Commerce Bancshares (CBSH) 10-Q 7 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document And Entity Information [Abstract]
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Type	10-Q
Amendment Flag	false
Document Fiscal Period Focus	Q1
Entity Registrant Name	COMMERCE BANCSHARES INC /MO/
Current Fiscal Year End Date	--12-31
Entity Central Index Key	22,356
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		106,597,248

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Loans	$ 13,893,361	$ 13,983,674
Allowance for loan losses	(159,532)	(159,532)
Net loans	13,733,829	13,824,142
Loans held for sale	16,435	21,398
Investment securities:
Available-for-sale Securities, Debt Securities	8,432,180	8,725,442
Trading	32,025	18,269
Equity securities	51,512	50,591
Other securities	108,320	99,005
Total investment securities	8,624,037	8,893,307
Federal funds sold and short-term securities purchased under agreements to resell	17,000	42,775
Long-term securities purchased under agreements to resell	700,000	700,000
Interest earning deposits with banks	134,697	30,631
Cash and due from banks	423,048	438,439
Land, buildings and equipment, net	332,253	335,110
Goodwill	138,921	138,921
Other intangible assets, net	7,893	7,618
Other assets	483,129	401,074
Total assets	24,611,242	24,833,415
Deposits:
Non-interest bearing	6,953,430	7,158,962
Savings, interest checking and money market	11,828,138	11,499,620
Time open and C.D.'s of less than $100,000	615,401	634,646
Time open and C.D.'s, $100,000 or More	1,141,502	1,132,218
Total deposits	20,538,471	20,425,446
Federal funds purchased and securities sold under agreements to repurchase	1,132,329	1,507,138
Other Borrowings	9,214	1,758
Other liabilities	225,500	180,889
Total liabilities	21,905,514	22,115,231
Commerce Bancshares, Inc. stockholders' equity:
Preferred stock	144,784	144,784
Common stock	535,407	535,407
Capital surplus	1,802,785	1,815,360
Retained earnings	325,390	221,374
Treasury stock, at cost	(15,681)	(14,473)
Accumulated other comprehensive income	(89,563)	14,108
Total Commerce Bancshares, Inc. stockholders' equity	2,703,122	2,716,560
Non-controlling interest	2,606	1,624
Total equity	2,705,728	2,718,184
Total liabilities and equity	$ 24,611,242	$ 24,833,415

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 6,480,000	$ 15,327,000
Investment Securities:
Available-for-sale Securities Pledged as Collateral	$ 659,378,000	$ 662,515,000
Stockholders' Equity:
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	6,000	6,000
Common stock, par value	$ 5	$ 5
Common Stock, Shares Authorized	120,000,000	120,000,000
Common stock, shares issued	107,081,397	107,081,397
Treasury stock, shares	272,802	276,968

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Interest and fees on loans		$ 147,015	$ 128,323
Interest and fees on loans held for sale		304	196
Interest on investment securities		53,242	55,265
Interest on federal funds sold and short-term securities purchased under agreements to resell		180	23
Interest on long-term securities purchased under agreements to resell		4,114	3,793
Interest on deposits with banks		1,140	397
Total interest income		205,995	187,997
INTEREST EXPENSE
Savings, interest checking and money market		5,589	3,890
Time open and C.D.'s of less than $100,000		662	644
Time open and C.D.'s of $100,000 and over		2,839	2,763
Interest on federal funds purchased and securities sold under agreements to repurchase		4,001	1,539
Interest on other borrowings		12	888
Total interest expense		13,103	9,724
Net interest income		192,892	178,273
Provision for loan losses		10,396	11,128
Net interest income after provision for loan losses		182,496	167,145
NON-INTEREST INCOME
Bank card transaction fees		41,453	35,751
Trust fees		36,062	32,014
Deposit account charges and other fees		22,982	21,942
Capital market fees		2,291	2,342
Consumer brokerage services		3,768	3,649
Loan fees and sales		2,862	3,168
Other		10,272	10,747
Total non-interest income		119,690	109,613
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	[1]	5,410	(772)
NON-INTEREST EXPENSE
Salaries and employee benefits		115,894	112,369
Net occupancy		11,584	11,443
Equipment		4,431	4,609
Supplies and communication		5,313	5,709
Data processing and software		20,690	19,905
Marketing		4,805	3,224
Deposit insurance		3,457	3,471
Community Service		729	2,944
Other		15,374	15,703
Total non-interest expense		182,277	179,377
Income before income taxes		125,319	96,609
Less income taxes		23,258	24,907
Net income		102,061	71,702
Less non-controlling interest expense (income)		1,077	198
Net income attributable to Commerce Bancshares, Inc.		100,984	71,504
Preferred Stock Dividends		2,250	2,250
Net Income (Loss) Available to Common Stockholders		$ 98,734	$ 69,254
Net income per common share - basic		$ 0.92	$ 0.65
Net income per common share - diluted		$ 0.92	$ 0.65
[1]	Available for sale and non-marketable securities

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 102,061	$ 71,702
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	45	95
Net unrealized gains (losses) on other securities	(73,721)	19,002
Pension loss amortization	393	340
Other comprehensive income (loss), net of tax	(73,283)	19,437
Comprehensive income	28,778	91,139
Non-controlling interest expense (income)	1,077	198
Comprehensive income attributable to Commerce Bancshares, Inc	$ 27,701	$ 90,941

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interest [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member]	$ 1,297			$ 3,441	$ (2,144)
Balance at Dec. 31, 2016	2,501,132	$ 144,784	$ 510,015	1,552,454	292,849	$ (15,294)	$ 10,975	$ 5,349
Net income	71,702				71,504			198
Other comprehensive income (loss)	19,437						19,437
Distributions to non-controlling interest	(685)							(685)
Purchase of treasury stock	(7,284)					(7,284)
Issuance of stock under purchase and equity compensation plans	(6)			(14,996)		14,990
Stock-based compensation	3,135			3,135
Cash dividends per share, Common Stock, Cash	(22,913)				(22,913)
Dividends per share, Preferred Stock, Cash	(2,250)				(2,250)
Balance at Mar. 31, 2017	2,563,565	144,784	510,015	1,544,034	337,046	(7,588)	30,412	4,862
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]	0				(2,932)		2,932
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	0				33,320		(33,320)
Balance at Dec. 31, 2017	2,718,184	144,784	535,407	1,815,360	221,374	(14,473)	14,108	1,624
Net income	102,061				100,984			1,077
Other comprehensive income (loss)	(73,283)						(73,283)
Distributions to non-controlling interest	(95)							(95)
Purchase of treasury stock	(17,067)					(17,067)
Issuance of stock under purchase and equity compensation plans	(6)			(15,865)		15,859
Stock-based compensation	3,290			3,290
Cash dividends per share, Common Stock, Cash	(25,106)				(25,106)
Dividends per share, Preferred Stock, Cash	(2,250)				(2,250)
Balance at Mar. 31, 2018	$ 2,705,728	$ 144,784	$ 535,407	$ 1,802,785	$ 325,390	$ (15,681)	$ (89,563)	$ 2,606

Consolidated Statements Of Cha7

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, per share, cash paid	$ 0.235	$ 0.214
Preferred Stock, Dividends, per share, cash paid	$ 0.375	$ 0.375

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES:
Net income		$ 102,061	$ 71,702
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		10,396	11,128
Provision for depreciation and amortization		9,620	10,019
Amortization of investment security premiums, net		7,233	9,231
Investment securities gains (losses), net	[1]	(5,410)	772
Net gains on sales of loans held for sale		(1,147)	(866)
Origination of loans held for sale		(44,066)	(34,716)
Proceeds from sales and repayments of held for sale		49,255	34,446
Net (increase) decrease in trading securities, excluding unsettled transactions		(18,543)	7,763
Stock-based compensation		3,290	3,135
(Increase) decrease in interest receivable		744	(686)
Increase (decrease) in interest payable		(732)	39
Increase (decrease) in income taxes payable		22,076	21,156
Other changes, net		9,212	5,152
Net cash provided by (used in) operating activities		143,989	138,275
INVESTING ACTIVITIES:
Proceeds from sales of investment securities	[1]	148,652	98
Proceeds from maturities/pay downs of investment securities	[1]	358,690	483,090
Purchases of investment securities	[1]	(298,554)	(482,642)
Net (increase) decrease in loans		78,838	(169,185)
Purchases of land, buildings and equipment		(4,982)	(5,456)
Sales of land, buildings and equipment		718	717
Net cash provided by (used in) investing activities		283,362	(173,378)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		54,986	49,469
Net increase (decrease) in time open and C.D.'s		(9,961)	174,052
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase		(374,809)	(402,756)
Repayment of long-term borrowings		(74)	(74)
Proceeds from Short-term Debt		7,530	0
Purchases of treasury stock		(17,067)	(7,284)
Issuance of stock under equity compensation plans		(6)	(6)
Cash dividends paid on common stock		(25,106)	(22,913)
Cash dividends paid on preferred stock		(2,250)	(2,250)
Net cash provided by (used in) financing activities		(366,757)	(211,762)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect		60,594	(246,865)
Cash, cash equivalents and restricted cash at beginning of year		524,352	801,641
Cash, cash equivalents and restricted cash at March 31		584,946	554,776
Supplemental Cash Flow Information:
Income tax payments, net		147	2,850
Interest paid on deposits and borrowings		13,835	9,685
Loans transferred to foreclosed real estate		$ 1,028	$ 134
[1]	Available for sale and non-marketable securities

Consolidated Statements Of Cas9

Consolidated Statements Of Cash Flows Cash Flow Additional Information - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Restricted Cash and Cash Equivalents	$ 10.2	$ 16.2

Principles Of Consolidation And

Principles Of Consolidation And Presentation	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles Of Consolidation And Presentation	Principles of Consolidation and Presentation The accompanying consolidated financial statements include the accounts of Commerce Bancshares, Inc. and all majority-owned subsidiaries (the Company). Most of the Company's operations are conducted by its subsidiary bank, Commerce Bank (the Bank). The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, all adjustments necessary to present fairly the financial position and the results of operations for the interim periods have been made. All such adjustments are of a normal recurring nature. All significant intercompany accounts and transactions have been eliminated. Certain reclassifications were made to 2017 data to conform to current year presentation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Management has evaluated subsequent events for potential recognition or disclosure. The results of operations for the three month period ended March 31, 2018 are not necessarily indicative of results to be attained for the full year or any other interim period. The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission. Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Company's most recent Annual Report on Form 10-K, containing the latest audited consolidated financial statements and notes thereto. These financial statements reflect the adoption of several FASB Accounting Standards Updates (ASUs) on January 1, 2018. In some cases, the adoption of these ASUs resulted in changes to former accounting policies as described in Note 1 to the financial statements in the 2017 Annual Report on Form 10-K. The ASUs which affected the Company's 2018 financial statements include: • ASU 2014-09, Revenue from Contracts with Customers, which is discussed further in Note 13. • ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which is discussed further in Note 3 - Investment Securities, Note 8 - Accumulated Other Comprehensive Income, and Note 15 - Fair Value of Financial Instruments. • ASU 2016-18, Restricted Cash, which requires that the beginning and end of period amounts shown on the statement of cash flows include not only cash and cash equivalents, but also restricted cash and restricted cash equivalents, as considered such by the reporting entity. • ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which is discussed further in Note 6 - Pension. • ASU 2018-02, Reclassification for Certain Tax Effects from Accumulated Other Comprehensive Income, which is discussed further in Note 8 - Accumulated Other Comprehensive Income.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	3 Months Ended
	Mar. 31, 2018
Loans And Allowance For Loan Losses [Abstract]
Loans And Allowance For Loan Losses	Loans and Allowance for Loan Losses Major classifications within the Company’s held for investment loan portfolio at March 31, 2018 and December 31, 2017 are as follows: (In thousands) March 31, 2018 December 31, 2017 Commercial: Business $ 4,960,614 $ 4,958,554 Real estate – construction and land 932,058 968,820 Real estate – business 2,724,584 2,697,452 Personal Banking: Real estate – personal 2,069,012 2,062,787 Consumer 2,069,235 2,104,487 Revolving home equity 382,825 400,587 Consumer credit card 752,651 783,864 Overdrafts 2,382 7,123 Total loans $ 13,893,361 $ 13,983,674 At March 31, 2018 , loans of $3.7 billion were pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $1.7 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings. Allowance for loan losses A summary of the activity in the allowance for loan losses during the three months ended March 31, 2018 and 2017 , respectively, follows: For the Three Months Ended March 31 (In thousands) Commercial Personal Banking Total Balance at January 1 $ 93,704 $ 65,828 $ 159,532 Provision (894 ) 11,290 10,396 Deductions: Loans charged off 366 13,365 13,731 Less recoveries on loans 621 2,714 3,335 Net loan charge-offs (recoveries) (255 ) 10,651 10,396 Balance March 31, 2018 $ 93,065 $ 66,467 $ 159,532 Balance at January 1 $ 91,361 $ 64,571 $ 155,932 Provision 1,113 10,015 11,128 Deductions: Loans charged off 546 12,330 12,876 Less recoveries on loans 1,023 2,625 3,648 Net loan charge-offs (recoveries) (477 ) 9,705 9,228 Balance March 31, 2017 $ 92,951 $ 64,881 $ 157,832 The following table shows the balance in the allowance for loan losses and the related loan balance at March 31, 2018 and December 31, 2017 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under Accounting Standards Codification (ASC) 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans discussed below, which are deemed to have similar risk characteristics and 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 March 31, 2018 Commercial $ 2,391 $ 82,699 $ 90,674 $ 8,534,557 Personal Banking 1,107 20,828 65,360 5,255,277 Total $ 3,498 $ 103,527 $ 156,034 $ 13,789,834 December 31, 2017 Commercial $ 3,067 $ 92,613 $ 90,637 $ 8,532,213 Personal Banking 1,176 22,182 64,652 5,336,666 Total $ 4,243 $ 114,795 $ 155,289 $ 13,868,879 Impaired loans The table below shows the Company’s investment in impaired loans at March 31, 2018 and December 31, 2017 . These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings. 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 14. (In thousands) Mar. 31, 2018 Dec. 31, 2017 Non-accrual loans $ 10,277 $ 11,983 Restructured loans (accruing) 93,250 102,812 Total impaired loans $ 103,527 $ 114,795 The following table provides additional information about impaired loans held by the Company at March 31, 2018 and December 31, 2017 , segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided. (In thousands) Recorded Investment Unpaid Principal Balance Related Allowance March 31, 2018 With no related allowance recorded: Business $ 5,221 $ 9,000 $ — Real estate – business 1,299 1,303 — $ 6,520 $ 10,303 $ — With an allowance recorded: Business $ 64,228 $ 64,448 $ 1,905 Real estate – construction and land 1,458 1,462 42 Real estate – business 10,493 11,021 444 Real estate – personal 8,589 11,412 415 Consumer 5,415 5,415 52 Revolving home equity 153 153 17 Consumer credit card 6,671 6,671 623 $ 97,007 $ 100,582 $ 3,498 Total $ 103,527 $ 110,885 $ 3,498 December 31, 2017 With no related allowance recorded: Business $ 5,356 $ 9,000 $ — Real estate – business 1,299 1,303 — Consumer 779 817 — $ 7,434 $ 11,120 $ — With an allowance recorded: Business $ 72,589 $ 73,168 $ 2,455 Real estate – construction and land 837 841 27 Real estate – business 12,532 13,071 585 Real estate – personal 9,126 11,914 532 Consumer 5,388 5,426 67 Revolving home equity 204 204 11 Consumer credit card 6,685 6,685 566 $ 107,361 $ 111,309 $ 4,243 Total $ 114,795 $ 122,429 $ 4,243 Total average impaired loans for the three month periods ended March 31, 2018 and 2017 , respectively, are shown in the table below. (In thousands) Commercial Personal Banking Total Average Impaired Loans: For the three months ended March 31, 2018 Non-accrual loans $ 8,523 $ 2,928 $ 11,451 Restructured loans (accruing) 79,258 18,773 98,031 Total $ 87,781 $ 21,701 $ 109,482 For the three months ended March 31, 2017 Non-accrual loans $ 10,613 $ 3,509 $ 14,122 Restructured loans (accruing) 31,885 16,204 48,089 Total $ 42,498 $ 19,713 $ 62,211 The table below shows interest income recognized during the three month periods ended March 31, 2018 and 2017 , respectively, for impaired loans held at the end of each period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section on page 14. For the Three Months Ended March 31 (In thousands) 2018 2017 Interest income recognized on impaired loans: Business $ 760 $ 263 Real estate – construction and land 24 1 Real estate – business 113 62 Real estate – personal 111 37 Consumer 80 82 Revolving home equity 2 6 Consumer credit card 128 135 Total $ 1,218 $ 586 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 March 31, 2018 and December 31, 2017 . (In thousands) Current or Less Than 30 Days Past Due 30 – 89 Days Past Due 90 Days Past Due and Still Accruing Non-accrual Total March 31, 2018 Commercial: Business $ 4,928,806 $ 25,792 $ 459 $ 5,557 $ 4,960,614 Real estate – construction and land 929,113 2,940 — 5 932,058 Real estate – business 2,717,484 4,554 — 2,546 2,724,584 Personal Banking: Real estate – personal 2,059,965 5,962 916 2,169 2,069,012 Consumer 2,044,135 22,374 2,726 — 2,069,235 Revolving home equity 379,309 2,277 1,239 — 382,825 Consumer credit card 734,498 8,565 9,588 — 752,651 Overdrafts 2,123 259 — — 2,382 Total $ 13,795,433 $ 72,723 $ 14,928 $ 10,277 $ 13,893,361 December 31, 2017 Commercial: Business $ 4,949,148 $ 3,085 $ 374 $ 5,947 $ 4,958,554 Real estate – construction and land 967,321 1,473 21 5 968,820 Real estate – business 2,694,234 482 — 2,736 2,697,452 Personal Banking: Real estate – personal 2,050,787 6,218 3,321 2,461 2,062,787 Consumer 2,067,025 32,674 3,954 834 2,104,487 Revolving home equity 397,349 1,962 1,276 — 400,587 Consumer credit card 764,568 10,115 9,181 — 783,864 Overdrafts 6,840 283 — — 7,123 Total $ 13,897,272 $ 56,292 $ 18,127 $ 11,983 $ 13,983,674 The increase in business loans which were delinquent 30-89 days relates to one borrower who was past due at March 31, 2018 but has subsequently brought the loan to a current status. Credit quality The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is applied to loans where the borrower exhibits negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Commercial Loans (In thousands) Business Real Estate-Construction Real Estate- Business Total March 31, 2018 Pass $ 4,716,879 $ 919,050 $ 2,632,074 $ 8,268,003 Special mention 88,442 10,694 50,925 150,061 Substandard 149,736 2,309 39,039 191,084 Non-accrual 5,557 5 2,546 8,108 Total $ 4,960,614 $ 932,058 $ 2,724,584 $ 8,617,256 December 31, 2017 Pass $ 4,740,013 $ 955,499 $ 2,593,005 $ 8,288,517 Special mention 59,177 10,614 50,577 120,368 Substandard 153,417 2,702 51,134 207,253 Non-accrual 5,947 5 2,736 8,688 Total $ 4,958,554 $ 968,820 $ 2,697,452 $ 8,624,826 The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above "Delinquent and non-accrual loans" section. In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a borrower's financial history. The Bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because they generally pertain to commercial customer activities and are often underwritten with other collateral considerations. These loans totaled $216.2 million at March 31, 2018 and $219.2 million at December 31, 2017 . The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $148.9 million at March 31, 2018 and $145.0 million at December 31, 2017 . As the healthcare loans are guaranteed by the hospital, FICO scores are not considered relevant for this program. The personal real estate loans and consumer loans excluded below totaled less than 7% of the Personal Banking portfolio. For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at March 31, 2018 and December 31, 2017 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card March 31, 2018 FICO score: Under 600 1.3 % 3.5 % 1.1 % 5.2 % 600 - 659 1.7 5.3 1.7 15.1 660 - 719 10.0 17.3 9.1 36.1 720 - 779 26.0 26.9 23.2 25.6 780 and over 61.0 47.0 64.9 18.0 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2017 FICO score: Under 600 1.3 % 3.3 % 1.1 % 4.7 % 600 - 659 2.1 5.5 1.7 14.4 660 - 719 10.5 17.3 9.5 34.4 720 - 779 25.6 26.8 21.4 26.0 780 and over 60.5 47.1 66.3 20.5 Total 100.0 % 100.0 % 100.0 % 100.0 % Troubled debt restructurings As mentioned previously, the Company's impaired loans include loans which have been classified as troubled debt restructurings, as shown in the table below. Restructured loans are those extended to borrowers who are experiencing financial difficulty and who have been granted a concession. Restructured loans are placed on non-accrual status if the Company does not believe it probable that amounts due under the contractual terms will be collected. Other performing restructured loans are 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 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. 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 classified certain loans as troubled debt restructings because they were not reaffirmed by the borrower in bankruptcy proceedings. These loans are comprised of personal real estate, revolving home equity and consumer loans. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments. (In thousands) March 31, 2018 December 31, 2017 Accruing loans: Non-market interest rates $ 77,922 $ 88,588 Assistance programs 6,671 6,685 Bankruptcy non-affirmation 8,386 7,283 Other 271 256 Non-accrual loans 7,619 7,796 Total troubled debt restructurings $ 100,869 $ 110,608 The table below shows the balance of troubled debt restructurings by loan classification at March 31, 2018 , in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal. (In thousands) March 31, 2018 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 69,156 $ 43 Real estate - construction and land 1,399 — Real estate - business 10,546 1,299 Personal Banking: Real estate - personal 7,476 389 Consumer 5,469 106 Revolving home equity 152 74 Consumer credit card 6,671 744 Total troubled debt restructurings $ 100,869 $ 2,655 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. The effects of modifications to consumer credit card loans were estimated to decrease interest income by approximately $896 thousand 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 begun. The Company had commitments of $10.6 million at March 31, 2018 to lend additional funds to borrowers with restructured loans. Loans held for sale The Company designates certain long-term fixed rate personal real estate loans as held for sale, and the Company has elected the fair value option for these loans. The election of the fair value option aligns the accounting for these loans with the related economic hedges discussed in Note 10. The loans are primarily sold to FNMA, FHLMC, and GNMA. At March 31, 2018 , the fair value of these loans was $6.5 million , and the unpaid principal balance was $6.3 million . The Company also designates student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans within 210 days after the last disbursement to the student. These loans are carried at lower of cost or fair value, which at March 31, 2018 totaled $10.0 million . At March 31, 2018 , none of the loans held for sale were on non-accrual status or 90 days past due and still accruing. Foreclosed real estate/repossessed assets The Company’s holdings of foreclosed real estate totaled $1.3 million and $681 thousand at March 31, 2018 and December 31, 2017 , respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $3.1 million and $2.7 million at March 31, 2018 and December 31, 2017 , respectively. Upon acquisition, these assets are recorded at fair value less estimated selling costs at the date of foreclosure, establishing a new cost basis. They are subsequently carried at the lower of this cost basis or fair value less estimated selling costs.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2018
Investment Securities [Abstract]
Investment Securities	Investment Securities Investment securities as shown in this report reflect revised categories as required by the Company’s adoption of ASU 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities”, on January 1, 2018. That new guidance refined the definition of equity securities and required their segregation from available for sale debt securities. For comparability purposes, prior period disclosures in this report have been revised to show the new categorization. March 31, 2018 December 31, 2017 Available for sale debt securities $ 8,432,180 $ 8,725,442 Trading debt securities 32,025 18,269 Equity securities: Readily determinable fair value 49,784 48,838 No readily determinable fair value 1,728 1,753 Other: Federal Reserve Bank stock 33,369 33,253 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 64,951 55,752 Total investment securities $ 8,624,037 $ 8,893,307 While changes in the fair value of available for sale debt securities continue to be recorded in the equity category of accumulated other comprehensive income, the new guidance requires changes in the fair value of equity securities to be recorded in current earnings. As required by the new guidance, the unrealized gain in fair value on equity securities (recorded in accumulated other comprehensive income at December 31, 2017) was reclassified to retained earnings on January 1, 2018. The amount of the reclassification was $33.3 million , net of tax. Equity securities include common and preferred stock with readily determinable fair values that totaled $4.4 million at cost and $49.8 million at fair value at March 31, 2018 . The majority of these securities are expected to be redeemed for cash in a third party merger transaction expected to occur by the end of the third quarter of 2018. The portion of unrealized net gains on equity securities recognized in current earnings during the first quarter of 2018 , which related to securities still held at March 31, 2018 , totaled $947 thousand . Equity securities also include securities with a carrying value of $1.7 million that do not have readily determinable fair values. The Company has elected, under the ASU, to measure these at cost minus impairment, if any, plus or minus changes resulting from observable price changes for the identical or similar investment of the same issuer. The Company did not record any impairment or other adjustments to the carrying amount of these investments during the period. Other investment securities whose accounting is not addressed in the ASU include Federal Reserve Bank (FRB) stock, Federal Home Loan Bank (FHLB) stock, and investments in portfolio concerns held by the Company's private equity subsidiaries. FRB stock and FHLB stock are held for debt and regulatory purposes. Investment in FRB stock is based on the capital structure of the investing bank, and investment in FHLB stock is tied to the level of borrowings from the FHLB. These holdings are carried at cost. The private equity investments, in the absence of readily ascertainable market values, are carried at estimated fair value. The majority of the Company’s investment portfolio is comprised of available for sale debt securities, which are carried at fair value with changes in fair value reported in accumulated other comprehensive income. A summary of the available for sale debt securities by maturity groupings as of March 31, 2018 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as the FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral. (In thousands) Amortized Cost Fair Value U.S. government and federal agency obligations: Within 1 year $ 52,205 $ 52,521 After 1 but within 5 years 644,016 636,542 After 5 but within 10 years 156,769 154,484 After 10 years 68,835 68,376 Total U.S. government and federal agency obligations 921,825 911,923 Government-sponsored enterprise obligations: Within 1 year 193,937 193,623 After 1 but within 5 years 121,580 120,181 After 5 but within 10 years 34,983 34,152 After 10 years 42,831 40,643 Total government-sponsored enterprise obligations 393,331 388,599 State and municipal obligations: Within 1 year 157,082 157,746 After 1 but within 5 years 567,474 569,318 After 5 but within 10 years 649,164 646,866 After 10 years 43,729 42,915 Total state and municipal obligations 1,417,449 1,416,845 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,003,975 2,954,994 Non-agency mortgage-backed securities 966,401 960,612 Asset-backed securities 1,476,947 1,466,035 Total mortgage and asset-backed securities 5,447,323 5,381,641 Other debt securities: Within 1 year 3,999 3,981 After 1 but within 5 years 262,778 258,315 After 5 but within 10 years 73,723 70,876 Total other debt securities 340,500 333,172 Total available for sale debt securities $ 8,520,428 $ 8,432,180 Investments in U.S. government and federal agency obligations include U.S. Treasury inflation-protected securities, which totaled $442.4 million , at fair value, at March 31, 2018 . Interest paid on these securities increases with inflation and decreases with deflation, as measured by the Consumer Price Index. Included in state and municipal obligations are $17.2 million , at fair value, of auction rate securities, which were purchased from bank customers in 2008. Interest on these bonds is currently being paid at the maximum failed auction rates. For debt securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type. (In thousands) Amortized Cost Gross Gross Fair Value March 31, 2018 U.S. government and federal agency obligations $ 921,825 $ 1,617 $ (11,519 ) $ 911,923 Government-sponsored enterprise obligations 393,331 — (4,732 ) 388,599 State and municipal obligations 1,417,449 7,572 (8,176 ) 1,416,845 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,003,975 8,074 (57,055 ) 2,954,994 Non-agency mortgage-backed securities 966,401 6,530 (12,319 ) 960,612 Asset-backed securities 1,476,947 2,323 (13,235 ) 1,466,035 Total mortgage and asset-backed securities 5,447,323 16,927 (82,609 ) 5,381,641 Other debt securities 340,500 9 (7,337 ) 333,172 Total $ 8,520,428 $ 26,125 $ (114,373 ) $ 8,432,180 December 31, 2017 U.S. government and federal agency obligations $ 917,494 $ 4,096 $ (4,443 ) $ 917,147 Government-sponsored enterprise obligations 408,266 26 (1,929 ) 406,363 State and municipal obligations 1,592,707 21,413 (2,754 ) 1,611,366 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,046,701 17,956 (23,744 ) 3,040,913 Non-agency mortgage-backed securities 903,920 6,710 (4,837 ) 905,793 Asset-backed securities 1,495,380 2,657 (5,237 ) 1,492,800 Total mortgage and asset-backed securities 5,446,001 27,323 (33,818 ) 5,439,506 Other debt securities 350,988 1,250 (1,178 ) 351,060 Total $ 8,715,456 $ 54,108 $ (44,122 ) $ 8,725,442 The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis and analysis is placed on securities whose credit rating has fallen below 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 who have been identified based on management’s judgment. These securities are placed on a watch list, and for all such securities, cash flow analyses are prepared. For more complex analyses, 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 March 31, 2018 , the fair value of securities on this watch list was $62.8 million compared to $68.0 million at December 31, 2017 . As of March 31, 2018 , the Company had recorded other-than-temporary impairment (OTTI) on certain non-agency mortgage-backed securities, part of the watch list mentioned above, which had an aggregate fair value of $24.8 million . The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $14.2 million . The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost. The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities at March 31, 2018 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 15% - 52% Credit support 0% - 63% Loss severity 15% - 63% The following table presents a rollforward of the cumulative OTTI credit losses recognized in earnings on all available for sale debt securities. For the Three Months Ended March 31 (In thousands) 2018 2017 Cumulative OTTI credit losses at January 1 $ 14,199 $ 14,080 Credit losses on debt securities for which impairment was not previously recognized 58 — Credit losses on debt securities for which impairment was previously recognized 10 109 Increase in expected cash flows that are recognized over remaining life of security (54 ) (73 ) Cumulative OTTI credit losses at March 31 $ 14,213 $ 14,116 Debt securities with unrealized losses recorded in accumulated other comprehensive income are shown in the table below, along with the length of the impairment period. Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses March 31, 2018 U.S. government and federal agency obligations $ 653,945 $ 9,647 $ 59,435 $ 1,872 $ 713,380 $ 11,519 Government-sponsored enterprise obligations 338,752 4,588 49,847 144 388,599 4,732 State and municipal obligations 529,699 6,427 44,474 1,749 574,173 8,176 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,922,859 35,455 591,341 21,600 2,514,200 57,055 Non-agency mortgage-backed securities 729,615 9,447 137,775 2,872 867,390 12,319 Asset-backed securities 884,800 11,101 207,087 2,134 1,091,887 13,235 Total mortgage and asset-backed securities 3,537,274 56,003 936,203 26,606 4,473,477 82,609 Other debt securities 305,412 6,462 19,779 875 325,191 7,337 Total $ 5,365,082 $ 83,127 $ 1,109,738 $ 31,246 $ 6,474,820 $ 114,373 December 31, 2017 U.S. government and federal agency obligations $ 618,617 $ 4,443 $ — $ — $ 618,617 $ 4,443 Government-sponsored enterprise obligations 286,393 1,712 49,766 217 336,159 1,929 State and municipal obligations 282,843 1,752 49,339 1,002 332,182 2,754 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,320,689 9,433 619,300 14,311 1,939,989 23,744 Non-agency mortgage-backed securities 577,017 2,966 153,813 1,871 730,830 4,837 Asset-backed securities 786,048 3,168 264,295 2,069 1,050,343 5,237 Total mortgage and asset-backed securities 2,683,754 15,567 1,037,408 18,251 3,721,162 33,818 Other debt securities 144,090 727 20,202 451 164,292 1,178 Total $ 4,015,697 $ 24,201 $ 1,156,715 $ 19,921 $ 5,172,412 $ 44,122 The available for sale debt portfolio included $6.5 billion of securities that were in a loss position at March 31, 2018, compared to $5.2 billion at December 31, 2017. The total amount of unrealized loss on these securities was $114.4 million at March 31, 2018, an increase of $70.3 million compared to the loss at December 31, 2017. This increase in losses was mainly due to a rising rate environment. The following tables present proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Three Months Ended March 31 (In thousands) 2018 2017 Proceeds from sales of securities: Available for sale debt securities $ 148,637 $ — Equity securities 15 — Other — 98 Total proceeds $ 148,652 $ 98 Investment securities gains (losses), net: Available for sale debt securities: Gains realized on sales $ 212 $ — Gains realized on donations of securities — 2,157 Other-than-temporary impairment recognized on debt securities (68 ) (109 ) Equity securities: Gains realized on sales 14 — Fair value adjustments, net 947 — Other: Gains realized on sales — 58 Fair value adjustments, net 4,305 (2,878 ) Total investment securities gains (losses), net $ 5,410 $ (772 ) At March 31, 2018 , securities totaling $3.7 billion in fair value were pledged to secure public fund deposits, securities sold under agreements to repurchase, trust funds, and borrowings at the FRB and FHLB. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $659.4 million , while the remaining securities were pledged under agreements pursuant to which the secured parties may not sell or re-pledge the collateral. Except for obligations of various government-sponsored enterprises such as FNMA, FHLB and FHLMC, no investment in a single issuer exceeded 10% of stockholders’ equity.

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets	Goodwill and Other Intangible Assets The following table presents information about the Company's intangible assets which have estimable useful lives. March 31, 2018 December 31, 2017 (In thousands) Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Amortizable intangible assets: Core deposit premium $ 31,270 $ (28,482 ) $ — $ 2,788 $ 31,270 $ (28,305 ) $ — $ 2,965 Mortgage servicing rights 8,493 (3,388 ) — 5,105 7,906 (3,244 ) (9 ) 4,653 Total $ 39,763 $ (31,870 ) $ — $ 7,893 $ 39,176 $ (31,549 ) $ (9 ) $ 7,618 Aggregate amortization expense on intangible assets was $321 thousand and $348 thousand for the three month periods ended March 31, 2018 and 2017 , respectively. The following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of March 31, 2018 . The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. (In thousands) 2018 $ 1,202 2019 1,043 2020 893 2021 777 2022 684 Changes in the carrying amount of goodwill and net other intangible assets for the three month period ended March 31, 2018 are as follows: (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance January 1, 2018 $ 138,921 $ 2,965 $ 4,653 Originations — — 587 Amortization — (177 ) (144 ) Impairment reversal — — 9 Balance March 31, 2018 $ 138,921 $ 2,788 $ 5,105 Goodwill allocated to the Company’s operating segments at March 31, 2018 and December 31, 2017 is shown below. (In thousands) Consumer segment $ 70,721 Commercial segment 67,454 Wealth segment 746 Total goodwill $ 138,921

Guarantees

Guarantees	3 Months Ended
	Mar. 31, 2018
Guarantees [Abstract]
Guarantees	Guarantees The Company, as a provider of financial services, routinely issues financial guarantees in the form of financial and performance standby letters of credit. Standby letters of credit are contingent commitments issued by the Company generally to guarantee the payment or performance obligation of a customer to a third party. While these represent a potential outlay by the Company, a significant amount of the commitments may expire without being drawn upon. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit. The letters of credit are subject to the same credit policies, underwriting standards and approval process as loans made by the Company. Most of the standby letters of credit are secured, and in the event of nonperformance by customers, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities. Upon issuance of standby letters of credit, the Company recognizes a liability for the fair value of the obligation undertaken, which is estimated to be equivalent to the amount of fees received from the customer over the life of the agreement. At March 31, 2018 , that net liability was $2.3 million , which will be accreted into income over the remaining life of the respective commitments. The contractual amount of these letters of credit, which represents the maximum potential future payments guaranteed by the Company, was $389.6 million at March 31, 2018 . The Company periodically enters into credit risk participation agreements (RPAs) as a guarantor to other financial institutions, in order to mitigate those institutions’ credit risk associated with interest rate swaps with third parties. The RPA stipulates that, in the event of default by the third party on the interest rate swap, the Company will reimburse a portion of the loss borne by the financial institution. These interest rate swaps are normally collateralized (generally with real property, inventories and equipment) by the third party, which limits the credit risk associated with the Company’s RPAs. The third parties usually have other borrowing relationships with the Company. The Company monitors overall borrower collateral and at March 31, 2018 , believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 2 to 11 years. At March 31, 2018 , the fair value of the Company's guarantee liabilities for RPAs was $91 thousand , and the notional amount of the underlying swaps was $103.9 million . The maximum potential future payment guaranteed by the Company cannot be readily estimated but is dependent upon the fair value of the interest rate swaps at the time of default.

Pension

Pension	3 Months Ended
	Mar. 31, 2018
Pension [Abstract]
Pension	Pension The amount of net pension cost is shown in the table below: For the Three Months Ended March 31 (In thousands) 2018 2017 Service cost - benefits earned during the period $ 153 $ 129 Interest cost on projected benefit obligation 950 973 Expected return on plan assets (1,437 ) (1,438 ) Amortization of prior service cost (68 ) (68 ) Amortization of unrecognized net loss 592 617 Net periodic pension cost $ 190 $ 213 Substantially all benefits accrued under the Company’s defined benefit pension plan were frozen effective January 1, 2005, and the remaining benefits were frozen effective January 1, 2011. During the first three months of 2018 , the Company made no funding contributions to its defined benefit pension plan and made minimal funding contributions to a supplemental executive retirement plan (the CERP), which carries no segregated assets. The Company has no plans to make any further contributions, other than those related to the CERP, during the remainder of 2018 . The Company adopted ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost”, on January 1, 2018. This guidance requires that the service cost component of net periodic pension cost be reported in the same income statement line item as other compensation costs, while other components of net periodic pension cost be reported separately from the service cost component. Historically, the Company has reported all components of pension cost in salaries and employee benefits. Beginning in 2018, only the service cost component has been included in this category, and the other components have been recorded in other non-interest expense. Prior period financial statements have not been revised because the amount of the reclassification was not significant.

Common Stock

Common Stock	3 Months Ended
	Mar. 31, 2018
Common Stock [Abstract]
Common Stock	Common Stock * Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 12. For the Three Months Ended March 31 (In thousands, except per share data) 2018 2017 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 100,984 $ 71,504 Less preferred stock dividends 2,250 2,250 Net income available to common shareholders 98,734 69,254 Less income allocated to nonvested restricted stock 1,121 945 Net income allocated to common stock $ 97,613 $ 68,309 Weighted average common shares outstanding 105,634 105,389 Basic income per common share $ .92 $ .65 Diluted income per common share: Net income available to common shareholders $ 98,734 $ 69,254 Less income allocated to nonvested restricted stock 1,118 942 Net income allocated to common stock $ 97,616 $ 68,312 Weighted average common shares outstanding 105,634 105,389 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 332 416 Weighted average diluted common shares outstanding 105,966 105,805 Diluted income per common share $ .92 $ .65 Unexercised stock appreciation rights of 264 thousand and 90 thousand were excluded in the computation of diluted income per common share for the three month periods ended March 31, 2018 and 2017 , respectively, because their inclusion would have been anti-dilutive. * All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2017.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2018
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 debt securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. The other component is the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. Unrealized Gains (Losses) on Securities (1) Pension Loss Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 2018 $ 3,411 $ 30,326 $ (19,629 ) $ 14,108 ASU 2018-02 Reclassification of tax rate change 715 6,359 (4,142 ) 2,932 ASU 2016-01 Reclassification of unrealized gain on equity securities — (33,320 ) — (33,320 ) Other comprehensive income (loss) before reclassifications to current earnings (8 ) (98,081 ) — (98,089 ) Amounts reclassified to current earnings from accumulated other comprehensive income 68 (212 ) 524 380 Current period other comprehensive income (loss), before tax 60 (98,293 ) 524 (97,709 ) Income tax (expense) benefit (15 ) 24,572 (131 ) 24,426 Current period other comprehensive income (loss), net of tax 45 (73,721 ) 393 (73,283 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 12 (12 ) — — Balance March 31, 2018 $ 4,183 $ (70,368 ) $ (23,378 ) $ (89,563 ) Balance January 1, 2017 $ 2,975 $ 27,328 $ (19,328 ) $ 10,975 Other comprehensive income before reclassifications to current earnings 44 32,805 — 32,849 Amounts reclassified to current earnings from accumulated other comprehensive income 109 (2,157 ) 549 (1,499 ) Current period other comprehensive income, before tax 153 30,648 549 31,350 Income tax expense (58 ) (11,646 ) (209 ) (11,913 ) Current period other comprehensive income, net of tax 95 19,002 340 19,437 Balance March 31, 2017 $ 3,070 $ 46,330 $ (18,988 ) $ 30,412 (1) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income. The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (as shown in the table above) to retained earnings. As mentioned in Note 3, additional new accounting guidance, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income to retained earnings (also shown above).

Segments

Segments	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segments	Segments The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial and Wealth. The Consumer segment consists of various consumer loan and deposit products offered through its retail branch network of approximately 180 locations. This segment also includes indirect and other consumer loan financing businesses, along with debit and credit card loan and fee businesses. Residential mortgage origination, sales and servicing functions are included in this Consumer segment, but residential mortgage loans retained by the Company are not considered part of this segment. The Commercial segment provides corporate lending, leasing, and international services, along with business and governmental deposit products and commercial cash management services. This segment includes both merchant and commercial bank card products. It also includes the Capital Markets Group which sells fixed income securities and provides safekeeping and accounting services to its business and correspondent bank customers. The Wealth segment provides traditional trust and estate planning, advisory and discretionary investment management, and brokerage services. This segment also provides various loan and deposit related services to its private banking customers. The following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below. (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Three Months Ended March 31, 2018 Net interest income $ 71,437 $ 82,095 $ 11,445 $ 164,977 $ 27,915 $ 192,892 Provision for loan losses (10,515 ) 180 (64 ) (10,399 ) 3 (10,396 ) Non-interest income 30,216 49,211 42,101 121,528 (1,838 ) 119,690 Investment securities gains, net — — — — 5,410 5,410 Non-interest expense (70,171 ) (72,798 ) (31,859 ) (174,828 ) (7,449 ) (182,277 ) Income before income taxes $ 20,967 $ 58,688 $ 21,623 $ 101,278 $ 24,041 $ 125,319 Three Months Ended March 31, 2017 Net interest income $ 67,354 $ 79,870 $ 11,844 $ 159,068 $ 19,205 $ 178,273 Provision for loan losses (9,662 ) 513 (23 ) (9,172 ) (1,956 ) (11,128 ) Non-interest income 27,163 44,910 37,706 109,779 (166 ) 109,613 Investment securities losses, net — — — — (772 ) (772 ) Non-interest expense (67,417 ) (70,365 ) (30,319 ) (168,101 ) (11,276 ) (179,377 ) Income before income taxes $ 17,438 $ 54,928 $ 19,208 $ 91,574 $ 5,035 $ 96,609 The information presented above was derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. This information is based on internal management accounting procedures and methods, which have been developed to reflect the underlying economics of the businesses. The methodologies are applied in connection with funds transfer pricing and assignment of overhead costs among segments. Funds transfer pricing was used in the determination of net interest income by assigning a standard cost (credit) for funds used (provided) by assets and liabilities based on their maturity, prepayment and/or repricing characteristics. The segment activity, as shown above, includes both direct and allocated items. Amounts in the “Other/Elimination” column include activity not related to the segments, such as that relating to administrative functions, the investment securities portfolio, and the effect of certain expense allocations to the segments. The provision for 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. The performance measurement of the operating segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments' financial condition and results of operations if they were independent entities.

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instrument Detail [Abstract]
Derivative Instruments	Derivative Instruments The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. The Company’s derivative instruments are accounted for as free-standing derivatives, and changes in their fair value are recorded in current earnings. (In thousands) March 31, 2018 December 31, 2017 Interest rate swaps $ 1,787,029 $ 1,741,412 Interest rate caps 31,630 31,776 Credit risk participation agreements 153,219 133,488 Foreign exchange contracts 10,907 11,826 Mortgage loan commitments 16,297 17,110 Mortgage loan forward sale contracts 688 2,566 Forward TBA contracts 16,500 25,000 Total notional amount $ 2,016,270 $ 1,963,178 The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. 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 regulated clearinghouse who becomes the Company's legal counterparty. Because of the matching terms of the offsetting contracts, in addition to collateral provisions which mitigate the impact of non-performance risk, changes in fair value subsequent to initial recognition have a minimal effect on earnings. Many of the Company’s interest rate swap contracts with large financial institutions contain contingent features relating to debt ratings or capitalization levels. Under these provisions, if the Company’s debt rating falls below investment grade or if the Company ceases to be “well-capitalized” under risk-based capital guidelines, certain counterparties can require immediate and ongoing collateralization on interest rate swaps in net liability positions or instant settlement of the contracts. The Company maintains debt ratings and capital well above these minimum requirements. The Company also contracts with other financial institutions, as a guarantor or beneficiary, to share credit risk associated with certain interest rate swaps through risk participation agreements. The Company’s risks and responsibilities as guarantor are further discussed in Note 5 on Guarantees. In addition, the Company enters into foreign exchange contracts, which are mainly comprised of contracts to purchase or deliver foreign currencies for customers at specific future dates. Under its program to sell residential mortgage loans in the secondary market, the Company designates certain newly-originated residential mortgage loans as held for sale. Derivative instruments arising from this activity include mortgage loan commitments and forward loan sale commitments. Changes in the fair values of the loan commitments and funded loans prior to sale that are due to changes in interest rates are economically hedged with forward contracts to sell residential mortgage-backed securities in the to-be-announced (TBA) market. These forward TBA contracts are also considered to be derivatives and are settled in cash at the security settlement date. The fair values of the Company's derivative instruments, whose notional amounts are listed above, are shown in the table below. Information about the valuation methods used to determine fair value is provided in Note 15 on Fair Value Measurements in the 2017 Annual Report on Form 10-K. The Company's policy is to present its derivative assets and derivative liabilities on a gross basis in its consolidated balance sheets, and these are reported in other assets and other liabilities. However, in January 2017, a clearinghouse rule change required that variation margin on centrally cleared derivatives, formerly treated as collateral, be treated as settlements of derivative exposure. As a result, the fair values of the respective derivative contracts must be reduced by variation margin payments and reported as a single, net amount. Accordingly, at March 31, 2018 in the table below, the positive fair values of cleared swaps were reduced by $12.2 million and the negative fair values of cleared swaps were reduced by $484 thousand . At December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million . Asset Derivatives Liability Derivatives Mar. 31, 2018 Dec. 31, 2017 Mar. 31, 2018 Dec. 31, 2017 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 4,403 $ 7,674 $ (16,120 ) $ (7,857 ) Interest rate caps 26 16 (26 ) (16 ) Credit risk participation agreements 29 46 (91 ) (123 ) Foreign exchange contracts 51 21 (61 ) (40 ) Mortgage loan commitments 582 580 — — Mortgage loan forward sale contracts 1 8 — (7 ) Forward TBA contracts — 4 (75 ) (31 ) Total $ 5,092 $ 8,349 $ (16,373 ) $ (8,074 ) 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 Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended March 31 (In thousands) 2018 2017 Derivative instruments: Interest rate swaps Other non-interest income $ 505 $ 143 Credit risk participation agreements Other non-interest income 164 10 Foreign exchange contracts Other non-interest income 9 (20 ) Mortgage loan commitments Loan fees and sales 1 554 Mortgage loan forward sale contracts Loan fees and sales — 66 Forward TBA contracts Loan fees and sales 542 (98 ) Total $ 1,221 $ 655 The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. It also provides information about these instruments which are subject to an enforceable master netting arrangement, irrespective of whether they are offset, and the extent to which the instruments could potentially be offset. Also shown is collateral received or pledged in the form of other financial instruments, which is generally cash or marketable securities. The collateral amounts in this table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. Most of the derivatives in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default. Collateral exchanged between the Company and dealer bank counterparties is generally subject to thresholds and transfer minimums, and usually consists of marketable securities. By contract, these may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash or securities to its clearing agent. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below. Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Available for Offset Collateral Received/Pledged Net Amount March 31, 2018 Assets: Derivatives subject to master netting agreements $ 4,471 $ — $ 4,471 $ (451 ) $ (1,505 ) $ 2,515 Derivatives not subject to master netting agreements 621 — 621 Total derivatives 5,092 — 5,092 Liabilities: Derivatives subject to master netting agreements $ 16,237 $ — $ 16,237 $ (451 ) $ (1,188 ) $ 14,598 Derivatives not subject to master netting agreements 136 — 136 Total derivatives 16,373 — 16,373 December 31, 2017 Assets: Derivatives subject to master netting agreements $ 7,726 $ — $ 7,726 $ (233 ) $ (824 ) $ 6,669 Derivatives not subject to master netting agreements 623 — 623 Total derivatives 8,349 — 8,349 Liabilities: Derivatives subject to master netting agreements $ 7,935 $ — $ 7,935 $ (233 ) $ (1,570 ) $ 6,132 Derivatives not subject to master netting agreements 139 — 139 Total derivatives 8,074 — 8,074

Resale and Repurchase Agreement

Resale and Repurchase Agreements (Notes)	3 Months Ended
	Mar. 31, 2018
Resale and Repurchase Agreements [Abstract]
Resale and Repurchase Agreements [Text Block]	Resale and Repurchase Agreements The following table shows the extent to which assets and liabilities relating to securities purchased under agreements to resell (resale agreements) and securities sold under agreements to repurchase (repurchase agreements) have been offset in the consolidated balance sheets, in addition to the extent to which they could potentially be offset. Also shown is collateral received or pledged, which consists of marketable securities. The collateral amounts in the table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. The agreements in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default. Resale and repurchase agreements are agreements to purchase/sell securities subject to an obligation to resell/repurchase the same or similar securities. They are accounted for as collateralized financing transactions, not as sales and purchases of the securities portfolio. The securities collateral accepted or pledged in resale and repurchase agreements with other financial institutions also may be sold or re-pledged by the secured party, but is usually delivered to and held by third party trustees. The Company generally retains custody of securities pledged for repurchase agreements with customers. The Company is party to 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 consolidated balance sheets, as permitted under the netting provisions of ASC 210-20-45. The collateral swaps totaled $650.0 million at both March 31, 2018 and December 31, 2017 . At March 31, 2018 , the Company had posted collateral of $659.1 million in marketable securities, consisting of agency mortgage-backed bonds and treasuries, and had accepted $659.8 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 March 31, 2018 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,677,389 (650,000 ) 1,027,389 — (1,027,389 ) — December 31, 2017 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,954,768 (650,000 ) 1,304,768 — (1,304,768 ) — The table below shows the remaining contractual maturities of repurchase agreements outstanding at March 31, 2018 and December 31, 2017 , 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 March 31, 2018 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 217,927 $ 100,000 $ 350,000 $ 667,927 Government-sponsored enterprise obligations 91,930 — — 91,930 Agency mortgage-backed securities 486,517 16,500 200,000 703,017 Non-agency mortgage-backed securities 13,514 — — 13,514 Asset-backed securities 73,542 65,000 — 138,542 Other debt securities 62,459 — — 62,459 Total repurchase agreements, gross amount recognized $ 945,889 $ 181,500 $ 550,000 $ 1,677,389 December 31, 2017 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 271,820 $ 1,731 $ 450,000 $ 723,551 Government-sponsored enterprise obligations 149,111 — — 149,111 Agency mortgage-backed securities 737,975 9,750 200,000 947,725 Asset-backed securities 89,601 30,000 — 119,601 Other debt securities 14,780 — — 14,780 Total repurchase agreements, gross amount recognized $ 1,263,287 $ 41,481 $ 650,000 $ 1,954,768

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2018
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company issues stock-based compensation in the form of nonvested restricted stock and stock appreciation rights (SARs). Most of the awards are issued during the first quarter of each year. The stock-based compensation expense that has been charged against income was $3.3 million and $3.1 million in the three months ended March 31, 2018 and 2017 , respectively. Nonvested stock awards generally vest in 4 to 7 years and contain restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant. A summary of the status of the Company’s nonvested share awards as of March 31, 2018 , and changes during the three month period then ended, is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2018 1,254,518 $38.67 Granted 197,883 58.45 Vested (266,058 ) 32.56 Forfeited (2,604 ) 49.62 Nonvested at March 31, 2018 1,183,739 $43.33 SARs are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs vest ratably over 4 years of continuous service and have 10 -year contractual terms. All SARs must be settled in stock under provisions of the plan. In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs on date of grant. The current year per share average fair value and the model assumptions are shown in the table below. Weighted per share average fair value at grant date $12.44 Assumptions: Dividend yield 1.6 % Volatility 20.6 % Risk-free interest rate 2.7 % Expected term 6.6 years A summary of SAR activity during the first three months of 2018 is presented below. (Dollars in thousands, except per share data) Rights Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2018 1,179,286 $37.13 Granted 168,716 58.42 Forfeited (323 ) 37.52 Expired — — Exercised (195,980 ) 28.93 Outstanding at March 31, 2018 1,151,699 $41.65 7.4 years $ 21,035

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers The Company adopted ASU 2014-09, "Revenue from Contracts with Customers", and its related amendments on January 1, 2018. The core principle of the new guidance is that an entity should recognize revenue to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For the three months ended March 31, 2018 , approximately 62% of the Company’s total revenue was comprised of net interest income, which is not within the scope of this guidance. Of the remaining revenue, those items that were subject to this guidance mainly included fees for bank card, trust, deposit account services and consumer brokerage services. The Company has concluded that the new guidance did not require any significant change to its revenue recognition processes. However, application of the new guidance resulted in a reclassification of certain bank card related network and rewards costs, previously classified as non-interest expense, to a reduction to non-interest income in the Company’s consolidated statements of income. The reclassification had no effect on prior period net income or net income per share. The Company adopted ASU 2014-09 on a full retrospective basis, in which each prior reporting period has been presented in accordance with the new guidance. The table below shows the effect of this reclassification on bank card fee income and non-interest expense for the three months ended March 31, 2017 . Three Months Ended March 31, 2017 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 43,204 $ (7,453 ) $ 35,751 Total non-interest income 117,066 (7,453 ) 109,613 Non-interest expense: Data processing and software $ 23,097 $ (3,192 ) $ 19,905 Other 19,964 (4,261 ) 15,703 Total non-interest expense 186,830 (7,453 ) 179,377 The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. Three Months Ended March 31 (In thousands) 2018 2017 Bank card transaction fees $ 41,453 $ 35,751 Trust fees 36,062 32,014 Deposit account charges and other fees 22,982 21,942 Consumer brokerage services 3,768 3,649 Other non-interest income 7,311 7,597 Total non-interest revenue from contracts with customers 111,576 100,953 Other non-interest revenue (a) 8,114 8,660 Total non-interest income $ 119,690 $ 109,613 (a) This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions. The following table presents the opening and closing receivable balances of the three month periods ended March 31, 2018 and 2017 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) March 31, 2018 December 31, 2017 March 31, 2017 December 31, 2016 Bank card transaction fees $ 10,978 $ 13,315 $ 10,810 $ 14,686 Trust fees 3,116 2,802 2,627 2,681 Deposit account charges and other fees 4,682 5,597 4,467 5,735 Consumer brokerage services 690 380 353 309 For these revenue categories, none of the transaction price has been allocated to performance obligations that are unsatisfied as of the end of a reporting period. A description of these revenue categories follows. Bank Card Transaction Fees The following table presents the components of bank card fee income. Three Months Ended March 31 (In thousands) 2018 2017 Debit card: Fee income $ 9,762 $ 9,641 Expense for network charges (371 ) (1,650 ) Net debit card fees 9,391 7,991 Credit card: Fee income 6,045 5,740 Expense for network charges and rewards (2,944 ) (2,746 ) Net credit card fees 3,101 2,994 Corporate card: Fee income 47,876 42,419 Expense for network charges and rewards (23,708 ) (22,455 ) Net corporate card fees 24,168 19,964 Merchant: Fee income 7,301 7,939 Fees to cardholder banks (1,725 ) (2,089 ) Expense for network charges (783 ) (1,048 ) Net merchant fees 4,793 4,802 Total bank card transaction fees $ 41,453 $ 35,751 The majority of debit and credit card fees are reported in the Consumer segment, while corporate card and merchant fees are reported in the Commercial segment. Debit and Credit Card Fees The Company issues debit and credit cards to its retail and commercial banking customers who use the cards to purchase goods and services from merchants through an electronic payment system. As a card issuer, the Company earns fees, including interchange income, for processing the cardholder’s purchase transaction with a merchant through a settlement network. Purchases are charged directly to a customer’s checking account (in the case of a debit card), or are posted to a customer’s credit card account. The fees earned are established by the settlement network and are dependent on the type of transaction processed but are typically based on a per unit charge. Interchange income, the largest component of debit and credit card fees, is settled daily through the networks. The services provided to the cardholders include issuing and maintaining cards, settling purchases with merchants, and maintaining memberships in various card networks to facilitate processing. These services are considered one performance obligation as one of the services would not be performed without the others. The performance obligation is satisfied as services are rendered for each purchase transaction, and income is immediately recognized. In order to participate in the settlement network process, the Company must pay various transaction-related costs, established by the networks, including membership fees and a per unit charge for each transaction. These expenses are recorded net of the card fees earned. Consumer credit card products offer cardholders rewards that can be later redeemed for cash or goods or services to encourage card usage. Reward programs must meet network requirements based on the type of card issued. The expense associated with the rewards granted are recorded net of the credit card fees earned. Commercial card products offer cash rewards to corporate cardholders to encourage card usage in facilitating corporate payments. The Company pays cash rewards based on contractually agreed upon amounts, normally as a percent of each sales transaction. The expense associated with the cash rewards program is recorded net of the corporate card fees earned. Merchant Fees The Company offers merchant processing services to its business customers to enable them to accept credit and debit card payments. Merchant processing activities include gathering merchant sales information, authorizing sales transactions and collecting the funds from card issuers using the networks. The merchant is charged a merchant discount fee for the services based on agreed upon pricing between the merchant and the Company. Merchant fees are recorded net of outgoing interchange costs paid to the card issuing banks and net of other network costs as show in the table above. Merchant services provided are considered one performance obligation as one of the services would not be performed without the others. The performance obligation is satisfied as services are rendered for each settlement transaction and income is immediately recognized. Income earned from merchant fees settles with the customer according to terms negotiated in individual customer contracts. The majority of customers settle with the Company at least monthly. Trust Fees The following table shows the components of revenue within trust fees. Three Months Ended March 31 (In thousands) 2018 2017 Private client $ 26,868 $ 23,762 Institutional 7,411 6,494 Other 1,783 1,758 Total trust fees $ 36,062 $ 32,014 This revenue is reported in the Wealth segment. The Company provides trust and asset management services to both private client and institutional trust customers including asset custody, investment advice, and reporting and administrative services. Other specialized services such as tax preparation, financial planning, representation and other related services are provided as needed. Trust fees are generally earned monthly and billed based on a rate multiplied by the fair value of the customer trust assets. The majority of customer trust accounts are billed monthly. However, some accounts are billed quarterly, and a small number of accounts are billed semi-annually or annually, in accordance with agreements in place with the customer. The Company accrues trust fees monthly based on an estimate of fees due and either directly charges the customer’s account the following month or invoices the customer for fees due. The Company maintains written product pricing information which is used to bill each trust customer based on the services provided. Providing trust services is considered to be a single performance obligation that is satisfied on a monthly basis, involving the monthly custody of customer assets, statement rendering, periodic investment advice where applicable, and other specialized services as needed. As such, performance obligations are considered to be satisfied at the conclusion of each month while trust fee income is also recorded monthly. Deposit Account Charges and Other Fees The following table shows the components of revenue within deposit account charges and other fees. Three Months Ended March 31 (In thousands) 2018 2017 Corporate cash management fees $ 9,397 $ 8,911 Overdraft and return item fees 7,512 7,180 Other service charges on deposit accounts 6,073 5,851 Total deposit account charges and other fees $ 22,982 $ 21,942 Approximately half of this revenue is reported in the Consumer segment, while the remainder is reported in the Commercial segment. The Company provides corporate cash management services to its business and non-profit customers to meet their various transaction processing needs. Such services include deposit and check processing, lockbox, remote deposit, reconciliation, on-line banking and other similar transaction processing services. The Company maintains unit prices for each type of service, and the customer is billed based on transaction volumes processed monthly. The customer is usually billed either monthly or quarterly, however, some customers may be billed semi-annually or annually. The customer may pay for the cash management services provided either by paying in cash or using the value of deposit balances (formula provided to the customer) held at the Company. The Company’s performance obligation for corporate cash management services is the processing of items over a monthly term, and the obligations are satisfied at the conclusion of each month. Overdraft fees are charged to customers when daily checks and other withdrawals to customers’ accounts exceed balances on hand. Fees are based on a unit price multiplied by the number of items processed whose total amounts exceed the available account balance. The daily overdraft charge is calculated and the fee is posted to the customer’s account each day. The Company’s performance obligations for overdraft transactions is based on the daily transaction processed and the obligation is satisfied as each day’s transaction processing is concluded. Other deposit fees include numerous smaller fees such as monthly statement fees, foreign ATM processing fees, identification restoration fees, and stop payment fees. Such fees are mostly billed to customers directly on their monthly deposit account statements, or in the case of ATM fees, the fee is charged to the customer on the day that transactions are processed. Performance obligations for all of these various services are satisfied at the time that the service is rendered. Consumer Brokerage Services The following shows the components of revenue within consumer brokerage services. Three Months Ended March 31 (In thousands) 2018 2017 Commission income $ 2,092 $ 2,230 Managed account services 1,676 1,419 Total consumer brokerage services $ 3,768 $ 3,649 Nearly all of this revenue is reported in the Company's Wealth segment. Consumer brokerage services revenue is comprised of commissions received upon the execution of purchases and sales of mutual fund shares and equity securities, in addition to sales of annuities and certain limited insurance products in an agency capacity. Also, fees are earned on professionally managed advisory programs through arrangements with sub-advisors. Payment from the customer is due upon settlement date for purchases and sales of securities, at the purchase date for annuities and insurance products, and upon inception of the service period for advisory programs. Most of the contracts (except advisory contracts) encompass two types of performance obligations. The first is an obligation to provide account maintenance, record keeping and custodial services throughout the contract term. The second is the obligation to provide trade execution services for the customers' purchases and sales of products mentioned above. The first obligation is satisfied over time as the service period elapses, while the second type of obligation is satisfied upon the execution of each purchase/sale transaction. Contracts for advisory services contain a single performance obligation comprised of providing the management services and related reporting/administrative services over the contract term. The transaction price of the contracts (except advisory contracts) is a commission charged at the time of trade execution. The commission varies across different security types, insurance products and mutual funds. It is generally determined by standardized price lists published by the Company and its mutual fund and insurance vendors. Because the transaction price relates specifically to the trade execution, it has been allocated to that performance obligation and is recorded at the time of execution. The fee for advisory services is charged to the customer in advance of the quarterly service period, based on the account balance at the beginning of the period. Revenue is recognized ratably over the service period. Other Non-Interest Revenue from Contracts with Customers Other non-interest revenue consists mainly of various customer deposit related fees such as ATM fees and gains on sales of tax credits, foreclosed assets, and bank premises and equipment. Performance obligations for these services consist mainly of the execution of transactions for sales of various properties or providing specific deposit related transactions. Fees from these revenue sources are recognized when the performance obligation is completed, at which time cash is received by the Company.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Fair Value Measurements	Fair Value Measurements The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as available for sale debt securities, equity securities, trading debt securities, certain investments relating to private equity activities, and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as mortgage servicing rights and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or fair value accounting or write-downs of individual assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. For accounting disclosure purposes, a three-level valuation hierarchy of fair value measurements has been established. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1 – inputs to the valuation methodology are quoted prices for identical assets or liabilities in active markets. • Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds). • Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company’s best information and assumptions that a market participant would consider. The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in the Fair Value Measurements note in the Company's 2017 Annual Report on Form 10-K. There have been no significant changes in these methodologies since then. Instruments Measured at Fair Value on a Recurring Basis The table below presents the March 31, 2018 and December 31, 2017 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first three months of 2018 or the year ended December 31, 2017 . 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) March 31, 2018 Assets: Residential mortgage loans held for sale $ 6,480 $ — $ 6,480 $ — Available for sale debt securities: U.S. government and federal agency obligations 911,923 911,923 — — Government-sponsored enterprise obligations 388,599 — 388,599 — State and municipal obligations 1,416,845 — 1,399,687 17,158 Agency mortgage-backed securities 2,954,994 — 2,954,994 — Non-agency mortgage-backed securities 960,612 — 960,612 — Asset-backed securities 1,466,035 — 1,466,035 — Other debt securities 333,172 — 333,172 — Trading debt securities 32,025 — 32,025 — Equity securities 49,784 20,151 29,633 — Private equity investments 64,951 — — 64,951 Derivatives * 5,092 — 4,481 611 Assets held in trust for deferred compensation plan 13,582 13,582 — — Total assets 8,604,094 945,656 7,575,718 82,720 Liabilities: Derivatives * 16,373 — 16,282 91 Liabilities held in trust for deferred compensation plan 13,582 13,582 — — Total liabilities $ 29,955 $ 13,582 $ 16,282 $ 91 December 31, 2017 Assets: Residential mortgage loans held for sale $ 15,327 $ — $ 15,327 $ — Available for sale debt securities: U.S. government and federal agency obligations 917,147 917,147 — — Government-sponsored enterprise obligations 406,363 — 406,363 — State and municipal obligations 1,611,366 — 1,594,350 17,016 Agency mortgage-backed securities 3,040,913 — 3,040,913 — Non-agency mortgage-backed securities 905,793 — 905,793 — Asset-backed securities 1,492,800 — 1,492,800 — Other debt securities 351,060 — 351,060 — Trading debt securities 18,269 — 18,269 — Equity securities 48,838 19,864 28,974 — Private equity investments 55,752 — — 55,752 Derivatives * 8,349 — 7,723 626 Assets held in trust for deferred compensation plan 12,843 12,843 — — Total assets 8,884,820 949,854 7,861,572 73,394 Liabilities: Derivatives * 8,074 — 7,951 123 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — Total liabilities $ 20,917 $ 12,843 $ 7,951 $ 123 * The fair value of each class of derivative is shown in Note 10. The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (In thousands) State and Municipal Obligations Private Equity Investments Derivatives Total For the three months ended March 31, 2018 Balance January 1, 2018 $ 17,016 $ 55,752 $ 503 $ 73,271 Total gains or losses (realized/unrealized): Included in earnings — 4,305 165 4,470 Included in other comprehensive income * 133 — — 133 Discount accretion 9 — — 9 Purchases of private equity investments — 4,879 — 4,879 Sale/pay down of private equity investments — (20 ) — (20 ) Capitalized interest/dividends — 35 — 35 Sale of risk participation agreement — — (148 ) (148 ) Balance March 31, 2018 $ 17,158 $ 64,951 $ 520 $ 82,629 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2018 $ — $ 4,305 $ 745 $ 5,050 For the three months ended March 31, 2017 Balance January 1, 2017 $ 16,682 $ 50,820 $ 258 $ 67,760 Total gains or losses (realized/unrealized): Included in earnings — (2,878 ) 564 (2,314 ) Included in other comprehensive income * 391 — — 391 Discount accretion 10 — — 10 Purchases of private equity investments — 4,825 — 4,825 Capitalized interest/dividends — 33 — 33 Balance March 31, 2017 $ 17,083 $ 52,800 $ 822 $ 70,705 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2017 $ — $ (2,878 ) $ 913 $ (1,965 ) * Included in "net unrealized gains (losses) on other debt securities" in the consolidated statements of comprehensive income. Gains and losses included in earnings for the Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income: (In thousands) Loan Fees and Sales Other Non-Interest Income Investment Securities Gains (Losses), Net Total For the three months ended March 31, 2018 Total gains or losses included in earnings $ 2 $ 163 $ 4,305 $ 4,470 Change in unrealized gains or losses relating to assets still held at March 31, 2018 $ 582 $ 163 $ 4,305 $ 5,050 For the three months ended March 31, 2017 Total gains or losses included in earnings $ 554 $ 10 $ (2,878 ) $ (2,314 ) Change in unrealized gains or losses relating to assets still held at March 31, 2017 $ 903 $ 10 $ (2,878 ) $ (1,965 ) Level 3 Inputs 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 March 31, 2018 , while private equity investments, included in other securities, totaled $65.0 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 3.6% - 3.9% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 51.4% - 99.1% 78.5% Embedded servicing value .1% - 2.4% 1.3% Instruments Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis during the first three months of 2018 and 2017 , and still held as of March 31, 2018 and 2017 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at March 31, 2018 and 2017 . Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Gains (Losses) Recognized During the Three Months Ended March 31 March 31, 2018 Collateral dependent impaired loans $ 39 $ — $ — $ 39 $ (12 ) Mortgage servicing rights 5,105 — — 5,105 9 Long-lived assets 914 — — 914 (552 ) March 31, 2017 Collateral dependent impaired loans $ 1,349 $ — $ — $ 1,349 $ (340 ) Mortgage servicing rights 3,106 — — 3,106 7 Foreclosed assets 95 — — 95 (29 ) Long-lived assets 1,316 — — 1,316 (193 )

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	3 Months Ended
	Mar. 31, 2018
Fair Value Of Financial Instruments [Abstract]
Fair Value Of Financial Instruments	Fair Value of Financial Instruments The carrying amounts and estimated fair values of financial instruments held by the Company are set forth below. Fair value estimates are made at a specific point in time based on relevant market information. They do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for many of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, risk characteristics and economic conditions. These estimates are subjective, involve uncertainties, and cannot be determined with precision. Changes in assumptions could significantly affect the estimates. As mentioned in Note 3, the Company prospectively adopted ASU 2016-01 on January 1, 2018. In accordance with its requirements, the fair value of loans as of March 31, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion. The estimated fair values of the Company’s financial instruments and the classification of their fair value measurement within the valuation hierarchy are as follows at March 31, 2018 and December 31, 2017 : Carrying Amount Estimated Fair Value at March 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,960,614 $ — $ — $ 4,861,150 $ 4,861,150 Real estate - construction and land 932,058 — — 927,316 927,316 Real estate - business 2,724,584 — — 2,690,305 2,690,305 Real estate - personal 2,069,012 — — 2,009,625 2,009,625 Consumer 2,069,235 — — 2,032,968 2,032,968 Revolving home equity 382,825 — — 376,043 376,043 Consumer credit card 752,651 — — 701,833 701,833 Overdrafts 2,382 — — 1,777 1,777 Total loans 13,893,361 — — 13,601,017 13,601,017 Loans held for sale 16,435 — 16,435 — 16,435 Investment securities 8,624,037 932,074 7,564,757 127,206 8,624,037 Federal funds sold 17,000 17,000 — — 17,000 Securities purchased under agreements to resell 700,000 — — 685,539 685,539 Interest earning deposits with banks 134,697 134,697 — — 134,697 Cash and due from banks 423,048 423,048 — — 423,048 Derivative instruments 5,092 — 4,481 611 5,092 Assets held in trust for deferred compensation plan 13,582 13,582 — — 13,582 Total $ 23,827,252 $ 1,520,401 $ 7,585,673 $ 14,414,373 $ 23,520,447 Financial Liabilities Non-interest bearing deposits $ 6,953,430 $ 6,953,430 $ — $ — $ 6,953,430 Savings, interest checking and money market deposits 11,828,138 11,828,138 — — 11,828,138 Time open and certificates of deposit 1,756,903 — — 1,755,581 1,755,581 Federal funds purchased 104,940 104,940 — — 104,940 Securities sold under agreements to repurchase 1,027,389 — — 1,027,814 1,027,814 Other borrowings 9,214 — 7,530 1,684 9,214 Derivative instruments 16,373 — 16,282 91 16,373 Liabilities held in trust for deferred compensation plan 13,582 13,582 — — 13,582 Total $ 21,709,969 $ 18,900,090 $ 23,812 $ 2,785,170 $ 21,709,072 Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,958,554 $ — $ — $ 4,971,401 $ 4,971,401 Real estate - construction and land 968,820 — — 979,389 979,389 Real estate - business 2,697,452 — — 2,702,598 2,702,598 Real estate - personal 2,062,787 — — 2,060,443 2,060,443 Consumer 2,104,487 — — 2,074,129 2,074,129 Revolving home equity 400,587 — — 400,333 400,333 Consumer credit card 783,864 — — 798,093 798,093 Overdrafts 7,123 — — 7,123 7,123 Total loans 13,983,674 — — 13,993,509 13,993,509 Loans held for sale 21,398 — 21,398 — 21,398 Investment securities 8,893,307 937,011 7,838,522 117,774 8,893,307 Federal funds sold 42,775 42,775 — — 42,775 Securities purchased under agreements to resell 700,000 — — 695,194 695,194 Interest earning deposits with banks 30,631 30,631 — — 30,631 Cash and due from banks 438,439 438,439 — — 438,439 Derivative instruments 8,349 — 7,723 626 8,349 Assets held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 24,131,416 $ 1,461,699 $ 7,867,643 $ 14,807,103 $ 24,136,445 Financial Liabilities Non-interest bearing deposits $ 7,158,962 $ 7,158,962 $ — $ — $ 7,158,962 Savings, interest checking and money market deposits 11,499,620 11,499,620 — — 11,499,620 Time open and certificates of deposit 1,766,864 — — 1,768,780 1,768,780 Federal funds purchased 202,370 202,370 — — 202,370 Securities sold under agreements to repurchase 1,304,768 — — 1,305,375 1,305,375 Other borrowings 1,758 — — 1,758 1,758 Derivative instruments 8,074 — 7,951 123 8,074 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 21,955,259 $ 18,873,795 $ 7,951 $ 3,076,036 $ 21,957,782

Legal and Regulatory Proceeding

Legal and Regulatory Proceedings (Notes)	3 Months Ended
	Mar. 31, 2018
Legal Proceedings [Abstract]
Legal Matters and Contingencies [Text Block]	Legal and Regulatory Proceedings The Company has various legal proceedings pending at March 31, 2018 , arising in the normal course of business. While some matters pending against the Company specify damages claimed by plaintiffs, others do not seek a specified amount of damages or are at very early stages of the legal process. The Company records a loss accrual for all legal and regulatory matters for which it deems a loss is probable and can be reasonably estimated. Some matters, which are in the early stages, have not yet progressed to the point where a loss amount can be determined to be probable and estimable.

Loans And Allowance For Loan 26

Loans And Allowance For Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Loans And Allowance For Loan Losses [Abstract]
Summary Classification Of Held To Maturity Loan Portfolio	Major classifications within the Company’s held for investment loan portfolio at March 31, 2018 and December 31, 2017 are as follows: (In thousands) March 31, 2018 December 31, 2017 Commercial: Business $ 4,960,614 $ 4,958,554 Real estate – construction and land 932,058 968,820 Real estate – business 2,724,584 2,697,452 Personal Banking: Real estate – personal 2,069,012 2,062,787 Consumer 2,069,235 2,104,487 Revolving home equity 382,825 400,587 Consumer credit card 752,651 783,864 Overdrafts 2,382 7,123 Total loans $ 13,893,361 $ 13,983,674
Summary Of Activity In The Allowance For Loan Losses	A summary of the activity in the allowance for loan losses during the three months ended March 31, 2018 and 2017 , respectively, follows: For the Three Months Ended March 31 (In thousands) Commercial Personal Banking Total Balance at January 1 $ 93,704 $ 65,828 $ 159,532 Provision (894 ) 11,290 10,396 Deductions: Loans charged off 366 13,365 13,731 Less recoveries on loans 621 2,714 3,335 Net loan charge-offs (recoveries) (255 ) 10,651 10,396 Balance March 31, 2018 $ 93,065 $ 66,467 $ 159,532 Balance at January 1 $ 91,361 $ 64,571 $ 155,932 Provision 1,113 10,015 11,128 Deductions: Loans charged off 546 12,330 12,876 Less recoveries on loans 1,023 2,625 3,648 Net loan charge-offs (recoveries) (477 ) 9,705 9,228 Balance March 31, 2017 $ 92,951 $ 64,881 $ 157,832
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 March 31, 2018 and December 31, 2017 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under Accounting Standards Codification (ASC) 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans discussed below, which are deemed to have similar risk characteristics and 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 March 31, 2018 Commercial $ 2,391 $ 82,699 $ 90,674 $ 8,534,557 Personal Banking 1,107 20,828 65,360 5,255,277 Total $ 3,498 $ 103,527 $ 156,034 $ 13,789,834 December 31, 2017 Commercial $ 3,067 $ 92,613 $ 90,637 $ 8,532,213 Personal Banking 1,176 22,182 64,652 5,336,666 Total $ 4,243 $ 114,795 $ 155,289 $ 13,868,879
Investment In Impaired Loans	The table below shows the Company’s investment in impaired loans at March 31, 2018 and December 31, 2017 . These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings. 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 14. (In thousands) Mar. 31, 2018 Dec. 31, 2017 Non-accrual loans $ 10,277 $ 11,983 Restructured loans (accruing) 93,250 102,812 Total impaired loans $ 103,527 $ 114,795
Additional Information About Impaired Loans Held	The following table provides additional information about impaired loans held by the Company at March 31, 2018 and December 31, 2017 , segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided. (In thousands) Recorded Investment Unpaid Principal Balance Related Allowance March 31, 2018 With no related allowance recorded: Business $ 5,221 $ 9,000 $ — Real estate – business 1,299 1,303 — $ 6,520 $ 10,303 $ — With an allowance recorded: Business $ 64,228 $ 64,448 $ 1,905 Real estate – construction and land 1,458 1,462 42 Real estate – business 10,493 11,021 444 Real estate – personal 8,589 11,412 415 Consumer 5,415 5,415 52 Revolving home equity 153 153 17 Consumer credit card 6,671 6,671 623 $ 97,007 $ 100,582 $ 3,498 Total $ 103,527 $ 110,885 $ 3,498 December 31, 2017 With no related allowance recorded: Business $ 5,356 $ 9,000 $ — Real estate – business 1,299 1,303 — Consumer 779 817 — $ 7,434 $ 11,120 $ — With an allowance recorded: Business $ 72,589 $ 73,168 $ 2,455 Real estate – construction and land 837 841 27 Real estate – business 12,532 13,071 585 Real estate – personal 9,126 11,914 532 Consumer 5,388 5,426 67 Revolving home equity 204 204 11 Consumer credit card 6,685 6,685 566 $ 107,361 $ 111,309 $ 4,243 Total $ 114,795 $ 122,429 $ 4,243
Total Average Impaired Loans	Total average impaired loans for the three month periods ended March 31, 2018 and 2017 , respectively, are shown in the table below. (In thousands) Commercial Personal Banking Total Average Impaired Loans: For the three months ended March 31, 2018 Non-accrual loans $ 8,523 $ 2,928 $ 11,451 Restructured loans (accruing) 79,258 18,773 98,031 Total $ 87,781 $ 21,701 $ 109,482 For the three months ended March 31, 2017 Non-accrual loans $ 10,613 $ 3,509 $ 14,122 Restructured loans (accruing) 31,885 16,204 48,089 Total $ 42,498 $ 19,713 $ 62,211
Interest Income Recognized On Impaired Loans	The table below shows interest income recognized during the three month periods ended March 31, 2018 and 2017 , respectively, for impaired loans held at the end of each period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section on page 14. For the Three Months Ended March 31 (In thousands) 2018 2017 Interest income recognized on impaired loans: Business $ 760 $ 263 Real estate – construction and land 24 1 Real estate – business 113 62 Real estate – personal 111 37 Consumer 80 82 Revolving home equity 2 6 Consumer credit card 128 135 Total $ 1,218 $ 586
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 March 31, 2018 and December 31, 2017 . (In thousands) Current or Less Than 30 Days Past Due 30 – 89 Days Past Due 90 Days Past Due and Still Accruing Non-accrual Total March 31, 2018 Commercial: Business $ 4,928,806 $ 25,792 $ 459 $ 5,557 $ 4,960,614 Real estate – construction and land 929,113 2,940 — 5 932,058 Real estate – business 2,717,484 4,554 — 2,546 2,724,584 Personal Banking: Real estate – personal 2,059,965 5,962 916 2,169 2,069,012 Consumer 2,044,135 22,374 2,726 — 2,069,235 Revolving home equity 379,309 2,277 1,239 — 382,825 Consumer credit card 734,498 8,565 9,588 — 752,651 Overdrafts 2,123 259 — — 2,382 Total $ 13,795,433 $ 72,723 $ 14,928 $ 10,277 $ 13,893,361 December 31, 2017 Commercial: Business $ 4,949,148 $ 3,085 $ 374 $ 5,947 $ 4,958,554 Real estate – construction and land 967,321 1,473 21 5 968,820 Real estate – business 2,694,234 482 — 2,736 2,697,452 Personal Banking: Real estate – personal 2,050,787 6,218 3,321 2,461 2,062,787 Consumer 2,067,025 32,674 3,954 834 2,104,487 Revolving home equity 397,349 1,962 1,276 — 400,587 Consumer credit card 764,568 10,115 9,181 — 783,864 Overdrafts 6,840 283 — — 7,123 Total $ 13,897,272 $ 56,292 $ 18,127 $ 11,983 $ 13,983,674
Credit Quality Of Commercial Loan Portfolio	The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is applied to loans where the borrower exhibits negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Commercial Loans (In thousands) Business Real Estate-Construction Real Estate- Business Total March 31, 2018 Pass $ 4,716,879 $ 919,050 $ 2,632,074 $ 8,268,003 Special mention 88,442 10,694 50,925 150,061 Substandard 149,736 2,309 39,039 191,084 Non-accrual 5,557 5 2,546 8,108 Total $ 4,960,614 $ 932,058 $ 2,724,584 $ 8,617,256 December 31, 2017 Pass $ 4,740,013 $ 955,499 $ 2,593,005 $ 8,288,517 Special mention 59,177 10,614 50,577 120,368 Substandard 153,417 2,702 51,134 207,253 Non-accrual 5,947 5 2,736 8,688 Total $ 4,958,554 $ 968,820 $ 2,697,452 $ 8,624,826
Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding	For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at March 31, 2018 and December 31, 2017 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card March 31, 2018 FICO score: Under 600 1.3 % 3.5 % 1.1 % 5.2 % 600 - 659 1.7 5.3 1.7 15.1 660 - 719 10.0 17.3 9.1 36.1 720 - 779 26.0 26.9 23.2 25.6 780 and over 61.0 47.0 64.9 18.0 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2017 FICO score: Under 600 1.3 % 3.3 % 1.1 % 4.7 % 600 - 659 2.1 5.5 1.7 14.4 660 - 719 10.5 17.3 9.5 34.4 720 - 779 25.6 26.8 21.4 26.0 780 and over 60.5 47.1 66.3 20.5 Total 100.0 % 100.0 % 100.0 % 100.0 %
Outstanding Balance Of Loans Classified As Troubled Debt Restructurings	at March 31, 2018 , in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal. (In thousands) March 31, 2018 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 69,156 $ 43 Real estate - construction and land 1,399 — Real estate - business 10,546 1,299 Personal Banking: Real estate - personal 7,476 389 Consumer 5,469 106 Revolving home equity 152 74 Consumer credit card 6,671 744 Total troubled debt restructurings $ 100,869 $ 2,655
Additional Information about Troubled Debt Restructurings [Table Text Block]	(In thousands) March 31, 2018 December 31, 2017 Accruing loans: Non-market interest rates $ 77,922 $ 88,588 Assistance programs 6,671 6,685 Bankruptcy non-affirmation 8,386 7,283 Other 271 256 Non-accrual loans 7,619 7,796 Total troubled debt restructurings $ 100,869 $ 110,608

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investment Securities [Abstract]
Investment Securities, At Fair Value	March 31, 2018 December 31, 2017 Available for sale debt securities $ 8,432,180 $ 8,725,442 Trading debt securities 32,025 18,269 Equity securities: Readily determinable fair value 49,784 48,838 No readily determinable fair value 1,728 1,753 Other: Federal Reserve Bank stock 33,369 33,253 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 64,951 55,752 Total investment securities $ 8,624,037 $ 8,893,307
Summary Of Available For Sale Investment Securities By Maturity Groupings	A summary of the available for sale debt securities by maturity groupings as of March 31, 2018 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as the FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral. (In thousands) Amortized Cost Fair Value U.S. government and federal agency obligations: Within 1 year $ 52,205 $ 52,521 After 1 but within 5 years 644,016 636,542 After 5 but within 10 years 156,769 154,484 After 10 years 68,835 68,376 Total U.S. government and federal agency obligations 921,825 911,923 Government-sponsored enterprise obligations: Within 1 year 193,937 193,623 After 1 but within 5 years 121,580 120,181 After 5 but within 10 years 34,983 34,152 After 10 years 42,831 40,643 Total government-sponsored enterprise obligations 393,331 388,599 State and municipal obligations: Within 1 year 157,082 157,746 After 1 but within 5 years 567,474 569,318 After 5 but within 10 years 649,164 646,866 After 10 years 43,729 42,915 Total state and municipal obligations 1,417,449 1,416,845 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,003,975 2,954,994 Non-agency mortgage-backed securities 966,401 960,612 Asset-backed securities 1,476,947 1,466,035 Total mortgage and asset-backed securities 5,447,323 5,381,641 Other debt securities: Within 1 year 3,999 3,981 After 1 but within 5 years 262,778 258,315 After 5 but within 10 years 73,723 70,876 Total other debt securities 340,500 333,172 Total available for sale debt securities $ 8,520,428 $ 8,432,180
Available For Sale Securities Unrealized Gains And Losses By Security Type	For debt securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type. (In thousands) Amortized Cost Gross Gross Fair Value March 31, 2018 U.S. government and federal agency obligations $ 921,825 $ 1,617 $ (11,519 ) $ 911,923 Government-sponsored enterprise obligations 393,331 — (4,732 ) 388,599 State and municipal obligations 1,417,449 7,572 (8,176 ) 1,416,845 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,003,975 8,074 (57,055 ) 2,954,994 Non-agency mortgage-backed securities 966,401 6,530 (12,319 ) 960,612 Asset-backed securities 1,476,947 2,323 (13,235 ) 1,466,035 Total mortgage and asset-backed securities 5,447,323 16,927 (82,609 ) 5,381,641 Other debt securities 340,500 9 (7,337 ) 333,172 Total $ 8,520,428 $ 26,125 $ (114,373 ) $ 8,432,180 December 31, 2017 U.S. government and federal agency obligations $ 917,494 $ 4,096 $ (4,443 ) $ 917,147 Government-sponsored enterprise obligations 408,266 26 (1,929 ) 406,363 State and municipal obligations 1,592,707 21,413 (2,754 ) 1,611,366 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,046,701 17,956 (23,744 ) 3,040,913 Non-agency mortgage-backed securities 903,920 6,710 (4,837 ) 905,793 Asset-backed securities 1,495,380 2,657 (5,237 ) 1,492,800 Total mortgage and asset-backed securities 5,446,001 27,323 (33,818 ) 5,439,506 Other debt securities 350,988 1,250 (1,178 ) 351,060 Total $ 8,715,456 $ 54,108 $ (44,122 ) $ 8,725,442
Cash Flow Model Inputs Used To Calculate Credit Losses	ignificant inputs to the cash flow models used to calculate the credit losses on these securities at March 31, 2018 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 15% - 52% Credit support 0% - 63% Loss severity 15% - 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. For the Three Months Ended March 31 (In thousands) 2018 2017 Cumulative OTTI credit losses at January 1 $ 14,199 $ 14,080 Credit losses on debt securities for which impairment was not previously recognized 58 — Credit losses on debt securities for which impairment was previously recognized 10 109 Increase in expected cash flows that are recognized over remaining life of security (54 ) (73 ) Cumulative OTTI credit losses at March 31 $ 14,213 $ 14,116
Securities With Unrealized Losses And Length Of Impairment Period	ecurities 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 March 31, 2018 U.S. government and federal agency obligations $ 653,945 $ 9,647 $ 59,435 $ 1,872 $ 713,380 $ 11,519 Government-sponsored enterprise obligations 338,752 4,588 49,847 144 388,599 4,732 State and municipal obligations 529,699 6,427 44,474 1,749 574,173 8,176 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,922,859 35,455 591,341 21,600 2,514,200 57,055 Non-agency mortgage-backed securities 729,615 9,447 137,775 2,872 867,390 12,319 Asset-backed securities 884,800 11,101 207,087 2,134 1,091,887 13,235 Total mortgage and asset-backed securities 3,537,274 56,003 936,203 26,606 4,473,477 82,609 Other debt securities 305,412 6,462 19,779 875 325,191 7,337 Total $ 5,365,082 $ 83,127 $ 1,109,738 $ 31,246 $ 6,474,820 $ 114,373 December 31, 2017 U.S. government and federal agency obligations $ 618,617 $ 4,443 $ — $ — $ 618,617 $ 4,443 Government-sponsored enterprise obligations 286,393 1,712 49,766 217 336,159 1,929 State and municipal obligations 282,843 1,752 49,339 1,002 332,182 2,754 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,320,689 9,433 619,300 14,311 1,939,989 23,744 Non-agency mortgage-backed securities 577,017 2,966 153,813 1,871 730,830 4,837 Asset-backed securities 786,048 3,168 264,295 2,069 1,050,343 5,237 Total mortgage and asset-backed securities 2,683,754 15,567 1,037,408 18,251 3,721,162 33,818 Other debt securities 144,090 727 20,202 451 164,292 1,178 Total $ 4,015,697 $ 24,201 $ 1,156,715 $ 19,921 $ 5,172,412 $ 44,122
Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses	The following tables present proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Three Months Ended March 31 (In thousands) 2018 2017 Proceeds from sales of securities: Available for sale debt securities $ 148,637 $ — Equity securities 15 — Other — 98 Total proceeds $ 148,652 $ 98 Investment securities gains (losses), net: Available for sale debt securities: Gains realized on sales $ 212 $ — Gains realized on donations of securities — 2,157 Other-than-temporary impairment recognized on debt securities (68 ) (109 ) Equity securities: Gains realized on sales 14 — Fair value adjustments, net 947 — Other: Gains realized on sales — 58 Fair value adjustments, net 4,305 (2,878 ) Total investment securities gains (losses), net $ 5,410 $ (772 )

Goodwill And Other Intangible28

Goodwill And Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Intangible Assets With Estimable Useful Lives	The following table presents information about the Company's intangible assets which have estimable useful lives. March 31, 2018 December 31, 2017 (In thousands) Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Amortizable intangible assets: Core deposit premium $ 31,270 $ (28,482 ) $ — $ 2,788 $ 31,270 $ (28,305 ) $ — $ 2,965 Mortgage servicing rights 8,493 (3,388 ) — 5,105 7,906 (3,244 ) (9 ) 4,653 Total $ 39,763 $ (31,870 ) $ — $ 7,893 $ 39,176 $ (31,549 ) $ (9 ) $ 7,618
Schedule of Estimated Annual Amortization Expense	he following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of March 31, 2018 . The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. (In thousands) 2018 $ 1,202 2019 1,043 2020 893 2021 777 2022 684
Schedule Of Changes In CArrying Amount Of Goodwill And Net Other Intangible Assets	Changes in the carrying amount of goodwill and net other intangible assets for the three month period ended March 31, 2018 are as follows: (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance January 1, 2018 $ 138,921 $ 2,965 $ 4,653 Originations — — 587 Amortization — (177 ) (144 ) Impairment reversal — — 9 Balance March 31, 2018 $ 138,921 $ 2,788 $ 5,105
Schedule Of Goodwill Allocated By Operating Segments	Goodwill allocated to the Company’s operating segments at March 31, 2018 and December 31, 2017 is shown below. (In thousands) Consumer segment $ 70,721 Commercial segment 67,454 Wealth segment 746 Total goodwill $ 138,921

Pension (Tables)

Pension (Tables)	3 Months Ended
	Mar. 31, 2018
Pension [Abstract]
Net Pension Cost	The amount of net pension cost is shown in the table below: For the Three Months Ended March 31 (In thousands) 2018 2017 Service cost - benefits earned during the period $ 153 $ 129 Interest cost on projected benefit obligation 950 973 Expected return on plan assets (1,437 ) (1,438 ) Amortization of prior service cost (68 ) (68 ) Amortization of unrecognized net loss 592 617 Net periodic pension cost $ 190 $ 213

Common Stock (Tables)

Common Stock (Tables)	3 Months Ended
	Mar. 31, 2018
Common Stock [Abstract]
Summary Of Components Used To Calculate Basic And Diluted Income Per Share	Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 12. For the Three Months Ended March 31 (In thousands, except per share data) 2018 2017 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 100,984 $ 71,504 Less preferred stock dividends 2,250 2,250 Net income available to common shareholders 98,734 69,254 Less income allocated to nonvested restricted stock 1,121 945 Net income allocated to common stock $ 97,613 $ 68,309 Weighted average common shares outstanding 105,634 105,389 Basic income per common share $ .92 $ .65 Diluted income per common share: Net income available to common shareholders $ 98,734 $ 69,254 Less income allocated to nonvested restricted stock 1,118 942 Net income allocated to common stock $ 97,616 $ 68,312 Weighted average common shares outstanding 105,634 105,389 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 332 416 Weighted average diluted common shares outstanding 105,966 105,805 Diluted income per common share $ .92 $ .65

Accumulated Other Comprehensi31

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income	The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale debt securities. 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 the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. Unrealized Gains (Losses) on Securities (1) Pension Loss Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 2018 $ 3,411 $ 30,326 $ (19,629 ) $ 14,108 ASU 2018-02 Reclassification of tax rate change 715 6,359 (4,142 ) 2,932 ASU 2016-01 Reclassification of unrealized gain on equity securities — (33,320 ) — (33,320 ) Other comprehensive income (loss) before reclassifications to current earnings (8 ) (98,081 ) — (98,089 ) Amounts reclassified to current earnings from accumulated other comprehensive income 68 (212 ) 524 380 Current period other comprehensive income (loss), before tax 60 (98,293 ) 524 (97,709 ) Income tax (expense) benefit (15 ) 24,572 (131 ) 24,426 Current period other comprehensive income (loss), net of tax 45 (73,721 ) 393 (73,283 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 12 (12 ) — — Balance March 31, 2018 $ 4,183 $ (70,368 ) $ (23,378 ) $ (89,563 ) Balance January 1, 2017 $ 2,975 $ 27,328 $ (19,328 ) $ 10,975 Other comprehensive income before reclassifications to current earnings 44 32,805 — 32,849 Amounts reclassified to current earnings from accumulated other comprehensive income 109 (2,157 ) 549 (1,499 ) Current period other comprehensive income, before tax 153 30,648 549 31,350 Income tax expense (58 ) (11,646 ) (209 ) (11,913 ) Current period other comprehensive income, net of tax 95 19,002 340 19,437 Balance March 31, 2017 $ 3,070 $ 46,330 $ (18,988 ) $ 30,412

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule Of Financial Information By Segment	he following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below. (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Three Months Ended March 31, 2018 Net interest income $ 71,437 $ 82,095 $ 11,445 $ 164,977 $ 27,915 $ 192,892 Provision for loan losses (10,515 ) 180 (64 ) (10,399 ) 3 (10,396 ) Non-interest income 30,216 49,211 42,101 121,528 (1,838 ) 119,690 Investment securities gains, net — — — — 5,410 5,410 Non-interest expense (70,171 ) (72,798 ) (31,859 ) (174,828 ) (7,449 ) (182,277 ) Income before income taxes $ 20,967 $ 58,688 $ 21,623 $ 101,278 $ 24,041 $ 125,319 Three Months Ended March 31, 2017 Net interest income $ 67,354 $ 79,870 $ 11,844 $ 159,068 $ 19,205 $ 178,273 Provision for loan losses (9,662 ) 513 (23 ) (9,172 ) (1,956 ) (11,128 ) Non-interest income 27,163 44,910 37,706 109,779 (166 ) 109,613 Investment securities losses, net — — — — (772 ) (772 ) Non-interest expense (67,417 ) (70,365 ) (30,319 ) (168,101 ) (11,276 ) (179,377 ) Income before income taxes $ 17,438 $ 54,928 $ 19,208 $ 91,574 $ 5,035 $ 96,609

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instrument Detail [Abstract]
Schedule Of Notional Amounts Of Derivative Instruments	(In thousands) March 31, 2018 December 31, 2017 Interest rate swaps $ 1,787,029 $ 1,741,412 Interest rate caps 31,630 31,776 Credit risk participation agreements 153,219 133,488 Foreign exchange contracts 10,907 11,826 Mortgage loan commitments 16,297 17,110 Mortgage loan forward sale contracts 688 2,566 Forward TBA contracts 16,500 25,000 Total notional amount $ 2,016,270 $ 1,963,178
Schedule Of Fair Values Of Derivative Instruments	The fair values of the Company's derivative instruments, whose notional amounts are listed above, are shown in the table below. Information about the valuation methods used to determine fair value is provided in Note 15 on Fair Value Measurements in the 2017 Annual Report on Form 10-K. The Company's policy is to present its derivative assets and derivative liabilities on a gross basis in its consolidated balance sheets, and these are reported in other assets and other liabilities. However, in January 2017, a clearinghouse rule change required that variation margin on centrally cleared derivatives, formerly treated as collateral, be treated as settlements of derivative exposure. As a result, the fair values of the respective derivative contracts must be reduced by variation margin payments and reported as a single, net amount. Accordingly, at March 31, 2018 in the table below, the positive fair values of cleared swaps were reduced by $12.2 million and the negative fair values of cleared swaps were reduced by $484 thousand . At December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million . Asset Derivatives Liability Derivatives Mar. 31, 2018 Dec. 31, 2017 Mar. 31, 2018 Dec. 31, 2017 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 4,403 $ 7,674 $ (16,120 ) $ (7,857 ) Interest rate caps 26 16 (26 ) (16 ) Credit risk participation agreements 29 46 (91 ) (123 ) Foreign exchange contracts 51 21 (61 ) (40 ) Mortgage loan commitments 582 580 — — Mortgage loan forward sale contracts 1 8 — (7 ) Forward TBA contracts — 4 (75 ) (31 ) Total $ 5,092 $ 8,349 $ (16,373 ) $ (8,074 )
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 Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended March 31 (In thousands) 2018 2017 Derivative instruments: Interest rate swaps Other non-interest income $ 505 $ 143 Credit risk participation agreements Other non-interest income 164 10 Foreign exchange contracts Other non-interest income 9 (20 ) Mortgage loan commitments Loan fees and sales 1 554 Mortgage loan forward sale contracts Loan fees and sales — 66 Forward TBA contracts Loan fees and sales 542 (98 ) Total $ 1,221 $ 655
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 March 31, 2018 Assets: Derivatives subject to master netting agreements $ 4,471 $ — $ 4,471 $ (451 ) $ (1,505 ) $ 2,515 Derivatives not subject to master netting agreements 621 — 621 Total derivatives 5,092 — 5,092 Liabilities: Derivatives subject to master netting agreements $ 16,237 $ — $ 16,237 $ (451 ) $ (1,188 ) $ 14,598 Derivatives not subject to master netting agreements 136 — 136 Total derivatives 16,373 — 16,373 December 31, 2017 Assets: Derivatives subject to master netting agreements $ 7,726 $ — $ 7,726 $ (233 ) $ (824 ) $ 6,669 Derivatives not subject to master netting agreements 623 — 623 Total derivatives 8,349 — 8,349 Liabilities: Derivatives subject to master netting agreements $ 7,935 $ — $ 7,935 $ (233 ) $ (1,570 ) $ 6,132 Derivatives not subject to master netting agreements 139 — 139 Total derivatives 8,074 — 8,074

Resale and Repurchase Agreeme34

Resale and Repurchase Agreements (Tables)	3 Months Ended
	Mar. 31, 2018
Resale and Repurchase Agreements [Abstract]
Resale and Repurchase Agreements [Table Text Block]	Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Available for Offset Securities Collateral Received/Pledged Net Amount March 31, 2018 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,677,389 (650,000 ) 1,027,389 — (1,027,389 ) — December 31, 2017 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,954,768 (650,000 ) 1,304,768 — (1,304,768 ) —
Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]	Remaining Contractual Maturity of the Agreements (In thousands) Overnight and continuous Up to 90 days Greater than 90 days Total March 31, 2018 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 217,927 $ 100,000 $ 350,000 $ 667,927 Government-sponsored enterprise obligations 91,930 — — 91,930 Agency mortgage-backed securities 486,517 16,500 200,000 703,017 Non-agency mortgage-backed securities 13,514 — — 13,514 Asset-backed securities 73,542 65,000 — 138,542 Other debt securities 62,459 — — 62,459 Total repurchase agreements, gross amount recognized $ 945,889 $ 181,500 $ 550,000 $ 1,677,389 December 31, 2017 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 271,820 $ 1,731 $ 450,000 $ 723,551 Government-sponsored enterprise obligations 149,111 — — 149,111 Agency mortgage-backed securities 737,975 9,750 200,000 947,725 Asset-backed securities 89,601 30,000 — 119,601 Other debt securities 14,780 — — 14,780 Total repurchase agreements, gross amount recognized $ 1,263,287 $ 41,481 $ 650,000 $ 1,954,768

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
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 March 31, 2018 , and changes during the three month period then ended, is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2018 1,254,518 $38.67 Granted 197,883 58.45 Vested (266,058 ) 32.56 Forfeited (2,604 ) 49.62 Nonvested at March 31, 2018 1,183,739 $43.33
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The current year per share average fair value and the model assumptions are shown in the table below. Weighted per share average fair value at grant date $12.44 Assumptions: Dividend yield 1.6 % Volatility 20.6 % Risk-free interest rate 2.7 % Expected term 6.6 years
Summary Of SAR Activity	A summary of SAR activity during the first three months of 2018 is presented below. (Dollars in thousands, except per share data) Rights Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2018 1,179,286 $37.13 Granted 168,716 58.42 Forfeited (323 ) 37.52 Expired — — Exercised (195,980 ) 28.93 Outstanding at March 31, 2018 1,151,699 $41.65 7.4 years $ 21,035

Revenue from Contracts with C36

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Reclassification of Bank Card Transaction Fees [Table Text Block]	The Company has concluded that the new guidance did not require any significant change to its revenue recognition processes. However, application of the new guidance resulted in a reclassification of certain bank card related network and rewards costs, previously classified as non-interest expense, to a reduction to non-interest income in the Company’s consolidated statements of income. The reclassification had no effect on prior period net income or net income per share. The Company adopted ASU 2014-09 on a full retrospective basis, in which each prior reporting period has been presented in accordance with the new guidance. The table below shows the effect of this reclassification on bank card fee income and non-interest expense for the three months ended March 31, 2017 . Three Months Ended March 31, 2017 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 43,204 $ (7,453 ) $ 35,751 Total non-interest income 117,066 (7,453 ) 109,613 Non-interest expense: Data processing and software $ 23,097 $ (3,192 ) $ 19,905 Other 19,964 (4,261 ) 15,703 Total non-interest expense 186,830 (7,453 ) 179,377
Disaggregation of Revenue [Table Text Block]	The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. Three Months Ended March 31 (In thousands) 2018 2017 Bank card transaction fees $ 41,453 $ 35,751 Trust fees 36,062 32,014 Deposit account charges and other fees 22,982 21,942 Consumer brokerage services 3,768 3,649 Other non-interest income 7,311 7,597 Total non-interest revenue from contracts with customers 111,576 100,953 Other non-interest revenue (a) 8,114 8,660 Total non-interest income $ 119,690 $ 109,613 (a) This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions.
Contract with Customer, Asset and Liability [Table Text Block]	The following table presents the opening and closing receivable balances of the three month periods ended March 31, 2018 and 2017 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) March 31, 2018 December 31, 2017 March 31, 2017 December 31, 2016 Bank card transaction fees $ 10,978 $ 13,315 $ 10,810 $ 14,686 Trust fees 3,116 2,802 2,627 2,681 Deposit account charges and other fees 4,682 5,597 4,467 5,735 Consumer brokerage services 690 380 353 309
Bank Card Transaction Fees [Table Text Block]	The following table presents the components of bank card fee income. Three Months Ended March 31 (In thousands) 2018 2017 Debit card: Fee income $ 9,762 $ 9,641 Expense for network charges (371 ) (1,650 ) Net debit card fees 9,391 7,991 Credit card: Fee income 6,045 5,740 Expense for network charges and rewards (2,944 ) (2,746 ) Net credit card fees 3,101 2,994 Corporate card: Fee income 47,876 42,419 Expense for network charges and rewards (23,708 ) (22,455 ) Net corporate card fees 24,168 19,964 Merchant: Fee income 7,301 7,939 Fees to cardholder banks (1,725 ) (2,089 ) Expense for network charges (783 ) (1,048 ) Net merchant fees 4,793 4,802 Total bank card transaction fees $ 41,453 $ 35,751 The majority of debit and credit card fees are reported in the Consumer segment, while corporate card and merchant fees are reported in the Commercial segment.
Trust Fees [Table Text Block]	The following table shows the components of revenue within trust fees. Three Months Ended March 31 (In thousands) 2018 2017 Private client $ 26,868 $ 23,762 Institutional 7,411 6,494 Other 1,783 1,758 Total trust fees $ 36,062 $ 32,014 This revenue is reported in the Wealth segment.
Deposit Account Charges and Other Fees [Table Text Block]	The following table shows the components of revenue within deposit account charges and other fees. Three Months Ended March 31 (In thousands) 2018 2017 Corporate cash management fees $ 9,397 $ 8,911 Overdraft and return item fees 7,512 7,180 Other service charges on deposit accounts 6,073 5,851 Total deposit account charges and other fees $ 22,982 $ 21,942 Approximately half of this revenue is reported in the Consumer segment, while the remainder is reported in the Commercial segment.
Consumer Brokerage Services Revenue [Table Text Block]	The following shows the components of revenue within consumer brokerage services. Three Months Ended March 31 (In thousands) 2018 2017 Commission income $ 2,092 $ 2,230 Managed account services 1,676 1,419 Total consumer brokerage services $ 3,768 $ 3,649 Nearly all of this revenue is reported in the Company's Wealth segment.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The table below presents the March 31, 2018 and December 31, 2017 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first three months of 2018 or the year ended December 31, 2017 . 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) March 31, 2018 Assets: Residential mortgage loans held for sale $ 6,480 $ — $ 6,480 $ — Available for sale debt securities: U.S. government and federal agency obligations 911,923 911,923 — — Government-sponsored enterprise obligations 388,599 — 388,599 — State and municipal obligations 1,416,845 — 1,399,687 17,158 Agency mortgage-backed securities 2,954,994 — 2,954,994 — Non-agency mortgage-backed securities 960,612 — 960,612 — Asset-backed securities 1,466,035 — 1,466,035 — Other debt securities 333,172 — 333,172 — Trading debt securities 32,025 — 32,025 — Equity securities 49,784 20,151 29,633 — Private equity investments 64,951 — — 64,951 Derivatives * 5,092 — 4,481 611 Assets held in trust for deferred compensation plan 13,582 13,582 — — Total assets 8,604,094 945,656 7,575,718 82,720 Liabilities: Derivatives * 16,373 — 16,282 91 Liabilities held in trust for deferred compensation plan 13,582 13,582 — — Total liabilities $ 29,955 $ 13,582 $ 16,282 $ 91 December 31, 2017 Assets: Residential mortgage loans held for sale $ 15,327 $ — $ 15,327 $ — Available for sale debt securities: U.S. government and federal agency obligations 917,147 917,147 — — Government-sponsored enterprise obligations 406,363 — 406,363 — State and municipal obligations 1,611,366 — 1,594,350 17,016 Agency mortgage-backed securities 3,040,913 — 3,040,913 — Non-agency mortgage-backed securities 905,793 — 905,793 — Asset-backed securities 1,492,800 — 1,492,800 — Other debt securities 351,060 — 351,060 — Trading debt securities 18,269 — 18,269 — Equity securities 48,838 19,864 28,974 — Private equity investments 55,752 — — 55,752 Derivatives * 8,349 — 7,723 626 Assets held in trust for deferred compensation plan 12,843 12,843 — — Total assets 8,884,820 949,854 7,861,572 73,394 Liabilities: Derivatives * 8,074 — 7,951 123 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — Total liabilities $ 20,917 $ 12,843 $ 7,951 $ 123
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (In thousands) State and Municipal Obligations Private Equity Investments Derivatives Total For the three months ended March 31, 2018 Balance January 1, 2018 $ 17,016 $ 55,752 $ 503 $ 73,271 Total gains or losses (realized/unrealized): Included in earnings — 4,305 165 4,470 Included in other comprehensive income * 133 — — 133 Discount accretion 9 — — 9 Purchases of private equity investments — 4,879 — 4,879 Sale/pay down of private equity investments — (20 ) — (20 ) Capitalized interest/dividends — 35 — 35 Sale of risk participation agreement — — (148 ) (148 ) Balance March 31, 2018 $ 17,158 $ 64,951 $ 520 $ 82,629 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2018 $ — $ 4,305 $ 745 $ 5,050 For the three months ended March 31, 2017 Balance January 1, 2017 $ 16,682 $ 50,820 $ 258 $ 67,760 Total gains or losses (realized/unrealized): Included in earnings — (2,878 ) 564 (2,314 ) Included in other comprehensive income * 391 — — 391 Discount accretion 10 — — 10 Purchases of private equity investments — 4,825 — 4,825 Capitalized interest/dividends — 33 — 33 Balance March 31, 2017 $ 17,083 $ 52,800 $ 822 $ 70,705 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2017 $ — $ (2,878 ) $ 913 $ (1,965 )
Summary Of Gains And Losses On Level 3 Assets And Liabilities	Gains and losses included in earnings for the Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income: (In thousands) Loan Fees and Sales Other Non-Interest Income Investment Securities Gains (Losses), Net Total For the three months ended March 31, 2018 Total gains or losses included in earnings $ 2 $ 163 $ 4,305 $ 4,470 Change in unrealized gains or losses relating to assets still held at March 31, 2018 $ 582 $ 163 $ 4,305 $ 5,050 For the three months ended March 31, 2017 Total gains or losses included in earnings $ 554 $ 10 $ (2,878 ) $ (2,314 ) Change in unrealized gains or losses relating to assets still held at March 31, 2017 $ 903 $ 10 $ (2,878 ) $ (1,965 )
Summary Of Quantitative Information About Level 3 Fair Value Measurements	s 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 March 31, 2018 , while private equity investments, included in other securities, totaled $65.0 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 3.6% - 3.9% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 51.4% - 99.1% 78.5% Embedded servicing value .1% - 2.4% 1.3%
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]	s For assets measured at fair value on a nonrecurring basis during the first three months of 2018 and 2017 , and still held as of March 31, 2018 and 2017 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at March 31, 2018 and 2017 . Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Gains (Losses) Recognized During the Three Months Ended March 31 March 31, 2018 Collateral dependent impaired loans $ 39 $ — $ — $ 39 $ (12 ) Mortgage servicing rights 5,105 — — 5,105 9 Long-lived assets 914 — — 914 (552 ) March 31, 2017 Collateral dependent impaired loans $ 1,349 $ — $ — $ 1,349 $ (340 ) Mortgage servicing rights 3,106 — — 3,106 7 Foreclosed assets 95 — — 95 (29 ) Long-lived assets 1,316 — — 1,316 (193 )

Fair Value Of Financial Instr38

Fair Value Of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Of Financial Instruments [Abstract]
Fair value of financial instruments [Table Text Block]	Carrying Amount Estimated Fair Value at March 31, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,960,614 $ — $ — $ 4,861,150 $ 4,861,150 Real estate - construction and land 932,058 — — 927,316 927,316 Real estate - business 2,724,584 — — 2,690,305 2,690,305 Real estate - personal 2,069,012 — — 2,009,625 2,009,625 Consumer 2,069,235 — — 2,032,968 2,032,968 Revolving home equity 382,825 — — 376,043 376,043 Consumer credit card 752,651 — — 701,833 701,833 Overdrafts 2,382 — — 1,777 1,777 Total loans 13,893,361 — — 13,601,017 13,601,017 Loans held for sale 16,435 — 16,435 — 16,435 Investment securities 8,624,037 932,074 7,564,757 127,206 8,624,037 Federal funds sold 17,000 17,000 — — 17,000 Securities purchased under agreements to resell 700,000 — — 685,539 685,539 Interest earning deposits with banks 134,697 134,697 — — 134,697 Cash and due from banks 423,048 423,048 — — 423,048 Derivative instruments 5,092 — 4,481 611 5,092 Assets held in trust for deferred compensation plan 13,582 13,582 — — 13,582 Total $ 23,827,252 $ 1,520,401 $ 7,585,673 $ 14,414,373 $ 23,520,447 Financial Liabilities Non-interest bearing deposits $ 6,953,430 $ 6,953,430 $ — $ — $ 6,953,430 Savings, interest checking and money market deposits 11,828,138 11,828,138 — — 11,828,138 Time open and certificates of deposit 1,756,903 — — 1,755,581 1,755,581 Federal funds purchased 104,940 104,940 — — 104,940 Securities sold under agreements to repurchase 1,027,389 — — 1,027,814 1,027,814 Other borrowings 9,214 — 7,530 1,684 9,214 Derivative instruments 16,373 — 16,282 91 16,373 Liabilities held in trust for deferred compensation plan 13,582 13,582 — — 13,582 Total $ 21,709,969 $ 18,900,090 $ 23,812 $ 2,785,170 $ 21,709,072 Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,958,554 $ — $ — $ 4,971,401 $ 4,971,401 Real estate - construction and land 968,820 — — 979,389 979,389 Real estate - business 2,697,452 — — 2,702,598 2,702,598 Real estate - personal 2,062,787 — — 2,060,443 2,060,443 Consumer 2,104,487 — — 2,074,129 2,074,129 Revolving home equity 400,587 — — 400,333 400,333 Consumer credit card 783,864 — — 798,093 798,093 Overdrafts 7,123 — — 7,123 7,123 Total loans 13,983,674 — — 13,993,509 13,993,509 Loans held for sale 21,398 — 21,398 — 21,398 Investment securities 8,893,307 937,011 7,838,522 117,774 8,893,307 Federal funds sold 42,775 42,775 — — 42,775 Securities purchased under agreements to resell 700,000 — — 695,194 695,194 Interest earning deposits with banks 30,631 30,631 — — 30,631 Cash and due from banks 438,439 438,439 — — 438,439 Derivative instruments 8,349 — 7,723 626 8,349 Assets held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 24,131,416 $ 1,461,699 $ 7,867,643 $ 14,807,103 $ 24,136,445 Financial Liabilities Non-interest bearing deposits $ 7,158,962 $ 7,158,962 $ — $ — $ 7,158,962 Savings, interest checking and money market deposits 11,499,620 11,499,620 — — 11,499,620 Time open and certificates of deposit 1,766,864 — — 1,768,780 1,768,780 Federal funds purchased 202,370 202,370 — — 202,370 Securities sold under agreements to repurchase 1,304,768 — — 1,305,375 1,305,375 Other borrowings 1,758 — — 1,758 1,758 Derivative instruments 8,074 — 7,951 123 8,074 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 21,955,259 $ 18,873,795 $ 7,951 $ 3,076,036 $ 21,957,782

Loans And Allowance For Loan 39

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Abstract]
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	$ 3,700,000,000
Loans Pledged to the Federal Reserve Bank as collateral for discount window borrowings	$ 1,700,000,000
Period after which loans are deemed in default (in days)	90 days
Effect on Interest Income Resulting From Modification to Credit Card Loans	$ (896,000)
Commitments to lend additional funds to customers with restructured loans	10,600,000
Fair Value of Personal Real Estate Loans Held for Sale	6,500,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	6,300,000
Student Loans Held for Sale, Lower of Cost or Fair Value	10,000,000
HFS Loans on non accrual status	0
HFS loans past due and still accruing	0
Foreclosed real estate	1,300,000	$ 681,000
Personal property acquired in repossession	$ 3,100,000	$ 2,700,000

Loans And Allowance For Loan 40

Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 13,893,361	$ 13,983,674
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	4,960,614	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	932,058	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,724,584	2,697,452
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,069,012	2,062,787
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,069,235	2,104,487
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	382,825	400,587
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	752,651	783,864
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 2,382	$ 7,123

Loans And Allowance For Loan 41

Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 159,532	$ 155,932
Provision	10,396	11,128
Loans charged off	13,731	12,876
Less recoveries on loans	3,335	3,648
Net loan charge-offs (recoveries)	10,396	9,228
Balance at end of period	159,532	157,832
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	93,704	91,361
Provision	(894)	1,113
Loans charged off	366	546
Less recoveries on loans	621	1,023
Net loan charge-offs (recoveries)	(255)	(477)
Balance at end of period	93,065	92,951
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	65,828	64,571
Provision	11,290	10,015
Loans charged off	13,365	12,330
Less recoveries on loans	2,714	2,625
Net loan charge-offs (recoveries)	10,651	9,705
Balance at end of period	$ 66,467	$ 64,881

Loans And Allowance For Loan 42

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	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	$ 13,789,834	$ 13,868,879
Impaired Financing Receivable, Recorded Investment	103,527	114,795
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	156,034	155,289
Impaired Financing Receivable, Related Allowance	3,498	4,243
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	8,534,557	8,532,213
Impaired Financing Receivable, Recorded Investment	82,699	92,613
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	90,674	90,637
Impaired Financing Receivable, Related Allowance	2,391	3,067
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	5,255,277	5,336,666
Impaired Financing Receivable, Recorded Investment	20,828	22,182
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	65,360	64,652
Impaired Financing Receivable, Related Allowance	$ 1,107	$ 1,176

Loans And Allowance For Loan 43

Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 10,277	$ 11,983
Restructured loans (accruing)	93,250	102,812
Total impaired loans	$ 103,527	$ 114,795

Loans And Allowance For Loan 44

Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 6,520,000	$ 7,434,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,303,000	11,120,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	97,007,000	107,361,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	100,582,000	111,309,000
Impaired Financing Receivable, Related Allowance	3,498,000	4,243,000
Impaired Financing Receivable, Recorded Investment	103,527,000	114,795,000
Impaired Financing Receivable, Unpaid Principal Balance	110,885,000	122,429,000
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,221,000	5,356,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	9,000,000	9,000,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	64,228,000	72,589,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	64,448,000	73,168,000
Impaired Financing Receivable, Related Allowance	1,905,000	2,455,000
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,458,000	837,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,462,000	841,000
Impaired Financing Receivable, Related Allowance	42,000	27,000
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,299,000	1,299,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,303,000	1,303,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	10,493,000	12,532,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,021,000	13,071,000
Impaired Financing Receivable, Related Allowance	444,000	585,000
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,589,000	9,126,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,412,000	11,914,000
Impaired Financing Receivable, Related Allowance	415,000	532,000
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	779,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	817,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,415,000	5,388,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,415,000	5,426,000
Impaired Financing Receivable, Related Allowance	52,000	67,000
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	153,000	204,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	153,000	204,000
Impaired Financing Receivable, Related Allowance	17,000	11,000
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,671,000	6,685,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,671,000	6,685,000
Impaired Financing Receivable, Related Allowance	$ 623,000	$ 566,000

Loans And Allowance For Loan 45

Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 11,451	$ 14,122
Restructured loans (accruing)	98,031	48,089
Total	109,482	62,211
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	8,523	10,613
Restructured loans (accruing)	79,258	31,885
Total	87,781	42,498
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	2,928	3,509
Restructured loans (accruing)	18,773	16,204
Total	$ 21,701	$ 19,713

Loans And Allowance For Loan 46

Loans And Allowance For Loan Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 1,218	$ 586
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	760	263
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	24	1
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	113	62
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	111	37
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	80	82
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	2	6
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 128	$ 135

Loans And Allowance For Loan 47

Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	$ 13,795,433	$ 13,897,272
30 - 89 Days Past Due	72,723	56,292
90 Days Past Due and Still Accruing	14,928	18,127
Non-accrual loans	10,277	11,983
Total	13,893,361	13,983,674
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	4,960,614	4,958,554
Business [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	4,928,806	4,949,148
30 - 89 Days Past Due	25,792	3,085
90 Days Past Due and Still Accruing	459	374
Non-accrual loans	5,557	5,947
Total	4,960,614	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	932,058	968,820
Real Estate - Construction And Land [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	929,113	967,321
30 - 89 Days Past Due	2,940	1,473
90 Days Past Due and Still Accruing	0	21
Non-accrual loans	5	5
Total	932,058	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,724,584	2,697,452
Real Estate - Business [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,717,484	2,694,234
30 - 89 Days Past Due	4,554	482
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	2,546	2,736
Total	2,724,584	2,697,452
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,069,012	2,062,787
Real Estate - Personal [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,059,965	2,050,787
30 - 89 Days Past Due	5,962	6,218
90 Days Past Due and Still Accruing	916	3,321
Non-accrual loans	2,169	2,461
Total	2,069,012	2,062,787
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,069,235	2,104,487
Consumer [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,044,135	2,067,025
30 - 89 Days Past Due	22,374	32,674
90 Days Past Due and Still Accruing	2,726	3,954
Non-accrual loans	0	834
Total	2,069,235	2,104,487
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	382,825	400,587
Revolving Home Equity [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	379,309	397,349
30 - 89 Days Past Due	2,277	1,962
90 Days Past Due and Still Accruing	1,239	1,276
Non-accrual loans	0	0
Total	382,825	400,587
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	752,651	783,864
Consumer Credit Card [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	734,498	764,568
30 - 89 Days Past Due	8,565	10,115
90 Days Past Due and Still Accruing	9,588	9,181
Non-accrual loans	0	0
Total	752,651	783,864
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,382	7,123
Overdrafts [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,123	6,840
30 - 89 Days Past Due	259	283
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	0	0
Total	$ 2,382	$ 7,123

Loans And Allowance For Loan 48

Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) - Commercial Portfolio Segment [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 8,617,256	$ 8,624,826
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,268,003	8,288,517
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	150,061	120,368
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	191,084	207,253
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,108	8,688
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,960,614	4,958,554
Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,716,879	4,740,013
Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	88,442	59,177
Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	149,736	153,417
Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,557	5,947
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	932,058	968,820
Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	919,050	955,499
Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	10,694	10,614
Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,309	2,702
Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5	5
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,724,584	2,697,452
Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,632,074	2,593,005
Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	50,925	50,577
Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	39,039	51,134
Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 2,546	$ 2,736

Loans And Allowance For Loan 49

Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 216.2	$ 219.2
Consumer Healthcare Loans Excluded	$ 148.9	$ 145
Credit quality personal banking loan table percentage loans excluded	7.00%
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real Estate - Personal [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.30%	1.30%
Real Estate - Personal [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.70%	2.10%
Real Estate - Personal [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.00%	10.50%
Real Estate - Personal [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.00%	25.60%
Real Estate - Personal [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	61.00%	60.50%
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.50%	3.30%
Consumer [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.30%	5.50%
Consumer [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	17.30%	17.30%
Consumer [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.90%	26.80%
Consumer [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	47.00%	47.10%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.10%	1.10%
Revolving Home Equity [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.70%	1.70%
Revolving Home Equity [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.10%	9.50%
Revolving Home Equity [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.20%	21.40%
Revolving Home Equity [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	64.90%	66.30%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.20%	4.70%
Consumer Credit Card [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	15.10%	14.40%
Consumer Credit Card [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	36.10%	34.40%
Consumer Credit Card [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.60%	26.00%
Consumer Credit Card [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	18.00%	20.50%

Loans And Allowance For Loan 50

Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 100,869	$ 110,608
Balance 90 days past due at any time during previous 12 months	2,655
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	69,156
Balance 90 days past due at any time during previous 12 months	43
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,399
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,546
Balance 90 days past due at any time during previous 12 months	1,299
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,476
Balance 90 days past due at any time during previous 12 months	389
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,469
Balance 90 days past due at any time during previous 12 months	106
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	152
Balance 90 days past due at any time during previous 12 months	74
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,671
Balance 90 days past due at any time during previous 12 months	$ 744

Loans And Allowance For Loan 51

Loans And Allowance For Loan Losses Troubled Debt Restructurings by Type of Modification (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 100,869	$ 110,608
TDR Non-market interest rates [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	77,922	88,588
TDR Assistance programs [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,671	6,685
TDR-Bankruptcy non-affirmation [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,386	7,283
TDR Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	271	256
TDR Non-accrual loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 7,619	$ 7,796

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Investment [Line Items]
Equity Securities, FV-NI, Cost	$ 4,400
Equity securities, FV-NI	49,784	$ 48,838
Equity securities, FV-NI, Unrealized Gain	947
Equtiy Securities without Readily Determinable Fair Values	1,728	1,753
U.S. Treasury inflation-protected securities held, at fair value	$ 442,400
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 62,800	68,000
Credit-related portion of impairments included in earnings, for securities on watch list	14,213	14,199	$ 14,116	$ 14,080
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,474,820	5,172,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	114,373	44,122
AFS securities in loss position at period-end, change in unrealized loss	70,300
Securities pledged as collateral	3,700,000
Securities pledged as collateral and may be sold or re-pledged	$ 659,400
Number of investments in a single issuer that exceed 10% of stockholder's equity	0
No investment in a single issuer exceeds this percentage of stockholder's equity	10.00%
State And Municipal Obligations [Member]
Investment [Line Items]
Auction rate securities held at fair value	$ 17,200
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	574,173	332,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8,176	2,754
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Fair value of securities on other-than-temporary impairment watch list	24,800
Credit-related portion of impairments included in earnings, for securities on watch list	14,200
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	867,390	730,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,319	$ 4,837
Accounting Standards Update 2016-01 [Member]
Investment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 33,320

Investment Securities (Investme

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment Securities [Abstract]
Available-for-sale Securities, Debt Securities	$ 8,432,180	$ 8,725,442
Trading securities	32,025	18,269
Equity securities, FV-NI	49,784	48,838
Equtiy Securities without Readily Determinable Fair Values	1,728	1,753
Federal Reserve Bank Stock	33,369	33,253
Federal Home Loan Bank Stock	10,000	10,000
Private equity investments	64,951	55,752
Total investment securities	$ 8,624,037	$ 8,893,307

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Amortized Cost	$ 8,520,428	$ 8,715,456
Fair Value	8,432,180	8,725,442
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	921,825	917,494
Fair Value	911,923	917,147
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	52,205
Fair Value	52,521
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	644,016
Fair Value	636,542
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	156,769
Fair Value	154,484
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	68,835
Fair Value	68,376
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Amortized Cost	393,331	408,266
Fair Value	388,599	406,363
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	193,937
Fair Value	193,623
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	121,580
Fair Value	120,181
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	34,983
Fair Value	34,152
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	42,831
Fair Value	40,643
State And Municipal Obligations [Member]
Investment [Line Items]
Amortized Cost	1,417,449	1,592,707
Fair Value	1,416,845	1,611,366
State And Municipal Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	157,082
Fair Value	157,746
State And Municipal Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	567,474
Fair Value	569,318
State And Municipal Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	649,164
Fair Value	646,866
State And Municipal Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	43,729
Fair Value	42,915
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	3,003,975	3,046,701
Fair Value	2,954,994	3,040,913
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	966,401	903,920
Fair Value	960,612	905,793
Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,476,947	1,495,380
Fair Value	1,466,035	1,492,800
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	5,447,323	5,446,001
Fair Value	5,381,641	5,439,506
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	340,500	350,988
Fair Value	333,172	$ 351,060
Other Debt Securities [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	3,999
Fair Value	3,981
Other Debt Securities [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	262,778
Fair Value	258,315
Other Debt Securities [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	73,723
Fair Value	$ 70,876

Investment Securities (Availabl

Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Amortized Cost	$ 8,520,428	$ 8,715,456
Available For Sale Securities, Gross Unreailzed Gain at Period End	26,125	54,108
Available For Sale Securities, Gross Unrealized Loss at Period End	(114,373)	(44,122)
Fair Value	8,432,180	8,725,442
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	921,825	917,494
Available For Sale Securities, Gross Unreailzed Gain at Period End	1,617	4,096
Available For Sale Securities, Gross Unrealized Loss at Period End	(11,519)	(4,443)
Fair Value	911,923	917,147
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Amortized Cost	393,331	408,266
Available For Sale Securities, Gross Unreailzed Gain at Period End	0	26
Available For Sale Securities, Gross Unrealized Loss at Period End	(4,732)	(1,929)
Fair Value	388,599	406,363
State And Municipal Obligations [Member]
Investment [Line Items]
Amortized Cost	1,417,449	1,592,707
Available For Sale Securities, Gross Unreailzed Gain at Period End	7,572	21,413
Available For Sale Securities, Gross Unrealized Loss at Period End	(8,176)	(2,754)
Fair Value	1,416,845	1,611,366
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	3,003,975	3,046,701
Available For Sale Securities, Gross Unreailzed Gain at Period End	8,074	17,956
Available For Sale Securities, Gross Unrealized Loss at Period End	(57,055)	(23,744)
Fair Value	2,954,994	3,040,913
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	966,401	903,920
Available For Sale Securities, Gross Unreailzed Gain at Period End	6,530	6,710
Available For Sale Securities, Gross Unrealized Loss at Period End	(12,319)	(4,837)
Fair Value	960,612	905,793
Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,476,947	1,495,380
Available For Sale Securities, Gross Unreailzed Gain at Period End	2,323	2,657
Available For Sale Securities, Gross Unrealized Loss at Period End	(13,235)	(5,237)
Fair Value	1,466,035	1,492,800
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	5,447,323	5,446,001
Available For Sale Securities, Gross Unreailzed Gain at Period End	16,927	27,323
Available For Sale Securities, Gross Unrealized Loss at Period End	(82,609)	(33,818)
Fair Value	5,381,641	5,439,506
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	340,500	350,988
Available For Sale Securities, Gross Unreailzed Gain at Period End	9	1,250
Available For Sale Securities, Gross Unrealized Loss at Period End	(7,337)	(1,178)
Fair Value	$ 333,172	$ 351,060

Investment Securities (Cash Flo

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Mar. 31, 2018
Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	15.00%
Credit support	0.00%
Loss severity	15.00%
Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	52.00%
Credit support	63.00%
Loss severity	63.00%

Investment Securities (Changes

Investment Securities (Changes In Recorded Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 14,213	$ 14,116	$ 14,199	$ 14,080
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	58	0
Credit losses on debt securities for which impairment was previously recognized	10	109
Increase in expected cash flows that are recognized over remaining life of security	$ (54)	$ (73)

Investment Securities (Securiti

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Less than 12 months, Fair Value	$ 5,365,082	$ 4,015,697
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	83,127	24,201
12 months or longer, Fair Value	1,109,738	1,156,715
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	31,246	19,921
Total, Fair Value	6,474,820	5,172,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	114,373	44,122
AFS securities in loss position at period-end, change in unrealized loss	70,300
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	653,945	618,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9,647	4,443
12 months or longer, Fair Value	59,435	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,872	0
Total, Fair Value	713,380	618,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	11,519	4,443
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	338,752	286,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,588	1,712
12 months or longer, Fair Value	49,847	49,766
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	144	217
Total, Fair Value	388,599	336,159
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,732	1,929
State And Municipal Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	529,699	282,843
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,427	1,752
12 months or longer, Fair Value	44,474	49,339
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,749	1,002
Total, Fair Value	574,173	332,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	8,176	2,754
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	1,922,859	1,320,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	35,455	9,433
12 months or longer, Fair Value	591,341	619,300
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	21,600	14,311
Total, Fair Value	2,514,200	1,939,989
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	57,055	23,744
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	729,615	577,017
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9,447	2,966
12 months or longer, Fair Value	137,775	153,813
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,872	1,871
Total, Fair Value	867,390	730,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,319	4,837
Asset-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	884,800	786,048
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	11,101	3,168
12 months or longer, Fair Value	207,087	264,295
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,134	2,069
Total, Fair Value	1,091,887	1,050,343
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	13,235	5,237
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	3,537,274	2,683,754
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	56,003	15,567
12 months or longer, Fair Value	936,203	1,037,408
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	26,606	18,251
Total, Fair Value	4,473,477	3,721,162
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	82,609	33,818
Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	305,412	144,090
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,462	727
12 months or longer, Fair Value	19,779	20,202
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	875	451
Total, Fair Value	325,191	164,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 7,337	$ 1,178

Investment Securities (Proceeds

Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Investment [Line Items]
Proceeds from Sale and Maturity of Available-for-sale Securities		$ 148,637	$ 0
Proceeds from Sale of Equity Securities		15	0
Proceeds from sales of other securities		0	98
Total proceeds	[1]	148,652	98
Fair value adjustments, net		947
Investment securities gains (losses), net	[1]	5,410	(772)
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Realized Gains		212	0
Gain realized on donation		0	2,157
Other-than-temporary impairment recognized on debt securities		(68)	(109)
Equity Securities [Member]
Investment [Line Items]
Gain (Loss) realized on sales		14	0
Fair value adjustments, net		947	0
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales		0	58
Fair value adjustments, net		$ 4,305	$ (2,878)
[1]	Available for sale and non-marketable securities

Goodwill And Other Intangible60

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 321	$ 348

Goodwill And Other Intangible61

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 39,763	$ 39,176
Accumulated Amortization	(31,870)	(31,549)
Valuation Allowance	0	(9)
Net Amount	7,893	7,618
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(28,482)	(28,305)
Valuation Allowance	0	0
Net Amount	2,788	2,965
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,493	7,906
Accumulated Amortization	(3,388)	(3,244)
Valuation Allowance	0	(9)
Net Amount	$ 5,105	$ 4,653

Goodwill And Other Intangible62

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Mar. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 1,202
2,019	1,043
2,020	893
2,021	777
2,022	$ 684

Goodwill And Other Intangible63

Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Goodwill and Intangible Assets [Roll Forward]
Amortization	$ 321	$ 348
Goodwill [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations	0
Amortization	0
Impairment reversal	0
Intangible Assets, Net (Including Goodwill)	138,921		$ 138,921
Core Deposit Premium [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations	0
Amortization	(177)
Impairment reversal	0
Intangible Assets, Net (Including Goodwill)	2,788		2,965
Mortgage Servicing Rights [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations	587
Amortization	(144)
Impairment reversal	9
Intangible Assets, Net (Including Goodwill)	$ 5,105		$ 4,653

Goodwill And Other Intangible64

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 138,921	$ 138,921
Consumer Segment [Member]
Goodwill [Line Items]
Goodwill	70,721	70,721
Commercial Segment [Member]
Goodwill [Line Items]
Goodwill	67,454	67,454
Wealth Segment [Member]
Goodwill [Line Items]
Goodwill	$ 746	$ 746

Guarantees (Details)

Guarantees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Guarantor Obligations [Line Items]
Derivative Liabilities	$ 16,373	$ 8,074
Notional amount of underlying interest rate swaps associated with risk participation agreements	2,016,270	$ 1,963,178
Financial Standby Letter Of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit, net liability	2,300
Contractual amount of letters of credit, guaranteed maximum potential future payments	389,600
Risk Participation Agreement [Member] | Indirect Guarantee Of Indebtedness [Member]
Guarantor Obligations [Line Items]
Derivative Liabilities	91
Notional amount of underlying interest rate swaps associated with risk participation agreements	$ 103,900
Minimum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	2 years
Maximum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	11 years

Pension Pension (Narrative) (De

Pension Pension (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018USD ($)
Pension (Narrative) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 0

Pension (Net Pension Cost) (Det

Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension [Abstract]
Service cost - benefits earned during the period	$ 153	$ 129
Interest cost on projected benefit obligation	950	973
Expected Return on Plan Assets	(1,437)	(1,438)
Amortization of Prior Service Cost	(68)	(68)
Defined Benefit Plan, Amortization of Gain (Loss)	(592)	(617)
Net periodic pension cost	$ 190	$ 213

Common Stock (Summary Of Compon

Common Stock (Summary Of Components Used To Calculate Basic And Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 100,984	$ 71,504
Preferred Stock Dividends	2,250	2,250
Net Income (Loss) Available to Common Stockholders	$ 98,734	$ 69,254
Basic income per common share	$ 0.92	$ 0.65
Diluted income per common share	$ 0.92	$ 0.65
Basic Income Per Common Share [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 100,984	$ 71,504
Preferred Stock Dividends	2,250	2,250
Net Income (Loss) Available to Common Stockholders	98,734	69,254
Less income allocated to nonvested restricted stockholders	1,121	945
Net income available to common stockholders	$ 97,613	$ 68,309
Weighted average common shares outstanding	105,634	105,389
Basic income per common share	$ 0.92	$ 0.65
Diluted Income Per Common Share [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Diluted	$ 98,734	$ 69,254
Less income allocated to nonvested restricted stockholders	1,118	942
Net income available to common stockholders	$ 97,616	$ 68,312
Weighted average common shares outstanding	105,634	105,389
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	332	416
Weighted average diluted common shares outstanding	105,966	105,805
Diluted income per common share	$ 0.92	$ 0.65

Common Stock Common Stock (Anti

Common Stock Common Stock (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	264	90

Accumulated Other Comprehensi70

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income		$ (89,563,000)	$ 30,412,000	$ 14,108,000	$ 10,975,000
Other Comprehensive Income Before Reclassifications		(98,089,000)	32,849,000
Reclassified from Accumulated Oher Comprehensive Income		380,000	(1,499,000)
Other Comprehensive Income (Loss), before Tax		(97,709,000)	31,350,000
Other Comprehensive Income (Loss), Tax		24,426,000	(11,913,000)
Other comprehensive income (loss), net of tax		(73,283,000)	19,437,000
Reclassification Where Impairment Was Not Previously Recognized		0	0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated other comprehensive income	[1]	4,183,000	3,070,000	3,411,000	2,975,000
Other Comprehensive Income Before Reclassifications	[1]	(8,000)	44,000
Reclassified from Accumulated Oher Comprehensive Income	[1]	68,000	109,000
Other Comprehensive Income (Loss), before Tax	[1]	60,000	153,000
Other Comprehensive Income (Loss), Tax	[1]	(15,000)	(58,000)
Other comprehensive income (loss), net of tax	[1]	45,000	95,000
Reclassification Where Impairment Was Not Previously Recognized		12,000	0
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income	[1]	(70,368,000)	46,330,000	30,326,000	27,328,000
Other Comprehensive Income Before Reclassifications	[1]	(98,081,000)	32,805,000
Reclassified from Accumulated Oher Comprehensive Income	[1]	(212,000)	(2,157,000)
Other Comprehensive Income (Loss), before Tax	[1]	(98,293,000)	30,648,000
Other Comprehensive Income (Loss), Tax	[1]	24,572,000	(11,646,000)
Other comprehensive income (loss), net of tax	[1]	(73,721,000)	19,002,000
Reclassification Where Impairment Was Not Previously Recognized		(12,000)	0
Pension Loss [Member]
Accumulated other comprehensive income	[2]	(23,378,000)	(18,988,000)	$ (19,629,000)	$ (19,328,000)
Other Comprehensive Income Before Reclassifications	[2]	0	0
Reclassified from Accumulated Oher Comprehensive Income	[2]	524,000	549,000
Other Comprehensive Income (Loss), before Tax	[2]	524,000	549,000
Other Comprehensive Income (Loss), Tax	[2]	(131,000)	(209,000)
Other comprehensive income (loss), net of tax	[2]	393,000	340,000
Reclassification Where Impairment Was Not Previously Recognized		0	$ 0
Accounting Standards Update 2018-02 Member [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		2,932,000
Accounting Standards Update 2018-02 Member [Member] | Unrealized Gain Loss on Securities OTTI [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		715,000
Accounting Standards Update 2018-02 Member [Member] | Unrealized Gain Loss on Securities Other [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		6,359,000
Accounting Standards Update 2018-02 Member [Member] | Pension Loss [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(4,142,000)
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(33,320,000)
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities OTTI [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities Other [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(33,320,000)
Accounting Standards Update 2016-01 [Member] | Pension Loss [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 0
[1]	The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.
[2]	The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (as shown in the table above) to retained earnings.As mentioned in Note 3, additional new accounting guidance, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income to retained earnings (also shown above).

Segments Segments (Narrative) (

Segments Segments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018USD ($)Locations	Mar. 31, 2017USD ($)
Segments [Abstract]
Number of Operating Segments	3
Segment Reporting Information, Intersegment Revenue | $	$ 0	$ 0
Number Of Locations | Locations	180

Segments (Schedule Of Financial

Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net interest income		$ 192,892	$ 178,273
Provision for loan losses		(10,396)	(11,128)
Non-interest income		119,690	109,613
Investment securities gains (losses), net	[1]	5,410	(772)
Non-interest expense		(182,277)	(179,377)
Income before income taxes		125,319	96,609
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		71,437	67,354
Provision for loan losses		(10,515)	(9,662)
Non-interest income		30,216	27,163
Investment securities gains (losses), net		0	0
Non-interest expense		(70,171)	(67,417)
Income before income taxes		20,967	17,438
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		82,095	79,870
Provision for loan losses		180	513
Non-interest income		49,211	44,910
Investment securities gains (losses), net		0	0
Non-interest expense		(72,798)	(70,365)
Income before income taxes		58,688	54,928
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		11,445	11,844
Provision for loan losses		(64)	(23)
Non-interest income		42,101	37,706
Investment securities gains (losses), net		0	0
Non-interest expense		(31,859)	(30,319)
Income before income taxes		21,623	19,208
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		164,977	159,068
Provision for loan losses		(10,399)	(9,172)
Non-interest income		121,528	109,779
Investment securities gains (losses), net		0	0
Non-interest expense		(174,828)	(168,101)
Income before income taxes		101,278	91,574
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income		27,915	19,205
Provision for loan losses		3	(1,956)
Non-interest income		(1,838)	(166)
Investment securities gains (losses), net		5,410	(772)
Non-interest expense		(7,449)	(11,276)
Income before income taxes		$ 24,041	$ 5,035
[1]	Available for sale and non-marketable securities

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments [Abstract]
Variation Margin Impact to Positive Fair Values of Cleared Swaps	$ 12,200	$ 4,500
Variation Margin Impact to Negative Fair Values of Cleared Swaps	$ 484	$ 4,300

Derivative Instruments (Schedul

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount of Derivatives	$ 2,016,270	$ 1,963,178
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,787,029	1,741,412
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	31,630	31,776
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	153,219	133,488
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	10,907	11,826
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	16,297	17,110
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	688	2,566
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 16,500	$ 25,000

Derivative Instruments (Sched75

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 5,092	$ 8,349
Other liabilities	(16,373)	(8,074)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	4,403	7,674
Other liabilities	(16,120)	(7,857)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	26	16
Other liabilities	(26)	(16)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	29	46
Other liabilities	(91)	(123)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	51	21
Other liabilities	(61)	(40)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	582	580
Other liabilities	0	0
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	8
Other liabilities	0	(7)
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	4
Other liabilities	$ (75)	$ (31)

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	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 1,221	$ 655
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	505	143
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	164	10
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	9	(20)
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	1	554
Loans Fees And Sales [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	0	66
Loans Fees And Sales [Member] | Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 542	$ (98)

Derivative Instruments Deriva77

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	$ 5,092	$ 8,349
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Assets	5,092	8,349
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	16,373	8,074
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liabilities	16,373	8,074
Derivative Subject to Master Netting Agreement [Member]
Derivative Asset, Fair Value, Gross Asset	4,471	7,726
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Net Amount Presented in the Balance Sheet	4,471	7,726
Derivative Asset, Not Offset, Policy Election Deduction	(451)	(233)
derivatve asset, fair value of collateral	(1,505)	(824)
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,515	6,669
Derivative Liability, Fair Value, Gross Liability	16,237	7,935
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Net Amount Presented in the Balance Sheet	16,237	7,935
Derivative Liability, Not Offset, Policy Election Deduction	(451)	(233)
Derivative Liability, Fair Value of Collateral	(1,188)	(1,570)
Derivative Liability, Fair Value, Amount Offset Against Collateral	14,598	6,132
Derivative Not Subject to Master Netting Agreement [Member]
Derivative Asset, Fair Value, Gross Asset	621	623
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	621	623
Derivative Liability, Fair Value, Gross Liability	136	139
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 136	$ 139

Resale and Repurchase Agreeme78

Resale and Repurchase Agreements Resale and Repurchase Agreements (Narrative) (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Collateral Swap Agreements	$ 650	$ 650
Collateral Already Posted, Aggregate Fair Value	659.1
Collateral Accepted, Aggregate Fair Value	$ 659.8

Resale and Repurchase Agreeme79

Resale and Repurchase Agreements Resale and Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Securities purchased under agreements to resell	$ 700,000	$ 700,000
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	1,350,000	1,350,000
Securities Purchased under Agreements to Resell, Liability	(650,000)	(650,000)
Securities purchased under agreements to resell	700,000	700,000
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(700,000)	(700,000)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	0
Repurchase agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	1,677,389	1,954,768
Securities Sold under Agreements to Repurchase, Asset	(650,000)	(650,000)
Securities Sold under Agreements to Repurchase	1,027,389	1,304,768
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,027,389)	(1,304,768)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0

Resale and Repurchase Agreeme80

Resale and Repurchase Agreements Remaining Contractual Maturities of Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
U.S. Government And Federal Agency Obligations [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 217,927	$ 271,820
U.S. Government And Federal Agency Obligations [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	100,000	1,731
U.S. Government And Federal Agency Obligations [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	350,000	450,000
U.S. Government And Federal Agency Obligations [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	667,927	723,551
Government-Sponsored Enterprise Obligations [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	91,930	149,111
Government-Sponsored Enterprise Obligations [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Government-Sponsored Enterprise Obligations [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Government-Sponsored Enterprise Obligations [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	91,930	149,111
Agency Mortgage-Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	486,517	737,975
Agency Mortgage-Backed Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	16,500	9,750
Agency Mortgage-Backed Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	200,000	200,000
Agency Mortgage-Backed Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	703,017	947,725
Non Agency Mortgage Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	13,514	0
Non Agency Mortgage Backed Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non Agency Mortgage Backed Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non Agency Mortgage Backed Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	13,514	0
Asset-Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	73,542	89,601
Asset-Backed Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	65,000	30,000
Asset-Backed Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Asset-Backed Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	138,542	119,601
Other Debt Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	62,459	14,780
Other Debt Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other Debt Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other Debt Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	62,459	14,780
Repurchase Agreements [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	945,889	1,263,287
Repurchase Agreements [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	181,500	41,481
Repurchase Agreements [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	550,000	650,000
Repurchase Agreements [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 1,677,389	$ 1,954,768

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3.3	$ 3.1
Nonvested Stock Award [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Nonvested Stock Award [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	7 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Contractual terms of stock options granted (in years)	10 years

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary Of The Status Of Nonvested Share Awards) (Details)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Nonvested Share Awards [Roll Forward]
Nonvested, Shares, Beginning Balance | shares	1,254,518
Granted, Shares | shares	197,883
Vested, Shares | shares	(266,058)
Forfeited, Shares | shares	(2,604)
Nonvested, Shares, Ending Balance | shares	1,183,739
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 38.67
Granted , Weighted Average Grant Date Fair Value | $ / shares	58.45
Vested , Weighted Average Grant Date Fair Value | $ / shares	32.56
Forfeited , Weighted Average Grant Date Fair Value | $ / shares	49.62
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 43.33

Stock-Based Compensation Stock-

Stock-Based Compensation Stock-Based Compensation (Current Year Per Share Average Fair Value and Valuation Model Assumptions) (Details)	3 Months Ended
	Mar. 31, 2018$ / shares
Current Year Per Share Average Fair Value and Valuation Model Assumptions [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 12.44
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	20.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 7 months

Stock-Based Compensation (Sum84

Stock-Based Compensation (Summary Of SAR Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares	1,151,699	1,179,286
Granted, Shares	168,716
Forfeited, Shares	(323)
Expired, Shares	0
Exercised, Shares	(195,980)
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 37.13
Granted, Weighted Average Exercise Price	58.42
Forfeited, Weighted Average Exercise Price	37.52
Expired, Weighted Average Exercise Price	0
Exercised, Weighted Average Exercise Price	28.93
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 41.65
Outstanding, Weighted Average Remaining Contractual Term (in years)	7 years 5 months
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 21,035

Revenue from Contracts with C85

Revenue from Contracts with Customers Revenue from Contracts with Customers (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018Rate
Revenue from Contract with Customer [Abstract]
Percent of Revenue not in scope of ASC 606	62.00%

Revenue from Contracts with C86

Revenue from Contracts with Customers Reclassification of Bank Card Transaction Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 41,453	$ 35,751
Non-interest income	119,690	109,613
Data processing and software	20,690	19,905
Other	15,374	15,703
Noninterest Expense	$ 182,277	179,377
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		43,204
Non-interest income		117,066
Data processing and software		23,097
Other		19,964
Noninterest Expense		186,830
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		(7,453)
Non-interest income		(7,453)
Data processing and software		(3,192)
Other		(4,261)
Noninterest Expense		(7,453)
Initial Application Period Cumulative Effect Transition [Domain]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		35,751
Non-interest income		109,613
Data processing and software		19,905
Other		15,703
Noninterest Expense		$ 179,377

Revenue from Contracts with C87

Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Non-interest income	$ 119,690	$ 109,613
Revenue from Contracts with Customers In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	111,576	100,953
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Bank Card Transaction Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	41,453	35,751
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Trust Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	36,062	32,014
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Deposit Account Charges and Other Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	22,982	21,942
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Consumer Brokerage Services [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	3,768	3,649
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Other Non-Interest Income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	7,311	7,597
Revenue Not In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	$ 8,114	$ 8,660

Revenue from Contracts with C88

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Bank Card Transaction Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 10,978	$ 13,315	$ 10,810	$ 14,686
Trust Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	3,116	2,802	2,627	2,681
Deposit Account Charges and Other Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	4,682	5,597	4,467	5,735
Consumer Brokerage Services [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 690	$ 380	$ 353	$ 309

Revenue from Contracts with C89

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Bank Card Transaction Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 41,453	$ 35,751
Debit Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	9,391	7,991
Debit Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	9,762	9,641
Debit Card Fees [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(371)	(1,650)
Credit Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	3,101	2,994
Credit Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	6,045	5,740
Credit Card Fees [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(2,944)	(2,746)
Corporate Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	24,168	19,964
Corporate Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	47,876	42,419
Corporate Card Fees [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(23,708)	(22,455)
Merchant Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	4,793	4,802
Merchant Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	7,301	7,939
Merchant Fees [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(783)	(1,048)
Merchant Fees [Member] | Fees to Cardholder Banks [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ (1,725)	$ (2,089)

Revenue from Contracts with C90

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Trust Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Trust Fees [Line Items]
Trust fees	$ 36,062	$ 32,014
Non-interest income	119,690	109,613
Private Client [Member]
Trust Fees [Line Items]
Trust fees	26,868	23,762
Institutional [Member]
Trust Fees [Line Items]
Trust fees	7,411	6,494
Other Trust Fees [Member]
Trust Fees [Line Items]
Trust fees	$ 1,783	$ 1,758

Revenue from Contracts with C91

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Deposit Account Charges and Other Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	$ 22,982	$ 21,942
Non-interest income	119,690	109,613
Corporate Cash Management [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	9,397	8,911
Overdraft and Return Item [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	7,512	7,180
Other Deposit Account Charges [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	$ 6,073	$ 5,851

Revenue from Contracts with C92

Revenue from Contracts with Customers Revenue from Contract with Customers (Schedule of Consumer Brokerage Services) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consumer Brokerage Services [Line Items]
Consumer brokerage services	$ 3,768	$ 3,649
Non-interest income	119,690	109,613
Commission Income [Member]
Consumer Brokerage Services [Line Items]
Consumer brokerage services	2,092	2,230
Managed Account Services [Member]
Consumer Brokerage Services [Line Items]
Consumer brokerage services	$ 1,676	$ 1,419

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments	$ 64,951	$ 55,752
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction Rate Securities Available For Sale	17,200
Private equity investments	$ 64,951	$ 55,752

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 6,480,000	$ 15,327,000
U.S. government and federal agency obligations	911,923,000	917,147,000
Government-sponsored enterprise obligations	388,599,000	406,363,000
State and municipal obligations	1,416,845,000	1,611,366,000
Agency mortgage-backed securities	2,954,994,000	3,040,913,000
Non-agency mortgage-backed securities	960,612,000	905,793,000
Other asset-backed securities	1,466,035,000	1,492,800,000
Other debt securities	333,172,000	351,060,000
Trading securities	32,025,000	18,269,000
Equity securities, FV-NI	49,784,000	48,838,000
Private equity investments	64,951,000	55,752,000
Derivative Assets	5,092,000	8,349,000
Assets held in trust for deferred compensation plan	13,582,000	12,843,000
Total Assets	8,604,094,000	8,884,820,000
Derivative Liabilities	16,373,000	8,074,000
Liabilities held in trust for deferred compensation plan	13,582,000	12,843,000
Total Liabilities	29,955,000	20,917,000
Fair Value, Inputs, 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	911,923,000	917,147,000
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
Other asset-backed securities	0	0
Other debt securities	0	0
Trading securities	0	0
Equity securities, FV-NI	20,151,000	19,864,000
Private equity investments	0	0
Derivative Assets	0	0
Assets held in trust for deferred compensation plan	13,582,000	12,843,000
Total Assets	945,656,000	949,854,000
Derivative Liabilities	0	0
Liabilities held in trust for deferred compensation plan	13,582,000	12,843,000
Total Liabilities	13,582,000	12,843,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	6,480,000	15,327,000
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	388,599,000	406,363,000
State and municipal obligations	1,399,687,000	1,594,350,000
Agency mortgage-backed securities	2,954,994,000	3,040,913,000
Non-agency mortgage-backed securities	960,612,000	905,793,000
Other asset-backed securities	1,466,035,000	1,492,800,000
Other debt securities	333,172,000	351,060,000
Trading securities	32,025,000	18,269,000
Equity securities, FV-NI	29,633,000	28,974,000
Private equity investments	0	0
Derivative Assets	4,481,000	7,723,000
Assets held in trust for deferred compensation plan	0	0
Total Assets	7,575,718,000	7,861,572,000
Derivative Liabilities	16,282,000	7,951,000
Liabilities held in trust for deferred compensation plan	0	0
Total Liabilities	16,282,000	7,951,000
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	17,158,000	17,016,000
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Other asset-backed securities	0	0
Other debt securities	0	0
Trading securities	0	0
Equity securities, FV-NI	0	0
Private equity investments	64,951,000	55,752,000
Derivative Assets	611,000	626,000
Assets held in trust for deferred compensation plan	0	0
Total Assets	82,720,000	73,394,000
Derivative Liabilities	91,000	123,000
Liabilities held in trust for deferred compensation plan	0	0
Total Liabilities	$ 91,000	$ 123,000

Fair Value Measurements (Summ95

Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 73,271,000	$ 67,760,000
Total gains or losses (realized /unrealized), included in earnings	4,470,000	(2,314,000)
Total gains or losses (realized /unrealized), included in other comprehensive income	133,000	391,000
Discount accretion	9,000	10,000
Purchase of private equity securities	4,879,000	4,825,000
Sales And Repayments Of Private Equity Securities	(20,000)	0
Capitalized interest/dividends	35,000	33,000
Sale Of Risk Participation Agreement	(148,000)	0
Ending balance	82,629,000	70,705,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	5,050,000	(1,965,000)
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	17,016,000	16,682,000
Total gains or losses (realized /unrealized), included in earnings	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	133,000	391,000
Discount accretion	9,000	10,000
Purchase of private equity securities	0	0
Sales And Repayments Of Private Equity Securities	0	0
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	0	0
Ending balance	17,158,000	17,083,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	0	0
Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	55,752,000	50,820,000
Total gains or losses (realized /unrealized), included in earnings	4,305,000	(2,878,000)
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0
Discount accretion	0	0
Purchase of private equity securities	4,879,000	4,825,000
Sales And Repayments Of Private Equity Securities	(20,000)	0
Capitalized interest/dividends	35,000	33,000
Sale Of Risk Participation Agreement	0	0
Ending balance	64,951,000	52,800,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	4,305,000	(2,878,000)
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	503,000	258,000
Total gains or losses (realized /unrealized), included in earnings	165,000	564,000
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0
Discount accretion	0	0
Purchase of private equity securities	0	0
Sales And Repayments Of Private Equity Securities	0	0
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	(148,000)	0
Ending balance	520,000	822,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 745,000	$ 913,000

Fair Value Measurements (Summ96

Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 4,470	$ (2,314)
Change in unrealized gains or losses relating to assets still held	5,050	(1,965)
Loans Fees And Sales [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	2	554
Change in unrealized gains or losses relating to assets still held	582	903
Other Non-Interest Income [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	163	10
Change in unrealized gains or losses relating to assets still held	163	10
Investment Securities Gains (Losses), Net [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	4,305	(2,878)
Change in unrealized gains or losses relating to assets still held	$ 4,305	$ (2,878)

Fair Value Measurements (Summ97

Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details)	3 Months Ended
	Mar. 31, 2018Rate
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Unobservable Input, Estimated market recovery period	5 years
Auction Rate Securities [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input, Estimated market rate	3.60%
Auction Rate Securities [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input, Estimated market rate	3.90%
Private Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Market comparable companies	Market comparable companies
Private Equity Investments [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	4
Private Equity Investments [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6
Mortgage Loan Commitments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Weighted Average, Probability of Funding	78.50%
Weighted Average, Embedded Servicing Value	1.30%
Mortgage Loan Commitments [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	51.40%
Embedded Servicing Value	0.10%
Mortgage Loan Commitments [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	99.10%
Embedded Servicing Value	2.40%

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 39		$ 1,349
Loans Nonrecurring Basis Gains (Losses)	(12)	$ (340)
Mortgage servicing rights	5,105		3,106
Mortgage Servicing Rights Nonrecurring Basis Gains (Losses)	9	7
Foreclosed assets	0		95
Foreclosed Assets Nonrecurring Basis Gains (Losses)	0	(29)
Long-lived assets	914		1,316
Long Lived Assets Nonrecurring Basis Gains (Losses)	(552)	$ (193)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0		0
Mortgage servicing rights	0		0
Foreclosed assets	0		0
Long-lived assets	0		0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0		0
Mortgage servicing rights	0		0
Foreclosed assets	0		0
Long-lived assets	0		0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	39		1,349
Mortgage servicing rights	5,105		3,106
Foreclosed assets	0		95
Long-lived assets	$ 914		$ 1,316

Fair Value Of Financial Instr99

Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	$ 6,500
Securities purchased under agreements to resell	700,000	$ 700,000
Interest earning deposits with banks	134,697	30,631
Cash and due from banks	423,048	438,439
Derivative Assets	5,092	8,349
Assets held in trust for deferred compensation plan	13,582	12,843
Non-interest bearing deposits	6,953,430	7,158,962
Savings, interest checking and money market deposits	11,828,138	11,499,620
Other Borrowings	9,214	1,758
Derivative Liabilities	16,373	8,074
Liabilities held in trust for deferred compensation plan	13,582	12,843
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	0	0
Assets held in trust for deferred compensation plan	13,582	12,843
Derivative Liabilities	0	0
Liabilities held in trust for deferred compensation plan	13,582	12,843
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	4,481	7,723
Assets held in trust for deferred compensation plan	0	0
Derivative Liabilities	16,282	7,951
Liabilities held in trust for deferred compensation plan	0	0
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	611	626
Assets held in trust for deferred compensation plan	0	0
Derivative Liabilities	91	123
Liabilities held in trust for deferred compensation plan	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,893,361	13,983,674
Loans held for sale	16,435	21,398
Investments, Fair Value Disclosure	8,624,037	8,893,307
Federal funds sold	17,000	42,775
Securities purchased under agreements to resell	700,000	700,000
Interest earning deposits with banks	134,697	30,631
Cash and due from banks	423,048	438,439
Derivative Assets	5,092	8,349
Assets held in trust for deferred compensation plan	13,582	12,843
Assets, Fair Value Disclosure	23,827,252	24,131,416
Non-interest bearing deposits	6,953,430	7,158,962
Savings, interest checking and money market deposits	11,828,138	11,499,620
Time open and certificates of deposits	1,756,903	1,766,864
Federal Funds Purchased, Fair Value Disclosure	104,940	202,370
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	1,027,389	1,304,768
Other Borrowings	9,214	1,758
Derivative Liabilities	16,373	8,074
Liabilities held in trust for deferred compensation plan	13,582	12,843
Financial Liabilities Fair Value Disclosure	21,709,969	21,955,259
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,960,614	4,958,554
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	932,058	968,820
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,724,584	2,697,452
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,069,012	2,062,787
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,069,235	2,104,487
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	382,825	400,587
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	752,651	783,864
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,382	7,123
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,601,017	13,993,509
Loans held for sale	16,435	21,398
Investments, Fair Value Disclosure	8,624,037	8,893,307
Federal funds sold	17,000	42,775
Securities purchased under agreements to resell	685,539	695,194
Interest earning deposits with banks	134,697	30,631
Cash and due from banks	423,048	438,439
Derivative Assets	5,092	8,349
Assets held in trust for deferred compensation plan	13,582	12,843
Assets, Fair Value Disclosure	23,520,447	24,136,445
Non-interest bearing deposits	6,953,430	7,158,962
Savings, interest checking and money market deposits	11,828,138	11,499,620
Time open and certificates of deposits	1,755,581	1,768,780
Federal Funds Purchased, Fair Value Disclosure	104,940	202,370
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	1,027,814	1,305,375
Other Borrowings	9,214	1,758
Derivative Liabilities	16,373	8,074
Liabilities held in trust for deferred compensation plan	13,582	12,843
Financial Liabilities Fair Value Disclosure	21,709,072	21,957,782
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,861,150	4,971,401
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	927,316	979,389
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,690,305	2,702,598
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,009,625	2,060,443
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,032,968	2,074,129
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	376,043	400,333
Estimate of Fair Value, Fair Value Disclosure [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	701,833	798,093
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,777	7,123
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Loans held for sale	0	0
Investments, Fair Value Disclosure	932,074	937,011
Federal funds sold	17,000	42,775
Securities purchased under agreements to resell	0	0
Interest earning deposits with banks	134,697	30,631
Cash and due from banks	423,048	438,439
Derivative Assets	0	0
Assets held in trust for deferred compensation plan	13,582	12,843
Assets, Fair Value Disclosure	1,520,401	1,461,699
Non-interest bearing deposits	6,953,430	7,158,962
Savings, interest checking and money market deposits	11,828,138	11,499,620
Time open and certificates of deposits	0	0
Federal Funds Purchased, Fair Value Disclosure	104,940	202,370
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	0	0
Other Borrowings	0	0
Derivative Liabilities	0	0
Liabilities held in trust for deferred compensation plan	13,582	12,843
Financial Liabilities Fair Value Disclosure	18,900,090	18,873,795
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Loans held for sale	16,435	21,398
Investments, Fair Value Disclosure	7,564,757	7,838,522
Federal funds sold	0	0
Securities purchased under agreements to resell	0	0
Interest earning deposits with banks	0	0
Cash and due from banks	0	0
Derivative Assets	4,481	7,723
Assets held in trust for deferred compensation plan	0	0
Assets, Fair Value Disclosure	7,585,673	7,867,643
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Time open and certificates of deposits	0	0
Federal Funds Purchased, Fair Value Disclosure	0	0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	0	0
Other Borrowings	7,530	0
Derivative Liabilities	16,282	7,951
Liabilities held in trust for deferred compensation plan	0	0
Financial Liabilities Fair Value Disclosure	23,812	7,951
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,601,017	13,993,509
Loans held for sale	0	0
Investments, Fair Value Disclosure	127,206	117,774
Federal funds sold	0	0
Securities purchased under agreements to resell	685,539	695,194
Interest earning deposits with banks	0	0
Cash and due from banks	0	0
Derivative Assets	611	626
Assets held in trust for deferred compensation plan	0	0
Assets, Fair Value Disclosure	14,414,373	14,807,103
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Time open and certificates of deposits	1,755,581	1,768,780
Federal Funds Purchased, Fair Value Disclosure	0	0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	1,027,814	1,305,375
Other Borrowings	1,684	1,758
Derivative Liabilities	91	123
Liabilities held in trust for deferred compensation plan	0	0
Financial Liabilities Fair Value Disclosure	2,785,170	3,076,036
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,861,150	4,971,401
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	927,316	979,389
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,690,305	2,702,598
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,009,625	2,060,443
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,032,968	2,074,129
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	376,043	400,333
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	701,833	798,093
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 1,777	$ 7,123