Wintrust Financial (WTFC) 10-Q 8 Aug 24 2024 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2024	Aug. 06, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
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)		66,500,386
Entity Central Index Key	0001015328
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
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	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Assets
Cash and due from banks	$ 415,462	$ 423,404	$ 513,858
Federal funds sold and securities purchased under resale agreements	62	60	59
Interest-bearing deposits with banks	2,824,314	2,084,323	2,163,708
Available-for-sale securities, at fair value	4,329,957	3,502,915	3,492,481
Held-to-maturity securities, at amortized cost, net of allowance for credit losses of $491, $347 and $406 at June 30, 2024, December 31, 2023 and June 30, 2023, respectively ($3.1 billion, $3.2 billion and $2.9 billion fair value at June 30, 2024, December 31, 2023 and June 30, 2023, respectively)	3,755,924	3,856,916	3,564,473
Trading account securities	4,134	4,707	3,027
Equity securities with readily determinable fair value	112,173	139,268	116,275
Federal Home Loan Bank and Federal Reserve Bank stock	256,495	205,003	195,117
Brokerage customer receivables	13,682	10,592	15,722
Mortgage loans held-for-sale, at fair value	411,851	292,722	338,728
Loans, net of unearned income	44,675,531	42,131,831	41,023,408
Allowance for loan losses	(437,069)	(427,265)	(387,380)
Premises, software and equipment, net	722,295	748,966	749,393
Lease investments, net	275,459	281,280	274,351
Accrued interest receivable and other assets	1,671,334	1,551,899	1,455,748
Trade date securities receivable	0	690,722	0
Goodwill	655,955	656,672	656,674
Other acquisition-related intangible assets	20,607	22,889	25,653
Total assets	59,781,516	56,259,934	54,286,176
Deposits:
Non-interest-bearing	10,031,440	10,420,401	10,604,915
Interest-bearing	38,017,586	34,976,769	33,433,792
Total deposits	48,049,026	45,397,170	44,038,707
Federal Home Loan Bank advances	3,176,309	2,326,071	2,026,071
Other borrowings	606,579	645,813	665,219
Subordinated notes	298,113	437,866	437,628
Junior subordinated debentures	253,566	253,566	253,566
Accrued interest payable and other liabilities	1,861,295	1,799,922	1,823,073
Total liabilities	54,244,888	50,860,408	49,244,264
Shareholders’ Equity:
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at June 30, 2024, December 31, 2023 and June 30, 2023; 61,824,947 shares issued at June 30, 2024, 61,268,566 shares issued at December 31, 2023 and 61,219,240 shares issued at June 30, 2023	61,825	61,269	61,219
Surplus	1,964,645	1,943,806	1,923,623
Treasury stock, at cost, $64,808 shares at June 30, 2024, 24,940 shares at December 31, 2023, and 21,564 shares at June 30, 2023	(5,760)	(2,217)	(1,966)
Retained earnings	3,615,616	3,345,399	3,120,626
Accumulated other comprehensive loss	(512,198)	(361,231)	(474,090)
Total shareholders’ equity	5,536,628	5,399,526	5,041,912
Total liabilities and shareholders’ equity	59,781,516	56,259,934	54,286,176
Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at June 30, 2024, December 31, 2023 and June 30, 2023
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 June 30, 2024, December 31, 2023 and June 30, 2023
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	44,675,531	42,131,831	41,023,408
Allowance for loan losses	(363,719)	(344,235)	(302,499)
Net loans	$ 44,311,812	$ 41,787,596	$ 40,720,909

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Held-to-maturity securities, allowance for credit loss	$ 491	$ 347	$ 406
Held-to-maturity securities, fair value	$ 3,060,467	$ 3,215,468	$ 2,887,891
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)	61,824,947	61,268,566	61,219,240
Treasury stock (in shares)	64,808	24,940	21,564
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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income
Interest and fees on loans	$ 749,812	$ 621,057	$ 1,460,153	$ 1,179,749
Mortgage loans held-for-sale	5,434	4,178	9,580	7,706
Interest-bearing deposits with banks	19,731	16,882	36,389	30,350
Federal funds sold and securities purchased under resale agreements	17	1	36	71
Investment securities	69,779	51,243	139,457	111,186
Trading account securities	13	6	31	20
Federal Home Loan Bank and Federal Reserve Bank stock	4,974	3,544	9,452	7,224
Brokerage customer receivables	219	265	394	560
Total interest income	849,979	697,176	1,655,492	1,336,866
Interest expense
Interest on deposits	335,703	213,495	635,235	358,297
Interest on Federal Home Loan Bank advances	24,797	17,399	46,845	36,534
Interest on other borrowings	8,700	8,485	17,948	16,339
Interest on subordinated notes	5,185	5,523	10,672	11,011
Interest on junior subordinated debentures	4,984	4,737	9,988	9,153
Total interest expense	379,369	249,639	720,688	431,334
Net interest income	470,610	447,537	934,804	905,532
Provision for credit losses	40,061	28,514	61,734	51,559
Net interest income after provision for credit losses	430,549	419,023	873,070	853,973
Non-interest income
Wealth management	35,413	33,858	70,228	63,803
Mortgage banking	29,124	29,981	56,787	48,245
Service charges on deposit accounts	15,546	13,608	30,357	26,511
(Losses) gains on investment securities, net	(4,282)	0	(2,956)	1,398
Fees from covered call options	2,056	2,578	6,903	12,969
Trading gains, net	70	106	747	919
Operating lease income, net	13,938	12,227	28,048	25,273
Other	29,282	20,672	71,613	41,681
Total non-interest income	121,147	113,030	261,727	220,799
Non-interest expense
Salaries and employee benefits	198,541	184,923	393,714	361,704
Software and equipment	29,231	26,205	56,962	50,902
Operating lease equipment	10,834	9,816	21,517	19,649
Occupancy, net	19,585	19,176	38,671	37,662
Data processing	9,503	9,726	18,795	19,135
Advertising and marketing	17,436	17,794	30,476	29,740
Professional fees	9,967	8,940	19,520	17,103
Amortization of other acquisition-related intangible assets	1,122	1,499	2,280	2,734
FDIC insurance	10,429	9,008	24,966	17,677
Other real estate owned expense, net	(259)	118	133	(89)
Other	33,964	33,418	66,464	63,575
Total non-interest expense	340,353	320,623	673,498	619,792
Income before taxes	211,343	211,430	461,299	454,980
Income tax expense	58,955	56,680	121,617	120,032
Net income	152,388	154,750	339,682	334,948
Preferred stock dividends	6,991	6,991	13,982	13,982
Net income applicable to common shares	$ 145,397	$ 147,759	$ 325,700	$ 320,966
Net income per common share-Basic (usd per share)	$ 2.35	$ 2.41	$ 5.28	$ 5.26
Net income per common share-Diluted (usd per share)	2.32	2.38	5.21	5.18
Cash dividends declared per common share (usd per share)	$ 0.45	$ 0.40	$ 0.90	$ 0.80
Weighted average common shares outstanding (in shares)	61,839	61,192	61,660	61,072
Dilutive potential common shares (in shares)	926	902	901	933
Average common shares and dilutive common shares (in shares)	62,765	62,094	62,561	62,005

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 152,388	$ 154,750	$ 339,682	$ 334,948
Unrealized (losses) gains on available-for-sale securities
Before tax	(20,768)	(46,231)	(98,656)	809
Tax effect	5,493	12,322	26,094	(215)
Net of tax	(15,275)	(33,909)	(72,562)	594
Reclassification of net gains on available-for-sale securities included in net income
Before tax	1,204	2	1,178	562
Tax effect	(319)	(1)	(312)	(152)
Net of tax	885	1	866	410
Reclassification of amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale
Before tax	14	28	64	71
Tax effect	(4)	(8)	(17)	(19)
Net of tax	10	20	47	52
Net unrealized (losses) gains on available-for-sale securities	(16,170)	(33,930)	(73,475)	132
Unrealized (losses) gains on derivative instruments
Before tax	(10,843)	(106,431)	(92,934)	(71,765)
Tax effect	2,868	28,363	24,581	19,125
Net unrealized (losses) gains on derivative instruments	(7,975)	(78,068)	(68,353)	(52,640)
Foreign currency adjustment
Before tax	(3,558)	6,527	(11,207)	7,417
Tax effect	653	(1,183)	2,068	(1,363)
Net foreign currency adjustment	(2,905)	5,344	(9,139)	6,054
Total other comprehensive (loss) income	(27,050)	(106,654)	(150,967)	(46,454)
Comprehensive income	$ 125,338	$ 48,096	$ 188,715	$ 288,494

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, 2022	$ 4,796,838	$ (544)	$ 412,500	$ 60,797	$ 1,902,474	$ (304)	$ 2,849,007	$ (544)	$ (427,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	334,948						334,948
Other comprehensive loss, net of tax	(46,454)								(46,454)
Cash dividends declared on common stock	(48,803)						(48,803)
Dividends on Series D and E preferred stock	(13,982)						(13,982)
Stock-based compensation	16,403				16,403
Common stock issued for:
Exercise of stock options	2,216			54	2,162
Restricted stock awards	(1,662)			283	(283)	(1,662)
Employee stock purchase plan	1,601			22	1,579
Director compensation plan	1,351			63	1,288
Ending balance at Jun. 30, 2023	5,041,912		412,500	61,219	1,923,623	(1,966)	3,120,626		(474,090)
Beginning balance at Mar. 31, 2023	5,015,506		412,500	61,198	1,913,947	(1,966)	2,997,263		(367,436)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	154,750						154,750
Other comprehensive loss, net of tax	(106,654)								(106,654)
Cash dividends declared on common stock	(24,396)						(24,396)
Dividends on Series D and E preferred stock	(6,991)						(6,991)
Stock-based compensation	8,108				8,108
Common stock issued for:
Restricted stock awards	0			8	(8)
Employee stock purchase plan	907			13	894
Director compensation plan	682				682
Ending balance at Jun. 30, 2023	5,041,912		412,500	61,219	1,923,623	(1,966)	3,120,626		(474,090)
Beginning balance at Dec. 31, 2023	5,399,526		412,500	61,269	1,943,806	(2,217)	3,345,399		(361,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	339,682						339,682
Other comprehensive loss, net of tax	(150,967)								(150,967)
Cash dividends declared on common stock	(55,483)						(55,483)
Dividends on Series D and E preferred stock	(13,982)						(13,982)
Stock-based compensation	18,107				18,107
Common stock issued for:
Exercise of stock options	25			1	24
Restricted stock awards	(3,539)			523	(519)	(3,543)
Employee stock purchase plan	1,643			17	1,626
Director compensation plan	1,616			15	1,601
Ending balance at Jun. 30, 2024	5,536,628		412,500	61,825	1,964,645	(5,760)	3,615,616		(512,198)
Beginning balance at Mar. 31, 2024	5,436,400		412,500	61,798	1,954,532	(5,757)	3,498,475		(485,148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	152,388						152,388
Other comprehensive loss, net of tax	(27,050)								(27,050)
Cash dividends declared on common stock	(28,256)						(28,256)
Dividends on Series D and E preferred stock	(6,991)						(6,991)
Stock-based compensation	8,950				8,950
Common stock issued for:
Restricted stock awards	(35)			18	(50)	(3)
Employee stock purchase plan	902			9	893
Director compensation plan	320				320
Ending balance at Jun. 30, 2024	$ 5,536,628		$ 412,500	$ 61,825	$ 1,964,645	$ (5,760)	$ 3,615,616		$ (512,198)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cash dividends declared on common stock (usd per share)	$ 0.45	$ 0.40	$ 0.90	$ 0.80
Series D Preferred Stock
Dividends on preferred stock (usd per share)	0.41	0.41	0.82	0.82
Series E Preferred Stock
Dividends on preferred stock (usd per share)	$ 429.69	$ 429.69	$ 859.38	$ 859.38

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating Activities:
Net income	$ 339,682	$ 334,948
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	61,734	51,559
Depreciation, amortization and accretion, net	45,142	34,997
Stock-based compensation expense	18,107	16,403
(Accretion) amortization of discount/premium on securities, net	(347)	743
Accretion of discount and deferred fees on loans, net	(7,127)	(9,067)
Mortgage servicing rights fair value changes	1,448	13,190
Non-designated derivatives fair value changes, net	(9,566)	(2,088)
Originations and purchases of mortgage loans held-for-sale	(1,197,799)	(980,276)
Early buy-out exercises of mortgage loans held-for-sale guaranteed by U.S. government agencies, net of subsequent paydowns or payoffs	(3,896)	29,890
Proceeds from sales of mortgage loans held-for-sale	1,083,551	900,046
Bank owned life insurance (“BOLI”) gains	(3,002)	(2,673)
Decrease (increase) in trading securities, net	573	(1,900)
(Increase) decrease in brokerage customer receivables, net	(3,090)	665
Gains on mortgage loans sold	(25,640)	(24,133)
Gains on premium financing receivables sold	(4,575)	0
Losses (gains) on investment securities, net	2,956	(1,398)
(Gains) losses on sales of premises and equipment, net	(112)	1,594
(Gains) losses on sales and fair value adjustments of other real estate owned, net	(316)	100
Increase in accrued interest receivable and other assets, net	(88,565)	(83,646)
Increase in accrued interest payable and other liabilities, net	83,207	129,238
Net Cash Provided by Operating Activities	292,365	408,192
Investing Activities:
Proceeds from calls and sales of available-for-sale securities	690,866	1,875,672
Proceeds from payments and maturities of available-for-sale securities	193,605	156,892
Proceeds from payments, maturities and calls of held-to-maturity securities	100,276	84,015
Proceeds from sales of equity securities with readily determinable fair value	51,792	23,592
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	2,226	67
Purchases of available-for-sale securities	(1,118,596)	(1,359,722)
Purchases of held-to-maturity securities	0	(8,439)
Purchases of equity securities with readily determinable fair value	(24,000)	(26,677)
Purchases of equity securities without readily determinable fair value	(5,972)	(5,600)
(Purchases) redemptions of Federal Home Loan Bank and Federal Reserve Bank stock, net	(51,492)	29,642
Distributions from investments in partnerships, net	2,239	4,995
Net cash paid in business combinations	0	(4,966)
Proceeds from sales of premium financing receivables, net	627,450	0
Proceeds from sales of other real estate owned	1,752	1,168
Increase in interest-bearing deposits with banks, net	(743,606)	(172,149)
Increase in loans, net	(3,241,661)	(1,820,788)
Redemption of BOLI	306	0
Purchases of premises and equipment, net	(49,759)	(9,318)
Net Cash Used for Investing Activities	(3,564,574)	(1,231,616)
Financing Activities:
Increase in deposit accounts, net	2,651,854	1,136,159
(Decrease) increase in other borrowings, net	(28,103)	59,552
Increase (decrease) in Federal Home Loan Bank advances, net	850,238	(290,000)
Cash payments to settle contingent consideration liabilities recognized in business combinations	0	(57)
Repayment of subordinated notes	(140,000)	0
Issuance of common shares resulting from the exercise of stock options, employee stock purchase plan and director compensation plan	3,284	5,168
Common stock repurchases for tax withholdings related to stock-based compensation	(3,539)	(1,662)
Dividends paid	(69,465)	(62,785)
Net Cash Provided by Financing Activities	3,264,269	846,375
Net (Decrease) Increase in Cash and Cash Equivalents	(7,940)	22,951
Cash and Cash Equivalents at Beginning of Period	423,464	490,966
Cash and Cash Equivalents at End of Period	$ 415,524	$ 513,917

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2024
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, 2023 (“2023 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 2023 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	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Recent Accounting Developments	Recent Accounting Developments Equity Method and Joint Ventures - Investments in Tax Credit Structures In March 2023, the FASB issued ASU No. 2023-02, “Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method,” which allows reporting entities the option to apply the proportional amortization method to other tax credit programs besides the Low-Income Housing Tax Credit structures. The guidance requires application of the proportional amortization method on a tax-credit-program-by-tax-credit-program basis rather than electing the method at the reporting level entity level. The Company adopted ASU No. 2023-02 as of January 1, 2024. Adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Segment Reporting In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” to enhance public entity disclosures regarding significant segment expenses which are regularly reported to an entity’s chief operating decision-maker (“CODM”) and included in a segment’s reported profit or loss. This ASU requires disclosure of the amount and composition of “other segment items,” the title and position of the CODM, and how the CODM uses reported measures of profit or loss to assess segment performance. Further, the guidance requires certain segment disclosures previously provided only annually, on an interim basis. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The guidance is to be applied retrospectively. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements. Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” to enhance the transparency and decision usefulness of income tax disclosures. This ASU requires annually that all entities disclose increasingly disaggregated information on amount of income taxes paid. Further, this ASU requires annually that all public entities must disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a specific quantitative threshold. This guidance is effective for fiscal years beginning after December 15, 2024, and is to be applied either on a prospective basis or retrospective basis. Early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements. Compensation – Scope Application of Profits Interest and Similar Awards In March 2024, the FASB issued ASU No. 2024-01, “Compensation – Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards” which clarifies the guidance by providing an illustrative example to demonstrate how an entity should apply the scope guidance in Topic 718 when determining whether profits interest and similar awards should be accounted for in accordance with Topic 718. For public business entities, this guidance is effective for fiscal years beginning after December 15, 2024, including interim periods therein, and is to be applied either on a prospective basis or retrospective basis. Early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Business Combinations	Business Combinations On April 3, 2023, the Company completed its acquisition of Rothschild & Co Asset Management US Inc. and Rothschild & Co Risk Based Investments LLC from Rothschild & Co North America Inc. As of the acquisition date, the Company acquired approximately $12.6 million in net assets. As the transaction was determined to be a business combination, the Company recorded goodwill of approximately $2.6 million on the purchase.

Cash and Cash Equivalents

Cash and Cash Equivalents	6 Months Ended
	Jun. 30, 2024
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	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

Investment Securities	6 Months Ended
	Jun. 30, 2024
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: June 30, 2024 (In thousands) Amortized Gross Gross Fair Available-for-sale securities U.S. Treasury $ 102,721 $ 5 $ (14) $ 102,712 U.S. government agencies 50,000 — (4,808) 45,192 Municipal 151,347 390 (5,129) 146,608 Corporate notes: Financial issuers 83,996 — (7,011) 76,985 Other 1,000 — (10) 990 Mortgage-backed: (1) Residential mortgage-backed securities 4,320,215 361 (541,742) 3,778,834 Commercial (multi-family) mortgage-backed securities 18,096 8 (626) 17,478 Collateralized mortgage obligations 179,315 629 (18,786) 161,158 Total available-for-sale securities $ 4,906,690 $ 1,393 $ (578,126) $ 4,329,957 Held-to-maturity securities U.S. government agencies $ 336,458 $ — $ (70,928) $ 265,530 Municipal 166,400 155 (6,789) 159,766 Mortgage-backed: (1) Residential mortgage-backed securities 2,962,721 — (591,601) 2,371,120 Commercial (multi-family) mortgage-backed securities 6,390 — (300) 6,090 Collateralized mortgage obligations 227,247 362 (23,636) 203,973 Corporate notes 57,199 — (3,211) 53,988 Total held-to-maturity securities $ 3,756,415 $ 517 $ (696,465) $ 3,060,467 Less: Allowance for credit losses (491) Held-to-maturity securities, net of allowance for credit losses $ 3,755,924 Equity securities with readily determinable fair value $ 117,674 $ 2,882 $ (8,383) $ 112,173 (1) None of our mortgage-backed securities are subprime. December 31, 2023 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ 6,960 $ 8 $ — $ 6,968 U.S. government agencies 50,000 — (4,876) 45,124 Municipal 144,299 657 (3,998) 140,958 Corporate notes: Financial issuers 83,996 — (8,456) 75,540 Other 1,000 — (9) 991 Mortgage-backed: (1) Residential Mortgage-backed securities 3,505,012 1,392 (446,784) 3,059,620 Commercial (multi-family) mortgage-backed securities 13,201 68 (289) 12,980 Collateralized mortgage obligations 175,346 1,400 (16,012) 160,734 Total available-for-sale securities $ 3,979,814 $ 3,525 $ (480,424) $ 3,502,915 Held-to-maturity securities U.S. government agencies $ 336,468 $ — $ (67,058) $ 269,410 Municipal 172,933 565 (3,778) 169,720 Mortgage-backed: (1) Residential Mortgage-backed securities 3,042,828 1,922 (549,265) 2,495,485 Commercial (multi-family) mortgage-backed securities 6,415 — (184) 6,231 Collateralized mortgage obligations 241,075 978 (21,502) 220,551 Corporate notes 57,544 7 (3,480) 54,071 Total held-to-maturity securities $ 3,857,263 $ 3,472 $ (645,267) $ 3,215,468 Less: Allowance for credit losses (347) Held-to-maturity securities, net of allowance for credit losses $ 3,856,916 Equity securities with readily determinable fair value $ 143,312 $ 3,500 $ (7,544) $ 139,268 (1) None of our mortgage-backed securities are subprime. June 30, 2023 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 80,000 — (5,725) 74,275 Municipal 173,540 102 (6,231) 167,411 Corporate notes: Financial issuers 83,995 — (12,920) 71,075 Other 1,000 — (15) 985 Mortgage-backed: (1) Mortgage-backed securities 3,585,943 — (483,659) 3,102,284 Collateralized mortgage obligations 94,373 — (17,922) 76,451 Total available-for-sale securities $ 4,018,851 $ 102 $ (526,472) $ 3,492,481 Held-to-maturity securities U.S. government agencies $ 339,604 $ — $ (71,022) $ 268,582 Municipal 176,128 362 (4,502) 171,988 Mortgage-backed: (1) Mortgage-backed securities 2,832,138 — (574,114) 2,258,024 Collateralized mortgage obligations 159,120 — (23,014) 136,106 Corporate notes 57,889 35 (4,733) 53,191 Total held-to-maturity securities $ 3,564,879 $ 397 $ (677,385) $ 2,887,891 Less: Allowance for credit losses (406) Held-to-maturity securities, net of allowance for credit losses $ 3,564,473 Equity securities with readily determinable fair value $ 120,629 $ 3,711 $ (8,065) $ 116,275 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. Equity securities without readily determinable fair values totaled $62.7 million as of June 30, 2024. 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. During the three and six months ended June 30, 2024 and June 30, 2023, the Company recorded no upward or downward adjustments related to such observable price changes. 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 and six months ended June 30, 2024, the Company recorded $3.7 million of impairment of equity securities without readily determinable fair values. During the three and six months ended June 30, 2023, the Company recorded no 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 June 30, 2024: 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. Treasury $ 90,735 $ (14) $ — $ — $ 90,735 $ (14) U.S. government agencies — — 45,192 (4,808) 45,192 (4,808) Municipal 42,560 (333) 78,578 (4,796) 121,138 (5,129) Corporate notes: Financial issuers — — 76,985 (7,011) 76,985 (7,011) Other — — 990 (10) 990 (10) Mortgage-backed: (1) Residential mortgage-backed securities 1,226,130 (19,491) 2,537,424 (522,251) 3,763,554 (541,742) Commercial (multi-family) mortgage-backed securities 14,505 (626) — — 14,505 (626) Collateralized mortgage obligations 16,384 (81) 69,273 (18,705) 85,657 (18,786) Total available-for-sale securities $ 1,390,314 $ (20,545) $ 2,808,442 $ (557,581) $ 4,198,756 $ (578,126) (1) None of our mortgage-backed securities 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 June 30, 2024 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 June 30, 2024 were primarily mortgage-backed securities with unrealized losses due to increased market rates during such period. See Note (7) “Allowance for Credit Losses” in Item 1 of this report for further discussion regarding any credit losses associated with held-to-maturity securities at June 30, 2024. 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 June 30, Six months ended June 30, (In thousands) 2024 2023 2024 2023 Realized gains on investment securities $ 1,325 $ 6 $ 2,360 $ 611 Realized losses on investment securities (21) (6) (129) (51) Net realized gains on investment securities 1,304 0 2,231 560 Unrealized gains on equity securities with readily determinable fair value 74 684 1,108 2,974 Unrealized losses on equity securities with readily determinable fair value (1,931) (684) (2,564) (2,136) Net unrealized (losses) gains on equity securities with readily determinable fair value (1,857) 0 (1,456) 838 Impairment of equity securities without readily determinable fair values (3,729) — (3,731) — (Losses) gains on investment securities, net $ (4,282) $ 0 $ (2,956) $ 1,398 The amortized cost and fair value of available-for-sale and held-to-maturity investment securities as of June 30, 2024, December 31, 2023 and June 30, 2023, 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: June 30, 2024 December 31, 2023 June 30, 2023 (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities Due in one year or less $ 145,856 $ 145,599 $ 53,162 $ 52,945 $ 93,724 $ 93,137 Due in one to five years 139,409 131,506 132,348 123,985 138,704 126,776 Due in five to ten years 84,756 79,216 82,040 76,869 41,655 36,315 Due after ten years 19,043 16,166 18,705 15,782 64,452 57,518 Mortgage-backed 4,517,626 3,957,470 3,693,559 3,233,334 3,680,316 3,178,735 Total available-for-sale securities $ 4,906,690 $ 4,329,957 $ 3,979,814 $ 3,502,915 $ 4,018,851 $ 3,492,481 Held-to-maturity securities Due in one year or less $ 8,356 $ 8,213 $ 5,169 $ 5,142 $ 2,479 $ 2,475 Due in one to five years 114,457 109,845 109,602 105,835 102,182 96,806 Due in five to ten years 85,507 82,499 99,700 98,718 106,708 105,054 Due after ten years 351,737 278,727 352,474 283,506 362,252 289,426 Mortgage-backed 3,196,358 2,581,183 3,290,318 2,722,267 2,991,258 2,394,130 Total held-to-maturity securities $ 3,756,415 $ 3,060,467 $ 3,857,263 $ 3,215,468 $ 3,564,879 $ 2,887,891 Less: Allowance for credit losses (491) (347) (406) Held-to-maturity securities, net of allowance for credit losses $ 3,755,924 $ 3,856,916 $ 3,564,473 Securities having a carrying value of $7.6 billion at June 30, 2024 as well as securities having a carrying value of $6.9 billion and $6.4 billion at December 31, 2023 and June 30, 2023, respectively, were pledged as collateral for public deposits, trust deposits, Federal Home Loan Bank (“FHLB”) advances and available lines of credit, securities sold under repurchase agreements and derivatives. At June 30, 2024, there were no securities of a single issuer, other than U.S. government-sponsored agency securities, which exceeded 10% of shareholders’ equity.

Loans

Loans	6 Months Ended
	Jun. 30, 2024
Receivables [Abstract]
Loans	Loans The following table shows the Company’s loan portfolio by category as of the dates shown: June 30, December 31, June 30, (Dollars in thousands) 2024 2023 2023 Balance: Commercial $ 14,154,462 $ 12,832,053 $ 12,600,471 Commercial real estate 11,947,197 11,344,164 10,608,811 Home equity 356,313 343,976 336,974 Residential real estate 3,067,335 2,769,666 2,643,240 Premium finance receivables—property & casualty 7,100,753 6,903,529 6,762,698 Premium finance receivables—life insurance 7,962,115 7,877,943 8,039,273 Consumer and other 87,356 60,500 31,941 Total loans, net of unearned income $ 44,675,531 $ 42,131,831 $ 41,023,408 Mix: Commercial 31 % 30 % 31 % Commercial real estate 27 27 26 Home equity 1 1 1 Residential real estate 7 7 6 Premium finance receivables—property & casualty 16 16 16 Premium finance receivables—life insurance 18 19 20 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 franchise lending and insurance agency 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 $248.3 million at June 30, 2024, $285.4 million at December 31, 2023 and $281.7 million at June 30, 2023. Total loans, excluding purchased credit deteriorated (“PCD”) loans, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $89.6 million at June 30, 2024, $84.2 million at December 31, 2023 and $72.8 million at June 30, 2023. 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	6 Months Ended
	Jun. 30, 2024
Credit Loss [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses In 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 2023 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 June 30, 2024, December 31, 2023 and June 30, 2023: As of June 30, 2024 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 $ 51,087 $ 304 $ 16,485 $ 36,358 $ 14,050,228 $ 14,154,462 Commercial real estate Construction and development 2,528 — 1,699 6,539 2,249,785 2,260,551 Non-construction 45,761 — 4,856 31,526 9,604,503 9,686,646 Home equity 1,100 — 275 1,229 353,709 356,313 Residential real estate, excluding early buy-out loans 18,198 — 1,977 130 2,912,852 2,933,157 Premium finance receivables Property and casualty insurance loans 32,722 22,427 29,925 45,927 6,969,752 7,100,753 Life insurance loans — — 4,118 17,693 7,940,304 7,962,115 Consumer and other 3 121 81 366 86,785 87,356 Total loans, net of unearned income, excluding early buy-out loans $ 151,399 $ 22,852 $ 59,416 $ 139,768 $ 44,167,918 $ 44,541,353 Early buy-out loans guaranteed by U.S. government agencies (1) — 45,788 — — 88,390 134,178 Total loans, net of unearned income $ 151,399 $ 68,640 $ 59,416 $ 139,768 $ 44,256,308 $ 44,675,531 As of December 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 $ 38,940 $ 98 $ 19,488 $ 85,743 $ 12,687,784 $ 12,832,053 Commercial real estate Construction and development 2,205 — 251 1,343 2,080,242 2,084,041 Non-construction 33,254 — 8,264 19,291 9,199,314 9,260,123 Home equity 1,341 — 62 2,263 340,310 343,976 Residential real estate, excluding early buy-out loans 15,391 — 2,325 22,942 2,578,425 2,619,083 Premium finance receivables Property and casualty insurance loans 27,590 20,135 23,236 50,437 6,782,131 6,903,529 Life insurance loans — — 16,206 45,464 7,816,273 7,877,943 Consumer and other 22 54 25 165 60,234 60,500 Total loans, net of unearned income, excluding early buy-out loans $ 118,743 $ 20,287 $ 69,857 $ 227,648 $ 41,544,713 $ 41,981,248 Early buy-out loans guaranteed by U.S. government agencies (1) — 57,688 250 328 92,317 150,583 Total loans, net of unearned income $ 118,743 $ 77,975 $ 70,107 $ 227,976 $ 41,637,030 $ 42,131,831 (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 June 30, 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 $ 40,460 $ 573 $ 22,808 $ 48,970 $ 12,487,660 $ 12,600,471 Commercial real estate Construction and development 12,536 — — 766 1,747,134 1,760,436 Non-construction 5,947 — 1,054 13,452 8,827,922 8,848,375 Home equity 1,361 110 316 601 334,586 336,974 Residential real estate, excluding early buy-out loans 13,652 — 7,243 872 2,433,625 2,455,392 Premium finance receivables Property and casualty insurance loans 19,583 12,785 22,670 32,751 6,674,909 6,762,698 Life insurance loans 6 1,667 3,729 90,117 7,943,754 8,039,273 Consumer and other 4 28 51 146 31,712 31,941 Total loans, net of unearned income, excluding early buy-out loans $ 93,549 $ 15,163 $ 57,871 $ 187,675 $ 40,481,302 $ 40,835,560 Early buy-out loans guaranteed by U.S. government agencies (1) 117 57,728 918 — 129,085 187,848 Total loans, net of unearned income $ 93,666 $ 72,891 $ 58,789 $ 187,675 $ 40,610,387 $ 41,023,408 (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 2023 Form 10-K. The table below shows the Company’s loan portfolio by credit quality indicator and year of origination at June 30, 2024: Year of Origination Revolving Total (In thousands) 2024 2023 2022 2021 2020 Prior Revolving to Term Loans Loan Balances: Commercial, industrial and other Pass $ 1,759,369 $ 2,462,832 $ 1,847,769 $ 1,330,074 $ 529,579 $ 1,099,112 $ 4,405,035 $ 8,966 $ 13,442,736 Special mention 1,704 62,567 69,016 64,001 6,033 51,135 129,899 1,300 385,655 Substandard accrual 2,660 41,267 42,882 40,319 20,026 8,703 119,110 17 274,984 Substandard nonaccrual/doubtful — 5,950 5,718 21,951 1,237 8,175 7,976 80 51,087 Total commercial, industrial and other $ 1,763,733 $ 2,572,616 $ 1,965,385 $ 1,456,345 $ 556,875 $ 1,167,125 $ 4,662,020 $ 10,363 $ 14,154,462 Construction and development Pass $ 78,100 $ 475,118 $ 973,989 $ 371,090 $ 79,439 $ 159,686 $ 22,350 $ — $ 2,159,772 Special mention — 1,176 14,990 17,091 — 14,969 — — 48,226 Substandard accrual — — — 1,102 1,777 47,146 — — 50,025 Substandard nonaccrual/doubtful — 495 — — 2,033 — — — 2,528 Total construction and development $ 78,100 $ 476,789 $ 988,979 $ 389,283 $ 83,249 $ 221,801 $ 22,350 $ — $ 2,260,551 Non-construction Pass $ 710,843 $ 1,515,024 $ 1,757,491 $ 1,360,084 $ 961,509 $ 2,884,404 $ 198,713 $ 265 $ 9,388,333 Special mention 3,364 8,422 37,904 46,765 17,230 46,738 274 — 160,697 Substandard accrual — 3,202 13,696 9,545 22,983 42,429 — — 91,855 Substandard nonaccrual/doubtful — 1,372 453 170 — 43,766 — — 45,761 Total non-construction $ 714,207 $ 1,528,020 $ 1,809,544 $ 1,416,564 $ 1,001,722 $ 3,017,337 $ 198,987 $ 265 $ 9,686,646 Home equity Pass $ — $ — $ — $ — $ — $ 9,272 $ 326,705 $ 2,737 $ 338,714 Special mention — — 222 59 120 2,417 6,313 287 9,418 Substandard accrual — — 104 — 102 6,242 558 75 7,081 Substandard nonaccrual/doubtful — — 511 137 — 363 — 89 1,100 Total home equity $ — $ — $ 837 $ 196 $ 222 $ 18,294 $ 333,576 $ 3,188 $ 356,313 Residential real estate Early buy-out loans guaranteed by U.S. government agencies $ — $ 3,762 $ 3,381 $ 3,813 $ 5,700 $ 117,522 $ — $ — $ 134,178 Pass 380,670 480,911 808,108 754,489 204,797 257,334 — — 2,886,309 Special mention — 2,985 5,655 2,284 1,604 6,547 — — 19,075 Substandard accrual 224 596 3,353 915 1,143 3,344 — — 9,575 Substandard nonaccrual/doubtful — 523 5,109 4,642 1,229 6,695 — — 18,198 Total residential real estate $ 380,894 $ 488,777 $ 825,606 $ 766,143 $ 214,473 $ 391,442 $ — $ — $ 3,067,335 Premium finance receivables - property and casualty Pass $ 5,737,826 $ 1,204,432 $ — $ 8,281 $ 421 $ — $ — $ — $ 6,950,960 Special mention 92,231 19,192 95 8 — — — — 111,526 Substandard accrual 1,488 4,052 1 4 — — — — 5,545 Substandard nonaccrual/doubtful 7,238 25,281 182 19 2 — — — 32,722 Total premium finance receivables - property and casualty $ 5,838,783 $ 1,252,957 $ 278 $ 8,312 $ 423 $ — $ — $ — $ 7,100,753 Premium finance receivables - life Pass $ 1,137,551 $ 6,820,635 $ 3,929 $ — $ — $ — $ — $ — $ 7,962,115 Special mention — — — — — — — — — Substandard accrual — — — — — — — — — Substandard nonaccrual/doubtful — — — — — — — — — Total premium finance receivables - life $ 1,137,551 $ 6,820,635 $ 3,929 $ — $ — $ — $ — $ — $ 7,962,115 Consumer and other Pass $ 1,562 $ 2,602 $ 749 $ 667 $ 46 $ 32,764 $ 48,721 $ — $ 87,111 Special mention 6 14 11 5 — 140 2 — 178 Substandard accrual 5 14 9 — — 27 9 — 64 Substandard nonaccrual/doubtful — — 1 2 — — — — 3 Total consumer and other $ 1,573 $ 2,630 $ 770 $ 674 $ 46 $ 32,931 $ 48,732 $ — $ 87,356 Total loans Early buy-out loans guaranteed by U.S. government agencies $ — $ 3,762 $ 3,381 $ 3,813 $ 5,700 $ 117,522 $ — $ — $ 134,178 Pass 9,805,921 12,961,554 5,392,035 3,824,685 1,775,791 4,442,572 5,001,524 11,968 43,216,050 Special mention 97,305 94,356 127,893 130,213 24,987 121,946 136,488 1,587 734,775 Substandard accrual 4,377 49,131 60,045 51,885 46,031 107,891 119,677 92 439,129 Substandard nonaccrual/doubtful 7,238 33,621 11,974 26,921 4,501 58,999 7,976 169 151,399 Total loans $ 9,914,841 $ 13,142,424 $ 5,595,328 $ 4,037,517 $ 1,857,010 $ 4,848,930 $ 5,265,665 $ 13,816 $ 44,675,531 Gross write offs Six months ended June 30, 2024 244 29,608 3,464 1,220 2,088 21,973 — — 58,597 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 June 30, 2024 Year of Origination Total (In thousands) 2024 2023 2022 2021 2020 Prior Balance Amortized Cost Balances: U.S. government agencies 1-4 internal grade $ — $ — $ 156,875 $ 147,815 $ 25,000 $ 6,768 $ 336,458 5-7 internal grade — 8-10 internal grade — Total U.S. government agencies $ — $ — $ 156,875 $ 147,815 $ 25,000 $ 6,768 $ 336,458 Municipal 1-4 internal grade $ — $ 4,176 $ 1,035 $ 6,862 $ 258 $ 151,716 $ 164,047 5-7 internal grade — — — — — 2,353 2,353 8-10 internal grade — Total municipal $ — $ 4,176 $ 1,035 $ 6,862 $ 258 $ 154,069 $ 166,400 Mortgage-backed securities 1-4 internal grade $ — $ 362,988 $ 555,653 $ 2,277,717 $ — $ — $ 3,196,358 5-7 internal grade — 8-10 internal grade — Total mortgage-backed securities $ — $ 362,988 $ 555,653 $ 2,277,717 $ — $ — $ 3,196,358 Corporate notes 1-4 internal grade $ — $ — $ 14,968 $ — $ 6,005 $ 36,226 $ 57,199 5-7 internal grade — 8-10 internal grade — Total corporate notes $ — $ — $ 14,968 $ — $ 6,005 $ 36,226 $ 57,199 Total held-to-maturity securities $ 3,756,415 Less: Allowance for credit losses (491) Held-to-maturity securities, net of allowance for credit losses $ 3,755,924 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. June 30, December 31, June 30, (In thousands) 2024 2023 2023 Allowance for loan losses $ 363,719 $ 344,235 $ 302,499 Allowance for unfunded lending-related commitments losses 73,350 83,030 84,881 Allowance for loan losses and unfunded lending-related commitments losses 437,069 427,265 387,380 Allowance for held-to-maturity securities losses 491 347 406 Allowance for credit losses $ 437,560 $ 427,612 $ 387,786 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 June 30, 2024, excluding loans carried at fair value, substandard nonaccrual loans totaling $46.6 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 six months ended June 30, 2024 and June 30, 2023 is as follows: Three months ended June 30, 2024 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 $ 166,518 $ 226,052 $ 7,191 $ 13,701 $ 13,330 $ 383 $ 427,175 Other adjustments — — — — (19) — (19) Charge-offs (9,584) (15,526) — (23) (9,486) (137) (34,756) Recoveries 950 90 35 8 3,663 24 4,770 Provision for credit losses 24,107 13,112 16 (4,913) 7,258 319 39,899 Allowance for credit losses at period end $ 181,991 $ 223,728 $ 7,242 $ 8,773 $ 14,746 $ 589 $ 437,069 By measurement method: Individually measured $ 30,927 $ 6,330 $ — $ 32 $ — $ 1 $ 37,290 Collectively measured 151,064 217,398 7,242 8,741 14,746 588 399,779 Loans at period end Individually measured $ 51,087 $ 48,289 $ 1,100 $ 17,807 $ — $ 3 $ 118,286 Collectively measured 14,103,375 11,898,908 355,213 2,913,694 15,062,868 87,353 44,421,411 Loans held at fair value — — — 135,834 — — 135,834 Three months ended June 30, 2023 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 $ 149,501 $ 194,780 $ 7,728 $ 11,434 $ 11,955 $ 400 $ 375,798 Other adjustments — — — — 41 — 41 Charge-offs (5,629) (8,124) — — (4,653) (110) (18,516) Recoveries 505 25 37 6 890 23 1,486 Provision for credit losses (1,235) 29,015 (798) 812 813 (36) 28,571 Allowance for credit losses at period end $ 143,142 $ 215,696 $ 6,967 $ 12,252 $ 9,046 $ 277 $ 387,380 By measurement method: Individually measured $ 7,205 $ 5,819 $ — $ 106 $ — $ — $ 13,130 Collectively measured 135,937 209,877 6,967 12,146 9,046 277 374,250 Loans at period end Individually measured $ 40,460 $ 18,483 $ 1,361 $ 13,496 $ — $ 4 $ 73,804 Collectively measured 12,560,011 10,590,328 335,613 2,429,297 14,801,971 31,937 40,749,157 Loans held at fair value — — — 200,447 — — 200,447 Six months ended June 30, 2024 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 $ 169,604 $ 223,853 $ 7,116 $ 13,133 $ 13,069 $ 490 $ 427,265 Other adjustments — — — — (50) — (50) Charge-offs (20,799) (20,995) (74) (61) (16,424) (244) (58,597) Recoveries 1,429 121 64 10 5,190 47 6,861 Provision for credit losses 31,757 20,749 136 (4,309) 12,961 296 61,590 Allowance for credit losses at period end $ 181,991 $ 223,728 $ 7,242 $ 8,773 $ 14,746 $ 589 $ 437,069 Six months ended June 30, 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 2016-13 111 1,356 (33) (692) — (1) 741 Other adjustments — — — — 45 — 45 Charge-offs (8,172) (8,129) — — (9,303) (263) (25,867) Recoveries 897 125 72 10 2,213 55 3,372 Provision for credit losses 7,537 37,992 (645) 1,349 5,420 (12) 51,641 Allowance for credit losses at period end $ 143,142 $ 215,696 $ 6,967 $ 12,252 $ 9,046 $ 277 $ 387,380 For the three and six months ended June 30, 2024, the Company recognized approximately $39.9 million and $61.6 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 across a majority of segments coupled with losses experienced in the Commercial, Commercial Real Estate and Premium Finance Receivables portfolios. Uncertainties remain regarding expected economic performance and macroeconomic forecasts utilized in the measurement of the allowance for credit losses as of June 30, 2024. Net charge-offs in the three and six month periods ending June 30, 2024, totaled $30.0 million and $51.7 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 and six month period ended June 30, 2024, the Company recognized approximately $162,000 and $144,000, respectively, of provision for credit losses related to held-to-maturity securities. At June 30, 2024, the Company did not identify any held-to-maturity debt securities within its portfolio that would require a charge-off. 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 June 30, 2024, the Company had $161,000 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 $43.8 million and $50.4 million at June 30, 2024 and 2023, respectively. The tables below presents a summary of the period-end balance of loans to borrowers experiencing financial difficulties during the three and six months ended June 30, 2024 and 2023: Three Months Ended June 30, 2024 (Dollars in thousands) Total Percentage of Total Class of Loan Extension of Term Reduction of Interest Only Delay in Contractual Payments Extension of Term and Reduction of Interest Rate Commercial Commercial, industrial and other $ 2,161 0.0 % $ 2,010 $ — $ — $ 97 $ 54 Commercial real estate Non-construction 340 0.0 21 — 319 — — Home equity — — — — — — — Residential real estate 81 0.0 81 — — — — Premium finance receivables Property and casualty insurance loans 6 0.0 3 3 — — — Total loans $ 2,588 0.0 % $ 2,115 $ 3 $ 319 $ 97 $ 54 Weighted Average Magnitude of Modifications: Three Months Ended June 30, 2024 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 2,161 5 143 34 Commercial real estate Non-construction 340 13 — — Home equity — — — — Residential real estate 81 12 — — Premium finance receivables Property and casualty insurance loans 6 2 86 — Total loans $ 2,588 7 140 34 Three Months Ended June 30, 2023 (Dollars in thousands) Total Percentage of Total Class of Loan Extension of Reduction of Delay in Contractual Payments Extension of Commercial Commercial, industrial and other $ 423 0.0 % $ — $ — $ — $ 423 Commercial real estate Non-construction 4,376 0.0 — — — 4,376 Home equity — — — — — — Residential real estate 264 0.0 143 — — 121 Premium finance receivables Property and casualty insurance loans — — — — — — Total loans $ 5,063 0.0 % $ 143 $ — $ — $ 4,920 Weighted Average Magnitude of Modifications: Three Months Ended June 30, 2023 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 423 41 144 — Commercial real estate Non-construction 4,376 39 212 — Home equity — — — — Residential real estate 264 123 262 — Premium finance receivables Property and casualty insurance loans — — — — Total loans $ 5,063 43 207 — Six Months Ended June 30, 2024 (Dollars in thousands) Total (1) Percentage of Total Class of Loan Extension of Term (1) Reduction of Interest Rate (1) Interest Only Delay in Contractual Payments (1) Extension of Term and Reduction of Interest Rate (1) Commercial Commercial, industrial and other $ 3,219 0.0 % $ 2,956 $ — $ — $ 97 $ 166 Commercial real estate Non-construction 1,469 0.0 293 — 319 857 — Home equity 89 0.0 89 — — — — Residential real estate 282 0.0 114 168 — — — Premium finance receivables Property and casualty insurance loans 6 0.0 3 3 — — — Total loans $ 5,065 0.0 % $ 3,455 $ 171 $ 319 $ 954 $ 166 Weighted Average Magnitude of Modifications: Six Months Ended June 30, 2024 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 3,219 8 113 34 Commercial real estate Non-construction 1,469 29 — 16 Home equity 89 12 — — Residential real estate 282 19 201 — Premium finance receivables Property and casualty insurance loans 6 2 86 — Total loans $ 5,065 11 156 18 Six Months Ended June 30, 2023 (Dollars in thousands) Total Percentage of Total Class of Loan Extension of Reduction of Delay in Contractual Payments Extension of Commercial Commercial, industrial and other $ 37,897 0.3 % $ 1,938 $ 221 $ 35,265 $ 473 Commercial real estate Non-construction 5,709 0.1 467 827 39 4,376 Home equity 203 0.1 203 — — — Residential real estate 1,972 0.1 1,396 271 — 305 Premium finance receivables Property and casualty insurance loans 11 0.0 3 — — 8 Total loans $ 45,792 0.1 % $ 4,007 $ 1,319 $ 35,304 $ 5,162 Weighted Average Magnitude of Modifications: Six Months Ended June 30, 2023 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 37,897 15 108 16 Commercial real estate Non-construction 5,709 40 232 101 Home equity 203 12 — — Residential real estate 1,972 57 284 — Premium finance receivables Property and casualty insurance loans 11 0 50 — Total loans $ 45,792 36 223 17 The Company had commitments of $5.1 million and $43.5 million as of June 30, 2024 and June 30, 2023, respectively, to lend additional funds to borrowers experiencing financial difficulty and for whom the Company has modified the terms of loans in the form of principal forgiveness, an interest rate reduction, an other-than insignificant payment delay or a term extension during the periods presented. The following table presents a summary of all modified loans for borrowers experiencing financial difficulties and such loans that were in payment default under the restructured terms during the respective periods below: (Dollars in thousands) For the Twelve Months Ended June 30, 2024 Three Months Ended June 30, 2024 Six Months Ended June 30, 2024 For the Six Months Ended June 30, 2023 Three Months Ended June 30, 2023 Six Months Ended June 30, 2023 Total Payments in Default (1) Payments in Default (1) Total Payments in Default (1) Payments in Default (1) Commercial Commercial, industrial and other $ 4,685 $ 1,784 $ 1,784 $ 37,897 $ 18,729 $ 18,729 Commercial real estate Construction and development 2,486 — — — — — Non-construction 2,644 639 2,443 5,709 923 923 Home equity 586 — — 203 203 203 Residential real estate 417 384 384 1,972 541 541 Premium finance receivables Property and casualty insurance loans 18 14 14 11 11 11 Total loans $ 10,836 $ 2,821 $ 4,625 $ 45,792 $ 20,407 $ 20,407 (1) Modified loans considered to be in payment default are over 30 days past due subsequent to the restructuring.

Goodwill and Other Acquisition-

Goodwill and Other Acquisition-Related Intangible Assets	6 Months Ended
	Jun. 30, 2024
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, 2023 Goodwill Impairment Goodwill Adjustments June 30, Community banking $ 545,671 $ — $ — $ — $ 545,671 Specialty finance 39,006 — — (717) 38,289 Wealth management 71,995 — — — 71,995 Total $ 656,672 $ — $ — $ (717) $ 655,955 The specialty finance unit’s goodwill decreased $717,000 in the first six months of 2024 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, 2023, the Company utilized a qualitative approach for its annual goodwill impairment tests of the community banking, specialty finance and wealth management reporting units and determined that it was more likely than not that the fair value of all reporting units exceeded the respective carrying value of such reporting unit 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 June 30, 2024, 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 June 30, 2024 is as follows: (In thousands) June 30, December 31, June 30, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,206 $ 55,206 $ 55,206 Accumulated amortization (47,666) (46,125) (44,432) Net carrying amount $ 7,540 $ 9,081 $ 10,774 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 13,340 $ 14,881 $ 16,574 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,961 $ 1,963 $ 1,963 Accumulated amortization (1,861) (1,837) (1,813) Net carrying amount $ 100 $ 126 $ 150 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 26,630 $ 26,630 $ 26,630 Accumulated amortization (19,463) (18,748) (17,701) Net carrying amount $ 7,167 $ 7,882 $ 8,929 Total acquisition-related intangible assets: Gross carrying amount $ 89,597 $ 89,599 $ 89,599 Accumulated amortization (68,990) (66,710) (63,946) Total other acquisition-related intangible assets, net $ 20,607 $ 22,889 $ 25,653 Estimated amortization Actual in six months ended June 30, 2024 $ 2,280 Estimated remaining in 2024 2,021 Estimated—2025 3,482 Estimated—2026 2,772 Estimated—2027 2,156 Estimated—2028 1,591 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 or accelerated 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 $2.3 million and $2.7 million for the six months ended June 30, 2024 and 2023, respectively.

Mortgage Servicing Rights ("MSR

Mortgage Servicing Rights ("MSRs")	6 Months Ended
	Jun. 30, 2024
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 Six Months Ended June 30, June 30, June 30, June 30, (In thousands) 2024 2023 2024 2023 Fair value at beginning of the period $ 201,044 $ 224,470 $ 192,456 $ 230,225 Additions from loans sold with servicing retained 8,223 8,720 13,602 13,827 Servicing rights sold — (30,170) — (30,170) Estimate of changes in fair value due to: Payoffs, paydowns and repurchases (5,534) (5,043) (9,920) (8,952) Changes in valuation inputs or assumptions 877 2,715 8,472 (4,238) Fair value at end of the period $ 204,610 $ 200,692 $ 204,610 $ 200,692 Unpaid principal balance of mortgage loans serviced for others $ 12,211,027 $ 11,752,223 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 early buyout options (“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 June 30, 2024 and June 30, 2023, see Note (14) “Derivative Financial Instruments” in Item 1 of this report.

Deposits

Deposits	6 Months Ended
	Jun. 30, 2024
Deposits [Abstract]
Deposits	Deposits The following table is a summary of deposits as of the dates shown: (Dollars in thousands) June 30, December 31, June 30, Balance: Non-interest-bearing $ 10,031,440 $ 10,420,401 $ 10,604,915 NOW and interest-bearing demand deposits 5,053,909 5,797,649 5,814,836 Wealth management deposits 1,490,711 1,614,499 1,417,984 Money market 16,320,017 15,149,215 14,523,124 Savings 5,882,179 5,790,334 5,321,578 Time certificates of deposit 9,270,770 6,625,072 6,356,270 Total deposits $ 48,049,026 $ 45,397,170 $ 44,038,707 Mix: Non-interest-bearing 21 % 23 % 24 % NOW and interest-bearing demand deposits 11 13 13 Wealth management deposits 3 4 3 Money market 34 33 33 Savings 12 13 12 Time certificates of deposit 19 14 15 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	6 Months Ended
	Jun. 30, 2024
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) June 30, December 31, June 30, FHLB advances $ 3,176,309 $ 2,326,071 $ 2,026,071 Other borrowings: Notes payable 157,024 171,282 185,539 Short-term borrowings — 13,430 17,773 Secured borrowings 391,395 401,897 401,669 Other 58,160 59,204 60,238 Total other borrowings 606,579 645,813 665,219 Subordinated notes 298,113 437,866 437,628 Total FHLB advances, other borrowings and subordinated notes $ 4,081,001 $ 3,409,750 $ 3,128,918 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 2023 Form 10-K. Notes Payable Notes payable balances represent the balances on the Company’s credit agreement with certain unaffiliated banks. At June 30, 2024, the outstanding principal balance under the term loan facility was $157.0 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 June 30, 2024, the Company was in compliance with all such covenants. Short-term Borrowings Short-term borrowings include securities sold under repurchase agreements of customer sweep accounts in connection with master repurchase agreement at the banks. There were no borrowings at June 30, 2024 compared to $13.4 million and $16.3 million at December 31, 2023 and June 30, 2023, respectively. As of June 30, 2024, the Company had no pledged securities related to its customer balances in sweep accounts. Secured Borrowings The balance of secured borrowings primarily represents a third party Canadian transaction (“Canadian Secured Borrowing”). Under the Canadian Secured Borrowing, the Company, through its subsidiary, FIFC Canada, sells an undivided co-ownership interest in all receivables owed to FIFC Canada to an unrelated third party in exchange for cash payments pursuant to a receivables purchase agreement (“Receivables Purchase Agreement”). On May 31, 2023, the Company entered into the eleventh amending agreement to the Receivables Purchase Agreement dated as of December 16, 2014. The amended Receivables Purchase Agreement provides for, among other things, an extension of the maturity date to December 15, 2024, an increase to the facility limit from $420 million to $520 million, and a fee rate increase from 0.775% to 0.825%. Additionally, since Canadian Dollar Offered Rate (“CDOR”) ceased being used in Canada in June 2024, references to CDOR changed to the Benchmark rate. At June 30, 2024, the translated balance of the secured borrowings totaled $380.3 million compared to $392.5 million at December 31, 2023 and $392.4 million at June 30, 2023. The interest rate under the Receivables Purchase Agreement is the Canadian Commercial Paper Rate plus fee rate of 0.825%. The remaining $11.1 million, $9.4 million and $9.3 million within secured borrowings at June 30, 2024, December 31, 2023 and June 30, 2023, respectively, represent 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 Other borrowings represent a fixed-rate promissory note (“Fixed-Rate Promissory Note”) issued by the Company in June 2017. Subsequent amendments to the Fixed-Rate Promissory Note since issuance increased the principal amount to $66.4 million, reduced the interest rate to 1.70% and extended the maturity date to March 31, 2025. The Fixed-Rate Promissory Note contains several restrictive covenants, including the maintenance of various capital adequacy levels, asset quality and profitability ratios, and certain restrictions on dividends and indebtedness. At June 30, 2024, the Company was in compliance with all such covenants. Subordinated Notes At June 30, 2024, the Company had outstanding subordinated notes totaling $298.1 million compared to $437.9 million and $437.6 million at December 31, 2023 and June 30, 2023, respectively. The notes issued in 2019 have a stated interest rate of 4.85% and mature in June 2029. In the second quarter of 2024, the Company repaid the $140.0 million of subordinated notes issued in 2014. The notes had a stated interest rate of 5.00% and matured in June 2024.

Junior Subordinated Debentures

Junior Subordinated Debentures	6 Months Ended
	Jun. 30, 2024
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 June 30, 2024. The junior subordinated debentures represent the par value of the obligations owed to the Trusts. (Dollars in thousands) Common Trust Junior Rate Structure (1) Contractual Rate at 6/30/2024 Issue Maturity Earliest Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 S+0.26161+3.25 8.84 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 S+0.26161+2.80 8.39 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 S+0.26161+2.60 8.19 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 S+0.26161+1.95 7.55 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 S+0.26161+1.45 7.04 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 S+0.26161+1.63 7.23 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 S+0.26161+3.00 8.59 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 S+0.26161+3.00 8.59 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 S+0.26161+3.00 8.59 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 S+0.26161+1.75 7.35 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 S+0.26161+1.62 7.22 % 06/2007 09/2037 06/2012 Total $ 253,566 7.79 % (1) The interest rates on the variable rate junior subordinated debentures are based on the three-month Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR”) and reset on a quarterly basis. The junior subordinated debentures totaled $253.6 million at June 30, 2024, December 31, 2023 and June 30, 2023. At June 30, 2024, the weighted average contractual interest rate on the junior subordinated debentures was 7.79%.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2024
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 (10) “Deposits” in Item 1 of this report 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 2023 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) June 30, June 30, Net interest income: Community Banking $ 358,832 $ 346,232 $ 12,600 4 % Specialty Finance 95,191 84,993 10,198 12 Wealth Management 7,928 7,404 524 7 Total Operating Segments 461,951 438,629 23,322 5 Intersegment Eliminations 8,659 8,908 (249) (3) Consolidated net interest income $ 470,610 $ 447,537 $ 23,073 5 % Provision for credit losses: Community Banking $ 36,325 $ 26,713 $ 9,612 36 % Specialty Finance 3,736 1,801 1,935 107 Wealth Management — — — — Total Operating Segments 40,061 28,514 11,547 40 Intersegment Eliminations — — — — Consolidated provision for credit losses $ 40,061 $ 28,514 $ 11,547 40 % Non-interest income: Community Banking $ 71,619 $ 68,130 $ 3,489 5 % Specialty Finance 32,317 31,737 580 2 Wealth Management 35,605 33,391 2,214 7 Total Operating Segments 139,541 133,258 6,283 5 Intersegment Eliminations (18,394) (20,228) 1,834 (9) Consolidated non-interest income $ 121,147 $ 113,030 $ 8,117 7 % Net revenue: Community Banking $ 430,451 $ 414,362 $ 16,089 4 % Specialty Finance 127,508 116,730 10,778 9 Wealth Management 43,533 40,795 2,738 7 Total Operating Segments 601,492 571,887 29,605 5 Intersegment Eliminations (9,735) (11,320) 1,585 (14) Consolidated net revenue $ 591,757 $ 560,567 $ 31,190 6 % Segment profit: Community Banking $ 91,235 $ 102,517 $ (11,282) (11) % Specialty Finance 53,091 46,402 6,689 14 Wealth Management 8,062 5,831 2,231 38 Consolidated net income $ 152,388 $ 154,750 $ (2,362) (2) % Segment assets: Community Banking $ 47,611,508 $ 42,452,673 $ 5,158,835 12 % Specialty Finance 11,014,840 10,549,819 465,021 4 Wealth Management 1,155,168 1,283,684 (128,516) (10) Consolidated total assets $ 59,781,516 $ 54,286,176 $ 5,495,340 10 % NM - Not meaningful Six Months Ended $ Change in % Change in (Dollars in thousands) June 30, June 30, Net interest income: Community Banking $ 722,517 $ 716,080 $ 6,437 1 % Specialty Finance 177,473 155,344 22,129 14 Wealth Management 15,686 16,359 (673) (4) Total Operating Segments 915,676 887,783 27,893 3 Intersegment Eliminations 19,128 17,749 1,379 8 Consolidated net interest income $ 934,804 $ 905,532 $ 29,272 3 % Provision for credit losses: Community Banking $ 56,717 $ 47,812 $ 8,905 19 % Specialty Finance 5,017 3,747 1,270 34 Wealth Management — — — — Total Operating Segments 61,734 51,559 10,175 20 Intersegment Eliminations — — — — Consolidated provision for credit losses $ 61,734 $ 51,559 $ 10,175 20 % Non-interest income: Community Banking $ 146,255 $ 136,863 $ 9,392 7 % Specialty Finance 59,634 57,527 2,107 4 Wealth Management 94,090 63,688 30,402 48 Total Operating Segments 299,979 258,078 41,901 16 Intersegment Eliminations (38,252) (37,279) (973) 3 Consolidated non-interest income $ 261,727 $ 220,799 $ 40,928 19 % Net revenue: Community Banking $ 868,772 $ 852,943 $ 15,829 2 % Specialty Finance 237,107 212,871 24,236 11 Wealth Management 109,776 80,047 29,729 37 Total Operating Segments 1,215,655 1,145,861 69,794 6 Intersegment Eliminations (19,124) (19,530) 406 (2) Consolidated net revenue $ 1,196,531 $ 1,126,331 $ 70,200 6 % Segment profit: Community Banking $ 211,282 $ 236,749 $ (25,467) 12 % Specialty Finance 95,614 83,139 12,475 4 Wealth Management 32,786 15,060 17,726 (10) Consolidated net income $ 339,682 $ 334,948 $ 4,734 10 % NM - Not meaningful

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2024
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 June 30, 2024, December 31, 2023 and June 30, 2023: Derivative Assets Derivative Liabilities (In thousands) June 30, December 31, June 30, June 30, December 31, June 30, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ 7,532 $ 40,116 $ 2,154 $ 96,825 $ 44,456 $ 121,347 Interest rate derivatives designated as Fair Value Hedges 12,678 12,349 16,255 — 273 — Total derivatives designated as hedging instruments under ASC 815 $ 20,210 $ 52,465 $ 18,409 $ 96,825 $ 44,729 $ 121,347 Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 215,275 $ 211,490 $ 261,205 $ 217,157 $ 210,397 $ 261,066 Interest rate lock commitments 4,795 4,511 3,487 67 — 172 Forward commitments to sell mortgage loans 102 — 2,769 597 5,212 38 Commodity forward contracts 702 888 434 304 609 214 Foreign exchange contracts 2,776 6,372 8,444 2,709 6,308 8,335 Total derivatives not designated as hedging instruments under ASC 815 $ 223,650 $ 223,261 $ 276,339 $ 220,834 $ 222,526 $ 269,825 Total Derivatives $ 243,860 $ 275,726 $ 294,748 $ 317,659 $ 267,255 $ 391,172 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 rate or in which the interest rate index specified in the contract is below the agreed upon floor strike rate at the end of each period. As of June 30, 2024, the Company had various interest rate collar and swap derivatives designated as cash flow hedges of variable rate loans. 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. 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 June 30, 2024: June 30, 2024 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 $ (16,589) Buy 2.750% floor, sell 4.320% cap; matures October 2026 500,000 (4,740) Buy 2.000% floor, sell 3.450% cap; matures September 2027 1,250,000 (37,289) Interest Rate Swaps at 1-month CME term SOFR: Fixed 3.748%; matures December 2025 250,000 (3,114) Fixed 3.759%; matures December 2025 250,000 (3,075) Fixed 3.680%; matures February 2026 250,000 (3,735) Fixed 4.176%; matures March 2026 250,000 (1,773) Fixed 3.915%; matures March 2026 250,000 (2,826) Fixed 4.450%; matures July 2026 250,000 (206) Fixed 3.515%, matures December 2026 250,000 (4,597) Fixed 3.512%; matures December 2026 250,000 (4,614) Fixed 3.453%; matures February 2027 250,000 (5,369) Fixed 4.150%; matures July 2027 250,000 (591) Fixed 3.748%; matures March 2028 250,000 (3,203) Fixed 3.526%; matures March 2028 250,000 (5,104) Fixed 3.993%; matures October 2029 100,000 444 Fixed 3.993%; matures October 2029 250,000 1,111 Fixed 4.245%; matures November 2029 175,000 2,988 Fixed 4.245%; matures November 2029 175,000 2,988 Total Cash Flow Hedges $ 6,700,000 $ (89,294) 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 a term borrowing 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 a term borrowing 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 Six Months Ended (In thousands) June 30, June 30, June 30, June 30, Unrealized gain at beginning of period $ (38,553) $ 44,692 $ 43,538 $ 10,026 Amount reclassified from accumulated other comprehensive income or loss to interest income or expense on deposits, loans, and other borrowings 20,524 14,267 40,342 18,014 Amount of loss recognized in other comprehensive income or loss (31,367) (120,698) (133,276) (89,779) Unrealized (loss) gain at end of period $ (49,396) $ (61,739) $ (49,396) $ (61,739) As of June 30, 2024, the Company estimated that during the next 12 months $60.6 million will be reclassified from accumulated other comprehensive income or loss as a decrease to net interest income. Such estimate consists of $13.3 million reclassified as a reduction to interest expense on the terminated cash flow hedges discussed above and $73.9 million reclassified as a reduction 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 June 30, 2024, the Company had 13 interest rate swaps with an aggregate notional amount of $213.1 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 June 30, 2024: (In thousands) June 30, 2024 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 $ 199,732 $ (12,684) $ (69) Available-for-sale debt securities 672 (18) — 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 Six Months Ended June 30, 2024 June 30, 2024 Interest rate swaps Interest and fees on loans $ (16) $ (6) 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. As of June 30, 2024, there were no interest rate caps outstanding that were designed to act as an economic hedge. 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 June 30, 2024 and December 31, 2023, the Company had interest rate derivative transactions with an aggregate notional amount of approximately $12.2 billion and $11.4 billion, respectively, (all interest rate swaps and caps with customers and third parties) related to this program. At June 30, 2024 these interest rate derivatives had maturity dates ranging from July 2024 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 June 30, 2024 and December 31, 2023, the Company had interest rate lock commitments with an aggregate notional amount of approximately $237.9 million and $129.9 million, and forward commitments to sell mortgage loans with an aggregate notional amount of approximately $641.3 million and $626.9 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 June 30, 2024 and December 31, 2023, the Company had commodity derivative transactions with an aggregate notional amount of approximately $12.6 million and $8.4 million, respectively, (all forward contracts with customers and third parties) related to this program. At June 30, 2024, these commodity derivatives had maturity dates ranging from July 2024 to October 2025. 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 June 30, 2024 and December 31, 2023, the Company held foreign currency derivatives with an aggregate notional amount of approximately $138.8 million and $144.3 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 June 30, 2024, December 31, 2023 or June 30, 2023. 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. The Company held six interest rate derivatives with an aggregate notional value of $170.0 million at June 30, 2024 and four interest rate derivatives with an aggregate notional value of and $195.0 million at December 31, 2023, 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 Six Months Ended Derivative Location in income statement June 30, June 30, June 30, June 30, Interest rate swaps and caps Trading gains, net $ (102) $ 12 $ 493 $ 812 Mortgage banking derivatives Mortgage banking revenue 3,721 4,791 3,706 8,431 Commodity contracts Trading gains, net 130 49 398 226 Foreign exchange contracts Trading gains, net 11 — 19 — Covered call options Fees from covered call options 2,056 2,578 6,903 12,969 Derivative contract held as economic hedge on MSRs Mortgage banking revenue (772) (726) (3,349) 220 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 June 30, 2024, 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. If the Company had breached any of these provisions and those derivatives subject to such agreements were in a liability position, and the derivatives were terminated as a result, the Company would have been required to settle its obligations under the agreements at the termination value and would have been required to pay any additional amounts due in excess of amounts previously posted as collateral with the respective counterparty. 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) June 30, December 31, June 30, June 30, December 31, June 30, Gross Amounts Recognized $ 235,485 $ 263,955 $ 279,614 $ 313,982 $ 255,126 $ 382,413 Less: Amounts offset in the Statements of Condition — — — — — — Net amount presented in the Statements of Condition $ 235,485 $ 263,955 $ 279,614 $ 313,982 $ 255,126 $ 382,413 Gross amounts not offset in the Statements of Condition Offsetting Derivative Positions (114,662) (76,514) (125,159) (114,662) (76,514) (125,159) Collateral Posted (85,762) (144,899) (145,735) — — — Net Credit Exposure $ 35,061 $ 42,542 $ 8,720 $ 199,320 $ 178,612 $ 257,254

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	6 Months Ended
	Jun. 30, 2024
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 June 30, 2024, the Company classified $95.8 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 second quarter of 2024, 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 June 30, 2024 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 June 30, 2024, the Company classified $40.5 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 June 30, 2024 was 6.83%. 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 0.36% with credit loss discount ranging from 0%-13% at June 30, 2024. 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 June 30, 2024, the Company classified $45.7 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 June 30, 2024 was 6.83%. 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 7.86% at June 30, 2024. 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 5.9 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 1.10% with credit loss discounts ranging from 0%-17% at June 30, 2024. 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 June 30, 2024, the Company classified $204.6 million of MSRs as Level 3. The weighted average discount rate used as an input to value the pool of MSRs at June 30, 2024 was 10.98% with discount rates applied ranging from 1%-36%. 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%-90% or a weighted average prepayment speed of 7.86%. Further, for current and delinquent loans, the Company assumed a weighted average cost of servicing of $77 and $361, 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 (9) “Mortgage Servicing Rights (“MSRs”)” in Item 1 of this report 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 June 30, 2024, the Company classified $4.8 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 June 30, 2024 was 81.17% with pull-through rates applied ranging from 4% 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: June 30, 2024 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 102,712 $ 102,712 $ — $ — U.S. government agencies 45,192 — 45,192 — Municipal 146,608 — 50,816 95,792 Corporate notes 77,975 — 77,975 — Mortgage-backed 3,957,470 — 3,957,470 — Trading account securities 4,134 — 4,134 — Equity securities with readily determinable fair value 112,173 104,107 8,066 — Mortgage loans held-for-sale 411,851 — 371,306 40,545 Loans held-for-investment 135,834 — 90,113 45,721 MSRs 204,610 — — 204,610 Nonqualified deferred compensation assets 16,041 — 16,041 — Derivative assets 243,860 — 239,065 4,795 Total $ 5,458,460 $ 206,819 $ 4,860,178 $ 391,463 Derivative liabilities $ 317,659 $ — $ 317,659 $ — December 31, 2023 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 6,968 $ 6,968 $ — $ — U.S. government agencies 45,124 — 45,124 — Municipal 140,958 — 54,721 86,237 Corporate notes 76,531 — 76,531 — Mortgage-backed 3,233,334 — 3,233,334 — Trading account securities 4,707 — 4,707 — Equity securities with readily determinable fair value 139,268 131,202 8,066 — Mortgage loans held-for-sale 292,722 — 265,887 26,835 Loans held-for-investment 155,261 — 94,591 60,670 MSRs 192,456 — — 192,456 Nonqualified deferred compensation assets 15,238 — 15,238 — Derivative assets 275,726 — 271,216 4,510 Total $ 4,578,293 $ 138,170 $ 4,069,415 $ 370,708 Derivative liabilities $ 267,255 $ — $ 267,255 $ — June 30, 2023 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 74,275 — 74,275 — Municipal 167,411 — 53,256 114,155 Corporate notes 72,060 — 72,060 — Mortgage-backed 3,178,735 — 3,178,735 — Trading account securities 3,027 — 3,027 — Equity securities with readily determinable fair value 116,275 108,209 8,066 — Mortgage loans held-for-sale 338,728 — 309,322 29,406 Loans held-for-investment 193,953 — 132,830 61,123 MSRs 200,692 — — 200,692 Nonqualified deferred compensation assets 14,796 — 14,796 — Derivative assets 294,748 — 291,261 3,487 Total $ 4,654,700 $ 108,209 $ 4,137,628 $ 408,863 Derivative liabilities $ 391,172 $ — $ 391,172 $ — The aggregate remaining contractual principal balance outstanding as of June 30, 2024, December 31, 2023 and June 30, 2023 for mortgage loans held-for-sale measured at fair value under ASC 825 was $414.1 million, $291.7 million and $345.7 million, respectively, while the aggregate fair value of mortgage loans held-for-sale was $411.9 million, $292.7 million and $338.7 million, for the same respective periods, as shown in the above tables. At June 30, 2024, $2.1 million of mortgage loans held-for-sale were classified as nonaccrual compared to $649,000 as of December 31, 2023 and $582,000 as of June 30, 2023. Additionally, there were $39.4 million of loans past due greater than 90 days and still accruing in the mortgage loans held-for-sale portfolio as of June 30, 2024 compared to $26.6 million as of December 31, 2023 and $29.6 million as of June 30, 2023. 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 June 30, 2024, December 31, 2023, and June 30, 2023 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 June 30, 2024, December 31, 2023 and June 30, 2023 for loans held-for-investment measured at fair value under ASC 825 was $136.1 million, $156.9 million and $196.6 million, respectively, while the aggregate fair value of loans held-for-investment was $135.8 million, $155.3 million and $194.0 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 and six months ended June 30, 2024 and 2023 are summarized as follows: Mortgage loans held-for-sale Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at April 1, 2024 $ 88,219 $ 33,726 $ 49,317 $ 201,044 $ 6,212 Total net (losses) gains included in: Net income (1) — 205 66 3,566 (1,417) Other comprehensive income or loss (680) — — — — Purchases 9,682 — — — — Settlements (1,429) (10,269) (7,709) — — Net transfers into Level 3 — 16,883 4,047 — — Balance at June 30, 2024 $ 95,792 $ 40,545 $ 45,721 $ 204,610 $ 4,795 Mortgage loans held-for-sale Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at April 1, 2023 $ 112,257 $ 44,250 $ 69,493 $ 224,470 $ 5,356 Total net (losses) gains included in: Net income (1) — 402 (619) 6,392 (1,869) Other comprehensive income or loss (3,161) — — — — Purchases 6,978 — — — — Sales — — — (30,170) — Settlements (1,919) (23,973) (16,593) — — Net transfers into Level 3 — 8,727 8,842 — — Balance at June 30, 2023 $ 114,155 $ 29,406 $ 61,123 $ 200,692 $ 3,487 (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 June 30, 2024: June 30, 2024 Three Months Ended June 30, 2024 Fair Value Losses Recognized, net Six Months Ended June 30, 2024 Fair Value Losses Recognized, net (In thousands) Total Level 1 Level 2 Level 3 Individually assessed loans - foreclosure probable and collateral-dependent $ 118,286 $ — $ — $ 118,286 $ 25,113 $ 41,839 Other real estate owned (1) 19,731 — — 19,731 — 207 Total $ 138,017 $ — $ — $ 138,017 $ 25,113 $ 42,046 (1) Net fair value losses recognized 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 (7) “Allowance for Credit Losses” in Item 1 of this report. At June 30, 2024, the Company had $118.3 million of individually assessed loans classified as Level 3. All of the $118.3 million of individually assessed loans were measured at fair value based on the underlying collateral of the loan as shown in the table above. 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 June 30, 2024, the Company had $19.7 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 June 30, 2024 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 $ 95,792 Bond pricing Equivalent rating BBB-AA+ N/A Increase Mortgage loans held-for-sale 40,545 Discounted cash flows Discount rate 6.83% 6.83% Decrease Credit discount 0% - 13% 0.36% Decrease Loans held-for-investment 45,721 Discounted cash flows Discount rate 6.75% - 6.83% 6.83% Decrease Credit discount 0% - 17% 1.10% Decrease Constant prepayment rate (CPR) - current loans 7.86% 7.86% Decrease Average life - delinquent loans (in years) 1.2 years - 10.6 years 5.9 years Decrease MSRs 204,610 Discounted cash flows Discount rate 1% - 36% 10.98% Decrease Constant prepayment rate (CPR) 0% - 90% 7.86% Decrease Cost of servicing $70 - $200 $ 77 Decrease Cost of servicing - delinquent $200 - 1,000 $ 361 Decrease Derivatives 4,795 Discounted cash flows Pull-through rate 4% - 100% 81.17 % Increase Measured at fair value on a non-recurring basis: Individually assessed loans - foreclosure probable and collateral-dependent 118,286 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 19,731 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 June 30, 2024 At December 31, 2023 At June 30, 2023 Carrying Fair Carrying Fair Carrying Fair (In thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 415,524 $ 415,524 $ 423,464 $ 423,464 $ 513,917 $ 513,917 Interest-bearing deposits with banks 2,824,314 2,824,314 2,084,323 2,084,323 2,163,708 2,163,708 Available-for-sale securities 4,329,957 4,329,957 3,502,915 3,502,915 3,492,481 3,492,481 Held-to-maturity securities 3,755,924 3,060,467 3,856,916 3,215,468 3,564,473 2,887,891 Trading account securities 4,134 4,134 4,707 4,707 3,027 3,027 Equity securities with readily determinable fair value 112,173 112,173 139,268 139,268 116,275 116,275 FHLB and FRB stock, at cost 256,495 256,495 205,003 205,003 195,117 195,117 Brokerage customer receivables 13,682 13,682 10,592 10,592 15,722 15,722 Mortgage loans held-for-sale, at fair value 411,851 411,851 292,722 292,722 338,728 338,728 Loans held-for-investment, at fair value 135,834 135,834 155,261 155,261 193,953 193,953 Loans held-for-investment, at amortized cost 44,539,697 43,461,319 41,976,570 41,090,010 40,829,455 40,142,976 Nonqualified deferred compensation assets 16,041 16,041 15,238 15,238 14,796 14,796 Derivative assets 243,860 243,860 275,726 275,726 294,748 294,748 Accrued interest receivable and other 505,504 505,504 477,832 477,832 434,553 434,553 Total financial assets $ 57,564,990 $ 55,791,155 $ 53,420,537 $ 51,892,529 $ 52,170,953 $ 50,807,892 Financial Liabilities Non-maturity deposits $ 38,778,256 $ 38,778,256 $ 38,772,098 $ 38,772,098 $ 37,682,437 $ 37,682,437 Time certificates of deposit 9,270,770 9,248,374 6,625,072 6,603,746 6,356,270 6,300,161 FHLB advances 3,176,309 3,195,138 2,326,071 2,367,107 2,026,071 2,072,317 Other borrowings 606,579 605,305 645,813 643,755 665,219 662,156 Subordinated notes 298,113 273,666 437,866 413,501 437,628 405,762 Junior subordinated debentures 253,566 253,571 253,566 253,579 253,566 253,562 Derivative liabilities 317,659 317,659 267,255 267,255 391,172 391,172 Accrued interest payable 66,373 66,373 51,116 51,116 45,359 45,359 Total financial liabilities $ 52,767,625 $ 52,738,342 $ 49,378,857 $ 49,372,157 $ 47,857,722 $ 47,812,926 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). The fair value for 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 category. In accordance with ASC 820, the Company has categorized these loans as a Level 3 fair value measurement. Time certificates of deposit. The fair value of time 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 time certificates of deposit. In accordance with ASC 820, the Company has categorized time certificates of deposit as a Level 3 fair value measurement. FHLB advances. The fair value of FHLB advances is estimated by 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. Junior subordinated debentures.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans As of June 30, 2024, approximately 662,000 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 2023 Form 10-K. Stock-based compensation expense recognized in the Consolidated Statements of Income was $9.0 million in the second quarter of 2024 and $8.1 million in the second quarter of 2023, and $18.1 million and $16.4 million in the six months ended June 30, 2024 and 2023, respectively. A summary of the Plans’ stock option activity for the six months ended June 30, 2024 and June 30, 2023 is presented below: Stock Options Common Weighted Remaining Contractual Term (1) Intrinsic Value (2) (in thousands) Outstanding at January 1, 2024 13,100 $ 42.76 Granted — — Exercised (775) 32.26 Forfeited or canceled — — Outstanding at June 30, 2024 12,325 $ 43.42 4.0 $ 680 Exercisable at June 30, 2024 12,325 $ 43.42 4.0 $ 680 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 June 30, 2023 13,875 $ 42.18 4.5 $ 422 Exercisable at June 30, 2023 13,875 $ 42.18 4.5 $ 422 (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 six months ended June 30, 2024 and June 30, 2023, was approximately $50,000 and $2.5 million, respectively. Cash received from option exercises under the Plans for the six months ended June 30, 2024 and June 30, 2023 was approximately $25,000 and $2.2 million, respectively. A summary of the Plans’ restricted share activity for the six months ended June 30, 2024 and June 30, 2023 is presented below: Six months ended June 30, 2024 Six months ended June 30, 2023 Restricted Shares Common Weighted Common Weighted Outstanding at January 1 746,123 $ 79.60 610,155 $ 73.21 Granted 389,198 99.50 260,173 88.29 Vested and issued (228,719) 69.54 (103,161) 64.08 Forfeited or canceled (7,893) 91.47 (7,638) 82.82 Outstanding at June 30 898,709 $ 90.68 759,529 $ 79.52 Vested, but deferred, at June 30 99,844 $ 53.98 98,247 $ 53.35 A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the six months ended June 30, 2024 and June 30, 2023 is presented below: Six months ended June 30, 2024 Six months ended June 30, 2023 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 553,026 $ 79.69 545,379 $ 70.30 Granted 96,952 58.78 186,313 92.45 Added by performance factor at vesting 111,304 100.44 23,161 63.64 Vested and issued (295,644) 58.69 (178,203) 63.64 Forfeited or canceled (3,154) 95.94 (7,909) 82.73 Outstanding at June 30 462,484 $ 93.61 568,741 $ 79.20 Vested, but deferred, at June 30 21,593 $ 43.95 36,438 $ 44.99

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income or Loss and Earnings Per Share	6 Months Ended
	Jun. 30, 2024
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 April 1, 2024 $ (408,002) $ (28,329) $ (48,817) $ (485,148) Other comprehensive loss during the period, net of tax, before reclassifications (15,275) (23,070) (2,905) (41,250) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (885) 15,095 — 14,210 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 (10) — — (10) Net other comprehensive (loss) during the period, net of tax $ (16,170) $ (7,975) $ (2,905) $ (27,050) Balance at June 30, 2024 $ (424,172) $ (36,304) $ (51,722) $ (512,198) Balance at January 1, 2024 $ (350,697) $ 32,049 $ (42,583) $ (361,231) Other comprehensive loss during the period, net of tax, before reclassifications (72,562) (98,024) (9,139) (179,725) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (866) 29,671 — 28,805 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 (47) — — (47) Net other comprehensive loss during the period, net of tax $ (73,475) $ (68,353) $ (9,139) $ (150,967) Balance at June 30, 2024 $ (424,172) $ (36,304) $ (51,722) $ (512,198) Balance at April 1, 2023 $ (351,995) $ 32,809 $ (48,250) $ (367,436) Other comprehensive income during the period, net of tax, before reclassifications (33,909) (88,533) 5,344 (117,098) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (1) 10,465 — 10,464 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 (20) — — (20) Net other comprehensive income during the period, net of tax $ (33,930) $ (78,068) $ 5,344 $ (106,654) Balance at June 30, 2023 $ (385,925) $ (45,259) $ (42,906) $ (474,090) Balance at January 1, 2023 $ (386,057) $ 7,381 $ (48,960) $ (427,636) Other comprehensive loss during the period, net of tax, before reclassifications 594 (65,854) 6,054 (59,206) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (410) 13,214 — 12,804 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 (52) — — (52) Net other comprehensive loss during the period, net of tax $ 132 $ (52,640) $ 6,054 $ (46,454) Balance at June 30, 2023 $ (385,925) $ (45,259) $ (42,906) $ (474,090) (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 Six Months Ended Impacted Line on the June 30, June 30, 2024 2023 2024 2023 Accumulated unrealized gains on securities Gains included in net income $ 1,204 $ 2 $ 1,178 $ 562 (Losses) gains on investment securities, net 1,204 2 1,178 562 Income before taxes Tax effect (319) (1) (312) (152) Income tax expense Net of tax $ 885 $ 1 $ 866 $ 410 Net income Accumulated unrealized gains on derivative instruments Amount reclassified to interest income on loans $ 23,849 $ 18,661 $ 48,324 $ 27,733 Interest on Loans Amount reclassified to interest expense on deposits $ (3,325) $ (4,657) $ (7,982) $ (10,245) Interest on deposits Amount reclassified to interest expense on other borrowings — 263 — 526 Interest on other borrowings (20,524) (14,267) (40,342) (18,014) Income before taxes Tax effect 5,429 3,802 10,671 4,800 Income tax expense Net of tax $ (15,095) $ (10,465) $ (29,671) $ (13,214) 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 Six Months Ended (Dollars in thousands, except per share data) June 30, June 30, June 30, June 30, Net income $ 152,388 $ 154,750 $ 339,682 $ 334,948 Less: Preferred stock dividends 6,991 6,991 13,982 13,982 Net income applicable to common shares (A) $ 145,397 $ 147,759 $ 325,700 $ 320,966 Weighted average common shares outstanding (B) 61,839 61,192 61,660 61,072 Effect of dilutive potential common shares Common stock equivalents 926 902 901 933 Weighted average common shares and effect of dilutive potential common shares (C) 62,765 62,094 62,561 62,005 Net income per common share: Basic (A/B) $ 2.35 $ 2.41 $ 5.28 $ 5.26 Diluted (A/C) $ 2.32 $ 2.38 $ 5.21 $ 5.18 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. At the January 2024 meeting of the board of directors of the Company (the “Board of Directors”), a quarterly cash dividend of $0.45 per share ($1.80 on an annualized basis) was declared. It was paid on February 22, 2024 to shareholders of record as of February 8, 2024. At the April

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net income	$ 152,388	$ 154,750	$ 339,682	$ 334,948

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Jun. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [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, 2023 (“2023 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 2023 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	Equity Method and Joint Ventures - Investments in Tax Credit Structures In March 2023, the FASB issued ASU No. 2023-02, “Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method,” which allows reporting entities the option to apply the proportional amortization method to other tax credit programs besides the Low-Income Housing Tax Credit structures. The guidance requires application of the proportional amortization method on a tax-credit-program-by-tax-credit-program basis rather than electing the method at the reporting level entity level. The Company adopted ASU No. 2023-02 as of January 1, 2024. Adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Segment Reporting In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” to enhance public entity disclosures regarding significant segment expenses which are regularly reported to an entity’s chief operating decision-maker (“CODM”) and included in a segment’s reported profit or loss. This ASU requires disclosure of the amount and composition of “other segment items,” the title and position of the CODM, and how the CODM uses reported measures of profit or loss to assess segment performance. Further, the guidance requires certain segment disclosures previously provided only annually, on an interim basis. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The guidance is to be applied retrospectively. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements. Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” to enhance the transparency and decision usefulness of income tax disclosures. This ASU requires annually that all entities disclose increasingly disaggregated information on amount of income taxes paid. Further, this ASU requires annually that all public entities must disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a specific quantitative threshold. This guidance is effective for fiscal years beginning after December 15, 2024, and is to be applied either on a prospective basis or retrospective basis. Early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements. Compensation – Scope Application of Profits Interest and Similar Awards In March 2024, the FASB issued ASU No. 2024-01, “Compensation – Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards” which clarifies the guidance by providing an illustrative example to demonstrate how an entity should apply the scope guidance in Topic 718 when determining whether profits interest and similar awards should be accounted for in accordance with Topic 718. For public business entities, this guidance is effective for fiscal years beginning after December 15, 2024, including interim periods therein, and is to be applied either on a prospective basis or retrospective basis. Early adoption is permitted. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements.
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)	6 Months Ended
	Jun. 30, 2024
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: June 30, 2024 (In thousands) Amortized Gross Gross Fair Available-for-sale securities U.S. Treasury $ 102,721 $ 5 $ (14) $ 102,712 U.S. government agencies 50,000 — (4,808) 45,192 Municipal 151,347 390 (5,129) 146,608 Corporate notes: Financial issuers 83,996 — (7,011) 76,985 Other 1,000 — (10) 990 Mortgage-backed: (1) Residential mortgage-backed securities 4,320,215 361 (541,742) 3,778,834 Commercial (multi-family) mortgage-backed securities 18,096 8 (626) 17,478 Collateralized mortgage obligations 179,315 629 (18,786) 161,158 Total available-for-sale securities $ 4,906,690 $ 1,393 $ (578,126) $ 4,329,957 Held-to-maturity securities U.S. government agencies $ 336,458 $ — $ (70,928) $ 265,530 Municipal 166,400 155 (6,789) 159,766 Mortgage-backed: (1) Residential mortgage-backed securities 2,962,721 — (591,601) 2,371,120 Commercial (multi-family) mortgage-backed securities 6,390 — (300) 6,090 Collateralized mortgage obligations 227,247 362 (23,636) 203,973 Corporate notes 57,199 — (3,211) 53,988 Total held-to-maturity securities $ 3,756,415 $ 517 $ (696,465) $ 3,060,467 Less: Allowance for credit losses (491) Held-to-maturity securities, net of allowance for credit losses $ 3,755,924 Equity securities with readily determinable fair value $ 117,674 $ 2,882 $ (8,383) $ 112,173 (1) None of our mortgage-backed securities are subprime. December 31, 2023 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ 6,960 $ 8 $ — $ 6,968 U.S. government agencies 50,000 — (4,876) 45,124 Municipal 144,299 657 (3,998) 140,958 Corporate notes: Financial issuers 83,996 — (8,456) 75,540 Other 1,000 — (9) 991 Mortgage-backed: (1) Residential Mortgage-backed securities 3,505,012 1,392 (446,784) 3,059,620 Commercial (multi-family) mortgage-backed securities 13,201 68 (289) 12,980 Collateralized mortgage obligations 175,346 1,400 (16,012) 160,734 Total available-for-sale securities $ 3,979,814 $ 3,525 $ (480,424) $ 3,502,915 Held-to-maturity securities U.S. government agencies $ 336,468 $ — $ (67,058) $ 269,410 Municipal 172,933 565 (3,778) 169,720 Mortgage-backed: (1) Residential Mortgage-backed securities 3,042,828 1,922 (549,265) 2,495,485 Commercial (multi-family) mortgage-backed securities 6,415 — (184) 6,231 Collateralized mortgage obligations 241,075 978 (21,502) 220,551 Corporate notes 57,544 7 (3,480) 54,071 Total held-to-maturity securities $ 3,857,263 $ 3,472 $ (645,267) $ 3,215,468 Less: Allowance for credit losses (347) Held-to-maturity securities, net of allowance for credit losses $ 3,856,916 Equity securities with readily determinable fair value $ 143,312 $ 3,500 $ (7,544) $ 139,268 (1) None of our mortgage-backed securities are subprime. June 30, 2023 Amortized Gross Gross Fair (In thousands) Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 80,000 — (5,725) 74,275 Municipal 173,540 102 (6,231) 167,411 Corporate notes: Financial issuers 83,995 — (12,920) 71,075 Other 1,000 — (15) 985 Mortgage-backed: (1) Mortgage-backed securities 3,585,943 — (483,659) 3,102,284 Collateralized mortgage obligations 94,373 — (17,922) 76,451 Total available-for-sale securities $ 4,018,851 $ 102 $ (526,472) $ 3,492,481 Held-to-maturity securities U.S. government agencies $ 339,604 $ — $ (71,022) $ 268,582 Municipal 176,128 362 (4,502) 171,988 Mortgage-backed: (1) Mortgage-backed securities 2,832,138 — (574,114) 2,258,024 Collateralized mortgage obligations 159,120 — (23,014) 136,106 Corporate notes 57,889 35 (4,733) 53,191 Total held-to-maturity securities $ 3,564,879 $ 397 $ (677,385) $ 2,887,891 Less: Allowance for credit losses (406) Held-to-maturity securities, net of allowance for credit losses $ 3,564,473 Equity securities with readily determinable fair value $ 120,629 $ 3,711 $ (8,065) $ 116,275 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime.
Schedule of Available-for-sale Investment Securities Portfolios	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 June 30, 2024: 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. Treasury $ 90,735 $ (14) $ — $ — $ 90,735 $ (14) U.S. government agencies — — 45,192 (4,808) 45,192 (4,808) Municipal 42,560 (333) 78,578 (4,796) 121,138 (5,129) Corporate notes: Financial issuers — — 76,985 (7,011) 76,985 (7,011) Other — — 990 (10) 990 (10) Mortgage-backed: (1) Residential mortgage-backed securities 1,226,130 (19,491) 2,537,424 (522,251) 3,763,554 (541,742) Commercial (multi-family) mortgage-backed securities 14,505 (626) — — 14,505 (626) Collateralized mortgage obligations 16,384 (81) 69,273 (18,705) 85,657 (18,786) Total available-for-sale securities $ 1,390,314 $ (20,545) $ 2,808,442 $ (557,581) $ 4,198,756 $ (578,126) (1) None of our mortgage-backed securities are subprime.
Schedule of Gross Gains and Gross Losses Realized and Impairment on 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 June 30, Six months ended June 30, (In thousands) 2024 2023 2024 2023 Realized gains on investment securities $ 1,325 $ 6 $ 2,360 $ 611 Realized losses on investment securities (21) (6) (129) (51) Net realized gains on investment securities 1,304 0 2,231 560 Unrealized gains on equity securities with readily determinable fair value 74 684 1,108 2,974 Unrealized losses on equity securities with readily determinable fair value (1,931) (684) (2,564) (2,136) Net unrealized (losses) gains on equity securities with readily determinable fair value (1,857) 0 (1,456) 838 Impairment of equity securities without readily determinable fair values (3,729) — (3,731) — (Losses) gains on investment securities, net $ (4,282) $ 0 $ (2,956) $ 1,398
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 June 30, 2024, December 31, 2023 and June 30, 2023, 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: June 30, 2024 December 31, 2023 June 30, 2023 (In thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities Due in one year or less $ 145,856 $ 145,599 $ 53,162 $ 52,945 $ 93,724 $ 93,137 Due in one to five years 139,409 131,506 132,348 123,985 138,704 126,776 Due in five to ten years 84,756 79,216 82,040 76,869 41,655 36,315 Due after ten years 19,043 16,166 18,705 15,782 64,452 57,518 Mortgage-backed 4,517,626 3,957,470 3,693,559 3,233,334 3,680,316 3,178,735 Total available-for-sale securities $ 4,906,690 $ 4,329,957 $ 3,979,814 $ 3,502,915 $ 4,018,851 $ 3,492,481 Held-to-maturity securities Due in one year or less $ 8,356 $ 8,213 $ 5,169 $ 5,142 $ 2,479 $ 2,475 Due in one to five years 114,457 109,845 109,602 105,835 102,182 96,806 Due in five to ten years 85,507 82,499 99,700 98,718 106,708 105,054 Due after ten years 351,737 278,727 352,474 283,506 362,252 289,426 Mortgage-backed 3,196,358 2,581,183 3,290,318 2,722,267 2,991,258 2,394,130 Total held-to-maturity securities $ 3,756,415 $ 3,060,467 $ 3,857,263 $ 3,215,468 $ 3,564,879 $ 2,887,891 Less: Allowance for credit losses (491) (347) (406) Held-to-maturity securities, net of allowance for credit losses $ 3,755,924 $ 3,856,916 $ 3,564,473

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2024
Receivables [Abstract]
Schedule of Loan Portfolio	The following table shows the Company’s loan portfolio by category as of the dates shown: June 30, December 31, June 30, (Dollars in thousands) 2024 2023 2023 Balance: Commercial $ 14,154,462 $ 12,832,053 $ 12,600,471 Commercial real estate 11,947,197 11,344,164 10,608,811 Home equity 356,313 343,976 336,974 Residential real estate 3,067,335 2,769,666 2,643,240 Premium finance receivables—property & casualty 7,100,753 6,903,529 6,762,698 Premium finance receivables—life insurance 7,962,115 7,877,943 8,039,273 Consumer and other 87,356 60,500 31,941 Total loans, net of unearned income $ 44,675,531 $ 42,131,831 $ 41,023,408 Mix: Commercial 31 % 30 % 31 % Commercial real estate 27 27 26 Home equity 1 1 1 Residential real estate 7 7 6 Premium finance receivables—property & casualty 16 16 16 Premium finance receivables—life insurance 18 19 20 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)	6 Months Ended
	Jun. 30, 2024
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 June 30, 2024, December 31, 2023 and June 30, 2023: As of June 30, 2024 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 $ 51,087 $ 304 $ 16,485 $ 36,358 $ 14,050,228 $ 14,154,462 Commercial real estate Construction and development 2,528 — 1,699 6,539 2,249,785 2,260,551 Non-construction 45,761 — 4,856 31,526 9,604,503 9,686,646 Home equity 1,100 — 275 1,229 353,709 356,313 Residential real estate, excluding early buy-out loans 18,198 — 1,977 130 2,912,852 2,933,157 Premium finance receivables Property and casualty insurance loans 32,722 22,427 29,925 45,927 6,969,752 7,100,753 Life insurance loans — — 4,118 17,693 7,940,304 7,962,115 Consumer and other 3 121 81 366 86,785 87,356 Total loans, net of unearned income, excluding early buy-out loans $ 151,399 $ 22,852 $ 59,416 $ 139,768 $ 44,167,918 $ 44,541,353 Early buy-out loans guaranteed by U.S. government agencies (1) — 45,788 — — 88,390 134,178 Total loans, net of unearned income $ 151,399 $ 68,640 $ 59,416 $ 139,768 $ 44,256,308 $ 44,675,531 As of December 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 $ 38,940 $ 98 $ 19,488 $ 85,743 $ 12,687,784 $ 12,832,053 Commercial real estate Construction and development 2,205 — 251 1,343 2,080,242 2,084,041 Non-construction 33,254 — 8,264 19,291 9,199,314 9,260,123 Home equity 1,341 — 62 2,263 340,310 343,976 Residential real estate, excluding early buy-out loans 15,391 — 2,325 22,942 2,578,425 2,619,083 Premium finance receivables Property and casualty insurance loans 27,590 20,135 23,236 50,437 6,782,131 6,903,529 Life insurance loans — — 16,206 45,464 7,816,273 7,877,943 Consumer and other 22 54 25 165 60,234 60,500 Total loans, net of unearned income, excluding early buy-out loans $ 118,743 $ 20,287 $ 69,857 $ 227,648 $ 41,544,713 $ 41,981,248 Early buy-out loans guaranteed by U.S. government agencies (1) — 57,688 250 328 92,317 150,583 Total loans, net of unearned income $ 118,743 $ 77,975 $ 70,107 $ 227,976 $ 41,637,030 $ 42,131,831 (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 June 30, 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 $ 40,460 $ 573 $ 22,808 $ 48,970 $ 12,487,660 $ 12,600,471 Commercial real estate Construction and development 12,536 — — 766 1,747,134 1,760,436 Non-construction 5,947 — 1,054 13,452 8,827,922 8,848,375 Home equity 1,361 110 316 601 334,586 336,974 Residential real estate, excluding early buy-out loans 13,652 — 7,243 872 2,433,625 2,455,392 Premium finance receivables Property and casualty insurance loans 19,583 12,785 22,670 32,751 6,674,909 6,762,698 Life insurance loans 6 1,667 3,729 90,117 7,943,754 8,039,273 Consumer and other 4 28 51 146 31,712 31,941 Total loans, net of unearned income, excluding early buy-out loans $ 93,549 $ 15,163 $ 57,871 $ 187,675 $ 40,481,302 $ 40,835,560 Early buy-out loans guaranteed by U.S. government agencies (1) 117 57,728 918 — 129,085 187,848 Total loans, net of unearned income $ 93,666 $ 72,891 $ 58,789 $ 187,675 $ 40,610,387 $ 41,023,408 (1)
Schedule 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 June 30, 2024: Year of Origination Revolving Total (In thousands) 2024 2023 2022 2021 2020 Prior Revolving to Term Loans Loan Balances: Commercial, industrial and other Pass $ 1,759,369 $ 2,462,832 $ 1,847,769 $ 1,330,074 $ 529,579 $ 1,099,112 $ 4,405,035 $ 8,966 $ 13,442,736 Special mention 1,704 62,567 69,016 64,001 6,033 51,135 129,899 1,300 385,655 Substandard accrual 2,660 41,267 42,882 40,319 20,026 8,703 119,110 17 274,984 Substandard nonaccrual/doubtful — 5,950 5,718 21,951 1,237 8,175 7,976 80 51,087 Total commercial, industrial and other $ 1,763,733 $ 2,572,616 $ 1,965,385 $ 1,456,345 $ 556,875 $ 1,167,125 $ 4,662,020 $ 10,363 $ 14,154,462 Construction and development Pass $ 78,100 $ 475,118 $ 973,989 $ 371,090 $ 79,439 $ 159,686 $ 22,350 $ — $ 2,159,772 Special mention — 1,176 14,990 17,091 — 14,969 — — 48,226 Substandard accrual — — — 1,102 1,777 47,146 — — 50,025 Substandard nonaccrual/doubtful — 495 — — 2,033 — — — 2,528 Total construction and development $ 78,100 $ 476,789 $ 988,979 $ 389,283 $ 83,249 $ 221,801 $ 22,350 $ — $ 2,260,551 Non-construction Pass $ 710,843 $ 1,515,024 $ 1,757,491 $ 1,360,084 $ 961,509 $ 2,884,404 $ 198,713 $ 265 $ 9,388,333 Special mention 3,364 8,422 37,904 46,765 17,230 46,738 274 — 160,697 Substandard accrual — 3,202 13,696 9,545 22,983 42,429 — — 91,855 Substandard nonaccrual/doubtful — 1,372 453 170 — 43,766 — — 45,761 Total non-construction $ 714,207 $ 1,528,020 $ 1,809,544 $ 1,416,564 $ 1,001,722 $ 3,017,337 $ 198,987 $ 265 $ 9,686,646 Home equity Pass $ — $ — $ — $ — $ — $ 9,272 $ 326,705 $ 2,737 $ 338,714 Special mention — — 222 59 120 2,417 6,313 287 9,418 Substandard accrual — — 104 — 102 6,242 558 75 7,081 Substandard nonaccrual/doubtful — — 511 137 — 363 — 89 1,100 Total home equity $ — $ — $ 837 $ 196 $ 222 $ 18,294 $ 333,576 $ 3,188 $ 356,313 Residential real estate Early buy-out loans guaranteed by U.S. government agencies $ — $ 3,762 $ 3,381 $ 3,813 $ 5,700 $ 117,522 $ — $ — $ 134,178 Pass 380,670 480,911 808,108 754,489 204,797 257,334 — — 2,886,309 Special mention — 2,985 5,655 2,284 1,604 6,547 — — 19,075 Substandard accrual 224 596 3,353 915 1,143 3,344 — — 9,575 Substandard nonaccrual/doubtful — 523 5,109 4,642 1,229 6,695 — — 18,198 Total residential real estate $ 380,894 $ 488,777 $ 825,606 $ 766,143 $ 214,473 $ 391,442 $ — $ — $ 3,067,335 Premium finance receivables - property and casualty Pass $ 5,737,826 $ 1,204,432 $ — $ 8,281 $ 421 $ — $ — $ — $ 6,950,960 Special mention 92,231 19,192 95 8 — — — — 111,526 Substandard accrual 1,488 4,052 1 4 — — — — 5,545 Substandard nonaccrual/doubtful 7,238 25,281 182 19 2 — — — 32,722 Total premium finance receivables - property and casualty $ 5,838,783 $ 1,252,957 $ 278 $ 8,312 $ 423 $ — $ — $ — $ 7,100,753 Premium finance receivables - life Pass $ 1,137,551 $ 6,820,635 $ 3,929 $ — $ — $ — $ — $ — $ 7,962,115 Special mention — — — — — — — — — Substandard accrual — — — — — — — — — Substandard nonaccrual/doubtful — — — — — — — — — Total premium finance receivables - life $ 1,137,551 $ 6,820,635 $ 3,929 $ — $ — $ — $ — $ — $ 7,962,115 Consumer and other Pass $ 1,562 $ 2,602 $ 749 $ 667 $ 46 $ 32,764 $ 48,721 $ — $ 87,111 Special mention 6 14 11 5 — 140 2 — 178 Substandard accrual 5 14 9 — — 27 9 — 64 Substandard nonaccrual/doubtful — — 1 2 — — — — 3 Total consumer and other $ 1,573 $ 2,630 $ 770 $ 674 $ 46 $ 32,931 $ 48,732 $ — $ 87,356 Total loans Early buy-out loans guaranteed by U.S. government agencies $ — $ 3,762 $ 3,381 $ 3,813 $ 5,700 $ 117,522 $ — $ — $ 134,178 Pass 9,805,921 12,961,554 5,392,035 3,824,685 1,775,791 4,442,572 5,001,524 11,968 43,216,050 Special mention 97,305 94,356 127,893 130,213 24,987 121,946 136,488 1,587 734,775 Substandard accrual 4,377 49,131 60,045 51,885 46,031 107,891 119,677 92 439,129 Substandard nonaccrual/doubtful 7,238 33,621 11,974 26,921 4,501 58,999 7,976 169 151,399 Total loans $ 9,914,841 $ 13,142,424 $ 5,595,328 $ 4,037,517 $ 1,857,010 $ 4,848,930 $ 5,265,665 $ 13,816 $ 44,675,531 Gross write offs Six months ended June 30, 2024 244 29,608 3,464 1,220 2,088 21,973 — — 58,597
Schedule of 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 June 30, 2024 Year of Origination Total (In thousands) 2024 2023 2022 2021 2020 Prior Balance Amortized Cost Balances: U.S. government agencies 1-4 internal grade $ — $ — $ 156,875 $ 147,815 $ 25,000 $ 6,768 $ 336,458 5-7 internal grade — 8-10 internal grade — Total U.S. government agencies $ — $ — $ 156,875 $ 147,815 $ 25,000 $ 6,768 $ 336,458 Municipal 1-4 internal grade $ — $ 4,176 $ 1,035 $ 6,862 $ 258 $ 151,716 $ 164,047 5-7 internal grade — — — — — 2,353 2,353 8-10 internal grade — Total municipal $ — $ 4,176 $ 1,035 $ 6,862 $ 258 $ 154,069 $ 166,400 Mortgage-backed securities 1-4 internal grade $ — $ 362,988 $ 555,653 $ 2,277,717 $ — $ — $ 3,196,358 5-7 internal grade — 8-10 internal grade — Total mortgage-backed securities $ — $ 362,988 $ 555,653 $ 2,277,717 $ — $ — $ 3,196,358 Corporate notes 1-4 internal grade $ — $ — $ 14,968 $ — $ 6,005 $ 36,226 $ 57,199 5-7 internal grade — 8-10 internal grade — Total corporate notes $ — $ — $ 14,968 $ — $ 6,005 $ 36,226 $ 57,199 Total held-to-maturity securities $ 3,756,415 Less: Allowance for credit losses (491) Held-to-maturity securities, net of allowance for credit losses $ 3,755,924
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. June 30, December 31, June 30, (In thousands) 2024 2023 2023 Allowance for loan losses $ 363,719 $ 344,235 $ 302,499 Allowance for unfunded lending-related commitments losses 73,350 83,030 84,881 Allowance for loan losses and unfunded lending-related commitments losses 437,069 427,265 387,380 Allowance for held-to-maturity securities losses 491 347 406 Allowance for credit losses $ 437,560 $ 427,612 $ 387,786
Schedule 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 six months ended June 30, 2024 and June 30, 2023 is as follows: Three months ended June 30, 2024 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 $ 166,518 $ 226,052 $ 7,191 $ 13,701 $ 13,330 $ 383 $ 427,175 Other adjustments — — — — (19) — (19) Charge-offs (9,584) (15,526) — (23) (9,486) (137) (34,756) Recoveries 950 90 35 8 3,663 24 4,770 Provision for credit losses 24,107 13,112 16 (4,913) 7,258 319 39,899 Allowance for credit losses at period end $ 181,991 $ 223,728 $ 7,242 $ 8,773 $ 14,746 $ 589 $ 437,069 By measurement method: Individually measured $ 30,927 $ 6,330 $ — $ 32 $ — $ 1 $ 37,290 Collectively measured 151,064 217,398 7,242 8,741 14,746 588 399,779 Loans at period end Individually measured $ 51,087 $ 48,289 $ 1,100 $ 17,807 $ — $ 3 $ 118,286 Collectively measured 14,103,375 11,898,908 355,213 2,913,694 15,062,868 87,353 44,421,411 Loans held at fair value — — — 135,834 — — 135,834 Three months ended June 30, 2023 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 $ 149,501 $ 194,780 $ 7,728 $ 11,434 $ 11,955 $ 400 $ 375,798 Other adjustments — — — — 41 — 41 Charge-offs (5,629) (8,124) — — (4,653) (110) (18,516) Recoveries 505 25 37 6 890 23 1,486 Provision for credit losses (1,235) 29,015 (798) 812 813 (36) 28,571 Allowance for credit losses at period end $ 143,142 $ 215,696 $ 6,967 $ 12,252 $ 9,046 $ 277 $ 387,380 By measurement method: Individually measured $ 7,205 $ 5,819 $ — $ 106 $ — $ — $ 13,130 Collectively measured 135,937 209,877 6,967 12,146 9,046 277 374,250 Loans at period end Individually measured $ 40,460 $ 18,483 $ 1,361 $ 13,496 $ — $ 4 $ 73,804 Collectively measured 12,560,011 10,590,328 335,613 2,429,297 14,801,971 31,937 40,749,157 Loans held at fair value — — — 200,447 — — 200,447 Six months ended June 30, 2024 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 $ 169,604 $ 223,853 $ 7,116 $ 13,133 $ 13,069 $ 490 $ 427,265 Other adjustments — — — — (50) — (50) Charge-offs (20,799) (20,995) (74) (61) (16,424) (244) (58,597) Recoveries 1,429 121 64 10 5,190 47 6,861 Provision for credit losses 31,757 20,749 136 (4,309) 12,961 296 61,590 Allowance for credit losses at period end $ 181,991 $ 223,728 $ 7,242 $ 8,773 $ 14,746 $ 589 $ 437,069 Six months ended June 30, 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 2016-13 111 1,356 (33) (692) — (1) 741 Other adjustments — — — — 45 — 45 Charge-offs (8,172) (8,129) — — (9,303) (263) (25,867) Recoveries 897 125 72 10 2,213 55 3,372 Provision for credit losses 7,537 37,992 (645) 1,349 5,420 (12) 51,641 Allowance for credit losses at period end $ 143,142 $ 215,696 $ 6,967 $ 12,252 $ 9,046 $ 277 $ 387,380
Schedule of Modification of Loans	The tables below presents a summary of the period-end balance of loans to borrowers experiencing financial difficulties during the three and six months ended June 30, 2024 and 2023: Three Months Ended June 30, 2024 (Dollars in thousands) Total Percentage of Total Class of Loan Extension of Term Reduction of Interest Only Delay in Contractual Payments Extension of Term and Reduction of Interest Rate Commercial Commercial, industrial and other $ 2,161 0.0 % $ 2,010 $ — $ — $ 97 $ 54 Commercial real estate Non-construction 340 0.0 21 — 319 — — Home equity — — — — — — — Residential real estate 81 0.0 81 — — — — Premium finance receivables Property and casualty insurance loans 6 0.0 3 3 — — — Total loans $ 2,588 0.0 % $ 2,115 $ 3 $ 319 $ 97 $ 54 Weighted Average Magnitude of Modifications: Three Months Ended June 30, 2024 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 2,161 5 143 34 Commercial real estate Non-construction 340 13 — — Home equity — — — — Residential real estate 81 12 — — Premium finance receivables Property and casualty insurance loans 6 2 86 — Total loans $ 2,588 7 140 34 Three Months Ended June 30, 2023 (Dollars in thousands) Total Percentage of Total Class of Loan Extension of Reduction of Delay in Contractual Payments Extension of Commercial Commercial, industrial and other $ 423 0.0 % $ — $ — $ — $ 423 Commercial real estate Non-construction 4,376 0.0 — — — 4,376 Home equity — — — — — — Residential real estate 264 0.0 143 — — 121 Premium finance receivables Property and casualty insurance loans — — — — — — Total loans $ 5,063 0.0 % $ 143 $ — $ — $ 4,920 Weighted Average Magnitude of Modifications: Three Months Ended June 30, 2023 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 423 41 144 — Commercial real estate Non-construction 4,376 39 212 — Home equity — — — — Residential real estate 264 123 262 — Premium finance receivables Property and casualty insurance loans — — — — Total loans $ 5,063 43 207 — Six Months Ended June 30, 2024 (Dollars in thousands) Total (1) Percentage of Total Class of Loan Extension of Term (1) Reduction of Interest Rate (1) Interest Only Delay in Contractual Payments (1) Extension of Term and Reduction of Interest Rate (1) Commercial Commercial, industrial and other $ 3,219 0.0 % $ 2,956 $ — $ — $ 97 $ 166 Commercial real estate Non-construction 1,469 0.0 293 — 319 857 — Home equity 89 0.0 89 — — — — Residential real estate 282 0.0 114 168 — — — Premium finance receivables Property and casualty insurance loans 6 0.0 3 3 — — — Total loans $ 5,065 0.0 % $ 3,455 $ 171 $ 319 $ 954 $ 166 Weighted Average Magnitude of Modifications: Six Months Ended June 30, 2024 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 3,219 8 113 34 Commercial real estate Non-construction 1,469 29 — 16 Home equity 89 12 — — Residential real estate 282 19 201 — Premium finance receivables Property and casualty insurance loans 6 2 86 — Total loans $ 5,065 11 156 18 Six Months Ended June 30, 2023 (Dollars in thousands) Total Percentage of Total Class of Loan Extension of Reduction of Delay in Contractual Payments Extension of Commercial Commercial, industrial and other $ 37,897 0.3 % $ 1,938 $ 221 $ 35,265 $ 473 Commercial real estate Non-construction 5,709 0.1 467 827 39 4,376 Home equity 203 0.1 203 — — — Residential real estate 1,972 0.1 1,396 271 — 305 Premium finance receivables Property and casualty insurance loans 11 0.0 3 — — 8 Total loans $ 45,792 0.1 % $ 4,007 $ 1,319 $ 35,304 $ 5,162 Weighted Average Magnitude of Modifications: Six Months Ended June 30, 2023 (Dollars in thousands) Total Duration of Extension of Term (months) Reduction of Duration of Delay in Contractual Payments (months) Commercial Commercial, industrial and other $ 37,897 15 108 16 Commercial real estate Non-construction 5,709 40 232 101 Home equity 203 12 — — Residential real estate 1,972 57 284 — Premium finance receivables Property and casualty insurance loans 11 0 50 — Total loans $ 45,792 36 223 17
Schedule of Loans for Borrowers Experiencing Financial Difficulties Modified	The following table presents a summary of all modified loans for borrowers experiencing financial difficulties and such loans that were in payment default under the restructured terms during the respective periods below: (Dollars in thousands) For the Twelve Months Ended June 30, 2024 Three Months Ended June 30, 2024 Six Months Ended June 30, 2024 For the Six Months Ended June 30, 2023 Three Months Ended June 30, 2023 Six Months Ended June 30, 2023 Total Payments in Default (1) Payments in Default (1) Total Payments in Default (1) Payments in Default (1) Commercial Commercial, industrial and other $ 4,685 $ 1,784 $ 1,784 $ 37,897 $ 18,729 $ 18,729 Commercial real estate Construction and development 2,486 — — — — — Non-construction 2,644 639 2,443 5,709 923 923 Home equity 586 — — 203 203 203 Residential real estate 417 384 384 1,972 541 541 Premium finance receivables Property and casualty insurance loans 18 14 14 11 11 11 Total loans $ 10,836 $ 2,821 $ 4,625 $ 45,792 $ 20,407 $ 20,407 (1) Modified loans considered to be in payment default are over 30 days past due subsequent to the restructuring.

Goodwill and Other Acquisitio_2

Goodwill and Other Acquisition-Related Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of 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, 2023 Goodwill Impairment Goodwill Adjustments June 30, Community banking $ 545,671 $ — $ — $ — $ 545,671 Specialty finance 39,006 — — (717) 38,289 Wealth management 71,995 — — — 71,995 Total $ 656,672 $ — $ — $ (717) $ 655,955
Schedule of Indefinite-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 June 30, 2024 is as follows: (In thousands) June 30, December 31, June 30, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,206 $ 55,206 $ 55,206 Accumulated amortization (47,666) (46,125) (44,432) Net carrying amount $ 7,540 $ 9,081 $ 10,774 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 13,340 $ 14,881 $ 16,574 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,961 $ 1,963 $ 1,963 Accumulated amortization (1,861) (1,837) (1,813) Net carrying amount $ 100 $ 126 $ 150 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 26,630 $ 26,630 $ 26,630 Accumulated amortization (19,463) (18,748) (17,701) Net carrying amount $ 7,167 $ 7,882 $ 8,929 Total acquisition-related intangible assets: Gross carrying amount $ 89,597 $ 89,599 $ 89,599 Accumulated amortization (68,990) (66,710) (63,946) Total other acquisition-related intangible assets, net $ 20,607 $ 22,889 $ 25,653
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 June 30, 2024 is as follows: (In thousands) June 30, December 31, June 30, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,206 $ 55,206 $ 55,206 Accumulated amortization (47,666) (46,125) (44,432) Net carrying amount $ 7,540 $ 9,081 $ 10,774 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 13,340 $ 14,881 $ 16,574 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,961 $ 1,963 $ 1,963 Accumulated amortization (1,861) (1,837) (1,813) Net carrying amount $ 100 $ 126 $ 150 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 26,630 $ 26,630 $ 26,630 Accumulated amortization (19,463) (18,748) (17,701) Net carrying amount $ 7,167 $ 7,882 $ 8,929 Total acquisition-related intangible assets: Gross carrying amount $ 89,597 $ 89,599 $ 89,599 Accumulated amortization (68,990) (66,710) (63,946) Total other acquisition-related intangible assets, net $ 20,607 $ 22,889 $ 25,653
Schedule of Estimated Amortization	Estimated amortization Actual in six months ended June 30, 2024 $ 2,280 Estimated remaining in 2024 2,021 Estimated—2025 3,482 Estimated—2026 2,772 Estimated—2027 2,156 Estimated—2028 1,591

Mortgage Servicing Rights ("M_2

Mortgage Servicing Rights ("MSRs") (Tables)	6 Months Ended
	Jun. 30, 2024
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Schedule of Changes in the Carrying Value of 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 Six Months Ended June 30, June 30, June 30, June 30, (In thousands) 2024 2023 2024 2023 Fair value at beginning of the period $ 201,044 $ 224,470 $ 192,456 $ 230,225 Additions from loans sold with servicing retained 8,223 8,720 13,602 13,827 Servicing rights sold — (30,170) — (30,170) Estimate of changes in fair value due to: Payoffs, paydowns and repurchases (5,534) (5,043) (9,920) (8,952) Changes in valuation inputs or assumptions 877 2,715 8,472 (4,238) Fair value at end of the period $ 204,610 $ 200,692 $ 204,610 $ 200,692 Unpaid principal balance of mortgage loans serviced for others $ 12,211,027 $ 11,752,223

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2024
Deposits [Abstract]
Schedule of Deposits	The following table is a summary of deposits as of the dates shown: (Dollars in thousands) June 30, December 31, June 30, Balance: Non-interest-bearing $ 10,031,440 $ 10,420,401 $ 10,604,915 NOW and interest-bearing demand deposits 5,053,909 5,797,649 5,814,836 Wealth management deposits 1,490,711 1,614,499 1,417,984 Money market 16,320,017 15,149,215 14,523,124 Savings 5,882,179 5,790,334 5,321,578 Time certificates of deposit 9,270,770 6,625,072 6,356,270 Total deposits $ 48,049,026 $ 45,397,170 $ 44,038,707 Mix: Non-interest-bearing 21 % 23 % 24 % NOW and interest-bearing demand deposits 11 13 13 Wealth management deposits 3 4 3 Money market 34 33 33 Savings 12 13 12 Time certificates of deposit 19 14 15 Total deposits 100 % 100 % 100 %

FHLB Advances, Other Borrowin_2

FHLB Advances, Other Borrowings and Subordinated Notes (Tables)	6 Months Ended
	Jun. 30, 2024
Debt Disclosure [Abstract]
Schedule of 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) June 30, December 31, June 30, FHLB advances $ 3,176,309 $ 2,326,071 $ 2,026,071 Other borrowings: Notes payable 157,024 171,282 185,539 Short-term borrowings — 13,430 17,773 Secured borrowings 391,395 401,897 401,669 Other 58,160 59,204 60,238 Total other borrowings 606,579 645,813 665,219 Subordinated notes 298,113 437,866 437,628 Total FHLB advances, other borrowings and subordinated notes $ 4,081,001 $ 3,409,750 $ 3,128,918

Junior Subordinated Debentures

Junior Subordinated Debentures (Tables)	6 Months Ended
	Jun. 30, 2024
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Schedule of Junior Subordinated Debentures	The following table provides a summary of the Company’s junior subordinated debentures as of June 30, 2024. The junior subordinated debentures represent the par value of the obligations owed to the Trusts. (Dollars in thousands) Common Trust Junior Rate Structure (1) Contractual Rate at 6/30/2024 Issue Maturity Earliest Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 S+0.26161+3.25 8.84 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 S+0.26161+2.80 8.39 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 S+0.26161+2.60 8.19 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 S+0.26161+1.95 7.55 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 S+0.26161+1.45 7.04 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 S+0.26161+1.63 7.23 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 S+0.26161+3.00 8.59 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 S+0.26161+3.00 8.59 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 S+0.26161+3.00 8.59 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 S+0.26161+1.75 7.35 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 S+0.26161+1.62 7.22 % 06/2007 09/2037 06/2012 Total $ 253,566 7.79 % (1) The interest rates on the variable rate junior subordinated debentures are based on the three-month Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR”) and reset on a quarterly basis.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Schedule of Operating Information for Reportable Segments	The following is a summary of certain operating information for reportable segments: Three Months Ended $ Change in % Change in (Dollars in thousands) June 30, June 30, Net interest income: Community Banking $ 358,832 $ 346,232 $ 12,600 4 % Specialty Finance 95,191 84,993 10,198 12 Wealth Management 7,928 7,404 524 7 Total Operating Segments 461,951 438,629 23,322 5 Intersegment Eliminations 8,659 8,908 (249) (3) Consolidated net interest income $ 470,610 $ 447,537 $ 23,073 5 % Provision for credit losses: Community Banking $ 36,325 $ 26,713 $ 9,612 36 % Specialty Finance 3,736 1,801 1,935 107 Wealth Management — — — — Total Operating Segments 40,061 28,514 11,547 40 Intersegment Eliminations — — — — Consolidated provision for credit losses $ 40,061 $ 28,514 $ 11,547 40 % Non-interest income: Community Banking $ 71,619 $ 68,130 $ 3,489 5 % Specialty Finance 32,317 31,737 580 2 Wealth Management 35,605 33,391 2,214 7 Total Operating Segments 139,541 133,258 6,283 5 Intersegment Eliminations (18,394) (20,228) 1,834 (9) Consolidated non-interest income $ 121,147 $ 113,030 $ 8,117 7 % Net revenue: Community Banking $ 430,451 $ 414,362 $ 16,089 4 % Specialty Finance 127,508 116,730 10,778 9 Wealth Management 43,533 40,795 2,738 7 Total Operating Segments 601,492 571,887 29,605 5 Intersegment Eliminations (9,735) (11,320) 1,585 (14) Consolidated net revenue $ 591,757 $ 560,567 $ 31,190 6 % Segment profit: Community Banking $ 91,235 $ 102,517 $ (11,282) (11) % Specialty Finance 53,091 46,402 6,689 14 Wealth Management 8,062 5,831 2,231 38 Consolidated net income $ 152,388 $ 154,750 $ (2,362) (2) % Segment assets: Community Banking $ 47,611,508 $ 42,452,673 $ 5,158,835 12 % Specialty Finance 11,014,840 10,549,819 465,021 4 Wealth Management 1,155,168 1,283,684 (128,516) (10) Consolidated total assets $ 59,781,516 $ 54,286,176 $ 5,495,340 10 % NM - Not meaningful Six Months Ended $ Change in % Change in (Dollars in thousands) June 30, June 30, Net interest income: Community Banking $ 722,517 $ 716,080 $ 6,437 1 % Specialty Finance 177,473 155,344 22,129 14 Wealth Management 15,686 16,359 (673) (4) Total Operating Segments 915,676 887,783 27,893 3 Intersegment Eliminations 19,128 17,749 1,379 8 Consolidated net interest income $ 934,804 $ 905,532 $ 29,272 3 % Provision for credit losses: Community Banking $ 56,717 $ 47,812 $ 8,905 19 % Specialty Finance 5,017 3,747 1,270 34 Wealth Management — — — — Total Operating Segments 61,734 51,559 10,175 20 Intersegment Eliminations — — — — Consolidated provision for credit losses $ 61,734 $ 51,559 $ 10,175 20 % Non-interest income: Community Banking $ 146,255 $ 136,863 $ 9,392 7 % Specialty Finance 59,634 57,527 2,107 4 Wealth Management 94,090 63,688 30,402 48 Total Operating Segments 299,979 258,078 41,901 16 Intersegment Eliminations (38,252) (37,279) (973) 3 Consolidated non-interest income $ 261,727 $ 220,799 $ 40,928 19 % Net revenue: Community Banking $ 868,772 $ 852,943 $ 15,829 2 % Specialty Finance 237,107 212,871 24,236 11 Wealth Management 109,776 80,047 29,729 37 Total Operating Segments 1,215,655 1,145,861 69,794 6 Intersegment Eliminations (19,124) (19,530) 406 (2) Consolidated net revenue $ 1,196,531 $ 1,126,331 $ 70,200 6 % Segment profit: Community Banking $ 211,282 $ 236,749 $ (25,467) 12 % Specialty Finance 95,614 83,139 12,475 4 Wealth Management 32,786 15,060 17,726 (10) Consolidated net income $ 339,682 $ 334,948 $ 4,734 10 % NM - Not meaningful

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2024
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 June 30, 2024, December 31, 2023 and June 30, 2023: Derivative Assets Derivative Liabilities (In thousands) June 30, December 31, June 30, June 30, December 31, June 30, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ 7,532 $ 40,116 $ 2,154 $ 96,825 $ 44,456 $ 121,347 Interest rate derivatives designated as Fair Value Hedges 12,678 12,349 16,255 — 273 — Total derivatives designated as hedging instruments under ASC 815 $ 20,210 $ 52,465 $ 18,409 $ 96,825 $ 44,729 $ 121,347 Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 215,275 $ 211,490 $ 261,205 $ 217,157 $ 210,397 $ 261,066 Interest rate lock commitments 4,795 4,511 3,487 67 — 172 Forward commitments to sell mortgage loans 102 — 2,769 597 5,212 38 Commodity forward contracts 702 888 434 304 609 214 Foreign exchange contracts 2,776 6,372 8,444 2,709 6,308 8,335 Total derivatives not designated as hedging instruments under ASC 815 $ 223,650 $ 223,261 $ 276,339 $ 220,834 $ 222,526 $ 269,825 Total Derivatives $ 243,860 $ 275,726 $ 294,748 $ 317,659 $ 267,255 $ 391,172
Schedule of Cash Flow Hedging Instruments	The table below provides details on these cash flow hedges, summarized by derivative type and maturity, as of June 30, 2024: June 30, 2024 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 $ (16,589) Buy 2.750% floor, sell 4.320% cap; matures October 2026 500,000 (4,740) Buy 2.000% floor, sell 3.450% cap; matures September 2027 1,250,000 (37,289) Interest Rate Swaps at 1-month CME term SOFR: Fixed 3.748%; matures December 2025 250,000 (3,114) Fixed 3.759%; matures December 2025 250,000 (3,075) Fixed 3.680%; matures February 2026 250,000 (3,735) Fixed 4.176%; matures March 2026 250,000 (1,773) Fixed 3.915%; matures March 2026 250,000 (2,826) Fixed 4.450%; matures July 2026 250,000 (206) Fixed 3.515%, matures December 2026 250,000 (4,597) Fixed 3.512%; matures December 2026 250,000 (4,614) Fixed 3.453%; matures February 2027 250,000 (5,369) Fixed 4.150%; matures July 2027 250,000 (591) Fixed 3.748%; matures March 2028 250,000 (3,203) Fixed 3.526%; matures March 2028 250,000 (5,104) Fixed 3.993%; matures October 2029 100,000 444 Fixed 3.993%; matures October 2029 250,000 1,111 Fixed 4.245%; matures November 2029 175,000 2,988 Fixed 4.245%; matures November 2029 175,000 2,988 Total Cash Flow Hedges $ 6,700,000 $ (89,294)
Schedule 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 Six Months Ended (In thousands) June 30, June 30, June 30, June 30, Unrealized gain at beginning of period $ (38,553) $ 44,692 $ 43,538 $ 10,026 Amount reclassified from accumulated other comprehensive income or loss to interest income or expense on deposits, loans, and other borrowings 20,524 14,267 40,342 18,014 Amount of loss recognized in other comprehensive income or loss (31,367) (120,698) (133,276) (89,779) Unrealized (loss) gain at end of period $ (49,396) $ (61,739) $ (49,396) $ (61,739)
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 June 30, 2024: (In thousands) June 30, 2024 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 $ 199,732 $ (12,684) $ (69) Available-for-sale debt securities 672 (18) — 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 Six Months Ended June 30, 2024 June 30, 2024 Interest rate swaps Interest and fees on loans $ (16) $ (6) Interest income - investment securities — —
Schedule of 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 Six Months Ended Derivative Location in income statement June 30, June 30, June 30, June 30, Interest rate swaps and caps Trading gains, net $ (102) $ 12 $ 493 $ 812 Mortgage banking derivatives Mortgage banking revenue 3,721 4,791 3,706 8,431 Commodity contracts Trading gains, net 130 49 398 226 Foreign exchange contracts Trading gains, net 11 — 19 — Covered call options Fees from covered call options 2,056 2,578 6,903 12,969 Derivative contract held as economic hedge on MSRs Mortgage banking revenue (772) (726) (3,349) 220
Schedule of 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) June 30, December 31, June 30, June 30, December 31, June 30, Gross Amounts Recognized $ 235,485 $ 263,955 $ 279,614 $ 313,982 $ 255,126 $ 382,413 Less: Amounts offset in the Statements of Condition — — — — — — Net amount presented in the Statements of Condition $ 235,485 $ 263,955 $ 279,614 $ 313,982 $ 255,126 $ 382,413 Gross amounts not offset in the Statements of Condition Offsetting Derivative Positions (114,662) (76,514) (125,159) (114,662) (76,514) (125,159) Collateral Posted (85,762) (144,899) (145,735) — — — Net Credit Exposure $ 35,061 $ 42,542 $ 8,720 $ 199,320 $ 178,612 $ 257,254
Schedule of 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) June 30, December 31, June 30, June 30, December 31, June 30, Gross Amounts Recognized $ 235,485 $ 263,955 $ 279,614 $ 313,982 $ 255,126 $ 382,413 Less: Amounts offset in the Statements of Condition — — — — — — Net amount presented in the Statements of Condition $ 235,485 $ 263,955 $ 279,614 $ 313,982 $ 255,126 $ 382,413 Gross amounts not offset in the Statements of Condition Offsetting Derivative Positions (114,662) (76,514) (125,159) (114,662) (76,514) (125,159) Collateral Posted (85,762) (144,899) (145,735) — — — Net Credit Exposure $ 35,061 $ 42,542 $ 8,720 $ 199,320 $ 178,612 $ 257,254

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Schedule 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: June 30, 2024 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 102,712 $ 102,712 $ — $ — U.S. government agencies 45,192 — 45,192 — Municipal 146,608 — 50,816 95,792 Corporate notes 77,975 — 77,975 — Mortgage-backed 3,957,470 — 3,957,470 — Trading account securities 4,134 — 4,134 — Equity securities with readily determinable fair value 112,173 104,107 8,066 — Mortgage loans held-for-sale 411,851 — 371,306 40,545 Loans held-for-investment 135,834 — 90,113 45,721 MSRs 204,610 — — 204,610 Nonqualified deferred compensation assets 16,041 — 16,041 — Derivative assets 243,860 — 239,065 4,795 Total $ 5,458,460 $ 206,819 $ 4,860,178 $ 391,463 Derivative liabilities $ 317,659 $ — $ 317,659 $ — December 31, 2023 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 6,968 $ 6,968 $ — $ — U.S. government agencies 45,124 — 45,124 — Municipal 140,958 — 54,721 86,237 Corporate notes 76,531 — 76,531 — Mortgage-backed 3,233,334 — 3,233,334 — Trading account securities 4,707 — 4,707 — Equity securities with readily determinable fair value 139,268 131,202 8,066 — Mortgage loans held-for-sale 292,722 — 265,887 26,835 Loans held-for-investment 155,261 — 94,591 60,670 MSRs 192,456 — — 192,456 Nonqualified deferred compensation assets 15,238 — 15,238 — Derivative assets 275,726 — 271,216 4,510 Total $ 4,578,293 $ 138,170 $ 4,069,415 $ 370,708 Derivative liabilities $ 267,255 $ — $ 267,255 $ — June 30, 2023 (In thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ — $ — $ — $ — U.S. government agencies 74,275 — 74,275 — Municipal 167,411 — 53,256 114,155 Corporate notes 72,060 — 72,060 — Mortgage-backed 3,178,735 — 3,178,735 — Trading account securities 3,027 — 3,027 — Equity securities with readily determinable fair value 116,275 108,209 8,066 — Mortgage loans held-for-sale 338,728 — 309,322 29,406 Loans held-for-investment 193,953 — 132,830 61,123 MSRs 200,692 — — 200,692 Nonqualified deferred compensation assets 14,796 — 14,796 — Derivative assets 294,748 — 291,261 3,487 Total $ 4,654,700 $ 108,209 $ 4,137,628 $ 408,863 Derivative liabilities $ 391,172 $ — $ 391,172 $ —
Schedule 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 and six months ended June 30, 2024 and 2023 are summarized as follows: Mortgage loans held-for-sale Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at April 1, 2024 $ 88,219 $ 33,726 $ 49,317 $ 201,044 $ 6,212 Total net (losses) gains included in: Net income (1) — 205 66 3,566 (1,417) Other comprehensive income or loss (680) — — — — Purchases 9,682 — — — — Settlements (1,429) (10,269) (7,709) — — Net transfers into Level 3 — 16,883 4,047 — — Balance at June 30, 2024 $ 95,792 $ 40,545 $ 45,721 $ 204,610 $ 4,795 Mortgage loans held-for-sale Loans held-for- investment Mortgage Derivative assets (In thousands) Municipal Balance at April 1, 2023 $ 112,257 $ 44,250 $ 69,493 $ 224,470 $ 5,356 Total net (losses) gains included in: Net income (1) — 402 (619) 6,392 (1,869) Other comprehensive income or loss (3,161) — — — — Purchases 6,978 — — — — Sales — — — (30,170) — Settlements (1,919) (23,973) (16,593) — — Net transfers into Level 3 — 8,727 8,842 — — Balance at June 30, 2023 $ 114,155 $ 29,406 $ 61,123 $ 200,692 $ 3,487 (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 Loans held-for- investment Mortgage Derivative Assets (In thousands) Municipal Balance at January 1, 2024 $ 86,237 $ 26,835 $ 60,670 $ 192,456 $ 4,510 Total net (losses) gains included in: Net income (1) — 272 (251) 12,154 285 Other comprehensive income or loss (2,668) — — — — Purchases 18,066 — — — — Issuances — — — — — Sales — — — — — Settlements (5,843) (20,609) (23,512) — — Net transfers into Level 3 — 34,047 8,814 — — Balance at June 30, 2024 $ 95,792 $ 40,545 $ 45,721 $ 204,610 $ 4,795 Mortgage loans held-for-sale 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) — 868 (255) 637 1,776 Other comprehensive income or loss (4,823) — — — — Purchases 11,396 — — — — Sales — — — (30,170) — Settlements (9,955) (42,592) (36,915) — — Net transfers into Level 3 — 22,475 14,128 — — Balance at June 30, 2023 $ 114,155 $ 29,406 $ 61,123 $ 200,692 $ 3,487 (1)
Schedule 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 June 30, 2024: June 30, 2024 Three Months Ended June 30, 2024 Fair Value Losses Recognized, net Six Months Ended June 30, 2024 Fair Value Losses Recognized, net (In thousands) Total Level 1 Level 2 Level 3 Individually assessed loans - foreclosure probable and collateral-dependent $ 118,286 $ — $ — $ 118,286 $ 25,113 $ 41,839 Other real estate owned (1) 19,731 — — 19,731 — 207 Total $ 138,017 $ — $ — $ 138,017 $ 25,113 $ 42,046 (1) Net fair value losses recognized 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 Non Recurring	The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at June 30, 2024 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 $ 95,792 Bond pricing Equivalent rating BBB-AA+ N/A Increase Mortgage loans held-for-sale 40,545 Discounted cash flows Discount rate 6.83% 6.83% Decrease Credit discount 0% - 13% 0.36% Decrease Loans held-for-investment 45,721 Discounted cash flows Discount rate 6.75% - 6.83% 6.83% Decrease Credit discount 0% - 17% 1.10% Decrease Constant prepayment rate (CPR) - current loans 7.86% 7.86% Decrease Average life - delinquent loans (in years) 1.2 years - 10.6 years 5.9 years Decrease MSRs 204,610 Discounted cash flows Discount rate 1% - 36% 10.98% Decrease Constant prepayment rate (CPR) 0% - 90% 7.86% Decrease Cost of servicing $70 - $200 $ 77 Decrease Cost of servicing - delinquent $200 - 1,000 $ 361 Decrease Derivatives 4,795 Discounted cash flows Pull-through rate 4% - 100% 81.17 % Increase Measured at fair value on a non-recurring basis: Individually assessed loans - foreclosure probable and collateral-dependent 118,286 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 19,731 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease
Schedule 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 June 30, 2024 At December 31, 2023 At June 30, 2023 Carrying Fair Carrying Fair Carrying Fair (In thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 415,524 $ 415,524 $ 423,464 $ 423,464 $ 513,917 $ 513,917 Interest-bearing deposits with banks 2,824,314 2,824,314 2,084,323 2,084,323 2,163,708 2,163,708 Available-for-sale securities 4,329,957 4,329,957 3,502,915 3,502,915 3,492,481 3,492,481 Held-to-maturity securities 3,755,924 3,060,467 3,856,916 3,215,468 3,564,473 2,887,891 Trading account securities 4,134 4,134 4,707 4,707 3,027 3,027 Equity securities with readily determinable fair value 112,173 112,173 139,268 139,268 116,275 116,275 FHLB and FRB stock, at cost 256,495 256,495 205,003 205,003 195,117 195,117 Brokerage customer receivables 13,682 13,682 10,592 10,592 15,722 15,722 Mortgage loans held-for-sale, at fair value 411,851 411,851 292,722 292,722 338,728 338,728 Loans held-for-investment, at fair value 135,834 135,834 155,261 155,261 193,953 193,953 Loans held-for-investment, at amortized cost 44,539,697 43,461,319 41,976,570 41,090,010 40,829,455 40,142,976 Nonqualified deferred compensation assets 16,041 16,041 15,238 15,238 14,796 14,796 Derivative assets 243,860 243,860 275,726 275,726 294,748 294,748 Accrued interest receivable and other 505,504 505,504 477,832 477,832 434,553 434,553 Total financial assets $ 57,564,990 $ 55,791,155 $ 53,420,537 $ 51,892,529 $ 52,170,953 $ 50,807,892 Financial Liabilities Non-maturity deposits $ 38,778,256 $ 38,778,256 $ 38,772,098 $ 38,772,098 $ 37,682,437 $ 37,682,437 Time certificates of deposit 9,270,770 9,248,374 6,625,072 6,603,746 6,356,270 6,300,161 FHLB advances 3,176,309 3,195,138 2,326,071 2,367,107 2,026,071 2,072,317 Other borrowings 606,579 605,305 645,813 643,755 665,219 662,156 Subordinated notes 298,113 273,666 437,866 413,501 437,628 405,762 Junior subordinated debentures 253,566 253,571 253,566 253,579 253,566 253,562 Derivative liabilities 317,659 317,659 267,255 267,255 391,172 391,172 Accrued interest payable 66,373 66,373 51,116 51,116 45,359 45,359 Total financial liabilities $ 52,767,625 $ 52,738,342 $ 49,378,857 $ 49,372,157 $ 47,857,722 $ 47,812,926

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Stock Option Activity	A summary of the Plans’ stock option activity for the six months ended June 30, 2024 and June 30, 2023 is presented below: Stock Options Common Weighted Remaining Contractual Term (1) Intrinsic Value (2) (in thousands) Outstanding at January 1, 2024 13,100 $ 42.76 Granted — — Exercised (775) 32.26 Forfeited or canceled — — Outstanding at June 30, 2024 12,325 $ 43.42 4.0 $ 680 Exercisable at June 30, 2024 12,325 $ 43.42 4.0 $ 680 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 June 30, 2023 13,875 $ 42.18 4.5 $ 422 Exercisable at June 30, 2023 13,875 $ 42.18 4.5 $ 422 (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.
Schedule of Plans' Restricted and Performance Share Award Activity	A summary of the Plans’ restricted share activity for the six months ended June 30, 2024 and June 30, 2023 is presented below: Six months ended June 30, 2024 Six months ended June 30, 2023 Restricted Shares Common Weighted Common Weighted Outstanding at January 1 746,123 $ 79.60 610,155 $ 73.21 Granted 389,198 99.50 260,173 88.29 Vested and issued (228,719) 69.54 (103,161) 64.08 Forfeited or canceled (7,893) 91.47 (7,638) 82.82 Outstanding at June 30 898,709 $ 90.68 759,529 $ 79.52 Vested, but deferred, at June 30 99,844 $ 53.98 98,247 $ 53.35 A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the six months ended June 30, 2024 and June 30, 2023 is presented below: Six months ended June 30, 2024 Six months ended June 30, 2023 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 553,026 $ 79.69 545,379 $ 70.30 Granted 96,952 58.78 186,313 92.45 Added by performance factor at vesting 111,304 100.44 23,161 63.64 Vested and issued (295,644) 58.69 (178,203) 63.64 Forfeited or canceled (3,154) 95.94 (7,909) 82.73 Outstanding at June 30 462,484 $ 93.61 568,741 $ 79.20 Vested, but deferred, at June 30 21,593 $ 43.95 36,438 $ 44.99

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Schedule of 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 April 1, 2024 $ (408,002) $ (28,329) $ (48,817) $ (485,148) Other comprehensive loss during the period, net of tax, before reclassifications (15,275) (23,070) (2,905) (41,250) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (885) 15,095 — 14,210 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 (10) — — (10) Net other comprehensive (loss) during the period, net of tax $ (16,170) $ (7,975) $ (2,905) $ (27,050) Balance at June 30, 2024 $ (424,172) $ (36,304) $ (51,722) $ (512,198) Balance at January 1, 2024 $ (350,697) $ 32,049 $ (42,583) $ (361,231) Other comprehensive loss during the period, net of tax, before reclassifications (72,562) (98,024) (9,139) (179,725) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (866) 29,671 — 28,805 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 (47) — — (47) Net other comprehensive loss during the period, net of tax $ (73,475) $ (68,353) $ (9,139) $ (150,967) Balance at June 30, 2024 $ (424,172) $ (36,304) $ (51,722) $ (512,198) Balance at April 1, 2023 $ (351,995) $ 32,809 $ (48,250) $ (367,436) Other comprehensive income during the period, net of tax, before reclassifications (33,909) (88,533) 5,344 (117,098) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (1) 10,465 — 10,464 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 (20) — — (20) Net other comprehensive income during the period, net of tax $ (33,930) $ (78,068) $ 5,344 $ (106,654) Balance at June 30, 2023 $ (385,925) $ (45,259) $ (42,906) $ (474,090) Balance at January 1, 2023 $ (386,057) $ 7,381 $ (48,960) $ (427,636) Other comprehensive loss during the period, net of tax, before reclassifications 594 (65,854) 6,054 (59,206) Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (410) 13,214 — 12,804 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 (52) — — (52) Net other comprehensive loss during the period, net of tax $ 132 $ (52,640) $ 6,054 $ (46,454) Balance at June 30, 2023 $ (385,925) $ (45,259) $ (42,906) $ (474,090)
Schedule of 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 Six Months Ended Impacted Line on the June 30, June 30, 2024 2023 2024 2023 Accumulated unrealized gains on securities Gains included in net income $ 1,204 $ 2 $ 1,178 $ 562 (Losses) gains on investment securities, net 1,204 2 1,178 562 Income before taxes Tax effect (319) (1) (312) (152) Income tax expense Net of tax $ 885 $ 1 $ 866 $ 410 Net income Accumulated unrealized gains on derivative instruments Amount reclassified to interest income on loans $ 23,849 $ 18,661 $ 48,324 $ 27,733 Interest on Loans Amount reclassified to interest expense on deposits $ (3,325) $ (4,657) $ (7,982) $ (10,245) Interest on deposits Amount reclassified to interest expense on other borrowings — 263 — 526 Interest on other borrowings (20,524) (14,267) (40,342) (18,014) Income before taxes Tax effect 5,429 3,802 10,671 4,800 Income tax expense Net of tax $ (15,095) $ (10,465) $ (29,671) $ (13,214) Net income
Schedule of 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 Six Months Ended (Dollars in thousands, except per share data) June 30, June 30, June 30, June 30, Net income $ 152,388 $ 154,750 $ 339,682 $ 334,948 Less: Preferred stock dividends 6,991 6,991 13,982 13,982 Net income applicable to common shares (A) $ 145,397 $ 147,759 $ 325,700 $ 320,966 Weighted average common shares outstanding (B) 61,839 61,192 61,660 61,072 Effect of dilutive potential common shares Common stock equivalents 926 902 901 933 Weighted average common shares and effect of dilutive potential common shares (C) 62,765 62,094 62,561 62,005 Net income per common share: Basic (A/B) $ 2.35 $ 2.41 $ 5.28 $ 5.26 Diluted (A/C) $ 2.32 $ 2.38 $ 5.21 $ 5.18

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Apr. 03, 2023
Business Acquisition [Line Items]
Goodwill	$ 655,955	$ 656,672	$ 656,674
Rothschild & Co Asset Management U.S.
Business Acquisition [Line Items]
Assets acquired in acquisition				$ 12,600
Goodwill				$ 2,600

Investment Securities - Schedul

Investment Securities - Schedule of Investment Securities (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Available-for-sale securities
Amortized Cost	$ 4,906,690,000	$ 3,979,814,000	$ 4,018,851,000
Gross Unrealized Gains	1,393,000	3,525,000	102,000
Gross Unrealized Losses	(578,126,000)	(480,424,000)	(526,472,000)
Fair Value	4,329,957,000	3,502,915,000	3,492,481,000
Held-to-maturity securities
Amortized Cost	3,756,415,000	3,857,263,000	3,564,879,000
Gross Unrealized Gains	517,000	3,472,000	397,000
Gross Unrealized Losses	(696,465,000)	(645,267,000)	(677,385,000)
Fair Value	3,060,467,000	3,215,468,000	2,887,891,000
Less: Allowance for credit losses	(491,000)	(347,000)	(406,000)
Held-to-maturity securities, net of allowance for credit losses	3,755,924,000	3,856,916,000	3,564,473,000
Equity securities with readily determinable fair value
Amortized Cost	117,674,000	143,312,000	120,629,000
Gross Unrealized Gains	2,882,000	3,500,000	3,711,000
Gross Unrealized Losses	(8,383,000)	(7,544,000)	(8,065,000)
Fair Value	112,173,000	139,268,000	116,275,000
U.S. Treasury
Available-for-sale securities
Amortized Cost	102,721,000	6,960,000	0
Gross Unrealized Gains	5,000	8,000	0
Gross Unrealized Losses	(14,000)	0	0
Fair Value	102,712,000	6,968,000	0
U.S. government agencies
Available-for-sale securities
Amortized Cost	50,000,000	50,000,000	80,000,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(4,808,000)	(4,876,000)	(5,725,000)
Fair Value	45,192,000	45,124,000	74,275,000
Held-to-maturity securities
Amortized Cost	336,458,000	336,468,000	339,604,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(70,928,000)	(67,058,000)	(71,022,000)
Fair Value	265,530,000	269,410,000	268,582,000
Municipal
Available-for-sale securities
Amortized Cost	151,347,000	144,299,000	173,540,000
Gross Unrealized Gains	390,000	657,000	102,000
Gross Unrealized Losses	(5,129,000)	(3,998,000)	(6,231,000)
Fair Value	146,608,000	140,958,000	167,411,000
Held-to-maturity securities
Amortized Cost	166,400,000	172,933,000	176,128,000
Gross Unrealized Gains	155,000	565,000	362,000
Gross Unrealized Losses	(6,789,000)	(3,778,000)	(4,502,000)
Fair Value	159,766,000	169,720,000	171,988,000
Corporate notes
Held-to-maturity securities
Amortized Cost	57,199,000	57,544,000	57,889,000
Gross Unrealized Gains	0	7,000	35,000
Gross Unrealized Losses	(3,211,000)	(3,480,000)	(4,733,000)
Fair Value	53,988,000	54,071,000	53,191,000
Financial issuers
Available-for-sale securities
Amortized Cost	83,996,000	83,996,000	83,995,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(7,011,000)	(8,456,000)	(12,920,000)
Fair Value	76,985,000	75,540,000	71,075,000
Other
Available-for-sale securities
Amortized Cost	1,000,000	1,000,000	1,000,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(10,000)	(9,000)	(15,000)
Fair Value	990,000	991,000	985,000
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	4,320,215,000	3,505,012,000	3,585,943,000
Gross Unrealized Gains	361,000	1,392,000	0
Gross Unrealized Losses	(541,742,000)	(446,784,000)	(483,659,000)
Fair Value	3,778,834,000	3,059,620,000	3,102,284,000
Held-to-maturity securities
Amortized Cost	2,962,721,000	3,042,828,000	2,832,138,000
Gross Unrealized Gains	0	1,922,000	0
Gross Unrealized Losses	(591,601,000)	(549,265,000)	(574,114,000)
Fair Value	2,371,120,000	2,495,485,000	2,258,024,000
Commercial (multi-family) mortgage-backed securities
Available-for-sale securities
Amortized Cost	18,096,000	13,201,000
Gross Unrealized Gains	8,000	68,000
Gross Unrealized Losses	(626,000)	(289,000)
Fair Value	17,478,000	12,980,000
Held-to-maturity securities
Amortized Cost	6,390,000	6,415,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(300,000)	(184,000)
Fair Value	6,090,000	6,231,000
Collateralized mortgage obligations
Available-for-sale securities
Amortized Cost	179,315,000	175,346,000	94,373,000
Gross Unrealized Gains	629,000	1,400,000	0
Gross Unrealized Losses	(18,786,000)	(16,012,000)	(17,922,000)
Fair Value	161,158,000	160,734,000	76,451,000
Held-to-maturity securities
Amortized Cost	227,247,000	241,075,000	159,120,000
Gross Unrealized Gains	362,000	978,000	0
Gross Unrealized Losses	(23,636,000)	(21,502,000)	(23,014,000)
Fair Value	203,973,000	220,551,000	136,106,000
Mortgage-backed securities, subprime
Available-for-sale securities
Fair Value	$ 0	$ 0	$ 0

Investment Securities - Narrati

Investment Securities - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) security	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) security	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities without readily determinable fair value	$ 62,700		$ 62,700
Upward adjustments of equity securities without readily determinable fair values	0	$ 0	0	$ 0
Downward adjustments of equity securities without readily determinable fair values	0	0	0	0
Impairment of equity securities without readily determinable fair values	3,729	0	3,731	0
Pledged securities	$ 7,600,000	$ 6,400,000	$ 7,600,000	$ 6,400,000	$ 6,900,000
Number of securities by a single non-government sponsored issuer exceeding 10% of shareholders' equity | security	0		0

Investment Securities - Sched_2

Investment Securities - Schedule of Available-for-sale Investment Securities Portfolios (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	$ 1,390,314,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(20,545,000)
Continuous unrealized losses existing for greater than 12 months, fair value	2,808,442,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(557,581,000)
Total, fair value	4,198,756,000
Total, unrealized losses	(578,126,000)
Available-for-sale securities, at fair value	4,329,957,000	$ 3,502,915,000	$ 3,492,481,000
U.S. Treasury
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	90,735,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(14,000)
Continuous unrealized losses existing for greater than 12 months, fair value	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0
Total, fair value	90,735,000
Total, unrealized losses	(14,000)
Available-for-sale securities, at fair value	102,712,000	6,968,000	0
U.S. government agencies
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, fair value	45,192,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(4,808,000)
Total, fair value	45,192,000
Total, unrealized losses	(4,808,000)
Available-for-sale securities, at fair value	45,192,000	45,124,000	74,275,000
Municipal
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	42,560,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(333,000)
Continuous unrealized losses existing for greater than 12 months, fair value	78,578,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(4,796,000)
Total, fair value	121,138,000
Total, unrealized losses	(5,129,000)
Available-for-sale securities, at fair value	146,608,000	140,958,000	167,411,000
Financial issuers
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, fair value	76,985,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(7,011,000)
Total, fair value	76,985,000
Total, unrealized losses	(7,011,000)
Available-for-sale securities, at fair value	76,985,000	75,540,000	71,075,000
Other
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, fair value	990,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(10,000)
Total, fair value	990,000
Total, unrealized losses	(10,000)
Available-for-sale securities, at fair value	990,000	991,000	985,000
Residential mortgage-backed securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	1,226,130,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(19,491,000)
Continuous unrealized losses existing for greater than 12 months, fair value	2,537,424,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(522,251,000)
Total, fair value	3,763,554,000
Total, unrealized losses	(541,742,000)
Available-for-sale securities, at fair value	3,778,834,000	3,059,620,000	3,102,284,000
Commercial (multi-family) mortgage-backed securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	14,505,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(626,000)
Continuous unrealized losses existing for greater than 12 months, fair value	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0
Total, fair value	14,505,000
Total, unrealized losses	(626,000)
Available-for-sale securities, at fair value	17,478,000	12,980,000
Collateralized mortgage obligations
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	16,384,000
Continuous unrealized losses existing for less than 12 months, unrealized losses	(81,000)
Continuous unrealized losses existing for greater than 12 months, fair value	69,273,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(18,705,000)
Total, fair value	85,657,000
Total, unrealized losses	(18,786,000)
Available-for-sale securities, at fair value	161,158,000	160,734,000	76,451,000
Mortgage-backed securities, subprime
Available-for-sale securities
Available-for-sale securities, at fair value	$ 0	$ 0	$ 0

Investment Securities - Sched_3

Investment Securities - Schedule of Gross Gains and Gross Losses Realized and Impairment on Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Realized gains on investment securities	$ 1,325	$ 6	$ 2,360	$ 611
Realized losses on investment securities	(21)	(6)	(129)	(51)
Net realized gains on investment securities	1,304	0	2,231	560
Unrealized gains on equity securities with readily determinable fair value	74	684	1,108	2,974
Unrealized losses on equity securities with readily determinable fair value	(1,931)	(684)	(2,564)	(2,136)
Net unrealized (losses) gains on equity securities with readily determinable fair value	(1,857)	0	(1,456)	838
Impairment of equity securities without readily determinable fair values	(3,729)	0	(3,731)	0
(Losses) gains on investment securities, net	$ (4,282)	$ 0	$ (2,956)	$ 1,398

Investment Securities - Sched_4

Investment Securities - Schedule of Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Available-for-sale securities
Due in one year or less, amortized cost	$ 145,856	$ 53,162	$ 93,724
Due in one to five years, amortized cost	139,409	132,348	138,704
Due in five to ten years, amortized cost	84,756	82,040	41,655
Due after ten years, amortized cost	19,043	18,705	64,452
Amortized Cost	4,906,690	3,979,814	4,018,851
Due in one year or less, fair value	145,599	52,945	93,137
Due in one to five years, fair value	131,506	123,985	126,776
Due in five to ten years, fair value	79,216	76,869	36,315
Due after ten years, fair value	16,166	15,782	57,518
Fair Value	4,329,957	3,502,915	3,492,481
Held-to-maturity securities
Held-to-maturity securities, due in one year or less, amortized cost	8,356	5,169	2,479
Held-to-maturity securities, due in one to five years, amortized cost	114,457	109,602	102,182
Held-to-maturity securities, due in five to ten years, amortized cost	85,507	99,700	106,708
Held-to-maturity securities, due after ten years, amortized cost	351,737	352,474	362,252
Amortized Cost	3,756,415	3,857,263	3,564,879
Less: Allowance for credit losses	(491)	(347)	(406)
Held-to-maturity securities, net of allowance for credit losses	3,755,924	3,856,916	3,564,473
Held-to-maturity securities, due in one year or less, fair value	8,213	5,142	2,475
Held-to-maturity securities, due in one to five years, fair value	109,845	105,835	96,806
Held-to-maturity securities, due in five to ten years, fair value	82,499	98,718	105,054
Held-to-maturity securities, due after ten years, fair value	278,727	283,506	289,426
Fair Value	3,060,467	3,215,468	2,887,891
Mortgage-backed
Available-for-sale securities
Mortgage-backed, without single maturity date, amortized cost	4,517,626	3,693,559	3,680,316
Mortgage-backed, without single maturity date, fair value	3,957,470	3,233,334	3,178,735
Held-to-maturity securities
Mortgage-backed, amortized cost	3,196,358	3,290,318	2,991,258
Mortgage-backed, fair value	$ 2,581,183	$ 2,722,267	$ 2,394,130

Loans - Schedule of Loan Portfo

Loans - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Loans [Line Items]
Total loans, net of unearned income	$ 44,675,531	$ 42,131,831	$ 41,023,408
Total loans, net of unearned income, percentage	100%	100%	100%
Commercial
Loans [Line Items]
Total loans, net of unearned income	$ 14,154,462	$ 12,832,053	$ 12,600,471
Total loans, net of unearned income, percentage	31%	30%	31%
Commercial real estate
Loans [Line Items]
Total loans, net of unearned income	$ 11,947,197	$ 11,344,164	$ 10,608,811
Total loans, net of unearned income, percentage	27%	27%	26%
Home equity
Loans [Line Items]
Total loans, net of unearned income	$ 356,313	$ 343,976	$ 336,974
Total loans, net of unearned income, percentage	1%	1%	1%
Residential real estate
Loans [Line Items]
Total loans, net of unearned income	$ 3,067,335	$ 2,769,666	$ 2,643,240
Total loans, net of unearned income, percentage	7%	7%	6%
Premium finance receivables | Premium finance receivables—property & casualty
Loans [Line Items]
Total loans, net of unearned income	$ 7,100,753	$ 6,903,529	$ 6,762,698
Total loans, net of unearned income, percentage	16%	16%	16%
Premium finance receivables | Premium finance receivables—life insurance
Loans [Line Items]
Total loans, net of unearned income	$ 7,962,115	$ 7,877,943	$ 8,039,273
Total loans, net of unearned income, percentage	18%	19%	20%
Consumer and other
Loans [Line Items]
Total loans, net of unearned income	$ 87,356	$ 60,500	$ 31,941
Total loans, net of unearned income, percentage	0%	0%	0%

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Loans [Line Items]
Net deferred loan fees and costs and fair value accounting adjustments	$ 89.6	$ 84.2	$ 72.8
Premium finance receivables
Loans [Line Items]
Unearned income portion of premium finance receivables	$ 248.3	$ 285.4	$ 281.7

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest related to financial assets held at amortized cost	$ 297,200	$ 267,300	$ 297,200	$ 267,300	$ 304,500
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	Accrued interest receivable and other
Nonaccrual loans with no related allowance for credit losses	$ 46,600		$ 46,600
Provision for credit losses	39,899	$ 28,571	61,590	$ 51,641
Loan net charge-offs	30,000		51,700
Provision for credit losses	162		144
Foreclosed residential real estate properties	161		161
Commitments to lend	5,100	43,500	5,100	43,500
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses	16	(798)	136	(645)
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses	(4,913)	812	(4,309)	1,349
Premium finance receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses	7,258	813	12,961	5,420
Financing Receivable | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded investment, foreclosure proceedings in process	$ 43,800	$ 50,400	$ 43,800	$ 50,400

Allowance for Credit Losses - S

Allowance for Credit Losses - Schedule of Aging of the Company's Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 151,399	$ 118,743	$ 93,666
Loans, net of unearned income	44,675,531	42,131,831	41,023,408
Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	117
Loans, net of unearned income	134,178	150,583	187,848
Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual	51,087	38,940	40,460
Loans, net of unearned income	14,154,462	12,832,053	12,600,471
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	11,947,197	11,344,164	10,608,811
Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Nonaccrual	2,528	2,205	12,536
Loans, net of unearned income	2,260,551	2,084,041	1,760,436
Commercial real estate | Non-construction
Financing Receivable, Past Due [Line Items]
Nonaccrual	45,761	33,254	5,947
Loans, net of unearned income	9,686,646	9,260,123	8,848,375
Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,100	1,341	1,361
Loans, net of unearned income	356,313	343,976	336,974
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	3,067,335	2,769,666	2,643,240
Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	18,198	15,391	13,652
Loans, net of unearned income	2,933,157	2,619,083	2,455,392
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	32,722	27,590	19,583
Loans, net of unearned income	7,100,753	6,903,529	6,762,698
Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	6
Loans, net of unearned income	7,962,115	7,877,943	8,039,273
Consumer and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	3	22	4
Loans, net of unearned income	87,356	60,500	31,941
Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	151,399	118,743	93,549
Loans, net of unearned income	44,541,353	41,981,248	40,835,560
90+ days and still accruing
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	68,640	77,975	72,891
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	45,788	57,688	57,728
90+ days and still accruing | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	304	98	573
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 | Non-construction
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	110
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	0	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	22,427	20,135	12,785
90+ days and still accruing | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	0	0	1,667
90+ days and still accruing | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	121	54	28
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	22,852	20,287	15,163
60-89 days past due
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	59,416	70,107	58,789
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	250	918
60-89 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	16,485	19,488	22,808
60-89 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,699	251	0
60-89 days past due | Commercial real estate | Non-construction
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	4,856	8,264	1,054
60-89 days past due | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	275	62	316
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	1,977	2,325	7,243
60-89 days past due | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	29,925	23,236	22,670
60-89 days past due | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	4,118	16,206	3,729
60-89 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	81	25	51
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	59,416	69,857	57,871
30-59 days past due
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	139,768	227,976	187,675
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	0	328	0
30-59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	36,358	85,743	48,970
30-59 days past due | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	6,539	1,343	766
30-59 days past due | Commercial real estate | Non-construction
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	31,526	19,291	13,452
30-59 days past due | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	1,229	2,263	601
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	130	22,942	872
30-59 days past due | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	45,927	50,437	32,751
30-59 days past due | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	17,693	45,464	90,117
30-59 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	366	165	146
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	139,768	227,648	187,675
Current
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	44,256,308	41,637,030	40,610,387
Current | Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	88,390	92,317	129,085
Current | Commercial
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	14,050,228	12,687,784	12,487,660
Current | Commercial real estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	2,249,785	2,080,242	1,747,134
Current | Commercial real estate | Non-construction
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	9,604,503	9,199,314	8,827,922
Current | Home equity
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	353,709	340,310	334,586
Current | Residential real estate | Residential real estate, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	2,912,852	2,578,425	2,433,625
Current | Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	6,969,752	6,782,131	6,674,909
Current | Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	7,940,304	7,816,273	7,943,754
Current | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	86,785	60,234	31,712
Current | Total loans, net of unearned income, excluding early buy-out loans
Financing Receivable, Past Due [Line Items]
Loans, net of unearned income	$ 44,167,918	$ 41,544,713	$ 40,481,302

Allowance for Credit Losses -_2

Allowance for Credit Losses - Schedule of Loan Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 9,914,841		$ 9,914,841
2023	13,142,424		13,142,424
2022	5,595,328		5,595,328
2021	4,037,517		4,037,517
2020	1,857,010		1,857,010
Prior	4,848,930		4,848,930
Revolving	5,265,665		5,265,665
Revolving to term	13,816		13,816
Total Loans	44,675,531	$ 41,023,408	44,675,531	$ 41,023,408	$ 42,131,831
Gross write offs
2024			244
2023			29,608
2022			3,464
2021			1,220
2020			2,088
Prior			21,973
Revolving			0
Revolving to term			0
Total loans	34,756	18,516	58,597	25,867
Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,763,733		1,763,733
2023	2,572,616		2,572,616
2022	1,965,385		1,965,385
2021	1,456,345		1,456,345
2020	556,875		556,875
Prior	1,167,125		1,167,125
Revolving	4,662,020		4,662,020
Revolving to term	10,363		10,363
Total Loans	14,154,462		14,154,462
Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2024	78,100		78,100
2023	476,789		476,789
2022	988,979		988,979
2021	389,283		389,283
2020	83,249		83,249
Prior	221,801		221,801
Revolving	22,350		22,350
Revolving to term	0		0
Total Loans	2,260,551		2,260,551
Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	714,207		714,207
2023	1,528,020		1,528,020
2022	1,809,544		1,809,544
2021	1,416,564		1,416,564
2020	1,001,722		1,001,722
Prior	3,017,337		3,017,337
Revolving	198,987		198,987
Revolving to term	265		265
Total Loans	9,686,646		9,686,646
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	837		837
2021	196		196
2020	222		222
Prior	18,294		18,294
Revolving	333,576		333,576
Revolving to term	3,188		3,188
Total Loans	356,313	336,974	356,313	336,974	343,976
Gross write offs
Total loans	0	0	74	0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	380,894		380,894
2023	488,777		488,777
2022	825,606		825,606
2021	766,143		766,143
2020	214,473		214,473
Prior	391,442		391,442
Revolving	0		0
Revolving to term	0		0
Total Loans	3,067,335	2,643,240	3,067,335	2,643,240	2,769,666
Gross write offs
Total loans	23	0	61	0
Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,838,783		5,838,783
2023	1,252,957		1,252,957
2022	278		278
2021	8,312		8,312
2020	423		423
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	7,100,753		7,100,753
Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,137,551		1,137,551
2023	6,820,635		6,820,635
2022	3,929		3,929
2021	0		0
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	7,962,115		7,962,115
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,573		1,573
2023	2,630		2,630
2022	770		770
2021	674		674
2020	46		46
Prior	32,931		32,931
Revolving	48,732		48,732
Revolving to term	0		0
Total Loans	87,356	31,941	87,356	31,941	$ 60,500
Gross write offs
Total loans	137	$ 110	244	$ 263
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,805,921		9,805,921
2023	12,961,554		12,961,554
2022	5,392,035		5,392,035
2021	3,824,685		3,824,685
2020	1,775,791		1,775,791
Prior	4,442,572		4,442,572
Revolving	5,001,524		5,001,524
Revolving to term	11,968		11,968
Total Loans	43,216,050		43,216,050
Pass | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,759,369		1,759,369
2023	2,462,832		2,462,832
2022	1,847,769		1,847,769
2021	1,330,074		1,330,074
2020	529,579		529,579
Prior	1,099,112		1,099,112
Revolving	4,405,035		4,405,035
Revolving to term	8,966		8,966
Total Loans	13,442,736		13,442,736
Pass | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2024	78,100		78,100
2023	475,118		475,118
2022	973,989		973,989
2021	371,090		371,090
2020	79,439		79,439
Prior	159,686		159,686
Revolving	22,350		22,350
Revolving to term	0		0
Total Loans	2,159,772		2,159,772
Pass | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	710,843		710,843
2023	1,515,024		1,515,024
2022	1,757,491		1,757,491
2021	1,360,084		1,360,084
2020	961,509		961,509
Prior	2,884,404		2,884,404
Revolving	198,713		198,713
Revolving to term	265		265
Total Loans	9,388,333		9,388,333
Pass | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	0		0
2021	0		0
2020	0		0
Prior	9,272		9,272
Revolving	326,705		326,705
Revolving to term	2,737		2,737
Total Loans	338,714		338,714
Pass | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	380,670		380,670
2023	480,911		480,911
2022	808,108		808,108
2021	754,489		754,489
2020	204,797		204,797
Prior	257,334		257,334
Revolving	0		0
Revolving to term	0		0
Total Loans	2,886,309		2,886,309
Pass | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5,737,826		5,737,826
2023	1,204,432		1,204,432
2022	0		0
2021	8,281		8,281
2020	421		421
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	6,950,960		6,950,960
Pass | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,137,551		1,137,551
2023	6,820,635		6,820,635
2022	3,929		3,929
2021	0		0
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	7,962,115		7,962,115
Pass | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,562		1,562
2023	2,602		2,602
2022	749		749
2021	667		667
2020	46		46
Prior	32,764		32,764
Revolving	48,721		48,721
Revolving to term	0		0
Total Loans	87,111		87,111
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	97,305		97,305
2023	94,356		94,356
2022	127,893		127,893
2021	130,213		130,213
2020	24,987		24,987
Prior	121,946		121,946
Revolving	136,488		136,488
Revolving to term	1,587		1,587
Total Loans	734,775		734,775
Special mention | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,704		1,704
2023	62,567		62,567
2022	69,016		69,016
2021	64,001		64,001
2020	6,033		6,033
Prior	51,135		51,135
Revolving	129,899		129,899
Revolving to term	1,300		1,300
Total Loans	385,655		385,655
Special mention | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	1,176		1,176
2022	14,990		14,990
2021	17,091		17,091
2020	0		0
Prior	14,969		14,969
Revolving	0		0
Revolving to term	0		0
Total Loans	48,226		48,226
Special mention | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,364		3,364
2023	8,422		8,422
2022	37,904		37,904
2021	46,765		46,765
2020	17,230		17,230
Prior	46,738		46,738
Revolving	274		274
Revolving to term	0		0
Total Loans	160,697		160,697
Special mention | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	222		222
2021	59		59
2020	120		120
Prior	2,417		2,417
Revolving	6,313		6,313
Revolving to term	287		287
Total Loans	9,418		9,418
Special mention | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	2,985		2,985
2022	5,655		5,655
2021	2,284		2,284
2020	1,604		1,604
Prior	6,547		6,547
Revolving	0		0
Revolving to term	0		0
Total Loans	19,075		19,075
Special mention | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2024	92,231		92,231
2023	19,192		19,192
2022	95		95
2021	8		8
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	111,526		111,526
Special mention | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	0		0
2021	0		0
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	0		0
Special mention | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	6		6
2023	14		14
2022	11		11
2021	5		5
2020	0		0
Prior	140		140
Revolving	2		2
Revolving to term	0		0
Total Loans	178		178
Substandard accrual
Financing Receivable, Credit Quality Indicator [Line Items]
2024	4,377		4,377
2023	49,131		49,131
2022	60,045		60,045
2021	51,885		51,885
2020	46,031		46,031
Prior	107,891		107,891
Revolving	119,677		119,677
Revolving to term	92		92
Total Loans	439,129		439,129
Substandard accrual | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,660		2,660
2023	41,267		41,267
2022	42,882		42,882
2021	40,319		40,319
2020	20,026		20,026
Prior	8,703		8,703
Revolving	119,110		119,110
Revolving to term	17		17
Total Loans	274,984		274,984
Substandard accrual | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	0		0
2021	1,102		1,102
2020	1,777		1,777
Prior	47,146		47,146
Revolving	0		0
Revolving to term	0		0
Total Loans	50,025		50,025
Substandard accrual | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	3,202		3,202
2022	13,696		13,696
2021	9,545		9,545
2020	22,983		22,983
Prior	42,429		42,429
Revolving	0		0
Revolving to term	0		0
Total Loans	91,855		91,855
Substandard accrual | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	104		104
2021	0		0
2020	102		102
Prior	6,242		6,242
Revolving	558		558
Revolving to term	75		75
Total Loans	7,081		7,081
Substandard accrual | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	224		224
2023	596		596
2022	3,353		3,353
2021	915		915
2020	1,143		1,143
Prior	3,344		3,344
Revolving	0		0
Revolving to term	0		0
Total Loans	9,575		9,575
Substandard accrual | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,488		1,488
2023	4,052		4,052
2022	1		1
2021	4		4
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	5,545		5,545
Substandard accrual | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	0		0
2021	0		0
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	0		0
Substandard accrual | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	5		5
2023	14		14
2022	9		9
2021	0		0
2020	0		0
Prior	27		27
Revolving	9		9
Revolving to term	0		0
Total Loans	64		64
Substandard nonaccrual/doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	7,238		7,238
2023	33,621		33,621
2022	11,974		11,974
2021	26,921		26,921
2020	4,501		4,501
Prior	58,999		58,999
Revolving	7,976		7,976
Revolving to term	169		169
Total Loans	151,399		151,399
Substandard nonaccrual/doubtful | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	5,950		5,950
2022	5,718		5,718
2021	21,951		21,951
2020	1,237		1,237
Prior	8,175		8,175
Revolving	7,976		7,976
Revolving to term	80		80
Total Loans	51,087		51,087
Substandard nonaccrual/doubtful | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	495		495
2022	0		0
2021	0		0
2020	2,033		2,033
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	2,528		2,528
Substandard nonaccrual/doubtful | Non-construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	1,372		1,372
2022	453		453
2021	170		170
2020	0		0
Prior	43,766		43,766
Revolving	0		0
Revolving to term	0		0
Total Loans	45,761		45,761
Substandard nonaccrual/doubtful | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	511		511
2021	137		137
2020	0		0
Prior	363		363
Revolving	0		0
Revolving to term	89		89
Total Loans	1,100		1,100
Substandard nonaccrual/doubtful | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	523		523
2022	5,109		5,109
2021	4,642		4,642
2020	1,229		1,229
Prior	6,695		6,695
Revolving	0		0
Revolving to term	0		0
Total Loans	18,198		18,198
Substandard nonaccrual/doubtful | Premium finance receivables - property and casualty
Financing Receivable, Credit Quality Indicator [Line Items]
2024	7,238		7,238
2023	25,281		25,281
2022	182		182
2021	19		19
2020	2		2
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	32,722		32,722
Substandard nonaccrual/doubtful | Premium finance receivables - life
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	0		0
2021	0		0
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	0		0
Substandard nonaccrual/doubtful | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		0
2022	1		1
2021	2		2
2020	0		0
Prior	0		0
Revolving	0		0
Revolving to term	0		0
Total Loans	3		3
Early buy-out loans guaranteed by U.S. government agencies
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	3,762		3,762
2022	3,381		3,381
2021	3,813		3,813
2020	5,700		5,700
Prior	117,522		117,522
Revolving	0		0
Revolving to term	0		0
Total Loans	134,178		134,178
Early buy-out loans guaranteed by U.S. government agencies | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	3,762		3,762
2022	3,381		3,381
2021	3,813		3,813
2020	5,700		5,700
Prior	117,522		117,522
Revolving	0		0
Revolving to term	0		0
Total Loans	$ 134,178		$ 134,178

Allowance for Credit Losses -_3

Allowance for Credit Losses - Schedule of Held-to-Maturity Debt Securities by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Amortized Cost	$ 3,756,415	$ 3,857,263	$ 3,564,879
Less: Allowance for credit losses	(491)	(347)	(406)
Held-to-maturity securities, net of allowance for credit losses	3,755,924	3,856,916	3,564,473
U.S. government agencies
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	156,875
2021	147,815
2020	25,000
Prior	6,768
Amortized Cost	336,458	336,468	339,604
U.S. government agencies | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	156,875
2021	147,815
2020	25,000
Prior	6,768
Amortized Cost	336,458
U.S. government agencies | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	0
U.S. government agencies | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	0
Municipal
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	4,176
2022	1,035
2021	6,862
2020	258
Prior	154,069
Amortized Cost	166,400	$ 172,933	$ 176,128
Municipal | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	4,176
2022	1,035
2021	6,862
2020	258
Prior	151,716
Amortized Cost	164,047
Municipal | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	2,353
Amortized Cost	2,353
Municipal | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	0
Mortgage-backed securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	362,988
2022	555,653
2021	2,277,717
2020	0
Prior	0
Amortized Cost	3,196,358
Mortgage-backed securities | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	362,988
2022	555,653
2021	2,277,717
2020	0
Prior	0
Amortized Cost	3,196,358
Mortgage-backed securities | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	0
Mortgage-backed securities | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	0
Corporate notes
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	14,968
2021	0
2020	6,005
Prior	36,226
Amortized Cost	57,199
Corporate notes | 1-4 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	14,968
2021	0
2020	6,005
Prior	36,226
Amortized Cost	57,199
Corporate notes | 5-7 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	0
Corporate notes | 8-10 internal grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
2024
2023
2022
2021
2020
Prior
Amortized Cost	$ 0

Allowance for Credit Losses -_4

Allowance for Credit Losses - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	$ 437,069	$ 427,175	$ 427,265	$ 387,380	$ 375,798	$ 357,448
Allowance for held-to-maturity securities losses	491		347	406
Allowance for credit losses	437,560		427,612	387,786
Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	363,719		344,235	302,499
Unfunded lending-related commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	73,350		83,030	84,881
Loans and unfunded lending-related commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses and unfunded lending-related commitments losses	$ 437,069		$ 427,265	$ 387,380

Allowance for Credit Losses -_5

Allowance for Credit Losses - Schedule of Activity in the Allowance for Credit Losses by Loan Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period	$ 427,175	$ 375,798	$ 427,265	$ 357,448
Other adjustments	(19)	41	(50)	45
Charge-offs	(34,756)	(18,516)	(58,597)	(25,867)
Recoveries	4,770	1,486	6,861	3,372
Provision for credit losses	39,899	28,571	61,590	51,641
Allowance for credit losses at period end	437,069	387,380	437,069	387,380	$ 357,448
Accounting Standards Update [Extensible Enumeration]					Accounting Standards Update 2022-02 [Member]
Individually measured	37,290	13,130	37,290	13,130
Collectively measured	399,779	374,250	399,779	374,250
Loans at period end, individually evaluated for impairment	118,286	73,804	118,286	73,804
Loans at period end, collectively evaluated for impairment	44,421,411	40,749,157	44,421,411	40,749,157
Loans held-for-investment	135,834	200,447	135,834	$ 200,447
Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Accounting Standards Update [Extensible Enumeration]				Accounting Standards Update 2016-13
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	166,518	149,501	169,604	142,769
Other adjustments	0	0	0	0
Charge-offs	(9,584)	(5,629)	(20,799)	(8,172)
Recoveries	950	505	1,429	897
Provision for credit losses	24,107	(1,235)	31,757	7,537
Allowance for credit losses at period end	181,991	143,142	181,991	143,142	142,769
Individually measured	30,927	7,205	30,927	7,205
Collectively measured	151,064	135,937	151,064	135,937
Loans at period end, individually evaluated for impairment	51,087	40,460	51,087	40,460
Loans at period end, collectively evaluated for impairment	14,103,375	12,560,011	14,103,375	12,560,011
Loans held-for-investment	0	0	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	226,052	194,780	223,853	184,352
Other adjustments	0	0	0	0
Charge-offs	(15,526)	(8,124)	(20,995)	(8,129)
Recoveries	90	25	121	125
Provision for credit losses	13,112	29,015	20,749	37,992
Allowance for credit losses at period end	223,728	215,696	223,728	215,696	184,352
Individually measured	6,330	5,819	6,330	5,819
Collectively measured	217,398	209,877	217,398	209,877
Loans at period end, individually evaluated for impairment	48,289	18,483	48,289	18,483
Loans at period end, collectively evaluated for impairment	11,898,908	10,590,328	11,898,908	10,590,328
Loans held-for-investment	0	0	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	7,191	7,728	7,116	7,573
Other adjustments	0	0	0	0
Charge-offs	0	0	(74)	0
Recoveries	35	37	64	72
Provision for credit losses	16	(798)	136	(645)
Allowance for credit losses at period end	7,242	6,967	7,242	6,967	7,573
Individually measured	0	0	0	0
Collectively measured	7,242	6,967	7,242	6,967
Loans at period end, individually evaluated for impairment	1,100	1,361	1,100	1,361
Loans at period end, collectively evaluated for impairment	355,213	335,613	355,213	335,613
Loans held-for-investment	0	0	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	13,701	11,434	13,133	11,585
Other adjustments	0	0	0	0
Charge-offs	(23)	0	(61)	0
Recoveries	8	6	10	10
Provision for credit losses	(4,913)	812	(4,309)	1,349
Allowance for credit losses at period end	8,773	12,252	8,773	12,252	11,585
Individually measured	32	106	32	106
Collectively measured	8,741	12,146	8,741	12,146
Loans at period end, individually evaluated for impairment	17,807	13,496	17,807	13,496
Loans at period end, collectively evaluated for impairment	2,913,694	2,429,297	2,913,694	2,429,297
Loans held-for-investment	135,834	200,447	135,834	200,447
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	13,330	11,955	13,069	10,671
Other adjustments	(19)	41	(50)	45
Charge-offs	(9,486)	(4,653)	(16,424)	(9,303)
Recoveries	3,663	890	5,190	2,213
Provision for credit losses	7,258	813	12,961	5,420
Allowance for credit losses at period end	14,746	9,046	14,746	9,046	10,671
Individually measured	0	0	0	0
Collectively measured	14,746	9,046	14,746	9,046
Loans at period end, individually evaluated for impairment	0	0	0	0
Loans at period end, collectively evaluated for impairment	15,062,868	14,801,971	15,062,868	14,801,971
Loans held-for-investment	0	0	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	383	400	490	498
Other adjustments	0	0	0	0
Charge-offs	(137)	(110)	(244)	(263)
Recoveries	24	23	47	55
Provision for credit losses	319	(36)	296	(12)
Allowance for credit losses at period end	589	277	589	277	498
Individually measured	1	0	1	0
Collectively measured	588	277	588	277
Loans at period end, individually evaluated for impairment	3	4	3	4
Loans at period end, collectively evaluated for impairment	87,353	31,937	87,353	31,937
Loans held-for-investment	$ 0	$ 0	$ 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 -_6

Allowance for Credit Losses - Schedule of Modification of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		13 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 2,588	$ 5,063	$ 5,065	$ 45,792	$ 10,836
Percentage of Total Class of Loan	0%	0%	0%	0.10%
Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 2,115	$ 143	$ 3,455	$ 4,007
Duration of Extension of Term (months)	7 months	43 months	11 months	36 months
Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 3	$ 0	$ 171	$ 1,319
Reduction of  Interest Rate (bps)	1.40%	2.07%	1.56%	2.23%
Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 319		$ 319
Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	97	$ 0	954	$ 35,304
Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 54	$ 4,920	$ 166	$ 5,162
Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	34 months	0 months	34 months	0 months	34 months
Payment Deferral, Year-to-Date (YTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	18 months	17 months	18 months	17 months	18 months
Commercial | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 2,161	$ 423	$ 3,219	$ 37,897	$ 4,685
Percentage of Total Class of Loan	0%	0%	0%	0.30%
Commercial | Commercial, industrial and other | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 2,010	$ 0	$ 2,956	$ 1,938
Duration of Extension of Term (months)	5 months	41 months	8 months	15 months
Commercial | Commercial, industrial and other | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 0	$ 221
Reduction of  Interest Rate (bps)	1.43%	1.44%	1.13%	1.08%
Commercial | Commercial, industrial and other | Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0		$ 0
Commercial | Commercial, industrial and other | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	97	$ 0	97	$ 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	$ 54	$ 423	$ 166	$ 473
Commercial | Commercial, industrial and other | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	34 months	0 months	34 months	0 months	34 months
Commercial | Commercial, industrial and other | Payment Deferral, Year-to-Date (YTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	34 months	16 months	34 months	16 months	34 months
Commercial real estate | Non-construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 340	$ 4,376	$ 1,469	$ 5,709	$ 2,644
Percentage of Total Class of Loan	0%	0%	0%	0.10%
Commercial real estate | Non-construction | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 21	$ 0	$ 293	$ 467
Duration of Extension of Term (months)	13 months	39 months	29 months	40 months
Commercial real estate | Non-construction | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 0	$ 827
Reduction of  Interest Rate (bps)	0%	2.12%	0%	2.32%
Commercial real estate | Non-construction | Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 319		$ 319
Commercial real estate | Non-construction | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	$ 0	857	$ 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	$ 4,376	$ 0	$ 4,376
Commercial real estate | Non-construction | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months	0 months	0 months	0 months	0 months
Commercial real estate | Non-construction | Payment Deferral, Year-to-Date (YTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	16 months	101 months	16 months	101 months	16 months
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 89	$ 203	$ 586
Percentage of Total Class of Loan	0%	0%	0%	0.10%
Home equity | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 89	$ 203
Duration of Extension of Term (months)	0 months	0 months	12 months	12 months
Home equity | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 0	$ 0
Reduction of  Interest Rate (bps)	0%	0%	0%	0%
Home equity | Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0		$ 0
Home equity | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	$ 0	0	$ 0
Home equity | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 0	$ 0
Home equity | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months		0 months		0 months
Home equity | Payment Deferral, Year-to-Date (YTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months	0 months	0 months	0 months	0 months
Home equity | Non-construction | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)		0 months		0 months
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 81	$ 264	$ 282	$ 1,972	$ 417
Percentage of Total Class of Loan	0%	0%	0%	0.10%
Residential real estate | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 81	$ 143	$ 114	$ 1,396
Duration of Extension of Term (months)	12 months	123 months	19 months	57 months
Residential real estate | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 0	$ 168	$ 271
Reduction of  Interest Rate (bps)	0%	2.62%	2.01%	2.84%
Residential real estate | Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0		$ 0
Residential real estate | Delay in Contractual Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	$ 0	0	$ 0
Residential real estate | Extended of Term and Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0	$ 121	$ 0	$ 305
Residential real estate | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months		0 months		0 months
Residential real estate | Payment Deferral, Year-to-Date (YTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months	0 months	0 months	0 months	0 months
Residential real estate | Non-construction | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)		0 months		0 months
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 6	$ 0	$ 6	$ 11	$ 18
Percentage of Total Class of Loan	0%	0%	0%	0%
Premium finance receivables | Property and casualty insurance loans | Extension of Term
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 3	$ 0	$ 3	$ 3
Duration of Extension of Term (months)	2 months	0 months	2 months	0 months
Premium finance receivables | Property and casualty insurance loans | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 3	$ 0	$ 3	$ 0
Reduction of  Interest Rate (bps)	0.86%	0%	0.86%	0.50%
Premium finance receivables | Property and casualty insurance loans | Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 0		$ 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	$ 0	0	$ 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	$ 0	$ 0	$ 0	$ 8
Premium finance receivables | Property and casualty insurance loans | Payment Deferral, Quarterly (QTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months	0 months	0 months	0 months	0 months
Premium finance receivables | Property and casualty insurance loans | Payment Deferral, Year-to-Date (YTD)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Duration of Delay in Contractual Payments (months)	0 months	0 months	0 months	0 months	0 months

Allowance for Credit Losses -_7

Allowance for Credit Losses - Schedule of Loans for Borrowers Experiencing Financial Difficulties Modified (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		13 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	$ 2,588	$ 5,063	$ 5,065	$ 45,792	$ 10,836
Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	97	0	954	35,304
Post-modification loan balances, payments in default	2,821	20,407	4,625	20,407
Commercial | Commercial, industrial and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	2,161	423	3,219	37,897	4,685
Commercial | Commercial, industrial and other | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	97	0	97	35,265
Post-modification loan balances, payments in default	1,784	18,729	1,784	18,729
Commercial real estate | Construction and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances				0	2,486
Commercial real estate | Construction and development | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances, payments in default	0	0	0	0
Commercial real estate | Non-construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	340	4,376	1,469	5,709	2,644
Commercial real estate | Non-construction | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	0	857	39
Post-modification loan balances, payments in default	639	923	2,443	923
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	0	89	203	586
Home equity | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	0	0	0
Post-modification loan balances, payments in default	0	203	0	203
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	81	264	282	1,972	417
Residential real estate | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	0	0	0
Post-modification loan balances, payments in default	384	541	384	541
Premium finance receivables | Property and casualty insurance loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	6	0	6	11	$ 18
Premium finance receivables | Property and casualty insurance loans | Payments in Default
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-modification loan balances	0	0	0	0
Post-modification loan balances, payments in default	$ 14	$ 11	$ 14	$ 11

Goodwill and Other Acquisitio_3

Goodwill and Other Acquisition-Related Intangible Assets - Schedule of Goodwill Assets by Reporting Unit (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 656,672
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	(717)
Ending balance	655,955
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	39,006
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	(717)
Ending balance	38,289
Wealth management
Goodwill [Roll Forward]
Beginning balance	71,995
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	$ 71,995

Goodwill and Other Acquisitio_4

Goodwill and Other Acquisition-Related Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Indefinite-lived Intangible Assets [Line Items]
Amortization of other acquisition-related intangible assets	$ 1,122	$ 1,499	$ 2,280	$ 2,734
Community banking | Core deposit intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years		10 years
Specialty finance
Indefinite-lived Intangible Assets [Line Items]
Goodwill decrease for foreign currency translation adjustments			$ 717
Specialty finance | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	18 years		18 years
Wealth management | Customer list and other intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years		10 years

Goodwill and Other Acquisitio_5

Goodwill and Other Acquisition-Related Intangible Assets - Schedule of Amortization of Finite-Lived Acquisition-Related Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Intangibles with finite lives
Accumulated amortization	$ (68,990)	$ (66,710)	$ (63,946)
Intangibles with indefinite lives
Gross carrying amount	89,597	89,599	89,599
Total other acquisition-related intangible assets, net	20,607	22,889	25,653
Community banking
Intangibles with indefinite lives
Total other acquisition-related intangible assets, net	13,340	14,881	16,574
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	(47,666)	(46,125)	(44,432)
Net carrying amount	7,540	9,081	10,774
Specialty finance | Customer list intangibles
Intangibles with finite lives
Gross carrying amount	1,961	1,963	1,963
Accumulated amortization	(1,861)	(1,837)	(1,813)
Net carrying amount	100	126	150
Wealth management | Customer list and other intangibles
Intangibles with finite lives
Gross carrying amount	26,630	26,630	26,630
Accumulated amortization	(19,463)	(18,748)	(17,701)
Net carrying amount	$ 7,167	$ 7,882	$ 8,929

Goodwill and Other Acquisitio_6

Goodwill and Other Acquisition-Related Intangible Assets - Schedule of Estimated Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Actual in six months ended June 30, 2024	$ 1,122	$ 1,499	$ 2,280	$ 2,734
Estimated remaining in 2024	2,021		2,021
Estimated—2025	3,482		3,482
Estimated—2026	2,772		2,772
Estimated—2027	2,156		2,156
Estimated—2028	$ 1,591		$ 1,591

Mortgage Servicing Rights ("M_3

Mortgage Servicing Rights ("MSRs") (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value at beginning of the period	$ 201,044	$ 224,470	$ 192,456	$ 230,225
Additions from loans sold with servicing retained	8,223	8,720	13,602	13,827
Servicing rights sold	0	(30,170)	0	(30,170)
Estimate of changes in fair value due to:
Payoffs, paydowns and repurchases	(5,534)	(5,043)	(9,920)	(8,952)
Changes in valuation inputs or assumptions	877	2,715	8,472	(4,238)
Fair value at end of the period	204,610	200,692	204,610	200,692
Unpaid principal balance of mortgage loans serviced for others	$ 12,211,027	$ 11,752,223	$ 12,211,027	$ 11,752,223

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Balance:
Non-interest-bearing	$ 10,031,440	$ 10,420,401	$ 10,604,915
NOW and interest-bearing demand deposits	5,053,909	5,797,649	5,814,836
Wealth management deposits	1,490,711	1,614,499	1,417,984
Money market	16,320,017	15,149,215	14,523,124
Savings	5,882,179	5,790,334	5,321,578
Time certificates of deposit	9,270,770	6,625,072	6,356,270
Total deposits	$ 48,049,026	$ 45,397,170	$ 44,038,707
Mix:
Non-interest-bearing	21%	23%	24%
NOW and interest-bearing demand deposits	11%	13%	13%
Wealth management deposits	3%	4%	3%
Money market	34%	33%	33%
Savings	12%	13%	12%
Time certificates of deposit	19%	14%	15%
Total deposits	100%	100%	100%

FHLB Advances, Other Borrowin_3

FHLB Advances, Other Borrowings and Subordinated Notes - Schedule of FHLB Advances, Other Borrowings and Subordinated Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Debt Disclosure [Abstract]
FHLB advances	$ 3,176,309	$ 2,326,071	$ 2,026,071
Other borrowings:
Notes payable	157,024	171,282	185,539
Short-term borrowings	0	13,430	17,773
Secured borrowings	391,395	401,897	401,669
Other	58,160	59,204	60,238
Total other borrowings	606,579	645,813	665,219
Subordinated notes	298,113	437,866	437,628
Total FHLB advances, other borrowings and subordinated notes	$ 4,081,001	$ 3,409,750	$ 3,128,918

FHLB Advances, Other Borrowin_4

FHLB Advances, Other Borrowings and Subordinated Notes - Narrative (Details) - USD ($)			3 Months Ended	6 Months Ended
	May 31, 2023	May 30, 2023	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2019
Debt Instrument [Line Items]
Secured borrowings			$ 391,395,000	$ 391,395,000	$ 401,669,000	$ 401,897,000
Outstanding subordinated notes			298,113,000	298,113,000	437,628,000	437,866,000
Repayments of subordinated notes				140,000,000	0
Collateral Pledged
Debt Instrument [Line Items]
Pledged financial instruments			0	0
Securities Sold under Agreements to Repurchase | Maturity Overnight
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			0	0	16,300,000	13,400,000
Secured Debt
Debt Instrument [Line Items]
Secured borrowings			11,100,000	11,100,000	9,300,000	9,400,000
Fixed Rate Promissory Note
Debt Instrument [Line Items]
Principal amount of debt			$ 66,400,000	$ 66,400,000
Stated interest rate			1.70%	1.70%
Term Loan Facility
Debt Instrument [Line Items]
Amount outstanding			$ 157,000,000	$ 157,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding			0	0
Receivables Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Borrowing capacity	$ 520,000,000	$ 420,000,000
Borrowing fee rate	0.825%	0.775%
Secured borrowings			380,300,000	$ 380,300,000	$ 392,400,000	$ 392,500,000
Basis spread on variable rate				0.825%
4.85% subordinated notes maturing in June 2029 | Subordinated Debt
Debt Instrument [Line Items]
Stated interest rate							4.85%
5.00% subordinated notes maturing in June 2024
Debt Instrument [Line Items]
Repayments of subordinated notes			$ 140,000,000
5.00% subordinated notes maturing in June 2024 | Subordinated Debt
Debt Instrument [Line Items]
Stated interest rate			5%	5%

Junior Subordinated Debenture_2

Junior Subordinated Debentures - Schedule of Junior Subordinated Debentures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
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	7.79%
Junior Subordinated Debt | Wintrust Capital Trust III
Subordinated Borrowing [Line Items]
Common Securities	$ 774
Trust  Preferred Securities	25,000
Junior subordinated debentures	$ 25,774
Rate structure, stated	0.26161%
Rate structure, variable	3.25%
Weighted average contractual rate	8.84%
Junior Subordinated Debt | Wintrust Statutory Trust IV
Subordinated Borrowing [Line Items]
Common Securities	$ 619
Trust  Preferred Securities	20,000
Junior subordinated debentures	$ 20,619
Rate structure, stated	0.26161%
Rate structure, variable	2.80%
Weighted average contractual rate	8.39%
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
Rate structure, stated	0.26161%
Rate structure, variable	2.60%
Weighted average contractual rate	8.19%
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
Rate structure, stated	0.26161%
Rate structure, variable	1.95%
Weighted average contractual rate	7.55%
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
Rate structure, stated	0.26161%
Rate structure, variable	1.45%
Weighted average contractual rate	7.04%
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
Rate structure, stated	0.26161%
Rate structure, variable	1.63%
Weighted average contractual rate	7.23%
Junior Subordinated Debt | Northview Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 186
Trust  Preferred Securities	6,000
Junior subordinated debentures	$ 6,186
Rate structure, stated	0.26161%
Rate structure, variable	3%
Weighted average contractual rate	8.59%
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
Rate structure, stated	0.26161%
Rate structure, variable	3%
Weighted average contractual rate	8.59%
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
Rate structure, stated	0.26161%
Rate structure, variable	3%
Weighted average contractual rate	8.59%
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
Rate structure, stated	0.26161%
Rate structure, variable	1.75%
Weighted average contractual rate	7.35%
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
Rate structure, stated	0.26161%
Rate structure, variable	1.62%
Weighted average contractual rate	7.22%

Junior Subordinated Debenture_3

Junior Subordinated Debentures - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
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	7.79%

Segment Information - Narrative

Segment Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2024 segment subsidiary
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 - Schedule

Segment Information - Schedule of Operating Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Net interest income:
Net interest income	$ 470,610	$ 447,537	$ 934,804	$ 905,532
Net interest income, change in contribution	$ 23,073		$ 29,272
Net interest income, percent change in contribution	5%		3%
Provision for credit losses:
Provision for credit losses	$ 40,061	28,514	$ 61,734	51,559
Provision for credit losses, change in contribution	$ 11,547		$ 10,175
Provision for credit losses, percent change in contribution	40%		20%
Non-interest income:
Non-interest income	$ 121,147	113,030	$ 261,727	220,799
Non-interest income, change in contribution	$ 8,117		$ 40,928
Non-interest income, percent change in contribution	7%		19%
Net revenue:
Net revenue	$ 591,757	560,567	$ 1,196,531	1,126,331
Net revenue, change in contribution	$ 31,190		$ 70,200
Net revenue, percent change in contribution	6%		6%
Segment profit:
Segment profit	$ 152,388	154,750	$ 339,682	334,948
Segment profit, change in contribution	$ (2,362)		$ 4,734
Segment profit, percent change in contribution	(2.00%)		10%
Segment assets:
Segment assets	$ 59,781,516	54,286,176	$ 59,781,516	54,286,176	$ 56,259,934
Segment assets, change in contribution	$ 5,495,340
Segment assets, percent change in contribution	10%
Community banking
Segment profit:
Segment profit	$ 91,235	102,517	211,282	236,749
Segment profit, change in contribution	$ (11,282)		$ (25,467)
Segment profit, percent change in contribution	(11.00%)		12%
Segment assets:
Segment assets	$ 47,611,508	42,452,673	$ 47,611,508	42,452,673
Segment assets, change in contribution	$ 5,158,835
Segment assets, percent change in contribution	12%
Specialty finance
Segment profit:
Segment profit	$ 53,091	46,402	95,614	83,139
Segment profit, change in contribution	$ 6,689		$ 12,475
Segment profit, percent change in contribution	14%		4%
Segment assets:
Segment assets	$ 11,014,840	10,549,819	$ 11,014,840	10,549,819
Segment assets, change in contribution	$ 465,021
Segment assets, percent change in contribution	4%
Wealth management
Segment profit:
Segment profit	$ 8,062	5,831	32,786	15,060
Segment profit, change in contribution	$ 2,231		$ 17,726
Segment profit, percent change in contribution	38%		(10.00%)
Segment assets:
Segment assets	$ 1,155,168	1,283,684	$ 1,155,168	1,283,684
Segment assets, change in contribution	$ (128,516)
Segment assets, percent change in contribution	(10.00%)
Operating Segments
Net interest income:
Net interest income	$ 461,951	438,629	915,676	887,783
Net interest income, change in contribution	$ 23,322		$ 27,893
Net interest income, percent change in contribution	5%		3%
Provision for credit losses:
Provision for credit losses	$ 40,061	28,514	$ 61,734	51,559
Provision for credit losses, change in contribution	$ 11,547		$ 10,175
Provision for credit losses, percent change in contribution	40%		20%
Non-interest income:
Non-interest income	$ 139,541	133,258	$ 299,979	258,078
Non-interest income, change in contribution	$ 6,283		$ 41,901
Non-interest income, percent change in contribution	5%		16%
Net revenue:
Net revenue	$ 601,492	571,887	$ 1,215,655	1,145,861
Net revenue, change in contribution	$ 29,605		$ 69,794
Net revenue, percent change in contribution	5%		6%
Operating Segments | Community banking
Net interest income:
Net interest income	$ 358,832	346,232	$ 722,517	716,080
Net interest income, change in contribution	$ 12,600		$ 6,437
Net interest income, percent change in contribution	4%		1%
Provision for credit losses:
Provision for credit losses	$ 36,325	26,713	$ 56,717	47,812
Provision for credit losses, change in contribution	$ 9,612		$ 8,905
Provision for credit losses, percent change in contribution	36%		19%
Non-interest income:
Non-interest income	$ 71,619	68,130	$ 146,255	136,863
Non-interest income, change in contribution	$ 3,489		$ 9,392
Non-interest income, percent change in contribution	5%		7%
Net revenue:
Net revenue	$ 430,451	414,362	$ 868,772	852,943
Net revenue, change in contribution	$ 16,089		$ 15,829
Net revenue, percent change in contribution	4%		2%
Operating Segments | Specialty finance
Net interest income:
Net interest income	$ 95,191	84,993	$ 177,473	155,344
Net interest income, change in contribution	$ 10,198		$ 22,129
Net interest income, percent change in contribution	12%		14%
Provision for credit losses:
Provision for credit losses	$ 3,736	1,801	$ 5,017	3,747
Provision for credit losses, change in contribution	$ 1,935		$ 1,270
Provision for credit losses, percent change in contribution	107%		34%
Non-interest income:
Non-interest income	$ 32,317	31,737	$ 59,634	57,527
Non-interest income, change in contribution	$ 580		$ 2,107
Non-interest income, percent change in contribution	2%		4%
Net revenue:
Net revenue	$ 127,508	116,730	$ 237,107	212,871
Net revenue, change in contribution	$ 10,778		$ 24,236
Net revenue, percent change in contribution	9%		11%
Operating Segments | Wealth management
Net interest income:
Net interest income	$ 7,928	7,404	$ 15,686	16,359
Net interest income, change in contribution	$ 524		$ (673)
Net interest income, percent change in contribution	7%		(4.00%)
Provision for credit losses:
Provision for credit losses	$ 0	0	$ 0	0
Provision for credit losses, change in contribution	$ 0		$ 0
Provision for credit losses, percent change in contribution	0%		0%
Non-interest income:
Non-interest income	$ 35,605	33,391	$ 94,090	63,688
Non-interest income, change in contribution	$ 2,214		$ 30,402
Non-interest income, percent change in contribution	7%		48%
Net revenue:
Net revenue	$ 43,533	40,795	$ 109,776	80,047
Net revenue, change in contribution	$ 2,738		$ 29,729
Net revenue, percent change in contribution	7%		37%
Intersegment Eliminations
Net interest income:
Net interest income	$ 8,659	8,908	$ 19,128	17,749
Net interest income, change in contribution	$ (249)		$ 1,379
Net interest income, percent change in contribution	(3.00%)		8%
Provision for credit losses:
Provision for credit losses	$ 0	0	$ 0	0
Provision for credit losses, change in contribution	$ 0		$ 0
Provision for credit losses, percent change in contribution	0%		0%
Non-interest income:
Non-interest income	$ (18,394)	(20,228)	$ (38,252)	(37,279)
Non-interest income, change in contribution	$ 1,834		$ (973)
Non-interest income, percent change in contribution	(9.00%)		3%
Net revenue:
Net revenue	$ (9,735)	$ (11,320)	$ (19,124)	$ (19,530)
Net revenue, change in contribution	$ 1,585		$ 406
Net revenue, percent change in contribution	(14.00%)		(2.00%)

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Derivative [Line Items]
Derivative Assets	$ 243,860	$ 275,726	$ 294,748
Derivative Liabilities	317,659	267,255	391,172
Interest rate derivatives
Derivative [Line Items]
Derivative Assets	235,485	263,955	279,614
Derivative Liabilities	313,982	255,126	382,413
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	20,210	52,465	18,409
Derivative Liabilities	96,825	44,729	121,347
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Cash Flow Hedges
Derivative [Line Items]
Derivative Assets	7,532	40,116	2,154
Derivative Liabilities	96,825	44,456	121,347
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Fair Value Hedges
Derivative [Line Items]
Derivative Assets	12,678	12,349	16,255
Derivative Liabilities	0	273	0
Not designated as hedging instrument
Derivative [Line Items]
Derivative Assets	223,650	223,261	276,339
Derivative Liabilities	220,834	222,526	269,825
Not designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	215,275	211,490	261,205
Derivative Liabilities	217,157	210,397	261,066
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	4,795	4,511	3,487
Derivative Liabilities	67	0	172
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	102	0	2,769
Derivative Liabilities	597	5,212	38
Not designated as hedging instrument | Commodity forward contracts
Derivative [Line Items]
Derivative Assets	702	888	434
Derivative Liabilities	304	609	214
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	2,776	6,372	8,444
Derivative Liabilities	$ 2,709	$ 6,308	$ 8,335

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Cash Flow Hedging Instruments (Details) - Designated as hedging instrument - Cash Flow Hedging $ in Thousands	Jun. 30, 2024 USD ($)
Derivative [Line Items]
Notional Amount	$ 6,700,000
Fair Value Asset (Liability)	(89,294)
Buy 2.250% floor, sell 3.743% cap; matures September 2025
Derivative [Line Items]
Notional Amount	1,250,000
Fair Value Asset (Liability)	$ (16,589)
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)	$ (4,740)
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)	$ (37,289)
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)	$ (3,114)
Derivative fixed interest rate	3.748%
Fixed 3.759%; matures December 2025
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (3,075)
Derivative fixed interest rate	3.759%
Fixed 3.680%; matures February 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (3,735)
Derivative fixed interest rate	3.68%
Fixed 4.176%; matures March 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (1,773)
Derivative fixed interest rate	4.176%
Fixed 3.915%; matures March 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (2,826)
Derivative fixed interest rate	3.915%
Fixed 4.450%; matures July 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (206)
Derivative fixed interest rate	4.45%
Fixed 3.515%, matures December 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (4,597)
Derivative fixed interest rate	3.515%
Fixed 3.512%; matures December 2026
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (4,614)
Derivative fixed interest rate	3.512%
Fixed 3.453%; matures February 2027
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (5,369)
Derivative fixed interest rate	3.453%
Fixed 4.150%; matures July 2027
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (591)
Derivative fixed interest rate	4.15%
Fixed 3.748%; matures March 2028
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (3,203)
Derivative fixed interest rate	3.748%
Fixed 3.526%; matures March 2028
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ (5,104)
Derivative fixed interest rate	3.526%
Fixed 3.993%; matures October 2029
Derivative [Line Items]
Notional Amount	$ 100,000
Fair Value Asset (Liability)	$ 444
Derivative fixed interest rate	3.993%
Fixed 3.993%; matures October 2029
Derivative [Line Items]
Notional Amount	$ 250,000
Fair Value Asset (Liability)	$ 1,111
Derivative fixed interest rate	3.993%
Fixed 4.245%; matures November 2029
Derivative [Line Items]
Notional Amount	$ 175,000
Fair Value Asset (Liability)	$ 2,988
Derivative fixed interest rate	4.245%
Fixed 4.245%; matures November 2029
Derivative [Line Items]
Notional Amount	$ 175,000
Fair Value Asset (Liability)	$ 2,988
Derivative fixed interest rate	4.245%

Derivative Financial Instrume_5

Derivative Financial Instruments - Narrative (Details)	3 Months Ended		6 Months Ended
	Dec. 31, 2022 USD ($) derivativeInstrument	Mar. 31, 2022 USD ($)	Jun. 30, 2024 USD ($) derivativeInstrument	Dec. 31, 2023 USD ($) derivativeInstrument	Jun. 30, 2023 derivativeInstrument	Jun. 30, 2022 USD ($) derivativeInstrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest income (expense) in the next twelve months			$ (60,600,000)
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 income (expense) in the next twelve months			13,300,000
Interest Rate Swap And Collar
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest income (expense) in the next twelve months			(73,900,000)
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 170,000,000	$ 195,000,000
Number of derivative instruments held | derivativeInstrument			6	4
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, qualified borrowers
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			12,200,000,000	$ 11,400,000,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			237,900,000	129,900,000
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			641,300,000	626,900,000
Not designated as hedging instrument | Commodity forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			12,600,000	8,400,000
Not designated as hedging instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount			$ 138,800,000	$ 144,300,000
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			$ 6,700,000,000
Interest rate derivatives designated as Cash Flow Hedges | Designated as hedging instrument | Interest Rate Swap Terminated
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount		$ 1,000,000,000				$ 500,000,000
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			$ 213,100,000
Number of interest rate derivatives | derivativeInstrument			13

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Amounts in Accumulated Other Comprehensive Income Related to Interest Rate Swaps Designated as Cash Flow Hedges (Details) - Interest rate contract - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized gain at beginning of period	$ (38,553)	$ 44,692	$ 43,538	$ 10,026
Amount reclassified from accumulated other comprehensive income or loss to interest income or expense on deposits, loans, and other borrowings	20,524	14,267	40,342	18,014
Amount of loss recognized in other comprehensive income or loss	(31,367)	(120,698)	(133,276)	(89,779)
Unrealized (loss) gain at end of period	$ (49,396)	$ (61,739)	$ (49,396)	$ (61,739)

Derivative Financial Instrume_7

Derivative Financial Instruments - Schedule of Carrying Amount of Hedged Assets/(Liabilities (Details) - Designated as Hedging Instrument - Interest rate swaps $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)
Interest and fees on loans
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	$ (16)	$ (6)
Interest income - investment securities
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	0	0
Loans, net of unearned income
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	199,732	199,732
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(12,684)	(12,684)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	(69)	(69)
Available-for-sale debt securities
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	672	672
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(18)	(18)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	$ 0	$ 0

Derivative Financial Instrume_8

Derivative Financial Instruments - Schedule of Consolidated Statement of Income Related to Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest rate swaps and caps | Trading gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (102)	$ 12	$ 493	$ 812
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	3,721	4,791	3,706	8,431
Commodity contracts | Trading gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	130	49	398	226
Foreign exchange contracts | Trading gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	11	0	19	0
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	2,056	2,578	6,903	12,969
Derivative contract held as economic hedge on MSRs | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (772)	$ (726)	$ (3,349)	$ 220

Derivative Financial Instrume_9

Derivative Financial Instruments - Schedule of Offsetting Assets / Offsetting Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Derivative Assets
Gross Amounts Recognized	$ 243,860	$ 275,726	$ 294,748
Derivative Liabilities
Gross Amounts Recognized	317,659	267,255	391,172
Interest rate contract
Derivative Assets
Gross Amounts Recognized	235,485	263,955	279,614
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	235,485	263,955	279,614
Offsetting Derivative Positions	(114,662)	(76,514)	(125,159)
Collateral Posted	(85,762)	(144,899)	(145,735)
Net Credit Exposure	35,061	42,542	8,720
Derivative Liabilities
Gross Amounts Recognized	313,982	255,126	382,413
Less: Amounts offset in the Statements of Condition	0	0	0
Net amount presented in the Statements of Condition	313,982	255,126	382,413
Offsetting Derivative Positions	(114,662)	(76,514)	(125,159)
Collateral Posted	0	0	0
Net Credit Exposure	$ 199,320	$ 178,612	$ 257,254

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities - Narrative (Details)	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 4,329,957,000		$ 3,502,915,000	$ 3,492,481,000
Loans held-for-investment	135,834,000			200,447,000
MSRs	204,610,000	$ 201,044,000	192,456,000	200,692,000	$ 224,470,000	$ 230,225,000
Individually assessed loans - foreclosure probable and collateral-dependent	118,286,000			73,804,000
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4,329,957,000		3,502,915,000	3,492,481,000
Remaining contractual principal balance outstanding, mortgage loans held-for-sale	414,100,000		291,700,000	345,700,000
Remaining contractual principal balance outstanding, mortgage loans held-for-investment	136,100,000		156,900,000	196,600,000
Non-performing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale classified as nonaccrual	2,100,000		649,000	582,000
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing	$ 39,400,000		26,600,000	29,600,000
Weighted Average | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life of loans	5 years 10 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	$ 411,851,000		292,722,000	338,728,000
Loans held-for-investment	135,834,000		155,261,000	193,953,000
MSRs	204,610,000		192,456,000	200,692,000
Derivative assets	243,860,000		275,726,000	294,748,000
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	118,286,000
Other real estate owned	19,731,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	118,300,000
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	40,545,000		26,835,000	29,406,000
Loans held-for-investment	45,721,000		60,670,000	61,123,000
MSRs	204,610,000		192,456,000	200,692,000
Derivative assets	$ 4,795,000		4,510,000	3,487,000
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	0.1098
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	0.0683
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	0.0683
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	0.1098
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	0.01
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	0.01
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	0.36
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	0.36
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	0.0036
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	0.0110
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	0.13
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	0.17
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	0.0786
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	0.0786
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	0.0786
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	0.90
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	0.90
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	77
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	361
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	0.8117
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	0.04
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	$ 118,286,000
Other real estate owned	19,731,000
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	146,608,000		140,958,000	167,411,000
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	146,608,000		140,958,000	167,411,000
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	$ 95,792,000		$ 86,237,000	$ 114,155,000

Fair Values of Assets and Lia_4

Fair Values of Assets and Liabilities - Schedule of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 4,329,957		$ 3,502,915	$ 3,492,481
Equity securities with readily determinable fair value	112,173		139,268	116,275
Loans held-for-investment	135,834			200,447
MSRs	204,610	$ 201,044	192,456	200,692	$ 224,470	$ 230,225
U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	102,712		6,968	0
U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	45,192		45,124	74,275
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	146,608		140,958	167,411
Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	4,134		4,707	3,027
Equity securities with readily determinable fair value	112,173		139,268	116,275
Mortgage loans held-for-sale	411,851		292,722	338,728
Loans held-for-investment	135,834		155,261	193,953
MSRs	204,610		192,456	200,692
Nonqualified deferred compensation assets	16,041		15,238	14,796
Derivative assets	243,860		275,726	294,748
Total	5,458,460		4,578,293	4,654,700
Derivative liabilities	317,659		267,255	391,172
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	104,107		131,202	108,209
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	206,819		138,170	108,209
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	4,134		4,707	3,027
Equity securities with readily determinable fair value	8,066		8,066	8,066
Mortgage loans held-for-sale	371,306		265,887	309,322
Loans held-for-investment	90,113		94,591	132,830
MSRs	0		0	0
Nonqualified deferred compensation assets	16,041		15,238	14,796
Derivative assets	239,065		271,216	291,261
Total	4,860,178		4,069,415	4,137,628
Derivative liabilities	317,659		267,255	391,172
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	40,545		26,835	29,406
Loans held-for-investment	45,721		60,670	61,123
MSRs	204,610		192,456	200,692
Nonqualified deferred compensation assets	0		0	0
Derivative assets	4,795		4,510	3,487
Total	391,463		370,708	408,863
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	102,712		6,968	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	102,712		6,968	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	45,192		45,124	74,275
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	45,192		45,124	74,275
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	40,545
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	146,608		140,958	167,411
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	50,816		54,721	53,256
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	95,792		86,237	114,155
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	77,975		76,531	72,060
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	77,975		76,531	72,060
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	3,957,470		3,233,334	3,178,735
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	3,957,470		3,233,334	3,178,735
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 - Schedule of Changes In Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 88,219	$ 112,257	$ 86,237	$ 117,537
Net income	0	0	0	0
Other comprehensive income or loss	(680)	(3,161)	(2,668)	(4,823)
Purchases	9,682	6,978	18,066	11,396
Issuances			0
Sales		0	0	0
Settlements	(1,429)	(1,919)	(5,843)	(9,955)
Net transfers into Level 3	0	0	0	0
Ending balance	95,792	114,155	95,792	114,155
Mortgage loans held-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	33,726	44,250	26,835	48,655
Net income	205	402	272	868
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances			0
Sales		0	0	0
Settlements	(10,269)	(23,973)	(20,609)	(42,592)
Net transfers into Level 3	16,883	8,727	34,047	22,475
Ending balance	40,545	29,406	40,545	29,406
Loans held-for- investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	49,317	69,493	60,670	84,165
Net income	66	(619)	(251)	(255)
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances			0
Sales		0	0	0
Settlements	(7,709)	(16,593)	(23,512)	(36,915)
Net transfers into Level 3	4,047	8,842	8,814	14,128
Ending balance	45,721	61,123	45,721	61,123
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	201,044	224,470	192,456	230,225
Net income	3,566	6,392	12,154	637
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances			0
Sales		(30,170)	0	(30,170)
Settlements	0	0	0	0
Net transfers into Level 3	0	0	0	0
Ending balance	204,610	200,692	204,610	200,692
Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	6,212	5,356	4,510	1,711
Net income	(1,417)	(1,869)	285	1,776
Other comprehensive income or loss	0	0	0	0
Purchases	0	0	0	0
Issuances			0
Sales		0	0	0
Settlements	0	0	0	0
Net transfers into Level 3	0	0	0	0
Ending balance	$ 4,795	$ 3,487	$ 4,795	$ 3,487

Fair Values of Assets and Lia_6

Fair Values of Assets and Liabilities - Schedule of Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	$ 118,286	$ 118,286	$ 73,804
Fair value losses - individually assessed loans - foreclosure probable and collateral-dependent	25,113	41,839
Fair value losses - other real estate owned	0	207
Fair value losses	25,113	42,046
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	118,300	118,300
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	118,286	118,286
Other real estate owned	19,731	19,731
Total	138,017	138,017
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	0
Other real estate owned	0	0
Total	0	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	0
Other real estate owned	0	0
Total	0	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	118,286	118,286
Other real estate owned	19,731	19,731
Total	$ 138,017	$ 138,017

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 (Details)	Jun. 30, 2024 USD ($) $ / shares year	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	$ 4,329,957,000		$ 3,502,915,000	$ 3,492,481,000
Loans held-for-investment	135,834,000			200,447,000
MSRs	204,610,000	$ 201,044,000	192,456,000	200,692,000	$ 224,470,000	$ 230,225,000
Individually assessed loans - foreclosure probable and collateral-dependent	118,286,000			73,804,000
Municipal securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	146,608,000		140,958,000	167,411,000
U.S. government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	45,192,000		45,124,000	74,275,000
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Individually assessed loans - foreclosure probable and collateral-dependent	118,300,000
Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale	411,851,000		292,722,000	338,728,000
Loans held-for-investment	135,834,000		155,261,000	193,953,000
MSRs	204,610,000		192,456,000	200,692,000
Derivative assets	243,860,000		275,726,000	294,748,000
Measured at fair value on a recurring basis: | Municipal securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	146,608,000		140,958,000	167,411,000
Measured at fair value on a recurring basis: | U.S. government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	45,192,000		45,124,000	74,275,000
Measured at fair value on a recurring basis: | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage loans held-for-sale	40,545,000		26,835,000	29,406,000
Loans held-for-investment	45,721,000		60,670,000	61,123,000
MSRs	204,610,000		192,456,000	200,692,000
Derivative assets	4,795,000		4,510,000	3,487,000
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	95,792,000		86,237,000	114,155,000
Measured at fair value on a recurring basis: | Level 3 | U.S. government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities	0		$ 0	$ 0
Mortgage loans held-for-sale	$ 40,545,000
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	0.0683
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	0.0675
MSRs, measurement input	0.01
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	0.0683
MSRs, measurement input	0.36
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	0.0683
Loans held-for-investment, measurement input	0.0683
MSRs, measurement input	0.1098
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	0.13
Loans held-for-investment, measurement input	0.17
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	0.0036
Loans held-for-investment, measurement input	0.0110
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	0.0786
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	0.90
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	0.0786
MSRs, measurement input	0.0786
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	10.6
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	5.9
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	77
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	361
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	0.04
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	0.8117
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	$ 118,286,000
Other real estate owned	19,731,000
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	118,286,000
Other real estate owned	$ 19,731,000
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 - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Financial Assets:
Interest-bearing deposits with banks	$ 2,824,314	$ 2,084,323	$ 2,163,708
Available-for-sale securities	4,329,957	3,502,915	3,492,481
Held-to-maturity securities	3,060,467	3,215,468	2,887,891
Equity securities with readily determinable fair value	112,173	139,268	116,275
FHLB and FRB stock, at cost	256,495	205,003	195,117
Brokerage customer receivables	13,682	10,592	15,722
Mortgage loans held-for-sale, at fair value	411,851	292,722	338,728
Accrued interest receivable and other	1,671,334	1,551,899	1,455,748
Financial Liabilities
FHLB advances	3,176,309	2,326,071	2,026,071
Other borrowings	606,579	645,813	665,219
Subordinated notes	298,113	437,866	437,628
Junior subordinated debentures	253,566	253,566	253,566
Carrying Value
Financial Assets:
Cash and cash equivalents	415,524	423,464	513,917
Interest-bearing deposits with banks	2,824,314	2,084,323	2,163,708
Available-for-sale securities	4,329,957	3,502,915	3,492,481
Held-to-maturity securities	3,755,924	3,856,916	3,564,473
Trading account securities	4,134	4,707	3,027
Equity securities with readily determinable fair value	112,173	139,268	116,275
FHLB and FRB stock, at cost	256,495	205,003	195,117
Brokerage customer receivables	13,682	10,592	15,722
Mortgage loans held-for-sale, at fair value	411,851	292,722	338,728
Nonqualified deferred compensation assets	16,041	15,238	14,796
Derivative assets	243,860	275,726	294,748
Accrued interest receivable and other	505,504	477,832	434,553
Total	57,564,990	53,420,537	52,170,953
Financial Liabilities
Non-maturity deposits	38,778,256	38,772,098	37,682,437
Time certificates of deposit	9,270,770	6,625,072	6,356,270
FHLB advances	3,176,309	2,326,071	2,026,071
Other borrowings	606,579	645,813	665,219
Subordinated notes	298,113	437,866	437,628
Junior subordinated debentures	253,566	253,566	253,566
Derivative liabilities	317,659	267,255	391,172
Accrued interest payable	66,373	51,116	45,359
Total financial liabilities	52,767,625	49,378,857	47,857,722
Carrying Value | Loans held-for-investment, at fair value
Financial Assets:
Loans held-for-investment	135,834	155,261	193,953
Carrying Value | Loans held-for-investment, at amortized cost
Financial Assets:
Loans held-for-investment	44,539,697	41,976,570	40,829,455
Fair Value
Financial Assets:
Cash and cash equivalents	415,524	423,464	513,917
Interest-bearing deposits with banks	2,824,314	2,084,323	2,163,708
Available-for-sale securities	4,329,957	3,502,915	3,492,481
Held-to-maturity securities	3,060,467	3,215,468	2,887,891
Trading account securities	4,134	4,707	3,027
Equity securities with readily determinable fair value	112,173	139,268	116,275
FHLB and FRB stock, at cost	256,495	205,003	195,117
Brokerage customer receivables	13,682	10,592	15,722
Mortgage loans held-for-sale, at fair value	411,851	292,722	338,728
Nonqualified deferred compensation assets	16,041	15,238	14,796
Derivative assets	243,860	275,726	294,748
Accrued interest receivable and other	505,504	477,832	434,553
Total	55,791,155	51,892,529	50,807,892
Financial Liabilities
Non-maturity deposits	38,778,256	38,772,098	37,682,437
Time certificates of deposit	9,248,374	6,603,746	6,300,161
FHLB advances	3,195,138	2,367,107	2,072,317
Other borrowings	605,305	643,755	662,156
Subordinated notes	273,666	413,501	405,762
Junior subordinated debentures	253,571	253,579	253,562
Derivative liabilities	317,659	267,255	391,172
Accrued interest payable	66,373	51,116	45,359
Total financial liabilities	52,738,342	49,372,157	47,812,926
Fair Value | Loans held-for-investment, at fair value
Financial Assets:
Loans held-for-investment	135,834	155,261	193,953
Fair Value | Loans held-for-investment, at amortized cost
Financial Assets:
Loans held-for-investment	$ 43,461,319	$ 41,090,010	$ 40,142,976

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Shares available for future grants (in shares)	662		662
Stock-based compensation expense	$ 9,000	$ 8,100	$ 18,100	$ 16,400
Aggregate intrinsic value of options exercised			50	2,500
Cash received from option exercises			$ 25	$ 2,200

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Common Shares
Outstanding at beginning of the period (in shares)	13,100	68,093
Granted (in shares)	0	0
Exercised (in shares)	(775)	(54,218)
Forfeited or canceled (in shares)	0	0
Outstanding at end of the period (in shares)	12,325	13,875
Exercisable (in shares)	12,325	13,875
Weighted Average Strike Price
Outstanding at beginning of period (usd per share)	$ 42.76	$ 41.14
Granted (usd per share)	0	0
Exercised (usd per share)	32.26	40.87
Forfeited or canceled (usd per share)	0	0
Outstanding at end of period (usd per share)	43.42	42.18
Exercisable (usd per share)	$ 43.42	$ 42.18
Stock Options Additional Disclosures
Remaining contractual term, outstanding	4 years	4 years 6 months
Remaining contractual term, exercisable	4 years	4 years 6 months
Intrinsic value, outstanding	$ 680	$ 422
Intrinsic value, exercisable	$ 680	$ 422

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans - Schedule of Plans' Restricted and Performance Share Award Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Restricted shares
Common Shares
Outstanding, beginning of the period (in shares)	746,123	610,155
Granted (in shares)	389,198	260,173
Vested and issued (in shares)	(228,719)	(103,161)
Expired, canceled or forfeited (in shares)	(7,893)	(7,638)
Outstanding, end of the period (in shares)	898,709	759,529
Vested, but deferred (in shares)	99,844	98,247
Weighted Average Grant-Date Fair Value
Outstanding, beginning of period (usd per share)	$ 79.60	$ 73.21
Granted (usd per share)	99.50	88.29
Vested and issued (usd per share)	69.54	64.08
Canceled or forfeited (usd per share)	91.47	82.82
Outstanding, end of period (usd per share)	90.68	79.52
Vested, but deferred (usd per share)	$ 53.98	$ 53.35
Performance-based stock
Common Shares
Outstanding, beginning of the period (in shares)	553,026	545,379
Granted (in shares)	96,952	186,313
Added by performance factor at vesting (in shares)	111,304	23,161
Vested and issued (in shares)	(295,644)	(178,203)
Expired, canceled or forfeited (in shares)	(3,154)	(7,909)
Outstanding, end of the period (in shares)	462,484	568,741
Vested, but deferred (in shares)	21,593	36,438
Weighted Average Grant-Date Fair Value
Outstanding, beginning of period (usd per share)	$ 79.69	$ 70.30
Granted (usd per share)	58.78	92.45
Added by performance factor at vesting (usd per share)	100.44	63.64
Vested and issued (usd per share)	58.69	63.64
Canceled or forfeited (usd per share)	95.94	82.73
Outstanding, end of period (usd per share)	93.61	79.20
Vested, but deferred (usd per share)	$ 43.95	$ 44.99

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income or Loss and Earnings Per Share - Schedule of Components of Other Comprehensive Income or Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 5,436,400	$ 5,015,506	$ 5,399,526	$ 4,796,838
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(41,250)	(117,098)	(179,725)	(59,206)
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax	14,210	10,464	28,805	12,804
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	(10)	(20)	(47)	(52)
Net other comprehensive income (loss) during the period, net of tax	(27,050)	(106,654)	(150,967)	(46,454)
Ending balance	5,536,628	5,041,912	5,536,628	5,041,912
Accumulated Unrealized (Losses) Gains on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(408,002)	(351,995)	(350,697)	(386,057)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(15,275)	(33,909)	(72,562)	594
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax	(885)	(1)	(866)	(410)
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	(10)	(20)	(47)	(52)
Net other comprehensive income (loss) during the period, net of tax	(16,170)	(33,930)	(73,475)	132
Ending balance	(424,172)	(385,925)	(424,172)	(385,925)
Accumulated Unrealized Gains (Losses) on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(28,329)	32,809	32,049	7,381
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(23,070)	(88,533)	(98,024)	(65,854)
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax	15,095	10,465	29,671	13,214
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	0	0
Net other comprehensive income (loss) during the period, net of tax	(7,975)	(78,068)	(68,353)	(52,640)
Ending balance	(36,304)	(45,259)	(36,304)	(45,259)
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(48,817)	(48,250)	(42,583)	(48,960)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(2,905)	5,344	(9,139)	6,054
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax	0	0	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	0	0
Net other comprehensive income (loss) during the period, net of tax	(2,905)	5,344	(9,139)	6,054
Ending balance	(51,722)	(42,906)	(51,722)	(42,906)
Accumulated other comprehensive income (loss)
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(485,148)	(367,436)	(361,231)	(427,636)
Ending balance	$ (512,198)	$ (474,090)	$ (512,198)	$ (474,090)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income or Loss and Earnings Per Share - Schedule of Other Comprehensive Income Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
(Losses) gains on investment securities, net	$ (4,282)	$ 0	$ (2,956)	$ 1,398
Income before taxes	211,343	211,430	461,299	454,980
Income tax expense	(58,955)	(56,680)	(121,617)	(120,032)
Interest on Loans	749,812	621,057	1,460,153	1,179,749
Interest on deposits	335,703	213,495	635,235	358,297
Interest on other borrowings	8,700	8,485	17,948	16,339
Net income	152,388	154,750	339,682	334,948
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
(Losses) gains on investment securities, net	1,204	2	1,178	562
Income before taxes	1,204	2	1,178	562
Income tax expense	(319)	(1)	(312)	(152)
Net income	885	1	866	410
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	(20,524)	(14,267)	(40,342)	(18,014)
Income tax expense	5,429	3,802	10,671	4,800
Interest on Loans	23,849	18,661	48,324	27,733
Interest on deposits	(3,325)	(4,657)	(7,982)	(10,245)
Interest on other borrowings	0	263	0	526
Net income	$ (15,095)	$ (10,465)	$ (29,671)	$ (13,214)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income or Loss and Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Equity [Abstract]
Net income	$ 152,388	$ 154,750	$ 339,682	$ 334,948
Less: Preferred stock dividends	6,991	6,991	13,982	13,982
Net income applicable to common shares	$ 145,397	$ 147,759	$ 325,700	$ 320,966
Weighted average common shares outstanding (in shares)	61,839	61,192	61,660	61,072
Effect of dilutive potential common shares
Common stock equivalents (in shares)	926	902	901	933
Average common shares and dilutive common shares (in shares)	62,765	62,094	62,561	62,005
Net income per common share:
Basic (usd per share)	$ 2.35	$ 2.41	$ 5.28	$ 5.26
Diluted (usd per share)	$ 2.32	$ 2.38	$ 5.21	$ 5.18

Accumulated Other Comprehensi_6

Accumulated Other Comprehensive Income or Loss and Earnings Per Share - Narrative (Details) - $ / shares	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2024	Jan. 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2024
Class of Stock [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.45	$ 0.45	$ 0.45	$ 0.40	$ 0.90	$ 0.80
Forecast
Class of Stock [Line Items]
Cash dividends declared per common share (usd per share)							$ 1.80

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands, shares in Millions	Aug. 01, 2024 branch shares	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)
Subsequent Event [Line Items]
Assets		$ 59,781,516	$ 56,259,934	$ 54,286,176
Deposits		48,049,026	$ 45,397,170	$ 44,038,707
Macatawa Bank Corporation
Subsequent Event [Line Items]
Assets		2,700,000
Deposits		2,300,000
Net loans		$ 1,300,000
Subsequent Event | Macatawa Bank Corporation
Subsequent Event [Line Items]
Business acquisition, number of shares issued (in shares) | shares	4.7
Business combination, number of acquired operating branches | branch	26