Days Past Due and Still Accruing	8,100	8,212
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	5,834	5,721
30 – 89 Days Past Due	308	374
90 Days Past Due and Still Accruing	0	0
Non-accrual	$ 0	$ 0

Loans And Allowance For Loan 65

Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	$ 7,377,507	$ 6,661,674
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	7,179,210	6,441,941
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	65,344	107,437
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	111,126	77,713
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	21,827	34,583
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	4,397,893	3,969,952
Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	4,278,857	3,871,569
Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	49,302	62,904
Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	58,860	23,919
Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	10,874	11,560
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	624,070	403,507
Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	618,788	385,831
Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	1,033	3,865
Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	1,159	8,654
Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	3,090	5,157
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	2,355,544	2,288,215
Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	2,281,565	2,184,541
Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	15,009	40,668
Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	51,107	45,140
Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	$ 7,863	$ 17,866

Loans And Allowance For Loan 66

Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details)	Dec. 31, 2015	Dec. 31, 2014
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	1.50%	1.40%
Real Estate - Personal [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.00%	3.10%
Real Estate - Personal [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.10%	9.90%
Real Estate - Personal [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.00%	26.70%
Real Estate - Personal [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	61.40%	58.90%
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	4.50%	5.20%
Consumer [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.70%	10.20%
Consumer [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	21.80%	22.90%
Consumer [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.40%	28.00%
Consumer [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	37.60%	33.70%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Under 600 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.50%	1.80%
Revolving Home Equity [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.90%	4.40%
Revolving Home Equity [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	13.60%	13.70%
Revolving Home Equity [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	28.40%	32.80%
Revolving Home Equity [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	52.60%	47.30%
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	3.90%	4.10%
Consumer Credit Card [Member] | 600 - 659 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.00%	11.80%
Consumer Credit Card [Member] | 660 - 719 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	31.70%	32.40%
Consumer Credit Card [Member] | 720 - 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.90%	27.80%
Consumer Credit Card [Member] | Over 780 [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	24.50%	23.90%

Loans And Allowance For Loan 67

Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	$ 53,662
Balance 90 days past due at any time during previous 12 months	1,780
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	26,248
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	4,116
Balance 90 days past due at any time during previous 12 months	1,081
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	4,793
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	4,547
Balance 90 days past due at any time during previous 12 months	27
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,623
Balance 90 days past due at any time during previous 12 months	43
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	391
Balance 90 days past due at any time during previous 12 months	43
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	7,944
Balance 90 days past due at any time during previous 12 months	$ 586

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)SecuritiesInvestments_In_Single_Issuer	Dec. 31, 2014USD ($)Securities	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Investment [Line Items]
Non-marketable FHLB and FRB stock held for debt and regulatory purposes	$ 46,800	$ 46,600
Non-marketable private equity investments held	65,600	60,200
U.S. Treasury inflation-protected securities held	$ 416,800
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 95,800	123,900
Cumulative, credit-related portion of impairment (recorded in earnings) on the certain non-agency mortgage-backed securities on the watch list	$ 14,129	$ 13,734	$ 12,499	$ 11,306
Number of individual securities held in the available for sale portfolio | Securities	2,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | Securities	466	363
Portfolio securities aggregate fair value loss position	$ 5,120,187	$ 3,262,858
Available for sale securities in loss position at period end, change in unrealized loss	17,200
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	52,620	35,384
Fair value of securities in loss position for twelve months or longer	$ 767,349	1,137,135
Fair value of securities in a loss position for 12 months or longer, as a percentage of total available for sale portfolio	7.80%
Available for sale securities	$ 9,777,004	9,523,560
Securities pledged as collateral	4,100,000	4,700,000
Securities pledged and may be sold or re-pledged	$ 568,300
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%
State and municipal obligations [Member]
Investment [Line Items]
Auction rate securities, par value	$ 80,800
Auction rate securities held at fair value	17,200
Portfolio securities aggregate fair value loss position	98,118	388,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,739	8,354
Fair value of securities in loss position for twelve months or longer	31,120	215,702
Unrealized losses included in auction rate securities held	1,200
Unrealized losses included in other state and municipal obligations held	566
Available for sale securities	$ 1,741,957	1,813,201
State and municipal obligation portfolio, as a percentage of total available for sale securities	17.80%
Equity securities [Member]
Investment [Line Items]
Common stock classified as equity securities held by the holding company	$ 38,300
Available for sale securities	41,003	38,219
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Fair value of securities on other-than-temporary impairment watch list	44,000
Cumulative, credit-related portion of impairment (recorded in earnings) on the certain non-agency mortgage-backed securities on the watch list	14,100
Portfolio securities aggregate fair value loss position	708,139	185,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,819	1,228
Fair value of securities in loss position for twelve months or longer	54,536	43,659
Available for sale securities	$ 879,963	$ 382,744

Investment Securities (Investme

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	$ 9,777,004	$ 9,523,560
Trading securities	11,890	15,357
Non-marketable securities	112,786	106,875
Total investment securities	9,901,680	9,645,792
U.S. government and federal agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	727,076	501,407
US Government-sponsored Enterprise Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	793,023	963,127
State and municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	1,741,957	1,813,201
Agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	2,618,281	2,593,708
Non-agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	879,963	382,744
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	2,644,381	3,091,993
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	331,320	139,161
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	$ 41,003	$ 38,219

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost		$ 9,691,414	$ 9,386,302
Fair Value		9,777,004	9,523,560
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost		729,846	497,336
Fair Value		$ 727,076	501,407
Weighted Average Yield	[1]	1.29%
U.S. Government And Federal Agency Obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		$ 59,506
Fair Value		$ 59,870
Weighted Average Yield	[1]	1.82%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		$ 474,370
Fair Value		$ 476,793
Weighted Average Yield	[1]	1.56%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 143,468
Fair Value		$ 142,759
Weighted Average Yield	[1]	0.63%
U.S. Government And Federal Agency Obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 52,502
Fair Value		$ 47,654
Weighted Average Yield	[1]	0.02%
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Amortized Cost		$ 794,912	968,574
Fair Value		$ 793,023	963,127
Weighted Average Yield		1.79%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		$ 15,725
Fair Value		$ 15,818
Weighted Average Yield		2.08%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		$ 619,406
Fair Value		$ 618,442
Weighted Average Yield		1.62%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 154,151
Fair Value		$ 153,327
Weighted Average Yield		2.41%
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 5,630
Fair Value		$ 5,436
Weighted Average Yield		2.51%
State and municipal obligations [Member]
Investment [Line Items]
Amortized Cost		$ 1,706,635	1,789,215
Fair Value		$ 1,741,957	1,813,201
Weighted Average Yield		2.46%
State and municipal obligations [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		$ 105,233
Fair Value		$ 105,507
Weighted Average Yield		2.78%
State and municipal obligations [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		$ 673,068
Fair Value		$ 688,528
Weighted Average Yield		2.40%
State and municipal obligations [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 870,631
Fair Value		$ 889,719
Weighted Average Yield		2.43%
State and municipal obligations [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		$ 57,703
Fair Value		$ 58,203
Weighted Average Yield		3.16%
Agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost		$ 2,579,031	2,523,377
Fair Value		$ 2,618,281	2,593,708
Weighted Average Yield		2.62%
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost		$ 879,186	372,911
Fair Value		$ 879,963	382,744
Weighted Average Yield		2.54%
Asset-backed Securities [Member]
Investment [Line Items]
Amortized Cost		$ 2,660,201	3,090,174
Fair Value		$ 2,644,381	3,091,993
Weighted Average Yield		1.33%
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Amortized Cost		$ 6,118,418	5,986,462
Fair Value		$ 6,142,625	6,068,445
Weighted Average Yield		2.05%
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost		$ 335,925	140,784
Fair Value		331,320	139,161
Other Debt Securities [Member] | Maturity Within 1 Year [Member]
Investment [Line Items]
Amortized Cost		9,294
Fair Value		9,359
Other Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]
Investment [Line Items]
Amortized Cost		94,871
Fair Value		94,140
Other Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]
Investment [Line Items]
Amortized Cost		219,760
Fair Value		216,285
Other Debt Securities [Member] | Maturity After 10 Years [Member]
Investment [Line Items]
Amortized Cost		12,000
Fair Value		11,536
Equity securities [Member]
Investment [Line Items]
Amortized Cost		5,678	3,931
Fair Value		$ 41,003	$ 38,219
[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, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 9,691,414	$ 9,386,302
Available For Sale Securities, Gross Unreailzed Gain at Period End	138,210	172,642
Available For Sale Securities, Gross Unrealized Loss at Period End	(52,620)	(35,384)
Fair Value	9,777,004	9,523,560
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	729,846	497,336
Available For Sale Securities, Gross Unreailzed Gain at Period End	5,051	9,095
Available For Sale Securities, Gross Unrealized Loss at Period End	(7,821)	(5,024)
Fair Value	727,076	501,407
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Amortized Cost	794,912	968,574
Available For Sale Securities, Gross Unreailzed Gain at Period End	2,657	2,593
Available For Sale Securities, Gross Unrealized Loss at Period End	(4,546)	(8,040)
Fair Value	793,023	963,127
State and municipal obligations [Member]
Investment [Line Items]
Amortized Cost	1,706,635	1,789,215
Available For Sale Securities, Gross Unreailzed Gain at Period End	37,061	32,340
Available For Sale Securities, Gross Unrealized Loss at Period End	(1,739)	(8,354)
Fair Value	1,741,957	1,813,201
Agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost	2,579,031	2,523,377
Available For Sale Securities, Gross Unreailzed Gain at Period End	47,856	75,923
Available For Sale Securities, Gross Unrealized Loss at Period End	(8,606)	(5,592)
Fair Value	2,618,281	2,593,708
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Amortized Cost	879,186	372,911
Available For Sale Securities, Gross Unreailzed Gain at Period End	8,596	11,061
Available For Sale Securities, Gross Unrealized Loss at Period End	(7,819)	(1,228)
Fair Value	879,963	382,744
Asset-backed Securities [Member]
Investment [Line Items]
Amortized Cost	2,660,201	3,090,174
Available For Sale Securities, Gross Unreailzed Gain at Period End	1,287	6,922
Available For Sale Securities, Gross Unrealized Loss at Period End	(17,107)	(5,103)
Fair Value	2,644,381	3,091,993
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Amortized Cost	6,118,418	5,986,462
Available For Sale Securities, Gross Unreailzed Gain at Period End	57,739	93,906
Available For Sale Securities, Gross Unrealized Loss at Period End	(33,532)	(11,923)
Fair Value	6,142,625	6,068,445
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	335,925	140,784
Available For Sale Securities, Gross Unreailzed Gain at Period End	377	420
Available For Sale Securities, Gross Unrealized Loss at Period End	(4,982)	(2,043)
Fair Value	331,320	139,161
Equity securities [Member]
Investment [Line Items]
Amortized Cost	5,678	3,931
Available For Sale Securities, Gross Unreailzed Gain at Period End	35,325	34,288
Available For Sale Securities, Gross Unrealized Loss at Period End	0	0
Fair Value	$ 41,003	$ 38,219

Investment Securities (Cash Flo

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Dec. 31, 2015
Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	17.00%
Credit support	0.00%
Loss severity	19.00%
Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	53.00%
Credit support	24.00%
Loss severity	63.00%

Investment Securities (Changes

Investment Securities (Changes In Recorded Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	$ 14,129	$ 13,734	$ 12,499	$ 11,306
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	76	0	0
Credit losses on debt securities for which impairment was previously recognized	407	1,365	1,284
Increase in expected cash flows that are recognized over the remaining life of the security	$ (88)	$ (130)	$ (91)

Investment Securities (Securiti

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Less than 12 months, Fair Value	$ 4,352,838	$ 2,125,723
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	31,844	5,488
12 months or longer, Fair Value	767,349	1,137,135
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	20,776	29,896
Total, Fair Value	5,120,187	3,262,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	52,620	35,384
US Treasury and Government [Member]
Investment [Line Items]
Less than 12 months, Fair Value	491,998	90,261
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,098	818
12 months or longer, Fair Value	31,012	32,077
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,723	4,206
Total, Fair Value	523,010	122,338
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,821	5,024
US Government-sponsored Enterprise Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	157,830	224,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,975	922
12 months or longer, Fair Value	110,250	224,779
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,571	7,118
Total, Fair Value	268,080	449,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,546	8,040
State and municipal obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	66,998	172,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	544	646
12 months or longer, Fair Value	31,120	215,702
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,195	7,708
Total, Fair Value	98,118	388,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,739	8,354
Agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	530,035	55,128
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,989	429
12 months or longer, Fair Value	291,902	381,617
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5,617	5,163
Total, Fair Value	821,937	436,745
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8,606	5,592
Non-agency mortgage-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	653,603	141,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7,059	609
12 months or longer, Fair Value	54,536	43,659
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	760	619
Total, Fair Value	708,139	185,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,819	1,228
Asset-backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	2,207,922	1,424,457
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12,492	2,009
12 months or longer, Fair Value	223,311	159,098
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,615	3,094
Total, Fair Value	2,431,233	1,583,555
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	17,107	5,103
Total mortgage and asset-backed securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	3,391,560	1,621,240
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22,540	3,047
12 months or longer, Fair Value	569,749	584,374
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	10,992	8,876
Total, Fair Value	3,961,309	2,205,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	33,532	11,923
Other debt securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	244,452	16,434
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,687	55
12 months or longer, Fair Value	25,218	80,203
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,295	1,988
Total, Fair Value	269,670	96,637
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 4,982	$ 2,043

Investment Securities Investmen

Investment Securities Investment Securities (Credit Ratings In State And Municipal Bond Portfolio) (Details)	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	100.00%
Moody's, Aaa Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	6.70%
Moody's Aa Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	78.00%
Moody's A Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	14.60%
Moody's Not Rated [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of State and Municipal Bond Portfolio, by credit rating	0.70%

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Proceeds from sales of available for sale securities	$ 675,870	$ 30,998	$ 7,076
Proceeds from sales of non-marketable securities	13,161	33,444	9,223
Total proceeds	689,031	64,442	16,299
Investment securities gains (losses), net	6,320	14,124	(4,425)
Available-for-sale Securities [Member]
Investment [Line Items]
Gains realized on sales	2,925	0	126
Loss realized on sales	0	(5,197)	0
Gain realized on donation	0	1,570	1,375
Other-than-temporary impairment recognized on debt securities	(483)	(1,365)	(1,284)
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales	2,516	1,629	1,808
Losses realized on sales	(40)	(134)	(2,979)
Fair value adjustments, net	$ 1,402	$ 17,621	$ (3,471)

Land, Buildings And Equipment77

Land, Buildings And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 897,111	$ 885,877
Less accumulated depreciation and amortization	544,530	528,006
Net land, buildings and equipment	352,581	357,871
Depreciation expense	30,100	29,800	$ 30,700
Repairs and maintenance expense	16,300	16,500	$ 16,800
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	105,182	106,599
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	541,736	535,039
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 250,193	$ 244,239

Goodwill And Other Intangible78

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0	$ 0
Aggregate amortization expense for intangible assets	1,800	2,100	$ 2,200
Goodwill [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense for intangible assets	0	0
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense for intangible assets	1,541	1,917
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Recognized temporary impairment	29
Aggregate amortization expense for intangible assets	$ 253	$ 151

Goodwill And Other Intangible79

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 35,908	$ 34,963
Accumulated Amortization	(29,210)	(27,416)
Valuation Allowance	(29)	(97)
Net Amount	6,669	7,450
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(26,239)	(24,698)
Valuation Allowance	0	0
Net Amount	5,031	6,572
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,638	3,693
Accumulated Amortization	(2,971)	(2,718)
Valuation Allowance	(29)	(97)
Net Amount	$ 1,638	$ 878

Goodwill And Other Intangible80

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
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 Intangible81

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Amortization	$ (1,800)	$ (2,100)	$ (2,200)
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	6,572	8,489
Originations	0	0
Amortization	(1,541)	(1,917)
Impairment reversal	0	0
Balance, ending	5,031	6,572	8,489
Mortgage Servicing Rights [Member]
Goodwill [Roll Forward]
Balance, beginning	878	779
Originations	945	263
Amortization	(253)	(151)
Impairment reversal	68	(13)
Balance, ending	$ 1,638	$ 878	$ 779

Goodwill And Other Intangible82

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 1,412
2,017	1,068
2,018	817
2,019	677
2,020	$ 553

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Total Time Open And Certificates Of Deposit) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Deposits [Abstract]
Due in 2016	$ 1,547,305
Due in 2017	212,969
Due in 2018	125,508
Due in 2019	46,533
Due in 2020	61,059
Thereafter	4,335
Total	$ 1,997,709

Deposits (Maturities Of Time Op

Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 144,126
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	157,787
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	234,347
Certificates Of Deposit under $100,000, Due in over 12 months	83,037
Certificates Of Deposit under $100,000	619,297
Other Time Deposits under $100,000, Due in 3 months or less	28,527
Other Time Deposits under $100,000, Due in over 3 through 6 months	31,508
Other Time Deposits under $100,000, Due in over 6 through 12 months	46,719
Other Time Deposits under $100,000, Due in over 12 months	59,140
Other Time Deposits under $100,000	165,894
Certificates Of Deposit over $100,000, Due in 3 months or less	317,181
Certificates Of Deposit over $100,000, Due in over 3 through 6 months	338,601
Certificates Of Deposit over $100,000, Due in over 6 through 12 months	182,054
Certificates Of Deposit over $100,000, Due in over 12 months	298,460
Certificates Of Deposit over $100,000	1,136,296
Other Time Deposits over $100,000, Due in 3 months or less	13,995
Other Time Deposits over $100,000, Due in over 3 through 6 months	17,505
Other Time Deposits over $100,000, Due in over 6 through 12 months	34,955
Other Time Deposits other $100,000, Due in over 12 months	9,767
Other Time Deposits over $100,000	76,222
Due in 3 months or less, Total	503,829
Due in over 3 through 6 months, Total	545,401
Due in over 6 through 12 months, Total	498,075
Due in over 12 months, Total	450,404
Total	1,997,709
Aggregate amount of time open and certificates of deposit that exceed the $250,000 FDIC insurance limit	$ 922,100

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) $ in Millions	Dec. 31, 2015USD ($)
Debt Disclosure [Abstract]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	$ 1,400
Total outstanding advances	$ 103.8
Debt, Weighted Average Interest Rate	3.50%
FHLB issued letters of credit	$ 291.5

Borrowings (Short-Term Borrowin

Borrowings (Short-Term Borrowings) (Details) - Federal Funds Purchased And Repurchase Agreements [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Year End Weighted Rate	0.20%	0.10%	0.10%
Average Weighted Rate	0.10%	0.10%	0.10%
Average Balance Outstanding	$ 1,654,860	$ 1,119,578	$ 914,554
Maximum Outstanding at any Month End	2,193,197	1,862,518	1,479,849
Balance at December 31	$ 1,963,552	$ 1,862,518	$ 996,558

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, at federal statutory income tax rate	35.00%	35.00%	35.00%
Unrecognized Tax Benefits	$ 1,278	$ 1,312	$ 1,428
Unrecognized tax benefits impact the effective tax rate	$ 830	$ 852

Income Taxes (Schedule Of Compo

Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal, Current	$ 102,607	$ 110,552	$ 103,094
State and local, Current	6,551	11,637	10,900
Current, income tax expense (benefit)	109,158	122,189	113,994
U.S. federal, Deferred	7,084	(679)	7,984
State and local, Deferred	348	139	1,217
Deferred, income tax expense (benefit)	7,432	(540)	9,201
U.S. federal, Total	109,691	109,873	111,078
State and local, Total	6,899	11,776	12,117
Total income tax expense	$ 116,590	$ 121,649	$ 123,195

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrealized gain (loss) on securities available for sale	$ (19,634)	$ 36,525	$ (84,582)
Accumulated pension (benefit) loss	1,478	(4,433)	6,981
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	(2,132)	(1,850)	(1,003)
Income tax expense (benefit) allocated to stockholders’ equity	$ (20,288)	$ 30,242	$ (78,604)

Income Taxes (Components Of Def

Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Loans, principally due to allowance for loan losses	$ 60,885	$ 68,014
Accrued expenses	15,080	14,590
Equity-based compensation	12,733	12,689
Deferred Tax Assets, Investments	8,157	6,001
Deferred compensation	7,751	7,397
Pension	5,078	5,885
Deferred tax assets, Other	5,291	10,172
Total deferred tax assets	114,975	124,748
Equipment lease financing	67,938	67,531
Unrealized gain on securities available for sale	32,524	52,158
Land, buildings and equipment	12,186	14,520
Intangibles	7,674	7,532
Accretion on investment securities	5,893	5,919
Deferred tax liabilities, Other	4,129	3,181
Total deferred tax liabilities	130,344	150,841
Net deferred tax assets (liabilities)	$ (15,369)	$ (26,093)

Income Taxes (Schedule Of Compa

Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 133,112	$ 134,191	$ 134,455
Tax-exempt interest, net of cost to carry	(19,083)	(17,806)	(16,612)
State and local income taxes, net of federal tax benefit	4,484	7,655	7,876
Tax deductible dividends on allocated shares held by the Company’s ESOP	(1,093)	(1,116)	(1,116)
Other	(830)	(1,275)	(1,408)
Total income tax expense	$ 116,590	$ 121,649	$ 123,195

Income Taxes (Schedule Of Accru

Income Taxes (Schedule Of Accrued Liability For Unrecognized Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,312	$ 1,428
Gross increases – tax positions in prior period	40	20
Gross decreases – tax positions in prior period	0	(5)
Gross increases – current-period tax positions	272	299
Lapse of statute of limitations	(346)	(430)
Unrecognized tax benefits at end of year	$ 1,278	$ 1,312

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, discretionary contribution by employer	$ 0	$ 0	$ 0
Minimum required contribution for 2016	0
Contributions to the CERP	20,000	69,000	69,000
Recognized Net Loss Due to Settlements	0	1,687,000	$ 0
Accumulated benefit obligation	117,600,000	$ 125,400,000
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	$ 2,300,000
Expected long-term rate of return on pension plan assets	6.00%	6.00%	6.50%
Annualized 10-year return for pension plan	6.60%
Rate of return	0.60%	9.10%
Pension expense	$ 1,500,000
Expected pension expense for the upcoming fiscal year	$ 1,900,000
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 new mortality table [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in pension plan obligations due to change in mortality assumptions	$ 11,400,000
Change due to updated mortality projection scale [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in pension plan obligations due to change in mortality assumptions	$ 1,800,000

Employee Benefit Plans (Employe

Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total employee benefits	$ 60,180	$ 61,469	$ 56,688
Payroll Taxes [Member]
Total employee benefits	22,235	21,417	21,118
Medical Plans [Member]
Total employee benefits	20,659	22,855	18,490
401K Plan [Member]
Total employee benefits	12,841	12,057	12,465
Pension Plans [Member]
Total employee benefits	1,495	2,555	1,627
Other [Member]
Total employee benefits	$ 2,950	$ 2,585	$ 2,988

Employee Benefit Plans (Compone

Employee Benefit Plans (Components Of The Net Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost-benefits earned during the year	$ 503	$ 430	$ 509
Interest cost on projected benefit obligation	4,762	5,069	4,509
Expected return on plan assets	(6,092)	(6,285)	(6,476)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(271)	0	0
Amortization of unrecognized net loss	2,593	1,654	3,085
Recognized Net Loss Due to Settlements	0	1,687	0
Net periodic pension cost	$ 1,495	$ 2,555	$ 1,627

Employee Benefit Plans (Summary

Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at prior valuation date	$ 125,447	$ 113,673
Service cost	503	430	$ 509
Interest cost	4,762	5,069	4,509
Defined Benefit Plan, Settlements, Benefit Obligation	0	(7,163)
Defined Benefit Plan, Plan Amendments	(2,619)	0
Benefits paid	(6,400)	(5,193)
Actuarial loss	(4,131)	18,631
Projected benefit obligation at valuation date	117,562	125,447	113,673
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior valuation date	104,794	107,172
Actual return on plan assets	911	9,909
Employer contributions	20	69
Defined Benefit Plan, Settlements, Plan Assets	0	(7,163)
Benefits paid	(6,400)	(5,193)
Fair value of plan assets at valuation date	99,325	104,794	$ 107,172
Funded status and net amount recognized at valuation date	$ (18,237)	$ (20,653)

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Prior service credit (cost)	$ 2,348	$ 0
Accumulated loss	(35,602)	(37,145)
Accumulated other comprehensive loss	(33,254)	(37,145)
Cumulative employer contributions in excess of net periodic benefit cost	15,017	16,492
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	(18,237)	(20,653)
Prior Service Cost	2,618	0
Net loss arising during period	(1,050)	(15,007)
Amortization of net loss	2,593	3,341
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(271)	0	$ 0
Total recognized in other comprehensive income	3,890	(11,666)
Total expense recognized in net periodic pension cost and other comprehensive income	$ 2,395	$ (14,221)

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions On A Weighted Average Basis, Used In Accounting For Plans) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Determination of benefit obligation at year end, Discount rate	4.15%	3.95%	4.55%
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	3.95%	4.55%	3.65%
Determination of net periodic benefit cost for year ended, Long-term rate of return on assets	6.00%	6.00%	6.50%
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, 2015	Dec. 31, 2014
U.S. government obligations		$ 727,076	$ 501,407
Government-sponsored enterprise obligations		793,023	963,127
State and municipal obligations		1,741,957	1,813,201
Agency mortgage-backed securities		2,618,281	2,593,708
Non-agency mortgage-backed securities		879,963	382,744
Asset-backed securities		2,644,381	3,091,993
Pension Plans [Member]
U.S. government obligations		2,540	1,290
Government-sponsored enterprise obligations	[1]	1,208	1,259
State and municipal obligations		10,478	10,638
Agency mortgage-backed securities	[2]	1,352	1,762
Non-agency mortgage-backed securities		5,740	5,635
Asset-backed securities		6,965	5,776
Corporate bonds	[3]	32,800	34,264
U.S. large-cap	[4]	15,746	20,296
U.S. mid-cap	[4]	12,960	13,362
U.S. small-cap	[4]	2,545	3,590
International developed markets	[4]	3,125	3,377
Emerging markets	[4]	392	473
Money market funds	[4]	3,474	3,072
Total		99,325	104,794
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
U.S. government obligations		727,076	501,407
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		2,540	1,290
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
U.S. large-cap	[4]	15,746	20,296
U.S. mid-cap	[4]	12,960	13,362
U.S. small-cap	[4]	2,545	3,590
International developed markets	[4]	3,125	3,377
Emerging markets	[4]	392	473
Money market funds	[4]	3,474	3,072
Total		40,782	45,460
Significant Other Observable Inputs (Level 2) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		793,023	963,127
State and municipal obligations		1,724,762	1,718,058
Agency mortgage-backed securities		2,618,281	2,593,708
Non-agency mortgage-backed securities		879,963	382,744
Asset-backed securities		2,644,381	3,091,993
Significant Other Observable Inputs (Level 2) [Member] | Pension Plans [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations	[1]	1,208	1,259
State and municipal obligations		10,478	10,638
Agency mortgage-backed securities	[2]	1,352	1,762
Non-agency mortgage-backed securities		5,740	5,635
Asset-backed securities		6,965	5,776
Corporate bonds	[3]	32,800	34,264
U.S. large-cap	[4]	0	0
U.S. mid-cap	[4]	0	0
U.S. small-cap	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Money market funds	[4]	0	0
Total		58,543	59,334
Significant Unobservable Inputs (Level 3) [Member]
U.S. government obligations		0	0
Government-sponsored enterprise obligations		0	0
State and municipal obligations		17,195	95,143
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
U.S. large-cap	[4]	0	0
U.S. mid-cap	[4]	0	0
U.S. small-cap	[4]	0	0
International developed markets	[4]	0	0
Emerging markets	[4]	0	0
Money market funds	[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, consumer goods, healthcare, technology, and manufacturing sectors.

Employee Benefit Plans (Future

Employee Benefit Plans (Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
2,016	$ 6,922
2,017	7,102
2,018	7,202
2,019	7,249
2,020	7,419
2021 - 2025	$ 36,940

Stock-Based Compensation and101

Stock-Based Compensation and Directors Stock Purchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for issuance under the plan	3,303,021
Stock-based compensation	$ 10.1	$ 8.8	$ 6.4
Total tax benefit recognized from compensation arrangements	3.8	3.3	2.4
Fair value of shares vested during the period	6	$ 4.5	$ 2.1
Unrecognized compensation cost related to unvested options, SAR's and stock awards	$ 19.9
Compensation cost is expected to be recognized over a weighted average period, years	2 years 8 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
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period (in years)	3 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	106,865
Number of shares purchased under stock option plan	23,425	21,122
Average price of shares purchased under stock option plan	$ 41.60	$ 40.32

Stock-Based Compensation and102

Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of The Status Of Nonvested Share Awards) (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Nonvested Share Awards [Roll Forward]
Nonvested, share awards, beginning balance | shares	1,322,502
Granted, Shares | shares	233,654
Vested, Shares | shares	(150,196)
Forfeited, Shares | shares	(21,543)
Nonvested, share awards, ending balance | shares	1,384,417
Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 32.77
Granted, Weighted Average Grant Date Fair Value | $ / shares	39.85
Vested, Weighted Average Grant Date Fair Value | $ / shares	28.67
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	34.37
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 34.38

Stock-Based Compensation and103

Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of SAR Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares
Stock Appreciation Rights, Shares [Roll Forward]
Outstanding, Shares, Beginning Balance | shares	1,869,224
Granted, Shares | shares	252,149
Forfeited, Shares | shares	(7,837)
Expired, Shares | shares	(1,237)
Exercised, Shares | shares	(523,842)
Outstanding, Shares, Ending Balance | shares	1,588,457
Exercisable, Shares, Ending Balance | shares	1,078,797
Vested and Expected to Vest, Shares | shares	1,563,538
Stock Appreciation Rights, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 32.34
Granted, Weighted Average Exercise Price | $ / shares	39.43
Forfeited, Weighted Average Exercise Price | $ / shares	37.46
Expired, Weighted Average Exercise Price | $ / shares	35.53
Exercised, Weighted Average Exercise Price | $ / shares	31.44
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	33.74
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares	31.56
Vested and Expected to Vest, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 33.67
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 4 months
Stock Appreciation Rights Intrinsic Value | $	$ 13,978
Exercisable, Weighted Average Remaining Contractual Term (in years)	2 years 5 months
Exercisable, Aggregate Intrinsic Value, Ending Balance | $	$ 11,845
Vested and Expected to Vest, Weighted Average Remaining Contractual Term (in years)	4 years 2 months
Vested and Expected to Vest, Aggregate Intrinsic Value, Ending Balance | $	$ 13,867

Stock-Based Compensation and104

Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of Option Activity) (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Stock Options [Roll Forward]
Outstanding, Shares, Beginning Balance | shares	72,091
Granted, Shares | shares	0
Forfeited, Shares | shares	0
Expired, Shares | shares	0
Exercised, Shares | shares	(72,091)
Outstanding, Shares, Ending Balance | shares	0
Stock Options, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 27.88
Granted, Weighted Average Exercise Price | $ / shares	0
Forfeited, Weighted Average Exercise Price | $ / shares	0
Expired, Weighted Average Exercise Price | $ / shares	0
Exercised, Weighted Average Exercise Price | $ / shares	27.88
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 0

Stock-Based Compensation and105

Stock-Based Compensation and Directors Stock Purchase Plan Share Based Compensation Valuation Assumptions [Table] (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 7.22	$ 8.40	$ 6.18
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.20%	2.00%	2.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	21.30%	22.10%	23.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.80%	2.30%	1.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years 2 months	7 years 1 month	7 years 3 months

Stock-Based Compensation and106

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation [Abstract]
Intrinsic value of options and SARs exercised	$ 7,541	$ 8,068	$ 6,580
Cash received from options and SARs exercised	1,914	8,652	9,426
Tax benefit realized from options and SARs exercised	$ 1,041	$ 1,153	$ 335

Accumulated Other Comprehens107

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		$ 32,470	$ 62,093	$ 9,731
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(47,658)	76,121
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(121)	8,333
Other Comprehensive Income (Loss), before Tax		(47,779)	84,454
Other Comprehensive Income (Loss), Tax		18,156	(32,092)
Other comprehensive income		(29,623)	52,362	(126,613)
Reclassification Where Impairment Was Not Previously Recognized		0	0
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[1]	(20,596)	(23,008)	(15,775)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	1,568	(15,007)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	2,322	3,341
Other Comprehensive Income (Loss), before Tax	[1]	3,890	(11,666)
Other Comprehensive Income (Loss), Tax	[1]	(1,478)	4,433
Other comprehensive income	[1]	2,412	(7,233)
Reclassification Where Impairment Was Not Previously Recognized	[1]	0	0
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[2]	49,750	81,310	21,303
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[2]	(47,907)	93,158
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(2,926)	3,627
Other Comprehensive Income (Loss), before Tax	[2]	(50,833)	96,785
Other Comprehensive Income (Loss), Tax	[2]	19,316	(36,778)
Other comprehensive income	[2]	(31,517)	60,007
Reclassification Where Impairment Was Not Previously Recognized	[2]	(43)	0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	[2]	3,316	3,791	$ 4,203
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[2]	(1,319)	(2,030)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	483	1,365
Other Comprehensive Income (Loss), before Tax	[2]	(836)	(665)
Other Comprehensive Income (Loss), Tax	[2]	318	253
Other comprehensive income	[2]	(518)	(412)
Reclassification Where Impairment Was Not Previously Recognized	[2]	$ 43	$ 0
[1]	The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of prior service cost, "amortization of unrecognized net loss" and "settlement loss recognized" (see Note 10), for inclusion in the consolidated statements of income.
[2]	The pre-tax amounts reclassified from accumulated other comprehensive income 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, 2015USD ($)Operating_Segments	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Jan. 01, 2015USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Operating_Segments	3
Personal real estate loans transferred between segments				$ 340,000
Net interest income	$ 634,320	$ 620,204	$ 619,372
Provision for loan losses	(28,727)	(29,531)	(20,353)
Non-interest income	447,555	435,978	418,386
Investment securities gains (losses), net	6,320	14,124	(4,425)
Non-interest expense	(675,903)	(656,342)	(628,668)
Income before income taxes	383,565	384,433	384,312
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	266,328	264,974	262,579
Provision for loan losses	(34,864)	(34,913)	(33,943)
Non-interest income	119,558	113,869	108,180
Investment securities gains (losses), net	0	0	0
Non-interest expense	(273,323)	(263,521)	(260,336)
Income before income taxes	77,699	80,409	76,480
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	296,466	287,244	280,121
Provision for loan losses	1,032	559	3,772
Non-interest income	194,131	190,538	186,433
Investment securities gains (losses), net	0	0	0
Non-interest expense	(267,521)	(254,121)	(235,382)
Income before income taxes	224,108	224,220	234,944
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	42,653	40,128	40,185
Provision for loan losses	75	372	(688)
Non-interest income	136,374	128,238	117,322
Investment securities gains (losses), net	0	0	0
Non-interest expense	(108,755)	(98,821)	(96,530)
Income before income taxes	70,347	69,917	60,289
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	605,447	592,346	582,885
Provision for loan losses	(33,757)	(33,982)	(30,859)
Non-interest income	450,063	432,645	411,935
Investment securities gains (losses), net	0	0	0
Non-interest expense	(649,599)	(616,463)	(592,248)
Income before income taxes	372,154	374,546	371,713
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	28,873	27,858	36,487
Provision for loan losses	5,030	4,451	10,506
Non-interest income	(2,508)	3,333	6,451
Investment securities gains (losses), net	6,320	14,124	(4,425)
Non-interest expense	(26,304)	(39,879)	(36,420)
Income before income taxes	$ 11,411	$ 9,887	$ 12,599

Segments Segments (Segment Bala

Segments Segments (Segment Balance Sheet Data) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Average Assets	$ 23,737,602	$ 22,672,923
Loans, including held for sale	11,873,391	11,260,233
Goodwill and other intangible assets	145,956	147,265
Deposits	19,325,591	18,795,676
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	2,643,094	2,519,476
Loans, including held for sale	2,500,002	2,376,275
Goodwill and other intangible assets	75,964	76,786
Deposits	9,667,972	9,536,003
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	7,302,671	6,966,453
Loans, including held for sale	7,125,310	6,783,404
Goodwill and other intangible assets	69,246	69,733
Deposits	7,548,925	7,288,884
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Average Assets	1,038,119	931,397
Loans, including held for sale	1,029,332	922,120
Goodwill and other intangible assets	746	746
Deposits	2,056,190	1,911,391
Segment Totals [Member]
Segment Reporting Information [Line Items]
Average Assets	10,983,884	10,417,326
Loans, including held for sale	10,654,644	10,081,799
Goodwill and other intangible assets	145,956	147,265
Deposits	19,273,087	18,736,278
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Average Assets	12,753,718	12,255,597
Loans, including held for sale	1,218,747	1,178,434
Goodwill and other intangible assets	0	0
Deposits	$ 52,504	$ 59,398

Common and Preferred Stock (Nar

Common and Preferred Stock (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, shares authorized	120,000,000	120,000,000
Common stock dividend rate percentage	5.00%
Common stock, par value	$ 5	$ 5
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	402,000	0	0
Shares available for purchase under the current Board authorization	5,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	4,717,944

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 263,730	$ 261,754	$ 260,961
Preferred Stock Dividends, Income Statement Impact	9,000	4,050	0
Net Income (Loss) Available to Common Stockholders, Basic	$ 254,730	$ 257,704	$ 260,961
Basic income per common share (in dollars per share)	$ 2.56	$ 2.50	$ 2.47
Diluted income per common share (in dollars per share)	$ 2.56	$ 2.49	$ 2.46
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.	$ 263,730	$ 261,754	$ 260,961
Preferred Stock Dividends, Income Statement Impact	9,000	4,050	0
Net Income (Loss) Available to Common Stockholders, Basic	254,730	257,704	260,961
Less income allocated to nonvested restricted stockholders	3,548	3,332	2,939
Net income available to common stockholders	$ 251,182	$ 254,372	$ 258,022
Weighted average common shares outstanding	97,974	101,833	104,280
Basic income per common share (in dollars per share)	$ 2.56	$ 2.50	$ 2.47
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	$ 254,730	$ 257,704	$ 260,961
Less income allocated to nonvested restricted stockholders	3,541	3,323	2,931
Net income available to common stockholders	$ 251,189	$ 254,381	$ 258,030
Weighted average common shares outstanding	97,974	101,833	104,280
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	305	420	439
Weighted average diluted common shares outstanding	98,279	102,253	104,719
Diluted income per common share (in dollars per share)	$ 2.56	$ 2.49	$ 2.46

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Common Stock [Roll Forward]
Shares outstanding, beginning balance	96,327	95,881	91,414
Awards and sales under employee and director plans	435	549	653
5% stock dividend	4,641	4,586	4,565
Stock Issued During Period, Shares, Acquisitions	0	0	1,000
Purchases of treasury stock under accelerated share buyback programs	(3,635)	(3,055)	0
Other purchases of treasury stock	(535)	(1,626)	(1,742)
Other	(7)	(8)	(9)
Shares outstanding, ending balance	97,226	96,327	95,881

Common and Preferred Stock Pref

Common and Preferred Stock Preferred Stock Issuance (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	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				$ 150,000
Preferred Stock, Liquidation Preference Per Share				$ 25
Proceeds from issuance of preferred stock	$ 0	$ 144,784	$ 0

Common and Preferred Stock Acce

Common and Preferred Stock Accelerated Share Repurchase (Details) - USD ($) $ in Millions	Aug. 27, 2015	Jun. 24, 2015	May. 21, 2015	Jun. 20, 2014
Accelerated Share Repurchase [Abstract]
Accelerated Share Repurchase Program Repurchase Amount			$ 100	$ 200
Shares received under accelerated share repurchase program	369,201	1,554,397	1,893,598	3,368,616

Regulatory Capital Requireme115

Regulatory Capital Requirements (Schedule Of Capital Amounts And Ratios On Consolidated Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	8.00%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%
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), Minimum Capital Requirement Ratio	4.00%
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	$ 2,364,761	$ 2,304,206
Total Capital (to risk-weighted assets), Actual Ratio	13.28%	14.86%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,424,764	$ 1,240,732
Total Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	8.00%	8.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 2,196,258	$ 2,131,169
Tier I Capital (to risk-weighted assets), Actual Ratio	12.33%	13.74%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,068,573	$ 620,366
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%	4.00%
Tier I Common Capital (to risk-weighted assets), Actual Amount	$ 2,051,474
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	11.52%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 801,430
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Amount	$ 2,196,258	$ 2,131,169
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	9.23%	9.36%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 951,370	$ 910,977
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	$ 2,135,668	$ 2,026,666
Total Capital (to risk-weighted assets), Actual Ratio	12.07%	13.16%
Total Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,415,812	$ 1,232,378
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	$ 1,769,765	$ 1,540,472
Total Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	10.00%	10.00%
Tier I Capital (to risk-weighted assets), Actual Amount	$ 1,983,051	$ 1,869,053
Tier I Capital (to risk-weighted assets), Actual Ratio	11.21%	12.13%
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 1,061,859	$ 616,189
Tier I Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	6.00%	4.00%
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,415,812	$ 924,283
Tier I Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Ratio	8.00%	6.00%
Tier I Common Capital (to risk-weighted assets), Actual Amount	$ 1,983,051
Tier I Common Capital (to rIsk-weighted assets), Actual Rato	11.21%
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Amount	$ 796,394
Tier I Common Capital (to risk-weighted assets), Minimum Capital Requirement Ratio	4.50%
Tier I Common Capital (to risk-weighted assets), Well-Capitalized Capital Requirement Amount	$ 1,150,347
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), Actual Amount	$ 1,983,051	$ 1,869,053
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Actual Ratio	8.37%	8.24%
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Minimum Capital Requirement Amount	$ 948,259	$ 907,807
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	$ 1,185,324	$ 1,134,759
Tier I Capital (to adjusted quarterly average assets) (Leverage Ratio), Well-Capitalized Capital Requirement Ratio	5.00%	5.00%

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments, included in non-marketable securities	$ 63,032	$ 57,581
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	17,200
Private equity investments, included in non-marketable securities	$ 63,032	$ 57,581

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 4,981,000	$ 0
U.S. government and federal agency obligations	727,076,000	501,407,000
Government-sponsored enterprise obligations	793,023,000	963,127,000
State and municipal obligations	1,741,957,000	1,813,201,000
Agency mortgage-backed securities	2,618,281,000	2,593,708,000
Non-agency mortgage-backed securities	879,963,000	382,744,000
Asset-backed securities	2,644,381,000	3,091,993,000
Other debt securities	331,320,000	139,161,000
Equity securities	41,003,000	38,219,000
Trading securities	11,890,000	15,357,000
Private equity investments	63,032,000	57,581,000
Derivative Assets	12,771,000	10,457,000
Deferred Compensation Plan Assets	9,278,000	8,848,000
Total assets	9,878,956,000	9,615,803,000
Derivative Liability	12,729,000	10,948,000
Total liabilities	12,729,000	10,948,000
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	727,076,000	501,407,000
Government-sponsored enterprise obligations	0	0
State and municipal obligations	0	0
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Equity securities	20,263,000	17,975,000
Trading securities	0	0
Private equity investments	0	0
Derivative Assets	0	0
Deferred Compensation Plan Assets	9,278,000	8,848,000
Total assets	756,617,000	528,230,000
Derivative Liability	0	0
Total liabilities	0	0
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	4,981,000	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	793,023,000	963,127,000
State and municipal obligations	1,724,762,000	1,718,058,000
Agency mortgage-backed securities	2,618,281,000	2,593,708,000
Non-agency mortgage-backed securities	879,963,000	382,744,000
Asset-backed securities	2,644,381,000	3,091,993,000
Other debt securities	331,320,000	139,161,000
Equity securities	20,740,000	20,244,000
Trading securities	11,890,000	15,357,000
Private equity investments	0	0
Derivative Assets	12,507,000	10,454,000
Deferred Compensation Plan Assets	0	0
Total assets	9,041,848,000	8,934,846,000
Derivative Liability	12,534,000	10,722,000
Total liabilities	12,534,000	10,722,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	0	0
State and municipal obligations	17,195,000	95,143,000
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Equity securities	0	0
Trading securities	0	0
Private equity investments	63,032,000	57,581,000
Derivative Assets	264,000	3,000
Deferred Compensation Plan Assets	0	0
Total assets	80,491,000	152,727,000
Derivative Liability	195,000	226,000
Total liabilities	$ 195,000	$ 226,000

Fair Value Measurements (Sum118

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, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 152,501	$ 184,271
Total gains or losses (realized/unrealized) included in earnings	1,722	19,259
Total gains losses (realized/unrealized) included in other comprehensive income	4,169	3,638
Investment securities called	(82,825)	(38,225)
Discount accretion	708	2,006
Purchases of private equity securities	13,112	14,152
Sale / paydown of private equity securities	(9,204)	(32,464)
Capitalized interest/dividends	141	144
Purchase of risk participation agreement	0	41
Sale of risk participation agreement	(28)	(321)
Ending balance	80,296	152,501
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	1,449	836
State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	95,143	127,724
Total gains or losses (realized/unrealized) included in earnings	0	0
Total gains losses (realized/unrealized) included in other comprehensive income	4,169	3,638
Investment securities called	(82,825)	(38,225)
Discount accretion	708	2,006
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	17,195	95,143
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	57,581	56,612
Total gains or losses (realized/unrealized) included in earnings	1,402	19,137
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	13,112	14,152
Sale / paydown of private equity securities	(9,204)	(32,464)
Capitalized interest/dividends	141	144
Purchase of risk participation agreement	0	0
Sale of risk participation agreement	0	0
Ending balance	63,032	57,581
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	1,127	718
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	(223)	(65)
Total gains or losses (realized/unrealized) included in earnings	320	122
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	0	41
Sale of risk participation agreement	(28)	(321)
Ending balance	69	(223)
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	$ 322	$ 118

Fair Value Measurements (Sum119

Fair Value Measurements (Summary of Gains and Losses on Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	$ 1,722	$ 19,259
Change in unrealized gains or losses relating to assets still held at period end	1,449	836
Loans Fees And Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	263	0
Change in unrealized gains or losses relating to assets still held at period end	263	0
Other Non-Interest Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	57	122
Change in unrealized gains or losses relating to assets still held at period end	59	118
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	1,402	19,137
Change in unrealized gains or losses relating to assets still held at period end	$ 1,127	$ 718

Fair Value Measurements (Sum120

Fair Value Measurements (Summary of Quantitative Information About Level 3 Fair Value Measurements) (Details)	12 Months Ended
	Dec. 31, 2015
Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Discounted Cash Flow, Valuation Techniques	Discounted cash flow
Fair Value, Estimated Market Recovery Period, Years	5 years
Private Equity Funds [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Market Comparable Companies, Valuation Techniques	Market comparable companies
Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Discounted Cash Flow, Valuation Techniques	Discounted cash flow
Minimum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Rate, Percent	3.30%
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	64.10%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	0.90%
Maximum [Member] | Auction Rate Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Estimated Market Rate, Percent	3.50%
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	5.5
Maximum [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	100.00%
Embedded Servicing Value, Mortgage Loan Commitments, Discounted Cash Flow	1.00%
Weighted Average [Member] | Mortgage Loan Commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Weighted Average, Probability of Funding	80.90%
Weighted Average, Embedded Servicing Value	1.00%

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, 2015	Dec. 31, 2014
Fair Value [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	$ 5,457	$ 11,742
Private Equity Investments Nonrecurring Basis	0	984
Mortgage servicing rights	1,638	878
Foreclosed assets	238	2,540
Long Lived Assets Nonrecurring Basis	822	9,895
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	0	0
Private Equity Investments Nonrecurring Basis	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long Lived Assets Nonrecurring Basis	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	0	0
Private Equity Investments Nonrecurring Basis	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long Lived Assets Nonrecurring Basis	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	5,457	11,742
Private Equity Investments Nonrecurring Basis	0	984
Mortgage servicing rights	1,638	878
Foreclosed assets	238	2,540
Long Lived Assets Nonrecurring Basis	822	9,895
Total Gains (Losses) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral dependent impaired loans, Total Gains (Losses)	(2,464)	(1,184)
Private Equity Investments Nonrecurring Basis Gains Losses	0	(1,516)
Mortgage servicing rights, Total Gains (Losses)	68	(13)
Foreclosed assets, Total Gains (Losses)	(108)	(706)
Long Lived Assets Nonrecurring Basis Gains Losses	$ (240)	$ (2,327)

Fair Value Of Financial Inst122

Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 5,000
Available for sale securities	9,777,004	$ 9,523,560
Trading securities	11,890	15,357
Non-marketable	112,786	106,875
Securities Purchased under Agreements to Resell	875,000	1,050,000
Cash and due from banks	464,411	467,488
Derivative Assets	12,771	10,457
Non-interest bearing deposits	7,146,398	6,811,959
Savings, interest checking and money market deposits	10,834,746	10,541,601
Time open and certificates of deposit	1,997,709
Derivative Liability	12,729	10,948
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Derivative Assets	0	0
Derivative Liability	0	0
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	11,890	15,357
Derivative Assets	12,507	10,454
Derivative Liability	12,534	10,722
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Derivative Assets	264	3
Derivative Liability	195	226
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	747,339	519,382
Federal funds sold	14,505	32,485
Interest earning deposits with banks	23,803	600,744
Cash and due from banks	464,411	467,488
Non-interest bearing deposits	7,146,398	6,811,959
Savings, interest checking and money market deposits	10,834,746	10,541,601
Federal funds purchased	556,970	3,840
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	7,607	0
Available for sale securities	9,012,470	8,909,035
Trading securities	11,890	15,357
Derivative Assets	12,507	10,454
Derivative Liability	12,534	10,722
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	17,195	95,143
Non-marketable	112,786	106,875
Securities Purchased under Agreements to Resell	875,000	1,050,000
Derivative Assets	264	3
Time open and certificates of deposit	1,997,709	2,122,218
Securities sold under agreements to repurchase	1,406,582	1,858,678
Other borrowings	103,818	104,058
Derivative Liability	195	226
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,397,893	3,969,952
Carrying (Reported) Amount, 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	624,070	403,507
Carrying (Reported) Amount, 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	2,355,544	2,288,215
Carrying (Reported) Amount, 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	1,915,953	1,883,092
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,924,365	1,705,134
Carrying (Reported) Amount, 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	432,981	430,873
Carrying (Reported) Amount, 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	779,744	782,370
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	6,142	6,095
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	747,339	519,382
Federal funds sold	14,505	32,485
Interest earning deposits with banks	23,803	600,744
Cash and due from banks	464,411	467,488
Non-interest bearing deposits	7,146,398	6,811,959
Savings, interest checking and money market deposits	10,834,746	10,541,601
Federal funds purchased	556,970	3,840
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 Held-for-sale, Fair Value Disclosure	7,607	0
Available for sale securities	9,012,470	8,909,035
Trading securities	11,890	15,357
Derivative Assets	12,507	10,454
Derivative Liability	12,534	10,722
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	17,195	95,143
Non-marketable	112,786	106,875
Securities Purchased under Agreements to Resell	879,546	1,048,866
Derivative Assets	264	3
Time open and certificates of deposit	1,993,521	2,121,114
Securities sold under agreements to repurchase	1,406,670	1,858,731
Other borrowings	108,542	111,102
Derivative Liability	195	226
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	4,421,237	3,982,531
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	633,083	407,905
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	2,387,101	2,315,378
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	1,940,863	1,933,456
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	1,916,747	1,701,037
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	434,607	433,508
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	793,428	794,929
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	$ 6,142	$ 6,095

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) $ in Millions	Dec. 31, 2015USD ($)
Real Estate And Building Materials [Member]
Derivative [Line Items]
Derivative loss from industry concentration	$ 5.5
Retirement communities [Member]
Derivative [Line Items]
Derivative loss from industry concentration	1.4
Education [Member]
Derivative [Line Items]
Derivative loss from industry concentration	1.3
Swaps with Central Clearing Agency [Member]
Derivative [Line Items]
Swap Net Liability Position Fair Value	11.9
Swaps with Central Clearing Agency [Member] | Investment Securities [Member]
Derivative [Line Items]
Value Of Collateral Posted	2.4
Swaps with Central Clearing Agency [Member] | Cash [Member]
Derivative [Line Items]
Value Of Collateral Posted	$ 17.9

Derivative Instruments (Schedul

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,184,666	$ 797,030
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,020,310	647,709
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	66,118	53,587
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	62,456	75,943
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	15,535	19,791
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	8,605	0
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	642	0
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 11,000	$ 0

Derivative Instruments (Sche125

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Other assets	$ 12,771	$ 10,457
Other liabilities	(12,729)	(10,948)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	11,993	10,144
Other liabilities	(11,993)	(10,166)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	73	62
Other liabilities	(73)	(62)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	3
Other liabilities	(195)	(226)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	437	248
Other liabilities	(430)	(494)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	263	0
Other liabilities	0	0
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	0	0
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	4	0
Other liabilities	$ (38)	$ 0

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 4,996	$ 1,566	$ 1,455
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	4,309	1,674	1,140
Other Non-Interest Income [Member] | Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	32	33	0
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	57	122	234
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	253	(263)	81
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	263	0	0
Loans Fees And Sales [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	0	0	0
Loans Fees And Sales [Member] | Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 82	$ 0	$ 0

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Offsetting [Line Items]
Derivative Assets	$ 12,771	$ 10,457
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	12,771	10,457
Derivative Liability	12,729	10,948
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	12,729	10,948
Derivative Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	12,071	10,209
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Noncurrent	12,071	10,209
Derivative Asset, Not Offset, Policy Election Deduction	(94)	(251)
Derivative Asset, Fair Value of Collateral	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	11,977	9,958
Derivative Liability, Fair Value, Gross Liability	12,299	10,454
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Noncurrent	12,299	10,454
Derivative Liability, Not Offset, Policy Election Deduction	(94)	(251)
Derivative Liability, Fair Value of Collateral	(10,927)	(8,738)
Derivative Liability, Fair Value, Amount Offset Against Collateral	1,278	1,465
Derivative Not Subject to Master Netting Agreement [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	700	248
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	700	248
Derivative Liability, Fair Value, Gross Liability	430	494
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 430	$ 494

Resale and Repurchase Agreem128

Resale and Repurchase Agreements (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Collateral swap agreements	$ 550	$ 450
Collateral Already Posted, Aggregate Fair Value	565.8
Collateral Accepted, Aggregate Fair Value	$ 629.6

Resale and Repurchase Agreem129

Resale and Repurchase Agreements Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	$ (1,400,000)
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	1,425,000	$ 1,500,000
Securities Purchased under Agreements to Resell, Liability	(550,000)	(450,000)
Securities purchased under agreements to resell, net	875,000	1,050,000
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	(875,000)	(1,049,370)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	630
Repurchase agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	1,956,582	2,308,678
Securities Sold under Agreements to Repurchase, Asset	(550,000)	(450,000)
Securities sold under agreements to repurchase, net	1,406,582	1,858,678
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	(1,406,582)	(1,858,678)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0

Resale and Repurchase Agreem130

Resale and Repurchase Agreements Schedule of Underlying Assets of Repurchase Agreements (Details) $ in Thousands	Dec. 31, 2015USD ($)
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	$ 210,346
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	356,970
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	579,974
Maturity Overnight [Member] | Asset-backed Securities [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	212,000
Maturity Overnight [Member] | Repurchase Agreements [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,359,290
Maturity up to 90 days [Member] | US Treasury and Government [Member]
Schedule of Underlying Assets of Repurchase Agreements [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0
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
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	2,292
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	45,000
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	47,292
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	300,000
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	24,096
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	225,904
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
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	550,000
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	510,346
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	381,066
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	808,170
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	257,000
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	$ 1,956,582

Commitments, Contingencies A131

Commitments, Contingencies And Guarantees (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating leases, rent expense	$ 6,800	$ 6,700	$ 6,500
Commitments outstanding		324,817
Outstanding purchase commitments expected to fund in the next 12 months	67,400
Notional amount of underlying swaps	1,184,666	$ 797,030
Financial Standby Letter Of Credit [Member]
Carrying value of the guarantee obligations, liability	2,800
Commitments outstanding	311,844
State Tax Credits [Member]
Purchases of state tax credits	39,300
Sales of state tax credits	21,700
Risk Participation Agreement [Member]
Carrying value of the guarantee obligations, liability	195
Notional amount of underlying swaps	$ 58,500
Risk Participation Agreement [Member] | Minimum [Member]
Risk Participation Agreements, Term	3 years
Risk Participation Agreement [Member] | Maximum [Member]
Risk Participation Agreements, Term	11 years

Commitments, Contingencies A132

Commitments, Contingencies And Guarantees (Summary Of Minimum Lease Commitments) (Details) $ in Thousands	Dec. 31, 2015USD ($)
2,016	$ 5,633
2,017	4,932
2,018	3,942
2,019	2,761
2,020	1,844
After	13,023
Total minimum lease payments	32,135
Real Property [Member]
2,016	5,586
2,017	4,912
2,018	3,931
2,019	2,761
2,020	1,844
After	13,023
Equipment [Member]
2,016	47
2,017	20
2,018	11
2,019	0
2,020	0
After	$ 0

Commitments, Contingencies A133

Commitments, Contingencies And Guarantees (Schedule Of Off-Balance Sheet Instruments Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Standby letters of credit, net of participations		$ 324,817
Commercial letters of credit	$ 4,935	7,519
Credit Card [Member]
Commitments to extend credit	4,705,715	3,517,639
Other [Member]
Commitments to extend credit	$ 5,249,368	$ 4,922,748

Related Parties (Narrative) (De

Related Parties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015USD ($)$ / Square_Footshares	Dec. 31, 2014USD ($)$ / Square_Foot	Dec. 31, 2013USD ($)$ / Square_Foot
Tower Property [Member]
Percentage of Tower stock owned by the Company's Executive Officers	71.00%
Company stock owned by Tower | shares	245,485
Tower's long-term line of credit with the Bank	$ 13,500,000
Tower's maximum borrowing capacity on their line of credit	8,000,000
Tower's maximum amount outstanding on the line of credit during period	1,300,000	$ 3,000,000	$ 2,000,000
Tower's line of credit, current balance	0	1,300,000	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	$ 69,000	$ 69,000	$ 67,000
Rent per square foot | $ / Square_Foot	15.42	15.17	14.92
Chief Executive Officer [Member]
State tax credits sold by the Company to related party	$ 478,000	$ 396,000	$ 846,000
Former Chief Executive Officer [Member]
State tax credits sold by the Company to related party	40,000		282,000
Vice Chairman [Member]
State tax credits sold by the Company to related party	372,000	155,000	456,000
President [Member]
State tax credits sold by the Company to related party	$ 65,000	$ 60,000
Director [Member]
State tax credits sold by the Company to related party			$ 200,000

Related Parties (Schedule Of Re

Related Parties (Schedule Of Related Party Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total	$ 2,523	$ 2,947	$ 2,238
Leasing Agent Fees [Member]
Total	66	502	50
Operation Of Parking Garages [Member]
Total	75	86	84
Building Management Fees [Member]
Total	1,850	1,824	1,799
Property Construction Management Fees [Member]
Total	322	335	114
Dividends Paid On Company Stock Held By Tower [Member]
Total	$ 210	$ 200	$ 191

Parent Company Condensed Fin136

Parent Company Condensed Financial Statements (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments in marketable common and preferred stock	$ 41,003,000	$ 38,219,000
Non-agency mortgage-backed securities	879,963,000	382,744,000
Commerce Bancshares, Inc. (Parent) [Member]
Amount borrowed and repaid under line of credit	0	$ 0	$ 0
Parent's line of credit facility with the Bank, maximum borrowing capacity	20,000,000
Investments in marketable common and preferred stock	40,900,000
Non-agency mortgage-backed securities	11,100,000
Unrealized net gain in fair value Investment	36,000,000
Net of tax unrealized gain included in stockholders' equity	22,300,000
Unrealized net of tax gain in fair value of investment securities held by subsidiaries	$ 30,700,000

Parent Company Condensed Fin137

Parent Company Condensed Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available for sale securities	$ 9,777,004	$ 9,523,560
Non-marketable securities	112,786	106,875
Other assets	534,625	380,823
Total assets	24,604,962	23,994,280
Other liabilities	191,321	217,680
Total liabilities	22,237,544	21,660,034
Stockholders’ equity	2,361,990	2,330,193
Total liabilities and equity	24,604,962	23,994,280
Commerce Bancshares, Inc. (Parent) [Member]
Investment in consolidated subsidiary, Banks	2,147,284	2,069,369
Investment in consolidated subsidiaries, Non-banks	50,223	45,600
Cash	53	56
Securities purchased under agreements to resell	104,440	161,650
Available for sale securities	52,076	52,118
Non-marketable securities	1,787	1,787
Advances to subsidiaries, net of borrowings	18,560	19,731
Income tax benefits	8,444	3,848
Other assets	17,246	16,551
Total assets	2,400,113	2,370,710
Pension obligation	18,237	20,653
Other liabilities	19,886	19,864
Total liabilities	38,123	40,517
Stockholders’ equity	2,361,990	2,330,193
Total liabilities and equity	$ 2,400,113	$ 2,370,710

Parent Company Condensed Fin138

Parent Company Condensed Financial Statements (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest and dividends on investment securities	$ 191,801	$ 188,006	$ 189,415
Salaries and employee benefits	400,701	384,100	366,867
Data processing fees paid to affiliates	83,944	78,980	78,245
Other	76,161	79,332	71,638
Total non-interest expense	675,903	656,342	628,668
Income tax expense (benefit)	116,590	121,649	123,195
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	263,730	261,754	260,961
Commerce Bancshares, Inc. (Parent) [Member]
Dividends received from consolidated subsidiary banks	160,001	200,001	200,001
Dividends received from consolidated nonbank subsidiaries	0	34,000	390
Earnings of consolidated subsidiaries, net of dividends	106,636	32,493	62,815
Interest and dividends on investment securities	2,272	2,501	4,029
Management fees charged subsidiaries	25,713	25,806	20,701
Investment securities gains (losses)	0	204	1,294
Other	1,422	2,176	2,958
Total income	296,044	297,181	292,188
Salaries and employee benefits	22,167	26,030	20,433
Professional fees	1,833	2,363	3,538
Data processing fees paid to affiliates	3,186	3,030	2,775
Other	9,265	10,578	10,236
Total non-interest expense	36,451	42,001	36,982
Income tax expense (benefit)	(4,137)	(6,574)	(5,755)
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.	$ 263,730	$ 261,754	$ 260,961

Parent Company Condensed Fin139

Parent Company Condensed Financial Statements (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 266,975	$ 262,784	$ 261,117
Other changes, net	(11,189)	(3,242)	(12,494)
Net cash provided by (used in) operating activities	289,063	360,836	361,749
Proceeds from sales of available for sale securities	689,031	64,442	16,299
Proceeds from maturities/pay downs of available for sale securities	2,515,113	1,914,105	2,542,123
Purchases of investment securities	(3,542,537)	(2,498,090)	(2,411,153)
Purchases of land, buildings and equipment	(31,897)	(43,658)	(23,841)
Net cash provided by (used in) investing activities	(1,195,402)	(1,062,682)	(713,660)
Proceeds from issuance of preferred stock	0	144,784	0
Purchases of treasury stock	(23,176)	(70,974)	(69,353)
Net tax benefit related to equity compensation plans	2,132	1,850	1,003
Cash dividends paid on common stock	(84,961)	(84,241)	(82,104)
Cash dividends paid on preferred stock	(9,000)	(4,050)	0
Net cash provided by (used in) financing activities	308,341	533,049	841,600
Increase (decrease) in cash and cash equivalents	(597,998)	(168,797)	489,689
Cash and cash equivalents at beginning of year	1,100,717	1,269,514	779,825
Cash and cash equivalents at end of year	502,719	1,100,717	1,269,514
Income tax payments (receipts), net	95,341	120,172	114,336
Commerce Bancshares, Inc. (Parent) [Member]
Net income	263,730	261,754	260,961
Earnings of consolidated subsidiaries, net of dividends	(106,636)	(32,493)	(62,815)
Other changes, net	(3,284)	5,412	(139)
Net cash provided by (used in) operating activities	153,810	234,673	198,007
(Increase) decrease in securities purchased under agreements to resell	57,210	(19,000)	(74,975)
Decrease in investment in subsidiaries, net	(6)	357	151
Proceeds from sales of available for sale securities	0	157	866
Proceeds from maturities/pay downs of available for sale securities	3,516	5,852	13,644
Purchases of investment securities	(2,500)	0	0
(Increase) decrease in advances to subsidiaries, net	1,171	(17,959)	3,732
Purchases of land, buildings and equipment	(113)	(98)	(402)
Net cash provided by (used in) investing activities	59,278	(30,691)	(56,984)
Proceeds from issuance of preferred stock	0	144,784	0
Purchases of treasury stock	(23,176)	(70,974)	(69,353)
Accelerated stock repurchase agreement	(100,000)	(200,000)	0
Issuance under stock purchase and equity compensation plans	1,914	8,652	9,426
Net tax benefit related to equity compensation plans	2,132	1,850	1,003
Cash dividends paid on common stock	(84,961)	(84,241)	(82,104)
Cash dividends paid on preferred stock	(9,000)	(4,050)	0
Net cash provided by (used in) financing activities	(213,091)	(203,979)	(141,028)
Increase (decrease) in cash and cash equivalents	(3)	3	(5)
Cash and cash equivalents at beginning of year	56	53	58
Cash and cash equivalents at end of year	53	56	53
Income tax payments (receipts), net	$ 1,278	$ (8,209)	$ (6,933)