Webster Financial (WBS) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 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		90,420,187
Entity Central Index Key	0000801337
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2021
Amendment Flag	false
Document Fiscal Period Focus	Q1
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	Mar. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Cash and due from banks	$ 160,703	$ 193,501
Interest-bearing deposits	1,210,958	69,603
Investment securities available-for-sale, at fair value	3,313,980	3,326,776
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	5,568,093	5,568,188
Allowance for credit losses on investment securities held-to-maturity	(308)	(299)
Investment securities held-to-maturity, net	5,567,785	5,567,889
Federal Home Loan Bank and Federal Reserve Bank stock	77,674	77,594
Loans held for sale (valued under fair value option $17,260 and $14,000)	17,262	14,012
Loans and leases	21,301,383	21,641,215
Allowance for credit losses on loans and leases	(328,351)	(359,431)
Loans and leases, net	20,973,032	21,281,784
Deferred tax assets, net	80,235	81,286
Premises and equipment, net	220,982	226,743
Goodwill	538,373	538,373
Other intangible assets, net	21,244	22,383
Cash surrender value of life insurance policies	567,298	564,195
Accrued interest receivable and other assets	509,511	626,551
Total assets	33,259,037	32,590,690
Liabilities and Equity [Abstract]
Non-interest-bearing	6,680,114	6,155,592
Interest-bearing	21,801,720	21,179,844
Total deposits	28,481,834	27,335,436
Securities sold under agreements to repurchase and other borrowings	498,378	995,355
Federal Home Loan Bank advances	138,554	133,164
Long-term debt	566,480	567,663
Operating lease liabilities	156,910	158,280
Accrued expenses and other liabilities	143,953	166,167
Total liabilities	29,986,109	29,356,065
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock	145,037	145,037
Common stock	937	937
Paid-in capital	1,105,137	1,109,532
Retained earnings	2,147,436	2,077,522
Treasury stock, at cost (3,276,534 and 3,487,389 shares)	(133,893)	(140,659)
Accumulated other comprehensive income, net of tax	8,274	42,256
Total shareholders' equity	3,272,928	3,234,625
Total liabilities and shareholders' equity	$ 33,259,037	$ 32,590,690

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
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 issued and outstanding (6,000 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 (3,276,534 and 3,487,389 shares)	3,276,534	3,487,389

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest and Dividend Income, Operating [Abstract]
Interest and fees on loans and leases	$ 190,536	$ 216,187
Taxable interest and dividends on investments	39,614	52,622
Non-taxable interest on investment securities	5,333	5,486
Loans held for sale	91	175
Total interest income	235,574	274,470
Interest Expense [Abstract]
Deposits	6,439	27,843
Securities sold under agreements to repurchase and other borrowings	635	3,730
Federal Home Loan Bank advances	513	6,869
Long-term debt	4,223	5,227
Total interest expense	11,810	43,669
Net interest income	223,764	230,801
Provision for credit losses	(25,750)	76,000
Net interest income after provision for credit losses	249,514	154,801
Noninterest Income [Abstract]
Deposit service fees	40,469	42,570
Loan and lease related fees	8,313	6,496
Wealth and investment services	9,403	8,739
Mortgage banking activities	2,642	2,893
Increase in cash surrender value of life insurance policies	3,533	3,580
Gain on Sale of Investments	0	8
Other income	12,397	9,092
Total non-interest income	76,757	73,378
Noninterest Expense [Abstract]
Compensation and benefits	107,600	101,887
Occupancy	15,650	14,485
Technology and equipment	28,516	27,837
Intangible assets amortization	1,139	962
Marketing	2,504	3,502
Professional and outside services	9,776	5,663
Deposit insurance	3,956	4,725
Other expense	18,841	19,775
Total non-interest expense	187,982	178,836
Income before income tax expense	138,289	49,343
Income tax expense	30,211	11,144
Net income	108,078	38,199
Preferred stock dividends and other	(2,548)	(2,178)
Earnings applicable to common shareholders	$ 105,530	$ 36,021
Earnings Per Share, Basic and Diluted [Abstract]
Basic	$ 1.18	$ 0.40
Diluted	$ 1.17	$ 0.39

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 108,078	$ 38,199
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Investment securities available-for-sale	(30,353)	(15,689)
Derivative instruments	(4,372)	26,232
Defined benefit pension and other postretirement benefit plans	743	729
Other comprehensive (loss) income, net of tax	(33,982)	11,272
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total	$ 74,096	$ 49,471

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 Income, Net of Tax	Accumulated Other Comprehensive Income, 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	38,199									38,199
Other Comprehensive Income (Loss), Net of Tax	11,272														11,272
Dividends and dividend equivalents declared on common stock	(36,828)									(36,828)
Dividends on preferred stock			$ (1,969)									$ (1,969)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	2,609							(11,821)		0			14,430
Stock Issued During Period, Value, Stock Options Exercised	118							(105)					223
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(3,160)												(3,160)
Stock Repurchased During Period, Value	(76,556)												(76,556)
Ending 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]
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	108,078									108,078
Other Comprehensive Income (Loss), Net of Tax	(33,982)														(33,982)
Dividends and dividend equivalents declared on common stock	(36,195)									(36,195)
Dividends on preferred stock			$ (1,969)									$ (1,969)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	2,965							649		0			2,316
Stock Issued During Period, Value, Stock Options Exercised	3,314							(5,044)					8,358
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(3,908)												(3,908)
Ending 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]
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	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 108,078	$ 38,199
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Provision for credit losses	(25,750)	76,000
Deferred Income Tax Expense (Benefit)	13,192	(6,518)
Depreciation, Amortization and Accretion, Net	10,351	9,063
Accretion (Amortization) of Discounts and Premiums, Investments	35,583	10,345
Share-based Payment Arrangement, Noncash Expense	2,965	2,609
Gains (Losses) on Sales of Other Real Estate	29	(363)
Gain (Loss) on Disposition of Property Plant Equipment	197	100
Available-for-sale Securities, Gross Realized Gains	0	(8)
Life Insurance, Corporate or Bank Owned, Change in Value	(3,533)	(3,580)
Bank Owned Life Insurance Income	(410)	(6)
Gain (Loss) on Sales of Loans, Net	(2,642)	(2,893)
Proceeds from Sale of Loans Held-for-sale	79,308	75,594
Payments for Origination of Mortgage Loans Held-for-sale	(81,361)	(59,562)
Increase (Decrease) in Financial Instruments Used in Operating Activities	58	(2,660)
Increase (Decrease) in Derivative Assets and Liabilities	128,550	(189,718)
Increase (Decrease) in Other Operating Assets	4,083	5,447
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities	(39,873)	(13,637)
Net Cash Provided by (Used in) Operating Activities, Total	228,825	(61,588)
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Debt Securities, Available-for-sale	(291,386)	(122,353)
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	255,362	124,848
Proceeds from Sale of Available-for-sale Securities	0	8,963
Payments to Acquire Held-to-maturity Securities	(356,624)	(371,935)
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities	343,825	172,032
Payments for (Proceeds from) Federal Home Loan Bank Stock	(80)	7,719
Payments for (Proceeds from) Other Investing Activities	(3,526)	(2,192)
Payments for (Proceeds from) Other Loans and Leases	302,554	(863,351)
Proceeds of Other Loans and Leases Held-for-investment	16,787	390
Proceeds from Life Insurance Policy	1,100	750
Proceeds from Sale of Foreclosed Assets	44	2,636
Proceeds from Sale of Productive Assets	250	0
Payments to Acquire Property, Plant, and Equipment	(3,680)	(3,548)
Net Cash Provided by (Used in) Investing Activities, Total	264,626	(1,046,041)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Increase (Decrease) in Deposits	1,145,364	1,188,728
Proceeds from FHLBank Borrowings, Financing Activities	80,470	2,950,000
Payments of FHLBank Borrowings, Financing Activities	(75,080)	(3,125,077)
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	(496,977)	222,318
Payments of Ordinary Dividends, Common Stock	(36,108)	(36,728)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(1,969)	(1,969)
Proceeds from Stock Options Exercised	3,314	118
Payments for Repurchase of Common Stock	0	(76,556)
Payments for Repurchase of Equity, Share-based Compensation	(3,908)	(3,160)
Net Cash Provided by (Used in) Financing Activities, Total	615,106	1,117,674
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	1,108,557	10,045
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	1,371,661	267,940
Supplemental Cash Flow Information [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	16,638	50,327
Income Taxes Paid	3,355	4,928
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	151	2,627
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 16,587	$ 214

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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. 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 had an immaterial effect on the Company's consolidated financial statements. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. 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 March 31, 2021.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 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 March 31, 2021 and December 31, 2020, the aggregate carrying value of the Company's tax credit-finance investments was $36.0 million and $37.2 million, respectively, which represents the Company's maximum exposure to loss. At March 31, 2021 and December 31, 2020, unfunded commitments have been recognized, totaling $9.0 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 March 31, 2021 and December 31, 2020, the aggregate carrying value of the Company's other non-marketable investments in VIEs was $40.2 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 $75.3 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	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 74,319 $ 1,494 $ (97) $ 75,716 $ — $ 74,319 Agency MBS 2,365,314 104,626 (4,824) 2,465,116 — 2,365,314 Agency CMBS 2,182,794 28,832 (22,872) 2,188,754 — 2,182,794 Municipal bonds and notes 735,969 49,669 — 785,638 308 735,661 CMBS 209,697 5,805 — 215,502 — 209,697 Held-to-maturity securities $ 5,568,093 $ 190,426 $ (27,793) $ 5,730,726 $ 308 $ 5,567,785 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 $17.3 million and $22.1 million at March 31, 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 as of March 31, 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 March 31, (In thousands) 2021 2020 Balance beginning of period $ 299 $ — Adoption of ASU No. 2016-13 (CECL) — 397 Provision (benefit) for credit losses 9 (85) Balance end of period $ 308 $ 312 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. Securities shown below that are not rated are collateralized with U.S. Treasury 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 as of March 31, 2021: Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Baa2 Not Rated Agency CMOs $ — $ 74,319 $ — $ — $ — $ — $ — $ — $ — Agency MBS — 2,365,315 — — — — — — — Agency CMBS — 2,182,794 — — — — — — — Municipal bonds and notes 208,995 125,355 240,215 114,328 33,225 8,471 2,066 190 3,123 CMBS 209,697 — — — — — — — — Total held-to-maturity $ 418,692 $ 4,747,783 $ 240,215 $ 114,328 $ 33,225 $ 8,471 $ 2,066 $ 190 $ 3,123 As of March 31, 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 March 31, 2021 (In thousands) Amortized Fair Due in one year or less $ 380 $ 382 Due after one year through five years 4,160 4,384 Due after five years through ten years 288,056 297,857 Due after ten years 5,275,497 5,428,103 Total held-to-maturity debt securities $ 5,568,093 $ 5,730,726 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 March 31, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value (2) Agency CMO $ 132,613 $ 5,109 $ (119) $ 137,603 Agency MBS 1,408,543 55,423 (7,510) 1,456,456 Agency CMBS 975,433 9,819 (10,667) 974,585 CMBS 662,805 1,193 (985) 663,013 CLO 68,700 12 (69) 68,643 Corporate debt 14,563 6 (889) 13,680 Available-for-sale securities $ 3,262,657 $ 71,562 $ (20,239) $ 3,313,980 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 $7.1 million and $7.5 million at March 31, 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, 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 March 31, 2021 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized # of Fair Unrealized Agency CMO $ 11,083 $ (69) $ 4,336 $ (50) 4 $ 15,419 $ (119) Agency MBS 205,383 (7,362) 8,853 (148) 44 214,236 (7,510) Agency CMBS 466,547 (10,667) — — 13 466,547 (10,667) CMBS 224,636 (547) 185,198 (438) 33 409,834 (985) CLO 24,997 (3) 24,934 (66) 2 49,931 (69) Corporate debt — — 9,405 (889) 2 9,405 (889) Available-for-sale in unrealized loss position $ 932,646 $ (18,648) $ 232,726 $ (1,591) 98 $ 1,165,372 $ (20,239) 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 because the securities are high credit quality, investment grade securities that the Company does not intend to sell and will not be required to sell prior to their anticipated recovery, and the decline in fair value is primarily attributable to higher market rates in selected asset classes. Fair value is expected to recover as the securities approach maturity. As of March 31, 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 March 31, 2021 (In thousands) Amortized Fair Due in one year or less $ — $ — Due after one year through five years 1,307 1,348 Due after five through ten years 226,061 226,260 Due after ten years 3,035,289 3,086,372 Total available-for-sale debt securities $ 3,262,657 $ 3,313,980 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 months ended March 31, 2021. For the three months ended March 31, 2020, proceeds from sales of available-for-sale securities were $9.0 million, which resulted in realized gains of $8 thousand. Other Information At March 31, 2021, the Company had a carrying value of $1.4 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 $1.3 billion at March 31, 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	3 Months Ended
	Mar. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	Loans and Leases The following table summarizes loans and leases: (In thousands) At March 31, At December 31, 2020 Commercial non-mortgage $ 6,918,626 $ 7,085,076 Asset-based 907,421 890,598 Commercial real estate 6,338,056 6,322,637 Equipment financing 611,440 602,224 Commercial portfolio 14,775,543 14,900,535 Residential 4,668,945 4,782,016 Home equity 1,724,599 1,802,865 Other consumer 132,296 155,799 Consumer portfolio 6,525,840 6,740,680 Loans and leases (1) (2) (3) $ 21,301,383 $ 21,641,215 (1) Loan balances include net deferred (fees)/costs and net (premiums)/discounts of $(20.1) million and $(10.5) million at March 31, 2021 and December 31, 2020, respectively. (2) At March 31, 2021, the Company had pledged $7.6 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 $58.5 million and $57.8 million at March 31, 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 $223.9 million. Total undiscounted cash flows, primarily due within the next five years, amounting to $243.3 million, at March 31, 2021. This lessor activity resulted in interest income of $1.9 million and $1.5 million for the three months ended March 31, 2021 and 2020, respectively. Loans and Leases Aging The following table summarizes the aging of loans and leases: At March 31, 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 $ 1,460 $ 135 $ 50 $ 53,871 $ 55,516 $ 6,863,110 $ 6,918,626 Asset-based — — — 2,402 2,402 905,019 907,421 Commercial real estate 508 197 — 13,752 14,457 6,323,599 6,338,056 Equipment financing 5,778 37 — 6,080 11,895 599,545 611,440 Commercial portfolio 7,746 369 50 76,105 84,270 14,691,273 14,775,543 Residential 4,079 1,186 — 42,768 48,033 4,620,912 4,668,945 Home equity 4,514 1,371 — 30,892 36,777 1,687,822 1,724,599 Other consumer 510 657 — 596 1,763 130,533 132,296 Consumer portfolio 9,103 3,214 — 74,256 86,573 6,439,267 6,525,840 Total $ 16,849 $ 3,583 $ 50 $ 150,361 $ 170,843 $ 21,130,540 $ 21,301,383 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 March 31, 2021 At December 31, 2020 (In thousands) Non-accrual Non-accrual With No Allowance Non-accrual Non-accrual With No Allowance Commercial non-mortgage $ 53,871 $ 10,635 $ 64,073 $ 16,985 Asset-based 2,402 2,402 2,594 — Commercial real estate 13,752 554 21,231 15,529 Equipment financing 6,080 2,758 7,299 2,983 Commercial portfolio 76,105 16,349 95,197 35,497 Residential 42,768 31,274 41,081 29,843 Home equity 30,892 23,370 31,030 24,091 Other consumer 596 38 652 2 Consumer portfolio 74,256 54,682 72,763 53,936 Total $ 150,361 $ 71,031 $ 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 $4.0 million and $3.3 million for the three months ended March 31, 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 March 31, 2021 At or for the three months ended March 31, 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 (23,653) (2,106) (25,759) 71,243 4,842 76,085 Charge-offs (6,321) (2,974) (9,295) (5,574) (4,587) (10,161) Recoveries 1,636 2,338 3,974 564 1,779 2,343 Balance, end of period $ 283,906 $ 44,445 $ 328,351 $ 261,926 $ 73,005 $ 334,931 Individually evaluated for impairment 14,809 4,913 19,722 8,235 4,777 13,012 Collectively evaluated for impairment $ 269,097 $ 39,532 $ 308,629 $ 253,691 $ 68,228 $ 321,919 Loan and lease balances: Individually evaluated for impairment $ 149,145 $ 140,066 $ 289,211 $ 177,012 $ 155,105 $ 332,117 Collectively evaluated for impairment 14,626,398 6,385,774 21,012,172 13,511,409 7,047,998 20,559,407 Loans and leases $ 14,775,543 $ 6,525,840 $ 21,301,383 $ 13,688,421 $ 7,203,103 $ 20,891,524 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 as of March 31, 2021 and December 31, 2020: At March 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage Pass $ 832,940 $ 2,168,628 $ 957,425 $ 794,005 $ 443,935 $ 416,891 $ 846,850 $ 6,460,674 Special mention — 7,430 33,416 63,403 128 19,991 31,380 155,748 Substandard — 71,611 50,013 82,673 27,423 36,782 33,702 302,204 Commercial non-mortgage 832,940 2,247,669 1,040,854 940,081 471,486 473,664 911,932 6,918,626 Asset-based Pass — 25,881 15,711 22,572 10,890 26,675 762,386 864,115 Special mention — — — 750 — — 40,154 40,904 Substandard — — 2,402 — — — — 2,402 Asset-based — 25,881 18,113 23,322 10,890 26,675 802,540 907,421 Commercial real estate Pass 172,136 921,002 1,473,799 1,227,983 519,241 1,655,611 25,038 5,994,810 Special mention — 27 19,569 40,601 37,690 107,235 — 205,122 Substandard — 813 789 21,884 60,794 53,844 — 138,124 Commercial real estate 172,136 921,842 1,494,157 1,290,468 617,725 1,816,690 25,038 6,338,056 Equipment financing Pass 66,283 232,733 127,083 59,846 22,961 54,613 — 563,519 Special mention — 3,435 11,316 5,185 868 1,376 — 22,180 Substandard 921 10,292 4,484 6,148 1,480 2,416 — 25,741 Equipment financing 67,204 246,460 142,883 71,179 25,309 58,405 — 611,440 Commercial portfolio $ 1,072,280 $ 3,441,852 $ 2,696,007 $ 2,325,050 $ 1,125,410 $ 2,375,434 $ 1,739,510 $ 14,775,543 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 as of March 31, 2021 and December 31, 2020: At March 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Residential 800+ $ 78,004 $ 453,272 $ 226,982 $ 51,458 $ 155,714 $ 962,687 $ — $ 1,928,117 740-799 205,938 558,551 221,807 54,091 113,276 591,184 — 1,744,847 670-739 77,109 170,166 102,503 33,129 68,460 303,718 — 755,085 580-669 5,117 16,295 16,945 5,500 11,770 96,122 — 151,749 579 and below — — 31,835 1,363 1,966 53,983 — 89,147 Residential 366,168 1,198,284 600,072 145,541 351,186 2,007,694 — 4,668,945 Home equity 800+ 8,442 32,410 14,380 21,538 14,293 73,450 521,206 685,719 740-799 9,444 31,016 12,578 16,077 9,282 48,763 418,897 546,057 670-739 3,885 12,664 8,083 11,652 8,804 47,326 255,186 347,600 580-669 — 1,299 1,622 2,123 2,360 18,061 78,951 104,416 579 and below 22 326 737 967 802 7,671 30,282 40,807 Home equity 21,793 77,715 37,400 52,357 35,541 195,271 1,304,522 1,724,599 Other consumer 800+ 51 703 1,458 649 250 213 7,717 11,041 740-799 327 2,645 5,498 2,328 775 505 7,955 20,033 670-739 1,948 13,017 26,345 9,072 1,761 444 3,681 56,268 580-669 56 9,495 16,063 6,258 963 232 1,419 34,486 579 and below 53 2,269 4,430 1,804 428 232 1,252 10,468 Other consumer 2,435 28,129 53,794 20,111 4,177 1,626 22,024 132,296 Consumer portfolio 390,396 1,304,128 691,266 218,009 390,904 2,204,591 1,326,546 6,525,840 Commercial portfolio 1,072,280 3,441,852 2,696,007 2,325,050 1,125,410 2,375,434 1,739,510 14,775,543 Loans and leases $ 1,462,676 $ 4,745,980 $ 3,387,273 $ 2,543,059 $ 1,516,314 $ 4,580,025 $ 3,066,056 $ 21,301,383 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 March 31, 2021 (In thousands) Unpaid Amortized Cost Amortized Cost No Allowance Amortized Cost With Allowance Related Commercial non-mortgage $ 149,125 $ 114,352 $ 55,091 $ 59,261 $ 11,345 Asset-based 2,499 2,402 2,402 — — Commercial real estate 30,005 26,311 10,466 15,845 2,548 Equipment financing 6,566 6,080 2,758 3,322 916 Residential 98,331 92,517 56,710 35,807 2,940 Home equity 53,155 46,953 33,299 13,654 1,764 Other consumer 604 596 38 558 209 Total $ 340,285 $ 289,211 $ 160,764 $ 128,447 $ 19,722 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 March 31, 2021 2020 (In thousands) Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Commercial non-mortgage $ 117,118 $ 859 $ — $ 122,835 $ 1,053 $ — Asset-based 2,498 — — 138 — — Commercial real estate 30,095 182 — 23,903 146 — Equipment financing 6,689 — — 7,192 — — Residential 95,339 639 273 97,778 830 630 Home equity 46,951 222 214 41,902 391 830 Other consumer 625 — — 512 17 — Total $ 299,315 $ 1,902 $ 487 $ 294,260 $ 2,437 $ 1,460 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 $147.7 million at March 31, 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 March 31, 2021 At December 31, 2020 (In thousands) Collateral Dependent Not Considered Collateral Dependent Total Collateral Dependent Not Considered Collateral Dependent Total Commercial non-mortgage $ 20,717 $ 93,635 $ 114,352 $ 11,074 $ 108,810 $ 119,884 Asset-based 2,402 — 2,402 2,504 90 2,594 Commercial real estate 21,671 4,640 26,311 28,482 5,397 33,879 Equipment financing — 6,080 6,080 — 7,298 7,298 Residential 36,096 56,421 92,517 33,980 64,184 98,164 Home equity 26,759 20,194 46,953 26,796 20,154 46,950 Other consumer — 596 596 — 653 653 Total amortized cost of CDA $ 107,645 $ 181,566 $ 289,211 $ 102,836 $ 206,586 $ 309,422 Troubled Debt Restructurings The following table summarizes information for TDRs: (In thousands) At March 31, At December 31, 2020 Accrual status $ 138,379 $ 140,089 Non-accrual status 83,723 95,338 Total TDRs $ 222,102 $ 235,427 Specific reserves for TDRs included in the balance of ACL on loans and leases $ 14,293 $ 12,728 Additional funds committed to borrowers in TDR status 14,606 12,895 The portion of TDRs deemed to be uncollectible, $1.9 million and $1.2 million for the three months ended March 31, 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 March 31, 2021 2020 Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) (Dollars in thousands) Commercial portfolio Extended Maturity 7 $ 690 2 $ 104 Maturity/Rate Combined 1 37 6 552 Other (2) 2 113 10 27,137 Consumer portfolio Extended Maturity 2 127 1 264 Maturity/Rate Combined 5 1,011 4 456 Other (2) 9 666 14 1,726 Total TDRs 26 $ 2,644 37 $ 30,239 (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 months ended March 31, 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 March 31, 2021 At December 31, 2020 Pass $ 12,724 $ 12,462 Special Mention — — Substandard 98,175 105,070 Doubtful — 163 Total $ 110,899 $ 117,695

Transfers of Financial Assets

Transfers of Financial Assets	3 Months Ended
	Mar. 31, 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 March 31, (In thousands) 2021 2020 Beginning balance $ 747 $ 508 Provision charged to expense 23 22 (Charge-offs/settlements) recoveries, net — 103 Ending balance $ 770 $ 633 The following table provides information for mortgage banking activities: Three months ended March 31, (In thousands) 2021 2020 Residential mortgage loans held for sale: Proceeds from sale $ 79,308 $ 75,594 Loans sold with servicing rights retained 75,691 72,091 Net gain on sale 2,109 2,519 Ancillary fees 541 401 Fair value option adjustment (8) (27) Additionally, loans not originated for sale were sold approximately at carrying value for cash proceeds of $16.8 million, resulting in a gain of approximately $191 thousand, for certain commercial loans for the three months ended March 31, 2021, and $0.4 million for certain commercial loans for the three months ended March 31, 2020. The Company services residential mortgage loans for other entities totaling $2.2 billion at March 31, 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 March 31, (In thousands) 2021 2020 Beginning balance $ 13,422 $ 17,484 Additions 586 1,189 Amortization (1,490) (1,707) Adjustment to valuation allowance (191) (575) Ending balance $ 12,327 $ 16,391 Loan servicing fees, net of mortgage servicing rights amortization, were $0.4 million and $0.5 million for the three months ended March 31, 2021 and 2020, respectively, and are included as a component of loan 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	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Operating Leases Condensed Consolidated Balance Sheet Line Item Location ROU lease assets $ 127,423 Premises and equipment, net Lease liabilities 156,910 Operating lease liabilities The components of operating lease cost and other related information are as follows: At or for the three months ended March 31, (In thousands) 2021 2020 Lease Cost: Operating lease costs $ 6,557 $ 7,424 Variable lease costs 1,300 1,427 Sublease income (131) (145) Total operating lease cost $ 7,726 $ 8,706 Other Information: Cash paid for amounts included in the measurement of lease liabilities $ 7,833 $ 7,758 ROU lease assets obtained in exchange for new operating lease liabilities 5,398 8,666 The undiscounted scheduled maturities reconciled to total operating lease liabilities are as follows: (In thousands) At March 31, 2021 Remainder of 2021 $ 20,323 2022 27,762 2023 25,259 2024 22,250 2025 20,267 Thereafter 64,364 Total operating lease liability payments 180,225 Less: Present value adjustment 23,315 Lease liabilities $ 156,910 Weighted-average remaining lease term, in years 7.95 Weighted-average discount rate 3.14%

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 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 months ended March 31, 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 March 31, 2021 At December 31, 2020 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying HSA Bank - Core deposits $ 26,625 $ 16,352 $ 10,273 $ 26,625 $ 15,618 $ 11,007 HSA Bank - Customer relationships 21,000 10,029 10,971 21,000 9,624 11,376 Total other intangible assets $ 47,625 $ 26,381 $ 21,244 $ 47,625 $ 25,242 $ 22,383 At March 31, 2021, the remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) Remainder of 2021 $ 3,374 2022 4,411 2023 4,315 2024 2,084 2025 2,084 Thereafter 4,976

Deposits

Deposits	3 Months Ended
	Mar. 31, 2021
Deposit Liabilities [Abstract]
Deposits	Deposits A summary of deposits by type is as follows: (In thousands) At March 31, At December 31, Non-interest-bearing: Demand $ 6,680,114 $ 6,155,592 Interest-bearing: Health savings accounts 7,455,181 7,120,017 Checking 3,792,309 3,652,763 Money market 3,015,565 2,940,215 Savings 5,304,532 4,979,031 Time deposits 2,234,133 2,487,818 Total interest-bearing $ 21,801,720 $ 21,179,844 Total deposits $ 28,481,834 $ 27,335,436 Time deposits and interest-bearing checking obtained through brokers (included in above balances) $ 754,159 $ 720,440 Time deposits that exceed the FDIC limit (included in above balance) 389,513 504,543 Deposit overdrafts reclassified as loan balances 973 2,007 The scheduled maturities of time deposits are as follows: (In thousands) At March 31, Remainder of 2021 $ 1,725,839 2022 335,674 2023 82,122 2024 32,259 2025 51,347 Thereafter 6,892 Total time deposits $ 2,234,133

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Borrowings	Borrowings Total borrowings of $1.2 billion at March 31, 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 March 31, 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 $ 298,378 0.11 % $ 269,330 0.13 % Original maturity of greater than one year, non-callable 200,000 1.53 200,000 0.84 Total securities sold under agreements to repurchase 498,378 0.68 469,330 0.43 Fed funds purchased — — 526,025 0.08 Securities sold under agreements to repurchase and other borrowings $ 498,378 0.68 $ 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 March 31, 2021 At December 31, 2020 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 25,000 0.35 % $ 25,000 0.38 % After 1 but within 2 years 105 — 110 — After 2 but within 3 years 212 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 13,237 2.56 7,839 2.66 FHLB advances $ 138,554 1.40 $ 133,164 1.36 Aggregate carrying value of assets pledged as collateral $ 7,239,063 $ 7,387,054 Remaining borrowing capacity 4,451,005 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 March 31, 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) 342,826 344,164 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total notes and subordinated debt 570,146 571,484 Discount on senior fixed-rate notes (1,138) (1,193) Debt issuance cost on senior fixed-rate notes (2,528) (2,628) Long-term debt $ 566,480 $ 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 3.13% at March 31, 2021 and 3.18% at December 31, 2020.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income, Net of Tax	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ 67,424 $ 19,918 $ (45,086) $ 42,256 Other comprehensive (loss) before reclassifications (30,353) (5,170) — (35,523) Amounts reclassified from accumulated other comprehensive income (loss) — 798 743 1,541 Net current-period other comprehensive (loss) income, net of tax (30,353) (4,372) 743 (33,982) Ending balance $ 37,071 $ 15,546 $ (44,343) $ 8,274 Three months ended March 31, 2020 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ 17,251 $ (9,184) $ (44,139) $ (36,072) Other comprehensive (loss) income before reclassifications (15,683) 24,779 — 9,096 Amounts reclassified from accumulated other comprehensive income (loss) (6) 1,453 729 2,176 Net current-period other comprehensive (loss) income, net of tax (15,689) 26,232 729 11,272 Ending balance $ 1,562 $ 17,048 $ (43,410) $ (24,800) The following table further details the amounts reclassified from accumulated other comprehensive income (loss): (In thousands) Three months ended March 31, Associated Line Item on the Condensed Consolidated Statements of Income AOCI (AOCL) Component 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 $ (1,005) $ (1,173) Interest expense Premium amortization (76) (794) Interest income Tax benefit 283 514 Income tax expense Net of tax $ (798) $ (1,453) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,008) $ (990) Other non-interest expense Tax benefit 265 261 Income tax expense Net of tax $ (743) $ (729)

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 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 March 31, 2021 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,609,103 11.89 % $ 987,539 4.5 % $ 1,426,445 6.5 % Total risk-based capital 3,090,093 14.08 1,755,625 8.0 2,194,531 10.0 Tier 1 risk-based capital 2,754,140 12.55 1,316,718 6.0 1,755,625 8.0 Tier 1 leverage capital 2,754,140 8.45 1,303,595 4.0 1,629,494 5.0 Webster Bank CET1 risk-based capital $ 2,842,608 12.96 % $ 987,127 4.5 % $ 1,425,850 6.5 % Total risk-based capital 3,101,241 14.14 1,754,892 8.0 2,193,616 10.0 Tier 1 risk-based capital 2,842,608 12.96 1,316,169 6.0 1,754,892 8.0 Tier 1 leverage capital 2,842,608 8.73 1,302,964 4.0 1,628,705 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 $60.0 million in dividends to Webster Financial Corporation during the three months ended March 31, 2021, whereas no dividends were paid during the three months ended March 31, 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	3 Months Ended
	Mar. 31, 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 March 31, (In thousands, except per share data) 2021 2020 Earnings for basic and diluted earnings per common share: Net income $ 108,078 $ 38,199 Less: Preferred stock dividends 1,969 1,969 Net income available to common shareholders 106,109 36,230 Less: Earnings applicable to participating securities (1) 579 209 Earnings applicable to common shareholders $ 105,530 $ 36,021 Shares: Weighted-average common shares outstanding - basic 89,809 90,936 Effect of dilutive securities 299 270 Weighted-average common shares outstanding - diluted 90,108 91,206 Earnings per common share (1) : Basic $ 1.18 $ 0.40 Diluted 1.17 0.39 (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.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 32,581 $ 25,000 $ 59 $ 1,000,000 $ 39,641 $ 25,000 $ 103 Not designated as hedging instruments: Interest rate derivatives (1) 4,502,668 187,593 4,306,916 22,762 4,533,441 292,096 4,356,339 11,874 Mortgage banking derivatives (2) 43,494 485 3,303 12 40,771 855 — — Other (3) 100,907 296 381,546 192 108,987 264 360,497 377 Total not designated as hedging instruments 4,647,069 188,374 4,691,765 22,966 4,683,199 293,215 4,716,836 12,251 Gross derivative instruments, before netting $ 5,647,069 220,955 $ 4,716,765 23,025 $ 5,683,199 332,856 $ 4,741,836 12,354 Less: Master netting agreements 3,082 3,082 7,522 7,522 Cash collateral 39,973 2,701 33,043 4,485 Total derivative instruments, after netting $ 177,900 $ 17,242 $ 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 $0.3 billion and $0.1 billion for asset derivatives and $3.0 billion and $3.2 billion for liability derivatives at March 31, 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 $1.1 million at March 31, 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 $82.7 million and $80.5 million for asset derivatives and $368.4 million and $338.9 million for liability derivatives at March 31, 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 March 31, 2021 (In thousands) Gross Offset Amount Net Amount on Balance Sheet Amounts Not Offset Net Amounts Asset derivatives $ 43,092 $ 43,055 $ 37 $ 266 $ 303 Liability derivatives 5,783 5,783 — 727 727 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 March 31, (In thousands) Net Interest Income 2021 2020 Interest rate derivatives Long-term debt $ 121 $ 1,121 Interest rate derivatives Interest and fees on loans and leases (2,582) 740 Net recognized on cash flow hedges $ (2,461) $ 1,861 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 March 31, At December 31, At March 31, At December 31, Long-term debt $ 342,826 $ 344,164 $ 42,826 $ 44,164 The following table presents the effect on the income statement for derivatives not designated as hedging instruments: Recognized In Three months ended March 31, (In thousands) Non-interest Income 2021 2020 Interest rate derivatives Other income $ 4,644 $ 5,926 Mortgage banking derivatives Mortgage banking activities (382) (993) Other Other income 472 1,911 Total not designated as hedging instruments $ 4,734 $ 6,844 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 March 31, 2021, the remaining unamortized balance of time-value premiums was $9.4 million. Over the next twelve months, an estimated $10.3 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 March 31, 2021, the remaining unamortized loss on terminated cash flow hedges is $0.9 million. The maximum length of time over which forecasted transactions are hedged is 3.3 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 March 31, 2021, the Company had $75.9 million in initial margin collateral posted at CME. In addition, $40.7 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 $182.3 million at March 31, 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 $39.6 million at March 31, 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	3 Months Ended
	Mar. 31, 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 March 31, 2021 At December 31, 2020 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 17,260 $ 17,024 $ 236 $ 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 March 31, 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 March 31, 2021, these alternative investments had a remaining unfunded commitment of $18.7 million. A summary of the financial assets and liabilities measured at fair value on a recurring basis is as follows: At March 31, 2021 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: Agency CMO $ — $ 137,603 $ — $ 137,603 Agency MBS — 1,456,456 — 1,456,456 Agency CMBS — 974,585 — 974,585 CMBS — 663,013 — 663,013 CLO — 68,643 — 68,643 Corporate debt — 13,680 — 13,680 Total available-for-sale investment securities — 3,313,980 — 3,313,980 Gross derivative instruments, before netting (1) 266 220,689 — 220,955 Originated loans held for sale — 17,260 — 17,260 Investments held in Rabbi Trust 4,845 — — 4,845 Alternative investments (2) — — — 15,896 Total financial assets held at fair value $ 5,111 $ 3,551,929 $ — $ 3,572,936 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 98 $ 22,927 $ — $ 23,025 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 March 31, 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 $17.9 million at March 31, 2021. No reductions for impairments or adjustments due to observable price changes were identified during the three months ended March 31, 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 $2.4 million at March 31, 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 $19.3 million at March 31, 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. The Company recorded a $191 thousand and a $575 thousand charge to the valuation allowance for the three months ended March 31, 2021 and 2020, respectively. 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 March 31, 2021 At December 31, 2020 (In thousands) Carrying Fair Carrying Fair Assets: Level 2 Held-to-maturity investment securities, net $ 5,567,785 $ 5,730,726 $ 5,567,889 $ 5,835,364 Level 3 Loans and leases, net 20,973,032 21,085,680 21,281,784 21,413,397 Mortgage servicing assets 12,327 16,102 13,422 14,362 Liabilities: Level 2 Deposit liabilities $ 26,247,701 $ 26,247,701 $ 24,847,618 $ 24,847,618 Time deposits 2,234,133 2,237,004 2,487,818 2,494,601 Securities sold under agreements to repurchase and other borrowings 498,378 505,387 995,355 1,000,189 FHLB advances 138,554 142,467 133,164 139,035 Long-term debt (1) 566,480 522,850 567,663 538,407 (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	3 Months Ended
	Mar. 31, 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 March 31, 2021 2020 (In thousands) Pension Plan SERP Other Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 1,166 $ 7 $ 4 $ 1,675 $ 11 $ 13 Expected return on plan assets (3,595) — — (3,380) — — Recognized net loss (gain) 1,019 8 (20) 992 6 (9) Net periodic benefit (income) cost $ (1,410) $ 15 $ (16) $ (713) $ 17 $ 4 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 months ended March 31, 2021 was 5.50%, as determined at the beginning of the fiscal year.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 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, the type of customer served, how products and services are provided, and how discrete financial information is evaluated. 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. Also, the previously reported Community Banking segment was 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 March 31, 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 $ 14,602,793 $ 83,707 $ 7,514,326 $ 11,058,211 $ 33,259,037 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 March 31, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 142,038 $ 42,109 $ 88,813 $ (49,196) $ 223,764 Non-interest income 25,177 27,005 16,071 8,504 76,757 Non-interest expense 64,836 36,250 76,124 10,772 187,982 Pre-tax, pre-provision net revenue 102,379 32,864 28,760 (51,464) 112,539 Provision for credit losses (19,373) — (6,386) 9 (25,750) Income before income tax expense 121,752 32,864 35,146 (51,473) 138,289 Income tax expense 30,803 8,775 7,732 (17,099) 30,211 Net income $ 90,949 $ 24,089 $ 27,414 $ (34,374) $ 108,078 Three months ended March 31, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 117,587 $ 42,673 $ 81,199 $ (10,658) $ 230,801 Non-interest income 22,416 26,383 18,443 6,136 73,378 Non-interest expense 65,221 37,078 80,290 (3,753) 178,836 Pre-tax, pre-provision net revenue 74,782 31,978 19,352 (769) 125,343 Provision for credit losses 69,018 — 7,067 (85) 76,000 Income before income tax expense 5,764 31,978 12,285 (684) 49,343 Income tax expense 1,406 8,538 2,678 (1,478) 11,144 Net income $ 4,358 $ 23,440 $ 9,607 $ 794 $ 38,199

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 4,101 $ 25,018 $ 11,303 $ 47 $ 40,469 Wealth and investment services 9,412 — — (9) 9,403 Other 302 1,987 246 — 2,535 Revenue from contracts with customers 13,815 27,005 11,549 38 52,407 Other sources of non-interest income 11,362 — 4,522 8,466 24,350 Total non-interest income $ 25,177 $ 27,005 $ 16,071 $ 8,504 $ 76,757 Three months ended March 31, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 3,911 $ 24,842 $ 13,740 $ 77 $ 42,570 Wealth and investment services 8,746 — — (7) 8,739 Other 256 1,541 61 — 1,858 Revenue from contracts with customers 12,913 26,383 13,801 70 53,167 Other sources of non-interest income 9,503 — 4,642 6,066 20,211 Total non-interest income $ 22,416 $ 26,383 $ 18,443 $ 6,136 $ 73,378 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	3 Months Ended
	Mar. 31, 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 March 31, At December 31, 2020 Commitments to extend credit $ 6,483,939 $ 6,517,840 Standby letters of credit 213,282 207,201 Commercial letters of credit 48,111 30,522 Total credit-related financial instruments with off-balance sheet risk $ 6,745,332 $ 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 March 31, (In thousands) 2021 2020 Beginning balance $ 12,755 $ 2,367 Adoption of ASU No. 2016-13 (CECL) — 9,139 Provision (benefit) 45 (1,422) Ending balance $ 12,800 $ 10,084

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 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, March 31, 2021, through the date of issuance, and determined that, except for the pending merger discussed in Note 3: Business Developments, no other significant events were identified requiring recognition or disclosure.

Business Developments

Business Developments	3 Months Ended
	Mar. 31, 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 for total consideration of approximately $5.1 billion. 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 satisfaction of customary closing conditions, including receipt of required regulatory approvals and approval by the shareholders of each company. 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 months ended March 31, 2021: (In thousands) Severance ROU Asset Other Total Beginning balance $ 17,675 $ — $ 2,120 $ 19,795 Charged to earnings 2,060 179 7,202 9,441 Charged against assets — (179) (1,634) (1,813) Cash payments (1,365) — (3,143) (4,508) Ending balance $ 18,370 $ — $ 4,545 $ 22,915 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)	3 Months Ended
	Mar. 31, 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. 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 had an immaterial effect on the Company's consolidated financial statements. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.
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 March 31, 2021.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 74,319 $ 1,494 $ (97) $ 75,716 $ — $ 74,319 Agency MBS 2,365,314 104,626 (4,824) 2,465,116 — 2,365,314 Agency CMBS 2,182,794 28,832 (22,872) 2,188,754 — 2,182,794 Municipal bonds and notes 735,969 49,669 — 785,638 308 735,661 CMBS 209,697 5,805 — 215,502 — 209,697 Held-to-maturity securities $ 5,568,093 $ 190,426 $ (27,793) $ 5,730,726 $ 308 $ 5,567,785 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 $17.3 million and $22.1 million at March 31, 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 March 31, (In thousands) 2021 2020 Balance beginning of period $ 299 $ — Adoption of ASU No. 2016-13 (CECL) — 397 Provision (benefit) for credit losses 9 (85) Balance end of period $ 308 $ 312 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Baa2 Not Rated Agency CMOs $ — $ 74,319 $ — $ — $ — $ — $ — $ — $ — Agency MBS — 2,365,315 — — — — — — — Agency CMBS — 2,182,794 — — — — — — — Municipal bonds and notes 208,995 125,355 240,215 114,328 33,225 8,471 2,066 190 3,123 CMBS 209,697 — — — — — — — — Total held-to-maturity $ 418,692 $ 4,747,783 $ 240,215 $ 114,328 $ 33,225 $ 8,471 $ 2,066 $ 190 $ 3,123 The amortized cost and fair value of held-to-maturity debt securities presented by contractual maturity are set forth below: At March 31, 2021 (In thousands) Amortized Fair Due in one year or less $ 380 $ 382 Due after one year through five years 4,160 4,384 Due after five years through ten years 288,056 297,857 Due after ten years 5,275,497 5,428,103 Total held-to-maturity debt securities $ 5,568,093 $ 5,730,726
Debt Securities, Available-for-sale	A summary of the amortized cost and fair value of available-for-sale securities is presented below: At March 31, 2021 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value (2) Agency CMO $ 132,613 $ 5,109 $ (119) $ 137,603 Agency MBS 1,408,543 55,423 (7,510) 1,456,456 Agency CMBS 975,433 9,819 (10,667) 974,585 CMBS 662,805 1,193 (985) 663,013 CLO 68,700 12 (69) 68,643 Corporate debt 14,563 6 (889) 13,680 Available-for-sale securities $ 3,262,657 $ 71,562 $ (20,239) $ 3,313,980 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 $7.1 million and $7.5 million at March 31, 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, 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 March 31, 2021 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized # of Fair Unrealized Agency CMO $ 11,083 $ (69) $ 4,336 $ (50) 4 $ 15,419 $ (119) Agency MBS 205,383 (7,362) 8,853 (148) 44 214,236 (7,510) Agency CMBS 466,547 (10,667) — — 13 466,547 (10,667) CMBS 224,636 (547) 185,198 (438) 33 409,834 (985) CLO 24,997 (3) 24,934 (66) 2 49,931 (69) Corporate debt — — 9,405 (889) 2 9,405 (889) Available-for-sale in unrealized loss position $ 932,646 $ (18,648) $ 232,726 $ (1,591) 98 $ 1,165,372 $ (20,239) 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 March 31, 2021 (In thousands) Amortized Fair Due in one year or less $ — $ — Due after one year through five years 1,307 1,348 Due after five through ten years 226,061 226,260 Due after ten years 3,035,289 3,086,372 Total available-for-sale debt securities $ 3,262,657 $ 3,313,980

Loans and Leases (Tables)

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 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 March 31, At December 31, 2020 Commercial non-mortgage $ 6,918,626 $ 7,085,076 Asset-based 907,421 890,598 Commercial real estate 6,338,056 6,322,637 Equipment financing 611,440 602,224 Commercial portfolio 14,775,543 14,900,535 Residential 4,668,945 4,782,016 Home equity 1,724,599 1,802,865 Other consumer 132,296 155,799 Consumer portfolio 6,525,840 6,740,680 Loans and leases (1) (2) (3) $ 21,301,383 $ 21,641,215 (1) Loan balances include net deferred (fees)/costs and net (premiums)/discounts of $(20.1) million and $(10.5) million at March 31, 2021 and December 31, 2020, respectively. (2) At March 31, 2021, the Company had pledged $7.6 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 $58.5 million and $57.8 million at March 31, 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 March 31, 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 $ 1,460 $ 135 $ 50 $ 53,871 $ 55,516 $ 6,863,110 $ 6,918,626 Asset-based — — — 2,402 2,402 905,019 907,421 Commercial real estate 508 197 — 13,752 14,457 6,323,599 6,338,056 Equipment financing 5,778 37 — 6,080 11,895 599,545 611,440 Commercial portfolio 7,746 369 50 76,105 84,270 14,691,273 14,775,543 Residential 4,079 1,186 — 42,768 48,033 4,620,912 4,668,945 Home equity 4,514 1,371 — 30,892 36,777 1,687,822 1,724,599 Other consumer 510 657 — 596 1,763 130,533 132,296 Consumer portfolio 9,103 3,214 — 74,256 86,573 6,439,267 6,525,840 Total $ 16,849 $ 3,583 $ 50 $ 150,361 $ 170,843 $ 21,130,540 $ 21,301,383 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 March 31, 2021 At December 31, 2020 (In thousands) Non-accrual Non-accrual With No Allowance Non-accrual Non-accrual With No Allowance Commercial non-mortgage $ 53,871 $ 10,635 $ 64,073 $ 16,985 Asset-based 2,402 2,402 2,594 — Commercial real estate 13,752 554 21,231 15,529 Equipment financing 6,080 2,758 7,299 2,983 Commercial portfolio 76,105 16,349 95,197 35,497 Residential 42,768 31,274 41,081 29,843 Home equity 30,892 23,370 31,030 24,091 Other consumer 596 38 652 2 Consumer portfolio 74,256 54,682 72,763 53,936 Total $ 150,361 $ 71,031 $ 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 March 31, 2021 At or for the three months ended March 31, 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 (23,653) (2,106) (25,759) 71,243 4,842 76,085 Charge-offs (6,321) (2,974) (9,295) (5,574) (4,587) (10,161) Recoveries 1,636 2,338 3,974 564 1,779 2,343 Balance, end of period $ 283,906 $ 44,445 $ 328,351 $ 261,926 $ 73,005 $ 334,931 Individually evaluated for impairment 14,809 4,913 19,722 8,235 4,777 13,012 Collectively evaluated for impairment $ 269,097 $ 39,532 $ 308,629 $ 253,691 $ 68,228 $ 321,919 Loan and lease balances: Individually evaluated for impairment $ 149,145 $ 140,066 $ 289,211 $ 177,012 $ 155,105 $ 332,117 Collectively evaluated for impairment 14,626,398 6,385,774 21,012,172 13,511,409 7,047,998 20,559,407 Loans and leases $ 14,775,543 $ 6,525,840 $ 21,301,383 $ 13,688,421 $ 7,203,103 $ 20,891,524 The following table provides a summary of activity in the allowance for credit losses on unfunded loan commitments: Three months ended March 31, (In thousands) 2021 2020 Beginning balance $ 12,755 $ 2,367 Adoption of ASU No. 2016-13 (CECL) — 9,139 Provision (benefit) 45 (1,422) Ending balance $ 12,800 $ 10,084
Impaired Loans	The following table summarizes individually assessed loans and leases: At March 31, 2021 (In thousands) Unpaid Amortized Cost Amortized Cost No Allowance Amortized Cost With Allowance Related Commercial non-mortgage $ 149,125 $ 114,352 $ 55,091 $ 59,261 $ 11,345 Asset-based 2,499 2,402 2,402 — — Commercial real estate 30,005 26,311 10,466 15,845 2,548 Equipment financing 6,566 6,080 2,758 3,322 916 Residential 98,331 92,517 56,710 35,807 2,940 Home equity 53,155 46,953 33,299 13,654 1,764 Other consumer 604 596 38 558 209 Total $ 340,285 $ 289,211 $ 160,764 $ 128,447 $ 19,722 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 March 31, 2021 2020 (In thousands) Average Accrued Cash Basis Interest Income Average Accrued Cash Basis Interest Income Commercial non-mortgage $ 117,118 $ 859 $ — $ 122,835 $ 1,053 $ — Asset-based 2,498 — — 138 — — Commercial real estate 30,095 182 — 23,903 146 — Equipment financing 6,689 — — 7,192 — — Residential 95,339 639 273 97,778 830 630 Home equity 46,951 222 214 41,902 391 830 Other consumer 625 — — 512 17 — Total $ 299,315 $ 1,902 $ 487 $ 294,260 $ 2,437 $ 1,460 The following table summarizes whether, or not, individually assessed loans and leases are collateral dependent: At March 31, 2021 At December 31, 2020 (In thousands) Collateral Dependent Not Considered Collateral Dependent Total Collateral Dependent Not Considered Collateral Dependent Total Commercial non-mortgage $ 20,717 $ 93,635 $ 114,352 $ 11,074 $ 108,810 $ 119,884 Asset-based 2,402 — 2,402 2,504 90 2,594 Commercial real estate 21,671 4,640 26,311 28,482 5,397 33,879 Equipment financing — 6,080 6,080 — 7,298 7,298 Residential 36,096 56,421 92,517 33,980 64,184 98,164 Home equity 26,759 20,194 46,953 26,796 20,154 46,950 Other consumer — 596 596 — 653 653 Total amortized cost of CDA $ 107,645 $ 181,566 $ 289,211 $ 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 as of March 31, 2021 and December 31, 2020: At March 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage Pass $ 832,940 $ 2,168,628 $ 957,425 $ 794,005 $ 443,935 $ 416,891 $ 846,850 $ 6,460,674 Special mention — 7,430 33,416 63,403 128 19,991 31,380 155,748 Substandard — 71,611 50,013 82,673 27,423 36,782 33,702 302,204 Commercial non-mortgage 832,940 2,247,669 1,040,854 940,081 471,486 473,664 911,932 6,918,626 Asset-based Pass — 25,881 15,711 22,572 10,890 26,675 762,386 864,115 Special mention — — — 750 — — 40,154 40,904 Substandard — — 2,402 — — — — 2,402 Asset-based — 25,881 18,113 23,322 10,890 26,675 802,540 907,421 Commercial real estate Pass 172,136 921,002 1,473,799 1,227,983 519,241 1,655,611 25,038 5,994,810 Special mention — 27 19,569 40,601 37,690 107,235 — 205,122 Substandard — 813 789 21,884 60,794 53,844 — 138,124 Commercial real estate 172,136 921,842 1,494,157 1,290,468 617,725 1,816,690 25,038 6,338,056 Equipment financing Pass 66,283 232,733 127,083 59,846 22,961 54,613 — 563,519 Special mention — 3,435 11,316 5,185 868 1,376 — 22,180 Substandard 921 10,292 4,484 6,148 1,480 2,416 — 25,741 Equipment financing 67,204 246,460 142,883 71,179 25,309 58,405 — 611,440 Commercial portfolio $ 1,072,280 $ 3,441,852 $ 2,696,007 $ 2,325,050 $ 1,125,410 $ 2,375,434 $ 1,739,510 $ 14,775,543 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 as of March 31, 2021 and December 31, 2020: At March 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Residential 800+ $ 78,004 $ 453,272 $ 226,982 $ 51,458 $ 155,714 $ 962,687 $ — $ 1,928,117 740-799 205,938 558,551 221,807 54,091 113,276 591,184 — 1,744,847 670-739 77,109 170,166 102,503 33,129 68,460 303,718 — 755,085 580-669 5,117 16,295 16,945 5,500 11,770 96,122 — 151,749 579 and below — — 31,835 1,363 1,966 53,983 — 89,147 Residential 366,168 1,198,284 600,072 145,541 351,186 2,007,694 — 4,668,945 Home equity 800+ 8,442 32,410 14,380 21,538 14,293 73,450 521,206 685,719 740-799 9,444 31,016 12,578 16,077 9,282 48,763 418,897 546,057 670-739 3,885 12,664 8,083 11,652 8,804 47,326 255,186 347,600 580-669 — 1,299 1,622 2,123 2,360 18,061 78,951 104,416 579 and below 22 326 737 967 802 7,671 30,282 40,807 Home equity 21,793 77,715 37,400 52,357 35,541 195,271 1,304,522 1,724,599 Other consumer 800+ 51 703 1,458 649 250 213 7,717 11,041 740-799 327 2,645 5,498 2,328 775 505 7,955 20,033 670-739 1,948 13,017 26,345 9,072 1,761 444 3,681 56,268 580-669 56 9,495 16,063 6,258 963 232 1,419 34,486 579 and below 53 2,269 4,430 1,804 428 232 1,252 10,468 Other consumer 2,435 28,129 53,794 20,111 4,177 1,626 22,024 132,296 Consumer portfolio 390,396 1,304,128 691,266 218,009 390,904 2,204,591 1,326,546 6,525,840 Commercial portfolio 1,072,280 3,441,852 2,696,007 2,325,050 1,125,410 2,375,434 1,739,510 14,775,543 Loans and leases $ 1,462,676 $ 4,745,980 $ 3,387,273 $ 2,543,059 $ 1,516,314 $ 4,580,025 $ 3,066,056 $ 21,301,383 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 March 31, At December 31, 2020 Accrual status $ 138,379 $ 140,089 Non-accrual status 83,723 95,338 Total TDRs $ 222,102 $ 235,427 Specific reserves for TDRs included in the balance of ACL on loans and leases $ 14,293 $ 12,728 Additional funds committed to borrowers in TDR status 14,606 12,895 The following table provides information on the type of concession for loans modified as TDRs: Three months ended March 31, 2021 2020 Number of Post- Modification Recorded Investment (1) Number of Post- Modification Recorded Investment (1) (Dollars in thousands) Commercial portfolio Extended Maturity 7 $ 690 2 $ 104 Maturity/Rate Combined 1 37 6 552 Other (2) 2 113 10 27,137 Consumer portfolio Extended Maturity 2 127 1 264 Maturity/Rate Combined 5 1,011 4 456 Other (2) 9 666 14 1,726 Total TDRs 26 $ 2,644 37 $ 30,239 (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 March 31, 2021 At December 31, 2020 Pass $ 12,724 $ 12,462 Special Mention — — Substandard 98,175 105,070 Doubtful — 163 Total $ 110,899 $ 117,695

Transfers of Financial Assets (

Transfers of Financial Assets (Tables)	3 Months Ended
	Mar. 31, 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 March 31, (In thousands) 2021 2020 Beginning balance $ 747 $ 508 Provision charged to expense 23 22 (Charge-offs/settlements) recoveries, net — 103 Ending balance $ 770 $ 633
Transfer of Financial Assets Accounted for as Sales	The following table provides information for mortgage banking activities: Three months ended March 31, (In thousands) 2021 2020 Residential mortgage loans held for sale: Proceeds from sale $ 79,308 $ 75,594 Loans sold with servicing rights retained 75,691 72,091 Net gain on sale 2,109 2,519 Ancillary fees 541 401 Fair value option adjustment (8) (27)
Servicing Asset at Amortized Cost	The following table presents the changes in carrying value for mortgage servicing assets: Three months ended March 31, (In thousands) 2021 2020 Beginning balance $ 13,422 $ 17,484 Additions 586 1,189 Amortization (1,490) (1,707) Adjustment to valuation allowance (191) (575) Ending balance $ 12,327 $ 16,391

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Operating Leases Condensed Consolidated Balance Sheet Line Item Location ROU lease assets $ 127,423 Premises and equipment, net Lease liabilities 156,910 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 March 31, (In thousands) 2021 2020 Lease Cost: Operating lease costs $ 6,557 $ 7,424 Variable lease costs 1,300 1,427 Sublease income (131) (145) Total operating lease cost $ 7,726 $ 8,706 Other Information: Cash paid for amounts included in the measurement of lease liabilities $ 7,833 $ 7,758 ROU lease assets obtained in exchange for new operating lease liabilities 5,398 8,666
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The undiscounted scheduled maturities reconciled to total operating lease liabilities are as follows: (In thousands) At March 31, 2021 Remainder of 2021 $ 20,323 2022 27,762 2023 25,259 2024 22,250 2025 20,267 Thereafter 64,364 Total operating lease liability payments 180,225 Less: Present value adjustment 23,315 Lease liabilities $ 156,910 Weighted-average remaining lease term, in years 7.95 Weighted-average discount rate 3.14%

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Other intangible assets by reportable segment consisted of the following: At March 31, 2021 At December 31, 2020 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying HSA Bank - Core deposits $ 26,625 $ 16,352 $ 10,273 $ 26,625 $ 15,618 $ 11,007 HSA Bank - Customer relationships 21,000 10,029 10,971 21,000 9,624 11,376 Total other intangible assets $ 47,625 $ 26,381 $ 21,244 $ 47,625 $ 25,242 $ 22,383
Schedule Of Expected Amortization Expense, Next Four Years	At March 31, 2021, the remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) Remainder of 2021 $ 3,374 2022 4,411 2023 4,315 2024 2,084 2025 2,084 Thereafter 4,976

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2021
Deposit Liabilities [Abstract]
Deposit Liabilities, Type [Table Text Block]	A summary of deposits by type is as follows: (In thousands) At March 31, At December 31, Non-interest-bearing: Demand $ 6,680,114 $ 6,155,592 Interest-bearing: Health savings accounts 7,455,181 7,120,017 Checking 3,792,309 3,652,763 Money market 3,015,565 2,940,215 Savings 5,304,532 4,979,031 Time deposits 2,234,133 2,487,818 Total interest-bearing $ 21,801,720 $ 21,179,844 Total deposits $ 28,481,834 $ 27,335,436 Time deposits and interest-bearing checking obtained through brokers (included in above balances) $ 754,159 $ 720,440 Time deposits that exceed the FDIC limit (included in above balance) 389,513 504,543 Deposit overdrafts reclassified as loan balances 973 2,007
Time Deposit Maturities [Table Text Block]	The scheduled maturities of time deposits are as follows: (In thousands) At March 31, Remainder of 2021 $ 1,725,839 2022 335,674 2023 82,122 2024 32,259 2025 51,347 Thereafter 6,892 Total time deposits $ 2,234,133

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The following table summarizes securities sold under agreements to repurchase and other borrowings: At March 31, 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 $ 298,378 0.11 % $ 269,330 0.13 % Original maturity of greater than one year, non-callable 200,000 1.53 200,000 0.84 Total securities sold under agreements to repurchase 498,378 0.68 469,330 0.43 Fed funds purchased — — 526,025 0.08 Securities sold under agreements to repurchase and other borrowings $ 498,378 0.68 $ 995,355 0.25
Federal Home Loan Bank, Advances	The following table provides information for FHLB advances: At March 31, 2021 At December 31, 2020 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 25,000 0.35 % $ 25,000 0.38 % After 1 but within 2 years 105 — 110 — After 2 but within 3 years 212 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 13,237 2.56 7,839 2.66 FHLB advances $ 138,554 1.40 $ 133,164 1.36 Aggregate carrying value of assets pledged as collateral $ 7,239,063 $ 7,387,054 Remaining borrowing capacity 4,451,005 4,689,642
Schedule of Long-term Debt Instruments	The following table summarizes long-term debt: (Dollars in thousands) At March 31, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 $ 150,000 $ 150,000 4.100% Senior fixed-rate notes due March 25, 2029 (1) 342,826 344,164 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total notes and subordinated debt 570,146 571,484 Discount on senior fixed-rate notes (1,138) (1,193) Debt issuance cost on senior fixed-rate notes (2,528) (2,628) Long-term debt $ 566,480 $ 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 3.13% at March 31, 2021 and 3.18% at December 31, 2020.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income, Net of Tax (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ 67,424 $ 19,918 $ (45,086) $ 42,256 Other comprehensive (loss) before reclassifications (30,353) (5,170) — (35,523) Amounts reclassified from accumulated other comprehensive income (loss) — 798 743 1,541 Net current-period other comprehensive (loss) income, net of tax (30,353) (4,372) 743 (33,982) Ending balance $ 37,071 $ 15,546 $ (44,343) $ 8,274 Three months ended March 31, 2020 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Beginning balance $ 17,251 $ (9,184) $ (44,139) $ (36,072) Other comprehensive (loss) income before reclassifications (15,683) 24,779 — 9,096 Amounts reclassified from accumulated other comprehensive income (loss) (6) 1,453 729 2,176 Net current-period other comprehensive (loss) income, net of tax (15,689) 26,232 729 11,272 Ending balance $ 1,562 $ 17,048 $ (43,410) $ (24,800)
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 March 31, Associated Line Item on the Condensed Consolidated Statements of Income AOCI (AOCL) Component 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 $ (1,005) $ (1,173) Interest expense Premium amortization (76) (794) Interest income Tax benefit 283 514 Income tax expense Net of tax $ (798) $ (1,453) Defined benefit pension and other postretirement benefit plans: Amortization of net loss $ (1,008) $ (990) Other non-interest expense Tax benefit 265 261 Income tax expense Net of tax $ (743) $ (729)

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2021 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,609,103 11.89 % $ 987,539 4.5 % $ 1,426,445 6.5 % Total risk-based capital 3,090,093 14.08 1,755,625 8.0 2,194,531 10.0 Tier 1 risk-based capital 2,754,140 12.55 1,316,718 6.0 1,755,625 8.0 Tier 1 leverage capital 2,754,140 8.45 1,303,595 4.0 1,629,494 5.0 Webster Bank CET1 risk-based capital $ 2,842,608 12.96 % $ 987,127 4.5 % $ 1,425,850 6.5 % Total risk-based capital 3,101,241 14.14 1,754,892 8.0 2,193,616 10.0 Tier 1 risk-based capital 2,842,608 12.96 1,316,169 6.0 1,754,892 8.0 Tier 1 leverage capital 2,842,608 8.73 1,302,964 4.0 1,628,705 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)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share Basic And Diluted	econciliation of the calculation of basic and diluted earnings per common share is as follows: Three months ended March 31, (In thousands, except per share data) 2021 2020 Earnings for basic and diluted earnings per common share: Net income $ 108,078 $ 38,199 Less: Preferred stock dividends 1,969 1,969 Net income available to common shareholders 106,109 36,230 Less: Earnings applicable to participating securities (1) 579 209 Earnings applicable to common shareholders $ 105,530 $ 36,021 Shares: Weighted-average common shares outstanding - basic 89,809 90,936 Effect of dilutive securities 299 270 Weighted-average common shares outstanding - diluted 90,108 91,206 Earnings per common share (1) : Basic $ 1.18 $ 0.40 Diluted 1.17 0.39

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 32,581 $ 25,000 $ 59 $ 1,000,000 $ 39,641 $ 25,000 $ 103 Not designated as hedging instruments: Interest rate derivatives (1) 4,502,668 187,593 4,306,916 22,762 4,533,441 292,096 4,356,339 11,874 Mortgage banking derivatives (2) 43,494 485 3,303 12 40,771 855 — — Other (3) 100,907 296 381,546 192 108,987 264 360,497 377 Total not designated as hedging instruments 4,647,069 188,374 4,691,765 22,966 4,683,199 293,215 4,716,836 12,251 Gross derivative instruments, before netting $ 5,647,069 220,955 $ 4,716,765 23,025 $ 5,683,199 332,856 $ 4,741,836 12,354 Less: Master netting agreements 3,082 3,082 7,522 7,522 Cash collateral 39,973 2,701 33,043 4,485 Total derivative instruments, after netting $ 177,900 $ 17,242 $ 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 $0.3 billion and $0.1 billion for asset derivatives and $3.0 billion and $3.2 billion for liability derivatives at March 31, 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 $1.1 million at March 31, 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 $82.7 million and $80.5 million for asset derivatives and $368.4 million and $338.9 million for liability derivatives at March 31, 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 March 31, 2021 (In thousands) Gross Offset Amount Net Amount on Balance Sheet Amounts Not Offset Net Amounts Asset derivatives $ 43,092 $ 43,055 $ 37 $ 266 $ 303 Liability derivatives 5,783 5,783 — 727 727 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 March 31, (In thousands) Net Interest Income 2021 2020 Interest rate derivatives Long-term debt $ 121 $ 1,121 Interest rate derivatives Interest and fees on loans and leases (2,582) 740 Net recognized on cash flow hedges $ (2,461) $ 1,861 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 March 31, At December 31, At March 31, At December 31, Long-term debt $ 342,826 $ 344,164 $ 42,826 $ 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 March 31, (In thousands) Non-interest Income 2021 2020 Interest rate derivatives Other income $ 4,644 $ 5,926 Mortgage banking derivatives Mortgage banking activities (382) (993) Other Other income 472 1,911 Total not designated as hedging instruments $ 4,734 $ 6,844

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Option, Disclosures	At March 31, 2021 At December 31, 2020 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 17,260 $ 17,024 $ 236 $ 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 March 31, 2021 (In thousands) Level 1 Level 2 Level 3 Total Financial assets held at fair value: Agency CMO $ — $ 137,603 $ — $ 137,603 Agency MBS — 1,456,456 — 1,456,456 Agency CMBS — 974,585 — 974,585 CMBS — 663,013 — 663,013 CLO — 68,643 — 68,643 Corporate debt — 13,680 — 13,680 Total available-for-sale investment securities — 3,313,980 — 3,313,980 Gross derivative instruments, before netting (1) 266 220,689 — 220,955 Originated loans held for sale — 17,260 — 17,260 Investments held in Rabbi Trust 4,845 — — 4,845 Alternative investments (2) — — — 15,896 Total financial assets held at fair value $ 5,111 $ 3,551,929 $ — $ 3,572,936 Financial liabilities held at fair value: Gross derivative instruments, before netting (1) $ 98 $ 22,927 $ — $ 23,025 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 March 31, 2021 At December 31, 2020 (In thousands) Carrying Fair Carrying Fair Assets: Level 2 Held-to-maturity investment securities, net $ 5,567,785 $ 5,730,726 $ 5,567,889 $ 5,835,364 Level 3 Loans and leases, net 20,973,032 21,085,680 21,281,784 21,413,397 Mortgage servicing assets 12,327 16,102 13,422 14,362 Liabilities: Level 2 Deposit liabilities $ 26,247,701 $ 26,247,701 $ 24,847,618 $ 24,847,618 Time deposits 2,234,133 2,237,004 2,487,818 2,494,601 Securities sold under agreements to repurchase and other borrowings 498,378 505,387 995,355 1,000,189 FHLB advances 138,554 142,467 133,164 139,035 Long-term debt (1) 566,480 522,850 567,663 538,407 (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)	3 Months Ended
	Mar. 31, 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 March 31, 2021 2020 (In thousands) Pension Plan SERP Other Pension Plan SERP Other Benefits Interest cost on benefit obligations $ 1,166 $ 7 $ 4 $ 1,675 $ 11 $ 13 Expected return on plan assets (3,595) — — (3,380) — — Recognized net loss (gain) 1,019 8 (20) 992 6 (9) Net periodic benefit (income) cost $ (1,410) $ 15 $ (16) $ (713) $ 17 $ 4

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 14,602,793 $ 83,707 $ 7,514,326 $ 11,058,211 $ 33,259,037 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 March 31, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 142,038 $ 42,109 $ 88,813 $ (49,196) $ 223,764 Non-interest income 25,177 27,005 16,071 8,504 76,757 Non-interest expense 64,836 36,250 76,124 10,772 187,982 Pre-tax, pre-provision net revenue 102,379 32,864 28,760 (51,464) 112,539 Provision for credit losses (19,373) — (6,386) 9 (25,750) Income before income tax expense 121,752 32,864 35,146 (51,473) 138,289 Income tax expense 30,803 8,775 7,732 (17,099) 30,211 Net income $ 90,949 $ 24,089 $ 27,414 $ (34,374) $ 108,078 Three months ended March 31, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Net interest income $ 117,587 $ 42,673 $ 81,199 $ (10,658) $ 230,801 Non-interest income 22,416 26,383 18,443 6,136 73,378 Non-interest expense 65,221 37,078 80,290 (3,753) 178,836 Pre-tax, pre-provision net revenue 74,782 31,978 19,352 (769) 125,343 Provision for credit losses 69,018 — 7,067 (85) 76,000 Income before income tax expense 5,764 31,978 12,285 (684) 49,343 Income tax expense 1,406 8,538 2,678 (1,478) 11,144 Net income $ 4,358 $ 23,440 $ 9,607 $ 794 $ 38,199

Revenue from Contracts with C_2

Revenue from Contracts with Customers Disaggregation of Revenue (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2021 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 4,101 $ 25,018 $ 11,303 $ 47 $ 40,469 Wealth and investment services 9,412 — — (9) 9,403 Other 302 1,987 246 — 2,535 Revenue from contracts with customers 13,815 27,005 11,549 38 52,407 Other sources of non-interest income 11,362 — 4,522 8,466 24,350 Total non-interest income $ 25,177 $ 27,005 $ 16,071 $ 8,504 $ 76,757 Three months ended March 31, 2020 (In thousands) Commercial Banking HSA Bank Retail Banking Corporate and Reconciling Consolidated Total Non-interest Income: Deposit service fees $ 3,911 $ 24,842 $ 13,740 $ 77 $ 42,570 Wealth and investment services 8,746 — — (7) 8,739 Other 256 1,541 61 — 1,858 Revenue from contracts with customers 12,913 26,383 13,801 70 53,167 Other sources of non-interest income 9,503 — 4,642 6,066 20,211 Total non-interest income $ 22,416 $ 26,383 $ 18,443 $ 6,136 $ 73,378

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 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 March 31, At December 31, 2020 Commitments to extend credit $ 6,483,939 $ 6,517,840 Standby letters of credit 213,282 207,201 Commercial letters of credit 48,111 30,522 Total credit-related financial instruments with off-balance sheet risk $ 6,745,332 $ 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 March 31, 2021 At or for the three months ended March 31, 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 (23,653) (2,106) (25,759) 71,243 4,842 76,085 Charge-offs (6,321) (2,974) (9,295) (5,574) (4,587) (10,161) Recoveries 1,636 2,338 3,974 564 1,779 2,343 Balance, end of period $ 283,906 $ 44,445 $ 328,351 $ 261,926 $ 73,005 $ 334,931 Individually evaluated for impairment 14,809 4,913 19,722 8,235 4,777 13,012 Collectively evaluated for impairment $ 269,097 $ 39,532 $ 308,629 $ 253,691 $ 68,228 $ 321,919 Loan and lease balances: Individually evaluated for impairment $ 149,145 $ 140,066 $ 289,211 $ 177,012 $ 155,105 $ 332,117 Collectively evaluated for impairment 14,626,398 6,385,774 21,012,172 13,511,409 7,047,998 20,559,407 Loans and leases $ 14,775,543 $ 6,525,840 $ 21,301,383 $ 13,688,421 $ 7,203,103 $ 20,891,524 The following table provides a summary of activity in the allowance for credit losses on unfunded loan commitments: Three months ended March 31, (In thousands) 2021 2020 Beginning balance $ 12,755 $ 2,367 Adoption of ASU No. 2016-13 (CECL) — 9,139 Provision (benefit) 45 (1,422) Ending balance $ 12,800 $ 10,084

Business Developments (Tables)

Business Developments (Tables)	3 Months Ended
	Mar. 31, 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 months ended March 31, 2021: (In thousands) Severance ROU Asset Other Total Beginning balance $ 17,675 $ — $ 2,120 $ 19,795 Charged to earnings 2,060 179 7,202 9,441 Charged against assets — (179) (1,634) (1,813) Cash payments (1,365) — (3,143) (4,508) Ending balance $ 18,370 $ — $ 4,545 $ 22,915

Variable Interest Entities (Var

Variable Interest Entities (Variable Interest Entity, Consolidated, Carrying Amount, Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 33,259,037	$ 32,590,690
Liabilities	29,986,109	29,356,065
Other Assets [Member] | Tax Credit - Finance Investments | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	36,000	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	9,000
Other Investments [Member] | Other Non-Marketable Investments | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	40,200	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	$ 75,300	$ 72,700

Investments, Debt and Equity Se

Investments, Debt and Equity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	$ 5,568,093	$ 5,568,188
Unrealized Gains	190,426	269,717
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(27,793)	(2,541)
Debt Securities, Held-to-maturity, Fair Value	5,730,726	5,835,364
Allowance for credit losses on investment securities held-to-maturity	308	299	$ 312	$ 0
Net Carrying Value	5,567,785	5,567,889
Interest receivable	58,500	57,800
Held-to-maturity Securities [Member]
Schedule of Investments [Line Items]
Interest receivable	17,300	22,100
Agency CMO [Member]
Schedule of Investments [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	74,319	91,622
Unrealized Gains	1,494	1,785
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(97)	(241)
Debt Securities, Held-to-maturity, Fair Value	75,716	93,166
Allowance for credit losses on investment securities held-to-maturity	0	0
Net Carrying Value	74,319	91,622
Agency MBS [Member]
Schedule of Investments [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	2,365,314	2,419,751
Unrealized Gains	104,626	137,863
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(4,824)	(84)
Debt Securities, Held-to-maturity, Fair Value	2,465,116	2,557,530
Allowance for credit losses on investment securities held-to-maturity	0	0
Net Carrying Value	2,365,314	2,419,751
Agency Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	2,182,794	2,101,227
Unrealized Gains	28,832	60,484
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(22,872)	(2,213)
Debt Securities, Held-to-maturity, Fair Value	2,188,754	2,159,498
Allowance for credit losses on investment securities held-to-maturity	0	0
Net Carrying Value	2,182,794	2,101,227
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	735,969	739,507
Unrealized Gains	49,669	60,371
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	(3)
Debt Securities, Held-to-maturity, Fair Value	785,638	799,875
Allowance for credit losses on investment securities held-to-maturity	308	299
Net Carrying Value	735,661	739,208
Non-agency CMBS [Member]
Schedule of Investments [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	209,697	216,081
Unrealized Gains	5,805	9,214
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	215,502	225,295
Allowance for credit losses on investment securities held-to-maturity	0	0
Net Carrying Value	$ 209,697	$ 216,081

Investments, Debt and Equity _2

Investments, Debt and Equity Securities Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Beginning Balance	$ 299	$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery	9	(85)
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Ending Balance	308	312
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	$ 397

Investment Securities (Summary

Investment Securities (Summary Of Debt Securities Held-to Maturity) (Detail) - USD ($) $ in Thousands	Mar. 31, 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	4,160
Held-to-maturity, Amortized Cost - Due after five through ten years	288,056
Held-to-maturity, Amortized Cost - Due after ten years	5,275,497
Amortized Cost(1)	5,568,093	$ 5,568,188
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held to maturity, Fair Value - Due in one year or less	382
Held-to-maturity, Fair Value - Due after one year through five years	4,384
Held to maturity, Fair Value - Due after five through ten years	297,857
Held to maturity, Fair Value - Due after ten years	5,428,103
Fair Value(2)	5,730,726	5,835,364
Moody's, Aaa Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	418,692
Moody's, Aa1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	4,747,783
Moody's, Aa2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	240,215
Moody's, Aa3 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	114,328
Moody's, A1 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	33,225
Moody's, A2 Rating
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	8,471
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)	3,123
Agency CMO [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	74,319	91,622
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	75,716	93,166
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)	74,319
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)	2,365,314	2,419,751
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	2,465,116	2,557,530
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)	2,365,315
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)	2,182,794	2,101,227
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	2,188,754	2,159,498
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)	2,182,794
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)	735,969	739,507
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	785,638	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)	208,995
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)	125,355
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)	240,215
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)	114,328
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)	33,225
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)	8,471
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)	3,123
Non-agency CMBS [Member]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Amortized Cost(1)	209,697	216,081
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value(2)	215,502	$ 225,295
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)	209,697
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

Investment Securities (Summar_2

Investment Securities (Summary Of Debt Securities Available-for-Sale) (Detail) $ in Thousands	Mar. 31, 2021USD ($)holding	Dec. 31, 2020USD ($)holding
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	$ 3,262,657	$ 3,234,250
Unrealized Gains	71,562	101,997
Unrealized Losses	(20,239)	(9,471)
Investment securities available-for-sale, at fair value	3,313,980	3,326,776
Interest receivable	58,500	57,800
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	932,646	894,628
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(18,648)	(7,699)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	232,726	61,347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,591)	$ (1,772)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	98	88
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,165,372	$ 955,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(20,239)	(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	1,307
Available-for-sale, Amortized Cost - Due after five through ten years	226,061
Available-for-sale, Amortized Cost - Due after ten years	3,035,289
Available-for-sale, Amortized Cost - Total debt securities	3,262,657	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	1,348
Available-for-sale, Fair Value - Due after five through ten years	226,260
Available-for-sale, Fair Value - Due after ten years	3,086,372
Debt Securities, Available-for-sale	3,313,980	3,326,776
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Interest receivable	7,100	7,500
Agency CMO [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	132,613	148,711
Unrealized Gains	5,109	6,000
Unrealized Losses	(119)	(98)
Investment securities available-for-sale, at fair value	137,603	154,613
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	11,083	13,137
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(69)	(49)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	4,336	5,944
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (50)	$ (49)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	4	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 15,419	$ 19,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(119)	(98)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Total debt securities	132,613	148,711
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale	137,603	154,613
Agency MBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	1,408,543	1,389,100
Unrealized Gains	55,423	68,598
Unrealized Losses	(7,510)	(289)
Investment securities available-for-sale, at fair value	1,456,456	1,457,409
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	205,383	33,742
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7,362)	(219)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,853	4,561
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (148)	$ (70)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	44	30
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 214,236	$ 38,303
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(7,510)	(289)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Total debt securities	1,408,543	1,389,100
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale	1,456,456	1,457,409
Agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	975,433	1,092,430
Unrealized Gains	9,819	26,317
Unrealized Losses	(10,667)	(1,514)
Investment securities available-for-sale, at fair value	974,585	1,117,233
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	466,547	376,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(10,667)	(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	13	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 466,547	$ 376,330
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(10,667)	(1,514)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Total debt securities	975,433	1,092,430
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale	974,585	1,117,233
Non-agency CMBS [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	662,805	512,759
Unrealized Gains	1,193	1,082
Unrealized Losses	(985)	(5,823)
Investment securities available-for-sale, at fair value	663,013	508,018
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	224,636	409,591
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(547)	(5,486)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	185,198	23,167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (438)	$ (337)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	33	38
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 409,834	$ 432,758
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(985)	(5,823)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Total debt securities	662,805	512,759
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale	663,013	508,018
CLO [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	68,700	76,693
Unrealized Gains	12	0
Unrealized Losses	(69)	(310)
Investment securities available-for-sale, at fair value	68,643	76,383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	24,997	57,728
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	(265)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	24,934	18,655
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (66)	$ (45)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	2	4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 49,931	$ 76,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(69)	(310)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Total debt securities	68,700	76,693
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale	68,643	76,383
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost(1)	14,563	14,557
Unrealized Gains	6	0
Unrealized Losses	(889)	(1,437)
Investment securities available-for-sale, at fair value	13,680	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	9,405	9,020
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (889)	$ (1,271)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	2	3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 9,405	$ 13,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(889)	(1,437)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Available-for-sale, Amortized Cost - Total debt securities	14,563	14,557
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale	$ 13,680	$ 13,120

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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	3,313,980,000		$ 3,326,776,000
Held-to-maturity securities pledged	2,700,000,000		2,600,000,000
Available-for-sale securities pledged	1,300,000,000		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	13,680,000		$ 13,120,000
Callable [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Investment securities available-for-sale, at fair value	$ 1,400,000,000

Loans and Leases (Detail)

Loans and Leases (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 21,301,383,000	$ 21,641,215,000	$ 20,891,524,000
Unamortized premiums	(20,100,000)	(10,500,000)
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral	7,600,000,000
Interest receivable	58,500,000	57,800,000
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,775,543,000	14,900,535,000	13,688,421,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,918,626,000	7,085,076,000
Commercial Portfolio Segment [Member] | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	907,421,000	890,598,000
Commercial Portfolio Segment [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,338,056,000	6,322,637,000
Commercial Portfolio Segment [Member] | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	611,440,000	602,224,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	6,525,840,000	6,740,680,000	$ 7,203,103,000
Consumer Portfolio Segment [Member] | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,668,945,000	4,782,016,000
Consumer Portfolio Segment [Member] | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,724,599,000	1,802,865,000
Consumer Portfolio Segment [Member] | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 132,296,000	$ 155,799,000

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)
Operating Leased Assets [Line Items]
Total operating lease liability payments	$ 180,225
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	4,000	$ 3,300
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 1,900	1,200
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan	0
Commercial Portfolio Segment [Member] | Equipment financing
Operating Leased Assets [Line Items]
Net Investment in Direct Financing and Sales Type Leases	$ 223,900
Total operating lease liability payments	243,300
Sales-type and Direct Financing Leases, Interest Income	$ 1,900	$ 1,500

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 359,431	$ 209,096
(Benefit) provision	(25,759)	76,085
Charge-offs	(9,295)	(10,161)
Recoveries	3,974	2,343
Balance, end of period	359,431	209,096	$ 328,351	$ 359,431	$ 334,931
ALLL, Individually evaluated for impairment			19,722		13,012
ALLL, Collectively evaluated for impairment			308,629		321,919
Loan and lease balances, Individually evaluated for impairment			289,211		332,117
Loan and lease balances, Collectively evaluated for impairment			21,012,172		20,559,407
Loans and leases			21,301,383	21,641,215	20,891,524
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	57,568		0
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	312,244	161,669
(Benefit) provision	(23,653)	71,243
Charge-offs	(6,321)	(5,574)
Recoveries	1,636	564
Balance, end of period	312,244	161,669	283,906	312,244	261,926
ALLL, Individually evaluated for impairment			14,809		8,235
ALLL, Collectively evaluated for impairment			269,097		253,691
Loan and lease balances, Individually evaluated for impairment			149,145		177,012
Loan and lease balances, Collectively evaluated for impairment			14,626,398		13,511,409
Loans and leases			14,775,543	14,900,535	13,688,421
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	34,024		0
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	47,187	47,427
(Benefit) provision	(2,106)	4,842
Charge-offs	(2,974)	(4,587)
Recoveries	2,338	1,779
Balance, end of period	47,187	47,427	44,445	47,187	73,005
ALLL, Individually evaluated for impairment			4,913		4,777
ALLL, Collectively evaluated for impairment			39,532		68,228
Loan and lease balances, Individually evaluated for impairment			140,066		155,105
Loan and lease balances, Collectively evaluated for impairment			6,385,774		7,047,998
Loans and leases			$ 6,525,840	6,740,680	$ 7,203,103
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	$ 23,544		$ 0

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 170,843,000	$ 200,942,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	50,000	445,000
Financing Receivable, Nonaccrual	150,361,000	167,960,000	$ 167,960,000
Financing Receivable, Not Past Due	21,130,540,000	21,440,273,000
Loans and leases	21,301,383,000	21,641,215,000	20,891,524,000
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	16,849,000	20,005,000
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3,583,000	12,532,000
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	84,270,000	108,765,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	50,000
Financing Receivable, Nonaccrual	76,105,000	95,197,000	95,197,000
Financing Receivable, Not Past Due	14,691,273,000	14,791,770,000
Loans and leases	14,775,543,000	14,900,535,000	13,688,421,000
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	7,746,000	9,293,000
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	369,000	3,830,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		445,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	55,516,000	66,033,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	50,000
Financing Receivable, Nonaccrual	53,871,000	64,073,000	64,073,000
Financing Receivable, Not Past Due	6,863,110,000	7,019,043,000
Loans and leases	6,918,626,000	7,085,076,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,460,000	612,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	135,000	903,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		445,000
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,402,000	3,768,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	2,402,000	2,594,000	2,594,000
Financing Receivable, Not Past Due	905,019,000	886,830,000
Loans and leases	907,421,000	890,598,000
Commercial Portfolio Segment [Member] | Asset-based | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	1,174,000
Commercial Portfolio Segment [Member] | Asset-based | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	14,457,000	24,250,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	13,752,000	21,231,000	21,231,000
Financing Receivable, Not Past Due	6,323,599,000	6,298,387,000
Loans and leases	6,338,056,000	6,322,637,000
Commercial Portfolio Segment [Member] | Commercial real estate | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	508,000	2,400,000
Commercial Portfolio Segment [Member] | Commercial real estate | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	197,000	619,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	11,895,000	14,714,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	6,080,000	7,299,000	7,299,000
Financing Receivable, Not Past Due	599,545,000	587,510,000
Loans and leases	611,440,000	602,224,000
Commercial Portfolio Segment [Member] | Equipment financing | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	5,778,000	5,107,000
Commercial Portfolio Segment [Member] | Equipment financing | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	37,000	2,308,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	86,573,000	92,177,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	74,256,000	72,763,000	72,763,000
Financing Receivable, Not Past Due	6,439,267,000	6,648,503,000
Loans and leases	6,525,840,000	6,740,680,000	7,203,103,000
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	9,103,000	10,712,000
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3,214,000	8,702,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	48,033,000	51,745,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	42,768,000	41,081,000	41,081,000
Financing Receivable, Not Past Due	4,620,912,000	4,730,271,000
Loans and leases	4,668,945,000	4,782,016,000
Consumer Portfolio Segment [Member] | Residential | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	4,079,000	4,334,000
Consumer Portfolio Segment [Member] | Residential | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,186,000	6,330,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	36,777,000	38,301,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	30,892,000	31,030,000	$ 31,030,000
Financing Receivable, Not Past Due	1,687,822,000	1,764,564,000
Loans and leases	1,724,599,000	1,802,865,000
Consumer Portfolio Segment [Member] | Home equity | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	4,514,000	5,500,000
Consumer Portfolio Segment [Member] | Home equity | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,371,000	1,771,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		0
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,763,000	2,131,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0
Financing Receivable, Nonaccrual	596,000	652,000
Financing Receivable, Not Past Due	130,533,000	153,668,000
Loans and leases	132,296,000	155,799,000
Consumer Portfolio Segment [Member] | Other consumer | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	510,000	878,000
Consumer Portfolio Segment [Member] | Other consumer | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 657,000	601,000
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0

Loans and Leases Nonaccrual (De

Loans and Leases Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	$ 150,361	$ 167,960	$ 167,960
Financing Receivable, Nonaccrual, No Allowance	71,031		89,433
Commercial Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	76,105	95,197	95,197
Financing Receivable, Nonaccrual, No Allowance	16,349		35,497
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	53,871	64,073	64,073
Financing Receivable, Nonaccrual, No Allowance	10,635		16,985
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	2,402	2,594	2,594
Financing Receivable, Nonaccrual, No Allowance	2,402		0
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	13,752	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	6,080	7,299	7,299
Financing Receivable, Nonaccrual, No Allowance	2,758		2,983
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	74,256	72,763	72,763
Financing Receivable, Nonaccrual, No Allowance	54,682		53,936
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	42,768	41,081	41,081
Financing Receivable, Nonaccrual, No Allowance	31,274		29,843
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	30,892	$ 31,030	31,030
Financing Receivable, Nonaccrual, No Allowance	23,370		24,091
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual	596		652
Financing Receivable, Nonaccrual, No Allowance	$ 38		$ 2

Loans and Leases (Credit Qualit

Loans and Leases (Credit Quality Indicators) (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 1,462,676,000	$ 5,461,818,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,745,980,000	3,635,131,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,387,273,000	2,728,575,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,543,059,000	1,645,809,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,516,314,000	1,487,739,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,580,025,000	3,453,866,000
Financing Receivable, Revolving	3,066,056,000	3,228,277,000
Loans and leases	21,301,383,000	21,641,215,000	$ 20,891,524,000
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,072,280,000	4,116,181,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,441,852,000	2,781,504,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,696,007,000	2,475,137,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,325,050,000	1,198,615,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,125,410,000	909,133,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,375,434,000	1,584,568,000
Financing Receivable, Revolving	1,739,510,000	1,835,397,000
Loans and leases	14,775,543,000	14,900,535,000	13,688,421,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	832,940,000	2,858,624,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,247,669,000	1,137,847,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,040,854,000	1,035,468,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	940,081,000	518,078,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	471,486,000	255,172,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	473,664,000	255,715,000
Financing Receivable, Revolving	911,932,000	1,024,172,000
Loans and leases	6,918,626,000	7,085,076,000
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	26,344,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,881,000	18,464,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	18,113,000	23,898,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	23,322,000	11,333,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	10,890,000	10,963,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	26,675,000	16,484,000
Financing Receivable, Revolving	802,540,000	783,112,000
Loans and leases	907,421,000	890,598,000
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	172,136,000	966,426,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	921,842,000	1,472,718,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,494,157,000	1,334,949,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,290,468,000	639,091,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	617,725,000	593,209,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,816,690,000	1,288,131,000
Financing Receivable, Revolving	25,038,000	28,113,000
Loans and leases	6,338,056,000	6,322,637,000
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	67,204,000	264,787,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	246,460,000	152,475,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	142,883,000	80,822,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	71,179,000	30,113,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	25,309,000	49,789,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	58,405,000	24,238,000
Financing Receivable, Revolving	0	0
Loans and leases	611,440,000	602,224,000
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	832,940,000	2,771,373,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,168,628,000	1,052,080,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	957,425,000	907,110,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	794,005,000	481,321,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	443,935,000	231,280,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	416,891,000	218,001,000
Financing Receivable, Revolving	846,850,000	936,592,000
Loans and leases	6,460,674,000	6,597,757,000
Commercial Portfolio Segment [Member] | (1) - (6) Pass [Member] | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	26,344,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,881,000	15,960,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,711,000	23,123,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	22,572,000	11,333,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	10,890,000	10,963,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	26,675,000	16,484,000
Financing Receivable, Revolving	762,386,000	741,336,000
Loans and leases	864,115,000	845,543,000
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	172,136,000	965,582,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	921,002,000	1,461,201,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,473,799,000	1,242,322,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,227,983,000	527,931,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	519,241,000	554,630,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,655,611,000	1,165,331,000
Financing Receivable, Revolving	25,038,000	28,113,000
Loans and leases	5,994,810,000	5,945,110,000
Commercial Portfolio Segment [Member] | (1) - (6) Pass [Member] | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	66,283,000	249,370,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	232,733,000	135,263,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	127,083,000	68,092,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	59,846,000	26,433,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	22,961,000	43,469,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	54,613,000	22,879,000
Financing Receivable, Revolving	0	0
Loans and leases	563,519,000	545,506,000
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	32,535,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7,430,000	33,969,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,416,000	62,034,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	63,403,000	435,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	128,000	8,357,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	19,991,000	13,757,000
Financing Receivable, Revolving	31,380,000	38,496,000
Loans and leases	155,748,000	189,583,000
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	775,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	750,000	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	40,154,000	41,687,000
Loans and leases	40,904,000	42,462,000
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	0	27,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27,000	10,385,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	19,569,000	70,704,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	40,601,000	37,539,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	37,690,000	35,617,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	107,235,000	69,832,000
Financing Receivable, Revolving	0	0
Loans and leases	205,122,000	224,104,000
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	7,934,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,435,000	11,043,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,316,000	6,981,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,185,000	1,220,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	868,000	1,577,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,376,000	788,000
Financing Receivable, Revolving	0	0
Loans and leases	22,180,000	29,543,000
Commercial Portfolio Segment [Member] | (8) Substandard [Member] | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	54,716,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	71,611,000	51,798,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	50,013,000	66,324,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	82,673,000	36,159,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	27,423,000	15,535,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	36,782,000	23,957,000
Financing Receivable, Revolving	33,702,000	49,084,000
Loans and leases	302,204,000	297,573,000
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	2,504,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,402,000	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	89,000
Loans and leases	2,402,000	2,593,000
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	817,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	813,000	1,132,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	789,000	21,923,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	21,884,000	73,621,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	60,794,000	2,962,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	53,844,000	52,968,000
Financing Receivable, Revolving	0	0
Loans and leases	138,124,000	153,423,000
Commercial Portfolio Segment [Member] | (8) Substandard [Member] | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	921,000	7,483,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	10,292,000	6,169,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,484,000	5,749,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,148,000	2,460,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,480,000	4,743,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,416,000	571,000
Financing Receivable, Revolving	0	0
Loans and leases	25,741,000	27,175,000
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		163,000
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		163,000
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	390,396,000	1,345,637,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,304,128,000	853,627,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	691,266,000	253,438,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	218,009,000	447,194,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	390,904,000	578,606,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,204,591,000	1,869,298,000
Financing Receivable, Revolving	1,326,546,000	1,392,880,000
Loans and leases	6,525,840,000	6,740,680,000	$ 7,203,103,000
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	366,168,000	1,231,789,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,198,284,000	746,435,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	600,072,000	167,979,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	145,541,000	402,761,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	351,186,000	536,400,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,007,694,000	1,696,652,000
Financing Receivable, Revolving	0	0
Loans and leases	4,668,945,000	4,782,016,000
Consumer Portfolio Segment [Member] | Residential | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	78,004,000	360,336,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	453,272,000	283,755,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	226,982,000	61,048,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	51,458,000	178,849,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	155,714,000	268,044,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	962,687,000	805,537,000
Financing Receivable, Revolving	0	0
Loans and leases	1,928,117,000	1,957,569,000
Consumer Portfolio Segment [Member] | Residential | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	205,938,000	654,973,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	558,551,000	288,173,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	221,807,000	58,249,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	54,091,000	133,416,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	113,276,000	176,286,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	591,184,000	492,720,000
Financing Receivable, Revolving	0	0
Loans and leases	1,744,847,000	1,803,817,000
Consumer Portfolio Segment [Member] | Residential | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	77,109,000	199,329,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	170,166,000	118,620,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	102,503,000	39,125,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	33,129,000	75,375,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	68,460,000	76,666,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	303,718,000	248,268,000
Financing Receivable, Revolving	0	0
Loans and leases	755,085,000	757,383,000
Consumer Portfolio Segment [Member] | Residential | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	5,117,000	17,151,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,295,000	19,389,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,945,000	8,884,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,500,000	11,843,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	11,770,000	12,225,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	96,122,000	96,333,000
Financing Receivable, Revolving	0	0
Loans and leases	151,749,000	165,825,000
Consumer Portfolio Segment [Member] | Residential | 579 and below
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	36,498,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	31,835,000	673,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,363,000	3,278,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,966,000	3,179,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	53,983,000	53,794,000
Financing Receivable, Revolving	0	0
Loans and leases	89,147,000	97,422,000
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	21,793,000	80,991,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	77,715,000	42,078,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	37,400,000	59,221,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	52,357,000	39,022,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	35,541,000	40,738,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	195,271,000	171,626,000
Financing Receivable, Revolving	1,304,522,000	1,369,189,000
Loans and leases	1,724,599,000	1,802,865,000
Consumer Portfolio Segment [Member] | Home equity | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	8,442,000	30,604,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32,410,000	16,567,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	14,380,000	25,205,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	21,538,000	14,439,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	14,293,000	17,192,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	73,450,000	59,956,000
Financing Receivable, Revolving	521,206,000	542,600,000
Loans and leases	685,719,000	706,563,000
Consumer Portfolio Segment [Member] | Home equity | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	9,444,000	34,797,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	31,016,000	13,565,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,578,000	19,715,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,077,000	11,073,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,282,000	12,839,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	48,763,000	43,802,000
Financing Receivable, Revolving	418,897,000	434,271,000
Loans and leases	546,057,000	570,062,000
Consumer Portfolio Segment [Member] | Home equity | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,885,000	13,753,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12,664,000	8,855,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,083,000	10,761,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	11,652,000	10,206,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,804,000	7,318,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	47,326,000	44,025,000
Financing Receivable, Revolving	255,186,000	275,691,000
Loans and leases	347,600,000	370,609,000
Consumer Portfolio Segment [Member] | Home equity | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	1,708,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,299,000	2,172,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,622,000	2,660,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,123,000	2,234,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,360,000	2,316,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18,061,000	16,680,000
Financing Receivable, Revolving	78,951,000	86,126,000
Loans and leases	104,416,000	113,896,000
Consumer Portfolio Segment [Member] | Home equity | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	22,000	129,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	326,000	919,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	737,000	880,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	967,000	1,070,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	802,000	1,073,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,671,000	7,163,000
Financing Receivable, Revolving	30,282,000	30,501,000
Loans and leases	40,807,000	41,735,000
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,435,000	32,857,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	28,129,000	65,114,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	53,794,000	26,238,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	20,111,000	5,411,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,177,000	1,468,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,626,000	1,020,000
Financing Receivable, Revolving	22,024,000	23,691,000
Loans and leases	132,296,000	155,799,000
Consumer Portfolio Segment [Member] | Consumer Loan | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	51,000	2,827,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	703,000	5,725,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,458,000	2,610,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	649,000	658,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	250,000	115,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	213,000	190,000
Financing Receivable, Revolving	7,717,000	7,171,000
Loans and leases	11,041,000	19,296,000
Consumer Portfolio Segment [Member] | Consumer Loan | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	327,000	12,317,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,645,000	21,036,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,498,000	8,925,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,328,000	1,493,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	775,000	457,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	505,000	263,000
Financing Receivable, Revolving	7,955,000	5,119,000
Loans and leases	20,033,000	49,610,000
Consumer Portfolio Segment [Member] | Consumer Loan | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,948,000	14,761,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,017,000	31,952,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	26,345,000	11,843,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,072,000	2,284,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,761,000	665,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	444,000	228,000
Financing Receivable, Revolving	3,681,000	8,403,000
Loans and leases	56,268,000	70,136,000
Consumer Portfolio Segment [Member] | Consumer Loan | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	56,000	2,344,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9,495,000	5,419,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,063,000	2,360,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,258,000	793,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	963,000	194,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	232,000	124,000
Financing Receivable, Revolving	1,419,000	1,570,000
Loans and leases	34,486,000	12,804,000
Consumer Portfolio Segment [Member] | Consumer Loan | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	53,000	608,000
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,269,000	982,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,430,000	500,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,804,000	183,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	428,000	37,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	232,000	215,000
Financing Receivable, Revolving	1,252,000	1,428,000
Loans and leases	$ 10,468,000	$ 3,953,000

Loans and Leases (Impaired Loan

Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 340,285
Amortized Cost	289,211	$ 309,422
Amortized Cost No Allowance	160,764
Amortized Cost With Allowance	128,447
Related Allowance	19,722
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	149,125	172,069
Amortized Cost	114,352	119,884
Amortized Cost No Allowance	55,091	55,742
Amortized Cost With Allowance	59,261	64,142
Related Allowance	11,345	9,665
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,499	2,989
Amortized Cost	2,402	2,594
Amortized Cost No Allowance	2,402	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	30,005	37,177
Amortized Cost	26,311	33,879
Amortized Cost No Allowance	10,466	25,931
Amortized Cost With Allowance	15,845	7,948
Related Allowance	2,548	1,610
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	6,566	7,770
Amortized Cost	6,080	7,298
Amortized Cost No Allowance	2,758	2,983
Amortized Cost With Allowance	3,322	4,315
Related Allowance	916	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	98,331
Amortized Cost	92,517	98,164
Amortized Cost No Allowance	56,710
Amortized Cost With Allowance	35,807
Related Allowance	2,940
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	53,155	109,156
Amortized Cost	46,953	46,950
Amortized Cost No Allowance	33,299	34,335
Amortized Cost With Allowance	13,654	12,615
Related Allowance	1,764	988
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	604	2,381
Amortized Cost	596	653
Amortized Cost No Allowance	38	2
Amortized Cost With Allowance	558	651
Related Allowance	$ 209	$ 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
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 299,315	$ 294,260
Accrued Interest Income	1,902	2,437
Cash Basis Interest Income	487	1,460
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	117,118	122,835
Accrued Interest Income	859	1,053
Cash Basis Interest Income	0	0
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,498	138
Accrued Interest Income	0	0
Cash Basis Interest Income	0	0
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	30,095	23,903
Accrued Interest Income	182	146
Cash Basis Interest Income	0	0
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	6,689	7,192
Accrued Interest Income	0	0
Cash Basis Interest Income	0	0
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	95,339	97,778
Accrued Interest Income	639	830
Cash Basis Interest Income	273	630
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	46,951	41,902
Accrued Interest Income	222	391
Cash Basis Interest Income	214	830
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	625	512
Accrued Interest Income	0	17
Cash Basis Interest Income	$ 0	$ 0

Loans and Leases Impaired Colla

Loans and Leases Impaired Collateral (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 289,211	$ 309,422
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	107,645	102,836
Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	181,566	206,586
Collateral Value
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	147,700	150,300
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	114,352	119,884
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	20,717	11,074
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	93,635	108,810
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,402	2,594
Commercial Portfolio Segment [Member] | Asset-based | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,402	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	26,311	33,879
Commercial Portfolio Segment [Member] | Commercial real estate | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	21,671	28,482
Commercial Portfolio Segment [Member] | Commercial real estate | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	4,640	5,397
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	6,080	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	6,080	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	92,517	98,164
Consumer Portfolio Segment [Member] | Residential | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	36,096	33,980
Consumer Portfolio Segment [Member] | Residential | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	56,421	64,184
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	46,953	46,950
Consumer Portfolio Segment [Member] | Home equity | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	26,759	26,796
Consumer Portfolio Segment [Member] | Home equity | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	20,194	20,154
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	596	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	$ 596	$ 653

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 222,102	$ 235,427
Specific reserves for TDRs included in the balance of ACL on loans and leases	328,351	359,431	$ 334,931	$ 209,096
Additional funds committed to borrowers in TDR status	14,606	12,895
Performing Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	138,379	140,089
Nonperforming Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	83,723	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	$ 14,293	$ 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
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	26	37
Post-Modification Recorded Investment | $	$ 2,644	$ 30,239
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	7	2
Post-Modification Recorded Investment | $	$ 690	$ 104
Commercial Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	1	6
Post-Modification Recorded Investment | $	$ 37	$ 552
Commercial Portfolio Segment [Member] | Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	10
Post-Modification Recorded Investment | $	$ 113	$ 27,137
Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	2	1
Post-Modification Recorded Investment | $	$ 127	$ 264
Consumer Portfolio Segment [Member] | Maturity/Rate Combined [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	5	4
Post-Modification Recorded Investment | $	$ 1,011	$ 456
Consumer Portfolio Segment [Member] | Other [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan	9	14
Post-Modification Recorded Investment | $	$ 666	$ 1,726

Loans and Leases (Investments i

Loans and Leases (Investments in TDRs, Segregated by Risk Rating Exposure) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 222,102	$ 235,427
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	110,899	117,695
Commercial Portfolio Segment [Member] | (1) - (6) Pass [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	12,724	12,462
Commercial Portfolio Segment [Member] | (7) Special Mention [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	0	0
Commercial Portfolio Segment [Member] | (8) Substandard [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	98,175	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
	Mar. 31, 2021	Mar. 31, 2020
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Beginning balance	$ 747	$ 508
Provision charged to expense	23	22
(Charge-offs/settlements) recoveries, net	0	103
Ending balance	$ 770	$ 633

Transfers of Financial Assets_3

Transfers of Financial Assets (Loans sold) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale	$ 2,642	$ 2,893
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ancillary fees	541	401
Consumer Portfolio Segment [Member] | Residential Mortgage Loans Servicing Retained [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	75,691	72,091
Consumer Portfolio Segment [Member] | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	79,308	75,594
Net gain on sale	2,109	2,519
Fair value option adjustment	$ (8)	$ (27)

Transfers of Financial Assets_4

Transfers of Financial Assets (Mortgage Servicing Assets) (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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	$ 16,787	$ 390
Mortgage banking activities	2,642	2,893
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	16,800
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		400
Mortgage banking activities	191
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	2,109	2,519
Retained servicing rights	2,200,000		$ 2,200,000
Contractually Specified Servicing Fees, Amount	$ 400	$ 500

Transfers of Financial Assets S

Transfers of Financial Assets Servicing Assets at Amortized Cost Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning Balance	$ 13,422	$ 17,484
Additions	586	1,189
Amortization	(1,490)	(1,707)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	(191)	(575)
Ending Balance	$ 12,327	$ 16,391

Leases Lessee Accounting (Detai

Leases Lessee Accounting (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 127,423
Less: Present value adjustment	$ 156,910	$ 158,280

Leases Lessee Cost (Details)

Leases Lessee Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lease, Cost [Abstract]
Operating lease costs	$ 6,557	$ 7,424
Variable lease costs	1,300	1,427
Sublease income	(131)	(145)
Total operating lease cost	7,726	8,706
Cash paid for amounts included in the measurement of lease liabilities	7,833	7,758
ROU lease assets obtained in exchange for new operating lease liabilities	$ 5,398	$ 8,666
Weighted-average remaining lease term, in years	7 years 11 months 12 days
Weighted-average discount rate	3.14%

Leases Operating Lease Liabilit

Leases Operating Lease Liabilities, Payments, Due, Rolling Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract]
Remainder of 2021	$ 20,323
2022	27,762
2023	25,259
2024	22,250
2025	20,267
Thereafter	64,364
Total operating lease liability payments	180,225
Less: Present value adjustment	156,910	$ 158,280
Lease liabilities	$ 23,315

Leases (Details)

Leases (Details)	Mar. 31, 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	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 47,625	$ 47,625
Accumulated Amortization	26,381	25,242
Net Carrying Amount	21,244	22,383
Core Deposits [Member] | HSA Bank
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,625	26,625
Accumulated Amortization	16,352	15,618
Net Carrying Amount	10,273	11,007
Customer Relationships [Member] | HSA Bank
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,000	21,000
Accumulated Amortization	10,029	9,624
Net Carrying Amount	$ 10,971	$ 11,376

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Mar. 31, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 3,374
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	Mar. 31, 2021	Dec. 31, 2020
Non-interest-bearing:
Demand	$ 6,680,114	$ 6,155,592
Interest-bearing:
HSA	7,455,181	7,120,017
Checking	3,792,309	3,652,763
Money market	3,015,565	2,940,215
Savings	5,304,532	4,979,031
Time deposits	2,234,133	2,487,818
Total interest-bearing	21,801,720	21,179,844
Total deposits	28,481,834	27,335,436
Time deposits and interest-bearing checking obtained through brokers (included in above balances)	754,159	720,440
Time deposits that exceed the FDIC limit (included in above balance)	389,513	504,543
Deposit overdrafts reclassified as loan balances	$ 973	$ 2,007

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposit Liabilities [Abstract]
Remainder of 2021	$ 1,725,839
2022	335,674
2023	82,122
2024	32,259
2025	51,347
Thereafter	6,892
Time deposits	$ 2,234,133	$ 2,487,818

Borrowings Borrowings - (Narrat

Borrowings Borrowings - (Narrative) (Details) - USD ($) $ in Billions	Mar. 31, 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	Mar. 31, 2021	Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 1,200,000	$ 1,700,000
Financing Receivable, Originated in Current Fiscal Year	1,462,676	5,461,818
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,745,980	3,635,131
Commercial Portfolio Segment [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,072,280	4,116,181
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,441,852	2,781,504
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Assets Sold under Agreements to Repurchase [Line Items]
Financing Receivable, Originated in Current Fiscal Year	832,940	2,858,624
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,247,669	1,137,847
Commercial Portfolio Segment [Member] | Commercial non-mortgage | (1) - (6) Pass [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financing Receivable, Originated in Current Fiscal Year	832,940	2,771,373
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,168,628	1,052,080
Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 498,378	$ 469,330
Rate	0.68%	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	$ 498,378	$ 995,355
Rate	0.68%	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	$ 298,378	$ 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	1.53%	0.84%

Borrowings Borrowings (Summary

Borrowings Borrowings (Summary Of Advances Payable To the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Mar. 31, 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	105	110
FHLB advances maturing after 2 but within 3 years, Total Outstanding	212	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	13,237	7,839
Federal Home Loan Bank, Advances	$ 138,554	$ 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)	0.35%	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)	1.40%	1.36%
Aggregate carrying value of assets pledged as collateral	$ 7,239,063	$ 7,387,054
Remaining borrowing capacity	$ 4,451,005	$ 4,689,642

Borrowings (Long Term Debt) (De

Borrowings (Long Term Debt) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Notes and subordinated debt	$ 570,146,000	$ 571,484,000
Debt issuance cost on senior fixed-rates	(2,528,000)	(2,628,000)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	342,826,000	344,164,000
Long-term debt	$ 566,480,000	$ 567,663,000
Variable interest rate	3.13%	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	$ (1,138,000)	$ (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	$ 342,826,000	344,164,000
Long-term Debt [Member]
Debt Instrument [Line Items]
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 42,826,000	$ 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
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 3,234,625	$ 3,207,770
Net current-period other comprehensive (loss) income, net of tax	(33,982)	11,272
Ending Balance	3,272,928	3,090,242
Available For Sale and Transferred Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	67,424	17,251
Other comprehensive (loss) before reclassifications	(30,353)	(15,683)
Amounts reclassified from accumulated other comprehensive income (loss)	0	(6)
Net current-period other comprehensive (loss) income, net of tax	(30,353)	(15,689)
Ending Balance	37,071	1,562
Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	19,918	(9,184)
Other comprehensive (loss) before reclassifications	(5,170)	24,779
Amounts reclassified from accumulated other comprehensive income (loss)	798	1,453
Net current-period other comprehensive (loss) income, net of tax	(4,372)	26,232
Ending Balance	15,546	17,048
Defined Benefit Pension and Other Postretirement Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(45,086)	(44,139)
Other comprehensive (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	743	729
Net current-period other comprehensive (loss) income, net of tax	743	729
Ending Balance	(44,343)	(43,410)
Accumulated Other Comprehensive Income, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	42,256	(36,072)
Other comprehensive (loss) before reclassifications	(35,523)	9,096
Amounts reclassified from accumulated other comprehensive income (loss)	1,541	2,176
Net current-period other comprehensive (loss) income, net of tax	(33,982)	11,272
Ending Balance	$ 8,274	$ (24,800)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (30,211)	$ (11,144)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0	(2)
Net of tax	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	8
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(798)	(1,453)
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	283	514
Net of tax	(798)	(1,453)
Other Nonoperating Expense	(1,005)	(1,173)
Interest Income, Other	(76)	(794)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1,008)	(990)
Defined benefit pension and postretirement benefit plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(743)	(729)
Income tax expense	$ 265	$ 261

Regulatory Matters (Information

Regulatory Matters (Information On The Capital Ratios) (Detail)	3 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 2,609,103,000		$ 2,543,131,000
Common Equity Tier One Capital Ratio	0.1189		0.1135
Common Equity Tier One Capital Required for Capital Adequacy	$ 987,539,000		$ 1,008,512,000
Common Equity Tier One Capital Required to be Well-Capitalized	1,426,445,000		1,456,739,000
Total risk-based capital, Actual Amount	$ 3,090,093,000		$ 3,045,652,000
Total risk-based capital, Actual Ratio	0.1408		0.1359
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,755,625,000		$ 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	$ 2,194,531,000		$ 2,241,137,000
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100
Tier 1 capital, Actual Amount	$ 2,754,140,000		$ 2,688,168,000
Tier 1 capital, Actual Ratio	0.1255		0.1199
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,316,718,000		$ 1,344,682,000
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,755,625,000		$ 1,792,910,000
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 2,754,140,000		$ 2,688,168,000
Tier 1 leverage capital ratio, Actual Ratio	0.0845		0.0832
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 1,303,595,000		$ 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	$ 1,629,494,000		$ 1,614,975,000
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		0.050
Dividends paid	$ 60,000,000	$ 0
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 2,842,608,000		$ 2,791,474,000
Common Equity Tier One Capital Ratio	0.1296		0.1246
Common Equity Tier One Capital Required for Capital Adequacy	$ 987,127,000		$ 1,008,027,000
Common Equity Tier One Capital Required to be Well-Capitalized	1,425,850,000		1,456,039,000
Total risk-based capital, Actual Amount	$ 3,101,241,000		$ 3,071,505,000
Total risk-based capital, Actual Ratio	0.1414		0.1371
Total risk-based capital, Capital Requirements, Minimum Amount	$ 1,754,892,000		$ 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	$ 2,193,616,000		$ 2,240,060,000
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100
Tier 1 capital, Actual Amount	$ 2,842,608,000		$ 2,791,474,000
Tier 1 capital, Actual Ratio	0.1296		0.1246
Tier 1 capital, Capital Requirements, Minimum Amount	$ 1,316,169,000		$ 1,344,036,000
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 1,754,892,000		$ 1,792,048,000
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 2,842,608,000		$ 2,791,474,000
Tier 1 leverage capital ratio, Actual Ratio	0.0873		0.0865
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 1,302,964,000		$ 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	$ 1,628,705,000		$ 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
	Mar. 31, 2021	Mar. 31, 2020
Earnings for basic and diluted earnings per common share:
Net income	$ 108,078	$ 38,199
Less: Preferred stock dividends	1,969	1,969
Undistributed Earnings, Basic	106,109	36,230
Undistributed Earnings, Diluted, Total	106,109	36,230
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	579	209
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	579	209
Earnings applicable to common shareholders	105,530	36,021
Earnings applicable to common shareholders	$ 105,530	$ 36,021
Shares:
Weighted-average common shares outstanding - basic	89,809	90,936
Effect of dilutive securities	299	270
Weighted-average common shares outstanding - diluted	90,108	91,206
Earnings per common share (1):
Basic	$ 1.18	$ 0.40
Diluted	$ 1.17	$ 0.39

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
	Mar. 31, 2021	Mar. 31, 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	0	35

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	$ 5,647,069,000	$ 5,683,199,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	220,955,000	332,856,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	3,082,000	7,522,000
Asset Derivatives, Fair Value, Less: Cash collateral posted	39,973,000	33,043,000
Gross derivative instruments, before netting (1)	177,900,000	292,291,000
Liability Derivatives, Notional Amount	4,716,765,000	4,741,836,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	23,025,000	12,354,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	3,082,000	7,522,000
Liability Derivatives, Fair Value, Less: Cash collateral posted	2,701,000	4,485,000
Derivative liability	17,242,000	347,000
CME [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Less: Cash collateral posted	75,900,000
Gross derivative instruments, before netting (1)	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	43,092,000	40,565,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	43,055,000	40,565,000
Gross derivative instruments, before netting (1)	37,000	0
Derivative Liability, Fair Value, Gross Liability	5,783,000	12,007,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	5,783,000	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	32,581,000	39,641,000
Liability Derivatives, Notional Amount	25,000,000	25,000,000
Derivative Liability, Fair Value, Gross Liability	59,000	103,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	4,647,069,000	4,683,199,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement	188,374,000	293,215,000
Liability Derivatives, Notional Amount	4,691,765,000	4,716,836,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement	22,966,000	12,251,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swap, CME [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	300,000,000	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	4,502,668,000	4,533,441,000
Derivative Asset, Fair Value, Gross Asset	187,593,000	292,096,000
Liability Derivatives, Notional Amount	4,306,916,000	4,356,339,000
Derivative Liability, Fair Value, Gross Liability	22,762,000	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	82,700,000	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	368,400,000	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	43,494,000	40,771,000
Derivative Asset, Fair Value, Gross Asset	485,000	855,000
Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives [Member] | RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	3,303,000	0
Derivative Liability, Fair Value, Gross Liability	12,000	0
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	100,907,000	108,987,000
Derivative Asset, Fair Value, Gross Asset	296,000	264,000
Liability Derivatives, Notional Amount	381,546,000	360,497,000
Derivative Liability, Fair Value, Gross Liability	192,000	$ 377,000
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Other Commitment	$ 1,100,000

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
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ 6,844
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 4,734
Interest Rate Derivatives [Member] | Operating Expense [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	4,644	5,926
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	(382)	(993)
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	472	1,911
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(2,461)	1,861
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	121	1,121
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	$ (2,582)	$ 740

Derivative Financial Instrume_5

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Components Excluded from Assessment of Interest Rate Cash Flow Hedge Effectiveness	$ 9.4
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	(0.9)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ (10.3)

Derivative Financial Instrume_6

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative instrument asset, Amount Offset, Total	$ (3,082,000)	$ (7,522,000)
Derivative instrument asset, Amount Offset	39,973,000	33,043,000
Gross derivative instruments, before netting (1)	177,900,000	292,291,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	3,082,000	7,522,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(2,701,000)	(4,485,000)
Derivative liability	17,242,000	347,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(266,000)	(785,000)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	(303,000)	(785,000)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(727,000)	(1,247,000)
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	(727,000)	(1,247,000)
Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	43,092,000	40,565,000
Derivative instrument asset, Amount Offset, Total	(43,055,000)	(40,565,000)
Gross derivative instruments, before netting (1)	37,000	0
Derivative Liability, Fair Value, Gross Liability	5,783,000	12,007,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	5,783,000	12,007,000
Derivative liability	0	0
CME [Member]
Derivative [Line Items]
Derivative instrument asset, Amount Offset	75,900,000
Gross derivative instruments, before netting (1)	0
Interest Rate Derivatives [Member] | Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	32,581,000	39,641,000
Derivative Liability, Fair Value, Gross Liability	$ 59,000	$ 103,000

Derivative Financial Instrume_7

Derivative Financial Instruments Impact of Fair Value on Qualifying Hedges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ 6,844
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 342,826		$ 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	(2,461)	$ 1,861
Long-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 42,826		$ 44,164

Derivative Financial Instrume_8

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge	3 years 3 months 18 days
Derivative instrument asset, Amount Offset	$ 39,973	$ 33,043
Credit Derivative, Maximum Exposure, Undiscounted	182,300
Cash and Due from Banks [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	40,700
Valuation, Market Approach [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	39,600
CME [Member]
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 75,900

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	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 3,082	$ 7,522
Derivative Asset	177,900	292,291
Derivative Liability, Fair Value, Amount Offset Against Collateral	3,082	7,522
Derivative Liability	17,242	347
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	266	785
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	303	785
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	727	1,247
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	727	1,247
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	5,783	12,007
Derivative Asset, Fair Value, Gross Asset	43,092	40,565
Derivative Asset, Fair Value, Amount Offset Against Collateral	43,055	40,565
Derivative Asset	37	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	5,783	12,007
Derivative Liability	$ 0	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 19,300
Unused Commitments to Extend Credit	6,745,332		$ 6,755,563
Valuation Allowance for Impairment of Recognized Servicing Assets, Sales and Disposals	191	$ 575
Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	2,400
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	18,700
Alternative investments [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused Commitments to Extend Credit	$ 17,900

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring and Nonrecurring Basis) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	$ 3,313,980	$ 3,326,776
Gross derivative instruments, before netting (1)	177,900	292,291
Loans held for sale (valued under fair value option $17,260 and $14,000)	17,260	14,000
Financial liabilities held at fair value:
Derivative liability	17,242	347
Agency CMO [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	137,603	154,613
Agency MBS [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	1,456,456	1,457,409
Agency CMBS [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	974,585	1,117,233
Non-agency CMBS [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	663,013	508,018
CLO [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	68,643	76,383
Corporate debt securities [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	13,680	13,120
Fair Value, Recurring [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	3,313,980	3,326,776
Alternative investments (2)	15,896	11,112
Total financial assets held at fair value	3,572,936	3,689,555
Financial liabilities held at fair value:
Derivative liability	23,025	12,354
Fair Value, Recurring [Member] | Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	0	0
Alternative investments (2)	0	0
Total financial assets held at fair value	5,111	5,016
Financial liabilities held at fair value:
Derivative liability	98	218
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	3,313,980	3,326,776
Alternative investments (2)	0	0
Total financial assets held at fair value	3,551,929	3,673,427
Financial liabilities held at fair value:
Derivative liability	22,927	12,136
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	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)	220,955	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)	266	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)	220,689	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	4,845	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	4,845	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:
Loans held for sale (valued under fair value option $17,260 and $14,000)	17,260	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:
Loans held for sale (valued under fair value option $17,260 and $14,000)	0	0
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Loans held for sale (valued under fair value option $17,260 and $14,000)	17,260	14,000
Fair Value, Recurring [Member] | Loan Origination Commitments [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Loans held for sale (valued under fair value option $17,260 and $14,000)	0	0
Fair Value, Recurring [Member] | Agency CMO [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	137,603	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:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Agency CMO [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	137,603	154,613
Fair Value, Recurring [Member] | Agency CMO [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Agency MBS [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	1,456,456	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:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Agency MBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	1,456,456	1,457,409
Fair Value, Recurring [Member] | Agency MBS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Agency CMBS [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	974,585	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:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Agency CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	974,585	1,117,233
Fair Value, Recurring [Member] | Agency CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Non-agency CMBS [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	663,013	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:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	663,013	508,018
Fair Value, Recurring [Member] | Non-agency CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | CLO [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	68,643	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:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | CLO [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	68,643	76,383
Fair Value, Recurring [Member] | CLO [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Corporate debt securities [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	13,680	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:
Investment securities available-for-sale, at fair value	0	0
Fair Value, Recurring [Member] | Corporate debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	13,680	13,120
Fair Value, Recurring [Member] | Corporate debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets held at fair value:
Investment securities available-for-sale, at fair value	$ 0	$ 0

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Option, Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale (valued under fair value option $17,260 and $14,000)	$ 17,260	$ 14,000
Loans held for sale (valued under fair value option $17,260 and $14,000)	17,262	14,012
Fair Value, Option, Loans Held as Assets, Aggregate Difference	236	489
loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans held for sale (valued under fair value option $17,260 and $14,000)	$ 17,024	$ 13,511

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	$ 5,568,093	$ 5,568,188
Debt Securities, Held-to-maturity, Fair Value	5,730,726	5,835,364
Mortgage servicing assets, Carrying Amount	12,327	13,422	$ 16,391	$ 17,484
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities held-to-maturity (fair value of $5,730,726 and $5,835,364)	5,567,785	5,567,889
Loans and leases, net	20,973,032	21,281,784
Securities sold under agreements to repurchase and other borrowings	498,378	995,355
FHLB advances	138,554	133,164
Long-term debt	566,480	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	26,247,701	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	2,234,133	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	12,327	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	5,730,726	5,835,364
Securities sold under agreements to repurchase and other borrowings	505,387	1,000,189
FHLB advances	142,467	139,035
Long-term debt	522,850	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	21,085,680	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	26,247,701	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	2,237,004	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	$ 16,102	$ 14,362

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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
Expected return on plan assets	(3,595)	(3,380)
Recognized net loss	1,019	992
Net periodic benefit cost	(1,410)	(713)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	7	11
Expected return on plan assets	0	0
Recognized net loss	8	6
Net periodic benefit cost	15	17
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	4	13
Expected return on plan assets	0	0
Recognized net loss	(20)	(9)
Net periodic benefit cost	$ (16)	$ 4

Segment Reporting Segment Repor

Segment Reporting Segment Reporting Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)Segment	Jan. 01, 2021USD ($)	Dec. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	3
Goodwill	$ 538,373		$ 538,373
Retail Banking | Scenario, Adjustment
Segment Reporting Information [Line Items]
Goodwill		$ (131,000)
Commercial 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
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Goodwill	$ 538,373		$ 538,373
Assets	33,259,037		32,590,690
Net interest income	223,764	$ 230,801
Non-interest income	76,757	73,378
Non-interest expense	187,982	178,836
Pre-tax, pre-provision net revenue	112,539	125,343
Provision for credit losses	(25,750)	76,000
Income before income tax expense	138,289	49,343
Income tax expense	30,211	11,144
Net income	108,078	38,199
Operating Segments [Member] | Commercial Banking
Segment Reporting Information [Line Items]
Goodwill	131,000		131,000
Assets	14,602,793		14,732,792
Net interest income	142,038	117,587
Non-interest income	25,177	22,416
Non-interest expense	64,836	65,221
Pre-tax, pre-provision net revenue	102,379	74,782
Provision for credit losses	(19,373)	69,018
Income before income tax expense	121,752	5,764
Income tax expense	30,803	1,406
Net income	90,949	4,358
Operating Segments [Member] | HSA Bank
Segment Reporting Information [Line Items]
Goodwill	21,813		21,813
Assets	83,707		80,352
Net interest income	42,109	42,673
Non-interest income	27,005	26,383
Non-interest expense	36,250	37,078
Pre-tax, pre-provision net revenue	32,864	31,978
Provision for credit losses	0	0
Income before income tax expense	32,864	31,978
Income tax expense	8,775	8,538
Net income	24,089	23,440
Operating Segments [Member] | Retail Banking
Segment Reporting Information [Line Items]
Goodwill	385,560		385,560
Assets	7,514,326		7,726,287
Net interest income	88,813	81,199
Non-interest income	16,071	18,443
Non-interest expense	76,124	80,290
Pre-tax, pre-provision net revenue	28,760	19,352
Provision for credit losses	(6,386)	7,067
Income before income tax expense	35,146	12,285
Income tax expense	7,732	2,678
Net income	27,414	9,607
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	0		0
Assets	11,058,211		$ 10,051,259
Net interest income	(49,196)	(10,658)
Non-interest income	8,504	6,136
Non-interest expense	10,772	(3,753)
Pre-tax, pre-provision net revenue	(51,464)	(769)
Provision for credit losses	9	(85)
Income before income tax expense	(51,473)	(684)
Income tax expense	(17,099)	(1,478)
Net income	$ (34,374)	$ 794

Revenue from Contracts with C_3

Revenue from Contracts with Customers Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 52,407	$ 53,167
Non-interest income	76,757	73,378
Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40,469	42,570
Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9,403	8,739
Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,535	1,858
Non-interest income within the scope of other GAAP topics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	24,350
Non-interest income		20,211
Operating Segments [Member] | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13,815	12,913
Non-interest income	25,177	22,416
Operating Segments [Member] | Commercial Banking | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,101	3,911
Operating Segments [Member] | Commercial Banking | Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9,412	8,746
Operating Segments [Member] | Commercial Banking | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	302	256
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	11,362
Non-interest income		9,503
Operating Segments [Member] | HSA Bank
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	27,005	26,383
Non-interest income	27,005	26,383
Operating Segments [Member] | HSA Bank | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	25,018	24,842
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
Operating Segments [Member] | HSA Bank | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,987	1,541
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
Operating Segments [Member] | Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11,549	13,801
Non-interest income	16,071	18,443
Operating Segments [Member] | Retail Banking | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	11,303	13,740
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
Operating Segments [Member] | Retail Banking | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	246	61
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	4,522
Non-interest income		4,642
Corporate, Non-Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	38	70
Non-interest income	8,504	6,136
Corporate, Non-Segment [Member] | Deposit service fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	47	77
Corporate, Non-Segment [Member] | Wealth and investment services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(9)	(7)
Corporate, Non-Segment [Member] | Other non interest income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	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	$ 8,466
Non-interest income		$ 6,066

Commitments and Contingencies_2

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 6,745,332	$ 6,755,563
Standby letter of credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	213,282	207,201
Commercial letter of credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	48,111	30,522
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 6,483,939	$ 6,517,840

(Reserve for Unfunded Commitmen

(Reserve for Unfunded Commitments) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Standards Update 2016-13 [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 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	12,755	2,367
Provision (benefit)	45	(1,422)
Ending balance	$ 12,800	$ 10,084

Business Developments - Narrati

Business Developments - Narrative (Details) - Sterling - Subsequent Event $ in Billions	Apr. 19, 2021USD ($)
Business Acquisition [Line Items]
Total consideration	$ 5.1
Share exchange ratio	0.463

Business Developments - Changes

Business Developments - Changes in Reserves Associated with Strategic Initiatives (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 19,795
Charged to earnings	9,441
Charged against assets	(1,813)
Cash payments	(4,508)
Ending balance	22,915
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning balance	17,675
Charged to earnings	2,060
Charged against assets	0
Cash payments	(1,365)
Ending balance	18,370
Other Restructuring
Restructuring Reserve [Roll Forward]
Beginning balance	2,120
Charged to earnings	7,202
Charged against assets	(1,634)
Cash payments	(3,143)
Ending balance	4,545
Right-of-Use Asset Charges
Restructuring Reserve [Roll Forward]
Beginning balance	0
Charged to earnings	179
Charged against assets	(179)
Cash payments	0
Ending balance	$ 0