Webster Financial (WBS) 10-K29 Feb 162015 FY Annual reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2015	Feb. 12, 2016	Jun. 30, 2015
Document Documentand Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	WBS
Entity Registrant Name	WEBSTER FINANCIAL CORPORATION
Entity Central Index Key	801,337
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		91,424,421
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,528,266,020

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and due from banks		$ 251,258	$ 261,544
Interest-bearing deposits		155,907	132,695
Securities available-for-sale, at fair value		2,984,631	2,793,873
Securities held-to-maturity (fair value of $3,961,534 and $3,948,706)		3,923,052	3,872,955
Federal Home Loan Bank and Federal Reserve Bank stock		188,347	193,290
Loans held for sale		37,091	67,952
Total Loans and Leases	[1],[2]	15,671,735	13,900,025
Allowance for loan and lease losses		(174,990)	(159,264)
Loans and leases, net		15,496,745	13,740,761
Deferred tax asset, net		101,578	73,873
Premises and equipment, net		129,426	121,933
Goodwill		538,373	529,887
Other intangible assets, net		39,326	2,666
Cash surrender value of life insurance policies		503,093	440,073
Accrued interest receivable and other assets		328,993	301,670
Total assets		24,677,820	22,533,172
Liabilities and shareholders' equity:
Non-interest-bearing		3,713,063	3,598,872
Interest-bearing		14,239,715	12,052,733
Total deposits		17,952,778	15,651,605
Securities sold under agreements to repurchase and other borrowings		1,151,400	1,250,756
Federal Home Loan Bank advances		2,664,139	2,859,431
Long-term debt		226,356	226,237
Accrued expenses and other liabilities		267,576	222,328
Total liabilities		22,262,249	20,210,357
Shareholders’ equity:
Common stock, $.01 par value: Authorized - 200,000,000 shares: Issued 93,651,601 and 93,623,090 shares		937	936
Paid-in capital		1,124,325	1,127,534
Retained earnings		1,317,559	1,202,251
Treasury stock, at cost (2,090,409 and 3,241,555 shares)		(71,854)	(103,294)
Accumulated other comprehensive loss, net of tax		(78,106)	(56,261)
Total shareholders' equity		2,415,571	2,322,815
Total liabilities and shareholders' equity		24,677,820	22,533,172
Series A Preferred Stock [Member]
Shareholders’ equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series A issued and outstanding - 28,939 shares and Series E issued and outstanding - 5,060 shares		0	28,939
Series E Preferred Stock [Member]
Shareholders’ equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series A issued and outstanding - 28,939 shares and Series E issued and outstanding - 5,060 shares		$ 122,710	$ 122,710

[1]	Accrued interest of $43.1 million and $38.4 million at December 31, 2015 and December 31, 2014, respectively, are not included in the loan and lease balances.
[2]	Loan and lease balances include net deferred fees and unamortized premiums of $18.0 million and $10.6 million at December 31, 2015 and December 31, 2014, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Security held-to-maturity, fair value	$ 3,961,534	$ 3,948,706
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Common stock par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	93,651,601	93,623,090
Treasury stock, shares	2,090,409	3,241,555
Series A Preferred Stock [Member]
Preferred stock, shares issued	0	28,939
Preferred Stock, Shares Outstanding	0	28,939
Series E Preferred Stock [Member]
Preferred stock, shares issued	5,060	5,060
Preferred Stock, Shares Outstanding	5,060	5,060

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income:
Interest and fees on loans and leases	$ 552,441	$ 511,612	$ 489,372
Taxable interest and dividends on securities	190,061	189,408	174,579
Non-taxable interest on securities	15,948	17,064	21,621
Loans held for sale	1,590	857	2,068
Total interest income	760,040	718,941	687,640
Interest Expense:
Deposits	46,031	44,162	46,582
Securities sold under agreements to repurchase and other borrowings	16,861	19,388	20,800
Federal Home Loan Bank advances	22,858	16,909	16,229
Long-term debt	9,665	10,041	7,301
Total interest expense	95,415	90,500	90,912
Net interest income	664,625	628,441	596,728
Provision for loan and lease losses	49,300	37,250	33,500
Net interest income (loss) after provision for loan and lease losses	615,325	591,191	563,228
Non-interest Income:
Deposit service fees	136,578	103,431	98,968
Loan and lease related fees	25,594	23,212	21,860
Wealth and investment services	32,486	34,946	34,771
Mortgage banking activities	7,795	4,070	16,359
Increase in cash surrender value of life insurance policies	13,020	13,178	13,770
Gain on sale of investment securities, net	609	5,499	712
Impairment loss on securities recognized in earnings	(110)	(1,145)	(7,277)
Other income	23,573	18,917	11,887
Total non-interest income	239,545	202,108	191,050
Non-interest Expense:
Compensation and benefits	297,517	270,151	264,835
Occupancy	48,836	47,325	48,794
Technology and equipment	80,026	61,993	60,326
Intangible assets amortization	6,340	2,685	4,919
Marketing	16,053	15,379	15,502
Professional and outside services	11,156	8,296	9,532
Deposit insurance	24,042	22,670	21,114
Other expense	70,584	73,101	72,687
Total non-interest expense	554,554	501,600	497,709
Income before income tax expense	300,316	291,699	256,569
Income tax expense	93,976	91,973	77,113
Net income	206,340	199,726	179,456
Preferred Stock Dividends and Other Adjustments	(9,371)	(11,230)	(11,420)
Earnings applicable to common shareholders	$ 196,969	$ 188,496	$ 168,036
Earnings per common share:
Earnings per common share, Basic (in dollars per share)	$ 2.17	$ 2.10	$ 1.90
Earnings per common share, Diluted (in dollars per share)	$ 2.15	$ 2.08	$ 1.86

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 52,579	$ 51,536	$ 52,503	$ 49,722	$ 51,006	$ 50,457	$ 47,834	$ 50,429	$ 206,340	$ 199,726	$ 179,456
Other comprehensive (loss) income, net of tax:
Total available-for-sale and transferred securities									(22,828)	19,038	(45,358)
Total derivative instruments									2,550	(7,324)	9,696
Total defined benefit pension and postretirement benefit plans									(1,567)	(19,426)	19,379
Other comprehensive loss, net of tax									(21,845)	(7,712)	(16,283)
Comprehensive income									$ 184,495	$ 192,014	$ 163,173

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Series A Preferred Stock [Member]	Series E Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Series A Preferred Stock [Member]	Retained Earnings [Member]Series E Preferred Stock [Member]	Treasury Stock, at cost [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member]
Beginning Balance at Dec. 31, 2012	$ 2,093,530			$ 151,649	$ 907	$ 1,145,620	$ 1,000,427			$ (172,807)	$ (32,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	179,456						179,456
Other comprehensive loss, net of tax	(16,283)										(16,283)
Dividends and dividend equivalents declared on common stock	(49,145)					19	(49,164)
Dividends on preferred stock $85.00, $85.00, and $21.25 per share on Series A for 2013, 2014, and 2015, respectively and $1,648.89, $1,600.00, and $1,600.00 per share on Series E for 2013, 2014 and 2015, respectively		$ (2,460)	$ (8,343)					$ (2,460)	$ (8,343)
Common stock issued	731				27	(20,737)	(36,256)			57,697
Stock-based compensation, net of tax impact	9,575					2,813	(3,265)			10,027
Exercise of stock options	2,736					(2,101)				4,837
Shares acquired related to employee share-based compensation plans	(672)									(672)
Common stock warrants repurchased	(30)					(30)
Ending Balance at Dec. 31, 2013	2,209,348			151,649	934	1,125,584	1,080,648			(100,918)	(48,549)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principal	253						253
Net income	199,726						199,726
Other comprehensive loss, net of tax	(7,712)										(7,712)
Dividends and dividend equivalents declared on common stock	(67,690)					57	(67,747)
Dividends on preferred stock $85.00, $85.00, and $21.25 per share on Series A for 2013, 2014, and 2015, respectively and $1,648.89, $1,600.00, and $1,600.00 per share on Series E for 2013, 2014 and 2015, respectively		(2,460)	(8,096)					(2,460)	(8,096)
Common stock issued	435				2	433
Stock-based compensation, net of tax impact	10,113					3,223	180			6,710
Exercise of stock options	2,221					(1,760)				3,981
Shares acquired related to employee share-based compensation plans	(2,326)									(2,326)
Common stock repurchased	(10,741)									(10,741)
Common stock warrants repurchased	(3)					(3)
Ending Balance at Dec. 31, 2014	2,322,815			151,649	936	1,127,534	1,202,251			(103,294)	(56,261)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	206,340						206,340
Other comprehensive loss, net of tax	(21,845)										(21,845)
Dividends and dividend equivalents declared on common stock	(81,197)					119	(81,316)
Dividends on preferred stock $85.00, $85.00, and $21.25 per share on Series A for 2013, 2014, and 2015, respectively and $1,648.89, $1,600.00, and $1,600.00 per share on Series E for 2013, 2014 and 2015, respectively		$ (615)	$ (8,096)					$ (615)	$ (8,096)
Common stock issued	0				1	(1)
Preferred stock conversion	0			(28,939)		(3,429)				32,368
Stock-based compensation, net of tax impact	12,947					2,906	(1,005)			11,046
Exercise of stock options	3,060					(2,781)				5,841
Shares acquired related to employee share-based compensation plans	(5,251)									(5,251)
Common stock repurchased	(12,564)									(12,564)
Common stock warrants repurchased	(23)					(23)
Ending Balance at Dec. 31, 2015	$ 2,415,571			$ 122,710	$ 937	$ 1,124,325	$ 1,317,559			$ (71,854)	$ (78,106)

Consolidated Statements of Sha7

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends on common stock and dividend equivalents declared, per share	$ 0.89	$ 0.75	$ 0.55
Series A Preferred Stock [Member]
Dividends on preferred stock, per share	21.25	85	85
Series E Preferred Stock [Member]
Dividends on preferred stock, per share	$ 1,600	$ 1,600	$ 1,648.89

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities:
Net income	$ 206,340	$ 199,726	$ 179,456
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	49,300	37,250	33,500
Deferred tax (benefit) expense	(15,513)	(5,154)	11,499
Depreciation and amortization	34,678	30,585	36,019
Amortization of earning assets and funding premium/discount, net	54,555	50,758	61,395
Stock-based compensation	10,935	10,223	10,664
Gain on sale, net of write-down, on foreclosed and repossessed assets	(311)	(1,297)	(1,295)
(Gain) loss on sale, net of write-down, on premises and equipment	(244)	(292)	1,287
Impairment loss on securities recognized in earnings	110	1,145	7,277
Gain on the sale of investment securities, net	(609)	(5,499)	(712)
Increase in cash surrender value of life insurance policies	(13,020)	(13,178)	(13,770)
Gain from life insurance policies	(220)	(2,229)	(1,070)
Gain, net on sale of loans held for sale	(7,795)	(4,070)	(16,359)
Proceeds from sale of loans held for sale	452,590	287,132	773,887
Originations of loans held for sale	(449,048)	(296,996)	(687,090)
Net (increase) decrease in accrued interest receivable and other assets	(49,899)	(24,502)	84,077
Net increase (decrease) in accrued expenses and other liabilities	35,336	9,213	(14,812)
Net cash provided by operating activities	307,185	272,815	463,953
Investing Activities:
Net (increase) decrease in interest-bearing deposits	(23,212)	(109,021)	31,761
Purchases of available-for-sale securities	(903,240)	(217,920)	(952,995)
Proceeds from maturities and principal payments of available-for-sale securities	558,301	416,821	741,467
Proceeds from sales of available-for-sale securities	123,270	98,402	57,804
Purchases of held-to-maturity securities	(761,033)	(1,113,958)	(989,397)
Proceeds from maturities and principal payments of held-to-maturity securities	681,124	575,009	717,601
Net proceeds (purchase) of Federal Home Loan Bank stock	4,943	(34,412)	(3,248)
Net increase in loans	(1,813,811)	(1,269,290)	(741,818)
Proceeds from loans not originated for sale	33,644	0	12,771
Purchase of life insurance policies	(50,000)	0	0
Proceeds from life insurance policies	3,912	2,178	1,768
Proceeds from the sale of foreclosed properties and repossessed assets	10,511	8,995	7,745
Proceeds from the sale of premises and equipment	650	3,565	1,304
Purchases of premises and equipment	(36,115)	(30,039)	(21,886)
Acquisition of business, net cash acquired	1,396,414	0	0
Net cash (used for) provided by investing activities	(774,642)	(1,669,670)	(1,137,123)
Financing Activities:
Net increase in deposits	853,921	797,244	323,348
Proceeds from Federal Home Loan Bank advances	13,505,000	10,372,226	4,928,120
Repayments of Federal Home Loan Bank advances	(13,700,279)	(9,565,192)	(4,703,287)
Net (decrease) increase in securities sold under agreements to repurchase and other borrowings	(99,356)	(80,906)	255,502
Issuance of long-term debt	0	150,000	0
Repayment of long-term debt	0	(150,000)	(102,579)
Debt issuance costs	0	(1,349)	0
Dividends paid to common shareholders	(80,964)	(67,431)	(48,952)
Dividends paid to preferred shareholders	(8,711)	(10,556)	(10,803)
Exercise of stock options	3,060	2,221	2,736
Excess tax benefits from stock-based compensation	2,338	1,161	389
Common stock issued	0	435	731
Common stock repurchased	(12,564)	(10,741)	0
Shares acquired related to employee share-based compensation plans	(5,251)	(2,326)	(672)
Common stock warrants repurchased	(23)	(3)	(30)
Net cash (used for) provided by financing activities	457,171	1,434,783	644,503
Net (decrease) increase in cash and due from banks	(10,286)	37,928	(28,667)
Cash and due from banks at beginning of period	261,544	223,616	252,283
Cash and due from banks at end of period	251,258	261,544	223,616
Supplemental disclosure of cash flow information:
Interest paid	95,428	89,942	88,388
Income taxes paid	106,991	102,973	62,926
Noncash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets	8,714	5,532	11,750
Transfer of loans from portfolio to loans held for sale	585	0	106
Deposits assumed in business acquisition	1,446,899	0	0
Preferred stock conversion	$ 28,939	$ 0	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations Webster Financial Corporation (collectively, with its consolidated subsidiaries, “Webster” or the “Company”) is a bank holding company and financial holding company under the Bank Holding Company Act of 1956, as amended, incorporated under the laws of Delaware in 1986 and headquartered in Waterbury, Connecticut. At December 31, 2015 , Webster Financial Corporation's principal asset is all of the outstanding capital stock of Webster Bank, National Association ("Webster Bank"). Webster, through Webster Bank and various non-banking financial services subsidiaries, delivers financial services to individuals, families, and businesses primarily from New York to Massachusetts. Webster provides business and consumer banking, mortgage lending, financial planning, trust, and investment services through banking offices, ATMs, telephone banking, mobile banking and its internet website ( www.websterbank.com or www.wbst.com ). Webster also offers equipment financing, commercial real estate lending, and asset-based lending primarily across the Northeast. On a nationwide basis, through its HSA Bank division, Webster Bank offers and administers health savings accounts, flexible spending accounts, health reimbursement accounts, and commuter benefits. Basis of Presentation The consolidated financial statements include the accounts of Webster Financial Corporation and all other entities in which it has a controlling financial interest. Intercompany accounts and transactions have been eliminated in consolidation. Webster's accounting and financial reporting policies conform, in all material respects, to U.S. Generally Accepted Accounting Principles (“GAAP”) and to general practices within the financial services industry. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on net income, comprehensive income, total assets, total liabilities, total shareholders' equity, net cash provided by operating activities, net cash used for investing activities, and net cash provided by financing activities. Assets that the Company holds or manages in a fiduciary or agency capacity for customers, typically referred to as assets under administration or assets under management are not included in the accompanying Consolidated Balance Sheets since those assets are not Webster's, and the Company is not the primary beneficiary. Variable Interest Entities. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a Variable Interest Entity (“VIE”) under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holder with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company consolidates VIEs in which it has at least a majority of the voting interest. VIEs are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE's economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company owns the common stock of a trust which has issued trust preferred securities. The trust is a VIE in which the Company is not the primary beneficiary and therefore, is not consolidated. The trust's only assets are junior subordinated debentures issued by the Company, which were acquired by the trust using the proceeds from the issuance of the trust preferred securities and common stock. The junior subordinated debentures are included in long-term debt and the Company’s equity interest in the trust is included in other assets in the accompanying Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported in interest expense on long-term debt in the accompanying Consolidated Statements of Income. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of these consolidated financial statements. The allowance for loan and lease losses, the fair value measurements of financial instruments, the valuation of investments for other-than-temporary impairment, the goodwill and intangible assets valuation, income taxes, the, as well as the status of contingencies, are particularly subject to change. Actual results could differ from those estimates. Acquisition On January 13, 2015 (the "acquisition date"), Webster Bank completed its acquisition of the health savings account business of JPMorgan Chase Bank, N.A. The results of the acquisition have been included in the financial statements from the acquisition date. See Note 2: Acquisition for further information. Cash Equivalents Cash equivalents have a maturity of three months or less. Cash and due from banks. Cash equivalents, including cash on hand, certain cash due from banks, and deposits at the Federal Reserve Banks, are referenced as cash and due from banks in the accompanying Consolidated Balance Sheets and Consolidated Statements of Cash Flows. Interest-bearing deposits. Cash equivalents, primarily representing deposits at the Federal Reserve Banks in excess of reserve requirements, and federal funds sold, which essentially represent uncollateralized loans to other financial institutions, are referenced as interest-bearing deposits in the accompanying Consolidated Balance Sheets and Consolidated Statements of Cash Flows. The Company regularly evaluates the credit risk associated with those financial institutions to assess that Webster is not exposed to any significant credit risk on cash equivalents. Investment Securities Investment securities are classified as available-for-sale ("AFS") or held-to-maturity ("HTM") at the time of purchase. Any subsequent change to classification is reviewed for compliance with corporate objectives and accounting policy. Debt securities classified as HTM are those which Webster has the ability and intent to hold to maturity. Securities classified as HTM are recorded at amortized cost net of unamortized premiums and discounts. Discount accretion income and premium amortization expense are recognized as interest income according to a constant yield methodology, with consideration given to prepayment assumptions on mortgage backed securities. Securities classified as AFS are recorded at fair value with unrealized gains and losses recorded as a component of other comprehensive income (“OCI”). Securities transferred from AFS to HTM are recorded at fair value at the time of transfer, and the respective gain or loss is recorded as a separate component of OCI and amortized as an adjustment to interest income over the remaining life of the security. All securities classified as AFS or HTM that are in an unrealized loss position are evaluated for other-than-temporary impairment ("OTTI") on a quarterly basis. The evaluation considers several qualitative factors, including the period of time the security has been in a loss position, and the amount of the unrealized loss. If the Company intends to sell the security or it is more than likely the Company will be required to sell the security prior to recovery of its amortized cost basis, the security is written down to fair value, and the loss is recognized in non-interest income in the accompanying Consolidated Statements of Income. If the Company does not intend to sell the security and it is more likely than not that the Company will not be required to sell the security prior to recovery of its amortized cost basis, only the credit component of the unrealized loss is recorded as an impairment charge to a debt security and recognized as a loss. The remaining loss component would be recorded to accumulated other comprehensive loss in the accompanying Consolidated Balance Sheets. The entire amount of an unrealized loss position of an equity security that is considered OTTI is recorded as an impairment loss in non-interest income in the accompanying Consolidated Statements of Income. The specific identification method is used to determine realized gains and losses on sales of securities. See Note 3: Investment Securities for further information. Federal Home Loan Bank and Federal Reserve Bank Stock Webster Bank is a member of the Federal Home Loan Bank (“FHLB”) of Boston and the Federal Reserve Bank ("FRB") system and is required to maintain an investment in capital stock of the FHLB and FRB. Based on redemption provisions, the stock of both the FHLB and the FRB has no quoted market value and is carried at cost. Membership stock is not reviewed for impairment unless economic circumstances warrant special review. Loans Held for Sale Residential mortgage loans typically are classified as held for sale upon origination based on management's intent to sell such loans. For loans not previously held for sale, once a decision has been made to sell loans, such loans shall be transferred into the loans held for sale classification. The majority of loans held for sale are residential mortgage loans. Loans held for sale are carried at the lower of cost or fair value and are valued on an individual asset basis. Any cost amount in excess of fair value is recorded as a valuation allowance and recognized as a reduction of other income in the Consolidated Statements of Income. Gains or losses on the sale of loans held for sale are recorded as non-interest income. Direct loan origination costs and fees are deferred and recognized as part of the gain or loss at the time of sale. Cash flows from sale of loans made by the Company that were acquired specifically for resale are presented as operating cash flows. All other cash flows from sale of loans are presented as investing cash flows. See Note 5: Transfers of Financial Assets and Mortgage Servicing Assets for further information. Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is generally considered to have been surrendered when: (i) the transferred assets are legally isolated from the Company or its consolidated affiliates, even in bankruptcy or other receivership; (ii) the transferee has the right to pledge or exchange the assets with no conditions that constrain the transferee and provide more than a trivial benefit to the Company; and (iii) the Company does not maintain the obligation or unilateral ability to reclaim or repurchase the assets. The Company sells financial assets in the normal course of business, the majority of which are residential mortgage loan sales primarily to government-sponsored enterprises through established programs, commercial loan sales through participation agreements, and other individual or portfolio loan and securities sales. In accordance with accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. With the exception of servicing and certain performance-based guarantees, the Company’s continuing involvement with financial assets sold is minimal and generally limited to market customary representation and warranty clauses covering certain characteristics of the mortgage loans sold and the Company's origination process. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets, the consideration received, and any liabilities incurred in exchange for the transferred assets. When the Company sells financial assets, it may retain servicing rights and/or other interests in the financial assets. Servicing assets and any other interests held by the Company are recorded at fair value upon transfer, and thereafter are carried at the lower of cost or fair value. See Note 5: Transfers of Financial Assets and Mortgage Servicing Assets for further information. Loans and Leases Loans and leases are stated at the principal amount outstanding, net of amounts charged off, unamortized premiums and discounts, and deferred loan and lease fees/costs which are recognized as yield adjustments using the interest method. These yield adjustments are amortized over the contractual life of the related loans and leases adjusted for estimated prepayments when applicable. Interest on loans and leases is credited to interest income as earned based on the interest rate applied to principal amounts outstanding. Cash flows from loans and leases are presented as investing cash flows. Loans and leases are placed on non-accrual status when collection of principal and interest in accordance with contractual terms is doubtful, generally when principal or interest payments become 90 days delinquent, unless the loan or lease is well secured and in process of collection, or sooner if management concludes circumstances indicate that the borrower may be unable to meet contractual principal or interest payments. Residential real estate loans, excluding loans fully insured against loss and in the process of collection, and consumer loans are placed on non-accrual status at 90 days past due, or at the date when the Company is notified that the borrower is discharged in bankruptcy. A charge-off is recorded at 180 days if the loan balance exceeds the fair value of the collateral less costs to sell. Residential loans that are more than 90 days past due, fully insured against loss, and in the process of collection, remain accruing and are reported as 90 days or more past due and accruing. Commercial, commercial real estate loans, and equipment finance loans or leases are subject to a detailed review when 90 days past due to determine accrual status, or when payment is uncertain and a specific consideration is made to put a loan or lease on non-accrual status. When loans and leases are placed on non-accrual status, the accrual of interest is discontinued, and any unpaid accrued interest is reversed and charged against interest income. If ultimate repayment of a non-accrual loan or lease is expected, any payments received are applied in accordance with contractual terms. If ultimate repayment is not expected on commercial, commercial real estate, and equipment finance loans and leases, any payment received on a non-accrual loan or lease is applied to principal until the unpaid balance has been fully recovered. Any excess is then credited to interest income when received. If the Company determines, through a current valuation analysis, that principal can be repaid on residential real estate and consumer loans, interest payments may be taken into income as received on a cash basis. Except for loans discharged under Chapter 7 of the Bankruptcy Code, loans are removed from non-accrual status when they become current as to principal and interest or demonstrate a period of performance under contractual terms and, in the opinion of management, are fully collectible as to principal and interest. Pursuant to regulatory guidance, a Chapter 7 discharged bankruptcy loan is removed from non-accrual status when the bank expects full repayment of the remaining pre-discharged contractual principal and interest, the loan is a closed-end amortizing loan, it is fully collateralized, and post-discharge the loan had at least six consecutive months of current payments. See Note 4: Loans and Leases for further information. Allowance for Loan and Lease Losses The allowance for loan and lease losses ("ALLL") is a reserve established through a provision for loan and lease losses charged to expense and represents management’s best estimate of probable losses that may be incurred within the existing loan and lease portfolio as of the balance sheet date. The level of the allowance reflects management’s view of trends in losses, current portfolio quality, and present economic, political, and regulatory conditions. Portions of the allowance may be allocated for specific loans and leases; however, the entire allowance is available for any loan or lease that is charged off. A charge-off is recorded on a case-by-case basis when all or a portion of the loan or lease is deemed to be uncollectible. Back-testing is performed to compare original estimated losses and actual observed losses, resulting in ongoing refinements. While management utilizes its best judgment based on the information available at the time, the ultimate adequacy of the allowance is dependent upon a variety of factors that are beyond the Company’s control, which include the performance of the Company’s portfolio, economic conditions, interest rate sensitivity, and the view of the regulatory authorities regarding loan classifications. The ALLL consists of the following three elements: (i) specific valuation allowances established for probable losses on impaired loans and leases; (ii) quantitative valuation allowances calculated using loss experience for like loans and leases with similar characteristics and trends, adjusted, as necessary, to reflect the impact of current conditions; and (iii) qualitative factors determined based on general economic conditions and other factors that may be internal or external to the Company. Loans and leases are considered impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due in accordance with the original contractual terms of the loan agreement, including scheduled principal and interest payments. Impairment is evaluated on a pooled basis for smaller-balance homogeneous residential and consumer loans. Commercial, commercial real estate, and equipment financing loans and leases over a specific dollar amount and all troubled debt restructurings ("TDR") are evaluated individually for impairment. A loan identified as a TDR is considered an impaired loan for the entire term of the loan, with few exceptions. If a loan is impaired, a specific valuation allowance may be established, and the loan is reported net, at the present value of estimated future cash flows using the loan’s original interest rate or at the fair value of collateral less cost to sell if repayment is expected from collateral liquidation. Interest payments on non-accruing impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis. Impaired loans, or portions thereof, are charged off when deemed uncollectible. Factors considered by management in determining impairment include payment status, collateral value, discharged bankruptcy, and the likelihood of collecting scheduled principal and interest payments. Consumer modified loans are analyzed for re-default probability, which is considered when determining the impaired reserve for ALLL. The current or weighted-average (for multiple notes within a commercial borrowing arrangement) interest rate of the loan is used as the discount rate when the interest rate floats with a specified index. A change in terms or payments would be included in the impairment calculation. See Note 4: Loans and Leases for further information. Reserve for Unfunded Commitments The reserve for unfunded commitments provides for probable losses inherent with funding the unused portion of legal commitments to lend. The unfunded reserve calculation includes factors that are consistent with ALLL methodology for funded loans using the loss given default, probability of default, and a draw down factor applied to the underlying borrower risk and facility grades. The reserve for unfunded credit commitments is included within other liabilities in the accompanying Consolidated Balance Sheets, and changes in the reserve are reported as a component of other expense in the accompanying Consolidated Statements of Income. See Note 20: Commitments and Contingencies for further information. Troubled Debt Restructurings A modified loan is considered a TDR when the following two conditions are met: (i) the borrower is experiencing financial difficulties; and (ii) the modification constitutes a concession. The Company considers all aspects of the restructuring in determining whether a concession has been granted, including the debtor's ability to access funds at a market rate. In general, a concession exists when the modified terms of the loan are more attractive to the borrower than standard market terms. Modified terms are dependent upon the financial position and needs of the individual borrower. The most common types of modifications include covenant modifications and forbearance. Loans for which the borrower has been discharged under Chapter 7 bankruptcy are considered collateral dependent TDRs, impaired at the date of discharge, and charged down to the fair value of collateral less cost to sell, if management considers that loss potential likely exists. The Company’s policy is to place consumer loan TDRs, except those that were performing prior to TDR status, on non-accrual status for a minimum period of six months . Commercial TDRs are evaluated on a case-by-case basis for determination of whether or not to place them on non-accrual status. Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months . Initially, all TDRs are reported as impaired. Generally, TDRs are classified as impaired loans and reported as TDRs for the remaining life of the loan. Impaired and TDR classification may be removed if the borrower demonstrates compliance with the modified terms for a minimum of six months and through a fiscal year-end and the restructuring agreement specifies a market rate of interest equal to that which would be provided to a borrower with similar credit at the time of restructuring. In the limited circumstance that a loan is removed from TDR classification, it is the Company’s policy to continue to base its measure of loan impairment on the contractual terms specified by the loan agreement. The Company’s loan and lease portfolio includes loans that have been restructured into an A-Note/B-Note structure as a result of evaluating the cash flow of the borrowers to support repayment. Webster immediately charged off the balances of the B-Notes. The restructuring agreements specify a market interest rate equal to that which would be provided to a borrower with similar credit at the time of restructuring. See Note 4: Loans and Leases for further information. Foreclosed and Repossessed Assets Real estate acquired through foreclosure (“OREO”) or other assets acquired through repossession are carried at the lower of cost or market value less estimated selling costs and are included within other assets in the accompanying Consolidated Balance Sheets. Independent appraisals generally are obtained to substantiate fair value and may be subject to adjustment based upon historical experience or specific geographic trends impacting the property. Within 90 days of a loan being foreclosed upon, the excess of loan balance over fair value less cost to sell is charged off against the allowance for loan and lease losses. Subsequent write-downs in value, maintenance costs as incurred, and gains or losses upon sale are charged to non-interest expense in the accompanying Consolidated Statements of Income. Premises and Equipment Premises and equipment are carried at cost, less accumulated depreciation. Depreciation of premises and equipment is computed on a straight-line basis over the estimated useful lives of the assets, as follows: Building and Improvements 5 - 40 years Leasehold improvements 5 - 20 years (or term or lease, if shorter) Fixtures and equipment 5 - 10 years Data processing and software 3 - 7 years Repairs and maintenance costs are charged to non-interest expense as incurred. Premises and equipment being actively marketed for sale are reclassified as assets held for disposition. The cost and accumulated depreciation relating to premises and equipment retired or otherwise disposed of are eliminated, and any resulting losses are charged to non-interest expense. See Note 6: Premises and Equipment for further information. Goodwill Goodwill represents the excess purchase price of businesses acquired over the fair value of the identifiable net assets acquired and is assigned to specific reporting units. Goodwill is not subject to amortization but rather is evaluated for impairment annually, or more frequently in interim periods if events occur or circumstances change indicating it would more likely than not result in a reduction of the fair value of a reporting unit below its carrying value. Goodwill is evaluated for impairment by either performing a qualitative evaluation or a two-step quantitative test. The qualitative evaluation is an assessment of factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. The Company utilizes an equally weighted combined income and market approach to arrive at an indicated fair value range for the reporting unit. In “Step 1,” the fair value of a reporting unit is compared to its carrying amount, including goodwill, to ascertain if a goodwill impairment exists. If the fair value of the reporting unit exceeds its carrying amount, goodwill of the reporting unit is not considered impaired, and it is not necessary to continue to “Step 2” of the impairment process. Otherwise, Step 2 is performed where the implied fair value of goodwill is compared to the carrying value of goodwill in the reporting unit. If a reporting unit's carrying value exceeds fair value, the difference is charged to non-interest expense. See Note 7: Goodwill and Other Intangible Assets for further information. Other Intangible Assets Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights, or because the asset is capable of being sold or exchanged either separately or in combination with a related contract, asset, or liability. Other intangible assets with finite useful lives are amortized to non-interest expense over their estimated useful lives and are evaluated for impairment whenever events occur or circumstances change indicating the carrying amount of the asset may not be recoverable. Core deposit intangibles resulting from the health savings account acquisition are amortized on an accelerated basis over their estimated useful lives. Core deposit intangibles existing prior to the health savings account acquisition continue to be amortized on a straight line basis over their remaining estimated useful lives. Intangible assets relating to customer relationships are amortized on a straight line basis over their estimated useful lives. See Note 7: Goodwill and Other Intangible Assets for further information. Cash Surrender Value of Life Insurance The investment in life insurance represents the cash surrender value of life insurance policies on certain current and former officers of Webster. Increases in the cash surrender value are recorded as non-interest income. Decreases are the result of collection on the policies due to the death of an insured. Death benefit proceeds in excess of cash surrender value are recorded in other non-interest income when realized. Securities Sold Under Agreements to Repurchase These agreements are accounted for as secured financing transactions since Webster maintains effective control over the transferred securities and the transfer meets the other criteria for such accounting. Obligations to repurchase securities sold are reflected as a liability in the accompanying Consolidated Balance Sheets. The securities underlying the agreements are delivered to a custodial account for the benefit of the dealer or bank with whom each transaction is executed. The dealers or banks, which may sell, loan, or otherwise hypothecate such securities to other parties in the normal course of their operations, agree to resell to Webster the same securities at the maturity date of the agreements. The securities underlying the agreements with Bank customers are pledged; however, the customer does not have ability to hypothecate the underlying securities. See Note 10: Borrowings for further information. Share-Based Compensation Webster maintains an equity incentive plan under which non-qualified stock options, incentive stock options, restricted stock, restricted stock units, or stock appreciation rights may be granted to employees and directors. Share awards are issued from available treasury shares. Stock-based compensation cost is recognized over the requisite service period for the awards, based on the grant-date fair value, net of estimated forfeitures, and is reported as a component of compensation and benefits expense. All awards are subject to a minimum one -year service vesting period. For stock option awards the Black-Scholes Option-Pricing Model is used to measure fair value at the date of grant. For time-based restricted stock and restricted stock unit awards, fair value is measured using the Company's common stock closing price at the date of grant. The Company grants performance-based restricted stock awards that vest after a three year performance period. Awards granted in 2015 and 2014 vest in a range from zero to 150% while awards granted prior to 2014 vest in a range from zero to 200% of the target number of shares under the grant. The Company records compensation expense over the vesting period, based on a fair value. Compensation expense is subject to adjustment based on management's assessment of Webster's return on equity performance relative to the target number of shares condition. Dividends are accrued on the performance-based shares and paid when the performance target is met. See Note 18: Share-Based Plans for further information. Excess tax benefits result when tax return deductions exceed recognized compensation cost determined using the grant-date fair value approach for financial statement purposes. Excess tax benefits are presented as a cash inflow from financing activities and a cash outflow from operating activities. Income Taxes Income tax expense, or benefit, is comprised of two components, current and deferred. The current component reflects taxes payable or refundable for a current period based on applicable tax laws, and the deferred component represents the tax effects of temporary differences between amounts recognized for financial accounting and tax purposes. Deferred tax assets and liabilities reflect the tax effects of such differences that are anticipated to result in taxable or deductible amounts in the future, when the temporary differences reverse. Deferred tax assets are recognized if it is more likely than not they will be realized, and may be reduced by a valuation allowance if it is more likely than not that all or some portion will not be realized. Tax positions that are uncertain but meet a more likely than not recognition threshold are initially and subsequently measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position meets the more likely than not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management's judgment. Webster recognizes interest expense and penalties on uncertain tax positions as a component of income tax expense and recognizes interest income on refundable income taxes as a component of other non-interest income. See Note 8: Income Taxes for further information. Earnings Per Common Share Earnings per common share is computed under the two-class method. Basic earnings per common share is computed by dividing earnings allocated to common shareholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding non-participating securities. Non-vested restricted stock awards are par

Acquisition

Acquisition	12 Months Ended
Acquisition	Dec. 31, 2015
Business Combinations [Abstract]
Acquisition	Acquisition Business Combination On January 13, 2015 Webster Bank completed its acquisition of the health savings account business of JPMorgan Chase Bank, N.A. As a result of the acquisition, the Company became the leading administrator of health savings accounts on a nationwide basis. The acquisition significantly augments a source of stable, low cost, long duration deposits. The acquisition-date fair value of the consideration transferred consisted of the following: (In thousands) At January 13, Cash $ 50,485 Contingent consideration (1) (5,000 ) Total net consideration transferred $ 45,485 (1) The contingent consideration entitles the Company to receive a rebate of the premium paid for account attrition that occurs during the eighteen-month period beginning on January 13, 2015, the closing date of the transaction. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date: (In thousands) At January 13, Cash $ 1,446,898 Intangible assets 43,000 Total identifiable assets acquired $ 1,489,898 Deposits $ 1,446,899 Contingent liability (1) 6,000 Total liabilities assumed $ 1,452,899 Net identifiable assets acquired $ 36,999 Goodwill 8,486 Net assets acquired $ 45,485 (1) The contingent liability represents an obligation that existed at the acquisition date. Accordingly, Webster assumed the contingent liability as part of the transaction and has accounted for it at fair value. The fair value of the acquired identifiable intangible assets includes a core deposit intangible and customer relationships. Refer to Note 7: Goodwill and Other Intangible Assets for additional information relating to the initial amounts of goodwill and other intangible assets recognized. Refer to Note 16: Fair Value Measurements for additional information on the valuation assumptions related to the contingent consideration and contingent liability recorded. Asset Purchase In December 2015, the Company negotiated an agreement with Citigroup Inc. to assume 17 banking center leases located in the greater Boston market and to purchase the related leasehold improvements. At December 31, 2015 , the Company had finalized, with the lessors, the terms of 16 of the 17 leases. The transaction which closed in 2016, did not include the purchase of loans or deposits, significantly increases Webster Bank's Community Banking presence in the Boston market. There was no impact to the Company's financial statements in 2015 ; however, refer to Note 20: Commitments and Contingencies for information regarding the impact relating to future minimum rental payments.

Investment Securities

Investment Securities	12 Months Ended
Investment Securities	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities A Summary of the amortized cost and fair value of investment securities is presented below: At December 31, 2015 2014 (In thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Available-for-sale: U.S. Treasury Bills $ 924 $ — $ — $ 924 $ 525 $ — $ — $ 525 Agency collateralized mortgage obligations (“agency CMO”) 546,168 5,532 (2,946 ) 548,754 543,417 8,636 (1,065 ) 550,988 Agency mortgage-backed securities (“agency MBS”) 1,075,941 6,459 (17,291 ) 1,065,109 1,030,724 10,462 (12,668 ) 1,028,518 Agency commercial mortgage-backed securities (“agency CMBS”) 215,670 639 (959 ) 215,350 80,400 — (134 ) 80,266 Non-agency commercial mortgage-backed securities ("non-agency CMBS") 574,686 7,485 (2,905 ) 579,266 534,631 18,885 (123 ) 553,393 Collateralized loan obligations ("CLO") 431,837 592 (3,270 ) 429,159 426,269 482 (1,017 ) 425,734 Single issuer trust preferred securities 42,168 — (4,998 ) 37,170 41,981 — (3,736 ) 38,245 Corporate debt securities 104,031 2,290 — 106,321 106,520 3,781 — 110,301 Equities - financial institutions 3,499 — (921 ) 2,578 3,500 2,403 — 5,903 Total available-for-sale $ 2,994,924 $ 22,997 $ (33,290 ) $ 2,984,631 $ 2,767,967 $ 44,649 $ (18,743 ) $ 2,793,873 Held-to-maturity: Agency CMO $ 407,494 $ 3,717 $ (2,058 ) $ 409,153 $ 442,129 $ 6,584 $ (739 ) $ 447,974 Agency MBS 2,030,176 38,813 (19,908 ) 2,049,081 2,134,319 57,196 (11,340 ) 2,180,175 Agency CMBS 686,086 4,253 (325 ) 690,014 578,687 1,597 (1,143 ) 579,141 Municipal bonds and notes 435,905 12,019 (417 ) 447,507 373,211 15,138 (55 ) 388,294 Non-agency CMBS 360,018 5,046 (2,704 ) 362,360 338,723 9,428 (1,015 ) 347,136 Private Label MBS 3,373 46 — 3,419 5,886 100 — 5,986 Total held-to-maturity $ 3,923,052 $ 63,894 $ (25,412 ) $ 3,961,534 $ 3,872,955 $ 90,043 $ (14,292 ) $ 3,948,706 Other-Than-Temporary Impairment The balance of OTTI, included in the amortized cost columns above, is related to certain CLO securities that are considered Covered Funds as defined by Section 619 of the Dodd-Frank Act, which continue to decline due to CLO deal refinancing and modifications. To the extent that changes occur in interest rates, credit movements, and other factors that impact fair value and expected recovery of amortized cost of its investment securities, the Company may be required to record a charge for OTTI in future periods. The following table presents the changes in OTTI: Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 3,696 $ 16,633 $ 10,460 Reduction for securities sold or called (518 ) (14,082 ) (1,104 ) Additions for OTTI not previously recognized 110 1,145 7,277 Ending balance $ 3,288 $ 3,696 $ 16,633 Fair Value and Unrealized Losses The following tables provide information on fair value and unrealized losses for the individual securities with an unrealized loss, aggregated by investment security type and length of time that the individual securities have been in a continuous unrealized loss position: At December 31, 2015 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses # of Holdings Fair Value Unrealized Losses Available-for-sale: Agency CMO $ 195,369 $ (2,195 ) $ 26,039 $ (751 ) 14 $ 221,408 $ (2,946 ) Agency MBS 481,839 (6,386 ) 351,911 (10,905 ) 84 833,750 (17,291 ) Agency CMBS 124,241 (959 ) — — 7 124,241 (959 ) Non-agency CMBS 276,330 (2,879 ) 19,382 (26 ) 29 295,712 (2,905 ) CLO 211,515 (2,709 ) 15,708 (561 ) 13 227,223 (3,270 ) Single issuer trust preferred securities 4,087 (128 ) 33,083 (4,870 ) 8 37,170 (4,998 ) Equities-financial institutions 2,578 (921 ) — — 1 2,578 (921 ) Total available-for-sale in an unrealized loss position $ 1,295,959 $ (16,177 ) $ 446,123 $ (17,113 ) 156 $ 1,742,082 $ (33,290 ) Held-to-maturity: Agency CMO $ 143,364 $ (1,304 ) $ 27,928 $ (754 ) 13 $ 171,292 $ (2,058 ) Agency MBS 551,918 (7,089 ) 470,828 (12,819 ) 87 1,022,746 (19,908 ) Agency CMBS 110,864 (325 ) — — 7 110,864 (325 ) Municipal bonds and notes 29,034 (130 ) 13,829 (287 ) 27 42,863 (417 ) Non-agency CMBS 142,382 (1,983 ) 30,129 (721 ) 18 172,511 (2,704 ) Total held-to-maturity in an unrealized loss position $ 977,562 $ (10,831 ) $ 542,714 $ (14,581 ) 152 $ 1,520,276 $ (25,412 ) At December 31, 2014 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses # of Holdings Fair Value Unrealized Losses Available-for-sale: Agency CMO $ 47,217 $ (240 ) $ 35,968 $ (825 ) 8 $ 83,185 $ (1,065 ) Agency MBS 3,691 (18 ) 641,355 (12,650 ) 64 645,046 (12,668 ) Agency CMBS 80,266 (134 ) — — 4 80,266 (134 ) Non-agency CMBS 24,932 (117 ) 9,396 (6 ) 4 34,328 (123 ) CLO 99,221 (1,017 ) — — 6 99,221 (1,017 ) Single issuer trust preferred securities 4,150 (36 ) 34,095 (3,700 ) 8 38,245 (3,736 ) Equities-financial institutions — — — — — — — Total available-for-sale in an unrealized loss position $ 259,477 $ (1,562 ) $ 720,814 $ (17,181 ) 94 $ 980,291 $ (18,743 ) Held-to-maturity: Agency CMO $ 52,172 $ (187 ) $ 24,942 $ (552 ) 6 $ 77,114 $ (739 ) Agency MBS 20,791 (86 ) 608,568 (11,254 ) 44 629,359 (11,340 ) Agency CMBS 324,394 (1,143 ) — — 17 324,394 (1,143 ) Municipal bonds and notes 5,341 (23 ) 3,074 (32 ) 15 8,415 (55 ) Non-agency CMBS 13,003 (30 ) 65,913 (985 ) 7 78,916 (1,015 ) Total held-to-maturity in an unrealized loss position $ 415,701 $ (1,469 ) $ 702,497 $ (12,823 ) 89 $ 1,118,198 $ (14,292 ) Impairment Analysis The following impairment analysis by investment security type, summarizes the basis for evaluating if investment securities within the Company’s available-for-sale and held-to-maturity portfolios are other-than-temporarily impaired. Unless otherwise noted for an investment security type, management does not intend to sell these investments and has determined, based upon available evidence, that it is more likely than not that the Company will not be required to sell these securities before the recovery of their amortized cost. As such, based on the following impairment analysis the Company does not consider these securities to be other-than-temporarily impaired at December 31, 2015 . Available-for-Sale Securities Agency CMO. There were unrealized losses of $2.9 million on the Company’s investment in agency CMO at December 31, 2015 , compared to $1.1 million at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . The contractual cash flows for these investments are performing as expected, and there has been no change in the underlying credit quality. Agency MBS. There were unrealized losses of $17.3 million on the Company’s investment in residential mortgage-backed securities issued by government agencies at December 31, 2015 , compared to $12.7 million at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or indirect. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Agency CMBS. There were unrealized losses of $1.0 million on the Company's investment in commercial mortgage-backed securities issued by government agencies at December 31, 2015 , compared to $0.1 million at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . Non-agency CMBS. There were unrealized losses of $2.9 million on the Company’s investment in non-agency commercial mortgage-backed securities at December 31, 2015 , compared to $0.1 million at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . Internal and external metrics are considered when evaluating potential OTTI. Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. Contractual cash flows for the bonds continue to perform as expected. CLO. There were unrealized losses of $3.3 million on the Company’s investments in CLO at December 31, 2015 compared to $1.0 million unrealized losses at December 31, 2014 . Unrealized losses increased due to higher market spreads for the asset class which resulted in lower security prices since December 31, 2014 . Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. Single issuer trust preferred securities. There were unrealized losses of $5.0 million on the Company's investment in single issuer trust preferred securities at December 31, 2015 , compared to $3.7 million at December 31, 2014 . Unrealized losses increased due to higher market spreads which resulted in lower security prices since December 31, 2014 . The single issuer portfolio consists of four investments issued by three large capitalization money center financial institutions, which continue to service the debt. The Company performs periodic credit reviews of the issuer to assess the likelihood for ultimate recovery of amortized cost. Equities - financial institutions. There were $0.9 million unrealized losses on the Company’s investment in equities - financial institutions at December 31, 2015 compared to no unrealized losses at December 31, 2014 . Held-to-Maturity Securities Agency CMO. There were unrealized losses of $2.1 million on the Company’s investment in agency CMO at December 31, 2015 , compared to $0.7 million at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . The contractual cash flows for these investments are performing as expected, and there has been no change in the underlying credit quality. Agency MBS. There were unrealized losses of $19.9 million on the Company’s investment in residential mortgage-backed securities issued by government agencies at December 31, 2015 , compared to $11.3 million at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or indirect. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Agency CMBS. There were unrealized losses of $0.3 million on the Company’s investment in commercial mortgage-backed securities issued by government agencies at December 31, 2015 , compared to $1.1 million at December 31, 2014 . Unrealized losses decreased due to security seasoning which resulted in higher security prices since December 31, 2014 . Municipal bonds and notes. There were unrealized losses of $417 thousand on the Company’s investment in municipal bonds and notes at December 31, 2015 , compared to $55 thousand at December 31, 2014 , as market rates were essentially unchanged. The Company performs periodic credit reviews of the issuers and the securities are currently performing as expected. Non-agency CMBS. There were unrealized losses of $2.7 million on the Company’s investment in non-agency commercial mortgage-backed securities at December 31, 2015 , compared to $1.0 million unrealized losses at December 31, 2014 . Unrealized losses increased due to higher market rates which resulted in lower security prices since December 31, 2014 . Internal and external metrics are considered when evaluating potential OTTI. Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. Sales of Available-for Sale Securities The following table provides information on sales of available-for-sale securities: Years ended December 31, (In thousands) 2015 2014 2013 Proceeds from sales $ 95,101 $ 126,580 $ 57,804 Gross realized gains on sales $ 1,029 $ 7,268 $ 2,847 Gross realized losses on sales 420 1,769 2,135 Gain on sale of investment securities, net $ 609 $ 5,499 $ 712 Contractual Maturities The amortized cost and fair value of debt securities by contractual maturity are set forth below: At December 31, 2015 Available-for-Sale Held-to-Maturity (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 35,941 $ 35,660 $ 320 $ 323 Due after one year through five years 99,028 101,313 33,940 34,880 Due after five through ten years 435,444 433,733 48,818 50,534 Due after ten years 2,421,012 2,411,347 3,839,974 3,875,797 Total debt securities $ 2,991,425 $ 2,982,053 $ 3,923,052 $ 3,961,534 For the maturity schedule above, mortgage-backed securities and collateralized loan obligations, which are not due at a single maturity date, have been categorized based on the maturity date of the underlying collateral. Actual principal cash flows may differ from this maturity date presentation because borrowers have the right to prepay obligations with or without prepayment penalties. At December 31, 2015 , the Company had a carrying value of $961.6 million in callable securities in its CMBS, CLO, and municipal bond portfolios. The Company considers these factors in the evaluation of its interest rate risk profile. These maturities do not reflect actual duration which is impacted by prepayment. Securities with a carrying value totaling $2.6 billion at December 31, 2015 and $2.9 billion at December 31, 2014 were pledged to secure public funds, trust deposits, repurchase agreements, and for other purposes, as required or permitted by law.

Loans and Leases

Loans and Leases	12 Months Ended
Loans and Leases	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	Loans and Leases The following table summarizes loans and leases: At December 31, (In thousands) 2015 2014 Residential $ 4,061,001 $ 3,509,175 Consumer 2,702,560 2,549,401 Commercial 4,315,999 3,749,270 Commercial Real Estate 3,991,649 3,554,428 Equipment Financing 600,526 537,751 Loans and leases (1)(2) $ 15,671,735 $ 13,900,025 (1) Loan and lease balances include net deferred fees and unamortized premiums of $18.0 million and $10.6 million at December 31, 2015 and December 31, 2014 , respectively. (2) Accrued interest of $43.1 million and $38.4 million at December 31, 2015 and December 31, 2014 , respectively, are not included in the loan and lease balances. At December 31, 2015 , the Company had pledged $6.1 billion of eligible loans as collateral to support available borrowing capacity at the Federal Home Loan Bank of Boston and the Federal Reserve Bank of Boston. Loans and Leases Portfolio Aging The following tables summarize the aging of loans and leases: At December 31, 2015 (In thousands) 30-59 Days Past Due and Accruing 60-89 Days 90 or More Days Past Due and Accruing Non-accrual Total Past Due and Non-accrual (1) Current Total Loans and Leases Residential $ 10,365 $ 4,703 $ 2,029 $ 54,201 $ 71,298 $ 3,989,703 $ 4,061,001 Consumer: Home equity 9,061 4,242 — 37,337 50,640 2,402,758 2,453,398 Other consumer 1,390 615 — 560 2,565 246,597 249,162 Commercial: Commercial non-mortgage 768 3,288 22 27,037 31,115 3,531,669 3,562,784 Asset-based — — — — — 753,215 753,215 Commercial real estate: Commercial real estate 1,624 625 — 16,767 19,016 3,673,408 3,692,424 Commercial construction — — — 3,461 3,461 295,764 299,225 Equipment financing 543 59 — 706 1,308 599,218 600,526 Total $ 23,751 $ 13,532 $ 2,051 $ 140,069 $ 179,403 $ 15,492,332 $ 15,671,735 At December 31, 2014 (In thousands) 30-59 Days Past Due and Accruing 60-89 Days 90 or More Days Past Due and Accruing Non-accrual Total Past Due and Non-accrual (1) Current Total Loans and Leases Residential (2) $ 11,410 $ 5,840 $ 2,039 $ 64,117 $ 83,406 $ 3,425,769 $ 3,509,175 Consumer: Home equity 11,393 5,076 — 40,026 56,495 2,417,275 2,473,770 Other consumer 704 410 — 281 $ 1,395 74,236 75,631 Commercial: Commercial non-mortgage 1,948 153 48 6,449 8,598 3,079,342 3,087,940 Asset-based — — — — — 661,330 661,330 Commercial real estate: Commercial real estate 2,325 392 — 15,038 17,755 3,302,652 3,320,407 Commercial construction — — — 3,659 3,659 230,362 234,021 Equipment financing 551 150 — 578 1,279 536,472 537,751 Total $ 28,331 $ 12,021 $ 2,087 $ 130,148 $ 172,587 $ 13,727,438 $ 13,900,025 (1) Loans and leases 30 days or more days past due and accruing exclude $0.6 million and $0.5 million of accrued interest receivable at December 31, 2015 and December 31, 2014 , respectively. (2) U.S. Government guaranteed loans of approximately $2.0 million were reclassified from non-accrual to over 90 days past due and accruing reflective of a policy change effective in the first quarter of 2015 . Interest on non-accrual loans and leases that would have been recorded as additional interest income for the years ended December 31, 2015 , 2014 , and 2013 , had the loans and leases been current in accordance with their original terms, totaled $8.2 million , $9.3 million , and $11.4 million , respectively. Allowance for Loan and Lease Losses The following tables summarize the activity in, as well as the loan and lease balances that were evaluated for, the ALLL: At or for the Year ended December 31, 2015 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance at January 1, 2015 $ 25,452 $ 43,518 $ 52,114 $ 32,102 $ 6,078 $ 159,264 Provision (benefit) charged to expense 6,057 11,847 23,356 9,718 (1,678 ) 49,300 Losses charged off (6,508 ) (17,679 ) (11,522 ) (7,578 ) (273 ) (43,560 ) Recoveries 875 4,366 2,738 647 1,360 9,986 Balance at December 31, 2015 $ 25,876 $ 42,052 $ 66,686 $ 34,889 $ 5,487 $ 174,990 Individually evaluated for impairment $ 10,364 $ 3,477 $ 5,197 $ 3,163 $ 3 $ 22,204 Collectively evaluated for impairment $ 15,512 $ 38,575 $ 61,489 $ 31,726 $ 5,484 $ 152,786 Loan and lease balances: Individually evaluated for impairment $ 134,448 $ 48,425 $ 56,581 $ 39,295 $ 422 $ 279,171 Collectively evaluated for impairment 3,926,553 2,654,135 4,259,418 3,952,354 600,104 15,392,564 Loans and leases $ 4,061,001 $ 2,702,560 $ 4,315,999 $ 3,991,649 $ 600,526 $ 15,671,735 At or for the Year ended December 31, 2014 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance at January 1, 2014 $ 23,027 $ 41,951 $ 51,001 $ 32,408 $ 4,186 $ 152,573 Provision (benefit) charged to expense 7,315 17,224 10,412 2,046 253 37,250 Losses charged off (6,214 ) (20,712 ) (13,668 ) (3,237 ) (595 ) (44,426 ) Recoveries 1,324 5,055 4,369 885 2,234 13,867 Balance at December 31, 2014 $ 25,452 $ 43,518 $ 52,114 $ 32,102 $ 6,078 $ 159,264 Individually evaluated for impairment $ 12,094 $ 4,237 $ 2,710 $ 6,232 $ 28 $ 25,301 Collectively evaluated for impairment $ 13,358 $ 39,281 $ 49,404 $ 25,870 $ 6,050 $ 133,963 Loan and lease balances: Individually evaluated for impairment $ 141,982 $ 50,249 $ 36,176 $ 101,817 $ 632 $ 330,856 Collectively evaluated for impairment 3,367,193 2,499,152 3,713,094 3,452,611 537,119 13,569,169 Loans and leases $ 3,509,175 $ 2,549,401 $ 3,749,270 $ 3,554,428 $ 537,751 $ 13,900,025 At or for the Year ended December 31, 2013 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance at January 1, 2013 $ 32,030 $ 56,995 $ 50,562 $ 33,210 $ 4,332 $ 177,129 Provision (benefit) charged to expense 1,187 7,808 14,442 12,975 (2,912 ) 33,500 Losses charged off (11,592 ) (29,037 ) (19,126 ) (15,425 ) (279 ) (75,459 ) Recoveries 1,402 6,185 5,123 1,648 3,045 17,403 Balance at December 31, 2013 $ 23,027 $ 41,951 $ 51,001 $ 32,408 $ 4,186 $ 152,573 Individually evaluated for impairment $ 10,535 $ 4,595 $ 1,878 $ 3,445 $ — $ 20,453 Collectively evaluated for impairment $ 12,492 $ 37,356 $ 49,123 $ 28,963 $ 4,186 $ 132,120 Loan and lease balances: Individually evaluated for impairment $ 142,413 $ 52,092 $ 52,018 $ 104,808 $ 210 $ 351,541 Collectively evaluated for impairment 3,219,012 2,484,596 3,230,833 2,953,554 460,240 12,348,235 Loans and leases $ 3,361,425 $ 2,536,688 $ 3,282,851 $ 3,058,362 $ 460,450 $ 12,699,776 Impaired Loans and Leases The following tables summarize impaired loans and leases: At December 31, 2015 (In thousands) Unpaid Principal Balance Total Recorded Investment (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential: 1-4 family $ 148,144 $ 134,448 $ 23,024 $ 111,424 $ 10,364 Consumer: Home equity 56,680 48,425 25,130 23,295 3,477 Commercial: Commercial non-mortgage 67,116 56,581 31,600 24,981 5,197 Commercial real estate: Commercial real estate 36,980 33,333 9,204 24,129 3,160 Commercial construction 7,010 5,962 5,939 23 3 Equipment financing 612 422 328 94 3 Total $ 316,542 $ 279,171 $ 95,225 $ 183,946 $ 22,204 At December 31, 2014 (In thousands) Unpaid Principal Balance Total Recorded Investment (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential: 1-4 family $ 157,152 $ 141,982 $ 24,335 $ 117,647 $ 12,094 Consumer: Home equity 60,424 50,249 26,432 23,817 4,237 Commercial: Commercial non-mortgage 41,019 36,176 15,998 20,178 2,710 Commercial real estate: Commercial real estate 99,687 95,656 40,306 55,350 6,222 Commercial construction 7,218 6,161 5,940 221 10 Equipment financing 629 632 — 632 28 Total $ 366,129 $ 330,856 $ 113,011 $ 217,845 $ 25,301 (1) Total recorded investment of impaired loans and leases exclude $1.7 million and $1.4 million of accrued interest receivable at December 31, 2015 and December 31, 2014 , respectively. The following table summarizes the average recorded investment and interest income recognized for impaired loans and leases: Years ended December 31, 2015 2014 2013 (In thousands) Average Recorded Investment Accrued Interest Income Cash Basis Interest Income Average Recorded Investment Accrued Interest Income Cash Basis Interest Income Average Accrued Cash Basis Interest Income Residential $ 138,215 $ 4,473 $ 1,139 $ 142,198 $ 4,644 $ 1,221 $ 144,325 $ 4,119 $ 1,954 Consumer 49,337 1,451 1,099 51,171 1,484 1,203 53,318 1,003 1,724 Commercial 46,379 1,319 — 44,097 2,326 — 60,558 2,889 — Commercial real estate: Commercial real estate 64,495 1,165 — 93,209 3,429 — 105,676 4,476 — Commercial construction 6,062 133 — 8,381 269 — 15,254 620 — Equipment financing 527 16 — 421 28 — 1,284 22 — Total $ 305,015 $ 8,557 $ 2,238 $ 339,477 $ 12,180 $ 2,424 $ 380,415 $ 13,129 $ 3,678 Credit Quality Indicators. To measure credit risk for the commercial, commercial real estate, and equipment financing portfolios, the Company employs a dual grade credit risk grading system for estimating the probability of borrower default and the loss given default. The credit risk grade system assigns a rating to each borrower and to the facility, which together form a Composite Credit Risk Profile (“CCRP”). The credit risk grade system categorizes borrowers by common financial characteristics that measure the credit strength of borrowers and facilities by common structural characteristics. The CCRP has 10 grades, with each grade corresponding to a progressively greater risk of default. Grades 1 through 6 are considered pass ratings, and 7 through 10 are criticized as defined by the regulatory agencies. Risk ratings, assigned to differentiate risk within the portfolio, are reviewed on an ongoing basis and revised to reflect changes in the borrowers’ current financial positions and outlooks, risk profiles, and the related collateral and structural positions. Loan officers review updated financial information on at least an annual basis for all pass rated loans to assess the accuracy of the risk grade. Criticized loans undergo more frequent reviews and enhanced monitoring. A “Special Mention” (7) credit has the potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the asset. “Substandard” (8) assets have a well defined weakness that jeopardizes the full repayment of the debt. An asset rated “Doubtful” (9) has all of the same weaknesses as a substandard credit with the added characteristic that the weakness makes collection or liquidation in full, given current facts, conditions, and values, improbable. Assets classified as “Loss” (10) in accordance with regulatory guidelines are considered uncollectible and charged off. The following table summarize commercial, commercial real estate and equipment financing loans and leases segregated by risk rating exposure: Commercial Commercial Real Estate Equipment Financing (In thousands) At December 31, At December 31, At December 31, At December 31, At December 31, At December 31, (1) - (6) Pass $ 4,023,255 $ 3,545,218 $ 3,857,019 $ 3,408,128 $ 586,445 $ 516,116 (7) Special Mention 70,904 88,777 55,030 33,453 1,628 4,364 (8) Substandard 220,389 115,106 79,289 112,354 12,453 17,271 (9) Doubtful 1,451 169 311 493 — — Total $ 4,315,999 $ 3,749,270 $ 3,991,649 $ 3,554,428 $ 600,526 $ 537,751 For residential and consumer loans, the Company considers factors such as past due status, updated FICO scores, employment status, home prices, loan to value, geography, loans discharged in bankruptcy, and the status of first lien position loans on second lien position loans as credit quality indicators. On an ongoing basis for portfolio monitoring purposes, the Company estimates the current value of property secured as collateral for both home equity and residential first mortgage lending products. The estimate is based on home price indices compiled by the S&P/Case-Shiller Home Price Indices. The Case-Shiller data indicates trends for Metropolitan Statistical Areas. The trend data is applied to the loan portfolios taking into account the age of the most recent valuation and geographic area. Troubled Debt Restructurings The following table summarizes information for TDRs: At December 31, (Dollars in thousands) 2015 2014 Accrual status $ 171,784 $ 241,855 Non-accrual status 100,906 76,939 Total recorded investment of TDRs (1) $ 272,690 $ 318,794 Accruing TDRs performing under modified terms more than one year 55.0 % 67.5 % Specific reserves for TDRs included in the balance of allowance for loan and lease losses $ 21,405 $ 23,785 Additional funds committed to borrowers in TDR status 1,133 552 (1) Total recorded investment of TDRs exclude $1.1 million and $1.4 million at December 31, 2015 and December 31, 2014 , respectively, of accrued interest receivable. For years ended December 31, 2015 , 2014 and 2013 , Webster charged off $11.8 million , $13.5 million , and $24.4 million , respectively, for the portion of TDRs deemed to be uncollectible. TDRs may be modified by means of extended maturity, below market adjusted interest rates, a combination of rate and maturity, or other means, including covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, or other concessions. The following table provides information on the type of concession for loans and leases modified as TDRs: Years ended December 31, 2015 2014 2013 Number of Loans and Leases Post- Modification Recorded Investment (1) Number of Loans and Leases Post- Modification Recorded Investment (1) Number of Loans and Leases Post- Modification Recorded Investment (1) (Dollars in thousands) Residential: Extended Maturity 27 $ 4,909 27 $ 3,547 27 $ 5,219 Adjusted Interest rates 3 573 3 448 8 2,759 Combination Rate and Maturity 26 5,315 22 4,220 45 8,264 Other (2) 30 4,366 55 11,791 44 9,497 Consumer: Extended Maturity 12 1,012 19 944 24 1,159 Adjusted Interest rates — — 1 51 4 154 Combination Rate and Maturity 12 945 6 411 14 1,504 Other (2) 68 3,646 90 4,931 100 4,247 Commercial: Extended Maturity 3 254 7 422 3 7,525 Adjusted Interest rates 1 24 1 25 — — Combination Rate and Maturity 7 5,361 22 1,212 22 1,083 Other (2) 20 22,048 6 7,431 4 4,603 Commercial real estate: Extended Maturity 1 315 — — 3 226 Combination Rate and Maturity 1 42 2 11,106 6 15,520 Other (2) 1 405 — — 1 68 Equipment Financing Extended Maturity — — 1 492 — — Total 212 $ 49,215 262 $ 47,031 305 $ 61,828 (1) Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant. (2) Other includes covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, and/or other concessions. The following table provides information on loans and leases modified as TDRs within the previous 12 months and for which there was a payment default during the periods presented: Years ended December 31, 2015 2014 2013 (Dollars in thousands) Number of Loans and Leases Recorded Investment Number of Loans and Leases Recorded Investment Number of Loans and Leases Recorded Investment Residential 1 $ 55 7 $ 1,494 9 $ 1,201 Consumer 1 3 2 24 4 339 Commercial — — — — 1 47 Commercial real estate — — — — — — Total 2 $ 58 9 $ 1,518 14 $ 1,587 The recorded investment of TDRs in commercial, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: At December 31, (In thousands) 2015 2014 (1) - (6) Pass $ 12,970 $ 40,734 (7) Special Mention 2,999 8,275 (8) Substandard 72,132 77,211 (9) Doubtful 1,717 343 Total $ 89,818 $ 126,563

Transfers of Financial Assets a

Transfers of Financial Assets and Mortgage Servicing Assets	12 Months Ended
Transfers of Financial Assets and Mortgage Servicing Assets	Dec. 31, 2015
Transfers and Servicing [Abstract]
Transfers of Financial Assets and Mortgage Servicing Assets	Transfers of Financial Assets and Mortgage Servicing Assets Transfers of Financial Assets The Company sells financial assets in the normal course of business, primarily residential mortgage loans sold to government-sponsored enterprises through established programs and securities. The gain or loss on residential mortgage loans sold is included as mortgage banking activities in the accompanying Consolidated Statements of Income. The Company may be required to repurchase a loan in the event of certain breaches of the representations and warranties, or in the event of default of the borrower within 90 days of sale, as provided for in the sale agreements. A reserve for loan repurchases provides for estimated losses pertaining to the potential repurchase of loans associated with the Company's mortgage banking activities. The reserve reflects management’s monthly evaluation of the identity of counterparty, the vintage of the loans sold, the amount of open repurchase requests, specific loss estimates for each open request, the current level of loan losses in similar vintages held in the residential loan portfolio, and estimated recoveries on the underlying collateral. The reserve also reflects management’s expectation of losses from repurchase requests for which the Company has not yet been notified, as the performance of loans sold and the quality of the servicing provided by the acquirer may also impact the reserve. The provision recorded at the time of the loan sale is netted from the gain or loss recorded in mortgage banking activities, while any incremental provision, post loan sale, is recorded in other non-interest expense in the accompanying Consolidated Statements of Income. The following table provides a summary of activity in the reserve for loan repurchases: Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 1,059 $ 2,254 $ 2,617 Provision (benefit) 133 (493 ) 1,209 Loss on repurchased loans and settlements — (702 ) (1,572 ) Ending balance $ 1,192 $ 1,059 $ 2,254 The following table provides information for mortgage banking activities: Years ended December 31, (In thousands) 2015 (1) 2014 2013 Residential mortgage loans: Proceeds from the sale of loans held for sale $ 452,590 $ 287,132 $ 773,887 Net gain on sale 7,795 4,070 16,359 Loans sold with servicing rights retained 416,277 264,292 690,300 Commercial loans: Proceeds from the sale of loans held for sale 729 — 12,771 Net gain (loss) on sale 145 — (229 ) (1) Additionally, certain consumer loans not originated for sale were sold at cost for cash proceeds of $32.9 million . Mortgage Servicing Assets The Company has retained servicing rights on residential mortgage loans totaling $2.5 billion and $2.4 billion at December 31, 2015 and 2014 , respectively. The resulting mortgage servicing assets of $20.7 million and $19.4 million at December 31, 2015 and 2014 , respectively, are carried at the lower of cost or fair value and are included as a component of other assets in the accompanying Consolidated Balance Sheets. Changes in fair value are included as a component of other non-interest income in the accompanying Consolidated Statements of Income. The following table presents the changes in fair value for those mortgage servicing assets: Years ended December 31, (In thousands) 2015 2014 Beginning balance $ 28,690 $ 29,150 Originations of servicing assets 8,027 4,581 Changes in fair value: Due to payoffs/paydowns (2,741 ) (2,577 ) Due to market changes (408 ) (2,464 ) Ending balance $ 33,568 $ 28,690 See Note 16: Fair Value Measurements for a further discussion on the fair value of mortgage servicing assets. Loan servicing fees, net of mortgage servicing rights amortization, were $1.5 million , $1.5 million , and $3.0 million , for the years ended December 31, 2015 , 2014 , and 2013 , respectively, and are included as a component of loan related fees in the accompanying Consolidated Statements of Income.

Premises and Equipment

Premises and Equipment	12 Months Ended
Premises and Equipment	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment A summary of premises and equipment follows: At December 31, (In thousands) 2015 2014 Land $ 12,899 $ 12,987 Buildings and improvements 94,686 95,843 Leasehold improvements 79,917 78,029 Fixtures and equipment 73,686 73,180 Data processing and software 195,308 175,887 Total premises and equipment 456,496 435,926 Less: Accumulated depreciation and amortization (327,070 ) (313,993 ) Premises and equipment, net $ 129,426 $ 121,933 Depreciation and amortization of premises and equipment was $28.4 million , $27.9 million , and $31.1 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. The following table provides a summary of activity for assets held for disposition: Years ended December 31, (In thousands) 2015 2014 Beginning balance $ 759 $ 1,567 Additions 144 1,061 Write-downs — (432 ) Sales (266 ) (1,437 ) Ending balance $ 637 $ 759

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
Goodwill and Other Intangible Assets	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table presents the carrying value for goodwill allocated by reportable segment: (In thousands) Community Banking HSA Bank Total Goodwill Balance at January 1, 2015 $ 516,560 $ 13,327 $ 529,887 Goodwill acquired — 8,486 8,486 Balance at December 31, 2015 $ 516,560 $ 21,813 $ 538,373 The goodwill arising from the HSA Bank acquisition is attributable primarily to expected synergies of the business combination. The full amount of goodwill recorded in the current period is expected to be deductible for income tax purposes. The gross carrying amount and accumulated amortization of core deposit intangibles ("CDI") and customer relationships included in the reportable segments are as follows: At December 31, 2015 2014 (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Community Banking, CDI $ 49,420 $ (48,277 ) $ 1,143 $ 49,420 $ (46,754 ) $ 2,666 HSA Bank: CDI 22,000 (3,269 ) 18,731 — — — Customer relationships 21,000 (1,548 ) 19,452 — — — Total HSA Bank 43,000 (4,817 ) 38,183 — — — Total other intangible assets $ 92,420 $ (53,094 ) $ 39,326 $ 49,420 $ (46,754 ) $ 2,666 The intangibles arising from the HSA Bank acquisition were recorded at fair value, including CDI assets with an estimated useful life of 9 years and customer relationship intangible assets with an estimated useful life of 13 years . As of December 31, 2015 , the remaining estimated aggregate future amortization expense for intangible assets is as follows: (In thousands) 2016 $ 5,652 2017 4,062 2018 3,847 2019 3,847 2020 3,847 Thereafter 18,071

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense reflects the following expense (benefit) components: Years ended December 31, (In thousands) 2015 2014 2013 Current: Federal $ 98,442 $ 90,542 $ 62,042 State and local 11,047 6,585 3,572 Total current 109,489 97,127 65,614 Deferred: Federal (7,279 ) (3,784 ) 10,760 State and local (8,234 ) (1,370 ) 739 Total deferred (15,513 ) (5,154 ) 11,499 Total federal 91,163 86,758 72,802 Total state and local 2,813 5,215 4,311 Income tax expense $ 93,976 $ 91,973 $ 77,113 The Company's income tax expense reflects the benefits of an operating loss carryforward of $3.0 million in 2015 , and net tax credits of $2.1 million , $0.3 million , and $0.6 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. The following table reflects a reconciliation of reported income tax expense to the amount that would result from applying the federal statutory rate of 35.0% : Years ended December 31, 2015 2014 2013 (Dollars in thousands) Amount Percent Amount Percent Amount Percent Income tax expense at federal statutory rate $ 105,111 35.0 % $ 102,095 35.0 % $ 89,799 35.0 % Reconciliation to reported income tax expense: State and local income taxes, net of federal benefit 7,613 2.5 3,390 1.2 2,802 1.1 Tax-exempt interest income, net (7,117 ) (2.4 ) (7,335 ) (2.5 ) (8,517 ) (3.3 ) Decrease in valuation allowance applicable to net state deferred tax assets, net of federal effects (5,785 ) (1.9 ) — — — — Increase in cash surrender value of life insurance (4,557 ) (1.5 ) (4,612 ) (1.6 ) (4,819 ) (1.9 ) Other, net (1,289 ) (0.4 ) (1,565 ) (0.6 ) (2,152 ) (0.8 ) Income tax expense and effective tax rate $ 93,976 31.3 % $ 91,973 31.5 % $ 77,113 30.1 % Refundable income taxes totaling $56.6 million and $56.7 million at December 31, 2015 and 2014 , respectively, are reflected in accrued interest receivable and other assets in the accompanying Consolidated Balance Sheets, and are largely attributable to federal carryback claims applicable to 2008 and 2009 losses. During 2015, the Internal Revenue Service (“IRS”) completed its examination of Webster and submitted its report to the U.S. congressional Joint Committee on Taxation (“JCT”). The JCT completed its review in late 2015, taking no exception to the conclusions reached by the IRS. The refunds, which include estimated non-contingent accrued interest income of $2.8 million and $1.0 million at December 31, 2015 and 2014 , respectively, are anticipated to be received by the Company in early 2016. The following table reflects the significant components of the deferred tax asset, net (“DTA”): At December 31, (In thousands) 2015 2014 Deferred tax assets: Allowance for loan and lease losses $ 70,937 $ 65,288 Net operating loss and credit carry forwards 62,403 64,561 Compensation and employee benefit plans 52,422 47,748 Net losses on derivative instruments 11,734 12,637 Net unrealized loss on securities available for sale 4,138 — Other 27,862 27,300 Gross deferred tax assets 229,496 217,534 Valuation allowance (74,918 ) (80,722 ) Total deferred tax assets, net of valuation allowance $ 154,578 $ 136,812 Deferred tax liabilities: Net unrealized gain on securities available for sale $ — $ 10,288 Equipment-financing leases 23,934 21,930 Deferred income on repurchase of debt 6,376 8,502 Intangible assets 9,165 9,242 Mortgage servicing assets 7,127 7,230 Other 6,398 5,747 Gross deferred tax liabilities 53,000 62,939 Deferred tax asset, net $ 101,578 $ 73,873 The Company's DTA increased by $27.7 million during 2015 , reflecting primarily the $15.5 million deferred tax benefit and a $14.3 million benefit allocated directly to shareholders equity. The $15.5 million deferred benefit included a $5.8 million reduction in the beginning-of-year valuation allowance applicable to state and local deferred tax assets. The $14.3 million benefit allocated to shareholders' equity included $13.3 million related to a reduction in valuations of available-for-sale securities during the year. The $74.9 million valuation allowance at December 31, 2015 consisted of $69.6 million attributable to net state deferred tax assets and $5.3 million to capital losses, deductible only to the extent of capital gains for federal tax purposes. The decrease in the valuation allowance includes: (i) a $1.0 million decrease applicable to capital losses; (ii) the $5.8 million reduction in the beginning-of-year valuation allowance noted above, applicable to a change in the Company’s estimated realizability of state deferred tax assets for which a full valuation allowance had been established at the beginning of the year, including $4.4 million applicable to future years; and (iii) a $1.0 million increase applicable to changes in net state deferred tax assets for which a full valuation allowance had been established at both the beginning and end of the year. Management believes it is more likely than not that Webster will realize its total deferred tax assets, net of the valuation allowance. Significant positive evidence exists in support of management’s conclusion regarding the realization of Webster's DTA, including: book-taxable income levels in recent years and projected future years; recoverable taxes paid in 2015 and 2014 ; and projected future reversals of existing taxable temporary differences. There can, however, be no assurance that any specific level of future income will be generated or that the Company’s DTA will ultimately be realized. Capital losses approximating $15.4 million at December 31, 2015 are scheduled to expire in varying amounts during tax years 2017 and 2018. A full valuation allowance has been established for the tax effect of these losses, as noted above. State net operating losses approximating $1.2 billion at December 31, 2015 are scheduled to expire in varying amounts during tax years 2021 through 2032, and credits, totaling $2.2 million at December 31, 2015 , have a five-year carryover period, with excess credits subject to expiration annually. A valuation allowance of $58.0 million , net, has been established for those state net operating losses and credits not expected to be utilized, and is included in the valuation allowance attributable to net state deferred tax assets as noted above. A deferred tax liability of $21.4 million has not been recognized for certain thrift bad-debt reserves, established before 1988, that would become taxable upon the occurrence of certain events: distributions by Webster Bank in excess of certain earnings and profits; the redemption of Webster Bank’s stock; or a liquidation. Webster does not expect any of those events to occur. At December 31, 2015 and 2014 the cumulative taxable temporary differences applicable to those reserves approximated $58.0 million . The following table reflects a reconciliation of the beginning and ending balances for unrecognized tax benefits (“UTBs”): Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 4,593 $ 3,109 $ 3,119 Additions as a result of tax positions taken during the current year 865 956 528 Additions as a result of tax positions taken during prior years 1,254 1,031 442 Reductions as a result of tax positions taken during prior years (247 ) — (460 ) Reductions relating to settlements with taxing authorities (992 ) — — Reductions as a result of lapse of statute of limitations (379 ) (503 ) (520 ) Ending balance $ 5,094 $ 4,593 $ 3,109 At December 31, 2015 , 2014 , and 2013 , there are $3.3 million , $3.0 million , and $2.0 million , respectively, of UTBs that, if recognized, would affect the effective tax rate. Webster recognizes interest and penalties related to UTBs, where applicable, in income tax expense. During the years ended December 31, 2015 , 2014 , and 2013 , Webster recognized interest and penalties totaling $1.1 million , $0.5 million , and $0.3 million , respectively. At December 31, 2015 and 2014 , the Company had accrued interest and penalties related to UTBs of $2.5 million and $1.6 million , respectively. Webster has determined it is reasonably possible that its total UTBs could decrease by an amount in the range of $2.2 million to $3.4 million by the end of 2016, primarily as a result of potential settlements with state and local taxing authorities concerning tax-base and apportionment determinations. Webster is currently under, or subject to, examination by various taxing authorities. Federal tax returns for all years subsequent to 2009 are either under, or remain open to, examination. For Webster’s principal state tax jurisdictions, returns for years subsequent to the following are either under, or remain open to, examination: Massachusetts and Rhode Island 2010; Connecticut 2011; and New York 2012.

Deposits

Deposits	12 Months Ended
Deposits	Dec. 31, 2015
Banking and Thrift [Abstract]
Deposits	Deposits A summary of deposits by type follows: At December 31, (In thousands) 2015 2014 Non-interest-bearing: Demand $ 3,713,063 $ 3,598,872 Interest-bearing: Checking 2,369,971 2,155,047 Health savings accounts 3,802,313 1,824,799 Money market 1,933,460 1,908,522 Savings 4,047,817 3,892,778 Time deposits 2,086,154 2,271,587 Total interest-bearing 14,239,715 12,052,733 Total deposits $ 17,952,778 $ 15,651,605 Time deposits and interest-bearing checking, included in above balances, obtained through brokers $ 910,304 $ 651,725 Time deposits, included in above balance, that meet or exceed the Federal Deposit Insurance Corporation limit 542,206 533,980 Demand deposit overdrafts reclassified as loan balances 1,356 1,655 The scheduled maturities of time deposits are as follows: (In thousands) At December 31, 2015 2016 $ 1,034,275 2017 253,782 2018 240,921 2019 392,926 2020 164,154 Thereafter 96 Total time deposits $ 2,086,154

Borrowings

Borrowings	12 Months Ended
Borrowings	Dec. 31, 2015
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table summarizes securities sold under agreements to repurchase and other borrowings: At December 31, (In thousands) 2015 2014 Securities sold under agreements to repurchase: Original maturity of one year or less $ 334,400 $ 409,756 Original maturity of greater than one year, non-callable 500,000 550,000 Total securities sold under agreements to repurchase 834,400 959,756 Fed funds purchased 317,000 291,000 Securities sold under agreements to repurchase and other borrowings $ 1,151,400 $ 1,250,756 Repurchase agreements are used as a source of borrowed funds and are collateralized by U.S. Government agency mortgage-backed securities which are delivered to broker/dealers. Repurchase agreements with counterparties are limited to primary dealers in government securities and commercial/municipal customers through Webster’s Treasury Sales desk. Dealer counterparties have the right to pledge, transfer, or hypothecate purchased securities during the term of the transaction. The Company has right of offset with respect to all repurchase agreement assets and liabilities. Total securities sold under agreements to repurchase represents the gross amount for these transactions, as only liabilities are outstanding for the periods presented. The following table provides information for Federal Home Loan Bank advances maturing: At December 31, 2015 2014 (Dollars in thousands) Total Outstanding Weighted- Average Contractual Coupon Rate Total Outstanding Weighted- Average Contractual Coupon Rate Within 1 year $ 2,025,934 0.55 % $ 2,275,000 0.23 % After 1 but within 2 years 500 5.66 145,934 1.80 After 2 but within 3 years 200,000 1.36 500 5.66 After 3 but within 4 years 103,026 1.54 200,000 1.36 After 4 but within 5 years 175,000 1.77 78,026 1.95 After 5 years 159,655 1.60 159,934 1.27 2,664,115 0.79 % 2,859,394 0.50 % Unamortized premiums 24 37 Federal Home Loan Bank advances $ 2,664,139 $ 2,859,431 At December 31, 2015 , Webster Bank had pledged loans and securities with an aggregate carrying value of $5.7 billion as collateral for borrowings, with a remaining borrowing capacity from the FHLB of approximately $1.2 billion . At December 31, 2014 , Webster Bank had pledged loans and securities with an aggregate carrying value of $5.2 billion as collateral for borrowings, with a remaining borrowing capacity from the FHLB of approximately $0.7 billion . In addition, at December 31, 2015 and 2014 Webster Bank had an unused line of credit of approximately $5.0 million . At December 31, 2015 and 2014 , Webster Bank was in compliance with FHLB collateral requirements. The following table summarizes long-term debt: At December 31, (Dollars in thousands) 2015 2014 4.375% Senior fixed-rate notes due February 15, 2024 $ 150,000 $ 150,000 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (1) 77,320 77,320 Total notes and subordinated debt 227,320 227,320 Unamortized discount on senior fixed-rate notes (964 ) (1,083 ) Long-term debt $ 226,356 $ 226,237 (1) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95% , was 3.48% at December 31, 2015 and 3.19% at December 31, 2014 .

Shareholders' Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2015
Equity [Abstract]
Shareholders' Equity	Shareholders' Equity Share activity during the year ended December 31, 2015 is as follows: Preferred Stock Series A Preferred Stock Series E Common Stock Issued Treasury Stock Held Common Stock Outstanding Balance at January 1, 2015 28,939 5,060 93,623,090 3,241,555 90,381,535 Restricted share activity — — — (377,598 ) 377,598 Stock options exercised — — — (58,473 ) 58,473 Common stock repurchased — — — 350,000 (350,000 ) Warrant exercise — — 28,511 — 28,511 Series A conversion (28,939 ) — — (1,065,075 ) 1,065,075 Balance at December 31, 2015 — 5,060 93,651,601 2,090,409 91,561,192 Common Stock On December 6, 2012, Webster announced that its Board of Directors had authorized a $100 million common stock repurchase program under which shares may be repurchased from time to time in the open market or in privately negotiated transactions, subject to market conditions and other factors. Common stock repurchased during 2015 was acquired at an average cost of $35.90 per common share, which results in a remaining repurchase authority for the common stock repurchase program of $26.7 million at December 31, 2015 . On June 8, 2011, the U.S. Treasury closed an underwritten public offering of 3,282,276 warrants issued in connection with the Company’s participation in the Capital Purchase Program, each representing the right to purchase one share of Webster common stock, $0.01 par value per share. The warrants have an exercise price of $18.28 , expire on November 21, 2018. The Company did not receive any of the proceeds of the warrant offering; however, Webster paid $14.4 million to purchase 2,282,276 warrants at auction, which were subsequently canceled. The Company purchased 1,210 warrants from the open market, while 58,365 warrants were exercised in cashless exchanges, during 2015 leaving 63,344 warrants outstanding and exercisable at December 31, 2015 . On June 1, 2015, Webster exercised its right, as specified in the Prospectus Supplement, for conversion of all the outstanding shares of 8.50% Series A Non-Cumulative Perpetual Convertible Preferred Stock, par value $0.01 per share ("Series A Preferred Stock") for Webster common stock, issued from treasury stock held. Each share of Series A Preferred Stock received 36.8046 shares of Webster common stock, reflecting an approximate conversion price of $27.17 per share based on the initial issuance price of $1,000 per share of Series A Preferred Stock, and cash in lieu of any fractional share of common stock. Preferred Stock On December 4, 2012, Webster closed on a public offering of 5,060,000 depository shares, each representing 1/1000th ownership interest in a share of Webster's 6.40% Series E Non-Cumulative Perpetual Preferred Stock, par value $0.01 per share, with a liquidation preference of $25,000 per share (equivalent to $25 per depository share) (the "Series E Preferred Stock"). Webster will pay dividends as declared by the Board of Directors or a duly authorized committee of the Board. Dividends are payable at a rate of 6.40% per annum, quarterly in arrears, on the fifteenth day of each March, June, September, and December. Dividends on the Series E Preferred Stock are not cumulative and are not mandatory. If for any reason the Board of Directors or a duly authorized Committee of the Board does not declare a dividend on the Series E Preferred Stock for any dividend period, such dividend will not accrue or be payable, and Webster will have no obligation to pay dividends for such dividend period, whether or not dividends are declared for any future dividend periods. The terms of the Series E Preferred Stock prohibit the Company from declaring or paying any cash dividends on its common stock, unless Webster has declared and paid full dividends on the Series E Preferred Stock for the most recently completed dividend period. The Company may redeem the Series E Preferred Stock, at its option in whole or in part, on December 15, 2017, or any dividend payment date thereafter, or in whole but not in part upon a "regulatory capital treatment event" as defined in the Prospectus Supplement, at a redemption price equal to the liquidation preference plus any declared and unpaid dividends, without accumulation of any undeclared dividends. The Series E Preferred Stock does not have any voting rights except with respect to authorizing or increasing the authorized amount of senior stock, certain changes to the terms of the Series E Preferred Stock, or in the case of certain dividend nonpayments.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net of Tax	12 Months Ended
Accumulated Other Comprehensive Loss, Net of Tax	Dec. 31, 2015
Equity [Abstract]
Accumulated Other Comprehensive Loss, Net of Tax	Accumulated Other Comprehensive Loss, Net of Tax The following table summarizes the changes in accumulated other comprehensive loss, net of tax by component: (In thousands) Available For Sale and Transferred Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance at December 31, 2012 $ 42,741 $ (27,902 ) $ (47,105 ) $ (32,266 ) Other comprehensive (loss) income before reclassifications (49,572 ) 3,744 17,298 (28,530 ) Amounts reclassified from accumulated other comprehensive income (loss) 4,214 5,952 2,081 12,247 Net current-period other comprehensive (loss) income, net of tax (45,358 ) 9,696 19,379 (16,283 ) Balance at December 31, 2013 (2,617 ) (18,206 ) (27,726 ) (48,549 ) Other comprehensive income (loss) before reclassifications 21,811 (12,506 ) (19,496 ) (10,191 ) Amounts reclassified from accumulated other comprehensive income (loss) (2,773 ) 5,182 70 2,479 Net current-period other comprehensive income (loss), net of tax 19,038 (7,324 ) (19,426 ) (7,712 ) Balance at December 31, 2014 16,421 (25,530 ) (47,152 ) (56,261 ) Other comprehensive (loss) income before reclassifications (22,512 ) (3,136 ) (3,395 ) (29,043 ) Amounts reclassified from accumulated other comprehensive income (loss) (316 ) 5,686 1,828 7,198 Net current-period other comprehensive (loss) income, net of tax (22,828 ) 2,550 (1,567 ) (21,845 ) Balance at December 31, 2015 $ (6,407 ) $ (22,980 ) $ (48,719 ) $ (78,106 ) The following table provides information for the items reclassified from accumulated other comprehensive loss, net of tax: Years ended December 31, Accumulated Other Comprehensive Loss Components 2015 2014 2013 Associated Line Item in the Consolidated Statements Of Income (In thousands) Available-for-sale and transferred securities: Unrealized gains (losses) on investments $ 609 $ 5,499 $ 712 Gain on sale of investment securities, net Unrealized gains (losses) on investments (110 ) (1,145 ) (7,277 ) Impairment loss recognized in earnings Tax (expense) benefit (183 ) (1,581 ) 2,351 Income tax expense Net of tax $ 316 $ 2,773 $ (4,214 ) Derivative instruments: Cash flow hedges $ (8,965 ) $ (8,100 ) $ (9,272 ) Total interest expense Tax benefit 3,279 2,918 3,320 Income tax expense Net of tax $ (5,686 ) $ (5,182 ) $ (5,952 ) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (2,809 ) $ (37 ) $ (3,169 ) Compensation and benefits Prior service costs (73 ) (73 ) (73 ) Compensation and benefits Tax benefit 1,054 40 1,161 Income tax expense Net of tax $ (1,828 ) $ (70 ) $ (2,081 ) The following tables summarize the items and related tax effects for each component of other comprehensive loss, net of tax: Year ended December 31, 2015 (In thousands) Pre-Tax Amount Tax Benefit (Expense) Net of Tax Amount Available-for-sale and transferred securities: Net unrealized loss during the period $ (35,701 ) $ 13,166 $ (22,535 ) Reclassification for net gain included in net income (609 ) 223 (386 ) Net non-credit other than temporary impairment 110 (40 ) 70 Amortization of unrealized loss on securities transferred to held-to-maturity 37 (14 ) 23 Total available-for-sale and transferred securities (36,163 ) 13,335 (22,828 ) Derivative instruments: Net unrealized loss during the period (4,945 ) 1,809 (3,136 ) Reclassification adjustment for net loss included in net income 8,965 (3,279 ) 5,686 Total derivative instruments 4,020 (1,470 ) 2,550 Defined benefit pension and other postretirement benefit plans: Current year actuarial loss (5,367 ) 1,972 (3,395 ) Reclassification adjustment for amortization of net loss included in net income 2,809 (1,027 ) 1,782 Reclassification adjustment for prior service cost included in net income 73 (27 ) 46 Total defined benefit pension and postretirement benefit plans (2,485 ) 918 (1,567 ) Other comprehensive loss $ (34,628 ) $ 12,783 $ (21,845 ) Year ended December 31, 2014 (In thousands) Pre-Tax Amount Tax Benefit (Expense) Net of Tax Amount Available-for-sale and transferred securities: Net unrealized gain during the period $ 34,242 $ (12,469 ) $ 21,773 Reclassification for net gain included in net income (5,499 ) 1,999 (3,500 ) Net non-credit other than temporary impairment 1,145 (418 ) 727 Amortization of unrealized loss on securities transferred to held-to-maturity 60 (22 ) 38 Total available-for-sale and transferred securities 29,948 (10,910 ) 19,038 Derivative instruments: Net unrealized loss during the period (19,589 ) 7,083 (12,506 ) Reclassification adjustment for net loss included in net income 8,100 (2,918 ) 5,182 Total derivative instruments (11,489 ) 4,165 (7,324 ) Defined benefit pension and other postretirement benefit plans: Current year actuarial loss (30,683 ) 11,187 (19,496 ) Reclassification adjustment for amortization of net loss included in net income 37 (14 ) 23 Reclassification adjustment for prior service cost included in net income 73 (26 ) 47 Total defined benefit pension and postretirement benefit plans (30,573 ) 11,147 (19,426 ) Other comprehensive loss $ (12,114 ) $ 4,402 $ (7,712 ) Year ended December 31, 2013 (In thousands) Pre-Tax Amount Tax Benefit (Expense) Net of Tax Amount Available-for-sale and transferred securities: Net unrealized loss during the period $ (77,524 ) $ 27,762 $ (49,762 ) Reclassification for net gain included in net income (712 ) 255 (457 ) Net non-credit other than temporary impairment 7,277 (2,606 ) 4,671 Amortization of unrealized loss on securities transferred to held-to-maturity 296 (106 ) 190 Total available-for-sale and transferred securities (70,663 ) 25,305 (45,358 ) Derivative instruments: Net unrealized gain during the period 5,826 (2,082 ) 3,744 Reclassification adjustment for net loss included in net income 9,272 (3,320 ) 5,952 Total derivative instruments 15,098 (5,402 ) 9,696 Defined benefit pension and other postretirement benefit plans: Current year actuarial gain 26,949 (9,651 ) 17,298 Reclassification adjustment for amortization of net loss included in net income 3,169 (1,135 ) 2,034 Reclassification adjustment for prior service cost included in net income 73 (26 ) 47 Total defined benefit pension and postretirement benefit plans 30,191 (10,812 ) 19,379 Other comprehensive loss $ (25,374 ) $ 9,091 $ (16,283 )

Regulatory Matters

Regulatory Matters	12 Months Ended
Regulatory Matters	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Regulatory Matters	Regulatory Matters Capital Requirements Webster is subject to regulatory capital requirements administered by the Federal Reserve, while Webster Bank is subject to regulatory capital requirements administered by the Office of the Comptroller of the Currency ("OCC"). Regulatory authorities can initiate certain mandatory actions if Webster or Webster Bank fail to meet minimum capital requirements, which could have a direct material effect on the Company's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, both the Company and Webster Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. These quantitative measures, to ensure capital adequacy, require minimum amounts and ratios. Basel III rules enhanced the comprehensive methodology for calculating risk-weighted assets which vary by asset class previously established under Basel I rules. Under Basel III, total risk-based capital is comprised of three categories: Common Equity Tier 1 capital ("CET1 capital"); additional Tier 1 capital; and Tier 2 capital. CET1 capital includes common shareholders' equity, less deductions for goodwill, other intangibles, and certain deferred tax losses. Webster's common shareholders' equity, for purposes of CET1, excludes accumulated other comprehensive components as permitted by the opt-out election taken by Webster upon adoption of Basel III. Tier 1 capital is comprised of CET1 capital plus perpetual preferred stock, while Tier 2 capital includes qualifying subordinated debt and qualifying allowance for credit losses, that together equal total capital. Basel III became effective on January 1, 2015 for non-advanced approach banks as defined, and all prior period data is based on Basel I rules. The following table provides information on the capital ratios for Webster Financial Corporation and Webster Bank, N.A.: Actual (1) Capital Requirements (1) Minimum Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio At December 31, 2015 Webster Financial Corporation Common equity tier 1 risk-based capital $ 1,825,717 10.7 % $ 766,928 4.5 % $ 1,107,785 6.5 % Total risk-based capital 2,201,928 12.9 1,363,427 8.0 1,704,284 10.0 Tier 1 risk-based capital 1,966,829 11.5 1,022,570 6.0 1,363,427 8.0 Tier 1 leverage capital 1,966,829 8.2 954,403 4.0 1,193,004 5.0 Webster Bank, N.A. Common equity tier 1 risk-based capital $ 1,870,852 11.0 % $ 765,232 4.5 % $ 1,105,335 6.5 % Total risk-based capital 2,047,961 12.0 1,360,412 8.0 1,700,515 10.0 Tier 1 risk-based capital 1,870,852 11.0 1,020,309 6.0 1,360,412 8.0 Tier 1 leverage capital 1,870,852 7.9 953,371 4.0 1,191,714 5.0 At December 31, 2014 Webster Financial Corporation Total risk-based capital $ 2,096,772 14.1 % $ 1,192,651 8.0 % $ 1,490,814 10.0 % Tier 1 risk-based capital 1,931,276 13.0 596,326 4.0 894,488 6.0 Tier 1 leverage capital 1,931,276 9.0 859,241 4.0 1,074,051 5.0 Webster Bank, N.A. Total risk-based capital $ 1,939,229 13.0 % $ 1,190,242 8.0 % $ 1,487,803 10.0 % Tier 1 risk-based capital 1,774,814 11.9 595,121 4.0 892,682 6.0 Tier 1 leverage capital 1,774,814 8.3 858,197 4.0 1,072,746 5.0 (1) Calculated under the Basel III capital standard at December 31, 2015 and under the Basel I capital standard at December 31, 2014 . Dividend Restrictions In the ordinary course of business, Webster is dependent upon dividends from Webster Bank to provide funds for its cash requirements, including payments of dividends to shareholders. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of Webster Bank to fall below specified minimum levels, or if dividends declared exceed the net income for that year combined with the undistributed net income for the preceding two years. In addition, the OCC has discretion to prohibit any otherwise permitted capital distribution on general safety and soundness grounds. Dividends paid by Webster Bank to Webster totaled $110 million and $100 million during the years ended December 31, 2015 and 2014 , respectively. Cash Restrictions Webster Bank is required by FRB regulations to hold cash reserve balances on hand or with the Federal Reserve Banks. Pursuant to this requirement, the Bank held $109.4 million and $38.3 million at December 31, 2015 and 2014 , respectively.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
Earnings Per Common Share	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Reconciliation of the calculation of basic and diluted earnings per common share follows: Years ended December 31, (In thousands, except per share data) 2015 2014 2013 Earnings for basic and diluted earnings per common share: Net income $ 206,340 $ 199,726 $ 179,456 Less: Preferred stock dividends 8,711 10,556 10,803 Net income available to common shareholders 197,629 189,170 168,653 Less: Earnings applicable to participating securities 660 674 617 Earnings applicable to common shareholders $ 196,969 $ 188,496 $ 168,036 Shares: Weighted-average common shares outstanding - basic 90,968 89,899 88,713 Effect of dilutive securities: Stock options and restricted stock 524 466 436 Warrants - US Treasury 41 255 190 Warrants - Warburg — — 922 Weighted-average common shares outstanding - diluted 91,533 90,620 90,261 Earnings per common share: Basic $ 2.17 $ 2.10 $ 1.90 Diluted 2.15 2.08 1.86 Potential common shares excluded from the effect of dilutive securities because they would have been anti-dilutive, are as follows: Years ended December 31, (In thousands) 2015 2014 2013 Stock options (shares with exercise price greater than market price) 213 587 850 Restricted stock (due to performance conditions on non-participating shares) 92 171 201 Basic weighted-average common shares outstanding includes the effect of conversion of the Series A Preferred Stock which occurred on June 1, 2015. Prior to that, the Series A Preferred Stock was considered to be anti-dilutive. Refer to Note 11: Shareholders' Equity and Note 18: Share-Based Plans for further information relating to potential common shares excluded from the effect of dilutive securities.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
Derivative Financial Instruments	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Risk Management Objective of Using Derivatives Webster manages economic risks, including interest rate, liquidity, and credit risk by managing the amount, sources, and duration of its debt funding along with the use of interest rate derivative financial instruments. Webster enters into interest rate derivative financial instruments to manage exposure related to business activities that result in the receipt or payment of both future known and uncertain cash amounts determined by interest rates. Webster’s primary objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, Webster uses interest rate swaps and interest rate caps as part of its interest rate risk management strategy. Interest rate swaps and caps designated as cash flow hedges are designed to manage the risk associated with a forecasted event or an uncertain variable-rate cash flow. Forward-settle interest rate swaps protect the Company against adverse fluctuations in interest rates by reducing its exposure to variability in cash flows relating to interest payments on forecasted debt issuances. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for payment of an up-front premium. The effective portion of the change in the fair value of derivatives designated and that qualify as cash flow hedges is recorded as accumulated other comprehensive loss ("AOCL") and is reclassified into earnings in the subsequent periods that the hedged forecasted transaction affects earnings. During the year ended December 31, 2015 , such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt and forecasted issuances of debt. The ineffective portion of the change in the fair value of the derivatives is recognized directly in earnings. During the years ended December 31, 2015 , 2014 , and 2013 , the Company recorded no ineffectiveness, or immaterial amounts of ineffectiveness, in earnings attributable to the difference in the effective date of the hedge and the effective date of the debt issuance. Webster is also exposed to changes in the fair value of certain of its fixed-rate obligations due to changes in benchmark interest rates. Webster, on occasion, uses interest rate swaps to manage its exposure to changes in fair value on these obligations attributable to changes in the benchmark interest rates. Interest rate swaps designated as fair value hedges involve the receipt of fixed-rate amounts from a counterparty in exchange for Webster making variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. For a qualifying derivative designated as a fair value hedge, the gain or loss on the derivative, as well as the gain or loss on the hedged item, is recognized in interest expense. Webster did not have interest rate derivative financial instruments designated as fair value hedges at December 31, 2015 and December 31, 2014 . As a result, there was no impact on interest expense related to fair value hedges during the year ended December 31, 2015 , while there was a reduction to interest expense of $1.1 million and $3.4 million for the years ended December 31, 2014 and 2013 , respectively, related to previous fair value hedges. Additional derivative instruments include interest rate swap and cap contracts sold to commercial and other customers who wish to modify loan interest rate sensitivity. These contracts are offset with dealer counterparty transactions structured with matching terms. As a result, there is minimal impact on earnings, except for fee income earned in such transactions which is recorded in other non-interest income. The Company enters into Risk Participation Agreements ("RPA") as financial guarantees of performance on interest rate swap derivatives. The purchased (asset) or sold (liability) guarantee allows the Company to participate-in (for a fee received) or participate-out (for a fee paid) the risk associated with certain derivative positions executed with the borrower by a lead bank. The RPA guarantee is recorded on the balance sheet at fair value, with changes in fair value recognized each period in other non-interest income. Other derivatives include foreign currency forward contracts related to lending arrangements and a VISA equity swap transaction, neither of which are designated for hedge accounting. Derivative Positions The notional amounts of derivative instruments are shown in the table below: At December 31, (In thousands) 2015 2014 Interest rate derivatives $ 5,366,372 $ 10,237,325 RPA-In 92,985 55,626 RPA-Out 41,798 34,822 Other 12,858 60 Total notional amount of derivative instruments $ 5,514,013 $ 10,327,833 The table below presents the fair value for derivative instruments as classified in the accompanying Consolidated Balance Sheets: At December 31, 2015 2014 (In thousands) Other Assets Other Liabilities Other Assets Other Liabilities Derivatives designated as hedging instruments: Interest rate derivatives $ 2,507 $ 1,359 $ 4,481 $ 4,598 Derivatives not designated as hedging instruments: Interest rate derivatives 58,304 38,619 48,209 31,915 RPA-In — 245 — 258 RPA-Out 153 — 182 — Other 183 75 — 7 Total derivatives not designated as hedging instruments $ 58,640 $ 38,939 $ 48,391 $ 32,180 Changes in the fair value of derivatives not qualifying for hedge accounting treatment are reported as a component of other non-interest income in the accompanying Consolidated Statements of Income as follows: Years ended December 31, (In thousands) 2015 2014 2013 Interest rate derivatives $ 4,361 $ 4,482 $ 3,244 RPA (33 ) 51 — Other (63 ) (253 ) (120 ) Total impact on non-interest income $ 4,265 $ 4,280 $ 3,124 Information about the valuation methods used to measure fair value is provided in Note 16: Fair Value Measurements . Amounts Recorded in AOCL Related to Cash Flow Hedges Amounts for the effective portion of changes in the fair value of derivatives are reclassified to interest expense as interest payments are made on Webster's variable-rate debt. Over the next twelve months, the Company estimates that $1.7 million will be reclassified from AOCL as an increase to interest expense. Webster records gains and losses related to swap terminations as OCI. These balances are subsequently amortized into interest expense over the respective terms of the hedged debt instruments. At December 31, 2015 , the remaining unamortized loss on the termination of cash flow hedges is $29.0 million . Over the next twelve months, the Company estimates that $7.7 million will be reclassified from AOCL as an increase to interest expense. Additional information about cash flow hedge activity impacting AOCL, and the related amounts reclassified to interest expense is provided in Note 12: Accumulated Other Comprehensive Loss, Net of Tax . Offsetting Derivatives Webster has entered into transactions with counterparties that are subject to a master netting agreement. Hedge accounting positions are recorded on a gross basis in other assets for a gain position and in other liabilities for a loss position, while non-hedge accounting net positions are recorded in other assets for a net gain position or in other liabilities for a net loss position, in the accompanying Consolidated Balance Sheets. The tables below present the financial assets and liabilities for non-customer derivative positions, including futures contracts, summarized by dealer counterparty, or Webster's designated derivative clearing organization ("DCO"): At December 31, 2015 Notional Amount Hedge Accounting Positions Non-Hedge Accounting Positions Liability, net Cash Collateral Posted Net Exposure (1) (In thousands) Gain Loss Gain Loss Dealer A $ 391,745 $ 248 $ (1,359 ) $ 504 $ (3,439 ) $ (4,046 ) $ 3,800 $ — Dealer B 274,353 752 — 348 (4,104 ) (3,004 ) 3,020 16 Dealer C 5,775 — — — (433 ) (433 ) — — Dealer D 387,550 377 — 125 (2,048 ) (1,546 ) 1,300 — Dealer E 421,545 1,130 — 138 (1,912 ) (644 ) 470 — DCO 1,352,206 — — 1,140 (28,366 ) (27,226 ) 42,975 15,749 Total $ 2,833,174 $ 2,507 $ (1,359 ) $ 2,255 $ (40,302 ) $ (36,899 ) $ 51,565 At December 31, 2014 Notional Amount Hedge Accounting Positions Non-Hedge Accounting Positions (Liability)/ Asset, net Cash Collateral Posted (Received) Net Exposure (1) (In thousands) Gain Loss Gain Loss Dealer A $ 427,430 $ — $ (739 ) $ 1,861 $ (6,576 ) $ (5,454 ) $ 5,300 $ — Dealer B 319,663 1,494 — 978 (6,420 ) (3,948 ) 3,610 — Dealer C 11,538 — — — (834 ) (834 ) — — Dealer D 303,663 747 — 1,147 (1,627 ) 267 (400 ) — Dealer E 424,401 2,240 — 867 (1,698 ) 1,409 (1,420 ) — DCO 6,631,936 — (3,858 ) 555 (17,629 ) (20,932 ) 39,037 18,105 Total $ 8,118,631 $ 4,481 $ (4,597 ) $ 5,408 $ (34,784 ) $ (29,492 ) $ 46,127 (1) Net positive exposure represents over-collateralized loss positions which can result from DCO initial margin requirements posted in compliance with the Dodd-Frank Wall Street Reform and Consumer Protection Act. Counterparty Credit Risk Derivative contracts involve the risk of dealing with both bank customers and institutional derivative counterparties and their ability to meet contractual terms. The Company has International Swap Derivative Association ("ISDA") Master agreements, including a Credit Support Annex ("CSA"), with all derivative counterparties. The ISDA Master agreements provide that on each payment date, all amounts otherwise owing the same currency under the same transaction are netted so that only a single amount is owed in that currency. The ISDA provides, if the parties so elect, for such netting of amounts in the same currency among all transactions identified as being subject to such election that have common payment dates and booking offices. Under the CSA, daily net exposure in excess of a negotiated threshold is secured by posted cash collateral. The Company has negotiated a zero threshold with the majority of its approved financial institution counterparties. In accordance with Webster policies, institutional counterparties must be analyzed and approved through the Company’s credit approval process. The Company’s credit exposure on interest rate derivatives with non-dealer counterparties is limited to the net favorable value, including accrued interest, of all such instruments, reduced by the amount of collateral pledged by the counterparties. The Company's credit exposure related to derivatives with dealer counterparties is significantly mitigated with cash collateral equal to or in excess of the market value of the instrument, updated daily. In accordance with counterparty credit agreements and derivative clearing rules, the Company had approximately $51.6 million in net margin collateral posted with financial counterparties at December 31, 2015 , all of which is comprised of margin collateral posted to financial counterparties or DCO. Collateral levels for approved financial institution counterparties are monitored daily and adjusted as necessary. In the event of default, should the collateral not be returned, the exposure would be offset by terminating the transaction. The Company regularly evaluates the credit risk of its counterparties, taking into account the likelihood of default, net exposures, and remaining contractual life, among other related factors. The Company's net current credit exposure relating to interest rate derivatives with Webster Bank customers was $58.3 million at December 31, 2015 . In addition, the Company monitors potential future exposure, representing its best estimate of exposure to remaining contractual maturity. The potential future exposure relating to interest rate derivatives with Webster Bank customers totaled $19.8 million at December 31, 2015 . The credit exposure is mitigated as transactions with customers are generally secured by the same collateral of the underlying transactions being hedged. Mortgage Banking Derivatives Forward sales of mortgage loans and MBS are utilized by Webster in its efforts to manage risk of loss associated with its mortgage loan commitments and mortgage loans held for sale. Prior to closing and funding certain single-family residential mortgage loans, interest rate lock commitments are generally extended to the borrowers. During the period from commitment date to closing date, Webster is subject to the risk that market rates of interest may change. If market rates rise, investors generally will pay less to purchase such loans causing a reduction in the anticipated gain on sale of the loans and possibly resulting in a loss. In an effort to mitigate such risk, forward delivery sales commitments are established under which Webster agrees to deliver whole mortgage loans to various investors or issue MBS. At December 31, 2015 , outstanding rate locks totaled approximately $62.5 million and the outstanding commitments to sell residential mortgage loans totaled approximately $84.4 million . Forward sales, which include mandatory forward commitments of approximately $82.0 million at December 31, 2015 , establish the price to be received upon the sale of the related mortgage loan, thereby mitigating certain interest rate risk. There is; however, still certain execution risk specifically related to Webster’s ability to close and deliver to its investors the mortgage loans it has committed to sell. The interest rate locked loan commitments and forward sales commitments are recorded at fair value, with changes in fair value recorded as non-interest income in the accompanying Consolidated Statements of Income. The fair value of interest rate locked loan and forward sales commitments totaled gains of $819 thousand and $18 thousand , at December 31, 2015 and 2014 , respectively, and are recorded as a component of other assets in the accompanying Consolidated Balance Sheets.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements 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. Fair value is best determined using quoted market prices. However, in many instances, quoted market prices are not available. In such instances, fair values are determined using appropriate valuation techniques. Various assumptions and observable inputs must be relied upon in applying these techniques. Accordingly, categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. As such, the fair value estimates may not be realized in an immediate transfer of the respective asset or liability. Fair Value Hierarchy The three levels within the fair value hierarchy are as follows: • Level 1: Valuation is based upon unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. • Level 2: Fair value is calculated using inputs other than quoted market prices that are directly or indirectly observable for the asset or liability. The valuation may rely on quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit ratings, etc.), or inputs that are derived principally or corroborated by market data, by correlation, or other means. • Level 3: Inputs for determining the fair value of the respective assets or liabilities are not observable. Level 3 valuations are reliant upon pricing models and techniques that require significant management judgment or estimation. Assets and Liabilities Measured at Fair Value on a Recurring Basis Available-for-Sale Investment Securities. When quoted prices are available in an active market, the Company classifies securities within Level 1 of the valuation hierarchy. Level 1 securities include equity securities in financial institutions and U.S. Treasury Bills. If quoted market prices are not available, the Company classifies securities within Level 2 of the valuation hierarchy, and employs an independent pricing service that utilizes matrix pricing to calculate fair value. Such fair value measurements consider observable data such as dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayments speeds, credit information, and respective terms and conditions for debt instruments. Management maintains procedures to monitor the pricing service's assumptions and establishes processes to challenge the pricing service's valuations that appear unusual or unexpected. Level 2 securities include agency CMO, agency MBS, agency CMBS, non-agency CMBS, CLO, single-issuer trust preferred securities, and corporate debt securities. Derivative Instruments. Foreign exchange contracts are valued based on unadjusted quoted prices in active markets and classified within Level 1 of the fair value hierarchy. Derivative instruments are valued using third-party valuation software, which considers the present value of cash flows discounted using observable forward rate assumptions. The resulting fair values are validated against valuations performed by independent third parties and are classified within Level 2 of the fair value hierarchy. In determining if any fair value adjustment related to credit risk is required, Webster evaluates the credit risk of its counterparties by considering factors such as the likelihood of default by the counterparties, its net exposures, the remaining contractual life, as well as the amount of collateral securing the position. Webster reviews its counterparty exposure on a regular basis, and, when necessary, appropriate business actions are taken to adjust the exposure. When determining fair value, Webster applies the portfolio exception with respect to measuring counterparty credit risk for all of its derivative transactions subject to a master netting arrangement. The change in value of derivative assets and liabilities attributable to credit risk was not significant during the reported periods. Mortgage Banking Derivatives. Mortgage-backed securities are utilized by the Company in its efforts to manage risk of loss associated with its mortgage loan commitments and mortgage loans held for sale. Prior to closing and funding certain single-family residential mortgage loans, an interest rate lock commitment is generally extended to the borrower. During the period from commitment date to closing date, the Company is subject to the risk that market rates of interest may change. If market rates rise, investors generally will pay less to purchase such loans resulting in a reduction in the gain on sale of the loans or, possibly, a loss. In an effort to mitigate such risk, forward delivery sales commitments are established, under which the Company agrees to deliver whole mortgage loans to various investors or issue mortgage-backed securities. The fair value of mortgage banking derivatives is determined based on current market prices for similar assets in the secondary market and therefore, classified within Level 2 of the fair value hierarchy. Investments Held in Rabbi Trust. Investments held in the Rabbi Trust primarily include mutual funds that invest in equity and fixed income securities. Shares of mutual funds are valued based on net asset value, which represents quoted market prices for the underlying shares held in the mutual funds. Therefore, investments held in the Rabbi Trust are classified within Level 1 of the fair value hierarchy. Webster has elected to measure the investments held in the Rabbi Trust at fair value. The Company consolidates the invested assets of the trust along with the total deferred compensation obligations and includes them in other assets and other liabilities, respectively, in the accompanying Consolidated Balance Sheets. Earnings in the Rabbi Trust, including appreciation or depreciation, are reflected as other non-interest income, and changes in the corresponding liability are reflected as compensation and benefits in the accompanying Consolidated Statements of Income. The cost basis of the investments held in Rabbi Trust is $3.9 million as of December 31, 2015 . Alternative Investments. The Company generally records alternative investments at cost, subject to impairment testing. The alternative investments that are carried at cost are considered to be measured at fair value on a non-recurring basis when there is impairment. There are certain funds in which the ownership percentage is greater than 3% and are therefore, recorded at fair value on a recurring basis based upon the net asset value of the respective fund. Alternative investments are non-public entities that cannot be redeemed since the Company’s investment is distributed as the underlying investments are liquidated. As such, these investments are classified within Level 3 of the fair value hierarchy. The Company has $6.8 million in unfunded commitments remaining for its alternative investments as of December 31, 2015 . See the Investment Securities Portfolio section of Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations for additional discussion of the Company's alternative investments. Contingent Consideration. The contingent consideration arrangement entitles the Company to receive a rebate of the purchase price relating to the premium paid for account attrition that occurs during the eighteen-month period beginning on the acquisition date. The valuation is reliant upon a pricing model and techniques that require significant management judgment or estimation. Therefore, the contingent consideration is classified within Level 3 of the fair value hierarchy. The key assumptions considered in the valuation model are a 2.5% annual growth rate in deposits, a 13.0% annual account attrition rate plus approximately 6.0% of shock attrition in 2015, a 16.5% discount rate, and a premium on deposits of 4.5% . Subsequent to acquisition closing, the fair value will adjusted for any changes primarily in attrition milestones. Contingent Liability. The liability valuation is based upon unobservable inputs. Therefore, the contingent liability is classified within Level 3 of the fair value hierarchy. The fair value of the contingency represents the estimated price to transfer the liability between market participants at the measurement date under current market conditions. Summaries of the fair values of assets and liabilities measured at fair value on a recurring basis are as follows: At December 31, 2015 (In thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets held at fair value: Available-for-sale investment securities: U.S. Treasury Bills $ 924 $ 924 $ — $ — Agency CMO 548,754 — 548,754 — Agency MBS 1,065,109 — 1,065,109 — Agency CMBS 215,350 — 215,350 — Non-agency CMBS 579,266 — 579,266 — CLO 429,159 — 429,159 — Single issuer trust preferred securities 37,170 — 37,170 — Corporate debt 106,321 — 106,321 — Equity securities 2,578 2,578 — — Total available-for-sale investment securities 2,984,631 3,502 2,981,129 — Derivative instruments 61,147 183 60,964 — Mortgage banking derivatives 819 — 819 — Investments held in Rabbi Trust 5,372 5,372 — — Alternative investments 3,471 — — 3,471 Contingent Consideration 5,331 — — 5,331 Total financial assets held at fair value $ 3,060,771 $ 9,057 $ 3,042,912 $ 8,802 Financial liabilities held at fair value: Derivative instruments $ 40,298 $ 66 $ 40,232 $ — Contingent Liability 6,000 — — 6,000 Total financial liabilities held at fair value $ 46,298 $ 66 $ 40,232 $ 6,000 At December 31, 2014 (In thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets held at fair value: Available-for-sale investment securities: U.S. Treasury Bills $ 525 $ 525 $ — $ — Agency CMO 550,988 — 550,988 — Agency MBS 1,028,518 — 1,028,518 — Agency CMBS 80,266 — 80,266 — Non-agency CMBS 553,393 — 553,393 — CLO 425,734 — 425,734 — Single issuer trust preferred securities 38,245 — 38,245 — Corporate debt 110,301 — 110,301 — Equity securities 5,903 5,903 — — Total available-for-sale investment securities 2,793,873 6,428 2,787,445 — Derivative instruments 52,872 — 52,872 — Mortgage banking derivatives 18 — 18 — Investments held in Rabbi Trust 5,901 5,901 — — Alternative investments 475 — — 475 Total financial assets held at fair value $ 2,853,139 $ 12,329 $ 2,840,335 $ 475 Financial liabilities held at fair value: Derivative instruments $ 36,777 $ 293 $ 36,484 $ — Contingent Liability — — — — Total financial liabilities held at fair value $ 36,777 $ 293 $ 36,484 $ — The following table presents the changes in Level 3 assets that are measured at fair value on a recurring basis: Financial Assets (In thousands) Alternative Investments Contingent Consideration Total Contingent Liability Balance at January 1, 2015 $ 475 $ — $ 475 $ — Acquisition — 5,000 5,000 6,000 Unrealized (loss) gain included in net income (170 ) 331 161 — Purchases/capital funding 3,219 — 3,219 — Distributions (53 ) — (53 ) — Balance at December 31, 2015 $ 3,471 $ 5,331 $ 8,802 $ 6,000 Assets Measured at Fair Value on a Non-Recurring Basis Certain assets are measured at fair value on a non-recurring basis, that is, the assets are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances, for example, when there is evidence of impairment. The following is a description of valuation methodologies used for assets measured on a non-recurring basis. Loans Held for Sale. Loans held for sale are accounted for at the lower of cost or market and are considered to be recognized at fair value when they are recorded at below cost. The fair value of residential mortgage loans held for sale is based on quoted market prices of similar loans sold in conjunction with securitization transactions. Accordingly, such loans are classified within Level 2 of the fair value hierarchy. On occasion, the loans held for sale portfolio includes commercial loans, which require adjustments for changes in loan characteristics. When observable data is unavailable, such loans are classified within Level 3. Collateral Dependent Impaired Loans and Leases. Impaired loans and leases for which repayment is expected to be provided solely by the value of the underlying collateral are considered collateral dependent and are valued based on the estimated fair value of such collateral using customized discounting criteria. As such, collateral dependent impaired loans and leases are classified as Level 3 of the fair value hierarchy. Other Real Estate Owned (OREO) and Repossessed Assets. The total book value of OREO and repossessed assets was $5.0 million at December 31, 2015 . OREO and repossessed assets are accounted for at the lower of cost or market and are considered to be recognized at fair value when they are recorded at below cost. The fair value of OREO is based on independent appraisals or internal valuation methods, less estimated selling costs. The valuation may consider available pricing guides, auction results, and price opinions. Certain assets require assumptions about factors that are not observable in an active market in the determination of fair value, as such, OREO and repossessed assets are classified as Level 3 of the fair value hierarchy. Mortgage Servicing Assets. Mortgage servicing assets are accounted for at cost, subject to impairment testing. When the carrying cost exceeds fair value, a valuation allowance is established to reduce the carrying cost to fair value. Fair value is calculated as the present value of estimated future net servicing income and relies on market based assumptions for loan prepayment speeds, servicing costs, discount rates, and other economic factors, as such, the primary risk inherent in valuing mortgage servicing assets is the impact of fluctuating interest rates on the servicing revenue stream. Mortgage servicing assets are classified within Level 3 of the fair value hierarchy. The table below presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2015 : (Dollars in thousands) Asset Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Impaired loans and leases $ 19,644 Real Estate Appraisals Discount for appraisal type 4% - 15% Discount for costs to sell 0% - 8% Other real estate owned $ 652 Real Estate Appraisals Discount for appraisal type 0% - 20% Discount for costs to sell 8% Mortgage servicing assets $ 33,568 Discounted cash flow Constant prepayment rate 7.4% - 32.4% Discount rates 1.4% - 3.4% Fair Value of Financial Instruments The Company is required to disclose the estimated fair value of financial instruments, both assets and liabilities, for which it is practicable to estimate fair value. The following is a description of valuation methodologies used for those assets and liabilities. Cash, Due from Banks, and Interest-bearing Deposits. The carrying amount of cash, due from banks, and interest-bearing deposits is used to approximate fair value, given the short time frame to maturity and, as such, these assets do not present unanticipated credit concerns. Cash, due from banks, and interest-bearing deposits are classified within Level 1 of the fair value hierarchy. Held-to-Maturity Investment Securities. When quoted market prices are not available, the Company employs an independent pricing service to calculate fair value. Such fair value measurements consider observable data such as dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayments speeds, credit information, and respective terms and conditions for debt instruments. Webster has procedures to monitor the pricing service's assumptions and establishes processes to challenge the pricing service's valuations that appear unusual or unexpected. Held-to-maturity investments, which include agency CMO, agency MBS, agency CMBS, Municipal, and Private Label MBS securities, are classified within Level 2 of the fair value hierarchy. Loans and Leases, net. The estimated fair value of loans and leases held for investment is calculated using a discounted cash flow method, using future prepayments and market interest rates inclusive of an illiquidity premium for comparable loans and leases. The associated cash flows are adjusted for credit and other potential losses. Fair value for impaired loans and leases is estimated using the net present value of the expected cash flows. Loans and leases are classified within Level 3 of the fair value hierarchy. Deposit Liabilities. The fair value of demand deposits, savings accounts, and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. Deposit liabilities are classified within Level 2 of the fair value hierarchy. Securities Sold Under Agreements to Repurchase and Other Borrowings. The carrying value is an estimate of fair value for those securities sold under agreements to repurchase and other borrowings that mature within 90 days. The fair values of all other borrowings are estimated using discounted cash flow analysis based on current market rates adjusted, as appropriate, for associated credit risks. Securities sold under agreements to repurchase and other borrowings are classified within Level 2 of the fair value hierarchy. Federal Home Loan Bank Advances and Long-Term Debt. The fair value of FHLB advances and long-term debt is estimated using a discounted cash flow technique. Discount rates are matched with the time period of the expected cash flow and are adjusted, as appropriate, to reflect credit risk. FHLB advances and long-term debt are classified within Level 2 of the fair value hierarchy. The estimated fair values of selected financial instruments are as follows: At December 31, 2015 2014 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Financial Assets: Level 2 Held-to-maturity investment securities $ 3,923,052 $ 3,961,534 $ 3,872,955 $ 3,948,706 Loans held for sale 37,091 37,457 67,952 68,705 Level 3 Loans and leases, net 15,496,745 15,453,892 13,740,761 13,775,850 Mortgage servicing assets (1) 20,698 33,568 19,379 28,690 Alternative investments 12,900 14,294 16,524 18,046 Financial Liabilities: Level 2 Deposit liabilities, other than time deposits $ 15,866,624 $ 15,866,624 $ 13,380,018 $ 13,380,018 Time deposits 2,086,154 2,095,357 2,271,587 2,288,760 Securities sold under agreements to repurchase and other borrowings 1,151,400 1,163,974 1,250,756 1,271,596 Federal Home Loan Bank advances (2) 2,664,139 2,647,872 2,859,431 2,872,515 Long-term debt (3) 226,356 218,143 226,237 227,751 The following adjustments to the carrying amount are not included in the fair value: (1) Mortgage servicing assets is net of reserves of $32 thousand at December 31, 2015 and $23 thousand at December 31, 2014 . (2) FHLB advances is net of unamortized premiums of $24 thousand at December 31, 2015 and $37 thousand at December 31, 2014 . (3) Long-term debt is net of unamortized discounts of $1.0 million at December 31, 2015 and $1.1 million at December 31, 2014 . Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the entire holdings or any part of a particular financial instrument. Fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These factors are subjective in nature and involve uncertainties and matters of significant judgment and therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Retirement Benefit Plans

Retirement Benefit Plans	12 Months Ended
Retirement Benefit Plans	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans Webster Bank offered a defined benefit noncontributory pension plan through December 31, 2007 for eligible employees who met certain minimum service and age requirements. Pension plan benefits were based upon employee earnings during the period of credited service. A supplemental defined benefit retirement plan was also offered to certain employees who were at the Executive Vice President level or above through December 31, 2007. The supplemental defined benefit retirement plan provides eligible participants with additional pension benefits. Webster also provides postretirement healthcare benefits to certain retired employees. The Webster Bank Pension Plan and the supplemental defined benefit retirement plan were frozen as of December 31, 2007. No additional benefits have been accrued since that time. Employees hired on or after January 1, 2007 receive no qualified or supplemental retirement income under the plans. All other employees accrue no additional qualified or supplemental retirement income after January 1, 2008, and the amount of their qualified and supplemental retirement income will not exceed the amount of benefits determined as of December 31, 2007. Additional contributions to the Webster Bank Pension Plan will be made as deemed appropriate by management in conjunction with information provided by the Plan’s actuaries. There were $241 thousand and $143 thousand in Company contributions to the supplemental defined benefit retirement plan for the years ended December 31, 2015 and 2014 , respectively. Effective December 31, 2014 , the mortality assumptions used in the pension liability assessment was updated to the RP-2014 table with the Mercer MMP-2007 mortality improvement projection scale applied generationally. December 31 st is the measurement date used for the pension, supplemental pension, and postretirement benefit plans. The following table sets forth changes in benefit obligation, changes in plan assets, and the funded status of the pension plans and other postretirement benefit plans at December 31: Webster Pension Webster SERP Other Benefits (In thousands) 2015 2014 2015 2014 2015 2014 Change in benefit obligation: Beginning balance $ 210,548 $ 171,189 $ 10,041 $ 8,675 $ 4,133 $ 3,821 Service cost 45 40 — — — — Interest cost 8,008 8,068 345 364 123 139 Actuarial (gain) loss (8,588 ) 38,472 373 1,145 (178 ) 470 Benefits paid and administrative expenses (6,368 ) (7,221 ) (241 ) (143 ) (225 ) (297 ) Ending balance 203,645 210,548 10,518 10,041 3,853 4,133 Change in plan assets: Beginning balance 172,976 162,182 — — — — Actual return on plan assets (5,239 ) 18,015 — — — — Employer contributions — — 241 143 225 297 Benefits paid and administrative expenses (6,368 ) (7,221 ) (241 ) (143 ) (225 ) (297 ) Ending balance 161,369 172,976 — — — — Funded status of the plan at year end $ (42,276 ) $ (37,572 ) $ (10,518 ) $ (10,041 ) $ (3,853 ) $ (4,133 ) The accumulated benefit obligation for the pension plans and the postretirement benefit plan was $218.0 million and $224.7 million at the years ended December 31, 2015 and 2014 , respectively. An asset is recognized for an overfunded plan, and a liability is recognized for an underfunded plan. Amounts recognized in the statement of financial position consist of the following: 2015 2014 (In thousands) Webster Pension Webster SERP Other Benefits Webster Pension Webster SERP Other Benefits Accrued expenses and other liabilities $ (42,276 ) $ (10,518 ) $ (3,853 ) $ (37,572 ) $ (10,041 ) $ (4,133 ) Webster expects that $7.2 million in net actuarial loss and $14 thousand in prior service cost will be recognized as components of net periodic benefit cost in 2016 . The components of accumulated other comprehensive loss related to pensions and other postretirement benefits at December 31, 2015 and 2014 are summarized below: 2015 2014 (In thousands) Webster Webster Other Webster Webster Other Net actuarial loss $ 73,238 $ 2,412 $ 591 $ 70,437 $ 2,430 $ 816 Prior service cost — — 14 — — 87 Total pre-tax amounts included in accumulated other comprehensive loss $ 73,238 $ 2,412 $ 605 $ 70,437 $ 2,430 $ 903 Deferred tax benefit 26,447 871 218 25,415 877 326 Amounts included in accumulated other comprehensive loss, net of tax $ 46,791 $ 1,541 $ 387 $ 45,022 $ 1,553 $ 577 Expected future benefit payments for the pension plans and other postretirement benefit plans are presented below: (In thousands) Webster Pension Webster SERP Other Benefits 2016 $ 7,034 $ 4,015 $ 391 2017 7,785 928 388 2018 8,425 801 380 2019 8,728 5,597 367 2020 9,050 142 349 2021-2025 52,144 679 1,441 The components of the net periodic benefit cost (benefit) for the Company’s defined benefit pension plans were as follows: Years ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 (In thousands) Webster Pension Webster SERP Other Postretirement Benefits Service cost $ 45 $ 40 $ 40 $ — $ — $ — $ — $ — $ — Interest cost on benefit obligations 8,008 8,068 7,365 345 364 289 123 139 109 Expected return on plan assets (11,873 ) (11,495 ) (11,114 ) — — — — — — Amortization of prior service cost — — — — — — 73 73 73 Recognized net loss 5,724 2,781 6,355 390 135 125 47 5 — Net periodic benefit cost (benefit) $ 1,904 $ (606 ) $ 2,646 $ 735 $ 499 $ 414 $ 243 $ 217 $ 182 Changes in funded status related to the Company’s defined benefit pension plans recognized as a component of other comprehensive income in the accompanying Consolidated Statements of Comprehensive Income were as follows: Years ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 (In thousands) Webster Pension Webster SERP Other Postretirement Benefits Net loss (gain) $ 8,525 $ 31,951 $ (23,238 ) $ 372 $ 1,145 $ (160 ) $ (178 ) $ 470 $ (239 ) Amounts reclassified from accumulated other comprehensive income (5,724 ) (2,781 ) (6,355 ) (390 ) (134 ) (125 ) (47 ) (5 ) — Amortization of prior service cost — — — — — — (73 ) (73 ) (73 ) Total loss (gain) recognized in other comprehensive income (loss) $ 2,801 $ 29,170 $ (29,593 ) $ (18 ) $ 1,011 $ (285 ) $ (298 ) $ 392 $ (312 ) Fair Value Measurements The following is a description of the valuation methodologies used for the pension plan assets measured at fair value, including the general classification of such instruments pursuant to the valuation hierarchy: Registered investment companies. Exchange traded funds are quoted at market prices in an exchange and active market, which represent the net asset values of shares held by the plan at year end. Money market funds are shown at cost, which approximates fair value. The exchange traded fund is benchmarked against the S&P 500 Index. Common collective trust. The net asset value ("NAV"), as provided by the trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund less its liabilities. This practical expedient is not used when it is determined to be probable that the fund will sell the investment for an amount different than the reported NAV. Plan transactions (purchases and sales) may occur daily. Were the Plan to initiate a full redemption of the collective trust, the investment adviser reserves the right to temporarily delay withdrawal from the trust in order to ensure that securities liquidations will be carried out in an orderly business manner. The common collective trust funds performance are benchmarked against the Standard and Poor’s 500 Stock Index, the S&P 400 Mid Cap Index, the Russell 2000 Index, the MSCI ACWI ex U.S. Index, and the Barclays Capital U.S. Long Credit Index. Investment contract with insurance company. These investments are valued at fair value by discounting the related cash flows based on current yields of similar instruments with comparable durations considering the credit-worthiness of the issuer. Holdings of insurance company investment contracts are classified as Level 3 investments. A summary of the fair value and hierarchy classification of financial assets of the pension plan is as follows: At December 31, 2015 2014 (In thousands) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Registered investment companies: Exchange traded funds $ 28,329 $ 28,329 $ — $ — $ 28,287 $ 28,287 $ — $ — Cash and cash equivalents 295 295 — — 871 871 — — Common collective funds: Fixed Income funds 80,783 — 80,783 — 94,928 — 94,928 — Equity Funds 51,028 — 51,028 — 47,813 — 47,813 — Insurance company investment contract 934 — — 934 1,077 — — 1,077 Total $ 161,369 $ 28,624 $ 131,811 $ 934 $ 172,976 $ 29,158 $ 142,741 $ 1,077 The following table sets forth a summary of changes in the fair value of Level 3 assets of the pension plan: Years ended December 31, (In thousands) 2015 2014 Beginning balance $ 1,077 $ 1,196 Unrealized gains relating to instruments still held at the reporting date (28 ) (2 ) Benefit payments, administrative expenses, and interest income, net (115 ) (117 ) Ending balance $ 934 $ 1,077 The following table presents the target allocation and the pension plan asset allocation for the periods indicated, by asset category: Target Allocation Percentage of plan assets 2016 2015 2014 Fixed income investments 50 % 51 % 56 % Equity investments 50 49 44 Total 100 % 100 % 100 % The Retirement Plan Committee (the “Committee”) is a fiduciary under ERISA and is charged with the responsibility for directing and monitoring the investment management of the pension plan. To assist the Committee in this function, it engages the services of investment managers and advisor's who possess the necessary expertise to manage the pension plan assets within the established investment policy guidelines and objectives. The investment policy guidelines and objectives is reviewed at a minimum annually by the Committee. The primary objective of the pension plan investment strategy is to provide long-term total return through capital appreciation and dividend and interest income. The Plan invests in registered investment companies and bank collective trusts. The volatility, as measured by standard deviation, of the pension plan’s assets should not exceed that of the Composite Index. The investment policy guidelines allow the plan assets to be invested in certain types of cash equivalents, fixed income securities, equity securities, mutual funds, and collective trusts. Investments in mutual funds and collective trust funds are substantially limited to funds with the securities characteristic of their assigned benchmarks. The pension plan investment strategy is designed to maintain a diversified portfolio, with a target average long-term rate of 7.00% , however, there is no certainty that the portfolio will perform to expectations. Asset allocations are monitored monthly, and the portfolio is rebalanced as needed. Weighted-average assumptions used to determine benefit obligations at December 31 are as follows: Webster Pension Webster SERP Other Benefits 2015 2014 2015 2014 2015 2014 Discount rate 4.20 % 3.85 % 3.75 % 3.50 % 3.35 % 3.15 % Rate of compensation increase n/a n/a n/a n/a n/a n/a Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31 are as follows: Webster Pension Webster SERP Other Benefits 2015 2014 2013 2015 2014 2013 2015 2014 2013 Discount rate 3.85 % 4.80 % 3.90 % 3.50 % 4.25 % 3.40 % 3.15 % 3.75 % 2.85 % Expected long-term return on assets 7.00 % 7.25 % 7.50 % n/a n/a n/a n/a n/a n/a Rate of compensation increase n/a n/a n/a n/a n/a n/a n/a n/a n/a Assumed healthcare cost trend n/a n/a n/a n/a n/a n/a 8.0 % 8.0 % 8.0 % The assumed healthcare cost-trend rate is 8.0% for 2015 and 2016, declining 1.0% each year thereafter until 2019 when the rate will be 5.0% . An increase of 1.0% in the assumed healthcare cost-trend rate for 2015 would have increased the net periodic postretirement benefit cost by $6 thousand and increased the accumulated benefit obligation by $211 thousand . A decrease of 1.0% in the assumed healthcare cost trend rate for 2015 would have decreased the net periodic postretirement benefit cost by $6 thousand and decreased the accumulated benefit obligation by $190 thousand . Multiple-employer plan Webster Bank is a sponsor of a multiple-employer pension plan administered by Pentegra (the “Fund”) for the benefit of former employees of a bank acquired by Webster. The Fund does not segregate the assets or liabilities of its participating employers in the ongoing administration of this plan. According to the Fund’s administrators, as of July 1, 2015 , the date of the latest actuarial valuation, Webster’s portion of the plan was under-funded by $0.9 million . The following table sets forth contributions and funding status of the Fund: (In thousands) Contributions by Webster Bank Funded Status of Plan EIN/Pension Plan Number 2015 2014 2013 2015 2014 13-5645888/333 $340 $765 $870 At least 80 percent At least 80 percent Multi-employer accounting is applied to the Fund. As a multiple-employer plan, there are no collective bargained contracts affecting the Fund's contribution or benefit provisions. All shortfall amortization basis are being amortized over seven years, as required by the Pension Protection Act. All benefit accruals were frozen as of September 1, 2004. The Company's contributions to the Fund did not exceed more than 5 percent of total Fund contributions for the years ended December 31, 2015 , 2014 , and 2013 . Webster Bank Retirement Savings Plan Webster provides an employee retirement savings plan governed by section 401(k) of the Internal Revenue Code (the "Code”). For the period March 1, 2009 through February 1, 2012, Webster matched 100% of a participant’s pre-tax contributions to the extent the pre-tax contributions did not exceed 5% of compensation. If a participant fails to make a pre-tax contribution election within 90 days of his or her date of hire, automatic pre-tax contributions will commence 90 days after his or her date of hire at a rate equal to 3% of compensation. The 2% non-elective contribution has been eliminated; however, Webster continues to contribute the special transition credits. Effective February 1, 2012, Webster matches 100% of the first 2% and 50% of the next 6% of employees’ pre-tax contributions based on annual compensation. Webster continues to contribute the special transition credits under the employee retirement savings plan. Compensation and benefit expense included $10.9 million , $10.6 million , and $11.2 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively, for employer contributions.

Share-Based Plans

Share-Based Plans	12 Months Ended
Share-Based Plans	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Plans	Share-Based Plans Webster maintains stock compensation plans (collectively, the "Plans") under which non-qualified stock options, incentive stock options, restricted stock, restricted stock units, or stock appreciation rights may be granted to employees and directors. The Company believes these share awards better align the interests of its employees with those of its shareholders. Stock compensation cost is recognized over the required service vesting period for the awards, based on the grant-date fair value, net of estimated forfeitures, and is included as a component of compensation and benefits reflected in non-interest expense. The Plans have shareholder approval for up to 10.9 million shares of common stock. At December 31, 2015 , there were 1.3 million common shares remaining available for grant, while no stock appreciation rights have been granted. The following table provides a summary of stock compensation expense, and the related income tax benefit, recognized in the accompanying Consolidated Statements of Income: Years ended December 31, (In thousands) 2015 2014 2013 Stock options $ 379 $ 1,175 $ 3,902 Restricted stock 10,556 9,048 6,762 Total stock compensation expense $ 10,935 $ 10,223 $ 10,664 Income tax benefit $ 3,903 $ 3,553 $ 5,344 The following table provides a summary of unrecognized stock compensation expense: At December 31, 2015 (Dollars in thousands) Unrecognized Compensation Expense Weighted-Average Period To Be Recognized Stock options $ 43 0.1 years Restricted stock $ 10,937 1.9 years The following table provides a summary of the activity under the Plans for the year ended December 31, 2015 : Unvested Restricted Stock Awards Stock Options Outstanding Time-Based Performance-Based Number of Shares Weighted-Average Grant Date Fair Value Number of Units Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Exercise Price Balance at January 1, 2015 243,015 $ 27.03 2,279 $ 29.34 130,193 $ 28.61 1,900,144 $ 24.95 Granted 223,190 34.82 12,531 34.45 138,591 36.15 — — Exercised options — — — — — — (221,320 ) 18.09 Vested restricted stock awards (1) (220,866 ) 28.83 (12,722 ) 33.53 (153,063 ) 31.27 — — Forfeited (9,194 ) 30.27 — — — — (151,750 ) 45.36 Balance at December 31, 2015 236,145 $ 32.58 2,088 $ 34.45 115,721 $ 34.14 1,527,074 $ 23.92 Options exercisable, at December 31, 2015 1,420,758 $ 23.99 Options expected to vest, at December 31, 2015 105,378 $ 23.00 (1) Vested for purposes of recording compensation expense. Time-based restricted stock . Time-based restricted stock awards vest over the applicable service period ranging from one to five years. The Plans limit the number of time-based awards that may be granted to an eligible individual in a calendar year to 100,000 shares. Compensation expense is recorded over the vesting period based on fair value, which is measured using the Company's common stock closing price at the date of grant. Performance-based restricted stock . Performance-based restricted stock awards vest after a three year performance period, with share quantity dependent on that performance. Awards granted in 2015 and 2014 vest in a range from zero to 150% while previous awards vest in a range from zero to 200% of the target number of shares under the grant. The performance-based shares granted in 2015 vest, 50% based upon Webster's ranking for total shareholder return versus Webster's compensation peer group companies and 50% upon Webster's average of return on equity for each year during the three year vesting period. The compensation peer group companies are utilized because they represent the financial institutions that best compare with Webster. The Company records compensation expense over the vesting period, based on a fair value calculated using the Monte-Carlo simulation model, which allows for the incorporation of the performance condition for the 50% of the performance-based shares tied to total shareholder return versus the compensation peer group, and based on a fair value of the market price on the date of grant for the remaining 50% of the performance-based shares tied to Webster's return on equity. Compensation expense is subject to adjustment based on management's assessment of Webster's return on equity performance relative to the target number of shares condition. The total fair value of restricted stock awards vested during the years ended December 31, 2015 , 2014 , and 2013 was $11.6 million , $9.4 million , and $5.1 million , respectively. Stock options . Stock option awards have an exercise price equal to the market price of Webster's stock on the date of grant and vest over periods ranging from three to four years. Each option grants the holder the right to acquire a share of Webster common stock over a contractual life of up to ten years. There were no stock options granted for 2015 and 2014. The fair value of each option award for 2013 was $10.96 , as estimated on the date of grant using the Black-Scholes Option-Pricing Model using the following weighted-average assumptions: 6.9 years expected term; 1.80% expected dividend yield; 10.00% expected forfeiture rate; 58.97% expected volatility; and a 1.36% risk-free interest rate. The weighted-average remaining contractual term for options expected to vest at December 31, 2015 was 7.2 years . These assumptions can be highly subjective and therefore, Webster uses historical data within the valuation model. The expected term of options granted is derived from actual option exercise and employee termination tendencies. The expected dividend yield is based on the current annual dividend on a current stock price. The expected forfeiture rate is calculated based on actual forfeiture activity trends. The expected volatility is derived from historical returns of the daily closing stock price over periods of time equal to the duration of the expected term of options granted. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant for periods that coincide with the contractual life of the option. Aggregate intrinsic value represents the total pretax intrinsic value (the difference between Webster's closing stock price on the last trading day of the year and the weighted-average exercise price, multiplied by the number of shares) that would have been received by the option holders had all option holders exercised their options at that time. At December 31, 2015 , the aggregate intrinsic value of options outstanding, options exercisable, and options expected to vest was $22.5 million , $21.0 million , and $1.5 million , respectively. The total intrinsic value of options exercised during the years ended December 31, 2015 , 2014 , and 2013 was $4.3 million , $1.9 million , and $1.8 million , respectively. There were 1,388,957 non-qualified stock options and 138,117 incentive stock options outstanding at December 31, 2015 . The following table summarizes information about options outstanding and options exercisable at December 31, 2015 : Options Outstanding Options Exercisable Range of Exercise Prices Number of Shares Weighted-Average Remaining Contractual Life (years) Weighted-Average Exercise Price Number of Shares Weighted-Average Remaining Contractual Life (years) Weighted-Average Exercise Price $ 5.14 - 20.00 448,941 3.2 $ 9.67 448,941 3.2 $ 9.67 $ 20.01 - 30.00 672,339 6.1 23.54 566,023 5.9 23.65 $ 30.01 - 40.00 192,518 2.0 32.03 192,518 2.0 32.03 $ 40.01 - 48.88 213,276 1.0 47.77 213,276 1.0 47.77 1,527,074 4.0 $ 23.92 1,420,758 3.8 $ 23.99

Segment Reporting

Segment Reporting	12 Months Ended
Segment Reporting	Dec. 31, 2015
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting Beginning in January of 2015 , Webster’s operations are divided into four reportable segments that represent its core businesses – Commercial Banking, Community Banking, HSA Bank, and Private Banking. Community Banking includes the operating segments of Webster's Personal Banking and Business Banking. With the acquisition of a health savings account business in early 2015 , the reported revenue of the HSA Bank segment grew in excess of 10% of the combined revenue of all operating segments. As a result, beginning in the first quarter of 2015 . we began reporting the HSA Bank and Private Banking segments separately. These segments reflect how executive management responsibilities are assigned by the chief operating decision maker for each of the core businesses, the products and services provided, the type of customer served, and reflects how discrete financial information is currently evaluated. The Company’s Treasury unit and consumer liquidating portfolio are included in the Corporate and Reconciling category along with the amounts required to reconcile profitability metrics to GAAP reported amounts. The 2014 and 2013 segment results have been adjusted for comparability to the 2015 segment presentation. Webster’s reportable segment results are intended to reflect each segment as if it were a stand-alone business. Webster uses an internal profitability reporting system to generate information by operating segment, which is based on a series of management estimates and allocations regarding funds transfer pricing, provision for loan and lease losses, non-interest expense, income taxes, and equity capital. These estimates and allocations, certain of which are subjective in nature, are periodically reviewed and refined. Changes in estimates and allocations that affect the reported results of any operating segment do not affect the consolidated financial position or results of operations of Webster as a whole. The full profitability measurement reports, which are prepared for each operating segment, reflect non-GAAP reporting methodologies. The differences between full profitability and GAAP results are reconciled in the Corporate and Reconciling category. The Company uses a matched maturity funding concept, called funds transfer pricing (“FTP”), to allocate interest income and interest expense to each business while also transferring the primary interest rate risk exposures to the Corporate and Reconciling category. The allocation process considers the specific interest rate risk and liquidity risk of financial instruments and other assets and liabilities in each line of business. The matched maturity funding concept considers the origination date and the earlier of the maturity date or the repricing date of a financial instrument to assign an FTP rate for loans and deposits originated each day. Loans are assigned an FTP rate for funds used and deposits are assigned an FTP rate for funds provided. This process is executed by the Company’s Financial Planning and Analysis division and is overseen by the Company’s Asset/Liability Committee. Webster allocates the provision for loan and lease losses to each segment based on management’s estimate of the inherent loss content in each of the specific loan and lease portfolios. Provision expense for certain elements of risk that are not deemed specifically attributable to a reportable segment, such as the provision for the consumer liquidating portfolio, is shown as part of the Corporate and Reconciling category. Webster allocates a majority of non-interest expense to each reportable segment using a full-absorption costing process. Costs, including corporate overhead, are analyzed, pooled by process, and assigned to the appropriate reportable segment. Income tax expense is allocated to each reportable segment based on the consolidated effective income tax rate for the period shown. The following tables present the results for Webster’s reportable segments and the Corporate and Reconciling category, which incorporates the allocation of the provision for loan and lease losses and income tax expense: Year ended December 31, 2015 (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated Net interest income (loss) $ 255,845 $ 354,709 $ 73,433 $ 10,240 $ (29,602 ) $ 664,625 Provision (benefit) for loan and lease losses 30,160 19,603 — 386 (849 ) 49,300 Net interest income (loss) after provision for loan and lease losses 225,685 335,106 73,433 9,854 (28,753 ) 615,325 Non-interest income 37,784 108,604 64,243 9,183 19,731 239,545 Non-interest expense 109,718 330,692 80,662 19,781 13,701 554,554 Income (loss) before income tax expense 153,751 113,018 57,014 (744 ) (22,723 ) 300,316 Income tax expense (benefit) 48,112 35,366 17,841 (233 ) (7,110 ) 93,976 Net income (loss) $ 105,639 $ 77,652 $ 39,173 $ (511 ) $ (15,613 ) $ 206,340 Year ended December 31, 2014 (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated Net interest income (loss) $ 238,186 $ 354,781 $ 38,822 $ 8,877 $ (12,225 ) $ 628,441 Provision (benefit) for loan and lease losses 13,088 26,345 — 765 (2,948 ) 37,250 Net interest income (loss) after provision for loan and lease losses 225,098 328,436 38,822 8,112 (9,277 ) 591,191 Non-interest income 37,270 103,543 28,553 9,843 22,899 202,108 Non-interest expense 102,374 324,312 40,900 18,691 15,323 501,600 Income (loss) before income tax expense 159,994 107,667 26,475 (736 ) (1,701 ) 291,699 Income tax expense (benefit) 50,446 33,947 8,311 (232 ) (499 ) 91,973 Net income (loss) $ 109,548 $ 73,720 $ 18,164 $ (504 ) $ (1,202 ) $ 199,726 Year ended December 31, 2013 (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated Net interest income $ 217,582 $ 347,395 $ 32,807 $ 8,185 $ (9,241 ) $ 596,728 Provision (benefit) for loan and lease losses 17,971 19,219 — 397 (4,087 ) 33,500 Net interest income after provision for loan and lease losses 199,611 328,176 32,807 7,788 (5,154 ) 563,228 Non-interest income 30,797 116,182 21,963 10,963 11,145 191,050 Non-interest expense 99,801 337,795 29,962 19,783 10,368 497,709 Income before income tax expense 130,607 106,563 24,808 (1,032 ) (4,377 ) 256,569 Income tax expense 39,260 32,029 7,423 (310 ) (1,289 ) 77,113 Net income (loss) $ 91,347 $ 74,534 $ 17,385 $ (722 ) $ (3,088 ) $ 179,456 Total Assets (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated At December 31, 2015 $ 7,505,513 $ 8,441,950 $ 95,815 $ 493,571 $ 8,140,971 $ 24,677,820 At December 31, 2014 6,550,868 8,123,928 26,680 398,893 7,432,803 22,533,172 At December 31, 2013 5,682,129 7,738,597 19,524 346,338 7,066,557 20,853,145

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments Webster is obligated under various non-cancelable operating leases for properties used as banking and other office facilities. The leases contain renewal options and escalation clauses which provide for increased rental expense, or are for equipment upgrades. Rental expense under the leases was $21.5 million , $20.5 million , and $20.3 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively, and is recorded as a component of occupancy expense in the accompanying Consolidated Statements of Income. Rental income from sub-leases on certain of these properties is netted as a component of occupancy expense, while rental income under various non-cancelable operating leases for properties owned is recorded as a component of other non-interest income in the accompanying Consolidated Statements of Income. Rental income was $0.8 million for the years ended December 31, 2015 and 2014 , and $0.9 million for the year ended December 31, 2013 . The following table summarizes future minimum rental payments and receipts under lease agreements, including the greater Boston locations acquired through Citigroup Inc.: At December 31, 2015 (In thousands) Rental Payments Rental Receipts 2016 $ 25,218 $ 690 2017 23,140 422 2018 18,998 248 2019 17,227 147 2020 15,561 89 Thereafter 84,114 84 Total future minimum rental payments and receipts $ 184,258 $ 1,680 Credit-Related Financial Instruments The Company offers credit-related financial instruments, in the normal course of business to meet certain financing needs of its customers, that involve off-balance sheet risk. These transactions may include an unused commitment to extend credit, standby letter of credit, or commercial letter of credit. Such transactions involve, to varying degrees, elements of credit risk. The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk: At December 31, (In thousands) 2015 2014 Commitments to extend credit $ 4,851,994 $ 4,376,733 Standby letter of credit 133,294 142,964 Commercial letter of credit 45,742 27,787 Total credit-related financial instruments with off-balance sheet risk $ 5,031,030 $ 4,547,484 Commitments to Extend Credit . The Company makes commitments under various terms to lend funds to customers at a future point in time. These commitments include revolving credit arrangements, term loan commitments, and short-term borrowing agreements. Most of these loans have fixed expiration dates or other termination clauses where a fee may be required. Since commitments routinely expire without being funded, or after required availability of collateral occurs, the total commitment amount does not necessarily represent future liquidity requirements. Standby Letter of Credit . A standby letter of credit commits the Company to make payments on behalf of customers if certain specified future events occur. The Company has recourse against the customer for any amount required to be paid to a third party under a standby letter of credit, which is often part of a larger credit agreement under which security is provided. Historically, a large percentage of standby letters of credit expire without being funded. The contractual amount of a standby letter of credit represents the maximum amount of potential future payments the Company could be required to make, and is the Company's maximum credit risk. Commercial Letter of Credit . A commercial letter of credit is issued to facilitate either domestic or foreign trade arrangements for customers. As a general rule, drafts are committed to be drawn when the goods underlying the transaction are in transit. Similar to a standby letter of credit, a commercial letter of credit is often secured by an underlying security agreement including the assets or inventory they relate to. These commitments subject the Company to potential exposure in excess of amounts recorded in the financial statements, and therefore, management maintains a specific reserve for unfunded credit commitments. This reserve is reported as a component of accrued expenses and other liabilities in the accompanying Consolidated Balance Sheets. The following table provides a summary of activity in the reserve for unfunded credit commitments: Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 5,151 $ 4,384 $ 5,662 (Benefit) provision (3,032 ) 767 (1,278 ) Ending balance $ 2,119 $ 5,151 $ 4,384 The benefit recorded in 2015 to the reserve for unfunded credit commitments is the result of a change in a key assumption used in calculating expected incremental utilization of credit. The updated assumption is based on a more detailed analysis of customer behavior and performance in the months prior to a charge-off, rather than a general overall utilization rate, which should result in a better estimate of potential loss on credit-related financial instruments. Litigation Webster is involved in routine legal proceedings occurring in the ordinary course of business and is subject to loss contingencies related to such litigation and claims arising therefrom. Webster evaluates these contingencies based on information currently available, including advice of counsel and assessment of available insurance coverage. Webster establishes accruals for litigation and claims when a loss contingency is considered probable and the related amount is reasonably estimable. These accruals are periodically reviewed and may be adjusted as circumstances change. Webster also estimates certain loss contingencies for possible litigation and claims, whether or not there is an accrued probable loss. Webster believes it has defenses to all the claims asserted against it in existing litigation matters and intends to defend itself in all matters. Based upon its current knowledge, after consultation with counsel and after taking into consideration its current litigation accruals, Webster believes that at December 31, 2015 any reasonably possible losses, in addition to amounts accrued, are not material to Webster’s consolidated financial condition. However, in light of the uncertainties involved in such actions and proceedings, there is no assurance that the ultimate resolution of these matters will not significantly exceed the amounts currently accrued by Webster or that the Company’s litigation accrual will not need to be adjusted in future periods. Such an outcome could be material to the Company’s operating results in a particular period, depending on, among other factors, the size of the loss or liability imposed and the level of the Company’s income for that period.

Parent Company Information

Parent Company Information	12 Months Ended
Parent Company Information	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Information	Parent Company Information Financial information for the Parent Company only is presented in the following tables: Condensed Balance Sheets December 31, (In thousands) 2015 2014 Assets: Cash and due from banks $ 279,644 $ 272,492 Securities available for sale, at fair value 2,578 5,902 Investment in subsidiaries 2,347,068 2,249,910 Due to subsidiaries (48 ) (165 ) Alternative investments 6,795 10,046 Other assets 16,359 14,356 Total assets $ 2,652,396 $ 2,552,541 Liabilities and shareholders’ equity: Senior notes $ 149,036 $ 148,917 Junior subordinated debt 77,320 77,320 Accrued interest payable 2,591 2,582 Other liabilities 7,878 907 Total liabilities 236,825 229,726 Shareholders’ equity 2,415,571 2,322,815 Total liabilities and shareholders’ equity $ 2,652,396 $ 2,552,541 Condensed Statements of Income Years ended December 31, (In thousands) 2015 2014 2013 Operating Income: Dividend income from bank subsidiary $ 110,000 $ 100,000 $ 90,000 Interest on securities and interest-bearing deposits 546 613 1,025 Gain on sale of investment securities, net — 1,185 1,273 Alternative investments income (loss) 2,274 804 (392 ) Other non-interest income 152 151 152 Total operating income 112,972 102,753 92,058 Operating Expense: Interest expense on borrowings 9,665 10,041 7,273 Compensation and benefits 10,965 10,290 10,787 Other non-interest expense 6,005 4,562 5,966 Total operating expense 26,635 24,893 24,026 Income before income tax benefit and equity in undistributed earnings of subsidiaries and associated companies 86,337 77,860 68,032 Income tax benefit 2,929 8,798 9,742 Equity in undistributed earnings of subsidiaries and associated companies 117,074 113,068 101,682 Net income $ 206,340 $ 199,726 $ 179,456 Condensed Statements of Comprehensive Income Years ended December 31, (In thousands) 2015 2014 2013 Net income $ 206,340 $ 199,726 $ 179,456 Other comprehensive loss, net of tax: Net unrealized (losses) gains on available for sale securities (2,109 ) 725 (616 ) Net unrealized gains (losses) on derivative instruments 1,223 (2,932 ) 1,152 Other comprehensive loss of subsidiaries and associated companies (20,959 ) (5,505 ) (16,819 ) Other comprehensive loss, net of tax (21,845 ) (7,712 ) (16,283 ) Comprehensive income $ 184,495 $ 192,014 $ 163,173 Condensed Statements of Cash Flows Years ended December 31, (In thousands) 2015 2014 2013 Operating activities: Net income $ 206,340 $ 199,726 $ 179,456 Adjustments to reconcile income from continuing operations to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries and associated companies (117,074 ) (113,068 ) (101,682 ) Stock-based compensation 10,935 10,223 10,664 Other, net 9,066 (10,721 ) (1,934 ) Net cash provided by operating activities 109,267 86,160 86,504 Investing activities: Purchases of available for sale securities — (3,500 ) (75 ) Proceeds from sale of available for sale securities — 3,499 13,544 Net cash (used for) provided by investing activities — (1 ) 13,469 Financing activities: Issuance of long-term debt — 150,000 — Repayment of long-term debt — (150,000 ) — Cash dividends paid to common shareholders (80,964 ) (67,431 ) (48,952 ) Cash dividends paid to preferred shareholders (8,711 ) (10,556 ) (10,803 ) Exercise of stock options 3,060 2,221 2,736 Excess tax benefits from stock-based compensation 2,338 1,161 389 Common stock issued — 435 731 Common stock repurchased/shares acquired related to employee share-based plans (17,815 ) (13,067 ) (672 ) Common stock warrants repurchased (23 ) (3 ) (30 ) Net cash used for financing activities (102,115 ) (87,240 ) (56,601 ) Increase (decrease) in cash and due from banks 7,152 (1,081 ) 43,372 Cash and due from banks at beginning of year 272,492 273,573 230,201 Cash and due from banks at end of year $ 279,644 $ 272,492 $ 273,573

Selected Quarterly Consolidated

Selected Quarterly Consolidated Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Selected Quarterly Consolidated Financial Information (Unaudited)	Selected Quarterly Consolidated Financial Information (Unaudited) 2015 (In thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Interest income $ 182,912 $ 186,970 $ 191,998 $ 198,160 Interest expense 23,148 23,459 23,988 24,820 Net interest income 159,764 163,511 168,010 173,340 Provision for loan and lease losses 9,750 12,750 13,000 13,800 Non-interest income (less securities amounts) 57,847 59,365 61,537 60,297 Gain on sale of investment securities, net 43 486 — 80 Impairment loss recognized in earnings — — (82 ) (28 ) Non-interest expense 134,090 137,446 139,854 143,164 Income before income tax expense 73,814 73,166 76,611 76,725 Income tax expense 24,092 20,663 25,075 24,146 Net income $ 49,722 $ 52,503 $ 51,536 $ 52,579 Earnings applicable to common shareholders $ 46,937 $ 50,277 $ 49,341 $ 50,414 Earnings per common share: Basic $ 0.52 $ 0.55 $ 0.54 $ 0.55 Diluted 0.52 0.55 0.54 0.55 2014 (In thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Interest income $ 177,779 $ 177,497 $ 179,914 $ 183,751 Interest expense 22,478 22,375 22,544 23,103 Net interest income 155,301 155,122 157,370 160,648 Provision for loan and lease losses 9,000 9,250 9,500 9,500 Non-interest income (less securities amounts) 45,580 47,669 50,952 53,553 Gain on sale of investment securities, net 4,336 — 42 1,121 Impairment loss recognized in earnings (88 ) (73 ) (85 ) (899 ) Non-interest expense 124,463 122,475 124,498 130,164 Income before income tax expense 71,666 70,993 74,281 74,759 Income tax expense 21,237 23,159 23,824 23,753 Net income $ 50,429 $ 47,834 $ 50,457 $ 51,006 Earnings applicable to common shareholders $ 47,617 $ 45,008 $ 47,647 $ 48,224 Earnings per common share: Basic $ 0.53 $ 0.50 $ 0.53 $ 0.54 Diluted 0.53 0.50 0.53 0.53

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of Webster Financial Corporation and all other entities in which it has a controlling financial interest. Intercompany accounts and transactions have been eliminated in consolidation. Webster's accounting and financial reporting policies conform, in all material respects, to U.S. Generally Accepted Accounting Principles (“GAAP”) and to general practices within the financial services industry. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on net income, comprehensive income, total assets, total liabilities, total shareholders' equity, net cash provided by operating activities, net cash used for investing activities, and net cash provided by financing activities. Assets that the Company holds or manages in a fiduciary or agency capacity for customers, typically referred to as assets under administration or assets under management are not included in the accompanying Consolidated Balance Sheets since those assets are not Webster's, and the Company is not the primary beneficiary.
Variable Interest Entities	Variable Interest Entities. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a Variable Interest Entity (“VIE”) under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holder with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company consolidates VIEs in which it has at least a majority of the voting interest. VIEs are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE's economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company owns the common stock of a trust which has issued trust preferred securities. The trust is a VIE in which the Company is not the primary beneficiary and therefore, is not consolidated. The trust's only assets are junior subordinated debentures issued by the Company, which were acquired by the trust using the proceeds from the issuance of the trust preferred securities and common stock. The junior subordinated debentures are included in long-term debt and the Company’s equity interest in the trust is included in other assets in the accompanying Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported in interest expense on long-term debt in the accompanying Consolidated Statements of Income.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of these consolidated financial statements. The allowance for loan and lease losses, the fair value measurements of financial instruments, the valuation of investments for other-than-temporary impairment, the goodwill and intangible assets valuation, income taxes, the, as well as the status of contingencies, are particularly subject to change. Actual results could differ from those estimates.
Acquisition	Acquisition On January 13, 2015 (the "acquisition date"), Webster Bank completed its acquisition of the health savings account business of JPMorgan Chase Bank, N.A. The results of the acquisition have been included in the financial statements from the acquisition date.
Cash Equivalents	Cash Equivalents Cash equivalents have a maturity of three months or less. Cash and due from banks. Cash equivalents, including cash on hand, certain cash due from banks, and deposits at the Federal Reserve Banks, are referenced as cash and due from banks in the accompanying Consolidated Balance Sheets and Consolidated Statements of Cash Flows. Interest-bearing deposits. Cash equivalents, primarily representing deposits at the Federal Reserve Banks in excess of reserve requirements, and federal funds sold, which essentially represent uncollateralized loans to other financial institutions, are referenced as interest-bearing deposits in the accompanying Consolidated Balance Sheets and Consolidated Statements of Cash Flows. The Company regularly evaluates the credit risk associated with those financial institutions to assess that Webster is not exposed to any significant credit risk on cash equivalents.
Investment Securities	Investment Securities Investment securities are classified as available-for-sale ("AFS") or held-to-maturity ("HTM") at the time of purchase. Any subsequent change to classification is reviewed for compliance with corporate objectives and accounting policy. Debt securities classified as HTM are those which Webster has the ability and intent to hold to maturity. Securities classified as HTM are recorded at amortized cost net of unamortized premiums and discounts. Discount accretion income and premium amortization expense are recognized as interest income according to a constant yield methodology, with consideration given to prepayment assumptions on mortgage backed securities. Securities classified as AFS are recorded at fair value with unrealized gains and losses recorded as a component of other comprehensive income (“OCI”). Securities transferred from AFS to HTM are recorded at fair value at the time of transfer, and the respective gain or loss is recorded as a separate component of OCI and amortized as an adjustment to interest income over the remaining life of the security. All securities classified as AFS or HTM that are in an unrealized loss position are evaluated for other-than-temporary impairment ("OTTI") on a quarterly basis. The evaluation considers several qualitative factors, including the period of time the security has been in a loss position, and the amount of the unrealized loss. If the Company intends to sell the security or it is more than likely the Company will be required to sell the security prior to recovery of its amortized cost basis, the security is written down to fair value, and the loss is recognized in non-interest income in the accompanying Consolidated Statements of Income. If the Company does not intend to sell the security and it is more likely than not that the Company will not be required to sell the security prior to recovery of its amortized cost basis, only the credit component of the unrealized loss is recorded as an impairment charge to a debt security and recognized as a loss. The remaining loss component would be recorded to accumulated other comprehensive loss in the accompanying Consolidated Balance Sheets. The entire amount of an unrealized loss position of an equity security that is considered OTTI is recorded as an impairment loss in non-interest income in the accompanying Consolidated Statements of Income. The specific identification method is used to determine realized gains and losses on sales of securities.
Loans Held for Sale	Loans Held for Sale Residential mortgage loans typically are classified as held for sale upon origination based on management's intent to sell such loans. For loans not previously held for sale, once a decision has been made to sell loans, such loans shall be transferred into the loans held for sale classification. The majority of loans held for sale are residential mortgage loans. Loans held for sale are carried at the lower of cost or fair value and are valued on an individual asset basis. Any cost amount in excess of fair value is recorded as a valuation allowance and recognized as a reduction of other income in the Consolidated Statements of Income. Gains or losses on the sale of loans held for sale are recorded as non-interest income. Direct loan origination costs and fees are deferred and recognized as part of the gain or loss at the time of sale. Cash flows from sale of loans made by the Company that were acquired specifically for resale are presented as operating cash flows. All other cash flows from sale of loans are presented as investing cash flows.
Transfers and Servicing of Financial Assets	Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is generally considered to have been surrendered when: (i) the transferred assets are legally isolated from the Company or its consolidated affiliates, even in bankruptcy or other receivership; (ii) the transferee has the right to pledge or exchange the assets with no conditions that constrain the transferee and provide more than a trivial benefit to the Company; and (iii) the Company does not maintain the obligation or unilateral ability to reclaim or repurchase the assets. The Company sells financial assets in the normal course of business, the majority of which are residential mortgage loan sales primarily to government-sponsored enterprises through established programs, commercial loan sales through participation agreements, and other individual or portfolio loan and securities sales. In accordance with accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. With the exception of servicing and certain performance-based guarantees, the Company’s continuing involvement with financial assets sold is minimal and generally limited to market customary representation and warranty clauses covering certain characteristics of the mortgage loans sold and the Company's origination process. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets, the consideration received, and any liabilities incurred in exchange for the transferred assets. When the Company sells financial assets, it may retain servicing rights and/or other interests in the financial assets. Servicing assets and any other interests held by the Company are recorded at fair value upon transfer, and thereafter are carried at the lower of cost or fair value.
Loans and Leases	Loans and Leases Loans and leases are stated at the principal amount outstanding, net of amounts charged off, unamortized premiums and discounts, and deferred loan and lease fees/costs which are recognized as yield adjustments using the interest method. These yield adjustments are amortized over the contractual life of the related loans and leases adjusted for estimated prepayments when applicable. Interest on loans and leases is credited to interest income as earned based on the interest rate applied to principal amounts outstanding. Cash flows from loans and leases are presented as investing cash flows. Loans and leases are placed on non-accrual status when collection of principal and interest in accordance with contractual terms is doubtful, generally when principal or interest payments become 90 days delinquent, unless the loan or lease is well secured and in process of collection, or sooner if management concludes circumstances indicate that the borrower may be unable to meet contractual principal or interest payments. Residential real estate loans, excluding loans fully insured against loss and in the process of collection, and consumer loans are placed on non-accrual status at 90 days past due, or at the date when the Company is notified that the borrower is discharged in bankruptcy. A charge-off is recorded at 180 days if the loan balance exceeds the fair value of the collateral less costs to sell. Residential loans that are more than 90 days past due, fully insured against loss, and in the process of collection, remain accruing and are reported as 90 days or more past due and accruing. Commercial, commercial real estate loans, and equipment finance loans or leases are subject to a detailed review when 90 days past due to determine accrual status, or when payment is uncertain and a specific consideration is made to put a loan or lease on non-accrual status. When loans and leases are placed on non-accrual status, the accrual of interest is discontinued, and any unpaid accrued interest is reversed and charged against interest income. If ultimate repayment of a non-accrual loan or lease is expected, any payments received are applied in accordance with contractual terms. If ultimate repayment is not expected on commercial, commercial real estate, and equipment finance loans and leases, any payment received on a non-accrual loan or lease is applied to principal until the unpaid balance has been fully recovered. Any excess is then credited to interest income when received. If the Company determines, through a current valuation analysis, that principal can be repaid on residential real estate and consumer loans, interest payments may be taken into income as received on a cash basis. Except for loans discharged under Chapter 7 of the Bankruptcy Code, loans are removed from non-accrual status when they become current as to principal and interest or demonstrate a period of performance under contractual terms and, in the opinion of management, are fully collectible as to principal and interest. Pursuant to regulatory guidance, a Chapter 7 discharged bankruptcy loan is removed from non-accrual status when the bank expects full repayment of the remaining pre-discharged contractual principal and interest, the loan is a closed-end amortizing loan, it is fully collateralized, and post-discharge the loan had at least six consecutive months of current payments.
Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments	Allowance for Loan and Lease Losses The allowance for loan and lease losses ("ALLL") is a reserve established through a provision for loan and lease losses charged to expense and represents management’s best estimate of probable losses that may be incurred within the existing loan and lease portfolio as of the balance sheet date. The level of the allowance reflects management’s view of trends in losses, current portfolio quality, and present economic, political, and regulatory conditions. Portions of the allowance may be allocated for specific loans and leases; however, the entire allowance is available for any loan or lease that is charged off. A charge-off is recorded on a case-by-case basis when all or a portion of the loan or lease is deemed to be uncollectible. Back-testing is performed to compare original estimated losses and actual observed losses, resulting in ongoing refinements. While management utilizes its best judgment based on the information available at the time, the ultimate adequacy of the allowance is dependent upon a variety of factors that are beyond the Company’s control, which include the performance of the Company’s portfolio, economic conditions, interest rate sensitivity, and the view of the regulatory authorities regarding loan classifications. The ALLL consists of the following three elements: (i) specific valuation allowances established for probable losses on impaired loans and leases; (ii) quantitative valuation allowances calculated using loss experience for like loans and leases with similar characteristics and trends, adjusted, as necessary, to reflect the impact of current conditions; and (iii) qualitative factors determined based on general economic conditions and other factors that may be internal or external to the Company. Loans and leases are considered impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due in accordance with the original contractual terms of the loan agreement, including scheduled principal and interest payments. Impairment is evaluated on a pooled basis for smaller-balance homogeneous residential and consumer loans. Commercial, commercial real estate, and equipment financing loans and leases over a specific dollar amount and all troubled debt restructurings ("TDR") are evaluated individually for impairment. A loan identified as a TDR is considered an impaired loan for the entire term of the loan, with few exceptions. If a loan is impaired, a specific valuation allowance may be established, and the loan is reported net, at the present value of estimated future cash flows using the loan’s original interest rate or at the fair value of collateral less cost to sell if repayment is expected from collateral liquidation. Interest payments on non-accruing impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis. Impaired loans, or portions thereof, are charged off when deemed uncollectible. Factors considered by management in determining impairment include payment status, collateral value, discharged bankruptcy, and the likelihood of collecting scheduled principal and interest payments. Consumer modified loans are analyzed for re-default probability, which is considered when determining the impaired reserve for ALLL. The current or weighted-average (for multiple notes within a commercial borrowing arrangement) interest rate of the loan is used as the discount rate when the interest rate floats with a specified index. A change in terms or payments would be included in the impairment calculation. See Note 4: Loans and Leases for further information. Reserve for Unfunded Commitments The reserve for unfunded commitments provides for probable losses inherent with funding the unused portion of legal commitments to lend. The unfunded reserve calculation includes factors that are consistent with ALLL methodology for funded loans using the loss given default, probability of default, and a draw down factor applied to the underlying borrower risk and facility grades. The reserve for unfunded credit commitments is included within other liabilities in the accompanying Consolidated Balance Sheets, and changes in the reserve are reported as a component of other expense in the accompanying Consolidated Statements of Income.
Troubled Debt Restructurings	Troubled Debt Restructurings A modified loan is considered a TDR when the following two conditions are met: (i) the borrower is experiencing financial difficulties; and (ii) the modification constitutes a concession. The Company considers all aspects of the restructuring in determining whether a concession has been granted, including the debtor's ability to access funds at a market rate. In general, a concession exists when the modified terms of the loan are more attractive to the borrower than standard market terms. Modified terms are dependent upon the financial position and needs of the individual borrower. The most common types of modifications include covenant modifications and forbearance. Loans for which the borrower has been discharged under Chapter 7 bankruptcy are considered collateral dependent TDRs, impaired at the date of discharge, and charged down to the fair value of collateral less cost to sell, if management considers that loss potential likely exists. The Company’s policy is to place consumer loan TDRs, except those that were performing prior to TDR status, on non-accrual status for a minimum period of six months . Commercial TDRs are evaluated on a case-by-case basis for determination of whether or not to place them on non-accrual status. Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months . Initially, all TDRs are reported as impaired. Generally, TDRs are classified as impaired loans and reported as TDRs for the remaining life of the loan. Impaired and TDR classification may be removed if the borrower demonstrates compliance with the modified terms for a minimum of six months and through a fiscal year-end and the restructuring agreement specifies a market rate of interest equal to that which would be provided to a borrower with similar credit at the time of restructuring. In the limited circumstance that a loan is removed from TDR classification, it is the Company’s policy to continue to base its measure of loan impairment on the contractual terms specified by the loan agreement. The Company’s loan and lease portfolio includes loans that have been restructured into an A-Note/B-Note structure as a result of evaluating the cash flow of the borrowers to support repayment. Webster immediately charged off the balances of the B-Notes. The restructuring agreements specify a market interest rate equal to that which would be provided to a borrower with similar credit at the time of restructuring.
Foreclosed and Repossessed Assets	Foreclosed and Repossessed Assets Real estate acquired through foreclosure (“OREO”) or other assets acquired through repossession are carried at the lower of cost or market value less estimated selling costs and are included within other assets in the accompanying Consolidated Balance Sheets. Independent appraisals generally are obtained to substantiate fair value and may be subject to adjustment based upon historical experience or specific geographic trends impacting the property. Within 90 days of a loan being foreclosed upon, the excess of loan balance over fair value less cost to sell is charged off against the allowance for loan and lease losses. Subsequent write-downs in value, maintenance costs as incurred, and gains or losses upon sale are charged to non-interest expense in the accompanying Consolidated Statements of Income.
Premises and Equipment	Premises and Equipment Premises and equipment are carried at cost, less accumulated depreciation. Depreciation of premises and equipment is computed on a straight-line basis over the estimated useful lives of the assets, as follows: Building and Improvements 5 - 40 years Leasehold improvements 5 - 20 years (or term or lease, if shorter) Fixtures and equipment 5 - 10 years Data processing and software 3 - 7 years Repairs and maintenance costs are charged to non-interest expense as incurred. Premises and equipment being actively marketed for sale are reclassified as assets held for disposition. The cost and accumulated depreciation relating to premises and equipment retired or otherwise disposed of are eliminated, and any resulting losses are charged to non-interest expense.
Goodwill	Goodwill Goodwill represents the excess purchase price of businesses acquired over the fair value of the identifiable net assets acquired and is assigned to specific reporting units. Goodwill is not subject to amortization but rather is evaluated for impairment annually, or more frequently in interim periods if events occur or circumstances change indicating it would more likely than not result in a reduction of the fair value of a reporting unit below its carrying value. Goodwill is evaluated for impairment by either performing a qualitative evaluation or a two-step quantitative test. The qualitative evaluation is an assessment of factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. The Company utilizes an equally weighted combined income and market approach to arrive at an indicated fair value range for the reporting unit. In “Step 1,” the fair value of a reporting unit is compared to its carrying amount, including goodwill, to ascertain if a goodwill impairment exists. If the fair value of the reporting unit exceeds its carrying amount, goodwill of the reporting unit is not considered impaired, and it is not necessary to continue to “Step 2” of the impairment process. Otherwise, Step 2 is performed where the implied fair value of goodwill is compared to the carrying value of goodwill in the reporting unit. If a reporting unit's carrying value exceeds fair value, the difference is charged to non-interest expense.
Other Intangible Assets	Other Intangible Assets Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights, or because the asset is capable of being sold or exchanged either separately or in combination with a related contract, asset, or liability. Other intangible assets with finite useful lives are amortized to non-interest expense over their estimated useful lives and are evaluated for impairment whenever events occur or circumstances change indicating the carrying amount of the asset may not be recoverable. Core deposit intangibles resulting from the health savings account acquisition are amortized on an accelerated basis over their estimated useful lives. Core deposit intangibles existing prior to the health savings account acquisition continue to be amortized on a straight line basis over their remaining estimated useful lives. Intangible assets relating to customer relationships are amortized on a straight line basis over their estimated useful lives.
Cash Surrender Value of Life Insurance	Cash Surrender Value of Life Insurance The investment in life insurance represents the cash surrender value of life insurance policies on certain current and former officers of Webster. Increases in the cash surrender value are recorded as non-interest income. Decreases are the result of collection on the policies due to the death of an insured. Death benefit proceeds in excess of cash surrender value are recorded in other non-interest income when realized.
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase These agreements are accounted for as secured financing transactions since Webster maintains effective control over the transferred securities and the transfer meets the other criteria for such accounting. Obligations to repurchase securities sold are reflected as a liability in the accompanying Consolidated Balance Sheets. The securities underlying the agreements are delivered to a custodial account for the benefit of the dealer or bank with whom each transaction is executed. The dealers or banks, which may sell, loan, or otherwise hypothecate such securities to other parties in the normal course of their operations, agree to resell to Webster the same securities at the maturity date of the agreements. The securities underlying the agreements with Bank customers are pledged; however, the customer does not have ability to hypothecate the underlying securities.
Share-based Compensation	Share-Based Compensation Webster maintains an equity incentive plan under which non-qualified stock options, incentive stock options, restricted stock, restricted stock units, or stock appreciation rights may be granted to employees and directors. Share awards are issued from available treasury shares. Stock-based compensation cost is recognized over the requisite service period for the awards, based on the grant-date fair value, net of estimated forfeitures, and is reported as a component of compensation and benefits expense. All awards are subject to a minimum one -year service vesting period. For stock option awards the Black-Scholes Option-Pricing Model is used to measure fair value at the date of grant. For time-based restricted stock and restricted stock unit awards, fair value is measured using the Company's common stock closing price at the date of grant. The Company grants performance-based restricted stock awards that vest after a three year performance period. Awards granted in 2015 and 2014 vest in a range from zero to 150% while awards granted prior to 2014 vest in a range from zero to 200% of the target number of shares under the grant. The Company records compensation expense over the vesting period, based on a fair value. Compensation expense is subject to adjustment based on management's assessment of Webster's return on equity performance relative to the target number of shares condition. Dividends are accrued on the performance-based shares and paid when the performance target is met. See Note 18: Share-Based Plans for further information. Excess tax benefits result when tax return deductions exceed recognized compensation cost determined using the grant-date fair value approach for financial statement purposes. Excess tax benefits are presented as a cash inflow from financing activities and a cash outflow from operating activities.
Income Taxes	Income Taxes Income tax expense, or benefit, is comprised of two components, current and deferred. The current component reflects taxes payable or refundable for a current period based on applicable tax laws, and the deferred component represents the tax effects of temporary differences between amounts recognized for financial accounting and tax purposes. Deferred tax assets and liabilities reflect the tax effects of such differences that are anticipated to result in taxable or deductible amounts in the future, when the temporary differences reverse. Deferred tax assets are recognized if it is more likely than not they will be realized, and may be reduced by a valuation allowance if it is more likely than not that all or some portion will not be realized. Tax positions that are uncertain but meet a more likely than not recognition threshold are initially and subsequently measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position meets the more likely than not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management's judgment. Webster recognizes interest expense and penalties on uncertain tax positions as a component of income tax expense and recognizes interest income on refundable income taxes as a component of other non-interest income.
Earnings Per Common Share	Earnings Per Common Share Earnings per common share is computed under the two-class method. Basic earnings per common share is computed by dividing earnings allocated to common shareholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding non-participating securities. Non-vested restricted stock awards are participating securities as they have non-forfeitable rights to dividends or dividend equivalents. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation and warrants for common stock using the treasury stock method. A reconciliation of the weighted-average shares used in calculating basic earnings per common share and the weighted-average common shares used in calculating diluted earnings per common share is provided in Note 14: Earnings Per Common Share .
Comprehensive Income	Comprehensive Income Comprehensive income includes all changes in shareholders’ equity during a period, except those resulting from transactions with shareholders. In addition to net income, Webster's components of other comprehensive income consists of the after-tax effect of changes in net unrealized gain/loss on securities available for sale, changes in net unrealized gain/loss on derivative instruments, and changes in net actuarial gain/loss and prior service cost for defined benefit pension and other postretirement benefit plans. Comprehensive income is reported in the accompanying Consolidated Statements of Shareholders' Equity, Consolidated Statements of Comprehensive Income, and Note 12: Accumulated Other Comprehensive Loss, Net of Tax .
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities Derivatives are recognized as assets and liabilities in the accompanying Consolidated Balance Sheets and measured at fair value. For exchange-traded contracts, fair value is based on quoted market prices. For non-exchange traded contracts, fair value is based on dealer quotes, pricing models, discounted cash flow methodologies, or similar techniques for which the determination of fair value may require management judgment or estimation, relating to future rates and credit activities. Interest Rate Swap Agreements. For asset/liability management purposes, the Company uses interest rate swap agreements to hedge various exposures or to modify interest rate characteristics of various balance sheet accounts. Interest rate swaps are contracts in which a series of interest rate flows are exchanged over a prescribed period of time. The notional amount on which the interest payments are based is not exchanged. These swap agreements are derivative instruments and generally convert a portion of the Company’s variable-rate debt to a fixed-rate (cash flow hedge), or convert a portion of its fixed-rate debt to a variable-rate (fair value hedge). Webster uses forward-settle interest rate swaps to protect the Company against adverse fluctuations in interest rates by reducing its exposure to variability in cash flows relating to interest payments on forecasted debt issuances. Forward-settle swaps typically have a future effective date that coincides with the expected debt issuance date. The forward-settle swaps are typically terminated and cash settled upon hedge debt issuance date. The gain or loss on a derivative designated and qualifying as a fair value hedging instrument, as well as the offsetting gain or loss on the hedged item attributable to the risk being hedged, is recognized currently in earnings in the same accounting period. The effective portion of the gain or loss on a derivative designated and qualifying as a cash flow hedging instrument is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument, if any, is recognized in non-interest income. Interest rate derivative financial instruments receive hedge accounting treatment only if they are qualified and properly designated as hedges and are expected to be, and are, effective in substantially reducing interest rate risk arising from specifically identified assets and liabilities. A hedging instrument is expected at inception to be highly effective at offsetting changes in the hedged transactions attributable to the changes in the hedged risk. The Company expects that the hedging relationship will be highly effective; however, it does not assume there is no ineffectiveness. The Company performs quarterly prospective and retrospective assessments of the hedge effectiveness to ensure the hedging relationship continues to be highly effective and that hedge accounting can continue to be applied. Those derivative financial instruments that do not meet specified hedging criteria are recorded at fair value with changes in fair value recorded in income. Cash flows from derivative financial instruments designated for hedge accounting are classified in the cash flow statement in the same category as the cash flows of the asset or liability being hedged. Derivative Loan Commitments. Mortgage loan commitments related to the origination of mortgages that will be held for sale upon funding are considered derivative instruments. Loan commitments that are derivatives are recognized at fair value on the Consolidated Balance Sheets in other assets and other liabilities with changes in their fair values recorded in non-interest income. Counterparty Credit Risk. The Company's exposures with the majority of its approved financial institution counterparties are fully cash collateralized. In accordance with Webster policies, institutional counterparties must be fully underwritten and approved through the Company’s credit approval process. The Company’s credit exposure on interest rate swaps is limited to the net favorable value and interest payments of all swaps by each of the counterparties. Credit exposure may be reduced by the amount of collateral pledged by the counterparty. The Company evaluates the credit risk of its counterparties, taking into account such factors as the likelihood of default, its net exposures, and remaining contractual life, among other things, in determining if any adjustments related to credit risk are required.
Fair Value Measurements	Fair Value Measurements The Company measures many of its assets and liabilities on a fair value basis, in accordance with Accounting Standards Codification Topic 820, "Fair Value Measurement." Fair value is used on a recurring basis for certain assets and liabilities in which fair value is the primary basis of accounting. Examples of these include derivative instruments and AFS securities. Additionally, fair value is used on a non-recurring basis to evaluate assets or liabilities for impairment. Examples of these include impaired loans and leases, mortgage servicing assets, long-lived assets, goodwill, and loans held for sale, which are accounted for at the lower of cost or fair value. Further information regarding the Company's policies and methodology used to measure fair value is presented in Note 16: Fair Value Measurements .
Employee Retirement Benefit Plan	Employee Retirement Benefit Plan Webster Bank maintains a noncontributory defined benefit pension plan covering all employees that were participants on or before December 31, 2007. Costs related to this qualified plan, based upon actuarial computations of current and future benefits for eligible employees, are charged to non-interest expense and are funded in accordance with the requirements of the Employee Retirement Income Security Act. A supplemental retirement plan is also maintained for select executive level employees that were participants on or before December 31, 2007. Webster also provides postretirement healthcare benefits to certain retired employees.
Fee Revenue	Fee Revenue Generally, fee revenue from deposit service charges and loans is recorded when earned, except where ultimate collection is uncertain, in which case revenue is recognized as received. Trust revenue is recorded as earned on individual accounts based upon a percentage of asset value. Fee income on managed institutional accounts is recognized as earned and collected quarterly based on the quarter-end value of assets managed.
Marketing Costs	Marketing Costs Marketing costs are expensed as incurred over the projected benefit period.
Recently Adopted and Issued Accounting Standards Updates	Recently Adopted Accounting Standards Updates Effective January 1, 2015 , the following new accounting guidance was adopted by the Company: • Accounting Standards Update ("ASU") No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323) - Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force); • ASU No. 2014-04, Receivables, Troubled Debt Restructurings by Creditors (Subtopic 310-40) - Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force); • ASU No. 2014-11, Transfers and Servicing (Topic 860) - Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures; and • ASU No. 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40) - Classification of Certain Government-Guaranteed Residential Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force). The adoption of these accounting standards did not have a material impact on the Company's financial statements. Recently Issued Accounting Standards Updates The following table identifies ASUs applicable to the Company that have been issued by the FASB but are not yet effective: ASU Description Effective Date and Financial Statement Impact ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10) - "Recognition and Measurement of Financial Assets and Financial Liabilities." Equity investments not accounted for under the equity method or those that do not result in consolidation of the investee are to be measured at fair value with changes in the fair value recognized through net income. Entities are to present separately in other comprehensive income, the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when an election to measure the liability at fair value in accordance with the fair value option for financial instruments has been made. Also, the requirement to disclose the method(s) and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the balance sheet has been eliminated. The Company intends to adopt the Update for the first quarter of 2018 and is in the process of assessing the impact on its financial statements. ASU No. 2015-16, Business Combinations (Topic 805) - "Simplifying the Accounting for Measurement - Period Adjustments." Accounting for adjustments made to provisional amounts recognized in a business combination is simplified. First, the acquirer must recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amount is determined, and record in that period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. Second, adjustments to provisional amounts that are identified after December 15, 2015 and that are within the measurement period should be applied prospectively. Upon transition, an entity would be required to disclose the nature of, and reason for, the change in accounting principle. An entity would provide that disclosure in the first annual period of adoption and in the interim periods within the first annual period. The Update is effective beginning January 1, 2016 and will not have a material impact on the Company's financial statements. ASU No. 2015-07, Fair Value Measurement (Topic 820) - "Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent) (a consensus of the FASB Emerging Issues Task Force)." The requirement to categorize within the fair value hierarchy all investments for which fair value is measured using net asset value per share as a practical expedient has been removed. Additional requirements to make certain disclosures has been modified to apply to, rather than all investments that are eligible to be, only those investments that an entity has elected to be measured at fair value using net asset value per share as a practical expedient. An entity should apply the guidance on a retrospective basis. The Update is effective beginning January 1, 2016 and will not have a material impact on the Company's financial statements. ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30) - "Simplifying the Presentation of Debt Issuance Costs." The presentation of debt issuance costs has been simplified by requiring that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update. An entity should apply the guidance on a retrospective basis. The Update is effective beginning January 1, 2016 and will not have a material impact on the Company's financial statements. ASU No. 2015-02, Consolidation (Topic 810) - "Amendments to the Consolidation Analysis." Limited partnerships and similar legal entities, the evaluation of fees paid to a decision maker or a service provider as a variable interest, the effect of fee arrangements and related parties on the primary beneficiary determination, and certain investment funds are affected by the guidance which analyzes consolidation requirements. The Update is effective beginning January 1, 2016 and will not have a material impact on the Company's financial statements. ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) A single comprehensive model has been established for an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled, and will supersede nearly all existing revenue recognition guidance, and clarify and converge revenue recognition principles under US GAAP and IFRS. The five steps to recognizing revenue: (i) identify the contracts with the customer; (ii) identify the separate performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the separate performance obligations; and (v) recognize revenue when each performance obligation is satisfied. The most significant potential impact to banking entities relates to less prescriptive derecognition requirements on the sale of owned real estate properties. An entity may elect either a full retrospective or a modified retrospective application. ASU No. 2015-14 - Revenue from Contracts with Customers (Topic 606), defers the effective date to annual and interim periods beginning after December 15, 2017. The Company intends to adopt the Update for the first quarter of 2018. Adoption is not anticipated to have a material impact on the Company's financial statements.

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
Acquisition (Tables)	Dec. 31, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions	The acquisition-date fair value of the consideration transferred consisted of the following: (In thousands) At January 13, Cash $ 50,485 Contingent consideration (1) (5,000 ) Total net consideration transferred $ 45,485 (1) The contingent consideration entitles the Company to receive a rebate of the premium paid for account attrition that occurs during the eighteen-month period beginning on January 13, 2015, the closing date of the transaction.
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date: (In thousands) At January 13, Cash $ 1,446,898 Intangible assets 43,000 Total identifiable assets acquired $ 1,489,898 Deposits $ 1,446,899 Contingent liability (1) 6,000 Total liabilities assumed $ 1,452,899 Net identifiable assets acquired $ 36,999 Goodwill 8,486 Net assets acquired $ 45,485 (1) The contingent liability represents an obligation that existed at the acquisition date. Accordingly, Webster assumed the contingent liability as part of the transaction and has accounted for it at fair value.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
Investment Securities (Tables)	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of Investment Securities	A Summary of the amortized cost and fair value of investment securities is presented below: At December 31, 2015 2014 (In thousands) Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Available-for-sale: U.S. Treasury Bills $ 924 $ — $ — $ 924 $ 525 $ — $ — $ 525 Agency collateralized mortgage obligations (“agency CMO”) 546,168 5,532 (2,946 ) 548,754 543,417 8,636 (1,065 ) 550,988 Agency mortgage-backed securities (“agency MBS”) 1,075,941 6,459 (17,291 ) 1,065,109 1,030,724 10,462 (12,668 ) 1,028,518 Agency commercial mortgage-backed securities (“agency CMBS”) 215,670 639 (959 ) 215,350 80,400 — (134 ) 80,266 Non-agency commercial mortgage-backed securities ("non-agency CMBS") 574,686 7,485 (2,905 ) 579,266 534,631 18,885 (123 ) 553,393 Collateralized loan obligations ("CLO") 431,837 592 (3,270 ) 429,159 426,269 482 (1,017 ) 425,734 Single issuer trust preferred securities 42,168 — (4,998 ) 37,170 41,981 — (3,736 ) 38,245 Corporate debt securities 104,031 2,290 — 106,321 106,520 3,781 — 110,301 Equities - financial institutions 3,499 — (921 ) 2,578 3,500 2,403 — 5,903 Total available-for-sale $ 2,994,924 $ 22,997 $ (33,290 ) $ 2,984,631 $ 2,767,967 $ 44,649 $ (18,743 ) $ 2,793,873 Held-to-maturity: Agency CMO $ 407,494 $ 3,717 $ (2,058 ) $ 409,153 $ 442,129 $ 6,584 $ (739 ) $ 447,974 Agency MBS 2,030,176 38,813 (19,908 ) 2,049,081 2,134,319 57,196 (11,340 ) 2,180,175 Agency CMBS 686,086 4,253 (325 ) 690,014 578,687 1,597 (1,143 ) 579,141 Municipal bonds and notes 435,905 12,019 (417 ) 447,507 373,211 15,138 (55 ) 388,294 Non-agency CMBS 360,018 5,046 (2,704 ) 362,360 338,723 9,428 (1,015 ) 347,136 Private Label MBS 3,373 46 — 3,419 5,886 100 — 5,986 Total held-to-maturity $ 3,923,052 $ 63,894 $ (25,412 ) $ 3,961,534 $ 3,872,955 $ 90,043 $ (14,292 ) $ 3,948,706
Other than Temporary Impairment, Credit Losses Recognized in Earnings	The following table presents the changes in OTTI: Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 3,696 $ 16,633 $ 10,460 Reduction for securities sold or called (518 ) (14,082 ) (1,104 ) Additions for OTTI not previously recognized 110 1,145 7,277 Ending balance $ 3,288 $ 3,696 $ 16,633
Summary of Gross Unrealized Losses not Considered OTTI	The following tables provide information on fair value and unrealized losses for the individual securities with an unrealized loss, aggregated by investment security type and length of time that the individual securities have been in a continuous unrealized loss position: At December 31, 2015 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses # of Holdings Fair Value Unrealized Losses Available-for-sale: Agency CMO $ 195,369 $ (2,195 ) $ 26,039 $ (751 ) 14 $ 221,408 $ (2,946 ) Agency MBS 481,839 (6,386 ) 351,911 (10,905 ) 84 833,750 (17,291 ) Agency CMBS 124,241 (959 ) — — 7 124,241 (959 ) Non-agency CMBS 276,330 (2,879 ) 19,382 (26 ) 29 295,712 (2,905 ) CLO 211,515 (2,709 ) 15,708 (561 ) 13 227,223 (3,270 ) Single issuer trust preferred securities 4,087 (128 ) 33,083 (4,870 ) 8 37,170 (4,998 ) Equities-financial institutions 2,578 (921 ) — — 1 2,578 (921 ) Total available-for-sale in an unrealized loss position $ 1,295,959 $ (16,177 ) $ 446,123 $ (17,113 ) 156 $ 1,742,082 $ (33,290 ) Held-to-maturity: Agency CMO $ 143,364 $ (1,304 ) $ 27,928 $ (754 ) 13 $ 171,292 $ (2,058 ) Agency MBS 551,918 (7,089 ) 470,828 (12,819 ) 87 1,022,746 (19,908 ) Agency CMBS 110,864 (325 ) — — 7 110,864 (325 ) Municipal bonds and notes 29,034 (130 ) 13,829 (287 ) 27 42,863 (417 ) Non-agency CMBS 142,382 (1,983 ) 30,129 (721 ) 18 172,511 (2,704 ) Total held-to-maturity in an unrealized loss position $ 977,562 $ (10,831 ) $ 542,714 $ (14,581 ) 152 $ 1,520,276 $ (25,412 ) At December 31, 2014 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses # of Holdings Fair Value Unrealized Losses Available-for-sale: Agency CMO $ 47,217 $ (240 ) $ 35,968 $ (825 ) 8 $ 83,185 $ (1,065 ) Agency MBS 3,691 (18 ) 641,355 (12,650 ) 64 645,046 (12,668 ) Agency CMBS 80,266 (134 ) — — 4 80,266 (134 ) Non-agency CMBS 24,932 (117 ) 9,396 (6 ) 4 34,328 (123 ) CLO 99,221 (1,017 ) — — 6 99,221 (1,017 ) Single issuer trust preferred securities 4,150 (36 ) 34,095 (3,700 ) 8 38,245 (3,736 ) Equities-financial institutions — — — — — — — Total available-for-sale in an unrealized loss position $ 259,477 $ (1,562 ) $ 720,814 $ (17,181 ) 94 $ 980,291 $ (18,743 ) Held-to-maturity: Agency CMO $ 52,172 $ (187 ) $ 24,942 $ (552 ) 6 $ 77,114 $ (739 ) Agency MBS 20,791 (86 ) 608,568 (11,254 ) 44 629,359 (11,340 ) Agency CMBS 324,394 (1,143 ) — — 17 324,394 (1,143 ) Municipal bonds and notes 5,341 (23 ) 3,074 (32 ) 15 8,415 (55 ) Non-agency CMBS 13,003 (30 ) 65,913 (985 ) 7 78,916 (1,015 ) Total held-to-maturity in an unrealized loss position $ 415,701 $ (1,469 ) $ 702,497 $ (12,823 ) 89 $ 1,118,198 $ (14,292 )
Summary of Sale Proceeds of Available for Sale Securities	The following table provides information on sales of available-for-sale securities: Years ended December 31, (In thousands) 2015 2014 2013 Proceeds from sales $ 95,101 $ 126,580 $ 57,804 Gross realized gains on sales $ 1,029 $ 7,268 $ 2,847 Gross realized losses on sales 420 1,769 2,135 Gain on sale of investment securities, net $ 609 $ 5,499 $ 712
Summary of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities by contractual maturity are set forth below: At December 31, 2015 Available-for-Sale Held-to-Maturity (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 35,941 $ 35,660 $ 320 $ 323 Due after one year through five years 99,028 101,313 33,940 34,880 Due after five through ten years 435,444 433,733 48,818 50,534 Due after ten years 2,421,012 2,411,347 3,839,974 3,875,797 Total debt securities $ 2,991,425 $ 2,982,053 $ 3,923,052 $ 3,961,534

Loans and Leases (Tables)

Loans and Leases (Tables)	12 Months Ended
Loans and Leases (Tables)	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table summarizes loans and leases: At December 31, (In thousands) 2015 2014 Residential $ 4,061,001 $ 3,509,175 Consumer 2,702,560 2,549,401 Commercial 4,315,999 3,749,270 Commercial Real Estate 3,991,649 3,554,428 Equipment Financing 600,526 537,751 Loans and leases (1)(2) $ 15,671,735 $ 13,900,025 (1) Loan and lease balances include net deferred fees and unamortized premiums of $18.0 million and $10.6 million at December 31, 2015 and December 31, 2014 , respectively. (2) Accrued interest of $43.1 million and $38.4 million at December 31, 2015 and December 31, 2014 , respectively, are not included in the loan and lease balances.
Past Due Financing Receivables	The following tables summarize the aging of loans and leases: At December 31, 2015 (In thousands) 30-59 Days Past Due and Accruing 60-89 Days 90 or More Days Past Due and Accruing Non-accrual Total Past Due and Non-accrual (1) Current Total Loans and Leases Residential $ 10,365 $ 4,703 $ 2,029 $ 54,201 $ 71,298 $ 3,989,703 $ 4,061,001 Consumer: Home equity 9,061 4,242 — 37,337 50,640 2,402,758 2,453,398 Other consumer 1,390 615 — 560 2,565 246,597 249,162 Commercial: Commercial non-mortgage 768 3,288 22 27,037 31,115 3,531,669 3,562,784 Asset-based — — — — — 753,215 753,215 Commercial real estate: Commercial real estate 1,624 625 — 16,767 19,016 3,673,408 3,692,424 Commercial construction — — — 3,461 3,461 295,764 299,225 Equipment financing 543 59 — 706 1,308 599,218 600,526 Total $ 23,751 $ 13,532 $ 2,051 $ 140,069 $ 179,403 $ 15,492,332 $ 15,671,735 At December 31, 2014 (In thousands) 30-59 Days Past Due and Accruing 60-89 Days 90 or More Days Past Due and Accruing Non-accrual Total Past Due and Non-accrual (1) Current Total Loans and Leases Residential (2) $ 11,410 $ 5,840 $ 2,039 $ 64,117 $ 83,406 $ 3,425,769 $ 3,509,175 Consumer: Home equity 11,393 5,076 — 40,026 56,495 2,417,275 2,473,770 Other consumer 704 410 — 281 $ 1,395 74,236 75,631 Commercial: Commercial non-mortgage 1,948 153 48 6,449 8,598 3,079,342 3,087,940 Asset-based — — — — — 661,330 661,330 Commercial real estate: Commercial real estate 2,325 392 — 15,038 17,755 3,302,652 3,320,407 Commercial construction — — — 3,659 3,659 230,362 234,021 Equipment financing 551 150 — 578 1,279 536,472 537,751 Total $ 28,331 $ 12,021 $ 2,087 $ 130,148 $ 172,587 $ 13,727,438 $ 13,900,025 (1) Loans and leases 30 days or more days past due and accruing exclude $0.6 million and $0.5 million of accrued interest receivable at December 31, 2015 and December 31, 2014 , respectively. (2) U.S. Government guaranteed loans of approximately $2.0 million were reclassified from non-accrual to over 90 days past due and accruing reflective of a policy change effective in the first quarter of 2015 .
Activity In Allowance For Losses	The following tables summarize the activity in, as well as the loan and lease balances that were evaluated for, the ALLL: At or for the Year ended December 31, 2015 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance at January 1, 2015 $ 25,452 $ 43,518 $ 52,114 $ 32,102 $ 6,078 $ 159,264 Provision (benefit) charged to expense 6,057 11,847 23,356 9,718 (1,678 ) 49,300 Losses charged off (6,508 ) (17,679 ) (11,522 ) (7,578 ) (273 ) (43,560 ) Recoveries 875 4,366 2,738 647 1,360 9,986 Balance at December 31, 2015 $ 25,876 $ 42,052 $ 66,686 $ 34,889 $ 5,487 $ 174,990 Individually evaluated for impairment $ 10,364 $ 3,477 $ 5,197 $ 3,163 $ 3 $ 22,204 Collectively evaluated for impairment $ 15,512 $ 38,575 $ 61,489 $ 31,726 $ 5,484 $ 152,786 Loan and lease balances: Individually evaluated for impairment $ 134,448 $ 48,425 $ 56,581 $ 39,295 $ 422 $ 279,171 Collectively evaluated for impairment 3,926,553 2,654,135 4,259,418 3,952,354 600,104 15,392,564 Loans and leases $ 4,061,001 $ 2,702,560 $ 4,315,999 $ 3,991,649 $ 600,526 $ 15,671,735 At or for the Year ended December 31, 2014 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance at January 1, 2014 $ 23,027 $ 41,951 $ 51,001 $ 32,408 $ 4,186 $ 152,573 Provision (benefit) charged to expense 7,315 17,224 10,412 2,046 253 37,250 Losses charged off (6,214 ) (20,712 ) (13,668 ) (3,237 ) (595 ) (44,426 ) Recoveries 1,324 5,055 4,369 885 2,234 13,867 Balance at December 31, 2014 $ 25,452 $ 43,518 $ 52,114 $ 32,102 $ 6,078 $ 159,264 Individually evaluated for impairment $ 12,094 $ 4,237 $ 2,710 $ 6,232 $ 28 $ 25,301 Collectively evaluated for impairment $ 13,358 $ 39,281 $ 49,404 $ 25,870 $ 6,050 $ 133,963 Loan and lease balances: Individually evaluated for impairment $ 141,982 $ 50,249 $ 36,176 $ 101,817 $ 632 $ 330,856 Collectively evaluated for impairment 3,367,193 2,499,152 3,713,094 3,452,611 537,119 13,569,169 Loans and leases $ 3,509,175 $ 2,549,401 $ 3,749,270 $ 3,554,428 $ 537,751 $ 13,900,025 At or for the Year ended December 31, 2013 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance at January 1, 2013 $ 32,030 $ 56,995 $ 50,562 $ 33,210 $ 4,332 $ 177,129 Provision (benefit) charged to expense 1,187 7,808 14,442 12,975 (2,912 ) 33,500 Losses charged off (11,592 ) (29,037 ) (19,126 ) (15,425 ) (279 ) (75,459 ) Recoveries 1,402 6,185 5,123 1,648 3,045 17,403 Balance at December 31, 2013 $ 23,027 $ 41,951 $ 51,001 $ 32,408 $ 4,186 $ 152,573 Individually evaluated for impairment $ 10,535 $ 4,595 $ 1,878 $ 3,445 $ — $ 20,453 Collectively evaluated for impairment $ 12,492 $ 37,356 $ 49,123 $ 28,963 $ 4,186 $ 132,120 Loan and lease balances: Individually evaluated for impairment $ 142,413 $ 52,092 $ 52,018 $ 104,808 $ 210 $ 351,541 Collectively evaluated for impairment 3,219,012 2,484,596 3,230,833 2,953,554 460,240 12,348,235 Loans and leases $ 3,361,425 $ 2,536,688 $ 3,282,851 $ 3,058,362 $ 460,450 $ 12,699,776
Impaired Loans	The following tables summarize impaired loans and leases: At December 31, 2015 (In thousands) Unpaid Principal Balance Total Recorded Investment (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential: 1-4 family $ 148,144 $ 134,448 $ 23,024 $ 111,424 $ 10,364 Consumer: Home equity 56,680 48,425 25,130 23,295 3,477 Commercial: Commercial non-mortgage 67,116 56,581 31,600 24,981 5,197 Commercial real estate: Commercial real estate 36,980 33,333 9,204 24,129 3,160 Commercial construction 7,010 5,962 5,939 23 3 Equipment financing 612 422 328 94 3 Total $ 316,542 $ 279,171 $ 95,225 $ 183,946 $ 22,204 At December 31, 2014 (In thousands) Unpaid Principal Balance Total Recorded Investment (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential: 1-4 family $ 157,152 $ 141,982 $ 24,335 $ 117,647 $ 12,094 Consumer: Home equity 60,424 50,249 26,432 23,817 4,237 Commercial: Commercial non-mortgage 41,019 36,176 15,998 20,178 2,710 Commercial real estate: Commercial real estate 99,687 95,656 40,306 55,350 6,222 Commercial construction 7,218 6,161 5,940 221 10 Equipment financing 629 632 — 632 28 Total $ 366,129 $ 330,856 $ 113,011 $ 217,845 $ 25,301 (1) Total recorded investment of impaired loans and leases exclude $1.7 million and $1.4 million of accrued interest receivable at December 31, 2015 and December 31, 2014 , respectively. The following table summarizes the average recorded investment and interest income recognized for impaired loans and leases: Years ended December 31, 2015 2014 2013 (In thousands) Average Recorded Investment Accrued Interest Income Cash Basis Interest Income Average Recorded Investment Accrued Interest Income Cash Basis Interest Income Average Accrued Cash Basis Interest Income Residential $ 138,215 $ 4,473 $ 1,139 $ 142,198 $ 4,644 $ 1,221 $ 144,325 $ 4,119 $ 1,954 Consumer 49,337 1,451 1,099 51,171 1,484 1,203 53,318 1,003 1,724 Commercial 46,379 1,319 — 44,097 2,326 — 60,558 2,889 — Commercial real estate: Commercial real estate 64,495 1,165 — 93,209 3,429 — 105,676 4,476 — Commercial construction 6,062 133 — 8,381 269 — 15,254 620 — Equipment financing 527 16 — 421 28 — 1,284 22 — Total $ 305,015 $ 8,557 $ 2,238 $ 339,477 $ 12,180 $ 2,424 $ 380,415 $ 13,129 $ 3,678
Financing Receivable Credit Quality Indicators	The following table summarize commercial, commercial real estate and equipment financing loans and leases segregated by risk rating exposure: Commercial Commercial Real Estate Equipment Financing (In thousands) At December 31, At December 31, At December 31, At December 31, At December 31, At December 31, (1) - (6) Pass $ 4,023,255 $ 3,545,218 $ 3,857,019 $ 3,408,128 $ 586,445 $ 516,116 (7) Special Mention 70,904 88,777 55,030 33,453 1,628 4,364 (8) Substandard 220,389 115,106 79,289 112,354 12,453 17,271 (9) Doubtful 1,451 169 311 493 — — Total $ 4,315,999 $ 3,749,270 $ 3,991,649 $ 3,554,428 $ 600,526 $ 537,751
Troubled Debt Restructurings on Financing Receivables	Troubled Debt Restructurings The following table summarizes information for TDRs: At December 31, (Dollars in thousands) 2015 2014 Accrual status $ 171,784 $ 241,855 Non-accrual status 100,906 76,939 Total recorded investment of TDRs (1) $ 272,690 $ 318,794 Accruing TDRs performing under modified terms more than one year 55.0 % 67.5 % Specific reserves for TDRs included in the balance of allowance for loan and lease losses $ 21,405 $ 23,785 Additional funds committed to borrowers in TDR status 1,133 552 (1) Total recorded investment of TDRs exclude $1.1 million and $1.4 million at December 31, 2015 and December 31, 2014 , respectively, of accrued interest receivable. For years ended December 31, 2015 , 2014 and 2013 , Webster charged off $11.8 million , $13.5 million , and $24.4 million , respectively, for the portion of TDRs deemed to be uncollectible. TDRs may be modified by means of extended maturity, below market adjusted interest rates, a combination of rate and maturity, or other means, including covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, or other concessions. The following table provides information on the type of concession for loans and leases modified as TDRs: Years ended December 31, 2015 2014 2013 Number of Loans and Leases Post- Modification Recorded Investment (1) Number of Loans and Leases Post- Modification Recorded Investment (1) Number of Loans and Leases Post- Modification Recorded Investment (1) (Dollars in thousands) Residential: Extended Maturity 27 $ 4,909 27 $ 3,547 27 $ 5,219 Adjusted Interest rates 3 573 3 448 8 2,759 Combination Rate and Maturity 26 5,315 22 4,220 45 8,264 Other (2) 30 4,366 55 11,791 44 9,497 Consumer: Extended Maturity 12 1,012 19 944 24 1,159 Adjusted Interest rates — — 1 51 4 154 Combination Rate and Maturity 12 945 6 411 14 1,504 Other (2) 68 3,646 90 4,931 100 4,247 Commercial: Extended Maturity 3 254 7 422 3 7,525 Adjusted Interest rates 1 24 1 25 — — Combination Rate and Maturity 7 5,361 22 1,212 22 1,083 Other (2) 20 22,048 6 7,431 4 4,603 Commercial real estate: Extended Maturity 1 315 — — 3 226 Combination Rate and Maturity 1 42 2 11,106 6 15,520 Other (2) 1 405 — — 1 68 Equipment Financing Extended Maturity — — 1 492 — — Total 212 $ 49,215 262 $ 47,031 305 $ 61,828 (1) Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant. (2) Other includes covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, and/or other concessions. The following table provides information on loans and leases modified as TDRs within the previous 12 months and for which there was a payment default during the periods presented: Years ended December 31, 2015 2014 2013 (Dollars in thousands) Number of Loans and Leases Recorded Investment Number of Loans and Leases Recorded Investment Number of Loans and Leases Recorded Investment Residential 1 $ 55 7 $ 1,494 9 $ 1,201 Consumer 1 3 2 24 4 339 Commercial — — — — 1 47 Commercial real estate — — — — — — Total 2 $ 58 9 $ 1,518 14 $ 1,587 The recorded investment of TDRs in commercial, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: At December 31, (In thousands) 2015 2014 (1) - (6) Pass $ 12,970 $ 40,734 (7) Special Mention 2,999 8,275 (8) Substandard 72,132 77,211 (9) Doubtful 1,717 343 Total $ 89,818 $ 126,563

Transfers of Financial Assets35

Transfers of Financial Assets and Mortgage Servicing Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Transfers and Servicing [Abstract]
Schedule of Reserve For Loan Repurchases Table	The following table provides a summary of activity in the reserve for loan repurchases: Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 1,059 $ 2,254 $ 2,617 Provision (benefit) 133 (493 ) 1,209 Loss on repurchased loans and settlements — (702 ) (1,572 ) Ending balance $ 1,192 $ 1,059 $ 2,254
Schedule of Loan Sale Activity	The following table provides information for mortgage banking activities: Years ended December 31, (In thousands) 2015 (1) 2014 2013 Residential mortgage loans: Proceeds from the sale of loans held for sale $ 452,590 $ 287,132 $ 773,887 Net gain on sale 7,795 4,070 16,359 Loans sold with servicing rights retained 416,277 264,292 690,300 Commercial loans: Proceeds from the sale of loans held for sale 729 — 12,771 Net gain (loss) on sale 145 — (229 ) (1) Additionally, certain consumer loans not originated for sale were sold at cost for cash proceeds of $32.9 million .
Schedule of Servicing Assets at Fair Value	The following table presents the changes in fair value for those mortgage servicing assets: Years ended December 31, (In thousands) 2015 2014 Beginning balance $ 28,690 $ 29,150 Originations of servicing assets 8,027 4,581 Changes in fair value: Due to payoffs/paydowns (2,741 ) (2,577 ) Due to market changes (408 ) (2,464 ) Ending balance $ 33,568 $ 28,690

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
Premises and Equipment (Tables)	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	A summary of premises and equipment follows: At December 31, (In thousands) 2015 2014 Land $ 12,899 $ 12,987 Buildings and improvements 94,686 95,843 Leasehold improvements 79,917 78,029 Fixtures and equipment 73,686 73,180 Data processing and software 195,308 175,887 Total premises and equipment 456,496 435,926 Less: Accumulated depreciation and amortization (327,070 ) (313,993 ) Premises and equipment, net $ 129,426 $ 121,933
Disclosure of Long Lived Assets Held-for-sale	The following table provides a summary of activity for assets held for disposition: Years ended December 31, (In thousands) 2015 2014 Beginning balance $ 759 $ 1,567 Additions 144 1,061 Write-downs — (432 ) Sales (266 ) (1,437 ) Ending balance $ 637 $ 759

Goodwill and Other Intangible37

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
Goodwill and Other Intangible Assets (Tables)	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets, Net Of Accumulated Amortization	The following table presents the carrying value for goodwill allocated by reportable segment: (In thousands) Community Banking HSA Bank Total Goodwill Balance at January 1, 2015 $ 516,560 $ 13,327 $ 529,887 Goodwill acquired — 8,486 8,486 Balance at December 31, 2015 $ 516,560 $ 21,813 $ 538,373
Schedule of Finite-Lived Intangible Assets	The gross carrying amount and accumulated amortization of core deposit intangibles ("CDI") and customer relationships included in the reportable segments are as follows: At December 31, 2015 2014 (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Community Banking, CDI $ 49,420 $ (48,277 ) $ 1,143 $ 49,420 $ (46,754 ) $ 2,666 HSA Bank: CDI 22,000 (3,269 ) 18,731 — — — Customer relationships 21,000 (1,548 ) 19,452 — — — Total HSA Bank 43,000 (4,817 ) 38,183 — — — Total other intangible assets $ 92,420 $ (53,094 ) $ 39,326 $ 49,420 $ (46,754 ) $ 2,666
Schedule Of Expected Amortization Expense, Next Four Years	As of December 31, 2015 , the remaining estimated aggregate future amortization expense for intangible assets is as follows: (In thousands) 2016 $ 5,652 2017 4,062 2018 3,847 2019 3,847 2020 3,847 Thereafter 18,071

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Income tax expense reflects the following expense (benefit) components: Years ended December 31, (In thousands) 2015 2014 2013 Current: Federal $ 98,442 $ 90,542 $ 62,042 State and local 11,047 6,585 3,572 Total current 109,489 97,127 65,614 Deferred: Federal (7,279 ) (3,784 ) 10,760 State and local (8,234 ) (1,370 ) 739 Total deferred (15,513 ) (5,154 ) 11,499 Total federal 91,163 86,758 72,802 Total state and local 2,813 5,215 4,311 Income tax expense $ 93,976 $ 91,973 $ 77,113
Schedule of Effective Income Tax Rate Reconciliation	The following table reflects a reconciliation of reported income tax expense to the amount that would result from applying the federal statutory rate of 35.0% : Years ended December 31, 2015 2014 2013 (Dollars in thousands) Amount Percent Amount Percent Amount Percent Income tax expense at federal statutory rate $ 105,111 35.0 % $ 102,095 35.0 % $ 89,799 35.0 % Reconciliation to reported income tax expense: State and local income taxes, net of federal benefit 7,613 2.5 3,390 1.2 2,802 1.1 Tax-exempt interest income, net (7,117 ) (2.4 ) (7,335 ) (2.5 ) (8,517 ) (3.3 ) Decrease in valuation allowance applicable to net state deferred tax assets, net of federal effects (5,785 ) (1.9 ) — — — — Increase in cash surrender value of life insurance (4,557 ) (1.5 ) (4,612 ) (1.6 ) (4,819 ) (1.9 ) Other, net (1,289 ) (0.4 ) (1,565 ) (0.6 ) (2,152 ) (0.8 ) Income tax expense and effective tax rate $ 93,976 31.3 % $ 91,973 31.5 % $ 77,113 30.1 %
Schedule of Deferred Tax Assets and Liabilities	The following table reflects the significant components of the deferred tax asset, net (“DTA”): At December 31, (In thousands) 2015 2014 Deferred tax assets: Allowance for loan and lease losses $ 70,937 $ 65,288 Net operating loss and credit carry forwards 62,403 64,561 Compensation and employee benefit plans 52,422 47,748 Net losses on derivative instruments 11,734 12,637 Net unrealized loss on securities available for sale 4,138 — Other 27,862 27,300 Gross deferred tax assets 229,496 217,534 Valuation allowance (74,918 ) (80,722 ) Total deferred tax assets, net of valuation allowance $ 154,578 $ 136,812 Deferred tax liabilities: Net unrealized gain on securities available for sale $ — $ 10,288 Equipment-financing leases 23,934 21,930 Deferred income on repurchase of debt 6,376 8,502 Intangible assets 9,165 9,242 Mortgage servicing assets 7,127 7,230 Other 6,398 5,747 Gross deferred tax liabilities 53,000 62,939 Deferred tax asset, net $ 101,578 $ 73,873
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible	The following table reflects a reconciliation of the beginning and ending balances for unrecognized tax benefits (“UTBs”): Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 4,593 $ 3,109 $ 3,119 Additions as a result of tax positions taken during the current year 865 956 528 Additions as a result of tax positions taken during prior years 1,254 1,031 442 Reductions as a result of tax positions taken during prior years (247 ) — (460 ) Reductions relating to settlements with taxing authorities (992 ) — — Reductions as a result of lapse of statute of limitations (379 ) (503 ) (520 ) Ending balance $ 5,094 $ 4,593 $ 3,109

Deposits (Tables)

Deposits (Tables)	12 Months Ended
Deposits (Tables)	Dec. 31, 2015
Banking and Thrift [Abstract]
Summary of Deposits	A summary of deposits by type follows: At December 31, (In thousands) 2015 2014 Non-interest-bearing: Demand $ 3,713,063 $ 3,598,872 Interest-bearing: Checking 2,369,971 2,155,047 Health savings accounts 3,802,313 1,824,799 Money market 1,933,460 1,908,522 Savings 4,047,817 3,892,778 Time deposits 2,086,154 2,271,587 Total interest-bearing 14,239,715 12,052,733 Total deposits $ 17,952,778 $ 15,651,605 Time deposits and interest-bearing checking, included in above balances, obtained through brokers $ 910,304 $ 651,725 Time deposits, included in above balance, that meet or exceed the Federal Deposit Insurance Corporation limit 542,206 533,980 Demand deposit overdrafts reclassified as loan balances 1,356 1,655
Schedule Of Time Deposits Maturities Table [Table Text Block]	The scheduled maturities of time deposits are as follows: (In thousands) At December 31, 2015 2016 $ 1,034,275 2017 253,782 2018 240,921 2019 392,926 2020 164,154 Thereafter 96 Total time deposits $ 2,086,154

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
Borrowings (Tables)	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The following table summarizes securities sold under agreements to repurchase and other borrowings: At December 31, (In thousands) 2015 2014 Securities sold under agreements to repurchase: Original maturity of one year or less $ 334,400 $ 409,756 Original maturity of greater than one year, non-callable 500,000 550,000 Total securities sold under agreements to repurchase 834,400 959,756 Fed funds purchased 317,000 291,000 Securities sold under agreements to repurchase and other borrowings $ 1,151,400 $ 1,250,756
Federal Home Loan Bank, Advances	The following table provides information for Federal Home Loan Bank advances maturing: At December 31, 2015 2014 (Dollars in thousands) Total Outstanding Weighted- Average Contractual Coupon Rate Total Outstanding Weighted- Average Contractual Coupon Rate Within 1 year $ 2,025,934 0.55 % $ 2,275,000 0.23 % After 1 but within 2 years 500 5.66 145,934 1.80 After 2 but within 3 years 200,000 1.36 500 5.66 After 3 but within 4 years 103,026 1.54 200,000 1.36 After 4 but within 5 years 175,000 1.77 78,026 1.95 After 5 years 159,655 1.60 159,934 1.27 2,664,115 0.79 % 2,859,394 0.50 % Unamortized premiums 24 37 Federal Home Loan Bank advances $ 2,664,139 $ 2,859,431
Schedule of Long-Term Debt	The following table summarizes long-term debt: At December 31, (Dollars in thousands) 2015 2014 4.375% Senior fixed-rate notes due February 15, 2024 $ 150,000 $ 150,000 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (1) 77,320 77,320 Total notes and subordinated debt 227,320 227,320 Unamortized discount on senior fixed-rate notes (964 ) (1,083 ) Long-term debt $ 226,356 $ 226,237 (1) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95% , was 3.48% at December 31, 2015 and 3.19% at December 31, 2014

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
Shareholders' Equity (Tables)	Dec. 31, 2015
Equity [Abstract]
Schedule of Stock by Class	Share activity during the year ended December 31, 2015 is as follows: Preferred Stock Series A Preferred Stock Series E Common Stock Issued Treasury Stock Held Common Stock Outstanding Balance at January 1, 2015 28,939 5,060 93,623,090 3,241,555 90,381,535 Restricted share activity — — — (377,598 ) 377,598 Stock options exercised — — — (58,473 ) 58,473 Common stock repurchased — — — 350,000 (350,000 ) Warrant exercise — — 28,511 — 28,511 Series A conversion (28,939 ) — — (1,065,075 ) 1,065,075 Balance at December 31, 2015 — 5,060 93,651,601 2,090,409 91,561,192

Accumulated Other Comprehensi42

Accumulated Other Comprehensive Loss, Net of Tax (Tables)	12 Months Ended
Accumulated Other Comprehensive Loss, Net of Tax (Tables)	Dec. 31, 2015
Equity [Abstract]
Schedule of Other Comprehensive Income (Loss)	The following table summarizes the changes in accumulated other comprehensive loss, net of tax by component: (In thousands) Available For Sale and Transferred Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance at December 31, 2012 $ 42,741 $ (27,902 ) $ (47,105 ) $ (32,266 ) Other comprehensive (loss) income before reclassifications (49,572 ) 3,744 17,298 (28,530 ) Amounts reclassified from accumulated other comprehensive income (loss) 4,214 5,952 2,081 12,247 Net current-period other comprehensive (loss) income, net of tax (45,358 ) 9,696 19,379 (16,283 ) Balance at December 31, 2013 (2,617 ) (18,206 ) (27,726 ) (48,549 ) Other comprehensive income (loss) before reclassifications 21,811 (12,506 ) (19,496 ) (10,191 ) Amounts reclassified from accumulated other comprehensive income (loss) (2,773 ) 5,182 70 2,479 Net current-period other comprehensive income (loss), net of tax 19,038 (7,324 ) (19,426 ) (7,712 ) Balance at December 31, 2014 16,421 (25,530 ) (47,152 ) (56,261 ) Other comprehensive (loss) income before reclassifications (22,512 ) (3,136 ) (3,395 ) (29,043 ) Amounts reclassified from accumulated other comprehensive income (loss) (316 ) 5,686 1,828 7,198 Net current-period other comprehensive (loss) income, net of tax (22,828 ) 2,550 (1,567 ) (21,845 ) Balance at December 31, 2015 $ (6,407 ) $ (22,980 ) $ (48,719 ) $ (78,106 )
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table provides information for the items reclassified from accumulated other comprehensive loss, net of tax: Years ended December 31, Accumulated Other Comprehensive Loss Components 2015 2014 2013 Associated Line Item in the Consolidated Statements Of Income (In thousands) Available-for-sale and transferred securities: Unrealized gains (losses) on investments $ 609 $ 5,499 $ 712 Gain on sale of investment securities, net Unrealized gains (losses) on investments (110 ) (1,145 ) (7,277 ) Impairment loss recognized in earnings Tax (expense) benefit (183 ) (1,581 ) 2,351 Income tax expense Net of tax $ 316 $ 2,773 $ (4,214 ) Derivative instruments: Cash flow hedges $ (8,965 ) $ (8,100 ) $ (9,272 ) Total interest expense Tax benefit 3,279 2,918 3,320 Income tax expense Net of tax $ (5,686 ) $ (5,182 ) $ (5,952 ) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (2,809 ) $ (37 ) $ (3,169 ) Compensation and benefits Prior service costs (73 ) (73 ) (73 ) Compensation and benefits Tax benefit 1,054 40 1,161 Income tax expense Net of tax $ (1,828 ) $ (70 ) $ (2,081 ) The following tables summarize the items and related tax effects for each component of other comprehensive loss, net of tax: Year ended December 31, 2015 (In thousands) Pre-Tax Amount Tax Benefit (Expense) Net of Tax Amount Available-for-sale and transferred securities: Net unrealized loss during the period $ (35,701 ) $ 13,166 $ (22,535 ) Reclassification for net gain included in net income (609 ) 223 (386 ) Net non-credit other than temporary impairment 110 (40 ) 70 Amortization of unrealized loss on securities transferred to held-to-maturity 37 (14 ) 23 Total available-for-sale and transferred securities (36,163 ) 13,335 (22,828 ) Derivative instruments: Net unrealized loss during the period (4,945 ) 1,809 (3,136 ) Reclassification adjustment for net loss included in net income 8,965 (3,279 ) 5,686 Total derivative instruments 4,020 (1,470 ) 2,550 Defined benefit pension and other postretirement benefit plans: Current year actuarial loss (5,367 ) 1,972 (3,395 ) Reclassification adjustment for amortization of net loss included in net income 2,809 (1,027 ) 1,782 Reclassification adjustment for prior service cost included in net income 73 (27 ) 46 Total defined benefit pension and postretirement benefit plans (2,485 ) 918 (1,567 ) Other comprehensive loss $ (34,628 ) $ 12,783 $ (21,845 ) Year ended December 31, 2014 (In thousands) Pre-Tax Amount Tax Benefit (Expense) Net of Tax Amount Available-for-sale and transferred securities: Net unrealized gain during the period $ 34,242 $ (12,469 ) $ 21,773 Reclassification for net gain included in net income (5,499 ) 1,999 (3,500 ) Net non-credit other than temporary impairment 1,145 (418 ) 727 Amortization of unrealized loss on securities transferred to held-to-maturity 60 (22 ) 38 Total available-for-sale and transferred securities 29,948 (10,910 ) 19,038 Derivative instruments: Net unrealized loss during the period (19,589 ) 7,083 (12,506 ) Reclassification adjustment for net loss included in net income 8,100 (2,918 ) 5,182 Total derivative instruments (11,489 ) 4,165 (7,324 ) Defined benefit pension and other postretirement benefit plans: Current year actuarial loss (30,683 ) 11,187 (19,496 ) Reclassification adjustment for amortization of net loss included in net income 37 (14 ) 23 Reclassification adjustment for prior service cost included in net income 73 (26 ) 47 Total defined benefit pension and postretirement benefit plans (30,573 ) 11,147 (19,426 ) Other comprehensive loss $ (12,114 ) $ 4,402 $ (7,712 ) Year ended December 31, 2013 (In thousands) Pre-Tax Amount Tax Benefit (Expense) Net of Tax Amount Available-for-sale and transferred securities: Net unrealized loss during the period $ (77,524 ) $ 27,762 $ (49,762 ) Reclassification for net gain included in net income (712 ) 255 (457 ) Net non-credit other than temporary impairment 7,277 (2,606 ) 4,671 Amortization of unrealized loss on securities transferred to held-to-maturity 296 (106 ) 190 Total available-for-sale and transferred securities (70,663 ) 25,305 (45,358 ) Derivative instruments: Net unrealized gain during the period 5,826 (2,082 ) 3,744 Reclassification adjustment for net loss included in net income 9,272 (3,320 ) 5,952 Total derivative instruments 15,098 (5,402 ) 9,696 Defined benefit pension and other postretirement benefit plans: Current year actuarial gain 26,949 (9,651 ) 17,298 Reclassification adjustment for amortization of net loss included in net income 3,169 (1,135 ) 2,034 Reclassification adjustment for prior service cost included in net income 73 (26 ) 47 Total defined benefit pension and postretirement benefit plans 30,191 (10,812 ) 19,379 Other comprehensive loss $ (25,374 ) $ 9,091 $ (16,283 )

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
Regulatory Matters (Tables)	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Information On The Capital Ratios	The following table provides information on the capital ratios for Webster Financial Corporation and Webster Bank, N.A.: Actual (1) Capital Requirements (1) Minimum Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio At December 31, 2015 Webster Financial Corporation Common equity tier 1 risk-based capital $ 1,825,717 10.7 % $ 766,928 4.5 % $ 1,107,785 6.5 % Total risk-based capital 2,201,928 12.9 1,363,427 8.0 1,704,284 10.0 Tier 1 risk-based capital 1,966,829 11.5 1,022,570 6.0 1,363,427 8.0 Tier 1 leverage capital 1,966,829 8.2 954,403 4.0 1,193,004 5.0 Webster Bank, N.A. Common equity tier 1 risk-based capital $ 1,870,852 11.0 % $ 765,232 4.5 % $ 1,105,335 6.5 % Total risk-based capital 2,047,961 12.0 1,360,412 8.0 1,700,515 10.0 Tier 1 risk-based capital 1,870,852 11.0 1,020,309 6.0 1,360,412 8.0 Tier 1 leverage capital 1,870,852 7.9 953,371 4.0 1,191,714 5.0 At December 31, 2014 Webster Financial Corporation Total risk-based capital $ 2,096,772 14.1 % $ 1,192,651 8.0 % $ 1,490,814 10.0 % Tier 1 risk-based capital 1,931,276 13.0 596,326 4.0 894,488 6.0 Tier 1 leverage capital 1,931,276 9.0 859,241 4.0 1,074,051 5.0 Webster Bank, N.A. Total risk-based capital $ 1,939,229 13.0 % $ 1,190,242 8.0 % $ 1,487,803 10.0 % Tier 1 risk-based capital 1,774,814 11.9 595,121 4.0 892,682 6.0 Tier 1 leverage capital 1,774,814 8.3 858,197 4.0 1,072,746 5.0 (1) Calculated under the Basel III capital standard at December 31, 2015 and under the Basel I capital standard at December 31, 2014 .

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
Earnings Per Common Share (Tables)	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share Basic And Diluted	Reconciliation of the calculation of basic and diluted earnings per common share follows: Years ended December 31, (In thousands, except per share data) 2015 2014 2013 Earnings for basic and diluted earnings per common share: Net income $ 206,340 $ 199,726 $ 179,456 Less: Preferred stock dividends 8,711 10,556 10,803 Net income available to common shareholders 197,629 189,170 168,653 Less: Earnings applicable to participating securities 660 674 617 Earnings applicable to common shareholders $ 196,969 $ 188,496 $ 168,036 Shares: Weighted-average common shares outstanding - basic 90,968 89,899 88,713 Effect of dilutive securities: Stock options and restricted stock 524 466 436 Warrants - US Treasury 41 255 190 Warrants - Warburg — — 922 Weighted-average common shares outstanding - diluted 91,533 90,620 90,261 Earnings per common share: Basic $ 2.17 $ 2.10 $ 1.90 Diluted 2.15 2.08 1.86
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Potential common shares excluded from the effect of dilutive securities because they would have been anti-dilutive, are as follows: Years ended December 31, (In thousands) 2015 2014 2013 Stock options (shares with exercise price greater than market price) 213 587 850 Restricted stock (due to performance conditions on non-participating shares) 92 171 201

Derivative Financial Instrume45

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	The notional amounts of derivative instruments are shown in the table below: At December 31, (In thousands) 2015 2014 Interest rate derivatives $ 5,366,372 $ 10,237,325 RPA-In 92,985 55,626 RPA-Out 41,798 34,822 Other 12,858 60 Total notional amount of derivative instruments $ 5,514,013 $ 10,327,833
Fair Value Of Derivative Financial Instruments Designated As Cash Flow Hedges	The table below presents the fair value for derivative instruments as classified in the accompanying Consolidated Balance Sheets: At December 31, 2015 2014 (In thousands) Other Assets Other Liabilities Other Assets Other Liabilities Derivatives designated as hedging instruments: Interest rate derivatives $ 2,507 $ 1,359 $ 4,481 $ 4,598 Derivatives not designated as hedging instruments: Interest rate derivatives 58,304 38,619 48,209 31,915 RPA-In — 245 — 258 RPA-Out 153 — 182 — Other 183 75 — 7 Total derivatives not designated as hedging instruments $ 58,640 $ 38,939 $ 48,391 $ 32,180
Interest Rate Swaps And Caps Not Designated For Hedge Accounting	Changes in the fair value of derivatives not qualifying for hedge accounting treatment are reported as a component of other non-interest income in the accompanying Consolidated Statements of Income as follows: Years ended December 31, (In thousands) 2015 2014 2013 Interest rate derivatives $ 4,361 $ 4,482 $ 3,244 RPA (33 ) 51 — Other (63 ) (253 ) (120 ) Total impact on non-interest income $ 4,265 $ 4,280 $ 3,124
Offsetting Assets and Liabilities	The tables below present the financial assets and liabilities for non-customer derivative positions, including futures contracts, summarized by dealer counterparty, or Webster's designated derivative clearing organization ("DCO"): At December 31, 2015 Notional Amount Hedge Accounting Positions Non-Hedge Accounting Positions Liability, net Cash Collateral Posted Net Exposure (1) (In thousands) Gain Loss Gain Loss Dealer A $ 391,745 $ 248 $ (1,359 ) $ 504 $ (3,439 ) $ (4,046 ) $ 3,800 $ — Dealer B 274,353 752 — 348 (4,104 ) (3,004 ) 3,020 16 Dealer C 5,775 — — — (433 ) (433 ) — — Dealer D 387,550 377 — 125 (2,048 ) (1,546 ) 1,300 — Dealer E 421,545 1,130 — 138 (1,912 ) (644 ) 470 — DCO 1,352,206 — — 1,140 (28,366 ) (27,226 ) 42,975 15,749 Total $ 2,833,174 $ 2,507 $ (1,359 ) $ 2,255 $ (40,302 ) $ (36,899 ) $ 51,565 At December 31, 2014 Notional Amount Hedge Accounting Positions Non-Hedge Accounting Positions (Liability)/ Asset, net Cash Collateral Posted (Received) Net Exposure (1) (In thousands) Gain Loss Gain Loss Dealer A $ 427,430 $ — $ (739 ) $ 1,861 $ (6,576 ) $ (5,454 ) $ 5,300 $ — Dealer B 319,663 1,494 — 978 (6,420 ) (3,948 ) 3,610 — Dealer C 11,538 — — — (834 ) (834 ) — — Dealer D 303,663 747 — 1,147 (1,627 ) 267 (400 ) — Dealer E 424,401 2,240 — 867 (1,698 ) 1,409 (1,420 ) — DCO 6,631,936 — (3,858 ) 555 (17,629 ) (20,932 ) 39,037 18,105 Total $ 8,118,631 $ 4,481 $ (4,597 ) $ 5,408 $ (34,784 ) $ (29,492 ) $ 46,127 (1) Net positive exposure represents over-collateralized loss positions which can result from DCO initial margin requirements posted in compliance with the Dodd-Frank Wall Street Reform and Consumer Protection Act.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Of Assets And Liabilities Measured On Recurring Basis	Summaries of the fair values of assets and liabilities measured at fair value on a recurring basis are as follows: At December 31, 2015 (In thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets held at fair value: Available-for-sale investment securities: U.S. Treasury Bills $ 924 $ 924 $ — $ — Agency CMO 548,754 — 548,754 — Agency MBS 1,065,109 — 1,065,109 — Agency CMBS 215,350 — 215,350 — Non-agency CMBS 579,266 — 579,266 — CLO 429,159 — 429,159 — Single issuer trust preferred securities 37,170 — 37,170 — Corporate debt 106,321 — 106,321 — Equity securities 2,578 2,578 — — Total available-for-sale investment securities 2,984,631 3,502 2,981,129 — Derivative instruments 61,147 183 60,964 — Mortgage banking derivatives 819 — 819 — Investments held in Rabbi Trust 5,372 5,372 — — Alternative investments 3,471 — — 3,471 Contingent Consideration 5,331 — — 5,331 Total financial assets held at fair value $ 3,060,771 $ 9,057 $ 3,042,912 $ 8,802 Financial liabilities held at fair value: Derivative instruments $ 40,298 $ 66 $ 40,232 $ — Contingent Liability 6,000 — — 6,000 Total financial liabilities held at fair value $ 46,298 $ 66 $ 40,232 $ 6,000 At December 31, 2014 (In thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets held at fair value: Available-for-sale investment securities: U.S. Treasury Bills $ 525 $ 525 $ — $ — Agency CMO 550,988 — 550,988 — Agency MBS 1,028,518 — 1,028,518 — Agency CMBS 80,266 — 80,266 — Non-agency CMBS 553,393 — 553,393 — CLO 425,734 — 425,734 — Single issuer trust preferred securities 38,245 — 38,245 — Corporate debt 110,301 — 110,301 — Equity securities 5,903 5,903 — — Total available-for-sale investment securities 2,793,873 6,428 2,787,445 — Derivative instruments 52,872 — 52,872 — Mortgage banking derivatives 18 — 18 — Investments held in Rabbi Trust 5,901 5,901 — — Alternative investments 475 — — 475 Total financial assets held at fair value $ 2,853,139 $ 12,329 $ 2,840,335 $ 475 Financial liabilities held at fair value: Derivative instruments $ 36,777 $ 293 $ 36,484 $ — Contingent Liability — — — — Total financial liabilities held at fair value $ 36,777 $ 293 $ 36,484 $ —
Schedule Of Quantitative Inputs And Assumptions For Items Categorized In Level 3 Of The Fair Value Hierarchy	The following table presents the changes in Level 3 assets that are measured at fair value on a recurring basis: Financial Assets (In thousands) Alternative Investments Contingent Consideration Total Contingent Liability Balance at January 1, 2015 $ 475 $ — $ 475 $ — Acquisition — 5,000 5,000 6,000 Unrealized (loss) gain included in net income (170 ) 331 161 — Purchases/capital funding 3,219 — 3,219 — Distributions (53 ) — (53 ) — Balance at December 31, 2015 $ 3,471 $ 5,331 $ 8,802 $ 6,000
Schedule Of Valuation Methodology And Unobservable Inputs	The table below presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2015 : (Dollars in thousands) Asset Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Impaired loans and leases $ 19,644 Real Estate Appraisals Discount for appraisal type 4% - 15% Discount for costs to sell 0% - 8% Other real estate owned $ 652 Real Estate Appraisals Discount for appraisal type 0% - 20% Discount for costs to sell 8% Mortgage servicing assets $ 33,568 Discounted cash flow Constant prepayment rate 7.4% - 32.4% Discount rates 1.4% - 3.4%
Summary Of Estimated Fair Values Of Significant Financial Instruments	The estimated fair values of selected financial instruments are as follows: At December 31, 2015 2014 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Financial Assets: Level 2 Held-to-maturity investment securities $ 3,923,052 $ 3,961,534 $ 3,872,955 $ 3,948,706 Loans held for sale 37,091 37,457 67,952 68,705 Level 3 Loans and leases, net 15,496,745 15,453,892 13,740,761 13,775,850 Mortgage servicing assets (1) 20,698 33,568 19,379 28,690 Alternative investments 12,900 14,294 16,524 18,046 Financial Liabilities: Level 2 Deposit liabilities, other than time deposits $ 15,866,624 $ 15,866,624 $ 13,380,018 $ 13,380,018 Time deposits 2,086,154 2,095,357 2,271,587 2,288,760 Securities sold under agreements to repurchase and other borrowings 1,151,400 1,163,974 1,250,756 1,271,596 Federal Home Loan Bank advances (2) 2,664,139 2,647,872 2,859,431 2,872,515 Long-term debt (3) 226,356 218,143 226,237 227,751 The following adjustments to the carrying amount are not included in the fair value: (1) Mortgage servicing assets is net of reserves of $32 thousand at December 31, 2015 and $23 thousand at December 31, 2014 . (2) FHLB advances is net of unamortized premiums of $24 thousand at December 31, 2015 and $37 thousand at December 31, 2014 . (3) Long-term debt is net of unamortized discounts of $1.0 million at December 31, 2015 and $1.1 million at December 31, 2014 .

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	12 Months Ended
Retirement Benefit Plans (Tables)	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of Defined Benefit Plans Disclosures	The following table sets forth changes in benefit obligation, changes in plan assets, and the funded status of the pension plans and other postretirement benefit plans at December 31: Webster Pension Webster SERP Other Benefits (In thousands) 2015 2014 2015 2014 2015 2014 Change in benefit obligation: Beginning balance $ 210,548 $ 171,189 $ 10,041 $ 8,675 $ 4,133 $ 3,821 Service cost 45 40 — — — — Interest cost 8,008 8,068 345 364 123 139 Actuarial (gain) loss (8,588 ) 38,472 373 1,145 (178 ) 470 Benefits paid and administrative expenses (6,368 ) (7,221 ) (241 ) (143 ) (225 ) (297 ) Ending balance 203,645 210,548 10,518 10,041 3,853 4,133 Change in plan assets: Beginning balance 172,976 162,182 — — — — Actual return on plan assets (5,239 ) 18,015 — — — — Employer contributions — — 241 143 225 297 Benefits paid and administrative expenses (6,368 ) (7,221 ) (241 ) (143 ) (225 ) (297 ) Ending balance 161,369 172,976 — — — — Funded status of the plan at year end $ (42,276 ) $ (37,572 ) $ (10,518 ) $ (10,041 ) $ (3,853 ) $ (4,133 )
Schedule of Amounts Recognized in Balance Sheet	Amounts recognized in the statement of financial position consist of the following: 2015 2014 (In thousands) Webster Pension Webster SERP Other Benefits Webster Pension Webster SERP Other Benefits Accrued expenses and other liabilities $ (42,276 ) $ (10,518 ) $ (3,853 ) $ (37,572 ) $ (10,041 ) $ (4,133 )
Schedule of Net Periodic Benefit Cost Not yet Recognized	Webster expects that $7.2 million in net actuarial loss and $14 thousand in prior service cost will be recognized as components of net periodic benefit cost in 2016 . The components of accumulated other comprehensive loss related to pensions and other postretirement benefits at December 31, 2015 and 2014 are summarized below: 2015 2014 (In thousands) Webster Webster Other Webster Webster Other Net actuarial loss $ 73,238 $ 2,412 $ 591 $ 70,437 $ 2,430 $ 816 Prior service cost — — 14 — — 87 Total pre-tax amounts included in accumulated other comprehensive loss $ 73,238 $ 2,412 $ 605 $ 70,437 $ 2,430 $ 903 Deferred tax benefit 26,447 871 218 25,415 877 326 Amounts included in accumulated other comprehensive loss, net of tax $ 46,791 $ 1,541 $ 387 $ 45,022 $ 1,553 $ 577
Schedule of Expected Benefit Payments	Expected future benefit payments for the pension plans and other postretirement benefit plans are presented below: (In thousands) Webster Pension Webster SERP Other Benefits 2016 $ 7,034 $ 4,015 $ 391 2017 7,785 928 388 2018 8,425 801 380 2019 8,728 5,597 367 2020 9,050 142 349 2021-2025 52,144 679 1,441
Summary of Net Periodic Benefit Cost	The components of the net periodic benefit cost (benefit) for the Company’s defined benefit pension plans were as follows: Years ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 (In thousands) Webster Pension Webster SERP Other Postretirement Benefits Service cost $ 45 $ 40 $ 40 $ — $ — $ — $ — $ — $ — Interest cost on benefit obligations 8,008 8,068 7,365 345 364 289 123 139 109 Expected return on plan assets (11,873 ) (11,495 ) (11,114 ) — — — — — — Amortization of prior service cost — — — — — — 73 73 73 Recognized net loss 5,724 2,781 6,355 390 135 125 47 5 — Net periodic benefit cost (benefit) $ 1,904 $ (606 ) $ 2,646 $ 735 $ 499 $ 414 $ 243 $ 217 $ 182
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)	Changes in funded status related to the Company’s defined benefit pension plans recognized as a component of other comprehensive income in the accompanying Consolidated Statements of Comprehensive Income were as follows: Years ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 (In thousands) Webster Pension Webster SERP Other Postretirement Benefits Net loss (gain) $ 8,525 $ 31,951 $ (23,238 ) $ 372 $ 1,145 $ (160 ) $ (178 ) $ 470 $ (239 ) Amounts reclassified from accumulated other comprehensive income (5,724 ) (2,781 ) (6,355 ) (390 ) (134 ) (125 ) (47 ) (5 ) — Amortization of prior service cost — — — — — — (73 ) (73 ) (73 ) Total loss (gain) recognized in other comprehensive income (loss) $ 2,801 $ 29,170 $ (29,593 ) $ (18 ) $ 1,011 $ (285 ) $ (298 ) $ 392 $ (312 )
Schedule of Changes in Fair Value of Plan Assets	A summary of the fair value and hierarchy classification of financial assets of the pension plan is as follows: At December 31, 2015 2014 (In thousands) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Registered investment companies: Exchange traded funds $ 28,329 $ 28,329 $ — $ — $ 28,287 $ 28,287 $ — $ — Cash and cash equivalents 295 295 — — 871 871 — — Common collective funds: Fixed Income funds 80,783 — 80,783 — 94,928 — 94,928 — Equity Funds 51,028 — 51,028 — 47,813 — 47,813 — Insurance company investment contract 934 — — 934 1,077 — — 1,077 Total $ 161,369 $ 28,624 $ 131,811 $ 934 $ 172,976 $ 29,158 $ 142,741 $ 1,077
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets	The following table sets forth a summary of changes in the fair value of Level 3 assets of the pension plan: Years ended December 31, (In thousands) 2015 2014 Beginning balance $ 1,077 $ 1,196 Unrealized gains relating to instruments still held at the reporting date (28 ) (2 ) Benefit payments, administrative expenses, and interest income, net (115 ) (117 ) Ending balance $ 934 $ 1,077
Schedule of Allocation of Plan Assets	The following table presents the target allocation and the pension plan asset allocation for the periods indicated, by asset category: Target Allocation Percentage of plan assets 2016 2015 2014 Fixed income investments 50 % 51 % 56 % Equity investments 50 49 44 Total 100 % 100 % 100 %
Schedule of Assumptions Used	Weighted-average assumptions used to determine benefit obligations at December 31 are as follows: Webster Pension Webster SERP Other Benefits 2015 2014 2015 2014 2015 2014 Discount rate 4.20 % 3.85 % 3.75 % 3.50 % 3.35 % 3.15 % Rate of compensation increase n/a n/a n/a n/a n/a n/a Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31 are as follows: Webster Pension Webster SERP Other Benefits 2015 2014 2013 2015 2014 2013 2015 2014 2013 Discount rate 3.85 % 4.80 % 3.90 % 3.50 % 4.25 % 3.40 % 3.15 % 3.75 % 2.85 % Expected long-term return on assets 7.00 % 7.25 % 7.50 % n/a n/a n/a n/a n/a n/a Rate of compensation increase n/a n/a n/a n/a n/a n/a n/a n/a n/a Assumed healthcare cost trend n/a n/a n/a n/a n/a n/a 8.0 % 8.0 % 8.0 %
Schedule of Multiemployer Plans	The following table sets forth contributions and funding status of the Fund: (In thousands) Contributions by Webster Bank Funded Status of Plan EIN/Pension Plan Number 2015 2014 2013 2015 2014 13-5645888/333 $340 $765 $870 At least 80 percent At least 80 percent

Share-Based Plans (Tables)

Share-Based Plans (Tables)	12 Months Ended
Share-Based Plans (Tables)	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Allocation of Stock-based Compensation Expense and Related Tax Benefit	The following table provides a summary of stock compensation expense, and the related income tax benefit, recognized in the accompanying Consolidated Statements of Income: Years ended December 31, (In thousands) 2015 2014 2013 Stock options $ 379 $ 1,175 $ 3,902 Restricted stock 10,556 9,048 6,762 Total stock compensation expense $ 10,935 $ 10,223 $ 10,664 Income tax benefit $ 3,903 $ 3,553 $ 5,344
Schedule of Unrecognized Stock-based Compensation Expense	The following table provides a summary of unrecognized stock compensation expense: At December 31, 2015 (Dollars in thousands) Unrecognized Compensation Expense Weighted-Average Period To Be Recognized Stock options $ 43 0.1 years Restricted stock $ 10,937 1.9 years
Summary of Restricted Stock and Stock Option Activity	The following table provides a summary of the activity under the Plans for the year ended December 31, 2015 : Unvested Restricted Stock Awards Stock Options Outstanding Time-Based Performance-Based Number of Shares Weighted-Average Grant Date Fair Value Number of Units Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Exercise Price Balance at January 1, 2015 243,015 $ 27.03 2,279 $ 29.34 130,193 $ 28.61 1,900,144 $ 24.95 Granted 223,190 34.82 12,531 34.45 138,591 36.15 — — Exercised options — — — — — — (221,320 ) 18.09 Vested restricted stock awards (1) (220,866 ) 28.83 (12,722 ) 33.53 (153,063 ) 31.27 — — Forfeited (9,194 ) 30.27 — — — — (151,750 ) 45.36 Balance at December 31, 2015 236,145 $ 32.58 2,088 $ 34.45 115,721 $ 34.14 1,527,074 $ 23.92 Options exercisable, at December 31, 2015 1,420,758 $ 23.99 Options expected to vest, at December 31, 2015 105,378 $ 23.00 (1) Vested for purposes of recording compensation expense.
Summary of Options Outstanding and Options Exercisable	The following table summarizes information about options outstanding and options exercisable at December 31, 2015 : Options Outstanding Options Exercisable Range of Exercise Prices Number of Shares Weighted-Average Remaining Contractual Life (years) Weighted-Average Exercise Price Number of Shares Weighted-Average Remaining Contractual Life (years) Weighted-Average Exercise Price $ 5.14 - 20.00 448,941 3.2 $ 9.67 448,941 3.2 $ 9.67 $ 20.01 - 30.00 672,339 6.1 23.54 566,023 5.9 23.65 $ 30.01 - 40.00 192,518 2.0 32.03 192,518 2.0 32.03 $ 40.01 - 48.88 213,276 1.0 47.77 213,276 1.0 47.77 1,527,074 4.0 $ 23.92 1,420,758 3.8 $ 23.99

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
Segment Reporting (Tables)	Dec. 31, 2015
Segment Reporting [Abstract]
Operating Results And Total Assets Reportable Segments	The following tables present the results for Webster’s reportable segments and the Corporate and Reconciling category, which incorporates the allocation of the provision for loan and lease losses and income tax expense: Year ended December 31, 2015 (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated Net interest income (loss) $ 255,845 $ 354,709 $ 73,433 $ 10,240 $ (29,602 ) $ 664,625 Provision (benefit) for loan and lease losses 30,160 19,603 — 386 (849 ) 49,300 Net interest income (loss) after provision for loan and lease losses 225,685 335,106 73,433 9,854 (28,753 ) 615,325 Non-interest income 37,784 108,604 64,243 9,183 19,731 239,545 Non-interest expense 109,718 330,692 80,662 19,781 13,701 554,554 Income (loss) before income tax expense 153,751 113,018 57,014 (744 ) (22,723 ) 300,316 Income tax expense (benefit) 48,112 35,366 17,841 (233 ) (7,110 ) 93,976 Net income (loss) $ 105,639 $ 77,652 $ 39,173 $ (511 ) $ (15,613 ) $ 206,340 Year ended December 31, 2014 (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated Net interest income (loss) $ 238,186 $ 354,781 $ 38,822 $ 8,877 $ (12,225 ) $ 628,441 Provision (benefit) for loan and lease losses 13,088 26,345 — 765 (2,948 ) 37,250 Net interest income (loss) after provision for loan and lease losses 225,098 328,436 38,822 8,112 (9,277 ) 591,191 Non-interest income 37,270 103,543 28,553 9,843 22,899 202,108 Non-interest expense 102,374 324,312 40,900 18,691 15,323 501,600 Income (loss) before income tax expense 159,994 107,667 26,475 (736 ) (1,701 ) 291,699 Income tax expense (benefit) 50,446 33,947 8,311 (232 ) (499 ) 91,973 Net income (loss) $ 109,548 $ 73,720 $ 18,164 $ (504 ) $ (1,202 ) $ 199,726 Year ended December 31, 2013 (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated Net interest income $ 217,582 $ 347,395 $ 32,807 $ 8,185 $ (9,241 ) $ 596,728 Provision (benefit) for loan and lease losses 17,971 19,219 — 397 (4,087 ) 33,500 Net interest income after provision for loan and lease losses 199,611 328,176 32,807 7,788 (5,154 ) 563,228 Non-interest income 30,797 116,182 21,963 10,963 11,145 191,050 Non-interest expense 99,801 337,795 29,962 19,783 10,368 497,709 Income before income tax expense 130,607 106,563 24,808 (1,032 ) (4,377 ) 256,569 Income tax expense 39,260 32,029 7,423 (310 ) (1,289 ) 77,113 Net income (loss) $ 91,347 $ 74,534 $ 17,385 $ (722 ) $ (3,088 ) $ 179,456 Total Assets (In thousands) Commercial Community Banking HSA Bank Private Banking Corporate and Consolidated At December 31, 2015 $ 7,505,513 $ 8,441,950 $ 95,815 $ 493,571 $ 8,140,971 $ 24,677,820 At December 31, 2014 6,550,868 8,123,928 26,680 398,893 7,432,803 22,533,172 At December 31, 2013 5,682,129 7,738,597 19,524 346,338 7,066,557 20,853,145

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments and Receipts for Leases	The following table summarizes future minimum rental payments and receipts under lease agreements, including the greater Boston locations acquired through Citigroup Inc.: At December 31, 2015 (In thousands) Rental Payments Rental Receipts 2016 $ 25,218 $ 690 2017 23,140 422 2018 18,998 248 2019 17,227 147 2020 15,561 89 Thereafter 84,114 84 Total future minimum rental payments and receipts $ 184,258 $ 1,680
Outstanding Financial Instruments Contract Amounts Represent Credit Risk	The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk: At December 31, (In thousands) 2015 2014 Commitments to extend credit $ 4,851,994 $ 4,376,733 Standby letter of credit 133,294 142,964 Commercial letter of credit 45,742 27,787 Total credit-related financial instruments with off-balance sheet risk $ 5,031,030 $ 4,547,484
Reserve For Unfunded Credit Commitments	The following table provides a summary of activity in the reserve for unfunded credit commitments: Years ended December 31, (In thousands) 2015 2014 2013 Beginning balance $ 5,151 $ 4,384 $ 5,662 (Benefit) provision (3,032 ) 767 (1,278 ) Ending balance $ 2,119 $ 5,151 $ 4,384

Parent Company Information (Tab

Parent Company Information (Tables)	12 Months Ended
Parent Company Information (Tables)	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Parent Company Information Balance Sheet	Condensed Balance Sheets December 31, (In thousands) 2015 2014 Assets: Cash and due from banks $ 279,644 $ 272,492 Securities available for sale, at fair value 2,578 5,902 Investment in subsidiaries 2,347,068 2,249,910 Due to subsidiaries (48 ) (165 ) Alternative investments 6,795 10,046 Other assets 16,359 14,356 Total assets $ 2,652,396 $ 2,552,541 Liabilities and shareholders’ equity: Senior notes $ 149,036 $ 148,917 Junior subordinated debt 77,320 77,320 Accrued interest payable 2,591 2,582 Other liabilities 7,878 907 Total liabilities 236,825 229,726 Shareholders’ equity 2,415,571 2,322,815 Total liabilities and shareholders’ equity $ 2,652,396 $ 2,552,541
Schedule of Parent Company Information Income Statement	Condensed Statements of Income Years ended December 31, (In thousands) 2015 2014 2013 Operating Income: Dividend income from bank subsidiary $ 110,000 $ 100,000 $ 90,000 Interest on securities and interest-bearing deposits 546 613 1,025 Gain on sale of investment securities, net — 1,185 1,273 Alternative investments income (loss) 2,274 804 (392 ) Other non-interest income 152 151 152 Total operating income 112,972 102,753 92,058 Operating Expense: Interest expense on borrowings 9,665 10,041 7,273 Compensation and benefits 10,965 10,290 10,787 Other non-interest expense 6,005 4,562 5,966 Total operating expense 26,635 24,893 24,026 Income before income tax benefit and equity in undistributed earnings of subsidiaries and associated companies 86,337 77,860 68,032 Income tax benefit 2,929 8,798 9,742 Equity in undistributed earnings of subsidiaries and associated companies 117,074 113,068 101,682 Net income $ 206,340 $ 199,726 $ 179,456
Schedule of Parent Company Information Comprehensive Income Statement	Condensed Statements of Comprehensive Income Years ended December 31, (In thousands) 2015 2014 2013 Net income $ 206,340 $ 199,726 $ 179,456 Other comprehensive loss, net of tax: Net unrealized (losses) gains on available for sale securities (2,109 ) 725 (616 ) Net unrealized gains (losses) on derivative instruments 1,223 (2,932 ) 1,152 Other comprehensive loss of subsidiaries and associated companies (20,959 ) (5,505 ) (16,819 ) Other comprehensive loss, net of tax (21,845 ) (7,712 ) (16,283 ) Comprehensive income $ 184,495 $ 192,014 $ 163,173
Schedule of Parent Company Information Cash Flow Statement	Condensed Statements of Cash Flows Years ended December 31, (In thousands) 2015 2014 2013 Operating activities: Net income $ 206,340 $ 199,726 $ 179,456 Adjustments to reconcile income from continuing operations to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries and associated companies (117,074 ) (113,068 ) (101,682 ) Stock-based compensation 10,935 10,223 10,664 Other, net 9,066 (10,721 ) (1,934 ) Net cash provided by operating activities 109,267 86,160 86,504 Investing activities: Purchases of available for sale securities — (3,500 ) (75 ) Proceeds from sale of available for sale securities — 3,499 13,544 Net cash (used for) provided by investing activities — (1 ) 13,469 Financing activities: Issuance of long-term debt — 150,000 — Repayment of long-term debt — (150,000 ) — Cash dividends paid to common shareholders (80,964 ) (67,431 ) (48,952 ) Cash dividends paid to preferred shareholders (8,711 ) (10,556 ) (10,803 ) Exercise of stock options 3,060 2,221 2,736 Excess tax benefits from stock-based compensation 2,338 1,161 389 Common stock issued — 435 731 Common stock repurchased/shares acquired related to employee share-based plans (17,815 ) (13,067 ) (672 ) Common stock warrants repurchased (23 ) (3 ) (30 ) Net cash used for financing activities (102,115 ) (87,240 ) (56,601 ) Increase (decrease) in cash and due from banks 7,152 (1,081 ) 43,372 Cash and due from banks at beginning of year 272,492 273,573 230,201 Cash and due from banks at end of year $ 279,644 $ 272,492 $ 273,573

Selected Quarterly Consolidat52

Selected Quarterly Consolidated Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information	2015 (In thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Interest income $ 182,912 $ 186,970 $ 191,998 $ 198,160 Interest expense 23,148 23,459 23,988 24,820 Net interest income 159,764 163,511 168,010 173,340 Provision for loan and lease losses 9,750 12,750 13,000 13,800 Non-interest income (less securities amounts) 57,847 59,365 61,537 60,297 Gain on sale of investment securities, net 43 486 — 80 Impairment loss recognized in earnings — — (82 ) (28 ) Non-interest expense 134,090 137,446 139,854 143,164 Income before income tax expense 73,814 73,166 76,611 76,725 Income tax expense 24,092 20,663 25,075 24,146 Net income $ 49,722 $ 52,503 $ 51,536 $ 52,579 Earnings applicable to common shareholders $ 46,937 $ 50,277 $ 49,341 $ 50,414 Earnings per common share: Basic $ 0.52 $ 0.55 $ 0.54 $ 0.55 Diluted 0.52 0.55 0.54 0.55 2014 (In thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Interest income $ 177,779 $ 177,497 $ 179,914 $ 183,751 Interest expense 22,478 22,375 22,544 23,103 Net interest income 155,301 155,122 157,370 160,648 Provision for loan and lease losses 9,000 9,250 9,500 9,500 Non-interest income (less securities amounts) 45,580 47,669 50,952 53,553 Gain on sale of investment securities, net 4,336 — 42 1,121 Impairment loss recognized in earnings (88 ) (73 ) (85 ) (899 ) Non-interest expense 124,463 122,475 124,498 130,164 Income before income tax expense 71,666 70,993 74,281 74,759 Income tax expense 21,237 23,159 23,824 23,753 Net income $ 50,429 $ 47,834 $ 50,457 $ 51,006 Earnings applicable to common shareholders $ 47,617 $ 45,008 $ 47,647 $ 48,224 Earnings per common share: Basic $ 0.53 $ 0.50 $ 0.53 $ 0.54 Diluted 0.53 0.50 0.53 0.53

Summary of Significant Accoun53

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Loans) (Detail)	12 Months Ended
	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Minimum Number Of Days To Be Considered Past Due	90 days
Financing Receivable, 90 Days Past Due and Still Accruing	90 days
Threshold Period Past Due for Write-off of Financing Receivable (in days)	180 days
Minimum Period Troubled Debt Restructurings Placed On Non Accrual Status (in months)	6 months
Minimum Performance Period for TDR to return to Accrual Status (in months)	6 months
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Minimum Number Of Days To Be Considered Past Due	90 days
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Minimum Number Of Days To Be Considered Past Due	90 days
Other Real Estate Owned [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Threshold Period Past Due for Write-off of Financing Receivable (in days)	90 days

Summary of Significant Accoun54

Summary of Significant Accounting Policies Significant Accounting Policies (Narrative) (Premises and Equipment) (Detail) (Details)	12 Months Ended
	Dec. 31, 2015
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Leasehold Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Data Processing and Software [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Data Processing and Software [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years

Summary of Significant Accoun55

Summary of Significant Accounting Policies (Share Based Compensation) (Narrative) (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Performance Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Share-based Compensation Award, Tranche One [Member] \| Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%	0.00%
Share-based Compensation Award, Tranche One [Member] \| Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%	150.00%
Share-based Compensation Award, Tranche Two [Member] \| Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Share-based Compensation Award, Tranche Two [Member] \| Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%

Acquisition (Acquisition-date F

Acquisition (Acquisition-date Fair Value of Consideration) (Detail) $ in Thousands	Jan. 13, 2015USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash	$ 50,485
Contingent consideration	(5,000)	[1]
Total net consideration transferred	$ 45,485

[1]	The contingent consideration entitles the Company to receive a rebate of the premium paid for account attrition that occurs during the eighteen-month period beginning on January 13, 2015, the closing date of the transaction.

Acquisition (Estimated Fair Val

Acquisition (Estimated Fair Values of Assets and Liabilities) (Details) - USD ($) $ in Thousands		Jan. 13, 2015	Dec. 31, 2015
Business Combinations [Abstract]
Cash		$ 1,446,898
Intangible assets		43,000
Total identifiable assets acquired		1,489,898
Deposits		1,446,899
Contingent liability	[1]	6,000
Total liabilities assumed		1,452,899
Net identifiable assets acquired		36,999
Goodwill		8,486	$ 8,486
Net assets acquired		$ 45,485

[1]	The contingent liability represents an obligation that existed at the acquisition date. Accordingly, Webster assumed the contingent liability as part of the transaction and has accounted for it at fair value.

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Amortized Cost	$ 2,994,924	$ 2,767,967
Unrealized Gains	22,997	44,649
Unrealized Losses	(33,290)	(18,743)
Fair Value	2,984,631	2,793,873
Held-to-maturity Securities [Abstract]
Amortized Cost	3,923,052	3,872,955
Unrealized Gains	63,894	90,043
Unrealized Losses	(25,412)	(14,292)
Fair Value	3,961,534	3,948,706
US Treasury Bill Securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	924	525
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	924	525
Agency collateralized mortgage obligations (agency CMO) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	546,168	543,417
Unrealized Gains	5,532	8,636
Unrealized Losses	(2,946)	(1,065)
Fair Value	548,754	550,988
Held-to-maturity Securities [Abstract]
Amortized Cost	407,494	442,129
Unrealized Gains	3,717	6,584
Unrealized Losses	(2,058)	(739)
Fair Value	409,153	447,974
Agency mortgage-backed securities (agency MBS) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	1,075,941	1,030,724
Unrealized Gains	6,459	10,462
Unrealized Losses	(17,291)	(12,668)
Fair Value	1,065,109	1,028,518
Held-to-maturity Securities [Abstract]
Amortized Cost	2,030,176	2,134,319
Unrealized Gains	38,813	57,196
Unrealized Losses	(19,908)	(11,340)
Fair Value	2,049,081	2,180,175
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	215,670	80,400
Unrealized Gains	639	0
Unrealized Losses	(959)	(134)
Fair Value	215,350	80,266
Held-to-maturity Securities [Abstract]
Amortized Cost	686,086	578,687
Unrealized Gains	4,253	1,597
Unrealized Losses	(325)	(1,143)
Fair Value	690,014	579,141
Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	574,686	534,631
Unrealized Gains	7,485	18,885
Unrealized Losses	(2,905)	(123)
Fair Value	579,266	553,393
Held-to-maturity Securities [Abstract]
Amortized Cost	360,018	338,723
Unrealized Gains	5,046	9,428
Unrealized Losses	(2,704)	(1,015)
Fair Value	362,360	347,136
Collateralized loan obligations (CLO) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	431,837	426,269
Unrealized Gains	592	482
Unrealized Losses	(3,270)	(1,017)
Fair Value	429,159	425,734
Single issuer trust preferred securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	42,168	41,981
Unrealized Gains	0	0
Unrealized Losses	(4,998)	(3,736)
Fair Value	37,170	38,245
Corporate debt securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	104,031	106,520
Unrealized Gains	2,290	3,781
Unrealized Losses	0	0
Fair Value	106,321	110,301
Equity securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	3,499	3,500
Unrealized Gains	0	2,403
Unrealized Losses	(921)	0
Fair Value	2,578	5,903
Municipal bonds and notes [Member]
Held-to-maturity Securities [Abstract]
Amortized Cost	435,905	373,211
Unrealized Gains	12,019	15,138
Unrealized Losses	(417)	(55)
Fair Value	447,507	388,294
Private Label MBS [Member]
Held-to-maturity Securities [Abstract]
Amortized Cost	3,373	5,886
Unrealized Gains	46	100
Unrealized Losses	0	0
Fair Value	$ 3,419	$ 5,986

Investment Securities (Other Th

Investment Securities (Other Than Temporary Impairment Credit Losses Recognized In Earnings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance of OTTI, beginning of period	$ 3,696	$ 16,633	$ 10,460
Reduction for securities sold, called	(518)	(14,082)	(1,104)
Additions for OTTI not previously recognized	110	1,145	7,277
Balance of OTTI, end of period	$ 3,288	$ 3,696	$ 16,633

Investment Securities (Summar60

Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Detail) $ in Thousands	Dec. 31, 2015USD ($)holding	Dec. 31, 2014USD ($)holding
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	$ 1,295,959	$ 259,477
Available for sale, Unrealized Losses - Less Than Twelve Months	(16,177)	(1,562)
Available for sale, Fair Value - Twelve Months or Longer	446,123	720,814
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (17,113)	$ (17,181)
Available for sale, Number of Holdings - Total \| holding	156	94
Available for sale, Fair Value - Total	$ 1,742,082	$ 980,291
Available for sale, Unrealized Losses - Total	(33,290)	(18,743)
Held-to-maturity, Fair Value - Less Than Twelve Months	977,562	415,701
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(10,831)	(1,469)
Held-to-maturity, Fair Value - Twelve Months or Longer	542,714	702,497
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (14,581)	$ (12,823)
Held-to-maturity, Number of Holdings - Total \| holding	152	89
Held-to-maturity, Fair Value - Total	$ 1,520,276	$ 1,118,198
Held-to-maturity, Unrealized Losses - Total	(25,412)	(14,292)
Agency collateralized mortgage obligations (agency CMO) [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	195,369	47,217
Available for sale, Unrealized Losses - Less Than Twelve Months	(2,195)	(240)
Available for sale, Fair Value - Twelve Months or Longer	26,039	35,968
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (751)	$ (825)
Available for sale, Number of Holdings - Total \| holding	14	8
Available for sale, Fair Value - Total	$ 221,408	$ 83,185
Available for sale, Unrealized Losses - Total	(2,946)	(1,065)
Held-to-maturity, Fair Value - Less Than Twelve Months	143,364	52,172
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(1,304)	(187)
Held-to-maturity, Fair Value - Twelve Months or Longer	27,928	24,942
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (754)	$ (552)
Held-to-maturity, Number of Holdings - Total \| holding	13	6
Held-to-maturity, Fair Value - Total	$ 171,292	$ 77,114
Held-to-maturity, Unrealized Losses - Total	(2,058)	(739)
Agency mortgage-backed securities (agency MBS) [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	481,839	3,691
Available for sale, Unrealized Losses - Less Than Twelve Months	(6,386)	(18)
Available for sale, Fair Value - Twelve Months or Longer	351,911	641,355
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (10,905)	$ (12,650)
Available for sale, Number of Holdings - Total \| holding	84	64
Available for sale, Fair Value - Total	$ 833,750	$ 645,046
Available for sale, Unrealized Losses - Total	(17,291)	(12,668)
Held-to-maturity, Fair Value - Less Than Twelve Months	551,918	20,791
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(7,089)	(86)
Held-to-maturity, Fair Value - Twelve Months or Longer	470,828	608,568
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (12,819)	$ (11,254)
Held-to-maturity, Number of Holdings - Total \| holding	87	44
Held-to-maturity, Fair Value - Total	$ 1,022,746	$ 629,359
Held-to-maturity, Unrealized Losses - Total	(19,908)	(11,340)
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	124,241	80,266
Available for sale, Unrealized Losses - Less Than Twelve Months	$ (959)	$ (134)
Available for sale, Number of Holdings - Total \| holding	7	4
Available for sale, Fair Value - Total	$ 124,241	$ 80,266
Available for sale, Unrealized Losses - Total	(959)	(134)
Held-to-maturity, Fair Value - Less Than Twelve Months	110,864	324,394
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	$ (325)	$ (1,143)
Held-to-maturity, Number of Holdings - Total \| holding	7	17
Held-to-maturity, Fair Value - Total	$ 110,864	$ 324,394
Held-to-maturity, Unrealized Losses - Total	(325)	(1,143)
Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	276,330	24,932
Available for sale, Unrealized Losses - Less Than Twelve Months	(2,879)	(117)
Available for sale, Fair Value - Twelve Months or Longer	19,382	9,396
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (26)	$ (6)
Available for sale, Number of Holdings - Total \| holding	29	4
Available for sale, Fair Value - Total	$ 295,712	$ 34,328
Available for sale, Unrealized Losses - Total	(2,905)	(123)
Held-to-maturity, Fair Value - Less Than Twelve Months	142,382	13,003
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(1,983)	(30)
Held-to-maturity, Fair Value - Twelve Months or Longer	30,129	65,913
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (721)	$ (985)
Held-to-maturity, Number of Holdings - Total \| holding	18	7
Held-to-maturity, Fair Value - Total	$ 172,511	$ 78,916
Held-to-maturity, Unrealized Losses - Total	(2,704)	(1,015)
Collateralized loan obligations (CLO) [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	211,515	99,221
Available for sale, Unrealized Losses - Less Than Twelve Months	(2,709)	$ (1,017)
Available for sale, Fair Value - Twelve Months or Longer	15,708
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (561)
Available for sale, Number of Holdings - Total \| holding	13	6
Available for sale, Fair Value - Total	$ 227,223	$ 99,221
Available for sale, Unrealized Losses - Total	(3,270)	(1,017)
Single issuer trust preferred securities [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	4,087	4,150
Available for sale, Unrealized Losses - Less Than Twelve Months	(128)	(36)
Available for sale, Fair Value - Twelve Months or Longer	33,083	34,095
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (4,870)	$ (3,700)
Available for sale, Number of Holdings - Total \| holding	8	8
Available for sale, Fair Value - Total	$ 37,170	$ 38,245
Available for sale, Unrealized Losses - Total	(4,998)	(3,736)
Equity Securities [Member]
Schedule of Investments [Line Items]
Available for Sale, Fair Value - Less Than Twelve Months	2,578
Available for sale, Unrealized Losses - Less Than Twelve Months	$ (921)
Available for sale, Number of Holdings - Total \| holding	1
Available for sale, Fair Value - Total	$ 2,578
Available for sale, Unrealized Losses - Total	(921)
Municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Fair Value - Less Than Twelve Months	29,034	5,341
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(130)	(23)
Held-to-maturity, Fair Value - Twelve Months or Longer	13,829	3,074
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (287)	$ (32)
Held-to-maturity, Number of Holdings - Total \| holding	27	15
Held-to-maturity, Fair Value - Total	$ 42,863	$ 8,415
Held-to-maturity, Unrealized Losses - Total	$ (417)	$ (55)

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Gross Unrealized Losses	$ (33,290)	$ (18,743)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(25,412)	(14,292)
Securities available-for-sale, at fair value	2,984,631	2,793,873
Pledged Financial Instruments, Not Separately Reported, Securities	2,600,000	2,900,000
Agency collateralized mortgage obligations (agency CMO) [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(2,946)	(1,065)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(2,058)	(739)
Securities available-for-sale, at fair value	548,754	550,988
Agency mortgage-backed securities (agency MBS) [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(17,291)	(12,668)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(19,908)	(11,340)
Securities available-for-sale, at fair value	1,065,109	1,028,518
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(959)	(134)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(325)	(1,143)
Securities available-for-sale, at fair value	215,350	80,266
Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(2,905)	(123)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(2,704)	(1,015)
Securities available-for-sale, at fair value	579,266	553,393
Collateralized loan obligations (CLO) [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(3,270)	(1,017)
Securities available-for-sale, at fair value	429,159	425,734
Single issuer trust preferred securities [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(4,998)	(3,736)
Securities available-for-sale, at fair value	37,170	38,245
Equity securities [Member]
Schedule of Investments [Line Items]
Gross Unrealized Losses	(921)	0
Securities available-for-sale, at fair value	2,578	5,903
Municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(417)	$ (55)
Callable at the option of the counterparty [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, at fair value	$ 961,600

Investment Securities (Summar62

Investment Securities (Summary Of Sale Proceeds Of Available For Sale Securities) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 95,101	$ 126,580	$ 57,804
Gains	1,029	7,268	2,847
Losses	420	1,769	2,135
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 609	$ 5,499	$ 712

Investment Securities (Summar63

Investment Securities (Summary Of Debt Securities By Contractual Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 35,941
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	99,028
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	435,444
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	2,421,012
Available-for-sale Debt Securities, Amortized Cost Basis	2,991,425
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	35,660
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	101,313
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	433,733
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	2,411,347
Available for Sale, Fair Value - Total debt securities	2,982,053
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	320
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	33,940
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	48,818
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,839,974
Amortized Cost	3,923,052	$ 3,872,955
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	323
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	34,880
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	50,534
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,875,797
Held-to-maturity Securities, Fair Value	$ 3,961,534	$ 3,948,706

Loans and Leases (Detail)

Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 15,671,735	[1],[2]	$ 13,900,025	[1],[2]	$ 12,699,776
Unamortized premiums	18,000		10,600
Interest Receivable	43,100		38,400
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	4,061,001		3,509,175	[3]	3,361,425
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	2,702,560		2,549,401		2,536,688
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	4,315,999		3,749,270		3,282,851
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	3,991,649		3,554,428		3,058,362
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 600,526		$ 537,751		$ 460,450

[1]	Accrued interest of $43.1 million and $38.4 million at December 31, 2015 and December 31, 2014, respectively, are not included in the loan and lease balances.
[2]	Loan and lease balances include net deferred fees and unamortized premiums of $18.0 million and $10.6 million at December 31, 2015 and December 31, 2014, respectively.
[3]	U.S. Government guaranteed loans of approximately $2.0 million were reclassified from non-accrual to over 90 days past due and accruing reflective of a policy change effective in the first quarter of 2015.

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) $ in Millions	3 Months Ended	12 Months Ended
Loans and Leases (Narrative) (Detail) $ in Millions	Dec. 31, 2015USD ($)grade	Dec. 31, 2015USD ($)grade	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Loans and Leases Receivable Disclosure [Abstract]
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral	$ 6,100	$ 6,100
Interest on non-accrual loans that would have been recorded as additional interest income	$ 8.2		$ 9.3	$ 11.4
Number of Grades \| grade	10	10
Write-down of TDR's		$ (11.8)	$ (13.5)	$ (24.4)

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015		Mar. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	$ 179,403	[1]		$ 172,587	[2]
90 or More Days Past Due and Accruing	2,051			2,087
Non-accrual	140,069			130,148
Current	15,492,332			13,727,438
Total Loans and Leases	15,671,735	[3],[4]		13,900,025	[3],[4]	$ 12,699,776
Interest Receivable	43,100			38,400
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	71,298	[1]		83,406	[2],[5]
90 or More Days Past Due and Accruing	2,029		$ 2,000	2,039	[5]
Non-accrual	54,201			64,117	[5]
Current	3,989,703			3,425,769	[5]
Total Loans and Leases	4,061,001			3,509,175	[5]	3,361,425
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	2,702,560			2,549,401		2,536,688
Consumer Portfolio Segment [Member] \| Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	2,565	[1]		1,395	[2]
90 or More Days Past Due and Accruing	0			0
Non-accrual	560			281
Current	246,597			74,236
Total Loans and Leases	249,162			75,631
Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	50,640	[1]		56,495	[2]
90 or More Days Past Due and Accruing	0			0
Non-accrual	37,337			40,026
Current	2,402,758			2,417,275
Total Loans and Leases	2,453,398			2,473,770
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	4,315,999			3,749,270		3,282,851
Commercial Portfolio Segment [Member] \| Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	31,115	[1]		8,598	[2]
90 or More Days Past Due and Accruing	22			48
Non-accrual	27,037			6,449
Current	3,531,669			3,079,342
Total Loans and Leases	3,562,784			3,087,940
Commercial Portfolio Segment [Member] \| Asset Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	0	[1]		0	[2]
90 or More Days Past Due and Accruing	0			0
Non-accrual	0			0
Current	753,215			661,330
Total Loans and Leases	753,215			661,330
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	3,991,649			3,554,428		3,058,362
Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	19,016	[1]		17,755	[2]
90 or More Days Past Due and Accruing	0			0
Non-accrual	16,767			15,038
Current	3,673,408			3,302,652
Total Loans and Leases	3,692,424			3,320,407
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	3,461	[1]		3,659	[2]
90 or More Days Past Due and Accruing	0			0
Non-accrual	3,461			3,659
Current	295,764			230,362
Total Loans and Leases	299,225			234,021
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	1,308	[1]		1,279	[2]
90 or More Days Past Due and Accruing	0			0
Non-accrual	706			578
Current	599,218			536,472
Total Loans and Leases	600,526			537,751		$ 460,450
30 days or more days past due and accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Receivable	600			500
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	23,751			28,331
Financing Receivables, 30 to 59 Days Past Due [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	10,365			11,410	[5]
Financing Receivables, 30 to 59 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	1,390			704
Financing Receivables, 30 to 59 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	9,061			11,393
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	768			1,948
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Asset Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	0			0
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	1,624			2,325
Financing Receivables, 30 to 59 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	0			0
Financing Receivables, 30 to 59 Days Past Due [Member] \| Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	543			551
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	13,532			12,021
Financing Receivables, 60 to 89 Days Past Due [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	4,703			5,840	[5]
Financing Receivables, 60 to 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	615			410
Financing Receivables, 60 to 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	4,242			5,076
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	3,288			153
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Asset Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	0			0
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	625			392
Financing Receivables, 60 to 89 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	0			0
Financing Receivables, 60 to 89 Days Past Due [Member] \| Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Non-accrual(1)	$ 59			$ 150

[1]	At December 31, 2015(In thousands)30-59 DaysPast Due andAccruing60-89 DaysPast Due andAccruing90 or More Days Past Dueand AccruingNon-accrualTotal Past Due and Non-accrual(1)CurrentTotal Loansand LeasesResidential $10,365$4,703$2,029$54,201$71,298$3,989,703$4,061,001Consumer: Home equity 9,0614,242—37,33750,6402,402,7582,453,398Other consumer1,390615—5602,565246,597249,162Commercial: Commercial non-mortgage7683,2882227,03731,1153,531,6693,562,784Asset-based—————753,215753,215Commercial real estate: Commercial real estate1,624625—16,76719,0163,673,4083,692,424Commercial construction———3,4613,461295,764299,225Equipment financing54359—7061,308599,218600,526Total$23,751$13,532$2,051$140,069$179,403$15,492,332$15,671,735
[2]	Loans and leases 30 days or more days past due and accruing exclude $0.6 million and $0.5 million of accrued interest receivable at December 31, 2015 and December 31, 2014, respectively.
[3]	Accrued interest of $43.1 million and $38.4 million at December 31, 2015 and December 31, 2014, respectively, are not included in the loan and lease balances.
[4]	Loan and lease balances include net deferred fees and unamortized premiums of $18.0 million and $10.6 million at December 31, 2015 and December 31, 2014, respectively.
[5]	U.S. Government guaranteed loans of approximately $2.0 million were reclassified from non-accrual to over 90 days past due and accruing reflective of a policy change effective in the first quarter of 2015.

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period					$ 159,264					$ 152,573	$ 159,264		$ 152,573		$ 177,129
Provision (benefit) charged to expense	$ 13,800		$ 13,000	$ 12,750	9,750	$ 9,500		$ 9,500	$ 9,250	9,000	49,300		37,250		33,500
Losses charged off											(43,560)		(44,426)		(75,459)
Recoveries											9,986		13,867		17,403
Balance, end of period	174,990					159,264					174,990		159,264		152,573
Individually evaluated for impairment	22,204					25,301					22,204		25,301		20,453
Collectively evaluated for impairment	152,786					133,963					152,786		133,963		132,120
Individually evaluated for impairment	279,171					330,856					279,171		330,856		351,541
Collectively evaluated for impairment	15,392,564					13,569,169					15,392,564		13,569,169		12,348,235
Total Loans and Leases	15,671,735	[1],[2]				13,900,025	[1],[2]				15,671,735	[1],[2]	13,900,025	[1],[2]	12,699,776
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period					25,452					23,027	25,452		23,027		32,030
Provision (benefit) charged to expense											6,057		7,315		1,187
Losses charged off											(6,508)		(6,214)		(11,592)
Recoveries											875		1,324		1,402
Balance, end of period	25,876					25,452					25,876		25,452		23,027
Individually evaluated for impairment	10,364					12,094					10,364		12,094		10,535
Collectively evaluated for impairment	15,512					13,358					15,512		13,358		12,492
Individually evaluated for impairment	134,448					141,982					134,448		141,982		142,413
Collectively evaluated for impairment	3,926,553					3,367,193					3,926,553		3,367,193		3,219,012
Total Loans and Leases	4,061,001					3,509,175	[3]				4,061,001		3,509,175	[3]	3,361,425
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period					43,518					41,951	43,518		41,951		56,995
Provision (benefit) charged to expense											11,847		17,224		7,808
Losses charged off											(17,679)		(20,712)		(29,037)
Recoveries											4,366		5,055		6,185
Balance, end of period	42,052					43,518					42,052		43,518		41,951
Individually evaluated for impairment	3,477					4,237					3,477		4,237		4,595
Collectively evaluated for impairment	38,575					39,281					38,575		39,281		37,356
Individually evaluated for impairment	48,425					50,249					48,425		50,249		52,092
Collectively evaluated for impairment	2,654,135					2,499,152					2,654,135		2,499,152		2,484,596
Total Loans and Leases	2,702,560					2,549,401					2,702,560		2,549,401		2,536,688
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period					52,114					51,001	52,114		51,001		50,562
Provision (benefit) charged to expense											23,356		10,412		14,442
Losses charged off											(11,522)		(13,668)		(19,126)
Recoveries											2,738		4,369		5,123
Balance, end of period	66,686					52,114					66,686		52,114		51,001
Individually evaluated for impairment	5,197					2,710					5,197		2,710		1,878
Collectively evaluated for impairment	61,489					49,404					61,489		49,404		49,123
Individually evaluated for impairment	56,581					36,176					56,581		36,176		52,018
Collectively evaluated for impairment	4,259,418					3,713,094					4,259,418		3,713,094		3,230,833
Total Loans and Leases	4,315,999					3,749,270					4,315,999		3,749,270		3,282,851
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period					32,102					32,408	32,102		32,408		33,210
Provision (benefit) charged to expense											9,718		2,046		12,975
Losses charged off											(7,578)		(3,237)		(15,425)
Recoveries											647		885		1,648
Balance, end of period	34,889					32,102					34,889		32,102		32,408
Individually evaluated for impairment	3,163					6,232					3,163		6,232		3,445
Collectively evaluated for impairment	31,726					25,870					31,726		25,870		28,963
Individually evaluated for impairment	39,295					101,817					39,295		101,817		104,808
Collectively evaluated for impairment	3,952,354					3,452,611					3,952,354		3,452,611		2,953,554
Total Loans and Leases	3,991,649					3,554,428					3,991,649		3,554,428		3,058,362
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period					$ 6,078					$ 4,186	6,078		4,186		4,332
Provision (benefit) charged to expense											(1,678)		253		(2,912)
Losses charged off											(273)		(595)		(279)
Recoveries											1,360		2,234		3,045
Balance, end of period	5,487					6,078					5,487		6,078		4,186
Individually evaluated for impairment	3					28					3		28		0
Collectively evaluated for impairment	5,484					6,050					5,484		6,050		4,186
Individually evaluated for impairment	422					632					422		632		210
Collectively evaluated for impairment	600,104					537,119					600,104		537,119		460,240
Total Loans and Leases	$ 600,526					$ 537,751					$ 600,526		$ 537,751		$ 460,450

[1]	Accrued interest of $43.1 million and $38.4 million at December 31, 2015 and December 31, 2014, respectively, are not included in the loan and lease balances.
[2]	Loan and lease balances include net deferred fees and unamortized premiums of $18.0 million and $10.6 million at December 31, 2015 and December 31, 2014, respectively.
[3]	U.S. Government guaranteed loans of approximately $2.0 million were reclassified from non-accrual to over 90 days past due and accruing reflective of a policy change effective in the first quarter of 2015.

Loans and Leases (Impaired Loan

Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 316,542	$ 366,129
Total Recorded Investment	279,171	330,856	[1]
Recorded Investment No Allowance	95,225	113,011
Recorded Investment With Allowance	183,946	217,845
Related Valuation Allowance	22,204	25,301
Interest Receivable	43,100	38,400
Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Interest Receivable	1,700	1,400
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	148,144	157,152
Total Recorded Investment	134,448	141,982	[1]
Recorded Investment No Allowance	23,024	24,335
Recorded Investment With Allowance	111,424	117,647
Related Valuation Allowance	10,364	12,094
Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	56,680	60,424
Total Recorded Investment	48,425	50,249	[1]
Recorded Investment No Allowance	25,130	26,432
Recorded Investment With Allowance	23,295	23,817
Related Valuation Allowance	3,477	4,237
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,010	7,218
Total Recorded Investment	5,962	6,161	[1]
Recorded Investment No Allowance	5,939	5,940
Recorded Investment With Allowance	23	221
Related Valuation Allowance	3	10
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	612	629
Total Recorded Investment	422	632	[1]
Recorded Investment No Allowance	328	0
Recorded Investment With Allowance	94	632
Related Valuation Allowance	3	28
Commercial and Industrial Sector [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	67,116	41,019
Total Recorded Investment	56,581	36,176	[1]
Recorded Investment No Allowance	31,600	15,998
Recorded Investment With Allowance	24,981	20,178
Related Valuation Allowance	5,197	2,710
Commercial Real Estate [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	36,980	99,687
Total Recorded Investment	33,333	95,656	[1]
Recorded Investment No Allowance	9,204	40,306
Recorded Investment With Allowance	24,129	55,350
Related Valuation Allowance	$ 3,160	$ 6,222

[1]	Total recorded investment of impaired loans and leases exclude $1.7 million and $1.4 million of accrued interest receivable at December 31, 2015 and December 31, 2014, respectively.

Loans and Leases (Interest Inco

Loans and Leases (Interest Income From Impaired Loans And Leases, By Class) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 305,015	$ 339,477	$ 380,415
Accrued Interest Income	8,557	12,180	13,129
Cash Basis Interest Income	2,238	2,424	3,678
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	138,215	142,198	144,325
Accrued Interest Income	4,473	4,644	4,119
Cash Basis Interest Income	1,139	1,221	1,954
Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	49,337	51,171	53,318
Accrued Interest Income	1,451	1,484	1,003
Cash Basis Interest Income	1,099	1,203	1,724
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6,062	8,381	15,254
Accrued Interest Income	133	269	620
Cash Basis Interest Income	0	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	527	421	1,284
Accrued Interest Income	16	28	22
Cash Basis Interest Income	0	0	0
Commercial and Industrial Sector [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	46,379	44,097	60,558
Accrued Interest Income	1,319	2,326	2,889
Cash Basis Interest Income	0	0	0
Commercial Real Estate [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	64,495	93,209	105,676
Accrued Interest Income	1,165	3,429	4,476
Cash Basis Interest Income	$ 0	$ 0	$ 0

Loans and Leases (Commercial, C

Loans and Leases (Commercial, Commercial Real Estate Loans And Equipment Financing Loans Segregated By Risk Rating Exposure) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	$ 4,315,999	$ 3,749,270
Commercial Portfolio Segment [Member] \| (1) - (6) Pass [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	4,023,255	3,545,218
Commercial Portfolio Segment [Member] \| (7) Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	70,904	88,777
Commercial Portfolio Segment [Member] \| (8) Substandard [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	220,389	115,106
Commercial Portfolio Segment [Member] \| (9) Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	1,451	169
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	3,991,649	3,554,428
Commercial Real Estate Portfolio Segment [Member] \| (1) - (6) Pass [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	3,857,019	3,408,128
Commercial Real Estate Portfolio Segment [Member] \| (7) Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	55,030	33,453
Commercial Real Estate Portfolio Segment [Member] \| (8) Substandard [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	79,289	112,354
Commercial Real Estate Portfolio Segment [Member] \| (9) Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	311	493
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	600,526	537,751
Finance Leases Portfolio Segment [Member] \| (1) - (6) Pass [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	586,445	516,116
Finance Leases Portfolio Segment [Member] \| (7) Special Mention [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	1,628	4,364
Finance Leases Portfolio Segment [Member] \| (8) Substandard [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	12,453	17,271
Finance Leases Portfolio Segment [Member] \| (9) Doubtful [Member]
Financing Receivable, Impaired [Line Items]
Total Loans and Leases	$ 0	$ 0

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs	[1]	$ 272,690	$ 318,794
Accruing TDRs performing under modified terms more than one year		55.00%	67.50%
Specific reserves for TDRs included in the balance of allowance for loan and lease losses		$ 21,405	$ 23,785
Additional funds committed to borrowers in TDR status		1,133	552
Interest Receivable		43,100	38,400
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		171,784	241,855
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		100,906	76,939
Troubled Debt Restructures [Member]
Financing Receivable, Modifications [Line Items]
Interest Receivable		$ 1,100	$ 1,400

[1]	Total recorded investment of TDRs exclude $1.1 million and $1.4 million at December 31, 2015 and December 31, 2014, respectively, of accrued interest receivable.

Loans and Leases (Information o

Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015USD ($)loan	Dec. 31, 2014USD ($)loan	Dec. 31, 2013USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		212	262	305
Post-Modification Recorded Investment \| $	[1]	$ 49,215	$ 47,031	$ 61,828
Residential Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		27	27	27
Post-Modification Recorded Investment \| $	[1]	$ 4,909	$ 3,547	$ 5,219
Residential Portfolio Segment [Member] \| Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		3	3	8
Post-Modification Recorded Investment \| $	[1]	$ 573	$ 448	$ 2,759
Residential Portfolio Segment [Member] \| Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		26	22	45
Post-Modification Recorded Investment \| $	[1]	$ 5,315	$ 4,220	$ 8,264
Residential Portfolio Segment [Member] \| other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	[2]	30	55	44
Post-Modification Recorded Investment \| $	[1],[2]	$ 4,366	$ 11,791	$ 9,497
Consumer Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		12	19	24
Post-Modification Recorded Investment \| $	[1]	$ 1,012	$ 944	$ 1,159
Consumer Portfolio Segment [Member] \| Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		0	1	4
Post-Modification Recorded Investment \| $	[1]	$ 0	$ 51	$ 154
Consumer Portfolio Segment [Member] \| Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		12	6	14
Post-Modification Recorded Investment \| $	[1]	$ 945	$ 411	$ 1,504
Consumer Portfolio Segment [Member] \| other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	[2]	68	90	100
Post-Modification Recorded Investment \| $	[1],[2]	$ 3,646	$ 4,931	$ 4,247
Commercial Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		3	7	3
Post-Modification Recorded Investment \| $	[1]	$ 254	$ 422	$ 7,525
Commercial Portfolio Segment [Member] \| Adjusted Interest Rates [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		1	1	0
Post-Modification Recorded Investment \| $	[1]	$ 24	$ 25	$ 0
Commercial Portfolio Segment [Member] \| Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		7	22	22
Post-Modification Recorded Investment \| $	[1]	$ 5,361	$ 1,212	$ 1,083
Commercial Portfolio Segment [Member] \| other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	[2]	20	6	4
Post-Modification Recorded Investment \| $	[1],[2]	$ 22,048	$ 7,431	$ 4,603
Commercial Real Estate Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		1	0	3
Post-Modification Recorded Investment \| $	[1]	$ 315	$ 0	$ 226
Commercial Real Estate Portfolio Segment [Member] \| Combination Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		1	2	6
Post-Modification Recorded Investment \| $	[1]	$ 42	$ 11,106	$ 15,520
Commercial Real Estate Portfolio Segment [Member] \| other concessions [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	[2]	1	0	1
Post-Modification Recorded Investment \| $	[1],[2]	$ 405	$ 0	$ 68
Finance Leases Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan		0	1	0
Post-Modification Recorded Investment \| $	[1]	$ 0	$ 492	$ 0

[1]	Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs as a result of the restructurings was not significant.
[2]	Other includes covenant modifications, forbearance, loans discharged under Chapter 7 bankruptcy, and/or other concessions.

Loans and Leases (Information73

Loans and Leases (Information on Loans and Leases Modified as TDR within the Previous 12 Months (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)loan	Dec. 31, 2014USD ($)loan	Dec. 31, 2013USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	2	9	14
Recorded Investment \| $	$ 58	$ 1,518	$ 1,587
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	1	7	9
Recorded Investment \| $	$ 55	$ 1,494	$ 1,201
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	1	2	4
Recorded Investment \| $	$ 3	$ 24	$ 339
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	0	0	1
Recorded Investment \| $	$ 0	$ 0	$ 47
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases \| loan	0	0	0
Recorded Investment \| $	$ 0	$ 0	$ 0

Loans and Leases (Investments i

Loans and Leases (Investments in TDRs, Segregated by Risk Rating Exposure) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs	[1]	$ 272,690	$ 318,794
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		89,818	126,563
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] \| (1) - (6) Pass [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		12,970	40,734
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] \| (7) Special Mention [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		2,999	8,275
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] \| (8) Substandard [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		72,132	77,211
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] \| (9) Doubtful [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		$ 1,717	$ 343

[1]	Total recorded investment of TDRs exclude $1.1 million and $1.4 million at December 31, 2015 and December 31, 2014, respectively, of accrued interest receivable.

Transfers of Financial Assets75

Transfers of Financial Assets and Mortgage Servicing Assets (Reserve for loan repurchases) (Details) - Loan Purchase Commitments [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 1,059	$ 2,254	$ 2,617
Provision (benefit)	133	(493)	1,209
Loss on repurchased loans and settlements	0	(702)	(1,572)
Ending balance	$ 1,192	$ 1,059	$ 2,254

Transfers of Financial Assets76

Transfers of Financial Assets and Mortgage Servicing Assets (Loans sold) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Net gain on sale	$ 7,795		$ 4,070	$ 16,359
Commercial Portfolio Segment [Member]
Servicing Assets at Fair Value [Line Items]
Proceeds from the sale of loans held for sale	729	[1]	0	12,771
Net gain on sale	145	[1]	0	(229)
Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Proceeds from the sale of loans held for sale	452,590	[1]	287,132	773,887
Net gain on sale	7,795	[1]	4,070	16,359
Loans sold with servicing rights retained	416,277	[1]	$ 264,292	$ 690,300
Consumer Loan [Member]
Servicing Assets at Fair Value [Line Items]
Proceeds from the sale of loans held for sale	$ 32,900

[1]	Additionally, certain consumer loans not originated for sale were sold at cost for cash proceeds of $32.9 million.

Transfers of Financial Assets77

Transfers of Financial Assets and Mortgage Servicing Assets (Narrative) (Details) - Residential Mortgage [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights	$ 2,500	$ 2,400
Servicing Asset at Amortized Cost	20.7	19.4
Bank servicing fees	$ 1.5	$ 1.5	$ 3

Transfers of Financial Assets78

Transfers of Financial Assets and Mortgage Servicing Assets (Schedule of Servicing Assets at Fair Value) (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 28,690	$ 29,150
Originations of servicing assets	8,027	4,581
Due to payoffs/paydowns	(2,741)	(2,577)
Due to market changes	(408)	(2,464)
Ending balance	$ 33,568	$ 28,690

Premises and Equipment (Summary

Premises and Equipment (Summary of Premises and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Land	$ 12,899	$ 12,987
Buildings and improvements	94,686	95,843
Leasehold improvements	79,917	78,029
Fixtures and equipment	73,686	73,180
Data processing and software	195,308	175,887
Total premises and equipment	456,496	435,926
Less: Accumulated depreciation and amortization	(327,070)	(313,993)
Premises and equipment, net	129,426	121,933
Depreciation and amortization	$ 28,400	$ 27,900	$ 31,100

Premises and Equipment (Disclos

Premises and Equipment (Disclosure of Long Lived Assets Held-for-sale) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Movement in Property, Plant and Equipment [Roll Forward]
Beginning balance	$ 759	$ 1,567
Additions	144	1,061
Write-downs	0	(432)
Sales	(266)	(1,437)
Ending balance	$ 637	$ 759

Goodwill and Other Intangible81

Goodwill and Other Intangible Assets (Goodwill And Other Intangible Assets, Net Of Accumulated Amortization) (Detail) - USD ($) $ in Thousands	Jan. 13, 2015	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 529,887
Goodwill acquired	$ 8,486	8,486
Goodwill, ending balance		538,373
Community Banking [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		516,560
Goodwill acquired		0
Goodwill, ending balance		516,560
HSA Bank [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		13,327
Goodwill acquired		8,486
Goodwill, ending balance		$ 21,813

Goodwill and Other Intangible82

Goodwill and Other Intangible Assets (Gross Carrying Value And Accumulated Amortization Of Other Intangible Assets) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 92,420	$ 49,420
Accumulated Amortization	(53,094)	(46,754)
Net Carrying Amount	39,326	2,666
HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43,000	0
Accumulated Amortization	(4,817)	0
Net Carrying Amount	38,183	0
Core Deposits [Member] \| Community Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,420	49,420
Accumulated Amortization	(48,277)	(46,754)
Net Carrying Amount	1,143	2,666
Core Deposits [Member] \| HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,000	0
Accumulated Amortization	(3,269)	0
Net Carrying Amount	$ 18,731	0
Finite-Lived Intangible Asset, Useful Life (in years)	9 years
Customer Relationships [Member] \| HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,000	0
Accumulated Amortization	(1,548)	0
Net Carrying Amount	$ 19,452	$ 0
Customer-Related Intangible Assets [Member] \| HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life (in years)	13 years

Goodwill and Other Intangible83

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 5,652
2,017	4,062
2,018	3,847
2,019	3,847
2,020	3,847
Thereafter	$ 18,071

Income Taxes (Income Tax Expens

Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal									$ 98,442	$ 90,542	$ 62,042
State and local									11,047	6,585	3,572
Total current									109,489	97,127	65,614
Deferred:
Federal									(7,279)	(3,784)	10,760
State and local									(8,234)	(1,370)	739
Total deferred									(15,513)	(5,154)	11,499
Total:
Total federal									91,163	86,758	72,802
Total state and local									2,813	5,215	4,311
Income tax expense	$ 24,146	$ 25,075	$ 20,663	$ 24,092	$ 23,753	$ 23,824	$ 23,159	$ 21,237	$ 93,976	$ 91,973	$ 77,113

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		$ 3,000
Tax Credit Carryforward, Amount		$ 2,100	$ 300	$ 600
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%	35.00%	35.00%
Income Taxes Receivable		$ 56,600	$ 56,700
Interest recognized on income tax refunds		2,800	1,000
Increase (Decrease) in Deferred Income Taxes		27,700
Deferred tax (benefit) expense		(15,513)	(5,154)	$ 11,499
Valuation allowance increase (decrease)		(5,800)
Deferred Tax Assets, Valuation Allowance		74,918	80,722
Net operating loss and credit carry forwards		62,403	64,561
Unrecognized deferred tax liability for thrift bad-debt reserves		21,400
Bad Debt Reserve for Tax Purposes of Qualified Lender		58,000	58,000
Unrecognized tax benefits that would impact effective tax rate		3,300	3,000	2,000
Interest and penalties		1,100	500	$ 300
Accrued interest and penalties related to UTBs		2,500	$ 1,600
Shareholders' Equity [Member]
Operating Loss Carryforwards [Line Items]
Increase (Decrease) in Deferred Income Taxes		14,300
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		1,000
Deferred Tax Assets, Valuation Allowance		69,600
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		(1,000)
Deferred Tax Assets, Valuation Allowance		5,300
Future years [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance increase (decrease)		4,400
Connecticut [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance		58,000
Net operating loss and credit carry forwards		1,200,000
Tax credit carryforwards		2,200
Minimum [Member] \| Forecast [Member]
Operating Loss Carryforwards [Line Items]
Decrease in UTBs	$ 2,200
Maximum [Member] \| Forecast [Member]
Operating Loss Carryforwards [Line Items]
Decrease in UTBs	$ 3,400
Available-for-sale Securities [Member]
Operating Loss Carryforwards [Line Items]
Increase (Decrease) in Deferred Income Taxes		13,300
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		$ 15,400

Income Taxes (Schedule of Effec

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at federal statutory rate									$ 105,111	$ 102,095	$ 89,799
State and local income taxes, net of federal benefit									7,613	3,390	2,802
Tax-exempt interest income, net									(7,117)	(7,335)	(8,517)
Decrease in valuation allowance applicable to net state deferred tax assets, net of federal effects									(5,785)	0	0
Increase in cash surrender value of life insurance									(4,557)	(4,612)	(4,819)
Other, net									(1,289)	(1,565)	(2,152)
Income tax expense	$ 24,146	$ 25,075	$ 20,663	$ 24,092	$ 23,753	$ 23,824	$ 23,159	$ 21,237	$ 93,976	$ 91,973	$ 77,113
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									35.00%	35.00%	35.00%
State and local taxes, net of federal benefit, Percent									2.50%	1.20%	1.10%
Tax-exempt interest income, net, Percent									(2.40%)	(2.50%)	(3.30%)
Decrease in valuation allowance applicable to net state deferred tax assets, net of federal effects, Percent									(1.90%)	0.00%	0.00%
Increase in cash surrender value of life insurance, Percent									(1.50%)	(1.60%)	(1.90%)
Other, net, Percent									(0.40%)	(0.60%)	(0.80%)
Effective Tax Rate, Percent									31.30%	31.50%	30.10%

Income Taxes (Schedule of Defer

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for loan and lease losses	$ 70,937	$ 65,288
Net operating loss and credit carry forwards	62,403	64,561
Compensation and employee benefit plans	52,422	47,748
Net losses on derivative instruments	11,734	12,637
Net unrealized loss on securities available for sale	4,138	0
Other	27,862	27,300
Gross deferred tax assets	229,496	217,534
Valuation allowance	(74,918)	(80,722)
Total deferred tax assets, net of valuation allowance	154,578	136,812
Deferred tax liabilities:
Net unrealized gain on securities available for sale	0	10,288
Equipment-financing leases	23,934	21,930
Deferred income on repurchase of debt	6,376	8,502
Intangible assets	9,165	9,242
Mortgage servicing assets	7,127	7,230
Other	6,398	5,747
Gross deferred tax liabilities	53,000	62,939
Deferred tax asset, net	$ 101,578	$ 73,873

Income Taxes (Summary of Positi

Income Taxes (Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 4,593	$ 3,109	$ 3,119
Additions as a result of tax positions taken during the current year	865	956	528
Additions as a result of tax positions taken during prior years	1,254	1,031	442
Reductions as a result of tax positions taken during prior years	(247)	0	(460)
Reductions relating to settlements with taxing authorities	(992)	0	0
Reductions as a result of lapse of statute of limitations	(379)	(503)	(520)
Ending balance	$ 5,094	$ 4,593	$ 3,109

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Demand	$ 3,713,063	$ 3,598,872
Checking	2,369,971	2,155,047
Health savings accounts	3,802,313	1,824,799
Money market	1,933,460	1,908,522
Savings	4,047,817	3,892,778
Time deposits	2,086,154	2,271,587
Total interest-bearing	14,239,715	12,052,733
Total deposits	17,952,778	15,651,605
Time deposits and interest-bearing checking, included in above balances, obtained through brokers	910,304	651,725
Time deposits, included in above balance, that meet or exceed the Federal Deposit Insurance Corporation limit	542,206	533,980
Demand deposit overdrafts reclassified as loan balances	$ 1,356	$ 1,655

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
2,016	$ 1,034,275
2,017	253,782
2,018	240,921
2,019	392,926
2,020	164,154
Thereafter	96
Total time deposits	$ 2,086,154	$ 2,271,587

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	$ 834,400	$ 959,756
Fed funds purchased	317,000	291,000
Securities sold under agreements to repurchase and other borrowings	1,151,400	1,250,756
Original maturity of one year or less [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	334,400	409,756
Original maturity of greater than one year, non-callable [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	$ 500,000	$ 550,000

Borrowings (Summary Of Advances

Borrowings (Summary Of Advances Payable To The Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Total Outstanding	$ 2,025,934	$ 2,275,000
FHLB advances maturing after 1 but within 2 years, Total Outstanding	500	145,934
FHLB advances maturing after 2 but within 3 years, Total Outstanding	200,000	500
FHLB advances maturing after 3 but within 4 years, Total Outstanding	103,026	200,000
FHLB advances maturing after 4 but within 5 years, Total Outstanding	175,000	78,026
FHLB advances maturing after 5 years, Total Outstanding	159,655	159,934
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	2,664,115	2,859,394
Debt Instrument, Unamortized Premium	24	37
Federal Home Loan Bank advances	$ 2,664,139	$ 2,859,431
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]
FHLB advances maturing within 1 year, Weighted-Average Contractual Coupon Rate (as a percent)	0.55%	0.23%
FHLB advances maturing after 1 but within 2 years, Weighted-Average Contractual Coupon Rate (as a percent)	5.66%	1.80%
FHLB advances maturing after 2 but within 3 years, Weighted-Average Contractual Coupon Rate (as a percent)	1.36%	5.66%
FHLB advances maturing after 3 but within 4 years, Weighted-Average Contractual Coupon Rate (as a percent)	1.54%	1.36%
FHLB advances maturing after 4 but within 5 years, Weighted-Average Contractual Coupon Rate (as a percent)	1.77%	1.95%
FHLB advances maturing after 5 years, Weighted-Average Contractual Coupon Rate (as a percent)	1.60%	1.27%
Federal Home Loan Bank, Advances, Weighted Average Interest Rate (as a percent)	0.79%	0.50%

Borrowings (Narrative) (Detail)

Borrowings (Narrative) (Detail) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances [Line Items]
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	$ 5,700	$ 5,200
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	1,200	700
Line of Credit [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	$ 5	$ 5

Borrowings (Long-Term Debt) (De

Borrowings (Long-Term Debt) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Notes and subordinated debt		$ 227,320	$ 227,320
Long-term debt		$ 226,356	$ 226,237
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		3.48%	3.19%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate spread of LIBOR plus (as a percent)		2.95%
Long-term Debt [Member]
Debt Instrument [Line Items]
Unamortized discount on senior fixed-rate notes		$ (964)	$ (1,083)
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.375%
Notes and subordinated debt		$ 150,000	150,000
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	[1]	$ 77,320	$ 77,320

[1]	The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 3.48% at December 31, 2015 and 3.19% at December 31, 2014.

Shareholders' Equity (Class of

Shareholders' Equity (Class of Stock Disclosure) (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Outstanding, beginning balance	90,381,535
Restricted share activity	377,598	0
Stock options exercised	58,473
Common stock repurchased	350,000
Warrant exercise	28,511
Series A conversion	1,065,075
Common Stock Outstanding, ending balance	91,561,192	90,381,535
Series A Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Issued, beginning balance	28,939
Series A conversion	28,939
Shares, Issued, ending balance	0	28,939
Series E Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Issued, beginning balance	5,060
Shares, Issued, ending balance	5,060	5,060
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Issued, beginning balance	93,623,090
Warrant exercise	28,511
Shares, Issued, ending balance	93,651,601	93,623,090
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock Held, beginning balance	3,241,555
Restricted share activity	377,598
Stock options exercised	58,473
Common stock repurchased	350,000
Series A conversion	1,065,075
Treasury Stock Held, ending balance	2,090,409	3,241,555

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($)	Jun. 01, 2015	Dec. 04, 2012	Jun. 08, 2011	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 06, 2012
Class of Stock [Line Items]
Common stock par value (in usd per share)			$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock warrants repurchased					$ 23,000	$ 3,000	$ 30,000
Preferred stock, par value (in usd per share)				$ 0.01	$ 0.01	$ 0.01
Share Price	$ 27.17
Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount								$ 100,000,000
Treasury stock acquired, average cost per share (in usd per share)					$ 35.90
Stock repurchase program, remaining authorized repurchase amount				$ 26,700,000	$ 26,700,000
Series A [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)	8.50%
Preferred stock, par value (in usd per share)	$ 0.01
Preferred stock, liquidation preference per share (in usd per share)	$ 1,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Conversion of Stock, Shares Issued	36.8046
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)		6.40%
Preferred stock, par value (in usd per share)		$ 0.01
Preferred stock, liquidation preference per share (in usd per share)		$ 25,000
Depository shares, issued		5,060,000
Depository share, par or stated value per share (in usd per share)		$ 25
Warrant [Member]
Class of Stock [Line Items]
Number of securities called by warrants or rights (in shares)			3,282,276
Exercise price of warrants or rights (in usd per share)			$ 18.28
Common stock warrants repurchased			$ 14,400,000
Number of warrants repurchased at auction (in shares)			2,282,276
Number of warrants repurchased (in shares)					1,210
Warrants exercised (in shares)				58,365
Class of Warrant or Right, Outstanding (in shares)				63,344	63,344

Accumulated Other Comprehensi97

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (56,261)	$ (48,549)	$ (32,266)
Other comprehensive (loss) income before reclassifications	(29,043)	(10,191)	(28,530)
Amounts reclassified from accumulated other comprehensive income (loss)	7,198	2,479	12,247
Other comprehensive loss, net of tax	(21,845)	(7,712)	(16,283)
Ending Balance	(78,106)	(56,261)	(48,549)
Available For Sale and Transferred Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	16,421	(2,617)	42,741
Other comprehensive (loss) income before reclassifications	(22,512)	21,811	(49,572)
Amounts reclassified from accumulated other comprehensive income (loss)	(316)	(2,773)	4,214
Other comprehensive loss, net of tax	(22,828)	19,038	(45,358)
Ending Balance	(6,407)	16,421	(2,617)
Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(25,530)	(18,206)	(27,902)
Other comprehensive (loss) income before reclassifications	(3,136)	(12,506)	3,744
Amounts reclassified from accumulated other comprehensive income (loss)	5,686	5,182	5,952
Other comprehensive loss, net of tax	2,550	(7,324)	9,696
Ending Balance	(22,980)	(25,530)	(18,206)
Defined Benefit Pension and Postretirement Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(47,152)	(27,726)	(47,105)
Other comprehensive (loss) income before reclassifications	(3,395)	(19,496)	17,298
Amounts reclassified from accumulated other comprehensive income (loss)	1,828	70	2,081
Other comprehensive loss, net of tax	(1,567)	(19,426)	19,379
Ending Balance	$ (48,719)	$ (47,152)	$ (27,726)

Accumulated Other Comprehensi98

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Reclassifications from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Impairment loss on securities recognized in earnings	$ (28)	$ (82)	$ 0	$ 0	$ (899)	$ (85)	$ (73)	$ (88)	$ (110)	$ (1,145)	$ (7,277)
Net of tax	52,579	51,536	52,503	49,722	51,006	50,457	47,834	50,429	206,340	199,726	179,456
Total interest expense	$ (24,820)	$ (23,988)	$ (23,459)	$ (23,148)	$ (23,103)	$ (22,544)	$ (22,375)	$ (22,478)	(95,415)	(90,500)	(90,912)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(7,198)	(2,479)	(12,247)
Available For Sale and Transferred Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									316	2,773	(4,214)
Available For Sale and Transferred Securities [Member] \| Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investment securities, net									609	5,499	712
Income tax expense									(183)	(1,581)	2,351
Net of tax									316	2,773	(4,214)
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] \| Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Impairment loss on securities recognized in earnings									(110)	(1,145)	(7,277)
Derivative Instruments [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(5,686)	(5,182)	(5,952)
Derivative Instruments [Member] \| Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense									3,279	2,918	3,320
Net of tax									(5,686)	(5,182)	(5,952)
Total interest expense									(8,965)	(8,100)	(9,272)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits									(2,809)	(37)	(3,169)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits									(73)	(73)	(73)
Defined benefit pension and postretirement benefit plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense									1,054	40	1,161
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									$ (1,828)	$ (70)	$ (2,081)

Accumulated Other Comprehensi99

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale and transferred securities:
Net unrealized loss during the period	$ (35,701)	$ 34,242	$ (77,524)
Reclassification for net gain included in net income	(609)	(5,499)	(712)
Net non-credit other than temporary impairment	110	1,145	7,277
Amortization of unrealized loss on securities transferred to held-to-maturity	37	60	296
Total available-for-sale and transferred securities	(36,163)	29,948	(70,663)
Derivative instruments:
Net unrealized loss during the period	(4,945)	(19,589)	5,826
Reclassification adjustment for net loss included in net income	8,965	8,100	9,272
Total derivative instruments	4,020	(11,489)	15,098
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	(5,367)	(30,683)	26,949
Reclassification adjustment for amortization of net loss included in net income	2,809	37	3,169
Reclassification adjustment for prior service cost included in net income	73	73	73
Total defined benefit pension and postretirement benefit plans	(2,485)	(30,573)	30,191
Available-for-sale and transferred securities:
Net unrealized loss during the period	13,166	(12,469)	27,762
Reclassification for net gain included in net income	223	1,999	255
Net non-credit other than temporary impairment	(40)	(418)	(2,606)
Amortization of unrealized loss on securities transferred to held-to-maturity	(14)	(22)	(106)
Total available-for-sale and transferred securities	13,335	(10,910)	25,305
Derivative instruments:
Net unrealized loss during the period	1,809	7,083	(2,082)
Reclassification adjustment for net loss included in net income	(3,279)	(2,918)	(3,320)
Total derivative instruments	(1,470)	4,165	(5,402)
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	1,972	11,187	(9,651)
Reclassification adjustment for amortization of net loss included in net income	(1,027)	(14)	(1,135)
Reclassification adjustment for prior service cost included in net income	(27)	(26)	(26)
Total defined benefit pension and postretirement benefit plans	918	11,147	(10,812)
Available-for-sale and transferred securities:
Net unrealized loss during the period	(22,535)	21,773	(49,762)
Reclassification for net gain included in net income	(386)	(3,500)	(457)
Net non-credit other than temporary impairment	70	727	4,671
Amortization of unrealized loss on securities transferred to held-to-maturity	23	38	190
Total available-for-sale and transferred securities	(22,828)	19,038	(45,358)
Derivative instruments:
Net unrealized gains (losses) on derivative instruments	(3,136)	(12,506)	3,744
Reclassification adjustment for net loss included in net income	5,686	5,182	5,952
Total derivative instruments	2,550	(7,324)	9,696
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	(3,395)	(19,496)	17,298
Reclassification adjustment for amortization of net loss included in net income	1,782	23	2,034
Reclassification adjustment for prior service cost included in net income	46	47	47
Total defined benefit pension and postretirement benefit plans	(1,567)	(19,426)	19,379
Other Comprehensive Income (Loss), Pre-Tax Amount	(34,628)	(12,114)	(25,374)
Other Comprehensive Income (Loss), Tax Benefit (Expense)	12,783	4,402	9,091
Other comprehensive loss, net of tax	$ (21,845)	$ (7,712)	$ (16,283)

Regulatory Matters (Information

Regulatory Matters (Information On The Capital Ratios) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	[1]	$ 1,825,717
Common equity tier 1, Actual Ratio	[1]	10.70%
Common equity tier 1, Capital Requirements, Minimum Amount	[1]	$ 766,928
Common equity tier 1, Capital Requirements, Minimum Ratio	[1]	4.50%
Common equity tier 1, Capital Requirements, Well Capitalized Amount	[1]	$ 1,107,785
Common equity tier 1, Capital Requirements, Well Capitalized Ratio	[1]	6.50%
Total risk-based capital, Actual Amount	[1]	$ 2,201,928	$ 2,096,772
Total risk-based capital, Actual Ratio	[1]	12.90%	14.10%
Total risk-based capital, Capital Requirements, Minimum Amount	[1]	$ 1,363,427	$ 1,192,651
Total risk-based capital, Capital Requirements, Minimum Ratio	[1]	8.00%	8.00%
Total risk-based capital, Capital Requirements, Well Capitalized Amount	[1]	$ 1,704,284	$ 1,490,814
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	[1]	10.00%	10.00%
Tier 1 risk-based capital, Actual Amount	[1]	$ 1,966,829	$ 1,931,276
Tier 1 risk-based capital, Actual Ratio	[1]	11.50%	13.00%
Tier 1 risk-based capital, Capital Requirements, Minimum Amount	[1]	$ 1,022,570	$ 596,326
Tier 1 risk-based capital, Capital Requirements, Minimum Ratio	[1]	6.00%	4.00%
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Amount	[1]	$ 1,363,427	$ 894,488
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Ratio	[1]	8.00%	6.00%
Tier 1 leverage capital, Actual Amount	[1]	$ 1,966,829	$ 1,931,276
Tier 1 leverage capital, Actual Ratio	[1]	8.20%	9.00%
Tier 1 leverage capital, Capital Requirements, Minimum Amount	[1]	$ 954,403	$ 859,241
Tier 1 leverage capital, Capital Requirements, Minimum Ratio	[1]	4.00%	4.00%
Tier 1 leverage capital, Capital Requirements, Well Capitalized Amount	[1]	$ 1,193,004	$ 1,074,051
Tier 1 leverage capital, Capital Requirements, Well Capitalized Ratio	[1]	5.00%	5.00%
Cash Dividends Paid to Parent Company		$ 110,000	$ 100,000
Cash Pass-through Reserve, Federal Home Loan Bank		109,400	38,300
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	[1]	$ 1,870,852
Common equity tier 1, Actual Ratio	[1]	11.00%
Common equity tier 1, Capital Requirements, Minimum Amount	[1]	$ 765,232
Common equity tier 1, Capital Requirements, Minimum Ratio	[1]	4.50%
Common equity tier 1, Capital Requirements, Well Capitalized Amount	[1]	$ 1,105,335
Common equity tier 1, Capital Requirements, Well Capitalized Ratio	[1]	6.50%
Total risk-based capital, Actual Amount	[1]	$ 2,047,961	$ 1,939,229
Total risk-based capital, Actual Ratio	[1]	12.00%	13.00%
Total risk-based capital, Capital Requirements, Minimum Amount	[1]	$ 1,360,412	$ 1,190,242
Total risk-based capital, Capital Requirements, Minimum Ratio	[1]	8.00%	8.00%
Total risk-based capital, Capital Requirements, Well Capitalized Amount	[1]	$ 1,700,515	$ 1,487,803
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	[1]	10.00%	10.00%
Tier 1 risk-based capital, Actual Amount	[1]	$ 1,870,852	$ 1,774,814
Tier 1 risk-based capital, Actual Ratio	[1]	11.00%	11.90%
Tier 1 risk-based capital, Capital Requirements, Minimum Amount	[1]	$ 1,020,309	$ 595,121
Tier 1 risk-based capital, Capital Requirements, Minimum Ratio	[1]	6.00%	4.00%
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Amount	[1]	$ 1,360,412	$ 892,682
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Ratio	[1]	8.00%	6.00%
Tier 1 leverage capital, Actual Amount	[1]	$ 1,870,852	$ 1,774,814
Tier 1 leverage capital, Actual Ratio	[1]	7.90%	8.30%
Tier 1 leverage capital, Capital Requirements, Minimum Amount	[1]	$ 953,371	$ 858,197
Tier 1 leverage capital, Capital Requirements, Minimum Ratio	[1]	4.00%	4.00%
Tier 1 leverage capital, Capital Requirements, Well Capitalized Amount	[1]	$ 1,191,714	$ 1,072,746
Tier 1 leverage capital, Capital Requirements, Well Capitalized Ratio	[1]	5.00%	5.00%

[1]	Calculated under the Basel III capital standard at December 31, 2015 and under the Basel I capital standard at December 31, 2014.

Earnings Per Common Share (Earn

Earnings Per Common Share (Earnings Per Share Basic And Diluted) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 52,579	$ 51,536	$ 52,503	$ 49,722	$ 51,006	$ 50,457	$ 47,834	$ 50,429	$ 206,340	$ 199,726	$ 179,456
Less: Preferred stock dividends									(8,711)	(10,556)	(10,803)
Net income available to common shareholders	$ 50,414	$ 49,341	$ 50,277	$ 46,937	$ 48,224	$ 47,647	$ 45,008	$ 47,617	197,629	189,170	168,653
Less: Earnings applicable to participating securities									660	674	617
Earnings applicable to common shareholders									196,969	188,496	168,036
Net income									206,340	199,726	179,456
Net income available to common shareholders									197,629	189,170	168,653
Less: Earnings applicable to participating securities									660	674	617
Earnings applicable to common shareholders									$ 196,969	$ 188,496	$ 168,036
Weighted-average common shares outstanding - basic									90,968	89,899	88,713
Stock options and restricted stock (in shares)									524	466	436
Weighted-average common shares outstanding - diluted									91,533	90,620	90,261
Earnings per common share, Basic (in dollars per share)	$ 0.55	$ 0.54	$ 0.55	$ 0.52	$ 0.54	$ 0.53	$ 0.50	$ 0.53	$ 2.17	$ 2.10	$ 1.90
Earnings per common share, Diluted (in dollars per share)	$ 0.55	$ 0.54	$ 0.55	$ 0.52	$ 0.53	$ 0.53	$ 0.50	$ 0.53	$ 2.15	$ 2.08	$ 1.86
Warrant - US Treasury [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Warrants (in shares)									41	255	190
Warrants - Warburg [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Warrants (in shares)									0	0	922

Earnings Per Common Share (Sche

Earnings Per Common Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	213	587	850
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	92	171	201

Derivative Financial Instrum103

Derivative Financial Instruments (Risk Management Objective of Using Derivatives) (Narrative) (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Interest expense (reduction) related to previous fair value hedges		$ 4,265,000	$ 4,280,000	$ 3,124,000
Designated as Hedging Instrument [Member] \| Interest Expense [Member] \| Fair Value Hedging [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Interest expense (reduction) related to previous fair value hedges	$ 0		$ (1,100,000)	$ (3,400,000)

Derivative Financial Instrum104

Derivative Financial Instruments (Schedule of Notional Amounts of Outstanding Derivative Positions) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount	$ 5,514,013	$ 10,327,833
Interest Rate Contract [Member]
Derivative [Line Items]
Notional Amount	5,366,372	10,237,325
Other Contract [Member]
Derivative [Line Items]
Notional Amount	12,858	60
Credit Default Swap, Selling Protection [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Notional Amount	92,985	55,626
Credit Default Swap, Buying Protection [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Notional Amount	$ 41,798	$ 34,822

Derivative Financial Instrum105

Derivative Financial Instruments (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	$ 58,640	$ 48,391
Other Liabilities [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	38,939	32,180
Designated as Hedging Instrument [Member] \| Other Assets [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	2,507	4,481
Designated as Hedging Instrument [Member] \| Other Liabilities [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	1,359	4,598
Not Designated as Hedging Instrument [Member] \| Other Assets [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	58,304	48,209
Not Designated as Hedging Instrument [Member] \| Other Assets [Member] \| Other Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	183	0
Not Designated as Hedging Instrument [Member] \| Other Liabilities [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	38,619	31,915
Not Designated as Hedging Instrument [Member] \| Other Liabilities [Member] \| Other Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	75	7
Not Designated as Hedging Instrument [Member] \| Credit Default Swap, Selling Protection [Member] \| Other Assets [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0	0
Not Designated as Hedging Instrument [Member] \| Credit Default Swap, Selling Protection [Member] \| Other Liabilities [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	245	258
Not Designated as Hedging Instrument [Member] \| Credit Default Swap, Buying Protection [Member] \| Other Assets [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	153	182
Not Designated as Hedging Instrument [Member] \| Credit Default Swap, Buying Protection [Member] \| Other Liabilities [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	$ 0	$ 0

Derivative Financial Instrum106

Derivative Financial Instruments (Schedule of the changes in the fair value of non-hedge accounting derivatives) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Total impact on non-interest income	$ 4,265	$ 4,280	$ 3,124
Operating Expense [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total impact on non-interest income	4,361	4,482	3,244
Operating Expense [Member] \| Not Designated as Hedging Instrument [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total impact on non-interest income	(33)	51	0
Operating Expense [Member] \| Not Designated as Hedging Instrument [Member] \| Other Contract [Member]
Derivative [Line Items]
Total impact on non-interest income	$ (63)	$ (253)	$ (120)

Derivative Financial Instrum107

Derivative Financial Instruments (AOCL Cash Flow Derivatives - Narrative) (Details) - Cash Flow Hedging [Member] $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 7.7
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	(29)
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 1.7

Derivative Financial Instrum108

Derivative Financial Instruments (Schedule of offsetting financial assets and liabilities for non-customer derivative positions) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Notional Amount		$ 5,514,013	$ 10,327,833
Dealer A [Member]
Offsetting Liabilities [Line Items]
Notional Amount		391,745	427,430
(Liability)/ Asset, net		(4,046)	(5,454)
Cash Collateral Posted		3,800	5,300
Net Exposure	[1]	0	0
Dealer B [Member]
Offsetting Liabilities [Line Items]
Notional Amount		274,353	319,663
(Liability)/ Asset, net		(3,004)	(3,948)
Cash Collateral Posted		3,020	3,610
Net Exposure	[1]	16	0
Dealer C [Member]
Offsetting Liabilities [Line Items]
Notional Amount		5,775	11,538
(Liability)/ Asset, net		(433)	(834)
Cash Collateral Posted		0	0
Net Exposure	[1]	0	0
Dealer D [Member]
Offsetting Liabilities [Line Items]
Notional Amount		387,550	303,663
(Liability)/ Asset, net		(1,546)
Cash Collateral Posted		1,300
(Liability)/ Asset, net			267
Cash Collateral Posted (Received)			(400)
Net Exposure	[1]	0	0
Dealer E [Member]
Offsetting Liabilities [Line Items]
Notional Amount		421,545	424,401
(Liability)/ Asset, net		(644)
Cash Collateral Posted		470
(Liability)/ Asset, net			1,409
Cash Collateral Posted (Received)			(1,420)
Net Exposure	[1]	0	0
DCO [Member]
Offsetting Liabilities [Line Items]
Notional Amount		1,352,206	6,631,936
(Liability)/ Asset, net		(27,226)	(20,932)
Cash Collateral Posted		42,975	39,037
Net Exposure	[1]	15,749	18,105
Dealers Total [Member]
Offsetting Liabilities [Line Items]
Notional Amount		2,833,174	8,118,631
(Liability)/ Asset, net		(36,899)	(29,492)
Cash Collateral Posted		51,565	46,127
Designated as Hedging Instrument [Member] \| Dealer A [Member]
Offsetting Liabilities [Line Items]
Gain		248	0
Loss		(1,359)	(739)
Designated as Hedging Instrument [Member] \| Dealer B [Member]
Offsetting Liabilities [Line Items]
Gain		752	1,494
Loss		0	0
Designated as Hedging Instrument [Member] \| Dealer C [Member]
Offsetting Liabilities [Line Items]
Gain		0	0
Loss		0	0
Designated as Hedging Instrument [Member] \| Dealer D [Member]
Offsetting Liabilities [Line Items]
Gain		377	747
Loss		0	0
Designated as Hedging Instrument [Member] \| Dealer E [Member]
Offsetting Liabilities [Line Items]
Gain		1,130	2,240
Loss		0	0
Designated as Hedging Instrument [Member] \| DCO [Member]
Offsetting Liabilities [Line Items]
Gain		0	0
Loss		0	(3,858)
Designated as Hedging Instrument [Member] \| Dealers Total [Member]
Offsetting Liabilities [Line Items]
Gain		2,507	4,481
Loss		(1,359)	(4,597)
Non-Hedge Accounting [Member] \| Dealer A [Member]
Offsetting Liabilities [Line Items]
Gain		504	1,861
Loss		(3,439)	(6,576)
Non-Hedge Accounting [Member] \| Dealer B [Member]
Offsetting Liabilities [Line Items]
Gain		348	978
Loss		(4,104)	(6,420)
Non-Hedge Accounting [Member] \| Dealer C [Member]
Offsetting Liabilities [Line Items]
Gain		0	0
Loss		(433)	(834)
Non-Hedge Accounting [Member] \| Dealer D [Member]
Offsetting Liabilities [Line Items]
Gain		125	1,147
Loss		(2,048)	(1,627)
Non-Hedge Accounting [Member] \| Dealer E [Member]
Offsetting Liabilities [Line Items]
Gain		138	867
Loss		(1,912)	(1,698)
Non-Hedge Accounting [Member] \| DCO [Member]
Offsetting Liabilities [Line Items]
Gain		1,140	555
Loss		(28,366)	(17,629)
Non-Hedge Accounting [Member] \| Dealers Total [Member]
Offsetting Liabilities [Line Items]
Gain		2,255	5,408
Loss		$ (40,302)	$ (34,784)

[1]	Net positive exposure represents over-collateralized loss positions which can result from DCO initial margin requirements posted in compliance with the Dodd-Frank Wall Street Reform and Consumer Protection Act.

Derivative Financial Instrum109

Derivative Financial Instruments (Counterparty Credit Risk) (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Maximum exposure	$ 58,300
Market Approach Valuation Technique [Member]
Derivative [Line Items]
Maximum exposure	19,800
Dealers Total [Member]
Derivative [Line Items]
Cash Collateral Posted	$ 51,565	$ 46,127

Derivative Financial Instrum110

Derivative Financial Instruments (Mortgage Banking Derivatives) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Outstanding rate locks	$ 62,500
Outstanding commitments to sell residential mortgage loans	84,400
Mandatory Forward Commitment	82,000
Mortgage Banking Derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivative [Line Items]
Derivative, Gain on Derivative	$ 819	$ 18

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Thousands	Jan. 13, 2015	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total credit-related financial instruments with off-balance sheet risk		$ 5,031,030	$ 4,547,484
Fair Value Inputs, Long-term Revenue Growth Rate	2.50%
Fair Value Inputs, Annual Account Attrition Rate	13.00%
Fair Value Inputs, Shock Attrition Rate	6.00%
Discount rate	16.50%
Fair Value Inputs, Control Premium	4.50%
Rabbi Trust [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned		3,900
Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total credit-related financial instruments with off-balance sheet risk		6,800
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Book value of other real estate owned (OREO) and repossessed assets		$ 5,000

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring Basis) (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets held at fair value	$ 3,060,771	$ 2,853,139
Derivative instruments	40,298	36,777
Contingent Liability	6,000
Total financial liabilities held at fair value	46,298	36,777
US Treasury Bill Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	924	525
Agency collateralized mortgage obligations (agency CMO) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	548,754	550,988
Agency mortgage-backed securities (agency MBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	1,065,109	1,028,518
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	215,350	80,266
Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	579,266	553,393
Collateralized loan obligations (CLO) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	429,159	425,734
Single issuer trust preferred securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	37,170	38,245
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	106,321	110,301
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	2,578	5,903
Investments held In Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	5,372	5,901
Alternative investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	3,471	475
Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	61,147	52,872
Mortgage banking derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	819	18
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets held at fair value	9,057	12,329
Derivative instruments	66	293
Total financial liabilities held at fair value	66	293
Fair Value, Inputs, Level 1 [Member] \| US Treasury Bill Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	924	525
Fair Value, Inputs, Level 1 [Member] \| Agency commercial mortgage-backed securities (agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	2,578	5,903
Fair Value, Inputs, Level 1 [Member] \| Investments held In Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	5,372	5,901
Fair Value, Inputs, Level 1 [Member] \| Alternative investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	0	0
Fair Value, Inputs, Level 1 [Member] \| Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	183	0
Fair Value, Inputs, Level 1 [Member] \| Mortgage banking derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets held at fair value	3,042,912	2,840,335
Derivative instruments	40,232	36,484
Total financial liabilities held at fair value	40,232	36,484
Fair Value, Inputs, Level 2 [Member] \| Agency collateralized mortgage obligations (agency CMO) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	548,754	550,988
Fair Value, Inputs, Level 2 [Member] \| Agency mortgage-backed securities (agency MBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	1,065,109	1,028,518
Fair Value, Inputs, Level 2 [Member] \| Agency commercial mortgage-backed securities (agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	215,350	80,266
Fair Value, Inputs, Level 2 [Member] \| Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	579,266	553,393
Fair Value, Inputs, Level 2 [Member] \| Collateralized loan obligations (CLO) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	429,159	425,734
Fair Value, Inputs, Level 2 [Member] \| Single issuer trust preferred securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	37,170	38,245
Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	106,321	110,301
Fair Value, Inputs, Level 2 [Member] \| Alternative investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	0	0
Fair Value, Inputs, Level 2 [Member] \| Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	60,964	52,872
Fair Value, Inputs, Level 2 [Member] \| Mortgage banking derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	819	18
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets held at fair value	8,802	475
Contingent Liability	6,000
Total financial liabilities held at fair value	6,000
Significant Unobservable Inputs (Level 3) [Member] \| Agency commercial mortgage-backed securities (agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Non-agency commercial mortgage-backed securities (non-agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Alternative investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	3,471	475
Significant Unobservable Inputs (Level 3) [Member] \| Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Significant Unobservable Inputs (Level 3) [Member] \| Mortgage banking derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	2,984,631	2,793,873
Available-for-sale Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	3,502	6,428
Available-for-sale Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	2,981,129	$ 2,787,445
Contingent Asset [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	5,331
Contingent Asset [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	0
Contingent Asset [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	0
Contingent Asset [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investments	$ 5,331

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	$ 475
Level 3, beginning of period, Contingent Liability	0
Acquisition/Purchases/capital funding	3,219
Acquisition, Contingent Liability	6,000
Unrealized (loss) gain included in net income	161
Distributions	(53)
Level 3, end of period, Financial Assets	8,802
Level 3, end of period, Contingent Liability	6,000
Equity Method Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	475
Acquisition/Purchases/capital funding	3,219
Unrealized (loss) gain included in net income	(170)
Distributions	(53)
Level 3, end of period, Financial Assets	3,471
Contingent Asset [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	0
Acquisition/Purchases/capital funding	5,000
Unrealized (loss) gain included in net income	331
Level 3, end of period, Financial Assets	$ 5,331

Fair Value Measurements (Sch114

Fair Value Measurements (Schedule Of Valuation Methodology And Unobservable Inputs) (Detail) - USD ($) $ in Thousands	Jan. 13, 2015	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates	16.50%
Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned		$ 652
Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		8.00%
Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned [Member] \| Minimum [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		0.00%
Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned [Member] \| Maximum [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		20.00%
Fair Value, Measurements, Nonrecurring [Member] \| Mortgage Servicing Rights [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgage servicing assets		$ 33,568
Fair Value, Measurements, Nonrecurring [Member] \| Mortgage Servicing Rights [Member] \| Minimum [Member] \| Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		1.40%
Fair Value, Measurements, Nonrecurring [Member] \| Mortgage Servicing Rights [Member] \| Maximum [Member] \| Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		3.40%
Interest Rate Risk [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Mortgage Servicing Rights [Member] \| Minimum [Member] \| Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate		7.40%
Interest Rate Risk [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Mortgage Servicing Rights [Member] \| Maximum [Member] \| Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate		32.40%
Nonperforming Financial Instruments [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans and leases		$ 19,644
Nonperforming Financial Instruments [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Minimum [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		4.00%
Nonperforming Financial Instruments [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Minimum [Member] \| Market Approach Valuation Technique - Discount for cost to sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		0.00%
Nonperforming Financial Instruments [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Maximum [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		15.00%
Nonperforming Financial Instruments [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Maximum [Member] \| Market Approach Valuation Technique - Discount for cost to sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rates		8.00%

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	$ 32	$ 23
Debt Instrument, Unamortized Premium	24	37
Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount	20,700	19,400
Reported Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	37,091	67,952
Loans and leases, net	15,496,745	13,740,761
Securities sold under agreements to repurchase and other borrowings	1,151,400	1,250,756
Federal Home Loan Bank advances	2,664,139	2,859,431
Long-term debt	226,356	226,237
Reported Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments	12,900	16,524
Reported Value Measurement [Member] \| Securities held-to-maturity [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities	3,923,052	3,872,955
Reported Value Measurement [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount	20,698	19,379
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	37,457	68,705
Securities sold under agreements to repurchase and other borrowings	1,163,974	1,271,596
Federal Home Loan Bank advances	2,647,872	2,872,515
Long-term debt	218,143	227,751
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net	15,453,892	13,775,850
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments	14,294	18,046
Estimate of Fair Value Measurement [Member] \| Securities held-to-maturity [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities	3,961,534	3,948,706
Estimate of Fair Value Measurement [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Fair Value	33,568	28,690
Deposits other than time deposits [Member] \| Reported Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	15,866,624	13,380,018
Deposits other than time deposits [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	15,866,624	13,380,018
Time Deposits [Member] \| Reported Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	2,086,154	2,271,587
Time Deposits [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits	2,095,357	2,288,760
Long-term Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Unamortized Discount	$ 964	$ 1,083

Retirement Benefit Plans (Narra

Retirement Benefit Plans (Narrative) (Detail) - USD ($) $ in Thousands	Feb. 01, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 01, 2012	Jul. 01, 2015
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 218,000	$ 224,700
Net actuarial loss		7,200
Prior service cost		$ 14
Assumed healthcare cost trend (as a percent)		8.00%
Healthcare-cost trend rate in 2018 (as a percent)		5.00%
Employer matching contribution, percent of match	100.00%				100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent					5.00%
Election period (in days)					90 years
Employer matching contribution, percent of employees' gross pay	2.00%				3.00%
Defined Benefit Plan, Non-Elective Contributions To Plan Participants, Percentage		2.00%
Employer matching contribution, additional percent of match	50.00%
Employer additional matching contribution, percent of employees' gross pay	6.00%
Compensation expense		$ 10,900	10,600	$ 11,200
Multiemployer Plans, Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded status of plan						$ (900)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 0	$ 0
Expected long-term return on assets (as a percent)		7.00%	7.25%	7.50%
Funded status of plan		$ (42,276)	$ (37,572)
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		241	143
Funded status of plan		(10,518)	(10,041)
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 225	$ 297
Assumed healthcare cost trend (as a percent)		8.00%	8.00%	8.00%
Increase in net periodic postretirement benefit cost if trend increased by 1%		$ 6
Increase in accumulated benefit obligation if trend increased by 1%		211
Decrease in net periodic postretirement benefit cost if trend rate decreased by 1%		6
Decrease in accumulated benefit obligation if trend rate decreased 1%		190
Funded status of plan		$ (3,853)	$ (4,133)

Retirement Benefit Plans (Chang

Retirement Benefit Plans (Changes in Plan Assets and Funded Status of Pension Plans and Other Postretirement Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in plan assets:
Beginning balance	$ 172,976
Ending balance	161,369	$ 172,976
Webster Pension [Member]
Change in benefit obligation:
Beginning balance	210,548	171,189
Service cost	45	40	$ 40
Interest cost	8,008	8,068	7,365
Actuarial (gain) loss	(8,588)	38,472
Benefit payments, administrative expenses, and interest income, net	(6,368)	(7,221)
Ending balance	203,645	210,548	171,189
Change in plan assets:
Beginning balance	172,976	162,182
Actual return on plan assets	(5,239)	18,015
Employer contributions	0	0
Benefits paid and administrative expenses	(6,368)	(7,221)
Ending balance	161,369	172,976	162,182
Funded status of the plan at year end	(42,276)	(37,572)
Webster SERP [Member]
Change in benefit obligation:
Beginning balance	10,041	8,675
Service cost	0	0	0
Interest cost	345	364	289
Actuarial (gain) loss	373	1,145
Benefit payments, administrative expenses, and interest income, net	(241)	(143)
Ending balance	10,518	10,041	8,675
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	241	143
Benefits paid and administrative expenses	(241)	(143)
Ending balance	0	0	0
Funded status of the plan at year end	(10,518)	(10,041)
Postretirement Health Coverage [Member]
Change in benefit obligation:
Beginning balance	4,133	3,821
Service cost	0	0	0
Interest cost	123	139	109
Actuarial (gain) loss	(178)	470
Benefit payments, administrative expenses, and interest income, net	(225)	(297)
Ending balance	3,853	4,133	3,821
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	225	297
Benefits paid and administrative expenses	(225)	(297)
Ending balance	0	0	$ 0
Funded status of the plan at year end	$ (3,853)	$ (4,133)

Retirement Benefit Plans (Amoun

Retirement Benefit Plans (Amount Recognized in the Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued expenses and other liabilities	$ (42,276)	$ (37,572)
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued expenses and other liabilities	(10,518)	(10,041)
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued expenses and other liabilities	$ (3,853)	$ (4,133)

Retirement Benefit Plans (Summa

Retirement Benefit Plans (Summary of Components of Accumulated Other Comprehensive Loss Related to Pensions and Postretirement Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Deferred tax benefit	$ 918	$ 11,147	$ (10,812)
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	73,238	70,437
Prior service cost	0	0
Total pre-tax amounts included in accumulated other comprehensive loss	73,238	70,437
Deferred tax benefit	26,447	25,415
Amounts included in accumulated other comprehensive loss, net of tax	46,791	45,022
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	2,412	2,430
Prior service cost	0	0
Total pre-tax amounts included in accumulated other comprehensive loss	2,412	2,430
Deferred tax benefit	871	877
Amounts included in accumulated other comprehensive loss, net of tax	1,541	1,553
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	591	816
Prior service cost	14	87
Total pre-tax amounts included in accumulated other comprehensive loss	605	903
Deferred tax benefit	218	326
Amounts included in accumulated other comprehensive loss, net of tax	$ 387	$ 577

Retirement Benefit Plans (Expec

Retirement Benefit Plans (Expected Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
2,016	$ 7,034
2,017	7,785
2,018	8,425
2,019	8,728
2,020	9,050
2021-2025	52,144
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
2,016	4,015
2,017	928
2,018	801
2,019	5,597
2,020	142
2021-2025	679
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
2,016	391
2,017	388
2,018	380
2,019	367
2,020	349
2021-2025	$ 1,441

Retirement Benefit Plans (Su121

Retirement Benefit Plans (Summary of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 45	$ 40	$ 40
Interest cost on benefit obligations	8,008	8,068	7,365
Expected return on plan assets	(11,873)	(11,495)	(11,114)
Amortization of prior service cost	0	0	0
Recognized net loss	5,724	2,781	6,355
Net periodic benefit cost (benefit)	1,904	(606)	2,646
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost on benefit obligations	345	364	289
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	0
Recognized net loss	390	135	125
Net periodic benefit cost (benefit)	735	499	414
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost on benefit obligations	123	139	109
Expected return on plan assets	0	0	0
Amortization of prior service cost	73	73	73
Recognized net loss	47	5	0
Net periodic benefit cost (benefit)	$ 243	$ 217	$ 182

Retirement Benefit Plans (Ch122

Retirement Benefit Plans (Changes in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain)	$ 5,367	$ 30,683	$ (26,949)
Amounts reclassified from accumulated other comprehensive income	(2,809)	(37)	(3,169)
Total defined benefit pension and postretirement benefit plans	2,485	30,573	(30,191)
Webster Pension [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain)	8,525	31,951	(23,238)
Amounts reclassified from accumulated other comprehensive income	(5,724)	(2,781)	(6,355)
Amortization of prior service cost	0	0	0
Total defined benefit pension and postretirement benefit plans	2,801	29,170	(29,593)
Webster SERP [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain)	372	1,145	(160)
Amounts reclassified from accumulated other comprehensive income	(390)	(134)	(125)
Amortization of prior service cost	0	0	0
Total defined benefit pension and postretirement benefit plans	(18)	1,011	(285)
Postretirement Health Coverage [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net loss (gain)	(178)	470	(239)
Amounts reclassified from accumulated other comprehensive income	(47)	(5)	0
Amortization of prior service cost	(73)	(73)	(73)
Total defined benefit pension and postretirement benefit plans	$ (298)	$ 392	$ (312)

Retirement Benefit Plans (Su123

Retirement Benefit Plans (Summary of Fair Value of Plan Assets by Level) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 161,369	$ 172,976
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	28,624	29,158
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	131,811	142,741
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	934	1,077	$ 1,196
Exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	28,329	28,287
Exchange traded funds [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	28,329	28,287
Exchange traded funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Exchange traded funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	295	871
Cash and cash equivalents [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	295	871
Cash and cash equivalents [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Cash and cash equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	80,783	94,928
Fixed Income Funds [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	80,783	94,928
Fixed Income Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	51,028	47,813
Equity Funds [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	51,028	47,813
Equity Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Insurance Company Investment Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	934	1,077
Insurance Company Investment Contract [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Insurance Company Investment Contract [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Insurance Company Investment Contract [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 934	$ 1,077

Retirement Benefit Plans (Ch124

Retirement Benefit Plans (Changes in Fair Value of Level 3 Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	$ 172,976
Ending balance	161,369	$ 172,976
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	1,077	1,196
Unrealized gains relating to instruments still held at the reporting date	(28)	(2)
Benefit payments, administrative expenses, and interest income, net	(115)	(117)
Ending balance	$ 934	$ 1,077

Retirement Benefit Plans (Defin

Retirement Benefit Plans (Defined Benefit, Information about Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	100.00%
Percentage of plan assets	100.00%	100.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	50.00%
Percentage of plan assets	51.00%	56.00%
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	50.00%
Percentage of plan assets	49.00%	44.00%

Retirement Benefit Plans (Weigh

Retirement Benefit Plans (Weighted Average Assumptions used to Determine Benefit Obligations) (Details)	Dec. 31, 2015	Dec. 31, 2014
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	4.20%	3.85%
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.75%	3.50%
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.35%	3.15%

Retirement Benefit Plans (We127

Retirement Benefit Plans (Weighted Average Assumptions used to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Assumed healthcare cost trend (as a percent)	8.00%
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.85%	4.80%	3.90%
Expected long-term return on assets (as a percent)	7.00%	7.25%	7.50%
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.50%	4.25%	3.40%
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.15%	3.75%	2.85%
Assumed healthcare cost trend (as a percent)	8.00%	8.00%	8.00%

Retirement Benefit Plans (Contr

Retirement Benefit Plans (Contributions and Funding Status of the Fund) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Contributions by Webster Bank	$ 340	$ 765	$ 870
Funded Status of Plan	At least 80 percent

Share-Based Plans (Narrative) (

Share-Based Plans (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	10,900,000
Number of common shares available for grant	1,300,000
Vesting period (in years)	1 year
Options granted, Number of Shares	377,598	0
Weighted average grant date fair value (in dollars per share)			$ 10.96
Expected term (in years)			6 years 10 months 24 days
Expected dividend rate (as a percent)			1.80%
Expected forfeiture rate (as a percent)			10.00%
Expected volatility (as a percent)			58.97%
Risk-free interest rate (as a percent)			1.36%
Weighted-average remaining contractual term for options expected to vest (in years)	7 years 2 months 12 days
Aggregate intrinsic value of options outstanding, options exercisable, and options expected to vest	$ 22.5	$ 21	$ 1.5
Total intrinsic value of options exercised	$ 4.3	1.9	1.8
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, Granted (in shares)	0
Time Based Restricted Stock Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Time Based Restricted Stock Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, Granted (in shares)	223,190
Fair value of restricted stock awards	$ 11.6	$ 9.4	$ 5.1
Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares available for grant	100,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, Granted (in shares)	138,591
Vesting period (in years)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Performance Shares [Member] \| Minimum [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%	0.00%
Performance Shares [Member] \| Minimum [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Performance Shares [Member] \| Maximum [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%	150.00%
Performance Shares [Member] \| Maximum [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term (in years)	10 years
Options granted, Number of Shares	0
Number of options outstanding (in shares)	1,527,074	1,900,144
Employee Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Employee Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Non-Qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	1,388,957
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	138,117

Share-Based Plans (Summary of S

Share-Based Plans (Summary of Stock-based Compensation Expense Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 10,935	$ 10,223	$ 10,664
Income tax benefit	3,903	3,553	5,344
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	379	1,175	3,902
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 10,556	$ 9,048	$ 6,762

Share-Based Plans (Summary of U

Share-Based Plans (Summary of Unrecognized Compensation Expense) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Stock options	$ 43
Weighted-Average Period To Be Recognized (in years)	1 month 6 days
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Restricted stock	$ 10,937
Weighted-Average Period To Be Recognized (in years)	1 year 10 months 24 days

Share-Based Plans (Summary of R

Share-Based Plans (Summary of Restricted Stock and Stock Option Activity) (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options granted, Number of Shares		377,598	0
Options exercised, Number of Shares		(58,473)
Options exercisable, at end of period, Number of Shares		1,420,758
Options expected to vest, at end of period, Number of Shares		105,378
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Options exercisable, at end of period, Weighted-Average Exercise Price (in dollars per share)		$ 23.99
Options expected to vest, at end of period, Weighted-Average Exercise Price (in dollars per share)		$ 23
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock, Outstanding at beginning of period (in shares)		243,015
Restricted stock, Granted (in shares)		223,190
Restricted stock, Vested restricted stock awards (in shares)	[1]	(220,866)
Restricted stock, Forfeited (in shares)		(9,194)
Restricted stock, Outstanding at end of period (in shares)		236,145	243,015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted stock, at beginning of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 27.03
Restricted stock, Granted (in dollars per share)		34.82
Restricted stock, Vested restricted stock awards (in dollars per share)	[1]	28.83
Restricted stock, Forfeited (in dollars per share)		30.27
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 32.58	$ 27.03
Time Based Restricted Stock Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock, Outstanding at beginning of period (in shares)		2,279
Restricted stock, Granted (in shares)		12,531
Restricted stock, Vested restricted stock awards (in shares)	[1]	(12,722)
Restricted stock, Forfeited (in shares)		0
Restricted stock, Outstanding at end of period (in shares)		2,088	2,279
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted stock, at beginning of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 29.34
Restricted stock, Granted (in dollars per share)		34.45
Restricted stock, Vested restricted stock awards (in dollars per share)	[1]	33.53
Restricted stock, Forfeited (in dollars per share)		0
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 34.45	$ 29.34
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock, Outstanding at beginning of period (in shares)		130,193
Restricted stock, Granted (in shares)		138,591
Restricted stock, Vested restricted stock awards (in shares)	[1]	(153,063)
Restricted stock, Forfeited (in shares)		0
Restricted stock, Outstanding at end of period (in shares)		115,721	130,193
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted stock, at beginning of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 28.61
Restricted stock, Granted (in dollars per share)		36.15
Restricted stock, Vested restricted stock awards (in dollars per share)	[1]	31.27
Restricted stock, Forfeited (in dollars per share)		0
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 34.14	$ 28.61
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, at beginning of period, Number of Shares		1,900,144
Options granted, Number of Shares		0
Options exercised, Number of Shares		(221,320)
Options forfeited, Number of Shares		(151,750)
Options outstanding, at end of period, Number of Shares		1,527,074	1,900,144
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Options, at beginning of period, Weighted-average Exercise Price (in dollars per share)		$ 24.95
Options granted, Weighted-Average Exercise Price (in dollars per share)		0
Options exercised, Weighted-Average Exercise Price (in dollars per share)		18.09
Options forfeited, Weighted-Average Exercise Price (in dollars per share)		45.36
Options, at end of period, Weighted-average Exercise Price (in dollars per share)		$ 23.92	$ 24.95

[1]	Vested for purposes of recording compensation expense.

Share-Based Plans (Options Outs

Share-Based Plans (Options Outstanding and Options Exercisable) (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares \| shares	1,527,074
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	4 years
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 23.92
Options Exercisable, Number of Shares \| shares	1,420,758
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	3 years 9 months 18 days
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 23.99
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	5.14
Upper Range Limit (in dollars per share)	$ 20
Options Outstanding, Number of Shares \| shares	448,941
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	3 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 9.67
Options Exercisable, Number of Shares \| shares	448,941
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	3 years 2 months 12 days
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 9.67
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	20.01
Upper Range Limit (in dollars per share)	$ 30
Options Outstanding, Number of Shares \| shares	672,339
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	6 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 23.54
Options Exercisable, Number of Shares \| shares	566,023
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	5 years 10 months 24 days
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 23.65
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	30.01
Upper Range Limit (in dollars per share)	$ 40
Options Outstanding, Number of Shares \| shares	192,518
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	2 years
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 32.03
Options Exercisable, Number of Shares \| shares	192,518
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	2 years
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 32.03
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	40.01
Upper Range Limit (in dollars per share)	$ 48.88
Options Outstanding, Number of Shares \| shares	213,276
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	1 year
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 47.77
Options Exercisable, Number of Shares \| shares	213,276
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	1 year
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 47.77

Segment Reporting - Operating R

Segment Reporting - Operating Results and Total Assets Reportable Segments (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)Segment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments \| Segment									4
Net interest income (loss)	$ 173,340	$ 168,010	$ 163,511	$ 159,764	$ 160,648	$ 157,370	$ 155,122	$ 155,301	$ 664,625	$ 628,441	$ 596,728
Provision for loan and lease losses	13,800	13,000	12,750	9,750	9,500	9,500	9,250	9,000	49,300	37,250	33,500
Net interest income (loss) after provision for loan and lease losses									615,325	591,191	563,228
Non-interest income									239,545	202,108	191,050
Non-interest expense	143,164	139,854	137,446	134,090	130,164	124,498	122,475	124,463	554,554	501,600	497,709
Income before income tax expense	76,725	76,611	73,166	73,814	74,759	74,281	70,993	71,666	300,316	291,699	256,569
Income tax expense (benefit)	24,146	25,075	20,663	24,092	23,753	23,824	23,159	21,237	93,976	91,973	77,113
Net income	52,579	$ 51,536	$ 52,503	$ 49,722	51,006	$ 50,457	$ 47,834	$ 50,429	206,340	199,726	179,456
Total Assets	24,677,820				22,533,172				24,677,820	22,533,172	20,853,145
Operating Segments [Member] \| Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)									255,845	238,186	217,582
Provision for loan and lease losses									30,160	13,088	17,971
Net interest income (loss) after provision for loan and lease losses									225,685	225,098	199,611
Non-interest income									37,784	37,270	30,797
Non-interest expense									109,718	102,374	99,801
Income before income tax expense									153,751	159,994	130,607
Income tax expense (benefit)									48,112	50,446	39,260
Net income									105,639	109,548	91,347
Total Assets	7,505,513				6,550,868				7,505,513	6,550,868	5,682,129
Operating Segments [Member] \| Community Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)									354,709	354,781	347,395
Provision for loan and lease losses									19,603	26,345	19,219
Net interest income (loss) after provision for loan and lease losses									335,106	328,436	328,176
Non-interest income									108,604	103,543	116,182
Non-interest expense									330,692	324,312	337,795
Income before income tax expense									113,018	107,667	106,563
Income tax expense (benefit)									35,366	33,947	32,029
Net income									77,652	73,720	74,534
Total Assets	8,441,950				8,123,928				8,441,950	8,123,928	7,738,597
Operating Segments [Member] \| HSA Bank [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)									73,433	38,822	32,807
Provision for loan and lease losses									0	0	0
Net interest income (loss) after provision for loan and lease losses									73,433	38,822	32,807
Non-interest income									64,243	28,553	21,963
Non-interest expense									80,662	40,900	29,962
Income before income tax expense									57,014	26,475	24,808
Income tax expense (benefit)									17,841	8,311	7,423
Net income									39,173	18,164	17,385
Total Assets	95,815				26,680				95,815	26,680	19,524
Operating Segments [Member] \| Private Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)									10,240	8,877	8,185
Provision for loan and lease losses									386	765	397
Net interest income (loss) after provision for loan and lease losses									9,854	8,112	7,788
Non-interest income									9,183	9,843	10,963
Non-interest expense									19,781	18,691	19,783
Income before income tax expense									(744)	(736)	(1,032)
Income tax expense (benefit)									(233)	(232)	(310)
Net income									(511)	(504)	(722)
Total Assets	493,571				398,893				493,571	398,893	346,338
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)									(29,602)	(12,225)	(9,241)
Provision for loan and lease losses									(849)	(2,948)	(4,087)
Net interest income (loss) after provision for loan and lease losses									(28,753)	(9,277)	(5,154)
Non-interest income									19,731	22,899	11,145
Non-interest expense									13,701	15,323	10,368
Income before income tax expense									(22,723)	(1,701)	(4,377)
Income tax expense (benefit)									(7,110)	(499)	(1,289)
Net income									(15,613)	(1,202)	(3,088)
Total Assets	$ 8,140,971				$ 7,432,803				$ 8,140,971	$ 7,432,803	$ 7,066,557

Commitments and Contingencie135

Commitments and Contingencies (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rental expense under leases	$ 21.5	$ 20.5	$ 20.3
Rental income	$ 0.8	$ 0.8	$ 0.9

Commitments and Contingencie136

Commitments and Contingencies (Schedule of Future Minimum Rental Payments and Receipts for Leases) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
Rental Payments, 2016	$ 25,218
Rental Payments, 2017	23,140
Rental Payments, 2018	18,998
Rental Payments, 2019	17,227
Rental Payments, 2020	15,561
Rental Payments, Thereafter	84,114
Rental Payments, Total	184,258
Rental Receipts, 2016	690
Rental Receipts, 2017	422
Rental Receipts, 2018	248
Rental Receipts, 2019	147
Rental Receipts, 2020	89
Rental Receipts, Thereafter	84
Rental Receipts, Total	$ 1,680

Commitments and Contingencie137

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 5,031,030	$ 4,547,484
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	133,294	142,964
Letter of Credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	45,742	27,787
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 4,851,994	$ 4,376,733

Commitments and Contingencie138

Commitments and Contingencies (Schedule for Unfunded Commitments) (Details) - Reserve for Off-balance Sheet Activities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 5,151	$ 4,384	$ 5,662
(Benefit) provision	(3,032)	767	(1,278)
Ending balance	$ 2,119	$ 5,151	$ 4,384

Parent Company Information (Com

Parent Company Information (Components of Condensed Balance Sheets The Parent Company) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 251,258	$ 261,544	$ 223,616	$ 252,283
Securities available-for-sale, at fair value	2,984,631	2,793,873
Other assets	328,993	301,670
Total assets	24,677,820	22,533,172	20,853,145
Liabilities and shareholders’ equity:
Total liabilities	22,262,249	20,210,357
Total liabilities and shareholders' equity	24,677,820	22,533,172
Parent Company [Member]
Assets:
Cash and due from banks	279,644	272,492	$ 273,573	$ 230,201
Securities available-for-sale, at fair value	2,578	5,902
Investment in subsidiaries	2,347,068	2,249,910
Due to subsidiaries	(48)	(165)
Alternative investments	6,795	10,046
Other assets	16,359	14,356
Total assets	2,652,396	2,552,541
Liabilities and shareholders’ equity:
Senior notes	149,036	148,917
Junior subordinated debt	77,320	77,320
Accrued interest payable	2,591	2,582
Other liabilities	7,878	907
Total liabilities	236,825	229,726
Shareholders’ equity	2,415,571	2,322,815
Total liabilities and shareholders' equity	$ 2,652,396	$ 2,552,541

Parent Company Information (140

Parent Company Information (Components of Condensed Income Statement The Parent Company) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Income:
Gain on sale of investment securities, net	$ 80	$ 0	$ 486	$ 43	$ 1,121	$ 42	$ 0	$ 4,336	$ 609	$ 5,499	$ 712
Other non-interest income	60,297	61,537	59,365	57,847	53,553	50,952	47,669	45,580
Operating Expense:
Compensation and benefits									297,517	270,151	264,835
Other non-interest expense									70,584	73,101	72,687
Income tax benefit	$ (24,146)	$ (25,075)	$ (20,663)	$ (24,092)	$ (23,753)	$ (23,824)	$ (23,159)	$ (21,237)	(93,976)	(91,973)	(77,113)
Parent Company [Member]
Operating Income:
Dividend income from bank subsidiary									110,000	100,000	90,000
Interest on securities and interest-bearing deposits									546	613	1,025
Gain on sale of investment securities, net									0	1,185	1,273
Alternative investments income (loss)									2,274	804	(392)
Other non-interest income									152	151	152
Total operating income									112,972	102,753	92,058
Operating Expense:
Interest expense on borrowings									9,665	10,041	7,273
Compensation and benefits									10,965	10,290	10,787
Other non-interest expense									6,005	4,562	5,966
Total operating expense									26,635	24,893	24,026
Income before income tax benefit and equity in undistributed earnings of subsidiaries and associated companies									86,337	77,860	68,032
Income tax benefit									2,929	8,798	9,742
Equity in undistributed earnings of subsidiaries and associated companies									117,074	113,068	101,682
Net income									$ 206,340	$ 199,726	$ 179,456

Parent Company Information (141

Parent Company Information (Components of Condensed Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other comprehensive loss, net of tax:
Net unrealized (losses) gains on available for sale securities	$ (22,828)	$ 19,038	$ (45,358)
Net unrealized gains (losses) on derivative instruments	(3,136)	(12,506)	3,744
Other comprehensive loss of subsidiaries and associated companies	184,495	192,014	163,173
Other comprehensive loss, net of tax	(21,845)	(7,712)	(16,283)
Parent Company [Member]
Condensed Statement of Income Captions [Line Items]
Net income	206,340	199,726	179,456
Other comprehensive loss, net of tax:
Net unrealized (losses) gains on available for sale securities	(2,109)	725	(616)
Net unrealized gains (losses) on derivative instruments	1,223	(2,932)	1,152
Other comprehensive loss of subsidiaries and associated companies	(20,959)	(5,505)	(16,819)
Other comprehensive loss, net of tax	(21,845)	(7,712)	(16,283)
Comprehensive income	$ 184,495	$ 192,014	$ 163,173

Parent Company Information (142

Parent Company Information (Components of Condensed Cash Flow The Parent Company) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Stock-based compensation	$ 10,935	$ 10,223	$ 10,664
Net cash provided by operating activities	307,185	272,815	463,953
Investing activities:
Purchases of available-for-sale securities	(903,240)	(217,920)	(952,995)
Proceeds from sales of available-for-sale securities	123,270	98,402	57,804
Net cash (used for) provided by investing activities	(774,642)	(1,669,670)	(1,137,123)
Financing activities:
Issuance of long-term debt	0	150,000	0
Repayment of long-term debt	0	(150,000)	(102,579)
Cash dividends paid to common shareholders	(80,964)	(67,431)	(48,952)
Cash dividends paid to preferred shareholders	(8,711)	(10,556)	(10,803)
Exercise of stock options	3,060	2,221	2,736
Excess tax benefits from stock-based compensation	2,338	1,161	389
Common stock issued	0	435	731
Common stock repurchased/shares acquired related to employee share-based plans	(12,564)	(10,741)	0
Common stock warrants repurchased	(23)	(3)	(30)
Net cash (used for) provided by financing activities	457,171	1,434,783	644,503
Net (decrease) increase in cash and due from banks	(10,286)	37,928	(28,667)
Cash and due from banks at beginning of period	261,544	223,616	252,283
Cash and due from banks at end of period	251,258	261,544	223,616
Parent Company [Member]
Operating activities:
Net income	206,340	199,726	179,456
Equity in undistributed earnings of subsidiaries and associated companies	(117,074)	(113,068)	(101,682)
Stock-based compensation	10,935	10,223	10,664
Other, net	9,066	(10,721)	(1,934)
Net cash provided by operating activities	109,267	86,160	86,504
Investing activities:
Purchases of available-for-sale securities	0	(3,500)	(75)
Proceeds from sales of available-for-sale securities	0	3,499	13,544
Net cash (used for) provided by investing activities	0	(1)	13,469
Financing activities:
Issuance of long-term debt	0	150,000	0
Repayment of long-term debt	0	(150,000)	0
Cash dividends paid to common shareholders	(80,964)	(67,431)	(48,952)
Cash dividends paid to preferred shareholders	(8,711)	(10,556)	(10,803)
Exercise of stock options	3,060	2,221	2,736
Excess tax benefits from stock-based compensation	2,338	1,161	389
Common stock issued	0	435	731
Common stock repurchased/shares acquired related to employee share-based plans	(17,815)	(13,067)	(672)
Common stock warrants repurchased	(23)	(3)	(30)
Net cash (used for) provided by financing activities	(102,115)	(87,240)	(56,601)
Net (decrease) increase in cash and due from banks	7,152	(1,081)	43,372
Cash and due from banks at beginning of period	272,492	273,573	230,201
Cash and due from banks at end of period	$ 279,644	$ 272,492	$ 273,573

Selected Quarterly Consolida143

Selected Quarterly Consolidated Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Interest income	$ 198,160	$ 191,998	$ 186,970	$ 182,912	$ 183,751	$ 179,914	$ 177,497	$ 177,779	$ 760,040	$ 718,941	$ 687,640
Interest expense	24,820	23,988	23,459	23,148	23,103	22,544	22,375	22,478	95,415	90,500	90,912
Net interest income	173,340	168,010	163,511	159,764	160,648	157,370	155,122	155,301	664,625	628,441	596,728
Provision for loan and lease losses	13,800	13,000	12,750	9,750	9,500	9,500	9,250	9,000	49,300	37,250	33,500
Non-interest income (less securities amounts)	60,297	61,537	59,365	57,847	53,553	50,952	47,669	45,580
Gain on sale of investment securities, net	80	0	486	43	1,121	42	0	4,336	609	5,499	712
Impairment loss recognized in earnings	(28)	(82)	0	0	(899)	(85)	(73)	(88)	(110)	(1,145)	(7,277)
Non-interest expense	143,164	139,854	137,446	134,090	130,164	124,498	122,475	124,463	554,554	501,600	497,709
Income before income tax expense	76,725	76,611	73,166	73,814	74,759	74,281	70,993	71,666	300,316	291,699	256,569
Income tax expense	24,146	25,075	20,663	24,092	23,753	23,824	23,159	21,237	93,976	91,973	77,113
Net income	52,579	51,536	52,503	49,722	51,006	50,457	47,834	50,429	206,340	199,726	179,456
Earnings applicable to common shareholders	$ 50,414	$ 49,341	$ 50,277	$ 46,937	$ 48,224	$ 47,647	$ 45,008	$ 47,617	$ 197,629	$ 189,170	$ 168,653
Earnings per common share:
Earnings per common share, Basic (in dollars per share)	$ 0.55	$ 0.54	$ 0.55	$ 0.52	$ 0.54	$ 0.53	$ 0.50	$ 0.53	$ 2.17	$ 2.10	$ 1.90
Earnings per common share, Diluted (in dollars per share)	$ 0.55	$ 0.54	$ 0.55	$ 0.52	$ 0.53	$ 0.53	$ 0.50	$ 0.53	$ 2.15	$ 2.08	$ 1.86