Webster Financial (WBS) 10-Q 5 Aug 19 2019 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Entity File Number	001-31486
Entity Registrant Name	WEBSTER FINANCIAL CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-1187536
Entity Address, Address Line One	145 Bank Street
Entity Address, City or Town	Waterbury
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06702
City Area Code	203
Local Phone Number	578-2202
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		92,160,144
Entity Central Index Key	0000801337
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
NEW YORK STOCK EXCHANGE, INC. [Member] | Common Class A [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	WBS
Security Exchange Name	NYSE
NEW YORK STOCK EXCHANGE, INC. [Member] | Series F Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Depository Shares, each representing 1/1000th interest in a share
Trading Symbol	WBS-F
Security Exchange Name	NYSE

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cash and Due from Banks	$ 190,828	$ 260,422
Assets:
Interest-bearing deposits	26,652	69,077
Fair Value	2,978,657	2,898,730
Debt Securities, Held-to-maturity	4,636,707	4,325,420
Federal Home Loan Bank and Federal Reserve Bank stock	118,371	149,286
Loans held for sale (valued under fair value option $19,249 and $7,908)	19,249	11,869
Loans and leases	19,269,883	18,465,489
Allowance for loan and lease losses	(211,671)	(212,353)
Loans and leases, net	19,058,212	18,253,136
Deferred tax assets, net	73,462	96,516
Premises and equipment, net	278,227	124,850
Goodwill	538,373	538,373
Other intangible assets, net	23,841	25,764
Cash surrender value of life insurance policies	546,963	543,616
Accrued interest receivable and other assets	452,501	313,256
Total assets	28,942,043	27,610,315
Liabilities and shareholders' equity:
Noninterest-bearing Deposit Liabilities	4,174,806	4,162,446
Interest-bearing Deposit Liabilities	18,423,972	17,696,399
Total deposits	22,598,778	21,858,845
Securities sold under agreements to repurchase and other borrowings	956,920	581,874
Federal Home Loan Bank advances	1,426,656	1,826,808
Long-term debt	538,379	226,021
Accrued expenses and other liabilities	356,093	230,252
Total liabilities	25,876,826	24,723,800
Shareholders’ equity:
Common stock, $.01 par value: Authorized - 200,000,000 shares: Issued (93,651,601 shares)	937	937
Paid-in capital	1,113,893	1,114,394
Retained earnings	1,955,933	1,828,303
Treasury stock, at cost (1,678,893 and 1,508,456 shares)	(84,393)	(71,504)
Accumulated other comprehensive loss, net of tax	(66,190)	(130,652)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,065,217	2,886,515
Total liabilities and shareholders' equity	28,942,043	27,610,315
Series F Preferred Stock [Member]
Shareholders’ equity:
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series E issued and outstanding (5,060 shares)	$ 145,037	$ 145,037

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities held-to-maturity ,fair value	$ 4,674,510	$ 4,209,121
Loans Held-for-sale, Fair Value Disclosure	$ 19,249	$ 7,908
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	6,000	5,060
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)	93,686,311	93,686,311
Treasury stock ,shares (in shares)	1,678,893	1,508,456

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest Income:
Interest and fees on loans and leases	$ 235,949	$ 207,820	$ 464,713	$ 401,040
Taxable interest and dividends on investments	50,634	47,427	102,510	94,715
Non-taxable interest on investment securities	5,529	5,096	10,931	10,367
Loans held for sale	145	148	293	290
Total interest income	292,257	260,491	578,447	506,412
Interest Expense:
Deposits	32,757	20,225	63,777	38,381
Securities sold under agreements to repurchase and other borrowings	3,904	3,998	6,656	7,638
Federal Home Loan Bank advances	7,772	8,471	15,557	15,752
Long-term debt	6,037	2,787	9,119	5,463
Total interest expense	50,470	35,481	95,109	67,234
Net interest income	241,787	225,010	483,338	439,178
Provision for loan and lease losses	11,900	10,500	20,500	21,500
Net interest income after provision for loan and lease losses	229,887	214,510	462,838	417,678
Non-interest Income:
Deposit service fees	43,118	40,859	86,142	81,310
Loan and lease related fees	6,558	6,333	14,377	13,329
Wealth and investment services	8,309	8,456	15,960	16,326
Mortgage banking activities	932	1,235	1,696	2,379
Increase in cash surrender value of life insurance policies	3,650	3,643	7,234	7,215
Other income			19,056	16,562
Noninterest Income, Other	13,286	7,848
Total non-interest income	75,853	68,374	144,465	137,121
Non-interest Expense:
Compensation and benefits	98,527	93,052	196,312	187,817
Occupancy	14,019	15,842	28,715	30,987
Technology and equipment	25,767	24,604	51,464	48,466
Intangible assets amortization	962	962	1,924	1,924
Marketing	4,243	4,889	7,571	8,441
Professional and outside services	5,634	4,381	11,682	9,169
Deposit insurance	4,453	13,687	8,883	20,404
Other expense	27,035	23,042	49,775	44,866
Total non-interest expense	180,640	180,459	356,326	352,074
Income (loss) before income tax expense	125,100	102,425	250,977	202,725
Income tax expense	26,451	20,743	52,592	40,818
Net income	98,649	81,682	198,385	161,907
Preferred stock dividends and other	(2,456)	(2,193)	(4,902)	(4,334)
Earnings applicable to common shareholders	$ 96,193	$ 79,489	$ 193,483	$ 157,573
Earnings per common share:
Basic (in dollars per share)	$ 1.05	$ 0.87	$ 2.11	$ 1.71
Diluted (in dollars per share)	$ 1.05	$ 0.86	$ 2.11	$ 1.71

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 98,649	$ 81,682	$ 198,385	$ 161,907
Other comprehensive income (loss), net of tax:
Investment securities available-for-sale	34,409	(9,246)	61,968	(36,670)
Derivative instruments	186	1,680	382	4,202
Defined benefit pension and other postretirement benefit plans	1,056	1,109	2,112	2,063
Other comprehensive income (loss), net of tax	35,651	(6,457)	64,462	(30,405)
Comprehensive income	$ 134,300	$ 75,225	$ 262,847	$ 131,502

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Series E Preferred Stock [Member]	Series F Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Series E Preferred Stock [Member]	Retained Earnings [Member]Series F Preferred Stock [Member]	Treasury Stock, at cost [Member]	AOCI Attributable to Parent [Member]
Beginning Balance at Dec. 31, 2017	$ 2,701,958			$ 145,056	$ 937	$ 1,122,164	$ 1,595,762			$ (70,430)	$ (91,531)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	161,907						161,907
Other comprehensive income, net of tax	(30,405)										(30,405)
Dividends and dividend equivalents declared on common stock	(54,179)					99	(54,278)
Dividends on preferred stock		$ (3,938)						$ (3,938)
Stockholders' Equity, Other			$ 22						$ 22
Stock-based compensation	5,879					(1,541)	1,654			5,766
Exercise of stock options	2,110					(5,308)				7,418
Common shares acquired from stock compensation plan activity	(8,092)									(8,092)
Common stock repurchase program	(12,158)									(12,158)
Stock Issued During Period, Value, Other			(19)
Ending Balance at Jun. 30, 2018	2,761,723			145,037	937	1,115,414	1,699,767			(77,496)	(121,936)
Beginning Balance at Mar. 31, 2018	2,716,142			145,037	937	1,120,522	1,649,524			(84,399)	(115,479)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	81,682						81,682
Other comprehensive income, net of tax	(6,457)										(6,457)
Dividends and dividend equivalents declared on common stock	(30,111)					56	(30,167)
Dividends on preferred stock		$ (1,969)						$ (1,969)
Stockholders' Equity, Other			0						0
Stock-based compensation	2,544						697			1,847
Exercise of stock options	1,820					(5,164)				6,984
Common shares acquired from stock compensation plan activity	(1,928)									(1,928)
Common stock repurchase program	0									0
Stock Issued During Period, Value, Other			0
Ending Balance at Jun. 30, 2018	2,761,723			145,037	937	1,115,414	1,699,767			(77,496)	(121,936)
Cumulative Effect of New Accounting Principle in Period of Adoption	(1,362)						(1,362)
Beginning Balance at Dec. 31, 2018	2,886,515			145,037	937	1,114,394	1,828,303			(71,504)	(130,652)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	198,385						198,385
Other comprehensive income, net of tax	64,462										64,462
Dividends and dividend equivalents declared on common stock	(67,481)						(67,481)
Dividends on preferred stock			(3,938)						(3,938)
Stock-based compensation	6,416					1,528	1,179			3,709
Exercise of stock options	621					(2,029)				2,650
Common shares acquired from stock compensation plan activity	(6,245)									(6,245)
Common stock repurchase program	(13,003)									(13,003)
Ending Balance at Jun. 30, 2019	3,065,217			145,037	937	1,113,893	1,955,933			(84,393)	(66,190)
Beginning Balance at Mar. 31, 2019	2,966,255			145,037	937	1,113,107	1,895,870			(86,855)	(101,841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	98,649						98,649
Other comprehensive income, net of tax	35,651										35,651
Dividends and dividend equivalents declared on common stock	(36,892)						(36,892)
Dividends on preferred stock			$ (1,969)						$ (1,969)
Stock-based compensation	3,440					1,528	275			1,637
Exercise of stock options	217					(742)	0			959
Common shares acquired from stock compensation plan activity	(134)									(134)
Common stock repurchase program	0									0
Ending Balance at Jun. 30, 2019	3,065,217			$ 145,037	$ 937	$ 1,113,893	1,955,933			$ (84,393)	$ (66,190)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (515)						$ (515)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Dividends on common stock and dividend equivalents declared (in dollars per share)	$ 0.73	$ 0.59
Series E Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)		$ 667.1875
Series F Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)	$ 656.25

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities:
Net income	$ 198,385	$ 161,907
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	20,500	21,500
Deferred tax expense (benefit)	514	(4,247)
Depreciation and amortization	18,884	19,187
Amortization of premium/discount on earning assets and funding, net	22,785	26,625
Stock-based compensation	6,416	5,879
Gain on sale, net of write-down, on foreclosed and repossessed assets	(635)	(291)
Loss on sale, net of write-down, on premises and equipment	482	253
Increase in cash surrender value of life insurance policies	(7,234)	(7,215)
Gain from life insurance policies	(3,412)	(825)
Mortgage banking activities	(1,696)	(2,379)
Proceeds from sale of loans held for sale	63,464	90,063
Origination of loans held for sale	(74,076)	(86,694)
Net increase in right-of-use lease assets	(888)	0
Net (increase) decrease in derivative contract assets net of liabilities	(115,498)	65,421
Net increase in accrued interest receivable and other assets	(28,485)	(9,482)
Net decrease in accrued expenses and other liabilities	(1,545)	(23,176)
Net cash provided by operating activities	97,961	256,526
Investing Activities:
Purchases of available for sale investment securities	(255,885)	(455,042)
Proceeds from maturities and principal payments of available for sale investment securities	251,957	256,179
Purchases of held-to-maturity investment securities	(567,118)	(157,061)
Proceeds from maturities and principal payments of held-to-maturity investment securities	242,511	271,195
Net proceeds from Federal Home Loan Bank stock	30,915	10,273
Alternative investments capital call, net	(3,316)	(246)
Net increase in loans	(847,143)	(523,631)
Proceeds from loans not originated for sale	20,012	34
Proceeds from life insurance policies	2,270	2,429
Proceeds from the sale of foreclosed and repossessed assets	8,191	3,801
Additions to premises and equipment	(12,698)	(16,063)
Net cash used for investing activities (1)	(1,130,304)	(608,132)
Financing Activities:
Net increase in deposits	738,802	351,004
Proceeds from Federal Home Loan Bank advances	3,700,000	4,000,000
Repayments of Federal Home Loan Bank advances	(4,100,152)	(4,100,149)
Net decrease in securities sold under agreements to repurchase and other borrowings	375,046	219,299
Issuance of long-term debt	300,000	0
Debt issuance costs	(3,642)	0
Dividends paid to common shareholders	(67,165)	(53,974)
Dividends paid to preferred shareholders	(3,938)	(3,938)
Exercise of stock options	621	2,110
Common stock repurchase program	(13,003)	(12,158)
Common shares purchased related to stock compensation plan activity	(6,245)	(8,092)
Net cash (used for) provided by financing activities	920,324	394,102
Net decrease in cash and due from banks	(112,019)	42,496
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Beginning of Period	329,499	256,786
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents End of Period	217,480	299,282
Supplemental disclosure of cash flow information:
Interest paid	87,129	64,009
Income taxes paid	69,759	47,781
Noncash investing and financing activities:
Real Estate Owned, Transfer to Real Estate Owned	5,880	3,406
Transfer of loans from portfolio to loans-held-for-sale	15,438	35
Operating Lease, Right-of-Use Asset	158,270	0
Operating Lease, Liability	$ 178,724	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Nature of Operations Webster Financial Corporation (the Holding Company) is a bank holding company and financial holding company under the Bank Holding Company Act, incorporated under the laws of Delaware in 1986 and headquartered in Waterbury, Connecticut. The Holding Company's principal asset is all of the outstanding capital stock of Webster Bank, National Association (Webster Bank). Webster delivers financial services to individuals, families, and businesses primarily within its regional footprint from New York to Massachusetts. Webster provides business and consumer banking, mortgage lending, financial planning, trust, and investment services through banking offices, ATMs, 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 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 related Notes, for the year ended December 31, 2018 , included in our Form 10-K filed with the SEC. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on the Company's consolidated financial statements. Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as well as income and expense during the reporting 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. Accounting Standards Adopted During 2019 Effective January 1, 2019 , the following ASUs were adopted by the Company: ASU No. 2018-16, Derivatives and Hedging (Topic 815) - Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. The Update permits the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the interest rates on direct U.S. Treasury obligations, the London Interbank Offered Rate swap rate, the OIS rate based on the Fed Funds Effective Rate, and the Securities Industry and Financial Markets Association Municipal Swap Rate. The Company adopted the Update during the first quarter of 2019 on a prospective basis. The adoption of this guidance did not have a material effect on the Company's consolidated financial statements. ASU No. 2017-12, Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities. The purpose of the Update is to better align a company’s risk management and financial reporting for hedging activities with the economic objectives of those activities. The Update expands an entity's ability to hedge non-financial and financial risk components and reduce complexity in hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness, and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line in which the earnings effect of the hedged item is reported. The Company adopted the Update during the first quarter of 2019 on a modified retrospective basis. The adoption of this guidance did not have a material effect on the Company's consolidated financial statements. The Company has provided enhanced disclosures in Note 13: Derivative Financial Instruments as a result of adopting this Update. ASU No. 2016-02, Leases (Topic 842) and subsequent ASUs issued to amend this Topic. The Updates introduce a lessee model that requires substantially all leases to be recorded as assets and liabilities on the balance sheet and requires expanded quantitative and qualitative disclosures regarding key information about leasing arrangements. The lessor model remains substantially the same with targeted improvements that do not materially impact the Company. The Company adopted the Updates during the first quarter of 2019 using the new transition method option that allows the use of effective date, January 1, 2019, as the date of initial application of the new lease accounting standard and to recognize a cumulative-effect adjustment to the opening balance of retained earnings upon adoption. The Company elected the transition relief package of practical expedients which forgoes the requirement to reassess the existence of leases in existing contracts, their lease classification and the accounting treatment of their initial direct costs. As a practical expedient, the Company has also made a policy election to not separate non-lease components from lease components for its real estate leases and instead account for each separate lease components and non-lease components associated with that lease component as a single lease component. The Company will separately account for the lease and non-lease components in its equipment leases. The Company determines whether a contract contains a lease based on whether a contract, or a part of a contract, conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The discount rate used is either the rate implicit in the lease, or when a rate cannot be readily determined an incremental borrowing rate. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term and amount equal to the lease payments, in a similar economic environment. As a result of adopting this Update, the Company recognized $157.2 million of right-of-use asset (ROU) and $178.2 million of lease liability, as of January 1, 2019. The Company also recorded a $0.5 million cumulative-effect adjustment directly to retained earnings as of January 1, 2019 for abandoned leased properties and the remaining deferred gains on sale-leaseback transactions which occurred prior to the date of adoption. See Note 9: Leasing for further information. Accounting Standards Issued But Not Yet Adopted The following list identifies ASUs applicable to the Company that have been issued by the Financial Accounting Standards Board (FASB) but are not yet effective: ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. The Update amends guidance on credit losses, hedge accounting, and recognition and measurement of financial instruments. The changes provide clarifications and codification improvements in relation to recently issued accounting updates. The amendments to the guidance on credit losses are considered in the paragraphs below related to our adoption of ASU 2016-13, and will be adopted concurrently with those Updates. The clarifications and amendments to the guidance on hedge accounting and recognition and measurement of financial instruments will be effective for the Company on January 1, 2020. The Company does not expect these changes to have a material impact on its consolidated financial statements. ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The Update aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The updated guidance also requires an entity to amortize the capitalized implementation costs as an expense over the term of the hosting arrangement and to present in the same income statement line item as the fees associated with the hosting arrangement. The Update is effective for the Company on January 1, 2020. Early adoption is permitted, although the Company does not intend to early adopt. The Company will apply the amendments in this update prospectively to all implementation costs incurred after the date of adoption. The Company does not expect this Update to have a material impact on its consolidated financial statements. ASU No. 2018-14, Compensation-Retirement Benefits - Defined Benefit Plan - General (Subtopic 715-20) - Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. The Update modifies the disclosure requirements for employers that sponsor defined benefit pension plans and other postretirement plans. The updated guidance will be effective for the Company on January 1, 2021. The Company does not expect this Update to have a material impact on its consolidated financial statements. ASU No. 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The Update modifies the disclosure requirements on fair value measurements. The updated guidance will no longer require entities to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. However, it will require public companies to disclose changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 measurements. The Update is effective for the Company on January 1, 2020, and earlier adoption is permitted. The Company does not expect this Update to have a material impact on its consolidated financial statements. ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment. The Update simplifies quantitative goodwill impairment testing by requiring entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit's fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. This changes current guidance by eliminating the second step of the goodwill impairment analysis which involves calculating the implied fair value of goodwill determined in the same manner as the amount of goodwill recognized in a business combination upon acquisition. Entities will still have the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The Update must be applied prospectively and is effective for the Company on January 1, 2020. Early adoption is permitted. The Company does not expect this new guidance to have a material impact on its consolidated financial statements. ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments and subsequent ASUs issued to clarify this Topic. Current GAAP requires an incurred loss methodology for recognizing credit losses. This approach requires recognition of credit losses when it is probable a loss has been incurred. The main objective of this Update is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this Update will replace today's incurred loss approach with a new credit loss methodology known as the Current Expected Credit Loss (CECL) model which requires earlier recognition of credit losses using a lifetime credit loss measurement approach for financial assets carried at amortized cost. The CECL model requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. The change from an incurred loss method to an expected loss method represents a fundamental shift from existing GAAP and may result in a material increase to the Company's accounting for credit losses on financial instruments. To prepare for implementation of the new standard the Company has established a project lead and has empowered a steering committee comprised of members from different disciplines including Credit, Accounting, Finance, IT, and Treasury, as well as specific working groups to focus on key components of the development process. Through these working groups, the Company has begun to evaluate the effect that this Update, including the subsequent ASUs issued to clarify this Topic, will have on its financial statements and related disclosures. An implementation project plan has been created and is made up of targeted work streams focused on credit models, data management, treasury, and accounting. These work streams are collectively assessing required resources, use of existing and new models, and data availability. The new credit models will include additional assumptions used to calculate credit losses over the estimated life of the financial assets and will include the impact of forecasted macroeconomic conditions. The Company has contracted with system solution providers and is in the process of implementing the selected solutions. During 2019, the Company is focused on model validations as well as the development of processes and related controls. The Company will conduct a parallel run in the second half of 2019.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities The Company has an investment interest in the following entities that meet the definition of a variable interest entity (VIE). Consolidated Rabbi Trust. The Company established a Rabbi Trust to meet the obligations due under its Deferred Compensation Plan for Directors and Officers and to mitigate the expense volatility of the aforementioned plan. The funding of the Rabbi Trust and the discontinuation of the Deferred Compensation Plan for Directors and Officers occurred during 2012. Invested assets 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 activities of the Rabbi Trust that significantly affect the VIE's economic performance 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 consolidated balance sheet. 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 consolidated income statement. See Note 14: 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 Webster is not the manager. The investment securities consist of Agency CMO, Agency MBS, Agency CMBS, CMBS, and CLO. The Company has not provided financial or other support with respect to these investment securities other than its original investment. For these investment securities, the Company determined it is not the primary beneficiary due to the relative size of its 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 its inability to direct the activities that most significantly impact the economic performance of the VIEs. The Company’s maximum exposure to loss is limited to the amount of its investment in the VIEs. See Note 3: Investment Securities for additional information. Tax Credit - Finance Investments. The Company makes non-marketable 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. The Company applies the proportional amortization method to account for its investments in qualified affordable housing projects. At June 30, 2019 and December 31, 2018 , the aggregate carrying value of the Company's tax credit-finance investments was $37.8 million and $29.1 million , respectively, which represents the Company's maximum exposure to loss. At June 30, 2019 and December 31, 2018 , unfunded commitments have been recognized, totaling $15.0 million and $10.4 million , respectively, and are included in accrued expenses and other liabilities in the consolidated balance sheet. Webster Statutory Trust. The Company owns all the outstanding common stock of Webster Statutory Trust, a financial vehicle that has issued, and in the future may issue, trust preferred securities. The trust is a VIE in which the Company is not the primary beneficiary. 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 in the consolidated balance sheet, and the related interest expense is reported as interest expense on long-term debt in the consolidated income statement. Other Non-Marketable Investments. The Company invests in various alternative investments in which it holds a variable interest. These investments are non-public entities which cannot be redeemed since the Company’s investment is distributed as the underlying equity is 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 impact the economic performance of the VIEs. At June 30, 2019 and December 31, 2018 , the aggregate carrying value of the Company's other investments in VIEs was $20.9 million and $17.6 million , respectively, and the total exposure of the Company's other investments in VIEs, including unfunded commitments, was $35.5 million and $31.0 million , respectively. Refer to Note 14: Fair Value Measurements for additional information. The Company's equity interests in Tax Credit-Finance Investments, Webster Statutory Trust, and Other Non-Marketable Investments are included in accrued interest receivable and other assets in the consolidated balance sheet. For a description of the Company's accounting policy regarding the consolidation of VIEs, refer to Note 1 to the Consolidated Financial Statements included in its Form 10-K, for the year ended December 31, 2018 .

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 At December 31, 2018 (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 $ 9,997 $ 1 $ — $ 9,998 $ 7,549 $ 1 $ — $ 7,550 Agency CMO 213,307 2,209 (1,264 ) 214,252 238,968 412 (4,457 ) 234,923 Agency MBS 1,612,028 19,109 (11,665 ) 1,619,472 1,521,534 1,631 (42,076 ) 1,481,089 Agency CMBS 594,548 175 (16,022 ) 578,701 608,167 — (41,930 ) 566,237 CMBS 428,492 599 (23 ) 429,068 447,897 645 (2,961 ) 445,581 CLO 96,727 106 (444 ) 96,389 114,641 94 (1,964 ) 112,771 Corporate debt 35,551 — (4,774 ) 30,777 55,860 — (5,281 ) 50,579 Available-for-sale $ 2,990,650 $ 22,199 $ (34,192 ) $ 2,978,657 $ 2,994,616 $ 2,783 $ (98,669 ) $ 2,898,730 Held-to-maturity: Agency CMO $ 190,858 $ 1,089 $ (1,406 ) $ 190,541 $ 208,113 $ 287 $ (5,255 ) $ 203,145 Agency MBS 2,736,676 33,098 (20,616 ) 2,749,158 2,517,823 8,250 (79,701 ) 2,446,372 Agency CMBS 768,076 3,988 (3,684 ) 768,380 667,500 53 (22,572 ) 644,981 Municipal bonds and notes 746,345 23,473 (651 ) 769,167 715,041 2,907 (18,285 ) 699,663 CMBS 194,752 2,549 (37 ) 197,264 216,943 405 (2,388 ) 214,960 Held-to-maturity $ 4,636,707 $ 64,197 $ (26,394 ) $ 4,674,510 $ 4,325,420 $ 11,902 $ (128,201 ) $ 4,209,121 Other-Than-Temporary Impairment The amount in the amortized cost columns in the table above includes other-than-temporary impairment (OTTI) related to certain CLO positions that were previously considered Covered Funds as defined by Section 619 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010. The Company has taken measures to bring its CLO positions into conformance with these requirements. The following table presents activity for OTTI: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 822 $ 1,364 $ 822 $ 1,364 Reduction for investment securities called — (261 ) — (261 ) Ending balance $ 822 $ 1,103 $ 822 $ 1,103 To the extent that changes occur in interest rates, credit movements, or other factors that impact fair value and expected recovery of amortized cost of its investment securities, the Company may, in future periods, be required to recognize OTTI in earnings. Fair Value and Unrealized Losses The following tables provide information on fair value and unrealized losses for the individual investment securities with an unrealized loss, aggregated by classification and length of time that the individual investment securities have been in a continuous unrealized loss position: At June 30, 2019 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 $ 6 $ — $ 83,924 $ (1,264 ) 11 $ 83,930 $ (1,264 ) Agency MBS — — 748,498 (11,665 ) 123 748,498 (11,665 ) Agency CMBS — — 542,244 (16,022 ) 34 542,244 (16,022 ) CMBS 45,740 (22 ) 17,000 (1 ) 10 62,740 (23 ) CLO 18,380 (320 ) 24,875 (124 ) 2 43,255 (444 ) Corporate debt 7,686 (862 ) 23,091 (3,912 ) 7 30,777 (4,774 ) Available-for-sale in an unrealized loss position $ 71,812 $ (1,204 ) $ 1,439,632 $ (32,988 ) 187 $ 1,511,444 $ (34,192 ) Held-to-maturity: Agency CMO $ 210 $ — $ 84,453 $ (1,406 ) 11 $ 84,663 $ (1,406 ) Agency MBS — — 1,268,211 (20,616 ) 166 1,268,211 (20,616 ) Agency CMBS — — 536,755 (3,684 ) 44 536,755 (3,684 ) Municipal bonds and notes — — 64,069 (651 ) 25 64,069 (651 ) CMBS 3,350 (3 ) 22,386 (34 ) 5 25,736 (37 ) Held-to-maturity in an unrealized loss position $ 3,560 $ (3 ) $ 1,975,874 $ (26,391 ) 251 $ 1,979,434 $ (26,394 ) At December 31, 2018 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 $ 15,524 $ (72 ) $ 180,641 $ (4,385 ) 36 $ 196,165 $ (4,457 ) Agency MBS 321,678 (2,078 ) 975,084 (39,998 ) 184 1,296,762 (42,076 ) Agency CMBS — — 566,237 (41,930 ) 37 566,237 (41,930 ) CMBS 343,457 (2,937 ) 5,193 (24 ) 39 348,650 (2,961 ) CLO 83,305 (1,695 ) 14,873 (269 ) 5 98,178 (1,964 ) Corporate debt 35,990 (1,820 ) 14,589 (3,461 ) 8 50,579 (5,281 ) Available-for-sale in an unrealized loss position $ 799,954 $ (8,602 ) $ 1,756,617 $ (90,067 ) 309 $ 2,556,571 $ (98,669 ) Held-to-maturity: Agency CMO $ 691 $ (1 ) $ 182,396 $ (5,254 ) 25 $ 183,087 $ (5,255 ) Agency MBS 288,635 (1,916 ) 1,892,951 (77,785 ) 272 2,181,586 (79,701 ) Agency CMBS — — 635,284 (22,572 ) 56 635,284 (22,572 ) Municipal bonds and notes 68,351 (882 ) 414,776 (17,403 ) 223 483,127 (18,285 ) CMBS 24,881 (270 ) 132,464 (2,118 ) 20 157,345 (2,388 ) Held-to-maturity in an unrealized loss position $ 382,558 $ (3,069 ) $ 3,257,871 $ (125,132 ) 596 $ 3,640,429 $ (128,201 ) Impairment Analysis The following impairment analysis 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 as of June 30, 2019 . Unless otherwise noted for an investment security type, management does not intend to sell these investment securities and has determined, based upon available evidence, that it is more likely than not that the Company will not be required to sell these investment securities before the recovery of their amortized cost. As such, based on the following impairment analysis, the Company does not consider any of these investment securities, in unrealized loss positions, to be other-than-temporarily impaired at June 30, 2019 . Available-for-Sale Securities Agency CMO. There were unrealized losses of $1.3 million on the Company’s investment in Agency CMO securities issued by government agencies at June 30, 2019 , compared to $4.5 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances decreased for this asset class since December 31, 2018 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or implicit. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Agency MBS. There were unrealized losses of $11.7 million on the Company’s investment in Agency MBS securities issued by government agencies at June 30, 2019 , compared to $42.1 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances increased for this asset class since December 31, 2018 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or implicit. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Agency CMBS. There were unrealized losses of $16.0 million on the Company's investment in Agency Commercial Mortgage-Backed Securities (CMBS) issued by government agencies at June 30, 2019 , compared to $41.9 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances decreased for this asset class since December 31, 2018 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or implicit. There has been no change in the credit quality, and the contractual cash flows are performing as expected. CMBS. There were unrealized losses of $23 thousand on the Company’s investment in CMBS at June 30, 2019 , compared to $3.0 million at December 31, 2018 . Unrealized losses decreased due to reduced market spreads while balances decreased for the portfolio of mainly floating rate CMBS at June 30, 2019 compared to December 31, 2018 . Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. Contractual cash flows for the bonds continue to perform as expected. CLO. There were unrealized losses of $0.4 million on the Company’s investments in CLO at June 30, 2019 compared to $2.0 million unrealized losses at December 31, 2018 . Unrealized losses decreased due to reduced market spreads while principal decreased from December 31, 2018 . Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. Contractual cash flows for the bonds continue to perform as expected. Corporate debt. There were unrealized losses of $4.8 million on the Company's corporate debt portfolio at June 30, 2019 , compared to $5.3 million at December 31, 2018 . Unrealized losses decreased due to reduced market spreads while principal balances decreased since December 31, 2018 . The Company performs periodic credit reviews of the issuer to assess the likelihood for ultimate recovery of amortized cost. Contractual cash flows for the bonds continue to perform as expected. Held-to-Maturity Securities Agency CMO. There were unrealized losses of $1.4 million on the Company’s investment in Agency CMO securities issued by government agencies at June 30, 2019 , compared to $5.3 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances decreased since December 31, 2018 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or implicit. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Agency MBS. There were unrealized losses of $20.6 million on the Company’s investment Agency MBS securities issued by government agencies at June 30, 2019 , compared to $79.7 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances increased for this asset class since December 31, 2018 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or implicit. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Agency CMBS. There were unrealized losses of $3.7 million on the Company’s investment in Agency Commercial Mortgage-Backed Securities (CMBS) issued by government agencies at June 30, 2019 , compared to $22.6 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances increased since December 31, 2018 . These investments are issued by a government or government sponsored agency and therefore, are backed by certain government guarantees, either direct or implicit. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Municipal bonds and notes. There were unrealized losses of $0.7 million on the Company’s investment in municipal bonds and notes at June 30, 2019 , compared to $18.3 million at December 31, 2018 . Unrealized losses decreased due to lower market rates while principal balances increased since December 31, 2018 . The Company performs periodic credit reviews of the issuers and the securities are currently performing as expected. CMBS. There were unrealized losses of $37 thousand on the Company’s investment in CMBS at June 30, 2019 , compared to $2.4 million unrealized losses at December 31, 2018 . Unrealized losses decreased due to lower market rates on mainly seasoned fixed rate conduit transactions while principal balances decreased since December 31, 2018 . Internal stress tests are performed on individual bonds to monitor potential losses under stress scenarios. There has been no change in the credit quality, and the contractual cash flows are performing as expected. Sales of Available-for Sale Investment Securities There were no sales during the three and six months ended June 30, 2019 and 2018 . Contractual Maturities The amortized cost and fair value of debt securities by contractual maturity are set forth below: At June 30, 2019 Available-for-Sale Held-to-Maturity (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 9,997 $ 9,998 $ 2,350 $ 2,357 Due after one year through five years 17,000 17,032 6,812 6,959 Due after five through ten years 308,645 308,548 112,156 115,431 Due after ten years 2,655,008 2,643,079 4,515,389 4,549,763 Total debt securities $ 2,990,650 $ 2,978,657 $ 4,636,707 $ 4,674,510 For the maturity schedule above, mortgage-backed securities and CLO, 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 June 30, 2019 , the Company had a carrying value of $1.2 billion in callable debt securities in its CMBS, CLO, and municipal bond portfolios. The Company considers prepayment risk in the evaluation of its interest rate risk profile. These maturities may change due to calls and prepayments. Investment securities with a carrying value totaling $2.3 billion at June 30, 2019 and $2.2 billion December 31, 2018 were pledged to secure public funds, trust deposits, repurchase agreements, and for other purposes, as required or permitted by law.

Loans and Leases

Loans and Leases	6 Months Ended
	Jun. 30, 2019
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	Loans and Leases The following table summarizes loans and leases: (In thousands) At June 30, At December 31, 2018 Residential $ 4,718,704 $ 4,416,637 Consumer 2,301,291 2,396,704 Commercial 6,519,953 6,216,606 Commercial Real Estate 5,224,382 4,927,145 Equipment Financing 505,553 508,397 Loans and leases (1) (2) $ 19,269,883 $ 18,465,489 (1) Includes net deferred fees and net premiums/discounts of $8.2 million and $13.9 million at June 30, 2019 and December 31, 2018 , respectively. (2) At June 30, 2019 the Company had pledged $6.8 billion of eligible loans as collateral to support borrowing capacity at the Federal Home Loan Bank (FHLB) of Boston and the Federal Reserve Bank (FRB) of Boston. The equipment financing portfolio includes net investment in leases of $164.0 million at June 30, 2019 . Total undiscounted cash flows to be received from the Company's net investment in leases are $178.5 million at June 30, 2019 and are primarily due within the next five years. The Company's lessor portfolio has recognized interest income of $1.5 million and $2.9 million for the three and six months ended June 30, 2019 , respectively. Loans and Leases Aging The following tables summarize the aging of loans and leases: At June 30, 2019 (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 $ 6,922 $ 3,955 $ — $ 48,228 $ 59,105 $ 4,659,599 $ 4,718,704 Consumer: Home equity 7,451 2,574 — 31,870 41,895 2,035,234 2,077,129 Other consumer 2,776 1,180 — 1,190 5,146 219,016 224,162 Commercial: Commercial non-mortgage 1,300 688 410 52,452 54,850 5,387,985 5,442,835 Asset-based — — — 184 184 1,076,934 1,077,118 Commercial real estate: Commercial real estate 1,189 125 — 10,428 11,742 4,957,572 4,969,314 Commercial construction 1,355 — — — 1,355 253,713 255,068 Equipment financing 2,241 219 — 3,949 6,409 499,144 505,553 Total $ 23,234 $ 8,741 $ 410 $ 148,301 $ 180,686 $ 19,089,197 $ 19,269,883 At December 31, 2018 (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 $ 8,513 $ 4,301 $ — $ 49,188 $ 62,002 $ 4,354,635 $ 4,416,637 Consumer: Home equity 9,250 5,385 — 33,495 48,130 2,121,049 2,169,179 Other consumer 1,774 957 — 1,494 4,225 223,300 227,525 Commercial: Commercial non-mortgage 1,011 702 104 55,810 57,627 5,189,808 5,247,435 Asset-based — — — 224 224 968,947 969,171 Commercial real estate: Commercial real estate 1,275 245 — 8,242 9,762 4,698,552 4,708,314 Commercial construction — — — — — 218,831 218,831 Equipment financing 510 405 — 6,314 7,229 501,168 508,397 Total $ 22,333 $ 11,995 $ 104 $ 154,767 $ 189,199 $ 18,276,290 $ 18,465,489 Interest on non-accrual loans and leases that would have been recorded as additional interest income had the loans and leases been current in accordance with the original terms totaled $3.4 million and $2.4 million for the three months ended June 30, 2019 and 2018 , respectively, and $6.1 million and $4.3 million for the six months ended June 30, 2019 and 2018 , respectively. Allowance for Loan and Lease Losses The following tables summarize the activity in, as well as the loan and lease balances that were evaluated for, the ALLL: At or for the three months ended June 30, 2019 Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 20,413 $ 26,919 $ 100,174 $ 58,893 $ 4,990 $ 211,389 Provision (benefit) charged to expense 2,667 1,313 3,391 4,615 (86 ) 11,900 Charge-offs (2,154 ) (4,098 ) (5,218 ) (2,473 ) (439 ) (14,382 ) Recoveries 295 1,972 453 33 11 2,764 Balance, end of period $ 21,221 $ 26,106 $ 98,800 $ 61,068 $ 4,476 $ 211,671 At or for the three months ended June 30, 2018 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 18,777 $ 34,239 $ 95,573 $ 51,436 $ 5,324 $ 205,349 Provision (benefit) charged to expense 659 813 4,490 4,428 110 10,500 Charge-offs (754 ) (4,907 ) (5,632 ) (40 ) (65 ) (11,398 ) Recoveries 325 1,614 909 9 14 2,871 Balance, end of period $ 19,007 $ 31,759 $ 95,340 $ 55,833 $ 5,383 $ 207,322 At or for the six months ended June 30, 2019 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 19,599 $ 28,681 $ 98,793 $ 60,151 $ 5,129 $ 212,353 Provision (benefit) charged to expense 3,554 1,036 11,618 4,324 (32 ) 20,500 Charge-offs (2,405 ) (8,071 ) (12,851 ) (3,446 ) (643 ) (27,416 ) Recoveries 473 4,460 1,240 39 22 6,234 Balance, end of period $ 21,221 $ 26,106 $ 98,800 $ 61,068 $ 4,476 $ 211,671 Individually evaluated for impairment $ 3,969 $ 1,292 $ 8,696 $ 656 $ 168 $ 14,781 Collectively evaluated for impairment $ 17,252 $ 24,814 $ 90,104 $ 60,412 $ 4,308 $ 196,890 Loan and lease balances: Individually evaluated for impairment $ 100,168 $ 37,332 $ 97,919 $ 13,879 $ 3,949 $ 253,247 Collectively evaluated for impairment 4,618,536 2,263,959 6,422,034 5,210,503 501,604 19,016,636 Loans and leases $ 4,718,704 $ 2,301,291 $ 6,519,953 $ 5,224,382 $ 505,553 $ 19,269,883 At or for the six months ended June 30, 2018 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 19,058 $ 36,190 $ 89,533 $ 49,407 $ 5,806 $ 199,994 Provision (benefit) charged to expense 909 2,493 11,910 6,532 (344 ) 21,500 Charge-offs (1,671 ) (9,981 ) (7,129 ) (117 ) (110 ) (19,008 ) Recoveries 711 3,057 1,026 11 31 4,836 Balance, end of period $ 19,007 $ 31,759 $ 95,340 $ 55,833 $ 5,383 $ 207,322 Individually evaluated for impairment $ 4,330 $ 1,498 $ 6,007 $ 2,061 $ 18 $ 13,914 Collectively evaluated for impairment $ 14,677 $ 30,261 $ 89,333 $ 53,772 $ 5,365 $ 193,408 Loan and lease balances: Individually evaluated for impairment $ 109,636 $ 41,636 $ 87,071 $ 12,677 $ 6,185 $ 257,205 Collectively evaluated for impairment 4,345,944 2,444,059 5,894,485 4,567,523 516,780 17,768,791 Loans and leases $ 4,455,580 $ 2,485,695 $ 5,981,556 $ 4,580,200 $ 522,965 $ 18,025,996 Impaired Loans and Leases The following tables summarize impaired loans and leases: At June 30, 2019 (In thousands) Unpaid Principal Balance Total Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 109,366 $ 100,168 $ 64,494 $ 35,674 $ 3,969 Consumer - home equity 40,761 37,332 29,295 8,037 1,292 Commercial non-mortgage 127,092 97,735 61,199 36,536 8,691 Asset-based 510 184 — 184 5 Commercial real estate 19,734 13,879 6,920 6,959 656 Equipment financing 3,949 3,949 771 3,178 168 Total $ 301,412 $ 253,247 $ 162,679 $ 90,568 $ 14,781 At December 31, 2018 (In thousands) Unpaid Principal Balance Total Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 113,575 $ 103,531 $ 64,899 $ 38,632 $ 4,286 Consumer - home equity 44,654 39,144 30,576 8,568 1,383 Commercial non-mortgage 120,165 99,287 65,724 33,563 7,818 Asset-based 550 225 — 225 6 Commercial real estate 13,355 10,828 2,125 8,703 1,661 Equipment financing 6,368 6,315 2,946 3,369 196 Total $ 298,667 $ 259,330 $ 166,270 $ 93,060 $ 15,350 The following table summarizes the average recorded investment and interest income recognized for impaired loans and leases: Three months ended June 30, Six months ended June 30, 2019 2018 2019 2018 (In thousands) Average Recorded Investment Accrued Interest Income Cash Basis Interest Income Average Accrued Cash Basis Interest Income Average Recorded Investment Accrued Cash Basis Interest Income Average Recorded Investment Accrued Cash Basis Interest Income Residential $ 101,245 $ 912 $ 282 $ 110,787 $ 948 $ 265 $ 101,850 $ 1,820 $ 546 $ 111,965 $ 1,929 $ 518 Consumer - home equity 38,092 287 241 42,112 290 250 38,238 556 521 43,536 584 500 Commercial non-mortgage 106,753 844 — 80,475 871 — 98,511 1,764 — 78,896 1,410 — Asset based 201 — — 1,347 — — 204 — — 875 — — Commercial real estate 13,070 61 — 11,802 38 — 12,354 134 — 11,951 134 — Equipment financing 4,451 — — 6,320 35 — 5,132 — — 4,755 71 — Total $ 263,812 $ 2,104 $ 523 $ 252,843 $ 2,182 $ 515 $ 256,289 $ 4,274 $ 1,067 $ 251,978 $ 4,128 $ 1,018 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 default (PD) and the loss given default (LGD). The credit risk grade system assigns a rating to each borrower and to the facility, which together form a Composite Credit Risk Profile. 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 Composite Credit Risk Profile has ten grades, with each grade corresponding to a progressively greater risk of default. Grades (1) - (6) are considered pass ratings, and (7) - (10) are considered 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 a borrower's current financial position and outlook, risk profile, and the related collateral and structural position. Loan officers review updated financial information or other loan factors 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 (7) Special Mention credit has the potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the asset. An (8) Substandard asset has a well defined weakness that jeopardizes the full repayment of the debt. An asset rated (9) Doubtful 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 (10) Loss, 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 June 30, At December 31, At June 30, At December 31, At June 30, At December 31, (1) - (6) Pass $ 6,124,187 $ 5,781,138 $ 5,047,238 $ 4,773,298 $ 495,381 $ 494,585 (7) Special Mention 168,290 206,351 95,528 75,338 2,560 1,303 (8) Substandard 220,758 222,405 81,616 78,509 7,612 12,509 (9) Doubtful 6,718 6,712 — — — — Total $ 6,519,953 $ 6,216,606 $ 5,224,382 $ 4,927,145 $ 505,553 $ 508,397 For residential and consumer loans, the primary credit quality indicator that the Company considers is past due status. Other factors, such as, updated Fair Isaac Corporation (FICO) scores, employment status, collateral, geography, loans discharged in bankruptcy, and the status of first lien position loans on second lien position loans, may also be evaluated as credit quality indicators. On an ongoing basis for portfolio monitoring purposes, the Company estimates the current value of property secured as collateral for 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 real estate price data is applied to the loan portfolios taking into account the age of the most recent valuation and geographic area. Troubled Debt Restructurings The following table summarizes information for troubled debt restructurings (TDRs): (Dollars in thousands) At June 30, At December 31, 2018 Accrual status $ 136,081 $ 138,479 Non-accrual status 106,986 91,935 Total recorded investment of TDRs $ 243,067 $ 230,414 Specific reserves for TDRs included in the balance of ALLL $ 14,368 $ 11,930 Additional funds committed to borrowers in TDR status 6,160 3,893 For the portion of TDRs deemed to be uncollectible, Webster charged off $4.2 million and $4.5 million for the three months ended June 30, 2019 and 2018 , respectively, and $5.6 million , and $5.2 million for the six months ended June 30, 2019 and 2018 , respectively. The following table provides information on the type of concession for loans and leases modified as TDRs: Three months ended June 30, Six months ended June 30, 2019 2018 2019 2018 Number of Post- (1) Number of Post- (1) Number of Post- (1) Number of Post- (1) (Dollars in thousands) Residential Extended Maturity 3 $ 421 — $ — 4 $ 940 — $ — Maturity/Rate Combined 8 1,397 3 276 13 1,848 3 276 Other (2) 2 281 8 1,685 4 542 13 2,442 Consumer - home equity Extended Maturity 2 225 — — 4 370 2 193 Maturity/Rate Combined 2 110 1 335 2 110 3 448 Other (2) 6 466 14 915 19 1,220 25 1,693 Commercial non - mortgage Extended Maturity 4 69 — — 6 193 3 85 Adjusted Interest Rate 1 100 — — 1 100 — — Maturity/Rate Combined 2 46 2 51 3 71 2 51 Other (2) 4 12,029 7 24,059 19 34,056 9 28,743 Commercial real estate Extended Maturity — — 1 52 — — 2 97 Adjusted Interest rates — — 1 245 — — 1 245 Maturity/Rate Combined — — 1 5,111 — — 1 5,111 Other (2) — — — — 2 2,636 — — Total TDRs 34 $ 15,144 38 $ 32,729 77 $ 42,086 64 $ 39,384 (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, or other concessions. There were no significant amounts of loans and leases modified as TDRs within the previous 12 months and for which there was a payment default for the three and six months ended June 30, 2019 and 2018 . The recorded investment of TDRs in commercial, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: (In thousands) At June 30, 2019 At December 31, 2018 (1) - (6) Pass $ 19,295 $ 13,165 (7) Special Mention 72 84 (8) Substandard 79,482 67,880 (9) Doubtful 6,718 6,610 Total $ 105,567 $ 87,739

Transfers of Financial Assets

Transfers of Financial Assets	6 Months Ended
	Jun. 30, 2019
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. Residential mortgage origination fees, adjustments for changes in fair value, any gain or loss from initial measurement on loans held for sale, and the gain or loss on loans sold are included as mortgage banking activities in the consolidated income statement. 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 loan repurchase requests received by the Company for which management evaluates the identity of the 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 loan 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 potential future requests. 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 consolidated income statement. The following table provides a summary of activity in the reserve for loan repurchases: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 676 $ 664 $ 674 $ 872 Provision (benefit) charged to expense 1,813 13 1,820 (190 ) Repurchased loans and settlements charged off (1,805 ) (3 ) (1,810 ) (8 ) Ending balance $ 684 $ 674 $ 684 $ 674 The increase to the provision and corresponding charge-off during the three and six months ended June 30, 2019 was related to a discrete legal settlement in connection with previously sold loans. The following table provides information for mortgage banking activities: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Residential mortgage loans held for sale: Proceeds from sale $ 42,851 $ 45,257 $ 63,464 $ 90,063 Loans sold with servicing rights retained 39,465 39,822 56,813 79,726 Net gain on sale 700 598 858 1,681 Ancillary fees 320 402 581 812 Fair value option adjustment (88 ) 235 257 (114 ) Additionally, certain loans not originated for sale were sold at approximately carrying value, consisting of residential loans for cash proceeds of $4.0 million and commercial loans for cash proceeds of $16.1 million resulting in a gain of approximately $615 thousand for the six months ended June 30, 2019 , and commercial loans for cash proceeds of $34 thousand for the six months ended June 30, 2018 . The Company services residential mortgage loans totaling $2.4 billion at June 30, 2019 and $2.5 billion at December 31, 2018 . The following table presents the changes in carrying value for mortgage servicing assets: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 19,785 $ 24,403 $ 21,215 $ 25,139 Additions 791 1,038 1,253 2,450 Amortization (1,864 ) (2,100 ) (3,756 ) (4,248 ) Ending balance $ 18,712 $ 23,341 $ 18,712 $ 23,341 Mortgage servicing assets are recorded at fair value upon transfer, and thereafter are carried at the lower of cost or fair value. Loan servicing fees, net of mortgage servicing rights amortization, were $0.4 million and $0.3 million for the three months ended June 30, 2019 and 2018 , respectively, and $0.9 million and $0.6 million for the six months ended June 30, 2019 and 2018 , respectively, and are included as a component of loan related fees in the consolidated income statement. See Note 14: Fair Value Measurements for additional fair value information on mortgage servicing assets and loans held for sale.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill and other intangible assets by reportable segment consisted of the following: At June 30, 2019 At December 31, 2018 (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Goodwill: Community Banking $ 516,560 $ 516,560 HSA Bank 21,813 21,813 Total goodwill $ 538,373 $ 538,373 Other intangible assets: HSA Bank - Core deposits $ 22,000 $ (11,957 ) $ 10,043 $ 22,000 $ (10,842 ) $ 11,158 HSA Bank - Customer relationships 21,000 (7,202 ) 13,798 21,000 (6,394 ) 14,606 Total other intangible assets $ 43,000 $ (19,159 ) $ 23,841 $ 43,000 $ (17,236 ) $ 25,764 As of June 30, 2019 , the remaining estimated aggregate future amortization expense for intangible assets is as follows: (In thousands) Remainder of 2019 $ 1,923 2020 3,847 2021 3,847 2022 3,847 2023 3,847 Thereafter 6,530

Deposits

Deposits	6 Months Ended
	Jun. 30, 2019
Banking and Thrift [Abstract]
Deposits	A summary of deposits by type follows: (In thousands) At June 30, At December 31, Non-interest-bearing: Demand $ 4,174,806 $ 4,162,446 Interest-bearing: Health savings accounts 6,212,372 5,740,601 Checking 2,636,109 2,518,472 Money market 2,073,006 2,100,084 Savings 4,169,492 4,140,696 Time deposits 3,332,993 3,196,546 Total interest-bearing $ 18,423,972 $ 17,696,399 Total deposits $ 22,598,778 $ 21,858,845 Time deposits and interest-bearing checking, included in above balances, obtained through brokers $ 700,315 $ 869,003 Time deposits, included in above balance, that exceed the FDIC limit 701,839 555,949 Deposit overdrafts reclassified as loan balances 1,114 2,245 The scheduled maturities of time deposits are as follows: (In thousands) At June 30, Remainder of 2019 $ 1,967,980 2020 961,586 2021 300,299 2022 65,878 2023 29,139 Thereafter 8,111 Total time deposits $ 3,332,993

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Borrowings	Borrowings Total borrowings of $2.9 billion at June 30, 2019 and $2.6 billion at December 31, 2018 are described in detail below. The following table summarizes securities sold under agreements to repurchase and other borrowings: At June 30, At December 31, (In thousands) Amount Rate Amount Rate Securities sold under agreements to repurchase (1) : Original maturity of one year or less $ 216,620 0.46 % $ 236,874 0.35 % Original maturity of greater than one year, non-callable 100,000 1.86 — — Total securities sold under agreements to repurchase 316,620 0.90 236,874 0.35 Fed funds purchased 640,300 2.43 345,000 2.52 Securities sold under agreements to repurchase and other borrowings $ 956,920 1.92 $ 581,874 1.64 (1) The Company has right of offset with respect to all repurchase agreement assets and liabilities. However, securities sold under agreements to repurchase represents the gross amount for these transactions, as only liabilities are outstanding for the periods presented. Repurchase agreements are used as a source of borrowed funds and are collateralized by U.S. Government agency mortgage-backed securities. Repurchase agreement counterparties are limited to primary dealers in government securities and commercial or municipal customers through Webster’s Treasury Unit. The following table provides information for FHLB advances: At June 30, At December 31, (Dollars in thousands) Amount Weighted- Average Contractual Coupon Rate Amount Weighted- Average Contractual Coupon Rate Maturing within 1 year $ 1,078,026 2.37 % $ 1,403,026 2.55 % After 1 but within 2 years 190,000 1.71 215,000 1.73 After 2 but within 3 years 150,000 3.52 200,000 3.16 After 3 but within 4 years 140 — 150 — After 4 but within 5 years 236 2.95 242 2.95 After 5 years 8,254 2.65 8,390 2.65 FHLB advances and overall rate $ 1,426,656 2.40 $ 1,826,808 2.52 Aggregate carrying value of assets pledged as collateral $ 6,379,552 $ 6,689,761 Remaining borrowing capacity 2,633,480 2,568,664 Webster Bank is in compliance with FHLB collateral requirements for the periods presented. Eligible collateral, primarily certain residential and commercial real estate loans, has been pledged to secure FHLB advances. The following table summarizes long-term debt: (Dollars in thousands) At June 30, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 $ 150,000 $ 150,000 4.100% Senior fixed-rate notes due March 25, 2029 (1) 315,812 — Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total notes and subordinated debt 543,132 227,320 Discount on senior fixed-rate notes (1,521 ) (608 ) Debt issuance cost on senior fixed-rate notes (3,232 ) (691 ) Long-term debt $ 538,379 $ 226,021 (1) In March 2019, the Company completed a $300.0 million senior fixed-rate notes issuance. The fixed interest rate has been designated in a fair value hedging relationship and swapped to a weighted-average variable rate of 4.01% at June 30, 2019 . The $15.8 million basis adjustment included in the carrying value reflects the changes in the benchmark rate. (2) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month London Interbank Offered Rate plus 2.95% , was 5.36% at June 30, 2019 and 5.74% at December 31, 2018 .

Leases Leases

Leases Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	The Company, as lessee, primarily leases office space, banking centers, and certain other assets. These leases are generally classified as operating leases, however, an insignificant amount of the leases are classified as finance leases. The Company's operating leases generally have lease terms for periods of 5 to 20 years with various renewal options. The Company, by policy, does not include renewal options for leases as part of its ROU assets and lease liabilities unless they are deemed reasonably certain to exercise. The Company does not have any material sub-lease agreements. During 2019, the Company began recognizing operating leases on its consolidated balance sheet by recording a lease liability representing the Company’s legal obligation to make lease payments, and a ROU asset representing its legal right to use the leased office space, banking centers and certain other assets. The following table summarizes lessee information related to the Company’s operating ROU assets and lease liability: At June 30, 2019 (In thousands) Operating Leases Consolidated Balance Sheet Line Item Location ROU lease assets $ 158,270 Premises and equipment, net Lease liabilities 178,724 Accrued expenses and other liabilities Operating lease expense is comprised of operating lease costs and variable lease costs, net of sublease income. The pattern and measurement of expense recognition of these costs was not significantly impacted by ASU 2016-02 and subsequent ASUs issued to amend Topic 842. Variable lease payments are defined as payments made for the right to use an asset that vary because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. Variable lease payments that are dependent on an index or a rate are initially measured using the index or rate at the commencement date and are included in the measurement of a lease liability. Variable lease payments that are not dependent on an index or a rate, or changes in variable payments based on an index or rate after the commencement date, are excluded from the measurement of a lease liability and recognized in the period incurred. All variable lease payments are included within variable lease costs presented below. The components of operating lease cost and other related information are as follows: Three months ended June 30, 2019 Six months ended June 30, 2019 (In thousands) Lease Cost: Operating lease costs $ 7,487 $ 14,872 Variable lease costs 1,068 2,321 Sublease income (155 ) (295 ) Total operating lease cost $ 8,400 $ 16,898 Other Information: Cash paid for amounts included in the measurement of lease liabilities $ 7,738 $ 15,411 Right-of-use assets obtained in exchange for new operating lease liabilities 6,296 12,934 Weighted-average remaining lease term, in years - operating leases at June 30, 2019 8.2 Weighted-average discount rate - operating leases at June 30, 2019 3.44 % The undiscounted scheduled maturities reconciled to total operating lease liabilities are as follows: (In thousands) At June 30, 2019 Remainder of 2019 $ 13,436 2020 31,178 2021 29,578 2022 25,857 2023 22,812 Thereafter 86,089 Total operating lease liability payments 208,950 Less: Present value adjustment 30,226 Lease liabilities $ 178,724 See Note 4: Loans and Leases

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net of Tax	6 Months Ended
	Jun. 30, 2019
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, net of tax (AOCL) by component: Three months ended June 30, 2019 Six months ended June 30, 2019 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ (43,815 ) $ (9,117 ) $ (48,909 ) $ (101,841 ) $ (71,374 ) $ (9,313 ) $ (49,965 ) $ (130,652 ) OCI (OCL) before reclassifications 34,409 (870 ) — 33,539 61,968 (1,709 ) — 60,259 Amounts reclassified from AOCL — 1,056 1,056 2,112 — 2,091 2,112 4,203 Net current-period OCI 34,409 186 1,056 35,651 61,968 382 2,112 64,462 Ending balance $ (9,406 ) $ (8,931 ) $ (47,853 ) $ (66,190 ) $ (9,406 ) $ (8,931 ) $ (47,853 ) $ (66,190 ) Three months ended June 30, 2018 Six months ended June 30, 2018 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ (55,371 ) $ (12,494 ) $ (47,614 ) $ (115,479 ) $ (27,947 ) $ (15,016 ) $ (48,568 ) $ (91,531 ) (OCL)/OCI before reclassifications (9,246 ) 294 — (8,952 ) (36,670 ) 1,423 — (35,247 ) Amounts reclassified from AOCL — 1,386 1,109 2,495 — 2,779 2,063 4,842 Net current-period (OCL)/OCI (9,246 ) 1,680 1,109 (6,457 ) (36,670 ) 4,202 2,063 (30,405 ) Ending balance $ (64,617 ) $ (10,814 ) $ (46,505 ) $ (121,936 ) $ (64,617 ) $ (10,814 ) $ (46,505 ) $ (121,936 ) The following tables provide information for the items reclassified from AOCL: (In thousands) Three months ended June 30, Six months ended June 30, Associated Line Item in the Condensed Consolidated Statements of Income AOCL Components 2019 2018 2019 2018 Derivative instruments: Cash flow hedges $ (1,408 ) $ (1,861 ) $ (2,799 ) $ (3,732 ) Interest expense Cash flow hedges (12 ) — (12 ) — Interest income Tax benefit 364 475 720 953 Income tax expense Net of tax $ (1,056 ) $ (1,386 ) $ (2,091 ) $ (2,779 ) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,429 ) $ (1,493 ) $ (2,859 ) $ (2,778 ) (1) Tax benefit 373 384 747 715 Income tax expense Net of tax $ (1,056 ) $ (1,109 ) $ (2,112 ) $ (2,063 ) (1) These AOCL components are included in the computation of net periodic benefit cost, see Note 15: Retirement Benefit Plans for further details.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Matters	Regulatory Matters Capital Requirements Webster Financial Corporation is subject to regulatory capital requirements administered by the Federal Reserve System, 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 Financial Corporation 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 Financial Corporation 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. Basel III total risk-based capital is comprised of three categories: 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 adjustments. Common shareholders' equity, for purposes of CET1 capital, excludes AOCL 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: At June 30, 2019 Actual Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,401,959 11.41 % $ 947,715 4.5 % $ 1,368,922 6.5 % Total risk-based capital 2,838,524 13.48 1,684,827 8.0 2,106,034 10.0 Tier 1 risk-based capital 2,546,996 12.09 1,263,620 6.0 1,684,827 8.0 Tier 1 leverage capital 2,546,996 9.09 1,120,243 4.0 1,400,303 5.0 Webster Bank CET1 risk-based capital $ 2,574,538 12.23 % $ 947,077 4.5 % $ 1,368,000 6.5 % Total risk-based capital 2,788,746 13.25 1,683,692 8.0 2,104,615 10.0 Tier 1 risk-based capital 2,574,538 12.23 1,262,769 6.0 1,683,692 8.0 Tier 1 leverage capital 2,574,538 9.20 1,119,896 4.0 1,399,871 5.0 At December 31, 2018 Actual Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,284,978 11.44 % $ 898,972 4.5 % $ 1,298,514 6.5 % Total risk-based capital 2,722,194 13.63 1,598,172 8.0 1,997,715 10.0 Tier 1 risk-based capital 2,430,015 12.16 1,198,629 6.0 1,598,172 8.0 Tier 1 leverage capital 2,430,015 9.02 1,077,303 4.0 1,346,628 5.0 Webster Bank CET1 risk-based capital $ 2,170,566 10.87 % $ 898,317 4.5 % $ 1,297,569 6.5 % Total risk-based capital 2,385,425 11.95 1,597,008 8.0 1,996,260 10.0 Tier 1 risk-based capital 2,170,566 10.87 1,197,756 6.0 1,597,008 8.0 Tier 1 leverage capital 2,170,566 8.06 1,076,712 4.0 1,345,889 5.0 Dividend Restrictions Webster Financial Corporation is dependent upon dividends from Webster Bank to provide funds for its cash requirements, including payments of dividends to shareholders. Federal and state banking regulations limit the amount of dividends that may be paid by Webster Bank, without the express approval of the OCC, to its retained net profits, defined by the OCC as net income less dividends declared during the period, for the preceding two years plus retained net profits up to the date of any dividend declaration. In addition, the effect of any dividend declaration must not cause the regulatory capital of Webster Bank to fall below specified minimum levels and, the OCC has discretion to prohibit any otherwise permitted capital distribution on general safety and soundness grounds. Dividends paid by Webster Bank to Webster Financial Corporation totaled $110 million during the six months ended June 30, 2019 compared to $150 million during the six months ended June 30, 2018 . Cash Restrictions Webster Bank is required by Federal Reserve System regulations to hold cash reserve balances on hand or with a Federal Reserve Bank. Pursuant to this requirement, it held $104.0 million at June 30, 2019 and $81.2 million at December 31, 2018 . These restricted cash amounts are included in cash and due from banks, in the consolidated balance sheet.

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2019
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 June 30, Six Months Ended June 30, (In thousands, except per share data) 2019 2018 2019 2018 Earnings for basic and diluted earnings per common share: Net income $ 98,649 $ 81,682 $ 198,385 $ 161,907 Less: Preferred stock dividends 1,969 1,969 3,938 3,916 Net income available to common shareholders 96,680 79,713 194,447 157,991 Less: Earnings applicable to participating restricted stock 487 224 964 418 Earnings applicable to common shareholders $ 96,193 $ 79,489 $ 193,483 $ 157,573 Shares: Weighted-average common shares outstanding - basic 91,534 91,893 91,550 91,913 Effect of dilutive securities 321 280 348 323 Weighted-average common shares outstanding - diluted 91,855 92,173 91,898 92,236 Earnings per common share: Basic $ 1.05 $ 0.87 $ 2.11 $ 1.71 Diluted 1.05 0.86 2.11 1.71 Dilutive Securities The Company maintains stock compensation plans under which restricted stock, restricted stock units, non-qualified stock options, incentive stock options, or stock appreciation rights may be granted to employees and directors. The effect of dilutive securities for the periods presented is primarily the result of outstanding stock options, as well as non-participating restricted stock. Potential common shares from non-participating restricted stock, of 87 thousand and 53 thousand for the three months ended June 30, 2019 and 2018 , respectively, and 59 thousand and 61 thousand for the six months ended June 30, 2019 and 2018 , respectively, are excluded from the effect of dilutive securities because under application of the treasury stock method they would have been anti-dilutive.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Risk Management Objective of Using Derivatives Webster manages economic risks, such as interest rate, liquidity, and credit risks by managing the amount, sources, and duration of its debt funding in conjunction with the use of interest rate derivative financial instruments. Webster enters into interest rate derivatives to mitigate the exposure related to business activities that result in the future receipt or payment of, both known and uncertain, cash amounts that are impacted by interest rates. The primary objective for using interest rate derivatives is to add stability to interest expense by managing exposure to interest rate movements. To accomplish this objective, Webster uses interest rate swaps and interest rate caps or floors as part of its interest rate risk management strategy. Interest rate swaps and interest rate caps and floors 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, while interest rate floors designated as cash flow hedges involve the receipt of variable amounts from a counterparty if interest rates fall below the strike rate on the contract in exchange for payment of an up-front premium. Cash flow hedges are used to regulate the variable cash flows associated with existing variable-rate debt and forecasted issuances of debt. Derivative instruments designated as cash flow hedges are recorded on the consolidated balance sheet at fair value. Changes in fair value of the derivatives which are designated as cash flow hedges, and that qualify for hedge accounting, are recorded to AOCL and are reclassified into earnings in the subsequent periods that the hedged forecasted transaction affects earnings. Fair value hedges are used for certain fixed-rate obligations which can be exposed to a change in fair value attributable to changes in benchmark interest rates. An interest rate swap which involves the receipt of fixed-rate amounts from a counterparty in exchange for Webster making variable-rate payments over the life of the agreement, without the exchange of the underlying notional amount, is typically utilized. 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 risk hedged, is recognized in interest expense in the consolidated income statement. Additionally, in order to address certain other risk management matters, the Company also utilizes derivative instruments that do not qualify for hedge accounting. These derivative instruments, which are recorded on the consolidated balance sheet at fair value, with changes in fair value recognized each period as other non-interest income in the consolidated income statement, are described in the following paragraphs. Interest rate derivative contracts are 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, which results in minimal impact on earnings, except for fee income earned in such transactions. All contracts eligible for clearing are cleared through Chicago Mercantile Exchange (CME). In accordance with its amended rulebook, CME legally characterizes variation margin payments made to and received from CME as settlement of derivatives rather than as collateral against derivatives. Risk participation agreements (RPAs) are entered into as financial guarantees of performance on interest rate swap derivatives. The purchased (asset) or sold (liability) guarantee allows the Company to participate-in (fee received) or participate-out (fee paid) the risk associated with certain derivative positions executed with the borrower by the lead bank in a loan syndication. Other derivatives include foreign currency forward contracts related to lending arrangements and customer hedging activity, a VISA equity swap transaction, and mortgage banking derivatives such as mortgage-backed securities related to residential loan commitments and loans held for sale. Mortgage banking derivatives 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, or 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 mortgage-backed securities. Mandatory forward commitments 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 following table presents the notional amounts and fair value of derivative positions: At June 30, 2019 At December 31, 2018 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 (2) $ 825,000 $ 4,515 $ — $ — $ 325,000 $ 3,050 $ — $ — Not designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives (2) 1,398,175 1,578 2,905,312 9,617 2,767,518 6,570 1,276,109 2,012 Mortgage banking derivatives (3) 42,284 374 46,073 399 13,599 226 17,000 293 Other 13,124 111 53,318 599 11,952 308 43,097 553 Positions not subject to a master netting agreement Interest rate derivatives 3,084,348 135,374 1,218,947 3,250 1,668,012 35,635 2,367,876 36,017 RPAs 64,382 88 101,565 137 64,974 39 96,296 81 Other 6,550 393 709 43 8,506 450 1,208 54 Total not designated as hedging instruments 4,608,863 137,918 4,325,924 14,045 4,534,561 43,228 3,801,586 39,010 Gross derivative instruments, before netting $ 5,433,863 142,433 $ 4,325,924 14,045 $ 4,859,561 46,278 $ 3,801,586 39,010 Less: Legally enforceable master netting agreements 2,367 2,367 2,495 2,495 Less: Cash collateral posted/received 1,505 5,304 4,936 — Total derivative instruments, after netting (4) $ 138,561 $ 6,374 $ 38,847 $ 36,515 (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) Balances related to CME are presented as a single unit of account. Notional amounts of interest rate swaps cleared through CME include $0.9 billion and $1.9 billion for asset derivatives and $2.6 billion and $1.1 billion for liability derivatives at June 30, 2019 and December 31, 2018, respectively. The related fair values approximate zero . (3) Notional amounts include mandatory forward commitments of $45.0 million , while notional amounts do not include approved floating rate commitments of $12.3 million , at June 30, 2019 . (4) Fair value of assets are included in accrued interest receivable and other assets, while, fair value of liabilities are included in accrued expenses and other liabilities, in the consolidated balance sheet. The following table presents the change in fair value for derivatives designated as fair value hedges as well as the offsetting change in fair value on the hedged item, and the effect on the income statement for derivatives designated as cash flow hedges: Three months ended June 30, Six months ended June 30, (In thousands) Recognized In 2019 2018 2019 2018 Fair value hedges: Recognized on derivatives Interest expense $ 14,184 $ — $ 15,812 $ — Recognized on hedged items Interest expense (14,184 ) — (15,812 ) — Net recognized on fair value hedges $ — $ — $ — $ — Cash flow hedges: Interest rate derivatives Interest expense $ 980 $ 1,668 $ 1,933 $ 3,491 Interest rate derivatives Interest income 12 — 12 — Net recognized on cash flow hedges $ 992 $ 1,668 $ 1,945 $ 3,491 Additional information related to fair value hedges: Consolidated Balance Sheet Line Item in Which Hedged Item is Located Carrying Amount of Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount At June 30, At June 30, (In thousands) 2019 2018 2019 2018 Long-term debt $ 315,812 $ — $ 15,812 $ — The following table presents the effect on the income statement for derivatives not designated as hedging instruments: Three months ended June 30, Six months ended June 30, (In thousands) Recognized In 2019 2018 2019 2018 Interest rate derivatives Other non-interest income $ 4,071 $ 1,958 $ 5,122 $ 5,749 Mortgage banking derivatives Mortgage banking activities 157 (134 ) (251 ) (69 ) Other Other non-interest income (591 ) 2,024 (76 ) 1,434 Total not designated as hedging instruments $ 3,637 $ 3,848 $ 4,795 $ 7,114 Amounts for the change in the fair value of derivatives qualifying for cash flow hedge accounting treatment are recorded to AOCL and reclassified to interest expense as interest payments are made on Webster's variable-rate debt. Over the next twelve months, an estimated $1.9 million will be reclassified from AOCL as a reduction to interest expense. Amounts for gains and losses related to hedge terminations are also recorded to AOCL and subsequently amortized into interest expense over the respective terms of the hedged debt instruments. Over the next twelve months, an estimated $3.2 million will be reclassified from AOCL as an increase to interest expense. At June 30, 2019 , the remaining unamortized loss on the termination of cash flow hedges is $6.7 million and the maximum length of time over which forecasted transactions are hedged is 9.5 years. Additional information about cash flow hedge activity impacting AOCL, and the related amounts reclassified to interest expense is provided in Note 10: Accumulated Other Comprehensive Loss, Net of Tax . Information about the valuation methods used to measure the fair value of derivatives is provided in Note 14: Fair Value Measurements . Offsetting Derivatives Non-cleared derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral. Cash collateral received, in the amount of $1.5 million , is included in cash and due from banks and is considered restricted in nature. Net gain positions are recorded as assets and are included in accrued interest receivable and other assets, while, net loss positions are recorded as liabilities and are included in accrued expenses and other liabilities, in the consolidated balance sheet. The following table presents the transition from a gross basis to net basis, due to the application of counterparty netting agreements: At June 30, 2019 At December 31, 2018 (In thousands) Gross Amount Relationship Offset Cash Collateral Offset Net Amount Gross Amount Relationship Offset Cash Collateral Offset Net Amount Derivative instrument gains: Hedge accounting $ 4,515 $ 970 $ 1,505 $ 2,040 $ 3,050 $ 88 $ 567 $ 2,395 Non-hedge accounting 2,063 1,397 — 666 6,878 2,407 4,369 102 Total assets $ 6,578 $ 2,367 $ 1,505 $ 2,706 $ 9,928 $ 2,495 $ 4,936 $ 2,497 Derivative instrument losses: Hedge accounting $ — $ — $ — $ — $ — $ — $ — $ — Non-hedge accounting 10,615 2,367 5,304 2,944 2,566 2,495 — 71 Total liabilities $ 10,615 $ 2,367 $ 5,304 $ 2,944 $ 2,566 $ 2,495 $ — $ 71 Derivative Exposure Use of derivative contracts may expose Webster Bank to counterparty credit risk. The Company has International Swaps and Derivatives Association Master Agreements, including a Credit Support Annex, with all derivative counterparties. In accordance with counterparty credit agreements and derivative clearing rules, cash or securities are posted or received on a daily basis to offset counterparty derivative exposure. Remaining exposure is collateralized by securities received. In the event of default and if the collateral is not returned, the exposure would be offset by terminating the transaction. The Company had approximately $119.5 million in net margin collateral posted with financial counterparties or the derivative clearing organization at June 30, 2019 , which is primarily comprised of $40.4 million in initial margin posted at CME and $74.8 million in CME variation margin posted . The Company regularly evaluates the credit risk of its derivative customers, taking into account the likelihood of default, net exposures, and remaining contractual life, among other related factors. Credit risk exposure is mitigated as transactions with customers are generally secured by the same collateral of the underlying transactions being hedged. The net current credit exposure relating to interest rate derivatives with Webster Bank customers was $135.4 million at June 30, 2019 . 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 $35.6 million at June 30, 2019 .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
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 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. 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,) 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 available-for-sale investment securities within Level 1 of the valuation hierarchy. 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 results and has an established process to challenge their valuations, or methodologies, that appear unusual or unexpected. Available-for-Sale investment securities which include Agency CMO, Agency MBS, Agency CMBS, CMBS, CLO, and corporate debt, 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. All other 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. The change in value of derivative assets and liabilities attributable to credit risk was not significant during the reported periods. Webster reviews its counterparty exposure on a regular basis, and, when necessary, appropriate business actions are taken to mitigate 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 CME rulebook legally characterizes variation margin payments for over-the-counter derivatives as settlements rather than collateral, which impacts Webster's counterparty relationship with CME, resulting in the fair value of the instrument including cash collateral to be represented as a single unit of account. Mortgage Banking Derivatives. Forward sales of mortgage loans and 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. 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 Accounting Standards Codification ( ASC) Topic 825 "Financial Instruments." 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. The following table presents the fair value, unpaid principal balance, and accrual status, of assets accounted for under the fair value option: At June 30, 2019 At December 31, 2018 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 19,249 $ 19,017 $ 232 $ 7,908 $ 8,227 $ (319 ) Electing to measure originated loans held for sale at fair value reduces certain timing differences and better matches changes in the value of these assets with changes in the value of the derivatives used as an economic hedge on these assets. 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 cost basis of the investments held in the Rabbi Trust is $1.7 million at June 30, 2019 . Alternative Investments. Equity investments have a readily determinable fair value when quoted prices are available in an active market. The Company classifies alternative investments with a readily determinable fair value within Level 1 of the fair value hierarchy. Equity investments that do not have a readily available fair value may qualify for net asset value (NAV) measurement based on specific requirements. The Company's alternative investments accounted for at NAV consist of investments in non-public entities that generally cannot be redeemed since the Company’s investments are distributed as the underlying equity is liquidated. Alternative investments recorded at NAV are not classified within the fair value hierarchy. At June 30, 2019 , these alternative investments had a remaining unfunded commitment of $5.2 million . Summaries of the fair values of assets and liabilities measured at fair value on a recurring basis are as follows: At June 30, 2019 (In thousands) Level 1 Level 2 Level 3 NAV Total Financial assets held at fair value: U.S. Treasury Bills $ 9,998 $ — $ — $ — $ 9,998 Agency CMO — 214,252 — — 214,252 Agency MBS — 1,619,472 — — 1,619,472 Agency CMBS — 578,701 — — 578,701 CMBS — 429,068 — — 429,068 CLO — 96,389 — — 96,389 Corporate debt — 30,777 — — 30,777 Total available-for-sale investment securities 9,998 2,968,659 — — 2,978,657 Gross derivative instruments, before netting (1) 504 141,929 — — 142,433 Originated loans held for sale — 19,249 — — 19,249 Investments held in Rabbi Trust 4,649 — — — 4,649 Alternative investments — — — 2,990 2,990 Total financial assets held at fair value $ 15,151 $ 3,129,837 $ — $ 2,990 $ 3,147,978 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 620 $ 13,425 $ — $ — $ 14,045 At December 31, 2018 (In thousands) Level 1 Level 2 Level 3 NAV Total Financial assets held at fair value: U.S. Treasury Bills $ 7,550 $ — $ — $ — $ 7,550 Agency CMO — 234,923 — — 234,923 Agency MBS — 1,481,089 — — 1,481,089 Agency CMBS — 566,237 — — 566,237 CMBS — 445,581 — — 445,581 CLO — 112,771 — — 112,771 Corporate debt — 50,579 — — 50,579 Total available-for-sale investment securities 7,550 2,891,180 — — 2,898,730 Gross derivative instruments, before netting (1) 758 45,520 — — 46,278 Originated loans held for sale — 7,908 — — 7,908 Investments held in Rabbi Trust 4,307 — — — 4,307 Alternative investments — — — 2,563 2,563 Total financial assets held at fair value $ 12,615 $ 2,944,608 $ — $ 2,563 $ 2,959,786 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 588 $ 38,422 $ — $ — $ 39,010 (1) For information relating to the impact of netting derivative assets and derivative liabilities as well as the impact from offsetting cash collateral paid to the same derivative counterparties see Note 13: Derivative Financial Instruments . 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. At June 30, 2019 , no significant assets classified within Level 3 were identified and measured under this basis. The following is a description of valuation methodologies used for assets measured at fair value on a non-recurring basis. Alternative Investments. The measurement alternative has been elected for alternative investments without readily determinable fair values that do not qualify for the NAV practical expedient. The measurement alternative requires investments to be accounted for at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. These alternative investments are investments in non-public entities that generally cannot be redeemed since the investment is distributed as the underlying equity is liquidated. Accordingly, these alternative investments are classified within Level 2 of the fair value hierarchy. The carrying amount of these alternative investments was $6.8 million at June 30, 2019 . No reduction for impairments, or adjustments due to observable price changes, was identified during the six months ended June 30, 2019 . 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 primarily consists of commercial loans with observable inputs and is classified within Level 2. On the occasion that these loans should 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 within Level 3 of the fair value hierarchy. Other Real Estate Owned and Repossessed Assets. The total book value of other real estate owned (OREO) and repossessed assets was $5.2 million at June 30, 2019 . OREO and repossessed assets are accounted for at the lower of cost or fair value 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. Fair Value of Financial Instruments and Servicing Assets 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, as well as servicing assets. 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 results and has an established process to challenge their valuations, or methodologies, that appear unusual or unexpected. Held-to-Maturity investment securities, which include Agency CMO, Agency MBS, Agency CMBS, CMBS, and municipal bonds and notes, 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. Deposit liabilities are classified within Level 2 of the fair value hierarchy. Time Deposits. The fair value of a fixed-maturity certificate of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. Time deposits are classified within Level 2 of the fair value hierarchy. Securities Sold Under Agreements to Repurchase and Other Borrowings. The fair value of securities sold under agreements to repurchase and other borrowings that mature within 90 days is the carrying value. Fair value for all other balances are estimated using discounted cash flow analysis based on current market rates adjusted for associated credit risks, as appropriate. 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. Mortgage Servicing Assets. Mortgage servicing assets are accounted for at cost and subsequently measured under the amortization method. Mortgage servicing assets are subject to impairment testing and considered to be recognized at fair value when they are recorded at below cost. Amortization and impairment charges, if any, are included as a component of other non-interest income in the consolidated income statement. 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 estimated fair values of selected financial instruments and servicing assets are as follows: At June 30, 2019 At December 31, 2018 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Assets: Level 2 Held-to-maturity investment securities $ 4,636,707 $ 4,674,510 $ 4,325,420 $ 4,209,121 Level 3 Loans and leases, net 19,058,212 19,184,264 18,253,136 18,155,798 Mortgage servicing assets 18,712 36,572 21,215 45,478 Liabilities: Level 2 Deposit liabilities $ 19,265,785 $ 19,265,785 $ 18,662,299 $ 18,662,299 Time deposits 3,332,993 3,334,113 3,196,546 3,175,948 Securities sold under agreements to repurchase and other borrowings 956,920 954,844 581,874 581,874 FHLB advances 1,426,656 1,429,684 1,826,808 1,826,381 Long-term debt (1) 538,379 553,287 226,021 229,306 (1) Adjustments to the carrying amount of long-term debt for unamortized discount and debt issuance cost on senior fixed-rate notes are not included for determination of fair value, see Note 8: Borrowings .

Retirement Benefit Plans

Retirement Benefit Plans	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [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: Three months ended June 30, 2019 2018 (In thousands) Pension Plan SERP Other Benefits Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 1,977 $ 16 $ 21 $ 1,935 $ (21 ) $ 19 Expected return on plan assets (2,815 ) — — (3,180 ) — — Recognized net loss 1,430 3 (4 ) 1,160 333 — Net periodic benefit cost $ 592 $ 19 $ 17 $ (85 ) $ 312 $ 19 Six months ended June 30, 2019 2018 (In thousands) Pension Plan SERP Other Benefits Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 3,955 $ 32 $ 42 $ 3,720 $ 166 $ 39 Expected return on plan assets (5,630 ) — — (6,360 ) — — Recognized net loss 2,860 7 (8 ) 2,320 458 — Net periodic benefit cost $ 1,185 $ 39 $ 34 $ (320 ) $ 624 $ 39 The components of net periodic benefit cost, other than the service cost component, are included as a component of other expense reflected in non-interest expense in the consolidated income statement.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting Webster’s operations are organized into three reportable segments that represent its primary businesses - Commercial Banking, HSA Bank, and Community Banking. These three segments reflect how executive management responsibilities are assigned, the primary businesses, the products and services provided, the type of customer served, and how discrete financial information is currently evaluated. Certain corporate treasury activities of the Company, along with the amounts required to reconcile profitability metrics to amounts reported in accordance with GAAP, are included in the Corporate and Reconciling category. Description of Segment Reporting Methodology 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. Webster allocates interest income and interest expense to each business, while also transferring the primary interest rate risk exposures to the Corporate and Reconciling category, using a matched maturity funding concept called Funds Transfer Pricing (FTP). 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 overseen by the Company's Asset/Liability Committee (ALCO). 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. During the three months ended June 30, 2019, Webster refined and improved the precision of this allocation approach. Prior period provision for loan and lease losses amounts were revised accordingly. Allowance for loan and lease losses are included within the Corporate and Reconciling category’s total assets. 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. The following table presents total assets for Webster's reportable segments and the Corporate and Reconciling category: (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total At June 30, 2019 $ 11,061,635 $ 82,232 $ 9,059,657 $ 8,738,519 $ 28,942,043 At December 31, 2018 10,477,050 70,826 8,727,335 8,335,104 27,610,315 The following tables present the operating results, including all appropriate allocations, for Webster’s reportable segments and the Corporate and Reconciling category: Three months ended June 30, 2019 (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 92,171 $ 42,626 $ 102,699 $ 4,291 $ 241,787 Provision for loan and lease losses 7,741 — 4,159 — 11,900 Net interest income (expense) after provision for loan and lease losses 84,430 42,626 98,540 4,291 229,887 Non-interest income 14,645 24,979 27,675 8,554 75,853 Non-interest expense 46,196 34,253 96,166 4,025 180,640 Income before income tax expense 52,879 33,352 30,049 8,820 125,100 Income tax expense (benefit) 13,008 8,672 5,980 (1,209 ) 26,451 Net income $ 39,871 $ 24,680 $ 24,069 $ 10,029 $ 98,649 Three months ended June 30, 2018 (In thousands) Commercial Banking HSA Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 88,459 $ 35,265 $ 101,902 $ (616 ) $ 225,010 Provision (benefit) for loan and lease losses 8,630 — 1,870 — 10,500 Net interest income (expense) after provision for loan and lease losses 79,829 35,265 100,032 (616 ) 214,510 Non-interest income 15,041 22,882 26,378 4,073 68,374 Non-interest expense 42,979 31,220 95,197 11,063 180,459 Income (loss) before income tax expense 51,891 26,927 31,213 (7,606 ) 102,425 Income tax expense (benefit) 12,765 7,001 6,211 (5,234 ) 20,743 Net income (loss) $ 39,126 $ 19,926 $ 25,002 $ (2,372 ) $ 81,682 Six months ended June 30, 2019 (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 182,681 $ 84,367 $ 204,059 $ 12,231 $ 483,338 Provision for loan and lease losses 13,982 — 6,518 — 20,500 Net interest income (expense) after provision for loan and lease losses 168,699 84,367 197,541 12,231 462,838 Non-interest income 28,656 50,556 53,057 12,196 144,465 Non-interest expense 90,814 67,775 191,241 6,496 356,326 Income before income tax expense 106,541 67,148 59,357 17,931 250,977 Income tax expense (benefit) 26,209 17,459 11,812 (2,888 ) 52,592 Net income $ 80,332 $ 49,689 $ 47,545 $ 20,819 $ 198,385 Six months ended June 30, 2018 (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 173,110 $ 68,189 $ 200,830 $ (2,951 ) $ 439,178 Provision for loan and lease losses 15,477 — 6,023 — 21,500 Net interest income (expense) after provision for loan and lease losses 157,633 68,189 194,807 (2,951 ) 417,678 Non-interest income 30,357 45,551 51,573 9,640 137,121 Non-interest expense 84,224 62,735 192,026 13,089 352,074 Income (loss) before income tax expense 103,766 51,005 54,354 (6,400 ) 202,725 Income tax expense (benefit) 25,527 13,261 10,816 (8,786 ) 40,818 Net income $ 78,239 $ 37,744 $ 43,538 $ 2,386 $ 161,907

Revenue from Contracts with Cus

Revenue from Contracts with Customers Revenue from Contracts with customers	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers The following tables present revenues within the scope of ASC 606, Revenue from Contracts with Customers and the net amount of other sources of non-interest income that is within the scope of other GAAP topics: Three months ended June 30, 2019 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 3,085 $ 23,704 $ 16,289 $ 40 $ 43,118 Wealth and investment services 2,542 — 5,776 (9 ) 8,309 Other — 1,275 704 — 1,979 Revenue from contracts with customers 5,627 24,979 22,769 31 53,406 Other sources of non-interest income 9,018 — 4,906 8,523 22,447 Total non-interest income $ 14,645 $ 24,979 $ 27,675 $ 8,554 $ 75,853 Three months ended June 30, 2018 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 3,180 $ 22,006 $ 15,663 $ 10 $ 40,859 Wealth and investment services 2,587 — 5,878 (9 ) 8,456 Other — 876 640 — 1,516 Revenue from contracts with customers 5,767 22,882 22,181 1 50,831 Other sources of non-interest income 9,274 — 4,197 4,072 17,543 Total non-interest income $ 15,041 $ 22,882 $ 26,378 $ 4,073 $ 68,374 Six months ended June 30, 2019 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 6,121 $ 48,232 $ 31,654 $ 135 $ 86,142 Wealth and investment services 5,026 — 10,951 (17 ) 15,960 Other — 2,324 1,205 — 3,529 Revenue from contracts with customers 11,147 50,556 43,810 118 105,631 Other sources of non-interest income 17,509 — 9,247 12,078 38,834 Total non-interest income $ 28,656 $ 50,556 $ 53,057 $ 12,196 $ 144,465 Six months ended June 30, 2018 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 6,402 $ 43,818 $ 30,972 $ 118 $ 81,310 Wealth and investment services 5,126 — 11,217 (17 ) 16,326 Other — 1,733 1,133 — 2,866 Revenue from contracts with customers 11,528 45,551 43,322 101 100,502 Other sources of non-interest income 18,829 — 8,251 9,539 36,619 Total non-interest income $ 30,357 $ 45,551 $ 51,573 $ 9,640 $ 137,121 The major types of revenue streams that are within the scope of ASC 606 are described below: Deposit service fees, predominately consist of fees earned from deposit accounts and interchange fees. Fees earned from deposit accounts relate to event-driven services and periodic account maintenance activities. Webster's obligations for event-driven services are satisfied at the time the service is delivered, while the obligations for maintenance services is satisfied monthly. Interchange fees are assessed as the performance obligation is satisfied, which is at the point in time the card transaction is authorized. Wealth and investment services, consists of fees earned from investment and securities-related services, trust and other related services. Obligations for wealth and investment services are generally satisfied over time through a time-based measurement of progress, while certain obligations may be satisfied at points in time for activities that are transactional in nature.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
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. 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 to which they relate. The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk: (In thousands) At June 30 At December 31, 2018 Commitments to extend credit $ 6,107,450 $ 5,840,585 Standby letter of credit 189,890 189,040 Commercial letter of credit 22,837 21,181 Total credit-related financial instruments with off-balance sheet risk $ 6,320,177 $ 6,050,806 These commitments subject the Company to potential exposure in excess of the 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 consolidated balance sheet. The following table provides a summary of activity in the reserve for unfunded credit commitments: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 2,511 $ 2,294 $ 2,506 $ 2,362 Provision charged to expense 26 302 31 234 Ending balance $ 2,537 $ 2,596 $ 2,537 $ 2,596

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
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 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 related Notes, for the year ended December 31, 2018 , included in our Form 10-K filed with the SEC. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on the Company's consolidated financial statements. Use of Estimates
New Accounting Pronouncements, Policy [Policy Text Block]	Accounting Standards Adopted During 2019 Effective January 1, 2019 , the following ASUs were adopted by the Company: ASU No. 2018-16, Derivatives and Hedging (Topic 815) - Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. The Update permits the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the interest rates on direct U.S. Treasury obligations, the London Interbank Offered Rate swap rate, the OIS rate based on the Fed Funds Effective Rate, and the Securities Industry and Financial Markets Association Municipal Swap Rate. The Company adopted the Update during the first quarter of 2019 on a prospective basis. The adoption of this guidance did not have a material effect on the Company's consolidated financial statements. ASU No. 2017-12, Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities. The purpose of the Update is to better align a company’s risk management and financial reporting for hedging activities with the economic objectives of those activities. The Update expands an entity's ability to hedge non-financial and financial risk components and reduce complexity in hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness, and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line in which the earnings effect of the hedged item is reported. The Company adopted the Update during the first quarter of 2019 on a modified retrospective basis. The adoption of this guidance did not have a material effect on the Company's consolidated financial statements. The Company has provided enhanced disclosures in Note 13: Derivative Financial Instruments as a result of adopting this Update. ASU No. 2016-02, Leases (Topic 842) and subsequent ASUs issued to amend this Topic. The Updates introduce a lessee model that requires substantially all leases to be recorded as assets and liabilities on the balance sheet and requires expanded quantitative and qualitative disclosures regarding key information about leasing arrangements. The lessor model remains substantially the same with targeted improvements that do not materially impact the Company. The Company adopted the Updates during the first quarter of 2019 using the new transition method option that allows the use of effective date, January 1, 2019, as the date of initial application of the new lease accounting standard and to recognize a cumulative-effect adjustment to the opening balance of retained earnings upon adoption. The Company elected the transition relief package of practical expedients which forgoes the requirement to reassess the existence of leases in existing contracts, their lease classification and the accounting treatment of their initial direct costs. As a practical expedient, the Company has also made a policy election to not separate non-lease components from lease components for its real estate leases and instead account for each separate lease components and non-lease components associated with that lease component as a single lease component. The Company will separately account for the lease and non-lease components in its equipment leases. The Company determines whether a contract contains a lease based on whether a contract, or a part of a contract, conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The discount rate used is either the rate implicit in the lease, or when a rate cannot be readily determined an incremental borrowing rate. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term and amount equal to the lease payments, in a similar economic environment. As a result of adopting this Update, the Company recognized $157.2 million of right-of-use asset (ROU) and $178.2 million of lease liability, as of January 1, 2019. The Company also recorded a $0.5 million cumulative-effect adjustment directly to retained earnings as of January 1, 2019 for abandoned leased properties and the remaining deferred gains on sale-leaseback transactions which occurred prior to the date of adoption. See Note 9: Leasing for further information. Accounting Standards Issued But Not Yet Adopted The following list identifies ASUs applicable to the Company that have been issued by the Financial Accounting Standards Board (FASB) but are not yet effective: ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. The Update amends guidance on credit losses, hedge accounting, and recognition and measurement of financial instruments. The changes provide clarifications and codification improvements in relation to recently issued accounting updates. The amendments to the guidance on credit losses are considered in the paragraphs below related to our adoption of ASU 2016-13, and will be adopted concurrently with those Updates. The clarifications and amendments to the guidance on hedge accounting and recognition and measurement of financial instruments will be effective for the Company on January 1, 2020. The Company does not expect these changes to have a material impact on its consolidated financial statements. ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The Update aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The updated guidance also requires an entity to amortize the capitalized implementation costs as an expense over the term of the hosting arrangement and to present in the same income statement line item as the fees associated with the hosting arrangement. The Update is effective for the Company on January 1, 2020. Early adoption is permitted, although the Company does not intend to early adopt. The Company will apply the amendments in this update prospectively to all implementation costs incurred after the date of adoption. The Company does not expect this Update to have a material impact on its consolidated financial statements. ASU No. 2018-14, Compensation-Retirement Benefits - Defined Benefit Plan - General (Subtopic 715-20) - Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. The Update modifies the disclosure requirements for employers that sponsor defined benefit pension plans and other postretirement plans. The updated guidance will be effective for the Company on January 1, 2021. The Company does not expect this Update to have a material impact on its consolidated financial statements. ASU No. 2018-13, Fair Value Measurement (Topic 820) - Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The Update modifies the disclosure requirements on fair value measurements. The updated guidance will no longer require entities to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. However, it will require public companies to disclose changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 measurements. The Update is effective for the Company on January 1, 2020, and earlier adoption is permitted. The Company does not expect this Update to have a material impact on its consolidated financial statements. ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment. The Update simplifies quantitative goodwill impairment testing by requiring entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit's fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. This changes current guidance by eliminating the second step of the goodwill impairment analysis which involves calculating the implied fair value of goodwill determined in the same manner as the amount of goodwill recognized in a business combination upon acquisition. Entities will still have the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The Update must be applied prospectively and is effective for the Company on January 1, 2020. Early adoption is permitted. The Company does not expect this new guidance to have a material impact on its consolidated financial statements. ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments and subsequent ASUs issued to clarify this Topic. Current GAAP requires an incurred loss methodology for recognizing credit losses. This approach requires recognition of credit losses when it is probable a loss has been incurred. The main objective of this Update is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this Update will replace today's incurred loss approach with a new credit loss methodology known as the Current Expected Credit Loss (CECL) model which requires earlier recognition of credit losses using a lifetime credit loss measurement approach for financial assets carried at amortized cost. The CECL model requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. The change from an incurred loss method to an expected loss method represents a fundamental shift from existing GAAP and may result in a material increase to the Company's accounting for credit losses on financial instruments. To prepare for implementation of the new standard the Company has established a project lead and has empowered a steering committee comprised of members from different disciplines including Credit, Accounting, Finance, IT, and Treasury, as well as specific working groups to focus on key components of the development process. Through these working groups, the Company has begun to evaluate the effect that this Update, including the subsequent ASUs issued to clarify this Topic, will have on its financial statements and related disclosures. An implementation project plan has been created and is made up of targeted work streams focused on credit models, data management, treasury, and accounting. These work streams are collectively assessing required resources, use of existing and new models, and data availability. The new credit models will include additional assumptions used to calculate credit losses over the estimated life of the financial assets and will include the impact of forecasted macroeconomic conditions. The Company has contracted with system solution providers and is in the process of implementing the selected solutions. During 2019, the Company is focused on model validations as well as the development of processes and related controls. The Company will conduct a parallel run in the second half of 2019. These Updates are effective for the Company on January 1, 2020. The adoption of these Updates is expected to increase the Company's allowance for loan and lease losses. The magnitude of the increase will depend on the composition, characteristics, and credit quality of our loan and securities portfolios as well as the economic conditions in effect at the adoption date.

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 At December 31, 2018 (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 $ 9,997 $ 1 $ — $ 9,998 $ 7,549 $ 1 $ — $ 7,550 Agency CMO 213,307 2,209 (1,264 ) 214,252 238,968 412 (4,457 ) 234,923 Agency MBS 1,612,028 19,109 (11,665 ) 1,619,472 1,521,534 1,631 (42,076 ) 1,481,089 Agency CMBS 594,548 175 (16,022 ) 578,701 608,167 — (41,930 ) 566,237 CMBS 428,492 599 (23 ) 429,068 447,897 645 (2,961 ) 445,581 CLO 96,727 106 (444 ) 96,389 114,641 94 (1,964 ) 112,771 Corporate debt 35,551 — (4,774 ) 30,777 55,860 — (5,281 ) 50,579 Available-for-sale $ 2,990,650 $ 22,199 $ (34,192 ) $ 2,978,657 $ 2,994,616 $ 2,783 $ (98,669 ) $ 2,898,730 Held-to-maturity: Agency CMO $ 190,858 $ 1,089 $ (1,406 ) $ 190,541 $ 208,113 $ 287 $ (5,255 ) $ 203,145 Agency MBS 2,736,676 33,098 (20,616 ) 2,749,158 2,517,823 8,250 (79,701 ) 2,446,372 Agency CMBS 768,076 3,988 (3,684 ) 768,380 667,500 53 (22,572 ) 644,981 Municipal bonds and notes 746,345 23,473 (651 ) 769,167 715,041 2,907 (18,285 ) 699,663 CMBS 194,752 2,549 (37 ) 197,264 216,943 405 (2,388 ) 214,960 Held-to-maturity $ 4,636,707 $ 64,197 $ (26,394 ) $ 4,674,510 $ 4,325,420 $ 11,902 $ (128,201 ) $ 4,209,121
Summary of Changes in OTTI	Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 822 $ 1,364 $ 822 $ 1,364 Reduction for investment securities called — (261 ) — (261 ) Ending balance $ 822 $ 1,103 $ 822 $ 1,103
Summary of Gross Unrealized Losses not Considered OTTI	The following tables provide information on fair value and unrealized losses for the individual investment securities with an unrealized loss, aggregated by classification and length of time that the individual investment securities have been in a continuous unrealized loss position: At June 30, 2019 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 $ 6 $ — $ 83,924 $ (1,264 ) 11 $ 83,930 $ (1,264 ) Agency MBS — — 748,498 (11,665 ) 123 748,498 (11,665 ) Agency CMBS — — 542,244 (16,022 ) 34 542,244 (16,022 ) CMBS 45,740 (22 ) 17,000 (1 ) 10 62,740 (23 ) CLO 18,380 (320 ) 24,875 (124 ) 2 43,255 (444 ) Corporate debt 7,686 (862 ) 23,091 (3,912 ) 7 30,777 (4,774 ) Available-for-sale in an unrealized loss position $ 71,812 $ (1,204 ) $ 1,439,632 $ (32,988 ) 187 $ 1,511,444 $ (34,192 ) Held-to-maturity: Agency CMO $ 210 $ — $ 84,453 $ (1,406 ) 11 $ 84,663 $ (1,406 ) Agency MBS — — 1,268,211 (20,616 ) 166 1,268,211 (20,616 ) Agency CMBS — — 536,755 (3,684 ) 44 536,755 (3,684 ) Municipal bonds and notes — — 64,069 (651 ) 25 64,069 (651 ) CMBS 3,350 (3 ) 22,386 (34 ) 5 25,736 (37 ) Held-to-maturity in an unrealized loss position $ 3,560 $ (3 ) $ 1,975,874 $ (26,391 ) 251 $ 1,979,434 $ (26,394 ) At December 31, 2018 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 $ 15,524 $ (72 ) $ 180,641 $ (4,385 ) 36 $ 196,165 $ (4,457 ) Agency MBS 321,678 (2,078 ) 975,084 (39,998 ) 184 1,296,762 (42,076 ) Agency CMBS — — 566,237 (41,930 ) 37 566,237 (41,930 ) CMBS 343,457 (2,937 ) 5,193 (24 ) 39 348,650 (2,961 ) CLO 83,305 (1,695 ) 14,873 (269 ) 5 98,178 (1,964 ) Corporate debt 35,990 (1,820 ) 14,589 (3,461 ) 8 50,579 (5,281 ) Available-for-sale in an unrealized loss position $ 799,954 $ (8,602 ) $ 1,756,617 $ (90,067 ) 309 $ 2,556,571 $ (98,669 ) Held-to-maturity: Agency CMO $ 691 $ (1 ) $ 182,396 $ (5,254 ) 25 $ 183,087 $ (5,255 ) Agency MBS 288,635 (1,916 ) 1,892,951 (77,785 ) 272 2,181,586 (79,701 ) Agency CMBS — — 635,284 (22,572 ) 56 635,284 (22,572 ) Municipal bonds and notes 68,351 (882 ) 414,776 (17,403 ) 223 483,127 (18,285 ) CMBS 24,881 (270 ) 132,464 (2,118 ) 20 157,345 (2,388 ) Held-to-maturity in an unrealized loss position $ 382,558 $ (3,069 ) $ 3,257,871 $ (125,132 ) 596 $ 3,640,429 $ (128,201 )
Summary of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities by contractual maturity are set forth below: At June 30, 2019 Available-for-Sale Held-to-Maturity (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 9,997 $ 9,998 $ 2,350 $ 2,357 Due after one year through five years 17,000 17,032 6,812 6,959 Due after five through ten years 308,645 308,548 112,156 115,431 Due after ten years 2,655,008 2,643,079 4,515,389 4,549,763 Total debt securities $ 2,990,650 $ 2,978,657 $ 4,636,707 $ 4,674,510

Loans and Leases (Tables)

Loans and Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table summarizes loans and leases: (In thousands) At June 30, At December 31, 2018 Residential $ 4,718,704 $ 4,416,637 Consumer 2,301,291 2,396,704 Commercial 6,519,953 6,216,606 Commercial Real Estate 5,224,382 4,927,145 Equipment Financing 505,553 508,397 Loans and leases (1) (2) $ 19,269,883 $ 18,465,489 (1) Includes net deferred fees and net premiums/discounts of $8.2 million and $13.9 million at June 30, 2019 and December 31, 2018 , respectively. (2) At June 30, 2019 the Company had pledged $6.8 billion of eligible loans as collateral to support borrowing capacity at the Federal Home Loan Bank (FHLB) of Boston and the Federal Reserve Bank (FRB) of Boston.
Past Due Financing Receivables	The following tables summarize the aging of loans and leases: At June 30, 2019 (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 $ 6,922 $ 3,955 $ — $ 48,228 $ 59,105 $ 4,659,599 $ 4,718,704 Consumer: Home equity 7,451 2,574 — 31,870 41,895 2,035,234 2,077,129 Other consumer 2,776 1,180 — 1,190 5,146 219,016 224,162 Commercial: Commercial non-mortgage 1,300 688 410 52,452 54,850 5,387,985 5,442,835 Asset-based — — — 184 184 1,076,934 1,077,118 Commercial real estate: Commercial real estate 1,189 125 — 10,428 11,742 4,957,572 4,969,314 Commercial construction 1,355 — — — 1,355 253,713 255,068 Equipment financing 2,241 219 — 3,949 6,409 499,144 505,553 Total $ 23,234 $ 8,741 $ 410 $ 148,301 $ 180,686 $ 19,089,197 $ 19,269,883 At December 31, 2018 (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 $ 8,513 $ 4,301 $ — $ 49,188 $ 62,002 $ 4,354,635 $ 4,416,637 Consumer: Home equity 9,250 5,385 — 33,495 48,130 2,121,049 2,169,179 Other consumer 1,774 957 — 1,494 4,225 223,300 227,525 Commercial: Commercial non-mortgage 1,011 702 104 55,810 57,627 5,189,808 5,247,435 Asset-based — — — 224 224 968,947 969,171 Commercial real estate: Commercial real estate 1,275 245 — 8,242 9,762 4,698,552 4,708,314 Commercial construction — — — — — 218,831 218,831 Equipment financing 510 405 — 6,314 7,229 501,168 508,397 Total $ 22,333 $ 11,995 $ 104 $ 154,767 $ 189,199 $ 18,276,290 $ 18,465,489
Activity In Allowance For Losses	The following tables summarize the activity in, as well as the loan and lease balances that were evaluated for, the ALLL: At or for the three months ended June 30, 2019 Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 20,413 $ 26,919 $ 100,174 $ 58,893 $ 4,990 $ 211,389 Provision (benefit) charged to expense 2,667 1,313 3,391 4,615 (86 ) 11,900 Charge-offs (2,154 ) (4,098 ) (5,218 ) (2,473 ) (439 ) (14,382 ) Recoveries 295 1,972 453 33 11 2,764 Balance, end of period $ 21,221 $ 26,106 $ 98,800 $ 61,068 $ 4,476 $ 211,671 At or for the three months ended June 30, 2018 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 18,777 $ 34,239 $ 95,573 $ 51,436 $ 5,324 $ 205,349 Provision (benefit) charged to expense 659 813 4,490 4,428 110 10,500 Charge-offs (754 ) (4,907 ) (5,632 ) (40 ) (65 ) (11,398 ) Recoveries 325 1,614 909 9 14 2,871 Balance, end of period $ 19,007 $ 31,759 $ 95,340 $ 55,833 $ 5,383 $ 207,322 At or for the six months ended June 30, 2019 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 19,599 $ 28,681 $ 98,793 $ 60,151 $ 5,129 $ 212,353 Provision (benefit) charged to expense 3,554 1,036 11,618 4,324 (32 ) 20,500 Charge-offs (2,405 ) (8,071 ) (12,851 ) (3,446 ) (643 ) (27,416 ) Recoveries 473 4,460 1,240 39 22 6,234 Balance, end of period $ 21,221 $ 26,106 $ 98,800 $ 61,068 $ 4,476 $ 211,671 Individually evaluated for impairment $ 3,969 $ 1,292 $ 8,696 $ 656 $ 168 $ 14,781 Collectively evaluated for impairment $ 17,252 $ 24,814 $ 90,104 $ 60,412 $ 4,308 $ 196,890 Loan and lease balances: Individually evaluated for impairment $ 100,168 $ 37,332 $ 97,919 $ 13,879 $ 3,949 $ 253,247 Collectively evaluated for impairment 4,618,536 2,263,959 6,422,034 5,210,503 501,604 19,016,636 Loans and leases $ 4,718,704 $ 2,301,291 $ 6,519,953 $ 5,224,382 $ 505,553 $ 19,269,883 At or for the six months ended June 30, 2018 (In thousands) Residential Consumer Commercial Commercial Real Estate Equipment Financing Total ALLL: Balance, beginning of period $ 19,058 $ 36,190 $ 89,533 $ 49,407 $ 5,806 $ 199,994 Provision (benefit) charged to expense 909 2,493 11,910 6,532 (344 ) 21,500 Charge-offs (1,671 ) (9,981 ) (7,129 ) (117 ) (110 ) (19,008 ) Recoveries 711 3,057 1,026 11 31 4,836 Balance, end of period $ 19,007 $ 31,759 $ 95,340 $ 55,833 $ 5,383 $ 207,322 Individually evaluated for impairment $ 4,330 $ 1,498 $ 6,007 $ 2,061 $ 18 $ 13,914 Collectively evaluated for impairment $ 14,677 $ 30,261 $ 89,333 $ 53,772 $ 5,365 $ 193,408 Loan and lease balances: Individually evaluated for impairment $ 109,636 $ 41,636 $ 87,071 $ 12,677 $ 6,185 $ 257,205 Collectively evaluated for impairment 4,345,944 2,444,059 5,894,485 4,567,523 516,780 17,768,791 Loans and leases $ 4,455,580 $ 2,485,695 $ 5,981,556 $ 4,580,200 $ 522,965 $ 18,025,996
Impaired Loans	The following tables summarize impaired loans and leases: At June 30, 2019 (In thousands) Unpaid Principal Balance Total Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 109,366 $ 100,168 $ 64,494 $ 35,674 $ 3,969 Consumer - home equity 40,761 37,332 29,295 8,037 1,292 Commercial non-mortgage 127,092 97,735 61,199 36,536 8,691 Asset-based 510 184 — 184 5 Commercial real estate 19,734 13,879 6,920 6,959 656 Equipment financing 3,949 3,949 771 3,178 168 Total $ 301,412 $ 253,247 $ 162,679 $ 90,568 $ 14,781 At December 31, 2018 (In thousands) Unpaid Principal Balance Total Recorded Investment No Allowance Recorded Investment With Allowance Related Valuation Allowance Residential $ 113,575 $ 103,531 $ 64,899 $ 38,632 $ 4,286 Consumer - home equity 44,654 39,144 30,576 8,568 1,383 Commercial non-mortgage 120,165 99,287 65,724 33,563 7,818 Asset-based 550 225 — 225 6 Commercial real estate 13,355 10,828 2,125 8,703 1,661 Equipment financing 6,368 6,315 2,946 3,369 196 Total $ 298,667 $ 259,330 $ 166,270 $ 93,060 $ 15,350 The following table summarizes the average recorded investment and interest income recognized for impaired loans and leases: Three months ended June 30, Six months ended June 30, 2019 2018 2019 2018 (In thousands) Average Recorded Investment Accrued Interest Income Cash Basis Interest Income Average Accrued Cash Basis Interest Income Average Recorded Investment Accrued Cash Basis Interest Income Average Recorded Investment Accrued Cash Basis Interest Income Residential $ 101,245 $ 912 $ 282 $ 110,787 $ 948 $ 265 $ 101,850 $ 1,820 $ 546 $ 111,965 $ 1,929 $ 518 Consumer - home equity 38,092 287 241 42,112 290 250 38,238 556 521 43,536 584 500 Commercial non-mortgage 106,753 844 — 80,475 871 — 98,511 1,764 — 78,896 1,410 — Asset based 201 — — 1,347 — — 204 — — 875 — — Commercial real estate 13,070 61 — 11,802 38 — 12,354 134 — 11,951 134 — Equipment financing 4,451 — — 6,320 35 — 5,132 — — 4,755 71 — Total $ 263,812 $ 2,104 $ 523 $ 252,843 $ 2,182 $ 515 $ 256,289 $ 4,274 $ 1,067 $ 251,978 $ 4,128 $ 1,018
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 June 30, At December 31, At June 30, At December 31, At June 30, At December 31, (1) - (6) Pass $ 6,124,187 $ 5,781,138 $ 5,047,238 $ 4,773,298 $ 495,381 $ 494,585 (7) Special Mention 168,290 206,351 95,528 75,338 2,560 1,303 (8) Substandard 220,758 222,405 81,616 78,509 7,612 12,509 (9) Doubtful 6,718 6,712 — — — — Total $ 6,519,953 $ 6,216,606 $ 5,224,382 $ 4,927,145 $ 505,553 $ 508,397
Troubled Debt Restructurings on Financing Receivables	Troubled Debt Restructurings The following table summarizes information for troubled debt restructurings (TDRs): (Dollars in thousands) At June 30, At December 31, 2018 Accrual status $ 136,081 $ 138,479 Non-accrual status 106,986 91,935 Total recorded investment of TDRs $ 243,067 $ 230,414 Specific reserves for TDRs included in the balance of ALLL $ 14,368 $ 11,930 Additional funds committed to borrowers in TDR status 6,160 3,893 For the portion of TDRs deemed to be uncollectible, Webster charged off $4.2 million and $4.5 million for the three months ended June 30, 2019 and 2018 , respectively, and $5.6 million , and $5.2 million for the six months ended June 30, 2019 and 2018 , respectively. The following table provides information on the type of concession for loans and leases modified as TDRs: Three months ended June 30, Six months ended June 30, 2019 2018 2019 2018 Number of Post- (1) Number of Post- (1) Number of Post- (1) Number of Post- (1) (Dollars in thousands) Residential Extended Maturity 3 $ 421 — $ — 4 $ 940 — $ — Maturity/Rate Combined 8 1,397 3 276 13 1,848 3 276 Other (2) 2 281 8 1,685 4 542 13 2,442 Consumer - home equity Extended Maturity 2 225 — — 4 370 2 193 Maturity/Rate Combined 2 110 1 335 2 110 3 448 Other (2) 6 466 14 915 19 1,220 25 1,693 Commercial non - mortgage Extended Maturity 4 69 — — 6 193 3 85 Adjusted Interest Rate 1 100 — — 1 100 — — Maturity/Rate Combined 2 46 2 51 3 71 2 51 Other (2) 4 12,029 7 24,059 19 34,056 9 28,743 Commercial real estate Extended Maturity — — 1 52 — — 2 97 Adjusted Interest rates — — 1 245 — — 1 245 Maturity/Rate Combined — — 1 5,111 — — 1 5,111 Other (2) — — — — 2 2,636 — — Total TDRs 34 $ 15,144 38 $ 32,729 77 $ 42,086 64 $ 39,384 (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, or other concessions. There were no significant amounts of loans and leases modified as TDRs within the previous 12 months and for which there was a payment default for the three and six months ended June 30, 2019 and 2018 . The recorded investment of TDRs in commercial, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: (In thousands) At June 30, 2019 At December 31, 2018 (1) - (6) Pass $ 19,295 $ 13,165 (7) Special Mention 72 84 (8) Substandard 79,482 67,880 (9) Doubtful 6,718 6,610 Total $ 105,567 $ 87,739

Transfers of Financial Assets (

Transfers of Financial Assets (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 676 $ 664 $ 674 $ 872 Provision (benefit) charged to expense 1,813 13 1,820 (190 ) Repurchased loans and settlements charged off (1,805 ) (3 ) (1,810 ) (8 ) Ending balance $ 684 $ 674 $ 684 $ 674 The following table provides a summary of activity in the reserve for unfunded credit commitments: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 2,511 $ 2,294 $ 2,506 $ 2,362 Provision charged to expense 26 302 31 234 Ending balance $ 2,537 $ 2,596 $ 2,537 $ 2,596
Transfer of Financial Assets Accounted for as Sales [Table Text Block]	The following table provides information for mortgage banking activities: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Residential mortgage loans held for sale: Proceeds from sale $ 42,851 $ 45,257 $ 63,464 $ 90,063 Loans sold with servicing rights retained 39,465 39,822 56,813 79,726 Net gain on sale 700 598 858 1,681 Ancillary fees 320 402 581 812 Fair value option adjustment (88 ) 235 257 (114 )
Servicing Asset at Amortized Cost [Table Text Block]	The following table presents the changes in carrying value for mortgage servicing assets: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 19,785 $ 24,403 $ 21,215 $ 25,139 Additions 791 1,038 1,253 2,450 Amortization (1,864 ) (2,100 ) (3,756 ) (4,248 ) Ending balance $ 18,712 $ 23,341 $ 18,712 $ 23,341

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Goodwill and other intangible assets by reportable segment consisted of the following: At June 30, 2019 At December 31, 2018 (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Goodwill: Community Banking $ 516,560 $ 516,560 HSA Bank 21,813 21,813 Total goodwill $ 538,373 $ 538,373 Other intangible assets: HSA Bank - Core deposits $ 22,000 $ (11,957 ) $ 10,043 $ 22,000 $ (10,842 ) $ 11,158 HSA Bank - Customer relationships 21,000 (7,202 ) 13,798 21,000 (6,394 ) 14,606 Total other intangible assets $ 43,000 $ (19,159 ) $ 23,841 $ 43,000 $ (17,236 ) $ 25,764
Schedule Of Expected Amortization Expense, Next Four Years	As of June 30, 2019 , the remaining estimated aggregate future amortization expense for intangible assets is as follows: (In thousands) Remainder of 2019 $ 1,923 2020 3,847 2021 3,847 2022 3,847 2023 3,847 Thereafter 6,530

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2019
Banking and Thrift [Abstract]
Deposit Liabilities, Type [Table Text Block]	A summary of deposits by type follows: (In thousands) At June 30, At December 31, Non-interest-bearing: Demand $ 4,174,806 $ 4,162,446 Interest-bearing: Health savings accounts 6,212,372 5,740,601 Checking 2,636,109 2,518,472 Money market 2,073,006 2,100,084 Savings 4,169,492 4,140,696 Time deposits 3,332,993 3,196,546 Total interest-bearing $ 18,423,972 $ 17,696,399 Total deposits $ 22,598,778 $ 21,858,845 Time deposits and interest-bearing checking, included in above balances, obtained through brokers $ 700,315 $ 869,003 Time deposits, included in above balance, that exceed the FDIC limit 701,839 555,949 Deposit overdrafts reclassified as loan balances 1,114 2,245
Time Deposit Maturities [Table Text Block]	The scheduled maturities of time deposits are as follows: (In thousands) At June 30, Remainder of 2019 $ 1,967,980 2020 961,586 2021 300,299 2022 65,878 2023 29,139 Thereafter 8,111 Total time deposits $ 3,332,993

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The following table summarizes securities sold under agreements to repurchase and other borrowings: At June 30, At December 31, (In thousands) Amount Rate Amount Rate Securities sold under agreements to repurchase (1) : Original maturity of one year or less $ 216,620 0.46 % $ 236,874 0.35 % Original maturity of greater than one year, non-callable 100,000 1.86 — — Total securities sold under agreements to repurchase 316,620 0.90 236,874 0.35 Fed funds purchased 640,300 2.43 345,000 2.52 Securities sold under agreements to repurchase and other borrowings $ 956,920 1.92 $ 581,874 1.64
Federal Home Loan Bank, Advances	The following table provides information for FHLB advances: At June 30, At December 31, (Dollars in thousands) Amount Weighted- Average Contractual Coupon Rate Amount Weighted- Average Contractual Coupon Rate Maturing within 1 year $ 1,078,026 2.37 % $ 1,403,026 2.55 % After 1 but within 2 years 190,000 1.71 215,000 1.73 After 2 but within 3 years 150,000 3.52 200,000 3.16 After 3 but within 4 years 140 — 150 — After 4 but within 5 years 236 2.95 242 2.95 After 5 years 8,254 2.65 8,390 2.65 FHLB advances and overall rate $ 1,426,656 2.40 $ 1,826,808 2.52 Aggregate carrying value of assets pledged as collateral $ 6,379,552 $ 6,689,761 Remaining borrowing capacity 2,633,480 2,568,664
Schedule of Long-term Debt Instruments	The following table summarizes long-term debt: (Dollars in thousands) At June 30, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 $ 150,000 $ 150,000 4.100% Senior fixed-rate notes due March 25, 2029 (1) 315,812 — Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total notes and subordinated debt 543,132 227,320 Discount on senior fixed-rate notes (1,521 ) (608 ) Debt issuance cost on senior fixed-rate notes (3,232 ) (691 ) Long-term debt $ 538,379 $ 226,021 (1) In March 2019, the Company completed a $300.0 million senior fixed-rate notes issuance. The fixed interest rate has been designated in a fair value hedging relationship and swapped to a weighted-average variable rate of 4.01% at June 30, 2019 . The $15.8 million basis adjustment included in the carrying value reflects the changes in the benchmark rate. (2) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month London Interbank Offered Rate plus 2.95% , was 5.36% at June 30, 2019 and 5.74% at December 31, 2018 .

Leases Leases (Tables)

Leases Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Schedule of Components of Leveraged Lease Investments [Table Text Block]	The following table summarizes lessee information related to the Company’s operating ROU assets and lease liability: At June 30, 2019 (In thousands) Operating Leases Consolidated Balance Sheet Line Item Location ROU lease assets $ 158,270 Premises and equipment, net Lease liabilities 178,724 Accrued expenses and other liabilities
Lease, Cost [Table Text Block]	The components of operating lease cost and other related information are as follows: Three months ended June 30, 2019 Six months ended June 30, 2019 (In thousands) Lease Cost: Operating lease costs $ 7,487 $ 14,872 Variable lease costs 1,068 2,321 Sublease income (155 ) (295 ) Total operating lease cost $ 8,400 $ 16,898 Other Information: Cash paid for amounts included in the measurement of lease liabilities $ 7,738 $ 15,411 Right-of-use assets obtained in exchange for new operating lease liabilities 6,296 12,934 Weighted-average remaining lease term, in years - operating leases at June 30, 2019 8.2 Weighted-average discount rate - operating leases at June 30, 2019 3.44 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The undiscounted scheduled maturities reconciled to total operating lease liabilities are as follows: (In thousands) At June 30, 2019 Remainder of 2019 $ 13,436 2020 31,178 2021 29,578 2022 25,857 2023 22,812 Thereafter 86,089 Total operating lease liability payments 208,950 Less: Present value adjustment 30,226 Lease liabilities $ 178,724

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss, Net of Tax (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss by Component	The following tables summarize the changes in accumulated other comprehensive loss, net of tax (AOCL) by component: Three months ended June 30, 2019 Six months ended June 30, 2019 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ (43,815 ) $ (9,117 ) $ (48,909 ) $ (101,841 ) $ (71,374 ) $ (9,313 ) $ (49,965 ) $ (130,652 ) OCI (OCL) before reclassifications 34,409 (870 ) — 33,539 61,968 (1,709 ) — 60,259 Amounts reclassified from AOCL — 1,056 1,056 2,112 — 2,091 2,112 4,203 Net current-period OCI 34,409 186 1,056 35,651 61,968 382 2,112 64,462 Ending balance $ (9,406 ) $ (8,931 ) $ (47,853 ) $ (66,190 ) $ (9,406 ) $ (8,931 ) $ (47,853 ) $ (66,190 ) Three months ended June 30, 2018 Six months ended June 30, 2018 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ (55,371 ) $ (12,494 ) $ (47,614 ) $ (115,479 ) $ (27,947 ) $ (15,016 ) $ (48,568 ) $ (91,531 ) (OCL)/OCI before reclassifications (9,246 ) 294 — (8,952 ) (36,670 ) 1,423 — (35,247 ) Amounts reclassified from AOCL — 1,386 1,109 2,495 — 2,779 2,063 4,842 Net current-period (OCL)/OCI (9,246 ) 1,680 1,109 (6,457 ) (36,670 ) 4,202 2,063 (30,405 ) Ending balance $ (64,617 ) $ (10,814 ) $ (46,505 ) $ (121,936 ) $ (64,617 ) $ (10,814 ) $ (46,505 ) $ (121,936 )
Schedule of Accumulated Other Comprehensive Loss	The following tables provide information for the items reclassified from AOCL: (In thousands) Three months ended June 30, Six months ended June 30, Associated Line Item in the Condensed Consolidated Statements of Income AOCL Components 2019 2018 2019 2018 Derivative instruments: Cash flow hedges $ (1,408 ) $ (1,861 ) $ (2,799 ) $ (3,732 ) Interest expense Cash flow hedges (12 ) — (12 ) — Interest income Tax benefit 364 475 720 953 Income tax expense Net of tax $ (1,056 ) $ (1,386 ) $ (2,091 ) $ (2,779 ) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,429 ) $ (1,493 ) $ (2,859 ) $ (2,778 ) (1) Tax benefit 373 384 747 715 Income tax expense Net of tax $ (1,056 ) $ (1,109 ) $ (2,112 ) $ (2,063 ) (1) These AOCL components are included in the computation of net periodic benefit cost, see Note 15: Retirement Benefit Plans for further details.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Information On The Capital Ratios	The following table provides information on the capital ratios for Webster Financial Corporation and Webster Bank: At June 30, 2019 Actual Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,401,959 11.41 % $ 947,715 4.5 % $ 1,368,922 6.5 % Total risk-based capital 2,838,524 13.48 1,684,827 8.0 2,106,034 10.0 Tier 1 risk-based capital 2,546,996 12.09 1,263,620 6.0 1,684,827 8.0 Tier 1 leverage capital 2,546,996 9.09 1,120,243 4.0 1,400,303 5.0 Webster Bank CET1 risk-based capital $ 2,574,538 12.23 % $ 947,077 4.5 % $ 1,368,000 6.5 % Total risk-based capital 2,788,746 13.25 1,683,692 8.0 2,104,615 10.0 Tier 1 risk-based capital 2,574,538 12.23 1,262,769 6.0 1,683,692 8.0 Tier 1 leverage capital 2,574,538 9.20 1,119,896 4.0 1,399,871 5.0 At December 31, 2018 Actual Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,284,978 11.44 % $ 898,972 4.5 % $ 1,298,514 6.5 % Total risk-based capital 2,722,194 13.63 1,598,172 8.0 1,997,715 10.0 Tier 1 risk-based capital 2,430,015 12.16 1,198,629 6.0 1,598,172 8.0 Tier 1 leverage capital 2,430,015 9.02 1,077,303 4.0 1,346,628 5.0 Webster Bank CET1 risk-based capital $ 2,170,566 10.87 % $ 898,317 4.5 % $ 1,297,569 6.5 % Total risk-based capital 2,385,425 11.95 1,597,008 8.0 1,996,260 10.0 Tier 1 risk-based capital 2,170,566 10.87 1,197,756 6.0 1,597,008 8.0 Tier 1 leverage capital 2,170,566 8.06 1,076,712 4.0 1,345,889 5.0

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30, Six Months Ended June 30, (In thousands, except per share data) 2019 2018 2019 2018 Earnings for basic and diluted earnings per common share: Net income $ 98,649 $ 81,682 $ 198,385 $ 161,907 Less: Preferred stock dividends 1,969 1,969 3,938 3,916 Net income available to common shareholders 96,680 79,713 194,447 157,991 Less: Earnings applicable to participating restricted stock 487 224 964 418 Earnings applicable to common shareholders $ 96,193 $ 79,489 $ 193,483 $ 157,573 Shares: Weighted-average common shares outstanding - basic 91,534 91,893 91,550 91,913 Effect of dilutive securities 321 280 348 323 Weighted-average common shares outstanding - diluted 91,855 92,173 91,898 92,236 Earnings per common share: Basic $ 1.05 $ 0.87 $ 2.11 $ 1.71 Diluted 1.05 0.86 2.11 1.71

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
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 value of derivative positions: At June 30, 2019 At December 31, 2018 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 (2) $ 825,000 $ 4,515 $ — $ — $ 325,000 $ 3,050 $ — $ — Not designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives (2) 1,398,175 1,578 2,905,312 9,617 2,767,518 6,570 1,276,109 2,012 Mortgage banking derivatives (3) 42,284 374 46,073 399 13,599 226 17,000 293 Other 13,124 111 53,318 599 11,952 308 43,097 553 Positions not subject to a master netting agreement Interest rate derivatives 3,084,348 135,374 1,218,947 3,250 1,668,012 35,635 2,367,876 36,017 RPAs 64,382 88 101,565 137 64,974 39 96,296 81 Other 6,550 393 709 43 8,506 450 1,208 54 Total not designated as hedging instruments 4,608,863 137,918 4,325,924 14,045 4,534,561 43,228 3,801,586 39,010 Gross derivative instruments, before netting $ 5,433,863 142,433 $ 4,325,924 14,045 $ 4,859,561 46,278 $ 3,801,586 39,010 Less: Legally enforceable master netting agreements 2,367 2,367 2,495 2,495 Less: Cash collateral posted/received 1,505 5,304 4,936 — Total derivative instruments, after netting (4) $ 138,561 $ 6,374 $ 38,847 $ 36,515 (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) Balances related to CME are presented as a single unit of account. Notional amounts of interest rate swaps cleared through CME include $0.9 billion and $1.9 billion for asset derivatives and $2.6 billion and $1.1 billion for liability derivatives at June 30, 2019 and December 31, 2018, respectively. The related fair values approximate zero . (3) Notional amounts include mandatory forward commitments of $45.0 million , while notional amounts do not include approved floating rate commitments of $12.3 million , at June 30, 2019 .
Other Derivatives Not Designated For Hedge Accounting	Three months ended June 30, Six months ended June 30, (In thousands) Recognized In 2019 2018 2019 2018 Interest rate derivatives Other non-interest income $ 4,071 $ 1,958 $ 5,122 $ 5,749 Mortgage banking derivatives Mortgage banking activities 157 (134 ) (251 ) (69 ) Other Other non-interest income (591 ) 2,024 (76 ) 1,434 Total not designated as hedging instruments $ 3,637 $ 3,848 $ 4,795 $ 7,114
Offsetting Liabilities	Non-cleared derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral. Cash collateral received, in the amount of $1.5 million , is included in cash and due from banks and is considered restricted in nature. Net gain positions are recorded as assets and are included in accrued interest receivable and other assets, while, net loss positions are recorded as liabilities and are included in accrued expenses and other liabilities, in the consolidated balance sheet. The following table presents the transition from a gross basis to net basis, due to the application of counterparty netting agreements: At June 30, 2019 At December 31, 2018 (In thousands) Gross Amount Relationship Offset Cash Collateral Offset Net Amount Gross Amount Relationship Offset Cash Collateral Offset Net Amount Derivative instrument gains: Hedge accounting $ 4,515 $ 970 $ 1,505 $ 2,040 $ 3,050 $ 88 $ 567 $ 2,395 Non-hedge accounting 2,063 1,397 — 666 6,878 2,407 4,369 102 Total assets $ 6,578 $ 2,367 $ 1,505 $ 2,706 $ 9,928 $ 2,495 $ 4,936 $ 2,497 Derivative instrument losses: Hedge accounting $ — $ — $ — $ — $ — $ — $ — $ — Non-hedge accounting 10,615 2,367 5,304 2,944 2,566 2,495 — 71 Total liabilities $ 10,615 $ 2,367 $ 5,304 $ 2,944 $ 2,566 $ 2,495 $ — $ 71
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table presents the change in fair value for derivatives designated as fair value hedges as well as the offsetting change in fair value on the hedged item, and the effect on the income statement for derivatives designated as cash flow hedges: Three months ended June 30, Six months ended June 30, (In thousands) Recognized In 2019 2018 2019 2018 Fair value hedges: Recognized on derivatives Interest expense $ 14,184 $ — $ 15,812 $ — Recognized on hedged items Interest expense (14,184 ) — (15,812 ) — Net recognized on fair value hedges $ — $ — $ — $ — Cash flow hedges: Interest rate derivatives Interest expense $ 980 $ 1,668 $ 1,933 $ 3,491 Interest rate derivatives Interest income 12 — 12 — Net recognized on cash flow hedges $ 992 $ 1,668 $ 1,945 $ 3,491 Additional information related to fair value hedges: Consolidated Balance Sheet Line Item in Which Hedged Item is Located Carrying Amount of Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount At June 30, At June 30, (In thousands) 2019 2018 2019 2018 Long-term debt $ 315,812 $ — $ 15,812 $ —
Derivative Financial Instruments	Derivative Financial Instruments Risk Management Objective of Using Derivatives Webster manages economic risks, such as interest rate, liquidity, and credit risks by managing the amount, sources, and duration of its debt funding in conjunction with the use of interest rate derivative financial instruments. Webster enters into interest rate derivatives to mitigate the exposure related to business activities that result in the future receipt or payment of, both known and uncertain, cash amounts that are impacted by interest rates. The primary objective for using interest rate derivatives is to add stability to interest expense by managing exposure to interest rate movements. To accomplish this objective, Webster uses interest rate swaps and interest rate caps or floors as part of its interest rate risk management strategy. Interest rate swaps and interest rate caps and floors 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, while interest rate floors designated as cash flow hedges involve the receipt of variable amounts from a counterparty if interest rates fall below the strike rate on the contract in exchange for payment of an up-front premium. Cash flow hedges are used to regulate the variable cash flows associated with existing variable-rate debt and forecasted issuances of debt. Derivative instruments designated as cash flow hedges are recorded on the consolidated balance sheet at fair value. Changes in fair value of the derivatives which are designated as cash flow hedges, and that qualify for hedge accounting, are recorded to AOCL and are reclassified into earnings in the subsequent periods that the hedged forecasted transaction affects earnings. Fair value hedges are used for certain fixed-rate obligations which can be exposed to a change in fair value attributable to changes in benchmark interest rates. An interest rate swap which involves the receipt of fixed-rate amounts from a counterparty in exchange for Webster making variable-rate payments over the life of the agreement, without the exchange of the underlying notional amount, is typically utilized. 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 risk hedged, is recognized in interest expense in the consolidated income statement. Additionally, in order to address certain other risk management matters, the Company also utilizes derivative instruments that do not qualify for hedge accounting. These derivative instruments, which are recorded on the consolidated balance sheet at fair value, with changes in fair value recognized each period as other non-interest income in the consolidated income statement, are described in the following paragraphs. Interest rate derivative contracts are 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, which results in minimal impact on earnings, except for fee income earned in such transactions. All contracts eligible for clearing are cleared through Chicago Mercantile Exchange (CME). In accordance with its amended rulebook, CME legally characterizes variation margin payments made to and received from CME as settlement of derivatives rather than as collateral against derivatives. Risk participation agreements (RPAs) are entered into as financial guarantees of performance on interest rate swap derivatives. The purchased (asset) or sold (liability) guarantee allows the Company to participate-in (fee received) or participate-out (fee paid) the risk associated with certain derivative positions executed with the borrower by the lead bank in a loan syndication. Other derivatives include foreign currency forward contracts related to lending arrangements and customer hedging activity, a VISA equity swap transaction, and mortgage banking derivatives such as mortgage-backed securities related to residential loan commitments and loans held for sale. Mortgage banking derivatives 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, or 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 mortgage-backed securities. Mandatory forward commitments 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 following table presents the notional amounts and fair value of derivative positions: At June 30, 2019 At December 31, 2018 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 (2) $ 825,000 $ 4,515 $ — $ — $ 325,000 $ 3,050 $ — $ — Not designated as hedging instruments: Positions subject to a master netting agreement (1) Interest rate derivatives (2) 1,398,175 1,578 2,905,312 9,617 2,767,518 6,570 1,276,109 2,012 Mortgage banking derivatives (3) 42,284 374 46,073 399 13,599 226 17,000 293 Other 13,124 111 53,318 599 11,952 308 43,097 553 Positions not subject to a master netting agreement Interest rate derivatives 3,084,348 135,374 1,218,947 3,250 1,668,012 35,635 2,367,876 36,017 RPAs 64,382 88 101,565 137 64,974 39 96,296 81 Other 6,550 393 709 43 8,506 450 1,208 54 Total not designated as hedging instruments 4,608,863 137,918 4,325,924 14,045 4,534,561 43,228 3,801,586 39,010 Gross derivative instruments, before netting $ 5,433,863 142,433 $ 4,325,924 14,045 $ 4,859,561 46,278 $ 3,801,586 39,010 Less: Legally enforceable master netting agreements 2,367 2,367 2,495 2,495 Less: Cash collateral posted/received 1,505 5,304 4,936 — Total derivative instruments, after netting (4) $ 138,561 $ 6,374 $ 38,847 $ 36,515 (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) Balances related to CME are presented as a single unit of account. Notional amounts of interest rate swaps cleared through CME include $0.9 billion and $1.9 billion for asset derivatives and $2.6 billion and $1.1 billion for liability derivatives at June 30, 2019 and December 31, 2018, respectively. The related fair values approximate zero . (3) Notional amounts include mandatory forward commitments of $45.0 million , while notional amounts do not include approved floating rate commitments of $12.3 million , at June 30, 2019 . (4) Fair value of assets are included in accrued interest receivable and other assets, while, fair value of liabilities are included in accrued expenses and other liabilities, in the consolidated balance sheet. The following table presents the change in fair value for derivatives designated as fair value hedges as well as the offsetting change in fair value on the hedged item, and the effect on the income statement for derivatives designated as cash flow hedges: Three months ended June 30, Six months ended June 30, (In thousands) Recognized In 2019 2018 2019 2018 Fair value hedges: Recognized on derivatives Interest expense $ 14,184 $ — $ 15,812 $ — Recognized on hedged items Interest expense (14,184 ) — (15,812 ) — Net recognized on fair value hedges $ — $ — $ — $ — Cash flow hedges: Interest rate derivatives Interest expense $ 980 $ 1,668 $ 1,933 $ 3,491 Interest rate derivatives Interest income 12 — 12 — Net recognized on cash flow hedges $ 992 $ 1,668 $ 1,945 $ 3,491 Additional information related to fair value hedges: Consolidated Balance Sheet Line Item in Which Hedged Item is Located Carrying Amount of Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount At June 30, At June 30, (In thousands) 2019 2018 2019 2018 Long-term debt $ 315,812 $ — $ 15,812 $ — The following table presents the effect on the income statement for derivatives not designated as hedging instruments: Three months ended June 30, Six months ended June 30, (In thousands) Recognized In 2019 2018 2019 2018 Interest rate derivatives Other non-interest income $ 4,071 $ 1,958 $ 5,122 $ 5,749 Mortgage banking derivatives Mortgage banking activities 157 (134 ) (251 ) (69 ) Other Other non-interest income (591 ) 2,024 (76 ) 1,434 Total not designated as hedging instruments $ 3,637 $ 3,848 $ 4,795 $ 7,114 Amounts for the change in the fair value of derivatives qualifying for cash flow hedge accounting treatment are recorded to AOCL and reclassified to interest expense as interest payments are made on Webster's variable-rate debt. Over the next twelve months, an estimated $1.9 million will be reclassified from AOCL as a reduction to interest expense. Amounts for gains and losses related to hedge terminations are also recorded to AOCL and subsequently amortized into interest expense over the respective terms of the hedged debt instruments. Over the next twelve months, an estimated $3.2 million will be reclassified from AOCL as an increase to interest expense. At June 30, 2019 , the remaining unamortized loss on the termination of cash flow hedges is $6.7 million and the maximum length of time over which forecasted transactions are hedged is 9.5 years. Additional information about cash flow hedge activity impacting AOCL, and the related amounts reclassified to interest expense is provided in Note 10: Accumulated Other Comprehensive Loss, Net of Tax . Information about the valuation methods used to measure the fair value of derivatives is provided in Note 14: Fair Value Measurements . Offsetting Derivatives Non-cleared derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral. Cash collateral received, in the amount of $1.5 million , is included in cash and due from banks and is considered restricted in nature. Net gain positions are recorded as assets and are included in accrued interest receivable and other assets, while, net loss positions are recorded as liabilities and are included in accrued expenses and other liabilities, in the consolidated balance sheet. The following table presents the transition from a gross basis to net basis, due to the application of counterparty netting agreements: At June 30, 2019 At December 31, 2018 (In thousands) Gross Amount Relationship Offset Cash Collateral Offset Net Amount Gross Amount Relationship Offset Cash Collateral Offset Net Amount Derivative instrument gains: Hedge accounting $ 4,515 $ 970 $ 1,505 $ 2,040 $ 3,050 $ 88 $ 567 $ 2,395 Non-hedge accounting 2,063 1,397 — 666 6,878 2,407 4,369 102 Total assets $ 6,578 $ 2,367 $ 1,505 $ 2,706 $ 9,928 $ 2,495 $ 4,936 $ 2,497 Derivative instrument losses: Hedge accounting $ — $ — $ — $ — $ — $ — $ — $ — Non-hedge accounting 10,615 2,367 5,304 2,944 2,566 2,495 — 71 Total liabilities $ 10,615 $ 2,367 $ 5,304 $ 2,944 $ 2,566 $ 2,495 $ — $ 71 Derivative Exposure Use of derivative contracts may expose Webster Bank to counterparty credit risk. The Company has International Swaps and Derivatives Association Master Agreements, including a Credit Support Annex, with all derivative counterparties. In accordance with counterparty credit agreements and derivative clearing rules, cash or securities are posted or received on a daily basis to offset counterparty derivative exposure. Remaining exposure is collateralized by securities received. In the event of default and if the collateral is not returned, the exposure would be offset by terminating the transaction. The Company had approximately $119.5 million in net margin collateral posted with financial counterparties or the derivative clearing organization at June 30, 2019 , which is primarily comprised of $40.4 million in initial margin posted at CME and $74.8 million in CME variation margin posted . The Company regularly evaluates the credit risk of its derivative customers, taking into account the likelihood of default, net exposures, and remaining contractual life, among other related factors. Credit risk exposure is mitigated as transactions with customers are generally secured by the same collateral of the underlying transactions being hedged. The net current credit exposure relating to interest rate derivatives with Webster Bank customers was $135.4 million at June 30, 2019 . 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 $35.6 million at June 30, 2019 .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Option, Disclosures	The following table presents the fair value, unpaid principal balance, and accrual status, of assets accounted for under the fair value option: At June 30, 2019 At December 31, 2018 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 19,249 $ 19,017 $ 232 $ 7,908 $ 8,227 $ (319 ) Electing to measure originated loans held for sale at fair value reduces certain timing differences and better matches changes in the value of these assets with changes in the value of the derivatives used as an economic hedge on these assets.
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 June 30, 2019 (In thousands) Level 1 Level 2 Level 3 NAV Total Financial assets held at fair value: U.S. Treasury Bills $ 9,998 $ — $ — $ — $ 9,998 Agency CMO — 214,252 — — 214,252 Agency MBS — 1,619,472 — — 1,619,472 Agency CMBS — 578,701 — — 578,701 CMBS — 429,068 — — 429,068 CLO — 96,389 — — 96,389 Corporate debt — 30,777 — — 30,777 Total available-for-sale investment securities 9,998 2,968,659 — — 2,978,657 Gross derivative instruments, before netting (1) 504 141,929 — — 142,433 Originated loans held for sale — 19,249 — — 19,249 Investments held in Rabbi Trust 4,649 — — — 4,649 Alternative investments — — — 2,990 2,990 Total financial assets held at fair value $ 15,151 $ 3,129,837 $ — $ 2,990 $ 3,147,978 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 620 $ 13,425 $ — $ — $ 14,045 At December 31, 2018 (In thousands) Level 1 Level 2 Level 3 NAV Total Financial assets held at fair value: U.S. Treasury Bills $ 7,550 $ — $ — $ — $ 7,550 Agency CMO — 234,923 — — 234,923 Agency MBS — 1,481,089 — — 1,481,089 Agency CMBS — 566,237 — — 566,237 CMBS — 445,581 — — 445,581 CLO — 112,771 — — 112,771 Corporate debt — 50,579 — — 50,579 Total available-for-sale investment securities 7,550 2,891,180 — — 2,898,730 Gross derivative instruments, before netting (1) 758 45,520 — — 46,278 Originated loans held for sale — 7,908 — — 7,908 Investments held in Rabbi Trust 4,307 — — — 4,307 Alternative investments — — — 2,563 2,563 Total financial assets held at fair value $ 12,615 $ 2,944,608 $ — $ 2,563 $ 2,959,786 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 588 $ 38,422 $ — $ — $ 39,010 (1) For information relating to the impact of netting derivative assets and derivative liabilities as well as the impact from offsetting cash collateral paid to the same derivative counterparties see Note 13: Derivative Financial Instruments .
Summary Of Estimated Fair Values Of Significant Financial Instruments	The estimated fair values of selected financial instruments and servicing assets are as follows: At June 30, 2019 At December 31, 2018 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Assets: Level 2 Held-to-maturity investment securities $ 4,636,707 $ 4,674,510 $ 4,325,420 $ 4,209,121 Level 3 Loans and leases, net 19,058,212 19,184,264 18,253,136 18,155,798 Mortgage servicing assets 18,712 36,572 21,215 45,478 Liabilities: Level 2 Deposit liabilities $ 19,265,785 $ 19,265,785 $ 18,662,299 $ 18,662,299 Time deposits 3,332,993 3,334,113 3,196,546 3,175,948 Securities sold under agreements to repurchase and other borrowings 956,920 954,844 581,874 581,874 FHLB advances 1,426,656 1,429,684 1,826,808 1,826,381 Long-term debt (1) 538,379 553,287 226,021 229,306 (1) Adjustments to the carrying amount of long-term debt for unamortized discount and debt issuance cost on senior fixed-rate notes are not included for determination of fair value, see Note 8: Borrowings .

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Summary of Net Periodic Benefit Cost	The following table summarizes the components of net periodic benefit cost: Three months ended June 30, 2019 2018 (In thousands) Pension Plan SERP Other Benefits Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 1,977 $ 16 $ 21 $ 1,935 $ (21 ) $ 19 Expected return on plan assets (2,815 ) — — (3,180 ) — — Recognized net loss 1,430 3 (4 ) 1,160 333 — Net periodic benefit cost $ 592 $ 19 $ 17 $ (85 ) $ 312 $ 19 Six months ended June 30, 2019 2018 (In thousands) Pension Plan SERP Other Benefits Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 3,955 $ 32 $ 42 $ 3,720 $ 166 $ 39 Expected return on plan assets (5,630 ) — — (6,360 ) — — Recognized net loss 2,860 7 (8 ) 2,320 458 — Net periodic benefit cost $ 1,185 $ 39 $ 34 $ (320 ) $ 624 $ 39

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Operating Results And Total Assets Reportable Segments	The following table presents total assets for Webster's reportable segments and the Corporate and Reconciling category: (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total At June 30, 2019 $ 11,061,635 $ 82,232 $ 9,059,657 $ 8,738,519 $ 28,942,043 At December 31, 2018 10,477,050 70,826 8,727,335 8,335,104 27,610,315 The following tables present the operating results, including all appropriate allocations, for Webster’s reportable segments and the Corporate and Reconciling category: Three months ended June 30, 2019 (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 92,171 $ 42,626 $ 102,699 $ 4,291 $ 241,787 Provision for loan and lease losses 7,741 — 4,159 — 11,900 Net interest income (expense) after provision for loan and lease losses 84,430 42,626 98,540 4,291 229,887 Non-interest income 14,645 24,979 27,675 8,554 75,853 Non-interest expense 46,196 34,253 96,166 4,025 180,640 Income before income tax expense 52,879 33,352 30,049 8,820 125,100 Income tax expense (benefit) 13,008 8,672 5,980 (1,209 ) 26,451 Net income $ 39,871 $ 24,680 $ 24,069 $ 10,029 $ 98,649 Three months ended June 30, 2018 (In thousands) Commercial Banking HSA Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 88,459 $ 35,265 $ 101,902 $ (616 ) $ 225,010 Provision (benefit) for loan and lease losses 8,630 — 1,870 — 10,500 Net interest income (expense) after provision for loan and lease losses 79,829 35,265 100,032 (616 ) 214,510 Non-interest income 15,041 22,882 26,378 4,073 68,374 Non-interest expense 42,979 31,220 95,197 11,063 180,459 Income (loss) before income tax expense 51,891 26,927 31,213 (7,606 ) 102,425 Income tax expense (benefit) 12,765 7,001 6,211 (5,234 ) 20,743 Net income (loss) $ 39,126 $ 19,926 $ 25,002 $ (2,372 ) $ 81,682 Six months ended June 30, 2019 (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 182,681 $ 84,367 $ 204,059 $ 12,231 $ 483,338 Provision for loan and lease losses 13,982 — 6,518 — 20,500 Net interest income (expense) after provision for loan and lease losses 168,699 84,367 197,541 12,231 462,838 Non-interest income 28,656 50,556 53,057 12,196 144,465 Non-interest expense 90,814 67,775 191,241 6,496 356,326 Income before income tax expense 106,541 67,148 59,357 17,931 250,977 Income tax expense (benefit) 26,209 17,459 11,812 (2,888 ) 52,592 Net income $ 80,332 $ 49,689 $ 47,545 $ 20,819 $ 198,385 Six months ended June 30, 2018 (In thousands) Commercial Banking HSA Bank Community Banking Corporate and Reconciling Consolidated Total Net interest income (expense) $ 173,110 $ 68,189 $ 200,830 $ (2,951 ) $ 439,178 Provision for loan and lease losses 15,477 — 6,023 — 21,500 Net interest income (expense) after provision for loan and lease losses 157,633 68,189 194,807 (2,951 ) 417,678 Non-interest income 30,357 45,551 51,573 9,640 137,121 Non-interest expense 84,224 62,735 192,026 13,089 352,074 Income (loss) before income tax expense 103,766 51,005 54,354 (6,400 ) 202,725 Income tax expense (benefit) 25,527 13,261 10,816 (8,786 ) 40,818 Net income $ 78,239 $ 37,744 $ 43,538 $ 2,386 $ 161,907

Revenue from Contracts with C_2

Revenue from Contracts with Customers Disaggregation of Revenue (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following tables present revenues within the scope of ASC 606, Revenue from Contracts with Customers and the net amount of other sources of non-interest income that is within the scope of other GAAP topics: Three months ended June 30, 2019 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 3,085 $ 23,704 $ 16,289 $ 40 $ 43,118 Wealth and investment services 2,542 — 5,776 (9 ) 8,309 Other — 1,275 704 — 1,979 Revenue from contracts with customers 5,627 24,979 22,769 31 53,406 Other sources of non-interest income 9,018 — 4,906 8,523 22,447 Total non-interest income $ 14,645 $ 24,979 $ 27,675 $ 8,554 $ 75,853 Three months ended June 30, 2018 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 3,180 $ 22,006 $ 15,663 $ 10 $ 40,859 Wealth and investment services 2,587 — 5,878 (9 ) 8,456 Other — 876 640 — 1,516 Revenue from contracts with customers 5,767 22,882 22,181 1 50,831 Other sources of non-interest income 9,274 — 4,197 4,072 17,543 Total non-interest income $ 15,041 $ 22,882 $ 26,378 $ 4,073 $ 68,374 Six months ended June 30, 2019 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 6,121 $ 48,232 $ 31,654 $ 135 $ 86,142 Wealth and investment services 5,026 — 10,951 (17 ) 15,960 Other — 2,324 1,205 — 3,529 Revenue from contracts with customers 11,147 50,556 43,810 118 105,631 Other sources of non-interest income 17,509 — 9,247 12,078 38,834 Total non-interest income $ 28,656 $ 50,556 $ 53,057 $ 12,196 $ 144,465 Six months ended June 30, 2018 (In thousands) Commercial HSA Community Corporate and Consolidated Non-interest Income Deposit service fees $ 6,402 $ 43,818 $ 30,972 $ 118 $ 81,310 Wealth and investment services 5,126 — 11,217 (17 ) 16,326 Other — 1,733 1,133 — 2,866 Revenue from contracts with customers 11,528 45,551 43,322 101 100,502 Other sources of non-interest income 18,829 — 8,251 9,539 36,619 Total non-interest income $ 30,357 $ 45,551 $ 51,573 $ 9,640 $ 137,121

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30 At December 31, 2018 Commitments to extend credit $ 6,107,450 $ 5,840,585 Standby letter of credit 189,890 189,040 Commercial letter of credit 22,837 21,181 Total credit-related financial instruments with off-balance sheet risk $ 6,320,177 $ 6,050,806
Reserve For Unfunded Credit Commitments	The following table provides a summary of activity in the reserve for loan repurchases: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 676 $ 664 $ 674 $ 872 Provision (benefit) charged to expense 1,813 13 1,820 (190 ) Repurchased loans and settlements charged off (1,805 ) (3 ) (1,810 ) (8 ) Ending balance $ 684 $ 674 $ 684 $ 674 The following table provides a summary of activity in the reserve for unfunded credit commitments: Three months ended June 30, Six months ended June 30, (In thousands) 2019 2018 2019 2018 Beginning balance $ 2,511 $ 2,294 $ 2,506 $ 2,362 Provision charged to expense 26 302 31 234 Ending balance $ 2,537 $ 2,596 $ 2,537 $ 2,596

Summary of Significant Accoun_3

Summary of Significant Accounting Policies New Accounting Pronouncements or Change in Accounting Principle (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 158,270	$ 157,234	$ 0
Operating Lease, Liability	178,724	178,208	$ 0
ASU No. 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 500
Operating Lease, Right-of-Use Asset		157,200
Operating Lease, Liability		$ 178,200

Variable Interest Entities (Var

Variable Interest Entities (Variable Interest Entity, Consolidated, Carrying Amount, Assets) (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Other Assets [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 37.8	$ 29.1
Accounts Payable and Accrued Liabilities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	15	10.4
Other Investments [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	20.9	17.6
Unfunded Loan Commitment [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 35.5	$ 31

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 2,990,650	$ 2,994,616
Unrealized Gains	22,199	2,783
Unrealized Losses	(34,192)	(98,669)
Fair Value	2,978,657	2,898,730
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	4,636,707	4,325,420
Unrealized Gains	64,197	11,902
Unrealized Losses	(26,394)	(128,201)
Fair Value	4,674,510	4,209,121
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	9,997	7,549
Unrealized Gains	1	1
Unrealized Losses	0	0
Fair Value	9,998	7,550
Agency CMO [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	213,307	238,968
Unrealized Gains	2,209	412
Unrealized Losses	(1,264)	(4,457)
Fair Value	214,252	234,923
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	190,858	208,113
Unrealized Gains	1,089	287
Unrealized Losses	(1,406)	(5,255)
Fair Value	190,541	203,145
Agency MBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,612,028	1,521,534
Unrealized Gains	19,109	1,631
Unrealized Losses	(11,665)	(42,076)
Fair Value	1,619,472	1,481,089
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	2,736,676	2,517,823
Unrealized Gains	33,098	8,250
Unrealized Losses	(20,616)	(79,701)
Fair Value	2,749,158	2,446,372
Agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	594,548	608,167
Unrealized Gains	175	0
Unrealized Losses	(16,022)	(41,930)
Fair Value	578,701	566,237
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	768,076	667,500
Unrealized Gains	3,988	53
Unrealized Losses	(3,684)	(22,572)
Fair Value	768,380	644,981
Non-agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	428,492	447,897
Unrealized Gains	599	645
Unrealized Losses	(23)	(2,961)
Fair Value	429,068	445,581
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	194,752	216,943
Unrealized Gains	2,549	405
Unrealized Losses	(37)	(2,388)
Fair Value	197,264	214,960
CLO [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	96,727	114,641
Unrealized Gains	106	94
Unrealized Losses	(444)	(1,964)
Fair Value	96,389	112,771
Corporate debt securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	35,551	55,860
Unrealized Gains	0	0
Unrealized Losses	(4,774)	(5,281)
Fair Value	30,777	50,579
Municipal bonds and notes [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	746,345	715,041
Unrealized Gains	23,473	2,907
Unrealized Losses	(651)	(18,285)
Fair Value	$ 769,167	$ 699,663

Investment Securities (Other Th

Investment Securities (Other Than Temporary Impairment Credit Losses Recognized In Earnings) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning Balance OTTI	$ 822	$ 1,364	$ 822	$ 1,364
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	(261)	0	(261)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 822	$ 1,364	$ 822	$ 1,364	$ 822	$ 1,103

Investment Securities (Summar_2

Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Detail) $ in Thousands	Jun. 30, 2019USD ($)holding	Dec. 31, 2018USD ($)holding
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 71,812	$ 799,954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,204)	(8,602)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,439,632	1,756,617
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (32,988)	$ (90,067)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	187	309
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,511,444	$ 2,556,571
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(34,192)	(98,669)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,560	382,558
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	(3,069)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,975,874	3,257,871
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (26,391)	$ (125,132)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	251	596
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 1,979,434	$ 3,640,429
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(26,394)	(128,201)
Agency CMO [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6	15,524
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(72)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	83,924	180,641
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,264)	$ (4,385)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	11	36
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 83,930	$ 196,165
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,264)	(4,457)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	210	691
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	84,453	182,396
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,406)	$ (5,254)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	11	25
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 84,663	$ 183,087
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(1,406)	(5,255)
Agency MBS [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		321,678
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(2,078)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	748,498	975,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (11,665)	$ (39,998)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	123	184
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 748,498	$ 1,296,762
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(11,665)	(42,076)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		288,635
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(1,916)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,268,211	1,892,951
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (20,616)	$ (77,785)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	166	272
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 1,268,211	$ 2,181,586
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(20,616)	(79,701)
Agency CMBS [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	542,244	566,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (16,022)	$ (41,930)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	34	37
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 542,244	$ 566,237
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(16,022)	(41,930)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	536,755	635,284
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3,684)	$ (22,572)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	44	56
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 536,755	$ 635,284
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(3,684)	(22,572)
Non-agency CMBS [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	45,740	343,457
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(22)	(2,937)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,000	5,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1)	$ (24)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	10	39
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 62,740	$ 348,650
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(23)	(2,961)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,350	24,881
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	(270)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	22,386	132,464
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (34)	$ (2,118)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	5	20
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 25,736	$ 157,345
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(37)	(2,388)
CLO [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	18,380	83,305
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(320)	(1,695)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	24,875	14,873
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (124)	$ (269)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	2	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 43,255	$ 98,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(444)	(1,964)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	7,686	35,990
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(862)	(1,820)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	23,091	14,589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3,912)	$ (3,461)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	7	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 30,777	$ 50,579
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,774)	(5,281)
Municipal bonds and notes [Member]
Schedule of Investments [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		68,351
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(882)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	64,069	414,776
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (651)	$ (17,403)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | holding	25	223
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 64,069	$ 483,127
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (651)	$ (18,285)

Investment Securities (Summar_3

Investment Securities (Summary Of Debt Securities By Contractual Maturity) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Due in one year or less	$ 9,997
Available-for-sale, Amortized Cost - Due after one year through five years	17,000
Available-for-sale, Amortized Cost - Due after five through ten years	308,645
Available-for-sale, Amortized Cost - Due after ten years	2,655,008
Available-for-sale, Amortized Cost - Total debt securities	2,990,650	$ 2,994,616
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, Fair Value - Due in one year or less	9,998
Available-for-sale, Fair Value - Due after one year through five years	17,032
Available-for-sale, Fair Value - Due after five through ten years	308,548
Available-for-sale, Fair Value - Due after ten years	2,643,079
Debt Securities, Available-for-sale	2,978,657	2,898,730
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Held-to-maturity, Amortized Cost - Due in one year or less	2,350
Held-to-maturity, Amortized Cost - Due after one year through five years	6,812
Held-to-maturity, Amortized Cost - Due after five through ten years	112,156
Held-to-maturity, Amortized Cost - Due after ten years	4,515,389
Amortized Cost	4,636,707	4,325,420
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, Fair Value - Due in one year or less	2,357
Held-to-maturity, Fair Value - Due after one year through five years	6,959
Held to maturity, Fair Value - Due after five through ten years	115,431
Held to maturity, Fair Value - Due after ten years	4,549,763
Fair Value	$ 4,674,510	$ 4,209,121

Investment Securities Investmen

Investment Securities Investment Securities (Narrative) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	$ (34,192)	$ (98,669)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Unrealized Losses	(26,394)	(128,201)
Debt Securities, Available-for-sale	2,978,657	2,898,730
Pledged Financial Instruments, Not Separately Reported, Securities	2,300,000	2,200,000
Agency CMO [Member]
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	(1,264)	(4,457)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Unrealized Losses	(1,406)	(5,255)
Debt Securities, Available-for-sale	214,252	234,923
Agency MBS [Member]
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	(11,665)	(42,076)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Unrealized Losses	(20,616)	(79,701)
Debt Securities, Available-for-sale	1,619,472	1,481,089
Agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	(16,022)	(41,930)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Unrealized Losses	(3,684)	(22,572)
Debt Securities, Available-for-sale	578,701	566,237
Non-agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	(23)	(2,961)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Unrealized Losses	(37)	(2,388)
Debt Securities, Available-for-sale	429,068	445,581
CLO [Member]
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	(444)	(1,964)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale	96,389	112,771
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Unrealized Losses	(4,774)	(5,281)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale	30,777	50,579
Municipal Bonds [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Unrealized Losses	(651)	$ (18,285)
Callable at the option of the counterparty [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale	$ 1,200,000

Investment Securities (Narrativ

Investment Securities (Narrative) (Summary Of Realized Gain (Loss) on Investments (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Gain (Loss) on Investments [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 0	$ 0

Loans and Leases (Detail)

Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 19,269,883	$ 18,465,489	$ 18,025,996
Unamortized premiums	8,200	13,900
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral	6,800,000
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,718,704	4,416,637	4,455,580
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,301,291	2,396,704	2,485,695
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,519,953	6,216,606	5,981,556
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	5,224,382	4,927,145	4,580,200
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 505,553	$ 508,397	$ 522,965

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 180,686	$ 189,199
Financing Receivable, 90 Days or More Past Due, Still Accruing	410	104
Financing Receivable, Nonaccrual	148,301	154,767
Financing Receivable, Not Past Due	19,089,197	18,276,290
Loans and leases	19,269,883	18,465,489	$ 18,025,996
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	23,234	22,333
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	8,741	11,995
Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	59,105	62,002
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	48,228	49,188
Financing Receivable, Not Past Due	4,659,599	4,354,635
Loans and leases	4,718,704	4,416,637	4,455,580
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,922	8,513
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3,955	4,301
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	2,301,291	2,396,704	2,485,695
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	41,895	48,130
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	31,870	33,495
Financing Receivable, Not Past Due	2,035,234	2,121,049
Loans and leases	2,077,129	2,169,179
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	7,451	9,250
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,574	5,385
Consumer Portfolio Segment [Member] | Consumer Borrower [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	5,146	4,225
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	1,190	1,494
Financing Receivable, Not Past Due	219,016	223,300
Loans and leases	224,162	227,525
Consumer Portfolio Segment [Member] | Consumer Borrower [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,776	1,774
Consumer Portfolio Segment [Member] | Consumer Borrower [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,180	957
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	6,519,953	6,216,606	5,981,556
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	54,850	57,627
Financing Receivable, 90 Days or More Past Due, Still Accruing	410	104
Financing Receivable, Nonaccrual	52,452	55,810
Financing Receivable, Not Past Due	5,387,985	5,189,808
Loans and leases	5,442,835	5,247,435
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,300	1,011
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	688	702
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	184	224
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	184	224
Financing Receivable, Not Past Due	1,076,934	968,947
Loans and leases	1,077,118	969,171
Commercial Portfolio Segment [Member] | Asset Based Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Commercial Portfolio Segment [Member] | Asset Based Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	5,224,382	4,927,145	4,580,200
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,355	0
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	0	0
Financing Receivable, Not Past Due	253,713	218,831
Loans and leases	255,068	218,831
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,355	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	11,742	9,762
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	10,428	8,242
Financing Receivable, Not Past Due	4,957,572	4,698,552
Loans and leases	4,969,314	4,708,314
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,189	1,275
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	125	245
Finance Leases Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,409	7,229
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	3,949	6,314
Financing Receivable, Not Past Due	499,144	501,168
Loans and leases	505,553	508,397	$ 522,965
Finance Leases Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,241	510
Finance Leases Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 219	$ 405

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 208,950		$ 208,950
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	3,400	$ 2,400	6,100	$ 4,300
Write-down of TDR's			(5,600)	$ (5,200)
Finance Leases Portfolio Segment [Member]
Operating Leased Assets [Line Items]
Net Investment in Direct Financing and Sales Type Leases	164,000		164,000
Lessee, Operating Lease, Liability, Payments, Due	178,500		178,500
Sales-type and Direct Financing Leases, Interest Income	$ 1,500		$ 2,900

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 211,389	$ 205,349	$ 212,353	$ 199,994
Provision (benefit) charged to expense	11,900	10,500	20,500	21,500
Charge-offs	(14,382)	(11,398)	(27,416)	(19,008)
Recoveries	2,764	2,871	6,234	4,836
Balance, end of period	211,389	205,349	212,353	199,994	$ 211,671	$ 212,353	$ 207,322
ALLL, Individually evaluated for impairment					14,781		13,914
ALLL, Collectively evaluated for impairment					196,890		193,408
Loan and lease balances, Individually evaluated for impairment					253,247		257,205
Loan and lease balances, Collectively evaluated for impairment					19,016,636		17,768,791
Loans and leases					19,269,883	18,465,489	18,025,996
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	20,413	18,777	19,599	19,058
Provision (benefit) charged to expense	2,667	659	3,554	909
Charge-offs	(2,154)	(754)	(2,405)	(1,671)
Recoveries	295	325	473	711
Balance, end of period	20,413	18,777	19,599	19,058	21,221	19,599	19,007
ALLL, Individually evaluated for impairment					3,969		4,330
ALLL, Collectively evaluated for impairment					17,252		14,677
Loan and lease balances, Individually evaluated for impairment					100,168		109,636
Loan and lease balances, Collectively evaluated for impairment					4,618,536		4,345,944
Loans and leases					4,718,704	4,416,637	4,455,580
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	26,919	34,239	28,681	36,190
Provision (benefit) charged to expense	1,313	813	1,036	2,493
Charge-offs	(4,098)	(4,907)	(8,071)	(9,981)
Recoveries	1,972	1,614	4,460	3,057
Balance, end of period	26,919	34,239	28,681	36,190	26,106	28,681	31,759
ALLL, Individually evaluated for impairment					1,292		1,498
ALLL, Collectively evaluated for impairment					24,814		30,261
Loan and lease balances, Individually evaluated for impairment					37,332		41,636
Loan and lease balances, Collectively evaluated for impairment					2,263,959		2,444,059
Loans and leases					2,301,291	2,396,704	2,485,695
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	100,174	95,573	98,793	89,533
Provision (benefit) charged to expense	3,391	4,490	11,618	11,910
Charge-offs	(5,218)	(5,632)	(12,851)	(7,129)
Recoveries	453	909	1,240	1,026
Balance, end of period	100,174	95,573	98,793	89,533	98,800	98,793	95,340
ALLL, Individually evaluated for impairment					8,696		6,007
ALLL, Collectively evaluated for impairment					90,104		89,333
Loan and lease balances, Individually evaluated for impairment					97,919		87,071
Loan and lease balances, Collectively evaluated for impairment					6,422,034		5,894,485
Loans and leases					6,519,953	6,216,606	5,981,556
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	58,893	51,436	60,151	49,407
Provision (benefit) charged to expense	4,615	4,428	4,324	6,532
Charge-offs	(2,473)	(40)	(3,446)	(117)
Recoveries	33	9	39	11
Balance, end of period	58,893	51,436	60,151	49,407	61,068	60,151	55,833
ALLL, Individually evaluated for impairment					656		2,061
ALLL, Collectively evaluated for impairment					60,412		53,772
Loan and lease balances, Individually evaluated for impairment					13,879		12,677
Loan and lease balances, Collectively evaluated for impairment					5,210,503		4,567,523
Loans and leases					5,224,382	4,927,145	4,580,200
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	4,990	5,324	5,129	5,806
Provision (benefit) charged to expense	(86)	110	(32)	(344)
Charge-offs	(439)	(65)	(643)	(110)
Recoveries	11	14	22	31
Balance, end of period	$ 4,990	$ 5,324	$ 5,129	$ 5,806	4,476	5,129	5,383
ALLL, Individually evaluated for impairment					168		18
ALLL, Collectively evaluated for impairment					4,308		5,365
Loan and lease balances, Individually evaluated for impairment					3,949		6,185
Loan and lease balances, Collectively evaluated for impairment					501,604		516,780
Loans and leases					$ 505,553	$ 508,397	$ 522,965

Loans and Leases (Impaired Loan

Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 301,412	$ 298,667
Total Recorded Investment	253,247	259,330
Recorded Investment No Allowance	162,679	166,270
Recorded Investment With Allowance	90,568	93,060
Related Valuation Allowance	14,781	15,350
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	109,366	113,575
Total Recorded Investment	100,168	103,531
Recorded Investment No Allowance	64,494	64,899
Recorded Investment With Allowance	35,674	38,632
Related Valuation Allowance	3,969	4,286
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		44,654
Total Recorded Investment		39,144
Recorded Investment No Allowance		30,576
Recorded Investment With Allowance		8,568
Related Valuation Allowance		1,383
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	40,761
Total Recorded Investment	37,332
Recorded Investment No Allowance	29,295
Recorded Investment With Allowance	8,037
Related Valuation Allowance	1,292
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	127,092	120,165
Total Recorded Investment	97,735	99,287
Recorded Investment No Allowance	61,199	65,724
Recorded Investment With Allowance	36,536	33,563
Related Valuation Allowance	8,691	7,818
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	510	550
Total Recorded Investment	184	225
Recorded Investment No Allowance	0	0
Recorded Investment With Allowance	184	225
Related Valuation Allowance	5	6
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	19,734	13,355
Total Recorded Investment	13,879	10,828
Recorded Investment No Allowance	6,920	2,125
Recorded Investment With Allowance	6,959	8,703
Related Valuation Allowance	656	1,661
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,949	6,368
Total Recorded Investment	3,949	6,315
Recorded Investment No Allowance	771	2,946
Recorded Investment With Allowance	3,178	3,369
Related Valuation Allowance	$ 168	$ 196

Loans and Leases (Interest Inco

Loans and Leases (Interest Income From Impaired Loans And Leases, By Class) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 263,812	$ 252,843	$ 256,289	$ 251,978
Accrued Interest Income	2,104	2,182	4,274	4,128
Cash Basis Interest Income	523	515	1,067	1,018
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	101,245	110,787	101,850	111,965
Accrued Interest Income	912	948	1,820	1,929
Cash Basis Interest Income	282	265	546	518
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	38,092	42,112	38,238	43,536
Accrued Interest Income	287	290	556	584
Cash Basis Interest Income	241	250	521	500
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	106,753	80,475	98,511	78,896
Accrued Interest Income	844	871	1,764	1,410
Cash Basis Interest Income	0	0	0	0
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	201	1,347	204	875
Accrued Interest Income	0	0	0	0
Cash Basis Interest Income	0	0	0	0
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	13,070	11,802	12,354	11,951
Accrued Interest Income	61	38	134	134
Cash Basis Interest Income	0	0	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	4,451	6,320	5,132	4,755
Accrued Interest Income	0	35	0	71
Cash Basis Interest Income	$ 0	$ 0	$ 0	$ 0

Loans and Leases (Commercial, C

Loans and Leases (Commercial, Commercial Real Estate Loans And Equipment Financing Loans Segregated By Risk Rating Exposure) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 19,269,883	$ 18,465,489	$ 18,025,996
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	6,519,953	6,216,606	5,981,556
Commercial Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	6,124,187	5,781,138
Commercial Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	168,290	206,351
Commercial Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	220,758	222,405
Commercial Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	6,718	6,712
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	5,224,382	4,927,145	4,580,200
Commercial Real Estate Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	5,047,238	4,773,298
Commercial Real Estate Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	95,528	75,338
Commercial Real Estate Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	81,616	78,509
Commercial Real Estate Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	505,553	508,397	$ 522,965
Finance Leases Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	495,381	494,585
Finance Leases Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	2,560	1,303
Finance Leases Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	7,612	12,509
Finance Leases Portfolio Segment [Member] | (9) Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 0	$ 0

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 243,067		$ 230,414
Specific reserves for TDRs included in the balance of ALLL	211,671	$ 211,389	212,353	$ 207,322	$ 205,349	$ 199,994
Additional funds committed to borrowers in TDR status	6,160		3,893
Performing Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	136,081		138,479
Nonperforming Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	106,986		91,935
Nonperforming Financial Instruments [Member] | Troubled Debt Restructures [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDRs included in the balance of ALLL	$ 14,368		$ 11,930

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		6 Months Ended
	Jun. 30, 2019USD ($)loan	Jun. 30, 2018USD ($)loan	Jun. 30, 2019USD ($)loan	Jun. 30, 2018USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	34	38	77	64
Post-Modification Recorded Investment | $	$ 15,144	$ 32,729	$ 42,086	$ 39,384
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	3	0	4	0
Post-Modification Recorded Investment | $	$ 421	$ 0	$ 940	$ 0
Residential Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	8	3	13	3
Post-Modification Recorded Investment | $	$ 1,397	$ 276	$ 1,848	$ 276
Residential Portfolio Segment [Member] | Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	8	4	13
Post-Modification Recorded Investment | $	$ 281	$ 1,685	$ 542	$ 2,442
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	0	4	2
Post-Modification Recorded Investment | $	$ 225	$ 0	$ 370	$ 193
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	1	2	3
Post-Modification Recorded Investment | $	$ 110	$ 335	$ 110	$ 448
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	6	14	19	25
Post-Modification Recorded Investment | $	$ 466	$ 915	$ 1,220	$ 1,693
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	1	0	1	0
Post-Modification Recorded Investment | $	$ 100	$ 0	$ 100	$ 0
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	4	0	6	3
Post-Modification Recorded Investment | $	$ 69	$ 0	$ 193	$ 85
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	2	3	2
Post-Modification Recorded Investment | $	$ 46	$ 51	$ 71	$ 51
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	4	7	19	9
Post-Modification Recorded Investment | $	$ 12,029	$ 24,059	$ 34,056	$ 28,743
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	1	0	1
Post-Modification Recorded Investment | $	$ 0	$ 245	$ 0	$ 245
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	1	0	2
Post-Modification Recorded Investment | $	$ 0	$ 52	$ 0	$ 97
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	1	0	1
Post-Modification Recorded Investment | $	$ 0	$ 5,111	$ 0	$ 5,111
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	0	0	2	0
Post-Modification Recorded Investment | $	$ 0	$ 0	$ 2,636	$ 0

Loans and Leases (Investments i

Loans and Leases (Investments in TDRs, Segregated by Risk Rating Exposure) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 243,067	$ 230,414
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	105,567	87,739
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (1) - (6) Pass [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	19,295	13,165
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (7) Special Mention [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	72	84
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (8) Substandard [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	79,482	67,880
Commerial, Commercial Real Estate, Equipment Financing TDR's [Member] | (9) Doubtful [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 6,718	$ 6,610

Transfers of Financial Assets_2

Transfers of Financial Assets (Reserve for loan repurchases) (Detail) - SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 676	$ 664	$ 674	$ 872
Provision (benefit) charged to expense	1,813	13	1,820	(190)
Repurchased loans and settlements charged off	(1,805)	(3)	(1,810)	(8)
Ending balance	$ 684	$ 674	$ 684	$ 674

Transfers of Financial Assets_3

Transfers of Financial Assets (Loans sold) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale	$ 932	$ 1,235	$ 1,696	$ 2,379
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	42,851	45,257	63,464	90,063
Net gain on sale	700	598	858	1,681
Ancillary Fee Income Generated by Servicing Financial Assets, Amount	320	402	581	812
Fair value option adjustment	(88)	235	257	(114)
Residential Mortgage [Member] | Residential Mortgage Loans Servicing Retained [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	$ 39,465	$ 39,822	$ 56,813	$ 79,726

Transfers of Financial Assets_4

Transfers of Financial Assets (Mortgage Servicing Assets) (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights					$ 2,500,000
Proceeds from loans not originated for sale			$ 20,012	$ 34
Mortgage banking activities	$ 932	$ 1,235	1,696	2,379
Residential Mortgage [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights	2,400,000		2,400,000
Contractually Specified Servicing Fees, Amount	400	300	900	600
Proceeds from loans not originated for sale			4,000
Mortgage banking activities	$ 700	$ 598	858	1,681
Commercial Loan [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from loans not originated for sale			16,100	$ 34
Mortgage banking activities			$ 615

Transfers of Financial Assets S

Transfers of Financial Assets Servicing Assets at Amortized Cost Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning Balance	$ 19,785	$ 24,403	$ 21,215	$ 25,139
Additions	791	1,038	1,253	2,450
Amortization	(1,864)	(2,100)	(3,756)	(4,248)
Ending Balance	$ 18,712	$ 23,341	$ 18,712	$ 23,341

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Gross Carrying Value And Accumulated Amortization Of Other Intangible Assets) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 538,373	$ 538,373
Gross Carrying Amount	43,000	43,000
Accumulated Amortization	(19,159)	(17,236)
Net Carrying Amount	23,841	25,764
HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	21,813	21,813
Community Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	516,560	516,560
Core Deposits [Member] | HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,000	22,000
Accumulated Amortization	(11,957)	(10,842)
Net Carrying Amount	10,043	11,158
Customer Relationships [Member] | HSA Bank [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,000	21,000
Accumulated Amortization	(7,202)	(6,394)
Net Carrying Amount	$ 13,798	$ 14,606

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Jun. 30, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 1,923
2020	3,847
2021	3,847
2022	3,847
2023	3,847
Thereafter	$ 6,530

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Non-interest-bearing:
Demand	$ 4,174,806	$ 4,162,446
Interest-bearing:
HSA	6,212,372	5,740,601
Checking	2,636,109	2,518,472
Money market	2,073,006	2,100,084
Savings	4,169,492	4,140,696
Time deposits	3,332,993	3,196,546
Total interest-bearing	18,423,972	17,696,399
Total deposits	22,598,778	21,858,845
Time deposits and interest-bearing checking, included in above balances, obtained through brokers	700,315	869,003
Time deposits, included in above balance, that exceed the FDIC limit	701,839	555,949
Deposit overdrafts reclassified as loan balances	$ 1,114	$ 2,245

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Banking and Thrift [Abstract]
Remainder of 2019	$ 1,967,980
2020	961,586
2021	300,299
2022	65,878
2023	29,139
Thereafter	8,111
Total time deposits	$ 3,332,993	$ 3,196,546

Borrowings Borrowings - (Narrat

Borrowings Borrowings - (Narrative) (Details) - USD ($) $ in Billions	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Total borrowings	$ 2.9	$ 2.6

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 316,620	$ 236,874
Fed funds purchased	640,300	345,000
Securities sold under agreements to repurchase and other borrowings	$ 956,920	$ 581,874
Securities Sold under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.90%	0.35%
Federal Funds Purchased [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	2.43%	2.52%
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.92%	1.64%
Original maturity of one year or less [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 216,620	$ 236,874
Original maturity of one year or less [Member] | Securities Sold under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.46%	0.35%
Original maturity of greater than one year, non-callable [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 100,000	$ 0
Original maturity of greater than one year, non-callable [Member] | Securities Sold under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.86%	0.00%

Borrowings Borrowings (Summary

Borrowings Borrowings (Summary Of Advances Payable To the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Total Outstanding	$ 1,078,026	$ 1,403,026
FHLB advances maturing after 1 but within 2 years, Total Outstanding	190,000	215,000
FHLB advances maturing after 2 but within 3 years, Total Outstanding	150,000	200,000
FHLB advances maturing after 3 but within 4 years, Total Outstanding	140	150
FHLB advances maturing after 4 but within 5 years, Total Outstanding	236	242
FHLB advances maturing after 5 years, Total Outstanding	8,254	8,390
Federal Home Loan Bank, Advances	$ 1,426,656	$ 1,826,808
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]
FHLB advances maturing within 1 year, Weighted Average Contractual Coupon Rate (as a percent)	2.37%	2.55%
FHLB advances maturing after 1 but within 2 years, Weighted Average Contractual Coupon Rate (as a percent)	1.71%	1.73%
FHLB advances maturing after 2 but within 3 years, Weighted Average Contractual Coupon Rate (as a percent)	3.52%	3.16%
FHLB advances maturing after 3 but within 4 years, Weighted Average Contractual Coupon Rate (as a percent)	0.00%	0.00%
FHLB advances maturing after 4 but within 5 years, Weighted Average Contractual Coupon Rate (as a percent)	2.95%	2.95%
FHLB advances maturing after 5 years, Weighted Average Contractual Coupon Rate (as a percent)	2.65%	2.65%
Federal Home Loan Bank, Advances, Weighted Average Contractual Coupon Rate (as a percent)	2.40%	2.52%
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	$ 6,379,552	$ 6,689,761
Remaining borrowing capacity	$ 2,633,480	$ 2,568,664

Borrowings (Long Term Debt) (De

Borrowings (Long Term Debt) (Details) - USD ($)		6 Months Ended
		Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Notes and subordinated debt		$ 543,132,000	$ 227,320,000
Long-term Debt, Weighted Average Interest Rate, over Time		4.01%
Debt issuance cost on senior fixed-rates		$ (3,232,000)	(691,000)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		0
Long-term debt		$ 538,379,000	$ 226,021,000
Variable interest rate		5.36%	5.74%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		2.95%
Long-term Debt [Member]
Debt Instrument [Line Items]
Discount on senior fixed-rate notes		$ (1,521,000)	$ (608,000)
4.375% Senior fixed-rate notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Notes and subordinated debt		300,000,000
Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	[1]	$ 77,320,000	77,320,000
Debt Instrument, Redemption, Period One [Member] | 4.375% Senior fixed-rate notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)		4.375%
Notes and subordinated debt		$ 150,000,000	150,000,000
Debt Instrument, Redemption, Period Two [Member] | 4.375% Senior fixed-rate notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)		4.10%
Notes and subordinated debt		$ 315,812,000	$ 0
Long-term Debt [Member]
Debt Instrument [Line Items]
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		$ 15,812,000
[1]	The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month London Interbank Offered Rate plus 2.95% , was 5.36% at June 30, 2019 and 5.74% at December 31, 2018

Leases Lessee Accounting (Detai

Leases Lessee Accounting (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Jun. 30, 2018
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 158,270	$ 157,234	$ 0
Operating Lease, Liability	$ 178,724	$ 178,208	$ 0

Leases Lease Cost (Details)

Leases Lease Cost (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Lease, Cost [Abstract]
Operating Lease, Cost	$ 7,487	$ 14,872
Variable Lease, Cost	1,068	2,321
Sublease Income	(155)	(295)
Lease, Cost	8,400	16,898
Operating Lease, Payments	7,738	15,411
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 6,296	$ 12,934
Operating Lease, Weighted Average Remaining Lease Term	8 years 2 months 12 days	8 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.44%	3.44%

Leases Operating Lease Liabilit

Leases Operating Lease Liabilities, Payments, Due, Rolling Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Jun. 30, 2018
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months	$ 13,436
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two	31,178
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three	29,578
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four	25,857
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five	22,812
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five	86,089
Lessee, Operating Lease, Liability, Payments, Due	208,950
Operating Lease, Liability	178,724	$ 178,208	$ 0
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ 30,226

Leases Leases (Details)

Leases Leases (Details)	Jun. 30, 2019
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Term of Contract	5 years
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Term of Contract	20 years

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,966,255	$ 2,716,142	$ 2,886,515	$ 2,701,958
Other comprehensive income (loss), net of tax	35,651	(6,457)	64,462	(30,405)
Ending Balance	3,065,217	2,761,723	3,065,217	2,761,723
Available For Sale and Transferred Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(43,815)	(55,371)	(71,374)	(27,947)
OCI (OCL) before reclassifications	34,409	(9,246)	61,968	(36,670)
Amounts reclassified from AOCL	0	0	0	0
Other comprehensive income (loss), net of tax	34,409	(9,246)	61,968	(36,670)
Ending Balance	(9,406)	(64,617)	(9,406)	(64,617)
Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(9,117)	(12,494)	(9,313)	(15,016)
OCI (OCL) before reclassifications	(870)	294	(1,709)	1,423
Amounts reclassified from AOCL	1,056	1,386	2,091	2,779
Other comprehensive income (loss), net of tax	186	1,680	382	4,202
Ending Balance	(8,931)	(10,814)	(8,931)	(10,814)
Defined Benefit Pension and Other Postretirement Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(48,909)	(47,614)	(49,965)	(48,568)
OCI (OCL) before reclassifications	0	0	0	0
Amounts reclassified from AOCL	1,056	1,109	2,112	2,063
Other comprehensive income (loss), net of tax	1,056	1,109	2,112	2,063
Ending Balance	(47,853)	(46,505)	(47,853)	(46,505)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(101,841)	(115,479)	(130,652)	(91,531)
OCI (OCL) before reclassifications	33,539	(8,952)	60,259	(35,247)
Amounts reclassified from AOCL	2,112	2,495	4,203	4,842
Other comprehensive income (loss), net of tax	35,651	(6,457)	64,462	(30,405)
Ending Balance	$ (66,190)	$ (121,936)	$ (66,190)	$ (121,936)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (26,451)	$ (20,743)	$ (52,592)	$ (40,818)
Earnings applicable to common shareholders	96,193	79,489	193,483	157,573
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	0	0	0	0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(1,056)	(1,386)	(2,091)	(2,779)
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]
Other Nonoperating Expense	(1,408)	(1,861)	(2,799)	(3,732)
Interest Income, Other	(12)	0	(12)	0
Income tax expense	364	475	720	953
Earnings applicable to common shareholders	(1,056)	(1,386)	(2,091)	(2,779)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1,429)	(1,493)	(2,859)	(2,778)
Defined benefit pension and postretirement benefit plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	373	384	747	715
Net of tax	$ (1,056)	$ (1,109)	$ (2,112)	$ (2,063)

Regulatory Matters (Information

Regulatory Matters (Information On The Capital Ratios) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 2,401,959		$ 2,284,978
Common Equity Tier One Capital Ratio	11.41%		11.44%
Common Equity Tier One Capital Required for Capital Adequacy	$ 947,715		$ 898,972
Common Equity Tier One Capital Required to be Well-Capitalized	1,368,922		1,298,514
Total risk-based capital, Actual Amount	$ 2,838,524		$ 2,722,194
Total risk-based capital, Actual Ratio	13.48%		13.63%
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,684,827		$ 1,598,172
Total risk-based capital, Capital Requirements, Minimum Ratio	8.00%		8.00%
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 2,106,034		$ 1,997,715
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	10.00%		10.00%
Tier 1 capital, Actual Amount	$ 2,546,996		$ 2,430,015
Tier 1 capital, Actual Ratio	12.09%		12.16%
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,263,620		$ 1,198,629
Tier 1 capital, Capital Requirements, Minimum Ratio	6.00%		6.00%
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,684,827		$ 1,598,172
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	8.00%		8.00%
Tier 1 leverage capital ratio, Actual Amount	$ 2,546,996		$ 2,430,015
Tier 1 leverage capital ratio, Actual Ratio	9.09%		9.02%
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 1,120,243		$ 1,077,303
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	4.00%		4.00%
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 1,400,303		$ 1,346,628
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	5.00%		5.00%
Dividends paid	$ 110,000	$ 150,000
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 2,574,538		$ 2,170,566
Common Equity Tier One Capital Ratio	12.23%		10.87%
Common Equity Tier One Capital Required for Capital Adequacy	$ 947,077		$ 898,317
Common Equity Tier One Capital Required to be Well-Capitalized	1,368,000		1,297,569
Total risk-based capital, Actual Amount	$ 2,788,746		$ 2,385,425
Total risk-based capital, Actual Ratio	13.25%		11.95%
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,683,692		$ 1,597,008
Total risk-based capital, Capital Requirements, Minimum Ratio	8.00%		8.00%
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 2,104,615		$ 1,996,260
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	10.00%		10.00%
Tier 1 capital, Actual Amount	$ 2,574,538		$ 2,170,566
Tier 1 capital, Actual Ratio	12.23%		10.87%
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,262,769		$ 1,197,756
Tier 1 capital, Capital Requirements, Minimum Ratio	6.00%		6.00%
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,683,692		$ 1,597,008
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	8.00%		8.00%
Tier 1 leverage capital ratio, Actual Amount	$ 2,574,538		$ 2,170,566
Tier 1 leverage capital ratio, Actual Ratio	9.20%		8.06%
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 1,119,896		$ 1,076,712
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	4.00%		4.00%
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 1,399,871		$ 1,345,889
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	5.00%		5.00%
Cash Pass-through Reserve, Federal Home Loan Bank	$ 104,000		$ 81,200
Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital Ratio	4.50%		4.50%
Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets [Member] | Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital Ratio	4.50%		4.50%
Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital Ratio	6.50%		6.50%
Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets [Member] | Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital Ratio	6.50%		6.50%

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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings for basic and diluted earnings per common share:
Net income	$ 98,649	$ 81,682	$ 198,385	$ 161,907
Less: Preferred stock dividends	1,969	1,969	3,938	3,916
Undistributed Earnings, Basic	96,680	79,713	194,447	157,991
Net income available to common shareholders	96,680	79,713	194,447	157,991
Less: Earnings applicable to participating restricted stock	487	224	964	418
Less: Earnings applicable to participating securities	487	224	964	418
Earnings applicable to common shareholders	96,193	79,489	193,483	157,573
Earnings applicable to common shareholders	$ 96,193	$ 79,489	$ 193,483	$ 157,573
Effect of dilutive securities:
Weighted average common shares outstanding - basic (in shares)	91,534	91,893	91,550	91,913
Stock options and restricted stock (in shares)	321	280	348	323
Weighted-average common shares outstanding - diluted (in shares)	91,855	92,173	91,898	92,236
Earnings per common share:
Basic (in dollars per share)	$ 1.05	$ 0.87	$ 2.11	$ 1.71
Diluted (in dollars per share)	$ 1.05	$ 0.86	$ 2.11	$ 1.71

Earnings Per Common Share Sched

Earnings Per Common Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Narrative (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restricted stock (due to performance conditions on non-participating shares) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	87	53	59	61

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)		Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative instrument assets, Gross Amount		$ 6,578,000	$ 9,928,000
Asset Derivatives, Fair Value, Less: Cash collateral posted		40,400,000
Derivative Asset		2,706,000	2,497,000
Liability Derivatives, Fair Value, Gross Liability		10,615,000	2,566,000
Derivative liability		2,944,000	71,000
CME [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset		0
Subject to and not subject to Master Netting Agreements [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts		5,433,863,000	4,859,561,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		142,433,000	46,278,000
Asset Derivatives, Fair Value, Less: Legally enforceable master netting agreements		2,367,000	2,495,000
Asset Derivatives, Fair Value, Less: Cash collateral posted		1,505,000	4,936,000
Derivative Asset		138,561,000	38,847,000
Liability Derivatives, Notional Amount		4,325,924,000	3,801,586,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		14,045,000	39,010,000
Liability Derivatives, Fair Value, Less: Legally enforceable master netting agreements		2,367,000	2,495,000
Liability Derivatives, Fair Value, Less: Cash collateral posted		5,304,000	0
Derivative liability		6,374,000	36,515,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instrument assets, Gross Amount		4,515,000	3,050,000
Asset Derivatives, Fair Value, Less: Legally enforceable master netting agreements		970,000	88,000
Asset Derivatives, Fair Value, Less: Cash collateral posted		1,505,000	567,000
Derivative Asset		2,040,000	2,395,000
Liability Derivatives, Fair Value, Gross Liability		0	0
Liability Derivatives, Fair Value, Less: Legally enforceable master netting agreements		0	0
Liability Derivatives, Fair Value, Less: Cash collateral posted		0	0
Derivative liability		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]
Asset Derivatives, Notional Amounts	[1]	825,000,000	325,000,000
Derivative instrument assets, Gross Amount	[1]	4,515,000	3,050,000
Liability Derivatives, Notional Amount	[1]	0	0
Liability Derivatives, Fair Value, Gross Liability	[1]	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instrument assets, Gross Amount		2,063,000	6,878,000
Asset Derivatives, Fair Value, Less: Legally enforceable master netting agreements		1,397,000	2,407,000
Asset Derivatives, Fair Value, Less: Cash collateral posted		0	4,369,000
Derivative Asset		666,000	102,000
Liability Derivatives, Fair Value, Gross Liability		10,615,000	2,566,000
Liability Derivatives, Fair Value, Less: Legally enforceable master netting agreements		2,367,000	2,495,000
Liability Derivatives, Fair Value, Less: Cash collateral posted		5,304,000	0
Derivative liability		2,944,000	71,000
Not Designated as Hedging Instrument [Member] | CME [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	[1]	900,000,000	1,900,000,000
Liability Derivatives, Notional Amount	[1]	2,600,000,000	1,100,000,000
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]
Asset Derivatives, Notional Amounts	[1]	1,398,175,000	2,767,518,000
Derivative instrument assets, Gross Amount	[1]	1,578,000	6,570,000
Liability Derivatives, Notional Amount	[1]	2,905,312,000	1,276,109,000
Liability Derivatives, Fair Value, Gross Liability	[1]	9,617,000	2,012,000
Not Designated as Hedging Instrument [Member] | Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member] | Mortgage Banking Derivatives [Member] | RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts		42,284,000	13,599,000
Derivative instrument assets, Gross Amount		374,000	226,000
Not Designated as Hedging Instrument [Member] | Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member] | Mortgage Banking Derivatives [Member] | RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount		46,073,000	17,000,000
Liability Derivatives, Fair Value, Gross Liability		399,000	293,000
Not Designated as Hedging Instrument [Member] | Derivatives Subject to Master Netting Arrangement or Similar Arrangement [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	[1]	13,124,000	11,952,000
Derivative instrument assets, Gross Amount	[1]	111,000	308,000
Liability Derivatives, Notional Amount	[1]	53,318,000	43,097,000
Liability Derivatives, Fair Value, Gross Liability	[1]	599,000	553,000
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts		4,608,863,000	4,534,561,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement		137,918,000	43,228,000
Liability Derivatives, Notional Amount		4,325,924,000	3,801,586,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement		14,045,000	39,010,000
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]
Asset Derivatives, Notional Amounts		3,084,348,000	1,668,012,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement		135,374,000	35,635,000
Liability Derivatives, Notional Amount		1,218,947,000	2,367,876,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement		3,250,000	36,017,000
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Credit Risk Contract [Member] | RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts		64,382,000	64,974,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement		88,000	39,000
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Credit Risk Contract [Member] | RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount		101,565,000	96,296,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement		137,000	81,000
Not Designated as Hedging Instrument [Member] | Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts		6,550,000	8,506,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement		393,000	450,000
Liability Derivatives, Notional Amount		709,000	1,208,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement		43,000	$ 54,000
Loan Origination Commitments [Member]
Derivatives, Fair Value [Line Items]
Other Commitment		45,000,000
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Other Commitment		$ 12,300,000
[1]	o 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.

Derivative Financial Instrume_4

Derivative Financial Instruments (Schedule of the changes in the fair value of non-hedge accounting derivatives) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 3,637	$ 3,848		$ 7,114
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings			$ 4,795
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	4,071	1,958	5,122	5,749
Mortgage Banking 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	157	(134)	(251)	(69)
Other Contract [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	(591)	2,024	(76)	1,434
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	0	0	0	0
Fair Value Hedging [Member] | Operating Expense [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(14,184)	0	(15,812)	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	992	1,668	1,945	3,491
Cash Flow Hedging [Member] | 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	980	1,668	1,933	3,491
Cash Flow Hedging [Member] | Interest Rate Derivatives [Member] | Other Income [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	12	0	12	0
Long-term Debt [Member] | Fair Value Hedging [Member] | Operating Expense [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	14,184	$ 0	15,812	$ 0
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	137,918		137,918		$ 43,228
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	135,374		135,374		35,635
Derivatives Not Subject to Master Netting Arrangement or Similar Arrangement [Member] | Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement Deduction	$ 393		$ 393		$ 450

Derivative Financial Instrume_5

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) - Cash Flow Hedging [Member] $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ (3.2)
Remaining unamortized gain (loss) on termination of cash flow hedges	(6.7)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ 1.9

Derivative Financial Instrume_6

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative instrument assets, Gross Amount	$ 6,578	$ 9,928
Derivative instrument asset, Amount Offset	40,400
Derivative Asset	2,706	2,497
Liability Derivatives, Fair Value, Gross Liability	10,615	2,566
Derivative liability	2,944	71
Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative instrument assets, Gross Amount	4,515	3,050
Derivative instrument asset, Amount Offset, Total	(970)	(88)
Derivative instrument asset, Amount Offset	1,505	567
Derivative Asset	2,040	2,395
Liability Derivatives, Fair Value, Gross Liability	0	0
Derivative instrument liability, Amount Offset, Total	0	0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative liability	0	0
Non-Hedged Accounting Positions [Member]
Derivative [Line Items]
Derivative instrument assets, Gross Amount	2,063	6,878
Derivative instrument asset, Amount Offset, Total	(1,397)	(2,407)
Derivative instrument asset, Amount Offset	0	4,369
Derivative Asset	666	102
Liability Derivatives, Fair Value, Gross Liability	10,615	2,566
Derivative instrument liability, Amount Offset, Total	(2,367)	(2,495)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(5,304)	0
Derivative liability	2,944	71
Subject to and not subject to Master Netting Agreements [Member]
Derivative [Line Items]
Derivative instrument asset, Amount Offset, Total	(2,367)	(2,495)
Derivative instrument asset, Amount Offset	1,505	4,936
Derivative Asset	138,561	38,847
Derivative instrument liability, Amount Offset, Total	(2,367)	(2,495)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(5,304)	0
Derivative liability	$ 6,374	$ 36,515

Derivative Financial Instrume_7

Derivative Financial Instruments Impact of Fair Value on Qualifying Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 3,637	$ 3,848		$ 7,114
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	0		$ 0
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	0	0	0	0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	992	1,668	1,945	3,491
Operating Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(14,184)	0	(15,812)	0
Long-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Liability, Fair Value Hedge	315,812		315,812		$ 0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	15,812		15,812
Long-term Debt [Member] | Operating Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 14,184	$ 0	$ 15,812	$ 0

Derivative Financial Instrume_8

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Derivative [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge	9 years 6 months
Derivative instrument asset, Amount Offset	$ 40.4
Credit Derivative, Maximum Exposure, Undiscounted	135.4
Valuation, Market Approach [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	35.6
Over the Counter [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	119.5
Exchange Cleared [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 74.8

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 6,320,177	$ 6,050,806
Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Book value of other real estate owned (OREO) and repossessed assets	5,200
Rabbi Trust [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	1,700
Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total credit-related financial instruments with off-balance sheet risk	5,200
Alternative investments [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	$ 6,800

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring and Nonrecurring Basis) (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Financial assets held at fair value:
Debt Securities, Available-for-sale		$ 2,978,657	$ 2,898,730
Derivative Asset		2,706	2,497
Loans Held-for-sale, Fair Value Disclosure		19,249	7,908
Financial liabilities held at fair value:
Derivative liability		2,944	71
US Treasury Bill Securities [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		9,998	7,550
Agency CMO [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		214,252	234,923
Agency MBS [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		1,619,472	1,481,089
Agency CMBS [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		578,701	566,237
Non-agency CMBS [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		429,068	445,581
CLO [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		96,389	112,771
Corporate debt securities [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		30,777	50,579
Fair Value, Recurring [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		2,978,657	2,898,730
Alternative Investment		2,990	2,563
Total financial assets held at fair value		3,147,978	2,959,786
Financial liabilities held at fair value:
Derivative liability	[1]	14,045	39,010
Fair Value, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		9,998	7,550
Alternative Investment		0	0
Total financial assets held at fair value		15,151	12,615
Financial liabilities held at fair value:
Derivative liability	[1]	620	588
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		2,968,659	2,891,180
Alternative Investment		0	0
Total financial assets held at fair value		3,129,837	2,944,608
Financial liabilities held at fair value:
Derivative liability	[1]	13,425	38,422
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets held at fair value:
Alternative Investment		2,990	2,563
Total financial assets held at fair value		2,990	2,563
Financial liabilities held at fair value:
Derivative liability			0
Fair Value, Recurring [Member] | Derivative instruments [Member]
Financial assets held at fair value:
Derivative Asset	[1]	142,433	46,278
Fair Value, Recurring [Member] | Derivative instruments [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Derivative Asset	[1]	504	758
Fair Value, Recurring [Member] | Derivative instruments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Derivative Asset	[1]	141,929	45,520
Fair Value, Recurring [Member] | Derivative instruments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets held at fair value:
Derivative Asset			0
Fair Value, Recurring [Member] | Investments Held In Rabbi Trust [Member]
Financial assets held at fair value:
Other assets		4,649	4,307
Fair Value, Recurring [Member] | Investments Held In Rabbi Trust [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Other assets		4,649	4,307
Fair Value, Recurring [Member] | Investments Held In Rabbi Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets held at fair value:
Other assets			0
Fair Value, Recurring [Member] | Loan Origination Commitments [Member]
Financial assets held at fair value:
Loans Held-for-sale, Fair Value Disclosure		19,249	7,908
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Loans Held-for-sale, Fair Value Disclosure		0	0
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Loans Held-for-sale, Fair Value Disclosure		19,249	7,908
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets held at fair value:
Loans Held-for-sale, Fair Value Disclosure		0
Fair Value, Recurring [Member] | US Treasury Bill Securities [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		9,998	7,550
Fair Value, Recurring [Member] | US Treasury Bill Securities [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		9,998	7,550
Fair Value, Recurring [Member] | Agency CMO [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		214,252	234,923
Fair Value, Recurring [Member] | Agency CMO [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		214,252	234,923
Fair Value, Recurring [Member] | Agency MBS [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		1,619,472	1,481,089
Fair Value, Recurring [Member] | Agency MBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		1,619,472	1,481,089
Fair Value, Recurring [Member] | Agency CMBS [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		578,701	566,237
Fair Value, Recurring [Member] | Agency CMBS [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | Agency CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		578,701	566,237
Fair Value, Recurring [Member] | Agency CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | Agency CMBS [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | Non-agency CMBS [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		429,068	445,581
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		429,068	445,581
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		0	0
Fair Value, Recurring [Member] | CLO [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		96,389	112,771
Fair Value, Recurring [Member] | CLO [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		96,389	112,771
Fair Value, Recurring [Member] | Corporate debt securities [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		30,777	50,579
Fair Value, Recurring [Member] | Corporate debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Debt Securities, Available-for-sale		$ 30,777	$ 50,579
[1]	or information relating to the impact of netting derivative assets and derivative liabilities as well as the impact from offsetting cash collateral paid to the same derivative counterparties see Note 13: Derivative Financial Instruments .

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Option, Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 19,249	$ 7,908
Loans held for sale (valued under fair value option $19,249 and $7,908)	19,249	11,869
Fair Value, Option, Loans Held as Assets, Aggregate Difference	232	(319)
loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale (valued under fair value option $19,249 and $7,908)	$ 19,017	$ 8,227

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity		$ 4,636,707		$ 4,325,420
Debt Securities, Held-to-maturity, Fair Value		4,674,510		4,209,121
Mortgage servicing assets, Carrying Amount		18,712	$ 19,785	21,215	$ 23,341	$ 24,403	$ 25,139
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity		4,636,707		4,325,420
Loans and leases, net		19,058,212		18,253,136
Securities sold under agreements to repurchase and other borrowings		956,920		581,874
FHLB advances	[1]	1,426,656		1,826,808
Long-term debt	[1]	538,379		226,021
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Deposits Liabilities, other than time deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		19,265,785		18,662,299
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Time Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		3,332,993		3,196,546
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount		18,712		21,215
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, Fair Value		4,674,510		4,209,121
Securities sold under agreements to repurchase and other borrowings		954,844		581,874
FHLB advances	[1]	1,429,684		1,826,381
Long-term debt	[1]	553,287		229,306
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net		19,184,264		18,155,798
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Deposits Liabilities, other than time deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		19,265,785		18,662,299
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Time Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposits		3,334,113		3,175,948
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Fair value		$ 36,572		$ 45,478
[1]	djustments to the carrying amount of long-term debt for unamortized discount and debt issuance cost on senior fixed-rate notes are not included for determination of fair value, see Note 8: Borrowings .

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	$ 1,977	$ 1,935	$ 3,955	$ 3,720
Expected return on plan assets	(2,815)	(3,180)	(5,630)	(6,360)
Recognized net loss	1,430	1,160	2,860	2,320
Net periodic benefit cost	592	(85)	1,185	(320)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	16	(21)	32	166
Expected return on plan assets	0	0	0	0
Recognized net loss	3	333	7	458
Net periodic benefit cost	19	312	39	624
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	21	19	42	39
Expected return on plan assets	0	0	0	0
Recognized net loss	(4)	0	(8)	0
Net periodic benefit cost	$ 17	$ 19	$ 34	$ 39

Segment Reporting (Operating Re

Segment Reporting (Operating Results and Total Assets Reportable Segments) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 28,942,043		$ 28,942,043		$ 27,610,315
Net interest income (expense)	241,787	$ 225,010	483,338	$ 439,178
Provision for Loan and Lease Losses	11,900	10,500	20,500	21,500
Net interest income after provision for loan and lease losses	229,887	214,510	462,838	417,678
Noninterest Income	75,853	68,374	144,465	137,121
Total non-interest expense	180,640	180,459	356,326	352,074
Income (loss) before income tax expense	125,100	102,425	250,977	202,725
Income tax expense	26,451	20,743	52,592	40,818
Net income	98,649	81,682	198,385	161,907
Operating Segments [Member] | Commercial Banking [Member]
Segment Reporting Information [Line Items]
Total Assets	11,061,635		11,061,635		10,477,050
Net interest income (expense)	92,171	88,459	182,681	173,110
Provision for Loan and Lease Losses	7,741	8,630	13,982	15,477
Net interest income after provision for loan and lease losses	84,430	79,829	168,699	157,633
Noninterest Income	14,645	15,041	28,656	30,357
Total non-interest expense	46,196	42,979	90,814	84,224
Income (loss) before income tax expense	52,879	51,891	106,541	103,766
Income tax expense	13,008	12,765	26,209	25,527
Net income	39,871	39,126	80,332	78,239
Operating Segments [Member] | HSA Bank [Member]
Segment Reporting Information [Line Items]
Total Assets	82,232		82,232		70,826
Net interest income (expense)	42,626	35,265	84,367	68,189
Provision for Loan and Lease Losses	0	0	0	0
Net interest income after provision for loan and lease losses	42,626	35,265	84,367	68,189
Noninterest Income	24,979	22,882	50,556	45,551
Total non-interest expense	34,253	31,220	67,775	62,735
Income (loss) before income tax expense	33,352	26,927	67,148	51,005
Income tax expense	8,672	7,001	17,459	13,261
Net income	24,680	19,926	49,689	37,744
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Total Assets	9,059,657		9,059,657		8,727,335
Net interest income (expense)	102,699	101,902	204,059	200,830
Provision for Loan and Lease Losses	4,159	1,870	6,518	6,023
Net interest income after provision for loan and lease losses	98,540	100,032	197,541	194,807
Noninterest Income	27,675	26,378	53,057	51,573
Total non-interest expense	96,166	95,197	191,241	192,026
Income (loss) before income tax expense	30,049	31,213	59,357	54,354
Income tax expense	5,980	6,211	11,812	10,816
Net income	24,069	25,002	47,545	43,538
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total Assets	8,738,519		8,738,519		$ 8,335,104
Net interest income (expense)	4,291	(616)	12,231	(2,951)
Provision for Loan and Lease Losses	0	0	0	0
Net interest income after provision for loan and lease losses	4,291	(616)	12,231	(2,951)
Noninterest Income	8,554	4,073	12,196	9,640
Total non-interest expense	4,025	11,063	6,496	13,089
Income (loss) before income tax expense	8,820	(7,606)	17,931	(6,400)
Income tax expense	(1,209)	(5,234)	(2,888)	(8,786)
Net income	$ 10,029	$ (2,372)	$ 20,819	$ 2,386

Segment Reporting Segment Repor

Segment Reporting Segment Reporting Narrative (Details)	6 Months Ended
	Jun. 30, 2019Segment
Segment Reporting Information [Line Items]
Number of Reportable Segments	3

Revenue from Contracts with C_3

Revenue from Contracts with Customers Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 53,406	$ 50,831	$ 105,631	$ 100,502
Noninterest Income	75,853	68,374	144,465	137,121
Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	43,118	40,859	86,142	81,310
Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8,309	8,456	15,960	16,326
Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,979	1,516	3,529	2,866
Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income	22,447	17,543	38,834	36,619
Operating Segments [Member] | Commercial Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,627	5,767	11,147	11,528
Noninterest Income	14,645	15,041	28,656	30,357
Operating Segments [Member] | Commercial Banking [Member] | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,085	3,180	6,121	6,402
Operating Segments [Member] | Commercial Banking [Member] | Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,542	2,587	5,026	5,126
Operating Segments [Member] | Commercial Banking [Member] | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Operating Segments [Member] | Commercial Banking [Member] | Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income	9,018	9,274	17,509	18,829
Operating Segments [Member] | Community Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22,769	22,181	43,810	43,322
Noninterest Income	27,675	26,378	53,057	51,573
Operating Segments [Member] | Community Banking [Member] | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	16,289	15,663	31,654	30,972
Operating Segments [Member] | Community Banking [Member] | Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,776	5,878	10,951	11,217
Operating Segments [Member] | Community Banking [Member] | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	704	640	1,205	1,133
Operating Segments [Member] | Community Banking [Member] | Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income	4,906	4,197	9,247	8,251
Operating Segments [Member] | HSA Bank [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	24,979	22,882	50,556	45,551
Noninterest Income	24,979	22,882	50,556	45,551
Operating Segments [Member] | HSA Bank [Member] | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	23,704	22,006	48,232	43,818
Operating Segments [Member] | HSA Bank [Member] | Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Operating Segments [Member] | HSA Bank [Member] | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,275	876	2,324	1,733
Operating Segments [Member] | HSA Bank [Member] | Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income	0	0	0	0
Corporate, Non-Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	31	1	118	101
Noninterest Income	8,554	4,073	12,196	9,640
Corporate, Non-Segment [Member] | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40	10	135	118
Corporate, Non-Segment [Member] | Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(9)	(9)	(17)	(17)
Corporate, Non-Segment [Member] | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Corporate, Non-Segment [Member] | Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income	$ 8,523	$ 4,072	$ 12,078	$ 9,539

Commitments and Contingencies_2

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 6,320,177	$ 6,050,806
Standby letter of credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	189,890	189,040
Commercial letter of credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	22,837	21,181
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total credit-related financial instruments with off-balance sheet risk	$ 6,107,450	$ 5,840,585

(Reserve for Unfunded Commitmen

(Reserve for Unfunded Commitments) (Detail) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 2,511	$ 2,294	$ 2,506	$ 2,362
Provision charged to expense	26	302	31	234
Ending balance	$ 2,537	$ 2,596	$ 2,537	$ 2,596