Wintrust Financial (WTFC) 10-Q 9 May 23 2023 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 28, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-35077
Entity Registrant Name	WINTRUST FINANCIAL CORP
Entity Incorporation, State or Country Code	IL
Entity Tax Identification Number	36-3873352
Entity Address, Address Line One	9700 W. Higgins Road, Suite 800
Entity Address, City or Town	Rosemont
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60018
City Area Code	847
Local Phone Number	939-9000
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 (in shares)		61,192,818
Entity Central Index Key	0001015328
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock, no par value
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	WTFC
Security Exchange Name	NASDAQ
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, no par value
Entity Information [Line Items]
Title of 12(b) Security	Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, no par value
Trading Symbol	WTFCM
Security Exchange Name	NASDAQ
6.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E, no par value
Entity Information [Line Items]
Title of 12(b) Security	6.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E, no par value
Trading Symbol	WTFCP
Security Exchange Name	NASDAQ

CONSOLIDATED STATEMENTS OF COND

CONSOLIDATED STATEMENTS OF CONDITION - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Assets
Cash and due from banks	$ 445,928	$ 490,908	$ 462,516
Federal funds sold and securities purchased under resale agreements	58	58	700,056
Interest-bearing deposits with banks	1,563,578	1,988,719	4,013,597
Available-for-sale securities	3,259,845	3,243,017	2,998,898
Held-to-maturity securities, at amortized cost, net of allowance for credit losses of $463, $488 and $159 at March 31, 2023, December 31, 2022 and March 31, 2022, respectively ($3.0 billion, $2.9 billion and $3.1 billion fair value at March 31, 2023, December 31, 2022 and March 31, 2022, respectively)	3,606,391	3,640,567	3,435,729
Trading account securities	102	1,127	852
Equity securities with readily determinable fair value	111,943	110,365	92,689
Federal Home Loan Bank and Federal Reserve Bank stock	244,957	224,759	136,163
Brokerage customer receivables	16,042	16,387	22,888
Mortgage loans held-for-sale, at fair value	302,493	299,935	606,545
Loans, net of unearned income	39,565,471	39,196,485	35,280,547
Allowance for loan losses	(375,798)	(357,448)	(301,168)
Premises, software and equipment, net	760,283	764,798	761,213
Lease investments, net	256,301	253,928	240,656
Accrued interest receivable and other assets	1,413,795	1,391,342	1,066,750
Trade date securities receivable	939,758	921,717	0
Goodwill	653,587	653,524	655,402
Other acquisition-related intangible assets	20,951	22,186	26,699
Total assets	52,873,511	52,949,649	50,250,661
Deposits:
Non-interest-bearing	11,236,083	12,668,160	13,748,918
Interest-bearing	31,482,128	30,234,384	28,470,404
Total deposits	42,718,211	42,902,544	42,219,322
Federal Home Loan Bank advances	2,316,071	2,316,071	1,241,071
Other borrowings	583,548	596,614	482,516
Subordinated notes	437,493	437,392	437,033
Junior subordinated debentures	253,566	253,566	253,566
Trade date securities payable	0	0	437
Accrued interest payable and other liabilities	1,549,116	1,646,624	1,124,460
Total liabilities	47,858,005	48,152,811	45,758,405
Shareholders’ Equity:
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at March 31, 2023, December 31, 2022 and March 31, 2022; 61,197,979 shares issued at March 31, 2023, 60,797,270 shares issued at December 31, 2022 and 59,090,903 shares issued at March 31, 2022	61,198	60,797	59,091
Surplus	1,913,947	1,902,474	1,698,093
Treasury stock, at cost, 21,564 shares at March 31, 2023, 3,262 shares at December 31, 2022, and 1,837,689 shares at March 31, 2022	(1,966)	(304)	(109,903)
Retained earnings	2,997,263	2,849,007	2,548,474
Accumulated other comprehensive loss	(367,436)	(427,636)	(115,999)
Total shareholders’ equity	5,015,506	4,796,838	4,492,256
Total liabilities and shareholders’ equity	52,873,511	52,949,649	50,250,661
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at March 31, 2023, December 31, 2022 and March 31, 2022
Shareholders’ Equity:
Preferred stock, no par value; 20,000,000 shares authorized:	125,000	125,000	125,000
Series E - $25,000 liquidation value; 11,500 shares issued and outstanding at March 31, 2023, December 31, 2022 and March 31, 2022
Shareholders’ Equity:
Preferred stock, no par value; 20,000,000 shares authorized:	287,500	287,500	287,500
Loans
Assets
Loans, net of unearned income	39,565,471	39,196,485	35,280,547
Allowance for loan losses	(287,972)	(270,173)	(250,539)
Net loans	$ 39,277,499	$ 38,926,312	$ 35,030,008

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Held-to-maturity securities, allowance for credit loss	$ 463	$ 488	$ 159
Held-to-maturity securities, fair value	$ 2,976,198	$ 2,949,821	$ 3,146,427
Preferred stock, authorized (in shares)	20,000,000	20,000,000	20,000,000
Common stock, stated value (usd per share)	$ 1	$ 1	$ 1
Common stock, authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, issued (in shares)	61,197,979	60,797,270	59,090,903
Treasury stock (in shares)	21,564	3,262	1,837,689
Series D Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25	$ 25	$ 25
Preferred stock, issued (in shares)	5,000,000	5,000,000	5,000,000
Preferred stock, outstanding (in shares)	5,000,000	5,000,000	5,000,000
Series E Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25,000	$ 25,000	$ 25,000
Preferred stock, issued (in shares)	11,500	11,500	11,500
Preferred stock, outstanding (in shares)	11,500	11,500	11,500

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income
Interest and fees on loans	$ 558,692	$ 285,698
Mortgage loans held-for-sale	3,528	6,087
Interest-bearing deposits with banks	13,468	1,687
Federal funds sold and securities purchased under resale agreements	70	431
Investment securities	59,943	32,398
Trading account securities	14	5
Federal Home Loan Bank and Federal Reserve Bank stock	3,680	1,772
Brokerage customer receivables	295	174
Total interest income	639,690	328,252
Interest expense
Interest on deposits	144,802	14,854
Interest on Federal Home Loan Bank advances	19,135	4,816
Interest on other borrowings	7,854	2,239
Interest on subordinated notes	5,488	5,482
Interest on junior subordinated debentures	4,416	1,567
Total interest expense	181,695	28,958
Net interest income	457,995	299,294
Provision for credit losses	23,045	4,106
Net interest income after provision for credit losses	434,950	295,188
Non-interest income
Mortgage banking	18,264	77,231
Gains (losses) on investment securities, net	1,398	(2,782)
Fees from covered call options	10,391	3,742
Trading gains, net	813	3,889
Operating lease income, net	13,046	15,475
Other	21,009	18,558
Total non-interest income	107,769	162,790
Non-interest expense
Salaries and employee benefits	176,781	172,355
Software and equipment	24,697	22,810
Operating lease equipment	9,833	9,708
Occupancy, net	18,486	17,824
Data processing	9,409	7,505
Advertising and marketing	11,946	11,924
Professional fees	8,163	8,401
Amortization of other acquisition-related intangible assets	1,235	1,609
FDIC insurance	8,669	7,729
Other real estate owned expense, net	(207)	(1,032)
Other	30,157	25,465
Total non-interest expense	299,169	284,298
Income before taxes	243,550	173,680
Income tax expense	63,352	46,289
Net income	180,198	127,391
Preferred stock dividends	6,991	6,991
Net income applicable to common shares	$ 173,207	$ 120,400
Net income per common share-Basic (usd per share)	$ 2.84	$ 2.11
Net income per common share-Diluted (usd per share)	2.80	2.07
Cash dividends declared per common share (usd per share)	$ 0.40	$ 0.34
Weighted average common shares outstanding (in shares)	60,950	57,196
Dilutive potential common shares (in shares)	873	862
Average common shares and dilutive common shares (in shares)	61,823	58,058
Wealth management
Non-interest income
Revenue from contracts with customers	$ 29,945	$ 31,394
Service charges on deposit accounts
Non-interest income
Revenue from contracts with customers	$ 12,903	$ 15,283

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 180,198	$ 127,391
Unrealized gains (losses) on available-for-sale securities
Before tax	47,040	(206,017)
Tax effect	(12,537)	54,903
Net of tax	34,503	(151,114)
Reclassification of net gains on available-for-sale securities included in net income
Before tax	560	250
Tax effect	(151)	(67)
Net of tax	409	183
Reclassification of amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale
Before tax	43	42
Tax effect	(11)	(11)
Net of tax	32	31
Net unrealized gains (losses) on available-for-sale securities	34,062	(151,328)
Unrealized gains on derivative instruments
Before tax	34,666	39,481
Tax effect	(9,238)	(10,532)
Net unrealized gains on derivative instruments	25,428	28,949
Foreign currency adjustment
Before tax	890	2,842
Tax effect	(180)	(554)
Net foreign currency adjustment	710	2,288
Total other comprehensive income (loss)	60,200	(120,091)
Comprehensive income	$ 240,398	$ 7,300

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred stock	Common stock	Surplus	Treasury stock	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2021	$ 4,498,688		$ 412,500	$ 58,892	$ 1,685,572	$ (109,903)	$ 2,447,535		$ 4,092
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	127,391						127,391
Other comprehensive income (loss), net of tax	(120,091)								(120,091)
Cash dividends declared on common stock	(19,461)						(19,461)
Dividends on preferred stock	(6,991)						(6,991)
Stock-based compensation	7,891				7,891
Common stock issued for:
Exercise of stock options and warrants	3,358			79	3,279
Restricted stock awards	0			52	(52)
Employee stock purchase plan	842			10	832
Director compensation plan	629			58	571
Ending balance at Mar. 31, 2022	4,492,256		412,500	59,091	1,698,093	(109,903)	2,548,474		(115,999)
Beginning balance at Dec. 31, 2021	4,498,688		412,500	58,892	1,685,572	(109,903)	2,447,535		4,092
Ending balance at Dec. 31, 2022	$ 4,796,838	$ (544)	412,500	60,797	1,902,474	(304)	2,849,007	$ (544)	(427,636)
Common stock issued for:
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2022-02 [Member]
Net income	$ 180,198						180,198
Other comprehensive income (loss), net of tax	60,200								60,200
Cash dividends declared on common stock	(24,407)						(24,407)
Dividends on preferred stock	(6,991)						(6,991)
Stock-based compensation	8,295				8,295
Exercise of stock options and warrants	2,216			54	2,162
Restricted stock awards	(1,662)			275	(275)	(1,662)
Employee stock purchase plan	694			9	685
Director compensation plan	669			63	606
Ending balance at Mar. 31, 2023	$ 5,015,506		$ 412,500	$ 61,198	$ 1,913,947	$ (1,966)	$ 2,997,263		$ (367,436)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash dividends declared on common stock (usd per share)	$ 0.40	$ 0.34
Series D Preferred Stock
Dividends on preferred stock (usd per share)	0.41	0.41
Series E Preferred Stock
Dividends on preferred stock (usd per share)	$ 429.69	$ 429.69

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net income	$ 180,198	$ 127,391
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	23,045	4,106
Depreciation, amortization and accretion, net	18,798	24,526
Stock-based compensation expense	8,295	7,891
Amortization of premium on securities, net	275	893
Accretion of discount and deferred fees on loans, net	(4,263)	(7,540)
Mortgage servicing rights fair value changes, net of economic hedge	10,863	(37,349)
Non-designated derivatives fair value changes, net	(2,805)	(4,046)
Originations and purchases of mortgage loans held-for-sale	(366,006)	(887,393)
Early buy-out exercises of mortgage loans held-for-sale guaranteed by U.S. government agencies, net of subsequent paydowns or payoffs	(6,334)	(4,065)
Proceeds from sales of mortgage loans held-for-sale	366,509	1,085,471
Bank owned life insurance (“BOLI”) loss (income)	1,351	(48)
Decrease in trading securities, net	1,025	209
Decrease in brokerage customer receivables, net	345	3,180
Gains on mortgage loans sold	(10,795)	(20,690)
(Gains) losses on investment securities, net	(1,398)	2,782
Losses (gains) on sales of premises and equipment, net	93	(9)
Losses (gains) on sales and fair value adjustments of other real estate owned, net	99	(1,038)
(Increase) decrease in accrued interest receivable and other assets, net	(97,024)	110,691
(Decrease) increase in accrued interest payable and other liabilities, net	(53,830)	53,062
Net Cash Provided by Operating Activities	68,441	458,024
Investing Activities:
Proceeds from maturities and calls of available-for-sale securities	1,008,597	119,041
Proceeds from maturities and calls of held-to-maturity securities	40,342	66,966
Proceeds from sales of available-for-sale securities	0	0
Proceeds from sales of equity securities with readily determinable fair value	23,592	18,753
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	67	250
Purchases of available-for-sale securities	(996,433)	(996,293)
Purchases of held-to-maturity securities	(6,443)	(560,903)
Purchases of equity securities with readily determinable fair value	(23,697)	(23,255)
Purchases of equity securities without readily determinable fair value	(4,850)	(1,010)
Redemptions (purchases) of Federal Home Loan Bank and Federal Reserve Bank stock, net	20,198	(785)
Distributions from investments in partnerships, net	2,794	124
Proceeds from sales of other real estate owned	435	2,497
Decrease in interest-bearing deposits with banks, net	424,842	1,359,947
Increase in loans, net	(365,885)	(472,409)
Redemption of BOLI	0	960
Purchases of premises and equipment, net	(9,139)	(7,722)
Net Cash Provided by (Used for) Investing Activities	114,420	(493,839)
Financing Activities:
(Decrease) increase in deposit accounts, net	(184,335)	123,733
Decrease in other borrowings, net	(13,968)	(14,928)
Increase in Federal Home Loan Bank advances, net	0	0
Cash payments to settle contingent consideration liabilities recognized in business combinations	(57)	0
Issuance of common shares resulting from the exercise of stock options and employee stock purchase plan	3,579	4,829
Common stock repurchases for tax withholdings related to stock-based compensation	(1,662)	0
Dividends paid	(31,398)	(26,452)
Net Cash (Used for) Provided by Financing Activities	(227,841)	87,182
Net (Decrease) Increase in Cash and Cash Equivalents	(44,980)	51,367
Cash and Cash Equivalents at Beginning of Period	490,966	411,205
Cash and Cash Equivalents at End of Period	$ 445,986	$ 462,572

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The interim consolidated financial statements of Wintrust Financial Corporation and its subsidiaries (collectively, “Wintrust” or the “Company”) presented herein are unaudited, but in the opinion of management, reflect all necessary adjustments of a normal or recurring nature for a fair presentation of results as of the dates and for the periods covered by the interim consolidated financial statements. The accompanying interim consolidated financial statements are unaudited and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations or cash flows in accordance with U.S. generally accepted accounting principles (“GAAP”). The interim unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (“2022 Form 10-K”). Operating results reported for the period are not necessarily indicative of the results which may be expected for the entire year. Reclassifications of certain prior period amounts have been made to conform to the current period presentation. The preparation of the financial statements requires management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities. Management believes that the estimates made are reasonable; however, changes in estimates may be required if economic or other conditions develop differently from management’s expectations. Certain policies and accounting principles inherently have a greater reliance on the use of estimates, assumptions and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Management views critical accounting policies to be those which are highly dependent on subjective or complex judgments, estimates and assumptions, and where changes in those estimates and assumptions could have a significant impact on the financial statements. Management currently views the determination of the allowance for credit losses, including the allowance for loan losses, the allowance for unfunded commitment losses and the allowance for held-to-maturity securities losses, estimations of fair value, the valuations required for impairment testing of goodwill, the valuation and accounting for derivative instruments and income taxes as the accounting areas that require the most subjective and complex judgments, and as such could be the most subject to revision as new information becomes available. Descriptions of the Company’s significant accounting policies are included in Note (1) “Summary of Significant Accounting Policies” of the 2022 Form 10-K. In preparation of these financial statements, subsequent events were evaluated through the time the financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users or filed with the SEC.

Recent Accounting Developments

Recent Accounting Developments	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Recent Accounting Developments	Recent Accounting Developments Business Combinations 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 clarifies diversity in practice related to recognition and measurement of contract assets and liabilities related to revenue contracts with customers which are acquired in a business combination by aligning business combination accounting with the subsequent accounting for contract assets and liabilities by requiring entities to apply ASC Topic 606, Revenue from Contracts with Customers, in order to recognize and measure deferred revenue in a business combination. The guidance also creates an exception to the general recognition and measurement principle in ASC Topic 805, Business Combinations, under which such amounts are recognized by the acquirer at fair value on the acquisition date by providing two practical expedients for acquirers. The Company adopted ASU No. 2021-08 as of January 1, 2023. Adoption of this standard did not have a material impact on the Company’s consolidated financial statements. 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 by allowing multiple hedged layers to be designated for a single closed portfolio of financial assets or one or more beneficial interests secured by a portfolio of financial instruments. The Company adopted ASU No. 2022-01 as of January 1, 2023. Adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU No. 2022-02, “Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” which eliminates the separate recognition and measurement guidance for troubled debt restructurings (“TDRs”) by creditors, while enhancing disclosure requirements for certain loan refinancing and restructurings by creditors when a borrower is experiencing financial difficulty, and requiring entities to disclose current-period gross write-offs by year of origination for certain financing receivables and net investments in leases. The Company adopted ASU No. 2022-02 as of January 1, 2023. Guidance was adopted under a modified retrospective approach and, at January 1, 2023, the Company recognized a cumulative-effect adjustment to the allowance for loan losses of $741,000 representing the change in methodology of estimating expected credit losses for loans previously classified as TDRs. This amount was a positive adjustment to the allowance for loan losses, presented separately on the Company’s Consolidated Statements of Condition, with an offsetting negative adjustment recorded directly to retained earnings, net of taxes. Fair Value Measurement - Equity Securities with 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 the guidance in ASC 820 when measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security, and also requires specific disclosures related to these types of securities. This guidance is effective for fiscal years beginning after December 15, 2023, including interim periods therein, and is to be applied under a prospective approach. Early adoption is permitted. The Company does not expect this guidance to have a material impact on the Company’s consolidated financial statements. Legislation Issued Related to Stock Repurchases On August 16, 2022, the Inflation Reduction Act of 2022 (the “IRA”) was signed by the President of the United States. Among other things, the IRA imposes a 1% excise tax on the fair market value of stock repurchased after December 31, 2022. With certain exceptions, the value of stock repurchased is determined net of stock issued in the year, including shares issued pursuant to compensatory arrangements. This new legislation did not have a material impact on the Company's consolidated financial statements. Equity Method and Joint Ventures - Investments in Tax Credit Structures

Cash and Cash Equivalents

Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2023
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash EquivalentsFor purposes of the Consolidated Statements of Cash Flows, the Company considers cash and cash equivalents to include cash on hand, cash items in the process of collection, non-interest bearing amounts due from correspondent banks, federal funds sold and securities purchased under resale agreements with original maturities of three months or less. These items are included within the Company’s Consolidated Statements of Condition as cash and due from banks, and federal funds sold and securities purchased under resale agreements.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following tables are a summary of the investment securities portfolios as of the dates shown: March 31, 2023 (In thousands) Amortized Gross Gross Fair Available-for-sale securities U.S. Treasury $ 4,947 $ 1 $ — $ 4,948 U.S. government agencies 80,000 — (5,138) 74,862 Municipal 164,110 439 (4,163) 160,386 Corporate notes: Financial issuers 93,995 — (11,320) 82,675 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 3,300,048 1,787 (445,405) 2,856,430 Collateralized mortgage obligations 95,880 — (16,336) 79,544 Total available-for-sale securities $ 3,739,980 $ 2,227 $ (482,362) $ 3,259,845 Held-to-maturity securities U.S. government agencies $ 339,608 $ 24 $ (70,064) $ 269,568 Municipal 174,720 1,117 (2,880) 172,957 Mortgage-backed: (1) Mortgage-backed securities 2,872,591 1,197 (533,415) 2,340,373 Collateralized mortgage obligations 161,874 — (22,431) 139,443 Corporate notes 58,061 14 (4,218) 53,857 Total held-to-maturity securities $ 3,606,854 $ 2,352 $ (633,008) $ 2,976,198 Less: Allowance for credit losses (463) Held-to-maturity securities, net of allowance for credit losses $ 3,606,391 Equity securities with readily determinable fair value $ 116,296 $ 3,065 $ (7,418) $ 111,943 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. December 31, 2022 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ 14,943 $ 5 $ — $ 14,948 U.S. government agencies 80,000 36 (5,814) 74,222 Municipal 173,861 230 (5,436) 168,655 Corporate notes: Financial issuers 93,994 — (9,291) 84,703 Other 1,000 2 — 1,002 Mortgage-backed: (1) Mortgage-backed securities 3,308,494 238 (488,795) 2,819,937 Collateralized mortgage obligations 97,342 — (17,792) 79,550 Total available-for-sale securities $ 3,769,634 $ 511 $ (527,128) $ 3,243,017 Held-to-maturity securities U.S. government agencies $ 339,614 $ — $ (75,293) $ 264,321 Municipal 179,027 477 (4,066) 175,438 Mortgage-backed: (1) Mortgage-backed securities 2,900,031 — (583,682) 2,316,349 Collateralized mortgage obligations 164,151 — (23,322) 140,829 Corporate notes 58,232 — (5,348) 52,884 Total held-to-maturity securities $ 3,641,055 $ 477 $ (691,711) $ 2,949,821 Less: Allowance for credit losses (488) Held-to-maturity securities, net of allowance for credit losses $ 3,640,567 Equity securities with readily determinable fair value $ 115,552 $ 2,935 $ (8,122) $ 110,365 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. March 31, 2022 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 50,000 366 (729) 49,637 Municipal 157,563 1,019 (3,093) 155,489 Corporate notes: Financial issuers 86,994 1 (5,047) 81,948 Other 1,000 — (9) 991 Mortgage-backed: (1) Mortgage-backed securities 2,794,760 591 (177,899) 2,617,452 Collateralized mortgage obligations 103,424 1 (10,044) 93,381 Total available-for-sale securities $ 3,193,741 $ 1,978 $ (196,821) $ 2,998,898 Held-to-maturity securities U.S. government agencies $ 264,661 $ 35 $ (27,673) $ 237,023 Municipal 180,548 3,176 (1,693) 182,031 Mortgage-backed: (1) Mortgage-backed securities 2,772,622 — (253,254) 2,519,368 Collateralized mortgage obligations 174,273 — (6,847) 167,426 Corporate notes 43,784 — (3,205) 40,579 Total held-to-maturity securities $ 3,435,888 $ 3,211 $ (292,672) $ 3,146,427 Less: Allowance for credit losses (159) Held-to-maturity securities, net of allowance for credit losses $ 3,435,729 Equity securities with readily determinable fair value $ 91,629 $ 5,259 $ (4,199) $ 92,689 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. Equity securities without readily determinable fair values totaled $52.5 million as of March 31, 2023. Equity securities without readily determinable fair values are included as part of accrued interest receivable and other assets in the Company’s Consolidated Statements of Condition. The Company monitors its equity investments without readily determinable fair values to identify potential transactions that may indicate an observable price change in orderly transactions for the identical or a similar investment of the same issuer, requiring adjustment to its carrying amount. The Company recorded no upward or downward adjustments related to such observable price changes for the three months ended March 31, 2023 or March 31, 2022. The Company conducts a quarterly assessment of its equity securities without readily determinable fair values to determine whether impairment exists in such securities, considering, among other factors, the nature of the securities, financial condition of the issuer and expected future cash flows. During the three months ended March 31, 2023, the Company recorded no impairment of equity securities without readily determinable fair values. During the three months ended March 31, 2022, the Company recorded $571,000 of impairment of equity securities without readily determinable fair values. The following table presents the portion of the Company’s available-for-sale investment securities portfolios that have gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at March 31, 2023: Continuous unrealized Continuous unrealized Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale securities U.S. government agencies $ 29,945 $ (55) $ 44,917 $ (5,083) $ 74,862 $ (5,138) Municipal 58,695 (624) 55,413 (3,539) 114,108 (4,163) Corporate notes: Financial issuers 9,912 (87) 72,763 (11,233) 82,675 (11,320) Mortgage-backed: (1) Mortgage-backed securities 219,643 (7,558) 2,297,025 (437,847) 2,516,668 (445,405) Collateralized mortgage obligations 72 (1) 79,472 (16,335) 79,544 (16,336) Total available-for-sale securities $ 318,267 $ (8,325) $ 2,549,590 $ (474,037) $ 2,867,857 $ (482,362) (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. The Company conducts a regular assessment of its investment securities to determine whether securities are experiencing credit losses. Factors for consideration include the nature of the securities, credit ratings or financial condition of the issuer, the extent of the unrealized loss, expected cash flows, market conditions and the Company’s ability to hold the securities through the anticipated recovery period. The Company does not consider available-for-sale securities with unrealized losses at March 31, 2023 to be experiencing credit losses and recognized no resulting allowance for credit losses for such individually assessed credit losses. The Company does not intend to sell these investments and it is more likely than not that the Company will not be required to sell these investments before recovery of the amortized cost bases, which may be the maturity dates of the securities. The unrealized losses within each category have occurred as a result of changes in interest rates, market spreads and market conditions subsequent to purchase. Available-for-sale securities with continuous unrealized losses existing for more than twelve months at March 31, 2023 were primarily mortgage-backed securities with unrealized losses due to increased market rates during such period. See Note (6) “Allowance for Credit Losses” for further discussion regarding any credit losses associated with held-to-maturity securities at March 31, 2023. The following table provides information as to the amount of gross gains and losses, adjustments and impairment on investment securities recognized in earnings and proceeds received through the sale or call of investment securities: Three months ended March 31, (In thousands) 2023 2022 Realized gains on investment securities $ 605 $ 258 Realized losses on investment securities (45) (8) Net realized gains on investment securities 560 250 Unrealized gains on equity securities with readily determinable fair value 2,290 180 Unrealized losses on equity securities with readily determinable fair value (1,452) (2,641) Net unrealized gains (losses) on equity securities with readily determinable fair value 838 (2,461) Upward adjustments of equity securities without readily determinable fair values — — Downward adjustments of equity securities without readily determinable fair values — — Impairment of equity securities without readily determinable fair values — (571) Adjustment and impairment, net, of equity securities without readily determinable fair values — (571) Gains (losses) on investment securities, net $ 1,398 $ (2,782) Proceeds from sales of available-for-sale securities (1) $ — $ — Proceeds from sales of equity securities with readily determinable fair value 23,592 18,753 Proceeds from sales and capital distributions of equity securities without readily determinable fair value 67 250 (1) Includes proceeds from available-for-sale securities sold in accordance with written covered call options sold to a third party. The amortized cost and fair value of available-for-sale and held-to-maturity investment securities as of March 31, 2023, December 31, 2022 and March 31, 2022, by contractual maturity, are shown in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties: March 31, 2023 December 31, 2022 March 31, 2022 (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities Due in one year or less $ 108,880 $ 108,429 $ 119,830 $ 119,275 $ 48,130 $ 47,945 Due in one to five years 131,959 122,172 63,644 61,701 67,138 66,034 Due in five to ten years 39,019 35,158 115,734 105,076 110,960 105,670 Due after ten years 64,194 58,112 64,590 57,478 69,329 68,416 Mortgage-backed 3,395,928 2,935,974 3,405,836 2,899,487 2,898,184 2,710,833 Total available-for-sale securities $ 3,739,980 $ 3,259,845 $ 3,769,634 $ 3,243,017 $ 3,193,741 $ 2,998,898 Held-to-maturity securities Due in one year or less $ 2,302 $ 2,300 $ 1,340 $ 1,332 $ 1,208 $ 1,213 Due in one to five years 98,207 93,717 94,705 89,093 83,085 80,210 Due in five to ten years 110,967 110,892 115,318 113,758 101,410 102,940 Due after ten years 360,913 289,473 365,510 288,460 303,290 275,270 Mortgage-backed 3,034,465 2,479,816 3,064,182 2,457,178 2,946,895 2,686,794 Total held-to-maturity securities $ 3,606,854 $ 2,976,198 $ 3,641,055 $ 2,949,821 $ 3,435,888 $ 3,146,427 Less: Allowance for credit losses (463) (488) (159) Held-to-maturity securities, net of allowance for credit losses $ 3,606,391 $ 3,640,567 $ 3,435,729 Securities having a carrying value of $5.7 billion at March 31, 2023 as well as securities having a carrying value of $2.8 billion and $2.5 billion at December 31, 2022 and March 31, 2022, respectively, were pledged as collateral for public deposits, trust

Loans

Loans	3 Months Ended
	Mar. 31, 2023
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the Company’s loan portfolio by category as of the dates shown: March 31, December 31, March 31, (Dollars in thousands) 2023 2022 2022 Balance: Commercial $ 12,576,985 $ 12,549,164 $ 11,583,963 Commercial real estate 10,239,078 9,950,947 9,235,074 Home equity 337,016 332,698 321,435 Residential real estate 2,505,545 2,372,383 1,799,985 Premium finance receivables Property and casualty insurance 5,738,880 5,849,459 4,937,408 Life insurance 8,125,802 8,090,998 7,354,163 Consumer and other 42,165 50,836 48,519 Total loans, net of unearned income $ 39,565,471 $ 39,196,485 $ 35,280,547 Mix: Commercial 32 % 32 % 33 % Commercial real estate 26 25 26 Home equity 1 1 1 Residential real estate 6 6 5 Premium finance receivables Property and casualty insurance 14 15 14 Life insurance 21 21 21 Consumer and other 0 0 0 Total loans, net of unearned income 100 % 100 % 100 % The Company’s loan portfolio is generally comprised of loans to consumers and small to medium-sized businesses, which, for the commercial and commercial real estate portfolios, are located primarily within the geographic market areas that the banks serve. Various niche lending businesses, including lease finance and franchise lending, operate on a national level. The premium finance receivables portfolios are made to customers throughout the United States and Canada. The Company strives to maintain a loan portfolio that is diverse in terms of loan type, industry, borrower and geographic concentrations. Such diversification reduces the exposure to economic downturns that may occur in different segments of the economy or in different industries. Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $244.0 million at March 31, 2023, $224.5 million at December 31, 2022 and $140.3 million at March 31, 2022. Total loans, excluding purchased credit deteriorated (“PCD”) loans, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $70.9 million at March 31, 2023, $71.8 million at December 31, 2022 and $59.3 million at March 31, 2022. It is the policy of the Company to review each prospective credit in order to determine the appropriateness and, when required, the adequacy of security or collateral necessary to obtain when making a loan. The type of collateral, when required, will vary from liquid assets to real estate. The Company seeks to ensure access to collateral, in the event of default, through adherence to state lending laws and the Company’s credit monitoring procedures.

Allowance for Credit Losses

Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2023
Credit Loss [Abstract]
Allowance for Credit Losses	Allowance for Credit LossesIn accordance with ASC 326, the Company is required to measure the allowance for credit losses of financial assets with similar risk characteristics on a collective or pooled basis. In considering the segmentation of financial assets measured at amortized cost into pools, the Company considered various risk characteristics in its analysis. Generally, the segmentation utilized represents the level at which the Company develops and documents its systematic methodology to determine the allowance for credit losses for the financial assets held at amortized cost, specifically the Company's loan portfolio and debt securities classified as held-to-maturity. Descriptions of the Company’s loan portfolio segments and major debt security types are included in Note (5) “Allowance for Credit Losses” of the 2022 Form 10-K. In accordance with ASC 326, the Company elected to not measure an allowance for credit losses on accrued interest. As such accrued interest is written off in a timely manner when deemed uncollectible. Any such write-off of accrued interest will reverse previously recognized interest income. In addition, the Company elected to not include accrued interest within presentation and disclosures of the carrying amount of financial assets held at amortized cost. This election is applicable to the various disclosures included within the Company's financial statements. Accrued interest related to financial assets held at amortized cost is included within accrued interest receivable and other assets The tables below show the aging of the Company’s loan portfolio by the segmentation noted above at March 31, 2023, December 31, 2022 and March 31, 2022: As of March 31, 2023 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances (includes PCD): Commercial Commercial, industrial and other $ 47,950 $ — $ 10,755 $ 95,593 $ 12,422,687 $ 12,576,985 Commercial real estate Construction and development 5,404 — 4,438 19,616 1,567,595 1,597,053 Non-construction 5,792 — 16,101 53,064 8,567,068 8,642,025 Home equity 1,190 — 116 1,118 334,592 337,016 Residential real estate, excluding early buy-out loans 11,333 104 74 19,183 2,278,699 2,309,393 Premium finance receivables Property and casualty insurance loans 18,543 9,215 14,287 32,545 5,664,290 5,738,880 Life insurance loans — 1,066 21,552 52,975 8,050,209 8,125,802 Consumer and other 6 87 10 379 41,683 42,165 Total loans, net of unearned income, excluding early buy-out loans $ 90,218 $ 10,472 $ 67,333 $ 274,473 $ 38,926,823 $ 39,369,319 Early buy-out loans guaranteed by U.S. government agencies (1) 29,245 36,920 — 1,485 128,502 196,152 Total loans, net of unearned income $ 119,463 $ 47,392 $ 67,333 $ 275,958 $ 39,055,325 $ 39,565,471 As of December 31, 2022 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances (includes PCD): Commercial Commercial, industrial and other $ 35,579 $ 462 $ 21,128 $ 56,696 $ 12,435,299 $ 12,549,164 Commercial real estate Construction and development 416 — 361 14,390 1,471,763 1,486,930 Non-construction 5,971 — 1,883 16,285 8,439,878 8,464,017 Home equity 1,487 — — 2,152 329,059 332,698 Residential real estate, excluding early buy-out loans 10,171 — 4,364 9,982 2,183,078 2,207,595 Premium finance receivables Property and casualty insurance loans 13,470 15,841 14,926 40,557 5,764,665 5,849,459 Life insurance loans — 17,245 5,260 68,725 7,999,768 8,090,998 Consumer and other 6 49 18 224 50,539 50,836 Total loans, net of unearned income, excluding early buy-out loans $ 67,100 $ 33,597 $ 47,940 $ 209,011 $ 38,674,049 $ 39,031,697 Early buy-out loans guaranteed by U.S. government agencies (1) 31,279 47,450 984 1,584 83,491 164,788 Total loans, net of unearned income $ 98,379 $ 81,047 $ 48,924 $ 210,595 $ 38,757,540 $ 39,196,485 (1) Early buy-out loans are insured or guaranteed by the FHA or the U.S. Department of Veterans Affairs, subject to indemnifications and insurance limits for certain loans. As of March 31, 2022 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances (includes PCD): Commercial Commercial, industrial and other $ 16,878 $ — $ 1,294 $ 31,889 $ 11,533,902 $ 11,583,963 Commercial real estate Construction and development 1,054 — — 1,409 1,393,943 1,396,406 Non-construction 11,247 — 2,648 28,732 7,796,041 7,838,668 Home equity 1,747 — 199 545 318,944 321,435 Residential real estate, excluding early buy-out loans 7,262 — 293 18,808 1,723,526 1,749,889 Premium finance receivables Property and casualty insurance loans 6,707 12,363 8,890 21,278 4,888,170 4,937,408 Life insurance loans — — 22,401 15,522 7,316,240 7,354,163 Consumer and other 4 43 5 221 48,246 48,519 Total loans, net of unearned income, excluding early buy-out loans $ 44,899 $ 12,406 $ 35,730 $ 118,404 $ 35,019,012 $ 35,230,451 Early buy-out loans guaranteed by U.S. government agencies (1) 4,661 28,958 — 185 16,292 50,096 Total loans, net of unearned income $ 49,560 $ 41,364 $ 35,730 $ 118,589 $ 35,035,304 $ 35,280,547 (1) Early buy-out loans are insured or guaranteed by the FHA or the U.S. Department of Veterans Affairs, subject to indemnifications and insurance limits for certain loans. Credit Quality Indicators Credit quality indicators, specifically the Company's internal risk rating systems, reflect how the Company monitors credit losses and represents factors used by the Company when measuring the allowance for credit losses. Descriptions of the Company’s credit quality indicators by financial asset are included in Note (5) “Allowance for Credit Losses” of the 2022 Form 10-K. The table below shows the Company’s loan portfolio by credit quality indicator and year of origination at March 31, 2023: Year of Origination Revolving Total (In thousands) 2023 2022 2021 2020 2019 Prior Revolving to Term Loans Loan Balances: Commercial, industrial and other Pass $ 752,119 $ 2,576,073 $ 2,081,628 $ 940,341 $ 603,016 $ 1,213,066 $ 3,872,419 $ 3,497 $ 12,042,159 Special mention 402 55,314 92,315 9,462 23,220 10,695 149,012 268 340,688 Substandard accrual — 13,415 40,397 2,401 12,670 40,814 36,035 456 146,188 Substandard nonaccrual/doubtful — 550 5,479 10,985 28,490 2,215 231 — 47,950 Total commercial, industrial and other $ 752,521 $ 2,645,352 $ 2,219,819 $ 963,189 $ 667,396 $ 1,266,790 $ 4,057,697 $ 4,221 $ 12,576,985 Construction and development Pass $ 42,635 $ 506,714 $ 512,801 $ 204,113 $ 111,497 $ 119,478 $ 12,626 $ 369 $ 1,510,233 Special mention — — 1,475 16,480 23,494 14,360 — — 55,809 Substandard accrual — 2,337 — 8,301 — 14,969 — — 25,607 Substandard nonaccrual/doubtful — 4,190 798 — — 416 — — 5,404 Total construction and development $ 42,635 $ 513,241 $ 515,074 $ 228,894 $ 134,991 $ 149,223 $ 12,626 $ 369 $ 1,597,053 Non-construction Pass $ 472,528 $ 1,862,370 $ 1,441,054 $ 1,002,397 $ 814,910 $ 2,637,342 $ 184,246 $ 649 $ 8,415,496 Special mention — 4,351 11,872 2,140 29,868 74,174 1,439 — 123,844 Substandard accrual — — 3,163 22,041 16,827 54,862 — — 96,893 Substandard nonaccrual/doubtful — — — — — 5,792 — — 5,792 Total non-construction $ 472,528 $ 1,866,721 $ 1,456,089 $ 1,026,578 $ 861,605 $ 2,772,170 $ 185,685 $ 649 $ 8,642,025 Home equity Pass $ — $ — $ — $ — $ 56 $ 5,633 $ 317,387 $ — $ 323,076 Special mention — — — — — 1,430 2,193 — 3,623 Substandard accrual — — — — — 8,214 869 44 9,127 Substandard nonaccrual/doubtful — — 77 116 18 880 99 — 1,190 Total home equity $ — $ — $ 77 $ 116 $ 74 $ 16,157 $ 320,548 $ 44 $ 337,016 Residential real estate Early buy-out loans guaranteed by U.S. government agencies $ — $ — $ 769 $ 9,250 $ 19,430 $ 166,703 $ — $ — $ 196,152 Pass 95,403 815,003 825,881 225,297 118,840 196,150 — — 2,276,574 Special mention 40 3,816 718 1,992 542 4,488 — — 11,596 Substandard accrual 323 1,204 1,825 1,182 1,100 4,256 — — 9,890 Substandard nonaccrual/doubtful — 284 1,100 759 1,665 7,525 — — 11,333 Total residential real estate $ 95,766 $ 820,307 $ 830,293 $ 238,480 $ 141,577 $ 379,122 $ — $ — $ 2,505,545 Premium finance receivables - property and casualty Pass $ 2,826,947 $ 2,757,313 $ 35,647 $ 5,270 $ 906 $ — $ — $ — $ 5,626,083 Special mention 42,025 49,190 969 17 — — — — 92,201 Substandard accrual 205 1,700 148 — — — — — 2,053 Substandard nonaccrual/doubtful 777 16,975 779 12 — — — — 18,543 Total premium finance receivables - property and casualty $ 2,869,954 $ 2,825,178 $ 37,543 $ 5,299 $ 906 $ — $ — $ — $ 5,738,880 Premium finance receivables - life Pass $ 49,164 $ 550,396 $ 830,917 $ 1,056,414 $ 936,674 $ 4,699,645 $ — $ — $ 8,123,210 Special mention — — 1,156 1,436 — — — — 2,592 Substandard accrual — — — — — — — — — Substandard nonaccrual/doubtful — — — — — — — — — Total premium finance receivables - life $ 49,164 $ 550,396 $ 832,073 $ 1,057,850 $ 936,674 $ 4,699,645 $ — $ — $ 8,125,802 Consumer and other Pass $ 750 $ 2,469 $ 1,414 $ 200 $ 433 $ 5,306 $ 31,392 $ — $ 41,964 Special mention — 6 1 — 2 133 3 — 145 Substandard accrual — 2 — — — 40 8 — 50 Substandard nonaccrual/doubtful — — 6 — — — — — 6 Total consumer and other $ 750 $ 2,477 $ 1,421 $ 200 $ 435 $ 5,479 $ 31,403 $ — $ 42,165 Total loans Early buy-out loans guaranteed by U.S. government agencies $ — $ — $ 769 $ 9,250 $ 19,430 $ 166,703 $ — $ — $ 196,152 Pass 4,239,546 9,070,338 5,729,342 3,434,032 2,586,332 8,876,620 4,418,070 4,515 38,358,795 Special mention 42,467 112,677 108,506 31,527 77,126 105,280 152,647 268 630,498 Substandard accrual 528 18,658 45,533 33,925 30,597 123,155 36,912 500 289,808 Substandard nonaccrual/doubtful 777 21,999 8,239 11,872 30,173 16,828 330 — 90,218 Total loans $ 4,283,318 $ 9,223,672 $ 5,892,389 $ 3,520,606 $ 2,743,658 $ 9,288,586 $ 4,607,959 $ 5,283 $ 39,565,471 Current period gross write offs $ 478 $ 4,893 $ 1,194 $ 337 $ 318 $ 131 $ — $ — $ 7,351 Held-to-maturity debt securities The Company conducts an assessment of its investment securities, including those classified as held-to-maturity, at the time of purchase and on at least an annual basis to ensure such investment securities remain within appropriate levels of risk and continue to perform satisfactorily in fulfilling its obligations. The Company considers, among other factors, the nature of the securities and credit ratings or financial condition of the issuer. If available, the Company obtains a credit rating for issuers from a Nationally Recognized Statistical Rating Organization (“NRSRO”) for consideration. If no such rating is available for an issuer, the Company performs an internal rating based on the scale utilized within the loan portfolio as discussed above. For purposes of the table below, the Company has converted any issuer rating from an NRSRO into the Company’s internal ratings based on Investment Policy and review by the Company’s management. As of March 31, 2023 Year of Origination Total (In thousands) 2023 2022 2021 2020 2019 Prior Balance Amortized Cost Balances: U.S. government agencies 1-4 internal grade $ — $ 160,000 $ 147,804 $ 25,000 $ 4,000 $ 2,804 $ 339,608 5-7 internal grade — 8-10 internal grade — Total U.S. government agencies $ — $ 160,000 $ 147,804 $ 25,000 $ 4,000 $ 2,804 $ 339,608 Municipal 1-4 internal grade $ — $ 1,042 $ 6,978 $ 264 $ 618 $ 165,818 $ 174,720 5-7 internal grade — — — — — — — 8-10 internal grade — — — — — — — Total municipal $ — $ 1,042 $ 6,978 $ 264 $ 618 $ 165,818 $ 174,720 Mortgage-backed securities 1-4 internal grade $ 5,065 $ 606,922 $ 2,422,478 $ — $ — $ — $ 3,034,465 5-7 internal grade — — — — — — — 8-10 internal grade — — — — — — — Total mortgage-backed securities $ 5,065 $ 606,922 $ 2,422,478 $ — $ — $ — $ 3,034,465 Corporate notes 1-4 internal grade $ — $ 14,964 $ — $ 6,009 $ 7,291 $ 29,797 $ 58,061 5-7 internal grade — — — — — — — 8-10 internal grade — — — — — — — Total corporate notes $ — $ 14,964 $ — $ 6,009 $ 7,291 $ 29,797 $ 58,061 Total held-to-maturity securities $ 3,606,854 Less: Allowance for credit losses (463) Held-to-maturity securities, net of allowance for credit losses $ 3,606,391 Measurement of Allowance for Credit Losses The Company's allowance for credit losses consists of the allowance for loan losses, the allowance for unfunded commitment losses and the allowance for held-to-maturity debt security losses. In accordance with ASC 326, the Company measures the allowance for credit losses at the time of origination or purchase of a financial asset, representing an estimate of lifetime expected credit losses on the related asset. When developing its estimate, the Company considers available information relevant to assessing the collectability of cash flows, from both internal and external sources. Historical credit loss experience is one input in the estimation process as well as inputs relevant to current conditions and reasonable and supportable forecasts. In considering past events, the Company considers the relevance, or lack thereof, of historical information due to changes in such things as financial asset underwriting or collection practices, and changes in portfolio mix due to changing business plans and strategies. In considering current conditions and forecasts, the Company considers both the current economic environment and the forecasted direction of the economic environment with emphasis on those factors deemed relevant to or driving changes in expected credit losses. As significant judgment is required, the review of the appropriateness of the allowance for credit losses is performed quarterly by various committees with participation by the Company's executive management. March 31, December 31, March 31, (In thousands) 2023 2022 2022 Allowance for loan losses $ 287,972 $ 270,173 $ 250,539 Allowance for unfunded lending-related commitments losses 87,826 87,275 50,629 Allowance for loan losses and unfunded lending-related commitments losses 375,798 357,448 301,168 Allowance for held-to-maturity securities losses 463 488 159 Allowance for credit losses $ 376,261 $ 357,936 $ 301,327 The allowance for credit losses is measured on a collective or pooled basis when similar risk characteristics exist, based upon the segmentation discussed above. The Company utilizes modeling methodologies that estimate lifetime credit loss rates on each pool, including methodologies estimating the probability of default and loss given default on specific segments. Historical credit loss history is adjusted for reasonable and supportable forecasts developed by the Company on a quantitative or qualitative basis and incorporates third party economic forecasts. Reasonable and supportable forecasts consider the macroeconomic factors that are most relevant to evaluating and predicting expected credit losses in the Company's financial assets. Currently, the Company utilizes an eight quarter forecast period using a single macroeconomic scenario provided by a third party and reviewed within the Company's governance structure. For periods beyond the ability to develop reasonable and supportable forecasts, the Company reverts to historical loss rates at an input level, straight-line over a four quarter reversion period. Expected credit losses are measured over the contractual term of the financial asset with consideration of expected prepayments. Expected extensions, renewals or modifications of the financial asset are considered when the expected extension, renewal or modification is contained within the existing agreement and is not unconditionally cancelable. The methodologies discussed above are applied to both current asset balances on the Company's Consolidated Statements of Condition and off-balance sheet commitments (i.e. unfunded lending-related commitments). Assets that do not share similar risk characteristics with a pool are assessed for the allowance for credit losses on an individual basis. These typically include assets experiencing financial difficulties, including assets rated as substandard nonaccrual and doubtful. If foreclosure is probable or the asset is considered collateral-dependent, expected credit losses are measured based upon the fair value of the underlying collateral adjusted for selling costs, if appropriate. Underlying collateral across the Company's segments consist primarily of real estate, land and construction assets as well as general business assets of the borrower. As of March 31, 2023, excluding loans carried at fair value, substandard nonaccrual loans totaling $23.3 million in carrying balance had no related allowance for credit losses. The Company does not measure an allowance for credit losses on accrued interest receivable balances because these balances are written off in a timely manner as a reduction to interest income when assets are placed on nonaccrual status. Loan portfolios A summary of activity in the allowance for credit losses, specifically for the loan portfolio (i.e. allowance for loan losses and allowance for unfunded commitment losses), for the three and three months ended March 31, 2023 and 2022 is as follows. Three months ended March 31, 2023 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses at beginning of period $ 142,769 $ 184,352 $ 7,573 $ 11,585 $ 10,671 $ 498 $ 357,448 Cumulative effect adjustment from the adoption of ASU 2022-02 111 1,356 (33) (692) — (1) 741 Other adjustments — — — — 4 — 4 Charge-offs (2,543) (5) — — (4,650) (153) (7,351) Recoveries 392 100 35 4 1,323 32 1,886 Provision for credit losses 8,772 8,977 153 537 4,607 24 23,070 Allowance for credit losses at period end $ 149,501 $ 194,780 $ 7,728 $ 11,434 $ 11,955 $ 400 $ 375,798 By measurement method: Individually measured $ 11,281 $ 1,621 $ — $ — $ — $ 1 $ 12,903 Collectively measured 138,220 193,159 7,728 11,434 11,955 399 362,895 Loans at period end Individually measured $ 47,950 $ 11,196 $ 1,190 $ 11,280 $ — $ 6 $ 71,622 Collectively measured 12,529,035 10,227,882 335,826 2,286,733 13,864,682 42,159 39,286,317 Loans held at fair value — — — 207,532 — — 207,532 Three months ended March 31, 2022 Commercial Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Allowance for credit losses at beginning of period $ 119,307 $ 144,583 $ 10,699 $ 8,782 $ 15,859 $ 423 $ 299,653 Other adjustments — — — — 22 — 22 Charge-offs (1,414) (777) (197) (466) (1,678) (193) (4,725) Recoveries 538 32 93 5 1,476 49 2,193 Provision for credit losses 2,480 1,068 (29) 1,108 (957) 355 4,025 Allowance for credit losses at period end $ 120,911 $ 144,906 $ 10,566 $ 9,429 $ 14,722 $ 634 $ 301,168 By measurement method: Individually measured $ 3,698 $ 522 $ 127 $ 800 $ — $ 5 $ 5,152 Collectively measured 117,213 144,384 10,439 8,629 14,722 629 296,016 Loans at period end Individually measured $ 19,651 $ 22,370 $ 12,904 $ 17,842 $ — $ 79 $ 72,846 Collectively measured 11,564,312 9,212,704 308,531 1,724,159 12,291,571 48,440 35,149,717 Loans held at fair value — — — 57,984 — — 57,984 For the three months ended March 31, 2023, and 2022, the Company recognized approximately $23.1 million and $4.0 million of provision for credit losses, respectively, related to loans and lending agreements. The provision for each period was primarily the result of loan growth as well as the Company's macroeconomic forecasts of key model inputs (most notably, Baa corporate credit spreads). Uncertainties remain regarding expected economic performance and macroeconomic forecasts utilized in the measurement of the allowance for credit losses as of March 31, 2023. Other key drivers of provision for credit losses in these portfolios include, but are not limited to, stable loan risk rating migration. Net charge-offs in the three month periods ending March 31, 2023 and 2022, totaled $5.5 million and $2.5 million, respectively. Held-to-maturity debt securities The allowance for credit losses on the Company’s held-to-maturity debt securities is presented as a reduction to the amortized cost basis of held-to-maturity securities on the Company's Consolidated Statements of Condition. For the three month period ended March 31, 2023 and 2022, the Company recognized approximately $(25,000) and $81,000, respectively, of provision for credit losses related to held-to-maturity securities. At March 31, 2023, the Company did not identify any losses within its portfolio that it would deem a credit loss and require additional measurement of an allowance for credit losses. Loan Modifications to Borrowers Experiencing Financial Difficulties The Company’s approach to restructuring or modifying loans is built on its credit risk rating system, which requires credit management personnel to assign a credit risk rating to each loan. In each case, the loan officer is responsible for recommending a credit risk rating for each loan and ensuring the credit risk ratings are appropriate. These credit risk ratings are then reviewed and approved by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors, including a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s credit risk rating scale is one through ten with higher scores indicating higher risk. In the case of loans rated six or worse following modification, the Company’s Managed Assets Division evaluates the loan and the credit risk rating and determines that the loan has been restructured to be reasonably assured of repayment and of performance according to the modified terms and is supported by a current, well-documented credit assessment of the borrower’s financial condition and prospects for repayment under the revised terms. Based on the Company’s credit risk rating system, it considers that borrowers whose credit risk rating is 5 or better are not experiencing financial difficulties. Restructurings may arise when, due to financial difficulties experienced by the borrower, the Company obtains through physical possession one or more collateral assets in satisfaction of all or part of an existing credit. Once possession is obtained, the Company reclassifies the appropriate portion of the remaining balance of the credit from loans to other real estate owned (“OREO”), which is included within other assets in the Consolidated Statements of Condition. For any residential real estate property collateralizing a consumer mortgage loan, the Company is considered to possess the related collateral only if legal title is obtained upon completion of foreclosure, or the borrower conveys all interest in the residential real estate property to the Company through completion of a deed in lieu of foreclosure or similar legal agreement. At March 31, 2023, the Company had $1.1 million of foreclosed residential real estate properties included within OREO. Further, the recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $53.4 million and $7.7 million at March 31, 2023 and 2022, respectively. The table below presents a summary of the balance immediately following the modification of loans to borrowers experiencing financial difficulties during the three months ended March 31, 2023: Three months ended March 31, 2023 (Dollars in thousands) Total (1) Percentage of Total Class of Loan Extension of Term (1) Reduction of Interest Rate (1) Delay in Contractual Payments (1) Extension of Term and Reduction of Interest Rate (1) Commercial Commercial, industrial and other $ 37,474 0.3 % $ 1,938 $ 221 $ 35,265 $ 50 Commercial real estate Non-construction 1,333 — 467 827 39 — Home equity 203 0.1 203 — — — Residential real estate 1,708 0.1 1,253 271 — 184 Premium finance receivables Property and casualty insurance loans 11 0.0 3 — — 8 Total loans $ 40,729 0.1 % $ 3,864 $ 1,319 $ 35,304 $ 242 Weighted average magnitude of modifications: Duration of extension and delayed payment terms 27 months 17 months Reduction of interest rate 275 bps (1) Balances represent the recorded investment in the loan at the time of the restructuring. The following table presents a summary of all loans for borrowers experiencing financial difficulties modified during the three months ended March 31, 2023, and such loans that were in payment default under the restructured terms during the respective periods below: (Dollars in thousands) As of March 31, 2023 Three Months Ended March 31, 2023 Total (2) Payments in Default (1)(2) Commercial Commercial, industrial and other $ 37,474 $ 2 Commercial real estate Non-construction 1,333 828 Home equity 203 104 Residential real estate 1,708 — Premium finance receivables Property and casualty insurance loans 11 11 Total loans $ 40,729 $ 945 (1) Modified loans considered to be in payment default are over 30 days past due subsequent to the restructuring. (2) Balances represent the recorded investment in the loan at the time of the restructuring.

Goodwill and Other Acquisition-

Goodwill and Other Acquisition-Related Intangible Assets	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Acquisition-Related Intangible Assets	Goodwill and Other Acquisition-Related Intangible Assets A summary of the Company’s goodwill assets by reporting unit is presented in the following table: (In thousands) December 31, 2022 Goodwill Impairment Goodwill Adjustments March 31, Community banking $ 545,671 $ — $ — $ — $ 545,671 Specialty finance 38,480 — — 63 38,543 Wealth management 69,373 — — — 69,373 Total $ 653,524 $ — $ — $ 63 $ 653,587 The specialty finance unit’s goodwill increased $63,000 in the first three months of 2023 as a result of foreign currency translation adjustments related to the Canadian acquisitions. The Company assesses each reporting unit’s goodwill for impairment on at least an annual basis and considers potential indicators of impairment at each reporting date between annual goodwill impairment tests. At October 1, 2022, the Company utilized a qualitative approach for its annual goodwill impairment tests of the banking, specialty finance and wealth management reporting units and determined that no impairment existed at that time. At each reporting date between annual goodwill impairment tests, the Company considers potential indicators of impairment. The Company assessed whether events and circumstances resulted in it being more likely than not that the fair value of any reporting unit was less than its carrying value. Potential impairment indicators considered include the condition of the economy and banking industry; government intervention and regulatory updates; the impact of recent events to financial performance and cost factors of the reporting units; performance of the Company’s stock and other relevant events. At the conclusion of this assessment of all reporting units, the Company determined that as of March 31, 2023, it was more likely than not that the fair value of all reporting units exceeded the respective carrying value of such reporting unit. A summary of acquisition-related intangible assets as of the dates shown and the expected amortization of finite-lived acquisition-related intangible assets as of March 31, 2023 is as follows: (In thousands) March 31, December 31, March 31, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,206 $ 55,206 $ 55,206 Accumulated amortization (43,473) (42,501) (39,243) Net carrying amount $ 11,733 $ 12,705 $ 15,963 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 17,533 $ 18,505 $ 21,763 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,962 $ 1,962 $ 1,968 Accumulated amortization (1,799) (1,785) (1,738) Net carrying amount $ 163 $ 177 $ 230 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 20,430 Accumulated amortization (17,175) (16,926) (15,724) Net carrying amount $ 3,255 $ 3,504 $ 4,706 Total acquisition-related intangible assets: Gross carrying amount $ 83,398 $ 83,398 $ 83,404 Accumulated amortization (62,447) (61,212) (56,705) Total other acquisition-related intangible assets, net $ 20,951 $ 22,186 $ 26,699 Estimated amortization Actual in three months ended March 31, 2023 $ 1,235 Estimated remaining in 2023 3,422 Estimated—2024 3,259 Estimated—2025 2,552 Estimated—2026 1,954 Estimated—2027 1,450 The core deposit intangibles recognized in connection with prior bank acquisitions are amortized over a ten-year period on an accelerated basis. The customer list intangibles recognized in connection with the purchase of life insurance premium finance assets in 2009 are being amortized over an 18-year period on an accelerated basis. The customer list and other intangibles recognized in connection with prior acquisitions within the wealth management segment are being amortized over a period of up to ten years on a straight-line basis. Indefinite-lived intangible assets consist of certain trade and domain names recognized in connection with the acquisition of certain assets of Veterans First Mortgage in 2018. As indefinite-lived intangible assets are not amortized, the Company assesses impairment on at least an annual basis. Total amortization expense associated with finite-lived acquisition-related intangibles totaled approximately $1.2 million and $1.6 million for the three months ended March 31, 2023 and 2022, respectively.

Mortgage Servicing Rights ("MSR

Mortgage Servicing Rights ("MSRs")	3 Months Ended
	Mar. 31, 2023
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Mortgage Servicing Rights (MSRs)	Mortgage Servicing Rights (“MSRs”) The following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the periods indicated: Three Months Ended March 31, March 31, (In thousands) 2023 2022 Fair value at beginning of the period $ 230,225 $ 147,571 Additions from loans sold with servicing retained 5,107 14,401 Estimate of changes in fair value due to: Early buyout options (“EBO”) exercised — (175) Payoffs and paydowns (3,909) (6,016) Changes in valuation inputs or assumptions (6,953) 43,365 Fair value at end of the period $ 224,470 $ 199,146 Unpaid principal balance of mortgage loans serviced for others $ 14,080,461 $ 13,426,535 The Company recognizes MSR assets upon the sale of residential real estate loans to external third parties when it retains the obligation to service the loans and the servicing fee is more than adequate compensation. MSRs are included in other assets in the Consolidated Statements of Condition. The initial recognition of MSR assets from loans sold with servicing retained and subsequent changes in fair value of all MSRs are recognized in mortgage banking revenue. MSRs are subject to changes in value from actual and expected prepayment of the underlying loans. The estimation of fair value related to MSRs is partly impacted by the Company exercising its EBO on eligible loans previously sold to the Government National Mortgage Association (“GNMA”). Under such optional repurchase program, financial institutions acting as servicers are allowed to buy back from the securitized loan pool individual delinquent mortgage loans meeting certain criteria for which the institution was the original transferor of such loans. At the option of the servicer and without prior authorization from GNMA, the servicer may repurchase such delinquent loans for an amount equal to the remaining principal balance of the loan. At the time of such repurchase, any MSR value related to such loans is derecognized. The MSR asset fair value is determined by using a discounted cash flow model that incorporates the objective characteristics of the portfolio as well as subjective valuation parameters that purchasers of servicing would apply to such portfolios sold into the secondary market. The subjective factors include loan prepayment speeds, discount rates, servicing costs and other economic factors. The Company uses a third party to assist in the valuation of MSRs. Periodically, the Company will purchase options for the right to purchase securities not currently held within the banks’ investment portfolios or enter into interest rate swaps in which the Company elects not to designate such derivatives as hedging instruments. These option and swap transactions are designed primarily to economically hedge a portion of the fair value adjustments related to the Company’s MSRs. The gain or loss associated with these derivative contracts is included in mortgage banking revenue. For more information regarding these hedges outstanding as of March 31, 2023, see Note (13) “Derivative Financial Instruments” in Item 1 of this report. There were no such options or swaps outstanding as of March 31, 2022.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2023
Deposits [Abstract]
Deposits	Deposits The following table is a summary of deposits as of the dates shown: (Dollars in thousands) March 31, December 31, March 31, Balance: Non-interest-bearing $ 11,236,083 $ 12,668,160 $ 13,748,918 NOW and interest-bearing demand deposits 5,576,558 5,591,986 5,089,724 Wealth management deposits 1,809,933 2,463,833 2,542,995 Money market 13,552,277 12,886,795 13,012,460 Savings 5,192,108 4,556,635 4,089,230 Time certificates of deposit 5,351,252 4,735,135 3,735,995 Total deposits $ 42,718,211 $ 42,902,544 $ 42,219,322 Mix: Non-interest-bearing 26 % 30 % 32 % NOW and interest-bearing demand deposits 13 13 12 Wealth management deposits 4 5 6 Money market 32 30 31 Savings 12 11 10 Time certificates of deposit 13 11 9 Total deposits 100 % 100 % 100 % Wealth management deposits represent deposit balances (primarily money market accounts) at the Company’s subsidiary banks from brokerage customers of Wintrust Investments, LLC (“Wintrust Investments”), Chicago Deferred Exchange Company (“CDEC”) and trust and asset management customers of the Company.

FHLB Advances, Other Borrowings

FHLB Advances, Other Borrowings and Subordinated Notes	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
FHLB Advances, Other Borrowings and Subordinated Notes	FHLB Advances, Other Borrowings and Subordinated Notes The following table is a summary of FHLB advances, other borrowings and subordinated notes as of the dates shown: (In thousands) March 31, December 31, March 31, FHLB advances $ 2,316,071 $ 2,316,071 $ 1,241,071 Other borrowings: Notes payable 192,666 199,793 74,969 Short-term borrowings 10,124 17,612 15,872 Secured borrowings 320,007 317,942 328,889 Other 60,751 61,267 62,786 Total other borrowings 583,548 596,614 482,516 Subordinated notes 437,493 437,392 437,033 Total FHLB advances, other borrowings and subordinated notes $ 3,337,112 $ 3,350,077 $ 2,160,620 Descriptions of the Company’s FHLB advances, other borrowings, and subordinated notes are included in Note (11) “Federal Home Loan Bank Advances”, Note (12) “Subordinated Notes” and Note (13) “Other Borrowings” of the 2022 Form 10-K. Notes Payable At March 31, 2023, the outstanding principal balance under the term loan facility was $192.7 million and there was no outstanding balance under the revolving credit facility. Borrowings under notes payable are secured by pledges of and first priority perfected security interests in the Company’s equity interest in its bank subsidiaries and contain several restrictive covenants, including the maintenance of various capital adequacy levels, asset quality and profitability ratios, and certain restrictions on dividends and other indebtedness. At March 31, 2023, the Company was in compliance with all such covenants. Short-term Borrowings As of March 31, 2023, the Company had pledged securities related to its customer balances in sweep accounts of $18.3 million. Securities pledged for customer balances in sweep accounts and short-term borrowings from brokers are maintained under the Company’s control and consist of mortgage-backed securities and U.S. government agencies. These securities are included in the available-for-sale portfolio as reflected on the Company’s Consolidated Statements of Condition. The following is a summary of these securities pledged as of March 31, 2023 disaggregated by investment category and maturity of the related customer sweep account, and reconciled to the outstanding balance of securities sold under repurchase agreements: (In thousands) Overnight Sweep Collateral Available-for-sale securities pledged Mortgage-backed securities $ 18,348 Excess collateral 8,224 Securities sold under repurchase agreements $ 10,124 Secured Borrowings At March 31, 2023, the translated balance of the secured borrowings totaled $310.6 million compared to $309.7 million at December 31, 2022 and $319.8 million at March 31, 2022. The interest rate under the receivables purchase agreement is the Canadian Commercial Paper Rate plus 78 basis points. The remaining $9.4 million within secured borrowings at March 31, 2023 represents other sold interests in certain loans by the Company that were not considered sales and, as such, related proceeds received are reflected on the Company’s Consolidated Statements of Condition as a secured borrowing owed to the various unrelated third parties. Other Borrowings

Junior Subordinated Debentures

Junior Subordinated Debentures	3 Months Ended
	Mar. 31, 2023
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Junior Subordinated Debentures	Junior Subordinated Debentures The following table provides a summary of the Company’s junior subordinated debentures as of March 31, 2023. The junior subordinated debentures represent the par value of the obligations owed to the Trusts. (Dollars in thousands) Common Trust Junior Rate Contractual Rate at 3/31/2023 Issue Maturity Earliest Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 L+3.25 8.08 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 L+2.80 7.96 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 L+2.60 7.76 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 L+1.95 6.82 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 L+1.45 6.61 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 L+1.63 6.50 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 L+3.00 7.81 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 L+3.00 7.81 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 L+3.00 8.16 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 L+1.75 6.62 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 L+1.62 6.49 % 06/2007 09/2037 06/2012 Total $ 253,566 7.16 % The junior subordinated debentures totaled $253.6 million at March 31, 2023, December 31, 2022 and March 31, 2022. The interest rates on the variable rate junior subordinated debentures are based on the three-month London Interbank Offered Rate (“LIBOR”) and reset on a quarterly basis. At March 31, 2023, the weighted average contractual interest rate on the junior subordinated debentures was 7.16%. Under the Adjustable Interest Rate (LIBOR) Act (“AIRLA”) and Part 253 of Regulation ZZ (Rule 253), after June 30, 2023, the interest rate on the junior subordinated debentures will, by operation of law, change their base rate from USD LIBOR to Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR”) of the same tenor, plus an applicable tenor spread adjustment. CME Term SOFR is an indicative, forward-looking measurement of daily overnight SOFR. CME Term SOFR is published by CME Group Inc., as administrator of that rate. The calculation agent for any series of the junior subordinated debentures may also make additional administrative conforming changes to the terms of that series of the junior subordinated debentures under AIRLA and Rule 253.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information The Company’s operations consist of three primary segments: community banking, specialty finance and wealth management. The three reportable segments are strategic business units that are separately managed as they offer different products and services and have different marketing strategies. In addition, each segment’s customer base has varying characteristics and each segment has a different regulatory environment. While the Company’s management monitors each of the fifteen bank subsidiaries’ operations and profitability separately, these subsidiaries have been aggregated into one reportable operating segment due to the similarities in products and services, customer base, operations, profitability measures, and economic characteristics. For purposes of internal segment profitability, management allocates certain intersegment and parent company balances. Management allocates a portion of revenues to the specialty finance segment related to loans and leases originated by the specialty finance segment and sold or assigned to the community banking segment. Similarly, for purposes of analyzing the contribution from the wealth management segment, management allocates a portion of the net interest income earned by the community banking segment on deposit balances of customers of the wealth management segment to the wealth management segment. See Note (9) “Deposits” for more information on these deposits. Finally, expenses incurred at the Wintrust parent company are allocated to each segment based on each segment’s risk-weighted assets. The segment financial information provided in the following table has been derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. The accounting policies of the segments are substantially similar to those described in Note (1) “Summary of Significant Accounting Policies” of the 2022 Form 10-K. The Company evaluates segment performance based on after-tax profit or loss and other appropriate profitability measures common to each segment. The following is a summary of certain operating information for reportable segments: Three Months Ended $ Change in % Change in (Dollars in thousands) March 31, March 31, Net interest income: Community Banking $ 369,848 $ 228,615 $ 141,233 62 % Specialty Finance 70,351 55,370 14,981 27 Wealth Management 8,955 8,376 579 7 Total Operating Segments 449,154 292,361 156,793 54 Intersegment Eliminations 8,841 6,933 1,908 28 Consolidated net interest income $ 457,995 $ 299,294 $ 158,701 53 % Provision for credit losses: Community Banking $ 21,099 $ 4,118 $ 16,981 NM Specialty Finance 1,946 (12) 1,958 NM Wealth Management — — — — Total Operating Segments 23,045 4,106 18,939 NM Intersegment Eliminations — — — — Consolidated provision for credit losses $ 23,045 $ 4,106 $ 18,939 NM Non-interest income: Community Banking $ 68,733 $ 121,888 $ (53,155) (44) % Specialty Finance 25,790 24,122 1,668 7 Wealth Management 30,297 30,578 (281) (1) Total Operating Segments 124,820 176,588 (51,768) (29) Intersegment Eliminations (17,051) (13,798) (3,253) 24 Consolidated non-interest income $ 107,769 $ 162,790 $ (55,021) (34) % Net revenue: Community Banking $ 438,581 $ 350,503 $ 88,078 25 % Specialty Finance 96,141 79,492 16,649 21 Wealth Management 39,252 38,954 298 1 Total Operating Segments 573,974 468,949 105,025 22 Intersegment Eliminations (8,210) (6,865) (1,345) 20 Consolidated net revenue $ 565,764 $ 462,084 $ 103,680 22 % Segment profit: Community Banking $ 134,232 $ 90,099 $ 44,133 49 % Specialty Finance 36,737 29,604 7,133 24 Wealth Management 9,229 7,688 1,541 20 Consolidated net income $ 180,198 $ 127,391 $ 52,807 41 % Segment assets: Community Banking $ 41,611,980 $ 40,050,015 $ 1,561,965 4 % Specialty Finance 9,841,044 8,624,501 1,216,543 14 Wealth Management 1,420,487 1,576,145 (155,658) (10) Consolidated total assets $ 52,873,511 $ 50,250,661 $ 2,622,850 5 % NM - Not meaningful

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company primarily enters into derivative financial instruments as part of its strategy to manage its exposure to changes in interest rates. Derivative instruments represent contracts between parties that result in one party delivering cash to the other party based on a notional amount and an underlying term (such as a rate, security price or price index or commodity price) as specified in the contract. The amount of cash delivered from one party to the other is determined based on the interaction of the notional amount of the contract with the underlying term. Derivatives are also implicit in certain contracts and commitments. The derivative financial instruments currently used by the Company to manage its exposure to interest rate risk include: (1) interest rate swaps and collars to manage the interest rate risk of certain fixed and variable rate assets and variable rate liabilities; (2) interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market; (3) forward commitments for the future delivery of such mortgage loans to protect the Company from adverse changes in interest rates and corresponding changes in the value of mortgage loans held-for-sale; (4) covered call options to economically hedge specific investment securities and receive fee income, effectively enhancing the overall yield on such securities to compensate for net interest margin compression; and (5) options and swaps to economically hedge a portion of the fair value adjustments related to the Company’s mortgage servicing rights portfolio. The Company also enters into derivatives (typically interest rate swaps and commodity forward contracts) with certain qualified borrowers to facilitate the borrowers’ risk management strategies and concurrently enters into mirror-image derivatives with a third party counterparty, effectively making a market in the derivatives for such borrowers. Additionally, the Company enters into foreign currency contracts to manage foreign exchange risk associated with certain foreign currency denominated assets. The Company recognizes derivative financial instruments in the consolidated financial statements at fair value regardless of the purpose or intent for holding the instrument. The Company records derivative assets and derivative liabilities on the Consolidated Statements of Condition within accrued interest receivable and other assets and accrued interest payable and other liabilities, respectively. Changes in the fair value of derivative financial instruments are either recognized in income or in shareholders’ equity as a component of accumulated other comprehensive income or loss depending on whether the derivative financial instrument qualifies for hedge accounting and, if so, whether it qualifies as a fair value hedge or cash flow hedge. Changes in fair values of derivatives accounted for as fair value hedges are recorded in income in the same period and in the same income statement line as changes in the fair values of the hedged items that relate to the hedged risk(s). Changes in fair values of derivative financial instruments accounted for as cash flow hedges are recorded as a component of accumulated other comprehensive income or loss, net of deferred taxes, and reclassified to earnings when the hedged transaction affects earnings. Changes in fair values of derivative financial instruments not designated in a hedging relationship pursuant to ASC 815 are reported in non-interest income during the period of the change. Derivative financial instruments are valued by a third party and are corroborated by comparison with valuations provided by the respective counterparties. Fair values of certain mortgage banking derivatives (interest rate lock commitments and forward commitments to sell mortgage loans) are estimated based on changes in mortgage interest rates from the date of the loan commitment. The fair value of foreign currency derivatives is computed based on changes in foreign currency rates stated in the contract compared to those prevailing at the measurement date. Commodity derivative fair values are computed based on changes in the price per unit stated in the contract compared to those prevailing at the measurement date. The table below presents the fair value of the Company’s derivative financial instruments as of March 31, 2023, December 31, 2022 and March 31, 2022: Derivative Assets Derivative Liabilities (In thousands) March 31, December 31, March 31, March 31, December 31, March 31, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ 25,730 $ — $ 13,257 $ 43,412 $ 58,198 $ 3,361 Interest rate derivatives designated as Fair Value Hedges 13,732 16,768 7,388 — — 1,716 Total derivatives designated as hedging instruments under ASC 815 $ 39,462 $ 16,768 $ 20,645 $ 43,412 $ 58,198 $ 5,077 Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 219,869 $ 269,670 $ 119,056 $ 219,053 $ 271,109 $ 115,002 Interest rate lock commitments 5,356 1,711 3,447 67 58 1,558 Forward commitments to sell mortgage loans 121 220 10,063 2,953 414 147 Commodity forward contracts 491 257 — 315 162 — Foreign exchange contracts 8,705 8,222 323 8,632 8,137 323 Total derivatives not designated as hedging instruments under ASC 815 $ 234,542 $ 280,080 $ 132,889 $ 231,020 $ 279,880 $ 117,030 Total Derivatives $ 274,004 $ 296,848 $ 153,534 $ 274,432 $ 338,078 $ 122,107 Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to net interest income and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps and interest rate collars as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts to or from a counterparty in exchange for the Company receiving or paying fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. Interest rate collars designated as cash flow hedges involve the settlement of amounts in which the interest rate index specified in the contract exceeds the agreed upon cap strike price or in which the interest rate index specified in the contract is below the agreed upon floor strike price at the end of each period. As of March 31, 2023, the Company had various interest rate collar and swap derivatives designated as cash flow hedges of variable rate loans and various interest rate swap derivatives designated as cash flow hedges of variable rate deposits. When the relationship between the hedged item and hedging instrument is highly effective at achieving offsetting changes in cash flows attributable to the hedged risk, changes in the fair value of these cash flow hedges are recorded in accumulated other comprehensive income or loss and are subsequently reclassified to interest income as interest payments are made on such variable rate loans or interest expense as interest payments are made on such variable rate deposits. The changes in fair value (net of tax) are separately disclosed in the Consolidated Statements of Comprehensive Income. The table below provides details on these cash flow hedges, summarized by derivative type and maturity, as of March 31, 2023: March 31, 2023 Notional Fair Value (In thousands) Amount Asset (Liability) Interest Rate Collars at 1-month CME term SOFR: Buy 2.250% floor, sell 3.743% cap; matures September 2025 $ 1,250,000 $ (16,675) Buy 2.750% floor, sell 4.320% cap; matures October 2026 500,000 (126) Buy 2.000% floor, sell 3.450% cap; matures September 2027 1,250,000 (26,069) Interest Rate Swaps at 1-month CME term SOFR: Fixed 3.748%; matures December 2025 250,000 26 Fixed 3.759%; matures December 2025 250,000 99 Fixed 3.680%; matures February 2026 250,000 (251) Fixed 4.176%; matures March 2026 250,000 3,342 Fixed 3.915%; matures March 2026 250,000 1,531 Fixed 4.450%; matures July 2026 250,000 6,502 Fixed 3.515%, matures December 2026 250,000 123 Fixed 3.512%; matures December 2026 250,000 97 Fixed 3.453%; matures February 2027 250,000 (291) Fixed 4.150%; matures July 2027 250,000 7,238 Fixed 3.748%; matures March 2028 250,000 4,649 Fixed 3.526%; matures March 2028 250,000 2,123 Total Cash Flow Hedges $ 6,000,000 $ (17,682) In the first quarter of 2022, the Company terminated interest rate swap derivative contracts designated as cash flow hedges of variable rate deposits with a total notional value of $1.0 billion and a five-year term effective July 2022. At the time of termination, the fair value of the derivative contracts totaled an asset of $66.5 million, with such adjustments to fair value recorded in accumulated other comprehensive income or loss. In the second quarter of 2022, the Company terminated two additional interest rate swap derivative contracts designated as cash flow hedges of variable rate deposits with a total notional value of $500.0 million each effective since April 2020. The remaining terms of such derivative contracts were through March 2023 and April 2024 and, at the time of termination, the fair value of the derivative contracts totaled assets of $3.7 million and $10.7 million, respectively, with such adjustments to fair value recorded in accumulated other comprehensive income or loss. In the fourth quarter of 2022, the Company terminated one additional interest rate collar derivative contract designated as a cash flow hedge of the term facility with a total notional value of $64.3 million effective since September 2018. The remaining term of such derivative contract was through September 2023 and, at the time of termination, the fair value of the derivative contract totaled an asset of $875,000, with such adjustments to fair value recorded in accumulated other comprehensive income or loss. For all such terminations, as the hedged forecasted transactions (interest payments on variable rate deposits and the term facility) are still expected to occur over the remaining term of such terminated derivatives, such adjustments will remain in accumulated other comprehensive income or loss and be reclassified as a reduction to interest expense on a straight-line basis over the original term of the terminated derivative contracts. A rollforward of the amounts in accumulated other comprehensive income or loss related to interest rate derivatives designated as cash flow hedges, including such derivative contracts terminated during the period, follows: Three Months Ended (In thousands) March 31, March 31, Unrealized gain at beginning of period $ 10,026 $ 36,908 Amount reclassified from accumulated other comprehensive income or loss to interest income or expense on deposits, loans, and other borrowings 3,572 5,353 Amount of gain recognized in other comprehensive income or loss 31,094 34,128 Unrealized gain at end of period $ 44,692 $ 76,389 As of March 31, 2023, the Company estimated that during the next 12 months $85.8 million will be reclassified from accumulated other comprehensive income or loss as an increase to net interest income. Such estimate consists of $19.2 million reclassified as a reduction to interest expense on the terminated cash flow hedges discussed above and $66.6 million reclassified as an addition to interest income related to the interest rate collars and swaps noted above that remain outstanding. Fair Value Hedges of Interest Rate Risk Interest rate swaps designated as fair value hedges involve the payment of fixed amounts to a counterparty in exchange for the Company receiving variable payments over the life of the agreements without the exchange of the underlying notional amount. As of March 31, 2023, the Company had 14 interest rate swaps with an aggregate notional amount of $206.0 million that were designated as fair value hedges primarily associated with fixed rate commercial and industrial and commercial real estate loans as well as life insurance premium finance receivables. For derivatives designated and that qualify as fair value hedges, the net gain or loss from the entire change in the fair value of the derivative instrument is recognized in the same income statement line item as the earnings effect, including the net gain or loss, of the hedged item (interest income earned on fixed rate loans) when the hedged item affects earnings. The following table presents the carrying amount of the hedged assets/(liabilities) and the cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) that are designated as a fair value hedge accounting relationship as of March 31, 2023: March 31, 2023 (In thousands) Derivatives in Fair Value Hedging Relationships Location in the Statement of Condition Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued Interest rate swaps Loans, net of unearned income $ 138,254 $ (13,682) $ (100) Available-for-sale debt securities 898 (15) — The following table presents the loss or gain recognized related to derivative instruments that are designated as fair value hedges for the respective period: (In thousands) Derivatives in Fair Value Hedging Relationships Location of (Loss)/Gain Recognized Three Months Ended March 31, 2023 Interest rate swaps Interest and fees on loans $ (9) Interest income - investment securities — Non-Designated Hedges The Company does not use derivatives for speculative purposes. Derivatives not designated as accounting hedges are used to manage the Company’s economic exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of ASC 815. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings. Interest Rate Derivatives —Periodically, the Company may purchase interest rate cap derivatives designed to act as an economic hedge of the risk of the negative impact on its fixed-rate loan portfolios from rising interest rates, most recently related to the LIBOR index. As of March 31, 2023, there were no interest rate caps outstanding that were designed to act as an economic hedge. During 2022, the Company terminated an interest rate cap derivative contract related to LIBOR that was not designated as an accounting hedge with a total notional value of $1.0 billion. Additionally, the Company has interest rate derivatives, including swaps and option products, resulting from a service the Company provides to certain qualified borrowers. The Company’s banking subsidiaries execute certain derivative products (typically interest rate swaps) directly with qualified commercial borrowers to facilitate their respective risk management strategies. For example, these arrangements allow the Company’s commercial borrowers to effectively convert a variable rate loan to a fixed rate. In order to minimize the Company’s exposure on these transactions, the Company simultaneously executes offsetting derivatives with third parties. In most cases, the offsetting derivatives have mirror-image terms, which result in the positions’ changes in fair value substantially offsetting through earnings each period. However, to the extent that the derivatives are not a mirror-image and because of differences in counterparty credit risk, changes in fair value will not completely offset resulting in some earnings impact each period. Changes in the fair value of these derivatives are included in other non-interest income. At March 31, 2023 and December 31, 2022, the Company had interest rate derivative transactions with an aggregate notional amount of approximately $9.9 billion and $9.6 billion, respectively, (all interest rate swaps and caps with customers and third parties) related to this program. At March 31, 2023 these interest rate derivatives had maturity dates ranging from April 2023 to January 2037. Mortgage Banking Derivatives— These derivatives include interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market and forward commitments for the future delivery of such loans. It is the Company’s practice to enter into forward commitments for the future delivery of a portion of its residential mortgage loan production when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held-for-sale. The Company’s mortgage banking derivatives have not been designated as being in hedge relationships. At March 31, 2023 and December 31, 2022, the Company had interest rate lock commitments with an aggregate notional amount of approximately $208.2 million and $121.6 million, and forward commitments to sell mortgage loans with an aggregate notional amount of approximately $498.0 million and $321.0 million, respectively. The fair values of these derivatives were estimated based on changes in mortgage rates from the dates of the commitments. Changes in the fair value of these mortgage banking derivatives are included in mortgage banking revenue. Commodity Derivatives— The Company has commodity forward contracts resulting from a service the Company provides to certain qualified borrowers. The Company’s banking subsidiaries execute certain derivative products directly with qualified commercial borrowers to facilitate their respective risk management strategies. For example, these arrangements allow the Company’s commercial borrowers to effectively purchase or sell a given commodity at an agreed-upon price on an agreed-upon settlement date. In order to minimize the Company’s exposure on these transactions, the Company simultaneously executes offsetting derivatives with third parties. In most cases, the offsetting derivatives have mirror-image terms, which result in the positions’ changes in fair value substantially offsetting through earnings each period. However, to the extent that the derivatives are not a mirror-image and because of differences in counterparty credit risk, changes in fair value will not completely offset resulting in some earnings impact each period. Changes in the fair value of these derivatives are included in other non-interest income. At March 31, 2023 and December 31, 2022, the Company had commodity derivative transactions with an aggregate notional amount of approximately $5.6 million and $3.6 million, respectively, (all forward contracts with customers and third parties) related to this program. At March 31, 2023, these commodity derivatives had maturity dates ranging from April 2023 to October 2024. Foreign Currency Derivatives— The Company has foreign currency derivative contracts resulting from a service the Company provides to certain qualified customers. The Company’s banking subsidiaries execute certain derivative products directly with qualified customers to facilitate their respective risk management strategies related to foreign currency fluctuations. For example, these arrangements allow the Company’s customers to effectively exchange the currency of one country for the currency of another country at an agreed-upon price on an agreed-upon settlement date. In order to minimize the Company’s exposure on these transactions, the Company simultaneously executes offsetting derivatives with third parties. In most cases, the offsetting derivatives have mirror-image terms, which result in the positions’ changes in fair value substantially offsetting through earnings each period. However, to the extent that the derivatives are not a mirror-image and because of differences in counterparty credit risk, changes in fair value will not completely offset resulting in some earnings impact each period. Changes in the fair value of these derivatives are included in other non-interest income. As of March 31, 2023 and December 31, 2022, the Company held foreign currency derivatives with an aggregate notional amount of approximately $225.2 million and $226.2 million, respectively. Other Derivatives— Periodically, the Company will sell options to a bank or dealer for the right to purchase certain securities held within the banks’ investment portfolios (covered call options). These option transactions are designed to increase the total return associated with the investment securities portfolio. These options do not qualify as accounting hedges pursuant to ASC 815 and, accordingly, changes in the fair value of these contracts are recognized as other non-interest income. There were no covered call options outstanding as of March 31, 2023, December 31, 2022 or March 31, 2022. Periodically, the Company will purchase options for the right to purchase securities not currently held within the banks’ investment portfolios or enter into interest rate swaps in which the Company elects to not designate such derivatives as hedging instruments. These option and swap transactions are designed primarily to economically hedge a portion of the fair value adjustments related to the Company's mortgage servicing rights portfolio. The gain or loss associated with these derivative contracts are included in mortgage banking revenue. As of March 31, 2023 and December 31, 2022, the Company held three interest rate derivatives with an aggregate notional value of $245.0 million and $190.0 million, respectively, for such purpose of economically hedging a portion of the fair value adjustment related to its mortgage servicing rights portfolio. Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows: (In thousands) Three Months Ended Derivative Location in income statement March 31, March 31, Interest rate swaps and caps Trading gains, net $ 800 $ 4,024 Mortgage banking derivatives Mortgage banking revenue 3,640 (7,369) Commodity contracts Trading gains (losses), net 177 — Foreign exchange contracts Trading gains, net — — Covered call options Fees from covered call options 10,391 3,742 Derivative contract held as economic hedge on MSRs Mortgage banking revenue 946 — Credit Risk Derivative instruments have inherent risks, primarily market risk and credit risk. Market risk is associated with changes in interest rates and credit risk relates to the risk that the counterparty will fail to perform according to the terms of the agreement. The amounts potentially subject to market and credit risks are the streams of interest payments under the contracts and the market value of the derivative instrument and not the notional principal amounts used to express the volume of the transactions. Market and credit risks are managed and monitored as part of the Company’s overall asset-liability management process, except that the credit risk related to derivatives entered into with certain qualified borrowers is managed through the Company’s standard loan underwriting process since these derivatives are secured through collateral provided by the loan agreements. Actual exposures are monitored against various types of credit limits established to contain risk within parameters. When deemed necessary, appropriate types and amounts of collateral are obtained to minimize credit exposure. The Company has agreements with certain of its interest rate derivative counterparties that contain cross-default provisions, which provide that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision allowing the counterparty to terminate the derivative positions if the Company fails to maintain its status as a well or adequately capitalized institution, which would require the Company to settle its obligations under the agreements. As of March 31, 2023, there were no interest rate derivatives in a net liability position that were subject to such agreements. The fair value of such derivatives includes accrued interest related to these agreements. The Company is also exposed to the credit risk of its commercial borrowers who are counterparties to interest rate derivatives with the banks. This counterparty risk related to the commercial borrowers is managed and monitored through the banks’ standard underwriting process applicable to loans since these derivatives are secured through collateral provided by the loan agreement. The counterparty risk associated with the mirror-image swaps executed with third parties is monitored and managed in connection with the Company’s overall asset liability management process. The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative assets and liabilities on the Consolidated Statements of Condition. The table below summarizes the Company’s interest rate derivatives and offsetting positions as of the dates shown. Derivative Assets Derivative Liabilities Fair Value Fair Value (In thousands) March 31, December 31, March 31, March 31, December 31, March 31, Gross Amounts Recognized $ 259,331 $ 286,438 $ 139,701 $ 262,465 $ 329,307 $ 120,079 Less: Amounts offset in the Statements of Condition — — — — — — Net amount presented in the Statements of Condition $ 259,331 $ 286,438 $ 139,701 $ 262,465 $ 329,307 $ 120,079 Gross amounts not offset in the Statements of Condition Offsetting Derivative Positions (55,838) (64,100) (19,557) (55,838) (64,100) (19,557) Collateral Posted (181,884) (194,666) (70,807) — — (257) Net Credit Exposure $ 21,609 $ 27,672 $ 49,337 $ 206,627 $ 265,207 $ 100,265

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	Fair Values of Assets and Liabilities The Company measures, monitors and discloses certain of its assets and liabilities on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the inputs used to determine fair value. These levels are: • Level 1—unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3—significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. A financial instrument’s categorization within the above valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the assets or liabilities. The following is a description of the valuation methodologies used for the Company’s assets and liabilities measured at fair value on a recurring basis. Available-for-sale debt securities, trading account securities and equity securities with readily determinable fair value —Fair values for available-for-sale debt securities, trading account securities and equity securities with readily determinable fair value are typically based on prices obtained from independent pricing vendors. Securities measured with these valuation techniques are generally classified as Level 2 of the fair value hierarchy. Typically, standard inputs such as benchmark yields, reported trades for similar securities, issuer spreads, benchmark securities, bids, offers and reference data including market research publications are used to determine the fair value of these securities. When these inputs are not available, broker/dealer quotes may be obtained by the vendor to determine the fair value of the security. We review the vendor’s pricing methodologies to determine if observable market information is being used, versus unobservable inputs. Fair value measurements using significant inputs that are unobservable in the market due to limited activity or a less liquid market are classified as Level 3 in the fair value hierarchy. The fair value of U.S. Treasury securities and certain equity securities with readily determinable fair value are based on unadjusted quoted prices in active markets for identical securities. As such, these securities are classified as Level 1 in the fair value hierarchy. The Company’s Investment Operations Department is responsible for the valuation of Level 3 available-for-sale debt securities. The methodology and variables used as inputs in pricing Level 3 securities are derived from a combination of observable and unobservable inputs. The unobservable inputs are determined through internal assumptions that may vary from period to period due to external factors, such as market movement and credit rating adjustments. At March 31, 2023, the Company classified $112.3 million of municipal securities as Level 3. These municipal securities are bond issues for various municipal government entities primarily located in the Chicago metropolitan area and southern Wisconsin and are privately placed, non-rated bonds without CUSIP numbers. The Company’s methodology for pricing these securities focuses on three distinct inputs: equivalent rating, yield and other pricing terms. To determine the rating for a given non-rated investment debt security, the Investment Operations Department references a rated, publicly issued bond by the same issuer if available. A reduction is then applied to the rating obtained from the comparable bond, as the Company believes if liquidated, a non-rated bond would be valued less than a similar bond with a verifiable rating. The reduction applied by the Company is one complete rating grade (i.e. a “AA” rating for a comparable bond would be reduced to “A” for the Company’s valuation). For bond issues without comparable bond proxies, a rating of “BBB” was assigned. In the first quarter of 2023, all of the ratings derived by the Investment Operations Department using the above process were “BBB” or better. The fair value measurement noted above is sensitive to the rating input, as a higher rating typically results in an increased valuation. The remaining pricing inputs used in the bond valuation are observable. Based on the rating determined in the above process, Investment Operations obtains a corresponding current market yield curve available to market participants. Other terms including coupon, maturity date, redemption price, number of coupon payments per year, and accrual method are obtained from the individual bond term sheets. Certain municipal bonds held by the Company at March 31, 2023 are continuously callable. When valuing these bonds, the fair value is capped at par value as the Company assumes a market participant would not pay more than par for a continuously callable bond. Mortgage loans held-for-sale —The fair value of mortgage loans held-for-sale is typically determined by reference to investor price sheets for loan products with similar characteristics. Loans measured with this valuation technique are classified as Level 2 in the fair value hierarchy. At March 31, 2023, the Company classified $44.3 million of certain delinquent mortgage loans held-for-sale as Level 3. For such delinquent loans in which investor interest may be limited, the Company estimates fair value by discounting future scheduled cash flows for the specific loan through its life, adjusted for estimated credit losses. The Company uses a discount rate based on prevailing market coupon rates on loans with similar characteristics. The assumed weighted average discount rate used as an input to value these loans at March 31, 2023 was 5.96%. The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. Additionally, the weighted average credit discount used as an input to value the specific loans was 0.22% with credit loss discount ranging from 0%-10% at March 31, 2023. Loans held-for-investment —The fair value for certain loans in which the Company previously elected the fair value option is estimated by discounting future scheduled cash flows for the specific loan through maturity, adjusted for estimated credit losses and prepayment or life assumptions. These loans primarily consist of early buyout loans guaranteed by U.S. government agencies that are delinquent and, as a result, investor interest may be limited. The Company uses a discount rate based on the actual coupon rate of the underlying loan. At March 31, 2023, the Company classified $69.5 million of loans held-for-investment carried at fair value as Level 3. The assumed weighted average discount rate used as an input to value these loans at March 31, 2023 was 5.98%. The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. As noted above, the fair value estimate also includes assumptions of prepayment speeds and average life as well as credit losses. The weighted average prepayments speed used as an input to value current loans was 6.92% at March 31, 2023. Prepayment speeds are inversely related to the fair value of these loans as an increase in prepayment speeds results in a decreased valuation. For delinquent loans in which performance is not assumed and there is a higher probability of resolution of the loan ending in foreclosure, the weighted average life of such loans was 5.4 years. Average life is inversely related to the fair value of these loans as an increase in estimated life results in a decreased valuation. Additionally, the weighted average credit discount used as an input to value the specific loans was 0.86% with credit loss discounts ranging from 0%-13% at March 31, 2023. MSRs —Fair value for MSRs is determined utilizing a valuation model which calculates the fair value of each servicing right based on the present value of estimated future cash flows. The Company uses a discount rate commensurate with the risk associated with each servicing right, given current market conditions. At March 31, 2023, the Company classified $224.5 million of MSRs as Level 3. The weighted average discount rate used as an input to value the pool of MSRs at March 31, 2023 was 10.33% with discount rates applied ranging from 3%-33%. The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. The fair value of MSRs was also estimated based on other assumptions including prepayment speeds and the cost to service. Prepayment speeds ranged from 0%-100% or a weighted average prepayment speed of 6.92%. Further, for current and delinquent loans, the Company assumed a weighted average cost of servicing of $76 and $403, respectively, per loan. Prepayment speeds and the cost to service are both inversely related to the fair value of MSRs as an increase in prepayment speeds or the cost to service results in a decreased valuation. See Note (8) “Mortgage Servicing Rights (“MSRs”)” for further discussion of MSRs. Derivative instruments —The Company’s derivative instruments include interest rate swaps, caps and collars, commitments to fund mortgages for sale into the secondary market (interest rate locks), forward commitments to end investors for the sale of mortgage loans, commodity future contracts and foreign currency contracts. Interest rate swaps, caps and collars and commodity future contracts are valued by a third party, using models that primarily use market observable inputs, such as yield curves and commodity prices prevailing at the measurement date, and are classified as Level 2 in the fair value hierarchy. The credit risk associated with derivative financial instruments that are subject to master netting agreements is measured on a net basis by counterparty portfolio. The fair value for mortgage-related derivatives is based on changes in mortgage rates from the date of the commitments. The fair value of foreign currency derivatives is computed based on change in foreign currency rates stated in the contract compared to those prevailing at the measurement date. At March 31, 2023, the Company classified $5.4 million of derivative assets related to interest rate locks as Level 3. The fair value of interest rate locks is based on prices obtained for loans with similar characteristics from third parties, adjusted for the pull-through rate, which represents the Company’s best estimate of the likelihood that a committed loan will ultimately fund. The weighted-average pull-through rate at March 31, 2023 was 82.06% with pull-through rates applied ranging from 31% to 100%. Pull-through rates are directly related to the fair value of interest rate locks as an increase in the pull-through rate results in an increased valuation. Nonqualified deferred compensation assets —The underlying assets relating to the nonqualified deferred compensation plan are included in a trust and primarily consist of non-exchange traded institutional funds which are priced based by an independent third party service. These assets are classified as Level 2 in the fair value hierarchy. The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented: March 31, 2023 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 4,948 $ 4,948 $ — $ — U.S. government agencies 74,862 — 74,862 — Municipal 160,386 — 48,129 112,257 Corporate notes 83,675 — 83,675 — Mortgage-backed 2,935,974 — 2,935,974 — Trading account securities 102 — 102 — Equity securities with readily determinable fair value 111,943 103,877 8,066 — Mortgage loans held-for-sale 302,493 — 258,243 44,250 Loans held-for-investment 202,143 — 132,650 69,493 MSRs 224,470 — — 224,470 Nonqualified deferred compensation assets 14,379 — 14,379 — Derivative assets 274,004 — 268,648 5,356 Total $ 4,389,379 $ 108,825 $ 3,824,728 $ 455,826 Derivative liabilities $ 274,432 $ — $ 274,432 $ — December 31, 2022 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 14,948 $ 14,948 $ — $ — U.S. government agencies 74,222 — 74,222 — Municipal 168,655 — 51,118 117,537 Corporate notes 85,705 — 85,705 — Mortgage-backed 2,899,487 — 2,899,487 — Trading account securities 1,127 — 1,127 — Equity securities with readily determinable fair value 110,365 102,299 8,066 — Mortgage loans held-for-sale 299,935 — 251,280 48,655 Loans held-for-investment 179,932 — 95,767 84,165 MSRs 230,225 — — 230,225 Nonqualified deferred compensation assets 13,899 — 13,899 — Derivative assets 296,848 — 295,137 1,711 Total $ 4,375,348 $ 117,247 $ 3,775,808 $ 482,293 Derivative liabilities $ 338,078 $ — $ 338,078 $ — March 31, 2022 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 49,637 — 49,637 — Municipal 155,489 — 55,088 100,401 Corporate notes 82,939 — 82,939 — Mortgage-backed 2,710,833 — 2,710,833 — Trading account securities 852 — 852 — Equity securities with readily determinable fair value 92,689 84,623 8,066 — Mortgage loans held-for-sale 606,545 — 606,545 — Loans held-for-investment 57,984 — 13,520 44,464 MSRs 199,146 — — 199,146 Nonqualified deferred compensation assets 15,447 — 15,447 — Derivative assets 153,534 — 150,087 3,447 Total $ 4,125,095 $ 84,623 $ 3,693,014 $ 347,458 Derivative liabilities $ 122,107 $ — $ 122,107 $ — The aggregate remaining contractual principal balance outstanding as of March 31, 2023, December 31, 2022 and March 31, 2022 for mortgage loans held-for-sale measured at fair value under ASC 825 was $307.3 million, $308.9 million and $606.7 million, respectively, while the aggregate fair value of mortgage loans held-for-sale was $302.5 million, $299.9 million and $606.5 million, for the same respective periods, as shown in the above tables. At March 31, 2023, $3.3 million of mortgage loans held-for-sale were classified as nonaccrual as compared to $5.8 million as of December 31, 2022 and none as of March 31, 2022. Additionally, there were $41.4 million of loans past due greater than 90 days and still accruing in the mortgage loans held-for-sale portfolio as of March 31, 2023 compared to $44.0 million as of December 31, 2022 and $113.0 million as of March 31, 2022. All of the nonaccrual loans and loans past due greater than 90 days and still accruing within the mortgage loans held-for-sale portfolio at March 31, 2023, December 31, 2022, and March 31, 2022 were individual delinquent mortgage loans bought back from GNMA at the unconditional option of the Company as servicer for those loans. The aggregate remaining contractual principal balance outstanding as of March 31, 2023, December 31, 2022 and March 31, 2022 for mortgage loans held-for-investment measured at fair value under ASC 825 was $204.5 million, $184.0 million and $58.7 million, respectively, while the aggregate fair value of mortgage loans held-for-investment was $202.1 million, $179.9 million and $58.0 million, respectively, as shown in the above tables. The changes in Level 3 assets measured at fair value on a recurring basis during the three months ended March 31, 2023 and 2022 are summarized as follows: Mortgage loans held-for-sale U.S. Government agencies Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at January 1, 2023 $ 117,537 $ 48,655 $ — $ 84,165 $ 230,225 $ 1,711 Total net (losses) gains included in: Net income (1) — 466 — 364 (5,755) 3,645 Other comprehensive income or loss (1,662) — — — — — Purchases 4,418 — — — — — Issuances — — — — — — Sales — — — — — — Settlements (8,036) (18,619) — (20,322) — — Net transfers into Level 3 — 13,748 — 5,286 — — Balance at March 31, 2023 $ 112,257 $ 44,250 $ — $ 69,493 $ 224,470 $ 5,356 (1) Changes in the balance of mortgage loans held-for-sale, MSRs, and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. Mortgage loans held-for-sale U.S. Government agencies Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at January 1, 2022 $ 105,687 $ — $ — $ 15,891 $ 147,571 $ 10,560 Total net gains (losses) included in: Net income (1) — — — (772) 51,575 (7,113) Other comprehensive income or loss (5,449) — — — — — Purchases 1,246 — — — — — Issuances — — — — — — Sales — — — — — — Settlements (1,083) — — (1,667) — — Net transfers into Level 3 — — — 31,012 — — Balance at March 31, 2022 $ 100,401 $ — $ — $ 44,464 $ 199,146 $ 3,447 (1) Changes in the balance of mortgage loans held-for-sale, MSRs, and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. Also, the Company may be required, from time to time, to measure certain other assets at fair value on a non-recurring basis in accordance with GAAP. These adjustments to fair value usually result from impairment charges on individual assets. For assets measured at fair value on a non-recurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at March 31, 2023: March 31, 2023 Three Months Ended March 31, 2023 Fair Value Losses Recognized, net (In thousands) Total Level 1 Level 2 Level 3 Individually assessed loans - foreclosure probable and collateral-dependent $ 71,622 $ — $ — $ 71,622 $ 2,501 Other real estate owned (1) 9,361 — — 9,361 104 Total $ 80,983 $ — $ — $ 80,983 $ 2,605 (1) Fair value losses recognized, net on other real estate owned include valuation adjustments and charge-offs during the respective period. Individually assessed loans —In accordance with ASC 326, the allowance for credit losses for loans and other financial assets held at amortized cost should be measured on a collective or pooled basis when such assets exhibit similar risk characteristics. In instances in which a financial asset does not exhibit similar risk characteristics to a pool, the Company is required to measure such allowance for credit losses on an individual asset basis. For the Company’s loan portfolio, nonaccrual loans are considered to not exhibit similar risk characteristics as pools and thus are individually assessed. Credit losses are measured by estimating the fair value of the loan based on the present value of expected cash flows, the market price of the loan, or the fair value of the underlying collateral. Individually assessed loans are considered a fair value measurement where an allowance for credit loss is established based on the fair value of collateral. Appraised values on relevant real estate properties, which may require adjustments to market-based valuation inputs, are generally used on foreclosure probable and collateral-dependent loans within the real estate portfolios. The Company’s Managed Assets Division is primarily responsible for the valuation of Level 3 inputs of individually assessed loans. For more information on individually assessed loans refer to Note (6) “Allowance for Credit Losses”. At March 31, 2023, the Company had $71.6 million of individually assessed loans classified as Level 3. All of the $71.6 million of individually assessed loans were measured at fair value based on the underlying collateral of the loan as shown in the table above. None were valued based on discounted cash flows in accordance with ASC 310. Other real estate owned —Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense. Fair value is generally based on third party appraisals and internal estimates that are adjusted by a discount representing the estimated cost of sale and is therefore considered a Level 3 valuation. The Company’s Managed Assets Division is primarily responsible for the valuation of Level 3 inputs for other real estate owned. At March 31, 2023, the Company had $9.4 million of other real estate owned classified as Level 3. The unobservable input applied to other real estate owned relates to the 10% reduction to the appraisal value representing the estimated cost of sale of the foreclosed property. A higher discount for the estimated cost of sale results in a decreased carrying value. The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at March 31, 2023 were as follows: (Dollars in thousands) Fair Value Valuation Methodology Significant Unobservable Input Range Weighted Impact to valuation Measured at fair value on a recurring basis: Municipal securities $ 112,257 Bond pricing Equivalent rating BBB-AA+ N/A Increase Mortgage loans held-for-sale 44,250 Discounted cash flows Discount rate 5.96% 5.96% Decrease Credit discount 0% - 10% 0.22% Decrease Loans held-for-investment 69,493 Discounted cash flows Discount rate 5.96% - 6.25% 5.98% Decrease Credit discount 0% - 13% 0.86% Decrease Constant prepayment rate (CPR) - current loans 6.92% 6.92% Decrease Average life - delinquent loans (in years) 1.2 years - 10.2 years 5.4 years Decrease MSRs 224,470 Discounted cash flows Discount rate 3% - 33% 10.33% Decrease Constant prepayment rate (CPR) 0% - 100% 6.92% Decrease Cost of servicing $70 - $200 $ 76 Decrease Cost of servicing - delinquent $200 - 1,000 $ 403 Decrease Derivatives 5,356 Discounted cash flows Pull-through rate 31% - 100% 82.06 % Increase Measured at fair value on a non-recurring basis: Individually assessed loans - foreclosure probable and collateral-dependent 71,622 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 9,361 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease The Company is required under applicable accounting guidance to report the fair value of all financial instruments on the Consolidated Statements of Condition, including those financial instruments carried at cost. The table below presents the carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown: At March 31, 2023 At December 31, 2022 At March 31, 2022 Carrying Fair Carrying Fair Carrying Fair (In thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 445,986 $ 445,986 $ 490,966 $ 490,966 $ 462,572 $ 462,572 Securities sold under agreements to repurchase with original maturities exceeding three months — — — — 700,000 700,000 Interest-bearing deposits with banks 1,563,578 1,563,578 1,988,719 1,988,719 4,013,597 4,013,597 Available-for-sale securities 3,259,845 3,259,845 3,243,017 3,243,017 2,998,898 2,998,898 Held-to-maturity securities 3,606,391 2,976,198 3,640,567 2,949,821 3,435,729 3,146,427 Trading account securities 102 102 1,127 1,127 852 852 Equity securities with readily determinable fair value 111,943 111,943 110,365 110,365 92,689 92,689 FHLB and FRB stock, at cost 244,957 244,957 224,759 224,759 136,163 136,163 Brokerage customer receivables 16,042 16,042 16,387 16,387 22,888 22,888 Mortgage loans held-for-sale, at fair value 302,493 302,493 299,935 299,935 606,545 606,545 Loans held-for-investment, at fair value 202,143 202,143 179,932 179,932 57,984 57,984 Loans held-for-investment, at amortized cost 39,363,328 38,577,761 39,016,553 38,018,678 35,222,563 35,989,840 Nonqualified deferred compensation assets 14,379 14,379 13,899 13,899 15,447 15,447 Derivative assets 274,004 274,004 296,848 296,848 153,534 153,534 Accrued interest receivable and other 417,066 417,066 379,719 379,719 278,873 278,873 Total financial assets $ 49,822,257 $ 48,406,497 $ 49,902,793 $ 48,214,172 $ 48,198,334 $ 48,676,309 Financial Liabilities Non-maturity deposits $ 37,366,959 $ 37,366,959 $ 38,167,409 $ 38,167,409 $ 38,483,327 $ 38,483,327 Deposits with stated maturities 5,351,252 4,970,556 4,735,135 4,085,058 3,735,995 3,735,750 FHLB advances 2,316,071 2,255,580 2,316,071 2,219,983 1,241,071 1,193,080 Other borrowings 583,548 555,615 596,614 569,342 482,516 483,202 Subordinated notes 437,493 410,827 437,392 409,395 437,033 446,711 Junior subordinated debentures 253,566 252,663 253,566 253,405 253,566 268,913 Derivative liabilities 274,432 274,432 338,078 338,078 122,107 122,107 Accrued interest payable 42,015 42,015 22,176 22,176 14,269 14,269 Total financial liabilities $ 46,625,336 $ 46,128,647 $ 46,866,441 $ 46,064,846 $ 44,769,884 $ 44,747,359 Not all the financial instruments listed in the table above are subject to the disclosure provisions of ASC Topic 820, as certain assets and liabilities result in their carrying value approximating fair value. These include cash and cash equivalents, interest-bearing deposits with banks, brokerage customer receivables, FHLB and FRB stock, accrued interest receivable and accrued interest payable and non-maturity deposits. The following methods and assumptions were used by the Company in estimating fair values of financial instruments that were not previously disclosed. Held-to-maturity securities. Held-to-maturity securities include U.S. government-sponsored agency securities, municipal bonds issued by various municipal government entities primarily located in the Chicago metropolitan area and southern Wisconsin and mortgage-backed securities. Fair values for held-to-maturity securities are typically based on prices obtained from independent pricing vendors. In accordance with ASC 820, the Company has generally categorized these held-to-maturity securities as a Level 2 fair value measurement. Fair values for certain other held-to-maturity securities are based on the bond pricing methodology discussed previously related to certain available-for-sale securities. In accordance with ASC 820, the Company has categorized these held-to-maturity securities as a Level 3 fair value measurement. Loans held-for-investment, at amortized cost. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are analyzed by type such as commercial, residential real estate, etc. Each category is further segmented by interest rate type (fixed and variable) and term. For variable-rate loans that reprice frequently, estimated fair values are based on carrying values. The fair value of residential loans is based on secondary market sources for securities backed by similar loans, adjusted for differences in loan characteristics. The fair value for other fixed rate loans is estimated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect credit and interest rate risks inherent in the loan. In accordance with ASC 820, the Company has categorized loans as a Level 3 fair value measurement. Deposits with stated maturities. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently in effect for deposits of similar remaining maturities. In accordance with ASC 820, the Company has categorized deposits with stated maturities as a Level 3 fair value measurement. FHLB advances. The fair value of FHLB advances is obtained from the FHLB which uses a discounted cash flow analysis based on current market rates of similar maturity debt securities to discount cash flows. In accordance with ASC 820, the Company has categorized FHLB advances as a Level 3 fair value measurement. Subordinated notes. The fair value of the subordinated notes is based on a market price obtained from an independent pricing vendor. In accordance with ASC 820, the Company has categorized subordinated notes as a Level 2 fair value measurement.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	3 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans As of March 31, 2023, approximately 1.2 million shares were available for future grants, assuming the maximum number of shares are issued for the performance awards outstanding, approved under the Company Stock Incentive Plans (“the Plans”). Descriptions of the Plans are included in Note (18) “Stock Compensation Plans and Other Employee Benefit Plans” of the 2022 Form 10-K. Stock-based compensation expense recognized in the Consolidated Statements of Income was $8.3 million in the first quarter of 2023 and $7.9 million in the first quarter of 2022. A summary of the Plans’ stock option activity for the three months ended March 31, 2023 and March 31, 2022 is presented below: Stock Options Common Weighted Remaining Contractual Term (1) Intrinsic Value (2) (in thousands) Outstanding at January 1, 2023 68,093 $ 41.14 Granted — — Exercised (54,218) 40.87 Forfeited or canceled — — Outstanding at March 31, 2023 13,875 $ 42.18 4.7 $ 427 Exercisable at March 31, 2023 13,875 $ 42.18 4.7 $ 427 Stock Options Common Weighted Remaining Contractual Term (1) Intrinsic Value (2) (in thousands) Outstanding at January 1, 2022 193,447 $ 41.62 Granted — — Exercised (79,376) 42.32 Forfeited or canceled (771) 40.87 Outstanding at March 31, 2022 113,300 $ 41.13 1.4 $ 5,869 Exercisable at March 31, 2022 113,300 $ 41.13 1.4 $ 5,869 (1) Represents the remaining weighted average contractual life in years. (2) Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company’s stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock. The aggregate intrinsic value of options exercised during the three months ended March 31, 2023 and March 31, 2022, was $2.5 million and $4.5 million, respectively. Cash received from option exercises under the Plans for the three months ended March 31, 2023 and March 31, 2022 was $2.2 million and $3.4 million, respectively. A summary of the Plans’ restricted share activity for the three months ended March 31, 2023 and March 31, 2022 is presented below: Three months ended March 31, 2023 Three months ended March 31, 2022 Restricted Shares Common Weighted Common Weighted Outstanding at January 1 610,155 $ 73.21 476,813 $ 61.33 Granted 242,576 89.82 194,849 97.30 Vested and issued (96,649) 64.14 (52,465) 65.42 Forfeited or canceled (1,968) 77.37 (3,615) 66.37 Outstanding at March 31 754,114 $ 79.70 615,582 $ 72.34 Vested, but deferred, at March 31 97,888 $ 53.30 95,806 $ 52.67 A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the three months ended March 31, 2023 and March 31, 2022 is presented below: Three months ended March 31, 2023 Three months ended March 31, 2022 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 545,379 $ 70.30 557,255 $ 62.94 Granted 185,514 92.48 159,202 97.21 Added by performance factor at vesting 23,161 63.64 — — Vested and issued (178,203) 63.64 — — Forfeited or canceled (2,301) 78.20 (159,952) 71.56 Outstanding at March 31 573,550 $ 79.24 556,505 $ 70.27 Vested, but deferred, at March 31 35,852 $ 44.59 35,285 $ 43.88

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income or Loss and Earnings Per Share	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Income or Loss and Earnings Per Share	Accumulated Other Comprehensive Income or Loss and Earnings Per Share Accumulated Other Comprehensive Income or Loss The following tables summarize the components of other comprehensive income or loss, including the related income tax effects, and the related amount reclassified to net income for the periods presented: (In thousands) Accumulated Accumulated Accumulated Total Balance at January 1, 2023 $ (386,057) $ 7,381 $ (48,960) $ (427,636) Other comprehensive income during the period, net of tax, before reclassifications 34,503 22,808 710 58,021 Amount reclassified from accumulated other comprehensive loss into net income, net of tax (409) 2,620 — 2,211 Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax (32) — — (32) Net other comprehensive income during the period, net of tax $ 34,062 $ 25,428 $ 710 $ 60,200 Balance at March 31, 2023 $ (351,995) $ 32,809 $ (48,250) $ (367,436) Balance at January 1, 2022 $ 8,724 $ 27,111 $ (31,743) $ 4,092 Other comprehensive (loss) income during the period, net of tax, before reclassifications (151,114) 25,023 2,288 (123,803) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (183) 3,926 — 3,743 Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax (31) — — (31) Net other comprehensive (loss) income during the period, net of tax $ (151,328) $ 28,949 $ 2,288 $ (120,091) Balance at March 31, 2022 $ (142,604) $ 56,060 $ (29,455) $ (115,999) (In thousands) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Details Regarding the Component of Accumulated Other Comprehensive Income (Loss) Three Months Ended Impacted Line on the March 31, 2023 2022 Accumulated unrealized gains on securities Gains included in net income $ 560 $ 250 Gains (losses) on investment securities, net 560 250 Income before taxes Tax effect (151) (67) Income tax expense Net of tax $ 409 $ 183 Net income Accumulated unrealized gains on derivative instruments Amount reclassified to interest income on loans $ 9,072 $ — Interest on Loans Amount reclassified to interest expense on deposits $ (5,588) $ 4,819 Interest on deposits Amount reclassified to interest expense on other borrowings 88 534 Interest on other borrowings (3,572) (5,353) Income before taxes Tax effect 952 1,427 Income tax expense Net of tax $ (2,620) $ (3,926) Net income Earnings per Share The following table shows the computation of basic and diluted earnings per share for the periods indicated: Three Months Ended (In thousands, except per share data) March 31, March 31, Net income $ 180,198 $ 127,391 Less: Preferred stock dividends 6,991 6,991 Net income applicable to common shares (A) $ 173,207 $ 120,400 Weighted average common shares outstanding (B) 60,950 57,196 Effect of dilutive potential common shares Common stock equivalents 873 862 Weighted average common shares and effect of dilutive potential common shares (C) 61,823 58,058 Net income per common share: Basic (A/B) $ 2.84 $ 2.11 Diluted (A/C) $ 2.80 $ 2.07 Potentially dilutive common shares can result from stock options, restricted stock unit awards and shares to be issued under the Employee Stock Purchase Plan and the Directors Deferred Fee and Stock Plan, being treated as if they had been either exercised or issued, computed by application of the treasury stock method. While potentially dilutive common shares are typically included in the computation of diluted earnings per share, potentially dilutive common shares are excluded from this computation in periods in which the effect of inclusion would either reduce the loss per share or increase the income per share.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn April 3, 2023, the Company completed its acquisition of Rothschild & Co Asset Management US Inc. and Rothschild & Co Risk Based Investments LLC (collectively, “Rothschild & Co Asset Management U.S.”), from Rothschild & Co North America Inc. The acquired entities were merged into the Company’s subsidiary, Great Lakes Advisors, LLC.

Recent Accounting Developments

Recent Accounting Developments (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	The interim consolidated financial statements of Wintrust Financial Corporation and its subsidiaries (collectively, “Wintrust” or the “Company”) presented herein are unaudited, but in the opinion of management, reflect all necessary adjustments of a normal or recurring nature for a fair presentation of results as of the dates and for the periods covered by the interim consolidated financial statements. The accompanying interim consolidated financial statements are unaudited and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations or cash flows in accordance with U.S. generally accepted accounting principles (“GAAP”). The interim unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (“2022 Form 10-K”). Operating results reported for the period are not necessarily indicative of the results which may be expected for the entire year. Reclassifications of certain prior period amounts have been made to conform to the current period presentation. The preparation of the financial statements requires management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities. Management believes that the estimates made are reasonable; however, changes in estimates may be required if economic or other conditions develop differently from management’s expectations. Certain policies and accounting principles inherently have a greater reliance on the use of estimates, assumptions and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Management views critical accounting policies to be those which are highly dependent on subjective or complex judgments, estimates and assumptions, and where changes in those estimates and assumptions could have a significant impact on the financial statements. Management currently views the determination of the allowance for credit losses, including the allowance for loan losses, the allowance for unfunded commitment losses and the allowance for held-to-maturity securities losses, estimations of fair value, the valuations required for impairment testing of goodwill, the valuation and accounting for derivative instruments and income taxes as the accounting areas that require the most subjective and complex judgments, and as such could be the most subject to revision as new information becomes available. Descriptions of the Company’s significant accounting policies are included in Note (1) “Summary of Significant Accounting Policies” of the 2022 Form 10-K. In preparation of these financial statements, subsequent events were evaluated through the time the financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users or filed with the SEC.
Recent Accounting Developments	Business Combinations 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 clarifies diversity in practice related to recognition and measurement of contract assets and liabilities related to revenue contracts with customers which are acquired in a business combination by aligning business combination accounting with the subsequent accounting for contract assets and liabilities by requiring entities to apply ASC Topic 606, Revenue from Contracts with Customers, in order to recognize and measure deferred revenue in a business combination. The guidance also creates an exception to the general recognition and measurement principle in ASC Topic 805, Business Combinations, under which such amounts are recognized by the acquirer at fair value on the acquisition date by providing two practical expedients for acquirers. The Company adopted ASU No. 2021-08 as of January 1, 2023. Adoption of this standard did not have a material impact on the Company’s consolidated financial statements. 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 by allowing multiple hedged layers to be designated for a single closed portfolio of financial assets or one or more beneficial interests secured by a portfolio of financial instruments. The Company adopted ASU No. 2022-01 as of January 1, 2023. Adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU No. 2022-02, “Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures” which eliminates the separate recognition and measurement guidance for troubled debt restructurings (“TDRs”) by creditors, while enhancing disclosure requirements for certain loan refinancing and restructurings by creditors when a borrower is experiencing financial difficulty, and requiring entities to disclose current-period gross write-offs by year of origination for certain financing receivables and net investments in leases. The Company adopted ASU No. 2022-02 as of January 1, 2023. Guidance was adopted under a modified retrospective approach and, at January 1, 2023, the Company recognized a cumulative-effect adjustment to the allowance for loan losses of $741,000 representing the change in methodology of estimating expected credit losses for loans previously classified as TDRs. This amount was a positive adjustment to the allowance for loan losses, presented separately on the Company’s Consolidated Statements of Condition, with an offsetting negative adjustment recorded directly to retained earnings, net of taxes. Fair Value Measurement - Equity Securities with 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 the guidance in ASC 820 when measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security, and also requires specific disclosures related to these types of securities. This guidance is effective for fiscal years beginning after December 15, 2023, including interim periods therein, and is to be applied under a prospective approach. Early adoption is permitted. The Company does not expect this guidance to have a material impact on the Company’s consolidated financial statements. Legislation Issued Related to Stock Repurchases On August 16, 2022, the Inflation Reduction Act of 2022 (the “IRA”) was signed by the President of the United States. Among other things, the IRA imposes a 1% excise tax on the fair market value of stock repurchased after December 31, 2022. With certain exceptions, the value of stock repurchased is determined net of stock issued in the year, including shares issued pursuant to compensatory arrangements. This new legislation did not have a material impact on the Company's consolidated financial statements. Equity Method and Joint Ventures - Investments in Tax Credit Structures
Cash and Cash Equivalents	For purposes of the Consolidated Statements of Cash Flows, the Company considers cash and cash equivalents to include cash on hand, cash items in the process of collection, non-interest bearing amounts due from correspondent banks, federal funds sold and securities purchased under resale agreements with original maturities of three months or less. These items are included within the Company’s Consolidated Statements of Condition as cash and due from banks, and federal funds sold and securities purchased under resale agreements.

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Investment Securities	The following tables are a summary of the investment securities portfolios as of the dates shown: March 31, 2023 (In thousands) Amortized Gross Gross Fair Available-for-sale securities U.S. Treasury $ 4,947 $ 1 $ — $ 4,948 U.S. government agencies 80,000 — (5,138) 74,862 Municipal 164,110 439 (4,163) 160,386 Corporate notes: Financial issuers 93,995 — (11,320) 82,675 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 3,300,048 1,787 (445,405) 2,856,430 Collateralized mortgage obligations 95,880 — (16,336) 79,544 Total available-for-sale securities $ 3,739,980 $ 2,227 $ (482,362) $ 3,259,845 Held-to-maturity securities U.S. government agencies $ 339,608 $ 24 $ (70,064) $ 269,568 Municipal 174,720 1,117 (2,880) 172,957 Mortgage-backed: (1) Mortgage-backed securities 2,872,591 1,197 (533,415) 2,340,373 Collateralized mortgage obligations 161,874 — (22,431) 139,443 Corporate notes 58,061 14 (4,218) 53,857 Total held-to-maturity securities $ 3,606,854 $ 2,352 $ (633,008) $ 2,976,198 Less: Allowance for credit losses (463) Held-to-maturity securities, net of allowance for credit losses $ 3,606,391 Equity securities with readily determinable fair value $ 116,296 $ 3,065 $ (7,418) $ 111,943 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. December 31, 2022 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ 14,943 $ 5 $ — $ 14,948 U.S. government agencies 80,000 36 (5,814) 74,222 Municipal 173,861 230 (5,436) 168,655 Corporate notes: Financial issuers 93,994 — (9,291) 84,703 Other 1,000 2 — 1,002 Mortgage-backed: (1) Mortgage-backed securities 3,308,494 238 (488,795) 2,819,937 Collateralized mortgage obligations 97,342 — (17,792) 79,550 Total available-for-sale securities $ 3,769,634 $ 511 $ (527,128) $ 3,243,017 Held-to-maturity securities U.S. government agencies $ 339,614 $ — $ (75,293) $ 264,321 Municipal 179,027 477 (4,066) 175,438 Mortgage-backed: (1) Mortgage-backed securities 2,900,031 — (583,682) 2,316,349 Collateralized mortgage obligations 164,151 — (23,322) 140,829 Corporate notes 58,232 — (5,348) 52,884 Total held-to-maturity securities $ 3,641,055 $ 477 $ (691,711) $ 2,949,821 Less: Allowance for credit losses (488) Held-to-maturity securities, net of allowance for credit losses $ 3,640,567 Equity securities with readily determinable fair value $ 115,552 $ 2,935 $ (8,122) $ 110,365 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. March 31, 2022 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 50,000 366 (729) 49,637 Municipal 157,563 1,019 (3,093) 155,489 Corporate notes: Financial issuers 86,994 1 (5,047) 81,948 Other 1,000 — (9) 991 Mortgage-backed: (1) Mortgage-backed securities 2,794,760 591 (177,899) 2,617,452 Collateralized mortgage obligations 103,424 1 (10,044) 93,381 Total available-for-sale securities $ 3,193,741 $ 1,978 $ (196,821) $ 2,998,898 Held-to-maturity securities U.S. government agencies $ 264,661 $ 35 $ (27,673) $ 237,023 Municipal 180,548 3,176 (1,693) 182,031 Mortgage-backed: (1) Mortgage-backed securities 2,772,622 — (253,254) 2,519,368 Collateralized mortgage obligations 174,273 — (6,847) 167,426 Corporate notes 43,784 — (3,205) 40,579 Total held-to-maturity securities $ 3,435,888 $ 3,211 $ (292,672) $ 3,146,427 Less: Allowance for credit losses (159) Held-to-maturity securities, net of allowance for credit losses $ 3,435,729 Equity securities with readily determinable fair value $ 91,629 $ 5,259 $ (4,199) $ 92,689 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime.
Schedule of Investment Securities Portfolio Continuous Unrealized Loss Position, Available for Sale Debt Securities	The following table presents the portion of the Company’s available-for-sale investment securities portfolios that have gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at March 31, 2023: Continuous unrealized Continuous unrealized Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale securities U.S. government agencies $ 29,945 $ (55) $ 44,917 $ (5,083) $ 74,862 $ (5,138) Municipal 58,695 (624) 55,413 (3,539) 114,108 (4,163) Corporate notes: Financial issuers 9,912 (87) 72,763 (11,233) 82,675 (11,320) Mortgage-backed: (1) Mortgage-backed securities 219,643 (7,558) 2,297,025 (437,847) 2,516,668 (445,405) Collateralized mortgage obligations 72 (1) 79,472 (16,335) 79,544 (16,336) Total available-for-sale securities $ 318,267 $ (8,325) $ 2,549,590 $ (474,037) $ 2,867,857 $ (482,362) (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime.
Schedule of Gross Gains and Gross Losses Realized and Proceeds For Investment Securities	The following table provides information as to the amount of gross gains and losses, adjustments and impairment on investment securities recognized in earnings and proceeds received through the sale or call of investment securities: Three months ended March 31, (In thousands) 2023 2022 Realized gains on investment securities $ 605 $ 258 Realized losses on investment securities (45) (8) Net realized gains on investment securities 560 250 Unrealized gains on equity securities with readily determinable fair value 2,290 180 Unrealized losses on equity securities with readily determinable fair value (1,452) (2,641) Net unrealized gains (losses) on equity securities with readily determinable fair value 838 (2,461) Upward adjustments of equity securities without readily determinable fair values — — Downward adjustments of equity securities without readily determinable fair values — — Impairment of equity securities without readily determinable fair values — (571) Adjustment and impairment, net, of equity securities without readily determinable fair values — (571) Gains (losses) on investment securities, net $ 1,398 $ (2,782) Proceeds from sales of available-for-sale securities (1) $ — $ — Proceeds from sales of equity securities with readily determinable fair value 23,592 18,753 Proceeds from sales and capital distributions of equity securities without readily determinable fair value 67 250 (1) Includes proceeds from available-for-sale securities sold in accordance with written covered call options sold to a third party.
Schedule of Contractual Maturities of Investment Securities	The amortized cost and fair value of available-for-sale and held-to-maturity investment securities as of March 31, 2023, December 31, 2022 and March 31, 2022, by contractual maturity, are shown in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties: March 31, 2023 December 31, 2022 March 31, 2022 (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities Due in one year or less $ 108,880 $ 108,429 $ 119,830 $ 119,275 $ 48,130 $ 47,945 Due in one to five years 131,959 122,172 63,644 61,701 67,138 66,034 Due in five to ten years 39,019 35,158 115,734 105,076 110,960 105,670 Due after ten years 64,194 58,112 64,590 57,478 69,329 68,416 Mortgage-backed 3,395,928 2,935,974 3,405,836 2,899,487 2,898,184 2,710,833 Total available-for-sale securities $ 3,739,980 $ 3,259,845 $ 3,769,634 $ 3,243,017 $ 3,193,741 $ 2,998,898 Held-to-maturity securities Due in one year or less $ 2,302 $ 2,300 $ 1,340 $ 1,332 $ 1,208 $ 1,213 Due in one to five years 98,207 93,717 94,705 89,093 83,085 80,210 Due in five to ten years 110,967 110,892 115,318 113,758 101,410 102,940 Due after ten years 360,913 289,473 365,510 288,460 303,290 275,270 Mortgage-backed 3,034,465 2,479,816 3,064,182 2,457,178 2,946,895 2,686,794 Total held-to-maturity securities $ 3,606,854 $ 2,976,198 $ 3,641,055 $ 2,949,821 $ 3,435,888 $ 3,146,427 Less: Allowance for credit losses (463) (488) (159) Held-to-maturity securities, net of allowance for credit losses $ 3,606,391 $ 3,640,567 $ 3,435,729

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2023
Loans and Leases Receivable Disclosure [Abstract]
Summary of Loan Portfolio	The following table shows the Company’s loan portfolio by category as of the dates shown: March 31, December 31, March 31, (Dollars in thousands) 2023 2022 2022 Balance: Commercial $ 12,576,985 $ 12,549,164 $ 11,583,963 Commercial real estate 10,239,078 9,950,947 9,235,074 Home equity 337,016 332,698 321,435 Residential real estate 2,505,545 2,372,383 1,799,985 Premium finance receivables Property and casualty insurance 5,738,880 5,849,459 4,937,408 Life insurance 8,125,802 8,090,998 7,354,163 Consumer and other 42,165 50,836 48,519 Total loans, net of unearned income $ 39,565,471 $ 39,196,485 $ 35,280,547 Mix: Commercial 32 % 32 % 33 % Commercial real estate 26 25 26 Home equity 1 1 1 Residential real estate 6 6 5 Premium finance receivables Property and casualty insurance 14 15 14 Life insurance 21 21 21 Consumer and other 0 0 0 Total loans, net of unearned income 100 % 100 % 100 %

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2023
Credit Loss [Abstract]
Schedule of Aging of the Company's Loan Portfolio	The tables below show the aging of the Company’s loan portfolio by the segmentation noted above at March 31, 2023, December 31, 2022 and March 31, 2022: As of March 31, 2023 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances (includes PCD): Commercial Commercial, industrial and other $ 47,950 $ — $ 10,755 $ 95,593 $ 12,422,687 $ 12,576,985 Commercial real estate Construction and development 5,404 — 4,438 19,616 1,567,595 1,597,053 Non-construction 5,792 — 16,101 53,064 8,567,068 8,642,025 Home equity 1,190 — 116 1,118 334,592 337,016 Residential real estate, excluding early buy-out loans 11,333 104 74 19,183 2,278,699 2,309,393 Premium finance receivables Property and casualty insurance loans 18,543 9,215 14,287 32,545 5,664,290 5,738,880 Life insurance loans — 1,066 21,552 52,975 8,050,209 8,125,802 Consumer and other 6 87 10 379 41,683 42,165 Total loans, net of unearned income, excluding early buy-out loans $ 90,218 $ 10,472 $ 67,333 $ 274,473 $ 38,926,823 $ 39,369,319 Early buy-out loans guaranteed by U.S. government agencies (1) 29,245 36,920 — 1,485 128,502 196,152 Total loans, net of unearned income $ 119,463 $ 47,392 $ 67,333 $ 275,958 $ 39,055,325 $ 39,565,471 As of December 31, 2022 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances (includes PCD): Commercial Commercial, industrial and other $ 35,579 $ 462 $ 21,128 $ 56,696 $ 12,435,299 $ 12,549,164 Commercial real estate Construction and development 416 — 361 14,390 1,471,763 1,486,930 Non-construction 5,971 — 1,883 16,285 8,439,878 8,464,017 Home equity 1,487 — — 2,152 329,059 332,698 Residential real estate, excluding early buy-out loans 10,171 — 4,364 9,982 2,183,078 2,207,595 Premium finance receivables Property and casualty insurance loans 13,470 15,841 14,926 40,557 5,764,665 5,849,459 Life insurance loans — 17,245 5,260 68,725 7,999,768 8,090,998 Consumer and other 6 49 18 224 50,539 50,836 Total loans, net of unearned income, excluding early buy-out loans $ 67,100 $ 33,597 $ 47,940 $ 209,011 $ 38,674,049 $ 39,031,697 Early buy-out loans guaranteed by U.S. government agencies (1) 31,279 47,450 984 1,584 83,491 164,788 Total loans, net of unearned income $ 98,379 $ 81,047 $ 48,924 $ 210,595 $ 38,757,540 $ 39,196,485 (1) Early buy-out loans are insured or guaranteed by the FHA or the U.S. Department of Veterans Affairs, subject to indemnifications and insurance limits for certain loans. As of March 31, 2022 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances (includes PCD): Commercial Commercial, industrial and other $ 16,878 $ — $ 1,294 $ 31,889 $ 11,533,902 $ 11,583,963 Commercial real estate Construction and development 1,054 — — 1,409 1,393,943 1,396,406 Non-construction 11,247 — 2,648 28,732 7,796,041 7,838,668 Home equity 1,747 — 199 545 318,944 321,435 Residential real estate, excluding early buy-out loans 7,262 — 293 18,808 1,723,526 1,749,889 Premium finance receivables Property and casualty insurance loans 6,707 12,363 8,890 21,278 4,888,170 4,937,408 Life insurance loans — — 22,401 15,522 7,316,240 7,354,163 Consumer and other 4 43 5 221 48,246 48,519 Total loans, net of unearned income, excluding early buy-out loans $ 44,899 $ 12,406 $ 35,730 $ 118,404 $ 35,019,012 $ 35,230,451 Early buy-out loans guaranteed by U.S. government agencies (1) 4,661 28,958 — 185 16,292 50,096 Total loans, net of unearned income $ 49,560 $ 41,364 $ 35,730 $ 118,589 $ 35,035,304 $ 35,280,547
Summary of Loan Portfolio by Credit Quality Indicator	The table below shows the Company’s loan portfolio by credit quality indicator and year of origination at March 31, 2023: Year of Origination Revolving Total (In thousands) 2023 2022 2021 2020 2019 Prior Revolving to Term Loans Loan Balances: Commercial, industrial and other Pass $ 752,119 $ 2,576,073 $ 2,081,628 $ 940,341 $ 603,016 $ 1,213,066 $ 3,872,419 $ 3,497 $ 12,042,159 Special mention 402 55,314 92,315 9,462 23,220 10,695 149,012 268 340,688 Substandard accrual — 13,415 40,397 2,401 12,670 40,814 36,035 456 146,188 Substandard nonaccrual/doubtful — 550 5,479 10,985 28,490 2,215 231 — 47,950 Total commercial, industrial and other $ 752,521 $ 2,645,352 $ 2,219,819 $ 963,189 $ 667,396 $ 1,266,790 $ 4,057,697 $ 4,221 $ 12,576,985 Construction and development Pass $ 42,635 $ 506,714 $ 512,801 $ 204,113 $ 111,497 $ 119,478 $ 12,626 $ 369 $ 1,510,233 Special mention — — 1,475 16,480 23,494 14,360 — — 55,809 Substandard accrual — 2,337 — 8,301 — 14,969 — — 25,607 Substandard nonaccrual/doubtful — 4,190 798 — — 416 — — 5,404 Total construction and development $ 42,635 $ 513,241 $ 515,074 $ 228,894 $ 134,991 $ 149,223 $ 12,626 $ 369 $ 1,597,053 Non-construction Pass $ 472,528 $ 1,862,370 $ 1,441,054 $ 1,002,397 $ 814,910 $ 2,637,342 $ 184,246 $ 649 $ 8,415,496 Special mention — 4,351 11,872 2,140 29,868 74,174 1,439 — 123,844 Substandard accrual — — 3,163 22,041 16,827 54,862 — — 96,893 Substandard nonaccrual/doubtful — — — — — 5,792 — — 5,792 Total non-construction $ 472,528 $ 1,866,721 $ 1,456,089 $ 1,026,578 $ 861,605 $ 2,772,170 $ 185,685 $ 649 $ 8,642,025 Home equity Pass $ — $ — $ — $ — $ 56 $ 5,633 $ 317,387 $ — $ 323,076 Special mention — — — — — 1,430 2,193 — 3,623 Substandard accrual — — — — — 8,214 869 44 9,127 Substandard nonaccrual/doubtful — — 77 116 18 880 99 — 1,190 Total home equity $ — $ — $ 77 $ 116 $ 74 $ 16,157 $ 320,548 $ 44 $ 337,016 Residential real estate Early buy-out loans guaranteed by U.S. government agencies $ — $ — $ 769 $ 9,250 $ 19,430 $ 166,703 $ — $ — $ 196,152 Pass 95,403 815,003 825,881 225,297 118,840 196,150 — — 2,276,574 Special mention 40 3,816 718 1,992 542 4,488 — — 11,596 Substandard accrual 323 1,204 1,825 1,182 1,100 4,256 — — 9,890 Substandard nonaccrual/doubtful — 284 1,100 759 1,665 7,525 — — 11,333 Total residential real estate $ 95,766 $ 820,307 $ 830,293 $ 238,480 $ 141,577 $ 379,122 $ — $ — $ 2,505,545 Premium finance receivables - property and casualty Pass $ 2,826,947 $ 2,757,313 $ 35,647 $ 5,270 $ 906 $ — $ — $ — $ 5,626,083 Special mention 42,025 49,190 969 17 — — — — 92,201 Substandard accrual 205 1,700 148 — — — — — 2,053 Substandard nonaccrual/doubtful 777 16,975 779 12 — — — — 18,543 Total premium finance receivables - property and casualty $ 2,869,954 $ 2,825,178 $ 37,543 $ 5,299 $ 906 $ — $ — $ — $ 5,738,880 Premium finance receivables - life Pass $ 49,164 $ 550,396 $ 830,917 $ 1,056,414 $ 936,674 $ 4,699,645 $ — $ — $ 8,123,210 Special mention — — 1,156 1,436 — — — — 2,592 Substandard accrual — — — — — — — — — Substandard nonaccrual/doubtful — — — — — — — — — Total premium finance receivables - life $ 49,164 $ 550,396 $ 832,073 $ 1,057,850 $ 936,674 $ 4,699,645 $ — $ — $ 8,125,802 Consumer and other Pass $ 750 $ 2,469 $ 1,414 $ 200 $ 433 $ 5,306 $ 31,392 $ — $ 41,964 Special mention — 6 1 — 2 133 3 — 145 Substandard accrual — 2 — — — 40 8 — 50 Substandard nonaccrual/doubtful — — 6 — — — — — 6 Total consumer and other $ 750 $ 2,477 $ 1,421 $ 200 $ 435 $ 5,479 $ 31,403 $ — $ 42,165 Total loans Early buy-out loans guaranteed by U.S. government agencies $ — $ — $ 769 $ 9,250 $ 19,430 $ 166,703 $ — $ — $ 196,152 Pass 4,239,546 9,070,338 5,729,342 3,434,032 2,586,332 8,876,620 4,418,070 4,515 38,358,795 Special mention 42,467 112,677 108,506 31,527 77,126 105,280 152,647 268 630,498 Substandard accrual 528 18,658 45,533 33,925 30,597 123,155 36,912 500 289,808 Substandard nonaccrual/doubtful 777 21,999 8,239 11,872 30,173 16,828 330 — 90,218 Total loans $ 4,283,318 $ 9,223,672 $ 5,892,389 $ 3,520,606 $ 2,743,658 $ 9,288,586 $ 4,607,959 $ 5,283 $ 39,565,471 Current period gross write offs $ 478 $ 4,893 $ 1,194 $ 337 $ 318 $ 131 $ — $ — $ 7,351
Held-to-Maturity Debt Securities by Credit Quality Indicator	For purposes of the table below, the Company has converted any issuer rating from an NRSRO into the Company’s internal ratings based on Investment Policy and review by the Company’s management. As of March 31, 2023 Year of Origination Total (In thousands) 2023 2022 2021 2020 2019 Prior Balance Amortized Cost Balances: U.S. government agencies 1-4 internal grade $ — $ 160,000 $ 147,804 $ 25,000 $ 4,000 $ 2,804 $ 339,608 5-7 internal grade — 8-10 internal grade — Total U.S. government agencies $ — $ 160,000 $ 147,804 $ 25,000 $ 4,000 $ 2,804 $ 339,608 Municipal 1-4 internal grade $ — $ 1,042 $ 6,978 $ 264 $ 618 $ 165,818 $ 174,720 5-7 internal grade — — — — — — — 8-10 internal grade — — — — — — — Total municipal $ — $ 1,042 $ 6,978 $ 264 $ 618 $ 165,818 $ 174,720 Mortgage-backed securities 1-4 internal grade $ 5,065 $ 606,922 $ 2,422,478 $ — $ — $ — $ 3,034,465 5-7 internal grade — — — — — — — 8-10 internal grade — — — — — — — Total mortgage-backed securities $ 5,065 $ 606,922 $ 2,422,478 $ — $ — $ — $ 3,034,465 Corporate notes 1-4 internal grade $ — $ 14,964 $ — $ 6,009 $ 7,291 $ 29,797 $ 58,061 5-7 internal grade — — — — — — — 8-10 internal grade — — — — — — — Total corporate notes $ — $ 14,964 $ — $ 6,009 $ 7,291 $ 29,797 $ 58,061 Total held-to-maturity securities $ 3,606,854 Less: Allowance for credit losses (463) Held-to-maturity securities, net of allowance for credit losses $ 3,606,391
Schedule of Allowance for Credit Losses	As significant judgment is required, the review of the appropriateness of the allowance for credit losses is performed quarterly by various committees with participation by the Company's executive management. March 31, December 31, March 31, (In thousands) 2023 2022 2022 Allowance for loan losses $ 287,972 $ 270,173 $ 250,539 Allowance for unfunded lending-related commitments losses 87,826 87,275 50,629 Allowance for loan losses and unfunded lending-related commitments losses 375,798 357,448 301,168 Allowance for held-to-maturity securities losses 463 488 159 Allowance for credit losses $ 376,261 $ 357,936 $ 301,327
Summary of Activity in the Allowance for Credit Losses by Loan Portfolio	A summary of activity in the allowance for credit losses, specifically for the loan portfolio (i.e. allowance for loan losses and allowance for unfunded commitment losses), for the three and three months ended March 31, 2023 and 2022 is as follows. Three months ended March 31, 2023 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses at beginning of period $ 142,769 $ 184,352 $ 7,573 $ 11,585 $ 10,671 $ 498 $ 357,448 Cumulative effect adjustment from the adoption of ASU 2022-02 111 1,356 (33) (692) — (1) 741 Other adjustments — — — — 4 — 4 Charge-offs (2,543) (5) — — (4,650) (153) (7,351) Recoveries 392 100 35 4 1,323 32 1,886 Provision for credit losses 8,772 8,977 153 537 4,607 24 23,070 Allowance for credit losses at period end $ 149,501 $ 194,780 $ 7,728 $ 11,434 $ 11,955 $ 400 $ 375,798 By measurement method: Individually measured $ 11,281 $ 1,621 $ — $ — $ — $ 1 $ 12,903 Collectively measured 138,220 193,159 7,728 11,434 11,955 399 362,895 Loans at period end Individually measured $ 47,950 $ 11,196 $ 1,190 $ 11,280 $ — $ 6 $ 71,622 Collectively measured 12,529,035 10,227,882 335,826 2,286,733 13,864,682 42,159 39,286,317 Loans held at fair value — — — 207,532 — — 207,532 Three months ended March 31, 2022 Commercial Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Allowance for credit losses at beginning of period $ 119,307 $ 144,583 $ 10,699 $ 8,782 $ 15,859 $ 423 $ 299,653 Other adjustments — — — — 22 — 22 Charge-offs (1,414) (777) (197) (466) (1,678) (193) (4,725) Recoveries 538 32 93 5 1,476 49 2,193 Provision for credit losses 2,480 1,068 (29) 1,108 (957) 355 4,025 Allowance for credit losses at period end $ 120,911 $ 144,906 $ 10,566 $ 9,429 $ 14,722 $ 634 $ 301,168 By measurement method: Individually measured $ 3,698 $ 522 $ 127 $ 800 $ — $ 5 $ 5,152 Collectively measured 117,213 144,384 10,439 8,629 14,722 629 296,016 Loans at period end Individually measured $ 19,651 $ 22,370 $ 12,904 $ 17,842 $ — $ 79 $ 72,846 Collectively measured 11,564,312 9,212,704 308,531 1,724,159 12,291,571 48,440 35,149,717 Loans held at fair value — — — 57,984 — — 57,984
Summary of the Post-Modification Balance of Loans Experiencing Financial Difficulties	The table below presents a summary of the balance immediately following the modification of loans to borrowers experiencing financial difficulties during the three months ended March 31, 2023: Three months ended March 31, 2023 (Dollars in thousands) Total (1) Percentage of Total Class of Loan Extension of Term (1) Reduction of Interest Rate (1) Delay in Contractual Payments (1) Extension of Term and Reduction of Interest Rate (1) Commercial Commercial, industrial and other $ 37,474 0.3 % $ 1,938 $ 221 $ 35,265 $ 50 Commercial real estate Non-construction 1,333 — 467 827 39 — Home equity 203 0.1 203 — — — Residential real estate 1,708 0.1 1,253 271 — 184 Premium finance receivables Property and casualty insurance loans 11 0.0 3 — — 8 Total loans $ 40,729 0.1 % $ 3,864 $ 1,319 $ 35,304 $ 242 Weighted average magnitude of modifications: Duration of extension and delayed payment terms 27 months 17 months Reduction of interest rate 275 bps (1) Balances represent the recorded investment in the loan at the time of the restructuring.
Summary of Loans for Borrowers Experiencing Financial Difficulties Modified	The following table presents a summary of all loans for borrowers experiencing financial difficulties modified during the three months ended March 31, 2023, and such loans that were in payment default under the restructured terms during the respective periods below: (Dollars in thousands) As of March 31, 2023 Three Months Ended March 31, 2023 Total (2) Payments in Default (1)(2) Commercial Commercial, industrial and other $ 37,474 $ 2 Commercial real estate Non-construction 1,333 828 Home equity 203 104 Residential real estate 1,708 — Premium finance receivables Property and casualty insurance loans 11 11 Total loans $ 40,729 $ 945 (1) Modified loans considered to be in payment default are over 30 days past due subsequent to the restructuring. (2) Balances represent the recorded investment in the loan at the time of the restructuring.
Summary of the Post-Modification Balance of Loans Restructured	The table below presents a summary of the balance immediately following the modification of loans restructured during the three months ended March 31, 2022 which represent TDRs: Three months ended March 31, 2022 (Dollars in thousands) Total (1)(2) Extension at Below Market Terms (2) Reduction of Interest Rate (2) Modification to Interest-only Payments (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 3 $ 282 2 $ 120 1 $ 85 2 $ 247 — $ — Commercial real estate Non-construction 2 1,907 1 1,178 1 1,178 2 1,907 — — Residential real estate and other 8 908 8 908 7 762 — — — — Total loans 13 $ 3,097 11 $ 2,206 9 $ 2,025 4 $ 2,154 — $ — (1) TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above. (2) Balances represent the recorded investment in the loan at the time of the restructuring. The following table presents a summary of all loans restructured in TDRs during the twelve months ended March 31, 2022 and such loans that were in payment default under the restructured terms during the respective periods below: (Dollars in thousands) As of March 31, 2022 Three Months Ended March 31, 2022 Total (1)(3) Payments in Default (2)(3) Count Balance Count Balance Commercial Commercial, industrial and other 17 $ 5,205 11 $ 4,526 Commercial real estate Non-construction 5 4,613 2 2,163 Residential real estate and other 35 5,021 1 104 Total loans 57 $ 14,839 14 $ 6,793 (1) Total TDRs represent all loans restructured om TDRs during the previous twelve months from the date indicated. (2) TDRs considered to be in payment default are over 30 days past due subsequent to the restructuring. (3) Balances represent the recorded investment in the loan at the time of the restructuring.

Goodwill and Other Acquisitio_2

Goodwill and Other Acquisition-Related Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill Assets by Business Segment	A summary of the Company’s goodwill assets by reporting unit is presented in the following table: (In thousands) December 31, 2022 Goodwill Impairment Goodwill Adjustments March 31, Community banking $ 545,671 $ — $ — $ — $ 545,671 Specialty finance 38,480 — — 63 38,543 Wealth management 69,373 — — — 69,373 Total $ 653,524 $ — $ — $ 63 $ 653,587
Summary of Infinite-Lived Intangible Assets	A summary of acquisition-related intangible assets as of the dates shown and the expected amortization of finite-lived acquisition-related intangible assets as of March 31, 2023 is as follows: (In thousands) March 31, December 31, March 31, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,206 $ 55,206 $ 55,206 Accumulated amortization (43,473) (42,501) (39,243) Net carrying amount $ 11,733 $ 12,705 $ 15,963 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 17,533 $ 18,505 $ 21,763 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,962 $ 1,962 $ 1,968 Accumulated amortization (1,799) (1,785) (1,738) Net carrying amount $ 163 $ 177 $ 230 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 20,430 Accumulated amortization (17,175) (16,926) (15,724) Net carrying amount $ 3,255 $ 3,504 $ 4,706 Total acquisition-related intangible assets: Gross carrying amount $ 83,398 $ 83,398 $ 83,404 Accumulated amortization (62,447) (61,212) (56,705) Total other acquisition-related intangible assets, net $ 20,951 $ 22,186 $ 26,699
Summary of Finite-Lived Intangible Assets	A summary of acquisition-related intangible assets as of the dates shown and the expected amortization of finite-lived acquisition-related intangible assets as of March 31, 2023 is as follows: (In thousands) March 31, December 31, March 31, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,206 $ 55,206 $ 55,206 Accumulated amortization (43,473) (42,501) (39,243) Net carrying amount $ 11,733 $ 12,705 $ 15,963 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 17,533 $ 18,505 $ 21,763 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,962 $ 1,962 $ 1,968 Accumulated amortization (1,799) (1,785) (1,738) Net carrying amount $ 163 $ 177 $ 230 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 20,430 Accumulated amortization (17,175) (16,926) (15,724) Net carrying amount $ 3,255 $ 3,504 $ 4,706 Total acquisition-related intangible assets: Gross carrying amount $ 83,398 $ 83,398 $ 83,404 Accumulated amortization (62,447) (61,212) (56,705) Total other acquisition-related intangible assets, net $ 20,951 $ 22,186 $ 26,699
Estimated Amortization	Estimated amortization Actual in three months ended March 31, 2023 $ 1,235 Estimated remaining in 2023 3,422 Estimated—2024 3,259 Estimated—2025 2,552 Estimated—2026 1,954 Estimated—2027 1,450

Mortgage Servicing Rights ("M_2

Mortgage Servicing Rights ("MSRs") (Tables)	3 Months Ended
	Mar. 31, 2023
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Schedule of Servicing Assets at Fair Value	The following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the periods indicated: Three Months Ended March 31, March 31, (In thousands) 2023 2022 Fair value at beginning of the period $ 230,225 $ 147,571 Additions from loans sold with servicing retained 5,107 14,401 Estimate of changes in fair value due to: Early buyout options (“EBO”) exercised — (175) Payoffs and paydowns (3,909) (6,016) Changes in valuation inputs or assumptions (6,953) 43,365 Fair value at end of the period $ 224,470 $ 199,146 Unpaid principal balance of mortgage loans serviced for others $ 14,080,461 $ 13,426,535

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2023
Deposits [Abstract]
Summary of Deposits	The following table is a summary of deposits as of the dates shown: (Dollars in thousands) March 31, December 31, March 31, Balance: Non-interest-bearing $ 11,236,083 $ 12,668,160 $ 13,748,918 NOW and interest-bearing demand deposits 5,576,558 5,591,986 5,089,724 Wealth management deposits 1,809,933 2,463,833 2,542,995 Money market 13,552,277 12,886,795 13,012,460 Savings 5,192,108 4,556,635 4,089,230 Time certificates of deposit 5,351,252 4,735,135 3,735,995 Total deposits $ 42,718,211 $ 42,902,544 $ 42,219,322 Mix: Non-interest-bearing 26 % 30 % 32 % NOW and interest-bearing demand deposits 13 13 12 Wealth management deposits 4 5 6 Money market 32 30 31 Savings 12 11 10 Time certificates of deposit 13 11 9 Total deposits 100 % 100 % 100 %

FHLB Advances, Other Borrowin_2

FHLB Advances, Other Borrowings and Subordinated Notes (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Summary of Debt	The following table is a summary of FHLB advances, other borrowings and subordinated notes as of the dates shown: (In thousands) March 31, December 31, March 31, FHLB advances $ 2,316,071 $ 2,316,071 $ 1,241,071 Other borrowings: Notes payable 192,666 199,793 74,969 Short-term borrowings 10,124 17,612 15,872 Secured borrowings 320,007 317,942 328,889 Other 60,751 61,267 62,786 Total other borrowings 583,548 596,614 482,516 Subordinated notes 437,493 437,392 437,033 Total FHLB advances, other borrowings and subordinated notes $ 3,337,112 $ 3,350,077 $ 2,160,620
Schedule of Financial Instruments Owned and Pledged as Collateral	The following is a summary of these securities pledged as of March 31, 2023 disaggregated by investment category and maturity of the related customer sweep account, and reconciled to the outstanding balance of securities sold under repurchase agreements: (In thousands) Overnight Sweep Collateral Available-for-sale securities pledged Mortgage-backed securities $ 18,348 Excess collateral 8,224 Securities sold under repurchase agreements $ 10,124

Junior Subordinated Debentures

Junior Subordinated Debentures (Tables)	3 Months Ended
	Mar. 31, 2023
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Summary of Junior Subordinated Debentures	The following table provides a summary of the Company’s junior subordinated debentures as of March 31, 2023. The junior subordinated debentures represent the par value of the obligations owed to the Trusts. (Dollars in thousands) Common Trust Junior Rate Contractual Rate at 3/31/2023 Issue Maturity Earliest Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 L+3.25 8.08 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 L+2.80 7.96 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 L+2.60 7.76 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 L+1.95 6.82 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 L+1.45 6.61 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 L+1.63 6.50 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 L+3.00 7.81 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 L+3.00 7.81 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 L+3.00 8.16 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 L+1.75 6.62 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 L+1.62 6.49 % 06/2007 09/2037 06/2012 Total $ 253,566 7.16 %

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Summary of Segment Information	The following is a summary of certain operating information for reportable segments: Three Months Ended $ Change in % Change in (Dollars in thousands) March 31, March 31, Net interest income: Community Banking $ 369,848 $ 228,615 $ 141,233 62 % Specialty Finance 70,351 55,370 14,981 27 Wealth Management 8,955 8,376 579 7 Total Operating Segments 449,154 292,361 156,793 54 Intersegment Eliminations 8,841 6,933 1,908 28 Consolidated net interest income $ 457,995 $ 299,294 $ 158,701 53 % Provision for credit losses: Community Banking $ 21,099 $ 4,118 $ 16,981 NM Specialty Finance 1,946 (12) 1,958 NM Wealth Management — — — — Total Operating Segments 23,045 4,106 18,939 NM Intersegment Eliminations — — — — Consolidated provision for credit losses $ 23,045 $ 4,106 $ 18,939 NM Non-interest income: Community Banking $ 68,733 $ 121,888 $ (53,155) (44) % Specialty Finance 25,790 24,122 1,668 7 Wealth Management 30,297 30,578 (281) (1) Total Operating Segments 124,820 176,588 (51,768) (29) Intersegment Eliminations (17,051) (13,798) (3,253) 24 Consolidated non-interest income $ 107,769 $ 162,790 $ (55,021) (34) % Net revenue: Community Banking $ 438,581 $ 350,503 $ 88,078 25 % Specialty Finance 96,141 79,492 16,649 21 Wealth Management 39,252 38,954 298 1 Total Operating Segments 573,974 468,949 105,025 22 Intersegment Eliminations (8,210) (6,865) (1,345) 20 Consolidated net revenue $ 565,764 $ 462,084 $ 103,680 22 % Segment profit: Community Banking $ 134,232 $ 90,099 $ 44,133 49 % Specialty Finance 36,737 29,604 7,133 24 Wealth Management 9,229 7,688 1,541 20 Consolidated net income $ 180,198 $ 127,391 $ 52,807 41 % Segment assets: Community Banking $ 41,611,980 $ 40,050,015 $ 1,561,965 4 % Specialty Finance 9,841,044 8,624,501 1,216,543 14 Wealth Management 1,420,487 1,576,145 (155,658) (10) Consolidated total assets $ 52,873,511 $ 50,250,661 $ 2,622,850 5 % NM - Not meaningful

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Fair Value Of Derivative Financial Instruments	The table below presents the fair value of the Company’s derivative financial instruments as of March 31, 2023, December 31, 2022 and March 31, 2022: Derivative Assets Derivative Liabilities (In thousands) March 31, December 31, March 31, March 31, December 31, March 31, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ 25,730 $ — $ 13,257 $ 43,412 $ 58,198 $ 3,361 Interest rate derivatives designated as Fair Value Hedges 13,732 16,768 7,388 — — 1,716 Total derivatives designated as hedging instruments under ASC 815 $ 39,462 $ 16,768 $ 20,645 $ 43,412 $ 58,198 $ 5,077 Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 219,869 $ 269,670 $ 119,056 $ 219,053 $ 271,109 $ 115,002 Interest rate lock commitments 5,356 1,711 3,447 67 58 1,558 Forward commitments to sell mortgage loans 121 220 10,063 2,953 414 147 Commodity forward contracts 491 257 — 315 162 — Foreign exchange contracts 8,705 8,222 323 8,632 8,137 323 Total derivatives not designated as hedging instruments under ASC 815 $ 234,542 $ 280,080 $ 132,889 $ 231,020 $ 279,880 $ 117,030 Total Derivatives $ 274,004 $ 296,848 $ 153,534 $ 274,432 $ 338,078 $ 122,107
Schedule Of Cash Flow Hedging Instruments	The table below provides details on these cash flow hedges, summarized by derivative type and maturity, as of March 31, 2023: March 31, 2023 Notional Fair Value (In thousands) Amount Asset (Liability) Interest Rate Collars at 1-month CME term SOFR: Buy 2.250% floor, sell 3.743% cap; matures September 2025 $ 1,250,000 $ (16,675) Buy 2.750% floor, sell 4.320% cap; matures October 2026 500,000 (126) Buy 2.000% floor, sell 3.450% cap; matures September 2027 1,250,000 (26,069) Interest Rate Swaps at 1-month CME term SOFR: Fixed 3.748%; matures December 2025 250,000 26 Fixed 3.759%; matures December 2025 250,000 99 Fixed 3.680%; matures February 2026 250,000 (251) Fixed 4.176%; matures March 2026 250,000 3,342 Fixed 3.915%; matures March 2026 250,000 1,531 Fixed 4.450%; matures July 2026 250,000 6,502 Fixed 3.515%, matures December 2026 250,000 123 Fixed 3.512%; matures December 2026 250,000 97 Fixed 3.453%; matures February 2027 250,000 (291) Fixed 4.150%; matures July 2027 250,000 7,238 Fixed 3.748%; matures March 2028 250,000 4,649 Fixed 3.526%; matures March 2028 250,000 2,123 Total Cash Flow Hedges $ 6,000,000 $ (17,682)
Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges	A rollforward of the amounts in accumulated other comprehensive income or loss related to interest rate derivatives designated as cash flow hedges, including such derivative contracts terminated during the period, follows: Three Months Ended (In thousands) March 31, March 31, Unrealized gain at beginning of period $ 10,026 $ 36,908 Amount reclassified from accumulated other comprehensive income or loss to interest income or expense on deposits, loans, and other borrowings 3,572 5,353 Amount of gain recognized in other comprehensive income or loss 31,094 34,128 Unrealized gain at end of period $ 44,692 $ 76,389
Schedule of Carrying Amount of Hedged Assets/(Liabilities)	The following table presents the carrying amount of the hedged assets/(liabilities) and the cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) that are designated as a fair value hedge accounting relationship as of March 31, 2023: March 31, 2023 (In thousands) Derivatives in Fair Value Hedging Relationships Location in the Statement of Condition Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued Interest rate swaps Loans, net of unearned income $ 138,254 $ (13,682) $ (100) Available-for-sale debt securities 898 (15) — The following table presents the loss or gain recognized related to derivative instruments that are designated as fair value hedges for the respective period: (In thousands) Derivatives in Fair Value Hedging Relationships Location of (Loss)/Gain Recognized Three Months Ended March 31, 2023 Interest rate swaps Interest and fees on loans $ (9) Interest income - investment securities —
Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives	Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows: (In thousands) Three Months Ended Derivative Location in income statement March 31, March 31, Interest rate swaps and caps Trading gains, net $ 800 $ 4,024 Mortgage banking derivatives Mortgage banking revenue 3,640 (7,369) Commodity contracts Trading gains (losses), net 177 — Foreign exchange contracts Trading gains, net — — Covered call options Fees from covered call options 10,391 3,742 Derivative contract held as economic hedge on MSRs Mortgage banking revenue 946 —
Offsetting Assets	The table below summarizes the Company’s interest rate derivatives and offsetting positions as of the dates shown. Derivative Assets Derivative Liabilities Fair Value Fair Value (In thousands) March 31, December 31, March 31, March 31, December 31, March 31, Gross Amounts Recognized $ 259,331 $ 286,438 $ 139,701 $ 262,465 $ 329,307 $ 120,079 Less: Amounts offset in the Statements of Condition — — — — — — Net amount presented in the Statements of Condition $ 259,331 $ 286,438 $ 139,701 $ 262,465 $ 329,307 $ 120,079 Gross amounts not offset in the Statements of Condition Offsetting Derivative Positions (55,838) (64,100) (19,557) (55,838) (64,100) (19,557) Collateral Posted (181,884) (194,666) (70,807) — — (257) Net Credit Exposure $ 21,609 $ 27,672 $ 49,337 $ 206,627 $ 265,207 $ 100,265
Offsetting Liabilities	The table below summarizes the Company’s interest rate derivatives and offsetting positions as of the dates shown. Derivative Assets Derivative Liabilities Fair Value Fair Value (In thousands) March 31, December 31, March 31, March 31, December 31, March 31, Gross Amounts Recognized $ 259,331 $ 286,438 $ 139,701 $ 262,465 $ 329,307 $ 120,079 Less: Amounts offset in the Statements of Condition — — — — — — Net amount presented in the Statements of Condition $ 259,331 $ 286,438 $ 139,701 $ 262,465 $ 329,307 $ 120,079 Gross amounts not offset in the Statements of Condition Offsetting Derivative Positions (55,838) (64,100) (19,557) (55,838) (64,100) (19,557) Collateral Posted (181,884) (194,666) (70,807) — — (257) Net Credit Exposure $ 21,609 $ 27,672 $ 49,337 $ 206,627 $ 265,207 $ 100,265

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Summary Of Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented: March 31, 2023 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 4,948 $ 4,948 $ — $ — U.S. government agencies 74,862 — 74,862 — Municipal 160,386 — 48,129 112,257 Corporate notes 83,675 — 83,675 — Mortgage-backed 2,935,974 — 2,935,974 — Trading account securities 102 — 102 — Equity securities with readily determinable fair value 111,943 103,877 8,066 — Mortgage loans held-for-sale 302,493 — 258,243 44,250 Loans held-for-investment 202,143 — 132,650 69,493 MSRs 224,470 — — 224,470 Nonqualified deferred compensation assets 14,379 — 14,379 — Derivative assets 274,004 — 268,648 5,356 Total $ 4,389,379 $ 108,825 $ 3,824,728 $ 455,826 Derivative liabilities $ 274,432 $ — $ 274,432 $ — December 31, 2022 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 14,948 $ 14,948 $ — $ — U.S. government agencies 74,222 — 74,222 — Municipal 168,655 — 51,118 117,537 Corporate notes 85,705 — 85,705 — Mortgage-backed 2,899,487 — 2,899,487 — Trading account securities 1,127 — 1,127 — Equity securities with readily determinable fair value 110,365 102,299 8,066 — Mortgage loans held-for-sale 299,935 — 251,280 48,655 Loans held-for-investment 179,932 — 95,767 84,165 MSRs 230,225 — — 230,225 Nonqualified deferred compensation assets 13,899 — 13,899 — Derivative assets 296,848 — 295,137 1,711 Total $ 4,375,348 $ 117,247 $ 3,775,808 $ 482,293 Derivative liabilities $ 338,078 $ — $ 338,078 $ — March 31, 2022 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 49,637 — 49,637 — Municipal 155,489 — 55,088 100,401 Corporate notes 82,939 — 82,939 — Mortgage-backed 2,710,833 — 2,710,833 — Trading account securities 852 — 852 — Equity securities with readily determinable fair value 92,689 84,623 8,066 — Mortgage loans held-for-sale 606,545 — 606,545 — Loans held-for-investment 57,984 — 13,520 44,464 MSRs 199,146 — — 199,146 Nonqualified deferred compensation assets 15,447 — 15,447 — Derivative assets 153,534 — 150,087 3,447 Total $ 4,125,095 $ 84,623 $ 3,693,014 $ 347,458 Derivative liabilities $ 122,107 $ — $ 122,107 $ —
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis during the three months ended March 31, 2023 and 2022 are summarized as follows: Mortgage loans held-for-sale U.S. Government agencies Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at January 1, 2023 $ 117,537 $ 48,655 $ — $ 84,165 $ 230,225 $ 1,711 Total net (losses) gains included in: Net income (1) — 466 — 364 (5,755) 3,645 Other comprehensive income or loss (1,662) — — — — — Purchases 4,418 — — — — — Issuances — — — — — — Sales — — — — — — Settlements (8,036) (18,619) — (20,322) — — Net transfers into Level 3 — 13,748 — 5,286 — — Balance at March 31, 2023 $ 112,257 $ 44,250 $ — $ 69,493 $ 224,470 $ 5,356 (1) Changes in the balance of mortgage loans held-for-sale, MSRs, and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. Mortgage loans held-for-sale U.S. Government agencies Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at January 1, 2022 $ 105,687 $ — $ — $ 15,891 $ 147,571 $ 10,560 Total net gains (losses) included in: Net income (1) — — — (772) 51,575 (7,113) Other comprehensive income or loss (5,449) — — — — — Purchases 1,246 — — — — — Issuances — — — — — — Sales — — — — — — Settlements (1,083) — — (1,667) — — Net transfers into Level 3 — — — 31,012 — — Balance at March 31, 2022 $ 100,401 $ — $ — $ 44,464 $ 199,146 $ 3,447
Summary Of Assets Measured At Fair Value On A Nonrecurring Basis	For assets measured at fair value on a non-recurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at March 31, 2023: March 31, 2023 Three Months Ended March 31, 2023 Fair Value Losses Recognized, net (In thousands) Total Level 1 Level 2 Level 3 Individually assessed loans - foreclosure probable and collateral-dependent $ 71,622 $ — $ — $ 71,622 $ 2,501 Other real estate owned (1) 9,361 — — 9,361 104 Total $ 80,983 $ — $ — $ 80,983 $ 2,605 (1) Fair value losses recognized, net on other real estate owned include valuation adjustments and charge-offs during the respective period.
Schedule Of Valuation Techniques And Significant Unobservable Inputs Used To Measure Both Recurring And NonRecurring	The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at March 31, 2023 were as follows: (Dollars in thousands) Fair Value Valuation Methodology Significant Unobservable Input Range Weighted Impact to valuation Measured at fair value on a recurring basis: Municipal securities $ 112,257 Bond pricing Equivalent rating BBB-AA+ N/A Increase Mortgage loans held-for-sale 44,250 Discounted cash flows Discount rate 5.96% 5.96% Decrease Credit discount 0% - 10% 0.22% Decrease Loans held-for-investment 69,493 Discounted cash flows Discount rate 5.96% - 6.25% 5.98% Decrease Credit discount 0% - 13% 0.86% Decrease Constant prepayment rate (CPR) - current loans 6.92% 6.92% Decrease Average life - delinquent loans (in years) 1.2 years - 10.2 years 5.4 years Decrease MSRs 224,470 Discounted cash flows Discount rate 3% - 33% 10.33% Decrease Constant prepayment rate (CPR) 0% - 100% 6.92% Decrease Cost of servicing $70 - $200 $ 76 Decrease Cost of servicing - delinquent $200 - 1,000 $ 403 Decrease Derivatives 5,356 Discounted cash flows Pull-through rate 31% - 100% 82.06 % Increase Measured at fair value on a non-recurring basis: Individually assessed loans - foreclosure probable and collateral-dependent 71,622 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 9,361 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease
Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments	The table below presents the carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown: At March 31, 2023 At December 31, 2022 At March 31, 2022 Carrying Fair Carrying Fair Carrying Fair (In thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 445,986 $ 445,986 $ 490,966 $ 490,966 $ 462,572 $ 462,572 Securities sold under agreements to repurchase with original maturities exceeding three months — — — — 700,000 700,000 Interest-bearing deposits with banks 1,563,578 1,563,578 1,988,719 1,988,719 4,013,597 4,013,597 Available-for-sale securities 3,259,845 3,259,845 3,243,017 3,243,017 2,998,898 2,998,898 Held-to-maturity securities 3,606,391 2,976,198 3,640,567 2,949,821 3,435,729 3,146,427 Trading account securities 102 102 1,127 1,127 852 852 Equity securities with readily determinable fair value 111,943 111,943 110,365 110,365 92,689 92,689 FHLB and FRB stock, at cost 244,957 244,957 224,759 224,759 136,163 136,163 Brokerage customer receivables 16,042 16,042 16,387 16,387 22,888 22,888 Mortgage loans held-for-sale, at fair value 302,493 302,493 299,935 299,935 606,545 606,545 Loans held-for-investment, at fair value 202,143 202,143 179,932 179,932 57,984 57,984 Loans held-for-investment, at amortized cost 39,363,328 38,577,761 39,016,553 38,018,678 35,222,563 35,989,840 Nonqualified deferred compensation assets 14,379 14,379 13,899 13,899 15,447 15,447 Derivative assets 274,004 274,004 296,848 296,848 153,534 153,534 Accrued interest receivable and other 417,066 417,066 379,719 379,719 278,873 278,873 Total financial assets $ 49,822,257 $ 48,406,497 $ 49,902,793 $ 48,214,172 $ 48,198,334 $ 48,676,309 Financial Liabilities Non-maturity deposits $ 37,366,959 $ 37,366,959 $ 38,167,409 $ 38,167,409 $ 38,483,327 $ 38,483,327 Deposits with stated maturities 5,351,252 4,970,556 4,735,135 4,085,058 3,735,995 3,735,750 FHLB advances 2,316,071 2,255,580 2,316,071 2,219,983 1,241,071 1,193,080 Other borrowings 583,548 555,615 596,614 569,342 482,516 483,202 Subordinated notes 437,493 410,827 437,392 409,395 437,033 446,711 Junior subordinated debentures 253,566 252,663 253,566 253,405 253,566 268,913 Derivative liabilities 274,432 274,432 338,078 338,078 122,107 122,107 Accrued interest payable 42,015 42,015 22,176 22,176 14,269 14,269 Total financial liabilities $ 46,625,336 $ 46,128,647 $ 46,866,441 $ 46,064,846 $ 44,769,884 $ 44,747,359

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Summary Of Stock Option Activity	A summary of the Plans’ stock option activity for the three months ended March 31, 2023 and March 31, 2022 is presented below: Stock Options Common Weighted Remaining Contractual Term (1) Intrinsic Value (2) (in thousands) Outstanding at January 1, 2023 68,093 $ 41.14 Granted — — Exercised (54,218) 40.87 Forfeited or canceled — — Outstanding at March 31, 2023 13,875 $ 42.18 4.7 $ 427 Exercisable at March 31, 2023 13,875 $ 42.18 4.7 $ 427 Stock Options Common Weighted Remaining Contractual Term (1) Intrinsic Value (2) (in thousands) Outstanding at January 1, 2022 193,447 $ 41.62 Granted — — Exercised (79,376) 42.32 Forfeited or canceled (771) 40.87 Outstanding at March 31, 2022 113,300 $ 41.13 1.4 $ 5,869 Exercisable at March 31, 2022 113,300 $ 41.13 1.4 $ 5,869 (1) Represents the remaining weighted average contractual life in years. (2) Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company’s stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock.
Summary of Plans' Restricted and Performance Share Award Activity	A summary of the Plans’ restricted share activity for the three months ended March 31, 2023 and March 31, 2022 is presented below: Three months ended March 31, 2023 Three months ended March 31, 2022 Restricted Shares Common Weighted Common Weighted Outstanding at January 1 610,155 $ 73.21 476,813 $ 61.33 Granted 242,576 89.82 194,849 97.30 Vested and issued (96,649) 64.14 (52,465) 65.42 Forfeited or canceled (1,968) 77.37 (3,615) 66.37 Outstanding at March 31 754,114 $ 79.70 615,582 $ 72.34 Vested, but deferred, at March 31 97,888 $ 53.30 95,806 $ 52.67 A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the three months ended March 31, 2023 and March 31, 2022 is presented below: Three months ended March 31, 2023 Three months ended March 31, 2022 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 545,379 $ 70.30 557,255 $ 62.94 Granted 185,514 92.48 159,202 97.21 Added by performance factor at vesting 23,161 63.64 — — Vested and issued (178,203) 63.64 — — Forfeited or canceled (2,301) 78.20 (159,952) 71.56 Outstanding at March 31 573,550 $ 79.24 556,505 $ 70.27 Vested, but deferred, at March 31 35,852 $ 44.59 35,285 $ 43.88

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Components Of Other Comprehensive Income or Loss	The following tables summarize the components of other comprehensive income or loss, including the related income tax effects, and the related amount reclassified to net income for the periods presented: (In thousands) Accumulated Accumulated Accumulated Total Balance at January 1, 2023 $ (386,057) $ 7,381 $ (48,960) $ (427,636) Other comprehensive income during the period, net of tax, before reclassifications 34,503 22,808 710 58,021 Amount reclassified from accumulated other comprehensive loss into net income, net of tax (409) 2,620 — 2,211 Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax (32) — — (32) Net other comprehensive income during the period, net of tax $ 34,062 $ 25,428 $ 710 $ 60,200 Balance at March 31, 2023 $ (351,995) $ 32,809 $ (48,250) $ (367,436) Balance at January 1, 2022 $ 8,724 $ 27,111 $ (31,743) $ 4,092 Other comprehensive (loss) income during the period, net of tax, before reclassifications (151,114) 25,023 2,288 (123,803) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (183) 3,926 — 3,743 Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax (31) — — (31) Net other comprehensive (loss) income during the period, net of tax $ (151,328) $ 28,949 $ 2,288 $ (120,091) Balance at March 31, 2022 $ (142,604) $ 56,060 $ (29,455) $ (115,999)
Other Comprehensive Income Reclassified from AOCI	(In thousands) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Details Regarding the Component of Accumulated Other Comprehensive Income (Loss) Three Months Ended Impacted Line on the March 31, 2023 2022 Accumulated unrealized gains on securities Gains included in net income $ 560 $ 250 Gains (losses) on investment securities, net 560 250 Income before taxes Tax effect (151) (67) Income tax expense Net of tax $ 409 $ 183 Net income Accumulated unrealized gains on derivative instruments Amount reclassified to interest income on loans $ 9,072 $ — Interest on Loans Amount reclassified to interest expense on deposits $ (5,588) $ 4,819 Interest on deposits Amount reclassified to interest expense on other borrowings 88 534 Interest on other borrowings (3,572) (5,353) Income before taxes Tax effect 952 1,427 Income tax expense Net of tax $ (2,620) $ (3,926) Net income
Computation Of Basic And Diluted Earnings Per Common Share	The following table shows the computation of basic and diluted earnings per share for the periods indicated: Three Months Ended (In thousands, except per share data) March 31, March 31, Net income $ 180,198 $ 127,391 Less: Preferred stock dividends 6,991 6,991 Net income applicable to common shares (A) $ 173,207 $ 120,400 Weighted average common shares outstanding (B) 60,950 57,196 Effect of dilutive potential common shares Common stock equivalents 873 862 Weighted average common shares and effect of dilutive potential common shares (C) 61,823 58,058 Net income per common share: Basic (A/B) $ 2.84 $ 2.11 Diluted (A/C) $ 2.80 $ 2.07

Recent Accounting Development_2

Recent Accounting Developments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss adjustment	$ 375,798		$ 357,448	$ 301,168	$ 299,653
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss adjustment			$ 741
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss adjustment		$ 741

Investment Securities (Schedule

Investment Securities (Schedule of Investment Securities) (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Available-for-sale securities
Amortized Cost	$ 3,739,980,000	$ 3,769,634,000	$ 3,193,741,000
Gross Unrealized Gains	2,227,000	511,000	1,978,000
Gross Unrealized Losses	(482,362,000)	(527,128,000)	(196,821,000)
Fair Value	3,259,845,000	3,243,017,000	2,998,898,000
Held-to-maturity securities
Amortized Cost	3,606,854,000	3,641,055,000	3,435,888,000
Gross Unrealized Gains	2,352,000	477,000	3,211,000
Gross Unrealized Losses	(633,008,000)	(691,711,000)	(292,672,000)
Fair Value	2,976,198,000	2,949,821,000	3,146,427,000
Less: Allowance for credit losses	(463,000)	(488,000)	(159,000)
Held-to-maturity securities, net of allowance for credit losses	3,606,391,000	3,640,567,000	3,435,729,000
Equity securities with readily determinable fair value
Amortized Cost	116,296,000	115,552,000	91,629,000
Gross Unrealized Gains	3,065,000	2,935,000	5,259,000
Gross Unrealized Losses	(7,418,000)	(8,122,000)	(4,199,000)
Fair Value	111,943,000	110,365,000	92,689,000
U.S. Treasury
Available-for-sale securities
Amortized Cost	4,947,000	14,943,000	0
Gross Unrealized Gains	1,000	5,000	0
Gross Unrealized Losses	0	0	0
Fair Value	4,948,000	14,948,000	0
U.S. government agencies
Available-for-sale securities
Amortized Cost	80,000,000	80,000,000	50,000,000
Gross Unrealized Gains	0	36,000	366,000
Gross Unrealized Losses	(5,138,000)	(5,814,000)	(729,000)
Fair Value	74,862,000	74,222,000	49,637,000
Held-to-maturity securities
Amortized Cost	339,608,000	339,614,000	264,661,000
Gross Unrealized Gains	24,000	0	35,000
Gross Unrealized Losses	(70,064,000)	(75,293,000)	(27,673,000)
Fair Value	269,568,000	264,321,000	237,023,000
Municipal
Available-for-sale securities
Amortized Cost	164,110,000	173,861,000	157,563,000
Gross Unrealized Gains	439,000	230,000	1,019,000
Gross Unrealized Losses	(4,163,000)	(5,436,000)	(3,093,000)
Fair Value	160,386,000	168,655,000	155,489,000
Held-to-maturity securities
Amortized Cost	174,720,000	179,027,000	180,548,000
Gross Unrealized Gains	1,117,000	477,000	3,176,000
Gross Unrealized Losses	(2,880,000)	(4,066,000)	(1,693,000)
Fair Value	172,957,000	175,438,000	182,031,000
Corporate notes
Held-to-maturity securities
Amortized Cost	58,061,000	58,232,000	43,784,000
Gross Unrealized Gains	14,000	0	0
Gross Unrealized Losses	(4,218,000)	(5,348,000)	(3,205,000)
Fair Value	53,857,000	52,884,000	40,579,000
Financial issuers
Available-for-sale securities
Amortized Cost	93,995,000	93,994,000	86,994,000
Gross Unrealized Gains	0	0	1,000
Gross Unrealized Losses	(11,320,000)	(9,291,000)	(5,047,000)
Fair Value	82,675,000	84,703,000	81,948,000
Other
Available-for-sale securities
Amortized Cost	1,000,000	1,000,000	1,000,000
Gross Unrealized Gains	0	2,000	0
Gross Unrealized Losses	0	0	(9,000)
Fair Value	1,000,000	1,002,000	991,000
Mortgage-backed securities
Available-for-sale securities
Amortized Cost	3,300,048,000	3,308,494,000	2,794,760,000
Gross Unrealized Gains	1,787,000	238,000	591,000
Gross Unrealized Losses	(445,405,000)	(488,795,000)	(177,899,000)
Fair Value	2,856,430,000	2,819,937,000	2,617,452,000
Held-to-maturity securities
Amortized Cost	2,872,591,000	2,900,031,000	2,772,622,000
Gross Unrealized Gains	1,197,000	0	0
Gross Unrealized Losses	(533,415,000)	(583,682,000)	(253,254,000)
Fair Value	2,340,373,000	2,316,349,000	2,519,368,000
Collateralized mortgage obligations
Available-for-sale securities
Amortized Cost	95,880,000	97,342,000	103,424,000
Gross Unrealized Gains	0	0	1,000
Gross Unrealized Losses	(16,336,000)	(17,792,000)	(10,044,000)
Fair Value	79,544,000	79,550,000	93,381,000
Held-to-maturity securities
Amortized Cost	161,874,000	164,151,000	174,273,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(22,431,000)	(23,322,000)	(6,847,000)
Fair Value	139,443,000	140,829,000	167,426,000
Mortgage-backed securities, subprime
Available-for-sale securities
Fair Value	$ 0	$ 0	$ 0

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2023 USD ($) security	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities without readily determinable fair value	$ 52,500,000
Upward adjustments of equity securities without readily determinable fair values	0	$ 0
Downward adjustments of equity securities without readily determinable fair values	0	0
Impairment of equity securities without readily determinable fair values	0	571,000
Pledged securities	$ 5,700,000,000	$ 2,500,000,000	$ 2,800,000,000
Number of securities by a single non-government sponsored issuer exceeding 10% of shareholders' equity | security	0

Investment Securities (Schedu_2

Investment Securities (Schedule of Investment Securities Portfolio Continuous Unrealized Loss Position) (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	$ 318,267,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(8,325,000)
Continuous unrealized losses existing for greater than 12 months, fair value	2,549,590,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(474,037,000)
Total, fair value	2,867,857,000
Total, unrealized losses	(482,362,000)
Subprime mortgage-backed available-for-sale securities	3,259,845,000	$ 3,243,017,000	$ 2,998,898,000
U.S. government agencies
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	29,945,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(55,000)
Continuous unrealized losses existing for greater than 12 months, fair value	44,917,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(5,083,000)
Total, fair value	74,862,000
Total, unrealized losses	(5,138,000)
Subprime mortgage-backed available-for-sale securities	74,862,000	74,222,000	49,637,000
Municipal
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	58,695,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(624,000)
Continuous unrealized losses existing for greater than 12 months, fair value	55,413,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(3,539,000)
Total, fair value	114,108,000
Total, unrealized losses	(4,163,000)
Subprime mortgage-backed available-for-sale securities	160,386,000	168,655,000	155,489,000
Financial issuers
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	9,912,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(87,000)
Continuous unrealized losses existing for greater than 12 months, fair value	72,763,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(11,233,000)
Total, fair value	82,675,000
Total, unrealized losses	(11,320,000)
Subprime mortgage-backed available-for-sale securities	82,675,000	84,703,000	81,948,000
Mortgage-backed securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	219,643,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(7,558,000)
Continuous unrealized losses existing for greater than 12 months, fair value	2,297,025,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(437,847,000)
Total, fair value	2,516,668,000
Total, unrealized losses	(445,405,000)
Subprime mortgage-backed available-for-sale securities	2,856,430,000	2,819,937,000	2,617,452,000
Collateralized mortgage obligations
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	72,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(1,000)
Continuous unrealized losses existing for greater than 12 months, fair value	79,472,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(16,335,000)
Total, fair value	79,544,000
Total, unrealized losses	(16,336,000)
Subprime mortgage-backed available-for-sale securities	79,544,000	79,550,000	93,381,000
Mortgage-backed securities, subprime
Available-for-sale securities
Subprime mortgage-backed available-for-sale securities	$ 0	$ 0	$ 0

Investment Securities (Schedu_3

Investment Securities (Schedule of Available-for-Sale Investment Securities Gross Gains and Gross Losses Realized) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Realized gains on investment securities	$ 605,000	$ 258,000
Realized losses on investment securities	(45,000)	(8,000)
Net realized gains on investment securities	560,000	250,000
Unrealized gains on equity securities with readily determinable fair value	2,290,000	180,000
Unrealized losses on equity securities with readily determinable fair value	(1,452,000)	(2,641,000)
Net unrealized gains (losses) on equity securities with readily determinable fair value	838,000	(2,461,000)
Upward adjustments of equity securities without readily determinable fair values	0	0
Downward adjustments of equity securities without readily determinable fair values	0	0
Impairment of equity securities without readily determinable fair values	0	(571,000)
Adjustment and impairment, net, of equity securities without readily determinable fair values	0	(571,000)
Gains (losses) on investment securities, net	1,398,000	(2,782,000)
Proceeds from sales of available-for-sale securities	0	0
Proceeds from sales of equity securities with readily determinable fair value	23,592,000	18,753,000
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	$ 67,000	$ 250,000

Investment Securities (Contract

Investment Securities (Contractual Maturities of Investment Securities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Available-for-sale securities
Due in one year or less, amortized cost	$ 108,880	$ 119,830	$ 48,130
Due in one to five years, amortized cost	131,959	63,644	67,138
Due in five to ten years, amortized cost	39,019	115,734	110,960
Due after ten years, amortized cost	64,194	64,590	69,329
Amortized Cost	3,739,980	3,769,634	3,193,741
Due in one year or less, fair value	108,429	119,275	47,945
Due in one to five years, fair value	122,172	61,701	66,034
Due in five to ten years, fair value	35,158	105,076	105,670
Due after ten years, fair value	58,112	57,478	68,416
Fair Value	3,259,845	3,243,017	2,998,898
Held-to-maturity securities
Held-to-maturity securities, due in one year or less, amortized cost	2,302	1,340	1,208
Held-to-maturity securities, due in one to five years, amortized cost	98,207	94,705	83,085
Held-to-maturity securities, due in five to ten years, amortized cost	110,967	115,318	101,410
Held-to-maturity securities, due after ten years, amortized cost	360,913	365,510	303,290
Amortized Cost	3,606,854	3,641,055	3,435,888
Less: Allowance for credit losses	(463)	(488)	(159)
Held-to-maturity securities, net of allowance for credit losses	3,606,391	3,640,567	3,435,729
Held-to-maturity securities, due in one year or less, fair value	2,300	1,332	1,213
Held-to-maturity securities, due in one to five years, fair value	93,717	89,093	80,210
Held-to-maturity securities, due in five to ten years, fair value	110,892	113,758	102,940
Held-to-maturity securities, due after ten years, fair value	289,473	288,460	275,270
Fair Value	2,976,198	2,949,821	3,146,427
Mortgage-backed
Available-for-sale securities
Mortgage-backed, without single maturity date, amortized cost	3,395,928	3,405,836	2,898,184
Mortgage-backed, without single maturity date, fair value	2,935,974	2,899,487	2,710,833
Held-to-maturity securities
Mortgage-backed, amortized cost	3,034,465	3,064,182	2,946,895
Mortgage-backed, fair value	$ 2,479,816	$ 2,457,178	$ 2,686,794

Loans (Summary of Loan Portfoli

Loans (Summary of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Loans [Line Items]
Total loans, net of unearned income	$ 39,565,471	$ 39,196,485	$ 35,280,547
Total loans, net of unearned income, percentage	100%	100%	100%
Commercial
Loans [Line Items]
Total loans, net of unearned income	$ 12,576,985	$ 12,549,164	$ 11,583,963
Total loans, net of unearned income, percentage	32%	32%	33%
Commercial real estate
Loans [Line Items]
Total loans, net of unearned income	$ 10,239,078	$ 9,950,947	$ 9,235,074
Total loans, net of unearned income, percentage	26%	25%	26%
Home equity
Loans [Line Items]
Total loans, net of unearned income	$ 337,016	$ 332,698	$ 321,435
Total loans, net of unearned income, percentage	1%	1%	1%
Residential real estate
Loans [Line Items]
Total loans, net of unearned income	$ 2,505,545	$ 2,372,383	$ 1,799,985
Total loans, net of unearned income, percentage	6%	6%	5%
Premium finance receivables | Property and casualty insurance
Loans [Line Items]
Total loans, net of unearned income	$ 5,738,880	$ 5,849,459	$ 4,937,408
Total loans, net of unearned income, percentage	14%	15%	14%
Premium finance receivables | Life insurance
Loans [Line Items]
Total loans, net of unearned income	$ 8,125,802	$ 8,090,998	$ 7,354,163
Total loans, net of unearned income, percentage	21%	21%	21%
Consumer and other
Loans [Line Items]
Total loans, net of unearned income	$ 42,165	$ 50,836	$ 48,519
Total loans, net of unearned income, percentage	0%	0%	0%

Loans (Narrative) (Detail)

Loans (Narrative) (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Loans [Line Items]
Net deferred loan fees and costs and fair value accounting adjustments	$ 70.9	$ 71.8	$ 59.3
Premium finance receivables
Loans [Line Items]
Unearned income portion of premium finance receivables	$ 244	$ 224.5	$ 140.3

Allowance for Credit Losses (Na

Allowance for Credit Losses (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) contract	Mar. 31, 2022 USD ($) contract	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest related to financial assets held at amortized cost	$ 245,100,000	$ 124,400,000	$ 124,400,000	$ 214,000,000
Financial Asset, Amortized Cost, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable and other	Accrued interest receivable and other	Accrued interest receivable and other	Accrued interest receivable and other
Nonaccrual loans with no related allowance for credit losses	$ 23,300,000
Provision for credit losses	23,070,000	$ 4,025,000
Loan net charge-offs	(5,500,000)	(2,500,000)
Provision for credit losses	25,000	$ 81,000
Foreclosed residential real estate properties	1,100,000
TDRs, count | contract		13	57
TDRs, balance		$ 3,097,000	$ 14,839,000
Weighted average extension term		71 months
Weighted average decrease in stated interest rate		0.79%
Loan forgiveness		$ 0
Financing Receivable | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded investment, foreclosure proceedings in process	$ 53,400,000	$ 7,700,000	$ 7,700,000

Allowance for Credit Losses (Sc

Allowance for Credit Losses (Schedule of Aging of the Company's Loan Portfolio) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 119,463	$ 98,379	$ 49,560
Loans, net of unearned income	39,565,471	39,196,485	35,280,547
Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Nonaccrual	29,245	31,279	4,661
Loans, net of unearned income	196,152	164,788	50,096
Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual	47,950	35,579	16,878
Loans, net of unearned income	12,576,985	12,549,164	11,583,963
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	10,239,078	9,950,947	9,235,074
Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Nonaccrual	5,404	416	1,054
Loans, net of unearned income	1,597,053	1,486,930	1,396,406
Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Nonaccrual	5,792	5,971	11,247
Loans, net of unearned income	8,642,025	8,464,017	7,838,668
Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,190	1,487	1,747
Loans, net of unearned income	337,016	332,698	321,435
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	2,505,545	2,372,383	1,799,985
Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	11,333	10,171	7,262
Loans, net of unearned income	2,309,393	2,207,595	1,749,889
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	18,543	13,470	6,707
Loans, net of unearned income	5,738,880	5,849,459	4,937,408
Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	0
Loans, net of unearned income	8,125,802	8,090,998	7,354,163
Consumer and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	6	6	4
Loans, net of unearned income	42,165	50,836	48,519
Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	90,218	67,100	44,899
Loans, net of unearned income	39,369,319	39,031,697	35,230,451
90+ days and still accruing
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	47,392	81,047	41,364
90+ days and still accruing | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	36,920	47,450	28,958
90+ days and still accruing | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	462	0
90+ days and still accruing | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	0
90+ days and still accruing | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	0
90+ days and still accruing | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	0
90+ days and still accruing | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	104	0	0
90+ days and still accruing | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	9,215	15,841	12,363
90+ days and still accruing | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,066	17,245	0
90+ days and still accruing | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	87	49	43
90+ days and still accruing | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	10,472	33,597	12,406
60-89 days past due
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	67,333	48,924	35,730
60-89 days past due | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	984	0
60-89 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	10,755	21,128	1,294
60-89 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	4,438	361	0
60-89 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	16,101	1,883	2,648
60-89 days past due | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	116	0	199
60-89 days past due | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	74	4,364	293
60-89 days past due | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	14,287	14,926	8,890
60-89 days past due | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	21,552	5,260	22,401
60-89 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	10	18	5
60-89 days past due | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	67,333	47,940	35,730
30-59 days past due
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	275,958	210,595	118,589
30-59 days past due | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,485	1,584	185
30-59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	95,593	56,696	31,889
30-59 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	19,616	14,390	1,409
30-59 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	53,064	16,285	28,732
30-59 days past due | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,118	2,152	545
30-59 days past due | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	19,183	9,982	18,808
30-59 days past due | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	32,545	40,557	21,278
30-59 days past due | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	52,975	68,725	15,522
30-59 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	379	224	221
30-59 days past due | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	274,473	209,011	118,404
Current
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	39,055,325	38,757,540	35,035,304
Current | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	128,502	83,491	16,292
Current | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	12,422,687	12,435,299	11,533,902
Current | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,567,595	1,471,763	1,393,943
Current | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	8,567,068	8,439,878	7,796,041
Current | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	334,592	329,059	318,944
Current | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	2,278,699	2,183,078	1,723,526
Current | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	5,664,290	5,764,665	4,888,170
Current | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	8,050,209	7,999,768	7,316,240
Current | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	41,683	50,539	48,246
Current | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	$ 38,926,823	$ 38,674,049	$ 35,019,012

Allowance for Credit Losses (Lo

Allowance for Credit Losses (Loan Portfolio by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 4,283,318
2022	9,223,672
2021	5,892,389
2020	3,520,606
2019	2,743,658
Prior	9,288,586
Revolving	4,607,959
Revolving to term	5,283
Total Loans	39,565,471	$ 35,280,547	$ 39,196,485
Current period gross write offs
2023	478
2022	4,893
2021	1,194
2020	337
2019	318
Prior	131
Revolving	0
Revolving to term	0
Total loans	7,351	4,725
Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	752,521
2022	2,645,352
2021	2,219,819
2020	963,189
2019	667,396
Prior	1,266,790
Revolving	4,057,697
Revolving to term	4,221
Total Loans	12,576,985
Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2023	42,635
2022	513,241
2021	515,074
2020	228,894
2019	134,991
Prior	149,223
Revolving	12,626
Revolving to term	369
Total Loans	1,597,053
Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	472,528
2022	1,866,721
2021	1,456,089
2020	1,026,578
2019	861,605
Prior	2,772,170
Revolving	185,685
Revolving to term	649
Total Loans	8,642,025
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	77
2020	116
2019	74
Prior	16,157
Revolving	320,548
Revolving to term	44
Total Loans	337,016	321,435	332,698
Current period gross write offs
Total loans	0	197
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	95,766
2022	820,307
2021	830,293
2020	238,480
2019	141,577
Prior	379,122
Revolving	0
Revolving to term	0
Total Loans	2,505,545	1,799,985	2,372,383
Current period gross write offs
Total loans	0	466
Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2023	2,869,954
2022	2,825,178
2021	37,543
2020	5,299
2019	906
Prior	0
Revolving	0
Revolving to term	0
Total Loans	5,738,880
Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2023	49,164
2022	550,396
2021	832,073
2020	1,057,850
2019	936,674
Prior	4,699,645
Revolving	0
Revolving to term	0
Total Loans	8,125,802
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	750
2022	2,477
2021	1,421
2020	200
2019	435
Prior	5,479
Revolving	31,403
Revolving to term	0
Total Loans	42,165	48,519	$ 50,836
Current period gross write offs
Total loans	153	$ 193
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	4,239,546
2022	9,070,338
2021	5,729,342
2020	3,434,032
2019	2,586,332
Prior	8,876,620
Revolving	4,418,070
Revolving to term	4,515
Total Loans	38,358,795
Pass | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	752,119
2022	2,576,073
2021	2,081,628
2020	940,341
2019	603,016
Prior	1,213,066
Revolving	3,872,419
Revolving to term	3,497
Total Loans	12,042,159
Pass | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2023	42,635
2022	506,714
2021	512,801
2020	204,113
2019	111,497
Prior	119,478
Revolving	12,626
Revolving to term	369
Total Loans	1,510,233
Pass | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	472,528
2022	1,862,370
2021	1,441,054
2020	1,002,397
2019	814,910
Prior	2,637,342
Revolving	184,246
Revolving to term	649
Total Loans	8,415,496
Pass | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	56
Prior	5,633
Revolving	317,387
Revolving to term	0
Total Loans	323,076
Pass | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	95,403
2022	815,003
2021	825,881
2020	225,297
2019	118,840
Prior	196,150
Revolving	0
Revolving to term	0
Total Loans	2,276,574
Pass | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2023	2,826,947
2022	2,757,313
2021	35,647
2020	5,270
2019	906
Prior	0
Revolving	0
Revolving to term	0
Total Loans	5,626,083
Pass | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2023	49,164
2022	550,396
2021	830,917
2020	1,056,414
2019	936,674
Prior	4,699,645
Revolving	0
Revolving to term	0
Total Loans	8,123,210
Pass | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	750
2022	2,469
2021	1,414
2020	200
2019	433
Prior	5,306
Revolving	31,392
Revolving to term	0
Total Loans	41,964
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	42,467
2022	112,677
2021	108,506
2020	31,527
2019	77,126
Prior	105,280
Revolving	152,647
Revolving to term	268
Total Loans	630,498
Special mention | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	402
2022	55,314
2021	92,315
2020	9,462
2019	23,220
Prior	10,695
Revolving	149,012
Revolving to term	268
Total Loans	340,688
Special mention | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	1,475
2020	16,480
2019	23,494
Prior	14,360
Revolving	0
Revolving to term	0
Total Loans	55,809
Special mention | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	4,351
2021	11,872
2020	2,140
2019	29,868
Prior	74,174
Revolving	1,439
Revolving to term	0
Total Loans	123,844
Special mention | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	1,430
Revolving	2,193
Revolving to term	0
Total Loans	3,623
Special mention | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	40
2022	3,816
2021	718
2020	1,992
2019	542
Prior	4,488
Revolving	0
Revolving to term	0
Total Loans	11,596
Special mention | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2023	42,025
2022	49,190
2021	969
2020	17
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	92,201
Special mention | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	1,156
2020	1,436
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	2,592
Special mention | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	6
2021	1
2020	0
2019	2
Prior	133
Revolving	3
Revolving to term	0
Total Loans	145
Substandard accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2023	528
2022	18,658
2021	45,533
2020	33,925
2019	30,597
Prior	123,155
Revolving	36,912
Revolving to term	500
Total Loans	289,808
Substandard accrual | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	13,415
2021	40,397
2020	2,401
2019	12,670
Prior	40,814
Revolving	36,035
Revolving to term	456
Total Loans	146,188
Substandard accrual | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	2,337
2021	0
2020	8,301
2019	0
Prior	14,969
Revolving	0
Revolving to term	0
Total Loans	25,607
Substandard accrual | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	3,163
2020	22,041
2019	16,827
Prior	54,862
Revolving	0
Revolving to term	0
Total Loans	96,893
Substandard accrual | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	8,214
Revolving	869
Revolving to term	44
Total Loans	9,127
Substandard accrual | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	323
2022	1,204
2021	1,825
2020	1,182
2019	1,100
Prior	4,256
Revolving	0
Revolving to term	0
Total Loans	9,890
Substandard accrual | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2023	205
2022	1,700
2021	148
2020	0
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	2,053
Substandard accrual | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	0
Substandard accrual | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	2
2021	0
2020	0
2019	0
Prior	40
Revolving	8
Revolving to term	0
Total Loans	50
Substandard nonaccrual/doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2023	777
2022	21,999
2021	8,239
2020	11,872
2019	30,173
Prior	16,828
Revolving	330
Revolving to term	0
Total Loans	90,218
Substandard nonaccrual/doubtful | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	550
2021	5,479
2020	10,985
2019	28,490
Prior	2,215
Revolving	231
Revolving to term	0
Total Loans	47,950
Substandard nonaccrual/doubtful | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	4,190
2021	798
2020	0
2019	0
Prior	416
Revolving	0
Revolving to term	0
Total Loans	5,404
Substandard nonaccrual/doubtful | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	5,792
Revolving	0
Revolving to term	0
Total Loans	5,792
Substandard nonaccrual/doubtful | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	77
2020	116
2019	18
Prior	880
Revolving	99
Revolving to term	0
Total Loans	1,190
Substandard nonaccrual/doubtful | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	284
2021	1,100
2020	759
2019	1,665
Prior	7,525
Revolving	0
Revolving to term	0
Total Loans	11,333
Substandard nonaccrual/doubtful | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2023	777
2022	16,975
2021	779
2020	12
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	18,543
Substandard nonaccrual/doubtful | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	0
Substandard nonaccrual/doubtful | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	6
2020	0
2019	0
Prior	0
Revolving	0
Revolving to term	0
Total Loans	6
Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	769
2020	9,250
2019	19,430
Prior	166,703
Revolving	0
Revolving to term	0
Total Loans	196,152
Early buy-out loans guaranteed by U.S. government agencies | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	769
2020	9,250
2019	19,430
Prior	166,703
Revolving	0
Revolving to term	0
Total Loans	$ 196,152

Allowance for Credit Losses (He

Allowance for Credit Losses (Held-to-Maturity Debt Securities by Credit Quality Indication) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized Cost	$ 3,606,854	$ 3,641,055	$ 3,435,888
Less: Allowance for credit losses	(463)	(488)	(159)
Held-to-maturity securities, net of allowance for credit losses	3,606,391	3,640,567	3,435,729
U.S. government agencies
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	160,000
2021	147,804
2020	25,000
2019	4,000
Prior	2,804
Amortized Cost	339,608	339,614	264,661
U.S. government agencies | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	160,000
2021	147,804
2020	25,000
2019	4,000
Prior	2,804
Amortized Cost	339,608
U.S. government agencies | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023
2022
2021
2020
2019
Prior
Amortized Cost	0
U.S. government agencies | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023
2022
2021
2020
2019
Prior
Amortized Cost	0
Municipal
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	1,042
2021	6,978
2020	264
2019	618
Prior	165,818
Amortized Cost	174,720	$ 179,027	$ 180,548
Municipal | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	1,042
2021	6,978
2020	264
2019	618
Prior	165,818
Amortized Cost	174,720
Municipal | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Amortized Cost	0
Municipal | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Amortized Cost	0
Mortgage-backed securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	5,065
2022	606,922
2021	2,422,478
2020	0
2019	0
Prior	0
Amortized Cost	3,034,465
Mortgage-backed securities | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	5,065
2022	606,922
2021	2,422,478
2020	0
2019	0
Prior	0
Amortized Cost	3,034,465
Mortgage-backed securities | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Amortized Cost	0
Mortgage-backed securities | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Amortized Cost	0
Corporate notes
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	14,964
2021	0
2020	6,009
2019	7,291
Prior	29,797
Amortized Cost	58,061
Corporate notes | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	14,964
2021	0
2020	6,009
2019	7,291
Prior	29,797
Amortized Cost	58,061
Corporate notes | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Amortized Cost	0
Corporate notes | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Amortized Cost	$ 0

Allowance for Credit Losses (Co

Allowance for Credit Losses (Components of Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	$ 375,798	$ 357,448	$ 301,168	$ 299,653
Allowance for held-to-maturity securities losses	463	488	159
Allowance for credit losses	376,261	357,936	301,327
Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	287,972	270,173	250,539
Unfunded lending-related commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	87,826	87,275	50,629
Loans and unfunded lending-related commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	$ 375,798	$ 357,448	$ 301,168

Allowance for Credit Losses (Su

Allowance for Credit Losses (Summary of Activity in the Allowance for Credit Losses by Loan Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ 357,448	$ 299,653	$ 299,653
Other adjustments	4	22
Charge-offs	(7,351)	(4,725)
Recoveries	1,886	2,193
Provision for credit losses	23,070	4,025
Allowance for credit losses at period end	375,798	301,168	$ 357,448
Cumulative effect adjustment from the adoption of ASU 2016-13, net of tax			Accounting Standards Update 2022-02
Individually measured	12,903	5,152
Collectively measured	362,895	296,016
Loans at period end, individually evaluated for impairment	71,622	72,846
Loans at period end, collectively evaluated for impairment	39,286,317	35,149,717
Loans held-for-investment	207,532	57,984
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	741
Allowance for credit losses at period end			$ 741
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	142,769	119,307	119,307
Other adjustments	0	0
Charge-offs	(2,543)	(1,414)
Recoveries	392	538
Provision for credit losses	8,772	2,480
Allowance for credit losses at period end	149,501	120,911	142,769
Individually measured	11,281	3,698
Collectively measured	138,220	117,213
Loans at period end, individually evaluated for impairment	47,950	19,651
Loans at period end, collectively evaluated for impairment	12,529,035	11,564,312
Loans held-for-investment	0	0
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	111
Allowance for credit losses at period end			111
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	184,352	144,583	144,583
Other adjustments	0	0
Charge-offs	(5)	(777)
Recoveries	100	32
Provision for credit losses	8,977	1,068
Allowance for credit losses at period end	194,780	144,906	184,352
Individually measured	1,621	522
Collectively measured	193,159	144,384
Loans at period end, individually evaluated for impairment	11,196	22,370
Loans at period end, collectively evaluated for impairment	10,227,882	9,212,704
Loans held-for-investment	0	0
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	1,356
Allowance for credit losses at period end			1,356
Home  Equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	7,573	10,699	10,699
Other adjustments	0	0
Charge-offs	0	(197)
Recoveries	35	93
Provision for credit losses	153	(29)
Allowance for credit losses at period end	7,728	10,566	7,573
Individually measured	0	127
Collectively measured	7,728	10,439
Loans at period end, individually evaluated for impairment	1,190	12,904
Loans at period end, collectively evaluated for impairment	335,826	308,531
Loans held-for-investment	0	0
Home  Equity | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	(33)
Allowance for credit losses at period end			(33)
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	11,585	8,782	8,782
Other adjustments	0	0
Charge-offs	0	(466)
Recoveries	4	5
Provision for credit losses	537	1,108
Allowance for credit losses at period end	11,434	9,429	11,585
Individually measured	0	800
Collectively measured	11,434	8,629
Loans at period end, individually evaluated for impairment	11,280	17,842
Loans at period end, collectively evaluated for impairment	2,286,733	1,724,159
Loans held-for-investment	207,532	57,984
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	(692)
Allowance for credit losses at period end			(692)
Premium Finance Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	10,671	15,859	15,859
Other adjustments	4	22
Charge-offs	(4,650)	(1,678)
Recoveries	1,323	1,476
Provision for credit losses	4,607	(957)
Allowance for credit losses at period end	11,955	14,722	10,671
Individually measured	0	0
Collectively measured	11,955	14,722
Loans at period end, individually evaluated for impairment	0	0
Loans at period end, collectively evaluated for impairment	13,864,682	12,291,571
Loans held-for-investment	0	0
Premium Finance Receivables | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	0
Allowance for credit losses at period end			0
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	498	423	423
Other adjustments	0	0
Charge-offs	(153)	(193)
Recoveries	32	49
Provision for credit losses	24	355
Allowance for credit losses at period end	400	634	498
Individually measured	1	5
Collectively measured	399	629
Loans at period end, individually evaluated for impairment	6	79
Loans at period end, collectively evaluated for impairment	42,159	48,440
Loans held-for-investment	0	$ 0
Consumer and other | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ (1)
Allowance for credit losses at period end			$ (1)

Allowance for Credit Losses (_2

Allowance for Credit Losses (Summary of the Post-Modification Balance of Loans Experiencing Financial Difficulties) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 40,729
Percentage of Total Class of Loan	0.10%
Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 3,864
Duration of extension and delayed payment terms	27 months
Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 1,319
Reduction of interest rate	2.75%
Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 35,304
Duration of extension and delayed payment terms	17 months
Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 242
Commercial | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 37,474
Percentage of Total Class of Loan	0.30%
Commercial | Commercial, industrial and other | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 1,938
Commercial | Commercial, industrial and other | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	221
Commercial | Commercial, industrial and other | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	35,265
Commercial | Commercial, industrial and other | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	50
Commercial real estate | Non-construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 1,333
Percentage of Total Class of Loan	0%
Commercial real estate | Non-construction | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 467
Commercial real estate | Non-construction | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	827
Commercial real estate | Non-construction | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	39
Commercial real estate | Non-construction | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 203
Percentage of Total Class of Loan	0.10%
Home equity | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 203
Home equity | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Home equity | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Home equity | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 1,708
Percentage of Total Class of Loan	0.10%
Residential real estate | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 1,253
Residential real estate | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	271
Residential real estate | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Residential real estate | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	184
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 11
Percentage of Total Class of Loan	0%
Premium finance receivables | Property and casualty insurance loans | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 3
Premium finance receivables | Property and casualty insurance loans | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Premium finance receivables | Property and casualty insurance loans | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0
Premium finance receivables | Property and casualty insurance loans | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 8

Allowance for Credit Losses (_3

Allowance for Credit Losses (Summary of Loans Experiencing Financial Difficulties Subsequently Defaulted) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	$ 40,729
Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	945
Commercial | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	37,474
Commercial | Commercial, industrial and other | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	2
Commercial real estate | Non-construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	1,333
Commercial real estate | Non-construction | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	828
Home equity | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	203
Home equity | Commercial, industrial and other | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	104
Residential real estate | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	1,708
Residential real estate | Commercial, industrial and other | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	0
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	11
Premium finance receivables | Property and casualty insurance loans | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans in payment default under restructured terms	$ 11

Allowance for Credit Losses (_4

Allowance for Credit Losses (Summary of the Post-Modification Balance of Loans Restructured) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) contract	Mar. 31, 2022 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	13	57
TDRs, balance | $	$ 3,097	$ 14,839
Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	11
TDRs, balance | $	$ 2,206
Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	9
TDRs, balance | $	$ 2,025
Modification to Interest-only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	4
TDRs, balance | $	$ 2,154
Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	0
TDRs, balance | $	$ 0
Commercial, industrial and other | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	3	17
TDRs, balance | $	$ 282	$ 5,205
Commercial, industrial and other | Commercial, industrial and other | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	2
TDRs, balance | $	$ 120
Commercial, industrial and other | Commercial, industrial and other | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	1
TDRs, balance | $	$ 85
Commercial, industrial and other | Commercial, industrial and other | Modification to Interest-only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	2
TDRs, balance | $	$ 247
Commercial, industrial and other | Commercial, industrial and other | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	0
TDRs, balance | $	$ 0
Commercial real estate | Non-construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	2	5
TDRs, balance | $	$ 1,907	$ 4,613
Commercial real estate | Non-construction | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	1
TDRs, balance | $	$ 1,178
Commercial real estate | Non-construction | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	1
TDRs, balance | $	$ 1,178
Commercial real estate | Non-construction | Modification to Interest-only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	2
TDRs, balance | $	$ 1,907
Commercial real estate | Non-construction | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	0
TDRs, balance | $	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	8	35
TDRs, balance | $	$ 908	$ 5,021
Residential real estate | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	8
TDRs, balance | $	$ 908
Residential real estate | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	7
TDRs, balance | $	$ 762
Residential real estate | Modification to Interest-only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	0
TDRs, balance | $	$ 0
Residential real estate | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	0
TDRs, balance | $	$ 0

Allowance for Credit Losses (_5

Allowance for Credit Losses (Summary of Loans Restructured and Subsequently Defaulted Under the Restructured Terms) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) contract	Mar. 31, 2022 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	13	57
TDRs, balance | $	$ 3,097	$ 14,839
Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	14
TDRs, balance | $	$ 6,793
Commercial, industrial and other | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	3	17
TDRs, balance | $	$ 282	$ 5,205
Commercial, industrial and other | Commercial, industrial and other | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	11
TDRs, balance | $	$ 4,526
Commercial real estate | Non-construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	2	5
TDRs, balance | $	$ 1,907	$ 4,613
Commercial real estate | Non-construction | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	2
TDRs, balance | $	$ 2,163
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	8	35
TDRs, balance | $	$ 908	$ 5,021
Residential real estate | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contract	1
TDRs, balance | $	$ 104

Goodwill and Other Acquisitio_3

Goodwill and Other Acquisition-Related Intangible Assets (Goodwill Assets by Business Segment) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 653,524
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	63
Ending balance	653,587
Community banking
Goodwill [Roll Forward]
Beginning balance	545,671
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	545,671
Specialty finance
Goodwill [Roll Forward]
Beginning balance	38,480
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	63
Ending balance	38,543
Wealth management
Goodwill [Roll Forward]
Beginning balance	69,373
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	$ 69,373

Goodwill and Other Acquisitio_4

Goodwill and Other Acquisition-Related Intangible Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Indefinite-lived Intangible Assets [Line Items]
Amortization of other acquisition-related intangible assets	$ 1,235	$ 1,609
Specialty finance
Indefinite-lived Intangible Assets [Line Items]
Goodwill increase for foreign currency translation adjustments	$ 63
Specialty finance | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	18 years
Community banking | Core deposit intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years
Wealth management | Customer list and other intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years

Goodwill and Other Acquisitio_5

Goodwill and Other Acquisition-Related Intangible Assets (Summary of Intangible Assets) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Intangibles with finite lives
Accumulated amortization	$ (62,447)	$ (61,212)	$ (56,705)
Intangibles with indefinite lives
Gross carrying amount	83,398	83,398	83,404
Total net carrying amount	20,951	22,186	26,699
Community banking
Intangibles with indefinite lives
Total net carrying amount	17,533	18,505	21,763
Community banking | Trademark
Intangibles with indefinite lives
Carrying amount	5,800	5,800	5,800
Community banking | Core deposit intangibles
Intangibles with finite lives
Gross carrying amount	55,206	55,206	55,206
Accumulated amortization	(43,473)	(42,501)	(39,243)
Net carrying amount	11,733	12,705	15,963
Specialty finance | Customer list intangibles
Intangibles with finite lives
Gross carrying amount	1,962	1,962	1,968
Accumulated amortization	(1,799)	(1,785)	(1,738)
Net carrying amount	163	177	230
Wealth management | Customer list and other intangibles
Intangibles with finite lives
Gross carrying amount	20,430	20,430	20,430
Accumulated amortization	(17,175)	(16,926)	(15,724)
Net carrying amount	$ 3,255	$ 3,504	$ 4,706

Goodwill and Other Acquisitio_6

Goodwill and Other Acquisition-Related Intangible Assets (Estimated Amortization) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Actual in three months ended March 31, 2023	$ 1,235	$ 1,609
Estimated remaining in 2023	3,422
Estimated—2024	3,259
Estimated—2025	2,552
Estimated—2026	1,954
Estimated—2027	$ 1,450

Mortgage Servicing Rights ("M_3

Mortgage Servicing Rights ("MSRs") (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value at beginning of the period	$ 230,225	$ 147,571
Additions from loans sold with servicing retained	5,107	14,401
Estimate of changes in fair value due to:
Early buyout options (“EBO”) exercised	0	(175)
Payoffs and paydowns	(3,909)	(6,016)
Changes in valuation inputs or assumptions	(6,953)	43,365
Fair value at end of the period	224,470	199,146
Unpaid principal balance of mortgage loans serviced for others	$ 14,080,461	$ 13,426,535

Deposits (Detail)

Deposits (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Balance:
Non-interest-bearing	$ 11,236,083	$ 12,668,160	$ 13,748,918
NOW and interest-bearing demand deposits	5,576,558	5,591,986	5,089,724
Wealth management deposits	1,809,933	2,463,833	2,542,995
Money market	13,552,277	12,886,795	13,012,460
Savings	5,192,108	4,556,635	4,089,230
Time certificates of deposit	5,351,252	4,735,135	3,735,995
Total deposits	$ 42,718,211	$ 42,902,544	$ 42,219,322
Mix:
Non-interest-bearing	26%	30%	32%
NOW and interest-bearing demand deposits	13%	13%	12%
Wealth management deposits	4%	5%	6%
Money market	32%	30%	31%
Savings	12%	11%	10%
Time certificates of deposit	13%	11%	9%
Total deposits	100%	100%	100%

FHLB Advances, Other Borrowin_3

FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Debt Disclosure [Abstract]
FHLB advances	$ 2,316,071	$ 2,316,071	$ 1,241,071
Other borrowings:
Notes payable	192,666	199,793	74,969
Short-term borrowings	10,124	17,612	15,872
Secured borrowings	320,007	317,942	328,889
Other	60,751	61,267	62,786
Total other borrowings	583,548	596,614	482,516
Subordinated notes	437,493	437,392	437,033
Total FHLB advances, other borrowings and subordinated notes	$ 3,337,112	$ 3,350,077	$ 2,160,620

FHLB Advances, Other Borrowin_4

FHLB Advances, Other Borrowings and Subordinated Notes (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Debt Instrument [Line Items]
Secured borrowings	$ 320,007,000	$ 317,942,000	$ 328,889,000
Secured Debt
Debt Instrument [Line Items]
Secured borrowings	9,400,000
Collateral Pledged
Debt Instrument [Line Items]
Pledged financial instruments	18,300,000
Term Loan Facility
Debt Instrument [Line Items]
Amount outstanding	192,700,000
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding	0
Receivables Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Secured borrowings	$ 310,600,000	$ 309,700,000	$ 319,800,000
Receivables Purchase Agreement | Secured Debt | Canadian Commercial Paper Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.78%

FHLB Advances, Other Borrowin_5

FHLB Advances, Other Borrowings and Subordinated Notes (Schedule of Financial Instruments Owned and Pledged as Collateral) (Details) - Securities sold under repurchase agreements - Overnight Sweep Collateral $ in Thousands	Mar. 31, 2023 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Excess collateral	$ 8,224
Securities sold under repurchase agreements	10,124
Mortgage-backed securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Mortgage-backed securities	$ 18,348

Junior Subordinated Debenture_2

Junior Subordinated Debentures (Summary of Junior Subordinated Debentures) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 253,566	$ 253,566	$ 253,566
Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 253,566	$ 253,600	$ 253,600
Average contractual rate	7.16%
Junior Subordinated Debt | Wintrust Capital Trust III
Subordinated Borrowing [Line Items]
Common Securities	$ 774
Trust  Preferred Securities	25,000
Junior subordinated debentures	$ 25,774
Contractual rate	8.08%
Junior Subordinated Debt | Wintrust Capital Trust III | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	3.25%
Junior Subordinated Debt | Wintrust Statutory Trust IV
Subordinated Borrowing [Line Items]
Common Securities	$ 619
Trust  Preferred Securities	20,000
Junior subordinated debentures	$ 20,619
Contractual rate	7.96%
Junior Subordinated Debt | Wintrust Statutory Trust IV | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	2.80%
Junior Subordinated Debt | Wintrust Statutory Trust V
Subordinated Borrowing [Line Items]
Common Securities	$ 1,238
Trust  Preferred Securities	40,000
Junior subordinated debentures	$ 41,238
Contractual rate	7.76%
Junior Subordinated Debt | Wintrust Statutory Trust V | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	2.60%
Junior Subordinated Debt | Wintrust Capital Trust VII
Subordinated Borrowing [Line Items]
Common Securities	$ 1,550
Trust  Preferred Securities	50,000
Junior subordinated debentures	$ 51,550
Contractual rate	6.82%
Junior Subordinated Debt | Wintrust Capital Trust VII | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	1.95%
Junior Subordinated Debt | Wintrust Capital Trust VIII
Subordinated Borrowing [Line Items]
Common Securities	$ 1,238
Trust  Preferred Securities	25,000
Junior subordinated debentures	$ 26,238
Contractual rate	6.61%
Junior Subordinated Debt | Wintrust Capital Trust VIII | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	1.45%
Junior Subordinated Debt | Wintrust Capital Trust IX
Subordinated Borrowing [Line Items]
Common Securities	$ 1,547
Trust  Preferred Securities	50,000
Junior subordinated debentures	$ 51,547
Contractual rate	6.50%
Junior Subordinated Debt | Wintrust Capital Trust IX | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	1.63%
Junior Subordinated Debt | Northview Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 186
Trust  Preferred Securities	6,000
Junior subordinated debentures	$ 6,186
Contractual rate	7.81%
Junior Subordinated Debt | Northview Capital Trust I | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	3%
Junior Subordinated Debt | Town Bankshares Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 186
Trust  Preferred Securities	6,000
Junior subordinated debentures	$ 6,186
Contractual rate	7.81%
Junior Subordinated Debt | Town Bankshares Capital Trust I | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	3%
Junior Subordinated Debt | First Northwest Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 155
Trust  Preferred Securities	5,000
Junior subordinated debentures	$ 5,155
Contractual rate	8.16%
Junior Subordinated Debt | First Northwest Capital Trust I | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	3%
Junior Subordinated Debt | Suburban Illinois Capital Trust II
Subordinated Borrowing [Line Items]
Common Securities	$ 464
Trust  Preferred Securities	15,000
Junior subordinated debentures	$ 15,464
Contractual rate	6.62%
Junior Subordinated Debt | Suburban Illinois Capital Trust II | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	1.75%
Junior Subordinated Debt | Community Financial Shares Statutory Trust II
Subordinated Borrowing [Line Items]
Common Securities	$ 109
Trust  Preferred Securities	3,500
Junior subordinated debentures	$ 3,609
Contractual rate	6.49%
Junior Subordinated Debt | Community Financial Shares Statutory Trust II | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate Structure	1.62%

Junior Subordinated Debenture_3

Junior Subordinated Debentures (Narrative) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 253,566	$ 253,566	$ 253,566
Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 253,566	$ 253,600	$ 253,600
Weighted average contractual rate	7.16%

Segment Information (Narrative)

Segment Information (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2023 subsidiary segment
Segment Reporting Information [Line Items]
Number of reportable segments	3
Number of subsidiaries | subsidiary	15
Community banking
Segment Reporting Information [Line Items]
Number of reportable segments	1

Segment Information (Summary of

Segment Information (Summary of Segment Information) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Net interest income:
Net interest income	$ 457,995	$ 299,294
Net interest income, change in contribution	$ 158,701
Net interest income, percent change in contribution	53%
Provision for credit losses:
Provision for credit losses	$ 23,045	4,106
Provision for credit losses, change in contribution	18,939
Non-interest income:
Non-interest income	107,769	162,790
Non-interest income, change in contribution	$ (55,021)
Non-interest income, percent change in contribution	(34.00%)
Net revenue:
Net revenue	$ 565,764	462,084
Net revenue, change in contribution	$ 103,680
Net revenue, percent change in contribution	22%
Segment profit:
Segment profit	$ 180,198	127,391
Segment profit, change in contribution	$ 52,807
Segment profit, percent change in contribution	41%
Segment assets:
Segment assets	$ 52,873,511	50,250,661	$ 52,949,649
Segment assets, change in contribution	$ 2,622,850
Segment assets, percent change in contribution	5%
Community banking
Segment profit:
Segment profit	$ 134,232	90,099
Segment profit, change in contribution	$ 44,133
Segment profit, percent change in contribution	49%
Segment assets:
Segment assets	$ 41,611,980	40,050,015
Segment assets, change in contribution	$ 1,561,965
Segment assets, percent change in contribution	4%
Specialty finance
Segment profit:
Segment profit	$ 36,737	29,604
Segment profit, change in contribution	$ 7,133
Segment profit, percent change in contribution	24%
Segment assets:
Segment assets	$ 9,841,044	8,624,501
Segment assets, change in contribution	$ 1,216,543
Segment assets, percent change in contribution	14%
Wealth management
Segment profit:
Segment profit	$ 9,229	7,688
Segment profit, change in contribution	$ 1,541
Segment profit, percent change in contribution	20%
Segment assets:
Segment assets	$ 1,420,487	1,576,145
Segment assets, change in contribution	$ (155,658)
Segment assets, percent change in contribution	(10.00%)
Operating Segments
Net interest income:
Net interest income	$ 449,154	292,361
Net interest income, change in contribution	$ 156,793
Net interest income, percent change in contribution	54%
Provision for credit losses:
Provision for credit losses	$ 23,045	4,106
Provision for credit losses, change in contribution	18,939
Non-interest income:
Non-interest income	124,820	176,588
Non-interest income, change in contribution	$ (51,768)
Non-interest income, percent change in contribution	(29.00%)
Net revenue:
Net revenue	$ 573,974	468,949
Net revenue, change in contribution	$ 105,025
Net revenue, percent change in contribution	22%
Operating Segments | Community banking
Net interest income:
Net interest income	$ 369,848	228,615
Net interest income, change in contribution	$ 141,233
Net interest income, percent change in contribution	62%
Provision for credit losses:
Provision for credit losses	$ 21,099	4,118
Provision for credit losses, change in contribution	16,981
Non-interest income:
Non-interest income	68,733	121,888
Non-interest income, change in contribution	$ (53,155)
Non-interest income, percent change in contribution	(44.00%)
Net revenue:
Net revenue	$ 438,581	350,503
Net revenue, change in contribution	$ 88,078
Net revenue, percent change in contribution	25%
Operating Segments | Specialty finance
Net interest income:
Net interest income	$ 70,351	55,370
Net interest income, change in contribution	$ 14,981
Net interest income, percent change in contribution	27%
Provision for credit losses:
Provision for credit losses	$ 1,946	(12)
Provision for credit losses, change in contribution	1,958
Non-interest income:
Non-interest income	25,790	24,122
Non-interest income, change in contribution	$ 1,668
Non-interest income, percent change in contribution	7%
Net revenue:
Net revenue	$ 96,141	79,492
Net revenue, change in contribution	$ 16,649
Net revenue, percent change in contribution	21%
Operating Segments | Wealth management
Net interest income:
Net interest income	$ 8,955	8,376
Net interest income, change in contribution	$ 579
Net interest income, percent change in contribution	7%
Provision for credit losses:
Provision for credit losses	$ 0	0
Provision for credit losses, change in contribution	$ 0
Provision for credit losses, percent change in contribution	0%
Non-interest income:
Non-interest income	$ 30,297	30,578
Non-interest income, change in contribution	$ (281)
Non-interest income, percent change in contribution	(1.00%)
Net revenue:
Net revenue	$ 39,252	38,954
Net revenue, change in contribution	$ 298
Net revenue, percent change in contribution	1%
Intersegment Eliminations
Net interest income:
Net interest income	$ 8,841	6,933
Net interest income, change in contribution	$ 1,908
Net interest income, percent change in contribution	28%
Provision for credit losses:
Provision for credit losses	$ 0	0
Provision for credit losses, change in contribution	$ 0
Provision for credit losses, percent change in contribution	0%
Non-interest income:
Non-interest income	$ (17,051)	(13,798)
Non-interest income, change in contribution	$ (3,253)
Non-interest income, percent change in contribution	24%
Net revenue:
Net revenue	$ (8,210)	$ (6,865)
Net revenue, change in contribution	$ (1,345)
Net revenue, percent change in contribution	20%

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Derivative [Line Items]
Derivative Assets	$ 274,004	$ 296,848	$ 153,534
Derivative Liabilities	274,432	338,078	122,107
Interest rate derivatives
Derivative [Line Items]
Derivative Assets	259,331	286,438	139,701
Derivative Liabilities	262,465	329,307	120,079
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	39,462	16,768	20,645
Derivative Liabilities	43,412	58,198	5,077
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Cash Flow Hedges
Derivative [Line Items]
Derivative Assets	25,730	0	13,257
Derivative Liabilities	43,412	58,198	3,361
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Fair Value Hedges
Derivative [Line Items]
Derivative Assets	13,732	16,768	7,388
Derivative Liabilities	0	0	1,716
Not designated as hedging instrument
Derivative [Line Items]
Derivative Assets	234,542	280,080	132,889
Derivative Liabilities	231,020	279,880	117,030
Not designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	219,869	269,670	119,056
Derivative Liabilities	219,053	271,109	115,002
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	5,356	1,711	3,447
Derivative Liabilities	67	58	1,558
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	121	220	10,063
Derivative Liabilities	2,953	414	147
Not designated as hedging instrument | Commodity forward contracts
Derivative [Line Items]
Derivative Assets	491	257	0
Derivative Liabilities	315	162	0
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	8,705	8,222	323
Derivative Liabilities	$ 8,632	$ 8,137	$ 323

Derivative Financial Instrume_4

Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) - Designated as hedging instrument - Cash Flow Hedging $ in Thousands	Mar. 31, 2023 USD ($)
Derivative [Line Items]
Notional Amount	$ 6,000,000
Fair Value Asset (Liability)	(17,682)
Buy 2.250% floor, sell 3.743% cap; matures September 2025
Derivative [Line Items]
Notional Amount	1,250,000
Fair Value Asset (Liability)	$ (16,675)
Derivative floor rate	0.02250
Derivative cap rate	0.03743
Buy 2.750% floor, sell 4.320% cap; matures October 2026
Derivative [Line Items]
Notional Amount	$ 500,000
Fair Value Asset (Liability)	$ (126)
Derivative floor rate	0.02750
Derivative cap rate	0.04320
Buy 2.000% floor, sell 3.450% cap; matures September 2027
Derivative [Line Items]
Notional Amount	$ 1,250,000
Fair Value Asset (Liability)	$ (26,069)
Derivative floor rate	0.02000
Derivative cap rate	0.03450
Fixed 3.748%; matures December 2025
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 26
Derivative fixed interest rate	3.748%
Fixed 3.759%; matures December 2025
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 99
Derivative fixed interest rate	3.759%
Fixed 3.680%; matures February 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (251)
Derivative fixed interest rate	3.68%
Fixed 4.176%; matures March 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 3,342
Derivative fixed interest rate	4.176%
Fixed 3.915%; matures March 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 1,531
Derivative fixed interest rate	3.915%
Fixed 4.450%; matures July 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 6,502
Derivative fixed interest rate	4.45%
Fixed 3.515%, matures December 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 123
Derivative fixed interest rate	3.515%
Fixed 3.512%; matures December 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 97
Derivative fixed interest rate	3.512%
Fixed 3.453%; matures February 2027
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (291)
Derivative fixed interest rate	3.453%
Fixed 4.150%; matures July 2027
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 7,238
Derivative fixed interest rate	4.15%
Fixed 3.748%; matures March 2028
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 4,649
Derivative fixed interest rate	3.748%
Fixed 3.526%; matures March 2028
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 2,123
Derivative fixed interest rate	3.526%

Derivative Financial Instrume_5

Derivative Financial Instruments (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2023 USD ($) derivativeInstrument	Dec. 31, 2022 USD ($) derivativeInstrument	Sep. 30, 2022	Jun. 30, 2022 USD ($) derivativeInstrument	Mar. 31, 2022 USD ($) derivativeInstrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	$ 85,800,000
Net derivative liability position, aggregate fair value	0
Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	19,200,000
Interest Rate Swap And Collar
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	66,600,000
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 245,000,000	$ 190,000,000
Number of derivative instruments held | derivativeInstrument	3	3
Not designated as hedging instrument | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 0
Not designated as hedging instrument | Interest rate contract terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 1,000,000,000
Not designated as hedging instrument | Interest rate contract, qualified borrowers
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	9,900,000,000	9,600,000,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	208,200,000	121,600,000
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	498,000,000	321,000,000
Not designated as hedging instrument | Commodity forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	5,600,000	3,600,000
Not designated as hedging instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 225,200,000	$ 226,200,000
Not designated as hedging instrument | Covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivativeInstrument	0	0			0
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 6,000,000,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount				$ 500,000,000	$ 1,000,000,000
Derivative term			5 years
Fair value of derivative contracts					$ 66,500,000
Number of derivative instruments held | derivativeInstrument				2
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing March 2023
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative contracts	3,700,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated, Original Swap Maturing April 2024
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of derivative contracts	10,700,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Collar Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 64,300,000
Fair value of derivative contracts	875,000
Number of derivative instruments terminated | derivativeInstrument		1
Interest rate derivatives designated as Fair Value Hedges | Designated as hedging instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 206,000,000
Number of interest rate derivatives | derivativeInstrument	14

Derivative Financial Instrume_6

Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges) (Detail) - Interest rate contract - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized gain at beginning of period	$ 10,026	$ 36,908
Amount reclassified from accumulated other comprehensive income or loss to interest income or expense on deposits, loans, and other borrowings	3,572	5,353
Amount of gain recognized in other comprehensive income or loss	31,094	34,128
Unrealized gain at end of period	$ 44,692	$ 76,389

Derivative Financial Instrume_7

Derivative Financial Instruments (Derivatives in Fair Value Hedging Relationships) (Detail) - Designated as Hedging Instrument - Interest rate swaps $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Interest and fees on loans
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	$ (9)
Interest income - investment securities
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	0
Loans, net of unearned income
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	138,254
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(13,682)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	(100)
Available-for-sale debt securities
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	898
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(15)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	$ 0

Derivative Financial Instrume_8

Derivative Financial Instruments (Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest rate swaps and caps | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 800	$ 4,024
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	3,640	(7,369)
Commodity contracts | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	177	0
Foreign exchange contracts | Trading gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	0	0
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	10,391	3,742
Derivative contract held as economic hedge on MSRs | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 946	$ 0

Derivative Financial Instrume_9

Derivative Financial Instruments (Summary of Interest Rate Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Derivative Assets
Derivative Assets	$ 274,004	$ 296,848	$ 153,534
Derivative Liabilities
Gross Amounts Recognized	274,432	338,078	122,107
Interest rate contract
Derivative Assets
Derivative Assets	259,331	286,438	139,701
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	259,331	286,438	139,701
Offsetting Derivative Positions	(55,838)	(64,100)	(19,557)
Collateral Posted	(181,884)	(194,666)	(70,807)
Net Credit Exposure	21,609	27,672	49,337
Derivative Liabilities
Gross Amounts Recognized	262,465	329,307	120,079
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	262,465	329,307	120,079
Offsetting Derivative Positions	(55,838)	(64,100)	(19,557)
Collateral Posted	0	0	(257)
Net Credit Exposure	$ 206,627	$ 265,207	$ 100,265

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 3,259,845,000	$ 3,243,017,000	$ 2,998,898,000
Loans held-for-investment	207,532,000		57,984,000
MSRs	224,470,000	230,225,000	199,146,000	$ 147,571,000
Individually assessed loans - foreclosure probable and collateral-dependent	71,622,000		72,846,000
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,259,845,000	3,243,017,000	2,998,898,000
Remaining contractual principal balance outstanding, mortgage loans held-for-sale	307,300,000	308,900,000	606,700,000
Remaining contractual principal balance outstanding, mortgage loans held-for-investment	204,500,000	184,000,000	58,700,000
Non-performing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale classified as nonaccrual	3,300,000	5,800,000	0
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing	$ 41,400,000	44,000,000	113,000,000
Weighted Average | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life of loans	5 years 4 months 24 days
Appraisal adjustment - cost of sale | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input	0.10
Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale	$ 302,493,000	299,935,000	606,545,000
Loans held-for-investment	202,143,000	179,932,000	57,984,000
MSRs	224,470,000	230,225,000	199,146,000
Derivative assets	274,004,000	296,848,000	153,534,000
Measured at fair value on a non-recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,622,000
Other real estate owned	9,361,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,600,000
Level 3 | Portion at Other than Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	0
Level 3 | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale	44,250,000	48,655,000	0
Loans held-for-investment	69,493,000	84,165,000	44,464,000
MSRs	224,470,000	230,225,000	199,146,000
Derivative assets	$ 5,356,000	1,711,000	3,447,000
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.1033
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0596
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0598
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.1033
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.03
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.03
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.33
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.33
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.0692
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0692
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0692
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Minimum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	1
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Maximum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	1
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Weighted Average | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0022
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Weighted Average | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0086
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Minimum | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Minimum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Maximum | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.10
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Maximum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.13
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Weighted Average | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	76
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input | $ / shares	70
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input | $ / shares	200
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Weighted Average | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	403
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input | $ / shares	200
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input | $ / shares	1,000
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Weighted Average | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	0.8206
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	0.31
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	1
Level 3 | Measured at fair value on a non-recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	$ 71,622,000
Other real estate owned	9,361,000
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	160,386,000	168,655,000	155,489,000
Municipal securities | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	160,386,000	168,655,000	155,489,000
Municipal securities | Level 3 | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 112,257,000	$ 117,537,000	$ 100,401,000

Fair Values of Assets and Lia_4

Fair Values of Assets and Liabilities (Summary of Balances of Assets and Liabilities Measured at Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 3,259,845	$ 3,243,017	$ 2,998,898
Equity securities with readily determinable fair value	111,943	110,365	92,689
Loans held-for-investment	207,532		57,984
MSRs	224,470	230,225	199,146	$ 147,571
U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4,948	14,948	0
U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	74,862	74,222	49,637
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	160,386	168,655	155,489
Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	102	1,127	852
Equity securities with readily determinable fair value	111,943	110,365	92,689
Mortgage loans held-for-sale	302,493	299,935	606,545
Loans held-for-investment	202,143	179,932	57,984
MSRs	224,470	230,225	199,146
Nonqualified deferred compensation assets	14,379	13,899	15,447
Derivative assets	274,004	296,848	153,534
Total	4,389,379	4,375,348	4,125,095
Derivative liabilities	274,432	338,078	122,107
Measured at fair value on a recurring basis: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	0	0	0
Equity securities with readily determinable fair value	103,877	102,299	84,623
Mortgage loans held-for-sale	0	0	0
Loans held-for-investment	0	0	0
MSRs	0	0	0
Nonqualified deferred compensation assets	0	0	0
Derivative assets	0	0	0
Total	108,825	117,247	84,623
Derivative liabilities	0	0	0
Measured at fair value on a recurring basis: | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	102	1,127	852
Equity securities with readily determinable fair value	8,066	8,066	8,066
Mortgage loans held-for-sale	258,243	251,280	606,545
Loans held-for-investment	132,650	95,767	13,520
MSRs	0	0	0
Nonqualified deferred compensation assets	14,379	13,899	15,447
Derivative assets	268,648	295,137	150,087
Total	3,824,728	3,775,808	3,693,014
Derivative liabilities	274,432	338,078	122,107
Measured at fair value on a recurring basis: | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	0	0	0
Equity securities with readily determinable fair value	0	0	0
Mortgage loans held-for-sale	44,250	48,655	0
Loans held-for-investment	69,493	84,165	44,464
MSRs	224,470	230,225	199,146
Nonqualified deferred compensation assets	0	0	0
Derivative assets	5,356	1,711	3,447
Total	455,826	482,293	347,458
Derivative liabilities	0	0	0
Measured at fair value on a recurring basis: | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4,948	14,948	0
Measured at fair value on a recurring basis: | U.S. Treasury | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4,948	14,948	0
Measured at fair value on a recurring basis: | U.S. Treasury | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | U.S. Treasury | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	74,862	74,222	49,637
Measured at fair value on a recurring basis: | U.S. government agencies | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | U.S. government agencies | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	74,862	74,222	49,637
Measured at fair value on a recurring basis: | U.S. government agencies | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Mortgage loans held-for-sale	44,250
Measured at fair value on a recurring basis: | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	160,386	168,655	155,489
Measured at fair value on a recurring basis: | Municipal securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | Municipal securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	48,129	51,118	55,088
Measured at fair value on a recurring basis: | Municipal securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	112,257	117,537	100,401
Measured at fair value on a recurring basis: | Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	83,675	85,705	82,939
Measured at fair value on a recurring basis: | Corporate notes | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | Corporate notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	83,675	85,705	82,939
Measured at fair value on a recurring basis: | Corporate notes | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | Mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,935,974	2,899,487	2,710,833
Measured at fair value on a recurring basis: | Mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0	0
Measured at fair value on a recurring basis: | Mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,935,974	2,899,487	2,710,833
Measured at fair value on a recurring basis: | Mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	$ 0	$ 0

Fair Values of Assets and Lia_5

Fair Values of Assets and Liabilities (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Mortgage loans held-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 48,655	$ 0
Net income	466	0
Other comprehensive income or loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	(18,619)	0
Net transfers into Level 3	13,748	0
Ending balance	44,250	0
Loans held-for- investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	84,165	15,891
Net income	364	(772)
Other comprehensive income or loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	(20,322)	(1,667)
Net transfers into Level 3	5,286	31,012
Ending balance	69,493	44,464
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	230,225	147,571
Net income	(5,755)	51,575
Other comprehensive income or loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Net transfers into Level 3	0	0
Ending balance	224,470	199,146
Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,711	10,560
Net income	3,645	(7,113)
Other comprehensive income or loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Net transfers into Level 3	0	0
Ending balance	5,356	3,447
Municipal securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	117,537	105,687
Net income	0	0
Other comprehensive income or loss	(1,662)	(5,449)
Purchases	4,418	1,246
Issuances	0	0
Sales	0	0
Settlements	(8,036)	(1,083)
Net transfers into Level 3	0	0
Ending balance	112,257	100,401
U.S. government agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Net income	0	0
Other comprehensive income or loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Net transfers into Level 3	0	0
Ending balance	$ 0	$ 0

Fair Values of Assets and Lia_6

Fair Values of Assets and Liabilities (Summary of Assets Measured at Fair Value on a Nonrecurring Basis) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	$ 71,622	$ 72,846
Fair value losses - individually assessed loans - foreclosure probable and collateral-dependent	2,501
Fair value losses - other real estate owned	104
Fair value losses	2,605
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,600
Measured at fair value on a non-recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,622
Other real estate owned	9,361
Total	80,983
Measured at fair value on a non-recurring basis: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	0
Other real estate owned	0
Total	0
Measured at fair value on a non-recurring basis: | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	0
Other real estate owned	0
Total	0
Measured at fair value on a non-recurring basis: | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,622
Other real estate owned	9,361
Total	$ 80,983

Fair Values of Assets and Lia_7

Fair Values of Assets and Liabilities (Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non-Recurring) (Detail)	Mar. 31, 2023 USD ($) year $ / shares	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	$ 3,259,845,000	$ 3,243,017,000	$ 2,998,898,000
Loans held-for-investment	207,532,000		57,984,000
MSRs	224,470,000	230,225,000	199,146,000	$ 147,571,000
Individually assessed loans - foreclosure probable and collateral-dependent	71,622,000		72,846,000
Municipal securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	160,386,000	168,655,000	155,489,000
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,600,000
Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale	302,493,000	299,935,000	606,545,000
Loans held-for-investment	202,143,000	179,932,000	57,984,000
MSRs	224,470,000	230,225,000	199,146,000
Derivative assets	274,004,000	296,848,000	153,534,000
Measured at fair value on a recurring basis: | Municipal securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	160,386,000	168,655,000	155,489,000
Measured at fair value on a recurring basis: | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale	44,250,000	48,655,000	0
Loans held-for-investment	69,493,000	84,165,000	44,464,000
MSRs	224,470,000	230,225,000	199,146,000
Derivative assets	5,356,000	1,711,000	3,447,000
Measured at fair value on a recurring basis: | Level 3 | Municipal securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	$ 112,257,000	$ 117,537,000	$ 100,401,000
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale, measurement input	0.0596
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.0596
MSRs, measurement input	0.03
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.0625
MSRs, measurement input	0.33
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale, measurement input	0.0596
Loans held-for-investment, measurement input	0.0598
MSRs, measurement input	0.1033
Measured at fair value on a recurring basis: | Credit discount | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale, measurement input	0
Loans held-for-investment, measurement input	0
Measured at fair value on a recurring basis: | Credit discount | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale, measurement input	0.10
Loans held-for-investment, measurement input	0.13
Measured at fair value on a recurring basis: | Credit discount | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale, measurement input	0.0022
Loans held-for-investment, measurement input	0.0086
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.0692
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	0
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	1
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.0692
MSRs, measurement input	0.0692
Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input | year	1.2
Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input | year	10.2
Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input | year	5.4
Measured at fair value on a recurring basis: | Cost of servicing | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input | $ / shares	70
Measured at fair value on a recurring basis: | Cost of servicing | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input | $ / shares	200
Measured at fair value on a recurring basis: | Cost of servicing | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	76
Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input | $ / shares	200
Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input | $ / shares	1,000
Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	403
Measured at fair value on a recurring basis: | Pull-through rate | Level 3 | Discounted cash flows | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, measurement input	0.31
Measured at fair value on a recurring basis: | Pull-through rate | Level 3 | Discounted cash flows | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, measurement input	1
Measured at fair value on a recurring basis: | Pull-through rate | Level 3 | Discounted cash flows | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, measurement input	0.8206
Measured at fair value on a non-recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	$ 71,622,000
Other real estate owned	9,361,000
Measured at fair value on a non-recurring basis: | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	71,622,000
Other real estate owned	$ 9,361,000
Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | Level 3 | Appraisal value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans - collateral based, measurement input	0.10
Other real estate owned, measurement input	0.10
Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | Level 3 | Appraisal value | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans - collateral based, measurement input	0.1000
Other real estate owned, measurement input	0.1000

Fair Values of Assets and Lia_8

Fair Values of Assets and Liabilities (Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Financial Assets:
Interest-bearing deposits with banks	$ 1,563,578	$ 1,988,719	$ 4,013,597
Available-for-sale securities	3,259,845	3,243,017	2,998,898
Held-to-maturity securities	2,976,198	2,949,821	3,146,427
Equity securities with readily determinable fair value	111,943	110,365	92,689
FHLB and FRB stock, at cost	244,957	224,759	136,163
Brokerage customer receivables	16,042	16,387	22,888
Mortgage loans held-for-sale, at fair value	302,493	299,935	606,545
Accrued interest receivable and other	1,413,795	1,391,342	1,066,750
Financial Liabilities
FHLB advances	2,316,071	2,316,071	1,241,071
Other borrowings	583,548	596,614	482,516
Subordinated notes	437,493	437,392	437,033
Junior subordinated debentures	253,566	253,566	253,566
Carrying Value
Financial Assets:
Cash and cash equivalents	445,986	490,966	462,572
Securities sold under agreements to repurchase with original maturities exceeding three months	0	0	700,000
Interest-bearing deposits with banks	1,563,578	1,988,719	4,013,597
Available-for-sale securities	3,259,845	3,243,017	2,998,898
Held-to-maturity securities	3,606,391	3,640,567	3,435,729
Trading account securities	102	1,127	852
Equity securities with readily determinable fair value	111,943	110,365	92,689
FHLB and FRB stock, at cost	244,957	224,759	136,163
Brokerage customer receivables	16,042	16,387	22,888
Mortgage loans held-for-sale, at fair value	302,493	299,935	606,545
Nonqualified deferred compensation assets	14,379	13,899	15,447
Derivative assets	274,004	296,848	153,534
Accrued interest receivable and other	417,066	379,719	278,873
Total	49,822,257	49,902,793	48,198,334
Financial Liabilities
Non-maturity deposits	37,366,959	38,167,409	38,483,327
Deposits with stated maturities	5,351,252	4,735,135	3,735,995
FHLB advances	2,316,071	2,316,071	1,241,071
Other borrowings	583,548	596,614	482,516
Subordinated notes	437,493	437,392	437,033
Junior subordinated debentures	253,566	253,566	253,566
Derivative liabilities	274,432	338,078	122,107
Accrued interest payable	42,015	22,176	14,269
Total financial liabilities	46,625,336	46,866,441	44,769,884
Carrying Value | Loans held-for-investment, at fair value
Financial Assets:
Loans held-for-investment	202,143	179,932	57,984
Carrying Value | Loans held-for-investment, at amortized cost
Financial Assets:
Loans held-for-investment	39,363,328	39,016,553	35,222,563
Fair Value
Financial Assets:
Cash and cash equivalents	445,986	490,966	462,572
Securities sold under agreements to repurchase with original maturities exceeding three months	0	0	700,000
Interest-bearing deposits with banks	1,563,578	1,988,719	4,013,597
Available-for-sale securities	3,259,845	3,243,017	2,998,898
Held-to-maturity securities	2,976,198	2,949,821	3,146,427
Trading account securities	102	1,127	852
Equity securities with readily determinable fair value	111,943	110,365	92,689
FHLB and FRB stock, at cost	244,957	224,759	136,163
Brokerage customer receivables	16,042	16,387	22,888
Mortgage loans held-for-sale, at fair value	302,493	299,935	606,545
Nonqualified deferred compensation assets	14,379	13,899	15,447
Derivative assets	274,004	296,848	153,534
Accrued interest receivable and other	417,066	379,719	278,873
Total	48,406,497	48,214,172	48,676,309
Financial Liabilities
Non-maturity deposits	37,366,959	38,167,409	38,483,327
Deposits with stated maturities	4,970,556	4,085,058	3,735,750
FHLB advances	2,255,580	2,219,983	1,193,080
Other borrowings	555,615	569,342	483,202
Subordinated notes	410,827	409,395	446,711
Junior subordinated debentures	252,663	253,405	268,913
Derivative liabilities	274,432	338,078	122,107
Accrued interest payable	42,015	22,176	14,269
Total financial liabilities	46,128,647	46,064,846	44,747,359
Fair Value | Loans held-for-investment, at fair value
Financial Assets:
Loans held-for-investment	202,143	179,932	57,984
Fair Value | Loans held-for-investment, at amortized cost
Financial Assets:
Loans held-for-investment	$ 38,577,761	$ 38,018,678	$ 35,989,840

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Shares available for future grants (in shares)	1.2
Stock-based compensation expense	$ 8.3	$ 7.9
Aggregate intrinsic value of options exercised	2.5	4.5
Cash received from option exercises	$ 2.2	$ 3.4

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans (Summary of Stock Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Common Shares
Outstanding at beginning of the period (in shares)	68,093	193,447
Granted (in shares)	0	0
Exercised (in shares)	(54,218)	(79,376)
Forfeited or canceled (in shares)	0	(771)
Outstanding at end of the period (in shares)	13,875	113,300
Exercisable (in shares)	13,875	113,300
Weighted Average Strike Price
Outstanding at beginning of period (usd per share)	$ 41.14	$ 41.62
Granted (usd per share)	0	0
Exercised (usd per share)	40.87	42.32
Forfeited or canceled (usd per share)	0	40.87
Outstanding at end of period (usd per share)	42.18	41.13
Exercisable (usd per share)	$ 42.18	$ 41.13
Stock Options Additional Disclosures
Remaining contractual term, outstanding	4 years 8 months 12 days	1 year 4 months 24 days
Remaining contractual term, exercisable	4 years 8 months 12 days	1 year 4 months 24 days
Intrinsic value, outstanding	$ 427	$ 5,869
Intrinsic value, exercisable	$ 427	$ 5,869

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans (Summary of Plans' Restricted and Performance Share Award Activity) (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Restricted shares
Common Shares
Outstanding, beginning of the period (in shares)	610,155	476,813
Granted (in shares)	242,576	194,849
Vested and issued (in shares)	(96,649)	(52,465)
Expired, canceled or forfeited (in shares)	(1,968)	(3,615)
Outstanding, end of the period (in shares)	754,114	615,582
Vested, but deferred (in shares)	97,888	95,806
Weighted Average Grant-Date Fair Value
Outstanding, beginning of period (usd per share)	$ 73.21	$ 61.33
Granted (usd per share)	89.82	97.30
Vested and issued (usd per share)	64.14	65.42
Canceled or forfeited (usd per share)	77.37	66.37
Outstanding, end of period (usd per share)	79.70	72.34
Vested, but deferred (usd per share)	$ 53.30	$ 52.67
Performance-based stock
Common Shares
Outstanding, beginning of the period (in shares)	545,379	557,255
Granted (in shares)	185,514	159,202
Added by performance factor at vesting (in shares)	23,161	0
Vested and issued (in shares)	(178,203)	0
Expired, canceled or forfeited (in shares)	(2,301)	(159,952)
Outstanding, end of the period (in shares)	573,550	556,505
Vested, but deferred (in shares)	35,852	35,285
Weighted Average Grant-Date Fair Value
Outstanding, beginning of period (usd per share)	$ 70.30	$ 62.94
Granted (usd per share)	92.48	97.21
Added by performance factor at vesting (usd per share)	63.64	0
Vested and issued (usd per share)	63.64	0
Canceled or forfeited (usd per share)	78.20	71.56
Outstanding, end of period (usd per share)	79.24	70.27
Vested, but deferred (usd per share)	$ 44.59	$ 43.88

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Components Of Other Comprehensive Income or Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 4,796,838	$ 4,498,688
Other comprehensive income during the period, net of tax, before reclassifications	58,021	(123,803)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax	2,211	3,743
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	(32)	(31)
Total other comprehensive income (loss)	60,200	(120,091)
Ending balance	5,015,506	4,492,256
Accumulated Unrealized (Losses) Gains on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(386,057)	8,724
Other comprehensive income during the period, net of tax, before reclassifications	34,503	(151,114)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax	(409)	(183)
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	(32)	(31)
Total other comprehensive income (loss)	34,062	(151,328)
Ending balance	(351,995)	(142,604)
Accumulated Unrealized Gains (Losses) on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	7,381	27,111
Other comprehensive income during the period, net of tax, before reclassifications	22,808	25,023
Amount reclassified from accumulated other comprehensive loss into net income, net of tax	2,620	3,926
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	0	0
Total other comprehensive income (loss)	25,428	28,949
Ending balance	32,809	56,060
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(48,960)	(31,743)
Other comprehensive income during the period, net of tax, before reclassifications	710	2,288
Amount reclassified from accumulated other comprehensive loss into net income, net of tax	0	0
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	0	0
Total other comprehensive income (loss)	710	2,288
Ending balance	(48,250)	(29,455)
Accumulated other comprehensive income (loss)
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(427,636)	4,092
Ending balance	$ (367,436)	$ (115,999)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Other Comprehensive Income Reclassified from AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains (losses) on investment securities, net	$ 560	$ 250
Income tax expense	63,352	46,289
Interest on deposits	144,802	14,854
Net income	180,198	127,391
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains (losses) on investment securities, net	560	250
Income before taxes	560	250
Income tax expense	(151)	(67)
Net income	409	183
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized gains on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes	(3,572)	(5,353)
Income tax expense	952	1,427
Interest on Loans	9,072	0
Interest on deposits	(5,588)	4,819
Interest on other borrowings	88	534
Net income	$ (2,620)	$ (3,926)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Equity [Abstract]
Net income	$ 180,198	$ 127,391
Less: Preferred stock dividends	6,991	6,991
Net income applicable to common shares	$ 173,207	$ 120,400
Weighted average common shares outstanding (in shares)	60,950	57,196
Effect of dilutive potential common shares
Common stock equivalents (in shares)	873	862
Weighted average common shares and effect of dilutive potential common shares (in shares)	61,823	58,058
Net income per common share:
Basic (usd per share)	$ 2.84	$ 2.11
Diluted (usd per share)	$ 2.80	$ 2.07

Accumulated Other Comprehensi_6

Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Narrative) (Detail) - $ / shares	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2023
Class of Stock [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.40	$ 0.40	$ 0.34
Forecast
Class of Stock [Line Items]
Cash dividends declared per common share (usd per share)				$ 1.60