Webster Financial (WBS) 10-K 10 Mar 23 2022 FY Annual report Financial data

Cover

Cover - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Feb. 28, 2023	Jun. 30, 2022
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2022
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	200 Elm Street
Entity Address, City or Town	Stamford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902
City Area Code	203
Local Phone Number	578-2202
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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 Public Float			$ 7,300,000
Entity Common Stock, Shares Outstanding		174,008,598
Amendment Flag	false
Entity Central Index Key	0000801337
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Documents Incorporated by Reference	Part III: Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on April 27, 2023 (the “Proxy Statement”).
ICFR Auditor Attestation Flag	true
Common Class A [Member] | NEW YORK STOCK EXCHANGE, INC. [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
Preferred Stock Series F Issued | NEW YORK STOCK EXCHANGE, INC. [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
Preferred Stock Series G Issued | NEW YORK STOCK EXCHANGE, INC. [Member]
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing 1/40th interest in a share
Trading Symbol	WBS-PrG
Security Exchange Name	NYSE

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Firm ID	185
Auditor Location	Hartford, Connecticut

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Cash and due from banks	$ 264,118	$ 137,385
Interest-bearing deposits	575,825	324,185
Fair Value	7,892,697	4,234,854
Investment securities held-to-maturity, net of allowance for credit losses of $182 and $214	6,564,697	6,198,125
Federal Home Loan Bank and Federal Reserve Bank stock	445,900	71,836
Loans held for sale (valued under fair value option)	1,991	4,694
Loans and leases	49,764,426	22,271,729
Allowance for credit losses on loan and leases	(594,741)	(301,187)
Loans and leases, net	49,169,685	21,970,542
Deferred tax assets, net	371,634	109,405
Property and equipment, net	430,184	204,557
Goodwill	2,514,104	538,373
Other intangible assets, net	199,342	17,869
Cash surrender value of life insurance policies	1,229,169	572,305
Accrued interest receivable and other assets	1,618,175	531,469
Total assets	71,277,521	34,915,599
Liabilities and stockholders' equity:
Non-interest-bearing	12,974,975	7,060,488
Interest-bearing	41,079,365	22,786,541
Total deposits	54,054,340	29,847,029
Securities sold under agreements to repurchase and other borrowings	1,151,830	674,896
Federal Home Loan Bank advances	5,460,552	10,997
Long-term debt	1,073,128	562,931
Accrued expenses and other liabilities	1,481,485	381,421
Total liabilities	63,221,335	31,477,274
Stockholders’ equity:
Common stock	1,828	937
Paid-in capital	6,173,240	1,108,594
Retained earnings	2,713,861	2,333,288
Treasury stock, at cost—8,770,472 and 3,102,690 shares	(431,762)	(126,951)
Accumulated other comprehensive (loss), net of tax	(684,960)	(22,580)
Total stockholders' equity	8,056,186	3,438,325
Total liabilities and stockholders' equity	71,277,521	34,915,599
Preferred Stock Series F Issued
Stockholders’ equity:
Preferred stock	145,037	145,037
Preferred Stock Series G Issued
Stockholders’ equity:
Preferred stock	$ 138,942	$ 0

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 182	$ 214
Value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Common stock par value (in usd per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	400,000,000	200,000,000
Common stock, shares issued	182,778,045	93,686,311
Treasury Stock, Common, Shares	8,770,472	3,102,690
Preferred Stock Series F Issued
Preferred Stock, Shares Outstanding	6,000	6,000
Preferred Stock, Shares Issued	6,000	6,000
Preferred Stock Series G Issued
Preferred Stock, Shares Outstanding	135,000
Preferred Stock, Shares Issued	135,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest Income:
Interest and fees on loans and leases	$ 1,946,558	$ 762,713	$ 789,719
Taxable interest and dividends on securities	287,659	159,001	189,683
Non-taxable interest on securities	50,442	20,884	21,878
Loans held for sale	78	246	769
Interest income	2,284,737	942,844	1,002,049
Interest Expense:
Deposits	138,552	20,131	67,897
Securities sold under agreements to repurchase and other borrowings	19,059	3,040	5,941
Federal Home Loan Bank advances	58,557	1,708	18,767
Long-term debt	34,283	16,876	18,051
Interest expense	250,451	41,755	110,656
Net interest income	2,034,286	901,089	891,393
Provision (benefit) for credit losses	280,619	(54,500)	137,750
Net interest income (loss) after provision for loan and lease losses	1,753,667	955,589	753,643
Non-interest Income:
Deposit service fees	198,472	162,710	156,032
Loan and lease related fees	102,987	36,658	29,127
Wealth and investment services	40,277	39,586	32,916
Mortgage banking activities	705	6,219	18,295
Increase in cash surrender value of life insurance policies	29,237	14,429	14,561
Net loss (gain) on sale of investment securities	(6,751)	0	8
Other income	75,856	63,770	34,338
Total non-interest income	440,783	323,372	285,277
Non-interest Expense:
Compensation and benefits	723,620	419,989	428,391
Occupancy	113,899	55,346	71,029
Technology and equipment	186,384	112,831	112,273
Intangible assets amortization	31,940	4,513	4,160
Marketing	16,438	12,051	14,125
Professional and outside services	117,530	47,235	32,424
Deposit insurance	26,574	15,794	18,316
Other expense	180,088	77,341	78,228
Total non-interest expense	1,396,473	745,100	758,946
Income before income tax expense	797,977	533,861	279,974
Income tax expense	153,694	124,997	59,353
Net income	644,283	408,864	220,621
Preferred stock dividends	(15,919)	(7,875)	(7,875)
Net income available to common shareholders, basic	628,364	400,989	212,746
Net income available to common shareholders, diluted	$ 628,364	$ 400,989	$ 212,746
Earnings per common share:
Earnings per common share, Basic (in dollars per share)	$ 3.72	$ 4.43	$ 2.35
Earnings per common share, Diluted (in dollars per share)	$ 3.72	$ 4.42	$ 2.35

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other comprehensive (loss) income, net of tax:
Net income	$ 644,283	$ 408,864	$ 220,621
Investment securities available-for-sale	(635,696)	(62,888)	50,173
Derivative instruments	(14,944)	(13,848)	29,102
Total defined benefit pension and postretirement benefit plans	(11,740)	11,900	(947)
Other comprehensive (loss) income, net of tax	(662,380)	(64,836)	78,328
Comprehensive income	$ (18,097)	$ 344,028	$ 298,949

Consolidated Statement of Share

Consolidated Statement of Shareholder Equity Statement - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Series E Preferred Stock [Member]	Preferred Stock Series F Issued	Preferred Stock Series G Issued	Common Stock	Preferred Stock	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member] Series E Preferred Stock [Member]	Retained Earnings [Member] Preferred Stock Series F Issued	Retained Earnings [Member] Preferred Stock Series G Issued	Treasury Stock Held	AOCI Attributable to Parent [Member]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Beginning Balance at Dec. 31, 2019	$ 3,207,770						$ 145,037	$ 937	$ 1,113,250	$ 2,061,352					$ (76,734)	$ (36,072)
Beginning Balance (Adoption of ASU No. 2016-13) at Dec. 31, 2019		$ (51,213)									$ (51,213)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	220,621									220,621
Other Comprehensive Income (Loss), Net of Tax	78,328															78,328
Dividends, Common Stock	(145,363)									(145,363)
Dividends, Preferred Stock			$ (7,875)									$ (7,875)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	12,179								(3,524)	0					15,703
Stock Issued During Period, Value, Stock Options Exercised	240								(194)						434
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(3,506)														(3,506)
Stock Repurchased During Period, Value	(76,556)														(76,556)
Ending 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]
Common Stock, Dividends, Per Share, Declared						$ 1.60
Preferred Stock, Dividends Per Share, Declared			$ 1,312.5
Net income	408,864									408,864
Other Comprehensive Income (Loss), Net of Tax	(64,836)															(64,836)
Dividends, Common Stock	(145,223)									(145,223)
Dividends, Preferred Stock				$ (7,875)									$ (7,875)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	13,662								4,235						9,427
Stock Issued During Period, Value, Stock Options Exercised	3,492								(5,173)						8,665
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(4,384)														(4,384)
Ending Balance at Dec. 31, 2021	3,438,325						145,037	937	1,108,594	2,333,288					(126,951)	(22,580)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared						1.60
Preferred Stock, Dividends Per Share, Declared				$ 1,312.5
Net income	644,283									644,283
Other Comprehensive Income (Loss), Net of Tax	(662,380)															(662,380)
Dividends, Common Stock	(247,791)									(247,791)
Dividends, Preferred Stock				$ (7,875)	$ (8,044)								$ (7,875)	$ (8,044)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	54,099								26,748						27,351
Stock Issued During Period, Value, Stock Options Exercised	703								(692)						1,395
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(23,655)														(23,655)
Stock Issued During Period, Value, Acquisitions	5,180,124						138,942	891	5,040,291
Stock Issued During Period, Value, Charitable Contributions	10,500								(1,701)						12,201
Stock Repurchased During Period, Value	(322,103)														(322,103)
Ending Balance at Dec. 31, 2022	$ 8,056,186						$ 283,979	$ 1,828	$ 6,173,240	$ 2,713,861					$ (431,762)	$ (684,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared						$ 1.60
Preferred Stock, Dividends Per Share, Declared				$ 1,312.5	$ 65

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Net income	$ 644,283	$ 408,864	$ 220,621
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for credit losses	280,619	(54,500)	137,750
Deferred tax expense (benefit)	(69,664)	(4,998)	(31,236)
Stock-based compensation	54,099	13,662	12,179
Common stock contribution to charitable foundation	10,500	0	0
Depreciation and amortization	81,800	35,913	36,616
Amortization of earning assets and funding premium/discount, net	(26,215)	133,069	75,929
Amortization of low-income housing tax credit investments	44,208	3,918	5,286
Amortization of mortgage servicing assets	870	5,593	6,562
Increase (Decrease) in Leasing Receivables	(56,783)	(22,781)	(27,868)
Gain on sale, net of write-down, on foreclosed and repossessed assets	(1,130)	(744)	(1,938)
Loss (gain) on sale, net of write-down, on premises and equipment	8,293	(1,236)	1,105
Net loss (gain) on sale of investment securities	6,751	0	(8)
Originations of loans held for sale	(33,107)	(235,066)	(449,803)
Proceeds from sale of loans held for sale	36,335	247,634	486,341
Net (gain) on mortgage banking activities	(580)	(5,912)	(15,305)
Net (gain) on sale of loans not originated for sale	(3,322)	(3,862)	(301)
Increase in cash surrender value of life insurance policies	(29,237)	(14,429)	(14,561)
Gain from life insurance policies	(6,311)	(4,402)	(1,219)
Net decrease (increase) in derivative contract assets net of liabilities	536,820	173,506	(118,336)
Net (increase) decrease in accrued interest receivable and other assets	(106,740)	(69,263)	11,120
Net (decrease) increase in accrued expenses and other liabilities	(149,103)	38,064	(8,121)
Net cash provided by operating activities	1,335,952	688,592	380,549
Investing Activities:
Purchases of available-for-sale securities	(1,099,810)	(1,957,562)	(990,904)
Proceeds from maturities and principal payments of available-for-sale securities	754,545	935,621	627,577
Proceeds from sales of available-for-sale securities	172,947	0	8,963
Purchases of held-to-maturity securities	(1,150,023)	(1,968,133)	(1,297,535)
Proceeds from maturities and principal payments of held-to-maturity securities	750,752	1,288,140	983,864
Net proceeds from (purchase of) Federal Home Loan Bank stock	(223,562)	5,758	71,452
Purchases of intercompany debt securities	(24,887)	(11,361)	(12,244)
Net (increase) in loans	(7,501,545)	(773,443)	(1,681,947)
Proceeds from loans not originated for sale	679,693	82,187	9,197
Proceeds from the sale of foreclosed properties and repossessed assets	2,568	1,998	11,497
Proceeds from the sale of premises and equipment	300	3,221	866
Additions to premises and equipment	(28,762)	(16,589)	(21,280)
Proceeds from life insurance policies	21,893	5,074	1,885
Payments to Acquire Businesses, Net of Cash Acquired	54,407	0	0
Net (increase) decrease in interest-bearing deposits	513,960	0	0
Net cash provided by (used in) investing activities	(7,186,338)	(2,405,089)	(2,288,609)
Financing Activities:
Net increase in deposits	936,001	2,511,163	4,006,319
Proceeds from Federal Home Loan Bank advances	27,450,000	180,470	3,850,000
Repayments of Federal Home Loan Bank advances	(22,000,445)	(302,637)	(5,665,312)
Proceeds From Extinguishment Of Debt	2,548	0	0
Net increase (decrease) in securities sold under agreements to repurchase and other borrowings	447,202	(320,459)	(45,076)
Dividends paid to common shareholders	(247,767)	(144,807)	(144,965)
Dividends paid to preferred shareholders	(13,725)	(7,875)	(7,875)
Exercise of stock options	703	3,492	240
Common stock repurchased	(322,103)	0	(76,556)
Common shares acquired related to stock compensation plan activity	(23,655)	(4,384)	(3,506)
Net cash (used in) by financing activities	6,228,759	1,914,963	1,913,269
Net (decrease) increase in cash and cash equivalents	378,373	198,466	5,209
Cash and cash equivalents at beginning of year	461,570	263,104	257,895
Cash and cash equivalents at end of year	839,943	461,570	263,104
Supplemental disclosure of cash flow information:
Interest paid	240,851	42,151	118,123
Income taxes paid	193,544	112,587	94,072
Noncash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets	774	1,757	5,394
Transfer of loans from portfolio to loans held for sale	652,855	78,316	8,578
Deposits assumed	313	0	4,657
Sterling
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for credit losses	175,100
Noncash investing and financing activities:
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	26,922,010	0	0
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	2,149,865	0	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	24,405,711	0	0
Stock Issued	5,041,182	0	0
Sterling | Preferred Stock
Noncash investing and financing activities:
Total consideration	138,942	0	0
Bend Financial, Inc.
Noncash investing and financing activities:
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	15,731	0	0
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	38,966	0	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	$ 290	$ 0	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
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 Stamford, Connecticut. Webster Bank, along with its HSA Bank Division, is a leading commercial bank in the Northeast that delivers a wide range of digital and traditional financial solutions to businesses, individuals, families, and partners across its three differentiated lines of business: Commercial Banking, HSA Bank, and Consumer Banking. While its core footprint spans from New York to Rhode Island and Massachusetts, certain businesses operate in extended geographies. HSA Bank is one of the largest providers of employee benefits solutions in the United States. Basis of Presentation The Consolidated Financial Statements have been prepared in accordance with GAAP, and include the accounts of the Company and all other entities in which the Company has a controlling financial interest. Intercompany transactions and balances have been eliminated in consolidation. Assets under administration or assets under management that the Company holds or manages in a fiduciary or agency capacity for customers are not included on the accompanying Consolidated Balance Sheets. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications did not have a significant impact on the Company's Consolidated Financial Statements. Principles of Consolidation The purpose of Consolidated Financial Statements is to present the results of operations and the financial position of the Company and its subsidiaries as if the consolidated group were a single economic entity. In accordance with the applicable accounting guidance for consolidations, the Consolidated Financial Statements include any VOE in which the Company has a controlling financial interest and any VIE for which the Company is deemed to be the primary beneficiary. The Company generally consolidates its VOEs if the Company, directly or indirectly, owns more than 50% of the outstanding voting shares of the entity, and if the non-controlling stockholders do not hold any substantive participating or controlling rights. The Company evaluates VIEs to understand the purpose and design of the entity, and its involvement in the ongoing activities of the VIE, and will consolidate the VIE if it has (i) the power to direct the activities of the VIE that most significantly affect the VIE's economic performance, and (ii) an obligation to absorb losses of the VIE, or the right to receive benefits from the VIE, that could potentially be significant to the VIE. The Company accounts for unconsolidated partnerships and certain other investments using the equity method of accounting if it has the ability to significantly influence the operating and financial policies of the investee. This is generally presumed to exist when the Company owns between 20% and 50% of a corporation, or when it has greater than 3% to 5% interest in a limited partnership or similarly structured entity. Additional information regarding consolidated and non-consolidated VIEs can be found within Note 15: Variable Interest Entities. Use of Estimates The preparation of the Consolidated Financial Statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Business Combinations Business combinations are accounted for under the acquisition method, in which the identifiable assets acquired and liabilities assumed are generally measured and recognized at fair value as of the acquisition date, with the excess of the purchase price over the fair value of the net assets acquired recognized as goodwill. Items such as acquired ROU lease assets and operating lease liabilities as lessee, employee benefit plans, and income-tax related balances are recognized in accordance with other applicable GAAP, which may result in measurements that differ from fair value. Business combinations are included in the Consolidated Financial Statements from the respective dates of acquisition. Historical reporting periods reflect only the results of legacy Webster operations. Merger-related costs are expensed in the period incurred and presented within the applicable Cash and Cash Equivalents Cash and cash equivalents is comprised of cash and due from banks and interest-bearing deposits. Cash equivalents have a maturity of three months or less. Cash and due from banks includes cash on hand, certain deposits at the FRB, and cash due from banks. Restricted cash related to Federal Reserve System requirements and cash collateral received on derivative positions are included in Cash and due from banks. Interest-bearing deposits includes deposits at the FRB in excess of reserve requirements, if any, and federal funds sold to other financial institutions. Investments in Debt Securities Debt security transactions are recognized on the trade date, which is the date the order to buy or sell the security is executed. Investments in debt securities are classified as AFS or HTM at the time of purchase. Any classification change subsequent to the trade date is reviewed for compliance with corporate objectives and accounting policies. Debt securities classified as AFS are recorded at fair value with unrealized gains and losses recorded as a component of (AOCL). If a debt security is transferred from AFS to HTM, it is recorded at fair value at the time of transfer and any respective gain or loss would be recorded as a separate component of (AOCL) and amortized as an adjustment to interest income over the remaining life of the security. Debt securities classified as AFS are reviewed for credit losses when the fair value of a security falls below the amortized cost basis and the decline is evaluated to determine if any portion is attributable to credit loss. The decline in fair value attributable to credit loss is recorded directly to earnings, with a corresponding allowance for credit loss, limited to the amount that fair value is less than the amortized cost. If the credit quality subsequently improves, previously recorded allowance amounts may be reversed. An AFS debt security will be placed on non-accrual status if collection of principal and interest in accordance with contractual terms is doubtful. When the Company intends to sell an impaired AFS debt security, or if it is more likely than not that the Company will be required to sell the security prior to recovery of the amortized cost basis, the entire fair value adjustment will immediately be recognized in earnings through non-interest income. The gain or loss on sale is calculated using the carrying value plus any related accumulated (AOCL) balance associated with the securities sold. Debt securities classified as HTM are those in which the Company has the ability and intent to hold to maturity. Debt securities classified as HTM are recorded at amortized cost net of unamortized premiums and discounts. Discount accretion income and premium amortization expense are recognized as interest income using the effective interest method, with consideration given to prepayment assumptions on mortgage backed securities. Premiums are amortized to the earliest call date for debt securities purchased at a premium, with explicit, non-contingent call features and are callable at a fixed price and preset date. Debt securities classified as HTM are reviewed for credit losses under the CECL model with an allowance recorded on the balance sheet for expected lifetime credit losses. The ACL is calculated on a pooled basis using statistical models which include forecasted scenarios of future economic conditions. Forecasts revert to long-run loss rates implicitly through the economic scenario, generally over three years. If the risk for a particular security no longer matches the collective assessment pool, it is removed and individually assessed for credit deterioration. The non-accrual policy for HTM debt securities is the same as for AFS debt securities. A zero credit loss assumption is maintained for U.S. Treasuries and agency-backed securities in both the AFS and HTM portfolios, as applicable. This assumption is subject to quarterly review to ensure it remains appropriate. Additional information regarding investments in debt securities can be found within Note 3: Investment Securities. Investments in Equity Securities The Company’s accounting treatment for non-consolidated equity investments differs for those with and without readily determinable fair values. Equity investments with readily determinable fair values are recorded at fair value with changes in fair value recorded in non-interest income. For equity investments without readily determinable fair values, the Company elected the measurement alternative, and therefore carries these investments at cost, less impairment, if any, plus or minus changes in observable prices. Certain equity investments that do not have a readily available fair value may qualify for NAV measurement based on specific requirements. The Company's alternative investments accounted for at NAV consist of investments in non-public entities that generally cannot be redeemed since the Company’s investments are distributed as the underlying equity is liquidated. On a quarterly basis, the Company reviews its equity investments without readily determinable fair values for impairment. If the equity investment is considered impaired, an impairment loss equal to the amount by which the carrying value exceeds its fair value is recorded through a charge to earnings. The impairment loss may be reversed in a subsequent period if there are observable transactions for the identical or similar investment of the same issuer at a higher amount than the carrying amount that was established when the impairment was recognized. Impairments, as well as upward or downward adjustments resulting from observable price changes in orderly transactions for identical or similar investments, are included in non-interest income. Equity investments in entities that finance affordable housing and other community development projects provide a return primarily through the realization of tax benefits. The Company applies the proportional amortization method to account for its investments in qualified affordable housing projects. Investment in Federal Home Loan Bank and Federal Reserve Bank Stock The Bank is a member of the FHLB and the Federal Reserve System, and is required to maintain an investment in capital stock of both the FHLB and FRB. Based on redemption provisions, FHLB and FRB stock has no quoted market value and is carried at cost. Membership stock is reviewed for impairment if economic circumstances would warrant review. Loans Held for Sale Loans that are classified as held for sale at the time of origination are accounted for under the fair value option. Loans not originated for sale but subsequently transferred to held for sale are valued at the lower of cost or fair value on an individual asset basis. Any cost amount in excess of fair value is recorded as a valuation allowance and recognized as a reduction of other non-interest income. Gains or losses on the sale of loans held for sale are recorded either as part of Mortgage banking activities or Other income on the accompanying Consolidated Statements of Income. Cash flows from the sale of loans that were originated for sale are presented within Operating activities on the accompanying Consolidated Statements of Cash Flows, whereas cash flows from the sale of loans that were originated for investment and then subsequently transferred to held for sale are presented within Investing activities. Additional information regarding mortgage banking activities and loans sold can be found within Note 5: Transfers and Servicing of Financial Assets. Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is generally considered to have been surrendered when: (i) the transferred assets are legally isolated from the Company or its consolidated affiliates, even in bankruptcy or other receivership, (ii) the transferee has the right to pledge or exchange the assets with no conditions that constrain the transferee and provide more than a trivial benefit to the Company, and (iii) the Company does not maintain the obligation or unilateral ability to reclaim or repurchase the assets. The Company sells financial assets in the normal course of business, the majority of which are residential mortgage loan sales to government-sponsored enterprises through established programs, as well as commercial loan sales through participation agreements, and other individual or portfolio loan and securities sales. In accordance with the accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. With the exception of servicing, the Company’s continuing involvement with financial assets sold is minimal, and generally is limited to market customary representation and warranty clauses covering certain characteristics of the mortgage loans that were sold, and the Company's origination process. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets, the consideration received, and any other assets obtained or liabilities incurred in exchange for the transferred assets. When the Company sells financial assets, it may retain servicing rights and/or other interests in the financial assets. Servicing assets and any other interests held by the Company are recorded at fair value upon transfer, and subsequently carried at the lower of cost or fair value. Additional information regarding transfers of financial assets and mortgage servicing assets can be found within Note 5: Transfers and Servicing of Financial Assets. Loans and Leases Loans and leases are stated at the principal amount outstanding, net of amounts charged-off, unamortized premiums and discounts, and deferred loan and lease fees or costs, which are recognized as yield adjustments using the effective interest method. These yield adjustments are amortized over the contractual life of the related loans and leases and are adjusted for prepayments, as applicable. Interest on loans and leases is credited to interest income as earned based on the interest rate applied to principal amounts outstanding. Amounts of cash receipts and cash payments for loans and leases are presented net within Investing activities on the Consolidated Statements of Cash Flows. Non-accrual Loans Loans are placed on non-accrual status when full collection of principal and interest in accordance with contractual terms is not expected based on available information, which generally occurs when principal or interest payments become 90 days delinquent unless the loan is well secured and in the process of collection, or sooner if circumstances indicate that the borrower may be unable to meet contractual principal or interest payments. The Company considers a loan to be “well-secured” when it is secured by collateral in the form of liens on or pledges of real or personal property that have a realizable value sufficient to discharge the debt in full, or when it is secured by a contractual guarantee of a financially responsible party. The Company considers a loan “in the process of collection” if collection of the debt is proceeding in due course either through legal action or through collection efforts not involving legal action that are reasonably expected to result in repayment of the debt or in its restoration to a current status in the near future. When loans and leases are placed on non-accrual status, the accrual of interest income and the amortization or accretion of premiums, discounts, and deferred fees and costs is discontinued, and any previously accrued interest is reversed as a reduction of interest income. For commercial loans and leases, if the Company determines that repayment of non-accrual loans and leases is not expected, any payment received is applied to principal until the unpaid balance has been fully recovered. Any excess is then credited to interest income. For consumer loans, if the Company determines that principal can be repaid, interest payments are taken into income as received on a cash basis. Loans are generally removed from non-accrual status when they become current as to principal and interest or demonstrate a period of performance under the contractual terms and, in the opinion of management, are fully collectible as to principal and interest. For commercial loans, a sustained period of repayment performance is generally required. All TDRs qualify for return to accrual status once the borrower has demonstrated performance with the restructured terms of the loan agreement for a minimum of six consecutive months. Pursuant to regulatory guidance, a loan discharged under Chapter 7 of the U.S. bankruptcy code is removed from non-accrual status when full repayment of the remaining pre-discharged contractual principal and interest is expected, and there have been at least six consecutive months of current payments. Additional information regarding Allowance for Credit Losses on Loans and Leases The ACL on loans and leases, which is established through a provision charged to expense, is a contra-asset account that offsets the amortized cost basis of loans and leases for the credit losses that are expected to occur over the life of the asset. Executive management reviews and advises on the adequacy of the allowance, which is maintained at a level that management deems to be sufficient to cover expected credit losses within the loan and lease portfolios. The Company has elected to present accrued interest receivable separately from the amortized cost basis of Loans and leases on the accompanying Consolidated Balance Sheets. An ACL on accrued interest for a loan is not measured as accrued interest income is reversed against interest income for non-accrual loans immediately after their non-accrual classification. The ACL on loans and leases is determined using the CECL model, whereby an expected lifetime credit loss is recognized at the origination or purchase of an asset, including those acquired through a business combination, which is then reassessed at each reporting date over the contractual life of the asset. The calculation of expected credit losses includes consideration of past events, current conditions, and reasonable and supportable economic forecasts that affect the collectability of the reported amounts. Generally, expected credit losses are determined through a pooled, collective assessment of loans and leases with similar risk characteristics. However, if the risk characteristics of a loan or lease change such that it no longer matches that of the collectively assessed pool, it is removed from the population and individually assessed for credit losses. The total ACL on loans and leases recorded by management represents the aggregated estimated credit loss determined through both the collective and individual assessments. Collectively Assessed Loans and Leases. Collectively assessed loans and leases are segmented based on product type, credit quality, risk ratings, and/or collateral types within its commercial and consumer portfolios, and expected losses are determined using a PD, LGD, EAD, loss rate, or discounted cash flow framework. Expected credit losses are calculated as the product of the probability of a loan defaulting, expected loss given the occurrence of a default, and the expected exposure of a loan at default. Summing the product across loans over their lives yields the lifetime expected credit losses for a given portfolio. The Company’s PD and LGD calculations are predictive models that measure the current risk profile of the loan pools using forecasts of future macroeconomic conditions, historical loss information, and credit risk ratings. 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. A (7) "Special Mention" rating has a potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the asset. A (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 asset with the added characteristic that the weakness makes collection or liquidation in full given current facts, conditions, and values improbable. Assets classified as a (10) "Loss" rating are considered uncollectible and charged-off. Risk ratings, which are assigned to differentiate risk within the portfolio, are reviewed on an ongoing basis and revised to reflect changes in a borrower's current financial position and outlook, risk profile, and the related collateral and structural position. Loan officers review updated financial information or other loan factors on at least an annual basis for all pass rated loans to assess the accuracy of the risk grade. Criticized loans undergo more frequent reviews and enhanced monitoring. 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 and a higher FICO score is indicative of lower credit risk. FICO scores are updated at least on a quarterly basis. The factors such as past due status, employment status, collateral, geography, loans discharged in bankruptcy, and the status of first lien position loans on second lien position loans, are also considered to be consumer portfolio credit quality indicators. For portfolio monitoring purposes, the Company estimates the current value of property secured as collateral for home equity and residential first mortgage lending products on an ongoing basis. The estimate is based on home price indices compiled by the S&P/Case-Shiller Home Price Indices. Real estate price data is applied to the loan portfolios taking into account the age of the most recent valuation and geographic area. The Company’s models incorporate a single economic forecast scenario and macroeconomic assumptions over a reasonable and supportable forecast period. The development of the reasonable and supportable forecast period assumes that each macroeconomic variable will revert to long-term expectations, with reversion characteristics unique to specific economic indicators and forecasts. Reversion towards long-term expectations generally begins two to three years from the forecast start date and is complete within three to five years. Certain models use output reversion and revert to mean historical loss rates on a straight-line basis in the third year of the forecast. Other models use input reversion and revert to the mean of macroeconomic variables in reasonable and supportable forecasts. Historical loss rates are based on approximately 10 years of recently available data and are updated annually. The calculation of EAD follows an iterative process to determine the expected remaining principal balance of a loan based on historical paydown rates for loans of a similar segment within the same portfolio. The calculation of portfolio exposure in future quarters incorporates expected losses and principal paydowns (the combination of contractual repayments and voluntary prepayments). A portion of the collective ACL is comprised of qualitative adjustments for risk characteristics that are not reflected or captured in the quantitative models, but are likely to impact the measurement of estimated credit losses. Macroeconomic variables are used as inputs to the loss models and are selected based on the correlation of the variables to credit losses for each class of financing receivable as follows: the commercial models use unemployment, gross domestic product, commercial real estate price indices, and retail sales (for commercial unfunded); the residential model uses the Case-Shiller Home Price Index; the home equity loan and line of credit models use interest rate spreads between U.S. Treasuries and corporate bonds and, in addition, the home equity loan model also uses the Federal Housing Finance Agency Home Price Index; and the personal loan and credit line models use the Case-Shiller Home Price Index and Federal Housing Finance Agency Home Price Index. Forecasted economic scenarios are sourced from a third party. Data from the baseline forecast scenario is used as the input to the modeled loss calculation. Changes in forecasts of macroeconomic variables will impact expectations of lifetime credit losses calculated by the loss models. However, the impact of changes in macroeconomic forecasts may be different for each portfolio and will reflect the credit quality and nature of the underlying assets at that time. To further refine the expected loss estimate, qualitative factors are used reflecting consideration of credit concentration, credit quality trends, the quality of internal loan reviews, the nature and volume of portfolio growth, staffing levels, underwriting exceptions, and other economic considerations that are not reflected in the base loss model. Management may apply additional qualitative adjustments to reflect other relevant facts and circumstances that impact expected credit losses. These economic and qualitative inputs are used to forecast expected losses over the reasonable and supportable forecast period. In addition to the above considerations, the ACL calculation includes expectations of prepayments and recoveries. Extensions, renewals, and modifications are not included in the collective assessment. However, if there is a reasonable expectation of a TDR, the loan is removed from the collective assessment pool and is individually assessed. Individually Assessed Loans and Leases. When loans and leases no longer match the risk characteristics of the collectively assessed pool, they are removed from the collectively assessed population and individually assessed for credit losses. Generally, all non-accrual loans, TDRs, potential TDRs, loans with a charge-off, and collateral dependent loans where the borrower is experiencing financial difficulty, are individually assessed. Individual assessment for collateral dependent commercial loans facing financial difficulty is based on the fair value of the collateral less estimated cost to sell, the present value of the expected cash flows from the operation of the collateral, or a scenario weighted approach of both of these methods. If a loan is not collateral dependent, the individual assessment is based on a discounted cash flow approach. For collateral dependent commercial loans and leases, the Company's process requires the Company to determine the fair value of the collateral by obtaining a third-party appraisal or asset valuation, an interim valuation analysis, blue book reference, or other internal methods. Fair value of the collateral for commercial loans is reevaluated quarterly. Whenever the Company has a third-party real estate appraisal performed by independent licensed appraisers, a licensed in-house appraisal officer or qualified individual reviews these appraisals for compliance with the Financial Institutions Reform Recovery and Enforcement Act and the Uniform Standards of Professional Appraisal Practice. Individual assessments for residential and home equity loans are based on a discounted cash flow approach or the fair value of collateral less the estimated costs to sell. Other consumer loans are individually assessed using a loss factor approach based on historical loss rates. For residential and consumer collateral dependent loans, a third-party appraisal is obtained upon loan default. Fair value of the collateral for residential and consumer collateral dependent loans is reevaluated every six months, by either obtaining a new appraisal or other internal valuation method. Fair value is also reassessed, with any excess amount charged off, for residential and home equity loans that reach 180 days past due per Federal Financial Institutions Examination Council guidelines. A fair value shortfall relative to the amortized cost balance is reflected as a valuation allowance within the ACL on loans and leases. Subsequent to an appraisal or other fair value estimate, should reliable information come to management's attention that the value has declined further, an additional allowance may be recorded to reflect the particular situation, thereby increasing the ACL on loans and leases. If the credit quality subsequently improves, the allowance is reversed up to a maximum of the previously recorded credit losses. Any individually assessed loan for which no specific valuation allowance is necessary is the result of either sufficient cash flow or sufficient collateral coverage relative to the amortized cost. Additional information regarding the ACL on loans and leases can be found within Note 4: Loans and Leases. Prior to the adoption of CECL on January 1, 2020, the ALLL was determined under the ALLL incurred loss model, which reflected management’s best estimate of probable losses that may be incurred within the existing loan and lease portfolio as of the balance sheet date. The ALLL consisted of three elements: (i) specific valuation allowances established for probable losses on impaired loans and leases; (ii) quantitative valuation allowances calculated using loss experience for like loans and leases with similar characteristics and trends, adjusted, as necessary, to reflect the impact of current conditions; and (iii) qualitative factors determined based on general economic conditions and other factors that may be internal or external to the Company. The reserve level reflected management’s view of trends in losses, portfolio quality, and economic, political, and regulatory conditions. While management utilized its best judgment based on the information available at the time, the ultimate adequacy of the allowance was dependent upon a variety of factors that were beyond the Company’s control, which included the performance its portfolio, economic conditions, interest rate sensitivity, and other external factors. The process for estimating probable losses under the ALLL approach was based on predictive models that measured the current risk profile of the loan and lease portfolio and combined the measurement with other quantitative and qualitative factors. To measure credit risk for the commercial, commercial real estate, and equipment financing portfolios, the Company employed a dual grade credit risk grading system for estimating the PD and the LGD. The credit risk grade system under the ALLL model is the same as described under the CECL approach. For the Company's consumer portfolio, credit risk factors are also consistent with the factors used in the CECL approach. Back-testing was performed to compare original estimated losses and actual observed losses, resulting in ongoing refinements. The balance resulting from this process, together with specific valuation allowances, determined the overall reserve level. Charge-off of Uncollectible Loans If all or a portion of a loan is deemed to be no longer collectible upon the occurrence of a loss-confirming event, a charge-off may be recognized. Charge-offs reduce the amortized cost basis of the loan with a corresponding reduction to the ACL. For commercial loans, loss confirming events usually involve the receipt of specific adverse information

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2022
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 each meet the definition of a variable interest entity. Information regarding the Company's consolidation of variable interest entities can be found within Note 1: Summary of Significant Accounting Policies. Consolidated Rabbi Trusts. The Company established a Rabbi Trust to meet its obligations due under the Webster Bank Deferred Compensation Plan for Directors and Officers and to mitigate expense volatility. The funding of the Rabbi Trust and the discontinuation of the Webster Bank Deferred Compensation Plan for Directors and Officers occurred during 2012. In connection with the Sterling merger, the Company acquired assets held in a separate Rabbi Trust that had been previously established to fund obligations due under the Greater New York Savings Bank Directors' Retirement Plan, which was also assumed from Sterling. Investments held in the Rabbi Trusts consist primarily of mutual funds that invest in equity and fixed income securities. The Company is considered the primary beneficiary of these Rabbi Trusts as it has the power to direct the activities of the Rabbi Trusts that most significantly impact its economic performance and it has the obligation to absorb losses and/or the right to receive benefits of the Rabbi Trusts that could potentially be significant. The Rabbi Trusts' assets are included in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. Investment earnings are included in Other income on the accompanying Consolidated Statements of Income, and depending on the nature of the underlying assets in the Rabbi Trusts, fair value changes are either recognized in Other income or in Other comprehensive (loss), net of tax, on the accompanying Consolidated Statements of Comprehensive Income. Additional information regarding the the Rabbi Trusts' investments can be found within Note 18: Fair Value Measurements. Non-Consolidated Tax Credit Finance Investments. The Company makes non-marketable equity investments in entities that sponsor affordable housing and other community development projects that qualify for the LIHTC Program pursuant to Section 42 of the Internal Revenue Code. The purpose of these investments is not only to assist the Bank in meeting its responsibilities under the CRA, but also to provide a return, primarily through the realization of tax benefits. 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 has determined that it is not the primary beneficiary due to its inability to direct the activities that most significantly impact economic performance and the Company does not have the obligation to absorb losses and/or the right to receive benefits. The Company applies the proportional amortization method to subsequently measure its investments in qualified affordable housing projects. The following table summarizes the Company's LIHTC investments and related unfunded commitments: At December 31, (In thousands) 2022 2021 Gross investment in LIHTC investments (1) $ 797,453 $ 68,635 Accumulated amortization (69,424) (25,216) Net investment in LIHTC investments $ 728,029 $ 43,419 Unfunded commitments for LIHTC investments (1) $ 335,959 $ 11,106 (1) The Company acquired $517.0 million of LIHTC investments and assumed $267.3 million of unfunded commitments for LIHTC investments in connection with the Sterling merger on January 31, 2022. The aggregate carrying value of the Company's LIHTC investments is included in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets, and represents the Company's maximum exposure to loss. The related unfunded commitments are included in Accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets. In addition to the LIHTC investments acquired from Sterling, there were $211.8 million and $10.1 million of net commitments approved to fund LIHTC investments during the years ended December 31, 2022, and 2021. 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 Company is not the primary beneficiary of Webster Statutory Trust. Webster Statutory Trust's only assets are junior subordinated debentures that are issued by the Company, which were acquired using the proceeds from the issuance of trust preferred securities and common stock. The junior subordinated debentures are included in Long-term debt on the accompanying Consolidated Balance Sheets, and the related interest expense is reported as Interest expense on Long-term debt on the accompanying Consolidated Statements of Income. Additional information regarding these junior subordinated debentures can be found within Note 11: Borrowings. Other Non-Marketable Investments. The Company invests in alternative investments comprising interests in non-public entities that cannot be redeemed since the investment is distributed as the underlying equity is liquidated. The ultimate timing and amount of these distributions cannot be predicted with reasonable certainty. For each of these alternative investments that is classified as a variable interest entity, the Company has determined that it is not the primary beneficiary due to its inability to direct the activities that most significantly impact economic performance. The aggregate carrying value of the Company's other

Mergers and Acquisitions

Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions Merger with Sterling On January 31, 2022, Webster completed its merger with Sterling pursuant to an Agreement and Plan of Merger dated as of April 18, 2021. Pursuant to the merger agreement, Sterling Bancorp merged with and into the Holding Company, with the Holding Company continuing as the surviving corporation. Following the merger, on February 1, 2022, Sterling National Bank, a wholly-owned subsidiary of Sterling Bancorp, merged with and into the Bank, with the Bank continuing as the surviving bank. Sterling was a full-service regional bank headquartered in Pearl River, New York, that primarily served the Greater New York metropolitan area. The merger expanded the Company's geographic footprint and combined two complementary organizations to create one of the largest commercial banks in the northeastern U.S. Pursuant to the merger agreement, each share of Sterling common stock issued and outstanding immediately prior to the merger, other than certain shares held by Webster and Sterling, was converted into the right to receive a fixed 0.4630 share of Webster common stock. Furthermore, certain equity awards granted under Sterling's equity compensation plans were converted into a corresponding award with respect to Webster common stock, generally subject to the same terms and conditions, with the number of shares underlying such awards adjusted based on the 0.4630 fixed exchange ratio. Cash was also paid to Sterling common stockholders in lieu of fractional shares, as applicable. In addition, each share of Sterling 6.50% Series A Non-Cumulative Perpetual Preferred Stock issued and outstanding immediately prior to the merger was converted into the right to receive one share of newly created Webster 6.50% Series G Non-Cumulative Perpetual Preferred Stock, having substantially the same terms. The following table summarizes the determination of the purchase price consideration: (In thousands, except share and per share data) Webster common stock issued 87,965,239 Price per share of Webster common stock on January 31, 2022 $ 56.81 Consideration for outstanding common stock 4,997,305 Consideration for preferred stock exchanged 138,942 Consideration for replacement equity awards (1) 43,877 Cash in lieu of fractional shares 176 Total purchase price consideration $ 5,180,300 (1) The fair value of the replacement equity awards issued by the Company and included in the consideration transferred pertains to services performed prior to the merger effective date. The fair value attributed to services performed after the merger effective date is being recognized over the required service vesting period for each award and recorded as Compensation and benefits expense on the accompanying Consolidated Statements of Income. The merger was accounted for as a business combination. Accordingly, the purchase price has been allocated to the assets acquired and liabilities assumed based on their fair values as of the merger effective date. The determination of fair value requires management to make estimates about discount rates, future expected cash flows, market conditions, and other future events that are highly subjective in nature and are subject to change. Fair value estimates of the assets acquired and liabilities assumed may be adjusted for a period up to one year (the measurement period) from the closing date of the merger if new information is obtained about facts and circumstances that existed as of the merger effective date that, if known, would have affected the measurement of the amounts recognized as of that date. The Company considers its valuations of certain other assets and other liabilities to be preliminary, as management continues to identify and assess information regarding the nature of these assets acquired and liabilities assumed, including extended information gathering, management review procedures, and any new information that may arise as a result of integration activities. Accordingly, the amounts recorded for current and deferred taxes are also considered preliminary, as the Company continues to evaluate the nature and extent of permanent and temporary differences between the book and tax bases of these other assets acquired and other liabilities assumed. While the Company believes that the information available as of The following table summarizes the preliminary allocation of the purchase price to the fair value of the identifiable assets acquired and liabilities assumed from Sterling: (In thousands) Unpaid Principal Balance Fair Value Purchase price consideration $ 5,180,300 Assets: Cash and due from banks 510,929 Interest-bearing deposits 3,207 Investment securities AFS 4,429,948 FHLB and FRB Stock 150,502 Loans held for sale 23,517 Loans and leases: Commercial non-mortgage $ 5,570,782 5,527,657 Asset-based 694,137 683,958 Commercial real estate 6,790,600 6,656,405 Multi-family 4,303,381 4,255,906 Equipment financing 1,350,579 1,314,311 Warehouse lending 647,767 643,754 Residential 1,313,785 1,281,637 Home equity 132,758 122,553 Other consumer 12,559 12,525 Total loans and leases $ 20,816,348 20,498,706 Deferred tax assets, net (51,487) Premises and equipment (1) 264,421 Other intangible assets 210,100 Bank-owned life insurance policies 645,510 Accrued interest receivable and other assets 960,893 Total assets acquired $ 27,646,246 Liabilities: Non-interest-bearing deposits $ 6,620,248 Interest-bearing deposits 16,643,755 Securities sold under agreements to repurchase and other borrowings 27,184 Long-term debt 516,881 Accrued expenses and other liabilities (1) 597,643 Total liabilities assumed $ 24,405,711 Net assets acquired 3,240,535 Goodwill $ 1,939,765 (1) Includes $100.0 million of ROU lease assets operating lease liabilities In connection with the merger with Sterling, the Company recorded $1.9 billion of goodwill, which represents the excess of the purchase price over the fair value of the net assets acquired. Information regarding the allocation of goodwill to the Company's reportable segments, as well as the carrying amounts and amortization of the core deposit intangible asset and customer relationship intangible assets, can be found within Note 21: Segment Reporting and Note 8: Goodwill and Other Intangible Assets, respectively. The following is a description of the valuation methodologies used to estimate the fair values of the significant assets acquired and liabilities assumed: Cash and due from banks and interest-bearing deposits. The carrying amount of these assets is a reasonable estimate of fair value based on the short-term nature of these assets. Investment securities AFS. The fair values for investment securities AFS were based on quoted market prices, where available. If quoted market prices were not available, fair value estimates are based on observable inputs, including quoted market prices for similar instruments. Investment securities HTM were classified as investment securities AFS based on the Company's intent at closing. Loans and leases. The fair values for loans and leases were estimated using a discounted cash flow methodology that considered factors including the type of loan or lease and the related collateral, classification status, fixed or variable interest rate, remaining term, amortization status, and current discount rates. In addition, the PD, LGD, and prepayment assumptions that were derived based on loan and lease characteristics, historical loss experience, comparable market data, and current and forecasted economic conditions were used to estimate expected credit losses. Loans and leases generally were valued individually. The discount rates used for loans and leases were based on current market rates for new originations or comparable loans and leases and include adjustments for liquidity. The discount rate did not include credit losses as that was included as a reduction to the estimated cash flows. Premises and equipment. The fair values for land and buildings were based on appraised values using the cost approach, which estimates the price a buyer would pay if they were to rebuild or reconstruct a similar property on a comparable piece of land. Intangible assets. A core deposit intangible asset represents the value of relationships with deposit clients. The fair value of the core deposit intangible asset was estimated using a net cost savings method, a form of discounted cash flow methodology that gave appropriate consideration to expected client attrition rates and other applicable adjustments to the projected deposit balance, the interest cost and net maintenance cost associated with the client deposit base, alternative cost of funds, and a discount rate used to discount the future economic benefits of the core deposit intangible asset to present value. The core deposit intangible asset is being amortized on an accelerated basis over 10 years based upon the period over which the estimated economic benefits are estimated to be received. Customer relationship intangible assets for payroll finance, factoring receivables finance, and wealth businesses were estimated using a discounted cash flow methodology that reflects the estimated value of the future net earnings for each relationship with adjustments for attrition. The customer relationship intangible assets are being amortized on an accelerated basis over their estimated useful life of 10 years. Bank-owned life insurance policies. The cash surrender value of these insurance policies is a reasonable estimate of fair value since it reflects the amount that would be realized by the contract owner upon discontinuance or surrender. Deposits. The fair values used for the demand and savings deposits by definition equal the amount payable on demand at the merger date. The fair values for time deposits were estimated using a discounted cash flow methodology that applies interest rates currently being offered to the contractual interest rates on such time deposits. Securities sold under agreements to repurchase and other borrowings. The carrying amount of these liabilities is a reasonable estimate of fair value based on the short-term nature of these liabilities. Long-term debt. The fair values of long-term debt instruments are estimated based on quoted market prices for the instrument, if available, or for similar instruments, if not available, or by using a discounted cash flow methodology based on current incremental borrowing rates for similar types of instruments. PCD Loans and Leases Purchased loans and leases that have experienced more-than-insignificant deterioration in credit quality since origination are considered PCD. For PCD loans and leases, the initial estimate of expected credit losses was established through an adjustment to the unpaid principal balance and non-credit discount at acquisition. Subsequent to the merger effective date, the Company recorded an ACL for non-PCD loans and leases of $175.1 million through an increase to the provision for credit losses. There was no carryover of Sterling's previously recorded ACL on loans and leases. The following table reconciles the unpaid principal balance to the fair value of PCD loans and leases by portfolio segment: (In thousands) Commercial Consumer Total Unpaid principal balance $ 3,394,963 $ 541,471 $ 3,936,434 ACL at acquisition (115,464) (20,852) (136,316) Non-credit (discount) (40,947) (2,784) (43,731) Fair value 3,238,552 517,835 3,756,387 Supplemental Pro Forma Financial Information (Unaudited) The following table summarizes supplemental pro forma financial information giving effect to the merger as if it had been completed on January 1, 2021: Years ended December 31, (In thousands) 2022 2021 Net interest income $ 1,961,005 $ 1,802,862 Non-interest income 440,783 487,301 Net income 869,639 574,927 The supplemental pro forma financial information does not necessarily reflect the results of operations that would have occurred had Webster merged with Sterling on January 1, 2021. The supplemental pro forma financial information includes the impact of (i) accreting and amortizing the discounts and premiums associated with the estimated fair value adjustments to acquired loans and leases, investment securities, deposits, and long-term debt, (ii) the amortization of recognized intangible assets, (iii) the elimination of Sterling's historical accretion and amortization of discounts and premiums and deferred origination fees and costs on loans and leases, (iv) the elimination of Sterling's historical accretion and amortization of discounts and premiums on investment securities, and (v) the related estimated income tax effects. Costs savings and other business synergies related to the merger are not included in the supplemental pro forma financial information. In addition, the supplemental pro forma financial information was adjusted for merger-related expenses, as follows: Years ended December 31, (In thousands) 2022 2021 Compensation and benefits (1) $ 79,001 $ 13,987 Occupancy (2) 36,586 256 Technology and equipment (3) 24,688 290 Marketing 416 — Professional and outside services (4) 73,070 22,273 Other expense (5) 32,700 648 Total merger-related expenses $ 246,461 $ 37,454 (1) Comprised primarily of employee severance and retention costs, and executive restricted stock awards. (2) Comprised primarily of charges associated with the Company’s 2022 corporate real estate consolidation plan. Additional information regarding this corporate real estate consolidation plan can be found within Note 6: Premises and Equipment and (3) Comprised primarily of technology contract termination costs. (4) Comprised primarily of advisory, legal, and consulting fees. (5) Comprised primarily of disposals on property and equipment, contract termination costs, and other miscellaneous expenses. The following table summarizes the change in accrued expenses and other liabilities for the year ended December 31, 2022, as it relates to severance and contract termination costs, which were primarily incurred in connection with the Sterling merger: (In thousands) Severance Contract Termination Total Balance, beginning of period $ 10,835 $ — $ 10,835 Additions charged to expense 36,092 34,152 70,244 Cash payments (35,014) (3,790) (38,804) Other (1) (4,330) — (4,330) Balance, end of period $ 7,583 $ 30,362 $ 37,945 (1) Primarily reflects the release of $4.1 million from the Company's severance accrual at the beginning of the year. In connection with the Sterling merger, the Company re-evaluated its strategic priorities as a combined organization, which resulted in modifications to the Company's strategic initiatives that were announced in December 2020. The Company's operating results for the year ended December 31, 2022, includes the operating results of acquired assets and assumed liabilities of Sterling subsequent to the merger on January 31, 2022. Due to the various conversions of Sterling systems during the year ended December 31, 2022, as well as other streamlining and integration of operating activities into those of the Company, historical reporting for the former Sterling operations after January 31, 2022, is impracticable, and thus disclosures of Sterling's revenue and earnings since the merger effective date that are included in the accompanying Consolidated Statements of Income for the reporting period is impracticable. Bend Acquisition On February 18, 2022, Webster acquired 100% of the equity interests of Bend, a cloud-based platform solution provider for HSAs, in exchange for cash of $55.3 million. The acquisition accelerated the Company’s efforts underway to deliver enhanced user experiences at HSA Bank. The transaction was accounted for as a business combination, and resulted in the addition of $19.3 million in net assets, which primarily comprised $15.9 million of internal use software and a $3.0 million customer relationship intangible asset. Inland Bank and Trust HSA Portfolio Acquisition On November 7, 2022, Webster acquired a portfolio of HSAs from Inland Bank and Trust. The transaction was accounted for as an asset acquisition, and the Company received $15.6 million in both cash and deposits on the acquisition date. The Company also paid a 2.00% deposit premium based on the final settlement of deposits, which resulted in the recognition of a $0.3 million core deposit intangible asset. The accounts and associated deposits obtained from this transaction will provide stable funding for future loan growth and will increase the Company's revenues. interLINK Acquisition On January 11, 2023, Webster acquired interLINK, a technology-enabled deposit management platform that administers over $9 billion of deposits from FDIC-insured cash sweep programs between banks and broker/dealers and clearing firms, in exchange for cash. The acquisition provides the Company with access to a unique source of core deposit funding and scalable liquidity and adds another technology-enabled channel to its already differentiated, omnichannel deposit gathering capabilities. The transaction will be accounted for as a business combination, and the assets acquired and liabilities assumed from interLINK will be recorded at fair value as of the acquisition date. The Company plans to complete the initial purchase price allocation in the first quarter of 2023, which is not expected to have a material impact on the Company's consolidated financial statements.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Available-for-Sale The following table summarizes the amortized cost and fair value of AFS securities by major type: At December 31, 2022 (In thousands) Amortized Unrealized Unrealized Losses Fair Value U.S. Treasury notes $ 755,968 $ — $ (38,928) $ 717,040 Government agency debentures 302,018 — (43,644) 258,374 Municipal bonds and notes 1,719,110 5 (85,913) 1,633,202 Agency CMO 64,984 — (5,019) 59,965 Agency MBS 2,461,337 26 (303,339) 2,158,024 Agency CMBS 1,664,600 — (258,114) 1,406,486 CMBS 929,588 — (32,948) 896,640 CLO 2,108 — (1) 2,107 Corporate debt 795,999 — (91,587) 704,412 Private label MBS 48,895 — (4,646) 44,249 Other 12,548 — (350) 12,198 Total AFS securities $ 8,757,155 $ 31 $ (864,489) $ 7,892,697 At December 31, 2021 (In thousands) Amortized Unrealized Unrealized Losses Fair Value U.S. Treasury notes $ 398,664 $ — $ (1,698) $ 396,966 Agency CMO 88,109 2,326 (51) 90,384 Agency MBS 1,568,293 36,130 (11,020) 1,593,403 Agency CMBS 1,248,548 2,537 (18,544) 1,232,541 CMBS 887,640 506 (1,883) 886,263 CLO 21,860 — (13) 21,847 Corporate debt 14,583 — (1,133) 13,450 Total AFS securities $ 4,227,697 $ 41,499 $ (34,342) $ 4,234,854 Accrued interest receivable on AFS securities of $36.9 million and $7.5 million at December 31, 2022, and 2021, respectively, is excluded from amortized cost and is reported in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. Unrealized Losses The following tables summarize the gross unrealized losses and fair value of AFS securities by length of time each major security type has been in a continuous unrealized loss position: At December 31, 2022 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ 337,563 $ (19,167) $ 379,477 $ (19,761) 23 $ 717,040 $ (38,928) Government agency debentures 258,374 (43,644) — — 19 258,374 (43,644) Municipal bonds and notes 1,616,771 (85,913) — — 444 1,616,771 (85,913) Agency CMO 55,693 (4,640) 4,272 (379) 39 59,965 (5,019) Agency MBS 1,641,544 (206,412) 515,206 (96,927) 460 2,156,750 (303,339) Agency CMBS 485,333 (68,674) 921,153 (189,440) 132 1,406,486 (258,114) CMBS 273,150 (8,982) 598,490 (23,966) 52 871,640 (32,948) CLO — — 2,107 (1) 1 2,107 (1) Corporate debt 692,990 (89,692) 8,421 (1,895) 105 701,411 (91,587) Private label MBS 44,249 (4,646) — — 3 44,249 (4,646) Other 12,198 (350) — — 4 12,198 (350) Total AFS securities in an unrealized loss position $ 5,417,865 $ (532,120) $ 2,429,126 $ (332,369) 1,282 $ 7,846,991 $ (864,489) At December 31, 2021 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ 396,966 $ (1,698) $ — $ — 8 $ 396,966 $ (1,698) Agency CMO 7,895 (51) — — 2 7,895 (51) Agency MBS 506,602 (7,354) 110,687 (3,666) 70 617,289 (11,020) Agency CMBS 632,213 (6,163) 335,480 (12,381) 28 967,693 (18,544) CMBS 724,762 (1,744) 81,253 (139) 50 806,015 (1,883) CLO — — 21,848 (13) 1 21,848 (13) Corporate debt 4,203 (76) 9,247 (1,057) 3 13,450 (1,133) Total AFS securities in an unrealized loss position $ 2,272,641 $ (17,086) $ 558,515 $ (17,256) 162 $ 2,831,156 $ (34,342) The Company assesses each AFS security that is in an unrealized loss position to determine whether the decline in fair value below the amortized cost basis is attributable to credit or other factors. The $830.1 million increase in gross unrealized losses from December 31, 2021, to December 31, 2022, is primarily due to higher market rates. Market prices will approach par as the securities approach maturity. At December 31, 2022, the Company had the intent to hold its AFS securities with unrealized loss positions through the anticipated recovery period, and it is more-likely-than-not that the Company would not have to sell these AFS securities before the recovery of their amortized cost basis. The issuers of these AFS securities have not, to the Company’s knowledge, established any cause for default. Therefore, the Company expects to recover the entire amortized cost basis. Accordingly, there were no AFS securities in non-accrual status and no ACL recorded on AFS securities at December 31, 2022, and 2021. Contractual Maturities The following table summarizes the amortized cost and fair value of AFS securities by contractual maturity: At December 31, 2022 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 204,757 $ 198,765 After 1 year through 5 years 1,200,088 1,127,769 After 5 years through 10 years 1,459,962 1,351,397 After 10 years 5,892,348 5,214,766 Total AFS securities $ 8,757,155 $ 7,892,697 AFS 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 categorization as borrowers have the right to repay their obligations with or without prepayment penalties. Sales of Available-for Sale Securities The following table summarizes information from sales of AFS securities: Years ended December 31, (In thousands) 2022 2021 2020 Proceeds from sales $ 172,947 $ — $ 8,963 Gross realized gains $ — $ — $ 8 Gross realized losses 6,751 — — (Loss) gain on sale of investment securities, net $ (6,751) $ — $ 8 Other Information The following table summarizes AFS securities pledged for deposits, borrowings, and other purposes: At December 31, (In thousands) 2022 2021 AFS securities pledged for deposits, at fair value $ 2,573,072 $ 855,323 AFS securities pledged for borrowings and other, at fair value 1,195,101 924,841 Total AFS securities pledged $ 3,768,173 $ 1,780,164 At December 31, 2022, the Company had callable AFS securities with an aggregate carrying value of $2.9 billion. Held-to-Maturity The following table summarizes the amortized cost, fair value, and ACL of HTM securities by major type: At December 31, 2022 (In thousands) Amortized Unrealized Gains Unrealized Losses Fair Value Allowance Net Carrying Value Agency CMO $ 28,358 $ — $ (2,060) $ 26,298 $ — $ 28,358 Agency MBS 2,626,114 827 (339,592) 2,287,349 — 2,626,114 Agency CMBS 2,831,949 845 (407,648) 2,425,146 — 2,831,949 Municipal bonds and notes 928,845 1,098 (47,183) 882,760 182 928,663 CMBS 149,613 — (9,713) 139,900 — 149,613 Total HTM securities $ 6,564,879 $ 2,770 $ (806,196) $ 5,761,453 $ 182 $ 6,564,697 At December 31, 2021 (In thousands) Amortized Unrealized Gains Unrealized Losses Fair Value Allowance Net Carrying Value Agency CMO $ 42,405 $ 655 $ (25) $ 43,035 $ — $ 42,405 Agency MBS 2,901,593 71,444 (11,788) 2,961,249 — 2,901,593 Agency CMBS 2,378,475 11,202 (43,844) 2,345,833 — 2,378,475 Municipal bonds and notes 705,918 51,572 — 757,490 214 705,704 CMBS 169,948 3,381 — 173,329 — 169,948 Total HTM securities $ 6,198,339 $ 138,254 $ (55,657) $ 6,280,936 $ 214 $ 6,198,125 Accrued interest receivable on HTM securities of $24.2 million and $21.2 million at December 31, 2022, and 2021, respectively, is excluded from amortized cost and is reported in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. An ACL on HTM securities is recorded for certain Municipal bonds and notes to account for expected lifetime credit losses. 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. HTM securities with gross unrealized losses and no ACL are considered to be of high credit quality. Therefore, zero credit loss is recorded at December 31, 2022, and 2021. The following table summarizes the activity in the ACL on HTM securities: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 214 $ 299 $ — Adoption of CECL — — 397 (Benefit) for credit losses (32) (85) (98) Balance, end of period $ 182 $ 214 $ 299 Contractual Maturities The following table summarizes the amortized cost and fair value of HTM securities by contractual maturity: At December 31, 2022 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 2,195 $ 2,194 After 1 year through 5 years 53,632 54,275 After 5 years through 10 years 329,156 312,741 After 10 years 6,179,896 5,392,243 Total HTM securities $ 6,564,879 $ 5,761,453 HTM 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 categorization as borrowers have the right to prepay their obligations with or without prepayment penalties. Credit Quality Information The Company monitors the credit quality of HTM securities through credit ratings provided by S&P, Moody's, Fitch Ratings, Inc., Kroll Bond Rating Agency, or DBRS Inc. Credit ratings express opinions about the credit quality of a security, and are updated at each quarter end. 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, which are labeled as speculative grade by the rating agencies, are considered to have distinctively higher credit risk than investment grade securities. There were no speculative grade HTM securities at December 31, 2022, and 2021. HTM securities that are not rated are collateralized with U.S. Treasury obligations. The following table summarizes the amortized cost basis of HTM securities based on their lowest publicly available credit rating: At December 31, 2022 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 Baa2 Not Rated Agency CMOs $ — $ 28,358 $ — $ — $ — $ — $ — $ — Agency MBS — 2,626,114 — — — — — — Agency CMBS — 2,831,949 — — — — — — Municipal bonds and notes 336,035 163,312 255,235 116,870 38,177 4,165 — 15,051 CMBS 149,613 — — — — — — — Total HTM securities $ 485,648 $ 5,649,733 $ 255,235 $ 116,870 $ 38,177 $ 4,165 $ — $ 15,051 At December 31, 2021 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 Baa2 Not Rated Agency CMOs $ — $ 42,405 $ — $ — $ — $ — $ — $ — Agency MBS — 2,901,593 — — — — — — Agency CMBS — 2,378,475 — — — — — — Municipal bonds and notes 207,426 119,804 227,106 104,232 35,878 8,260 95 3,117 CMBS 169,948 — — — — — — — Total HTM securities $ 377,374 $ 5,442,277 $ 227,106 $ 104,232 $ 35,878 $ 8,260 $ 95 $ 3,117 At December 31, 2022, and 2021, there were no HTM debt securities past due under the terms of their agreements or in Other Information The following table summarizes HTM securities pledged for deposits, borrowings, and other purposes: At December 31, (In thousands) 2022 At 2021 HTM securities pledged for deposits, at amortized cost $ 1,596,777 $ 1,834,117 HTM securities pledged for borrowings and other, at amortized cost 260,735 1,243,139 Total HTM securities pledged $ 1,857,512 $ 3,077,256 At December 31, 2022, the Company had callable HTM securities with an aggregate carrying value of $0.9 billion.

Loans and Leases

Loans and Leases	12 Months Ended
	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	Loans and Leases The following table summarizes loans and leases by portfolio segment and class: At December 31, (In thousands) 2022 2021 Commercial non-mortgage $ 16,392,795 $ 6,882,480 Asset-based 1,821,642 1,067,248 Commercial real estate 12,997,163 5,463,321 Multi-family 6,621,982 1,139,859 Equipment financing 1,628,393 627,058 Warehouse lending 641,976 — Commercial portfolio 40,103,951 15,179,966 Residential 7,963,420 5,412,905 Home equity 1,633,107 1,593,559 Other consumer 63,948 85,299 Consumer portfolio 9,660,475 7,091,763 Loans and leases $ 49,764,426 $ 22,271,729 The carrying amount of loans and leases at December 31, 2022, and 2021, includes net unamortized (discounts)/premiums and net unamortized deferred (fees)/costs totaling $(68.7) million and $12.3 million, respectively. Accrued interest receivable of $226.3 million and $50.7 million at December 31, 2022, and 2021, respectively, is excluded from the carrying amount of loans and leases and is reported within Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. At December 31, 2022, the Company had pledged $13.7 billion of eligible loans as collateral to support borrowing capacity at the FHLB. Non-Accrual and Past Due Loans and Leases The following tables summarize the aging of accrual and non-accrual loans and leases by class: At December 31, 2022 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Current (1) Total Loans Commercial non-mortgage $ 8,434 $ 821 $ 645 $ 71,884 $ 81,784 $ 16,311,011 $ 16,392,795 Asset-based 5,921 — — 20,024 25,945 1,795,697 1,821,642 Commercial real estate 1,494 23,492 68 39,057 64,111 12,933,052 12,997,163 Multi-family 1,157 — — 636 1,793 6,620,189 6,621,982 Equipment financing 806 9,988 — 12,344 23,138 1,605,255 1,628,393 Warehouse lending — — — — — 641,976 641,976 Commercial portfolio 17,812 34,301 713 143,945 196,771 39,907,180 40,103,951 Residential 8,246 3,083 — 25,424 36,753 7,926,667 7,963,420 Home equity 5,293 2,820 — 27,924 36,037 1,597,070 1,633,107 Other consumer 1,028 85 13 148 1,274 62,674 63,948 Consumer portfolio 14,567 5,988 13 53,496 74,064 9,586,411 9,660,475 Total $ 32,379 $ 40,289 $ 726 $ 197,441 $ 270,835 $ 49,493,591 $ 49,764,426 (1) At December 31, 2022, there were $28.5 million of commercial loans that had reached their contractual maturity but were actively in the process of being refinanced with the Company. Due to the status of the refinancing, these commercial loans have been reported as current in the table above. In January 2023, $26.8 million were approved and refinanced. At December 31, 2021 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Current Total Loans Commercial non-mortgage $ 3,729 $ 4,524 $ 1,977 $ 59,607 $ 69,837 $ 6,812,643 $ 6,882,480 Asset-based — — — 2,086 2,086 1,065,162 1,067,248 Commercial real estate 508 417 519 5,046 6,490 5,456,831 5,463,321 Multi-family — — — — — 1,139,859 1,139,859 Equipment financing 1,034 — — 3,728 4,762 622,296 627,058 Commercial portfolio 5,271 4,941 2,496 70,467 83,175 15,096,791 15,179,966 Residential 3,212 368 — 15,747 19,327 5,393,578 5,412,905 Home equity 3,467 1,600 — 23,489 28,556 1,565,003 1,593,559 Other consumer 379 181 — 224 784 84,515 85,299 Consumer portfolio 7,058 2,149 — 39,460 48,667 7,043,096 7,091,763 Total $ 12,329 $ 7,090 $ 2,496 $ 109,927 $ 131,842 $ 22,139,887 $ 22,271,729 The following table provides additional information on non-accrual loans and leases: At December 31, 2022 2021 (In thousands) Non-accrual Non-accrual With No Allowance Non-accrual Non-accrual With No Allowance Commercial non-mortgage $ 71,884 $ 12,598 $ 59,607 $ 4,802 Asset-based 20,024 1,491 2,086 2,086 Commercial real estate 39,057 90 5,046 4,310 Multi-family 636 — — — Equipment financing 12,344 2,240 3,728 — Commercial portfolio 143,945 16,419 70,467 11,198 Residential 25,424 10,442 15,747 10,584 Home equity 27,924 15,193 23,489 18,920 Other consumer 148 5 224 2 Consumer portfolio 53,496 25,640 39,460 29,506 Total $ 197,441 $ 42,059 $ 109,927 $ 40,704 Interest on non-accrual loans and leases that would have been recognized as additional interest income had the loans and leases been current in accordance with their original terms totaled $16.9 million, $11.0 million, and $9.7 million for the years ended December 31, 2022, 2021, and 2020, respectively. Allowance for Credit Losses on Loans and Leases The following tables summarize the change in the ACL on loans and leases by portfolio segment: At or for the Years ended December 31, 2022 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 257,877 $ 43,310 $ 301,187 $ 312,244 $ 47,187 $ 359,431 $ 161,669 $ 47,427 $ 209,096 Initial allowance for PCD loans and leases (1) 78,376 9,669 88,045 — — — — — — Adoption of CECL — — — — — — 34,024 23,544 57,568 Provision (benefit) 268,295 4,502 272,797 (48,651) (5,764) (54,415) 156,336 (18,488) 137,848 Charge-offs (82,860) (4,662) (87,522) (9,437) (9,217) (18,654) (42,925) (12,408) (55,333) Recoveries 11,437 8,797 20,234 3,721 11,104 14,825 3,140 7,112 10,252 Balance, end of period $ 533,125 $ 61,616 $ 594,741 $ 257,877 $ 43,310 $ 301,187 $ 312,244 $ 47,187 $ 359,431 Individually assessed for credit losses 34,793 12,441 47,234 16,965 4,108 21,073 11,687 4,450 16,137 Collectively assessed for credit losses $ 498,332 $ 49,175 $ 547,507 $ 240,912 $ 39,202 $ 280,114 $ 300,557 $ 42,737 $ 343,294 (1) Represents the establishment of the initial reserve for PCD loans and leases, which is reported net of $48.3 million of day one charge-offs recognized at the date of acquisition in accordance with GAAP. 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. A (7) "Special Mention" rating has a potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the asset. A (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 asset with the added characteristic that the weakness makes collection or liquidation in full given current facts, conditions, and values improbable. Assets classified as a (10) "Loss" rating are considered uncollectible and are charged-off. Risk ratings, which are assigned to differentiate risk within the portfolio, are reviewed on an ongoing basis and revised to reflect changes in a borrower's current financial position and outlook, risk profile, and the related collateral and structural position. Loan officers review updated financial information or other loan factors on at least an annual basis for all pass rated loans to assess the accuracy of the risk grade. Criticized loans undergo more frequent reviews and enhanced monitoring. The following tables summarize the amortized cost basis of commercial loans and leases by Composite Credit Risk Profile grade and origination year: At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 5,154,781 $ 1,952,158 $ 965,975 $ 792,977 $ 593,460 $ 780,200 $ 5,670,532 $ 15,910,083 Special mention 104,277 15,598 21,168 263 14,370 7,770 40,142 203,588 Substandard 28,203 11,704 69,954 36,604 70,634 16,852 41,917 275,868 Doubtful — — — 1 — — 3,255 3,256 Commercial non-mortgage 5,287,261 1,979,460 1,057,097 829,845 678,464 804,822 5,755,846 16,392,795 Asset-based: Pass 19,659 3,901 9,424 14,413 5,163 55,553 1,551,250 1,659,363 Special mention — — — — — — 80,476 80,476 Substandard — — — 1,491 — — 80,312 81,803 Asset-based 19,659 3,901 9,424 15,904 5,163 55,553 1,712,038 1,821,642 Commercial real estate: Pass 3,420,635 2,246,672 1,556,185 1,605,869 1,058,730 2,681,052 97,832 12,666,975 Special mention 21,878 8,995 7,264 37,570 47,419 66,652 1,000 190,778 Substandard 519 2,459 216 31,163 47,021 57,997 — 139,375 Doubtful — — — 1 — 34 — 35 Commercial real estate 3,443,032 2,258,126 1,563,665 1,674,603 1,153,170 2,805,735 98,832 12,997,163 Multi-family: Pass 1,992,980 1,057,705 507,065 694,066 444,564 1,748,337 51,655 6,496,372 Special mention 37,677 — — 95 40,307 726 8,838 87,643 Substandard — — 382 — 12,681 24,904 — 37,967 Multi-family 2,030,657 1,057,705 507,447 694,161 497,552 1,773,967 60,493 6,621,982 Equipment financing: Pass 388,641 345,792 331,419 308,441 98,874 83,264 — 1,556,431 Special mention — 185 — 11,965 6,775 25 — 18,950 Substandard 314 16,711 18,436 5,016 5,307 7,228 — 53,012 Equipment financing 388,955 362,688 349,855 325,422 110,956 90,517 — 1,628,393 Warehouse lending: Pass — — — — — — 641,976 641,976 Warehouse lending — — — — — — 641,976 641,976 Commercial portfolio $ 11,169,564 $ 5,661,880 $ 3,487,488 $ 3,539,935 $ 2,445,305 $ 5,530,594 $ 8,269,185 $ 40,103,951 At December 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 2,270,320 $ 1,179,620 $ 757,343 $ 581,633 $ 292,637 $ 275,789 $ 1,182,562 $ 6,539,904 Special mention 14,216 22,892 37,877 15,575 9,721 15,399 27,808 143,488 Substandard 3,660 46,887 30,437 69,963 5,255 19,483 23,403 199,088 Commercial non-mortgage 2,288,196 1,249,399 825,657 667,171 307,613 310,671 1,233,773 6,882,480 Asset-based: Pass 7,609 19,141 12,810 13,456 6,113 25,850 920,496 1,005,475 Special mention — — — 675 — — 59,012 59,687 Substandard — — 2,086 — — — — 2,086 Asset-based 7,609 19,141 14,896 14,131 6,113 25,850 979,508 1,067,248 Commercial real estate: Pass 1,152,431 733,220 1,146,149 594,180 384,664 1,136,384 55,044 5,202,072 Special mention 95 3,084 — 84,475 51,536 79,096 — 218,286 Substandard — 82 227 373 13,874 28,407 — 42,963 Commercial real estate 1,152,526 736,386 1,146,376 679,028 450,074 1,243,887 55,044 5,463,321 Multi-family: Pass 222,875 135,924 185,087 322,688 17,054 203,558 566 1,087,752 Special mention — — — 35,201 — — — 35,201 Substandard — 400 — 6,933 — 9,573 — 16,906 Multi-family 222,875 136,324 185,087 364,822 17,054 213,131 566 1,139,859 Equipment financing: Pass 231,762 188,031 93,547 41,276 14,864 32,588 — 602,068 Special mention — 108 2,229 3,341 — 600 — 6,278 Substandard — 8,388 4,756 2,612 332 2,624 — 18,712 Equipment financing 231,762 196,527 100,532 47,229 15,196 35,812 — 627,058 Commercial portfolio $ 3,902,968 $ 2,337,777 $ 2,272,548 $ 1,772,381 $ 796,050 $ 1,829,351 $ 2,268,891 $ 15,179,966 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 and a higher FICO score is indicative of lower credit risk. FICO scores are updated at least on a quarterly basis. The following tables summarize the amortized cost basis of consumer loans by FICO score and origination year: At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Residential: 800+ $ 527,408 $ 954,568 $ 469,518 $ 160,596 $ 28,361 $ 997,409 $ — $ 3,137,860 740-799 963,026 946,339 311,295 111,913 43,684 689,771 — 3,066,028 670-739 381,515 350,671 103,999 62,365 18,451 384,687 — 1,301,688 580-669 40,959 49,648 14,484 5,836 2,357 138,107 — 251,391 579 and below 52,464 3,693 2,057 84,032 1,299 62,908 — 206,453 Residential 1,965,372 2,304,919 901,353 424,742 94,152 2,272,882 — 7,963,420 Home equity: 800+ 25,475 35,129 25,612 7,578 12,545 55,352 465,318 627,009 740-799 26,743 35,178 17,621 8,111 7,765 32,270 398,692 526,380 670-739 18,396 16,679 8,175 3,635 7,614 30,060 259,646 344,205 580-669 2,848 3,068 1,520 1,456 1,163 13,607 76,614 100,276 579 and below 426 386 651 661 563 4,736 27,814 35,237 Home equity 73,888 90,440 53,579 21,441 29,650 136,025 1,228,084 1,633,107 Other consumer: 800+ 495 218 544 1,045 247 56 19,196 21,801 740-799 888 2,624 1,959 2,494 941 364 12,218 21,488 670-739 977 603 2,480 4,238 1,041 118 6,107 15,564 580-669 211 117 337 801 173 54 2,223 3,916 579 and below 169 101 29 116 36 21 707 1,179 Other consumer 2,740 3,663 5,349 8,694 2,438 613 40,451 63,948 Consumer portfolio 2,042,000 2,399,022 960,281 454,877 126,240 2,409,520 1,268,535 9,660,475 At December 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Residential: 800+ $ 590,238 $ 428,118 $ 161,664 $ 35,502 $ 105,198 $ 735,517 $ — $ 2,056,237 740-799 1,083,608 421,380 154,960 32,172 95,662 456,722 — 2,244,504 670-739 374,460 135,146 73,499 25,099 34,550 227,863 — 870,617 580-669 38,644 13,782 9,348 3,056 9,000 71,811 — 145,641 579 and below 9,478 1,051 49,252 390 2,519 33,216 — 95,906 Residential 2,096,428 999,477 448,723 96,219 246,929 1,525,129 — 5,412,905 Home equity: 800+ 35,678 30,157 9,591 16,347 11,068 58,189 463,334 624,364 740-799 42,430 22,030 9,413 13,317 7,711 33,777 409,518 538,196 670-739 17,493 9,162 5,889 8,220 5,802 31,160 233,744 311,470 580-669 1,773 1,397 1,298 1,066 1,329 15,042 66,361 88,266 579 and below 380 446 725 1,060 434 5,666 22,552 31,263 Home equity 97,754 63,192 26,916 40,010 26,344 143,834 1,195,509 1,593,559 Other consumer: 800+ 463 1,343 2,398 916 231 118 10,160 15,629 740-799 2,588 5,408 8,303 2,985 379 77 9,528 29,268 670-739 1,061 7,034 13,602 3,859 607 412 5,644 32,219 580-669 256 1,083 2,550 735 216 211 1,267 6,318 579 and below 147 87 215 159 40 21 1,196 1,865 Other consumer 4,515 14,955 27,068 8,654 1,473 839 27,795 85,299 Consumer portfolio 2,198,697 1,077,624 502,707 144,883 274,746 1,669,802 1,223,304 7,091,763 Collateral Dependent Loans and Leases A loan or lease is considered collateral dependent when the borrower is experiencing financial difficulty and repayment is substantially expected to be provided through the operation or sale of collateral. At December 31, 2022, and 2021, the carrying amount of collateral dependent commercial loans and leases totaled $43.8 million and $16.6 million, respectively, and the carrying amount of collateral dependent consumer loans totaled $45.2 million and $34.9 million, respectively. Commercial Troubled Debt Restructurings The following table summarizes information related to TDRs: At December 31, (In thousands) 2022 2021 Accrual status $ 110,868 $ 110,625 Non-accrual status 83,954 52,719 Total TDRs $ 194,822 $ 163,344 Additional funds committed to borrowers in TDR status $ 1,724 $ 5,975 Specific reserves for TDRs included in the ACL on loans and leases: Commercial portfolio $ 14,578 $ 9,017 Consumer portfolio 3,559 3,745 During the years ended December 31, 2022, 2021, and 2020, the portion of TDRs deemed to be uncollectible and charged-off totaled $14.7 million, $3.0 million, $17.6 million for the commercial portfolio, respectively, and $0.3 million, $0.4 million, and $0.8 million for the consumer portfolio, respectively. The following table summarizes loans and leases modified as TDRs by class and modification type: Years ended December 31, 2022 2021 2020 Number of Recorded Investment (1) Number of Recorded Investment (1) Number of Recorded Investment (1) (Dollars in thousands) Commercial non-mortgage: Extended maturity 5 $ 291 8 $ 605 11 $ 1,070 Adjusted interest rate — — — — 1 96 Maturity / rate combined 8 765 9 352 7 607 Other (2) 19 52,070 12 14,160 24 40,128 Asset-based: Other (2) 1 23,298 — — — — Commercial real estate: Extended maturity — — 1 183 1 72 Maturity / rate combined — — — — 2 377 Other (2) — — 1 1,582 3 306 Equipment financing: Other (2) 3 1,692 — — — — Residential: Extended maturity 2 1,185 1 99 3 485 Maturity / rate combined 2 133 2 401 10 1,133 Other (2) 8 3,158 3 280 26 4,215 Home equity: Extended maturity — — 85 1,809 3 188 Adjusted interest rate 1 74 — — — — Maturity / rate combined 21 2,623 6 1,025 5 334 Other (2) 37 2,134 22 1,481 96 6,680 Total TDRs 107 $ 87,423 150 $ 21,977 192 $ 55,691 (1) Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs due to restructurings was not significant. (2) Other includes covenant modifications, forbearance, discharges under Chapter 7 bankruptcy, or other concessions.

Transfers of Financial Assets

Transfers of Financial Assets	12 Months Ended
	Dec. 31, 2022
Transfers and Servicing [Abstract]
Transfers of Financial Assets	Transfers and Servicing of Financial Assets The Company originates and sells residential mortgage loans in the normal course of business, primarily to Mortgage banking activities The following table summarizes information related to mortgage banking activities: Years ended December 31, (In thousands) 2022 2021 2020 Net gain on sale $ 580 $ 5,192 $ 15,305 Origination fees 219 1,440 3,230 Fair value adjustments (94) (413) (240) Mortgage banking activities $ 705 $ 6,219 $ 18,295 Proceeds from sale $ 36,335 $ 247,634 $ 486,341 Loans sold with servicing rights retained 32,056 237,834 464,736 Under certain circumstances, the Company may decide to sell loans that were not originated or otherwise acquired with the intent to sell. During the years ended December 31, 2022, 2021, and 2020, the Company sold loans not originated for sale for proceeds of $679.7 million, $82.2 million, and $9.2 million, respectively, which resulted in net gains on sale of $3.3 million, $3.9 million, and $0.3 million, respectively. In addition, the Company may retain servicing rights on its residential mortgage loans sold in the normal course of business. At both December 31, 2022, and 2021, the aggregate principal balance of residential mortgage loans serviced for others totaled $2.0 billion. Mortgage servicing rights are held at the lower of cost, net of accumulated amortization, or fair market value, and are included in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. The Company assesses mortgage servicing rights for impairment each quarter and establishes or adjusts the valuation allowance to the extent that amortized cost exceeds the estimated fair market value. The following table presents the change in the carrying amount for mortgage servicing rights: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 9,237 $ 13,422 $ 17,484 Acquired from Sterling 859 — — Additions 289 2,053 4,373 Amortization (1) (870) (5,593) (6,562) Adjustment to valuation allowance — (645) (1,873) Balance, end of period $ 9,515 $ 9,237 $ 13,422 (1) During the year ended December 31, 2022, the Company implemented a change in the method of amortization applied to its mortgage servicing rights to better reflect the pattern of consumption, where estimated future cash flows are now assessed at the individual loan level as opposed to on a pooled basis. Loan servicing fees, net of mortgage servicing rights amortization, were $5.9 million, $1.7 million, and $1.5 million for the years ended December 31, 2022, 2021, and 2020, respectively, and are included in Loan and lease related fees on the accompanying Consolidated Statements of Income. Information regarding loans held for sale and mortgage servicing rights can be found within Note 18: Fair Value Measurements.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment The following table summarizes the components of premises and equipment: At December 31, (In thousands) 2022 2021 Land $ 73,916 $ 9,436 Buildings and improvements 106,180 67,501 Leasehold improvements 84,477 65,606 Furniture, fixtures, and equipment 71,542 64,890 Data processing equipment and software 128,153 105,516 Property and equipment 464,268 312,949 Less: Accumulated depreciation and amortization (225,152) (228,318) Property and equipment, net 239,116 84,631 ROU lease assets, net 191,068 119,926 Premises and equipment, net $ 430,184 $ 204,557 Depreciation and amortization of property and equipment was $41.7 million, $31.4 million, and $32.5 million for the During the year ended December 31, 2022, the Company launched and completed a corporate real estate consolidation strategy in which the Company closed 14 locations in order to reduce its corporate real estate facility square footage by approximately 45%. In connection with this corporate real estate consolidation plan, the Company had arranged to sell its New Britain, Connecticut facility, which is comprised of land, buildings, and improvements, within the next twelve months. This resulted in a $1.8 million write-down to the fair market value of the property and the subsequent transfer of the property to assets held for disposition. The sale of the New Britain property is expected to close during the second quarter of 2023. The Company also recorded a $6.3 million loss on disposals of property and equipment during the year ended The following table summarizes the activity in assets held for disposition: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 490 $ 2,654 $ — Transfers from (to) property and equipment 4,800 (38) 2,654 Write-downs (190) — — Sales (300) (2,126) — Balance, end of period $ 4,800 $ 490 $ 2,654 Assets held for disposition are included in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets.

Leasing

Leasing	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Leasing	Leasing Lessor Arrangements The Company leases certain types of machinery and equipment to its customers through sales-type and direct financing leases as part of its equipment financing portfolio. These leases generally have remaining lease terms of six months to ten years, some of which include renewal options and/or options for the lessee to purchase the lease near or at the end of the least term. The Company recognized interest income from its sales-type and direct financing lessor activities of $15.4 million, $7.5 million, and $7.1 million for the years ended December 31, 2022, 2021, and 2020, respectively. The Company does not have any significant operating leases in which it is the lessor. Additional information regarding the Company's equipment financing portfolio can be found within Note 4: Loans and Leases. The following table summarizes the components of the Company's net investment in its sales-type and direct financing leases: At December 31, (In thousands) 2022 2021 Lease receivables $ 330,690 $ 196,632 Unguaranteed residual values 100,368 19,748 Total net investment $ 431,058 $ 216,380 The following table reconciles undiscounted future lease payments to the total sales-type and direct financing leases' net investment: (In thousands) At December 31, 2022 2023 $ 146,858 2024 91,592 2025 74,522 2026 71,950 2027 27,029 Thereafter 56,598 Total lease payments receivable 468,549 Present value adjustment (37,491) Total net investment $ 431,058 Lessee Arrangements The Company enters into operating leases in the normal course of business, primarily for office space, banking centers, and other operational activities. These leases generally have remaining lease terms of one The following table summarizes the Company's ROU lease assets and operating lease liabilities: At December 31, (In thousands) Consolidated Balance Sheet Line Item 2022 2021 ROU lease assets Premises and equipment, net $ 191,068 $ 119,926 Operating lease liabilities Accrued expenses and other liabilities 239,281 144,804 ROU lease asset impairment charges totaled $23.1 million, $1.2 million, and $12.0 million for the years ended The following table summarizes the components of operating lease expense and other relevant information: At or for the Years ended December 31, (In thousands) 2022 2021 2020 Lease Cost: Operating and variable lease costs $ 44,654 $ 30,936 $ 35,916 Sublease income (1,383) (554) (557) Total operating lease expense $ 43,271 $ 30,382 $ 35,359 Other Information: Cash paid for amounts included in the measurement of operating lease liabilities $ 44,767 $ 30,487 $ 31,212 ROU lease assets obtained in exchange for operating lease liabilities (1) 27,897 15,226 9,211 Weighted-average remaining lease term (in years) 7.72 7.50 8.04 Weighted-average discount rate 2.65 % 3.04 % 3.19 % (1) Excludes ROU lease assets acquired from Sterling in the merger. The following table reconciles undiscounted future lease payments to total operating lease liabilities: (In thousands) At December 31, 2022 2023 $ 40,614 2024 40,808 2025 36,274 2026 32,696 2027 27,201 Thereafter 91,369 Total operating lease payments 268,962 Present value adjustment (29,681) Total operating lease liabilities $ 239,281

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill The following table summarizes changes in the carrying amount of goodwill: At December 31, (In thousands) 2022 2021 Balance, beginning of period $ 538,373 $ 538,373 Sterling merger 1,939,765 — Bend acquisition 35,966 — Balance, end of period $ 2,514,104 $ 538,373 Information regarding goodwill by reportable segment can be found within Note 21: Segment Reporting. Other Intangible Assets The following table summarizes other intangible assets: At December 31, 2022 2021 (In thousands) Gross Carrying Amount (1) Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposits $ 146,037 $ 36,710 $ 109,327 $ 26,625 $ 18,516 $ 8,109 Customer relationships 115,000 24,985 90,015 21,000 11,240 9,760 Other intangible assets $ 261,037 $ 61,695 $ 199,342 $ 47,625 $ 29,756 $ 17,869 (1) The increase in the gross carrying amount of other intangible assets is primarily attributed to the merger with Sterling and acquisition of Bend, in which the Company recorded a combined $119.1 million in core deposits and $94.0 million of customer relationships. These other intangible assets are being amortized on an accelerated basis over a period of 10 years. The remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) At December 31, 2023 $ 30,362 2024 24,481 2025 21,487 2026 21,487 2027 21,487 Thereafter 80,038

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense reflects the following expense (benefit) components: Years ended December 31, (In thousands) 2022 2021 2020 Current: Federal $ 170,779 $ 109,621 $ 73,172 State and local 52,579 20,374 17,417 Total current 223,358 129,995 90,589 Deferred: Federal (45,421) (9,844) (23,799) State and local (24,243) 4,846 (7,437) Total deferred (69,664) (4,998) (31,236) Total federal 125,358 99,777 49,373 Total state and local 28,336 25,220 9,980 Income tax expense $ 153,694 $ 124,997 $ 59,353 Included in the Company's income tax expense for the years ended December 31, 2022, 2021, and 2020, are net tax credits of approximately $14.0 million, $2.6 million, and $1.1 million, respectively. These amounts relate primarily to LIHTC investments and include associated SALT credits and benefits, with the increase in 2022 primarily attributable to Webster's merger with Sterling. Also included in the Company's income tax expense for the years ended December 31, 2022, and 2021, are benefits from operating loss carryforward of $10.3 million and $0.4 million, respectively. The 2022 amount includes a $9.9 million benefit related to a reduction in the Company's beginning-of-year valuation allowance for its SALT DTAs. The deferred federal benefit in 2021 reflects the effects of elections the Company made on its 2020 federal tax return to defer cost recovery deductions, which did not impact deferred state and local expense to any significant degree. The following table reflects a reconciliation of reported income tax expense to the amount that would result from applying the federal statutory rate of 21.0%: Years ended December 31, 2022 2021 2020 (In thousands) Amount Percent Amount Percent Amount Percent Income tax expense at federal statutory rate $ 167,575 21.0 % $ 112,111 21.0 % $ 58,795 21.0 % Reconciliation to reported income tax expense: SALT expense, net of federal 32,259 4.1 19,924 3.7 7,884 2.8 Tax-exempt interest income, net (35,371) (4.4) (6,814) (1.3) (7,181) (2.6) Increase in cash surrender value of life insurance (6,122) (0.8) (3,030) (0.6) (3,058) (1.1) Non-deductible FDIC Deposit insurance premiums 5,581 0.7 2,064 0.4 2,172 0.8 Low income housing tax credits and other benefits, net (7,627) (1.0) (615) (0.1) (289) (0.1) Non-deductible compensation expense 7,948 1.0 786 0.1 454 0.2 Non-deductible merger-related expenses, excluding compensation 2,717 0.3 3,451 0.7 — — SALT DTA valuation allowance adjustment, net (9,874) (1.2) — — — — Other, net (3,392) (0.4) (2,880) (0.5) 576 0.2 Income tax expense and effective tax rate $ 153,694 19.3 % $ 124,997 23.4 % $ 59,353 21.2 % The following table reflects the significant components of the DTAs, net: At December 31, (In thousands) 2022 2021 Deferred tax assets: ACL on loans and leases $ 161,932 $ 78,905 Net operating loss and credit carry forwards 72,035 64,366 Compensation and employee benefit plans 55,093 22,840 Lease liabilities under operating leases 64,899 38,130 Net unrealized loss on AFS securities 233,978 — Other 38,314 12,790 Gross deferred tax assets 626,251 217,031 Valuation allowance (29,176) (37,374) Total deferred tax assets, net of valuation allowance $ 597,075 $ 179,657 Deferred tax liabilities: Net unrealized gain on AFS securities $ — $ 1,885 ROU assets under operating leases 51,822 31,580 Equipment financing leases 74,295 21,193 Goodwill and other intangible assets 56,223 5,690 Purchase accounting and fair value adjustments 11,529 — Other 31,572 9,904 Gross deferred tax liabilities 225,441 70,252 Deferred tax assets, net $ 371,634 $ 109,405 The Company's DTAs, net increased by $262.2 million during 2022, primarily reflecting the $69.7 million deferred tax benefit and a $245.9 million benefit allocated directly to AOCI, partially offset by a $51.9 million deferred tax liability, net, established in purchase accounting related to the merger with Sterling and acquisition of Bend. The valuation allowance of $29.2 million at December 31, 2022, consists of approximately $28.6 million attributable to SALT net operating loss carryforwards and $0.6 million of federal credit carryforwards, as compared to $37.4 million at SALT net operating loss carryforwards approximated $1.0 billion at December 31, 2022, including those related to the Sterling merger and Bend acquisition, and are scheduled to expire in varying amounts during tax years 2024 through 2032. Federal net operating loss carryforwards of approximately $21.9 million and credit carryforwards of $0.6 million at December 31, 2022, related to the Bend acquisition are subject to annual limitations on utilization, with the net operating losses able to be carried forward indefinitely and the credits scheduled to expire in varying amounts between 2038 and 2041. The valuation allowance has been established for approximately $484.4 million of those SALT net operating loss carryforwards and the $0.6 million of federal credit carryforwards that are estimated to expire unused. Management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize its total DTAs, net of the valuation allowance. Although taxable income in prior years is no longer able to be included as a source of taxable income, due to the general repeal of the carryback of net operating losses under the Tax Cuts and Jobs Act of 2017, significant positive evidence remains in support of management's conclusion regarding the realizability of the Company's DTAs, including projected future reversals of existing taxable temporary differences and book-taxable income levels in recent and projected in future years. There can, however, be no assurance that any specific level of future income will be generated or that the Company’s DTAs will ultimately be realized. DTLs of $63.2 million and $15.3 million at December 31, 2022, and 2021, respectively, have not been recognized for certain thrift bad-debt reserves, established before 1988, that would become taxable upon the occurrence of certain events: distributions by the Bank in excess of certain earnings and profits; the redemption of the Bank’s stock; or liquidation. The Company does not expect any of those events to occur. At December 31, 2022, and 2021, the cumulative taxable temporary differences applicable to those reserves approximated $233.1 million and $58.0 million, respectively, with the increase in 2022 attributable to the merger with Sterling. The following table reflects a reconciliation of the beginning and ending balances of UTBs: Years ended December 31, (In thousands) 2022 2021 2020 Beginning balance $ 4,249 $ 4,252 $ 4,813 Additions as a result of tax positions taken during the current year 223 294 87 Additions as a result of tax positions taken during prior years 8,807 434 572 Reductions as a result of tax positions taken during prior years (503) (186) (694) Reductions relating to settlements with taxing authorities (2,110) (267) (130) Reductions as a result of lapse of statute of limitation periods (791) (278) (396) Ending balance $ 9,875 $ 4,249 $ 4,252 The increase in additions as a result of tax positions taken during prior years reflects the merger with Sterling. At The Company recognizes interest and penalties related to UTBs, where applicable, in income tax expense. The Company recognized an expense of $0.1 million and $0.3 million during the years ended December 31, 2022, and 2021, respectively, and a benefit of $0.1 million for the year ended December 31, 2020. At December 31, 2022 and 2021, the Company had accrued interest and penalties related to UTBs of $2.0 million and $1.9 million respectively. The Company has determined it is reasonably possible that its total UTBs could decrease by between $0.7 million and $6.8 million by the end of 2023 as a result of potential lapses in statute-of-limitation periods and/or potential settlements with taxing authorities, primarily concerning various depreciation and state and local apportionment and tax-base determinations. The Company's federal tax returns for all years subsequent to 2018 remain open to examination, including the carryback of a Sterling 2019 net operating loss under the CARES Act in 2020 to tax years 2014 and 2016, currently under review by the Internal Revenue Service. The Company's tax returns filed in its principal state tax jurisdictions of Connecticut, Massachusetts, New York, and Rhode Island for years subsequent to 2014, or 2018, are either under or remain open to examination.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2022
Deposit Liabilities [Abstract]
Deposits	Deposits The following table summarizes deposits by type: At December 31, (In thousands) 2022 2021 Non-interest-bearing: Demand $ 12,974,975 $ 7,060,488 Interest-bearing: Health savings accounts 7,944,892 7,397,582 Checking 9,237,529 4,182,497 Money market 11,062,652 3,718,953 Savings 8,673,343 5,689,739 Time deposits 4,160,949 1,797,770 Total interest-bearing 41,079,365 22,786,541 Total deposits $ 54,054,340 $ 29,847,029 Time deposits, money market, and interest-bearing checking obtained through brokers $ 1,964,873 $ 120,392 Aggregate amount of time deposit accounts that exceeded the FDIC limit 1,894,950 256,522 Demand deposit overdrafts reclassified as loan balances 8,721 1,577 The following table summarizes the scheduled maturities of time deposits: (In thousands) At December 31, 2022 2023 $ 3,754,386 2024 181,790 2025 129,775 2026 55,102 2027 39,896 Thereafter — Total time deposits $ 4,160,949

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table summarizes securities sold under agreements to repurchase and other borrowings: At December 31, 2022 2021 (In thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) : Original maturity of one year or less $ 282,005 0.11 % $ 474,896 0.11 % Original maturity of greater than one year, non-callable (2) — — 200,000 1.32 Total securities sold under agreements to repurchase (1) 282,005 0.11 674,896 0.47 Federal funds purchased 869,825 4.44 — — Securities sold under agreements to repurchase and other borrowings $ 1,151,830 3.38 % $ 674,896 0.47 % (1) The Company has the 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. (2) During the year ended December 31, 2022, the Company and its repurchase agreement counterparty agreed to fully extinguish Securities sold under agreements to repurchase are used as a source of borrowed funds and are collateralized by Agency MBS and Corporate debt. The Company's repurchase agreement counterparties are limited to primary dealers in government securities, and commercial and municipal customers through the Corporate Treasury function. The Company may also purchase unsecured term and overnight federal funds to satisfy its short-term liquidity needs. The following table summarizes information for FHLB advances: At December 31, 2022 2021 (In thousands) Total Weighted-Average Contractual Coupon Rate Total Weighted-Average Contractual Coupon Rate Maturing within 1 year $ 5,450,187 4.40 % $ 90 — % After 1 but within 2 years — — 202 2.95 After 2 but within 3 years — — — — After 3 but within 4 years — — — — After 4 but within 5 years 252 — — — After 5 years 10,113 2.09 10,705 2.03 FHLB advances $ 5,460,552 4.39 % $ 10,997 2.03 % Aggregate carrying value of assets pledged as collateral $ 13,692,379 $ 7,556,034 Remaining borrowing capacity at FHLB 4,291,326 5,087,294 The Bank may borrow up to the amount of eligible mortgages and securities that have been pledged as collateral to secure FHLB advances, which includes certain residential and commercial real estate loans, home equity lines of credit, MBS and Agency CLO. The Bank was in compliance with its FHLB collateral requirements at both December 31, 2022, and 2021. The following table summarizes long-term debt: At December 31, (In thousands) 2022 2021 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) 333,458 338,811 4.000% Subordinated fixed-to-floating rate notes due December 30, 2029 274,000 — 3.875 % Subordinated fixed-to-floating rate notes due November 1, 2030 225,000 — Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total senior and subordinated debt 1,059,778 566,131 Discount on senior fixed-rate notes (756) (974) Debt issuance cost on senior fixed-rate notes (1,824) (2,226) Premium on subordinated fixed-to-floating rate notes 15,930 — Long-term debt $ 1,073,128 $ 562,931 (1) The Company de-designated its fair value hedging relationship on these senior notes in 2020. A basis adjustment of $33.5 million and $38.8 million at December 31, 2022, and 2021, respectively, is included in the carrying value and is being amortized over the remaining life of the senior notes. (2) The interest rate on the Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 7.69% and 3.17% at December 31, 2022, and 2021, respectively. The Company assumed $274.0 million in aggregate principal amount of 4.00% fixed-to-floating rate subordinated notes due on December 30, 2029 (the 2029 subordinated notes), in connection with the Sterling merger. The 2029 subordinated notes were issued by Sterling on December 16, 2019, through a public offering, and are redeemable at a price equal to the total principal amount plus any accrued and unpaid interest thereon, in whole or in part by the Company on December 30, 2024, or any interest payment date thereafter, upon the occurrence of certain specified events. Until December 30, 2024, the interest rate is fixed at 4.00% and payable semi-annually in arrears on each June 30 and December 30. From and including The Company also assumed $225.0 million in aggregate principal amount of 3.875% fixed-to-floating rate subordinated notes due on November 1, 2030 (the 2030 subordinated notes), in connection with the Sterling merger. The 2030 subordinated notes were issued by Sterling on October 30, 2020, through a public offering, and are redeemable at a price equal to the total principal amount plus any accrued and unpaid interest thereon, in whole or in part by the Company on November 1, 2025, or any interest payment date thereafter, upon the occurrence of certain specified events. Until November 1, 2025, the interest rate is fixed at 3.875% and payable semi-annually in arrears on each May 1 and November 1. From and including November 1, 2025, through the earlier of maturity or redemption, the 2030 subordinated notes will bear interest at a floating rate per annum equal to The Company recorded the 2029 and 2030 subordinated notes at their estimated fair value of $281.0 million and $235.9 million, respectively, on January 31, 2022. The corresponding purchase premiums are being amortized into interest expense over the remaining lives of the subordinated notes.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity The following table summarizes the changes in shares of preferred and common stock issued and common stock held as treasury shares for the year ended December 31, 2022: Preferred Stock Series F Issued Preferred Stock Series G Issued Common Stock Issued (1) Treasury Stock Held Common Stock Outstanding Balance, beginning of period 6,000 — 93,686,311 3,102,690 90,583,621 Issued in business combination — 135,000 89,091,734 — 89,091,734 Contribution to charitable foundation — — — (242,270) 242,270 Employee stock compensation plan activity — — — (458,881) 458,881 Stock options exercised — — — (30,355) 30,355 Common stock repurchase program — — 6,399,288 (6,399,288) Balance, end of period 6,000 135,000 182,778,045 8,770,472 174,007,573 (1) In accordance with the merger agreement, 87,965,239 shares were issued as consideration for outstanding Sterling common stock, and 1,126,495 shares were issued to replace Sterling equity awards. Additional information regarding the determination of the purchase price consideration for the Sterling merger can be found within Note 2: Mergers and Acquisitions. Repurchases of Common Stock The Company maintains a common stock repurchase program, which was approved by the Board of Directors on In addition, the Company will periodically acquire Webster common stock outside of the repurchase program related to employee stock compensation plan activity. During the year ended December 31, 2022, the Company repurchased shares at a weighted-average price of $56.90 per share, totaling $23.6 million for this purpose. Contribution to Charitable Foundation On July 8, 2022, the Company made an unrestricted and unconditional contribution of Webster common shares to the Webster Bank Charitable Foundation, a nonprofit charitable organization with a focus on education and community development that serves communities in the Greater New York City, Lower Hudson Valley, Long Island, and New Jersey areas. The fair value of these shares based on their closing price on the contribution date was $10.5 million. Change in Common Shares Authorized The number of authorized shares of Webster common stock was increased from 200.0 million shares to 400.0 million shares on January 31, 2022, in connection with the completion of the merger with Sterling and in accordance with the merger agreement. Series F Preferred Stock On December 12, 2017, the Company closed on a public offering of 6,000,000 depositary shares, each representing 1/1000th ownership interest in a share of 5.25% Series F Non-Cumulative Preferred Perpetual Stock, par value $0.01 per share, with a liquidation preference equal to $25,000 per share (the Series F Preferred Stock). Dividends on the Series F Preferred Stock are non-cumulative and are not mandatory. If declared by the Board of Directors, or a duly authorized committee thereof, the Company will pay dividends quarterly in arrears on the fifteenth day of each March, June, September, and December, at a rate equal to 5.25% of the $25,000 per share liquidation amount per annum. If a dividend on the Series F Preferred Stock is not declared in respect of a dividend period, a dividend will not accrue and the Company has no obligation to pay any dividend for that period, regardless as to whether a dividend is declared for a future period on the Series F Preferred Stock or any other series of Webster preferred stock. The terms of the Series F Preferred Stock prohibit the Company from declaring or paying any cash dividends on Webster common stock, and from repurchasing, redeeming, or otherwise acquiring Webster common stock or any other series of Webster preferred stock to which it ranks on parity with, unless dividends have been declared and paid in full on the Series F Preferred Stock for the most recent dividend period. The Series F Preferred Stock is perpetual and has no maturity date, and is not subject to any mandatory redemption, sinking fund, or other similar provisions. Except with respect to certain non-payment events and certain changes to the terms of the Series F Preferred Stock, holders have no voting rights nor preemptive or conversion rights. The Series F Preferred Stock is not convertible or exchangeable for shares of any other class of Webster stock. Series G Preferred Stock On January 31, 2022, in connection with the Sterling merger, the Company registered and issued 5,400,000 depositary shares, each representing 1/40th interest in a share of 6.50% Series G Non-Cumulative Preferred Perpetual Stock, par value $0.01 per share, with a liquidation preference equal to $1,000 per share (the Series G Preferred Stock). The Series G Preferred Stock ranks on parity with the Series F Preferred Stock and senior to Webster common stock, with respect to the payment of dividends and distributions upon the liquidation, dissolution, or winding-up of the Company. Dividends on the Series G Preferred Stock are non-cumulative and are not mandatory. If declared by the Board of Directors, or a duly authorized committee thereof, the Company will pay dividends quarterly in arrears on the fifteenth day of each The Series G Preferred Stock is perpetual and has no maturity date, and is not subject to any mandatory redemption, sinking fund, or other similar provisions. Except with respect to certain non-payment events and certain changes to the terms of the Series G Preferred Stock, holders have no voting rights, nor preemptive or conversion rights. The Series G Preferred Stock is not convertible or exchangeable for shares of any other class of Webster stock. Preferred Stock Redemptions The Company may redeem either the Series F Preferred Stock or the Series G Preferred Stock at its option, in whole or in part, subject to the approval of Federal Reserve Board, on any dividend payment date, or in whole but not in part, upon the occurrence of a regulatory capital treatment event, at a redemption price equal to the liquidation preference plus any declared and unpaid dividends, without accumulation of any undeclared dividends. The Company has no plans to redeem either its Series F Preferred Stock or its Series G Preferred stock, in whole or in part, as of the date of this Annual Report on Form 10-K.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net of Tax	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Accumulated Other Comprehensive Loss, Net of Tax	Accumulated Other Comprehensive (Loss) Income, Net of Tax The following table summarizes the changes in each component of accumulated other comprehensive (loss) income, net of tax: (In thousands) Investment Securities Available- Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance at December 31, 2019 $ 17,251 $ (9,184) $ (44,139) $ (36,072) Other comprehensive income (loss) before reclassifications 50,179 20,667 (3,887) 66,959 Amounts reclassified from accumulated other comprehensive (6) 8,435 2,940 11,369 Other comprehensive income (loss), net of tax 50,173 29,102 (947) 78,328 Balance at December 31, 2020 67,424 19,918 (45,086) 42,256 Other comprehensive (loss) income before reclassifications (62,888) (17,109) 8,876 (71,121) Amounts reclassified from accumulated other comprehensive — 3,261 3,024 6,285 Other comprehensive (loss) income, net of tax (62,888) (13,848) 11,900 (64,836) Balance at December 31, 2021 4,536 6,070 (33,186) (22,580) Other comprehensive (loss) before reclassifications (640,656) (17,810) (13,350) (671,816) Amounts reclassified from accumulated other comprehensive 4,960 2,866 1,610 9,436 Other comprehensive (loss), net of tax (635,696) (14,944) (11,740) (662,380) Balance at December 31, 2022 $ (631,160) $ (8,874) $ (44,926) $ (684,960) The following table further summarizes the amounts reclassified from accumulated other comprehensive (loss) income: Years ended December 31, Accumulated Other Comprehensive Income (Loss) Components 2022 2021 2020 Associated Line Item in the Consolidated Statement Of Income (In thousands) Investment securities available-for-sale: Net unrealized holding (losses) gains $ (6,751) $ — $ 8 (Loss) gain on sale of investment securities, net Tax benefit (expense) 1,791 — (2) Income tax expense Net of tax $ (4,960) $ — $ 6 Derivative instruments: Hedge terminations $ (306) $ (306) $ (7,884) Interest expense Premium amortization (3,626) (4,109) (3,536) Interest income Tax benefit 1,066 1,154 2,985 Income tax expense Net of tax $ (2,866) $ (3,261) $ (8,435) Defined benefit pension and other postretirement benefit plans: Actuarial net loss amortization $ (2,210) $ (4,102) $ (3,976) Other non-interest expense Tax benefit 600 1,078 1,036 Income tax expense Net of tax $ (1,610) $ (3,024) $ (2,940) The following tables summarize each component of other comprehensive (loss) income and the related tax effects: Year ended December 31, 2022 (In thousands) Amount Tax Benefit (Expense) Amount Investment securities available-for-sale: Net unrealized holding (losses) arising during the year $ (878,366) $ 237,710 $ (640,656) Reclassification adjustment for net realized losses included in net income 6,751 (1,791) 4,960 Total investment securities available-for-sale (871,615) 235,919 (635,696) Derivative instruments: Net unrealized (losses) arising during the year (24,440) 6,630 (17,810) Reclassification adjustment for net realized losses included in net income 3,932 (1,066) 2,866 Total derivative instruments (20,508) 5,564 (14,944) Defined benefit pension and other postretirement benefit plans: Net actuarial (loss) arising during the year (18,319) 4,969 (13,350) Reclassification adjustment for net actuarial loss amortization included in net income 2,210 (600) 1,610 Total defined benefit pension and postretirement benefit plans (16,109) 4,369 (11,740) Other comprehensive (loss), net of tax $ (908,232) $ 245,852 $ (662,380) Year ended December 31, 2021 (In thousands) Amount Tax Benefit (Expense) Amount Investment securities available-for-sale: Net unrealized holding (losses) arising during the year $ (85,368) $ 22,480 $ (62,888) Total investment securities available-for-sale (85,368) 22,480 (62,888) Derivative instruments: Net unrealized (losses) arising during the year (23,216) 6,107 (17,109) Reclassification adjustment for net realized losses included in net income 4,415 (1,154) 3,261 Total derivative instruments (18,801) 4,953 (13,848) Defined benefit pension and other postretirement benefit plans: Net actuarial gain arising during the year 12,052 (3,176) 8,876 Reclassification adjustment for net actuarial loss amortization included in net income 4,102 (1,078) 3,024 Total defined benefit pension and postretirement benefit plans 16,154 (4,254) 11,900 Other comprehensive (loss), net of tax $ (88,015) $ 23,179 $ (64,836) Year ended December 31, 2020 (In thousands) Amount Tax Benefit (Expense) Amount Investment securities available-for-sale: Net unrealized holding gains arising during the year $ 68,116 $ (17,937) $ 50,179 Reclassification adjustment for net realized gains included in net income (8) 2 (6) Total investment securities available-for-sale 68,108 (17,935) 50,173 Derivative instruments: Net unrealized gains arising during the year 27,683 (7,016) 20,667 Reclassification adjustment for net realized losses included in net income 11,420 (2,985) 8,435 Total derivative instruments 39,103 (10,001) 29,102 Defined benefit pension and other postretirement benefit plans: Net actuarial (loss) arising during the year (5,262) 1,375 (3,887) Reclassification adjustment for net actuarial loss amortization included in net income 3,976 (1,036) 2,940 Total defined benefit pension and postretirement benefit plans (1,286) 339 (947) Other comprehensive income, net of tax $ 105,925 $ (27,597) $ 78,328

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Matters	Regulatory Capital and Restrictions Capital Requirements The Holding Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory actions by regulators that could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and/or the regulatory framework for prompt corrective action (such provisions apply to the Bank only), both the Holding Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated pursuant to regulatory directives. Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by the Basel III Capital Rules to ensure capital adequacy require the Company to maintain minimum ratios of CET1 capital to total risk-weighted assets (CET1 risk-based capital), Tier 1 capital to total risk-weighted assets (Tier 1 risk-based capital), Total capital to total risk-weighted assets (Total risk-based capital), and Tier 1 capital to average tangible assets (Tier 1 leverage capital), as defined in the regulations. CET1 capital consists of common stockholders’ equity less deductions for goodwill and other intangible assets, and certain deferred tax adjustments. Upon adoption of the Basel III Capital Rules, the Company elected to opt-out of the requirement to include certain components of AOCI in CET1 capital. Tier 1 capital consists of CET1 capital plus preferred stock. Total capital consists of Tier 1 capital and Tier 2 capital, as defined in the regulations. Tier 2 capital includes permissible portions of subordinated debt and the ACL. At December 31, 2022, and 2021, both the Company and the Bank were classified as well-capitalized. Management believes that no events or changes have occurred subsequent to year-end that would change this designation. The following table provides information on the regulatory capital ratios for the Holding Company and the Bank: At December 31, 2022 Actual (1) Minimum Requirement Well Capitalized (In thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 5,822,369 10.71 % $ 2,446,344 4.5 % $ 3,533,608 6.5 % Total risk-based capital 7,203,029 13.25 4,349,056 8.0 5,436,320 10.0 Tier 1 risk-based capital 6,106,348 11.23 3,261,792 6.0 4,349,056 8.0 Tier 1 leverage capital 6,106,348 8.95 2,730,212 4.0 3,412,765 5.0 Webster Bank CET1 risk-based capital $ 6,661,504 12.28 % $ 2,442,058 4.5 % $ 3,527,417 6.5 % Total risk-based capital 7,165,935 13.20 4,341,437 8.0 5,426,796 10.0 Tier 1 risk-based capital 6,661,504 12.28 3,256,078 6.0 4,341,437 8.0 Tier 1 leverage capital 6,661,504 9.77 2,727,476 4.0 3,409,345 5.0 At December 31, 2021 Actual (1) Minimum Requirement Well Capitalized (In thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,804,290 11.72 % $ 1,076,871 4.5 % $ 1,555,480 6.5 % Total risk-based capital 3,265,064 13.64 1,914,436 8.0 2,393,046 10.0 Tier 1 risk-based capital 2,949,327 12.32 1,435,827 6.0 1,914,436 8.0 Tier 1 leverage capital 2,949,327 8.47 1,393,607 4.0 1,742,008 5.0 Webster Bank CET1 risk-based capital $ 3,034,883 12.69 % $ 1,075,920 4.5 % $ 1,554,107 6.5 % Total risk-based capital 3,273,300 13.69 1,912,747 8.0 2,390,934 10.0 Tier 1 risk-based capital 3,034,883 12.69 1,434,560 6.0 1,912,747 8.0 Tier 1 leverage capital 3,034,883 8.72 1,392,821 4.0 1,741,026 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, which ended on January 1, 2022, and a subsequent three-year transition period ending on December 31, 2024. Therefore, the December, 31, 2021 regulatory capital ratios and amounts exclude the impact of the increased ACL on loans and leases, HTM investment securities, and unfunded loan commitments attributed to the adoption of CECL on January 1, 2020, 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. During the three year transition period, regulatory capital ratios will begin to phase out the aggregate amount of the regulatory capital benefit provided in the initial two years. For 2022, 2023, and 2024, the Company is allowed 75%, 50%, and 25% of the regulatory capital benefit as of December 31, 2021, respectively, with full absorption occurring in 2025. Dividend Restrictions The Holding Company is dependent upon dividends from the Bank to provide funds for the payment of dividends to stockholders and for other cash requirements. 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 if the amount would exceed net income for that year combined with undistributed net income for the preceding two years. The Bank paid the Holding Company $475.0 million and $200.0 million in dividends during the years ended December 31, 2022, and 2021, respectively, for which no express approval from the OCC was required. Cash Restrictions

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following table summarizes the calculation of basic and diluted earnings per common share: Years ended December 31, (In thousands, except per share data) 2022 2021 2020 Net income $ 644,283 $ 408,864 $ 220,621 Less: Preferred stock dividends 15,919 7,875 7,875 Net income available to common stockholders 628,364 400,989 212,746 Less: Earnings allocated to participating securities 5,672 2,302 1,272 Earnings applicable to common stockholders $ 622,692 $ 398,687 $ 211,474 Weighted-average common shares outstanding - basic 167,452 89,983 89,967 Add: Effect of dilutive stock options and restricted stock 95 223 184 Weighted-average common shares outstanding - diluted 167,547 90,206 90,151 Basic earnings per common share $ 3.72 $ 4.43 $ 2.35 Diluted earnings per common share 3.72 4.42 2.35 Earnings per common share is calculated under the two-class method in which all earnings (distributed and undistributed) are allocated to common stock and participating securities based on their respective rights to receive dividends. The Company may grant restricted stock, restricted stock units, non-qualified stock options, incentive stock options, or stock appreciation rights to certain employees and directors under its stock-based compensation programs, which entitle recipients to receive

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as 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. The determination of fair value may require the use of estimates when quoted market prices are not available. Fair value estimates made at a specific point in time are based on management’s judgments regarding future expected losses, current economic conditions, the risk characteristics of each financial instrument, and other subjective factors that cannot be determined with precision. The framework for measuring fair value provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The three levels within the fair value hierarchy are as follows: • Level 1: Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access at the measurement date. • Level 2: Inputs to the valuation methodology include 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 (i.e., interest rates, rate volatility, prepayment speeds, and credit ratings), or inputs that are derived principally from or corroborated by market data, correlation or other means. • Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. This includes certain pricing models or other similar techniques that require significant management judgment or estimation. Assets and Liabilities Measured at Fair Value on a Recurring Basis AFS Investment Securities. When unadjusted quoted prices are available in an active market, the Company classifies its AFS investment securities within Level 1 of the fair value hierarchy. U.S. Treasury notes have a readily determinable fair value, and therefore, 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. These 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 the respective terms and conditions for debt instruments. Management maintains procedures to monitor the pricing service's results and has a process in place to challenge their valuations and methodologies that appear unusual or unexpected. Government agency debentures, Municipal bonds and notes, Agency CMO, Agency MBS, Agency CMBS, CMBS, CLO, Corporate debt, Private label MBS, and Other AFS investment securities are classified within Level 2 of the fair value hierarchy. Derivative Instruments. The fair values presented for derivative instruments include any accrued interest. Foreign exchange contracts are valued based on unadjusted quoted prices in active markets and accordingly are classified within Level 1 of the fair value hierarchy. Except for mortgage banking derivatives, 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 then validated against valuations performed by independent third parties. These derivative instruments are classified within Level 2 of the fair value hierarchy. Mortgage Banking Derivatives. The Company uses forward sales of mortgage loans and mortgage-backed securities to manage the 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 this in-between time period, the Company is subject to the risk that market interest rates may change. If rates rise, investors generally will pay less to purchase mortgage loans, which would result in a reduction in the gain on sale of the loans, or possibly a loss. In an effort to mitigate this risk, forward delivery sales commitments are established in which the Company agrees to either 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. Accordingly, mortgage banking derivatives are classified within Level 2 of the fair value hierarchy. Originated Loans Held For Sale . The Company has elected to measure originated loans held for sale at fair value under the fair value option per ASC Topic 825, Financial Instruments. Electing to measure originated loans held for sale at fair value reduces certain timing differences and better reflects the price the Company would expect to receive from the sale of these loans. The fair value of originated loans held for sale is based on quoted market prices of similar loans sold in conjunction with securitization transactions. Accordingly, originated loans held for sale are classified within Level 2 of the fair value hierarchy. The following table compares the fair value to the unpaid principal balance of originated loans held for sale: At December 31, 2022 2021 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 1,991 $ 1,631 $ 360 $ 4,694 $ 5,034 $ (340) Rabbi Trust Investments. Investments held in each of the Company's Rabbi Trusts consist primarily of mutual funds that invest in equity and fixed income securities. Shares of these mutual funds are valued based on the NAV as reported by the trustee of the funds, which represents quoted prices in active markets. The Company has elected to measure the Rabbi Trusts' investments at fair value. Accordingly, the Rabbi Trusts' investments are classified within Level 1 of the fair value hierarchy. At December 31, 2022, and 2021, the total cost basis of the investments held in the Rabbi Trusts was $10.0 million and $1.6 million, respectively. Alternative Investments. Equity investments have a readily determinable fair value when unadjusted quoted prices are available in an active market for identical assets. Accordingly, these alternative investments are classified within Level 1 of the fair value hierarchy. At December 31, 2022, and 2021, equity investments with a readily determinable fair value had a total carrying amount of $0.4 million and $1.9 million, respectively, with no remaining unfunded commitment. During the year ended December 31, 2022, there were total write-downs in fair value of $1.5 million associated with these alternative investments. Equity investments that do not have a readily determinable fair value may qualify for the NAV practical expedient if they meet certain requirements. The Company's alternative investments measured at NAV consist of investments in non-public entities that cannot be redeemed since investments are distributed as the underlying equity is liquidated. Alternative investments measured at NAV are not classified within the fair value hierarchy. At December 31, 2022, and 2021, these alternative investments had a total carrying amount of $89.2 million and $25.9 million, respectively, and a remaining unfunded commitment of $82.7 million and $14.1 million, respectively. The following table summarizes the fair values of assets and liabilities measured at fair value on a recurring basis: At December 31, 2022 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: AFS investment securities: U.S. Treasury notes $ 717,040 $ — $ — $ 717,040 Government agency debentures — 258,374 — 258,374 Municipal bonds and notes — 1,633,202 — 1,633,202 Agency CMO — 59,965 — 59,965 Agency MBS — 2,158,024 — 2,158,024 Agency CMBS — 1,406,486 — 1,406,486 CMBS — 896,640 — 896,640 CLO — 2,107 — 2,107 Corporate debt — 704,412 — 704,412 Private label MBS — 44,249 — 44,249 Other — 12,198 — 12,198 Total AFS investment securities 717,040 7,175,657 — 7,892,697 Gross derivative instruments, before netting (1) 79 222,827 — 222,906 Originated loans held for sale — 1,991 — 1,991 Investments held in Rabbi Trusts 12,103 — — 12,103 Alternative investments (2) 430 — — 89,678 Total financial assets $ 729,652 $ 7,400,475 $ — $ 8,219,375 Financial Liabilities: Gross derivative instruments, before netting (1) $ 843 $ 413,656 $ — $ 414,499 At December 31, 2021 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: AFS investment securities: U.S. Treasury notes $ 396,966 $ — $ — $ 396,966 Agency CMO — 90,384 — 90,384 Agency MBS — 1,593,403 — 1,593,403 Agency CMBS — 1,232,541 — 1,232,541 CMBS — 886,263 — 886,263 CLO — 21,847 — 21,847 Corporate debt — 13,450 — 13,450 Total AFS investment securities 396,966 3,837,888 — 4,234,854 Gross derivative instruments, before netting (1) 187 158,930 — 159,117 Originated loans held for sale — 4,694 — 4,694 Investments held in Rabbi Trust 3,416 — — 3,416 Alternative investments (2) 1,877 — — 27,732 Total financial assets $ 402,446 $ 4,001,512 $ — $ 4,429,813 Financial Liabilities: Gross derivative instruments, before netting (1) $ 141 $ 21,643 $ — $ 21,784 (1) Additional information regarding the impact of netting derivative assets and derivative liabilities, as well as the impact from offsetting cash collateral paid to the same derivative counterparties, can be found in Note 17: Derivative Financial Instruments. (2) Certain 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 The Company measures certain assets at fair value on a non-recurring basis. The following is a description of valuation methodologies used for assets measured at fair value on a non-recurring basis. Alternative Investments. The measurement alternative has been elected for alternative investments without readily determinable fair values that do not qualify for the NAV practical expedient. The measurement alternative requires investments to be measured at cost minus impairment, if any, plus or minus adjustments resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer. Accordingly, these alternative investments are classified within Level 2 of the fair value hierarchy. At December 31, 2022, and 2021, the total carrying amount of these alternative investments was $42.8 million and $25.8 million, respectively, of which $5.9 million and $5.8 million, respectively, were considered to be measured at fair value. During the year ended December 31, 2022, there were $1.0 million of total net Loans Transferred to Held for Sale. Once a decision has been made to sell loans not previously classified as held for sale, these loans are transferred into the held for sale category and carried at the lower of cost or fair value, less estimated costs to sell. At the time of transfer into held for sale classification, any amount by which cost exceeds fair value is accounted for as a valuation allowance. This activity generally pertains to commercial loans with observable inputs, and therefore, are classified within Level 2 of the fair value hierarchy. However, should these loans include adjustments for changes in loan characteristics based on unobservable inputs, the loans would then be classified within Level 3 of the fair value hierarchy. At Collateral Dependent Loans and Leases. Loans and leases for which repayment is substantially expected to be provided through the operation or sale of collateral are considered collateral dependent, and are valued based on the estimated fair value of the collateral, less estimated costs to sell at the reporting date, using customized discounting criteria. Accordingly, collateral dependent loans and leases are classified within Level 3 of the fair value hierarchy. OREO and Repossessed Assets. OREO and repossessed assets are held at the lower of cost or fair value and are considered to be measured at fair value when recorded below cost. The fair value of OREO is calculated using independent appraisals or internal valuation methods, less estimated selling costs, and may consider available pricing guides, auction results, and price opinions. Certain repossessed assets may also require assumptions about factors that are not observable in an active market when determining fair value. Accordingly, OREO and repossessed assets are classified within Level 3 of the fair value hierarchy. At December 31, 2022, and 2021, the total book value of OREO and repossessed assets was $2.3 million and $2.8 million, respectively. In addition, the amortized cost of consumer loans secured by residential real estate property that are in the process of foreclosure at December 31, 2022, was $10.1 million. Estimated Fair Values of Financial Instruments and Mortgage Servicing Assets The Company is required to disclose the estimated fair values of certain financial instruments and mortgage servicing rights. The following is a description of the valuation methodologies used to estimate fair value for those assets and liabilities. Cash and Cash Equivalents . Given the short time frame to maturity, the carrying amount of cash and cash equivalents, which comprises cash and due from banks and interest-bearing deposits, approximates fair value. Cash and cash equivalents are classified within Level 1 of the fair value hierarchy. HTM Investment Securities . When quoted market prices are not available, the Company employs an independent pricing service that utilizes matrix pricing to calculate fair value. These 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 the respective terms and conditions for debt instruments. Management maintains procedures to monitor the pricing service's results and has a process in place to challenge their valuations and methodologies that appear unusual or unexpected. HTM investment securities, which include Agency CMO, Agency MBS, Agency CMBS, Municipal bonds and notes, and CMBS, are classified within Level 2 of the fair value hierarchy. Loans and Leases, net . Except for collateral dependent loans and leases, the fair value of loans and leases held for investment is estimated using a discounted cash flow methodology, based on future prepayments and market interest rates inclusive of an illiquidity premium for comparable loans and leases. The associated cash flows are then adjusted for associated credit risks and other potential losses, as appropriate. Loans and leases are classified within Level 3 of the fair value hierarchy. Mortgage Servicing Rights . Mortgage servicing rights are initially measured at fair value and subsequently measured using the amortization method. The Company assesses mortgage servicing rights for impairment each quarter and establishes or adjusts the valuation allowance to the extent that amortized cost exceeds the estimated fair market value. Fair value is calculated as the present value of estimated future net servicing income and relies on market based assumptions for loan prepayment speeds, servicing costs, discount rates, and other economic factors. Accordingly, the primary risk inherent in valuing mortgage servicing rights is the impact of fluctuating interest rates on the related servicing revenue stream. Mortgage servicing rights are classified within Level 3 of the fair value hierarchy. Deposit Liabilities . The fair value of deposit liabilities, which comprises demand deposits, interest-bearing checking, savings, health savings, and money market accounts, reflects 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 fixed-maturity certificates of deposit is estimated using rates that are currently offered for deposits with 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 approximates their carrying value. The fair value of securities sold under agreements to repurchase and other borrowings that mature after 90 days is estimated using a discounted cash flow methodology based on current market rates and 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. FHLB and Long-Term Debt . The fair value of FHLB advances and long-term debt is estimated using a discounted cash flow methodology in which discount rates are matched with the time period of the expected cash flows and adjusted for associated credit risks, as appropriate. FHLB advances and long-term debt are classified within Level 2 of the fair value hierarchy. The following table summarizes the carrying amounts, estimated fair values, and classifications within the fair value hierarchy of selected financial instruments and mortgage servicing rights: At December 31, 2022 2021 (In thousands) Carrying Fair Carrying Fair Assets: Level 1 Cash and cash equivalents $ 839,943 $ 839,943 $ 461,570 $ 461,570 Level 2 HTM investment securities 6,564,697 5,761,453 6,198,125 6,280,936 Level 3 Loans and leases, net 49,169,685 47,604,463 21,970,542 21,702,732 Mortgage servicing rights 9,515 27,043 9,237 12,527 Liabilities: Level 2 Deposit liabilities $ 49,893,391 $ 49,893,391 $ 28,049,259 $ 28,049,259 Time deposits 4,160,949 4,091,979 1,797,770 1,794,829 Securities sold under agreements to repurchase and other borrowings 1,151,830 1,151,797 674,896 676,581 FHLB advances 5,460,552 5,459,218 10,997 11,490 Long-term debt (1) 1,073,128 1,001,779 562,931 515,912

Retirement Benefit Plans

Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans Defined Benefit Pension and Postretirement Benefit Plans The Bank had offered a qualified noncontributory defined benefit Pension Plan and a non-qualified SERP to eligible employees and key executives who met certain age and service requirements, both of which were frozen effective December 31, 2007. Only those employees who were hired prior to January 1, 2007, and who became participants of the plans prior to January 1, 2008, have accrued benefits under the plans. The Bank also provides for OPEB to certain retired employees. In connection with the merger with Sterling, on January 31, 2022, the Company assumed the benefit obligations of Sterling's non-qualified SERP and OPEB plans, which includes the Astoria Bank Excess Benefit and Supplemental Benefit Plans, Astoria Bank Directors' Retirement Plan, Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors, Supplemental Executive Retirement Plan of Provident Bank, Supplemental Executive Retirement Plan of Provident Bank - Other, Sterling Bancorp Supplemental Postretirement Life Insurance Plan, Astoria Bank Postretirement Welfare Benefit Plans, and a Split Dollar Life Insurance Arrangement. Each of the plan's measurement dates, including the plans assumed from Sterling in the merger, coincides with the Company's December 31 year end. The following table summarizes the changes in the benefit obligation, fair value of plan assets, and funded status of the defined benefit pension and postretirement benefit plans at December 31: Pension SERP OPEB (In thousands) 2022 2021 2022 2021 2022 2021 Change in benefit obligation: Beginning balance $ 250,263 $ 266,414 $ 1,873 $ 2,046 $ 1,904 $ 1,998 Benefit obligation assumed from Sterling — — 4,517 — 26,030 — Service cost — — — — 34 — Interest cost 5,565 4,663 107 30 652 19 Actuarial (gain) loss (57,751) (11,131) (581) (77) (4,992) 32 Benefits and administrative expenses paid (10,241) (9,683) (1,671) (126) (806) (145) Ending balance 187,836 250,263 4,245 1,873 22,822 1,904 Change in plan assets: Beginning balance 271,846 266,268 — — — — Actual return on plan assets (60,223) 15,261 — — — — Employer contributions — — 1,671 126 806 145 Benefits paid (10,241) (9,683) (1,671) (126) (806) (145) Ending balance 201,382 271,846 — — — — Funded status (1) $ 13,546 $ 21,583 $ (4,245) $ (1,873) $ (22,822) $ (1,904) (1) The overfunded (underfunded) status of each plan is respectively included in Accrued interest receivable and other assets or Accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets, as applicable. Excluding the impact of the merger with Sterling, the change in the total funded status of the defined benefit pension and postretirement benefit plans is primarily attributed to higher actuarial gains due to the increase in discount rate and, for the pension plan only, a negative return on plan assets due to lower market valuations. The following table summarizes the weighted-average assumptions used to determine the benefit obligation at December 31: Discount Rate 2022 2021 Pension: Webster Bank Pension Plan 4.96 % 2.65 % SERP: Webster Bank Supplemental Defined Benefit Plan for Executive Officers 4.88 % 2.45 % Astoria Bank Excess Benefit and Supplemental Benefit Plans 4.77 % n/a Astoria Bank Directors' Retirement Plan 4.70 % n/a Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors 4.70 % n/a Supplemental Executive Retirement Plan of Provident Bank 5.04 % n/a Supplemental Executive Retirement Plan of Provident Bank - Other 4.90 % n/a OPEB: Webster Bank Postretirement Medical Benefit Plan 4.72 % 1.99 % Sterling Bancorp Supplemental Postretirement Life Insurance Plan 4.70 % n/a Astoria Bank Postretirement Welfare Benefit Plans 4.94 % n/a Split Dollar Life Insurance Arrangement 4.63 % n/a The following table summarizes the amounts recorded in accumulated other comprehensive (loss) income that have not yet been recognized in net periodic benefit (income) cost at December 31: Pension SERP OPEB (In thousands) 2022 2021 2022 2021 2022 2021 Net actuarial loss (gain) $ 56,717 $ 41,792 $ 50 $ 658 $ (5,573) $ (620) Deferred tax benefit (expense) 15,383 8,636 14 136 (1,512) (128) Net amount recorded in (AOCL) AOCI $ 41,334 $ 33,156 $ 36 $ 522 $ (4,061) $ (492) The following table summarizes the components of net periodic benefit (income) cost for the years ended December 31: Pension SERP OPEB (In thousands) 2022 2021 2020 2022 2021 2020 2022 2021 2020 Service cost $ — $ — $ — $ — $ — $ — $ 34 $ — $ — Interest cost 5,565 4,663 6,511 107 30 46 652 19 46 Expected return on plan assets (14,675) (14,385) (13,522) — — — — — — Amortization of actuarial loss (gain) 2,224 4,102 4,027 26 38 23 (40) (38) (74) Net periodic benefit (income) cost (1) $ (6,886) $ (5,620) $ (2,984) $ 133 $ 68 $ 69 $ 646 $ (19) $ (28) (1) Net periodic benefit (income) cost is included in Other expense on the accompanying Consolidated Statements of Income. The following table summarizes the weighted-average assumptions used to determine net periodic benefit (income) cost for the years ended December 31: Discount Rate 2022 2021 2020 Pension: Webster Bank Pension Plan 2.65 % 2.29 % 3.07 % SERP: Webster Bank Supplemental Defined Benefit Plan for Executive Officers 2.45 % 1.91 % 2.82 % Astoria Bank Excess Benefit and Supplemental Benefit Plans 2.58 % n/a n/a Astoria Bank Directors' Retirement Plan 2.23 % n/a n/a Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors 2.37 % n/a n/a Supplemental Executive Retirement Plan of Provident Bank 2.76 % n/a n/a Supplemental Executive Retirement Plan of Provident Bank - Other 2.38 % n/a n/a OPEB: Webster Bank Postretirement Medical Benefit Plan 1.99 % 1.40 % 2.50 % Sterling Bancorp Supplemental Postretirement Life Insurance Plan 2.35 % n/a n/a Astoria Bank Postretirement Welfare Benefit Plans 2.93 % n/a n/a Split Dollar Life Insurance Arrangement 2.20 % n/a n/a Expected Long-Term Rate of Return on Plan Assets 2022 2021 2020 Pension: Webster Bank Pension Plan 5.50 % 5.50 % 5.75 % Assumed Health Care Cost Trend Rate (1) 2022 2021 2020 OPEB: Webster Bank Postretirement Medical Benefit Plan 6.25 % 6.50 % 6.50 % Astoria Bank Postretirement Welfare Benefit Plans 6.60 % n/a n/a (1) The rates to which the healthcare cost trend rates are assumed to decline (ultimate trend rates) along with the year that the ultimate trend rates will be reached for the Webster Bank Postretirement Medical Benefit Plan and the Astoria Bank Postretirement Welfare Benefit Plans are 4.40% in 2030, and 4.75% in 2033, respectively. The discount rates used to determine the benefit obligation and net periodic benefit (income) cost for the Company's defined benefit pension and postretirement benefit plans were generally selected by reference to a high-quality bond yield curve, using a full yield curve approach, and matched to the timing and amount of each plan's expected benefit payments. The following table summarizes amounts recognized in other comprehensive (loss) income, including reclassification adjustments, for the years ended December 31: Pension SERP OPEB (In thousands) 2022 2021 2020 2022 2021 2020 2022 2021 2020 Net actuarial loss (gain) $ 17,148 $ (12,008) $ 5,375 $ (581) $ (77) $ 194 $ (4,992) $ 33 $ (307) Amounts reclassified from (2,224) (4,102) (4,027) -4027000 (26) (38) (23) 40 38 74 Total loss (gain) recognized in $ 14,924 $ (16,110) $ 1,348 $ (607) $ (115) $ 171 $ (4,952) $ 71 $ (233) At December 31, 2022, the expected future benefit payments for the Company's defined benefit pension and postretirement benefits plans are as follows: (In thousands) Pension SERP OPEB 2023 $ 10,224 $ 475 $ 2,850 2024 10,804 478 2,669 2025 11,236 460 2,522 2026 11,644 440 2,330 2027 12,046 419 2,153 Thereafter 63,884 1,724 7,800 Asset Management The Pension Plan invests primarily in common collective trusts and registered investment companies. However, the Pension Plan's investment policy guidelines also allow for the investment in cash and cash equivalents, fixed income securities, and equity securities. Common collective trusts and registered investment companies are both benchmarked against the Standard & Poor's 500 Index. Incremental benchmarks used to assess the common collective trusts include the S&P 400 Mid Cap Index, Russell 200 Index, MSCI ACWI ex U.S. Index, and the Barclay's Capital U.S. Long Credit Index. The standard deviation should not exceed that of the composite index. The Pension Plan's investment strategy and asset allocations are monitored by the Company's Retirement Plans Committee with the assistance of external investment advisors, and the investment portfolio is rebalanced, as appropriate. The target asset allocation percentages for the year ended December 31, 2022, were 64.5% The overall investment objective of the Pension Plan is to maintain a diversified portfolio with a targeted expected long-term rate of return on plan assets of approximately 5.50%. The expected long-term rate of return on plans assets is the average rate of return expected to be realized on funds invested or expected to be invested to provide for the benefits included in the benefit obligation. The expected long-term rate of return on plans assets is established at the beginning of the year based upon historical and projected returns for each asset category. Depending on market conditions, the expected long-term rate of return on plan assets may exceed or fall short of the targeted percentage. Fair Value Measurement The following is a description of the valuation methodologies used for the Pension Plan's assets measured at fair value: Common Collective Trusts. Common collective trusts are valued based on the NAV as reported by the trustee of the funds. The funds' underlying investments, which primarily comprise fixed-income debt securities and open-end mutual funds, are valued using quoted market prices in active markets or unobservable inputs for similar assets. Therefore, common collective trusts are classified as Level 2 within the fair value hierarchy. Transactions may occur daily within a trust. If a full redemption of the trust were to be initiated, the investment advisor reserves the right to temporarily delay withdrawals from the trust in order to ensure that the liquidation of securities is carried out in an orderly business manner. Registered Investment Companies. Registered investment companies are valued at the daily closing price as reported by the funds. Registered investment companies held by the Pension Plan are quoted in an active market and are classified as Level 1 within the fair value hierarchy. Cash and Cash Equivalents. Cash and cash equivalents are recorded at cost plus accrued interest, which approximates fair value given the short time frame to maturity, and are classified as Level 1 within the fair value hierarchy. The following table sets forth by level within the fair value hierarchy the Pension Plan's assets at fair value: At December 31, 2022 2021 (In thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Common collective trusts — 172,941 — 172,941 — 230,923 — 230,923 Registered investment companies $ 26,923 $ — $ — $ 26,923 $ 39,082 $ — $ — $ 39,082 Cash and cash equivalents 1,518 — — 1,518 1,841 — — 1,841 Total pension plan assets $ 28,441 $ 172,941 $ — $ 201,382 $ 40,923 $ 230,923 $ — $ 271,846 Multiple-Employer Defined Benefit Pension Plan The Bank participates in a multi-employer plan that provides pension benefits to former employees of a bank acquired by the Company. Participation in the plan was frozen as of September 1, 2004. The plan maintains a single trust and does not segregate the assets or liabilities of its participating employers. Minimum required employer contributions are determined by an independent actuary and are calculated using a 7-year shortfall amortization factor. There are no collective bargaining agreements or other obligations requiring contributions to the plan, nor has a funding improvement plan been implemented. The following table summarizes information related to the Bank's participation in the multi-employer plan: (In thousands) Contributions Funded Status Plan Name Employer Identification Number Plan Number Surcharge Imposed 2022 2021 2020 2022 2021 Pentegra Defined Benefit Plan 13-5645888 333 No $448 $692 $998 At least 80 percent At least 80 percent The Bank's contributions to the multi-employer plan for the years ended December 31, 2022, 2021, and 2020, did not exceed more than 5% of total plan contributions for the plan years ended June 30, 2021, 2020, and 2019. The plan's Form 5500 was not available for the plan year ended June 30, 2022, as of the date the Company's Consolidated Financial Statements were issued. As of July 1, 2022, the date of the most recent actuarial valuation, the plan administrator confirmed that the Bank’s portion of the multi-employer plan was $2.1 million underfunded. Defined Contribution Postretirement Benefit Plans The Bank also sponsors defined contribution postretirement benefit plans established under Section 401(k) of the Internal Revenue Code: Webster Bank Retirement Savings Plan. Employees who have attained age 21 may elect to contribute up to 75% of their eligible compensation on either a pre-tax or post-tax basis. The Bank makes matching contributions equal to 100% of the first 2% and 50% of the next 6% of employees contributions after employees have completed one year of eligible service. If an employee fails to enroll in the plan within 90 days of hire, the employee will be automatically enrolled on a pre-tax basis with a deferral rate set at 3% of eligible compensation. Individuals who became employees of the Company as a result of the merger with Sterling are not eligible to participate in the plan. Sterling National Bank 401k and Profit Sharing Plan. Eligible legacy Sterling employees as January 31, 2022, who are now employees of the Company may elect to contribute up to 50% of their eligible compensation to the plan. The Bank makes matching contributions equal to 50% of employee contributions up to 4% of eligible compensation, for a maximum match of 2%, and a profit sharing contribution equal to 3% of eligible compensation for all eligible legacy Sterling employees, regardless of whether they had contributed to the plan in the current year. The plan also includes an automatic employee deferral increase provision, whereby deferral contributions for participants who had been automatically enrolled in the plan will increase by 1% every January 1 up to 10%. Compensation and benefits expense included total employer contributions under the plans of $18.2 million, $13.1 million, and $13.8 million for the years ended December 31, 2022, 2021, and 2020, respectively.

Share-Based Plans

Share-Based Plans	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Share-Based Plans	Share-Based Plans The Company maintains a stock compensation plan that provides for the grant of stock options, stock appreciation rights, restricted stock, performance-based stock, and stock units to better align the interests of its employees and directors with those of its stockholders. The number of shares of Webster common stock approved by stockholders that could be issued under the plan is 17.4 million shares. At December 31, 2022, there were 2.6 million shares remaining to be granted. Stock compensation expense is recognized over the required service vesting period for each award based on the grant-date fair value, and is included in Compensation and benefits on the accompanying Consolidated Statements of Income. The following table summarizes stock-based compensation plan activity for the year ended December 31, 2022: Non-Vested Restricted Stock Awards Outstanding Stock Options Outstanding Time-Based Performance-Based Number of Weighted-Average Number of Weighted-Average Number of Weighted-Average Balance, beginning of period 529,284 $ 48.77 266,417 $ 50.03 107,612 $ 23.05 Granted (1) 711,503 54.95 307,852 57.66 — — Sterling replacement awards (2) 1,185,499 56.81 — — 10,972 29.14 Adjustment (3) 187,915 56.81 (187,915) 47.43 — — Vested (993,512) 48.69 (59,400) 56.14 — — Forfeited (140,947) 51.43 (16,580) 55.63 — — Exercised — — — — (30,355) 23.18 Balance, end of period 1,479,742 50.47 310,374 57.65 88,229 23.76 (1) Includes 127,524 shares for performance-based awards that were granted to certain executives on February 1, 2022, in order to incentivize their efforts to promote the integration of Webster and Sterling. One-third of these awards will be eligible to vest each year, in an amount ranging from 50% to 100% of target, based on the achievement of performance metrics in each of the three performance periods, and generally subject to the executive's continued employment. (2) The Company issued 1,126,495 shares of common stock and reissued 59,004 shares from Treasury stock in order to satisfy its consideration to replace Sterling equity awards under the merger agreement. During the year ended December 31, 2022, the Company recognized an increase of $18.8 million in stock compensation expense related to the replacement equity awards. (3) Due to the impact of the merger with Sterling on the level of achievement of target performance conditions for the open performance periods applicable to outstanding awards, certain non-vested performance-based restricted stock awards were converted into time-based restricted stock awards on January 31, 2022. Restricted Stock Awards Time-based restricted stock awards vest over the applicable service period ranging from one Performance-based restricted stock awards generally vest after a three year performance period, with the total share quantity dependent on the Company meeting certain target performance conditions throughout the vesting period, ranging from 0% to 150%. Under the plan, 50% of the share quantity is determined based on total stockholder return as compared to the Company's compensation peer group, while the other 50% is based on the Company's average return on equity. The fair value of performance-based restricted stock awards used to determine compensation expense is calculated using the Monte-Carlo simulation model for total stockholder return awards and the closing price of Webster common stock at the grant date for For the years ended December 31, 2022, 2021, and 2020, the Company recognized restricted stock compensation expense totaling $55.1 million, $13.7 million, and $12.2 million, respectively. The corresponding income tax benefit recognized was $12.0 million, $5.4 million, and $2.6 million, respectively. The fair value of restricted stock awards that had vested during the years ended December 31, 2022, 2021, and 2020, was $51.7 million, $12.5 million, and $13.5 million, respectively. At December 31, 2022, there was $36.3 million of unrecognized restricted stock expense related to non-vested restricted stock awards, which is expected to be recognized over a weighted-average period of 1.8 years. Stock Options Stock options are granted at an exercise price equal to the market value of Webster common stock on the grant date. Each stock option grants the holder the right to acquire one share of Webster common stock over a contractual life of ten years. The Company has not granted stock options since 2013. At December 31, 2022, there were 10,278 and 77,951 incentive and Total pre-tax intrinsic value, or the difference between the Webster common stock closing price on the last trading day of the year and the weighted-average exercise price multiplied by the number of shares, represents the aggregate intrinsic value that would have been received by the option holders had all of their outstanding options been exercised on December 31, 2022. At December 31, 2022, the total pre-tax intrinsic value was $2.1 million. For the years ended December 31, 2022, 2021, and 2020, the total intrinsic value of the options exercised was $1.0 million, $9.0 million, and $0.1 million, respectively. The amount of cash received from the exercise of stock options during the years ended December 31, 2022, 2021, and 2020, was $0.7 million, $7.1 million, and $0.2 million, respectively.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company’s operations are organized into three reportable segments that represent its primary businesses: Commercial Banking, HSA Bank, and Consumer Banking. These segments reflect how executive management responsibilities are assigned, how discrete financial information is evaluated, the type of customer served, and how products and services are provided. Certain Treasury activities, along with the amounts required to reconcile profitability metrics to those reported in accordance with GAAP, are included in the Corporate and Reconciling category. Effective January 1, 2022, the Company realigned its investment services operations from Commercial Banking to Consumer Banking (called Retail Banking in 2021) to better serve its customers and deliver operational efficiencies. Under this realignment, $125.4 million of deposits and $4.3 billion of assets under administration (off-balance sheet) were reassigned from Commercial Banking to Consumer Banking. The Company also realigned certain product management and customer contact center operations from both Commercial Banking and Consumer Banking to the Corporate and Reconciling category, which resulted in an insignificant reassignment of assets and liabilities. There was no goodwill reallocation nor goodwill impairment as a result of these realignments. In addition, the non-interest expense allocation methodology was modified to exclude certain overhead and merger-related costs that are not directly related to segment performance. Prior period balance sheet information and results of operations have been recast accordingly to reflect these realignments. As discussed previously in Note 2: Mergers and Acquisitions, Webster acquired Sterling on January 31, 2022, and the allocation of the purchase price is considered preliminary at December 31, 2022. Accordingly, of the total $1.9 billion in preliminary goodwill recorded, $1.7 billion and $0.2 billion was preliminarily allocated to Commercial Banking and Consumer Banking, respectively. The $36.0 million of goodwill recorded in connection with the Bend acquisition was allocated entirely to HSA Bank. Segment Reporting Methodology The Company 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 the Company 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. The Company allocates interest income and interest expense to each business through an internal matched maturity 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. The Company allocates a majority of non-interest expense to each reportable segment using an activity and driver-based costing process. Costs, including shared services and back-office support areas, are analyzed, pooled by process, and assigned to the appropriate reportable segment. The combination of direct revenue, direct expenses, funds transfer pricing, and allocations of non-interest expense produces PPNR, which is the basis the segments are reviewed by executive management. The Company 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. The ACL on loans and leases is included in total assets within the Corporate and Reconciling category. Business development expenses, such as merger-related and strategic initiatives costs, are also generally included in the Corporate and Reconciling category. The following table presents balance sheet information, including the appropriate allocations, for the Company's reportable segments and the Corporate and Reconciling category: At December 31, 2022 (In thousands) Commercial HSA Consumer Corporate and Consolidated Goodwill $ 1,904,291 $ 57,779 $ 552,034 $ — $ 2,514,104 Total assets 44,380,582 122,729 10,625,334 16,148,876 71,277,521 At December 31, 2021 (In thousands) Commercial HSA Consumer Corporate and Consolidated Goodwill $ 131,000 $ 21,813 $ 385,560 $ — $ 538,373 Total assets 15,398,159 73,564 7,663,921 11,779,955 34,915,599 The following tables present operating results, including the appropriate allocations, for the Company’s reportable segments and the Corporate and Reconciling category: Year ended December 31, 2022 (In thousands) Commercial HSA Consumer Corporate and Consolidated Net interest income $ 1,346,384 $ 218,149 $ 720,789 $ (251,036) $ 2,034,286 Non-interest income 171,437 104,586 119,691 45,069 440,783 Non-interest expense 398,100 151,329 426,133 420,911 1,396,473 Pre-tax, pre-provision net revenue 1,119,721 171,406 414,347 (626,878) 1,078,596 Provision (benefit) for credit losses 276,550 — (3,754) 7,823 280,619 Income before income taxes 843,171 171,406 418,101 (634,701) 797,977 Income tax expense 207,188 45,937 108,657 (208,088) 153,694 Net income $ 635,983 $ 125,469 $ 309,444 $ (426,613) $ 644,283 Year ended December 31, 2021 (In thousands) Commercial HSA Consumer Corporate and Consolidated Net interest income $ 585,297 $ 168,595 $ 375,318 $ (228,121) $ 901,089 Non-interest income 83,538 102,814 95,887 41,133 323,372 Non-interest expense 192,977 134,258 297,217 120,648 745,100 Pre-tax, pre-provision net revenue 475,858 137,151 173,988 (307,636) 479,361 (Benefit) for credit losses (51,348) — (3,068) (84) (54,500) Income before income taxes 527,206 137,151 177,056 (307,552) 533,861 Income tax expense 134,965 36,619 42,139 (88,726) 124,997 Net income $ 392,241 $ 100,532 $ 134,917 $ (218,826) $ 408,864 Year ended December 31, 2020 (In thousands) Commercial HSA Consumer Corporate and Consolidated Net interest income $ 512,691 $ 162,363 $ 334,157 $ (117,818) $ 891,393 Non-interest income 66,867 100,826 97,778 19,806 285,277 Non-interest expense 181,218 133,919 334,008 109,801 758,946 Pre-tax, pre-provision net revenue 398,340 129,270 97,927 (207,813) 417,724 Provision (benefit) for credit losses 152,571 — (14,722) (99) 137,750 Income before income taxes 245,769 129,270 112,649 (207,714) 279,974 Income tax expense 61,086 34,501 24,956 (61,190) 59,353 Net income $ 184,683 $ 94,769 $ 87,693 $ (146,524) $ 220,621

Revenue from contracts with Cus

Revenue from contracts with Customers Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers The following tables summarize revenues recognized in accordance with ASC Topic 606, Revenue from Contracts with Customers. These disaggregated amounts, together with sources of other non-interest income that are subject to other GAAP topics, have been reconciled to non-interest income by reportable segment as presented within Note 21: Segment Reporting. Year ended December 31, 2022 (In thousands) Commercial HSA Consumer Corporate and Consolidated Non-interest Income: Deposit service fees $ 27,663 $ 97,654 $ 71,353 $ 1,802 $ 198,472 Loan and lease related fees (1) 21,498 — — — 21,498 Wealth and investment services 11,350 — 28,957 (30) 40,277 Other — 6,932 1,493 — 8,425 Revenue from contracts with customers 60,511 104,586 101,803 1,772 268,672 Other sources of non-interest income 110,926 — 17,888 43,297 172,111 Total non-interest income $ 171,437 $ 104,586 $ 119,691 $ 45,069 $ 440,783 Year ended December 31, 2021 (In thousands) Commercial HSA Consumer Corporate and Consolidated Non-interest Income: Deposit service fees $ 16,933 $ 94,844 $ 50,561 $ 372 $ 162,710 Wealth and investment services 12,152 — 27,471 (37) 39,586 Other — 7,970 2,140 — 10,110 Revenue from contracts with customers 29,085 102,814 80,172 335 212,406 Other sources of non-interest income 54,453 — 15,715 40,798 110,966 Total non-interest income $ 83,538 $ 102,814 $ 95,887 $ 41,133 $ 323,372 Year ended December 31, 2020 (In thousands) Commercial HSA Consumer Corporate and Consolidated Non-interest Income: Deposit service fees $ 14,740 $ 92,693 $ 48,493 $ 106 $ 156,032 Wealth and investment services 10,644 — 22,307 (35) 32,916 Other — 8,133 1,656 — 9,789 Revenue from contracts with customers 25,384 100,826 72,456 71 198,737 Other sources of non-interest income 41,483 — 25,322 19,735 86,540 Total non-interest income $ 66,867 $ 100,826 $ 97,778 $ 19,806 $ 285,277 (1) A portion of loan and lease related fees comprises income generated from factored receivables and payroll financing activities that is within the scope of ASC Topic 606. These revenue streams were new to the Company in 2022 due to the businesses acquired in connection with the Sterling merger. Contracts with customers did not generate significant contract assets and liabilities at December 31, 2022, and 2021. Major Revenue Streams Deposit service fees consist of fees earned from commercial and consumer customer deposit accounts, such as account maintenance and cash management/analysis fees, as well as other transactional service charges (i.e., insufficient funds, wire transfer, stop payment fees, etc.). Performance obligations for account maintenance services and cash management/analysis fees are satisfied on a monthly basis at a fixed transaction price, whereas performance obligations for other deposit service charges that result from various customer-initiated transactions are satisfied at a point-in-time when the service is rendered. Payment for deposit service fees is generally received immediately or in the following month through a direct charge to the customers' accounts. Certain commercial customer contracts include credit clauses, whereby the Company will grant credit upon the customer meeting pre-determined conditions, which can be used to offset fees. On occasion, the Company may also waive certain fees. Fee waivers are recognized as a reduction to revenue in the period the waiver is granted to the customer. Due to the insignificance of the amounts waived, the Company does not reduce its transaction price to reflect any variable consideration. The deposit service fees revenue stream also includes interchange fees earned from debit and credit card transactions. The transaction price for interchange services is based on the transaction value and the interchange rate set by the card network. Performance obligations for interchange fees are satisfied at a point-in-time when the cardholders' transaction is authorized and settled. Payment for interchange fees is generally received immediately or in the following month. Factored receivables non-interest income consists of fees earned from accounts receivable management services. The Company factors accounts receivable, with and without recourse, for customers whereby the Company purchases their accounts receivable at a discount and assumes the risk, as applicable, and ownership of the assets through direct cash receipt from the end consumer. Factoring services are performed in exchange for a non-refundable fee at a transaction price based on a percentage of the gross invoice amount of each receivable purchased, subject to a minimum required amount. The performance obligation for factoring services is generally satisfied at a point-in-time when the receivable is assigned to the Company. However, should the commission earned not meet or exceed the minimum required annual amount, the difference between that and the actual amount is recognized at the end of the contract term. Other fees associated with factoring receivables may include wire transfer and technology fees, field examination fees, and Uniform Commercial Code fees, where the performance obligations are satisfied at a point-in-time when the services are rendered. Payment from the customer for factoring services is generally received immediately or within the following month. Payroll finance non-interest income consists of fees earned from performing payroll financing and business process outsourcing services, including full back-office technology and tax accounting services, along with payroll preparation, making payroll tax payments, invoice billings, and collections for independently-owned temporary staffing companies nationwide. Performance obligations for payroll finance and business processing activities are either satisfied upon completion of the support services or as payroll remittances are made on behalf of customers to fund their employee payroll, which generally occurs on a weekly basis. The agreed-upon transaction price is based on a fixed-percentage per the terms of the contract, which could be subject to a hold-back reserve to provide for any balances that are assessed to be at risk of collection. When the Company collects on amounts due from end consumers on behalf of its customers and at the time of financing payroll, the Company retains the agreed-upon transaction price payable for the performance of its services and remits an amount to the customer net of any advances and payroll tax withholdings, as applicable. Wealth and investment services consist of fees earned from asset management, trust administration, and investment advisory services, and through facilitating securities transactions. Performance obligations for asset management and trust administration services are satisfied on a monthly or quarterly basis at a transaction price based on a percentage of the period-end market value of the assets under administration. Payment for asset management and trust administration services is generally received a few days after period-end through a direct charge to the customers' accounts. Performance obligations for investment advisory services are satisfied over the period in which the services are provided through a time-based measurement of progress, and the agreed-upon transaction price with the customer varies depending on the nature of the services performed. Performance obligations for facilitating securities transactions are satisfied at a point-in-time when the securities are sold at a transaction price that is based on a percentage of the contract value. Payment for both investment advisory services and facilitating securities transactions may be received in advance of the service, but generally is received immediately or in the following period, in arrears.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Credit-Related Financial Instruments In the normal course of business, the Company offers financial instruments with off-balance sheet risk to meet the financing needs of its customers. These transactions include commitments to extend credit, standby letters of credit, and commercial letters of credit, which involve, to varying degrees, elements of credit risk. The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk: At December 31, (In thousands) 2022 2021 Commitments to extend credit $ 11,237,496 $ 6,870,095 Standby letters of credit 380,655 224,061 Commercial letters of credit 53,512 58,175 Total credit-related financial instruments with off-balance sheet risk $ 11,671,663 $ 7,152,331 The Company enters into contractual commitments to extend credit to its customers (i.e., revolving credit arrangements, term loan commitments, and short-term borrowing agreements), generally with fixed expiration dates or other termination clauses and that require payment of a fee. Substantially all of the Company's commitments to extend credit are contingent upon its customers maintaining specific credit standards at the time of loan funding, and are often secured by real estate collateral. Since the majority of the Company's commitments typically expire without being funded, the total contractual amount does not necessarily represent the Company's future payment requirements. Standby letters of credit are written conditional commitments issued by the Company to guarantee its customers' performance to a third party. In the event the customer does not perform in accordance with the terms of its agreement with a third-party, the Company would be required to fund the commitment. The contractual amount of each standby letter of credit represents the maximum amount of potential future payments the Company could be required to make. Historically, the majority of the Company's standby letters of credit expire without being funded. However, if the commitment were funded, the Company has recourse against the customer. The Company's standby letter of credit agreements are often secured by cash or other collateral. Commercial letters of credit are issued to finance either domestic or foreign customer trade arrangements. As a general rule, drafts are committed to be drawn when the goods underlying the transaction are in transit. Similar to standby letters of credit, the Company's commercial letter of credit agreements are often secured by the underlying goods subject to trade. The following table summarizes the activity in the ACL on unfunded loan commitments, which provides for the unused portion of commitments to lend that are not unconditionally cancellable by the Company: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 13,104 $ 12,755 $ 2,367 Adoption of CECL — — 9,139 ACL established in the Sterling merger 6,749 — — Provision for credit losses 7,854 349 1,249 Balance, end of period $ 27,707 $ 13,104 $ 12,755 Litigation The Company is subject to certain legal proceedings and unasserted claims and assessments in the ordinary course of business. Legal contingencies are evaluated based on information currently available, including advice of counsel and assessment of available insurance coverage. The Company establishes an accrual for specific legal matters when it determines that the likelihood of an unfavorable outcome is probable and the loss is reasonably estimable. Once established, each accrual is adjusted to reflect any subsequent developments. Legal contingencies are subject to inherent uncertainties, and unfavorable rulings may occur that could cause the Company to either adjust its litigation accrual or incur actual losses that exceed the current estimate, which ultimately could have a material adverse effect, either individually or in the aggregate, on its business, financial condition, or operating results. The Company will consider settlement of cases when it is in the best interests of the Company and its stakeholders. The Company intends to defend itself in all claims asserted against it, and management currently believes that the outcome of these contingencies will not be material, either individually or in the aggregate, to the Company or its consolidated financial position.

Parent Company Information

Parent Company Information	12 Months Ended
	Dec. 31, 2022
Condensed Financial Information Disclosure [Abstract]
Parent Company Information	Parent Company Financial Information The following tables summarize condensed financial information for the Parent Company only: CONDENSED BALANCE SHEETS December 31, (In thousands) 2022 2021 Assets: Cash and due from banks $ 305,331 $ 316,193 Intercompany debt securities 150,000 150,000 Investment in subsidiaries 8,631,202 3,526,782 Alternative investments 46,349 20,163 Other assets 13,358 3,953 Total assets $ 9,146,240 $ 4,017,091 Liabilities and stockholders’ equity: Senior notes $ 480,878 $ 485,611 Subordinated notes 514,930 — Junior subordinated debt 77,320 77,320 Accrued interest payable 7,457 5,861 Due to subsidiaries 3,858 488 Other liabilities 5,611 9,486 Total liabilities 1,090,054 578,766 Stockholders’ equity 8,056,186 3,438,325 Total liabilities and stockholders’ equity $ 9,146,240 $ 4,017,091 CONDENSED STATEMENTS OF INCOME Years ended December 31, (In thousands) 2022 2021 2020 Income: Dividend income from bank subsidiary $ 475,000 $ 200,000 $ 20,000 Interest income on securities and interest-bearing deposits 5,955 3,444 5,530 Alternative investments income 6,416 13,033 2,467 Other non-interest income 112 75 634 Total income 487,483 216,552 28,631 Expense: Interest expense on borrowings 34,284 16,876 18,684 Merger-related expenses 40,314 16,266 — Other non-interest expense 22,592 15,921 16,426 Total expense 97,190 49,063 35,110 Income (loss) before income taxes and equity in undistributed earnings of subsidiaries 390,293 167,489 (6,479) Income tax benefit 20,799 3,121 4,572 Equity in undistributed earnings of subsidiaries 233,191 238,254 222,528 Net income $ 644,283 $ 408,864 $ 220,621 CONDENSED STATEMENTS OF COMPREHENSIVE INCOME Years ended December 31, (In thousands) 2022 2021 2020 Net income $ 644,283 $ 408,864 $ 220,621 Other comprehensive (loss) income, net of tax: Derivative instruments 226 226 2,622 Other comprehensive (loss) income of subsidiaries (662,606) (65,062) 75,706 Other comprehensive (loss) income, net of tax (662,380) (64,836) 78,328 Comprehensive (loss) income $ (18,097) $ 344,028 $ 298,949 CONDENSED STATEMENTS OF CASH FLOWS Years ended December 31, (In thousands) 2022 2021 2020 Operating activities: Net income $ 644,283 $ 408,864 $ 220,621 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries (233,191) (238,254) (222,528) Common stock contribution to charitable foundation 10,500 — — Other, net (2,853) 3,562 29,697 Net cash provided by operating activities $ 418,739 $ 174,172 $ 27,790 Investing activities: Alternative investments (capital call), net of distributions (16,292) (6,304) (3,751) Net cash received in business combination 193,238 — — Net cash provided by (used in) investing activities 176,946 (6,304) (3,751) Financing activities: Dividends paid to common stockholders (247,767) (145,223) (144,967) Dividends paid to preferred stockholders (13,725) (7,875) (7,875) Exercise of stock options 703 3,492 240 Common stock repurchase program (322,103) — (76,556) Common shares acquired related to stock compensation plan activity (23,655) (4,384) (3,506) Net cash (used in) by financing activities (606,547) (153,990) (232,664) Net (decrease) increase in cash and cash equivalents (10,862) 13,878 (208,625) Cash and cash equivalents at beginning of year 316,193 302,315 510,940 Cash and cash equivalents at end of year $ 305,331 $ 316,193 $ 302,315

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsThe Company has evaluated subsequent events from the date of the Consolidated Financial Statements, and accompanying Notes thereto, through the date of issuance, and determined that, except for the acquisition of interLINK discussed within

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The Consolidated Financial Statements have been prepared in accordance with GAAP, and include the accounts of the Company and all other entities in which the Company has a controlling financial interest. Intercompany transactions and balances have been eliminated in consolidation. Assets under administration or assets under management that the Company holds or manages in a fiduciary or agency capacity for customers are not included on the accompanying Consolidated Balance Sheets. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications did not have a significant impact on the Company's Consolidated Financial Statements.
Variable Interest Entities	Principles of Consolidation The purpose of Consolidated Financial Statements is to present the results of operations and the financial position of the Company and its subsidiaries as if the consolidated group were a single economic entity. In accordance with the applicable accounting guidance for consolidations, the Consolidated Financial Statements include any VOE in which the Company has a controlling financial interest and any VIE for which the Company is deemed to be the primary beneficiary. The Company generally consolidates its VOEs if the Company, directly or indirectly, owns more than 50% of the outstanding voting shares of the entity, and if the non-controlling stockholders do not hold any substantive participating or controlling rights. The Company evaluates VIEs to understand the purpose and design of the entity, and its involvement in the ongoing activities of the VIE, and will consolidate the VIE if it has (i) the power to direct the activities of the VIE that most significantly affect the VIE's economic performance, and (ii) an obligation to absorb losses of the VIE, or the right to receive benefits from the VIE, that could potentially be significant to the VIE. The Company accounts for unconsolidated partnerships and certain other investments using the equity method of accounting if it has the ability to significantly influence the operating and financial policies of the investee. This is generally presumed to exist when the Company owns between 20% and 50% of a corporation, or when it has greater than 3% to 5% interest in a limited partnership or similarly structured entity. Additional information regarding consolidated and non-consolidated VIEs can be found within Note 15: Variable Interest Entities. Use of Estimates The preparation of the Consolidated Financial Statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Business Combinations Business combinations are accounted for under the acquisition method, in which the identifiable assets acquired and liabilities assumed are generally measured and recognized at fair value as of the acquisition date, with the excess of the purchase price over the fair value of the net assets acquired recognized as goodwill. Items such as acquired ROU lease assets and operating lease liabilities as lessee, employee benefit plans, and income-tax related balances are recognized in accordance with other applicable GAAP, which may result in measurements that differ from fair value. Business combinations are included in the Consolidated Financial Statements from the respective dates of acquisition. Historical reporting periods reflect only the results of legacy Webster operations. Merger-related costs are expensed in the period incurred and presented within the applicable
Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents is comprised of cash and due from banks and interest-bearing deposits. Cash equivalents have a maturity of three months or less. Cash and due from banks includes cash on hand, certain deposits at the FRB, and cash due from banks. Restricted cash related to Federal Reserve System requirements and cash collateral received on derivative positions are included in Cash and due from banks. Interest-bearing deposits includes deposits at the FRB in excess of reserve requirements, if any, and federal funds sold to other financial institutions.
Investment Securities	Investments in Debt Securities Debt security transactions are recognized on the trade date, which is the date the order to buy or sell the security is executed. Investments in debt securities are classified as AFS or HTM at the time of purchase. Any classification change subsequent to the trade date is reviewed for compliance with corporate objectives and accounting policies. Debt securities classified as AFS are recorded at fair value with unrealized gains and losses recorded as a component of (AOCL). If a debt security is transferred from AFS to HTM, it is recorded at fair value at the time of transfer and any respective gain or loss would be recorded as a separate component of (AOCL) and amortized as an adjustment to interest income over the remaining life of the security. Debt securities classified as AFS are reviewed for credit losses when the fair value of a security falls below the amortized cost basis and the decline is evaluated to determine if any portion is attributable to credit loss. The decline in fair value attributable to credit loss is recorded directly to earnings, with a corresponding allowance for credit loss, limited to the amount that fair value is less than the amortized cost. If the credit quality subsequently improves, previously recorded allowance amounts may be reversed. An AFS debt security will be placed on non-accrual status if collection of principal and interest in accordance with contractual terms is doubtful. When the Company intends to sell an impaired AFS debt security, or if it is more likely than not that the Company will be required to sell the security prior to recovery of the amortized cost basis, the entire fair value adjustment will immediately be recognized in earnings through non-interest income. The gain or loss on sale is calculated using the carrying value plus any related accumulated (AOCL) balance associated with the securities sold. Debt securities classified as HTM are those in which the Company has the ability and intent to hold to maturity. Debt securities classified as HTM are recorded at amortized cost net of unamortized premiums and discounts. Discount accretion income and premium amortization expense are recognized as interest income using the effective interest method, with consideration given to prepayment assumptions on mortgage backed securities. Premiums are amortized to the earliest call date for debt securities purchased at a premium, with explicit, non-contingent call features and are callable at a fixed price and preset date. Debt securities classified as HTM are reviewed for credit losses under the CECL model with an allowance recorded on the balance sheet for expected lifetime credit losses. The ACL is calculated on a pooled basis using statistical models which include forecasted scenarios of future economic conditions. Forecasts revert to long-run loss rates implicitly through the economic scenario, generally over three years. If the risk for a particular security no longer matches the collective assessment pool, it is removed and individually assessed for credit deterioration. The non-accrual policy for HTM debt securities is the same as for AFS debt securities. A zero credit loss assumption is maintained for U.S. Treasuries and agency-backed securities in both the AFS and HTM portfolios, as applicable. This assumption is subject to quarterly review to ensure it remains appropriate. Additional information regarding investments in debt securities can be found within Note 3: Investment Securities. Investments in Equity Securities The Company’s accounting treatment for non-consolidated equity investments differs for those with and without readily determinable fair values. Equity investments with readily determinable fair values are recorded at fair value with changes in fair value recorded in non-interest income. For equity investments without readily determinable fair values, the Company elected the measurement alternative, and therefore carries these investments at cost, less impairment, if any, plus or minus changes in observable prices. Certain equity investments that do not have a readily available fair value may qualify for NAV measurement based on specific requirements. The Company's alternative investments accounted for at NAV consist of investments in non-public entities that generally cannot be redeemed since the Company’s investments are distributed as the underlying equity is liquidated. On a quarterly basis, the Company reviews its equity investments without readily determinable fair values for impairment. If the equity investment is considered impaired, an impairment loss equal to the amount by which the carrying value exceeds its fair value is recorded through a charge to earnings. The impairment loss may be reversed in a subsequent period if there are observable transactions for the identical or similar investment of the same issuer at a higher amount than the carrying amount that was established when the impairment was recognized. Impairments, as well as upward or downward adjustments resulting from observable price changes in orderly transactions for identical or similar investments, are included in non-interest income. Equity investments in entities that finance affordable housing and other community development projects provide a return primarily through the realization of tax benefits. The Company applies the proportional amortization method to account for its investments in qualified affordable housing projects. Investment in Federal Home Loan Bank and Federal Reserve Bank Stock The Bank is a member of the FHLB and the Federal Reserve System, and is required to maintain an investment in capital stock of both the FHLB and FRB. Based on redemption provisions, FHLB and FRB stock has no quoted market value and is carried at cost. Membership stock is reviewed for impairment if economic circumstances would warrant review.
Loans Held for Sale	Loans Held for Sale Loans that are classified as held for sale at the time of origination are accounted for under the fair value option. Loans not originated for sale but subsequently transferred to held for sale are valued at the lower of cost or fair value on an individual asset basis. Any cost amount in excess of fair value is recorded as a valuation allowance and recognized as a reduction of other non-interest income. Gains or losses on the sale of loans held for sale are recorded either as part of Mortgage banking activities or Other income on the accompanying Consolidated Statements of Income. Cash flows from the sale of loans that were originated for sale are presented within Operating activities on the accompanying Consolidated Statements of Cash Flows, whereas cash flows from the sale of loans that were originated for investment and then subsequently transferred to held for sale are presented within Investing activities. Additional information regarding mortgage banking activities and loans sold can be found within Note 5: Transfers and Servicing of Financial Assets.
Transfers and Servicing of Financial Assets	Transfers and Servicing of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is generally considered to have been surrendered when: (i) the transferred assets are legally isolated from the Company or its consolidated affiliates, even in bankruptcy or other receivership, (ii) the transferee has the right to pledge or exchange the assets with no conditions that constrain the transferee and provide more than a trivial benefit to the Company, and (iii) the Company does not maintain the obligation or unilateral ability to reclaim or repurchase the assets. The Company sells financial assets in the normal course of business, the majority of which are residential mortgage loan sales to government-sponsored enterprises through established programs, as well as commercial loan sales through participation agreements, and other individual or portfolio loan and securities sales. In accordance with the accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. With the exception of servicing, the Company’s continuing involvement with financial assets sold is minimal, and generally is limited to market customary representation and warranty clauses covering certain characteristics of the mortgage loans that were sold, and the Company's origination process. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets, the consideration received, and any other assets obtained or liabilities incurred in exchange for the transferred assets. When the Company sells financial assets, it may retain servicing rights and/or other interests in the financial assets. Servicing assets and any other interests held by the Company are recorded at fair value upon transfer, and subsequently carried at the lower of cost or fair value. Additional information regarding transfers of financial assets and mortgage servicing assets can be found within Note 5: Transfers and Servicing of Financial Assets.
Loans and Leases	Loans and Leases Loans and leases are stated at the principal amount outstanding, net of amounts charged-off, unamortized premiums and discounts, and deferred loan and lease fees or costs, which are recognized as yield adjustments using the effective interest method. These yield adjustments are amortized over the contractual life of the related loans and leases and are adjusted for prepayments, as applicable. Interest on loans and leases is credited to interest income as earned based on the interest rate applied to principal amounts outstanding. Amounts of cash receipts and cash payments for loans and leases are presented net within Investing activities on the Consolidated Statements of Cash Flows. Non-accrual Loans Loans are placed on non-accrual status when full collection of principal and interest in accordance with contractual terms is not expected based on available information, which generally occurs when principal or interest payments become 90 days delinquent unless the loan is well secured and in the process of collection, or sooner if circumstances indicate that the borrower may be unable to meet contractual principal or interest payments. The Company considers a loan to be “well-secured” when it is secured by collateral in the form of liens on or pledges of real or personal property that have a realizable value sufficient to discharge the debt in full, or when it is secured by a contractual guarantee of a financially responsible party. The Company considers a loan “in the process of collection” if collection of the debt is proceeding in due course either through legal action or through collection efforts not involving legal action that are reasonably expected to result in repayment of the debt or in its restoration to a current status in the near future. When loans and leases are placed on non-accrual status, the accrual of interest income and the amortization or accretion of premiums, discounts, and deferred fees and costs is discontinued, and any previously accrued interest is reversed as a reduction of interest income. For commercial loans and leases, if the Company determines that repayment of non-accrual loans and leases is not expected, any payment received is applied to principal until the unpaid balance has been fully recovered. Any excess is then credited to interest income. For consumer loans, if the Company determines that principal can be repaid, interest payments are taken into income as received on a cash basis. Loans are generally removed from non-accrual status when they become current as to principal and interest or demonstrate a period of performance under the contractual terms and, in the opinion of management, are fully collectible as to principal and interest. For commercial loans, a sustained period of repayment performance is generally required. All TDRs qualify for return to accrual status once the borrower has demonstrated performance with the restructured terms of the loan agreement for a minimum of six consecutive months. Pursuant to regulatory guidance, a loan discharged under Chapter 7 of the U.S. bankruptcy code is removed from non-accrual status when full repayment of the remaining pre-discharged contractual principal and interest is expected, and there have been at least six consecutive months of current payments. Additional information regarding
Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments	Allowance for Credit Losses on Loans and Leases The ACL on loans and leases, which is established through a provision charged to expense, is a contra-asset account that offsets the amortized cost basis of loans and leases for the credit losses that are expected to occur over the life of the asset. Executive management reviews and advises on the adequacy of the allowance, which is maintained at a level that management deems to be sufficient to cover expected credit losses within the loan and lease portfolios. The Company has elected to present accrued interest receivable separately from the amortized cost basis of Loans and leases on the accompanying Consolidated Balance Sheets. An ACL on accrued interest for a loan is not measured as accrued interest income is reversed against interest income for non-accrual loans immediately after their non-accrual classification. The ACL on loans and leases is determined using the CECL model, whereby an expected lifetime credit loss is recognized at the origination or purchase of an asset, including those acquired through a business combination, which is then reassessed at each reporting date over the contractual life of the asset. The calculation of expected credit losses includes consideration of past events, current conditions, and reasonable and supportable economic forecasts that affect the collectability of the reported amounts. Generally, expected credit losses are determined through a pooled, collective assessment of loans and leases with similar risk characteristics. However, if the risk characteristics of a loan or lease change such that it no longer matches that of the collectively assessed pool, it is removed from the population and individually assessed for credit losses. The total ACL on loans and leases recorded by management represents the aggregated estimated credit loss determined through both the collective and individual assessments. Collectively Assessed Loans and Leases. Collectively assessed loans and leases are segmented based on product type, credit quality, risk ratings, and/or collateral types within its commercial and consumer portfolios, and expected losses are determined using a PD, LGD, EAD, loss rate, or discounted cash flow framework. Expected credit losses are calculated as the product of the probability of a loan defaulting, expected loss given the occurrence of a default, and the expected exposure of a loan at default. Summing the product across loans over their lives yields the lifetime expected credit losses for a given portfolio. The Company’s PD and LGD calculations are predictive models that measure the current risk profile of the loan pools using forecasts of future macroeconomic conditions, historical loss information, and credit risk ratings. 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. A (7) "Special Mention" rating has a potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the asset. A (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 asset with the added characteristic that the weakness makes collection or liquidation in full given current facts, conditions, and values improbable. Assets classified as a (10) "Loss" rating are considered uncollectible and charged-off. Risk ratings, which are assigned to differentiate risk within the portfolio, are reviewed on an ongoing basis and revised to reflect changes in a borrower's current financial position and outlook, risk profile, and the related collateral and structural position. Loan officers review updated financial information or other loan factors on at least an annual basis for all pass rated loans to assess the accuracy of the risk grade. Criticized loans undergo more frequent reviews and enhanced monitoring. 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 and a higher FICO score is indicative of lower credit risk. FICO scores are updated at least on a quarterly basis. The factors such as past due status, employment status, collateral, geography, loans discharged in bankruptcy, and the status of first lien position loans on second lien position loans, are also considered to be consumer portfolio credit quality indicators. For portfolio monitoring purposes, the Company estimates the current value of property secured as collateral for home equity and residential first mortgage lending products on an ongoing basis. The estimate is based on home price indices compiled by the S&P/Case-Shiller Home Price Indices. Real estate price data is applied to the loan portfolios taking into account the age of the most recent valuation and geographic area. The Company’s models incorporate a single economic forecast scenario and macroeconomic assumptions over a reasonable and supportable forecast period. The development of the reasonable and supportable forecast period assumes that each macroeconomic variable will revert to long-term expectations, with reversion characteristics unique to specific economic indicators and forecasts. Reversion towards long-term expectations generally begins two to three years from the forecast start date and is complete within three to five years. Certain models use output reversion and revert to mean historical loss rates on a straight-line basis in the third year of the forecast. Other models use input reversion and revert to the mean of macroeconomic variables in reasonable and supportable forecasts. Historical loss rates are based on approximately 10 years of recently available data and are updated annually. The calculation of EAD follows an iterative process to determine the expected remaining principal balance of a loan based on historical paydown rates for loans of a similar segment within the same portfolio. The calculation of portfolio exposure in future quarters incorporates expected losses and principal paydowns (the combination of contractual repayments and voluntary prepayments). A portion of the collective ACL is comprised of qualitative adjustments for risk characteristics that are not reflected or captured in the quantitative models, but are likely to impact the measurement of estimated credit losses. Macroeconomic variables are used as inputs to the loss models and are selected based on the correlation of the variables to credit losses for each class of financing receivable as follows: the commercial models use unemployment, gross domestic product, commercial real estate price indices, and retail sales (for commercial unfunded); the residential model uses the Case-Shiller Home Price Index; the home equity loan and line of credit models use interest rate spreads between U.S. Treasuries and corporate bonds and, in addition, the home equity loan model also uses the Federal Housing Finance Agency Home Price Index; and the personal loan and credit line models use the Case-Shiller Home Price Index and Federal Housing Finance Agency Home Price Index. Forecasted economic scenarios are sourced from a third party. Data from the baseline forecast scenario is used as the input to the modeled loss calculation. Changes in forecasts of macroeconomic variables will impact expectations of lifetime credit losses calculated by the loss models. However, the impact of changes in macroeconomic forecasts may be different for each portfolio and will reflect the credit quality and nature of the underlying assets at that time. To further refine the expected loss estimate, qualitative factors are used reflecting consideration of credit concentration, credit quality trends, the quality of internal loan reviews, the nature and volume of portfolio growth, staffing levels, underwriting exceptions, and other economic considerations that are not reflected in the base loss model. Management may apply additional qualitative adjustments to reflect other relevant facts and circumstances that impact expected credit losses. These economic and qualitative inputs are used to forecast expected losses over the reasonable and supportable forecast period. In addition to the above considerations, the ACL calculation includes expectations of prepayments and recoveries. Extensions, renewals, and modifications are not included in the collective assessment. However, if there is a reasonable expectation of a TDR, the loan is removed from the collective assessment pool and is individually assessed. Individually Assessed Loans and Leases. When loans and leases no longer match the risk characteristics of the collectively assessed pool, they are removed from the collectively assessed population and individually assessed for credit losses. Generally, all non-accrual loans, TDRs, potential TDRs, loans with a charge-off, and collateral dependent loans where the borrower is experiencing financial difficulty, are individually assessed. Individual assessment for collateral dependent commercial loans facing financial difficulty is based on the fair value of the collateral less estimated cost to sell, the present value of the expected cash flows from the operation of the collateral, or a scenario weighted approach of both of these methods. If a loan is not collateral dependent, the individual assessment is based on a discounted cash flow approach. For collateral dependent commercial loans and leases, the Company's process requires the Company to determine the fair value of the collateral by obtaining a third-party appraisal or asset valuation, an interim valuation analysis, blue book reference, or other internal methods. Fair value of the collateral for commercial loans is reevaluated quarterly. Whenever the Company has a third-party real estate appraisal performed by independent licensed appraisers, a licensed in-house appraisal officer or qualified individual reviews these appraisals for compliance with the Financial Institutions Reform Recovery and Enforcement Act and the Uniform Standards of Professional Appraisal Practice. Individual assessments for residential and home equity loans are based on a discounted cash flow approach or the fair value of collateral less the estimated costs to sell. Other consumer loans are individually assessed using a loss factor approach based on historical loss rates. For residential and consumer collateral dependent loans, a third-party appraisal is obtained upon loan default. Fair value of the collateral for residential and consumer collateral dependent loans is reevaluated every six months, by either obtaining a new appraisal or other internal valuation method. Fair value is also reassessed, with any excess amount charged off, for residential and home equity loans that reach 180 days past due per Federal Financial Institutions Examination Council guidelines. A fair value shortfall relative to the amortized cost balance is reflected as a valuation allowance within the ACL on loans and leases. Subsequent to an appraisal or other fair value estimate, should reliable information come to management's attention that the value has declined further, an additional allowance may be recorded to reflect the particular situation, thereby increasing the ACL on loans and leases. If the credit quality subsequently improves, the allowance is reversed up to a maximum of the previously recorded credit losses. Any individually assessed loan for which no specific valuation allowance is necessary is the result of either sufficient cash flow or sufficient collateral coverage relative to the amortized cost. Additional information regarding the ACL on loans and leases can be found within Note 4: Loans and Leases. Prior to the adoption of CECL on January 1, 2020, the ALLL was determined under the ALLL incurred loss model, which reflected management’s best estimate of probable losses that may be incurred within the existing loan and lease portfolio as of the balance sheet date. The ALLL consisted of three elements: (i) specific valuation allowances established for probable losses on impaired loans and leases; (ii) quantitative valuation allowances calculated using loss experience for like loans and leases with similar characteristics and trends, adjusted, as necessary, to reflect the impact of current conditions; and (iii) qualitative factors determined based on general economic conditions and other factors that may be internal or external to the Company. The reserve level reflected management’s view of trends in losses, portfolio quality, and economic, political, and regulatory conditions. While management utilized its best judgment based on the information available at the time, the ultimate adequacy of the allowance was dependent upon a variety of factors that were beyond the Company’s control, which included the performance its portfolio, economic conditions, interest rate sensitivity, and other external factors. The process for estimating probable losses under the ALLL approach was based on predictive models that measured the current risk profile of the loan and lease portfolio and combined the measurement with other quantitative and qualitative factors. To measure credit risk for the commercial, commercial real estate, and equipment financing portfolios, the Company employed a dual grade credit risk grading system for estimating the PD and the LGD. The credit risk grade system under the ALLL model is the same as described under the CECL approach. For the Company's consumer portfolio, credit risk factors are also consistent with the factors used in the CECL approach. Back-testing was performed to compare original estimated losses and actual observed losses, resulting in ongoing refinements. The balance resulting from this process, together with specific valuation allowances, determined the overall reserve level. Charge-off of Uncollectible Loans If all or a portion of a loan is deemed to be no longer collectible upon the occurrence of a loss-confirming event, a charge-off may be recognized. Charge-offs reduce the amortized cost basis of the loan with a corresponding reduction to the ACL. For commercial loans, loss confirming events usually involve the receipt of specific adverse information about the borrower. The Company will generally recognize charge-offs for commercial loans on a case-by-case basis based on the review of the entire credit relationship and financial condition of the borrower. Loss-confirming events for consumer loans, such as bankruptcy or protracted delinquency, are typically based on established thresholds rather than by specific adverse information about the borrower. PCD Loans and Leases PCD loans and leases are defined as those that have experienced a more-than-insignificant deterioration in credit quality since origination. The Company considers a variety of factors to evaluate and identify whether acquired loans are PCD, including but not limited to, nonaccrual status, delinquency, TDR classification, partial charge-offs, decreases in FICO scores, risk rating downgrades, and other factors. Upon acquisition, expected credit losses are added to the fair value of individual PCD loans and leases to determine the amortized cost basis. After initial recognition, any changes to the estimate of expected credit losses, favorable or unfavorable, are recorded as a provision for credit loss during the period of change. PCD accounting is also applied to loans and leases previously charged-off by the acquiree if the Company has contractual rights to the cash flows at the acquisition date. The Company recognizes an additional ACL for amounts previously charged-off by the acquiree with a corresponding increase to the amortized costs basis of the acquired asset. Balances deemed to be uncollectible are immediately charged-off in accordance with the Company’s charge-off policies, resulting in the establishment of the initial ACL for PCD loans and leases to be recorded net of these uncollectible balances. Allowance for Credit Losses on Unfunded Loan Commitments The ACL on unfunded loan commitments provides for potential exposure inherent with funding the unused portion of legal commitments to lend that are not unconditionally cancellable by the Company. Accounting for unfunded loan commitments follows the CECL model. The calculation of the allowance includes the probability of funding to occur and a corresponding estimate of expected lifetime credit losses on amounts assumed to be funded. Loss calculation factors are consistent with the ACL methodology for funded loans using the PD and LGD applied to the underlying borrower risk and facility grades, a draw down factor applied to utilization rates, relevant forecast information, and management's qualitative factors. The ACL on unfunded credit commitments is included within Accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets. Additional information regarding the ACL on unfunded loan commitments can be found within
Troubled Debt Restructurings	Troubled Debt Restructurings A modified loan is considered a TDR when the following two conditions are met: (i) the borrower is experiencing financial difficulty, and (ii) the modification constitutes a concession. The Company considers all aspects of the restructuring in determining whether a concession has been granted, including the borrower's ability to access funds at a market rate. In general, a concession exists when the modified terms of the loan are more attractive to the borrower than standard market terms. Modified terms are dependent upon the financial position and needs of the individual borrower. The most common types of modifications include covenant modifications and forbearance. Loans for which the borrower has been discharged under Chapter 7 bankruptcy are considered collateral dependent TDRs, impaired at the date of discharge, and charged down to the fair value of collateral less cost to sell, if management considers that loss potential likely exists. The Company’s policy is to place consumer loan TDRs, except those that were performing prior to TDR status, on non-accrual status for a minimum period of six months. Commercial TDRs are evaluated on a case-by-case basis when determining whether or not to place them on non-accrual status. Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months. TDRs are individually assessed loans and reported as TDRs for the remaining life of the loan. TDR classification may be removed if the borrower demonstrates compliance with the modified terms for a minimum of six months and through a year-end, and the restructuring agreement specifies a market rate of interest equal to that which would be provided to a borrower with similar credit at the time of restructuring. In the limited circumstance that a loan is removed from TDR classification, it is the Company’s policy to continue to base its measure of loan impairment on the contractual terms specified by the loan agreement. Additional information regarding TDRs can be found within Note 4: Loans and Leases.
Foreclosed and Repossessed Assets	Foreclosed and Repossessed Assets Real estate acquired through foreclosure or completion of a deed in lieu of foreclosure and other assets acquired through repossession are recorded at fair value less estimated cost to sell at the date of transfer. Subsequent to the acquisition date, the foreclosed and repossessed assets are carried at the lower of cost or fair value less estimated selling costs and are included within Other assets on the accompanying Consolidated Balance Sheets. Independent appraisals generally are obtained to substantiate fair value and may be subject to adjustment based upon historical experience or specific geographic trends impacting the property. Upon transfer to OREO, the excess of the loan balance over fair value less cost to sell is charged off against the ACL. Subsequent write-downs in value, maintenance costs as incurred, and gains or losses upon sale are charged to Other expense on the accompanying Consolidated Statements of Income.
Premises and Equipment	Property and Equipment Property and equipment is carried at cost, less accumulated depreciation and amortization. Depreciation and amortization is computed on a straight-line basis over the estimated useful lives of the assets, as illustrated in the following table. If shorter, leasehold improvements are amortized over the terms of the respective leases. Minimum Maximum Building and improvements 5 - 40 years Leasehold improvements 5 - 20 years Furniture, fixtures, and equipment 5 - 10 years Data processing equipment and software 3 - 7 years Repairs and maintenance costs are expensed as incurred, while significant improvements are capitalized. Property and equipment that is actively marketed for sale is reclassified to assets held for disposition. The cost and accumulated depreciation and amortization of property and equipment that is sold, retired, or otherwise disposed of, is eliminated from accounts and any resulting gain or loss is recorded as Other income or Other expense, respectively, on the accompanying Consolidated Statements of Income. Additional information regarding property and equipment can be found within Operating Leasing As lessee, ROU lease assets and their corresponding lease liabilities are recognized on the lease commencement date. A ROU asset is measured based on the present value of the future minimum lease payments, adjusted for any initial direct costs, incentives, or other payments prior to the lease commencement date. A lease liability represents a legal obligation to make lease payments and is measured based on the present value of the future minimum lease payments, discounted using the rate implicit in the lease or the Company’s incremental borrowing rate. Variable lease payments that are dependent on either an index or rate are initially measured using the index or rate at the commencement date and included in the measurement of the lease liability. Renewal options are not included as part of the ROU asset or lease liability unless the renewal option is deemed reasonably certain to exercise. ROU lease assets and operating lease liabilities are included in Premises and equipment and Accrued expenses and other liabilities, respectively, on the accompanying Consolidated Balance Sheets. For real estate leases, lease components and non-lease components are accounted for as a single lease component if the
Goodwill	Goodwill Goodwill represents the excess purchase price of businesses acquired over the fair value of the identifiable net assets acquired and is assigned to specific reporting units. Goodwill is not subject to amortization but rather is evaluated for impairment annually, or more frequently if events occur or circumstances change indicating it would more likely than not result in a reduction of the fair value of the reporting units below their carrying value, including goodwill. Goodwill may be evaluated for impairment by first performing a qualitative assessment. If the qualitative assessment indicates that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill, or, if for any other reason the Company determines to it be appropriate, then a quantitative assessment will be performed. The quantitative assessment process utilizes an income and market approach to arrive at an indicated fair value range for the reporting units. The fair value calculated for each reporting unit is compared to its carrying amount, including goodwill, to ascertain if goodwill impairment exists. If the fair value exceeds the carrying amount, including goodwill for a reporting unit, it is not considered to be impaired. If the fair value is below the carrying amount, including goodwill for a reporting unit, then an impairment charge is recognized for the amount by which the carrying amount exceeds the calculated fair value, up to but not exceeding the amount of goodwill allocated to the reporting unit. The resulting amount is charged to Other expense on the accompanying Consolidated Statements of Income. The Company completed a qualitative assessment for its reporting units during its most recent annual impairment review. Based on this qualitative assessment, the Company determined that there was no evidence of impairment to the balance of its goodwill. Additional information regarding goodwill can be found within Note 8: Goodwill and Other Intangible Assets.
Other Intangible Assets	Other Intangible Assets Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights, or because it is capable of being sold or exchanged either separately or in combination with a related contract, asset, or liability. Other intangible assets with finite useful lives, such as core deposits and customer relationships, are amortized to non-interest expense over their estimated useful lives and are evaluated for impairment whenever events occur or circumstances change indicating that the carrying amount of the asset may not be recoverable. Additional information regarding other intangible assets can be found within Note 8: Goodwill and Other Intangible Assets.
Cash Surrender Value of Life Insurance	Cash Surrender Value of Life Insurance Bank-owned life insurance represents the cash surrender value of life insurance policies on certain current and former employees of Webster and Sterling. Cash surrender value increases and decreases are recorded in non-interest income. Death benefit proceeds in excess of the cash surrender value are recorded in other non-interest income upon the death of the insured.
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase These agreements are accounted for as secured financing transactions since the Company maintains effective control over the transferred investment securities and the transfer meets the other criteria for such treatment. Obligations to repurchase the sold investment securities are reflected as a liability on the accompanying Consolidated Balance Sheets. The investment securities sold with agreement to repurchase to wholesale dealers are transferred to a custodial account for the benefit of the dealer or to the bank with whom each transaction is executed. The dealers or banks may sell, loan, or otherwise dispose of such securities to other parties in the normal course of their operations and agree to resell to the Company the same securities at the maturity date of the agreements. The Company also enters into repurchase agreements with Bank customers. The investment securities sold with agreement to repurchase to Bank customers are not transferred, but internally pledged to the repurchase agreement transaction. Additional information regarding securities sold under agreements to repurchase can be found within
Revenue Recognition for Alternative Revenue Programs, Policy [Policy Text Block]	Revenue From Contracts With Customers Revenue from contracts with customers comprises non-interest income earned in exchange for services provided to customers and is recognized either when services are completed or as they are rendered. These revenue streams include Deposit service fees, Wealth and investment services, and non-significant portions of Loan and lease related fees and Other income on the accompanying Consolidated Statements of Income. The Company identifies the performance obligations included in its contracts with customers, determines the transaction price, allocates the transaction price to the performance obligations, as applicable, and recognizes revenue when the performance obligations are satisfied. Services provided over a period of time are generally transferred to customers evenly over the term of the contracts, and revenue is recognized evenly over the period the services are provided. Contract assets are included in accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. Payment terms vary by services offered, and generally the time between the completion of performance obligations and receipt of payment is not significant. Additional information regarding contracts with customers can be found within Note 22: Revenue from Contracts with Customers.
Share-based Compensation	Share-Based Compensation The Company maintains a stock compensation plan that provides for the grant of stock options, stock appreciation rights, restricted stock, performance-based stock, and stock units to employees and directors. Share awards are issued from available treasury shares. Stock compensation expense is recognized over the required service vesting period for each award based on the grant date fair value, and is included within Compensation and benefits expense on the accompanying Consolidated Statements of Income. Share awards are generally subject to a one-year vesting period, while certain conditions provide for a one-year vesting period. For time-based restricted stock awards and average return on equity performance-based restricted stock awards, fair value is measured using the closing price of Webster common stock at the grant date. For total stockholder return performance-based restricted stock awards, fair value is measured using the Monte Carlo simulation model. Performance-based restricted stock awards ultimately vest in a range from 0% to 150% of the target number of shares under the grant. Compensation expense may be subject to adjustment based on management's assessment of the Company's average return on equity performance relative to the target number of shares condition. Stock option awards use the Black-Scholes Option-Pricing Model to measure fair value at the grant date. Excess tax benefits or tax deficiencies result when tax return deductions differ from recognized compensation cost determined using the grant-date fair value approach for financial statement purposes. Dividends are paid on time-based shares upon grant and are non-forfeitable, while dividends are accrued on performance-based awards and paid with the vested shares when the performance target is met. Additional information regarding share-based compensation can be found within Note 20: Share-Based Plans.
Income Taxes	Income Taxes Income tax expense (benefit) is comprised of two components, current and deferred. The current component represents income taxes payable or refundable for the current period based on applicable tax laws, while the deferred component represents the tax effects of temporary differences between amounts recognized for financial accounting and tax purposes. DTAs and DTLs reflect the tax effects of such differences that are anticipated to result in taxable or deductible amounts in the future when the temporary differences reverse. DTAs are recognized if it is more likely than not that they will be realized, and may be reduced by a valuation allowance if it is more likely than not that all or some portion will not be realized. Uncertain tax positions that meet a more likely than not recognition threshold are initially and subsequently measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon settlement with a taxing authority based on knowledge of all relevant information. The determination of whether or not a tax position meets the more likely than not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management judgment. The Company recognizes interest and penalties on uncertain tax positions and interest on refundable income taxes as a component of Income tax expense and Other income, respectively, on the accompanying Consolidated Statements of Income. Additional information regarding income taxes can be found within Note 9: Income Taxes.
Earnings Per Common Share	Earnings per Common Share Earnings per common share is calculated under the two-class method. Basic earnings per common share is computed by dividing earnings applicable to common stockholders by the weighted-average number of common shares outstanding, excluding outstanding participating securities, during the pertinent period. Certain unvested restricted stock awards are considered participating securities as they have non-forfeitable rights to dividends. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of shares resulting from stock compensation and warrants for common stock using the treasury stock method. A reconciliation between the weighted-average common shares used in calculating basic earnings per common share and the weighted-average common shares used in calculating diluted earnings per common share can be found within
Comprehensive Income	Comprehensive Income (Loss) Comprehensive income (loss) includes all changes in equity during the period, except those resulting from transactions with stockholders. Comprehensive income comprises net income and the after-tax effect changes in the following items: net unrealized gain (loss) on AFS securities, net unrealized gain (loss) on derivative instruments, and net actuarial gain (loss) related to defined benefit pension and other postretirement benefit plans. Comprehensive income is reported on the accompanying Consolidated Statements of Stockholders' Equity and the accompanying Consolidated Statements of Comprehensive Income. Additional information regarding comprehensive (loss) income can be found within
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities Derivatives are recognized at fair value and are included in Accrued interest receivable and other assets and Accrued expenses and other liabilities, as applicable, on the accompanying Consolidated Balance Sheets. The value of exchange-traded contracts is based on quoted market prices, whereas non-exchange traded contracts are valued based on dealer quotes, pricing models, discounted cash flow methodologies, or similar techniques in which the determination of fair value may require management judgment or estimation. Net cash flows from derivative contract assets and liabilities are presented within Operating activities on the accompanying Consolidated Statements of Cash Flows. Derivatives Designated in Hedge Relationships. The Company uses derivatives to hedge exposures or to modify interest rate characteristics for certain balance sheet accounts under its interest rate risk management strategy. The Company designates derivatives in qualifying hedge relationships either as fair value or cash flow hedges for accounting purposes. Derivative financial instruments receive hedge accounting treatment if they are qualified and properly designated as a hedge, and remain highly effective in offsetting changes in the fair value or cash flows attributable to the risk being hedged, both at hedge inception and on an ongoing basis throughout the life of the hedge. Quarterly prospective and retrospective assessments are performed to ensure hedging relationships continue to be highly effective. If a hedge relationship is no longer highly effective, hedge accounting would be discontinued. The change in fair value on a derivative that is designated and qualifies as a fair value hedge, as well as the offsetting change in fair value on the hedged item attributable to the risk being hedged, is recognized in earnings. The gain or loss on a derivative that is designated and qualifies as a cash flow hedge is initially recorded as a component of (AOCL), and either subsequently reclassified to interest income as hedged interest payments are received or to interest expense as hedged interest payments are made during the same period in which the hedged transaction affects earnings. Derivatives Not Designated in Hedge Relationships . The Company also enters into derivative transactions that are not designated in hedge relationships. Derivative financial instruments not designated in hedge relationships are recorded at fair value with changes in fair value recognized in Other income on the accompanying Consolidated Statements of Income. Offsetting Assets and Liabilities . The Company presents derivative assets and derivative liabilities with the same counterparty and the related variation margin of cash collateral on a net basis on the accompanying Consolidated Balance Sheets. Cash collateral relating to initial margin is included in Accrued interest receivable and other assets. Securities collateral is not offset. The Company clears all dealer eligible contracts through clearing houses and has elected to record non-cleared derivative positions subject to a legally enforceable master netting agreement on a net basis. Additional information regarding derivatives can be found within Note 17: Derivative Financial Instruments.
Fair Value Measurements	Fair Value Measurements The Company measures many of its assets and liabilities on a fair value basis in accordance with ASC Topic 820, Fair Value Measurement. Fair value is defined as 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 used to measure certain assets and liabilities on a recurring basis when fair value is the primary basis of accounting, and on a non-recurring basis when evaluating assets or liabilities for impairment. Additional information regarding the Company's policies and methodologies used to measure fair value can be found within Note 18: Fair Value Measurements.
Employee Retirement Benefit Plan	Employee Retirement Benefit Plans The sponsors defined contribution postretirement benefit plans established under Section 401(k) of the Internal Revenue Code. Expenses to maintain the plans, as well as employer contributions, are charged to Compensation and benefits expense on the accompanying Consolidated Statements of Income. The Bank had offered a qualified noncontributory defined benefit pension plan and a non-qualified SERP to eligible employees and key executives who met certain age and service requirements, both of which were frozen effective December 31, 2007. The Bank also provides for OPEB to certain retired employees. In connection with the merger with Sterling, the Company also assumed the benefit obligations of Sterling's non-qualified SERP and OPEB plans. Pension contributions are funded in accordance with the requirements of the Employee Retirement Income Security Act. Net periodic benefit (income) cost, which is based upon actuarial computations of current and future benefits for eligible employees, are charged to Other expense on the accompanying Consolidated Statements of Income. The funded status of the plans is recorded as an asset when over-funded or a liability when under-funded. Additional information regarding the defined benefit pension and postretirement benefit plans can be found within Note 19: Retirement Benefit Plans.
Recently Adopted and Issued Accounting Standards Updates	Accounting Standards Adopted During the Current Year ASU No. 2022-06—Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 On December 21, 2022, the FASB issued ASU 2022-06 to defer the sunset date of the temporary, optional expedients related to the accounting for contract modifications and hedging transactions as a result of the anticipated transition away from the use of LIBOR and other interbank offered rates to alternative reference rates. In response to the United Kingdoms’s Financial Conduct Authority's extension of the cessation date of LIBOR in the United States to June 30, 2023, the FASB has deferred the expiration date of these optional expedients to December 31, 2024. The ASU became effective upon issuance and affords the Company an extended period to utilize the currently available optional expedients related to the accounting for contract modifications and hedging transactions as a result of the anticipated transition away from the use of LIBOR and other inter-bank offered rates. Relevant Accounting Standards Issued But Not Yet Adopted ASU No. 2022-02—Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU No. 2022-02, which eliminates the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance in paragraphs 310-20-35-9 through 35-11 to determine whether a modification results in a new loan or a continuation of an existing loan. In addition, ASU No. 2022-02 requires that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost in the vintage disclosures required by paragraph 326-20-50-6. ASU No. 2022-02 is effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years, with early adoption permitted. The amendments should be applied prospectively, however, an entity has the option to apply a modified retrospective transition method related to the recognition and measurement of TDRs, which would result in a cumulative-effect adjustment to retained earnings in the period of adoption. The Company adopted the Update on ASU No. 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions In June 2022, the FASB issued ASU No. 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions, which clarifies that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security, and therefore, is not considered in measuring fair value. The amendments also clarify that an entity cannot, as a separate unit of account, recognize and measure a contractual sale restriction, and require the following disclosures for equity securities subject to contractual sale restrictions: (i) the fair value of equity securities subject to contractual sale restrictions reflected on the balance sheet; (ii) the nature and remaining duration of the restriction(s); and (iii) the circumstances that could cause a lapse in the restriction(s). ASU No. 2022-03 is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. For all entities except investment companies, the amendments should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The Company is currently evaluating the impact of this standard; however, the Company does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements and disclosures.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Property, Plant and Equipment	Property and equipment is carried at cost, less accumulated depreciation and amortization. Depreciation and amortization is computed on a straight-line basis over the estimated useful lives of the assets, as illustrated in the following table. If shorter, leasehold improvements are amortized over the terms of the respective leases. Minimum Maximum Building and improvements 5 - 40 years Leasehold improvements 5 - 20 years Furniture, fixtures, and equipment 5 - 10 years Data processing equipment and software 3 - 7 years The following table summarizes the components of premises and equipment: At December 31, (In thousands) 2022 2021 Land $ 73,916 $ 9,436 Buildings and improvements 106,180 67,501 Leasehold improvements 84,477 65,606 Furniture, fixtures, and equipment 71,542 64,890 Data processing equipment and software 128,153 105,516 Property and equipment 464,268 312,949 Less: Accumulated depreciation and amortization (225,152) (228,318) Property and equipment, net 239,116 84,631 ROU lease assets, net 191,068 119,926 Premises and equipment, net $ 430,184 $ 204,557

Investments, All Other Investme

Investments, All Other Investments (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, All Other Investments [Abstract]
Activity in Affordable Housing Program Obligation	The following table summarizes the Company's LIHTC investments and related unfunded commitments: At December 31, (In thousands) 2022 2021 Gross investment in LIHTC investments (1) $ 797,453 $ 68,635 Accumulated amortization (69,424) (25,216) Net investment in LIHTC investments $ 728,029 $ 43,419 Unfunded commitments for LIHTC investments (1) $ 335,959 $ 11,106 (1) The Company acquired $517.0 million of LIHTC investments and assumed $267.3 million of unfunded commitments for LIHTC investments in connection with the Sterling merger on January 31, 2022.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Summary of Purchase Price Consideration	The following table summarizes the determination of the purchase price consideration: (In thousands, except share and per share data) Webster common stock issued 87,965,239 Price per share of Webster common stock on January 31, 2022 $ 56.81 Consideration for outstanding common stock 4,997,305 Consideration for preferred stock exchanged 138,942 Consideration for replacement equity awards (1) 43,877 Cash in lieu of fractional shares 176 Total purchase price consideration $ 5,180,300
Summary of Purchase Price Allocation	The following table summarizes the preliminary allocation of the purchase price to the fair value of the identifiable assets acquired and liabilities assumed from Sterling: (In thousands) Unpaid Principal Balance Fair Value Purchase price consideration $ 5,180,300 Assets: Cash and due from banks 510,929 Interest-bearing deposits 3,207 Investment securities AFS 4,429,948 FHLB and FRB Stock 150,502 Loans held for sale 23,517 Loans and leases: Commercial non-mortgage $ 5,570,782 5,527,657 Asset-based 694,137 683,958 Commercial real estate 6,790,600 6,656,405 Multi-family 4,303,381 4,255,906 Equipment financing 1,350,579 1,314,311 Warehouse lending 647,767 643,754 Residential 1,313,785 1,281,637 Home equity 132,758 122,553 Other consumer 12,559 12,525 Total loans and leases $ 20,816,348 20,498,706 Deferred tax assets, net (51,487) Premises and equipment (1) 264,421 Other intangible assets 210,100 Bank-owned life insurance policies 645,510 Accrued interest receivable and other assets 960,893 Total assets acquired $ 27,646,246 Liabilities: Non-interest-bearing deposits $ 6,620,248 Interest-bearing deposits 16,643,755 Securities sold under agreements to repurchase and other borrowings 27,184 Long-term debt 516,881 Accrued expenses and other liabilities (1) 597,643 Total liabilities assumed $ 24,405,711 Net assets acquired 3,240,535 Goodwill $ 1,939,765 (1) Includes $100.0 million of ROU lease assets operating lease liabilities
Schedule of PCD Loans and Leases by Portfolio Segment	The following table reconciles the unpaid principal balance to the fair value of PCD loans and leases by portfolio segment: (In thousands) Commercial Consumer Total Unpaid principal balance $ 3,394,963 $ 541,471 $ 3,936,434 ACL at acquisition (115,464) (20,852) (136,316) Non-credit (discount) (40,947) (2,784) (43,731) Fair value 3,238,552 517,835 3,756,387
Summary of Supplemental Pro Forma Information	The following table summarizes supplemental pro forma financial information giving effect to the merger as if it had been completed on January 1, 2021: Years ended December 31, (In thousands) 2022 2021 Net interest income $ 1,961,005 $ 1,802,862 Non-interest income 440,783 487,301 Net income 869,639 574,927
Summary of Supplemental Pro Forma Information Adjustments	In addition, the supplemental pro forma financial information was adjusted for merger-related expenses, as follows: Years ended December 31, (In thousands) 2022 2021 Compensation and benefits (1) $ 79,001 $ 13,987 Occupancy (2) 36,586 256 Technology and equipment (3) 24,688 290 Marketing 416 — Professional and outside services (4) 73,070 22,273 Other expense (5) 32,700 648 Total merger-related expenses $ 246,461 $ 37,454 (1) Comprised primarily of employee severance and retention costs, and executive restricted stock awards. (2) Comprised primarily of charges associated with the Company’s 2022 corporate real estate consolidation plan. Additional information regarding this corporate real estate consolidation plan can be found within Note 6: Premises and Equipment and (3) Comprised primarily of technology contract termination costs. (4) Comprised primarily of advisory, legal, and consulting fees. (5) Comprised primarily of disposals on property and equipment, contract termination costs, and other miscellaneous expenses.
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the change in accrued expenses and other liabilities for the year ended December 31, 2022, as it relates to severance and contract termination costs, which were primarily incurred in connection with the Sterling merger: (In thousands) Severance Contract Termination Total Balance, beginning of period $ 10,835 $ — $ 10,835 Additions charged to expense 36,092 34,152 70,244 Cash payments (35,014) (3,790) (38,804) Other (1) (4,330) — (4,330) Balance, end of period $ 7,583 $ 30,362 $ 37,945 (1) Primarily reflects the release of $4.1 million from the Company's severance accrual at the beginning of the year. In connection with the Sterling merger, the Company re-evaluated its strategic priorities as a combined organization, which resulted in modifications to the Company's strategic initiatives that were announced in December 2020.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Summary of Investment Securities	Available-for-Sale The following table summarizes the amortized cost and fair value of AFS securities by major type: At December 31, 2022 (In thousands) Amortized Unrealized Unrealized Losses Fair Value U.S. Treasury notes $ 755,968 $ — $ (38,928) $ 717,040 Government agency debentures 302,018 — (43,644) 258,374 Municipal bonds and notes 1,719,110 5 (85,913) 1,633,202 Agency CMO 64,984 — (5,019) 59,965 Agency MBS 2,461,337 26 (303,339) 2,158,024 Agency CMBS 1,664,600 — (258,114) 1,406,486 CMBS 929,588 — (32,948) 896,640 CLO 2,108 — (1) 2,107 Corporate debt 795,999 — (91,587) 704,412 Private label MBS 48,895 — (4,646) 44,249 Other 12,548 — (350) 12,198 Total AFS securities $ 8,757,155 $ 31 $ (864,489) $ 7,892,697 At December 31, 2021 (In thousands) Amortized Unrealized Unrealized Losses Fair Value U.S. Treasury notes $ 398,664 $ — $ (1,698) $ 396,966 Agency CMO 88,109 2,326 (51) 90,384 Agency MBS 1,568,293 36,130 (11,020) 1,593,403 Agency CMBS 1,248,548 2,537 (18,544) 1,232,541 CMBS 887,640 506 (1,883) 886,263 CLO 21,860 — (13) 21,847 Corporate debt 14,583 — (1,133) 13,450 Total AFS securities $ 4,227,697 $ 41,499 $ (34,342) $ 4,234,854 Accrued interest receivable on AFS securities of $36.9 million and $7.5 million at December 31, 2022, and 2021, respectively, is excluded from amortized cost and is reported in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets.
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	Unrealized Losses The following tables summarize the gross unrealized losses and fair value of AFS securities by length of time each major security type has been in a continuous unrealized loss position: At December 31, 2022 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ 337,563 $ (19,167) $ 379,477 $ (19,761) 23 $ 717,040 $ (38,928) Government agency debentures 258,374 (43,644) — — 19 258,374 (43,644) Municipal bonds and notes 1,616,771 (85,913) — — 444 1,616,771 (85,913) Agency CMO 55,693 (4,640) 4,272 (379) 39 59,965 (5,019) Agency MBS 1,641,544 (206,412) 515,206 (96,927) 460 2,156,750 (303,339) Agency CMBS 485,333 (68,674) 921,153 (189,440) 132 1,406,486 (258,114) CMBS 273,150 (8,982) 598,490 (23,966) 52 871,640 (32,948) CLO — — 2,107 (1) 1 2,107 (1) Corporate debt 692,990 (89,692) 8,421 (1,895) 105 701,411 (91,587) Private label MBS 44,249 (4,646) — — 3 44,249 (4,646) Other 12,198 (350) — — 4 12,198 (350) Total AFS securities in an unrealized loss position $ 5,417,865 $ (532,120) $ 2,429,126 $ (332,369) 1,282 $ 7,846,991 $ (864,489) At December 31, 2021 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ 396,966 $ (1,698) $ — $ — 8 $ 396,966 $ (1,698) Agency CMO 7,895 (51) — — 2 7,895 (51) Agency MBS 506,602 (7,354) 110,687 (3,666) 70 617,289 (11,020) Agency CMBS 632,213 (6,163) 335,480 (12,381) 28 967,693 (18,544) CMBS 724,762 (1,744) 81,253 (139) 50 806,015 (1,883) CLO — — 21,848 (13) 1 21,848 (13) Corporate debt 4,203 (76) 9,247 (1,057) 3 13,450 (1,133) Total AFS securities in an unrealized loss position $ 2,272,641 $ (17,086) $ 558,515 $ (17,256) 162 $ 2,831,156 $ (34,342)
Debt Securities, Held-to-maturity	The following table summarizes the amortized cost, fair value, and ACL of HTM securities by major type: At December 31, 2022 (In thousands) Amortized Unrealized Gains Unrealized Losses Fair Value Allowance Net Carrying Value Agency CMO $ 28,358 $ — $ (2,060) $ 26,298 $ — $ 28,358 Agency MBS 2,626,114 827 (339,592) 2,287,349 — 2,626,114 Agency CMBS 2,831,949 845 (407,648) 2,425,146 — 2,831,949 Municipal bonds and notes 928,845 1,098 (47,183) 882,760 182 928,663 CMBS 149,613 — (9,713) 139,900 — 149,613 Total HTM securities $ 6,564,879 $ 2,770 $ (806,196) $ 5,761,453 $ 182 $ 6,564,697 At December 31, 2021 (In thousands) Amortized Unrealized Gains Unrealized Losses Fair Value Allowance Net Carrying Value Agency CMO $ 42,405 $ 655 $ (25) $ 43,035 $ — $ 42,405 Agency MBS 2,901,593 71,444 (11,788) 2,961,249 — 2,901,593 Agency CMBS 2,378,475 11,202 (43,844) 2,345,833 — 2,378,475 Municipal bonds and notes 705,918 51,572 — 757,490 214 705,704 CMBS 169,948 3,381 — 173,329 — 169,948 Total HTM securities $ 6,198,339 $ 138,254 $ (55,657) $ 6,280,936 $ 214 $ 6,198,125 The following table summarizes HTM securities pledged for deposits, borrowings, and other purposes: At December 31, (In thousands) 2022 At 2021 HTM securities pledged for deposits, at amortized cost $ 1,596,777 $ 1,834,117 HTM securities pledged for borrowings and other, at amortized cost 260,735 1,243,139 Total HTM securities pledged $ 1,857,512 $ 3,077,256
Debt Securities, Held-to-maturity, Allowance for Credit Loss	The following table summarizes the activity in the ACL on HTM securities: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 214 $ 299 $ — Adoption of CECL — — 397 (Benefit) for credit losses (32) (85) (98) Balance, end of period $ 182 $ 214 $ 299
Summary of Debt Securities by Contractual Maturity	The following table summarizes the amortized cost and fair value of AFS securities by contractual maturity: At December 31, 2022 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 204,757 $ 198,765 After 1 year through 5 years 1,200,088 1,127,769 After 5 years through 10 years 1,459,962 1,351,397 After 10 years 5,892,348 5,214,766 Total AFS securities $ 8,757,155 $ 7,892,697 The following table summarizes the amortized cost and fair value of HTM securities by contractual maturity: At December 31, 2022 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 2,195 $ 2,194 After 1 year through 5 years 53,632 54,275 After 5 years through 10 years 329,156 312,741 After 10 years 6,179,896 5,392,243 Total HTM securities $ 6,564,879 $ 5,761,453
Debt Securities, Available-for-Sale	The following table summarizes AFS securities pledged for deposits, borrowings, and other purposes: At December 31, (In thousands) 2022 2021 AFS securities pledged for deposits, at fair value $ 2,573,072 $ 855,323 AFS securities pledged for borrowings and other, at fair value 1,195,101 924,841 Total AFS securities pledged $ 3,768,173 $ 1,780,164
Debt Securities, Held-to-maturity, Credit Quality Indicator	The following table summarizes the amortized cost basis of HTM securities based on their lowest publicly available credit rating: At December 31, 2022 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 Baa2 Not Rated Agency CMOs $ — $ 28,358 $ — $ — $ — $ — $ — $ — Agency MBS — 2,626,114 — — — — — — Agency CMBS — 2,831,949 — — — — — — Municipal bonds and notes 336,035 163,312 255,235 116,870 38,177 4,165 — 15,051 CMBS 149,613 — — — — — — — Total HTM securities $ 485,648 $ 5,649,733 $ 255,235 $ 116,870 $ 38,177 $ 4,165 $ — $ 15,051 At December 31, 2021 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 Baa2 Not Rated Agency CMOs $ — $ 42,405 $ — $ — $ — $ — $ — $ — Agency MBS — 2,901,593 — — — — — — Agency CMBS — 2,378,475 — — — — — — Municipal bonds and notes 207,426 119,804 227,106 104,232 35,878 8,260 95 3,117 CMBS 169,948 — — — — — — — Total HTM securities $ 377,374 $ 5,442,277 $ 227,106 $ 104,232 $ 35,878 $ 8,260 $ 95 $ 3,117
Schedule of Realized Gain (Loss)	The following table summarizes information from sales of AFS securities: Years ended December 31, (In thousands) 2022 2021 2020 Proceeds from sales $ 172,947 $ — $ 8,963 Gross realized gains $ — $ — $ 8 Gross realized losses 6,751 — — (Loss) gain on sale of investment securities, net $ (6,751) $ — $ 8

Loans and Leases (Tables)

Loans and Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases by Portfolio Segment and Class	The following table summarizes loans and leases by portfolio segment and class: At December 31, (In thousands) 2022 2021 Commercial non-mortgage $ 16,392,795 $ 6,882,480 Asset-based 1,821,642 1,067,248 Commercial real estate 12,997,163 5,463,321 Multi-family 6,621,982 1,139,859 Equipment financing 1,628,393 627,058 Warehouse lending 641,976 — Commercial portfolio 40,103,951 15,179,966 Residential 7,963,420 5,412,905 Home equity 1,633,107 1,593,559 Other consumer 63,948 85,299 Consumer portfolio 9,660,475 7,091,763 Loans and leases $ 49,764,426 $ 22,271,729
Past Due Financing Receivables	Non-Accrual and Past Due Loans and Leases The following tables summarize the aging of accrual and non-accrual loans and leases by class: At December 31, 2022 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Current (1) Total Loans Commercial non-mortgage $ 8,434 $ 821 $ 645 $ 71,884 $ 81,784 $ 16,311,011 $ 16,392,795 Asset-based 5,921 — — 20,024 25,945 1,795,697 1,821,642 Commercial real estate 1,494 23,492 68 39,057 64,111 12,933,052 12,997,163 Multi-family 1,157 — — 636 1,793 6,620,189 6,621,982 Equipment financing 806 9,988 — 12,344 23,138 1,605,255 1,628,393 Warehouse lending — — — — — 641,976 641,976 Commercial portfolio 17,812 34,301 713 143,945 196,771 39,907,180 40,103,951 Residential 8,246 3,083 — 25,424 36,753 7,926,667 7,963,420 Home equity 5,293 2,820 — 27,924 36,037 1,597,070 1,633,107 Other consumer 1,028 85 13 148 1,274 62,674 63,948 Consumer portfolio 14,567 5,988 13 53,496 74,064 9,586,411 9,660,475 Total $ 32,379 $ 40,289 $ 726 $ 197,441 $ 270,835 $ 49,493,591 $ 49,764,426 (1) At December 31, 2022, there were $28.5 million of commercial loans that had reached their contractual maturity but were actively in the process of being refinanced with the Company. Due to the status of the refinancing, these commercial loans have been reported as current in the table above. In January 2023, $26.8 million were approved and refinanced. At December 31, 2021 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Current Total Loans Commercial non-mortgage $ 3,729 $ 4,524 $ 1,977 $ 59,607 $ 69,837 $ 6,812,643 $ 6,882,480 Asset-based — — — 2,086 2,086 1,065,162 1,067,248 Commercial real estate 508 417 519 5,046 6,490 5,456,831 5,463,321 Multi-family — — — — — 1,139,859 1,139,859 Equipment financing 1,034 — — 3,728 4,762 622,296 627,058 Commercial portfolio 5,271 4,941 2,496 70,467 83,175 15,096,791 15,179,966 Residential 3,212 368 — 15,747 19,327 5,393,578 5,412,905 Home equity 3,467 1,600 — 23,489 28,556 1,565,003 1,593,559 Other consumer 379 181 — 224 784 84,515 85,299 Consumer portfolio 7,058 2,149 — 39,460 48,667 7,043,096 7,091,763 Total $ 12,329 $ 7,090 $ 2,496 $ 109,927 $ 131,842 $ 22,139,887 $ 22,271,729 The following table provides additional information on non-accrual loans and leases: At December 31, 2022 2021 (In thousands) Non-accrual Non-accrual With No Allowance Non-accrual Non-accrual With No Allowance Commercial non-mortgage $ 71,884 $ 12,598 $ 59,607 $ 4,802 Asset-based 20,024 1,491 2,086 2,086 Commercial real estate 39,057 90 5,046 4,310 Multi-family 636 — — — Equipment financing 12,344 2,240 3,728 — Commercial portfolio 143,945 16,419 70,467 11,198 Residential 25,424 10,442 15,747 10,584 Home equity 27,924 15,193 23,489 18,920 Other consumer 148 5 224 2 Consumer portfolio 53,496 25,640 39,460 29,506 Total $ 197,441 $ 42,059 $ 109,927 $ 40,704
Activity In Allowance For Losses	Allowance for Credit Losses on Loans and Leases The following tables summarize the change in the ACL on loans and leases by portfolio segment: At or for the Years ended December 31, 2022 2021 2020 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 257,877 $ 43,310 $ 301,187 $ 312,244 $ 47,187 $ 359,431 $ 161,669 $ 47,427 $ 209,096 Initial allowance for PCD loans and leases (1) 78,376 9,669 88,045 — — — — — — Adoption of CECL — — — — — — 34,024 23,544 57,568 Provision (benefit) 268,295 4,502 272,797 (48,651) (5,764) (54,415) 156,336 (18,488) 137,848 Charge-offs (82,860) (4,662) (87,522) (9,437) (9,217) (18,654) (42,925) (12,408) (55,333) Recoveries 11,437 8,797 20,234 3,721 11,104 14,825 3,140 7,112 10,252 Balance, end of period $ 533,125 $ 61,616 $ 594,741 $ 257,877 $ 43,310 $ 301,187 $ 312,244 $ 47,187 $ 359,431 Individually assessed for credit losses 34,793 12,441 47,234 16,965 4,108 21,073 11,687 4,450 16,137 Collectively assessed for credit losses $ 498,332 $ 49,175 $ 547,507 $ 240,912 $ 39,202 $ 280,114 $ 300,557 $ 42,737 $ 343,294 (1) Represents the establishment of the initial reserve for PCD loans and leases, which is reported net of $48.3 million of day one charge-offs recognized at the date of acquisition in accordance with GAAP.
Financing Receivable Credit Quality Indicators	The following tables summarize the amortized cost basis of commercial loans and leases by Composite Credit Risk Profile grade and origination year: At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 5,154,781 $ 1,952,158 $ 965,975 $ 792,977 $ 593,460 $ 780,200 $ 5,670,532 $ 15,910,083 Special mention 104,277 15,598 21,168 263 14,370 7,770 40,142 203,588 Substandard 28,203 11,704 69,954 36,604 70,634 16,852 41,917 275,868 Doubtful — — — 1 — — 3,255 3,256 Commercial non-mortgage 5,287,261 1,979,460 1,057,097 829,845 678,464 804,822 5,755,846 16,392,795 Asset-based: Pass 19,659 3,901 9,424 14,413 5,163 55,553 1,551,250 1,659,363 Special mention — — — — — — 80,476 80,476 Substandard — — — 1,491 — — 80,312 81,803 Asset-based 19,659 3,901 9,424 15,904 5,163 55,553 1,712,038 1,821,642 Commercial real estate: Pass 3,420,635 2,246,672 1,556,185 1,605,869 1,058,730 2,681,052 97,832 12,666,975 Special mention 21,878 8,995 7,264 37,570 47,419 66,652 1,000 190,778 Substandard 519 2,459 216 31,163 47,021 57,997 — 139,375 Doubtful — — — 1 — 34 — 35 Commercial real estate 3,443,032 2,258,126 1,563,665 1,674,603 1,153,170 2,805,735 98,832 12,997,163 Multi-family: Pass 1,992,980 1,057,705 507,065 694,066 444,564 1,748,337 51,655 6,496,372 Special mention 37,677 — — 95 40,307 726 8,838 87,643 Substandard — — 382 — 12,681 24,904 — 37,967 Multi-family 2,030,657 1,057,705 507,447 694,161 497,552 1,773,967 60,493 6,621,982 Equipment financing: Pass 388,641 345,792 331,419 308,441 98,874 83,264 — 1,556,431 Special mention — 185 — 11,965 6,775 25 — 18,950 Substandard 314 16,711 18,436 5,016 5,307 7,228 — 53,012 Equipment financing 388,955 362,688 349,855 325,422 110,956 90,517 — 1,628,393 Warehouse lending: Pass — — — — — — 641,976 641,976 Warehouse lending — — — — — — 641,976 641,976 Commercial portfolio $ 11,169,564 $ 5,661,880 $ 3,487,488 $ 3,539,935 $ 2,445,305 $ 5,530,594 $ 8,269,185 $ 40,103,951 At December 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 2,270,320 $ 1,179,620 $ 757,343 $ 581,633 $ 292,637 $ 275,789 $ 1,182,562 $ 6,539,904 Special mention 14,216 22,892 37,877 15,575 9,721 15,399 27,808 143,488 Substandard 3,660 46,887 30,437 69,963 5,255 19,483 23,403 199,088 Commercial non-mortgage 2,288,196 1,249,399 825,657 667,171 307,613 310,671 1,233,773 6,882,480 Asset-based: Pass 7,609 19,141 12,810 13,456 6,113 25,850 920,496 1,005,475 Special mention — — — 675 — — 59,012 59,687 Substandard — — 2,086 — — — — 2,086 Asset-based 7,609 19,141 14,896 14,131 6,113 25,850 979,508 1,067,248 Commercial real estate: Pass 1,152,431 733,220 1,146,149 594,180 384,664 1,136,384 55,044 5,202,072 Special mention 95 3,084 — 84,475 51,536 79,096 — 218,286 Substandard — 82 227 373 13,874 28,407 — 42,963 Commercial real estate 1,152,526 736,386 1,146,376 679,028 450,074 1,243,887 55,044 5,463,321 Multi-family: Pass 222,875 135,924 185,087 322,688 17,054 203,558 566 1,087,752 Special mention — — — 35,201 — — — 35,201 Substandard — 400 — 6,933 — 9,573 — 16,906 Multi-family 222,875 136,324 185,087 364,822 17,054 213,131 566 1,139,859 Equipment financing: Pass 231,762 188,031 93,547 41,276 14,864 32,588 — 602,068 Special mention — 108 2,229 3,341 — 600 — 6,278 Substandard — 8,388 4,756 2,612 332 2,624 — 18,712 Equipment financing 231,762 196,527 100,532 47,229 15,196 35,812 — 627,058 Commercial portfolio $ 3,902,968 $ 2,337,777 $ 2,272,548 $ 1,772,381 $ 796,050 $ 1,829,351 $ 2,268,891 $ 15,179,966 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 and a higher FICO score is indicative of lower credit risk. FICO scores are updated at least on a quarterly basis. The following tables summarize the amortized cost basis of consumer loans by FICO score and origination year: At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Residential: 800+ $ 527,408 $ 954,568 $ 469,518 $ 160,596 $ 28,361 $ 997,409 $ — $ 3,137,860 740-799 963,026 946,339 311,295 111,913 43,684 689,771 — 3,066,028 670-739 381,515 350,671 103,999 62,365 18,451 384,687 — 1,301,688 580-669 40,959 49,648 14,484 5,836 2,357 138,107 — 251,391 579 and below 52,464 3,693 2,057 84,032 1,299 62,908 — 206,453 Residential 1,965,372 2,304,919 901,353 424,742 94,152 2,272,882 — 7,963,420 Home equity: 800+ 25,475 35,129 25,612 7,578 12,545 55,352 465,318 627,009 740-799 26,743 35,178 17,621 8,111 7,765 32,270 398,692 526,380 670-739 18,396 16,679 8,175 3,635 7,614 30,060 259,646 344,205 580-669 2,848 3,068 1,520 1,456 1,163 13,607 76,614 100,276 579 and below 426 386 651 661 563 4,736 27,814 35,237 Home equity 73,888 90,440 53,579 21,441 29,650 136,025 1,228,084 1,633,107 Other consumer: 800+ 495 218 544 1,045 247 56 19,196 21,801 740-799 888 2,624 1,959 2,494 941 364 12,218 21,488 670-739 977 603 2,480 4,238 1,041 118 6,107 15,564 580-669 211 117 337 801 173 54 2,223 3,916 579 and below 169 101 29 116 36 21 707 1,179 Other consumer 2,740 3,663 5,349 8,694 2,438 613 40,451 63,948 Consumer portfolio 2,042,000 2,399,022 960,281 454,877 126,240 2,409,520 1,268,535 9,660,475 At December 31, 2021 (In thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Total Residential: 800+ $ 590,238 $ 428,118 $ 161,664 $ 35,502 $ 105,198 $ 735,517 $ — $ 2,056,237 740-799 1,083,608 421,380 154,960 32,172 95,662 456,722 — 2,244,504 670-739 374,460 135,146 73,499 25,099 34,550 227,863 — 870,617 580-669 38,644 13,782 9,348 3,056 9,000 71,811 — 145,641 579 and below 9,478 1,051 49,252 390 2,519 33,216 — 95,906 Residential 2,096,428 999,477 448,723 96,219 246,929 1,525,129 — 5,412,905 Home equity: 800+ 35,678 30,157 9,591 16,347 11,068 58,189 463,334 624,364 740-799 42,430 22,030 9,413 13,317 7,711 33,777 409,518 538,196 670-739 17,493 9,162 5,889 8,220 5,802 31,160 233,744 311,470 580-669 1,773 1,397 1,298 1,066 1,329 15,042 66,361 88,266 579 and below 380 446 725 1,060 434 5,666 22,552 31,263 Home equity 97,754 63,192 26,916 40,010 26,344 143,834 1,195,509 1,593,559 Other consumer: 800+ 463 1,343 2,398 916 231 118 10,160 15,629 740-799 2,588 5,408 8,303 2,985 379 77 9,528 29,268 670-739 1,061 7,034 13,602 3,859 607 412 5,644 32,219 580-669 256 1,083 2,550 735 216 211 1,267 6,318 579 and below 147 87 215 159 40 21 1,196 1,865 Other consumer 4,515 14,955 27,068 8,654 1,473 839 27,795 85,299 Consumer portfolio 2,198,697 1,077,624 502,707 144,883 274,746 1,669,802 1,223,304 7,091,763
Troubled Debt Restructurings on Financing Receivables	Troubled Debt Restructurings The following table summarizes information related to TDRs: At December 31, (In thousands) 2022 2021 Accrual status $ 110,868 $ 110,625 Non-accrual status 83,954 52,719 Total TDRs $ 194,822 $ 163,344 Additional funds committed to borrowers in TDR status $ 1,724 $ 5,975 Specific reserves for TDRs included in the ACL on loans and leases: Commercial portfolio $ 14,578 $ 9,017 Consumer portfolio 3,559 3,745 During the years ended December 31, 2022, 2021, and 2020, the portion of TDRs deemed to be uncollectible and charged-off totaled $14.7 million, $3.0 million, $17.6 million for the commercial portfolio, respectively, and $0.3 million, $0.4 million, and $0.8 million for the consumer portfolio, respectively. The following table summarizes loans and leases modified as TDRs by class and modification type: Years ended December 31, 2022 2021 2020 Number of Recorded Investment (1) Number of Recorded Investment (1) Number of Recorded Investment (1) (Dollars in thousands) Commercial non-mortgage: Extended maturity 5 $ 291 8 $ 605 11 $ 1,070 Adjusted interest rate — — — — 1 96 Maturity / rate combined 8 765 9 352 7 607 Other (2) 19 52,070 12 14,160 24 40,128 Asset-based: Other (2) 1 23,298 — — — — Commercial real estate: Extended maturity — — 1 183 1 72 Maturity / rate combined — — — — 2 377 Other (2) — — 1 1,582 3 306 Equipment financing: Other (2) 3 1,692 — — — — Residential: Extended maturity 2 1,185 1 99 3 485 Maturity / rate combined 2 133 2 401 10 1,133 Other (2) 8 3,158 3 280 26 4,215 Home equity: Extended maturity — — 85 1,809 3 188 Adjusted interest rate 1 74 — — — — Maturity / rate combined 21 2,623 6 1,025 5 334 Other (2) 37 2,134 22 1,481 96 6,680 Total TDRs 107 $ 87,423 150 $ 21,977 192 $ 55,691 (1) Post-modification balances approximate pre-modification balances. The aggregate amount of charge-offs due to restructurings was not significant. (2) Other includes covenant modifications, forbearance, discharges under Chapter 7 bankruptcy, or other concessions.

Transfers of Financial Assets (

Transfers of Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Transfers and Servicing [Abstract]
Schedule of Loan Sale Activity [Table Text Block]	The following table summarizes information related to mortgage banking activities: Years ended December 31, (In thousands) 2022 2021 2020 Net gain on sale $ 580 $ 5,192 $ 15,305 Origination fees 219 1,440 3,230 Fair value adjustments (94) (413) (240) Mortgage banking activities $ 705 $ 6,219 $ 18,295 Proceeds from sale $ 36,335 $ 247,634 $ 486,341 Loans sold with servicing rights retained 32,056 237,834 464,736
Servicing Asset at Amortized Cost	The following table presents the change in the carrying amount for mortgage servicing rights: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 9,237 $ 13,422 $ 17,484 Acquired from Sterling 859 — — Additions 289 2,053 4,373 Amortization (1) (870) (5,593) (6,562) Adjustment to valuation allowance — (645) (1,873) Balance, end of period $ 9,515 $ 9,237 $ 13,422 (1) During the year ended December 31, 2022, the Company implemented a change in the method of amortization applied to its mortgage servicing rights to better reflect the pattern of consumption, where estimated future cash flows are now assessed at the individual loan level as opposed to on a pooled basis.

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property and equipment is carried at cost, less accumulated depreciation and amortization. Depreciation and amortization is computed on a straight-line basis over the estimated useful lives of the assets, as illustrated in the following table. If shorter, leasehold improvements are amortized over the terms of the respective leases. Minimum Maximum Building and improvements 5 - 40 years Leasehold improvements 5 - 20 years Furniture, fixtures, and equipment 5 - 10 years Data processing equipment and software 3 - 7 years The following table summarizes the components of premises and equipment: At December 31, (In thousands) 2022 2021 Land $ 73,916 $ 9,436 Buildings and improvements 106,180 67,501 Leasehold improvements 84,477 65,606 Furniture, fixtures, and equipment 71,542 64,890 Data processing equipment and software 128,153 105,516 Property and equipment 464,268 312,949 Less: Accumulated depreciation and amortization (225,152) (228,318) Property and equipment, net 239,116 84,631 ROU lease assets, net 191,068 119,926 Premises and equipment, net $ 430,184 $ 204,557
Disclosure of Long Lived Assets Held-for-sale	The following table summarizes the activity in assets held for disposition: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 490 $ 2,654 $ — Transfers from (to) property and equipment 4,800 (38) 2,654 Write-downs (190) — — Sales (300) (2,126) — Balance, end of period $ 4,800 $ 490 $ 2,654

Leasing (Tables)

Leasing (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Summary of Net Investments	The following table summarizes the components of the Company's net investment in its sales-type and direct financing leases: At December 31, (In thousands) 2022 2021 Lease receivables $ 330,690 $ 196,632 Unguaranteed residual values 100,368 19,748 Total net investment $ 431,058 $ 216,380
Summary of Net Investment Maturity	The following table reconciles undiscounted future lease payments to the total sales-type and direct financing leases' net investment: (In thousands) At December 31, 2022 2023 $ 146,858 2024 91,592 2025 74,522 2026 71,950 2027 27,029 Thereafter 56,598 Total lease payments receivable 468,549 Present value adjustment (37,491) Total net investment $ 431,058
Schedule of Components of Leveraged Lease Investments	The following table summarizes the Company's ROU lease assets and operating lease liabilities: At December 31, (In thousands) Consolidated Balance Sheet Line Item 2022 2021 ROU lease assets Premises and equipment, net $ 191,068 $ 119,926 Operating lease liabilities Accrued expenses and other liabilities 239,281 144,804
Lease, Cost	The following table summarizes the components of operating lease expense and other relevant information: At or for the Years ended December 31, (In thousands) 2022 2021 2020 Lease Cost: Operating and variable lease costs $ 44,654 $ 30,936 $ 35,916 Sublease income (1,383) (554) (557) Total operating lease expense $ 43,271 $ 30,382 $ 35,359 Other Information: Cash paid for amounts included in the measurement of operating lease liabilities $ 44,767 $ 30,487 $ 31,212 ROU lease assets obtained in exchange for operating lease liabilities (1) 27,897 15,226 9,211 Weighted-average remaining lease term (in years) 7.72 7.50 8.04 Weighted-average discount rate 2.65 % 3.04 % 3.19 % (1) Excludes ROU lease assets acquired from Sterling in the merger.
Lessee, Operating Lease, Liability, Maturity	The following table reconciles undiscounted future lease payments to total operating lease liabilities: (In thousands) At December 31, 2022 2023 $ 40,614 2024 40,808 2025 36,274 2026 32,696 2027 27,201 Thereafter 91,369 Total operating lease payments 268,962 Present value adjustment (29,681) Total operating lease liabilities $ 239,281

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table summarizes changes in the carrying amount of goodwill: At December 31, (In thousands) 2022 2021 Balance, beginning of period $ 538,373 $ 538,373 Sterling merger 1,939,765 — Bend acquisition 35,966 — Balance, end of period $ 2,514,104 $ 538,373
Schedule of Finite-Lived Intangible Assets	The following table summarizes other intangible assets: At December 31, 2022 2021 (In thousands) Gross Carrying Amount (1) Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposits $ 146,037 $ 36,710 $ 109,327 $ 26,625 $ 18,516 $ 8,109 Customer relationships 115,000 24,985 90,015 21,000 11,240 9,760 Other intangible assets $ 261,037 $ 61,695 $ 199,342 $ 47,625 $ 29,756 $ 17,869 (1) The increase in the gross carrying amount of other intangible assets is primarily attributed to the merger with Sterling and acquisition of Bend, in which the Company recorded a combined $119.1 million in core deposits and $94.0 million of customer relationships. These other intangible assets are being amortized on an accelerated basis over a period of 10 years.
Schedule Of Expected Amortization Expense, Next Four Years	is as follows: (In thousands) At December 31, 2023 $ 30,362 2024 24,481 2025 21,487 2026 21,487 2027 21,487 Thereafter 80,038

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Income tax expense reflects the following expense (benefit) components: Years ended December 31, (In thousands) 2022 2021 2020 Current: Federal $ 170,779 $ 109,621 $ 73,172 State and local 52,579 20,374 17,417 Total current 223,358 129,995 90,589 Deferred: Federal (45,421) (9,844) (23,799) State and local (24,243) 4,846 (7,437) Total deferred (69,664) (4,998) (31,236) Total federal 125,358 99,777 49,373 Total state and local 28,336 25,220 9,980 Income tax expense $ 153,694 $ 124,997 $ 59,353
Schedule of Effective Income Tax Rate Reconciliation	The following table reflects a reconciliation of reported income tax expense to the amount that would result from applying the federal statutory rate of 21.0%: Years ended December 31, 2022 2021 2020 (In thousands) Amount Percent Amount Percent Amount Percent Income tax expense at federal statutory rate $ 167,575 21.0 % $ 112,111 21.0 % $ 58,795 21.0 % Reconciliation to reported income tax expense: SALT expense, net of federal 32,259 4.1 19,924 3.7 7,884 2.8 Tax-exempt interest income, net (35,371) (4.4) (6,814) (1.3) (7,181) (2.6) Increase in cash surrender value of life insurance (6,122) (0.8) (3,030) (0.6) (3,058) (1.1) Non-deductible FDIC Deposit insurance premiums 5,581 0.7 2,064 0.4 2,172 0.8 Low income housing tax credits and other benefits, net (7,627) (1.0) (615) (0.1) (289) (0.1) Non-deductible compensation expense 7,948 1.0 786 0.1 454 0.2 Non-deductible merger-related expenses, excluding compensation 2,717 0.3 3,451 0.7 — — SALT DTA valuation allowance adjustment, net (9,874) (1.2) — — — — Other, net (3,392) (0.4) (2,880) (0.5) 576 0.2 Income tax expense and effective tax rate $ 153,694 19.3 % $ 124,997 23.4 % $ 59,353 21.2 %
Schedule of Deferred Tax Assets and Liabilities	The following table reflects the significant components of the DTAs, net: At December 31, (In thousands) 2022 2021 Deferred tax assets: ACL on loans and leases $ 161,932 $ 78,905 Net operating loss and credit carry forwards 72,035 64,366 Compensation and employee benefit plans 55,093 22,840 Lease liabilities under operating leases 64,899 38,130 Net unrealized loss on AFS securities 233,978 — Other 38,314 12,790 Gross deferred tax assets 626,251 217,031 Valuation allowance (29,176) (37,374) Total deferred tax assets, net of valuation allowance $ 597,075 $ 179,657 Deferred tax liabilities: Net unrealized gain on AFS securities $ — $ 1,885 ROU assets under operating leases 51,822 31,580 Equipment financing leases 74,295 21,193 Goodwill and other intangible assets 56,223 5,690 Purchase accounting and fair value adjustments 11,529 — Other 31,572 9,904 Gross deferred tax liabilities 225,441 70,252 Deferred tax assets, net $ 371,634 $ 109,405
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible	The following table reflects a reconciliation of the beginning and ending balances of UTBs: Years ended December 31, (In thousands) 2022 2021 2020 Beginning balance $ 4,249 $ 4,252 $ 4,813 Additions as a result of tax positions taken during the current year 223 294 87 Additions as a result of tax positions taken during prior years 8,807 434 572 Reductions as a result of tax positions taken during prior years (503) (186) (694) Reductions relating to settlements with taxing authorities (2,110) (267) (130) Reductions as a result of lapse of statute of limitation periods (791) (278) (396) Ending balance $ 9,875 $ 4,249 $ 4,252

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2022
Deposit Liabilities [Abstract]
Deposit Liabilities, Type [Table Text Block]	The following table summarizes deposits by type: At December 31, (In thousands) 2022 2021 Non-interest-bearing: Demand $ 12,974,975 $ 7,060,488 Interest-bearing: Health savings accounts 7,944,892 7,397,582 Checking 9,237,529 4,182,497 Money market 11,062,652 3,718,953 Savings 8,673,343 5,689,739 Time deposits 4,160,949 1,797,770 Total interest-bearing 41,079,365 22,786,541 Total deposits $ 54,054,340 $ 29,847,029 Time deposits, money market, and interest-bearing checking obtained through brokers $ 1,964,873 $ 120,392 Aggregate amount of time deposit accounts that exceeded the FDIC limit 1,894,950 256,522 Demand deposit overdrafts reclassified as loan balances 8,721 1,577
Time Deposit Maturities [Table Text Block]	The following table summarizes the scheduled maturities of time deposits: (In thousands) At December 31, 2022 2023 $ 3,754,386 2024 181,790 2025 129,775 2026 55,102 2027 39,896 Thereafter — Total time deposits $ 4,160,949

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The following table summarizes securities sold under agreements to repurchase and other borrowings: At December 31, 2022 2021 (In thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) : Original maturity of one year or less $ 282,005 0.11 % $ 474,896 0.11 % Original maturity of greater than one year, non-callable (2) — — 200,000 1.32 Total securities sold under agreements to repurchase (1) 282,005 0.11 674,896 0.47 Federal funds purchased 869,825 4.44 — — Securities sold under agreements to repurchase and other borrowings $ 1,151,830 3.38 % $ 674,896 0.47 % (1) The Company has the 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. (2) During the year ended December 31, 2022, the Company and its repurchase agreement counterparty agreed to fully extinguish Securities sold under agreements to repurchase are used as a source of borrowed funds and are collateralized by Agency MBS and Corporate debt. The Company's repurchase agreement counterparties are limited to primary dealers in government securities, and commercial and municipal customers through the Corporate Treasury function. The Company may also purchase unsecured term and overnight federal funds to satisfy its short-term liquidity needs.
Federal Home Loan Bank, Advances	The following table summarizes information for FHLB advances: At December 31, 2022 2021 (In thousands) Total Weighted-Average Contractual Coupon Rate Total Weighted-Average Contractual Coupon Rate Maturing within 1 year $ 5,450,187 4.40 % $ 90 — % After 1 but within 2 years — — 202 2.95 After 2 but within 3 years — — — — After 3 but within 4 years — — — — After 4 but within 5 years 252 — — — After 5 years 10,113 2.09 10,705 2.03 FHLB advances $ 5,460,552 4.39 % $ 10,997 2.03 % Aggregate carrying value of assets pledged as collateral $ 13,692,379 $ 7,556,034 Remaining borrowing capacity at FHLB 4,291,326 5,087,294 The Bank may borrow up to the amount of eligible mortgages and securities that have been pledged as collateral to secure FHLB advances, which includes certain residential and commercial real estate loans, home equity lines of credit, MBS and Agency CLO. The Bank was in compliance with its FHLB collateral requirements at both December 31, 2022, and 2021.
Schedule of Long-Term Debt	The following table summarizes long-term debt: At December 31, (In thousands) 2022 2021 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) 333,458 338,811 4.000% Subordinated fixed-to-floating rate notes due December 30, 2029 274,000 — 3.875 % Subordinated fixed-to-floating rate notes due November 1, 2030 225,000 — Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (2) 77,320 77,320 Total senior and subordinated debt 1,059,778 566,131 Discount on senior fixed-rate notes (756) (974) Debt issuance cost on senior fixed-rate notes (1,824) (2,226) Premium on subordinated fixed-to-floating rate notes 15,930 — Long-term debt $ 1,073,128 $ 562,931 (1) The Company de-designated its fair value hedging relationship on these senior notes in 2020. A basis adjustment of $33.5 million and $38.8 million at December 31, 2022, and 2021, respectively, is included in the carrying value and is being amortized over the remaining life of the senior notes. (2) The interest rate on the Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 7.69% and 3.17% at December 31, 2022, and 2021, respectively.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule of Stock by Class	The following table summarizes the changes in shares of preferred and common stock issued and common stock held as treasury shares for the year ended December 31, 2022: Preferred Stock Series F Issued Preferred Stock Series G Issued Common Stock Issued (1) Treasury Stock Held Common Stock Outstanding Balance, beginning of period 6,000 — 93,686,311 3,102,690 90,583,621 Issued in business combination — 135,000 89,091,734 — 89,091,734 Contribution to charitable foundation — — — (242,270) 242,270 Employee stock compensation plan activity — — — (458,881) 458,881 Stock options exercised — — — (30,355) 30,355 Common stock repurchase program — — 6,399,288 (6,399,288) Balance, end of period 6,000 135,000 182,778,045 8,770,472 174,007,573 (1) In accordance with the merger agreement, 87,965,239 shares were issued as consideration for outstanding Sterling common stock, and 1,126,495 shares were issued to replace Sterling equity awards. Additional information regarding the determination of the purchase price consideration for the Sterling merger can be found within Note 2: Mergers and Acquisitions.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss, Net of Tax (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule of Other Comprehensive Income (Loss)	The following table summarizes the changes in each component of accumulated other comprehensive (loss) income, net of tax: (In thousands) Investment Securities Available- Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance at December 31, 2019 $ 17,251 $ (9,184) $ (44,139) $ (36,072) Other comprehensive income (loss) before reclassifications 50,179 20,667 (3,887) 66,959 Amounts reclassified from accumulated other comprehensive (6) 8,435 2,940 11,369 Other comprehensive income (loss), net of tax 50,173 29,102 (947) 78,328 Balance at December 31, 2020 67,424 19,918 (45,086) 42,256 Other comprehensive (loss) income before reclassifications (62,888) (17,109) 8,876 (71,121) Amounts reclassified from accumulated other comprehensive — 3,261 3,024 6,285 Other comprehensive (loss) income, net of tax (62,888) (13,848) 11,900 (64,836) Balance at December 31, 2021 4,536 6,070 (33,186) (22,580) Other comprehensive (loss) before reclassifications (640,656) (17,810) (13,350) (671,816) Amounts reclassified from accumulated other comprehensive 4,960 2,866 1,610 9,436 Other comprehensive (loss), net of tax (635,696) (14,944) (11,740) (662,380) Balance at December 31, 2022 $ (631,160) $ (8,874) $ (44,926) $ (684,960)
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table further summarizes the amounts reclassified from accumulated other comprehensive (loss) income: Years ended December 31, Accumulated Other Comprehensive Income (Loss) Components 2022 2021 2020 Associated Line Item in the Consolidated Statement Of Income (In thousands) Investment securities available-for-sale: Net unrealized holding (losses) gains $ (6,751) $ — $ 8 (Loss) gain on sale of investment securities, net Tax benefit (expense) 1,791 — (2) Income tax expense Net of tax $ (4,960) $ — $ 6 Derivative instruments: Hedge terminations $ (306) $ (306) $ (7,884) Interest expense Premium amortization (3,626) (4,109) (3,536) Interest income Tax benefit 1,066 1,154 2,985 Income tax expense Net of tax $ (2,866) $ (3,261) $ (8,435) Defined benefit pension and other postretirement benefit plans: Actuarial net loss amortization $ (2,210) $ (4,102) $ (3,976) Other non-interest expense Tax benefit 600 1,078 1,036 Income tax expense Net of tax $ (1,610) $ (3,024) $ (2,940) The following tables summarize each component of other comprehensive (loss) income and the related tax effects: Year ended December 31, 2022 (In thousands) Amount Tax Benefit (Expense) Amount Investment securities available-for-sale: Net unrealized holding (losses) arising during the year $ (878,366) $ 237,710 $ (640,656) Reclassification adjustment for net realized losses included in net income 6,751 (1,791) 4,960 Total investment securities available-for-sale (871,615) 235,919 (635,696) Derivative instruments: Net unrealized (losses) arising during the year (24,440) 6,630 (17,810) Reclassification adjustment for net realized losses included in net income 3,932 (1,066) 2,866 Total derivative instruments (20,508) 5,564 (14,944) Defined benefit pension and other postretirement benefit plans: Net actuarial (loss) arising during the year (18,319) 4,969 (13,350) Reclassification adjustment for net actuarial loss amortization included in net income 2,210 (600) 1,610 Total defined benefit pension and postretirement benefit plans (16,109) 4,369 (11,740) Other comprehensive (loss), net of tax $ (908,232) $ 245,852 $ (662,380) Year ended December 31, 2021 (In thousands) Amount Tax Benefit (Expense) Amount Investment securities available-for-sale: Net unrealized holding (losses) arising during the year $ (85,368) $ 22,480 $ (62,888) Total investment securities available-for-sale (85,368) 22,480 (62,888) Derivative instruments: Net unrealized (losses) arising during the year (23,216) 6,107 (17,109) Reclassification adjustment for net realized losses included in net income 4,415 (1,154) 3,261 Total derivative instruments (18,801) 4,953 (13,848) Defined benefit pension and other postretirement benefit plans: Net actuarial gain arising during the year 12,052 (3,176) 8,876 Reclassification adjustment for net actuarial loss amortization included in net income 4,102 (1,078) 3,024 Total defined benefit pension and postretirement benefit plans 16,154 (4,254) 11,900 Other comprehensive (loss), net of tax $ (88,015) $ 23,179 $ (64,836) Year ended December 31, 2020 (In thousands) Amount Tax Benefit (Expense) Amount Investment securities available-for-sale: Net unrealized holding gains arising during the year $ 68,116 $ (17,937) $ 50,179 Reclassification adjustment for net realized gains included in net income (8) 2 (6) Total investment securities available-for-sale 68,108 (17,935) 50,173 Derivative instruments: Net unrealized gains arising during the year 27,683 (7,016) 20,667 Reclassification adjustment for net realized losses included in net income 11,420 (2,985) 8,435 Total derivative instruments 39,103 (10,001) 29,102 Defined benefit pension and other postretirement benefit plans: Net actuarial (loss) arising during the year (5,262) 1,375 (3,887) Reclassification adjustment for net actuarial loss amortization included in net income 3,976 (1,036) 2,940 Total defined benefit pension and postretirement benefit plans (1,286) 339 (947) Other comprehensive income, net of tax $ 105,925 $ (27,597) $ 78,328

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Information On The Capital Ratios	The following table provides information on the regulatory capital ratios for the Holding Company and the Bank: At December 31, 2022 Actual (1) Minimum Requirement Well Capitalized (In thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 5,822,369 10.71 % $ 2,446,344 4.5 % $ 3,533,608 6.5 % Total risk-based capital 7,203,029 13.25 4,349,056 8.0 5,436,320 10.0 Tier 1 risk-based capital 6,106,348 11.23 3,261,792 6.0 4,349,056 8.0 Tier 1 leverage capital 6,106,348 8.95 2,730,212 4.0 3,412,765 5.0 Webster Bank CET1 risk-based capital $ 6,661,504 12.28 % $ 2,442,058 4.5 % $ 3,527,417 6.5 % Total risk-based capital 7,165,935 13.20 4,341,437 8.0 5,426,796 10.0 Tier 1 risk-based capital 6,661,504 12.28 3,256,078 6.0 4,341,437 8.0 Tier 1 leverage capital 6,661,504 9.77 2,727,476 4.0 3,409,345 5.0 At December 31, 2021 Actual (1) Minimum Requirement Well Capitalized (In thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 2,804,290 11.72 % $ 1,076,871 4.5 % $ 1,555,480 6.5 % Total risk-based capital 3,265,064 13.64 1,914,436 8.0 2,393,046 10.0 Tier 1 risk-based capital 2,949,327 12.32 1,435,827 6.0 1,914,436 8.0 Tier 1 leverage capital 2,949,327 8.47 1,393,607 4.0 1,742,008 5.0 Webster Bank CET1 risk-based capital $ 3,034,883 12.69 % $ 1,075,920 4.5 % $ 1,554,107 6.5 % Total risk-based capital 3,273,300 13.69 1,912,747 8.0 2,390,934 10.0 Tier 1 risk-based capital 3,034,883 12.69 1,434,560 6.0 1,912,747 8.0 Tier 1 leverage capital 3,034,883 8.72 1,392,821 4.0 1,741,026 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, which ended on January 1, 2022, and a subsequent three-year transition period ending on December 31, 2024. Therefore, the December, 31, 2021 regulatory capital ratios and amounts exclude the impact of the increased ACL on loans and leases, HTM investment securities, and unfunded loan commitments attributed to the adoption of CECL on January 1, 2020, 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. During the three year transition period, regulatory capital ratios will begin to phase out the aggregate amount of the regulatory capital benefit provided in the initial two years. For 2022, 2023, and 2024, the Company is allowed 75%, 50%, and 25% of the regulatory capital benefit as of December 31, 2021, respectively, with full absorption occurring in 2025.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Share Basic And Diluted	The following table summarizes the calculation of basic and diluted earnings per common share: Years ended December 31, (In thousands, except per share data) 2022 2021 2020 Net income $ 644,283 $ 408,864 $ 220,621 Less: Preferred stock dividends 15,919 7,875 7,875 Net income available to common stockholders 628,364 400,989 212,746 Less: Earnings allocated to participating securities 5,672 2,302 1,272 Earnings applicable to common stockholders $ 622,692 $ 398,687 $ 211,474 Weighted-average common shares outstanding - basic 167,452 89,983 89,967 Add: Effect of dilutive stock options and restricted stock 95 223 184 Weighted-average common shares outstanding - diluted 167,547 90,206 90,151 Basic earnings per common share $ 3.72 $ 4.43 $ 2.35 Diluted earnings per common share 3.72 4.42 2.35

Derivative Financial Instrument

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
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, including accrued interest, of derivative positions: At December 31, 2022 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 1,350,000 $ 1,515 $ 1,750,000 $ 9,632 Not designated as hedging instruments: Interest rate derivatives (1) 7,024,507 221,225 7,022,844 403,952 Mortgage banking derivatives (2) 3,283 32 — — Other (3) 161,934 134 606,478 915 Total not designated as hedging instruments 7,189,724 221,391 7,629,322 404,867 Gross derivative instruments, before netting $ 8,539,724 222,906 $ 9,379,322 414,499 Less: Master netting agreements 16,129 16,129 Cash collateral 184,095 — Total derivative instruments, after netting $ 22,682 $ 398,370 At December 31, 2021 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 1,000,000 $ 17,583 $ — $ — Not designated as hedging instruments: Interest rate derivatives (1) 4,463,048 141,243 4,372,846 21,570 Mortgage banking derivatives (2) 14,212 80 — — Other (3) 76,755 211 374,688 214 Total not designated as hedging instruments 4,554,015 141,534 4,747,534 21,784 Gross derivative instruments, before netting $ 5,554,015 159,117 $ 4,747,534 21,784 Less: Master netting agreements 6,364 6,364 Cash collateral 19,272 2,119 Total derivative instruments, after netting $ 133,481 $ 13,301 (1) Balances related to clearing houses are presented as a single unit of account. In accordance with their rule books, clearing houses legally characterize variation margin payments as settlement of derivatives rather than collateral against derivative positions. At December 31, 2022, and 2021, notional amounts of interest rate swaps cleared through clearing houses include $2.7 billion and (2) Notional amounts related to residential loans exclude approved floating rate commitments of $2.4 million and $1.0 million at December 31, 2022, and 2021, respectively. (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 $125.6 million and $66.0 million for asset derivatives and $559.2 million and $338.2 million for liability derivatives at December 31, 2022, and 2021, respectively, which have insignificant related fair values.
Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following tables present fair value positions transitioned from gross to net upon applying counterparty netting agreements: At December 31, 2022 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Pledged Net Amount Presented Amounts Not Offset Asset derivatives $ 217,246 $ 16,129 $ 184,095 $ 17,022 $ 17,392 Liability derivatives 16,129 16,129 — — 1,545 At December 31, 2021 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Pledged Net Amount Presented Amounts Not Offset Asset derivatives $ 25,636 $ 6,364 $ 19,272 $ — $ 51 Liability derivatives 8,483 6,364 2,119 — 428
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table summarizes the income statement effect of derivatives designated as cash flow hedges: Recognized In Years ended December 31, (In thousands) Net Interest Income 2022 2021 2020 Cash flow hedges: Interest rate derivatives Interest and fees on loans and leases $ 1,935 $ 10,676 $ 6,373 Interest rate derivatives Long-term debt 306 411 8,206 Net recognized on cash flow hedges $ 1,629 $ 10,265 $ (1,833) The following table summarizes information related to a fair value hedging adjustment: Consolidated Balance Sheet Line Item in Which Previously Hedged Item is Located Carrying Amount of Previously Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount At December 31, At December 31, (In thousands) 2022 2021 2022 2021 Long-term debt (1) $ 333,458 $ 338,811 $ 33,458 $ 38,811
Other Derivatives Not Designated For Hedge Accounting	The following table summarizes the income statement effect of derivatives not designated as hedging instruments: Recognized In Years ended December 31, (In thousands) Non-interest Income 2022 2021 2020 Interest rate derivatives Other income $ 25,092 $ 10,369 $ 11,068 Mortgage banking derivatives Mortgage banking activities (48) (776) 636 Other Other income 3,249 878 (1,696) Total not designated as hedging instruments $ 28,293 $ 10,471 $ 10,008

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Option, Disclosures [Table Text Block]	The following table compares the fair value to the unpaid principal balance of originated loans held for sale: At December 31, 2022 2021 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 1,991 $ 1,631 $ 360 $ 4,694 $ 5,034 $ (340)
Fair Value Of Assets And Liabilities Measured On Recurring Basis	The following table summarizes the fair values of assets and liabilities measured at fair value on a recurring basis: At December 31, 2022 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: AFS investment securities: U.S. Treasury notes $ 717,040 $ — $ — $ 717,040 Government agency debentures — 258,374 — 258,374 Municipal bonds and notes — 1,633,202 — 1,633,202 Agency CMO — 59,965 — 59,965 Agency MBS — 2,158,024 — 2,158,024 Agency CMBS — 1,406,486 — 1,406,486 CMBS — 896,640 — 896,640 CLO — 2,107 — 2,107 Corporate debt — 704,412 — 704,412 Private label MBS — 44,249 — 44,249 Other — 12,198 — 12,198 Total AFS investment securities 717,040 7,175,657 — 7,892,697 Gross derivative instruments, before netting (1) 79 222,827 — 222,906 Originated loans held for sale — 1,991 — 1,991 Investments held in Rabbi Trusts 12,103 — — 12,103 Alternative investments (2) 430 — — 89,678 Total financial assets $ 729,652 $ 7,400,475 $ — $ 8,219,375 Financial Liabilities: Gross derivative instruments, before netting (1) $ 843 $ 413,656 $ — $ 414,499 At December 31, 2021 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: AFS investment securities: U.S. Treasury notes $ 396,966 $ — $ — $ 396,966 Agency CMO — 90,384 — 90,384 Agency MBS — 1,593,403 — 1,593,403 Agency CMBS — 1,232,541 — 1,232,541 CMBS — 886,263 — 886,263 CLO — 21,847 — 21,847 Corporate debt — 13,450 — 13,450 Total AFS investment securities 396,966 3,837,888 — 4,234,854 Gross derivative instruments, before netting (1) 187 158,930 — 159,117 Originated loans held for sale — 4,694 — 4,694 Investments held in Rabbi Trust 3,416 — — 3,416 Alternative investments (2) 1,877 — — 27,732 Total financial assets $ 402,446 $ 4,001,512 $ — $ 4,429,813 Financial Liabilities: Gross derivative instruments, before netting (1) $ 141 $ 21,643 $ — $ 21,784 (1) Additional information regarding the impact of netting derivative assets and derivative liabilities, as well as the impact from offsetting cash collateral paid to the same derivative counterparties, can be found in Note 17: Derivative Financial Instruments. (2) Certain 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 following table summarizes the carrying amounts, estimated fair values, and classifications within the fair value hierarchy of selected financial instruments and mortgage servicing rights: At December 31, 2022 2021 (In thousands) Carrying Fair Carrying Fair Assets: Level 1 Cash and cash equivalents $ 839,943 $ 839,943 $ 461,570 $ 461,570 Level 2 HTM investment securities 6,564,697 5,761,453 6,198,125 6,280,936 Level 3 Loans and leases, net 49,169,685 47,604,463 21,970,542 21,702,732 Mortgage servicing rights 9,515 27,043 9,237 12,527 Liabilities: Level 2 Deposit liabilities $ 49,893,391 $ 49,893,391 $ 28,049,259 $ 28,049,259 Time deposits 4,160,949 4,091,979 1,797,770 1,794,829 Securities sold under agreements to repurchase and other borrowings 1,151,830 1,151,797 674,896 676,581 FHLB advances 5,460,552 5,459,218 10,997 11,490 Long-term debt (1) 1,073,128 1,001,779 562,931 515,912

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The following table summarizes the changes in the benefit obligation, fair value of plan assets, and funded status of the defined benefit pension and postretirement benefit plans at December 31: Pension SERP OPEB (In thousands) 2022 2021 2022 2021 2022 2021 Change in benefit obligation: Beginning balance $ 250,263 $ 266,414 $ 1,873 $ 2,046 $ 1,904 $ 1,998 Benefit obligation assumed from Sterling — — 4,517 — 26,030 — Service cost — — — — 34 — Interest cost 5,565 4,663 107 30 652 19 Actuarial (gain) loss (57,751) (11,131) (581) (77) (4,992) 32 Benefits and administrative expenses paid (10,241) (9,683) (1,671) (126) (806) (145) Ending balance 187,836 250,263 4,245 1,873 22,822 1,904 Change in plan assets: Beginning balance 271,846 266,268 — — — — Actual return on plan assets (60,223) 15,261 — — — — Employer contributions — — 1,671 126 806 145 Benefits paid (10,241) (9,683) (1,671) (126) (806) (145) Ending balance 201,382 271,846 — — — — Funded status (1) $ 13,546 $ 21,583 $ (4,245) $ (1,873) $ (22,822) $ (1,904) (1) The overfunded (underfunded) status of each plan is respectively included in Accrued interest receivable and other assets or Accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets, as applicable. Excluding the impact of the merger with Sterling, the change in the total funded status of the defined benefit pension and postretirement benefit plans is primarily attributed to higher actuarial gains due to the increase in discount rate and, for the pension plan only, a negative return on plan assets due to lower market valuations. The following table sets forth by level within the fair value hierarchy the Pension Plan's assets at fair value: At December 31, 2022 2021 (In thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Common collective trusts — 172,941 — 172,941 — 230,923 — 230,923 Registered investment companies $ 26,923 $ — $ — $ 26,923 $ 39,082 $ — $ — $ 39,082 Cash and cash equivalents 1,518 — — 1,518 1,841 — — 1,841 Total pension plan assets $ 28,441 $ 172,941 $ — $ 201,382 $ 40,923 $ 230,923 $ — $ 271,846
Schedule of Assumptions Used	The following table summarizes the weighted-average assumptions used to determine the benefit obligation at December 31: Discount Rate 2022 2021 Pension: Webster Bank Pension Plan 4.96 % 2.65 % SERP: Webster Bank Supplemental Defined Benefit Plan for Executive Officers 4.88 % 2.45 % Astoria Bank Excess Benefit and Supplemental Benefit Plans 4.77 % n/a Astoria Bank Directors' Retirement Plan 4.70 % n/a Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors 4.70 % n/a Supplemental Executive Retirement Plan of Provident Bank 5.04 % n/a Supplemental Executive Retirement Plan of Provident Bank - Other 4.90 % n/a OPEB: Webster Bank Postretirement Medical Benefit Plan 4.72 % 1.99 % Sterling Bancorp Supplemental Postretirement Life Insurance Plan 4.70 % n/a Astoria Bank Postretirement Welfare Benefit Plans 4.94 % n/a Split Dollar Life Insurance Arrangement 4.63 % n/a The following table summarizes the weighted-average assumptions used to determine net periodic benefit (income) cost for the years ended December 31: Discount Rate 2022 2021 2020 Pension: Webster Bank Pension Plan 2.65 % 2.29 % 3.07 % SERP: Webster Bank Supplemental Defined Benefit Plan for Executive Officers 2.45 % 1.91 % 2.82 % Astoria Bank Excess Benefit and Supplemental Benefit Plans 2.58 % n/a n/a Astoria Bank Directors' Retirement Plan 2.23 % n/a n/a Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors 2.37 % n/a n/a Supplemental Executive Retirement Plan of Provident Bank 2.76 % n/a n/a Supplemental Executive Retirement Plan of Provident Bank - Other 2.38 % n/a n/a OPEB: Webster Bank Postretirement Medical Benefit Plan 1.99 % 1.40 % 2.50 % Sterling Bancorp Supplemental Postretirement Life Insurance Plan 2.35 % n/a n/a Astoria Bank Postretirement Welfare Benefit Plans 2.93 % n/a n/a Split Dollar Life Insurance Arrangement 2.20 % n/a n/a Expected Long-Term Rate of Return on Plan Assets 2022 2021 2020 Pension: Webster Bank Pension Plan 5.50 % 5.50 % 5.75 % Assumed Health Care Cost Trend Rate (1) 2022 2021 2020 OPEB: Webster Bank Postretirement Medical Benefit Plan 6.25 % 6.50 % 6.50 % Astoria Bank Postretirement Welfare Benefit Plans 6.60 % n/a n/a (1) The rates to which the healthcare cost trend rates are assumed to decline (ultimate trend rates) along with the year that the ultimate trend rates will be reached for the Webster Bank Postretirement Medical Benefit Plan and the Astoria Bank Postretirement Welfare Benefit Plans are 4.40% in 2030, and 4.75% in 2033, respectively.
Schedule of Net Periodic Benefit Cost Not yet Recognized	The following table summarizes the amounts recorded in accumulated other comprehensive (loss) income that have not yet been recognized in net periodic benefit (income) cost at December 31: Pension SERP OPEB (In thousands) 2022 2021 2022 2021 2022 2021 Net actuarial loss (gain) $ 56,717 $ 41,792 $ 50 $ 658 $ (5,573) $ (620) Deferred tax benefit (expense) 15,383 8,636 14 136 (1,512) (128) Net amount recorded in (AOCL) AOCI $ 41,334 $ 33,156 $ 36 $ 522 $ (4,061) $ (492)
Summary of Net Periodic Benefit Cost	The following table summarizes the components of net periodic benefit (income) cost for the years ended December 31: Pension SERP OPEB (In thousands) 2022 2021 2020 2022 2021 2020 2022 2021 2020 Service cost $ — $ — $ — $ — $ — $ — $ 34 $ — $ — Interest cost 5,565 4,663 6,511 107 30 46 652 19 46 Expected return on plan assets (14,675) (14,385) (13,522) — — — — — — Amortization of actuarial loss (gain) 2,224 4,102 4,027 26 38 23 (40) (38) (74) Net periodic benefit (income) cost (1) $ (6,886) $ (5,620) $ (2,984) $ 133 $ 68 $ 69 $ 646 $ (19) $ (28) (1) Net periodic benefit (income) cost is included in Other expense on the accompanying Consolidated Statements of Income.
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)	The following table summarizes amounts recognized in other comprehensive (loss) income, including reclassification adjustments, for the years ended December 31: Pension SERP OPEB (In thousands) 2022 2021 2020 2022 2021 2020 2022 2021 2020 Net actuarial loss (gain) $ 17,148 $ (12,008) $ 5,375 $ (581) $ (77) $ 194 $ (4,992) $ 33 $ (307) Amounts reclassified from (2,224) (4,102) (4,027) -4027000 (26) (38) (23) 40 38 74 Total loss (gain) recognized in $ 14,924 $ (16,110) $ 1,348 $ (607) $ (115) $ 171 $ (4,952) $ 71 $ (233)
Schedule of Expected Benefit Payments	At December 31, 2022, the expected future benefit payments for the Company's defined benefit pension and postretirement benefits plans are as follows: (In thousands) Pension SERP OPEB 2023 $ 10,224 $ 475 $ 2,850 2024 10,804 478 2,669 2025 11,236 460 2,522 2026 11,644 440 2,330 2027 12,046 419 2,153 Thereafter 63,884 1,724 7,800
Schedule of Multiemployer Plans	The following table summarizes information related to the Bank's participation in the multi-employer plan: (In thousands) Contributions Funded Status Plan Name Employer Identification Number Plan Number Surcharge Imposed 2022 2021 2020 2022 2021 Pentegra Defined Benefit Plan 13-5645888 333 No $448 $692 $998 At least 80 percent At least 80 percent

Share-Based Plans (Tables)

Share-Based Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Restricted Stock and Stock Option Activity	The following table summarizes stock-based compensation plan activity for the year ended December 31, 2022: Non-Vested Restricted Stock Awards Outstanding Stock Options Outstanding Time-Based Performance-Based Number of Weighted-Average Number of Weighted-Average Number of Weighted-Average Balance, beginning of period 529,284 $ 48.77 266,417 $ 50.03 107,612 $ 23.05 Granted (1) 711,503 54.95 307,852 57.66 — — Sterling replacement awards (2) 1,185,499 56.81 — — 10,972 29.14 Adjustment (3) 187,915 56.81 (187,915) 47.43 — — Vested (993,512) 48.69 (59,400) 56.14 — — Forfeited (140,947) 51.43 (16,580) 55.63 — — Exercised — — — — (30,355) 23.18 Balance, end of period 1,479,742 50.47 310,374 57.65 88,229 23.76 (1) Includes 127,524 shares for performance-based awards that were granted to certain executives on February 1, 2022, in order to incentivize their efforts to promote the integration of Webster and Sterling. One-third of these awards will be eligible to vest each year, in an amount ranging from 50% to 100% of target, based on the achievement of performance metrics in each of the three performance periods, and generally subject to the executive's continued employment. (2) The Company issued 1,126,495 shares of common stock and reissued 59,004 shares from Treasury stock in order to satisfy its consideration to replace Sterling equity awards under the merger agreement. During the year ended December 31, 2022, the Company recognized an increase of $18.8 million in stock compensation expense related to the replacement equity awards. (3) Due to the impact of the merger with Sterling on the level of achievement of target performance conditions for the open performance periods applicable to outstanding awards, certain non-vested performance-based restricted stock awards were converted into time-based restricted stock awards on January 31, 2022.

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Operating Results And Total Assets Reportable Segments	The following table presents balance sheet information, including the appropriate allocations, for the Company's reportable segments and the Corporate and Reconciling category: At December 31, 2022 (In thousands) Commercial HSA Consumer Corporate and Consolidated Goodwill $ 1,904,291 $ 57,779 $ 552,034 $ — $ 2,514,104 Total assets 44,380,582 122,729 10,625,334 16,148,876 71,277,521 At December 31, 2021 (In thousands) Commercial HSA Consumer Corporate and Consolidated Goodwill $ 131,000 $ 21,813 $ 385,560 $ — $ 538,373 Total assets 15,398,159 73,564 7,663,921 11,779,955 34,915,599 The following tables present operating results, including the appropriate allocations, for the Company’s reportable segments and the Corporate and Reconciling category: Year ended December 31, 2022 (In thousands) Commercial HSA Consumer Corporate and Consolidated Net interest income $ 1,346,384 $ 218,149 $ 720,789 $ (251,036) $ 2,034,286 Non-interest income 171,437 104,586 119,691 45,069 440,783 Non-interest expense 398,100 151,329 426,133 420,911 1,396,473 Pre-tax, pre-provision net revenue 1,119,721 171,406 414,347 (626,878) 1,078,596 Provision (benefit) for credit losses 276,550 — (3,754) 7,823 280,619 Income before income taxes 843,171 171,406 418,101 (634,701) 797,977 Income tax expense 207,188 45,937 108,657 (208,088) 153,694 Net income $ 635,983 $ 125,469 $ 309,444 $ (426,613) $ 644,283 Year ended December 31, 2021 (In thousands) Commercial HSA Consumer Corporate and Consolidated Net interest income $ 585,297 $ 168,595 $ 375,318 $ (228,121) $ 901,089 Non-interest income 83,538 102,814 95,887 41,133 323,372 Non-interest expense 192,977 134,258 297,217 120,648 745,100 Pre-tax, pre-provision net revenue 475,858 137,151 173,988 (307,636) 479,361 (Benefit) for credit losses (51,348) — (3,068) (84) (54,500) Income before income taxes 527,206 137,151 177,056 (307,552) 533,861 Income tax expense 134,965 36,619 42,139 (88,726) 124,997 Net income $ 392,241 $ 100,532 $ 134,917 $ (218,826) $ 408,864 Year ended December 31, 2020 (In thousands) Commercial HSA Consumer Corporate and Consolidated Net interest income $ 512,691 $ 162,363 $ 334,157 $ (117,818) $ 891,393 Non-interest income 66,867 100,826 97,778 19,806 285,277 Non-interest expense 181,218 133,919 334,008 109,801 758,946 Pre-tax, pre-provision net revenue 398,340 129,270 97,927 (207,813) 417,724 Provision (benefit) for credit losses 152,571 — (14,722) (99) 137,750 Income before income taxes 245,769 129,270 112,649 (207,714) 279,974 Income tax expense 61,086 34,501 24,956 (61,190) 59,353 Net income $ 184,683 $ 94,769 $ 87,693 $ (146,524) $ 220,621

Revenue from contracts with C_2

Revenue from contracts with Customers Revenue from Contracts with Customers Revenue from contracts with customers (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Products and Services [Table Text Block]	Year ended December 31, 2022 (In thousands) Commercial HSA Consumer Corporate and Consolidated Non-interest Income: Deposit service fees $ 27,663 $ 97,654 $ 71,353 $ 1,802 $ 198,472 Loan and lease related fees (1) 21,498 — — — 21,498 Wealth and investment services 11,350 — 28,957 (30) 40,277 Other — 6,932 1,493 — 8,425 Revenue from contracts with customers 60,511 104,586 101,803 1,772 268,672 Other sources of non-interest income 110,926 — 17,888 43,297 172,111 Total non-interest income $ 171,437 $ 104,586 $ 119,691 $ 45,069 $ 440,783 Year ended December 31, 2021 (In thousands) Commercial HSA Consumer Corporate and Consolidated Non-interest Income: Deposit service fees $ 16,933 $ 94,844 $ 50,561 $ 372 $ 162,710 Wealth and investment services 12,152 — 27,471 (37) 39,586 Other — 7,970 2,140 — 10,110 Revenue from contracts with customers 29,085 102,814 80,172 335 212,406 Other sources of non-interest income 54,453 — 15,715 40,798 110,966 Total non-interest income $ 83,538 $ 102,814 $ 95,887 $ 41,133 $ 323,372 Year ended December 31, 2020 (In thousands) Commercial HSA Consumer Corporate and Consolidated Non-interest Income: Deposit service fees $ 14,740 $ 92,693 $ 48,493 $ 106 $ 156,032 Wealth and investment services 10,644 — 22,307 (35) 32,916 Other — 8,133 1,656 — 9,789 Revenue from contracts with customers 25,384 100,826 72,456 71 198,737 Other sources of non-interest income 41,483 — 25,322 19,735 86,540 Total non-interest income $ 66,867 $ 100,826 $ 97,778 $ 19,806 $ 285,277 (1) A portion of loan and lease related fees comprises income generated from factored receivables and payroll financing activities that is within the scope of ASC Topic 606. These revenue streams were new to the Company in 2022 due to the businesses acquired in connection with the Sterling merger. Contracts with customers did not generate significant contract assets and liabilities at December 31, 2022, and 2021.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Credit Related Financial Instruments	The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk: At December 31, (In thousands) 2022 2021 Commitments to extend credit $ 11,237,496 $ 6,870,095 Standby letters of credit 380,655 224,061 Commercial letters of credit 53,512 58,175 Total credit-related financial instruments with off-balance sheet risk $ 11,671,663 $ 7,152,331
Unfunded Commitments, Allowance For Credit Loss	The following table summarizes the activity in the ACL on unfunded loan commitments, which provides for the unused portion of commitments to lend that are not unconditionally cancellable by the Company: Years ended December 31, (In thousands) 2022 2021 2020 Balance, beginning of period $ 13,104 $ 12,755 $ 2,367 Adoption of CECL — — 9,139 ACL established in the Sterling merger 6,749 — — Provision for credit losses 7,854 349 1,249 Balance, end of period $ 27,707 $ 13,104 $ 12,755

Parent Company Information (Tab

Parent Company Information (Tables)	12 Months Ended
	Dec. 31, 2022
Condensed Financial Information Disclosure [Abstract]
Schedule of Parent Company Information Balance Sheet	CONDENSED BALANCE SHEETS December 31, (In thousands) 2022 2021 Assets: Cash and due from banks $ 305,331 $ 316,193 Intercompany debt securities 150,000 150,000 Investment in subsidiaries 8,631,202 3,526,782 Alternative investments 46,349 20,163 Other assets 13,358 3,953 Total assets $ 9,146,240 $ 4,017,091 Liabilities and stockholders’ equity: Senior notes $ 480,878 $ 485,611 Subordinated notes 514,930 — Junior subordinated debt 77,320 77,320 Accrued interest payable 7,457 5,861 Due to subsidiaries 3,858 488 Other liabilities 5,611 9,486 Total liabilities 1,090,054 578,766 Stockholders’ equity 8,056,186 3,438,325 Total liabilities and stockholders’ equity $ 9,146,240 $ 4,017,091
Schedule of Parent Company Information Income Statement	CONDENSED STATEMENTS OF INCOME Years ended December 31, (In thousands) 2022 2021 2020 Income: Dividend income from bank subsidiary $ 475,000 $ 200,000 $ 20,000 Interest income on securities and interest-bearing deposits 5,955 3,444 5,530 Alternative investments income 6,416 13,033 2,467 Other non-interest income 112 75 634 Total income 487,483 216,552 28,631 Expense: Interest expense on borrowings 34,284 16,876 18,684 Merger-related expenses 40,314 16,266 — Other non-interest expense 22,592 15,921 16,426 Total expense 97,190 49,063 35,110 Income (loss) before income taxes and equity in undistributed earnings of subsidiaries 390,293 167,489 (6,479) Income tax benefit 20,799 3,121 4,572 Equity in undistributed earnings of subsidiaries 233,191 238,254 222,528 Net income $ 644,283 $ 408,864 $ 220,621
Schedule of Parent Company Information Comprehensive Income Statement	CONDENSED STATEMENTS OF COMPREHENSIVE INCOME Years ended December 31, (In thousands) 2022 2021 2020 Net income $ 644,283 $ 408,864 $ 220,621 Other comprehensive (loss) income, net of tax: Derivative instruments 226 226 2,622 Other comprehensive (loss) income of subsidiaries (662,606) (65,062) 75,706 Other comprehensive (loss) income, net of tax (662,380) (64,836) 78,328 Comprehensive (loss) income $ (18,097) $ 344,028 $ 298,949
Schedule of Parent Company Information Cash Flow Statement	CONDENSED STATEMENTS OF CASH FLOWS Years ended December 31, (In thousands) 2022 2021 2020 Operating activities: Net income $ 644,283 $ 408,864 $ 220,621 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries (233,191) (238,254) (222,528) Common stock contribution to charitable foundation 10,500 — — Other, net (2,853) 3,562 29,697 Net cash provided by operating activities $ 418,739 $ 174,172 $ 27,790 Investing activities: Alternative investments (capital call), net of distributions (16,292) (6,304) (3,751) Net cash received in business combination 193,238 — — Net cash provided by (used in) investing activities 176,946 (6,304) (3,751) Financing activities: Dividends paid to common stockholders (247,767) (145,223) (144,967) Dividends paid to preferred stockholders (13,725) (7,875) (7,875) Exercise of stock options 703 3,492 240 Common stock repurchase program (322,103) — (76,556) Common shares acquired related to stock compensation plan activity (23,655) (4,384) (3,506) Net cash (used in) by financing activities (606,547) (153,990) (232,664) Net (decrease) increase in cash and cash equivalents (10,862) 13,878 (208,625) Cash and cash equivalents at beginning of year 316,193 302,315 510,940 Cash and cash equivalents at end of year $ 305,331 $ 316,193 $ 302,315

Summary of Significant Accoun_4

Summary of Significant Accounting Policies New Accounting Pronouncements - Narrative (Details)	12 Months Ended
	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Threshold Period Past Due	90 days
Building and Building Improvements | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Building and Building Improvements | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Leasehold Improvements | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Furniture and Fixtures | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Information Technology and Data Processing | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Information Technology and Data Processing | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Useful Life	7 years

Variable Interest Entities - Su

Variable Interest Entities - Summary of LIHTC Investments and Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 31, 2022	Dec. 31, 2021
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Gross investment in LIHTC	$ 797,453		$ 68,635
Accumulated amortization	(69,424)		(25,216)
Net investment in LIHTC	728,029		43,419
Unfunded commitments for LIHTC investments	$ 335,959		$ 11,106
Sterling
Variable Interest Entity [Line Items]
Gross investment in LIHTC		$ 517,000
Unfunded commitments for LIHTC investments		$ 267,300

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 71,277,521	$ 34,915,599
Total liabilities	63,221,335	31,477,274
Commitments approved	313	0	$ 4,657
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Commitments approved	211,800	10,100
Other Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	144,900	61,500
Unfunded Loan Commitment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable interest entities, total exposure of other investments including unfunded commitments	$ 243,900	$ 95,900

Mergers and Acquisitions - Narr

Mergers and Acquisitions - Narrative (Details) $ in Thousands					12 Months Ended
	Nov. 07, 2022 USD ($)	Feb. 18, 2022 USD ($)	Jan. 31, 2022 USD ($) shares	Apr. 19, 2021	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 11, 2023 USD ($)	Oct. 30, 2020 USD ($)	Dec. 16, 2019 USD ($)
Business Acquisition [Line Items]
Preferred stock, convertible | shares			1
Goodwill					$ 2,514,104	$ 538,373	$ 538,373
Provision (benefit) for credit losses					$ 280,619	$ (54,500)	$ 137,750
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (as a percent)			6.50%
Preferred Stock Series G Issued
Business Acquisition [Line Items]
Preferred stock, dividend rate (as a percent)					6.50%
Sterling
Business Acquisition [Line Items]
Share exchange ratio				0.4630
Goodwill			$ 1,939,765
Provision (benefit) for credit losses					$ 175,100
Aggregate principal amount			$ 3,240,535						$ 225,000	$ 274,000
Sterling | Core Deposits
Business Acquisition [Line Items]
Acquired intangible assets, useful life			10 years
Sterling | Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets, useful life			10 years
Bend Financial, Inc.
Business Acquisition [Line Items]
Equity interests acquired		100%
Cash consideration		$ 55,300
Aggregate principal amount		19,300
Bend Financial, Inc. | Internal use software
Business Acquisition [Line Items]
Intangible assets acquired		15,900
Bend Financial, Inc. | Customer Relationships
Business Acquisition [Line Items]
Intangible assets acquired		$ 3,000
Inland Bank and Trust HSA Portfolio Acquisition
Business Acquisition [Line Items]
Cash and deposits received from acquisition	$ 15,600
Deposit premium based on final settlement	2%
Core deposit intangible asset	$ 300
InterLINK Acquisition | Subsequent Event
Business Acquisition [Line Items]
Core deposit intangible asset								$ 9,000,000

Mergers and Acquisitions - Summ

Mergers and Acquisitions - Summary of Purchase Price Consideration (Details) - Sterling - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Webster common stock issued (in shares)	87,965,239
Price per share of Webster common stock on January 31, 2022 (in dollars per share)	$ 56.81
Total consideration	$ 5,180,300
Common Stock
Business Acquisition [Line Items]
Total consideration	4,997,305
Preferred Stock
Business Acquisition [Line Items]
Total consideration	138,942	$ 138,942	$ 0	$ 0
Replacement Equity Awards
Business Acquisition [Line Items]
Total consideration	43,877
Fractional Shares
Business Acquisition [Line Items]
Total consideration	$ 176

Mergers and Acquisitions - Su_2

Mergers and Acquisitions - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 30, 2020	Dec. 16, 2019
Liabilities:
Goodwill		$ 2,514,104	$ 538,373	$ 538,373
ROU lease assets		$ 191,068	$ 119,926
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net	Property and equipment, net
Operating lease liabilities		$ 239,281	$ 144,804
Operating lease liabilities, location	Accrued expenses and other liabilities	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Sterling
Business Acquisition [Line Items]
Total consideration	$ 5,180,300
Assets:
Cash and due from banks	510,929
Interest-bearing deposits	3,207
Investment securities available-for-sale	4,429,948
Federal Home Loan Bank and Federal Reserve Bank Stock	150,502
Loans held for sale	23,517
Unpaid principal balance, total loans and leases		$ 20,816,348
Total loans and leases	20,498,706
Deferred tax assets, net	(51,487)
Premises and equipment	264,421
Other intangible assets	210,100
Bank-owned life insurance policies	645,510
Accrued interest receivable and other assets	960,893
Total assets acquired	27,646,246
Liabilities:
Non-interest-bearing deposits	6,620,248
Interest-bearing deposits	16,643,755
Securities sold under agreements to repurchase and other borrowings	27,184
Long-term debt	516,881
Accrued expenses and other liabilities	597,643
Total liabilities assumed	24,405,711
Net assets acquired	3,240,535				$ 225,000	$ 274,000
Goodwill	1,939,765
ROU lease assets	100,000
Operating lease liabilities	106,900
Sterling | Commercial non-mortgage
Assets:
Unpaid principal balance, total loans and leases		5,570,782
Total loans and leases	5,527,657
Sterling | Asset-based
Assets:
Unpaid principal balance, total loans and leases		694,137
Total loans and leases	683,958
Sterling | Commercial real estate
Assets:
Unpaid principal balance, total loans and leases		6,790,600
Total loans and leases	6,656,405
Sterling | Multi-family
Assets:
Unpaid principal balance, total loans and leases		4,303,381
Total loans and leases	4,255,906
Sterling | Equipment financing
Assets:
Unpaid principal balance, total loans and leases		1,350,579
Total loans and leases	1,314,311
Sterling | Warehouse lending
Assets:
Unpaid principal balance, total loans and leases		647,767
Total loans and leases	643,754
Sterling | Residential
Assets:
Unpaid principal balance, total loans and leases		1,313,785
Total loans and leases	1,281,637
Sterling | Home equity
Assets:
Unpaid principal balance, total loans and leases		132,758
Total loans and leases	122,553
Sterling | Other consumer
Assets:
Unpaid principal balance, total loans and leases		$ 12,559
Total loans and leases	$ 12,525

Mergers and Acquisitions - Sche

Mergers and Acquisitions - Schedule of PCD Loans and Leases by Portfolio Segment (Details) - Sterling $ in Thousands	Jan. 31, 2022 USD ($)
Business Acquisition [Line Items]
Unpaid principal balance	$ 3,936,434
ACL at acquisition	(136,316)
Non-credit (discount)	(43,731)
Fair value	3,756,387
Commercial
Business Acquisition [Line Items]
Unpaid principal balance	3,394,963
ACL at acquisition	(115,464)
Non-credit (discount)	(40,947)
Fair value	3,238,552
Consumer
Business Acquisition [Line Items]
Unpaid principal balance	541,471
ACL at acquisition	(20,852)
Non-credit (discount)	(2,784)
Fair value	$ 517,835

Mergers and Acquisitions - Su_3

Mergers and Acquisitions - Summary of Supplemental Pro Forma Information (Details) - Sterling - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Net interest income	$ 1,961,005	$ 1,802,862
Non-interest income	440,783	487,301
Net income	$ 869,639	$ 574,927

Mergers and Acquisitions- Summa

Mergers and Acquisitions- Summary of Supplemental Pro Forma Information Adjustments (Details) - Sterling - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Merger-related expenses	$ 246,461	$ 37,454
Compensation and benefits
Business Acquisition [Line Items]
Merger-related expenses	79,001	13,987
Occupancy
Business Acquisition [Line Items]
Merger-related expenses	36,586	256
Technology and equipment
Business Acquisition [Line Items]
Merger-related expenses	24,688	290
Professional and outside services
Business Acquisition [Line Items]
Merger-related expenses	416	0
Marketing
Business Acquisition [Line Items]
Merger-related expenses	73,070	22,273
Other expense
Business Acquisition [Line Items]
Merger-related expenses	$ 32,700	$ 648

Mergers and Acquisitions - Sc_2

Mergers and Acquisitions - Schedule of Restructuring Reserve by Type of Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Balance, beginning of period	$ 10,835
Additions, charged to expense	70,244
Cash payments	(38,804)
Other (1)	(4,330)
Balance, end of period	37,945
Severance
Business Acquisition [Line Items]
Balance, beginning of period	10,835
Additions, charged to expense	36,092
Cash payments	(35,014)
Other (1)	(4,330)
Balance, end of period	7,583
Severance | Sterling
Business Acquisition [Line Items]
Other (1)	(4,100)
Contract Termination
Business Acquisition [Line Items]
Balance, beginning of period	0
Additions, charged to expense	34,152
Cash payments	(3,790)
Other (1)	0
Balance, end of period	$ 30,362

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 6,564,879	$ 6,198,339
Unrealized Gains	2,770	138,254
Unrealized Losses	(806,196)	(55,657)
Fair Value	5,761,453	6,280,936
Debt Securities, Held-to-maturity, Allowance for Credit Loss	182	214	$ 299	$ 0
Debt Securities, Held-to-maturity, Current	6,564,697	6,198,125
Interest Receivable	226,300	50,700
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	31	41,499
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	864,489	34,342
Pledged Financial Instruments, Not Separately Reported, Debt Securities Held-to-Maturity	1,857,512	3,077,256
Pledged Financial Instruments, Not Separately Reported, Debt Securities Available-for-sale or Held-for-investment	3,768,173	1,780,164
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	8,757,155	4,227,697
Fair Value	7,892,697	4,234,854
Held-to-maturity Securities [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Interest Receivable	24,200	21,200
Available-for-sale Securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Interest Receivable	36,900	7,500
Agency CMO
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	28,358	42,405
Unrealized Gains	0	655
Unrealized Losses	(2,060)	(25)
Fair Value	26,298	43,035
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Current	28,358	42,405
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0	2,326
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	5,019	51
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	64,984	88,109
Fair Value	59,965	90,384
Agency MBS
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	2,626,114	2,901,593
Unrealized Gains	827	71,444
Unrealized Losses	(339,592)	(11,788)
Fair Value	2,287,349	2,961,249
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Current	2,626,114	2,901,593
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	26	36,130
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	303,339	11,020
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	2,461,337	1,568,293
Fair Value	2,158,024	1,593,403
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	2,831,949	2,378,475
Unrealized Gains	845	11,202
Unrealized Losses	(407,648)	(43,844)
Fair Value	2,425,146	2,345,833
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Current	2,831,949	2,378,475
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0	2,537
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	258,114	18,544
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,664,600	1,248,548
Fair Value	1,406,486	1,232,541
CMBS
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	149,613	169,948
Unrealized Gains	0	3,381
Unrealized Losses	(9,713)	0
Fair Value	139,900	173,329
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Current	149,613	169,948
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0	506
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	32,948	1,883
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	929,588	887,640
Fair Value	896,640	886,263
CLO
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	13
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	2,108	21,860
Fair Value	2,107	21,847
Corporate debt
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	91,587	1,133
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	795,999	14,583
Fair Value	704,412	13,450
Municipal Bonds [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	928,845	705,918
Unrealized Gains	1,098	51,572
Unrealized Losses	(47,183)	0
Fair Value	882,760	757,490
Debt Securities, Held-to-maturity, Allowance for Credit Loss	182	214
Debt Securities, Held-to-maturity, Current	928,663	705,704
U.S. Treasury notes
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	38,928	1,698
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	755,968	398,664
Fair Value	717,040	$ 396,966
Government agency debentures
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	43,644
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	302,018
Fair Value	258,374
Municipal bonds and notes
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	85,913
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,719,110
Fair Value	1,633,202
Private label MBS
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4,646
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	48,895
Fair Value	44,249
Other
Debt Securities, Available-for-sale [Abstract]
Unrealized Gains	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	350
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	12,548
Fair Value	$ 12,198

Investment Securities (Summar_2

Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Detail) $ in Thousands	Dec. 31, 2022 USD ($) holding	Dec. 31, 2021 USD ($) holding
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,417,865	$ 2,272,641
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(532,120)	(17,086)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,429,126	558,515
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (332,369)	$ (17,256)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1,282	162
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 7,846,991	$ 2,831,156
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(864,489)	(34,342)
Agency CMO
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	55,693	7,895
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(4,640)	$ (51)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	4,272
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (379)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	39	2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 59,965	$ 7,895
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(5,019)	(51)
Agency MBS
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,641,544	506,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(206,412)	(7,354)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	515,206	110,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (96,927)	$ (3,666)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	460	70
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 2,156,750	$ 617,289
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(303,339)	(11,020)
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	485,333	632,213
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(68,674)	(6,163)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	921,153	335,480
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (189,440)	$ (12,381)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	132	28
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,406,486	$ 967,693
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(258,114)	(18,544)
CMBS
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	273,150	724,762
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(8,982)	(1,744)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	598,490	81,253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (23,966)	$ (139)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	52	50
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 871,640	$ 806,015
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(32,948)	(1,883)
CLO
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,107	21,848
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1)	$ (13)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 2,107	$ 21,848
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1)	(13)
Corporate debt
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	692,990	4,203
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(89,692)	(76)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,421	9,247
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,895)	$ (1,057)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	105	3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 701,411	$ 13,450
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(91,587)	(1,133)
U.S. Treasury notes
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	337,563	396,966
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(19,167)	$ (1,698)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	379,477
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (19,761)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	23	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 717,040	$ 396,966
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(38,928)	$ (1,698)
Government agency debentures
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	258,374
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (43,644)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	19
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 258,374
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(43,644)
Municipal bonds and notes
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,616,771
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (85,913)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	444
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,616,771
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(85,913)
Private label MBS
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	44,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (4,646)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 44,249
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,646)
Other
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	12,198
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (350)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 12,198
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (350)

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Fair Value	$ 7,892,697,000	$ 4,234,854,000
Increase In Available For Sale Debt Securities	830,100,000
Interest Receivable	226,300,000	50,700,000
Debt Maturity, Held-to-Maturity, Non-Accrual	0	0
Callable [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Fair Value	2,900,000,000
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	900,000,000
Held-to-maturity Securities [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Interest Receivable	$ 24,200,000	$ 21,200,000

Investment Securities (Summar_3

Investment Securities (Summary Of Sale Proceeds Of Available For Sale Securities) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of available-for-sale securities	$ 172,947	$ 0	$ 8,963
Gains	0	0	8
Losses	6,751	0	0
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ 6,751	$ 0	$ (8)

Investment Securities (Summar_4

Investment Securities (Summary Of Debt Securities By Contractual Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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	$ 204,757
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,200,088
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	1,459,962
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	5,892,348
Amortized Cost	8,757,155	$ 4,227,697
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	198,765
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,127,769
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	1,351,397
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	5,214,766
Fair Value	7,892,697	4,234,854
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	2,195
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	53,632
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	329,156
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	6,179,896
Investment securities held-to-maturity (fair value of $5,761,453 and $6,280,936)	6,564,879	6,198,339
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	2,194
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	54,275
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	312,741
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	5,392,243
Debt Securities, Held-to-maturity, Fair Value	$ 5,761,453	$ 6,280,936

Investment Securities (Summar_5

Investment Securities (Summary of Debt Securities Held-to-Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	$ 6,564,879	$ 6,198,339
Interest Receivable	226,300	50,700
Agency CMO
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	28,358	42,405
Agency MBS
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	2,626,114	2,901,593
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	2,831,949	2,378,475
Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	928,845	705,918
CMBS
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	149,613	169,948
Moody's, Aaa Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	485,648	377,374
Moody's, Aaa Rating [Member] | Agency CMO
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	0	0
Moody's, Aaa Rating [Member] | Agency MBS
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	0	0
Moody's, Aaa Rating [Member] | Agency commercial mortgage-backed securities (agency CMBS) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	0	0
Moody's, Aaa Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	336,035	207,426
Moody's, Aaa Rating [Member] | CMBS
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	149,613	169,948
Moody's, Aa1 Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	5,649,733	5,442,277
Moody's, Aa1 Rating [Member] | Agency CMO
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	28,358	42,405
Moody's, Aa1 Rating [Member] | Agency MBS
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	2,626,114	2,901,593
Moody's, Aa1 Rating [Member] | Agency commercial mortgage-backed securities (agency CMBS) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	2,831,949	2,378,475
Moody's, Aa1 Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	163,312	119,804
Moody's, Aa1 Rating [Member] | CMBS
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	0	0
Moody's, Aa2 Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	255,235	227,106
Moody's, Aa2 Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	255,235	227,106
Moody's, Aa3 Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	116,870	104,232
Moody's, Aa3 Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	116,870	104,232
Moody's, A1 Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	38,177	35,878
Moody's, A1 Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	38,177	35,878
Moody's, A2 Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	4,165	8,260
Moody's, A2 Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	4,165	8,260
Moody's, Baa2 Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	0	95
Moody's, Baa2 Rating [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	0	95
Moody's, Not Rated [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	15,051	3,117
Moody's, Not Rated [Member] | Municipal Bonds [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity securities	$ 15,051	$ 3,117

Investment Securities (Debt and

Investment Securities (Debt and Equity Securities Allowance for Credit Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 182	$ 214	$ 299	$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery	(32)	(85)	(98)
Pledged Financial Instruments, Not Separately Reported, Debt Securities Available-for-sale or Held-for-investment	3,768,173	1,780,164
Pledged Financial Instruments, Not Separately Reported, Debt Securities Held-to-Maturity	1,857,512	3,077,256
Pledged For Municipal Deposits
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Pledged Financial Instruments, Not Separately Reported, Debt Securities Available-for-sale or Held-for-investment	2,573,072	855,323
Pledged Financial Instruments, Not Separately Reported, Debt Securities Held-to-Maturity	1,596,777	1,834,117
Pledged For Borrowings
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Pledged Financial Instruments, Not Separately Reported, Debt Securities Available-for-sale or Held-for-investment	1,195,101	924,841
Pledged Financial Instruments, Not Separately Reported, Debt Securities Held-to-Maturity	$ 260,735	1,243,139
Cumulative Effect, Period of Adoption, Adjustment [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		$ 0	$ 0	$ 397

Loans and Leases (Detail)

Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized premiums	$ (68,700)	$ 12,300
Interest Receivable	226,300	50,700
Total Loans and Leases	49,764,426	22,271,729
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	40,103,951	15,179,966
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	12,997,163	5,463,321
Commercial | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,628,393	627,058
Commercial | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	16,392,795	6,882,480
Commercial | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,821,642	1,067,248
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6,621,982	1,139,859
Commercial | Warehouse lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	641,976	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,660,475	7,091,763
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,633,107	1,593,559
Consumer | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	7,963,420	5,412,905
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 63,948	$ 85,299

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Jan. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		$ 49,764,426	$ 22,271,729
90 or More Days Past Due and Accruing		726	2,496
Non-accrual		197,441	109,927
Total  Past Due and Non-accrual		42,059	40,704
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		9,660,475	7,091,763
90 or More Days Past Due and Accruing		13	0
Non-accrual		53,496	39,460
Total  Past Due and Non-accrual		25,640	29,506
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,633,107	1,593,559
90 or More Days Past Due and Accruing		0	0
Non-accrual		27,924	23,489
Total  Past Due and Non-accrual		15,193	18,920
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		63,948	85,299
90 or More Days Past Due and Accruing		13	0
Non-accrual		148	224
Consumer | Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		7,963,420	5,412,905
90 or More Days Past Due and Accruing		0	0
Non-accrual		25,424	15,747
Total  Past Due and Non-accrual		10,442	10,584
Consumer | 522291 Consumer Lending [Member]
Financing Receivable, Past Due [Line Items]
Non-accrual		148	224
Total  Past Due and Non-accrual		5	2
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		40,103,951	15,179,966
90 or More Days Past Due and Accruing		713	2,496
Non-accrual		143,945	70,467
Total  Past Due and Non-accrual		16,419	11,198
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		12,997,163	5,463,321
90 or More Days Past Due and Accruing		68	519
Non-accrual		39,057	5,046
Total  Past Due and Non-accrual		90	4,310
Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		16,392,795	6,882,480
90 or More Days Past Due and Accruing		645	1,977
Non-accrual		71,884	59,607
Total  Past Due and Non-accrual		12,598	4,802
Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,821,642	1,067,248
90 or More Days Past Due and Accruing		0	0
Non-accrual		20,024	2,086
Total  Past Due and Non-accrual		1,491	2,086
Commercial | 6172 Finance Lessors [Member]
Financing Receivable, Past Due [Line Items]
Non-accrual		12,344	3,728
Total  Past Due and Non-accrual		2,240	0
Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		6,621,982	1,139,859
90 or More Days Past Due and Accruing		0	0
Non-accrual		636	0
Total  Past Due and Non-accrual		0	0
Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,628,393	627,058
90 or More Days Past Due and Accruing		0	0
Non-accrual		12,344	3,728
Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		641,976	0
90 or More Days Past Due and Accruing		0
Non-accrual		0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		32,379	12,329
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		14,567	7,058
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		5,293	3,467
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,028	379
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer | Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		8,246	3,212
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		17,812	5,271
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,494	508
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		8,434	3,729
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		5,921	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,157	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		806	1,034
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		0
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		40,289	7,090
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		5,988	2,149
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		2,820	1,600
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		85	181
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer | Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		3,083	368
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		34,301	4,941
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		23,492	417
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		821	4,524
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		9,988	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		0
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		49,493,591	22,139,887
Financial Asset, Not Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		9,586,411	7,043,096
Financial Asset, Not Past Due | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,597,070	1,565,003
Financial Asset, Not Past Due | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		62,674	84,515
Financial Asset, Not Past Due | Consumer | Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		7,926,667	5,393,578
Financial Asset, Not Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		39,907,180	15,096,791
Financial Asset, Not Past Due | Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		12,933,052	5,456,831
Financial Asset, Not Past Due | Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		16,311,011	6,812,643
Financial Asset, Not Past Due | Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,795,697	1,065,162
Financial Asset, Not Past Due | Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		6,620,189	1,139,859
Financial Asset, Not Past Due | Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,605,255	622,296
Financial Asset, Not Past Due | Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		641,976
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		270,835	131,842
Financial Asset, Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		74,064	48,667
Financial Asset, Past Due | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		36,037	28,556
Financial Asset, Past Due | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,274	784
Financial Asset, Past Due | Consumer | Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		36,753	19,327
Financial Asset, Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		196,771	83,175
Financial Asset, Past Due | Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		64,111	6,490
Financial Asset, Past Due | Commercial | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		81,784	69,837
Financial Asset, Past Due | Commercial | Asset-based
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		25,945	2,086
Financial Asset, Past Due | Commercial | Multi-family
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		1,793	0
Financial Asset, Past Due | Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		23,138	$ 4,762
Financial Asset, Past Due | Commercial | Warehouse lending
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		0
us-gaap_FinancialAssetNotPastDueMember | Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases		$ 28,500
Financial Asset, Not Past Due, Approved And Refinanced | Commercial | Subsequent Event
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 26,800

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Loans and Leases Receivable Disclosure [Abstract]
Interest on non-accrual loans that would have been recorded as additional interest income	$ 16.9	$ 11	$ 9.7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | loan	107	150	192
Unamortized premiums	$ (68.7)	$ 12.3
Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | loan	3
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 3.6
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | loan	2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0.6
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | loan	2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0.3
Collateral Pledged [Member] | Federal Home Loan Bank Certificates and Obligations (FHLB) | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss	13,700
Commercial
Loans and Leases Receivable Disclosure [Abstract]
Write-down of TDR's	$ (14.7)	$ (3)	$ (17.6)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | loan		0	4
Financing Receivable, Troubled Debt Restructuring, Subsequent Default			$ 12.4

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		$ 301,187	$ 359,431	$ 209,096
Provision (benefit) charged to expense		272,797	(54,415)	137,848
Losses charged off		(87,522)	(18,654)	(55,333)
Recoveries		20,234	14,825	10,252
Specific reserves for TDR included in the balance of ALLL		594,741	301,187	359,431
Individually evaluated for impairment		47,234	21,073	16,137
Collectively evaluated for impairment		547,507	280,114	343,294
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		88,045	0	0
Sterling | Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 48,300
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss		0		57,568	$ 0
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		43,310	47,187	47,427
Provision (benefit) charged to expense		4,502	(5,764)	(18,488)
Losses charged off		(4,662)	(9,217)	(12,408)
Recoveries		8,797	11,104	7,112
Specific reserves for TDR included in the balance of ALLL		61,616	43,310	47,187
Individually evaluated for impairment		12,441	4,108	4,450
Collectively evaluated for impairment		49,175	39,202	42,737
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		9,669	0	0
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss		0		23,544	0
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		257,877	312,244	161,669
Provision (benefit) charged to expense		268,295	(48,651)	156,336
Losses charged off		(82,860)	(9,437)	(42,925)
Recoveries		11,437	3,721	3,140
Specific reserves for TDR included in the balance of ALLL		533,125	257,877	312,244
Individually evaluated for impairment		34,793	16,965	11,687
Collectively evaluated for impairment		498,332	240,912	300,557
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase		78,376	$ 0	0
Commercial | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss		$ 0		$ 34,024	$ 0

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDR	$ 194,822	$ 163,344
Specific reserves for TDR included in the balance of ALLL	594,741	301,187	$ 359,431	$ 209,096
Additional funds committed to borrowers in TDR status	1,724	5,975
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	533,125	257,877	312,244	161,669
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	14,700	3,000	17,600
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	61,616	43,310	47,187	$ 47,427
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	300	400	$ 800
Performing Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDR	110,868	110,625
Nonperforming Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDR	83,954	52,719
Troubled Debt Restructures [Member] | Nonperforming Financial Instruments [Member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	14,578	9,017
Troubled Debt Restructures [Member] | Nonperforming Financial Instruments [Member] | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDR included in the balance of ALLL	$ 3,559	$ 3,745

Loans and Leases (Information o

Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	107	150	192
Post-Modification Recorded Investment | $	$ 87,423	$ 21,977	$ 55,691
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases		0	4
Commercial, Non-Mortgage | Commercial | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	5	8	11
Post-Modification Recorded Investment | $	$ 291	$ 605	$ 1,070
Commercial, Non-Mortgage | Commercial | Adjusted Interest Rates [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	0	1
Post-Modification Recorded Investment | $	$ 0	$ 0	$ 96
Commercial, Non-Mortgage | Commercial | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	8	9	7
Post-Modification Recorded Investment | $	$ 765	$ 352	$ 607
Commercial, Non-Mortgage | Commercial | Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	19	12	24
Post-Modification Recorded Investment | $	$ 52,070	$ 14,160	$ 40,128
Commercial real estate | Commercial | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	1	1
Post-Modification Recorded Investment | $	$ 0	$ 183	$ 72
Commercial real estate | Commercial | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	0	2
Post-Modification Recorded Investment | $	$ 0	$ 0	$ 377
Commercial real estate | Commercial | Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	1	3
Post-Modification Recorded Investment | $	$ 0	$ 1,582	$ 306
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	2
Residential | Consumer | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	2	1	3
Post-Modification Recorded Investment | $	$ 1,185	$ 99	$ 485
Residential | Consumer | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	2	2	10
Post-Modification Recorded Investment | $	$ 133	$ 401	$ 1,133
Residential | Consumer | Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	8	3	26
Post-Modification Recorded Investment | $	$ 3,158	$ 280	$ 4,215
Home equity | Consumer | Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	85	3
Post-Modification Recorded Investment | $	$ 0	$ 1,809	$ 188
Home equity | Consumer | Adjusted Interest Rates [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	1	0	0
Post-Modification Recorded Investment | $	$ 74	$ 0	$ 0
Home equity | Consumer | Combination Rate and Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	21	6	5
Post-Modification Recorded Investment | $	$ 2,623	$ 1,025	$ 334
Home equity | Consumer | Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	37	22	96
Post-Modification Recorded Investment | $	$ 2,134	$ 1,481	$ 6,680
Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	3
Equipment Financing | Commercial | Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	3	0	0
Post-Modification Recorded Investment | $	$ 1,692	$ 0	$ 0
Asset-Based | Commercial | Other Concessions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	1	0	0
Post-Modification Recorded Investment | $	$ 23,298	$ 0	$ 0

Loans and Leases (Investments i

Loans and Leases (Investments in TDRs, Segregated by Risk Rating Exposure) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs	$ 194,822	$ 163,344
Total Loans and Leases	49,764,426	22,271,729
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	11,169,564	3,902,968
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,661,880	2,337,777
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3,487,488	2,272,548
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3,539,935	1,772,381
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,445,305	796,050
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5,530,594	1,829,351
Financing Receivable, Excluding Accrued Interest, Revolving	8,269,185	2,268,891
Total Loans and Leases	40,103,951	15,179,966
Commercial | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	5,287,261	2,288,196
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,979,460	1,249,399
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,057,097	825,657
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	829,845	667,171
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	678,464	307,613
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	804,822	310,671
Financing Receivable, Excluding Accrued Interest, Revolving	5,755,846	1,233,773
Total Loans and Leases	16,392,795	6,882,480
Commercial | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	19,659	7,609
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,901	19,141
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	9,424	14,896
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	15,904	14,131
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,163	6,113
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	55,553	25,850
Financing Receivable, Excluding Accrued Interest, Revolving	1,712,038	979,508
Total Loans and Leases	1,821,642	1,067,248
Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3,443,032	1,152,526
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,258,126	736,386
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,563,665	1,146,376
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,674,603	679,028
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,153,170	450,074
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,805,735	1,243,887
Financing Receivable, Excluding Accrued Interest, Revolving	98,832	55,044
Total Loans and Leases	12,997,163	5,463,321
Commercial | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,030,657	222,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,057,705	136,324
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	507,447	185,087
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	694,161	364,822
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	497,552	17,054
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,773,967	213,131
Financing Receivable, Excluding Accrued Interest, Revolving	60,493	566
Total Loans and Leases	6,621,982	1,139,859
Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	388,955	231,762
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	362,688	196,527
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	349,855	100,532
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	325,422	47,229
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	110,956	15,196
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	90,517	35,812
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Total Loans and Leases	1,628,393	627,058
Commercial | Warehouse lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	641,976
Total Loans and Leases	641,976	0
(1) - (6) Pass [Member] | Commercial | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	5,154,781	2,270,320
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,952,158	1,179,620
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	965,975	757,343
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	792,977	581,633
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	593,460	292,637
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	780,200	275,789
Financing Receivable, Excluding Accrued Interest, Revolving	5,670,532	1,182,562
Total Loans and Leases	15,910,083	6,539,904
(1) - (6) Pass [Member] | Commercial | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	19,659	7,609
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,901	19,141
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	9,424	12,810
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	14,413	13,456
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,163	6,113
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	55,553	25,850
Financing Receivable, Excluding Accrued Interest, Revolving	1,551,250	920,496
Total Loans and Leases	1,659,363	1,005,475
(1) - (6) Pass [Member] | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3,420,635	1,152,431
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,246,672	733,220
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,556,185	1,146,149
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,605,869	594,180
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,058,730	384,664
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,681,052	1,136,384
Financing Receivable, Excluding Accrued Interest, Revolving	97,832	55,044
Total Loans and Leases	12,666,975	5,202,072
(1) - (6) Pass [Member] | Commercial | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,992,980	222,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,057,705	135,924
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	507,065	185,087
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	694,066	322,688
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	444,564	17,054
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,748,337	203,558
Financing Receivable, Excluding Accrued Interest, Revolving	51,655	566
Total Loans and Leases	6,496,372	1,087,752
(1) - (6) Pass [Member] | Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	388,641	231,762
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	345,792	188,031
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	331,419	93,547
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	308,441	41,276
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	98,874	14,864
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	83,264	32,588
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Total Loans and Leases	1,556,431	602,068
(1) - (6) Pass [Member] | Commercial | Warehouse lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	641,976
Total Loans and Leases	641,976
(7) Special Mention [Member] | Commercial | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	104,277	14,216
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	15,598	22,892
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	21,168	37,877
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	263	15,575
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	14,370	9,721
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,770	15,399
Financing Receivable, Excluding Accrued Interest, Revolving	40,142	27,808
Total Loans and Leases	203,588	143,488
(7) Special Mention [Member] | Commercial | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0	675
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Revolving	80,476	59,012
Total Loans and Leases	80,476	59,687
(7) Special Mention [Member] | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	21,878	95
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,995	3,084
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	7,264	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	37,570	84,475
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	47,419	51,536
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	66,652	79,096
Financing Receivable, Excluding Accrued Interest, Revolving	1,000	0
Total Loans and Leases	190,778	218,286
(7) Special Mention [Member] | Commercial | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	37,677	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	95	35,201
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	40,307	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	726	0
Financing Receivable, Excluding Accrued Interest, Revolving	8,838	0
Total Loans and Leases	87,643	35,201
(7) Special Mention [Member] | Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	185	108
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	2,229
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	11,965	3,341
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	6,775	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	25	600
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Total Loans and Leases	18,950	6,278
(8) Substandard [Member] | Commercial | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	28,203	3,660
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	11,704	46,887
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	69,954	30,437
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	36,604	69,963
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	70,634	5,255
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	16,852	19,483
Financing Receivable, Excluding Accrued Interest, Revolving	41,917	23,403
Total Loans and Leases	275,868	199,088
(8) Substandard [Member] | Commercial | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	2,086
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,491	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Revolving	80,312	0
Total Loans and Leases	81,803	2,086
(8) Substandard [Member] | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	519	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,459	82
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	216	227
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	31,163	373
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	47,021	13,874
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	57,997	28,407
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Total Loans and Leases	139,375	42,963
(8) Substandard [Member] | Commercial | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	400
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	382	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0	6,933
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	12,681	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	24,904	9,573
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Total Loans and Leases	37,967	16,906
(8) Substandard [Member] | Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	314	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	16,711	8,388
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	18,436	4,756
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	5,016	2,612
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,307	332
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,228	2,624
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Total Loans and Leases	53,012	$ 18,712
(9) Doubtful [Member] | Commercial | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	3,255
Total Loans and Leases	3,256
(9) Doubtful [Member] | Commercial | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	34
Financing Receivable, Excluding Accrued Interest, Revolving	0
Total Loans and Leases	$ 35

Loans and Leases (Credit Qualit

Loans and Leases (Credit Quality Indicators) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans and Leases	$ 49,764,426	$ 22,271,729
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,042,000	2,198,697
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,399,022	1,077,624
Total Loans and Leases	9,660,475	7,091,763
Financing Receivable, Excluding Accrued Interest, Revolving	1,268,535	1,223,304
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	960,281	502,707
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	126,240	274,746
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	454,877	144,883
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,409,520	1,669,802
Consumer | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,740	4,515
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,663	14,955
Total Loans and Leases	63,948	85,299
Financing Receivable, Excluding Accrued Interest, Revolving	40,451	27,795
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	5,349	27,068
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,438	1,473
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	8,694	8,654
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	613	839
Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,965,372	2,096,428
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,304,919	999,477
Total Loans and Leases	7,963,420	5,412,905
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	901,353	448,723
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	94,152	246,929
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	424,742	96,219
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,272,882	1,525,129
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	73,888	97,754
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	90,440	63,192
Total Loans and Leases	1,633,107	1,593,559
Financing Receivable, Excluding Accrued Interest, Revolving	1,228,084	1,195,509
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	53,579	26,916
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	29,650	26,344
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	21,441	40,010
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	136,025	143,834
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	11,169,564	3,902,968
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,661,880	2,337,777
Total Loans and Leases	40,103,951	15,179,966
Financing Receivable, Excluding Accrued Interest, Revolving	8,269,185	2,268,891
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3,487,488	2,272,548
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,445,305	796,050
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3,539,935	1,772,381
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5,530,594	1,829,351
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3,443,032	1,152,526
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,258,126	736,386
Total Loans and Leases	12,997,163	5,463,321
Financing Receivable, Excluding Accrued Interest, Revolving	98,832	55,044
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,563,665	1,146,376
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,153,170	450,074
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,674,603	679,028
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,805,735	1,243,887
Commercial | Commercial real estate | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	21,878	95
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,995	3,084
Total Loans and Leases	190,778	218,286
Financing Receivable, Excluding Accrued Interest, Revolving	1,000	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	7,264	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	47,419	51,536
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	37,570	84,475
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	66,652	79,096
Commercial | Commercial real estate | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3,420,635	1,152,431
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,246,672	733,220
Total Loans and Leases	12,666,975	5,202,072
Financing Receivable, Excluding Accrued Interest, Revolving	97,832	55,044
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,556,185	1,146,149
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,058,730	384,664
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,605,869	594,180
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,681,052	1,136,384
Commercial | Commercial real estate | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	519	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,459	82
Total Loans and Leases	139,375	42,963
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	216	227
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	47,021	13,874
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	31,163	373
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	57,997	28,407
Commercial | Commercial real estate | (9) Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Total Loans and Leases	35
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	34
Commercial | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	5,287,261	2,288,196
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,979,460	1,249,399
Total Loans and Leases	16,392,795	6,882,480
Financing Receivable, Excluding Accrued Interest, Revolving	5,755,846	1,233,773
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,057,097	825,657
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	678,464	307,613
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	829,845	667,171
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	804,822	310,671
Commercial | Commercial non-mortgage | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	104,277	14,216
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	15,598	22,892
Total Loans and Leases	203,588	143,488
Financing Receivable, Excluding Accrued Interest, Revolving	40,142	27,808
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	21,168	37,877
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	14,370	9,721
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	263	15,575
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,770	15,399
Commercial | Commercial non-mortgage | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	5,154,781	2,270,320
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,952,158	1,179,620
Total Loans and Leases	15,910,083	6,539,904
Financing Receivable, Excluding Accrued Interest, Revolving	5,670,532	1,182,562
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	965,975	757,343
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	593,460	292,637
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	792,977	581,633
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	780,200	275,789
Commercial | Commercial non-mortgage | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	28,203	3,660
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	11,704	46,887
Total Loans and Leases	275,868	199,088
Financing Receivable, Excluding Accrued Interest, Revolving	41,917	23,403
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	69,954	30,437
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	70,634	5,255
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	36,604	69,963
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	16,852	19,483
Commercial | Commercial non-mortgage | (9) Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Total Loans and Leases	3,256
Financing Receivable, Excluding Accrued Interest, Revolving	3,255
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Commercial | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	19,659	7,609
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,901	19,141
Total Loans and Leases	1,821,642	1,067,248
Financing Receivable, Excluding Accrued Interest, Revolving	1,712,038	979,508
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	9,424	14,896
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,163	6,113
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	15,904	14,131
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	55,553	25,850
Commercial | Asset-based | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Total Loans and Leases	80,476	59,687
Financing Receivable, Excluding Accrued Interest, Revolving	80,476	59,012
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0	675
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0	0
Commercial | Asset-based | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	19,659	7,609
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,901	19,141
Total Loans and Leases	1,659,363	1,005,475
Financing Receivable, Excluding Accrued Interest, Revolving	1,551,250	920,496
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	9,424	12,810
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,163	6,113
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	14,413	13,456
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	55,553	25,850
Commercial | Asset-based | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Total Loans and Leases	81,803	2,086
Financing Receivable, Excluding Accrued Interest, Revolving	80,312	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	2,086
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,491	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0	0
Commercial | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	388,955	231,762
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	362,688	196,527
Total Loans and Leases	1,628,393	627,058
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	349,855	100,532
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	110,956	15,196
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	325,422	47,229
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	90,517	35,812
Commercial | Equipment financing | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	185	108
Total Loans and Leases	18,950	6,278
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	2,229
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	6,775	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	11,965	3,341
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	25	600
Commercial | Equipment financing | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	388,641	231,762
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	345,792	188,031
Total Loans and Leases	1,556,431	602,068
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	331,419	93,547
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	98,874	14,864
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	308,441	41,276
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	83,264	32,588
Commercial | Equipment financing | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	314	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	16,711	8,388
Total Loans and Leases	53,012	18,712
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	18,436	4,756
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,307	332
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	5,016	2,612
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,228	2,624
Commercial | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,030,657	222,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,057,705	136,324
Total Loans and Leases	6,621,982	1,139,859
Financing Receivable, Excluding Accrued Interest, Revolving	60,493	566
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	507,447	185,087
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	497,552	17,054
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	694,161	364,822
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,773,967	213,131
Commercial | Multi-family | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	37,677	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Total Loans and Leases	87,643	35,201
Financing Receivable, Excluding Accrued Interest, Revolving	8,838	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	40,307	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	95	35,201
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	726	0
Commercial | Multi-family | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,992,980	222,875
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,057,705	135,924
Total Loans and Leases	6,496,372	1,087,752
Financing Receivable, Excluding Accrued Interest, Revolving	51,655	566
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	507,065	185,087
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	444,564	17,054
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	694,066	322,688
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,748,337	203,558
Commercial | Multi-family | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	400
Total Loans and Leases	37,967	16,906
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	382	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	12,681	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0	6,933
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	24,904	9,573
Commercial | Warehouse lending
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Total Loans and Leases	641,976	0
Financing Receivable, Excluding Accrued Interest, Revolving	641,976
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Commercial | Warehouse lending | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Total Loans and Leases	641,976
Financing Receivable, Excluding Accrued Interest, Revolving	641,976
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
579 and below [Member] | Consumer | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	169	147
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	101	87
Total Loans and Leases	1,179	1,865
Financing Receivable, Excluding Accrued Interest, Revolving	707	1,196
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	29	215
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	36	40
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	116	159
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	21	21
579 and below [Member] | Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	52,464	9,478
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,693	1,051
Total Loans and Leases	206,453	95,906
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2,057	49,252
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,299	2,519
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	84,032	390
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	62,908	33,216
579 and below [Member] | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	426	380
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	386	446
Total Loans and Leases	35,237	31,263
Financing Receivable, Excluding Accrued Interest, Revolving	27,814	22,552
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	651	725
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	563	434
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	661	1,060
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4,736	5,666
800+ [Member] | Consumer | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	495	463
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	218	1,343
Total Loans and Leases	21,801	15,629
Financing Receivable, Excluding Accrued Interest, Revolving	19,196	10,160
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	544	2,398
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	247	231
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,045	916
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	56	118
800+ [Member] | Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	527,408	590,238
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	954,568	428,118
Total Loans and Leases	3,137,860	2,056,237
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	469,518	161,664
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28,361	105,198
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	160,596	35,502
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	997,409	735,517
800+ [Member] | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	25,475	35,678
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	35,129	30,157
Total Loans and Leases	627,009	624,364
Financing Receivable, Excluding Accrued Interest, Revolving	465,318	463,334
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	25,612	9,591
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	12,545	11,068
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	7,578	16,347
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	55,352	58,189
740-799 [Member] | Consumer | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	888	2,588
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,624	5,408
Total Loans and Leases	21,488	29,268
Financing Receivable, Excluding Accrued Interest, Revolving	12,218	9,528
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,959	8,303
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	941	379
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,494	2,985
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	364	77
740-799 [Member] | Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	963,026	1,083,608
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	946,339	421,380
Total Loans and Leases	3,066,028	2,244,504
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	311,295	154,960
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	43,684	95,662
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	111,913	32,172
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	689,771	456,722
740-799 [Member] | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	26,743	42,430
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	35,178	22,030
Total Loans and Leases	526,380	538,196
Financing Receivable, Excluding Accrued Interest, Revolving	398,692	409,518
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	17,621	9,413
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	7,765	7,711
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	8,111	13,317
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	32,270	33,777
670 to 739 [Member] | Consumer | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	977	1,061
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	603	7,034
Total Loans and Leases	15,564	32,219
Financing Receivable, Excluding Accrued Interest, Revolving	6,107	5,644
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2,480	13,602
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,041	607
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	4,238	3,859
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	118	412
670 to 739 [Member] | Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	381,515	374,460
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	350,671	135,146
Total Loans and Leases	1,301,688	870,617
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	103,999	73,499
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	18,451	34,550
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	62,365	25,099
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	384,687	227,863
670 to 739 [Member] | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	18,396	17,493
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	16,679	9,162
Total Loans and Leases	344,205	311,470
Financing Receivable, Excluding Accrued Interest, Revolving	259,646	233,744
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	8,175	5,889
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	7,614	5,802
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3,635	8,220
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	30,060	31,160
580-669 [Member] | Consumer | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	211	256
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	117	1,083
Total Loans and Leases	3,916	6,318
Financing Receivable, Excluding Accrued Interest, Revolving	2,223	1,267
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	337	2,550
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	173	216
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	801	735
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	54	211
580-669 [Member] | Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	40,959	38,644
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	49,648	13,782
Total Loans and Leases	251,391	145,641
Financing Receivable, Excluding Accrued Interest, Revolving	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	14,484	9,348
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,357	9,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	5,836	3,056
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	138,107	71,811
580-669 [Member] | Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,848	1,773
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,068	1,397
Total Loans and Leases	100,276	88,266
Financing Receivable, Excluding Accrued Interest, Revolving	76,614	66,361
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,520	1,298
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,163	1,329
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,456	1,066
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	$ 13,607	$ 15,042

Loans and Leases (Impaired Coll

Loans and Leases (Impaired Collateral) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Collateral Pledged [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 43,800	$ 16,600
Collateral Pledged [Member] | Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	45,200	34,900
Collateral Value [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 108,000	$ 86,000

Loans and Leases (Nonaccrual) (

Loans and Leases (Nonaccrual) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	$ 197,441	$ 109,927
Total  Past Due and Non-accrual	42,059	40,704
Interest on non-accrual loans that would have been recorded as additional interest income	16,900	11,000	$ 9,700
Commercial
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	143,945	70,467
Total  Past Due and Non-accrual	16,419	11,198
Commercial | Commercial non-mortgage
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	71,884	59,607
Total  Past Due and Non-accrual	12,598	4,802
Commercial | Asset-based
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	20,024	2,086
Total  Past Due and Non-accrual	1,491	2,086
Commercial | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	39,057	5,046
Total  Past Due and Non-accrual	90	4,310
Commercial | 6172 Finance Lessors [Member]
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	12,344	3,728
Total  Past Due and Non-accrual	2,240	0
Consumer
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	53,496	39,460
Total  Past Due and Non-accrual	25,640	29,506
Consumer | Residential
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	25,424	15,747
Total  Past Due and Non-accrual	10,442	10,584
Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	27,924	23,489
Total  Past Due and Non-accrual	15,193	18,920
Consumer | 522291 Consumer Lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	148	224
Total  Past Due and Non-accrual	$ 5	$ 2

Transfers of Financial Assets_2

Transfers of Financial Assets (Loans sold) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]
Net gain on sale	$ 705	$ 6,219	$ 18,295
Consumer
Servicing Assets at Fair Value [Line Items]
Net gain on sale	705	6,219	18,295
Ancillary Fee Income Generated by Servicing Financial Assets, Amount	219	1,440	3,230
Residential Mortgage Loans Servicing Retained [Member] | Consumer
Servicing Assets at Fair Value [Line Items]
Proceeds from sale	32,056	237,834	464,736
Residential | Consumer
Servicing Assets at Fair Value [Line Items]
Proceeds from sale	36,335	247,634	486,341
Fair value option adjustment	(94)	(413)	(240)
Gain (Loss) on Sale of Mortgage Loans	$ 580	$ 5,192	$ 15,305

Transfers of Financial Assets_3

Transfers of Financial Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from loans not originated for sale	$ 679,693	$ 82,187	$ 9,197
Net gain on sale	$ 705	6,219	18,295
Ancillary Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]	Net gain on sale
Residential
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights	$ 2,000,000
Bank servicing fees	5,900	1,700	1,500
Commercial Loan [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from loans not originated for sale	679,700	82,200	9,200
Net gain on sale	$ 3,300	$ 3,900	$ 300

Transfers of Financial Assets S

Transfers of Financial Assets Servicing Assets at Amortized Cost Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning balance	$ 9,237	$ 13,422	$ 17,484
Additions	289	2,053	4,373
Amortization	(870)	(5,593)	(6,562)
Adjustment to valuation allowance	0	(645)	(1,873)
Ending balance	9,515	9,237	13,422
Sterling
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Additions	$ 859	$ 0	$ 0

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) holding	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Abstract]
Land	$ 73,916	$ 9,436
Buildings and improvements	106,180	67,501
Leasehold improvements	84,477	65,606
Furniture, fixtures, and equipment	71,542	64,890
Data processing equipment and software	128,153	105,516
Property and equipment	464,268	312,949
Less: Accumulated depreciation and amortization	(225,152)	(228,318)
Premises and equipment, net	239,116	84,631
ROU lease assets, net	191,068	119,926
Property and equipment, net	430,184	204,557
Depreciation and amortization	$ 41,700	$ 31,400	$ 32,500
Number of locations closed | holding	14
Reduction in real estate	45%
Write-down of real estate	$ 1,800
Loss on disposal of property and equipment	$ 6,300

Premises and Equipment - Disclo

Premises and Equipment - Disclosure of Long Lived Assets Held-for-sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement in Property, Plant and Equipment [Roll Forward]
Balance, beginning of period	$ 490	$ 2,654	$ 0
Transfers from (to) property and equipment	4,800	(38)	2,654
Write-downs	(190)	0	0
Sales	(300)	(2,126)	0
Balance, end of period	$ 4,800	$ 490	$ 2,654

Leasing - Narrative (Details)

Leasing - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Leased assets impairment loss	$ 23.1	$ 1.2	$ 12
Commercial | Equipment financing
Lessee, Lease, Description [Line Items]
Sales-type and direct financing lessor activities	$ 15.4	$ 7.5	$ 7.1
Minimum
Lessee, Lease, Description [Line Items]
Financing leases, term	6 months
Lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Financing leases, term	10 years
Lease term	15 years

Leasing - Summary of Net Invest

Leasing - Summary of Net Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Lease receivables	$ 330,690	$ 196,632
Unguaranteed residual values	100,368	19,748
Total net investment	$ 431,058	$ 216,380

Leasing - Summary of Net Inve_2

Leasing - Summary of Net Investment Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
2023	$ 146,858
2024	91,592
2025	74,522
2026	71,950
2027	27,029
Thereafter	56,598
Total lease payments receivable	468,549
Present value adjustment	(37,491)
Total net investment	$ 431,058	$ 216,380

Leasing - Operating ROU Assets

Leasing - Operating ROU Assets and Lease Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net	Property and equipment, net
ROU lease assets	$ 191,068		$ 119,926
Operating lease liabilities	$ 239,281		$ 144,804
Operating lease liabilities, location	Accrued expenses and other liabilities	Accrued expenses and other liabilities	Accrued expenses and other liabilities

Leasing - Lease Cost (Details)

Leasing - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease, Cost [Abstract]
Operating and variable lease costs	$ 44,654	$ 30,936	$ 35,916
Sublease income	(1,383)	(554)	(557)
Total operating lease expense	43,271	30,382	35,359
Cash paid for amounts included in the measurement of operating lease liabilities	44,767	30,487	31,212
ROU lease assets obtained in exchange for operating lease liabilities	$ 27,897	$ 15,226	$ 9,211
Weighted-average remaining lease term (in years)	7 years 8 months 19 days	7 years 6 months	8 years 14 days
Weighted-average discount rate	2.65%	3.04%	3.19%

Leasing - Maturity of Operating

Leasing - Maturity of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Lessee, Operating Lease, Liability, to be Paid, Rolling Maturity [Abstract]
2023	$ 40,614
2024	40,808
2025	36,274
2026	32,696
2027	27,201
Thereafter	91,369
Total operating lease payments	268,962
Present value adjustment	29,681
Operating lease liabilities	$ 239,281	$ 144,804

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Balance, beginning of period	$ 538,373	$ 538,373
Balance, end of period	2,514,104	538,373
Sterling
Goodwill [Roll Forward]
Goodwill acquired	1,939,765	0
Bend
Goodwill [Roll Forward]
Goodwill acquired	$ 35,966	$ 0

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Gross Carrying Value And Accumulated Amortization Of Other Intangible Assets) (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 2,514,104	$ 538,373	$ 538,373
Gross Carrying Amount		261,037	47,625
Accumulated Amortization		(61,695)	(29,756)
Net Carrying Amount		199,342	17,869
Sterling And Bend
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life	10 years
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		146,037	26,625
Accumulated Amortization		(36,710)	(18,516)
Net Carrying Amount		109,327	8,109
Core Deposits | Sterling And Bend
Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 119,100
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		115,000	21,000
Accumulated Amortization		(24,985)	(11,240)
Net Carrying Amount		$ 90,015	$ 9,760
Customer Relationships | Sterling And Bend
Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 94,000

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 30,362
2021	24,481
2022	21,487
2023	21,487
2024	21,487
Thereafter	$ 80,038

Income Taxes - Income Tax Expen

Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 170,779	$ 109,621	$ 73,172
State and local	52,579	20,374	17,417
Total current	223,358	129,995	90,589
Deferred:
Federal	(45,421)	(9,844)	(23,799)
State and local	(24,243)	4,846	(7,437)
Total deferred	(69,664)	(4,998)	(31,236)
Total:
Total federal	125,358	99,777	49,373
Total state and local	28,336	25,220	9,980
Income tax expense and effective tax rate	$ 153,694	$ 124,997	$ 59,353

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Net tax credits	$ 14,000	$ 2,600	$ 1,100
Benefit from operating loss carryforwards	10,300	400
SALT DTA valuation allowance adjustment, net	(9,874)	0	0
Increase (decrease) in deferred income taxes	262,200
Deferred tax expense (benefit)	(69,664)	(4,998)	(31,236)
Tax benefit directly allocated to shareholder's equity	245,900
Valuation allowance	29,176	37,374
Increase (decrease) in valuation allowance	(8,200)
Unrecognized deferred tax liability for thrift bad-debt reserves	63,200	15,300
Cumulative taxable temporary differences	233,100	58,000
Unrecognized tax benefits that would impact effective tax rate	9,100	3,500	3,500
Interest and penalties	100	300	$ 100
Accrued interest and penalties related to UTBs	2,000	$ 1,900
Bend Financial, Inc.
Operating Loss Carryforwards [Line Items]
Valuation allowance	1,700
Sterling Merger and Bend Acquisition
Operating Loss Carryforwards [Line Items]
Deferred tax liability, net	51,900
SALT
Operating Loss Carryforwards [Line Items]
Valuation allowance	28,600
Deferred tax assets, net operating loss carryforwards subject to expiration	484,400
Federal
Operating Loss Carryforwards [Line Items]
Valuation allowance	600
Deferred tax assets, net operating loss carryforwards subject to expiration	600
SALT
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	1,000,000
Federal
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	21,900
Minimum
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits reasonably possible	700
Maximum
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits reasonably possible	$ 6,800

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at federal statutory rate	$ 167,575	$ 112,111	$ 58,795
SALT expense, net of federal	32,259	19,924	7,884
Tax-exempt interest income, net	(35,371)	(6,814)	(7,181)
Increase in cash surrender value of life insurance	(6,122)	(3,030)	(3,058)
Non-deductible FDIC Deposit insurance premiums	5,581	2,064	2,172
Low income housing tax credits and other benefits, net	(7,627)	(615)	(289)
Non-deductible compensation expense	7,948	786	454
Non-deductible merger-related expenses, excluding compensation	2,717	3,451	0
SALT DTA valuation allowance adjustment, net	(9,874)	0	0
Other, net	(3,392)	(2,880)	576
Income tax expense and effective tax rate	$ 153,694	$ 124,997	$ 59,353
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax expense at federal statutory rate	21%	21%	21%
SALT expense, net of federal	4.10%	3.70%	2.80%
Tax-exempt interest income, net	(4.40%)	(1.30%)	(2.60%)
Increase in cash surrender value of life insurance	(0.80%)	(0.60%)	(1.10%)
Non-deductible FDIC Deposit insurance premiums	0.70%	0.40%	0.80%
Low income housing tax credits and other benefits, net	(1.00%)	(0.10%)	(0.10%)
Non-deductible compensation expense	1%	0.10%	0.20%
Non-deductible merger-related expenses, excluding compensation	0.30%	0.70%	0%
SALT DTA valuation allowance adjustment, net	(1.20%)	0%	0%
Other, net	(0.40%)	(0.50%)	0.20%
Income tax expense and effective tax rate	19.30%	23.40%	21.20%

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
ACL on loans and leases	$ 161,932	$ 78,905
Net operating loss and credit carry forwards	72,035	64,366
Compensation and employee benefit plans	55,093	22,840
Lease liabilities under operating leases	64,899	38,130
Net unrealized loss on AFS securities	233,978	0
Other	38,314	12,790
Gross deferred tax assets	626,251	217,031
Valuation allowance	(29,176)	(37,374)
Total deferred tax assets, net of valuation allowance	597,075	179,657
Deferred tax liabilities:
Net unrealized gain on AFS securities	0	1,885
ROU assets under operating leases	51,822	31,580
Equipment financing leases	74,295	21,193
Goodwill and other intangible assets	56,223	5,690
Purchase accounting and fair value adjustments	11,529	0
Other	31,572	9,904
Gross deferred tax liabilities	225,441	70,252
Deferred tax assets, net	$ 371,634	$ 109,405

Income Taxes - Summary of Posit

Income Taxes - Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 4,249	$ 4,252	$ 4,813
Additions as a result of tax positions taken during the current year	223	294	87
Additions as a result of tax positions taken during prior years	8,807	434	572
Reductions as a result of tax positions taken during prior years	(503)	(186)	(694)
Reductions relating to settlements with taxing authorities	(2,110)	(267)	(130)
Reductions as a result of lapse of statute of limitation periods	(791)	(278)	(396)
Ending balance	$ 9,875	$ 4,249	$ 4,252

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deposit Liabilities [Abstract]
Demand	$ 12,974,975	$ 7,060,488
Health Savings Accounts	7,944,892	7,397,582
Checking	9,237,529	4,182,497
Money market	11,062,652	3,718,953
Savings	8,673,343	5,689,739
Time deposits	4,160,949	1,797,770
Total interest-bearing	41,079,365	22,786,541
Total deposits	54,054,340	29,847,029
Time deposits and interest-bearing checking, included in above balances, obtained through brokers	1,964,873	120,392
Time deposits, included in above balance, that exceed the FDIC limit	1,894,950	256,522
Demand deposit overdrafts reclassified as loan balances	$ 8,721	$ 1,577

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deposit Liabilities [Abstract]
2020	$ 3,754,386
2021	181,790
2022	129,775
2023	55,102
2024	39,896
Thereafter	0
Total time deposits	$ 4,160,949	$ 1,797,770

Borrowings Borrowings - (Narrat

Borrowings Borrowings - (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 31, 2022	Oct. 30, 2020	Dec. 16, 2019
Subordinated Notes Due 2029 | Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.53%
Subordinated Notes Due 2030 | Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.69%
Sterling
Debt Instrument [Line Items]
Aggregate principal amount		$ 3,240,535	$ 225,000	$ 274,000
Fixed-to-floating rate			3.875%	4%
Long-term debt		516,881
Sterling | Subordinated Notes Due 2029 | Subordinated Debt
Debt Instrument [Line Items]
Long-term debt		281,000
Sterling | Subordinated Notes Due 2030 | Subordinated Debt
Debt Instrument [Line Items]
Long-term debt		$ 235,900

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Total securities sold under agreements to repurchase	$ 282,005	$ 674,896
Fed funds purchased	869,825	0
Securities sold under agreements to repurchase and other borrowings	$ 1,151,830	674,896
Amount Of Extinguished Debt Agreements | loan	2
Extinguishment of Debt, Amount	$ 100,000
Gain (Loss) on Extinguishment of Debt	2,500
Original maturity of one year or less [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Total securities sold under agreements to repurchase	282,005	474,896
Original maturity of greater than one year, non-callable [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Total securities sold under agreements to repurchase	$ 0	$ 200,000
Securities Sold under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Rate (as a percent)	0.11%	0.47%
Securities Sold under Agreements to Repurchase [Member] | Original maturity of one year or less [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Rate (as a percent)	0.11%	0.11%
Securities Sold under Agreements to Repurchase [Member] | Original maturity of greater than one year, non-callable [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Rate (as a percent)	0%	1.32%
Federal Funds Purchased [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Rate (as a percent)	4.44%	0%
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Rate (as a percent)	3.38%	0.47%

Borrowings (Summary Of Advances

Borrowings (Summary Of Advances Payable To The Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Weighted-Average Contractual Coupon Rate (as a percent)	4.40%	0%
FHLB advances maturing after 1 but within 2 years, Weighted-Average Contractual Coupon Rate (as a percent)	0%	2.95%
FHLB advances maturing after 2 but within 3 years, Weighted-Average Contractual Coupon Rate (as a percent)	0%	0%
FHLB advances maturing after 3 but within 4 years, Weighted-Average Contractual Coupon Rate (as a percent)	0%	0%
FHLB advances maturing after 4 but within 5 years, Weighted-Average Contractual Coupon Rate (as a percent)	0%	0%
FHLB advances maturing after 5 years, Weighted-Average Contractual Coupon Rate (as a percent)	2.09%	2.03%
Federal Home Loan Bank, Advances, Weighted Average Interest Rate (as a percent)	4.39%	2.03%
Aggregate carrying value of assets pledged as collateral	$ 13,692,379	$ 7,556,034
Remaining borrowing capacity	4,291,326	5,087,294
FHLB advances maturing within 1 year, Total Outstanding	5,450,187	90
FHLB advances maturing after 1 but within 2 years, Total Outstanding	0	202
FHLB advances maturing after 2 but within 3 years, Total Outstanding	0	0
FHLB advances maturing after 3 but within 4 years, Total Outstanding	0	0
FHLB advances maturing after 4 but within 5 years, Total Outstanding	252	0
FHLB advances maturing after 5 years, Total Outstanding	10,113	10,705
FHLB advances	$ 5,460,552	$ 10,997

Borrowings (Long-Term Debt) (De

Borrowings (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Notes and subordinated debt	$ 1,059,778	$ 566,131
Debt issuance cost on senior fixed-rate notes	(1,824)	(2,226)
Long-term debt	$ 1,073,128	$ 562,931
Long term debt, variable interest rate, percentage	7.69%	3.17%
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		$ 38,811
Subordinated Debt
Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium	$ 15,930	0
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate spread of LIBOR plus (as a percent)	2.95%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 77,320	77,320
Long-term Debt [Member]
Debt Instrument [Line Items]
Discount on senior fixed-rate notes	(756)	(974)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	33,500	38,800
Subordinated Notes Due 2029 | Subordinated Debt
Debt Instrument [Line Items]
Long-Term Debt, Gross	274,000	0
Subordinated Notes Due 2030 | Subordinated Debt
Debt Instrument [Line Items]
Long-Term Debt, Gross	225,000	0
Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 150,000	150,000
Debt instrument, stated interest rate, percentage	4.375%
Debt Instrument, Redemption, Period Two | Senior Notes [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 333,458	$ 338,811
Debt instrument, stated interest rate, percentage	4.10%

Stockholders' Equity - Class of

Stockholders' Equity - Class of Stock Disclosure (Details) - shares		12 Months Ended
	Jan. 31, 2022	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Outstanding, beginning balance (in shares)		90,583,621
Issued in business combination (in shares)		89,091,734
Contributions to charitable foundation (in shares)		(242,270)
Employee stock compensation plan activity (in shares)		(458,881)
Stock options exercised (in shares)		(30,355)
Common stock repurchase program (in shares)		6,399,288
Common Stock Outstanding, ending balance (in shares)		174,007,573
Sterling
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	87,965,239
Preferred Stock Series F Issued
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance (in shares)		6,000
Issued in business combination (in shares)		0
Contributions to charitable foundation (in shares)		0
Employee stock compensation plan activity (in shares)		0
Stock options exercised (in shares)		0
Common stock repurchase program (in shares)		0
Shares, ending balance (in shares)		6,000
Preferred Stock Series G Issued
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance (in shares)		0
Issued in business combination (in shares)		135,000
Contributions to charitable foundation (in shares)		0
Employee stock compensation plan activity (in shares)		0
Stock options exercised (in shares)		0
Common stock repurchase program (in shares)
Shares, ending balance (in shares)		135,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, beginning balance (in shares)		93,686,311
Issued in business combination (in shares)		89,091,734
Contributions to charitable foundation (in shares)		0
Employee stock compensation plan activity (in shares)		0
Stock options exercised (in shares)		0
Common stock repurchase program (in shares)		0
Shares, ending balance (in shares)		182,778,045
Common Stock | Sterling
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued (in shares)	1,126,495
Treasury Stock Held
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock Held, beginning balance (in shares)		3,102,690
Issued in business combination (in shares)		0
Contributions to charitable foundation (in shares)		(242,270)
Employee stock compensation plan activity (in shares)		(458,881)
Stock options exercised (in shares)		(30,355)
Common stock repurchase program (in shares)		6,399,288
Treasury Stock Held, ending balance (in shares)		8,770,472

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Jan. 31, 2022 $ / shares shares	Dec. 12, 2017 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 $ / shares shares	Apr. 19, 2021 shares
Class of Stock [Line Items]
Stock repurchase program, authorized amount | $			$ 600,000
Treasury stock acquired, average cost per share (in usd per share)			$ 50.33
Treasury stock acquired, value | $			$ 322,100
Stock repurchase program, remaining authorized repurchase amount | $		$ 6,000	$ 401,300
Preferred stock, shares authorized | shares			3,000,000	3,000,000
Depositary shares, ownership of preferred shares			0.001
Value per share (in dollars per share)			$ 0.01	$ 0.01
Employee Stock Compensation Plan
Class of Stock [Line Items]
Treasury stock acquired, average cost per share (in usd per share)			$ 56.90
Treasury stock acquired, value | $			$ 23,600
Sterling
Class of Stock [Line Items]
Preferred stock, shares authorized | shares	400,000,000				200,000,000
Preferred Stock Series F Issued
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)		5.25%
Value per share (in dollars per share)		$ 0.01
Preferred stock, liquidation preference per share (in usd per share)		$ 25,000
Preferred Stock Series G Issued
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)			6.50%
Value per share (in dollars per share)	$ 0.01
Preferred stock, liquidation preference per share (in usd per share)	$ 1,000
Depositary shares issued (in shares) | shares	5,400,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 3,438,325	$ 3,234,625	$ 3,207,770
Other comprehensive (loss) income, net of tax	(662,380)	(64,836)	78,328
Ending Balance	8,056,186	3,438,325	3,234,625
Available For Sale and Transferred Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	4,536	67,424	17,251
Other comprehensive (loss) before reclassifications	(640,656)	(62,888)	50,179
Amounts reclassified from accumulated other comprehensive loss	4,960	0	(6)
Other comprehensive (loss) income, net of tax	(635,696)	(62,888)	50,173
Ending Balance	(631,160)	4,536	67,424
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	6,070	19,918	(9,184)
Other comprehensive (loss) before reclassifications	(17,810)	(17,109)	20,667
Amounts reclassified from accumulated other comprehensive loss	2,866	3,261	8,435
Other comprehensive (loss) income, net of tax	(14,944)	(13,848)	29,102
Ending Balance	(8,874)	6,070	19,918
Defined Benefit Pension and Postretirement Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(33,186)	(45,086)	(44,139)
Other comprehensive (loss) before reclassifications	(13,350)	8,876	(3,887)
Amounts reclassified from accumulated other comprehensive loss	1,610	3,024	2,940
Other comprehensive (loss) income, net of tax	(11,740)	11,900	(947)
Ending Balance	(44,926)	(33,186)	(45,086)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(22,580)	42,256	(36,072)
Other comprehensive (loss) before reclassifications	(671,816)	(71,121)	66,959
Amounts reclassified from accumulated other comprehensive loss	9,436	6,285	11,369
Other comprehensive (loss) income, net of tax	(662,380)	(64,836)	78,328
Ending Balance	$ (684,960)	$ (22,580)	$ 42,256

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Reclassifications from AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net loss (gain) on sale of investment securities	$ (6,751)	$ 0	$ 8
Interest expense	(250,451)	(41,755)	(110,656)
Interest income	2,284,737	942,844	1,002,049
Income tax expense	(153,694)	(124,997)	(59,353)
Earnings applicable to common shareholders	622,692	398,687	211,474
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest [Member] | Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net loss (gain) on sale of investment securities	(6,751)	0	8
Available For Sale and Transferred Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(4,960)	0	6
Available For Sale and Transferred Securities [Member] | Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	1,791	0	(2)
Earnings applicable to common shareholders	(4,960)	0	6
Derivative Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(2,866)	(3,261)	(8,435)
Derivative Instruments | Reclassification out of accumualted comprehensive income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(306)	(306)	(7,884)
Interest income	(3,626)	(4,109)	(3,536)
Income tax expense	1,066	1,154	2,985
Earnings applicable to common shareholders	(2,866)	(3,261)	(8,435)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(2,210)	(4,102)	(3,976)
Defined benefit pension and postretirement benefit plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	600	1,078	1,036
Net of tax	$ (1,610)	$ (3,024)	$ (2,940)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale securities:
Net unrealized loss during the period	$ (878,366)	$ (85,368)	$ 68,116
Reclassification for net gain included in net income	6,751		(8)
Total available-for-sale securities	(871,615)	(85,368)	68,108
Derivative instruments:
Net unrealized (losses) arising during the year	(24,440)	(23,216)	27,683
Reclassification adjustment for net realized losses included in net income	3,932	4,415	11,420
Total derivative instruments	(20,508)	(18,801)	39,103
Defined benefit pension and other postretirement benefit plans:
Net actuarial (loss) arising during the year	(18,319)	12,052	(5,262)
Reclassification adjustment for amortization of net loss included in net income	2,210	4,102	3,976
Total loss (gain) recognized in (OCL) OCI	16,109	(16,154)	1,286
Available-for-sale securities:
Net unrealized loss during the period	237,710	22,480	(17,937)
Reclassification for net gain included in net income	1,791		(2)
Total investment securities available-for-sale	(235,919)	(22,480)	17,935
Derivative instruments:
Net unrealized (losses) arising during the year	6,630	6,107	(7,016)
Reclassification adjustment for net realized losses included in net income	(1,066)	(1,154)	(2,985)
Total derivative instruments	5,564	4,953	(10,001)
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	4,969	(3,176)	1,375
Reclassification adjustment for amortization of net loss included in net income	(600)	(1,078)	(1,036)
Total defined benefit pension and postretirement benefit plans	4,369	(4,254)	339
Available-for-sale securities:
Net unrealized loss during the period	(640,656)	(62,888)	50,179
Reclassification for net gain included in net income	4,960		(6)
Total available-for-sale securities	(635,696)	(62,888)	50,173
Derivative instruments:
Net unrealized (losses) arising during the year	(17,810)	(17,109)	20,667
Reclassification adjustment for net realized losses included in net income	2,866	3,261	8,435
Total derivative instruments	(14,944)	(13,848)	29,102
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	(13,350)	8,876	(3,887)
Reclassification adjustment for amortization of net loss included in net income	1,610	3,024	2,940
Total defined benefit pension and postretirement benefit plans	(11,740)	11,900	(947)
Other Comprehensive Income (Loss), Pre-Tax Amount	(908,232)	(88,015)	105,925
Other Comprehensive Income (Loss), Tax Benefit (Expense)	245,852	23,179	(27,597)
Other comprehensive (loss) income, net of tax	$ (662,380)	$ (64,836)	$ 78,328

Regulatory Matters (Information

Regulatory Matters (Information On The Capital Ratios) (Detail) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 5,822,369	$ 2,804,290
Common Equity Tier One Capital Required for Capital Adequacy	$ 2,446,344	$ 1,076,871
Common Equity Tier One Capital Ratio	0.1071	0.1172
Common Equity Tier One Capital Required to be Well-Capitalized	$ 3,533,608	$ 1,555,480
Total risk-based capital, Actual Amount	$ 7,203,029	$ 3,265,064
Total risk-based capital, Actual Ratio	0.1325	0.1364
Total risk-based capital, Capital Requirements, Minimum Amount	$ 4,349,056	$ 1,914,436
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080	0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 5,436,320	$ 2,393,046
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100	0.100
Tier 1 risk-based capital, Actual Amount	$ 6,106,348	$ 2,949,327
Tier 1 risk-based capital, Actual Ratio	0.1123	0.1232
Tier 1 risk-based capital, Capital Requirements, Minimum Amount	$ 3,261,792	$ 1,435,827
Tier 1 risk-based capital, Capital Requirements, Minimum Ratio	0.060	0.060
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Amount	$ 4,349,056	$ 1,914,436
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Ratio	0.080	0.080
Tier 1 leverage capital, Actual Amount	$ 6,106,348	$ 2,949,327
Tier 1 leverage capital, Actual Ratio	0.0895	0.0847
Tier 1 leverage capital, Capital Requirements, Minimum Amount	$ 2,730,212	$ 1,393,607
Tier 1 leverage capital, Capital Requirements, Minimum Ratio	0.040	0.040
Tier 1 leverage capital, Capital Requirements, Well Capitalized Amount	$ 3,412,765	$ 1,742,008
Tier 1 leverage capital, Capital Requirements, Well Capitalized Ratio	0.050	0.050
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 6,661,504	$ 3,034,883
Common Equity Tier One Capital Required for Capital Adequacy	$ 2,442,058	$ 1,075,920
Common Equity Tier One Capital Ratio	0.1228	0.1269
Common Equity Tier One Capital Required to be Well-Capitalized	$ 3,527,417	$ 1,554,107
Total risk-based capital, Actual Amount	$ 7,165,935	$ 3,273,300
Total risk-based capital, Actual Ratio	0.1320	0.1369
Total risk-based capital, Capital Requirements, Minimum Amount	$ 4,341,437	$ 1,912,747
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080	0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 5,426,796	$ 2,390,934
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100	0.100
Tier 1 risk-based capital, Actual Amount	$ 6,661,504	$ 3,034,883
Tier 1 risk-based capital, Actual Ratio	0.1228	0.1269
Tier 1 risk-based capital, Capital Requirements, Minimum Amount	$ 3,256,078	$ 1,434,560
Tier 1 risk-based capital, Capital Requirements, Minimum Ratio	0.060	0.060
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Amount	$ 4,341,437	$ 1,912,747
Tier 1 risk-based capital, Capital Requirements, Well Capitalized Ratio	0.080	0.080
Tier 1 leverage capital, Actual Amount	$ 6,661,504	$ 3,034,883
Tier 1 leverage capital, Actual Ratio	0.0977	0.0872
Tier 1 leverage capital, Capital Requirements, Minimum Amount	$ 2,727,476	$ 1,392,821
Tier 1 leverage capital, Capital Requirements, Minimum Ratio	0.040	0.040
Tier 1 leverage capital, Capital Requirements, Well Capitalized Amount	$ 3,409,345	$ 1,741,026
Tier 1 leverage capital, 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

Regulatory Matters Regulatory M

Regulatory Matters Regulatory Matters - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid to parent company	$ 475	$ 200

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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share Reconciliation [Abstract]
Net income	$ 644,283	$ 408,864	$ 220,621
Less: Preferred stock dividends	15,919	7,875	7,875
Net income available to common shareholders, basic	628,364	400,989	212,746
Net income available to common shareholders, diluted	628,364	400,989	212,746
Less: Earnings applicable to participating securities, basic	5,672	2,302	1,272
Less: Earnings applicable to participating securities, diluted	5,672	2,302	1,272
Earnings applicable to common shareholders	622,692	398,687	211,474
Earnings applicable to common shareholders, diluted	$ 622,692	$ 398,687	$ 211,474
Earnings per common share:
Earnings per common share, Basic (in dollars per share)	$ 3.72	$ 4.43	$ 2.35
Earnings per common share, Diluted (in dollars per share)	$ 3.72	$ 4.42	$ 2.35
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average common shares outstanding - basic	167,452	89,983	89,967
Stock options and restricted stock (in shares)	95	223	184
Weighted Average Number of Shares Outstanding, Diluted	167,547	90,206	90,151

Earnings Per Common Share (Sche

Earnings Per Common Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	176,177	56,829	43,508

Derivative Financial Instrume_2

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	$ 8,539,724,000	$ 5,554,015,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	222,906,000	159,117,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Asset Derivatives, Fair Value, Less: Cash collateral posted	184,095,000	19,272,000
Derivative asset	22,682,000	133,481,000
Liability Derivatives, Notional Amount	9,379,322,000	4,747,534,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	414,499,000	21,784,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Liability Derivatives, Fair Value, Less: Cash collateral posted	$ 0	$ 2,119,000
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true	true
Derivative liability	$ 398,370,000	$ 13,301,000
CME SWAPS MARKETS (CME) [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Less: Cash collateral posted	59,200,000
Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	125,600,000	66,000,000
Liability Derivatives, Notional Amount	559,200,000	338,200,000
CME
Derivatives, Fair Value [Line Items]
Derivative asset	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	217,246,000	25,636,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Derivative asset	184,095,000	19,272,000
Derivative Liability, Fair Value, Gross Liability	16,129,000	8,483,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Derivative liability	0	2,119,000
Designated as Hedging Instrument [Member] | Interest rate derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	1,350,000,000	1,000,000,000
Derivative Asset, Fair Value, Gross Asset	1,515,000	17,583,000
Liability Derivatives, Notional Amount	1,750,000,000	0
Derivative Liability, Fair Value, Gross Liability	9,632,000	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	7,189,724,000	4,554,015,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement	221,391,000	141,534,000
Liability Derivatives, Notional Amount	7,629,322,000	4,747,534,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement	404,867,000	21,784,000
Not Designated as Hedging Instrument [Member] | Interest rate derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	7,024,507,000	4,463,048,000
Derivative Asset, Fair Value, Gross Asset	221,225,000	141,243,000
Liability Derivatives, Notional Amount	7,022,844,000	4,372,846,000
Derivative Liability, Fair Value, Gross Liability	403,952,000	21,570,000
Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives [Member] | RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	3,283,000	14,212,000
Derivative Asset, Fair Value, Gross Asset	32,000	80,000
Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives [Member] | RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	161,934,000	76,755,000
Derivative Asset, Fair Value, Gross Asset	134,000	211,000
Liability Derivatives, Notional Amount	606,478,000	374,688,000
Derivative Liability, Fair Value, Gross Liability	915,000	214,000
Not Designated as Hedging Instrument [Member] | CME SWAPS MARKETS (CME) [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	2,700,000,000	400,000,000
Liability Derivatives, Notional Amount	0	2,600,000,000
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Other Commitment	$ 2,400,000	$ 1,000,000

Derivative Financial Instrume_3

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative instrument asset, Amount Offset, Total	$ (16,129)	$ (6,364)
Derivative instrument asset, Amount Offset	184,095	19,272
Derivative asset	22,682	133,481
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129	6,364
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	(2,119)
Derivative liability	398,370	13,301
Derivative Credit Risk Valuation Adjustment, Derivative Assets	8,400
Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	217,246	25,636
Derivative instrument asset, Amount Offset, Total	(16,129)	(6,364)
Derivative asset	184,095	19,272
Derivative Liability, Fair Value, Gross Liability	16,129	8,483
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129	6,364
Derivative liability	0	2,119
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(17,022)	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	0
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	17,392	51
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	1,545	428
Interest Rate Derivatives [Member] | Hedge Accounting Positions [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,515	17,583
Derivative Liability, Fair Value, Gross Liability	$ 9,632	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments Impact of Fair Value on Qualifying Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ 10,471	$ 10,008
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		38,811
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 1,629	10,265	(1,833)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	28,293
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	25,092	10,369	11,068
Interest rate derivatives [Member] | Operating Expense [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	306	411	8,206
Interest rate derivatives [Member] | Other Income [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	1,935	10,676	6,373
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	(48)	(776)	636
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	3,249	878	$ (1,696)
Long-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Liability, Fair Value Hedge	333,458	$ 338,811
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 33,458

Derivative Financial Instrume_5

Derivative Financial Instruments (Schedule of the changes in the fair value of non-hedge accounting derivatives) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ 10,471	$ 10,008
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 28,293
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	25,092	10,369	11,068
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	(48)	(776)	636
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	3,249	878	(1,696)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	1,629	10,265	(1,833)
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	306	411	8,206
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	$ 1,935	$ 10,676	$ 6,373

Derivative Financial Instrume_6

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unamortized gain (loss) on termination of cash flow hedges	$ 300
Price Risk Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unamortized gain (loss)	2,800
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ 3,500
Maximum Length of Time Hedged in Cash Flow Hedge	4 years 3 months 18 days
Remaining unamortized gain (loss)	$ 300

Derivative Financial Instrume_7

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 184,095	$ 19,272
Credit Derivative, Maximum Exposure, Undiscounted	5,600
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		$ (400)
Valuation, Cost Approach [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	185,600
Valuation, Market Approach [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	95,300
CME SWAPS MARKETS (CME) [Member]
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 59,200

Derivative Financial Instrume_8

Derivative Financial Instruments Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 16,129	$ 6,364
Derivative Asset	22,682	133,481
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129	6,364
Derivative Liability	398,370	13,301
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	16,129	8,483
Derivative Asset, Fair Value, Gross Asset	217,246	25,636
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,129	6,364
Derivative Asset	184,095	19,272
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129	6,364
Derivative Liability	0	2,119
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	17,022	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 0	$ 0

Fair Value Measurements Fair va

Fair Value Measurements Fair value Option, Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 1,991	$ 4,694
Unpaid Principal Balance	1,991	4,694
Difference	360	(340)
loans held for sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid Principal Balance	$ 1,631	$ 5,034

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused Commitments to Extend Credit	$ 11,671,663	$ 7,152,331
Mortgage Loans in Process of Foreclosure, Amount	10,100
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount	(200)
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	1,000
Rabbi Trust [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	10,000	1,600
Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	82,700	14,100
Equity Securities, FV-NI	400	1,900
Equity Securities without Readily Determinable Fair Value, Amount	89,200	25,900
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,500
Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	2,300	2,800
Fair Value, Nonrecurring [Member] | Alternative investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused Commitments to Extend Credit	42,800	25,800
Alternative investments, written up	$ 5,900	$ 5,800

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring Basis) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	$ 22,682	$ 133,481
Loans Held-for-sale, Fair Value Disclosure	$ 1,991	4,694
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true
Derivative liability	$ 398,370	13,301
Fair Value	7,892,697	4,234,854
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	7,892,697	4,234,854
Alternative Investment	89,678	27,732
Assets, Fair Value Disclosure	8,219,375	4,429,813
Derivative liability	414,499	21,784
Fair Value, Recurring [Member] | Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	222,906	159,117
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	717,040	396,966
Alternative Investment	430	1,877
Assets, Fair Value Disclosure	729,652	402,446
Derivative liability	843	141
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	79	187
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	7,175,657	3,837,888
Alternative Investment	0	0
Assets, Fair Value Disclosure	7,400,475	4,001,512
Derivative liability	413,656	21,643
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	222,827	158,930
Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Alternative Investment	0	0
Assets, Fair Value Disclosure	0	0
Derivative liability	0	0
Fair Value, Recurring [Member] | Level 3 | Derivative instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Investments held In Rabbi Trust [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	12,103	3,416
Investments held In Rabbi Trust [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	12,103	3,416
Investments held In Rabbi Trust [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0	0
Investments held In Rabbi Trust [Member] | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0	0
Loan Origination Commitments [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	1,991	4,694
Loan Origination Commitments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Loan Origination Commitments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	1,991	4,694
Loan Origination Commitments [Member] | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
US Treasury and Government | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	717,040	396,966
US Treasury and Government | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	717,040	396,966
US Treasury and Government | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
US Treasury and Government | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Agency CMO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	59,965	90,384
Agency CMO | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	59,965	90,384
Agency CMO | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Agency CMO | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	59,965	90,384
Agency CMO | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Agency MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,158,024	1,593,403
Agency MBS | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	2,158,024	1,593,403
Agency MBS | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Agency MBS | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	2,158,024	1,593,403
Agency MBS | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Agency commercial mortgage-backed securities (agency CMBS) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,406,486	1,232,541
Agency commercial mortgage-backed securities (agency CMBS) [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	1,406,486	1,232,541
Agency commercial mortgage-backed securities (agency CMBS) [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Agency commercial mortgage-backed securities (agency CMBS) [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	1,406,486	1,232,541
Agency commercial mortgage-backed securities (agency CMBS) [Member] | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	896,640	886,263
CMBS | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	896,640	886,263
CMBS | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
CMBS | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	896,640	886,263
CMBS | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
CLO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,107	21,847
CLO | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	2,107	21,847
CLO | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
CLO | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	2,107	21,847
CLO | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	704,412	13,450
Corporate debt | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	704,412	13,450
Corporate debt | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Corporate debt | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	704,412	13,450
Corporate debt | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	$ 0
Government agency debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	258,374
Government agency debentures | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	258,374
Government agency debentures | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Government agency debentures | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	258,374
Government agency debentures | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Municipal bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,633,202
Municipal bonds and notes | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,633,202
Municipal bonds and notes | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Municipal bonds and notes | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,633,202
Municipal bonds and notes | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Private label MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	44,249
Private label MBS | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	44,249
Private label MBS | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Private label MBS | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	44,249
Private label MBS | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	12,198
Other | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	12,198
Other | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Other | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	12,198
Other | Fair Value, Recurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 0

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held to maturity securities	$ 6,564,879	$ 6,198,339
Debt Securities, Held-to-maturity, Fair Value	5,761,453	6,280,936
Mortgage servicing assets, Carrying Amount	9,515	9,237	$ 13,422	$ 17,484
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	839,943	461,570
Held to maturity securities	6,564,697	6,198,125
Loans and leases, net	49,169,685	21,970,542
Securities sold under agreements to repurchase and other borrowings	1,151,830	674,896
FHLB advances	5,460,552	10,997
Long-term debt	1,073,128	562,931
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Deposits other than time deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits	49,893,391	28,049,259
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits	4,160,949	1,797,770
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing assets, Carrying Amount	9,515	9,237
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	839,943	461,570
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Held-to-maturity, Fair Value	5,761,453	6,280,936
Securities sold under agreements to repurchase and other borrowings	1,151,797	676,581
FHLB advances	5,459,218	11,490
Long-term debt	1,001,779	515,912
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Deposits other than time deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits	49,893,391	28,049,259
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits	4,091,979	1,794,829
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, net	47,604,463	21,702,732
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Nonrecurring [Member] | Residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing assets	$ 27,043	$ 12,527

Retirement Benefit Plans - Narr

Retirement Benefit Plans - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jul. 01, 2021
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return on Plan Assets	5.50%
Shortfall amortization period	7 years
Funded status of plan				$ 2.1
Sterling National Bank 401k And Profit Sharing Plan
Defined Benefit Plan Disclosure [Line Items]
Employee annual contribution percent of eligible compensation	50%
Employer matching contribution, percent of match	50%
Maximum employee contributions of eligible compensation	4%
Maximum match	2%
Profit sharing contribution	3%
Salary deferral contributions automatic increase	1%
Salary maximum deferral contributions automatic increase	10%
Compensation expense	$ 18.2	$ 13.1	$ 13.8
Webster Bank Retirement Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Employee annual contribution percent of eligible compensation	75%
Employer matching contribution, percent of match	100%
Employer matching contribution, percent of employees' gross pay	2%
Employer matching contribution, additional percent of match	50%
Employer additional matching contribution, percent of employees' gross pay	6%
Employer additional matching contribution, percent of employees' gross pay, default	3%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage	64.50%
Actual asset allocation percentages	63.80%
Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage	35.50%
Actual asset allocation percentages	35.40%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation percentages	0.80%

Retirement Benefit Plans - Chan

Retirement Benefit Plans - Changes in Plan Assets and Funded Status of Pension Plans and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jul. 01, 2021
Change in plan assets:
Beginning balance	$ 271,846
Ending balance	201,382	$ 271,846
Funded status of the plan at year end				$ 2,100
Pension
Change in benefit obligation:
Beginning balance	250,263	266,414
Service cost	0	0	$ 0
Interest cost	5,565	4,663	6,511
Actuarial (gain) loss	(57,751)	(11,131)
Benefits and administrative expenses paid	(10,241)	(9,683)
Benefit obligation assumed from Sterling	0	0
Ending balance	187,836	250,263	266,414
Change in plan assets:
Beginning balance	271,846	266,268
Actual return on plan assets	(60,223)	15,261
Employer contributions	0	0
Benefits paid	(10,241)	(9,683)
Ending balance	201,382	271,846	266,268
Funded status of the plan at year end	13,546	21,583
SERP
Change in benefit obligation:
Beginning balance	1,873	2,046
Service cost	0	0	0
Interest cost	107	30	46
Actuarial (gain) loss	(581)	(77)
Benefits and administrative expenses paid	(1,671)	(126)
Benefit obligation assumed from Sterling	4,517	0
Ending balance	4,245	1,873	2,046
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	1,671	126
Benefits paid	(1,671)	(126)
Ending balance	0	0	0
Funded status of the plan at year end	(4,245)	(1,873)
OPEB
Change in benefit obligation:
Beginning balance	1,904	1,998
Service cost	34	0	0
Interest cost	652	19	46
Actuarial (gain) loss	(4,992)	32
Benefits and administrative expenses paid	(806)	(145)
Benefit obligation assumed from Sterling	26,030	0
Ending balance	22,822	1,904	1,998
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	806	145
Benefits paid	(806)	(145)
Ending balance	0	0	$ 0
Funded status of the plan at year end	$ (22,822)	$ (1,904)

Retirement Benefit Plans - Weig

Retirement Benefit Plans - Weighted Average Assumptions used to Determine Benefit Obligations (Details)	Dec. 31, 2022	Dec. 31, 2021
Pension | Webster Bank Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.96%	2.65%
SERP | Webster Bank Supplemental Defined Benefit Plan for Executive Officers
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.88%	2.45%
SERP | Astoria Bank Excess Benefit and Supplemental Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.77%
SERP | Astoria Bank Directors' Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.70%
SERP | Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.70%
SERP | Supplemental Executive Retirement Plan of Provident Bank
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	5.04%
SERP | Supplemental Executive Retirement Plan of Provident Bank - Other
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.90%
OPEB | Webster Bank Postretirement Medical Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.72%	1.99%
OPEB | Sterling Bancorp Supplemental Postretirement Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.70%
OPEB | Astoria Bank Postretirement Welfare Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.94%
OPEB | Split Dollar Life Insurance Arrangement
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.63%

Retirement Benefit Plans - Summ

Retirement Benefit Plans - Summary of Components of Accumulated Other Comprehensive Loss Related to Pensions and Postretirement Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 56,717	$ 41,792
Deferred tax benefit (expense)	15,383	8,636
Net amount recorded in (AOCL) AOCI	41,334	33,156
SERP
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	50	658
Deferred tax benefit (expense)	14	136
Net amount recorded in (AOCL) AOCI	36	522
OPEB
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(5,573)	(620)
Deferred tax benefit (expense)	(1,512)	(128)
Net amount recorded in (AOCL) AOCI	$ (4,061)	$ (492)

Retirement Benefit Plans - Su_2

Retirement Benefit Plans - Summary of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	5,565	4,663	6,511
Expected return on plan assets	(14,675)	(14,385)	(13,522)
Amortization of actuarial loss (gain)	2,224	4,102	4,027
Net periodic benefit cost (benefit)	(6,886)	(5,620)	(2,984)
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	107	30	46
Expected return on plan assets	0	0	0
Amortization of actuarial loss (gain)	26	38	23
Net periodic benefit cost (benefit)	133	68	69
OPEB
Defined Benefit Plan Disclosure [Line Items]
Service cost	34	0	0
Interest cost	652	19	46
Expected return on plan assets	0	0	0
Amortization of actuarial loss (gain)	(40)	(38)	(74)
Net periodic benefit cost (benefit)	$ 646	$ (19)	$ (28)

Retirement Benefit Plans - We_2

Retirement Benefit Plans - Weighted Average Assumptions used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2033	Dec. 31, 2030
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return on Plan Assets	5.50%
Forecast
Defined Benefit Plan Disclosure [Line Items]
Cost trend rate				4.75%	4.40%
Pension | Webster Bank Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.65%	2.29%	3.07%
Expected Long-Term Rate of Return on Plan Assets	5.50%	5.50%	5.75%
SERP | Webster Bank Supplemental Defined Benefit Plan for Executive Officers
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.45%	1.91%	2.82%
SERP | Astoria Bank Excess Benefit and Supplemental Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.58%
SERP | Astoria Bank Directors' Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.23%
SERP | Retirement Plan of the Greater New York Savings Bank for Non-Employee Directors
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.37%
SERP | Supplemental Executive Retirement Plan of Provident Bank
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.76%
SERP | Supplemental Executive Retirement Plan of Provident Bank - Other
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.38%
OPEB | Webster Bank Postretirement Medical Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	1.99%	1.40%	2.50%
Assumed Healthcare Cost Trend Rate	6.25%	6.50%	6.50%
OPEB | Sterling Bancorp Supplemental Postretirement Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.35%
OPEB | Astoria Bank Postretirement Welfare Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.93%
Assumed Healthcare Cost Trend Rate	6.60%
OPEB | Split Dollar Life Insurance Arrangement
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	2.20%

Retirement Benefit Plans - Ch_2

Retirement Benefit Plans - Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial loss (gain)	$ 18,319	$ (12,052)	$ 5,262
Amounts reclassified from (AOCL) AOCI	(2,210)	(4,102)	(3,976)
Total loss (gain) recognized in (OCL) OCI	16,109	(16,154)	1,286
Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial loss (gain)	17,148	(12,008)	5,375
Amounts reclassified from (AOCL) AOCI	(2,224)	(4,102)	(4,027)
Total loss (gain) recognized in (OCL) OCI	14,924	(16,110)	1,348
SERP
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial loss (gain)	(581)	(77)	194
Amounts reclassified from (AOCL) AOCI	(26)	(38)	(23)
Total loss (gain) recognized in (OCL) OCI	(607)	(115)	171
OPEB
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial loss (gain)	(4,992)	33	(307)
Amounts reclassified from (AOCL) AOCI	40	38	74
Total loss (gain) recognized in (OCL) OCI	$ (4,952)	$ 71	$ (233)

Retirement Benefit Plans - Expe

Retirement Benefit Plans - Expected Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Pension
Defined Benefit Plan Disclosure [Line Items]
2023	$ 10,224
2024	10,804
2025	11,236
2026	11,644
2027	12,046
Thereafter	63,884
SERP
Defined Benefit Plan Disclosure [Line Items]
2023	475
2024	478
2025	460
2026	440
2027	419
Thereafter	1,724
OPEB
Defined Benefit Plan Disclosure [Line Items]
2023	2,850
2024	2,669
2025	2,522
2026	2,330
2027	2,153
Thereafter	$ 7,800

Retirement Benefit Plans - Su_3

Retirement Benefit Plans - Summary of Fair Value of Plan Assets by Level (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 201,382	$ 271,846
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	28,441	40,923
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	172,941	230,923
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	172,941	230,923
Common collective trusts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Common collective trusts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	172,941	230,923
Common collective trusts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Registered investment companies
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	26,923	39,082
Registered investment companies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	26,923	39,082
Registered investment companies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Registered investment companies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,518	1,841
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,518	1,841
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 0	$ 0

Retirement Benefit Plans - Cont

Retirement Benefit Plans - Contributions and Funding Status of the Fund (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Contributions by Webster Bank	$ 448	$ 692	$ 998
Multiemployer Plan, Pension, Significant, Funded Status [Fixed List]	At least 80 percent	At least 80 percent

Share-Based Plans - Narrative (

Share-Based Plans - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	17,400,000
Number of common shares available for grant	2,600,000
Unrecognized stock compensation expense	$ 36,300
Unrecognized stock compensation expense, recognition period (in years)	1 year 9 months 18 days
Award vesting percentage	50%
Fair value of restricted stock awards	$ 51,700	$ 12,500	$ 13,500
Stock options granted	458,881
Aggregate intrinsic value	$ 2,100
Total intrinsic value of options exercised	1,000	9,000	100
Exercise of stock options	$ 700	$ 7,100	$ 200
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	711,503
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares available for grant	100,000
Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	307,852
Performance-Based | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0%
Performance-Based | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	150%
Stock Options Outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	0
Number of options outstanding (in shares)	88,229	107,612
Non-Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	77,951
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life (in years)	ten
Number of options outstanding (in shares)	10,278

Share-Based Plans - Summary of

Share-Based Plans - Summary of Restricted Stock and Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 31, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Granted (in shares)		458,881
Options, Exercised (in shares)		(30,355)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Award vesting percentage		50%
Reissued treasury stock (in shares)		59,004
Increase in stock compensation expense		$ 18.8
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Granted (in shares)		0
Options, Exercised (in shares)		0
Sterling
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Shares issued (in shares)	87,965,239
Sterling | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Shares issued (in shares)	1,126,495
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock, Outstanding at beginning of period (in shares)		529,284
Restricted Stock, Granted (in shares)		711,503
Restricted stock, Sterling replacement awards (in shares)		1,185,499
Restricted stock, Adjustment (in shares)		187,915
Restricted stock, Vested restricted stock awards (in shares)		(993,512)
Restricted stock, Forfeited (in shares)		(140,947)
Restricted stock, Outstanding at end of period (in shares)		1,479,742
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted stock, at beginning of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 48.77
Restricted stock, Granted (in dollars per share)		54.95
Restricted stock, Sterling replacement awards (in dollars per share)		56.81
Restricted stock, Adjustment (in dollars per share)		56.81
Restricted stock, Vested restricted stock awards (in dollars per share)		48.69
Restricted stock, Forfeited (in dollars per share)		51.43
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 50.47
Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock, Outstanding at beginning of period (in shares)		266,417
Restricted Stock, Granted (in shares)		307,852
Restricted stock, Sterling replacement awards (in shares)		0
Restricted stock, Adjustment (in shares)		(187,915)
Restricted stock, Vested restricted stock awards (in shares)		(59,400)
Restricted stock, Forfeited (in shares)		(16,580)
Restricted stock, Outstanding at end of period (in shares)		310,374
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted stock, at beginning of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 50.03
Restricted stock, Granted (in dollars per share)		57.66
Restricted stock, Sterling replacement awards (in dollars per share)		0
Restricted stock, Adjustment (in dollars per share)		47.43
Restricted stock, Vested restricted stock awards (in dollars per share)		56.14
Restricted stock, Forfeited (in dollars per share)		55.63
Restricted stock, at end of period, Weighted-average Grant Date Fair Value (in dollars per share)		$ 57.65
Performance-Based | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Award vesting percentage		0%
Performance-Based | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Award vesting percentage		150%
Performance-Based | Share Based Payment Arrangement Executives
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted Stock, Granted (in shares)		127,524
Performance-Based | Sterling | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Award vesting percentage		50%
Performance-Based | Sterling | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Award vesting percentage		100%
Stock Options Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, at beginning of period, Number of Shares		107,612
Options, Granted (in shares)		0
Options, Sterling replacement awards (in shares)		10,972
Options, Adjustments (in shares)		0
Options, Vested (in shares)		0
Options, Forfeited (in shares)		0
Options, Exercised (in shares)		(30,355)
Options outstanding, at end of period, Number of Shares		88,229
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Options, at beginning of period, Weighted-average Exercise Price (in dollars per share)		$ 23.05
Options, Granted (in dollars per share)		0
Options, Sterling replacement awards (in dollars per share)		29.14
Options, Adjustment (in dollars per share)		0
Options, Vested (in dollars per share)		0
Options, Forfeited (in dollars per share)		0
Options, Exercised (in dollars per share)		23.18
Options, at end of period, Weighted-average Exercise Price (in dollars per share)		$ 23.76

Share-Based Plans - Summary o_2

Share-Based Plans - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit	$ 12,000	$ 5,400	$ 2,600
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 55,100	$ 13,700	$ 12,200

Share-Based Plans - Options Out

Share-Based Plans - Options Outstanding and Options Exercisable (Details)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	4 months 24 days
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	4 months 24 days

Segment Reporting (Operating Re

Segment Reporting (Operating Results and Total Assets Reportable Segments) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total assets	$ 71,277,521	$ 34,915,599
Net interest income (expense)	2,034,286	901,089	$ 891,393
Noninterest Income	440,783	323,372	285,277
Non-interest expense	1,396,473	745,100	758,946
Pre-tax, pre-provision net revenue	1,078,596	479,361	417,724
Provision (benefit) for credit losses	280,619	(54,500)	137,750
Income (loss) before income tax expense	797,977	533,861	279,974
Income tax expense	153,694	124,997	59,353
Net income	644,283	408,864	220,621
Goodwill	2,514,104	538,373	538,373
Operating Segments [Member] | Commercial Banking [Member]
Segment Reporting Information [Line Items]
Total assets	44,380,582	15,398,159
Net interest income (expense)	1,346,384	585,297	512,691
Noninterest Income	171,437	83,538	66,867
Non-interest expense	398,100	192,977	181,218
Pre-tax, pre-provision net revenue	1,119,721	475,858	398,340
Provision (benefit) for credit losses	276,550	(51,348)	152,571
Income (loss) before income tax expense	843,171	527,206	245,769
Income tax expense	207,188	134,965	61,086
Net income	635,983	392,241	184,683
Goodwill	1,904,291	131,000
Operating Segments [Member] | HSA Bank [Member]
Segment Reporting Information [Line Items]
Total assets	122,729	73,564
Net interest income (expense)	218,149	168,595	162,363
Noninterest Income	104,586	102,814	100,826
Non-interest expense	151,329	134,258	133,919
Pre-tax, pre-provision net revenue	171,406	137,151	129,270
Provision (benefit) for credit losses	0	0	0
Income (loss) before income tax expense	171,406	137,151	129,270
Income tax expense	45,937	36,619	34,501
Net income	125,469	100,532	94,769
Goodwill	57,779	21,813
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Total assets	10,625,334	7,663,921
Net interest income (expense)	720,789	375,318	334,157
Noninterest Income	119,691	95,887	97,778
Non-interest expense	426,133	297,217	334,008
Pre-tax, pre-provision net revenue	414,347	173,988	97,927
Provision (benefit) for credit losses	(3,754)	(3,068)	(14,722)
Income (loss) before income tax expense	418,101	177,056	112,649
Income tax expense	108,657	42,139	24,956
Net income	309,444	134,917	87,693
Goodwill	552,034	385,560
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	16,148,876	11,779,955
Net interest income (expense)	(251,036)	(228,121)	(117,818)
Noninterest Income	45,069	41,133	19,806
Non-interest expense	420,911	120,648	109,801
Pre-tax, pre-provision net revenue	(626,878)	(307,636)	(207,813)
Provision (benefit) for credit losses	7,823	(84)	(99)
Income (loss) before income tax expense	(634,701)	(307,552)	(207,714)
Income tax expense	(208,088)	(88,726)	(61,190)
Net income	(426,613)	(218,826)	$ (146,524)
Goodwill	$ 0	$ 0

Segment Reporting Segment Repor

Segment Reporting Segment Reporting Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Segment	Jan. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	3
Goodwill	$ 2,514,104			$ 538,373	$ 538,373
Deposits	54,054,340			29,847,029
Sterling
Segment Reporting Information [Line Items]
Goodwill		$ 1,939,765
Commercial Banking [Member] | Sterling
Segment Reporting Information [Line Items]
Goodwill		1,700,000
Community Banking [Member]
Segment Reporting Information [Line Items]
Deposits			$ 125,400
Community Banking [Member] | Sterling
Segment Reporting Information [Line Items]
Goodwill		$ 200,000
Community Banking [Member] | Assets Under Administration
Segment Reporting Information [Line Items]
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Asset			4,300,000
HSA Bank [Member] | Bend
Segment Reporting Information [Line Items]
Goodwill			$ 36,000
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 0			$ 0

Revenue from contracts with C_3

Revenue from contracts with Customers Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer, Excluding Assessed Tax	$ 268,672	$ 212,406	$ 198,737
Noninterest Income	440,783	323,372	285,277
Deposit Service Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	198,472	162,710	156,032
Investment Advisory, Management and Administrative Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	40,277	39,586	32,916
Other Non Interest Income [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	8,425	10,110	9,789
Non-Interest Income Within the Scope of Other GAAP Topics [Member]
Noninterest Income	172,111	110,966	86,540
Loans and Lease Related Fees
Revenue from Contract with Customer, Excluding Assessed Tax	21,498
Operating Segments [Member] | Commercial Banking [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	60,511	29,085	25,384
Noninterest Income	171,437	83,538	66,867
Operating Segments [Member] | Commercial Banking [Member] | Deposit Service Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	27,663	16,933	14,740
Operating Segments [Member] | Commercial Banking [Member] | Investment Advisory, Management and Administrative Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	11,350	12,152	10,644
Operating Segments [Member] | Commercial Banking [Member] | Other Non Interest Income [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
Operating Segments [Member] | Commercial Banking [Member] | Non-Interest Income Within the Scope of Other GAAP Topics [Member]
Noninterest Income	110,926	54,453	41,483
Operating Segments [Member] | Commercial Banking [Member] | Loans and Lease Related Fees
Revenue from Contract with Customer, Excluding Assessed Tax	21,498
Operating Segments [Member] | Community Banking [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	101,803	80,172	72,456
Noninterest Income	119,691	95,887	97,778
Operating Segments [Member] | Community Banking [Member] | Deposit Service Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	71,353	50,561	48,493
Operating Segments [Member] | Community Banking [Member] | Investment Advisory, Management and Administrative Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	28,957	27,471	22,307
Operating Segments [Member] | Community Banking [Member] | Other Non Interest Income [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,493	2,140	1,656
Operating Segments [Member] | Community Banking [Member] | Non-Interest Income Within the Scope of Other GAAP Topics [Member]
Noninterest Income	17,888	15,715	25,322
Operating Segments [Member] | Community Banking [Member] | Loans and Lease Related Fees
Revenue from Contract with Customer, Excluding Assessed Tax	0
Operating Segments [Member] | HSA Bank [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	104,586	102,814	100,826
Noninterest Income	104,586	102,814	100,826
Operating Segments [Member] | HSA Bank [Member] | Deposit Service Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	97,654	94,844	92,693
Operating Segments [Member] | HSA Bank [Member] | Investment Advisory, Management and Administrative Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
Operating Segments [Member] | HSA Bank [Member] | Other Non Interest Income [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	6,932	7,970	8,133
Operating Segments [Member] | HSA Bank [Member] | Non-Interest Income Within the Scope of Other GAAP Topics [Member]
Noninterest Income	0	0	0
Operating Segments [Member] | HSA Bank [Member] | Loans and Lease Related Fees
Revenue from Contract with Customer, Excluding Assessed Tax	0
Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,772	335	71
Noninterest Income	45,069	41,133	19,806
Corporate, Non-Segment [Member] | Deposit Service Fees [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,802	372	106
Corporate, Non-Segment [Member] | Investment Advisory, Management and Administrative Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	(30)	(37)	(35)
Corporate, Non-Segment [Member] | Other Non Interest Income [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0
Corporate, Non-Segment [Member] | Non-Interest Income Within the Scope of Other GAAP Topics [Member]
Noninterest Income	43,297	$ 40,798	$ 19,735
Corporate, Non-Segment [Member] | Loans and Lease Related Fees
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0

Commitments and Contingencies_2

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 11,671,663	$ 7,152,331
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	380,655	224,061
Letter of Credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	53,512	58,175
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Unused Commitments to Extend Credit	$ 11,237,496	$ 6,870,095

Commitments and Contingencies_3

Commitments and Contingencies (Schedule for Unfunded Commitments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Unused Commitments to Extend Credit	$ 11,671,663	$ 7,152,331
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		12,755	$ 2,367
Provision			1,249
Ending balance			12,755
Accounting Standards Update 2016-13 [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	0	0	9,139
Ending balance		0	0
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	13,104	12,755
Provision	7,854	349
Ending balance	27,707	13,104	12,755
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired	$ 6,749	$ 0	$ 0

Parent Company Information - Co

Parent Company Information - Components of Condensed Balance Sheets The Parent Company (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Cash and due from banks	$ 264,118	$ 137,385
Intercompany debt securities		150,000
Other assets	1,618,175	531,469
Total assets	71,277,521	34,915,599
Liabilities and stockholders’ equity:
Total liabilities	63,221,335	31,477,274
Total liabilities and stockholders' equity	71,277,521	34,915,599
Parent Company
Assets:
Cash and due from banks	305,331	316,193
Intercompany debt securities	150,000
Investment in subsidiaries	8,631,202	3,526,782
Alternative investments	46,349	20,163
Other assets	13,358	3,953
Total assets	9,146,240	4,017,091
Liabilities and stockholders’ equity:
Senior notes	480,878	485,611
Subordinated notes	514,930	0
Junior subordinated debt	77,320	77,320
Accrued interest payable	7,457	5,861
Due to subsidiaries	3,858	488
Other liabilities	5,611	9,486
Total liabilities	1,090,054	578,766
Stockholders’ equity	8,056,186	3,438,325
Total liabilities and stockholders' equity	$ 9,146,240	$ 4,017,091

Parent Company Information - _2

Parent Company Information - Components of Condensed Income Statement The Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income:
Total income	$ 1,078,596	$ 479,361	$ 417,724
Expense:
Other non-interest expense	180,088	77,341	78,228
Income (loss) before income taxes and equity in undistributed earnings of subsidiaries	797,977	533,861	279,974
Income tax benefit	(153,694)	(124,997)	(59,353)
Net income	644,283	408,864	220,621
Parent Company
Income:
Dividend income from bank subsidiary	475,000	200,000	20,000
Interest income on securities and interest-bearing deposits	5,955	3,444	5,530
Alternative investments income	6,416	13,033	2,467
Other non-interest income	112	75	634
Total income	487,483	216,552	28,631
Expense:
Interest expense on borrowings	34,284	16,876	18,684
Merger-related expenses	40,314	16,266	0
Other non-interest expense	22,592	15,921	16,426
Total expense	97,190	49,063	35,110
Income (loss) before income taxes and equity in undistributed earnings of subsidiaries	390,293	167,489	(6,479)
Income tax benefit	20,799	3,121	4,572
Equity in undistributed earnings of subsidiaries	233,191	238,254	222,528
Net income	$ 644,283	$ 408,864	$ 220,621

Parent Company Information - _3

Parent Company Information - Components of Condensed Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other comprehensive (loss) income, net of tax:
Derivative instruments	$ (14,944)	$ (13,848)	$ 29,102
Other comprehensive (loss) income, net of tax	(662,380)	(64,836)	78,328
Parent Company
Condensed Statement of Income Captions [Line Items]
Net income	644,283	408,864	220,621
Other comprehensive (loss) income, net of tax:
Derivative instruments	226	226	2,622
Other comprehensive (loss) income of subsidiaries	(662,606)	(65,062)	75,706
Other comprehensive (loss) income, net of tax	(662,380)	(64,836)	78,328
Comprehensive (loss) income	$ (18,097)	$ 344,028	$ 298,949

Parent Company Information - _4

Parent Company Information - Components of Condensed Cash Flow The Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 644,283	$ 408,864	$ 220,621
Adjustments to reconcile net income to net cash provided by operating activities:
Common stock contribution to charitable foundation	10,500	0	0
Net cash provided by operating activities	1,335,952	688,592	380,549
Investing activities:
Alternative investments (capital call), net of distributions	(24,887)	(11,361)	(12,244)
Net cash provided by (used in) investing activities	(7,186,338)	(2,405,089)	(2,288,609)
Financing activities:
Dividends paid to common stockholders	(247,767)	(144,807)	(144,965)
Dividends paid to preferred stockholders	(13,725)	(7,875)	(7,875)
Exercise of stock options	703	3,492	240
Common stock repurchase program	(322,103)	0	(76,556)
Common shares acquired related to stock compensation plan activity	23,655	4,384	3,506
Net cash (used in) by financing activities	6,228,759	1,914,963	1,913,269
Net (decrease) increase in cash and cash equivalents	378,373	198,466	5,209
Cash and cash equivalents at beginning of year	461,570	263,104	257,895
Cash and cash equivalents at end of year	839,943	461,570	263,104
Parent Company
Operating activities:
Net income	644,283	408,864	220,621
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(233,191)	(238,254)	(222,528)
Common stock contribution to charitable foundation	10,500	0	0
Other, net	(2,853)	3,562	29,697
Net cash provided by operating activities	418,739	174,172	27,790
Investing activities:
Alternative investments (capital call), net of distributions	(16,292)	(6,304)	(3,751)
Net cash received in business combination	193,238	0	0
Net cash provided by (used in) investing activities	176,946	(6,304)	(3,751)
Financing activities:
Dividends paid to common stockholders	247,767	145,223	144,967
Dividends paid to preferred stockholders	13,725	7,875	7,875
Exercise of stock options	703	3,492	240
Common stock repurchase program	322,103	0	76,556
Common shares acquired related to stock compensation plan activity	(23,655)	(4,384)	(3,506)
Net cash (used in) by financing activities	(606,547)	(153,990)	(232,664)
Net (decrease) increase in cash and cash equivalents	(10,862)	13,878	(208,625)
Cash and cash equivalents at beginning of year	316,193	302,315	510,940
Cash and cash equivalents at end of year	$ 305,331	$ 316,193	$ 302,315