Commerce Bancshares (CBSH) 10-Q 6 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document And Entity Information [Abstract]
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Type	10-Q
Amendment Flag	false
Document Fiscal Period Focus	Q2
Entity Registrant Name	COMMERCE BANCSHARES INC /MO/
Current Fiscal Year End Date	--12-31
Entity Central Index Key	22,356
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		106,616,850

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Loans	$ 13,954,111	$ 13,983,674
Allowance for loan losses	(159,532)	(159,532)
Net loans	13,794,579	13,824,142
Loans held for sale	20,352	21,398
Investment securities:
Available-for-sale Securities, Debt Securities	8,412,376	8,725,442
Trading	31,156	18,269
Equity securities	4,444	50,591
Other securities	112,309	99,005
Total investment securities	8,560,285	8,893,307
Federal funds sold and short-term securities purchased under agreements to resell	31,500	42,775
Long-term securities purchased under agreements to resell	700,000	700,000
Interest earning deposits with banks	114,947	30,631
Cash and due from banks	386,339	438,439
Land, buildings and equipment, net	331,782	335,110
Goodwill	138,921	138,921
Other intangible assets, net	8,083	7,618
Other assets	437,954	401,074
Total assets	24,524,742	24,833,415
Deposits:
Non-interest bearing	6,876,756	7,158,962
Savings, interest checking and money market	11,761,832	11,499,620
Time open and C.D.'s of less than $100,000	603,629	634,646
Time open and C.D.'s, $100,000 or More	1,079,340	1,132,218
Total deposits	20,321,557	20,425,446
Federal funds purchased and securities sold under agreements to repurchase	1,166,759	1,507,138
Other Borrowings	9,291	1,758
Other liabilities	255,752	180,889
Total liabilities	21,753,359	22,115,231
Commerce Bancshares, Inc. stockholders' equity:
Preferred stock	144,784	144,784
Common stock	535,407	535,407
Capital surplus	1,804,057	1,815,360
Retained earnings	408,374	221,374
Treasury stock, at cost	(15,854)	(14,473)
Accumulated other comprehensive income	(108,781)	14,108
Total Commerce Bancshares, Inc. stockholders' equity	2,767,987	2,716,560
Non-controlling interest	3,396	1,624
Total equity	2,771,383	2,718,184
Total liabilities and equity	$ 24,524,742	$ 24,833,415

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 10,750,000	$ 15,327,000
Investment Securities:
Available-for-sale Securities Pledged as Collateral	$ 557,698,000	$ 662,515,000
Stockholders' Equity:
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	6,000	6,000
Common stock, par value	$ 5	$ 5
Common Stock, Shares Authorized	120,000,000	120,000,000
Common stock, shares issued	107,081,397	107,081,397
Treasury stock, shares	275,577	276,968

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
INTEREST INCOME
Interest and fees on loans	$ 154,135	$ 134,273	$ 301,150		$ 262,596
Interest and fees on loans held for sale	372	263	676		459
Interest on investment securities	65,564	54,975	118,806		110,240
Interest on federal funds sold and short-term securities purchased under agreements to resell	177	37	357		60
Interest on long-term securities purchased under agreements to resell	3,785	3,684	7,899		7,477
Interest on deposits with banks	1,590	362	2,730		759
Total interest income	225,623	193,594	431,618		381,591
INTEREST EXPENSE
Savings, interest checking and money market	6,519	4,342	12,108		8,232
Time open and C.D.'s of less than $100,000	694	674	1,356		1,318
Time open and C.D.'s of $100,000 and over	3,483	2,822	6,322		5,585
Interest on federal funds purchased and securities sold under agreements to repurchase	3,956	2,038	7,957		3,577
Interest on other borrowings	12	911	24		1,799
Total interest expense	14,664	10,787	27,767		20,511
Net interest income	210,959	182,807	403,851		361,080
Provision for loan losses	10,043	10,758	20,439		21,886
Net interest income after provision for loan losses	200,916	172,049	383,412		339,194
NON-INTEREST INCOME
Bank card transaction fees	43,215	37,295	84,668		73,046
Trust fees	37,036	33,120	73,098		65,134
Deposit account charges and other fees	23,893	22,861	46,875		44,803
Capital market fees	1,992	2,156	4,283		4,498
Consumer brokerage services	3,971	3,726	7,739		7,375
Loan fees and sales	3,229	4,091	6,091		7,259
Other	11,514	12,131	21,786		22,878
Total non-interest income	124,850	115,380	244,540		224,993
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	(3,075)	1,651	2,335	[1]	879	[1]
NON-INTEREST EXPENSE
Salaries and employee benefits	115,589	108,829	231,483		221,198
Net occupancy	11,118	11,430	22,702		22,873
Equipment	4,594	4,776	9,025		9,385
Supplies and communication	5,126	5,446	10,439		11,155
Data processing and software	21,016	20,035	41,706		39,940
Marketing	5,142	4,488	9,947		7,712
Deposit insurance	3,126	3,592	6,583		7,063
Community Service	656	2,916	1,385		5,860
Other	15,493	15,378	30,867		31,081
Total non-interest expense	181,860	176,890	364,137		356,267
Income before income taxes	140,831	112,190	266,150		208,799
Less income taxes	29,507	33,201	52,765		58,108
Net income	111,324	78,989	213,385		150,691
Less non-controlling interest expense (income)	994	29	2,071		227
Net income attributable to Commerce Bancshares, Inc.	110,330	78,960	211,314		150,464
Preferred Stock Dividends	2,250	2,250	4,500		4,500
Net Income (Loss) Available to Common Stockholders	$ 108,080	$ 76,710	$ 206,814		$ 145,964
Net income per common share - basic	$ 1.02	$ 0.71	$ 1.94		$ 1.36
Net income per common share - diluted	$ 1.01	$ 0.71	$ 1.93		$ 1.36
[1]	Available for sale and non-marketable securities

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 111,324	$ 78,989	$ 213,385	$ 150,691
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	(123)	76	(78)	171
Net unrealized gains (losses) on other securities	(19,489)	11,241	(93,210)	30,243
Pension loss amortization	394	341	787	681
Other comprehensive income (loss), net of tax	(19,218)	11,658	(92,501)	31,095
Comprehensive income	92,106	90,647	120,884	181,786
Non-controlling interest expense (income)	994	29	2,071	227
Comprehensive income attributable to Commerce Bancshares, Inc	$ 91,112	$ 90,618	$ 118,813	$ 181,559

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-Controlling Interest [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member]	$ 1,297			$ 3,441	$ (2,144)
Balance at Dec. 31, 2016	2,501,132	$ 144,784	$ 510,015	1,552,454	292,849	$ (15,294)	$ 10,975	$ 5,349
Net income	150,691				150,464			227
Other comprehensive income (loss)	31,095						31,095
Distributions to non-controlling interest	(1,252)							(1,252)
Purchase of treasury stock	(10,628)					(10,628)
Issuance of stock under purchase and equity compensation plans	(7)			(15,556)		15,549
Stock-based compensation	6,195			6,195
Cash dividends per share, Common Stock, Cash	(45,816)				(45,816)
Dividends per share, Preferred Stock, Cash	(4,500)				(4,500)
Balance at Jun. 30, 2017	2,628,207	144,784	510,015	1,546,534	390,853	(10,373)	42,070	4,324
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]	0				(2,932)		2,932
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	0				33,320		(33,320)
Balance at Dec. 31, 2017	2,718,184	144,784	535,407	1,815,360	221,374	(14,473)	14,108	1,624
Net income	213,385				211,314			2,071
Other comprehensive income (loss)	(92,501)						(92,501)
Distributions to non-controlling interest	(299)							(299)
Purchase of treasury stock	(19,069)					(19,069)
Issuance of stock under purchase and equity compensation plans	(9)			(17,697)		17,688
Stock-based compensation	6,394			6,394
Cash dividends per share, Common Stock, Cash	(50,202)				(50,202)
Dividends per share, Preferred Stock, Cash	(4,500)				(4,500)
Balance at Jun. 30, 2018	$ 2,771,383	$ 144,784	$ 535,407	$ 1,804,057	$ 408,374	$ (15,854)	$ (108,781)	$ 3,396

Consolidated Statements Of Cha7

Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, per share, cash paid	$ 0.470	$ 0.429
Preferred Stock, Dividends, per share, cash paid	$ 0.750	$ 0.750

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES:
Net income		$ 213,385	$ 150,691
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		20,439	21,886
Provision for depreciation and amortization		19,180	19,890
Amortization of investment security premiums, net		11,679	17,827
Investment securities gains (losses), net	[1]	(2,335)	(879)
Net gains on sales of loans held for sale		(2,671)	(3,547)
Origination of loans held for sale		(89,183)	(96,943)
Proceeds from sales and repayments of held for sale		91,671	92,423
Net (increase) decrease in trading securities, excluding unsettled transactions		(23,843)	6,097
Stock-based compensation		6,394	6,195
(Increase) decrease in interest receivable		(1,717)	(428)
Increase (decrease) in interest payable		(601)	(692)
Increase (decrease) in income taxes payable		25,721	1,483
Other changes, net		19,958	(6,939)
Net cash provided by (used in) operating activities		288,077	207,064
INVESTING ACTIVITIES:
Proceeds from sales of investment securities	[1]	192,522	6,552
Proceeds from maturities/pay downs of investment securities	[1]	812,970	910,411
Purchases of investment securities	[1]	(748,707)	(625,931)
Net (increase) decrease in loans		7,978	(234,405)
Proceeds from Securities Purchased under Agreements to Resell		0	100,000
Purchases of land, buildings and equipment		(13,525)	(14,117)
Sales of land, buildings and equipment		1,667	2,527
Net cash provided by (used in) investing activities		252,905	145,037
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(27,222)	77,562
Net increase (decrease) in time open and C.D.'s		(83,895)	(157,367)
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase		(340,379)	(467,461)
Repayment of long-term borrowings		(149)	(146)
Proceeds from Short-term Debt		7,682	0
Purchases of treasury stock		(19,069)	(10,628)
Issuance of stock under equity compensation plans		(9)	(7)
Cash dividends paid on common stock		(50,202)	(45,816)
Cash dividends paid on preferred stock		(4,500)	(4,500)
Net cash provided by (used in) financing activities		(517,743)	(608,363)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect		23,239	(256,262)
Cash, cash equivalents and restricted cash at beginning of year		524,352	801,641
Cash, cash equivalents and restricted cash at June 30		547,591	545,379
Supplemental Cash Flow Information:
Income tax payments, net		24,969	54,621
Interest paid on deposits and borrowings		28,368	21,203
Loans transferred to foreclosed real estate		$ 1,044	$ 461
[1]	Available for sale and non-marketable securities

Consolidated Statements Of Cas9

Consolidated Statements Of Cash Flows Cash Flow Additional Information - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Restricted Cash and Cash Equivalents	$ 14.8	$ 14.3

Principles Of Consolidation And

Principles Of Consolidation And Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles Of Consolidation And Presentation	Principles of Consolidation and Presentation The accompanying consolidated financial statements include the accounts of Commerce Bancshares, Inc. and all majority-owned subsidiaries (the Company). Most of the Company's operations are conducted by its subsidiary bank, Commerce Bank (the Bank). The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, all adjustments necessary to present fairly the financial position and the results of operations for the interim periods have been made. All such adjustments are of a normal recurring nature. All significant intercompany accounts and transactions have been eliminated. Certain reclassifications were made to 2017 data to conform to current year presentation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Management has evaluated subsequent events for potential recognition or disclosure. The results of operations for the three and six month periods ended June 30, 2018 are not necessarily indicative of results to be attained for the full year or any other interim period. The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission. Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the Company's most recent Annual Report on Form 10-K, containing the latest audited consolidated financial statements and notes thereto. These financial statements reflect the adoption of several FASB Accounting Standards Updates (ASUs) on January 1, 2018. In some cases, the adoption of these ASUs resulted in changes to former accounting policies as described in Note 1 to the financial statements in the 2017 Annual Report on Form 10-K. The ASUs which affected the Company's 2018 financial statements include: • ASU 2014-09, Revenue from Contracts with Customers, which is discussed further in Note 13. • ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which is discussed further in Note 3 - Investment Securities, Note 8 - Accumulated Other Comprehensive Income, and Note 15 - Fair Value of Financial Instruments. • ASU 2016-18, Restricted Cash, which requires that the beginning and end of period amounts shown on the statement of cash flows include not only cash and cash equivalents, but also restricted cash and restricted cash equivalents, as considered such by the reporting entity. • ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which is discussed further in Note 6 - Pension. • ASU 2018-02, Reclassification for Certain Tax Effects from Accumulated Other Comprehensive Income, which is discussed further in Note 8 - Accumulated Other Comprehensive Income.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	6 Months Ended
	Jun. 30, 2018
Loans And Allowance For Loan Losses [Abstract]
Loans And Allowance For Loan Losses	Loans and Allowance for Loan Losses Major classifications within the Company’s held for investment loan portfolio at June 30, 2018 and December 31, 2017 are as follows: (In thousands) June 30, 2018 December 31, 2017 Commercial: Business $ 4,990,298 $ 4,958,554 Real estate – construction and land 967,151 968,820 Real estate – business 2,727,580 2,697,452 Personal Banking: Real estate – personal 2,102,586 2,062,787 Consumer 2,012,644 2,104,487 Revolving home equity 374,557 400,587 Consumer credit card 775,214 783,864 Overdrafts 4,081 7,123 Total loans $ 13,954,111 $ 13,983,674 At June 30, 2018 , loans of $3.7 billion were pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits. Additional loans of $1.7 billion were pledged at the Federal Reserve Bank as collateral for discount window borrowings. Allowance for loan losses A summary of the activity in the allowance for loan losses during the three and six months ended June 30, 2018 and 2017 , respectively, follows: For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Balance at beginning of period $ 93,065 $ 66,467 $ 159,532 $ 93,704 $ 65,828 $ 159,532 Provision 485 9,558 10,043 (409 ) 20,848 20,439 Deductions: Loans charged off 362 13,323 13,685 728 26,688 27,416 Less recoveries on loans 663 2,979 3,642 1,284 5,693 6,977 Net loan charge-offs (recoveries) (301 ) 10,344 10,043 (556 ) 20,995 20,439 Balance June 30, 2018 $ 93,851 $ 65,681 $ 159,532 $ 93,851 $ 65,681 $ 159,532 Balance at beginning of period $ 92,951 $ 64,881 $ 157,832 $ 91,361 $ 64,571 $ 155,932 Provision (111 ) 10,869 10,758 1,002 20,884 21,886 Deductions: Loans charged off 531 13,415 13,946 1,077 25,745 26,822 Less recoveries on loans 430 2,758 3,188 1,453 5,383 6,836 Net loan charge-offs (recoveries) 101 10,657 10,758 (376 ) 20,362 19,986 Balance June 30, 2017 $ 92,739 $ 65,093 $ 157,832 $ 92,739 $ 65,093 $ 157,832 The following table shows the balance in the allowance for loan losses and the related loan balance at June 30, 2018 and December 31, 2017 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under Accounting Standards Codification (ASC) 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans discussed below, which are deemed to have similar risk characteristics and are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20. Impaired Loans All Other Loans (In thousands) Allowance for Loan Losses Loans Outstanding Allowance for Loan Losses Loans Outstanding June 30, 2018 Commercial $ 2,631 $ 90,724 $ 91,220 $ 8,594,305 Personal Banking 919 18,172 64,762 5,250,910 Total $ 3,550 $ 108,896 $ 155,982 $ 13,845,215 December 31, 2017 Commercial $ 3,067 $ 92,613 $ 90,637 $ 8,532,213 Personal Banking 1,176 22,182 64,652 5,336,666 Total $ 4,243 $ 114,795 $ 155,289 $ 13,868,879 Impaired loans The table below shows the Company’s investment in impaired loans at June 30, 2018 and December 31, 2017 . These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings. These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. They are discussed further in the "Troubled debt restructurings" section on page 15. (In thousands) June 30, 2018 Dec. 31, 2017 Non-accrual loans $ 9,472 $ 11,983 Restructured loans (accruing) 99,424 102,812 Total impaired loans $ 108,896 $ 114,795 The following table provides additional information about impaired loans held by the Company at June 30, 2018 and December 31, 2017 , segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided. (In thousands) Recorded Investment Unpaid Principal Balance Related Allowance June 30, 2018 With no related allowance recorded: Business $ 4,946 $ 8,936 $ — Real estate – business 1,210 1,300 — $ 6,156 $ 10,236 $ — With an allowance recorded: Business $ 70,871 $ 71,157 $ 2,090 Real estate – construction and land 1,342 1,346 39 Real estate – business 12,355 12,928 502 Real estate – personal 5,707 8,134 295 Consumer 5,464 5,464 52 Revolving home equity 114 114 11 Consumer credit card 6,887 6,887 561 $ 102,740 $ 106,030 $ 3,550 Total $ 108,896 $ 116,266 $ 3,550 December 31, 2017 With no related allowance recorded: Business $ 5,356 $ 9,000 $ — Real estate – business 1,299 1,303 — Consumer 779 817 — $ 7,434 $ 11,120 $ — With an allowance recorded: Business $ 72,589 $ 73,168 $ 2,455 Real estate – construction and land 837 841 27 Real estate – business 12,532 13,071 585 Real estate – personal 9,126 11,914 532 Consumer 5,388 5,426 67 Revolving home equity 204 204 11 Consumer credit card 6,685 6,685 566 $ 107,361 $ 111,309 $ 4,243 Total $ 114,795 $ 122,429 $ 4,243 Total average impaired loans for the three and six month periods ended June 30, 2018 and 2017 , respectively, are shown in the table below. (In thousands) Commercial Personal Banking Total Average Impaired Loans: For the three months ended June 30, 2018 Non-accrual loans $ 7,676 $ 2,005 $ 9,681 Restructured loans (accruing) 81,832 17,122 98,954 Total $ 89,508 $ 19,127 $ 108,635 For the six months ended June 30, 2018 Non-accrual loans $ 8,097 $ 2,464 $ 10,561 Restructured loans (accruing) 80,552 17,943 98,495 Total $ 88,649 $ 20,407 $ 109,056 For the three months ended June 30, 2017 Non-accrual loans $ 9,867 $ 4,539 $ 14,406 Restructured loans (accruing) 34,765 15,780 50,545 Total $ 44,632 $ 20,319 $ 64,951 For the six months ended June 30, 2017 Non-accrual loans $ 10,238 $ 4,027 $ 14,265 Restructured loans (accruing) 33,333 15,991 49,324 Total $ 43,571 $ 20,018 $ 63,589 The table below shows interest income recognized during the three and six month periods ended June 30, 2018 and 2017 , respectively, for impaired loans held at the end of each period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section on page 15. For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Interest income recognized on impaired loans: Business $ 821 $ 319 $ 1,641 $ 637 Real estate – construction and land 22 1 44 2 Real estate – business 147 88 294 175 Real estate – personal 52 36 103 71 Consumer 82 80 164 159 Revolving home equity 1 6 2 12 Consumer credit card 159 145 317 289 Total $ 1,284 $ 675 $ 2,565 $ 1,345 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 June 30, 2018 and December 31, 2017 . (In thousands) Current or Less Than 30 Days Past Due 30 – 89 Days Past Due 90 Days Past Due and Still Accruing Non-accrual Total June 30, 2018 Commercial: Business $ 4,983,337 $ 1,404 $ 443 $ 5,114 $ 4,990,298 Real estate – construction and land 963,654 3,492 — 5 967,151 Real estate – business 2,718,888 6,227 — 2,465 2,727,580 Personal Banking: Real estate – personal 2,092,350 7,155 1,193 1,888 2,102,586 Consumer 1,985,195 25,096 2,353 — 2,012,644 Revolving home equity 372,865 708 984 — 374,557 Consumer credit card 758,230 8,504 8,480 — 775,214 Overdrafts 3,731 350 — — 4,081 Total $ 13,878,250 $ 52,936 $ 13,453 $ 9,472 $ 13,954,111 December 31, 2017 Commercial: Business $ 4,949,148 $ 3,085 $ 374 $ 5,947 $ 4,958,554 Real estate – construction and land 967,321 1,473 21 5 968,820 Real estate – business 2,694,234 482 — 2,736 2,697,452 Personal Banking: Real estate – personal 2,050,787 6,218 3,321 2,461 2,062,787 Consumer 2,067,025 32,674 3,954 834 2,104,487 Revolving home equity 397,349 1,962 1,276 — 400,587 Consumer credit card 764,568 10,115 9,181 — 783,864 Overdrafts 6,840 283 — — 7,123 Total $ 13,897,272 $ 56,292 $ 18,127 $ 11,983 $ 13,983,674 Credit quality The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is 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 June 30, 2018 Pass $ 4,771,613 $ 954,492 $ 2,648,144 $ 8,374,249 Special mention 58,771 10,501 33,791 103,063 Substandard 154,800 2,153 43,180 200,133 Non-accrual 5,114 5 2,465 7,584 Total $ 4,990,298 $ 967,151 $ 2,727,580 $ 8,685,029 December 31, 2017 Pass $ 4,740,013 $ 955,499 $ 2,593,005 $ 8,288,517 Special mention 59,177 10,614 50,577 120,368 Substandard 153,417 2,702 51,134 207,253 Non-accrual 5,947 5 2,736 8,688 Total $ 4,958,554 $ 968,820 $ 2,697,452 $ 8,624,826 The credit quality of Personal Banking loans is monitored primarily on the basis of aging/delinquency, and this information is provided in the table in the above "Delinquent and non-accrual loans" section. In addition, FICO scores are obtained and updated on a quarterly basis for most of the loans in the Personal Banking portfolio. This is a published credit score designed to measure the risk of default by taking into account various factors from a borrower's financial history. The Bank normally obtains a FICO score at the loan's origination and renewal dates, and updates are obtained on a quarterly basis. Excluded from the table below are certain personal real estate loans for which FICO scores are not obtained because they generally pertain to commercial customer activities and are often underwritten with other collateral considerations. These loans totaled $211.1 million at June 30, 2018 and $219.2 million at December 31, 2017 . The table also excludes consumer loans related to the Company's patient healthcare loan program, which totaled $161.8 million at June 30, 2018 and $145.0 million at December 31, 2017 . As the healthcare loans are guaranteed by the hospital, FICO scores are not considered relevant for this program. The personal real estate loans and consumer loans excluded below totaled less than 8% of the Personal Banking portfolio. For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at June 30, 2018 and December 31, 2017 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card June 30, 2018 FICO score: Under 600 1.1 % 3.2 % .8 % 4.6 % 600 - 659 2.0 5.1 1.6 14.1 660 - 719 10.0 18.0 9.2 35.3 720 - 779 23.6 23.6 22.1 26.4 780 and over 63.3 50.1 66.3 19.6 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2017 FICO score: Under 600 1.3 % 3.3 % 1.1 % 4.7 % 600 - 659 2.1 5.5 1.7 14.4 660 - 719 10.5 17.3 9.5 34.4 720 - 779 25.6 26.8 21.4 26.0 780 and over 60.5 47.1 66.3 20.5 Total 100.0 % 100.0 % 100.0 % 100.0 % Troubled debt restructurings As mentioned previously, the Company's impaired loans include loans which have been classified as troubled debt restructurings, as shown in the table below. Restructured loans are those extended to borrowers who are experiencing financial difficulty and who have been granted a concession. Restructured loans are placed on non-accrual status if the Company does not believe it probable that amounts due under the contractual terms will be collected. Other performing restructured loans are comprised of certain business, construction and business real estate loans classified as substandard. Upon maturity, the loans renewed at interest rates judged not to be market rates for new debt with similar risk and as a result were classified as troubled debt restructurings. These loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. Troubled debt restructurings also include certain credit card loans under various debt management and assistance programs. Modifications to credit card loans generally involve removing the available line of credit, placing loans on amortizing status, and lowering the contractual interest rate. The Company also classified certain loans as troubled debt restructings because they were not reaffirmed by the borrower in bankruptcy proceedings. These loans are comprised of personal real estate, revolving home equity and consumer loans. Interest on these loans is being recognized on an accrual basis, as the borrowers are continuing to make payments. (In thousands) June 30, 2018 December 31, 2017 Accruing loans: Non-market interest rates $ 86,906 $ 88,588 Assistance programs 6,887 6,685 Bankruptcy non-affirmation 5,335 7,283 Other 296 256 Non-accrual loans 7,156 7,796 Total troubled debt restructurings $ 106,580 $ 110,608 The table below shows the balance of troubled debt restructurings by loan classification at June 30, 2018 , in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal. (In thousands) June 30, 2018 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 75,680 $ 32 Real estate - construction and land 1,337 — Real estate - business 12,311 — Personal Banking: Real estate - personal 4,787 303 Consumer 5,464 115 Revolving home equity 114 42 Consumer credit card 6,887 577 Total troubled debt restructurings $ 106,580 $ 1,069 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 $925 thousand on an annual, pre-tax basis, compared to amounts contractually owed. The allowance for loan losses related to troubled debt restructurings on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as troubled debt restructurings. Those performing loans classified as troubled debt restructurings are accruing loans which management expects to collect under contractual terms. Performing commercial loans have had no other concessions granted other than being renewed at an interest rate judged not to be market. As such, they have similar risk characteristics as non-troubled debt commercial loans and are collectively evaluated based on internal risk rating, loan type, delinquency, historical experience and current economic factors. Performing personal banking loans classified as troubled debt restructurings resulted from the borrower not reaffirming the debt during bankruptcy and have had no other concession granted, other than the Bank's future limitations on collecting payment deficiencies or in pursuing foreclosure actions. As such, they have similar risk characteristics as non-troubled debt personal banking loans and are evaluated collectively based on loan type, delinquency, historical experience and current economic factors. If a troubled debt restructuring defaults and is already on non-accrual status, the allowance for loan losses continues to be based on individual evaluation, using discounted expected cash flows or the fair value of collateral. If an accruing troubled debt restructuring defaults, the loan's risk rating is downgraded to non-accrual status and the loan's related allowance for loan losses is determined based on individual evaluation, or if necessary, the loan is charged off and collection efforts begun. The Company had commitments of $6.1 million at June 30, 2018 to lend additional funds to borrowers with restructured loans. Loans held for sale The Company designates certain long-term fixed rate personal real estate loans as held for sale, and the Company has elected the fair value option for these loans. The election of the fair value option aligns the accounting for these loans with the related economic hedges discussed in Note 10. The loans are primarily sold to FNMA, FHLMC, and GNMA. At June 30, 2018 , the fair value of these loans was $10.8 million , and the unpaid principal balance was $10.4 million . The Company also designates student loan originations as held for sale. The borrowers are credit-worthy students who are attending colleges and universities. The loans are intended to be sold in the secondary market, and the Company maintains contracts with Sallie Mae to sell the loans within 210 days after the last disbursement to the student. These loans are carried at lower of cost or fair value, which at June 30, 2018 totaled $9.6 million . At June 30, 2018 , none of the loans held for sale were on non-accrual status or 90 days past due and still accruing. Foreclosed real estate/repossessed assets The Company’s holdings of foreclosed real estate totaled $1.0 million and $681 thousand at June 30, 2018 and December 31, 2017 , respectively. Personal property acquired in repossession, generally autos and marine and recreational vehicles, totaled $2.3 million and $2.7 million at June 30, 2018 and December 31, 2017 , respectively. Upon acquisition, these assets are recorded at fair value less estimated selling costs at the date of foreclosure, establishing a new cost basis. They are subsequently carried at the lower of this cost basis or fair value less estimated selling costs.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2018
Investment Securities [Abstract]
Investment Securities	Investment Securities Investment securities as shown in this report reflect revised categories as required by the Company’s adoption of ASU 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities”, on January 1, 2018. That new guidance refined the definition of equity securities and required their segregation from available for sale debt securities. For comparability purposes, prior period disclosures in this report have been revised to show the new categorization. June 30, 2018 December 31, 2017 Available for sale debt securities $ 8,412,376 $ 8,725,442 Trading debt securities 31,156 18,269 Equity securities: Readily determinable fair value 2,741 48,838 No readily determinable fair value 1,703 1,753 Other: Federal Reserve Bank stock 33,369 33,253 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 68,940 55,752 Total investment securities $ 8,560,285 $ 8,893,307 While changes in the fair value of available for sale debt securities continue to be recorded in the equity category of accumulated other comprehensive income, the new guidance requires changes in the fair value of equity securities to be recorded in current earnings. As required by the new guidance, the unrealized gain in fair value on equity securities (recorded in accumulated other comprehensive income at December 31, 2017) was reclassified to retained earnings on January 1, 2018. The amount of the reclassification was $33.3 million , net of tax. Equity securities include common and preferred stock with readily determinable fair values that totaled $2.5 million at cost and $2.7 million at fair value at June 30, 2018 . The decline in these balances from prior periods was due to a third party merger transaction in June 2018, in which the majority of these securities were redeemed for cash of $39.9 million . During the first six months of 2018 , unrealized net losses of $176 thousand were recognized in current earnings on equity securities still held at June 30, 2018 . Equity securities also include securities with a carrying value of $1.7 million that do not have readily determinable fair values. The Company has elected, under the ASU, to measure these at cost minus impairment, if any, plus or minus changes resulting from observable price changes for the identical or similar investment of the same issuer. The Company did not record any impairment or other adjustments to the carrying amount of these investments during the period. Other investment securities whose accounting is not addressed in the ASU include Federal Reserve Bank (FRB) stock, Federal Home Loan Bank (FHLB) stock, and investments in portfolio concerns held by the Company's private equity subsidiaries. FRB stock and FHLB stock are held for debt and regulatory purposes. Investment in FRB stock is based on the capital structure of the investing bank, and investment in FHLB stock is tied to the level of borrowings from the FHLB. These holdings are carried at cost. The private equity investments, in the absence of readily ascertainable market values, are carried at estimated fair value. The majority of the Company’s investment portfolio is comprised of available for sale debt securities, which are carried at fair value with changes in fair value reported in accumulated other comprehensive income (AOCI). A summary of the available for sale debt securities by maturity groupings as of June 30, 2018 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as the FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral. (In thousands) Amortized Cost Fair Value U.S. government and federal agency obligations: Within 1 year $ 52,660 $ 52,603 After 1 but within 5 years 645,431 634,819 After 5 but within 10 years 157,967 155,108 After 10 years 69,202 68,562 Total U.S. government and federal agency obligations 925,260 911,092 Government-sponsored enterprise obligations: Within 1 year 117,562 117,444 After 1 but within 5 years 121,584 119,743 After 5 but within 10 years 34,984 33,946 After 10 years 42,852 40,228 Total government-sponsored enterprise obligations 316,982 311,361 State and municipal obligations: Within 1 year 147,325 147,668 After 1 but within 5 years 598,663 600,688 After 5 but within 10 years 591,819 590,950 After 10 years 40,963 39,858 Total state and municipal obligations 1,378,770 1,379,164 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,194,764 3,131,025 Non-agency mortgage-backed securities 1,019,545 1,010,331 Asset-backed securities 1,351,461 1,338,542 Total mortgage and asset-backed securities 5,565,770 5,479,898 Other debt securities: Within 1 year 9,003 8,971 After 1 but within 5 years 257,704 252,151 After 5 but within 10 years 73,283 69,739 Total other debt securities 339,990 330,861 Total available for sale debt securities $ 8,526,772 $ 8,412,376 Investments in U.S. government and federal agency obligations include U.S. Treasury inflation-protected securities, which totaled $443.8 million , at fair value, at June 30, 2018 . Interest paid on these securities increases with inflation and decreases with deflation, as measured by the Consumer Price Index. Included in state and municipal obligations are $15.1 million , at fair value, of auction rate securities, which were purchased from bank customers in 2008. Interest on these bonds is currently being paid at the maximum failed auction rates. For debt securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in AOCI, by security type. (In thousands) Amortized Cost Gross Gross Fair Value June 30, 2018 U.S. government and federal agency obligations $ 925,260 $ 503 $ (14,671 ) $ 911,092 Government-sponsored enterprise obligations 316,982 — (5,621 ) 311,361 State and municipal obligations 1,378,770 8,105 (7,711 ) 1,379,164 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,194,764 5,995 (69,734 ) 3,131,025 Non-agency mortgage-backed securities 1,019,545 6,232 (15,446 ) 1,010,331 Asset-backed securities 1,351,461 2,343 (15,262 ) 1,338,542 Total mortgage and asset-backed securities 5,565,770 14,570 (100,442 ) 5,479,898 Other debt securities 339,990 — (9,129 ) 330,861 Total $ 8,526,772 $ 23,178 $ (137,574 ) $ 8,412,376 December 31, 2017 U.S. government and federal agency obligations $ 917,494 $ 4,096 $ (4,443 ) $ 917,147 Government-sponsored enterprise obligations 408,266 26 (1,929 ) 406,363 State and municipal obligations 1,592,707 21,413 (2,754 ) 1,611,366 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,046,701 17,956 (23,744 ) 3,040,913 Non-agency mortgage-backed securities 903,920 6,710 (4,837 ) 905,793 Asset-backed securities 1,495,380 2,657 (5,237 ) 1,492,800 Total mortgage and asset-backed securities 5,446,001 27,323 (33,818 ) 5,439,506 Other debt securities 350,988 1,250 (1,178 ) 351,060 Total $ 8,715,456 $ 54,108 $ (44,122 ) $ 8,725,442 The Company’s impairment policy requires a review of all securities for which fair value is less than amortized cost. Special emphasis and analysis is placed on securities whose credit rating has fallen below A3 (Moody's) or A- (Standard & Poor's), whose fair values have fallen more than 20% below purchase price for an extended period of time, or who have been identified based on management’s judgment. These securities are placed on a watch list, and for all such securities, cash flow analyses are prepared. For more complex analyses, detailed cash flow models are prepared which use inputs specific to each security. Inputs to these models include factors such as cash flow received, contractual payments required, and various other information related to the underlying collateral (including current delinquencies), collateral loss severity rates (including loan to values), expected delinquency rates, credit support from other tranches, and prepayment speeds. Stress tests are performed at varying levels of delinquency rates, prepayment speeds and loss severities in order to gauge probable ranges of credit loss. At June 30, 2018 , the fair value of securities on this watch list was $57.3 million compared to $68.0 million at December 31, 2017 . As of June 30, 2018 , the Company had recorded other-than-temporary impairment (OTTI) on certain non-agency mortgage-backed securities, part of the watch list mentioned above, which had an aggregate fair value of $22.4 million . The cumulative credit-related portion of the impairment on these securities, which was recorded in earnings, totaled $14.2 million . The Company does not intend to sell these securities and believes it is not likely that it will be required to sell the securities before the recovery of their amortized cost. The credit-related portion of the loss on these securities was based on the cash flows projected to be received over the estimated life of the securities, discounted to present value, and compared to the current amortized cost bases of the securities. Significant inputs to the cash flow models used to calculate the credit losses on these securities at June 30, 2018 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 13% - 52% Credit support 0% - 20% Loss severity 14% - 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 Six Months Ended June 30 (In thousands) 2018 2017 Cumulative OTTI credit losses at January 1 $ 14,199 $ 14,080 Credit losses on debt securities for which impairment was not previously recognized 58 46 Credit losses on debt securities for which impairment was previously recognized 10 274 Increase in expected cash flows that are recognized over remaining life of security (104 ) (146 ) Cumulative OTTI credit losses at June 30 $ 14,163 $ 14,254 Debt securities with unrealized losses recorded in AOCI are shown in the table below, along with the length of the impairment period. Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses June 30, 2018 U.S. government and federal agency obligations $ 707,018 $ 12,156 $ 90,340 $ 2,515 $ 797,358 $ 14,671 Government-sponsored enterprise obligations 261,378 5,605 49,983 16 311,361 5,621 State and municipal obligations 458,880 5,700 51,863 2,011 510,743 7,711 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,029,957 45,267 566,986 24,467 2,596,943 69,734 Non-agency mortgage-backed securities 773,890 12,076 134,679 3,370 908,569 15,446 Asset-backed securities 862,416 13,296 173,895 1,966 1,036,311 15,262 Total mortgage and asset-backed securities 3,666,263 70,639 875,560 29,803 4,541,823 100,442 Other debt securities 311,714 8,033 19,147 1,096 330,861 9,129 Total $ 5,405,253 $ 102,133 $ 1,086,893 $ 35,441 $ 6,492,146 $ 137,574 December 31, 2017 U.S. government and federal agency obligations $ 618,617 $ 4,443 $ — $ — $ 618,617 $ 4,443 Government-sponsored enterprise obligations 286,393 1,712 49,766 217 336,159 1,929 State and municipal obligations 282,843 1,752 49,339 1,002 332,182 2,754 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,320,689 9,433 619,300 14,311 1,939,989 23,744 Non-agency mortgage-backed securities 577,017 2,966 153,813 1,871 730,830 4,837 Asset-backed securities 786,048 3,168 264,295 2,069 1,050,343 5,237 Total mortgage and asset-backed securities 2,683,754 15,567 1,037,408 18,251 3,721,162 33,818 Other debt securities 144,090 727 20,202 451 164,292 1,178 Total $ 4,015,697 $ 24,201 $ 1,156,715 $ 19,921 $ 5,172,412 $ 44,122 The available for sale debt portfolio included $6.5 billion of securities that were in a loss position at June 30, 2018, compared to $5.2 billion at December 31, 2017. The total amount of unrealized loss on these securities was $137.6 million at June 30, 2018, an increase of $93.5 million compared to the loss at December 31, 2017. This increase in losses was mainly due to a rising rate environment. The following tables present proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Six Months Ended June 30 (In thousands) 2018 2017 Proceeds from sales of securities: Available for sale debt securities $ 152,541 $ 4,972 Equity securities 39,981 584 Other — 996 Total proceeds $ 192,522 $ 6,552 Investment securities gains (losses), net: Available for sale debt securities: Losses realized on called bonds $ — $ (254 ) Gains realized on sales 423 — Losses realized on sales — (22 ) Other-than-temporary impairment recognized on debt securities (68 ) (320 ) Equity securities: Gains realized on donations of securities — 4,315 Gains realized on sales 102 584 Losses realized on sales (8,917 ) — Fair value adjustments, net 2,699 — Other: Gains realized on sales — 58 Losses realized on sales — (652 ) Fair value adjustments, net 8,096 (2,830 ) Total investment securities gains, net $ 2,335 $ 879 Securities gains for the six months ended June 30, 2018 included gains in fair value of $8.1 million on private equity investments and $2.7 million on equity securities. These were offset by an $8.9 million adjustment to recognize dividend income on a equity security liquidated during the second quarter of 2018. At June 30, 2018 , securities totaling $3.8 billion in fair value were pledged to secure public fund deposits, securities sold under agreements to repurchase, trust funds, and borrowings at the FRB and FHLB. Securities pledged under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties approximated $557.7 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	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets	Goodwill and Other Intangible Assets The following table presents information about the Company's intangible assets which have estimable useful lives. June 30, 2018 December 31, 2017 (In thousands) Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Amortizable intangible assets: Core deposit premium $ 31,270 $ (28,650 ) $ — $ 2,620 $ 31,270 $ (28,305 ) $ — $ 2,965 Mortgage servicing rights 8,996 (3,533 ) — 5,463 7,906 (3,244 ) (9 ) 4,653 Total $ 40,266 $ (32,183 ) $ — $ 8,083 $ 39,176 $ (31,549 ) $ (9 ) $ 7,618 Aggregate amortization expense on intangible assets was $313 thousand and $330 thousand for the three month periods ended June 30, 2018 and 2017 , respectively, and $634 thousand and $678 thousand for the six month periods ended June 30, 2018 and 2017 , respectively. The following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of June 30, 2018 . The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. (In thousands) 2018 $ 1,232 2019 1,094 2020 937 2021 816 2022 720 Changes in the carrying amount of goodwill and net other intangible assets for the six month period ended June 30, 2018 are as follows: (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance January 1, 2018 $ 138,921 $ 2,965 $ 4,653 Originations — — 1,090 Amortization — (345 ) (289 ) Impairment reversal — — 9 Balance June 30, 2018 $ 138,921 $ 2,620 $ 5,463 Goodwill allocated to the Company’s operating segments at June 30, 2018 and December 31, 2017 is shown below. (In thousands) Consumer segment $ 70,721 Commercial segment 67,454 Wealth segment 746 Total goodwill $ 138,921

Guarantees

Guarantees	6 Months Ended
	Jun. 30, 2018
Guarantees [Abstract]
Guarantees	Guarantees The Company, as a provider of financial services, routinely issues financial guarantees in the form of financial and performance standby letters of credit. Standby letters of credit are contingent commitments issued by the Company generally to guarantee the payment or performance obligation of a customer to a third party. While these represent a potential outlay by the Company, a significant amount of the commitments may expire without being drawn upon. The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit. The letters of credit are subject to the same credit policies, underwriting standards and approval process as loans made by the Company. Most of the standby letters of credit are secured, and in the event of nonperformance by customers, the Company has rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities. Upon issuance of standby letters of credit, the Company recognizes a liability for the fair value of the obligation undertaken, which is estimated to be equivalent to the amount of fees received from the customer over the life of the agreement. At June 30, 2018 , that net liability was $2.2 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 $377.5 million at June 30, 2018 . The Company periodically enters into credit risk participation agreements (RPAs) as a guarantor to other financial institutions, in order to mitigate those institutions’ credit risk associated with interest rate swaps with third parties. The RPA stipulates that, in the event of default by the third party on the interest rate swap, the Company will reimburse a portion of the loss borne by the financial institution. These interest rate swaps are normally collateralized (generally with real property, inventories and equipment) by the third party, which limits the credit risk associated with the Company’s RPAs. The third parties usually have other borrowing relationships with the Company. The Company monitors overall borrower collateral and at June 30, 2018 , believes sufficient collateral is available to cover potential swap losses. The RPAs are carried at fair value throughout their term with all changes in fair value, including those due to a change in the third party’s creditworthiness, recorded in current earnings. The terms of the RPAs, which correspond to the terms of the underlying swaps, range from 2 to 11 years. At June 30, 2018 , the fair value of the Company's guarantee liabilities for RPAs was $67 thousand , and the notional amount of the underlying swaps was $103.2 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	6 Months Ended
	Jun. 30, 2018
Pension [Abstract]
Pension	Pension The amount of net pension cost is shown in the table below: For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Service cost - benefits earned during the period $ 152 $ 128 $ 305 $ 257 Interest cost on projected benefit obligation 951 973 1,901 1,946 Expected return on plan assets (1,438 ) (1,438 ) (2,875 ) (2,876 ) Amortization of prior service cost (67 ) (68 ) (135 ) (136 ) Amortization of unrecognized net loss 592 617 1,184 1,234 Net periodic pension cost $ 190 $ 212 $ 380 $ 425 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 six months of 2018 , the Company made no funding contributions to its defined benefit pension plan and made minimal funding contributions to a supplemental executive retirement plan (the CERP), which carries no segregated assets. The Company adopted ASU 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost”, on January 1, 2018. This guidance requires that the service cost component of net periodic pension cost be reported in the same income statement line item as other compensation costs, while other components of net periodic pension cost be reported separately from the service cost component. Historically, the Company has reported all components of pension cost in salaries and employee benefits. Beginning in 2018, only the service cost component has been included in this category, and the other components have been recorded in other non-interest expense. Prior period financial statements have not been revised because the amount of the reclassification was not significant.

Common Stock

Common Stock	6 Months Ended
	Jun. 30, 2018
Common Stock [Abstract]
Common Stock	Common Stock * Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 12. For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands, except per share data) 2018 2017 2018 2017 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 110,330 $ 78,960 $ 211,314 $ 150,464 Less preferred stock dividends 2,250 2,250 4,500 4,500 Net income available to common shareholders 108,080 76,710 206,814 145,964 Less income allocated to nonvested restricted stock 1,139 943 2,260 1,888 Net income allocated to common stock $ 106,941 $ 75,767 $ 204,554 $ 144,076 Weighted average common shares outstanding 105,686 105,583 105,660 105,486 Basic income per common share $ 1.02 $ .71 $ 1.94 $ 1.36 Diluted income per common share: Net income available to common shareholders $ 108,080 $ 76,710 $ 206,814 $ 145,964 Less income allocated to nonvested restricted stock 1,136 941 2,254 1,883 Net income allocated to common stock $ 106,944 $ 75,769 $ 204,560 $ 144,081 Weighted average common shares outstanding 105,686 105,583 105,660 105,486 Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods 343 360 338 389 Weighted average diluted common shares outstanding 106,029 105,943 105,998 105,875 Diluted income per common share $ 1.01 $ .71 $ 1.93 $ 1.36 Unexercised stock appreciation rights of 295 thousand and 132 thousand were excluded in the computation of diluted income per common share for the six month periods ended June 30, 2018 and 2017 , respectively, because their inclusion would have been anti-dilutive. * All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2017.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale debt securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. The other component is the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. Unrealized Gains (Losses) on Securities (1) Pension Loss Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 2018 $ 3,411 $ 30,326 $ (19,629 ) $ 14,108 ASU 2018-02 Reclassification of tax rate change 715 6,359 (4,142 ) 2,932 ASU 2016-01 Reclassification of unrealized gain on equity securities — (33,320 ) — (33,320 ) Other comprehensive loss before reclassifications to current earnings (173 ) (123,854 ) — (124,027 ) Amounts reclassified to current earnings from accumulated other comprehensive income 68 (424 ) 1,049 693 Current period other comprehensive income (loss), before tax (105 ) (124,278 ) 1,049 (123,334 ) Income tax (expense) benefit 27 31,068 (262 ) 30,833 Current period other comprehensive income (loss), net of tax (78 ) (93,210 ) 787 (92,501 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 12 (12 ) — — Balance June 30, 2018 $ 4,060 $ (89,857 ) $ (22,984 ) $ (108,781 ) Balance January 1, 2017 $ 2,975 $ 27,328 $ (19,328 ) $ 10,975 Other comprehensive income (loss) before reclassifications to current earnings (44 ) 53,072 — 53,028 Amounts reclassified to current earnings from accumulated other comprehensive income 320 (4,293 ) 1,098 (2,875 ) Current period other comprehensive income, before tax 276 48,779 1,098 50,153 Income tax expense (105 ) (18,536 ) (417 ) (19,058 ) Current period other comprehensive income, net of tax 171 30,243 681 31,095 Transfer of unrealized gain on securities for which impairment was not previously recognized 24 (24 ) — — Balance June 30, 2017 $ 3,170 $ 57,547 $ (18,647 ) $ 42,070 (1) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income. The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (as shown in the table above) to retained earnings. As mentioned in Note 3, additional new accounting guidance, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income to retained earnings (also shown above).

Segments

Segments	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segments	Segments The Company segregates financial information for use in assessing its performance and allocating resources among three operating segments: Consumer, Commercial and Wealth. The Consumer segment consists of various consumer loan and deposit products offered through its retail branch network of approximately 180 locations. This segment also includes indirect and other consumer loan financing businesses, along with debit and credit card loan and fee businesses. Residential mortgage origination, sales and servicing functions are included in this Consumer segment, but residential mortgage loans retained by the Company are not considered part of this segment. The Commercial segment provides corporate lending, leasing, and international services, along with business and governmental deposit products and commercial cash management services. This segment includes both merchant and commercial bank card products. It also includes the Capital Markets Group which sells fixed income securities and provides safekeeping and accounting services to its business and correspondent bank customers. The Wealth segment provides traditional trust and estate planning, advisory and discretionary investment management, and brokerage services. This segment also provides various loan and deposit related services to its private banking customers. The following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below. (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Three Months Ended June 30, 2018 Net interest income $ 73,471 $ 85,721 $ 11,857 $ 171,049 $ 39,910 $ 210,959 Provision for loan losses (10,409 ) 308 16 (10,085 ) 42 (10,043 ) Non-interest income 32,116 51,651 42,896 126,663 (1,813 ) 124,850 Investment securities losses, net — — — — (3,075 ) (3,075 ) Non-interest expense (72,095 ) (75,360 ) (30,254 ) (177,709 ) (4,151 ) (181,860 ) Income before income taxes $ 23,083 $ 62,320 $ 24,515 $ 109,918 $ 30,913 $ 140,831 Six Months Ended June 30, 2018 Net interest income $ 144,908 $ 167,816 $ 23,302 $ 336,026 $ 67,825 $ 403,851 Provision for loan losses (20,924 ) 488 (48 ) (20,484 ) 45 (20,439 ) Non-interest income 62,332 100,862 84,997 248,191 (3,651 ) 244,540 Investment securities gains, net — — — — 2,335 2,335 Non-interest expense (142,266 ) (148,158 ) (62,113 ) (352,537 ) (11,600 ) (364,137 ) Income before income taxes $ 44,050 $ 121,008 $ 46,138 $ 211,196 $ 54,954 $ 266,150 Three Months Ended June 30, 2017 Net interest income $ 69,274 $ 82,137 $ 11,934 $ 163,345 $ 19,462 $ 182,807 Provision for loan losses (10,802 ) 111 24 (10,667 ) (91 ) (10,758 ) Non-interest income 29,617 46,088 38,852 114,557 823 115,380 Investment securities gains, net — — — — 1,651 1,651 Non-interest expense (68,374 ) (72,134 ) (29,494 ) (170,002 ) (6,888 ) (176,890 ) Income before income taxes $ 19,715 $ 56,202 $ 21,316 $ 97,233 $ 14,957 $ 112,190 Six Months Ended June 30, 2017 Net interest income $ 136,628 $ 162,007 $ 23,778 $ 322,413 $ 38,667 $ 361,080 Provision for loan losses (20,464 ) 624 1 (19,839 ) (2,047 ) (21,886 ) Non-interest income 56,780 90,998 76,558 224,336 657 224,993 Investment securities gains, net — — — — 879 879 Non-interest expense (135,791 ) (142,499 ) (59,813 ) (338,103 ) (18,164 ) (356,267 ) Income before income taxes $ 37,153 $ 111,130 $ 40,524 $ 188,807 $ 19,992 $ 208,799 The information presented above was derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. This information is based on internal management accounting procedures and methods, which have been developed to reflect the underlying economics of the businesses. The methodologies are applied in connection with funds transfer pricing and assignment of overhead costs among segments. Funds transfer pricing was used in the determination of net interest income by assigning a standard cost (credit) for funds used (provided) by assets and liabilities based on their maturity, prepayment and/or repricing characteristics. The segment activity, as shown above, includes both direct and allocated items. Amounts in the “Other/Elimination” column include activity not related to the segments, such as that relating to administrative functions, the investment securities portfolio, and the effect of certain expense allocations to the segments. The provision for loan losses in this category contains the difference between net loan charge-offs assigned directly to the segments and the recorded provision for loan loss expense. Included in this category’s net interest income are earnings of the investment portfolio, which are not allocated to a segment. The performance measurement of the operating segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments' financial condition and results of operations if they were independent entities.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2018
Derivative Instrument Detail [Abstract]
Derivative Instruments	Derivative Instruments The notional amounts of the Company’s derivative instruments are shown in the table below. These contractual amounts, along with other terms of the derivative, are used to determine amounts to be exchanged between counterparties and are not a measure of loss exposure. At June 30, 2018 , 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) June 30, 2018 December 31, 2017 Interest rate swaps $ 1,891,877 $ 1,741,412 Interest rate caps 31,483 31,776 Credit risk participation agreements 152,402 133,488 Foreign exchange contracts 8,737 11,826 Mortgage loan commitments 21,653 17,110 Mortgage loan forward sale contracts 2,848 2,566 Forward TBA contracts 25,000 25,000 Total notional amount $ 2,134,000 $ 1,963,178 The largest group of notional amounts relate to interest rate swap contracts sold to commercial customers who wish to modify their interest rate sensitivity. These swaps are offset by matching contracts purchased by the Company from other financial dealer institutions. Contracts with dealers that require central clearing are novated to a regulated clearinghouse who becomes the Company's legal counterparty. Because of the matching terms of the offsetting contracts, in addition to collateral provisions which mitigate the impact of non-performance risk, changes in fair value subsequent to initial recognition have a minimal effect on earnings. Many of the Company’s interest rate swap contracts with large financial institutions contain contingent features relating to debt ratings or capitalization levels. Under these provisions, if the Company’s debt rating falls below investment grade or if the Company ceases to be “well-capitalized” under risk-based capital guidelines, certain counterparties can require immediate and ongoing collateralization on interest rate swaps in net liability positions or instant settlement of the contracts. The Company maintains debt ratings and capital well above these minimum requirements. The Company also contracts with other financial institutions, as a guarantor or beneficiary, to share credit risk associated with certain interest rate swaps through risk participation agreements. The Company’s risks and responsibilities as guarantor are further discussed in Note 5 on Guarantees. In addition, the Company enters into foreign exchange contracts, which are mainly comprised of contracts to purchase or deliver foreign currencies for customers at specific future dates. Under its program to sell residential mortgage loans in the secondary market, the Company designates certain newly-originated residential mortgage loans as held for sale. Derivative instruments arising from this activity include mortgage loan commitments and forward loan sale commitments. Changes in the fair values of the loan commitments and funded loans prior to sale that are due to changes in interest rates are economically hedged with forward contracts to sell residential mortgage-backed securities in the to-be-announced (TBA) market. These forward TBA contracts are also considered to be derivatives and are settled in cash at the security settlement date. The fair values of the Company's derivative instruments, whose notional amounts are listed above, are shown in the table below. Information about the valuation methods used to determine fair value is provided in Note 15 on Fair Value Measurements in the 2017 Annual Report on Form 10-K. The Company's policy is to present its derivative assets and derivative liabilities on a gross basis in its consolidated balance sheets, and these are reported in other assets and other liabilities. However, in January 2017, a clearinghouse rule change required that variation margin on centrally cleared derivatives, formerly treated as collateral, be treated as settlements of derivative exposure. As a result, the fair values of the respective derivative contracts must be reduced by variation margin payments and reported as a single, net amount. Accordingly, at June 30, 2018 in the table below, the positive fair values of cleared swaps were reduced by $15.9 million and the negative fair values of cleared swaps were reduced by $1.5 million . At December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million . Asset Derivatives Liability Derivatives June 30, 2018 Dec. 31, 2017 June 30, 2018 Dec. 31, 2017 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 5,265 $ 7,674 $ (19,616 ) $ (7,857 ) Interest rate caps 20 16 (20 ) (16 ) Credit risk participation agreements 21 46 (67 ) (123 ) Foreign exchange contracts 194 21 (31 ) (40 ) Mortgage loan commitments 730 580 — — Mortgage loan forward sale contracts 8 8 (1 ) (7 ) Forward TBA contracts 1 4 (111 ) (31 ) Total $ 6,239 $ 8,349 $ (19,846 ) $ (8,074 ) The effects of derivative instruments on the consolidated statements of income are shown in the table below. Location of Gain or (Loss) Recognized in Income on Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Derivative instruments: Interest rate swaps Other non-interest income $ 1,727 $ 456 $ 2,232 $ 599 Credit risk participation agreements Other non-interest income 16 1 180 11 Foreign exchange contracts Other non-interest income 173 (55 ) 182 (75 ) Mortgage loan commitments Loan fees and sales 148 (32 ) 149 522 Mortgage loan forward sale contracts Loan fees and sales 6 (4 ) 6 62 Forward TBA contracts Loan fees and sales (9 ) (160 ) 533 (258 ) Total $ 2,061 $ 206 $ 3,282 $ 861 The following table shows the extent to which assets and liabilities relating to derivative instruments have been offset in the consolidated balance sheets. It also provides information about these instruments which are subject to an enforceable master netting arrangement, irrespective of whether they are offset, and the extent to which the instruments could potentially be offset. Also shown is collateral received or pledged in the form of other financial instruments, which is generally cash or marketable securities. The collateral amounts in this table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. Most of the derivatives in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default. Collateral exchanged between the Company and dealer bank counterparties is generally subject to thresholds and transfer minimums, and usually consists of marketable securities. By contract, these may be sold or re-pledged by the secured party until recalled at a subsequent valuation date by the pledging party. For those swap transactions requiring central clearing, the Company posts cash or securities to its clearing agent. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Company are made as appropriate to maintain proper collateralization for these transactions. Swap derivative transactions with customers are generally secured by rights to non-financial collateral, such as real and personal property, which is not shown in the table below. Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Available for Offset Collateral Received/Pledged Net Amount June 30, 2018 Assets: Derivatives subject to master netting agreements $ 5,338 $ — $ 5,338 $ (491 ) $ (2,114 ) $ 2,733 Derivatives not subject to master netting agreements 901 — 901 Total derivatives 6,239 — 6,239 Liabilities: Derivatives subject to master netting agreements $ 19,777 $ — $ 19,777 $ (491 ) $ (354 ) $ 18,932 Derivatives not subject to master netting agreements 69 — 69 Total derivatives 19,846 — 19,846 December 31, 2017 Assets: Derivatives subject to master netting agreements $ 7,726 $ — $ 7,726 $ (233 ) $ (824 ) $ 6,669 Derivatives not subject to master netting agreements 623 — 623 Total derivatives 8,349 — 8,349 Liabilities: Derivatives subject to master netting agreements $ 7,935 $ — $ 7,935 $ (233 ) $ (1,570 ) $ 6,132 Derivatives not subject to master netting agreements 139 — 139 Total derivatives 8,074 — 8,074

Resale and Repurchase Agreement

Resale and Repurchase Agreements (Notes)	6 Months Ended
	Jun. 30, 2018
Resale and Repurchase Agreements [Abstract]
Resale and Repurchase Agreements [Text Block]	Resale and Repurchase Agreements The following table shows the extent to which assets and liabilities relating to securities purchased under agreements to resell (resale agreements) and securities sold under agreements to repurchase (repurchase agreements) have been offset in the consolidated balance sheets, in addition to the extent to which they could potentially be offset. Also shown is collateral received or pledged, which consists of marketable securities. The collateral amounts in the table are limited to the outstanding balances of the related asset or liability (after netting is applied); thus amounts of excess collateral are not shown. The agreements in the following table were transacted under master netting arrangements that contain a conditional right of offset, such as close-out netting, upon default. Resale and repurchase agreements are agreements to purchase/sell securities subject to an obligation to resell/repurchase the same or similar securities. They are accounted for as collateralized financing transactions, not as sales and purchases of the securities portfolio. The securities collateral accepted or pledged in resale and repurchase agreements with other financial institutions also may be sold or re-pledged by the secured party, but is usually delivered to and held by third party trustees. The Company generally retains custody of securities pledged for repurchase agreements with customers. The Company is party to several agreements commonly known as collateral swaps. These agreements involve the exchange of collateral under simultaneous repurchase and resale agreements with the same financial institution counterparty. These repurchase and resale agreements have the same principal amounts, inception dates, and maturity dates and have been offset against each other in the consolidated balance sheets, as permitted under the netting provisions of ASC 210-20-45. The collateral swaps totaled $550.0 million at June 30, 2018 and $650.0 million at December 31, 2017 . At June 30, 2018 , the Company had posted collateral of $557.0 million in marketable securities, consisting of agency mortgage-backed bonds and treasuries, and had accepted $556.0 million in investment grade asset-backed, commercial mortgage-backed, and corporate bonds. Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Available for Offset Securities Collateral Received/Pledged Net Amount June 30, 2018 Total resale agreements, subject to master netting arrangements $ 1,250,000 $ (550,000 ) $ 700,000 $ — $ (698,414 ) $ 1,586 Total repurchase agreements, subject to master netting arrangements 1,585,074 (550,000 ) 1,035,074 — (1,035,074 ) — December 31, 2017 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,954,768 (650,000 ) 1,304,768 — (1,304,768 ) — The table below shows the remaining contractual maturities of repurchase agreements outstanding at June 30, 2018 and December 31, 2017 , in addition to the various types of marketable securities that have been pledged as collateral for these borrowings. Remaining Contractual Maturity of the Agreements (In thousands) Overnight and continuous Up to 90 days Greater than 90 days Total June 30, 2018 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 253,662 $ — $ 350,000 $ 603,662 Government-sponsored enterprise obligations 63,916 — — 63,916 Agency mortgage-backed securities 518,375 22,850 202,750 743,975 Non-agency mortgage-backed securities 10,591 — — 10,591 Asset-backed securities 56,335 75,000 — 131,335 Other debt securities 31,595 — — 31,595 Total repurchase agreements, gross amount recognized $ 934,474 $ 97,850 $ 552,750 $ 1,585,074 December 31, 2017 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 271,820 $ 1,731 $ 450,000 $ 723,551 Government-sponsored enterprise obligations 149,111 — — 149,111 Agency mortgage-backed securities 737,975 9,750 200,000 947,725 Asset-backed securities 89,601 30,000 — 119,601 Other debt securities 14,780 — — 14,780 Total repurchase agreements, gross amount recognized $ 1,263,287 $ 41,481 $ 650,000 $ 1,954,768

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2018
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company issues stock-based compensation in the form of nonvested restricted stock and stock appreciation rights (SARs). Most of the awards are issued during the first quarter of each year. The stock-based compensation expense that has been charged against income was $3.1 million in both the three months ended June 30, 2018 and 2017 , and $6.4 million and $6.2 million in the six months ended June 30, 2018 and 2017 , respectively. Nonvested stock awards generally vest in 4 to 7 years and contain restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant. A summary of the status of the Company’s nonvested share awards as of June 30, 2018 , and changes during the six month period then ended, is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2018 1,254,518 $38.67 Granted 225,764 59.23 Vested (344,830 ) 32.27 Forfeited (15,049 ) 45.88 Nonvested at June 30, 2018 1,120,403 $44.69 SARs are granted with exercise prices equal to the market price of the Company’s stock at the date of grant. SARs vest ratably over 4 years of continuous service and have 10 -year contractual terms. All SARs must be settled in stock under provisions of the plan. In determining compensation cost, the Black-Scholes option-pricing model is used to estimate the fair value of SARs on date of grant. The current year per share average fair value and the model assumptions are shown in the table below. Weighted per share average fair value at grant date $12.44 Assumptions: Dividend yield 1.6 % Volatility 20.6 % Risk-free interest rate 2.7 % Expected term 6.6 years A summary of SAR activity during the first six months of 2018 is presented below. (Dollars in thousands, except per share data) Rights Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2018 1,179,286 $37.13 Granted 168,716 58.42 Forfeited (8,856 ) 46.86 Expired (276 ) 43.52 Exercised (226,488 ) 29.82 Outstanding at June 30, 2018 1,112,382 $41.77 7.1 years $ 25,584

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers The Company adopted ASU 2014-09, "Revenue from Contracts with Customers", and its related amendments on January 1, 2018. The core principle of the new guidance is that an entity should recognize revenue to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For the six months ended June 30, 2018 , approximately 62% of the Company’s total revenue was comprised of net interest income, which is not within the scope of this guidance. Of the remaining revenue, those items that were subject to this guidance mainly included fees for bank card, trust, deposit account services and consumer brokerage services. The Company has concluded that the new guidance did not require any significant change to its revenue recognition processes. However, application of the new guidance resulted in a reclassification of certain bank card related network and rewards costs, previously classified as non-interest expense, to a reduction to non-interest income in the Company’s consolidated statements of income. The reclassification had no effect on prior period net income or net income per share. The Company adopted ASU 2014-09 on a full retrospective basis, in which each prior reporting period has been presented in accordance with the new guidance. The table below shows the effect of this reclassification on bank card fee income and non-interest expense for the three and six months ended June 30, 2017 . Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 44,999 $ (7,704 ) $ 37,295 $ 88,203 $ (15,157 ) $ 73,046 Total non-interest income 123,084 (7,704 ) 115,380 240,150 (15,157 ) 224,993 Non-interest expense: Data processing and software $ 23,356 $ (3,321 ) $ 20,035 $ 46,453 $ (6,513 ) $ 39,940 Other 19,761 (4,383 ) 15,378 39,725 (8,644 ) 31,081 Total non-interest expense 184,594 (7,704 ) 176,890 371,424 (15,157 ) 356,267 The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Bank card transaction fees $ 43,215 $ 37,295 $ 84,668 $ 73,046 Trust fees 37,036 33,120 73,098 65,134 Deposit account charges and other fees 23,893 22,861 46,875 44,803 Consumer brokerage services 3,971 3,726 7,739 7,375 Other non-interest income 6,852 8,570 14,163 16,167 Total non-interest income from contracts with customers 114,967 105,572 226,543 206,525 Other non-interest income (a) 9,883 9,808 17,997 18,468 Total non-interest income $ 124,850 $ 115,380 $ 244,540 $ 224,993 (a) This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions. The following table presents the opening and closing receivable balances for the six month periods ended June 30, 2018 and 2017 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) June 30, 2018 December 31, 2017 June 30, 2017 December 31, 2016 Bank card transaction fees $ 11,104 $ 13,315 $ 10,878 $ 14,686 Trust fees 2,893 2,802 3,227 2,681 Deposit account charges and other fees 5,773 5,597 5,471 5,735 Consumer brokerage services 924 380 345 309 For these revenue categories, none of the transaction price has been allocated to performance obligations that are unsatisfied as of the end of a reporting period. A description of these revenue categories follows. Bank Card Transaction Fees The following table presents the components of bank card fee income. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Debit card: Fee income $ 10,582 $ 10,325 $ 20,344 $ 19,966 Expense for network charges (375 ) (1,921 ) (746 ) (3,571 ) Net debit card fees 10,207 8,404 19,598 16,395 Credit card: Fee income 6,800 6,483 12,845 12,223 Expense for network charges and rewards (3,304 ) (2,923 ) (6,248 ) (5,669 ) Net credit card fees 3,496 3,560 6,597 6,554 Corporate card: Fee income 49,141 43,261 97,017 85,680 Expense for network charges and rewards (24,521 ) (23,365 ) (48,229 ) (45,820 ) Net corporate card fees 24,620 19,896 48,788 39,860 Merchant: Fee income 7,606 8,350 14,907 16,289 Fees to cardholder banks (1,878 ) (2,080 ) (3,603 ) (4,169 ) Expense for network charges (836 ) (835 ) (1,619 ) (1,883 ) Net merchant fees 4,892 5,435 9,685 10,237 Total bank card transaction fees $ 43,215 $ 37,295 $ 84,668 $ 73,046 The majority of debit and credit card fees are reported in the Consumer segment, while corporate card and merchant fees are reported in the Commercial segment. Debit and Credit Card Fees The Company issues debit and credit cards to its retail and commercial banking customers who use the cards to purchase goods and services from merchants through an electronic payment system. As a card issuer, the Company earns fees, including interchange income, for processing the cardholder’s purchase transaction with a merchant through a settlement network. Purchases are charged directly to a customer’s checking account (in the case of a debit card), or are posted to a customer’s credit card account. The fees earned are established by the settlement network and are dependent on the type of transaction processed but are typically based on a per unit charge. Interchange income, the largest component of debit and credit card fees, is settled daily through the networks. The services provided to the cardholders include issuing and maintaining cards, settling purchases with merchants, and maintaining memberships in various card networks to facilitate processing. These services are considered one performance obligation as one of the services would not be performed without the others. The performance obligation is satisfied as services are rendered for each purchase transaction, and income is immediately recognized. In order to participate in the settlement network process, the Company must pay various transaction-related costs, established by the networks, including membership fees and a per unit charge for each transaction. These expenses are recorded net of the card fees earned. Consumer credit card products offer cardholders rewards that can be later redeemed for cash or goods or services to encourage card usage. Reward programs must meet network requirements based on the type of card issued. The expense associated with the rewards granted are recorded net of the credit card fees earned. Commercial card products offer cash rewards to corporate cardholders to encourage card usage in facilitating corporate payments. The Company pays cash rewards based on contractually agreed upon amounts, normally as a percent of each sales transaction. The expense associated with the cash rewards program is recorded net of the corporate card fees earned. Merchant Fees The Company offers merchant processing services to its business customers to enable them to accept credit and debit card payments. Merchant processing activities include gathering merchant sales information, authorizing sales transactions and collecting the funds from card issuers using the networks. The merchant is charged a merchant discount fee for the services based on agreed upon pricing between the merchant and the Company. Merchant fees are recorded net of outgoing interchange costs paid to the card issuing banks and net of other network costs as show in the table above. Merchant services provided are considered one performance obligation as one of the services would not be performed without the others. The performance obligation is satisfied as services are rendered for each settlement transaction and income is immediately recognized. Income earned from merchant fees settles with the customer according to terms negotiated in individual customer contracts. The majority of customers settle with the Company at least monthly. Trust Fees The following table shows the components of revenue within trust fees. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Private client $ 27,987 $ 24,701 $ 54,855 $ 48,463 Institutional 7,271 6,751 14,682 13,245 Other 1,778 1,668 3,561 3,426 Total trust fees $ 37,036 $ 33,120 $ 73,098 $ 65,134 This revenue is reported in the Wealth segment. The Company provides trust and asset management services to both private client and institutional trust customers including asset custody, investment advice, and reporting and administrative services. Other specialized services such as tax preparation, financial planning, representation and other related services are provided as needed. Trust fees are generally earned monthly and billed based on a rate multiplied by the fair value of the customer trust assets. The majority of customer trust accounts are billed monthly. However, some accounts are billed quarterly, and a small number of accounts are billed semi-annually or annually, in accordance with agreements in place with the customer. The Company accrues trust fees monthly based on an estimate of fees due and either directly charges the customer’s account the following month or invoices the customer for fees due. The Company maintains written product pricing information which is used to bill each trust customer based on the services provided. Providing trust services is considered to be a single performance obligation that is satisfied on a monthly basis, involving the monthly custody of customer assets, statement rendering, periodic investment advice where applicable, and other specialized services as needed. As such, performance obligations are considered to be satisfied at the conclusion of each month while trust fee income is also recorded monthly. Deposit Account Charges and Other Fees The following table shows the components of revenue within deposit account charges and other fees. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Corporate cash management fees $ 10,095 $ 9,477 $ 19,492 $ 18,388 Overdraft and return item fees 7,656 7,448 15,168 14,628 Other service charges on deposit accounts 6,142 5,936 12,215 11,787 Total deposit account charges and other fees $ 23,893 $ 22,861 $ 46,875 $ 44,803 Approximately half of this revenue is reported in the Consumer segment, while the remainder is reported in the Commercial segment. The Company provides corporate cash management services to its business and non-profit customers to meet their various transaction processing needs. Such services include deposit and check processing, lockbox, remote deposit, reconciliation, on-line banking and other similar transaction processing services. The Company maintains unit prices for each type of service, and the customer is billed based on transaction volumes processed monthly. The customer is usually billed either monthly or quarterly, however, some customers may be billed semi-annually or annually. The customer may pay for the cash management services provided either by paying in cash or using the value of deposit balances (formula provided to the customer) held at the Company. The Company’s performance obligation for corporate cash management services is the processing of items over a monthly term, and the obligations are satisfied at the conclusion of each month. Overdraft fees are charged to customers when daily checks and other withdrawals to customers’ accounts exceed balances on hand. Fees are based on a unit price multiplied by the number of items processed whose total amounts exceed the available account balance. The daily overdraft charge is calculated and the fee is posted to the customer’s account each day. The Company’s performance obligations for overdraft transactions is based on the daily transaction processed and the obligation is satisfied as each day’s transaction processing is concluded. Other deposit fees include numerous smaller fees such as monthly statement fees, foreign ATM processing fees, identification restoration fees, and stop payment fees. Such fees are mostly billed to customers directly on their monthly deposit account statements, or in the case of ATM fees, the fee is charged to the customer on the day that transactions are processed. Performance obligations for all of these various services are satisfied at the time that the service is rendered. Consumer Brokerage Services The following shows the components of revenue within consumer brokerage services. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Commission income $ 2,269 $ 2,193 $ 4,361 $ 4,423 Managed account services 1,702 1,533 3,378 2,952 Total consumer brokerage services $ 3,971 $ 3,726 $ 7,739 $ 7,375 Nearly all of this revenue is reported in the Company's Wealth segment. Consumer brokerage services revenue is comprised of commissions received upon the execution of purchases and sales of mutual fund shares and equity securities, in addition to sales of annuities and certain limited insurance products in an agency capacity. Also, fees are earned on professionally managed advisory programs through arrangements with sub-advisors. Payment from the customer is due upon settlement date for purchases and sales of securities, at the purchase date for annuities and insurance products, and upon inception of the service period for advisory programs. Most of the contracts (except advisory contracts) encompass two types of performance obligations. The first is an obligation to provide account maintenance, record keeping and custodial services throughout the contract term. The second is the obligation to provide trade execution services for the customers' purchases and sales of products mentioned above. The first obligation is satisfied over time as the service period elapses, while the second type of obligation is satisfied upon the execution of each purchase/sale transaction. Contracts for advisory services contain a single performance obligation comprised of providing the management services and related reporting/administrative services over the contract term. The transaction price of the contracts (except advisory contracts) is a commission charged at the time of trade execution. The commission varies across different security types, insurance products and mutual funds. It is generally determined by standardized price lists published by the Company and its mutual fund and insurance vendors. Because the transaction price relates specifically to the trade execution, it has been allocated to that performance obligation and is recorded at the time of execution. The fee for advisory services is charged to the customer in advance of the quarterly service period, based on the account balance at the beginning of the period. Revenue is recognized ratably over the service period. Other Non-Interest Income from Contracts with Customers Other non-interest income consists mainly of various customer deposit related fees such as ATM fees and gains on sales of tax credits, foreclosed assets, and bank premises and equipment. Performance obligations for these services consist mainly of the execution of transactions for sales of various properties or providing specific deposit related transactions. Fees from these revenue sources are recognized when the performance obligation is completed, at which time cash is received by the Company.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Measurements [Abstract]
Fair Value Measurements	Fair Value Measurements The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as available for sale debt securities, equity securities, trading debt securities, certain investments relating to private equity activities, and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as mortgage servicing rights and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or fair value accounting or write-downs of individual assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value. For accounting disclosure purposes, a three-level valuation hierarchy of fair value measurements has been established. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1 – inputs to the valuation methodology are quoted prices for identical assets or liabilities in active markets. • Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds). • Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company’s best information and assumptions that a market participant would consider. The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in the Fair Value Measurements note in the Company's 2017 Annual Report on Form 10-K. There have been no significant changes in these methodologies since then. Instruments Measured at Fair Value on a Recurring Basis The table below presents the June 30, 2018 and December 31, 2017 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first six months of 2018 or the year ended December 31, 2017 . Fair Value Measurements Using (In thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2018 Assets: Residential mortgage loans held for sale $ 10,750 $ — $ 10,750 $ — Available for sale debt securities: U.S. government and federal agency obligations 911,092 911,092 — — Government-sponsored enterprise obligations 311,361 — 311,361 — State and municipal obligations 1,379,164 — 1,364,091 15,073 Agency mortgage-backed securities 3,131,025 — 3,131,025 — Non-agency mortgage-backed securities 1,010,331 — 1,010,331 — Asset-backed securities 1,338,542 — 1,338,542 — Other debt securities 330,861 — 330,861 — Trading debt securities 31,156 — 31,156 — Equity securities 2,741 2,741 — — Private equity investments 68,940 — — 68,940 Derivatives * 6,239 — 5,488 751 Assets held in trust for deferred compensation plan 13,790 13,790 — — Total assets 8,545,992 927,623 7,533,605 84,764 Liabilities: Derivatives * 19,846 — 19,779 67 Liabilities held in trust for deferred compensation plan 13,790 13,790 — — Total liabilities $ 33,636 $ 13,790 $ 19,779 $ 67 December 31, 2017 Assets: Residential mortgage loans held for sale $ 15,327 $ — $ 15,327 $ — Available for sale debt securities: U.S. government and federal agency obligations 917,147 917,147 — — Government-sponsored enterprise obligations 406,363 — 406,363 — State and municipal obligations 1,611,366 — 1,594,350 17,016 Agency mortgage-backed securities 3,040,913 — 3,040,913 — Non-agency mortgage-backed securities 905,793 — 905,793 — Asset-backed securities 1,492,800 — 1,492,800 — Other debt securities 351,060 — 351,060 — Trading debt securities 18,269 — 18,269 — Equity securities 48,838 19,864 28,974 — Private equity investments 55,752 — — 55,752 Derivatives * 8,349 — 7,723 626 Assets held in trust for deferred compensation plan 12,843 12,843 — — Total assets 8,884,820 949,854 7,861,572 73,394 Liabilities: Derivatives * 8,074 — 7,951 123 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — Total liabilities $ 20,917 $ 12,843 $ 7,951 $ 123 * The fair value of each class of derivative is shown in Note 10. The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (In thousands) State and Municipal Obligations Private Equity Investments Derivatives Total For the three months ended June 30, 2018 Balance March 31, 2018 $ 17,158 $ 64,951 $ 520 $ 82,629 Total gains or losses (realized/unrealized): Included in earnings — 3,791 164 3,955 Included in other comprehensive income * (379 ) — — (379 ) Investment securities sold (1,715 ) — — (1,715 ) Discount accretion 9 — — 9 Purchases of private equity investments — 364 — 364 Sale/pay down of private equity investments — (166 ) — (166 ) Balance June 30, 2018 $ 15,073 $ 68,940 $ 684 $ 84,697 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 June 30, 2018 $ — $ 3,791 $ 747 $ 4,538 For the six months ended June 30, 2018 Balance January 1, 2018 $ 17,016 $ 55,752 $ 503 $ 73,271 Total gains or losses (realized/unrealized): Included in earnings — 8,096 329 8,425 Included in other comprehensive income * (246 ) — — (246 ) Investment securities sold (1,715 ) — — (1,715 ) Discount accretion 18 — — 18 Purchases of private equity investments — 5,243 — 5,243 Sale/pay down of private equity investments — (186 ) — (186 ) Capitalized interest/dividends — 35 — 35 Sale of risk participation agreement — — (148 ) (148 ) Balance June 30, 2018 $ 15,073 $ 68,940 $ 684 $ 84,697 Total gains or losses for the six months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2018 $ — $ 8,096 $ 910 $ 9,006 For the three months ended June 30, 2017 Balance March 31, 2017 $ 17,083 $ 52,800 $ 822 $ 70,705 Total gains or losses (realized/unrealized): Included in earnings — 48 (31 ) 17 Included in other comprehensive income * 319 — — 319 Investment securities called (600 ) — — (600 ) Discount accretion 23 — — 23 Purchases of private equity investments — 2,259 — 2,259 Sale/pay down of private equity investments — (1,550 ) — (1,550 ) Balance June 30, 2017 $ 16,825 $ 53,557 $ 791 $ 71,173 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 June 30, 2017 $ — $ 48 $ 872 $ 920 For the six months ended June 30, 2017 Balance January 1, 2017 $ 16,682 $ 50,820 $ 258 $ 67,760 Total gains or losses (realized/unrealized): Included in earnings — (2,830 ) 533 (2,297 ) Included in other comprehensive income * 710 — — 710 Investment securities called (600 ) — — (600 ) Discount accretion 33 — — 33 Purchases of private equity investments — 7,084 — 7,084 Sale/pay down of private equity investments — (1,550 ) — (1,550 ) Capitalized interest/dividends — 33 — 33 Balance June 30, 2017 $ 16,825 $ 53,557 $ 791 $ 71,173 Total gains or losses for the six months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2017 $ — $ (2,655 ) $ 882 $ (1,773 ) * 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 June 30, 2018 Total gains or losses included in earnings $ 147 $ 17 $ 3,791 $ 3,955 Change in unrealized gains or losses relating to assets still held at June 30, 2018 $ 730 $ 17 $ 3,791 $ 4,538 For the six months ended June 30, 2018 Total gains or losses included in earnings $ 149 $ 180 $ 8,096 $ 8,425 Change in unrealized gains or losses relating to assets still held at June 30, 2018 $ 730 $ 180 $ 8,096 $ 9,006 For the three months ended June 30, 2017 Total gains or losses included in earnings $ (32 ) $ 1 $ 48 $ 17 Change in unrealized gains or losses relating to assets still held at June 30, 2017 $ 871 $ 1 $ 48 $ 920 For the six months ended June 30, 2017 Total gains or losses included in earnings $ 522 $ 11 $ (2,830 ) $ (2,297 ) Change in unrealized gains or losses relating to assets still held at June 30, 2017 $ 871 $ 11 $ (2,655 ) $ (1,773 ) Level 3 Inputs The Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $15.1 million at June 30, 2018 , while private equity investments, included in other securities, totaled $68.9 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 5 years Estimated market rate 3.7% - 5.9% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 50.5% - 98.8% 80.4% Embedded servicing value .5% - 2.4% 1.3% Instruments Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis during the first six months of 2018 and 2017 , and still held as of June 30, 2018 and 2017 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at June 30, 2018 and 2017 . Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Gains (Losses) Recognized During the Six Months Ended June 30 June 30, 2018 Collateral dependent impaired loans $ 175 $ — $ — $ 175 $ (118 ) Mortgage servicing rights 5,463 — — 5,463 9 Foreclosed assets 47 — — 47 (47 ) Long-lived assets 914 — — 914 (552 ) June 30, 2017 Collateral dependent impaired loans $ 2,044 $ — $ — $ 2,044 $ (550 ) Mortgage servicing rights 3,646 — — 3,646 6 Foreclosed assets 75 — — 75 (58 ) Long-lived assets 1,834 — — 1,834 (343 )

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	6 Months Ended
	Jun. 30, 2018
Fair Value Of Financial Instruments [Abstract]
Fair Value Of Financial Instruments	Fair Value of Financial Instruments The carrying amounts and estimated fair values of financial instruments held by the Company are set forth below. Fair value estimates are made at a specific point in time based on relevant market information. They do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for many of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, risk characteristics and economic conditions. These estimates are subjective, involve uncertainties, and cannot be determined with precision. Changes in assumptions could significantly affect the estimates. As mentioned in Note 3, the Company prospectively adopted ASU 2016-01 on January 1, 2018. In accordance with its requirements, the fair value of loans as of June 30, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion. The estimated fair values of the Company’s financial instruments and the classification of their fair value measurement within the valuation hierarchy are as follows at June 30, 2018 and December 31, 2017 : Carrying Amount Estimated Fair Value at June 30, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,990,298 $ — $ — $ 4,890,517 $ 4,890,517 Real estate - construction and land 967,151 — — 962,276 962,276 Real estate - business 2,727,580 — — 2,689,312 2,689,312 Real estate - personal 2,102,586 — — 2,038,381 2,038,381 Consumer 2,012,644 — — 1,976,911 1,976,911 Revolving home equity 374,557 — — 367,886 367,886 Consumer credit card 775,214 — — 720,044 720,044 Overdrafts 4,081 — — 3,018 3,018 Total loans 13,954,111 — — 13,648,345 13,648,345 Loans held for sale 20,352 — 20,352 — 20,352 Investment securities 8,560,285 913,833 7,517,367 129,085 8,560,285 Federal funds sold 31,500 31,500 — — 31,500 Securities purchased under agreements to resell 700,000 — — 680,830 680,830 Interest earning deposits with banks 114,947 114,947 — — 114,947 Cash and due from banks 386,339 386,339 — — 386,339 Derivative instruments 6,239 — 5,488 751 6,239 Assets held in trust for deferred compensation plan 13,790 13,790 — — 13,790 Total $ 23,787,563 $ 1,460,409 $ 7,543,207 $ 14,459,011 $ 23,462,627 Financial Liabilities Non-interest bearing deposits $ 6,876,756 $ 6,876,756 $ — $ — $ 6,876,756 Savings, interest checking and money market deposits 11,761,832 11,761,832 — — 11,761,832 Time open and certificates of deposit 1,682,969 — — 1,682,894 1,682,894 Federal funds purchased 131,685 131,685 — — 131,685 Securities sold under agreements to repurchase 1,035,074 — — 1,035,558 1,035,558 Other borrowings 9,291 — 7,682 1,609 9,291 Derivative instruments 19,846 — 19,779 67 19,846 Liabilities held in trust for deferred compensation plan 13,790 13,790 — — 13,790 Total $ 21,531,243 $ 18,784,063 $ 27,461 $ 2,720,128 $ 21,531,652 Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,958,554 $ — $ — $ 4,971,401 $ 4,971,401 Real estate - construction and land 968,820 — — 979,389 979,389 Real estate - business 2,697,452 — — 2,702,598 2,702,598 Real estate - personal 2,062,787 — — 2,060,443 2,060,443 Consumer 2,104,487 — — 2,074,129 2,074,129 Revolving home equity 400,587 — — 400,333 400,333 Consumer credit card 783,864 — — 798,093 798,093 Overdrafts 7,123 — — 7,123 7,123 Total loans 13,983,674 — — 13,993,509 13,993,509 Loans held for sale 21,398 — 21,398 — 21,398 Investment securities 8,893,307 937,011 7,838,522 117,774 8,893,307 Federal funds sold 42,775 42,775 — — 42,775 Securities purchased under agreements to resell 700,000 — — 695,194 695,194 Interest earning deposits with banks 30,631 30,631 — — 30,631 Cash and due from banks 438,439 438,439 — — 438,439 Derivative instruments 8,349 — 7,723 626 8,349 Assets held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 24,131,416 $ 1,461,699 $ 7,867,643 $ 14,807,103 $ 24,136,445 Financial Liabilities Non-interest bearing deposits $ 7,158,962 $ 7,158,962 $ — $ — $ 7,158,962 Savings, interest checking and money market deposits 11,499,620 11,499,620 — — 11,499,620 Time open and certificates of deposit 1,766,864 — — 1,768,780 1,768,780 Federal funds purchased 202,370 202,370 — — 202,370 Securities sold under agreements to repurchase 1,304,768 — — 1,305,375 1,305,375 Other borrowings 1,758 — — 1,758 1,758 Derivative instruments 8,074 — 7,951 123 8,074 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 21,955,259 $ 18,873,795 $ 7,951 $ 3,076,036 $ 21,957,782

Legal and Regulatory Proceeding

Legal and Regulatory Proceedings (Notes)	6 Months Ended
	Jun. 30, 2018
Legal Proceedings [Abstract]
Legal Matters and Contingencies [Text Block]	Legal and Regulatory Proceedings The Company has various legal proceedings pending at June 30, 2018 , arising in the normal course of business. While some matters pending against the Company specify damages claimed by plaintiffs, others do not seek a specified amount of damages or are at very early stages of the legal process. The Company records a loss accrual for all legal and regulatory matters for which it deems a loss is probable and can be reasonably estimated. Some matters, which are in the early stages, have not yet progressed to the point where a loss amount can be determined to be probable and estimable.

Loans And Allowance For Loan 26

Loans And Allowance For Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2018
Loans And Allowance For Loan Losses [Abstract]
Summary Classification Of Held To Maturity Loan Portfolio	Major classifications within the Company’s held for investment loan portfolio at June 30, 2018 and December 31, 2017 are as follows: (In thousands) June 30, 2018 December 31, 2017 Commercial: Business $ 4,990,298 $ 4,958,554 Real estate – construction and land 967,151 968,820 Real estate – business 2,727,580 2,697,452 Personal Banking: Real estate – personal 2,102,586 2,062,787 Consumer 2,012,644 2,104,487 Revolving home equity 374,557 400,587 Consumer credit card 775,214 783,864 Overdrafts 4,081 7,123 Total loans $ 13,954,111 $ 13,983,674
Summary Of Activity In The Allowance For Loan Losses	A summary of the activity in the allowance for loan losses during the three and six months ended June 30, 2018 and 2017 , respectively, follows: For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) Commercial Personal Banking Total Commercial Personal Banking Total Balance at beginning of period $ 93,065 $ 66,467 $ 159,532 $ 93,704 $ 65,828 $ 159,532 Provision 485 9,558 10,043 (409 ) 20,848 20,439 Deductions: Loans charged off 362 13,323 13,685 728 26,688 27,416 Less recoveries on loans 663 2,979 3,642 1,284 5,693 6,977 Net loan charge-offs (recoveries) (301 ) 10,344 10,043 (556 ) 20,995 20,439 Balance June 30, 2018 $ 93,851 $ 65,681 $ 159,532 $ 93,851 $ 65,681 $ 159,532 Balance at beginning of period $ 92,951 $ 64,881 $ 157,832 $ 91,361 $ 64,571 $ 155,932 Provision (111 ) 10,869 10,758 1,002 20,884 21,886 Deductions: Loans charged off 531 13,415 13,946 1,077 25,745 26,822 Less recoveries on loans 430 2,758 3,188 1,453 5,383 6,836 Net loan charge-offs (recoveries) 101 10,657 10,758 (376 ) 20,362 19,986 Balance June 30, 2017 $ 92,739 $ 65,093 $ 157,832 $ 92,739 $ 65,093 $ 157,832
Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology	The following table shows the balance in the allowance for loan losses and the related loan balance at June 30, 2018 and December 31, 2017 , disaggregated on the basis of impairment methodology. Impaired loans evaluated under Accounting Standards Codification (ASC) 310-10-35 include loans on non-accrual status, which are individually evaluated for impairment, and other impaired loans discussed below, which are deemed to have similar risk characteristics and are collectively evaluated. All other loans are collectively evaluated for impairment under ASC 450-20. Impaired Loans All Other Loans (In thousands) Allowance for Loan Losses Loans Outstanding Allowance for Loan Losses Loans Outstanding June 30, 2018 Commercial $ 2,631 $ 90,724 $ 91,220 $ 8,594,305 Personal Banking 919 18,172 64,762 5,250,910 Total $ 3,550 $ 108,896 $ 155,982 $ 13,845,215 December 31, 2017 Commercial $ 3,067 $ 92,613 $ 90,637 $ 8,532,213 Personal Banking 1,176 22,182 64,652 5,336,666 Total $ 4,243 $ 114,795 $ 155,289 $ 13,868,879
Investment In Impaired Loans	The table below shows the Company’s investment in impaired loans at June 30, 2018 and December 31, 2017 . These loans consist of all loans on non-accrual status and other restructured loans whose terms have been modified and classified as troubled debt restructurings. These restructured loans are performing in accordance with their modified terms, and because the Company believes it probable that all amounts due under the modified terms of the agreements will be collected, interest on these loans is being recognized on an accrual basis. They are discussed further in the "Troubled debt restructurings" section on page 15. (In thousands) June 30, 2018 Dec. 31, 2017 Non-accrual loans $ 9,472 $ 11,983 Restructured loans (accruing) 99,424 102,812 Total impaired loans $ 108,896 $ 114,795
Additional Information About Impaired Loans Held	The following table provides additional information about impaired loans held by the Company at June 30, 2018 and December 31, 2017 , segregated between loans for which an allowance for credit losses has been provided and loans for which no allowance has been provided. (In thousands) Recorded Investment Unpaid Principal Balance Related Allowance June 30, 2018 With no related allowance recorded: Business $ 4,946 $ 8,936 $ — Real estate – business 1,210 1,300 — $ 6,156 $ 10,236 $ — With an allowance recorded: Business $ 70,871 $ 71,157 $ 2,090 Real estate – construction and land 1,342 1,346 39 Real estate – business 12,355 12,928 502 Real estate – personal 5,707 8,134 295 Consumer 5,464 5,464 52 Revolving home equity 114 114 11 Consumer credit card 6,887 6,887 561 $ 102,740 $ 106,030 $ 3,550 Total $ 108,896 $ 116,266 $ 3,550 December 31, 2017 With no related allowance recorded: Business $ 5,356 $ 9,000 $ — Real estate – business 1,299 1,303 — Consumer 779 817 — $ 7,434 $ 11,120 $ — With an allowance recorded: Business $ 72,589 $ 73,168 $ 2,455 Real estate – construction and land 837 841 27 Real estate – business 12,532 13,071 585 Real estate – personal 9,126 11,914 532 Consumer 5,388 5,426 67 Revolving home equity 204 204 11 Consumer credit card 6,685 6,685 566 $ 107,361 $ 111,309 $ 4,243 Total $ 114,795 $ 122,429 $ 4,243
Total Average Impaired Loans	Total average impaired loans for the three and six month periods ended June 30, 2018 and 2017 , respectively, are shown in the table below. (In thousands) Commercial Personal Banking Total Average Impaired Loans: For the three months ended June 30, 2018 Non-accrual loans $ 7,676 $ 2,005 $ 9,681 Restructured loans (accruing) 81,832 17,122 98,954 Total $ 89,508 $ 19,127 $ 108,635 For the six months ended June 30, 2018 Non-accrual loans $ 8,097 $ 2,464 $ 10,561 Restructured loans (accruing) 80,552 17,943 98,495 Total $ 88,649 $ 20,407 $ 109,056 For the three months ended June 30, 2017 Non-accrual loans $ 9,867 $ 4,539 $ 14,406 Restructured loans (accruing) 34,765 15,780 50,545 Total $ 44,632 $ 20,319 $ 64,951 For the six months ended June 30, 2017 Non-accrual loans $ 10,238 $ 4,027 $ 14,265 Restructured loans (accruing) 33,333 15,991 49,324 Total $ 43,571 $ 20,018 $ 63,589
Interest Income Recognized On Impaired Loans	The table below shows interest income recognized during the three and six month periods ended June 30, 2018 and 2017 , respectively, for impaired loans held at the end of each period. This interest all relates to accruing restructured loans, as discussed in the "Troubled debt restructurings" section on page 15. For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Interest income recognized on impaired loans: Business $ 821 $ 319 $ 1,641 $ 637 Real estate – construction and land 22 1 44 2 Real estate – business 147 88 294 175 Real estate – personal 52 36 103 71 Consumer 82 80 164 159 Revolving home equity 1 6 2 12 Consumer credit card 159 145 317 289 Total $ 1,284 $ 675 $ 2,565 $ 1,345
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 June 30, 2018 and December 31, 2017 . (In thousands) Current or Less Than 30 Days Past Due 30 – 89 Days Past Due 90 Days Past Due and Still Accruing Non-accrual Total June 30, 2018 Commercial: Business $ 4,983,337 $ 1,404 $ 443 $ 5,114 $ 4,990,298 Real estate – construction and land 963,654 3,492 — 5 967,151 Real estate – business 2,718,888 6,227 — 2,465 2,727,580 Personal Banking: Real estate – personal 2,092,350 7,155 1,193 1,888 2,102,586 Consumer 1,985,195 25,096 2,353 — 2,012,644 Revolving home equity 372,865 708 984 — 374,557 Consumer credit card 758,230 8,504 8,480 — 775,214 Overdrafts 3,731 350 — — 4,081 Total $ 13,878,250 $ 52,936 $ 13,453 $ 9,472 $ 13,954,111 December 31, 2017 Commercial: Business $ 4,949,148 $ 3,085 $ 374 $ 5,947 $ 4,958,554 Real estate – construction and land 967,321 1,473 21 5 968,820 Real estate – business 2,694,234 482 — 2,736 2,697,452 Personal Banking: Real estate – personal 2,050,787 6,218 3,321 2,461 2,062,787 Consumer 2,067,025 32,674 3,954 834 2,104,487 Revolving home equity 397,349 1,962 1,276 — 400,587 Consumer credit card 764,568 10,115 9,181 — 783,864 Overdrafts 6,840 283 — — 7,123 Total $ 13,897,272 $ 56,292 $ 18,127 $ 11,983 $ 13,983,674
Credit Quality Of Commercial Loan Portfolio	The following table provides information about the credit quality of the Commercial loan portfolio, using the Company’s internal rating system as an indicator. The internal rating system is a series of grades reflecting management’s risk assessment, based on its analysis of the borrower’s financial condition. The “pass” category consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the “pass” category is monitored for early identification of credit deterioration. The “special mention” rating is applied to loans where the borrower exhibits negative financial trends due to borrower specific or systemic conditions that, if left uncorrected, threaten its capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. It is a transitional grade that is closely monitored for improvement or deterioration. The “substandard” rating is applied to loans where the borrower exhibits well-defined weaknesses that jeopardize its continued performance and are of a severity that the distinct possibility of default exists. Loans are placed on “non-accrual” when management does not expect to collect payments consistent with acceptable and agreed upon terms of repayment. Commercial Loans (In thousands) Business Real Estate-Construction Real Estate- Business Total June 30, 2018 Pass $ 4,771,613 $ 954,492 $ 2,648,144 $ 8,374,249 Special mention 58,771 10,501 33,791 103,063 Substandard 154,800 2,153 43,180 200,133 Non-accrual 5,114 5 2,465 7,584 Total $ 4,990,298 $ 967,151 $ 2,727,580 $ 8,685,029 December 31, 2017 Pass $ 4,740,013 $ 955,499 $ 2,593,005 $ 8,288,517 Special mention 59,177 10,614 50,577 120,368 Substandard 153,417 2,702 51,134 207,253 Non-accrual 5,947 5 2,736 8,688 Total $ 4,958,554 $ 968,820 $ 2,697,452 $ 8,624,826
Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding	For the remainder of loans in the Personal Banking portfolio, the table below shows the percentage of balances outstanding at June 30, 2018 and December 31, 2017 by FICO score. Personal Banking Loans % of Loan Category Real Estate - Personal Consumer Revolving Home Equity Consumer Credit Card June 30, 2018 FICO score: Under 600 1.1 % 3.2 % .8 % 4.6 % 600 - 659 2.0 5.1 1.6 14.1 660 - 719 10.0 18.0 9.2 35.3 720 - 779 23.6 23.6 22.1 26.4 780 and over 63.3 50.1 66.3 19.6 Total 100.0 % 100.0 % 100.0 % 100.0 % December 31, 2017 FICO score: Under 600 1.3 % 3.3 % 1.1 % 4.7 % 600 - 659 2.1 5.5 1.7 14.4 660 - 719 10.5 17.3 9.5 34.4 720 - 779 25.6 26.8 21.4 26.0 780 and over 60.5 47.1 66.3 20.5 Total 100.0 % 100.0 % 100.0 % 100.0 %
Outstanding Balance Of Loans Classified As Troubled Debt Restructurings	at June 30, 2018 , in addition to the outstanding balances of these restructured loans which the Company considers to have been in default at any time during the past twelve months. For purposes of this disclosure, the Company considers "default" to mean 90 days or more past due as to interest or principal. (In thousands) June 30, 2018 Balance 90 days past due at any time during previous 12 months Commercial: Business $ 75,680 $ 32 Real estate - construction and land 1,337 — Real estate - business 12,311 — Personal Banking: Real estate - personal 4,787 303 Consumer 5,464 115 Revolving home equity 114 42 Consumer credit card 6,887 577 Total troubled debt restructurings $ 106,580 $ 1,069
Additional Information about Troubled Debt Restructurings [Table Text Block]	(In thousands) June 30, 2018 December 31, 2017 Accruing loans: Non-market interest rates $ 86,906 $ 88,588 Assistance programs 6,887 6,685 Bankruptcy non-affirmation 5,335 7,283 Other 296 256 Non-accrual loans 7,156 7,796 Total troubled debt restructurings $ 106,580 $ 110,608

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Investment Securities [Abstract]
Investment Securities, At Fair Value	June 30, 2018 December 31, 2017 Available for sale debt securities $ 8,412,376 $ 8,725,442 Trading debt securities 31,156 18,269 Equity securities: Readily determinable fair value 2,741 48,838 No readily determinable fair value 1,703 1,753 Other: Federal Reserve Bank stock 33,369 33,253 Federal Home Loan Bank stock 10,000 10,000 Private equity investments 68,940 55,752 Total investment securities $ 8,560,285 $ 8,893,307
Summary Of Available For Sale Investment Securities By Maturity Groupings	A summary of the available for sale debt securities by maturity groupings as of June 30, 2018 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as the FHLMC, FNMA, GNMA and FDIC, in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral. (In thousands) Amortized Cost Fair Value U.S. government and federal agency obligations: Within 1 year $ 52,660 $ 52,603 After 1 but within 5 years 645,431 634,819 After 5 but within 10 years 157,967 155,108 After 10 years 69,202 68,562 Total U.S. government and federal agency obligations 925,260 911,092 Government-sponsored enterprise obligations: Within 1 year 117,562 117,444 After 1 but within 5 years 121,584 119,743 After 5 but within 10 years 34,984 33,946 After 10 years 42,852 40,228 Total government-sponsored enterprise obligations 316,982 311,361 State and municipal obligations: Within 1 year 147,325 147,668 After 1 but within 5 years 598,663 600,688 After 5 but within 10 years 591,819 590,950 After 10 years 40,963 39,858 Total state and municipal obligations 1,378,770 1,379,164 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,194,764 3,131,025 Non-agency mortgage-backed securities 1,019,545 1,010,331 Asset-backed securities 1,351,461 1,338,542 Total mortgage and asset-backed securities 5,565,770 5,479,898 Other debt securities: Within 1 year 9,003 8,971 After 1 but within 5 years 257,704 252,151 After 5 but within 10 years 73,283 69,739 Total other debt securities 339,990 330,861 Total available for sale debt securities $ 8,526,772 $ 8,412,376
Available For Sale Securities Unrealized Gains And Losses By Security Type	For debt securities classified as available for sale, the following table shows the unrealized gains and losses (pre-tax) in AOCI, by security type. (In thousands) Amortized Cost Gross Gross Fair Value June 30, 2018 U.S. government and federal agency obligations $ 925,260 $ 503 $ (14,671 ) $ 911,092 Government-sponsored enterprise obligations 316,982 — (5,621 ) 311,361 State and municipal obligations 1,378,770 8,105 (7,711 ) 1,379,164 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,194,764 5,995 (69,734 ) 3,131,025 Non-agency mortgage-backed securities 1,019,545 6,232 (15,446 ) 1,010,331 Asset-backed securities 1,351,461 2,343 (15,262 ) 1,338,542 Total mortgage and asset-backed securities 5,565,770 14,570 (100,442 ) 5,479,898 Other debt securities 339,990 — (9,129 ) 330,861 Total $ 8,526,772 $ 23,178 $ (137,574 ) $ 8,412,376 December 31, 2017 U.S. government and federal agency obligations $ 917,494 $ 4,096 $ (4,443 ) $ 917,147 Government-sponsored enterprise obligations 408,266 26 (1,929 ) 406,363 State and municipal obligations 1,592,707 21,413 (2,754 ) 1,611,366 Mortgage and asset-backed securities: Agency mortgage-backed securities 3,046,701 17,956 (23,744 ) 3,040,913 Non-agency mortgage-backed securities 903,920 6,710 (4,837 ) 905,793 Asset-backed securities 1,495,380 2,657 (5,237 ) 1,492,800 Total mortgage and asset-backed securities 5,446,001 27,323 (33,818 ) 5,439,506 Other debt securities 350,988 1,250 (1,178 ) 351,060 Total $ 8,715,456 $ 54,108 $ (44,122 ) $ 8,725,442
Cash Flow Model Inputs Used To Calculate Credit Losses	ignificant inputs to the cash flow models used to calculate the credit losses on these securities at June 30, 2018 included the following: Significant Inputs Range Prepayment CPR 0% - 25% Projected cumulative default 13% - 52% Credit support 0% - 20% Loss severity 14% - 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 Six Months Ended June 30 (In thousands) 2018 2017 Cumulative OTTI credit losses at January 1 $ 14,199 $ 14,080 Credit losses on debt securities for which impairment was not previously recognized 58 46 Credit losses on debt securities for which impairment was previously recognized 10 274 Increase in expected cash flows that are recognized over remaining life of security (104 ) (146 ) Cumulative OTTI credit losses at June 30 $ 14,163 $ 14,254
Securities With Unrealized Losses And Length Of Impairment Period	ecurities with unrealized losses recorded in AOCI are shown in the table below, along with the length of the impairment period. Less than 12 months 12 months or longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses June 30, 2018 U.S. government and federal agency obligations $ 707,018 $ 12,156 $ 90,340 $ 2,515 $ 797,358 $ 14,671 Government-sponsored enterprise obligations 261,378 5,605 49,983 16 311,361 5,621 State and municipal obligations 458,880 5,700 51,863 2,011 510,743 7,711 Mortgage and asset-backed securities: Agency mortgage-backed securities 2,029,957 45,267 566,986 24,467 2,596,943 69,734 Non-agency mortgage-backed securities 773,890 12,076 134,679 3,370 908,569 15,446 Asset-backed securities 862,416 13,296 173,895 1,966 1,036,311 15,262 Total mortgage and asset-backed securities 3,666,263 70,639 875,560 29,803 4,541,823 100,442 Other debt securities 311,714 8,033 19,147 1,096 330,861 9,129 Total $ 5,405,253 $ 102,133 $ 1,086,893 $ 35,441 $ 6,492,146 $ 137,574 December 31, 2017 U.S. government and federal agency obligations $ 618,617 $ 4,443 $ — $ — $ 618,617 $ 4,443 Government-sponsored enterprise obligations 286,393 1,712 49,766 217 336,159 1,929 State and municipal obligations 282,843 1,752 49,339 1,002 332,182 2,754 Mortgage and asset-backed securities: Agency mortgage-backed securities 1,320,689 9,433 619,300 14,311 1,939,989 23,744 Non-agency mortgage-backed securities 577,017 2,966 153,813 1,871 730,830 4,837 Asset-backed securities 786,048 3,168 264,295 2,069 1,050,343 5,237 Total mortgage and asset-backed securities 2,683,754 15,567 1,037,408 18,251 3,721,162 33,818 Other debt securities 144,090 727 20,202 451 164,292 1,178 Total $ 4,015,697 $ 24,201 $ 1,156,715 $ 19,921 $ 5,172,412 $ 44,122
Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses	The following tables present proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings. For the Six Months Ended June 30 (In thousands) 2018 2017 Proceeds from sales of securities: Available for sale debt securities $ 152,541 $ 4,972 Equity securities 39,981 584 Other — 996 Total proceeds $ 192,522 $ 6,552 Investment securities gains (losses), net: Available for sale debt securities: Losses realized on called bonds $ — $ (254 ) Gains realized on sales 423 — Losses realized on sales — (22 ) Other-than-temporary impairment recognized on debt securities (68 ) (320 ) Equity securities: Gains realized on donations of securities — 4,315 Gains realized on sales 102 584 Losses realized on sales (8,917 ) — Fair value adjustments, net 2,699 — Other: Gains realized on sales — 58 Losses realized on sales — (652 ) Fair value adjustments, net 8,096 (2,830 ) Total investment securities gains, net $ 2,335 $ 879

Goodwill And Other Intangible28

Goodwill And Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Intangible Assets With Estimable Useful Lives	The following table presents information about the Company's intangible assets which have estimable useful lives. June 30, 2018 December 31, 2017 (In thousands) Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Gross Carrying Amount Accumulated Amortization Valuation Allowance Net Amount Amortizable intangible assets: Core deposit premium $ 31,270 $ (28,650 ) $ — $ 2,620 $ 31,270 $ (28,305 ) $ — $ 2,965 Mortgage servicing rights 8,996 (3,533 ) — 5,463 7,906 (3,244 ) (9 ) 4,653 Total $ 40,266 $ (32,183 ) $ — $ 8,083 $ 39,176 $ (31,549 ) $ (9 ) $ 7,618
Schedule of Estimated Annual Amortization Expense	he following table shows the estimated annual amortization expense for the next five fiscal years. This expense is based on existing asset balances and the interest rate environment as of June 30, 2018 . The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. (In thousands) 2018 $ 1,232 2019 1,094 2020 937 2021 816 2022 720
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 six month period ended June 30, 2018 are as follows: (In thousands) Goodwill Core Deposit Premium Mortgage Servicing Rights Balance January 1, 2018 $ 138,921 $ 2,965 $ 4,653 Originations — — 1,090 Amortization — (345 ) (289 ) Impairment reversal — — 9 Balance June 30, 2018 $ 138,921 $ 2,620 $ 5,463
Schedule Of Goodwill Allocated By Operating Segments	Goodwill allocated to the Company’s operating segments at June 30, 2018 and December 31, 2017 is shown below. (In thousands) Consumer segment $ 70,721 Commercial segment 67,454 Wealth segment 746 Total goodwill $ 138,921

Pension (Tables)

Pension (Tables)	6 Months Ended
	Jun. 30, 2018
Pension [Abstract]
Net Pension Cost	The amount of net pension cost is shown in the table below: For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Service cost - benefits earned during the period $ 152 $ 128 $ 305 $ 257 Interest cost on projected benefit obligation 951 973 1,901 1,946 Expected return on plan assets (1,438 ) (1,438 ) (2,875 ) (2,876 ) Amortization of prior service cost (67 ) (68 ) (135 ) (136 ) Amortization of unrecognized net loss 592 617 1,184 1,234 Net periodic pension cost $ 190 $ 212 $ 380 $ 425

Common Stock (Tables)

Common Stock (Tables)	6 Months Ended
	Jun. 30, 2018
Common Stock [Abstract]
Summary Of Components Used To Calculate Basic And Diluted Income Per Share	Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 12. For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands, except per share data) 2018 2017 2018 2017 Basic income per common share: Net income attributable to Commerce Bancshares, Inc. $ 110,330 $ 78,960 $ 211,314 $ 150,464 Less preferred stock dividends 2,250 2,250 4,500 4,500 Net income available to common shareholders 108,080 76,710 206,814 145,964 Less income allocated to nonvested restricted stock 1,139 943 2,260 1,888 Net income allocated to common stock $ 106,941 $ 75,767 $ 204,554 $ 144,076 Weighted average common shares outstanding 105,686 105,583 105,660 105,486 Basic income per common share $ 1.02 $ .71 $ 1.94 $ 1.36 Diluted income per common share: Net income available to common shareholders $ 108,080 $ 76,710 $ 206,814 $ 145,964 Less income allocated to nonvested restricted stock 1,136 941 2,254 1,883 Net income allocated to common stock $ 106,944 $ 75,769 $ 204,560 $ 144,081 Weighted average common shares outstanding 105,686 105,583 105,660 105,486 Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods 343 360 338 389 Weighted average diluted common shares outstanding 106,029 105,943 105,998 105,875 Diluted income per common share $ 1.01 $ .71 $ 1.93 $ 1.36

Accumulated Other Comprehensi31

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income	The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale debt securities. Unrealized gains and losses on debt securities for which an other-than-temporary impairment (OTTI) has been recorded in current earnings are shown separately below. The other component is the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. Unrealized Gains (Losses) on Securities (1) Pension Loss Total Accumulated Other Comprehensive Income (Loss) (In thousands) OTTI Other Balance January 1, 2018 $ 3,411 $ 30,326 $ (19,629 ) $ 14,108 ASU 2018-02 Reclassification of tax rate change 715 6,359 (4,142 ) 2,932 ASU 2016-01 Reclassification of unrealized gain on equity securities — (33,320 ) — (33,320 ) Other comprehensive loss before reclassifications to current earnings (173 ) (123,854 ) — (124,027 ) Amounts reclassified to current earnings from accumulated other comprehensive income 68 (424 ) 1,049 693 Current period other comprehensive income (loss), before tax (105 ) (124,278 ) 1,049 (123,334 ) Income tax (expense) benefit 27 31,068 (262 ) 30,833 Current period other comprehensive income (loss), net of tax (78 ) (93,210 ) 787 (92,501 ) Transfer of unrealized gain on securities for which impairment was not previously recognized 12 (12 ) — — Balance June 30, 2018 $ 4,060 $ (89,857 ) $ (22,984 ) $ (108,781 ) Balance January 1, 2017 $ 2,975 $ 27,328 $ (19,328 ) $ 10,975 Other comprehensive income (loss) before reclassifications to current earnings (44 ) 53,072 — 53,028 Amounts reclassified to current earnings from accumulated other comprehensive income 320 (4,293 ) 1,098 (2,875 ) Current period other comprehensive income, before tax 276 48,779 1,098 50,153 Income tax expense (105 ) (18,536 ) (417 ) (19,058 ) Current period other comprehensive income, net of tax 171 30,243 681 31,095 Transfer of unrealized gain on securities for which impairment was not previously recognized 24 (24 ) — — Balance June 30, 2017 $ 3,170 $ 57,547 $ (18,647 ) $ 42,070

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Schedule Of Financial Information By Segment	he following table presents selected financial information by segment and reconciliations of combined segment totals to consolidated totals. There were no material intersegment revenues among the three segments. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. If appropriate, these changes are reflected in prior year information presented below. (In thousands) Consumer Commercial Wealth Segment Totals Other/Elimination Consolidated Totals Three Months Ended June 30, 2018 Net interest income $ 73,471 $ 85,721 $ 11,857 $ 171,049 $ 39,910 $ 210,959 Provision for loan losses (10,409 ) 308 16 (10,085 ) 42 (10,043 ) Non-interest income 32,116 51,651 42,896 126,663 (1,813 ) 124,850 Investment securities losses, net — — — — (3,075 ) (3,075 ) Non-interest expense (72,095 ) (75,360 ) (30,254 ) (177,709 ) (4,151 ) (181,860 ) Income before income taxes $ 23,083 $ 62,320 $ 24,515 $ 109,918 $ 30,913 $ 140,831 Six Months Ended June 30, 2018 Net interest income $ 144,908 $ 167,816 $ 23,302 $ 336,026 $ 67,825 $ 403,851 Provision for loan losses (20,924 ) 488 (48 ) (20,484 ) 45 (20,439 ) Non-interest income 62,332 100,862 84,997 248,191 (3,651 ) 244,540 Investment securities gains, net — — — — 2,335 2,335 Non-interest expense (142,266 ) (148,158 ) (62,113 ) (352,537 ) (11,600 ) (364,137 ) Income before income taxes $ 44,050 $ 121,008 $ 46,138 $ 211,196 $ 54,954 $ 266,150 Three Months Ended June 30, 2017 Net interest income $ 69,274 $ 82,137 $ 11,934 $ 163,345 $ 19,462 $ 182,807 Provision for loan losses (10,802 ) 111 24 (10,667 ) (91 ) (10,758 ) Non-interest income 29,617 46,088 38,852 114,557 823 115,380 Investment securities gains, net — — — — 1,651 1,651 Non-interest expense (68,374 ) (72,134 ) (29,494 ) (170,002 ) (6,888 ) (176,890 ) Income before income taxes $ 19,715 $ 56,202 $ 21,316 $ 97,233 $ 14,957 $ 112,190 Six Months Ended June 30, 2017 Net interest income $ 136,628 $ 162,007 $ 23,778 $ 322,413 $ 38,667 $ 361,080 Provision for loan losses (20,464 ) 624 1 (19,839 ) (2,047 ) (21,886 ) Non-interest income 56,780 90,998 76,558 224,336 657 224,993 Investment securities gains, net — — — — 879 879 Non-interest expense (135,791 ) (142,499 ) (59,813 ) (338,103 ) (18,164 ) (356,267 ) Income before income taxes $ 37,153 $ 111,130 $ 40,524 $ 188,807 $ 19,992 $ 208,799

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instrument Detail [Abstract]
Schedule Of Notional Amounts Of Derivative Instruments	(In thousands) June 30, 2018 December 31, 2017 Interest rate swaps $ 1,891,877 $ 1,741,412 Interest rate caps 31,483 31,776 Credit risk participation agreements 152,402 133,488 Foreign exchange contracts 8,737 11,826 Mortgage loan commitments 21,653 17,110 Mortgage loan forward sale contracts 2,848 2,566 Forward TBA contracts 25,000 25,000 Total notional amount $ 2,134,000 $ 1,963,178
Schedule Of Fair Values Of Derivative Instruments	The fair values of the Company's derivative instruments, whose notional amounts are listed above, are shown in the table below. Information about the valuation methods used to determine fair value is provided in Note 15 on Fair Value Measurements in the 2017 Annual Report on Form 10-K. The Company's policy is to present its derivative assets and derivative liabilities on a gross basis in its consolidated balance sheets, and these are reported in other assets and other liabilities. However, in January 2017, a clearinghouse rule change required that variation margin on centrally cleared derivatives, formerly treated as collateral, be treated as settlements of derivative exposure. As a result, the fair values of the respective derivative contracts must be reduced by variation margin payments and reported as a single, net amount. Accordingly, at June 30, 2018 in the table below, the positive fair values of cleared swaps were reduced by $15.9 million and the negative fair values of cleared swaps were reduced by $1.5 million . At December 31, 2017, the positive fair values of cleared swaps were reduced by $4.5 million and the negative fair values of cleared swaps were reduced by $4.3 million . Asset Derivatives Liability Derivatives June 30, 2018 Dec. 31, 2017 June 30, 2018 Dec. 31, 2017 (In thousands ) Fair Value Fair Value Derivative instruments: Interest rate swaps $ 5,265 $ 7,674 $ (19,616 ) $ (7,857 ) Interest rate caps 20 16 (20 ) (16 ) Credit risk participation agreements 21 46 (67 ) (123 ) Foreign exchange contracts 194 21 (31 ) (40 ) Mortgage loan commitments 730 580 — — Mortgage loan forward sale contracts 8 8 (1 ) (7 ) Forward TBA contracts 1 4 (111 ) (31 ) Total $ 6,239 $ 8,349 $ (19,846 ) $ (8,074 )
Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income	The effects of derivative instruments on the consolidated statements of income are shown in the table below. Location of Gain or (Loss) Recognized in Income on Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended June 30 For the Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Derivative instruments: Interest rate swaps Other non-interest income $ 1,727 $ 456 $ 2,232 $ 599 Credit risk participation agreements Other non-interest income 16 1 180 11 Foreign exchange contracts Other non-interest income 173 (55 ) 182 (75 ) Mortgage loan commitments Loan fees and sales 148 (32 ) 149 522 Mortgage loan forward sale contracts Loan fees and sales 6 (4 ) 6 62 Forward TBA contracts Loan fees and sales (9 ) (160 ) 533 (258 ) Total $ 2,061 $ 206 $ 3,282 $ 861
Balance Sheet Offsetting, Derivatives [Table Text Block]	Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Available for Offset Collateral Received/Pledged Net Amount June 30, 2018 Assets: Derivatives subject to master netting agreements $ 5,338 $ — $ 5,338 $ (491 ) $ (2,114 ) $ 2,733 Derivatives not subject to master netting agreements 901 — 901 Total derivatives 6,239 — 6,239 Liabilities: Derivatives subject to master netting agreements $ 19,777 $ — $ 19,777 $ (491 ) $ (354 ) $ 18,932 Derivatives not subject to master netting agreements 69 — 69 Total derivatives 19,846 — 19,846 December 31, 2017 Assets: Derivatives subject to master netting agreements $ 7,726 $ — $ 7,726 $ (233 ) $ (824 ) $ 6,669 Derivatives not subject to master netting agreements 623 — 623 Total derivatives 8,349 — 8,349 Liabilities: Derivatives subject to master netting agreements $ 7,935 $ — $ 7,935 $ (233 ) $ (1,570 ) $ 6,132 Derivatives not subject to master netting agreements 139 — 139 Total derivatives 8,074 — 8,074

Resale and Repurchase Agreeme34

Resale and Repurchase Agreements (Tables)	6 Months Ended
	Jun. 30, 2018
Resale and Repurchase Agreements [Abstract]
Resale and Repurchase Agreements [Table Text Block]	Gross Amounts Not Offset in the Balance Sheet (In thousands) Gross Amount Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Available for Offset Securities Collateral Received/Pledged Net Amount June 30, 2018 Total resale agreements, subject to master netting arrangements $ 1,250,000 $ (550,000 ) $ 700,000 $ — $ (698,414 ) $ 1,586 Total repurchase agreements, subject to master netting arrangements 1,585,074 (550,000 ) 1,035,074 — (1,035,074 ) — December 31, 2017 Total resale agreements, subject to master netting arrangements $ 1,350,000 $ (650,000 ) $ 700,000 $ — $ (700,000 ) $ — Total repurchase agreements, subject to master netting arrangements 1,954,768 (650,000 ) 1,304,768 — (1,304,768 ) —
Schedule of Underlying Assets of Repurchase Agreements [Table Text Block]	Remaining Contractual Maturity of the Agreements (In thousands) Overnight and continuous Up to 90 days Greater than 90 days Total June 30, 2018 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 253,662 $ — $ 350,000 $ 603,662 Government-sponsored enterprise obligations 63,916 — — 63,916 Agency mortgage-backed securities 518,375 22,850 202,750 743,975 Non-agency mortgage-backed securities 10,591 — — 10,591 Asset-backed securities 56,335 75,000 — 131,335 Other debt securities 31,595 — — 31,595 Total repurchase agreements, gross amount recognized $ 934,474 $ 97,850 $ 552,750 $ 1,585,074 December 31, 2017 Repurchase agreements, secured by: U.S. government and federal agency obligations $ 271,820 $ 1,731 $ 450,000 $ 723,551 Government-sponsored enterprise obligations 149,111 — — 149,111 Agency mortgage-backed securities 737,975 9,750 200,000 947,725 Asset-backed securities 89,601 30,000 — 119,601 Other debt securities 14,780 — — 14,780 Total repurchase agreements, gross amount recognized $ 1,263,287 $ 41,481 $ 650,000 $ 1,954,768

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Share-based Compensation [Abstract]
Summary Of The Status Of Nonvested Share Awards	A summary of the status of the Company’s nonvested share awards as of June 30, 2018 , and changes during the six month period then ended, is presented below. Shares Weighted Average Grant Date Fair Value Nonvested at January 1, 2018 1,254,518 $38.67 Granted 225,764 59.23 Vested (344,830 ) 32.27 Forfeited (15,049 ) 45.88 Nonvested at June 30, 2018 1,120,403 $44.69
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The current year per share average fair value and the model assumptions are shown in the table below. Weighted per share average fair value at grant date $12.44 Assumptions: Dividend yield 1.6 % Volatility 20.6 % Risk-free interest rate 2.7 % Expected term 6.6 years
Summary Of SAR Activity	A summary of SAR activity during the first six months of 2018 is presented below. (Dollars in thousands, except per share data) Rights Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2018 1,179,286 $37.13 Granted 168,716 58.42 Forfeited (8,856 ) 46.86 Expired (276 ) 43.52 Exercised (226,488 ) 29.82 Outstanding at June 30, 2018 1,112,382 $41.77 7.1 years $ 25,584

Revenue from Contracts with C36

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Reclassification of Bank Card Transaction Fees [Table Text Block]	The Company has concluded that the new guidance did not require any significant change to its revenue recognition processes. However, application of the new guidance resulted in a reclassification of certain bank card related network and rewards costs, previously classified as non-interest expense, to a reduction to non-interest income in the Company’s consolidated statements of income. The reclassification had no effect on prior period net income or net income per share. The Company adopted ASU 2014-09 on a full retrospective basis, in which each prior reporting period has been presented in accordance with the new guidance. The table below shows the effect of this reclassification on bank card fee income and non-interest expense for the three and six months ended June 30, 2017 . Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (In thousands) As Previously Reported Adoption of ASU 2014-09 As Adjusted As Previously Reported Adoption of ASU 2014-09 As Adjusted Non-interest income: Bank card transaction fees $ 44,999 $ (7,704 ) $ 37,295 $ 88,203 $ (15,157 ) $ 73,046 Total non-interest income 123,084 (7,704 ) 115,380 240,150 (15,157 ) 224,993 Non-interest expense: Data processing and software $ 23,356 $ (3,321 ) $ 20,035 $ 46,453 $ (6,513 ) $ 39,940 Other 19,761 (4,383 ) 15,378 39,725 (8,644 ) 31,081 Total non-interest expense 184,594 (7,704 ) 176,890 371,424 (15,157 ) 356,267
Disaggregation of Revenue [Table Text Block]	The following table disaggregates non-interest income subject to ASU 2014-09 by major product line. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Bank card transaction fees $ 43,215 $ 37,295 $ 84,668 $ 73,046 Trust fees 37,036 33,120 73,098 65,134 Deposit account charges and other fees 23,893 22,861 46,875 44,803 Consumer brokerage services 3,971 3,726 7,739 7,375 Other non-interest income 6,852 8,570 14,163 16,167 Total non-interest income from contracts with customers 114,967 105,572 226,543 206,525 Other non-interest income (a) 9,883 9,808 17,997 18,468 Total non-interest income $ 124,850 $ 115,380 $ 244,540 $ 224,993 (a) This revenue is not within the scope of ASU 2014-09, and includes fees relating to capital market activities, loan fees and sales, derivative instruments, standby letters of credit and various other transactions.
Contract with Customer, Asset and Liability [Table Text Block]	The following table presents the opening and closing receivable balances for the six month periods ended June 30, 2018 and 2017 for the Company’s significant revenue categories subject to ASU 2014-09. (In thousands) June 30, 2018 December 31, 2017 June 30, 2017 December 31, 2016 Bank card transaction fees $ 11,104 $ 13,315 $ 10,878 $ 14,686 Trust fees 2,893 2,802 3,227 2,681 Deposit account charges and other fees 5,773 5,597 5,471 5,735 Consumer brokerage services 924 380 345 309
Bank Card Transaction Fees [Table Text Block]	The following table presents the components of bank card fee income. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Debit card: Fee income $ 10,582 $ 10,325 $ 20,344 $ 19,966 Expense for network charges (375 ) (1,921 ) (746 ) (3,571 ) Net debit card fees 10,207 8,404 19,598 16,395 Credit card: Fee income 6,800 6,483 12,845 12,223 Expense for network charges and rewards (3,304 ) (2,923 ) (6,248 ) (5,669 ) Net credit card fees 3,496 3,560 6,597 6,554 Corporate card: Fee income 49,141 43,261 97,017 85,680 Expense for network charges and rewards (24,521 ) (23,365 ) (48,229 ) (45,820 ) Net corporate card fees 24,620 19,896 48,788 39,860 Merchant: Fee income 7,606 8,350 14,907 16,289 Fees to cardholder banks (1,878 ) (2,080 ) (3,603 ) (4,169 ) Expense for network charges (836 ) (835 ) (1,619 ) (1,883 ) Net merchant fees 4,892 5,435 9,685 10,237 Total bank card transaction fees $ 43,215 $ 37,295 $ 84,668 $ 73,046 The majority of debit and credit card fees are reported in the Consumer segment, while corporate card and merchant fees are reported in the Commercial segment.
Trust Fees [Table Text Block]	The following table shows the components of revenue within trust fees. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Private client $ 27,987 $ 24,701 $ 54,855 $ 48,463 Institutional 7,271 6,751 14,682 13,245 Other 1,778 1,668 3,561 3,426 Total trust fees $ 37,036 $ 33,120 $ 73,098 $ 65,134 This revenue is reported in the Wealth segment.
Deposit Account Charges and Other Fees [Table Text Block]	The following table shows the components of revenue within deposit account charges and other fees. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Corporate cash management fees $ 10,095 $ 9,477 $ 19,492 $ 18,388 Overdraft and return item fees 7,656 7,448 15,168 14,628 Other service charges on deposit accounts 6,142 5,936 12,215 11,787 Total deposit account charges and other fees $ 23,893 $ 22,861 $ 46,875 $ 44,803 Approximately half of this revenue is reported in the Consumer segment, while the remainder is reported in the Commercial segment.
Consumer Brokerage Services Revenue [Table Text Block]	The following shows the components of revenue within consumer brokerage services. Three Months Ended June 30 Six Months Ended June 30 (In thousands) 2018 2017 2018 2017 Commission income $ 2,269 $ 2,193 $ 4,361 $ 4,423 Managed account services 1,702 1,533 3,378 2,952 Total consumer brokerage services $ 3,971 $ 3,726 $ 7,739 $ 7,375 Nearly all of this revenue is reported in the Company's Wealth segment.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Measurements [Abstract]
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The table below presents the June 30, 2018 and December 31, 2017 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first six months of 2018 or the year ended December 31, 2017 . Fair Value Measurements Using (In thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2018 Assets: Residential mortgage loans held for sale $ 10,750 $ — $ 10,750 $ — Available for sale debt securities: U.S. government and federal agency obligations 911,092 911,092 — — Government-sponsored enterprise obligations 311,361 — 311,361 — State and municipal obligations 1,379,164 — 1,364,091 15,073 Agency mortgage-backed securities 3,131,025 — 3,131,025 — Non-agency mortgage-backed securities 1,010,331 — 1,010,331 — Asset-backed securities 1,338,542 — 1,338,542 — Other debt securities 330,861 — 330,861 — Trading debt securities 31,156 — 31,156 — Equity securities 2,741 2,741 — — Private equity investments 68,940 — — 68,940 Derivatives * 6,239 — 5,488 751 Assets held in trust for deferred compensation plan 13,790 13,790 — — Total assets 8,545,992 927,623 7,533,605 84,764 Liabilities: Derivatives * 19,846 — 19,779 67 Liabilities held in trust for deferred compensation plan 13,790 13,790 — — Total liabilities $ 33,636 $ 13,790 $ 19,779 $ 67 December 31, 2017 Assets: Residential mortgage loans held for sale $ 15,327 $ — $ 15,327 $ — Available for sale debt securities: U.S. government and federal agency obligations 917,147 917,147 — — Government-sponsored enterprise obligations 406,363 — 406,363 — State and municipal obligations 1,611,366 — 1,594,350 17,016 Agency mortgage-backed securities 3,040,913 — 3,040,913 — Non-agency mortgage-backed securities 905,793 — 905,793 — Asset-backed securities 1,492,800 — 1,492,800 — Other debt securities 351,060 — 351,060 — Trading debt securities 18,269 — 18,269 — Equity securities 48,838 19,864 28,974 — Private equity investments 55,752 — — 55,752 Derivatives * 8,349 — 7,723 626 Assets held in trust for deferred compensation plan 12,843 12,843 — — Total assets 8,884,820 949,854 7,861,572 73,394 Liabilities: Derivatives * 8,074 — 7,951 123 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — Total liabilities $ 20,917 $ 12,843 $ 7,951 $ 123
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (In thousands) State and Municipal Obligations Private Equity Investments Derivatives Total For the three months ended June 30, 2018 Balance March 31, 2018 $ 17,158 $ 64,951 $ 520 $ 82,629 Total gains or losses (realized/unrealized): Included in earnings — 3,791 164 3,955 Included in other comprehensive income * (379 ) — — (379 ) Investment securities sold (1,715 ) — — (1,715 ) Discount accretion 9 — — 9 Purchases of private equity investments — 364 — 364 Sale/pay down of private equity investments — (166 ) — (166 ) Balance June 30, 2018 $ 15,073 $ 68,940 $ 684 $ 84,697 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 June 30, 2018 $ — $ 3,791 $ 747 $ 4,538 For the six months ended June 30, 2018 Balance January 1, 2018 $ 17,016 $ 55,752 $ 503 $ 73,271 Total gains or losses (realized/unrealized): Included in earnings — 8,096 329 8,425 Included in other comprehensive income * (246 ) — — (246 ) Investment securities sold (1,715 ) — — (1,715 ) Discount accretion 18 — — 18 Purchases of private equity investments — 5,243 — 5,243 Sale/pay down of private equity investments — (186 ) — (186 ) Capitalized interest/dividends — 35 — 35 Sale of risk participation agreement — — (148 ) (148 ) Balance June 30, 2018 $ 15,073 $ 68,940 $ 684 $ 84,697 Total gains or losses for the six months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2018 $ — $ 8,096 $ 910 $ 9,006 For the three months ended June 30, 2017 Balance March 31, 2017 $ 17,083 $ 52,800 $ 822 $ 70,705 Total gains or losses (realized/unrealized): Included in earnings — 48 (31 ) 17 Included in other comprehensive income * 319 — — 319 Investment securities called (600 ) — — (600 ) Discount accretion 23 — — 23 Purchases of private equity investments — 2,259 — 2,259 Sale/pay down of private equity investments — (1,550 ) — (1,550 ) Balance June 30, 2017 $ 16,825 $ 53,557 $ 791 $ 71,173 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 June 30, 2017 $ — $ 48 $ 872 $ 920 For the six months ended June 30, 2017 Balance January 1, 2017 $ 16,682 $ 50,820 $ 258 $ 67,760 Total gains or losses (realized/unrealized): Included in earnings — (2,830 ) 533 (2,297 ) Included in other comprehensive income * 710 — — 710 Investment securities called (600 ) — — (600 ) Discount accretion 33 — — 33 Purchases of private equity investments — 7,084 — 7,084 Sale/pay down of private equity investments — (1,550 ) — (1,550 ) Capitalized interest/dividends — 33 — 33 Balance June 30, 2017 $ 16,825 $ 53,557 $ 791 $ 71,173 Total gains or losses for the six months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2017 $ — $ (2,655 ) $ 882 $ (1,773 )
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 June 30, 2018 Total gains or losses included in earnings $ 147 $ 17 $ 3,791 $ 3,955 Change in unrealized gains or losses relating to assets still held at June 30, 2018 $ 730 $ 17 $ 3,791 $ 4,538 For the six months ended June 30, 2018 Total gains or losses included in earnings $ 149 $ 180 $ 8,096 $ 8,425 Change in unrealized gains or losses relating to assets still held at June 30, 2018 $ 730 $ 180 $ 8,096 $ 9,006 For the three months ended June 30, 2017 Total gains or losses included in earnings $ (32 ) $ 1 $ 48 $ 17 Change in unrealized gains or losses relating to assets still held at June 30, 2017 $ 871 $ 1 $ 48 $ 920 For the six months ended June 30, 2017 Total gains or losses included in earnings $ 522 $ 11 $ (2,830 ) $ (2,297 ) Change in unrealized gains or losses relating to assets still held at June 30, 2017 $ 871 $ 11 $ (2,655 ) $ (1,773 )
Summary Of Quantitative Information About Level 3 Fair Value Measurements	s The Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiaries, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $15.1 million at June 30, 2018 , while private equity investments, included in other securities, totaled $68.9 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 5 years Estimated market rate 3.7% - 5.9% Private equity investments Market comparable companies EBITDA multiple 4.0 - 6.0 Mortgage loan commitments Discounted cash flow Probability of funding 50.5% - 98.8% 80.4% Embedded servicing value .5% - 2.4% 1.3%
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]	s For assets measured at fair value on a nonrecurring basis during the first six months of 2018 and 2017 , and still held as of June 30, 2018 and 2017 , the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at June 30, 2018 and 2017 . Fair Value Measurements Using (In thousands) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Gains (Losses) Recognized During the Six Months Ended June 30 June 30, 2018 Collateral dependent impaired loans $ 175 $ — $ — $ 175 $ (118 ) Mortgage servicing rights 5,463 — — 5,463 9 Foreclosed assets 47 — — 47 (47 ) Long-lived assets 914 — — 914 (552 ) June 30, 2017 Collateral dependent impaired loans $ 2,044 $ — $ — $ 2,044 $ (550 ) Mortgage servicing rights 3,646 — — 3,646 6 Foreclosed assets 75 — — 75 (58 ) Long-lived assets 1,834 — — 1,834 (343 )

Fair Value Of Financial Instr38

Fair Value Of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Of Financial Instruments [Abstract]
Fair value of financial instruments [Table Text Block]	Carrying Amount Estimated Fair Value at June 30, 2018 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,990,298 $ — $ — $ 4,890,517 $ 4,890,517 Real estate - construction and land 967,151 — — 962,276 962,276 Real estate - business 2,727,580 — — 2,689,312 2,689,312 Real estate - personal 2,102,586 — — 2,038,381 2,038,381 Consumer 2,012,644 — — 1,976,911 1,976,911 Revolving home equity 374,557 — — 367,886 367,886 Consumer credit card 775,214 — — 720,044 720,044 Overdrafts 4,081 — — 3,018 3,018 Total loans 13,954,111 — — 13,648,345 13,648,345 Loans held for sale 20,352 — 20,352 — 20,352 Investment securities 8,560,285 913,833 7,517,367 129,085 8,560,285 Federal funds sold 31,500 31,500 — — 31,500 Securities purchased under agreements to resell 700,000 — — 680,830 680,830 Interest earning deposits with banks 114,947 114,947 — — 114,947 Cash and due from banks 386,339 386,339 — — 386,339 Derivative instruments 6,239 — 5,488 751 6,239 Assets held in trust for deferred compensation plan 13,790 13,790 — — 13,790 Total $ 23,787,563 $ 1,460,409 $ 7,543,207 $ 14,459,011 $ 23,462,627 Financial Liabilities Non-interest bearing deposits $ 6,876,756 $ 6,876,756 $ — $ — $ 6,876,756 Savings, interest checking and money market deposits 11,761,832 11,761,832 — — 11,761,832 Time open and certificates of deposit 1,682,969 — — 1,682,894 1,682,894 Federal funds purchased 131,685 131,685 — — 131,685 Securities sold under agreements to repurchase 1,035,074 — — 1,035,558 1,035,558 Other borrowings 9,291 — 7,682 1,609 9,291 Derivative instruments 19,846 — 19,779 67 19,846 Liabilities held in trust for deferred compensation plan 13,790 13,790 — — 13,790 Total $ 21,531,243 $ 18,784,063 $ 27,461 $ 2,720,128 $ 21,531,652 Carrying Amount Estimated Fair Value at December 31, 2017 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets Loans: Business $ 4,958,554 $ — $ — $ 4,971,401 $ 4,971,401 Real estate - construction and land 968,820 — — 979,389 979,389 Real estate - business 2,697,452 — — 2,702,598 2,702,598 Real estate - personal 2,062,787 — — 2,060,443 2,060,443 Consumer 2,104,487 — — 2,074,129 2,074,129 Revolving home equity 400,587 — — 400,333 400,333 Consumer credit card 783,864 — — 798,093 798,093 Overdrafts 7,123 — — 7,123 7,123 Total loans 13,983,674 — — 13,993,509 13,993,509 Loans held for sale 21,398 — 21,398 — 21,398 Investment securities 8,893,307 937,011 7,838,522 117,774 8,893,307 Federal funds sold 42,775 42,775 — — 42,775 Securities purchased under agreements to resell 700,000 — — 695,194 695,194 Interest earning deposits with banks 30,631 30,631 — — 30,631 Cash and due from banks 438,439 438,439 — — 438,439 Derivative instruments 8,349 — 7,723 626 8,349 Assets held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 24,131,416 $ 1,461,699 $ 7,867,643 $ 14,807,103 $ 24,136,445 Financial Liabilities Non-interest bearing deposits $ 7,158,962 $ 7,158,962 $ — $ — $ 7,158,962 Savings, interest checking and money market deposits 11,499,620 11,499,620 — — 11,499,620 Time open and certificates of deposit 1,766,864 — — 1,768,780 1,768,780 Federal funds purchased 202,370 202,370 — — 202,370 Securities sold under agreements to repurchase 1,304,768 — — 1,305,375 1,305,375 Other borrowings 1,758 — — 1,758 1,758 Derivative instruments 8,074 — 7,951 123 8,074 Liabilities held in trust for deferred compensation plan 12,843 12,843 — — 12,843 Total $ 21,955,259 $ 18,873,795 $ 7,951 $ 3,076,036 $ 21,957,782

Loans And Allowance For Loan 39

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Abstract]
Loans pledged at the Federal Home Loan Bank as collateral for borrowings and letters of credit obtained to secure public deposits	$ 3,700,000,000
Loans Pledged to the Federal Reserve Bank as collateral for discount window borrowings	$ 1,700,000,000
Period after which loans are deemed in default (in days)	90 days
Effect on Interest Income Resulting From Modification to Credit Card Loans	$ (925,000)
Commitments to lend additional funds to customers with restructured loans	6,100,000
Fair Value of Personal Real Estate Loans Held for Sale	10,800,000
Unpaid Principal Balance on Personal Real Estate Loans Held for Sale	10,400,000
Student Loans Held for Sale, Lower of Cost or Fair Value	9,600,000
HFS Loans on non accrual status	0
HFS loans past due and still accruing	0
Foreclosed real estate	1,000,000	$ 681,000
Personal property acquired in repossession	$ 2,300,000	$ 2,700,000

Loans And Allowance For Loan 40

Loans And Allowance For Loan Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 13,954,111	$ 13,983,674
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	4,990,298	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	967,151	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,727,580	2,697,452
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,102,586	2,062,787
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	2,012,644	2,104,487
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	374,557	400,587
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	775,214	783,864
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total loans	$ 4,081	$ 7,123

Loans And Allowance For Loan 41

Loans And Allowance For Loan Losses (Summary Of Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 159,532	$ 157,832	$ 159,532	$ 155,932
Provision	10,043	10,758	20,439	21,886
Loans charged off	13,685	13,946	27,416	26,822
Less recoveries on loans	3,642	3,188	6,977	6,836
Net loan charge-offs (recoveries)	10,043	10,758	20,439	19,986
Balance at end of period	159,532	157,832	159,532	157,832
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	93,065	92,951	93,704	91,361
Provision	485	(111)	(409)	1,002
Loans charged off	362	531	728	1,077
Less recoveries on loans	663	430	1,284	1,453
Net loan charge-offs (recoveries)	(301)	101	(556)	(376)
Balance at end of period	93,851	92,739	93,851	92,739
Personal Banking Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	66,467	64,881	65,828	64,571
Provision	9,558	10,869	20,848	20,884
Loans charged off	13,323	13,415	26,688	25,745
Less recoveries on loans	2,979	2,758	5,693	5,383
Net loan charge-offs (recoveries)	10,344	10,657	20,995	20,362
Balance at end of period	$ 65,681	$ 65,093	$ 65,681	$ 65,093

Loans And Allowance For Loan 42

Loans And Allowance For Loan Losses (Allowance For Loan Losses And Related Loan Balance Disaggregated On The Basis Of Impairment Methodology) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	$ 13,845,215	$ 13,868,879
Impaired Financing Receivable, Recorded Investment	108,896	114,795
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	155,982	155,289
Impaired Financing Receivable, Related Allowance	3,550	4,243
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	8,594,305	8,532,213
Impaired Financing Receivable, Recorded Investment	90,724	92,613
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	91,220	90,637
Impaired Financing Receivable, Related Allowance	2,631	3,067
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment	5,250,910	5,336,666
Impaired Financing Receivable, Recorded Investment	18,172	22,182
Loans and Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance	64,762	64,652
Impaired Financing Receivable, Related Allowance	$ 919	$ 1,176

Loans And Allowance For Loan 43

Loans And Allowance For Loan Losses (Investment In Impaired Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Abstract]
Non-accrual loans	$ 9,472	$ 11,983
Restructured loans (accruing)	99,424	102,812
Total impaired loans	$ 108,896	$ 114,795

Loans And Allowance For Loan 44

Loans And Allowance For Loan Losses (Additional Information About Impaired Loans Held) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 6,156,000	$ 7,434,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,236,000	11,120,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	102,740,000	107,361,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	106,030,000	111,309,000
Impaired Financing Receivable, Related Allowance	3,550,000	4,243,000
Impaired Financing Receivable, Recorded Investment	108,896,000	114,795,000
Impaired Financing Receivable, Unpaid Principal Balance	116,266,000	122,429,000
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,946,000	5,356,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,936,000	9,000,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	70,871,000	72,589,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	71,157,000	73,168,000
Impaired Financing Receivable, Related Allowance	2,090,000	2,455,000
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,342,000	837,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,346,000	841,000
Impaired Financing Receivable, Related Allowance	39,000	27,000
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,210,000	1,299,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,300,000	1,303,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,355,000	12,532,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,928,000	13,071,000
Impaired Financing Receivable, Related Allowance	502,000	585,000
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,707,000	9,126,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,134,000	11,914,000
Impaired Financing Receivable, Related Allowance	295,000	532,000
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	779,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	817,000
Impaired Financing Receivable, with No Related Allowance, Allowance	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,464,000	5,388,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,464,000	5,426,000
Impaired Financing Receivable, Related Allowance	52,000	67,000
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	114,000	204,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	114,000	204,000
Impaired Financing Receivable, Related Allowance	11,000	11,000
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,887,000	6,685,000
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,887,000	6,685,000
Impaired Financing Receivable, Related Allowance	$ 561,000	$ 566,000

Loans And Allowance For Loan 45

Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 9,681	$ 14,406	$ 10,561	$ 14,265
Restructured loans (accruing)	98,954	50,545	98,495	49,324
Total	108,635	64,951	109,056	63,589
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	7,676	9,867	8,097	10,238
Restructured loans (accruing)	81,832	34,765	80,552	33,333
Total	89,508	44,632	88,649	43,571
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	2,005	4,539	2,464	4,027
Restructured loans (accruing)	17,122	15,780	17,943	15,991
Total	$ 19,127	$ 20,319	$ 20,407	$ 20,018

Loans And Allowance For Loan 46

Loans And Allowance For Loan Losses (Interest Income Recognized on Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 1,284	$ 675	$ 2,565	$ 1,345
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	821	319	1,641	637
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	22	1	44	2
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	147	88	294	175
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	52	36	103	71
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	82	80	164	159
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	1	6	2	12
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Interest income recognized	$ 159	$ 145	$ 317	$ 289

Loans And Allowance For Loan 47

Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	$ 13,878,250	$ 13,897,272
30 - 89 Days Past Due	52,936	56,292
90 Days Past Due and Still Accruing	13,453	18,127
Non-accrual loans	9,472	11,983
Total	13,954,111	13,983,674
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	4,990,298	4,958,554
Business [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	4,983,337	4,949,148
30 - 89 Days Past Due	1,404	3,085
90 Days Past Due and Still Accruing	443	374
Non-accrual loans	5,114	5,947
Total	4,990,298	4,958,554
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	967,151	968,820
Real Estate - Construction And Land [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	963,654	967,321
30 - 89 Days Past Due	3,492	1,473
90 Days Past Due and Still Accruing	0	21
Non-accrual loans	5	5
Total	967,151	968,820
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,727,580	2,697,452
Real Estate - Business [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,718,888	2,694,234
30 - 89 Days Past Due	6,227	482
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	2,465	2,736
Total	2,727,580	2,697,452
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,102,586	2,062,787
Real Estate - Personal [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	2,092,350	2,050,787
30 - 89 Days Past Due	7,155	6,218
90 Days Past Due and Still Accruing	1,193	3,321
Non-accrual loans	1,888	2,461
Total	2,102,586	2,062,787
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,012,644	2,104,487
Consumer [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	1,985,195	2,067,025
30 - 89 Days Past Due	25,096	32,674
90 Days Past Due and Still Accruing	2,353	3,954
Non-accrual loans	0	834
Total	2,012,644	2,104,487
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	374,557	400,587
Revolving Home Equity [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	372,865	397,349
30 - 89 Days Past Due	708	1,962
90 Days Past Due and Still Accruing	984	1,276
Non-accrual loans	0	0
Total	374,557	400,587
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	775,214	783,864
Consumer Credit Card [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	758,230	764,568
30 - 89 Days Past Due	8,504	10,115
90 Days Past Due and Still Accruing	8,480	9,181
Non-accrual loans	0	0
Total	775,214	783,864
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	4,081	7,123
Overdrafts [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 Days Past Due	3,731	6,840
30 - 89 Days Past Due	350	283
90 Days Past Due and Still Accruing	0	0
Non-accrual loans	0	0
Total	$ 4,081	$ 7,123

Loans And Allowance For Loan 48

Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) - Commercial Portfolio Segment [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 8,685,029	$ 8,624,826
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	8,374,249	8,288,517
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	103,063	120,368
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	200,133	207,253
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	7,584	8,688
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,990,298	4,958,554
Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	4,771,613	4,740,013
Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	58,771	59,177
Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	154,800	153,417
Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5,114	5,947
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	967,151	968,820
Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	954,492	955,499
Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	10,501	10,614
Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,153	2,702
Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	5	5
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,727,580	2,697,452
Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	2,648,144	2,593,005
Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	33,791	50,577
Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	43,180	51,134
Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial Loan Portfolio Gross Carrying Amount	$ 2,465	$ 2,736

Loans And Allowance For Loan 49

Loans And Allowance For Loan Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding ) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 211.1	$ 219.2
Consumer Healthcare Loans Excluded	$ 161.8	$ 145
Credit quality personal banking loan table percentage loans excluded	8.00%
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real Estate - Personal [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.10%	1.30%
Real Estate - Personal [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.00%	2.10%
Real Estate - Personal [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.00%	10.50%
Real Estate - Personal [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.60%	25.60%
Real Estate - Personal [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	63.30%	60.50%
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	3.20%	3.30%
Consumer [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	5.10%	5.50%
Consumer [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	18.00%	17.30%
Consumer [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.60%	26.80%
Consumer [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	50.10%	47.10%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	0.80%	1.10%
Revolving Home Equity [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	1.60%	1.70%
Revolving Home Equity [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	9.20%	9.50%
Revolving Home Equity [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	22.10%	21.40%
Revolving Home Equity [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	66.30%	66.30%
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer Credit Card [Member] | Fico Under Six Hundred [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.60%	4.70%
Consumer Credit Card [Member] | Fico Six Hundred To Six Hundred Fifty Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	14.10%	14.40%
Consumer Credit Card [Member] | Fico Six Hundred Sixty To Seven Hundred Nineteen [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	35.30%	34.40%
Consumer Credit Card [Member] | Fico Seven Hundred Twenty To Seven Hundred Seventy Nine [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.40%	26.00%
Consumer Credit Card [Member] | Fico Seven Hundred Eighty And Above [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	19.60%	20.50%

Loans And Allowance For Loan 50

Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 106,580	$ 110,608
Balance 90 days past due at any time during previous 12 months	1,069
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	75,680
Balance 90 days past due at any time during previous 12 months	32
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,337
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,311
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]
Financing Receivable, Modifications, Recorded Investment	4,787
Balance 90 days past due at any time during previous 12 months	303
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,464
Balance 90 days past due at any time during previous 12 months	115
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	114
Balance 90 days past due at any time during previous 12 months	42
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,887
Balance 90 days past due at any time during previous 12 months	$ 577

Loans And Allowance For Loan 51

Loans And Allowance For Loan Losses Troubled Debt Restructurings by Type of Modification (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 106,580	$ 110,608
TDR Non-market interest rates [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	86,906	88,588
TDR Assistance programs [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,887	6,685
TDR-Bankruptcy non-affirmation [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,335	7,283
TDR Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	296	256
TDR Non-accrual loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 7,156	$ 7,796

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Investment [Line Items]
Equity Securities, FV-NI, Cost	$ 2,500
Equity securities with a readily determinable fair value	2,741		$ 48,838
Equity securities redeemed for cash due to a third-party merger	(39,900)
Equity securities, FV-NI, Unrealized Gain (Loss)	(176)
Equtiy Securities without Readily Determinable Fair Values	1,703		1,753
U.S. Treasury inflation-protected securities held, at fair value	$ 443,800
Percentage decrease requiring a review for impairment	20.00%
Fair value of securities on other-than-temporary impairment watch list	$ 57,300		68,000
Credit-related portion of impairments included in earnings, for securities on watch list	14,163	$ 14,254	14,199	$ 14,080
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,492,146		5,172,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	137,574		44,122
AFS securities in loss position at period-end, change in unrealized loss	93,500
Securities pledged as collateral	3,800,000
Securities pledged as collateral and may be sold or re-pledged	$ 557,700
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	$ 15,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	510,743		332,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,711		2,754
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Fair value of securities on other-than-temporary impairment watch list	22,400
Credit-related portion of impairments included in earnings, for securities on watch list	14,163
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	908,569		730,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	15,446		$ 4,837
Private Equity Funds [Member]
Investment [Line Items]
Net gains on private equity investments	8,100
Equity Securities [Member]
Investment [Line Items]
Equity securities, FV-NI, Unrealized Gain	2,699	0
Adjustment to recognize dividend income on a liquidiated security	8,917	$ 0
Accounting Standards Update 2016-01 [Member]
Investment [Line Items]
Unrealized gain previously recorded in AOCI reclassified to Retained Earnings at adoption of ASU 2016-01	$ 33,320

Investment Securities (Investme

Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Securities [Abstract]
Available-for-sale Securities, Debt Securities	$ 8,412,376	$ 8,725,442
Trading securities	31,156	18,269
Equity securities with a readily determinable fair value	2,741	48,838
Equtiy Securities without Readily Determinable Fair Values	1,703	1,753
Federal Reserve Bank Stock	33,369	33,253
Federal Home Loan Bank Stock	10,000	10,000
Private equity investments	68,940	55,752
Total investment securities	$ 8,560,285	$ 8,893,307

Investment Securities (Summary

Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Amortized Cost	$ 8,526,772	$ 8,715,456
Fair Value	8,412,376	8,725,442
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	925,260	917,494
Fair Value	911,092	917,147
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	52,660
Fair Value	52,603
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	645,431
Fair Value	634,819
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	157,967
Fair Value	155,108
U.S. Government And Federal Agency Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	69,202
Fair Value	68,562
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Amortized Cost	316,982	408,266
Fair Value	311,361	406,363
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	117,562
Fair Value	117,444
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	121,584
Fair Value	119,743
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	34,984
Fair Value	33,946
Government-Sponsored Enterprise Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	42,852
Fair Value	40,228
State And Municipal Obligations [Member]
Investment [Line Items]
Amortized Cost	1,378,770	1,592,707
Fair Value	1,379,164	1,611,366
State And Municipal Obligations [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	147,325
Fair Value	147,668
State And Municipal Obligations [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	598,663
Fair Value	600,688
State And Municipal Obligations [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	591,819
Fair Value	590,950
State And Municipal Obligations [Member] | Available For Sale Maturity After10 Years [Member]
Investment [Line Items]
Amortized Cost	40,963
Fair Value	39,858
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	3,194,764	3,046,701
Fair Value	3,131,025	3,040,913
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,019,545	903,920
Fair Value	1,010,331	905,793
Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,351,461	1,495,380
Fair Value	1,338,542	1,492,800
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	5,565,770	5,446,001
Fair Value	5,479,898	5,439,506
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	339,990	350,988
Fair Value	330,861	$ 351,060
Other Debt Securities [Member] | Available For Sale Securities Maturity Within1 Year [Member]
Investment [Line Items]
Amortized Cost	9,003
Fair Value	8,971
Other Debt Securities [Member] | Available For Sale Securities Maturity After1 But Within5 Years [Member]
Investment [Line Items]
Amortized Cost	257,704
Fair Value	252,151
Other Debt Securities [Member] | Available For Sale Securities Maturity After5 But Within10 Years [Member]
Investment [Line Items]
Amortized Cost	73,283
Fair Value	$ 69,739

Investment Securities (Availabl

Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Amortized Cost	$ 8,526,772	$ 8,715,456
Available For Sale Securities, Gross Unreailzed Gain at Period End	23,178	54,108
Available For Sale Securities, Gross Unrealized Loss at Period End	(137,574)	(44,122)
Fair Value	8,412,376	8,725,442
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Amortized Cost	925,260	917,494
Available For Sale Securities, Gross Unreailzed Gain at Period End	503	4,096
Available For Sale Securities, Gross Unrealized Loss at Period End	(14,671)	(4,443)
Fair Value	911,092	917,147
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Amortized Cost	316,982	408,266
Available For Sale Securities, Gross Unreailzed Gain at Period End	0	26
Available For Sale Securities, Gross Unrealized Loss at Period End	(5,621)	(1,929)
Fair Value	311,361	406,363
State And Municipal Obligations [Member]
Investment [Line Items]
Amortized Cost	1,378,770	1,592,707
Available For Sale Securities, Gross Unreailzed Gain at Period End	8,105	21,413
Available For Sale Securities, Gross Unrealized Loss at Period End	(7,711)	(2,754)
Fair Value	1,379,164	1,611,366
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	3,194,764	3,046,701
Available For Sale Securities, Gross Unreailzed Gain at Period End	5,995	17,956
Available For Sale Securities, Gross Unrealized Loss at Period End	(69,734)	(23,744)
Fair Value	3,131,025	3,040,913
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,019,545	903,920
Available For Sale Securities, Gross Unreailzed Gain at Period End	6,232	6,710
Available For Sale Securities, Gross Unrealized Loss at Period End	(15,446)	(4,837)
Fair Value	1,010,331	905,793
Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	1,351,461	1,495,380
Available For Sale Securities, Gross Unreailzed Gain at Period End	2,343	2,657
Available For Sale Securities, Gross Unrealized Loss at Period End	(15,262)	(5,237)
Fair Value	1,338,542	1,492,800
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Amortized Cost	5,565,770	5,446,001
Available For Sale Securities, Gross Unreailzed Gain at Period End	14,570	27,323
Available For Sale Securities, Gross Unrealized Loss at Period End	(100,442)	(33,818)
Fair Value	5,479,898	5,439,506
Other Debt Securities [Member]
Investment [Line Items]
Amortized Cost	339,990	350,988
Available For Sale Securities, Gross Unreailzed Gain at Period End	0	1,250
Available For Sale Securities, Gross Unrealized Loss at Period End	(9,129)	(1,178)
Fair Value	$ 330,861	$ 351,060

Investment Securities (Cash Flo

Investment Securities (Cash Flow Model Inputs Used To Calculate Credit Losses) (Details)	Jun. 30, 2018
Minimum [Member]
Investment [Line Items]
Prepayment CPR	0.00%
Projected cumulative default	13.00%
Credit support	0.00%
Loss severity	14.00%
Maximum [Member]
Investment [Line Items]
Prepayment CPR	25.00%
Projected cumulative default	52.00%
Credit support	20.00%
Loss severity	63.00%

Investment Securities (Changes

Investment Securities (Changes In Recorded Credit Losses) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 14,163	$ 14,254	$ 14,199	$ 14,080
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	58	46
Credit losses on debt securities for which impairment was previously recognized	10	274
Increase in expected cash flows that are recognized over remaining life of security	$ (104)	$ (146)

Investment Securities (Securiti

Investment Securities (Securities With Unrealized Losses And Length Of Impairment Period) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Less than 12 months, Fair Value	$ 5,405,253	$ 4,015,697
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	102,133	24,201
12 months or longer, Fair Value	1,086,893	1,156,715
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	35,441	19,921
Total, Fair Value	6,492,146	5,172,412
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	137,574	44,122
AFS securities in loss position at period-end, change in unrealized loss	93,500
U.S. Government And Federal Agency Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	707,018	618,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12,156	4,443
12 months or longer, Fair Value	90,340	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,515	0
Total, Fair Value	797,358	618,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	14,671	4,443
Government-Sponsored Enterprise Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	261,378	286,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,605	1,712
12 months or longer, Fair Value	49,983	49,766
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	16	217
Total, Fair Value	311,361	336,159
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	5,621	1,929
State And Municipal Obligations [Member]
Investment [Line Items]
Less than 12 months, Fair Value	458,880	282,843
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,700	1,752
12 months or longer, Fair Value	51,863	49,339
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,011	1,002
Total, Fair Value	510,743	332,182
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	7,711	2,754
Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	2,029,957	1,320,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	45,267	9,433
12 months or longer, Fair Value	566,986	619,300
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	24,467	14,311
Total, Fair Value	2,596,943	1,939,989
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	69,734	23,744
Non-Agency Mortgage-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	773,890	577,017
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12,076	2,966
12 months or longer, Fair Value	134,679	153,813
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,370	1,871
Total, Fair Value	908,569	730,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	15,446	4,837
Asset-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	862,416	786,048
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	13,296	3,168
12 months or longer, Fair Value	173,895	264,295
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,966	2,069
Total, Fair Value	1,036,311	1,050,343
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	15,262	5,237
Total Mortgage And Asset-Backed Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	3,666,263	2,683,754
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	70,639	15,567
12 months or longer, Fair Value	875,560	1,037,408
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	29,803	18,251
Total, Fair Value	4,541,823	3,721,162
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	100,442	33,818
Debt Securities [Member]
Investment [Line Items]
Less than 12 months, Fair Value	311,714	144,090
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8,033	727
12 months or longer, Fair Value	19,147	20,202
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,096	451
Total, Fair Value	330,861	164,292
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 9,129	$ 1,178

Investment Securities (Proceeds

Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Investment [Line Items]
Proceeds from Sale and Maturity of Available-for-sale Securities				$ 152,541		$ 4,972
Proceeds from Sale of Equity Securities				39,981		584
Proceeds from sales of other securities				0		996
Total proceeds	[1]			192,522		6,552
Investment securities gains (losses), net		$ (3,075)	$ 1,651	2,335	[1]	879	[1]
Available-for-sale Securities [Member]
Investment [Line Items]
Loss Realized on Called Bond				0		254
Available-for-sale Securities, Gross Realized Gains				423		0
Available-for-sale Securities, Gross Realized Losses				0		(22)
Other-than-temporary impairment recognized on debt securities				(68)		(320)
Equity Securities [Member]
Investment [Line Items]
Gain realized on donation				0		4,315
Gain realized on sales				102		584
Loss realized on sales				(8,917)		0
Fair value adjustments, net				2,699		0
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales				0		58
Other securities loss on sale				0		(652)
Fair value adjustments, net				$ 8,096		$ (2,830)
[1]	Available for sale and non-marketable securities

Goodwill And Other Intangible60

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 313	$ 330	$ 634	$ 678

Goodwill And Other Intangible61

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Estimable Useful Lives) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 40,266	$ 39,176
Accumulated Amortization	(32,183)	(31,549)
Valuation Allowance	0	(9)
Net Amount	8,083	7,618
Core Deposit Premium [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,270	31,270
Accumulated Amortization	(28,650)	(28,305)
Valuation Allowance	0	0
Net Amount	2,620	2,965
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,996	7,906
Accumulated Amortization	(3,533)	(3,244)
Valuation Allowance	0	(9)
Net Amount	$ 5,463	$ 4,653

Goodwill And Other Intangible62

Goodwill And Other Intangible Assets (Schedule Of Estimated Annual Amortization Expense) (Details) $ in Thousands	Jun. 30, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 1,232
2,019	1,094
2,020	937
2,021	816
2,022	$ 720

Goodwill And Other Intangible63

Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Goodwill and Intangible Assets [Roll Forward]
Amortization	$ 313	$ 330	$ 634	$ 678
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			(345)
Impairment reversal			0
Intangible Assets, Net (Including Goodwill)	2,620		2,620		2,965
Mortgage Servicing Rights [Member]
Goodwill and Intangible Assets [Roll Forward]
Originations			1,090
Amortization			(289)
Impairment reversal			9
Intangible Assets, Net (Including Goodwill)	$ 5,463		$ 5,463		$ 4,653

Goodwill And Other Intangible64

Goodwill And Other Intangible Assets (Schedule Of Goodwill Allocated By Operating Segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 138,921	$ 138,921
Consumer Segment [Member]
Goodwill [Line Items]
Goodwill	70,721	70,721
Commercial Segment [Member]
Goodwill [Line Items]
Goodwill	67,454	67,454
Wealth Segment [Member]
Goodwill [Line Items]
Goodwill	$ 746	$ 746

Guarantees (Details)

Guarantees (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Guarantor Obligations [Line Items]
Derivative Liabilities	$ 19,846	$ 8,074
Notional amount of underlying interest rate swaps associated with risk participation agreements	2,134,000	$ 1,963,178
Financial Standby Letter Of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit, net liability	2,200
Contractual amount of letters of credit, guaranteed maximum potential future payments	377,500
Risk Participation Agreement [Member] | Indirect Guarantee Of Indebtedness [Member]
Guarantor Obligations [Line Items]
Derivative Liabilities	67
Notional amount of underlying interest rate swaps associated with risk participation agreements	$ 103,200
Minimum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	2 years
Maximum [Member] | Risk Participation Agreement [Member]
Guarantor Obligations [Line Items]
Term, in years	11 years

Pension Pension (Narrative) (De

Pension Pension (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018USD ($)
Pension (Narrative) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0

Pension (Net Pension Cost) (Det

Pension (Net Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension [Abstract]
Service cost - benefits earned during the period	$ 152	$ 128	$ 305	$ 257
Interest cost on projected benefit obligation	951	973	1,901	1,946
Expected Return on Plan Assets	(1,438)	(1,438)	(2,875)	(2,876)
Amortization of Prior Service Cost	(67)	(68)	(135)	(136)
Defined Benefit Plan, Amortization of Gain (Loss)	(592)	(617)	(1,184)	(1,234)
Net periodic pension cost	$ 190	$ 212	$ 380	$ 425

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Commerce Bancshares, Inc.	$ 110,330	$ 78,960	$ 211,314	$ 150,464
Preferred Stock Dividends	2,250	2,250	4,500	4,500
Net Income (Loss) Available to Common Stockholders	$ 108,080	$ 76,710	$ 206,814	$ 145,964
Basic income per common share	$ 1.02	$ 0.71	$ 1.94	$ 1.36
Diluted income per common share	$ 1.01	$ 0.71	$ 1.93	$ 1.36
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.	$ 110,330	$ 78,960	$ 211,314	$ 150,464
Preferred Stock Dividends	2,250	2,250	4,500	4,500
Net Income (Loss) Available to Common Stockholders	108,080	76,710	206,814	145,964
Less income allocated to nonvested restricted stockholders	1,139	943	2,260	1,888
Net income available to common stockholders	$ 106,941	$ 75,767	$ 204,554	$ 144,076
Weighted average common shares outstanding	105,686	105,583	105,660	105,486
Basic income per common share	$ 1.02	$ 0.71	$ 1.94	$ 1.36
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	$ 108,080	$ 76,710	$ 206,814	$ 145,964
Less income allocated to nonvested restricted stockholders	1,136	941	2,254	1,883
Net income available to common stockholders	$ 106,944	$ 75,769	$ 204,560	$ 144,081
Weighted average common shares outstanding	105,686	105,583	105,660	105,486
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods	343	360	338	389
Weighted average diluted common shares outstanding	106,029	105,943	105,998	105,875
Diluted income per common share	$ 1.01	$ 0.71	$ 1.93	$ 1.36

Common Stock Common Stock (Anti

Common Stock Common Stock (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	295	132

Accumulated Other Comprehensi70

Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income		$ (108,781,000)	$ 42,070,000	$ (108,781,000)	$ 42,070,000	$ 14,108,000	$ 10,975,000
Other Comprehensive Income Before Reclassifications				(124,027,000)	53,028,000
Reclassified from Accumulated Oher Comprehensive Income				693,000	(2,875,000)
Other Comprehensive Income (Loss), before Tax				(123,334,000)	50,153,000
Other Comprehensive Income (Loss), Tax				30,833,000	(19,058,000)
Other comprehensive income (loss), net of tax		(19,218,000)	11,658,000	(92,501,000)	31,095,000
Reclassification Where Impairment Was Not Previously Recognized				0	0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated other comprehensive income	[1]	4,060,000	3,170,000	4,060,000	3,170,000	3,411,000	2,975,000
Other Comprehensive Income Before Reclassifications	[1]			(173,000)	(44,000)
Reclassified from Accumulated Oher Comprehensive Income	[1]			68,000	320,000
Other Comprehensive Income (Loss), before Tax	[1]			(105,000)	276,000
Other Comprehensive Income (Loss), Tax	[1]			27,000	(105,000)
Other comprehensive income (loss), net of tax	[1]			(78,000)	171,000
Reclassification Where Impairment Was Not Previously Recognized				12,000	24,000
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income	[1]	(89,857,000)	57,547,000	(89,857,000)	57,547,000	30,326,000	27,328,000
Other Comprehensive Income Before Reclassifications	[1]			(123,854,000)	53,072,000
Reclassified from Accumulated Oher Comprehensive Income	[1]			(424,000)	(4,293,000)
Other Comprehensive Income (Loss), before Tax	[1]			(124,278,000)	48,779,000
Other Comprehensive Income (Loss), Tax	[1]			31,068,000	(18,536,000)
Other comprehensive income (loss), net of tax	[1]			(93,210,000)	30,243,000
Reclassification Where Impairment Was Not Previously Recognized				(12,000)	(24,000)
Pension Loss [Member]
Accumulated other comprehensive income	[2]	$ (22,984,000)	$ (18,647,000)	(22,984,000)	(18,647,000)	$ (19,629,000)	$ (19,328,000)
Other Comprehensive Income Before Reclassifications	[2]			0	0
Reclassified from Accumulated Oher Comprehensive Income	[2]			1,049,000	1,098,000
Other Comprehensive Income (Loss), before Tax	[2]			1,049,000	1,098,000
Other Comprehensive Income (Loss), Tax	[2]			(262,000)	(417,000)
Other comprehensive income (loss), net of tax	[2]			787,000	681,000
Reclassification Where Impairment Was Not Previously Recognized				0	$ 0
Accounting Standards Update 2018-02 Member [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				2,932,000
Accounting Standards Update 2018-02 Member [Member] | Unrealized Gain Loss on Securities OTTI [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				715,000
Accounting Standards Update 2018-02 Member [Member] | Unrealized Gain Loss on Securities Other [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				6,359,000
Accounting Standards Update 2018-02 Member [Member] | Pension Loss [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(4,142,000)
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(33,320,000)
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities OTTI [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Accounting Standards Update 2016-01 [Member] | Unrealized Gain Loss on Securities Other [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(33,320,000)
Accounting Standards Update 2016-01 [Member] | Pension Loss [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				$ 0
[1]	The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.
[2]	The requirement to revalue deferred tax assets and liabilities in the period of enactment stranded the effects of the tax rate change, mandated by the Tax Cuts and Jobs Act, in accumulated other comprehensive income. In response, the FASB issued ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which the Company adopted on January 1, 2018. This ASU allowed the reclassification of the stranded tax effects from accumulated other comprehensive income (as shown in the table above) to retained earnings.As mentioned in Note 3, additional new accounting guidance, which was effective January 1, 2018, required the reclassification of unrealized gains on equity securities from accumulated other comprehensive income to retained earnings (also shown above).

Segments Segments (Narrative) (

Segments Segments (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)Locations	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)Locations	Jun. 30, 2017USD ($)
Segments [Abstract]
Number of Operating Segments			3
Segment Reporting Information, Intersegment Revenue | $	$ 0	$ 0	$ 0	$ 0
Number Of Locations | Locations	180		180

Segments (Schedule Of Financial

Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 210,959	$ 182,807	$ 403,851		$ 361,080
Provision for loan losses	(10,043)	(10,758)	(20,439)		(21,886)
Non-interest income	124,850	115,380	244,540		224,993
Investment securities gains (losses), net	(3,075)	1,651	2,335	[1]	879	[1]
Non-interest expense	(181,860)	(176,890)	(364,137)		(356,267)
Income before income taxes	140,831	112,190	266,150		208,799
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	73,471	69,274	144,908		136,628
Provision for loan losses	(10,409)	(10,802)	(20,924)		(20,464)
Non-interest income	32,116	29,617	62,332		56,780
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(72,095)	(68,374)	(142,266)		(135,791)
Income before income taxes	23,083	19,715	44,050		37,153
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	85,721	82,137	167,816		162,007
Provision for loan losses	308	111	488		624
Non-interest income	51,651	46,088	100,862		90,998
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(75,360)	(72,134)	(148,158)		(142,499)
Income before income taxes	62,320	56,202	121,008		111,130
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	11,857	11,934	23,302		23,778
Provision for loan losses	16	24	(48)		1
Non-interest income	42,896	38,852	84,997		76,558
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(30,254)	(29,494)	(62,113)		(59,813)
Income before income taxes	24,515	21,316	46,138		40,524
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	171,049	163,345	336,026		322,413
Provision for loan losses	(10,085)	(10,667)	(20,484)		(19,839)
Non-interest income	126,663	114,557	248,191		224,336
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(177,709)	(170,002)	(352,537)		(338,103)
Income before income taxes	109,918	97,233	211,196		188,807
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	39,910	19,462	67,825		38,667
Provision for loan losses	42	(91)	45		(2,047)
Non-interest income	(1,813)	823	(3,651)		657
Investment securities gains (losses), net	(3,075)	1,651	2,335		879
Non-interest expense	(4,151)	(6,888)	(11,600)		(18,164)
Income before income taxes	$ 30,913	$ 14,957	$ 54,954		$ 19,992
[1]	Available for sale and non-marketable securities

Derivative Instruments Derivati

Derivative Instruments Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments [Abstract]
Variation Margin Impact to Positive Fair Values of Cleared Swaps	$ 15.9	$ 4.5
Variation Margin Impact to Negative Fair Values of Cleared Swaps	$ 1.5	$ 4.3

Derivative Instruments (Schedul

Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount of Derivatives	$ 2,134,000	$ 1,963,178
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,891,877	1,741,412
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	31,483	31,776
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	152,402	133,488
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	8,737	11,826
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	21,653	17,110
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	2,848	2,566
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 25,000	$ 25,000

Derivative Instruments (Sched75

Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 6,239	$ 8,349
Other liabilities	(19,846)	(8,074)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	5,265	7,674
Other liabilities	(19,616)	(7,857)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	20	16
Other liabilities	(20)	(16)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	21	46
Other liabilities	(67)	(123)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	194	21
Other liabilities	(31)	(40)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	730	580
Other liabilities	0	0
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	8	8
Other liabilities	(1)	(7)
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	4
Other liabilities	$ (111)	$ (31)

Derivative Instruments (Summary

Derivative Instruments (Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 2,061	$ 206	$ 3,282	$ 861
Other Non-Interest Income [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	1,727	456	2,232	599
Other Non-Interest Income [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	16	1	180	11
Other Non-Interest Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	173	(55)	182	(75)
Loans Fees And Sales [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	148	(32)	149	522
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	(4)	6	62
Loans Fees And Sales [Member] | Forward TBA Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (9)	$ (160)	$ 533	$ (258)

Derivative Instruments Deriva77

Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	$ 6,239	$ 8,349
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Assets	6,239	8,349
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	19,846	8,074
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liabilities	19,846	8,074
Derivative Subject to Master Netting Agreement [Member]
Derivative Asset, Fair Value, Gross Asset	5,338	7,726
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Net Amount Presented in the Balance Sheet	5,338	7,726
Derivative Asset, Not Offset, Policy Election Deduction	(491)	(233)
derivatve asset, fair value of collateral	(2,114)	(824)
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,733	6,669
Derivative Liability, Fair Value, Gross Liability	19,777	7,935
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Net Amount Presented in the Balance Sheet	19,777	7,935
Derivative Liability, Not Offset, Policy Election Deduction	(491)	(233)
Derivative Liability, Fair Value of Collateral	(354)	(1,570)
Derivative Liability, Fair Value, Amount Offset Against Collateral	18,932	6,132
Derivative Not Subject to Master Netting Agreement [Member]
Derivative Asset, Fair Value, Gross Asset	901	623
Derivative Asset, Amount Offset by Liabiilty	0	0
Derivative Asset, Not Subject to Master Netting Arrangement	901	623
Derivative Liability, Fair Value, Gross Liability	69	139
Derivative Liability, Amount Offset by Asset	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 69	$ 139

Resale and Repurchase Agreeme78

Resale and Repurchase Agreements Resale and Repurchase Agreements (Narrative) (Details) - Collateral Swap [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Collateral Swap Agreements	$ 550	$ 650
Collateral Already Posted, Aggregate Fair Value	557
Collateral Accepted, Aggregate Fair Value	$ 556

Resale and Repurchase Agreeme79

Resale and Repurchase Agreements Resale and Repurchase Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Securities purchased under agreements to resell	$ 700,000	$ 700,000
Resale agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Purchased under Agreements to Resell, Gross	1,250,000	1,350,000
Securities Purchased under Agreements to Resell, Liability	(550,000)	(650,000)
Securities purchased under agreements to resell	700,000	700,000
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(698,414)	(700,000)
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	1,586	0
Repurchase agreement [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	1,585,074	1,954,768
Securities Sold under Agreements to Repurchase, Asset	(550,000)	(650,000)
Securities Sold under Agreements to Repurchase	1,035,074	1,304,768
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,035,074)	(1,304,768)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	$ 0	$ 0

Resale and Repurchase Agreeme80

Resale and Repurchase Agreements Remaining Contractual Maturities of Repurchase Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
U.S. Government And Federal Agency Obligations [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 253,662	$ 271,820
U.S. Government And Federal Agency Obligations [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	1,731
U.S. Government And Federal Agency Obligations [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	350,000	450,000
U.S. Government And Federal Agency Obligations [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	603,662	723,551
Government-Sponsored Enterprise Obligations [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	63,916	149,111
Government-Sponsored Enterprise Obligations [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Government-Sponsored Enterprise Obligations [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Government-Sponsored Enterprise Obligations [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	63,916	149,111
Agency Mortgage-Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	518,375	737,975
Agency Mortgage-Backed Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	22,850	9,750
Agency Mortgage-Backed Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	202,750	200,000
Agency Mortgage-Backed Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	743,975	947,725
Non Agency Mortgage Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	10,591	0
Non Agency Mortgage Backed Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non Agency Mortgage Backed Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Non Agency Mortgage Backed Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	10,591	0
Asset-Backed Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	56,335	89,601
Asset-Backed Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	75,000	30,000
Asset-Backed Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Asset-Backed Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	131,335	119,601
Other Debt Securities [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	31,595	14,780
Other Debt Securities [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other Debt Securities [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	0	0
Other Debt Securities [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	31,595	14,780
Repurchase Agreements [Member] | Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	934,474	1,263,287
Repurchase Agreements [Member] | Maturity up to 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	97,850	41,481
Repurchase Agreements [Member] | Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	552,750	650,000
Repurchase Agreements [Member] | Total Repurchase Agreements [Member] [Domain]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	$ 1,585,074	$ 1,954,768

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3.1	$ 3.1	$ 6.4	$ 6.2
Nonvested Stock Award [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Nonvested Stock Award [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			7 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Contractual terms of stock options granted (in years)			10 years

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary Of The Status Of Nonvested Share Awards) (Details)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Nonvested Share Awards [Roll Forward]
Nonvested, Shares, Beginning Balance | shares	1,254,518
Granted, Shares | shares	225,764
Vested, Shares | shares	(344,830)
Forfeited, Shares | shares	(15,049)
Nonvested, Shares, Ending Balance | shares	1,120,403
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 38.67
Granted , Weighted Average Grant Date Fair Value | $ / shares	59.23
Vested , Weighted Average Grant Date Fair Value | $ / shares	32.27
Forfeited , Weighted Average Grant Date Fair Value | $ / shares	45.88
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 44.69

Stock-Based Compensation Stock-

Stock-Based Compensation Stock-Based Compensation (Current Year Per Share Average Fair Value and Valuation Model Assumptions) (Details)	6 Months Ended
	Jun. 30, 2018$ / shares
Current Year Per Share Average Fair Value and Valuation Model Assumptions [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 12.44
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	20.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 7 months

Stock-Based Compensation (Sum84

Stock-Based Compensation (Summary Of SAR Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares	1,112,382	1,179,286
Granted, Shares	168,716
Forfeited, Shares	(8,856)
Expired, Shares	(276)
Exercised, Shares	(226,488)
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 37.13
Granted, Weighted Average Exercise Price	58.42
Forfeited, Weighted Average Exercise Price	46.86
Expired, Weighted Average Exercise Price	43.52
Exercised, Weighted Average Exercise Price	29.82
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 41.77
Outstanding, Weighted Average Remaining Contractual Term (in years)	7 years 1 month
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 25,584

Revenue from Contracts with C85

Revenue from Contracts with Customers Revenue from Contracts with Customers (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018Rate
Revenue from Contract with Customer [Abstract]
Percent of Revenue not in scope of ASC 606	62.00%

Revenue from Contracts with C86

Revenue from Contracts with Customers Reclassification of Bank Card Transaction Fees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 43,215	$ 37,295	$ 84,668	$ 73,046
Non-interest income	124,850	115,380	244,540	224,993
Data processing and software	21,016	20,035	41,706	39,940
Other	15,493	15,378	30,867	31,081
Noninterest Expense	$ 181,860	176,890	$ 364,137	356,267
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		44,999		88,203
Non-interest income		123,084		240,150
Data processing and software		23,356		46,453
Other		19,761		39,725
Noninterest Expense		184,594		371,424
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		(7,704)		(15,157)
Non-interest income		(7,704)		(15,157)
Data processing and software		(3,321)		(6,513)
Other		(4,383)		(8,644)
Noninterest Expense		(7,704)		(15,157)
As Adjusted for New Accounting Pronouncement [Domain]
Reclassification of Bank Card Transaction Fees [Line Items]
Bank card transaction fees		37,295		73,046
Non-interest income		115,380		224,993
Data processing and software		20,035		39,940
Other		15,378		31,081
Noninterest Expense		$ 176,890		$ 356,267

Revenue from Contracts with C87

Revenue from Contracts with Customers (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Non-interest income	$ 124,850	$ 115,380	$ 244,540	$ 224,993
Revenue from Contracts with Customers In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	114,967	105,572	226,543	206,525
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Bank Card Transaction Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	43,215	37,295	84,668	73,046
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Trust Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	37,036	33,120	73,098	65,134
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Deposit Account Charges and Other Fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	23,893	22,861	46,875	44,803
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Consumer Brokerage Services [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	3,971	3,726	7,739	7,375
Revenue from Contracts with Customers In Scope of ASC 606 [Member] | Other Non-Interest Income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	6,852	8,570	14,163	16,167
Revenue Not In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	$ 9,883	$ 9,808	$ 17,997	$ 18,468

Revenue from Contracts with C88

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Bank Card Transaction Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 11,104	$ 13,315	$ 10,878	$ 14,686
Trust Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	2,893	2,802	3,227	2,681
Deposit Account Charges and Other Fees [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	5,773	5,597	5,471	5,735
Consumer Brokerage Services [Member]
Contract with Customer, Asset and Liability [Line Items]
Contract with Customer, Receivable	$ 924	$ 380	$ 345	$ 309

Revenue from Contracts with C89

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Bank Card Transaction Fees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ 43,215	$ 37,295	$ 84,668	$ 73,046
Debit Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	10,207	8,404	19,598	16,395
Debit Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	10,582	10,325	20,344	19,966
Debit Card Fees [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(375)	(1,921)	(746)	(3,571)
Credit Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	3,496	3,560	6,597	6,554
Credit Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	6,800	6,483	12,845	12,223
Credit Card Fees [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(3,304)	(2,923)	(6,248)	(5,669)
Corporate Card Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	24,620	19,896	48,788	39,860
Corporate Card Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	49,141	43,261	97,017	85,680
Corporate Card Fees [Member] | Network Charges and Rewards Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(24,521)	(23,365)	(48,229)	(45,820)
Merchant Fees [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	4,892	5,435	9,685	10,237
Merchant Fees [Member] | Fee income [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	7,606	8,350	14,907	16,289
Merchant Fees [Member] | Network Charges Expense [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	(836)	(835)	(1,619)	(1,883)
Merchant Fees [Member] | Fees to Cardholder Banks [Member]
Bank Card Transaction Fees [Line Items]
Bank card transaction fees	$ (1,878)	$ (2,080)	$ (3,603)	$ (4,169)

Revenue from Contracts with C90

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Trust Fees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Trust Fees [Line Items]
Trust fees	$ 37,036	$ 33,120	$ 73,098	$ 65,134
Private Client [Member]
Trust Fees [Line Items]
Trust fees	27,987	24,701	54,855	48,463
Institutional [Member]
Trust Fees [Line Items]
Trust fees	7,271	6,751	14,682	13,245
Other Trust Fees [Member]
Trust Fees [Line Items]
Trust fees	$ 1,778	$ 1,668	$ 3,561	$ 3,426

Revenue from Contracts with C91

Revenue from Contracts with Customers Revenue from Contracts with Customers (Schedule of Deposit Account Charges and Other Fees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	$ 23,893	$ 22,861	$ 46,875	$ 44,803
Corporate Cash Management [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	10,095	9,477	19,492	18,388
Overdraft and Return Item [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	7,656	7,448	15,168	14,628
Other Deposit Account Charges [Member]
Deposit Account Charges and Other Fees [Line Items]
Deposit account charges and other fees	$ 6,142	$ 5,936	$ 12,215	$ 11,787

Revenue from Contracts with C92

Revenue from Contracts with Customers Revenue from Contract with Customers (Schedule of Consumer Brokerage Services) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consumer Brokerage Services [Line Items]
Consumer brokerage services	$ 3,971	$ 3,726	$ 7,739	$ 7,375
Commission Income [Member]
Consumer Brokerage Services [Line Items]
Consumer brokerage services	2,269	2,193	4,361	4,423
Managed Account Services [Member]
Consumer Brokerage Services [Line Items]
Consumer brokerage services	$ 1,702	$ 1,533	$ 3,378	$ 2,952

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments	$ 68,940	$ 55,752
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction Rate Securities Available For Sale	15,100
Private equity investments	$ 68,940	$ 55,752

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 10,750,000	$ 15,327,000
U.S. government and federal agency obligations	911,092,000	917,147,000
Government-sponsored enterprise obligations	311,361,000	406,363,000
State and municipal obligations	1,379,164,000	1,611,366,000
Agency mortgage-backed securities	3,131,025,000	3,040,913,000
Non-agency mortgage-backed securities	1,010,331,000	905,793,000
Other asset-backed securities	1,338,542,000	1,492,800,000
Other debt securities	330,861,000	351,060,000
Trading securities	31,156,000	18,269,000
Equity securities with a readily determinable fair value	2,741,000	48,838,000
Private equity investments	68,940,000	55,752,000
Derivative Assets	6,239,000	8,349,000
Assets held in trust for deferred compensation plan	13,790,000	12,843,000
Total Assets	8,545,992,000	8,884,820,000
Derivative Liabilities	19,846,000	8,074,000
Liabilities held in trust for deferred compensation plan	13,790,000	12,843,000
Total Liabilities	33,636,000	20,917,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	911,092,000	917,147,000
Government-sponsored enterprise obligations	0	0
State and municipal obligations	0	0
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Other asset-backed securities	0	0
Other debt securities	0	0
Trading securities	0	0
Equity securities with a readily determinable fair value	2,741,000	19,864,000
Private equity investments	0	0
Derivative Assets	0	0
Assets held in trust for deferred compensation plan	13,790,000	12,843,000
Total Assets	927,623,000	949,854,000
Derivative Liabilities	0	0
Liabilities held in trust for deferred compensation plan	13,790,000	12,843,000
Total Liabilities	13,790,000	12,843,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	10,750,000	15,327,000
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	311,361,000	406,363,000
State and municipal obligations	1,364,091,000	1,594,350,000
Agency mortgage-backed securities	3,131,025,000	3,040,913,000
Non-agency mortgage-backed securities	1,010,331,000	905,793,000
Other asset-backed securities	1,338,542,000	1,492,800,000
Other debt securities	330,861,000	351,060,000
Trading securities	31,156,000	18,269,000
Equity securities with a readily determinable fair value	0	28,974,000
Private equity investments	0	0
Derivative Assets	5,488,000	7,723,000
Assets held in trust for deferred compensation plan	0	0
Total Assets	7,533,605,000	7,861,572,000
Derivative Liabilities	19,779,000	7,951,000
Liabilities held in trust for deferred compensation plan	0	0
Total Liabilities	19,779,000	7,951,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	0	0
U.S. government and federal agency obligations	0	0
Government-sponsored enterprise obligations	0	0
State and municipal obligations	15,073,000	17,016,000
Agency mortgage-backed securities	0	0
Non-agency mortgage-backed securities	0	0
Other asset-backed securities	0	0
Other debt securities	0	0
Trading securities	0	0
Equity securities with a readily determinable fair value	0	0
Private equity investments	68,940,000	55,752,000
Derivative Assets	751,000	626,000
Assets held in trust for deferred compensation plan	0	0
Total Assets	84,764,000	73,394,000
Derivative Liabilities	67,000	123,000
Liabilities held in trust for deferred compensation plan	0	0
Total Liabilities	$ 67,000	$ 123,000

Fair Value Measurements (Summ95

Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 82,629,000	$ 70,705,000	$ 73,271,000	$ 67,760,000
Total gains or losses (realized /unrealized), included in earnings	3,955,000	17,000	8,425,000	(2,297,000)
Total gains or losses (realized /unrealized), included in other comprehensive income	(379,000)	319,000	(246,000)	710,000
Investment Securities Called	(1,715,000)	(600,000)	(1,715,000)	(600,000)
Discount accretion	9,000	23,000	18,000	33,000
Purchase of private equity securities	364,000	2,259,000	5,243,000	7,084,000
Sales And Repayments Of Private Equity Securities	(166,000)	(1,550,000)	(186,000)	(1,550,000)
Capitalized interest/dividends	0	0	35,000	33,000
Sale Of Risk Participation Agreement	0	0	(148,000)	0
Ending balance	84,697,000	71,173,000	84,697,000	71,173,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	4,538,000	920,000	9,006,000	(1,773,000)
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	17,158,000	17,083,000	17,016,000	16,682,000
Total gains or losses (realized /unrealized), included in earnings	0	0	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	(379,000)	319,000	(246,000)	710,000
Investment Securities Called	(1,715,000)	(600,000)	(1,715,000)	(600,000)
Discount accretion	9,000	23,000	18,000	33,000
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
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	15,073,000	16,825,000	15,073,000	16,825,000
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	64,951,000	52,800,000	55,752,000	50,820,000
Total gains or losses (realized /unrealized), included in earnings	3,791,000	48,000	8,096,000	(2,830,000)
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	364,000	2,259,000	5,243,000	7,084,000
Sales And Repayments Of Private Equity Securities	(166,000)	(1,550,000)	(186,000)	(1,550,000)
Capitalized interest/dividends	0	0	35,000	33,000
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	68,940,000	53,557,000	68,940,000	53,557,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	3,791,000	48,000	8,096,000	(2,655,000)
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	520,000	822,000	503,000	258,000
Total gains or losses (realized /unrealized), included in earnings	164,000	(31,000)	329,000	533,000
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
Sale Of Risk Participation Agreement	0	0	(148,000)	0
Ending balance	684,000	791,000	684,000	791,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 747,000	$ 872,000	$ 910,000	$ 882,000

Fair Value Measurements (Summ96

Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 3,955	$ 17	$ 8,425	$ (2,297)
Change in unrealized gains or losses relating to assets still held	4,538	920	9,006	(1,773)
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	147	(32)	149	522
Change in unrealized gains or losses relating to assets still held	730	871	730	871
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	17	1	180	11
Change in unrealized gains or losses relating to assets still held	17	1	180	11
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	3,791	48	8,096	(2,830)
Change in unrealized gains or losses relating to assets still held	$ 3,791	$ 48	$ 8,096	$ (2,655)

Fair Value Measurements (Summ97

Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details)	6 Months Ended
	Jun. 30, 2018Rate
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Unobservable Input, Estimated market recovery period	5 years
Auction Rate Securities [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input, Estimated market rate	3.70%
Auction Rate Securities [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable Input, Estimated market rate	5.90%
Private Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Market comparable companies	Market comparable companies
Private Equity Investments [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	4
Private Equity Investments [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6
Mortgage Loan Commitments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique, Discounted cash flow	Discounted cash flow
Weighted Average, Probability of Funding	80.40%
Weighted Average, Embedded Servicing Value	1.30%
Mortgage Loan Commitments [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	50.50%
Embedded Servicing Value	0.50%
Mortgage Loan Commitments [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Probability of Funding	98.80%
Embedded Servicing Value	2.40%

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 175	$ 2,044
Loans Nonrecurring Basis Gains (Losses)	(118)	(550)
Mortgage servicing rights	5,463	3,646
Mortgage Servicing Rights Nonrecurring Basis Gains (Losses)	9	6
Foreclosed assets	47	75
Foreclosed Assets Nonrecurring Basis Gains (Losses)	(47)	(58)
Long-lived assets	914	1,834
Long Lived Assets Nonrecurring Basis Gains (Losses)	(552)	(343)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long-lived assets	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long-lived assets	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	175	2,044
Mortgage servicing rights	5,463	3,646
Foreclosed assets	47	75
Long-lived assets	$ 914	$ 1,834

Fair Value Of Financial Instr99

Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	$ 10,800
Securities purchased under agreements to resell	700,000	$ 700,000
Interest earning deposits with banks	114,947	30,631
Cash and due from banks	386,339	438,439
Derivative Assets	6,239	8,349
Assets held in trust for deferred compensation plan	13,790	12,843
Non-interest bearing deposits	6,876,756	7,158,962
Savings, interest checking and money market deposits	11,761,832	11,499,620
Other Borrowings	9,291	1,758
Derivative Liabilities	19,846	8,074
Liabilities held in trust for deferred compensation plan	13,790	12,843
Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	0	0
Assets held in trust for deferred compensation plan	13,790	12,843
Derivative Liabilities	0	0
Liabilities held in trust for deferred compensation plan	13,790	12,843
Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	5,488	7,723
Assets held in trust for deferred compensation plan	0	0
Derivative Liabilities	19,779	7,951
Liabilities held in trust for deferred compensation plan	0	0
Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	751	626
Assets held in trust for deferred compensation plan	0	0
Derivative Liabilities	67	123
Liabilities held in trust for deferred compensation plan	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,954,111	13,983,674
Loans held for sale	20,352	21,398
Investments, Fair Value Disclosure	8,560,285	8,893,307
Federal funds sold	31,500	42,775
Securities purchased under agreements to resell	700,000	700,000
Interest earning deposits with banks	114,947	30,631
Cash and due from banks	386,339	438,439
Derivative Assets	6,239	8,349
Assets held in trust for deferred compensation plan	13,790	12,843
Assets, Fair Value Disclosure	23,787,563	24,131,416
Non-interest bearing deposits	6,876,756	7,158,962
Savings, interest checking and money market deposits	11,761,832	11,499,620
Time open and certificates of deposits	1,682,969	1,766,864
Federal Funds Purchased, Fair Value Disclosure	131,685	202,370
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	1,035,074	1,304,768
Other Borrowings	9,291	1,758
Derivative Liabilities	19,846	8,074
Liabilities held in trust for deferred compensation plan	13,790	12,843
Financial Liabilities Fair Value Disclosure	21,531,243	21,955,259
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,990,298	4,958,554
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	967,151	968,820
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,727,580	2,697,452
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,102,586	2,062,787
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,012,644	2,104,487
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	374,557	400,587
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	775,214	783,864
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,081	7,123
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,648,345	13,993,509
Loans held for sale	20,352	21,398
Investments, Fair Value Disclosure	8,560,285	8,893,307
Federal funds sold	31,500	42,775
Securities purchased under agreements to resell	680,830	695,194
Interest earning deposits with banks	114,947	30,631
Cash and due from banks	386,339	438,439
Derivative Assets	6,239	8,349
Assets held in trust for deferred compensation plan	13,790	12,843
Assets, Fair Value Disclosure	23,462,627	24,136,445
Non-interest bearing deposits	6,876,756	7,158,962
Savings, interest checking and money market deposits	11,761,832	11,499,620
Time open and certificates of deposits	1,682,894	1,768,780
Federal Funds Purchased, Fair Value Disclosure	131,685	202,370
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	1,035,558	1,305,375
Other Borrowings	9,291	1,758
Derivative Liabilities	19,846	8,074
Liabilities held in trust for deferred compensation plan	13,790	12,843
Financial Liabilities Fair Value Disclosure	21,531,652	21,957,782
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,890,517	4,971,401
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	962,276	979,389
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,689,312	2,702,598
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,038,381	2,060,443
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,976,911	2,074,129
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	367,886	400,333
Estimate of Fair Value, Fair Value Disclosure [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	720,044	798,093
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,018	7,123
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Loans held for sale	0	0
Investments, Fair Value Disclosure	913,833	937,011
Federal funds sold	31,500	42,775
Securities purchased under agreements to resell	0	0
Interest earning deposits with banks	114,947	30,631
Cash and due from banks	386,339	438,439
Derivative Assets	0	0
Assets held in trust for deferred compensation plan	13,790	12,843
Assets, Fair Value Disclosure	1,460,409	1,461,699
Non-interest bearing deposits	6,876,756	7,158,962
Savings, interest checking and money market deposits	11,761,832	11,499,620
Time open and certificates of deposits	0	0
Federal Funds Purchased, Fair Value Disclosure	131,685	202,370
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	0	0
Other Borrowings	0	0
Derivative Liabilities	0	0
Liabilities held in trust for deferred compensation plan	13,790	12,843
Financial Liabilities Fair Value Disclosure	18,784,063	18,873,795
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Loans held for sale	20,352	21,398
Investments, Fair Value Disclosure	7,517,367	7,838,522
Federal funds sold	0	0
Securities purchased under agreements to resell	0	0
Interest earning deposits with banks	0	0
Cash and due from banks	0	0
Derivative Assets	5,488	7,723
Assets held in trust for deferred compensation plan	0	0
Assets, Fair Value Disclosure	7,543,207	7,867,643
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Time open and certificates of deposits	0	0
Federal Funds Purchased, Fair Value Disclosure	0	0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	0	0
Other Borrowings	7,682	0
Derivative Liabilities	19,779	7,951
Liabilities held in trust for deferred compensation plan	0	0
Financial Liabilities Fair Value Disclosure	27,461	7,951
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,648,345	13,993,509
Loans held for sale	0	0
Investments, Fair Value Disclosure	129,085	117,774
Federal funds sold	0	0
Securities purchased under agreements to resell	680,830	695,194
Interest earning deposits with banks	0	0
Cash and due from banks	0	0
Derivative Assets	751	626
Assets held in trust for deferred compensation plan	0	0
Assets, Fair Value Disclosure	14,459,011	14,807,103
Non-interest bearing deposits	0	0
Savings, interest checking and money market deposits	0	0
Time open and certificates of deposits	1,682,894	1,768,780
Federal Funds Purchased, Fair Value Disclosure	0	0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure	1,035,558	1,305,375
Other Borrowings	1,609	1,758
Derivative Liabilities	67	123
Liabilities held in trust for deferred compensation plan	0	0
Financial Liabilities Fair Value Disclosure	2,720,128	3,076,036
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,890,517	4,971,401
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	962,276	979,389
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,689,312	2,702,598
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,038,381	2,060,443
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,976,911	2,074,129
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	367,886	400,333
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	720,044	798,093
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 3,018	$ 7,123