Commerce Bancshares (CBSH) 10-Q 5 Nov 15 2015 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 02, 2015
Document And Entity Information [Abstract]
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Type	10-Q
Amendment Flag	false
Document Fiscal Period Focus	Q3
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		92,822,618

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Loans	$ 12,224,274	$ 11,469,238
Allowance for loan losses	(151,532)	(156,532)
Net loans	12,072,742	11,312,706
Loans held for sale, at fair value	4,143	0
Investment securities:
Available for sale	9,472,959	9,523,560
Trading	14,463	15,357
Non-marketable	116,634	106,875
Total investment securities	9,604,056	9,645,792
Federal funds sold and short-term securities purchased under agreements to resell	32,550	32,485
Long-term securities purchased under agreements to resell	975,000	1,050,000
Interest earning deposits with banks	42,078	600,744
Cash and due from banks	384,122	467,488
Land, buildings and equipment, net	351,946	357,871
Goodwill	138,921	138,921
Other intangible assets, net	6,826	7,450
Other assets	355,264	380,823
Total assets	23,967,648	23,994,280
LIABILITIES AND EQUITY
Non-interest bearing	6,699,873	6,811,959
Savings, interest checking and money market	10,295,260	10,541,601
Time open and C.D.'s of less than $100,000	808,210	878,433
Time open and C.D.'s of $100,000 and over	1,183,417	1,243,785
Total deposits	18,986,760	19,475,778
Federal funds purchased and securities sold under agreements to repurchase	2,193,197	1,862,518
Other Borrowings	103,831	104,058
Other liabilities	312,817	217,680
Total liabilities	21,596,605	21,660,034
Commerce Bancshares, Inc. stockholders' equity:
Preferred Stock, Value, Outstanding	144,784	144,784
Common stock	484,155	484,155
Capital surplus	1,283,346	1,229,075
Retained earnings	555,877	426,648
Treasury stock, at cost	(168,493)	(16,562)
Accumulated other comprehensive income	65,636	62,093
Total Commerce Bancshares, Inc. stockholders' equity	2,365,305	2,330,193
Non-controlling interest	5,738	4,053
Total equity	2,371,043	2,334,246
Total liabilities and equity	$ 23,967,648	$ 23,994,280

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 2,173,000	$ 0
Investment Securities:
Available-for-sale Securities Pledged as Collateral	$ 364,097,000	$ 467,143,000
Stockholders' Equity:
Preferred stock, par value	$ 0	$ 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	96,830,977	96,830,977
Treasury stock, shares	3,827,141	367,487

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
INTEREST INCOME
Interest and fees on loans	$ 114,954	$ 112,688	$ 339,707		$ 334,886
Interest and fees on loans held for sale	48	0	108		0
Interest on investment securities	50,716	46,338	142,416		144,373
Interest on federal funds sold and short-term securities purchased under agreements to resell	21	30	45		80
Interest on long-term securities purchased under agreements to resell	3,273	2,684	9,994		9,778
Interest on deposits with banks	103	71	404		259
Total interest income	169,115	161,811	492,674		489,376
INTEREST EXPENSE
Savings, interest checking and money market	3,356	3,400	9,951		10,064
Time open and C.D.'s of less than $100,000	786	1,010	2,484		3,193
Time open and C.D.'s of $100,000 and over	1,554	1,518	4,468		4,485
Interest on federal funds purchased and securities sold under agreements to repurchase	483	287	1,271		753
Interest on other borrowings	898	880	2,667		2,606
Total interest expense	7,077	7,095	20,841		21,101
Net interest income	162,038	154,716	471,833		468,275
Provision for loan losses	8,364	7,652	19,541		24,867
Net interest income after provision for loan losses	153,674	147,064	452,292		443,408
NON-INTEREST INCOME
Bank card transaction fees	44,635	44,802	132,606		130,963
Trust fees	29,630	28,560	89,747		82,898
Deposit account charges and other fees	20,674	20,161	58,810		58,460
Capital market fees	2,620	2,783	8,360		9,899
Consumer brokerage services	3,547	3,098	10,099		8,817
Loan fees and sales	1,855	1,367	6,127		3,787
Other	8,187	11,515	25,917		28,852
Total non-interest income	111,148	112,286	331,666		323,676
INVESTMENT SECURITIES GAINS (LOSSES), NET
Change in fair value of other-than-temporary impaired securities	(568)	(770)	(883)		(1,618)
Portion recognized in other comprehensive income	568	399	400		270
Net impairment gains (losses) recognized in earnings	0	(371)	(483)		(1,348)
Realized gains (losses) on sales and fair value adjustments	(378)	3,366	8,283		11,822
Investment securities gains (losses), net	(378)	2,995	7,800	[1]	10,474	[1]
NON-INTEREST EXPENSE
Salaries and employee benefits	100,874	95,462	298,603		284,574
Net occupancy	11,247	11,585	33,807		34,352
Equipment	4,789	4,593	14,171		13,622
Supplies and communication	5,609	5,302	16,416		16,487
Data processing and software	21,119	19,968	61,670		58,633
Marketing	4,343	4,074	12,568		11,704
Deposit insurance	2,981	2,899	9,001		8,685
Other	20,300	17,957	54,043		58,298
Total non-interest expense	171,262	161,840	500,279		486,355
Income before income taxes	93,182	100,505	291,479		291,203
Less income taxes	27,969	31,484	88,929		92,161
Net income	65,213	69,021	202,550		199,042
Less non-controlling interest expense	601	836	2,530		13
Net income attributable to Commerce Bancshares, Inc.	64,612	68,185	200,020		199,029
Preferred Stock Dividends	2,250	1,800	6,750		1,800
Net Income (Loss) Available to Common Stockholders	$ 62,362	$ 66,385	$ 193,270		$ 197,229
Net income per common share - basic	$ 0.67	$ 0.69	$ 2.03		$ 2
Net income per common share - diluted	$ 0.66	$ 0.69	$ 2.02		$ 1.99
[1]	Available for sale and non-marketable securities

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 65,213	$ 69,021	$ 202,550	$ 199,042
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	(327)	(244)	(306)	(136)
Net unrealized gains (losses) on other securities	16,891	(24,062)	2,754	49,967
Pension loss amortization	283	223	1,095	669
Other comprehensive income (loss), net of tax	16,847	(24,083)	3,543	50,500
Comprehensive income	82,060	44,938	206,093	249,542
Non-controlling interest expense	601	836	2,530	13
Comprehensive income attributable to Commerce Bancshares, Inc	$ 81,459	$ 44,102	$ 203,563	$ 249,529

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]
Balance at Dec. 31, 2013	$ 2,214,397	$ 0	$ 481,224	$ 1,279,948	$ 449,836	$ (10,097)	$ 9,731	$ 3,755
Net income	199,042				199,029			13
Other comprehensive income (loss)	50,500						50,500
Distributions to non-controlling interest	(730)							(730)
Issuance of preferred stock	144,784	144,784
Purchase of treasury stock	(69,040)					$ (69,040)
Accelerated share repurchase agreement	(200,000)			$ (60,000)		(140,000)
Issuance of stock under purchase and equity compensation plans	7,203			(12,304)		19,507
Net tax benefit related to equity compensation plans	1,457			1,457
Stock-based compensation	6,631			6,631
Cash dividends per share, Common Stock, Cash	(63,575)				(63,575)
Dividends per share, Preferred Stock, Cash	(1,800)				(1,800)
Balance at Sep. 30, 2014	2,288,869	144,784	$ 481,224	1,215,732	583,490	(199,630)	60,231	3,038
Balance at Dec. 31, 2014	2,334,246	144,784	484,155	1,229,075	426,648	(16,562)	62,093	4,053
Net income	202,550				200,020			2,530
Other comprehensive income (loss)	3,543						3,543
Distributions to non-controlling interest	(845)							(845)
Purchase of treasury stock	(9,147)					(9,147)
Accelerated share repurchase agreement	(100,000)			(20,000)		(80,000)
Settlement of accelerated share repurchase agreements	0			80,000		(80,000)
Issuance of stock under purchase and equity compensation plans	1,914			(15,302)		17,216
Net tax benefit related to equity compensation plans	1,871			1,871
Stock-based compensation	7,702			7,702
Cash dividends per share, Common Stock, Cash	(64,041)				(64,041)
Dividends per share, Preferred Stock, Cash	(6,750)				(6,750)
Balance at Sep. 30, 2015	$ 2,371,043	$ 144,784	$ 484,155	$ 1,283,346	$ 555,877	$ (168,493)	$ 65,636	$ 5,738

Consolidated Statements Of Cha7

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, per share, cash paid	$ 0.675	$ 0.643
Preferred Stock, Dividends, per share, cash paid	$ 1.125	$ 0.3

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES:
Net income		$ 202,550	$ 199,042
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		19,541	24,867
Provision for depreciation and amortization		32,100	31,561
Amortization of investment security premiums, net		23,249	14,473
Investment securities gains (losses), net	[1]	(7,800)	(10,474)
Net gains on sales of loans held for sale		(2,184)	0
Origination Of Loans Held For Sale		(75,589)	0
Proceeds from sales of loans held for sale		72,973	0
Net (increase) decrease in trading securities		(5,042)	14,555
Stock-based compensation		7,702	6,631
(Increase) decrease in interest receivable		(2,652)	(2,215)
Increase (decrease) in interest payable		(96)	(277)
Increase (decrease) in income taxes payable		16,312	4,880
Net tax benefit related to equity compensation plans		(1,871)	(1,457)
Other changes, net		(365)	4,043
Net cash provided by (used in) operating activities		278,828	285,629
INVESTING ACTIVITIES:
Cash paid in sales of branches		0	(43,827)
Proceeds from sales of investment securities	[1]	684,893	64,041
Proceeds from maturities/pay downs of investment securities(A)	[1]	1,923,785	1,392,422
Purchases of investment securities	[1]	(2,507,803)	(1,314,248)
Net (increase) decrease in loans		(782,559)	(527,528)
Long-term securities purchased under agreements to resell		0	(250,000)
Repayments of long-term securities purchased under agreements to resell		75,000	500,000
Purchases of land, buildings and equipment		(22,718)	(34,205)
Sales of land, buildings and equipment		4,752	2,983
Net cash provided by (used in) investing activities		(624,650)	(210,362)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(319,853)	(470,427)
Net increase (decrease) in time open and C.D.'s		(130,591)	(17,295)
Repayment of long-term securities sold under agreements to repurchase		0	(350,000)
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase		330,679	398,602
Repayment of long-term borrowings		(227)	(233)
Net increase (decrease) in other short-term borrowings		0	(2,000)
Proceeds from issuance of preferred stock		0	144,784
Purchases of treasury stock		(9,147)	(69,040)
Accelerated stock repurchase agreement		(100,000)	(200,000)
Issuance of stock under equity compensation plans		1,914	7,203
Net tax benefit related to equity compensation plans		1,871	1,457
Cash dividends paid on common stock		(64,041)	(63,575)
Cash dividends paid on preferred stock		(6,750)	(1,800)
Net cash provided by (used in) financing activities		(296,145)	(622,324)
Increase (decrease) in cash and cash equivalents		(641,967)	(547,057)
Cash and cash equivalents at beginning of year		1,100,717	1,269,514
Cash and cash equivalents at end of period		458,750	722,457
Supplemental Cash Flow Information:
Income tax payments, net		70,860	86,002
Interest paid on deposits and borrowings		20,937	21,278
Loans transferred to foreclosed real estate		2,459	4,421
Settlement of accelerated share repurchase agreement and receipt of treasury stock		$ 60,000	$ 0
[1]	Available for sale and non-marketable securities

Principles Of Consolidation And

Principles Of Consolidation And Presentation	9 Months Ended
	Sep. 30, 2015
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 2014 data to conform to current year presentation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Management has evaluated subsequent events for potential recognition or disclosure. The results of operations for the three and nine month periods ended September 30, 2015 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. The Company invests in low-income housing partnerships which supply funds for the construction and operation of apartment complexes that provide affordable housing to lower income families. As permitted by ASU 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects," issued by the Financial Accounting Standards Board, the Company adopted a new method of accounting for these investments on January 1, 2015. The new method is the practical expedient to the proportional amortization method, which allows the Company to record the amortization of its investments in income tax expense, rather than in non-interest expense. The Company made this change because it believes that presenting the investment performance net of taxes more fairly represents the economics and returns on such investments. The amortization recognized as a component of income tax expense for the nine months ended September 30, 2015 was $1.5 million . As required by the ASU, all prior period information in this report has been revised to reflect the adoption, resulting in a decrease to non-interest expense and an increase to income tax expense (as originally reported) of $1.1 million for the nine months ended September 30, 2014 .

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	9 Months Ended
	Sep. 30, 2015
Loans And Allowance For Loan Losses [Abstract]
Loans And Allowance For Loan Losses	Loans and Allowance for Loan Losses Major classifications within the Company’s held for investment loan portfolio at September 30, 2015 and December 31, 2014 are as follows: (In thousands) September 30, 2015 December 31, 2014 Commercial: Business $ 4,406,854 $ 3,969,952 Real estate – construction and land 534,425 403,507 Real estate – business 2,286,013 2,288,215 Personal Banking: Real estate – personal 1,920,650 1,883,092 Consumer 1,886,806 1,705,134 Revolving home equity 428,940 430,873 Consumer credit card 756,093 782,370 Overdrafts 4,493 6,095 Total loans $ 12,224,274 $ 11,469,238 At September 30, 2015 , loans of $3.6 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 $1.4 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 and nine months ended September 30, 2015 and 2014 , respectively, follows: For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Balance at beginning of period $ 86,329 $ 65,203 $ 151,532 $ 89,622 $ 66,910 $ 156,532 Provision (1,976 ) 10,340 8,364 (6,089 ) 25,630 19,541 Deductions: Loans charged off 903 11,321 12,224 3,035 34,194 37,229 Less recoveries on loans 1,167 2,693 3,860 4,119 8,569 12,688 Net loan charge-offs (recoveries) (264 ) 8,628 8,364 (1,084 ) 25,625 24,541 Balance September 30, 2015 $ 84,617 $ 66,915 $ 151,532 $ 84,617 $ 66,915 $ 151,532 Balance at beginning of period $ 98,928 $ 62,604 $ 161,532 $ 94,189 $ 67,343 $ 161,532 Provision (717 ) 8,369 7,652 3,836 21,031 24,867 Deductions: Loans charged off 686 11,414 12,100 3,034 35,917 38,951 Less recoveries on loans 1,431 3,017 4,448 3,965 10,119 14,084 Net loan charge-offs (recoveries) (745 ) 8,397 7,652 (931 ) 25,798 24,867 Balance September 30, 2014 $ 98,956 $ 62,576 $ 161,532 $ 98,956 $ 62,576 $ 161,532 The following table shows the balance in the allowance for loan losses and the related loan balance at September 30, 2015 and December 31, 2014 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under ASC 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans 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 September 30, 2015 Commercial $ 1,829 $ 32,513 $ 82,788 $ 7,194,779 Personal Banking 1,667 22,868 65,248 4,974,114 Total $ 3,496 $ 55,381 $ 148,036 $ 12,168,893 December 31, 2014 Commercial $ 4,527 $ 55,551 $ 85,095 $ 6,606,123 Personal Banking 2,314 25,537 64,596 4,782,027 Total $ 6,841 $ 81,088 $ 149,691 $ 11,388,150 Impaired loans The table below shows the Company’s investment in impaired loans at September 30, 2015 and December 31, 2014 . These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings under ASC 310-40. 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) Sept. 30, 2015 Dec. 31, 2014 Non-accrual loans $ 25,779 $ 40,775 Restructured loans (accruing) 29,602 40,313 Total impaired loans $ 55,381 $ 81,088 The following table provides additional information about impaired loans held by the Company at September 30, 2015 and December 31, 2014 , segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided. (In thousands) Recorded Investment Unpaid Principal Balance Related Allowance September 30, 2015 With no related allowance recorded: Business $ 9,692 $ 11,866 $ — Real estate – construction and land 2,072 7,679 — Real estate – business 1,535 2,969 — $ 13,299 $ 22,514 $ — With an allowance recorded: Business $ 8,292 $ 10,252 $ 681 Real estate – construction and land 3,327 4,939 288 Real estate – business 7,595 11,084 860 Real estate – personal 8,652 11,835 1,015 Consumer 5,461 5,461 70 Revolving home equity 492 492 13 Consumer credit card 8,263 8,263 569 $ 42,082 $ 52,326 $ 3,496 Total $ 55,381 $ 74,840 $ 3,496 December 31, 2014 With no related allowance recorded: Business $ 9,237 $ 11,532 $ — Real estate – construction and land 4,552 8,493 — Real estate – business 13,453 17,258 — Revolving home equity 1,227 1,384 — $ 28,469 $ 38,667 $ — With an allowance recorded: Business $ 12,326 $ 13,846 $ 1,844 Real estate – construction and land 8,148 9,610 1,081 Real estate – business 7,835 15,025 1,602 Real estate – personal 9,096 12,465 1,441 Consumer 4,244 4,244 50 Revolving home equity 529 529 9 Consumer credit card 10,441 10,441 814 $ 52,619 $ 66,160 $ 6,841 Total $ 81,088 $ 104,827 $ 6,841 Total average impaired loans for the three and nine month periods ended September 30, 2015 and 2014 , respectively, are shown in the table below. (In thousands) Commercial Personal Banking Total Average Impaired Loans: For the three months ended September 30, 2015 Non-accrual loans $ 21,119 $ 5,179 $ 26,298 Restructured loans (accruing) 13,399 18,221 31,620 Total $ 34,518 $ 23,400 $ 57,918 For the nine months ended September 30, 2015 Non-accrual loans $ 25,784 $ 5,791 $ 31,575 Restructured loans (accruing) 16,612 18,854 35,466 Total $ 42,396 $ 24,645 $ 67,041 For the three months ended September 30, 2014 Non-accrual loans $ 38,111 $ 7,267 $ 45,378 Restructured loans (accruing) 32,970 19,822 52,792 Total $ 71,081 $ 27,089 $ 98,170 For the nine months ended September 30, 2014 Non-accrual loans $ 38,099 $ 7,320 $ 45,419 Restructured loans (accruing) 37,157 20,660 57,817 Total $ 75,256 $ 27,980 $ 103,236 The table below shows interest income recognized during the three and nine month periods ended September 30, 2015 and 2014 , respectively, for impaired loans held at the end of each respective period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section on page 14. For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) 2015 2014 2015 2014 Interest income recognized on impaired loans: Business $ 63 $ 146 $ 188 $ 438 Real estate – construction and land 22 97 66 290 Real estate – business 33 58 99 173 Real estate – personal 47 53 142 160 Consumer 87 72 261 215 Revolving home equity 6 7 17 20 Consumer credit card 186 236 558 707 Total $ 444 $ 669 $ 1,331 $ 2,003 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 September 30, 2015 and December 31, 2014 . (In thousands) Current or Less Than 30 Days Past Due 30 – 89 Days Past Due 90 Days Past Due and Still Accruing Non-accrual Total September 30, 2015 Commercial: Business $ 4,391,674 $ 3,106 $ 375 $ 11,699 $ 4,406,854 Real estate – construction and land 529,117 1,262 — 4,046 534,425 Real estate – business 2,277,384 3,575 — 5,054 2,286,013 Personal Banking: Real estate – personal 1,904,280 8,695 2,695 4,980 1,920,650 Consumer 1,867,657 17,244 1,905 — 1,886,806 Revolving home equity 423,939 2,512 2,489 — 428,940 Consumer credit card 740,124 8,726 7,243 — 756,093 Overdrafts 4,204 289 — — 4,493 Total $ 12,138,379 $ 45,409 $ 14,707 $ 25,779 $ 12,224,274 December 31, 2014 Commercial: Business $ 3,946,144 $ 11,152 $ 1,096 $ 11,560 $ 3,969,952 Real estate – construction and land 397,488 827 35 5,157 403,507 Real estate – business 2,266,688 3,661 — 17,866 2,288,215 Personal Banking: Real estate – personal 1,868,606 6,618 1,676 6,192 1,883,092 Consumer 1,687,285 16,053 1,796 — 1,705,134 Revolving home equity 428,478 1,552 843 — 430,873 Consumer credit card 764,599 9,559 8,212 — 782,370 Overdrafts 5,721 374 — — 6,095 Total $ 11,365,009 $ 49,796 $ 13,658 $ 40,775 $ 11,469,238 Credit quality The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is 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 September 30, 2015 Pass $ 4,304,836 $ 527,590 $ 2,211,387 $ 7,043,813 Special mention 59,526 1,021 19,576 80,123 Substandard 30,793 1,768 49,996 82,557 Non-accrual 11,699 4,046 5,054 20,799 Total $ 4,406,854 $ 534,425 $ 2,286,013 $ 7,227,292 December 31, 2014 Pass $ 3,871,569 $ 385,831 $ 2,184,541 $ 6,441,941 Special mention 62,904 3,865 40,668 107,437 Substandard 23,919 8,654 45,140 77,713 Non-accrual 11,560 5,157 17,866 34,583 Total $ 3,969,952 $ 403,507 $ 2,288,215 $ 6,661,674 The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above "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 Banking loans for which FICO scores are not obtained because they generally pertain to commercial customer activities and are often underwritten with other collateral considerations. At September 30, 2015 , these were comprised of $256.9 million in personal real estate loans, or 5.1% of the Personal Banking portfolio, compared to $244.3 million at December 31, 2014 . For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at September 30, 2015 and December 31, 2014 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card September 30, 2015 FICO score: Under 600 1.5 % 4.6 % 1.6 % 3.8 % 600 - 659 2.8 9.5 4.2 12.1 660 - 719 9.1 22.5 13.7 32.6 720 - 779 25.3 27.0 26.2 28.1 780 and over 61.3 36.4 54.3 23.4 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2014 FICO score: Under 600 1.4 % 5.2 % 1.8 % 4.1 % 600 - 659 3.1 10.2 4.4 11.8 660 - 719 9.9 22.9 13.7 32.4 720 - 779 26.7 28.0 32.8 27.8 780 and over 58.9 33.7 47.3 23.9 Total 100.0 % 100.0 % 100.0 % 100.0 % Troubled debt restructurings As mentioned previously, the Company's impaired loans include loans which have been classified as troubled debt restructurings. Total restructured loans amounted to $46.7 million at September 30, 2015 . Restructured loans are those extended to borrowers who are experiencing financial difficulty and who have been granted a concession. Restructured loans are placed on non-accrual status if the Company does not believe it probable that amounts due under the contractual terms will be collected, and those non-accrual loans totaled $17.1 million at September 30, 2015 . Other performing restructured loans totaled $29.6 million at September 30, 2015 . These include 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 the loans were classified as troubled debt restructurings. These commercial loans totaled $12.5 million at September 30, 2015 . These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. Troubled debt restructurings also include certain credit card loans under various debt management and assistance programs, which totaled $8.3 million at September 30, 2015 . 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 has classified additional loans as troubled debt restructurings because they were not reaffirmed by the borrower in bankruptcy proceedings. At September 30, 2015 , these loans totaled $8.5 million in 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 under the terms of the loan agreements. The following table shows the outstanding balances of loans classified as troubled debt restructurings at September 30, 2015 , in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal. (In thousands) September 30, 2015 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 16,441 $ — Real estate - construction and land 5,222 1,499 Real estate - business 5,502 — Personal Banking: Real estate - personal 5,276 — Consumer 5,487 57 Revolving home equity 492 49 Consumer credit card 8,263 541 Total restructured loans $ 46,683 $ 2,146 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 $1.0 million on an annual, pre-tax basis, compared to amounts contractually owed. The allowance for loan losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. Those performing loans classified as troubled debt restructurings are accruing loans which management expects to collect under contractual terms. Performing commercial loans have had no other concessions granted other than being renewed at an interest rate judged not to be market. As such, they have similar risk characteristics as non-troubled debt commercial loans and are collectively evaluated based on internal risk rating, loan type, delinquency, historical experience and current economic factors. Performing personal banking loans classified as troubled debt restructurings resulted from the borrower not reaffirming the debt during bankruptcy and have had no other concession granted, other than the Bank's future limitations on collecting payment deficiencies or in pursuing foreclosure actions. As such, they have similar risk characteristics as non-troubled debt personal banking loans and are evaluated collectively based on loan type, delinquency, historical experience and current economic factors. If a troubled debt restructuring defaults and is already on non-accrual status, the allowance for loan losses continues to be based on individual evaluation, using discounted expected cash flows or the fair value of collateral. If an accruing troubled debt restructuring defaults, the loan's risk rating is downgraded to non-accrual status and the loan's related allowance for loan losses is determined based on individual evaluation, or if necessary, the loan is charged off and collection efforts begun. The Company had commitments of $1.6 million at September 30, 2015 to lend additional funds to borrowers with restructured loans. Loans held for sale Beginning January 1, 2015, certain long-term fixed rate personal real estate loan originations have been designated as held for sale, and the Company has elected the fair value option for these loans. The election of the fair value option aligns the accounting for these loans with the related economic hedges discussed in Note 10. At September 30, 2015 , the fair value of these loans was $2.2 million , and the unpaid principal balance was $2.1 million . The unrealized gain in fair value was recognized in loan fees and sales in the consolidated statement of income. None of these loans were on non-accrual status or past due. Interest income with respect to loans held for sale is accrued based on the principal amount outstanding and the loan's contractual interest rate. Beginning in the third quarter of 2015, the Company has designated certain student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans at various times while the student is attending school or shortly after graduation. At September 30, 2015 , the balance of these loans was $2.0 million . These loans are carried at lower of cost or fair value, and none were on non-accrual status or past due. Foreclosed real estate/repossessed assets The Company’s holdings of foreclosed real estate totaled $3.1 million and $5.5 million at September 30, 2015 and December 31, 2014 , respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $3.1 million and $2.4 million at September 30, 2015 and December 31, 2014 , respectively. These assets are carried at the lower of the amount recorded at acquisition date or the current fair value less estimated costs to sell.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2015
Investment Securities [Abstract]
Investment Securities	Investment Securities Investment securities, at fair value, consisted of the following at September 30, 2015 and December 31, 2014 . (In thousands) Sept. 30, 2015 Dec. 31, 2014 Available for sale $ 9,472,959 $ 9,523,560 Trading 14,463 15,357 Non-marketable 116,634 106,875 Total investment securities $ 9,604,056 $ 9,645,792 Most of the Company’s investment securities are classified as available for sale, and this portfolio is discussed in more detail below. Securities which are classified as non-marketable include Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank stock held for debt and regulatory purposes, which totaled $46.8 million at September 30, 2015 and $46.6 million at December 31, 2014 . Investment in Federal Reserve Bank 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. Non-marketable securities also include private equity investments, which amounted to $69.5 million at September 30, 2015 and $60.2 million at December 31, 2014 . A summary of the available for sale investment securities by maturity groupings as of September 30, 2015 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. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral. (In thousands) Amortized Cost Fair Value U.S. government and federal agency obligations: Within 1 year $ 59,884 $ 60,116 After 1 but within 5 years 163,996 167,780 After 5 but within 10 years 143,940 144,161 After 10 years 52,882 48,342 Total U.S. government and federal agency obligations 420,702 420,399 Government-sponsored enterprise obligations: Within 1 year 42,108 42,249 After 1 but within 5 years 477,115 482,232 After 5 but within 10 years 332,296 332,248 After 10 years 5,630 5,480 Total government-sponsored enterprise obligations 857,149 862,209 State and municipal obligations: Within 1 year 99,618 99,985 After 1 but within 5 years 667,923 685,757 After 5 but within 10 years 912,614 924,070 After 10 years 140,081 137,347 Total state and municipal obligations 1,820,236 1,847,159 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,508,870 2,575,835 Non-agency mortgage-backed securities 805,560 817,197 Asset-backed securities 2,585,088 2,584,688 Total mortgage and asset-backed securities 5,899,518 5,977,720 Other debt securities: Within 1 year 3,999 4,048 After 1 but within 5 years 83,398 83,613 After 5 but within 10 years 229,071 226,599 After 10 years 12,000 11,748 Total other debt securities 328,468 326,008 Equity securities 5,677 39,464 Total available for sale investment securities $ 9,331,750 $ 9,472,959 Investments in U.S. government and federal agency obligations are comprised mainly of U.S. Treasury inflation-protected securities, which totaled $420.3 million , at fair value, at September 30, 2015 . 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 $93.2 million , at fair value, of auction rate securities, which were previously purchased from bank customers. Included in equity securities is common and preferred stock held by the holding company, Commerce Bancshares, Inc. (the Parent), with a fair value of $39.4 million at September 30, 2015 . For securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type. (In thousands) Amortized Cost Gross Gross Fair Value September 30, 2015 U.S. government and federal agency obligations $ 420,702 $ 5,930 $ (6,233 ) $ 420,399 Government-sponsored enterprise obligations 857,149 7,809 (2,749 ) 862,209 State and municipal obligations 1,820,236 33,416 (6,493 ) 1,847,159 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,508,870 69,477 (2,512 ) 2,575,835 Non-agency mortgage-backed securities 805,560 12,285 (648 ) 817,197 Asset-backed securities 2,585,088 7,444 (7,844 ) 2,584,688 Total mortgage and asset-backed securities 5,899,518 89,206 (11,004 ) 5,977,720 Other debt securities 328,468 979 (3,439 ) 326,008 Equity securities 5,677 33,787 — 39,464 Total $ 9,331,750 $ 171,127 $ (29,918 ) $ 9,472,959 December 31, 2014 U.S. government and federal agency obligations $ 497,336 $ 9,095 $ (5,024 ) $ 501,407 Government-sponsored enterprise obligations 968,574 2,593 (8,040 ) 963,127 State and municipal obligations 1,789,215 32,340 (8,354 ) 1,813,201 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,523,377 75,923 (5,592 ) 2,593,708 Non-agency mortgage-backed securities 372,911 11,061 (1,228 ) 382,744 Asset-backed securities 3,090,174 6,922 (5,103 ) 3,091,993 Total mortgage and asset-backed securities 5,986,462 93,906 (11,923 ) 6,068,445 Other debt securities 140,784 420 (2,043 ) 139,161 Equity securities 3,931 34,288 — 38,219 Total $ 9,386,302 $ 172,642 $ (35,384 ) $ 9,523,560 The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis and analysis is placed on securities whose credit rating has fallen below A3 (Moody's) or A- (Standard & Poor's), whose fair values have fallen more than 20% below purchase price for an extended period of time, or have been identified based on management’s judgment. These securities are placed on a watch list, and for all such securities, detailed cash flow models are prepared which use inputs specific to each security. Inputs to these models include factors such as cash flow received, contractual payments required, and various other information related to the underlying collateral (including current delinquencies), collateral loss severity rates (including loan to values), expected delinquency rates, credit support from other tranches, and prepayment speeds. Stress tests are performed at varying levels of delinquency rates, prepayment speeds and loss severities in order to gauge probable ranges of credit loss. At September 30, 2015 , the fair value of securities on this watch list was $102.8 million compared to $123.9 million at December 31, 2014 . As of September 30, 2015 , 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 $47.4 million . The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $14.1 million . The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost. The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities at September 30, 2015 included the following: Significant Inputs Range Prepayment CPR 1% - 25% Projected cumulative default 17% - 54% Credit support 0% - 22% Loss severity 20% - 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 Nine Months Ended September 30 (In thousands) 2015 2014 Cumulative OTTI credit losses at January 1 $ 13,734 $ 12,499 Credit losses on debt securities for which impairment was not previously recognized 76 — Credit losses on debt securities for which impairment was previously recognized 407 1,348 Increase in expected cash flows that are recognized over remaining life of security (73 ) (97 ) Cumulative OTTI credit losses at September 30 $ 14,144 $ 13,750 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 September 30, 2015 U.S. government and federal agency obligations $ 158,390 $ 1,701 $ 31,479 $ 4,532 $ 189,869 $ 6,233 Government-sponsored enterprise obligations 11,419 57 110,123 2,692 121,542 2,749 State and municipal obligations 120,098 703 110,550 5,790 230,648 6,493 Mortgage and asset-backed securities: Agency mortgage-backed securities 64,863 259 305,767 2,253 370,630 2,512 Non-agency mortgage-backed securities 199,875 361 53,765 287 253,640 648 Asset-backed securities 998,031 5,542 152,502 2,302 1,150,533 7,844 Total mortgage and asset-backed securities 1,262,769 6,162 512,034 4,842 1,774,803 11,004 Other debt securities 179,566 2,490 25,565 949 205,131 3,439 Total $ 1,732,242 $ 11,113 $ 789,751 $ 18,805 $ 2,521,993 $ 29,918 December 31, 2014 U.S. government and federal agency obligations $ 90,261 $ 818 $ 32,077 $ 4,206 $ 122,338 $ 5,024 Government-sponsored enterprise obligations 224,808 922 224,779 7,118 449,587 8,040 State and municipal obligations 172,980 646 215,702 7,708 388,682 8,354 Mortgage and asset-backed securities: Agency mortgage-backed securities 55,128 429 381,617 5,163 436,745 5,592 Non-agency mortgage-backed securities 141,655 609 43,659 619 185,314 1,228 Asset-backed securities 1,424,457 2,009 159,098 3,094 1,583,555 5,103 Total mortgage and asset-backed securities 1,621,240 3,047 584,374 8,876 2,205,614 11,923 Other debt securities 16,434 55 80,203 1,988 96,637 2,043 Total $ 2,125,723 $ 5,488 $ 1,137,135 $ 29,896 $ 3,262,858 $ 35,384 The total available for sale portfolio consisted of approximately 2,000 individual securities at September 30, 2015 . The portfolio included 332 securities, having an aggregate fair value of $2.5 billion , that were in an unrealized loss position at September 30, 2015 , compared to 363 securities, with a fair value of $3.3 billion , at December 31, 2014 . The total amount of unrealized losses on these securities decreased $5.5 million to $29.9 million at September 30, 2015 . At September 30, 2015 , the fair value of securities in an unrealized loss position for 12 months or longer totaled $789.8 million , or 8.3% of the total portfolio value, and did not include any securities identified as other-than-temporarily impaired. The Company’s holdings of state and municipal obligations included gross unrealized losses of $6.5 million at September 30, 2015 . Of these losses, $5.5 million related to auction rate securities and $1.0 million related to other state and municipal obligations. This portfolio, exclusive of auction rate securities, totaled $1.8 billion at fair value, or 18.5% of total available for sale securities. The average credit quality of the portfolio, excluding auction rate securities, is Aa2 as rated by Moody’s. The portfolio is diversified in order to reduce risk, and information about the top five largest holdings, by state and economic sector, is shown in the table below. The Company has processes and procedures in place to monitor its holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner. % of Portfolio Average Life (in years) Average Rating (Moody’s) At September 30, 2015 Texas 12.1 % 6.1 Aa2 Florida 7.0 4.5 Aa3 New York 6.9 6.8 Aa2 Ohio 6.7 6.1 Aa2 Washington 5.4 5.7 Aa2 General obligation 37.7 % 5.6 Aa2 Lease 18.9 5.5 Aa2 Transportation 12.9 4.7 A1 Housing 12.9 6.4 Aa1 Limited tax 8.9 6.5 Aa2 The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Nine Months Ended September 30 (In thousands) 2015 2014 Proceeds from sales of available for sale securities $ 675,870 $ 30,998 Proceeds from sales of non-marketable securities 9,023 33,043 Total proceeds $ 684,893 $ 64,041 Available for sale: Gains realized on sales $ 2,813 $ — Losses realized on sales — (5,197 ) Gain realized on donation — 1,570 Other-than-temporary impairment recognized on debt securities (483 ) (1,348 ) Non-marketable: Gains realized on sales 2,516 1,613 Losses realized on sales — (134 ) Fair value adjustments, net 2,954 13,970 Investment securities gains, net $ 7,800 $ 10,474 At September 30, 2015 , securities totaling $4.3 billion in fair value were pledged to secure public fund deposits, securities sold under agreements to repurchase, trust funds, and borrowings at the Federal Reserve Bank and FHLB. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $364.1 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	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets	Goodwill and Other Intangible Assets The following table presents information about the Company's intangible assets which have estimable useful lives. September 30, 2015 December 31, 2014 (In thousands) Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Amortizable intangible assets: Core deposit premium $ 31,270 $ (25,905 ) $ — $ 5,365 $ 31,270 $ (24,698 ) $ — $ 6,572 Mortgage servicing rights 4,400 (2,901 ) (38 ) 1,461 3,693 (2,718 ) (97 ) 878 Total $ 35,670 $ (28,806 ) $ (38 ) $ 6,826 $ 34,963 $ (27,416 ) $ (97 ) $ 7,450 Aggregate amortization expense on intangible assets was $445 thousand and $499 thousand for the three month periods ended September 30, 2015 and 2014 , respectively, and $1.4 million and $1.6 million for the nine month periods ended September 30, 2015 and 2014 , respectively. The following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of September 30, 2015 . The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. (In thousands) 2015 $ 1,753 2016 1,374 2017 1,033 2018 786 2019 649 Changes in the carrying amount of goodwill and net other intangible assets for the nine month period ended September 30, 2015 is as follows. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance January 1, 2015 $ 138,921 $ 6,572 $ 878 Originations — — 707 Amortization — (1,207 ) (183 ) Impairment reversal — — 59 Balance September 30, 2015 $ 138,921 $ 5,365 $ 1,461 Goodwill allocated to the Company’s operating segments at September 30, 2015 and December 31, 2014 is shown below. (In thousands) Consumer segment $ 70,721 Commercial segment 67,454 Wealth segment 746 Total goodwill $ 138,921

Guarantees

Guarantees	9 Months Ended
	Sep. 30, 2015
Guarantees [Abstract]
Guarantees	Guarantees The Company, as a provider of financial services, routinely issues financial guarantees in the form of financial and performance standby letters of credit. Standby letters of credit are contingent commitments issued by the Company generally to guarantee the payment or performance obligation of a customer to a third party. While these represent a potential outlay by the Company, a significant amount of the commitments may expire without being drawn upon. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit. The letters of credit are subject to the same credit policies, underwriting standards and approval process as loans made by the Company. Most of the standby letters of credit are secured, and in the event of nonperformance by customers, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities. Upon issuance of standby letters of credit, the Company recognizes a liability for the fair value of the obligation undertaken, which is estimated to be equivalent to the amount of fees received from the customer over the life of the agreement. At September 30, 2015 , that net liability was $2.6 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 $335.0 million at September 30, 2015 . The Company periodically enters into risk participation agreements (RPAs) as a guarantor to other financial institutions, in order to mitigate those institutions’ credit risk associated with interest rate swaps with third parties. The RPA stipulates that, in the event of default by the third party on the interest rate swap, the Company will reimburse a portion of the loss borne by the financial institution. These interest rate swaps are normally collateralized (generally with real property, inventories and equipment) by the third party, which limits the credit risk associated with the Company’s RPAs. The third parties usually have other borrowing relationships with the Company. The Company monitors overall borrower collateral and at September 30, 2015 , believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 3 to 11 years. At September 30, 2015 , the fair value of the Company's guarantee liabilities for RPAs was $234 thousand , and the notional amount of the underlying swaps was $66.8 million . The maximum potential future payment guaranteed by the Company cannot be readily estimated but is dependent upon the fair value of the interest rate swaps at the time of default.

Pension

Pension	9 Months Ended
	Sep. 30, 2015
Pension [Abstract]
Pension	Pension The amount of net pension cost is shown in the table below: For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) 2015 2014 2015 2014 Service cost - benefits earned during the period $ 127 $ 133 $ 379 $ 399 Interest cost on projected benefit obligation 1,139 1,262 3,571 3,785 Expected return on plan assets (1,523 ) (1,561 ) (4,569 ) (4,683 ) Amortization of prior service cost (203 ) — (203 ) — Amortization of unrecognized net loss 660 359 1,969 1,079 Net periodic pension cost $ 200 $ 193 $ 1,147 $ 580 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 nine months of 2015 , 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 2015 .

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2015
Common Stock [Abstract]
Common Stock	Common and Preferred 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 September 30 For the Nine Months Ended September 30 (In thousands, except per share data) 2015 2014 2015 2014 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 64,612 $ 68,185 $ 200,020 $ 199,029 Less preferred stock dividends 2,250 1,800 6,750 1,800 Net income available to common shareholders 62,362 66,385 193,270 197,229 Less income allocated to nonvested restricted stock 884 879 2,677 2,537 Net income allocated to common stock $ 61,478 $ 65,506 $ 190,593 $ 194,692 Weighted average common shares outstanding 91,989 95,104 93,874 97,591 Basic income per common share $ .67 $ .69 $ 2.03 $ 2.00 Diluted income per common share: Net income available to common shareholders $ 62,362 $ 66,385 $ 193,270 $ 197,229 Less income allocated to nonvested restricted stock 883 877 2,672 2,530 Net income allocated to common stock $ 61,479 $ 65,508 $ 190,598 $ 194,699 Weighted average common shares outstanding 91,989 95,104 93,874 97,591 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 280 412 300 419 Weighted average diluted common shares outstanding 92,269 95,516 94,174 98,010 Diluted income per common share $ .66 $ .69 $ 2.02 $ 1.99 Unexercised stock options and stock appreciation rights of 377 thousand and 152 thousand were excluded in the computation of diluted income per common share for the nine month periods ended September 30, 2015 and 2014 , respectively, because their inclusion would have been anti-dilutive. On June 19, 2014, t he Company issued and sold 6,000,000 depositary shares, representing 6,000 shares of 6.00% Series B Non-Cumulative Perpetual Preferred Stock, par value $1.00 per share, having an aggregate liquidation preference of $150.0 million (“Series B Preferred Stock”). Each depositary share has a liquidation preference of $25.00 per share. Dividends on the Series B Preferred Stock, if declared, accrue and are payable quarterly, in arrears, at a rate of 6.00%. The Series B Preferred Stock qualifies as Tier 1 capital for the purposes of the regulatory capital calculations. In the event that the Company does not declare and pay dividends on the Series B Preferred Stock for the most recent dividend period, the ability of the Company to declare or pay dividends on, purchase, redeem or otherwise acquire shares of its common stock or any securities of the Company that rank junior to the Series B Preferred Stock is subject to certain restrictions under the terms of the Series B Preferred Stock. The net proceeds from the issuance and sale of the Series B Preferred Stock, totaling $ 144.8 million , were used to fund an accelerated share repurchase (ASR) program. Under this ASR agreement, the Company paid $200.0 million to Morgan Stanley & Co. LLC (Morgan Stanley) and received from Morgan Stanley 3,208,206 shares of the Company’s common stock in June 2014. Final settlement occurred in June 2015, at which time the remaining shares, totaling 1,480,378 , were received by the Company. The specific number of shares that the Company ultimately repurchased was based on the volume-weighted-average price per share of the Company's common stock during the repurchase period. The Company entered into a second ASR agreement in May 2015, under which it paid $100.0 million to Morgan Stanley and received from Morgan Stanley 1,803,427 shares of common stock at that time. Final settlement occurred in August 2015, at which time the remaining shares, totaling 351,620 , were received by the Company. * All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2014.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. The other component is 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 (2) Total Accumulated Other Comprehensive Income (In thousands) OTTI Other Balance January 1, 2015 $ 3,791 $ 81,310 $ (23,008 ) $ 62,093 Other comprehensive income (loss) before reclassifications (976 ) 7,255 — 6,279 Amounts reclassified from accumulated other comprehensive income 483 (2,813 ) 1,766 (564 ) Current period other comprehensive income (loss), before tax (493 ) 4,442 1,766 5,715 Income tax (expense) benefit 187 (1,688 ) (671 ) (2,172 ) Current period other comprehensive income (loss), net of tax (306 ) 2,754 1,095 3,543 Transfer of unrealized gain on securities for which impairment was not previously recognized 43 (43 ) — — Balance September 30, 2015 $ 3,528 $ 84,021 $ (21,913 ) $ 65,636 Balance January 1, 2014 $ 4,203 $ 21,303 $ (15,775 ) $ 9,731 Other comprehensive income (loss) before reclassifications (1,568 ) 76,965 — 75,397 Amounts reclassified from accumulated other comprehensive income 1,348 3,627 1,079 6,054 Current period other comprehensive income (loss), before tax (220 ) 80,592 1,079 81,451 Income tax (expense) benefit 84 (30,625 ) (410 ) (30,951 ) Current period other comprehensive income (loss), net of tax (136 ) 49,967 669 50,500 Balance September 30, 2014 $ 4,067 $ 71,270 $ (15,106 ) $ 60,231 (1) The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income. (2) The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of unrecognized net loss" (see Note 6), for inclusion in the consolidated statements of income.

Segments

Segments	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segments	Segments The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial and Wealth. The Consumer segment includes the consumer portion of the retail branch network (loans, deposits, and other personal banking services), indirect and other consumer financing, and consumer debit and credit bank cards. The Commercial segment provides corporate lending (including the Small Business Banking product line within the branch network), leasing, international services, and business, government deposit, and related commercial cash management services, as well as merchant and commercial bank card products. The Commercial segment includes the Capital Markets Group, which sells fixed income securities and provides investment safekeeping and bond accounting services. The Wealth segment provides traditional trust and estate tax planning, advisory and discretionary investment management, and brokerage services, and includes the Private Banking product portfolio. Effective January 1, 2015, certain personal real estate loans, which are held for investment and totaled approximately $340 million , were removed from the Consumer segment. These loans were transferred to the "Other/Elimination" category, outside of segment totals. Management's performance evaluation of the residential mortgage business within the Consumer segment is based on originations and sales of mortgages and the related fees. Information for prior periods presented below have been revised to reflect the transfer of the held for investment loans and their related income and expense, in order to provide comparable data. The 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. (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Three Months Ended September 30, 2015 Net interest income $ 67,083 $ 74,008 $ 10,391 $ 151,482 $ 10,556 $ 162,038 Provision for loan losses (8,605 ) 166 106 (8,333 ) (31 ) (8,364 ) Non-interest income 30,809 47,485 34,042 112,336 (1,188 ) 111,148 Investment securities losses, net — — — — (378 ) (378 ) Non-interest expense (69,196 ) (68,710 ) (27,211 ) (165,117 ) (6,145 ) (171,262 ) Income before income taxes $ 20,091 $ 52,949 $ 17,328 $ 90,368 $ 2,814 $ 93,182 Nine Months Ended September 30, 2015 Net interest income $ 199,265 $ 218,386 $ 31,921 $ 449,572 $ 22,261 $ 471,833 Provision for loan losses (25,500 ) 842 114 (24,544 ) 5,003 (19,541 ) Non-interest income 87,409 144,684 102,336 334,429 (2,763 ) 331,666 Investment securities gains, net — — — — 7,800 7,800 Non-interest expense (203,446 ) (199,027 ) (81,498 ) (483,971 ) (16,308 ) (500,279 ) Income before income taxes $ 57,728 $ 164,885 $ 52,873 $ 275,486 $ 15,993 $ 291,479 Three Months Ended September 30, 2014 Net interest income $ 66,565 $ 72,019 $ 9,811 $ 148,395 $ 6,321 $ 154,716 Provision for loan losses (8,306 ) 863 (29 ) (7,472 ) (180 ) (7,652 ) Non-interest income 29,699 47,689 33,368 110,756 1,530 112,286 Investment securities losses, net — — — — 2,995 2,995 Non-interest expense (65,900 ) (63,542 ) (23,833 ) (153,275 ) (8,565 ) (161,840 ) Income before income taxes $ 22,058 $ 57,029 $ 19,317 $ 98,404 $ 2,101 $ 100,505 Nine Months Ended September 30, 2014 Net interest income $ 198,533 $ 214,406 $ 29,713 $ 442,652 $ 25,623 $ 468,275 Provision for loan losses (25,816 ) 803 463 (24,550 ) (317 ) (24,867 ) Non-interest income 84,331 142,326 94,870 321,527 2,149 323,676 Investment securities gains, net — — — — 10,474 10,474 Non-interest expense (197,220 ) (188,223 ) (72,606 ) (458,049 ) (28,306 ) (486,355 ) Income before income taxes $ 59,828 $ 169,312 $ 52,440 $ 281,580 $ 9,623 $ 291,203 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 policies, which have been developed to reflect the underlying economics of the businesses. The policies address the methodologies 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	9 Months Ended
	Sep. 30, 2015
Derivative Instrument Detail [Abstract]
Derivative Instruments	Derivative Instruments The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. The Company’s derivative instruments are accounted for as free-standing derivatives, and changes in their fair value are recorded in current earnings. (In thousands) September 30, 2015 December 31, 2014 Interest rate swaps $ 906,559 $ 647,709 Interest rate caps 41,603 53,587 Credit risk participation agreements 70,736 75,943 Foreign exchange contracts 17,751 19,791 Mortgage loan commitments 12,473 — Mortgage loan forward sale contracts 1,280 — Forward TBA contracts 12,000 — Total notional amount $ 1,062,402 $ 797,030 The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. These swaps are offset by matching contracts purchased by the Company from other financial dealer institutions. Contracts with dealers that require central clearing are novated to a clearing agency who becomes the Company's counterparty. Because of the matching terms of the offsetting contracts, in addition to collateral provisions which mitigate the impact of non-performance risk, changes in fair value subsequent to initial recognition have a minimal effect on earnings. Many of the Company’s interest rate swap 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 banking customer counterparties are engaged in a variety of businesses, including real estate and building materials, manufacturing, education, communications, retail product distribution, and retirement communities. At September 30, 2015 , the largest potential loss exposures were in the groups related to education, real estate, and distribution. If the counterparties in these groups failed to perform, and if the underlying collateral proved to be of no value, the Company estimates that it would incur losses of $ 1.5 million (education), $ 7.1 million (real estate), and $ 2.0 million (distribution) at September 30, 2015 . 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. In 2015, the Company initiated a program of secondary market sales of residential mortgage loans and has designated certain newly-originated residential mortgage loans as held for sale. Derivative instruments arising from this activity include mortgage loan commitments and forward 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 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. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets, while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. Information about the valuation methods used to determine fair value is provided in Note 13 on Fair Value Measurements. Asset Derivatives Liability Derivatives Sept. 30, 2015 Dec. 31, 2014 Sept. 30, 2015 Dec. 31, 2014 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 15,681 $ 10,144 $ (15,681 ) $ (10,166 ) Interest rate caps 16 62 (16 ) (62 ) Credit risk participation agreements 2 3 (234 ) (226 ) Foreign exchange contracts 219 248 (197 ) (494 ) Mortgage loan commitments 451 — — — Mortgage loan forward sale contracts — — (5 ) — Forward TBA contracts — — (118 ) — Total $ 16,369 $ 10,457 $ (16,251 ) $ (10,948 ) The effects of derivative instruments on the consolidated statements of income are shown in the table below. Location of Gain or (Loss) Recognized in Income on Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) 2015 2014 2015 2014 Derivative instruments: Interest rate swaps Other non-interest income $ 741 $ 212 $ 3,551 $ 1,023 Interest rate caps Other non-interest income — 13 — 13 Credit risk participation agreements Other non-interest income (57 ) (21 ) (9 ) 177 Foreign exchange contracts Other non-interest income (55 ) 176 267 134 Mortgage loan commitments Loan fees and sales 106 — 451 — Mortgage loan forward sale contracts Loan fees and sales (6 ) — (5 ) — Forward TBA contracts Loan fees and sales (370 ) — 15 — Total $ 359 $ 380 $ 4,270 $ 1,347 The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. They also provide 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 these tables 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 tables were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default. The Company is party to master netting arrangements with most of its swap derivative counterparties; however, the Company does not offset derivative assets and liabilities under these arrangements on its consolidated balance sheet. Collateral, usually in the form of marketable securities, is exchanged between the Company and dealer bank counterparties and is generally subject to thresholds and transfer minimums. By contract, it may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash and securities to its clearing agency. At September 30, 2015 , the Company had a net liability position with dealer bank and clearing agency counterparties totaling $15.7 million , and had posted securities with a fair value of $3.3 million and cash totaling $16.8 million . Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below. Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Collateral Received/Pledged Net Amount September 30, 2015 Assets: Derivatives subject to master netting agreements $ 15,700 $ — $ 15,700 $ (16 ) $ — $ 15,684 Derivatives not subject to master netting agreements 669 — 669 Total derivatives 16,369 — 16,369 Liabilities: Derivatives subject to master netting agreements $ 16,052 $ — $ 16,052 $ (16 ) $ (14,456 ) $ 1,580 Derivatives not subject to master netting agreements 199 — 199 Total derivatives 16,251 — 16,251 December 31, 2014 Assets: Derivatives subject to master netting agreements $ 10,209 $ — $ 10,209 $ (251 ) $ — $ 9,958 Derivatives not subject to master netting agreements 248 — 248 Total derivatives 10,457 — 10,457 Liabilities: Derivatives subject to master netting agreements $ 10,454 $ — $ 10,454 $ (251 ) $ (8,738 ) $ 1,465 Derivatives not subject to master netting agreements 494 — 494 Total derivatives 10,948 — 10,948

Resale and Repurchase Agreement

Resale and Repurchase Agreements (Notes)	9 Months Ended
	Sep. 30, 2015
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 balance sheet, as permitted under the netting provisions of ASC 210-20-45. The collateral swaps totaled $350.0 million at September 30, 2015 and $450.0 million at December 31, 2014 . At September 30, 2015 , the Company had posted collateral of $360.8 million in marketable securities, consisting mainly of agency mortgage-backed bonds, and had accepted $373.2 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 Securities Collateral Received/Pledged Net Amount September 30, 2015 Total resale agreements, subject to master netting arrangements $ 1,325,000 $ (350,000 ) $ 975,000 $ — $ (975,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,981,497 (350,000 ) 1,631,497 — (1,631,497 ) — December 31, 2014 Total resale agreements, subject to master netting arrangements $ 1,500,000 $ (450,000 ) $ 1,050,000 $ — $ (1,049,370 ) $ 630 Total repurchase agreements, subject to master netting arrangements 2,308,678 (450,000 ) 1,858,678 — (1,858,678 ) — The table below shows the remaining contractual maturities of repurchase agreements outstanding at September 30, 2015, in addition to the various types of marketable securities that have been pledged as collateral for these borrowings. Remaining Contractual Maturity of the Agreements (In thousands) Overnight and continuous Up to 90 days Greater than 90 days Total September 30, 2015 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 151,015 $ 11,937 $ — $ 162,952 Government-sponsored enterprise obligations 361,228 3,298 17,928 382,454 Agency mortgage-backed securities 335,300 93,104 232,072 660,476 Asset-backed securities 690,615 85,000 — 775,615 Total repurchase agreements, gross amount recognized $ 1,538,158 $ 193,339 $ 250,000 $ 1,981,497

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2015
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company has historically issued stock-based compensation in the form of nonvested restricted stock, stock options and stock appreciation rights (SARs). During the first nine months of 2015 , stock-based compensation was issued in the form of nonvested restricted stock and SARs. The stock-based compensation expense that has been charged against income was $2.4 million and $2.2 million in the three month periods ended September 30, 2015 and 2014 , respectively, and $7.7 million and $6.6 million in the nine months ended September 30, 2015 and 2014 , 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 September 30, 2015 , and changes during the nine month period then ended, is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2015 1,259,689 $34.41 Granted 215,245 41.69 Vested (141,877 ) 30.11 Forfeited (15,936 ) 34.79 Nonvested at September 30, 2015 1,317,121 $36.05 SARs and stock options are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs vest ratably over 4 years of continuous service and have 10 -year contractual terms. All SARs must be settled in stock under provisions of the plan. Stock options, which have not been granted since 2005, vested ratably over 3 years of continuous service and also have 10 -year contractual terms. In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs and options 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 $7.58 Assumptions: Dividend yield 2.2 % Volatility 21.3 % Risk-free interest rate 1.8 % Expected term 7.2 years A summary of SAR activity during the first nine months of 2015 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, 2015 1,780,578 $33.96 Granted 240,267 41.40 Forfeited (6,182 ) 39.04 Expired (1,076 ) 37.31 Exercised (411,126 ) 32.94 Outstanding at September 30, 2015 1,602,461 $35.32 4.4 years $ 16,412 A summary of option activity during the first nine months of 2015 is presented below. (Dollars in thousands, except per share data) Shares Weighted Average Exercise Price Outstanding at January 1, 2015 68,675 $29.27 Granted — — Forfeited — — Expired — — Exercised (68,675 ) 29.27 Outstanding at September 30, 2015 $ — $ —

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
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 and trading securities, certain non-marketable securities relating to private equity activities, and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as mortgage servicing rights and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or fair value accounting or write-downs of individual assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. For accounting disclosure purposes, a three-level valuation hierarchy of fair value measurements has been established. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1 – inputs to the valuation methodology are quoted prices for identical assets or liabilities in active markets. • Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds). • Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company’s best information and assumptions that a market participant would consider. When determining the fair value measurements for assets and liabilities required or permitted to be recorded or disclosed at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to observable market data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets, and the Company must use alternative valuation techniques to derive an estimated fair value measurement. Instruments Measured at Fair Value on a Recurring Basis The table below presents the September 30, 2015 and December 31, 2014 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first nine months of 2015 or the year ended December 31, 2014 . Fair Value Measurements Using (In thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2015 Assets: Residential mortgage loans held for sale $ 2,173 $ — $ 2,173 $ — Available for sale securities: U.S. government and federal agency obligations 420,399 420,399 — — Government-sponsored enterprise obligations 862,209 — 862,209 — State and municipal obligations 1,847,159 — 1,753,970 93,189 Agency mortgage-backed securities 2,575,835 — 2,575,835 — Non-agency mortgage-backed securities 817,197 — 817,197 — Asset-backed securities 2,584,688 — 2,584,688 — Other debt securities 326,008 — 326,008 — Equity securities 39,464 19,509 19,955 — Trading securities 14,463 — 14,463 — Private equity investments 66,875 — — 66,875 Derivatives * 16,369 — 15,916 453 Assets held in trust 8,825 8,825 — — Total assets $ 9,581,664 $ 448,733 $ 8,972,414 $ 160,517 Liabilities: Derivatives * $ 16,251 $ — $ 16,017 $ 234 Total liabilities $ 16,251 $ — $ 16,017 $ 234 December 31, 2014 Assets: Available for sale securities: U.S. government and federal agency obligations $ 501,407 $ 501,407 $ — $ — Government-sponsored enterprise obligations 963,127 — 963,127 — State and municipal obligations 1,813,201 — 1,718,058 95,143 Agency mortgage-backed securities 2,593,708 — 2,593,708 — Non-agency mortgage-backed securities 382,744 — 382,744 — Asset-backed securities 3,091,993 — 3,091,993 — Other debt securities 139,161 — 139,161 — Equity securities 38,219 17,975 20,244 — Trading securities 15,357 — 15,357 — Private equity investments 57,581 — — 57,581 Derivatives * 10,457 — 10,454 3 Assets held in trust 8,848 8,848 — — Total assets $ 9,615,803 $ 528,230 $ 8,934,846 $ 152,727 Liabilities: Derivatives * $ 10,948 $ — $ 10,722 $ 226 Total liabilities $ 10,948 $ — $ 10,722 $ 226 * The fair value of each class of derivative is shown in Note 10. Valuation methods for instruments measured at fair value on a recurring basis Following is a description of the Company’s valuation methodologies used for instruments measured at fair value on a recurring basis. Residential mortgage loans held for sale The Company originates fixed rate, first lien residential mortgage loans that are intended for sale in the secondary market. Fair value is based on quoted secondary market prices for loans with similar characteristics, which are adjusted to include the embedded servicing value in the loans. This adjustment represents an unobservable input to the valuation but is not considered significant given the relative insensitivity of the valuation to changes in this input. Accordingly, these loan measurements are classified as Level 2. Available for sale investment securities For available for sale securities, changes in fair value, including that portion of other-than-temporary impairment unrelated to credit loss, are recorded in other comprehensive income. As mentioned in Note 3 on Investment Securities, the Company records the credit-related portion of other-than-temporary impairment in current earnings. This portfolio comprises the majority of the assets which the Company records at fair value. Most of the portfolio, which includes government-sponsored enterprise, mortgage-backed and asset-backed securities, are priced utilizing industry-standard models that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace. These measurements are classified as Level 2 in the fair value hierarchy. Where quoted prices are available in an active market, the measurements are classified as Level 1. Most of the Level 1 measurements apply to common stock and U.S. Treasury obligations. The fair values of Level 1 and 2 securities (excluding equity securities) in the available for sale portfolio are prices provided by a third-party pricing service. The prices provided by the third-party pricing service are based on observable market inputs, as described in the sections below. On a quarterly basis, the Company compares a sample of these prices to other independent sources for the same and similar securities. Variances are analyzed, and, if appropriate, additional research is conducted with the third-party pricing service. Based on this research, the pricing service may affirm or revise its quoted price. No significant adjustments have been made to the prices provided by the pricing service. The pricing service also provides documentation on an ongoing basis that includes reference data, inputs and methodology by asset class, which is reviewed to ensure that security placement within the fair value hierarchy is appropriate. Valuation methods and inputs, by class of security: • U.S. government and federal agency obligations U.S. treasury bills, bonds and notes, including inflation-protected securities, are valued using live data from active market makers and inter-dealer brokers. Valuations for stripped coupon and principal issues are derived from yield curves generated from various dealer contacts and live data sources. • Government-sponsored enterprise obligations Government-sponsored enterprise obligations are evaluated using cash flow valuation models. Inputs used are live market data, cash settlements, Treasury market yields, and floating rate indices such as LIBOR, CMT, and Prime. • State and municipal obligations, excluding auction rate securities A yield curve is generated and applied to bond sectors, and individual bond valuations are extrapolated. Inputs used to generate the yield curve are bellwether issue levels, established trading spreads between similar issuers or credits, historical trading spreads over widely accepted market benchmarks, new issue scales, and verified bid information. Bid information is verified by corroborating the data against external sources such as broker-dealers, trustees/paying agents, issuers, or non-affiliated bondholders. • Mortgage and asset-backed securities Collateralized mortgage obligations and other asset-backed securities are valued at the tranche level. For each tranche valuation, the process generates predicted cash flows for the tranche, applies a market based (or benchmark) yield/spread for each tranche, and incorporates deal collateral performance and tranche level attributes to determine tranche-specific spreads to adjust the benchmark yield. Tranche cash flows are generated from new deal files and prepayment/default assumptions. Tranche spreads are based on tranche characteristics such as average life, type, volatility, ratings, underlying collateral and performance, and prevailing market conditions. The appropriate tranche spread is applied to the corresponding benchmark, and the resulting value is used to discount the cash flows to generate an evaluated price. Valuation of agency pass-through securities, typically issued under GNMA, FNMA, FHLMC, and SBA programs, are primarily derived from information from the To Be Announced (TBA) market. This market consists of generic mortgage pools which have not been received for settlement. Snapshots of the TBA market, using live data feeds distributed by multiple electronic platforms, and in conjunction with other indices, are used to compute a price based on discounted cash flow models. • Other debt securities Other debt securities are valued using active markets and inter-dealer brokers as well as bullet spread scales and option adjusted spreads. The spreads and models use yield curves, terms and conditions of the bonds, and any special features (i.e., call or put options, redemption features, etc.). • Equity securities Equity securities are priced using the market prices for each security from the major stock exchanges or other electronic quotation systems. These are generally classified as Level 1 measurements. Stocks which trade infrequently are classified as Level 2. The available for sale portfolio includes certain auction rate securities. The auction process by which auction rate securities are normally priced has not functioned in recent years, and due to the illiquidity in the market, the fair value of these securities cannot be based on observable market prices. The fair values of the auction rate securities are estimated using a discounted cash flows analysis which is discussed more fully in the Level 3 Inputs section of this note. Because several of the inputs significant to the measurement are not observable, these measurements are classified as Level 3 measurements. Trading securities The securities in the Company’s trading portfolio are priced by averaging several broker quotes for similar instruments and are classified as Level 2 measurements. Private equity investments These securities are held by the Company’s private equity subsidiaries and are included in non-marketable investment securities in the consolidated balance sheets. Due to the absence of quoted market prices, valuation of these nonpublic investments requires significant management judgment. These fair value measurements, which are discussed in the Level 3 Inputs section of this note, are classified as Level 3. Derivatives The Company’s derivative instruments include interest rate swaps, foreign exchange forward contracts, certain credit risk guarantee agreements, and various instruments related to residential loan sale activity. When appropriate, the impact of credit standing, as well as any potential credit enhancements such as collateral, has been considered in the fair value measurement. • Valuations for interest rate swaps are derived from a proprietary model whose significant inputs are readily observable market parameters, primarily yield curves used to calculate current exposure. Counterparty credit risk is incorporated into the model and calculated by applying a net credit spread over LIBOR to the swap's total expected exposure over time. The net credit spread is comprised of spreads for both the Company and its counterparty, derived from probability of default and other loss estimate information obtained from a third party credit data provider or from the Company's Credit Department when not otherwise available. The credit risk component is not significant compared to the overall fair value of the swaps. The results of the model are constantly validated through comparison to active trading in the marketplace. These fair value measurements are classified as Level 2. • Fair value measurements for foreign exchange contracts are derived from a model whose primary inputs are quotations from global market makers and are classified as Level 2. • The Company’s contracts related to credit risk guarantees are valued under a proprietary model which uses unobservable inputs and assumptions about the creditworthiness of the counterparty (generally a Bank customer). Customer credit spreads, which are based on probability of default and other loss estimates, are calculated internally by the Company's Credit Department, as mentioned above, and are based on the Company's internal risk rating for each customer. Because these inputs are significant to the measurements, they are classified as Level 3. • Derivatives relating to residential mortgage loan sale activity include commitments to originate mortgage loans held for sale, forward loan sale contracts, and forward commitments to sell TBA securities. The fair values of loan commitments and sale contracts are estimated using quoted market prices for loans similar to the underlying loans in these instruments. The valuations of loan commitments are further adjusted to include embedded servicing value and the probability of funding. These assumptions are considered Level 3 inputs and are significant to the loan commitment valuation; accordingly, the measurement of loan commitments is classified as Level 3. The fair value measurement of TBA contracts is based on security prices published on trading platforms and is classified as Level 2. Assets held in trust Assets held in an outside trust for the Company’s deferred compensation plan consist of investments in mutual funds. The fair value measurements are based on quoted prices in active markets and classified as Level 1. The Company has recorded an asset representing the total investment amount. The Company has also recorded a corresponding nonfinancial liability, representing the Company’s liability to the plan participants. The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (In thousands) State and Municipal Obligations Private Equity Investments Derivatives Total For the three months ended September 30, 2015 Balance June 30, 2015 $ 92,940 $ 58,726 $ 170 $ 151,836 Total gains or losses (realized/unrealized): Included in earnings — (1,221 ) 49 (1,172 ) Included in other comprehensive income * 227 — — 227 Discount accretion 22 — — 22 Purchases of private equity investments — 9,370 — 9,370 Balance September 30, 2015 $ 93,189 $ 66,875 $ 219 $ 160,283 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 $ — $ (1,221 ) $ 394 $ (827 ) For the nine months ended September 30, 2015 Balance January 1, 2015 $ 95,143 $ 57,581 $ (223 ) $ 152,501 Total gains or losses (realized/unrealized): Included in earnings — 2,954 442 3,396 Included in other comprehensive income * (127 ) — — (127 ) Investment securities called (2,000 ) — — (2,000 ) Discount accretion 173 — — 173 Purchases of private equity investments — 11,023 — 11,023 Sale/pay down of private equity investments — (4,800 ) — (4,800 ) Capitalized interest/dividends — 117 — 117 Balance September 30, 2015 $ 93,189 $ 66,875 $ 219 $ 160,283 Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 $ — $ 2,954 $ 442 $ 3,396 For the three months ended September 30, 2014 Balance June 30, 2014 $ 132,108 $ 44,192 $ (188 ) $ 176,112 Total gains or losses (realized/unrealized): Included in earnings — 3,225 (21 ) 3,204 Included in other comprehensive income * (921 ) — — (921 ) Discount accretion 40 — — 40 Purchases of private equity investments — 4,575 — 4,575 Capitalized interest/dividends — 45 — 45 Purchase of risk participation agreement — — 41 41 Balance September 30, 2014 $ 131,227 $ 52,037 $ (168 ) $ 183,096 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ 3,225 $ (21 ) $ 3,204 For the nine months ended September 30, 2014 Balance January 1, 2014 $ 127,724 $ 56,612 $ (65 ) $ 184,271 Total gains or losses (realized/unrealized): Included in earnings — 15,161 177 15,338 Included in other comprehensive income * 3,383 — — 3,383 Discount accretion 120 — — 120 Purchases of private equity investments — 11,575 — 11,575 Sale/pay down of private equity investments — (31,423 ) — (31,423 ) Capitalized interest/dividends — 112 — 112 Purchase of risk participation agreement — — 41 41 Sale of risk participation agreement — — (321 ) (321 ) Balance September 30, 2014 $ 131,227 $ 52,037 $ (168 ) $ 183,096 Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ (3,232 ) $ 173 $ (3,059 ) * Included in "net unrealized gains (losses) on other securities" in the consolidated statements of comprehensive income. Gains and losses included in earnings for the Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income: (In thousands) Loan Fees and Sales Other Non-Interest Income Investment Securities Gains (Losses), Net Total For the three months ended September 30, 2015 Total gains or losses included in earnings $ 106 $ (57 ) $ (1,221 ) $ (1,172 ) Change in unrealized gains or losses relating to assets still held at September 30, 2015 $ 451 $ (57 ) $ (1,221 ) $ (827 ) For the nine months ended September 30, 2015 Total gains or losses included in earnings $ 451 $ (9 ) $ 2,954 $ 3,396 Change in unrealized gains or losses relating to assets still held at September 30, 2015 $ 451 $ (9 ) $ 2,954 $ 3,396 For the three months ended September 30, 2014 Total gains or losses included in earnings $ — $ (21 ) $ 3,225 $ 3,204 Change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ (21 ) $ 3,225 $ 3,204 For the nine months ended September 30, 2014 Total gains or losses included in earnings $ — $ 177 $ 15,161 $ 15,338 Change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ 173 $ (3,232 ) $ (3,059 ) Level 3 Inputs As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $93.2 million at September 30, 2015 , while private equity investments, included in non-marketable securities, totaled $66.9 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 3 - 5 years Estimated market rate 2.3% - 7.1% Private equity investments Market comparable companies EBITDA multiple 4.0 - 5.5 Mortgage loan commitments Discounted cash flow Probability of funding 60.5% - 100.0% 82.4% Embedded servicing value .9% - 1.0% 1.0% The fair values of ARS are estimated using a discounted cash flows analysis in which estimated cash flows are based on mandatory interest rates paid under failing auctions and projected over an estimated market recovery period. Under normal conditions, ARS traded in weekly auctions and were considered liquid investments. The Company's estimate of when these auctions might resume is highly judgmental and subject to variation depending on current and projected market conditions. Few auctions of these securities are held, and most sales are privately arranged. Estimated cash flows during the period over which the Company expects to hold the securities are discounted at an estimated market rate. These securities are comprised of bonds issued by various states and municipalities for healthcare and student lending purposes, and market rates are derived for each type. Market rates are calculated at each valuation date using a LIBOR or Treasury based rate plus spreads representing adjustments for liquidity premium and nonperformance risk. The spreads are developed internally by employees in the Company's bond department. An increase in the holding period alone would result in a higher fair value measurement, while an increase in the estimated market rate (the discount rate) alone would result in a lower fair value measurement. The valuation of the ARS portfolio is reviewed on a quarterly basis by the Company's chief investment officers. The fair values of the Company's private equity investments are based on a determination of fair value of the investee company less preference payments assuming the sale of the investee company. Investee companies are normally non-public entities. The fair value of the investee company is determined by reference to the investee's total earnings before interest, depreciation/amortization, and income taxes (EBITDA) multiplied by an EBITDA factor. EBITDA is normally determined based on a trailing prior period adjusted for specific factors including current economic outlook, investee management, and specific unique circumstances such as sales order information, major customer status, regulatory changes, etc. The EBITDA multiple is based on management's review of published trading multiples for recent private equity transactions and other judgments and is derived for each individual investee. The fair value of the Company's investment (which is usually a partial interest in the investee company) is then calculated based on its ownership percentage in the investee company. On a quarterly basis, these fair value analyses are reviewed by a valuation committee consisting of investment managers and senior Company management. The significant unobservable inputs used in the fair value measurement of the Company’s derivative commitments to originate residential mortgage loans are the percentage of commitments that are actually funded and the mortgage servicing value that is inherent in the underlying loan value. A significant increase in the rate of loans that fund would result in a larger derivative asset or liability. A significant increase in the inherent mortgage servicing value would result in an increase in the derivative asset or a reduction in the derivative liability. The probability of funding and the inherent mortgage servicing values are directly impacted by changes in market rates and will generally move in the same direction as interest rates. Instruments Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis during the first nine months of 2015 and 2014 , and still held as of September 30, 2015 and 2014 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at September 30, 2015 and 2014 . Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Gains (Losses) Recognized During the Nine Months Ended September 30 September 30, 2015 Collateral dependent impaired loans $ 6,860 $ — $ — $ 6,860 $ (1,794 ) Mortgage servicing rights 1,461 — — 1,461 59 Foreclosed assets 479 — — 479 (193 ) Long-lived assets 937 — — 937 (1,366 ) September 30, 2014 Collateral dependent impaired loans $ 17,015 $ — $ — $ 17,015 $ (2,797 ) Private equity investments 1,309 — — 1,309 (1,191 ) Mortgage servicing rights 777 — — 777 13 Foreclosed assets 850 — — 850 (275 ) Long-lived assets 8,528 — — 8,528 (1,890 ) Valuation methods for instruments measured at fair value on a nonrecurring basis Following is a description of the Company’s valuation methodologies used for other financial and nonfinancial instruments measured at fair value on a nonrecurring basis. Collateral dependent impaired loans While the overall loan portfolio is not carried at fair value, the Company periodically records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral dependent loans when establishing the allowance for loan losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan. In determining the value of real estate collateral, the Company relies on external and internal appraisals of property values depending on the size and complexity of the real estate collateral. The Company maintains a staff of qualified appraisers who also review third party appraisal reports for reasonableness. In the case of non-real estate collateral, reliance is placed on a variety of sources, including external estimates of value and judgments based on the experience and expertise of internal specialists. Values of all loan collateral are regularly reviewed by credit administration. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable. These measurements are classified as Level 3. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company at September 30, 2015 and 2014 are shown in the table above. Private equity investments and restricted stock These assets are included in non-marketable investment securities in the consolidated balance sheets. They include certain investments in private equity concerns held by the Parent company which are carried at cost, reduced by other-than-temporary impairment. These investments are periodically evaluated for impairment based on their estimated fair value as determined by review of available information, most of which is provided as monthly or quarterly internal financial statements, annual audited financial statements, investee tax returns, and in certain situations, through research into and analysis of the assets and investments held by those private equity concerns. Restricted stock consists of stock issued by the Federal Reserve Bank and FHLB and is held by the bank subsidiary as required for regulatory purposes. Generally, there are restrictions on the sale and/or liquidation of these investments, and they are carried at cost, reduced by other-than-temporary impairment. Fair value measurements for these securities are classified as Level 3. Mortgage servicing rights The Company initially measures its mortgage servicing rights at fair value and amortizes them over the period of estimated net servicing income. They are periodically assessed for impairment based on fair value at the reporting date. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the fair value is estimated based on a valuation model which calculates the present value of estimated future net servicing income. The model incorporates assumptions that market participants use in estimating future net servicing income, including estimates of prepayment speeds, market discount rates, cost to service, float earnings rates, and other ancillary income, including late fees. The fair value measurements are classified as Level 3. Foreclosed assets Foreclosed assets consist of loan collateral which has been repossessed through foreclosure. This collateral is comprised of commercial and residential real estate and other non-real estate property, including auto, marine and recreational vehicles. Foreclosed assets are recorded as held for sale initially at the lower of the loan balance or fair value of the collateral less estimated selling costs. Subsequent to foreclosure, valuations are updated periodically, and the assets may be marked down further, reflecting a new cost basis. Fair value measurements may be based upon appraisals, third-party price opinions, or internally developed pricing methods. These measurements are classified as Level 3. Long-lived assets In accordance with ASC 360-10-35, investments in branch facilities and various office buildings are written down to estimated fair value, or if the property is held for sale, they are written down to estimated fair value less cost to sell. Fair value is estimated in a process which considers current local commercial real estate market conditions and the judgment of the sales agent and often involves obtaining third party appraisals from certified real estate appraisers. The carrying amounts of these real estate holdings are regularly monitored by real estate professionals employed by the Company. These fair value measurements are classified as Level 3. Unobservable inputs to these measurements, which include estimates and judgments often used in conjunction with appraisals, are not readily quantifiable. The measurements in 2015 pertained mainly to several branch facility sites which are currently being marketed for sale or re-developed.

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	9 Months Ended
	Sep. 30, 2015
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. The methods and inputs used in the estimation of fair value for the financial instruments in the table below are discussed in the preceding Fair Value Measurements note and in the Fair Value of Financial Instruments note in the Company's 2014 Annual Report on Form 10-K. There have been no significant changes in these methods and inputs since December 31, 2014 . 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: Fair Value Hierarchy Level September 30, 2015 December 31, 2014 (In thousands) Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Financial Assets Loans: Business Level 3 $ 4,406,854 $ 4,438,854 $ 3,969,952 $ 3,982,531 Real estate - construction and land Level 3 534,425 541,912 403,507 407,905 Real estate - business Level 3 2,286,013 2,327,496 2,288,215 2,315,378 Real estate - personal Level 3 1,920,650 1,968,453 1,883,092 1,933,456 Consumer Level 3 1,886,806 1,885,963 1,705,134 1,701,037 Revolving home equity Level 3 428,940 431,324 430,873 433,508 Consumer credit card Level 3 756,093 769,878 782,370 794,929 Overdrafts Level 3 4,493 4,493 6,095 6,095 Loans held for sale Level 2 4,143 4,143 — — Investment securities: Available for sale Level 1 439,908 439,908 519,382 519,382 Available for sale Level 2 8,939,862 8,939,862 8,909,035 8,909,035 Available for sale Level 3 93,189 93,189 95,143 95,143 Trading Level 2 14,463 14,463 15,357 15,357 Non-marketable Level 3 116,634 116,634 106,875 106,875 Federal funds sold Level 1 32,550 32,550 32,485 32,485 Securities purchased under agreements to resell Level 3 975,000 978,480 1,050,000 1,048,866 Interest earning deposits with banks Level 1 42,078 42,078 600,744 600,744 Cash and due from banks Level 1 384,122 384,122 467,488 467,488 Derivative instruments Level 2 15,916 15,916 10,454 10,454 Derivative instruments Level 3 453 453 3 3 Financial Liabilities Non-interest bearing deposits Level 1 $ 6,699,873 $ 6,699,873 $ 6,811,959 $ 6,811,959 Savings, interest checking and money market deposits Level 1 10,295,260 10,295,260 10,541,601 10,541,601 Time open and certificates of deposit Level 3 1,991,627 1,991,741 2,122,218 2,121,114 Federal funds purchased Level 1 561,700 561,700 3,840 3,840 Securities sold under agreements to repurchase Level 3 1,631,497 1,631,562 1,858,678 1,858,731 Other borrowings Level 3 103,831 109,939 104,058 111,102 Derivative instruments Level 2 16,017 16,017 10,722 10,722 Derivative instruments Level 3 234 234 226 226

Legal Proceedings (Notes)

Legal Proceedings (Notes)	9 Months Ended
	Sep. 30, 2015
Legal Proceedings [Abstract]
Legal Matters and Contingencies [Text Block]	Legal Proceedings On August 15, 2014, a customer filed a purported class action complaint against the Bank in the Circuit Court, Jackson County, Missouri. The case is Cassandra Warren, et al v. Commerce Bank (Case No. 1416-CV19197). In the case, the customer alleges violation of the Missouri usury statute in connection with the Bank charging overdraft fees in connection with point-of-sale/debit and automated-teller machine cards. The case seeks class-action status for Missouri customers of the Bank who may have been similarly affected. The Company believes the complaint lacks merit and will defend itself vigorously. The amount of any ultimate exposure cannot be determined with certainty at this time. The Company has various other lawsuits pending at September 30, 2015 , arising in the normal course of business. While some matters pending against the Company specify damages claimed by plaintiffs, others do not seek a specified amount of damages or are at very early stages of the legal process. The Company records a loss accrual for all legal matters for which it deems a loss is probable and can be reasonably estimated. Some legal matters, which are at early stages in the legal process, have not yet progressed to the point where a loss amount can be determined to be probable and estimable.

Loans And Allowance For Loan 24

Loans And Allowance For Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2015
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 September 30, 2015 and December 31, 2014 are as follows: (In thousands) September 30, 2015 December 31, 2014 Commercial: Business $ 4,406,854 $ 3,969,952 Real estate – construction and land 534,425 403,507 Real estate – business 2,286,013 2,288,215 Personal Banking: Real estate – personal 1,920,650 1,883,092 Consumer 1,886,806 1,705,134 Revolving home equity 428,940 430,873 Consumer credit card 756,093 782,370 Overdrafts 4,493 6,095 Total loans $ 12,224,274 $ 11,469,238
Summary Of Activity In The Allowance For Loan Losses	A summary of the activity in the allowance for loan losses during the three and nine months ended September 30, 2015 and 2014 , respectively, follows: For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Balance at beginning of period $ 86,329 $ 65,203 $ 151,532 $ 89,622 $ 66,910 $ 156,532 Provision (1,976 ) 10,340 8,364 (6,089 ) 25,630 19,541 Deductions: Loans charged off 903 11,321 12,224 3,035 34,194 37,229 Less recoveries on loans 1,167 2,693 3,860 4,119 8,569 12,688 Net loan charge-offs (recoveries) (264 ) 8,628 8,364 (1,084 ) 25,625 24,541 Balance September 30, 2015 $ 84,617 $ 66,915 $ 151,532 $ 84,617 $ 66,915 $ 151,532 Balance at beginning of period $ 98,928 $ 62,604 $ 161,532 $ 94,189 $ 67,343 $ 161,532 Provision (717 ) 8,369 7,652 3,836 21,031 24,867 Deductions: Loans charged off 686 11,414 12,100 3,034 35,917 38,951 Less recoveries on loans 1,431 3,017 4,448 3,965 10,119 14,084 Net loan charge-offs (recoveries) (745 ) 8,397 7,652 (931 ) 25,798 24,867 Balance September 30, 2014 $ 98,956 $ 62,576 $ 161,532 $ 98,956 $ 62,576 $ 161,532
Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology	The following table shows the balance in the allowance for loan losses and the related loan balance at September 30, 2015 and December 31, 2014 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under ASC 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans 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 September 30, 2015 Commercial $ 1,829 $ 32,513 $ 82,788 $ 7,194,779 Personal Banking 1,667 22,868 65,248 4,974,114 Total $ 3,496 $ 55,381 $ 148,036 $ 12,168,893 December 31, 2014 Commercial $ 4,527 $ 55,551 $ 85,095 $ 6,606,123 Personal Banking 2,314 25,537 64,596 4,782,027 Total $ 6,841 $ 81,088 $ 149,691 $ 11,388,150
Investment In Impaired Loans	The table below shows the Company’s investment in impaired loans at September 30, 2015 and December 31, 2014 . These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings under ASC 310-40. 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) Sept. 30, 2015 Dec. 31, 2014 Non-accrual loans $ 25,779 $ 40,775 Restructured loans (accruing) 29,602 40,313 Total impaired loans $ 55,381 $ 81,088
Additional Information About Impaired Loans Held	The following table provides additional information about impaired loans held by the Company at September 30, 2015 and December 31, 2014 , segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided. (In thousands) Recorded Investment Unpaid Principal Balance Related Allowance September 30, 2015 With no related allowance recorded: Business $ 9,692 $ 11,866 $ — Real estate – construction and land 2,072 7,679 — Real estate – business 1,535 2,969 — $ 13,299 $ 22,514 $ — With an allowance recorded: Business $ 8,292 $ 10,252 $ 681 Real estate – construction and land 3,327 4,939 288 Real estate – business 7,595 11,084 860 Real estate – personal 8,652 11,835 1,015 Consumer 5,461 5,461 70 Revolving home equity 492 492 13 Consumer credit card 8,263 8,263 569 $ 42,082 $ 52,326 $ 3,496 Total $ 55,381 $ 74,840 $ 3,496 December 31, 2014 With no related allowance recorded: Business $ 9,237 $ 11,532 $ — Real estate – construction and land 4,552 8,493 — Real estate – business 13,453 17,258 — Revolving home equity 1,227 1,384 — $ 28,469 $ 38,667 $ — With an allowance recorded: Business $ 12,326 $ 13,846 $ 1,844 Real estate – construction and land 8,148 9,610 1,081 Real estate – business 7,835 15,025 1,602 Real estate – personal 9,096 12,465 1,441 Consumer 4,244 4,244 50 Revolving home equity 529 529 9 Consumer credit card 10,441 10,441 814 $ 52,619 $ 66,160 $ 6,841 Total $ 81,088 $ 104,827 $ 6,841
Total Average Impaired Loans	Total average impaired loans for the three and nine month periods ended September 30, 2015 and 2014 , respectively, are shown in the table below. (In thousands) Commercial Personal Banking Total Average Impaired Loans: For the three months ended September 30, 2015 Non-accrual loans $ 21,119 $ 5,179 $ 26,298 Restructured loans (accruing) 13,399 18,221 31,620 Total $ 34,518 $ 23,400 $ 57,918 For the nine months ended September 30, 2015 Non-accrual loans $ 25,784 $ 5,791 $ 31,575 Restructured loans (accruing) 16,612 18,854 35,466 Total $ 42,396 $ 24,645 $ 67,041 For the three months ended September 30, 2014 Non-accrual loans $ 38,111 $ 7,267 $ 45,378 Restructured loans (accruing) 32,970 19,822 52,792 Total $ 71,081 $ 27,089 $ 98,170 For the nine months ended September 30, 2014 Non-accrual loans $ 38,099 $ 7,320 $ 45,419 Restructured loans (accruing) 37,157 20,660 57,817 Total $ 75,256 $ 27,980 $ 103,236
Interest Income Recognized On Impaired Loans	The table below shows interest income recognized during the three and nine month periods ended September 30, 2015 and 2014 , respectively, for impaired loans held at the end of each respective period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section on page 14. For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) 2015 2014 2015 2014 Interest income recognized on impaired loans: Business $ 63 $ 146 $ 188 $ 438 Real estate – construction and land 22 97 66 290 Real estate – business 33 58 99 173 Real estate – personal 47 53 142 160 Consumer 87 72 261 215 Revolving home equity 6 7 17 20 Consumer credit card 186 236 558 707 Total $ 444 $ 669 $ 1,331 $ 2,003
Aging Information On Past Due And Nonaccrual Loans	The following table provides aging information on the Company’s past due and accruing loans, in addition to the balances of loans on non-accrual status, at September 30, 2015 and December 31, 2014 . (In thousands) Current or Less Than 30 Days Past Due 30 – 89 Days Past Due 90 Days Past Due and Still Accruing Non-accrual Total September 30, 2015 Commercial: Business $ 4,391,674 $ 3,106 $ 375 $ 11,699 $ 4,406,854 Real estate – construction and land 529,117 1,262 — 4,046 534,425 Real estate – business 2,277,384 3,575 — 5,054 2,286,013 Personal Banking: Real estate – personal 1,904,280 8,695 2,695 4,980 1,920,650 Consumer 1,867,657 17,244 1,905 — 1,886,806 Revolving home equity 423,939 2,512 2,489 — 428,940 Consumer credit card 740,124 8,726 7,243 — 756,093 Overdrafts 4,204 289 — — 4,493 Total $ 12,138,379 $ 45,409 $ 14,707 $ 25,779 $ 12,224,274 December 31, 2014 Commercial: Business $ 3,946,144 $ 11,152 $ 1,096 $ 11,560 $ 3,969,952 Real estate – construction and land 397,488 827 35 5,157 403,507 Real estate – business 2,266,688 3,661 — 17,866 2,288,215 Personal Banking: Real estate – personal 1,868,606 6,618 1,676 6,192 1,883,092 Consumer 1,687,285 16,053 1,796 — 1,705,134 Revolving home equity 428,478 1,552 843 — 430,873 Consumer credit card 764,599 9,559 8,212 — 782,370 Overdrafts 5,721 374 — — 6,095 Total $ 11,365,009 $ 49,796 $ 13,658 $ 40,775 $ 11,469,238
Credit Quality Of Commercial Loan Portfolio	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 September 30, 2015 Pass $ 4,304,836 $ 527,590 $ 2,211,387 $ 7,043,813 Special mention 59,526 1,021 19,576 80,123 Substandard 30,793 1,768 49,996 82,557 Non-accrual 11,699 4,046 5,054 20,799 Total $ 4,406,854 $ 534,425 $ 2,286,013 $ 7,227,292 December 31, 2014 Pass $ 3,871,569 $ 385,831 $ 2,184,541 $ 6,441,941 Special mention 62,904 3,865 40,668 107,437 Substandard 23,919 8,654 45,140 77,713 Non-accrual 11,560 5,157 17,866 34,583 Total $ 3,969,952 $ 403,507 $ 2,288,215 $ 6,661,674
Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding	For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at September 30, 2015 and December 31, 2014 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card September 30, 2015 FICO score: Under 600 1.5 % 4.6 % 1.6 % 3.8 % 600 - 659 2.8 9.5 4.2 12.1 660 - 719 9.1 22.5 13.7 32.6 720 - 779 25.3 27.0 26.2 28.1 780 and over 61.3 36.4 54.3 23.4 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2014 FICO score: Under 600 1.4 % 5.2 % 1.8 % 4.1 % 600 - 659 3.1 10.2 4.4 11.8 660 - 719 9.9 22.9 13.7 32.4 720 - 779 26.7 28.0 32.8 27.8 780 and over 58.9 33.7 47.3 23.9 Total 100.0 % 100.0 % 100.0 % 100.0 %
Outstanding Balance Of Loans Classified As Troubled Debt Restructurings	The following table shows the outstanding balances of loans classified as troubled debt restructurings at September 30, 2015 , in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal. (In thousands) September 30, 2015 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 16,441 $ — Real estate - construction and land 5,222 1,499 Real estate - business 5,502 — Personal Banking: Real estate - personal 5,276 — Consumer 5,487 57 Revolving home equity 492 49 Consumer credit card 8,263 541 Total restructured loans $ 46,683 $ 2,146

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Investment Securities [Abstract]
Investment Securities, At Fair Value	nvestment securities, at fair value, consisted of the following at September 30, 2015 and December 31, 2014 . (In thousands) Sept. 30, 2015 Dec. 31, 2014 Available for sale $ 9,472,959 $ 9,523,560 Trading 14,463 15,357 Non-marketable 116,634 106,875 Total investment securities $ 9,604,056 $ 9,645,792
Summary Of Available For Sale Investment Securities By Maturity Groupings	A summary of the available for sale investment securities by maturity groupings as of September 30, 2015 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. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral. (In thousands) Amortized Cost Fair Value U.S. government and federal agency obligations: Within 1 year $ 59,884 $ 60,116 After 1 but within 5 years 163,996 167,780 After 5 but within 10 years 143,940 144,161 After 10 years 52,882 48,342 Total U.S. government and federal agency obligations 420,702 420,399 Government-sponsored enterprise obligations: Within 1 year 42,108 42,249 After 1 but within 5 years 477,115 482,232 After 5 but within 10 years 332,296 332,248 After 10 years 5,630 5,480 Total government-sponsored enterprise obligations 857,149 862,209 State and municipal obligations: Within 1 year 99,618 99,985 After 1 but within 5 years 667,923 685,757 After 5 but within 10 years 912,614 924,070 After 10 years 140,081 137,347 Total state and municipal obligations 1,820,236 1,847,159 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,508,870 2,575,835 Non-agency mortgage-backed securities 805,560 817,197 Asset-backed securities 2,585,088 2,584,688 Total mortgage and asset-backed securities 5,899,518 5,977,720 Other debt securities: Within 1 year 3,999 4,048 After 1 but within 5 years 83,398 83,613 After 5 but within 10 years 229,071 226,599 After 10 years 12,000 11,748 Total other debt securities 328,468 326,008 Equity securities 5,677 39,464 Total available for sale investment securities $ 9,331,750 $ 9,472,959
Available For Sale Securities Unrealized Gains And Losses By Security Type	For securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in accumulated other comprehensive income, by security type. (In thousands) Amortized Cost Gross Gross Fair Value September 30, 2015 U.S. government and federal agency obligations $ 420,702 $ 5,930 $ (6,233 ) $ 420,399 Government-sponsored enterprise obligations 857,149 7,809 (2,749 ) 862,209 State and municipal obligations 1,820,236 33,416 (6,493 ) 1,847,159 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,508,870 69,477 (2,512 ) 2,575,835 Non-agency mortgage-backed securities 805,560 12,285 (648 ) 817,197 Asset-backed securities 2,585,088 7,444 (7,844 ) 2,584,688 Total mortgage and asset-backed securities 5,899,518 89,206 (11,004 ) 5,977,720 Other debt securities 328,468 979 (3,439 ) 326,008 Equity securities 5,677 33,787 — 39,464 Total $ 9,331,750 $ 171,127 $ (29,918 ) $ 9,472,959 December 31, 2014 U.S. government and federal agency obligations $ 497,336 $ 9,095 $ (5,024 ) $ 501,407 Government-sponsored enterprise obligations 968,574 2,593 (8,040 ) 963,127 State and municipal obligations 1,789,215 32,340 (8,354 ) 1,813,201 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,523,377 75,923 (5,592 ) 2,593,708 Non-agency mortgage-backed securities 372,911 11,061 (1,228 ) 382,744 Asset-backed securities 3,090,174 6,922 (5,103 ) 3,091,993 Total mortgage and asset-backed securities 5,986,462 93,906 (11,923 ) 6,068,445 Other debt securities 140,784 420 (2,043 ) 139,161 Equity securities 3,931 34,288 — 38,219 Total $ 9,386,302 $ 172,642 $ (35,384 ) $ 9,523,560
Cash Flow Model Inputs Used To Calculate Credit Losses	ignificant inputs to the cash flow models used to calculate the credit losses on these securities at September 30, 2015 included the following: Significant Inputs Range Prepayment CPR 1% - 25% Projected cumulative default 17% - 54% Credit support 0% - 22% Loss severity 20% - 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 Nine Months Ended September 30 (In thousands) 2015 2014 Cumulative OTTI credit losses at January 1 $ 13,734 $ 12,499 Credit losses on debt securities for which impairment was not previously recognized 76 — Credit losses on debt securities for which impairment was previously recognized 407 1,348 Increase in expected cash flows that are recognized over remaining life of security (73 ) (97 ) Cumulative OTTI credit losses at September 30 $ 14,144 $ 13,750
Securities With Unrealized Losses And Length Of Impairment Period	Securities with unrealized losses recorded in accumulated other comprehensive income are shown in the table below, along with the length of the impairment period. Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2015 U.S. government and federal agency obligations $ 158,390 $ 1,701 $ 31,479 $ 4,532 $ 189,869 $ 6,233 Government-sponsored enterprise obligations 11,419 57 110,123 2,692 121,542 2,749 State and municipal obligations 120,098 703 110,550 5,790 230,648 6,493 Mortgage and asset-backed securities: Agency mortgage-backed securities 64,863 259 305,767 2,253 370,630 2,512 Non-agency mortgage-backed securities 199,875 361 53,765 287 253,640 648 Asset-backed securities 998,031 5,542 152,502 2,302 1,150,533 7,844 Total mortgage and asset-backed securities 1,262,769 6,162 512,034 4,842 1,774,803 11,004 Other debt securities 179,566 2,490 25,565 949 205,131 3,439 Total $ 1,732,242 $ 11,113 $ 789,751 $ 18,805 $ 2,521,993 $ 29,918 December 31, 2014 U.S. government and federal agency obligations $ 90,261 $ 818 $ 32,077 $ 4,206 $ 122,338 $ 5,024 Government-sponsored enterprise obligations 224,808 922 224,779 7,118 449,587 8,040 State and municipal obligations 172,980 646 215,702 7,708 388,682 8,354 Mortgage and asset-backed securities: Agency mortgage-backed securities 55,128 429 381,617 5,163 436,745 5,592 Non-agency mortgage-backed securities 141,655 609 43,659 619 185,314 1,228 Asset-backed securities 1,424,457 2,009 159,098 3,094 1,583,555 5,103 Total mortgage and asset-backed securities 1,621,240 3,047 584,374 8,876 2,205,614 11,923 Other debt securities 16,434 55 80,203 1,988 96,637 2,043 Total $ 2,125,723 $ 5,488 $ 1,137,135 $ 29,896 $ 3,262,858 $ 35,384
State And Municipal Obligations, By State And Economic Sector	The portfolio is diversified in order to reduce risk, and information about the top five largest holdings, by state and economic sector, is shown in the table below. The Company has processes and procedures in place to monitor its holdings, identify signs of financial distress and, if necessary, exit its positions in a timely manner. % of Portfolio Average Life (in years) Average Rating (Moody’s) At September 30, 2015 Texas 12.1 % 6.1 Aa2 Florida 7.0 4.5 Aa3 New York 6.9 6.8 Aa2 Ohio 6.7 6.1 Aa2 Washington 5.4 5.7 Aa2 General obligation 37.7 % 5.6 Aa2 Lease 18.9 5.5 Aa2 Transportation 12.9 4.7 A1 Housing 12.9 6.4 Aa1 Limited tax 8.9 6.5 Aa2
Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses	The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Nine Months Ended September 30 (In thousands) 2015 2014 Proceeds from sales of available for sale securities $ 675,870 $ 30,998 Proceeds from sales of non-marketable securities 9,023 33,043 Total proceeds $ 684,893 $ 64,041 Available for sale: Gains realized on sales $ 2,813 $ — Losses realized on sales — (5,197 ) Gain realized on donation — 1,570 Other-than-temporary impairment recognized on debt securities (483 ) (1,348 ) Non-marketable: Gains realized on sales 2,516 1,613 Losses realized on sales — (134 ) Fair value adjustments, net 2,954 13,970 Investment securities gains, net $ 7,800 $ 10,474

Goodwill And Other Intangible26

Goodwill And Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Intangible Assets With Estimable Useful Lives	The following table presents information about the Company's intangible assets which have estimable useful lives. September 30, 2015 December 31, 2014 (In thousands) Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Amortizable intangible assets: Core deposit premium $ 31,270 $ (25,905 ) $ — $ 5,365 $ 31,270 $ (24,698 ) $ — $ 6,572 Mortgage servicing rights 4,400 (2,901 ) (38 ) 1,461 3,693 (2,718 ) (97 ) 878 Total $ 35,670 $ (28,806 ) $ (38 ) $ 6,826 $ 34,963 $ (27,416 ) $ (97 ) $ 7,450
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 September 30, 2015 . The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. (In thousands) 2015 $ 1,753 2016 1,374 2017 1,033 2018 786 2019 649
Schedule Of Changes In CArrying Amount Of Goodwill And Net Other Intangible Assets	Changes in the carrying amount of goodwill and net other intangible assets for the nine month period ended September 30, 2015 is as follows. (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance January 1, 2015 $ 138,921 $ 6,572 $ 878 Originations — — 707 Amortization — (1,207 ) (183 ) Impairment reversal — — 59 Balance September 30, 2015 $ 138,921 $ 5,365 $ 1,461
Schedule Of Goodwill Allocated By Operating Segments	Goodwill allocated to the Company’s operating segments at September 30, 2015 and December 31, 2014 is shown below. (In thousands) Consumer segment $ 70,721 Commercial segment 67,454 Wealth segment 746 Total goodwill $ 138,921

Pension (Tables)

Pension (Tables)	9 Months Ended
	Sep. 30, 2015
Pension [Abstract]
Net Pension Cost	The amount of net pension cost is shown in the table below: For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) 2015 2014 2015 2014 Service cost - benefits earned during the period $ 127 $ 133 $ 379 $ 399 Interest cost on projected benefit obligation 1,139 1,262 3,571 3,785 Expected return on plan assets (1,523 ) (1,561 ) (4,569 ) (4,683 ) Amortization of prior service cost (203 ) — (203 ) — Amortization of unrecognized net loss 660 359 1,969 1,079 Net periodic pension cost $ 200 $ 193 $ 1,147 $ 580

Common Stock (Tables)

Common Stock (Tables)	9 Months Ended
	Sep. 30, 2015
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 September 30 For the Nine Months Ended September 30 (In thousands, except per share data) 2015 2014 2015 2014 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 64,612 $ 68,185 $ 200,020 $ 199,029 Less preferred stock dividends 2,250 1,800 6,750 1,800 Net income available to common shareholders 62,362 66,385 193,270 197,229 Less income allocated to nonvested restricted stock 884 879 2,677 2,537 Net income allocated to common stock $ 61,478 $ 65,506 $ 190,593 $ 194,692 Weighted average common shares outstanding 91,989 95,104 93,874 97,591 Basic income per common share $ .67 $ .69 $ 2.03 $ 2.00 Diluted income per common share: Net income available to common shareholders $ 62,362 $ 66,385 $ 193,270 $ 197,229 Less income allocated to nonvested restricted stock 883 877 2,672 2,530 Net income allocated to common stock $ 61,479 $ 65,508 $ 190,598 $ 194,699 Weighted average common shares outstanding 91,989 95,104 93,874 97,591 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 280 412 300 419 Weighted average diluted common shares outstanding 92,269 95,516 94,174 98,010 Diluted income per common share $ .66 $ .69 $ 2.02 $ 1.99

Accumulated Other Comprehensi29

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2015
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 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 (2) Total Accumulated Other Comprehensive Income (In thousands) OTTI Other Balance January 1, 2015 $ 3,791 $ 81,310 $ (23,008 ) $ 62,093 Other comprehensive income (loss) before reclassifications (976 ) 7,255 — 6,279 Amounts reclassified from accumulated other comprehensive income 483 (2,813 ) 1,766 (564 ) Current period other comprehensive income (loss), before tax (493 ) 4,442 1,766 5,715 Income tax (expense) benefit 187 (1,688 ) (671 ) (2,172 ) Current period other comprehensive income (loss), net of tax (306 ) 2,754 1,095 3,543 Transfer of unrealized gain on securities for which impairment was not previously recognized 43 (43 ) — — Balance September 30, 2015 $ 3,528 $ 84,021 $ (21,913 ) $ 65,636 Balance January 1, 2014 $ 4,203 $ 21,303 $ (15,775 ) $ 9,731 Other comprehensive income (loss) before reclassifications (1,568 ) 76,965 — 75,397 Amounts reclassified from accumulated other comprehensive income 1,348 3,627 1,079 6,054 Current period other comprehensive income (loss), before tax (220 ) 80,592 1,079 81,451 Income tax (expense) benefit 84 (30,625 ) (410 ) (30,951 ) Current period other comprehensive income (loss), net of tax (136 ) 49,967 669 50,500 Balance September 30, 2014 $ 4,067 $ 71,270 $ (15,106 ) $ 60,231

Segments (Tables)

Segments (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Schedule Of Financial Information By Segment	The following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Three Months Ended September 30, 2015 Net interest income $ 67,083 $ 74,008 $ 10,391 $ 151,482 $ 10,556 $ 162,038 Provision for loan losses (8,605 ) 166 106 (8,333 ) (31 ) (8,364 ) Non-interest income 30,809 47,485 34,042 112,336 (1,188 ) 111,148 Investment securities losses, net — — — — (378 ) (378 ) Non-interest expense (69,196 ) (68,710 ) (27,211 ) (165,117 ) (6,145 ) (171,262 ) Income before income taxes $ 20,091 $ 52,949 $ 17,328 $ 90,368 $ 2,814 $ 93,182 Nine Months Ended September 30, 2015 Net interest income $ 199,265 $ 218,386 $ 31,921 $ 449,572 $ 22,261 $ 471,833 Provision for loan losses (25,500 ) 842 114 (24,544 ) 5,003 (19,541 ) Non-interest income 87,409 144,684 102,336 334,429 (2,763 ) 331,666 Investment securities gains, net — — — — 7,800 7,800 Non-interest expense (203,446 ) (199,027 ) (81,498 ) (483,971 ) (16,308 ) (500,279 ) Income before income taxes $ 57,728 $ 164,885 $ 52,873 $ 275,486 $ 15,993 $ 291,479 Three Months Ended September 30, 2014 Net interest income $ 66,565 $ 72,019 $ 9,811 $ 148,395 $ 6,321 $ 154,716 Provision for loan losses (8,306 ) 863 (29 ) (7,472 ) (180 ) (7,652 ) Non-interest income 29,699 47,689 33,368 110,756 1,530 112,286 Investment securities losses, net — — — — 2,995 2,995 Non-interest expense (65,900 ) (63,542 ) (23,833 ) (153,275 ) (8,565 ) (161,840 ) Income before income taxes $ 22,058 $ 57,029 $ 19,317 $ 98,404 $ 2,101 $ 100,505 Nine Months Ended September 30, 2014 Net interest income $ 198,533 $ 214,406 $ 29,713 $ 442,652 $ 25,623 $ 468,275 Provision for loan losses (25,816 ) 803 463 (24,550 ) (317 ) (24,867 ) Non-interest income 84,331 142,326 94,870 321,527 2,149 323,676 Investment securities gains, net — — — — 10,474 10,474 Non-interest expense (197,220 ) (188,223 ) (72,606 ) (458,049 ) (28,306 ) (486,355 ) Income before income taxes $ 59,828 $ 169,312 $ 52,440 $ 281,580 $ 9,623 $ 291,203

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instrument Detail [Abstract]
Schedule Of Notional Amounts Of Derivative Instruments	(In thousands) September 30, 2015 December 31, 2014 Interest rate swaps $ 906,559 $ 647,709 Interest rate caps 41,603 53,587 Credit risk participation agreements 70,736 75,943 Foreign exchange contracts 17,751 19,791 Mortgage loan commitments 12,473 — Mortgage loan forward sale contracts 1,280 — Forward TBA contracts 12,000 — Total notional amount $ 1,062,402 $ 797,030
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. Derivative instruments with a positive fair value (asset derivatives) are reported in other assets in the consolidated balance sheets, while derivative instruments with a negative fair value (liability derivatives) are reported in other liabilities in the consolidated balance sheets. Information about the valuation methods used to determine fair value is provided in Note 13 on Fair Value Measurements. Asset Derivatives Liability Derivatives Sept. 30, 2015 Dec. 31, 2014 Sept. 30, 2015 Dec. 31, 2014 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 15,681 $ 10,144 $ (15,681 ) $ (10,166 ) Interest rate caps 16 62 (16 ) (62 ) Credit risk participation agreements 2 3 (234 ) (226 ) Foreign exchange contracts 219 248 (197 ) (494 ) Mortgage loan commitments 451 — — — Mortgage loan forward sale contracts — — (5 ) — Forward TBA contracts — — (118 ) — Total $ 16,369 $ 10,457 $ (16,251 ) $ (10,948 )
Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income	The effects of derivative instruments on the consolidated statements of income are shown in the table below. Location of Gain or (Loss) Recognized in Income on Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended September 30 For the Nine Months Ended September 30 (In thousands) 2015 2014 2015 2014 Derivative instruments: Interest rate swaps Other non-interest income $ 741 $ 212 $ 3,551 $ 1,023 Interest rate caps Other non-interest income — 13 — 13 Credit risk participation agreements Other non-interest income (57 ) (21 ) (9 ) 177 Foreign exchange contracts Other non-interest income (55 ) 176 267 134 Mortgage loan commitments Loan fees and sales 106 — 451 — Mortgage loan forward sale contracts Loan fees and sales (6 ) — (5 ) — Forward TBA contracts Loan fees and sales (370 ) — 15 — Total $ 359 $ 380 $ 4,270 $ 1,347
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 Collateral Received/Pledged Net Amount September 30, 2015 Assets: Derivatives subject to master netting agreements $ 15,700 $ — $ 15,700 $ (16 ) $ — $ 15,684 Derivatives not subject to master netting agreements 669 — 669 Total derivatives 16,369 — 16,369 Liabilities: Derivatives subject to master netting agreements $ 16,052 $ — $ 16,052 $ (16 ) $ (14,456 ) $ 1,580 Derivatives not subject to master netting agreements 199 — 199 Total derivatives 16,251 — 16,251 December 31, 2014 Assets: Derivatives subject to master netting agreements $ 10,209 $ — $ 10,209 $ (251 ) $ — $ 9,958 Derivatives not subject to master netting agreements 248 — 248 Total derivatives 10,457 — 10,457 Liabilities: Derivatives subject to master netting agreements $ 10,454 $ — $ 10,454 $ (251 ) $ (8,738 ) $ 1,465 Derivatives not subject to master netting agreements 494 — 494 Total derivatives 10,948 — 10,948

Resale and Repurchase Agreeme32

Resale and Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2015
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 Securities Collateral Received/Pledged Net Amount September 30, 2015 Total resale agreements, subject to master netting arrangements $ 1,325,000 $ (350,000 ) $ 975,000 $ — $ (975,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,981,497 (350,000 ) 1,631,497 — (1,631,497 ) — December 31, 2014 Total resale agreements, subject to master netting arrangements $ 1,500,000 $ (450,000 ) $ 1,050,000 $ — $ (1,049,370 ) $ 630 Total repurchase agreements, subject to master netting arrangements 2,308,678 (450,000 ) 1,858,678 — (1,858,678 ) —
Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]	Remaining Contractual Maturity of the Agreements (In thousands) Overnight and continuous Up to 90 days Greater than 90 days Total September 30, 2015 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 151,015 $ 11,937 $ — $ 162,952 Government-sponsored enterprise obligations 361,228 3,298 17,928 382,454 Agency mortgage-backed securities 335,300 93,104 232,072 660,476 Asset-backed securities 690,615 85,000 — 775,615 Total repurchase agreements, gross amount recognized $ 1,538,158 $ 193,339 $ 250,000 $ 1,981,497

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Share-based Compensation [Abstract]
Summary Of The Status Of Nonvested Share Awards	A summary of the status of the Company’s nonvested share awards as of September 30, 2015 , and changes during the nine month period then ended, is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2015 1,259,689 $34.41 Granted 215,245 41.69 Vested (141,877 ) 30.11 Forfeited (15,936 ) 34.79 Nonvested at September 30, 2015 1,317,121 $36.05
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 $7.58 Assumptions: Dividend yield 2.2 % Volatility 21.3 % Risk-free interest rate 1.8 % Expected term 7.2 years
Summary Of Option Activity	A summary of option activity during the first nine months of 2015 is presented below. (Dollars in thousands, except per share data) Shares Weighted Average Exercise Price Outstanding at January 1, 2015 68,675 $29.27 Granted — — Forfeited — — Expired — — Exercised (68,675 ) 29.27 Outstanding at September 30, 2015 $ — $ —
Summary Of SAR Activity	A summary of SAR activity during the first nine months of 2015 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, 2015 1,780,578 $33.96 Granted 240,267 41.40 Forfeited (6,182 ) 39.04 Expired (1,076 ) 37.31 Exercised (411,126 ) 32.94 Outstanding at September 30, 2015 1,602,461 $35.32 4.4 years $ 16,412

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Measurements [Abstract]
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The table below presents the September 30, 2015 and December 31, 2014 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first nine months of 2015 or the year ended December 31, 2014 . Fair Value Measurements Using (In thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2015 Assets: Residential mortgage loans held for sale $ 2,173 $ — $ 2,173 $ — Available for sale securities: U.S. government and federal agency obligations 420,399 420,399 — — Government-sponsored enterprise obligations 862,209 — 862,209 — State and municipal obligations 1,847,159 — 1,753,970 93,189 Agency mortgage-backed securities 2,575,835 — 2,575,835 — Non-agency mortgage-backed securities 817,197 — 817,197 — Asset-backed securities 2,584,688 — 2,584,688 — Other debt securities 326,008 — 326,008 — Equity securities 39,464 19,509 19,955 — Trading securities 14,463 — 14,463 — Private equity investments 66,875 — — 66,875 Derivatives * 16,369 — 15,916 453 Assets held in trust 8,825 8,825 — — Total assets $ 9,581,664 $ 448,733 $ 8,972,414 $ 160,517 Liabilities: Derivatives * $ 16,251 $ — $ 16,017 $ 234 Total liabilities $ 16,251 $ — $ 16,017 $ 234 December 31, 2014 Assets: Available for sale securities: U.S. government and federal agency obligations $ 501,407 $ 501,407 $ — $ — Government-sponsored enterprise obligations 963,127 — 963,127 — State and municipal obligations 1,813,201 — 1,718,058 95,143 Agency mortgage-backed securities 2,593,708 — 2,593,708 — Non-agency mortgage-backed securities 382,744 — 382,744 — Asset-backed securities 3,091,993 — 3,091,993 — Other debt securities 139,161 — 139,161 — Equity securities 38,219 17,975 20,244 — Trading securities 15,357 — 15,357 — Private equity investments 57,581 — — 57,581 Derivatives * 10,457 — 10,454 3 Assets held in trust 8,848 8,848 — — Total assets $ 9,615,803 $ 528,230 $ 8,934,846 $ 152,727 Liabilities: Derivatives * $ 10,948 $ — $ 10,722 $ 226 Total liabilities $ 10,948 $ — $ 10,722 $ 226
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis	Assets held in an outside trust for the Company’s deferred compensation plan consist of investments in mutual funds. The fair value measurements are based on quoted prices in active markets and classified as Level 1. The Company has recorded an asset representing the total investment amount. The Company has also recorded a corresponding nonfinancial liability, representing the Company’s liability to the plan participants. The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (In thousands) State and Municipal Obligations Private Equity Investments Derivatives Total For the three months ended September 30, 2015 Balance June 30, 2015 $ 92,940 $ 58,726 $ 170 $ 151,836 Total gains or losses (realized/unrealized): Included in earnings — (1,221 ) 49 (1,172 ) Included in other comprehensive income * 227 — — 227 Discount accretion 22 — — 22 Purchases of private equity investments — 9,370 — 9,370 Balance September 30, 2015 $ 93,189 $ 66,875 $ 219 $ 160,283 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 $ — $ (1,221 ) $ 394 $ (827 ) For the nine months ended September 30, 2015 Balance January 1, 2015 $ 95,143 $ 57,581 $ (223 ) $ 152,501 Total gains or losses (realized/unrealized): Included in earnings — 2,954 442 3,396 Included in other comprehensive income * (127 ) — — (127 ) Investment securities called (2,000 ) — — (2,000 ) Discount accretion 173 — — 173 Purchases of private equity investments — 11,023 — 11,023 Sale/pay down of private equity investments — (4,800 ) — (4,800 ) Capitalized interest/dividends — 117 — 117 Balance September 30, 2015 $ 93,189 $ 66,875 $ 219 $ 160,283 Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 $ — $ 2,954 $ 442 $ 3,396 For the three months ended September 30, 2014 Balance June 30, 2014 $ 132,108 $ 44,192 $ (188 ) $ 176,112 Total gains or losses (realized/unrealized): Included in earnings — 3,225 (21 ) 3,204 Included in other comprehensive income * (921 ) — — (921 ) Discount accretion 40 — — 40 Purchases of private equity investments — 4,575 — 4,575 Capitalized interest/dividends — 45 — 45 Purchase of risk participation agreement — — 41 41 Balance September 30, 2014 $ 131,227 $ 52,037 $ (168 ) $ 183,096 Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ 3,225 $ (21 ) $ 3,204 For the nine months ended September 30, 2014 Balance January 1, 2014 $ 127,724 $ 56,612 $ (65 ) $ 184,271 Total gains or losses (realized/unrealized): Included in earnings — 15,161 177 15,338 Included in other comprehensive income * 3,383 — — 3,383 Discount accretion 120 — — 120 Purchases of private equity investments — 11,575 — 11,575 Sale/pay down of private equity investments — (31,423 ) — (31,423 ) Capitalized interest/dividends — 112 — 112 Purchase of risk participation agreement — — 41 41 Sale of risk participation agreement — — (321 ) (321 ) Balance September 30, 2014 $ 131,227 $ 52,037 $ (168 ) $ 183,096 Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ (3,232 ) $ 173 $ (3,059 )
Summary Of Gains And Losses On Level 3 Assets And Liabilities	Gains and losses included in earnings for the Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income: (In thousands) Loan Fees and Sales Other Non-Interest Income Investment Securities Gains (Losses), Net Total For the three months ended September 30, 2015 Total gains or losses included in earnings $ 106 $ (57 ) $ (1,221 ) $ (1,172 ) Change in unrealized gains or losses relating to assets still held at September 30, 2015 $ 451 $ (57 ) $ (1,221 ) $ (827 ) For the nine months ended September 30, 2015 Total gains or losses included in earnings $ 451 $ (9 ) $ 2,954 $ 3,396 Change in unrealized gains or losses relating to assets still held at September 30, 2015 $ 451 $ (9 ) $ 2,954 $ 3,396 For the three months ended September 30, 2014 Total gains or losses included in earnings $ — $ (21 ) $ 3,225 $ 3,204 Change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ (21 ) $ 3,225 $ 3,204 For the nine months ended September 30, 2014 Total gains or losses included in earnings $ — $ 177 $ 15,161 $ 15,338 Change in unrealized gains or losses relating to assets still held at September 30, 2014 $ — $ 173 $ (3,232 ) $ (3,059 )
Summary Of Quantitative Information About Level 3 Fair Value Measurements	s As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $93.2 million at September 30, 2015 , while private equity investments, included in non-marketable securities, totaled $66.9 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 3 - 5 years Estimated market rate 2.3% - 7.1% Private equity investments Market comparable companies EBITDA multiple 4.0 - 5.5 Mortgage loan commitments Discounted cash flow Probability of funding 60.5% - 100.0% 82.4% Embedded servicing value .9% - 1.0% 1.0%
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 nine months of 2015 and 2014 , and still held as of September 30, 2015 and 2014 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at September 30, 2015 and 2014 . Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Gains (Losses) Recognized During the Nine Months Ended September 30 September 30, 2015 Collateral dependent impaired loans $ 6,860 $ — $ — $ 6,860 $ (1,794 ) Mortgage servicing rights 1,461 — — 1,461 59 Foreclosed assets 479 — — 479 (193 ) Long-lived assets 937 — — 937 (1,366 ) September 30, 2014 Collateral dependent impaired loans $ 17,015 $ — $ — $ 17,015 $ (2,797 ) Private equity investments 1,309 — — 1,309 (1,191 ) Mortgage servicing rights 777 — — 777 13 Foreclosed assets 850 — — 850 (275 ) Long-lived assets 8,528 — — 8,528 (1,890 )

Fair Value Of Financial Instr35

Fair Value Of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Of Financial Instruments [Abstract]
Fair value of financial instruments [Table Text Block]	Fair Value Hierarchy Level September 30, 2015 December 31, 2014 (In thousands) Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Financial Assets Loans: Business Level 3 $ 4,406,854 $ 4,438,854 $ 3,969,952 $ 3,982,531 Real estate - construction and land Level 3 534,425 541,912 403,507 407,905 Real estate - business Level 3 2,286,013 2,327,496 2,288,215 2,315,378 Real estate - personal Level 3 1,920,650 1,968,453 1,883,092 1,933,456 Consumer Level 3 1,886,806 1,885,963 1,705,134 1,701,037 Revolving home equity Level 3 428,940 431,324 430,873 433,508 Consumer credit card Level 3 756,093 769,878 782,370 794,929 Overdrafts Level 3 4,493 4,493 6,095 6,095 Loans held for sale Level 2 4,143 4,143 — — Investment securities: Available for sale Level 1 439,908 439,908 519,382 519,382 Available for sale Level 2 8,939,862 8,939,862 8,909,035 8,909,035 Available for sale Level 3 93,189 93,189 95,143 95,143 Trading Level 2 14,463 14,463 15,357 15,357 Non-marketable Level 3 116,634 116,634 106,875 106,875 Federal funds sold Level 1 32,550 32,550 32,485 32,485 Securities purchased under agreements to resell Level 3 975,000 978,480 1,050,000 1,048,866 Interest earning deposits with banks Level 1 42,078 42,078 600,744 600,744 Cash and due from banks Level 1 384,122 384,122 467,488 467,488 Derivative instruments Level 2 15,916 15,916 10,454 10,454 Derivative instruments Level 3 453 453 3 3 Financial Liabilities Non-interest bearing deposits Level 1 $ 6,699,873 $ 6,699,873 $ 6,811,959 $ 6,811,959 Savings, interest checking and money market deposits Level 1 10,295,260 10,295,260 10,541,601 10,541,601 Time open and certificates of deposit Level 3 1,991,627 1,991,741 2,122,218 2,121,114 Federal funds purchased Level 1 561,700 561,700 3,840 3,840 Securities sold under agreements to repurchase Level 3 1,631,497 1,631,562 1,858,678 1,858,731 Other borrowings Level 3 103,831 109,939 104,058 111,102 Derivative instruments Level 2 16,017 16,017 10,722 10,722 Derivative instruments Level 3 234 234 226 226

Principles Of Consolidation A36

Principles Of Consolidation And Presentation Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amortization Method Qualified Affordable Housing Project Investments Amortization	$ 1.5	$ 1.1

Loans And Allowance For Loan 37

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
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	$ 3,600,000
Loans Pledged to the Federal Reserve Bank as collateral for discount window borrowings	1,400,000
Troubled Debt Restructured Loans	46,700
Accruing Restructured Loans	29,602	$ 40,313
Restructured Loans NonAccrual	17,100
Restructured commercial loans performing under their modified terms	12,500
Aggregate restructured credit card loans held	8,300
Restructured Loans Due to Bankruptcy Proceeding	$ 8,500
Period after which loans are deemed in default (in days)	90 days
Effect on Interest Income Resulting From Modification to Credit Card Loans	$ (1,000)
Commitments to lend additional funds to customers with restructured loans	1,600
Fair Value of Personal Real Estate Loans Held for Sale	2,200
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	2,100
Student Loans Held for Sale, Lower of Cost or Fair Value	2,000
Foreclosed real estate	3,100	5,500
Personal property acquired in repossession	$ 3,100	$ 2,400

Loans And Allowance For Loan 38

Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 12,224,274	$ 11,469,238
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	4,406,854	3,969,952
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	534,425	403,507
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,286,013	2,288,215
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,920,650	1,883,092
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	1,886,806	1,705,134
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	428,940	430,873
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	756,093	782,370
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 4,493	$ 6,095

Loans And Allowance For Loan 39

Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 151,532	$ 161,532	$ 156,532	$ 161,532
Provision	8,364	7,652	19,541	24,867
Loans charged off	12,224	12,100	37,229	38,951
Less recoveries on loans	3,860	4,448	12,688	14,084
Net loan charge-offs	8,364	7,652	24,541	24,867
Balance at end of period	151,532	161,532	151,532	161,532
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	86,329	98,928	89,622	94,189
Provision	(1,976)	(717)	(6,089)	3,836
Loans charged off	903	686	3,035	3,034
Less recoveries on loans	1,167	1,431	4,119	3,965
Net loan charge-offs	(264)	(745)	(1,084)	(931)
Balance at end of period	84,617	98,956	84,617	98,956
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	65,203	62,604	66,910	67,343
Provision	10,340	8,369	25,630	21,031
Loans charged off	11,321	11,414	34,194	35,917
Less recoveries on loans	2,693	3,017	8,569	10,119
Net loan charge-offs	8,628	8,397	25,625	25,798
Balance at end of period	$ 66,915	$ 62,576	$ 66,915	$ 62,576

Loans And Allowance For Loan 40

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	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	$ 12,168,893	$ 11,388,150
Impaired Financing Receivable, Recorded Investment	55,381	81,088
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	148,036	149,691
Impaired Financing Receivable, Related Allowance	3,496	6,841
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	7,194,779	6,606,123
Impaired Financing Receivable, Recorded Investment	32,513	55,551
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	82,788	85,095
Impaired Financing Receivable, Related Allowance	1,829	4,527
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	4,974,114	4,782,027
Impaired Financing Receivable, Recorded Investment	22,868	25,537
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	65,248	64,596
Impaired Financing Receivable, Related Allowance	$ 1,667	$ 2,314

Loans And Allowance For Loan 41

Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 25,779	$ 40,775
Restructured loans (accruing)	29,602	40,313
Total impaired loans	$ 55,381	$ 81,088

Loans And Allowance For Loan 42

Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 13,299	$ 28,469
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	22,514	38,667
Impaired Financing Receivable, with Related Allowance, Recorded Investment	42,082	52,619
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	52,326	66,160
Impaired Financing Receivable, Related Allowance	3,496	6,841
Impaired Financing Receivable, Recorded Investment	55,381	81,088
Impaired Financing Receivable, Unpaid Principal Balance	74,840	104,827
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,692	9,237
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	11,866	11,532
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,292	12,326
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,252	13,846
Impaired Financing Receivable, Related Allowance	681	1,844
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,072	4,552
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,679	8,493
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,327	8,148
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,939	9,610
Impaired Financing Receivable, Related Allowance	288	1,081
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,535	13,453
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,969	17,258
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,595	7,835
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,084	15,025
Impaired Financing Receivable, Related Allowance	860	1,602
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,652	9,096
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	11,835	12,465
Impaired Financing Receivable, Related Allowance	1,015	1,441
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,461	4,244
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,461	4,244
Impaired Financing Receivable, Related Allowance	70	50
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	1,227
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	1,384
Impaired Financing Receivable, with Related Allowance, Recorded Investment	492	529
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	492	529
Impaired Financing Receivable, Related Allowance	13	9
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,263	10,441
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,263	10,441
Impaired Financing Receivable, Related Allowance	$ 569	$ 814

Loans And Allowance For Loan 43

Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 26,298	$ 45,378	$ 31,575	$ 45,419
Restructured loans (accruing)	31,620	52,792	35,466	57,817
Total	57,918	98,170	67,041	103,236
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	21,119	38,111	25,784	38,099
Restructured loans (accruing)	13,399	32,970	16,612	37,157
Total	34,518	71,081	42,396	75,256
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	5,179	7,267	5,791	7,320
Restructured loans (accruing)	18,221	19,822	18,854	20,660
Total	$ 23,400	$ 27,089	$ 24,645	$ 27,980

Loans And Allowance For Loan 44

Loans And Allowance For Loan Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 444	$ 669	$ 1,331	$ 2,003
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	63	146	188	438
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	22	97	66	290
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	33	58	99	173
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	47	53	142	160
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	87	72	261	215
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	6	7	17	20
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 186	$ 236	$ 558	$ 707

Loans And Allowance For Loan 45

Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	$ 12,138,379	$ 11,365,009
30 - 89 Days Past Due	45,409	49,796
90 Days Past Due and Still Accruing	14,707	13,658
Non-accrual	25,779	40,775
Total	12,224,274	11,469,238
Business [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	4,391,674	3,946,144
30 - 89 Days Past Due	3,106	11,152
90 Days Past Due and Still Accruing	375	1,096
Non-accrual	11,699	11,560
Total	4,406,854	3,969,952
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	529,117	397,488
30 - 89 Days Past Due	1,262	827
90 Days Past Due and Still Accruing	0	35
Non-accrual	4,046	5,157
Total	534,425	403,507
Real Estate - Business [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,277,384	2,266,688
30 - 89 Days Past Due	3,575	3,661
90 Days Past Due and Still Accruing	0	0
Non-accrual	5,054	17,866
Total	2,286,013	2,288,215
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	1,904,280	1,868,606
30 - 89 Days Past Due	8,695	6,618
90 Days Past Due and Still Accruing	2,695	1,676
Non-accrual	4,980	6,192
Total	1,920,650	1,883,092
Consumer [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	1,867,657	1,687,285
30 - 89 Days Past Due	17,244	16,053
90 Days Past Due and Still Accruing	1,905	1,796
Non-accrual	0	0
Total	1,886,806	1,705,134
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	423,939	428,478
30 - 89 Days Past Due	2,512	1,552
90 Days Past Due and Still Accruing	2,489	843
Non-accrual	0	0
Total	428,940	430,873
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	740,124	764,599
30 - 89 Days Past Due	8,726	9,559
90 Days Past Due and Still Accruing	7,243	8,212
Non-accrual	0	0
Total	756,093	782,370
Overdrafts [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	4,204	5,721
30 - 89 Days Past Due	289	374
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Total	$ 4,493	$ 6,095

Loans And Allowance For Loan 46

Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	$ 7,227,292	$ 6,661,674
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	7,043,813	6,441,941
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	80,123	107,437
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	82,557	77,713
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	20,799	34,583
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	4,406,854	3,969,952
Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	4,304,836	3,871,569
Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	59,526	62,904
Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	30,793	23,919
Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	11,699	11,560
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	534,425	403,507
Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	527,590	385,831
Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	1,021	3,865
Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	1,768	8,654
Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	4,046	5,157
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	2,286,013	2,288,215
Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	2,211,387	2,184,541
Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	19,576	40,668
Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	49,996	45,140
Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial	$ 5,054	$ 17,866

Loans And Allowance For Loan 47

Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 256.9	$ 244.3
Credit quality personal banking loan table percentage loans excluded	5.10%
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	1.50%	1.40%
Real Estate - Personal [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.80%	3.10%
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	9.10%	9.90%
Real Estate - Personal [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	25.30%	26.70%
Real Estate - Personal [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	61.30%	58.90%
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	4.60%	5.20%
Consumer [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.50%	10.20%
Consumer [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.50%	22.90%
Consumer [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.00%	28.00%
Consumer [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	36.40%	33.70%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.60%	1.80%
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	4.20%	4.40%
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	13.70%	13.70%
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	26.20%	32.80%
Revolving Home Equity [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	54.30%	47.30%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.80%	4.10%
Consumer Credit Card [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.10%	11.80%
Consumer Credit Card [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	32.60%	32.40%
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	28.10%	27.80%
Consumer Credit Card [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.40%	23.90%

Loans And Allowance For Loan 48

Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) $ in Thousands	Sep. 30, 2015USD ($)
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	$ 46,683
Balance 90 days past due at any time during previous 12 months	2,146
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	16,441
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,222
Balance 90 days past due at any time during previous 12 months	1,499
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,502
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,276
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	5,487
Balance 90 days past due at any time during previous 12 months	57
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	492
Balance 90 days past due at any time during previous 12 months	49
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Restructured loans	8,263
Balance 90 days past due at any time during previous 12 months	$ 541

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)Securities	Dec. 31, 2014USD ($)Securities	Sep. 30, 2014USD ($)	Dec. 31, 2013USD ($)
Investment [Line Items]
Non-marketable FHLB and FRB stock held for debt and regulatory purposes	$ 46,800	$ 46,600
Non-marketable private equity investments held	69,500	60,200
U.S. Treasury inflation-protected securities held	$ 420,300
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 102,800	123,900
Credit-related portion of impairments included in earnings, for securities on watch list	$ 14,144	$ 13,734	$ 13,750	$ 12,499
Number of individual securities held in the available for sale portfolio | Securities	2,000
Securities in Unrealized Loss Positions, Number of Positions | Securities	332	363
Fair value of securities in an unrealized loss position	$ 2,521,993	$ 3,262,858
AFS securities in loss position at period-end, change in unrealized loss	5,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 29,918	35,384
Minimum period that OTTI securities have been in a loss position	12 months
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 789,751	1,137,135
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Percent of Portfolio	8.30%
Securities pledged as collateral	$ 4,300,000
Securities pledged as collateral and may be sold or re-pledged	$ 364,100
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	$ 93,200
Fair value of securities in an unrealized loss position	230,648	388,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	6,493	8,354
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	110,550	215,702
Unrealized losses included in auction rate securities held	5,500
Unrealized losses included in other state and municipal obligations held	1,000
Aggregate fair value of state and municipal obligations excluding auction rate securities	$ 1,800,000
State and municipal obligation portfolio, excluding auction rate securities, as a percentage of total available for sale securities	18.50%
Equity Securities [Member]
Investment [Line Items]
Common stock held by the holding company	$ 39,400
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Fair value of securities on other-than-temporary impairment watch list	47,400
Credit-related portion of impairments included in earnings, for securities on watch list	14,100
Fair value of securities in an unrealized loss position	253,640	185,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	648	1,228
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 53,765	$ 43,659

Investment Securities (Investme

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment Securities [Abstract]
Available for sale securities	$ 9,472,959	$ 9,523,560
Trading securities	14,463	15,357
Non-marketable	116,634	106,875
Total investment securities	$ 9,604,056	$ 9,645,792

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 9,331,750	$ 9,386,302
Fair Value	9,472,959	9,523,560
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	420,702	497,336
Fair Value	420,399	501,407
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	59,884
Fair Value	60,116
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	163,996
Fair Value	167,780
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	143,940
Fair Value	144,161
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	52,882
Fair Value	48,342
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Amortized Cost	857,149	968,574
Fair Value	862,209	963,127
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	42,108
Fair Value	42,249
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	477,115
Fair Value	482,232
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	332,296
Fair Value	332,248
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	5,630
Fair Value	5,480
State And Municipal Obligations [Member]
Investment [Line Items]
Amortized Cost	1,820,236	1,789,215
Fair Value	1,847,159	1,813,201
State And Municipal Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	99,618
Fair Value	99,985
State And Municipal Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	667,923
Fair Value	685,757
State And Municipal Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	912,614
Fair Value	924,070
State And Municipal Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	140,081
Fair Value	137,347
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	2,508,870	2,523,377
Fair Value	2,575,835	2,593,708
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	805,560	372,911
Fair Value	817,197	382,744
Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	2,585,088	3,090,174
Fair Value	2,584,688	3,091,993
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	5,899,518	5,986,462
Fair Value	5,977,720	6,068,445
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	328,468	140,784
Fair Value	326,008	139,161
Other Debt Securities [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	3,999
Fair Value	4,048
Other Debt Securities [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	83,398
Fair Value	83,613
Other Debt Securities [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	229,071
Fair Value	226,599
Other Debt Securities [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	12,000
Fair Value	11,748
Equity Securities [Member]
Investment [Line Items]
Amortized Cost	5,677	3,931
Fair Value	$ 39,464	$ 38,219

Investment Securities (Availabl

Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 9,331,750	$ 9,386,302
Gross unreailzed gain in accumulated other comprehensive income at period end	171,127	172,642
Gross unreailzed losses in accumulated other comprehensive income at period end	(29,918)	(35,384)
Fair Value	9,472,959	9,523,560
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	420,702	497,336
Gross unreailzed gain in accumulated other comprehensive income at period end	5,930	9,095
Gross unreailzed losses in accumulated other comprehensive income at period end	(6,233)	(5,024)
Fair Value	420,399	501,407
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Amortized Cost	857,149	968,574
Gross unreailzed gain in accumulated other comprehensive income at period end	7,809	2,593
Gross unreailzed losses in accumulated other comprehensive income at period end	(2,749)	(8,040)
Fair Value	862,209	963,127
State And Municipal Obligations [Member]
Investment [Line Items]
Amortized Cost	1,820,236	1,789,215
Gross unreailzed gain in accumulated other comprehensive income at period end	33,416	32,340
Gross unreailzed losses in accumulated other comprehensive income at period end	(6,493)	(8,354)
Fair Value	1,847,159	1,813,201
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	2,508,870	2,523,377
Gross unreailzed gain in accumulated other comprehensive income at period end	69,477	75,923
Gross unreailzed losses in accumulated other comprehensive income at period end	(2,512)	(5,592)
Fair Value	2,575,835	2,593,708
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	805,560	372,911
Gross unreailzed gain in accumulated other comprehensive income at period end	12,285	11,061
Gross unreailzed losses in accumulated other comprehensive income at period end	(648)	(1,228)
Fair Value	817,197	382,744
Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	2,585,088	3,090,174
Gross unreailzed gain in accumulated other comprehensive income at period end	7,444	6,922
Gross unreailzed losses in accumulated other comprehensive income at period end	(7,844)	(5,103)
Fair Value	2,584,688	3,091,993
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	5,899,518	5,986,462
Gross unreailzed gain in accumulated other comprehensive income at period end	89,206	93,906
Gross unreailzed losses in accumulated other comprehensive income at period end	(11,004)	(11,923)
Fair Value	5,977,720	6,068,445
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	328,468	140,784
Gross unreailzed gain in accumulated other comprehensive income at period end	979	420
Gross unreailzed losses in accumulated other comprehensive income at period end	(3,439)	(2,043)
Fair Value	326,008	139,161
Equity Securities [Member]
Investment [Line Items]
Amortized Cost	5,677	3,931
Gross unreailzed gain in accumulated other comprehensive income at period end	33,787	34,288
Gross unreailzed losses in accumulated other comprehensive income at period end	0	0
Fair Value	$ 39,464	$ 38,219

Investment Securities (Cash Flo

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Sep. 30, 2015
Minimum [Member]
Investment [Line Items]
Prepayment CPR	1.00%
Projected cumulative default	17.00%
Credit support	0.00%
Loss severity	20.00%
Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	54.00%
Credit support	22.00%
Loss severity	63.00%

Investment Securities (Changes

Investment Securities (Changes In Recorded Credit Losses) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
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	$ 14,144	$ 13,750	$ 13,734	$ 12,499
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	76	0
Credit losses on debt securities for which impairment was previously recognized	407	1,348
Increase in expected cash flows that are recognized over remaining life of security	$ (73)	$ (97)

Investment Securities (Securiti

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Less than 12 months, Fair Value	$ 1,732,242	$ 2,125,723
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	11,113	5,488
12 months or longer, Fair Value	789,751	1,137,135
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18,805	29,896
Total, Fair Value	2,521,993	3,262,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	29,918	35,384
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	158,390	90,261
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,701	818
12 months or longer, Fair Value	31,479	32,077
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,532	4,206
Total, Fair Value	189,869	122,338
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	6,233	5,024
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	11,419	224,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	57	922
12 months or longer, Fair Value	110,123	224,779
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,692	7,118
Total, Fair Value	121,542	449,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,749	8,040
State And Municipal Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	120,098	172,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	703	646
12 months or longer, Fair Value	110,550	215,702
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5,790	7,708
Total, Fair Value	230,648	388,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	6,493	8,354
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	64,863	55,128
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	259	429
12 months or longer, Fair Value	305,767	381,617
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,253	5,163
Total, Fair Value	370,630	436,745
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,512	5,592
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	199,875	141,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	361	609
12 months or longer, Fair Value	53,765	43,659
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	287	619
Total, Fair Value	253,640	185,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	648	1,228
Asset-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	998,031	1,424,457
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,542	2,009
12 months or longer, Fair Value	152,502	159,098
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,302	3,094
Total, Fair Value	1,150,533	1,583,555
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,844	5,103
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	1,262,769	1,621,240
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,162	3,047
12 months or longer, Fair Value	512,034	584,374
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,842	8,876
Total, Fair Value	1,774,803	2,205,614
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	11,004	11,923
Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	179,566	16,434
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,490	55
12 months or longer, Fair Value	25,565	80,203
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	949	1,988
Total, Fair Value	205,131	96,637
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 3,439	$ 2,043

Investment Securities (State An

Investment Securities (State And Municipal Obligations, By State And Economic Sector) (Details)	9 Months Ended
	Sep. 30, 2015yr
Sector Classification, Texas [Member]
Investment [Line Items]
% of Portfolio	12.10%
Average Life (in years)	6.1
Average Rating (Moody's)	Aa2
Sector Classification, Florida [Member]
Investment [Line Items]
% of Portfolio	7.00%
Average Life (in years)	4.5
Average Rating (Moody's)	Aa3
Sector Classification New York [Member]
Investment [Line Items]
% of Portfolio	6.90%
Average Life (in years)	6.8
Average Rating (Moody's)	Aa2
Sector Classification Ohio [Member]
Investment [Line Items]
% of Portfolio	6.70%
Average Life (in years)	6.1
Average Rating (Moody's)	Aa2
Sector Classification, Washington [Member]
Investment [Line Items]
% of Portfolio	5.40%
Average Life (in years)	5.7
Average Rating (Moody's)	Aa2
Sector Classification, General Obligation [Member]
Investment [Line Items]
% of Portfolio	37.70%
Average Life (in years)	5.6
Average Rating (Moody's)	Aa2
Sector Classification, Lease [Member]
Investment [Line Items]
% of Portfolio	18.90%
Average Life (in years)	5.5
Average Rating (Moody's)	Aa2
Sector Classification, Transportation [Member]
Investment [Line Items]
% of Portfolio	12.90%
Average Life (in years)	4.7
Average Rating (Moody's)	A1
Sector Classification Housing [Member]
Investment [Line Items]
% of Portfolio	12.90%
Average Life (in years)	6.4
Average Rating (Moody's)	Aa1
Sector Classification, Limited Tax [Member]
Investment [Line Items]
% of Portfolio	8.90%
Average Life (in years)	6.5
Average Rating (Moody's)	Aa2

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		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Investment [Line Items]
Proceeds from sales of available for sale securities				$ 675,870		$ 30,998
Proceeds from sales of non-marketable securities				9,023		33,043
Total proceeds	[1]			684,893		64,041
Investment securities gains (losses), net		$ (378)	$ 2,995	7,800	[1]	10,474	[1]
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale Securities, gross realized gains on sales				2,813		0
Available-for-sale Securities, gross realized loss on sales				0		(5,197)
Gain realized on donation				0		1,570
Other-than-temporary impairment recognized on debt securities				(483)		(1,348)
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales				2,516		1,613
Losses realized on sales				0		(134)
Fair value adjustments, net				$ 2,954		$ 13,970
[1]	Available for sale and non-marketable securities

Goodwill And Other Intangible58

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 445	$ 499	$ 1,400	$ 1,600

Goodwill And Other Intangible59

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 35,670	$ 34,963
Accumulated Amortization	(28,806)	(27,416)
Valuation Allowance	(38)	(97)
Net Amount	6,826	7,450
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(25,905)	(24,698)
Valuation Allowance	0	0
Net Amount	5,365	6,572
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,400	3,693
Accumulated Amortization	(2,901)	(2,718)
Valuation Allowance	(38)	(97)
Net Amount	$ 1,461	$ 878

Goodwill And Other Intangible60

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Sep. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,015	$ 1,753
2,016	1,374
2,017	1,033
2,018	786
2,019	$ 649

Goodwill And Other Intangible61

Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets [Roll Forward]
Amortization	$ (445)	$ (499)	$ (1,400)	$ (1,600)
Goodwill [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			0
Amortization			0
Impairment reversal			0
Intangible Assets, Net (Including Goodwill)	138,921		138,921		$ 138,921
Core Deposit Premium [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			0
Amortization			(1,207)
Impairment reversal			0
Intangible Assets, Net (Including Goodwill)	5,365		5,365		6,572
Mortgage Servicing Rights [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			707
Amortization			(183)
Impairment reversal			59
Intangible Assets, Net (Including Goodwill)	$ 1,461		$ 1,461		$ 878

Goodwill And Other Intangible62

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 138,921	$ 138,921
Consumer Segment [Member]
Goodwill [Line Items]
Goodwill	70,721	70,721
Commercial Segment [Member]
Goodwill [Line Items]
Goodwill	67,454	67,454
Wealth Segment [Member]
Goodwill [Line Items]
Goodwill	$ 746	$ 746

Guarantees (Details)

Guarantees (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Derivative Liabilities	$ (16,251)	$ (10,948)
Notional amount of underlying interest rate swaps associated with risk participation agreements	1,062,402	$ 797,030
Financial Standby Letter Of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit, net liability	2,600
Contractual amount of letters of credit, guaranteed maximum potential future payments	335,000
Risk Participation Agreement [Member] | Indirect Guarantee Of Indebtedness [Member]
Guarantor Obligations [Line Items]
Derivative Liabilities	(234)
Notional amount of underlying interest rate swaps associated with risk participation agreements	$ 66,800
Minimum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	3 years
Maximum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	11 years

Pension Pension (Narrative) (De

Pension Pension (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015USD ($)
Pension (Narrative) [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 0
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0

Pension (Net Pension Cost) (Det

Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension [Abstract]
Service cost - benefits earned during the period	$ 127	$ 133	$ 379	$ 399
Interest cost on projected benefit obligation	1,139	1,262	3,571	3,785
Expected Return on Plan Assets	(1,523)	(1,561)	(4,569)	(4,683)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(203)	0	(203)	0
Amortization of unrecognized net loss	660	359	1,969	1,079
Net periodic pension cost	$ 200	$ 193	$ 1,147	$ 580

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 64,612	$ 68,185	$ 200,020	$ 199,029
Preferred Stock Dividends	2,250	1,800	6,750	1,800
Net Income (Loss) Available to Common Stockholders	$ 62,362	$ 66,385	$ 193,270	$ 197,229
Basic income per common share	$ 0.67	$ 0.69	$ 2.03	$ 2
Diluted income per common share	$ 0.66	$ 0.69	$ 2.02	$ 1.99
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.	$ 64,612	$ 68,185	$ 200,020	$ 199,029
Preferred Stock Dividends	2,250	1,800	6,750	1,800
Net Income (Loss) Available to Common Stockholders	62,362	66,385	193,270	197,229
Less income allocated to nonvested restricted stockholders	884	879	2,677	2,537
Net income available to common stockholders	$ 61,478	$ 65,506	$ 190,593	$ 194,692
Weighted average common shares outstanding	91,989	95,104	93,874	97,591
Basic income per common share	$ 0.67	$ 0.69	$ 2.03	$ 2
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	$ 62,362	$ 66,385	$ 193,270	$ 197,229
Less income allocated to nonvested restricted stockholders	883	877	2,672	2,530
Net income available to common stockholders	$ 61,479	$ 65,508	$ 190,598	$ 194,699
Weighted average common shares outstanding	91,989	95,104	93,874	97,591
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	280	412	300	419
Weighted average diluted common shares outstanding	92,269	95,516	94,174	98,010
Diluted income per common share	$ 0.66	$ 0.69	$ 2.02	$ 1.99

Common Stock Common Stock (Anti

Common Stock Common Stock (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	377	152

Common Stock Common Stock (Pref

Common Stock Common Stock (Preferred Stock Issuance) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 19, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Common Stock (Preferred Stock) [Abstract]
Depositary shares issued	6,000,000
Preferred stock, shares issued	6,000	6,000		6,000
Preferred stock, par value	$ 1	$ 0		$ 1
Preferred Stock, Liquidation Preference, Value	$ 150,000
Preferred Stock, Liquidation Preference Per Share	$ 25
Proceeds from issuance of preferred stock	$ 144,800	$ 0	$ 144,784

Common Stock Common Stock (Acce

Common Stock Common Stock (Accelerated Share Repurchase) (Details) - USD ($) $ in Millions	Aug. 27, 2015	Jun. 24, 2015	May. 21, 2015	Jun. 20, 2014
Common Stock (Accelerated Share Repurchase) [Abstract]
Accelerated Share Repurchase Program Repurchase Amount			$ 100	$ 200
Shares received under accelerated share repurchase program	351,620	1,480,378	1,803,427	3,208,206

Accumulated Other Comprehensi70

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income		$ 65,636	$ 60,231	$ 65,636		$ 60,231	$ 62,093	$ 9,731
Other Comprehensive Income Before Reclassifications				6,279		75,397
Reclassified from Accumulated Oher Comprehensive Income				(564)		6,054
Other Comprehensive Income (Loss), before Tax				5,715		81,451
Other Comprehensive Income (Loss), Tax				(2,172)		(30,951)
Other comprehensive income (loss), net of tax		16,847	(24,083)	3,543		50,500
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				0		0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated other comprehensive income	[1]	3,528	4,067	3,528		4,067	3,791	4,203
Other Comprehensive Income Before Reclassifications	[1]			(976)		(1,568)
Reclassified from Accumulated Oher Comprehensive Income	[1]			483		1,348
Other Comprehensive Income (Loss), before Tax	[1]			(493)		(220)
Other Comprehensive Income (Loss), Tax	[1]			187		84
Other comprehensive income (loss), net of tax	[1]			(306)		(136)
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				43	[1]	0
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income	[1]	84,021	71,270	84,021		71,270	81,310	21,303
Other Comprehensive Income Before Reclassifications	[1]			7,255		76,965
Reclassified from Accumulated Oher Comprehensive Income	[1]			(2,813)		3,627
Other Comprehensive Income (Loss), before Tax	[1]			4,442		80,592
Other Comprehensive Income (Loss), Tax	[1]			(1,688)		(30,625)
Other comprehensive income (loss), net of tax	[1]			2,754		49,967
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				(43)	[1]	0
Pension Loss [Member]
Accumulated other comprehensive income	[2]	$ (21,913)	$ (15,106)	(21,913)		(15,106)	$ (23,008)	$ (15,775)
Other Comprehensive Income Before Reclassifications	[2]			0		0
Reclassified from Accumulated Oher Comprehensive Income	[2]			1,766		1,079
Other Comprehensive Income (Loss), before Tax	[2]			1,766		1,079
Other Comprehensive Income (Loss), Tax	[2]			(671)		(410)
Other comprehensive income (loss), net of tax	[2]			1,095		669
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				$ 0	[2]	$ 0
[1]	The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.
[2]	The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of unrecognized net loss" (see Note 6), for inclusion in the consolidated statements of income.

Segments Segments (Narrative) (

Segments Segments (Narrative) (Details) $ in Millions	Jan. 01, 2015USD ($)
Segments (Narrative) [Abstract]
Mortgage Loans on Real Estate transferred from Consumer segment to Other/Elimination	$ 340

Segments (Schedule Of Financial

Segments (Schedule Of Financial Information By Segment) (Details)	3 Months Ended		9 Months Ended				12 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)		Sep. 30, 2014USD ($)		Dec. 31, 2014
Segment Reporting Information [Line Items]
Segment Reporting Information, Intersegment Revenue	$ 0	$ 0	$ 0		$ 0
Number of operating segments			3				3
Net interest income	162,038,000	154,716,000	$ 471,833,000		468,275,000
Provision for loan losses	(8,364,000)	(7,652,000)	(19,541,000)		(24,867,000)
Non-interest income	111,148,000	112,286,000	331,666,000		323,676,000
Investment securities gains (losses), net	(378,000)	2,995,000	7,800,000	[1]	10,474,000	[1]
Non-interest expense	(171,262,000)	(161,840,000)	(500,279,000)		(486,355,000)
Income before income taxes	93,182,000	100,505,000	291,479,000		291,203,000
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	67,083,000	66,565,000	199,265,000		198,533,000
Provision for loan losses	(8,605,000)	(8,306,000)	(25,500,000)		(25,816,000)
Non-interest income	30,809,000	29,699,000	87,409,000		84,331,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(69,196,000)	(65,900,000)	(203,446,000)		(197,220,000)
Income before income taxes	20,091,000	22,058,000	57,728,000		59,828,000
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	74,008,000	72,019,000	218,386,000		214,406,000
Provision for loan losses	166,000	863,000	842,000		803,000
Non-interest income	47,485,000	47,689,000	144,684,000		142,326,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(68,710,000)	(63,542,000)	(199,027,000)		(188,223,000)
Income before income taxes	52,949,000	57,029,000	164,885,000		169,312,000
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	10,391,000	9,811,000	31,921,000		29,713,000
Provision for loan losses	106,000	(29,000)	114,000		463,000
Non-interest income	34,042,000	33,368,000	102,336,000		94,870,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(27,211,000)	(23,833,000)	(81,498,000)		(72,606,000)
Income before income taxes	17,328,000	19,317,000	52,873,000		52,440,000
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	151,482,000	148,395,000	449,572,000		442,652,000
Provision for loan losses	(8,333,000)	(7,472,000)	(24,544,000)		(24,550,000)
Non-interest income	112,336,000	110,756,000	334,429,000		321,527,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(165,117,000)	(153,275,000)	(483,971,000)		(458,049,000)
Income before income taxes	90,368,000	98,404,000	275,486,000		281,580,000
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	10,556,000	6,321,000	22,261,000		25,623,000
Provision for loan losses	(31,000)	(180,000)	5,003,000		(317,000)
Non-interest income	(1,188,000)	1,530,000	(2,763,000)		2,149,000
Investment securities gains (losses), net	(378,000)	2,995,000	7,800,000		10,474,000
Non-interest expense	(6,145,000)	(8,565,000)	(16,308,000)		(28,306,000)
Income before income taxes	$ 2,814,000	$ 2,101,000	$ 15,993,000		$ 9,623,000
[1]	Available for sale and non-marketable securities

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,062,402	$ 797,030
Education [Member]
Derivative [Line Items]
Derivative loss from industry concentration	1,500
Real Estate [Member]
Derivative [Line Items]
Derivative loss from industry concentration	7,100
Distribution [Member]
Derivative [Line Items]
Derivative loss from industry concentration	2,000
Swaps with Central Clearing Agency [Member]
Derivative [Line Items]
Swap Net Liability Position Fair Value	15,700
Cash [Member] | Swaps with Central Clearing Agency [Member]
Derivative [Line Items]
Value Of Collateral Posted	16,800
Investment Securities [Member] | Swaps with Central Clearing Agency [Member]
Derivative [Line Items]
Value Of Collateral Posted	$ 3,300

Derivative Instruments (Schedul

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,062,402	$ 797,030
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	906,559	647,709
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	41,603	53,587
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	70,736	75,943
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	17,751	19,791
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	12,473	0
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,280	0
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 12,000	$ 0

Derivative Instruments (Sched75

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Other assets	$ 16,369	$ 10,457
Other liabilities	(16,251)	(10,948)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	15,681	10,144
Other liabilities	(15,681)	(10,166)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	16	62
Other liabilities	(16)	(62)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	2	3
Other liabilities	(234)	(226)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	219	248
Other liabilities	(197)	(494)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	451	0
Other liabilities	0	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	(5)	0
Not Designated as Hedging Instrument [Member] | Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	$ (118)	$ 0

Derivative Instruments (Summary

Derivative Instruments (Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 359	$ 380	$ 4,270	$ 1,347
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	741	212	3,551	1,023
Other Non-Interest Income [Member] | Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	0	13	0	13
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(57)	(21)	(9)	177
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(55)	176	267	134
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	106	0	451	0
Loans Fees And Sales [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(6)	0	(5)	0
Loans Fees And Sales [Member] | Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (370)	$ 0	$ 15	$ 0

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative Asset, Amount Offset by Liabiilty	$ 0	$ 0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	16,369	10,457
Derivative Assets	16,369	10,457
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	16,251	10,948
Derivative Liabilities	16,251	10,948
Derivative Subject to Master Netting Agreement [Member]
Derivative Asset, Fair Value, Gross Asset	15,700	10,209
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Net Amount Presented in the Balance Sheet	15,700	10,209
Derivative Asset, Not Offset, Policy Election Deduction	(16)	(251)
derivatve asset, fair value of collateral	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	15,684	9,958
Derivative Liability, Fair Value, Gross Liability	16,052	10,454
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Net Amount Presented in the Balance Sheet	16,052	10,454
Derivative Liability, Not Offset, Policy Election Deduction	(16)	(251)
Derivative Liability, Fair Value of Collateral	(14,456)	(8,738)
Derivative Liability, Fair Value, Amount Offset Against Collateral	1,580	1,465
Derivative Not Subject to Master Netting Agreement [Member]
Derivative Asset, Fair Value, Gross Asset	669	248
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	669	248
Derivative Liability, Fair Value, Gross Liability	199	494
Derivative Liability, Amount Offset by Asset	0	0
Derivative, Fair Value, Net	$ 199	$ 494

Resale and Repurchase Agreeme78

Resale and Repurchase Agreements Resale and Repurchase Agreements (Narrative) (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Balance Sheet Offsetting [Line Items]
Collateral Swap Agreements	$ 350	$ 450
Collateral Already Posted, Aggregate Fair Value	360.8
Collateral Accepted, Aggregate Fair Value	$ 373.2

Resale and Repurchase Agreeme79

Resale and Repurchase Agreements Resale and Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Balance Sheet Offsetting [Line Items]
Securities purchased under agreements to resell	$ 975,000	$ 1,050,000
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	1,325,000	1,500,000
Securities Purchased under Agreements to Resell, Liability	(350,000)	(450,000)
Securities purchased under agreements to resell	975,000	1,050,000
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(975,000)	(1,049,370)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	630
Repurchase agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	1,981,497	2,308,678
Securities Sold under Agreements to Repurchase, Asset	(350,000)	(450,000)
Securities Sold under Agreements to Repurchase	1,631,497	1,858,678
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,631,497)	(1,858,678)
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) $ in Thousands	Sep. 30, 2015USD ($)
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	$ 151,015
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	11,937
U.S. Government And Federal Agency Obligations [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0
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	162,952
Government-Sponsored Enterprise Obligations [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	361,228
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	3,298
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	17,928
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	382,454
Agency Mortgage-Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	335,300
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	93,104
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	232,072
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	660,476
Asset-Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	690,615
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	85,000
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
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	775,615
Repurchase Agreements [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	1,538,158
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	193,339
Repurchase Agreements [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	250,000
Repurchase Agreements [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 1,981,497

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 2.4	$ 2.2	$ 7.7	$ 6.6
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 Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 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)	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Nonvested Share Awards [Roll Forward]
Nonvested, Shares, Beginning Balance	1,259,689
Granted, Shares	215,245
Vested, Shares	(141,877)
Forfeited, Shares	(15,936)
Nonvested, Shares, Ending Balance	1,317,121
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 34.41
Granted , Weighted Average Grant Date Fair Value | $ / shares	41.69
Vested , Weighted Average Grant Date Fair Value | $ / shares	30.11
Forfeited , Weighted Average Grant Date Fair Value | $ / shares	34.79
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 36.05

Stock-Based Compensation Stock-

Stock-Based Compensation Stock-Based Compensation (Current Year Per Share Average Fair Value and Valuation Model Assumptions) (Details)	9 Months Ended
	Sep. 30, 2015$ / 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	$ 7.58
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	21.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years 2 months

Stock-Based Compensation (Sum84

Stock-Based Compensation (Summary Of SAR Activity) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares, Beginning Balance	1,780,578
Granted, Shares	240,267
Forfeited, Shares	(6,182)
Expired, Shares	(1,076)
Exercised, Shares	(411,126)
Outstanding, Shares, Ending Balance	1,602,461
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 33.96
Granted, Weighted Average Exercise Price | $ / shares	41.40
Forfeited, Weighted Average Exercise Price | $ / shares	39.04
Expired, Weighted Average Exercise Price | $ / shares	37.31
Exercised, Weighted Average Exercise Price | $ / shares	32.94
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 35.32
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 5 months
Outstanding, Aggregate Intrinsic Value, Ending Balance | $	$ 16,412

Stock-Based Compensation (Sum85

Stock-Based Compensation (Summary Of Option Activity) (Details)	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Stock Options [Roll Forward]
Outstanding, Shares, Beginning Balance	68,675
Granted, shares	0
Foreited, shares	0
Expired, Shares	0
Exercised, Shares	(68,675)
Outstanding, Shares, Ending Balance	0
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 29.27
Granted, Weighted Average Exercise Price | $ / shares	0
Forfeited, Weighted Average Exercise Price | $ / shares	0
Expired, Weighted Average Exercise Price | $ / shares	0
Exercised, Weighted Average Exercise Price | $ / shares	29.27
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments	$ 66,875	$ 57,581
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction Rate Securities Available For Sale	93,200
Private equity investments	$ 66,875	$ 57,581

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 2,173,000	$ 0
U.S. government and federal agency obligations	420,399,000	501,407,000
Government-sponsored enterprise obligations	862,209,000	963,127,000
State and municipal obligations	1,847,159,000	1,813,201,000
Agency mortgage-backed securities	2,575,835,000	2,593,708,000
Non-agency mortgage-backed securities	817,197,000	382,744,000
Other asset-backed securities	2,584,688,000	3,091,993,000
Other debt securities	326,008,000	139,161,000
Equity securities	39,464,000	38,219,000
Trading securities	14,463,000	15,357,000
Private equity investments	66,875,000	57,581,000
Derivative Assets	16,369,000	10,457,000
Assets held in trust	8,825,000	8,848,000
Total Assets	9,581,664,000	9,615,803,000
Derivative Liabilities	16,251,000	10,948,000
Total Liabilities	16,251,000	10,948,000
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	420,399,000	501,407,000
Government-sponsored enterprise obligations	0	0
State and municipal obligations	0	0
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Other asset-backed securities	0	0
Other debt securities	0	0
Equity securities	19,509,000	17,975,000
Trading securities	0	0
Private equity investments	0	0
Derivative Assets	0	0
Assets held in trust	8,825,000	8,848,000
Total Assets	448,733,000	528,230,000
Derivative Liabilities	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	2,173,000	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	862,209,000	963,127,000
State and municipal obligations	1,753,970,000	1,718,058,000
Agency mortgage-backed securities	2,575,835,000	2,593,708,000
Non-agency mortgage-backed securities	817,197,000	382,744,000
Other asset-backed securities	2,584,688,000	3,091,993,000
Other debt securities	326,008,000	139,161,000
Equity securities	19,955,000	20,244,000
Trading securities	14,463,000	15,357,000
Private equity investments	0	0
Derivative Assets	15,916,000	10,454,000
Assets held in trust	0	0
Total Assets	8,972,414,000	8,934,846,000
Derivative Liabilities	16,017,000	10,722,000
Total Liabilities	16,017,000	10,722,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	0	0
State and municipal obligations	93,189,000	95,143,000
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Other asset-backed securities	0	0
Other debt securities	0	0
Equity securities	0	0
Trading securities	0	0
Private equity investments	66,875,000	57,581,000
Derivative Assets	453,000	3,000
Assets held in trust	0	0
Total Assets	160,517,000	152,727,000
Derivative Liabilities	234,000	226,000
Total Liabilities	$ 234,000	$ 226,000

Fair Value Measurements (Summ88

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 151,836,000	$ 176,112,000	$ 152,501,000	$ 184,271,000
Total gains or losses (realized /unrealized), included in earnings	(1,172,000)	3,204,000	3,396,000	15,338,000
Total gains or losses (realized /unrealized), included in other comprehensive income	227,000	(921,000)	(127,000)	3,383,000
Investment securities called	0	0	(2,000,000)	0
Discount accretion	22,000	40,000	173,000	120,000
Purchase of private equity securities	9,370,000	4,575,000	11,023,000	11,575,000
Sales And Repayments Of Private Equity Securities	0	0	(4,800,000)	(31,423,000)
Capitalized interest/dividends	0	45,000	117,000	112,000
Purchase Of Risk Participation Agreement	0	41,000	0	41,000
Sale Of Risk Participation Agreement	0	0	0	(321,000)
Ending balance	160,283,000	183,096,000	160,283,000	183,096,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(827,000)	3,204,000	3,396,000	(3,059,000)
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	92,940,000	132,108,000	95,143,000	127,724,000
Total gains or losses (realized /unrealized), included in earnings	0	0	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	227,000	(921,000)	(127,000)	3,383,000
Investment securities called	0	0	(2,000,000)	0
Discount accretion	22,000	40,000	173,000	120,000
Purchase of private equity securities	0	0	0	0
Sales And Repayments Of Private Equity Securities	0	0	0	0
Capitalized interest/dividends	0	0	0	0
Purchase Of Risk Participation Agreement	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	93,189,000	131,227,000	93,189,000	131,227,000
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	0	0
Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	58,726,000	44,192,000	57,581,000	56,612,000
Total gains or losses (realized /unrealized), included in earnings	(1,221,000)	3,225,000	2,954,000	15,161,000
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0	0	0
Investment securities called	0	0	0	0
Discount accretion	0	0	0	0
Purchase of private equity securities	9,370,000	4,575,000	11,023,000	11,575,000
Sales And Repayments Of Private Equity Securities	0	0	(4,800,000)	(31,423,000)
Capitalized interest/dividends	0	45,000	117,000	112,000
Purchase Of Risk Participation Agreement	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	66,875,000	52,037,000	66,875,000	52,037,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(1,221,000)	3,225,000	2,954,000	(3,232,000)
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	170,000	(188,000)	(223,000)	(65,000)
Total gains or losses (realized /unrealized), included in earnings	49,000	(21,000)	442,000	177,000
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0	0	0
Investment securities called	0	0	0	0
Discount accretion	0	0	0	0
Purchase of private equity securities	0	0	0	0
Sales And Repayments Of Private Equity Securities	0	0	0	0
Capitalized interest/dividends	0	0	0	0
Purchase Of Risk Participation Agreement	0	41,000	0	41,000
Sale Of Risk Participation Agreement	0	0	0	(321,000)
Ending balance	219,000	(168,000)	219,000	(168,000)
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 394,000	$ (21,000)	$ 442,000	$ 173,000

Fair Value Measurements (Summ89

Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ (1,172)	$ 3,204	$ 3,396	$ 15,338
Change in unrealized gains or losses relating to assets still held	(827)	3,204	3,396	(3,059)
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	106	0	451	0
Change in unrealized gains or losses relating to assets still held	451	0	451	0
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	(57)	(21)	(9)	177
Change in unrealized gains or losses relating to assets still held	(57)	(21)	(9)	173
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	(1,221)	3,225	2,954	15,161
Change in unrealized gains or losses relating to assets still held	$ (1,221)	$ 3,225	$ 2,954	$ (3,232)

Fair Value Measurements (Summ90

Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details)	9 Months Ended
	Sep. 30, 2015Rate
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Auction Rate Securities [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input, Estimated market recovery period	3 years
Unobservable Input, Estimated market rate	2.30%
Auction Rate Securities [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input, Estimated market recovery period	5 years
Unobservable Input, Estimated market rate	7.10%
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	5.5
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	82.40%
Weighted Average, Embedded Servicing Value	1.00%
Mortgage Loan Commitments [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	60.50%
Embedded Servicing Value	0.90%
Mortgage Loan Commitments [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	100.00%
Embedded Servicing Value	1.00%

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 6,860	$ 17,015
Private Equity Investments Nonrecurring Basis	0	1,309
Mortgage servicing rights	1,461	777
Foreclosed assets	479	850
Long-lived assets	937	8,528
Fair Value, Inputs, Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Private Equity Investments Nonrecurring Basis	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long-lived assets	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Private Equity Investments Nonrecurring Basis	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long-lived assets	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	6,860	17,015
Private Equity Investments Nonrecurring Basis	0	1,309
Mortgage servicing rights	1,461	777
Foreclosed assets	479	850
Long-lived assets	937	8,528
Gain (Loss) on Investments [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Loans Nonrecurring Basis Gains Losses	(1,794)	(2,797)
Private Equity Investments Nonrecurring Basis Gains Losses	0	(1,191)
Mortgage Servicing Rights Nonrecurring Basis Gains Losses	59	13
Foreclosed Assets Nonrecurring Basis Gains Losses	(193)	(275)
Long Lived Assets Nonrecurring Basis Gains Losses	$ (1,366)	$ (1,890)

Fair Value Of Financial Instr92

Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Personal Real Estate Loans Held for Sale	$ 2,200
Available for sale securities	9,472,959	$ 9,523,560
Trading securities	14,463	15,357
Non-marketable	116,634	106,875
Securities purchased under agreements to resell	975,000	1,050,000
Cash and due from banks	384,122	467,488
Derivative Assets	16,369	10,457
Non-interest bearing deposits	6,699,873	6,811,959
Savings, interest checking and money market deposits	10,295,260	10,541,601
Derivative Liabilities	16,251	10,948
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Derivative Assets	0	0
Derivative Liabilities	0	0
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	14,463	15,357
Derivative Assets	15,916	10,454
Derivative Liabilities	16,017	10,722
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Derivative Assets	453	3
Derivative Liabilities	234	226
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	439,908	519,382
Federal funds sold	32,550	32,485
Interest earning deposits with banks	42,078	600,744
Cash and due from banks	384,122	467,488
Non-interest bearing deposits	6,699,873	6,811,959
Savings, interest checking and money market deposits	10,295,260	10,541,601
Federal Funds Purchased	561,700	3,840
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Personal Real Estate Loans Held for Sale	4,143	0
Available for sale securities	8,939,862	8,909,035
Trading securities	14,463	15,357
Derivative Assets	15,916	10,454
Derivative Liabilities	16,017	10,722
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	93,189	95,143
Non-marketable	116,634	106,875
Securities purchased under agreements to resell	975,000	1,050,000
Derivative Assets	453	3
Time open and certificates of deposits	1,991,627	2,122,218
Securities Sold under Agreements to Repurchase	1,631,497	1,858,678
Other borrowings	103,831	104,058
Derivative Liabilities	234	226
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,406,854	3,969,952
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	534,425	403,507
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,286,013	2,288,215
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,920,650	1,883,092
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,886,806	1,705,134
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	428,940	430,873
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	756,093	782,370
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,493	6,095
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	439,908	519,382
Federal funds sold	32,550	32,485
Interest earning deposits with banks	42,078	600,744
Cash and due from banks	384,122	467,488
Non-interest bearing deposits	6,699,873	6,811,959
Savings, interest checking and money market deposits	10,295,260	10,541,601
Federal Funds Purchased	561,700	3,840
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Personal Real Estate Loans Held for Sale	4,143	0
Available for sale securities	8,939,862	8,909,035
Trading securities	14,463	15,357
Derivative Assets	15,916	10,454
Derivative Liabilities	16,017	10,722
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	93,189	95,143
Non-marketable	116,634	106,875
Securities purchased under agreements to resell	978,480	1,048,866
Derivative Assets	453	3
Time open and certificates of deposits	1,991,741	2,121,114
Securities Sold under Agreements to Repurchase	1,631,562	1,858,731
Other borrowings	109,939	111,102
Derivative Liabilities	234	226
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,438,854	3,982,531
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	541,912	407,905
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,327,496	2,315,378
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,968,453	1,933,456
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,885,963	1,701,037
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	431,324	433,508
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	769,878	794,929
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 4,493	$ 6,095