Webster Financial (WBS) 10-Q4 Aug 212021 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2021	Jul. 30, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
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 Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		90,592,291
Entity Central Index Key	0000801337
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Common Class A [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	WBS
Security Exchange Name	NYSE
Series F Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing 1/1000th interest in a share
Trading Symbol	WBS PrF
Security Exchange Name	NYSE

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets [Abstract]
Cash and due from banks	$ 193,430	$ 193,501
Interest-bearing deposits	1,386,463	69,603
Investment securities available-for-sale, at fair value	3,262,893	3,326,776
Investment securities held-to-maturity, net of allowance for credit losses of $382 and $299	5,623,243	5,567,889
Federal Home Loan Bank and Federal Reserve Bank stock	76,874	77,594
Loans held for sale (valued under fair value option $4,335 and $14,000)	4,335	14,012
Loans and leases	21,475,001	21,641,215
Allowance for credit losses on loans and leases	(307,945)	(359,431)
Loans and leases, net	21,167,056	21,281,784
Deferred tax assets, net	78,268	81,286
Premises and equipment, net	215,716	226,743
Goodwill	538,373	538,373
Other intangible assets, net	20,112	22,383
Cash surrender value of life insurance policies	570,380	564,195
Accrued interest receivable and other assets	616,609	626,551
Total assets	33,753,752	32,590,690
Liabilities and Equity [Abstract]
Non-interest-bearing	6,751,373	6,155,592
Interest-bearing	22,095,593	21,179,844
Total deposits	28,846,966	27,335,436
Securities sold under agreements to repurchase and other borrowings	507,124	995,355
Federal Home Loan Bank advances	138,444	133,164
Long-term debt	565,297	567,663
Operating lease liabilities	154,461	158,280
Accrued expenses and other liabilities	211,755	166,167
Total liabilities	30,424,047	29,356,065
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock	145,037	145,037
Common stock	937	937
Paid-in capital	1,101,126	1,109,532
Retained earnings	2,203,160	2,077,522
Treasury stock, at cost (3,092,351 and 3,487,389 shares)	(126,445)	(140,659)
Accumulated other comprehensive income, net of tax	5,890	42,256
Total shareholders' equity	3,329,705	3,234,625
Total liabilities and shareholders' equity	$ 33,753,752	$ 32,590,690

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for credit losses	$ (382)	$ (299)
Value under fair value options	$ 4,335	$ 14,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Series F outstanding (in shares)	6,000	6,000
Series F issued (in shares)	6,000	6,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Issued (93,686,311 shares)	93,686,311	93,686,311
Treasury stock, at cost (3,092,351 and 3,487,389 shares)	3,092,351	3,487,389

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest and Dividend Income, Operating [Abstract]
Interest and fees on loans and leases	$ 185,919	$ 196,521	$ 376,455	$ 412,708
Taxable interest and dividends on investments	40,303	50,069	79,917	102,691
Non-taxable interest on investment securities	5,283	5,501	10,616	10,987
Loans held for sale	53	184	144	359
Total interest income	231,558	252,275	467,132	526,745
Interest Expense [Abstract]
Deposits	5,094	18,805	11,533	46,648
Securities sold under agreements to repurchase and other borrowings	860	980	1,495	4,710
Federal Home Loan Bank advances	534	3,748	1,047	10,617
Long-term debt	4,218	4,335	8,441	9,562
Total interest expense	10,706	27,868	22,516	71,537
Net interest income	220,852	224,407	444,616	455,208
Provision for credit losses	(21,500)	40,000	(47,250)	116,000
Net interest income after provision for credit losses	242,352	184,407	491,866	339,208
Noninterest Income [Abstract]
Deposit service fees	41,439	35,839	81,908	78,409
Loan and lease related fees	7,862	6,968	16,175	13,464
Wealth and investment services	10,087	7,102	19,490	15,841
Mortgage banking activities	1,319	4,205	3,961	7,098
Increase in cash surrender value of life insurance policies	3,603	3,624	7,136	7,204
Gain on Sale of Investments	0	0	0	8
Other income	8,392	2,338	20,789	11,430
Total non-interest income	72,702	60,076	149,459	133,454
Noninterest Expense [Abstract]
Compensation and benefits	97,754	99,731	205,354	201,618
Occupancy	14,010	14,245	29,660	28,730
Technology and equipment	27,124	27,468	55,640	55,305
Intangible assets amortization	1,132	962	2,271	1,924
Marketing	3,227	3,286	5,731	6,788
Professional and outside services	21,025	6,158	30,801	11,821
Deposit insurance	3,749	5,015	7,705	9,740
Other expense	19,007	19,719	37,848	39,494
Total non-interest expense	187,028	176,584	375,010	355,420
Income before income tax expense	128,026	67,899	266,315	117,242
Income tax expense	33,991	14,802	64,202	25,946
Net income	94,035	53,097	202,113	91,296
Preferred stock dividends and other	(2,480)	(2,368)	(5,028)	(4,530)
Earnings applicable to common shareholders	$ 91,555	$ 50,729	$ 197,085	$ 86,766
Earnings Per Share, Basic and Diluted [Abstract]
Basic	$ 1.02	$ 0.57	$ 2.19	$ 0.96
Diluted	$ 1.01	$ 0.57	$ 2.19	$ 0.96

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 94,035	$ 53,097	$ 202,113	$ 91,296
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Investment securities available-for-sale	(1,473)	61,914	(31,826)	46,225
Derivative instruments	(1,652)	3,601	(6,024)	29,833
Defined benefit pension and other postretirement benefit plans	741	730	1,484	1,459
Other comprehensive (loss) income, net of tax	(2,384)	66,245	(36,366)	77,517
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total	$ 91,651	$ 119,342	$ 165,747	$ 168,813

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Series F Preferred Stock [Member]	Preferred Stock	Preferred StockCumulative Effect, Period of Adoption, Adjustment	Common Stock	Common StockCumulative Effect, Period of Adoption, Adjustment	Paid-In Capital	Paid-In CapitalCumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsSeries F Preferred Stock [Member]	Treasury Stock, at cost	Treasury Stock, at costCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss), Net of Tax	Accumulated Other Comprehensive (Loss), Net of TaxCumulative Effect, Period of Adoption, Adjustment
Beginning Balance at Dec. 31, 2019	$ 3,207,770	$ (51,213)		$ 145,037	$ 0	$ 937	$ 0	$ 1,113,250	$ 0	$ 2,061,352	$ (51,213)		$ (76,734)	$ 0	$ (36,072)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	91,296									91,296
Other Comprehensive Income (Loss), Net of Tax	77,517														77,517
Dividends and dividend equivalents declared on common stock	(73,010)									(73,010)
Dividends on preferred stock			$ (3,938)									$ (3,938)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	6,014							(9,389)		0			15,403
Stock Issued During Period, Value, Stock Options Exercised	118							(105)					223
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(3,219)												(3,219)
Stock Repurchased During Period, Value	(76,556)												(76,556)
Ending Balance at Jun. 30, 2020	$ 3,174,779			145,037		937		1,103,756		2,024,487			(140,883)		41,445
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.80
Dividends on preferred stock (in dollars per share)			$ 656.250
Beginning Balance at Mar. 31, 2020	$ 3,090,242			145,037		937		1,101,324		2,009,541			(141,797)		(24,800)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,097									53,097
Other Comprehensive Income (Loss), Net of Tax	66,245														66,245
Dividends and dividend equivalents declared on common stock	(36,182)									(36,182)
Dividends on preferred stock			$ (1,969)									(1,969)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	3,405							2,432		0			973
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(59)												(59)
Ending Balance at Jun. 30, 2020	$ 3,174,779			145,037		937		1,103,756		2,024,487			(140,883)		41,445
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.40
Dividends on preferred stock (in dollars per share)			$ 328.125
Beginning Balance at Dec. 31, 2020	$ 3,234,625			145,037		937		1,109,532		2,077,522			(140,659)		42,256
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	202,113									202,113
Other Comprehensive Income (Loss), Net of Tax	(36,366)														(36,366)
Dividends and dividend equivalents declared on common stock	(72,537)									(72,537)
Dividends on preferred stock			$ (3,938)									(3,938)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	6,433							(3,311)		0			9,744
Stock Issued During Period, Value, Stock Options Exercised	3,386							(5,095)					8,481
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(4,011)												(4,011)
Ending Balance at Jun. 30, 2021	$ 3,329,705			145,037		937		1,101,126		2,203,160			(126,445)		5,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.80
Dividends on preferred stock (in dollars per share)			$ 656.250
Beginning Balance at Mar. 31, 2021	$ 3,272,928			145,037		937		1,105,137		2,147,436			(133,893)		8,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	94,035									94,035
Other Comprehensive Income (Loss), Net of Tax	(2,384)														(2,384)
Dividends and dividend equivalents declared on common stock	(36,342)									(36,342)
Dividends on preferred stock			$ (1,969)									$ (1,969)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	3,468							(3,960)		0			7,428
Stock Issued During Period, Value, Stock Options Exercised	72							(51)					123
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(103)												(103)
Ending Balance at Jun. 30, 2021	$ 3,329,705			$ 145,037		$ 937		$ 1,101,126		$ 2,203,160			$ (126,445)		$ 5,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.40
Dividends on preferred stock (in dollars per share)			$ 328.125

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 202,113	$ 91,296
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Provision for credit losses	(47,250)	116,000
Deferred Income Tax Expense (Benefit)	16,012	(27,020)
Depreciation, Amortization and Accretion, Net	18,683	18,110
Accretion (Amortization) of Discounts and Premiums, Investments	66,312	27,996
Share-based Payment Arrangement, Noncash Expense	6,433	6,014
Gains (Losses) on Sales of Other Real Estate	(141)	(664)
Gain (Loss) on Disposition of Property Plant Equipment	724	256
Available-for-sale Securities, Gross Realized Gains	0	(8)
Life Insurance, Corporate or Bank Owned, Change in Value	(7,136)	(7,204)
Bank Owned Life Insurance Income	(805)	(348)
Gain (Loss) on Sales of Loans, Net	(3,961)	(7,098)
Proceeds from Sale of Loans Held-for-sale	147,735	170,168
Payments for Origination of Mortgage Loans Held-for-sale	(135,930)	(175,228)
Increase (Decrease) in Financial Instruments Used in Operating Activities	1,336	3,395
Increase (Decrease) in Derivative Assets and Liabilities	106,759	(256,780)
Gain on sale of banking centers	(533)	0
Increase (Decrease) in Other Operating Assets	(91,177)	14,755
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities	34,057	67,239
Net Cash Provided by (Used in) Operating Activities, Total	313,231	40,879
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Debt Securities, Available-for-sale	(504,286)	(479,330)
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	510,484	266,704
Proceeds from Sale of Available-for-sale Securities	0	8,963
Payments to Acquire Held-to-maturity Securities	(775,673)	(529,233)
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities	694,951	382,903
Payments for (Proceeds from) Federal Home Loan Bank Stock	720	54,551
Payments for (Proceeds from) Other Investing Activities	(5,568)	(1,103)
Payments for (Proceeds from) Other Loans and Leases	84,886	(1,797,719)
Proceeds of Other Loans and Leases Held-for-investment	49,122	3,606
Proceeds from Life Insurance Policy	2,683	1,019
Proceeds from Sale of Foreclosed Assets	523	4,667
Proceeds from Sale of Productive Assets	2,413	0
Payments to Acquire Property, Plant, and Equipment	(7,407)	(7,817)
Net Cash Provided by (Used in) Investing Activities, Total	52,848	(2,092,789)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Increase (Decrease) in Deposits	1,510,573	3,030,321
Proceeds from FHLBank Borrowings, Financing Activities	180,470	3,450,000
Payments of FHLBank Borrowings, Financing Activities	(175,190)	(4,875,155)
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	(488,231)	648,374
Payments of Ordinary Dividends, Common Stock	(72,349)	(72,806)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(3,938)	(3,938)
Proceeds from Stock Options Exercised	3,386	118
Payments for Repurchase of Common Stock	0	(76,556)
Payments for Repurchase of Equity, Share-based Compensation	(4,011)	(3,219)
Net Cash Provided by (Used in) Financing Activities, Total	950,710	2,097,139
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	1,316,789	45,229
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance	263,104	257,895
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	1,579,893	303,124
Supplemental Cash Flow Information [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	23,113	77,757
Income Taxes Paid	80,873	11,353
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	829	2,857
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 48,395	$ 3,036

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations Webster Financial Corporation is a bank holding company and financial holding company under the BHC Act, incorporated under the laws of Delaware in 1986, and headquartered in Waterbury, Connecticut. Webster Bank is the principal consolidated subsidiary of Webster Financial Corporation. Webster Bank, including its HSA Bank division, deliver a wide range of banking, investment, and financial services to individuals, families, and businesses. Webster Bank serves consumer and business customers with mortgage lending, financial planning, trust, and investment services through a distribution network consisting of banking centers, ATMs, a customer care center, and a full range of web and mobile-based banking services throughout southern New England and Westchester County, New York. It also offers equipment financing, commercial real estate lending, asset-based lending, and treasury and payment solutions primarily in the eastern U.S. HSA Bank is a leading provider of HSAs, while also delivering health reimbursement arrangements, and flexible spending and commuter benefit account administration services to employers and individuals in all 50 states. Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with GAAP for interim financial information and 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 thereto, for the year ended December 31, 2020, included in our Form 10-K filed with the SEC. In the opinion of management, all necessary adjustments are reflected to present fairly the financial position and results of operations as of the dates and for the periods shown. Operating results for the three and six months ended June 30, 2021 are not necessarily indicative of results that may be attained during the full year ending December 31, 2021, or any future period. There have been no changes to the Company's significant accounting policies from those described within that Form 10-K, except as described within the Recently Adopted Accounting Standards Updates section of this note. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications did not have a significant impact 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 and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Recently Adopted Accounting Standards Updates ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The Accounting Standards Update (the Update) provides simplification to the accounting for income taxes related to a variety of topics and makes minor codification improvements. Changes include a requirement that the effects of an enacted change in tax law be reflected in the computation of the annual effective tax rate in the first interim period that includes the enactment date of the new legislation and clarification on presentation of non-income based taxes. The Company adopted the Update on January 1, 2021 on a prospective basis. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. ASU No. 2021-01, Reference Rate Reform (Topic 848) - Scope. The Update clarifies that certain optional expedients and exceptions provided for in ASU No. 2020-04 for applying GAAP to contract modifications and hedging relationships apply to derivatives that are affected by the discounting transition. The amendments are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. The Update was effective upon issuance for application on either a retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 22, 2020, or on a prospective basis beginning on January 7, 2021. The Company adopted the Update on a prospective basis. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. Accounting Standards Issued But Not Yet Adopted The Company has adopted all applicable Accounting Standards Updates issued by the Financial Accounting Standards Board (FASB) as of June 30, 2021.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
Variable Interest Entities	Jun. 30, 2021
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. Investments held in the Rabbi Trust primarily consist of mutual funds that invest in equity and fixed income securities. The Company is considered the primary beneficiary of the Rabbi Trust as it has the power to direct the activities of the Rabbi Trust that most 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, on the accompanying Condensed Consolidated Balance Sheets. Earnings in the Rabbi Trust, including appreciation or depreciation, are reflected as other non-interest income, and changes in the corresponding liability are reflected as compensation and benefits, on the accompanying Condensed Consolidated Statement of Income. Refer to Note 15: Fair Value Measurements for additional information. Non-Consolidated 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 the Company is not the primary beneficiary. 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 and the Company does not have the obligation to absorb expected losses or the right to receive residual returns. The Company applies the proportional amortization method to account for its investments in qualified affordable housing projects. At June 30, 2021 and December 31, 2020, the aggregate carrying value of the Company's tax credit-finance investments was $44.7 million and $37.2 million, respectively, which represents the Company's maximum exposure to loss. At June 30, 2021 and December 31, 2020, unfunded commitments have been recognized, totaling $12.7 million and $10.2 million, respectively, and are included in accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets. 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 on the accompanying Condensed Consolidated Balance Sheets, and the related interest expense is reported as interest expense on long-term debt on the accompanying Condensed Consolidated Statements of Income. Refer to Note 10: Borrowings for additional information. 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, 2021 and December 31, 2020, the aggregate carrying value of the Company's other non-marketable investments in VIEs was $44.7 million and $34.3 million, respectively, and the maximum exposure to loss of the Company's other non-marketable investments in VIEs, including unfunded commitments, was $78.2 million and $72.7 million, respectively. Refer to Note 15: Fair Value Measurements for additional information. The Company's equity interests in Other Non-Marketable Investments, as well as Tax Credit-Finance Investments and Webster Statutory Trust, are included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. 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, 2020.

Investment Securities

Investment Securities	6 Months Ended
Investment Securities	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Held-to-Maturity Securities A summary of the amortized cost, fair value, and allowance for credit losses on investment securities held-to-maturity is presented below: At June 30, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 61,080 $ 1,425 $ (63) $ 62,442 $ — $ 61,080 Agency MBS 2,562,863 96,187 (3,684) 2,655,366 — 2,562,863 Agency CMBS 2,105,924 30,491 (16,545) 2,119,870 — 2,105,924 Municipal bonds and notes 715,195 56,218 — 771,413 382 714,813 CMBS 178,563 6,501 — 185,064 — 178,563 Held-to-maturity securities $ 5,623,625 $ 190,822 $ (20,292) $ 5,794,155 $ 382 $ 5,623,243 At December 31, 2020 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 91,622 $ 1,785 $ (241) $ 93,166 $ — $ 91,622 Agency MBS 2,419,751 137,863 (84) 2,557,530 — 2,419,751 Agency CMBS 2,101,227 60,484 (2,213) 2,159,498 — 2,101,227 Municipal bonds and notes 739,507 60,371 (3) 799,875 299 739,208 CMBS 216,081 9,214 — 225,295 — 216,081 Held-to-maturity securities $ 5,568,188 $ 269,717 $ (2,541) $ 5,835,364 $ 299 $ 5,567,889 (1) Amortized cost excludes accrued interest receivable of $20.9 million and $22.1 million at June 30, 2021 and December 31, 2020, respectively, which is included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. Agency securities represent obligations issued by a U.S. government-sponsored enterprise or other federally-related entity and are either explicitly or implicitly guaranteed, and therefore, assumed to be zero loss. Securities with unrealized losses and no allowance are considered to be of high credit quality, and therefore, zero credit loss is recorded as of June 30, 2021. The current unrealized loss position of certain agency securities and non-agency CMBS with no credit loss allowance can be attributed to the changing interest rate environment. An allowance for credit losses on investment securities held-to-maturity is recorded for certain Municipal bonds and notes to account for expected lifetime credit losses. The following table summarizes the activity in the allowance for credit losses on investment securities held-to-maturity: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Balance beginning of period $ 308 $ 312 $ 299 $ — Adoption of ASU No. 2016-13 (CECL) — — — 397 Provision (benefit) for credit losses 74 (3) 83 (88) Balance end of period $ 382 $ 309 $ 382 $ 309 Credit Quality Information The Company monitors the credit quality of held-to-maturity debt securities through credit ratings provided by Standard & Poor's Rating Services (S&P), Moody's Investor Services (Moody's), Fitch Ratings, Inc., Kroll Bond Rating Agency, or DBRS Inc. Credit ratings express opinions about the credit quality of a security. Investment grade securities are rated BBB- or higher by S&P, or Baa3 or higher by Moody's, and are generally considered by the rating agencies and market participants to be of low credit risk. Conversely, securities rated below investment grade, labeled as speculative grade by the rating agencies, are considered to have distinctively higher credit risk than investment grade securities. At June 30, 2021, there were no held-to-maturity investment securities rated below investment grade. The securities illustrated below that are not rated are collateralized with U.S. Government obligations, and credit quality indicators are updated at each quarter end. The following table summarizes credit ratings for the amortized cost of held-to-maturity debt securities according to their lowest public credit rating at June 30, 2021: Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Baa2 Not Rated Agency CMOs $ — $ 61,080 $ — $ — $ — $ — $ — $ — $ — Agency MBS — 2,562,863 — — — — — — — Agency CMBS — 2,105,924 — — — — — — — Municipal bonds and notes 208,615 120,173 227,856 108,619 36,087 8,468 2,066 190 3,121 CMBS 178,563 — — — — — — — — Total held-to-maturity $ 387,178 $ 4,850,040 $ 227,856 $ 108,619 $ 36,087 $ 8,468 $ 2,066 $ 190 $ 3,121 At June 30, 2021, there were no held-to-maturity investment securities in non-accrual status. Contractual Maturities The amortized cost and fair value of held-to-maturity debt securities presented by contractual maturity are set forth below: At June 30, 2021 (In thousands) Amortized Fair Due in one year or less $ 380 $ 384 Due after one year through five years 4,843 5,163 Due after five years through ten years 285,191 298,449 Due after ten years 5,333,211 5,490,159 Total held-to-maturity debt securities $ 5,623,625 $ 5,794,155 For the maturity schedule above, investment securities that 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 repay obligations with or without prepayment penalties. Available-for-Sale Securities A summary of the amortized cost and fair value of available-for-sale securities is presented below: At June 30, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value (2) Agency CMO $ 115,985 $ 4,366 $ (23) $ 120,328 Agency MBS 1,339,769 47,666 (4,905) 1,382,530 Agency CMBS 939,055 10,509 (8,167) 941,397 CMBS 754,192 1,008 (230) 754,970 CLO 50,000 8 (44) 49,964 Corporate debt 14,569 11 (876) 13,704 Available-for-sale securities $ 3,213,570 $ 63,568 $ (14,245) $ 3,262,893 At December 31, 2020 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value (2) Agency CMO $ 148,711 $ 6,000 $ (98) $ 154,613 Agency MBS 1,389,100 68,598 (289) 1,457,409 Agency CMBS 1,092,430 26,317 (1,514) 1,117,233 CMBS 512,759 1,082 (5,823) 508,018 CLO 76,693 — (310) 76,383 Corporate debt 14,557 — (1,437) 13,120 Available-for-sale securities $ 3,234,250 $ 101,997 $ (9,471) $ 3,326,776 (1) Amortized cost excludes accrued interest receivable of $6.7 million and $7.5 million at June 30, 2021 and December 31, 2020, respectively, which is included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. (2) Fair value represents net carrying value as there is no allowance for credit losses recorded on investment securities available-for-sale, as the securities are high credit quality and investment grade. Fair Value and Unrealized Losses The following table provides information on fair value and unrealized losses for the individual available-for-sale securities with an unrealized loss, for which an allowance for credit losses on investment securities available-for-sale has not been recorded, aggregated by classification and length of time that the individual investment securities have been in a continuous unrealized loss position: At June 30, 2021 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized # of Fair Unrealized Agency CMO $ 3,879 $ (8) $ 2,580 $ (15) 3 $ 6,459 $ (23) Agency MBS 224,986 (4,687) 15,482 (218) 46 240,468 (4,905) Agency CMBS 421,812 (8,167) — — 11 421,812 (8,167) CMBS 285,792 (125) 117,796 (105) 29 403,588 (230) CLO — — 24,956 (44) 1 24,956 (44) Corporate debt — — 9,422 (876) 2 9,422 (876) Available-for-sale in unrealized loss position $ 936,469 $ (12,987) $ 170,236 $ (1,258) 92 $ 1,106,705 $ (14,245) At December 31, 2020 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized # of Fair Unrealized Agency CMO $ 13,137 $ (49) $ 5,944 $ (49) 5 $ 19,081 $ (98) Agency MBS 33,742 (219) 4,561 (70) 30 38,303 (289) Agency CMBS 376,330 (1,514) — — 8 376,330 (1,514) CMBS 409,591 (5,486) 23,167 (337) 38 432,758 (5,823) CLO 57,728 (265) 18,655 (45) 4 76,383 (310) Corporate debt 4,100 (166) 9,020 (1,271) 3 13,120 (1,437) Available-for-sale in unrealized loss position $ 894,628 $ (7,699) $ 61,347 $ (1,772) 88 $ 955,975 $ (9,471) Unrealized losses on available-for-sale debt securities presented in the previous table have not been recognized in the accompanying Condensed Consolidated Statements of Income based on impairment analysis. The Company does not intend and is not required to sell prior to their anticipated recovery because the securities are investment grade, and the decline in fair value is primarily attributable to higher market rates. Fair value is expected to recover as the securities approach maturity. At June 30, 2021, there were no available-for-sale investment securities in non-accrual status. Contractual Maturities The amortized cost and fair value of available-for-sale debt securities presented by contractual maturity are set forth below: At June 30, 2021 (In thousands) Amortized Fair Due in one year or less $ — $ — Due after one year through five years 2,614 2,703 Due after five through ten years 183,925 184,105 Due after ten years 3,027,031 3,076,085 Total available-for-sale debt securities $ 3,213,570 $ 3,262,893 For the maturity schedule above, investment securities that 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 repay obligations with or without prepayment penalties. Sales of Available-for Sale Investment Securities There were no sales of available-for-sale securities during the three and six months ended June 30, 2021, nor during the three months ended June 30, 2020. For the six months ended June 30, 2020, proceeds from sales of available-for-sale securities were $9.0 million, which resulted in realized gains of $8.0 thousand. Other Information At June 30, 2021, the Company had a carrying value of $1.5 billion in callable debt securities in its CMBS, CLO, and municipal bond portfolios. The Company considers this prepayment risk in the evaluation of its interest rate risk profile. Held-to-maturity and available-for-sale investment securities with carrying values of $2.7 billion and $1.4 billion at June 30, 2021, respectively, and $2.6 billion and $1.3 billion at December 31, 2020, respectively, 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
Loans and Leases	Jun. 30, 2021
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, 2020 Commercial non-mortgage $ 6,843,415 $ 7,085,076 Asset-based 943,961 890,598 Commercial real estate 6,410,672 6,322,637 Equipment financing 630,343 602,224 Commercial portfolio 14,828,391 14,900,535 Residential 4,856,302 4,782,016 Home equity 1,677,136 1,802,865 Other consumer 113,172 155,799 Consumer portfolio 6,646,610 6,740,680 Loans and leases (1) (2) (3) $ 21,475,001 $ 21,641,215 (1) Loan balances include net deferred (fees)/costs and net (premiums)/discounts of $(13.5) million and $(10.5) million at June 30, 2021 and December 31, 2020, respectively. (2) At June 30, 2021, the Company had pledged $7.3 billion of eligible loans as collateral to support borrowing capacity at the FHLB of Boston and the FRB of Boston. (3) Loan balances exclude accrued interest receivable of $54.6 million and $57.8 million at June 30, 2021 and December 31, 2020, respectively, which is included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. Equipment financing includes net investment in leases of $222.3 million and $236.1 million at June 30, 2021 and December 31, 2020, respectively. Total undiscounted cash flows, primarily due within the next five years, amounted to $241.7 million at June 30, 2021. This lessor activity resulted in interest income of $1.9 million and $1.8 million for the three months ended June 30, 2021 and 2020, respectively, and $3.8 million and $3.4 million for the six months ended June 30, 2021 and 2020, respectively. Loans and Leases Aging The following table summarizes the aging of loans and leases: At June 30, 2021 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans Commercial non-mortgage $ 1,017 $ 127 $ 25 $ 49,513 $ 50,682 $ 6,792,733 $ 6,843,415 Asset-based — — — 2,375 2,375 941,586 943,961 Commercial real estate 1,324 364 — 12,695 14,383 6,396,289 6,410,672 Equipment financing 1,578 438 — 8,162 10,178 620,165 630,343 Commercial portfolio 3,919 929 25 72,745 77,618 14,750,773 14,828,391 Residential 3,891 805 — 21,472 26,168 4,830,134 4,856,302 Home equity 5,429 2,604 — 25,975 34,008 1,643,128 1,677,136 Other consumer 479 336 — 412 1,227 111,945 113,172 Consumer portfolio 9,799 3,745 — 47,859 61,403 6,585,207 6,646,610 Total $ 13,718 $ 4,674 $ 25 $ 120,604 $ 139,021 $ 21,335,980 $ 21,475,001 At December 31, 2020 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans Commercial non-mortgage $ 612 $ 903 $ 445 $ 64,073 $ 66,033 $ 7,019,043 $ 7,085,076 Asset-based 1,174 — — 2,594 3,768 886,830 890,598 Commercial real estate 2,400 619 — 21,231 24,250 6,298,387 6,322,637 Equipment financing 5,107 2,308 — 7,299 14,714 587,510 602,224 Commercial portfolio 9,293 3,830 445 95,197 108,765 14,791,770 14,900,535 Residential 4,334 6,330 — 41,081 51,745 4,730,271 4,782,016 Home equity 5,500 1,771 — 31,030 38,301 1,764,564 1,802,865 Other consumer 878 601 — 652 2,131 153,668 155,799 Consumer portfolio 10,712 8,702 — 72,763 92,177 6,648,503 6,740,680 Total $ 20,005 $ 12,532 $ 445 $ 167,960 $ 200,942 $ 21,440,273 $ 21,641,215 The following table provides additional detail related to loans and leases on non-accrual status: At June 30, 2021 At December 31, 2020 (In thousands) Non-accrual Non-accrual With No Allowance Non-accrual Non-accrual With No Allowance Commercial non-mortgage $ 49,513 $ 8,386 $ 64,073 $ 16,985 Asset-based 2,375 2,375 2,594 — Commercial real estate 12,695 554 21,231 15,529 Equipment financing 8,162 2,538 7,299 2,983 Commercial portfolio 72,745 13,853 95,197 35,497 Residential 21,472 12,680 41,081 29,843 Home equity 25,975 20,620 31,030 24,091 Other consumer 412 6 652 2 Consumer portfolio 47,859 33,306 72,763 53,936 Total $ 120,604 $ 47,159 $ 167,960 $ 89,433 Interest on non-accrual residential and home equity loans, which would have been recorded as additional interest income had the loans been current in accordance with the original terms, totaled $2.9 million and $3.8 million for the three months ended June 30, 2021 and 2020, respectively, and $6.1 million and $6.8 million for the six months ended June 30, 2021 and 2020, respectively. Refer to Note 1 to the Consolidated Financial Statements included in the Company's Form 10-K for the year ended December 31, 2020, for details of non-accrual policies. Allowance for Credit Losses on Loans and Leases The following table summarizes the activity in, as well as the loan and lease balances that were evaluated for, ACL on loans and leases: At or for the three months ended June 30, 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 283,906 $ 44,445 $ 328,351 $ 261,926 $ 73,005 $ 334,931 (Benefit) provision (21,077) (497) (21,574) 44,605 (4,602) 40,003 Charge-offs (594) (2,808) (3,402) (15,294) (2,780) (18,074) Recoveries 836 3,734 4,570 283 1,379 1,662 Balance, end of period $ 263,071 $ 44,874 $ 307,945 $ 291,520 $ 67,002 $ 358,522 At or for the six months ended June 30, 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 312,244 $ 47,187 $ 359,431 $ 161,669 $ 47,427 $ 209,096 Adoption of ASU No. 2016-13 (CECL) — — — 34,024 23,544 57,568 (Benefit) provision (44,730) (2,603) (47,333) 115,848 240 116,088 Charge-offs (6,915) (5,782) (12,697) (20,868) (7,367) (28,235) Recoveries 2,472 6,072 8,544 847 3,158 4,005 Balance, end of period $ 263,071 $ 44,874 $ 307,945 $ 291,520 $ 67,002 $ 358,522 Individually evaluated for impairment 11,537 4,560 16,097 15,271 4,484 19,755 Collectively evaluated for impairment $ 251,534 $ 40,314 $ 291,848 $ 276,249 $ 62,518 $ 338,767 Loan and lease balances: Individually evaluated for impairment $ 128,937 $ 110,521 $ 239,458 $ 165,010 $ 158,146 $ 323,156 Collectively evaluated for impairment 14,699,454 6,536,089 21,235,543 14,589,073 6,890,288 21,479,361 Loans and leases $ 14,828,391 $ 6,646,610 $ 21,475,001 $ 14,754,083 $ 7,048,434 $ 21,802,517 Credit Quality Indicators. To measure credit risk for the commercial portfolio, the Company employs a dual grade credit risk grading system for estimating the PD and 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 loss. Grades (1) to (6) are considered pass ratings, and grades (7) to (10) are considered criticized, as defined by the regulatory agencies. Risk ratings assigned in order to differentiate risk within the portfolio are reviewed on an ongoing basis and revised to reflect changes in a borrowers’ current financial position and outlook, risk profile, and the related collateral and structural position. Loan officers review updated financial information on at least an annual basis for all pass rated loans to assess the accuracy of the risk grade. Criticized loans undergo more frequent reviews and enhanced monitoring. A (7) - "Special Mention" rating has the potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the credit. An (8) - "Substandard" rating has a well-defined weakness that jeopardizes the full repayment of the debt. A (9) - "Doubtful" rating has all of the same weaknesses as a substandard credit with the added characteristic that the weakness makes collection or liquidation in full improbably, given current facts, conditions, and values. Credits when classified as (10) - "Loss", in accordance with regulatory guidelines, are considered uncollectible and charged off. The following tables summarize commercial, commercial real estate, and equipment financing loans and leases segregated by origination year and risk rating exposure under the Composite Credit Risk Profile grades at June 30, 2021 and December 31, 2020: At June 30, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage Pass $ 1,380,022 $ 1,635,700 $ 921,484 $ 705,932 $ 363,486 $ 398,483 $ 1,068,452 $ 6,473,559 Special mention — 8,973 48,957 56,527 119 16,621 13,134 144,331 Substandard 106 66,050 20,294 66,010 24,011 23,257 25,797 225,525 Commercial non-mortgage 1,380,128 1,710,723 990,735 828,469 387,616 438,361 1,107,383 6,843,415 Asset-based Pass 3,744 27,329 15,127 19,540 6,431 25,584 779,349 877,104 Special mention — — — 725 — — 63,757 64,482 Substandard — — 2,375 — — — — 2,375 Asset-based 3,744 27,329 17,502 20,265 6,431 25,584 843,106 943,961 Commercial real estate Pass 447,624 925,584 1,451,104 1,130,513 491,810 1,565,554 24,998 6,037,187 Special mention 440 2,221 9,182 79,499 54,481 113,566 — 259,389 Substandard — 808 780 21,567 43,028 47,913 — 114,096 Commercial real estate 448,064 928,613 1,461,066 1,231,579 589,319 1,727,033 24,998 6,410,672 Equipment financing Pass 132,213 219,007 123,041 57,096 19,368 47,107 — 597,832 Special mention — 885 4,362 64 99 1,165 — 6,575 Substandard — 9,630 4,943 6,702 2,180 2,481 — 25,936 Equipment financing 132,213 229,522 132,346 63,862 21,647 50,753 — 630,343 Commercial portfolio $ 1,964,149 $ 2,896,187 $ 2,601,649 $ 2,144,175 $ 1,005,013 $ 2,241,731 $ 1,975,487 $ 14,828,391 At December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage Pass $ 2,771,373 $ 1,052,080 $ 907,110 $ 481,321 $ 231,280 $ 218,001 $ 936,592 $ 6,597,757 Special mention 32,535 33,969 62,034 435 8,357 13,757 38,496 189,583 Substandard 54,716 51,798 66,324 36,159 15,535 23,957 49,084 297,573 Doubtful — — — 163 — — — 163 Commercial non-mortgage 2,858,624 1,137,847 1,035,468 518,078 255,172 255,715 1,024,172 7,085,076 Asset-based Pass 26,344 15,960 23,123 11,333 10,963 16,484 741,336 845,543 Special mention — — 775 — — — 41,687 42,462 Substandard — 2,504 — — — — 89 2,593 Asset-based 26,344 18,464 23,898 11,333 10,963 16,484 783,112 890,598 Commercial real estate Pass 965,582 1,461,201 1,242,322 527,931 554,630 1,165,331 28,113 5,945,110 Special mention 27 10,385 70,704 37,539 35,617 69,832 — 224,104 Substandard 817 1,132 21,923 73,621 2,962 52,968 — 153,423 Commercial real estate 966,426 1,472,718 1,334,949 639,091 593,209 1,288,131 28,113 6,322,637 Equipment financing Pass 249,370 135,263 68,092 26,433 43,469 22,879 — 545,506 Special mention 7,934 11,043 6,981 1,220 1,577 788 — 29,543 Substandard 7,483 6,169 5,749 2,460 4,743 571 — 27,175 Equipment financing 264,787 152,475 80,822 30,113 49,789 24,238 — 602,224 Commercial portfolio $ 4,116,181 $ 2,781,504 $ 2,475,137 $ 1,198,615 $ 909,133 $ 1,584,568 $ 1,835,397 $ 14,900,535 To measure credit risk for the consumer portfolio, the most relevant credit characteristic is the FICO score, which is a widely used credit scoring system that ranges from 300 to 850. A lower FICO score is indicative of higher credit risk. FICO scores are updated at least quarterly. The following tables summarize residential and consumer loans segregated by origination year and risk rating exposure under FICO score groupings at June 30, 2021 and December 31, 2020: At June 30, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Residential 800+ $ 216,867 $ 443,796 $ 189,777 $ 41,846 $ 140,310 $ 871,273 $ — $ 1,903,869 740-799 529,874 526,584 210,767 49,417 100,206 550,153 — 1,967,001 670-739 187,435 158,404 85,483 24,678 49,323 265,179 — 770,502 580-669 15,047 11,478 8,213 4,887 11,003 86,098 — 136,726 579 and below 270 411 37,612 1,831 1,216 36,864 — 78,204 Residential 949,493 1,140,673 531,852 122,659 302,058 1,809,567 — 4,856,302 Home equity 800+ 16,759 32,346 12,233 19,613 13,742 66,580 516,121 677,394 740-799 22,141 27,472 10,892 15,092 8,752 43,852 414,822 543,023 670-739 7,528 11,250 7,484 10,464 7,055 42,004 239,265 325,050 580-669 42 1,426 1,923 1,539 2,527 16,935 71,886 96,278 579 and below 110 365 718 984 368 6,214 26,632 35,391 Home equity 46,580 72,859 33,250 47,692 32,444 175,585 1,268,726 1,677,136 Other consumer 800+ 287 1,912 4,131 1,542 436 139 6,735 15,182 740-799 354 8,355 13,497 5,221 766 394 8,145 36,732 670-739 2,094 11,331 21,734 6,653 1,312 362 6,554 50,040 580-669 114 1,604 4,060 1,267 490 259 1,337 9,131 579 and below 93 189 294 241 83 47 1,140 2,087 Other consumer 2,942 23,391 43,716 14,924 3,087 1,201 23,911 113,172 Consumer portfolio 999,015 1,236,923 608,818 185,275 337,589 1,986,353 1,292,637 6,646,610 Commercial portfolio 1,964,149 2,896,187 2,601,649 2,144,175 1,005,013 2,241,731 1,975,487 14,828,391 Loans and leases $ 2,963,164 $ 4,133,110 $ 3,210,467 $ 2,329,450 $ 1,342,602 $ 4,228,084 $ 3,268,124 $ 21,475,001 At December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Residential 800+ $ 360,336 $ 283,755 $ 61,048 $ 178,849 $ 268,044 $ 805,537 $ — $ 1,957,569 740-799 654,973 288,173 58,249 133,416 176,286 492,720 — 1,803,817 670-739 199,329 118,620 39,125 75,375 76,666 248,268 — 757,383 580-669 17,151 19,389 8,884 11,843 12,225 96,333 — 165,825 579 and below — 36,498 673 3,278 3,179 53,794 — 97,422 Residential 1,231,789 746,435 167,979 402,761 536,400 1,696,652 — 4,782,016 Home equity 800+ 30,604 16,567 25,205 14,439 17,192 59,956 542,600 706,563 740-799 34,797 13,565 19,715 11,073 12,839 43,802 434,271 570,062 670-739 13,753 8,855 10,761 10,206 7,318 44,025 275,691 370,609 580-669 1,708 2,172 2,660 2,234 2,316 16,680 86,126 113,896 579 and below 129 919 880 1,070 1,073 7,163 30,501 41,735 Home equity 80,991 42,078 59,221 39,022 40,738 171,626 1,369,189 1,802,865 Other consumer 800+ 2,827 5,725 2,610 658 115 190 7,171 19,296 740-799 12,317 21,036 8,925 1,493 457 263 5,119 49,610 670-739 14,761 31,952 11,843 2,284 665 228 8,403 70,136 580-669 2,344 5,419 2,360 793 194 124 1,570 12,804 579 and below 608 982 500 183 37 215 1,428 3,953 Other consumer 32,857 65,114 26,238 5,411 1,468 1,020 23,691 155,799 Consumer portfolio 1,345,637 853,627 253,438 447,194 578,606 1,869,298 1,392,880 6,740,680 Commercial portfolio 4,116,181 2,781,504 2,475,137 1,198,615 909,133 1,584,568 1,835,397 14,900,535 Loans and leases $ 5,461,818 $ 3,635,131 $ 2,728,575 $ 1,645,809 $ 1,487,739 $ 3,453,866 $ 3,228,277 $ 21,641,215 Individually Assessed Loans and Leases The following table summarizes individually assessed loans and leases: At June 30, 2021 (In thousands) Unpaid Amortized Cost Amortized Cost No Allowance Amortized Cost With Allowance Related Commercial non-mortgage $ 122,891 $ 97,270 $ 43,936 $ 53,334 $ 8,488 Asset-based 2,499 2,375 2,375 — — Commercial real estate 24,581 21,130 7,329 13,801 1,808 Equipment financing 8,621 8,162 2,538 5,624 1,241 Residential 72,749 68,823 36,092 32,731 2,770 Home equity 46,364 41,286 30,162 11,124 1,668 Other consumer 412 412 6 406 122 Total $ 278,117 $ 239,458 $ 122,438 $ 117,020 $ 16,097 At December 31, 2020 (In thousands) Unpaid Amortized Cost Amortized Cost No Allowance Amortized Cost With Allowance Related Commercial non-mortgage $ 172,069 $ 119,884 $ 55,742 $ 64,142 $ 9,665 Asset-based 2,989 2,594 — 2,594 50 Commercial real estate 37,177 33,879 25,931 7,948 1,610 Equipment financing 7,770 7,298 2,983 4,315 362 Residential 108,077 98,164 58,915 39,249 3,357 Home equity 109,156 46,950 34,335 12,615 988 Other consumer 2,381 653 2 651 105 Total $ 439,619 $ 309,422 $ 177,908 $ 131,514 $ 16,137 The following table summarizes average amortized cost and interest income recognized for individually assessed loans and leases: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In thousands) Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Commercial non-mortgage $ 105,811 $ 682 $ — $ 136,483 $ 875 $ — $ 108,577 $ 1,541 $ — $ 115,903 $ 1,928 $ — Asset-based 2,389 — — 138 — — 2,485 — — 139 — — Commercial real estate 23,721 126 — 26,017 169 — 27,505 308 — 25,411 315 — Equipment financing 7,121 — — 8,373 — — 7,730 — — 6,613 — — Residential 80,670 577 168 121,488 781 230 83,494 1,216 441 113,806 1,611 860 Home equity 44,120 287 302 50,573 309 413 44,118 509 516 43,863 700 1,243 Other consumer 504 — — 1,121 — — 533 — — 609 17 — Total $ 264,336 $ 1,672 $ 470 $ 344,193 $ 2,134 $ 643 $ 274,442 $ 3,574 $ 957 $ 306,344 $ 4,571 $ 2,103 Collateral Dependent Loans and Leases. A loan is considered collateral dependent when the borrower is experiencing financial difficulty and repayment is substantially expected through the operation or sale of collateral. A collateral dependent loan is individually assessed based on the fair value of the collateral, less costs to sell, as of the reporting date. Commercial non-mortgage, asset based, and equipment financing loans are collateralized by equipment, inventory, receivables, or other non-real estate assets. Commercial real estate, residential, and home equity loans are collateralized by real estate. Collateral value on collateral dependent loans and leases was $107.0 million at June 30, 2021 and $150.3 million at December 31, 2020. The following table summarizes whether, or not, individually assessed loans and leases are collateral dependent: At June 30, 2021 At December 31, 2020 (In thousands) Collateral Dependent Not Considered Collateral Dependent Total Collateral Dependent Not Considered Collateral Dependent Total Commercial non-mortgage $ 18,496 $ 78,774 $ 97,270 $ 11,074 $ 108,810 $ 119,884 Asset-based 2,375 — 2,375 2,504 90 2,594 Commercial real estate 17,598 3,532 21,130 28,482 5,397 33,879 Equipment financing — 8,162 8,162 — 7,298 7,298 Residential 17,649 51,174 68,823 33,980 64,184 98,164 Home equity 22,494 18,792 41,286 26,796 20,154 46,950 Other consumer — 412 412 — 653 653 Total amortized cost $ 78,612 $ 160,846 $ 239,458 $ 102,836 $ 206,586 $ 309,422 Troubled Debt Restructurings The following table summarizes information for TDRs: (In thousands) At June 30, 2021 At December 31, 2020 Accrual status $ 119,707 $ 140,089 Non-accrual status 64,636 95,338 Total TDRs $ 184,343 $ 235,427 Specific reserves for TDRs included in the balance of ACL on loans and leases $ 11,726 $ 12,728 Additional funds committed to borrowers in TDR status 13,512 12,895 The portion of TDRs deemed to be uncollectible, $0.3 million and $1.9 million for the three months ended June 30, 2021 and 2020, respectively, and $2.2 million and $3.1 million for the six months ended June 30, 2021 and 2020, respectively, were charged off. The following table provides information on the type of concession for loans modified as TDRs: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) (Dollars in thousands) Commercial portfolio Extended Maturity 1 $ 50 5 $ 475 8 $ 740 7 $ 579 Maturity/Rate Combined 5 173 — — 6 210 6 552 Other (2) 1 1 13 12,985 3 114 23 40,122 Consumer portfolio Extended Maturity — — 3 244 2 127 4 508 Maturity/Rate Combined 3 415 2 255 8 1,426 6 711 Other (2) 7 535 80 7,461 16 1,201 94 9,187 Total TDRs 17 $ 1,174 103 $ 21,420 43 $ 3,818 140 $ 51,659 (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 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, 2021 and 2020. TDRs in commercial non-mortgage, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: (In thousands) At June 30, 2021 At December 31, 2020 Pass $ 8,740 $ 12,462 Special Mention 8,670 — Substandard 72,996 105,070 Doubtful — 163 Total $ 90,406 $ 117,695

Transfers of Financial Assets

Transfers of Financial Assets	6 Months Ended
Transfers of Financial Assets	Jun. 30, 2021
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, and gains or losses on loans sold are included as mortgage banking activities on the accompanying Condensed Consolidated Statements of Income. The Company may be required to repurchase a loan in the event of certain breaches of the representations and warranties, or in the event of default of the borrower within 90 days of sale, as provided for in the sale agreements. A reserve for loan repurchases provides for estimated losses pertaining to the potential repurchase of loans associated with the Company’s mortgage banking activities. The reserve reflects 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. The provision recorded at the time of the loan sale is netted from the gain or loss recorded in mortgage banking activities, while any incremental provision, post loan sale, is recorded in other non-interest expense in the accompanying Condensed Consolidated Statements of Income. The following table provides a summary of activity in the reserve for loan repurchases: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Beginning balance $ 770 $ 633 $ 747 $ 508 Provision charged to expense 20 27 43 49 (Charge-offs/settlements) recoveries, net (8) (5) (8) 98 Ending balance $ 782 $ 655 $ 782 $ 655 The following table provides information for mortgage banking activities: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Residential mortgage loans held for sale: Proceeds from sale $ 68,427 $ 94,574 $ 147,735 $ 170,168 Loans sold with servicing rights retained 66,087 89,687 141,778 161,778 Net gain on sale 1,351 2,824 3,460 5,343 Ancillary fees 377 824 918 1,225 Fair value option adjustment (409) 557 (417) 530 Additionally, certain commercial and consumer loans not originated for sale were sold for cash proceeds of $49.1 million for the six months ended June 30, 2021, resulting in a gain of $718 thousand, and $3.6 million for the six months ended June 30, 2020, resulting in a gain of $256 thousand. The Company services residential mortgage loans for other entities totaling $2.2 billion at June 30, 2021 and $2.3 billion at December 31, 2020. 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) 2021 2020 2021 2020 Beginning balance $ 12,327 $ 16,391 $ 13,422 $ 17,484 Additions 616 779 1,202 1,968 Amortization (1,442) (1,669) (2,932) (3,376) Adjustment to valuation allowance — (575) (191) (1,150) Ending balance $ 11,501 $ 14,926 $ 11,501 $ 14,926 Loan servicing fees, net of mortgage servicing rights amortization, were $0.2 million and $0.3 million for the three months ended June 30, 2021 and 2020, respectively, and $0.6 million and $0.8 million for the six months ended June 30, 2021 and 2020, respectively, and are included within loan and lease related fees on the accompanying Condensed Consolidated Statements of Income. Refer to Note 15: Fair Value Measurements for additional information on loans held for sale and mortgage servicing assets.

Leases

Leases	6 Months Ended
Leases	Jun. 30, 2021
Leases [Abstract]
Leases	Leasing The Company enters into operating leases, as lessee, primarily for office space, banking centers, and certain other operational assets. The Company's operating leases generally have lease terms for periods of 5 to 20 years with various renewal options. The Company does not have any material sub-lease agreements. The following table summarizes lessee information related to the Company’s operating ROU lease assets and lease liabilities: At June 30, 2021 (In thousands) Operating Leases Condensed Consolidated Balance Sheet Line Item Location ROU lease assets $ 126,145 Premises and equipment, net Lease liabilities 154,461 Operating lease liabilities The components of operating lease cost and other related information are as follows: At or for the three months ended June 30, At or for the six months ended June 30, (In thousands) 2021 2020 2021 2020 Lease Cost: Operating lease costs $ 6,554 $ 7,407 $ 13,111 $ 14,831 Variable lease costs 1,351 1,493 2,651 2,920 Sublease income (140) (142) (271) (287) Total operating lease cost $ 7,765 $ 8,758 $ 15,491 $ 17,464 Other Information: Cash paid for amounts included in the measurement of lease liabilities $ 7,672 $ 7,778 $ 15,505 $ 15,536 ROU lease assets obtained in exchange for new operating lease liabilities 4,160 30 9,558 8,696 The undiscounted scheduled maturities reconciled to total operating lease liabilities are as follows: (In thousands) At June 30, 2021 Remainder of 2021 $ 12,611 2022 28,144 2023 25,900 2024 23,120 2025 21,154 Thereafter 65,902 Total operating lease liability payments 176,831 Less: Present value adjustment 22,370 Lease liabilities $ 154,461 Weighted-average remaining lease term, in years 7.82 Weighted-average discount rate 3.10%

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
Goodwill and Other Intangible Assets	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets There has been no change during the three and six months ended June 30, 2021 in the carrying amount for goodwill. For goodwill by reportable segment, refer to Note 17: Segment Reporting. Other intangible assets by reportable segment consisted of the following: At June 30, 2021 At December 31, 2020 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying HSA Bank - Core deposits $ 26,625 $ 17,080 $ 9,545 $ 26,625 $ 15,618 $ 11,007 HSA Bank - Customer relationships 21,000 10,433 10,567 21,000 9,624 11,376 Total other intangible assets $ 47,625 $ 27,513 $ 20,112 $ 47,625 $ 25,242 $ 22,383 At June 30, 2021, the remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) Remainder of 2021 $ 2,242 2022 4,411 2023 4,315 2024 2,084 2025 2,084 Thereafter 4,976

Deposits

Deposits	6 Months Ended
Deposits	Jun. 30, 2021
Deposit Liabilities [Abstract]
Deposits	Deposits A summary of deposits by type is as follows: (In thousands) At June 30, At December 31, Non-interest-bearing: Demand $ 6,751,373 $ 6,155,592 Interest-bearing: Health savings accounts 7,323,421 7,120,017 Checking 3,843,725 3,652,763 Money market 3,442,319 2,940,215 Savings 5,471,584 4,979,031 Time deposits 2,014,544 2,487,818 Total interest-bearing $ 22,095,593 $ 21,179,844 Total deposits $ 28,846,966 $ 27,335,436 Time deposits and interest-bearing checking obtained through brokers (included in above balances) $ 112,732 $ 720,440 Time deposits that exceed the FDIC limit (included in above balance) 337,866 504,543 Deposit overdrafts reclassified as loan balances 1,050 2,007 The scheduled maturities of time deposits are as follows: (In thousands) At June 30, Remainder of 2021 $ 1,253,018 2022 566,946 2023 91,793 2024 39,125 2025 50,983 Thereafter 12,679 Total time deposits $ 2,014,544

Borrowings

Borrowings	6 Months Ended
Borrowings	Jun. 30, 2021
Debt Disclosure [Abstract]
Borrowings	Borrowings Total borrowings of $1.2 billion at June 30, 2021 and $1.7 billion at December 31, 2020 are described in detail below. The following table summarizes securities sold under agreements to repurchase and other borrowings: At June 30, At December 31, (Dollars in thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) : Original maturity of one year or less $ 307,124 0.11 % $ 269,330 0.13 % Original maturity of greater than one year, non-callable 200,000 1.47 200,000 0.84 Total securities sold under agreements to repurchase 507,124 0.65 469,330 0.43 Fed funds purchased — — 526,025 0.08 Securities sold under agreements to repurchase and other borrowings $ 507,124 0.65 $ 995,355 0.25 (1) The Company has right of offset with respect to all repurchase agreement assets and liabilities. Total securities sold under agreements to repurchase are presented as gross transactions, as only liabilities are outstanding for the periods presented. Repurchase agreements are used as a source of borrowed funds and are collateralized by agency mortgage-backed securities. Repurchase agreement counterparties are limited to primary dealers in government securities and commercial/municipal customers through the Corporate Treasury function. The following table provides information for FHLB advances: At June 30, 2021 At December 31, 2020 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 25,000 0.33 % $ 25,000 0.38 % After 1 but within 2 years 100 — 110 — After 2 but within 3 years 208 2.95 215 2.95 After 3 but within 4 years 100,000 1.50 50,000 1.59 After 4 but within 5 years — — 50,000 1.42 After 5 years 13,136 2.56 7,839 2.66 FHLB advances $ 138,444 1.39 $ 133,164 1.36 Aggregate carrying value of assets pledged as collateral $ 7,004,625 $ 7,387,054 Remaining borrowing capacity 4,528,972 4,689,642 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) 341,488 344,164 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total notes and subordinated debt 568,808 571,484 Discount on senior fixed-rate notes (1,084) (1,193) Debt issuance cost on senior fixed-rate notes (2,427) (2,628) Long-term debt $ 565,297 $ 567,663 (1) The Company de-designated its fair value hedging relationship on these notes. A basis adjustment is included in the carrying value, which is being amortized over the remaining life of the notes. (2) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 3.07% at June 30, 2021 and 3.18% at December 31, 2020.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income, Net of Tax	6 Months Ended
Accumulated Other Comprehensive Income, Net of Tax	Jun. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income, Net of Tax	Accumulated Other Comprehensive Income, Net of Tax The following table summarizes the changes in each component of accumulated other comprehensive income (loss), net of tax: Three months ended June 30, 2021 Six months ended June 30, 2021 (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 $ 37,071 $ 15,546 $ (44,343) $ 8,274 $ 67,424 $ 19,918 $ (45,086) $ 42,256 Other comprehensive (loss) before reclassifications (1,473) (2,475) — (3,948) (31,826) (7,645) — (39,471) Amounts reclassified from accumulated other comprehensive (loss) — 823 741 1,564 — 1,621 1,484 3,105 Net current-period other comprehensive (loss) income, net of tax (1,473) (1,652) 741 (2,384) (31,826) (6,024) 1,484 (36,366) Ending balance $ 35,598 $ 13,894 $ (43,602) $ 5,890 $ 35,598 $ 13,894 $ (43,602) $ 5,890 Three months ended June 30, 2020 Six months ended June 30, 2020 (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 $ 1,562 $ 17,048 $ (43,410) $ (24,800) $ 17,251 $ (9,184) $ (44,139) $ (36,072) Other comprehensive income before reclassifications 61,914 2,186 — 64,100 46,231 26,965 — 73,196 Amounts reclassified from accumulated other comprehensive income — 1,415 730 2,145 (6) 2,868 1,459 4,321 Net current-period other comprehensive income, net of tax 61,914 3,601 730 66,245 46,225 29,833 1,459 77,517 Ending balance $ 63,476 $ 20,649 $ (42,680) $ 41,445 $ 63,476 $ 20,649 $ (42,680) $ 41,445 The following table further details the amounts reclassified from accumulated other comprehensive income (loss): (In thousands) Three months ended June 30, Six months ended June 30, Associated Line Item on the Condensed Consolidated Statements of Income AOCI (AOCL) Component 2021 2020 2021 2020 Securities available-for-sale: Unrealized gains on investment securities $ — $ — $ — $ 8 Gain on sale of investment securities, net Tax expense — — — (2) Income tax expense Net of tax $ — $ — $ — $ 6 Derivative instruments: Hedge terminations $ (1,037) $ (1,088) $ (2,042) $ (2,261) Interest expense Premium amortization (77) (828) (153) (1,622) Interest income Tax benefit 291 501 574 1,015 Income tax expense Net of tax $ (823) $ (1,415) $ (1,621) $ (2,868) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,007) $ (990) $ (2,015) $ (1,980) Other non-interest expense Tax benefit 266 260 531 521 Income tax expense Net of tax $ (741) $ (730) $ (1,484) $ (1,459)

Regulatory Matters

Regulatory Matters	6 Months Ended
Regulatory Matters	Jun. 30, 2021
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 OCC. Regulatory authorities can initiate certain mandatory actions if either 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. Total risk-based capital is comprised of three categories as defined by Basel III capital rules: CET1 capital, Tier 1 capital, and Tier 2 capital. CET1 capital includes common shareholders' equity, less deductions for goodwill, other intangibles, and certain deferred tax adjustments. For purposes of CET1 capital, common shareholders' equity excludes AOCI (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, 2021 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,664,879 11.66 % $ 1,028,123 4.5 % $ 1,485,067 6.5 % Total risk-based capital 3,130,000 13.70 1,827,774 8.0 2,284,718 10.0 Tier 1 risk-based capital 2,809,916 12.30 1,370,831 6.0 1,827,774 8.0 Tier 1 leverage capital 2,809,916 8.53 1,317,538 4.0 1,646,923 5.0 Webster Bank CET1 risk-based capital $ 2,897,545 12.69 % $ 1,027,620 4.5 % $ 1,484,340 6.5 % Total risk-based capital 3,140,309 13.75 1,826,881 8.0 2,283,601 10.0 Tier 1 risk-based capital 2,897,545 12.69 1,370,160 6.0 1,826,881 8.0 Tier 1 leverage capital 2,897,545 8.80 1,317,166 4.0 1,646,458 5.0 At December 31, 2020 Actual Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,543,131 11.35 % $ 1,008,512 4.5 % $ 1,456,739 6.5 % Total risk-based capital 3,045,652 13.59 1,792,910 8.0 2,241,137 10.0 Tier 1 risk-based capital 2,688,168 11.99 1,344,682 6.0 1,792,910 8.0 Tier 1 leverage capital 2,688,168 8.32 1,291,980 4.0 1,614,975 5.0 Webster Bank CET1 risk-based capital $ 2,791,474 12.46 % $ 1,008,027 4.5 % $ 1,456,039 6.5 % Total risk-based capital 3,071,505 13.71 1,792,048 8.0 2,240,060 10.0 Tier 1 risk-based capital 2,791,474 12.46 1,344,036 6.0 1,792,048 8.0 Tier 1 leverage capital 2,791,474 8.65 1,291,415 4.0 1,614,268 5.0 (1) In accordance with regulatory capital rules, the Company elected an option to delay the estimated impact of the adoption of CECL on its regulatory capital over a two-year deferral period and subsequent three-year transition period ending December 31, 2024. As a result, capital ratios and amounts exclude the impact of the increased allowance for credit losses on loans, held-to-maturity debt securities, and unfunded loan commitments attributed to the adoption of CECL, adjusted for an approximation of the after-tax provision for credit losses attributable to CECL relative to the incurred loss methodology during the deferral period. 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. Dividends paid by the Bank are subject to various federal and state regulatory limitations. Express approval by the OCC is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels, or would exceed the net income for that year combined with the undistributed net income for the preceding two years. Webster Bank paid $120.0 million in dividends to Webster Financial Corporation during the six months ended June 30, 2021, whereas no dividends were paid during the six months ended June 30, 2020. Cash Restrictions. Webster Bank is required by Federal Reserve System regulations to hold cash reserve balances on hand or with a Federal Reserve Bank. To address liquidity concerns due to COVID-19, the Federal Reserve reset the requirement to zero. The reserve requirement ratio remains subject to adjustment as conditions warrant.

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
Earnings Per Common Share	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share A reconciliation of the calculation of basic and diluted earnings per common share is as follows: Three months ended June 30, Six months ended June 30, (In thousands, except per share data) 2021 2020 2021 2020 Earnings for basic and diluted earnings per common share: Net income $ 94,035 $ 53,097 $ 202,113 $ 91,296 Less: Preferred stock dividends 1,969 1,969 3,938 3,938 Net income available to common shareholders 92,066 51,128 198,175 87,358 Less: Earnings applicable to participating securities (1) 511 399 1,090 592 Earnings applicable to common shareholders $ 91,555 $ 50,729 $ 197,085 $ 86,766 Shares: Weighted-average common shares outstanding - basic 90,027 89,485 89,918 90,206 Effect of dilutive securities 194 85 246 185 Weighted-average common shares outstanding - diluted 90,221 89,570 90,164 90,391 Earnings per common share (1) : Basic $ 1.02 $ 0.57 $ 2.19 $ 0.96 Diluted 1.01 0.57 2.19 0.96 (1) Earnings per common share amounts under the two-class method for unvested time-based restricted stock with non-forfeitable dividends and dividend rights are computed the same as the presentation above. Dilutive Securities Webster 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 attributed to outstanding stock options and non-participating, performance-based restricted stock. Potential common shares from non-participating, performance-based restricted stock of 55 thousand and 192 thousand for the three months ended June 30, 2021 and 2020, respectively, and 28 thousand and 114 thousand for the six months ended June 30, 2021 and 2020, respectively, are excluded from the effect of dilutive securities because they would have been anti-dilutive under the treasury stock method.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
Derivative Financial Instruments	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Derivative Positions and Offsetting Derivatives Designated in Hedge Relationships . Interest rate swaps allow the Company to change the fixed or variable nature of an interest rate without the exchange of the underlying notional amount. Certain pay fixed/receive variable interest rate swaps are designated as cash flow hedges to effectively convert variable-rate debt into fixed-rate debt, while certain receive fixed/pay variable interest rate swaps are designated as fair value hedges to effectively convert fixed-rate long-term debt into variable-rate debt. Certain purchased options are designated as cash flow hedges. Purchased options allow the Company to limit the potential adverse impact of variable interest rates by establishing a cap or floor rate in exchange for an upfront premium. The purchased options designated as cash flow hedges represent interest rate caps where payment is received from the counterparty if interest rates rise above the cap rate, and interest rate floors where payment is received from the counterparty when interest rates fall below the floor rate. Derivatives Not Designated in Hedge Relationships. The Company also enters into other derivative transactions to manage economic risks, but does not designate the instruments in hedge relationships. Further, the Company enters into derivative contracts to accommodate customer needs. Derivative contracts with customers are offset with dealer counterparty transactions structured with matching terms to ensure minimal impact on earnings. The following table presents the notional amounts and fair values of derivative positions: At June 30, 2021 At December 31, 2020 Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives (In thousands) Notional Fair Notional Fair Notional Fair Notional Fair Designated as hedging instruments: Interest rate derivatives (1) $ 1,000,000 $ 29,179 $ 25,000 $ 14 $ 1,000,000 $ 39,641 $ 25,000 $ 103 Not designated as hedging instruments: Interest rate derivatives (1) 4,526,290 196,438 4,422,119 16,137 4,533,441 292,096 4,356,339 11,874 Mortgage banking derivatives (2) 32,078 263 1,294 2 40,771 855 — — Other (3) 108,871 354 309,867 139 108,987 264 360,497 377 Total not designated as hedging instruments 4,667,239 197,055 4,733,280 16,278 4,683,199 293,215 4,716,836 12,251 Gross derivative instruments, before netting $ 5,667,239 226,234 $ 4,758,280 16,292 $ 5,683,199 332,856 $ 4,741,836 12,354 Less: Master netting agreements 4,724 4,724 7,522 7,522 Cash collateral 30,234 2,996 33,043 4,485 Total derivative instruments, after netting $ 191,276 $ 8,572 $ 292,291 $ 347 (1) Balances related to Chicago Mercantile Exchange (CME), excluding accrued interest, are presented as a single unit of account. In accordance with its rule book, CME legally characterizes variation margin payments as settlement of derivatives rather than collateral against derivative positions. Notional amounts of interest rate swaps cleared through CME include $0.2 billion and $0.1 billion for asset derivatives and $3.0 billion and $3.2 billion for liability derivatives at June 30, 2021 and December 31, 2020, respectively. The related fair values approximate zero. (2) Notional amounts related to residential loans exclude approved floating rate commitments of $1.2 million at June 30, 2021. (3) Other derivatives include foreign currency forward contracts related to lending arrangements and customer hedging activity, a Visa equity swap transaction, and risk participation agreements. Notional amounts of risk participation agreements include $83.1 million and $80.5 million for asset derivatives and $306.8 million and $338.9 million for liability derivatives at June 30, 2021 and December 31, 2020, respectively, that have insignificant related fair values. The following table presents fair value positions transitioned from gross to net upon applying contractual counterparty netting agreements: At June 30, 2021 (In thousands) Gross Offset Amount Net Amount on Balance Sheet Amounts Not Offset Net Amounts Asset derivatives $ 34,958 $ 34,958 $ — $ 134 $ 134 Liability derivatives 7,720 7,720 — 1,915 1,915 At December 31, 2020 (In thousands) Gross Offset Amount Net Amount on Balance Sheet Amounts Not Offset Net Amounts Asset derivatives $ 40,565 $ 40,565 $ — $ 785 $ 785 Liability derivatives 12,007 12,007 — 1,247 1,247 Derivative Activity The following table presents the income statement effect of derivatives designated as cash flow hedges: Recognized In Three months ended June 30, Six months ended June 30, (In thousands) Net Interest Income 2021 2020 2021 2020 Interest rate derivatives Long-term debt $ 123 $ 1,228 $ 244 $ 2,349 Interest rate derivatives Interest and fees on loans and leases (2,645) (1,837) (5,227) (1,097) Net recognized on cash flow hedges $ (2,522) $ (609) $ (4,983) $ 1,252 The following table presents information related to a fair value hedging adjustment: Condensed Consolidated Balance Sheet Line Item in Which Hedged Item is Located Carrying Amount of Previously Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount (In thousands) At June 30, At December 31, At June 30, At December 31, Long-term debt $ 341,488 $ 344,164 $ 41,488 $ 44,164 The following table presents the effect on the income statement for derivatives not designated as hedging instruments: Recognized In Three months ended June 30, Six months ended June 30, (In thousands) Non-interest Income 2021 2020 2021 2020 Interest rate derivatives Other income $ (239) $ (2,523) $ 4,405 $ 3,403 Mortgage banking derivatives Mortgage banking activities (212) 633 (594) 1,626 Other Other income (303) (1,014) 169 897 Total not designated as hedging instruments $ (754) $ (2,904) $ 3,980 $ 5,926 Purchased options designated as cash flow hedges exclude time-value premiums from the assessment of hedge effectiveness. Time-value premiums are amortized on a straight-line basis. At June 30, 2021, the remaining unamortized balance of time-value premiums was $8.6 million. Over the next twelve months, an estimated $10.5 million decrease to interest expense will be reclassified from AOCI (AOCL) relating to cash flow hedges, and an estimated $0.3 million increase to interest expense will be reclassified from AOCI (AOCL) relating to hedge terminations. At June 30, 2021, the remaining unamortized loss on terminated cash flow hedges is $0.8 million. The maximum length of time over which forecasted transactions are hedged is 3.1 years. Additional information about cash flow hedge activity impacting AOCI (AOCL) and the related amounts reclassified to interest expense is provided in Note 11: Accumulated Other Comprehensive Income, Net of Tax. Information about the valuation methods used to measure the fair value of derivatives is provided in Note 15: Fair Value Measurements. Derivative Exposure At June 30, 2021, the Company had $72.7 million in initial margin collateral posted at CME. In addition, $32.2 million of cash collateral received is included in cash and due from banks on the accompanying Condensed Consolidated Balance Sheets. Webster 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. Current net credit exposure relating to interest rate derivatives with Webster Bank customers was $191.0 million at June 30, 2021. 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 $36.0 million at June 30, 2021. The Company incorporates a credit valuation adjustment (CVA) and debit valuation adjustment (DVA) to reflect nonperformance risk in the fair value measurement of its derivatives. Various factors impact changes in the CVA and DVA over time, including changes in the credit spreads of the parties to the contracts, as well as changes in market rates and volatilities, which affect the total expected exposure of the derivative instruments.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2021
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, rate volatility, prepayment speeds, credit ratings,) or inputs that are derived principally or corroborated by market data, 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 fair value 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 value is validated against valuations performed by independent third parties and are classified within Level 2 of the fair value hierarchy. 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." 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. 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 compares the fair value to unpaid principal balance of assets accounted for under the fair value option: At June 30, 2021 At December 31, 2020 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 4,335 $ 4,845 $ (510) $ 14,000 $ 13,511 $ 489 Investments Held in Rabbi Trust. Investments held in the Rabbi Trust primarily include open-ended 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. The Company 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 $1.6 million at June 30, 2021. Alternative Investments. Equity investments have a readily determinable fair value when quoted prices are available in an active market. Accordingly, such alternative investments are classified 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) practical expedient 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, 2021, these alternative investments had a remaining unfunded commitment of $17.6 million. A summary of the financial assets and liabilities measured at fair value on a recurring basis is as follows: At June 30, 2021 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: Agency CMO $ — $ 120,328 $ — $ 120,328 Agency MBS — 1,382,530 — 1,382,530 Agency CMBS — 941,397 — 941,397 CMBS — 754,970 — 754,970 CLO — 49,964 — 49,964 Corporate debt — 13,704 — 13,704 Total available-for-sale investment securities — 3,262,893 — 3,262,893 Gross derivative instruments, before netting (1) 317 225,917 — 226,234 Originated loans held for sale — 4,335 — 4,335 Investments held in Rabbi Trust 3,617 — — 3,617 Alternative investments (2) — — — 18,002 Total financial assets held at fair value $ 3,934 $ 3,493,145 $ — $ 3,515,081 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 51 $ 16,241 $ — $ 16,292 At December 31, 2020 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: Agency CMO $ — $ 154,613 $ — $ 154,613 Agency MBS — 1,457,409 — 1,457,409 Agency CMBS — 1,117,233 — 1,117,233 CMBS — 508,018 — 508,018 CLO — 76,383 — 76,383 Corporate debt — 13,120 — 13,120 Total available-for-sale investment securities — 3,326,776 — 3,326,776 Gross derivative instruments, before netting (1) 205 332,651 — 332,856 Originated loans held for sale — 14,000 — 14,000 Investments held in Rabbi Trust 4,811 — — 4,811 Alternative investments (2) — — — 11,112 Total financial assets held at fair value $ 5,016 $ 3,673,427 $ — $ 3,689,555 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 218 $ 12,136 $ — $ 12,354 (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, refer to Note 14: Derivative Financial Instruments. (2) Alternative investments are recorded at NAV. Assets measured at NAV are not classified within the fair value hierarchy. 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, 2021, 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 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 $19.9 million at June 30, 2021, which is inclusive of $0.4 million and $0.2 million measured at fair value where there was a $0.1 million write-up due to an observable price change and a $0.3 million write-down due to impairment, respectively. No other adjustments were identified during the six months ended June 30, 2021. Collateral Dependent Loans and Leases. Loans and leases for which the payment 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, less estimated cost to sell, using customized discounting criteria. Accordingly, such collateral dependent loans and leases are classified within Level 3 of the fair value hierarchy. Other Real Estate Owned (OREO) and Repossessed Assets. The total book value of OREO and repossessed assets was $2.8 million at June 30, 2021. 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 recorded 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. In addition, the amortized cost of consumer loans secured by residential real estate property that are in process of foreclosure amounted to $9.9 million at June 30, 2021. Fair Value of Financial Instruments and Servicing Assets The Company is required to disclose the estimated fair value of financial instruments for which it is practicable to estimate fair value, as well as for servicing assets. The following is a description of the 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 based on 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 collateral dependent 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 equal to the carrying value. Fair value for all other balances are estimated using a 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 flows 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 initially recorded at fair value and subsequently measured under the amortization method. 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 related servicing revenue stream. Mortgage servicing assets are reviewed quarterly and held at the lower of the carrying amount or fair value. Fair value adjustments, if any, are included as a component of loan related fees in the accompanying Condensed Consolidated Statements of Income. Mortgage servicing assets are classified within Level 3 of the fair value hierarchy. The carrying amounts, estimated fair values, and classifications within the fair value hierarchy of selected financial instruments and servicing assets are summarized as follows: At June 30, 2021 At December 31, 2020 (In thousands) Carrying Fair Carrying Fair Assets: Level 2 Held-to-maturity investment securities, net $ 5,623,243 $ 5,794,155 $ 5,567,889 $ 5,835,364 Level 3 Loans and leases, net 21,167,056 21,242,694 21,281,784 21,413,397 Mortgage servicing assets 11,501 16,578 13,422 14,362 Liabilities: Level 2 Deposit liabilities $ 26,832,422 $ 26,832,422 $ 24,847,618 $ 24,847,618 Time deposits 2,014,544 2,016,468 2,487,818 2,494,601 Securities sold under agreements to repurchase and other borrowings 507,124 513,384 995,355 1,000,189 FHLB advances 138,444 142,736 133,164 139,035 Long-term debt (1) 565,297 523,139 567,663 538,407 (1) Adjustments to the carrying amount of long-term debt for basis adjustment and unamortized discount and debt issuance cost on senior fixed-rate notes are not included in the determination of fair value. Refer to Note 10: Borrowings for additional information.

Retirement Benefit Plans

Retirement Benefit Plans	6 Months Ended
Retirement Benefit Plans	Jun. 30, 2021
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 (income) cost: Three months ended June 30, 2021 2020 (In thousands) Pension Plan SERP Other Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 1,166 $ 6 $ 4 $ 1,675 $ 12 $ 12 Expected return on plan assets (3,596) — — (3,380) — — Recognized net loss (gain) 1,020 9 (20) 993 6 (8) Net periodic benefit (income) cost $ (1,410) $ 15 $ (16) $ (712) $ 18 $ 4 Six months ended June 30, 2021 2020 (In thousands) Pension Plan SERP Other Benefits Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 2,332 $ 13 $ 8 $ 3,350 $ 23 $ 25 Expected return on plan assets (7,191) — — (6,760) — — Recognized net loss (gain) 2,039 17 (40) 1,985 12 (17) Net periodic benefit (income) cost $ (2,820) $ 30 $ (32) $ (1,425) $ 35 $ 8 The components of net periodic benefit (income) cost are included within other non-interest expense on the accompanying Condensed Consolidated Statements of Income. The weighted-average expected long-term rate of return on plan assets for the three and six months ended June 30, 2021 was 5.50%, as determined at the beginning of the fiscal year.

Segment Reporting

Segment Reporting	6 Months Ended
Segment Reporting	Jun. 30, 2021
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 Retail Banking. These segments reflect how executive management responsibilities are assigned, how discrete financial information is evaluated, the type of customer served, and how products and services are provided. Certain Treasury activities, along with the amounts required to reconcile profitability metrics to those reported in accordance with GAAP, are included in the Corporate and Reconciling category. Effective January 1, 2021, management realigned certain of the Company's business banking and investment services operations to better serve its customers and deliver operational efficiencies. The previously reported Community Banking segment was also renamed as Retail Banking. Under this realignment, $131.0 million of goodwill was reallocated, on a relative fair value basis, from Retail Banking to Commercial Banking. There was no goodwill impairment as a result of the reorganization. Prior period amounts have been recasted to reflect the realignment. Description of Segment Reporting Methodology Webster uses an internal profitability reporting system to generate information by reportable segment, which is based on a series of management estimates for funds transfer pricing, and allocations for non-interest expense, provision for credit losses, 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 results of any reportable 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 reportable 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, through an internal matched maturity Funds Transfer Pricing (FTP) process. The goal of the FTP allocation is to encourage loan and deposit growth consistent with the Company’s overall profitability objectives. The FTP process considers the specific interest rate risk and liquidity risk of financial instruments and other assets and liabilities in each line of business. Loans are assigned an FTP rate for funds used and deposits are assigned an FTP rate for funds provided. The allocation 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. The FTP process transfers the corporate interest rate risk exposure to the treasury function included within the Corporate and Reconciling category where such exposures are centrally managed. 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. Business development costs are generally included in the Corporate and Reconciling category. The results of funds transfer pricing and allocations for non-interest expense, as well as non-interest income produces pre-tax, pre-provision net revenue, under which basis the segments are reviewed by executive management. Webster also allocates the provision for credit losses to each reportable segment based on management's estimate of the inherent loss content in each of the specific loan and lease portfolios. Allowance for credit losses on loans and leases is included in total assets within the Corporate and Reconciling category. The following table presents balance sheet information, including all appropriate allocations, for Webster's reportable segments and the Corporate and Reconciling category: At June 30, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Goodwill $ 131,000 $ 21,813 $ 385,560 $ — $ 538,373 Total assets $ 14,837,710 $ 78,054 $ 7,432,340 $ 11,405,648 $ 33,753,752 At December 31, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Goodwill $ 131,000 $ 21,813 $ 385,560 $ — $ 538,373 Total assets $ 14,732,792 $ 80,352 $ 7,726,287 $ 10,051,259 $ 32,590,690 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, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 141,124 $ 42,193 $ 92,540 $ (55,005) $ 220,852 Non-interest income 25,713 26,554 16,763 3,672 72,702 Non-interest expense 61,445 32,792 72,346 20,445 187,028 Pre-tax, pre-provision net revenue 105,392 35,955 36,957 (71,778) 106,526 Provision for credit losses (23,328) — 1,754 74 (21,500) Income before income tax expense 128,720 35,955 35,203 (71,852) 128,026 Income tax expense 32,566 9,600 7,745 (15,920) 33,991 Net income $ 96,154 $ 26,355 $ 27,458 $ (55,932) $ 94,035 Three months ended June 30, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 128,123 $ 39,334 $ 81,609 $ (24,659) $ 224,407 Non-interest income 21,849 23,103 16,281 (1,157) 60,076 Non-interest expense 61,261 34,020 77,119 4,184 176,584 Pre-tax, pre-provision net revenue 88,711 28,417 20,771 (30,000) 107,899 Provision for credit losses 43,569 — (3,566) (3) 40,000 Income before income tax expense 45,142 28,417 24,337 (29,997) 67,899 Income tax expense 11,015 7,587 5,305 (9,105) 14,802 Net income $ 34,127 $ 20,830 $ 19,032 $ (20,892) $ 53,097 Six months ended June 30, 2021 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Net interest income $ 283,162 $ 84,302 $ 181,353 $ (104,201) $ 444,616 Non-interest income 50,890 53,559 32,834 12,176 149,459 Non-interest expense 126,281 69,042 148,470 31,217 $ 375,010 Pre-tax, pre-provision net revenue 207,771 $ 68,819 65,717 (123,242) 219,065 Provision for credit losses (42,701) — (4,632) 83 (47,250) Income before income tax expense 250,472 68,819 70,349 (123,325) 266,315 Income tax expense 63,369 18,375 15,477 (33,019) 64,202 Net income $ 187,103 $ 50,444 $ 54,872 $ (90,306) $ 202,113 Six months ended June 30, 2020 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Net interest income $ 245,710 $ 82,007 $ 162,808 $ (35,317) $ 455,208 Non-interest income 44,265 49,486 34,724 4,979 133,454 Non-interest expense 126,482 71,098 157,409 431 355,420 Pre-tax, pre-provision net revenue 163,493 60,395 40,123 (30,769) 233,242 Provision for credit losses 112,587 — 3,501 (88) 116,000 Income before income tax expense 50,906 60,395 36,622 (30,681) 117,242 Income tax expense 12,421 16,125 7,983 (10,583) 25,946 Net income $ 38,485 $ 44,270 $ 28,639 $ (20,098) $ 91,296

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
Revenue from Contracts with Customers	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers The following table presents revenues within the scope of ASC Topic 606, Revenue from Contracts with Customers, along with the net amount of other sources of non-interest income that are within the scope of other GAAP topics, by reportable segment: Three months ended June 30, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 4,104 $ 24,478 $ 12,734 $ 123 $ 41,439 Wealth and investment services 10,096 — — (9) 10,087 Other 276 2,076 303 — 2,655 Revenue from contracts with customers 14,476 26,554 13,037 114 54,181 Other sources of non-interest income 11,237 — 3,726 3,558 18,521 Total non-interest income $ 25,713 $ 26,554 $ 16,763 $ 3,672 $ 72,702 Three months ended June 30, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 3,443 $ 21,741 $ 10,748 $ (93) $ 35,839 Wealth and investment services 7,140 — — (38) 7,102 Other 363 1,362 377 — 2,102 Revenue from contracts with customers 10,946 23,103 11,125 (131) 45,043 Other sources of non-interest income 10,903 — 5,156 (1,026) 15,033 Total non-interest income $ 21,849 $ 23,103 $ 16,281 $ (1,157) $ 60,076 Six months ended June 30, 2021 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 8,205 $ 49,496 $ 24,037 $ 170 $ 81,908 Wealth and investment services 19,508 — — (18) 19,490 Other 578 4,063 549 — 5,190 Revenue from contracts with customers 28,291 53,559 24,586 152 106,588 Other sources of non-interest income 22,599 — 8,248 12,024 42,871 Total non-interest income $ 50,890 $ 53,559 $ 32,834 $ 12,176 $ 149,459 Six months ended June 30, 2020 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 7,354 $ 46,583 $ 24,488 $ (16) $ 78,409 Wealth and investment services 15,886 — — (45) 15,841 Other 619 2,903 438 — 3,960 Revenue from contracts with customers 23,859 49,486 24,926 (61) 98,210 Other sources of non-interest income 20,406 — 9,798 5,040 35,244 Total non-interest income $ 44,265 $ 49,486 $ 34,724 $ 4,979 $ 133,454 The major sources of revenue from contracts with customers 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 are satisfied monthly. Interchange fees are assessed as the performance obligation is satisfied, which is the point in time that 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, but certain obligations may be satisfied at points in time for activities that are transactional in nature. These disaggregated amounts are reconciled to non-interest income as presented within Note 17: Segment Reporting. Contracts with customers did not generate significant contract assets and liabilities.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Credit-Related Financial Instruments The Company offers credit-related financial instruments in the normal course of business to meet certain financing needs of its customers, that involve off-balance sheet risk. These transactions may include an unused commitment to extend credit, standby letter of credit, or a 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 Letters 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 Letters 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, 2020 Commitments to extend credit $ 7,143,906 $ 6,517,840 Standby letters of credit 213,751 207,201 Commercial letters of credit 50,120 30,522 Total credit-related financial instruments with off-balance sheet risk $ 7,407,777 $ 6,755,563 These commitments subject the Company to potential exposure in excess of amounts recorded in the financial statements, and therefore, management maintains an allowance for credit losses on unfunded loan commitments to provide for expected losses in connection with funding the unused portion of legal commitments to lend when those commitments are not unconditionally cancellable by Webster. Loss calculation factors are consistent with the ACL methodology for funded loans using PD and LGD applied to the underlying borrower risk and facility grades, a draw down factor applied to utilization rates, and relevant forecast information. This allowance is reported as a component of accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets. The following table provides a summary of activity in the allowance for credit losses on unfunded loan commitments: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Beginning balance $ 12,800 $ 10,084 $ 12,755 $ 2,367 Adoption of ASU No. 2016-13 (CECL) — — — 9,139 (Benefit) provision (826) 655 (781) (767) Ending balance $ 11,974 $ 10,739 $ 11,974 $ 10,739

Subsequent Events

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated subsequent events from the date of the Condensed Consolidated Financial Statements and accompanying Notes thereto, June 30, 2021, through the date of issuance, and determined that no significant events were identified requiring recognition or disclosure.

Business Developments

Business Developments	6 Months Ended
Business Developments	Jun. 30, 2021
Business Combination and Restructuring and Related Activities [Abstract]
Business Developments	Business Developments Pending Merger On April 19, 2021, Webster and Sterling announced that their boards of directors approved by unanimous vote a definitive agreement under which the two companies will combine in an all-stock transaction. Under the terms of the agreement, Sterling will merge into Webster, and Sterling's shareholders will receive a fixed exchange ratio of 0.463 of a Webster common share for each share of Sterling common stock owned. In addition, at the effective time of the merger, each outstanding share of Sterling's Series A non-cumulative perpetual preferred stock will be converted into the right to receive a newly created series of Webster preferred stock having substantially the same terms. The merger is expected to close in the fourth quarter of 2021, subject to the satisfaction of customary closing conditions, including receipt of required regulatory approvals and approval by the shareholders of Webster and Sterling. In connection with the proposed transaction, the Company incurred $17.1 million of merger-related expenses during the three months ended June 30, 2021, primarily consisting of professional fees for investment banking, legal, accounting, and employee retention costs. Merger-related expenses are recorded as either professional and outside services, compensation and benefits, or other non-interest expense on the accompanying Condensed Consolidated Statements of Income, and are presented in the Corporate and Reconciling category for segment reporting purposes. Strategic Initiatives During the fourth quarter of 2020, the Company launched a strategic plan to drive incremental revenue and cost savings measures across the organization through the consolidation of banking centers and corporate facilities, process automation, ancillary spend reduction, and other organizational actions. The following table presents the changes in reserves associated with the Company's strategic initiatives for the three and six months ended June 30, 2021: Three months ended June 30, 2021 (In thousands) Severance ROU Asset Other Total Beginning balance $ 18,370 $ — $ 4,545 $ 22,915 Charged to earnings 45 30 1,063 1,138 Charged against assets — (30) (332) (362) Cash payments (4,451) — (3,046) (7,497) Ending balance $ 13,964 $ — $ 2,230 $ 16,194 Six months ended June 30, 2021 Severance ROU Asset Other Total Beginning balance $ 17,675 $ — $ 2,120 $ 19,795 Charged to earnings 2,105 209 8,265 10,579 Charged against assets — (209) (1,966) (2,175) Cash payments (5,816) — (6,189) (12,005) Ending balance $ 13,964 $ — $ 2,230 $ 16,194 The reserves associated with strategic initiatives are included in accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets. Severance costs are recorded as compensation and benefits, Right-of-Use (ROU) lease asset charges are recorded as occupancy expense, and Other is recorded as either occupancy, technology and equipment, professional and outside services, or other non-interest expense on the accompanying Condensed Consolidated Statements of Income. Strategic initiative costs are presented in the Corporate and Reconciling category for segment reporting purposes.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with GAAP for interim financial information and 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 thereto, for the year ended December 31, 2020, included in our Form 10-K filed with the SEC. In the opinion of management, all necessary adjustments are reflected to present fairly the financial position and results of operations as of the dates and for the periods shown. Operating results for the three and six months ended June 30, 2021 are not necessarily indicative of results that may be attained during the full year ending December 31, 2021, or any future period. There have been no changes to the Company's significant accounting policies from those described within that Form 10-K, except as described within the Recently Adopted Accounting Standards Updates section of this note.
Use of Estimates	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 and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Recently Adopted Accounting Standards Updates	Recently Adopted Accounting Standards Updates ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The Accounting Standards Update (the Update) provides simplification to the accounting for income taxes related to a variety of topics and makes minor codification improvements. Changes include a requirement that the effects of an enacted change in tax law be reflected in the computation of the annual effective tax rate in the first interim period that includes the enactment date of the new legislation and clarification on presentation of non-income based taxes. The Company adopted the Update on January 1, 2021 on a prospective basis. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. ASU No. 2021-01, Reference Rate Reform (Topic 848) - Scope. The Update clarifies that certain optional expedients and exceptions provided for in ASU No. 2020-04 for applying GAAP to contract modifications and hedging relationships apply to derivatives that are affected by the discounting transition. The amendments are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. The Update was effective upon issuance for application on either a retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 22, 2020, or on a prospective basis beginning on January 7, 2021. The Company adopted the Update on a prospective basis. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. Accounting Standards Issued But Not Yet Adopted The Company has adopted all applicable Accounting Standards Updates issued by the Financial Accounting Standards Board (FASB) as of June 30, 2021.

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
Investment Securities (Tables)	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Held-to-maturity	A summary of the amortized cost, fair value, and allowance for credit losses on investment securities held-to-maturity is presented below: At June 30, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 61,080 $ 1,425 $ (63) $ 62,442 $ — $ 61,080 Agency MBS 2,562,863 96,187 (3,684) 2,655,366 — 2,562,863 Agency CMBS 2,105,924 30,491 (16,545) 2,119,870 — 2,105,924 Municipal bonds and notes 715,195 56,218 — 771,413 382 714,813 CMBS 178,563 6,501 — 185,064 — 178,563 Held-to-maturity securities $ 5,623,625 $ 190,822 $ (20,292) $ 5,794,155 $ 382 $ 5,623,243 At December 31, 2020 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 91,622 $ 1,785 $ (241) $ 93,166 $ — $ 91,622 Agency MBS 2,419,751 137,863 (84) 2,557,530 — 2,419,751 Agency CMBS 2,101,227 60,484 (2,213) 2,159,498 — 2,101,227 Municipal bonds and notes 739,507 60,371 (3) 799,875 299 739,208 CMBS 216,081 9,214 — 225,295 — 216,081 Held-to-maturity securities $ 5,568,188 $ 269,717 $ (2,541) $ 5,835,364 $ 299 $ 5,567,889 (1) Amortized cost excludes accrued interest receivable of $20.9 million and $22.1 million at June 30, 2021 and December 31, 2020, respectively, which is included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. The following table summarizes the activity in the allowance for credit losses on investment securities held-to-maturity: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Balance beginning of period $ 308 $ 312 $ 299 $ — Adoption of ASU No. 2016-13 (CECL) — — — 397 Provision (benefit) for credit losses 74 (3) 83 (88) Balance end of period $ 382 $ 309 $ 382 $ 309 The following table summarizes credit ratings for the amortized cost of held-to-maturity debt securities according to their lowest public credit rating at June 30, 2021: Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Baa2 Not Rated Agency CMOs $ — $ 61,080 $ — $ — $ — $ — $ — $ — $ — Agency MBS — 2,562,863 — — — — — — — Agency CMBS — 2,105,924 — — — — — — — Municipal bonds and notes 208,615 120,173 227,856 108,619 36,087 8,468 2,066 190 3,121 CMBS 178,563 — — — — — — — — Total held-to-maturity $ 387,178 $ 4,850,040 $ 227,856 $ 108,619 $ 36,087 $ 8,468 $ 2,066 $ 190 $ 3,121 The amortized cost and fair value of held-to-maturity debt securities presented by contractual maturity are set forth below: At June 30, 2021 (In thousands) Amortized Fair Due in one year or less $ 380 $ 384 Due after one year through five years 4,843 5,163 Due after five years through ten years 285,191 298,449 Due after ten years 5,333,211 5,490,159 Total held-to-maturity debt securities $ 5,623,625 $ 5,794,155
Debt Securities, Available-for-sale	A summary of the amortized cost and fair value of available-for-sale securities is presented below: At June 30, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value (2) Agency CMO $ 115,985 $ 4,366 $ (23) $ 120,328 Agency MBS 1,339,769 47,666 (4,905) 1,382,530 Agency CMBS 939,055 10,509 (8,167) 941,397 CMBS 754,192 1,008 (230) 754,970 CLO 50,000 8 (44) 49,964 Corporate debt 14,569 11 (876) 13,704 Available-for-sale securities $ 3,213,570 $ 63,568 $ (14,245) $ 3,262,893 At December 31, 2020 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value (2) Agency CMO $ 148,711 $ 6,000 $ (98) $ 154,613 Agency MBS 1,389,100 68,598 (289) 1,457,409 Agency CMBS 1,092,430 26,317 (1,514) 1,117,233 CMBS 512,759 1,082 (5,823) 508,018 CLO 76,693 — (310) 76,383 Corporate debt 14,557 — (1,437) 13,120 Available-for-sale securities $ 3,234,250 $ 101,997 $ (9,471) $ 3,326,776 (1) Amortized cost excludes accrued interest receivable of $6.7 million and $7.5 million at June 30, 2021 and December 31, 2020, respectively, which is included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. (2) Fair value represents net carrying value as there is no allowance for credit losses recorded on investment securities available-for-sale, as the securities are high credit quality and investment grade. The following table provides information on fair value and unrealized losses for the individual available-for-sale securities with an unrealized loss, for which an allowance for credit losses on investment securities available-for-sale has not been recorded, aggregated by classification and length of time that the individual investment securities have been in a continuous unrealized loss position: At June 30, 2021 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized # of Fair Unrealized Agency CMO $ 3,879 $ (8) $ 2,580 $ (15) 3 $ 6,459 $ (23) Agency MBS 224,986 (4,687) 15,482 (218) 46 240,468 (4,905) Agency CMBS 421,812 (8,167) — — 11 421,812 (8,167) CMBS 285,792 (125) 117,796 (105) 29 403,588 (230) CLO — — 24,956 (44) 1 24,956 (44) Corporate debt — — 9,422 (876) 2 9,422 (876) Available-for-sale in unrealized loss position $ 936,469 $ (12,987) $ 170,236 $ (1,258) 92 $ 1,106,705 $ (14,245) At December 31, 2020 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized # of Fair Unrealized Agency CMO $ 13,137 $ (49) $ 5,944 $ (49) 5 $ 19,081 $ (98) Agency MBS 33,742 (219) 4,561 (70) 30 38,303 (289) Agency CMBS 376,330 (1,514) — — 8 376,330 (1,514) CMBS 409,591 (5,486) 23,167 (337) 38 432,758 (5,823) CLO 57,728 (265) 18,655 (45) 4 76,383 (310) Corporate debt 4,100 (166) 9,020 (1,271) 3 13,120 (1,437) Available-for-sale in unrealized loss position $ 894,628 $ (7,699) $ 61,347 $ (1,772) 88 $ 955,975 $ (9,471) The amortized cost and fair value of available-for-sale debt securities presented by contractual maturity are set forth below: At June 30, 2021 (In thousands) Amortized Fair Due in one year or less $ — $ — Due after one year through five years 2,614 2,703 Due after five through ten years 183,925 184,105 Due after ten years 3,027,031 3,076,085 Total available-for-sale debt securities $ 3,213,570 $ 3,262,893

Loans and Leases (Tables)

Loans and Leases (Tables)	6 Months Ended
Loans and Leases (Tables)	Jun. 30, 2021
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, 2020 Commercial non-mortgage $ 6,843,415 $ 7,085,076 Asset-based 943,961 890,598 Commercial real estate 6,410,672 6,322,637 Equipment financing 630,343 602,224 Commercial portfolio 14,828,391 14,900,535 Residential 4,856,302 4,782,016 Home equity 1,677,136 1,802,865 Other consumer 113,172 155,799 Consumer portfolio 6,646,610 6,740,680 Loans and leases (1) (2) (3) $ 21,475,001 $ 21,641,215 (1) Loan balances include net deferred (fees)/costs and net (premiums)/discounts of $(13.5) million and $(10.5) million at June 30, 2021 and December 31, 2020, respectively. (2) At June 30, 2021, the Company had pledged $7.3 billion of eligible loans as collateral to support borrowing capacity at the FHLB of Boston and the FRB of Boston. (3) Loan balances exclude accrued interest receivable of $54.6 million and $57.8 million at June 30, 2021 and December 31, 2020, respectively, which is included in accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets.
Past Due Financing Receivables	The following table summarizes the aging of loans and leases: At June 30, 2021 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans Commercial non-mortgage $ 1,017 $ 127 $ 25 $ 49,513 $ 50,682 $ 6,792,733 $ 6,843,415 Asset-based — — — 2,375 2,375 941,586 943,961 Commercial real estate 1,324 364 — 12,695 14,383 6,396,289 6,410,672 Equipment financing 1,578 438 — 8,162 10,178 620,165 630,343 Commercial portfolio 3,919 929 25 72,745 77,618 14,750,773 14,828,391 Residential 3,891 805 — 21,472 26,168 4,830,134 4,856,302 Home equity 5,429 2,604 — 25,975 34,008 1,643,128 1,677,136 Other consumer 479 336 — 412 1,227 111,945 113,172 Consumer portfolio 9,799 3,745 — 47,859 61,403 6,585,207 6,646,610 Total $ 13,718 $ 4,674 $ 25 $ 120,604 $ 139,021 $ 21,335,980 $ 21,475,001 At December 31, 2020 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans Commercial non-mortgage $ 612 $ 903 $ 445 $ 64,073 $ 66,033 $ 7,019,043 $ 7,085,076 Asset-based 1,174 — — 2,594 3,768 886,830 890,598 Commercial real estate 2,400 619 — 21,231 24,250 6,298,387 6,322,637 Equipment financing 5,107 2,308 — 7,299 14,714 587,510 602,224 Commercial portfolio 9,293 3,830 445 95,197 108,765 14,791,770 14,900,535 Residential 4,334 6,330 — 41,081 51,745 4,730,271 4,782,016 Home equity 5,500 1,771 — 31,030 38,301 1,764,564 1,802,865 Other consumer 878 601 — 652 2,131 153,668 155,799 Consumer portfolio 10,712 8,702 — 72,763 92,177 6,648,503 6,740,680 Total $ 20,005 $ 12,532 $ 445 $ 167,960 $ 200,942 $ 21,440,273 $ 21,641,215
Financing Receivable, Nonaccrual	The following table provides additional detail related to loans and leases on non-accrual status: At June 30, 2021 At December 31, 2020 (In thousands) Non-accrual Non-accrual With No Allowance Non-accrual Non-accrual With No Allowance Commercial non-mortgage $ 49,513 $ 8,386 $ 64,073 $ 16,985 Asset-based 2,375 2,375 2,594 — Commercial real estate 12,695 554 21,231 15,529 Equipment financing 8,162 2,538 7,299 2,983 Commercial portfolio 72,745 13,853 95,197 35,497 Residential 21,472 12,680 41,081 29,843 Home equity 25,975 20,620 31,030 24,091 Other consumer 412 6 652 2 Consumer portfolio 47,859 33,306 72,763 53,936 Total $ 120,604 $ 47,159 $ 167,960 $ 89,433
Activity In Allowance For Losses	The following table summarizes the activity in, as well as the loan and lease balances that were evaluated for, ACL on loans and leases: At or for the three months ended June 30, 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 283,906 $ 44,445 $ 328,351 $ 261,926 $ 73,005 $ 334,931 (Benefit) provision (21,077) (497) (21,574) 44,605 (4,602) 40,003 Charge-offs (594) (2,808) (3,402) (15,294) (2,780) (18,074) Recoveries 836 3,734 4,570 283 1,379 1,662 Balance, end of period $ 263,071 $ 44,874 $ 307,945 $ 291,520 $ 67,002 $ 358,522 At or for the six months ended June 30, 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 312,244 $ 47,187 $ 359,431 $ 161,669 $ 47,427 $ 209,096 Adoption of ASU No. 2016-13 (CECL) — — — 34,024 23,544 57,568 (Benefit) provision (44,730) (2,603) (47,333) 115,848 240 116,088 Charge-offs (6,915) (5,782) (12,697) (20,868) (7,367) (28,235) Recoveries 2,472 6,072 8,544 847 3,158 4,005 Balance, end of period $ 263,071 $ 44,874 $ 307,945 $ 291,520 $ 67,002 $ 358,522 Individually evaluated for impairment 11,537 4,560 16,097 15,271 4,484 19,755 Collectively evaluated for impairment $ 251,534 $ 40,314 $ 291,848 $ 276,249 $ 62,518 $ 338,767 Loan and lease balances: Individually evaluated for impairment $ 128,937 $ 110,521 $ 239,458 $ 165,010 $ 158,146 $ 323,156 Collectively evaluated for impairment 14,699,454 6,536,089 21,235,543 14,589,073 6,890,288 21,479,361 Loans and leases $ 14,828,391 $ 6,646,610 $ 21,475,001 $ 14,754,083 $ 7,048,434 $ 21,802,517 The following table provides a summary of activity in the allowance for credit losses on unfunded loan commitments: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Beginning balance $ 12,800 $ 10,084 $ 12,755 $ 2,367 Adoption of ASU No. 2016-13 (CECL) — — — 9,139 (Benefit) provision (826) 655 (781) (767) Ending balance $ 11,974 $ 10,739 $ 11,974 $ 10,739
Impaired Loans	The following table summarizes individually assessed loans and leases: At June 30, 2021 (In thousands) Unpaid Amortized Cost Amortized Cost No Allowance Amortized Cost With Allowance Related Commercial non-mortgage $ 122,891 $ 97,270 $ 43,936 $ 53,334 $ 8,488 Asset-based 2,499 2,375 2,375 — — Commercial real estate 24,581 21,130 7,329 13,801 1,808 Equipment financing 8,621 8,162 2,538 5,624 1,241 Residential 72,749 68,823 36,092 32,731 2,770 Home equity 46,364 41,286 30,162 11,124 1,668 Other consumer 412 412 6 406 122 Total $ 278,117 $ 239,458 $ 122,438 $ 117,020 $ 16,097 At December 31, 2020 (In thousands) Unpaid Amortized Cost Amortized Cost No Allowance Amortized Cost With Allowance Related Commercial non-mortgage $ 172,069 $ 119,884 $ 55,742 $ 64,142 $ 9,665 Asset-based 2,989 2,594 — 2,594 50 Commercial real estate 37,177 33,879 25,931 7,948 1,610 Equipment financing 7,770 7,298 2,983 4,315 362 Residential 108,077 98,164 58,915 39,249 3,357 Home equity 109,156 46,950 34,335 12,615 988 Other consumer 2,381 653 2 651 105 Total $ 439,619 $ 309,422 $ 177,908 $ 131,514 $ 16,137 The following table summarizes average amortized cost and interest income recognized for individually assessed loans and leases: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 (In thousands) Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Commercial non-mortgage $ 105,811 $ 682 $ — $ 136,483 $ 875 $ — $ 108,577 $ 1,541 $ — $ 115,903 $ 1,928 $ — Asset-based 2,389 — — 138 — — 2,485 — — 139 — — Commercial real estate 23,721 126 — 26,017 169 — 27,505 308 — 25,411 315 — Equipment financing 7,121 — — 8,373 — — 7,730 — — 6,613 — — Residential 80,670 577 168 121,488 781 230 83,494 1,216 441 113,806 1,611 860 Home equity 44,120 287 302 50,573 309 413 44,118 509 516 43,863 700 1,243 Other consumer 504 — — 1,121 — — 533 — — 609 17 — Total $ 264,336 $ 1,672 $ 470 $ 344,193 $ 2,134 $ 643 $ 274,442 $ 3,574 $ 957 $ 306,344 $ 4,571 $ 2,103 The following table summarizes whether, or not, individually assessed loans and leases are collateral dependent: At June 30, 2021 At December 31, 2020 (In thousands) Collateral Dependent Not Considered Collateral Dependent Total Collateral Dependent Not Considered Collateral Dependent Total Commercial non-mortgage $ 18,496 $ 78,774 $ 97,270 $ 11,074 $ 108,810 $ 119,884 Asset-based 2,375 — 2,375 2,504 90 2,594 Commercial real estate 17,598 3,532 21,130 28,482 5,397 33,879 Equipment financing — 8,162 8,162 — 7,298 7,298 Residential 17,649 51,174 68,823 33,980 64,184 98,164 Home equity 22,494 18,792 41,286 26,796 20,154 46,950 Other consumer — 412 412 — 653 653 Total amortized cost $ 78,612 $ 160,846 $ 239,458 $ 102,836 $ 206,586 $ 309,422
Financing Receivable Credit Quality Indicators	The following tables summarize commercial, commercial real estate, and equipment financing loans and leases segregated by origination year and risk rating exposure under the Composite Credit Risk Profile grades at June 30, 2021 and December 31, 2020: At June 30, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage Pass $ 1,380,022 $ 1,635,700 $ 921,484 $ 705,932 $ 363,486 $ 398,483 $ 1,068,452 $ 6,473,559 Special mention — 8,973 48,957 56,527 119 16,621 13,134 144,331 Substandard 106 66,050 20,294 66,010 24,011 23,257 25,797 225,525 Commercial non-mortgage 1,380,128 1,710,723 990,735 828,469 387,616 438,361 1,107,383 6,843,415 Asset-based Pass 3,744 27,329 15,127 19,540 6,431 25,584 779,349 877,104 Special mention — — — 725 — — 63,757 64,482 Substandard — — 2,375 — — — — 2,375 Asset-based 3,744 27,329 17,502 20,265 6,431 25,584 843,106 943,961 Commercial real estate Pass 447,624 925,584 1,451,104 1,130,513 491,810 1,565,554 24,998 6,037,187 Special mention 440 2,221 9,182 79,499 54,481 113,566 — 259,389 Substandard — 808 780 21,567 43,028 47,913 — 114,096 Commercial real estate 448,064 928,613 1,461,066 1,231,579 589,319 1,727,033 24,998 6,410,672 Equipment financing Pass 132,213 219,007 123,041 57,096 19,368 47,107 — 597,832 Special mention — 885 4,362 64 99 1,165 — 6,575 Substandard — 9,630 4,943 6,702 2,180 2,481 — 25,936 Equipment financing 132,213 229,522 132,346 63,862 21,647 50,753 — 630,343 Commercial portfolio $ 1,964,149 $ 2,896,187 $ 2,601,649 $ 2,144,175 $ 1,005,013 $ 2,241,731 $ 1,975,487 $ 14,828,391 At December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage Pass $ 2,771,373 $ 1,052,080 $ 907,110 $ 481,321 $ 231,280 $ 218,001 $ 936,592 $ 6,597,757 Special mention 32,535 33,969 62,034 435 8,357 13,757 38,496 189,583 Substandard 54,716 51,798 66,324 36,159 15,535 23,957 49,084 297,573 Doubtful — — — 163 — — — 163 Commercial non-mortgage 2,858,624 1,137,847 1,035,468 518,078 255,172 255,715 1,024,172 7,085,076 Asset-based Pass 26,344 15,960 23,123 11,333 10,963 16,484 741,336 845,543 Special mention — — 775 — — — 41,687 42,462 Substandard — 2,504 — — — — 89 2,593 Asset-based 26,344 18,464 23,898 11,333 10,963 16,484 783,112 890,598 Commercial real estate Pass 965,582 1,461,201 1,242,322 527,931 554,630 1,165,331 28,113 5,945,110 Special mention 27 10,385 70,704 37,539 35,617 69,832 — 224,104 Substandard 817 1,132 21,923 73,621 2,962 52,968 — 153,423 Commercial real estate 966,426 1,472,718 1,334,949 639,091 593,209 1,288,131 28,113 6,322,637 Equipment financing Pass 249,370 135,263 68,092 26,433 43,469 22,879 — 545,506 Special mention 7,934 11,043 6,981 1,220 1,577 788 — 29,543 Substandard 7,483 6,169 5,749 2,460 4,743 571 — 27,175 Equipment financing 264,787 152,475 80,822 30,113 49,789 24,238 — 602,224 Commercial portfolio $ 4,116,181 $ 2,781,504 $ 2,475,137 $ 1,198,615 $ 909,133 $ 1,584,568 $ 1,835,397 $ 14,900,535 To measure credit risk for the consumer portfolio, the most relevant credit characteristic is the FICO score, which is a widely used credit scoring system that ranges from 300 to 850. A lower FICO score is indicative of higher credit risk. FICO scores are updated at least quarterly. The following tables summarize residential and consumer loans segregated by origination year and risk rating exposure under FICO score groupings at June 30, 2021 and December 31, 2020: At June 30, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Residential 800+ $ 216,867 $ 443,796 $ 189,777 $ 41,846 $ 140,310 $ 871,273 $ — $ 1,903,869 740-799 529,874 526,584 210,767 49,417 100,206 550,153 — 1,967,001 670-739 187,435 158,404 85,483 24,678 49,323 265,179 — 770,502 580-669 15,047 11,478 8,213 4,887 11,003 86,098 — 136,726 579 and below 270 411 37,612 1,831 1,216 36,864 — 78,204 Residential 949,493 1,140,673 531,852 122,659 302,058 1,809,567 — 4,856,302 Home equity 800+ 16,759 32,346 12,233 19,613 13,742 66,580 516,121 677,394 740-799 22,141 27,472 10,892 15,092 8,752 43,852 414,822 543,023 670-739 7,528 11,250 7,484 10,464 7,055 42,004 239,265 325,050 580-669 42 1,426 1,923 1,539 2,527 16,935 71,886 96,278 579 and below 110 365 718 984 368 6,214 26,632 35,391 Home equity 46,580 72,859 33,250 47,692 32,444 175,585 1,268,726 1,677,136 Other consumer 800+ 287 1,912 4,131 1,542 436 139 6,735 15,182 740-799 354 8,355 13,497 5,221 766 394 8,145 36,732 670-739 2,094 11,331 21,734 6,653 1,312 362 6,554 50,040 580-669 114 1,604 4,060 1,267 490 259 1,337 9,131 579 and below 93 189 294 241 83 47 1,140 2,087 Other consumer 2,942 23,391 43,716 14,924 3,087 1,201 23,911 113,172 Consumer portfolio 999,015 1,236,923 608,818 185,275 337,589 1,986,353 1,292,637 6,646,610 Commercial portfolio 1,964,149 2,896,187 2,601,649 2,144,175 1,005,013 2,241,731 1,975,487 14,828,391 Loans and leases $ 2,963,164 $ 4,133,110 $ 3,210,467 $ 2,329,450 $ 1,342,602 $ 4,228,084 $ 3,268,124 $ 21,475,001 At December 31, 2020 (In thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Residential 800+ $ 360,336 $ 283,755 $ 61,048 $ 178,849 $ 268,044 $ 805,537 $ — $ 1,957,569 740-799 654,973 288,173 58,249 133,416 176,286 492,720 — 1,803,817 670-739 199,329 118,620 39,125 75,375 76,666 248,268 — 757,383 580-669 17,151 19,389 8,884 11,843 12,225 96,333 — 165,825 579 and below — 36,498 673 3,278 3,179 53,794 — 97,422 Residential 1,231,789 746,435 167,979 402,761 536,400 1,696,652 — 4,782,016 Home equity 800+ 30,604 16,567 25,205 14,439 17,192 59,956 542,600 706,563 740-799 34,797 13,565 19,715 11,073 12,839 43,802 434,271 570,062 670-739 13,753 8,855 10,761 10,206 7,318 44,025 275,691 370,609 580-669 1,708 2,172 2,660 2,234 2,316 16,680 86,126 113,896 579 and below 129 919 880 1,070 1,073 7,163 30,501 41,735 Home equity 80,991 42,078 59,221 39,022 40,738 171,626 1,369,189 1,802,865 Other consumer 800+ 2,827 5,725 2,610 658 115 190 7,171 19,296 740-799 12,317 21,036 8,925 1,493 457 263 5,119 49,610 670-739 14,761 31,952 11,843 2,284 665 228 8,403 70,136 580-669 2,344 5,419 2,360 793 194 124 1,570 12,804 579 and below 608 982 500 183 37 215 1,428 3,953 Other consumer 32,857 65,114 26,238 5,411 1,468 1,020 23,691 155,799 Consumer portfolio 1,345,637 853,627 253,438 447,194 578,606 1,869,298 1,392,880 6,740,680 Commercial portfolio 4,116,181 2,781,504 2,475,137 1,198,615 909,133 1,584,568 1,835,397 14,900,535 Loans and leases $ 5,461,818 $ 3,635,131 $ 2,728,575 $ 1,645,809 $ 1,487,739 $ 3,453,866 $ 3,228,277 $ 21,641,215
Troubled Debt Restructurings on Financing Receivables	The following table summarizes information for TDRs: (In thousands) At June 30, 2021 At December 31, 2020 Accrual status $ 119,707 $ 140,089 Non-accrual status 64,636 95,338 Total TDRs $ 184,343 $ 235,427 Specific reserves for TDRs included in the balance of ACL on loans and leases $ 11,726 $ 12,728 Additional funds committed to borrowers in TDR status 13,512 12,895 The following table provides information on the type of concession for loans modified as TDRs: Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) (Dollars in thousands) Commercial portfolio Extended Maturity 1 $ 50 5 $ 475 8 $ 740 7 $ 579 Maturity/Rate Combined 5 173 — — 6 210 6 552 Other (2) 1 1 13 12,985 3 114 23 40,122 Consumer portfolio Extended Maturity — — 3 244 2 127 4 508 Maturity/Rate Combined 3 415 2 255 8 1,426 6 711 Other (2) 7 535 80 7,461 16 1,201 94 9,187 Total TDRs 17 $ 1,174 103 $ 21,420 43 $ 3,818 140 $ 51,659 (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. TDRs in commercial non-mortgage, commercial real estate, and equipment financing segregated by risk rating exposure is as follows: (In thousands) At June 30, 2021 At December 31, 2020 Pass $ 8,740 $ 12,462 Special Mention 8,670 — Substandard 72,996 105,070 Doubtful — 163 Total $ 90,406 $ 117,695

Transfers of Financial Assets (

Transfers of Financial Assets (Tables)	6 Months Ended
Transfers of Financial Assets (Tables)	Jun. 30, 2021
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) 2021 2020 2021 2020 Beginning balance $ 770 $ 633 $ 747 $ 508 Provision charged to expense 20 27 43 49 (Charge-offs/settlements) recoveries, net (8) (5) (8) 98 Ending balance $ 782 $ 655 $ 782 $ 655
Transfer of Financial Assets Accounted for as Sales	The following table provides information for mortgage banking activities: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Residential mortgage loans held for sale: Proceeds from sale $ 68,427 $ 94,574 $ 147,735 $ 170,168 Loans sold with servicing rights retained 66,087 89,687 141,778 161,778 Net gain on sale 1,351 2,824 3,460 5,343 Ancillary fees 377 824 918 1,225 Fair value option adjustment (409) 557 (417) 530
Servicing Asset at Amortized Cost	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) 2021 2020 2021 2020 Beginning balance $ 12,327 $ 16,391 $ 13,422 $ 17,484 Additions 616 779 1,202 1,968 Amortization (1,442) (1,669) (2,932) (3,376) Adjustment to valuation allowance — (575) (191) (1,150) Ending balance $ 11,501 $ 14,926 $ 11,501 $ 14,926

Leases (Tables)

Leases (Tables)	6 Months Ended
Leases (Tables)	Jun. 30, 2021
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 lease assets and lease liabilities: At June 30, 2021 (In thousands) Operating Leases Condensed Consolidated Balance Sheet Line Item Location ROU lease assets $ 126,145 Premises and equipment, net Lease liabilities 154,461 Operating lease liabilities
Lease, Cost [Table Text Block]	The components of operating lease cost and other related information are as follows: At or for the three months ended June 30, At or for the six months ended June 30, (In thousands) 2021 2020 2021 2020 Lease Cost: Operating lease costs $ 6,554 $ 7,407 $ 13,111 $ 14,831 Variable lease costs 1,351 1,493 2,651 2,920 Sublease income (140) (142) (271) (287) Total operating lease cost $ 7,765 $ 8,758 $ 15,491 $ 17,464 Other Information: Cash paid for amounts included in the measurement of lease liabilities $ 7,672 $ 7,778 $ 15,505 $ 15,536 ROU lease assets obtained in exchange for new operating lease liabilities 4,160 30 9,558 8,696
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, 2021 Remainder of 2021 $ 12,611 2022 28,144 2023 25,900 2024 23,120 2025 21,154 Thereafter 65,902 Total operating lease liability payments 176,831 Less: Present value adjustment 22,370 Lease liabilities $ 154,461 Weighted-average remaining lease term, in years 7.82 Weighted-average discount rate 3.10%

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
Goodwill and Other Intangible Assets (Tables)	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Other intangible assets by reportable segment consisted of the following: At June 30, 2021 At December 31, 2020 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying HSA Bank - Core deposits $ 26,625 $ 17,080 $ 9,545 $ 26,625 $ 15,618 $ 11,007 HSA Bank - Customer relationships 21,000 10,433 10,567 21,000 9,624 11,376 Total other intangible assets $ 47,625 $ 27,513 $ 20,112 $ 47,625 $ 25,242 $ 22,383
Schedule Of Expected Amortization Expense, Next Four Years	At June 30, 2021, the remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) Remainder of 2021 $ 2,242 2022 4,411 2023 4,315 2024 2,084 2025 2,084 Thereafter 4,976

Deposits (Tables)

Deposits (Tables)	6 Months Ended
Deposits (Tables)	Jun. 30, 2021
Deposit Liabilities [Abstract]
Deposit Liabilities, Type [Table Text Block]	A summary of deposits by type is as follows: (In thousands) At June 30, At December 31, Non-interest-bearing: Demand $ 6,751,373 $ 6,155,592 Interest-bearing: Health savings accounts 7,323,421 7,120,017 Checking 3,843,725 3,652,763 Money market 3,442,319 2,940,215 Savings 5,471,584 4,979,031 Time deposits 2,014,544 2,487,818 Total interest-bearing $ 22,095,593 $ 21,179,844 Total deposits $ 28,846,966 $ 27,335,436 Time deposits and interest-bearing checking obtained through brokers (included in above balances) $ 112,732 $ 720,440 Time deposits that exceed the FDIC limit (included in above balance) 337,866 504,543 Deposit overdrafts reclassified as loan balances 1,050 2,007
Time Deposit Maturities [Table Text Block]	The scheduled maturities of time deposits are as follows: (In thousands) At June 30, Remainder of 2021 $ 1,253,018 2022 566,946 2023 91,793 2024 39,125 2025 50,983 Thereafter 12,679 Total time deposits $ 2,014,544

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
Borrowings (Tables)	Jun. 30, 2021
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, (Dollars in thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) : Original maturity of one year or less $ 307,124 0.11 % $ 269,330 0.13 % Original maturity of greater than one year, non-callable 200,000 1.47 200,000 0.84 Total securities sold under agreements to repurchase 507,124 0.65 469,330 0.43 Fed funds purchased — — 526,025 0.08 Securities sold under agreements to repurchase and other borrowings $ 507,124 0.65 $ 995,355 0.25
Federal Home Loan Bank, Advances	The following table provides information for FHLB advances: At June 30, 2021 At December 31, 2020 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 25,000 0.33 % $ 25,000 0.38 % After 1 but within 2 years 100 — 110 — After 2 but within 3 years 208 2.95 215 2.95 After 3 but within 4 years 100,000 1.50 50,000 1.59 After 4 but within 5 years — — 50,000 1.42 After 5 years 13,136 2.56 7,839 2.66 FHLB advances $ 138,444 1.39 $ 133,164 1.36 Aggregate carrying value of assets pledged as collateral $ 7,004,625 $ 7,387,054 Remaining borrowing capacity 4,528,972 4,689,642
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) 341,488 344,164 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total notes and subordinated debt 568,808 571,484 Discount on senior fixed-rate notes (1,084) (1,193) Debt issuance cost on senior fixed-rate notes (2,427) (2,628) Long-term debt $ 565,297 $ 567,663 (1) The Company de-designated its fair value hedging relationship on these notes. A basis adjustment is included in the carrying value, which is being amortized over the remaining life of the notes. (2) The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 3.07% at June 30, 2021 and 3.18% at December 31, 2020.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income, Net of Tax (Tables)	6 Months Ended
Accumulated Other Comprehensive Income, Net of Tax (Tables)	Jun. 30, 2021
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss by Component	The following table summarizes the changes in each component of accumulated other comprehensive income (loss), net of tax: Three months ended June 30, 2021 Six months ended June 30, 2021 (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 $ 37,071 $ 15,546 $ (44,343) $ 8,274 $ 67,424 $ 19,918 $ (45,086) $ 42,256 Other comprehensive (loss) before reclassifications (1,473) (2,475) — (3,948) (31,826) (7,645) — (39,471) Amounts reclassified from accumulated other comprehensive (loss) — 823 741 1,564 — 1,621 1,484 3,105 Net current-period other comprehensive (loss) income, net of tax (1,473) (1,652) 741 (2,384) (31,826) (6,024) 1,484 (36,366) Ending balance $ 35,598 $ 13,894 $ (43,602) $ 5,890 $ 35,598 $ 13,894 $ (43,602) $ 5,890 Three months ended June 30, 2020 Six months ended June 30, 2020 (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 $ 1,562 $ 17,048 $ (43,410) $ (24,800) $ 17,251 $ (9,184) $ (44,139) $ (36,072) Other comprehensive income before reclassifications 61,914 2,186 — 64,100 46,231 26,965 — 73,196 Amounts reclassified from accumulated other comprehensive income — 1,415 730 2,145 (6) 2,868 1,459 4,321 Net current-period other comprehensive income, net of tax 61,914 3,601 730 66,245 46,225 29,833 1,459 77,517 Ending balance $ 63,476 $ 20,649 $ (42,680) $ 41,445 $ 63,476 $ 20,649 $ (42,680) $ 41,445
Schedule of Accumulated Other Comprehensive Loss	The following table further details the amounts reclassified from accumulated other comprehensive income (loss): (In thousands) Three months ended June 30, Six months ended June 30, Associated Line Item on the Condensed Consolidated Statements of Income AOCI (AOCL) Component 2021 2020 2021 2020 Securities available-for-sale: Unrealized gains on investment securities $ — $ — $ — $ 8 Gain on sale of investment securities, net Tax expense — — — (2) Income tax expense Net of tax $ — $ — $ — $ 6 Derivative instruments: Hedge terminations $ (1,037) $ (1,088) $ (2,042) $ (2,261) Interest expense Premium amortization (77) (828) (153) (1,622) Interest income Tax benefit 291 501 574 1,015 Income tax expense Net of tax $ (823) $ (1,415) $ (1,621) $ (2,868) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,007) $ (990) $ (2,015) $ (1,980) Other non-interest expense Tax benefit 266 260 531 521 Income tax expense Net of tax $ (741) $ (730) $ (1,484) $ (1,459)

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
Regulatory Matters (Tables)	Jun. 30, 2021
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, 2021 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,664,879 11.66 % $ 1,028,123 4.5 % $ 1,485,067 6.5 % Total risk-based capital 3,130,000 13.70 1,827,774 8.0 2,284,718 10.0 Tier 1 risk-based capital 2,809,916 12.30 1,370,831 6.0 1,827,774 8.0 Tier 1 leverage capital 2,809,916 8.53 1,317,538 4.0 1,646,923 5.0 Webster Bank CET1 risk-based capital $ 2,897,545 12.69 % $ 1,027,620 4.5 % $ 1,484,340 6.5 % Total risk-based capital 3,140,309 13.75 1,826,881 8.0 2,283,601 10.0 Tier 1 risk-based capital 2,897,545 12.69 1,370,160 6.0 1,826,881 8.0 Tier 1 leverage capital 2,897,545 8.80 1,317,166 4.0 1,646,458 5.0 At December 31, 2020 Actual Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,543,131 11.35 % $ 1,008,512 4.5 % $ 1,456,739 6.5 % Total risk-based capital 3,045,652 13.59 1,792,910 8.0 2,241,137 10.0 Tier 1 risk-based capital 2,688,168 11.99 1,344,682 6.0 1,792,910 8.0 Tier 1 leverage capital 2,688,168 8.32 1,291,980 4.0 1,614,975 5.0 Webster Bank CET1 risk-based capital $ 2,791,474 12.46 % $ 1,008,027 4.5 % $ 1,456,039 6.5 % Total risk-based capital 3,071,505 13.71 1,792,048 8.0 2,240,060 10.0 Tier 1 risk-based capital 2,791,474 12.46 1,344,036 6.0 1,792,048 8.0 Tier 1 leverage capital 2,791,474 8.65 1,291,415 4.0 1,614,268 5.0

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
Earnings Per Common Share (Tables)	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share Basic And Diluted	A reconciliation of the calculation of basic and diluted earnings per common share is as follows: Three months ended June 30, Six months ended June 30, (In thousands, except per share data) 2021 2020 2021 2020 Earnings for basic and diluted earnings per common share: Net income $ 94,035 $ 53,097 $ 202,113 $ 91,296 Less: Preferred stock dividends 1,969 1,969 3,938 3,938 Net income available to common shareholders 92,066 51,128 198,175 87,358 Less: Earnings applicable to participating securities (1) 511 399 1,090 592 Earnings applicable to common shareholders $ 91,555 $ 50,729 $ 197,085 $ 86,766 Shares: Weighted-average common shares outstanding - basic 90,027 89,485 89,918 90,206 Effect of dilutive securities 194 85 246 185 Weighted-average common shares outstanding - diluted 90,221 89,570 90,164 90,391 Earnings per common share (1) : Basic $ 1.02 $ 0.57 $ 2.19 $ 0.96 Diluted 1.01 0.57 2.19 0.96 (1) Earnings per common share amounts under the two-class method for unvested time-based restricted stock with non-forfeitable dividends and dividend rights are computed the same as the presentation above.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
Derivative Financial Instruments (Tables)	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table presents the notional amounts and fair values of derivative positions: At June 30, 2021 At December 31, 2020 Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives (In thousands) Notional Fair Notional Fair Notional Fair Notional Fair Designated as hedging instruments: Interest rate derivatives (1) $ 1,000,000 $ 29,179 $ 25,000 $ 14 $ 1,000,000 $ 39,641 $ 25,000 $ 103 Not designated as hedging instruments: Interest rate derivatives (1) 4,526,290 196,438 4,422,119 16,137 4,533,441 292,096 4,356,339 11,874 Mortgage banking derivatives (2) 32,078 263 1,294 2 40,771 855 — — Other (3) 108,871 354 309,867 139 108,987 264 360,497 377 Total not designated as hedging instruments 4,667,239 197,055 4,733,280 16,278 4,683,199 293,215 4,716,836 12,251 Gross derivative instruments, before netting $ 5,667,239 226,234 $ 4,758,280 16,292 $ 5,683,199 332,856 $ 4,741,836 12,354 Less: Master netting agreements 4,724 4,724 7,522 7,522 Cash collateral 30,234 2,996 33,043 4,485 Total derivative instruments, after netting $ 191,276 $ 8,572 $ 292,291 $ 347 (1) Balances related to Chicago Mercantile Exchange (CME), excluding accrued interest, are presented as a single unit of account. In accordance with its rule book, CME legally characterizes variation margin payments as settlement of derivatives rather than collateral against derivative positions. Notional amounts of interest rate swaps cleared through CME include $0.2 billion and $0.1 billion for asset derivatives and $3.0 billion and $3.2 billion for liability derivatives at June 30, 2021 and December 31, 2020, respectively. The related fair values approximate zero. (2) Notional amounts related to residential loans exclude approved floating rate commitments of $1.2 million at June 30, 2021. (3) Other derivatives include foreign currency forward contracts related to lending arrangements and customer hedging activity, a Visa equity swap transaction, and risk participation agreements. Notional amounts of risk participation agreements include $83.1 million and $80.5 million for asset derivatives and $306.8 million and $338.9 million for liability derivatives at June 30, 2021 and December 31, 2020, respectively, that have insignificant related fair values.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table presents fair value positions transitioned from gross to net upon applying contractual counterparty netting agreements: At June 30, 2021 (In thousands) Gross Offset Amount Net Amount on Balance Sheet Amounts Not Offset Net Amounts Asset derivatives $ 34,958 $ 34,958 $ — $ 134 $ 134 Liability derivatives 7,720 7,720 — 1,915 1,915 At December 31, 2020 (In thousands) Gross Offset Amount Net Amount on Balance Sheet Amounts Not Offset Net Amounts Asset derivatives $ 40,565 $ 40,565 $ — $ 785 $ 785 Liability derivatives 12,007 12,007 — 1,247 1,247
Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table presents the income statement effect of derivatives designated as cash flow hedges: Recognized In Three months ended June 30, Six months ended June 30, (In thousands) Net Interest Income 2021 2020 2021 2020 Interest rate derivatives Long-term debt $ 123 $ 1,228 $ 244 $ 2,349 Interest rate derivatives Interest and fees on loans and leases (2,645) (1,837) (5,227) (1,097) Net recognized on cash flow hedges $ (2,522) $ (609) $ (4,983) $ 1,252 Condensed Consolidated Balance Sheet Line Item in Which Hedged Item is Located Carrying Amount of Previously Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount (In thousands) At June 30, At December 31, At June 30, At December 31, Long-term debt $ 341,488 $ 344,164 $ 41,488 $ 44,164
Other Derivatives Not Designated For Hedge Accounting	The following table presents the effect on the income statement for derivatives not designated as hedging instruments: Recognized In Three months ended June 30, Six months ended June 30, (In thousands) Non-interest Income 2021 2020 2021 2020 Interest rate derivatives Other income $ (239) $ (2,523) $ 4,405 $ 3,403 Mortgage banking derivatives Mortgage banking activities (212) 633 (594) 1,626 Other Other income (303) (1,014) 169 897 Total not designated as hedging instruments $ (754) $ (2,904) $ 3,980 $ 5,926

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Option, Disclosures	At June 30, 2021 At December 31, 2020 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 4,335 $ 4,845 $ (510) $ 14,000 $ 13,511 $ 489
Fair Value Of Assets And Liabilities Measured On Recurring Basis	A summary of the financial assets and liabilities measured at fair value on a recurring basis is as follows: At June 30, 2021 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: Agency CMO $ — $ 120,328 $ — $ 120,328 Agency MBS — 1,382,530 — 1,382,530 Agency CMBS — 941,397 — 941,397 CMBS — 754,970 — 754,970 CLO — 49,964 — 49,964 Corporate debt — 13,704 — 13,704 Total available-for-sale investment securities — 3,262,893 — 3,262,893 Gross derivative instruments, before netting (1) 317 225,917 — 226,234 Originated loans held for sale — 4,335 — 4,335 Investments held in Rabbi Trust 3,617 — — 3,617 Alternative investments (2) — — — 18,002 Total financial assets held at fair value $ 3,934 $ 3,493,145 $ — $ 3,515,081 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 51 $ 16,241 $ — $ 16,292 At December 31, 2020 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: Agency CMO $ — $ 154,613 $ — $ 154,613 Agency MBS — 1,457,409 — 1,457,409 Agency CMBS — 1,117,233 — 1,117,233 CMBS — 508,018 — 508,018 CLO — 76,383 — 76,383 Corporate debt — 13,120 — 13,120 Total available-for-sale investment securities — 3,326,776 — 3,326,776 Gross derivative instruments, before netting (1) 205 332,651 — 332,856 Originated loans held for sale — 14,000 — 14,000 Investments held in Rabbi Trust 4,811 — — 4,811 Alternative investments (2) — — — 11,112 Total financial assets held at fair value $ 5,016 $ 3,673,427 $ — $ 3,689,555 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 218 $ 12,136 $ — $ 12,354 (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, refer to Note 14: Derivative Financial Instruments. (2) Alternative investments are recorded at NAV. Assets measured at NAV are not classified within the fair value hierarchy.
Summary Of Estimated Fair Values Of Significant Financial Instruments	The carrying amounts, estimated fair values, and classifications within the fair value hierarchy of selected financial instruments and servicing assets are summarized as follows: At June 30, 2021 At December 31, 2020 (In thousands) Carrying Fair Carrying Fair Assets: Level 2 Held-to-maturity investment securities, net $ 5,623,243 $ 5,794,155 $ 5,567,889 $ 5,835,364 Level 3 Loans and leases, net 21,167,056 21,242,694 21,281,784 21,413,397 Mortgage servicing assets 11,501 16,578 13,422 14,362 Liabilities: Level 2 Deposit liabilities $ 26,832,422 $ 26,832,422 $ 24,847,618 $ 24,847,618 Time deposits 2,014,544 2,016,468 2,487,818 2,494,601 Securities sold under agreements to repurchase and other borrowings 507,124 513,384 995,355 1,000,189 FHLB advances 138,444 142,736 133,164 139,035 Long-term debt (1) 565,297 523,139 567,663 538,407 (1) Adjustments to the carrying amount of long-term debt for basis adjustment and unamortized discount and debt issuance cost on senior fixed-rate notes are not included in the determination of fair value. Refer to Note 10: Borrowings for additional information.

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	6 Months Ended
Retirement Benefit Plans (Tables)	Jun. 30, 2021
Retirement Benefits [Abstract]
Summary of Net Periodic Benefit Cost	The following table summarizes the components of net periodic benefit (income) cost: Three months ended June 30, 2021 2020 (In thousands) Pension Plan SERP Other Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 1,166 $ 6 $ 4 $ 1,675 $ 12 $ 12 Expected return on plan assets (3,596) — — (3,380) — — Recognized net loss (gain) 1,020 9 (20) 993 6 (8) Net periodic benefit (income) cost $ (1,410) $ 15 $ (16) $ (712) $ 18 $ 4 Six months ended June 30, 2021 2020 (In thousands) Pension Plan SERP Other Benefits Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 2,332 $ 13 $ 8 $ 3,350 $ 23 $ 25 Expected return on plan assets (7,191) — — (6,760) — — Recognized net loss (gain) 2,039 17 (40) 1,985 12 (17) Net periodic benefit (income) cost $ (2,820) $ 30 $ (32) $ (1,425) $ 35 $ 8

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
Segment Reporting (Tables)	Jun. 30, 2021
Segment Reporting [Abstract]
Operating Results And Total Assets Reportable Segments	The following table presents balance sheet information, including all appropriate allocations, for Webster's reportable segments and the Corporate and Reconciling category: At June 30, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Goodwill $ 131,000 $ 21,813 $ 385,560 $ — $ 538,373 Total assets $ 14,837,710 $ 78,054 $ 7,432,340 $ 11,405,648 $ 33,753,752 At December 31, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Goodwill $ 131,000 $ 21,813 $ 385,560 $ — $ 538,373 Total assets $ 14,732,792 $ 80,352 $ 7,726,287 $ 10,051,259 $ 32,590,690 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, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 141,124 $ 42,193 $ 92,540 $ (55,005) $ 220,852 Non-interest income 25,713 26,554 16,763 3,672 72,702 Non-interest expense 61,445 32,792 72,346 20,445 187,028 Pre-tax, pre-provision net revenue 105,392 35,955 36,957 (71,778) 106,526 Provision for credit losses (23,328) — 1,754 74 (21,500) Income before income tax expense 128,720 35,955 35,203 (71,852) 128,026 Income tax expense 32,566 9,600 7,745 (15,920) 33,991 Net income $ 96,154 $ 26,355 $ 27,458 $ (55,932) $ 94,035 Three months ended June 30, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 128,123 $ 39,334 $ 81,609 $ (24,659) $ 224,407 Non-interest income 21,849 23,103 16,281 (1,157) 60,076 Non-interest expense 61,261 34,020 77,119 4,184 176,584 Pre-tax, pre-provision net revenue 88,711 28,417 20,771 (30,000) 107,899 Provision for credit losses 43,569 — (3,566) (3) 40,000 Income before income tax expense 45,142 28,417 24,337 (29,997) 67,899 Income tax expense 11,015 7,587 5,305 (9,105) 14,802 Net income $ 34,127 $ 20,830 $ 19,032 $ (20,892) $ 53,097 Six months ended June 30, 2021 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Net interest income $ 283,162 $ 84,302 $ 181,353 $ (104,201) $ 444,616 Non-interest income 50,890 53,559 32,834 12,176 149,459 Non-interest expense 126,281 69,042 148,470 31,217 $ 375,010 Pre-tax, pre-provision net revenue 207,771 $ 68,819 65,717 (123,242) 219,065 Provision for credit losses (42,701) — (4,632) 83 (47,250) Income before income tax expense 250,472 68,819 70,349 (123,325) 266,315 Income tax expense 63,369 18,375 15,477 (33,019) 64,202 Net income $ 187,103 $ 50,444 $ 54,872 $ (90,306) $ 202,113 Six months ended June 30, 2020 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Net interest income $ 245,710 $ 82,007 $ 162,808 $ (35,317) $ 455,208 Non-interest income 44,265 49,486 34,724 4,979 133,454 Non-interest expense 126,482 71,098 157,409 431 355,420 Pre-tax, pre-provision net revenue 163,493 60,395 40,123 (30,769) 233,242 Provision for credit losses 112,587 — 3,501 (88) 116,000 Income before income tax expense 50,906 60,395 36,622 (30,681) 117,242 Income tax expense 12,421 16,125 7,983 (10,583) 25,946 Net income $ 38,485 $ 44,270 $ 28,639 $ (20,098) $ 91,296

Revenue from Contracts with C_2

Revenue from Contracts with Customers Disaggregation of Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following table presents revenues within the scope of ASC Topic 606, Revenue from Contracts with Customers, along with the net amount of other sources of non-interest income that are within the scope of other GAAP topics, by reportable segment: Three months ended June 30, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 4,104 $ 24,478 $ 12,734 $ 123 $ 41,439 Wealth and investment services 10,096 — — (9) 10,087 Other 276 2,076 303 — 2,655 Revenue from contracts with customers 14,476 26,554 13,037 114 54,181 Other sources of non-interest income 11,237 — 3,726 3,558 18,521 Total non-interest income $ 25,713 $ 26,554 $ 16,763 $ 3,672 $ 72,702 Three months ended June 30, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 3,443 $ 21,741 $ 10,748 $ (93) $ 35,839 Wealth and investment services 7,140 — — (38) 7,102 Other 363 1,362 377 — 2,102 Revenue from contracts with customers 10,946 23,103 11,125 (131) 45,043 Other sources of non-interest income 10,903 — 5,156 (1,026) 15,033 Total non-interest income $ 21,849 $ 23,103 $ 16,281 $ (1,157) $ 60,076 Six months ended June 30, 2021 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 8,205 $ 49,496 $ 24,037 $ 170 $ 81,908 Wealth and investment services 19,508 — — (18) 19,490 Other 578 4,063 549 — 5,190 Revenue from contracts with customers 28,291 53,559 24,586 152 106,588 Other sources of non-interest income 22,599 — 8,248 12,024 42,871 Total non-interest income $ 50,890 $ 53,559 $ 32,834 $ 12,176 $ 149,459 Six months ended June 30, 2020 (In thousands) Commercial HSA Retail Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 7,354 $ 46,583 $ 24,488 $ (16) $ 78,409 Wealth and investment services 15,886 — — (45) 15,841 Other 619 2,903 438 — 3,960 Revenue from contracts with customers 23,859 49,486 24,926 (61) 98,210 Other sources of non-interest income 20,406 — 9,798 5,040 35,244 Total non-interest income $ 44,265 $ 49,486 $ 34,724 $ 4,979 $ 133,454

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
Commitments and Contingencies (Tables)	Jun. 30, 2021
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, 2020 Commitments to extend credit $ 7,143,906 $ 6,517,840 Standby letters of credit 213,751 207,201 Commercial letters of credit 50,120 30,522 Total credit-related financial instruments with off-balance sheet risk $ 7,407,777 $ 6,755,563
Activity In Allowance For Losses	The following table summarizes the activity in, as well as the loan and lease balances that were evaluated for, ACL on loans and leases: At or for the three months ended June 30, 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 283,906 $ 44,445 $ 328,351 $ 261,926 $ 73,005 $ 334,931 (Benefit) provision (21,077) (497) (21,574) 44,605 (4,602) 40,003 Charge-offs (594) (2,808) (3,402) (15,294) (2,780) (18,074) Recoveries 836 3,734 4,570 283 1,379 1,662 Balance, end of period $ 263,071 $ 44,874 $ 307,945 $ 291,520 $ 67,002 $ 358,522 At or for the six months ended June 30, 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 312,244 $ 47,187 $ 359,431 $ 161,669 $ 47,427 $ 209,096 Adoption of ASU No. 2016-13 (CECL) — — — 34,024 23,544 57,568 (Benefit) provision (44,730) (2,603) (47,333) 115,848 240 116,088 Charge-offs (6,915) (5,782) (12,697) (20,868) (7,367) (28,235) Recoveries 2,472 6,072 8,544 847 3,158 4,005 Balance, end of period $ 263,071 $ 44,874 $ 307,945 $ 291,520 $ 67,002 $ 358,522 Individually evaluated for impairment 11,537 4,560 16,097 15,271 4,484 19,755 Collectively evaluated for impairment $ 251,534 $ 40,314 $ 291,848 $ 276,249 $ 62,518 $ 338,767 Loan and lease balances: Individually evaluated for impairment $ 128,937 $ 110,521 $ 239,458 $ 165,010 $ 158,146 $ 323,156 Collectively evaluated for impairment 14,699,454 6,536,089 21,235,543 14,589,073 6,890,288 21,479,361 Loans and leases $ 14,828,391 $ 6,646,610 $ 21,475,001 $ 14,754,083 $ 7,048,434 $ 21,802,517 The following table provides a summary of activity in the allowance for credit losses on unfunded loan commitments: Three months ended June 30, Six months ended June 30, (In thousands) 2021 2020 2021 2020 Beginning balance $ 12,800 $ 10,084 $ 12,755 $ 2,367 Adoption of ASU No. 2016-13 (CECL) — — — 9,139 (Benefit) provision (826) 655 (781) (767) Ending balance $ 11,974 $ 10,739 $ 11,974 $ 10,739

Business Developments (Tables)

Business Developments (Tables)	6 Months Ended
Business Developments (Tables)	Jun. 30, 2021
Business Combination and Restructuring and Related Activities [Abstract]
Schedule of Changes in Reserves Associated with Strategic Initiatives	The following table presents the changes in reserves associated with the Company's strategic initiatives for the three and six months ended June 30, 2021: Three months ended June 30, 2021 (In thousands) Severance ROU Asset Other Total Beginning balance $ 18,370 $ — $ 4,545 $ 22,915 Charged to earnings 45 30 1,063 1,138 Charged against assets — (30) (332) (362) Cash payments (4,451) — (3,046) (7,497) Ending balance $ 13,964 $ — $ 2,230 $ 16,194 Six months ended June 30, 2021 Severance ROU Asset Other Total Beginning balance $ 17,675 $ — $ 2,120 $ 19,795 Charged to earnings 2,105 209 8,265 10,579 Charged against assets — (209) (1,966) (2,175) Cash payments (5,816) — (6,189) (12,005) Ending balance $ 13,964 $ — $ 2,230 $ 16,194

Variable Interest Entities (Var

Variable Interest Entities (Variable Interest Entity, Consolidated, Carrying Amount, Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 33,753,752	$ 32,590,690
Liabilities	30,424,047	29,356,065
Other Assets [Member] \| Tax Credit - Finance Investments \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	44,700	37,200
Accounts Payable and Accrued Liabilities [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Liabilities		10,200
Accounts Payable and Accrued Liabilities [Member] \| Tax Credit - Finance Investments \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Liabilities	12,700
Other Investments [Member] \| Other Non-Marketable Investments \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	44,700	34,300
Unfunded Loan Commitment [Member] \| Other Non-Marketable Investments \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 78,200	$ 72,700

Investments, Debt and Equity Se

Investments, Debt and Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Amortized Cost(1)	$ 5,623,625		$ 5,568,188
Unrealized Gains	190,822		269,717
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(20,292)		(2,541)
Debt Securities, Held-to-maturity, Fair Value	5,794,155		5,835,364
Allowance for credit losses on investment securities held-to-maturity	382	$ 308	299	$ 309	$ 312	$ 0
Net Carrying Value	5,623,243		5,567,889
Interest receivable	20,900		22,100
Agency CMO [Member]
Schedule of Investments [Line Items]
Amortized Cost(1)	61,080		91,622
Unrealized Gains	1,425		1,785
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(63)		(241)
Debt Securities, Held-to-maturity, Fair Value	62,442		93,166
Allowance for credit losses on investment securities held-to-maturity	0		0
Net Carrying Value	61,080		91,622
Agency MBS [Member]
Schedule of Investments [Line Items]
Amortized Cost(1)	2,562,863		2,419,751
Unrealized Gains	96,187		137,863
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(3,684)		(84)
Debt Securities, Held-to-maturity, Fair Value	2,655,366		2,557,530
Allowance for credit losses on investment securities held-to-maturity	0		0
Net Carrying Value	2,562,863		2,419,751
Agency Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost(1)	2,105,924		2,101,227
Unrealized Gains	30,491		60,484
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(16,545)		(2,213)
Debt Securities, Held-to-maturity, Fair Value	2,119,870		2,159,498
Allowance for credit losses on investment securities held-to-maturity	0		0
Net Carrying Value	2,105,924		2,101,227
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost(1)	715,195		739,507
Unrealized Gains	56,218		60,371
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0		(3)
Debt Securities, Held-to-maturity, Fair Value	771,413		799,875
Allowance for credit losses on investment securities held-to-maturity	382		299
Net Carrying Value	714,813		739,208
Non-agency CMBS [Member]
Schedule of Investments [Line Items]
Amortized Cost(1)	178,563		216,081
Unrealized Gains	6,501		9,214
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0		0
Debt Securities, Held-to-maturity, Fair Value	185,064		225,295
Allowance for credit losses on investment securities held-to-maturity	0		0
Net Carrying Value	$ 178,563		$ 216,081

Investments, Debt and Equity _2

Investments, Debt and Equity Securities Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Beginning Balance	$ 308	$ 312	$ 299	$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery	74	(3)	83	(88)
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Ending Balance	382	309	382	309
Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Beginning Balance	$ 0	$ 0	$ 0	$ 397

Investment Securities (Summary

Investment Securities (Summary Of Debt Securities Held-to Maturity) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
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	$ 380
Held-to-maturity, Amortized Cost - Due after one year through five years	4,843
Held-to-maturity, Amortized Cost - Due after five through ten years	285,191
Held-to-maturity, Amortized Cost - Due after ten years	5,333,211
Amortized Cost(1)	5,623,625	$ 5,568,188
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, Fair Value - Due in one year or less	384
Held-to-maturity, Fair Value - Due after one year through five years	5,163
Held to maturity, Fair Value - Due after five through ten years	298,449
Held to maturity, Fair Value - Due after ten years	5,490,159
Fair Value(2)	5,794,155	5,835,364
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	14,245	9,471
Amortized Cost	3,213,570	3,234,250
Unrealized Gains	63,568	101,997
Investment securities available-for-sale, at fair value	3,262,893	3,326,776
Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	387,178
Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	4,850,040
Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	227,856
Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	108,619
Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	36,087
Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	8,468
Moody's, A3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	2,066
Moody's, Baa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	190
Moody's, Not Rated
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	3,121
Agency CMO [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	61,080	91,622
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	62,442	93,166
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	23	98
Amortized Cost	115,985	148,711
Unrealized Gains	4,366	6,000
Investment securities available-for-sale, at fair value	120,328	154,613
Agency CMO [Member] \| Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	61,080
Agency CMO [Member] \| Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, A3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, Baa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMO [Member] \| Moody's, Not Rated
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	2,562,863	2,419,751
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	2,655,366	2,557,530
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4,905	289
Amortized Cost	1,339,769	1,389,100
Unrealized Gains	47,666	68,598
Investment securities available-for-sale, at fair value	1,382,530	1,457,409
Agency MBS [Member] \| Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	2,562,863
Agency MBS [Member] \| Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, A3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, Baa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency MBS [Member] \| Moody's, Not Rated
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	2,105,924	2,101,227
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	2,119,870	2,159,498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	8,167	1,514
Amortized Cost	939,055	1,092,430
Unrealized Gains	10,509	26,317
Investment securities available-for-sale, at fair value	941,397	1,117,233
Agency CMBS [Member] \| Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	2,105,924
Agency CMBS [Member] \| Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, A3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, Baa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Agency CMBS [Member] \| Moody's, Not Rated
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Municipal bonds and notes [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	715,195	739,507
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	771,413	799,875
Municipal bonds and notes [Member] \| Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	208,615
Municipal bonds and notes [Member] \| Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	120,173
Municipal bonds and notes [Member] \| Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	227,856
Municipal bonds and notes [Member] \| Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	108,619
Municipal bonds and notes [Member] \| Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	36,087
Municipal bonds and notes [Member] \| Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	8,468
Municipal bonds and notes [Member] \| Moody's, A3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	2,066
Municipal bonds and notes [Member] \| Moody's, Baa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	190
Municipal bonds and notes [Member] \| Moody's, Not Rated
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	3,121
Non-agency CMBS [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	178,563	216,081
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	185,064	225,295
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	230	5,823
Amortized Cost	754,192	512,759
Unrealized Gains	1,008	1,082
Investment securities available-for-sale, at fair value	754,970	508,018
Non-agency CMBS [Member] \| Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	178,563
Non-agency CMBS [Member] \| Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, A3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, Baa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
Non-agency CMBS [Member] \| Moody's, Not Rated
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	0
CLO [Member]
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	44	310
Amortized Cost	50,000	76,693
Unrealized Gains	8	0
Investment securities available-for-sale, at fair value	49,964	76,383
Corporate Debt Securities [Member]
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	876	1,437
Amortized Cost	14,569	14,557
Unrealized Gains	11	0
Investment securities available-for-sale, at fair value	$ 13,704	$ 13,120

Investment Securities (Summar_2

Investment Securities (Summary Of Debt Securities Available-for-Sale) (Detail) $ in Thousands	Jun. 30, 2021USD ($)holding	Dec. 31, 2020USD ($)holding
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 3,213,570	$ 3,234,250
Unrealized Gains	63,568	101,997
Unrealized Losses	(14,245)	(9,471)
Investment securities available-for-sale, at fair value	3,262,893	3,326,776
Interest receivable	6,700	7,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	936,469	894,628
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(12,987)	(7,699)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	170,236	61,347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,258)	$ (1,772)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	92	88
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,106,705	$ 955,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(14,245)	(9,471)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	0
Available-for-sale, Amortized Cost - Due after one year through five years	2,614
Available-for-sale, Amortized Cost - Due after five through ten years	183,925
Available-for-sale, Amortized Cost - Due after ten years	3,027,031
Amortized Cost - Total available-for-sale debt securities	3,213,570	3,234,250
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale, Fair Value - Due in one year or less	0
Available-for-sale, Fair Value - Due after one year through five years	2,703
Available-for-sale, Fair Value - Due after five through ten years	184,105
Available-for-sale, Fair Value - Due after ten years	3,076,085
Fair Value, Total available-for-sale debt securities	3,262,893	3,326,776
Agency CMO [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	115,985	148,711
Unrealized Gains	4,366	6,000
Unrealized Losses	(23)	(98)
Investment securities available-for-sale, at fair value	120,328	154,613
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,879	13,137
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(8)	(49)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,580	5,944
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (15)	$ (49)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	3	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 6,459	$ 19,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(23)	(98)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized Cost - Total available-for-sale debt securities	115,985	148,711
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, Total available-for-sale debt securities	120,328	154,613
Agency MBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,339,769	1,389,100
Unrealized Gains	47,666	68,598
Unrealized Losses	(4,905)	(289)
Investment securities available-for-sale, at fair value	1,382,530	1,457,409
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	224,986	33,742
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(4,687)	(219)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15,482	4,561
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (218)	$ (70)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	46	30
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 240,468	$ 38,303
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,905)	(289)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized Cost - Total available-for-sale debt securities	1,339,769	1,389,100
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, Total available-for-sale debt securities	1,382,530	1,457,409
Agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	939,055	1,092,430
Unrealized Gains	10,509	26,317
Unrealized Losses	(8,167)	(1,514)
Investment securities available-for-sale, at fair value	941,397	1,117,233
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	421,812	376,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(8,167)	(1,514)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	11	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 421,812	$ 376,330
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(8,167)	(1,514)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized Cost - Total available-for-sale debt securities	939,055	1,092,430
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, Total available-for-sale debt securities	941,397	1,117,233
Non-agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	754,192	512,759
Unrealized Gains	1,008	1,082
Unrealized Losses	(230)	(5,823)
Investment securities available-for-sale, at fair value	754,970	508,018
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	285,792	409,591
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(125)	(5,486)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	117,796	23,167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (105)	$ (337)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	29	38
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 403,588	$ 432,758
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(230)	(5,823)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized Cost - Total available-for-sale debt securities	754,192	512,759
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, Total available-for-sale debt securities	754,970	508,018
CLO [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	50,000	76,693
Unrealized Gains	8	0
Unrealized Losses	(44)	(310)
Investment securities available-for-sale, at fair value	49,964	76,383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		57,728
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(265)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	24,956	18,655
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (44)	$ (45)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	1	4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 24,956	$ 76,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(44)	(310)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized Cost - Total available-for-sale debt securities	50,000	76,693
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, Total available-for-sale debt securities	49,964	76,383
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	14,569	14,557
Unrealized Gains	11	0
Unrealized Losses	(876)	(1,437)
Investment securities available-for-sale, at fair value	13,704	13,120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	4,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(166)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,422	9,020
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (876)	$ (1,271)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| holding	2	3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 9,422	$ 13,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(876)	(1,437)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized Cost - Total available-for-sale debt securities	14,569	14,557
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, Total available-for-sale debt securities	$ 13,704	$ 13,120

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - USD ($)	3 Months Ended	6 Months Ended
Investment Securities (Narrative) (Detail) - USD ($)	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Held-to-maturity investment securities in non-accrual status		$ 0
Proceeds from Sale of Available-for-sale Securities		0	$ 8,963,000
Debt Securities, Available-for-sale, Realized Gain			8,000
Available-for-sale Securities, Gross Realized Gains		0	8,000
Investment securities available-for-sale, at fair value		3,262,893,000		$ 3,326,776,000
Held-to-maturity securities pledged		2,700,000,000		2,600,000,000
Available-for-sale securities pledged		1,400,000,000		1,300,000,000
Corporate Debt Securities [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Proceeds from Sale of Available-for-sale Securities	$ 0		$ 9,000,000
Investment securities available-for-sale, at fair value		13,704,000		$ 13,120,000
Callable [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Investment securities available-for-sale, at fair value		$ 1,500,000,000

Loans and Leases (Detail)

Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 21,475,001	$ 21,641,215	$ 21,802,517
Unamortized premiums	(13,500)	(10,500)
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral	7,300,000
Interest receivable	54,600	57,800
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,828,391	14,900,535	14,754,083
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,843,415	7,085,076
Commercial Portfolio Segment [Member] \| Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	943,961	890,598
Commercial Portfolio Segment [Member] \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,410,672	6,322,637
Commercial Portfolio Segment [Member] \| Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	630,343	602,224
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,646,610	6,740,680	$ 7,048,434
Consumer Portfolio Segment [Member] \| Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,856,302	4,782,016
Consumer Portfolio Segment [Member] \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,677,136	1,802,865
Consumer Portfolio Segment [Member] \| Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 113,172	$ 155,799

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) $ in Thousands	3 Months Ended		6 Months Ended
Loans and Leases (Narrative) (Detail) $ in Thousands	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Operating Leased Assets [Line Items]
Total operating lease liability payments	$ 176,831		$ 176,831
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	2,900	$ 3,800	6,100	$ 6,800
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ (300)	(1,900)	$ (2,200)	(3,100)
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| loan	0		0
Commercial Portfolio Segment [Member] \| Equipment financing
Operating Leased Assets [Line Items]
Net Investment in Direct Financing and Sales Type Leases	$ 222,300		$ 222,300		$ 236,100
Total operating lease liability payments	241,700		241,700
Sales-type and Direct Financing Leases, Interest Income	$ 1,900	$ 1,800	$ 3,800	$ 3,400

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 328,351	$ 334,931	$ 359,431	$ 209,096
(Benefit) provision	(21,574)	40,003	(47,333)	116,088
Charge-offs	(3,402)	(18,074)	(12,697)	(28,235)
Recoveries	4,570	1,662	8,544	4,005
Balance, end of period	307,945	358,522	307,945	358,522	$ 359,431
ALLL, Individually evaluated for impairment	16,097	19,755	16,097	19,755
ALLL, Collectively evaluated for impairment	291,848	338,767	291,848	338,767
Loan and lease balances, Individually evaluated for impairment	239,458	323,156	239,458	323,156
Loan and lease balances, Collectively evaluated for impairment	21,235,543	21,479,361	21,235,543	21,479,361
Loans and leases	21,475,001	21,802,517	21,475,001	21,802,517	21,641,215
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period			0	57,568
Balance, end of period					0
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	283,906	261,926	312,244	161,669
(Benefit) provision	(21,077)	44,605	(44,730)	115,848
Charge-offs	(594)	(15,294)	(6,915)	(20,868)
Recoveries	836	283	2,472	847
Balance, end of period	263,071	291,520	263,071	291,520	312,244
ALLL, Individually evaluated for impairment	11,537	15,271	11,537	15,271
ALLL, Collectively evaluated for impairment	251,534	276,249	251,534	276,249
Loan and lease balances, Individually evaluated for impairment	128,937	165,010	128,937	165,010
Loan and lease balances, Collectively evaluated for impairment	14,699,454	14,589,073	14,699,454	14,589,073
Loans and leases	14,828,391	14,754,083	14,828,391	14,754,083	14,900,535
Commercial Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period			0	34,024
Balance, end of period					0
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	44,445	73,005	47,187	47,427
(Benefit) provision	(497)	(4,602)	(2,603)	240
Charge-offs	(2,808)	(2,780)	(5,782)	(7,367)
Recoveries	3,734	1,379	6,072	3,158
Balance, end of period	44,874	67,002	44,874	67,002	47,187
ALLL, Individually evaluated for impairment	4,560	4,484	4,560	4,484
ALLL, Collectively evaluated for impairment	40,314	62,518	40,314	62,518
Loan and lease balances, Individually evaluated for impairment	110,521	158,146	110,521	158,146
Loan and lease balances, Collectively evaluated for impairment	6,536,089	6,890,288	6,536,089	6,890,288
Loans and leases	$ 6,646,610	$ 7,048,434	6,646,610	7,048,434	6,740,680
Consumer Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period			$ 0	$ 23,544
Balance, end of period					$ 0

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, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 25	$ 445
Financing Receivable, Nonaccrual	120,604	167,960	$ 167,960
Loans and leases	21,475,001	21,641,215	21,802,517
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	139,021	200,942
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	13,718	20,005
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	4,674	12,532
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	21,335,980	21,440,273
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	25	445
Financing Receivable, Nonaccrual	72,745	95,197	95,197
Loans and leases	14,828,391	14,900,535	14,754,083
Commercial Portfolio Segment [Member] \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	77,618	108,765
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	3,919	9,293
Commercial Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	929	3,830
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	14,750,773	14,791,770
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	25	445
Financing Receivable, Nonaccrual	49,513	64,073	64,073
Loans and leases	6,843,415	7,085,076
Commercial Portfolio Segment [Member] \| Commercial non-mortgage \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	50,682	66,033
Commercial Portfolio Segment [Member] \| Commercial non-mortgage \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	1,017	612
Commercial Portfolio Segment [Member] \| Commercial non-mortgage \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	127	903
Commercial Portfolio Segment [Member] \| Commercial non-mortgage \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	6,792,733	7,019,043
Commercial Portfolio Segment [Member] \| Asset-based
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	2,375	2,594	2,594
Loans and leases	943,961	890,598
Commercial Portfolio Segment [Member] \| Asset-based \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	2,375	3,768
Commercial Portfolio Segment [Member] \| Asset-based \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	0	1,174
Commercial Portfolio Segment [Member] \| Asset-based \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial Portfolio Segment [Member] \| Asset-based \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	941,586	886,830
Commercial Portfolio Segment [Member] \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	12,695	21,231	21,231
Loans and leases	6,410,672	6,322,637
Commercial Portfolio Segment [Member] \| Commercial real estate \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	14,383	24,250
Commercial Portfolio Segment [Member] \| Commercial real estate \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	1,324	2,400
Commercial Portfolio Segment [Member] \| Commercial real estate \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	364	619
Commercial Portfolio Segment [Member] \| Commercial real estate \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	6,396,289	6,298,387
Commercial Portfolio Segment [Member] \| Equipment financing
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	8,162	7,299	7,299
Loans and leases	630,343	602,224
Commercial Portfolio Segment [Member] \| Equipment financing \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	10,178	14,714
Commercial Portfolio Segment [Member] \| Equipment financing \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	1,578	5,107
Commercial Portfolio Segment [Member] \| Equipment financing \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	438	2,308
Commercial Portfolio Segment [Member] \| Equipment financing \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	620,165	587,510
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	47,859	72,763	72,763
Loans and leases	6,646,610	6,740,680	7,048,434
Consumer Portfolio Segment [Member] \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	61,403	92,177
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	9,799	10,712
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	3,745	8,702
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	6,585,207	6,648,503
Consumer Portfolio Segment [Member] \| Residential
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	21,472	41,081	41,081
Loans and leases	4,856,302	4,782,016
Consumer Portfolio Segment [Member] \| Residential \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	26,168	51,745
Consumer Portfolio Segment [Member] \| Residential \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	3,891	4,334
Consumer Portfolio Segment [Member] \| Residential \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	805	6,330
Consumer Portfolio Segment [Member] \| Residential \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	4,830,134	4,730,271
Consumer Portfolio Segment [Member] \| Home equity
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	25,975	31,030	$ 31,030
Loans and leases	1,677,136	1,802,865
Consumer Portfolio Segment [Member] \| Home equity \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	34,008	38,301
Consumer Portfolio Segment [Member] \| Home equity \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	5,429	5,500
Consumer Portfolio Segment [Member] \| Home equity \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	2,604	1,771
Consumer Portfolio Segment [Member] \| Home equity \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	1,643,128	1,764,564
Consumer Portfolio Segment [Member] \| Other consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financing Receivable, Nonaccrual	412	652
Loans and leases	113,172	155,799
Consumer Portfolio Segment [Member] \| Other consumer \| Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	1,227	2,131
Consumer Portfolio Segment [Member] \| Other consumer \| Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	479	878
Consumer Portfolio Segment [Member] \| Other consumer \| Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	336	601
Consumer Portfolio Segment [Member] \| Other consumer \| Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 111,945	$ 153,668

Loans and Leases Nonaccrual (De

Loans and Leases Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	$ 120,604	$ 167,960	$ 167,960
Financing Receivable, Nonaccrual, No Allowance	47,159		89,433
Commercial Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	72,745	95,197	95,197
Financing Receivable, Nonaccrual, No Allowance	13,853		35,497
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	49,513	64,073	64,073
Financing Receivable, Nonaccrual, No Allowance	8,386		16,985
Commercial Portfolio Segment [Member] \| Asset-based
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	2,375	2,594	2,594
Financing Receivable, Nonaccrual, No Allowance	2,375		0
Commercial Portfolio Segment [Member] \| Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	12,695	21,231	21,231
Financing Receivable, Nonaccrual, No Allowance	554		15,529
Commercial Portfolio Segment [Member] \| Equipment financing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	8,162	7,299	7,299
Financing Receivable, Nonaccrual, No Allowance	2,538		2,983
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	47,859	72,763	72,763
Financing Receivable, Nonaccrual, No Allowance	33,306		53,936
Consumer Portfolio Segment [Member] \| Residential
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	21,472	41,081	41,081
Financing Receivable, Nonaccrual, No Allowance	12,680		29,843
Consumer Portfolio Segment [Member] \| Home equity
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	25,975	$ 31,030	31,030
Financing Receivable, Nonaccrual, No Allowance	20,620		24,091
Consumer Portfolio Segment [Member] \| Other consumer
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	412		652
Financing Receivable, Nonaccrual, No Allowance	$ 6		$ 2

Loans and Leases (Credit Qualit

Loans and Leases (Credit Quality Indicators) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 2,963,164	$ 5,461,818
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,133,110	3,635,131
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,210,467	2,728,575
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,329,450	1,645,809
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,342,602	1,487,739
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,228,084	3,453,866
Financing Receivable, Revolving	3,268,124	3,228,277
Loans and leases	21,475,001	21,641,215	$ 21,802,517
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,964,149	4,116,181
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,896,187	2,781,504
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,601,649	2,475,137
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,144,175	1,198,615
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,005,013	909,133
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,241,731	1,584,568
Financing Receivable, Revolving	1,975,487	1,835,397
Loans and leases	14,828,391	14,900,535	14,754,083
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,380,128	2,858,624
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,710,723	1,137,847
Financing Receivable, Originated Two Years before Latest Fiscal Year	990,735	1,035,468
Financing Receivable, Originated Three Years before Latest Fiscal Year	828,469	518,078
Financing Receivable, Originated Four Years before Latest Fiscal Year	387,616	255,172
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	438,361	255,715
Financing Receivable, Revolving	1,107,383	1,024,172
Loans and leases	6,843,415	7,085,076
Commercial Portfolio Segment [Member] \| Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,744	26,344
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27,329	18,464
Financing Receivable, Originated Two Years before Latest Fiscal Year	17,502	23,898
Financing Receivable, Originated Three Years before Latest Fiscal Year	20,265	11,333
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,431	10,963
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	25,584	16,484
Financing Receivable, Revolving	843,106	783,112
Loans and leases	943,961	890,598
Commercial Portfolio Segment [Member] \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	448,064	966,426
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	928,613	1,472,718
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,461,066	1,334,949
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,231,579	639,091
Financing Receivable, Originated Four Years before Latest Fiscal Year	589,319	593,209
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,727,033	1,288,131
Financing Receivable, Revolving	24,998	28,113
Loans and leases	6,410,672	6,322,637
Commercial Portfolio Segment [Member] \| Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	132,213	264,787
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	229,522	152,475
Financing Receivable, Originated Two Years before Latest Fiscal Year	132,346	80,822
Financing Receivable, Originated Three Years before Latest Fiscal Year	63,862	30,113
Financing Receivable, Originated Four Years before Latest Fiscal Year	21,647	49,789
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	50,753	24,238
Financing Receivable, Revolving	0	0
Loans and leases	630,343	602,224
Commercial Portfolio Segment [Member] \| (1) - (6) Pass [Member] \| Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,380,022	2,771,373
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,635,700	1,052,080
Financing Receivable, Originated Two Years before Latest Fiscal Year	921,484	907,110
Financing Receivable, Originated Three Years before Latest Fiscal Year	705,932	481,321
Financing Receivable, Originated Four Years before Latest Fiscal Year	363,486	231,280
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	398,483	218,001
Financing Receivable, Revolving	1,068,452	936,592
Loans and leases	6,473,559	6,597,757
Commercial Portfolio Segment [Member] \| (1) - (6) Pass [Member] \| Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,744	26,344
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27,329	15,960
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,127	23,123
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,540	11,333
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,431	10,963
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	25,584	16,484
Financing Receivable, Revolving	779,349	741,336
Loans and leases	877,104	845,543
Commercial Portfolio Segment [Member] \| (1) - (6) Pass [Member] \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	447,624	965,582
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	925,584	1,461,201
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,451,104	1,242,322
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,130,513	527,931
Financing Receivable, Originated Four Years before Latest Fiscal Year	491,810	554,630
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,565,554	1,165,331
Financing Receivable, Revolving	24,998	28,113
Loans and leases	6,037,187	5,945,110
Commercial Portfolio Segment [Member] \| (1) - (6) Pass [Member] \| Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	132,213	249,370
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	219,007	135,263
Financing Receivable, Originated Two Years before Latest Fiscal Year	123,041	68,092
Financing Receivable, Originated Three Years before Latest Fiscal Year	57,096	26,433
Financing Receivable, Originated Four Years before Latest Fiscal Year	19,368	43,469
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47,107	22,879
Financing Receivable, Revolving	0	0
Loans and leases	597,832	545,506
Commercial Portfolio Segment [Member] \| (7) Special Mention [Member] \| Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	32,535
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,973	33,969
Financing Receivable, Originated Two Years before Latest Fiscal Year	48,957	62,034
Financing Receivable, Originated Three Years before Latest Fiscal Year	56,527	435
Financing Receivable, Originated Four Years before Latest Fiscal Year	119	8,357
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	16,621	13,757
Financing Receivable, Revolving	13,134	38,496
Loans and leases	144,331	189,583
Commercial Portfolio Segment [Member] \| (7) Special Mention [Member] \| Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	775
Financing Receivable, Originated Three Years before Latest Fiscal Year	725	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	63,757	41,687
Loans and leases	64,482	42,462
Commercial Portfolio Segment [Member] \| (7) Special Mention [Member] \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	440	27
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,221	10,385
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,182	70,704
Financing Receivable, Originated Three Years before Latest Fiscal Year	79,499	37,539
Financing Receivable, Originated Four Years before Latest Fiscal Year	54,481	35,617
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	113,566	69,832
Financing Receivable, Revolving	0	0
Loans and leases	259,389	224,104
Commercial Portfolio Segment [Member] \| (7) Special Mention [Member] \| Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	7,934
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	885	11,043
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,362	6,981
Financing Receivable, Originated Three Years before Latest Fiscal Year	64	1,220
Financing Receivable, Originated Four Years before Latest Fiscal Year	99	1,577
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,165	788
Financing Receivable, Revolving	0	0
Loans and leases	6,575	29,543
Commercial Portfolio Segment [Member] \| (8) Substandard [Member] \| Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	106	54,716
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	66,050	51,798
Financing Receivable, Originated Two Years before Latest Fiscal Year	20,294	66,324
Financing Receivable, Originated Three Years before Latest Fiscal Year	66,010	36,159
Financing Receivable, Originated Four Years before Latest Fiscal Year	24,011	15,535
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	23,257	23,957
Financing Receivable, Revolving	25,797	49,084
Loans and leases	225,525	297,573
Commercial Portfolio Segment [Member] \| (8) Substandard [Member] \| Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	2,504
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,375	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	89
Loans and leases	2,375	2,593
Commercial Portfolio Segment [Member] \| (8) Substandard [Member] \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	817
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	808	1,132
Financing Receivable, Originated Two Years before Latest Fiscal Year	780	21,923
Financing Receivable, Originated Three Years before Latest Fiscal Year	21,567	73,621
Financing Receivable, Originated Four Years before Latest Fiscal Year	43,028	2,962
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47,913	52,968
Financing Receivable, Revolving	0	0
Loans and leases	114,096	153,423
Commercial Portfolio Segment [Member] \| (8) Substandard [Member] \| Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	7,483
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9,630	6,169
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,943	5,749
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,702	2,460
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,180	4,743
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,481	571
Financing Receivable, Revolving	0	0
Loans and leases	25,936	27,175
Commercial Portfolio Segment [Member] \| (9) Doubtful [Member] \| Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		163
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		0
Financing Receivable, Revolving		0
Loans and leases		163
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	999,015	1,345,637
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,236,923	853,627
Financing Receivable, Originated Two Years before Latest Fiscal Year	608,818	253,438
Financing Receivable, Originated Three Years before Latest Fiscal Year	185,275	447,194
Financing Receivable, Originated Four Years before Latest Fiscal Year	337,589	578,606
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,986,353	1,869,298
Financing Receivable, Revolving	1,292,637	1,392,880
Loans and leases	6,646,610	6,740,680	$ 7,048,434
Consumer Portfolio Segment [Member] \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	949,493	1,231,789
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,140,673	746,435
Financing Receivable, Originated Two Years before Latest Fiscal Year	531,852	167,979
Financing Receivable, Originated Three Years before Latest Fiscal Year	122,659	402,761
Financing Receivable, Originated Four Years before Latest Fiscal Year	302,058	536,400
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,809,567	1,696,652
Financing Receivable, Revolving	0	0
Loans and leases	4,856,302	4,782,016
Consumer Portfolio Segment [Member] \| Residential \| 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	216,867	360,336
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	443,796	283,755
Financing Receivable, Originated Two Years before Latest Fiscal Year	189,777	61,048
Financing Receivable, Originated Three Years before Latest Fiscal Year	41,846	178,849
Financing Receivable, Originated Four Years before Latest Fiscal Year	140,310	268,044
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	871,273	805,537
Financing Receivable, Revolving	0	0
Loans and leases	1,903,869	1,957,569
Consumer Portfolio Segment [Member] \| Residential \| 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	529,874	654,973
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	526,584	288,173
Financing Receivable, Originated Two Years before Latest Fiscal Year	210,767	58,249
Financing Receivable, Originated Three Years before Latest Fiscal Year	49,417	133,416
Financing Receivable, Originated Four Years before Latest Fiscal Year	100,206	176,286
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	550,153	492,720
Financing Receivable, Revolving	0	0
Loans and leases	1,967,001	1,803,817
Consumer Portfolio Segment [Member] \| Residential \| 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	187,435	199,329
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	158,404	118,620
Financing Receivable, Originated Two Years before Latest Fiscal Year	85,483	39,125
Financing Receivable, Originated Three Years before Latest Fiscal Year	24,678	75,375
Financing Receivable, Originated Four Years before Latest Fiscal Year	49,323	76,666
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	265,179	248,268
Financing Receivable, Revolving	0	0
Loans and leases	770,502	757,383
Consumer Portfolio Segment [Member] \| Residential \| 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	15,047	17,151
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,478	19,389
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,213	8,884
Financing Receivable, Originated Three Years before Latest Fiscal Year	4,887	11,843
Financing Receivable, Originated Four Years before Latest Fiscal Year	11,003	12,225
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	86,098	96,333
Financing Receivable, Revolving	0	0
Loans and leases	136,726	165,825
Consumer Portfolio Segment [Member] \| Residential \| 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	270	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	411	36,498
Financing Receivable, Originated Two Years before Latest Fiscal Year	37,612	673
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,831	3,278
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,216	3,179
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	36,864	53,794
Financing Receivable, Revolving	0	0
Loans and leases	78,204	97,422
Consumer Portfolio Segment [Member] \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	46,580	80,991
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	72,859	42,078
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,250	59,221
Financing Receivable, Originated Three Years before Latest Fiscal Year	47,692	39,022
Financing Receivable, Originated Four Years before Latest Fiscal Year	32,444	40,738
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	175,585	171,626
Financing Receivable, Revolving	1,268,726	1,369,189
Loans and leases	1,677,136	1,802,865
Consumer Portfolio Segment [Member] \| Home equity \| 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	16,759	30,604
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32,346	16,567
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,233	25,205
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,613	14,439
Financing Receivable, Originated Four Years before Latest Fiscal Year	13,742	17,192
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	66,580	59,956
Financing Receivable, Revolving	516,121	542,600
Loans and leases	677,394	706,563
Consumer Portfolio Segment [Member] \| Home equity \| 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	22,141	34,797
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27,472	13,565
Financing Receivable, Originated Two Years before Latest Fiscal Year	10,892	19,715
Financing Receivable, Originated Three Years before Latest Fiscal Year	15,092	11,073
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,752	12,839
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	43,852	43,802
Financing Receivable, Revolving	414,822	434,271
Loans and leases	543,023	570,062
Consumer Portfolio Segment [Member] \| Home equity \| 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	7,528	13,753
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,250	8,855
Financing Receivable, Originated Two Years before Latest Fiscal Year	7,484	10,761
Financing Receivable, Originated Three Years before Latest Fiscal Year	10,464	10,206
Financing Receivable, Originated Four Years before Latest Fiscal Year	7,055	7,318
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	42,004	44,025
Financing Receivable, Revolving	239,265	275,691
Loans and leases	325,050	370,609
Consumer Portfolio Segment [Member] \| Home equity \| 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	42	1,708
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,426	2,172
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,923	2,660
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,539	2,234
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,527	2,316
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	16,935	16,680
Financing Receivable, Revolving	71,886	86,126
Loans and leases	96,278	113,896
Consumer Portfolio Segment [Member] \| Home equity \| 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	110	129
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	365	919
Financing Receivable, Originated Two Years before Latest Fiscal Year	718	880
Financing Receivable, Originated Three Years before Latest Fiscal Year	984	1,070
Financing Receivable, Originated Four Years before Latest Fiscal Year	368	1,073
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,214	7,163
Financing Receivable, Revolving	26,632	30,501
Loans and leases	35,391	41,735
Consumer Portfolio Segment [Member] \| Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,942	32,857
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	23,391	65,114
Financing Receivable, Originated Two Years before Latest Fiscal Year	43,716	26,238
Financing Receivable, Originated Three Years before Latest Fiscal Year	14,924	5,411
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,087	1,468
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,201	1,020
Financing Receivable, Revolving	23,911	23,691
Loans and leases	113,172	155,799
Consumer Portfolio Segment [Member] \| Consumer Loan \| 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	287	2,827
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,912	5,725
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,131	2,610
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,542	658
Financing Receivable, Originated Four Years before Latest Fiscal Year	436	115
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	139	190
Financing Receivable, Revolving	6,735	7,171
Loans and leases	15,182	19,296
Consumer Portfolio Segment [Member] \| Consumer Loan \| 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	354	12,317
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,355	21,036
Financing Receivable, Originated Two Years before Latest Fiscal Year	13,497	8,925
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,221	1,493
Financing Receivable, Originated Four Years before Latest Fiscal Year	766	457
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	394	263
Financing Receivable, Revolving	8,145	5,119
Loans and leases	36,732	49,610
Consumer Portfolio Segment [Member] \| Consumer Loan \| 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,094	14,761
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,331	31,952
Financing Receivable, Originated Two Years before Latest Fiscal Year	21,734	11,843
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,653	2,284
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,312	665
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	362	228
Financing Receivable, Revolving	6,554	8,403
Loans and leases	50,040	70,136
Consumer Portfolio Segment [Member] \| Consumer Loan \| 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	114	2,344
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,604	5,419
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,060	2,360
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,267	793
Financing Receivable, Originated Four Years before Latest Fiscal Year	490	194
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	259	124
Financing Receivable, Revolving	1,337	1,570
Loans and leases	9,131	12,804
Consumer Portfolio Segment [Member] \| Consumer Loan \| 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	93	608
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	189	982
Financing Receivable, Originated Two Years before Latest Fiscal Year	294	500
Financing Receivable, Originated Three Years before Latest Fiscal Year	241	183
Financing Receivable, Originated Four Years before Latest Fiscal Year	83	37
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47	215
Financing Receivable, Revolving	1,140	1,428
Loans and leases	$ 2,087	$ 3,953

Loans and Leases (Impaired Loan

Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 278,117
Amortized Cost	239,458	$ 309,422
Amortized Cost No Allowance	122,438
Amortized Cost With Allowance	117,020
Related Allowance	16,097
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	122,891	172,069
Amortized Cost	97,270	119,884
Amortized Cost No Allowance	43,936	55,742
Amortized Cost With Allowance	53,334	64,142
Related Allowance	8,488	9,665
Commercial Portfolio Segment [Member] \| Asset-based
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,499	2,989
Amortized Cost	2,375	2,594
Amortized Cost No Allowance	2,375	0
Amortized Cost With Allowance	0	2,594
Related Allowance	0	50
Commercial Portfolio Segment [Member] \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	24,581	37,177
Amortized Cost	21,130	33,879
Amortized Cost No Allowance	7,329	25,931
Amortized Cost With Allowance	13,801	7,948
Related Allowance	1,808	1,610
Commercial Portfolio Segment [Member] \| Equipment financing
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	8,621	7,770
Amortized Cost	8,162	7,298
Amortized Cost No Allowance	2,538	2,983
Amortized Cost With Allowance	5,624	4,315
Related Allowance	1,241	362
Commercial Portfolio Segment [Member] \| Residential
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		108,077
Amortized Cost		98,164
Amortized Cost No Allowance		58,915
Amortized Cost With Allowance		39,249
Related Allowance		3,357
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		439,619
Amortized Cost		309,422
Amortized Cost No Allowance		177,908
Amortized Cost With Allowance		131,514
Related Allowance		16,137
Consumer Portfolio Segment [Member] \| Residential
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	72,749
Amortized Cost	68,823	98,164
Amortized Cost No Allowance	36,092
Amortized Cost With Allowance	32,731
Related Allowance	2,770
Consumer Portfolio Segment [Member] \| Home equity
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	46,364	109,156
Amortized Cost	41,286	46,950
Amortized Cost No Allowance	30,162	34,335
Amortized Cost With Allowance	11,124	12,615
Related Allowance	1,668	988
Consumer Portfolio Segment [Member] \| Consumer Loan
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	412	2,381
Amortized Cost	412	653
Amortized Cost No Allowance	6	2
Amortized Cost With Allowance	406	651
Related Allowance	$ 122	$ 105

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 264,336	$ 344,193	$ 274,442	$ 306,344
Accrued Interest Income	1,672	2,134	3,574	4,571
Cash Basis Interest Income	470	643	957	2,103
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	105,811	136,483	108,577	115,903
Accrued Interest Income	682	875	1,541	1,928
Cash Basis Interest Income	0	0	0	0
Commercial Portfolio Segment [Member] \| Asset-based
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,389	138	2,485	139
Accrued Interest Income	0	0	0	0
Cash Basis Interest Income	0	0	0	0
Commercial Portfolio Segment [Member] \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	23,721	26,017	27,505	25,411
Accrued Interest Income	126	169	308	315
Cash Basis Interest Income	0	0	0	0
Commercial Portfolio Segment [Member] \| Equipment financing
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	7,121	8,373	7,730	6,613
Accrued Interest Income	0	0	0	0
Cash Basis Interest Income	0	0	0	0
Consumer Portfolio Segment [Member] \| Residential
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	80,670	121,488	83,494	113,806
Accrued Interest Income	577	781	1,216	1,611
Cash Basis Interest Income	168	230	441	860
Consumer Portfolio Segment [Member] \| Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	44,120	50,573	44,118	43,863
Accrued Interest Income	287	309	509	700
Cash Basis Interest Income	302	413	516	1,243
Consumer Portfolio Segment [Member] \| Consumer Loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	504	1,121	533	609
Accrued Interest Income	0	0	0	17
Cash Basis Interest Income	$ 0	$ 0	$ 0	$ 0

Loans and Leases Impaired Colla

Loans and Leases Impaired Collateral (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 239,458	$ 309,422
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	78,612	102,836
Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	160,846	206,586
Collateral Value
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	107,000	150,300
Commercial Portfolio Segment [Member] \| Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	97,270	119,884
Commercial Portfolio Segment [Member] \| Commercial non-mortgage \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	18,496	11,074
Commercial Portfolio Segment [Member] \| Commercial non-mortgage \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	78,774	108,810
Commercial Portfolio Segment [Member] \| Asset-based
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,375	2,594
Commercial Portfolio Segment [Member] \| Asset-based \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,375	2,504
Commercial Portfolio Segment [Member] \| Asset-based \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	90
Commercial Portfolio Segment [Member] \| Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	21,130	33,879
Commercial Portfolio Segment [Member] \| Commercial real estate \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	17,598	28,482
Commercial Portfolio Segment [Member] \| Commercial real estate \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	3,532	5,397
Commercial Portfolio Segment [Member] \| Equipment financing
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,162	7,298
Commercial Portfolio Segment [Member] \| Equipment financing \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Commercial Portfolio Segment [Member] \| Equipment financing \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,162	7,298
Commercial Portfolio Segment [Member] \| Residential
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		98,164
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		309,422
Consumer Portfolio Segment [Member] \| Residential
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	68,823	98,164
Consumer Portfolio Segment [Member] \| Residential \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	17,649	33,980
Consumer Portfolio Segment [Member] \| Residential \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	51,174	64,184
Consumer Portfolio Segment [Member] \| Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	41,286	46,950
Consumer Portfolio Segment [Member] \| Home equity \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	22,494	26,796
Consumer Portfolio Segment [Member] \| Home equity \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	18,792	20,154
Consumer Portfolio Segment [Member] \| Consumer Loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	412	653
Consumer Portfolio Segment [Member] \| Consumer Loan \| Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Consumer Portfolio Segment [Member] \| Consumer Loan \| Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 412	$ 653

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 184,343		$ 235,427
Specific reserves for TDRs included in the balance of ACL on loans and leases	307,945	$ 328,351	359,431	$ 358,522	$ 334,931	$ 209,096
Additional funds committed to borrowers in TDR status	13,512		12,895
Performing Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	119,707		140,089
Nonperforming Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	64,636		95,338
Nonperforming Financial Instruments [Member] \| Troubled Debt Restructures [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDRs included in the balance of ACL on loans and leases	$ 11,726		$ 12,728

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, 2021USD ($)loan	Jun. 30, 2020USD ($)loan	Jun. 30, 2021USD ($)loan	Jun. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	17	103	43	140
Post-Modification Recorded Investment \| $	$ 1,174	$ 21,420	$ 3,818	$ 51,659
Commercial Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	1	5	8	7
Post-Modification Recorded Investment \| $	$ 50	$ 475	$ 740	$ 579
Commercial Portfolio Segment [Member] \| Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	5	0	6	6
Post-Modification Recorded Investment \| $	$ 173	$ 0	$ 210	$ 552
Commercial Portfolio Segment [Member] \| Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	1	13	3	23
Post-Modification Recorded Investment \| $	$ 1	$ 12,985	$ 114	$ 40,122
Consumer Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	0	3	2	4
Post-Modification Recorded Investment \| $	$ 0	$ 244	$ 127	$ 508
Consumer Portfolio Segment [Member] \| Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	3	2	8	6
Post-Modification Recorded Investment \| $	$ 415	$ 255	$ 1,426	$ 711
Consumer Portfolio Segment [Member] \| Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan	7	80	16	94
Post-Modification Recorded Investment \| $	$ 535	$ 7,461	$ 1,201	$ 9,187

Loans and Leases (Investments i

Loans and Leases (Investments in TDRs, Segregated by Risk Rating Exposure) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 184,343	$ 235,427
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	90,406	117,695
Commercial Portfolio Segment [Member] \| (1) - (6) Pass [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	8,740	12,462
Commercial Portfolio Segment [Member] \| (7) Special Mention [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	8,670	0
Commercial Portfolio Segment [Member] \| (8) Substandard [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	72,996	105,070
Commercial Portfolio Segment [Member] \| (9) Doubtful [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 0	$ 163

Transfers of Financial Assets_2

Transfers of Financial Assets (Reserve for loan repurchases) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Beginning balance			$ 747	$ 508
Provision charged to expense			43	49
(Charge-offs/settlements) recoveries, net			(8)	98
Ending balance	$ 782	$ 655	$ 782	$ 655
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Beginning balance	770	633
Provision charged to expense	20	27
(Charge-offs/settlements) recoveries, net	$ (8)	$ (5)

Transfers of Financial Assets_3

Transfers of Financial Assets (Loans sold) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale	$ 1,319	$ 4,205	$ 3,961	$ 7,098
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ancillary fees	377	824	918	1,225
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans Servicing Retained [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	66,087	89,687	141,778	161,778
Consumer Portfolio Segment [Member] \| Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	68,427	94,574	147,735	170,168
Net gain on sale	1,351	2,824	3,460	5,343
Fair value option adjustment	$ (409)	$ 557	$ (417)	$ 530

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds of Other Loans and Leases Held-for-investment			$ 49,122	$ 3,606
Mortgage banking activities	$ 1,319	$ 4,205	3,961	7,098
Retained servicing rights					$ 2,300,000
Residential
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds of Other Loans and Leases Held-for-investment			49,100
Commercial Loan [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds of Other Loans and Leases Held-for-investment				3,600
Mortgage banking activities			718	256
Consumer Portfolio Segment [Member] \| Residential
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Mortgage banking activities	1,351	2,824	3,460	5,343
Retained servicing rights	2,200,000		2,200,000		$ 2,200,000
Contractually Specified Servicing Fees, Amount	$ 200	$ 300	$ 600	$ 800

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning Balance	$ 12,327	$ 16,391	$ 13,422	$ 17,484
Additions	616	779	1,202	1,968
Amortization	(1,442)	(1,669)	(2,932)	(3,376)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	0	(575)	(191)	(1,150)
Ending Balance	$ 11,501	$ 14,926	$ 11,501	$ 14,926

Leases Lessee Accounting (Detai

Leases Lessee Accounting (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 126,145
Less: Present value adjustment	$ 154,461	$ 158,280

Leases Lessee Cost (Details)

Leases Lessee Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases Lessee Cost (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease, Cost [Abstract]
Operating lease costs	$ 6,554	$ 7,407	$ 13,111	$ 14,831
Variable lease costs	1,351	1,493	2,651	2,920
Sublease income	(140)	(142)	(271)	(287)
Total operating lease cost	7,765	8,758	15,491	17,464
Cash paid for amounts included in the measurement of lease liabilities	7,672	7,778	15,505	15,536
ROU lease assets obtained in exchange for new operating lease liabilities	$ 4,160	$ 30	$ 9,558	$ 8,696
Weighted-average remaining lease term, in years	7 years 9 months 25 days		7 years 9 months 25 days
Weighted-average discount rate	3.10%		3.10%

Leases Operating Lease Liabilit

Leases Operating Lease Liabilities, Payments, Due, Rolling Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Remainder of 2021	$ 12,611
2022	28,144
2023	25,900
2024	23,120
2025	21,154
Thereafter	65,902
Total operating lease liability payments	176,831
Less: Present value adjustment	154,461	$ 158,280
Lease liabilities	$ 22,370

Leases (Details)

Leases (Details)	Jun. 30, 2021
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

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, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 47,625	$ 47,625
Accumulated Amortization	27,513	25,242
Net Carrying Amount	20,112	22,383
Core Deposits [Member] \| HSA Bank
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,625	26,625
Accumulated Amortization	17,080	15,618
Net Carrying Amount	9,545	11,007
Customer Relationships [Member] \| HSA Bank
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,000	21,000
Accumulated Amortization	10,433	9,624
Net Carrying Amount	$ 10,567	$ 11,376

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Jun. 30, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 2,242
2022	4,411
2023	4,315
2024	2,084
2025	2,084
Thereafter	$ 4,976

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Non-interest-bearing:
Demand	$ 6,751,373	$ 6,155,592
Interest-bearing:
HSA	7,323,421	7,120,017
Checking	3,843,725	3,652,763
Money market	3,442,319	2,940,215
Savings	5,471,584	4,979,031
Time deposits	2,014,544	2,487,818
Total interest-bearing	22,095,593	21,179,844
Total deposits	28,846,966	27,335,436
Time deposits and interest-bearing checking obtained through brokers (included in above balances)	112,732	720,440
Time deposits that exceed the FDIC limit (included in above balance)	337,866	504,543
Deposit overdrafts reclassified as loan balances	$ 1,050	$ 2,007

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deposit Liabilities [Abstract]
Remainder of 2021	$ 1,253,018
2022	566,946
2023	91,793
2024	39,125
2025	50,983
Thereafter	12,679
Time deposits	$ 2,014,544	$ 2,487,818

Borrowings Borrowings - (Narrat

Borrowings Borrowings - (Narrative) (Details) - USD ($) $ in Billions	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Total Outstanding	$ 1.2	$ 1.7

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 1,200,000	$ 1,700,000
Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 507,124	$ 469,330
Rate	0.65%	0.43%
Fed funds purchased
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 0	$ 526,025
Rate	0.00%	0.08%
Securities sold under agreements to repurchase and other borrowings
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 507,124	$ 995,355
Rate	0.65%	0.25%
Original maturity of one year or less \| Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 307,124	$ 269,330
Rate	0.11%	0.13%
Original maturity of greater than one year, non-callable \| Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 200,000	$ 200,000
Rate	1.47%	0.84%

Borrowings Borrowings (Summary

Borrowings Borrowings (Summary Of Advances Payable To the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Total Outstanding	$ 25,000	$ 25,000
FHLB advances maturing after 1 but within 2 years, Total Outstanding	100	110
FHLB advances maturing after 2 but within 3 years, Total Outstanding	208	215
FHLB advances maturing after 3 but within 4 years, Total Outstanding	100,000	50,000
FHLB advances maturing after 4 but within 5 years, Total Outstanding	0	50,000
FHLB advances maturing after 5 years, Total Outstanding	13,136	7,839
Federal Home Loan Bank, Advances	$ 138,444	$ 133,164
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]
FHLB advances maturing within 1 year, Weighted Average Contractual Coupon Rate (as a percent)	0.33%	0.38%
FHLB advances maturing after 1 but within 2 years, Weighted Average Contractual Coupon Rate (as a percent)	0.00%	0.00%
FHLB advances maturing after 2 but within 3 years, Weighted Average Contractual Coupon Rate (as a percent)	2.95%	2.95%
FHLB advances maturing after 3 but within 4 years, Weighted Average Contractual Coupon Rate (as a percent)	1.50%	1.59%
FHLB advances maturing after 4 but within 5 years, Weighted Average Contractual Coupon Rate (as a percent)	0.00%	1.42%
FHLB advances maturing after 5 years, Weighted Average Contractual Coupon Rate (as a percent)	2.56%	2.66%
Federal Home Loan Bank, Advances, Weighted Average Contractual Coupon Rate (as a percent)	1.39%	1.36%
Aggregate carrying value of assets pledged as collateral	$ 7,004,625	$ 7,387,054
Remaining borrowing capacity	$ 4,528,972	$ 4,689,642

Borrowings (Long Term Debt) (De

Borrowings (Long Term Debt) (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Notes and subordinated debt	$ 568,808,000	$ 571,484,000
Debt issuance cost on senior fixed-rates	(2,427,000)	(2,628,000)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	341,488,000	344,164,000
Long-term debt	$ 565,297,000	$ 567,663,000
Variable interest rate	3.07%	3.18%
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	$ (1,084,000)	$ (1,193,000)
Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 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	$ 341,488,000	344,164,000
Long-term Debt [Member]
Debt Instrument [Line Items]
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 41,488,000	$ 44,164,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 3,272,928	$ 3,090,242	$ 3,234,625	$ 3,207,770
Net current-period other comprehensive (loss) income, net of tax	(2,384)	66,245	(36,366)	77,517
Ending Balance	3,329,705	3,174,779	3,329,705	3,174,779
Available For Sale and Transferred Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	37,071	1,562	67,424	17,251
Other comprehensive (loss) before reclassifications	(1,473)	61,914	(31,826)	46,231
Amounts reclassified from accumulated other comprehensive (loss)	0	0	0	(6)
Net current-period other comprehensive (loss) income, net of tax	(1,473)	61,914	(31,826)	46,225
Ending Balance	35,598	63,476	35,598	63,476
Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	15,546	17,048	19,918	(9,184)
Other comprehensive (loss) before reclassifications	(2,475)	2,186	(7,645)	26,965
Amounts reclassified from accumulated other comprehensive (loss)	823	1,415	1,621	2,868
Net current-period other comprehensive (loss) income, net of tax	(1,652)	3,601	(6,024)	29,833
Ending Balance	13,894	20,649	13,894	20,649
Defined Benefit Pension and Other Postretirement Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(44,343)	(43,410)	(45,086)	(44,139)
Other comprehensive (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss)	741	730	1,484	1,459
Net current-period other comprehensive (loss) income, net of tax	741	730	1,484	1,459
Ending Balance	(43,602)	(42,680)	(43,602)	(42,680)
Accumulated Other Comprehensive (Loss), Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	8,274	(24,800)	42,256	(36,072)
Other comprehensive (loss) before reclassifications	(3,948)	64,100	(39,471)	73,196
Amounts reclassified from accumulated other comprehensive (loss)	1,564	2,145	3,105	4,321
Net current-period other comprehensive (loss) income, net of tax	(2,384)	66,245	(36,366)	77,517
Ending Balance	$ 5,890	$ 41,445	$ 5,890	$ 41,445

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (33,991)	$ (14,802)	$ (64,202)	$ (25,946)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0		0	(2)
Net of tax	0	0	0	6
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] \| Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Debt Securities, Available-for-sale, Gain (Loss)	0	0	0	8
Income tax expense		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	(823)	(1,415)	(1,621)	(2,868)
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]
Income tax expense	291	501	574	1,015
Net of tax	(823)	(1,415)	(1,621)	(2,868)
Other Nonoperating Expense	(1,037)	(1,088)	(2,042)	(2,261)
Interest Income, Other	(77)	(828)	(153)	(1,622)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1,007)	(990)	(2,015)	(1,980)
Defined benefit pension and postretirement benefit plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(741)	(730)	(1,484)	(1,459)
Income tax expense	$ 266	$ 260	$ 531	$ 521

Regulatory Matters (Information

Regulatory Matters (Information On The Capital Ratios) (Detail)	6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 2,664,879,000		$ 2,543,131,000
Common Equity Tier One Capital Ratio	0.1166		0.1135
Common Equity Tier One Capital Required for Capital Adequacy	$ 1,028,123,000		$ 1,008,512,000
Common Equity Tier One Capital Required to be Well-Capitalized	1,485,067,000		1,456,739,000
Total risk-based capital, Actual Amount	$ 3,130,000,000		$ 3,045,652,000
Total risk-based capital, Actual Ratio	0.1370		0.1359
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,827,774,000		$ 1,792,910,000
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080		0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 2,284,718,000		$ 2,241,137,000
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100
Tier 1 capital, Actual Amount	$ 2,809,916,000		$ 2,688,168,000
Tier 1 capital, Actual Ratio	0.1230		0.1199
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,370,831,000		$ 1,344,682,000
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,827,774,000		$ 1,792,910,000
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 2,809,916,000		$ 2,688,168,000
Tier 1 leverage capital ratio, Actual Ratio	0.0853		0.0832
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 1,317,538,000		$ 1,291,980,000
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	0.040		0.040
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 1,646,923,000		$ 1,614,975,000
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		0.050
Dividends paid	$ 120,000,000	$ 0
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 2,897,545,000		$ 2,791,474,000
Common Equity Tier One Capital Ratio	0.1269		0.1246
Common Equity Tier One Capital Required for Capital Adequacy	$ 1,027,620,000		$ 1,008,027,000
Common Equity Tier One Capital Required to be Well-Capitalized	1,484,340,000		1,456,039,000
Total risk-based capital, Actual Amount	$ 3,140,309,000		$ 3,071,505,000
Total risk-based capital, Actual Ratio	0.1375		0.1371
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,826,881,000		$ 1,792,048,000
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080		0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 2,283,601,000		$ 2,240,060,000
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100
Tier 1 capital, Actual Amount	$ 2,897,545,000		$ 2,791,474,000
Tier 1 capital, Actual Ratio	0.1269		0.1246
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,370,160,000		$ 1,344,036,000
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,826,881,000		$ 1,792,048,000
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 2,897,545,000		$ 2,791,474,000
Tier 1 leverage capital ratio, Actual Ratio	0.0880		0.0865
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 1,317,166,000		$ 1,291,415,000
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	0.040		0.040
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 1,646,458,000		$ 1,614,268,000
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		0.050
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	0.045		0.045
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	0.045		0.045
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	0.065		0.065
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	0.065		0.065

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings for basic and diluted earnings per common share:
Net income	$ 94,035	$ 53,097	$ 202,113	$ 91,296
Less: Preferred stock dividends	1,969	1,969	3,938	3,938
Undistributed Earnings, Basic	92,066	51,128	198,175	87,358
Undistributed Earnings, Diluted, Total	92,066	51,128	198,175	87,358
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	511	399	1,090	592
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	511	399	1,090	592
Earnings applicable to common shareholders	91,555	50,729	197,085	86,766
Earnings applicable to common shareholders	$ 91,555	$ 50,729	$ 197,085	$ 86,766
Shares:
Weighted-average common shares outstanding - basic	90,027	89,485	89,918	90,206
Effect of dilutive securities	194	85	246	185
Weighted-average common shares outstanding - diluted	90,221	89,570	90,164	90,391
Earnings per common share (1):
Basic	$ 1.02	$ 0.57	$ 2.19	$ 0.96
Diluted	$ 1.01	$ 0.57	$ 2.19	$ 0.96

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
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	55	192	28	114

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	$ 5,667,239,000	$ 5,683,199,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	226,234,000	332,856,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,724,000	7,522,000
Asset Derivatives, Fair Value, Less: Cash collateral posted	30,234,000	33,043,000
Gross derivative instruments, before netting (1)	191,276,000	292,291,000
Liability Derivatives, Notional Amount	4,758,280,000	4,741,836,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	16,292,000	12,354,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,724,000	7,522,000
Liability Derivatives, Fair Value, Less: Cash collateral posted	2,996,000	4,485,000
Derivative liability	8,572,000	347,000
CME [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Less: Cash collateral posted	72,700,000
Gross derivative instruments, before netting (1)	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	34,958,000	40,565,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	34,958,000	40,565,000
Gross derivative instruments, before netting (1)	0	0
Derivative Liability, Fair Value, Gross Liability	7,720,000	12,007,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	7,720,000	12,007,000
Derivative liability	0	0
Designated as Hedging Instrument [Member] \| Interest rate derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	1,000,000,000	1,000,000,000
Derivative Asset, Fair Value, Gross Asset	29,179,000	39,641,000
Liability Derivatives, Notional Amount	25,000,000	25,000,000
Derivative Liability, Fair Value, Gross Liability	14,000	103,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	4,667,239,000	4,683,199,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement	197,055,000	293,215,000
Liability Derivatives, Notional Amount	4,733,280,000	4,716,836,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement	16,278,000	12,251,000
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap, CME [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	200,000,000	100,000,000
Liability Derivatives, Notional Amount	3,000,000,000	3,200,000,000
Not Designated as Hedging Instrument [Member] \| Interest rate derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	4,526,290,000	4,533,441,000
Derivative Asset, Fair Value, Gross Asset	196,438,000	292,096,000
Liability Derivatives, Notional Amount	4,422,119,000	4,356,339,000
Derivative Liability, Fair Value, Gross Liability	16,137,000	11,874,000
Not Designated as Hedging Instrument [Member] \| Credit Risk Contract [Member] \| RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	83,100,000	80,500,000
Not Designated as Hedging Instrument [Member] \| Credit Risk Contract [Member] \| RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	306,800,000	338,900,000
Not Designated as Hedging Instrument [Member] \| Mortgage Banking Derivatives [Member] \| RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	32,078,000	40,771,000
Derivative Asset, Fair Value, Gross Asset	263,000	855,000
Not Designated as Hedging Instrument [Member] \| Mortgage Banking Derivatives [Member] \| RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	1,294,000	0
Derivative Liability, Fair Value, Gross Liability	2,000	0
Not Designated as Hedging Instrument [Member] \| Other Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	108,871,000	108,987,000
Derivative Asset, Fair Value, Gross Asset	354,000	264,000
Liability Derivatives, Notional Amount	309,867,000	360,497,000
Derivative Liability, Fair Value, Gross Liability	139,000	$ 377,000
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Other Commitment	$ 1,200,000

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ (754)	$ (2,904)		$ 5,926
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings			$ 3,980
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	(239)	(2,523)	4,405	3,403
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	(212)	633	(594)	1,626
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	(303)	(1,014)	169	897
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(2,522)	(609)	(4,983)	1,252
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	123	1,228	244	2,349
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	$ (2,645)	$ (1,837)	$ (5,227)	$ (1,097)

Derivative Financial Instrume_5

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Components Excluded from Assessment of Interest Rate Cash Flow Hedge Effectiveness	$ 8.6
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	(0.3)
Remaining unamortized gain (loss) on termination of cash flow hedges	(0.8)
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ (10.5)

Derivative Financial Instrume_6

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 4,724,000	$ 7,522,000
Derivative instrument asset, Amount Offset	30,234,000	33,043,000
Gross derivative instruments, before netting (1)	191,276,000	292,291,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,724,000	7,522,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	2,996,000	4,485,000
Derivative liability	8,572,000	347,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	134,000	785,000
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	134,000	785,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,915,000	1,247,000
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	1,915,000	1,247,000
Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	34,958,000	40,565,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	34,958,000	40,565,000
Gross derivative instruments, before netting (1)	0	0
Derivative Liability, Fair Value, Gross Liability	7,720,000	12,007,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	7,720,000	12,007,000
Derivative liability	0	0
CME [Member]
Derivative [Line Items]
Derivative instrument asset, Amount Offset	72,700,000
Gross derivative instruments, before netting (1)	0
Interest Rate Derivatives [Member] \| Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	29,179,000	39,641,000
Derivative Liability, Fair Value, Gross Liability	$ 14,000	$ 103,000

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ (754)	$ (2,904)		$ 5,926
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	341,488		$ 341,488		$ 344,164
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(2,522)	$ (609)	(4,983)	$ 1,252
Long-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 41,488		$ 41,488		$ 44,164

Derivative Financial Instrume_8

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge	3 years 1 month 6 days
Derivative instrument asset, Amount Offset	$ 30,234	$ 33,043
Credit Derivative, Maximum Exposure, Undiscounted	191,000
Cash and Due from Banks [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	32,200
Valuation, Market Approach [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	36,000
CME [Member]
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 72,700

Derivative Financial Instrume_9

Derivative Financial Instruments Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 4,724	$ 7,522
Derivative Asset	191,276	292,291
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,724	7,522
Derivative Liability	8,572	347
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	134	785
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	134	785
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,915	1,247
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	1,915	1,247
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	7,720	12,007
Derivative Asset, Fair Value, Gross Asset	34,958	40,565
Derivative Asset, Fair Value, Amount Offset Against Collateral	34,958	40,565
Derivative Asset	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	7,720	12,007
Derivative Liability	$ 0	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused Commitments to Extend Credit	$ 7,407,777	$ 6,755,563
Unused Commitments To Extend Credit, Carrying Amount Of Investment Written Up	400
Unused Commitments To Extend Credit, Carrying Amount Of Investment Written Down	200
Mortgage Loans in Process of Foreclosure, Amount	9,900
Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	2,800
Rabbi Trust [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	1,600
Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	17,600
Alternative investments [Member] \| Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused Commitments to Extend Credit	19,900
Unused Commitments to Extend Credit, Written Up	100
Unused Commitments to Extend Credit, Written Down	$ (300)

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, 2021	Dec. 31, 2020
Financial assets held at fair value:
Total available-for-sale investment securities	$ 3,262,893	$ 3,326,776
Gross derivative instruments, before netting (1)	191,276	292,291
Value under fair value options	4,335	14,000
Financial liabilities held at fair value:
Derivative liability	8,572	347
Agency CMO [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	120,328	154,613
Agency MBS [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	1,382,530	1,457,409
Agency CMBS [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	941,397	1,117,233
Non-agency CMBS [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	754,970	508,018
CLO [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	49,964	76,383
Corporate debt securities [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	13,704	13,120
Fair Value, Recurring [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	3,262,893	3,326,776
Alternative investments (2)	18,002	11,112
Total financial assets held at fair value	3,515,081	3,689,555
Financial liabilities held at fair value:
Derivative liability	16,292	12,354
Fair Value, Recurring [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Alternative investments (2)	0	0
Total financial assets held at fair value	3,934	5,016
Financial liabilities held at fair value:
Derivative liability	51	218
Fair Value, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	3,262,893	3,326,776
Alternative investments (2)	0	0
Total financial assets held at fair value	3,493,145	3,673,427
Financial liabilities held at fair value:
Derivative liability	16,241	12,136
Fair Value, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Alternative investments (2)	0	0
Total financial assets held at fair value	0	0
Financial liabilities held at fair value:
Derivative liability	0	0
Fair Value, Recurring [Member] \| Derivative instruments [Member]
Financial assets held at fair value:
Gross derivative instruments, before netting (1)	226,234	332,856
Fair Value, Recurring [Member] \| Derivative instruments [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Gross derivative instruments, before netting (1)	317	205
Fair Value, Recurring [Member] \| Derivative instruments [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Gross derivative instruments, before netting (1)	225,917	332,651
Fair Value, Recurring [Member] \| Derivative instruments [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Gross derivative instruments, before netting (1)	0	0
Fair Value, Recurring [Member] \| Investments Held In Rabbi Trust [Member]
Financial assets held at fair value:
Other assets	3,617	4,811
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	3,617	4,811
Fair Value, Recurring [Member] \| Investments Held In Rabbi Trust [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Other assets	0	0
Fair Value, Recurring [Member] \| Investments Held In Rabbi Trust [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Other assets	0	0
Fair Value, Recurring [Member] \| Loan Origination Commitments [Member]
Financial assets held at fair value:
Value under fair value options	4,335	14,000
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:
Value under fair value options	0	0
Fair Value, Recurring [Member] \| Loan Origination Commitments [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Value under fair value options	4,335	14,000
Fair Value, Recurring [Member] \| Loan Origination Commitments [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Value under fair value options	0	0
Fair Value, Recurring [Member] \| Agency CMO [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	120,328	154,613
Fair Value, Recurring [Member] \| Agency CMO [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Agency CMO [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	120,328	154,613
Fair Value, Recurring [Member] \| Agency CMO [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Agency MBS [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	1,382,530	1,457,409
Fair Value, Recurring [Member] \| Agency MBS [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Agency MBS [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	1,382,530	1,457,409
Fair Value, Recurring [Member] \| Agency MBS [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Agency CMBS [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	941,397	1,117,233
Fair Value, Recurring [Member] \| Agency CMBS [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Agency CMBS [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	941,397	1,117,233
Fair Value, Recurring [Member] \| Agency CMBS [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Non-agency CMBS [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	754,970	508,018
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:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Non-agency CMBS [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	754,970	508,018
Fair Value, Recurring [Member] \| Non-agency CMBS [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| CLO [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	49,964	76,383
Fair Value, Recurring [Member] \| CLO [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| CLO [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	49,964	76,383
Fair Value, Recurring [Member] \| CLO [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Corporate debt securities [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	13,704	13,120
Fair Value, Recurring [Member] \| Corporate debt securities [Member] \| Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	0	0
Fair Value, Recurring [Member] \| Corporate debt securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	13,704	13,120
Fair Value, Recurring [Member] \| Corporate debt securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Total available-for-sale investment securities	$ 0	$ 0

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Option, Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Value under fair value options	$ 4,335	$ 14,000
Loans held for sale (valued under fair value option $4,335 and $14,000)	4,335	14,012
Fair Value, Option, Loans Held as Assets, Aggregate Difference	(510)	489
loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale (valued under fair value option $4,335 and $14,000)	$ 4,845	$ 13,511

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, Fair Value	$ 5,794,155		$ 5,835,364
Mortgage servicing assets, Carrying Amount	11,501	$ 12,327	13,422	$ 14,926	$ 16,391	$ 17,484
Fair Value, Nonrecurring [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-Maturity, Carrying Amount	5,623,243		5,567,889
Loans and leases, net	21,167,056		21,281,784
Securities sold under agreements to repurchase and other borrowings	507,124		995,355
FHLB advances	138,444		133,164
Long-term debt	565,297		567,663
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]
Time deposits	26,832,422		24,847,618
Fair Value, Nonrecurring [Member] \| Reported Value Measurement [Member] \| Time Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	2,014,544		2,487,818
Fair Value, Nonrecurring [Member] \| Reported Value Measurement [Member] \| Residential
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount	11,501		13,422
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	5,794,155		5,835,364
Securities sold under agreements to repurchase and other borrowings	513,384		1,000,189
FHLB advances	142,736		139,035
Long-term debt	523,139		538,407
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	21,242,694		21,413,397
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]
Time deposits	26,832,422		24,847,618
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]
Time deposits	2,016,468		2,494,601
Fair Value, Nonrecurring [Member] \| Estimate of Fair Value Measurement [Member] \| Residential \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Fair value	$ 16,578		$ 14,362

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Retirement Benefit Plans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected long-term rate of return			5.50%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	$ 1,166	$ 1,675	$ 2,332	$ 3,350
Expected return on plan assets	(3,596)	(3,380)	(7,191)	(6,760)
Recognized net loss (gain)	1,020	993	2,039	1,985
Net periodic benefit (income) cost	(1,410)	(712)	(2,820)	(1,425)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	6	12	13	23
Expected return on plan assets	0	0	0	0
Recognized net loss (gain)	9	6	17	12
Net periodic benefit (income) cost	15	18	30	35
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	4	12	8	25
Expected return on plan assets	0	0	0	0
Recognized net loss (gain)	(20)	(8)	(40)	(17)
Net periodic benefit (income) cost	$ (16)	$ 4	$ (32)	$ 8

Segment Reporting Segment Repor

Segment Reporting Segment Reporting Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)Segment	Jan. 01, 2021USD ($)	Dec. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments \| Segment	3
Goodwill	$ 538,373		$ 538,373
Commercial Banking \| Scenario, Adjustment
Segment Reporting Information [Line Items]
Goodwill		$ 131,000
Retail Banking \| Scenario, Adjustment
Segment Reporting Information [Line Items]
Goodwill		$ (131,000)

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Goodwill	$ 538,373		$ 538,373		$ 538,373
Assets	33,753,752		33,753,752		32,590,690
Net interest income	220,852	$ 224,407	444,616	$ 455,208
Non-interest income	72,702	60,076	149,459	133,454
Non-interest expense	187,028	176,584	375,010	355,420
Pre-tax, pre-provision net revenue	106,526	107,899	219,065	233,242
Provision for credit losses	(21,500)	40,000	(47,250)	116,000
Income before income tax expense	128,026	67,899	266,315	117,242
Income tax expense	33,991	14,802	64,202	25,946
Net income	94,035	53,097	202,113	91,296
Operating Segments [Member] \| Commercial Banking
Segment Reporting Information [Line Items]
Goodwill	131,000		131,000		131,000
Assets	14,837,710		14,837,710		14,732,792
Net interest income	141,124	128,123	283,162	245,710
Non-interest income	25,713	21,849	50,890	44,265
Non-interest expense	61,445	61,261	126,281	126,482
Pre-tax, pre-provision net revenue	105,392	88,711	207,771	163,493
Provision for credit losses	(23,328)	43,569	(42,701)	112,587
Income before income tax expense	128,720	45,142	250,472	50,906
Income tax expense	32,566	11,015	63,369	12,421
Net income	96,154	34,127	187,103	38,485
Operating Segments [Member] \| HSA Bank
Segment Reporting Information [Line Items]
Goodwill	21,813		21,813		21,813
Assets	78,054		78,054		80,352
Net interest income	42,193	39,334	84,302	82,007
Non-interest income	26,554	23,103	53,559	49,486
Non-interest expense	32,792	34,020	69,042	71,098
Pre-tax, pre-provision net revenue	35,955	28,417	68,819	60,395
Provision for credit losses	0	0	0	0
Income before income tax expense	35,955	28,417	68,819	60,395
Income tax expense	9,600	7,587	18,375	16,125
Net income	26,355	20,830	50,444	44,270
Operating Segments [Member] \| Retail Banking
Segment Reporting Information [Line Items]
Goodwill	385,560		385,560		385,560
Assets	7,432,340		7,432,340		7,726,287
Net interest income	92,540	81,609	181,353	162,808
Non-interest income	16,763	16,281	32,834	34,724
Non-interest expense	72,346	77,119	148,470	157,409
Pre-tax, pre-provision net revenue	36,957	20,771	65,717	40,123
Provision for credit losses	1,754	(3,566)	(4,632)	3,501
Income before income tax expense	35,203	24,337	70,349	36,622
Income tax expense	7,745	5,305	15,477	7,983
Net income	27,458	19,032	54,872	28,639
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	0		0		0
Assets	11,405,648		11,405,648		$ 10,051,259
Net interest income	(55,005)	(24,659)	(104,201)	(35,317)
Non-interest income	3,672	(1,157)	12,176	4,979
Non-interest expense	20,445	4,184	31,217	431
Pre-tax, pre-provision net revenue	(71,778)	(30,000)	(123,242)	(30,769)
Provision for credit losses	74	(3)	83	(88)
Income before income tax expense	(71,852)	(29,997)	(123,325)	(30,681)
Income tax expense	(15,920)	(9,105)	(33,019)	(10,583)
Net income	$ (55,932)	$ (20,892)	$ (90,306)	$ (20,098)

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 54,181	$ 45,043	$ 106,588	$ 98,210
Non-interest income	72,702	60,076	149,459	133,454
Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	41,439	35,839	81,908	78,409
Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10,087	7,102	19,490	15,841
Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,655	2,102	5,190	3,960
Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	18,521
Non-interest income		15,033	42,871	35,244
Operating Segments [Member] \| Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	14,476	10,946	28,291	23,859
Non-interest income	25,713	21,849	50,890	44,265
Operating Segments [Member] \| Commercial Banking \| Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,104	3,443	8,205	7,354
Operating Segments [Member] \| Commercial Banking \| Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10,096	7,140	19,508	15,886
Operating Segments [Member] \| Commercial Banking \| Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	276	363	578	619
Operating Segments [Member] \| Commercial Banking \| Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11,237
Non-interest income		10,903	22,599	20,406
Operating Segments [Member] \| HSA Bank
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26,554	23,103	53,559	49,486
Non-interest income	26,554	23,103	53,559	49,486
Operating Segments [Member] \| HSA Bank \| Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	24,478	21,741	49,496	46,583
Operating Segments [Member] \| HSA Bank \| 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 \| Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,076	1,362	4,063	2,903
Operating Segments [Member] \| HSA Bank \| Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Non-interest income		0	0	0
Operating Segments [Member] \| Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13,037	11,125	24,586	24,926
Non-interest income	16,763	16,281	32,834	34,724
Operating Segments [Member] \| Retail Banking \| Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	12,734	10,748	24,037	24,488
Operating Segments [Member] \| Retail Banking \| 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] \| Retail Banking \| Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	303	377	549	438
Operating Segments [Member] \| Retail Banking \| Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,726
Non-interest income		5,156	8,248	9,798
Corporate, Non-Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	114	(131)	152	(61)
Non-interest income	3,672	(1,157)	12,176	4,979
Corporate, Non-Segment [Member] \| Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	123	(93)	170	(16)
Corporate, Non-Segment [Member] \| Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(9)	(38)	(18)	(45)
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]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,558
Non-interest income		$ (1,026)	$ 12,024	$ 5,040

Commitments and Contingencies_2

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 7,407,777	$ 6,755,563
Standby letter of credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	213,751	207,201
Commercial letter of credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	50,120	30,522
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 7,143,906	$ 6,517,840

(Reserve for Unfunded Commitmen

(Reserve for Unfunded Commitments) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Standards Update 2016-13 [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 0	$ 0	$ 0	$ 9,139
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	12,800	10,084	12,755	2,367
(Benefit) provision	(826)	655	(781)	(767)
Ending balance	$ 11,974	$ 10,739	$ 11,974	$ 10,739

Business Developments - Narrati

Business Developments - Narrative (Details) $ in Millions	Apr. 19, 2021	Jun. 30, 2021USD ($)
Business Acquisition [Line Items]
Merger-related expenses		$ 17.1
Sterling
Business Acquisition [Line Items]
Share exchange ratio	0.463

Business Developments - Changes

Business Developments - Changes in Reserves Associated with Strategic Initiatives (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Restructuring Reserve [Roll Forward]
Beginning balance	$ 22,915	$ 19,795
Charged to earnings	1,138	10,579
Charged against assets	(362)	(2,175)
Cash payments	(7,497)	(12,005)
Ending balance	16,194	16,194
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning balance	18,370	17,675
Charged to earnings	45	2,105
Charged against assets	0	0
Cash payments	(4,451)	(5,816)
Ending balance	13,964	13,964
Other Restructuring
Restructuring Reserve [Roll Forward]
Beginning balance	4,545	2,120
Charged to earnings	1,063	8,265
Charged against assets	(332)	(1,966)
Cash payments	(3,046)	(6,189)
Ending balance	2,230	2,230
Right-of-Use Asset Charges
Restructuring Reserve [Roll Forward]
Beginning balance	0	0
Charged to earnings	30	209
Charged against assets	(30)	(209)
Cash payments	0	0
Ending balance	$ 0	$ 0