Webster Financial (WBS) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 29, 2016
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
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		91,661,145

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Assets:
Cash and due from banks		$ 198,174	$ 199,693
Interest-bearing deposits		27,805	155,907
Securities available-for-sale		3,080,469	2,984,631
Securities held-to-maturity (fair value of $4,094,506 and $3,961,534)		4,012,289	3,923,052
Federal Home Loan Bank and Federal Reserve Bank stock		188,347	188,347
Loans held for sale (valued under fair value option $27,273 and $0)		30,425	37,091
Loans and leases	[1]	15,858,355	15,671,735
Allowance for loan and lease losses		(174,201)	(174,990)
Loans and leases, net		15,684,154	15,496,745
Deferred tax asset, net		81,191	101,578
Premises and equipment, net		134,212	129,426
Goodwill		538,373	538,373
Other intangible assets, net		37,772	39,326
Cash surrender value of life insurance policies		506,746	503,093
Accrued interest receivable and other assets		415,552	345,625
Total assets		24,935,509	24,642,887
Liabilities and shareholders' equity:
Non-interest-bearing		3,625,605	3,713,063
Interest-bearing		15,098,918	14,239,715
Total deposits		18,724,523	17,952,778
Securities sold under agreements to repurchase and other borrowings		910,149	1,151,400
Federal Home Loan Bank advances		2,363,131	2,664,139
Long-term debt		225,323	225,260
Accrued expenses and other liabilities		274,416	233,739
Total liabilities		22,497,542	22,227,316
Shareholders’ equity:
Common stock, $.01 par value: Authorized - 200,000,000 shares: Issued (93,651,601 shares)		937	937
Paid-in capital		1,125,925	1,124,325
Retained earnings		1,342,930	1,317,559
Treasury stock, at cost (2,272,448 and 2,090,409 shares)		(84,138)	(71,854)
Accumulated other comprehensive loss, net of tax		(70,397)	(78,106)
Total shareholders' equity		2,437,967	2,415,571
Total liabilities and shareholders' equity		24,935,509	24,642,887
Series E Preferred Stock [Member]
Shareholders’ equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series E issued and outstanding (5,060 shares)		$ 122,710	$ 122,710
[1]	Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015, respectively.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Securities held-to-maturity ,fair value	$ 4,094,506	$ 3,961,534
Originated loans held for sale	$ 27,273	$ 0
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	93,651,601	93,651,601
Treasury stock ,shares (in shares)	2,272,448	2,090,409
Series E Preferred Stock [Member]
Preferred stock, shares issued (in shares)	5,060	5,060
Preferred stock, shares outstanding (in shares)	5,060	5,060

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Income:
Interest and fees on loans and leases	$ 149,808	$ 130,723
Taxable interest and dividends on securities	48,039	47,652
Non-taxable interest on securities	4,215	4,027
Loans held for sale	273	510
Total interest income	202,335	182,912
Interest Expense:
Deposits	12,299	11,542
Securities sold under agreements to repurchase and other borrowings	4,173	4,387
Federal Home Loan Bank advances	7,247	4,821
Long-term debt	2,464	2,398
Total interest expense	26,183	23,148
Net interest income	176,152	159,764
Provision for loan and lease losses	15,600	9,750
Net interest income after provision for loan and lease losses	160,552	150,014
Non-interest Income:
Deposit service fees	36,382	32,625
Loan and lease related fees	5,675	5,679
Wealth and investment services	7,195	7,889
Mortgage banking activities	2,629	1,561
Increase in cash surrender value of life insurance policies	3,653	3,152
Gain on sale of investment securities, net	320	43
Impairment loss on securities recognized in earnings	(149)	0
Other income	8,319	6,941
Total non-interest income	64,024	57,890
Non-interest Expense:
Compensation and benefits	80,309	70,864
Occupancy	14,253	13,596
Technology and equipment	19,235	19,248
Intangible assets amortization	1,554	1,288
Marketing	4,924	4,176
Professional and outside services	2,811	2,453
Deposit insurance	6,786	6,241
Other expense	21,870	16,224
Total non-interest expense	151,742	134,090
Income before income tax expense	72,834	73,814
Income tax expense	24,217	24,092
Net income	48,617	49,722
Preferred stock dividends and other	(2,131)	(2,785)
Earnings applicable to common shareholders	$ 46,486	$ 46,937
Earnings per common share:
Basic (in dollars per share)	$ 0.51	$ 0.52
Diluted (in dollars per share)	$ 0.51	$ 0.52

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 48,617	$ 49,722
Other comprehensive income (loss), net of tax:
Total available-for-sale and transferred securities	7,505	6,967
Total derivative instruments	(952)	(1,770)
Total defined benefit pension and other postretirement benefit plans	1,156	974
Other comprehensive income, net of tax	7,709	6,171
Comprehensive income	$ 56,326	$ 55,893

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - 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, 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	49,722						49,722
Other comprehensive income, net of tax	6,171										6,171
Dividends and dividend equivalents declared on common stock $0.23 and $0.20 per share during 3 months ended March 31, 2016 and 2015, respectively	(18,136)					25	(18,161)
Dividends on Series A preferred stock $21.25 per share and Series E preferred stock $400.00 per share for the 3 months ended March 31, 2016 and 2015, respectively		$ (615)	$ (2,024)					$ (615)	$ (2,024)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	3,385					1,471	(357)			2,271
Exercise of stock options	261					(133)				394
Shares acquired related to employee share-based compensation plans	(3,379)									(3,379)
Common stock repurchased	(2,625)									(2,625)
Ending Balance at Mar. 31, 2015	2,355,575			151,649	936	1,128,897	1,230,816			(106,633)	(50,090)
Beginning Balance at Dec. 31, 2015	2,415,571			122,710	937	1,124,325	1,317,559			(71,854)	(78,106)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,617						48,617
Other comprehensive income, net of tax	7,709										7,709
Dividends and dividend equivalents declared on common stock $0.23 and $0.20 per share during 3 months ended March 31, 2016 and 2015, respectively	(21,139)					32	(21,171)
Dividends on Series A preferred stock $21.25 per share and Series E preferred stock $400.00 per share for the 3 months ended March 31, 2016 and 2015, respectively			$ (2,024)						$ (2,024)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	4,725					2,138	(51)			2,638
Exercise of stock options	302					(407)				709
Shares acquired related to employee share-based compensation plans	(4,425)									(4,425)
Common stock repurchased	(11,206)									(11,206)
Common stock warrants repurchased	(163)					(163)
Ending Balance at Mar. 31, 2016	$ 2,437,967			$ 122,710	$ 937	$ 1,125,925	$ 1,342,930			$ (84,138)	$ (70,397)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Dividends on common stock and dividend equivalents declared (in dollars per share)	$ 0.23	$ 0.2
Series A Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)		21.25
Series E Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)	$ 400	$ 400

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net income	$ 48,617	$ 49,722
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	15,600	9,750
Deferred tax expense	16,847	10,138
Depreciation and amortization	8,921	8,099
Amortization of earning assets and funding, premium/discount, net	12,215	12,955
Stock-based compensation	2,783	2,282
(Gain) loss on sale, net of write-down, on foreclosed and repossessed assets	(378)	536
Loss (gain) on sale, net of write-down, on premises and equipment	288	(373)
Impairment loss recognized in earnings	149	0
Gain on the sale of investment securities, net	(320)	(43)
Increase in cash surrender value of life insurance policies	(3,653)	(3,152)
Gain, net on mortgage banking activities	(2,629)	(1,561)
Proceeds from sale of loans held for sale	85,161	76,895
Origination of loans held for sale	(73,491)	(86,882)
Net increase in accrued interest receivable and other assets	(72,259)	(38,337)
Net decrease in accrued expenses and other liabilities	(25,193)	(4,088)
Net cash provided by operating activities	12,658	35,941
Investing Activities:
Net decrease in interest-bearing deposits	128,102	13,398
Purchases of available for sale securities	(190,431)	(236,668)
Proceeds from maturities and principal payments of available for sale securities	125,534	137,874
Proceeds from sales of available for sale securities	43,211	27,859
Purchases of held-to-maturity securities	(222,906)	(201,182)
Proceeds from maturities and principal payments of held-to-maturity securities	126,999	143,891
Net increase in loans	(215,546)	(380,155)
Proceeds from sale of loans not originated for sale	8,247	32,915
Proceeds from life insurance policies	0	3,912
Proceeds from the sale of foreclosed and repossessed assets	1,983	3,399
Proceeds from the sale of premises and equipment	0	650
Purchases of premises and equipment	(12,441)	(8,437)
Acquisition of business, net cash acquired	0	1,396,414
Net cash (used for) provided by investing activities	(207,248)	933,870
Financing Activities:
Net increase in deposits	771,797	447,021
Proceeds from Federal Home Loan Bank advances	4,545,000	2,800,000
Repayments of Federal Home Loan Bank advances	(4,846,005)	(4,075,070)
Net decrease in securities sold under agreements to repurchase and other borrowings	(241,251)	(166,879)
Dividends paid to common shareholders	(20,913)	(18,029)
Dividends paid to preferred shareholders	(2,024)	(2,639)
Exercise of stock options	302	261
Excess tax benefits from stock-based compensation	1,959	1,109
Common stock repurchased	(11,206)	(2,625)
Shares acquired related to employee share-based compensation plans	(4,425)	(3,379)
Common stock warrants repurchased	(163)	0
Net cash provided by (used for) financing activities	193,071	(1,020,230)
Net decrease in cash and due from banks	(1,519)	(50,419)
Cash and due from banks at beginning of period	199,693	213,914
Cash and due from banks at end of period	198,174	163,495
Supplemental disclosure of cash flow information:
Interest paid	28,301	25,695
Income taxes paid	6,248	12,009
Noncash investing and financing activities:
Transfer of loans from portfolio to loans-held-for-sale	11,186	0
Transfer of loans and leases to foreclosed properties and repossessed assets	1,640	2,722
Deposits assumed in business acquisition	$ 0	$ 1,446,899

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , 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 accounting and reporting policies of the Company that materially affect its financial statements conform with U.S. Generally Accepted Accounting Principles ("GAAP"). The accompanying unaudited Condensed Consolidated Financial Statements of the Company have been prepared in conformity with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and notes required by GAAP for complete financial statements and should be read in conjunction with the Company's Consolidated Financial Statements, and notes thereto, for the year ended December 31, 2015 , included in the Company's Annual Report on Form 10-K filed with the SEC on February 29, 2016. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as income and expense during the period. Actual results could differ from those estimates. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full year or any future period. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on total assets, total liabilities, net cash provided by operating activities, net cash used for investing activities, and net cash provided by financing activities. Correction of Immaterial Error Related to Prior Periods During the three months ended March 31, 2016 , the Company identified an error relating to the accounting for cash collateral associated with derivative instruments. Based on requirements of Financial Accounting Standards Board Accounting Standards Codification ("ASC") 305, Cash and Cash Equivalents , the Company determined the cash collateral was incorrectly classified as cash and due from banks. In accordance with the requirements of FASB ASC 815, Derivatives and Hedging, the variation margin of cash collateral, pertaining to derivatives reported on a net basis, subject to a legally enforceable master netting arrangement, with the same counterparty, are offset against the net derivative position on the Company's Condensed Consolidated Balance Sheets. The cash collateral, relating to the initial margin, is included within accrued interest receivable and other assets on the Company's Condensed Consolidated Balance Sheets. The Company reviewed the impact of this error on the prior periods in accordance with Securities and Exchange Commission Staff Accounting Bulletin No. 99, Materiality, and determined that the error was immaterial to previously reported amounts contained in the Company's annual and quarterly reports. Accordingly, within this Form 10-Q the Company revised its Condensed Consolidated Balance Sheet for December 31, 2015 and its Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2015 . The effects of recording this immaterial correction are as follows: December 31, 2015 (In thousands) As Reported As Revised CONDENSED CONSOLIDATED BALANCE SHEETS Cash and due from banks $ 251,258 $ 199,693 Accrued interest receivable and other assets (1) 328,993 346,721 Accrued expenses and other liabilities 267,576 233,739 Three months ended March 31, 2015 (In thousands) As Reported As Revised CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net increase in accrued interest receivable and other assets $ (33,912 ) $ (38,117 ) Net increase (decrease) in accrued expenses and other liabilities 14,552 (4,088 ) (1) The amount recored as revised excludes the impact of a $1.1 million reclassification of debt issuance cost from accrued interest receivable and other assets into long-term debt. The reclassification was made in accordance with the Company's adoption of ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs, and is not considered part of the error correction. Significant Accounting Policy Updates Loans Held For Sale. Prior to and for the period ended December 31, 2015, residential mortgage loans that were classified as held for sale were accounted for at the lower of cost or fair value method of accounting and were valued on an individual asset basis. Effective January 1, 2016, on a loan by loan election, residential mortgage loans that are classified as held for sale are accounted for under either the fair value option method of accounting or the lower of cost or fair value method of accounting with the election being made at the time the asset is first recognized. The Company has elected the fair value option to mitigate accounting mismatches between held for sale derivative commitments and loan valuations. Loans not originated for sale but subsequently transferred to held for sale continue to be valued at the lower of cost or fair value method of accounting and are valued on an individual asset basis. Financial Accounting Standards Board ("FASB") Standards Adopted during 2016 Effective January 1, 2016, the following new accounting guidance was adopted by the Company: • ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis; • ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs; • ASU No. 2015-07, Fair Value Measurement (Topic 820) - Disclosures for investments in Certain Entities That Calculate New Asset Value per Share (or its Equivalent) (a consensus of the FASB Emerging Issues Task Force); and • ASU No. 2015-16, Business Combinations (Topic 805) - Simplifying the Accounting for Measurement - Period Adjustments. As a result of ASU No. 2015-02, the Company did not identify any additional investments requiring consolidation, however, has included additional disclosures of variable interest entities in Note 3: Variable Interest Entities . The adoption of these accounting standards did not have a material impact on the Company's financial statements. FASB Standards Issued but not yet Adopted 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. 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share Based Payment Accounting. The Update impacts the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. In addition, the amendments in this Update eliminates the guidance in Topic 718 that was indefinitely deferred shortly after the issuance of FASB Statement No. 123 (revised 2004), Share-Based Payment. The Company intends to adopt the Update for the first quarter of 2017 and is in the process of assessing the impact on its financial statements. ASU No. 2016-06, Derivatives and Hedging (Topic 815) - Contingent Put and Call Options in Debt Instruments. The Update clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The Update requires the assessment of embedded call (put) options solely in accordance with the four-step decision sequence. The Company intends to adopt the Update for the first quarter of 2017. Adoption is not anticipated to have a material impact on the Company's financial statements. ASU No. 2016-02, Leases (Topic 842). The Update introduces a lessee model that brings most leases on the balance sheet. The Update also aligns certain of the underlying principles of the new lessor model with those in ASC 606, the FASB’s new revenue recognition standard (e.g., evaluating how collectability should be considered and determining when profit can be recognized). Furthermore, the Update addresses other concerns including the elimination of the required use of bright-line tests for determining lease classification. Lessors are required to provide additional transparency into the exposure to the changes in value of their residual assets and how they manage that exposure. The Company intends to adopt the Update for the first quarter of 2019 and is in the process of assessing the impact on its financial statements. 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. 2014-09, Revenue from Contracts with Customers (Topic 606) ASU No. 2015-14, 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 International Financial Reporting Standards. 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.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 At December 31, 2015 (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 $ 475 $ — $ — $ 475 $ 924 $ — $ — $ 924 Agency collateralized mortgage obligations (“agency CMO”) 511,772 8,918 (948 ) 519,742 546,168 5,532 (2,946 ) 548,754 Agency mortgage-backed securities (“agency MBS”) 1,069,685 8,331 (6,880 ) 1,071,136 1,075,941 6,459 (17,291 ) 1,065,109 Agency commercial mortgage-backed securities (“agency CMBS”) 360,217 4,880 (80 ) 365,017 215,670 639 (959 ) 215,350 Non-agency commercial mortgage-backed securities agency (“non-agency CMBS”) 528,189 5,518 (6,882 ) 526,825 574,686 7,485 (2,905 ) 579,266 Collateralized loan obligations ("CLO") 464,394 525 (3,966 ) 460,953 431,837 592 (3,270 ) 429,159 Single issuer trust preferred securities 42,220 — (8,796 ) 33,424 42,168 — (4,998 ) 37,170 Corporate debt securities 98,406 2,555 — 100,961 104,031 2,290 — 106,321 Equities - financial services 3,499 — (1,563 ) 1,936 3,499 — (921 ) 2,578 Securities available-for-sale $ 3,078,857 $ 30,727 $ (29,115 ) $ 3,080,469 $ 2,994,924 $ 22,997 $ (33,290 ) $ 2,984,631 Held-to-maturity: Agency CMO $ 384,905 $ 6,153 $ (425 ) $ 390,633 $ 407,494 $ 3,717 $ (2,058 ) $ 409,153 Agency MBS 2,086,393 44,832 (6,978 ) 2,124,247 2,030,176 38,813 (19,908 ) 2,049,081 Agency CMBS 678,969 15,549 — 694,518 686,086 4,253 (325 ) 690,014 Municipal bonds and notes 486,777 13,365 (142 ) 500,000 435,905 12,019 (417 ) 447,507 Non-agency CMBS 372,451 9,915 (78 ) 382,288 360,018 5,046 (2,704 ) 362,360 Private Label MBS 2,794 26 — 2,820 3,373 46 — 3,419 Securities held-to-maturity $ 4,012,289 $ 89,840 $ (7,623 ) $ 4,094,506 $ 3,923,052 $ 63,894 $ (25,412 ) $ 3,961,534 Other-Than-Temporary Impairment ("OTTI") 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 Wall Street Reform and Consumer Protection Act of 2010 (the "Dodd-Frank Act"), commonly known as the Volcker Rule. Webster continues to record impairment on CLOs, that are not in compliance with the Volcker Rule, if spreads widen or credit deteriorates. At March 31, 2016, Webster had $132.3 million of CLOs that are non- compliant and continues to transition the portfolio to conform to the Volcker Rule by July 2017. 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: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 3,288 $ 3,696 Reduction for securities sold or called — (99 ) Additions for OTTI not previously recognized 149 — Ending balance $ 3,437 $ 3,597 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 March 31, 2016 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 $ 35,571 $ (166 ) $ 54,475 $ (782 ) 4 $ 90,046 $ (948 ) Agency MBS 129,284 (407 ) 502,745 (6,473 ) 72 632,029 (6,880 ) Agency CMBS 40,249 (80 ) — — 2 40,249 (80 ) Non-agency CMBS 258,733 (6,637 ) 24,782 (245 ) 28 283,515 (6,882 ) CLO 250,385 (3,363 ) 15,670 (603 ) 15 266,055 (3,966 ) Single issuer trust preferred securities 3,654 (568 ) 29,770 (8,228 ) 8 33,424 (8,796 ) Equities - financial services 1,936 (1,563 ) — — 1 1,936 (1,563 ) Total available-for-sale in an unrealized loss position $ 719,812 $ (12,784 ) $ 627,442 $ (16,331 ) 130 $ 1,347,254 $ (29,115 ) Held-to-maturity: Agency CMO $ — $ — $ 50,476 $ (425 ) 3 $ 50,476 $ (425 ) Agency MBS 155,405 (568 ) 625,844 (6,410 ) 58 781,249 (6,978 ) Agency CMBS — — — — — — — Municipal bonds and notes 43,220 (118 ) 4,377 (24 ) 32 47,597 (142 ) Non-agency CMBS 24,532 (72 ) 5,265 (6 ) 3 29,797 (78 ) Total held-to-maturity in an unrealized loss position $ 223,157 $ (758 ) $ 685,962 $ (6,865 ) 96 $ 909,119 $ (7,623 ) 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 services 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 ) 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, in unrealized loss positions, to be other-than-temporarily impaired at March 31, 2016 . Available-for-Sale Securities Agency CMO. There were unrealized losses of $0.9 million on the Company’s investment in agency CMO at March 31, 2016 compared to $2.9 million at December 31, 2015 . Unrealized losses decreased due to lower market rates which resulted in higher security prices at March 31, 2016 compared to December 31, 2015 . These investments are issued by a government or a government-sponsored agency and, therefore, are backed by certain government guarantees, either direct or indirect. 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 $6.9 million on the Company’s investment in agency MBS at March 31, 2016 compared to $17.3 million at December 31, 2015 . Unrealized losses decreased due to lower market rates which resulted in higher security prices at March 31, 2016 compared to December 31, 2015 . These investments are issued by a government or a government-sponsored agency and, therefore, are backed by certain government guarantees, either direct or indirect. There has been no change in the underlying credit quality, and the contractual cash flows for these investments are performing as expected. Non-Agency CMBS. There were unrealized losses of $6.9 million on the Company’s investment in non-agency CMBS at March 31, 2016 compared to $2.9 million at December 31, 2015 . The portfolio of mainly floating rate non-agency CMBS experienced increased market spreads which resulted in lower market prices and greater unrealized losses at March 31, 2016 compared to December 31, 2015 . Internal and external metrics are considered when evaluating potential other-than temporary impairment. Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. Contractual cash flows for these investments are performing as expected. CLO. There were unrealized losses of $4.0 million on the Company's investments in CLOs, that are in compliance with the Volcker Rule, at March 31, 2016 compared to $3.3 million at December 31, 2015. Unrealized losses increased due to higher market spreads for the asset class which resulted in lower security prices since December 31, 2015. Contractual cash flows for these investments are performing as expected. Single issuer trust preferred securities. There were unrealized losses of $8.8 million on the Company's investment in single issuer trust preferred securities at March 31, 2016 compared to $5.0 million at December 31, 2015 . Unrealized losses increased due to higher market spreads for this asset class which resulted in lower security prices compared to December 31, 2015 . 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 services. There were unrealized losses of $1.6 million on the Company’s investment in equities - financial services at March 31, 2016 compared to $0.9 million at December 31, 2015 . When estimating the recovery period for equity securities in an unrealized loss position, management utilizes analyst forecasts, earnings assumptions and other company-specific financial performance metrics. In addition, this assessment incorporates general market data, industry and sector cycles and related trends to determine a reasonable recovery period. The Company evaluated the near-term prospects of the issuers in relation to the severity and duration of the impairment. The Company determined its holdings of equity securities were not deemed to be other-than-temporarily impaired at both March 31, 2016 and December 31, 2015 . Held-to-Maturity Securities Agency CMO. There were unrealized losses of $0.4 million on the Company’s investment in agency CMO at March 31, 2016 compared to $2.1 million at December 31, 2015 . Unrealized losses decreased due to lower market rates which resulted in higher security prices at March 31, 2016 compared to December 31, 2015 . These investments are issued by a government or a government-sponsored agency and, therefore, are backed by certain government guarantees, either direct or indirect. 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 $7.0 million on the Company’s investment in agency MBS at March 31, 2016 compared to $19.9 million at December 31, 2015 . Unrealized losses decreased due to lower market rates which resulted in higher security prices at March 31, 2016 compared to December 31, 2015 . These investments are issued by a government or a government-sponsored agency and, therefore, are backed by certain government guarantees, either direct or indirect. There has been no change in the underlying credit quality, and the contractual cash flows are performing as expected. Non-agency CMBS. There were unrealized losses of $0.1 million on the Company’s investment in non-agency CMBS at March 31, 2016 compared to $2.7 million at December 31, 2015 . Unrealized losses decreased due to lower market rates on mainly seasoned fixed rate conduit deals which resulted in higher security prices at March 31, 2016 compared to December 31, 2015 . Internal and external metrics are considered when evaluating potential other-than temporary impairment. Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. The contractual cash flows for these investments are performing as expected. Sales of Available-for Sale Securities The following table provides information on sales of available-for-sale securities: Three months ended March 31, (In thousands) 2016 2015 Proceeds from sales $ 43,202 $ — Gross realized gains on sales $ 387 $ 43 Less: Gross realized losses on sales 67 — Gain on sale of investment securities, net $ 320 $ 43 Contractual Maturities The amortized cost and fair value of debt securities by contractual maturity are set forth below: At March 31, 2016 Available-for-Sale Held-to-Maturity (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 30,486 $ 29,741 $ 11,268 $ 11,395 Due after one year through five years 98,406 100,961 30,139 30,924 Due after five through ten years 467,105 462,725 43,999 45,599 Due after ten years 2,479,361 2,485,106 3,926,883 4,006,588 Total debt securities $ 3,075,358 $ 3,078,533 $ 4,012,289 $ 4,094,506 For the maturity schedule above, mortgage-backed securities and CLOs, 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 as borrowers have the right to prepay obligations with or without prepayment penalties. At March 31, 2016 , the Company had a carrying value of $1.0 billion 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 prepayments. Securities with a carrying value totaling $2.4 billion at March 31, 2016 and $2.6 billion at December 31, 2015 were pledged to secure public funds, trust deposits, repurchase agreements, and for other purposes, as required or permitted by law.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities A variable interest entity ("VIE") is an entity that has either a total equity investment that is insufficient to finance its activities without additional subordinated financial support or whose equity investors lack the ability to control the entity’s activities or lack the ability to receive expected benefits or absorb obligations in a manner that’s consistent with their investment in the entity. The Company evaluates each VIE to understand the purpose and design of the entity, and its involvement in the ongoing activities of the VIE. The Company will consolidate the VIE if it has: • the power to direct the activities of the VIE that most significantly affect the VIE's economic performance; and • an obligation to absorb losses of the VIE, or the right to receive benefits from the VIE, that could potentially be significant to the VIE. The Company has evaluated it's involvement with investments that are considered VIEs. The results of the evaluation are below: Consolidated Rabbi Trust. The Company has established a Rabbi Trust related to a deferred compensation plan offered to certain employees. Investments held in the Rabbi Trust primarily consist of mutual funds that invest in equity and fixed income securities. The Company is considered the primary beneficiary of the Rabbi Trust as it has the power to direct the underlying investments made by the trusts as well as make funding decisions related to the trusts and it has the obligation to absorb losses of the VIE that could potentially be significant to the VIE. The Company consolidates the invested assets of the trust along with the total deferred compensation obligations and includes them in accrued interest receivable and other assets and accrued expenses and other liabilities, respectively, in the accompanying Condensed 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 Condensed Consolidated Statements of Income. The cost and fair value associated with the assets and liabilities of this trust are not significant. Refer to Note 13: Fair Value Measurements for additional information. Non-Consolidated Securitized Investments. The Company, through normal investment activities, makes passive investments in securities issued by VIEs for which the Company is not the manager. These securities consist of CMOs, MBS, CMBS, CLOs and single issuer trust preferred securities. The Company has not provided financial or other support with respect to these investments other than its original investment. For these investments, the Company determined it is not the primary beneficiary due to the relative size of the Company’s investment in comparison to the principal amount of the structured securities issued by the VIEs, the level of credit subordination which reduces the Company’s obligation to absorb losses or right to receive benefits and the Company’s inability to direct the activities that most significantly impact the economic performance of the VIEs. The Company’s maximum exposure to loss on these investments is limited to the amount of the Company’s investment. Refer to Note 2: Investment Securities for additional information. Tax Credit - Finance Investments. The Company makes equity investments in entities that finance affordable housing and other community development projects and provide a return primarily through the realization of tax benefits. In most instances the investments require the funding of capital commitments in the future. While the Company's investment in an entity may exceed 50% of its outstanding equity interests, the entity is not consolidated as Webster is not involved in its management. For these investments, the Company determined it is not the primary beneficiary due to its inability to direct the activities that most significantly impact the economic performance of the VIEs. At March 31, 2016 and December 31, 2015 , the aggregate carrying value of the Company's tax credit-finance investments were $25.0 million and $25.9 million , respectively. At March 31, 2016 and December 31, 2015 , unfunded commitments, which are recognized as a component of accrued expenses and other liabilities, were $16.0 million and $16.5 million , respectively. Webster Statutory Trust. The Company owns all of the outstanding common stock of Webster Statutory Trust, which is a financial vehicle that has issued, and may issue in the future, 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 accrued interest receivable and other assets in the accompanying Condensed Consolidated Balance Sheets. Interest expense on the junior subordinated debentures is reported as interest expense on long-term debt in the accompanying Condensed Consolidated Statements of Income. Other Investments. The Company invests in various alternative investments in which it holds a variable interest. Alternative investments are non-public entities which cannot be redeemed since the Company’s investment is distributed as the underlying investments are liquidated. For these investments, the Company has determined it is not the primary beneficiary due to its inability to direct the activities that most significantly impacts the economic performance of the VIEs. At March 31, 2016 and December 31, 2015 , the aggregate carrying value of the Company's other investments in VIEs were $13.2 million and $12.1 million , respectively, and the total exposure of the Company's other investments, in VIEs, including unfunded commitments were $18.9 million and $19.0 million , respectively. For a further description of the Company's accounting policies regarding consolidation of VIEs, refer to Note 1 to the Consolidated Financial Statements for the year ended December 31, 2015 included in its 2015 Form 10-K.

Loans and Leases

Loans and Leases	3 Months Ended
	Mar. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	Loans and Leases The following table summarizes loans and leases: (In thousands) At March 31, 2016 At December 31, 2015 Residential $ 4,109,243 $ 4,061,001 Consumer 2,726,869 2,702,560 Commercial 4,378,760 4,315,999 Commercial Real Estate 4,046,911 3,991,649 Equipment Financing 596,572 600,526 Loans and leases (1) $ 15,858,355 $ 15,671,735 (1) Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015 , respectively. At March 31, 2016 , the Company had pledged $6.1 billion of eligible loan collateral to support borrowing capacity at the Federal Home Loan Bank of Boston ("FHLB") and the Federal Reserve Bank of Boston ("FRB"). Loans and Leases Portfolio Aging The following tables summarize the aging of loans and leases: At March 31, 2016 (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 Current Total Loans Residential $ 8,100 $ 2,375 $ 1,354 $ 53,805 $ 65,634 $ 4,043,609 $ 4,109,243 Consumer: Home equity 6,837 4,585 — 37,534 48,956 2,386,085 2,435,041 Other consumer 1,140 706 — 778 2,624 289,204 291,828 Commercial: Commercial non-mortgage 1,461 5,808 2,038 32,482 41,789 3,565,387 3,607,176 Asset-based — — — — — 771,584 771,584 Commercial real estate: Commercial real estate 19,843 889 — 11,948 32,680 3,774,029 3,806,709 Commercial construction — — — 3,460 3,460 236,742 240,202 Equipment financing 176 418 — 868 1,462 595,110 596,572 Total $ 37,557 $ 14,781 $ 3,392 $ 140,875 $ 196,605 $ 15,661,750 $ 15,858,355 At December 31, 2015 (In thousands) 30-59 Days 60-89 Days Past Due and Accruing 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans 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 Interest on non-accrual loans and leases that would have been recorded as additional interest income for the three months ended March 31, 2016 and 2015 , had the loans and leases been current in accordance with their original terms, totaled $3.0 million and $2.8 million , respectively. Allowance for Loan and Lease Losses The following tables summarize the allowance for loan and lease losses: At or for the three months ended March 31, 2016 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance, beginning of period $ 25,876 $ 42,052 $ 66,686 $ 34,889 $ 5,487 $ 174,990 Provision (benefit) charged to expense 2,327 2,791 10,536 (119 ) 65 15,600 Charge-offs (1,594 ) (4,421 ) (11,208 ) (1,526 ) (151 ) (18,900 ) Recoveries 721 1,214 457 74 45 2,511 Balance, end of period $ 27,330 $ 41,636 $ 66,471 $ 33,318 $ 5,446 $ 174,201 Individually evaluated for impairment $ 10,044 $ 3,037 $ 3,235 $ 2,022 $ 42 $ 18,380 Collectively evaluated for impairment $ 17,286 $ 38,599 $ 63,236 $ 31,296 $ 5,404 $ 155,821 Loan and lease balances: Individually evaluated for impairment $ 130,133 $ 48,096 $ 64,847 $ 35,619 $ 1,012 $ 279,707 Collectively evaluated for impairment 3,979,110 2,678,773 4,313,913 4,011,292 595,560 15,578,648 Loans and leases $ 4,109,243 $ 2,726,869 $ 4,378,760 $ 4,046,911 $ 596,572 $ 15,858,355 At or for the three months ended March 31, 2015 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance, beginning of period $ 25,452 $ 43,518 $ 52,114 $ 32,102 $ 6,078 $ 159,264 Provision (benefit) charged to expense 4,144 2,232 2,754 1,398 (778 ) 9,750 Charge-offs (1,955 ) (4,296 ) (255 ) (3,153 ) (15 ) (9,674 ) Recoveries 108 1,162 1,015 202 143 2,630 Balance, end of period $ 27,749 $ 42,616 $ 55,628 $ 30,549 $ 5,428 $ 161,970 Individually evaluated for impairment $ 14,350 $ 4,255 $ 4,939 $ 3,668 $ 28 $ 27,240 Collectively evaluated for impairment $ 13,399 $ 38,361 $ 50,689 $ 26,881 $ 5,400 $ 134,730 Loan and lease balances: Individually evaluated for impairment $ 140,362 $ 50,719 $ 49,311 $ 72,850 $ 631 $ 313,873 Collectively evaluated for impairment 3,453,910 2,518,718 3,850,499 3,590,221 543,005 13,956,353 Loans and leases $ 3,594,272 $ 2,569,437 $ 3,899,810 $ 3,663,071 $ 543,636 $ 14,270,226 Impaired Loans and Leases The following tables summarize impaired loans and leases: At March 31, 2016 (In thousands) Unpaid Principal Balance Total (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 143,159 $ 130,133 $ 22,191 $ 107,942 $ 10,044 Consumer 53,210 48,096 24,806 23,290 3,037 Commercial 83,347 64,847 38,119 26,728 3,235 Commercial real estate: Commercial real estate 31,686 29,657 14,687 14,970 2,019 Commercial construction 7,010 5,962 5,940 22 3 Equipment financing 1,307 1,012 — 1,012 42 Total $ 319,719 $ 279,707 $ 105,743 $ 173,964 $ 18,380 At December 31, 2015 (In thousands) Unpaid Principal Balance Total (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 148,144 $ 134,448 $ 23,024 $ 111,424 $ 10,364 Consumer 56,680 48,425 25,130 23,295 3,477 Commercial 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 The following table summarizes the average recorded investment and interest income recognized for impaired loans and leases: Three months ended March 31, 2016 2015 (In thousands) Average Recorded Investment Accrued Cash Basis Interest Income Average Recorded Investment Accrued Cash Basis Interest Income Residential $ 132,291 $ 1,115 $ 317 $ 141,625 $ 1,059 $ 256 Consumer 48,261 349 259 50,604 361 282 Commercial 60,714 472 — 43,037 427 — Commercial real estate: Commercial real estate 31,495 148 — 81,637 530 — Commercial construction 5,962 35 — 6,171 33 — Equipment financing 717 1 — 632 11 — Total $ 279,440 $ 2,120 $ 576 $ 323,706 $ 2,421 $ 538 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 summarizes commercial, commercial real estate and equipment financing loans and leases segregated by risk rating exposure: Commercial Commercial Real Estate Equipment Financing (In thousands) At March 31, At December 31, At March 31, At December 31, At March 31, At December 31, (1) - (6) Pass $ 4,060,128 $ 4,023,255 $ 3,897,741 $ 3,857,019 $ 574,782 $ 586,445 (7) Special Mention 101,340 70,904 36,700 55,030 8,234 1,628 (8) Substandard 216,098 220,389 112,165 79,289 13,556 12,453 (9) Doubtful 1,194 1,451 305 311 — — Total $ 4,378,760 $ 4,315,999 $ 4,046,911 $ 3,991,649 $ 596,572 $ 600,526 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 ("TDRs") The following table summarizes information for TDRs: (Dollars in thousands) At March 31, 2016 At December 31, 2015 Accrual status $ 172,036 $ 171,784 Non-accrual status 85,624 100,906 Total recorded investment of TDRs (1) $ 257,660 $ 272,690 Accruing TDRs performing under modified terms more than one year 55.2 % 55.0 % Specific reserves for TDRs included in the balance of allowance for loan and lease losses $ 16,123 $ 21,405 Additional funds committed to borrowers in TDR status 1,700 1,133 (1) Total recorded investment of TDRs excludes $1.0 million and $1.1 million of accrued interest receivable at March 31, 2016 and December 31, 2015 , respectively. In the three months ended March 31, 2016 and 2015 , Webster charged off $11.6 million and $3.9 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: Three months ended March 31, 2016 2015 Number of Post- (1) Number of Post- (1) (Dollars in thousands) Residential: Extended Maturity 5 $ 664 9 $ 1,345 Adjusted Interest Rate 1 236 — — Maturity/Rate Combined — — 10 1,668 Other (2) 7 1,415 3 536 Consumer: Extended Maturity 1 99 4 499 Adjusted Interest Rate — — — — Maturity/Rate Combined 4 300 8 444 Other (2) 7 338 21 1,332 Commercial: Extended Maturity 9 14,649 1 33 Adjusted Interest Rate — — — — Maturity/Rate Combined 1 4 2 132 Other (2) 4 310 — — Commercial real estate: Extended Maturity — — — — Maturity/Rate Combined 1 44 — — Other (2) 1 509 — — Equipment Financing Extended Maturity 1 4 — — Total TDRs 42 $ 18,572 58 $ 5,989 (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: Three months ended March 31, 2016 2015 (Dollars in thousands) Number of Loans and Leases Recorded Investment Number of Loans and Leases Recorded Investment Residential 3 $ 699 3 $ 642 Consumer 2 90 2 251 Commercial 9 12,587 2 6,317 Commercial real estate 1 405 1 10,930 Total 15 $ 13,781 8 $ 18,140 The recorded investment of TDRs in commercial, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: (In thousands) At March 31, 2016 At December 31, 2015 (1) - (6) Pass $ 12,197 $ 12,970 (7) Special Mention 2,959 2,999 (8) Substandard 64,008 72,132 (9) Doubtful 268 1,717 Total $ 79,432 $ 89,818

Transfers of Financial Assets

Transfers of Financial Assets	3 Months Ended
	Mar. 31, 2016
Transfers and Servicing [Abstract]
Transfers of Financial 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 securitizations. The gain or loss on residential mortgage loans sold and the fair value adjustment to loans held-for-sale are included as mortgage banking activities in the accompanying Condensed 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 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 also may 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 Condensed Consolidated Statements of Income. The following table provides a summary of activity in the reserve for loan repurchases: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 1,192 $ 1,059 Provision charged to expense 25 23 Repurchased loans and settlements charged off (98 ) — Ending balance $ 1,119 $ 1,082 The following table provides information for mortgage banking activities: Three months ended March 31, (In thousands) 2016 2015 Residential mortgage loans held for sale: Proceeds from sale $ 85,161 $ 76,895 Net gain on sale 1,605 1,561 Fair value option adjustment 1,024 — Loans sold with servicing rights retained 79,360 69,265 The Company has retained servicing rights on residential mortgage loans totaling $2.5 billion at both March 31, 2016 and December 31, 2015 . Loan servicing fees, net of mortgage servicing rights amortization, were $0.3 million and $0.4 million for the three months ended March 31, 2016 and 2015 , respectively, and are included as a component of loan related fees in the accompanying Condensed Consolidated Statements of Income. See Note 13: Fair Value Measurements for a further discussion on the fair value of loans held for sale and mortgage servicing assets. Additionally, loans not originated for sale were sold at cost, for cash proceeds of $8.2 million for certain commercial loans and $32.9 million for certain consumer loans for the three months ended March 31, 2016 and 2015 , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets There was no change in the carrying amounts for goodwill during the period. See the "Segment Results" section in Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations for goodwill allocated by reportable segment. The gross carrying amount and accumulated amortization of core deposit intangibles ("CDI") and customer relationships included in reportable segments are as follows: At March 31, 2016 At December 31, 2015 (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Community Banking CDI $ 49,420 $ (48,658 ) $ 762 $ 49,420 $ (48,277 ) $ 1,143 HSA Bank: CDI 22,000 (4,038 ) 17,962 22,000 (3,269 ) 18,731 Customer relationships 21,000 (1,952 ) 19,048 21,000 (1,548 ) 19,452 Total HSA Bank 43,000 (5,990 ) 37,010 43,000 (4,817 ) 38,183 Total other intangible assets $ 92,420 $ (54,648 ) $ 37,772 $ 92,420 $ (53,094 ) $ 39,326 As of March 31, 2016 , the remaining estimated aggregate future amortization expense for intangible assets is as follows: (In thousands) Remainder of 2016 $ 4,098 2017 4,062 2018 3,847 2019 3,847 2020 3,847 Thereafter 18,071

Deposits

Deposits	3 Months Ended
	Mar. 31, 2016
Banking and Thrift [Abstract]
Deposits	Deposits A summary of deposits by type follows: (In thousands) At March 31, At December 31, Non-interest-bearing: Demand $ 3,625,605 $ 3,713,063 Interest-bearing: Checking 2,421,692 2,369,971 Health savings accounts 4,084,190 3,802,313 Money market 2,319,588 1,933,460 Savings 4,244,383 4,047,817 Time deposits 2,029,065 2,086,154 Total interest-bearing 15,098,918 14,239,715 Total deposits $ 18,724,523 $ 17,952,778 Time deposits and interest-bearing checking, included in above balances, obtained through brokers $ 840,617 $ 910,304 Time deposits, included in above balance, that meet or exceed the Federal Deposit Insurance Corporation limit 505,665 542,206 Demand deposit overdrafts reclassified as loan balances 1,925 1,356 The scheduled maturities of time deposits are as follows: (In thousands) At March 31, 2016 Remainder of 2016 $ 760,077 2017 373,241 2018 260,971 2019 437,059 2020 171,163 Thereafter 26,554 Total time deposits $ 2,029,065

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table summarizes securities sold under agreements to repurchase and other borrowings: (In thousands) At March 31, At December 31, Securities sold under agreements to repurchase: Original maturity of one year or less $ 288,149 $ 334,400 Original maturity of greater than one year, non-callable 400,000 500,000 Total securities sold under agreements to repurchase 688,149 834,400 Fed funds purchased 222,000 317,000 Securities sold under agreements to repurchase and other borrowings $ 910,149 $ 1,151,400 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 agreement counterparties are limited to primary dealers in government securities and commercial/municipal customers through Webster’s Treasury Unit. 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 FHLB advances maturing: At March 31, 2016 At December 31, 2015 (Dollars in thousands) Total Outstanding Weighted- Average Contractual Coupon Rate Total Outstanding Weighted- Average Contractual Coupon Rate Within 1 year $ 1,700,000 0.53 % $ 2,025,934 0.55 % After 1 but within 2 years 50,500 1.10 500 5.66 After 2 but within 3 years 175,000 1.45 200,000 1.36 After 3 but within 4 years 153,026 1.68 103,026 1.54 After 4 but within 5 years 125,000 1.83 175,000 1.77 After 5 years 159,584 1.62 159,655 1.60 2,363,110 0.83 % 2,664,115 0.79 % Premiums on advances 21 24 Federal Home Loan Bank advances $ 2,363,131 $ 2,664,139 At March 31, 2016 , Webster Bank had pledged loans with an aggregate carrying value of $5.6 billion as collateral for borrowings, with a remaining borrowing capacity from the FHLB of approximately $1.4 billion . 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 . In addition, at March 31, 2016 and December 31, 2015 , Webster Bank had an unused line of credit of approximately $5.0 million . At March 31, 2016 and December 31, 2015 , Webster Bank was in compliance with FHLB collateral requirements. The following table summarizes long-term debt: (Dollars in thousands) At March 31, At December 31, 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 Discount on senior fixed-rate notes (934 ) (964 ) Debt issuance cost on senior fixed-rate notes (2) (1,063 ) (1,096 ) Long-term debt $ 225,323 $ 225,260 (1) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95% , was 3.59% at March 31, 2016 and 3.48% at December 31, 2015 . (2) In accordance with the adoption of ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs, debt issuance cost is accounted for as a reduction to Long-term debt. Previously debt issuance cost was included in "Accrued interest receivable and other assets" within the accompanying Condensed Consolidated Balance Sheets.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net of Tax	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Accumulated Other Comprehensive Loss, Net of Tax	Accumulated Other Comprehensive Loss, Net of Tax The following tables summarize the changes in accumulated other comprehensive (loss) income, net of tax by component: Three months ended March 31, 2016 (In thousands) Available For Sale and Transferred Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ (6,407 ) $ (22,980 ) $ (48,719 ) $ (78,106 ) Other comprehensive income (loss) before reclassifications 7,614 (2,452 ) 201 5,363 Amounts reclassified from accumulated other comprehensive income (loss) (109 ) 1,500 955 2,346 Net current-period other comprehensive income (loss), net of tax 7,505 (952 ) 1,156 7,709 Ending balance $ 1,098 $ (23,932 ) $ (47,563 ) $ (70,397 ) Three months ended March 31, 2015 (In thousands) Available For Sale and Transferred Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ 16,421 $ (25,530 ) $ (47,152 ) $ (56,261 ) Other comprehensive income (loss) before reclassifications 6,994 (3,096 ) 536 4,434 Amounts reclassified from accumulated other comprehensive income (loss) (27 ) 1,326 438 1,737 Net current-period other comprehensive income (loss), net of tax 6,967 (1,770 ) 974 6,171 Ending balance $ 23,388 $ (27,300 ) $ (46,178 ) $ (50,090 ) The following table provides information for the items reclassified from accumulated other comprehensive loss, net of tax: (In thousands) Three months ended March 31, Associated Line Item in the Condensed Consolidated Statements of Income Accumulated Other Comprehensive Loss Components 2016 2015 Available-for-sale and transferred securities: Unrealized gains (losses) on investment securities $ 320 $ 43 Gain on sale of investment securities, net Unrealized gains (losses) on investment securities (149 ) — Impairment loss recognized in earnings Tax expense (62 ) (16 ) Income tax expense Net of tax $ 109 $ 27 Derivative instruments: Cash flow hedges $ (2,365 ) $ (2,090 ) Total interest expense Tax benefit 865 764 Income tax expense Net of tax $ (1,500 ) $ (1,326 ) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,502 ) $ (672 ) Compensation and benefits Prior service costs (4 ) (18 ) Compensation and benefits Tax benefit 551 252 Income tax expense Net of tax $ (955 ) $ (438 )

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2016
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 Webster 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 require minimum amounts and ratios to ensure capital adequacy. 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 liabilities. Webster's common shareholders' equity, for purposes of CET1 capital, 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. The following table provides information on the capital ratios for Webster Financial Corporation and Webster Bank, N.A.: Capital Requirements Actual Minimum Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio At March 31, 2016 Webster Financial Corporation Common equity tier 1 risk-based capital $ 1,833,063 10.6 % $ 776,014 4.5 % $ 1,120,909 6.5 % Total risk-based capital 2,209,420 12.8 1,379,580 8.0 1,724,475 10.0 Tier 1 risk-based capital 1,955,773 11.3 1,034,685 6.0 1,379,580 8.0 Tier 1 leverage capital 1,955,773 8.1 969,807 4.0 1,212,259 5.0 Webster Bank, N.A. Common equity tier 1 risk-based capital $ 1,891,446 11.0 % $ 774,468 4.5 % $ 1,118,677 6.5 % Total risk-based capital 2,067,773 12.0 1,376,833 8.0 1,721,041 10.0 Tier 1 risk-based capital 1,891,446 11.0 1,032,625 6.0 1,376,833 8.0 Tier 1 leverage capital 1,891,446 7.8 968,838 4.0 1,211,047 5.0 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 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 $30 million during the three months ended March 31, 2016 as compared to $20 million during the three months ended March 31, 2015 . 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 $73.2 million and $109.4 million at March 31, 2016 and December 31, 2015 , respectively.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2016
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: Three months ended March 31, (In thousands, except per share data) 2016 2015 Earnings for basic and diluted earnings per common share: Net income $ 48,617 $ 49,722 Less: Preferred stock dividends 2,024 2,639 Net income available to common shareholders 46,593 47,083 Less: Earnings applicable to participating securities 107 146 Earnings applicable to common shareholders $ 46,486 $ 46,937 Shares: Weighted-average common shares outstanding - basic 91,328 90,251 Effect of dilutive securities: Stock options and restricted stock 452 540 Warrants 29 50 Weighted-average common shares outstanding - diluted 91,809 90,841 Earnings per common share: Basic $ 0.51 $ 0.52 Diluted 0.51 0.52 Potential common shares excluded from the effect of dilutive securities because they would have been anti-dilutive, are as follows: Three months ended March 31, (In thousands) 2016 2015 Stock options (shares with exercise price greater than market price) 213 344 Restricted stock (due to performance conditions on non-participating shares) 129 143 Basic weighted-average common shares outstanding includes the effect of 1.1 million common shares issued from treasury stock on June 1, 2015, representing the conversion of the Series A Preferred Stock. Prior to conversion, the Series A Preferred Stock was considered to be anti-dilutive. Refer to Note 15: Share-Based Plans for further information relating to potential common shares excluded from the effect of dilutive securities.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2016
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 which are 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 three months ended March 31, 2016 , 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 three months ended March 31, 2016 and 2015 , the Company recorded no ineffectiveness and immaterial amounts of ineffectiveness in earnings, respectively, 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 March 31, 2016 and December 31, 2015 . As a result, there was no impact to interest expense during the periods presented. 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. Fair Value of Derivative Instruments The following table presents the notional amounts and fair values of derivative positions: At March 31, 2016 At December 31, 2015 Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives (In thousands) Notional Fair Notional Fair Notional Fair Notional Fair Designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives $ 150,000 $ 1,136 $ 150,000 $ 3,868 $ 200,000 $ 2,507 $ 100,000 $ 1,359 Not designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives 503,342 265 2,083,293 81,486 989,695 2,255 1,543,479 40,302 Other 1,102 53 13,849 405 8,237 183 4,561 66 Positions not subject to a master netting agreement (2) Interest rate derivatives 2,130,842 103,133 455,818 126 2,050,460 58,304 482,738 571 RPA-In — — 97,026 343 — — 92,985 245 RPA-Out 55,635 262 — — 41,798 153 — — Other — — 60 9 — — 60 9 Total not designated as hedging instruments 2,690,921 103,713 2,650,046 82,369 3,090,190 60,895 2,123,823 41,193 Gross derivative instruments, before netting $ 2,840,921 104,849 $ 2,800,046 86,237 $ 3,290,190 63,402 $ 2,223,823 42,552 Less: Legally enforceable master netting agreements 1,454 1,454 4,945 4,945 Less: Cash collateral posted — 78,078 — 31,330 Total derivative instruments, after netting $ 103,395 $ 6,705 $ 58,457 $ 6,277 (1) The Company has elected to report derivative positions subject to a legally enforceable master netting agreement on a net basis, net of cash collateral. Refer to the Offsetting derivatives section of this footnote for additional information. (2) Derivative positions not subject to a legally enforceable master netting agreement are reported on a gross basis in the accompanying condensed consolidated balance sheets. Changes in Fair Value 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 Condensed Consolidated Statements of Income as follows: Three months ended March 31, (In thousands) 2016 2015 Interest rate derivatives $ 2,333 $ 2,637 RPA (86 ) (76 ) Other (513 ) (42 ) Total impact on non-interest income $ 1,734 $ 2,519 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 $2.0 million will be reclassified from AOCL as an increase to interest expense. Webster records gains and losses related to swap terminations to AOCL. These balances are subsequently amortized into interest expense over the respective terms of the hedged debt instruments. At March 31, 2016 , the remaining unamortized loss on the termination of cash flow hedges is $26.7 million . Over the next twelve months, the Company estimates that $7.8 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 9: Accumulated Other Comprehensive Loss, Net of Tax . Information about the valuation methods used to measure fair value is provided in Note 13: Fair Value Measurements . Offsetting Derivatives Webster has entered into transactions with counterparties that are subject to a legally enforceable master netting agreement. Derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral. Net positions are recorded in other assets for a net gain position and in other liabilities for a net loss position in the accompanying Condensed Consolidated Balance Sheets. The following table is presented on a gross basis, prior to the application of counterparty netting agreements. Derivative assets and liabilities are shown net of cash collateral: At March 31, 2016 At December 31, 2015 (In thousands) Gross Amount Amount Offset Net Amount (1) (2) Gross Amount Amount Offset Net Amount (1) (2) Derivative instrument assets Hedged Accounting Positions $ 1,136 $ (1,136 ) $ — $ 2,507 $ (2,507 ) $ — Non-Hedged Accounting Positions 318 (318 ) — 2,438 (2,438 ) — Total $ 1,454 $ (1,454 ) $ — $ 4,945 $ (4,945 ) $ — Derivative instrument liabilities Hedged Accounting Positions $ 3,868 $ (3,868 ) $ — $ 1,359 $ (1,359 ) $ — Non-Hedged Accounting Positions 81,891 (75,664 ) 6,227 40,369 (34,916 ) 5,453 Total $ 85,759 $ (79,532 ) $ 6,227 $ 41,728 $ (36,275 ) $ 5,453 (1) Net amount is net of $78.1 million and $31.3 million of cash collateral at March 31, 2016 and December 31, 2015 , respectively, as presented in the accompanying Condensed Consolidated Balance Sheets. (2) Net amount excludes $24.2 million and $20.2 million of initial margin requirements posted at the derivative clearing organization ("DCO") at March 31, 2016 and December 31, 2015 , respectively. Initial margin is recorded as a component of accrued interest receivable and other assets in the accompanying Condensed Consolidated Balance Sheets 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 $102.3 million in net margin collateral posted with financial counterparties at March 31, 2016 , comprised of $24.2 million in initial margin and $78.1 million in variation 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 $103.1 million at March 31, 2016 . 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 $21.0 million at March 31, 2016 . 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 March 31, 2016 , outstanding rate locks totaled approximately $83.6 million , and the outstanding commitments to sell residential mortgage loans totaled approximately $82.2 million . Forward sales, which include mandatory forward commitments of approximately $81.0 million at March 31, 2016 , 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 Condensed Consolidated Statements of Income. Refer to Note 13: Fair Value Measurements for information relating to the fair value of interest rate locked loan commitments and forward sales commitments.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
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 significant 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. Equity securities in financial services and U.S. Treasury Bills are classified within Level 1 of the fair value hierarchy. When quoted market prices are not available, the Company 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. Available-for-Sale investment securities which include agency CMO, agency MBS, agency CMBS, non-agency CMBS, CLO, single-issuer trust preferred securities, and corporate debt securities, are classified within Level 2 of the fair value hierarchy. 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 Condensed 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 Condensed Consolidated Statements of Income. The cost basis of the investments held in the Rabbi Trust is $3.6 million as of March 31, 2016 . 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 $5.8 million in unfunded commitments remaining for its alternative investments as of March 31, 2016 . See the Investment Securities Portfolio section of Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations for additional discussion of the Company's alternative investments. Originated 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. The Company generally records residential mortgage loans held for sale under the fair value option of ASC 820. 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. 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 of January 13, 2015. In periods subsequent to the initial valuation the fair value is adjusted for measurable attrition milestones. This valuation is based on contractual obligation and is reliant upon assumptions that require significant management judgment or estimation, and as such could be subject to calculation error or litigation. Therefore, the contingent consideration is classified within Level 3 of the fair value hierarchy. 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 March 31, 2016 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: U.S. Treasury Bills $ 475 $ — $ — $ 475 Agency CMO — 519,742 — 519,742 Agency MBS — 1,071,136 — 1,071,136 Agency CMBS — 365,017 — 365,017 CMBS — 526,825 — 526,825 CLO — 460,953 — 460,953 Single issuer trust preferred securities — 33,424 — 33,424 Corporate debt securities — 100,961 — 100,961 Equity securities 1,936 — — 1,936 Total available-for-sale investment securities 2,411 3,078,058 — 3,080,469 Gross derivative instruments, before netting (1) 53 104,796 — 104,849 Mortgage banking derivatives — 1,273 — 1,273 Investments held in Rabbi Trust 5,068 — — 5,068 Alternative investments — — 4,491 4,491 Originated loans held for sale (2) — 27,273 — 27,273 Contingent consideration — — 7,655 7,655 Total financial assets held at fair value $ 7,532 $ 3,211,400 $ 12,146 $ 3,231,078 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 405 $ 85,832 $ — $ 86,237 Mortgage banking derivatives — 655 — 655 Contingent liability — — 6,000 6,000 Total financial liabilities held at fair value $ 405 $ 86,487 $ 6,000 $ 92,892 At December 31, 2015 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: 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 CMBS — 579,266 — 579,266 CLO — 429,159 — 429,159 Single issuer trust preferred securities — 37,170 — 37,170 Corporate debt securities — 106,321 — 106,321 Equity securities 2,578 — — 2,578 Total available-for-sale investment securities 3,502 2,981,129 — 2,984,631 Gross derivative instruments, before netting (1) 183 63,219 — 63,402 Mortgage banking derivatives — 819 — 819 Investments held in Rabbi Trust 5,372 — — 5,372 Alternative investments — — 3,471 3,471 Originated loans held for sale — — — — Contingent Consideration — — 5,331 5,331 Total financial assets held at fair value $ 9,057 $ 3,045,167 $ 8,802 $ 3,063,026 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 66 $ 42,486 $ — $ 42,552 Mortgage banking derivatives — — — — Contingent liability — — 6,000 6,000 Total financial liabilities held at fair value $ 66 $ 42,486 $ 6,000 $ 48,552 (1) Asset and liability amounts are prior to the impact of netting derivative assets and derivative liabilities of $1,454 and $4,945 , and liability amounts are also prior to offsetting cash collateral paid to the same derivative counterparties of $78,078 and $31,330 , at March 31, 2016 and December 31, 2015 , respectively, when a legally enforceable master netting agreement exists. (2) Loans held for sale accounted for under the fair value option of ASC 820 at March 31, 2016 . The Company made this policy election on loans originated for sale. See Note 1: Summary of Significant Accounting Policies . The following table presents the changes in Level 3 assets and liabilities that are measured at fair value on a recurring basis: (In thousands) Alternative Investments Contingent Consideration Total Financial Assets Contingent Liability Balance at January1, 2016 $ 3,471 $ 5,331 $ 8,802 $ 6,000 Unrealized (loss) gain included in net income (1 ) 2,324 2,323 — Purchases/capital funding 1,021 — 1,021 — Balance at March 31, 2016 $ 4,491 $ 7,655 $ 12,146 $ 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. Transferred Loans Held For Sale. Certain loans are transferred to loans held for sale once a decision has been made to sell such loans. These loans 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. This activity is primarily commercial loans with observable inputs and are classified within Level 2. On the occasion should these loans include adjustments for changes in loan characteristics using unobservable inputs, the loans would be 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 $5.1 million at March 31, 2016 . 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 within 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. Changes in fair value are included as a component of other non-interest income in the accompanying Condensed Consolidated Statements of Income. 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 following table presents the changes in fair value for mortgage servicing assets: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 33,568 $ 28,690 Originations of servicing assets 1,913 1,463 Changes in fair value: Due to payoffs/paydowns (1,575 ) (736 ) Due to market changes 190 (1,516 ) Ending balance $ 34,096 $ 27,901 The table below presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a non-recurring basis as of March 31, 2016 : (Dollars in thousands) Asset Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Collateral dependent impaired loans and leases $ 10,202 Real Estate Appraisals Discount for appraisal type zero - 15% Discount for costs to sell 6% - 20% Other real estate owned $ 420 Real Estate Appraisals Discount for appraisal type 20% Discount for costs to sell 8% Mortgage servicing assets $ 34,096 Discounted cash flow Constant prepayment rate 7.9% - 35.2% Discount rates 1.3% - 2.8% 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 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. Held-to-Maturity investment securities, which include agency CMO, agency MBS, agency CMBS, non-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 March 31, 2016 At December 31, 2015 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial Assets: Level 2 Held-to-maturity investment securities $ 4,012,289 $ 4,094,506 $ 3,923,052 $ 3,961,534 Loans held for sale (1) 3,152 3,152 37,091 37,457 Level 3 Loans and leases, net 15,684,154 15,740,120 15,496,745 15,543,892 Mortgage servicing assets 21,026 34,096 20,698 33,568 Alternative investments 12,909 13,936 12,900 14,294 Financial Liabilities: Level 2 Deposit liabilities, other than time deposits $ 16,695,458 $ 16,695,458 $ 15,866,624 $ 15,866,624 Time deposits 2,029,065 2,051,672 2,086,154 2,095,357 Securities sold under agreements to repurchase and other borrowings 910,149 925,890 1,151,400 1,163,974 FHLB advances (2) 2,363,131 2,350,887 2,664,139 2,647,872 Long-term debt (2) 225,323 218,944 226,356 218,143 (1) Loans held for sale accounted for at the lower of cost or market includes commercial loans at March 31, 2016 and both commercial and residential loans at December 31, 2015 . (2) The following adjustments to the carrying amount are not included for determination of fair value, see Note 8: Borrowings : • FHLB advances - unamortized premiums on advances • Long-term debt - unamortized discount and debt issuance cost on senior fixed-rate notes 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	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans Defined benefit pension and other postretirement benefits The following table summarizes the components of net periodic benefit cost (benefit): Three months ended March 31, 2016 2015 (In thousands) Webster Pension Webster Other Postretirement Benefits Webster Pension Webster Other Postretirement Benefits Service cost $ 12 $ — $ — $ 10 $ — $ — Interest cost on benefit obligations 2,098 97 31 1,989 86 31 Expected return on plan assets (2,565 ) — — (2,963 ) — — Amortization of prior service cost — — 4 — — 18 Recognized net loss 1,690 130 9 1,427 80 12 Net periodic benefit cost $ 1,235 $ 227 $ 44 $ 463 $ 166 $ 61 The Webster Bank Pension Plan and the Supplemental Pension Plan were frozen effective December 31, 2007. No additional benefits have been accrued since that time. 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 actuarial firm.

Share-Based Plans

Share-Based Plans	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Plans	Share-Based Plans Stock compensation 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 following table provides a summary of stock compensation expense recognized in the accompanying Condensed Consolidated Statements of Income: Three months ended March 31, (In thousands) 2016 2015 Stock options $ 43 $ 164 Restricted stock 2,740 2,118 Total stock compensation expense $ 2,783 $ 2,282 At March 31, 2016 there was $20.1 million of unrecognized stock compensation expense for restricted stock expected to be recognized over a weighted-average period of 2.2 years . The following table provides a summary of the activity under the Plans for the three months ended March 31, 2016 : Restricted Stock Awards Outstanding 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 Outstanding, at January1, 2016 236,146 $ 32.58 2,088 $ 34.45 115,721 $ 34.14 1,527,074 $ 23.92 Granted 194,754 33.02 12,946 32.89 150,392 32.75 — — Exercised options — — — — — — 22,499 13.36 Vested restricted stock awards (1) 54,413 30.65 3,166 33.92 28,359 33.77 — — Forfeited 1,204 30.04 — — — — — — Outstanding and exercisable, at March 31, 2016 375,283 $ 33.09 11,868 $ 32.89 237,754 $ 33.30 1,504,575 $ 24.08 (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 a 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. The awards vest with a share quantity dependent on that performance, in a range from zero to 150% . Performance-based shares granted in 2016 vest, based 50% 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 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. Stock options. Stock option awards have an exercise price equal to the market price of Webster's stock on the date of grant. Each option grants the holder the right to acquire a share of Webster common stock over a contractual life of up to 10 years. All awarded options have vested. There were 1,362,567 non-qualified stock options and 142,008 incentive stock options outstanding at March 31, 2016 .

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting Webster’s operations are organized 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. These segments reflect how executive management responsibilities are assigned by each of the core businesses, the products and services provided, and the type of customer served and reflect how discrete financial information is currently evaluated by the chief operating decision maker. 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. 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: Three months ended March 31, 2016 (In thousands) Commercial Banking Community Banking HSA Bank Private Banking Corporate and Reconciling Consolidated Total Net interest income (loss) $ 65,422 $ 90,056 $ 19,919 $ 2,873 $ (2,118 ) $ 176,152 Provision (benefit) for loan and lease losses 10,248 6,244 — 29 (921 ) 15,600 Net interest income (loss) after provision for loan and lease losses 55,174 83,812 19,919 2,844 (1,197 ) 160,552 Non-interest income 8,783 26,640 21,605 2,365 4,631 64,024 Non-interest expense 28,689 90,876 23,554 5,371 3,252 151,742 Income (loss) before income tax expense 35,268 19,576 17,970 (162 ) 182 72,834 Income tax expense (benefit) 11,727 6,509 5,975 (54 ) 60 24,217 Net income (loss) $ 23,541 $ 13,067 $ 11,995 $ (108 ) $ 122 $ 48,617 Three months ended March 31, 2015 (In thousands) Commercial Banking Community Banking HSA Bank Private Banking Corporate and Reconciling Consolidated Total Net interest income (loss) $ 61,578 $ 84,239 $ 16,465 $ 2,395 $ (4,913 ) $ 159,764 Provision (benefit) for loan and lease losses 3,374 6,421 — (57 ) 12 9,750 Net interest income after provision for loan and lease losses 58,204 77,818 16,465 2,452 (4,925 ) 150,014 Non-interest income 9,525 25,540 15,151 2,326 5,348 57,890 Non-interest expense 26,469 81,690 18,958 4,879 2,094 134,090 Income (loss) before income tax expense 41,260 21,668 12,658 (101 ) (1,671 ) 73,814 Income tax expense (benefit) 13,467 7,073 4,131 (33 ) (546 ) 24,092 Net income (loss) $ 27,793 $ 14,595 $ 8,527 $ (68 ) $ (1,125 ) $ 49,722 Total Assets (In thousands) Commercial Banking Community HSA Bank Private Corporate and Reconciling Consolidated Total At March 31, 2016 $ 7,641,618 $ 8,471,644 $ 102,106 $ 504,911 $ 8,215,230 $ 24,935,509 At December 31, 2015 7,505,513 8,441,950 95,815 493,571 8,106,038 24,642,887

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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: (In thousands) At March 31, 2016 At December 31, 2015 Commitments to extend credit $ 5,050,534 $ 4,851,994 Standby letter of credit 124,150 133,294 Commercial letter of credit 47,762 45,742 Total credit-related financial instruments with off-balance sheet risk $ 5,222,446 $ 5,031,030 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 Condensed Consolidated Balance Sheets. The following table provides a summary of activity in the reserve for unfunded credit commitments: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 2,119 $ 5,151 Provision (benefit) 7 (2,831 ) Ending balance $ 2,126 $ 2,320 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 an accrual for litigation and claims when a loss contingency is considered probable and the related amount is reasonably estimable. This accrual is 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 accrual, Webster believes that at March 31, 2016 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.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accounting and reporting policies of the Company that materially affect its financial statements conform with U.S. Generally Accepted Accounting Principles ("GAAP"). The accompanying unaudited Condensed Consolidated Financial Statements of the Company have been prepared in conformity with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and notes required by GAAP for complete financial statements and should be read in conjunction with the Company's Consolidated Financial Statements, and notes thereto, for the year ended December 31, 2015 , included in the Company's Annual Report on Form 10-K filed with the SEC on February 29, 2016. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as income and expense during the period. Actual results could differ from those estimates. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full year or any future period.
Reclassification	Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on total assets, total liabilities, net cash provided by operating activities, net cash used for investing activities, and net cash provided by financing activities.
Loans Held For Sale	Loans Held For Sale. Prior to and for the period ended December 31, 2015, residential mortgage loans that were classified as held for sale were accounted for at the lower of cost or fair value method of accounting and were valued on an individual asset basis. Effective January 1, 2016, on a loan by loan election, residential mortgage loans that are classified as held for sale are accounted for under either the fair value option method of accounting or the lower of cost or fair value method of accounting with the election being made at the time the asset is first recognized. The Company has elected the fair value option to mitigate accounting mismatches between held for sale derivative commitments and loan valuations. Loans not originated for sale but subsequently transferred to held for sale continue to be valued at the lower of cost or fair value method of accounting and are valued on an individual asset basis.
Financial Accounting Standards Board (FASB) Standards Adopted during 2016 and FASB Standards Issued but not yet Adopted	Financial Accounting Standards Board ("FASB") Standards Adopted during 2016 Effective January 1, 2016, the following new accounting guidance was adopted by the Company: • ASU No. 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis; • ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs; • ASU No. 2015-07, Fair Value Measurement (Topic 820) - Disclosures for investments in Certain Entities That Calculate New Asset Value per Share (or its Equivalent) (a consensus of the FASB Emerging Issues Task Force); and • ASU No. 2015-16, Business Combinations (Topic 805) - Simplifying the Accounting for Measurement - Period Adjustments. As a result of ASU No. 2015-02, the Company did not identify any additional investments requiring consolidation, however, has included additional disclosures of variable interest entities in Note 3: Variable Interest Entities . The adoption of these accounting standards did not have a material impact on the Company's financial statements. FASB Standards Issued but not yet Adopted 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. 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share Based Payment Accounting. The Update impacts the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. In addition, the amendments in this Update eliminates the guidance in Topic 718 that was indefinitely deferred shortly after the issuance of FASB Statement No. 123 (revised 2004), Share-Based Payment. The Company intends to adopt the Update for the first quarter of 2017 and is in the process of assessing the impact on its financial statements. ASU No. 2016-06, Derivatives and Hedging (Topic 815) - Contingent Put and Call Options in Debt Instruments. The Update clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The Update requires the assessment of embedded call (put) options solely in accordance with the four-step decision sequence. The Company intends to adopt the Update for the first quarter of 2017. Adoption is not anticipated to have a material impact on the Company's financial statements. ASU No. 2016-02, Leases (Topic 842). The Update introduces a lessee model that brings most leases on the balance sheet. The Update also aligns certain of the underlying principles of the new lessor model with those in ASC 606, the FASB’s new revenue recognition standard (e.g., evaluating how collectability should be considered and determining when profit can be recognized). Furthermore, the Update addresses other concerns including the elimination of the required use of bright-line tests for determining lease classification. Lessors are required to provide additional transparency into the exposure to the changes in value of their residual assets and how they manage that exposure. The Company intends to adopt the Update for the first quarter of 2019 and is in the process of assessing the impact on its financial statements. 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. 2014-09, Revenue from Contracts with Customers (Topic 606) ASU No. 2015-14, 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 International Financial Reporting Standards. 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.

Summary of Significant Accoun27

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Error Corrections and Prior Period Adjustments	Correction of Immaterial Error Related to Prior Periods During the three months ended March 31, 2016 , the Company identified an error relating to the accounting for cash collateral associated with derivative instruments. Based on requirements of Financial Accounting Standards Board Accounting Standards Codification ("ASC") 305, Cash and Cash Equivalents , the Company determined the cash collateral was incorrectly classified as cash and due from banks. In accordance with the requirements of FASB ASC 815, Derivatives and Hedging, the variation margin of cash collateral, pertaining to derivatives reported on a net basis, subject to a legally enforceable master netting arrangement, with the same counterparty, are offset against the net derivative position on the Company's Condensed Consolidated Balance Sheets. The cash collateral, relating to the initial margin, is included within accrued interest receivable and other assets on the Company's Condensed Consolidated Balance Sheets. The Company reviewed the impact of this error on the prior periods in accordance with Securities and Exchange Commission Staff Accounting Bulletin No. 99, Materiality, and determined that the error was immaterial to previously reported amounts contained in the Company's annual and quarterly reports. Accordingly, within this Form 10-Q the Company revised its Condensed Consolidated Balance Sheet for December 31, 2015 and its Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2015 . The effects of recording this immaterial correction are as follows: December 31, 2015 (In thousands) As Reported As Revised CONDENSED CONSOLIDATED BALANCE SHEETS Cash and due from banks $ 251,258 $ 199,693 Accrued interest receivable and other assets (1) 328,993 346,721 Accrued expenses and other liabilities 267,576 233,739 Three months ended March 31, 2015 (In thousands) As Reported As Revised CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net increase in accrued interest receivable and other assets $ (33,912 ) $ (38,117 ) Net increase (decrease) in accrued expenses and other liabilities 14,552 (4,088 ) (1) The amount recored as revised excludes the impact of a $1.1 million reclassification of debt issuance cost from accrued interest receivable and other assets into long-term debt. The reclassification was made in accordance with the Company's adoption of ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs, and is not considered part of the error correction.
Schedule of 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. 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share Based Payment Accounting. The Update impacts the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. In addition, the amendments in this Update eliminates the guidance in Topic 718 that was indefinitely deferred shortly after the issuance of FASB Statement No. 123 (revised 2004), Share-Based Payment. The Company intends to adopt the Update for the first quarter of 2017 and is in the process of assessing the impact on its financial statements. ASU No. 2016-06, Derivatives and Hedging (Topic 815) - Contingent Put and Call Options in Debt Instruments. The Update clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The Update requires the assessment of embedded call (put) options solely in accordance with the four-step decision sequence. The Company intends to adopt the Update for the first quarter of 2017. Adoption is not anticipated to have a material impact on the Company's financial statements. ASU No. 2016-02, Leases (Topic 842). The Update introduces a lessee model that brings most leases on the balance sheet. The Update also aligns certain of the underlying principles of the new lessor model with those in ASC 606, the FASB’s new revenue recognition standard (e.g., evaluating how collectability should be considered and determining when profit can be recognized). Furthermore, the Update addresses other concerns including the elimination of the required use of bright-line tests for determining lease classification. Lessors are required to provide additional transparency into the exposure to the changes in value of their residual assets and how they manage that exposure. The Company intends to adopt the Update for the first quarter of 2019 and is in the process of assessing the impact on its financial statements. 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. 2014-09, Revenue from Contracts with Customers (Topic 606) ASU No. 2015-14, 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 International Financial Reporting Standards. 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.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 At December 31, 2015 (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 $ 475 $ — $ — $ 475 $ 924 $ — $ — $ 924 Agency collateralized mortgage obligations (“agency CMO”) 511,772 8,918 (948 ) 519,742 546,168 5,532 (2,946 ) 548,754 Agency mortgage-backed securities (“agency MBS”) 1,069,685 8,331 (6,880 ) 1,071,136 1,075,941 6,459 (17,291 ) 1,065,109 Agency commercial mortgage-backed securities (“agency CMBS”) 360,217 4,880 (80 ) 365,017 215,670 639 (959 ) 215,350 Non-agency commercial mortgage-backed securities agency (“non-agency CMBS”) 528,189 5,518 (6,882 ) 526,825 574,686 7,485 (2,905 ) 579,266 Collateralized loan obligations ("CLO") 464,394 525 (3,966 ) 460,953 431,837 592 (3,270 ) 429,159 Single issuer trust preferred securities 42,220 — (8,796 ) 33,424 42,168 — (4,998 ) 37,170 Corporate debt securities 98,406 2,555 — 100,961 104,031 2,290 — 106,321 Equities - financial services 3,499 — (1,563 ) 1,936 3,499 — (921 ) 2,578 Securities available-for-sale $ 3,078,857 $ 30,727 $ (29,115 ) $ 3,080,469 $ 2,994,924 $ 22,997 $ (33,290 ) $ 2,984,631 Held-to-maturity: Agency CMO $ 384,905 $ 6,153 $ (425 ) $ 390,633 $ 407,494 $ 3,717 $ (2,058 ) $ 409,153 Agency MBS 2,086,393 44,832 (6,978 ) 2,124,247 2,030,176 38,813 (19,908 ) 2,049,081 Agency CMBS 678,969 15,549 — 694,518 686,086 4,253 (325 ) 690,014 Municipal bonds and notes 486,777 13,365 (142 ) 500,000 435,905 12,019 (417 ) 447,507 Non-agency CMBS 372,451 9,915 (78 ) 382,288 360,018 5,046 (2,704 ) 362,360 Private Label MBS 2,794 26 — 2,820 3,373 46 — 3,419 Securities held-to-maturity $ 4,012,289 $ 89,840 $ (7,623 ) $ 4,094,506 $ 3,923,052 $ 63,894 $ (25,412 ) $ 3,961,534
Summary of Changes in OTTI	The following table presents the changes in OTTI: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 3,288 $ 3,696 Reduction for securities sold or called — (99 ) Additions for OTTI not previously recognized 149 — Ending balance $ 3,437 $ 3,597
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 March 31, 2016 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 $ 35,571 $ (166 ) $ 54,475 $ (782 ) 4 $ 90,046 $ (948 ) Agency MBS 129,284 (407 ) 502,745 (6,473 ) 72 632,029 (6,880 ) Agency CMBS 40,249 (80 ) — — 2 40,249 (80 ) Non-agency CMBS 258,733 (6,637 ) 24,782 (245 ) 28 283,515 (6,882 ) CLO 250,385 (3,363 ) 15,670 (603 ) 15 266,055 (3,966 ) Single issuer trust preferred securities 3,654 (568 ) 29,770 (8,228 ) 8 33,424 (8,796 ) Equities - financial services 1,936 (1,563 ) — — 1 1,936 (1,563 ) Total available-for-sale in an unrealized loss position $ 719,812 $ (12,784 ) $ 627,442 $ (16,331 ) 130 $ 1,347,254 $ (29,115 ) Held-to-maturity: Agency CMO $ — $ — $ 50,476 $ (425 ) 3 $ 50,476 $ (425 ) Agency MBS 155,405 (568 ) 625,844 (6,410 ) 58 781,249 (6,978 ) Agency CMBS — — — — — — — Municipal bonds and notes 43,220 (118 ) 4,377 (24 ) 32 47,597 (142 ) Non-agency CMBS 24,532 (72 ) 5,265 (6 ) 3 29,797 (78 ) Total held-to-maturity in an unrealized loss position $ 223,157 $ (758 ) $ 685,962 $ (6,865 ) 96 $ 909,119 $ (7,623 ) 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 services 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 )
Summary of Sale Proceeds of Available for Sale Securities	The following table provides information on sales of available-for-sale securities: Three months ended March 31, (In thousands) 2016 2015 Proceeds from sales $ 43,202 $ — Gross realized gains on sales $ 387 $ 43 Less: Gross realized losses on sales 67 — Gain on sale of investment securities, net $ 320 $ 43
Summary of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities by contractual maturity are set forth below: At March 31, 2016 Available-for-Sale Held-to-Maturity (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 30,486 $ 29,741 $ 11,268 $ 11,395 Due after one year through five years 98,406 100,961 30,139 30,924 Due after five through ten years 467,105 462,725 43,999 45,599 Due after ten years 2,479,361 2,485,106 3,926,883 4,006,588 Total debt securities $ 3,075,358 $ 3,078,533 $ 4,012,289 $ 4,094,506

Loans and Leases (Tables)

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table summarizes loans and leases: (In thousands) At March 31, 2016 At December 31, 2015 Residential $ 4,109,243 $ 4,061,001 Consumer 2,726,869 2,702,560 Commercial 4,378,760 4,315,999 Commercial Real Estate 4,046,911 3,991,649 Equipment Financing 596,572 600,526 Loans and leases (1) $ 15,858,355 $ 15,671,735 (1) Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015 , respectively.
Past Due Financing Receivables	The following tables summarize the aging of loans and leases: At March 31, 2016 (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 Current Total Loans Residential $ 8,100 $ 2,375 $ 1,354 $ 53,805 $ 65,634 $ 4,043,609 $ 4,109,243 Consumer: Home equity 6,837 4,585 — 37,534 48,956 2,386,085 2,435,041 Other consumer 1,140 706 — 778 2,624 289,204 291,828 Commercial: Commercial non-mortgage 1,461 5,808 2,038 32,482 41,789 3,565,387 3,607,176 Asset-based — — — — — 771,584 771,584 Commercial real estate: Commercial real estate 19,843 889 — 11,948 32,680 3,774,029 3,806,709 Commercial construction — — — 3,460 3,460 236,742 240,202 Equipment financing 176 418 — 868 1,462 595,110 596,572 Total $ 37,557 $ 14,781 $ 3,392 $ 140,875 $ 196,605 $ 15,661,750 $ 15,858,355 At December 31, 2015 (In thousands) 30-59 Days 60-89 Days Past Due and Accruing 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans 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
Activity In Allowance For Losses	The following tables summarize the allowance for loan and lease losses: At or for the three months ended March 31, 2016 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance, beginning of period $ 25,876 $ 42,052 $ 66,686 $ 34,889 $ 5,487 $ 174,990 Provision (benefit) charged to expense 2,327 2,791 10,536 (119 ) 65 15,600 Charge-offs (1,594 ) (4,421 ) (11,208 ) (1,526 ) (151 ) (18,900 ) Recoveries 721 1,214 457 74 45 2,511 Balance, end of period $ 27,330 $ 41,636 $ 66,471 $ 33,318 $ 5,446 $ 174,201 Individually evaluated for impairment $ 10,044 $ 3,037 $ 3,235 $ 2,022 $ 42 $ 18,380 Collectively evaluated for impairment $ 17,286 $ 38,599 $ 63,236 $ 31,296 $ 5,404 $ 155,821 Loan and lease balances: Individually evaluated for impairment $ 130,133 $ 48,096 $ 64,847 $ 35,619 $ 1,012 $ 279,707 Collectively evaluated for impairment 3,979,110 2,678,773 4,313,913 4,011,292 595,560 15,578,648 Loans and leases $ 4,109,243 $ 2,726,869 $ 4,378,760 $ 4,046,911 $ 596,572 $ 15,858,355 At or for the three months ended March 31, 2015 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total Allowance for loan and lease losses: Balance, beginning of period $ 25,452 $ 43,518 $ 52,114 $ 32,102 $ 6,078 $ 159,264 Provision (benefit) charged to expense 4,144 2,232 2,754 1,398 (778 ) 9,750 Charge-offs (1,955 ) (4,296 ) (255 ) (3,153 ) (15 ) (9,674 ) Recoveries 108 1,162 1,015 202 143 2,630 Balance, end of period $ 27,749 $ 42,616 $ 55,628 $ 30,549 $ 5,428 $ 161,970 Individually evaluated for impairment $ 14,350 $ 4,255 $ 4,939 $ 3,668 $ 28 $ 27,240 Collectively evaluated for impairment $ 13,399 $ 38,361 $ 50,689 $ 26,881 $ 5,400 $ 134,730 Loan and lease balances: Individually evaluated for impairment $ 140,362 $ 50,719 $ 49,311 $ 72,850 $ 631 $ 313,873 Collectively evaluated for impairment 3,453,910 2,518,718 3,850,499 3,590,221 543,005 13,956,353 Loans and leases $ 3,594,272 $ 2,569,437 $ 3,899,810 $ 3,663,071 $ 543,636 $ 14,270,226
Impaired Loans	The following tables summarize impaired loans and leases: At March 31, 2016 (In thousands) Unpaid Principal Balance Total (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 143,159 $ 130,133 $ 22,191 $ 107,942 $ 10,044 Consumer 53,210 48,096 24,806 23,290 3,037 Commercial 83,347 64,847 38,119 26,728 3,235 Commercial real estate: Commercial real estate 31,686 29,657 14,687 14,970 2,019 Commercial construction 7,010 5,962 5,940 22 3 Equipment financing 1,307 1,012 — 1,012 42 Total $ 319,719 $ 279,707 $ 105,743 $ 173,964 $ 18,380 At December 31, 2015 (In thousands) Unpaid Principal Balance Total (1) Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 148,144 $ 134,448 $ 23,024 $ 111,424 $ 10,364 Consumer 56,680 48,425 25,130 23,295 3,477 Commercial 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 The following table summarizes the average recorded investment and interest income recognized for impaired loans and leases: Three months ended March 31, 2016 2015 (In thousands) Average Recorded Investment Accrued Cash Basis Interest Income Average Recorded Investment Accrued Cash Basis Interest Income Residential $ 132,291 $ 1,115 $ 317 $ 141,625 $ 1,059 $ 256 Consumer 48,261 349 259 50,604 361 282 Commercial 60,714 472 — 43,037 427 — Commercial real estate: Commercial real estate 31,495 148 — 81,637 530 — Commercial construction 5,962 35 — 6,171 33 — Equipment financing 717 1 — 632 11 — Total $ 279,440 $ 2,120 $ 576 $ 323,706 $ 2,421 $ 538
Financing Receivable Credit Quality Indicators	The following table summarizes commercial, commercial real estate and equipment financing loans and leases segregated by risk rating exposure: Commercial Commercial Real Estate Equipment Financing (In thousands) At March 31, At December 31, At March 31, At December 31, At March 31, At December 31, (1) - (6) Pass $ 4,060,128 $ 4,023,255 $ 3,897,741 $ 3,857,019 $ 574,782 $ 586,445 (7) Special Mention 101,340 70,904 36,700 55,030 8,234 1,628 (8) Substandard 216,098 220,389 112,165 79,289 13,556 12,453 (9) Doubtful 1,194 1,451 305 311 — — Total $ 4,378,760 $ 4,315,999 $ 4,046,911 $ 3,991,649 $ 596,572 $ 600,526
Troubled Debt Restructurings on Financing Receivables	Troubled Debt Restructurings ("TDRs") The following table summarizes information for TDRs: (Dollars in thousands) At March 31, 2016 At December 31, 2015 Accrual status $ 172,036 $ 171,784 Non-accrual status 85,624 100,906 Total recorded investment of TDRs (1) $ 257,660 $ 272,690 Accruing TDRs performing under modified terms more than one year 55.2 % 55.0 % Specific reserves for TDRs included in the balance of allowance for loan and lease losses $ 16,123 $ 21,405 Additional funds committed to borrowers in TDR status 1,700 1,133 (1) Total recorded investment of TDRs excludes $1.0 million and $1.1 million of accrued interest receivable at March 31, 2016 and December 31, 2015 , respectively. In the three months ended March 31, 2016 and 2015 , Webster charged off $11.6 million and $3.9 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: Three months ended March 31, 2016 2015 Number of Post- (1) Number of Post- (1) (Dollars in thousands) Residential: Extended Maturity 5 $ 664 9 $ 1,345 Adjusted Interest Rate 1 236 — — Maturity/Rate Combined — — 10 1,668 Other (2) 7 1,415 3 536 Consumer: Extended Maturity 1 99 4 499 Adjusted Interest Rate — — — — Maturity/Rate Combined 4 300 8 444 Other (2) 7 338 21 1,332 Commercial: Extended Maturity 9 14,649 1 33 Adjusted Interest Rate — — — — Maturity/Rate Combined 1 4 2 132 Other (2) 4 310 — — Commercial real estate: Extended Maturity — — — — Maturity/Rate Combined 1 44 — — Other (2) 1 509 — — Equipment Financing Extended Maturity 1 4 — — Total TDRs 42 $ 18,572 58 $ 5,989 (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: Three months ended March 31, 2016 2015 (Dollars in thousands) Number of Loans and Leases Recorded Investment Number of Loans and Leases Recorded Investment Residential 3 $ 699 3 $ 642 Consumer 2 90 2 251 Commercial 9 12,587 2 6,317 Commercial real estate 1 405 1 10,930 Total 15 $ 13,781 8 $ 18,140 The recorded investment of TDRs in commercial, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: (In thousands) At March 31, 2016 At December 31, 2015 (1) - (6) Pass $ 12,197 $ 12,970 (7) Special Mention 2,959 2,999 (8) Substandard 64,008 72,132 (9) Doubtful 268 1,717 Total $ 79,432 $ 89,818

Transfers of Financial Assets (

Transfers of Financial Assets (Tables)	3 Months Ended
	Mar. 31, 2016
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: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 1,192 $ 1,059 Provision charged to expense 25 23 Repurchased loans and settlements charged off (98 ) — Ending balance $ 1,119 $ 1,082
Schedule of Loan Sale Activity	The following table provides information for mortgage banking activities: Three months ended March 31, (In thousands) 2016 2015 Residential mortgage loans held for sale: Proceeds from sale $ 85,161 $ 76,895 Net gain on sale 1,605 1,561 Fair value option adjustment 1,024 — Loans sold with servicing rights retained 79,360 69,265

Goodwill and Other Intangible31

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The gross carrying amount and accumulated amortization of core deposit intangibles ("CDI") and customer relationships included in reportable segments are as follows: At March 31, 2016 At December 31, 2015 (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Community Banking CDI $ 49,420 $ (48,658 ) $ 762 $ 49,420 $ (48,277 ) $ 1,143 HSA Bank: CDI 22,000 (4,038 ) 17,962 22,000 (3,269 ) 18,731 Customer relationships 21,000 (1,952 ) 19,048 21,000 (1,548 ) 19,452 Total HSA Bank 43,000 (5,990 ) 37,010 43,000 (4,817 ) 38,183 Total other intangible assets $ 92,420 $ (54,648 ) $ 37,772 $ 92,420 $ (53,094 ) $ 39,326
Schedule Of Expected Amortization Expense, Next Four Years	As of March 31, 2016 , the remaining estimated aggregate future amortization expense for intangible assets is as follows: (In thousands) Remainder of 2016 $ 4,098 2017 4,062 2018 3,847 2019 3,847 2020 3,847 Thereafter 18,071

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2016
Banking and Thrift [Abstract]
Schedule of Deposits	A summary of deposits by type follows: (In thousands) At March 31, At December 31, Non-interest-bearing: Demand $ 3,625,605 $ 3,713,063 Interest-bearing: Checking 2,421,692 2,369,971 Health savings accounts 4,084,190 3,802,313 Money market 2,319,588 1,933,460 Savings 4,244,383 4,047,817 Time deposits 2,029,065 2,086,154 Total interest-bearing 15,098,918 14,239,715 Total deposits $ 18,724,523 $ 17,952,778 Time deposits and interest-bearing checking, included in above balances, obtained through brokers $ 840,617 $ 910,304 Time deposits, included in above balance, that meet or exceed the Federal Deposit Insurance Corporation limit 505,665 542,206 Demand deposit overdrafts reclassified as loan balances 1,925 1,356
Scheduled Maturities of Time Deposits	The scheduled maturities of time deposits are as follows: (In thousands) At March 31, 2016 Remainder of 2016 $ 760,077 2017 373,241 2018 260,971 2019 437,059 2020 171,163 Thereafter 26,554 Total time deposits $ 2,029,065

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements [Table Text Block]	The following table summarizes securities sold under agreements to repurchase and other borrowings: (In thousands) At March 31, At December 31, Securities sold under agreements to repurchase: Original maturity of one year or less $ 288,149 $ 334,400 Original maturity of greater than one year, non-callable 400,000 500,000 Total securities sold under agreements to repurchase 688,149 834,400 Fed funds purchased 222,000 317,000 Securities sold under agreements to repurchase and other borrowings $ 910,149 $ 1,151,400
Federal Home Loan Bank, Advances [Table Text Block]	The following table provides information for FHLB advances maturing: At March 31, 2016 At December 31, 2015 (Dollars in thousands) Total Outstanding Weighted- Average Contractual Coupon Rate Total Outstanding Weighted- Average Contractual Coupon Rate Within 1 year $ 1,700,000 0.53 % $ 2,025,934 0.55 % After 1 but within 2 years 50,500 1.10 500 5.66 After 2 but within 3 years 175,000 1.45 200,000 1.36 After 3 but within 4 years 153,026 1.68 103,026 1.54 After 4 but within 5 years 125,000 1.83 175,000 1.77 After 5 years 159,584 1.62 159,655 1.60 2,363,110 0.83 % 2,664,115 0.79 % Premiums on advances 21 24 Federal Home Loan Bank advances $ 2,363,131 $ 2,664,139
Schedule of Long-term Debt Instruments [Table Text Block]	The following table summarizes long-term debt: (Dollars in thousands) At March 31, At December 31, 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 Discount on senior fixed-rate notes (934 ) (964 ) Debt issuance cost on senior fixed-rate notes (2) (1,063 ) (1,096 ) Long-term debt $ 225,323 $ 225,260 (1) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95% , was 3.59% at March 31, 2016 and 3.48% at December 31, 2015 . (2) In accordance with the adoption of ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs, debt issuance cost is accounted for as a reduction to Long-term debt. Previously debt issuance cost was included in "Accrued interest receivable and other assets" within the accompanying Condensed Consolidated Balance Sheets.

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Loss, Net of Tax (Tables)	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss by Component	The following tables summarize the changes in accumulated other comprehensive (loss) income, net of tax by component: Three months ended March 31, 2016 (In thousands) Available For Sale and Transferred Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ (6,407 ) $ (22,980 ) $ (48,719 ) $ (78,106 ) Other comprehensive income (loss) before reclassifications 7,614 (2,452 ) 201 5,363 Amounts reclassified from accumulated other comprehensive income (loss) (109 ) 1,500 955 2,346 Net current-period other comprehensive income (loss), net of tax 7,505 (952 ) 1,156 7,709 Ending balance $ 1,098 $ (23,932 ) $ (47,563 ) $ (70,397 ) Three months ended March 31, 2015 (In thousands) Available For Sale and Transferred Securities Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ 16,421 $ (25,530 ) $ (47,152 ) $ (56,261 ) Other comprehensive income (loss) before reclassifications 6,994 (3,096 ) 536 4,434 Amounts reclassified from accumulated other comprehensive income (loss) (27 ) 1,326 438 1,737 Net current-period other comprehensive income (loss), net of tax 6,967 (1,770 ) 974 6,171 Ending balance $ 23,388 $ (27,300 ) $ (46,178 ) $ (50,090 )
Schedule of Accumulated Other Comprehensive Loss	The following table provides information for the items reclassified from accumulated other comprehensive loss, net of tax: (In thousands) Three months ended March 31, Associated Line Item in the Condensed Consolidated Statements of Income Accumulated Other Comprehensive Loss Components 2016 2015 Available-for-sale and transferred securities: Unrealized gains (losses) on investment securities $ 320 $ 43 Gain on sale of investment securities, net Unrealized gains (losses) on investment securities (149 ) — Impairment loss recognized in earnings Tax expense (62 ) (16 ) Income tax expense Net of tax $ 109 $ 27 Derivative instruments: Cash flow hedges $ (2,365 ) $ (2,090 ) Total interest expense Tax benefit 865 764 Income tax expense Net of tax $ (1,500 ) $ (1,326 ) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,502 ) $ (672 ) Compensation and benefits Prior service costs (4 ) (18 ) Compensation and benefits Tax benefit 551 252 Income tax expense Net of tax $ (955 ) $ (438 )

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2016
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.: Capital Requirements Actual Minimum Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio At March 31, 2016 Webster Financial Corporation Common equity tier 1 risk-based capital $ 1,833,063 10.6 % $ 776,014 4.5 % $ 1,120,909 6.5 % Total risk-based capital 2,209,420 12.8 1,379,580 8.0 1,724,475 10.0 Tier 1 risk-based capital 1,955,773 11.3 1,034,685 6.0 1,379,580 8.0 Tier 1 leverage capital 1,955,773 8.1 969,807 4.0 1,212,259 5.0 Webster Bank, N.A. Common equity tier 1 risk-based capital $ 1,891,446 11.0 % $ 774,468 4.5 % $ 1,118,677 6.5 % Total risk-based capital 2,067,773 12.0 1,376,833 8.0 1,721,041 10.0 Tier 1 risk-based capital 1,891,446 11.0 1,032,625 6.0 1,376,833 8.0 Tier 1 leverage capital 1,891,446 7.8 968,838 4.0 1,211,047 5.0 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

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share Basic And Diluted	Reconciliation of the calculation of basic and diluted earnings per common share follows: Three months ended March 31, (In thousands, except per share data) 2016 2015 Earnings for basic and diluted earnings per common share: Net income $ 48,617 $ 49,722 Less: Preferred stock dividends 2,024 2,639 Net income available to common shareholders 46,593 47,083 Less: Earnings applicable to participating securities 107 146 Earnings applicable to common shareholders $ 46,486 $ 46,937 Shares: Weighted-average common shares outstanding - basic 91,328 90,251 Effect of dilutive securities: Stock options and restricted stock 452 540 Warrants 29 50 Weighted-average common shares outstanding - diluted 91,809 90,841 Earnings per common share: Basic $ 0.51 $ 0.52 Diluted 0.51 0.52
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: Three months ended March 31, (In thousands) 2016 2015 Stock options (shares with exercise price greater than market price) 213 344 Restricted stock (due to performance conditions on non-participating shares) 129 143

Derivative Financial Instrume37

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value Of Derivative Financial Instruments Designated As Cash Flow Hedges	The following table presents the notional amounts and fair values of derivative positions: At March 31, 2016 At December 31, 2015 Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives (In thousands) Notional Fair Notional Fair Notional Fair Notional Fair Designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives $ 150,000 $ 1,136 $ 150,000 $ 3,868 $ 200,000 $ 2,507 $ 100,000 $ 1,359 Not designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives 503,342 265 2,083,293 81,486 989,695 2,255 1,543,479 40,302 Other 1,102 53 13,849 405 8,237 183 4,561 66 Positions not subject to a master netting agreement (2) Interest rate derivatives 2,130,842 103,133 455,818 126 2,050,460 58,304 482,738 571 RPA-In — — 97,026 343 — — 92,985 245 RPA-Out 55,635 262 — — 41,798 153 — — Other — — 60 9 — — 60 9 Total not designated as hedging instruments 2,690,921 103,713 2,650,046 82,369 3,090,190 60,895 2,123,823 41,193 Gross derivative instruments, before netting $ 2,840,921 104,849 $ 2,800,046 86,237 $ 3,290,190 63,402 $ 2,223,823 42,552 Less: Legally enforceable master netting agreements 1,454 1,454 4,945 4,945 Less: Cash collateral posted — 78,078 — 31,330 Total derivative instruments, after netting $ 103,395 $ 6,705 $ 58,457 $ 6,277 (1) The Company has elected to report derivative positions subject to a legally enforceable master netting agreement on a net basis, net of cash collateral. Refer to the Offsetting derivatives section of this footnote for additional information. (2) Derivative positions not subject to a legally enforceable master netting agreement are reported on a gross basis in the accompanying condensed consolidated balance sheets.
Other Derivatives 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 Condensed Consolidated Statements of Income as follows: Three months ended March 31, (In thousands) 2016 2015 Interest rate derivatives $ 2,333 $ 2,637 RPA (86 ) (76 ) Other (513 ) (42 ) Total impact on non-interest income $ 1,734 $ 2,519
Offsetting Liabilities	Offsetting Derivatives Webster has entered into transactions with counterparties that are subject to a legally enforceable master netting agreement. Derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral. Net positions are recorded in other assets for a net gain position and in other liabilities for a net loss position in the accompanying Condensed Consolidated Balance Sheets. The following table is presented on a gross basis, prior to the application of counterparty netting agreements. Derivative assets and liabilities are shown net of cash collateral: At March 31, 2016 At December 31, 2015 (In thousands) Gross Amount Amount Offset Net Amount (1) (2) Gross Amount Amount Offset Net Amount (1) (2) Derivative instrument assets Hedged Accounting Positions $ 1,136 $ (1,136 ) $ — $ 2,507 $ (2,507 ) $ — Non-Hedged Accounting Positions 318 (318 ) — 2,438 (2,438 ) — Total $ 1,454 $ (1,454 ) $ — $ 4,945 $ (4,945 ) $ — Derivative instrument liabilities Hedged Accounting Positions $ 3,868 $ (3,868 ) $ — $ 1,359 $ (1,359 ) $ — Non-Hedged Accounting Positions 81,891 (75,664 ) 6,227 40,369 (34,916 ) 5,453 Total $ 85,759 $ (79,532 ) $ 6,227 $ 41,728 $ (36,275 ) $ 5,453 (1) Net amount is net of $78.1 million and $31.3 million of cash collateral at March 31, 2016 and December 31, 2015 , respectively, as presented in the accompanying Condensed Consolidated Balance Sheets. (2) Net amount excludes $24.2 million and $20.2 million of initial margin requirements posted at the derivative clearing organization ("DCO") at March 31, 2016 and December 31, 2015 , respectively. Initial margin is recorded as a component of accrued interest receivable and other assets in the accompanying Condensed Consolidated Balance Sheets

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: U.S. Treasury Bills $ 475 $ — $ — $ 475 Agency CMO — 519,742 — 519,742 Agency MBS — 1,071,136 — 1,071,136 Agency CMBS — 365,017 — 365,017 CMBS — 526,825 — 526,825 CLO — 460,953 — 460,953 Single issuer trust preferred securities — 33,424 — 33,424 Corporate debt securities — 100,961 — 100,961 Equity securities 1,936 — — 1,936 Total available-for-sale investment securities 2,411 3,078,058 — 3,080,469 Gross derivative instruments, before netting (1) 53 104,796 — 104,849 Mortgage banking derivatives — 1,273 — 1,273 Investments held in Rabbi Trust 5,068 — — 5,068 Alternative investments — — 4,491 4,491 Originated loans held for sale (2) — 27,273 — 27,273 Contingent consideration — — 7,655 7,655 Total financial assets held at fair value $ 7,532 $ 3,211,400 $ 12,146 $ 3,231,078 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 405 $ 85,832 $ — $ 86,237 Mortgage banking derivatives — 655 — 655 Contingent liability — — 6,000 6,000 Total financial liabilities held at fair value $ 405 $ 86,487 $ 6,000 $ 92,892 At December 31, 2015 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: 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 CMBS — 579,266 — 579,266 CLO — 429,159 — 429,159 Single issuer trust preferred securities — 37,170 — 37,170 Corporate debt securities — 106,321 — 106,321 Equity securities 2,578 — — 2,578 Total available-for-sale investment securities 3,502 2,981,129 — 2,984,631 Gross derivative instruments, before netting (1) 183 63,219 — 63,402 Mortgage banking derivatives — 819 — 819 Investments held in Rabbi Trust 5,372 — — 5,372 Alternative investments — — 3,471 3,471 Originated loans held for sale — — — — Contingent Consideration — — 5,331 5,331 Total financial assets held at fair value $ 9,057 $ 3,045,167 $ 8,802 $ 3,063,026 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 66 $ 42,486 $ — $ 42,552 Mortgage banking derivatives — — — — Contingent liability — — 6,000 6,000 Total financial liabilities held at fair value $ 66 $ 42,486 $ 6,000 $ 48,552 (1) Asset and liability amounts are prior to the impact of netting derivative assets and derivative liabilities of $1,454 and $4,945 , and liability amounts are also prior to offsetting cash collateral paid to the same derivative counterparties of $78,078 and $31,330 , at March 31, 2016 and December 31, 2015 , respectively, when a legally enforceable master netting agreement exists. (2) Loans held for sale accounted for under the fair value option of ASC 820 at March 31, 2016 . The Company made this policy election on loans originated for sale. See Note 1: Summary of Significant Accounting Policies .
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 and liabilities that are measured at fair value on a recurring basis: (In thousands) Alternative Investments Contingent Consideration Total Financial Assets Contingent Liability Balance at January1, 2016 $ 3,471 $ 5,331 $ 8,802 $ 6,000 Unrealized (loss) gain included in net income (1 ) 2,324 2,323 — Purchases/capital funding 1,021 — 1,021 — Balance at March 31, 2016 $ 4,491 $ 7,655 $ 12,146 $ 6,000
Schedule of Servicing Assets at Fair Value [Table Text Block]	The following table presents the changes in fair value for mortgage servicing assets: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 33,568 $ 28,690 Originations of servicing assets 1,913 1,463 Changes in fair value: Due to payoffs/paydowns (1,575 ) (736 ) Due to market changes 190 (1,516 ) Ending balance $ 34,096 $ 27,901
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 as of March 31, 2016 : (Dollars in thousands) Asset Fair Value Valuation Methodology Unobservable Inputs Range of Inputs Collateral dependent impaired loans and leases $ 10,202 Real Estate Appraisals Discount for appraisal type zero - 15% Discount for costs to sell 6% - 20% Other real estate owned $ 420 Real Estate Appraisals Discount for appraisal type 20% Discount for costs to sell 8% Mortgage servicing assets $ 34,096 Discounted cash flow Constant prepayment rate 7.9% - 35.2% Discount rates 1.3% - 2.8%
Summary Of Estimated Fair Values Of Significant Financial Instruments	The estimated fair values of selected financial instruments are as follows: At March 31, 2016 At December 31, 2015 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial Assets: Level 2 Held-to-maturity investment securities $ 4,012,289 $ 4,094,506 $ 3,923,052 $ 3,961,534 Loans held for sale (1) 3,152 3,152 37,091 37,457 Level 3 Loans and leases, net 15,684,154 15,740,120 15,496,745 15,543,892 Mortgage servicing assets 21,026 34,096 20,698 33,568 Alternative investments 12,909 13,936 12,900 14,294 Financial Liabilities: Level 2 Deposit liabilities, other than time deposits $ 16,695,458 $ 16,695,458 $ 15,866,624 $ 15,866,624 Time deposits 2,029,065 2,051,672 2,086,154 2,095,357 Securities sold under agreements to repurchase and other borrowings 910,149 925,890 1,151,400 1,163,974 FHLB advances (2) 2,363,131 2,350,887 2,664,139 2,647,872 Long-term debt (2) 225,323 218,944 226,356 218,143 (1) Loans held for sale accounted for at the lower of cost or market includes commercial loans at March 31, 2016 and both commercial and residential loans at December 31, 2015 . (2) The following adjustments to the carrying amount are not included for determination of fair value, see Note 8: Borrowings : • FHLB advances - unamortized premiums on advances • Long-term debt - unamortized discount and debt issuance cost on senior fixed-rate notes

Reitrement Benefit Plans (Table

Reitrement Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Summary of Net Periodic Benefit Cost	The following table summarizes the components of net periodic benefit cost (benefit): Three months ended March 31, 2016 2015 (In thousands) Webster Pension Webster Other Postretirement Benefits Webster Pension Webster Other Postretirement Benefits Service cost $ 12 $ — $ — $ 10 $ — $ — Interest cost on benefit obligations 2,098 97 31 1,989 86 31 Expected return on plan assets (2,565 ) — — (2,963 ) — — Amortization of prior service cost — — 4 — — 18 Recognized net loss 1,690 130 9 1,427 80 12 Net periodic benefit cost $ 1,235 $ 227 $ 44 $ 463 $ 166 $ 61

Share-Based Plans (Tables)

Share-Based Plans (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Allocation of Share-based Compensation Costs by Plan	The following table provides a summary of stock compensation expense recognized in the accompanying Condensed Consolidated Statements of Income: Three months ended March 31, (In thousands) 2016 2015 Stock options $ 43 $ 164 Restricted stock 2,740 2,118 Total stock compensation expense $ 2,783 $ 2,282
Schedule of Share-based Compensation, Activity	The following table provides a summary of the activity under the Plans for the three months ended March 31, 2016 : Restricted Stock Awards Outstanding 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 Outstanding, at January1, 2016 236,146 $ 32.58 2,088 $ 34.45 115,721 $ 34.14 1,527,074 $ 23.92 Granted 194,754 33.02 12,946 32.89 150,392 32.75 — — Exercised options — — — — — — 22,499 13.36 Vested restricted stock awards (1) 54,413 30.65 3,166 33.92 28,359 33.77 — — Forfeited 1,204 30.04 — — — — — — Outstanding and exercisable, at March 31, 2016 375,283 $ 33.09 11,868 $ 32.89 237,754 $ 33.30 1,504,575 $ 24.08 (1) Vested for purposes of recording compensation expense.

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2016
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: Three months ended March 31, 2016 (In thousands) Commercial Banking Community Banking HSA Bank Private Banking Corporate and Reconciling Consolidated Total Net interest income (loss) $ 65,422 $ 90,056 $ 19,919 $ 2,873 $ (2,118 ) $ 176,152 Provision (benefit) for loan and lease losses 10,248 6,244 — 29 (921 ) 15,600 Net interest income (loss) after provision for loan and lease losses 55,174 83,812 19,919 2,844 (1,197 ) 160,552 Non-interest income 8,783 26,640 21,605 2,365 4,631 64,024 Non-interest expense 28,689 90,876 23,554 5,371 3,252 151,742 Income (loss) before income tax expense 35,268 19,576 17,970 (162 ) 182 72,834 Income tax expense (benefit) 11,727 6,509 5,975 (54 ) 60 24,217 Net income (loss) $ 23,541 $ 13,067 $ 11,995 $ (108 ) $ 122 $ 48,617 Three months ended March 31, 2015 (In thousands) Commercial Banking Community Banking HSA Bank Private Banking Corporate and Reconciling Consolidated Total Net interest income (loss) $ 61,578 $ 84,239 $ 16,465 $ 2,395 $ (4,913 ) $ 159,764 Provision (benefit) for loan and lease losses 3,374 6,421 — (57 ) 12 9,750 Net interest income after provision for loan and lease losses 58,204 77,818 16,465 2,452 (4,925 ) 150,014 Non-interest income 9,525 25,540 15,151 2,326 5,348 57,890 Non-interest expense 26,469 81,690 18,958 4,879 2,094 134,090 Income (loss) before income tax expense 41,260 21,668 12,658 (101 ) (1,671 ) 73,814 Income tax expense (benefit) 13,467 7,073 4,131 (33 ) (546 ) 24,092 Net income (loss) $ 27,793 $ 14,595 $ 8,527 $ (68 ) $ (1,125 ) $ 49,722 Total Assets (In thousands) Commercial Banking Community HSA Bank Private Corporate and Reconciling Consolidated Total At March 31, 2016 $ 7,641,618 $ 8,471,644 $ 102,106 $ 504,911 $ 8,215,230 $ 24,935,509 At December 31, 2015 7,505,513 8,441,950 95,815 493,571 8,106,038 24,642,887

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
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: (In thousands) At March 31, 2016 At December 31, 2015 Commitments to extend credit $ 5,050,534 $ 4,851,994 Standby letter of credit 124,150 133,294 Commercial letter of credit 47,762 45,742 Total credit-related financial instruments with off-balance sheet risk $ 5,222,446 $ 5,031,030
Reserve For Unfunded Credit Commitments	The following table provides a summary of activity in the reserve for unfunded credit commitments: Three months ended March 31, (In thousands) 2016 2015 Beginning balance $ 2,119 $ 5,151 Provision (benefit) 7 (2,831 ) Ending balance $ 2,126 $ 2,320

Summary of Significant Accoun43

Summary of Significant Accounting Policies Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and due from banks		$ 198,174	$ 163,495	$ 199,693	$ 213,914
Accrued interest receivable and other assets		415,552		345,625
Accrued expenses and other liabilities		274,416		233,739
Net increase in accrued interest receivable and other assets		(72,259)	(38,337)
Net increase (decrease) in accrued expenses and other liabilities		(25,193)	(4,088)
Debt Issuance Costs, Net	[1]	$ 1,063		1,096
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and due from banks				251,258
Accrued interest receivable and other assets				328,993
Accrued expenses and other liabilities				267,576
Net increase in accrued interest receivable and other assets			(33,912)
Net increase (decrease) in accrued expenses and other liabilities			14,552
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and due from banks				199,693
Accrued interest receivable and other assets				346,721
Accrued expenses and other liabilities				$ 233,739
Net increase in accrued interest receivable and other assets			(38,117)
Net increase (decrease) in accrued expenses and other liabilities			$ (4,088)
[1]	In accordance with the adoption of ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs, debt issuance cost is accounted for as a reduction to Long-term debt. Previously debt issuance cost was included in "Accrued interest receivable and other assets" within the accompanying Condensed Consolidated Balance Sheets.

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities [Abstract]
Amortized Cost	$ 3,078,857	$ 2,994,924
Unrealized Gains	30,727	22,997
Unrealized Losses	(29,115)	(33,290)
Fair Value	3,080,469	2,984,631
Held-to-maturity Securities [Abstract]
Amortized Cost	4,012,289	3,923,052
Unrealized Gains	89,840	63,894
Unrealized Losses	(7,623)	(25,412)
Fair Value	4,094,506	3,961,534
U.S. Treasury Bills [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	475	924
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	475	924
Agency collateralized mortgage obligations (CMOs) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	511,772	546,168
Unrealized Gains	8,918	5,532
Unrealized Losses	(948)	(2,946)
Fair Value	519,742	548,754
Held-to-maturity Securities [Abstract]
Amortized Cost	384,905	407,494
Unrealized Gains	6,153	3,717
Unrealized Losses	(425)	(2,058)
Fair Value	390,633	409,153
Agency mortgage-backed securities (MBS) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	1,069,685	1,075,941
Unrealized Gains	8,331	6,459
Unrealized Losses	(6,880)	(17,291)
Fair Value	1,071,136	1,065,109
Held-to-maturity Securities [Abstract]
Amortized Cost	2,086,393	2,030,176
Unrealized Gains	44,832	38,813
Unrealized Losses	(6,978)	(19,908)
Fair Value	2,124,247	2,049,081
Agency commercial mortgage-backed securities (ACMBS) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	360,217	215,670
Unrealized Gains	4,880	639
Unrealized Losses	(80)	(959)
Fair Value	365,017	215,350
Held-to-maturity Securities [Abstract]
Amortized Cost	678,969	686,086
Unrealized Gains	15,549	4,253
Unrealized Losses	0	(325)
Fair Value	694,518	690,014
Non-agency Commercial mortgage-backed securities (CMBS) [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	528,189	574,686
Unrealized Gains	5,518	7,485
Unrealized Losses	(6,882)	(2,905)
Fair Value	526,825	579,266
Held-to-maturity Securities [Abstract]
Amortized Cost	372,451	360,018
Unrealized Gains	9,915	5,046
Unrealized Losses	(78)	(2,704)
Fair Value	382,288	362,360
CLO [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	464,394	431,837
Unrealized Gains	525	592
Unrealized Losses	(3,966)	(3,270)
Fair Value	460,953	429,159
Single issuer trust preferred securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	42,220	42,168
Unrealized Gains	0	0
Unrealized Losses	(8,796)	(4,998)
Fair Value	33,424	37,170
Corporate debt securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	98,406	104,031
Unrealized Gains	2,555	2,290
Unrealized Losses	0	0
Fair Value	100,961	106,321
Equities - financial services [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	3,499	3,499
Unrealized Gains	0	0
Unrealized Losses	(1,563)	(921)
Fair Value	1,936	2,578
Municipal bonds and notes [Member]
Held-to-maturity Securities [Abstract]
Amortized Cost	486,777	435,905
Unrealized Gains	13,365	12,019
Unrealized Losses	(142)	(417)
Fair Value	500,000	447,507
Private Label MBS [Member]
Held-to-maturity Securities [Abstract]
Amortized Cost	2,794	3,373
Unrealized Gains	26	46
Unrealized Losses	0	0
Fair Value	$ 2,820	$ 3,419

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	$ 29,115	$ 33,290
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	7,623	25,412
Securities available-for-sale	3,080,469	2,984,631
Pledged Financial Instruments, Not Separately Reported, Securities	2,400,000	2,600,000
Collateralized Loan Obligations Non Volcker Compliant [Member]
Schedule of Investments [Line Items]
Marketable Securities	132,300
Agency collateralized mortgage obligations (CMOs) [Member]
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	948	2,946
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	425	2,058
Securities available-for-sale	519,742	548,754
Agency MBS [Member]
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	6,880	17,291
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	6,978	19,908
Securities available-for-sale	1,071,136	1,065,109
Non-agency Commercial mortgage-backed securities (CMBS) [Member]
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	6,882	2,905
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	78	2,704
Securities available-for-sale	526,825	579,266
CLO [Member]
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	3,966	3,270
Securities available-for-sale	460,953	429,159
Single issuer trust preferred securities [Member]
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	8,796	4,998
Securities available-for-sale	33,424	37,170
Equities - financial services [Member]
Schedule of Investments [Line Items]
Available-for-sale - Accumulated Gross Unrealized Losses Before Tax	1,563	921
Securities available-for-sale	1,936	$ 2,578
Callable at the option of the counterparty [Member]
Schedule of Investments [Line Items]
Securities available-for-sale	$ 1,000,000

Investment Securities (Other Th

Investment Securities (Other Than Temporary Impairment Credit Losses Recognized In Earnings) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance of OTTI, beginning of period	$ 3,288	$ 3,696
Reduction for securities sold, called	0	(99)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	149	0
Balance of OTTI, end of period	$ 3,437	$ 3,597

Investment Securities (Summar47

Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Detail) $ in Thousands	Mar. 31, 2016USD ($)holding	Dec. 31, 2015USD ($)holding
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 719,812	$ 1,295,959
Available for sale, Unrealized Losses - Less Than Twelve Months	(12,784)	(16,177)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	627,442	446,123
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (16,331)	$ (17,113)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	130	156
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 1,347,254	$ 1,742,082
Available for sale, Unrealized Losses - Total	(29,115)	(33,290)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	223,157	977,562
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(758)	(10,831)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	685,962	542,714
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (6,865)	$ (14,581)
Held-to-maturity, Number of Holdings - Total | holding	96	152
Held-to-maturity, Fair Value - Total	$ 909,119	$ 1,520,276
Held-to-maturity, Unrealized Losses - Total	(7,623)	(25,412)
Agency CMO [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	35,571	195,369
Available for sale, Unrealized Losses - Less Than Twelve Months	(166)	(2,195)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	54,475	26,039
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (782)	$ (751)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	4	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 90,046	$ 221,408
Available for sale, Unrealized Losses - Total	(948)	(2,946)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	143,364
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	0	(1,304)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	50,476	27,928
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (425)	$ (754)
Held-to-maturity, Number of Holdings - Total | holding	3	13
Held-to-maturity, Fair Value - Total	$ 50,476	$ 171,292
Held-to-maturity, Unrealized Losses - Total	(425)	(2,058)
Agency MBS [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	129,284	481,839
Available for sale, Unrealized Losses - Less Than Twelve Months	(407)	(6,386)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	502,745	351,911
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (6,473)	$ (10,905)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	72	84
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 632,029	$ 833,750
Available for sale, Unrealized Losses - Total	(6,880)	(17,291)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	155,405	551,918
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(568)	(7,089)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	625,844	470,828
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (6,410)	$ (12,819)
Held-to-maturity, Number of Holdings - Total | holding	58	87
Held-to-maturity, Fair Value - Total	$ 781,249	$ 1,022,746
Held-to-maturity, Unrealized Losses - Total	(6,978)	(19,908)
Agency CMBS [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	40,249	124,241
Available for sale, Unrealized Losses - Less Than Twelve Months	$ (80)	$ (959)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	2	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 40,249	$ 124,241
Available for sale, Unrealized Losses - Total	$ (80)	(959)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		110,864
Held-to-maturity, Unrealized Losses - Less Than Twelve Months		$ (325)
Held-to-maturity, Number of Holdings - Total | holding	0	7
Held-to-maturity, Fair Value - Total		$ 110,864
Held-to-maturity, Unrealized Losses - Total		(325)
Non-agency CMBS [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 258,733	276,330
Available for sale, Unrealized Losses - Less Than Twelve Months	(6,637)	(2,879)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	24,782	19,382
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (245)	$ (26)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	28	29
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 283,515	$ 295,712
Available for sale, Unrealized Losses - Total	(6,882)	(2,905)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	24,532	142,382
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(72)	(1,983)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,265	30,129
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (6)	$ (721)
Held-to-maturity, Number of Holdings - Total | holding	3	18
Held-to-maturity, Fair Value - Total	$ 29,797	$ 172,511
Held-to-maturity, Unrealized Losses - Total	(78)	(2,704)
CLO [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	250,385	211,515
Available for sale, Unrealized Losses - Less Than Twelve Months	(3,363)	(2,709)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	15,670	15,708
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (603)	$ (561)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	15	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 266,055	$ 227,223
Available for sale, Unrealized Losses - Total	(3,966)	(3,270)
Single issuer trust preferred securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,654	4,087
Available for sale, Unrealized Losses - Less Than Twelve Months	(568)	(128)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	29,770	33,083
Available for sale, Unrealized Losses - Twelve Months or Longer	$ (8,228)	$ (4,870)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	8	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 33,424	$ 37,170
Available for sale, Unrealized Losses - Total	(8,796)	(4,998)
Equities - financial services [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,936	2,578
Available for sale, Unrealized Losses - Less Than Twelve Months	$ (1,563)	$ (921)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 1,936	$ 2,578
Available for sale, Unrealized Losses - Total	(1,563)	(921)
Municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	43,220	29,034
Held-to-maturity, Unrealized Losses - Less Than Twelve Months	(118)	(130)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,377	13,829
Held-to-maturity, Unrealized Losses, Twelve Months or Longer	$ (24)	$ (287)
Held-to-maturity, Number of Holdings - Total | holding	32	27
Held-to-maturity, Fair Value - Total	$ 47,597	$ 42,863
Held-to-maturity, Unrealized Losses - Total	$ (142)	$ (417)

Investment Securities (Summar48

Investment Securities (Summary Of Realized Gain (Loss) on Investments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Gain (Loss) on Investments [Line Items]
Proceeds from sales	$ 43,202	$ 0
Gross realized gains on sales	387	43
Less: Gross realized losses on sales	(67)	0
Gain on sale of investment securities, net	$ 320	$ 43

Investment Securities (Summar49

Investment Securities (Summary Of Debt Securities By Contractual Maturity) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Due in one year or less	$ 30,486
Available-for-sale, Amortized Cost - Due after one year through five years	98,406
Available-for-sale, Amortized Cost - Due after five through ten years	467,105
Available-for-sale, Amortized Cost - Due after ten years	2,479,361
Available-for-sale, Amortized Cost - Total debt securities	3,075,358
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, Fair Value - Due in one year or less	29,741
Available-for-sale, Fair Value - Due after one year through five years	100,961
Available-for-sale, Fair Value - Due after five through ten years	462,725
Available-for-sale, Fair Value - Due after ten years	2,485,106
Available-for-sale, Fair Value - Total debt securities	3,078,533
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Held-to-maturity, Amortized Cost - Due in one year or less	11,268
Held-to-maturity, Amortized Cost - Due after one year through five years	30,139
Held-to-maturity, Amortized Cost - Due after five through ten years	43,999
Held-to-maturity, Amortized Cost - Due after ten years	3,926,883
Amortized Cost	4,012,289	$ 3,923,052
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held to Maturity, Fair Value - Due in one year or less	11,395
Held-to-maturity, Fair Value - Due after one year through five years	30,924
Held to Maturity, Fair Value - Due after five through ten years	45,599
Held to Maturity, Fair Value - Due after ten years	4,006,588
Fair Value	$ 4,094,506	$ 3,961,534

Variable Interest Entities Vari

Variable Interest Entities Variable Interest Entity, Consolidated, Carrying Amount, Assets (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 18.9	$ 19
Other Assets [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	25	25.9
Accounts Payable and Accrued Liabilities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	16	16.5
Other Investments [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 13.2	$ 12.1

Loans and Leases (Detail)

Loans and Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 15,858,355	[1]	$ 15,671,735	[1]	$ 14,270,226
Unamortized premiums	19,900		18,000
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,109,243		4,061,001		3,594,272
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,726,869		2,702,560		2,569,437
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,378,760		4,315,999		3,899,810
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,046,911		3,991,649		3,663,071
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 596,572		$ 600,526		$ 543,636
[1]	Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015, respectively.

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral	$ 6,100
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	3	$ 2.8
Write-down of TDR's	$ (11.6)	$ (3.9)

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 196,605		$ 179,403
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3,392		2,051
Financing Receivable, Recorded Investment, Nonaccrual Status	140,875		140,069
Financing Receivable, Recorded Investment, Current	15,661,750		15,492,332
Loans and leases	15,858,355	[1]	15,671,735	[1]	$ 14,270,226
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	37,557		23,751
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	14,781		13,532
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	65,634		71,298
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,354		2,029
Financing Receivable, Recorded Investment, Nonaccrual Status	53,805		54,201
Financing Receivable, Recorded Investment, Current	4,043,609		3,989,703
Loans and leases	4,109,243		4,061,001		3,594,272
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8,100		10,365
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,375		4,703
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases	2,726,869		2,702,560		2,569,437
Consumer Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,624		2,565
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	778		560
Financing Receivable, Recorded Investment, Current	289,204		246,597
Loans and leases	291,828		249,162
Consumer Portfolio Segment [Member] | Other Consumer [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,140		1,390
Consumer Portfolio Segment [Member] | Other Consumer [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	706		615
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	48,956		50,640
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	37,534		37,337
Financing Receivable, Recorded Investment, Current	2,386,085		2,402,758
Loans and leases	2,435,041		2,453,398
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	6,837		9,061
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	4,585		4,242
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases	4,378,760		4,315,999		3,899,810
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	41,789		31,115
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	2,038		22
Financing Receivable, Recorded Investment, Nonaccrual Status	32,482		27,037
Financing Receivable, Recorded Investment, Current	3,565,387		3,531,669
Loans and leases	3,607,176		3,562,784
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	0		0
Financing Receivable, Recorded Investment, Current	771,584		753,215
Loans and leases	771,584		753,215
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,461		768
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Asset Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0		0
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	5,808		3,288
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Asset Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0		0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases	4,046,911		3,991,649		3,663,071
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	32,680		19,016
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	11,948		16,767
Financing Receivable, Recorded Investment, Current	3,774,029		3,673,408
Loans and leases	3,806,709		3,692,424
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	19,843		1,624
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	889		625
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,460		3,461
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	3,460		3,461
Financing Receivable, Recorded Investment, Current	236,742		295,764
Loans and leases	240,202		299,225
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0		0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0		0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,462		1,308
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	868		706
Financing Receivable, Recorded Investment, Current	595,110		599,218
Loans and leases	596,572		600,526		$ 543,636
Finance Leases Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	176		543
Finance Leases Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 418		$ 59
[1]	Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015, respectively.

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 174,990	$ 159,264
Provision (benefit) charged to expense	15,600	9,750
Charge-offs	(18,900)	(9,674)
Recoveries	2,511	2,630
Balance, end of period	174,990	159,264	$ 174,201		$ 174,990		$ 161,970
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			18,380				27,240
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			155,821				134,730
Financing Receivable, Individually Evaluated for Impairment			279,707				313,873
Financing Receivable, Collectively Evaluated for Impairment			15,578,648				13,956,353
Loans and leases			15,858,355	[1]	15,671,735	[1]	14,270,226
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	25,876	25,452
Provision (benefit) charged to expense	2,327	4,144
Charge-offs	(1,594)	(1,955)
Recoveries	721	108
Balance, end of period	25,876	25,452	27,330		25,876		27,749
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			10,044				14,350
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			17,286				13,399
Financing Receivable, Individually Evaluated for Impairment			130,133				140,362
Financing Receivable, Collectively Evaluated for Impairment			3,979,110				3,453,910
Loans and leases			4,109,243		4,061,001		3,594,272
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	42,052	43,518
Provision (benefit) charged to expense	2,791	2,232
Charge-offs	(4,421)	(4,296)
Recoveries	1,214	1,162
Balance, end of period	42,052	43,518	41,636		42,052		42,616
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			3,037				4,255
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			38,599				38,361
Financing Receivable, Individually Evaluated for Impairment			48,096				50,719
Financing Receivable, Collectively Evaluated for Impairment			2,678,773				2,518,718
Loans and leases			2,726,869		2,702,560		2,569,437
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	66,686	52,114
Provision (benefit) charged to expense	10,536	2,754
Charge-offs	(11,208)	(255)
Recoveries	457	1,015
Balance, end of period	66,686	52,114	66,471		66,686		55,628
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			3,235				4,939
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			63,236				50,689
Financing Receivable, Individually Evaluated for Impairment			64,847				49,311
Financing Receivable, Collectively Evaluated for Impairment			4,313,913				3,850,499
Loans and leases			4,378,760		4,315,999		3,899,810
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	34,889	32,102
Provision (benefit) charged to expense	(119)	1,398
Charge-offs	(1,526)	(3,153)
Recoveries	74	202
Balance, end of period	34,889	32,102	33,318		34,889		30,549
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			2,022				3,668
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			31,296				26,881
Financing Receivable, Individually Evaluated for Impairment			35,619				72,850
Financing Receivable, Collectively Evaluated for Impairment			4,011,292				3,590,221
Loans and leases			4,046,911		3,991,649		3,663,071
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,487	6,078
Provision (benefit) charged to expense	65	(778)
Charge-offs	(151)	(15)
Recoveries	45	143
Balance, end of period	$ 5,487	$ 6,078	5,446		5,487		5,428
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			42				28
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			5,404				5,400
Financing Receivable, Individually Evaluated for Impairment			1,012				631
Financing Receivable, Collectively Evaluated for Impairment			595,560				543,005
Loans and leases			$ 596,572		$ 600,526		$ 543,636
[1]	Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015, respectively.

Loans and Leases (Impaired Loan

Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 319,719	$ 316,542
Total Recorded Investment	279,707	279,171
Recorded Investment No Allowance	105,743	95,225
Recorded Investment With Allowance	173,964	183,946
Related Valuation Allowance	18,380	22,204
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	143,159	148,144
Total Recorded Investment	130,133	134,448
Recorded Investment No Allowance	22,191	23,024
Recorded Investment With Allowance	107,942	111,424
Related Valuation Allowance	10,044	10,364
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	53,210	56,680
Total Recorded Investment	48,096	48,425
Recorded Investment No Allowance	24,806	25,130
Recorded Investment With Allowance	23,290	23,295
Related Valuation Allowance	3,037	3,477
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	83,347	67,116
Total Recorded Investment	64,847	56,581
Recorded Investment No Allowance	38,119	31,600
Recorded Investment With Allowance	26,728	24,981
Related Valuation Allowance	3,235	5,197
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	31,686	36,980
Total Recorded Investment	29,657	33,333
Recorded Investment No Allowance	14,687	9,204
Recorded Investment With Allowance	14,970	24,129
Related Valuation Allowance	2,019	3,160
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,010	7,010
Total Recorded Investment	5,962	5,962
Recorded Investment No Allowance	5,940	5,939
Recorded Investment With Allowance	22	23
Related Valuation Allowance	3	3
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,307	612
Total Recorded Investment	1,012	422
Recorded Investment No Allowance	0	328
Recorded Investment With Allowance	1,012	94
Related Valuation Allowance	$ 42	$ 3

Loans and Leases (Interest Inco

Loans and Leases (Interest Income From Impaired Loans And Leases, By Class) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 279,440	$ 323,706
Accrued Interest Income	2,120	2,421
Cash Basis Interest Income	576	538
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	132,291	141,625
Accrued Interest Income	1,115	1,059
Cash Basis Interest Income	317	256
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	48,261	50,604
Accrued Interest Income	349	361
Cash Basis Interest Income	259	282
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	60,714	43,037
Accrued Interest Income	472	427
Cash Basis Interest Income	0	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	5,962	6,171
Accrued Interest Income	35	33
Cash Basis Interest Income	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	31,495	81,637
Accrued Interest Income	148	530
Cash Basis Interest Income	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	717	632
Accrued Interest Income	1	11
Cash Basis Interest Income	$ 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	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	$ 15,858,355	[1]	$ 15,671,735	[1]	$ 14,270,226
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	4,378,760		4,315,999		3,899,810
Commercial Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	4,060,128		4,023,255
Commercial Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	101,340		70,904
Commercial Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	216,098		220,389
Commercial Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	1,194		1,451
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	4,046,911		3,991,649		3,663,071
Commercial Real Estate Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	3,897,741		3,857,019
Commercial Real Estate Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	36,700		55,030
Commercial Real Estate Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	112,165		79,289
Commercial Real Estate Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	305		311
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	596,572		600,526		$ 543,636
Finance Leases Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	574,782		586,445
Finance Leases Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	8,234		1,628
Finance Leases Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	13,556		12,453
Finance Leases Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases	$ 0		$ 0
[1]	Loans and leases include net deferred fees and net premiums and discounts of $19.9 million and $18.0 million at March 31, 2016 and December 31, 2015, respectively.

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs	[1]	$ 257,660	$ 272,690
Accruing TDRs performing under modified terms more than one year (as a percent)		55.20%	55.00%
Specific reserves for TDRs included in the balance of allowance for loan and lease losses		$ 174,201	$ 174,990	$ 161,970	$ 159,264
Additional funds committed to borrowers in TDR status		1,700	1,133
Troubled Debt Restructures [Member]
Financing Receivable, Modifications [Line Items]
Interest Receivable		1,000	1,100
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		172,036	171,784
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		85,624	100,906
Specific reserves for TDRs included in the balance of allowance for loan and lease losses		$ 16,123	$ 21,405
[1]	Total recorded investment of TDRs excludes $1.0 million and $1.1 million of accrued interest receivable at March 31, 2016 and December 31, 2015, respectively.

Loans and Leases (Information o

Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Detail) $ in Thousands		3 Months Ended
		Mar. 31, 2016USD ($)loan	Mar. 31, 2015USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		42	58
Post-Modification Recorded Investment | $	[1]	$ 18,572	$ 5,989
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		5	9
Post-Modification Recorded Investment | $	[1]	$ 664	$ 1,345
Residential Portfolio Segment [Member] | Adjusted Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		1	0
Post-Modification Recorded Investment | $	[1]	$ 236	$ 0
Residential Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		0	10
Post-Modification Recorded Investment | $	[1]	$ 0	$ 1,668
Residential Portfolio Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	7	3
Post-Modification Recorded Investment | $	[1],[2]	$ 1,415	$ 536
Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		1	4
Post-Modification Recorded Investment | $	[1]	$ 99	$ 499
Consumer Portfolio Segment [Member] | Adjusted Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		0	0
Post-Modification Recorded Investment | $	[1]	$ 0	$ 0
Consumer Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		4	8
Post-Modification Recorded Investment | $	[1]	$ 300	$ 444
Consumer Portfolio Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	7	21
Post-Modification Recorded Investment | $	[1],[2]	$ 338	$ 1,332
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		9	1
Post-Modification Recorded Investment | $	[1]	$ 14,649	$ 33
Commercial Portfolio Segment [Member] | Adjusted Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		0	0
Post-Modification Recorded Investment | $	[1]	$ 0	$ 0
Commercial Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		1	2
Post-Modification Recorded Investment | $	[1]	$ 4	$ 132
Commercial Portfolio Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	4	0
Post-Modification Recorded Investment | $	[1],[2]	$ 310	$ 0
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		0	0
Post-Modification Recorded Investment | $	[1]	$ 0	$ 0
Commercial Real Estate Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		1	0
Post-Modification Recorded Investment | $	[1]	$ 44	$ 0
Commercial Real Estate Portfolio Segment [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	[2]	1	0
Post-Modification Recorded Investment | $	[1],[2]	$ 509	$ 0
Finance Leases Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan		1	0
Post-Modification Recorded Investment | $	[1]	$ 4	$ 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 (Information60

Loans and Leases (Information on Loans and Leases Modified as TDR within the Previous 12 Months (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)loan	Mar. 31, 2015USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	15	8
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 13,781	$ 18,140
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	3	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 699	$ 642
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 90	$ 251
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	9	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 12,587	$ 6,317
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | loan	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 405	$ 10,930

Loans and Leases (Investments i

Loans and Leases (Investments in TDRs, Segregated by Risk Rating Exposure) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs	[1]	$ 257,660	$ 272,690
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		79,432	89,818
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (1) - (6) Pass [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		12,197	12,970
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (7) Special Mention [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		2,959	2,999
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (8) Substandard [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		64,008	72,132
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (9) Doubtful [Member]
Financing Receivable, Modifications [Line Items]
Total recorded investment of TDRs		$ 268	$ 1,717
[1]	Total recorded investment of TDRs excludes $1.0 million and $1.1 million of accrued interest receivable at March 31, 2016 and December 31, 2015, respectively.

Transfers of Financial Assets62

Transfers of Financial Assets (Reserve for loan repurchases) (Detail) - Loan Purchase Commitments [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 1,192	$ 1,059
Provision charged to expense	25	23
Repurchased loans and settlements charged off	(98)	0
Ending balance	$ 1,119	$ 1,082

Transfers of Financial Assets63

Transfers of Financial Assets (Loans sold) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale	$ 2,629	$ 1,561
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	85,161	76,895
Net gain on sale	1,605	1,561
Fair value option adjustment	1,024	0
Loans sold with servicing rights retained	$ 79,360	$ 69,265

Transfers of Financial Assets a

Transfers of Financial Assets and Mortgage Servicing Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans not originated for sale	$ 8,247	$ 32,915
Residential Mortgage [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights	2,500,000		$ 2,509,038
Bank servicing fees	300	400
Commercial Loan [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans not originated for sale	$ 8,200
Consumer Loan [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans not originated for sale		$ 32,900

Goodwill and Other Intangible65

Goodwill and Other Intangible Assets (Gross Carrying Value And Accumulated Amortization Of Other Intangible Assets) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 92,420	$ 92,420
Accumulated Amortization	(54,648)	(53,094)
Net Carrying Amount	37,772	39,326
HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43,000	43,000
Accumulated Amortization	(5,990)	(4,817)
Net Carrying Amount	37,010	38,183
Core Deposits [Member] | Community Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,420	49,420
Accumulated Amortization	(48,658)	(48,277)
Net Carrying Amount	762	1,143
Core Deposits [Member] | HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,000	22,000
Accumulated Amortization	(4,038)	(3,269)
Net Carrying Amount	17,962	18,731
Customer Relationships [Member] | HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,000	21,000
Accumulated Amortization	(1,952)	(1,548)
Net Carrying Amount	$ 19,048	$ 19,452

Goodwill and Other Intangible66

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Mar. 31, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2016	$ 4,098
2,017	4,062
2,018	3,847
2,019	3,847
2,020	3,847
Thereafter	$ 18,071

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Non-interest-bearing:
Demand	$ 3,625,605	$ 3,713,063
Interest-bearing:
Checking	2,421,692	2,369,971
Health savings accounts	4,084,190	3,802,313
Money market	2,319,588	1,933,460
Savings	4,244,383	4,047,817
Time deposits	2,029,065	2,086,154
Total interest-bearing	15,098,918	14,239,715
Total deposits	18,724,523	17,952,778
Time deposits and interest-bearing checking, included in above balances, obtained through brokers	840,617	910,304
Time deposits, included in above balance, that meet or exceed the Federal Deposit Insurance Corporation limit	505,665	542,206
Demand deposit overdrafts reclassified as loan balances	$ 1,925	$ 1,356

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Remainder of 2016	$ 760,077
2,017	373,241
2,018	260,971
2,019	437,059
2,020	171,163
Thereafter	26,554
Total time deposits	$ 2,029,065	$ 2,086,154

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 688,149	$ 834,400
Fed funds purchased	222,000	317,000
Securities sold under agreements to repurchase and other borrowings	910,149	1,151,400
Original maturity of one year or less [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	288,149	334,400
Original maturity of greater than one year, non-callable [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 400,000	$ 500,000

Borrowings Federal Home Loan Ad

Borrowings Federal Home Loan Advances (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Total Outstanding	$ 1,700,000	$ 2,025,934
FHLB advances maturing after 1 but within 2 years, Total Outstanding	50,500	500
FHLB advances maturing after 2 but within 3 years, Total Outstanding	175,000	200,000
FHLB advances maturing after 3 but within 4 years, Total Outstanding	153,026	103,026
FHLB advances maturing after 4 but within 5 years, Total Outstanding	125,000	175,000
FHLB advances maturing after 5 years, Total Outstanding	159,584	159,655
Federal Home Loan Bank, Advances	2,363,110	2,664,115
Premiums on advances	21	24
Federal Home Loan Bank advances	$ 2,363,131	$ 2,664,139
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]
FHLB advances maturing within 1 year, Weighted Average Contractual Coupon Rate (as a percent)	0.53%	0.55%
FHLB advances maturing after 1 but within 2 years, Weighted Average Contractual Coupon Rate (as a percent)	1.10%	5.66%
FHLB advances maturing after 2 but within 3 years, Weighted Average Contractual Coupon Rate (as a percent)	1.45%	1.36%
FHLB advances maturing after 3 but within 4 years, Weighted Average Contractual Coupon Rate (as a percent)	1.68%	1.54%
FHLB advances maturing after 4 but within 5 years, Weighted Average Contractual Coupon Rate (as a percent)	1.83%	1.77%
FHLB advances maturing after 5 years, Weighted Average Contractual Coupon Rate (as a percent)	1.62%	1.60%
Federal Home Loan Bank, Advances, Weighted Average Contractual Coupon Rate (as a percent)	0.83%	0.79%

Borrowings Federal Home Loan 71

Borrowings Federal Home Loan Advances (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank, Advances [Line Items]
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	$ 5,600	$ 5,700
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	1,400	1,200
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 (Deta

Borrowings Long Term Debt (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Notes and subordinated debt		$ 227,320	$ 227,320
Debt issuance cost on senior fixed-rates	[1]	(1,063)	(1,096)
Long-term debt		$ 225,323	$ 225,260
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		3.59%	3.48%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Derivative, Basis Spread on Variable Rate (as a percent)		2.95%
Long-term Debt [Member]
Debt Instrument [Line Items]
Discount on senior fixed-rate notes		$ (934)	$ (964)
Senior Notes [Member]
Debt Instrument [Line Items]
Notes and subordinated debt		150,000	150,000
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	[2]	$ 77,320	$ 77,320
[1]	In accordance with the adoption of ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs, debt issuance cost is accounted for as a reduction to Long-term debt. Previously debt issuance cost was included in "Accrued interest receivable and other assets" within the accompanying Condensed Consolidated Balance Sheets.
[2]	The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 3.59% at March 31, 2016 and 3.48% at December 31, 2015.

Accumulated Other Comprehensi73

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (78,106)	$ (56,261)
Other comprehensive income (loss) before reclassifications	5,363	4,434
Amounts reclassified from accumulated other comprehensive income (loss)	2,346	1,737
Other comprehensive income, net of tax	7,709	6,171
Ending balance	(70,397)	(50,090)
Available For Sale and Transferred Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,407)	16,421
Other comprehensive income (loss) before reclassifications	7,614	6,994
Amounts reclassified from accumulated other comprehensive income (loss)	(109)	(27)
Other comprehensive income, net of tax	7,505	6,967
Ending balance	1,098	23,388
Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,980)	(25,530)
Other comprehensive income (loss) before reclassifications	(2,452)	(3,096)
Amounts reclassified from accumulated other comprehensive income (loss)	1,500	1,326
Other comprehensive income, net of tax	(952)	(1,770)
Ending balance	(23,932)	(27,300)
Defined Benefit Pension and Other Postretirement Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(48,719)	(47,152)
Other comprehensive income (loss) before reclassifications	201	536
Amounts reclassified from accumulated other comprehensive income (loss)	955	438
Other comprehensive income, net of tax	1,156	974
Ending balance	$ (47,563)	$ (46,178)

Accumulated Other Comprehensi74

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Impairment loss recognized in earnings	$ (149)	$ 0
Net income	48,617	49,722
Total interest expense	(26,183)	(23,148)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,346)	(1,737)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	109	27
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investment securities, net	320	43
Net income	109	27
Income tax expense	(62)	(16)
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 recognized in earnings	(149)	0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,500)	(1,326)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net income	(1,500)	(1,326)
Total interest expense	(2,365)	(2,090)
Income tax expense	865	764
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits	(1,502)	(672)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits	(4)	(18)
Defined benefit pension and postretirement benefit plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	551	252
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (955)	$ (438)

Regulatory Matters (Information

Regulatory Matters (Information On The Capital Ratios) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 1,833,063		$ 1,825,717
Common equity tier 1, Actual Ratio	10.60%		10.70%
Common equity tier 1, Capital Requirements, Minimum Amount	$ 776,014		$ 766,928
Common equity tier 1, Capital Requirements, Minimum Ratio	4.50%		4.50%
Common equity tier 1, Capital Requirements, Well Capitalized Amount	$ 1,120,909		$ 1,107,785
Common equity tier 1, Capital Requirements, Well Capitalized Ratio	6.50%		6.50%
Total risk-based capital, Actual Amount	$ 2,209,420		$ 2,201,928
Total risk-based capital, Actual Ratio	12.80%		12.90%
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,379,580		$ 1,363,427
Total risk-based capital, Capital Requirements, Minimum Ratio	8.00%		8.00%
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 1,724,475		$ 1,704,284
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	10.00%		10.00%
Tier 1 capital, Actual Amount	$ 1,955,773		$ 1,966,829
Tier 1 capital, Actual Ratio	11.30%		11.50%
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,034,685		$ 1,022,570
Tier 1 capital, Capital Requirements, Minimum Ratio	6.00%		6.00%
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,379,580		$ 1,363,427
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	8.00%		8.00%
Tier 1 leverage capital ratio, Actual Amount	$ 1,955,773		$ 1,966,829
Tier 1 leverage capital ratio, Actual Ratio	8.10%		8.20%
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 969,807		$ 954,403
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	4.00%		4.00%
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 1,212,259		$ 1,193,004
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	5.00%		5.00%
Dividends paid	$ 30,000	$ 20,000
Cash Pass-through Reserve, Federal Home Loan Bank	73,200		$ 109,400
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 1,891,446		$ 1,870,852
Common equity tier 1, Actual Ratio	11.00%		11.00%
Common equity tier 1, Capital Requirements, Minimum Amount	$ 774,468		$ 765,232
Common equity tier 1, Capital Requirements, Minimum Ratio	4.50%		4.50%
Common equity tier 1, Capital Requirements, Well Capitalized Amount	$ 1,118,677		$ 1,105,335
Common equity tier 1, Capital Requirements, Well Capitalized Ratio	6.50%		6.50%
Total risk-based capital, Actual Amount	$ 2,067,773			$ 2,047,961
Total risk-based capital, Actual Ratio	12.00%			12.00%
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,376,833			$ 1,360,412
Total risk-based capital, Capital Requirements, Minimum Ratio	8.00%			8.00%
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 1,721,041			$ 1,700,515
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	10.00%			10.00%
Tier 1 capital, Actual Amount	$ 1,891,446			$ 1,870,852
Tier 1 capital, Actual Ratio	11.00%			11.00%
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,032,625			$ 1,020,309
Tier 1 capital, Capital Requirements, Minimum Ratio	6.00%			6.00%
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,376,833			$ 1,360,412
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	8.00%			8.00%
Tier 1 leverage capital ratio, Actual Amount	$ 1,891,446			$ 1,870,852
Tier 1 leverage capital ratio, Actual Ratio	7.80%			7.90%
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 968,838			$ 953,371
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	4.00%			4.00%
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 1,211,047			$ 1,191,714
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	5.00%			5.00%

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
	Mar. 31, 2016	Mar. 31, 2015
Earnings for basic and diluted earnings per common share:
Net income	$ 48,617	$ 49,722
Net Income (Loss) Attributable to Parent, Diluted	48,617	49,722
Less: Preferred stock dividends	2,024	2,639
Net income available to common shareholders	46,593	47,083
Net Income (Loss) Available to Common Stockholders, Diluted	46,593	47,083
Less: Earnings applicable to participating securities	107	146
Earnings applicable to common shareholders	46,486	46,937
Undistributed Earnings, Diluted	$ 46,486	$ 46,937
Shares:
Weighted average common shares outstanding - basic (in shares)	91,328	90,251
Effect of dilutive securities:
Stock options and restricted stock (in shares)	452	540
Warrants (in shares)	29	50
Weighted-average common shares outstanding - diluted (in shares)	91,809	90,841
Earnings per common share:
Basic (in dollars per share)	$ 0.51	$ 0.52
Diluted (in dollars per share)	$ 0.51	$ 0.52

Earnings Per Common Share Sched

Earnings Per Common Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
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	344
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	129	143

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Detail) shares in Millions	3 Months Ended
	Mar. 31, 2016shares
Employee Stock Option [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	(1.1)

Derivative Financial Instrume79

Derivative Financial Instruments (Risk Management Objective of Using Derivatives) (Narrative) (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Derivative [Line Items]
Interest expense related to previous fair value hedges	$ 1,734,000	$ 2,519,000
Designated as Hedging Instrument [Member] | Interest Expense [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest expense related to previous fair value hedges	$ 0		$ 0

Derivative Financial Instrume80

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		$ 24,200	$ 20,200
Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,454	4,945
Derivative Asset, Fair Value, Amount Offset Against Collateral		1,454	4,945
Derivative Asset	[1],[2]	0	0
Derivative Liability, Fair Value, Gross Liability		85,759	41,728
Derivative Liability, Fair Value, Amount Offset Against Collateral		79,532	36,275
Derivative liability	[1],[2]	6,227	5,453
Subject to and not subject to Master Netting Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount		2,840,921	3,290,190
Derivative Asset, Fair Value, Gross Asset		104,849	63,402
Derivative Asset, Fair Value, Amount Offset Against Collateral		1,454	4,945
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0	0
Derivative Asset		103,395	58,457
Derivative Liability, Notional Amount		2,800,046	2,223,823
Derivative Liability, Fair Value, Gross Liability		86,237	42,552
Derivative Liability, Fair Value, Amount Offset Against Collateral		1,454	4,945
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		78,078	31,330
Derivative liability		6,705	6,277
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,136	2,507
Derivative Asset, Collateral, Obligation to Return Cash, Offset		1,136	2,507
Derivative Asset	[1],[2]	0	0
Derivative Liability, Fair Value, Gross Liability		3,868	1,359
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		3,868	1,359
Derivative liability	[1],[2]	0	0
Designated as Hedging Instrument [Member] | Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member] | Interest Rate Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount		150,000	200,000
Derivative Asset, Fair Value, Gross Asset		1,136	2,507
Derivative Liability, Notional Amount		150,000	100,000
Derivative Liability, Fair Value, Gross Liability		3,868	1,359
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		318	2,438
Derivative Asset, Collateral, Obligation to Return Cash, Offset		318	2,438
Derivative Asset	[1],[2]	0	0
Derivative Liability, Fair Value, Gross Liability		81,891	40,369
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		75,664	34,916
Derivative liability	[1],[2]	6,227	5,453
Not Designated as Hedging Instrument [Member] | Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member] | Interest Rate Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[3]	503,342	989,695
Derivative Asset, Fair Value, Gross Asset	[3]	265	2,255
Derivative Liability, Notional Amount	[3]	2,083,293	1,543,479
Derivative Liability, Fair Value, Gross Liability	[3]	81,486	40,302
Not Designated as Hedging Instrument [Member] | Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member] | Other [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[3]	1,102	8,237
Derivative Asset, Fair Value, Gross Asset	[3]	53	183
Derivative Liability, Notional Amount	[3]	13,849	4,561
Derivative Liability, Fair Value, Gross Liability	[3]	405	66
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[4]	2,690,921	3,090,190
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	[4]	103,713	60,895
Derivative Liability, Notional Amount	[4]	2,650,046	2,123,823
Derivative Liability, Not Subject to Master Netting Arrangement Deduction	[4]	82,369	41,193
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Interest Rate Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[4]	2,130,842	2,050,460
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	[4]	103,133	58,304
Derivative Liability, Notional Amount	[4]	455,818	482,738
Derivative Liability, Not Subject to Master Netting Arrangement Deduction	[4]	126	571
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | RPA [Member] | RPA-In [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[4]	0	0
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	[4]	0	0
Derivative Liability, Notional Amount	[4]	97,026	92,985
Derivative Liability, Not Subject to Master Netting Arrangement Deduction	[4]	343	245
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | RPA [Member] | RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[4]	55,635	41,798
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	[4]	262	153
Derivative Liability, Notional Amount	[4]	0	0
Derivative Liability, Not Subject to Master Netting Arrangement Deduction	[4]	0	0
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Other [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	[4]	0	0
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	[4]	0	0
Derivative Liability, Notional Amount	[4]	60	60
Derivative Liability, Not Subject to Master Netting Arrangement Deduction	[4]	$ 9	$ 9
[1]	(1) Net amount is net of $78.1 million and $31.3 million of cash collateral at March 31, 2016 and December 31, 2015, respectively, as presented in the accompanying Condensed Consolidated Balance Sheets.
[2]	(2) Net amount excludes $24.2 million and $20.2 million of initial margin requirements posted at the derivative clearing organization ("DCO") at March 31, 2016 and December 31, 2015, respectively. Initial margin is recorded as a component of accrued interest receivable and other assets in the accompanying Condensed Consolidated Balance Sheets
[3]	The Company has elected to report derivative positions subject to a legally enforceable master netting agreement on a net basis, net of cash collateral. Refer to the Offsetting derivatives section of this footnote for additional information.
[4]	Derivative positions not subject to a legally enforceable master netting agreement are reported on a gross basis in the accompanying condensed consolidated balance sheets.

Derivative Financial Instrume81

Derivative Financial Instruments (Schedule of the changes in the fair value of non-hedge accounting derivatives) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 1,734	$ 2,519
Interest Rate Derivatives [Member] | Operating Expense [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	2,333	2,637
RPA [Member] | Operating Expense [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(86)	(76)
Other [Member] | Operating Expense [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ (513)	$ (42)

Derivative Financial Instrume82

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) - Cash Flow Hedging [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 7.8
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	(26.7)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 2

Derivative Financial Instrume83

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		$ (24,200)	$ (20,200)
Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,136	2,507
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(1,136)	(2,507)
Derivative Asset	[1],[2]	0	0
Derivative Liability, Fair Value, Gross Liability		3,868	1,359
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(3,868)	(1,359)
Derivative liability	[1],[2]	0	0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		318	2,438
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(318)	(2,438)
Derivative Asset	[1],[2]	0	0
Derivative Liability, Fair Value, Gross Liability		81,891	40,369
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(75,664)	(34,916)
Derivative liability	[1],[2]	6,227	5,453
Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,454	4,945
Derivative Asset	[1],[2]	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		(1,454)	(4,945)
Derivative Liability, Fair Value, Gross Liability		85,759	41,728
Derivative liability	[1],[2]	6,227	5,453
Derivative Liability, Fair Value, Amount Offset Against Collateral		$ (79,532)	$ (36,275)
[1]	(1) Net amount is net of $78.1 million and $31.3 million of cash collateral at March 31, 2016 and December 31, 2015, respectively, as presented in the accompanying Condensed Consolidated Balance Sheets.
[2]	(2) Net amount excludes $24.2 million and $20.2 million of initial margin requirements posted at the derivative clearing organization ("DCO") at March 31, 2016 and December 31, 2015, respectively. Initial margin is recorded as a component of accrued interest receivable and other assets in the accompanying Condensed Consolidated Balance Sheets

Derivative Financial Instrume84

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 102,300
Derivative Asset, Collateral, Obligation to Return Cash, Offset	24,200	$ 20,200
Credit Derivative, Maximum Exposure, Undiscounted	103,100
Market Approach Valuation Technique [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	21,000
Subject to and not subject to Master Netting Agreements [Member]
Derivative [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	$ 78,078	$ 31,330

Derivative Financial Instrume85

Derivative Financial Instruments (Mortgage Banking Derivatives Narrative) (Detail) $ in Millions	Mar. 31, 2016USD ($)
Derivative [Line Items]
Outstanding rate locks	$ 83.6
Outstanding commitments to sell residential mortgage loans	82.2
Mandatory forward commitments	$ 81

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 5,222,446	$ 5,031,030
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	5,100
Rabbi Trust [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	3,600
Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 5,800

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring Basis) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Financial assets held at fair value:
Originated loans held for sale		$ 27,273		$ 0
Subject to and not subject to Master Netting Agreements [Member]
Financial assets held at fair value:
Derivative Asset		103,395		58,457
Financial liabilities held at fair value:
Derivative liability		6,705		6,277
Derivative Asset, Fair Value, Amount Offset Against Collateral		1,454		4,945
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		78,078		31,330
Fair Value, Measurements, Recurring [Member]
Financial assets held at fair value:
Originated loans held for sale	[1]	27,273
Total financial assets held at fair value		3,231,078		3,063,026
Financial liabilities held at fair value:
Derivative liability	[2]	86,237		42,552
Contingent liability		6,000		6,000
Total financial liabilities held at fair value		92,892		48,552
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
Financial assets held at fair value:
Other assets		7,655		5,331
Fair Value, Measurements, Recurring [Member] | Derivative instruments [Member]
Financial assets held at fair value:
Derivative Asset	[2]	104,849		63,402
Fair Value, Measurements, Recurring [Member] | Mortgage banking derivatives [Member]
Financial assets held at fair value:
Derivative Asset		1,273		819
Financial liabilities held at fair value:
Derivative liability		655		0
Fair Value, Measurements, Recurring [Member] | Available-for-sale Investment Securities [Member]
Financial assets held at fair value:
Available for sale investment securities		3,080,469		2,984,631
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Bills [Member]
Financial assets held at fair value:
Available for sale investment securities		475		924
Fair Value, Measurements, Recurring [Member] | Agency CMO [Member]
Financial assets held at fair value:
Available for sale investment securities		519,742		548,754
Fair Value, Measurements, Recurring [Member] | Agency MBS [Member]
Financial assets held at fair value:
Available for sale investment securities		1,071,136		1,065,109
Fair Value, Measurements, Recurring [Member] | Agency CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		365,017		215,350
Fair Value, Measurements, Recurring [Member] | CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		526,825		579,266
Fair Value, Measurements, Recurring [Member] | CLO [Member]
Financial assets held at fair value:
Available for sale investment securities		460,953		429,159
Fair Value, Measurements, Recurring [Member] | Single issuer trust preferred securities [Member]
Financial assets held at fair value:
Available for sale investment securities		33,424		37,170
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Financial assets held at fair value:
Available for sale investment securities		100,961		106,321
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]
Financial assets held at fair value:
Available for sale investment securities		1,936		2,578
Fair Value, Measurements, Recurring [Member] | Investments held In Rabbi Trust [Member]
Financial assets held at fair value:
Other assets		5,068		5,372
Fair Value, Measurements, Recurring [Member] | Alternative investments [Member]
Financial assets held at fair value:
Other assets		4,491		3,471
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Originated loans held for sale		0	[1]	0
Total financial assets held at fair value		7,532		9,057
Financial liabilities held at fair value:
Derivative liability	[2]	405		66
Total financial liabilities held at fair value		405		66
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Contingent Consideration [Member]
Financial assets held at fair value:
Other assets		0		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Derivative instruments [Member]
Financial assets held at fair value:
Derivative Asset	[2]	53		183
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Mortgage banking derivatives [Member]
Financial assets held at fair value:
Derivative Asset		0		0
Financial liabilities held at fair value:
Derivative liability		0		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Available-for-sale Investment Securities [Member]
Financial assets held at fair value:
Available for sale investment securities		2,411		3,502
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | U.S. Treasury Bills [Member]
Financial assets held at fair value:
Available for sale investment securities		475		924
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Agency CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		0		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		0		0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Equity securities [Member]
Financial assets held at fair value:
Available for sale investment securities		1,936		2,578
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Investments held In Rabbi Trust [Member]
Financial assets held at fair value:
Other assets		5,068		5,372
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Alternative investments [Member]
Financial assets held at fair value:
Other assets		0		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Originated loans held for sale		27,273	[1]	0
Total financial assets held at fair value		3,211,400		3,045,167
Financial liabilities held at fair value:
Derivative liability	[2]	85,832		42,486
Total financial liabilities held at fair value		86,487		42,486
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Contingent Consideration [Member]
Financial assets held at fair value:
Other assets		0		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative instruments [Member]
Financial assets held at fair value:
Derivative Asset	[2]	104,796		63,219
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage banking derivatives [Member]
Financial assets held at fair value:
Derivative Asset		1,273		819
Financial liabilities held at fair value:
Derivative liability		655		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale Investment Securities [Member]
Financial assets held at fair value:
Available for sale investment securities		3,078,058		2,981,129
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency CMO [Member]
Financial assets held at fair value:
Available for sale investment securities		519,742		548,754
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency MBS [Member]
Financial assets held at fair value:
Available for sale investment securities		1,071,136		1,065,109
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		365,017		215,350
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		526,825		579,266
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | CLO [Member]
Financial assets held at fair value:
Available for sale investment securities		460,953		429,159
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Single issuer trust preferred securities [Member]
Financial assets held at fair value:
Available for sale investment securities		33,424		37,170
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate debt securities [Member]
Financial assets held at fair value:
Available for sale investment securities		100,961		106,321
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative investments [Member]
Financial assets held at fair value:
Other assets		0		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total financial assets held at fair value		12,146		8,802
Financial liabilities held at fair value:
Contingent liability		6,000		6,000
Total financial liabilities held at fair value		6,000		6,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration [Member]
Financial assets held at fair value:
Other assets		7,655		5,331
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Derivative instruments [Member]
Financial assets held at fair value:
Derivative Asset	[2]			0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage banking derivatives [Member]
Financial assets held at fair value:
Derivative Asset		0		0
Financial liabilities held at fair value:
Derivative liability		0		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Agency CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		0		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | CMBS [Member]
Financial assets held at fair value:
Available for sale investment securities		0		0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative investments [Member]
Financial assets held at fair value:
Other assets		$ 4,491		$ 3,471
[1]	Loans held for sale accounted for under the fair value option of ASC 820 at March 31, 2016. The Company made this policy election on loans originated for sale. See Note 1: Summary of Significant Accounting Policies.
[2]	Asset and liability amounts are prior to the impact of netting derivative assets and derivative liabilities of $1,454 and $4,945, and liability amounts are also prior to offsetting cash collateral paid to the same derivative counterparties of $78,078 and $31,330, at March 31, 2016 and December 31, 2015, respectively, when a legally enforceable master netting agreement exists.

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	3 Months Ended
	Mar. 31, 2016USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	$ 8,802
Level 3, beginning of period, Contingent Liability	6,000
Unrealized (loss) gain included in net income	2,323
Purchases/capital funding	1,021
Level 3, end of period, Financial Assets	12,146
Level 3, end of period, Contingent Liability	6,000
Contingent Consideration [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	5,331
Unrealized (loss) gain included in net income	2,324
Level 3, end of period, Financial Assets	7,655
Equity Method Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	3,471
Unrealized (loss) gain included in net income	(1)
Purchases/capital funding	1,021
Level 3, end of period, Financial Assets	$ 4,491

Fair Value Measurements Schedul

Fair Value Measurements Schedule of Servicing Assets at Fair Value (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 33,568	$ 28,690
Originations of servicing assets	1,913	1,463
Due to payoffs/paydowns	(1,575)	(736)
Due to market changes	190	(1,516)
Ending balance	$ 34,096	$ 27,901

Fair Value Measurements (Sche90

Fair Value Measurements (Schedule Of Valuation Methodology And Unobservable Inputs) (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	$ 420
Other Real Estate Owned [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	8.00%
Other Real Estate Owned [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	20.00%
Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgage servicing assets	$ 34,096
Mortgage Servicing Rights [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	1.30%
Mortgage Servicing Rights [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	2.80%
Impaired Loans and Leases [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Collateral dependent impaired loans and leases	$ 10,202
Impaired Loans and Leases [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	0.00%
Impaired Loans and Leases [Member] | Minimum [Member] | Market Approach Valuation Technique - Discount for cost to sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	6.00%
Impaired Loans and Leases [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	15.00%
Impaired Loans and Leases [Member] | Maximum [Member] | Market Approach Valuation Technique - Discount for cost to sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (as a percent)	20.00%
Interest Rate Risk [Member] | Mortgage Servicing Rights [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate (as a percent)	7.90%
Interest Rate Risk [Member] | Mortgage Servicing Rights [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate (as a percent)	35.20%

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Originated loans held for sale		$ 27,273	$ 0
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Originated loans held for sale	[1]	3,152		$ 37,091
Loans and leases, net		15,684,154		15,496,745
Securities sold under agreements to repurchase and other borrowings		910,149		1,151,400
FHLB advances		2,363,131		2,664,139
Long-term debt		225,323		226,356
Held-to-maturity Securities [Member] | Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		4,012,289		3,923,052
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Originated loans held for sale	[1]	3,152		37,457
Securities sold under agreements to repurchase and other borrowings		925,890		1,163,974
FHLB advances		2,350,887		2,647,872
Long-term debt		218,944		218,143
Significant Other Observable Inputs (Level 2) [Member] | Held-to-maturity Securities [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		4,094,506		3,961,534
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net		15,740,120		15,543,892
Residential Mortgage [Member] | Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount		21,026		20,698
Residential Mortgage [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Fair value		34,096		33,568
Alternative investments [Member] | Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments		12,909		12,900
Alternative investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Alternative investments		13,936		14,294
Deposits Liabilities, other than time deposits [Member] | Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		16,695,458		15,866,624
Deposits Liabilities, other than time deposits [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		16,695,458		15,866,624
Time Deposits [Member] | Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		2,029,065		2,086,154
Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		$ 2,051,672		$ 2,095,357
[1]	Loans held for sale accounted for at the lower of cost or market includes commercial loans at March 31, 2016 and both commercial and residential loans at December 31, 2015.

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 10
Interest cost on benefit obligations	2,098	1,989
Expected return on plan assets	(2,565)	(2,963)
Amortization of prior service cost	0	0
Recognized net loss	1,690	1,427
Net periodic benefit cost	1,235	463
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost on benefit obligations	97	86
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Recognized net loss	130	80
Net periodic benefit cost	227	166
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost on benefit obligations	31	31
Expected return on plan assets	0	0
Amortization of prior service cost	4	18
Recognized net loss	9	12
Net periodic benefit cost	$ 44	$ 61

Share-Based Plans (Summary of S

Share-Based Plans (Summary of Stock-based compensation expense recognized) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation expense	$ 2,783	$ 2,282
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation expense	43	164
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation expense	$ 2,740	$ 2,118

Share-Based Plans (Summary of R

Share-Based Plans (Summary of Restricted Stock and Stock Option Activity) (Detail)	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,504,575
Restricted Stock 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)	236,146
Restricted stock, Granted (in shares)	194,754
Restricted stock, Vested restricted stock awards (in shares)	54,413	[1]
Restricted stock, Forfeited (in shares)	1,204
Restricted stock, Outstanding at end of period (in shares)	375,283
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) | $ / shares	$ 32.58
Restricted stock, Granted (in dollars per share) | $ / shares	33.02
Restricted stock, Vested restricted stock awards (in dollars per share) | $ / shares	30.65	[1]
Restricted stock, Forfeited (in dollars per share) | $ / shares	30.04
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 33.09
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)	2,088
Restricted stock, Granted (in shares)	12,946
Restricted stock, Vested restricted stock awards (in shares)	3,166	[1]
Restricted stock, Forfeited (in shares)	0
Restricted stock, Outstanding at end of period (in shares)	11,868
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) | $ / shares	$ 34.45
Restricted stock, Granted (in dollars per share) | $ / shares	32.89
Restricted stock, Vested restricted stock awards (in dollars per share) | $ / shares	33.92	[1]
Restricted stock, Forfeited (in dollars per share) | $ / shares	0
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 32.89
Performance-Based Restricted Stock Awards 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)	115,721
Restricted stock, Granted (in shares)	150,392
Restricted stock, Vested restricted stock awards (in shares)	28,359	[1]
Restricted stock, Forfeited (in shares)	0
Restricted stock, Outstanding at end of period (in shares)	237,754
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) | $ / shares	$ 34.14
Restricted stock, Granted (in dollars per share) | $ / shares	32.75
Restricted stock, Vested restricted stock awards (in dollars per share) | $ / shares	33.77	[1]
Restricted stock, Forfeited (in dollars per share) | $ / shares	0
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 33.30
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	1,527,074
Options granted, Number of Shares	0
Exercised options, Number of Shares	22,499
Options forfeited, Number of Shares	0
Options outstanding, at end of period, Number of Shares	1,504,575
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) | $ / shares	$ 23.92
Options granted, Weighted-Average Exercise Price (in dollars per share) | $ / shares	0
Options exercised, Weighted-Average Exercise Price (in dollars per share) | $ / shares	13.36
Options forfeited, Weighted-Average Exercise Price (in dollars per share) | $ / shares	0
Options, at end of period, Weighted-average Exercise Price (in dollars per share) | $ / shares	$ 24.08
[1]	Vested for purposes of recording compensation expense.

Share-Based Plans (Narrative) (

Share-Based Plans (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 20.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 3 days
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	100,000
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
Performance-Based Restricted Stock Awards Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Vesting range (as a percent)	50.00%
Performance-Based Restricted Stock Awards Shares [Member] | Minimum [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting range (as a percent)	0.00%
Performance-Based Restricted Stock Awards Shares [Member] | Maximum [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting range (as a percent)	150.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term (in years)	10 years
Number of options outstanding (in shares)	1,504,575	1,527,074
Non-Qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	1,362,567
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	142,008

Segment Reporting (Operating Re

Segment Reporting (Operating Results and Total Assets Reportable Segments) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)Segment	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	4
Net interest income (loss)	$ 176,152	$ 159,764
Provision (benefit) for loan and lease losses	15,600	9,750
Net interest income after provision for loan and lease losses	160,552	150,014
Non-interest income	64,024	57,890
Non-interest expense	151,742	134,090
Income before income tax expense	72,834	73,814
Income tax expense (benefit)	24,217	24,092
Net income	48,617	49,722
Total Assets	24,935,509		$ 24,642,887
Operating Segments [Member] | Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	65,422	61,578
Provision (benefit) for loan and lease losses	10,248	3,374
Net interest income after provision for loan and lease losses	55,174	58,204
Non-interest income	8,783	9,525
Non-interest expense	28,689	26,469
Income before income tax expense	35,268	41,260
Income tax expense (benefit)	11,727	13,467
Net income	23,541	27,793
Total Assets	7,641,618		7,505,513
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	90,056	84,239
Provision (benefit) for loan and lease losses	6,244	6,421
Net interest income after provision for loan and lease losses	83,812	77,818
Non-interest income	26,640	25,540
Non-interest expense	90,876	81,690
Income before income tax expense	19,576	21,668
Income tax expense (benefit)	6,509	7,073
Net income	13,067	14,595
Total Assets	8,471,644		8,441,950
Operating Segments [Member] | HSA Bank [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	19,919	16,465
Provision (benefit) for loan and lease losses	0	0
Net interest income after provision for loan and lease losses	19,919	16,465
Non-interest income	21,605	15,151
Non-interest expense	23,554	18,958
Income before income tax expense	17,970	12,658
Income tax expense (benefit)	5,975	4,131
Net income	11,995	8,527
Total Assets	102,106		95,815
Operating Segments [Member] | Private Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	2,873	2,395
Provision (benefit) for loan and lease losses	29	(57)
Net interest income after provision for loan and lease losses	2,844	2,452
Non-interest income	2,365	2,326
Non-interest expense	5,371	4,879
Income before income tax expense	(162)	(101)
Income tax expense (benefit)	(54)	(33)
Net income	(108)	(68)
Total Assets	504,911		493,571
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Net interest income (loss)	(2,118)	(4,913)
Provision (benefit) for loan and lease losses	(921)	12
Net interest income after provision for loan and lease losses	(1,197)	(4,925)
Non-interest income	4,631	5,348
Non-interest expense	3,252	2,094
Income before income tax expense	182	(1,671)
Income tax expense (benefit)	60	(546)
Net income	122	$ (1,125)
Total Assets	$ 8,215,230		$ 8,106,038

Commitments and Contingencies97

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 5,222,446	$ 5,031,030
Standby letter of credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	124,150	133,294
Letter of Credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	47,762	45,742
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 5,050,534	$ 4,851,994

Commitments and Contingencies -

Commitments and Contingencies - Reserve for Unfunded Commitments (Detail) - Reserve for Off-balance Sheet Activities [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 2,119	$ 5,151
Provision (benefit)	7	(2,831)
Ending balance	$ 2,126	$ 2,320