Webster Financial (WBS) 10-Q 10 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 03, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		171,486,534
Entity Central Index Key	0000801337
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024
Common Class A
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	WBS
Security Exchange Name	NYSE
Series F Preferred Stock
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
Series G Preferred Stock
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

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets:
Cash and due from banks	$ 322,041	$ 429,323
Interest-bearing deposits	1,223,187	1,286,472
Investment securities available-for-sale, at fair value	8,601,141	8,959,729
Investment securities held-to-maturity, net of allowance for credit losses of $184 and $209	7,679,891	7,074,588
Federal Home Loan Bank and Federal Reserve Bank stock	381,451	326,882
Loans held for sale ($323 and $2,610 valued under fair value option)	239,763	6,541
Loans and leases	51,098,642	50,726,052
Allowance for credit losses on loans and leases	(641,442)	(635,737)
Loans and leases, net	50,457,200	50,090,315
Deferred tax assets, net	341,292	369,212
Premises and equipment, net	423,128	429,561
Goodwill	2,868,068	2,631,465
Other intangible assets, net	382,841	203,135
Cash surrender value of life insurance policies	1,237,828	1,247,938
Accrued interest receivable and other assets	2,003,862	1,890,088
Total assets	76,161,693	74,945,249
Liabilities and stockholders’ equity:
Non-interest-bearing	10,212,509	10,732,516
Interest-bearing	50,535,234	50,051,768
Total deposits	60,747,743	60,784,284
Securities sold under agreements to repurchase and other borrowings	361,886	458,387
Federal Home Loan Bank advances	3,659,930	2,360,018
Long-term debt	914,520	1,048,820
Accrued expenses and other liabilities	1,730,116	1,603,744
Total liabilities	67,414,195	66,255,253
Stockholders’ equity:
Common stock	1,828	1,828
Paid-in capital	6,138,935	6,179,753
Retained earnings	3,425,701	3,282,530
Treasury stock, at cost—10,314,159 and 10,756,089 shares	(486,844)	(507,523)
Accumulated other comprehensive (loss), net of tax	(616,101)	(550,571)
Total stockholders’ equity	8,747,498	8,689,996
Total liabilities and stockholders’ equity	76,161,693	74,945,249
Series F Preferred Stock
Stockholders’ equity:
Preferred stock	145,037	145,037
Series G Preferred Stock
Stockholders’ equity:
Preferred stock	$ 138,942	$ 138,942

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Allowance	$ 184	$ 209
Value under fair value options	323	2,610
Loans held for sale, valued under fair value option	$ 323	$ 2,610
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	182,778,045
Treasury stock (in shares)	10,314,159	10,756,089
Series F Preferred Stock
Preferred stock, shares issued (in shares)	6,000	6,000
Preferred stock, shares outstanding (in shares)	6,000	6,000
Series G Preferred Stock
Preferred stock, shares issued (in shares)	135,000
Preferred stock, shares outstanding (in shares)	135,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest Income:
Interest and fees on loans and leases	$ 792,045	$ 716,356
Taxable interest on investment securities	135,071	85,566
Non-taxable interest on investment securities	12,514	13,684
Loans held for sale	82	16
Total interest income	951,850	830,928
Interest Expense:
Deposits	335,971	150,204
Securities sold under agreements to repurchase and other borrowings	2,108	7,827
Federal Home Loan Bank advances	37,367	68,126
Long-term debt	8,665	9,488
Total interest expense	384,111	235,645
Net interest income	567,739	595,283
Provision (benefit) for credit losses	45,500	46,749
Net interest income after provision for credit losses	522,239	548,534
Non-interest Income:
Deposit service fees	42,589	45,436
Loan and lease related fees	19,767	23,005
Wealth and investment services	7,924	6,587
Cash surrender value of life insurance policies	5,946	6,728
(Loss) on sale of investment securities, net	(9,826)	(16,747)
Other income	32,953	5,757
Total non-interest income	99,353	70,766
Non-interest Expense:
Compensation and benefits	188,540	173,200
Occupancy	19,439	20,171
Technology and equipment	45,836	44,366
Intangible assets amortization	9,194	9,497
Marketing	4,281	3,476
Professional and outside services	12,981	32,434
Deposit insurance	24,223	12,323
Other expense	31,429	37,000
Total non-interest expense	335,923	332,467
Income before income taxes	285,669	286,833
Income tax expense	69,346	65,829
Net income	216,323	221,004
Less: Preferred stock dividends	4,163	4,163
Net income available to common stockholders	212,160	216,841
Earnings applicable to common stockholders	$ 212,160	$ 216,841
Earnings per common share:
Basic (in dollars per share)	$ 1.23	$ 1.24
Diluted (in dollars per share)	$ 1.23	$ 1.24
Other Interest and Dividend Income	$ 12,138	$ 15,306

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 216,323	$ 221,004
Other comprehensive (loss) income, net of tax:
Investment securities available-for-sale	(36,271)	71,618
Derivative instruments	(29,989)	21,374
Defined benefit pension and other postretirement benefit plans	730	3,948
Other comprehensive (loss) income, net of tax	(65,530)	96,940
Comprehensive income	$ 150,793	$ 317,944

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Series F Preferred Stock	Series G Preferred Stock	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings [Member] Series F Preferred Stock	Retained Earnings [Member] Series G Preferred Stock	Treasury Stock, Common	Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance at Dec. 31, 2022	$ 8,056,186	$ (4,245)			$ 283,979	$ 1,828	$ 6,173,240	$ 2,713,861	$ (4,245)			$ (431,762)	$ (684,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	221,004							221,004
Other comprehensive (loss), net of tax	96,940												96,940
Common stock dividends and equivalents	(69,712)							(69,712)
Preferred stock dividends			$ (1,969)	$ (2,194)						$ (1,969)	$ (2,194)
Stock-based compensation	11,646						(33,471)					45,117
Exercise of stock options	1,723						(2,026)					3,749
Common shares acquired from stock compensation plan activity	(15,085)											(15,085)
Ending Balance at Mar. 31, 2023	8,294,294				283,979	1,828	6,137,743	2,856,745				(397,981)	(588,020)
Beginning Balance at Dec. 31, 2023	8,689,996				283,979	1,828	6,179,753	3,282,530				(507,523)	(550,571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	216,323							216,323
Other comprehensive (loss), net of tax	(65,530)												(65,530)
Common stock dividends and equivalents	(68,989)							(68,989)
Preferred stock dividends			$ (1,969)	$ (2,194)						$ (1,969)	$ (2,194)
Stock-based compensation	13,760						(40,818)					54,578
Common shares acquired from stock compensation plan activity	(13,496)											(13,496)
Common stock repurchase program	(20,403)											(20,403)
Ending Balance at Mar. 31, 2024	$ 8,747,498				$ 283,979	$ 1,828	$ 6,138,935	$ 3,425,701				$ (486,844)	$ (616,101)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Common stock dividends/equivalents (in dollars per share)	$ 0.40	$ 0.40
Series F Preferred Stock
Preferred stock dividends (in dollars per share)	328.125	328.125
Series G Preferred Stock
Preferred stock dividends (in dollars per share)	$ 16.25	$ 16.25

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net income	$ 216,323	$ 221,004
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	45,500	46,749
Deferred Income Tax Expense (Benefit)	16,470	13,911
Stock-based compensation	13,760	11,646
Depreciation and amortization of property and equipment and intangible assets	19,027	20,745
Net (accretion) and amortization of interest-earning assets and borrowings	(11,893)	(4,388)
Amortization of low-income housing tax credit investments	20,413	21,478
Reduction of right-of-use lease assets	7,475	7,525
Loss on sale of investment securities, net	9,826	16,747
Originations of loans held for sale	(3,317)	(2,590)
Proceeds from sale of loans held for sale	4,713	3,832
Net (gain) on sale of mortgage servicing rights	(11,655)	0
(Increase) in cash surrender value of life insurance policies	(5,946)	(6,728)
Other operating activities, net	11,145	677
Increase (Decrease) in Derivative Assets and Liabilities	56,534	(48,570)
Increase (Decrease) in Other Operating Assets	296,416	(8,150)
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities	(418,820)	(78,240)
Net cash provided by operating activities	243,681	214,294
Investing Activities:
Purchases of available-for-sale securities	(244,434)	(357,784)
Proceeds from principal payments, maturities, and calls of available-for-sale securities	205,507	119,033
Proceeds from sale of available-for-sale securities	331,690	395,358
Purchases of held-to-maturity securities	(677,961)	(599,387)
Proceeds from principal payments, maturities, and calls of held-to-maturity securities	80,360	99,992
Net (increase) in Federal Home Loan Bank and Federal Reserve Bank stock	(54,569)	(138,824)
Alternative investments (capital calls), net of distributions	(4,192)	(3,184)
Net (increase) in loans	(692,991)	(1,478,986)
Proceeds from sale of loans not originated for sale	49,440	106,779
Proceeds from sale of mortgage servicing rights	18,310	0
Proceeds from sale of foreclosed properties and repossessed assets	790	1,745
Proceeds from sale of property and equipment	1,042	0
Additions to property and equipment	(5,057)	(10,293)
Proceeds from life insurance policies	3,977	0
Net cash (used for) investing activities	(1,347,548)	(2,023,197)
Financing Activities:
Net (decrease) increase in deposits	(26,850)	1,236,463
Net increase in Federal Home Loan Bank advances	1,299,912	3,099,909
Net (decrease) in securities sold under agreements to repurchase and other borrowings	(96,501)	(845,676)
Repayment of long-term debt	(132,550)	0
Payment of contingent consideration	(4,050)	0
Dividends paid to common stockholders	(68,599)	(70,140)
Dividends paid to preferred stockholders	(4,163)	(4,163)
Exercise of stock options	0	1,723
Common stock repurchase program	(20,403)	0
Common shares acquired related to stock compensation plan activity	(13,496)	(15,085)
Net cash provided by financing activities	933,300	3,403,031
Net (decrease) increase in cash and cash equivalents	(170,567)	1,594,128
Cash and cash equivalents, beginning of period	1,715,795	839,943
Cash and cash equivalents, end of period	1,545,228	2,434,071
Supplemental disclosure of cash flow information:
Interest paid	416,290	221,182
Income taxes paid	11,240	6,334
Non-cash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets	742	607
Transfer of returned lease equipment to assets held for sale	1,524	0
Transfer of loans and leases to loans held for sale	284,806	316,596
Forgiveness of long-term debt	(12,875)	0
Pre-existing equity interest	(2,200)	0
Sterling
Non-cash investing and financing activities:
Tangible assets acquired	0	17,607
Goodwill and other intangible assets	0	(25,561)
Liabilities assumed	0	7,954
Bend Financial, Inc.
Non-cash investing and financing activities:
Tangible assets acquired	0	294
Goodwill and other intangible assets	0	(294)
interLINK
Investing Activities:
Net cash paid for acquisition of Bend	0	(157,646)
Non-cash investing and financing activities:
Tangible assets acquired	0	6,417
Goodwill and other intangible assets	0	183,216
Liabilities assumed	0	(15,948)
Contingent consideration	0	16,039
Ametros
Investing Activities:
Net cash paid for acquisition of Bend	(359,460)	0
Non-cash investing and financing activities:
Tangible assets acquired	256,957	0
Goodwill and other intangible assets	417,085	0
Liabilities assumed	$ (299,507)	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Basis of Presentation and Accounting Standards Updates Basis of Presentation The unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X. Certain information and footnote disclosures required by GAAP for complete financial statements have been omitted or condensed. Therefore, the Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations for the three months ended March 31, 2024, are not necessarily indicative of the future results that may be attained for the entire year or other interim periods. In the opinion of management, all necessary adjustments have been reflected to present fairly the financial position, results of operations, and cash flows for the reporting periods presented. 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 in the Condensed Consolidated Financial Statements. Certain prior period amounts have been reclassified to conform to the current period presentation. These reclassifications did not have a material impact on the Company’s Condensed Consolidated Financial Statements. Use of Estimates The preparation of the Condensed 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 Condensed Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Accounting Standards Adopted in the Current Period ASU No. 2023-02—Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method (a consensus of the Emerging Issue Task Force) In March 2023, the FASB issued ASU No. 2023-02—Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method (a consensus of the Emerging Issues Task Force), which permits reporting entities to elect to account for their tax equity investments, regardless of the program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. A reporting entity may make an accounting policy election to apply the proportional amortization method in accordance with paragraph 323-740-25-4 on a tax-credit-program by tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. A reporting entity that applies the proportional amortization method to qualifying tax equity investments must account for the receipt of the investment tax credits using the flow-through method under Topic 740, Income Taxes, even if the entity applies the deferral method for other investment tax credits received. The amendments also remove certain guidance for Qualified Affordable Housing Project Investments, require the application of the delayed equity contribution guidance to all tax equity investments, and require specific disclosures that must be applied to all investments that generate income tax credits and other income tax benefits from a tax credit program for which the entity has elected to apply the proportional amortization method in accordance with Subtopic 323-740. The Company adopted the Update on January 1, 2024. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements and disclosures as its investments in tax credit structures are currently limited to LIHTC investments, which are already being accounted for using the proportional amortization method. ASU No. 2023-01—Leases (Topic 842): Common Control Arrangements In March 2023, the FASB issued ASU No. 2023-01—Leases (Topic 842): Common Control Arrangements, which requires that leasehold improvements associated with leases between entities under common control be: (i) amortized by the lessee over the useful lives of the leasehold improvements to the common control group (regardless of the lease term) as long as the lessee controls the use of the underlying asset (the leased asset) through a lease; however, if the lessor obtained the right to control the use of the underlying asset through a lease with another entity not within the same common control group, the amortization period may not exceed the amortization period of the common control group; and (ii) accounted for as a transfer between entities under common control through an adjustment to equity, if, and when, the lessee no longer controls the use of the underlying asset. Additionally, those leasehold improvements are subject to the impairment guidance in Topic 360, Property, Plant, and Equipment. The Company adopted the Update on January 1, 2024. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements and disclosures as its operating lease arrangements in which it is lessee are currently not between entities under common control. ASU No. 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restriction 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 requires 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). The Company adopted the Update on January 1, 2024. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements and disclosures. The Company does not currently consider contractual restrictions on the sale of an equity security in measuring fair value. Relevant Accounting Standards Issued But Not Yet Adopted ASU No. 2023-09—Income Taxes (Topic 740)—Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09—Income Taxes (Topic 740)—Improvements to Income Tax Disclosures, to provide more transparency about income tax information through improvements to income tax disclosures, primarily related to the rate reconciliation and income taxes paid information. Specifically, the amendments in this Update require disclosure of: (i) a tabular reconciliation, using both percentages and reporting currency amounts, with prescribed categories that are required to be disclosed, and the separate disclosure and disaggregation of prescribed reconciling items with an effect equal to 5% or more of the amount determined by multiplying pretax income from continuing operations by the application statutory rate; (ii) a qualitative description of the states and local jurisdictions that make up the majority (greater than 50%) of the effect of the state and local income taxes; and (iii) amount of income taxes paid, net of refunds received, disaggregated by federal, state, and foreign taxes and by individual jurisdictions that comprise 5% or more of total income taxes paid, net of refunds received. The amendments in this Update also include certain other amendments to improve the effectiveness of income tax disclosures. The Update is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The amendments should be applied on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating this guidance to determine the impact on its income tax disclosures. ASU No. 2023-07—Segment Reporting (Topic 280)—Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU No. 2023-07—Segment Reporting (Topic 280)—Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. Specifically, the amendments in this Update require disclosure of: (i) significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss; (ii) an amount for other segment items by reportable segment and a description of its composition; and (iii) the title and position of the chief operating decision maker and an explanation of how the chief operating decision maker uses each reported measure of segment profit or loss in assessing segment performance and deciding how to allocate resources. In addition, all annual disclosures about a reportable segment’s profit or loss and assets currently required by Topic 280, will be required in interim periods. Overall, the Update does not change how a public entity identifies its operating segments, aggregates those operating segments, or determines its reportable segments, or applies the quantitative thresholds to determine its reportable segments. The Update is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements, in which, upon transition, the segment expense categories and amounts disclosed in the prior periods should be based on the significant segment expense categories identified and disclosed in the period of adoption. The Company is currently evaluating this guidance to determine the impact on its segment reporting disclosures.

Mergers and Acquisitions

Mergers and Acquisitions	3 Months Ended
	Mar. 31, 2024
Business Combination and Asset Acquisition [Abstract]
Mergers and Acquisitions	Business Developments Ametros Acquisition On January 24, 2024, the Bank acquired all of the equity interest in Ametros from Long Ridge Capital Management The acquisition was accounted for as a business combination. Accordingly, the total purchase price, which included cash paid of $359.7 million, the forgiveness of $12.9 million in long-term debt, and the assumption of a $5.8 million liability for the Seller’s transaction expenses, has been preliminarily allocated to the identifiable assets acquired and liabilities assumed based on their acquisition-date fair values, as summarized in the following table: (In thousands) Fair Value Purchase price consideration $ 378,424 Assets: Cash and due from banks 310 Premises and equipment 1,078 Other intangible assets 188,900 Deferred tax assets, net (35,889) Other assets: Funds held in escrow 288,167 Accounts receivable 2,435 Prepaid expenses 1,166 Total other assets 291,768 Total assets acquired $ 446,167 Liabilities: Interest-bearing deposits (1) (20,622) Other liabilities: Accounts payable 684 Accrued expenses 4,270 Deferred revenue 20,391 Member’s funds 288,167 Operating lease liabilities 838 Total other liabilities 314,350 Total liabilities assumed $ 293,728 Net assets acquired 152,439 Pre-existing equity interest (2) $ 2,200 Goodwill $ 228,185 (1) The $20.6 million reflects the amount held in Ametros’ operating cash account at the Bank on January 24, 2024. Upon acquisition, such cash and the Bank’s corresponding deposit liability owed to Ametros were eliminated in consolidation, which resulted in a decrease to interest-bearing deposits for the Bank and the Bank’s legal title to the funds being held in such operating cash account. (2) Prior to the acquisition date, the Company had a 0.6% equity interest in Ametros. The consideration transferred reflects the purchase price for the remaining 99.4% of the business. Upon acquisition, the Company recognized a $1.5 million gain in Other income on the accompanying Condensed Consolidated Statement of Income, which represents the difference between the cost basis and estimated acquisition-date fair value of the Company’s pre-existing equity interest in Ametros. The $228.2 million of preliminary goodwill is not deductible for tax purposes. Information regarding the allocation of goodwill to the Company’s reportable segments can be found within Note 15: Segment Reporting. The Company considers its valuations of other intangible assets, deferred taxes, and certain other assets and other liabilities to be provisional, as management continues to identify and assess information regarding the nature of these assets acquired and liabilities assumed, including extended information gathering and management review procedures. Although the Company believes that the information available as of March 31, 2024, provides a reasonable basis for estimating fair value, it is possible that additional information becomes available during the one-year measurement period following the close of the acquisition, which could result in changes to the fair values presented. The results of operations related to the acquired Ametros business are included in the Company’s Condensed Consolidated Statements of Income subsequent to the acquisition date, and were not material for the three months ended March 31, 2024. The following is a description of the valuation methodologies used to estimate the fair values of the significant assets acquired and liabilities assumed: Other intangible assets. The Company identified and recognized a $182.8 million core deposit intangible asset and a Funds held in escrow and Members’ funds. Funds held in escrow represent amounts held in interest-bearing checking accounts at insured depository institutions other than the Bank for the purpose of providing post-settlement medical administration services on a respective member’s behalf. Members’ funds is the corresponding liability to the Funds held in escrow. Given that these amounts can be withdrawn and/or directed for use on demand, as long as in accordance with the terms of the settlement agreement, their carrying amount is a reasonable estimate of fair value. Held-for-Sale Payroll Finance and Factored Receivables Loan Portfolio In March 2024, the Company initiated a plan to actively sell its payroll finance and factored receivables loan portfolio, along with the related customer relationship intangible assets. The decision to sell was a direct result of the Company’s continuous reassessment of its strategic model in an effort to identify opportunities to improve its core financial products and services. The Company expects to complete the sale in either the second or third quarter of 2024. At March 31, 2024, the portfolio held-for-sale comprised $220.2 million in aggregate of payroll finance and factored receivables loans, which are included in Loans held for sale on the Condensed Consolidated Balance Sheets. The aggregate net carrying amount of the related customer relationship intangible assets was $49.7 million. These assets are included in Commercial Banking for segment reporting purposes. Sale of Mortgage Servicing Rights On February 12, 2024, the Company sold the majority of its mortgage servicing portfolio, which comprised 9,184 individual mortgage loans with an aggregate UPB of $1.4 billion. In connection with the sale, the Company received net cash proceeds of $18.4 million and derecognized $6.7 million of mortgage servicing rights from Accrued interest receivable and other assets on the Condensed Consolidated Balance Sheet. The resulting $11.7 million net gain on sale of mortgage servicing rights is included in Other income on the Condensed Consolidated Statements of Operations. interLINK Acquisition On January 11, 2023, the Company acquired 100% ownership of interLINK from StoneCastle Partners LLC. interLINK is 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. The acquisition provided the Company with access to a unique source of core deposit funding and scalable liquidity and added another technology-enabled channel to its already differentiated, omnichannel deposit gathering capabilities. The total purchase price of the acquisition was $174.6 million, which included cash paid of $158.6 million and $16.0 million of contingent consideration measured at fair value. The contingent consideration is payable in cash upon the achievement of discrete customer and deposit growth events within three years of the acquisition date. Additional information regarding contingent consideration, including the determination of fair value, can be found within Note 13: Fair Value Measurements. The acquisition has been accounted for as a business combination, and resulted in the addition of $31.4 million in net assets measured at fair value, which primarily comprised $36.0 million of broker dealer relationship intangible assets, $6.0 million of developed technology, a $4.0 million non-competition agreement intangible asset, and $15.9 million of royalty liabilities. The $143.2 million of goodwill recognized is deductible for tax purposes.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Available-for-Sale The following tables summarize the amortized cost and fair value of available-for-sale securities by major type: At March 31, 2024 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Government agency debentures $ 302,261 $ — $ (39,773) $ 262,488 Municipal bonds and notes 1,257,643 23 (50,316) 1,207,350 Agency CMO 50,422 — (4,186) 46,236 Agency MBS 3,629,162 19,414 (284,162) 3,364,414 Agency CMBS 2,619,079 12,555 (310,404) 2,321,230 CMBS 752,086 32 (20,267) 731,851 Corporate debt 693,093 142 (76,026) 617,209 Private label MBS 46,044 — (4,736) 41,308 Other 9,836 — (781) 9,055 Total available-for-sale $ 9,359,626 $ 32,166 $ (790,651) $ 8,601,141 At December 31, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Government agency debentures $ 302,212 $ — $ (37,579) $ 264,633 Municipal bonds and notes 1,626,126 8 (52,901) 1,573,233 Agency CMO 52,994 — (4,053) 48,941 Agency MBS 3,568,140 32,461 (253,503) 3,347,098 Agency CMBS 2,569,438 18,204 (299,571) 2,288,071 CMBS 788,478 — (24,729) 763,749 Corporate debt 704,569 — (82,414) 622,155 Private label MBS 46,635 — (3,827) 42,808 Other 9,830 — (789) 9,041 Total available-for-sale $ 9,668,422 $ 50,673 $ (759,366) $ 8,959,729 (1) Accrued interest receivable on available-for-sale securities of $43.6 million and $42.5 million at March 31, 2024, and December 31, 2023, respectively, is excluded from amortized cost and is included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. Unrealized Losses The following tables summarize the gross unrealized losses and fair value of available-for-sale securities by length of time each major security type has been in a continuous unrealized loss position: At March 31, 2024 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized Government agency debentures $ — $ — $ 262,488 $ (39,773) 19 $ 262,488 $ (39,773) Municipal bonds and notes 16,078 (179) 1,180,389 (50,137) 346 1,196,467 (50,316) Agency CMO — — 46,236 (4,186) 36 46,236 (4,186) Agency MBS 187,534 (892) 1,930,864 (283,270) 462 2,118,398 (284,162) Agency CMBS 424,108 (16,031) 1,356,358 (294,373) 148 1,780,466 (310,404) CMBS 34,913 (87) 674,009 (20,180) 40 708,922 (20,267) Corporate debt — — 612,760 (76,026) 89 612,760 (76,026) Private label MBS — — 41,308 (4,736) 3 41,308 (4,736) Other — — 9,055 (781) 2 9,055 (781) Total $ 662,633 $ (17,189) $ 6,113,467 $ (773,462) 1,145 $ 6,776,100 $ (790,651) At December 31, 2023 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized Government agency debentures $ — $ — $ 264,633 $ (37,579) 19 $ 264,633 $ (37,579) Municipal bonds and notes 18,066 (124) 1,536,656 (52,777) 386 1,554,722 (52,901) Agency CMO — — 48,941 (4,053) 36 48,941 (4,053) Agency MBS 71,187 (272) 1,945,221 (253,231) 457 2,016,408 (253,503) Agency CMBS 430,070 (16,137) 1,314,681 (283,434) 145 1,744,751 (299,571) CMBS 43,844 (856) 719,905 (23,873) 42 763,749 (24,729) Corporate debt 4,278 (27) 617,877 (82,387) 91 622,155 (82,414) Private label MBS — — 42,808 (3,827) 3 42,808 (3,827) Other — — 9,041 (789) 2 9,041 (789) Total $ 567,445 $ (17,416) $ 6,499,763 $ (741,950) 1,181 $ 7,067,208 $ (759,366) The $31.3 million increase in gross unrealized losses from December 31, 2023, to March 31, 2024, is primarily due to higher interest rates. The Company assesses each available-for-sale security that is in an unrealized loss position to determine whether the decline in fair value below the amortized cost basis is a result of a credit loss or other factors. At both March 31, 2024, and December 31, 2023, no ACL was recorded on available-for-sale securities as each of the securities in the Company’s portfolio are investment grade, current as to principal and interest, and their price changes are consistent with interest and credit spreads when adjusting for convexity, rating, and industry differences. As of March 31, 2024, based on current market conditions and the Company’s targeted balance sheet composition strategy, the Company intends to hold its available-for-sale securities with unrealized loss positions through the anticipated recovery period. The issuers of these available-for-sale securities have not, to the Company’s knowledge, established any cause for default. Market prices are expected to approach par as the securities approach maturity. Contractual Maturities The following table summarizes the amortized cost and fair value of available-for-sale securities by contractual maturity: At March 31, 2024 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 32,356 $ 31,621 After 1 year through 5 years 597,123 565,463 After 5 through 10 years 1,271,850 1,173,728 After 10 years 7,458,297 6,830,329 Total available-for-sale $ 9,359,626 $ 8,601,141 Available-for-sale 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 related to sales of available-for-sales securities: Three months ended March 31, (In thousands) 2024 2023 Proceeds from sales $ 331,690 $ 395,358 Gross realized gains $ 2,240 $ — Gross realized losses (14,636) (20,483) For the three months ended March 31, 2024, and 2023, net realized losses on sale of available-for-sale securities were $12.4 million and $20.5 million, respectively. Because $2.6 million and $3.8 million of the gross realized losses for the three months ended March 31, 2024 and 2023, respectively, were attributed to a decline in credit quality, those portions have been included in the Provision for credit losses on the accompanying Condensed Consolidated Statements of Income. The amounts of $9.8 million and $16.7 million for the three months ended March 31, 2024, and 2023, respectively, that are included in Other Information The following table summarizes the carrying value of available-for-sale securities pledged for deposits, borrowings, and other purposes: (In thousands) At March 31, 2024 At December 31, 2023 Pledged for deposits $ 2,418,726 $ 2,102,115 Pledged for borrowings and other 5,687,136 6,111,430 Total available-for-sale securities pledged $ 8,105,862 $ 8,213,545 At March 31, 2024, the Company had callable available-for-sale securities with an aggregate carrying value of $2.6 billion. Held-to-Maturity The following tables summarize the amortized cost, fair value, and ACL on held-to-maturity securities by major type: At March 31, 2024 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 22,489 $ — $ (1,938) $ 20,551 $ — $ 22,489 Agency MBS 2,618,783 1,429 (327,351) 2,292,861 — 2,618,783 Agency CMBS 4,028,799 11,580 (540,641) 3,499,738 — 4,028,799 Municipal bonds and notes 910,422 683 (34,953) 876,152 184 910,238 CMBS 99,582 — (6,017) 93,565 — 99,582 Total held-to-maturity $ 7,680,075 $ 13,692 $ (910,900) $ 6,782,867 $ 184 $ 7,679,891 At December 31, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 23,470 $ — $ (1,728) $ 21,742 $ — $ 23,470 Agency MBS 2,409,521 1,141 (284,776) 2,125,886 — 2,409,521 Agency CMBS 3,625,627 18,586 (514,534) 3,129,679 — 3,625,627 Municipal bonds and notes 916,104 2,440 (24,877) 893,667 209 915,895 CMBS 100,075 — (6,426) 93,649 — 100,075 Total held-to-maturity $ 7,074,797 $ 22,167 $ (832,341) $ 6,264,623 $ 209 $ 7,074,588 (1) Accrued interest receivable on held-to-maturity securities of $22.6 million and $24.9 million at March 31, 2024, and December 31, 2023, respectively, is excluded from amortized cost and is included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. An ACL on held-to-maturity 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. Held-to-maturity securities with gross unrealized losses and no ACL are considered to be high credit quality, and therefore, zero credit loss has been recorded. The following table summarizes the activity in the ACL on held-to-maturity securities: Three months ended March 31, (In thousands) 2024 2023 Balance, beginning of period $ 209 $ 182 (Benefit) provision for credit losses (25) 100 Balance, end of period $ 184 $ 282 Contractual Maturities The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity: At March 31, 2024 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 29,846 $ 29,771 After 1 year through 5 years 94,598 89,326 After 5 through 10 years 299,712 288,067 After 10 years 7,255,919 6,375,703 Total held-to-maturity $ 7,680,075 $ 6,782,867 Held-to-maturity 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 held-to-maturity securities through credit ratings provided by Standard & Poor’s Rating Services, Moody’s Investor Services, 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 held-to-maturity securities at either March 31, 2024, or December 31, 2023. Held-to-maturity securities that are not rated are collateralized with U.S. Treasury obligations. The following tables summarize the amortized cost of held-to-maturity securities based on their lowest publicly available credit rating: March 31, 2024 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A3 Not Rated Agency CMO $ — $ 22,489 $ — $ — $ — $ — $ — Agency MBS — 2,618,783 — — — — — Agency CMBS — 4,028,799 — — — — — Municipal bonds and notes 332,969 162,439 252,852 111,277 32,690 4,165 14,030 CMBS 99,582 — — — — — — Total held-to-maturity $ 432,551 $ 6,832,510 $ 252,852 $ 111,277 $ 32,690 $ 4,165 $ 14,030 December 31, 2023 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A3 Not Rated Agency CMO $ — $ 23,470 $ — $ — $ — $ — $ — Agency MBS — 2,409,521 — — — — — Agency CMBS — 3,625,627 — — — — — Municipal bonds and notes 333,479 162,615 253,671 115,404 32,732 4,165 14,038 CMBS 100,075 — — — — — — Total held-to-maturity $ 433,554 $ 6,221,233 $ 253,671 $ 115,404 $ 32,732 $ 4,165 $ 14,038 At both March 31, 2024, and December 31, 2023, there were no held-to-maturity securities past due under the terms of their agreements nor in non-accrual status. Other Information The following table summarizes the carrying value of held-to-maturity securities pledged for deposits, borrowings, and other purposes: (In thousands) At March 31, 2024 At December 31, 2023 Pledged for deposits $ 1,557,987 $ 1,212,824 Pledged for borrowings and other 5,732,569 5,582,379 Total held-to-maturity securities pledged $ 7,290,556 $ 6,795,203 At March 31, 2024, the Company had callable held-to-maturity securities with an aggregate carrying value of $0.9 billion.

Loans and Leases

Loans and Leases	3 Months Ended
	Mar. 31, 2024
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	Loans and Leases The following table summarizes loans and leases by portfolio segment and class: (In thousands) At March 31, At December 31, 2023 Commercial non-mortgage $ 16,696,070 $ 16,885,475 Asset-based 1,492,886 1,557,841 Commercial real estate 13,972,916 13,569,762 Multi-family 7,896,586 7,587,970 Equipment financing 1,280,058 1,328,786 Commercial portfolio 41,338,516 40,929,834 Residential 8,226,154 8,227,923 Home equity 1,479,420 1,516,955 Other consumer 54,552 51,340 Consumer portfolio 9,760,126 9,796,218 Loans and leases $ 51,098,642 $ 50,726,052 The carrying amount of loans and leases at March 31, 2024, and December 31, 2023, includes net unamortized At March 31, 2024, the Company had pledged $17.8 billion and $1.2 billion of eligible loans as collateral to support borrowing capacity at the FHLB and FRB, respectively. 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 March 31, 2024 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Current Total Loans Commercial non-mortgage $ 3,077 $ 3,138 $ 35 $ 193,294 $ 199,544 $ 16,496,526 $ 16,696,070 Asset-based — — — 34,893 34,893 1,457,993 1,492,886 Commercial real estate 28,137 717 12,452 3,815 45,121 13,927,795 13,972,916 Multi-family 21,750 22,406 — 10,439 54,595 7,841,991 7,896,586 Equipment financing 6,189 2,984 — 8,677 17,850 1,262,208 1,280,058 Commercial portfolio 59,153 29,245 12,487 251,118 352,003 40,986,513 41,338,516 Residential 9,645 8,019 — 8,589 26,253 8,199,901 8,226,154 Home equity 4,971 1,652 — 22,934 29,557 1,449,863 1,479,420 Other consumer 100 141 — 200 441 54,111 54,552 Consumer portfolio 14,716 9,812 — 31,723 56,251 9,703,875 9,760,126 Total $ 73,869 $ 39,057 $ 12,487 $ 282,841 $ 408,254 $ 50,690,388 $ 51,098,642 At December 31, 2023 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Current Total Loans Commercial non-mortgage $ 2,270 $ 890 $ 94 $ 122,855 $ 126,109 $ 16,759,366 $ 16,885,475 Asset-based — — — 35,068 35,068 1,522,773 1,557,841 Commercial real estate 1,459 — 184 11,383 13,026 13,556,736 13,569,762 Multi-family 5,198 2,340 — — 7,538 7,580,432 7,587,970 Equipment financing 3,966 8 — 9,828 13,802 1,314,984 1,328,786 Commercial portfolio 12,893 3,238 278 179,134 195,543 40,734,291 40,929,834 Residential 14,894 6,218 — 5,704 26,816 8,201,107 8,227,923 Home equity 5,676 3,285 — 23,545 32,506 1,484,449 1,516,955 Other consumer 410 94 — 142 646 50,694 51,340 Consumer portfolio 20,980 9,597 — 29,391 59,968 9,736,250 9,796,218 Total $ 33,873 $ 12,835 $ 278 $ 208,525 $ 255,511 $ 50,470,541 $ 50,726,052 The following table provides additional information on non-accrual loans and leases: At March 31, 2024 At December 31, 2023 (In thousands) Non-accrual Non-accrual with No Allowance Non-accrual Non-accrual with No Allowance Commercial non-mortgage $ 193,294 $ 12,367 $ 122,855 $ 20,066 Asset-based 34,893 1,155 35,068 1,330 Commercial real estate 3,815 — 11,383 2,681 Multi-family 10,439 957 — — Equipment financing 8,677 376 9,828 1,584 Commercial portfolio 251,118 14,855 179,134 25,661 Residential 8,589 1,690 5,704 856 Home equity 22,934 11,546 23,545 12,471 Other consumer 200 38 142 49 Consumer portfolio 31,723 13,274 29,391 13,376 Total $ 282,841 $ 28,129 $ 208,525 $ 39,037 Additional interest income on non-accrual loans and leases that would have been recognized in the Condensed Consolidated Statements of Income had such loans and leases been current in accordance with their contractual terms was $10.8 million and $6.1 million for the three months ended March 31, 2024, and 2023, respectively. Allowance for Credit Losses on Loans and Leases The following table summarizes the change in the ACL on loans and leases by portfolio segment: At or for the three months ended March 31, 2024 2023 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 577,663 $ 58,074 $ 635,737 $ 533,125 $ 61,616 $ 594,741 Adoption of ASU No. 2022-02 — — — 7,704 (1,831) 5,873 Provision (benefit) 49,354 (6,160) 43,194 38,757 (936) 37,821 Charge-offs (38,461) (1,330) (39,791) (26,410) (1,098) (27,508) Recoveries 553 1,749 2,302 1,574 1,413 2,987 Balance, end of period $ 589,109 $ 52,333 $ 641,442 $ 554,750 $ 59,164 $ 613,914 Individually evaluated for credit losses 60,786 4,209 64,995 27,459 8,590 36,049 Collectively evaluated for credit losses $ 528,323 $ 48,124 $ 576,447 $ 527,291 $ 50,574 $ 577,865 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. An (8) “Substandard” rating has a well-defined weakness that jeopardizes the full repayment of the debt. A (9) “Doubtful” rating has all of the same weaknesses as a substandard 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 following tables summarize the amortized cost basis of commercial loans and leases by Composite Credit Risk Profile grade and origination year: At March 31, 2024 (In thousands) 2024 2023 2022 2021 2020 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Risk rating: Pass $ 663,424 $ 2,467,862 $ 3,900,425 $ 1,315,230 $ 686,594 $ 1,480,383 $ 5,511,758 $ 16,025,676 Special mention — 54,770 56,426 47,247 32,684 11,246 34,044 236,417 Substandard — 77,736 127,796 41,141 26,857 48,295 112,126 433,951 Doubtful — — — — — 26 — 26 Total commercial non-mortgage 663,424 2,600,368 4,084,647 1,403,618 746,135 1,539,950 5,657,928 16,696,070 Current period gross write-offs — 240 21,228 9,118 353 766 — 31,705 Asset-based: Risk rating: Pass 7,552 20,276 — — — 28,179 1,264,087 1,320,094 Special mention — 927 732 — — 3,497 16,527 21,683 Substandard — — — — — 1,152 149,957 151,109 Total asset-based 7,552 21,203 732 — — 32,828 1,430,571 1,492,886 Current period gross write-offs — — — — — — — — Commercial real estate: Risk rating: Pass 575,902 2,319,662 3,557,239 1,748,708 1,138,226 4,032,725 151,615 13,524,077 Special mention — 19,635 4,675 20,978 29,561 116,552 — 191,401 Substandard — 29,149 22,571 6,546 59,648 138,314 1,210 257,438 Total commercial real estate 575,902 2,368,446 3,584,485 1,776,232 1,227,435 4,287,591 152,825 13,972,916 Current period gross write-offs — — — 1,399 — 860 — 2,259 Multi-family: Risk rating: Pass 393,731 1,638,357 1,921,264 1,057,961 384,683 2,447,598 — 7,843,594 Special mention — — — — — 1,685 — 1,685 Substandard — — — — 359 50,948 — 51,307 Total multi-family 393,731 1,638,357 1,921,264 1,057,961 385,042 2,500,231 — 7,896,586 Current period gross write-offs — — — — — 1,128 — 1,128 Equipment financing: Risk rating: Pass 71,632 301,206 272,532 198,821 162,267 209,068 — 1,215,526 Special mention 52 16,448 3,207 5,938 229 8,368 — 34,242 Substandard 84 171 8,676 7,292 6,008 8,059 — 30,290 Total equipment financing 71,768 317,825 284,415 212,051 168,504 225,495 — 1,280,058 Current period gross write-offs — — — — — 3,369 — 3,369 Total commercial portfolio 1,712,377 6,946,199 9,875,543 4,449,862 2,527,116 8,586,095 7,241,324 41,338,516 Current period gross write-offs $ — $ 240 $ 21,228 $ 10,517 $ 353 $ 6,123 $ — $ 38,461 At December 31, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 2,602,444 $ 4,089,327 $ 1,371,139 $ 711,362 $ 610,199 $ 952,097 $ 5,970,588 $ 16,307,156 Special mention 15,184 60,240 61,235 33,111 — 720 48,561 219,051 Substandard 48,849 104,087 23,258 28,222 44,612 30,426 79,778 359,232 Doubtful — 8 — — 3 25 — 36 Total commercial non-mortgage 2,666,477 4,253,662 1,455,632 772,695 654,814 983,268 6,098,927 16,885,475 Current period gross write-offs 325 7,637 1,775 512 969 4,391 — 15,609 Asset-based: Pass 23,007 — — — 3,280 34,999 1,333,271 1,394,557 Special mention 651 763 — — 3,676 — 29,610 34,700 Substandard — — — — 1,330 — 127,254 128,584 Total asset-based 23,658 763 — — 8,286 34,999 1,490,135 1,557,841 Current period gross write-offs — — — — 13,189 3,900 — 17,089 Commercial real estate: Pass 2,265,428 3,502,425 1,831,005 1,195,732 1,193,642 3,112,770 176,668 13,277,670 Special mention 850 4,675 14,463 31,405 23,443 37,688 1,210 113,734 Substandard 25,802 16,179 9,545 15,418 58,602 52,812 — 178,358 Total commercial real estate 2,292,080 3,523,279 1,855,013 1,242,555 1,275,687 3,203,270 177,878 13,569,762 Current period gross write-offs 4,632 — 12,617 3,813 2,754 38,569 — 62,385 Multi-family: Pass 1,597,599 1,934,100 1,041,416 442,888 595,676 1,920,618 — 7,532,297 Special mention — — — — 260 35,942 — 36,202 Substandard — — — 364 11,563 7,544 — 19,471 Total multi-family 1,597,599 1,934,100 1,041,416 443,252 607,499 1,964,104 — 7,587,970 Current period gross write-offs — — — — — 3,447 — 3,447 Equipment financing: Pass 335,874 297,186 232,304 176,061 183,679 69,927 — 1,295,031 Special mention — — 116 — 90 — — 206 Substandard — 9,144 8,064 6,600 4,285 5,456 — 33,549 Total equipment financing 335,874 306,330 240,484 182,661 188,054 75,383 — 1,328,786 Current period gross write-offs — — — 2,633 3,304 42 — 5,979 Total commercial portfolio 6,915,688 10,018,134 4,592,545 2,641,163 2,734,340 6,261,024 7,766,940 40,929,834 Current period gross write-offs $ 4,957 $ 7,637 $ 14,392 $ 6,958 $ 20,216 $ 50,349 $ — $ 104,509 The following tables summarize the amortized cost basis of consumer loans by FICO score and origination year: At March 31, 2024 (In thousands) 2024 2023 2022 2021 2020 Prior Revolving Loans Amortized Cost Basis Total Residential: Risk rating: 800+ $ 31,773 $ 258,518 $ 876,330 $ 1,085,654 $ 425,046 $ 1,029,578 $ — $ 3,706,899 740-799 63,609 336,781 660,935 748,992 300,885 713,330 — 2,824,532 670-739 16,063 139,978 334,526 284,846 88,711 518,781 — 1,382,905 580-669 887 18,590 49,910 43,025 17,029 106,517 — 235,958 579 and below — 1,391 10,072 12,128 782 51,487 — 75,860 Total residential 112,332 755,258 1,931,773 2,174,645 832,453 2,419,693 — 8,226,154 Current period gross write-offs — — — — — 64 — 64 Home equity: Risk rating: 800+ 1,319 28,064 26,971 34,581 25,209 61,331 381,942 559,417 740-799 1,373 23,922 19,804 26,051 12,507 37,911 333,256 454,824 670-739 3,970 14,475 14,413 15,265 7,083 30,424 241,202 326,832 580-669 354 3,097 3,783 2,555 1,237 13,881 73,203 98,110 579 and below — 198 1,514 733 232 4,172 33,388 40,237 Total home equity 7,016 69,756 66,485 79,185 46,268 147,719 1,062,991 1,479,420 Current period gross write-offs — — — — — 177 — 177 Other consumer: Risk rating: 800+ 56 482 373 1,875 142 462 30,934 34,324 740-799 9 975 536 465 596 833 6,149 9,563 670-739 392 618 435 324 720 781 4,520 7,790 580-669 146 122 176 92 118 250 1,134 2,038 579 and below — 77 97 49 14 31 569 837 Total other consumer 603 2,274 1,617 2,805 1,590 2,357 43,306 54,552 Current period gross write-offs 890 — 11 18 26 144 — 1,089 Total consumer portfolio 119,951 827,288 1,999,875 2,256,635 880,311 2,569,769 1,106,297 9,760,126 Current period gross write-offs $ 890 $ — $ 11 $ 18 $ 26 $ 385 $ — $ 1,330 At December 31, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Residential: Risk rating: 800+ $ 214,446 $ 847,009 $ 1,096,109 $ 451,307 $ 141,919 $ 910,117 $ — $ 3,660,907 740-799 363,696 703,568 755,750 279,946 112,303 633,578 — 2,848,841 670-739 137,460 293,699 292,255 95,838 48,412 346,663 — 1,214,327 580-669 20,208 52,962 45,770 14,840 10,492 106,497 — 250,769 579 and below 6,909 52,690 11,749 1,345 128,714 51,672 — 253,079 Total residential 742,719 1,949,928 2,201,633 843,276 441,840 2,048,527 — 8,227,923 Current period gross write-offs — — 387 — 153 4,630 — 5,170 Home equity: Risk rating: 800+ 27,047 27,439 35,927 25,586 8,110 56,062 391,616 571,787 740-799 24,772 20,069 27,147 13,888 5,158 34,190 355,926 481,150 670-739 15,857 15,655 15,389 5,992 3,189 29,454 242,189 327,725 580-669 3,080 3,786 1,991 1,658 1,115 9,988 70,102 91,720 579 and below 696 1,109 1,079 576 552 6,319 34,242 44,573 Total home equity 71,452 68,058 81,533 47,700 18,124 136,013 1,094,075 1,516,955 Current period gross write-offs — 4 81 — 104 3,114 — 3,303 Other consumer: Risk rating: 800+ 432 356 1,913 189 255 77 25,699 28,921 740-799 1,318 586 486 730 690 381 7,180 11,371 670-739 526 570 358 981 1,210 79 3,549 7,273 580-669 69 169 129 153 303 56 1,983 2,862 579 and below 125 97 61 11 28 1 590 913 Total other consumer 2,470 1,778 2,947 2,064 2,486 594 39,001 51,340 Current period gross write-offs 3,263 7 2 218 377 363 — 4,230 Total consumer portfolio 816,641 2,019,764 2,286,113 893,040 462,450 2,185,134 1,133,076 9,796,218 Current period gross write-offs $ 3,263 $ 11 $ 470 $ 218 $ 634 $ 8,107 $ — $ 12,703 Collateral Dependent Loans and Leases A non-accrual loan or lease is considered collateral dependent when the borrower is experiencing financial difficulty and when repayment is substantially expected to be provided through the operation or sale of collateral. Commercial non-mortgage loans, At March 31, 2024, and December 31, 2023, the carrying amount of collateral dependent loans was $50.0 million and $66.1 million, respectively, for commercial loans and leases, and $23.8 million and $22.7 million, respectively, for consumer loans. The ACL for collateral dependent loans and leases is individually assessed based on the fair value of the collateral less costs to sell at the reporting date. At March 31, 2024, and December 31, 2023, the collateral value associated with collateral dependent loans and leases was $78.1 million and $93.7 million, respectively. Modifications to Borrowers Experiencing Financial Difficulty In certain circumstances, the Company enters into agreements to modify the terms of loans to borrowers experiencing financial difficulty. A variety of solutions are offered to borrowers experiencing financial difficulty, including loan modifications that may result in principal forgiveness, interest rate reductions, payment delays, term extensions, or a combination thereof. The following is a description of each of these types of modifications: • Principal forgiveness – The outstanding principal balance of a loan may be reduced by a specified amount. Principal forgiveness may occur voluntarily as part of a negotiated agreement with a borrower, or involuntarily through a bankruptcy proceeding. • Interest rate reductions – Includes modifications where the contractual interest rate of the loan has been reduced. • Payment delays – Deferral arrangements that allow borrowers to delay a scheduled loan payment to a later date. Deferred loan payments do not affect the original contractual maturity terms of the loan. Modifications that result in only an insignificant payment delay are not disclosed. The Company generally considers a payment delay of three months or less to be insignificant. • Term extensions – Extensions of the original contractual maturity date of the loan. • Combination – Combination includes loans that have undergone more than one of the above loan modification types. Significant judgment is required to determine if a borrower is experiencing financial difficulty. These considerations vary by portfolio class. The Company has identified modifications to borrowers experiencing financial difficulty that are included in its disclosures as follows: • Commercial: The Company evaluates modifications of loans to commercial borrowers that are rated substandard or worse, and includes the modifications in its disclosures to the extent that the modification is considered • Consumer: The Company generally evaluates all modifications of loans to consumer borrowers subject to its loss mitigation program and includes them in its disclosures to the extent that the modification is considered other-than-insignificant. The following tables summarize the amortized cost basis at March 31, 2024, and 2023, of loans modified to borrowers experiencing financial difficulty, disaggregated by class and type of concession granted: For the three months ended March 31, 2024 (In thousands) Interest Rate Reduction Term Extension Payment Delay Combination - Term Extension and Interest Rate Reduction Total % of Total Class (2) Commercial non-mortgage $ 1,934 $ 18,124 $ 50,038 $ 1,099 $ 71,195 0.4 % Asset-based — 1,667 — — 1,667 0.1 Commercial real estate — 7,753 — — 7,753 0.1 Multi-family — 49,990 — — 49,990 0.6 Equipment financing — 556 — — 556 — Residential 629 — — 135 764 — Home equity — — — 65 65 — Total (1) $ 2,563 $ 78,090 $ 50,038 $ 1,299 $ 131,990 0.3 % For the three months ended March 31, 2023 (In thousands) Interest Rate Reduction Term Extension Combination - Total % of Total Class (2) Commercial non-mortgage $ 7 $ 29,884 $ — $ 29,891 0.2 % Commercial real estate — 17,116 — 17,116 0.1 Home equity — 57 64 121 — Total (1) $ 7 $ 47,057 $ 64 $ 47,128 0.1 % (1) The total amortized cost excludes accrued interest receivable of $0.8 million and $0.2 million at March 31, 2024, and 2023, respectively. (2) Represents the total amortized cost of the loans modified as a percentage of the total period end loan balance by class. The following tables describe the financial effect of the modifications made to borrowers experiencing financial difficulty: For the three months ended March 31, 2024 Financial Effect (1) Interest Rate Reduction: Commercial non-mortgage Reduced weighted average interest rate by 2.5% Term Extension: Commercial non-mortgage Extended term by a weighted average of 0.5 years Asset-based Extended term by a weighted average of 0.3 years Commercial real estate Extended term by a weighted average of 0.3 years Multi-family Extended term by a weighted average of 0.7 years Payment Delay: Commercial non-mortgage Provided payment deferrals for a weighted average of 0.5 years For the three months ended March 31, 2023 Financial Effect Interest Rate Reduction: Commercial non-mortgage Reduced weighted average interest rate by 4.5% Term Extension: Commercial non-mortgage Extended term by a weighted average of 0.6 years Commercial real estate Extended term by a weighted average of 1.0 year Home equity Extended term by a weighted average of 8.8 years Combination - Term Extension and Interest Rate Reduction: Home equity Extended term by a weighted average of 5.1 years and reduced weighted average interest rate by 1.5% (1) Certain disclosures related to financial effects of modifications do not include those deemed to be immaterial. The Company closely monitors the performance of the loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following tables summarize the aging of loans that had been modified in the twelve months preceding March 31, 2024, and in the three months ended March 31, 2023: At March 31, 2024 (In thousands) Current 30-59 Days 60-89 Days 90+ Days Non-Accrual Total Commercial non-mortgage $ 77,451 $ — $ 19 $ — $ 97,587 $ 175,057 Asset-based 42,331 — — — — 42,331 Commercial real estate 24,859 — — — 169 25,028 Multi-family — 18,103 22,406 — 9,481 49,990 Equipment financing 1,762 — — — 317 2,079 Residential 1,258 — — — 764 2,022 Home equity 510 — — — 86 596 Total $ 148,171 $ 18,103 $ 22,425 $ — $ 108,404 $ 297,103 At March 31, 2023 (In thousands) Current 30-59 Days 60-89 Days 90+ Days Non-Accrual Total Commercial non-mortgage $ 3,562 $ — $ — $ — $ 26,329 $ 29,891 Commercial real estate 17,116 — — — — 17,116 Home equity 23 — — — 98 121 Total $ 20,701 $ — $ — $ — $ 26,427 $ 47,128 There were $17.8 million of commercial non-mortgage loans made to borrowers experiencing financial difficulty that were modified in the preceding twelve months and that subsequently defaulted during the three months ended March 31, 2024. Loans made to borrowers experiencing financial difficulty that were both modified during the three months ended March 31, 2023, and that subsequently defaulted were not significant. For the purposes of this disclosure, a payment default is defined as 90 or more days past due and accruing. Non-accrual loans that are modified to borrowers experiencing financial difficulty remain on non-accrual status until the borrower has demonstrated performance under the modified terms. Commitments to lend additional funds to borrowers experiencing financial difficulty whose loans had been modified were not significant.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2024
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: (In thousands) At March 31, At December 31, Balance, beginning of period $ 2,631,465 $ 2,514,104 Ametros acquisition (1) 236,603 — interLINK acquisition — 143,216 Bend acquisition — (294) Sterling merger — (25,561) Balance, end of period $ 2,868,068 $ 2,631,465 (1) Reflects the $228.2 million of preliminary goodwill recorded in connection with the Ametros acquisition in January 2024, and $8.4 million of other adjustments. Information regarding goodwill by reportable segment can be found within Note 14: Segment Reporting. Other Intangible Assets The following table summarizes other intangible assets: At March 31, 2024 At December 31, 2023 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposits (1) $ 328,837 $ 59,239 $ 269,598 $ 146,037 $ 53,986 $ 92,051 Customer relationships 151,000 46,654 104,346 151,000 43,116 107,884 Non-competition agreement 4,000 1,000 3,000 4,000 800 3,200 Trade name (1) 6,100 203 5,897 — — — Total other intangible assets $ 489,937 $ 107,096 $ 382,841 $ 301,037 $ 97,902 $ 203,135 (1) The increase in the gross carrying amount is due to the Ametros acquisition in January 2024, which resulted in the identification and recognition of a $182.8 million core deposit intangible asset and a $6.1 million trade name. The remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) At March 31, 2024 (1) Remainder of 2024 $ 25,480 2025 31,094 2026 30,113 2027 29,558 2028 26,687 Thereafter 190,258 (1) As previously discussed in Note 2: Business Developments, the Company initiated a plan to actively sell its payroll finance and factored receivables loan portfolio, along with the related customer relationship intangible assets, in March 2024. The aggregate net carrying amount of the related customer relationship intangible assets was $49.7 million at March 31, 2024, and has been excluded from the Company’s estimate of remaining future amortization expense.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2024
Deposit Liabilities [Abstract]
Deposits	Deposits The following table summarizes deposits by type: (In thousands) At March 31, At December 31, Non-interest-bearing: Demand $ 10,212,509 $ 10,732,516 Interest-bearing: Health savings accounts 8,603,184 8,287,889 Checking 9,498,036 8,994,095 Money market 18,615,031 17,662,826 Savings 6,881,663 6,642,499 Time deposits 6,937,320 8,464,459 Total interest-bearing $ 50,535,234 $ 50,051,768 Total deposits $ 60,747,743 $ 60,784,284 Time deposits, money market, and interest-bearing checking obtained through brokers (1) $ 1,778,381 $ 3,673,733 Aggregate amount of time deposit accounts that exceeded the FDIC limit 1,348,498 1,221,887 Demand deposit overdrafts reclassified as loan balances 12,251 10,432 (1) Excludes $5.8 billion and $5.7 billion of money market sweep deposits received through interLINK at March 31, 2024, and December 31, 2023, respectively. The following table summarizes the scheduled maturities of time deposits: (In thousands) At March 31, Remainder of 2024 $ 6,406,380 2025 414,440 2026 56,451 2027 33,809 2028 20,873 Thereafter 5,367 Total time deposits $ 6,937,320

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table summarizes securities sold under agreements to repurchase and other borrowings: At March 31, 2024 At December 31, 2023 (Dollars in thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) $ 126,886 0.12 % $ 358,387 3.43 % Federal funds purchased 235,000 5.44 100,000 5.48 Securities sold under agreements to repurchase and other borrowings $ 361,886 3.58 % $ 458,387 3.88 % (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. Securities sold under agreements to repurchase, all of which have an original maturity of one year or less for the periods presented, 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 March 31, 2024 At December 31, 2023 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 3,650,000 5.50 % $ 2,350,000 5.53 % After 1 but within 2 years — — — — After 2 but within 3 years — — — — After 3 but within 4 years 456 1.36 235 — After 4 but within 5 years — — 228 2.75 After 5 years 9,474 2.08 9,555 2.07 Total FHLB advances $ 3,659,930 5.49 % $ 2,360,018 5.52 % Aggregate market value of assets pledged as collateral $ 20,238,325 $ 20,734,035 Remaining borrowing capacity at FHLB 10,779,412 12,535,423 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, CMBS, Agency MBS, Agency CMO, U.S. Treasury notes, and MBS. The Bank was in compliance with its FHLB collateral requirements at both March 31, 2024, and December 31, 2023. The following table summarizes long-term debt: (Dollars in thousands) At March 31, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 $ — $ 132,550 4.100% Senior fixed-rate notes due March 25, 2029 (2) 326,766 328,104 4.000% Subordinated fixed-to-floating rate notes due December 30, 2029 274,000 274,000 3.875% Subordinated fixed-to-floating rate notes due November 1, 2030 225,000 225,000 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (3) 77,320 77,320 Total senior and subordinated debt 903,086 1,036,974 Discount on senior fixed-rate notes (498) (537) Debt issuance cost on senior fixed-rate notes (1,337) (1,419) Premium on subordinated fixed-to-floating rate notes 13,269 13,802 Long-term debt (1) $ 914,520 $ 1,048,820 (1) The classification of debt as long-term is based on the initial terms of greater than one year as of the date of issuance. (2) The Company de-designated its fair value hedging relationship on these senior fixed-rate notes in 2020. A basis adjustment of $26.8 million and $28.1 million at March 31, 2024, and December 31, 2023, respectively, is included in the carrying value and is being amortized over the remaining life of the senior fixed-rate notes. (3)

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income, Net of Tax	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	Accumulated Other Comprehensive (Loss), Net of Tax The following tables summarize the changes in each component of accumulated other comprehensive (loss), net of tax: Three months ended March 31, 2024 (In thousands) Investment Securities Available-for-Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (517,450) $ (2,869) $ (30,252) $ (550,571) Other comprehensive (loss) income before reclassifications (45,392) (30,291) 251 (75,432) Amounts reclassified from accumulated other comprehensive (loss) 9,121 302 479 9,902 Other comprehensive (loss) income, net of tax (36,271) (29,989) 730 (65,530) Balance, end of period $ (553,721) $ (32,858) $ (29,522) $ (616,101) Three months ended March 31, 2023 (In thousands) Investment Securities Available-for-Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (631,160) $ (8,874) $ (44,926) $ (684,960) Other comprehensive income before reclassifications 56,635 20,782 3,553 80,970 Amounts reclassified from accumulated other comprehensive (loss) 14,983 592 395 15,970 Other comprehensive income, net of tax 71,618 21,374 3,948 96,940 Balance, end of period $ (559,542) $ 12,500 $ (40,978) $ (588,020) The following table further summarizes the amounts reclassified from accumulated other comprehensive (loss): Accumulated Other Comprehensive Three months ended Associated Line Item on the March 31, 2024 2023 (In thousands) Investment securities available-for-sale: Net unrealized holding (losses) $ (12,396) $ (20,483) (Loss) on sale of investment securities, net (1) Tax benefit 3,275 5,500 Income tax expense Net of tax $ (9,121) $ (14,983) Derivative instruments: Hedge terminations $ (34) $ (76) Interest expense Premium amortization (272) (736) Interest income Tax benefit 4 220 Income tax expense Net of tax $ (302) $ (592) Defined benefit pension and other postretirement benefit plans: Actuarial net loss amortization $ (657) $ (542) Other expense Tax benefit 178 147 Income tax expense Net of tax $ (479) $ (395) (1)

Regulatory Capital and Restrict

Regulatory Capital and Restrictions	3 Months Ended
	Mar. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Capital and Restrictions	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 (applies 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 Basel III to ensure capital adequacy require the Holding Company and the Bank to maintain minimum ratios of CET1 Risk-Based Capital, Tier 1 Risk-Based Capital, Total Risk-Based Capital, and 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. At the time of initial adoption of the Basel III Capital Rules, the Company had 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 qualifying subordinated debt and the permissible portion of the ACL. At March 31, 2024, and December 31, 2023, both the Holding Company and the Bank were classified as well-capitalized. Management believes that no events or changes have occurred subsequent to period end that would change this designation. The following tables provides information on the capital ratios for the Holding Company and the Bank: At March 31, 2024 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 Risk-Based Capital $ 5,923,041 10.57 % $ 2,521,412 4.5 % $ 3,642,040 6.5 % Tier 1 Risk-Based Capital 6,207,020 11.08 3,361,883 6.0 4,482,510 8.0 Total Risk-Based Capital 7,400,017 13.21 4,482,510 8.0 5,603,138 10.0 Tier 1 Leverage Capital 6,207,020 8.51 2,916,558 4.0 3,645,697 5.0 Webster Bank CET1 Risk-Based Capital $ 6,588,389 11.78 % $ 2,516,948 4.5 % $ 3,635,591 6.5 % Tier 1 Risk-Based Capital 6,588,389 11.78 3,355,930 6.0 4,474,574 8.0 Total Risk-Based Capital 7,191,796 12.86 4,474,574 8.0 5,593,217 10.0 Tier 1 Leverage Capital 6,588,389 9.04 2,913,783 4.0 3,642,229 5.0 At December 31, 2023 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 Risk-Based Capital $ 6,188,433 11.11 % $ 2,507,190 4.5 % $ 3,621,497 6.5 % Tier 1 Risk-Based Capital 6,472,412 11.62 3,342,920 6.0 4,457,227 8.0 Total Risk-Based Capital 7,643,423 13.72 4,457,227 8.0 5,571,534 10.0 Tier 1 Leverage Capital 6,472,412 9.06 2,857,890 4.0 3,572,362 5.0 Webster Bank CET1 Risk-Based Capital $ 6,913,443 12.43 % $ 2,502,835 4.5 % $ 3,615,206 6.5 % Tier 1 Risk-Based Capital 6,913,443 12.43 3,337,113 6.0 4,449,484 8.0 Total Risk-Based Capital 7,494,332 13.47 4,449,484 8.0 5,561,855 10.0 Tier 1 Leverage Capital 6,913,443 9.69 2,855,212 4.0 3,569,015 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. During the three-year transition period, regulatory capital ratios will phase out the aggregate amount of the regulatory capital benefit provided from the delayed CECL adoption in the initial two years. For 2022, 2023, and 2024, the Company is allowed 75%, 50%, and 25%, respectively, of the regulatory capital benefit as of December 31, 2021, 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 $175.0 million and $150.0 million in dividends for the three months ended March 31, 2024, and 2023, respectively, for which no express approval from the OCC was required. Cash Restrictions

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2024
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 in the Notes to Consolidated Financial Statements contained in Part II - Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. 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 in 2022, 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. 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 Condensed Consolidated Balance Sheets. Investment earnings and any changes in fair value are included in Other income on the accompanying Condensed Consolidated Statements of Income. Additional information regarding the Rabbi Trusts' investments can be found within Note 13: Fair Value Measurements. Non-Consolidated Low Income Housing Tax Credit 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. 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: (In thousands) March 31, 2024 December 31, 2023 Gross investment in LIHTC investments $ 1,293,847 $ 1,135,192 Accumulated amortization (161,612) (141,199) Net investment in LIHTC investments $ 1,132,235 $ 993,993 Unfunded commitments for LIHTC investments $ 683,133 $ 549,258 The aggregate carrying value of the Company’s LIHTC investments and the related unfunded commitments are included in Accrued interest receivable and other assets and Accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets, respectively. The Company’s maximum exposure to loss related to its LIHTC investments is generally the aggregate carrying value as of each reporting date. However, income tax credits recognized related to these investments are subject to recapture by taxing authorities for up to a period of 15 years based on compliance provisions that are required to be met at the project level. During the three months ended March 31, 2024, and 2023, there were $158.7 million and zero of net commitments approved to fund LIHTC investments, respectively. The following table summarizes the amount of income tax credits and other income tax benefits, and investment amortization generated from the Company’s LIHTC investments, which are recognized as a component of income tax expense (benefit): Three months ended March 31, (In thousands) 2024 2023 Income tax credits and other income tax benefits from LIHTC investments $ (28,024) $ (21,898) Investment amortization from LIHTC investments 20,413 21,478 Both the income tax credits and other income tax benefits, and investment amortization generated from the Company’s LIHTC investments, are included as a component of operating activities on the Condensed Consolidated Statements of Cash Flows. 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 Condensed Consolidated Balance Sheets, and the related interest expense is included in Long-term debt on the accompanying Condensed Consolidated Statements of Income. Additional information regarding these junior subordinated debentures can be found within Note 7: Borrowings. Other Non-Marketable Investments. The Company invests in alternative investments comprising interests in non-public entities that cannot be redeemed since the underlying equity is distributed as the investment 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 non-marketable investments was $193.2 million and $190.1 million at March 31, 2024, and December 31, 2023, respectively, which is included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets, and its maximum exposure to loss, including unfunded commitments, was $306.3 million and $307.2 million, respectively. Additional information regarding the fair value of other non-marketable investments can be found within

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2024
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: Three months ended March 31, (In thousands, except per share data) 2024 2023 Net income $ 216,323 $ 221,004 Less: Preferred stock dividends 4,163 4,163 Net income available to common stockholders 212,160 216,841 Less: Earnings allocated to participating securities 2,101 1,845 Earnings applicable to common stockholders $ 210,059 $ 214,996 Weighted-average common shares outstanding - basic 170,445 172,766 Add: Effect of dilutive stock options and restricted stock 259 117 Weighted-average common shares outstanding - diluted 170,704 172,883 Basic earnings per common share $ 1.23 $ 1.24 Diluted earnings per common share 1.23 1.24 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 non-forfeitable dividends during the vesting period on a basis equivalent to the dividends paid to holders of common stock. These unvested awards meet the definition of participating securities.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Derivative Positions and Offsetting Derivatives Designated as Hedging Instruments . Interest rate swaps allow the Company to change the fixed or variable nature of an interest rate without the exchange of the underlying notional amount. Certain pay fixed/receive variable interest rate swaps are designated as cash flow hedges to effectively convert variable-rate debt into fixed-rate debt, whereas certain receive fixed/pay variable interest rate swaps are designated as fair value hedges to effectively convert fixed-rate long-term debt into variable-rate debt. Certain purchased options are also designated as cash flow hedges. Purchased options allow the Company to limit the potential adverse impact of variable interest rates by establishing a cap rate or floor rate in exchange for an upfront premium. The purchased options designated as cash flow hedges represent interest rate caps where payment is received from the counterparty if interest rates rise above the cap rate, and interest rate floors where payment is received from the counterparty when interest rates fall below the floor rate. Derivatives Not Designated as Hedging Instruments. The Company also enters into other derivative transactions to manage economic risks, but does not designate the instruments in hedge relationships. In addition, the Company enters into derivative contracts to accommodate customer needs. Derivative contracts with customers are offset with dealer counterparty transactions structured with matching terms to ensure minimal impact on earnings. The following tables present the notional amounts and fair values, including accrued interest, of derivative positions: At March 31, 2024 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 500,000 $ 263 $ 4,750,000 $ 44,366 Not designated as hedging instruments: Interest rate derivatives (1) 8,542,883 362,602 8,542,895 362,802 Mortgage banking derivatives (2) 1,463 15 — — Other (3) 364,396 662 744,777 225 Total not designated as hedging instruments 8,908,742 363,279 9,287,672 363,027 Gross derivative instruments, before netting $ 9,408,742 363,542 $ 14,037,672 407,393 Less: Master netting agreements 61,395 61,395 Cash collateral received/paid 285,297 — Total derivative instruments, after netting $ 16,850 $ 345,998 At December 31, 2023 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 2,750,000 $ 11,140 $ 2,700,000 $ 13,679 Not designated as hedging instruments: Interest rate derivatives (1) 8,284,356 319,122 8,272,197 321,064 Mortgage banking derivatives (2) 2,798 37 — — Other (3) 340,553 337 731,055 1,067 Total not designated as hedging instruments 8,627,707 319,496 9,003,252 322,131 Gross derivative instruments, before netting $ 11,377,707 330,636 $ 11,703,252 335,810 Less: Master netting agreements 55,949 55,949 Cash collateral received/paid 232,190 — Total derivative instruments, after netting $ 42,497 $ 279,861 (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. Notional amounts of interest rate swaps cleared through clearing houses included $91.0 million and $113.8 million for asset derivatives at March 31, 2024, and December 31, 2023, respectively. The related fair values approximated zero. There were no interest rate swaps cleared through clearing houses for liability derivatives at both March 31, 2024, and December 31, 2023. (2) Notional amounts related to residential loans excluded approved floating rate commitments of $1.7 million and $1.0 million at March 31, 2024, and December 31, 2023, respectively. (3) Other derivatives include foreign currency forward contracts related to lending arrangements, a Visa equity swap transaction, and risk participation agreements. Notional amounts of risk participation agreements included $300.5 million and $299.2 million for asset derivatives and $707.6 million and $682.9 million for liability derivatives at March 31, 2024, and December 31, 2023, respectively, which had insignificant related fair values. The following tables represent the off-setting derivative financial instruments that are subject to matter netting agreements: At March 31, 2024 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Paid Net Amount Presented Asset derivatives $ 346,853 $ 61,395 $ 285,297 $ 161 Liability derivatives 61,395 61,395 — — At December 31, 2023 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Paid Net Amount Presented Asset derivatives $ 289,778 $ 55,949 $ 232,190 $ 1,639 Liability derivatives 55,949 55,949 — — Derivative Activity The following table summarizes the income statement effect of derivatives designated as hedging instruments: Recognized In Three months ended March 31, (In thousands) Net Interest Income 2024 2023 Fair value hedges: Interest rate derivatives Deposits interest expense $ (1,320) $ (10,235) Hedged item Deposits interest expense — 10,427 Net recognized on fair value hedges (1) $ 1,320 $ (192) Cash flow hedges: Interest rate derivatives Long-term debt interest expense $ 34 $ 76 Interest rate derivatives Interest and fees on loans and leases (10,764) (736) Net recognized on cash flow hedges $ (10,798) $ (812) (1) The Company de-designated its fair value hedging relationship on $400.0 million of deposits, which pertained to a portion of Ametros ’ member deposits, in 2023. The $1.3 million basis adjustment included in the carrying amount of deposits at December 31, 2023, was amortized into interest expense in January 2024 upon the acquisition of Ametros. Time-value premiums, which are amortized on a straight-line basis, are excluded from the assessment of hedge effectiveness for purchased options designated as cash flow hedges. The remaining unamortized balance of time-value premiums at March 31, 2024, was $0.3 million. Over the next twelve months, an estimated $30.4 million decrease to interest income will be reclassified from (AOCL) relating to cash flow hedge gain/loss. The maximum length of time over which forecasted transactions are hedged is 3.0 years. Additional information regarding cash flow hedge activity impacting (AOCL) and the related amounts reclassified to net income can be found within Note 8: Accumulated Other Comprehensive (Loss), Net of Tax. The following table summarizes the income statement effect of derivatives not designated as hedging instruments: Recognized In Three months ended March 31, (In thousands) Non-interest Income 2024 2023 Interest rate derivatives Other income $ 1,290 $ (3,687) Mortgage banking derivatives Mortgage banking activities (22) (16) Other Other income 1,277 (735) Total not designated as hedging instruments $ 2,545 $ (4,438) Derivative Exposure. At March 31, 2024, the Company had $2.3 million in initial margin posted at clearing houses, and $290.3 million of cash collateral received included in Cash and due from banks on the accompanying Condensed Consolidated Balance Sheets. The Company regularly evaluates the credit risk of its derivative customers, taking into account the likelihood of default, net exposures, and remaining contractual life, among other related factors. Credit risk exposure is mitigated as transactions with customers are generally secured by the same collateral of the underlying transactions. The current net credit exposure relating to derivative contracts with customers was $16.7 million at March 31, 2024. In addition, the Company also monitors potential future exposure, representing its best estimate of exposure to remaining contractual maturity. The potential future exposure relating to derivative contracts with customers was $112.0 million at March 31, 2024. The Company has incorporated a credit valuation adjustment (contra-liability) to reflect non-performance risk in the fair value measurement of its derivatives, which totaled $7.5 million and $6.2 million at March 31, 2024, and December 31, 2023, respectively. Various factors impact changes in the valuation adjustment over time, such as changes in the credit spreads of the contracted parties, and changes in market rates and volatilities, which affect the total expected exposure of the derivative instruments.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2024
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 Available-for-Sale Securities. When unadjusted quoted prices are available in an active market, the Company classifies its available-for-sale investment securities 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. Government agency debentures, Municipal bonds and notes, Agency CMO, Agency MBS, Agency CMBS, CMBS, CLO, Corporate debt, Private label MBS, and Other available-for-sale 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 dealer counterparties. 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 UPB of originated loans held for sale: At March 31, 2024 At December 31, 2023 (In thousands) Fair Value UPB Difference Fair Value UPB Difference Originated loans held for sale $ 323 $ 316 $ 7 $ 2,610 $ 2,658 $ (48) 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. Accordingly, the Rabbi Trusts’ investments are classified within Level 1 of the fair value hierarchy. At both March 31, 2024, and December 31, 2023, the total cost basis of the investments held in the Rabbi Trusts was $9.2 million. 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 March 31, 2024, and December 31, 2023, equity investments with a readily determinable fair value had a total carrying amount of $1.2 million and $0.9 million, respectively, with no remaining unfunded commitment. During the three months ended March 31, 2024, there were total write-ups in fair value of $0.3 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 March 31, 2024, and December 31, 2023, these alternative investments had a total carrying amount of $38.6 million and $35.9 million, respectively, and a remaining unfunded commitment of $27.9 million and $29.8 million, respectively. Contingent Consideration. The Company recorded $16.0 million of contingent consideration at fair value related to two earn-out agreements associated with the acquisition of interLINK on January 11, 2023. The terms of the purchase agreement specified that the seller would receive earn-outs based on the ability of the Company to: (i) re-sign the existing broker dealers under contract, and (ii) generate $2.5 billion in new broker dealer deposit programs within three years of the acquisition date. The estimated fair values of the contingent consideration liabilities are measured on a recurring basis and determined using an income approach considering management’s evaluation of the probability of achievement, forecasted achievement date (payment term), and a discount rate equivalent to the counterparty cost of debt. These significant inputs, which are the responsibility of management and calculated with the assistance of a third-party valuation specialist, are not observable, and accordingly, are classified within Level 3 of the fair value hierarchy. The following tables summarize the unobservable inputs used to derive the estimated fair value of the Company’s contingent consideration liabilities (dollars in thousands): At March 31, 2024 Agreement Maximum Amount Probability of Achievement Payment Term Discount Rate Fair Value (i) Re-sign broker dealers (1) $ 207 99.0 % 1.63 6.40 % $ 182 (ii) Deposit program growth $ 12,500 100.0 % 0.75 6.40 % $ 11,568 At December 31, 2023 Agreement Maximum Amount Probability of Achievement Payment Term Discount Rate Fair Value (i) Re-sign broker dealers (1) $ 4,826 99.0 % 1.88 6.40 % $ 4,232 (ii) Deposit program growth $ 12,500 100.0 % 1.00 6.40 % $ 11,568 (1) The Company re-signed one of the existing broker dealers under contract in January 2024, which resulted in the cash payment of $4.6 million during the three months ended March 31, 2024, to settle a portion of its contingent consideration obligation with StoneCastle Partners LLC in accordance with the purchase agreement. Contingent consideration liabilities are included within Accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets. Any fair value adjustments to contingent consideration liabilities are included in Other expense on the accompanying Condensed Consolidated Statements of Income. The following tables summarize the fair values of assets and liabilities measured at fair value on a recurring basis: At March 31, 2024 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: Government agency debentures $ — $ 262,488 $ — $ 262,488 Municipal bonds and notes — 1,207,350 — 1,207,350 Agency CMO — 46,236 — 46,236 Agency MBS — 3,364,414 — 3,364,414 Agency CMBS — 2,321,230 — 2,321,230 CMBS — 731,851 — 731,851 Corporate debt — 617,209 — 617,209 Private label MBS — 41,308 — 41,308 Other — 9,055 — 9,055 Total available-for-sale securities — 8,601,141 — 8,601,141 Gross derivative instruments, before netting (1) 594 362,948 — 363,542 Originated loans held for sale — 323 — 323 Investments held in Rabbi Trusts 12,545 — — 12,545 Alternative investments 1,221 — — 1,221 Alternative investments measured at NAV (2) — — — 38,620 Total financial assets $ 14,360 $ 8,964,412 $ — $ 9,017,392 Financial Liabilities: Gross derivative instruments, before netting (1) $ 160 $ 407,233 $ — $ 407,393 Contingent consideration — — 11,750 11,750 Total financial liabilities $ 160 $ 407,233 $ 11,750 $ 419,143 At December 31, 2023 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: Government agency debentures $ — $ 264,633 $ — $ 264,633 Municipal bonds and notes — 1,573,233 — 1,573,233 Agency CMO — 48,941 — 48,941 Agency MBS — 3,347,098 — 3,347,098 Agency CMBS — 2,288,071 — 2,288,071 CMBS — 763,749 — 763,749 Corporate debt — 622,155 — 622,155 Private label MBS — 42,808 — 42,808 Other — 9,041 — 9,041 Total available-for-sale securities — 8,959,729 — 8,959,729 Gross derivative instruments, before netting (1) 217 330,419 — 330,636 Originated loans held for sale — 2,610 — 2,610 Investments held in Rabbi Trusts 11,900 — — 11,900 Alternative investments 959 — — 959 Alternative investments measured at NAV (2) — — — 35,888 Total financial assets $ 13,076 $ 9,292,758 $ — $ 9,341,722 Financial Liabilities: Gross derivative instruments, before netting (1) $ 970 $ 334,840 $ — $ 335,810 Contingent consideration — — 15,800 15,800 Total financial liabilities $ 970 $ 334,840 $ 15,800 $ 351,610 (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 within Note 12: 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 the 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 March 31, 2024, and December 31, 2023, the carrying amount of these alternative investments was $55.3 million and $53.1 million, respectively, of which $1.4 million and $7.9 million, respectively, were considered to be measured at fair value. During the three months ended March 31, 2024, there was $1.7 million in total 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 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 March 31, 2024, and December 31, 2023, there were $239.3 million and $3.9 million loans that were transferred to held for sale on the Condensed Consolidated Balance Sheet, respectively. 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. Other Real Estate Owned 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 March 31, 2024, and December 31, 2023, the total carrying value of OREO and repossessed assets was $5.6 million and $9.1 million, respectively. In addition, the amortized cost of consumer loans secured by residential real estate property that were in process of foreclosure at March 31, 2024, was $9.1 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. Held-to-Maturity 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 prepayment 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. Held-to-maturity 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 discount 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. Federal Home Loan Bank Advances and Long-Term Debt . The fair value of FHLB advances and long-term debt is estimated using a discounted cash flow 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 March 31, 2024 At December 31, 2023 (In thousands) Carrying Fair Carrying Fair Assets: Level 1 Cash and cash equivalents $ 1,545,228 $ 1,545,228 $ 1,715,795 $ 1,715,795 Level 2 Held-to-maturity investment securities, net 7,679,891 6,782,867 7,074,588 6,264,623 Level 3 Loans and leases, net 50,457,200 48,348,067 50,090,315 48,048,106 Mortgage servicing rights 1,514 3,973 8,523 24,495 Liabilities: Level 2 Deposit liabilities $ 53,810,423 $ 53,810,423 $ 52,319,825 $ 52,319,825 Time deposits 6,937,320 6,902,736 8,464,459 8,426,708 Securities sold under agreements to repurchase and other borrowings 361,886 361,867 458,387 458,380 FHLB advances 3,659,930 3,657,612 2,360,018 2,358,381 Long-term debt (1) 914,520 852,877 1,048,820 999,918 (1)

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company has three reportable segments, which reflect its primary differentiated lines of business: Commercial Banking, Healthcare Financial Services, and Consumer Banking. Segment performance is evaluated using PPNR, or PTNR, as appropriate. Certain Treasury activities and other functional divisions, such as information technology, human resources, risk management, bank operations, and the operations of interLINK, as well as amounts required to reconcile non-GAAP profitability metrics to those reported in accordance with GAAP, are included in the Corporate and Reconciling category. Effective January 1, 2024, the Company realigned certain of its Business Banking operations to better serve its customers and deliver operational efficiencies. Under this realignment, $1.5 billion of loans and $2.2 billion of deposits were reassigned, and $77.2 million of goodwill was reallocated on a relative fair value basis, from Commercial Banking to Consumer Banking. There was no goodwill impairment as a result of this realignment. Prior period amounts have been recast accordingly. In addition, with the acquisition of Ametros on January 24, 2024, the Company formed a new reportable segment called Healthcare Financial Services, which includes the aggregated financial information of the HSA Bank and Ametros businesses. The allocation of the purchase price for the Ametros acquisition is considered preliminary at March 31, 2024. The $228.2 million of preliminary goodwill recorded related to Ametros has been allocated entirely to Healthcare Financial Services. The allocation of the purchase price for the interLINK acquisition on January 11, 2023, was considered final as of June 30, 2023. The $143.2 million of goodwill recorded related to interLINK was allocated entirely to Commercial Banking. The following is a description of the Company’s three reportable segments and their primary services at March 31, 2024: Commercial Banking serves businesses with more than $10 million of revenue through its Commercial Real Estate, Equipment Finance, Middle Market, Regional Banking, Asset-Based Lending, Commercial Services, Public Sector Finance, Sponsor and Specialty Finance, Verticals and Support, Private Banking, and Treasury Management business units. Healthcare Financial Services offers consumer-directed healthcare solutions that includes HSAs, health reimbursement arrangements, the administration of medical insurance claim settlements, flexible spending accounts, and commuter benefits. Accounts are distributed nationwide directly to employers and individual consumers, as well as through national and regional insurance carriers, benefit consultants, and financial advisors. Consumer Banking offers consumer deposit and fee-based services, residential mortgages, home equity lines, secured and unsecured loans, debit and credit card products, and investment services to individual consumers and small businesses through its Consumer Lending and Business Banking business units. Consumer Banking operates a distribution network consisting of 196 banking centers and 347 ATMs, a customer care center, and a full range of web and mobile-based banking services, primarily throughout southern New England and the New York metro and suburban markets. 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 FTP 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. For additional information regarding the Company’s segment reporting methodology, please refer to Note 21: Segment Reporting in the Notes to Consolidated Financial Statements contained in Part II - Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The following tables present balance sheet information, including the appropriate allocations, for the Company’s reportable segments and the Corporate and Reconciling category: At March 31, 2024 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 1,960,363 $ 285,670 $ 622,035 $ — $ 2,868,068 Total assets 42,286,247 509,012 12,268,347 21,098,087 76,161,693 At December 31, 2023 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 1,951,945 $ 57,485 $ 622,035 $ — $ 2,631,465 Total assets 41,843,297 122,421 12,327,403 20,652,128 74,945,249 The following tables present operating results, including the appropriate allocations, for the Company’s reportable segments and the Corporate and Reconciling category: Three months ended March 31, 2024 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 341,942 $ 86,138 $ 205,777 $ (66,118) $ 567,739 Non-interest income 34,280 31,061 33,978 34 99,353 Non-interest expense 106,225 52,127 120,121 57,450 335,923 Pre-tax, pre-provision net revenue 269,997 65,072 119,634 (123,534) 331,169 Provision (benefit) for credit losses 47,283 — (4,089) 2,306 45,500 Income before income taxes 222,714 65,072 123,723 (125,840) 285,669 Income tax expense 49,220 17,114 30,436 (27,424) 69,346 Net income $ 173,494 $ 47,958 $ 93,287 $ (98,416) $ 216,323 Three months ended March 31, 2023 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 360,293 $ 71,730 $ 234,604 $ (71,344) $ 595,283 Non-interest income 33,720 24,067 27,636 (14,657) 70,766 Non-interest expense 98,833 43,700 116,555 73,379 332,467 Pre-tax, pre-provision net revenue 295,180 52,097 145,685 (159,380) 333,582 Provision for credit losses 35,250 — 2,571 8,928 46,749 Income before income taxes 259,930 52,097 143,114 (168,308) 286,833 Income tax expense 57,964 14,066 35,922 (42,123) 65,829 Net income $ 201,966 $ 38,031 $ 107,192 $ (126,185) $ 221,004

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	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 14: Segment Reporting. Three months ended March 31, 2024 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 5,842 $ 22,052 $ 14,796 $ (101) $ 42,589 Loan and lease related fees (1) 3,622 — — — 3,622 Wealth and investment services 3,178 — 4,751 (5) 7,924 Other income — 9,009 (183) 1,044 9,870 Revenue from contracts with customers 12,642 31,061 19,364 938 64,005 Other sources of non-interest income 21,638 — 14,614 (904) 35,348 Total non-interest income $ 34,280 $ 31,061 $ 33,978 $ 34 $ 99,353 Three months ended March 31, 2023 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 4,236 $ 22,092 $ 19,178 $ (70) $ 45,436 Loan and lease related fees (1) 4,427 — — — 4,427 Wealth and investment services 2,767 — 3,828 (8) 6,587 Other income — 1,975 358 932 3,265 Revenue from contracts with customers 11,430 24,067 23,364 854 59,715 Other sources of non-interest income 22,290 — 4,272 (15,511) 11,051 Total non-interest income $ 33,720 $ 24,067 $ 27,636 $ (14,657) $ 70,766 (1) A portion of Loan and lease related fees on the Condensed Consolidated Statements of Income comprises income generated from factored receivables and payroll financing activities that is within the scope of ASC Topic 606. 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 transfers, 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. 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 cardholder’s 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. Contracts with customers generated accounts receivable and deferred revenue of $2.3 million and $20.8 million, respectively,

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
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: (In thousands) At March 31, At December 31, 2023 Commitments to extend credit $ 11,171,394 $ 12,026,597 Standby letters of credit 497,573 482,462 Commercial letters of credit 36,300 54,382 Total credit-related financial instruments with off-balance sheet risk $ 11,705,267 $ 12,563,441 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. Allowance for Credit Losses on Unfunded Loan Commitments An ACL is recorded under the CECL methodology and included in Accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets to provide for the unused portion of commitments to lend that are not unconditionally cancellable by the Company. At March 31, 2024, and December 31, 2023, the ACL on unfunded loan commitments totaled $24.5 million and $24.7 million, respectively. 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. Federal Deposit Insurance Corporation Special Assessment On November 29, 2023, the FDIC published a final rule implementing a special assessment for certain banks to recover losses incurred by protecting uninsured depositors of Silicon Valley Bank and Signature Bank upon their failure in March 2023. The final rule levies a special assessment to certain banks at a quarterly rate of 3.36 basis points based on their uninsured deposits balance reported as of December 31, 2022. The special assessment is to be collected for an anticipated total of eight quarterly assessment periods beginning with the first quarter of 2024, which has a payment date of June 28, 2024. Based on the final rule, the Company had estimated that its special assessment charge was approximately $47.2 million at December 31, 2023. On February 23, 2024, the Company received notification from the FDIC that the estimated loss attributable to the protection of uninsured depositors at Silicon Valley Bank and Signature Bank was $20.4 billion, an increase of approximately $4.1 billion from the estimated $16.3 billion described in the final rule. Based on the Company’s evaluation of all information available at March 31, 2024, the Company recorded an additional $11.9 million towards its estimated special assessment charge. The FDIC plans to provide institutions subject to the special assessment with an updated estimate of each institution’s quarterly and total special assessment expense with its first quarter 2024 special assessment invoice, to be released in June 2024.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated subsequent events from the date of the Condensed Consolidated Financial Statements, and accompanying Notes thereto, through the date of issuance, and determined that no significant events were identified requiring recognition or disclosure.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income	$ 216,323	$ 221,004

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X. Certain information and footnote disclosures required by GAAP for complete financial statements have been omitted or condensed. Therefore, the Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations for the three months ended March 31, 2024, are not necessarily indicative of the future results that may be attained for the entire year or other interim periods. In the opinion of management, all necessary adjustments have been reflected to present fairly the financial position, results of operations, and cash flows for the reporting periods presented. 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 in the Condensed Consolidated Financial Statements. Certain prior period amounts have been reclassified to conform to the current period presentation. These reclassifications did not have a material impact on the Company’s Condensed Consolidated Financial Statements.
Use of Estimates	Use of Estimates The preparation of the Condensed 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 Condensed Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Relevant Accounting Standards Issued But Not Yet Adopted	Accounting Standards Adopted in the Current Period ASU No. 2023-02—Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method (a consensus of the Emerging Issue Task Force) In March 2023, the FASB issued ASU No. 2023-02—Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method (a consensus of the Emerging Issues Task Force), which permits reporting entities to elect to account for their tax equity investments, regardless of the program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. A reporting entity may make an accounting policy election to apply the proportional amortization method in accordance with paragraph 323-740-25-4 on a tax-credit-program by tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. A reporting entity that applies the proportional amortization method to qualifying tax equity investments must account for the receipt of the investment tax credits using the flow-through method under Topic 740, Income Taxes, even if the entity applies the deferral method for other investment tax credits received. The amendments also remove certain guidance for Qualified Affordable Housing Project Investments, require the application of the delayed equity contribution guidance to all tax equity investments, and require specific disclosures that must be applied to all investments that generate income tax credits and other income tax benefits from a tax credit program for which the entity has elected to apply the proportional amortization method in accordance with Subtopic 323-740. The Company adopted the Update on January 1, 2024. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements and disclosures as its investments in tax credit structures are currently limited to LIHTC investments, which are already being accounted for using the proportional amortization method. ASU No. 2023-01—Leases (Topic 842): Common Control Arrangements In March 2023, the FASB issued ASU No. 2023-01—Leases (Topic 842): Common Control Arrangements, which requires that leasehold improvements associated with leases between entities under common control be: (i) amortized by the lessee over the useful lives of the leasehold improvements to the common control group (regardless of the lease term) as long as the lessee controls the use of the underlying asset (the leased asset) through a lease; however, if the lessor obtained the right to control the use of the underlying asset through a lease with another entity not within the same common control group, the amortization period may not exceed the amortization period of the common control group; and (ii) accounted for as a transfer between entities under common control through an adjustment to equity, if, and when, the lessee no longer controls the use of the underlying asset. Additionally, those leasehold improvements are subject to the impairment guidance in Topic 360, Property, Plant, and Equipment. The Company adopted the Update on January 1, 2024. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements and disclosures as its operating lease arrangements in which it is lessee are currently not between entities under common control. ASU No. 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restriction 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 requires 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). The Company adopted the Update on January 1, 2024. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements and disclosures. The Company does not currently consider contractual restrictions on the sale of an equity security in measuring fair value. Relevant Accounting Standards Issued But Not Yet Adopted ASU No. 2023-09—Income Taxes (Topic 740)—Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09—Income Taxes (Topic 740)—Improvements to Income Tax Disclosures, to provide more transparency about income tax information through improvements to income tax disclosures, primarily related to the rate reconciliation and income taxes paid information. Specifically, the amendments in this Update require disclosure of: (i) a tabular reconciliation, using both percentages and reporting currency amounts, with prescribed categories that are required to be disclosed, and the separate disclosure and disaggregation of prescribed reconciling items with an effect equal to 5% or more of the amount determined by multiplying pretax income from continuing operations by the application statutory rate; (ii) a qualitative description of the states and local jurisdictions that make up the majority (greater than 50%) of the effect of the state and local income taxes; and (iii) amount of income taxes paid, net of refunds received, disaggregated by federal, state, and foreign taxes and by individual jurisdictions that comprise 5% or more of total income taxes paid, net of refunds received. The amendments in this Update also include certain other amendments to improve the effectiveness of income tax disclosures. The Update is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The amendments should be applied on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating this guidance to determine the impact on its income tax disclosures. ASU No. 2023-07—Segment Reporting (Topic 280)—Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU No. 2023-07—Segment Reporting (Topic 280)—Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. Specifically, the amendments in this Update require disclosure of: (i) significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss; (ii) an amount for other segment items by reportable segment and a description of its composition; and (iii) the title and position of the chief operating decision maker and an explanation of how the chief operating decision maker uses each reported measure of segment profit or loss in assessing segment performance and deciding how to allocate resources. In addition, all annual disclosures about a reportable segment’s profit or loss and assets currently required by Topic 280, will be required in interim periods. Overall, the Update does not change how a public entity identifies its operating segments, aggregates those operating segments, or determines its reportable segments, or applies the quantitative thresholds to determine its reportable segments. The Update is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements, in which, upon transition, the segment expense categories and amounts disclosed in the prior periods should be based on the significant segment expense categories identified and disclosed in the period of adoption. The Company is currently evaluating this guidance to determine the impact on its segment reporting disclosures.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2024
Business Combination and Asset Acquisition [Abstract]
Summary of Purchase Price Allocation	The acquisition was accounted for as a business combination. Accordingly, the total purchase price, which included cash paid of $359.7 million, the forgiveness of $12.9 million in long-term debt, and the assumption of a $5.8 million liability for the Seller’s transaction expenses, has been preliminarily allocated to the identifiable assets acquired and liabilities assumed based on their acquisition-date fair values, as summarized in the following table: (In thousands) Fair Value Purchase price consideration $ 378,424 Assets: Cash and due from banks 310 Premises and equipment 1,078 Other intangible assets 188,900 Deferred tax assets, net (35,889) Other assets: Funds held in escrow 288,167 Accounts receivable 2,435 Prepaid expenses 1,166 Total other assets 291,768 Total assets acquired $ 446,167 Liabilities: Interest-bearing deposits (1) (20,622) Other liabilities: Accounts payable 684 Accrued expenses 4,270 Deferred revenue 20,391 Member’s funds 288,167 Operating lease liabilities 838 Total other liabilities 314,350 Total liabilities assumed $ 293,728 Net assets acquired 152,439 Pre-existing equity interest (2) $ 2,200 Goodwill $ 228,185 (1) The $20.6 million reflects the amount held in Ametros’ operating cash account at the Bank on January 24, 2024. Upon acquisition, such cash and the Bank’s corresponding deposit liability owed to Ametros were eliminated in consolidation, which resulted in a decrease to interest-bearing deposits for the Bank and the Bank’s legal title to the funds being held in such operating cash account. (2) Prior to the acquisition date, the Company had a 0.6% equity interest in Ametros. The consideration transferred reflects the purchase price for the remaining 99.4% of the business. Upon acquisition, the Company recognized a $1.5 million gain in Other income on the accompanying Condensed Consolidated Statement of Income, which represents the difference between the cost basis and estimated acquisition-date fair value of the Company’s pre-existing equity interest in Ametros.
Summary of Supplemental Pro Forma Information Adjustments

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale	The following tables summarize the amortized cost and fair value of available-for-sale securities by major type: At March 31, 2024 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Government agency debentures $ 302,261 $ — $ (39,773) $ 262,488 Municipal bonds and notes 1,257,643 23 (50,316) 1,207,350 Agency CMO 50,422 — (4,186) 46,236 Agency MBS 3,629,162 19,414 (284,162) 3,364,414 Agency CMBS 2,619,079 12,555 (310,404) 2,321,230 CMBS 752,086 32 (20,267) 731,851 Corporate debt 693,093 142 (76,026) 617,209 Private label MBS 46,044 — (4,736) 41,308 Other 9,836 — (781) 9,055 Total available-for-sale $ 9,359,626 $ 32,166 $ (790,651) $ 8,601,141 At December 31, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Government agency debentures $ 302,212 $ — $ (37,579) $ 264,633 Municipal bonds and notes 1,626,126 8 (52,901) 1,573,233 Agency CMO 52,994 — (4,053) 48,941 Agency MBS 3,568,140 32,461 (253,503) 3,347,098 Agency CMBS 2,569,438 18,204 (299,571) 2,288,071 CMBS 788,478 — (24,729) 763,749 Corporate debt 704,569 — (82,414) 622,155 Private label MBS 46,635 — (3,827) 42,808 Other 9,830 — (789) 9,041 Total available-for-sale $ 9,668,422 $ 50,673 $ (759,366) $ 8,959,729 (1) Accrued interest receivable on available-for-sale securities of $43.6 million and $42.5 million at March 31, 2024, and December 31, 2023, respectively, is excluded from amortized cost and is included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. The following table summarizes the carrying value of available-for-sale securities pledged for deposits, borrowings, and other purposes: (In thousands) At March 31, 2024 At December 31, 2023 Pledged for deposits $ 2,418,726 $ 2,102,115 Pledged for borrowings and other 5,687,136 6,111,430 Total available-for-sale securities pledged $ 8,105,862 $ 8,213,545
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	The following tables summarize the gross unrealized losses and fair value of available-for-sale securities by length of time each major security type has been in a continuous unrealized loss position: At March 31, 2024 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized Government agency debentures $ — $ — $ 262,488 $ (39,773) 19 $ 262,488 $ (39,773) Municipal bonds and notes 16,078 (179) 1,180,389 (50,137) 346 1,196,467 (50,316) Agency CMO — — 46,236 (4,186) 36 46,236 (4,186) Agency MBS 187,534 (892) 1,930,864 (283,270) 462 2,118,398 (284,162) Agency CMBS 424,108 (16,031) 1,356,358 (294,373) 148 1,780,466 (310,404) CMBS 34,913 (87) 674,009 (20,180) 40 708,922 (20,267) Corporate debt — — 612,760 (76,026) 89 612,760 (76,026) Private label MBS — — 41,308 (4,736) 3 41,308 (4,736) Other — — 9,055 (781) 2 9,055 (781) Total $ 662,633 $ (17,189) $ 6,113,467 $ (773,462) 1,145 $ 6,776,100 $ (790,651) At December 31, 2023 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized Government agency debentures $ — $ — $ 264,633 $ (37,579) 19 $ 264,633 $ (37,579) Municipal bonds and notes 18,066 (124) 1,536,656 (52,777) 386 1,554,722 (52,901) Agency CMO — — 48,941 (4,053) 36 48,941 (4,053) Agency MBS 71,187 (272) 1,945,221 (253,231) 457 2,016,408 (253,503) Agency CMBS 430,070 (16,137) 1,314,681 (283,434) 145 1,744,751 (299,571) CMBS 43,844 (856) 719,905 (23,873) 42 763,749 (24,729) Corporate debt 4,278 (27) 617,877 (82,387) 91 622,155 (82,414) Private label MBS — — 42,808 (3,827) 3 42,808 (3,827) Other — — 9,041 (789) 2 9,041 (789) Total $ 567,445 $ (17,416) $ 6,499,763 $ (741,950) 1,181 $ 7,067,208 $ (759,366)
Summary of Debt Securities by Contractual Maturity	The following table summarizes the amortized cost and fair value of available-for-sale securities by contractual maturity: At March 31, 2024 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 32,356 $ 31,621 After 1 year through 5 years 597,123 565,463 After 5 through 10 years 1,271,850 1,173,728 After 10 years 7,458,297 6,830,329 Total available-for-sale $ 9,359,626 $ 8,601,141 The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity: At March 31, 2024 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 29,846 $ 29,771 After 1 year through 5 years 94,598 89,326 After 5 through 10 years 299,712 288,067 After 10 years 7,255,919 6,375,703 Total held-to-maturity $ 7,680,075 $ 6,782,867
Debt Securities, Held-to-maturity	The following tables summarize the amortized cost, fair value, and ACL on held-to-maturity securities by major type: At March 31, 2024 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 22,489 $ — $ (1,938) $ 20,551 $ — $ 22,489 Agency MBS 2,618,783 1,429 (327,351) 2,292,861 — 2,618,783 Agency CMBS 4,028,799 11,580 (540,641) 3,499,738 — 4,028,799 Municipal bonds and notes 910,422 683 (34,953) 876,152 184 910,238 CMBS 99,582 — (6,017) 93,565 — 99,582 Total held-to-maturity $ 7,680,075 $ 13,692 $ (910,900) $ 6,782,867 $ 184 $ 7,679,891 At December 31, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 23,470 $ — $ (1,728) $ 21,742 $ — $ 23,470 Agency MBS 2,409,521 1,141 (284,776) 2,125,886 — 2,409,521 Agency CMBS 3,625,627 18,586 (514,534) 3,129,679 — 3,625,627 Municipal bonds and notes 916,104 2,440 (24,877) 893,667 209 915,895 CMBS 100,075 — (6,426) 93,649 — 100,075 Total held-to-maturity $ 7,074,797 $ 22,167 $ (832,341) $ 6,264,623 $ 209 $ 7,074,588 The following table summarizes the activity in the ACL on held-to-maturity securities: Three months ended March 31, (In thousands) 2024 2023 Balance, beginning of period $ 209 $ 182 (Benefit) provision for credit losses (25) 100 Balance, end of period $ 184 $ 282 The following tables summarize the amortized cost of held-to-maturity securities based on their lowest publicly available credit rating: March 31, 2024 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A3 Not Rated Agency CMO $ — $ 22,489 $ — $ — $ — $ — $ — Agency MBS — 2,618,783 — — — — — Agency CMBS — 4,028,799 — — — — — Municipal bonds and notes 332,969 162,439 252,852 111,277 32,690 4,165 14,030 CMBS 99,582 — — — — — — Total held-to-maturity $ 432,551 $ 6,832,510 $ 252,852 $ 111,277 $ 32,690 $ 4,165 $ 14,030 December 31, 2023 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A3 Not Rated Agency CMO $ — $ 23,470 $ — $ — $ — $ — $ — Agency MBS — 2,409,521 — — — — — Agency CMBS — 3,625,627 — — — — — Municipal bonds and notes 333,479 162,615 253,671 115,404 32,732 4,165 14,038 CMBS 100,075 — — — — — — Total held-to-maturity $ 433,554 $ 6,221,233 $ 253,671 $ 115,404 $ 32,732 $ 4,165 $ 14,038 The following table summarizes the carrying value of held-to-maturity securities pledged for deposits, borrowings, and other purposes: (In thousands) At March 31, 2024 At December 31, 2023 Pledged for deposits $ 1,557,987 $ 1,212,824 Pledged for borrowings and other 5,732,569 5,582,379 Total held-to-maturity securities pledged $ 7,290,556 $ 6,795,203

Loans and Leases (Tables)

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 2024
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table summarizes loans and leases by portfolio segment and class: (In thousands) At March 31, At December 31, 2023 Commercial non-mortgage $ 16,696,070 $ 16,885,475 Asset-based 1,492,886 1,557,841 Commercial real estate 13,972,916 13,569,762 Multi-family 7,896,586 7,587,970 Equipment financing 1,280,058 1,328,786 Commercial portfolio 41,338,516 40,929,834 Residential 8,226,154 8,227,923 Home equity 1,479,420 1,516,955 Other consumer 54,552 51,340 Consumer portfolio 9,760,126 9,796,218 Loans and leases $ 51,098,642 $ 50,726,052 At March 31, 2024 (In thousands) Current 30-59 Days 60-89 Days 90+ Days Non-Accrual Total Commercial non-mortgage $ 77,451 $ — $ 19 $ — $ 97,587 $ 175,057 Asset-based 42,331 — — — — 42,331 Commercial real estate 24,859 — — — 169 25,028 Multi-family — 18,103 22,406 — 9,481 49,990 Equipment financing 1,762 — — — 317 2,079 Residential 1,258 — — — 764 2,022 Home equity 510 — — — 86 596 Total $ 148,171 $ 18,103 $ 22,425 $ — $ 108,404 $ 297,103 At March 31, 2023 (In thousands) Current 30-59 Days 60-89 Days 90+ Days Non-Accrual Total Commercial non-mortgage $ 3,562 $ — $ — $ — $ 26,329 $ 29,891 Commercial real estate 17,116 — — — — 17,116 Home equity 23 — — — 98 121 Total $ 20,701 $ — $ — $ — $ 26,427 $ 47,128
Past Due Financing Receivables	The following tables summarize the aging of accrual and non-accrual loans and leases by class: At March 31, 2024 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Current Total Loans Commercial non-mortgage $ 3,077 $ 3,138 $ 35 $ 193,294 $ 199,544 $ 16,496,526 $ 16,696,070 Asset-based — — — 34,893 34,893 1,457,993 1,492,886 Commercial real estate 28,137 717 12,452 3,815 45,121 13,927,795 13,972,916 Multi-family 21,750 22,406 — 10,439 54,595 7,841,991 7,896,586 Equipment financing 6,189 2,984 — 8,677 17,850 1,262,208 1,280,058 Commercial portfolio 59,153 29,245 12,487 251,118 352,003 40,986,513 41,338,516 Residential 9,645 8,019 — 8,589 26,253 8,199,901 8,226,154 Home equity 4,971 1,652 — 22,934 29,557 1,449,863 1,479,420 Other consumer 100 141 — 200 441 54,111 54,552 Consumer portfolio 14,716 9,812 — 31,723 56,251 9,703,875 9,760,126 Total $ 73,869 $ 39,057 $ 12,487 $ 282,841 $ 408,254 $ 50,690,388 $ 51,098,642 At December 31, 2023 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Current Total Loans Commercial non-mortgage $ 2,270 $ 890 $ 94 $ 122,855 $ 126,109 $ 16,759,366 $ 16,885,475 Asset-based — — — 35,068 35,068 1,522,773 1,557,841 Commercial real estate 1,459 — 184 11,383 13,026 13,556,736 13,569,762 Multi-family 5,198 2,340 — — 7,538 7,580,432 7,587,970 Equipment financing 3,966 8 — 9,828 13,802 1,314,984 1,328,786 Commercial portfolio 12,893 3,238 278 179,134 195,543 40,734,291 40,929,834 Residential 14,894 6,218 — 5,704 26,816 8,201,107 8,227,923 Home equity 5,676 3,285 — 23,545 32,506 1,484,449 1,516,955 Other consumer 410 94 — 142 646 50,694 51,340 Consumer portfolio 20,980 9,597 — 29,391 59,968 9,736,250 9,796,218 Total $ 33,873 $ 12,835 $ 278 $ 208,525 $ 255,511 $ 50,470,541 $ 50,726,052
Financing Receivable, Nonaccrual	The following table provides additional information on non-accrual loans and leases: At March 31, 2024 At December 31, 2023 (In thousands) Non-accrual Non-accrual with No Allowance Non-accrual Non-accrual with No Allowance Commercial non-mortgage $ 193,294 $ 12,367 $ 122,855 $ 20,066 Asset-based 34,893 1,155 35,068 1,330 Commercial real estate 3,815 — 11,383 2,681 Multi-family 10,439 957 — — Equipment financing 8,677 376 9,828 1,584 Commercial portfolio 251,118 14,855 179,134 25,661 Residential 8,589 1,690 5,704 856 Home equity 22,934 11,546 23,545 12,471 Other consumer 200 38 142 49 Consumer portfolio 31,723 13,274 29,391 13,376 Total $ 282,841 $ 28,129 $ 208,525 $ 39,037
Activity In Allowance For Losses	The following table summarizes the change in the ACL on loans and leases by portfolio segment: At or for the three months ended March 31, 2024 2023 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 577,663 $ 58,074 $ 635,737 $ 533,125 $ 61,616 $ 594,741 Adoption of ASU No. 2022-02 — — — 7,704 (1,831) 5,873 Provision (benefit) 49,354 (6,160) 43,194 38,757 (936) 37,821 Charge-offs (38,461) (1,330) (39,791) (26,410) (1,098) (27,508) Recoveries 553 1,749 2,302 1,574 1,413 2,987 Balance, end of period $ 589,109 $ 52,333 $ 641,442 $ 554,750 $ 59,164 $ 613,914 Individually evaluated for credit losses 60,786 4,209 64,995 27,459 8,590 36,049 Collectively evaluated for credit losses $ 528,323 $ 48,124 $ 576,447 $ 527,291 $ 50,574 $ 577,865
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 March 31, 2024 (In thousands) 2024 2023 2022 2021 2020 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Risk rating: Pass $ 663,424 $ 2,467,862 $ 3,900,425 $ 1,315,230 $ 686,594 $ 1,480,383 $ 5,511,758 $ 16,025,676 Special mention — 54,770 56,426 47,247 32,684 11,246 34,044 236,417 Substandard — 77,736 127,796 41,141 26,857 48,295 112,126 433,951 Doubtful — — — — — 26 — 26 Total commercial non-mortgage 663,424 2,600,368 4,084,647 1,403,618 746,135 1,539,950 5,657,928 16,696,070 Current period gross write-offs — 240 21,228 9,118 353 766 — 31,705 Asset-based: Risk rating: Pass 7,552 20,276 — — — 28,179 1,264,087 1,320,094 Special mention — 927 732 — — 3,497 16,527 21,683 Substandard — — — — — 1,152 149,957 151,109 Total asset-based 7,552 21,203 732 — — 32,828 1,430,571 1,492,886 Current period gross write-offs — — — — — — — — Commercial real estate: Risk rating: Pass 575,902 2,319,662 3,557,239 1,748,708 1,138,226 4,032,725 151,615 13,524,077 Special mention — 19,635 4,675 20,978 29,561 116,552 — 191,401 Substandard — 29,149 22,571 6,546 59,648 138,314 1,210 257,438 Total commercial real estate 575,902 2,368,446 3,584,485 1,776,232 1,227,435 4,287,591 152,825 13,972,916 Current period gross write-offs — — — 1,399 — 860 — 2,259 Multi-family: Risk rating: Pass 393,731 1,638,357 1,921,264 1,057,961 384,683 2,447,598 — 7,843,594 Special mention — — — — — 1,685 — 1,685 Substandard — — — — 359 50,948 — 51,307 Total multi-family 393,731 1,638,357 1,921,264 1,057,961 385,042 2,500,231 — 7,896,586 Current period gross write-offs — — — — — 1,128 — 1,128 Equipment financing: Risk rating: Pass 71,632 301,206 272,532 198,821 162,267 209,068 — 1,215,526 Special mention 52 16,448 3,207 5,938 229 8,368 — 34,242 Substandard 84 171 8,676 7,292 6,008 8,059 — 30,290 Total equipment financing 71,768 317,825 284,415 212,051 168,504 225,495 — 1,280,058 Current period gross write-offs — — — — — 3,369 — 3,369 Total commercial portfolio 1,712,377 6,946,199 9,875,543 4,449,862 2,527,116 8,586,095 7,241,324 41,338,516 Current period gross write-offs $ — $ 240 $ 21,228 $ 10,517 $ 353 $ 6,123 $ — $ 38,461 At December 31, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 2,602,444 $ 4,089,327 $ 1,371,139 $ 711,362 $ 610,199 $ 952,097 $ 5,970,588 $ 16,307,156 Special mention 15,184 60,240 61,235 33,111 — 720 48,561 219,051 Substandard 48,849 104,087 23,258 28,222 44,612 30,426 79,778 359,232 Doubtful — 8 — — 3 25 — 36 Total commercial non-mortgage 2,666,477 4,253,662 1,455,632 772,695 654,814 983,268 6,098,927 16,885,475 Current period gross write-offs 325 7,637 1,775 512 969 4,391 — 15,609 Asset-based: Pass 23,007 — — — 3,280 34,999 1,333,271 1,394,557 Special mention 651 763 — — 3,676 — 29,610 34,700 Substandard — — — — 1,330 — 127,254 128,584 Total asset-based 23,658 763 — — 8,286 34,999 1,490,135 1,557,841 Current period gross write-offs — — — — 13,189 3,900 — 17,089 Commercial real estate: Pass 2,265,428 3,502,425 1,831,005 1,195,732 1,193,642 3,112,770 176,668 13,277,670 Special mention 850 4,675 14,463 31,405 23,443 37,688 1,210 113,734 Substandard 25,802 16,179 9,545 15,418 58,602 52,812 — 178,358 Total commercial real estate 2,292,080 3,523,279 1,855,013 1,242,555 1,275,687 3,203,270 177,878 13,569,762 Current period gross write-offs 4,632 — 12,617 3,813 2,754 38,569 — 62,385 Multi-family: Pass 1,597,599 1,934,100 1,041,416 442,888 595,676 1,920,618 — 7,532,297 Special mention — — — — 260 35,942 — 36,202 Substandard — — — 364 11,563 7,544 — 19,471 Total multi-family 1,597,599 1,934,100 1,041,416 443,252 607,499 1,964,104 — 7,587,970 Current period gross write-offs — — — — — 3,447 — 3,447 Equipment financing: Pass 335,874 297,186 232,304 176,061 183,679 69,927 — 1,295,031 Special mention — — 116 — 90 — — 206 Substandard — 9,144 8,064 6,600 4,285 5,456 — 33,549 Total equipment financing 335,874 306,330 240,484 182,661 188,054 75,383 — 1,328,786 Current period gross write-offs — — — 2,633 3,304 42 — 5,979 Total commercial portfolio 6,915,688 10,018,134 4,592,545 2,641,163 2,734,340 6,261,024 7,766,940 40,929,834 Current period gross write-offs $ 4,957 $ 7,637 $ 14,392 $ 6,958 $ 20,216 $ 50,349 $ — $ 104,509 The following tables summarize the amortized cost basis of consumer loans by FICO score and origination year: At March 31, 2024 (In thousands) 2024 2023 2022 2021 2020 Prior Revolving Loans Amortized Cost Basis Total Residential: Risk rating: 800+ $ 31,773 $ 258,518 $ 876,330 $ 1,085,654 $ 425,046 $ 1,029,578 $ — $ 3,706,899 740-799 63,609 336,781 660,935 748,992 300,885 713,330 — 2,824,532 670-739 16,063 139,978 334,526 284,846 88,711 518,781 — 1,382,905 580-669 887 18,590 49,910 43,025 17,029 106,517 — 235,958 579 and below — 1,391 10,072 12,128 782 51,487 — 75,860 Total residential 112,332 755,258 1,931,773 2,174,645 832,453 2,419,693 — 8,226,154 Current period gross write-offs — — — — — 64 — 64 Home equity: Risk rating: 800+ 1,319 28,064 26,971 34,581 25,209 61,331 381,942 559,417 740-799 1,373 23,922 19,804 26,051 12,507 37,911 333,256 454,824 670-739 3,970 14,475 14,413 15,265 7,083 30,424 241,202 326,832 580-669 354 3,097 3,783 2,555 1,237 13,881 73,203 98,110 579 and below — 198 1,514 733 232 4,172 33,388 40,237 Total home equity 7,016 69,756 66,485 79,185 46,268 147,719 1,062,991 1,479,420 Current period gross write-offs — — — — — 177 — 177 Other consumer: Risk rating: 800+ 56 482 373 1,875 142 462 30,934 34,324 740-799 9 975 536 465 596 833 6,149 9,563 670-739 392 618 435 324 720 781 4,520 7,790 580-669 146 122 176 92 118 250 1,134 2,038 579 and below — 77 97 49 14 31 569 837 Total other consumer 603 2,274 1,617 2,805 1,590 2,357 43,306 54,552 Current period gross write-offs 890 — 11 18 26 144 — 1,089 Total consumer portfolio 119,951 827,288 1,999,875 2,256,635 880,311 2,569,769 1,106,297 9,760,126 Current period gross write-offs $ 890 $ — $ 11 $ 18 $ 26 $ 385 $ — $ 1,330 At December 31, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Residential: Risk rating: 800+ $ 214,446 $ 847,009 $ 1,096,109 $ 451,307 $ 141,919 $ 910,117 $ — $ 3,660,907 740-799 363,696 703,568 755,750 279,946 112,303 633,578 — 2,848,841 670-739 137,460 293,699 292,255 95,838 48,412 346,663 — 1,214,327 580-669 20,208 52,962 45,770 14,840 10,492 106,497 — 250,769 579 and below 6,909 52,690 11,749 1,345 128,714 51,672 — 253,079 Total residential 742,719 1,949,928 2,201,633 843,276 441,840 2,048,527 — 8,227,923 Current period gross write-offs — — 387 — 153 4,630 — 5,170 Home equity: Risk rating: 800+ 27,047 27,439 35,927 25,586 8,110 56,062 391,616 571,787 740-799 24,772 20,069 27,147 13,888 5,158 34,190 355,926 481,150 670-739 15,857 15,655 15,389 5,992 3,189 29,454 242,189 327,725 580-669 3,080 3,786 1,991 1,658 1,115 9,988 70,102 91,720 579 and below 696 1,109 1,079 576 552 6,319 34,242 44,573 Total home equity 71,452 68,058 81,533 47,700 18,124 136,013 1,094,075 1,516,955 Current period gross write-offs — 4 81 — 104 3,114 — 3,303 Other consumer: Risk rating: 800+ 432 356 1,913 189 255 77 25,699 28,921 740-799 1,318 586 486 730 690 381 7,180 11,371 670-739 526 570 358 981 1,210 79 3,549 7,273 580-669 69 169 129 153 303 56 1,983 2,862 579 and below 125 97 61 11 28 1 590 913 Total other consumer 2,470 1,778 2,947 2,064 2,486 594 39,001 51,340 Current period gross write-offs 3,263 7 2 218 377 363 — 4,230 Total consumer portfolio 816,641 2,019,764 2,286,113 893,040 462,450 2,185,134 1,133,076 9,796,218 Current period gross write-offs $ 3,263 $ 11 $ 470 $ 218 $ 634 $ 8,107 $ — $ 12,703
Troubled Debt Restructurings on Financing Receivables	The following tables summarize the amortized cost basis at March 31, 2024, and 2023, of loans modified to borrowers experiencing financial difficulty, disaggregated by class and type of concession granted: For the three months ended March 31, 2024 (In thousands) Interest Rate Reduction Term Extension Payment Delay Combination - Term Extension and Interest Rate Reduction Total % of Total Class (2) Commercial non-mortgage $ 1,934 $ 18,124 $ 50,038 $ 1,099 $ 71,195 0.4 % Asset-based — 1,667 — — 1,667 0.1 Commercial real estate — 7,753 — — 7,753 0.1 Multi-family — 49,990 — — 49,990 0.6 Equipment financing — 556 — — 556 — Residential 629 — — 135 764 — Home equity — — — 65 65 — Total (1) $ 2,563 $ 78,090 $ 50,038 $ 1,299 $ 131,990 0.3 % For the three months ended March 31, 2023 (In thousands) Interest Rate Reduction Term Extension Combination - Total % of Total Class (2) Commercial non-mortgage $ 7 $ 29,884 $ — $ 29,891 0.2 % Commercial real estate — 17,116 — 17,116 0.1 Home equity — 57 64 121 — Total (1) $ 7 $ 47,057 $ 64 $ 47,128 0.1 % (1) The total amortized cost excludes accrued interest receivable of $0.8 million and $0.2 million at March 31, 2024, and 2023, respectively. (2) Represents the total amortized cost of the loans modified as a percentage of the total period end loan balance by class. The following tables describe the financial effect of the modifications made to borrowers experiencing financial difficulty: For the three months ended March 31, 2024 Financial Effect (1) Interest Rate Reduction: Commercial non-mortgage Reduced weighted average interest rate by 2.5% Term Extension: Commercial non-mortgage Extended term by a weighted average of 0.5 years Asset-based Extended term by a weighted average of 0.3 years Commercial real estate Extended term by a weighted average of 0.3 years Multi-family Extended term by a weighted average of 0.7 years Payment Delay: Commercial non-mortgage Provided payment deferrals for a weighted average of 0.5 years For the three months ended March 31, 2023 Financial Effect Interest Rate Reduction: Commercial non-mortgage Reduced weighted average interest rate by 4.5% Term Extension: Commercial non-mortgage Extended term by a weighted average of 0.6 years Commercial real estate Extended term by a weighted average of 1.0 year Home equity Extended term by a weighted average of 8.8 years Combination - Term Extension and Interest Rate Reduction: Home equity Extended term by a weighted average of 5.1 years and reduced weighted average interest rate by 1.5% (1) Certain disclosures related to financial effects of modifications do not include those deemed to be immaterial.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table summarizes changes in the carrying amount of goodwill: (In thousands) At March 31, At December 31, Balance, beginning of period $ 2,631,465 $ 2,514,104 Ametros acquisition (1) 236,603 — interLINK acquisition — 143,216 Bend acquisition — (294) Sterling merger — (25,561) Balance, end of period $ 2,868,068 $ 2,631,465 (1) Reflects the $228.2 million of preliminary goodwill recorded in connection with the Ametros acquisition in January 2024, and $8.4 million of other adjustments.
Schedule of Finite-Lived Intangible Assets	The following table summarizes other intangible assets: At March 31, 2024 At December 31, 2023 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposits (1) $ 328,837 $ 59,239 $ 269,598 $ 146,037 $ 53,986 $ 92,051 Customer relationships 151,000 46,654 104,346 151,000 43,116 107,884 Non-competition agreement 4,000 1,000 3,000 4,000 800 3,200 Trade name (1) 6,100 203 5,897 — — — Total other intangible assets $ 489,937 $ 107,096 $ 382,841 $ 301,037 $ 97,902 $ 203,135 (1) The increase in the gross carrying amount is due to the Ametros acquisition in January 2024, which resulted in the identification and recognition of a $182.8 million core deposit intangible asset and a $6.1 million trade name.
Schedule Of Future Amortization expense	The remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) At March 31, 2024 (1) Remainder of 2024 $ 25,480 2025 31,094 2026 30,113 2027 29,558 2028 26,687 Thereafter 190,258 (1) As previously discussed in Note 2: Business Developments, the Company initiated a plan to actively sell its payroll finance and factored receivables loan portfolio, along with the related customer relationship intangible assets, in March 2024. The aggregate net carrying amount of the related customer relationship intangible assets was $49.7 million at March 31, 2024, and has been excluded from the Company’s estimate of remaining future amortization expense.

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2024
Deposit Liabilities [Abstract]
Deposit Liabilities, Type	The following table summarizes deposits by type: (In thousands) At March 31, At December 31, Non-interest-bearing: Demand $ 10,212,509 $ 10,732,516 Interest-bearing: Health savings accounts 8,603,184 8,287,889 Checking 9,498,036 8,994,095 Money market 18,615,031 17,662,826 Savings 6,881,663 6,642,499 Time deposits 6,937,320 8,464,459 Total interest-bearing $ 50,535,234 $ 50,051,768 Total deposits $ 60,747,743 $ 60,784,284 Time deposits, money market, and interest-bearing checking obtained through brokers (1) $ 1,778,381 $ 3,673,733 Aggregate amount of time deposit accounts that exceeded the FDIC limit 1,348,498 1,221,887 Demand deposit overdrafts reclassified as loan balances 12,251 10,432 (1) Excludes $5.8 billion and $5.7 billion of money market sweep deposits received through interLINK at March 31, 2024, and December 31, 2023, respectively.
Time Deposit Maturities	The following table summarizes the scheduled maturities of time deposits: (In thousands) At March 31, Remainder of 2024 $ 6,406,380 2025 414,440 2026 56,451 2027 33,809 2028 20,873 Thereafter 5,367 Total time deposits $ 6,937,320

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The following table summarizes securities sold under agreements to repurchase and other borrowings: At March 31, 2024 At December 31, 2023 (Dollars in thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) $ 126,886 0.12 % $ 358,387 3.43 % Federal funds purchased 235,000 5.44 100,000 5.48 Securities sold under agreements to repurchase and other borrowings $ 361,886 3.58 % $ 458,387 3.88 % (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.
Federal Home Loan Bank, Advances	The following table summarizes information for FHLB advances: At March 31, 2024 At December 31, 2023 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 3,650,000 5.50 % $ 2,350,000 5.53 % After 1 but within 2 years — — — — After 2 but within 3 years — — — — After 3 but within 4 years 456 1.36 235 — After 4 but within 5 years — — 228 2.75 After 5 years 9,474 2.08 9,555 2.07 Total FHLB advances $ 3,659,930 5.49 % $ 2,360,018 5.52 % Aggregate market value of assets pledged as collateral $ 20,238,325 $ 20,734,035 Remaining borrowing capacity at FHLB 10,779,412 12,535,423
Schedule of Long-term Debt Instruments	The following table summarizes long-term debt: (Dollars in thousands) At March 31, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 $ — $ 132,550 4.100% Senior fixed-rate notes due March 25, 2029 (2) 326,766 328,104 4.000% Subordinated fixed-to-floating rate notes due December 30, 2029 274,000 274,000 3.875% Subordinated fixed-to-floating rate notes due November 1, 2030 225,000 225,000 Junior subordinated debt Webster Statutory Trust I floating-rate notes due September 17, 2033 (3) 77,320 77,320 Total senior and subordinated debt 903,086 1,036,974 Discount on senior fixed-rate notes (498) (537) Debt issuance cost on senior fixed-rate notes (1,337) (1,419) Premium on subordinated fixed-to-floating rate notes 13,269 13,802 Long-term debt (1) $ 914,520 $ 1,048,820 (1) The classification of debt as long-term is based on the initial terms of greater than one year as of the date of issuance. (2) The Company de-designated its fair value hedging relationship on these senior fixed-rate notes in 2020. A basis adjustment of $26.8 million and $28.1 million at March 31, 2024, and December 31, 2023, respectively, is included in the carrying value and is being amortized over the remaining life of the senior fixed-rate notes. (3)

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income, Net of Tax (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss by Component	The following tables summarize the changes in each component of accumulated other comprehensive (loss), net of tax: Three months ended March 31, 2024 (In thousands) Investment Securities Available-for-Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (517,450) $ (2,869) $ (30,252) $ (550,571) Other comprehensive (loss) income before reclassifications (45,392) (30,291) 251 (75,432) Amounts reclassified from accumulated other comprehensive (loss) 9,121 302 479 9,902 Other comprehensive (loss) income, net of tax (36,271) (29,989) 730 (65,530) Balance, end of period $ (553,721) $ (32,858) $ (29,522) $ (616,101) Three months ended March 31, 2023 (In thousands) Investment Securities Available-for-Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (631,160) $ (8,874) $ (44,926) $ (684,960) Other comprehensive income before reclassifications 56,635 20,782 3,553 80,970 Amounts reclassified from accumulated other comprehensive (loss) 14,983 592 395 15,970 Other comprehensive income, net of tax 71,618 21,374 3,948 96,940 Balance, end of period $ (559,542) $ 12,500 $ (40,978) $ (588,020)
Schedule of Accumulated Other Comprehensive Loss	The following table further summarizes the amounts reclassified from accumulated other comprehensive (loss): Accumulated Other Comprehensive Three months ended Associated Line Item on the March 31, 2024 2023 (In thousands) Investment securities available-for-sale: Net unrealized holding (losses) $ (12,396) $ (20,483) (Loss) on sale of investment securities, net (1) Tax benefit 3,275 5,500 Income tax expense Net of tax $ (9,121) $ (14,983) Derivative instruments: Hedge terminations $ (34) $ (76) Interest expense Premium amortization (272) (736) Interest income Tax benefit 4 220 Income tax expense Net of tax $ (302) $ (592) Defined benefit pension and other postretirement benefit plans: Actuarial net loss amortization $ (657) $ (542) Other expense Tax benefit 178 147 Income tax expense Net of tax $ (479) $ (395) (1)

Regulatory Capital and Restri_2

Regulatory Capital and Restrictions (Tables)	3 Months Ended
	Mar. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Information On The Capital Ratios	The following tables provides information on the capital ratios for the Holding Company and the Bank: At March 31, 2024 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 Risk-Based Capital $ 5,923,041 10.57 % $ 2,521,412 4.5 % $ 3,642,040 6.5 % Tier 1 Risk-Based Capital 6,207,020 11.08 3,361,883 6.0 4,482,510 8.0 Total Risk-Based Capital 7,400,017 13.21 4,482,510 8.0 5,603,138 10.0 Tier 1 Leverage Capital 6,207,020 8.51 2,916,558 4.0 3,645,697 5.0 Webster Bank CET1 Risk-Based Capital $ 6,588,389 11.78 % $ 2,516,948 4.5 % $ 3,635,591 6.5 % Tier 1 Risk-Based Capital 6,588,389 11.78 3,355,930 6.0 4,474,574 8.0 Total Risk-Based Capital 7,191,796 12.86 4,474,574 8.0 5,593,217 10.0 Tier 1 Leverage Capital 6,588,389 9.04 2,913,783 4.0 3,642,229 5.0 At December 31, 2023 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 Risk-Based Capital $ 6,188,433 11.11 % $ 2,507,190 4.5 % $ 3,621,497 6.5 % Tier 1 Risk-Based Capital 6,472,412 11.62 3,342,920 6.0 4,457,227 8.0 Total Risk-Based Capital 7,643,423 13.72 4,457,227 8.0 5,571,534 10.0 Tier 1 Leverage Capital 6,472,412 9.06 2,857,890 4.0 3,572,362 5.0 Webster Bank CET1 Risk-Based Capital $ 6,913,443 12.43 % $ 2,502,835 4.5 % $ 3,615,206 6.5 % Tier 1 Risk-Based Capital 6,913,443 12.43 3,337,113 6.0 4,449,484 8.0 Total Risk-Based Capital 7,494,332 13.47 4,449,484 8.0 5,561,855 10.0 Tier 1 Leverage Capital 6,913,443 9.69 2,855,212 4.0 3,569,015 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. During the three-year transition period, regulatory capital ratios will phase out the aggregate amount of the regulatory capital benefit provided from the delayed CECL adoption in the initial two years. For 2022, 2023, and 2024, the Company is allowed 75%, 50%, and 25%, respectively, of the regulatory capital benefit as of December 31, 2021, with full absorption occurring in 2025.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of LIHTC Investments and Commitments	The following table summarizes the Company’s LIHTC investments and related unfunded commitments: (In thousands) March 31, 2024 December 31, 2023 Gross investment in LIHTC investments $ 1,293,847 $ 1,135,192 Accumulated amortization (161,612) (141,199) Net investment in LIHTC investments $ 1,132,235 $ 993,993 Unfunded commitments for LIHTC investments $ 683,133 $ 549,258
Schedule of Components of Income Tax Expense (Benefit)	The following table summarizes the amount of income tax credits and other income tax benefits, and investment amortization generated from the Company’s LIHTC investments, which are recognized as a component of income tax expense (benefit): Three months ended March 31, (In thousands) 2024 2023 Income tax credits and other income tax benefits from LIHTC investments $ (28,024) $ (21,898) Investment amortization from LIHTC investments 20,413 21,478

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share Basic And Diluted	The following table summarizes the calculation of basic and diluted earnings per common share: Three months ended March 31, (In thousands, except per share data) 2024 2023 Net income $ 216,323 $ 221,004 Less: Preferred stock dividends 4,163 4,163 Net income available to common stockholders 212,160 216,841 Less: Earnings allocated to participating securities 2,101 1,845 Earnings applicable to common stockholders $ 210,059 $ 214,996 Weighted-average common shares outstanding - basic 170,445 172,766 Add: Effect of dilutive stock options and restricted stock 259 117 Weighted-average common shares outstanding - diluted 170,704 172,883 Basic earnings per common share $ 1.23 $ 1.24 Diluted earnings per common share 1.23 1.24

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following tables present the notional amounts and fair values, including accrued interest, of derivative positions: At March 31, 2024 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 500,000 $ 263 $ 4,750,000 $ 44,366 Not designated as hedging instruments: Interest rate derivatives (1) 8,542,883 362,602 8,542,895 362,802 Mortgage banking derivatives (2) 1,463 15 — — Other (3) 364,396 662 744,777 225 Total not designated as hedging instruments 8,908,742 363,279 9,287,672 363,027 Gross derivative instruments, before netting $ 9,408,742 363,542 $ 14,037,672 407,393 Less: Master netting agreements 61,395 61,395 Cash collateral received/paid 285,297 — Total derivative instruments, after netting $ 16,850 $ 345,998 At December 31, 2023 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 2,750,000 $ 11,140 $ 2,700,000 $ 13,679 Not designated as hedging instruments: Interest rate derivatives (1) 8,284,356 319,122 8,272,197 321,064 Mortgage banking derivatives (2) 2,798 37 — — Other (3) 340,553 337 731,055 1,067 Total not designated as hedging instruments 8,627,707 319,496 9,003,252 322,131 Gross derivative instruments, before netting $ 11,377,707 330,636 $ 11,703,252 335,810 Less: Master netting agreements 55,949 55,949 Cash collateral received/paid 232,190 — Total derivative instruments, after netting $ 42,497 $ 279,861 (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. Notional amounts of interest rate swaps cleared through clearing houses included $91.0 million and $113.8 million for asset derivatives at March 31, 2024, and December 31, 2023, respectively. The related fair values approximated zero. There were no interest rate swaps cleared through clearing houses for liability derivatives at both March 31, 2024, and December 31, 2023. (2) Notional amounts related to residential loans excluded approved floating rate commitments of $1.7 million and $1.0 million at March 31, 2024, and December 31, 2023, respectively. (3) Other derivatives include foreign currency forward contracts related to lending arrangements, a Visa equity swap transaction, and risk participation agreements. Notional amounts of risk participation agreements included $300.5 million and $299.2 million for asset derivatives and $707.6 million and $682.9 million for liability derivatives at March 31, 2024, and December 31, 2023, respectively, which had insignificant related fair values.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following tables represent the off-setting derivative financial instruments that are subject to matter netting agreements: At March 31, 2024 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Paid Net Amount Presented Asset derivatives $ 346,853 $ 61,395 $ 285,297 $ 161 Liability derivatives 61,395 61,395 — — At December 31, 2023 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Paid Net Amount Presented Asset derivatives $ 289,778 $ 55,949 $ 232,190 $ 1,639 Liability derivatives 55,949 55,949 — —
Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location	The following table summarizes the income statement effect of derivatives designated as hedging instruments: Recognized In Three months ended March 31, (In thousands) Net Interest Income 2024 2023 Fair value hedges: Interest rate derivatives Deposits interest expense $ (1,320) $ (10,235) Hedged item Deposits interest expense — 10,427 Net recognized on fair value hedges (1) $ 1,320 $ (192) Cash flow hedges: Interest rate derivatives Long-term debt interest expense $ 34 $ 76 Interest rate derivatives Interest and fees on loans and leases (10,764) (736) Net recognized on cash flow hedges $ (10,798) $ (812)
Other Derivatives Not Designated For Hedge Accounting	The following table summarizes the income statement effect of derivatives not designated as hedging instruments: Recognized In Three months ended March 31, (In thousands) Non-interest Income 2024 2023 Interest rate derivatives Other income $ 1,290 $ (3,687) Mortgage banking derivatives Mortgage banking activities (22) (16) Other Other income 1,277 (735) Total not designated as hedging instruments $ 2,545 $ (4,438)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Option, Disclosures	The following table compares the fair value to the UPB of originated loans held for sale: At March 31, 2024 At December 31, 2023 (In thousands) Fair Value UPB Difference Fair Value UPB Difference Originated loans held for sale $ 323 $ 316 $ 7 $ 2,610 $ 2,658 $ (48)
Fair Value Measurement Inputs and Valuation Techniques	The following tables summarize the unobservable inputs used to derive the estimated fair value of the Company’s contingent consideration liabilities (dollars in thousands): At March 31, 2024 Agreement Maximum Amount Probability of Achievement Payment Term Discount Rate Fair Value (i) Re-sign broker dealers (1) $ 207 99.0 % 1.63 6.40 % $ 182 (ii) Deposit program growth $ 12,500 100.0 % 0.75 6.40 % $ 11,568 At December 31, 2023 Agreement Maximum Amount Probability of Achievement Payment Term Discount Rate Fair Value (i) Re-sign broker dealers (1) $ 4,826 99.0 % 1.88 6.40 % $ 4,232 (ii) Deposit program growth $ 12,500 100.0 % 1.00 6.40 % $ 11,568 (1) The Company re-signed one of the existing broker dealers under contract in January 2024, which resulted in the cash payment of $4.6 million during the three months ended March 31, 2024, to settle a portion of its contingent consideration obligation with StoneCastle Partners LLC in accordance with the purchase agreement.
Fair Value Of Assets And Liabilities Measured On Recurring Basis	The following tables summarize the fair values of assets and liabilities measured at fair value on a recurring basis: At March 31, 2024 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: Government agency debentures $ — $ 262,488 $ — $ 262,488 Municipal bonds and notes — 1,207,350 — 1,207,350 Agency CMO — 46,236 — 46,236 Agency MBS — 3,364,414 — 3,364,414 Agency CMBS — 2,321,230 — 2,321,230 CMBS — 731,851 — 731,851 Corporate debt — 617,209 — 617,209 Private label MBS — 41,308 — 41,308 Other — 9,055 — 9,055 Total available-for-sale securities — 8,601,141 — 8,601,141 Gross derivative instruments, before netting (1) 594 362,948 — 363,542 Originated loans held for sale — 323 — 323 Investments held in Rabbi Trusts 12,545 — — 12,545 Alternative investments 1,221 — — 1,221 Alternative investments measured at NAV (2) — — — 38,620 Total financial assets $ 14,360 $ 8,964,412 $ — $ 9,017,392 Financial Liabilities: Gross derivative instruments, before netting (1) $ 160 $ 407,233 $ — $ 407,393 Contingent consideration — — 11,750 11,750 Total financial liabilities $ 160 $ 407,233 $ 11,750 $ 419,143 At December 31, 2023 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: Government agency debentures $ — $ 264,633 $ — $ 264,633 Municipal bonds and notes — 1,573,233 — 1,573,233 Agency CMO — 48,941 — 48,941 Agency MBS — 3,347,098 — 3,347,098 Agency CMBS — 2,288,071 — 2,288,071 CMBS — 763,749 — 763,749 Corporate debt — 622,155 — 622,155 Private label MBS — 42,808 — 42,808 Other — 9,041 — 9,041 Total available-for-sale securities — 8,959,729 — 8,959,729 Gross derivative instruments, before netting (1) 217 330,419 — 330,636 Originated loans held for sale — 2,610 — 2,610 Investments held in Rabbi Trusts 11,900 — — 11,900 Alternative investments 959 — — 959 Alternative investments measured at NAV (2) — — — 35,888 Total financial assets $ 13,076 $ 9,292,758 $ — $ 9,341,722 Financial Liabilities: Gross derivative instruments, before netting (1) $ 970 $ 334,840 $ — $ 335,810 Contingent consideration — — 15,800 15,800 Total financial liabilities $ 970 $ 334,840 $ 15,800 $ 351,610 (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 within Note 12: 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 March 31, 2024 At December 31, 2023 (In thousands) Carrying Fair Carrying Fair Assets: Level 1 Cash and cash equivalents $ 1,545,228 $ 1,545,228 $ 1,715,795 $ 1,715,795 Level 2 Held-to-maturity investment securities, net 7,679,891 6,782,867 7,074,588 6,264,623 Level 3 Loans and leases, net 50,457,200 48,348,067 50,090,315 48,048,106 Mortgage servicing rights 1,514 3,973 8,523 24,495 Liabilities: Level 2 Deposit liabilities $ 53,810,423 $ 53,810,423 $ 52,319,825 $ 52,319,825 Time deposits 6,937,320 6,902,736 8,464,459 8,426,708 Securities sold under agreements to repurchase and other borrowings 361,886 361,867 458,387 458,380 FHLB advances 3,659,930 3,657,612 2,360,018 2,358,381 Long-term debt (1) 914,520 852,877 1,048,820 999,918 (1)

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Operating Results And Total Assets Reportable Segments	The following tables present balance sheet information, including the appropriate allocations, for the Company’s reportable segments and the Corporate and Reconciling category: At March 31, 2024 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 1,960,363 $ 285,670 $ 622,035 $ — $ 2,868,068 Total assets 42,286,247 509,012 12,268,347 21,098,087 76,161,693 At December 31, 2023 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 1,951,945 $ 57,485 $ 622,035 $ — $ 2,631,465 Total assets 41,843,297 122,421 12,327,403 20,652,128 74,945,249 The following tables present operating results, including the appropriate allocations, for the Company’s reportable segments and the Corporate and Reconciling category: Three months ended March 31, 2024 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 341,942 $ 86,138 $ 205,777 $ (66,118) $ 567,739 Non-interest income 34,280 31,061 33,978 34 99,353 Non-interest expense 106,225 52,127 120,121 57,450 335,923 Pre-tax, pre-provision net revenue 269,997 65,072 119,634 (123,534) 331,169 Provision (benefit) for credit losses 47,283 — (4,089) 2,306 45,500 Income before income taxes 222,714 65,072 123,723 (125,840) 285,669 Income tax expense 49,220 17,114 30,436 (27,424) 69,346 Net income $ 173,494 $ 47,958 $ 93,287 $ (98,416) $ 216,323 Three months ended March 31, 2023 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 360,293 $ 71,730 $ 234,604 $ (71,344) $ 595,283 Non-interest income 33,720 24,067 27,636 (14,657) 70,766 Non-interest expense 98,833 43,700 116,555 73,379 332,467 Pre-tax, pre-provision net revenue 295,180 52,097 145,685 (159,380) 333,582 Provision for credit losses 35,250 — 2,571 8,928 46,749 Income before income taxes 259,930 52,097 143,114 (168,308) 286,833 Income tax expense 57,964 14,066 35,922 (42,123) 65,829 Net income $ 201,966 $ 38,031 $ 107,192 $ (126,185) $ 221,004

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	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 14: Segment Reporting. Three months ended March 31, 2024 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 5,842 $ 22,052 $ 14,796 $ (101) $ 42,589 Loan and lease related fees (1) 3,622 — — — 3,622 Wealth and investment services 3,178 — 4,751 (5) 7,924 Other income — 9,009 (183) 1,044 9,870 Revenue from contracts with customers 12,642 31,061 19,364 938 64,005 Other sources of non-interest income 21,638 — 14,614 (904) 35,348 Total non-interest income $ 34,280 $ 31,061 $ 33,978 $ 34 $ 99,353 Three months ended March 31, 2023 (In thousands) Commercial Banking Healthcare Financial Services Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 4,236 $ 22,092 $ 19,178 $ (70) $ 45,436 Loan and lease related fees (1) 4,427 — — — 4,427 Wealth and investment services 2,767 — 3,828 (8) 6,587 Other income — 1,975 358 932 3,265 Revenue from contracts with customers 11,430 24,067 23,364 854 59,715 Other sources of non-interest income 22,290 — 4,272 (15,511) 11,051 Total non-interest income $ 33,720 $ 24,067 $ 27,636 $ (14,657) $ 70,766 (1) A portion of Loan and lease related fees on the Condensed Consolidated Statements of Income comprises income generated from factored receivables and payroll financing activities that is within the scope of ASC Topic 606.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Outstanding Financial Instruments Contract Amounts Represent Credit Risk	The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk: (In thousands) At March 31, At December 31, 2023 Commitments to extend credit $ 11,171,394 $ 12,026,597 Standby letters of credit 497,573 482,462 Commercial letters of credit 36,300 54,382 Total credit-related financial instruments with off-balance sheet risk $ 11,705,267 $ 12,563,441

Mergers and Acquisitions - Narr

Mergers and Acquisitions - Narrative (Details) $ in Thousands	Feb. 12, 2024 USD ($) loan	Jan. 24, 2024 USD ($)	Jan. 11, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2022
Business Acquisition [Line Items]
Depositary share, interest in a share of preferred stock							0.025
Goodwill				$ 2,868,068	$ 2,631,465	$ 2,514,104
Loans held for sale ($323 and $2,610 valued under fair value option)				239,763	$ 6,541
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mortgage Servicing Portfolio
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses	$ 18,400
Mortgage Loans, Derecognition Of Mortgage Servicing Rights	$ 6,700
Number Of Mortgage Loans | loan	9,184
Mortgage Loans, Unpaid Principal Balance	$ 1,400,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 11,700
Disposal Group, Held-for-Sale, Not Discontinued Operations | Commercial Services Business
Business Acquisition [Line Items]
Loans held for sale ($323 and $2,610 valued under fair value option)				49,700
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs, Related Assets And Liabilities To Be Sold				$ 220,200
interLINK
Business Acquisition [Line Items]
Equity interests acquired			100%
Goodwill			$ 143,200
Cash consideration			158,600
Business Combination, Consideration Transferred			174,600
Contingent consideration			16,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill			31,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Royalty Liabilities			15,900
interLINK | Broker Dealer Relationship
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			36,000
interLINK | Non Competition Agreement
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			4,000
interLINK | Developed Technology Rights
Business Acquisition [Line Items]
Intangible assets acquired			$ 6,000
Ametros
Business Acquisition [Line Items]
Equity interests acquired		99.40%
Goodwill		$ 228,185
Cash consideration		359,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		152,439
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue		20,391
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Members Funds		288,167
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Liabilities		838
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Expenses		$ 4,270

Mergers and Acquisitions - Summ

Mergers and Acquisitions - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 24, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Goodwill		$ 2,868,068	$ 2,631,465	$ 2,514,104
Ametros
Business Acquisition [Line Items]
Total consideration	$ 378,424
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	310
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Net	(35,889)
Premises and equipment	1,078
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	188,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	291,768
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	446,167
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Business Combination, Recognized Identifiable Liabilities Assumed, Interest Bearing Deposit Liabilities	(20,622)
Accrued expenses and other liabilities	314,350
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	293,728
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	152,439
Goodwill	228,185
Cash consideration	359,700
Debt Instrument, Decrease, Forgiveness	12,900
Business Combination, Separately Recognized Transactions, Liabilities Recognized	5,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Funds Held In Escrow	288,167
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	2,435
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,166
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	684
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Expenses	4,270
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	20,391
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Members Funds	288,167
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Liabilities	838
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Pre Existing Equity Interest	2,200
Business Combination, Amount Held In Operating Cash Account	$ 20,600
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	0.60%
Equity interests acquired	99.40%
Business Combination, Gain (Loss) In Other Income	$ 1,500

Investment Securities (Summary

Investment Securities (Summary Of Debt Securities Available-for-Sale) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) holding	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) holding
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	$ 9,359,626		$ 9,668,422
Unrealized Gains	32,166		50,673
Unrealized Losses	(790,651)		(759,366)
Investment securities available-for-sale, at fair value	8,601,141		8,959,729
Less than 12 months, fair value	662,633		567,445
Less than 12 months, unrealized losses	(17,189)		(17,416)
12 months or more, fair value	6,113,467		6,499,763
12 months or more, unrealized losses	$ (773,462)		$ (741,950)
Total, number of holdings | holding	1,145		1,181
Total, fair value	$ 6,776,100		$ 7,067,208
Total, unrealized losses	(790,651)		(759,366)
Amortized Cost
Maturing within 1 year	32,356
After 1 year through 5 years	597,123
After 5 through 10 years	1,271,850
After 10 years	7,458,297
Amortized Cost - Total available-for-sale debt securities	9,359,626		9,668,422
Fair Value
Maturing within 1 year	31,621
After 1 year through 5 years	565,463
After 5 through 10 years	1,173,728
After 10 years	6,830,329
Fair Value, Total available-for-sale debt securities	8,601,141		8,959,729
Available-for-sale securities pledged	8,105,862		8,213,545
Debt Securities, Available-for-sale, Realized Gain	2,240	$ 0
Debt Securities, Available-for-Sale, Realized Loss	(14,636)	$ (20,483)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	662,633		567,445
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	17,189		17,416
12 months or more, fair value	6,113,467		6,499,763
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 773,462		$ 741,950
Total, number of holdings | holding	1,145		1,181
Total, fair value	$ 6,776,100		$ 7,067,208
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	790,651		759,366
Government agency debentures
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	302,261		302,212
Unrealized Gains	0		0
Unrealized Losses	(39,773)		(37,579)
Investment securities available-for-sale, at fair value	262,488		264,633
12 months or more, fair value	262,488		264,633
12 months or more, unrealized losses	$ (39,773)		$ (37,579)
Total, number of holdings | holding	19		19
Total, fair value	$ 262,488		$ 264,633
Total, unrealized losses	(39,773)		(37,579)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	302,261		302,212
Fair Value
Fair Value, Total available-for-sale debt securities	262,488		264,633
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
12 months or more, fair value	262,488		264,633
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 39,773		$ 37,579
Total, number of holdings | holding	19		19
Total, fair value	$ 262,488		$ 264,633
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	39,773		37,579
Municipal bonds and notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	1,257,643		1,626,126
Unrealized Gains	23		8
Unrealized Losses	(50,316)		(52,901)
Investment securities available-for-sale, at fair value	1,207,350		1,573,233
Less than 12 months, fair value	16,078		18,066
Less than 12 months, unrealized losses	(179)		(124)
12 months or more, fair value	1,180,389		1,536,656
12 months or more, unrealized losses	$ (50,137)		$ (52,777)
Total, number of holdings | holding	346		386
Total, fair value	$ 1,196,467		$ 1,554,722
Total, unrealized losses	(50,316)		(52,901)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	1,257,643		1,626,126
Fair Value
Fair Value, Total available-for-sale debt securities	1,207,350		1,573,233
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	16,078		18,066
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	179		124
12 months or more, fair value	1,180,389		1,536,656
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 50,137		$ 52,777
Total, number of holdings | holding	346		386
Total, fair value	$ 1,196,467		$ 1,554,722
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	50,316		52,901
Agency CMO
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	50,422		52,994
Unrealized Gains	0		0
Unrealized Losses	(4,186)		(4,053)
Investment securities available-for-sale, at fair value	46,236		48,941
12 months or more, fair value	46,236		48,941
12 months or more, unrealized losses	$ (4,186)		$ (4,053)
Total, number of holdings | holding	36		36
Total, fair value	$ 46,236		$ 48,941
Total, unrealized losses	(4,186)		(4,053)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	50,422		52,994
Fair Value
Fair Value, Total available-for-sale debt securities	46,236		48,941
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
12 months or more, fair value	46,236		48,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 4,186		$ 4,053
Total, number of holdings | holding	36		36
Total, fair value	$ 46,236		$ 48,941
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4,186		4,053
Agency MBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	3,629,162		3,568,140
Unrealized Gains	19,414		32,461
Unrealized Losses	(284,162)		(253,503)
Investment securities available-for-sale, at fair value	3,364,414		3,347,098
Less than 12 months, fair value	187,534		71,187
Less than 12 months, unrealized losses	(892)		(272)
12 months or more, fair value	1,930,864		1,945,221
12 months or more, unrealized losses	$ (283,270)		$ (253,231)
Total, number of holdings | holding	462		457
Total, fair value	$ 2,118,398		$ 2,016,408
Total, unrealized losses	(284,162)		(253,503)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	3,629,162		3,568,140
Fair Value
Fair Value, Total available-for-sale debt securities	3,364,414		3,347,098
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	187,534		71,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	892		272
12 months or more, fair value	1,930,864		1,945,221
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 283,270		$ 253,231
Total, number of holdings | holding	462		457
Total, fair value	$ 2,118,398		$ 2,016,408
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	284,162		253,503
Agency CMBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	2,619,079		2,569,438
Unrealized Gains	12,555		18,204
Unrealized Losses	(310,404)		(299,571)
Investment securities available-for-sale, at fair value	2,321,230		2,288,071
Less than 12 months, fair value	424,108		430,070
Less than 12 months, unrealized losses	(16,031)		(16,137)
12 months or more, fair value	1,356,358		1,314,681
12 months or more, unrealized losses	$ (294,373)		$ (283,434)
Total, number of holdings | holding	148		145
Total, fair value	$ 1,780,466		$ 1,744,751
Total, unrealized losses	(310,404)		(299,571)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	2,619,079		2,569,438
Fair Value
Fair Value, Total available-for-sale debt securities	2,321,230		2,288,071
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	424,108		430,070
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16,031		16,137
12 months or more, fair value	1,356,358		1,314,681
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 294,373		$ 283,434
Total, number of holdings | holding	148		145
Total, fair value	$ 1,780,466		$ 1,744,751
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	310,404		299,571
CMBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	752,086		788,478
Unrealized Gains	32		0
Unrealized Losses	(20,267)		(24,729)
Investment securities available-for-sale, at fair value	731,851		763,749
Less than 12 months, fair value	34,913		43,844
Less than 12 months, unrealized losses	(87)		(856)
12 months or more, fair value	674,009		719,905
12 months or more, unrealized losses	$ (20,180)		$ (23,873)
Total, number of holdings | holding	40		42
Total, fair value	$ 708,922		$ 763,749
Total, unrealized losses	(20,267)		(24,729)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	752,086		788,478
Fair Value
Fair Value, Total available-for-sale debt securities	731,851		763,749
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	34,913		43,844
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	87		856
12 months or more, fair value	674,009		719,905
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 20,180		$ 23,873
Total, number of holdings | holding	40		42
Total, fair value	$ 708,922		$ 763,749
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	20,267		24,729
Corporate debt
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	693,093		704,569
Unrealized Gains	142		0
Unrealized Losses	(76,026)		(82,414)
Investment securities available-for-sale, at fair value	617,209		622,155
Less than 12 months, fair value	0		4,278
Less than 12 months, unrealized losses	0		(27)
12 months or more, fair value	612,760		617,877
12 months or more, unrealized losses	$ (76,026)		$ (82,387)
Total, number of holdings | holding	89		91
Total, fair value	$ 612,760		$ 622,155
Total, unrealized losses	(76,026)		(82,414)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	693,093		704,569
Fair Value
Fair Value, Total available-for-sale debt securities	617,209		622,155
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	0		4,278
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		27
12 months or more, fair value	612,760		617,877
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 76,026		$ 82,387
Total, number of holdings | holding	89		91
Total, fair value	$ 612,760		$ 622,155
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	76,026		82,414
Private label MBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	46,044		46,635
Unrealized Gains	0		0
Unrealized Losses	(4,736)		(3,827)
Investment securities available-for-sale, at fair value	41,308		42,808
Less than 12 months, fair value	0		0
Less than 12 months, unrealized losses	0		0
12 months or more, fair value	41,308		42,808
12 months or more, unrealized losses	$ (4,736)		$ (3,827)
Total, number of holdings | holding	3		3
Total, fair value	$ 41,308		$ 42,808
Total, unrealized losses	(4,736)		(3,827)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	46,044		46,635
Fair Value
Fair Value, Total available-for-sale debt securities	41,308		42,808
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0
12 months or more, fair value	41,308		42,808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 4,736		$ 3,827
Total, number of holdings | holding	3		3
Total, fair value	$ 41,308		$ 42,808
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4,736		3,827
Other
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	9,836		9,830
Unrealized Gains	0		0
Unrealized Losses	(781)		(789)
Investment securities available-for-sale, at fair value	9,055		9,041
12 months or more, fair value	9,055		9,041
12 months or more, unrealized losses	$ (781)		$ (789)
Total, number of holdings | holding	2		2
Total, fair value	$ 9,055		$ 9,041
Total, unrealized losses	(781)		(789)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	9,836		9,830
Fair Value
Fair Value, Total available-for-sale debt securities	9,055		9,041
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
12 months or more, fair value	9,055		9,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 781		$ 789
Total, number of holdings | holding	2		2
Total, fair value	$ 9,055		$ 9,041
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	781		789
Pledged For Borrowings
Fair Value
Available-for-sale securities pledged	5,687,136		6,111,430
Pledged For Municipal Deposits
Fair Value
Available-for-sale securities pledged	$ 2,418,726		$ 2,102,115

Investment Securities (Summar_2

Investment Securities (Summary of Held-to-Maturity Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 7,680,075	$ 7,074,797
Unrealized Gains	13,692	22,167
Unrealized Losses	(910,900)	(832,341)
Fair Value	6,782,867	6,264,623
Allowance	184	209	$ 282	$ 182
Net Carrying Value	7,679,891	7,074,588
Interest receivable	22,600	24,900
Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	432,551	433,554
Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	6,832,510	6,221,233
Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	252,852	253,671
Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	111,277	115,404
Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	32,690	32,732
Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	14,030	14,038
Agency CMO
Schedule of Investments [Line Items]
Amortized Cost	22,489	23,470
Unrealized Gains	0	0
Unrealized Losses	(1,938)	(1,728)
Fair Value	20,551	21,742
Allowance	0	0
Net Carrying Value	22,489	23,470
Agency CMO | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMO | Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	22,489	23,470
Agency CMO | Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMO | Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMO | Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMO | Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency MBS
Schedule of Investments [Line Items]
Amortized Cost	2,618,783	2,409,521
Unrealized Gains	1,429	1,141
Unrealized Losses	(327,351)	(284,776)
Fair Value	2,292,861	2,125,886
Allowance	0	0
Net Carrying Value	2,618,783	2,409,521
Agency MBS | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency MBS | Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	2,618,783	2,409,521
Agency MBS | Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency MBS | Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency MBS | Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency MBS | Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMBS
Schedule of Investments [Line Items]
Amortized Cost	4,028,799	3,625,627
Unrealized Gains	11,580	18,586
Unrealized Losses	(540,641)	(514,534)
Fair Value	3,499,738	3,129,679
Allowance	0	0
Net Carrying Value	4,028,799	3,625,627
Agency CMBS | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMBS | Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	4,028,799	3,625,627
Agency CMBS | Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMBS | Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMBS | Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
Agency CMBS | Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	0	0
Municipal bonds and notes
Schedule of Investments [Line Items]
Amortized Cost	910,422	916,104
Unrealized Gains	683	2,440
Unrealized Losses	(34,953)	(24,877)
Fair Value	876,152	893,667
Allowance	184	209
Net Carrying Value	910,238	915,895
Municipal bonds and notes | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	332,969	333,479
Municipal bonds and notes | Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	162,439	162,615
Municipal bonds and notes | Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	252,852	253,671
Municipal bonds and notes | Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	111,277	115,404
Municipal bonds and notes | Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	32,690	32,732
Municipal bonds and notes | Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	14,030	14,038
CMBS
Schedule of Investments [Line Items]
Amortized Cost	99,582	100,075
Unrealized Gains	0	0
Unrealized Losses	(6,017)	(6,426)
Fair Value	93,565	93,649
Allowance	0	0
Net Carrying Value	99,582	100,075
CMBS | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	99,582	100,075
CMBS | Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
CMBS | Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
CMBS | Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
CMBS | Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	0	0
CMBS | Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	$ 0	$ 0

Investment Securities (Sales of

Investment Securities (Sales of Available-for-Sale Debt Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available-for-sale securities	$ 331,690	$ 395,358

Investments Securities (Allowan

Investments Securities (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 209	$ 182
(Benefit) provision for credit losses	(25)	100
Balance, end of period	$ 184	$ 282

Investment Securities (Summar_3

Investment Securities (Summary Of Debt Securities Held-to Maturity - Contractual Maturities, Credit Quality and Other Information) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Maturing within 1 year	$ 29,846
After 1 year through 5 years	94,598
After 5 through 10 years	299,712
After 10 years	7,255,919
Amortized Cost	7,680,075	$ 7,074,797
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Maturing within 1 year	29,771
After 1 year through 5 years	89,326
After 5 through 10 years	288,067
After 10 years	6,375,703
Fair Value	6,782,867	6,264,623
Held-to-maturity securities pledged	7,290,556	6,795,203
Moody's, Aaa Rating
Amortized Cost
Amortized Cost	432,551	433,554
Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	6,832,510	6,221,233
Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	252,852	253,671
Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	111,277	115,404
Moody's, A1 Rating
Amortized Cost
Amortized Cost	32,690	32,732
Moody's, A3 Rating
Amortized Cost
Amortized Cost	4,165	4,165
Moody's, Not Rated
Amortized Cost
Amortized Cost	14,030	14,038
Pledged For Municipal Deposits
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held-to-maturity securities pledged	1,557,987	1,212,824
Pledged For Borrowings
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held-to-maturity securities pledged	5,732,569	5,582,379
Agency CMO
Amortized Cost
Amortized Cost	22,489	23,470
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	20,551	21,742
Agency CMO | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	0	0
Agency CMO | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	22,489	23,470
Agency CMO | Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMO | Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMO | Moody's, A1 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMO | Moody's, A3 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMO | Moody's, Not Rated
Amortized Cost
Amortized Cost	0	0
Agency MBS
Amortized Cost
Amortized Cost	2,618,783	2,409,521
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	2,292,861	2,125,886
Agency MBS | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	0	0
Agency MBS | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	2,618,783	2,409,521
Agency MBS | Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	0	0
Agency MBS | Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	0	0
Agency MBS | Moody's, A1 Rating
Amortized Cost
Amortized Cost	0	0
Agency MBS | Moody's, A3 Rating
Amortized Cost
Amortized Cost	0	0
Agency MBS | Moody's, Not Rated
Amortized Cost
Amortized Cost	0	0
Agency CMBS
Amortized Cost
Amortized Cost	4,028,799	3,625,627
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	3,499,738	3,129,679
Agency CMBS | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	0	0
Agency CMBS | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	4,028,799	3,625,627
Agency CMBS | Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMBS | Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMBS | Moody's, A1 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMBS | Moody's, A3 Rating
Amortized Cost
Amortized Cost	0	0
Agency CMBS | Moody's, Not Rated
Amortized Cost
Amortized Cost	0	0
Municipal bonds and notes
Amortized Cost
Amortized Cost	910,422	916,104
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	876,152	893,667
Municipal bonds and notes | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	332,969	333,479
Municipal bonds and notes | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	162,439	162,615
Municipal bonds and notes | Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	252,852	253,671
Municipal bonds and notes | Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	111,277	115,404
Municipal bonds and notes | Moody's, A1 Rating
Amortized Cost
Amortized Cost	32,690	32,732
Municipal bonds and notes | Moody's, A3 Rating
Amortized Cost
Amortized Cost	4,165	4,165
Municipal bonds and notes | Moody's, Not Rated
Amortized Cost
Amortized Cost	14,030	14,038
CMBS
Amortized Cost
Amortized Cost	99,582	100,075
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	93,565	93,649
CMBS | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	99,582	100,075
CMBS | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	0	0
CMBS | Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	0	0
CMBS | Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	0	0
CMBS | Moody's, A1 Rating
Amortized Cost
Amortized Cost	0	0
CMBS | Moody's, A3 Rating
Amortized Cost
Amortized Cost	0	0
CMBS | Moody's, Not Rated
Amortized Cost
Amortized Cost	$ 0	$ 0

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Interest receivable	$ 43,600,000		$ 42,500,000
Held-to-maturity debt securities	7,680,075,000		7,074,797,000
Held-to-maturity investment securities in non-accrual status	0		0
Investment securities available-for-sale, at fair value	8,601,141,000		$ 8,959,729,000
Equity Securities, FV-NI, Realized Loss	(12,400,000)	$ (20,500,000)
Total Loss Recognized, Portion Included In Provision For Credit Losses	2,600,000	3,800,000
Decrease in unrealized losses	31,300,000
Total Loss Recognized, Portion Not Included In Provision For Credit Losses	(9,800,000)	$ (16,700,000)
Callable
Schedule of Investments [Line Items]
Held-to-maturity debt securities	900,000,000
Investment securities available-for-sale, at fair value	$ 2,600,000,000

Loans and Leases (By Portfolio

Loans and Leases (By Portfolio and Class) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 51,098,642	$ 50,726,052
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	41,338,516	40,929,834
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	16,696,070	16,885,475
Commercial Portfolio Segment [Member] | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,492,886	1,557,841
Commercial Portfolio Segment [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,972,916	13,569,762
Commercial Portfolio Segment [Member] | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	7,896,586	7,587,970
Commercial Portfolio Segment [Member] | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,280,058	1,328,786
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	9,760,126	9,796,218
Consumer Portfolio Segment [Member] | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	8,226,154	8,227,923
Consumer Portfolio Segment [Member] | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,479,420	1,516,955
Consumer Portfolio Segment [Member] | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 54,552	$ 51,340

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized premiums	$ (29,500)		$ (33,800)
Interest receivable	284,100		270,400
Interest on non-accrual loans	10,800	$ 6,100
Loans held for sale ($323 and $2,610 valued under fair value option)	239,763		6,541
Accrued expenses and other liabilities	1,730,116		1,603,744
Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default	17,800
Disposal Group, Held-for-Sale, Not Discontinued Operations | Commercial Services Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs, Related Assets And Liabilities To Be Sold	220,200
Loans held for sale ($323 and $2,610 valued under fair value option)	49,700
Collateral Pledged | FHLB | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	17,800,000
Collateral Pledged | Federal Reserve Bank (FRB) | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,200,000
Collateral Pledged | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable	50,000		66,100
Collateral Pledged | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable	23,800		22,700
Collateral Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable	$ 78,100		$ 93,700

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 51,098,642	$ 50,726,052
90 or More Days Past Due and Accruing	12,487	278
Non-accrual	282,841	208,525
Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	408,254	255,511
30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	73,869	33,873
60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	39,057	12,835
Current
Financing Receivable, Past Due [Line Items]
Loans and leases	50,690,388	50,470,541
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	41,338,516	40,929,834
90 or More Days Past Due and Accruing	12,487	278
Non-accrual	251,118	179,134
Commercial Portfolio Segment [Member] | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	352,003	195,543
Commercial Portfolio Segment [Member] | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	59,153	12,893
Commercial Portfolio Segment [Member] | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	29,245	3,238
Commercial Portfolio Segment [Member] | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	40,986,513	40,734,291
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	16,696,070	16,885,475
90 or More Days Past Due and Accruing	35	94
Non-accrual	193,294	122,855
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	199,544	126,109
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,077	2,270
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,138	890
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	16,496,526	16,759,366
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Past Due [Line Items]
Loans and leases	1,492,886	1,557,841
90 or More Days Past Due and Accruing	0	0
Non-accrual	34,893	35,068
Commercial Portfolio Segment [Member] | Asset-based | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	34,893	35,068
Commercial Portfolio Segment [Member] | Asset-based | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial Portfolio Segment [Member] | Asset-based | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial Portfolio Segment [Member] | Asset-based | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,457,993	1,522,773
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	13,972,916	13,569,762
90 or More Days Past Due and Accruing	12,452	184
Non-accrual	3,815	11,383
Commercial Portfolio Segment [Member] | Commercial real estate | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	45,121	13,026
Commercial Portfolio Segment [Member] | Commercial real estate | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	28,137	1,459
Commercial Portfolio Segment [Member] | Commercial real estate | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	717	0
Commercial Portfolio Segment [Member] | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	13,927,795	13,556,736
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Past Due [Line Items]
Loans and leases	7,896,586	7,587,970
90 or More Days Past Due and Accruing	0	0
Non-accrual	10,439	0
Commercial Portfolio Segment [Member] | Multi-family | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	54,595	7,538
Commercial Portfolio Segment [Member] | Multi-family | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	21,750	5,198
Commercial Portfolio Segment [Member] | Multi-family | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	22,406	2,340
Commercial Portfolio Segment [Member] | Multi-family | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	7,841,991	7,580,432
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,280,058	1,328,786
90 or More Days Past Due and Accruing	0	0
Non-accrual	8,677	9,828
Commercial Portfolio Segment [Member] | Equipment financing | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	17,850	13,802
Commercial Portfolio Segment [Member] | Equipment financing | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	6,189	3,966
Commercial Portfolio Segment [Member] | Equipment financing | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	2,984	8
Commercial Portfolio Segment [Member] | Equipment financing | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,262,208	1,314,984
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	9,760,126	9,796,218
90 or More Days Past Due and Accruing	0	0
Non-accrual	31,723	29,391
Consumer Portfolio Segment [Member] | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	56,251	59,968
Consumer Portfolio Segment [Member] | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	14,716	20,980
Consumer Portfolio Segment [Member] | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	9,812	9,597
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	9,703,875	9,736,250
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Past Due [Line Items]
Loans and leases	8,226,154	8,227,923
90 or More Days Past Due and Accruing	0	0
Non-accrual	8,589	5,704
Consumer Portfolio Segment [Member] | Residential | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	26,253	26,816
Consumer Portfolio Segment [Member] | Residential | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	9,645	14,894
Consumer Portfolio Segment [Member] | Residential | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	8,019	6,218
Consumer Portfolio Segment [Member] | Residential | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	8,199,901	8,201,107
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	1,479,420	1,516,955
90 or More Days Past Due and Accruing	0	0
Non-accrual	22,934	23,545
Consumer Portfolio Segment [Member] | Home equity | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	29,557	32,506
Consumer Portfolio Segment [Member] | Home equity | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	4,971	5,676
Consumer Portfolio Segment [Member] | Home equity | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,652	3,285
Consumer Portfolio Segment [Member] | Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,449,863	1,484,449
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	54,552	51,340
90 or More Days Past Due and Accruing	0	0
Non-accrual	200	142
Consumer Portfolio Segment [Member] | Other consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	441	646
Consumer Portfolio Segment [Member] | Other consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	100	410
Consumer Portfolio Segment [Member] | Other consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	141	94
Consumer Portfolio Segment [Member] | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 54,111	$ 50,694

Loans and Leases (Nonaccrual) (

Loans and Leases (Nonaccrual) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	$ 282,841	$ 208,525
Non-accrual with No Allowance	28,129	39,037
Commercial Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	251,118	179,134
Non-accrual with No Allowance	14,855	25,661
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	193,294	122,855
Non-accrual with No Allowance	12,367	20,066
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	34,893	35,068
Non-accrual with No Allowance	1,155	1,330
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	3,815	11,383
Non-accrual with No Allowance	0	2,681
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	10,439	0
Non-accrual with No Allowance	957	0
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	8,677	9,828
Non-accrual with No Allowance	376	1,584
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	31,723	29,391
Non-accrual with No Allowance	13,274	13,376
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	8,589	5,704
Non-accrual with No Allowance	1,690	856
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	22,934	23,545
Non-accrual with No Allowance	11,546	12,471
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	200	142
Non-accrual with No Allowance	$ 38	$ 49

Loans and Leases (Activity In A

Loans and Leases (Activity In Allowance For Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision (benefit) for credit losses	$ 43,194	$ 37,821
Recoveries	2,302	2,987
Charge-offs	(39,791)	(27,508)
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period			$ 0	$ 5,873
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision (benefit) for credit losses	49,354	38,757
Recoveries	553	1,574
Charge-offs	(38,461)	(26,410)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period			0	7,704
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision (benefit) for credit losses	(6,160)	(936)
Recoveries	1,749	1,413
Charge-offs	$ (1,330)	$ (1,098)
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period			$ 0	$ (1,831)

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 635,737	$ 594,741	$ 594,741
Provision (benefit)	43,194	37,821
Charge-offs	(39,791)	(27,508)
Recoveries	2,302	2,987
Balance, end of period	641,442	613,914	635,737	$ 594,741
ALLL, Individually evaluated for impairment	64,995	36,049
ALLL, Collectively evaluated for impairment	576,447	577,865
Loans and leases	51,098,642		50,726,052
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, end of period			0	5,873
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	577,663	533,125	533,125
Provision (benefit)	49,354	38,757
Charge-offs	(38,461)	(26,410)
Recoveries	553	1,574
Balance, end of period	589,109	554,750	577,663	533,125
ALLL, Individually evaluated for impairment	60,786	27,459
ALLL, Collectively evaluated for impairment	528,323	527,291
Year one	1,712,377		6,915,688
Year two	6,946,199		10,018,134
Year three	9,875,543		4,592,545
Year four	4,449,862		2,641,163
Year five	2,527,116		2,734,340
Prior	8,586,095		6,261,024
Revolving Loans Amortized Cost Basis	7,241,324		7,766,940
Loans and leases	41,338,516		40,929,834
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0		4,957
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	240		7,637
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	21,228		14,392
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	10,517		6,958
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	353		20,216
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	6,123		50,349
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	38,461		104,509
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Year one	663,424		2,666,477
Year two	2,600,368		4,253,662
Year three	4,084,647		1,455,632
Year four	1,403,618		772,695
Year five	746,135		654,814
Prior	1,539,950		983,268
Revolving Loans Amortized Cost Basis	5,657,928		6,098,927
Loans and leases	16,696,070		16,885,475
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0		325
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	240		7,637
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	21,228		1,775
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	9,118		512
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	353		969
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	766		4,391
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	31,705		15,609
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, end of period			0	7,704
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	58,074	61,616	61,616
Provision (benefit)	(6,160)	(936)
Charge-offs	(1,330)	(1,098)
Recoveries	1,749	1,413
Balance, end of period	52,333	59,164	58,074	61,616
ALLL, Individually evaluated for impairment	4,209	8,590
ALLL, Collectively evaluated for impairment	48,124	$ 50,574
Year one	119,951		816,641
Year two	827,288		2,019,764
Year three	1,999,875		2,286,113
Year four	2,256,635		893,040
Year five	880,311		462,450
Prior	2,569,769		2,185,134
Revolving Loans Amortized Cost Basis	1,106,297		1,133,076
Loans and leases	9,760,126		9,796,218
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	890		3,263
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0		11
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	11		470
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	18		218
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	26		634
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	385		8,107
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	1,330		12,703
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Year one	112,332		742,719
Year two	755,258		1,949,928
Year three	1,931,773		2,201,633
Year four	2,174,645		843,276
Year five	832,453		441,840
Prior	2,419,693		2,048,527
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	8,226,154		8,227,923
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0		387
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0		153
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	64		4,630
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	64		5,170
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Year one	7,016		71,452
Year two	69,756		68,058
Year three	66,485		81,533
Year four	79,185		47,700
Year five	46,268		18,124
Prior	147,719		136,013
Revolving Loans Amortized Cost Basis	1,062,991		1,094,075
Loans and leases	1,479,420		1,516,955
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0		4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0		81
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0		104
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	177		3,114
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	177		3,303
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Year one	603		2,470
Year two	2,274		1,778
Year three	1,617		2,947
Year four	2,805		2,064
Year five	1,590		2,486
Prior	2,357		594
Revolving Loans Amortized Cost Basis	43,306		39,001
Loans and leases	54,552		51,340
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	890		3,263
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0		7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	11		2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	18		218
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	26		377
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	144		363
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	$ 1,089		4,230
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, end of period			$ 0	$ (1,831)

Loans and Leases (Credit Qualit

Loans and Leases (Credit Quality Indicators) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 51,098,642	$ 50,726,052
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,712,377	6,915,688
Year two	6,946,199	10,018,134
Year three	9,875,543	4,592,545
Year four	4,449,862	2,641,163
Year five	2,527,116	2,734,340
Prior	8,586,095	6,261,024
Revolving Loans Amortized Cost Basis	7,241,324	7,766,940
Loans and leases	41,338,516	40,929,834
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	38,461	104,509
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	6,123	50,349
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	353	20,216
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	10,517	6,958
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	21,228	14,392
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	240	7,637
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	4,957
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	663,424	2,666,477
Year two	2,600,368	4,253,662
Year three	4,084,647	1,455,632
Year four	1,403,618	772,695
Year five	746,135	654,814
Prior	1,539,950	983,268
Revolving Loans Amortized Cost Basis	5,657,928	6,098,927
Loans and leases	16,696,070	16,885,475
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	31,705	15,609
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	766	4,391
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	353	969
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	9,118	512
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	21,228	1,775
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	240	7,637
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	325
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7,552	23,658
Year two	21,203	763
Year three	732	0
Year four	0	0
Year five	0	8,286
Prior	32,828	34,999
Revolving Loans Amortized Cost Basis	1,430,571	1,490,135
Loans and leases	1,492,886	1,557,841
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	17,089
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	3,900
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	13,189
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	575,902	2,292,080
Year two	2,368,446	3,523,279
Year three	3,584,485	1,855,013
Year four	1,776,232	1,242,555
Year five	1,227,435	1,275,687
Prior	4,287,591	3,203,270
Revolving Loans Amortized Cost Basis	152,825	177,878
Loans and leases	13,972,916	13,569,762
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2,259	62,385
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	860	38,569
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	2,754
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	1,399	3,813
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	12,617
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	4,632
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	393,731	1,597,599
Year two	1,638,357	1,934,100
Year three	1,921,264	1,041,416
Year four	1,057,961	443,252
Year five	385,042	607,499
Prior	2,500,231	1,964,104
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	7,896,586	7,587,970
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	1,128	3,447
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	1,128	3,447
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	71,768	335,874
Year two	317,825	306,330
Year three	284,415	240,484
Year four	212,051	182,661
Year five	168,504	188,054
Prior	225,495	75,383
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,280,058	1,328,786
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	3,369	5,979
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	3,369	42
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	3,304
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	2,633
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Commercial Portfolio Segment [Member] | Pass | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	663,424	2,602,444
Year two	2,467,862	4,089,327
Year three	3,900,425	1,371,139
Year four	1,315,230	711,362
Year five	686,594	610,199
Prior	1,480,383	952,097
Revolving Loans Amortized Cost Basis	5,511,758	5,970,588
Loans and leases	16,025,676	16,307,156
Commercial Portfolio Segment [Member] | Pass | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7,552	23,007
Year two	20,276	0
Year three	0	0
Year four	0	0
Year five	0	3,280
Prior	28,179	34,999
Revolving Loans Amortized Cost Basis	1,264,087	1,333,271
Loans and leases	1,320,094	1,394,557
Commercial Portfolio Segment [Member] | Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	575,902	2,265,428
Year two	2,319,662	3,502,425
Year three	3,557,239	1,831,005
Year four	1,748,708	1,195,732
Year five	1,138,226	1,193,642
Prior	4,032,725	3,112,770
Revolving Loans Amortized Cost Basis	151,615	176,668
Loans and leases	13,524,077	13,277,670
Commercial Portfolio Segment [Member] | Pass | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	393,731	1,597,599
Year two	1,638,357	1,934,100
Year three	1,921,264	1,041,416
Year four	1,057,961	442,888
Year five	384,683	595,676
Prior	2,447,598	1,920,618
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	7,843,594	7,532,297
Commercial Portfolio Segment [Member] | Pass | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	71,632	335,874
Year two	301,206	297,186
Year three	272,532	232,304
Year four	198,821	176,061
Year five	162,267	183,679
Prior	209,068	69,927
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,215,526	1,295,031
Commercial Portfolio Segment [Member] | Special mention | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	15,184
Year two	54,770	60,240
Year three	56,426	61,235
Year four	47,247	33,111
Year five	32,684	0
Prior	11,246	720
Revolving Loans Amortized Cost Basis	34,044	48,561
Loans and leases	236,417	219,051
Commercial Portfolio Segment [Member] | Special mention | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	651
Year two	927	763
Year three	732	0
Year four	0	0
Year five	0	3,676
Prior	3,497	0
Revolving Loans Amortized Cost Basis	16,527	29,610
Loans and leases	21,683	34,700
Commercial Portfolio Segment [Member] | Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	850
Year two	19,635	4,675
Year three	4,675	14,463
Year four	20,978	31,405
Year five	29,561	23,443
Prior	116,552	37,688
Revolving Loans Amortized Cost Basis	0	1,210
Loans and leases	191,401	113,734
Commercial Portfolio Segment [Member] | Special mention | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	260
Prior	1,685	35,942
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,685	36,202
Commercial Portfolio Segment [Member] | Special mention | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	52	0
Year two	16,448	0
Year three	3,207	116
Year four	5,938	0
Year five	229	90
Prior	8,368	0
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	34,242	206
Commercial Portfolio Segment [Member] | Substandard | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	48,849
Year two	77,736	104,087
Year three	127,796	23,258
Year four	41,141	28,222
Year five	26,857	44,612
Prior	48,295	30,426
Revolving Loans Amortized Cost Basis	112,126	79,778
Loans and leases	433,951	359,232
Commercial Portfolio Segment [Member] | Substandard | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	1,330
Prior	1,152	0
Revolving Loans Amortized Cost Basis	149,957	127,254
Loans and leases	151,109	128,584
Commercial Portfolio Segment [Member] | Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	25,802
Year two	29,149	16,179
Year three	22,571	9,545
Year four	6,546	15,418
Year five	59,648	58,602
Prior	138,314	52,812
Revolving Loans Amortized Cost Basis	1,210	0
Loans and leases	257,438	178,358
Commercial Portfolio Segment [Member] | Substandard | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	364
Year five	359	11,563
Prior	50,948	7,544
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	51,307	19,471
Commercial Portfolio Segment [Member] | Substandard | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	84	0
Year two	171	9,144
Year three	8,676	8,064
Year four	7,292	6,600
Year five	6,008	4,285
Prior	8,059	5,456
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	30,290	33,549
Commercial Portfolio Segment [Member] | Doubtful | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	8
Year three	0	0
Year four	0	0
Year five	0	3
Prior	26	25
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	26	36
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	119,951	816,641
Year two	827,288	2,019,764
Year three	1,999,875	2,286,113
Year four	2,256,635	893,040
Year five	880,311	462,450
Prior	2,569,769	2,185,134
Revolving Loans Amortized Cost Basis	1,106,297	1,133,076
Loans and leases	9,760,126	9,796,218
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	1,330	12,703
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	385	8,107
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	26	634
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	18	218
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	11	470
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	11
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	890	3,263
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	112,332	742,719
Year two	755,258	1,949,928
Year three	1,931,773	2,201,633
Year four	2,174,645	843,276
Year five	832,453	441,840
Prior	2,419,693	2,048,527
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	8,226,154	8,227,923
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	64	5,170
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	64	4,630
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	153
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	387
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Consumer Portfolio Segment [Member] | Residential | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	31,773	214,446
Year two	258,518	847,009
Year three	876,330	1,096,109
Year four	1,085,654	451,307
Year five	425,046	141,919
Prior	1,029,578	910,117
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	3,706,899	3,660,907
Consumer Portfolio Segment [Member] | Residential | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	63,609	363,696
Year two	336,781	703,568
Year three	660,935	755,750
Year four	748,992	279,946
Year five	300,885	112,303
Prior	713,330	633,578
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	2,824,532	2,848,841
Consumer Portfolio Segment [Member] | Residential | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	16,063	137,460
Year two	139,978	293,699
Year three	334,526	292,255
Year four	284,846	95,838
Year five	88,711	48,412
Prior	518,781	346,663
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,382,905	1,214,327
Consumer Portfolio Segment [Member] | Residential | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	887	20,208
Year two	18,590	52,962
Year three	49,910	45,770
Year four	43,025	14,840
Year five	17,029	10,492
Prior	106,517	106,497
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	235,958	250,769
Consumer Portfolio Segment [Member] | Residential | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	6,909
Year two	1,391	52,690
Year three	10,072	11,749
Year four	12,128	1,345
Year five	782	128,714
Prior	51,487	51,672
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	75,860	253,079
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7,016	71,452
Year two	69,756	68,058
Year three	66,485	81,533
Year four	79,185	47,700
Year five	46,268	18,124
Prior	147,719	136,013
Revolving Loans Amortized Cost Basis	1,062,991	1,094,075
Loans and leases	1,479,420	1,516,955
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	177	3,303
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	177	3,114
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	104
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	81
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Consumer Portfolio Segment [Member] | Home equity | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,319	27,047
Year two	28,064	27,439
Year three	26,971	35,927
Year four	34,581	25,586
Year five	25,209	8,110
Prior	61,331	56,062
Revolving Loans Amortized Cost Basis	381,942	391,616
Loans and leases	559,417	571,787
Consumer Portfolio Segment [Member] | Home equity | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,373	24,772
Year two	23,922	20,069
Year three	19,804	27,147
Year four	26,051	13,888
Year five	12,507	5,158
Prior	37,911	34,190
Revolving Loans Amortized Cost Basis	333,256	355,926
Loans and leases	454,824	481,150
Consumer Portfolio Segment [Member] | Home equity | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3,970	15,857
Year two	14,475	15,655
Year three	14,413	15,389
Year four	15,265	5,992
Year five	7,083	3,189
Prior	30,424	29,454
Revolving Loans Amortized Cost Basis	241,202	242,189
Loans and leases	326,832	327,725
Consumer Portfolio Segment [Member] | Home equity | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	354	3,080
Year two	3,097	3,786
Year three	3,783	1,991
Year four	2,555	1,658
Year five	1,237	1,115
Prior	13,881	9,988
Revolving Loans Amortized Cost Basis	73,203	70,102
Loans and leases	98,110	91,720
Consumer Portfolio Segment [Member] | Home equity | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	696
Year two	198	1,109
Year three	1,514	1,079
Year four	733	576
Year five	232	552
Prior	4,172	6,319
Revolving Loans Amortized Cost Basis	33,388	34,242
Loans and leases	40,237	44,573
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	603	2,470
Year two	2,274	1,778
Year three	1,617	2,947
Year four	2,805	2,064
Year five	1,590	2,486
Prior	2,357	594
Revolving Loans Amortized Cost Basis	43,306	39,001
Loans and leases	54,552	51,340
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	1,089	4,230
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	144	363
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	26	377
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	18	218
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	11	2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	890	3,263
Consumer Portfolio Segment [Member] | Consumer Loan | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	56	432
Year two	482	356
Year three	373	1,913
Year four	1,875	189
Year five	142	255
Prior	462	77
Revolving Loans Amortized Cost Basis	30,934	25,699
Loans and leases	34,324	28,921
Consumer Portfolio Segment [Member] | Consumer Loan | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	9	1,318
Year two	975	586
Year three	536	486
Year four	465	730
Year five	596	690
Prior	833	381
Revolving Loans Amortized Cost Basis	6,149	7,180
Loans and leases	9,563	11,371
Consumer Portfolio Segment [Member] | Consumer Loan | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	392	526
Year two	618	570
Year three	435	358
Year four	324	981
Year five	720	1,210
Prior	781	79
Revolving Loans Amortized Cost Basis	4,520	3,549
Loans and leases	7,790	7,273
Consumer Portfolio Segment [Member] | Consumer Loan | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	146	69
Year two	122	169
Year three	176	129
Year four	92	153
Year five	118	303
Prior	250	56
Revolving Loans Amortized Cost Basis	1,134	1,983
Loans and leases	2,038	2,862
Consumer Portfolio Segment [Member] | Consumer Loan | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	125
Year two	77	97
Year three	97	61
Year four	49	11
Year five	14	28
Prior	31	1
Revolving Loans Amortized Cost Basis	569	590
Loans and leases	$ 837	$ 913

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 641,442	$ 635,737	$ 613,914	$ 594,741
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	589,109	577,663	554,750	533,125
Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 52,333	$ 58,074	$ 59,164	$ 61,616

Loans and Leases (Information o

Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 131,990	$ 47,128
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	78,090	47,057
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 2,563	$ 7

Loans and Leases - Troubled Deb

Loans and Leases - Troubled Debt Restructurings on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 131,990	$ 47,128
% of Total Class	0.30%	0.10%
Interest Receivable	$ 800	$ 200
Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 71,195	$ 29,891
% of Total Class	0.40%	0.20%
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 7,753	$ 17,116
% of Total Class	0.10%	0.10%
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 65	$ 121
% of Total Class	0%	0%
Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 556
% of Total Class	0%
Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 1,667
% of Total Class	0.10%
Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 49,990
% of Total Class	0.60%
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 764
% of Total Class	0%
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 2,563	$ 7
Interest Rate Reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 1,934	$ 7
Reduced weighted average interest rate	2.50%	4.50%
Interest Rate Reduction | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0	$ 0
Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0	0
Interest Rate Reduction | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Interest Rate Reduction | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Interest Rate Reduction | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Interest Rate Reduction | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	629
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	78,090	47,057
Term Extension | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 18,124	$ 29,884
Extended term	6 months	7 months 6 days
Term Extension | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 7,753	$ 17,116
Extended term	3 months 18 days	1 year
Term Extension | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0	$ 57
Extended term		8 years 9 months 18 days
Term Extension | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	556
Term Extension | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 1,667
Extended term	3 months 18 days
Term Extension | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 49,990
Extended term	8 months 12 days
Term Extension | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0
Combination - Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	1,299	$ 64
Combination - Term Extension and Interest Rate Reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	1,099	0
Combination - Term Extension and Interest Rate Reduction | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0	0
Combination - Term Extension and Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	65	$ 64
Combination - Term Extension and Interest Rate Reduction | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Combination - Term Extension and Interest Rate Reduction | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Combination - Term Extension and Interest Rate Reduction | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Combination - Term Extension and Interest Rate Reduction | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	135
Extended Maturity and Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted average interest rate		1.50%
Extended term		5 years 1 month 6 days
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	50,038
Payment Delay | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	50,038
Payment Delay | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Payment Delay | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Payment Delay | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Payment Delay | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Payment Delay | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0
Payment Delay | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0

Loans and Leases - Aging of Loa

Loans and Leases - Aging of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	$ 282,841	$ 208,525
Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	297,103	47,128
Non-accrual	108,404	26,427
Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	148,171	20,701
30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	18,103	0
60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	22,425	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Commercial non-mortgage | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	175,057	29,891
Non-accrual	97,587	26,329
Commercial non-mortgage | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	77,451	3,562
Commercial non-mortgage | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Commercial non-mortgage | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	19	0
Commercial non-mortgage | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Commercial real estate | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	25,028	17,116
Non-accrual	169	0
Commercial real estate | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	24,859	17,116
Commercial real estate | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Commercial real estate | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Equipment financing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,079
Non-accrual	317
Equipment financing | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,762
Equipment financing | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Equipment financing | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Equipment financing | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Residential | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,022
Non-accrual	764
Residential | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,258
Residential | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Residential | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Residential | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Home equity | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	596	121
Non-accrual	86	98
Home equity | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	510	23
Home equity | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Home equity | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	0
Home equity | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0	$ 0
Asset-based | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	42,331
Non-accrual	0
Asset-based | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	42,331
Asset-based | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Asset-based | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Asset-based | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Multi-family | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	49,990
Non-accrual	9,481
Multi-family | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
Multi-family | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	18,103
Multi-family | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	22,406
Multi-family | Financial Asset, Equal to or Greater than 90 Days Past Due | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 0

Loans and Leases (Details)

Loans and Leases (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest Rate Reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted average interest rate	2.50%	4.50%
Term Extension | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	6 months	7 months 6 days
Term Extension | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	3 months 18 days	1 year
Term Extension | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		8 years 9 months 18 days
Payment Deferral | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	6 months
Extended Maturity and Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		5 years 1 month 6 days
Reduced weighted average interest rate		1.50%

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 24, 2024	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Balance, beginning of period		$ 2,631,465	$ 2,514,104
Balance, end of period		2,868,068	2,631,465
Sterling
Goodwill [Roll Forward]
Goodwill acquired		0	(25,561)
Bend
Goodwill [Roll Forward]
Goodwill acquired		0	(294)
interLINK
Goodwill [Roll Forward]
Goodwill acquired		0	(143,216)
Ametros
Goodwill [Roll Forward]
Goodwill acquired		$ (236,603)	$ 0
Balance, end of period	$ 228,185
Goodwill, Other Increase (Decrease)	$ 8,400

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. 24, 2024	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 489,937	$ 301,037
Accumulated Amortization		107,096	97,902
Net Carrying Amount		382,841	203,135
Core deposits (1)
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		328,837	146,037
Accumulated Amortization		59,239	53,986
Net Carrying Amount		269,598	92,051
Core deposits (1) | Ametros
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life	25 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 182,800
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		151,000	151,000
Accumulated Amortization		46,654	43,116
Net Carrying Amount		104,346	107,884
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		4,000	4,000
Accumulated Amortization		1,000	800
Net Carrying Amount		3,000	3,200
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		6,100	0
Accumulated Amortization		203	0
Net Carrying Amount		$ 5,897	$ 0
Trade Names | Ametros
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life	5 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 6,100

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2024	$ 25,480
2025	31,094
2026	30,113
2027	29,558
2028	26,687
Thereafter	190,258
Customer-Related Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 49,700

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Non-interest-bearing:
Demand	$ 10,212,509	$ 10,732,516
Interest-bearing:
HSA	8,603,184	8,287,889
Checking	9,498,036	8,994,095
Money market	18,615,031	17,662,826
Savings	6,881,663	6,642,499
Time deposits	6,937,320	8,464,459
Total interest-bearing	50,535,234	50,051,768
Total deposits	60,747,743	60,784,284
Time deposits, money market, and interest-bearing checking obtained through brokers (1)	1,778,381	3,673,733
Aggregate amount of time deposit accounts that exceeded the FDIC limit	1,348,498	1,221,887
Demand deposit overdrafts reclassified as loan balances	12,251	10,432
Money market sweep deposits	$ 5,800,000	$ 5,700,000

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Deposit Liabilities [Abstract]
Remainder of 2024	$ 6,406,380
2025	414,440
2026	56,451
2027	33,809
2028	20,873
Thereafter	5,367
Time deposits	$ 6,937,320	$ 8,464,459

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 126,886	$ 358,387
Rate	0.12%	3.43%
Federal funds purchased
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 235,000	$ 100,000
Rate	5.44%	5.48%
Securities sold under agreements to repurchase and other borrowings
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 361,886	$ 458,387
Rate	3.58%	3.88%

Borrowings (Summary Of Advances

Borrowings (Summary Of Advances Payable To the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Total Outstanding	$ 3,650,000	$ 2,350,000
FHLB advances maturing after 1 but within 2 years, Total Outstanding	0	0
FHLB advances maturing after 2 but within 3 years, Total Outstanding	0	0
FHLB advances maturing after 3 but within 4 years, Total Outstanding	456	235
FHLB advances maturing after 4 but within 5 years, Total Outstanding	0	228
FHLB advances maturing after 5 years, Total Outstanding	9,474	9,555
Total FHLB advances	$ 3,659,930	$ 2,360,018
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]
FHLB advances maturing within 1 year, Weighted Average Contractual Coupon Rate (as a percent)	5.50%	5.53%
FHLB advances maturing after 1 but within 2 years, Weighted Average Contractual Coupon Rate (as a percent)	0%	0%
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)	1.36%	0%
FHLB advances maturing after 4 but within 5 years, Weighted Average Contractual Coupon Rate (as a percent)	0%	2.75%
FHLB advances maturing after 5 years, Weighted Average Contractual Coupon Rate (as a percent)	2.08%	2.07%
Federal Home Loan Bank, Advances, Weighted Average Contractual Coupon Rate (as a percent)	5.49%	5.52%
Aggregate market value of assets pledged as collateral	$ 20,238,325	$ 20,734,035
Remaining borrowing capacity at FHLB	$ 10,779,412	$ 12,535,423

Borrowings (Long Term Debt) (De

Borrowings (Long Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Notes and subordinated debt	$ 903,086	$ 1,036,974
Debt issuance cost on senior fixed-rates	(1,337)	(1,419)
Long-term debt	$ 914,520	$ 1,048,820
Variable interest rate	8.54%	8.59%
SOFR rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.95%
Senior Notes
Debt Instrument [Line Items]
Discount on senior fixed-rate notes	$ (498)	$ (537)
Senior Notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	4.375%
Notes and subordinated debt		132,550
Senior Notes | Senior Notes Due 2029
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	4.10%
Notes and subordinated debt	$ 326,766	328,104
Hedge basis adjustment	26,800	28,100
Subordinated Debt
Debt Instrument [Line Items]
Premium on subordinated fixed-to-floating rate notes	$ 13,269	13,802
Subordinated Debt | Subordinated Notes Due 2029
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	4%
Notes and subordinated debt	$ 274,000	274,000
Subordinated Debt | Subordinated Notes Due 2030
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	3.875%
Notes and subordinated debt	$ 225,000	225,000
Junior subordinated debt
Debt Instrument [Line Items]
Notes and subordinated debt	$ 77,320	$ 77,320

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	$ 903,086	$ 1,036,974
Debt issuance cost on senior fixed-rates	(1,337)	(1,419)
Long-term debt	914,520	1,048,820
Subordinated Debt
Assets Sold under Agreements to Repurchase [Line Items]
Premium on subordinated fixed-to-floating rate notes	13,269	13,802
Senior Notes
Assets Sold under Agreements to Repurchase [Line Items]
Debt Instrument, Unamortized Discount	(498)	(537)
Junior subordinated debt
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	77,320	77,320
Subordinated Notes Due 2029 | Subordinated Debt
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	$ 274,000	274,000
Senior notes, interest rate (as a percent)	4%
Subordinated Notes Due 2030 | Subordinated Debt
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	$ 225,000	225,000
Senior notes, interest rate (as a percent)	3.875%
Senior Notes | Senior Notes
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	$ 0
Senior Notes Due 2024 | Senior Notes
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt		132,550
Senior notes, interest rate (as a percent)	4.375%
Senior Notes Due 2029 | Senior Notes
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	$ 326,766	$ 328,104
Senior notes, interest rate (as a percent)	4.10%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 8,689,996	$ 8,056,186
Other comprehensive (loss) income before reclassifications	(75,432)	80,970
Amounts reclassified from accumulated other comprehensive (loss)	9,902	15,970
Other comprehensive (loss) income, net of tax	(65,530)	96,940
Ending Balance	8,747,498	8,294,294
Available For Sale and Transferred Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(517,450)	(631,160)
Other comprehensive (loss) income before reclassifications	(45,392)	56,635
Amounts reclassified from accumulated other comprehensive (loss)	9,121	14,983
Other comprehensive (loss) income, net of tax	(36,271)	71,618
Ending Balance	(553,721)	(559,542)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,869)	(8,874)
Other comprehensive (loss) income before reclassifications	(30,291)	20,782
Amounts reclassified from accumulated other comprehensive (loss)	302	592
Other comprehensive (loss) income, net of tax	(29,989)	21,374
Ending Balance	(32,858)	12,500
Defined Benefit Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(30,252)	(44,926)
Other comprehensive (loss) income before reclassifications	251	3,553
Amounts reclassified from accumulated other comprehensive (loss)	479	395
Other comprehensive (loss) income, net of tax	730	3,948
Ending Balance	(29,522)	(40,978)
Accumulated Other Comprehensive Income (Loss), Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(550,571)	(684,960)
Other comprehensive (loss) income, net of tax	(65,530)	96,940
Ending Balance	$ (616,101)	$ (588,020)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive (Loss) Income, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (69,346)	$ (65,829)
Net of tax	(9,902)	(15,970)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(302)	(592)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of accumualted comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	4	220
Net of tax	(302)	(592)
Hedge terminations	(34)	(76)
Premium amortization	(272)	(736)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial net loss amortization	(657)	(542)
Defined benefit pension and postretirement benefit plans
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(479)	(395)
Income tax expense	178	147
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	3,275
Net of tax	(9,121)	(14,983)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Reclassification out of accumualted comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized holding (losses)	$ (12,396)	(20,483)
Income tax expense		$ 5,500

Regulatory Capital and Restri_3

Regulatory Capital and Restrictions (Information On The Capital Ratios) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Amount	$ 5,923,041		$ 6,188,433
CET1 risk-based capital, Actual Ratio	0.1057		0.1111
CET1 risk-based capital, Minimum Requirement Amount	$ 2,521,412		$ 2,507,190
CET1 risk-based capital, Well Capitalized Amount	3,642,040		3,621,497
Total risk-based capital, Actual Amount	$ 7,400,017		$ 7,643,423
Total risk-based capital, Actual Ratio	0.1321		0.1372
Total risk-based capital, Capital Requirements, Minimum Amount	$ 4,482,510		$ 4,457,227
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080		0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 5,603,138		$ 5,571,534
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100
Tier 1 capital, Actual Amount	$ 6,207,020		$ 6,472,412
Tier 1 capital, Actual Ratio	0.1108		0.1162
Tier 1 capital, Capital Requirements, Minimum Amount	$ 3,361,883		$ 3,342,920
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 4,482,510		$ 4,457,227
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 6,207,020		$ 6,472,412
Tier 1 leverage capital ratio, Actual Ratio	0.0851		0.0906
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 2,916,558		$ 2,857,890
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	0.040		0.040
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 3,645,697		$ 3,572,362
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		0.050
Dividends paid	$ 175,000	$ 150,000
Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Amount	$ 6,588,389		$ 6,913,443
CET1 risk-based capital, Actual Ratio	0.1178		0.1243
CET1 risk-based capital, Minimum Requirement Amount	$ 2,516,948		$ 2,502,835
CET1 risk-based capital, Well Capitalized Amount	3,635,591		3,615,206
Total risk-based capital, Actual Amount	$ 7,191,796		$ 7,494,332
Total risk-based capital, Actual Ratio	0.1286		0.1347
Total risk-based capital, Capital Requirements, Minimum Amount	$ 4,474,574		$ 4,449,484
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080		0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 5,593,217		$ 5,561,855
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100
Tier 1 capital, Actual Amount	$ 6,588,389		$ 6,913,443
Tier 1 capital, Actual Ratio	0.1178		0.1243
Tier 1 capital, Capital Requirements, Minimum Amount	$ 3,355,930		$ 3,337,113
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 4,474,574		$ 4,449,484
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 6,588,389		$ 6,913,443
Tier 1 leverage capital ratio, Actual Ratio	0.0904		0.0969
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 2,913,783		$ 2,855,212
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	0.040		0.040
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 3,642,229		$ 3,569,015
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		0.050
Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Ratio	0.045		0.045
Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Ratio	0.045		0.045
Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Ratio	0.065		0.065
Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Ratio	0.065		0.065

Variable Interest Entities - Su

Variable Interest Entities - Summary of LIHTC Investments and Commitments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Income (Loss) from Affordable Housing Projects, Equity Method Investments	$ (28,024)	$ (21,898)
Amortization of low-income housing tax credit investments	20,413	21,478
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Gross investment in LIHTC	1,293,847		$ 1,135,192
Accumulated amortization	(161,612)		(141,199)
Net investment in LIHTC investments	1,132,235		993,993
Unfunded commitments for LIHTC investments	683,133		$ 549,258
Liabilities assumed	$ 158,700	$ 0

Variable Interest Entities - Na

Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Assets	$ 76,161,693		$ 74,945,249
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Liabilities assumed	158,700	$ 0
Assets	193,200		190,100
Unfunded Loan Commitment | Other Non-Marketable Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 306,300		$ 307,200

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	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share Reconciliation [Abstract]
Net income	$ 216,323	$ 221,004
Less: Preferred stock dividends	4,163	4,163
Earnings applicable to common stockholders	212,160	216,841
Net income available to common stockholders	212,160	216,841
Less: (Loss) earnings allocated to participating securities, basic	2,101	1,845
Less: (Loss) earnings allocated to participating securities, diluted	2,101	1,845
Earnings applicable to common stockholders	210,059	214,996
Earnings applicable to common stockholders	$ 210,059	$ 214,996
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average common shares outstanding - basic (in shares)	170,445	172,766
Effect of dilutive securities (in shares)	259	117
Weighted-average common shares outstanding - diluted (in shares)	170,704	172,883
Earnings Per Share, Basic and Diluted [Abstract]
Basic (loss) earnings per common share (in dollars per share)	$ 1.23	$ 1.24
Diluted (loss) earnings per common share (in shares)	$ 1.23	$ 1.24

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Restricted stock (due to performance conditions on non-participating shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	54,586	85,033

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	$ 9,408,742,000	$ 11,377,707,000
Asset Derivatives, Fair Value, before netting	363,542,000	330,636,000
Asset Derivatives, Fair Value, Less: Master netting agreements	61,395,000	55,949,000
Asset Derivatives, Fair Value, Less: Cash collateral posted	285,297,000	232,190,000
Total derivative instruments, after netting	16,850,000	42,497,000
Liability Derivatives, Notional Amount	14,037,672,000	11,703,252,000
Liability Derivatives, Fair Value	407,393,000	335,810,000
Liability Derivatives, Fair Value, Less: Master netting agreements	61,395,000	55,949,000
Liability Derivatives, Fair Value, Less: Cash collateral posted	0	0
Total derivative instruments, after netting	345,998,000	279,861,000
CME
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Less: Cash collateral posted	2,300,000
Total derivative instruments, after netting	0	0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	346,853,000	289,778,000
Asset Derivatives, Fair Value, Less: Master netting agreements	61,395,000	55,949,000
Total derivative instruments, after netting	285,297,000	232,190,000
Liability Derivatives, Fair Value	61,395,000	55,949,000
Liability Derivatives, Fair Value, Less: Master netting agreements	61,395,000	55,949,000
Total derivative instruments, after netting	0	0
Designated as Hedging Instrument | Interest rate derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	500,000,000	2,750,000,000
Asset Derivatives, Fair Value	263,000	11,140,000
Liability Derivatives, Notional Amount	4,750,000,000	2,700,000,000
Liability Derivatives, Fair Value	44,366,000	13,679,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	8,908,742,000	8,627,707,000
Asset Derivatives, Fair Value, Total	363,279,000	319,496,000
Liability Derivatives, Notional Amount	9,287,672,000	9,003,252,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement	363,027,000	322,131,000
Not Designated as Hedging Instrument | Interest rate derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	8,542,883,000	8,284,356,000
Asset Derivatives, Fair Value	362,602,000	319,122,000
Liability Derivatives, Notional Amount	8,542,895,000	8,272,197,000
Liability Derivatives, Fair Value	362,802,000	321,064,000
Not Designated as Hedging Instrument | Mortgage Banking Derivatives | RPA-Out
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	1,463,000	2,798,000
Asset Derivatives, Fair Value	15,000	37,000
Not Designated as Hedging Instrument | Mortgage Banking Derivatives | RPA-In
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	0	0
Liability Derivatives, Fair Value	0	0
Not Designated as Hedging Instrument | Other
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	364,396,000	340,553,000
Asset Derivatives, Fair Value	662,000	337,000
Liability Derivatives, Notional Amount	744,777,000	731,055,000
Liability Derivatives, Fair Value	225,000	1,067,000
Not Designated as Hedging Instrument | Interest Rate Swap, CME
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	91,000,000	113,800,000
Liability Derivatives, Notional Amount	0	0
Not Designated as Hedging Instrument | Credit Risk Contract | RPA-Out
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	300,500,000	299,200,000
Not Designated as Hedging Instrument | Credit Risk Contract | RPA-In
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	707,600,000	682,900,000
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Other commitment	$ 1,700,000	$ 1,000,000

Derivative Financial Instrume_4

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Asset Derivatives, Fair Value, Less: Master netting agreements	$ 61,395	$ 55,949
Asset derivatives	16,850	42,497
Liability Derivatives, Fair Value, Less: Master netting agreements	61,395	55,949
Liability derivatives	345,998	279,861
Hedge Accounting Positions
Derivative [Line Items]
Asset Derivatives, Fair Value	346,853	289,778
Asset Derivatives, Fair Value, Less: Master netting agreements	61,395	55,949
Asset derivatives	285,297	232,190
Asset derivatives, amounts not offset	161	1,639
Liability Derivatives, Fair Value	61,395	55,949
Liability Derivatives, Fair Value, Less: Master netting agreements	61,395	55,949
Liability derivatives	0	0
Liability derivatives, amounts not offset	$ 0	$ 0

Derivative Financial Instrume_5

Derivative Financial Instruments (Income Statement Effect) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 2,545	$ (4,438)
Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,290	(3,687)
Mortgage Banking Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(22)	(16)
Other | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,277	(735)
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(10,798)	(812)
Cash Flow Hedging | Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	34	76
Cash Flow Hedging | Interest Rate Derivatives | Other Income | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(10,764)	(736)
Fair Value Hedging [Member] | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,320	(192)
Fair Value Hedging [Member] | Operating Expense | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	10,427
Fair Value Hedging [Member] | Operating Expense | Designated as Hedging Instrument | Long-term Debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ (1,320)	$ (10,235)

Derivative Financial Instrume_6

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Unamortized balance	$ 0.3
Maximum length of time over which forecasted transactions are hedged	3 years
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ 30.4

Derivative Financial Instrume_7

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 285,297	$ 232,190
Maximum exposure	16,700
Debit (credit) valuation adjustment	7,500	$ 6,200
Cash and Due from Banks
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	290,300
Valuation, Market Approach
Derivative [Line Items]
Maximum exposure	112,000
CME
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 2,300

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jan. 11, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Broker dealer deposit program, fair value	$ 2,500,000,000
Unused commitments to extend credit	11,705,267,000	$ 12,563,441,000
Loans transferred to held for sale, fair value	239,300,000	3,900,000
Loans in process of foreclosure	9,100,000
Value under fair value options	323,000	2,610,000
Write-ups due to observable price changes	1,700,000
Write-downs due to impairment	(500,000)
interLINK
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration			$ 16,000,000
Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	5,600,000	9,100,000
Rabbi Trust
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	9,200,000	9,200,000
Alternative investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	27,900,000	29,800,000
Carrying amount of alternative investments	1,200,000	900,000
Remaining unfunded commitment	0
Write-down	300,000
Alternative investments carrying amount	38,600,000	35,900,000
Alternative investments | Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused commitments to extend credit	55,300,000	53,100,000
Unused commitments to extend credit, fair value	$ 1,400,000	$ 7,900,000

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Option, Disclosures) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]
Originated loans held for sale, fair value	$ 323	$ 2,610
Originated loans held for sale, unpaid principal balance	239,763	6,541
Originated loans held for sale, difference	7	(48)
loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Originated loans held for sale, unpaid principal balance	$ 316	$ 2,658

Fair Value Measurements (Fair_2

Fair Value Measurements (Fair Value Unobservable Inputs) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) holding	Dec. 31, 2023 USD ($) holding
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash Payment For Contingent Consideration Obligation	$ 4,600
Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration	182	$ 4,232
Re-sign Broker Dealers | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration	207	4,826
Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration	11,568	11,568
Deposit Program Growth | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration	$ 12,500	$ 12,500
Probability of Achievement | Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	0.990	0.990
Probability of Achievement | Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	1	1
Payment Term (in years) | Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Payment Term (in years)	1 year 7 months 17 days	1 year 10 months 17 days
Payment Term (in years) | Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Payment Term (in years)	9 months	1 year
Discount Rate | Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	0.0640	0.0640
Discount Rate | Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	0.0640	0.0640

Fair Value Measurements (Fair_3

Fair Value Measurements (Fair Value Assets And Liabilities Measured On Recurring and Nonrecurring Basis) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Total available-for-sale securities	$ 8,601,141	$ 8,959,729
Asset derivatives	16,850	42,497
Value under fair value options	323	2,610
Financial Liabilities:
Liability derivatives	345,998	279,861
Government agency debentures
Financial Assets:
Total available-for-sale securities	262,488	264,633
Municipal bonds and notes
Financial Assets:
Total available-for-sale securities	1,207,350	1,573,233
Agency CMO
Financial Assets:
Total available-for-sale securities	46,236	48,941
Agency MBS
Financial Assets:
Total available-for-sale securities	3,364,414	3,347,098
Agency CMBS
Financial Assets:
Total available-for-sale securities	2,321,230	2,288,071
Non-agency CMBS
Financial Assets:
Total available-for-sale securities	731,851	763,749
Corporate debt securities
Financial Assets:
Total available-for-sale securities	617,209	622,155
Private label MBS
Financial Assets:
Total available-for-sale securities	41,308	42,808
Other
Financial Assets:
Total available-for-sale securities	9,055	9,041
Fair Value, Recurring
Financial Assets:
Total available-for-sale securities	8,601,141	8,959,729
Alternative investments	1,221	959
Total financial assets	9,017,392	9,341,722
Financial Liabilities:
Liability derivatives	407,393	335,810
Contingent consideration	11,750	15,800
Liabilities, Fair Value Disclosure	419,143	351,610
Alternative Investments, Net Asset Value	38,620	35,888
Fair Value, Recurring | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Alternative investments	1,221	959
Total financial assets	14,360	13,076
Financial Liabilities:
Liability derivatives	160	970
Contingent consideration	0	0
Liabilities, Fair Value Disclosure	160	970
Alternative Investments, Net Asset Value	0	0
Fair Value, Recurring | Level 2
Financial Assets:
Total available-for-sale securities	8,601,141	8,959,729
Alternative investments	0	0
Total financial assets	8,964,412	9,292,758
Financial Liabilities:
Liability derivatives	407,233	334,840
Contingent consideration	0	0
Liabilities, Fair Value Disclosure	407,233	334,840
Alternative Investments, Net Asset Value	0	0
Fair Value, Recurring | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Alternative investments	0	0
Total financial assets	0	0
Financial Liabilities:
Liability derivatives	0	0
Contingent consideration	11,750	15,800
Liabilities, Fair Value Disclosure	11,750	15,800
Alternative Investments, Net Asset Value	0	0
Fair Value, Recurring | Derivative instruments
Financial Assets:
Asset derivatives	363,542	330,636
Fair Value, Recurring | Derivative instruments | Level 1
Financial Assets:
Asset derivatives	594	217
Fair Value, Recurring | Derivative instruments | Level 2
Financial Assets:
Asset derivatives	362,948	330,419
Fair Value, Recurring | Derivative instruments | Level 3
Financial Assets:
Asset derivatives	0	0
Fair Value, Recurring | Loan Origination Commitments
Financial Assets:
Value under fair value options	323	2,610
Fair Value, Recurring | Loan Origination Commitments | Level 1
Financial Assets:
Value under fair value options	0	0
Fair Value, Recurring | Loan Origination Commitments | Level 2
Financial Assets:
Value under fair value options	323	2,610
Fair Value, Recurring | Loan Origination Commitments | Level 3
Financial Assets:
Value under fair value options	0	0
Fair Value, Recurring | Investments Held In Rabbi Trust
Financial Assets:
Other assets	12,545	11,900
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 1
Financial Assets:
Other assets	12,545	11,900
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 2
Financial Assets:
Other assets	0	0
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 3
Financial Assets:
Other assets	0	0
Fair Value, Recurring | Government agency debentures
Financial Assets:
Total available-for-sale securities	262,488	264,633
Fair Value, Recurring | Government agency debentures | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Government agency debentures | Level 2
Financial Assets:
Total available-for-sale securities	262,488	264,633
Fair Value, Recurring | Government agency debentures | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Municipal bonds and notes
Financial Assets:
Total available-for-sale securities	1,207,350	1,573,233
Fair Value, Recurring | Municipal bonds and notes | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Municipal bonds and notes | Level 2
Financial Assets:
Total available-for-sale securities	1,207,350	1,573,233
Fair Value, Recurring | Municipal bonds and notes | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Agency CMO
Financial Assets:
Total available-for-sale securities	46,236	48,941
Fair Value, Recurring | Agency CMO | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Agency CMO | Level 2
Financial Assets:
Total available-for-sale securities	46,236	48,941
Fair Value, Recurring | Agency CMO | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Agency MBS
Financial Assets:
Total available-for-sale securities	3,364,414	3,347,098
Fair Value, Recurring | Agency MBS | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Agency MBS | Level 2
Financial Assets:
Total available-for-sale securities	3,364,414	3,347,098
Fair Value, Recurring | Agency MBS | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Agency CMBS
Financial Assets:
Total available-for-sale securities	2,321,230	2,288,071
Fair Value, Recurring | Agency CMBS | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Agency CMBS | Level 2
Financial Assets:
Total available-for-sale securities	2,321,230	2,288,071
Fair Value, Recurring | Agency CMBS | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Non-agency CMBS
Financial Assets:
Total available-for-sale securities	731,851	763,749
Fair Value, Recurring | Non-agency CMBS | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Non-agency CMBS | Level 2
Financial Assets:
Total available-for-sale securities	731,851	763,749
Fair Value, Recurring | Non-agency CMBS | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Total available-for-sale securities	617,209	622,155
Fair Value, Recurring | Corporate debt securities | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Corporate debt securities | Level 2
Financial Assets:
Total available-for-sale securities	617,209	622,155
Fair Value, Recurring | Corporate debt securities | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Private label MBS
Financial Assets:
Total available-for-sale securities	41,308	42,808
Fair Value, Recurring | Private label MBS | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Private label MBS | Level 2
Financial Assets:
Total available-for-sale securities	41,308	42,808
Fair Value, Recurring | Private label MBS | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Other
Financial Assets:
Total available-for-sale securities	9,055	9,041
Fair Value, Recurring | Other | Level 1
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Other | Level 2
Financial Assets:
Total available-for-sale securities	9,055	9,041
Fair Value, Recurring | Other | Level 3
Financial Assets:
Total available-for-sale securities	$ 0	$ 0

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Estimated Fair Values Of Significant Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 6,782,867	$ 6,264,623
Fair Value, Nonrecurring | Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,545,228	1,715,795
Held-to-maturity investment securities, net	7,679,891	7,074,588
Loans and leases, net	50,457,200	50,090,315
Securities sold under agreements to repurchase and other borrowings	361,886	458,387
FHLB advances	3,659,930	2,360,018
Long-term debt	914,520	1,048,820
Fair Value, Nonrecurring | Reported Value Measurement | Deposits Liabilities, other than time deposits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	53,810,423	52,319,825
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	6,937,320	8,464,459
Fair Value, Nonrecurring | Reported Value Measurement | Residential
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount	1,514	8,523
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,545,228	1,715,795
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	6,782,867	6,264,623
Securities sold under agreements to repurchase and other borrowings	361,867	458,380
FHLB advances	3,657,612	2,358,381
Long-term debt	852,877	999,918
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net	48,348,067	48,048,106
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Deposits Liabilities, other than time deposits | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	53,810,423	52,319,825
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Time Deposits | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	6,902,736	8,426,708
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Residential | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Fair value	$ 3,973	$ 24,495

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Segment	Jan. 01, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Deposits	$ 60,747,743		$ 60,784,284
Goodwill	$ 2,868,068		$ 2,631,465	$ 2,514,104
Revision of Prior Period, Reclassification, Adjustment
Segment Reporting Information [Line Items]
Deposits		$ 2,200,000
Goodwill		77,200
Loans and leases, net		$ 1,500,000

Segment Reporting (Operating Re

Segment Reporting (Operating Results and Total Assets Reportable Segments) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Goodwill	$ 2,868,068		$ 2,631,465	$ 2,514,104
Assets	76,161,693		74,945,249
Net interest income	567,739	$ 595,283
Non-interest income	99,353	70,766
Non-interest expense	335,923	332,467
Pre-tax, pre-provision net revenue	331,169	333,582
Provision (benefit) for credit losses	45,500	46,749
Income before income taxes	285,669	286,833
Income tax expense	69,346	65,829
Net income	216,323	221,004
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Goodwill	1,960,363		1,951,945
Assets	42,286,247		41,843,297
Net interest income	341,942	360,293
Non-interest income	34,280	33,720
Non-interest expense	106,225	98,833
Pre-tax, pre-provision net revenue	269,997	295,180
Provision (benefit) for credit losses	47,283	35,250
Income before income taxes	222,714	259,930
Income tax expense	49,220	57,964
Net income	173,494	201,966
Operating Segments | Healthcare Financial Services
Segment Reporting Information [Line Items]
Goodwill	285,670		57,485
Assets	509,012		122,421
Net interest income	86,138	71,730
Non-interest income	31,061	24,067
Non-interest expense	52,127	43,700
Pre-tax, pre-provision net revenue	65,072	52,097
Provision (benefit) for credit losses	0	0
Income before income taxes	65,072	52,097
Income tax expense	17,114	14,066
Net income	47,958	38,031
Operating Segments | Consumer Banking
Segment Reporting Information [Line Items]
Goodwill	622,035		622,035
Assets	12,268,347		12,327,403
Net interest income	205,777	234,604
Non-interest income	33,978	27,636
Non-interest expense	120,121	116,555
Pre-tax, pre-provision net revenue	119,634	145,685
Provision (benefit) for credit losses	(4,089)	2,571
Income before income taxes	123,723	143,114
Income tax expense	30,436	35,922
Net income	93,287	107,192
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Goodwill	0		0
Assets	21,098,087		$ 20,652,128
Net interest income	(66,118)	(71,344)
Non-interest income	34	(14,657)
Non-interest expense	57,450	73,379
Pre-tax, pre-provision net revenue	(123,534)	(159,380)
Provision (benefit) for credit losses	2,306	8,928
Income before income taxes	(125,840)	(168,308)
Income tax expense	(27,424)	(42,123)
Net income	$ (98,416)	$ (126,185)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 64,005	$ 59,715
Non-interest income	99,353	70,766
Ametros' Customers
Disaggregation of Revenue [Line Items]
Contract With Customer, Accounts Receivable	2,300
Contract With Customer, Deferred Revenue	20,800
Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	42,589	45,436
Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,622	4,427
Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,924	6,587
Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,870	3,265
Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	35,348
Non-interest income		11,051
Operating Segments | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12,642	11,430
Non-interest income	34,280	33,720
Operating Segments | Commercial Banking | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,842	4,236
Operating Segments | Commercial Banking | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,622	4,427
Operating Segments | Commercial Banking | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,178	2,767
Operating Segments | Commercial Banking | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Operating Segments | Commercial Banking | Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21,638
Non-interest income		22,290
Operating Segments | Healthcare Financial Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31,061	24,067
Non-interest income	31,061	24,067
Operating Segments | Healthcare Financial Services | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	22,052	22,092
Operating Segments | Healthcare Financial Services | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Operating Segments | Healthcare Financial Services | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Operating Segments | Healthcare Financial Services | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,009	1,975
Operating Segments | Healthcare Financial Services | Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Non-interest income		0
Operating Segments | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	19,364	23,364
Non-interest income	33,978	27,636
Operating Segments | Consumer Banking | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	14,796	19,178
Operating Segments | Consumer Banking | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Operating Segments | Consumer Banking | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,751	3,828
Operating Segments | Consumer Banking | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(183)	358
Operating Segments | Consumer Banking | Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	14,614
Non-interest income		4,272
Corporate, Non-Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	938	854
Non-interest income	34	(14,657)
Corporate, Non-Segment | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(101)	(70)
Corporate, Non-Segment | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Corporate, Non-Segment | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(5)	(8)
Corporate, Non-Segment | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,044	932
Corporate, Non-Segment | Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ (904)
Non-interest income		$ (15,511)

Commitments and Contingencies_2

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 11,705,267	$ 12,563,441
Standby letter of credit
Loss Contingencies [Line Items]
Unused commitments to extend credit	497,573	482,462
Commercial letter of credit
Loss Contingencies [Line Items]
Unused commitments to extend credit	36,300	54,382
Commitments to extend credit
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 11,171,394	$ 12,026,597

Commitments and Contingencies_3

Commitments and Contingencies (Reserve for Unfunded Commitments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Feb. 23, 2024	Feb. 22, 2024	Dec. 31, 2023	Nov. 29, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Proposed annual rate					0.0336%
Estimated Special Assessment Charge	$ 11,900			$ 47,200
Special Assessment, Estimated Loss Attributable To Protection Of Uninsured Depositors		$ 20,400,000	$ 16,300,000
Special Assessment, Increase From Estimated Loss Attributable To Protection Of Uninsured Depositors		$ 4,100,000
SEC Schedule, 12-09, Allowance, Credit Loss
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 24,500			$ 24,700