Webster Financial (WBS) 10-Q 7 Nov 23 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Nov. 03, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
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		172,035,064
Entity Central Index Key	0000801337
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2023
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	Sep. 30, 2023	Dec. 31, 2022
Assets:
Cash and due from banks	$ 406,300	$ 264,118
Interest-bearing deposits	1,766,431	575,825
Investment securities available-for-sale, at fair value	7,653,391	7,892,697
Investment securities held-to-maturity, net of allowance for credit losses of $203 and $182	6,875,772	6,564,697
Federal Home Loan Bank and Federal Reserve Bank stock	306,085	445,900
Loans held for sale ($837 and $1,991 valued under fair value option)	46,267	1,991
Loans and leases	50,088,146	49,764,426
Allowance for credit losses on loans and leases	(635,438)	(594,741)
Loans and leases, net	49,452,708	49,169,685
Deferred tax assets, net	478,926	371,634
Premises and equipment, net	431,698	430,184
Goodwill	2,631,465	2,514,104
Other intangible assets, net	211,752	199,342
Cash surrender value of life insurance policies	1,242,648	1,229,169
Accrued interest receivable and other assets	1,627,408	1,618,175
Total assets	73,130,851	71,277,521
Liabilities and stockholders' equity:
Non-interest-bearing	11,410,063	12,974,975
Interest-bearing	48,921,704	41,079,365
Total deposits	60,331,767	54,054,340
Securities sold under agreements to repurchase and other borrowings	157,491	1,151,830
Federal Home Loan Bank advances	1,810,218	5,460,552
Long-term debt	1,050,539	1,073,128
Accrued expenses and other liabilities	1,581,635	1,481,485
Total liabilities	64,931,650	63,221,335
Stockholders’ equity:
Common stock	1,828	1,828
Paid-in capital	6,164,846	6,173,240
Retained earnings	3,170,330	2,713,861
Treasury stock, at cost—10,721,945 and 8,770,472 shares	(506,003)	(431,762)
Accumulated other comprehensive (loss), net of tax	(915,779)	(684,960)
Total stockholders' equity	8,199,201	8,056,186
Total liabilities and stockholders' equity	73,130,851	71,277,521
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	Sep. 30, 2023	Dec. 31, 2022
Allowance	$ 203	$ 182
Value under fair value options	837	1,991
Loans held for sale, valued under fair value option	$ 837	$ 1,991
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)	10,721,945	8,770,472
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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest Income:
Interest and fees on loans and leases	$ 793,626	$ 525,960	$ 2,281,955	$ 1,303,774
Taxable interest and dividends on investments	123,635	77,570	371,974	200,832
Non-taxable interest on investment securities	13,511	13,999	40,730	36,465
Loans held for sale	17	40	454	73
Total interest income	930,789	617,569	2,695,113	1,541,144
Interest Expense:
Deposits	293,955	37,492	695,625	57,350
Securities sold under agreements to repurchase and other borrowings	50	6,242	7,940	9,876
Federal Home Loan Bank advances	40,196	13,814	196,878	17,034
Long-term debt	9,452	9,018	28,422	24,973
Total interest expense	343,653	66,566	928,865	109,233
Net interest income	587,136	551,003	1,766,248	1,431,911
Provision (benefit) for credit losses	36,500	36,531	114,747	237,619
Net interest income after provision for credit losses	550,636	514,472	1,651,501	1,194,292
Non-interest Income:
Deposit service fees	41,005	50,807	131,859	150,019
Loan and lease related fees	19,966	26,769	63,499	77,355
Wealth and investment services	7,254	11,419	21,232	33,260
Mortgage banking activities	42	86	230	616
Cash surrender value of life insurance policies	6,620	7,718	19,641	22,694
(Loss) on sale of investment securities	0	(2,234)	(16,795)	(2,234)
Other income	15,495	19,071	30,856	56,894
Total non-interest income	90,382	113,636	250,522	338,604
Non-interest Expense:
Compensation and benefits	180,333	173,983	526,838	545,641
Occupancy	18,617	23,517	59,042	93,725
Technology and equipment	55,261	45,283	151,442	142,182
Intangible assets amortization	8,899	8,511	27,589	23,700
Marketing	4,810	3,918	13,446	10,868
Professional and outside services	26,874	21,618	88,693	91,041
Deposit insurance	13,310	8,026	39,356	19,996
Other expense	54,474	45,215	132,728	120,930
Total non-interest expense	362,578	330,071	1,039,134	1,048,083
Income before income taxes	278,440	298,037	862,889	484,813
Income tax expense	51,965	64,069	180,442	85,281
Net income	226,475	233,968	682,447	399,532
Less: Preferred stock dividends	4,162	4,162	12,487	11,756
Net income available to common stockholders	222,313	229,806	669,960	387,776
Earnings applicable to common stockholders	$ 222,313	$ 229,806	$ 669,960	$ 387,776
Earnings per common share:
Basic (in dollars per share)	$ 1.29	$ 1.31	$ 3.85	$ 2.32
Diluted (in dollars per share)	$ 1.28	$ 1.31	$ 3.85	$ 2.32

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 226,475	$ 233,968	$ 682,447	$ 399,532
Other comprehensive (loss) income, net of tax:
Investment securities available-for-sale	(174,594)	(242,231)	(188,013)	(692,383)
Derivative instruments	(22,711)	(13,699)	(48,860)	(21,851)
Defined benefit pension and other postretirement benefit plans	349	361	6,054	(87)
Other comprehensive (loss), net of tax	(196,956)	(255,569)	(230,819)	(714,321)
Comprehensive income (loss)	$ 29,519	$ (21,601)	$ 451,628	$ (314,789)

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, 2021	$ 3,438,325				$ 145,037	$ 937	$ 1,108,594	$ 2,333,288				$ (126,951)	$ (22,580)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	399,532							399,532
Other comprehensive (loss), net of tax	(714,321)												(714,321)
Common stock dividends and equivalents	(178,049)							(178,049)
Preferred stock dividends			$ (5,906)	$ (5,850)						$ (5,906)	$ (5,850)
Common stock contribution to charitable foundation	10,500						(1,701)					12,201
Issued in business combination	5,180,124				138,942	891	5,040,291
Stock-based compensation	43,231						14,726					28,505
Exercise of stock options	635						(613)					1,248
Common shares acquired from stock compensation plan activity	(22,545)											(22,545)
Common stock repurchase program	(319,266)											(319,266)
Ending Balance at Sep. 30, 2022	7,826,410				283,979	1,828	6,161,297	2,543,015				(426,808)	(736,901)
Beginning Balance at Jun. 30, 2022	7,997,788				283,979	1,828	6,148,853	2,383,638				(339,178)	(481,332)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	233,968							233,968
Other comprehensive (loss), net of tax	(255,569)												(255,569)
Common stock dividends and equivalents	(70,429)							(70,429)
Preferred stock dividends			(1,968)	(2,194)						(1,968)	(2,194)
Common stock contribution to charitable foundation	10,500						(1,701)					12,201
Stock-based compensation	12,762						14,307					(1,545)
Exercise of stock options	138						(162)					300
Common shares acquired from stock compensation plan activity	(1,450)											(1,450)
Common stock repurchase program	(97,136)											(97,136)
Ending Balance at Sep. 30, 2022	7,826,410				283,979	1,828	6,161,297	2,543,015				(426,808)	(736,901)
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]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2022-02
Net income	$ 682,447							682,447
Other comprehensive (loss), net of tax	(230,819)												(230,819)
Common stock dividends and equivalents	(209,246)							(209,246)
Preferred stock dividends			(5,906)	(6,581)						(5,906)	(6,581)
Stock-based compensation	40,195						(6,368)					46,563
Exercise of stock options	1,723						(2,026)					3,749
Common shares acquired from stock compensation plan activity	(15,765)											(15,765)
Common stock repurchase program	(108,788)											(108,788)
Ending Balance at Sep. 30, 2023	8,199,201				283,979	1,828	6,164,846	3,170,330				(506,003)	(915,779)
Beginning Balance at Jun. 30, 2023	8,279,726				283,979	1,828	6,150,713	3,017,445				(455,416)	(718,823)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	226,475							226,475
Other comprehensive (loss), net of tax	(196,956)												(196,956)
Common stock dividends and equivalents	(69,428)							(69,428)
Preferred stock dividends			$ (1,968)	$ (2,194)						$ (1,968)	$ (2,194)
Stock-based compensation	14,383						14,133					250
Common shares acquired from stock compensation plan activity	(361)											(361)
Common stock repurchase program	(50,476)											(50,476)
Ending Balance at Sep. 30, 2023	$ 8,199,201				$ 283,979	$ 1,828	$ 6,164,846	$ 3,170,330				$ (506,003)	$ (915,779)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Common stock dividends/equivalents (in dollars per share)	$ 0.40	$ 0.40	$ 1.20	$ 1.20
Series F Preferred Stock
Preferred stock dividends (in dollars per share)	328.125	328.125	984.38	984.38
Series G Preferred Stock
Preferred stock dividends (in dollars per share)	$ 16.25	$ 16.25	$ 48.75	$ 48.75

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Operating Activities:
Net income		$ 682,447	$ 399,532
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		114,747	237,619
Deferred Income Tax Expense (Benefit)		(27,986)	(49,239)
Stock-based compensation		40,195	43,231
Common stock contribution to charitable foundation		0	10,500
Depreciation and amortization of property and equipment and intangible assets		58,649	62,403
(Accretion) and amortization of interest-earning assets and borrowings		(15,787)	(27,025)
Amortization of low-income housing tax credit investments		54,284	31,671
Amortization of mortgage servicing assets		1,061	2,151
Reduction of right-of-use lease assets		24,228	47,874
Net (gain) on sale, net of write-downs, of foreclosed properties and repossessed assets		(1,356)	(1,010)
Net loss on sale, net of write-downs, of property and equipment		3,862	6,507
Loss on sale of investment securities		16,795	2,234
(Gain) on extinguishment of long-term debt		(698)	0
Originations of loans held for sale		(9,900)	(29,628)
Proceeds from sale of loans held for sale		11,250	33,886
Net (gain) on mortgage banking activities		(219)	(529)
Net (gain) on sale of loans not originated for sale		(723)	(3,135)
(Increase) in cash surrender value of life insurance policies		(19,641)	(22,694)
(Gain) from life insurance policies		(3,063)	(2,494)
Increase (Decrease) in Derivative Assets and Liabilities		94,600	539,257
Increase (Decrease) in Other Operating Assets		(3,183)	(51,300)
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities		(128,728)	(169,146)
Net cash provided by operating activities		890,834	1,060,665
Investing Activities:
Purchases of available-for-sale securities		(930,546)	(1,099,810)
Proceeds from principal payments, maturities, and calls of available-for-sale securities		456,384	612,783
Proceeds from sale of available-for-sale securities		398,296	65,330
Purchases of held-to-maturity securities		(619,957)	(963,655)
Proceeds from principal payments, maturities, and calls of held-to-maturity securities		312,720	627,887
Net decrease (increase) in Federal Home Loan Bank and Federal Reserve Bank stock		139,815	(150,706)
Alternative investments (capital calls), net of distributions		(18,095)	(7,811)
Net (increase) in loans		(905,906)	(5,526,220)
Proceeds from sale of loans not originated for sale		512,622	648,573
Proceeds from sale of foreclosed properties and repossessed assets		4,443	2,071
Proceeds from sale of property and equipment		4,145	300
Additions to property and equipment		(33,980)	(18,526)
Proceeds from life insurance policies		17,207	17,002
Net cash received in merger with Sterling		0	513,960
Net cash (used for) investing activities		(820,498)	(5,333,229)
Financing Activities:
Net increase in deposits		6,267,722	889,964
Proceeds from Federal Home Loan Bank advances		18,000,000	13,150,000
Repayments of Federal Home Loan Bank advances		(21,650,334)	(9,650,280)
Proceeds from extinguishment of borrowings		0	2,548
Net (decrease) increase in securities sold under agreements to repurchase and other borrowings		(994,339)	560,786
Repayment of long-term debt		(16,752)	0
Dividends paid to common stockholders		(209,333)	(178,161)
Dividends paid to preferred stockholders		(12,487)	(9,562)
Exercise of stock options		1,723	635
Common stock repurchase program		(107,983)	(319,266)
Common shares acquired related to stock compensation plan activity		(15,765)	(22,545)
Net cash provided by financing activities		1,262,452	4,424,119
Net increase in cash and cash equivalents		1,332,788	151,555
Cash and cash equivalents, beginning of period		839,943	461,570
Cash and cash equivalents, end of period		2,172,731	613,125
Supplemental disclosure of cash flow information:
Interest paid		877,678	114,542
Income taxes paid		213,796	129,926
Non-cash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets		4,091	163
Transfer of loans and leases to loans held-for-sale		557,462	621,922
Sterling
Non-cash investing and financing activities:
Tangible assets acquired	[1]	17,607	26,919,975
Goodwill and other intangible assets	[1]	(25,561)	2,149,532
Common stock issued	[1]	0	5,041,182
Liabilities assumed	[1]	(7,954)	(24,403,343)
Sterling | Preferred Stock [Member]
Non-cash investing and financing activities:
Preferred stock exchanged	[1]	0	138,942
Bend Financial, Inc.
Investing Activities:
Net cash paid for acquisition of Bend		0	(54,407)
Non-cash investing and financing activities:
Tangible assets acquired	[1]	294	15,731
Goodwill and other intangible assets	[1]	(294)	38,966
Liabilities assumed	[1]	0	(290)
interLINK
Investing Activities:
Net cash paid for acquisition of Bend		(157,646)	0
Non-cash investing and financing activities:
Tangible assets acquired		6,417	0
Goodwill and other intangible assets		183,216	0
Liabilities assumed		(15,948)	0
Contingent consideration		$ 16,039	$ 0
[1]The non-cash merger and acquisition activities presented for 2023 reflect adjustments recorded within the one-year measurement period, which were identified as a result of extended information gathering and new information that arose from integration activities during the first quarter of 2023. Additional information regarding these amounts can be found within Note 2: Mergers and Acquisitions and Note 6: Goodwill and Other Intangible Assets.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations Webster Financial Corporation is a bank holding company and financial holding company under the BHC Act, incorporated under the laws of Delaware in 1986, and headquartered in Stamford, Connecticut. Webster Bank, along with its HSA Bank division, is a leading commercial bank in the Northeast that delivers a wide range of digital and traditional financial solutions to businesses, individuals, families, and partners across its three differentiated lines of business: Commercial Banking, HSA Bank, and Consumer Banking. While its core footprint spans from New York to Rhode Island and Massachusetts, certain businesses operate in extended geographies. HSA Bank is one of the largest providers of employee benefit solutions in the United States. 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, 2022. The results of operations for the nine months ended September 30, 2023, 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. 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. 2022-02—Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU No. 2022-02, which eliminates the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance in paragraphs 310-20-35-9 through 35-11 to determine whether a modification results in a new loan or a continuation of an existing loan. In addition, the Update requires that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost in the vintage disclosures required by paragraph 326-20-50-6. Modifications to borrowers experiencing financial difficulty include principal forgiveness, interest rate reductions, payment delays, term extensions, or combinations thereof. Expected losses or recoveries on loans where modifications have been granted to borrowers experiencing financial difficulty have been factored into the ACL on loans and leases. Upon adoption of ASU 2022-02, the Company is no longer required to use a discounted cash flow (or reconcilable) method to measure the ACL resulting from a modification with a borrower experiencing financial difficulty. Accordingly, the Company now applies the same credit loss methodology it uses for similar loans that were not modified. The Company adopted the Update on January 1, 2023. The Company elected the option to apply the modified retrospective transition method related to the recognition and measurement of TDRs, which resulted in a $5.9 million increase to the Allowance for credit losses on loans and leases and a $1.7 million decrease to DTAs, net, with a corresponding $4.2 million cumulative-effect adjustment to retained earnings as of the adoption date. The enhanced disclosure requirements provided for by the Update were adopted on a prospective basis. Reporting periods prior to the adoption of the Update are accounted for and presented in accordance with the applicable GAAP. Refer to Note 4: Loans and Leases for additional information regarding modifications granted to borrowers experiencing financial difficulty. ASU No. 2022-01—Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method In March 2022, the FASB issued ASU No. 2022-01—Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method, which expands the current last-of-layer method of hedge accounting that permits only one hedged layer to allow multiple hedged layers of a single closed portfolio. To reflect that expansion, the last-of-layer method is renamed the portfolio layer method. Additionally, the amendments in this Update: (i) expand the scope of the portfolio layer method to include non-prepayable assets; (ii) specify eligible hedging instruments in a single-layer hedge; (iii) provide additional guidance on the accounting for and disclosure of hedge basis adjustments; and (iv) specify how hedge basis adjustments should be considered when determining credit losses for the assets included in the closed portfolio. An entity may also reclassify debt securities classified in the held-to-maturity category at the date of adoption to the available-for-sale category only if the entity applies portfolio layer method hedging to one or more closed portfolios that include those debt securities within a 30-day period. The Company adopted the Update on January 1, 2023 on a prospective basis. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements. The Company did not reclassify any debt securities from the held-to-maturity category to the available-for-sale category as permitted upon adoption. ASU No. 2021-08—Business Combinations (Topic 805)—Accounting for Contract Assets and Contract Liabilities from Contracts with Customers In October 2021, the FASB issued ASU No. 2021-08—Business Combinations (Topic 805)—Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires that an acquirer recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606, Revenue from Contracts with Customers. At the acquisition date, an acquirer should account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The Company adopted the Update on January 1, 2023 on a prospective basis. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements. Relevant Accounting Standards Issued But Not Yet Adopted 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) 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 credit 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 Update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. The amendments generally must be applied on either a modified retrospective or retrospective basis with a cumulative-effect adjustment to retained earnings reflecting the difference between the previous method used to account for the tax equity investment and the application of the proportional amortization method since the investment was entered into. The adoption of this guidance is not expected to have a material impact on the Consolidated Financial Statements as the Company's 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 Update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. The amendments either may be applied prospectively to all new and existing leasehold improvements recognized on or after the adoption date with any remaining unamortized balance of existing leasehold improvements amortized over their remaining useful life to the common control group determined at that date; or retrospectively to the beginning of the period in which the entity first applied Topic 842, with any leasehold improvements that otherwise would not have been amortized or impaired recognized through a cumulative-effect adjustment to the opening balance of retained earnings at the beginning of the earliest period presented in accordance with Topic 842. The adoption of this guidance is not expected to have a material impact on the Consolidated Financial Statements as the Company's operating lease arrangements in which it is lessee are 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 Restrictions In June 2022, the FASB issued ASU No. 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions, which clarifies that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security, and therefore, is not considered in measuring fair value. The amendments also clarify that an entity cannot, as a separate unit of account, recognize and measure a contractual sale restriction, and 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 Update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. For all entities except investment companies, the amendments should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The adoption of this guidance is not expected to have a material impact on the Consolidated Financial Statements and disclosures. The Company does not currently consider contractual restrictions on the sale of an equity security in measuring fair value.

Mergers and Acquisitions

Mergers and Acquisitions	9 Months Ended
	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions interLINK Acquisition On January 11, 2023, Webster 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 provides the Company with access to a unique source of core deposit funding and scalable liquidity and adds another technology-enabled channel to its already differentiated, omnichannel deposit gathering capabilities. The 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 the determination of fair value for contingent consideration liabilities can be found within Note 14: Fair Value Measurements. The transaction 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. The Company's valuations of the assets acquired and liabilities assumed in the interLINK acquisition were considered final as of June 30, 2023. Bend Financial, Inc. Acquisition On February 18, 2022, Webster acquired 100% of the equity interests of Bend, a cloud-based platform solution provider for HSAs, in exchange for cash of $55.3 million. The transaction was accounted for as a business combination, and resulted in the addition of $19.6 million in net assets measured at fair value, which primarily comprised $15.9 million of internal use software and a $3.0 million customer relationship intangible asset. The Company's valuations of the assets acquired and liabilities assumed in the Bend acquisition were considered final as of March 31, 2023. Merger with Sterling Bancorp On January 31, 2022, Webster completed its merger with Sterling. The transaction was accounted for as a business combination. Accordingly, the purchase price was allocated to the assets acquired and liabilities assumed based on their fair values as of the merger effective date. The determination of fair value requires management to make estimates about discount rates, future expected cash flows, market conditions, and other future events that are highly subjective in nature and are subject to change. Fair value estimates of the assets acquired and liabilities assumed were subject to adjustment during the one-year measurement period following the closing of the merger if new information was obtained about facts and circumstances that existed as of the merger effective date that, if known, would have affected the measurement of the amounts recognized as of that date. Measurement period adjustments made during the first quarter of 2023 totaled a net $25.6 million, which pertained to other assets and other liabilities and their related deferred tax impact. The Company's valuations of the assets acquired and liabilities assumed in the merger with Sterling were considered final as of March 31, 2023. The following table summarizes the allocation of the purchase price to the fair value of the identifiable assets acquired and liabilities assumed from Sterling as of January 31, 2022: (In thousands) Unpaid Principal Balance Fair Value Purchase price consideration $ 5,180,300 Assets: Cash and due from banks 510,929 Interest-bearing deposits 3,207 Investment securities available-for-sale 4,429,948 Federal Home Loan Bank and Federal Reserve Bank Stock 150,502 Loans held for sale 23,517 Loans and leases: Commercial non-mortgage $ 5,570,782 5,527,657 Asset-based 694,137 683,958 Commercial real estate 6,790,600 6,656,405 Multi-family 4,303,381 4,255,906 Equipment financing 1,350,579 1,314,311 Warehouse lending 647,767 643,754 Residential 1,313,785 1,281,637 Home equity 132,758 122,553 Other consumer 12,559 12,525 Total loans and leases $ 20,816,348 20,498,706 Deferred tax assets, net (59,716) Premises and equipment 264,421 Other intangible assets 210,100 Bank-owned life insurance policies 645,510 Accrued interest receivable and other assets 986,729 Total assets acquired $ 27,663,853 Liabilities: Non-interest-bearing deposits $ 6,620,248 Interest-bearing deposits 16,643,755 Securities sold under agreements to repurchase and other borrowings 27,184 Long-term debt 516,881 Accrued expenses and other liabilities 589,689 Total liabilities assumed $ 24,397,757 Net assets acquired 3,266,096 Goodwill $ 1,914,204 In connection with the merger with Sterling, the Company recorded $1.9 billion of goodwill, which represents the excess of the purchase price over the fair value of the net assets acquired. Information regarding the allocation of goodwill to the Company's reportable segments can be found within Note 16: Segment Reporting. For a description of the valuation methodologies used to estimate the fair values of the significant assets acquired and liabilities assumed, refer to Note 2: Mergers and Acquisitions of the Company's Annual Report on Form 10-K for the year ended December 31, 2022. Merger-Related Expenses and Exit Activities The following table summarizes total merger-related expenses, which were primarily incurred in connection with the merger with Sterling: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Compensation and benefits (1) $ 9,583 $ 5,770 $ 27,370 $ 71,472 Occupancy (2) (79) 4,389 1,151 35,744 Technology and equipment (3) 9,652 1,478 14,780 21,375 Professional and outside services (4) 18,171 10,792 57,119 59,073 Marketing 1,574 64 2,535 199 Other expense (5) 22,724 3,043 28,883 12,808 Total merger-related expenses $ 61,625 $ 25,536 $ 131,838 $ 200,671 (1) Comprised primarily of severance and employee retention costs, and executive synergy stock awards. (2) Comprised primarily of charges associated with the Company's corporate real estate consolidation plan in 2022. (3) Comprised primarily of technology contract termination costs, and charges to support core conversion activities in 2023. (4) Comprised primarily of advisory, accounting, and other professional fees, and charges to support core conversion activities in 2023. The amount for the nine months ended September 30, 2023, includes a reduction of $1.7 million to a previously recorded contract termination charge during the three months ended March 31, 2023, due to a decrease in volume usage. (5) Comprised primarily of contract termination costs, disposals on property and equipment, and other miscellaneous expenses. The following tables summarize the change in accrued expenses and other liabilities as it relates to severance and contract termination costs, which were primarily incurred in connection with the merger with Sterling: Three months ended September 30, 2023 2022 (In thousands) Severance Contract Termination Total Severance Contract Termination Total Balance, beginning of period $ 3,169 $ 23,775 $ 26,944 $ 24,514 $ 17,704 $ 42,218 Additions charged to expense 3,557 14,000 17,557 840 — 840 Cash payments (971) (23,775) (24,746) (10,032) — (10,032) Other (166) — (166) (9) — (9) Balance, end of period $ 5,589 $ 14,000 $ 19,589 $ 15,313 $ 17,704 $ 33,017 Nine months ended September 30, 2023 2022 (In thousands) Severance Contract Termination Total Severance (1) Contract Termination Total Balance, beginning of period $ 7,583 $ 30,362 $ 37,945 $ 10,835 $ — $ 10,835 Additions charged to expense 11,741 14,000 25,741 35,619 17,704 53,323 Cash payments (12,509) (23,775) (36,284) (26,827) — (26,827) Other (1,226) (6,587) (7,813) (4,314) — (4,314) Balance, end of period $ 5,589 $ 14,000 $ 19,589 $ 15,313 $ 17,704 $ 33,017

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value U.S. Treasury notes $ 407,891 $ — $ (20,870) $ 387,021 Government agency debentures 302,164 — (53,628) 248,536 Municipal bonds and notes 1,646,582 2 (123,262) 1,523,322 Agency CMO 55,718 — (5,813) 49,905 Agency MBS 2,636,344 123 (383,832) 2,252,635 Agency CMBS 2,152,871 — (397,740) 1,755,131 CMBS 811,117 — (24,515) 786,602 Corporate debt 706,110 6 (104,534) 601,582 Private label MBS 46,921 — (7,043) 39,878 Other 9,823 — (1,044) 8,779 Total available-for-sale securities $ 8,775,541 $ 131 $ (1,122,281) $ 7,653,391 At December 31, 2022 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value U.S. Treasury notes $ 755,968 $ — $ (38,928) $ 717,040 Government agency debentures 302,018 — (43,644) 258,374 Municipal bonds and notes 1,719,110 5 (85,913) 1,633,202 Agency CMO 64,984 — (5,019) 59,965 Agency MBS 2,461,337 26 (303,339) 2,158,024 Agency CMBS 1,664,600 — (258,114) 1,406,486 CMBS 929,588 — (32,948) 896,640 CLO 2,108 — (1) 2,107 Corporate debt 795,999 — (91,587) 704,412 Private label MBS 48,895 — (4,646) 44,249 Other 12,548 — (350) 12,198 Total available-for-sale securities $ 8,757,155 $ 31 $ (864,489) $ 7,892,697 (1) Accrued interest receivable on available-for-sale securities of $42.5 million and $36.9 million at September 30, 2023, and December 31, 2022, 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 September 30, 2023 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ — $ — $ 387,021 $ (20,870) 14 $ 387,021 $ (20,870) Government agency debentures — — 248,536 (53,628) 19 248,536 (53,628) Municipal bonds and notes 34,562 (1,836) 1,484,023 (121,426) 416 1,518,585 (123,262) Agency CMO — — 49,905 (5,813) 36 49,905 (5,813) Agency MBS 339,979 (8,137) 1,883,669 (375,695) 477 2,223,648 (383,832) Agency CMBS 490,774 (39,102) 1,264,357 (358,638) 151 1,755,131 (397,740) CMBS 43,894 (1,004) 742,708 (23,511) 45 786,602 (24,515) Corporate debt — — 597,275 (104,534) 90 597,275 (104,534) Private label MBS — — 39,878 (7,043) 3 39,878 (7,043) Other — — 8,779 (1,044) 2 8,779 (1,044) Total $ 909,209 $ (50,079) $ 6,706,151 $ (1,072,202) 1,253 $ 7,615,360 $ (1,122,281) At December 31, 2022 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ 337,563 $ (19,167) $ 379,477 $ (19,761) 23 $ 717,040 $ (38,928) Government agency debentures 258,374 (43,644) — — 19 258,374 (43,644) Municipal bonds and notes 1,616,771 (85,913) — — 444 1,616,771 (85,913) Agency CMO 55,693 (4,640) 4,272 (379) 39 59,965 (5,019) Agency MBS 1,641,544 (206,412) 515,206 (96,927) 460 2,156,750 (303,339) Agency CMBS 485,333 (68,674) 921,153 (189,440) 132 1,406,486 (258,114) CMBS 273,150 (8,982) 598,490 (23,966) 52 871,640 (32,948) CLO — — 2,107 (1) 1 2,107 (1) Corporate debt 692,990 (89,692) 8,421 (1,895) 105 701,411 (91,587) Private label MBS 44,249 (4,646) — — 3 44,249 (4,646) Other 12,198 (350) — — 4 12,198 (350) Total $ 5,417,865 $ (532,120) $ 2,429,126 $ (332,369) 1,282 $ 7,846,991 $ (864,489) The $257.8 million increase in gross unrealized losses from December 31, 2022, to September 30, 2023, is primarily due to higher market 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 from a credit loss or other factors. At both September 30, 2023, and December 31, 2022, 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. At September 30, 2023, based on current market conditions and the Company's current targeted balance sheet composition strategy, the Company intends to hold its available-for-sale securities with unrealized loss positions through the anticipated recovery period, and it is more-likely-than-not that the Company will not have to sell these available-for-sale securities before the recovery of the entire amortized cost basis. 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 September 30, 2023 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 48,951 $ 47,286 After 1 year through 5 years 1,026,082 961,447 After 5 through 10 years 1,348,774 1,198,635 After 10 years 6,351,734 5,446,023 Total available-for-sale securities $ 8,775,541 $ 7,653,391 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 There were no sales of available-for-sale debt securities during the three months ended September 30, 2023. During the nine months ended September 30, 2023, the Company sold U.S. Treasury notes, Corporate debt securities, and Municipal bonds and notes classified as available-for-sale for proceeds of $398.3 million, which resulted in gross realized losses of $20.5 million, respectively. Because $3.8 million of the total loss recognized for the nine months ended September 30, 2023, was attributed to a decline in credit quality, those portions of the charges have been included in the Provision for credit losses on the accompanying Condensed Consolidated Statements of Income. During the three and nine months ended September 30, 2022, the Company sold Municipal bonds and notes classified as available-for-sale for proceeds of $65.3 million, which resulted in gross realized losses on sale of $2.2 million. Other Information The following table summarizes the carrying value of available-for-sale securities pledged for deposits, borrowings, and other purposes: (In thousands) At September 30, 2023 At December 31, 2022 Pledged for deposits $ 2,911,558 $ 2,573,072 Pledged for borrowings and other 3,991,253 1,195,101 Total available-for-sale securities pledged $ 6,902,811 $ 3,768,173 At September 30, 2023, the Company had callable available-for-sale securities with an aggregate carrying value of $2.5 billion. Held-to-Maturity The following tables summarize the amortized cost, fair value, and ACL on held-to-maturity securities by major type: At September 30, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 24,406 $ — $ (2,482) $ 21,924 $ — $ 24,406 Agency MBS 2,470,192 34 (428,971) 2,041,255 — 2,470,192 Agency CMBS 3,363,390 — (662,950) 2,700,440 — 3,363,390 Municipal bonds and notes 917,755 2 (96,878) 820,879 203 917,552 CMBS 100,232 — (9,056) 91,176 — 100,232 Total held-to-maturity securities $ 6,875,975 $ 36 $ (1,200,337) $ 5,675,674 $ 203 $ 6,875,772 At December 31, 2022 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 28,358 $ — $ (2,060) $ 26,298 $ — $ 28,358 Agency MBS 2,626,114 827 (339,592) 2,287,349 — 2,626,114 Agency CMBS 2,831,949 845 (407,648) 2,425,146 — 2,831,949 Municipal bonds and notes 928,845 1,098 (47,183) 882,760 182 928,663 CMBS 149,613 — (9,713) 139,900 — 149,613 Total held-to-maturity securities $ 6,564,879 $ 2,770 $ (806,196) $ 5,761,453 $ 182 $ 6,564,697 (1) Accrued interest receivable on held-to-maturity securities of $19.7 million and $24.2 million at September 30, 2023, and December 31, 2022, 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 September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Balance, beginning of period $ 216 $ 210 $ 182 $ 214 (Benefit) provision for credit losses (13) (1) 21 (5) Balance, end of period $ 203 $ 209 $ 203 $ 209 Contractual Maturities The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity: At September 30, 2023 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 8,334 $ 8,308 After 1 year through 5 years 57,037 56,361 After 5 through 10 years 363,281 333,255 After 10 years 6,447,323 5,277,750 Total held-to-maturity securities $ 6,875,975 $ 5,675,674 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 September 30, 2023, or December 31, 2022. 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: September 30, 2023 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Not Rated Agency CMO $ — $ 24,406 $ — $ — $ — $ — $ — $ — Agency MBS — 2,470,192 — — — — — — Agency CMBS — 3,363,390 — — — — — — Municipal bonds and notes 333,985 162,790 254,061 115,800 32,908 — 4,165 14,046 CMBS 100,232 — — — — — — — Total held-to-maturity securities $ 434,217 $ 6,020,778 $ 254,061 $ 115,800 $ 32,908 $ — $ 4,165 $ 14,046 December 31, 2022 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Not Rated Agency CMO $ — $ 28,358 $ — $ — $ — $ — $ — $ — Agency MBS — 2,626,114 — — — — — — Agency CMBS — 2,831,949 — — — — — — Municipal bonds and notes 336,035 163,312 255,235 116,870 38,177 4,165 — 15,051 CMBS 149,613 — — — — — — — Total held-to-maturity securities $ 485,648 $ 5,649,733 $ 255,235 $ 116,870 $ 38,177 $ 4,165 $ — $ 15,051 At September 30, 2023, and December 31, 2022, 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 September 30, 2023 At December 31, 2022 Pledged for deposits $ 1,623,674 $ 1,596,777 Pledged for borrowings and other 4,942,275 260,735 Total held-to-maturity securities pledged $ 6,565,949 $ 1,857,512 At September 30, 2023, the Company had callable held-to-maturity securities with an aggregate carrying value of $0.9 billion.

Loans and Leases

Loans and Leases	9 Months Ended
	Sep. 30, 2023
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 September 30, At December 31, 2022 Commercial non-mortgage $ 16,508,188 $ 16,392,795 Asset-based 1,632,962 1,821,642 Commercial real estate 13,348,495 12,997,163 Multi-family 7,234,759 6,621,982 Equipment financing 1,431,858 1,628,393 Warehouse lending 118,478 641,976 Commercial portfolio 40,274,740 40,103,951 Residential 8,228,451 7,963,420 Home equity 1,533,046 1,633,107 Other consumer 51,909 63,948 Consumer portfolio 9,813,406 9,660,475 Loans and leases $ 50,088,146 $ 49,764,426 The carrying amount of loans and leases at September 30, 2023, and December 31, 2022, includes net unamortized 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 September 30, 2023 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current (1) Total Loans Commercial non-mortgage $ 4,209 $ 1,551 $ 138 $ 110,891 $ 116,789 $ 16,391,399 $ 16,508,188 Asset-based — — — 10,325 10,325 1,622,637 1,632,962 Commercial real estate 1,404 — — 25,376 26,780 13,321,715 13,348,495 Multi-family 2,103 155 — 5,726 7,984 7,226,775 7,234,759 Equipment financing 32,271 765 — 7,972 41,008 1,390,850 1,431,858 Warehouse lending — — — — — 118,478 118,478 Commercial portfolio 39,987 2,471 138 160,290 202,886 40,071,854 40,274,740 Residential 12,920 3,329 — 27,623 43,872 8,184,579 8,228,451 Home equity 8,145 3,372 — 26,042 37,559 1,495,487 1,533,046 Other consumer 451 119 — 110 680 51,229 51,909 Consumer portfolio 21,516 6,820 — 53,775 82,111 9,731,295 9,813,406 Total $ 61,503 $ 9,291 $ 138 $ 214,065 $ 284,997 $ 49,803,149 $ 50,088,146 At December 31, 2022 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans Commercial non-mortgage $ 8,434 $ 821 $ 645 $ 71,884 $ 81,784 $ 16,311,011 $ 16,392,795 Asset-based 5,921 — — 20,024 25,945 1,795,697 1,821,642 Commercial real estate 1,494 23,492 68 39,057 64,111 12,933,052 12,997,163 Multi-family 1,157 — — 636 1,793 6,620,189 6,621,982 Equipment financing 806 9,988 — 12,344 23,138 1,605,255 1,628,393 Warehouse lending — — — — — 641,976 641,976 Commercial portfolio 17,812 34,301 713 143,945 196,771 39,907,180 40,103,951 Residential 8,246 3,083 — 25,424 36,753 7,926,667 7,963,420 Home equity 5,293 2,820 — 27,924 36,037 1,597,070 1,633,107 Other consumer 1,028 85 13 148 1,274 62,674 63,948 Consumer portfolio 14,567 5,988 13 53,496 74,064 9,586,411 9,660,475 Total $ 32,379 $ 40,289 $ 726 $ 197,441 $ 270,835 $ 49,493,591 $ 49,764,426 The following table provides additional information on non-accrual loans and leases: At September 30, 2023 At December 31, 2022 (In thousands) Non-accrual Non-accrual with No Allowance Non-accrual Non-accrual with No Allowance Commercial non-mortgage $ 110,891 $ 19,274 $ 71,884 $ 12,598 Asset-based 10,325 1,330 20,024 1,491 Commercial real estate 25,376 21,084 39,057 90 Multi-family 5,726 5,726 636 — Equipment financing 7,972 1,543 12,344 2,240 Commercial portfolio 160,290 48,957 143,945 16,419 Residential 27,623 11,440 25,424 10,442 Home equity 26,042 13,995 27,924 15,193 Other consumer 110 5 148 5 Consumer portfolio 53,775 25,440 53,496 25,640 Total $ 214,065 $ 74,397 $ 197,441 $ 42,059 Interest income on non-accrual loans and leases that would have been recognized had the loans and leases been current in accordance with their contractual terms totaled $7.8 million and $7.6 million for the three months ended September 30, 2023, and 2022, respectively, and $18.6 million and $14.1 million for the nine months ended September 30, 2023, and 2022, 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 September 30, 2023 2022 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 572,653 $ 56,258 $ 628,911 $ 511,745 $ 59,754 $ 571,499 Provision (benefit) 38,908 (3,069) 35,839 34,513 (3,161) 31,352 Charge-offs (27,360) (3,642) (31,002) (31,356) (1,453) (32,809) Recoveries 292 1,398 1,690 1,413 2,870 4,283 Balance, end of period $ 584,493 $ 50,945 $ 635,438 $ 516,315 $ 58,010 $ 574,325 At or for the nine months ended September 30, 2023 2022 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 533,125 $ 61,616 $ 594,741 $ 257,877 $ 43,310 $ 301,187 Adoption of ASU No. 2022-02 7,704 (1,831) 5,873 — — — Initial allowance for PCD loans and leases (1) — — — 78,376 9,669 88,045 Provision (benefit) 116,489 (7,580) 108,909 230,881 1,267 232,148 Charge-offs (75,715) (5,825) (81,540) (61,361) (3,469) (64,830) Recoveries 2,890 4,565 7,455 10,542 7,233 17,775 Balance, end of period $ 584,493 $ 50,945 $ 635,438 $ 516,315 $ 58,010 $ 574,325 Individually evaluated for credit losses 40,756 6,421 47,177 36,394 13,278 49,672 Collectively evaluated for credit losses $ 543,737 $ 44,524 $ 588,261 $ 479,921 $ 44,732 $ 524,653 (1) Represents the establishment of the initial reserve for PCD loans and leases, which is reported net of $48.3 million of day one charge-offs recognized at the date of acquisition in accordance with GAAP. Credit Quality Indicators To measure credit risk for the commercial portfolio, the Company employs a dual grade credit risk grading system for estimating the PD and LGD. The credit risk grade system assigns a rating to each borrower and to the facility, which together form a Composite Credit Risk Profile. The credit risk grade system categorizes borrowers by common financial characteristics that measure the credit strength of borrowers and facilities by common structural characteristics. The Composite Credit Risk Profile has ten grades, with each grade corresponding to a progressively greater risk of loss. Grades (1) to (6) are considered pass ratings, and grades (7) to (10) are considered criticized, as defined by the regulatory agencies. A (7) "Special Mention" rating has a potential weakness that, if left uncorrected, may result in deterioration of the repayment prospects for the asset. A (8) "Substandard" rating has a well-defined weakness that jeopardizes the full repayment of the debt. A (9) "Doubtful" rating has all of the same weaknesses as a substandard asset with the added characteristic that the weakness makes collection or liquidation in full given current facts, conditions, and values improbable. Assets classified as a (10) "Loss" rating are considered uncollectible and are charged-off. Risk ratings, which are assigned to differentiate risk within the portfolio, are reviewed on an ongoing basis and revised to reflect changes in a borrower's current financial position and outlook, risk profile, and the related collateral and structural position. Loan officers review updated financial information or other loan factors on at least an annual basis for all pass rated loans to assess the accuracy of the risk grade. Criticized loans undergo more frequent reviews and enhanced monitoring. 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 on at least a quarterly basis. The following tables summarize the amortized cost basis of commercial loans and leases by Composite Credit Risk Profile grade and origination year: At September 30, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Risk rating: Pass $ 1,998,598 $ 4,377,097 $ 1,434,709 $ 765,133 $ 630,440 $ 981,671 $ 5,629,505 $ 15,817,153 Special mention 13,863 87,572 75,247 33,537 11,929 18,921 71,822 312,891 Substandard 49,664 114,769 25,383 35,778 44,531 19,772 88,247 378,144 Total commercial non-mortgage 2,062,125 4,579,438 1,535,339 834,448 686,900 1,020,364 5,789,574 16,508,188 Current period gross write-offs 324 2,007 647 511 241 3,782 — 7,512 Asset-based: Risk rating: Pass 11,188 1,223 — 1,374 7,776 43,633 1,395,893 1,461,087 Special mention — — — — — — 75,025 75,025 Substandard — 3,901 — — 1,330 896 90,723 96,850 Total asset-based 11,188 5,124 — 1,374 9,106 44,529 1,561,641 1,632,962 Current period gross write-offs — — — — 13,189 3,000 — 16,189 Commercial real estate: Risk rating: Pass 1,606,944 3,505,510 1,940,429 1,330,879 1,268,342 3,252,414 167,848 13,072,366 Special mention 825 957 8,044 31,549 23,593 51,125 1,204 117,297 Substandard 23,411 17,455 16,681 15,426 37,360 48,499 — 158,832 Total commercial real estate 1,631,180 3,523,922 1,965,154 1,377,854 1,329,295 3,352,038 169,052 13,348,495 Current period gross write-offs 2,590 — 2,574 3,813 2,754 36,575 — 48,306 Multi-family: Risk rating: Pass 1,214,619 1,913,835 1,020,778 419,684 609,830 1,996,593 1 7,175,340 Special mention — — — 9,251 359 36,135 — 45,745 Substandard — — — 368 — 13,306 — 13,674 Total multi-family 1,214,619 1,913,835 1,020,778 429,303 610,189 2,046,034 1 7,234,759 Current period gross write-offs — — — — — 1,033 — 1,033 Equipment financing: Risk rating: Pass 270,568 321,562 268,145 214,395 211,682 76,550 — 1,362,902 Special mention — 1,436 1,589 — 10,642 6,850 — 20,517 Substandard — 5,887 7,020 9,347 13,727 12,458 — 48,439 Total equipment financing 270,568 328,885 276,754 223,742 236,051 95,858 — 1,431,858 Current period gross write-offs — — — 2,634 — 41 — 2,675 Warehouse lending: Risk rating: Pass — — — — — — 118,478 118,478 Total warehouse lending — — — — — — 118,478 118,478 Current period gross write-offs — — — — — — — — Total commercial portfolio $ 5,189,680 $ 10,351,204 $ 4,798,025 $ 2,866,721 $ 2,871,541 $ 6,558,823 $ 7,638,746 $ 40,274,740 Current period gross write-offs $ 2,914 $ 2,007 $ 3,221 $ 6,958 $ 16,184 $ 44,431 $ — $ 75,715 At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 5,154,781 $ 1,952,158 $ 965,975 $ 792,977 $ 593,460 $ 780,200 $ 5,670,532 $ 15,910,083 Special mention 104,277 15,598 21,168 263 14,370 7,770 40,142 203,588 Substandard 28,203 11,704 69,954 36,604 70,634 16,852 41,917 275,868 Doubtful — — — 1 — — 3,255 3,256 Total commercial non-mortgage 5,287,261 1,979,460 1,057,097 829,845 678,464 804,822 5,755,846 16,392,795 Asset-based: Pass 19,659 3,901 9,424 14,413 5,163 55,553 1,551,250 1,659,363 Special mention — — — — — — 80,476 80,476 Substandard — — — 1,491 — — 80,312 81,803 Total asset-based 19,659 3,901 9,424 15,904 5,163 55,553 1,712,038 1,821,642 Commercial real estate: Pass 3,420,635 2,246,672 1,556,185 1,605,869 1,058,730 2,681,052 97,832 12,666,975 Special mention 21,878 8,995 7,264 37,570 47,419 66,652 1,000 190,778 Substandard 519 2,459 216 31,163 47,021 57,997 — 139,375 Doubtful — — — 1 — 34 — 35 Total commercial real estate 3,443,032 2,258,126 1,563,665 1,674,603 1,153,170 2,805,735 98,832 12,997,163 Multi-family: Pass 1,992,980 1,057,705 507,065 694,066 444,564 1,748,337 51,655 6,496,372 Special mention 37,677 — — 95 40,307 726 8,838 87,643 Substandard — — 382 — 12,681 24,904 — 37,967 Total multi-family 2,030,657 1,057,705 507,447 694,161 497,552 1,773,967 60,493 6,621,982 Equipment financing: Pass 388,641 345,792 331,419 308,441 98,874 83,264 — 1,556,431 Special mention — 185 — 11,965 6,775 25 — 18,950 Substandard 314 16,711 18,436 5,016 5,307 7,228 — 53,012 Total equipment financing 388,955 362,688 349,855 325,422 110,956 90,517 — 1,628,393 Warehouse lending: Pass — — — — — — 641,976 641,976 Total warehouse lending — — — — — — 641,976 641,976 Total commercial portfolio $ 11,169,564 $ 5,661,880 $ 3,487,488 $ 3,539,935 $ 2,445,305 $ 5,530,594 $ 8,269,185 $ 40,103,951 The following tables summarize the amortized cost basis of consumer loans by FICO score and origination year: At September 30, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Residential: Risk rating: 800+ $ 146,015 $ 783,183 $ 1,080,117 $ 439,900 $ 152,423 $ 927,801 $ — $ 3,529,439 740-799 320,705 774,244 788,042 303,391 106,743 683,795 — 2,976,920 670-739 128,325 307,265 304,316 95,158 48,146 336,117 — 1,219,327 580-669 11,714 48,750 50,865 14,916 11,133 122,544 — 259,922 579 and below 1,322 51,996 8,697 189 116,917 63,722 — 242,843 Total residential 608,081 1,965,438 2,232,037 853,554 435,362 2,133,979 — 8,228,451 Current period gross write-offs — — 3 — — 348 — 351 Home equity: Risk rating: 800+ 20,653 27,163 34,930 25,418 7,914 59,074 409,133 584,285 740-799 20,009 22,878 31,037 15,529 5,887 35,482 351,533 482,355 670-739 13,299 15,757 14,689 5,940 3,418 31,292 250,737 335,132 580-669 2,083 3,261 1,875 1,281 1,266 11,419 66,901 88,086 579 and below 544 787 909 895 556 5,909 33,588 43,188 Total home equity 56,588 69,846 83,440 49,063 19,041 143,176 1,111,892 1,533,046 Current period gross write-offs — 3 81 — — 2,312 — 2,396 Other consumer: Risk rating: 800+ 345 434 1,968 336 509 134 21,869 25,595 740-799 1,172 709 565 838 1,102 447 4,144 8,977 670-739 406 588 383 1,143 1,826 154 9,644 14,144 580-669 55 143 123 246 461 67 1,203 2,298 579 and below 59 91 54 11 43 30 607 895 Total other consumer 2,037 1,965 3,093 2,574 3,941 832 37,467 51,909 Current period gross write-offs 2,354 7 3 203 286 225 — 3,078 Total consumer portfolio $ 666,706 $ 2,037,249 $ 2,318,570 $ 905,191 $ 458,344 $ 2,277,987 $ 1,149,359 $ 9,813,406 Current period gross write-offs $ 2,354 $ 10 $ 87 $ 203 $ 286 $ 2,885 $ — $ 5,825 At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Residential: 800+ $ 527,408 $ 954,568 $ 469,518 $ 160,596 $ 28,361 $ 997,409 $ — $ 3,137,860 740-799 963,026 946,339 311,295 111,913 43,684 689,771 — 3,066,028 670-739 381,515 350,671 103,999 62,365 18,451 384,687 — 1,301,688 580-669 40,959 49,648 14,484 5,836 2,357 138,107 — 251,391 579 and below 52,464 3,693 2,057 84,032 1,299 62,908 — 206,453 Total residential 1,965,372 2,304,919 901,353 424,742 94,152 2,272,882 — 7,963,420 Home equity: 800+ 25,475 35,129 25,612 7,578 12,545 55,352 465,318 627,009 740-799 26,743 35,178 17,621 8,111 7,765 32,270 398,692 526,380 670-739 18,396 16,679 8,175 3,635 7,614 30,060 259,646 344,205 580-669 2,848 3,068 1,520 1,456 1,163 13,607 76,614 100,276 579 and below 426 386 651 661 563 4,736 27,814 35,237 Total home equity 73,888 90,440 53,579 21,441 29,650 136,025 1,228,084 1,633,107 Other consumer: 800+ 495 218 544 1,045 247 56 19,196 21,801 740-799 888 2,624 1,959 2,494 941 364 12,218 21,488 670-739 977 603 2,480 4,238 1,041 118 6,107 15,564 580-669 211 117 337 801 173 54 2,223 3,916 579 and below 169 101 29 116 36 21 707 1,179 Total other consumer 2,740 3,663 5,349 8,694 2,438 613 40,451 63,948 Total consumer portfolio $ 2,042,000 $ 2,399,022 $ 960,281 $ 454,877 $ 126,240 $ 2,409,520 $ 1,268,535 $ 9,660,475 Collateral Dependent Loans and Leases A loan or lease is considered collateral dependent when the borrower is experiencing financial difficulty and repayment is substantially expected to be provided through the operation or sale of collateral. At September 30, 2023, and December 31, 2022, the carrying amount of collateral dependent commercial loans and leases totaled $35.9 million and $43.8 million, respectively, and the carrying amount of collateral dependent consumer loans totaled $41.0 million and $45.2 million, respectively. Commercial non-mortgage, asset-based, and equipment financing loans and leases are generally secured by machinery and equipment, inventory, receivables, or other non-real estate assets, whereas commercial real estate, multi-family, residential, home equity, and other consumer loans are secured by real estate. The ACL for collateral dependent loans and leases is individually assessed based on the fair value of the collateral less costs to sell. At September 30, 2023, and December 31, 2022, the collateral value associated with collateral dependent loans and leases totaled $110.6 million and $108.0 million, respectively. Modifications for Borrowers Experiencing Financial Difficulty On January 1, 2023, the Company adopted ASU 2022-02, which eliminates the accounting guidance for TDRs and enhances the disclosure requirements for certain loan modifications when a borrower is experiencing financial difficulty. For a description of the Company's accounting policies related to the accounting and reporting of TDRs, for which comparative period information is presented, refer to Note 1: Summary of Significant Accounting Policies of the Company's Annual Report on Form 10-K for the year ended December 31, 2022. 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 extension, 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 which allow borrowers to delay a scheduled loan payment to a later date. Deferred loan payments do not affect the original contractual terms of the loan. Modifications that result in only an insignificant payment delay are not disclosed. The Company considers that a three month or less payment delay generally would be considered 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 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 table summarizes the amortized cost basis at September 30, 2023, of loans modified to borrowers experiencing financial difficulty, disaggregated by class and type of concession granted: For the three months ended September 30, 2023 (In thousands) Interest Rate Reduction Term Extension Payment Delay Combination Term Extension and Interest Rate Reduction Combination Term Extension and Payment Delay Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness Total % of Total Class (2) Commercial non-mortgage $ — $ 26,970 $ — $ 940 $ 17,798 $ — $ 45,708 0.3 % Asset-based — 13,317 — — — 896 14,213 0.9 Commercial real estate — 768 — 17,247 506 — 18,521 0.1 Residential 257 138 — — — — 395 — Home equity 118 — 4 308 — — 430 — Total (1) $ 375 $ 41,193 $ 4 $ 18,495 $ 18,304 $ 896 $ 79,267 0.2 % For the nine months ended September 30, 2023 (In thousands) Interest Rate Reduction Term Extension Payment Delay Combination Term Extension and Interest Rate Reduction Combination Term Extension and Payment Delay Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness Total % of Total Class (2) Commercial non-mortgage $ — $ 65,470 $ 9,409 $ 1,253 $ 29,314 $ — $ 105,446 0.6 % Asset-based — 13,317 — — — 896 14,213 0.9 Commercial real estate — 3,928 182 17,247 506 — 21,863 0.2 Equipment financing — — 1,362 — — — 1,362 0.1 Residential 257 1,287 1,600 — — — 3,144 — Home equity 181 105 4 516 — — 806 0.1 Total (1) $ 438 $ 84,107 $ 12,557 $ 19,016 $ 29,820 $ 896 $ 146,834 0.3 % (1) The total amortized cost excludes accrued interest receivable of $0.2 million and $0.3 million for the three and nine months ended September 30, 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 table describes the financial effect of the modifications made to borrowers experiencing financial difficulty: For the three months ended September 30, 2023 Financial Effect Interest Rate Reduction: Residential Reduced weighted average interest rate by 2.3% Home equity Reduced weighted average interest rate by 0.3% Term Extension: Commercial non-mortgage Extended term by a weighted average of 1.3 years Asset-based Extended term by a weighted average of 0.4 years Commercial real estate Extended term by a weighted average of 0.8 years Residential Extended term by a weighted average of 4.9 years Payment Delay: Home equity Provided partial payment deferrals for a weighted average of 0.4 years Combination Term Extension and Interest Rate Reduction: Commercial non-mortgage Extended term by a weighted average of 0.6 years and reduced weighted average interest rate by 2.0% Commercial real estate Extended term by a weighted average of 3.0 years and reduced weighted average interest rate by 2.4% Home equity Extended term by a weighted average of 19.6 years and reduced weighted average interest rate by 2.5% Combination Term Extension and Payment Delay: Commercial non-mortgage Extended term by a weighted average of 1.2 years and provided partial payment deferrals for a weighted average of 2.0 years Commercial real estate Extended term by a weighted average of 0.5 years and provided payment deferrals for a weighted average of 0.5 years Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness: Asset-based Extended term by a weighted average of 4.6 years, reduced weighted average interest rate by 10.8%, and provided 1/3 principal forgiveness contingent upon payment For the nine months ended September 30, 2023 Financial Effect Interest Rate Reduction: Residential Reduced weighted average interest rate by 2.3% Home equity Reduced weighted average interest rate by 0.3% Term Extension: Commercial non-mortgage Extended term by a weighted average of 1.1 years Asset-based Extended term by a weighted average of 0.4 years Commercial real estate Extended term by a weighted average of 1.9 years Residential Extended term by a weighted average of 1.8 years Home equity Extended term by a weighted average of 11.5 years Payment Delay: Commercial non-mortgage Provided partial payment deferrals for a weighted average of 0.5 years Commercial real estate Provided payment deferrals for a weighted average of 0.3 years to be received at contractual maturity Equipment financing Provided partial payment deferrals for a weighted average of 0.5 years Residential Provided payment deferrals for a weighted average of 1.0 year Home equity Provided partial payment deferrals for a weighted average of 0.4 years Combination Term Extension and Rate Reduction: Commercial non-mortgage Extended term by a weighted average of 1.4 years and reduced weighted average interest rate by 1.8% Commercial real estate Extended term by a weighted average of 3.0 years and reduced weighted average interest rate by 2.4% Home equity Extended term by a weighted average of 16.8 years and reduced weighted average interest rate by 2.1% Combination Term Extension and Payment Delay: Commercial non-mortgage Extended term by a weighted average of 1.1 years and provided partial payment deferrals for a weighted average of 1.9 years Commercial real estate Extended term by a weighted average of 0.5 years and provided payment deferrals for a weighted average of 0.5 years Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness: Asset-based Extended term by a weighted average of 4.6 years, reduced weighted average interest rate by 10.8%, and provided 1/3 principal forgiveness contingent upon payment 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 table summarizes the aging of loans that have been modified in the nine months ended September 30, 2023: At September 30, 2023 (In thousands) Current 30-59 Days 60-89 Days 90+ Days Non-Accrual Total Commercial non-mortgage $ 51,613 $ — $ — $ — $ 53,833 $ 105,446 Asset-based 13,317 — — — 896 14,213 Commercial real estate 4,435 — — — 17,428 21,863 Equipment financing 1,362 — — — — 1,362 Residential 327 — — — 2,817 3,144 Home equity 240 — — — 566 806 Total $ 71,294 $ — $ — $ — $ 75,540 $ 146,834 Loans made to borrowers experiencing financial difficulty that were modified during the three or nine months ended September 30, 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 still 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. Troubled Debt Restructurings Prior to the Adoption of ASU 2022-02 The following table summarizes information related to TDRs: (In thousands) At December 31, 2022 Accrual status $ 110,868 Non-accrual status 83,954 Total TDRs $ 194,822 Additional funds committed to borrowers in TDR status $ 1,724 Specific reserves for TDRs included in the ACL on loans and leases: Commercial portfolio $ 14,578 Consumer portfolio 3,559 The following table summarizes loans and leases modified as TDRs by class and modification type during the three and nine months ended September 30, 2022: Three months ended September 30, 2022 Nine months ended September 30, 2022 (Dollars in thousands) Number of Recorded Investment (1) Number of Recorded Investment (1) Commercial non-mortgage Term extension 1 $ 24 3 $ 121 Combination - Term extension and interest rate reduction 3 322 8 765 Other (2) 15 17,408 16 40,372 Equipment financing Other (2) — — 1 1,157 Residential Extended maturity — — 1 893 Maturity/rate combined 1 124 1 124 Other (2) 1 298 7 3,060 Home equity Adjusted interest rate — — 1 74 Combination - Term extension and interest rate reduction 3 1,515 14 2,239 Other (2) 6 444 30 1,777 Total TDRs 30 $ 20,135 82 $ 50,582 (1) Post-modification balances approximated pre-modification balances. The aggregate amount of charge-offs due to restructurings was not significant. (2) Other included covenant modifications, forbearance, discharges under Chapter 7 bankruptcy, or other concessions. The portion of TDRs deemed to be uncollectible and charged-off totaled zero for the commercial portfolio and $0.1 million for the consumer portfolio for the three months ended September 30, 2022, and $10.0 million for the commercial portfolio and $0.2 million for the consumer portfolio for the nine months ended September 30, 2022. There were 5 loans and leases with an aggregated amortized cost of $0.9 million that were modified as TDRs within the previous 12 months and for which there was a payment default during the three and nine months ended September 30, 2022.

Transfers and Servicing of Fina

Transfers and Servicing of Financial Assets	9 Months Ended
	Sep. 30, 2023
Transfers and Servicing [Abstract]
Transfers and Servicing of Financial Assets	Transfers and Servicing of Financial Assets The Company originates and sells residential mortgage loans in the normal course of business, primarily to government-sponsored entities through established programs and securitizations. Residential mortgage origination fees, adjustments for changes in fair value, and any gain or loss recognized on residential mortgage loans sold are included in Mortgage banking activities on the accompanying Condensed Consolidated Statements of Income. The following table summarizes information related to mortgage banking activities: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Net gain on sale $ 51 $ 26 $ 219 $ 529 Origination fees 7 22 52 194 Fair value adjustment (16) 38 (41) (107) Mortgage banking activities $ 42 $ 86 $ 230 $ 616 Proceeds from sale $ 2,590 $ 1,053 $ 11,250 $ 33,886 Loans sold with servicing rights retained 633 147 5,981 30,464 Under certain circumstances, the Company may decide to sell loans that were not originated or otherwise acquired with the intent to sell. During the three months ended September 30, 2023, and 2022, the Company sold commercial loans not originated for sale for proceeds of $71.5 million and $530.1 million, respectively, which resulted in net gains (losses) on sale that were not significant. During the nine months ended September 30, 2023, and 2022, the Company sold commercial loans not originated for sale for proceeds of $512.6 million and $648.6 million, respectively, which resulted in net gains on sale of $0.7 million and $3.1 million, respectively. In addition, the Company may retain servicing rights on its residential mortgage loans sold in the normal course of business. At September 30, 2023, and December 31, 2022, the aggregate principal balance of residential mortgage loans serviced for others totaled $1.8 billion and $2.0 billion, respectively. Mortgage servicing rights are held at the lower of cost, net of accumulated amortization, or fair market value, and are included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets. The Company assesses mortgage servicing rights for impairment each quarter and establishes or adjusts the valuation allowance to the extent that amortized cost exceeds the estimated fair market value. The following table presents the change in the carrying amount for mortgage servicing rights: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Balance, beginning of period $ 8,858 $ 8,592 $ 9,515 $ 9,237 Acquired from Sterling — — — 859 Additions 13 1,627 65 1,892 Amortization (352) (382) (1,061) (2,151) Balance, end of period $ 8,519 $ 9,837 $ 8,519 $ 9,837 Loan servicing fees, net of mortgage servicing rights amortization, were $1.2 million and $1.3 million for the three months ended September 30, 2023, and 2022, respectively, and $3.8 million and $2.9 million for the nine months ended September 30, 2023, and 2022, respectively, and are included in Loan and lease related fees on the accompanying Condensed Consolidated Statements of Income. Information regarding the fair value of loans held for sale and mortgage servicing rights can be found within Note 14: Fair Value Measurements.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2023
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 September 30, At December 31, Balance, beginning of period $ 2,514,104 $ 538,373 interLINK acquisition 143,216 — Sterling merger (1) (25,561) 1,939,765 Bend acquisition (1) (294) 35,966 Balance, end of period $ 2,631,465 $ 2,514,104 (1) The 2023 changes reflect adjustments recorded within the one-year measurement period, which were identified in the first quarter as a result of extended information gathering and new information that arose from integration activities. The allocation of the purchase price and goodwill calculations for both the Sterling merger and Bend acquisition were final as of March 31, 2023. Information regarding goodwill by reportable segment can be found within Note 16: Segment Reporting. Other Intangible Assets The following table summarizes other intangible assets: At September 30, 2023 At December 31, 2022 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposits $ 146,037 $ 49,871 $ 96,166 $ 146,037 $ 36,710 $ 109,327 Customer relationships (1) 151,000 38,814 112,186 115,000 24,985 90,015 Non-competition agreement (1) 4,000 600 3,400 — — — Total other intangible assets $ 301,037 $ 89,285 $ 211,752 $ 261,037 $ 61,695 $ 199,342 (1) The increase in the gross carrying amount is attributed to the acquisition of interLINK during the first quarter of 2023, in which the Company identified and recorded a $36.0 million intangible asset for broker dealer relationships, which is being amortized on an accelerated basis over an estimated useful life of 10 years, and a $4.0 million non-competition agreement, which is being amortized on a straight-line basis over an estimated useful life of 5 years. The remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) At September 30, Remainder of 2023 $ 8,617 2024 29,618 2025 25,956 2026 25,565 2027 25,565 Thereafter 96,431

Deposits

Deposits	9 Months Ended
	Sep. 30, 2023
Deposit Liabilities [Abstract]
Deposits	Deposits The following table summarizes deposits by type: (In thousands) At September 30, At December 31, Non-interest-bearing: Demand $ 11,410,063 $ 12,974,975 Interest-bearing: Health savings accounts 8,229,889 7,944,892 Checking 8,826,265 9,237,529 Money market 17,755,198 11,062,652 Savings 6,622,833 8,673,343 Time deposits 7,487,519 4,160,949 Total interest-bearing $ 48,921,704 $ 41,079,365 Total deposits $ 60,331,767 $ 54,054,340 Time deposits, money market, and interest-bearing checking obtained through brokers (1) $ 3,050,332 $ 1,964,873 Aggregate amount of time deposit accounts that exceeded the FDIC limit 3,467,080 1,894,950 Demand deposit overdrafts reclassified as loan balances 9,867 8,721 (1) Excludes $5.2 billion of money market sweep deposits received through interLINK at September 30, 2023. The following table summarizes the scheduled maturities of time deposits: (In thousands) At September 30, Remainder of 2023 $ 3,454,002 2024 3,790,109 2025 137,311 2026 54,969 2027 34,419 Thereafter 16,709 Total time deposits $ 7,487,519

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Borrowings	Borrowings The following table summarizes securities sold under agreements to repurchase and other borrowings: At September 30, 2023 At December 31, 2022 (Dollars in thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) $ 157,491 0.12 % $ 282,005 0.11 % Federal funds purchased — — 869,825 4.44 Securities sold under agreements to repurchase and other borrowings $ 157,491 0.12 % $ 1,151,830 3.38 % (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 September 30, 2023 At December 31, 2022 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 1,800,113 5.55 % $ 5,450,187 4.40 % After 1 but within 2 years — — — — After 2 but within 3 years — — — — After 3 but within 4 years — — — — After 4 but within 5 years 471 1.35 252 — After 5 years 9,634 2.07 10,113 2.09 Total FHLB advances $ 1,810,218 5.53 % $ 5,460,552 4.39 % Aggregate carrying value of assets pledged as collateral $ 20,943,861 $ 13,692,379 Remaining borrowing capacity at FHLB 13,380,838 4,291,326 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 September 30, 2023, and December 31, 2022. The following table summarizes long-term debt: (Dollars in thousands) At September 30, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 (2) $ 132,550 $ 150,000 4.100% Senior fixed-rate notes due March 25, 2029 (3) 329,443 333,458 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 (4) 77,320 77,320 Total senior and subordinated debt 1,038,313 1,059,778 Discount on senior fixed-rate notes (592) (756) Debt issuance cost on senior fixed-rate notes (1,516) (1,824) Premium on subordinated fixed-to-floating rate notes 14,334 15,930 Long-term debt (1) $ 1,050,539 $ 1,073,128 (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 repurchased and retired $17.5 million of these senior notes at 96 cents on the dollar in May 2023. The resulting (3) The Company de-designated its fair value hedging relationship on these senior notes in 2020. A basis adjustment of $29.4 million and $33.5 million at September 30, 2023, and December 31, 2022, respectively, is included in the carrying value and is being amortized over the remaining life of the senior notes. (4) The interest rate on the Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month SOFR (previously

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income, Net of Tax	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	Accumulated Other Comprehensive (Loss) Income, Net of Tax The following tables summarize the changes in each component of accumulated other comprehensive (loss) income, net of tax: Three months ended September 30, 2023 Nine months ended September 30, 2023 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (644,579) $ (35,023) $ (39,221) $ (718,823) $ (631,160) $ (8,874) $ (44,926) $ (684,960) Other comprehensive (loss) income before reclassifications (174,594) (23,132) — (197,726) (203,031) (50,473) 3,553 (249,951) Amounts reclassified from accumulated other comprehensive (loss) — 421 349 770 15,018 1,613 2,501 19,132 Other comprehensive (loss) income, net of tax (174,594) (22,711) 349 (196,956) (188,013) (48,860) 6,054 (230,819) Balance, end of period $ (819,173) $ (57,734) $ (38,872) $ (915,779) $ (819,173) $ (57,734) $ (38,872) $ (915,779) Three months ended September 30, 2022 Nine months ended September 30, 2022 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (445,616) $ (2,082) $ (33,634) $ (481,332) $ 4,536 $ 6,070 $ (33,186) $ (22,580) Other comprehensive (loss) (243,872) (14,416) (248) (258,536) (694,024) (24,099) (1,295) (719,418) Amounts reclassified from accumulated other comprehensive (loss) 1,641 717 609 2,967 1,641 2,248 1,208 5,097 Other comprehensive (loss) income, net of tax (242,231) (13,699) 361 (255,569) (692,383) (21,851) (87) (714,321) Balance, end of period $ (687,847) $ (15,781) $ (33,273) $ (736,901) $ (687,847) $ (15,781) $ (33,273) $ (736,901) The following table further summarizes the amounts reclassified from accumulated other comprehensive (loss) income: Accumulated Other Comprehensive Three months ended Nine months ended Associated Line Item on the September 30, September 30, 2023 2022 2023 2022 (In thousands) Investment securities available-for-sale: Net holding (losses) $ — $ (2,234) $ (20,531) $ (2,234) (Loss) on sale of investment securities Tax benefit — 593 5,513 593 Income tax expense Net of tax $ — $ (1,641) $ (15,018) $ (1,641) Derivative instruments: Hedge terminations $ (67) $ (76) $ (242) $ (229) Interest expense Premium amortization (510) (909) (1,970) (2,856) Interest income Tax benefit 156 268 599 837 Income tax expense Net of tax $ (421) $ (717) $ (1,613) $ (2,248) Defined benefit pension and other postretirement benefit plans: Actuarial net loss amortization $ (479) $ (835) $ (1,562) $ (1,657) Other expense Other — — (1,869) — Other expense Tax benefit 130 226 930 449 Income tax expense Net of tax $ (349) $ (609) $ (2,501) $ (1,208)

Regulatory Capital and Restrict

Regulatory Capital and Restrictions	9 Months Ended
	Sep. 30, 2023
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 (such provisions apply to the Bank only), both the Holding Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated pursuant to regulatory directives. Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by Basel III to ensure capital adequacy require the Company to maintain minimum ratios of CET1 capital to total risk-weighted assets (CET1 risk-based capital), Tier 1 capital to total risk-weighted assets (Tier 1 risk-based capital), Total capital to total risk-weighted assets (Total risk-based capital), and Tier 1 capital to average tangible assets (Tier 1 leverage capital), as defined in the regulations. CET1 capital consists of common stockholders’ equity less deductions for goodwill and other intangible assets, and certain deferred tax adjustments. Upon adoption of Basel III, the Company elected to opt-out of the requirement to include certain components of AOCI in CET1 capital. Tier 1 capital consists of CET1 capital plus preferred stock. Total capital consists of Tier 1 capital and Tier 2 capital, as defined in the regulations. Tier 2 capital includes permissible portions of subordinated debt and the ACL. At September 30, 2023, and December 31, 2022, both the Holding Company and the Bank were classified as well-capitalized. Management believes that no events or changes have occurred subsequent to year-end that would change this designation. The following tables provides information on the capital ratios for the Holding Company and the Bank: At September 30, 2023 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 6,048,469 11.12 % $ 2,447,347 4.5 % $ 3,535,056 6.5 % Total risk-based capital 7,497,339 13.79 4,350,838 8.0 5,438,548 10.0 Tier 1 risk-based capital 6,332,448 11.64 3,263,129 6.0 4,350,838 8.0 Tier 1 leverage capital 6,332,448 8.83 2,869,002 4.0 3,586,253 5.0 Webster Bank CET1 risk-based capital $ 6,790,765 12.51 % $ 2,443,048 4.5 % $ 3,528,848 6.5 % Total risk-based capital 7,365,002 13.57 4,343,197 8.0 5,428,997 10.0 Tier 1 risk-based capital 6,790,765 12.51 3,257,398 6.0 4,343,197 8.0 Tier 1 leverage capital 6,790,765 9.48 2,866,587 4.0 3,583,234 5.0 At December 31, 2022 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 5,822,369 10.71 % $ 2,446,344 4.5 % $ 3,533,608 6.5 % Total risk-based capital 7,203,029 13.25 4,349,056 8.0 5,436,320 10.0 Tier 1 risk-based capital 6,106,348 11.23 3,261,792 6.0 4,349,056 8.0 Tier 1 leverage capital 6,106,348 8.95 2,730,212 4.0 3,412,765 5.0 Webster Bank CET1 risk-based capital $ 6,661,504 12.28 % $ 2,442,058 4.5 % $ 3,527,417 6.5 % Total risk-based capital 7,165,935 13.20 4,341,437 8.0 5,426,796 10.0 Tier 1 risk-based capital 6,661,504 12.28 3,256,078 6.0 4,341,437 8.0 Tier 1 leverage capital 6,661,504 9.77 2,727,476 4.0 3,409,345 5.0 (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 dividends to the Holding Company totaling $250.0 million and $500.0 million for the three and nine months ended September 30, 2023, respectively, and $250.0 million and $375.0 million for the three and nine months ended September 30, 2022, respectively, for which no express approval from the OCC was required. Cash Restrictions

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2023
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 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, 2022. 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 14: 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) September 30, 2023 December 31, 2022 Gross investment in LIHTC investments $ 921,100 $ 797,453 Accumulated amortization (123,708) (69,424) Net investment in LIHTC investments $ 797,392 $ 728,029 Unfunded commitments for LIHTC investments $ 391,896 $ 335,959 The aggregate carrying value of the Company's LIHTC investments is included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets, and represents the Company's maximum exposure to loss. The related unfunded commitments are included in Accrued expenses and other liabilities on the accompanying Condensed Consolidated Balance Sheets. There were $120.9 million and $123.4 million of net commitments approved to fund LIHTC investments during the nine months ended September 30, 2023, and 2022, respectively. 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 8: 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 $179.5 million and $144.9 million at September 30, 2023, and December 31, 2022, 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 $299.9 million and $243.9 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	9 Months Ended
	Sep. 30, 2023
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 September 30, Nine months ended September 30, (In thousands, except per share data) 2023 2022 2023 2022 Net income $ 226,475 $ 233,968 $ 682,447 $ 399,532 Less: Preferred stock dividends 4,162 4,162 12,487 11,756 Net income available to common stockholders 222,313 229,806 669,960 387,776 Less: Earnings allocated to participating securities 2,146 2,128 6,211 3,562 Earnings applicable to common stockholders $ 220,167 $ 227,678 $ 663,749 $ 384,214 Weighted-average common shares outstanding - basic 171,210 173,868 172,233 165,743 Add: Effect of dilutive stock options and restricted stock 140 76 93 70 Weighted-average common shares outstanding - diluted 171,350 173,944 172,326 165,813 Basic earnings per common share $ 1.29 $ 1.31 $ 3.85 $ 2.32 Diluted earnings per common share 1.28 1.31 3.85 2.32 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 Potential common shares from performance-based restricted stock that were not included in the computation of dilutive earnings per common share because they were anti-dilutive under the treasury stock method were 96,415 and 187,349 for the three and nine months ended September 30, 2023, respectively, and 97,294 and 330,688 for the three and nine months ended September 30, 2022, respectively.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 450,000 $ 8 $ 5,400,000 $ 77,384 Not designated as hedging instruments: Interest rate derivatives (1) 7,580,155 472,844 7,546,167 479,766 Mortgage banking derivatives (2) 1,113 8 — — Other (3) 264,524 749 684,520 118 Total not designated as hedging instruments 7,845,792 473,601 8,230,687 479,884 Gross derivative instruments, before netting $ 8,295,792 473,609 $ 13,630,687 557,268 Less: Master netting agreements 78,044 78,044 Cash collateral 392,408 — Total derivative instruments, after netting $ 3,157 $ 479,224 At December 31, 2022 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 1,350,000 $ 1,515 $ 1,750,000 $ 9,632 Not designated as hedging instruments: Interest rate derivatives (1) 7,024,507 221,225 7,022,844 403,952 Mortgage banking derivatives (2) 3,283 32 — — Other (3) 161,934 134 606,478 915 Total not designated as hedging instruments 7,189,724 221,391 7,629,322 404,867 Gross derivative instruments, before netting $ 8,539,724 222,906 $ 9,379,322 414,499 Less: Master netting agreements 16,129 16,129 Cash collateral 184,095 — Total derivative instruments, after netting $ 22,682 $ 398,370 (1) Balances related to clearing houses are presented as a single unit of account. In accordance with their rule books, clearing houses legally characterize variation margin payments as settlement of derivatives rather than collateral against derivative positions. At September 30, 2023, and December 31, 2022, notional amounts of interest rate swaps cleared through clearing houses include $0.1 billion and $2.7 billion for asset derivatives, respectively, and $0.4 billion and zero for liability derivatives, respectively. The related fair values approximate zero. (2) Notional amounts related to residential loans exclude approved floating rate commitments of $2.2 million and $2.4 million at September 30, 2023, and December 31, 2022, 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 include $206.4 million and $125.6 million for asset derivatives and $667.6 million and $559.2 million for liability derivatives at September 30, 2023, and December 31, 2022, respectively, which have insignificant related fair values. The following tables present fair value positions transitioned from gross to net upon applying counterparty netting agreements: At September 30, 2023 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Pledged Net Amount Presented Amounts Not Offset Asset derivatives $ 472,969 $ 78,044 $ 392,408 $ 2,517 $ 2,538 Liability derivatives 78,044 78,044 — — 6,442 At December 31, 2022 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Pledged Net Amount Presented Amounts Not Offset Asset derivatives $ 217,246 $ 16,129 $ 184,095 $ 17,022 $ 17,392 Liability derivatives 16,129 16,129 — — 1,545 Derivative Activity The following table summarizes the income statement effect of derivatives designated as hedging instruments: Recognized In Three months ended September 30, Nine months ended September 30, (In thousands) Net Interest Income 2023 2022 2023 2022 Fair value hedges: Interest rate derivatives Deposits interest expense $ 7,393 $ — $ 8,086 $ — Hedged item Deposits interest expense (6,145) — (5,870) — Net recognized on fair value hedges $ (1,248) $ — $ (2,216) $ — Cash flow hedges: Interest rate derivatives Long-term debt interest expense $ 68 $ 76 $ 243 $ 229 Interest rate derivatives Interest and fees on loans and leases (4,197) (483) (5,657) 3,320 Net recognized on cash flow hedges $ (4,265) $ (559) $ (5,900) $ 3,091 The following table summarizes information related to fair value hedging adjustments: Condensed Consolidated Balance Sheet Line Item in Which Hedged Item is Located Notional Amount of Hedged Item Carrying Amount of Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount (In thousands) At September 30, At December 31, At September 30, At December 31, At September 30, At December 31, Deposits $ 400,000 $ — $ 394,130 $ — $ (5,870) $ — Long-term debt (1) 300,000 300,000 329,443 333,458 29,443 33,458 (1) The Company de-designated its fair value hedging relationship on its long-term debt in 2020. The basis adjustment included in the carrying amount is being amortized into interest expense over the remaining life of the long-term debt. 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. At September 30, 2023, the remaining unamortized balance of time-value premiums was $0.9 million. Over the next twelve months, an estimated decrease to interest income of $42.0 million will be reclassified from AOCI relating to cash flow hedge gain/loss, and an estimated increase to interest expense of $0.1 million will be reclassified from AOCI relating to cash flow hedge terminations. At September 30, 2023, the remaining unamortized loss on terminated cash flow hedges was $0.1 million. The maximum length of time over which forecasted transactions are hedged is 4.4 years. Additional information regarding cash flow hedge activity impacting AOCI and the related amounts reclassified to net income can be found within Note 9: Accumulated Other Comprehensive (Loss) Income, Net of Tax. The following table summarizes the income statement effect of derivatives not designated as hedging instruments: Recognized In Three months ended September 30, Nine months ended September 30, (In thousands) Non-interest Income 2023 2022 2023 2022 Interest rate derivatives Other income $ 1,474 $ 6,032 $ (2,407) $ 25,291 Mortgage banking derivatives Mortgage banking activities 4 31 (24) (47) Other Other income 1,552 3,196 (104) 4,620 Total not designated as hedging instruments $ 3,030 $ 9,259 $ (2,535) $ 29,864 Derivative Exposure. At September 30, 2023, the Company had $6.5 million in initial margin collateral posted at clearing houses. In addition, $398.9 million of cash collateral received is 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. Current net credit exposure relating to derivatives with the Bank's customers was $0.6 million at September 30, 2023. In addition, the Company monitors potential future exposure, representing its best estimate of exposure to remaining contractual maturity. The potential future exposure relating to derivatives with the Bank's customers totaled $102.4 million at September 30, 2023. The Company has incorporated a valuation adjustment to reflect non-performance risk in the fair value measurement of its derivatives, which totaled $10.4 million and $8.4 million at September 30, 2023, and December 31, 2022, 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	9 Months Ended
	Sep. 30, 2023
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. U.S. Treasury notes have a readily determinable fair value, and accordingly, are classified within Level 1 of the fair value hierarchy. When quoted market prices are not available, the Company employs an independent pricing service that utilizes matrix pricing to calculate fair value. These fair value measurements consider observable data, such as dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayments speeds, credit information, and the respective terms and conditions for debt instruments. Management maintains procedures to monitor the pricing service's results and has a process in place to challenge their valuations and methodologies that appear unusual or unexpected. Government agency debentures, Municipal bonds and notes, Agency CMO, Agency MBS, Agency CMBS, CMBS, CLO, Corporate debt, Private label MBS, and Other 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 independent third parties. These derivative instruments are classified within Level 2 of the fair value hierarchy. Mortgage Banking Derivatives. The Company uses forward sales of mortgage loans and mortgage-backed securities to manage the risk of loss associated with its mortgage loan commitments and mortgage loans held for sale. Prior to closing and funding certain single-family residential mortgage loans, an interest rate lock commitment is generally extended to the borrower. During this in-between time period, the Company is subject to the risk that market interest rates may change. If rates rise, investors generally will pay less to purchase mortgage loans, which would result in a reduction in the gain on sale of the loans, or possibly a loss. In an effort to mitigate this risk, forward delivery sales commitments are established in which the Company agrees to either deliver whole mortgage loans to various investors or issue mortgage-backed securities. The fair value of mortgage banking derivatives is determined based on current market prices for similar assets in the secondary market. Accordingly, mortgage banking derivatives are classified within Level 2 of the fair value hierarchy. Originated Loans Held For Sale. The Company has elected to measure originated loans held for sale at fair value under the fair value option per ASC Topic 825, Financial Instruments. Electing to measure originated loans held for sale at fair value reduces certain timing differences and better reflects the price the Company would expect to receive from the sale of these loans. The fair value of originated loans held for sale is based on quoted market prices of similar loans sold in conjunction with securitization transactions. Accordingly, originated loans held for sale are classified within Level 2 of the fair value hierarchy. The following table compares the fair value to the unpaid principal balance of originated loans held for sale: At September 30, 2023 At December 31, 2022 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 837 $ 1,319 $ (482) $ 1,991 $ 1,631 $ 360 Rabbi Trust Investments. Investments held in each of the Company's Rabbi Trusts consist primarily of mutual funds that invest in equity and fixed income securities. Shares of these mutual funds are valued based on the NAV as reported by the trustee of the funds, which represents quoted prices in active markets. The Company has elected to measure the Rabbi Trusts' investments at fair value. Accordingly, the Rabbi Trusts' investments are classified within Level 1 of the fair value hierarchy. At September 30, 2023, and December 31, 2022, the total cost basis of the investments held in the Rabbi Trusts was $10.3 million and $10.0 million, respectively. Alternative Investments. Equity investments have a readily determinable fair value when unadjusted quoted prices are available in an active market for identical assets. Accordingly, these alternative investments are classified within Level 1 of the fair value hierarchy. At September 30, 2023, and December 31, 2022, equity investments with a readily determinable fair value had a total carrying amount of $0.9 million and $0.4 million, respectively, with no remaining unfunded commitment. During the three and nine months ended September 30, 2023, there were total write-ups in fair value of $0.3 million and $0.5 million, respectively, 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 September 30, 2023, and December 31, 2022, these alternative investments had a total carrying amount of $31.3 million and $89.2 million, respectively, and a remaining unfunded commitment of $29.9 million and $82.7 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 table summarizes the unobservable inputs used to derive the estimated fair value of the Company’s contingent consideration liabilities at September 30, 2023 (dollars in thousands): Agreement Maximum Amount Probability of Achievement Payment Term Discount Rate Fair Value (i) Re-sign broker dealers $ 4,826 99.0 % 2.13 6.40 % $ 4,231 (ii) Deposit program growth $ 12,500 100.0 % 1.25 6.40 % $ 11,568 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 September 30, 2023 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: U.S. Treasury notes $ 387,021 $ — $ — $ 387,021 Government agency debentures — 248,536 — 248,536 Municipal bonds and notes — 1,523,322 — 1,523,322 Agency CMO — 49,905 — 49,905 Agency MBS — 2,252,635 — 2,252,635 Agency CMBS — 1,755,131 — 1,755,131 CMBS — 786,602 — 786,602 Corporate debt — 601,582 — 601,582 Private label MBS — 39,878 — 39,878 Other — 8,779 — 8,779 Total available-for-sale securities 387,021 7,266,370 — 7,653,391 Gross derivative instruments, before netting (1) 713 472,896 — 473,609 Originated loans held for sale — 837 — 837 Investments held in Rabbi Trusts 12,837 — — 12,837 Alternative investments (2) 891 — — 32,206 Total financial assets $ 401,462 $ 7,740,103 $ — $ 8,172,880 Financial Liabilities: Gross derivative instruments, before netting (1) $ 64 $ 557,204 $ — $ 557,268 Contingent consideration — — 15,799 15,799 Total financial liabilities $ 64 $ 557,204 $ 15,799 $ 573,067 At December 31, 2022 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: U.S. Treasury notes $ 717,040 $ — $ — $ 717,040 Government agency debentures — 258,374 — 258,374 Municipal bonds and notes — 1,633,202 — 1,633,202 Agency CMO — 59,965 — 59,965 Agency MBS — 2,158,024 — 2,158,024 Agency CMBS — 1,406,486 — 1,406,486 CMBS — 896,640 — 896,640 CLO — 2,107 — 2,107 Corporate debt — 704,412 — 704,412 Private label MBS — 44,249 — 44,249 Other — 12,198 — 12,198 Total available-for-sale securities 717,040 7,175,657 — 7,892,697 Gross derivative instruments, before netting (1) 79 222,827 — 222,906 Originated loans held for sale — 1,991 — 1,991 Investments held in Rabbi Trusts 12,103 — — 12,103 Alternative investments (2) 430 — — 89,678 Total financial assets $ 729,652 $ 7,400,475 $ — $ 8,219,375 Financial Liabilities: Gross derivative instruments, before netting (1) $ 843 $ 413,656 $ — $ 414,499 (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 13: 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 September 30, 2023, and December 31, 2022, the carrying amount of these alternative investments was $50.0 million and $42.8 million, respectively, of which $4.8 million and $5.9 million, respectively, were considered to be measured at fair value. There were $0.9 million and $1.2 million in total write-ups due to observable price changes during the three and nine months ended September 30, 2023, respectively, and $1.0 million in write-downs due to impairment. 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 September 30, 2023, and December 31, 2022, there were $45.4 million and zero loans that were transferred to held for sale on the Condensed Consolidated Balance Sheet. 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 September 30, 2023, and December 31, 2022, the total book value of OREO and repossessed assets was $3.3 million and $2.3 million, respectively. In addition, the amortized cost of consumer loans secured by residential real estate property that were in process of foreclosure at September 30, 2023, was $16.3 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 that appear unusual or unexpected. 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 September 30, 2023 At December 31, 2022 (In thousands) Carrying Fair Carrying Fair Assets: Level 1 Cash and cash equivalents $ 2,172,731 $ 2,172,731 $ 839,943 $ 839,943 Level 2 Held-to-maturity investment securities 6,875,772 5,675,674 6,564,697 5,761,453 Level 3 Loans and leases, net 49,452,708 47,196,492 49,169,685 47,604,463 Mortgage servicing assets 8,519 24,822 9,515 27,043 Liabilities: Level 2 Deposit liabilities $ 52,844,248 $ 52,844,248 $ 49,893,391 $ 49,893,391 Time deposits 7,487,519 7,452,837 4,160,949 4,091,979 Securities sold under agreements to repurchase and other borrowings 157,491 157,474 1,151,830 1,151,797 FHLB advances 1,810,218 1,810,810 5,460,552 5,459,218 Long-term debt (1) 1,050,539 995,176 1,073,128 1,001,779

Retirement Benefit Plans

Retirement Benefit Plans	9 Months Ended
	Sep. 30, 2023
Retirement Benefits [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans Defined Benefit Pension and Other Postretirement Benefits The following tables summarize the components of net periodic benefit cost (income): Three months ended September 30, 2023 2022 (In thousands) Pension SERP OPEB Pension SERP OPEB Service cost $ — $ — $ 6 $ — $ — $ 9 Interest cost 2,164 48 263 1,441 17 194 Expected return on plan assets (3,435) — — (3,669) — — Amortization of actuarial loss (gain) 1,153 2 (676) 821 7 7 Net periodic benefit (income) cost $ (118) $ 50 $ (407) $ (1,407) $ 24 $ 210 Nine months ended September 30, 2023 2022 (In thousands) Pension SERP OPEB Pension SERP OPEB Service cost $ — $ — $ 20 $ — $ — $ 24 Interest cost 6,586 162 906 4,198 49 551 Expected return on plan assets (8,833) — — (11,006) — — Amortization of actuarial loss (gain) 3,585 5 (2,028) 1,667 20 (30) Net periodic benefit cost (income) $ 1,338 $ 167 $ (1,102) $ (5,141) $ 69 $ 545

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company's operations are organized into three reportable segments that represent its primary businesses: Commercial Banking, HSA Bank, and Consumer Banking. These segments reflect how executive management responsibilities are assigned, how discrete financial information is evaluated, the type of customer served, and how products and services are provided. Certain Treasury activities, including the operations of interLINK, along with the amounts required to reconcile profitability metrics to those reported in accordance with GAAP, are included in the Corporate and Reconciling category. In connection with the acquisition of interLINK on January 11, 2023, the $143.2 million of goodwill recorded was allocated entirely to Commercial Banking. In addition, as previously discussed in Note 2: Mergers and Acquisitions and 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. Changes in estimates and allocations that affect the results of any reportable segment do not affect the consolidated financial position or results of operations of the Company as a whole. The full profitability measurement reports, which are prepared for each reportable segment, reflect non-GAAP reporting methodologies. The differences between full profitability and GAAP results are reconciled in the Corporate and Reconciling category. The Company allocates interest income and interest expense to each business through an internal matched maturity FTP process. The goal of the FTP allocation is to encourage loan and deposit growth consistent with the Company’s overall profitability objectives. The FTP process considers the specific interest rate risk and liquidity risk of financial instruments and other assets and liabilities in each line of business. Loans are assigned an FTP rate for funds used and deposits are assigned an FTP rate for funds provided. The allocation considers the origination date and the earlier of the maturity date or the repricing date of a financial instrument to assign an FTP rate for loans and deposits originated each day. The FTP process transfers the corporate interest rate risk exposure to the Treasury function included within the Corporate and Reconciling category where such exposures are centrally managed. The Company allocates a majority of non-interest expense to each reportable segment using an activity and driver-based costing process. Costs, including shared services and back-office support areas, are analyzed, pooled by process, and assigned to the appropriate reportable segment. The combination of direct revenue, direct expenses, FTP, and allocations of non-interest expense produces PPNR, which is the basis the segments are reviewed by executive management. The Company also allocates the provision for credit losses to each reportable segment based on management's estimate of the expected loss content in each of the specific loan and lease portfolios. The ACL on loans and leases is included in total assets within the Corporate and Reconciling category. Business development expenses, such as merger-related and strategic initiatives costs, are also generally included in the Corporate and Reconciling category. The following tables present balance sheet information, including the appropriate allocations, for the Company's reportable segments and the Corporate and Reconciling category: At September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 2,029,204 $ 57,485 $ 544,776 $ — $ 2,631,465 Total assets 42,802,857 118,313 10,803,140 19,406,541 73,130,851 At December 31, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 1,904,291 $ 57,779 $ 552,034 $ — $ 2,514,104 Total assets 44,380,582 122,729 10,625,334 16,148,876 71,277,521 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 September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 391,386 $ 77,669 $ 195,315 $ (77,234) $ 587,136 Non-interest income 30,605 20,799 26,886 12,092 90,382 Non-interest expense 110,306 39,870 105,703 106,699 362,578 Pre-tax, pre-provision net revenue 311,685 58,598 116,498 (171,841) 314,940 Provision (benefit) for credit losses 39,477 — (3,638) 661 36,500 Income before income taxes 272,208 58,598 120,136 (172,502) 278,440 Income tax expense 68,324 15,822 31,716 (63,897) 51,965 Net income $ 203,884 $ 42,776 $ 88,420 $ (108,605) $ 226,475 Three months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 333,554 $ 58,567 $ 195,748 $ (36,866) $ 551,003 Non-interest income 40,497 25,842 33,842 13,455 113,636 Non-interest expense 102,415 36,725 109,588 81,343 330,071 Pre-tax, pre-provision net revenue 271,636 47,684 120,002 (104,754) 334,568 Provision (benefit) for credit losses 33,341 — (1,989) 5,179 36,531 Income before income taxes 238,295 47,684 121,991 (109,933) 298,037 Income tax expense 59,574 12,779 31,718 (40,002) 64,069 Net income $ 178,721 $ 34,905 $ 90,273 $ (69,931) $ 233,968 Nine months ended September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 1,159,306 $ 224,820 $ 610,353 $ (228,231) $ 1,766,248 Non-interest income 98,257 67,889 81,722 2,654 250,522 Non-interest expense 329,397 126,213 321,462 262,062 $ 1,039,134 Pre-tax, pre-provision net revenue 928,166 $ 166,496 370,613 (487,639) 977,636 Provision (benefit) for credit losses 109,994 — (1,085) 5,838 114,747 Income before income tax expense 818,172 166,496 371,698 (493,477) 862,889 Income tax expense 205,361 44,954 98,128 (168,001) 180,442 Net income $ 612,811 $ 121,542 $ 273,570 $ (325,476) $ 682,447 Nine months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 954,044 $ 152,702 $ 511,712 $ (186,547) $ 1,431,911 Non-interest income 128,670 79,352 92,541 38,041 338,604 Non-interest expense 294,375 110,674 312,464 330,570 1,048,083 Pre-tax, pre-provision net revenue 788,339 121,380 291,789 (479,076) 722,432 Provision (benefit) for credit losses 238,054 — (5,906) 5,471 237,619 Income before income tax expense 550,285 121,380 297,695 (484,547) 484,813 Income tax expense 133,966 32,530 77,352 (158,567) 85,281 Net income $ 416,319 $ 88,850 $ 220,343 $ (325,980) $ 399,532

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2023
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 16: Segment Reporting. Three months ended September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 5,056 $ 19,573 $ 15,251 $ 1,125 $ 41,005 Loan and lease related fees (1) 4,274 — — — 4,274 Wealth and investment services (2) 2,861 — 4,393 — 7,254 Other income — 1,226 3,541 1,092 5,859 Revenue from contracts with customers 12,191 20,799 23,185 2,217 58,392 Other sources of non-interest income 18,414 — 3,701 9,875 31,990 Total non-interest income $ 30,605 $ 20,799 $ 26,886 $ 12,092 $ 90,382 Three months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 7,573 $ 24,008 $ 18,728 $ 498 $ 50,807 Loan and lease related fees (1) 5,623 — — — 5,623 Wealth and investment services 2,672 — 8,756 (9) 11,419 Other income — 1,834 413 — 2,247 Revenue from contracts with customers 15,868 25,842 27,897 489 70,096 Other sources of non-interest income 24,629 — 5,945 12,966 43,540 Total non-interest income $ 40,497 $ 25,842 $ 33,842 $ 13,455 $ 113,636 Nine months ended September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 16,028 $ 62,651 $ 52,456 $ 724 $ 131,859 Loan and lease related fees (1) 13,024 — — — 13,024 Wealth and investment services (2) 8,501 — 12,746 (15) 21,232 Other income — 5,238 5,097 3,146 13,481 Revenue from contracts with customers 37,553 67,889 70,299 3,855 179,596 Other sources of non-interest income 60,704 — 11,423 (1,201) 70,926 Total non-interest income $ 98,257 $ 67,889 $ 81,722 $ 2,654 $ 250,522 Nine months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 21,905 $ 74,091 $ 53,057 $ 966 $ 150,019 Loan and lease related fees (1) 16,198 — — — 16,198 Wealth and investment services 8,576 — 24,706 (22) 33,260 Other income — 5,261 1,083 — 6,344 Revenue from contracts with customers 46,679 79,352 78,846 944 205,821 Other sources of non-interest income 81,991 — 13,695 37,097 132,783 Total non-interest income $ 128,670 $ 79,352 $ 92,541 $ 38,041 $ 338,604 (1) A portion of loan and lease related fees comprises income generated from factored receivables and payroll financing activities that is within the scope of ASC Topic 606. (2) Effective as of the fourth quarter of 2022, the wealth and investment services revenue stream was impacted by the restructuring of a process in which the Company offers brokerage, investment advisory, and certain insurance-related services to customers. The staff providing these services, who had previously been employees of the Bank, are now employees of a third-party service provider. As a result, the Company now recognizes income from this program on a net basis, which thereby reduces gross reported wealth and investment services non-interest income and the related compensation and benefits non-interest expense on the accompanying Condensed Consolidated Statements of Income. Contracts with customers did not generate significant contract assets and liabilities at September 30, 2023, or December 31, 2022. 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.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
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 September 30, At December 31, 2022 Commitments to extend credit $ 11,130,936 $ 11,237,496 Standby letters of credit 402,120 380,655 Commercial letters of credit 56,464 53,512 Total credit-related financial instruments with off-balance sheet risk $ 11,589,520 $ 11,671,663 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 September 30, 2023, and December 31, 2022, the ACL on unfunded loan commitments totaled $23.0 million and $27.7 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 May 22, 2023, the FDIC published a proposed rule to charge certain banks a special assessment to recover losses incurred by protecting uninsured depositors of Silicon Valley Bank and Signature Bank upon their failure in March 2023. The proposed rule would levy a special assessment to certain banks at an annual rate of 12.5 basis points based on their uninsured deposits balance as of December 31, 2022, payable in eight quarterly installments beginning in the first quarter of 2024. Based on the proposed rule, the Company estimates that its total special assessment charge would be approximately $44.0 million. The FDIC has the authority to make further changes to the proposed rule before finalization, including changes to the underlying data and calculation methodology used to determine the special assessment. The comment period on the proposed rule expired on July 21, 2023, and no final rule has been published in the Federal Register as of the date of this Quarterly Report on Form 10-Q. Accordingly, no legal obligation has been incurred, and therefore, no accrual has been recognized.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsThe 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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 226,475	$ 233,968	$ 682,447	$ 399,532

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
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)	9 Months Ended
	Sep. 30, 2023
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, 2022. The results of operations for the nine months ended September 30, 2023, 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.
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. 2022-02—Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU No. 2022-02, which eliminates the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Specifically, rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance in paragraphs 310-20-35-9 through 35-11 to determine whether a modification results in a new loan or a continuation of an existing loan. In addition, the Update requires that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost in the vintage disclosures required by paragraph 326-20-50-6. Modifications to borrowers experiencing financial difficulty include principal forgiveness, interest rate reductions, payment delays, term extensions, or combinations thereof. Expected losses or recoveries on loans where modifications have been granted to borrowers experiencing financial difficulty have been factored into the ACL on loans and leases. Upon adoption of ASU 2022-02, the Company is no longer required to use a discounted cash flow (or reconcilable) method to measure the ACL resulting from a modification with a borrower experiencing financial difficulty. Accordingly, the Company now applies the same credit loss methodology it uses for similar loans that were not modified. The Company adopted the Update on January 1, 2023. The Company elected the option to apply the modified retrospective transition method related to the recognition and measurement of TDRs, which resulted in a $5.9 million increase to the Allowance for credit losses on loans and leases and a $1.7 million decrease to DTAs, net, with a corresponding $4.2 million cumulative-effect adjustment to retained earnings as of the adoption date. The enhanced disclosure requirements provided for by the Update were adopted on a prospective basis. Reporting periods prior to the adoption of the Update are accounted for and presented in accordance with the applicable GAAP. Refer to Note 4: Loans and Leases for additional information regarding modifications granted to borrowers experiencing financial difficulty. ASU No. 2022-01—Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method In March 2022, the FASB issued ASU No. 2022-01—Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method, which expands the current last-of-layer method of hedge accounting that permits only one hedged layer to allow multiple hedged layers of a single closed portfolio. To reflect that expansion, the last-of-layer method is renamed the portfolio layer method. Additionally, the amendments in this Update: (i) expand the scope of the portfolio layer method to include non-prepayable assets; (ii) specify eligible hedging instruments in a single-layer hedge; (iii) provide additional guidance on the accounting for and disclosure of hedge basis adjustments; and (iv) specify how hedge basis adjustments should be considered when determining credit losses for the assets included in the closed portfolio. An entity may also reclassify debt securities classified in the held-to-maturity category at the date of adoption to the available-for-sale category only if the entity applies portfolio layer method hedging to one or more closed portfolios that include those debt securities within a 30-day period. The Company adopted the Update on January 1, 2023 on a prospective basis. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements. The Company did not reclassify any debt securities from the held-to-maturity category to the available-for-sale category as permitted upon adoption. ASU No. 2021-08—Business Combinations (Topic 805)—Accounting for Contract Assets and Contract Liabilities from Contracts with Customers In October 2021, the FASB issued ASU No. 2021-08—Business Combinations (Topic 805)—Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires that an acquirer recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606, Revenue from Contracts with Customers. At the acquisition date, an acquirer should account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The Company adopted the Update on January 1, 2023 on a prospective basis. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements. Relevant Accounting Standards Issued But Not Yet Adopted 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) 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 credit 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 Update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. The amendments generally must be applied on either a modified retrospective or retrospective basis with a cumulative-effect adjustment to retained earnings reflecting the difference between the previous method used to account for the tax equity investment and the application of the proportional amortization method since the investment was entered into. The adoption of this guidance is not expected to have a material impact on the Consolidated Financial Statements as the Company's 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 Update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. The amendments either may be applied prospectively to all new and existing leasehold improvements recognized on or after the adoption date with any remaining unamortized balance of existing leasehold improvements amortized over their remaining useful life to the common control group determined at that date; or retrospectively to the beginning of the period in which the entity first applied Topic 842, with any leasehold improvements that otherwise would not have been amortized or impaired recognized through a cumulative-effect adjustment to the opening balance of retained earnings at the beginning of the earliest period presented in accordance with Topic 842. The adoption of this guidance is not expected to have a material impact on the Consolidated Financial Statements as the Company's operating lease arrangements in which it is lessee are 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 Restrictions In June 2022, the FASB issued ASU No. 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions, which clarifies that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security, and therefore, is not considered in measuring fair value. The amendments also clarify that an entity cannot, as a separate unit of account, recognize and measure a contractual sale restriction, and 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 Update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years, with early adoption permitted. For all entities except investment companies, the amendments should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The adoption of this guidance is not expected to have a material impact on the Consolidated Financial Statements and disclosures. The Company does not currently consider contractual restrictions on the sale of an equity security in measuring fair value.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Summary of Purchase Price Allocation	The following table summarizes the allocation of the purchase price to the fair value of the identifiable assets acquired and liabilities assumed from Sterling as of January 31, 2022: (In thousands) Unpaid Principal Balance Fair Value Purchase price consideration $ 5,180,300 Assets: Cash and due from banks 510,929 Interest-bearing deposits 3,207 Investment securities available-for-sale 4,429,948 Federal Home Loan Bank and Federal Reserve Bank Stock 150,502 Loans held for sale 23,517 Loans and leases: Commercial non-mortgage $ 5,570,782 5,527,657 Asset-based 694,137 683,958 Commercial real estate 6,790,600 6,656,405 Multi-family 4,303,381 4,255,906 Equipment financing 1,350,579 1,314,311 Warehouse lending 647,767 643,754 Residential 1,313,785 1,281,637 Home equity 132,758 122,553 Other consumer 12,559 12,525 Total loans and leases $ 20,816,348 20,498,706 Deferred tax assets, net (59,716) Premises and equipment 264,421 Other intangible assets 210,100 Bank-owned life insurance policies 645,510 Accrued interest receivable and other assets 986,729 Total assets acquired $ 27,663,853 Liabilities: Non-interest-bearing deposits $ 6,620,248 Interest-bearing deposits 16,643,755 Securities sold under agreements to repurchase and other borrowings 27,184 Long-term debt 516,881 Accrued expenses and other liabilities 589,689 Total liabilities assumed $ 24,397,757 Net assets acquired 3,266,096 Goodwill $ 1,914,204
Summary of Supplemental Pro Forma Information Adjustments	The following table summarizes total merger-related expenses, which were primarily incurred in connection with the merger with Sterling: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Compensation and benefits (1) $ 9,583 $ 5,770 $ 27,370 $ 71,472 Occupancy (2) (79) 4,389 1,151 35,744 Technology and equipment (3) 9,652 1,478 14,780 21,375 Professional and outside services (4) 18,171 10,792 57,119 59,073 Marketing 1,574 64 2,535 199 Other expense (5) 22,724 3,043 28,883 12,808 Total merger-related expenses $ 61,625 $ 25,536 $ 131,838 $ 200,671 (1) Comprised primarily of severance and employee retention costs, and executive synergy stock awards. (2) Comprised primarily of charges associated with the Company's corporate real estate consolidation plan in 2022. (3) Comprised primarily of technology contract termination costs, and charges to support core conversion activities in 2023. (4) Comprised primarily of advisory, accounting, and other professional fees, and charges to support core conversion activities in 2023. The amount for the nine months ended September 30, 2023, includes a reduction of $1.7 million to a previously recorded contract termination charge during the three months ended March 31, 2023, due to a decrease in volume usage. (5) Comprised primarily of contract termination costs, disposals on property and equipment, and other miscellaneous expenses. The following tables summarize the change in accrued expenses and other liabilities as it relates to severance and contract termination costs, which were primarily incurred in connection with the merger with Sterling: Three months ended September 30, 2023 2022 (In thousands) Severance Contract Termination Total Severance Contract Termination Total Balance, beginning of period $ 3,169 $ 23,775 $ 26,944 $ 24,514 $ 17,704 $ 42,218 Additions charged to expense 3,557 14,000 17,557 840 — 840 Cash payments (971) (23,775) (24,746) (10,032) — (10,032) Other (166) — (166) (9) — (9) Balance, end of period $ 5,589 $ 14,000 $ 19,589 $ 15,313 $ 17,704 $ 33,017 Nine months ended September 30, 2023 2022 (In thousands) Severance Contract Termination Total Severance (1) Contract Termination Total Balance, beginning of period $ 7,583 $ 30,362 $ 37,945 $ 10,835 $ — $ 10,835 Additions charged to expense 11,741 14,000 25,741 35,619 17,704 53,323 Cash payments (12,509) (23,775) (36,284) (26,827) — (26,827) Other (1,226) (6,587) (7,813) (4,314) — (4,314) Balance, end of period $ 5,589 $ 14,000 $ 19,589 $ 15,313 $ 17,704 $ 33,017

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value U.S. Treasury notes $ 407,891 $ — $ (20,870) $ 387,021 Government agency debentures 302,164 — (53,628) 248,536 Municipal bonds and notes 1,646,582 2 (123,262) 1,523,322 Agency CMO 55,718 — (5,813) 49,905 Agency MBS 2,636,344 123 (383,832) 2,252,635 Agency CMBS 2,152,871 — (397,740) 1,755,131 CMBS 811,117 — (24,515) 786,602 Corporate debt 706,110 6 (104,534) 601,582 Private label MBS 46,921 — (7,043) 39,878 Other 9,823 — (1,044) 8,779 Total available-for-sale securities $ 8,775,541 $ 131 $ (1,122,281) $ 7,653,391 At December 31, 2022 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value U.S. Treasury notes $ 755,968 $ — $ (38,928) $ 717,040 Government agency debentures 302,018 — (43,644) 258,374 Municipal bonds and notes 1,719,110 5 (85,913) 1,633,202 Agency CMO 64,984 — (5,019) 59,965 Agency MBS 2,461,337 26 (303,339) 2,158,024 Agency CMBS 1,664,600 — (258,114) 1,406,486 CMBS 929,588 — (32,948) 896,640 CLO 2,108 — (1) 2,107 Corporate debt 795,999 — (91,587) 704,412 Private label MBS 48,895 — (4,646) 44,249 Other 12,548 — (350) 12,198 Total available-for-sale securities $ 8,757,155 $ 31 $ (864,489) $ 7,892,697 (1) Accrued interest receivable on available-for-sale securities of $42.5 million and $36.9 million at September 30, 2023, and December 31, 2022, 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 September 30, 2023 At December 31, 2022 Pledged for deposits $ 2,911,558 $ 2,573,072 Pledged for borrowings and other 3,991,253 1,195,101 Total available-for-sale securities pledged $ 6,902,811 $ 3,768,173
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 September 30, 2023 Less Than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ — $ — $ 387,021 $ (20,870) 14 $ 387,021 $ (20,870) Government agency debentures — — 248,536 (53,628) 19 248,536 (53,628) Municipal bonds and notes 34,562 (1,836) 1,484,023 (121,426) 416 1,518,585 (123,262) Agency CMO — — 49,905 (5,813) 36 49,905 (5,813) Agency MBS 339,979 (8,137) 1,883,669 (375,695) 477 2,223,648 (383,832) Agency CMBS 490,774 (39,102) 1,264,357 (358,638) 151 1,755,131 (397,740) CMBS 43,894 (1,004) 742,708 (23,511) 45 786,602 (24,515) Corporate debt — — 597,275 (104,534) 90 597,275 (104,534) Private label MBS — — 39,878 (7,043) 3 39,878 (7,043) Other — — 8,779 (1,044) 2 8,779 (1,044) Total $ 909,209 $ (50,079) $ 6,706,151 $ (1,072,202) 1,253 $ 7,615,360 $ (1,122,281) At December 31, 2022 Less Than Twelve Months Twelve Months or Longer Total (Dollars in thousands) Fair Unrealized Fair Unrealized Number of Fair Unrealized U.S. Treasury notes $ 337,563 $ (19,167) $ 379,477 $ (19,761) 23 $ 717,040 $ (38,928) Government agency debentures 258,374 (43,644) — — 19 258,374 (43,644) Municipal bonds and notes 1,616,771 (85,913) — — 444 1,616,771 (85,913) Agency CMO 55,693 (4,640) 4,272 (379) 39 59,965 (5,019) Agency MBS 1,641,544 (206,412) 515,206 (96,927) 460 2,156,750 (303,339) Agency CMBS 485,333 (68,674) 921,153 (189,440) 132 1,406,486 (258,114) CMBS 273,150 (8,982) 598,490 (23,966) 52 871,640 (32,948) CLO — — 2,107 (1) 1 2,107 (1) Corporate debt 692,990 (89,692) 8,421 (1,895) 105 701,411 (91,587) Private label MBS 44,249 (4,646) — — 3 44,249 (4,646) Other 12,198 (350) — — 4 12,198 (350) Total $ 5,417,865 $ (532,120) $ 2,429,126 $ (332,369) 1,282 $ 7,846,991 $ (864,489)
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 September 30, 2023 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 48,951 $ 47,286 After 1 year through 5 years 1,026,082 961,447 After 5 through 10 years 1,348,774 1,198,635 After 10 years 6,351,734 5,446,023 Total available-for-sale securities $ 8,775,541 $ 7,653,391 The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity: At September 30, 2023 (In thousands) Amortized Cost Fair Value Maturing within 1 year $ 8,334 $ 8,308 After 1 year through 5 years 57,037 56,361 After 5 through 10 years 363,281 333,255 After 10 years 6,447,323 5,277,750 Total held-to-maturity securities $ 6,875,975 $ 5,675,674
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 September 30, 2023 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 24,406 $ — $ (2,482) $ 21,924 $ — $ 24,406 Agency MBS 2,470,192 34 (428,971) 2,041,255 — 2,470,192 Agency CMBS 3,363,390 — (662,950) 2,700,440 — 3,363,390 Municipal bonds and notes 917,755 2 (96,878) 820,879 203 917,552 CMBS 100,232 — (9,056) 91,176 — 100,232 Total held-to-maturity securities $ 6,875,975 $ 36 $ (1,200,337) $ 5,675,674 $ 203 $ 6,875,772 At December 31, 2022 (In thousands) Amortized Cost (1) Unrealized Unrealized Fair Value Allowance Net Carrying Value Agency CMO $ 28,358 $ — $ (2,060) $ 26,298 $ — $ 28,358 Agency MBS 2,626,114 827 (339,592) 2,287,349 — 2,626,114 Agency CMBS 2,831,949 845 (407,648) 2,425,146 — 2,831,949 Municipal bonds and notes 928,845 1,098 (47,183) 882,760 182 928,663 CMBS 149,613 — (9,713) 139,900 — 149,613 Total held-to-maturity securities $ 6,564,879 $ 2,770 $ (806,196) $ 5,761,453 $ 182 $ 6,564,697 The following table summarizes the activity in the ACL on held-to-maturity securities: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Balance, beginning of period $ 216 $ 210 $ 182 $ 214 (Benefit) provision for credit losses (13) (1) 21 (5) Balance, end of period $ 203 $ 209 $ 203 $ 209 The following tables summarize the amortized cost of held-to-maturity securities based on their lowest publicly available credit rating: September 30, 2023 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Not Rated Agency CMO $ — $ 24,406 $ — $ — $ — $ — $ — $ — Agency MBS — 2,470,192 — — — — — — Agency CMBS — 3,363,390 — — — — — — Municipal bonds and notes 333,985 162,790 254,061 115,800 32,908 — 4,165 14,046 CMBS 100,232 — — — — — — — Total held-to-maturity securities $ 434,217 $ 6,020,778 $ 254,061 $ 115,800 $ 32,908 $ — $ 4,165 $ 14,046 December 31, 2022 Investment Grade (In thousands) Aaa Aa1 Aa2 Aa3 A1 A2 A3 Not Rated Agency CMO $ — $ 28,358 $ — $ — $ — $ — $ — $ — Agency MBS — 2,626,114 — — — — — — Agency CMBS — 2,831,949 — — — — — — Municipal bonds and notes 336,035 163,312 255,235 116,870 38,177 4,165 — 15,051 CMBS 149,613 — — — — — — — Total held-to-maturity securities $ 485,648 $ 5,649,733 $ 255,235 $ 116,870 $ 38,177 $ 4,165 $ — $ 15,051 The following table summarizes the carrying value of held-to-maturity securities pledged for deposits, borrowings, and other purposes: (In thousands) At September 30, 2023 At December 31, 2022 Pledged for deposits $ 1,623,674 $ 1,596,777 Pledged for borrowings and other 4,942,275 260,735 Total held-to-maturity securities pledged $ 6,565,949 $ 1,857,512

Loans and Leases (Tables)

Loans and Leases (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, At December 31, 2022 Commercial non-mortgage $ 16,508,188 $ 16,392,795 Asset-based 1,632,962 1,821,642 Commercial real estate 13,348,495 12,997,163 Multi-family 7,234,759 6,621,982 Equipment financing 1,431,858 1,628,393 Warehouse lending 118,478 641,976 Commercial portfolio 40,274,740 40,103,951 Residential 8,228,451 7,963,420 Home equity 1,533,046 1,633,107 Other consumer 51,909 63,948 Consumer portfolio 9,813,406 9,660,475 Loans and leases $ 50,088,146 $ 49,764,426 At September 30, 2023 (In thousands) Current 30-59 Days 60-89 Days 90+ Days Non-Accrual Total Commercial non-mortgage $ 51,613 $ — $ — $ — $ 53,833 $ 105,446 Asset-based 13,317 — — — 896 14,213 Commercial real estate 4,435 — — — 17,428 21,863 Equipment financing 1,362 — — — — 1,362 Residential 327 — — — 2,817 3,144 Home equity 240 — — — 566 806 Total $ 71,294 $ — $ — $ — $ 75,540 $ 146,834
Past Due Financing Receivables	The following tables summarize the aging of accrual and non-accrual loans and leases by class: At September 30, 2023 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current (1) Total Loans Commercial non-mortgage $ 4,209 $ 1,551 $ 138 $ 110,891 $ 116,789 $ 16,391,399 $ 16,508,188 Asset-based — — — 10,325 10,325 1,622,637 1,632,962 Commercial real estate 1,404 — — 25,376 26,780 13,321,715 13,348,495 Multi-family 2,103 155 — 5,726 7,984 7,226,775 7,234,759 Equipment financing 32,271 765 — 7,972 41,008 1,390,850 1,431,858 Warehouse lending — — — — — 118,478 118,478 Commercial portfolio 39,987 2,471 138 160,290 202,886 40,071,854 40,274,740 Residential 12,920 3,329 — 27,623 43,872 8,184,579 8,228,451 Home equity 8,145 3,372 — 26,042 37,559 1,495,487 1,533,046 Other consumer 451 119 — 110 680 51,229 51,909 Consumer portfolio 21,516 6,820 — 53,775 82,111 9,731,295 9,813,406 Total $ 61,503 $ 9,291 $ 138 $ 214,065 $ 284,997 $ 49,803,149 $ 50,088,146 At December 31, 2022 (In thousands) 30-59 Days 60-89 Days 90 or More Days Past Due Non-accrual Total Past Due and Non-accrual Current Total Loans Commercial non-mortgage $ 8,434 $ 821 $ 645 $ 71,884 $ 81,784 $ 16,311,011 $ 16,392,795 Asset-based 5,921 — — 20,024 25,945 1,795,697 1,821,642 Commercial real estate 1,494 23,492 68 39,057 64,111 12,933,052 12,997,163 Multi-family 1,157 — — 636 1,793 6,620,189 6,621,982 Equipment financing 806 9,988 — 12,344 23,138 1,605,255 1,628,393 Warehouse lending — — — — — 641,976 641,976 Commercial portfolio 17,812 34,301 713 143,945 196,771 39,907,180 40,103,951 Residential 8,246 3,083 — 25,424 36,753 7,926,667 7,963,420 Home equity 5,293 2,820 — 27,924 36,037 1,597,070 1,633,107 Other consumer 1,028 85 13 148 1,274 62,674 63,948 Consumer portfolio 14,567 5,988 13 53,496 74,064 9,586,411 9,660,475 Total $ 32,379 $ 40,289 $ 726 $ 197,441 $ 270,835 $ 49,493,591 $ 49,764,426
Financing Receivable, Nonaccrual	The following table provides additional information on non-accrual loans and leases: At September 30, 2023 At December 31, 2022 (In thousands) Non-accrual Non-accrual with No Allowance Non-accrual Non-accrual with No Allowance Commercial non-mortgage $ 110,891 $ 19,274 $ 71,884 $ 12,598 Asset-based 10,325 1,330 20,024 1,491 Commercial real estate 25,376 21,084 39,057 90 Multi-family 5,726 5,726 636 — Equipment financing 7,972 1,543 12,344 2,240 Commercial portfolio 160,290 48,957 143,945 16,419 Residential 27,623 11,440 25,424 10,442 Home equity 26,042 13,995 27,924 15,193 Other consumer 110 5 148 5 Consumer portfolio 53,775 25,440 53,496 25,640 Total $ 214,065 $ 74,397 $ 197,441 $ 42,059
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 September 30, 2023 2022 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 572,653 $ 56,258 $ 628,911 $ 511,745 $ 59,754 $ 571,499 Provision (benefit) 38,908 (3,069) 35,839 34,513 (3,161) 31,352 Charge-offs (27,360) (3,642) (31,002) (31,356) (1,453) (32,809) Recoveries 292 1,398 1,690 1,413 2,870 4,283 Balance, end of period $ 584,493 $ 50,945 $ 635,438 $ 516,315 $ 58,010 $ 574,325 At or for the nine months ended September 30, 2023 2022 (In thousands) Commercial Portfolio Consumer Portfolio Total Commercial Portfolio Consumer Portfolio Total ACL on loans and leases: Balance, beginning of period $ 533,125 $ 61,616 $ 594,741 $ 257,877 $ 43,310 $ 301,187 Adoption of ASU No. 2022-02 7,704 (1,831) 5,873 — — — Initial allowance for PCD loans and leases (1) — — — 78,376 9,669 88,045 Provision (benefit) 116,489 (7,580) 108,909 230,881 1,267 232,148 Charge-offs (75,715) (5,825) (81,540) (61,361) (3,469) (64,830) Recoveries 2,890 4,565 7,455 10,542 7,233 17,775 Balance, end of period $ 584,493 $ 50,945 $ 635,438 $ 516,315 $ 58,010 $ 574,325 Individually evaluated for credit losses 40,756 6,421 47,177 36,394 13,278 49,672 Collectively evaluated for credit losses $ 543,737 $ 44,524 $ 588,261 $ 479,921 $ 44,732 $ 524,653 (1) Represents the establishment of the initial reserve for PCD loans and leases, which is reported net of $48.3 million of day one charge-offs recognized at the date of acquisition in accordance with GAAP.
Financing Receivable Credit Quality Indicators	The following tables summarize the amortized cost basis of commercial loans and leases by Composite Credit Risk Profile grade and origination year: At September 30, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Risk rating: Pass $ 1,998,598 $ 4,377,097 $ 1,434,709 $ 765,133 $ 630,440 $ 981,671 $ 5,629,505 $ 15,817,153 Special mention 13,863 87,572 75,247 33,537 11,929 18,921 71,822 312,891 Substandard 49,664 114,769 25,383 35,778 44,531 19,772 88,247 378,144 Total commercial non-mortgage 2,062,125 4,579,438 1,535,339 834,448 686,900 1,020,364 5,789,574 16,508,188 Current period gross write-offs 324 2,007 647 511 241 3,782 — 7,512 Asset-based: Risk rating: Pass 11,188 1,223 — 1,374 7,776 43,633 1,395,893 1,461,087 Special mention — — — — — — 75,025 75,025 Substandard — 3,901 — — 1,330 896 90,723 96,850 Total asset-based 11,188 5,124 — 1,374 9,106 44,529 1,561,641 1,632,962 Current period gross write-offs — — — — 13,189 3,000 — 16,189 Commercial real estate: Risk rating: Pass 1,606,944 3,505,510 1,940,429 1,330,879 1,268,342 3,252,414 167,848 13,072,366 Special mention 825 957 8,044 31,549 23,593 51,125 1,204 117,297 Substandard 23,411 17,455 16,681 15,426 37,360 48,499 — 158,832 Total commercial real estate 1,631,180 3,523,922 1,965,154 1,377,854 1,329,295 3,352,038 169,052 13,348,495 Current period gross write-offs 2,590 — 2,574 3,813 2,754 36,575 — 48,306 Multi-family: Risk rating: Pass 1,214,619 1,913,835 1,020,778 419,684 609,830 1,996,593 1 7,175,340 Special mention — — — 9,251 359 36,135 — 45,745 Substandard — — — 368 — 13,306 — 13,674 Total multi-family 1,214,619 1,913,835 1,020,778 429,303 610,189 2,046,034 1 7,234,759 Current period gross write-offs — — — — — 1,033 — 1,033 Equipment financing: Risk rating: Pass 270,568 321,562 268,145 214,395 211,682 76,550 — 1,362,902 Special mention — 1,436 1,589 — 10,642 6,850 — 20,517 Substandard — 5,887 7,020 9,347 13,727 12,458 — 48,439 Total equipment financing 270,568 328,885 276,754 223,742 236,051 95,858 — 1,431,858 Current period gross write-offs — — — 2,634 — 41 — 2,675 Warehouse lending: Risk rating: Pass — — — — — — 118,478 118,478 Total warehouse lending — — — — — — 118,478 118,478 Current period gross write-offs — — — — — — — — Total commercial portfolio $ 5,189,680 $ 10,351,204 $ 4,798,025 $ 2,866,721 $ 2,871,541 $ 6,558,823 $ 7,638,746 $ 40,274,740 Current period gross write-offs $ 2,914 $ 2,007 $ 3,221 $ 6,958 $ 16,184 $ 44,431 $ — $ 75,715 At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Commercial non-mortgage: Pass $ 5,154,781 $ 1,952,158 $ 965,975 $ 792,977 $ 593,460 $ 780,200 $ 5,670,532 $ 15,910,083 Special mention 104,277 15,598 21,168 263 14,370 7,770 40,142 203,588 Substandard 28,203 11,704 69,954 36,604 70,634 16,852 41,917 275,868 Doubtful — — — 1 — — 3,255 3,256 Total commercial non-mortgage 5,287,261 1,979,460 1,057,097 829,845 678,464 804,822 5,755,846 16,392,795 Asset-based: Pass 19,659 3,901 9,424 14,413 5,163 55,553 1,551,250 1,659,363 Special mention — — — — — — 80,476 80,476 Substandard — — — 1,491 — — 80,312 81,803 Total asset-based 19,659 3,901 9,424 15,904 5,163 55,553 1,712,038 1,821,642 Commercial real estate: Pass 3,420,635 2,246,672 1,556,185 1,605,869 1,058,730 2,681,052 97,832 12,666,975 Special mention 21,878 8,995 7,264 37,570 47,419 66,652 1,000 190,778 Substandard 519 2,459 216 31,163 47,021 57,997 — 139,375 Doubtful — — — 1 — 34 — 35 Total commercial real estate 3,443,032 2,258,126 1,563,665 1,674,603 1,153,170 2,805,735 98,832 12,997,163 Multi-family: Pass 1,992,980 1,057,705 507,065 694,066 444,564 1,748,337 51,655 6,496,372 Special mention 37,677 — — 95 40,307 726 8,838 87,643 Substandard — — 382 — 12,681 24,904 — 37,967 Total multi-family 2,030,657 1,057,705 507,447 694,161 497,552 1,773,967 60,493 6,621,982 Equipment financing: Pass 388,641 345,792 331,419 308,441 98,874 83,264 — 1,556,431 Special mention — 185 — 11,965 6,775 25 — 18,950 Substandard 314 16,711 18,436 5,016 5,307 7,228 — 53,012 Total equipment financing 388,955 362,688 349,855 325,422 110,956 90,517 — 1,628,393 Warehouse lending: Pass — — — — — — 641,976 641,976 Total warehouse lending — — — — — — 641,976 641,976 Total commercial portfolio $ 11,169,564 $ 5,661,880 $ 3,487,488 $ 3,539,935 $ 2,445,305 $ 5,530,594 $ 8,269,185 $ 40,103,951 The following tables summarize the amortized cost basis of consumer loans by FICO score and origination year: At September 30, 2023 (In thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Total Residential: Risk rating: 800+ $ 146,015 $ 783,183 $ 1,080,117 $ 439,900 $ 152,423 $ 927,801 $ — $ 3,529,439 740-799 320,705 774,244 788,042 303,391 106,743 683,795 — 2,976,920 670-739 128,325 307,265 304,316 95,158 48,146 336,117 — 1,219,327 580-669 11,714 48,750 50,865 14,916 11,133 122,544 — 259,922 579 and below 1,322 51,996 8,697 189 116,917 63,722 — 242,843 Total residential 608,081 1,965,438 2,232,037 853,554 435,362 2,133,979 — 8,228,451 Current period gross write-offs — — 3 — — 348 — 351 Home equity: Risk rating: 800+ 20,653 27,163 34,930 25,418 7,914 59,074 409,133 584,285 740-799 20,009 22,878 31,037 15,529 5,887 35,482 351,533 482,355 670-739 13,299 15,757 14,689 5,940 3,418 31,292 250,737 335,132 580-669 2,083 3,261 1,875 1,281 1,266 11,419 66,901 88,086 579 and below 544 787 909 895 556 5,909 33,588 43,188 Total home equity 56,588 69,846 83,440 49,063 19,041 143,176 1,111,892 1,533,046 Current period gross write-offs — 3 81 — — 2,312 — 2,396 Other consumer: Risk rating: 800+ 345 434 1,968 336 509 134 21,869 25,595 740-799 1,172 709 565 838 1,102 447 4,144 8,977 670-739 406 588 383 1,143 1,826 154 9,644 14,144 580-669 55 143 123 246 461 67 1,203 2,298 579 and below 59 91 54 11 43 30 607 895 Total other consumer 2,037 1,965 3,093 2,574 3,941 832 37,467 51,909 Current period gross write-offs 2,354 7 3 203 286 225 — 3,078 Total consumer portfolio $ 666,706 $ 2,037,249 $ 2,318,570 $ 905,191 $ 458,344 $ 2,277,987 $ 1,149,359 $ 9,813,406 Current period gross write-offs $ 2,354 $ 10 $ 87 $ 203 $ 286 $ 2,885 $ — $ 5,825 At December 31, 2022 (In thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Amortized Cost Basis Total Residential: 800+ $ 527,408 $ 954,568 $ 469,518 $ 160,596 $ 28,361 $ 997,409 $ — $ 3,137,860 740-799 963,026 946,339 311,295 111,913 43,684 689,771 — 3,066,028 670-739 381,515 350,671 103,999 62,365 18,451 384,687 — 1,301,688 580-669 40,959 49,648 14,484 5,836 2,357 138,107 — 251,391 579 and below 52,464 3,693 2,057 84,032 1,299 62,908 — 206,453 Total residential 1,965,372 2,304,919 901,353 424,742 94,152 2,272,882 — 7,963,420 Home equity: 800+ 25,475 35,129 25,612 7,578 12,545 55,352 465,318 627,009 740-799 26,743 35,178 17,621 8,111 7,765 32,270 398,692 526,380 670-739 18,396 16,679 8,175 3,635 7,614 30,060 259,646 344,205 580-669 2,848 3,068 1,520 1,456 1,163 13,607 76,614 100,276 579 and below 426 386 651 661 563 4,736 27,814 35,237 Total home equity 73,888 90,440 53,579 21,441 29,650 136,025 1,228,084 1,633,107 Other consumer: 800+ 495 218 544 1,045 247 56 19,196 21,801 740-799 888 2,624 1,959 2,494 941 364 12,218 21,488 670-739 977 603 2,480 4,238 1,041 118 6,107 15,564 580-669 211 117 337 801 173 54 2,223 3,916 579 and below 169 101 29 116 36 21 707 1,179 Total other consumer 2,740 3,663 5,349 8,694 2,438 613 40,451 63,948 Total consumer portfolio $ 2,042,000 $ 2,399,022 $ 960,281 $ 454,877 $ 126,240 $ 2,409,520 $ 1,268,535 $ 9,660,475
Troubled Debt Restructurings on Financing Receivables	The following table summarizes the amortized cost basis at September 30, 2023, of loans modified to borrowers experiencing financial difficulty, disaggregated by class and type of concession granted: For the three months ended September 30, 2023 (In thousands) Interest Rate Reduction Term Extension Payment Delay Combination Term Extension and Interest Rate Reduction Combination Term Extension and Payment Delay Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness Total % of Total Class (2) Commercial non-mortgage $ — $ 26,970 $ — $ 940 $ 17,798 $ — $ 45,708 0.3 % Asset-based — 13,317 — — — 896 14,213 0.9 Commercial real estate — 768 — 17,247 506 — 18,521 0.1 Residential 257 138 — — — — 395 — Home equity 118 — 4 308 — — 430 — Total (1) $ 375 $ 41,193 $ 4 $ 18,495 $ 18,304 $ 896 $ 79,267 0.2 % For the nine months ended September 30, 2023 (In thousands) Interest Rate Reduction Term Extension Payment Delay Combination Term Extension and Interest Rate Reduction Combination Term Extension and Payment Delay Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness Total % of Total Class (2) Commercial non-mortgage $ — $ 65,470 $ 9,409 $ 1,253 $ 29,314 $ — $ 105,446 0.6 % Asset-based — 13,317 — — — 896 14,213 0.9 Commercial real estate — 3,928 182 17,247 506 — 21,863 0.2 Equipment financing — — 1,362 — — — 1,362 0.1 Residential 257 1,287 1,600 — — — 3,144 — Home equity 181 105 4 516 — — 806 0.1 Total (1) $ 438 $ 84,107 $ 12,557 $ 19,016 $ 29,820 $ 896 $ 146,834 0.3 % (1) The total amortized cost excludes accrued interest receivable of $0.2 million and $0.3 million for the three and nine months ended September 30, 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 table describes the financial effect of the modifications made to borrowers experiencing financial difficulty: For the three months ended September 30, 2023 Financial Effect Interest Rate Reduction: Residential Reduced weighted average interest rate by 2.3% Home equity Reduced weighted average interest rate by 0.3% Term Extension: Commercial non-mortgage Extended term by a weighted average of 1.3 years Asset-based Extended term by a weighted average of 0.4 years Commercial real estate Extended term by a weighted average of 0.8 years Residential Extended term by a weighted average of 4.9 years Payment Delay: Home equity Provided partial payment deferrals for a weighted average of 0.4 years Combination Term Extension and Interest Rate Reduction: Commercial non-mortgage Extended term by a weighted average of 0.6 years and reduced weighted average interest rate by 2.0% Commercial real estate Extended term by a weighted average of 3.0 years and reduced weighted average interest rate by 2.4% Home equity Extended term by a weighted average of 19.6 years and reduced weighted average interest rate by 2.5% Combination Term Extension and Payment Delay: Commercial non-mortgage Extended term by a weighted average of 1.2 years and provided partial payment deferrals for a weighted average of 2.0 years Commercial real estate Extended term by a weighted average of 0.5 years and provided payment deferrals for a weighted average of 0.5 years Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness: Asset-based Extended term by a weighted average of 4.6 years, reduced weighted average interest rate by 10.8%, and provided 1/3 principal forgiveness contingent upon payment For the nine months ended September 30, 2023 Financial Effect Interest Rate Reduction: Residential Reduced weighted average interest rate by 2.3% Home equity Reduced weighted average interest rate by 0.3% Term Extension: Commercial non-mortgage Extended term by a weighted average of 1.1 years Asset-based Extended term by a weighted average of 0.4 years Commercial real estate Extended term by a weighted average of 1.9 years Residential Extended term by a weighted average of 1.8 years Home equity Extended term by a weighted average of 11.5 years Payment Delay: Commercial non-mortgage Provided partial payment deferrals for a weighted average of 0.5 years Commercial real estate Provided payment deferrals for a weighted average of 0.3 years to be received at contractual maturity Equipment financing Provided partial payment deferrals for a weighted average of 0.5 years Residential Provided payment deferrals for a weighted average of 1.0 year Home equity Provided partial payment deferrals for a weighted average of 0.4 years Combination Term Extension and Rate Reduction: Commercial non-mortgage Extended term by a weighted average of 1.4 years and reduced weighted average interest rate by 1.8% Commercial real estate Extended term by a weighted average of 3.0 years and reduced weighted average interest rate by 2.4% Home equity Extended term by a weighted average of 16.8 years and reduced weighted average interest rate by 2.1% Combination Term Extension and Payment Delay: Commercial non-mortgage Extended term by a weighted average of 1.1 years and provided partial payment deferrals for a weighted average of 1.9 years Commercial real estate Extended term by a weighted average of 0.5 years and provided payment deferrals for a weighted average of 0.5 years Combination Term Extension, Interest Rate Reduction, and Principal Forgiveness: Asset-based Extended term by a weighted average of 4.6 years, reduced weighted average interest rate by 10.8%, and provided 1/3 principal forgiveness contingent upon payment The following table summarizes information related to TDRs: (In thousands) At December 31, 2022 Accrual status $ 110,868 Non-accrual status 83,954 Total TDRs $ 194,822 Additional funds committed to borrowers in TDR status $ 1,724 Specific reserves for TDRs included in the ACL on loans and leases: Commercial portfolio $ 14,578 Consumer portfolio 3,559 The following table summarizes loans and leases modified as TDRs by class and modification type during the three and nine months ended September 30, 2022: Three months ended September 30, 2022 Nine months ended September 30, 2022 (Dollars in thousands) Number of Recorded Investment (1) Number of Recorded Investment (1) Commercial non-mortgage Term extension 1 $ 24 3 $ 121 Combination - Term extension and interest rate reduction 3 322 8 765 Other (2) 15 17,408 16 40,372 Equipment financing Other (2) — — 1 1,157 Residential Extended maturity — — 1 893 Maturity/rate combined 1 124 1 124 Other (2) 1 298 7 3,060 Home equity Adjusted interest rate — — 1 74 Combination - Term extension and interest rate reduction 3 1,515 14 2,239 Other (2) 6 444 30 1,777 Total TDRs 30 $ 20,135 82 $ 50,582 (1) Post-modification balances approximated pre-modification balances. The aggregate amount of charge-offs due to restructurings was not significant. (2) Other included covenant modifications, forbearance, discharges under Chapter 7 bankruptcy, or other concessions.

Transfers and Servicing of Fi_2

Transfers and Servicing of Financial Assets (Tables)	9 Months Ended
	Sep. 30, 2023
Transfers and Servicing [Abstract]
Transfer of Financial Assets Accounted for as Sales	The following table summarizes information related to mortgage banking activities: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Net gain on sale $ 51 $ 26 $ 219 $ 529 Origination fees 7 22 52 194 Fair value adjustment (16) 38 (41) (107) Mortgage banking activities $ 42 $ 86 $ 230 $ 616 Proceeds from sale $ 2,590 $ 1,053 $ 11,250 $ 33,886 Loans sold with servicing rights retained 633 147 5,981 30,464
Servicing Asset at Amortized Cost	The following table presents the change in the carrying amount for mortgage servicing rights: Three months ended September 30, Nine months ended September 30, (In thousands) 2023 2022 2023 2022 Balance, beginning of period $ 8,858 $ 8,592 $ 9,515 $ 9,237 Acquired from Sterling — — — 859 Additions 13 1,627 65 1,892 Amortization (352) (382) (1,061) (2,151) Balance, end of period $ 8,519 $ 9,837 $ 8,519 $ 9,837

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table summarizes changes in the carrying amount of goodwill: (In thousands) At September 30, At December 31, Balance, beginning of period $ 2,514,104 $ 538,373 interLINK acquisition 143,216 — Sterling merger (1) (25,561) 1,939,765 Bend acquisition (1) (294) 35,966 Balance, end of period $ 2,631,465 $ 2,514,104 (1) The 2023 changes reflect adjustments recorded within the one-year measurement period, which were identified in the first quarter as a result of extended information gathering and new information that arose from integration activities. The allocation of the purchase price and goodwill calculations for both the Sterling merger and Bend acquisition were final as of March 31, 2023.
Schedule of Finite-Lived Intangible Assets	The following table summarizes other intangible assets: At September 30, 2023 At December 31, 2022 (In thousands) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposits $ 146,037 $ 49,871 $ 96,166 $ 146,037 $ 36,710 $ 109,327 Customer relationships (1) 151,000 38,814 112,186 115,000 24,985 90,015 Non-competition agreement (1) 4,000 600 3,400 — — — Total other intangible assets $ 301,037 $ 89,285 $ 211,752 $ 261,037 $ 61,695 $ 199,342 (1) The increase in the gross carrying amount is attributed to the acquisition of interLINK during the first quarter of 2023, in which the Company identified and recorded a $36.0 million intangible asset for broker dealer relationships, which is being amortized on an accelerated basis over an estimated useful life of 10 years, and a $4.0 million non-competition agreement, which is being amortized on a straight-line basis over an estimated useful life of 5 years.
Schedule Of Future Amortization expense	The remaining estimated aggregate future amortization expense for other intangible assets is as follows: (In thousands) At September 30, Remainder of 2023 $ 8,617 2024 29,618 2025 25,956 2026 25,565 2027 25,565 Thereafter 96,431

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2023
Deposit Liabilities [Abstract]
Deposit Liabilities, Type	The following table summarizes deposits by type: (In thousands) At September 30, At December 31, Non-interest-bearing: Demand $ 11,410,063 $ 12,974,975 Interest-bearing: Health savings accounts 8,229,889 7,944,892 Checking 8,826,265 9,237,529 Money market 17,755,198 11,062,652 Savings 6,622,833 8,673,343 Time deposits 7,487,519 4,160,949 Total interest-bearing $ 48,921,704 $ 41,079,365 Total deposits $ 60,331,767 $ 54,054,340 Time deposits, money market, and interest-bearing checking obtained through brokers (1) $ 3,050,332 $ 1,964,873 Aggregate amount of time deposit accounts that exceeded the FDIC limit 3,467,080 1,894,950 Demand deposit overdrafts reclassified as loan balances 9,867 8,721 (1) Excludes $5.2 billion of money market sweep deposits received through interLINK at September 30, 2023.
Time Deposit Maturities	The following table summarizes the scheduled maturities of time deposits: (In thousands) At September 30, Remainder of 2023 $ 3,454,002 2024 3,790,109 2025 137,311 2026 54,969 2027 34,419 Thereafter 16,709 Total time deposits $ 7,487,519

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements	The following table summarizes securities sold under agreements to repurchase and other borrowings: At September 30, 2023 At December 31, 2022 (Dollars in thousands) Total Outstanding Rate Total Outstanding Rate Securities sold under agreements to repurchase (1) $ 157,491 0.12 % $ 282,005 0.11 % Federal funds purchased — — 869,825 4.44 Securities sold under agreements to repurchase and other borrowings $ 157,491 0.12 % $ 1,151,830 3.38 % (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 September 30, 2023 At December 31, 2022 (Dollars in thousands) Total Outstanding Weighted- Total Outstanding Weighted- Maturing within 1 year $ 1,800,113 5.55 % $ 5,450,187 4.40 % After 1 but within 2 years — — — — After 2 but within 3 years — — — — After 3 but within 4 years — — — — After 4 but within 5 years 471 1.35 252 — After 5 years 9,634 2.07 10,113 2.09 Total FHLB advances $ 1,810,218 5.53 % $ 5,460,552 4.39 % Aggregate carrying value of assets pledged as collateral $ 20,943,861 $ 13,692,379 Remaining borrowing capacity at FHLB 13,380,838 4,291,326
Schedule of Long-term Debt Instruments	The following table summarizes long-term debt: (Dollars in thousands) At September 30, At December 31, 4.375% Senior fixed-rate notes due February 15, 2024 (2) $ 132,550 $ 150,000 4.100% Senior fixed-rate notes due March 25, 2029 (3) 329,443 333,458 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 (4) 77,320 77,320 Total senior and subordinated debt 1,038,313 1,059,778 Discount on senior fixed-rate notes (592) (756) Debt issuance cost on senior fixed-rate notes (1,516) (1,824) Premium on subordinated fixed-to-floating rate notes 14,334 15,930 Long-term debt (1) $ 1,050,539 $ 1,073,128 (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 repurchased and retired $17.5 million of these senior notes at 96 cents on the dollar in May 2023. The resulting (3) The Company de-designated its fair value hedging relationship on these senior notes in 2020. A basis adjustment of $29.4 million and $33.5 million at September 30, 2023, and December 31, 2022, respectively, is included in the carrying value and is being amortized over the remaining life of the senior notes. (4) The interest rate on the Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month SOFR (previously

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income, Net of Tax (Tables)	9 Months Ended
	Sep. 30, 2023
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) income, net of tax: Three months ended September 30, 2023 Nine months ended September 30, 2023 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (644,579) $ (35,023) $ (39,221) $ (718,823) $ (631,160) $ (8,874) $ (44,926) $ (684,960) Other comprehensive (loss) income before reclassifications (174,594) (23,132) — (197,726) (203,031) (50,473) 3,553 (249,951) Amounts reclassified from accumulated other comprehensive (loss) — 421 349 770 15,018 1,613 2,501 19,132 Other comprehensive (loss) income, net of tax (174,594) (22,711) 349 (196,956) (188,013) (48,860) 6,054 (230,819) Balance, end of period $ (819,173) $ (57,734) $ (38,872) $ (915,779) $ (819,173) $ (57,734) $ (38,872) $ (915,779) Three months ended September 30, 2022 Nine months ended September 30, 2022 (In thousands) Securities Available For Sale Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Securities Available Derivative Instruments Defined Benefit Pension and Other Postretirement Benefit Plans Total Balance, beginning of period $ (445,616) $ (2,082) $ (33,634) $ (481,332) $ 4,536 $ 6,070 $ (33,186) $ (22,580) Other comprehensive (loss) (243,872) (14,416) (248) (258,536) (694,024) (24,099) (1,295) (719,418) Amounts reclassified from accumulated other comprehensive (loss) 1,641 717 609 2,967 1,641 2,248 1,208 5,097 Other comprehensive (loss) income, net of tax (242,231) (13,699) 361 (255,569) (692,383) (21,851) (87) (714,321) Balance, end of period $ (687,847) $ (15,781) $ (33,273) $ (736,901) $ (687,847) $ (15,781) $ (33,273) $ (736,901)
Schedule of Accumulated Other Comprehensive Loss	The following table further summarizes the amounts reclassified from accumulated other comprehensive (loss) income: Accumulated Other Comprehensive Three months ended Nine months ended Associated Line Item on the September 30, September 30, 2023 2022 2023 2022 (In thousands) Investment securities available-for-sale: Net holding (losses) $ — $ (2,234) $ (20,531) $ (2,234) (Loss) on sale of investment securities Tax benefit — 593 5,513 593 Income tax expense Net of tax $ — $ (1,641) $ (15,018) $ (1,641) Derivative instruments: Hedge terminations $ (67) $ (76) $ (242) $ (229) Interest expense Premium amortization (510) (909) (1,970) (2,856) Interest income Tax benefit 156 268 599 837 Income tax expense Net of tax $ (421) $ (717) $ (1,613) $ (2,248) Defined benefit pension and other postretirement benefit plans: Actuarial net loss amortization $ (479) $ (835) $ (1,562) $ (1,657) Other expense Other — — (1,869) — Other expense Tax benefit 130 226 930 449 Income tax expense Net of tax $ (349) $ (609) $ (2,501) $ (1,208)

Regulatory Capital and Restri_2

Regulatory Capital and Restrictions (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 6,048,469 11.12 % $ 2,447,347 4.5 % $ 3,535,056 6.5 % Total risk-based capital 7,497,339 13.79 4,350,838 8.0 5,438,548 10.0 Tier 1 risk-based capital 6,332,448 11.64 3,263,129 6.0 4,350,838 8.0 Tier 1 leverage capital 6,332,448 8.83 2,869,002 4.0 3,586,253 5.0 Webster Bank CET1 risk-based capital $ 6,790,765 12.51 % $ 2,443,048 4.5 % $ 3,528,848 6.5 % Total risk-based capital 7,365,002 13.57 4,343,197 8.0 5,428,997 10.0 Tier 1 risk-based capital 6,790,765 12.51 3,257,398 6.0 4,343,197 8.0 Tier 1 leverage capital 6,790,765 9.48 2,866,587 4.0 3,583,234 5.0 At December 31, 2022 Actual (1) Minimum Requirement Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Webster Financial Corporation CET1 risk-based capital $ 5,822,369 10.71 % $ 2,446,344 4.5 % $ 3,533,608 6.5 % Total risk-based capital 7,203,029 13.25 4,349,056 8.0 5,436,320 10.0 Tier 1 risk-based capital 6,106,348 11.23 3,261,792 6.0 4,349,056 8.0 Tier 1 leverage capital 6,106,348 8.95 2,730,212 4.0 3,412,765 5.0 Webster Bank CET1 risk-based capital $ 6,661,504 12.28 % $ 2,442,058 4.5 % $ 3,527,417 6.5 % Total risk-based capital 7,165,935 13.20 4,341,437 8.0 5,426,796 10.0 Tier 1 risk-based capital 6,661,504 12.28 3,256,078 6.0 4,341,437 8.0 Tier 1 leverage capital 6,661,504 9.77 2,727,476 4.0 3,409,345 5.0 (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)	9 Months Ended
	Sep. 30, 2023
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) September 30, 2023 December 31, 2022 Gross investment in LIHTC investments $ 921,100 $ 797,453 Accumulated amortization (123,708) (69,424) Net investment in LIHTC investments $ 797,392 $ 728,029 Unfunded commitments for LIHTC investments $ 391,896 $ 335,959

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, Nine months ended September 30, (In thousands, except per share data) 2023 2022 2023 2022 Net income $ 226,475 $ 233,968 $ 682,447 $ 399,532 Less: Preferred stock dividends 4,162 4,162 12,487 11,756 Net income available to common stockholders 222,313 229,806 669,960 387,776 Less: Earnings allocated to participating securities 2,146 2,128 6,211 3,562 Earnings applicable to common stockholders $ 220,167 $ 227,678 $ 663,749 $ 384,214 Weighted-average common shares outstanding - basic 171,210 173,868 172,233 165,743 Add: Effect of dilutive stock options and restricted stock 140 76 93 70 Weighted-average common shares outstanding - diluted 171,350 173,944 172,326 165,813 Basic earnings per common share $ 1.29 $ 1.31 $ 3.85 $ 2.32 Diluted earnings per common share 1.28 1.31 3.85 2.32

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 450,000 $ 8 $ 5,400,000 $ 77,384 Not designated as hedging instruments: Interest rate derivatives (1) 7,580,155 472,844 7,546,167 479,766 Mortgage banking derivatives (2) 1,113 8 — — Other (3) 264,524 749 684,520 118 Total not designated as hedging instruments 7,845,792 473,601 8,230,687 479,884 Gross derivative instruments, before netting $ 8,295,792 473,609 $ 13,630,687 557,268 Less: Master netting agreements 78,044 78,044 Cash collateral 392,408 — Total derivative instruments, after netting $ 3,157 $ 479,224 At December 31, 2022 Asset Derivatives Liability Derivatives (In thousands) Notional Amounts Fair Value Notional Amounts Fair Value Designated as hedging instruments: Interest rate derivatives (1) $ 1,350,000 $ 1,515 $ 1,750,000 $ 9,632 Not designated as hedging instruments: Interest rate derivatives (1) 7,024,507 221,225 7,022,844 403,952 Mortgage banking derivatives (2) 3,283 32 — — Other (3) 161,934 134 606,478 915 Total not designated as hedging instruments 7,189,724 221,391 7,629,322 404,867 Gross derivative instruments, before netting $ 8,539,724 222,906 $ 9,379,322 414,499 Less: Master netting agreements 16,129 16,129 Cash collateral 184,095 — Total derivative instruments, after netting $ 22,682 $ 398,370 (1) Balances related to clearing houses are presented as a single unit of account. In accordance with their rule books, clearing houses legally characterize variation margin payments as settlement of derivatives rather than collateral against derivative positions. At September 30, 2023, and December 31, 2022, notional amounts of interest rate swaps cleared through clearing houses include $0.1 billion and $2.7 billion for asset derivatives, respectively, and $0.4 billion and zero for liability derivatives, respectively. The related fair values approximate zero. (2) Notional amounts related to residential loans exclude approved floating rate commitments of $2.2 million and $2.4 million at September 30, 2023, and December 31, 2022, 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 include $206.4 million and $125.6 million for asset derivatives and $667.6 million and $559.2 million for liability derivatives at September 30, 2023, and December 31, 2022, respectively, which have insignificant related fair values.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following tables present fair value positions transitioned from gross to net upon applying counterparty netting agreements: At September 30, 2023 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Pledged Net Amount Presented Amounts Not Offset Asset derivatives $ 472,969 $ 78,044 $ 392,408 $ 2,517 $ 2,538 Liability derivatives 78,044 78,044 — — 6,442 At December 31, 2022 (In thousands) Gross Amount Recognized Derivative Offset Amount Cash Collateral Received/Pledged Net Amount Presented Amounts Not Offset Asset derivatives $ 217,246 $ 16,129 $ 184,095 $ 17,022 $ 17,392 Liability derivatives 16,129 16,129 — — 1,545
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 September 30, Nine months ended September 30, (In thousands) Net Interest Income 2023 2022 2023 2022 Fair value hedges: Interest rate derivatives Deposits interest expense $ 7,393 $ — $ 8,086 $ — Hedged item Deposits interest expense (6,145) — (5,870) — Net recognized on fair value hedges $ (1,248) $ — $ (2,216) $ — Cash flow hedges: Interest rate derivatives Long-term debt interest expense $ 68 $ 76 $ 243 $ 229 Interest rate derivatives Interest and fees on loans and leases (4,197) (483) (5,657) 3,320 Net recognized on cash flow hedges $ (4,265) $ (559) $ (5,900) $ 3,091 The following table summarizes information related to fair value hedging adjustments: Condensed Consolidated Balance Sheet Line Item in Which Hedged Item is Located Notional Amount of Hedged Item Carrying Amount of Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount (In thousands) At September 30, At December 31, At September 30, At December 31, At September 30, At December 31, Deposits $ 400,000 $ — $ 394,130 $ — $ (5,870) $ — Long-term debt (1) 300,000 300,000 329,443 333,458 29,443 33,458 (1) The Company de-designated its fair value hedging relationship on its long-term debt in 2020. The basis adjustment included in the carrying amount is being amortized into interest expense over the remaining life of the long-term debt.
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 September 30, Nine months ended September 30, (In thousands) Non-interest Income 2023 2022 2023 2022 Interest rate derivatives Other income $ 1,474 $ 6,032 $ (2,407) $ 25,291 Mortgage banking derivatives Mortgage banking activities 4 31 (24) (47) Other Other income 1,552 3,196 (104) 4,620 Total not designated as hedging instruments $ 3,030 $ 9,259 $ (2,535) $ 29,864

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Option, Disclosures	The following table compares the fair value to the unpaid principal balance of originated loans held for sale: At September 30, 2023 At December 31, 2022 (In thousands) Fair Value Unpaid Principal Balance Difference Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 837 $ 1,319 $ (482) $ 1,991 $ 1,631 $ 360
Fair Value Measurement Inputs and Valuation Techniques	The following table summarizes the unobservable inputs used to derive the estimated fair value of the Company’s contingent consideration liabilities at September 30, 2023 (dollars in thousands): Agreement Maximum Amount Probability of Achievement Payment Term Discount Rate Fair Value (i) Re-sign broker dealers $ 4,826 99.0 % 2.13 6.40 % $ 4,231 (ii) Deposit program growth $ 12,500 100.0 % 1.25 6.40 % $ 11,568
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 September 30, 2023 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: U.S. Treasury notes $ 387,021 $ — $ — $ 387,021 Government agency debentures — 248,536 — 248,536 Municipal bonds and notes — 1,523,322 — 1,523,322 Agency CMO — 49,905 — 49,905 Agency MBS — 2,252,635 — 2,252,635 Agency CMBS — 1,755,131 — 1,755,131 CMBS — 786,602 — 786,602 Corporate debt — 601,582 — 601,582 Private label MBS — 39,878 — 39,878 Other — 8,779 — 8,779 Total available-for-sale securities 387,021 7,266,370 — 7,653,391 Gross derivative instruments, before netting (1) 713 472,896 — 473,609 Originated loans held for sale — 837 — 837 Investments held in Rabbi Trusts 12,837 — — 12,837 Alternative investments (2) 891 — — 32,206 Total financial assets $ 401,462 $ 7,740,103 $ — $ 8,172,880 Financial Liabilities: Gross derivative instruments, before netting (1) $ 64 $ 557,204 $ — $ 557,268 Contingent consideration — — 15,799 15,799 Total financial liabilities $ 64 $ 557,204 $ 15,799 $ 573,067 At December 31, 2022 (In thousands) Level 1 Level 2 Level 3 Total Financial Assets: Available-for-sale securities: U.S. Treasury notes $ 717,040 $ — $ — $ 717,040 Government agency debentures — 258,374 — 258,374 Municipal bonds and notes — 1,633,202 — 1,633,202 Agency CMO — 59,965 — 59,965 Agency MBS — 2,158,024 — 2,158,024 Agency CMBS — 1,406,486 — 1,406,486 CMBS — 896,640 — 896,640 CLO — 2,107 — 2,107 Corporate debt — 704,412 — 704,412 Private label MBS — 44,249 — 44,249 Other — 12,198 — 12,198 Total available-for-sale securities 717,040 7,175,657 — 7,892,697 Gross derivative instruments, before netting (1) 79 222,827 — 222,906 Originated loans held for sale — 1,991 — 1,991 Investments held in Rabbi Trusts 12,103 — — 12,103 Alternative investments (2) 430 — — 89,678 Total financial assets $ 729,652 $ 7,400,475 $ — $ 8,219,375 Financial Liabilities: Gross derivative instruments, before netting (1) $ 843 $ 413,656 $ — $ 414,499 (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 13: 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 September 30, 2023 At December 31, 2022 (In thousands) Carrying Fair Carrying Fair Assets: Level 1 Cash and cash equivalents $ 2,172,731 $ 2,172,731 $ 839,943 $ 839,943 Level 2 Held-to-maturity investment securities 6,875,772 5,675,674 6,564,697 5,761,453 Level 3 Loans and leases, net 49,452,708 47,196,492 49,169,685 47,604,463 Mortgage servicing assets 8,519 24,822 9,515 27,043 Liabilities: Level 2 Deposit liabilities $ 52,844,248 $ 52,844,248 $ 49,893,391 $ 49,893,391 Time deposits 7,487,519 7,452,837 4,160,949 4,091,979 Securities sold under agreements to repurchase and other borrowings 157,491 157,474 1,151,830 1,151,797 FHLB advances 1,810,218 1,810,810 5,460,552 5,459,218 Long-term debt (1) 1,050,539 995,176 1,073,128 1,001,779

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2023
Retirement Benefits [Abstract]
Summary of Net Periodic Benefit Cost	The following tables summarize the components of net periodic benefit cost (income): Three months ended September 30, 2023 2022 (In thousands) Pension SERP OPEB Pension SERP OPEB Service cost $ — $ — $ 6 $ — $ — $ 9 Interest cost 2,164 48 263 1,441 17 194 Expected return on plan assets (3,435) — — (3,669) — — Amortization of actuarial loss (gain) 1,153 2 (676) 821 7 7 Net periodic benefit (income) cost $ (118) $ 50 $ (407) $ (1,407) $ 24 $ 210 Nine months ended September 30, 2023 2022 (In thousands) Pension SERP OPEB Pension SERP OPEB Service cost $ — $ — $ 20 $ — $ — $ 24 Interest cost 6,586 162 906 4,198 49 551 Expected return on plan assets (8,833) — — (11,006) — — Amortization of actuarial loss (gain) 3,585 5 (2,028) 1,667 20 (30) Net periodic benefit cost (income) $ 1,338 $ 167 $ (1,102) $ (5,141) $ 69 $ 545

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 2,029,204 $ 57,485 $ 544,776 $ — $ 2,631,465 Total assets 42,802,857 118,313 10,803,140 19,406,541 73,130,851 At December 31, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Goodwill $ 1,904,291 $ 57,779 $ 552,034 $ — $ 2,514,104 Total assets 44,380,582 122,729 10,625,334 16,148,876 71,277,521 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 September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 391,386 $ 77,669 $ 195,315 $ (77,234) $ 587,136 Non-interest income 30,605 20,799 26,886 12,092 90,382 Non-interest expense 110,306 39,870 105,703 106,699 362,578 Pre-tax, pre-provision net revenue 311,685 58,598 116,498 (171,841) 314,940 Provision (benefit) for credit losses 39,477 — (3,638) 661 36,500 Income before income taxes 272,208 58,598 120,136 (172,502) 278,440 Income tax expense 68,324 15,822 31,716 (63,897) 51,965 Net income $ 203,884 $ 42,776 $ 88,420 $ (108,605) $ 226,475 Three months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 333,554 $ 58,567 $ 195,748 $ (36,866) $ 551,003 Non-interest income 40,497 25,842 33,842 13,455 113,636 Non-interest expense 102,415 36,725 109,588 81,343 330,071 Pre-tax, pre-provision net revenue 271,636 47,684 120,002 (104,754) 334,568 Provision (benefit) for credit losses 33,341 — (1,989) 5,179 36,531 Income before income taxes 238,295 47,684 121,991 (109,933) 298,037 Income tax expense 59,574 12,779 31,718 (40,002) 64,069 Net income $ 178,721 $ 34,905 $ 90,273 $ (69,931) $ 233,968 Nine months ended September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 1,159,306 $ 224,820 $ 610,353 $ (228,231) $ 1,766,248 Non-interest income 98,257 67,889 81,722 2,654 250,522 Non-interest expense 329,397 126,213 321,462 262,062 $ 1,039,134 Pre-tax, pre-provision net revenue 928,166 $ 166,496 370,613 (487,639) 977,636 Provision (benefit) for credit losses 109,994 — (1,085) 5,838 114,747 Income before income tax expense 818,172 166,496 371,698 (493,477) 862,889 Income tax expense 205,361 44,954 98,128 (168,001) 180,442 Net income $ 612,811 $ 121,542 $ 273,570 $ (325,476) $ 682,447 Nine months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Reconciling Consolidated Total Net interest income $ 954,044 $ 152,702 $ 511,712 $ (186,547) $ 1,431,911 Non-interest income 128,670 79,352 92,541 38,041 338,604 Non-interest expense 294,375 110,674 312,464 330,570 1,048,083 Pre-tax, pre-provision net revenue 788,339 121,380 291,789 (479,076) 722,432 Provision (benefit) for credit losses 238,054 — (5,906) 5,471 237,619 Income before income tax expense 550,285 121,380 297,695 (484,547) 484,813 Income tax expense 133,966 32,530 77,352 (158,567) 85,281 Net income $ 416,319 $ 88,850 $ 220,343 $ (325,980) $ 399,532

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2023
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 16: Segment Reporting. Three months ended September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 5,056 $ 19,573 $ 15,251 $ 1,125 $ 41,005 Loan and lease related fees (1) 4,274 — — — 4,274 Wealth and investment services (2) 2,861 — 4,393 — 7,254 Other income — 1,226 3,541 1,092 5,859 Revenue from contracts with customers 12,191 20,799 23,185 2,217 58,392 Other sources of non-interest income 18,414 — 3,701 9,875 31,990 Total non-interest income $ 30,605 $ 20,799 $ 26,886 $ 12,092 $ 90,382 Three months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 7,573 $ 24,008 $ 18,728 $ 498 $ 50,807 Loan and lease related fees (1) 5,623 — — — 5,623 Wealth and investment services 2,672 — 8,756 (9) 11,419 Other income — 1,834 413 — 2,247 Revenue from contracts with customers 15,868 25,842 27,897 489 70,096 Other sources of non-interest income 24,629 — 5,945 12,966 43,540 Total non-interest income $ 40,497 $ 25,842 $ 33,842 $ 13,455 $ 113,636 Nine months ended September 30, 2023 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 16,028 $ 62,651 $ 52,456 $ 724 $ 131,859 Loan and lease related fees (1) 13,024 — — — 13,024 Wealth and investment services (2) 8,501 — 12,746 (15) 21,232 Other income — 5,238 5,097 3,146 13,481 Revenue from contracts with customers 37,553 67,889 70,299 3,855 179,596 Other sources of non-interest income 60,704 — 11,423 (1,201) 70,926 Total non-interest income $ 98,257 $ 67,889 $ 81,722 $ 2,654 $ 250,522 Nine months ended September 30, 2022 (In thousands) Commercial Banking HSA Bank Consumer Banking Corporate and Consolidated Non-interest Income: Deposit service fees $ 21,905 $ 74,091 $ 53,057 $ 966 $ 150,019 Loan and lease related fees (1) 16,198 — — — 16,198 Wealth and investment services 8,576 — 24,706 (22) 33,260 Other income — 5,261 1,083 — 6,344 Revenue from contracts with customers 46,679 79,352 78,846 944 205,821 Other sources of non-interest income 81,991 — 13,695 37,097 132,783 Total non-interest income $ 128,670 $ 79,352 $ 92,541 $ 38,041 $ 338,604 (1) A portion of loan and lease related fees comprises income generated from factored receivables and payroll financing activities that is within the scope of ASC Topic 606. (2) Effective as of the fourth quarter of 2022, the wealth and investment services revenue stream was impacted by the restructuring of a process in which the Company offers brokerage, investment advisory, and certain insurance-related services to customers. The staff providing these services, who had previously been employees of the Bank, are now employees of a third-party service provider. As a result, the Company now recognizes income from this program on a net basis, which thereby reduces gross reported wealth and investment services non-interest income and the related compensation and benefits non-interest expense on the accompanying Condensed Consolidated Statements of Income.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, At December 31, 2022 Commitments to extend credit $ 11,130,936 $ 11,237,496 Standby letters of credit 402,120 380,655 Commercial letters of credit 56,464 53,512 Total credit-related financial instruments with off-balance sheet risk $ 11,589,520 $ 11,671,663

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details) - Accounting Standards Update 2022-02 $ in Millions	Jan. 01, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 5.9
Deferred Income Tax Assets, Net
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.7
Retained Earnings [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 4.2

Mergers and Acquisitions - Narr

Mergers and Acquisitions - Narrative (Details) $ in Thousands	Jan. 11, 2023 USD ($)	Feb. 18, 2022 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jan. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Depositary share, interest in a share of preferred stock						0.025
Goodwill			$ 2,631,465	$ 2,514,104	$ 2,514,104			$ 538,373
Sterling
Business Acquisition [Line Items]
Goodwill						$ 1,914,204	$ 1,900,000
Net assets acquired						$ 3,266,096
Net assets acquired			$ 25,600
Bend Financial, Inc.
Business Acquisition [Line Items]
Equity interests acquired		100%
Cash consideration		$ 55,300
Net assets acquired		19,600
Bend Financial, Inc. | Internal use software
Business Acquisition [Line Items]
Intangible assets acquired		15,900
Bend Financial, Inc. | Customer relationships (1)
Business Acquisition [Line Items]
Intangible assets acquired		$ 3,000
interLINK
Business Acquisition [Line Items]
Equity interests acquired	10,000%
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

Mergers and Acquisitions - Summ

Mergers and Acquisitions - Summary of Purchase Price Consideration (Details) $ in Thousands	Jan. 31, 2022 USD ($)
Sterling
Business Acquisition [Line Items]
Total consideration	$ 5,180,300

Mergers and Acquisitions - Su_2

Mergers and Acquisitions - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jan. 01, 2022	Dec. 31, 2021
Liabilities:
Goodwill		$ 2,631,465	$ 2,514,104	$ 2,514,104		$ 538,373
Sterling
Business Acquisition [Line Items]
Total consideration	$ 5,180,300
Assets:
Cash and due from banks	510,929
Interest-bearing deposits	3,207
Investment securities available-for-sale	4,429,948
Federal Home Loan Bank and Federal Reserve Bank Stock	150,502
Loans held for sale	23,517
Unpaid principal balance, total loans and leases		20,816,348
Total loans and leases	20,498,706
Deferred tax assets, net	(59,716)
Premises and equipment	264,421
Other intangible assets	210,100
Bank-owned life insurance policies	645,510
Accrued interest receivable and other assets	986,729
Total assets acquired	27,663,853
Liabilities:
Non-interest-bearing deposits	6,620,248
Interest-bearing deposits	16,643,755
Securities sold under agreements to repurchase and other borrowings	27,184
Long-term debt	516,881
Accrued expenses and other liabilities	589,689
Total liabilities assumed	24,397,757
Net assets acquired	3,266,096
Goodwill	1,914,204				$ 1,900,000
Sterling | Commercial non-mortgage
Assets:
Unpaid principal balance, total loans and leases		5,570,782
Total loans and leases	5,527,657
Sterling | Asset-based
Assets:
Unpaid principal balance, total loans and leases		694,137
Total loans and leases	683,958
Sterling | Commercial real estate
Assets:
Unpaid principal balance, total loans and leases		6,790,600
Total loans and leases	6,656,405
Sterling | Multi-family
Assets:
Unpaid principal balance, total loans and leases		4,303,381
Total loans and leases	4,255,906
Sterling | Equipment financing
Assets:
Unpaid principal balance, total loans and leases		1,350,579
Total loans and leases	1,314,311
Sterling | Warehouse lending
Assets:
Unpaid principal balance, total loans and leases		647,767
Total loans and leases	643,754
Sterling | Residential
Assets:
Unpaid principal balance, total loans and leases		1,313,785
Total loans and leases	1,281,637
Sterling | Home equity
Assets:
Unpaid principal balance, total loans and leases		132,758
Total loans and leases	122,553
Sterling | Other consumer
Assets:
Unpaid principal balance, total loans and leases		$ 12,559
Total loans and leases	$ 12,525

Mergers and Acquisitions- Summa

Mergers and Acquisitions- Summary of Supplemental Pro Forma Information Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Accrued severance and other benefits	$ 19,589	$ 33,017	$ 19,589	$ 33,017	$ 26,944	$ 37,945	$ 42,218	$ 10,835
Strategic initiative charges	17,557	840	25,741	53,323
Payments for Restructuring	(24,746)	(10,032)	(36,284)	(26,827)
Adjustments	(166)	(9)	(7,813)	(4,314)
Employee Severance [Member]
Business Acquisition [Line Items]
Accrued severance and other benefits	5,589	15,313	5,589	15,313	3,169	7,583	24,514	10,835
Strategic initiative charges	3,557	840	11,741	35,619
Payments for Restructuring	(971)	(10,032)	(12,509)	(26,827)
Adjustments	(166)	(9)	(1,226)	(4,314)
Occupancy
Business Acquisition [Line Items]
Accrued severance and other benefits	14,000	17,704	14,000	17,704	$ 23,775	$ 30,362	$ 17,704	$ 0
Strategic initiative charges	14,000	0	14,000	17,704
Payments for Restructuring	(23,775)	0	(23,775)	0
Adjustments	0	0	(6,587)	0
Sterling
Business Acquisition [Line Items]
Merger-related expenses	61,625	25,536	131,838	200,671
Sterling | Employee Severance [Member]
Business Acquisition [Line Items]
Adjustments				4,300
Compensation and benefits | Sterling
Business Acquisition [Line Items]
Merger-related expenses	9,583	5,770	27,370	71,472
Occupancy | Sterling
Business Acquisition [Line Items]
Merger-related expenses	(79)	4,389	1,151	35,744
Technology and equipment | Sterling
Business Acquisition [Line Items]
Merger-related expenses	9,652	1,478	14,780	21,375
Business Combination, Increase (Decrease) In Acquisition Related Costs			4,800
Professional and outside services | Sterling
Business Acquisition [Line Items]
Merger-related expenses	18,171	10,792	57,119	59,073
Marketing | Sterling
Business Acquisition [Line Items]
Merger-related expenses	1,574	64	2,535	199
Other expense | Sterling
Business Acquisition [Line Items]
Merger-related expenses	22,724	$ 3,043	$ 28,883	$ 12,808
Business Combination, Increase (Decrease) In Acquisition Related Costs	$ 1,700

Investment Securities (Summary

Investment Securities (Summary Of Debt Securities Available-for-Sale) (Detail) $ in Thousands	Sep. 30, 2023 USD ($) holding	Dec. 31, 2022 USD ($) holding
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	$ 8,775,541	$ 8,757,155
Unrealized Gains	131	31
Unrealized Losses	(1,122,281)	(864,489)
Investment securities available-for-sale, at fair value	7,653,391	7,892,697
Less than 12 months, fair value	909,209	5,417,865
Less than 12 months, unrealized losses	(50,079)	(532,120)
12 months or more, fair value	6,706,151	2,429,126
12 months or more, unrealized losses	$ (1,072,202)	$ (332,369)
Total, number of holdings | holding	1,253	1,282
Total, fair value	$ 7,615,360	$ 7,846,991
Total, unrealized losses	(1,122,281)	(864,489)
Amortized Cost
Maturing within 1 year	48,951
After 1 year through 5 years	1,026,082
After 5 through 10 years	1,348,774
After 10 years	6,351,734
Amortized Cost - Total available-for-sale debt securities	8,775,541	8,757,155
Fair Value
Maturing within 1 year	47,286
After 1 year through 5 years	961,447
After 5 through 10 years	1,198,635
After 10 years	5,446,023
Fair Value, Total available-for-sale debt securities	7,653,391	7,892,697
Available-for-sale securities pledged	6,902,811	3,768,173
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	909,209	5,417,865
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	50,079	532,120
12 months or more, fair value	6,706,151	2,429,126
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,072,202	$ 332,369
Total, number of holdings | holding	1,253	1,282
Total, fair value	$ 7,615,360	$ 7,846,991
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1,122,281	864,489
U.S. Treasury notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	407,891	755,968
Unrealized Gains	0	0
Unrealized Losses	(20,870)	(38,928)
Investment securities available-for-sale, at fair value	387,021	717,040
Less than 12 months, fair value		337,563
Less than 12 months, unrealized losses		(19,167)
12 months or more, fair value	387,021	379,477
12 months or more, unrealized losses	$ (20,870)	$ (19,761)
Total, number of holdings | holding	14	23
Total, fair value	$ 387,021	$ 717,040
Total, unrealized losses	(20,870)	(38,928)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	407,891	755,968
Fair Value
Fair Value, Total available-for-sale debt securities	387,021	717,040
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value		337,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		19,167
12 months or more, fair value	387,021	379,477
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 20,870	$ 19,761
Total, number of holdings | holding	14	23
Total, fair value	$ 387,021	$ 717,040
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	20,870	38,928
Government agency debentures
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	302,164	302,018
Unrealized Gains	0	0
Unrealized Losses	(53,628)	(43,644)
Investment securities available-for-sale, at fair value	248,536	258,374
Less than 12 months, fair value		258,374
Less than 12 months, unrealized losses		$ (43,644)
12 months or more, fair value	248,536
12 months or more, unrealized losses	$ (53,628)
Total, number of holdings | holding	19	19
Total, fair value	$ 248,536	$ 258,374
Total, unrealized losses	(53,628)	(43,644)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	302,164	302,018
Fair Value
Fair Value, Total available-for-sale debt securities	248,536	258,374
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value		258,374
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 43,644
12 months or more, fair value	248,536
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 53,628
Total, number of holdings | holding	19	19
Total, fair value	$ 248,536	$ 258,374
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	53,628	43,644
Municipal bonds and notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	1,646,582	1,719,110
Unrealized Gains	2	5
Unrealized Losses	(123,262)	(85,913)
Investment securities available-for-sale, at fair value	1,523,322	1,633,202
Less than 12 months, fair value	34,562	1,616,771
Less than 12 months, unrealized losses	(1,836)	$ (85,913)
12 months or more, fair value	1,484,023
12 months or more, unrealized losses	$ (121,426)
Total, number of holdings | holding	416	444
Total, fair value	$ 1,518,585	$ 1,616,771
Total, unrealized losses	(123,262)	(85,913)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	1,646,582	1,719,110
Fair Value
Fair Value, Total available-for-sale debt securities	1,523,322	1,633,202
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	34,562	1,616,771
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,836	$ 85,913
12 months or more, fair value	1,484,023
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 121,426
Total, number of holdings | holding	416	444
Total, fair value	$ 1,518,585	$ 1,616,771
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	123,262	85,913
Agency CMO
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	55,718	64,984
Unrealized Gains	0	0
Unrealized Losses	(5,813)	(5,019)
Investment securities available-for-sale, at fair value	49,905	59,965
Less than 12 months, fair value		55,693
Less than 12 months, unrealized losses		(4,640)
12 months or more, fair value	49,905	4,272
12 months or more, unrealized losses	$ (5,813)	$ (379)
Total, number of holdings | holding	36	39
Total, fair value	$ 49,905	$ 59,965
Total, unrealized losses	(5,813)	(5,019)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	55,718	64,984
Fair Value
Fair Value, Total available-for-sale debt securities	49,905	59,965
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value		55,693
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		4,640
12 months or more, fair value	49,905	4,272
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 5,813	$ 379
Total, number of holdings | holding	36	39
Total, fair value	$ 49,905	$ 59,965
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5,813	5,019
Agency MBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	2,636,344	2,461,337
Unrealized Gains	123	26
Unrealized Losses	(383,832)	(303,339)
Investment securities available-for-sale, at fair value	2,252,635	2,158,024
Less than 12 months, fair value	339,979	1,641,544
Less than 12 months, unrealized losses	(8,137)	(206,412)
12 months or more, fair value	1,883,669	515,206
12 months or more, unrealized losses	$ (375,695)	$ (96,927)
Total, number of holdings | holding	477	460
Total, fair value	$ 2,223,648	$ 2,156,750
Total, unrealized losses	(383,832)	(303,339)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	2,636,344	2,461,337
Fair Value
Fair Value, Total available-for-sale debt securities	2,252,635	2,158,024
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	339,979	1,641,544
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8,137	206,412
12 months or more, fair value	1,883,669	515,206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 375,695	$ 96,927
Total, number of holdings | holding	477	460
Total, fair value	$ 2,223,648	$ 2,156,750
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	383,832	303,339
Agency CMBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	2,152,871	1,664,600
Unrealized Gains	0	0
Unrealized Losses	(397,740)	(258,114)
Investment securities available-for-sale, at fair value	1,755,131	1,406,486
Less than 12 months, fair value	490,774	485,333
Less than 12 months, unrealized losses	(39,102)	(68,674)
12 months or more, fair value	1,264,357	921,153
12 months or more, unrealized losses	$ (358,638)	$ (189,440)
Total, number of holdings | holding	151	132
Total, fair value	$ 1,755,131	$ 1,406,486
Total, unrealized losses	(397,740)	(258,114)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	2,152,871	1,664,600
Fair Value
Fair Value, Total available-for-sale debt securities	1,755,131	1,406,486
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	490,774	485,333
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	39,102	68,674
12 months or more, fair value	1,264,357	921,153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 358,638	$ 189,440
Total, number of holdings | holding	151	132
Total, fair value	$ 1,755,131	$ 1,406,486
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	397,740	258,114
CMBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	811,117	929,588
Unrealized Gains	0	0
Unrealized Losses	(24,515)	(32,948)
Investment securities available-for-sale, at fair value	786,602	896,640
Less than 12 months, fair value	43,894	273,150
Less than 12 months, unrealized losses	(1,004)	(8,982)
12 months or more, fair value	742,708	598,490
12 months or more, unrealized losses	$ (23,511)	$ (23,966)
Total, number of holdings | holding	45	52
Total, fair value	$ 786,602	$ 871,640
Total, unrealized losses	(24,515)	(32,948)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	811,117	929,588
Fair Value
Fair Value, Total available-for-sale debt securities	786,602	896,640
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	43,894	273,150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,004	8,982
12 months or more, fair value	742,708	598,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 23,511	$ 23,966
Total, number of holdings | holding	45	52
Total, fair value	$ 786,602	$ 871,640
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	24,515	32,948
CLO
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities		2,108
Unrealized Gains		0
Unrealized Losses		(1)
Investment securities available-for-sale, at fair value		2,107
12 months or more, fair value		2,107
12 months or more, unrealized losses		$ (1)
Total, number of holdings | holding		1
Total, fair value		$ 2,107
Total, unrealized losses		(1)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities		2,108
Fair Value
Fair Value, Total available-for-sale debt securities		2,107
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
12 months or more, fair value		2,107
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ 1
Total, number of holdings | holding		1
Total, fair value		$ 2,107
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		1
Corporate debt
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	706,110	795,999
Unrealized Gains	6	0
Unrealized Losses	(104,534)	(91,587)
Investment securities available-for-sale, at fair value	601,582	704,412
Less than 12 months, fair value	0	692,990
Less than 12 months, unrealized losses	0	(89,692)
12 months or more, fair value	597,275	8,421
12 months or more, unrealized losses	$ (104,534)	$ (1,895)
Total, number of holdings | holding	90	105
Total, fair value	$ 597,275	$ 701,411
Total, unrealized losses	(104,534)	(91,587)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	706,110	795,999
Fair Value
Fair Value, Total available-for-sale debt securities	601,582	704,412
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	0	692,990
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	89,692
12 months or more, fair value	597,275	8,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 104,534	$ 1,895
Total, number of holdings | holding	90	105
Total, fair value	$ 597,275	$ 701,411
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	104,534	91,587
Private label MBS
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	46,921	48,895
Unrealized Gains	0	0
Unrealized Losses	(7,043)	(4,646)
Investment securities available-for-sale, at fair value	39,878	44,249
Less than 12 months, fair value	0	44,249
Less than 12 months, unrealized losses	0	$ (4,646)
12 months or more, fair value	39,878
12 months or more, unrealized losses	$ (7,043)
Total, number of holdings | holding	3	3
Total, fair value	$ 39,878	$ 44,249
Total, unrealized losses	(7,043)	(4,646)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	46,921	48,895
Fair Value
Fair Value, Total available-for-sale debt securities	39,878	44,249
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	0	44,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	$ 4,646
12 months or more, fair value	39,878
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7,043
Total, number of holdings | holding	3	3
Total, fair value	$ 39,878	$ 44,249
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	7,043	4,646
Other
Debt Securities, Available-for-sale [Abstract]
Amortized Cost - Total available-for-sale debt securities	9,823	12,548
Unrealized Gains	0	0
Unrealized Losses	(1,044)	(350)
Investment securities available-for-sale, at fair value	8,779	12,198
Less than 12 months, fair value		12,198
Less than 12 months, unrealized losses		$ (350)
12 months or more, fair value	8,779
12 months or more, unrealized losses	$ (1,044)
Total, number of holdings | holding	2	4
Total, fair value	$ 8,779	$ 12,198
Total, unrealized losses	(1,044)	(350)
Amortized Cost
Amortized Cost - Total available-for-sale debt securities	9,823	12,548
Fair Value
Fair Value, Total available-for-sale debt securities	8,779	12,198
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value		12,198
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 350
12 months or more, fair value	8,779
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,044
Total, number of holdings | holding	2	4
Total, fair value	$ 8,779	$ 12,198
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1,044	350
Pledged For Borrowings
Fair Value
Available-for-sale securities pledged	3,991,253	1,195,101
Pledged For Municipal Deposits
Fair Value
Available-for-sale securities pledged	$ 2,911,558	$ 2,573,072

Investment Securities (Summar_2

Investment Securities (Summary of Held-to-Maturity Debt Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Amortized Cost	$ 6,875,975		$ 6,564,879
Unrealized Gains	36		2,770
Unrealized Losses	(1,200,337)		(806,196)
Fair Value	5,675,674		5,761,453
Allowance	203	$ 216	182	$ 209	$ 210	$ 214
Net Carrying Value	6,875,772		6,564,697
Interest receivable	19,700		24,200
Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	434,217		485,648
Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	6,020,778		5,649,733
Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	254,061		255,235
Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	115,800		116,870
Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	32,908		38,177
Moody's, A2 Rating
Schedule of Investments [Line Items]
Amortized Cost	0		4,165
Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	14,046		15,051
Agency CMO
Schedule of Investments [Line Items]
Amortized Cost	24,406		28,358
Unrealized Gains	0		0
Unrealized Losses	(2,482)		(2,060)
Fair Value	21,924		26,298
Allowance	0		0
Net Carrying Value	24,406		28,358
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	24,406		28,358
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, A2 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	2,470,192		2,626,114
Unrealized Gains	34		827
Unrealized Losses	(428,971)		(339,592)
Fair Value	2,041,255		2,287,349
Allowance	0		0
Net Carrying Value	2,470,192		2,626,114
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	2,470,192		2,626,114
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, A2 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	3,363,390		2,831,949
Unrealized Gains	0		845
Unrealized Losses	(662,950)		(407,648)
Fair Value	2,700,440		2,425,146
Allowance	0		0
Net Carrying Value	3,363,390		2,831,949
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	3,363,390		2,831,949
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, A2 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	917,755		928,845
Unrealized Gains	2		1,098
Unrealized Losses	(96,878)		(47,183)
Fair Value	820,879		882,760
Allowance	203		182
Net Carrying Value	917,552		928,663
Municipal bonds and notes | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	333,985		336,035
Municipal bonds and notes | Moody's, Aa1 Rating
Schedule of Investments [Line Items]
Amortized Cost	162,790		163,312
Municipal bonds and notes | Moody's, Aa2 Rating
Schedule of Investments [Line Items]
Amortized Cost	254,061		255,235
Municipal bonds and notes | Moody's, Aa3 Rating
Schedule of Investments [Line Items]
Amortized Cost	115,800		116,870
Municipal bonds and notes | Moody's, A1 Rating
Schedule of Investments [Line Items]
Amortized Cost	32,908		38,177
Municipal bonds and notes | Moody's, A2 Rating
Schedule of Investments [Line Items]
Amortized Cost	0		4,165
Municipal bonds and notes | Moody's, Not Rated
Schedule of Investments [Line Items]
Amortized Cost	14,046		15,051
CMBS
Schedule of Investments [Line Items]
Amortized Cost	100,232		149,613
Unrealized Gains	0		0
Unrealized Losses	(9,056)		(9,713)
Fair Value	91,176		139,900
Allowance	0		0
Net Carrying Value	100,232		149,613
CMBS | Moody's, Aaa Rating
Schedule of Investments [Line Items]
Amortized Cost	100,232		149,613
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, A2 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	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available-for-sale securities	$ 398,296	$ 65,330

Investments Securities (Allowan

Investments Securities (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 216	$ 210	$ 182	$ 214
(Benefit) provision for credit losses	(13)	(1)	21	(5)
Balance, end of period	$ 203	$ 209	$ 203	$ 209

Investment Securities (Summar_3

Investment Securities (Summary Of Debt Securities Held-to Maturity - Contractual Maturities, Credit Quality and Other Information) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Maturing within 1 year	$ 8,334
After 1 year through 5 years	57,037
After 5 through 10 years	363,281
After 10 years	6,447,323
Amortized Cost	6,875,975	$ 6,564,879
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Maturing within 1 year	8,308
After 1 year through 5 years	56,361
After 5 through 10 years	333,255
After 10 years	5,277,750
Fair Value	5,675,674	5,761,453
Held-to-maturity securities pledged	6,565,949	1,857,512
Moody's, Aaa Rating
Amortized Cost
Amortized Cost	434,217	485,648
Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	6,020,778	5,649,733
Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	254,061	255,235
Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	115,800	116,870
Moody's, A1 Rating
Amortized Cost
Amortized Cost	32,908	38,177
Moody's, A2 Rating
Amortized Cost
Amortized Cost	0	4,165
Moody's, A3 Rating
Amortized Cost
Amortized Cost	4,165	0
Moody's, Not Rated
Amortized Cost
Amortized Cost	14,046	15,051
Pledged For Municipal Deposits
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held-to-maturity securities pledged	1,623,674	1,596,777
Pledged For Borrowings
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Held-to-maturity securities pledged	4,942,275	260,735
Agency CMO
Amortized Cost
Amortized Cost	24,406	28,358
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	21,924	26,298
Agency CMO | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	0	0
Agency CMO | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	24,406	28,358
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, A2 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	2,470,192	2,626,114
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	2,041,255	2,287,349
Agency MBS | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	0	0
Agency MBS | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	2,470,192	2,626,114
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, A2 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	3,363,390	2,831,949
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	2,700,440	2,425,146
Agency CMBS | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	0	0
Agency CMBS | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	3,363,390	2,831,949
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, A2 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	917,755	928,845
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	820,879	882,760
Municipal bonds and notes | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	333,985	336,035
Municipal bonds and notes | Moody's, Aa1 Rating
Amortized Cost
Amortized Cost	162,790	163,312
Municipal bonds and notes | Moody's, Aa2 Rating
Amortized Cost
Amortized Cost	254,061	255,235
Municipal bonds and notes | Moody's, Aa3 Rating
Amortized Cost
Amortized Cost	115,800	116,870
Municipal bonds and notes | Moody's, A1 Rating
Amortized Cost
Amortized Cost	32,908	38,177
Municipal bonds and notes | Moody's, A2 Rating
Amortized Cost
Amortized Cost	0	4,165
Municipal bonds and notes | Moody's, A3 Rating
Amortized Cost
Amortized Cost	4,165	0
Municipal bonds and notes | Moody's, Not Rated
Amortized Cost
Amortized Cost	14,046	15,051
CMBS
Amortized Cost
Amortized Cost	100,232	149,613
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value	91,176	139,900
CMBS | Moody's, Aaa Rating
Amortized Cost
Amortized Cost	100,232	149,613
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, A2 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 ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Interest receivable	$ 42,500,000		$ 36,900,000
Held-to-maturity debt securities	6,875,975,000		6,564,879,000
Held-to-maturity investment securities in non-accrual status	0		0
Investment securities available-for-sale, at fair value	7,653,391,000		$ 7,892,697,000
Equity Securities, FV-NI, Realized Loss	(20,500,000)	$ (2,200,000)
Total Loss Recognized, Portion Included In Provision For Credit Losses	3,800,000
Decrease in unrealized losses	257,800,000
Callable
Schedule of Investments [Line Items]
Held-to-maturity debt securities	900,000,000
Investment securities available-for-sale, at fair value	$ 2,500,000,000

Loans and Leases (By Portfolio

Loans and Leases (By Portfolio and Class) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 50,088,146	$ 49,764,426
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	40,274,740	40,103,951
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	16,508,188	16,392,795
Commercial Portfolio Segment [Member] | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,632,962	1,821,642
Commercial Portfolio Segment [Member] | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,348,495	12,997,163
Commercial Portfolio Segment [Member] | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	7,234,759	6,621,982
Commercial Portfolio Segment [Member] | Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,431,858	1,628,393
Commercial Portfolio Segment [Member] | Warehouse lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	118,478	641,976
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	9,813,406	9,660,475
Consumer Portfolio Segment [Member] | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	8,228,451	7,963,420
Consumer Portfolio Segment [Member] | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,533,046	1,633,107
Consumer Portfolio Segment [Member] | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 51,909	$ 63,948

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized premiums	$ (34.9)		$ (34.9)		$ (68.7)
Interest receivable	261.7		261.7		226.3
Interest on non-accrual loans	7.8	$ 7.6	18.6	$ 14.1
Number of Loans and Leases | loan		30		82
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Write-down		$ 0		$ 10
Number of Loans and Leases | loan				5
Aggregated amortized cost of loans and leases				$ 0.9
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Write-down		$ 0.1		$ 0.2
Collateral Pledged | FHLB | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	16,600		16,600
Collateral Pledged | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable	35.9		35.9		43.8
Collateral Pledged | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable	41		41		45.2
Collateral Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable	$ 110.6		$ 110.6		$ 108

Loans and Leases (Summary Of Lo

Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 50,088,146	$ 49,764,426
90 or More Days Past Due and Accruing	138	726
Non-accrual	214,065	197,441
Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	284,997	270,835
30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	61,503	32,379
60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	9,291	40,289
Current
Financing Receivable, Past Due [Line Items]
Loans and leases	49,803,149	49,493,591
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	40,274,740	40,103,951
90 or More Days Past Due and Accruing	138	713
Non-accrual	160,290	143,945
Commercial Portfolio Segment [Member] | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	202,886	196,771
Commercial Portfolio Segment [Member] | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	39,987	17,812
Commercial Portfolio Segment [Member] | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	2,471	34,301
Commercial Portfolio Segment [Member] | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	40,071,854	39,907,180
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	16,508,188	16,392,795
90 or More Days Past Due and Accruing	138	645
Non-accrual	110,891	71,884
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	116,789	81,784
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	4,209	8,434
Commercial Portfolio Segment [Member] | Commercial non-mortgage | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,551	821
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	16,391,399	16,311,011
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Past Due [Line Items]
Loans and leases	1,632,962	1,821,642
90 or More Days Past Due and Accruing	0	0
Non-accrual	10,325	20,024
Commercial Portfolio Segment [Member] | Asset-based | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	10,325	25,945
Commercial Portfolio Segment [Member] | Asset-based | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	5,921
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	1,622,637	1,795,697
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	13,348,495	12,997,163
90 or More Days Past Due and Accruing	0	68
Non-accrual	25,376	39,057
Commercial Portfolio Segment [Member] | Commercial real estate | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	26,780	64,111
Commercial Portfolio Segment [Member] | Commercial real estate | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,404	1,494
Commercial Portfolio Segment [Member] | Commercial real estate | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	23,492
Commercial Portfolio Segment [Member] | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	13,321,715	12,933,052
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Past Due [Line Items]
Loans and leases	7,234,759	6,621,982
90 or More Days Past Due and Accruing	0	0
Non-accrual	5,726	636
Commercial Portfolio Segment [Member] | Multi-family | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	7,984	1,793
Commercial Portfolio Segment [Member] | Multi-family | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	2,103	1,157
Commercial Portfolio Segment [Member] | Multi-family | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	155	0
Commercial Portfolio Segment [Member] | Multi-family | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	7,226,775	6,620,189
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Past Due [Line Items]
Loans and leases	1,431,858	1,628,393
90 or More Days Past Due and Accruing	0	0
Non-accrual	7,972	12,344
Commercial Portfolio Segment [Member] | Equipment financing | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	41,008	23,138
Commercial Portfolio Segment [Member] | Equipment financing | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	32,271	806
Commercial Portfolio Segment [Member] | Equipment financing | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	765	9,988
Commercial Portfolio Segment [Member] | Equipment financing | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,390,850	1,605,255
Commercial Portfolio Segment [Member] | Warehouse lending
Financing Receivable, Past Due [Line Items]
Loans and leases	118,478	641,976
90 or More Days Past Due and Accruing	0	0
Non-accrual	0	0
Commercial Portfolio Segment [Member] | Warehouse lending | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial Portfolio Segment [Member] | Warehouse lending | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial Portfolio Segment [Member] | Warehouse lending | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial Portfolio Segment [Member] | Warehouse lending | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	118,478	641,976
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans and leases	9,813,406	9,660,475
90 or More Days Past Due and Accruing	0	13
Non-accrual	53,775	53,496
Consumer Portfolio Segment [Member] | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	82,111	74,064
Consumer Portfolio Segment [Member] | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	21,516	14,567
Consumer Portfolio Segment [Member] | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	6,820	5,988
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	9,731,295	9,586,411
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Past Due [Line Items]
Loans and leases	8,228,451	7,963,420
90 or More Days Past Due and Accruing	0	0
Non-accrual	27,623	25,424
Consumer Portfolio Segment [Member] | Residential | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	43,872	36,753
Consumer Portfolio Segment [Member] | Residential | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	12,920	8,246
Consumer Portfolio Segment [Member] | Residential | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,329	3,083
Consumer Portfolio Segment [Member] | Residential | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	8,184,579	7,926,667
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Past Due [Line Items]
Loans and leases	1,533,046	1,633,107
90 or More Days Past Due and Accruing	0	0
Non-accrual	26,042	27,924
Consumer Portfolio Segment [Member] | Home equity | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	37,559	36,037
Consumer Portfolio Segment [Member] | Home equity | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	8,145	5,293
Consumer Portfolio Segment [Member] | Home equity | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	3,372	2,820
Consumer Portfolio Segment [Member] | Home equity | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	1,495,487	1,597,070
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Past Due [Line Items]
Loans and leases	51,909	63,948
90 or More Days Past Due and Accruing	0	13
Non-accrual	110	148
Consumer Portfolio Segment [Member] | Other consumer | Total Past Due and Non-accrual
Financing Receivable, Past Due [Line Items]
Loans and leases	680	1,274
Consumer Portfolio Segment [Member] | Other consumer | 30-59 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	451	1,028
Consumer Portfolio Segment [Member] | Other consumer | 60-89 Days Past Due and Accruing
Financing Receivable, Past Due [Line Items]
Loans and leases	119	85
Consumer Portfolio Segment [Member] | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 51,229	$ 62,674

Loans and Leases (Nonaccrual) (

Loans and Leases (Nonaccrual) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	$ 214,065	$ 197,441
Non-accrual with No Allowance	74,397	42,059
Commercial Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	160,290	143,945
Non-accrual with No Allowance	48,957	16,419
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	110,891	71,884
Non-accrual with No Allowance	19,274	12,598
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	10,325	20,024
Non-accrual with No Allowance	1,330	1,491
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	25,376	39,057
Non-accrual with No Allowance	21,084	90
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	5,726	636
Non-accrual with No Allowance	5,726	0
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	7,972	12,344
Non-accrual with No Allowance	1,543	2,240
Commercial Portfolio Segment [Member] | Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	53,775	53,496
Non-accrual with No Allowance	25,440	25,640
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	27,623	25,424
Non-accrual with No Allowance	11,440	10,442
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	26,042	27,924
Non-accrual with No Allowance	13,995	15,193
Consumer Portfolio Segment [Member] | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	110	148
Non-accrual with No Allowance	$ 5	$ 5

Loans and Leases (Activity In A

Loans and Leases (Activity In Allowance For Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period	$ 635,438	$ 574,325	$ 635,438	$ 574,325	$ 628,911		$ 571,499
Provision (benefit) for credit losses	35,839	31,352	108,909	232,148
Initial allowance for PCD loans and leases			0	88,045
Recoveries	1,690	4,283	7,455	17,775
Charge-offs	(31,002)	(32,809)	(81,540)	(64,830)
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period						$ 5,873		$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period	584,493	516,315	584,493	516,315	572,653		511,745
Provision (benefit) for credit losses	38,908	34,513	116,489	230,881
Initial allowance for PCD loans and leases			0	78,376
Recoveries	292	1,413	2,890	10,542
Charge-offs	(27,360)	(31,356)	(75,715)	(61,361)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period						7,704		0
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period	50,945	58,010	50,945	58,010	$ 56,258		$ 59,754
Provision (benefit) for credit losses	(3,069)	(3,161)	(7,580)	1,267
Initial allowance for PCD loans and leases			0	9,669
Recoveries	1,398	2,870	4,565	7,233
Charge-offs	$ (3,642)	$ (1,453)	$ (5,825)	$ (3,469)
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance, end of period						$ (1,831)		$ 0

Loans and Leases (Allowance For

Loans and Leases (Allowance For Loan And Lease Losses By Portfolio Segment) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period				$ 594,741	$ 301,187
Initial allowance for PCD loans and leases				0	88,045
Provision (benefit)		$ 35,839	$ 31,352	108,909	232,148
Charge-offs		(31,002)	(32,809)	(81,540)	(64,830)
Recoveries		1,690	4,283	7,455	17,775
Balance, end of period		635,438	574,325	635,438	574,325		$ 594,741		$ 301,187
ALLL, Individually evaluated for impairment		47,177	49,672	47,177	49,672
ALLL, Collectively evaluated for impairment		588,261	524,653	588,261	524,653
Balance, end of period		635,438	574,325	635,438	574,325	$ 628,911		$ 571,499
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, end of period							5,873		0
PCD loans | Sterling
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge-offs	$ (48,300)
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period				533,125	257,877
Initial allowance for PCD loans and leases				0	78,376
Provision (benefit)		38,908	34,513	116,489	230,881
Charge-offs		(27,360)	(31,356)	(75,715)	(61,361)
Recoveries		292	1,413	2,890	10,542
Balance, end of period		584,493	516,315	584,493	516,315		533,125		257,877
ALLL, Individually evaluated for impairment		40,756	36,394	40,756	36,394
ALLL, Collectively evaluated for impairment		543,737	479,921	543,737	479,921
Balance, end of period		584,493	516,315	584,493	516,315	572,653		511,745
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, end of period							7,704		0
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period				61,616	43,310
Initial allowance for PCD loans and leases				0	9,669
Provision (benefit)		(3,069)	(3,161)	(7,580)	1,267
Charge-offs		(3,642)	(1,453)	(5,825)	(3,469)
Recoveries		1,398	2,870	4,565	7,233
Balance, end of period		50,945	58,010	50,945	58,010		61,616		43,310
ALLL, Individually evaluated for impairment		6,421	13,278	6,421	13,278
ALLL, Collectively evaluated for impairment		44,524	44,732	44,524	44,732
Balance, end of period		$ 50,945	$ 58,010	$ 50,945	$ 58,010	$ 56,258		$ 59,754
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, end of period							$ (1,831)		$ 0

Loans and Leases (Credit Qualit

Loans and Leases (Credit Quality Indicators) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 50,088,146	$ 49,764,426
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	5,189,680	11,169,564
Year two	10,351,204	5,661,880
Year three	4,798,025	3,487,488
Year four	2,866,721	3,539,935
Year five	2,871,541	2,445,305
Prior	6,558,823	5,530,594
Revolving Loans Amortized Cost Basis	7,638,746	8,269,185
Loans and leases	40,274,740	40,103,951
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	75,715
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	44,431
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	16,184
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	6,958
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	3,221
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	2,007
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	2,914
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,062,125	5,287,261
Year two	4,579,438	1,979,460
Year three	1,535,339	1,057,097
Year four	834,448	829,845
Year five	686,900	678,464
Prior	1,020,364	804,822
Revolving Loans Amortized Cost Basis	5,789,574	5,755,846
Loans and leases	16,508,188	16,392,795
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	7,512
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	3,782
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	241
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	511
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	647
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	2,007
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	324
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	11,188	19,659
Year two	5,124	3,901
Year three	0	9,424
Year four	1,374	15,904
Year five	9,106	5,163
Prior	44,529	55,553
Revolving Loans Amortized Cost Basis	1,561,641	1,712,038
Loans and leases	1,632,962	1,821,642
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	16,189
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	3,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	13,189
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,631,180	3,443,032
Year two	3,523,922	2,258,126
Year three	1,965,154	1,563,665
Year four	1,377,854	1,674,603
Year five	1,329,295	1,153,170
Prior	3,352,038	2,805,735
Revolving Loans Amortized Cost Basis	169,052	98,832
Loans and leases	13,348,495	12,997,163
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	48,306
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	36,575
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	2,754
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	3,813
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	2,574
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	2,590
Commercial Portfolio Segment [Member] | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,214,619	2,030,657
Year two	1,913,835	1,057,705
Year three	1,020,778	507,447
Year four	429,303	694,161
Year five	610,189	497,552
Prior	2,046,034	1,773,967
Revolving Loans Amortized Cost Basis	1	60,493
Loans and leases	7,234,759	6,621,982
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	1,033
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	1,033
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	270,568	388,955
Year two	328,885	362,688
Year three	276,754	349,855
Year four	223,742	325,422
Year five	236,051	110,956
Prior	95,858	90,517
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,431,858	1,628,393
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2,675
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	41
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	2,634
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Commercial Portfolio Segment [Member] | Warehouse lending
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	0
Prior	0	0
Revolving Loans Amortized Cost Basis	118,478	641,976
Loans and leases	118,478	641,976
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Commercial Portfolio Segment [Member] | Pass | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,998,598	5,154,781
Year two	4,377,097	1,952,158
Year three	1,434,709	965,975
Year four	765,133	792,977
Year five	630,440	593,460
Prior	981,671	780,200
Revolving Loans Amortized Cost Basis	5,629,505	5,670,532
Loans and leases	15,817,153	15,910,083
Commercial Portfolio Segment [Member] | Pass | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	11,188	19,659
Year two	1,223	3,901
Year three	0	9,424
Year four	1,374	14,413
Year five	7,776	5,163
Prior	43,633	55,553
Revolving Loans Amortized Cost Basis	1,395,893	1,551,250
Loans and leases	1,461,087	1,659,363
Commercial Portfolio Segment [Member] | Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,606,944	3,420,635
Year two	3,505,510	2,246,672
Year three	1,940,429	1,556,185
Year four	1,330,879	1,605,869
Year five	1,268,342	1,058,730
Prior	3,252,414	2,681,052
Revolving Loans Amortized Cost Basis	167,848	97,832
Loans and leases	13,072,366	12,666,975
Commercial Portfolio Segment [Member] | Pass | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,214,619	1,992,980
Year two	1,913,835	1,057,705
Year three	1,020,778	507,065
Year four	419,684	694,066
Year five	609,830	444,564
Prior	1,996,593	1,748,337
Revolving Loans Amortized Cost Basis	1	51,655
Loans and leases	7,175,340	6,496,372
Commercial Portfolio Segment [Member] | Pass | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	270,568	388,641
Year two	321,562	345,792
Year three	268,145	331,419
Year four	214,395	308,441
Year five	211,682	98,874
Prior	76,550	83,264
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,362,902	1,556,431
Commercial Portfolio Segment [Member] | Pass | Warehouse lending
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	0
Prior	0	0
Revolving Loans Amortized Cost Basis	118,478	641,976
Loans and leases	118,478	641,976
Commercial Portfolio Segment [Member] | Special mention | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	13,863	104,277
Year two	87,572	15,598
Year three	75,247	21,168
Year four	33,537	263
Year five	11,929	14,370
Prior	18,921	7,770
Revolving Loans Amortized Cost Basis	71,822	40,142
Loans and leases	312,891	203,588
Commercial Portfolio Segment [Member] | Special mention | 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	0
Prior	0	0
Revolving Loans Amortized Cost Basis	75,025	80,476
Loans and leases	75,025	80,476
Commercial Portfolio Segment [Member] | Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	825	21,878
Year two	957	8,995
Year three	8,044	7,264
Year four	31,549	37,570
Year five	23,593	47,419
Prior	51,125	66,652
Revolving Loans Amortized Cost Basis	1,204	1,000
Loans and leases	117,297	190,778
Commercial Portfolio Segment [Member] | Special mention | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	37,677
Year two	0	0
Year three	0	0
Year four	9,251	95
Year five	359	40,307
Prior	36,135	726
Revolving Loans Amortized Cost Basis	0	8,838
Loans and leases	45,745	87,643
Commercial Portfolio Segment [Member] | Special mention | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	1,436	185
Year three	1,589	0
Year four	0	11,965
Year five	10,642	6,775
Prior	6,850	25
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	20,517	18,950
Commercial Portfolio Segment [Member] | Substandard | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	49,664	28,203
Year two	114,769	11,704
Year three	25,383	69,954
Year four	35,778	36,604
Year five	44,531	70,634
Prior	19,772	16,852
Revolving Loans Amortized Cost Basis	88,247	41,917
Loans and leases	378,144	275,868
Commercial Portfolio Segment [Member] | Substandard | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	3,901	0
Year three	0	0
Year four	0	1,491
Year five	1,330	0
Prior	896	0
Revolving Loans Amortized Cost Basis	90,723	80,312
Loans and leases	96,850	81,803
Commercial Portfolio Segment [Member] | Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	23,411	519
Year two	17,455	2,459
Year three	16,681	216
Year four	15,426	31,163
Year five	37,360	47,021
Prior	48,499	57,997
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	158,832	139,375
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	382
Year four	368	0
Year five	0	12,681
Prior	13,306	24,904
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	13,674	37,967
Commercial Portfolio Segment [Member] | Substandard | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	314
Year two	5,887	16,711
Year three	7,020	18,436
Year four	9,347	5,016
Year five	13,727	5,307
Prior	12,458	7,228
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	48,439	53,012
Commercial Portfolio Segment [Member] | Doubtful | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		0
Year two		0
Year three		0
Year four		1
Year five		0
Prior		0
Revolving Loans Amortized Cost Basis		3,255
Loans and leases		3,256
Commercial Portfolio Segment [Member] | Doubtful | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		0
Year two		0
Year three		0
Year four		1
Year five		0
Prior		34
Revolving Loans Amortized Cost Basis		0
Loans and leases		35
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	666,706	2,042,000
Year two	2,037,249	2,399,022
Year three	2,318,570	960,281
Year four	905,191	454,877
Year five	458,344	126,240
Prior	2,277,987	2,409,520
Revolving Loans Amortized Cost Basis	1,149,359	1,268,535
Loans and leases	9,813,406	9,660,475
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	5,825
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	2,885
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	286
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	203
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	87
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	10
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	2,354
Consumer Portfolio Segment [Member] | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	608,081	1,965,372
Year two	1,965,438	2,304,919
Year three	2,232,037	901,353
Year four	853,554	424,742
Year five	435,362	94,152
Prior	2,133,979	2,272,882
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	8,228,451	7,963,420
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	351
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	348
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Consumer Portfolio Segment [Member] | Residential | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	146,015	527,408
Year two	783,183	954,568
Year three	1,080,117	469,518
Year four	439,900	160,596
Year five	152,423	28,361
Prior	927,801	997,409
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	3,529,439	3,137,860
Consumer Portfolio Segment [Member] | Residential | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	320,705	963,026
Year two	774,244	946,339
Year three	788,042	311,295
Year four	303,391	111,913
Year five	106,743	43,684
Prior	683,795	689,771
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	2,976,920	3,066,028
Consumer Portfolio Segment [Member] | Residential | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	128,325	381,515
Year two	307,265	350,671
Year three	304,316	103,999
Year four	95,158	62,365
Year five	48,146	18,451
Prior	336,117	384,687
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,219,327	1,301,688
Consumer Portfolio Segment [Member] | Residential | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	11,714	40,959
Year two	48,750	49,648
Year three	50,865	14,484
Year four	14,916	5,836
Year five	11,133	2,357
Prior	122,544	138,107
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	259,922	251,391
Consumer Portfolio Segment [Member] | Residential | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,322	52,464
Year two	51,996	3,693
Year three	8,697	2,057
Year four	189	84,032
Year five	116,917	1,299
Prior	63,722	62,908
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	242,843	206,453
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	56,588	73,888
Year two	69,846	90,440
Year three	83,440	53,579
Year four	49,063	21,441
Year five	19,041	29,650
Prior	143,176	136,025
Revolving Loans Amortized Cost Basis	1,111,892	1,228,084
Loans and leases	1,533,046	1,633,107
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2,396
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	2,312
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	81
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	0
Consumer Portfolio Segment [Member] | Home equity | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	20,653	25,475
Year two	27,163	35,129
Year three	34,930	25,612
Year four	25,418	7,578
Year five	7,914	12,545
Prior	59,074	55,352
Revolving Loans Amortized Cost Basis	409,133	465,318
Loans and leases	584,285	627,009
Consumer Portfolio Segment [Member] | Home equity | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	20,009	26,743
Year two	22,878	35,178
Year three	31,037	17,621
Year four	15,529	8,111
Year five	5,887	7,765
Prior	35,482	32,270
Revolving Loans Amortized Cost Basis	351,533	398,692
Loans and leases	482,355	526,380
Consumer Portfolio Segment [Member] | Home equity | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	13,299	18,396
Year two	15,757	16,679
Year three	14,689	8,175
Year four	5,940	3,635
Year five	3,418	7,614
Prior	31,292	30,060
Revolving Loans Amortized Cost Basis	250,737	259,646
Loans and leases	335,132	344,205
Consumer Portfolio Segment [Member] | Home equity | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,083	2,848
Year two	3,261	3,068
Year three	1,875	1,520
Year four	1,281	1,456
Year five	1,266	1,163
Prior	11,419	13,607
Revolving Loans Amortized Cost Basis	66,901	76,614
Loans and leases	88,086	100,276
Consumer Portfolio Segment [Member] | Home equity | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	544	426
Year two	787	386
Year three	909	651
Year four	895	661
Year five	556	563
Prior	5,909	4,736
Revolving Loans Amortized Cost Basis	33,588	27,814
Loans and leases	43,188	35,237
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,037	2,740
Year two	1,965	3,663
Year three	3,093	5,349
Year four	2,574	8,694
Year five	3,941	2,438
Prior	832	613
Revolving Loans Amortized Cost Basis	37,467	40,451
Loans and leases	51,909	63,948
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	3,078
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff	225
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	286
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	203
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff	2,354
Consumer Portfolio Segment [Member] | Consumer Loan | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	345	495
Year two	434	218
Year three	1,968	544
Year four	336	1,045
Year five	509	247
Prior	134	56
Revolving Loans Amortized Cost Basis	21,869	19,196
Loans and leases	25,595	21,801
Consumer Portfolio Segment [Member] | Consumer Loan | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,172	888
Year two	709	2,624
Year three	565	1,959
Year four	838	2,494
Year five	1,102	941
Prior	447	364
Revolving Loans Amortized Cost Basis	4,144	12,218
Loans and leases	8,977	21,488
Consumer Portfolio Segment [Member] | Consumer Loan | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	406	977
Year two	588	603
Year three	383	2,480
Year four	1,143	4,238
Year five	1,826	1,041
Prior	154	118
Revolving Loans Amortized Cost Basis	9,644	6,107
Loans and leases	14,144	15,564
Consumer Portfolio Segment [Member] | Consumer Loan | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	55	211
Year two	143	117
Year three	123	337
Year four	246	801
Year five	461	173
Prior	67	54
Revolving Loans Amortized Cost Basis	1,203	2,223
Loans and leases	2,298	3,916
Consumer Portfolio Segment [Member] | Consumer Loan | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	59	169
Year two	91	101
Year three	54	29
Year four	11	116
Year five	43	36
Prior	30	21
Revolving Loans Amortized Cost Basis	607	707
Loans and leases	$ 895	$ 1,179

Loans and Leases (Summary Of Th

Loans and Leases (Summary Of The Recorded Investment Of Company's TDRs) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs				$ 194,822
Additional funds committed to borrowers in TDR status				1,724
Specific reserves for TDRs included in the ACL on loans and leases:	$ 574,325	$ 574,325	$ 635,438	594,741	$ 301,187
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDRs included in the ACL on loans and leases:	516,315	516,315	584,493	533,125	257,877
Write-down	0	(10,000)
Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDRs included in the ACL on loans and leases:	58,010	58,010	$ 50,945	61,616	$ 43,310
Write-down	$ (100)	$ (200)
Performing Financial Instruments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs				110,868
Nonperforming Financial Instruments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total recorded investment of TDRs				83,954
Nonperforming Financial Instruments | Troubled Debt Restructures | Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDRs included in the ACL on loans and leases:				14,578
Nonperforming Financial Instruments | Troubled Debt Restructures | Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for TDRs included in the ACL on loans and leases:				$ 3,559

Loans and Leases (Information o

Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		30		82
Recorded Investment	$ 79,267	$ 20,135	$ 146,834	$ 50,582
Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	41,193		84,107
Adjusted interest rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 375		$ 438
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan				5
Commercial Portfolio Segment [Member] | Term extension | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		1		3
Recorded Investment		$ 24		$ 121
Commercial Portfolio Segment [Member] | Combination - Term extension and interest rate reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		3		8
Recorded Investment		$ 322		$ 765
Commercial Portfolio Segment [Member] | Other | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		15		16
Recorded Investment		$ 17,408		$ 40,372
Commercial Portfolio Segment [Member] | Other | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		0		1
Recorded Investment		$ 0		$ 1,157
Consumer Portfolio Segment [Member] | Term extension | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		0		1
Recorded Investment		$ 0		$ 893
Consumer Portfolio Segment [Member] | Combination - Term extension and interest rate reduction | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		1		1
Recorded Investment		$ 124		$ 124
Consumer Portfolio Segment [Member] | Combination - Term extension and interest rate reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		3		14
Recorded Investment		$ 1,515		$ 2,239
Consumer Portfolio Segment [Member] | Other | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		1		7
Recorded Investment		$ 298		$ 3,060
Consumer Portfolio Segment [Member] | Other | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		6		30
Recorded Investment		$ 444		$ 1,777
Consumer Portfolio Segment [Member] | Adjusted interest rate | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans and Leases | loan		0		1
Recorded Investment		$ 0		$ 74

Loans and Leases - Troubled Deb

Loans and Leases - Troubled Debt Restructurings on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 79,267	$ 20,135	$ 146,834	$ 50,582
% of Total Class	0.20%		0.30%
Interest Receivable	$ 200		$ 300
Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 45,708		$ 105,446
% of Total Class	0.30%		0.60%
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 18,521		$ 21,863
% of Total Class	0.10%		0.20%
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 430		$ 806
% of Total Class	0%		0.10%
Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			$ 1,362
% of Total Class			0.10%
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 395		$ 3,144
% of Total Class	0%		0%
Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 14,213		$ 14,213
% of Total Class	0.90%		0.90%
Adjusted interest rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 375		$ 438
Adjusted interest rate | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0		$ 0
Reduced weighted average interest rate	0.30%		0.30%
Adjusted interest rate | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0		$ 0
Adjusted interest rate | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	118		181
Adjusted interest rate | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			0
Adjusted interest rate | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 257		$ 257
Reduced weighted average interest rate	2.30%		2.30%
Adjusted interest rate | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0		$ 0
Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	41,193		84,107
Term extension | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 26,970		$ 65,470
Extended term	1 year 3 months 18 days		1 year 1 month 6 days
Term extension | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 768		$ 3,928
Extended term	9 months 18 days		1 year 10 months 24 days
Term extension | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0		$ 105
Extended term			11 years 6 months
Term extension | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			$ 0
Term extension | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 138		$ 1,287
Extended term	4 years 10 months 24 days		1 year 9 months 18 days
Term extension | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 13,317		$ 13,317
Extended term	4 months 24 days		4 months 24 days
Extended Maturity And Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 18,495		$ 19,016
Extended Maturity And Interest Rate Reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 940		1,253
Reduced weighted average interest rate	2%
Extended term	7 months 6 days
Extended Maturity And Interest Rate Reduction | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 17,247		17,247
Reduced weighted average interest rate	2.40%
Extended term	3 years
Extended Maturity And Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 308		516
Reduced weighted average interest rate	2.50%
Extended term	19 years 7 months 6 days
Extended Maturity And Interest Rate Reduction | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			0
Extended Maturity And Interest Rate Reduction | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0		0
Extended Maturity And Interest Rate Reduction | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	18,304		29,820
Extended Maturity and Interest Rate Reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 17,798		$ 29,314
Reduced weighted average interest rate			1.80%
Extended term	1 year 2 months 12 days		1 year 4 months 24 days
Payment deferrals term	2 years
Extended Maturity and Interest Rate Reduction | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 506		$ 506
Reduced weighted average interest rate			2.40%
Extended term	6 months		3 years
Payment deferrals term	6 months
Extended Maturity and Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 0		$ 0
Reduced weighted average interest rate			2.10%
Extended term			16 years 9 months 18 days
Extended Maturity and Interest Rate Reduction | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			$ 0
Extended Maturity and Interest Rate Reduction | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity and Interest Rate Reduction | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	4		12,557
Payment Delay | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		9,409
Payment Delay | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		182
Payment Delay | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	4		4
Payment Delay | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			1,362
Payment Delay | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		1,600
Payment Delay | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity, Interest Rate Reductions And Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	896		896
Extended Maturity, Interest Rate Reductions And Payment Delay | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity, Interest Rate Reductions And Payment Delay | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity, Interest Rate Reductions And Payment Delay | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity, Interest Rate Reductions And Payment Delay | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment			0
Extended Maturity, Interest Rate Reductions And Payment Delay | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	0		0
Extended Maturity, Interest Rate Reductions And Payment Delay | Asset-based
Financing Receivable, Troubled Debt Restructuring [Line Items]
Recorded Investment	$ 896		$ 896
Reduced weighted average interest rate	10.80%		10.80%
Extended term	4 years 7 months 6 days		4 years 7 months 6 days

Loans and Leases - Aging of Loa

Loans and Leases - Aging of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	$ 214,065	$ 197,441
Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	146,834
Non-accrual	75,540
Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	71,294
30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	0
60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	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
Commercial non-mortgage | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	105,446
Non-accrual	53,833
Commercial non-mortgage | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	51,613
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
Commercial non-mortgage | 60-89 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	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
Commercial real estate | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	21,863
Non-accrual	17,428
Commercial real estate | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	4,435
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
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
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
Equipment financing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,362
Non-accrual	0
Equipment financing | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,362
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	3,144
Non-accrual	2,817
Residential | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	327
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	806
Non-accrual	566
Home equity | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	240
Home equity | 30-59 Days Past Due and Accruing | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	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
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
Asset-based | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,213
Non-accrual	896
Asset-based | Current | Aging Loan Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,317
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

Loans and Leases (Details)

Loans and Leases (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Adjusted interest rate | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted average interest rate	0.30%	0.30%
Adjusted interest rate | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Reduced weighted average interest rate	2.30%	2.30%
Term extension | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	1 year 3 months 18 days	1 year 1 month 6 days
Term extension | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	9 months 18 days	1 year 10 months 24 days
Term extension | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		11 years 6 months
Term extension | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	4 years 10 months 24 days	1 year 9 months 18 days
Payment Deferral | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		6 months
Payment Deferral | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		3 months 18 days
Payment Deferral | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment deferrals term	4 months 24 days	4 months 24 days
Payment Deferral | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		6 months
Payment Deferral | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		1 year
Extended Maturity and Interest Rate Reduction | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	1 year 2 months 12 days	1 year 4 months 24 days
Reduced weighted average interest rate		1.80%
Payment deferrals term	2 years
Extended Maturity and Interest Rate Reduction | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term	6 months	3 years
Reduced weighted average interest rate		2.40%
Payment deferrals term	6 months
Extended Maturity and Interest Rate Reduction | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		16 years 9 months 18 days
Reduced weighted average interest rate		2.10%
Extended Maturity And Payment Deferral | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		1 year 1 month 6 days
Payment deferrals term		1 year 10 months 24 days
Extended Maturity And Payment Deferral | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extended term		6 months
Payment deferrals term		6 months

Transfers and Servicing of Fi_3

Transfers and Servicing of Financial Assets (Loans sold) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage banking activities	$ 42	$ 86	$ 230	$ 616
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Origination fees	7	22	52	194
Mortgage banking activities	42	86	230	616
Consumer Portfolio Segment [Member] | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale	51	26	219	529
Fair value adjustment	(16)	38	(41)	(107)
Proceeds from sale	2,590	1,053	11,250	33,886
Consumer Portfolio Segment [Member] | Loans sold with servicing rights retained
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale	$ 633	$ 147	$ 5,981	$ 30,464

Transfers and Servicing of Fi_4

Transfers and Servicing of Financial Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans not originated for sale			$ 512,622	$ 648,573
Mortgage banking activities	$ 42	$ 86	230	616
Residential
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans not originated for sale	71,500	530,100	512,600	648,600
Commercial
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Mortgage banking activities			700	3,100
Consumer Portfolio Segment [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Mortgage banking activities	42	86	230	616
Consumer Portfolio Segment [Member] | Residential
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights	1,800,000		1,800,000		$ 2,000,000
Loan servicing fees, net	$ 1,200	$ 1,300	$ 3,800	$ 2,900

Transfers and Servicing of Fi_5

Transfers and Servicing of Financial Assets (Servicing Assets at Amortized Cost Roll Forward) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning Balance	$ 8,858	$ 8,592	$ 9,515	$ 9,237
Additions	13	1,627	65	1,892
Amortization	(352)	(382)	(1,061)	(2,151)
Ending Balance	8,519	9,837	8,519	9,837
Business Acquisition [Line Items]
Additions	13	1,627	65	1,892
Sterling
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Additions	0	0	0	859
Business Acquisition [Line Items]
Additions	$ 0	$ 0	$ 0	$ 859

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Roll Forward]
Balance, beginning of period	$ 2,514,104	$ 538,373
Balance, end of period	2,631,465	2,514,104
Sterling
Goodwill [Roll Forward]
Goodwill acquired	143,216	1,939,765
Bend
Goodwill [Roll Forward]
Goodwill acquired	25,561	35,966
interLINK
Goodwill [Roll Forward]
Goodwill acquired	$ 294	$ 0

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Gross Carrying Value And Accumulated Amortization Of Other Intangible Assets) (Detail) - USD ($) $ in Thousands	Jan. 11, 2023	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 301,037	$ 261,037
Accumulated Amortization		89,285	61,695
Net Carrying Amount		211,752	199,342
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		146,037	146,037
Accumulated Amortization		49,871	36,710
Net Carrying Amount		96,166	109,327
Customer relationships (1)
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		151,000	115,000
Accumulated Amortization		38,814	24,985
Net Carrying Amount		112,186	90,015
Customer relationships (1) | interLINK
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life	10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 36,000
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		4,000	0
Accumulated Amortization		600	0
Net Carrying Amount		$ 3,400	$ 0
Noncompete Agreements | interLINK
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	$ 4,000

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jan. 11, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2023	$ 8,617
2024	29,618
2025	25,956
2026	25,565
2027	25,565
Thereafter	$ 96,431
interLINK | Noncompete Agreements
Goodwill and Intangible Assets Disclosure [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		$ 4,000
Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		$ 4,000

Deposits (Summary Of Deposits)

Deposits (Summary Of Deposits) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Non-interest-bearing:
Demand	$ 11,410,063	$ 12,974,975
Interest-bearing:
HSA	8,229,889	7,944,892
Checking	8,826,265	9,237,529
Money market	17,755,198	11,062,652
Savings	6,622,833	8,673,343
Time deposits	7,487,519	4,160,949
Total interest-bearing	48,921,704	41,079,365
Total deposits	60,331,767	54,054,340
Time deposits, money market, and interest-bearing checking obtained through brokers (1)	3,050,332	1,964,873
Aggregate amount of time deposit accounts that exceeded the FDIC limit	3,467,080	1,894,950
Demand deposit overdrafts reclassified as loan balances	9,867	$ 8,721
Money market sweep deposits	$ 5,200,000

Deposits (Scheduled Maturities

Deposits (Scheduled Maturities Of Time Deposits) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deposit Liabilities [Abstract]
Remainder of 2023	$ 3,454,002
2024	3,790,109
2025	137,311
2026	54,969
2027	34,419
Thereafter	16,709
Time deposits	$ 7,487,519	$ 4,160,949

Borrowings (Summary Of Securiti

Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 157,491	$ 282,005
Rate	0.12%	0.11%
Federal funds purchased
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 0	$ 869,825
Rate	0%	4.44%
Securities sold under agreements to repurchase and other borrowings
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 157,491	$ 1,151,830
Rate	0.12%	3.38%

Borrowings (Summary Of Advances

Borrowings (Summary Of Advances Payable To the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Federal Home Loan Bank, Advances, Maturity, Rolling Year [Abstract]
FHLB advances maturing within 1 year, Total Outstanding	$ 1,800,113	$ 5,450,187
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	0	0
FHLB advances maturing after 4 but within 5 years, Total Outstanding	471	252
FHLB advances maturing after 5 years, Total Outstanding	9,634	10,113
Total FHLB advances	$ 1,810,218	$ 5,460,552
Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract]
FHLB advances maturing within 1 year, Weighted Average Contractual Coupon Rate (as a percent)	5.55%	4.40%
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)	0%	0%
FHLB advances maturing after 4 but within 5 years, Weighted Average Contractual Coupon Rate (as a percent)	1.35%	0%
FHLB advances maturing after 5 years, Weighted Average Contractual Coupon Rate (as a percent)	2.07%	2.09%
Federal Home Loan Bank, Advances, Weighted Average Contractual Coupon Rate (as a percent)	5.53%	4.39%
Aggregate carrying value of assets pledged as collateral	$ 20,943,861	$ 13,692,379
Remaining borrowing capacity at FHLB	$ 13,380,838	$ 4,291,326

Borrowings (Long Term Debt) (De

Borrowings (Long Term Debt) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Notes and subordinated debt	$ 1,038,313	$ 1,038,313		$ 1,059,778
Debt issuance cost on senior fixed-rates	(1,516)	(1,516)		(1,824)
Long-term debt	$ 1,050,539	1,050,539		$ 1,073,128
Proceeds from extinguishment of borrowings		$ 698	$ 0
Variable interest rate	8.62%	8.62%		7.69%
LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				2.95%
Senior Notes
Debt Instrument [Line Items]
Discount on senior fixed-rate notes	$ (592)	$ (592)		$ (756)
Senior Notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	4.375%	4.375%
Notes and subordinated debt	$ 132,550	$ 132,550		150,000
Shares repurchased and retired	$ 17,500
Price of senior notes (in dollars per share)	$ 0.96
Proceeds from extinguishment of borrowings	$ 700
Senior Notes | Senior Notes Due 2029
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	4.10%	4.10%
Notes and subordinated debt	$ 329,443	$ 329,443		333,458
Hedge basis adjustment	29,400	29,400		33,500
Subordinated Debt
Debt Instrument [Line Items]
Premium on subordinated fixed-to-floating rate notes	$ 14,334	$ 14,334		15,930
Subordinated Debt | Subordinated Notes Due 2029
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	4%	4%
Notes and subordinated debt	$ 274,000	$ 274,000		274,000
Subordinated Debt | Subordinated Notes Due 2030
Debt Instrument [Line Items]
Senior notes, interest rate (as a percent)	3.875%	3.875%
Notes and subordinated debt	$ 225,000	$ 225,000		225,000
Junior subordinated debt
Debt Instrument [Line Items]
Notes and subordinated debt	77,320	77,320		77,320
Long-term Debt
Debt Instrument [Line Items]
Hedge basis adjustment	$ 29,443	$ 29,443		$ 33,458

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Jan. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Notes and subordinated debt	$ 1,038,313	$ 1,059,778
Sterling
Assets Sold under Agreements to Repurchase [Line Items]
Long-term debt			$ 516,881
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%

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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 8,279,726	$ 7,997,788	$ 8,056,186	$ 3,438,325
Other comprehensive (loss) income before reclassifications	(197,726)	(258,536)	(249,951)	(719,418)
Amounts reclassified from accumulated other comprehensive (loss)	770	2,967	19,132	5,097
Other comprehensive (loss) income, net of tax	(196,956)	(255,569)	(230,819)	(714,321)
Ending Balance	8,199,201	7,826,410	8,199,201	7,826,410
Available For Sale and Transferred Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(644,579)	(445,616)	(631,160)	4,536
Other comprehensive (loss) income before reclassifications	(174,594)	(243,872)	(203,031)	(694,024)
Amounts reclassified from accumulated other comprehensive (loss)	0	1,641	15,018	1,641
Other comprehensive (loss) income, net of tax	(174,594)	(242,231)	(188,013)	(692,383)
Ending Balance	(819,173)	(687,847)	(819,173)	(687,847)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(35,023)	(2,082)	(8,874)	6,070
Other comprehensive (loss) income before reclassifications	(23,132)	(14,416)	(50,473)	(24,099)
Amounts reclassified from accumulated other comprehensive (loss)	421	717	1,613	2,248
Other comprehensive (loss) income, net of tax	(22,711)	(13,699)	(48,860)	(21,851)
Ending Balance	(57,734)	(15,781)	(57,734)	(15,781)
Defined Benefit Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(39,221)	(33,634)	(44,926)	(33,186)
Other comprehensive (loss) income before reclassifications	0	(248)	3,553	(1,295)
Amounts reclassified from accumulated other comprehensive (loss)	349	609	2,501	1,208
Other comprehensive (loss) income, net of tax	349	361	6,054	(87)
Ending Balance	(38,872)	(33,273)	(38,872)	(33,273)
Accumulated Other Comprehensive Income (Loss), Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(718,823)	(481,332)	(684,960)	(22,580)
Other comprehensive (loss) income, net of tax	(196,956)	(255,569)	(230,819)	(714,321)
Ending Balance	$ (915,779)	$ (736,901)	$ (915,779)	$ (736,901)

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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (51,965)	$ (64,069)	$ (180,442)	$ (85,281)
Net of tax	(770)	(2,967)	(19,132)	(5,097)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(421)	(717)	(1,613)	(2,248)
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	156	268	599	837
Net of tax	(421)	(717)	(1,613)	(2,248)
Hedge terminations	(67)	(76)	(242)	(229)
Premium amortization	(510)	(909)	(1,970)	(2,856)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial net loss amortization	(479)	(835)	(1,562)	(1,657)
Other	0	0	(1,869)	0
Defined benefit pension and postretirement benefit plans
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(349)	(609)	(2,501)	(1,208)
Income tax expense	130	226	930	449
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0		5,513	593
Net of tax	0	(1,641)	(15,018)	(1,641)
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 holding (losses)	$ 0	(2,234)	$ (20,531)	$ (2,234)
Income tax expense		$ 593

Regulatory Capital and Restri_3

Regulatory Capital and Restrictions (Information On The Capital Ratios) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Amount	$ 6,048,469		$ 6,048,469		$ 5,822,369
CET1 risk-based capital, Actual Ratio	0.1112		0.1112		0.1071
CET1 risk-based capital, Minimum Requirement Amount	$ 2,447,347		$ 2,447,347		$ 2,446,344
CET1 risk-based capital, Well Capitalized Amount	3,535,056		3,535,056		3,533,608
Total risk-based capital, Actual Amount	$ 7,497,339		$ 7,497,339		$ 7,203,029
Total risk-based capital, Actual Ratio	0.1379		0.1379		0.1325
Total risk-based capital, Capital Requirements, Minimum Amount	$ 4,350,838		$ 4,350,838		$ 4,349,056
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080		0.080		0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 5,438,548		$ 5,438,548		$ 5,436,320
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100		0.100
Tier 1 capital, Actual Amount	$ 6,332,448		$ 6,332,448		$ 6,106,348
Tier 1 capital, Actual Ratio	0.1164		0.1164		0.1123
Tier 1 capital, Capital Requirements, Minimum Amount	$ 3,263,129		$ 3,263,129		$ 3,261,792
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 4,350,838		$ 4,350,838		$ 4,349,056
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 6,332,448		$ 6,332,448		$ 6,106,348
Tier 1 leverage capital ratio, Actual Ratio	0.0883		0.0883		0.0895
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 2,869,002		$ 2,869,002		$ 2,730,212
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	0.040		0.040		0.040
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 3,586,253		$ 3,586,253		$ 3,412,765
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		0.050		0.050
Dividends paid	$ 250,000	$ 250,000	$ 500,000	$ 375,000
Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 risk-based capital, Actual Amount	$ 6,790,765		$ 6,790,765		$ 6,661,504
CET1 risk-based capital, Actual Ratio	0.1251		0.1251		0.1228
CET1 risk-based capital, Minimum Requirement Amount	$ 2,443,048		$ 2,443,048		$ 2,442,058
CET1 risk-based capital, Well Capitalized Amount	3,528,848		3,528,848		3,527,417
Total risk-based capital, Actual Amount	$ 7,365,002		$ 7,365,002		$ 7,165,935
Total risk-based capital, Actual Ratio	0.1357		0.1357		0.1320
Total risk-based capital, Capital Requirements, Minimum Amount	$ 4,343,197		$ 4,343,197		$ 4,341,437
Total risk-based capital, Capital Requirements, Minimum Ratio	0.080		0.080		0.080
Total risk-based capital, Capital Requirements, Well Capitalized Amount	$ 5,428,997		$ 5,428,997		$ 5,426,796
Total risk-based capital, Capital Requirements, Well Capitalized Ratio	0.100		0.100		0.100
Tier 1 capital, Actual Amount	$ 6,790,765		$ 6,790,765		$ 6,661,504
Tier 1 capital, Actual Ratio	0.1251		0.1251		0.1228
Tier 1 capital, Capital Requirements, Minimum Amount	$ 3,257,398		$ 3,257,398		$ 3,256,078
Tier 1 capital, Capital Requirements, Minimum Ratio	0.060		0.060		0.060
Tier 1 capital, Capital Requirements, Well Capitalized Amount	$ 4,343,197		$ 4,343,197		$ 4,341,437
Tier 1 capital, Capital Requirements, Well Capitalized Ratio	0.080		0.080		0.080
Tier 1 leverage capital ratio, Actual Amount	$ 6,790,765		$ 6,790,765		$ 6,661,504
Tier 1 leverage capital ratio, Actual Ratio	0.0948		0.0948		0.0977
Tier 1 leverage capital ratio, Capital Requirements, Minimum Amount	$ 2,866,587		$ 2,866,587		$ 2,727,476
Tier 1 leverage capital ratio, Capital Requirements, Minimum Ratio	0.040		0.040		0.040
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Amount	$ 3,583,234		$ 3,583,234		$ 3,409,345
Tier 1 leverage capital ratio, Capital Requirements, Well Capitalized Ratio	0.050		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		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		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		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		0.065

Variable Interest Entities - Su

Variable Interest Entities - Summary of LIHTC Investments and Commitments (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
Gross investment in LIHTC	$ 921,100		$ 797,453
Accumulated amortization	(123,708)		(69,424)
Net investment in LIHTC investments	797,392		728,029
Unfunded commitments for LIHTC investments	391,896		$ 335,959
Liabilities assumed	$ 120,900	$ 123,400

Variable Interest Entities - Na

Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
Assets	$ 73,130,851		$ 71,277,521
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Liabilities assumed	120,900	$ 123,400
Other Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	179,500		144,900
Unfunded Loan Commitment | Other Non-Marketable Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 299,900		$ 243,900

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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share Reconciliation [Abstract]
Net income	$ 226,475	$ 233,968	$ 682,447	$ 399,532
Less: Preferred stock dividends	4,162	4,162	12,487	11,756
Earnings applicable to common stockholders	222,313	229,806	669,960	387,776
Net income available to common stockholders	222,313	229,806	669,960	387,776
Less: (Loss) earnings allocated to participating securities, basic	2,146	2,128	6,211	3,562
Less: (Loss) earnings allocated to participating securities, diluted	2,146	2,128	6,211	3,562
Earnings applicable to common stockholders	220,167	227,678	663,749	384,214
Earnings applicable to common stockholders	$ 220,167	$ 227,678	$ 663,749	$ 384,214
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average common shares outstanding - basic (in shares)	171,210	173,868	172,233	165,743
Effect of dilutive securities (in shares)	140	76	93	70
Weighted-average common shares outstanding - diluted (in shares)	171,350	173,944	172,326	165,813
Earnings Per Share, Basic and Diluted [Abstract]
Basic (loss) earnings per common share (in dollars per share)	$ 1.29	$ 1.31	$ 3.85	$ 2.32
Diluted (loss) earnings per common share (in shares)	$ 1.28	$ 1.31	$ 3.85	$ 2.32

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restricted stock (due to performance conditions on non-participating shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	96,415	97,294	187,349	330,688

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	$ 8,295,792,000	$ 8,539,724,000
Asset Derivatives, Fair Value, before netting	473,609,000	222,906,000
Asset Derivatives, Fair Value, Less: Master netting agreements	78,044,000	16,129,000
Asset Derivatives, Fair Value, Less: Cash collateral posted	392,408,000	184,095,000
Total derivative instruments, after netting	3,157,000	22,682,000
Liability Derivatives, Notional Amount	13,630,687,000	9,379,322,000
Liability Derivatives, Fair Value	557,268,000	414,499,000
Liability Derivatives, Fair Value, Less: Master netting agreements	78,044,000	16,129,000
Liability Derivatives, Fair Value, Less: Cash collateral posted	0	0
Total derivative instruments, after netting	479,224,000	398,370,000
CME
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Less: Cash collateral posted	6,500,000
Total derivative instruments, after netting	0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	472,969,000	217,246,000
Asset Derivatives, Fair Value, Less: Master netting agreements	78,044,000	16,129,000
Total derivative instruments, after netting	392,408,000	184,095,000
Liability Derivatives, Fair Value	78,044,000	16,129,000
Liability Derivatives, Fair Value, Less: Master netting agreements	78,044,000	16,129,000
Total derivative instruments, after netting	0	0
Designated as Hedging Instrument | Interest rate derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	450,000,000	1,350,000,000
Asset Derivatives, Fair Value	8,000	1,515,000
Liability Derivatives, Notional Amount	5,400,000,000	1,750,000,000
Liability Derivatives, Fair Value	77,384,000	9,632,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	7,845,792,000	7,189,724,000
Asset Derivatives, Fair Value, Total	473,601,000	221,391,000
Liability Derivatives, Notional Amount	8,230,687,000	7,629,322,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement	479,884,000	404,867,000
Not Designated as Hedging Instrument | Interest rate derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	7,580,155,000	7,024,507,000
Asset Derivatives, Fair Value	472,844,000	221,225,000
Liability Derivatives, Notional Amount	7,546,167,000	7,022,844,000
Liability Derivatives, Fair Value	479,766,000	403,952,000
Not Designated as Hedging Instrument | Mortgage Banking Derivatives | RPA-Out
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	1,113,000	3,283,000
Asset Derivatives, Fair Value	8,000	32,000
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	264,524,000	161,934,000
Asset Derivatives, Fair Value	749,000	134,000
Liability Derivatives, Notional Amount	684,520,000	606,478,000
Liability Derivatives, Fair Value	118,000	915,000
Not Designated as Hedging Instrument | Interest Rate Swap, CME
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	100,000,000	2,700,000,000
Liability Derivatives, Notional Amount	400,000,000	0
Not Designated as Hedging Instrument | Credit Risk Contract | RPA-Out
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	206,400,000	125,600,000
Not Designated as Hedging Instrument | Credit Risk Contract | RPA-In
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	667,600,000	559,200,000
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Other commitment	$ 2,200,000	$ 2,400,000

Derivative Financial Instrume_4

Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Asset Derivatives, Fair Value, Less: Master netting agreements	$ 78,044	$ 16,129
Asset derivatives	3,157	22,682
Liability Derivatives, Fair Value, Less: Master netting agreements	78,044	16,129
Liability derivatives	479,224	398,370
Hedge Accounting Positions
Derivative [Line Items]
Asset Derivatives, Fair Value	472,969	217,246
Asset Derivatives, Fair Value, Less: Master netting agreements	78,044	16,129
Asset derivatives	392,408	184,095
Asset derivatives, amounts not offset	2,517	17,022
Asset derivatives, net amounts	2,538	17,392
Liability Derivatives, Fair Value	78,044	16,129
Liability Derivatives, Fair Value, Less: Master netting agreements	78,044	16,129
Liability derivatives	0	0
Liability derivatives, amounts not offset	0	0
Liability derivatives, net amounts	$ 6,442	$ 1,545

Derivative Financial Instrume_5

Derivative Financial Instruments (Income Statement Effect) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 3,030	$ 9,259		$ 29,864
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)			$ (2,535)
Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,474	6,032	(2,407)	25,291
Mortgage Banking Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	4	31	(24)	(47)
Other | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	1,552	3,196	(104)	4,620
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(4,265)	(559)	(5,900)	3,091
Cash Flow Hedging | Interest Rate Derivatives | Operating Expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	68	76	243	229
Cash Flow Hedging | Interest Rate Derivatives | Other Income | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(4,197)	(483)	(5,657)	3,320
Fair Value Hedging [Member] | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(1,248)	0	(2,216)	0
Fair Value Hedging [Member] | Operating Expense | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(6,145)	0	(5,870)	0
Fair Value Hedging [Member] | Operating Expense | Designated as Hedging Instrument | Long-term Debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 7,393	$ 0	$ 8,086	$ 0

Derivative Financial Instrume_6

Derivative Financial Instruments Impact of Fair Value Hedging Adjustment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Long-term Debt
Derivative Instruments, Gain (Loss) [Line Items]
Hedge basis adjustment	$ 29,443	$ 33,458
Hedged Liability, Fair Value Hedge	329,443	333,458
Notional Amount of Hedged Item	300,000	300,000
Deposits
Derivative Instruments, Gain (Loss) [Line Items]
Hedge basis adjustment	(5,870)	0
Hedged Liability, Fair Value Hedge	394,130	0
Notional Amount of Hedged Item	$ 400,000	$ 0

Derivative Financial Instrume_7

Derivative Financial Instruments (AOCI Related to Cash Flow Hedges) (Narrative) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Unamortized balance	$ 0.9
Maximum length of time over which forecasted transactions are hedged	4 years 4 months 24 days
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ 0.1
Remaining unamortized gain (loss) on termination of cash flow hedges	(0.1)
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Estimate of amount to be reclassified from AOCL	$ 42

Derivative Financial Instrume_8

Derivative Financial Instruments (Counterparty Credit Risk Narrative) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 392,408	$ 184,095
Maximum exposure	600
Debit (credit) valuation adjustment	10,400	$ 8,400
Cash and Due from Banks
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	398,900
Valuation, Market Approach
Derivative [Line Items]
Maximum exposure	102,400
CME
Derivative [Line Items]
Derivative instrument asset, Amount Offset	$ 6,500

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Jan. 11, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Remaining unfunded commitment				$ 1,724,000
Broker dealer deposit program, fair value	$ 2,500,000,000	$ 2,500,000,000
Unused commitments to extend credit	11,589,520,000	11,589,520,000		11,671,663,000
Loans transferred to held for sale, fair value	45,400,000	45,400,000		0
Loans in process of foreclosure	16,300,000	16,300,000
Value under fair value options	837,000	837,000		1,991,000
Write-ups due to observable price changes	900,000	1,200,000
Write-downs due to impairment	(1,000,000)	(1,000,000)
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	3,300,000	3,300,000		2,300,000
Rabbi Trust
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	10,300,000	10,300,000		10,000,000
Alternative investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	29,900,000	29,900,000		82,700,000
Carrying amount of alternative investments	900,000	900,000		400,000
Remaining unfunded commitment	0	0
Write-down	300,000	500,000
Alternative investments carrying amount	31,300,000	31,300,000		89,200,000
Alternative investments | Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unused commitments to extend credit	50,000,000	50,000,000		42,800,000
Unused commitments to extend credit, fair value	$ 4,800,000	$ 4,800,000		$ 5,900,000

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Option, Disclosures) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Originated loans held for sale, fair value	$ 837	$ 1,991
Originated loans held for sale, unpaid principal balance	46,267	1,991
Originated loans held for sale, difference	(482)	360
loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Originated loans held for sale, unpaid principal balance	$ 1,319	$ 1,631

Fair Value Measurements (Fair_2

Fair Value Measurements (Fair Value Unobservable Inputs) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) holding
Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration | $	$ 4,231
Re-sign Broker Dealers | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration | $	4,826
Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration | $	11,568
Deposit Program Growth | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration | $	$ 12,500
Probability of Achievement | Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	0.990
Probability of Achievement | Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	1
Payment Term (in years) | Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Payment Term (in years)	2 years 1 month 17 days
Payment Term (in years) | Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Payment Term (in years)	1 year 3 months
Discount Rate | Re-sign Broker Dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	0.0640
Discount Rate | Deposit Program Growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent Consideration, Measurement Input | holding	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	Sep. 30, 2023	Dec. 31, 2022
Financial Assets:
Total available-for-sale securities	$ 7,653,391	$ 7,892,697
Asset derivatives	3,157	22,682
Value under fair value options	837	1,991
Financial Liabilities:
Liability derivatives	479,224	398,370
U.S. Treasury notes
Financial Assets:
Total available-for-sale securities	387,021	717,040
Government agency debentures
Financial Assets:
Total available-for-sale securities	248,536	258,374
Municipal bonds and notes
Financial Assets:
Total available-for-sale securities	1,523,322	1,633,202
Agency CMO
Financial Assets:
Total available-for-sale securities	49,905	59,965
Agency MBS
Financial Assets:
Total available-for-sale securities	2,252,635	2,158,024
Agency CMBS
Financial Assets:
Total available-for-sale securities	1,755,131	1,406,486
Non-agency CMBS
Financial Assets:
Total available-for-sale securities	786,602	896,640
CLO
Financial Assets:
Total available-for-sale securities		2,107
Corporate debt securities
Financial Assets:
Total available-for-sale securities	601,582	704,412
Private label MBS
Financial Assets:
Total available-for-sale securities	39,878	44,249
Other
Financial Assets:
Total available-for-sale securities	8,779	12,198
Fair Value, Recurring
Financial Assets:
Total available-for-sale securities	7,653,391	7,892,697
Alternative investments	32,206	89,678
Total financial assets	8,172,880	8,219,375
Financial Liabilities:
Liability derivatives	557,268	414,499
Contingent consideration	15,799
Liabilities, Fair Value Disclosure	573,067
Fair Value, Recurring | Level 1
Financial Assets:
Total available-for-sale securities	387,021	717,040
Alternative investments	891	430
Total financial assets	401,462	729,652
Financial Liabilities:
Liability derivatives	64	843
Contingent consideration	0
Liabilities, Fair Value Disclosure	64
Fair Value, Recurring | Level 2
Financial Assets:
Total available-for-sale securities	7,266,370	7,175,657
Alternative investments	0	0
Total financial assets	7,740,103	7,400,475
Financial Liabilities:
Liability derivatives	557,204	413,656
Contingent consideration	0
Liabilities, Fair Value Disclosure	557,204
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	15,799
Liabilities, Fair Value Disclosure	15,799
Fair Value, Recurring | Derivative instruments
Financial Assets:
Asset derivatives	473,609	222,906
Fair Value, Recurring | Derivative instruments | Level 1
Financial Assets:
Asset derivatives	713	79
Fair Value, Recurring | Derivative instruments | Level 2
Financial Assets:
Asset derivatives	472,896	222,827
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	837	1,991
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	837	1,991
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	12,837	12,103
Fair Value, Recurring | Investments Held In Rabbi Trust | Level 1
Financial Assets:
Other assets	12,837	12,103
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 | U.S. Treasury notes
Financial Assets:
Total available-for-sale securities	387,021	717,040
Fair Value, Recurring | U.S. Treasury notes | Level 1
Financial Assets:
Total available-for-sale securities	387,021	717,040
Fair Value, Recurring | U.S. Treasury notes | Level 2
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | U.S. Treasury notes | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | Government agency debentures
Financial Assets:
Total available-for-sale securities	248,536	258,374
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	248,536	258,374
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	1,523,322	1,633,202
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	1,523,322	1,633,202
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	49,905	59,965
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	49,905	59,965
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	2,252,635	2,158,024
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	2,252,635	2,158,024
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	1,755,131	1,406,486
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	1,755,131	1,406,486
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	786,602	896,640
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	786,602	896,640
Fair Value, Recurring | Non-agency CMBS | Level 3
Financial Assets:
Total available-for-sale securities	0	0
Fair Value, Recurring | CLO
Financial Assets:
Total available-for-sale securities		2,107
Fair Value, Recurring | CLO | Level 1
Financial Assets:
Total available-for-sale securities		0
Fair Value, Recurring | CLO | Level 2
Financial Assets:
Total available-for-sale securities		2,107
Fair Value, Recurring | CLO | Level 3
Financial Assets:
Total available-for-sale securities		0
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Total available-for-sale securities	601,582	704,412
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	601,582	704,412
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	39,878	44,249
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	39,878	44,249
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	8,779	12,198
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	8,779	12,198
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	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 5,675,674		$ 5,761,453
Mortgage servicing assets, Carrying Amount	8,519	$ 8,858	9,515	$ 9,837	$ 8,592	$ 9,237
Fair Value, Nonrecurring | Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,172,731		839,943
Held-to-maturity investment securities	6,875,772		6,564,697
Loans and leases, net	49,452,708		49,169,685
Securities sold under agreements to repurchase and other borrowings	157,491		1,151,830
FHLB advances	1,810,218		5,460,552
Long-term debt	1,050,539		1,073,128
Fair Value, Nonrecurring | Reported Value Measurement | Deposits Liabilities, other than time deposits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	52,844,248		49,893,391
Fair Value, Nonrecurring | Reported Value Measurement | Time Deposits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	7,487,519		4,160,949
Fair Value, Nonrecurring | Reported Value Measurement | Residential
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing assets, Carrying Amount	8,519		9,515
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,172,731		839,943
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	5,675,674		5,761,453
Securities sold under agreements to repurchase and other borrowings	157,474		1,151,797
FHLB advances	1,810,810		5,459,218
Long-term debt	995,176		1,001,779
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net	47,196,492		47,604,463
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	52,844,248		49,893,391
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Time Deposits | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits	7,452,837		4,091,979
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	$ 24,822		$ 27,043

Retirement Benefit Plans (Detai

Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected long-term rate of return	6%		6%		5.50%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	2,164	1,441	6,586	4,198
Expected return on plan assets	(3,435)	(3,669)	(8,833)	(11,006)
Amortization of actuarial loss (gain)	1,153	821	3,585	1,667
Net periodic benefit cost (income)	(118)	(1,407)	1,338	(5,141)
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	48	17	162	49
Expected return on plan assets	0	0	0	0
Amortization of actuarial loss (gain)	2	7	5	20
Net periodic benefit cost (income)	50	24	167	69
OPEB
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	9	20	24
Interest cost	263	194	906	551
Expected return on plan assets	0	0	0	0
Amortization of actuarial loss (gain)	(676)	7	(2,028)	(30)
Net periodic benefit cost (income)	$ (407)	$ 210	$ (1,102)	$ 545

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jan. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Deposits	$ 60,331,767	$ 54,054,340
Goodwill	$ 2,631,465	$ 2,514,104	$ 2,514,104			$ 538,373
Sterling
Segment Reporting Information [Line Items]
Goodwill				$ 1,914,204	$ 1,900,000
Commercial Banking | Sterling
Segment Reporting Information [Line Items]
Goodwill				1,700,000
Consumer Banking | Sterling
Segment Reporting Information [Line Items]
Goodwill				$ 200,000
HSA Bank | Bend
Segment Reporting Information [Line Items]
Goodwill					$ 35,700

Segment Reporting (Operating Re

Segment Reporting (Operating Results and Total Assets Reportable Segments) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Goodwill	$ 2,631,465	$ 2,514,104	$ 2,631,465	$ 2,514,104	$ 2,514,104	$ 538,373
Assets	73,130,851		73,130,851		71,277,521
Net interest income	587,136	551,003	1,766,248	1,431,911
Non-interest income	90,382	113,636	250,522	338,604
Non-interest expense	362,578	330,071	1,039,134	1,048,083
Pre-tax, pre-provision net revenue	314,940	334,568	977,636	722,432
Provision (benefit) for credit losses	36,500	36,531	114,747	237,619
Income before income taxes	278,440	298,037	862,889	484,813
Income tax expense	51,965	64,069	180,442	85,281
Net income	226,475	233,968	682,447	399,532
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Goodwill	2,029,204		2,029,204		1,904,291
Assets	42,802,857		42,802,857		44,380,582
Net interest income	391,386	333,554	1,159,306	954,044
Non-interest income	30,605	40,497	98,257	128,670
Non-interest expense	110,306	102,415	329,397	294,375
Pre-tax, pre-provision net revenue	311,685	271,636	928,166	788,339
Provision (benefit) for credit losses	39,477	33,341	109,994	238,054
Income before income taxes	272,208	238,295	818,172	550,285
Income tax expense	68,324	59,574	205,361	133,966
Net income	203,884	178,721	612,811	416,319
Operating Segments | HSA Bank
Segment Reporting Information [Line Items]
Goodwill	57,485		57,485		57,779
Assets	118,313		118,313		122,729
Net interest income	77,669	58,567	224,820	152,702
Non-interest income	20,799	25,842	67,889	79,352
Non-interest expense	39,870	36,725	126,213	110,674
Pre-tax, pre-provision net revenue	58,598	47,684	166,496	121,380
Provision (benefit) for credit losses	0	0	0	0
Income before income taxes	58,598	47,684	166,496	121,380
Income tax expense	15,822	12,779	44,954	32,530
Net income	42,776	34,905	121,542	88,850
Operating Segments | Consumer Banking
Segment Reporting Information [Line Items]
Goodwill	544,776		544,776		552,034
Assets	10,803,140		10,803,140		10,625,334
Net interest income	195,315	195,748	610,353	511,712
Non-interest income	26,886	33,842	81,722	92,541
Non-interest expense	105,703	109,588	321,462	312,464
Pre-tax, pre-provision net revenue	116,498	120,002	370,613	291,789
Provision (benefit) for credit losses	(3,638)	(1,989)	(1,085)	(5,906)
Income before income taxes	120,136	121,991	371,698	297,695
Income tax expense	31,716	31,718	98,128	77,352
Net income	88,420	90,273	273,570	220,343
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Goodwill	0		0		0
Assets	19,406,541		19,406,541		$ 16,148,876
Net interest income	(77,234)	(36,866)	(228,231)	(186,547)
Non-interest income	12,092	13,455	2,654	38,041
Non-interest expense	106,699	81,343	262,062	330,570
Pre-tax, pre-provision net revenue	(171,841)	(104,754)	(487,639)	(479,076)
Provision (benefit) for credit losses	661	5,179	5,838	5,471
Income before income taxes	(172,502)	(109,933)	(493,477)	(484,547)
Income tax expense	(63,897)	(40,002)	(168,001)	(158,567)
Net income	$ (108,605)	$ (69,931)	$ (325,476)	$ (325,980)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 58,392	$ 70,096	$ 179,596	$ 205,821
Non-interest income	90,382	113,636	250,522	338,604
Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	41,005	50,807	131,859	150,019
Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,274	5,623	13,024	16,198
Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,254	11,419	21,232	33,260
Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,859	2,247	13,481	6,344
Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31,990
Non-interest income		43,540	70,926	132,783
Operating Segments | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12,191	15,868	37,553	46,679
Non-interest income	30,605	40,497	98,257	128,670
Operating Segments | Commercial Banking | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,056	7,573	16,028	21,905
Operating Segments | Commercial Banking | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,274	5,623	13,024	16,198
Operating Segments | Commercial Banking | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,861	2,672	8,501	8,576
Operating Segments | Commercial Banking | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	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	18,414
Non-interest income		24,629	60,704	81,991
Operating Segments | HSA Bank
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	20,799	25,842	67,889	79,352
Non-interest income	20,799	25,842	67,889	79,352
Operating Segments | HSA Bank | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	19,573	24,008	62,651	74,091
Operating Segments | HSA Bank | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating Segments | HSA Bank | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating Segments | HSA Bank | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,226	1,834	5,238	5,261
Operating Segments | HSA Bank | 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	0	0
Operating Segments | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	23,185	27,897	70,299	78,846
Non-interest income	26,886	33,842	81,722	92,541
Operating Segments | Consumer Banking | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	15,251	18,728	52,456	53,057
Operating Segments | Consumer Banking | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Operating Segments | Consumer Banking | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,393	8,756	12,746	24,706
Operating Segments | Consumer Banking | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,541	413	5,097	1,083
Operating Segments | Consumer Banking | Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,701
Non-interest income		5,945	11,423	13,695
Corporate, Non-Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,217	489	3,855	944
Non-interest income	12,092	13,455	2,654	38,041
Corporate, Non-Segment | Deposit service fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,125	498	724	966
Corporate, Non-Segment | Loan and lease related fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Corporate, Non-Segment | Wealth and investment services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	(9)	(15)	(22)
Corporate, Non-Segment | Other non interest income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,092	0	3,146	0
Corporate, Non-Segment | Non-interest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 9,875
Non-interest income		$ 12,966	$ (1,201)	$ 37,097

Commitments and Contingencies_2

Commitments and Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 11,589,520	$ 11,671,663
Standby letter of credit
Loss Contingencies [Line Items]
Unused commitments to extend credit	402,120	380,655
Commercial letter of credit
Loss Contingencies [Line Items]
Unused commitments to extend credit	56,464	53,512
Commitments to extend credit
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 11,130,936	$ 11,237,496

Commitments and Contingencies_3

Commitments and Contingencies (Reserve for Unfunded Commitments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023	May 22, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Proposed annual rate			0.125%
Forecast
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Estimated Special Assessment Charge	$ 44,000
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		$ 23,000		$ 27,700

Business Combinations and Asset

Business Combinations and Asset Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Schedule of Restructuring Reserve by Type of Cost [Line Items]
Accrued severance and other benefits	$ 19,589	$ 33,017	$ 19,589	$ 33,017	$ 26,944	$ 37,945	$ 42,218	$ 10,835
Strategic initiative charges	17,557	840	25,741	53,323
Payments for Restructuring	(24,746)	(10,032)	(36,284)	(26,827)
Adjustments	(166)	(9)	(7,813)	(4,314)
Employee Severance [Member]
Schedule of Restructuring Reserve by Type of Cost [Line Items]
Accrued severance and other benefits	5,589	15,313	5,589	15,313	3,169	7,583	24,514	10,835
Strategic initiative charges	3,557	840	11,741	35,619
Payments for Restructuring	(971)	(10,032)	(12,509)	(26,827)
Adjustments	(166)	(9)	(1,226)	(4,314)
Occupancy
Schedule of Restructuring Reserve by Type of Cost [Line Items]
Accrued severance and other benefits	14,000	17,704	14,000	17,704	$ 23,775	$ 30,362	$ 17,704	$ 0
Strategic initiative charges	14,000	0	14,000	17,704
Payments for Restructuring	(23,775)	0	(23,775)	0
Adjustments	$ 0	$ 0	$ (6,587)	$ 0