Old National Bancorp (ONB) 10-K 22 Feb 24 2023 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-15817
Entity Registrant Name	Old National Bancorp
Entity Incorporation, State or Country Code	IN
Entity Tax Identification Number	35-1539838
Entity Address, Address Line One	One Main Street
Entity Address, City or Town	Evansville,
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	47708
City Area Code	800
Local Phone Number	731-2265
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 4,029,030,047
Entity Common Stock, Shares Outstanding (in shares)		292,704,000
Documents Incorporated by Reference	Portions of the Proxy Statement for the 2024 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000707179
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common stock, no par value
Trading Symbol	ONB
Security Exchange Name	NASDAQ
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series A
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	ONBPP
Security Exchange Name	NASDAQ
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series C
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series C
Trading Symbol	ONBPO
Security Exchange Name	NASDAQ

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Chicago, Illinois

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 430,866	$ 453,432
Money market and other interest-earning investments	744,192	274,980
Total cash and cash equivalents	1,175,058	728,412
Equity securities, at fair value	80,372	52,507
Investment securities - available-for-sale, at fair value (amortized cost $7,684,889 and $7,772,603, respectively)	6,713,055	6,773,712
Investment securities - held-to-maturity, at amortized cost (fair value $2,601,188 and $2,643,682, respectively)	3,013,493	3,089,147
Federal Home Loan Bank/Federal Reserve Bank stock, at cost	365,588	314,168
Loans held-for-sale, at fair value	32,006	11,926
Loans:
Total loans, net of unearned income	32,991,927	31,123,641
Allowance for credit losses on loans	(307,610)	(303,671)
Net loans	32,684,317	30,819,970
Premises and equipment, net	565,396	557,307
Goodwill	1,998,716	1,998,716
Other intangible assets	102,250	126,405
Company-owned life insurance	767,902	768,552
Accrued interest receivable and other assets	1,591,683	1,522,550
Total assets	49,089,836	46,763,372
Deposits:
Noninterest-bearing demand	9,664,247	11,930,798
Interest-bearing:
Checking and NOW	7,331,487	8,340,955
Savings	5,099,186	6,326,158
Money market	9,561,116	5,389,139
Time deposits	5,579,144	3,013,780
Total deposits	37,235,180	35,000,830
Federal funds purchased and interbank borrowings	390	581,489
Securities sold under agreements to repurchase	285,206	432,804
Federal Home Loan Bank advances	4,280,681	3,829,018
Other borrowings	764,870	743,003
Accrued expenses and other liabilities	960,609	1,047,633
Total liabilities	43,526,936	41,634,777
Commitments and contingencies (Note 20)
Shareholders’ Equity
Preferred stock, 2,000 shares authorized, 231 shares issued and outstanding	230,500	230,500
Common stock, no par value, $1.00 per share stated value, 600,000 shares authorized, 292,655 and 292,903 shares issued and outstanding, respectively	292,655	292,903
Capital surplus	4,159,924	4,174,265
Retained earnings	1,618,630	1,217,349
Accumulated other comprehensive income (loss), net of tax	(738,809)	(786,422)
Total shareholders’ equity	5,562,900	5,128,595
Total liabilities and shareholders’ equity	49,089,836	46,763,372
Commercial
Loans:
Total loans, net of unearned income	9,512,230	9,508,904
Allowance for credit losses on loans	(118,333)	(120,612)
Commercial real estate
Loans:
Total loans, net of unearned income	14,140,629	12,457,070
Allowance for credit losses on loans	(155,099)	(138,244)
Residential real estate
Loans:
Total loans, net of unearned income	6,699,443	6,460,441
Allowance for credit losses on loans	(20,837)	(21,916)
Consumer
Loans:
Total loans, net of unearned income	$ 2,639,625	$ 2,697,226

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale, amortized cost	$ 7,684,889	$ 7,772,603
Investment securities-held-to-maturity, fair value	$ 2,601,188	$ 2,643,682
Preferred stock, shares authorized (in shares)	2,000	2,000
Preferred stock, shares issued (in shares)	231	231
Preferred stock, shares outstanding (in shares)	231	231
Common stock, stated value (in dollars per share)	$ 1	$ 1
Authorized and unissued common shares reserved for issuance (in shares)	600,000	600,000
Common stock, shares issued (in shares)	292,655	292,903
Common stock, shares outstanding (in shares)	292,655	292,903

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans including fees:
Taxable	$ 1,815,390	$ 1,177,816	$ 490,042
Nontaxable	44,687	25,931	12,392
Investment securities:
Taxable	263,210	204,004	98,031
Nontaxable	43,851	43,637	37,595
Money market and other interest-earning investments	39,683	2,814	589
Total interest income	2,206,821	1,454,202	638,649
Interest Expense
Deposits	484,360	49,093	10,954
Federal funds purchased and interbank borrowings	11,412	5,021	0
Securities sold under agreements to repurchase	3,299	843	397
Federal Home Loan Bank advances	161,860	51,524	21,075
Other borrowings	42,737	19,785	9,823
Total interest expense	703,668	126,266	42,249
Net interest income	1,503,153	1,327,936	596,400
Provision (release) for credit losses	58,887	144,799	(29,622)
Net interest income after provision (release) for credit losses	1,444,266	1,183,137	626,022
Noninterest Income
Wealth and investment services fees	107,784	100,851	65,048
Service charges on deposit accounts	71,945	72,501	31,658
Debit card and ATM fees	42,153	40,227	23,766
Mortgage banking revenue	16,319	23,015	42,558
Capital markets income	24,419	25,986	21,997
Company-owned life insurance	15,397	14,564	10,589
Debt securities gains (losses), net	(6,265)	(88)	4,327
Gain on sale of Visa Class B restricted shares	21,635	0	0
Gain on sale of health savings accounts	0	90,673	0
Other income	39,955	32,050	14,276
Total noninterest income	333,342	399,779	214,219
Noninterest Expense
Salaries and employee benefits	546,364	575,626	284,098
Occupancy	106,676	100,421	54,834
Equipment	32,163	27,637	16,704
Marketing	39,511	32,264	12,684
Technology	80,343	84,865	47,047
Communication	16,980	18,846	10,073
Professional fees	27,335	39,046	20,077
FDIC assessment	56,730	19,332	6,059
Amortization of intangibles	24,155	25,857	11,336
Amortization of tax credit investments	15,367	10,961	6,770
Property optimization	1,559	26,818	0
Other expense	79,123	76,510	31,697
Total noninterest expense	1,026,306	1,038,183	501,379
Income before income taxes	751,302	544,733	338,862
Income tax expense	169,310	116,446	61,324
Net income	581,992	428,287	277,538
Preferred dividends	(16,135)	(14,118)	0
Net income applicable to common shareholders	$ 565,857	$ 414,169	$ 277,538
Net income per common share - basic (in dollars per share)	$ 1.95	$ 1.51	$ 1.68
Net income per common share - diluted (in dollars per share)	$ 1.94	$ 1.50	$ 1.67
Weighted average number of common shares outstanding - basic (in shares)	290,748	275,179	165,178
Weighted average number of common shares outstanding - diluted (in shares)	291,855	276,688	165,929
Dividends per common share (in dollars per share)	$ 0.56	$ 0.56	$ 0.56

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 581,992	$ 428,287	$ 277,538
Change in debt securities available-for-sale:
Unrealized holding gains (losses) for the period	(31,355)	(1,004,054)	(187,955)
Reclassification for securities transferred to held-to-maturity	0	165,473	0
Reclassification adjustment for securities (gains) losses realized in income	6,265	88	(4,327)
Income tax effect	14,918	199,097	43,997
Unrealized gains (losses) on available-for-sale debt securities	(10,172)	(639,396)	(148,285)
Change in securities held-to-maturity:
Adjustment for securities transferred from available-for-sale	0	(165,473)	0
Amortization of unrealized losses on securities transferred     from available-for-sale	21,239	16,612	0
Income tax effect	(4,047)	36,197	0
Changes from securities held-to-maturity	17,192	(112,664)	0
Change in hedges:
Net unrealized derivative gains (losses) on hedges	69,276	(45,132)	1,898
Reclassification adjustment for (gains) losses realized in net income	(15,067)	2,587	(4,605)
Income tax effect	(13,479)	10,453	666
Changes from hedges	40,730	(32,092)	(2,041)
Change in defined benefit pension plans:
Amortization of net (gains) losses recognized in income	(182)	139	239
Income tax effect	45	(34)	(59)
Changes from defined benefit pension plans	(137)	105	180
Other comprehensive income (loss), net of tax	47,613	(784,047)	(150,146)
Comprehensive income (loss)	$ 629,605	$ (355,760)	$ 127,392

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Total	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2020	$ 2,972,656,000	$ 0	$ 165,367,000	$ 1,875,626,000	$ 783,892,000	$ 147,771,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	277,538,000				277,538,000
Other comprehensive income (loss)	(150,146,000)					(150,146,000)
Cash dividends:
Dividends - common stock	(92,829,000)				(92,829,000)
Common stock issued	583,000		35,000	548,000
Common stock repurchased	(3,731,000)		(208,000)	(3,523,000)
Share-based compensation expense	7,497,000			7,497,000
Stock activity under incentive compensation plans	450,000		644,000	397,000	(591,000)
Ending Balance at Dec. 31, 2021	3,012,018,000	0	165,838,000	1,880,545,000	968,010,000	(2,375,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	428,287,000				428,287,000
Other comprehensive income (loss)	(784,047,000)					(784,047,000)
First Midwest Bancorp, Inc. merger:
Issuance of common stock	2,446,312,000		129,365,000	2,316,947,000
Issuance of preferred stock, net of issuance costs	243,719,000	230,500,000		13,219,000
Cash dividends:
Dividends - common stock	(163,505,000)				(163,505,000)
Preferred ($70.00 per share)	(14,118,000)				(14,118,000)
Common stock issued	809,000		52,000	757,000
Common stock repurchased	(71,182,000)		(3,960,000)	(67,222,000)
Share-based compensation expense	28,656,000			28,656,000
Stock activity under incentive compensation plans	1,646,000		1,608,000	1,363,000	(1,325,000)
Ending Balance at Dec. 31, 2022	5,128,595,000	230,500,000	292,903,000	4,174,265,000	1,217,349,000	(786,422,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	581,992,000				581,992,000
Other comprehensive income (loss)	47,613,000					47,613,000
First Midwest Bancorp, Inc. merger:
Issuance of common stock			129,365,000
Cash dividends:
Dividends - common stock	(163,895,000)				(163,895,000)
Preferred ($70.00 per share)	(16,135,000)				(16,135,000)
Common stock issued	1,076,000		75,000	1,001,000
Common stock repurchased	(44,308,000)		(2,640,000)	(41,668,000)
Share-based compensation expense	27,910,000			27,910,000
Stock activity under incentive compensation plans	52,000		2,317,000	(1,584,000)	(681,000)
Ending Balance at Dec. 31, 2023	$ 5,562,900,000	$ 230,500,000	$ 292,655,000	$ 4,159,924,000	$ 1,618,630,000	$ (738,809,000)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends per common share (in dollars per share)	$ 0.56	$ 0.56
Preferred dividends (in dollars per share)	$ 70	$ 61.25

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities
Net income	$ 581,992	$ 428,287	$ 277,538
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	38,180	36,436	27,276
Amortization of other intangible assets	24,155	25,857	11,336
Amortization of tax credit investments	15,367	10,961	6,770
Net premium amortization on investment securities	7,416	18,684	16,305
Accretion income related to acquired loans	(22,191)	(72,007)	(16,747)
Share-based compensation expense	27,910	28,656	7,497
Provision (release) for credit losses	58,887	144,799	(29,622)
Debt securities (gains) losses, net	6,265	88	(4,327)
Gain on sale of Visa Class B restricted shares	(21,635)	0	0
Gain on sale of health savings accounts	0	(90,673)	0
Net (gains) losses on sales of loans and other assets	(3,074)	13,114	(36,677)
Increase in cash surrender value of company-owned life insurance	(15,397)	(14,564)	(10,589)
Residential real estate loans originated for sale	(473,478)	(570,111)	(1,215,015)
Proceeds from sales of residential real estate loans	472,537	620,958	1,274,812
(Increase) decrease in interest receivable	(34,637)	(52,911)	1,198
(Increase) decrease in other assets	(66,070)	(40,518)	2,641
Increase (decrease) in accrued expenses and other liabilities	(79,885)	327,369	17,984
Net cash flows provided by (used in) operating activities	516,342	814,425	330,380
Cash Flows From Investing Activities
Cash received from merger, net	0	1,912,629	0
Sale of health savings accounts	0	(290,857)	0
Purchases of investment securities available-for-sale	(1,084,416)	(1,438,572)	(3,321,653)
Purchases of investment securities held-to-maturity	(1,941)	(170,675)	0
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock	(99,158)	(147,394)	0
Purchases of equity securities	(28,408)	(6,348)	(11,000)
Proceeds from maturities, prepayments, and calls of investment securities    available-for-sale	1,066,266	1,284,814	1,511,510
Proceeds from sales of investment securities available-for-sale	96,506	20,032	198,886
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity	94,511	83,962	0
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock	47,738	108,698	58
Proceeds from sales of equity securities	24,636	53,029	544
Loan originations and payments, net	(2,673,593)	(3,071,765)	206,145
Proceeds from sales of commercial loans	757,593	0	0
Proceeds from company-owned life insurance death benefits	16,252	10,361	3,375
Proceeds from sale of premises and equipment and other assets	3,513	4,480	29,244
Purchases of premises and equipment and other assets	(38,375)	(37,901)	(48,692)
Net cash flows provided by (used in) investing activities	(1,818,876)	(1,685,507)	(1,431,583)
Net increase (decrease) in:
Deposits	2,234,350	(435,717)	1,531,742
Federal funds purchased and interbank borrowings	(581,099)	581,213	(890)
Securities sold under agreements to repurchase	(147,598)	(94,665)	(38,891)
Other borrowings	16,938	177,146	36,187
Payments for maturities of Federal Home Loan Bank advances	(2,250,149)	(2,102,506)	(146,505)
Payments for modification of Federal Home Loan Bank advances	0	0	(2,156)
Proceeds from Federal Home Loan Bank advances	2,700,000	2,900,000	50,000
Cash dividends paid	(180,030)	(177,623)	(92,829)
Common stock repurchased	(44,308)	(71,182)	(3,731)
Common stock issued	1,076	809	583
Net cash flows provided by (used in) financing activities	1,749,180	777,475	1,333,510
Net increase (decrease) in cash and cash equivalents	446,646	(93,607)	232,307
Cash and cash equivalents at beginning of period	728,412	822,019	589,712
Cash and cash equivalents at end of period	$ 1,175,058	$ 728,412	$ 822,019

Nature of Operations

Nature of Operations	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	NATURE OF OPERATIONS Old National Bancorp, the financial holding company of Old National Bank, our wholly-owned banking subsidiary, is headquartered in Evansville, Indiana with commercial and consumer banking operations headquartered in Chicago, Illinois. Through Old National Bank and non-bank affiliates, Old National Bancorp provides a wide range of services to its clients throughout the Midwest region and elsewhere, including commercial and consumer loan and depository services, private banking, capital markets, brokerage, wealth management, trust, investment advisory, and other traditional banking services.

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying consolidated financial statements include the accounts of Old National Bancorp and its wholly-owned subsidiaries (hereinafter collectively referred to as “Old National”) and have been prepared in conformity with accounting principles generally accepted in the United States of America and prevailing practices within the banking industry. Such principles require management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosures of contingent assets and liabilities at the date of the financial statements and amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. All intercompany transactions and balances have been eliminated. Certain prior year amounts have been reclassified to conform to the current presentation. Such reclassifications had no effect on prior year net income or shareholders’ equity and were insignificant amounts. Equity Securities Equity securities consist of mutual funds for Community Reinvestment Act qualified investments and diversified investment securities held in a grantor trust for participants in the Company’s nonqualified deferred compensation plan. Equity securities are recorded at fair value with changes in fair value recognized in other income. Investment Securities Old National classifies debt investment securities as available-for-sale or held-to-maturity on the date of purchase. Debt securities classified as available-for-sale are recorded at fair value with the unrealized gains and losses recorded in other comprehensive income (loss), net of tax. Realized gains and losses affect income and the prior fair value adjustments are reclassified within shareholders’ equity. Debt securities classified as held-to-maturity, which management has the intent and ability to hold to maturity, are reported at amortized cost. Interest income includes amortization of purchase premiums or discounts. Premiums and discounts are amortized on the level-yield method. Anticipated prepayments are considered when amortizing premiums and discounts on mortgage-backed securities. Gains and losses on the sale of available-for-sale debt securities are determined using the specific-identification method. Available-for-sale securities in unrealized loss positions are evaluated at least quarterly to determine if a decline in fair value should be recorded through income or other comprehensive income (loss). For available-for-sale securities in an unrealized loss position, we first assess whether we intend to sell, or it is more likely than not that we will be required to sell the security, before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For available-for-sale securities that do not meet the criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security and the issuer, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded, limited to the amount that the fair value of the security is less than its amortized cost basis. Any decline in fair value that has not been recorded through an allowance for credit losses is recognized in other comprehensive income (loss), net of applicable taxes. Accrued interest receivable on the securities portfolio is excluded from the estimate of credit losses. Federal Home Loan Bank/Federal Reserve Bank Stock Old National is a member of the FHLB system and its regional Federal Reserve Bank. Members are required to own a certain amount of stock based on the level of borrowings and other factors. FHLB and Federal Reserve Bank stock are carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. Loans Held-for-Sale Loans that Old National has originated with an intent to sell are classified as loans held-for-sale and are recorded at fair value, determined individually, as of the balance sheet date. The loan’s fair value includes the servicing value of the loans as well as any accrued interest. Conventional mortgage production is sold with servicing rights retained. Certain loans, such as government guaranteed mortgage loans are sold on servicing released basis. Loans Loans that Old National intends to hold are classified as held for investment. Loans held for investment are carried at the principal balance outstanding, net of earned interest, purchase premiums or discounts, deferred loan fees and costs, and an allowance for credit losses. Interest income is accrued on the principal balances of loans outstanding. For all loan classes, a loan is generally placed on nonaccrual status when principal or interest becomes 90 days past due unless it is well secured and in the process of collection, or earlier when concern exists as to the ultimate collectability of principal or interest. Interest accrued but not received is reversed against earnings. Cash interest received on these loans is applied to the principal balance until the principal is recovered or until the loan returns to accrual status. Loans may be returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for a prescribed period, and future payments are reasonably assured. Old National has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. Evidence of credit deterioration was evaluated using various indicators, such as past due and nonaccrual status, as well as asset quality rating. PCD loans are recorded at the amount paid. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and initial allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is accreted or amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. Any loans that are modified are reviewed by Old National to identify if a financial difficulty modification has occurred, which is when Old National modifies a loan related to a borrower experiencing financial difficulties. Terms may be modified to fit the ability of the borrower to repay in line with its current financial status. The modification of the terms of such loans includes one or a combination of the following: a reduction of the stated interest rate of the loan, an extension of the maturity date, a permanent reduction of the recorded investment of the loan, or an other-than-insignificant payment delay. The adoption of Accounting Standards Update (“ASU”) 2022-02 on January 1, 2023 eliminated the recognition and measurement of troubled debt restructurings (“TDRs”) and enhanced disclosures for modifications to loans related to borrowers experiencing financial difficulties. Allowance for Credit Losses on Loans Credit quality within the loans held for investment portfolio is continuously monitored by management and is reflected within the allowance for credit losses on loans. The allowance for credit losses is an estimate of expected losses inherent within the Company’s loans held for investment portfolio. Credit quality is assessed and monitored by evaluating various attributes and the results of those evaluations are utilized in underwriting new loans and in our process for estimating expected credit losses. The allowance for credit losses on loans held for investment is adjusted by a credit loss expense, which is reported in provision for credit losses, and reduced by the charge-off of loan amounts, net of recoveries within the provision for credit losses. Accrued interest receivable is excluded from the estimate of credit losses. Old National has made a policy election to present accrued interest receivable separately on the balance sheet. The allowance for credit loss estimation process involves procedures to appropriately consider the unique characteristics of our loan portfolio segments. These segments are further disaggregated into loan classes based on the level at which credit risk is monitored. When computing the level of expected credit losses, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status, and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense in those future periods. The allowance level is influenced by loan volumes, loan AQR migration or delinquency status, changes in historical loss experience, and other conditions influencing loss expectations, such as reasonable and supportable forecasts of economic conditions. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: first, an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans; and second, a pooled component for estimated expected credit losses for pools of loans that share similar risk characteristics. We utilize a discounted cashflow approach to determine the allowance for credit losses for performing loans and nonperforming loans. Expected cashflows are created for each loan and discounted using the effective yield method. The discounted sum of expected cashflows is then compared to the amortized cost and any shortfall is recorded as an allowance. Expected cashflows are created using a combination of contractual payment schedules, calculated PDs, LGD, and prepayment assumptions as well as qualitative factors. For commercial and commercial real estate loans, the PD is forecasted using a regression model to determine the likelihood of a loan moving into nonaccrual within the time horizon. For residential and consumer loans, the PD is forecasted using a regression model to determine the likelihood of a loan being charged-off within the time horizon. The regression models use combinations of variables to assess systematic and unsystematic risk. Variables used for unsystematic risk are borrower specific and help to gauge the risk of default from an individual borrower. Variables for systematic risk, risk inherent to all borrowers, come from the use of forward-looking economic forecasts and include variables such as unemployment rate, gross domestic product, and house price index. The LGD is defined as credit loss incurred when an obligor of the bank defaults. Qualitative factors include items such as changes in lending policies or procedures and economic uncertainty in forward-looking forecasts. Further information regarding Old National’s policies and methodology used to estimate the allowance for credit losses on loans is presented in Note 4 to the consolidated financial statements. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Land is stated at cost. Depreciation is charged to operating expense over the useful lives of the assets, principally on the straight-line method. Useful lives for premises and equipment are as follows: buildings and building improvements – 10 to 39 years; and furniture and equipment – 3 to 7 years. Leasehold improvements are depreciated over the lesser of their useful lives or the term of the lease. Maintenance and repairs are expensed as incurred while major additions and improvements are capitalized. Interest costs on construction of qualifying assets are capitalized. Premises and equipment are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are adjusted to fair value. Such impairments are included in other expense. Goodwill and Other Intangible Assets Goodwill arises from business combinations and is determined as the excess of the cost of acquired entities over the fair value of identifiable assets acquired less liabilities assumed as of the merger or acquisition date. Amortization of goodwill and indefinite-lived assets is not recorded. However, the recoverability of goodwill and other intangible assets are tested for impairment at least annually or more frequently if events and circumstances exist that indicate that a goodwill impairment test should be performed. Other intangible assets, including core deposits and customer business relationships, are amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of 5 to 15 years. Company-Owned Life Insurance Old National has purchased, as well as obtained through mergers and acquisitions, life insurance policies on certain key executives. Old National records company-owned life insurance at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. Loan Servicing Rights When loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gain on sales of loans. Fair value is based on market prices for comparable servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Loan servicing rights are included in other assets on the balance sheet. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics, such as interest rate, loan type, term, and investor type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If Old National later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income. Changes in valuation allowances are reported with mortgage banking revenue on the income statement. The fair values of servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Servicing fee income, which is reported on the income statement as mortgage banking revenue, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal, or a fixed amount per loan, and are recorded as income when earned. Derivative Financial Instruments As part of Old National’s overall interest rate risk management, Old National uses derivative instruments, including interest rate swaps, collars, caps, and floors. All derivative instruments are recognized on the balance sheet at their fair value. At the inception of the derivative contract, Old National designates the derivative as (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), (2) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), or (3) an instrument with no hedging designation (“stand-alone derivative”). For a fair value hedge, the change in value of the derivative, as well as the offsetting change in value of the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. For a cash flow hedge, the gain or loss on the derivative is reported as a component of other comprehensive income (loss) and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, in noninterest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in noninterest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged. Old National formally documents all relationships between derivatives and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. Old National also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used in hedging transactions are highly effective in offsetting changes in fair values or cash flows of the hedged items. Old National discontinues hedge accounting prospectively when it is determined that (1) the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item; (2) the derivative expires, is sold, or terminated; (3) the derivative instrument is de-designated as a hedge because the forecasted transaction is no longer probable of occurring; (4) a hedged firm commitment no longer meets the definition of a firm commitment; or (5) management otherwise determines that designation of the derivative as a hedging instrument is no longer appropriate. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as noninterest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transaction is still expected to occur, changes in value that were accumulated in other comprehensive income (loss) are amortized or accreted into earnings over the same periods which the hedged transactions will affect earnings. Old National enters into various stand-alone mortgage-banking derivatives in order to hedge the risk associated with the fluctuation of interest rates. Changes in fair value are recorded as mortgage banking revenue. Old National also enters into various stand-alone derivative contracts to provide derivative products to clients, which are carried at fair value with changes in fair value recorded as other noninterest income. Old National is exposed to losses if a counterparty fails to make its payments under a contract in which Old National is in the net receiving position. Old National anticipates that the counterparties will be able to fully satisfy their obligations under the agreements. In addition, Old National obtains collateral above certain thresholds of the fair value of its hedges for each counterparty based upon their credit standing. All of the contracts to which Old National is a party settle monthly, quarterly, or semiannually. Further, Old National has netting agreements with the dealers with which it does business. Credit-Related Financial Instruments In the ordinary course of business, Old National’s bank subsidiary has entered into credit-related financial instruments consisting of commitments to extend credit, commercial letters of credit, and standby letters of credit. The notional amount of these commitments is not reflected in the consolidated financial statements until they are funded. Old National maintains an allowance for credit losses on unfunded loan commitments to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for credit losses on loans, modified to take into account the probability of a drawdown on the commitment. The allowance for credit losses on unfunded loan commitments is classified as a liability account on the balance sheet and is adjusted as a provision for unfunded loan commitments included in the provision for credit losses. Repossessed Collateral Other real estate owned and repossessed personal property are initially recorded at the fair value of the property less estimated cost to sell and are included in other assets on the balance sheet. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan through the completion of a deed in lieu of foreclosure or through a similar legal agreement. Any excess recorded investment over the fair value of the property received is charged to the allowance for credit losses. Any subsequent write-downs are recorded in noninterest expense, as are the costs of operating the properties. Gains or losses resulting from the sale of collateral are recognized in noninterest expense at the date of sale. Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase We purchase certain securities, generally U.S. government-sponsored entity and agency securities, under agreements to resell. The amounts advanced under these agreements represent short-term secured loans and are reflected as assets in the accompanying consolidated balance sheets. We also sell certain securities under agreements to repurchase. These agreements are treated as collateralized financing transactions. These secured borrowings are reflected as liabilities in the accompanying consolidated balance sheets and are recorded at the amount of cash received in connection with the transaction. Short-term securities sold under agreements to repurchase generally mature within one Share-Based Compensation Compensation cost is recognized for stock options, stock appreciation rights, and restricted stock awards and units issued to employees based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options and appreciation rights, while the market price of our Common Stock at the date of grant is used for restricted stock awards. The market price of our Common Stock at the date of grant less the present value of dividends expected to be paid during the performance period is used for restricted stock units where the performance measure is based on an internal performance measure. A third-party provider is used to value certain restricted stock units where the performance measure is based on total shareholder return. Compensation expense is recognized over the required service period. Forfeitures are recognized as they occur. FDIC Special Assessment On November 16, 2023, the FDIC finalized a rule that imposes special assessments to recover the losses to the Deposit Insurance Fund (“DIF”) resulting from the FDIC’s use, in March 2023, of the systemic risk exception to the least-cost resolution test under the Federal Deposit Insurance Act in connection with the receiverships of Silicon Valley Bank and Signature Bank. The FDIC estimated in approving the rule that those assessed losses total approximately $16.3 billion. The rule provides that this loss estimate will be periodically adjusted, which will affect the amount of the special assessment. Under the rule, the assessment base is the estimated uninsured deposits that an insured depository institution (“IDI”) reported in its December 31, 2022 Call Report, excluding the first $5 billion in estimated uninsured deposits. The special assessments will be collected at an annual rate of approximately 13.4 basis points per year (3.36 basis points per quarter) over eight quarters in 2024 and 2025, with the first assessment period beginning January 1, 2024. Because the estimated loss pursuant to the systemic risk determination will be periodically adjusted, the FDIC retains the ability to cease collection early, extend the special assessment collection period and impose a final shortfall special assessment on a one-time basis. In its December 31, 2022 Call Report, Old National Bank reported estimated uninsured deposits of approximately $12.0 billion. The Company expects the special assessments to be tax deductible. The total of the special assessments for Old National Bank is estimated at $19.1 million, and such amount was recorded within FDIC assessment expense in the year ending December 31, 2023. Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. We recognize a tax position as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. We recognize interest and/or penalties related to income tax matters in income tax expense. Old National is a limited partner in several tax-advantaged limited partnerships whose purpose is to invest in approved qualified affordable housing, renewable energy, or other renovation or community revitalization projects. These investments are included in other assets on the balance sheet, with any unfunded commitments included with other liabilities. Certain of these assets qualify for the proportional amortization method and are amortized over the period that Old National expects to receive the tax credits, with the expense included within income tax expense on the consolidated statements of income. The other investments are accounted for under the equity method, with the expense included within noninterest expense on the consolidated statements of income. All of our tax credit investments are evaluated for impairment at the end of each reporting period. Loss Contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. See Note 20 to the consolidated financial statements for further disclosure. Cash Equivalents and Cash Flows For the purpose of presentation in the accompanying consolidated statement of cash flows, cash and cash equivalents are defined as cash, due from banks, federal funds sold and resell agreements, and money market investments, which have maturities less than 90 days. Cash flows from loans, either originated or acquired, are classified at that time according to management’s intent to either sell or hold the loan for the foreseeable future. When management’s intent is to sell the loan, the cash flows of that loan are presented as operating cash flows. When management’s intent is to hold the loan for the foreseeable future, the cash flows of that loan are presented as investing cash flows. The following table summarizes supplemental cash flow information: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash payments: Interest $ 666,121 $ 118,165 $ 42,196 Income taxes, net of refunds 190,303 66,109 31,875 Noncash Investing and Financing Activities: Securities transferred from available-for-sale to held-to-maturity — 2,986,736 — Transfer of premises and equipment to assets held-for-sale — 7,905 9,539 Operating lease right-of-use assets obtained in exchange for lease obligations 20,260 28,265 776 Finance lease right-of-use assets obtained in exchange for lease obligations 10,019 (966) 7,477 There were 129.4 million shares of Common Stock issued in conjunction with the merger with First Midwest in February of 2022 totaling $2.4 billion in shareholders’ equity . In addition, Old National issued 108,000 shares of Old National Series A Preferred Stock and 122,500 shares of Old National Series C Preferred Stock totaling $243.7 million in shareholders’ equity. Business Combinations Old National accounts for business combinations using the acquisition method of accounting. The accounts of an acquired entity are included as of the date of merger or acquisition, and any excess of purchase price over the fair value of the net assets acquired is capitalized as goodwill. Alternatively, a gain is recorded if the fair value of the net assets acquired exceeds the purchase price. Old National typically issues Common Stock and/or pays cash for a merger or acquisition, depending on the terms of the agreement. The value of Common Stock issued is determined based on the market price of the stock as of the closing of the merger or acquisition. Merger and acquisition costs are expensed when incurred. Revenue From Contracts With Customers Old National’s revenue from contracts with customers in the scope of ASC 606 is recognized within noninterest income. A description of the Company’s significant revenue streams accounted for under ASC 606 follows: Wealth and investment services fees : Old National earns wealth management fees based upon asset custody and investment management services provided to individual and institutional customers. Most of these customers receive monthly or quarterly billings for services rendered based upon the market value of assets in custody. Fees that are transaction based are recognized at the point in time that the transaction is executed. Investment product fees are the commissions and fees received from third-party registered broker/dealers and investment advisers that provide those services to Old National customers. Old National acts as an agent in arranging the relationship between the customer and the third-party service provider. These fees are recognized monthly from the third-party broker based upon services already performed, net of the processing fees charged to Old National by the broker. Service charges on deposit accounts : Old National earns fees from deposit customers for transaction-based, account maintenance, and overdraft services. Transaction-based fees and overdraft fees are recognized at a point in time, since the customer generally has a right to cancel the depository arrangement at any time. The arrangement is considered a day-to-day contract with ongoing renewals and optional purchases, so the duration of the contract does not extend beyond the services already performed. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which Old

Merger, Acquisition, and Divest

Merger, Acquisition, and Divestiture Activity	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Merger, Acquisition, and Divestiture Activity	MERGER, ACQUISITION, AND DIVESTITURE ACTIVITY Merger First Midwest Bancorp, Inc. On February 15, 2022, Old National completed its previously announced merger of equals transaction with First Midwest pursuant to an agreement and plan of merger, dated as of May 30, 2021, to combine in an all-stock transaction. The combined organization has a presence in additional Midwestern markets, strong commercial banking capabilities, a robust retail footprint, a significant wealth management platform, and an enhanced ability to attract talent. The combined organization also creates the scale and profitability to accelerate digital and technology capabilities to drive future investments in consumer and commercial banking, as well as wealth management services. As of December 31, 2022, Old National finalized its valuation of all assets acquired and liabilities assumed. The following table presents a summary of the assets acquired and liabilities assumed, net of the fair value adjustments and the fair value of consideration as of the merger date: (dollars and shares in thousands) February 15, Assets Cash and cash equivalents $ 1,912,629 Investment securities 3,526,278 FHLB/Federal Reserve Bank stock 106,097 Loans held-for-sale 13,809 Loans, net of allowance for credit losses 14,298,873 Premises and equipment 111,867 Operating lease right-of-use assets 129,698 Accrued interest receivable 53,502 Goodwill 961,722 Other intangible assets 117,584 Company-owned life insurance 301,025 Other assets 317,258 Total assets $ 21,850,342 Liabilities Deposits $ 17,249,404 Securities sold under agreements to repurchase 135,194 Federal Home Loan Bank advances 1,158,623 Other borrowings 274,569 Accrued expenses and other liabilities 342,369 Total liabilities $ 19,160,159 Fair value of consideration Preferred stock $ 243,870 Common stock (129,365 shares issued at $18.92 per share) 2,446,312 Total consideration $ 2,690,182 Transaction and integrations costs totaling $28.7 million associated with the merger have been expensed in 2023, compared to $120.9 million of merger-related costs, $11.0 million of provision for credit losses on unfunded commitments, and $96.3 million of provision for credit losses on non-PCD loans acquired in the transaction in 2022. Additional transaction and integration costs will be expensed in future periods as incurred. As a result of the merger, Old National assumed sponsorship of First Midwest’s defined benefit pension plan (the “Pension Plan”) under which both plan participation and benefit accruals had been previously frozen. The Pension Plan was terminated in November 2022, which included the settlement of benefit obligations associated with the Pension Plan. At December 31, 2023, there were no remaining Pension Plan assets. The fair value of Pension Plan assets was $16.6 million at December 31, 2022. Pension costs were not material in 2023 or 2022. Pending Acquisition CapStar Financial Holdings, Inc. On October 26, 2023, Old National announced that it entered into a definitive merger agreement pursuant to which Old National will acquire CapStar Financial Holdings, Inc. (“CapStar”) and its wholly-owned subsidiary, CapStar Bank, in an all-stock transaction. This partnership transaction will strengthen Old National’s recently formed Nashville presence and add several new high-growth markets. As of September 30, 2023, CapStar had approximately $3.3 billion of total assets, $2.3 billion of total loans, and $2.8 billion of deposits. Under the terms of the merger agreement, each outstanding share of CapStar common stock will be converted into the right to receive 1.155 shares of Old National common stock, valuing the transaction at approximately $344.4 million, or $16.64 per share, based on Old National’s 30-day volume weighted average closing stock price ending October 25, 2023, the day prior to execution of the merger agreement. The transaction value is likely to change until closing due to fluctuations in the price of Old National common stock. The definitive merger agreement has been approved by the Board of Directors of each company. The transaction is anticipated to close in the second quarter of 2024 subject to the approval of CapStar shareholders. Divestitures On November 18, 2022, Old National sold its business of acting as a qualified custodian for, and administering, health savings accounts. Old National served as custodian for health savings accounts comprised of both investment accounts and deposit accounts. At closing, the health savings accounts held in deposit accounts that were transferred totaled approximately $382 million and resulted in a $90.7 million pre-tax gain. During the fourth quarter of 2022, Old National initiated certain property optimization actions that included the closure and consolidation of certain branches as well as other real estate repositioning across our footprint. These actions resulted in pre-tax charges of $26.8 million that are associated with valuation adjustments related to these locations and were recorded in noninterest expense.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES The following table summarizes the amortized cost and fair value of the available-for-sale and held-to-maturity investment securities portfolios and the corresponding amounts of gross unrealized gains, unrealized losses, and basis adjustments in AOCI and gross unrecognized gains and losses. (dollars in thousands) Amortized Unrealized Unrealized Basis Adjustments (1) Fair December 31, 2023 Available-for-Sale U.S. Treasury $ 449,817 $ 154 $ (11,941) $ (41,297) $ 396,733 U.S. government-sponsored entities and agencies 1,487,879 33 (192,717) (63,931) 1,231,264 Mortgage-backed securities - Agency 4,835,319 3,093 (621,852) — 4,216,560 States and political subdivisions 554,509 878 (23,057) 2,930 535,260 Pooled trust preferred securities 13,797 — (2,460) — 11,337 Other securities 343,568 449 (22,116) — 321,901 Total available-for-sale securities $ 7,684,889 $ 4,607 $ (874,143) $ (102,298) $ 6,713,055 Held-to-Maturity U.S. government-sponsored entities and agencies $ 825,953 $ — $ (154,827) $ — $ 671,126 Mortgage-backed securities - Agency 1,029,131 — (147,137) — 881,994 States and political subdivisions 1,158,559 1,800 (112,141) — 1,048,218 Allowance for securities held-to-maturity (150) — — — (150) Total held-to-maturity securities $ 3,013,493 $ 1,800 $ (414,105) $ — $ 2,601,188 December 31, 2022 Available-for-Sale U.S. Treasury $ 253,148 $ 5 $ (5,189) $ (47,037) $ 200,927 U.S. government-sponsored entities and agencies 1,451,736 — (169,248) (107,408) 1,175,080 Mortgage-backed securities - Agency 4,986,354 976 (617,428) — 4,369,902 States and political subdivisions 688,159 1,789 (26,096) — 663,852 Pooled trust preferred securities 13,783 — (2,972) — 10,811 Other securities 379,423 258 (26,541) — 353,140 Total available-for-sale securities $ 7,772,603 $ 3,028 $ (847,474) $ (154,445) $ 6,773,712 Held-to-Maturity U.S. government-sponsored entities and agencies $ 819,168 $ — $ (162,810) $ — $ 656,358 Mortgage-backed securities - Agency 1,106,817 — (123,854) — 982,963 States and political subdivisions 1,163,312 221 (159,022) — 1,004,511 Allowance for securities held-to-maturity (150) — — — (150) Total held-to-maturity securities $ 3,089,147 $ 221 $ (445,686) $ — $ 2,643,682 (1) Basis adjustments represent the amount of fair value hedging adjustments included in the carrying amounts of fixed-rate investment securities assets designated in fair value hedging arrangements. See Note 19 to the consolidated financial statements for additional information regarding these derivative financial instruments. Substantially all of the mortgage-backed securities in the investment portfolio are residential mortgage-backed securities. Proceeds from sales or calls of available-for-sale investment securities and the resulting realized gains and realized losses were as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Proceeds $ 154,339 $ 90,840 $ 357,704 Realized gains 1,006 531 4,505 Realized losses (7,271) (619) (178) Investment securities pledged to secure public and other funds had a carrying value of $8.4 billion at December 31, 2023 and $6.1 billion at December 31, 2022. At December 31, 2023, Old National had a concentration of investment securities issued by Indiana and its political subdivisions. The only aggregate market value of the Company’s investment securities greater than 10% of shareholders’ equity were issued by Indiana and its political subdivisions totaling $600.9 million, which represented 10.8% of shareholders’ equity. Of the bonds issued by Indiana, 99.6% are rated “BBB+” or better, and the remaining 0.4% generally represent pre-refunded positions. The table below shows the amortized cost and fair value of the investment securities portfolio by contractual maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Weighted average yield is based on amortized cost. At December 31, 2023 (dollars in thousands) Amortized Fair Weighted Maturity Available-for-Sale Within one year $ 378,992 $ 375,976 4.37 % One to five years 1,875,152 1,736,452 3.14 % Five to ten years 3,944,940 3,408,082 2.39 % Beyond ten years 1,485,805 1,192,545 2.60 % Total $ 7,684,889 $ 6,713,055 2.71 % Held-to-Maturity One to five years $ 161,440 $ 134,333 2.65 % Five to ten years 1,183,893 1,040,925 2.66 % Beyond ten years 1,668,160 1,425,930 2.72 % Total $ 3,013,493 $ 2,601,188 2.69 % The following table summarizes the available-for-sale investment securities with unrealized losses for which an allowance for credit losses has not been recorded by aggregated major security type and length of time in a continuous unrealized loss position: Less than 12 months 12 months or longer Total (dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Losses December 31, 2023 Available-for-Sale U.S. Treasury $ 8,937 $ (42) $ 191,027 $ (11,899) $ 199,964 $ (11,941) U.S. government-sponsored entities — — 1,189,314 (192,717) 1,189,314 (192,717) Mortgage-backed securities - Agency 90,145 (710) 3,835,552 (621,142) 3,925,697 (621,852) States and political subdivisions 86,865 (495) 259,767 (22,562) 346,632 (23,057) Pooled trust preferred securities — — 11,337 (2,460) 11,337 (2,460) Other securities 39,032 (229) 255,888 (21,887) 294,920 (22,116) Total available-for-sale $ 224,979 $ (1,476) $ 5,742,885 $ (872,667) $ 5,967,864 $ (874,143) December 31, 2022 Available-for-Sale U.S. Treasury $ 130,967 $ (3,264) $ 66,992 $ (1,925) $ 197,959 $ (5,189) U.S. government-sponsored entities 454,854 (75,795) 720,226 (93,453) 1,175,080 (169,248) Mortgage-backed securities - Agency 3,207,319 (358,507) 1,116,205 (258,921) 4,323,524 (617,428) States and political subdivisions 414,813 (25,555) 2,703 (541) 417,516 (26,096) Pooled trust preferred securities — — 10,811 (2,972) 10,811 (2,972) Other securities 257,775 (17,045) 75,309 (9,496) 333,084 (26,541) Total available-for-sale $ 4,465,728 $ (480,166) $ 1,992,246 $ (367,308) $ 6,457,974 $ (847,474) The following table summarizes the held-to-maturity investment securities with unrecognized losses aggregated by major security type and length of time in a continuous loss position: Less than 12 months 12 months or longer Total (dollars in thousands) Fair Unrecognized Fair Unrecognized Fair Unrecognized December 31, 2023 Held-to-Maturity U.S. government-sponsored entities $ — $ — $ 671,126 $ (154,827) $ 671,126 $ (154,827) Mortgage-backed securities - Agency — — 881,994 (147,137) 881,994 (147,137) States and political subdivisions — — 977,154 (112,141) 977,154 (112,141) Total held-to-maturity $ — $ — $ 2,530,274 $ (414,105) $ 2,530,274 $ (414,105) December 31, 2022 Held-to-Maturity U.S. government-sponsored entities $ 354,293 $ (110,523) $ 302,066 $ (52,287) $ 656,359 $ (162,810) Mortgage-backed securities - Agency 367,849 (42,438) 615,114 (81,416) 982,963 (123,854) States and political subdivisions 838,689 (127,355) 135,573 (31,667) 974,262 (159,022) Total held-to-maturity $ 1,560,831 $ (280,316) $ 1,052,753 $ (165,370) $ 2,613,584 $ (445,686) The unrecognized losses on held-to-maturity investment securities presented in the table above do not include unrecognized losses on securities that were transferred from available-for-sale to held-for-maturity totaling $127.6 million at December 31, 2023 and $148.9 million at December 31, 2022. These unrecognized losses are included as a separate component of shareholders’ equity and are being amortized over the remaining term of the securities. No allowance for credit losses for available-for-sale debt securities An allowance on held-to-maturity debt securities is maintained for certain municipal bonds to account for expected lifetime credit losses. Substantially all of the U.S. government-sponsored entities and agencies and agency mortgage-backed securities are either explicitly or implicitly guaranteed by the U.S. government, are highly rated by major credit rating agencies, and have a long history of no credit losses. Therefore, for those securities, we do not record expected credit losses. The allowance for credit losses on held-to-maturity debt securities was $0.2 million at December 31, 2023 and December 31, 2022. Accrued interest receivable on securities portfolio is excluded from the estimate of credit losses and totaled $50.3 million at December 31, 2023 and $50.9 million at December 31, 2022. At December 31, 2023, Old National’s securities portfolio consisted of 2,920 securities, 2,588 of which were in an unrealized loss position. The unrealized losses attributable to our U.S. Treasury, U.S. government-sponsored entities and agencies, agency mortgage-backed securities, states and political subdivisions, and other securities are the result of fluctuations in interest rates and market movements. Old National’s pooled trust preferred securities are evaluated using collateral-specific assumptions to estimate the expected future interest and principal cash flows. At December 31, 2023, we had no intent to sell any securities that were in an unrealized loss position nor is it expected that we would be required to sell the securities prior to their anticipated recovery. Old National’s pooled trust preferred securities have experienced credit defaults. However, we believe that the value of the instruments lies in the full and timely interest payments that will be received through maturity, the steady amortization that will be experienced until maturity, and the full return of principal by the final maturity of the collateralized debt obligations. Old National did not recognize any losses on these securities for the years ended December 31, 2023 or December 31, 2022. Equity Securities Equity securities consist of mutual funds for Community Reinvestment Act qualified investments and diversified investment securities held in a grantor trust for participants in the Company’s nonqualified deferred compensation plan. Old National’s equity securities with readily determinable fair values totaled $80.4 million at December 31, 2023 and $52.5 million at December 31, 2022. There were gains on equity securities of $21.5 million during 2023, losses on equity securities of $4.9 million during 2022, and gains on equity securities of $0.2 million during 2021. Alternative Investments Old National has alternative investments without readily determinable fair values that are included in other assets totaling $449.3 million at December 31, 2023, consisting of $252.2 million of illiquid investments of partnerships, limited liability companies, and other ownership interests that support affordable housing and $197.1 million of economic development and community revitalization initiatives in low-to-moderate income neighborhoods. These alternative investments totaled $396.8 million at December 31, 2022. There were no impairments or adjustments on equity securities without readily determinable fair values, except for amortization of tax credit investments during 2023, 2022, and 2021.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Loans and Allowance for Credit Losses	LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans Old National’s loans consist primarily of loans made to consumers and commercial clients in many diverse industries, including real estate rental and leasing, manufacturing, healthcare, wholesale trade, construction, and agriculture, among others. Most of Old National’s lending activity occurs within our principal geographic markets in the Midwest region. Old National manages concentrations of credit exposure by industry, product, geography, client relationship, and loan size. In the ordinary course of business, Old National grants loans to certain executive officers and directors (collectively referred to as “related parties”). The aggregate amount of loans to related parties was not greater than 5% of the Company’s shareholders’ equity at December 31, 2023 or 2022. Old National has loan participations, which qualify as participating interests, with other financial institutions. At December 31, 2023, these loans totaled $2.8 billion, of which $1.2 billion had been sold to other financial institutions and $1.6 billion was retained by Old National. The loan participations convey proportionate ownership rights with equal priority to each participating interest holder; involve no recourse (other than ordinary representations and warranties) to, or subordination by, any participating interest holder; all cash flows are divided among the participating interest holders in proportion to each holder’s share of ownership; and no holder has the right to pledge the entire financial asset unless all participating interest holders agree. The loan categories used to monitor and analyze interest income and yields are different than the portfolio segments used to determine the allowance for credit losses on loans. The allowance for credit losses was calculated by pooling loans of similar credit risk characteristics and credit monitoring procedures. The four loan portfolios used to monitor and analyze interest income and yields – commercial, commercial real estate, residential real estate, and consumer – are reclassified into seven segments of loans – commercial, commercial real estate, BBCC, residential real estate, indirect, direct, and home equity for purposes of determining the allowance for credit losses on loans. The commercial and commercial real estate loan categories shown on the balance sheet include the same pool of loans as the commercial, commercial real estate, and BBCC portfolio segments. The consumer loan category shown on the balance sheet is comprised of the same loans in the indirect, direct, and home equity portfolio segments. The portfolio segment reclassifications follow: Balance Sheet Portfolio Portfolio (dollars in thousands) December 31, 2023 Commercial (1) $ 9,512,230 $ (232,764) $ 9,279,466 Commercial real estate 14,140,629 (169,058) 13,971,571 BBCC N/A 401,822 401,822 Residential real estate 6,699,443 — 6,699,443 Consumer 2,639,625 (2,639,625) N/A Indirect N/A 1,050,982 1,050,982 Direct N/A 523,172 523,172 Home equity N/A 1,065,471 1,065,471 Total loans (2) 32,991,927 — 32,991,927 Allowance for credit losses on loans (307,610) — (307,610) Net loans $ 32,684,317 $ — $ 32,684,317 December 31, 2022 Commercial (1) $ 9,508,904 $ (210,280) $ 9,298,624 Commercial real estate 12,457,070 (158,322) 12,298,748 BBCC N/A 368,602 368,602 Residential real estate 6,460,441 — 6,460,441 Consumer 2,697,226 (2,697,226) N/A Indirect N/A 1,034,257 1,034,257 Direct N/A 629,186 629,186 Home equity N/A 1,033,783 1,033,783 Total loans (2) 31,123,641 — 31,123,641 Allowance for credit losses on loans (303,671) — (303,671) Net loans $ 30,819,970 $ — $ 30,819,970 (1) Includes direct finance leases of $169.7 million at December 31, 2023 and $188.1 million at December 31, 2022. (2) Includes unearned income of $93.7 million at December 31, 2023 and $126.7 million at December 31, 2022. The risk characteristics of each loan portfolio segment are as follows: Commercial Commercial loans are classified primarily on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected and the collateral securing these loans may fluctuate in value. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some loans may be made on an unsecured basis. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its clients. Commercial Real Estate Commercial real estate loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves higher loan principal amounts, and the repayment of these loans is generally dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan. Commercial real estate loans may be adversely affected by conditions in the real estate markets or in the general economy. The properties securing Old National’s commercial real estate portfolio are diverse in terms of type and geographic location. Management monitors and evaluates commercial real estate loans based on collateral, geography, and risk grade criteria. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner-occupied loans. Included with commercial real estate are construction loans, which are underwritten utilizing independent appraisal reviews, sensitivity analysis of absorption and lease rates, financial analysis of the developers and property owners, and feasibility studies, if available. Construction loans are generally based on estimates of costs and value associated with the complete project. These estimates may be inaccurate. Construction loans often involve the disbursement of substantial funds with repayment substantially dependent on the success of the ultimate project. Sources of repayment for these types of loans may be pre-committed permanent loans from approved long-term lenders (including Old National), sales of developed property, or an interim loan commitment from Old National until permanent financing is obtained. These loans are closely monitored by on-site inspections and are considered to have higher risks than other real estate loans due to their ultimate repayment being sensitive to interest rate changes, governmental regulation of real property, general economic conditions, and the availability of long-term financing. At 244%, Old National Bank’s applicable investor commercial real estate loans as a percentage of its risk-based capital remained below the regulatory guideline limit of 300% at December 31, 2023. BBCC BBCC loans are typically granted to small businesses with gross revenues of less than $5 million and aggregate debt of less than $1 million. Old National has established minimum debt service coverage ratios, minimum FICO scores for owners and guarantors, and the ability to show relatively stable earnings as criteria to help mitigate risk. Repayment of these loans depends on the personal income of the borrowers and the cash flows of the business. These factors can be affected by factors such as changes in economic conditions and unemployment levels. Residential With respect to residential loans that are secured by 1 - 4 family residences and are generally owner occupied, Old National typically establishes a maximum loan-to-value ratio and generally requires private mortgage insurance if that ratio is exceeded. Repayment of these loans is primarily dependent on the personal income of the borrowers, which can be impacted by economic conditions in their market areas such as unemployment levels. Repayment can also be impacted by changes in residential property values. Portfolio risk is mitigated by the fact that the loans are of smaller individual amounts and spread over a large number of borrowers. Indirect Indirect loans are secured by automobile collateral, generally new and used cars and trucks from auto dealers that operate within our footprint. Old National typically mitigates the risk of indirect loans by establishing minimum FICO scores, maximum loan-to-value ratios, and maximum debt-to-income ratios. Repayment of these loans depends largely on the personal income of the borrowers, which can be affected by changes in economic conditions such as unemployment levels. Portfolio risk is mitigated by the fact that the loans are of smaller amounts spread over many borrowers and ongoing reviews of dealer relationships. Direct Direct loans are typically secured by collateral such as auto or real estate or are unsecured. Old National has established underwriting standards such as minimum FICO scores, maximum loan-to-value ratios, and maximum debt-to-income ratios. Repayment of these loans depends largely on the personal income of the borrowers, which can be affected by changes in economic conditions such as unemployment levels. Portfolio risk is mitigated by the fact that the loans are of smaller amounts spread over many borrowers. Home Equity Home equity loans are generally secured by 1-4 family residences that are owner-occupied. Old National has established underwriting standards such as minimum FICO scores, maximum loan-to-value ratios, and maximum debt-to-income ratios. Repayment of these loans depends largely on the personal income of the borrowers, which can be affected by changes in economic conditions such as unemployment levels. Portfolio risk is mitigated by the fact that the loans are of smaller amounts spread over many borrowers, along with monitoring of updated borrower credit scores. Allowance for Credit Losses Loans Credit loss assumptions used when computing the level of expected credit losses are estimated using a model that categorizes loan pools based on loss history, delinquency status, and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. The base forecast scenario considers unemployment, gross domestic product, and the BBB ratio (BBB spread to the 10-year U.S. Treasury rate). In addition to the quantitative inputs, several qualitative factors are considered. These factors include the risk that unemployment, gross domestic product, housing product index, and the BBB ratio prove to be more severe and/or prolonged than our baseline forecast due to a variety of factors including monetary actions to control inflation, recent instability in the banking sector, global military conflicts, and global supply chain issues. Old National’s activity in the allowance for credit losses on loans by portfolio segment was as follows: (dollars in thousands) Balance at Allowance Charge-offs Recoveries Provision Balance at Year Ended December 31, 2023 Commercial $ 120,612 $ — $ (41,451) $ 4,172 $ 35,000 $ 118,333 Commercial real estate 138,244 — (11,198) 2,417 25,636 155,099 BBCC 2,431 — (1,650) 275 1,831 2,887 Residential real estate 21,916 — (256) 1,268 (2,091) 20,837 Indirect 1,532 — (2,948) 1,559 1,093 1,236 Direct 12,116 — (10,517) 2,331 (761) 3,169 Home equity 6,820 — (443) 531 (859) 6,049 Total $ 303,671 $ — $ (68,463) $ 12,553 $ 59,849 $ 307,610 Year Ended December 31, 2022 Commercial $ 27,232 $ 38,780 $ (6,885) $ 4,610 $ 56,875 $ 120,612 Commercial real estate 64,004 49,419 (6,519) 1,095 30,245 138,244 BBCC 2,458 — (85) 281 (223) 2,431 Residential real estate 9,347 136 (344) 760 12,017 21,916 Indirect 1,743 — (2,525) 1,263 1,051 1,532 Direct 528 31 (10,799) 2,557 19,799 12,116 Home equity 2,029 723 (124) 616 3,576 6,820 Total $ 107,341 $ 89,089 $ (27,281) $ 11,182 $ 123,340 $ 303,671 Year Ended December 31, 2021 Commercial $ 30,567 $ — $ (1,228) $ 791 $ (2,898) $ 27,232 Commercial real estate 75,810 — (264) 4,403 (15,945) 64,004 BBCC 6,120 — (144) 105 (3,623) 2,458 Residential real estate 12,608 — (346) 339 (3,254) 9,347 Indirect 3,580 — (1,087) 1,682 (2,432) 1,743 Direct 855 — (1,159) 777 55 528 Home equity 1,848 — (82) 978 (715) 2,029 Total $ 131,388 $ — $ (4,310) $ 9,075 $ (28,812) $ 107,341 Accrued interest receivable on loans is excluded from the estimate of credit losses and totaled $169.8 million at December 31, 2023 and $137.7 million at December 31, 2022. Unfunded Loan Commitments Old National maintains an allowance for credit losses on unfunded loan commitments to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for credit losses on loans, modified to take into account the probability of a drawdown on the commitment. The allowance for credit losses on unfunded loan commitments is classified as a liability account on the balance sheet within accrued expenses and other liabilities, while the corresponding provision for unfunded loan commitments is included in the provision for credit losses. Old National’s activity in the allowance for credit losses on unfunded loan commitments was as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 32,188 $ 10,879 $ 11,689 Provision for credit losses on unfunded loan commitments — 11,013 — Provision (release) for credit losses on unfunded loan (962) 10,296 (810) Balance at end of period $ 31,226 $ 32,188 $ 10,879 Credit Quality Old National’s management monitors the credit quality of its loans on an ongoing basis with the AQR for commercial loans reviewed annually or at renewal and the performance of its residential and consumer loans based upon the accrual status refreshed at least quarterly. Internally, management assigns an AQR to each non-homogeneous commercial, commercial real estate, and BBCC loan in the portfolio. The primary determinants of the AQR are the reliability of the primary source of repayment and the past, present, and projected financial condition of the borrower. The AQR will also consider current industry conditions. Major factors used in determining the AQR can vary based on the nature of the loan, but commonly include factors such as debt service coverage, internal cash flow, liquidity, leverage, operating performance, debt burden, FICO scores, occupancy, interest rate sensitivity, and expense burden. Old National uses the following definitions for risk ratings: Criticized . Special mention loans that have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. Classified – Substandard . Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Classified – Nonaccrual . Loans classified as nonaccrual have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection in full, on the basis of currently existing facts, conditions, and values, in doubt. Classified – Doubtful . Loans classified as doubtful have all the weaknesses inherent in those classified as nonaccrual, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Pass rated loans are those loans that are other than criticized, classified – substandard, classified – nonaccrual, or classified – doubtful. The following table summarizes the amortized cost of term loans by risk category of commercial, commercial real estate, and BBCC loans by loan portfolio segment, class of loan, and origination year: Origination Year Revolving to Term (dollars in 2023 2022 2021 2020 2019 Prior Revolving Total December 31, 2023 Commercial: Risk Rating: Pass $ 1,826,289 $ 1,573,669 $ 985,964 $ 520,883 $ 450,911 $ 495,979 $ 2,051,985 $ 651,953 $ 8,557,633 Criticized 20,038 90,031 19,953 36,906 25,756 47,357 89,765 44,348 374,154 Classified: Substandard 27,271 41,164 27,990 37,618 10,461 29,981 72,703 56,716 303,904 Nonaccrual 32 7,034 — — 823 3,411 — 5,461 16,761 Doubtful — 7,261 5,925 4,875 1,742 7,211 — — 27,014 Total $ 1,873,630 $ 1,719,159 $ 1,039,832 $ 600,282 $ 489,693 $ 583,939 $ 2,214,453 $ 758,478 $ 9,279,466 Commercial real estate: Risk Rating: Pass $ 2,177,841 $ 3,515,702 $ 2,563,638 $ 1,576,044 $ 1,010,351 $ 1,161,119 $ 103,332 $ 960,386 $ 13,068,413 Criticized 69,648 69,946 68,708 27,059 52,107 95,896 3,893 64,730 451,987 Classified: Substandard 26,638 56,423 21,401 28,983 61,186 49,558 — 48,760 292,949 Nonaccrual — 21,919 10,706 1,975 1,634 8,632 — 1,400 46,266 Doubtful 5,360 429 30,897 2,306 37,777 35,187 — — 111,956 Total $ 2,279,487 $ 3,664,419 $ 2,695,350 $ 1,636,367 $ 1,163,055 $ 1,350,392 $ 107,225 $ 1,075,276 $ 13,971,571 BBCC: Risk Rating: Pass $ 81,102 $ 64,583 $ 44,307 $ 38,086 $ 27,557 $ 19,028 $ 68,807 $ 33,361 $ 376,831 Criticized — — 857 700 1,001 349 2,144 12,728 17,779 Classified: Substandard 436 193 252 — — 604 15 1,006 2,506 Nonaccrual — — 482 — 4 1,105 — 1,402 2,993 Doubtful 302 727 254 286 60 84 — — 1,713 Total $ 81,840 $ 65,503 $ 46,152 $ 39,072 $ 28,622 $ 21,170 $ 70,966 $ 48,497 $ 401,822 Origination Year Revolving to Term (dollars in thousands) 2022 2021 2020 2019 2018 Prior Revolving Total December 31, 2022 Commercial: Risk Rating: Pass $ 2,388,618 $ 1,754,364 $ 796,340 $ 738,208 $ 362,986 $ 388,617 $ 1,988,763 $ 329,119 $ 8,747,015 Criticized 40,856 30,661 63,557 33,490 9,195 5,312 61,036 4,327 248,434 Classified: Substandard 37,223 47,522 16,540 22,925 4,844 21,204 67,402 25,143 242,803 Nonaccrual 3,627 1,453 566 — — — 1,634 6,623 13,903 Doubtful 2,821 17,604 3,720 8,005 5,968 8,351 — — 46,469 Total $ 2,473,145 $ 1,851,604 $ 880,723 $ 802,628 $ 382,993 $ 423,484 $ 2,118,835 $ 365,212 $ 9,298,624 Commercial real estate: Risk Rating: Pass $ 3,066,960 $ 2,828,758 $ 1,989,000 $ 1,219,025 $ 675,572 $ 1,018,719 $ 57,818 $ 689,553 $ 11,545,405 Criticized 75,306 34,422 22,569 82,637 86,504 56,864 — 23,282 381,584 Classified: Substandard 46,231 16,928 24,319 78,468 57,824 21,591 — 4,108 249,469 Nonaccrual 3,151 9,541 5,014 — 2,312 22,155 — 3,257 45,430 Doubtful 1,934 38,386 10,011 4,605 1,523 20,401 — — 76,860 Total $ 3,193,582 $ 2,928,035 $ 2,050,913 $ 1,384,735 $ 823,735 $ 1,139,730 $ 57,818 $ 720,200 $ 12,298,748 BBCC: Risk Rating: Pass $ 90,341 $ 64,161 $ 52,304 $ 36,868 $ 23,618 $ 11,333 $ 60,016 $ 18,881 $ 357,522 Criticized 1,504 525 368 692 353 — 1,006 1,603 6,051 Classified: Substandard 811 143 — 421 — — 543 682 2,600 Nonaccrual 42 37 118 — 429 284 — 639 1,549 Doubtful 40 107 439 157 64 73 — — 880 Total $ 92,738 $ 64,973 $ 53,229 $ 38,138 $ 24,464 $ 11,690 $ 61,565 $ 21,805 $ 368,602 For residential real estate and consumer loan classes, Old National evaluates credit quality based on the aging status of the loan and by payment activity. The performing or nonperforming status is updated on an on-going basis dependent upon improvement and deterioration in credit quality. The following table presents the amortized cost of term residential real estate and consumer loans based on payment activity and origination year: Origination Year Revolving to Term (dollars in thousands) 2023 2022 2021 2020 2019 Prior Revolving Total December 31, 2023 Residential real estate: Performing $ 453,743 $ 1,508,671 $ 1,836,078 $ 1,705,131 $ 430,783 $ 722,987 $ — $ 279 $ 6,657,672 Nonperforming 116 4,563 4,004 3,375 4,078 25,635 — — 41,771 Total $ 453,859 $ 1,513,234 $ 1,840,082 $ 1,708,506 $ 434,861 $ 748,622 $ — $ 279 $ 6,699,443 Indirect: Performing $ 393,369 $ 355,822 $ 162,735 $ 82,871 $ 37,967 $ 13,815 $ — $ 196 $ 1,046,775 Nonperforming 372 1,472 1,207 547 318 291 — — 4,207 Total $ 393,741 $ 357,294 $ 163,942 $ 83,418 $ 38,285 $ 14,106 $ — $ 196 $ 1,050,982 Direct: Performing $ 109,372 $ 90,310 $ 92,491 $ 48,387 $ 29,659 $ 67,129 $ 75,080 $ 4,852 $ 517,280 Nonperforming 67 531 517 560 210 3,872 124 11 5,892 Total $ 109,439 $ 90,841 $ 93,008 $ 48,947 $ 29,869 $ 71,001 $ 75,204 $ 4,863 $ 523,172 Home equity: Performing $ 290 $ 164 $ 160 $ 140 $ 679 $ 4,483 $ 1,019,389 $ 23,918 $ 1,049,223 Nonperforming — 310 328 404 741 4,327 2,844 7,294 16,248 Total $ 290 $ 474 $ 488 $ 544 $ 1,420 $ 8,810 $ 1,022,233 $ 31,212 $ 1,065,471 Origination Year Revolving to Term 2022 2021 2020 2019 2018 Prior Revolving Total December 31, 2022 Residential real estate: Performing $ 1,327,168 $ 1,945,792 $ 1,825,762 $ 478,529 $ 136,260 $ 712,175 $ 7 $ 88 $ 6,425,781 Nonperforming 59 529 861 873 1,826 30,512 — — 34,660 Total $ 1,327,227 $ 1,946,321 $ 1,826,623 $ 479,402 $ 138,086 $ 742,687 $ 7 $ 88 $ 6,460,441 Indirect: Performing $ 504,410 $ 249,407 $ 144,265 $ 82,304 $ 31,484 $ 19,095 $ — $ 62 $ 1,031,027 Nonperforming 348 1,074 645 531 304 328 — — 3,230 Total $ 504,758 $ 250,481 $ 144,910 $ 82,835 $ 31,788 $ 19,423 $ — $ 62 $ 1,034,257 Direct: Performing $ 132,934 $ 164,126 $ 77,406 $ 57,919 $ 45,299 $ 59,212 $ 87,622 $ 671 $ 625,189 Nonperforming 115 851 614 205 327 1,526 5 354 3,997 Total $ 133,049 $ 164,977 $ 78,020 $ 58,124 $ 45,626 $ 60,738 $ 87,627 $ 1,025 $ 629,186 Home equity: Performing $ 919 $ 896 $ 1,849 $ 1,497 $ 983 $ 11,646 $ 990,001 $ 14,792 $ 1,022,583 Nonperforming 166 160 166 446 794 4,308 1,698 3,462 11,200 Total $ 1,085 $ 1,056 $ 2,015 $ 1,943 $ 1,777 $ 15,954 $ 991,699 $ 18,254 $ 1,033,783 The following table summarizes the gross charge-offs of loans by loan portfolio segment and origination year: Origination Year (dollars in thousands) 2023 2022 2021 2020 2019 Prior Revolving Total Year Ended December 31, 2023 Commercial $ — $ 6,475 $ 24,022 $ 120 $ 7,245 $ 2,880 $ 709 $ 41,451 Commercial real estate — 54 2,808 2,144 — 6,192 — 11,198 BBCC 670 548 362 70 — — — 1,650 Residential real estate — — — — — 256 — 256 Indirect 271 1,447 787 159 152 132 — 2,948 Direct 173 1,899 2,367 746 1,207 543 3,582 10,517 Home equity — — — 35 — 408 — 443 Total gross charge-offs $ 1,114 $ 10,423 $ 30,346 $ 3,274 $ 8,604 $ 10,411 $ 4,291 $ 68,463 Nonaccrual and Past Due Loans Old National does not record interest on nonaccrual loans until principal is recovered. For all loan classes, a loan is generally placed on nonaccrual status when principal or interest becomes 90 days past due unless it is well secured and in the process of collection, or earlier when concern exists as to the ultimate collectability of principal or interest. Interest accrued but not received is reversed against earnings. Cash interest received on these loans is applied to the principal balance until the principal is recovered or until the loan returns to accrual status. Loans may be returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for a prescribed period, and future payments are reasonably assured. The following table presents the aging of the amortized cost basis in past due loans by class of loans: (dollars in thousands) 30-59 Days 60-89 Days Past Due Total Current Total December 31, 2023 Commercial $ 16,128 $ 1,332 $ 4,861 $ 22,321 $ 9,257,145 $ 9,279,466 Commercial real estate 9,081 5,254 30,660 44,995 13,926,576 13,971,571 BBCC 1,368 134 977 2,479 399,343 401,822 Residential 12,358 367 15,249 27,974 6,671,469 6,699,443 Indirect 7,025 1,854 1,342 10,221 1,040,761 1,050,982 Direct 5,436 1,455 1,787 8,678 514,494 523,172 Home equity 7,791 2,347 6,659 16,797 1,048,674 1,065,471 Total $ 59,187 $ 12,743 $ 61,535 $ 133,465 $ 32,858,462 $ 32,991,927 December 31, 2022 Commercial $ 14,147 $ 4,801 $ 11,080 $ 30,028 $ 9,268,596 $ 9,298,624 Commercial real estate 47,240 1,312 32,892 81,444 12,217,304 12,298,748 BBCC 730 365 603 1,698 366,904 368,602 Residential 24,181 5,033 11,753 40,967 6,419,474 6,460,441 Indirect 6,302 2,118 958 9,378 1,024,879 1,034,257 Direct 5,404 2,118 1,928 9,450 619,736 629,186 Home equity 6,585 1,966 4,707 13,258 1,020,525 1,033,783 Total $ 104,589 $ 17,713 $ 63,921 $ 186,223 $ 30,937,418 $ 31,123,641 The following table presents the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: December 31, 2023 December 31, 2022 (dollars in thousands) Nonaccrual Nonaccrual Past Due Nonaccrual Nonaccrual Past Due Commercial $ 43,775 $ 13,143 $ 242 $ 60,372 $ 7,873 $ 152 Commercial real estate 158,222 24,507 585 122,290 33,445 — BBCC 4,706 — 95 2,429 — — Residential 41,771 — — 34,660 — 1,808 Indirect 4,207 — 8 3,230 — 28 Direct 5,892 — 31 3,997 — 133 Home equity 16,248 — — 11,200 — 529 Total $ 274,821 $ 37,650 $ 961 $ 238,178 $ 41,318 $ 2,650 Interest income recognized on nonaccrual loans was insignificant during the years ended December 31, 2023 and 2022. When management determines that foreclosure is probable, expected credit losses for collateral dependent loans are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. A loan is considered collateral dependent when the borrower is experiencing financial difficulty, and the loan is expected to be repaid substantially through the operation or sale of the collateral. The class of loan represents the primary collateral type associated with the loan. Significant quarter-over-quarter changes are reflective of changes in nonaccrual status and not necessarily associated with credit quality indicators like appraisal value. The following table presents the amortized cost basis of collateral dependent loans by class of loan: Type of Collateral (dollars in thousands) Real Blanket Investment Auto Other December 31, 2023 Commercial $ 14,303 $ 24,729 $ 2,577 $ 280 $ 328 Commercial Real Estate 146,425 — 1,167 — 6,107 BBCC 3,522 794 — 390 — Residential 41,771 — — — — Indirect — — — 4,207 — Direct 4,727 1 3 366 29 Home equity 16,248 — — — — Total $ 226,996 $ 25,524 $ 3,747 $ 5,243 $ 6,464 December 31, 2022 Commercial $ 8,962 $ 42,754 $ 2,690 $ 1,611 $ 980 Commercial Real Estate 108,871 — 1,718 — 6,411 BBCC 1,939 478 — 12 — Residential 34,660 — — — — Indirect — — — 3,230 — Direct 2,991 13 — 232 23 Home equity 11,200 — — — — Total $ 168,623 $ 43,245 $ 4,408 $ 5,085 $ 7,414 Financial Difficulty Modifications Occasionally, Old National modifies loans to borrowers experiencing financial difficulty in the form of principal forgiveness, term extension, an other-than-insignificant payment delay, or interest rate reduction (or a combination thereof). When principal forgiveness is provided, the amount of forgiveness is charged-off against the allowance for credit losses on loans. The following table presents the amortized cost basis of financial difficulty modifications at December 31, 2023 that were modified during the year ended December 31, 2023 by class of loans and type of modification: (dollars in thousands) Term Total Year Ended December 31, 2023 Commercial $ 21,631 0.2 % Commercial real estate 121,529 0.9 % Total $ 143,160 0.4 % Old National monitors the performance of financial difficulty modifications to understand the effectiveness of its efforts. The following table presents the performance of loans identified as financial difficulty modifications at December 31, 2023: (dollars in thousands) 30-59 Days 60-89 Days Past Due Total Current Total December 31, 2023 Commercial $ — $ — $ — $ — $ 21,631 $ 21,631 Commercial real estate 5,287 — — 5,287 116,242 121,529 Total $ 5,287 $ — $ — $ 5,287 $ 137,873 $ 143,160 The following table summarizes the nature of the financial difficulty modifications during the year ended December 31, 2023 by class of loans: (dollars in thousands) Weighted- Year Ended December 31, 2023 Commercial 6.1 Commercial real estate 8.6 Total 8.2 There were no material payment defaults on these loans subsequent to their modifications during the year ended December 31, 2023. At December 31, 2023, Old National had not committed to lend any material additional funds to the borrowers whose loans were modified due to financial difficulties.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Premises and Equipment	PREMISES AND EQUIPMENT The composition of premises and equipment was as follows: December 31, (dollars in thousands) 2023 2022 Land $ 91,568 $ 91,568 Buildings 453,234 419,596 Furniture, fixtures, and equipment 148,134 154,719 Leasehold improvements 85,187 69,412 Total 778,123 735,295 Accumulated depreciation (212,727) (177,988) Premises and equipment, net $ 565,396 $ 557,307 Depreciation expense was $38.2 million in 2023, $36.4 million in 2022, and $27.3 million in 2021. Finance Leases Old National leases certain banking center buildings and equipment under finance leases that are included in premises and equipment. See Notes 6 and 13 to the consolidated financial statements for detail regarding these leases.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Lessee Disclosure [Abstract]
Leases	LEASES Old National determines if an arrangement is or contains a lease at contract inception. Operating leases are included in other assets and other liabilities in our consolidated balance sheets. Finance leases are included in premises and equipment and other borrowings in our consolidated balance sheets. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, we use the implicit lease rate when readily determinable. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date. The incremental borrowing rate is the rate of interest that we would have to pay to borrow on a collateralized basis over a similar term in an amount equal to the lease payments in a similar economic environment. Old National has operating and finance leases for land, office space, banking centers, and equipment. These leases are generally for periods of 5 to 20 years with various renewal options. We include certain renewal options in the measurement of our right-of-use assets and lease liabilities if they are reasonably certain to be exercised. Variable lease payments that are dependent on an index or a rate are initially measured using the index or rate at the commencement date and are included in the measurement of the lease liability. Variable lease payments that are not dependent on an index or a rate are excluded from the measurement of the lease liability and are recognized in profit and loss when incurred. Variable lease payments are defined as payments made for the right to use an asset that vary because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. Old National has lease agreements with lease and non-lease components, which are generally accounted for separately. For real estate leases, non-lease components and other non-components, such as common area maintenance charges, real estate taxes, and insurance are not included in the measurement of the lease liability since they are generally able to be segregated. For certain equipment leases, Old National accounts for the lease and non-lease components as a single lease component using the practical expedient available for that class of assets. Old National does not have any material sub-lease agreements. The components of lease expense were as follows: Affected Line Years Ended December 31, (dollars in thousands) 2023 2022 2021 Operating lease cost Occupancy/Equipment expense $ 31,175 $ 29,368 $ 12,336 Finance lease cost: Amortization of right-of-use assets Occupancy expense 2,921 2,672 2,356 Interest on lease liabilities Interest expense 722 415 431 Sub-lease income Occupancy expense (387) (448) (438) Total $ 34,431 $ 32,007 $ 14,685 Supplemental balance sheet information related to leases was as follows: December 31, (dollars in thousands) 2023 2022 Operating Leases Operating lease right-of-use assets $ 185,506 $ 189,714 Operating lease liabilities 204,960 211,964 Finance Leases Premises and equipment, net 19,820 10,799 Other borrowings 20,955 13,469 Weighted-Average Remaining Lease Term (in Years) Operating leases 8.5 9.1 Finance leases 10.5 7.2 Weighted-Average Discount Rate Operating leases 3.04 % 2.88 % Finance leases 3.90 % 3.30 % Supplemental cash flow information related to leases was as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 31,720 $ 30,340 $ 13,823 Operating cash flows from finance leases 722 415 431 Financing cash flows from finance leases 2,533 2,475 2,057 The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2023: (dollars in thousands) Operating Finance 2024 $ 31,199 $ 3,357 2025 30,703 3,380 2026 29,972 2,154 2027 29,038 2,158 2028 25,392 2,056 Thereafter 87,940 12,752 Total undiscounted lease payments 234,244 25,857 Amounts representing interest (29,284) (4,902) Lease liability $ 204,960 $ 20,955
Leases	LEASES Old National determines if an arrangement is or contains a lease at contract inception. Operating leases are included in other assets and other liabilities in our consolidated balance sheets. Finance leases are included in premises and equipment and other borrowings in our consolidated balance sheets. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, we use the implicit lease rate when readily determinable. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date. The incremental borrowing rate is the rate of interest that we would have to pay to borrow on a collateralized basis over a similar term in an amount equal to the lease payments in a similar economic environment. Old National has operating and finance leases for land, office space, banking centers, and equipment. These leases are generally for periods of 5 to 20 years with various renewal options. We include certain renewal options in the measurement of our right-of-use assets and lease liabilities if they are reasonably certain to be exercised. Variable lease payments that are dependent on an index or a rate are initially measured using the index or rate at the commencement date and are included in the measurement of the lease liability. Variable lease payments that are not dependent on an index or a rate are excluded from the measurement of the lease liability and are recognized in profit and loss when incurred. Variable lease payments are defined as payments made for the right to use an asset that vary because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. Old National has lease agreements with lease and non-lease components, which are generally accounted for separately. For real estate leases, non-lease components and other non-components, such as common area maintenance charges, real estate taxes, and insurance are not included in the measurement of the lease liability since they are generally able to be segregated. For certain equipment leases, Old National accounts for the lease and non-lease components as a single lease component using the practical expedient available for that class of assets. Old National does not have any material sub-lease agreements. The components of lease expense were as follows: Affected Line Years Ended December 31, (dollars in thousands) 2023 2022 2021 Operating lease cost Occupancy/Equipment expense $ 31,175 $ 29,368 $ 12,336 Finance lease cost: Amortization of right-of-use assets Occupancy expense 2,921 2,672 2,356 Interest on lease liabilities Interest expense 722 415 431 Sub-lease income Occupancy expense (387) (448) (438) Total $ 34,431 $ 32,007 $ 14,685 Supplemental balance sheet information related to leases was as follows: December 31, (dollars in thousands) 2023 2022 Operating Leases Operating lease right-of-use assets $ 185,506 $ 189,714 Operating lease liabilities 204,960 211,964 Finance Leases Premises and equipment, net 19,820 10,799 Other borrowings 20,955 13,469 Weighted-Average Remaining Lease Term (in Years) Operating leases 8.5 9.1 Finance leases 10.5 7.2 Weighted-Average Discount Rate Operating leases 3.04 % 2.88 % Finance leases 3.90 % 3.30 % Supplemental cash flow information related to leases was as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 31,720 $ 30,340 $ 13,823 Operating cash flows from finance leases 722 415 431 Financing cash flows from finance leases 2,533 2,475 2,057 The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2023: (dollars in thousands) Operating Finance 2024 $ 31,199 $ 3,357 2025 30,703 3,380 2026 29,972 2,154 2027 29,038 2,158 2028 25,392 2,056 Thereafter 87,940 12,752 Total undiscounted lease payments 234,244 25,857 Amounts representing interest (29,284) (4,902) Lease liability $ 204,960 $ 20,955

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS The following table presents the changes in the carrying amount of goodwill: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 1,998,716 $ 1,036,994 $ 1,036,994 Acquisitions and adjustments — 961,722 — Balance at end of period $ 1,998,716 $ 1,998,716 $ 1,036,994 During 2022, Old National recorded $961.7 million of goodwill associated with the First Midwest merger. See Note 2 to the consolidated financial statements for additional detail regarding this transaction. Old National performed the required annual goodwill impairment test as of August 31, 2023 and there was no impairment. No events or circumstances since the August 31, 2023 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment exists. The gross carrying amounts and accumulated amortization of other intangible assets were as follows: (dollars in thousands) Gross Accumulated Net December 31, 2023 Core deposit $ 143,511 $ (72,940) $ 70,571 Customer trust relationships 52,621 (20,942) 31,679 Total intangible assets $ 196,132 $ (93,882) $ 102,250 December 31, 2022 Core deposit $ 170,642 $ (80,951) $ 89,691 Customer trust relationships 56,243 (19,529) 36,714 Total intangible assets $ 226,885 $ (100,480) $ 126,405 Other intangible assets consist of core deposit intangibles and customer relationship intangibles and are being amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of 5 to 15 years. During 2022, Old National recorded $77.9 million of core deposit intangibles and $39.7 million of customer trust relationships intangible associated with the First Midwest merger. Old National reviews other intangible assets for possible impairment whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. No impairment charges were recorded in 2023, 2022, or 2021. Total amortization expense associated with intangible assets was $24.2 million in 2023, $25.9 million in 2022, and $11.3 million in 2021. Estimated amortization expense for future years is as follows: (dollars in thousands) 2024 $ 21,239 2025 18,358 2026 15,555 2027 12,867 2028 10,356 Thereafter 23,875 Total $ 102,250

Loan Servicing Rights

Loan Servicing Rights	12 Months Ended
	Dec. 31, 2023
Transfers and Servicing [Abstract]
Loan Servicing Rights	LOAN SERVICING RIGHTS Loan servicing rights are included in other assets on the balance sheet. At December 31, 2023, loan servicing rights derived from mortgage loans sold with servicing retained totaled $35.8 million, compared to $37.3 million at December 31, 2022. Loans serviced for others are not reported as assets. The principal balance of mortgage loans serviced for others totaled $4.3 billion at both December 31, 2023 and December 31, 2022. Custodial escrow balances maintained in connection with serviced loans totaled $27.0 million at both December 31, 2023 and December 31, 2022. The following table summarizes the carrying values and activity related to loan servicing rights and the related valuation allowance: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 37,267 $ 30,085 $ 28,124 Additions (1) 3,657 13,080 11,759 Amortization (5,135) (5,898) (9,798) Balance before valuation allowance at end of period 35,789 37,267 30,085 Valuation allowance: Balance at beginning of period — (46) (1,407) (Additions)/recoveries — 46 1,361 Balance at end of period — — (46) Loan servicing rights, net $ 35,789 $ 37,267 $ 30,039 (1) Additions in 2022 included loan servicing rights of $7.7 million acquired in the First Midwest merger on February 15, 2022. At December 31, 2023, the fair value of servicing rights was $47.1 million, which was determined using a discount rate of 9% and a conditional prepayment rate of 10%. At December 31, 2022, the fair value of servicing rights was $48.4 million, which was determined using a discount rate of 9% and a conditional prepayment rate of 9%.

Qualified Affordable Housing Pr

Qualified Affordable Housing Projects and Other Tax Credit Investments	12 Months Ended
	Dec. 31, 2023
Investments in Affordable Housing Projects [Abstract]
Qualified Affordable Housing Projects and Other Tax Credit Investments	QUALIFIED AFFORDABLE HOUSING PROJECTS AND OTHER TAX CREDIT INVESTMENTS Old National is a limited partner in several tax-advantaged limited partnerships whose purpose is to invest in approved qualified affordable housing, renewable energy, or other renovation or community revitalization projects. These investments are included in other assets on the balance sheet, with any unfunded commitments included with other liabilities. As of December 31, 2023, Old National expects to recover its remaining investments through the use of the tax credits that are generated by the investments. The following table summarizes Old National’s investments in qualified affordable housing projects and other tax credit investments: (dollars in thousands) December 31, 2023 December 31, 2022 Investment Accounting Method Investment Unfunded Commitment (1) Investment Unfunded Commitment LIHTC Proportional amortization $ 114,991 $ 75,981 $ 84,428 $ 55,754 FHTC Equity 34,220 27,421 19,316 9,588 NMTC Consolidation 47,727 — 51,912 — Renewable Energy Equity 201 — 1,099 — Total $ 197,139 $ 103,402 $ 156,755 $ 65,342 (1) All commitments will be paid by Old National by December 31, 2027. The following table summarizes the amortization expense and tax benefit recognized for Old National’s qualified affordable housing projects and other tax credit investments: (dollars in thousands) Amortization Expense (1) Tax Expense (Benefit) Recognized (2) Year Ended December 31, 2023 LIHTC $ 9,343 $ (10,980) FHTC 5,487 (6,186) NMTC 8,982 (11,195) Renewable Energy 898 — Total $ 24,710 $ (28,361) Year Ended December 31, 2022 LIHTC $ 4,974 $ (6,613) FHTC 1,925 (2,227) NMTC 8,197 (10,225) Renewable Energy 839 — Total $ 15,935 $ (19,065) Year Ended December 31, 2021 LIHTC $ 3,450 $ (4,543) FHTC 2,557 (2,884) NMTC 2,887 (3,625) Renewable Energy 1,326 (562) Total $ 10,220 $ (11,614) (1) The amortization expense for the LIHTC investments is included in our income tax expense. The amortization expense for the FHTC, NMTC, and Renewable Energy tax credits is included in noninterest expense. (2) All of the tax benefits recognized are included in our income tax expense. The tax benefit recognized for the FHTC, NMTC, and Renewable Energy investments primarily reflects the tax credits generated from the investments and excludes the net tax expense (benefit) and deferred tax liability of the investments’ income (loss).

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
Deposits [Abstract]
Deposits	DEPOSITS At December 31, 2023, the scheduled maturities of total time deposits were as follows: (dollars in thousands) Due in 2024 $ 5,081,013 Due in 2025 376,189 Due in 2026 66,853 Due in 2027 33,864 Due in 2028 14,416 Thereafter 6,809 Total $ 5,579,144 The aggregate amount of time deposits in denominations that met or exceeded the FDIC insurance limit of $250,000 totaled $1.5 billion at December 31, 2023 and $793.4 million at December 31, 2022.

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2023
Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold Under Agreements to Repurchase	SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE Securities sold under agreements to repurchase are secured borrowings. Old National pledges investment securities to secure these borrowings. The following table presents securities sold under agreements to repurchase and related weighted-average interest rates for each of the years ended December 31: (dollars in thousands) 2023 2022 Outstanding at year-end $ 285,206 $ 432,804 Average amount outstanding 332,853 440,619 Maximum amount outstanding at any month-end 430,537 509,275 Weighted-average interest rate: During year 0.99 % 0.19 % End of year 3.64 1.31 The following table presents the contractual maturity of our secured borrowings and class of collateral pledged: At December 31, 2023 Remaining Contractual Maturity of the Agreements (dollars in thousands) Overnight and Up to 30-90 Days Greater Than Total Repurchase Agreements: U.S. Treasury and agency securities $ 285,206 $ — $ — $ — $ 285,206 Total $ 285,206 $ — $ — $ — $ 285,206 The fair value of securities pledged to secure repurchase agreements may decline. Old National has pledged securities valued at 115% of the gross outstanding balance of repurchase agreements at December 31, 2023 to manage this risk.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2023
Advance from Federal Home Loan Bank [Abstract]
Federal Home Loan Bank Advances	FEDERAL HOME LOAN BANK ADVANCES The following table summarizes Old National Bank’s FHLB advances: December 31, (dollars in thousands) 2023 2022 FHLB advances (fixed rates 2.19% to 5.51% and variable rates 5.34% to 5.36%) maturing January 2024 to December 2043 $ 4,300,528 $ 3,850,677 Fair value hedge basis adjustments and unamortized (19,847) (21,659) Total other borrowings $ 4,280,681 $ 3,829,018 FHLB advances had weighted-average rates of 3.45% at December 31, 2023 and 3.15% at December 31, 2022. FHLB advances are collateralized by designated assets that may include qualifying commercial real estate loans, residential and multifamily mortgages, home equity loans, and certain investment securities. At December 31, 2023, total unamortized prepayment fees related to all FHLB advance debt modifications completed in prior years totaled $14.2 million, compared to $20.2 million at December 31, 2022. Contractual maturities of FHLB advances at December 31, 2023 were as follows: (dollars in thousands) Due in 2024 $ 125,243 Due in 2025 550,285 Due in 2026 100,000 Due in 2028 850,000 Thereafter 2,675,000 Fair value hedge basis adjustments and unamortized prepayment fees (19,847) Total $ 4,280,681

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Other Borrowings	OTHER BORROWINGS The following table summarizes Old National’s other borrowings: December 31, (dollars in thousands) 2023 2022 Old National Bancorp: Senior unsecured notes (fixed rate 4.125%) maturing August 2024 $ 175,000 $ 175,000 Unamortized debt issuance costs related to senior unsecured notes (91) (247) Subordinated debentures (fixed rate 5.875%) maturing September 2026 150,000 150,000 Junior subordinated debentures (rates of 6.95% to 9.22%) maturing July 2031 to September 2037 136,643 136,643 Other basis adjustments 18,207 23,363 Old National Bank: Finance lease liabilities 20,955 13,469 Subordinated debentures (3-month SOFR plus 4.618%; variable rate 10.01%) maturing October 2025 12,000 12,000 Leveraged loans for NMTC (fixed rates of 1.00% to 1.43%) maturing December 2046 to June 2060 154,284 143,187 Other (1) 97,872 89,588 Total other borrowings $ 764,870 $ 743,003 (1) Includes overnight borrowings to collateralize certain derivative positions totaling $97.6 million at December 31, 2023 and $88.0 million at December 31, 2022. Contractual maturities of other borrowings at December 31, 2023 were as follows: (dollars in thousands) Due in 2024 $ 275,263 Due in 2025 14,740 Due in 2026 151,576 Due in 2027 1,636 Due in 2028 1,594 Thereafter 301,683 Unamortized debt issuance costs and other basis adjustments 18,378 Total $ 764,870 Junior Subordinated Debentures Junior subordinated debentures related to trust preferred securities are classified in “other borrowings.” Junior subordinated debentures qualify as Tier 2 capital for regulatory purposes, subject to certain limitations. Through various mergers and acquisitions, Old National assumed junior subordinated debenture obligations related to various trusts that issued trust preferred securities. Old National guarantees the payment of distributions on the trust preferred securities issued by the trusts. Proceeds from the issuance of each of these securities were used to purchase junior subordinated debentures with the same financial terms as the securities issued by the trusts. Old National, at any time, may redeem the junior subordinated debentures at par and, thereby cause a redemption of the trust preferred securities in whole or in part. The following table summarizes the terms of our outstanding junior subordinated debentures as of December 31, 2023: (dollars in thousands) Name of Trust Issuance Date Issuance Rate Rate at December 31, Maturity Date Bridgeview Statutory Trust I July 2001 $ 15,464 3-month SOFR plus 3.58% 9.22 % July 31, 2031 Bridgeview Capital Trust II December 2002 15,464 3-month SOFR plus 3.35% 9.01 % January 7, 2033 First Midwest Capital Trust I November 2003 37,825 6.95% fixed 6.95 % December 1, 2033 St. Joseph Capital Trust II March 2005 5,155 3-month SOFR plus 1.75% 7.39 % March 17, 2035 Northern States Statutory Trust I September 2005 10,310 3-month SOFR plus 1.80% 7.45 % September 15, 2035 Anchor Capital Trust III August 2005 5,000 3-month SOFR plus 1.55% 7.14 % September 30, 2035 Great Lakes Statutory Trust II December 2005 6,186 3-month SOFR plus 1.40% 7.05 % December 15, 2035 Home Federal Statutory September 2006 15,464 3-month SOFR plus 1.65% 7.30 % September 15, 2036 Monroe Bancorp Capital July 2006 3,093 3-month SOFR plus 1.60% 7.26 % October 7, 2036 Tower Capital Trust 3 December 2006 9,279 3-month SOFR plus 1.69% 7.33 % March 1, 2037 Monroe Bancorp Statutory March 2007 5,155 3-month SOFR plus 1.60% 7.25 % June 15, 2037 Great Lakes Statutory Trust III June 2007 8,248 3-month SOFR plus 1.70% 7.35 % September 15, 2037 Total $ 136,643 Leveraged Loans The leveraged loans are directly related to the NMTC structure. As part of the transaction structure, Old National has the right to sell its interest in the entity that received the leveraged loans at an agreed upon price to the leveraged lender at the end of the NMTC seven-year compliance period. See Note 9 to the consolidated financial statements for additional information on the Company’s NMTC investments. Finance Lease Liabilities Old National has long-term finance lease liabilities for certain banking centers and equipment totaling $21.0 million at December 31, 2023. See Note 6 to the consolidated financial statements for a maturity analysis of the Company’s finance lease liabilities.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table summarizes the changes within each classification of AOCI, net of tax: (dollars in thousands) Unrealized Unrealized Gains and Defined Total Year Ended December 31, 2023 Balance at beginning of period $ (642,346) $ (112,664) $ (31,549) $ 137 $ (786,422) Other comprehensive income (loss) before (14,817) 1,325 51,871 — 38,379 Amounts reclassified from AOCI to income (1) 4,645 15,867 (11,141) (137) 9,234 Balance at end of period $ (652,518) $ (95,472) $ 9,181 $ — $ (738,809) Year Ended December 31, 2022 Balance at beginning of period $ (2,950) $ — $ 543 $ 32 $ (2,375) Other comprehensive income (loss) before (639,463) (125,229) (34,043) — (798,735) Amounts reclassified from AOCI to income (1) 67 12,565 1,951 105 14,688 Balance at end of period $ (642,346) $ (112,664) $ (31,549) $ 137 $ (786,422) Year Ended December 31, 2021 Balance at beginning of period $ 145,335 $ — $ 2,584 $ (148) $ 147,771 Other comprehensive income (loss) before (144,948) — 1,433 — (143,515) Amounts reclassified from AOCI to income (1) (3,337) — (3,474) 180 (6,631) Balance at end of period $ (2,950) $ — $ 543 $ 32 $ (2,375) (1) See table below for details about reclassifications to income. The following table summarizes the significant amounts reclassified out of each component of AOCI: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Details about AOCI Components Amount Reclassified Affected Line Item in the Unrealized gains and losses on $ (6,265) $ (88) $ 4,327 Debt securities gains (losses), net 1,620 21 (990) Income tax (expense) benefit $ (4,645) $ (67) $ 3,337 Net income Amortization of unrealized losses on $ (21,239) $ (16,612) $ — Interest income (expense) 5,372 4,047 — Income tax (expense) benefit $ (15,867) $ (12,565) $ — Net income Gains and losses on hedges $ 15,067 $ (2,587) $ 4,605 Interest income (expense) (3,926) 636 (1,131) Income tax (expense) benefit $ 11,141 $ (1,951) $ 3,474 Net income Amortization of defined benefit Actuarial gains (losses) $ 182 $ (139) $ (239) Salaries and employee benefits (45) 34 59 Income tax (expense) benefit $ 137 $ (105) $ (180) Net income Total reclassifications for the period $ (9,234) $ (14,688) $ 6,631 Net income

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statement of income: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Provision at statutory rate of 21% $ 157,774 $ 114,394 $ 71,161 Tax-exempt income: Tax-exempt interest (18,582) (14,588) (11,066) Section 291/265 interest disallowance 2,392 363 114 Company-owned life insurance income (3,125) (2,891) (2,138) Tax-exempt income (19,315) (17,116) (13,090) State income taxes 31,164 20,837 9,308 Tax credit investments - federal (12,190) (9,140) (5,212) Officer compensation limitation 4,685 5,903 564 Non-deductible FDIC premiums 7,912 3,805 438 Other, net (720) (2,237) (1,845) Income tax expense $ 169,310 $ 116,446 $ 61,324 Effective tax rate 22.5 % 21.4 % 18.1 % The provision for income taxes consisted of the following components: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Current expense: Federal $ 121,428 $ 106,918 $ 31,943 State 37,331 32,898 8,461 Deferred expense: Federal 7,941 (16,216) 17,514 State 2,610 (7,154) 3,406 Deferred income tax expense 10,551 (23,370) 20,920 Income tax expense $ 169,310 $ 116,446 $ 61,324 Net Deferred Tax Assets Net deferred tax assets are included in other assets on the balance sheet. Significant components of net deferred tax assets (liabilities) were as follows: December 31, (dollars in thousands) 2023 2022 Deferred Tax Assets Unrealized losses on available-for-sale investment securities $ 217,018 $ 202,101 Allowance for credit losses on loans, net of recapture 86,224 85,619 Operating lease liabilities 57,996 58,288 Unrealized losses on held-to-maturity investment securities 32,150 36,197 Acquired loans 32,011 40,723 Benefit plan accruals 31,679 38,038 Purchase accounting 22,473 20,063 Net operating loss carryforwards 21,004 25,135 FDIC deductible premiums 4,891 — Unrealized losses on hedges — 10,277 Other, net 4,860 4,962 Total deferred tax assets 510,306 521,403 Deferred Tax Liabilities Operating lease right-of-use assets (52,710) (51,845) Premises and equipment (12,141) (14,844) Loan servicing rights (9,188) (9,636) Prepaid expenses (3,856) (2,774) Unrealized gains on hedges (3,202) — Deferred loan origination fees (2,361) (3,566) Other, net (3,588) (2,983) Total deferred tax liabilities (87,046) (85,648) Net deferred tax assets $ 423,260 $ 435,755 The Company’s retained earnings at December 31, 2023 included an appropriation for acquired thrifts’ tax bad debt allowances totaling $58.6 million for which no provision for federal or state income taxes has been made. If in the future, this portion of retained earnings were distributed as a result of the liquidation of the Company or its subsidiaries, federal and state income taxes would be imposed at the then applicable rates. No valuation allowance was required on the Company’s deferred tax assets at December 31, 2023 or 2022. Old National has federal net operating loss carryforwards totaling $63.6 million at December 31, 2023 and $81.5 million at December 31, 2022. This federal net operating loss was acquired from the acquisition of Anchor BanCorp Wisconsin Inc. in 2016 and First Midwest in 2022. If not used, the federal net operating loss carryforwards will begin expiring in 2030 and later. Old National has recorded state net operating loss carryforwards totaling $116.9 million at December 31, 2023 and $124.4 million at December 31, 2022. If not used, the state net operating loss carryforwards will expire from 2027 to 2036. The federal and recorded state net operating loss carryforwards are subject to an annual limitation under Internal Revenue Code section 382. Old National believes that all of the federal and recorded state net operating loss carryforwards will be used prior to expiration. Unrecognized Tax Benefits Old National has unrecognized tax benefits due to the merger with First Midwest. The following table presents the changes in the carrying amount of unrecognized tax benefits: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 11,007 $ — $ — Additions for acquired uncertain tax positions — 14,897 — Additions based on tax positions related to prior years 60 — — Reductions for tax positions relating to prior years — (2,751) — Reductions due to statute of limitations expiring (1,112) (1,139) — Balance at end of period $ 9,955 $ 11,007 $ — If recognized, approximately $8.0 million of unrecognized tax benefits, net of interest, would favorably affect the effective income tax rate in future periods. Old National expects the $8.0 million of unrecognized tax benefits to be reduced to $5.6 million in the next twelve months. It is our policy to recognize interest and penalties accrued relative to unrecognized tax benefits in their respective federal or state income tax accounts. Interest and penalties recorded and accrued in 2023 and 2022 were immaterial. Old National and its subsidiaries file a consolidated U.S. federal income tax return, as well as filing various state returns. The 2020 through 2023 tax years are open and subject to examination.

Share-Based Compensation and Ot

Share-Based Compensation and Other Employee Benefit Plans	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation and Other Employee Benefit Plans	SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS Our Amended and Restated 2008 Incentive Compensation Plan (the “ICP”), which was approved by shareholders, permits the grant of share-based awards to our employees. At December 31, 2023, 7.6 million shares were available for issuance. The granting of awards to key employees is typically in the form of restricted stock awards or units. We believe that such awards better align the interests of our employees with those of our shareholders. Total compensation cost included in salaries and employee benefits for the ICP was $27.9 million in 2023, $28.7 million in 2022, and $7.5 million in 2021. The total income tax benefit was $6.9 million in 2023, $7.1 million in 2022, and $1.8 million in 2021. Restricted Stock Awards Restricted stock awards require certain service requirements and shares generally vest, depending on the award terms, annually over a three-year period, cliff vest in three years from the grant date, or vest 50% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. Compensation expense is recognized on a straight-line basis over the vesting period. Shares are subject to certain restrictions and risk of forfeiture by the participants. A summary of changes in our unvested shares follows: Years Ended December 31, 2023 2022 (shares in thousands) Shares Weighted Shares Weighted Unvested balance at beginning of period 1,869 $17.76 554 $16.16 Granted during the year 1,042 15.43 1,916 18.12 Vested during the year (924) 17.80 (453) 17.29 Forfeited during the year (55) 16.84 (148) 17.88 Unvested balance at end of period 1,932 $16.51 1,869 $17.76 As of December 31, 2023, there was $18.1 million of total unrecognized compensation cost related to unvested restricted stock awards. The cost is expected to be recognized over a weighted-average period of 1.9 years. The total fair value of the shares vested was $15.1 million in 2023, $7.9 million in 2022, and $4.3 million in 2021. Performance-Based Restricted Stock Units Restricted stock units require certain performance goals to be achieved and shares vest at the end of a 36 month period based on the achievement of certain targets. Compensation expense is recognized on a straight-line basis over the performance period of the award. For certain awards, the level of performance could increase or decrease the number of shares earned. Shares are subject to certain restrictions and risk of forfeiture by the participants. A summary of changes in our unvested shares follows: Years Ended December 31, 2023 2022 (shares in thousands) Shares Weighted Shares Weighted Unvested balance at beginning of period 2,081 $17.23 886 $14.80 Granted during the year 355 18.01 1,935 17.66 Vested during the year (1,286) 16.29 (720) 15.41 Forfeited during the year (8) 17.82 (73) 16.73 Dividend equivalents adjustment 35 17.21 53 16.82 Unvested balance at end of period 1,177 $17.50 2,081 $17.23 As of December 31, 2023, there was $6.2 million of total unrecognized compensation cost related to unvested restricted stock units. The cost is expected to be recognized over a weighted-average period of 1.7 years. Stock Options and Appreciation Rights Old National has not granted stock options since 2009. However, Old National did acquire stock options and stock appreciation rights through its prior acquisitions. Old National recorded no incremental expense associated with the conversion of these options and stock appreciation rights. As of December 31, 2023, all options were fully vested, and all compensation costs had been expensed. At December 31, 2023, no stock appreciation rights were outstanding as the remaining awards were exercised during 2023. Information related to stock option and appreciation rights follows: Year Ended December 31, (dollars in thousands) 2023 2022 2021 Intrinsic value of options/appreciation rights exercised $ 70 $ 331 $ 171 Tax benefit realized from options/appreciation rights exercises 28 132 68 Non-employee Director Stock Compensation Compensation paid to Old National’s non-employee directors includes a stock component. Compensation shares are earned annually. Any shares awarded to directors are anticipated to be issued from the ICP. In 2023, 41 thousand shares were issued to directors, compared to 19 thousand shares in 2022, and 25 thousand shares in 2021. Employee Stock Ownership Plan The Employee Stock Ownership and Savings Plan (the “401(k) Plan”) allows employees to make pre-tax and Roth 401(k) contributions. Subject to the conditions and limitations of the 401(k) Plan, new employees are automatically enrolled in the 401(k) Plan with an automatic deferral of 5% of eligible compensation, unless participation is changed or declined. All active participants receive a Company match of 100% of the first 5% contributed into the 401(k) Plan. In addition to matching contributions, Old National may make discretionary contributions to the 401(k) Plan in the form of Old National stock or cash. There were no designated discretionary profit sharing contributions in 2023, 2022, or 2021. All contributions vest immediately, and plan participants may elect to redirect funds among any of the investment options provided under the 401( k) Plan. The number of Old National shares in the 401(k) Plan were 1.1 million at December 31, 2023 and 1.2 million at December 31, 2022. All shares owned through the 401(k) Plan are included in the calculation of weighted-average shares outstanding for purposes of calculating diluted and basic earnings per share. Contribution expense under the 401(k) Plan was $20.3 million in 2023, $17.9 million in 2022, and $9.8 million in 2021.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Stock Purchase and Dividend Reinvestment Plan Old National has a stock purchase and dividend reinvestment plan under which common shares issued may be either repurchased shares or authorized and previously unissued shares. A new plan became effective on August 12, 2021, with total authorized and unissued common shares reserved for issuance of 3.3 million. At December 31, 2023, 3.3 million authorized and unissued common shares were available for issuance under the plan. Employee Stock Purchase Plan Old National has an employee stock purchase plan under which eligible employees can purchase common shares at a discount to the market price. Currently, the discount under the plan is set at 5% of the fair value of the common shares on the purchase date (i.e., at a purchase price of 95%). No participant may purchase common shares with a fair value in excess of $25,000 in any calendar year. In 2023, 75,000 shares were issued related to this plan with proceeds of approximately $1.1 million. In 2022, 52,000 shares were issued related to this plan with proceeds of approximately $0.8 million. Share Repurchase Program In the first quarter of 2023, the Board of Directors approved a stock repurchase program that authorized the Company to repurchase up to $200 million of the Company’s outstanding shares of Common Stock, as conditions warrant, through February 29, 2024. During 2023, 1.8 million common shares were repurchased under the plan, which reduced equity by $29.5 million. On February 21, 2024, the Board of Directors approved a new stock repurchase program, under which the Company is authorized to repurchase up to $200 million of its outstanding common stock through February 28, 2025. This new stock repurchase program replaces the prior $200 million program, which was scheduled to expire February 29, 2024. Net Income per Common Share Basic and diluted net income per common share are calculated using the two-class method. Net income applicable to common shares is divided by the weighted-average number of common shares outstanding during the period. Adjustments to the weighted-average number of common shares outstanding are made only when such adjustments will dilute net income per common share. Net income applicable to common shares is then divided by the weighted-average number of common shares and common share equivalents during the period. The following table presents the calculation of basic and diluted net income per common share: (dollars and shares in thousands, Years Ended December 31, 2023 2022 2021 Net income $ 581,992 $ 428,287 $ 277,538 Preferred dividends (16,135) (14,118) — Net income applicable to common shares $ 565,857 $ 414,169 $ 277,538 Weighted average common shares outstanding: Weighted average common shares outstanding (basic) 290,748 275,179 165,178 Effect of dilutive securities: Restricted stock 1,107 1,502 729 Stock appreciation rights — 7 22 Weighted average diluted shares outstanding 291,855 276,688 165,929 Basic Net Income Per Common Share $ 1.95 $ 1.51 $ 1.68 Diluted Net Income Per Common Share $ 1.94 $ 1.50 $ 1.67

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values: • Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. • Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. • Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Old National used the following methods and significant assumptions to estimate the fair value of each type of financial instrument: Investment securities and equity securities : The fair values for investment securities and equity securities are determined by quoted market prices, if available (Level 1). For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows or other market indicators (Level 3). Discounted cash flows are calculated using swap and SOFR curves plus spreads that adjust for loss severities, volatility, credit risk, and optionality. During times when trading is more liquid, broker quotes are used (if available) to validate the model. Rating agency and industry research reports as well as defaults and deferrals on individual securities are reviewed and incorporated into the calculations. Loans held-for-sale : The fair value of loans held-for-sale is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan (Level 2). Derivative financial instruments : The fair values of derivative financial instruments are based on market quotes developed using observable inputs as of the valuation date (Level 2). Recurring Basis Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which we have elected the fair value option, are summarized below: Fair Value Measurements at December 31, 2023 Using (dollars in thousands) Carrying Value Quoted Prices in Significant Significant Financial Assets Equity securities $ 80,372 $ 80,372 $ — $ — Investment securities available-for-sale: U.S. Treasury 396,733 396,733 — — U.S. government-sponsored entities and agencies 1,231,264 — 1,231,264 — Mortgage-backed securities - Agency 4,216,560 — 4,216,560 — States and political subdivisions 535,260 — 535,260 — Pooled trust preferred securities 11,337 — 11,337 — Other securities 321,901 — 321,901 — Loans held-for-sale 32,006 — 32,006 — Derivative assets 166,302 — 166,302 — Financial Liabilities Derivative liabilities 268,916 — 268,916 — Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Equity securities $ 52,507 $ 52,507 $ — $ — Investment securities available-for-sale: U.S. Treasury 200,927 200,927 — — U.S. government-sponsored entities and agencies 1,175,080 — 1,175,080 — Mortgage-backed securities - Agency 4,369,902 — 4,369,902 — States and political subdivisions 663,852 — 663,852 — Pooled trust preferred securities 10,811 — 10,811 — Other securities 353,140 — 353,140 — Loans held-for-sale 11,926 — 11,926 — Derivative assets 169,001 — 169,001 — Financial Liabilities Derivative liabilities 380,704 — 380,704 — Non-Recurring Basis Assets measured at fair value on a non-recurring basis at December 31, 2023 are summarized below: Fair Value Measurements at December 31, 2023 Using (dollars in thousands) Carrying Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Significant Unobservable Inputs Collateral Dependent Loans: Commercial loans $ 11,017 $ — $ — $ 11,017 Commercial real estate loans 95,457 — — 95,457 Foreclosed Assets: Commercial real estate 1,669 — — 1,669 Commercial and commercial real estate loans that are deemed collateral dependent are valued using the discounted cash flows. The liquidation amounts are based on the fair value of the underlying collateral using the most recently available appraisals with certain adjustments made based on the type of property, age of appraisal, current status of the property, and other related factors to estimate the current value of the collateral. These commercial and commercial real estate loans had a principal amount of $134.3 million, with a valuation allowance of $27.9 million at December 31, 2023. Old National recorded provision expense associated with commercial and commercial real estate loans that were deemed collateral dependent totaling $20.5 million in 2023. Other real estate owned and other repossessed property is measured at fair value less costs to sell on a non-recurring basis. Old National did not have any other real estate owned or repossessed property measured at fair value on a non-recurring basis at December 31, 2023. There were write-downs of other real estate owned of $0.1 million in 2023. Assets measured at fair value on a non-recurring basis at December 31, 2022 are summarized below: Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Collateral Dependent Loans: Commercial loans $ 22,562 $ — $ — $ 22,562 Commercial real estate loans 48,026 — — 48,026 At December 31, 2022, commercial and commercial real estate loans that were deemed collateral dependent had a principal amount of $92.0 million, with a valuation allowance of $21.5 million. Old National recorded provision expense associated with these loans totaling $20.3 million in 2022. Old National did not have any other real estate owned or repossessed property measured at fair value on a non-recurring basis at December 31, 2022. There were write-downs of other real estate owned of $0.6 million in 2022. The table below provides quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy: (dollars in thousands) Fair Valuation Unobservable Range (Weighted Average) (1) December 31, 2023 Collateral Dependent Loans Commercial loans $ 11,017 Discounted Discount for type of property, 5% - 37% (27%) Commercial real estate loans 95,457 Discounted Discount for type of property, 2% - 38% (16%) Foreclosed Assets Commercial real estate (1) 1,669 Fair value of collateral Discount for type of property, 4% - 8% (4%) December 31, 2022 Collateral Dependent Loans Commercial loans $ 22,562 Discounted Discount for type of property, 10% - 47% (28%) Commercial real estate loans 48,026 Discounted Discount for type of property, 1% - 26% (11%) (1) Unobservable inputs were weighted by the relative fair value of the instruments. Fair Value Option Old National may elect to report most financial instruments and certain other items at fair value on an instrument-by-instrument basis with changes in fair value reported in net income. After the initial adoption, the election is made at the acquisition of an eligible financial asset, financial liability, or firm commitment or when certain specified reconsideration events occur. The fair value election may not be revoked once an election is made. Loans Held-For-Sale Old National has elected the fair value option for loans held-for-sale. For these loans, interest income is recorded in the consolidated statements of income based on the contractual amount of interest income earned on the financial assets (except any that are on nonaccrual status). None of these loans are 90 days or more past due, nor are any on nonaccrual status. Included in the income statement is interest income for loans held-for-sale totaling $1.2 million in 2023, $1.8 million in 2022, and $1.5 million in 2021. Newly originated conforming fixed-rate and adjustable-rate first mortgage loans are intended for sale and are hedged with derivative instruments. Old National has elected the fair value option to mitigate accounting mismatches in cases where hedge accounting is complex and to achieve operational simplification. The fair value option was not elected for loans held for investment. The difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected was as follows: (dollars in thousands) Aggregate Difference Contractual December 31, 2023 Loans held-for-sale $ 32,006 $ 621 $ 31,385 December 31, 2022 Loans held-for-sale $ 11,926 $ 221 $ 11,705 Accrued interest at period end is included in the fair value of the instruments. The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value: (dollars in thousands) Other Interest Interest Total Changes Year Ended December 31, 2023 Loans held-for-sale $ 402 $ 12 $ (14) $ 400 Year Ended December 31, 2022 Loans held-for-sale $ (1,127) $ 10 $ (4) $ (1,121) Financial Instruments Not Carried at Fair Value The carrying amounts and estimated fair values of financial instruments not carried at fair value were as follows: Fair Value Measurements at December 31, 2023 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Cash, due from banks, money market, $ 1,175,058 $ 1,175,058 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 825,953 — 671,126 — Mortgage-backed securities - Agency 1,029,131 — 881,994 — State and political subdivisions 1,158,409 — 1,048,068 — Loans, net: Commercial 9,392,267 — — 9,258,193 Commercial real estate 13,984,273 — — 13,640,868 Residential real estate 6,678,606 — — 5,579,999 Consumer 2,629,171 — — 2,555,121 Accrued interest receivable 225,159 859 54,465 169,835 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 9,664,247 $ 9,664,247 $ — $ — Checking, NOW, savings, and money market 21,991,789 21,991,789 — — Time deposits 5,579,144 — 5,552,538 — Federal funds purchased and interbank borrowings 390 390 — — Securities sold under agreements to repurchase 285,206 285,206 — — FHLB advances 4,280,681 — 4,090,954 — Other borrowings 764,870 — 755,592 — Accrued interest payable 57,094 — 57,094 — Standby letters of credit 1,318 — — 1,318 Off-Balance Sheet Financial Instruments Commitments to extend credit $ — $ — $ — $ 3,839 Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Cash, due from banks, money market, $ 728,412 $ 728,412 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 819,168 — 656,358 — Mortgage-backed securities - Agency 1,106,817 — 982,963 — State and political subdivisions 1,163,162 — 1,004,361 — Loans, net: Commercial 9,386,862 — — 9,066,583 Commercial real estate 12,317,825 — — 11,867,851 Residential real estate 6,438,525 — — 5,372,491 Consumer 2,676,758 — — 2,557,115 Accrued interest receivable 190,521 758 52,081 137,682 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 11,930,798 $ 11,930,798 $ — $ — Checking, NOW, savings, and money market 20,056,252 20,056,252 — — Time deposits 3,013,780 — 2,976,389 — Federal funds purchased and interbank borrowings 581,489 581,489 — — Securities sold under agreements to repurchase 432,804 432,804 — — FHLB advances 3,829,018 — 3,739,780 — Other borrowings 743,003 — 703,156 — Accrued interest payable 19,547 — 19,547 — Standby letters of credit 755 — — 755 Off-Balance Sheet Financial Instruments Commitments to extend credit $ — $ — $ — $ 3,666 The methods utilized to measure the fair value of financial instruments at December 31, 2023 and 2022 represent an approximation of exit price, however, an actual exit price may differ.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS As part of our overall interest rate risk management, Old National uses derivative instruments, including interest rate swaps, collars, caps, and floors. The notional amount does not represent amounts exchanged by the parties. The amount exchanged is determined by reference to the notional amount and the other terms of the individual agreements. Derivative instruments are recognized on the balance sheet at their fair value and are not reported on a net basis. Credit risk arises from the possible inability of counterparties to meet the terms of their contracts. Old National’s exposure is limited to the termination value of the contracts rather than the notional, principal, or contract amounts. There are provisions in our agreements with the counterparties that allow for certain unsecured credit exposure up to an agreed threshold. Exposures in excess of the agreed thresholds are collateralized. In addition, we minimize credit risk through credit approvals, limits, and monitoring procedures. Derivatives Designated as Hedges Subsequent changes in fair value for a hedging instrument that has been designated and qualifies as part of a hedging relationship are accounted for in the following manner: Cash flow hedges : changes in fair value are recognized as a component in other comprehensive income (loss). Fair value hedges : changes in fair value are recognized concurrently in earnings. As long as a hedging instrument is designated and the results of the effectiveness testing support that the instrument qualifies for hedge accounting treatment, 100% of the periodic changes in fair value of the hedging instrument are accounted for as outlined above. This is the case whether or not economic mismatches exist in the hedging relationship. As a result, there is no periodic measurement or recognition of ineffectiveness. Rather, the full impact of hedge gains and losses is recognized in the period in which the hedged transactions impact earnings. The change in fair value of the hedging instrument that is included in the assessment of hedge effectiveness is presented in the same income statement line item that is used to present the earnings effect of the hedged item. Cash Flow Hedges Interest rate swaps of certain borrowings were designated as cash flow hedges totaling $150.0 million notional amount at both December 31, 2023 and December 31, 2022. Interest rate collars and floors related to variable-rate commercial loan pools were designated as cash flow hedges totaling $1.6 billion notional amount at December 31, 2023 and $1.9 billion notional amount at December 31, 2022. The hedges were determined to be effective during all periods presented and we expect them to remain effective during the remaining terms. Old National has designated its interest rate collars as cash flow hedges. The structure of these instruments is such that Old National pays the counterparty an incremental amount if the collar index exceeds the cap rate. Conversely, Old National receives an incremental amount if the index falls below the floor rate. No payments are required if the collar index falls between the cap and floor rates. Old National has designated its interest rate floor transactions as cash flow hedges. The structure of these instruments is such that Old National receives an incremental amount if the index falls below the floor strike rate. No payments are required if the index remains above the floor strike rate. Fair Value Hedges Interest rate swaps of certain borrowings were designated as fair value hedges totaling $900.0 million notional amount at December 31, 2023 and $300.0 million notional amount at December 31, 2022. Interest rate swaps of certain available-for-sale investment securities were designated as fair value hedges totaling $998.1 million notional amount at December 31, 2023 and $910.0 million notional amount at December 31, 2022. The hedges were determined to be effective during all periods presented and we expect them to remain effective during the remaining terms. The following table summarizes Old National’s derivatives designated as hedges: December 31, 2023 December 31, 2022 Fair Value Fair Value (dollars in thousands) Notional Assets (1) Liabilities (2) Notional Assets (1) Liabilities (2) Cash flow hedges: Interest rate collars and floors on loan pools $ 1,600,000 $ 10,472 $ 6,014 $ 1,900,000 $ 11,764 $ 47,859 Interest rate swaps on borrowings (3) 150,000 — — 150,000 — — Fair value hedges: Interest rate swaps on investment securities (3) 998,107 — — 909,957 — — Interest rate swaps on borrowings (3) 900,000 — — 300,000 — — Total $ 10,472 $ 6,014 $ 11,764 $ 47,859 (1) Derivative assets are included in other assets on the balance sheet. (2) Derivative liabilities are included in other liabilities on the balance sheet. (3) The fair values of certain counterparty interest rate swaps are zero due to the settlement of centrally cleared variation margin rules. The effect of derivative instruments in fair value hedging relationships on the consolidated statements of income were as follows: (dollars in thousands) Gain (Loss) Derivatives in Location of Gain or Gain (Loss) Hedged Items Location of Gain or Year Ended Interest rate contracts Interest income/(expense) $ (1,769) Fixed-rate debt Interest income/(expense) $ 1,684 Interest rate contracts Interest income/(expense) (52,625) Fixed-rate Interest income/(expense) 52,148 Total $ (54,394) $ 53,832 Year Ended Interest rate contracts Interest income/(expense) $ (6,245) Fixed-rate debt Interest income/(expense) $ 6,585 Interest rate contracts Interest income/(expense) 157,741 Fixed-rate Interest income/(expense) (158,431) Total $ 151,496 $ (151,846) Year Ended Interest rate contracts Interest income/(expense) $ (6,413) Fixed-rate debt Interest income/(expense) $ 6,296 Interest rate contracts Interest income/(expense) (4,656) Fixed-rate Interest income/(expense) 4,954 Total $ (11,069) $ 11,250 The effect of derivative instruments in cash flow hedging relationships on the consolidated statements of income were as follows: Years Ended December 31, Years Ended December 31, 2023 2022 2021 2023 2022 2021 Derivatives in Location of Gain or Gain (Loss) Gain (Loss) Interest rate contracts Interest income/(expense) $ 28,029 $ (45,132) $ 1,898 $ 11,621 $ (2,587) $ 4,605 Amounts reported in AOCI related to cash flow hedges will be reclassified to interest income or interest expense as interest payments are received or paid on Old National’s derivative instruments. During the next 12 months, we estimate that $6.1 million will be reclassified to interest income and $20.6 million will be reclassified to interest expense. Derivatives Not Designated as Hedges Commitments to fund certain mortgage loans (interest rate lock commitments) and forward commitments for the future delivery of mortgage loans to third party investors are considered derivatives. These derivative contracts do not qualify for hedge accounting. At December 31, 2023, the notional amounts of the interest rate lock commitments were $25.2 million and forward commitments were $39.5 million. At December 31, 2022, the notional amounts of the interest rate lock commitments were $21.4 million and forward commitments were $30.3 million. It is our practice to enter into forward commitments for the future delivery of residential mortgage loans to third party investors when interest rate lock commitments are entered into in order to economically hedge the effect of changes in interest rates resulting from our commitment to fund the loans. Old National also enters into derivative instruments for the benefit of its clients. The notional amounts of these customer derivative instruments and the offsetting counterparty derivative instruments were $6.0 billion at December 31, 2023 and $5.2 billion at December 31, 2022. These derivative contracts do not qualify for hedge accounting. These instruments include interest rate swaps, caps, and collars. Commonly, Old National will economically hedge significant exposures related to these derivative contracts entered into for the benefit of clients by entering into offsetting contracts with approved, reputable, independent counterparties with substantially matching terms. Old National enters into derivative financial instruments as part of its foreign currency risk management strategies. These derivative instruments consist of foreign currency forward contracts to accommodate the business needs of its clients. Old National does not designate these foreign currency forward contracts for hedge accounting treatment. The following table summarizes Old National’s derivatives not designated as hedges: December 31, 2023 December 31, 2022 Fair Value Fair Value (dollars in thousands) Notional Assets (1) Liabilities (2) Notional Assets (1) Liabilities (2) Interest rate lock commitments $ 25,151 $ 291 $ — $ 21,401 $ 93 $ — Forward mortgage loan contracts 39,529 — 566 30,330 32 — Customer interest rate swaps 5,954,216 33,182 228,750 5,220,363 5,676 326,924 Counterparty interest rate swaps (3) 5,954,216 121,969 33,346 5,220,363 151,111 5,711 Customer foreign currency forward contracts 12,455 320 59 8,341 253 42 Counterparty foreign currency forward contracts 12,308 68 181 8,297 72 168 Total $ 155,830 $ 262,902 $ 157,237 $ 332,845 (1) Derivative assets are included in other assets on the balance sheet. (2) Derivative liabilities are included in other liabilities on the balance sheet. (3) The fair values of certain counterparty interest rate swaps are zero due to the settlement of centrally-cleared variation margin rules. The effect of derivatives not designated as hedging instruments on the consolidated statements of income were as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Derivatives Not Designated as Location of Gain or (Loss) Gain (Loss) Interest rate contracts (1) Other income/(expense) $ 457 $ 883 $ 279 Mortgage contracts Mortgage banking revenue (401) (2,468) (4,446) Foreign currency contracts Other income/(expense) (45) 98 (104) Total $ 11 $ (1,487) $ (4,271) (1) Includes the valuation differences between the customer and offsetting swaps. Fair Value of Offsetting Derivatives Certain derivative instruments are subject to master netting agreements with counterparties that provide rights of setoff. The Company records these transactions at their gross fair values and does not offset derivative assets and liabilities in the Consolidated Balance Sheet. The following table presents the fair value of the Company’s derivatives and offsetting positions: December 31, 2023 2022 (dollars in thousands) Assets Liabilities Assets Liabilities Gross amounts recognized $ 166,302 $ 268,916 $ 169,001 $ 380,704 Less: amounts offset in the Consolidated Balance Sheet — — — — Net amount presented in the Consolidated Balance Sheet 166,302 268,916 169,001 380,704 Gross amounts not offset in the Consolidated Balance Sheet Offsetting derivative positions (39,360) (39,360) (54,054) (54,054) Cash collateral pledged — (97,840) (418) (88,860) Net credit exposure $ 126,942 $ 131,716 $ 114,529 $ 237,790

Commitments, Contingencies, and

Commitments, Contingencies, and Financial Guarantees	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies, and Financial Guarantees	COMMITMENTS, CONTINGENCIES, AND FINANCIAL GUARANTEES Litigation At December 31, 2023, there were certain legal proceedings pending against the Company and its subsidiaries in the ordinary course of business. While the outcome of any legal proceeding is inherently uncertain, based on information currently available, the Company’s management does not expect that any potential liabilities arising from pending legal matters will have a material adverse effect on the Company’s business, financial position, or results of operations. Credit-Related Financial Instruments Old National holds instruments, in the normal course of business with clients, that are considered financial guarantees and are recorded at fair value. Standby letters of credit guarantees are issued in connection with agreements made by clients to counterparties. Standby letters of credit are contingent upon failure of the client to perform the terms of the underlying contract. Credit risk associated with standby letters of credit is essentially the same as that associated with extending loans to clients and is subject to normal credit policies. The term of these standby letters of credit is typically one year or less. These commitments are not recorded in the consolidated financial statements. The following table summarizes Old National Bank’s unfunded loan commitments and standby letters of credit: December 31, (dollars in thousands) 2023 2022 Unfunded loan commitments $ 8,912,587 $ 8,979,334 Standby letters of credit (1) 192,237 174,070 (1) Notional amount, which represents the maximum amount of future funding requirements. The carrying value was $1.3 million at December 31, 2023 and $0.8 million at December 31, 2022. At December 31, 2023, approximately 4% of the unfunded loan commitments had fixed rates, with the remainder having floating rates ranging from 2.10% to 22.49%. The allowance for unfunded loan commitments totaled $31.2 million at December 31, 2023 and $32.2 million at December 31, 2022. Old National is a party in risk participation transactions of interest rate swaps, which had total notional amounts of $557.8 million at December 31, 2023 and $398.9 million at December 31, 2022. Visa Class B Restricted Shares In 2008, Old National received Visa Class B restricted shares as part of Visa’s initial public offering. During the fourth quarter of 2023, Old National sold the 65,466 Class B shares and recognized a $21.6 million pre-tax gain. Prior to the sale, the shares were carried at a zero cost basis due to uncertainty surrounding the ability of the Company to transfer or otherwise liquidate the shares. At December 31, 2023, the Company does not hold any remaining Visa Class B restricted shares.

Regulatory Restrictions

Regulatory Restrictions	12 Months Ended
	Dec. 31, 2023
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract]
Regulatory Restrictions	REGULATORY RESTRICTIONS Restrictions on Cash and Due from Banks Old National had cash and due from banks which was held as collateral for collateralized swap positions totaling $0.3 million at December 31, 2023 and $0.1 million at December 31, 2022. Restrictions on Transfers from Bank Subsidiary Regulations limit the amount of dividends a bank subsidiary can declare in any calendar year without obtaining prior regulatory approval. Prior regulatory approval is required if dividends to be declared in any calendar year would exceed the total of net income of the current year combined with retained net income for the preceding two years. Prior regulatory approval to pay dividends was not required in 2021, 2022, or 2023 and is not currently required. A bank subsidiary is prohibited from paying a dividend, if, after making the dividend, the bank would be considered “undercapitalized” (as defined by reference to the OCC’s capital regulations). At December 31, 2023, Old National Bank could pay dividends of $670.4 million without prior regulatory approval and while maintaining capital levels above regulatory minima and well-capitalized guidelines. Restrictions on the Payment of Dividends Old National has traditionally paid a quarterly dividend to common shareholders. The payment of dividends is subject to legal and regulatory restrictions, as well as approval by our Board of Directors. Any payment of dividends in the future will depend, in large part, on Old National’s earnings, capital requirements, financial condition, and other factors considered relevant by our Board of Directors. Capital Adequacy Old National and Old National Bank are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can elicit certain mandatory actions by regulators that, if undertaken, could have a direct material effect on Old National’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, Old National and Old National Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require Old National and Old National Bank to maintain minimum amounts and ratios as set forth in the following tables. At December 31, 2023, Old National and Old National Bank each exceeded the capital ratios required to be considered “well-capitalized” under applicable regulations. The following table summarizes capital ratios for Old National and Old National Bank: Actual Regulatory Minimum (1) Prompt Corrective Action “Well Capitalized” Guidelines (2) (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio December 31, 2023 Total capital to risk-weighted Old National Bancorp $ 4,727,216 12.64 % $ 3,927,771 10.50 % $ 3,740,735 10.00 % Old National Bank 4,591,734 12.33 3,911,089 10.50 3,724,847 10.00 Common equity Tier 1 capital Old National Bancorp 4,003,694 10.70 2,618,514 7.00 N/A N/A Old National Bank 4,308,574 11.57 2,607,393 7.00 2,421,150 6.50 Tier 1 capital to risk-weighted Old National Bancorp 4,247,413 11.35 3,179,625 8.50 2,244,441 6.00 Old National Bank 4,308,574 11.57 3,166,120 8.50 2,979,878 8.00 Tier 1 capital to average assets Old National Bancorp 4,247,413 8.83 1,923,360 4.00 N/A N/A Old National Bank 4,308,574 8.99 1,916,002 4.00 2,395,003 5.00 December 31, 2022 Total capital to risk-weighted Old National Bancorp $ 4,321,716 12.02 % $ 3,774,845 10.50 % $ 3,595,090 10.00 % Old National Bank 4,063,363 11.35 3,759,671 10.50 3,580,639 10.00 Common equity Tier 1 capital Old National Bancorp 3,605,393 10.03 2,516,563 7.00 N/A N/A Old National Bank 3,817,402 10.66 2,506,448 7.00 2,327,416 6.50 Tier 1 capital to risk-weighted Old National Bancorp 3,849,112 10.71 3,055,827 8.50 2,157,054 6.00 Old National Bank 3,817,402 10.66 3,043,544 8.50 2,864,512 8.00 Tier 1 capital to average assets Old National Bancorp 3,849,112 8.52 1,808,108 4.00 N/A N/A Old National Bank 3,817,402 8.47 1,803,426 4.00 2,254,282 5.00 (1) “Regulatory Minimum” capital ratios include the 2.5% “capital conservation buffer” required under the Basel III Capital Rules. (2) “Well-capitalized” minimum common equity Tier 1 capital to risk-weighted assets and Tier 1 capital to average assets ratios are not formally defined under applicable banking regulations for bank holding companies. During 2020, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC issued final rules to delay the estimated impact on regulatory capital stemming from the implementation of CECL. The final rules provide banking organizations the option to delay for two years an estimate of CECL’s effect on regulatory capital, relative to the incurred loss methodology’s effect on regulatory capital, followed by a three-year transition period (five-year transition option). Old National adopted the capital transition relief over the permissible five-year period.

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Parent Company Financial Statements	PARENT COMPANY FINANCIAL STATEMENTS The following are the condensed parent company only financial statements of Old National: OLD NATIONAL BANCORP (PARENT COMPANY ONLY) December 31, (dollars in thousands) 2023 2022 Assets Deposits in affiliate bank $ 284,294 $ 418,959 Equity securities 51,241 30,717 Investment securities - available-for-sale 15,886 16,814 Investment in affiliates: Banking subsidiaries 5,530,637 5,000,153 Non-banks 44,395 44,938 Goodwill 59,506 59,506 Other assets 127,540 135,025 Total assets $ 6,113,499 $ 5,706,112 Liabilities and Shareholders’ Equity Other liabilities $ 70,840 $ 92,758 Other borrowings 479,759 484,759 Shareholders’ equity 5,562,900 5,128,595 Total liabilities and shareholders’ equity $ 6,113,499 $ 5,706,112 OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2023 2022 2021 Income Dividends from affiliates $ 150,000 $ — $ 125,000 Other income 2,919 1,733 3,364 Other income from affiliates 5 5 5 Total income 152,924 1,738 128,369 Expense Interest on borrowings 20,700 16,662 8,285 Other expenses 43,185 37,629 13,951 Total expense 63,885 54,291 22,236 Income (loss) before income taxes and equity in undistributed earnings of affiliates 89,039 (52,553) 106,133 Income tax expense (benefit) (11,325) (9,901) (5,113) Income (loss) before equity in undistributed earnings of affiliates 100,364 (42,652) 111,246 Equity in undistributed earnings of affiliates 481,628 470,939 166,292 Net income 581,992 428,287 277,538 Preferred dividends (16,135) (14,118) — Net income applicable to common shareholders $ 565,857 $ 414,169 $ 277,538 OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash Flows From Operating Activities Net income $ 581,992 $ 428,287 $ 277,538 Adjustments to reconcile net income to cash Depreciation 18 26 30 Share-based compensation expense 27,910 28,656 7,497 (Increase) decrease in other assets (19,353) (40,620) 10,213 Increase (decrease) in other liabilities (2,561) 10,455 (4,918) Equity in undistributed earnings of affiliates (481,628) (470,939) (166,292) Net cash flows provided by (used in) operating activities 106,378 (44,135) 124,068 Cash Flows From Investing Activities Net cash and cash equivalents of acquisitions — 573,099 — Proceeds from sales of investment securities — — 1,000 Proceeds from sales of equity securities — 44,038 540 Purchase of equity securities (17,773) — — Purchases of investment securities — (9,000) (15) Purchases of premises and equipment (8) — (3) Net cash flows provided by (used in) investing activities (17,781) 608,137 1,522 Cash Flows From Financing Activities Cash dividends paid (180,030) (177,623) (92,829) Common stock repurchased (44,308) (71,182) (3,731) Common stock issued 1,076 809 583 Net cash flows provided by (used in) financing activities (223,262) (247,996) (95,977) Net increase (decrease) in cash and cash equivalents (134,665) 316,006 29,613 Cash and cash equivalents at beginning of period 418,959 102,953 73,340 Cash and cash equivalents at end of period $ 284,294 $ 418,959 $ 102,953

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION Operating segments are components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The chief operating decision maker managed operations and evaluated financial performance on a Company-wide basis. As a result, the Company has determined that it has only one reportable segment.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income	$ 581,992	$ 428,287	$ 277,538

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of Old National Bancorp and its wholly-owned subsidiaries (hereinafter collectively referred to as “Old National”) and have been prepared in conformity with accounting principles generally accepted in the United States of America and prevailing practices within the banking industry. Such principles require management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosures of contingent assets and liabilities at the date of the financial statements and amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. All intercompany transactions and balances have been eliminated. Certain prior year amounts have been reclassified to conform to the current presentation. Such reclassifications had no effect on prior year net income or shareholders’ equity and were insignificant amounts.
Equity Securities	Equity Securities Equity securities consist of mutual funds for Community Reinvestment Act qualified investments and diversified investment securities held in a grantor trust for participants in the Company’s nonqualified deferred compensation plan. Equity securities are recorded at fair value with changes in fair value recognized in other income.
Investment Securities	Investment Securities Old National classifies debt investment securities as available-for-sale or held-to-maturity on the date of purchase. Debt securities classified as available-for-sale are recorded at fair value with the unrealized gains and losses recorded in other comprehensive income (loss), net of tax. Realized gains and losses affect income and the prior fair value adjustments are reclassified within shareholders’ equity. Debt securities classified as held-to-maturity, which management has the intent and ability to hold to maturity, are reported at amortized cost. Interest income includes amortization of purchase premiums or discounts. Premiums and discounts are amortized on the level-yield method. Anticipated prepayments are considered when amortizing premiums and discounts on mortgage-backed securities. Gains and losses on the sale of available-for-sale debt securities are determined using the specific-identification method. Available-for-sale securities in unrealized loss positions are evaluated at least quarterly to determine if a decline in fair value should be recorded through income or other comprehensive income (loss). For available-for-sale securities in an unrealized loss position, we first assess whether we intend to sell, or it is more likely than not that we will be required to sell the security, before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For available-for-sale securities that do not meet the criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security and the issuer, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded, limited to the amount that the fair value of the security is less than its amortized cost basis. Any decline in fair value that has not been recorded through an allowance for credit losses is recognized in other comprehensive income (loss), net of applicable taxes. Accrued interest receivable on the securities portfolio is excluded from the estimate of credit losses.
Federal Home Loan Bank/Federal Reserve Bank Stock	Federal Home Loan Bank/Federal Reserve Bank Stock Old National is a member of the FHLB system and its regional Federal Reserve Bank. Members are required to own a certain amount of stock based on the level of borrowings and other factors. FHLB and Federal Reserve Bank stock are carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Loans Held-for-Sale	Loans Held-for-Sale Loans that Old National has originated with an intent to sell are classified as loans held-for-sale and are recorded at fair value, determined individually, as of the balance sheet date. The loan’s fair value includes the servicing value of the loans as well as any accrued interest. Conventional mortgage production is sold with servicing rights retained. Certain loans, such as government guaranteed mortgage loans are sold on servicing released basis.
Credit Loss	Loans Loans that Old National intends to hold are classified as held for investment. Loans held for investment are carried at the principal balance outstanding, net of earned interest, purchase premiums or discounts, deferred loan fees and costs, and an allowance for credit losses. Interest income is accrued on the principal balances of loans outstanding. For all loan classes, a loan is generally placed on nonaccrual status when principal or interest becomes 90 days past due unless it is well secured and in the process of collection, or earlier when concern exists as to the ultimate collectability of principal or interest. Interest accrued but not received is reversed against earnings. Cash interest received on these loans is applied to the principal balance until the principal is recovered or until the loan returns to accrual status. Loans may be returned to accrual status when all the principal and interest amounts contractually due are brought current, remain current for a prescribed period, and future payments are reasonably assured. Old National has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. Evidence of credit deterioration was evaluated using various indicators, such as past due and nonaccrual status, as well as asset quality rating. PCD loans are recorded at the amount paid. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and initial allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is accreted or amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. Any loans that are modified are reviewed by Old National to identify if a financial difficulty modification has occurred, which is when Old National modifies a loan related to a borrower experiencing financial difficulties. Terms may be modified to fit the ability of the borrower to repay in line with its current financial status. The modification of the terms of such loans includes one or a combination of the following: a reduction of the stated interest rate of the loan, an extension of the maturity date, a permanent reduction of the recorded investment of the loan, or an other-than-insignificant payment delay. The adoption of Accounting Standards Update (“ASU”) 2022-02 on January 1, 2023 eliminated the recognition and measurement of troubled debt restructurings (“TDRs”) and enhanced disclosures for modifications to loans related to borrowers experiencing financial difficulties. Allowance for Credit Losses on Loans Credit quality within the loans held for investment portfolio is continuously monitored by management and is reflected within the allowance for credit losses on loans. The allowance for credit losses is an estimate of expected losses inherent within the Company’s loans held for investment portfolio. Credit quality is assessed and monitored by evaluating various attributes and the results of those evaluations are utilized in underwriting new loans and in our process for estimating expected credit losses. The allowance for credit losses on loans held for investment is adjusted by a credit loss expense, which is reported in provision for credit losses, and reduced by the charge-off of loan amounts, net of recoveries within the provision for credit losses. Accrued interest receivable is excluded from the estimate of credit losses. Old National has made a policy election to present accrued interest receivable separately on the balance sheet. The allowance for credit loss estimation process involves procedures to appropriately consider the unique characteristics of our loan portfolio segments. These segments are further disaggregated into loan classes based on the level at which credit risk is monitored. When computing the level of expected credit losses, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status, and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense in those future periods. The allowance level is influenced by loan volumes, loan AQR migration or delinquency status, changes in historical loss experience, and other conditions influencing loss expectations, such as reasonable and supportable forecasts of economic conditions. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: first, an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans; and second, a pooled component for estimated expected credit losses for pools of loans that share similar risk characteristics. We utilize a discounted cashflow approach to determine the allowance for credit losses for performing loans and nonperforming loans. Expected cashflows are created for each loan and discounted using the effective yield method. The discounted sum of expected cashflows is then compared to the amortized cost and any shortfall is recorded as an allowance. Expected cashflows are created using a combination of contractual payment schedules, calculated PDs, LGD, and prepayment assumptions as well as qualitative factors. For commercial and commercial real estate loans, the PD is forecasted using a regression model to determine the likelihood of a loan moving into nonaccrual within the time horizon. For residential and consumer loans, the PD is forecasted using a regression model to determine the likelihood of a loan being charged-off within the time horizon. The regression models use combinations of variables to assess systematic and unsystematic risk. Variables used for unsystematic risk are borrower specific and help to gauge the risk of default from an individual borrower. Variables for systematic risk, risk inherent to all borrowers, come from the use of forward-looking economic forecasts and include variables such as unemployment rate, gross domestic product, and house price index. The LGD is defined as credit loss incurred when an obligor of the bank defaults. Qualitative factors include items such as changes in lending policies or procedures and economic uncertainty in forward-looking forecasts. Further information regarding Old National’s policies and methodology used to estimate the allowance for credit losses on loans is presented in Note 4 to the consolidated financial statements.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Land is stated at cost. Depreciation is charged to operating expense over the useful lives of the assets, principally on the straight-line method. Useful lives for premises and equipment are as follows: buildings and building improvements – 10 to 39 years; and furniture and equipment – 3 to 7 years. Leasehold improvements are depreciated over the lesser of their useful lives or the term of the lease. Maintenance and repairs are expensed as incurred while major additions and improvements are capitalized. Interest costs on construction of qualifying assets are capitalized. Premises and equipment are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are adjusted to fair value. Such impairments are included in other expense.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill arises from business combinations and is determined as the excess of the cost of acquired entities over the fair value of identifiable assets acquired less liabilities assumed as of the merger or acquisition date. Amortization of goodwill and indefinite-lived assets is not recorded. However, the recoverability of goodwill and other intangible assets are tested for impairment at least annually or more frequently if events and circumstances exist that indicate that a goodwill impairment test should be performed. Other intangible assets, including core deposits and customer business relationships, are amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of 5 to 15 years.
Company-Owned Life Insurance	Company-Owned Life Insurance Old National has purchased, as well as obtained through mergers and acquisitions, life insurance policies on certain key executives. Old National records company-owned life insurance at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Loan Servicing Rights	Loan Servicing Rights When loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gain on sales of loans. Fair value is based on market prices for comparable servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Loan servicing rights are included in other assets on the balance sheet. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics, such as interest rate, loan type, term, and investor type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If Old National later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income. Changes in valuation allowances are reported with mortgage banking revenue on the income statement. The fair values of servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Servicing fee income, which is reported on the income statement as mortgage banking revenue, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal, or a fixed amount per loan, and are recorded as income when earned.
Derivative Financial Instruments	Derivative Financial Instruments As part of Old National’s overall interest rate risk management, Old National uses derivative instruments, including interest rate swaps, collars, caps, and floors. All derivative instruments are recognized on the balance sheet at their fair value. At the inception of the derivative contract, Old National designates the derivative as (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), (2) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), or (3) an instrument with no hedging designation (“stand-alone derivative”). For a fair value hedge, the change in value of the derivative, as well as the offsetting change in value of the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. For a cash flow hedge, the gain or loss on the derivative is reported as a component of other comprehensive income (loss) and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, in noninterest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in noninterest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged. Old National formally documents all relationships between derivatives and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. Old National also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used in hedging transactions are highly effective in offsetting changes in fair values or cash flows of the hedged items. Old National discontinues hedge accounting prospectively when it is determined that (1) the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item; (2) the derivative expires, is sold, or terminated; (3) the derivative instrument is de-designated as a hedge because the forecasted transaction is no longer probable of occurring; (4) a hedged firm commitment no longer meets the definition of a firm commitment; or (5) management otherwise determines that designation of the derivative as a hedging instrument is no longer appropriate. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as noninterest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transaction is still expected to occur, changes in value that were accumulated in other comprehensive income (loss) are amortized or accreted into earnings over the same periods which the hedged transactions will affect earnings. Old National enters into various stand-alone mortgage-banking derivatives in order to hedge the risk associated with the fluctuation of interest rates. Changes in fair value are recorded as mortgage banking revenue. Old National also enters into various stand-alone derivative contracts to provide derivative products to clients, which are carried at fair value with changes in fair value recorded as other noninterest income. Old National is exposed to losses if a counterparty fails to make its payments under a contract in which Old National is in the net receiving position. Old National anticipates that the counterparties will be able to fully satisfy their obligations under the agreements. In addition, Old National obtains collateral above certain thresholds of the fair value of its hedges for each counterparty based upon their credit standing. All of the contracts to which Old National is a party settle monthly, quarterly, or semiannually. Further, Old National has netting agreements with the dealers with which it does business.
Credit-Related Financial Instruments	Credit-Related Financial Instruments In the ordinary course of business, Old National’s bank subsidiary has entered into credit-related financial instruments consisting of commitments to extend credit, commercial letters of credit, and standby letters of credit. The notional amount of these commitments is not reflected in the consolidated financial statements until they are funded. Old National maintains an allowance for credit losses on unfunded loan commitments to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for credit losses on loans, modified to take into account the probability of a drawdown on the commitment. The allowance for credit losses on unfunded loan commitments is classified as a liability account on the balance sheet and is adjusted as a provision for unfunded loan commitments included in the provision for credit losses.
Repossessed Collateral	Repossessed Collateral Other real estate owned and repossessed personal property are initially recorded at the fair value of the property less estimated cost to sell and are included in other assets on the balance sheet. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan through the completion of a deed in lieu of foreclosure or through a similar legal agreement. Any excess recorded investment over the fair value of the property received is charged to the allowance for credit losses. Any subsequent write-downs are recorded in noninterest expense, as are the costs of operating the properties. Gains or losses resulting from the sale of collateral are recognized in noninterest expense at the date of sale.
Securities Purchased under Agreements to Resell and Securities Sold under Agreements to Repurchase	Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase We purchase certain securities, generally U.S. government-sponsored entity and agency securities, under agreements to resell. The amounts advanced under these agreements represent short-term secured loans and are reflected as assets in the accompanying consolidated balance sheets. We also sell certain securities under agreements to repurchase. These agreements are treated as collateralized financing transactions. These secured borrowings are reflected as liabilities in the accompanying consolidated balance sheets and are recorded at the amount of cash received in connection with the transaction. Short-term securities sold under agreements to repurchase generally mature within one
Share-Based Compensation	Share-Based Compensation Compensation cost is recognized for stock options, stock appreciation rights, and restricted stock awards and units issued to employees based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options and appreciation rights, while the market price of our Common Stock at the date of grant is used for restricted stock awards. The market price of our Common Stock at the date of grant less the present value of dividends expected to be paid during the performance period is used for restricted stock units where the performance measure is based on an internal performance measure. A third-party provider is used to value certain restricted stock units where the performance measure is based on total shareholder return. Compensation expense is recognized over the required service period. Forfeitures are recognized as they occur.
Income Taxes	Income Taxes Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. We recognize a tax position as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. We recognize interest and/or penalties related to income tax matters in income tax expense. Old National is a limited partner in several tax-advantaged limited partnerships whose purpose is to invest in approved qualified affordable housing, renewable energy, or other renovation or community revitalization projects. These investments are included in other assets on the balance sheet, with any unfunded commitments included with other liabilities. Certain of these assets qualify for the proportional amortization method and are amortized over the period that Old National expects to receive the tax credits, with the expense included within income tax expense on the consolidated statements of income. The other investments are accounted for under the equity method, with the expense included within noninterest expense on the consolidated statements of income. All of our tax credit investments are evaluated for impairment at the end of each reporting period.
Loss Contingencies	Loss Contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. See Note 20 to the consolidated financial statements for further disclosure.
Cash Equivalents and Cash Flows	Cash Equivalents and Cash Flows For the purpose of presentation in the accompanying consolidated statement of cash flows, cash and cash equivalents are defined as cash, due from banks, federal funds sold and resell agreements, and money market investments, which have maturities less than 90 days. Cash flows from loans, either originated or acquired, are classified at that time according to management’s intent to either sell or hold the loan for the foreseeable future. When management’s intent is to sell the loan, the cash flows of that loan are presented as operating cash flows. When management’s intent is to hold the loan for the foreseeable future, the cash flows of that loan are presented as investing cash flows. The following table summarizes supplemental cash flow information: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash payments: Interest $ 666,121 $ 118,165 $ 42,196 Income taxes, net of refunds 190,303 66,109 31,875 Noncash Investing and Financing Activities: Securities transferred from available-for-sale to held-to-maturity — 2,986,736 — Transfer of premises and equipment to assets held-for-sale — 7,905 9,539 Operating lease right-of-use assets obtained in exchange for lease obligations 20,260 28,265 776 Finance lease right-of-use assets obtained in exchange for lease obligations 10,019 (966) 7,477 There were 129.4 million shares of Common Stock issued in conjunction with the merger with First Midwest in February of 2022 totaling $2.4 billion in shareholders’ equity . In addition, Old National issued 108,000 shares of Old National Series A Preferred Stock and 122,500 shares of Old National Series C Preferred Stock totaling $243.7 million in shareholders’ equity.
Business Combinations	Business Combinations Old National accounts for business combinations using the acquisition method of accounting. The accounts of an acquired entity are included as of the date of merger or acquisition, and any excess of purchase price over the fair value of the net assets acquired is capitalized as goodwill. Alternatively, a gain is recorded if the fair value of the net assets acquired exceeds the purchase price. Old National typically issues Common Stock and/or pays cash for a merger or acquisition, depending on the terms of the agreement. The value of Common Stock issued is determined based on the market price of the stock as of the closing of the merger or acquisition. Merger and acquisition costs are expensed when incurred.
Revenue From Contracts with Customers	Revenue From Contracts With Customers Old National’s revenue from contracts with customers in the scope of ASC 606 is recognized within noninterest income. A description of the Company’s significant revenue streams accounted for under ASC 606 follows: Wealth and investment services fees : Old National earns wealth management fees based upon asset custody and investment management services provided to individual and institutional customers. Most of these customers receive monthly or quarterly billings for services rendered based upon the market value of assets in custody. Fees that are transaction based are recognized at the point in time that the transaction is executed. Investment product fees are the commissions and fees received from third-party registered broker/dealers and investment advisers that provide those services to Old National customers. Old National acts as an agent in arranging the relationship between the customer and the third-party service provider. These fees are recognized monthly from the third-party broker based upon services already performed, net of the processing fees charged to Old National by the broker. Service charges on deposit accounts : Old National earns fees from deposit customers for transaction-based, account maintenance, and overdraft services. Transaction-based fees and overdraft fees are recognized at a point in time, since the customer generally has a right to cancel the depository arrangement at any time. The arrangement is considered a day-to-day contract with ongoing renewals and optional purchases, so the duration of the contract does not extend beyond the services already performed. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which Old National satisfies its performance obligation. Debit card and ATM fees : Debit card and ATM fees include ATM usage fees and debit card interchange income. As with the transaction-based fees on deposit accounts, the ATM fees are recognized at the point in time that Old National fulfills the customer’s request. Old National earns interchange fees from cardholder transactions processed through card association networks. Interchange rates are generally set by the card associations based upon purchase volumes and other factors. Interchange fees represent a percentage of the underlying transaction value and are recognized daily, concurrently with the transaction processing services provided to the cardholder.
Impact of Accounting Changes	Impact of Accounting Changes Accounting Guidance Adopted in 2023 FASB ASC 805 – In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities From Contracts With Customers , to address diversity in practice and inconsistency related to the accounting for revenue contracts with customers acquired in a business combination. The amendments require that the acquirer recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. At the acquisition date, an acquirer should account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The ASU also provides certain practical expedients for acquirers when recognizing and measuring acquired contract assets and liabilities. The amendments in this update are effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. Entities should apply the amendments prospectively to business combinations that occur after the effective date. The adoption of this guidance on January 1, 2023 did not have a material impact on the consolidated financial statements. FASB ASC 815 – In March 2022, the FASB issued ASU 2022-01, Derivatives and Hedging (Topic 815): Fair Value Hedging—Portfolio Layer Method , to expand the current single-layer method of electing hedge accounting to allow multiple hedged layers of a single closed portfolio under the method and rename the last-of-layer method the portfolio layer method. The amendments in this update are effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. The adoption of this guidance on January 1, 2023 did not have a material impact on the consolidated financial statements. FASB ASC 326 – In March 2022, the FASB issued ASU 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures , to eliminate the TDR recognition and measurement guidance and, instead, require that an entity evaluate (consistent with the accounting for other loan modifications) whether the modification represents a new loan or a continuation of an existing loan. The amendments also enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulty. The amendments require that an entity disclose current-period gross charge-offs by year of origination for financing receivables and net investment in leases within the vintage disclosures required by ASC 326. The amendments in this update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The adoption of the provision in ASU 2022-02 related to the recognition and measurement of TDRs on a prospective basis on January 1, 2023 did not have a material impact on the consolidated financial statements. FASB ASC 848 – In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting , which provides temporary, optional guidance to ease the potential burden in accounting for, or recognizing the effects of, the transition away from LIBOR or other interbank offered rate on financial reporting. The guidance is applicable only to contracts or hedge accounting relationships that reference LIBOR or another reference rate expected to be discontinued. In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 , which defers the sunset date of relief provisions within Topic 848 from December 31, 2022 to December 31, 2024. The objective of the guidance in Topic 848 is to provide relief during the transition period. The amendments in this ASU are effective March 12, 2020 through December 31, 2024. As of December 31, 2023, substantially all of the Company’s LIBOR exposure was remediated and remaining LIBOR-based contracts are expected to transition to alternate reference rates at their next index reset dates. Old National believes the adoption of this guidance on activities subsequent to December 31, 2023 will not have a material impact on the consolidated financial statements. Accounting Guidance Pending Adoption FASB ASC 820 – In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions , to clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. Early adoption is permitted. Old National does not expect the adoption of this guidance will have a material impact on the consolidated financial statements. FASB ASC 323 – In March 2023, the FASB issued ASU 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 to elect to account for qualifying tax equity investments using the proportional amortization method, regardless of the program giving rise to the related income tax credits. This ASU is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted for all entities in any interim period. Old National does not expect the adoption of this guidance will have a material impact on the consolidated financial statements. FASB ASC 280 – In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. The amendments are intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. In addition, the amendments enhance interim disclosure requirements, clarify circumstances in which an entity can disclose multiple segment measures of profit or loss, provide new segment disclosure requirements for entities with a single reportable segment, and contain other disclosure requirements. The purpose of the amendments is to enable investors to better understand an entity’s overall performance and assess potential future cash flows. A public entity should apply the amendments retrospectively to all prior periods presented in the financial statements. Upon transition, the segment expense categories and amounts disclosed in the prior periods should be based on the significant segment expense categories identified and disclosed in the period of adoption. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. Old National is currently evaluating the impact of adopting the new guidance on the consolidated financial statements. FASB ASC 740 – In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . Among other things, these amendments require that public business entities on an annual basis disclose additional information in specified categories with respect to the reconciliation of the effective tax rate to the statutory rate for federal, state, and foreign income taxes. It also requires greater detail about individual reconciling items in the rate reconciliation to the extent the impact of those items exceeds a quantitative threshold (if the effect of those reconciling items is equal to or greater than 5 percent of the amount computed by multiplying pretax income (loss) by the applicable statutory income tax rate). In addition, the ASU requires information pertaining to taxes paid (net of refunds received) to be disaggregated for federal, state, and foreign taxes and further disaggregated for specific jurisdictions to the extent the related amounts are equal to or greater than 5 percent of total income taxes paid (net of refunds received). The amendments in this ASU are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. Old National is currently evaluating the impact of adopting the new guidance on the consolidated financial statements.

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Supplemental Cash Flow Information	The following table summarizes supplemental cash flow information: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash payments: Interest $ 666,121 $ 118,165 $ 42,196 Income taxes, net of refunds 190,303 66,109 31,875 Noncash Investing and Financing Activities: Securities transferred from available-for-sale to held-to-maturity — 2,986,736 — Transfer of premises and equipment to assets held-for-sale — 7,905 9,539 Operating lease right-of-use assets obtained in exchange for lease obligations 20,260 28,265 776 Finance lease right-of-use assets obtained in exchange for lease obligations 10,019 (966) 7,477

Merger, Acquisition, and Dive_2

Merger, Acquisition, and Divestiture Activity (Tables)	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Summary of Business Acquisition	The following table presents a summary of the assets acquired and liabilities assumed, net of the fair value adjustments and the fair value of consideration as of the merger date: (dollars and shares in thousands) February 15, Assets Cash and cash equivalents $ 1,912,629 Investment securities 3,526,278 FHLB/Federal Reserve Bank stock 106,097 Loans held-for-sale 13,809 Loans, net of allowance for credit losses 14,298,873 Premises and equipment 111,867 Operating lease right-of-use assets 129,698 Accrued interest receivable 53,502 Goodwill 961,722 Other intangible assets 117,584 Company-owned life insurance 301,025 Other assets 317,258 Total assets $ 21,850,342 Liabilities Deposits $ 17,249,404 Securities sold under agreements to repurchase 135,194 Federal Home Loan Bank advances 1,158,623 Other borrowings 274,569 Accrued expenses and other liabilities 342,369 Total liabilities $ 19,160,159 Fair value of consideration Preferred stock $ 243,870 Common stock (129,365 shares issued at $18.92 per share) 2,446,312 Total consideration $ 2,690,182

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities Portfolio	The following table summarizes the amortized cost and fair value of the available-for-sale and held-to-maturity investment securities portfolios and the corresponding amounts of gross unrealized gains, unrealized losses, and basis adjustments in AOCI and gross unrecognized gains and losses. (dollars in thousands) Amortized Unrealized Unrealized Basis Adjustments (1) Fair December 31, 2023 Available-for-Sale U.S. Treasury $ 449,817 $ 154 $ (11,941) $ (41,297) $ 396,733 U.S. government-sponsored entities and agencies 1,487,879 33 (192,717) (63,931) 1,231,264 Mortgage-backed securities - Agency 4,835,319 3,093 (621,852) — 4,216,560 States and political subdivisions 554,509 878 (23,057) 2,930 535,260 Pooled trust preferred securities 13,797 — (2,460) — 11,337 Other securities 343,568 449 (22,116) — 321,901 Total available-for-sale securities $ 7,684,889 $ 4,607 $ (874,143) $ (102,298) $ 6,713,055 Held-to-Maturity U.S. government-sponsored entities and agencies $ 825,953 $ — $ (154,827) $ — $ 671,126 Mortgage-backed securities - Agency 1,029,131 — (147,137) — 881,994 States and political subdivisions 1,158,559 1,800 (112,141) — 1,048,218 Allowance for securities held-to-maturity (150) — — — (150) Total held-to-maturity securities $ 3,013,493 $ 1,800 $ (414,105) $ — $ 2,601,188 December 31, 2022 Available-for-Sale U.S. Treasury $ 253,148 $ 5 $ (5,189) $ (47,037) $ 200,927 U.S. government-sponsored entities and agencies 1,451,736 — (169,248) (107,408) 1,175,080 Mortgage-backed securities - Agency 4,986,354 976 (617,428) — 4,369,902 States and political subdivisions 688,159 1,789 (26,096) — 663,852 Pooled trust preferred securities 13,783 — (2,972) — 10,811 Other securities 379,423 258 (26,541) — 353,140 Total available-for-sale securities $ 7,772,603 $ 3,028 $ (847,474) $ (154,445) $ 6,773,712 Held-to-Maturity U.S. government-sponsored entities and agencies $ 819,168 $ — $ (162,810) $ — $ 656,358 Mortgage-backed securities - Agency 1,106,817 — (123,854) — 982,963 States and political subdivisions 1,163,312 221 (159,022) — 1,004,511 Allowance for securities held-to-maturity (150) — — — (150) Total held-to-maturity securities $ 3,089,147 $ 221 $ (445,686) $ — $ 2,643,682 (1) Basis adjustments represent the amount of fair value hedging adjustments included in the carrying amounts of fixed-rate investment securities assets designated in fair value hedging arrangements. See Note 19 to the consolidated financial statements for additional information regarding these derivative financial instruments.
Schedule of Proceeds from Sales or Calls and Realized Gain and Losses of Available-for-Sale Investment Securities and Other Securities	Proceeds from sales or calls of available-for-sale investment securities and the resulting realized gains and realized losses were as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Proceeds $ 154,339 $ 90,840 $ 357,704 Realized gains 1,006 531 4,505 Realized losses (7,271) (619) (178)
Schedule of Expected Maturities of Investment Securities Portfolio	Weighted average yield is based on amortized cost. At December 31, 2023 (dollars in thousands) Amortized Fair Weighted Maturity Available-for-Sale Within one year $ 378,992 $ 375,976 4.37 % One to five years 1,875,152 1,736,452 3.14 % Five to ten years 3,944,940 3,408,082 2.39 % Beyond ten years 1,485,805 1,192,545 2.60 % Total $ 7,684,889 $ 6,713,055 2.71 % Held-to-Maturity One to five years $ 161,440 $ 134,333 2.65 % Five to ten years 1,183,893 1,040,925 2.66 % Beyond ten years 1,668,160 1,425,930 2.72 % Total $ 3,013,493 $ 2,601,188 2.69 %
Schedule of Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position	The following table summarizes the available-for-sale investment securities with unrealized losses for which an allowance for credit losses has not been recorded by aggregated major security type and length of time in a continuous unrealized loss position: Less than 12 months 12 months or longer Total (dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Losses December 31, 2023 Available-for-Sale U.S. Treasury $ 8,937 $ (42) $ 191,027 $ (11,899) $ 199,964 $ (11,941) U.S. government-sponsored entities — — 1,189,314 (192,717) 1,189,314 (192,717) Mortgage-backed securities - Agency 90,145 (710) 3,835,552 (621,142) 3,925,697 (621,852) States and political subdivisions 86,865 (495) 259,767 (22,562) 346,632 (23,057) Pooled trust preferred securities — — 11,337 (2,460) 11,337 (2,460) Other securities 39,032 (229) 255,888 (21,887) 294,920 (22,116) Total available-for-sale $ 224,979 $ (1,476) $ 5,742,885 $ (872,667) $ 5,967,864 $ (874,143) December 31, 2022 Available-for-Sale U.S. Treasury $ 130,967 $ (3,264) $ 66,992 $ (1,925) $ 197,959 $ (5,189) U.S. government-sponsored entities 454,854 (75,795) 720,226 (93,453) 1,175,080 (169,248) Mortgage-backed securities - Agency 3,207,319 (358,507) 1,116,205 (258,921) 4,323,524 (617,428) States and political subdivisions 414,813 (25,555) 2,703 (541) 417,516 (26,096) Pooled trust preferred securities — — 10,811 (2,972) 10,811 (2,972) Other securities 257,775 (17,045) 75,309 (9,496) 333,084 (26,541) Total available-for-sale $ 4,465,728 $ (480,166) $ 1,992,246 $ (367,308) $ 6,457,974 $ (847,474)
Schedule of Held-to-Maturity Investment Securities with Unrecognized Losses	The following table summarizes the held-to-maturity investment securities with unrecognized losses aggregated by major security type and length of time in a continuous loss position: Less than 12 months 12 months or longer Total (dollars in thousands) Fair Unrecognized Fair Unrecognized Fair Unrecognized December 31, 2023 Held-to-Maturity U.S. government-sponsored entities $ — $ — $ 671,126 $ (154,827) $ 671,126 $ (154,827) Mortgage-backed securities - Agency — — 881,994 (147,137) 881,994 (147,137) States and political subdivisions — — 977,154 (112,141) 977,154 (112,141) Total held-to-maturity $ — $ — $ 2,530,274 $ (414,105) $ 2,530,274 $ (414,105) December 31, 2022 Held-to-Maturity U.S. government-sponsored entities $ 354,293 $ (110,523) $ 302,066 $ (52,287) $ 656,359 $ (162,810) Mortgage-backed securities - Agency 367,849 (42,438) 615,114 (81,416) 982,963 (123,854) States and political subdivisions 838,689 (127,355) 135,573 (31,667) 974,262 (159,022) Total held-to-maturity $ 1,560,831 $ (280,316) $ 1,052,753 $ (165,370) $ 2,613,584 $ (445,686)

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Schedule of Composition of Loans and Impact of Adoption	The portfolio segment reclassifications follow: Balance Sheet Portfolio Portfolio (dollars in thousands) December 31, 2023 Commercial (1) $ 9,512,230 $ (232,764) $ 9,279,466 Commercial real estate 14,140,629 (169,058) 13,971,571 BBCC N/A 401,822 401,822 Residential real estate 6,699,443 — 6,699,443 Consumer 2,639,625 (2,639,625) N/A Indirect N/A 1,050,982 1,050,982 Direct N/A 523,172 523,172 Home equity N/A 1,065,471 1,065,471 Total loans (2) 32,991,927 — 32,991,927 Allowance for credit losses on loans (307,610) — (307,610) Net loans $ 32,684,317 $ — $ 32,684,317 December 31, 2022 Commercial (1) $ 9,508,904 $ (210,280) $ 9,298,624 Commercial real estate 12,457,070 (158,322) 12,298,748 BBCC N/A 368,602 368,602 Residential real estate 6,460,441 — 6,460,441 Consumer 2,697,226 (2,697,226) N/A Indirect N/A 1,034,257 1,034,257 Direct N/A 629,186 629,186 Home equity N/A 1,033,783 1,033,783 Total loans (2) 31,123,641 — 31,123,641 Allowance for credit losses on loans (303,671) — (303,671) Net loans $ 30,819,970 $ — $ 30,819,970 (1) Includes direct finance leases of $169.7 million at December 31, 2023 and $188.1 million at December 31, 2022. (2) Includes unearned income of $93.7 million at December 31, 2023 and $126.7 million at December 31, 2022.
Schedule of Activity in Allowance for Loan Losses	Old National’s activity in the allowance for credit losses on loans by portfolio segment was as follows: (dollars in thousands) Balance at Allowance Charge-offs Recoveries Provision Balance at Year Ended December 31, 2023 Commercial $ 120,612 $ — $ (41,451) $ 4,172 $ 35,000 $ 118,333 Commercial real estate 138,244 — (11,198) 2,417 25,636 155,099 BBCC 2,431 — (1,650) 275 1,831 2,887 Residential real estate 21,916 — (256) 1,268 (2,091) 20,837 Indirect 1,532 — (2,948) 1,559 1,093 1,236 Direct 12,116 — (10,517) 2,331 (761) 3,169 Home equity 6,820 — (443) 531 (859) 6,049 Total $ 303,671 $ — $ (68,463) $ 12,553 $ 59,849 $ 307,610 Year Ended December 31, 2022 Commercial $ 27,232 $ 38,780 $ (6,885) $ 4,610 $ 56,875 $ 120,612 Commercial real estate 64,004 49,419 (6,519) 1,095 30,245 138,244 BBCC 2,458 — (85) 281 (223) 2,431 Residential real estate 9,347 136 (344) 760 12,017 21,916 Indirect 1,743 — (2,525) 1,263 1,051 1,532 Direct 528 31 (10,799) 2,557 19,799 12,116 Home equity 2,029 723 (124) 616 3,576 6,820 Total $ 107,341 $ 89,089 $ (27,281) $ 11,182 $ 123,340 $ 303,671 Year Ended December 31, 2021 Commercial $ 30,567 $ — $ (1,228) $ 791 $ (2,898) $ 27,232 Commercial real estate 75,810 — (264) 4,403 (15,945) 64,004 BBCC 6,120 — (144) 105 (3,623) 2,458 Residential real estate 12,608 — (346) 339 (3,254) 9,347 Indirect 3,580 — (1,087) 1,682 (2,432) 1,743 Direct 855 — (1,159) 777 55 528 Home equity 1,848 — (82) 978 (715) 2,029 Total $ 131,388 $ — $ (4,310) $ 9,075 $ (28,812) $ 107,341 Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 32,188 $ 10,879 $ 11,689 Provision for credit losses on unfunded loan commitments — 11,013 — Provision (release) for credit losses on unfunded loan (962) 10,296 (810) Balance at end of period $ 31,226 $ 32,188 $ 10,879
Schedule of Risk Category of Commercial and Commercial Real Estate Loans	The following table summarizes the amortized cost of term loans by risk category of commercial, commercial real estate, and BBCC loans by loan portfolio segment, class of loan, and origination year: Origination Year Revolving to Term (dollars in 2023 2022 2021 2020 2019 Prior Revolving Total December 31, 2023 Commercial: Risk Rating: Pass $ 1,826,289 $ 1,573,669 $ 985,964 $ 520,883 $ 450,911 $ 495,979 $ 2,051,985 $ 651,953 $ 8,557,633 Criticized 20,038 90,031 19,953 36,906 25,756 47,357 89,765 44,348 374,154 Classified: Substandard 27,271 41,164 27,990 37,618 10,461 29,981 72,703 56,716 303,904 Nonaccrual 32 7,034 — — 823 3,411 — 5,461 16,761 Doubtful — 7,261 5,925 4,875 1,742 7,211 — — 27,014 Total $ 1,873,630 $ 1,719,159 $ 1,039,832 $ 600,282 $ 489,693 $ 583,939 $ 2,214,453 $ 758,478 $ 9,279,466 Commercial real estate: Risk Rating: Pass $ 2,177,841 $ 3,515,702 $ 2,563,638 $ 1,576,044 $ 1,010,351 $ 1,161,119 $ 103,332 $ 960,386 $ 13,068,413 Criticized 69,648 69,946 68,708 27,059 52,107 95,896 3,893 64,730 451,987 Classified: Substandard 26,638 56,423 21,401 28,983 61,186 49,558 — 48,760 292,949 Nonaccrual — 21,919 10,706 1,975 1,634 8,632 — 1,400 46,266 Doubtful 5,360 429 30,897 2,306 37,777 35,187 — — 111,956 Total $ 2,279,487 $ 3,664,419 $ 2,695,350 $ 1,636,367 $ 1,163,055 $ 1,350,392 $ 107,225 $ 1,075,276 $ 13,971,571 BBCC: Risk Rating: Pass $ 81,102 $ 64,583 $ 44,307 $ 38,086 $ 27,557 $ 19,028 $ 68,807 $ 33,361 $ 376,831 Criticized — — 857 700 1,001 349 2,144 12,728 17,779 Classified: Substandard 436 193 252 — — 604 15 1,006 2,506 Nonaccrual — — 482 — 4 1,105 — 1,402 2,993 Doubtful 302 727 254 286 60 84 — — 1,713 Total $ 81,840 $ 65,503 $ 46,152 $ 39,072 $ 28,622 $ 21,170 $ 70,966 $ 48,497 $ 401,822 Origination Year Revolving to Term (dollars in thousands) 2022 2021 2020 2019 2018 Prior Revolving Total December 31, 2022 Commercial: Risk Rating: Pass $ 2,388,618 $ 1,754,364 $ 796,340 $ 738,208 $ 362,986 $ 388,617 $ 1,988,763 $ 329,119 $ 8,747,015 Criticized 40,856 30,661 63,557 33,490 9,195 5,312 61,036 4,327 248,434 Classified: Substandard 37,223 47,522 16,540 22,925 4,844 21,204 67,402 25,143 242,803 Nonaccrual 3,627 1,453 566 — — — 1,634 6,623 13,903 Doubtful 2,821 17,604 3,720 8,005 5,968 8,351 — — 46,469 Total $ 2,473,145 $ 1,851,604 $ 880,723 $ 802,628 $ 382,993 $ 423,484 $ 2,118,835 $ 365,212 $ 9,298,624 Commercial real estate: Risk Rating: Pass $ 3,066,960 $ 2,828,758 $ 1,989,000 $ 1,219,025 $ 675,572 $ 1,018,719 $ 57,818 $ 689,553 $ 11,545,405 Criticized 75,306 34,422 22,569 82,637 86,504 56,864 — 23,282 381,584 Classified: Substandard 46,231 16,928 24,319 78,468 57,824 21,591 — 4,108 249,469 Nonaccrual 3,151 9,541 5,014 — 2,312 22,155 — 3,257 45,430 Doubtful 1,934 38,386 10,011 4,605 1,523 20,401 — — 76,860 Total $ 3,193,582 $ 2,928,035 $ 2,050,913 $ 1,384,735 $ 823,735 $ 1,139,730 $ 57,818 $ 720,200 $ 12,298,748 BBCC: Risk Rating: Pass $ 90,341 $ 64,161 $ 52,304 $ 36,868 $ 23,618 $ 11,333 $ 60,016 $ 18,881 $ 357,522 Criticized 1,504 525 368 692 353 — 1,006 1,603 6,051 Classified: Substandard 811 143 — 421 — — 543 682 2,600 Nonaccrual 42 37 118 — 429 284 — 639 1,549 Doubtful 40 107 439 157 64 73 — — 880 Total $ 92,738 $ 64,973 $ 53,229 $ 38,138 $ 24,464 $ 11,690 $ 61,565 $ 21,805 $ 368,602 For residential real estate and consumer loan classes, Old National evaluates credit quality based on the aging status of the loan and by payment activity. The performing or nonperforming status is updated on an on-going basis dependent upon improvement and deterioration in credit quality. The following table presents the amortized cost of term residential real estate and consumer loans based on payment activity and origination year: Origination Year Revolving to Term (dollars in thousands) 2023 2022 2021 2020 2019 Prior Revolving Total December 31, 2023 Residential real estate: Performing $ 453,743 $ 1,508,671 $ 1,836,078 $ 1,705,131 $ 430,783 $ 722,987 $ — $ 279 $ 6,657,672 Nonperforming 116 4,563 4,004 3,375 4,078 25,635 — — 41,771 Total $ 453,859 $ 1,513,234 $ 1,840,082 $ 1,708,506 $ 434,861 $ 748,622 $ — $ 279 $ 6,699,443 Indirect: Performing $ 393,369 $ 355,822 $ 162,735 $ 82,871 $ 37,967 $ 13,815 $ — $ 196 $ 1,046,775 Nonperforming 372 1,472 1,207 547 318 291 — — 4,207 Total $ 393,741 $ 357,294 $ 163,942 $ 83,418 $ 38,285 $ 14,106 $ — $ 196 $ 1,050,982 Direct: Performing $ 109,372 $ 90,310 $ 92,491 $ 48,387 $ 29,659 $ 67,129 $ 75,080 $ 4,852 $ 517,280 Nonperforming 67 531 517 560 210 3,872 124 11 5,892 Total $ 109,439 $ 90,841 $ 93,008 $ 48,947 $ 29,869 $ 71,001 $ 75,204 $ 4,863 $ 523,172 Home equity: Performing $ 290 $ 164 $ 160 $ 140 $ 679 $ 4,483 $ 1,019,389 $ 23,918 $ 1,049,223 Nonperforming — 310 328 404 741 4,327 2,844 7,294 16,248 Total $ 290 $ 474 $ 488 $ 544 $ 1,420 $ 8,810 $ 1,022,233 $ 31,212 $ 1,065,471 Origination Year Revolving to Term 2022 2021 2020 2019 2018 Prior Revolving Total December 31, 2022 Residential real estate: Performing $ 1,327,168 $ 1,945,792 $ 1,825,762 $ 478,529 $ 136,260 $ 712,175 $ 7 $ 88 $ 6,425,781 Nonperforming 59 529 861 873 1,826 30,512 — — 34,660 Total $ 1,327,227 $ 1,946,321 $ 1,826,623 $ 479,402 $ 138,086 $ 742,687 $ 7 $ 88 $ 6,460,441 Indirect: Performing $ 504,410 $ 249,407 $ 144,265 $ 82,304 $ 31,484 $ 19,095 $ — $ 62 $ 1,031,027 Nonperforming 348 1,074 645 531 304 328 — — 3,230 Total $ 504,758 $ 250,481 $ 144,910 $ 82,835 $ 31,788 $ 19,423 $ — $ 62 $ 1,034,257 Direct: Performing $ 132,934 $ 164,126 $ 77,406 $ 57,919 $ 45,299 $ 59,212 $ 87,622 $ 671 $ 625,189 Nonperforming 115 851 614 205 327 1,526 5 354 3,997 Total $ 133,049 $ 164,977 $ 78,020 $ 58,124 $ 45,626 $ 60,738 $ 87,627 $ 1,025 $ 629,186 Home equity: Performing $ 919 $ 896 $ 1,849 $ 1,497 $ 983 $ 11,646 $ 990,001 $ 14,792 $ 1,022,583 Nonperforming 166 160 166 446 794 4,308 1,698 3,462 11,200 Total $ 1,085 $ 1,056 $ 2,015 $ 1,943 $ 1,777 $ 15,954 $ 991,699 $ 18,254 $ 1,033,783 The following table summarizes the gross charge-offs of loans by loan portfolio segment and origination year: Origination Year (dollars in thousands) 2023 2022 2021 2020 2019 Prior Revolving Total Year Ended December 31, 2023 Commercial $ — $ 6,475 $ 24,022 $ 120 $ 7,245 $ 2,880 $ 709 $ 41,451 Commercial real estate — 54 2,808 2,144 — 6,192 — 11,198 BBCC 670 548 362 70 — — — 1,650 Residential real estate — — — — — 256 — 256 Indirect 271 1,447 787 159 152 132 — 2,948 Direct 173 1,899 2,367 746 1,207 543 3,582 10,517 Home equity — — — 35 — 408 — 443 Total gross charge-offs $ 1,114 $ 10,423 $ 30,346 $ 3,274 $ 8,604 $ 10,411 $ 4,291 $ 68,463
Schedule of Past Due Financing Receivables	The following table presents the aging of the amortized cost basis in past due loans by class of loans: (dollars in thousands) 30-59 Days 60-89 Days Past Due Total Current Total December 31, 2023 Commercial $ 16,128 $ 1,332 $ 4,861 $ 22,321 $ 9,257,145 $ 9,279,466 Commercial real estate 9,081 5,254 30,660 44,995 13,926,576 13,971,571 BBCC 1,368 134 977 2,479 399,343 401,822 Residential 12,358 367 15,249 27,974 6,671,469 6,699,443 Indirect 7,025 1,854 1,342 10,221 1,040,761 1,050,982 Direct 5,436 1,455 1,787 8,678 514,494 523,172 Home equity 7,791 2,347 6,659 16,797 1,048,674 1,065,471 Total $ 59,187 $ 12,743 $ 61,535 $ 133,465 $ 32,858,462 $ 32,991,927 December 31, 2022 Commercial $ 14,147 $ 4,801 $ 11,080 $ 30,028 $ 9,268,596 $ 9,298,624 Commercial real estate 47,240 1,312 32,892 81,444 12,217,304 12,298,748 BBCC 730 365 603 1,698 366,904 368,602 Residential 24,181 5,033 11,753 40,967 6,419,474 6,460,441 Indirect 6,302 2,118 958 9,378 1,024,879 1,034,257 Direct 5,404 2,118 1,928 9,450 619,736 629,186 Home equity 6,585 1,966 4,707 13,258 1,020,525 1,033,783 Total $ 104,589 $ 17,713 $ 63,921 $ 186,223 $ 30,937,418 $ 31,123,641
Schedule of Financing Receivable, Nonaccrual	The following table presents the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: December 31, 2023 December 31, 2022 (dollars in thousands) Nonaccrual Nonaccrual Past Due Nonaccrual Nonaccrual Past Due Commercial $ 43,775 $ 13,143 $ 242 $ 60,372 $ 7,873 $ 152 Commercial real estate 158,222 24,507 585 122,290 33,445 — BBCC 4,706 — 95 2,429 — — Residential 41,771 — — 34,660 — 1,808 Indirect 4,207 — 8 3,230 — 28 Direct 5,892 — 31 3,997 — 133 Home equity 16,248 — — 11,200 — 529 Total $ 274,821 $ 37,650 $ 961 $ 238,178 $ 41,318 $ 2,650 Type of Collateral (dollars in thousands) Real Blanket Investment Auto Other December 31, 2023 Commercial $ 14,303 $ 24,729 $ 2,577 $ 280 $ 328 Commercial Real Estate 146,425 — 1,167 — 6,107 BBCC 3,522 794 — 390 — Residential 41,771 — — — — Indirect — — — 4,207 — Direct 4,727 1 3 366 29 Home equity 16,248 — — — — Total $ 226,996 $ 25,524 $ 3,747 $ 5,243 $ 6,464 December 31, 2022 Commercial $ 8,962 $ 42,754 $ 2,690 $ 1,611 $ 980 Commercial Real Estate 108,871 — 1,718 — 6,411 BBCC 1,939 478 — 12 — Residential 34,660 — — — — Indirect — — — 3,230 — Direct 2,991 13 — 232 23 Home equity 11,200 — — — — Total $ 168,623 $ 43,245 $ 4,408 $ 5,085 $ 7,414
Schedule of Activity in Trouble Debt Restructurings	The following table presents the amortized cost basis of financial difficulty modifications at December 31, 2023 that were modified during the year ended December 31, 2023 by class of loans and type of modification: (dollars in thousands) Term Total Year Ended December 31, 2023 Commercial $ 21,631 0.2 % Commercial real estate 121,529 0.9 % Total $ 143,160 0.4 % Old National monitors the performance of financial difficulty modifications to understand the effectiveness of its efforts. The following table presents the performance of loans identified as financial difficulty modifications at December 31, 2023: (dollars in thousands) 30-59 Days 60-89 Days Past Due Total Current Total December 31, 2023 Commercial $ — $ — $ — $ — $ 21,631 $ 21,631 Commercial real estate 5,287 — — 5,287 116,242 121,529 Total $ 5,287 $ — $ — $ 5,287 $ 137,873 $ 143,160 The following table summarizes the nature of the financial difficulty modifications during the year ended December 31, 2023 by class of loans: (dollars in thousands) Weighted- Year Ended December 31, 2023 Commercial 6.1 Commercial real estate 8.6 Total 8.2

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	The composition of premises and equipment was as follows: December 31, (dollars in thousands) 2023 2022 Land $ 91,568 $ 91,568 Buildings 453,234 419,596 Furniture, fixtures, and equipment 148,134 154,719 Leasehold improvements 85,187 69,412 Total 778,123 735,295 Accumulated depreciation (212,727) (177,988) Premises and equipment, net $ 565,396 $ 557,307

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Lessee Disclosure [Abstract]
Schedule of Components of Lease Expense	The components of lease expense were as follows: Affected Line Years Ended December 31, (dollars in thousands) 2023 2022 2021 Operating lease cost Occupancy/Equipment expense $ 31,175 $ 29,368 $ 12,336 Finance lease cost: Amortization of right-of-use assets Occupancy expense 2,921 2,672 2,356 Interest on lease liabilities Interest expense 722 415 431 Sub-lease income Occupancy expense (387) (448) (438) Total $ 34,431 $ 32,007 $ 14,685
Schedule of Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: December 31, (dollars in thousands) 2023 2022 Operating Leases Operating lease right-of-use assets $ 185,506 $ 189,714 Operating lease liabilities 204,960 211,964 Finance Leases Premises and equipment, net 19,820 10,799 Other borrowings 20,955 13,469 Weighted-Average Remaining Lease Term (in Years) Operating leases 8.5 9.1 Finance leases 10.5 7.2 Weighted-Average Discount Rate Operating leases 3.04 % 2.88 % Finance leases 3.90 % 3.30 %
Schedule of Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases was as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 31,720 $ 30,340 $ 13,823 Operating cash flows from finance leases 722 415 431 Financing cash flows from finance leases 2,533 2,475 2,057
Schedule of Maturity Analysis of Lease Liability by Lease Classification	The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2023: (dollars in thousands) Operating Finance 2024 $ 31,199 $ 3,357 2025 30,703 3,380 2026 29,972 2,154 2027 29,038 2,158 2028 25,392 2,056 Thereafter 87,940 12,752 Total undiscounted lease payments 234,244 25,857 Amounts representing interest (29,284) (4,902) Lease liability $ 204,960 $ 20,955

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The following table presents the changes in the carrying amount of goodwill: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 1,998,716 $ 1,036,994 $ 1,036,994 Acquisitions and adjustments — 961,722 — Balance at end of period $ 1,998,716 $ 1,998,716 $ 1,036,994
Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets	The gross carrying amounts and accumulated amortization of other intangible assets were as follows: (dollars in thousands) Gross Accumulated Net December 31, 2023 Core deposit $ 143,511 $ (72,940) $ 70,571 Customer trust relationships 52,621 (20,942) 31,679 Total intangible assets $ 196,132 $ (93,882) $ 102,250 December 31, 2022 Core deposit $ 170,642 $ (80,951) $ 89,691 Customer trust relationships 56,243 (19,529) 36,714 Total intangible assets $ 226,885 $ (100,480) $ 126,405
Schedule of Estimated Amortization Expense for Future Years	Estimated amortization expense for future years is as follows: (dollars in thousands) 2024 $ 21,239 2025 18,358 2026 15,555 2027 12,867 2028 10,356 Thereafter 23,875 Total $ 102,250

Loan Servicing Rights (Tables)

Loan Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2023
Transfers and Servicing [Abstract]
Schedule of Components of Loan Servicing Rights and Valuation Allowance	The following table summarizes the carrying values and activity related to loan servicing rights and the related valuation allowance: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 37,267 $ 30,085 $ 28,124 Additions (1) 3,657 13,080 11,759 Amortization (5,135) (5,898) (9,798) Balance before valuation allowance at end of period 35,789 37,267 30,085 Valuation allowance: Balance at beginning of period — (46) (1,407) (Additions)/recoveries — 46 1,361 Balance at end of period — — (46) Loan servicing rights, net $ 35,789 $ 37,267 $ 30,039 (1) Additions in 2022 included loan servicing rights of $7.7 million acquired in the First Midwest merger on February 15, 2022.

Qualified Affordable Housing _2

Qualified Affordable Housing Projects and Other Tax Credit Investments (Tables)	12 Months Ended
	Dec. 31, 2023
Investments in Affordable Housing Projects [Abstract]
Schedule of Qualified Affordable Housing Projects and Other Tax Credit Investments	The following table summarizes Old National’s investments in qualified affordable housing projects and other tax credit investments: (dollars in thousands) December 31, 2023 December 31, 2022 Investment Accounting Method Investment Unfunded Commitment (1) Investment Unfunded Commitment LIHTC Proportional amortization $ 114,991 $ 75,981 $ 84,428 $ 55,754 FHTC Equity 34,220 27,421 19,316 9,588 NMTC Consolidation 47,727 — 51,912 — Renewable Energy Equity 201 — 1,099 — Total $ 197,139 $ 103,402 $ 156,755 $ 65,342 (1) All commitments will be paid by Old National by December 31, 2027. The following table summarizes the amortization expense and tax benefit recognized for Old National’s qualified affordable housing projects and other tax credit investments: (dollars in thousands) Amortization Expense (1) Tax Expense (Benefit) Recognized (2) Year Ended December 31, 2023 LIHTC $ 9,343 $ (10,980) FHTC 5,487 (6,186) NMTC 8,982 (11,195) Renewable Energy 898 — Total $ 24,710 $ (28,361) Year Ended December 31, 2022 LIHTC $ 4,974 $ (6,613) FHTC 1,925 (2,227) NMTC 8,197 (10,225) Renewable Energy 839 — Total $ 15,935 $ (19,065) Year Ended December 31, 2021 LIHTC $ 3,450 $ (4,543) FHTC 2,557 (2,884) NMTC 2,887 (3,625) Renewable Energy 1,326 (562) Total $ 10,220 $ (11,614) (1) The amortization expense for the LIHTC investments is included in our income tax expense. The amortization expense for the FHTC, NMTC, and Renewable Energy tax credits is included in noninterest expense. (2) All of the tax benefits recognized are included in our income tax expense. The tax benefit recognized for the FHTC, NMTC, and Renewable Energy investments primarily reflects the tax credits generated from the investments and excludes the net tax expense (benefit) and deferred tax liability of the investments’ income (loss).

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
Deposits [Abstract]
Schedule of Maturities of Total Time Deposits	At December 31, 2023, the scheduled maturities of total time deposits were as follows: (dollars in thousands) Due in 2024 $ 5,081,013 Due in 2025 376,189 Due in 2026 66,853 Due in 2027 33,864 Due in 2028 14,416 Thereafter 6,809 Total $ 5,579,144

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2023
Securities Sold under Agreements to Repurchase [Abstract]
Schedule Of Securities Sold Under Agreements To Repurchase And Weighted Average Interest Rates	The following table presents securities sold under agreements to repurchase and related weighted-average interest rates for each of the years ended December 31: (dollars in thousands) 2023 2022 Outstanding at year-end $ 285,206 $ 432,804 Average amount outstanding 332,853 440,619 Maximum amount outstanding at any month-end 430,537 509,275 Weighted-average interest rate: During year 0.99 % 0.19 % End of year 3.64 1.31
Schedule Of Remaining Contractual Maturity Of Secured Borrowings And Class Of Collateral Pledged Under Repurchase Agreements	The following table presents the contractual maturity of our secured borrowings and class of collateral pledged: At December 31, 2023 Remaining Contractual Maturity of the Agreements (dollars in thousands) Overnight and Up to 30-90 Days Greater Than Total Repurchase Agreements: U.S. Treasury and agency securities $ 285,206 $ — $ — $ — $ 285,206 Total $ 285,206 $ — $ — $ — $ 285,206

Federal Home Loan Bank Advanc_2

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2023
Advance from Federal Home Loan Bank [Abstract]
Summary of FHLB Advances	The following table summarizes Old National Bank’s FHLB advances: December 31, (dollars in thousands) 2023 2022 FHLB advances (fixed rates 2.19% to 5.51% and variable rates 5.34% to 5.36%) maturing January 2024 to December 2043 $ 4,300,528 $ 3,850,677 Fair value hedge basis adjustments and unamortized (19,847) (21,659) Total other borrowings $ 4,280,681 $ 3,829,018
Summary of Contractual Maturities of FHLB Advances	Contractual maturities of FHLB advances at December 31, 2023 were as follows: (dollars in thousands) Due in 2024 $ 125,243 Due in 2025 550,285 Due in 2026 100,000 Due in 2028 850,000 Thereafter 2,675,000 Fair value hedge basis adjustments and unamortized prepayment fees (19,847) Total $ 4,280,681

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Summary of Other Borrowings	The following table summarizes Old National’s other borrowings: December 31, (dollars in thousands) 2023 2022 Old National Bancorp: Senior unsecured notes (fixed rate 4.125%) maturing August 2024 $ 175,000 $ 175,000 Unamortized debt issuance costs related to senior unsecured notes (91) (247) Subordinated debentures (fixed rate 5.875%) maturing September 2026 150,000 150,000 Junior subordinated debentures (rates of 6.95% to 9.22%) maturing July 2031 to September 2037 136,643 136,643 Other basis adjustments 18,207 23,363 Old National Bank: Finance lease liabilities 20,955 13,469 Subordinated debentures (3-month SOFR plus 4.618%; variable rate 10.01%) maturing October 2025 12,000 12,000 Leveraged loans for NMTC (fixed rates of 1.00% to 1.43%) maturing December 2046 to June 2060 154,284 143,187 Other (1) 97,872 89,588 Total other borrowings $ 764,870 $ 743,003 (1) Includes overnight borrowings to collateralize certain derivative positions totaling $97.6 million at December 31, 2023 and $88.0 million at December 31, 2022. The following table summarizes the terms of our outstanding junior subordinated debentures as of December 31, 2023: (dollars in thousands) Name of Trust Issuance Date Issuance Rate Rate at December 31, Maturity Date Bridgeview Statutory Trust I July 2001 $ 15,464 3-month SOFR plus 3.58% 9.22 % July 31, 2031 Bridgeview Capital Trust II December 2002 15,464 3-month SOFR plus 3.35% 9.01 % January 7, 2033 First Midwest Capital Trust I November 2003 37,825 6.95% fixed 6.95 % December 1, 2033 St. Joseph Capital Trust II March 2005 5,155 3-month SOFR plus 1.75% 7.39 % March 17, 2035 Northern States Statutory Trust I September 2005 10,310 3-month SOFR plus 1.80% 7.45 % September 15, 2035 Anchor Capital Trust III August 2005 5,000 3-month SOFR plus 1.55% 7.14 % September 30, 2035 Great Lakes Statutory Trust II December 2005 6,186 3-month SOFR plus 1.40% 7.05 % December 15, 2035 Home Federal Statutory September 2006 15,464 3-month SOFR plus 1.65% 7.30 % September 15, 2036 Monroe Bancorp Capital July 2006 3,093 3-month SOFR plus 1.60% 7.26 % October 7, 2036 Tower Capital Trust 3 December 2006 9,279 3-month SOFR plus 1.69% 7.33 % March 1, 2037 Monroe Bancorp Statutory March 2007 5,155 3-month SOFR plus 1.60% 7.25 % June 15, 2037 Great Lakes Statutory Trust III June 2007 8,248 3-month SOFR plus 1.70% 7.35 % September 15, 2037 Total $ 136,643 The following table summarizes Old National Bank’s unfunded loan commitments and standby letters of credit: December 31, (dollars in thousands) 2023 2022 Unfunded loan commitments $ 8,912,587 $ 8,979,334 Standby letters of credit (1) 192,237 174,070 (1) Notional amount, which represents the maximum amount of future funding requirements. The carrying value was $1.3 million at December 31, 2023 and $0.8 million at December 31, 2022.
Summary of Contractual Maturities of Other Borrowings	Contractual maturities of other borrowings at December 31, 2023 were as follows: (dollars in thousands) Due in 2024 $ 275,263 Due in 2025 14,740 Due in 2026 151,576 Due in 2027 1,636 Due in 2028 1,594 Thereafter 301,683 Unamortized debt issuance costs and other basis adjustments 18,378 Total $ 764,870

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of AOCI	The following table summarizes the changes within each classification of AOCI, net of tax: (dollars in thousands) Unrealized Unrealized Gains and Defined Total Year Ended December 31, 2023 Balance at beginning of period $ (642,346) $ (112,664) $ (31,549) $ 137 $ (786,422) Other comprehensive income (loss) before (14,817) 1,325 51,871 — 38,379 Amounts reclassified from AOCI to income (1) 4,645 15,867 (11,141) (137) 9,234 Balance at end of period $ (652,518) $ (95,472) $ 9,181 $ — $ (738,809) Year Ended December 31, 2022 Balance at beginning of period $ (2,950) $ — $ 543 $ 32 $ (2,375) Other comprehensive income (loss) before (639,463) (125,229) (34,043) — (798,735) Amounts reclassified from AOCI to income (1) 67 12,565 1,951 105 14,688 Balance at end of period $ (642,346) $ (112,664) $ (31,549) $ 137 $ (786,422) Year Ended December 31, 2021 Balance at beginning of period $ 145,335 $ — $ 2,584 $ (148) $ 147,771 Other comprehensive income (loss) before (144,948) — 1,433 — (143,515) Amounts reclassified from AOCI to income (1) (3,337) — (3,474) 180 (6,631) Balance at end of period $ (2,950) $ — $ 543 $ 32 $ (2,375) (1) See table below for details about reclassifications to income.
Schedule of Reclassifications out of AOCI	The following table summarizes the significant amounts reclassified out of each component of AOCI: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Details about AOCI Components Amount Reclassified Affected Line Item in the Unrealized gains and losses on $ (6,265) $ (88) $ 4,327 Debt securities gains (losses), net 1,620 21 (990) Income tax (expense) benefit $ (4,645) $ (67) $ 3,337 Net income Amortization of unrealized losses on $ (21,239) $ (16,612) $ — Interest income (expense) 5,372 4,047 — Income tax (expense) benefit $ (15,867) $ (12,565) $ — Net income Gains and losses on hedges $ 15,067 $ (2,587) $ 4,605 Interest income (expense) (3,926) 636 (1,131) Income tax (expense) benefit $ 11,141 $ (1,951) $ 3,474 Net income Amortization of defined benefit Actuarial gains (losses) $ 182 $ (139) $ (239) Salaries and employee benefits (45) 34 59 Income tax (expense) benefit $ 137 $ (105) $ (180) Net income Total reclassifications for the period $ (9,234) $ (14,688) $ 6,631 Net income

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate	Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statement of income: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Provision at statutory rate of 21% $ 157,774 $ 114,394 $ 71,161 Tax-exempt income: Tax-exempt interest (18,582) (14,588) (11,066) Section 291/265 interest disallowance 2,392 363 114 Company-owned life insurance income (3,125) (2,891) (2,138) Tax-exempt income (19,315) (17,116) (13,090) State income taxes 31,164 20,837 9,308 Tax credit investments - federal (12,190) (9,140) (5,212) Officer compensation limitation 4,685 5,903 564 Non-deductible FDIC premiums 7,912 3,805 438 Other, net (720) (2,237) (1,845) Income tax expense $ 169,310 $ 116,446 $ 61,324 Effective tax rate 22.5 % 21.4 % 18.1 %
Schedule of Provision for Income Taxes	The provision for income taxes consisted of the following components: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Current expense: Federal $ 121,428 $ 106,918 $ 31,943 State 37,331 32,898 8,461 Deferred expense: Federal 7,941 (16,216) 17,514 State 2,610 (7,154) 3,406 Deferred income tax expense 10,551 (23,370) 20,920 Income tax expense $ 169,310 $ 116,446 $ 61,324
Schedule of Significant Components of Net Deferred Tax Assets (Liabilities)	Significant components of net deferred tax assets (liabilities) were as follows: December 31, (dollars in thousands) 2023 2022 Deferred Tax Assets Unrealized losses on available-for-sale investment securities $ 217,018 $ 202,101 Allowance for credit losses on loans, net of recapture 86,224 85,619 Operating lease liabilities 57,996 58,288 Unrealized losses on held-to-maturity investment securities 32,150 36,197 Acquired loans 32,011 40,723 Benefit plan accruals 31,679 38,038 Purchase accounting 22,473 20,063 Net operating loss carryforwards 21,004 25,135 FDIC deductible premiums 4,891 — Unrealized losses on hedges — 10,277 Other, net 4,860 4,962 Total deferred tax assets 510,306 521,403 Deferred Tax Liabilities Operating lease right-of-use assets (52,710) (51,845) Premises and equipment (12,141) (14,844) Loan servicing rights (9,188) (9,636) Prepaid expenses (3,856) (2,774) Unrealized gains on hedges (3,202) — Deferred loan origination fees (2,361) (3,566) Other, net (3,588) (2,983) Total deferred tax liabilities (87,046) (85,648) Net deferred tax assets $ 423,260 $ 435,755
Schedule of Unrecognized Tax Benefits	The following table presents the changes in the carrying amount of unrecognized tax benefits: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Balance at beginning of period $ 11,007 $ — $ — Additions for acquired uncertain tax positions — 14,897 — Additions based on tax positions related to prior years 60 — — Reductions for tax positions relating to prior years — (2,751) — Reductions due to statute of limitations expiring (1,112) (1,139) — Balance at end of period $ 9,955 $ 11,007 $ —

Share-Based Compensation and _2

Share-Based Compensation and Other Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Changes in Nonvested Restricted Stock Awards	A summary of changes in our unvested shares follows: Years Ended December 31, 2023 2022 (shares in thousands) Shares Weighted Shares Weighted Unvested balance at beginning of period 1,869 $17.76 554 $16.16 Granted during the year 1,042 15.43 1,916 18.12 Vested during the year (924) 17.80 (453) 17.29 Forfeited during the year (55) 16.84 (148) 17.88 Unvested balance at end of period 1,932 $16.51 1,869 $17.76
Summary of Changes in Nonvested Restricted Shares	A summary of changes in our unvested shares follows: Years Ended December 31, 2023 2022 (shares in thousands) Shares Weighted Shares Weighted Unvested balance at beginning of period 2,081 $17.23 886 $14.80 Granted during the year 355 18.01 1,935 17.66 Vested during the year (1,286) 16.29 (720) 15.41 Forfeited during the year (8) 17.82 (73) 16.73 Dividend equivalents adjustment 35 17.21 53 16.82 Unvested balance at end of period 1,177 $17.50 2,081 $17.23
Schedule of Information Related to Stock Option Plan	Information related to stock option and appreciation rights follows: Year Ended December 31, (dollars in thousands) 2023 2022 2021 Intrinsic value of options/appreciation rights exercised $ 70 $ 331 $ 171 Tax benefit realized from options/appreciation rights exercises 28 132 68

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Summary of Table Reconciling Basic and Diluted Net Income Per Share	The following table presents the calculation of basic and diluted net income per common share: (dollars and shares in thousands, Years Ended December 31, 2023 2022 2021 Net income $ 581,992 $ 428,287 $ 277,538 Preferred dividends (16,135) (14,118) — Net income applicable to common shares $ 565,857 $ 414,169 $ 277,538 Weighted average common shares outstanding: Weighted average common shares outstanding (basic) 290,748 275,179 165,178 Effect of dilutive securities: Restricted stock 1,107 1,502 729 Stock appreciation rights — 7 22 Weighted average diluted shares outstanding 291,855 276,688 165,929 Basic Net Income Per Common Share $ 1.95 $ 1.51 $ 1.68 Diluted Net Income Per Common Share $ 1.94 $ 1.50 $ 1.67

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which we have elected the fair value option, are summarized below: Fair Value Measurements at December 31, 2023 Using (dollars in thousands) Carrying Value Quoted Prices in Significant Significant Financial Assets Equity securities $ 80,372 $ 80,372 $ — $ — Investment securities available-for-sale: U.S. Treasury 396,733 396,733 — — U.S. government-sponsored entities and agencies 1,231,264 — 1,231,264 — Mortgage-backed securities - Agency 4,216,560 — 4,216,560 — States and political subdivisions 535,260 — 535,260 — Pooled trust preferred securities 11,337 — 11,337 — Other securities 321,901 — 321,901 — Loans held-for-sale 32,006 — 32,006 — Derivative assets 166,302 — 166,302 — Financial Liabilities Derivative liabilities 268,916 — 268,916 — Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Equity securities $ 52,507 $ 52,507 $ — $ — Investment securities available-for-sale: U.S. Treasury 200,927 200,927 — — U.S. government-sponsored entities and agencies 1,175,080 — 1,175,080 — Mortgage-backed securities - Agency 4,369,902 — 4,369,902 — States and political subdivisions 663,852 — 663,852 — Pooled trust preferred securities 10,811 — 10,811 — Other securities 353,140 — 353,140 — Loans held-for-sale 11,926 — 11,926 — Derivative assets 169,001 — 169,001 — Financial Liabilities Derivative liabilities 380,704 — 380,704 —
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis	Assets measured at fair value on a non-recurring basis at December 31, 2023 are summarized below: Fair Value Measurements at December 31, 2023 Using (dollars in thousands) Carrying Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Significant Unobservable Inputs Collateral Dependent Loans: Commercial loans $ 11,017 $ — $ — $ 11,017 Commercial real estate loans 95,457 — — 95,457 Foreclosed Assets: Commercial real estate 1,669 — — 1,669 Assets measured at fair value on a non-recurring basis at December 31, 2022 are summarized below: Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Collateral Dependent Loans: Commercial loans $ 22,562 $ — $ — $ 22,562 Commercial real estate loans 48,026 — — 48,026
Schedule of Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements	The table below provides quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy: (dollars in thousands) Fair Valuation Unobservable Range (Weighted Average) (1) December 31, 2023 Collateral Dependent Loans Commercial loans $ 11,017 Discounted Discount for type of property, 5% - 37% (27%) Commercial real estate loans 95,457 Discounted Discount for type of property, 2% - 38% (16%) Foreclosed Assets Commercial real estate (1) 1,669 Fair value of collateral Discount for type of property, 4% - 8% (4%) December 31, 2022 Collateral Dependent Loans Commercial loans $ 22,562 Discounted Discount for type of property, 10% - 47% (28%) Commercial real estate loans 48,026 Discounted Discount for type of property, 1% - 26% (11%) (1) Unobservable inputs were weighted by the relative fair value of the instruments.
Schedule of Difference Between the Aggregate Fair Value and the Aggregate Remaining Principal Balance	The difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected was as follows: (dollars in thousands) Aggregate Difference Contractual December 31, 2023 Loans held-for-sale $ 32,006 $ 621 $ 31,385 December 31, 2022 Loans held-for-sale $ 11,926 $ 221 $ 11,705 The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value: (dollars in thousands) Other Interest Interest Total Changes Year Ended December 31, 2023 Loans held-for-sale $ 402 $ 12 $ (14) $ 400 Year Ended December 31, 2022 Loans held-for-sale $ (1,127) $ 10 $ (4) $ (1,121)
Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value	The carrying amounts and estimated fair values of financial instruments not carried at fair value were as follows: Fair Value Measurements at December 31, 2023 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Cash, due from banks, money market, $ 1,175,058 $ 1,175,058 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 825,953 — 671,126 — Mortgage-backed securities - Agency 1,029,131 — 881,994 — State and political subdivisions 1,158,409 — 1,048,068 — Loans, net: Commercial 9,392,267 — — 9,258,193 Commercial real estate 13,984,273 — — 13,640,868 Residential real estate 6,678,606 — — 5,579,999 Consumer 2,629,171 — — 2,555,121 Accrued interest receivable 225,159 859 54,465 169,835 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 9,664,247 $ 9,664,247 $ — $ — Checking, NOW, savings, and money market 21,991,789 21,991,789 — — Time deposits 5,579,144 — 5,552,538 — Federal funds purchased and interbank borrowings 390 390 — — Securities sold under agreements to repurchase 285,206 285,206 — — FHLB advances 4,280,681 — 4,090,954 — Other borrowings 764,870 — 755,592 — Accrued interest payable 57,094 — 57,094 — Standby letters of credit 1,318 — — 1,318 Off-Balance Sheet Financial Instruments Commitments to extend credit $ — $ — $ — $ 3,839 Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Cash, due from banks, money market, $ 728,412 $ 728,412 $ — $ — Investment securities held-to-maturity: U.S. government-sponsored entities and agencies 819,168 — 656,358 — Mortgage-backed securities - Agency 1,106,817 — 982,963 — State and political subdivisions 1,163,162 — 1,004,361 — Loans, net: Commercial 9,386,862 — — 9,066,583 Commercial real estate 12,317,825 — — 11,867,851 Residential real estate 6,438,525 — — 5,372,491 Consumer 2,676,758 — — 2,557,115 Accrued interest receivable 190,521 758 52,081 137,682 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 11,930,798 $ 11,930,798 $ — $ — Checking, NOW, savings, and money market 20,056,252 20,056,252 — — Time deposits 3,013,780 — 2,976,389 — Federal funds purchased and interbank borrowings 581,489 581,489 — — Securities sold under agreements to repurchase 432,804 432,804 — — FHLB advances 3,829,018 — 3,739,780 — Other borrowings 743,003 — 703,156 — Accrued interest payable 19,547 — 19,547 — Standby letters of credit 755 — — 755 Off-Balance Sheet Financial Instruments Commitments to extend credit $ — $ — $ — $ 3,666

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Derivatives	The following table summarizes Old National’s derivatives designated as hedges: December 31, 2023 December 31, 2022 Fair Value Fair Value (dollars in thousands) Notional Assets (1) Liabilities (2) Notional Assets (1) Liabilities (2) Cash flow hedges: Interest rate collars and floors on loan pools $ 1,600,000 $ 10,472 $ 6,014 $ 1,900,000 $ 11,764 $ 47,859 Interest rate swaps on borrowings (3) 150,000 — — 150,000 — — Fair value hedges: Interest rate swaps on investment securities (3) 998,107 — — 909,957 — — Interest rate swaps on borrowings (3) 900,000 — — 300,000 — — Total $ 10,472 $ 6,014 $ 11,764 $ 47,859 (1) Derivative assets are included in other assets on the balance sheet. (2) Derivative liabilities are included in other liabilities on the balance sheet. (3) The fair values of certain counterparty interest rate swaps are zero due to the settlement of centrally cleared variation margin rules.
Schedule of Derivative Instruments Effect on Consolidated Statement of Income	The effect of derivative instruments in fair value hedging relationships on the consolidated statements of income were as follows: (dollars in thousands) Gain (Loss) Derivatives in Location of Gain or Gain (Loss) Hedged Items Location of Gain or Year Ended Interest rate contracts Interest income/(expense) $ (1,769) Fixed-rate debt Interest income/(expense) $ 1,684 Interest rate contracts Interest income/(expense) (52,625) Fixed-rate Interest income/(expense) 52,148 Total $ (54,394) $ 53,832 Year Ended Interest rate contracts Interest income/(expense) $ (6,245) Fixed-rate debt Interest income/(expense) $ 6,585 Interest rate contracts Interest income/(expense) 157,741 Fixed-rate Interest income/(expense) (158,431) Total $ 151,496 $ (151,846) Year Ended Interest rate contracts Interest income/(expense) $ (6,413) Fixed-rate debt Interest income/(expense) $ 6,296 Interest rate contracts Interest income/(expense) (4,656) Fixed-rate Interest income/(expense) 4,954 Total $ (11,069) $ 11,250 The effect of derivative instruments in cash flow hedging relationships on the consolidated statements of income were as follows: Years Ended December 31, Years Ended December 31, 2023 2022 2021 2023 2022 2021 Derivatives in Location of Gain or Gain (Loss) Gain (Loss) Interest rate contracts Interest income/(expense) $ 28,029 $ (45,132) $ 1,898 $ 11,621 $ (2,587) $ 4,605 The effect of derivatives not designated as hedging instruments on the consolidated statements of income were as follows: Years Ended December 31, (dollars in thousands) 2023 2022 2021 Derivatives Not Designated as Location of Gain or (Loss) Gain (Loss) Interest rate contracts (1) Other income/(expense) $ 457 $ 883 $ 279 Mortgage contracts Mortgage banking revenue (401) (2,468) (4,446) Foreign currency contracts Other income/(expense) (45) 98 (104) Total $ 11 $ (1,487) $ (4,271) (1) Includes the valuation differences between the customer and offsetting swaps.
Summary of Derivatives Not Designated as Hedging Instruments	The following table summarizes Old National’s derivatives not designated as hedges: December 31, 2023 December 31, 2022 Fair Value Fair Value (dollars in thousands) Notional Assets (1) Liabilities (2) Notional Assets (1) Liabilities (2) Interest rate lock commitments $ 25,151 $ 291 $ — $ 21,401 $ 93 $ — Forward mortgage loan contracts 39,529 — 566 30,330 32 — Customer interest rate swaps 5,954,216 33,182 228,750 5,220,363 5,676 326,924 Counterparty interest rate swaps (3) 5,954,216 121,969 33,346 5,220,363 151,111 5,711 Customer foreign currency forward contracts 12,455 320 59 8,341 253 42 Counterparty foreign currency forward contracts 12,308 68 181 8,297 72 168 Total $ 155,830 $ 262,902 $ 157,237 $ 332,845 (1) Derivative assets are included in other assets on the balance sheet. (2) Derivative liabilities are included in other liabilities on the balance sheet. (3) The fair values of certain counterparty interest rate swaps are zero due to the settlement of centrally-cleared variation margin rules.
Schedule of Offsetting Assets	The following table presents the fair value of the Company’s derivatives and offsetting positions: December 31, 2023 2022 (dollars in thousands) Assets Liabilities Assets Liabilities Gross amounts recognized $ 166,302 $ 268,916 $ 169,001 $ 380,704 Less: amounts offset in the Consolidated Balance Sheet — — — — Net amount presented in the Consolidated Balance Sheet 166,302 268,916 169,001 380,704 Gross amounts not offset in the Consolidated Balance Sheet Offsetting derivative positions (39,360) (39,360) (54,054) (54,054) Cash collateral pledged — (97,840) (418) (88,860) Net credit exposure $ 126,942 $ 131,716 $ 114,529 $ 237,790
Schedule of Offsetting Liabilities	The following table presents the fair value of the Company’s derivatives and offsetting positions: December 31, 2023 2022 (dollars in thousands) Assets Liabilities Assets Liabilities Gross amounts recognized $ 166,302 $ 268,916 $ 169,001 $ 380,704 Less: amounts offset in the Consolidated Balance Sheet — — — — Net amount presented in the Consolidated Balance Sheet 166,302 268,916 169,001 380,704 Gross amounts not offset in the Consolidated Balance Sheet Offsetting derivative positions (39,360) (39,360) (54,054) (54,054) Cash collateral pledged — (97,840) (418) (88,860) Net credit exposure $ 126,942 $ 131,716 $ 114,529 $ 237,790

Commitments, Contingencies, a_2

Commitments, Contingencies, and Financial Guarantees (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Summary of Loan Commitments	The following table summarizes Old National’s other borrowings: December 31, (dollars in thousands) 2023 2022 Old National Bancorp: Senior unsecured notes (fixed rate 4.125%) maturing August 2024 $ 175,000 $ 175,000 Unamortized debt issuance costs related to senior unsecured notes (91) (247) Subordinated debentures (fixed rate 5.875%) maturing September 2026 150,000 150,000 Junior subordinated debentures (rates of 6.95% to 9.22%) maturing July 2031 to September 2037 136,643 136,643 Other basis adjustments 18,207 23,363 Old National Bank: Finance lease liabilities 20,955 13,469 Subordinated debentures (3-month SOFR plus 4.618%; variable rate 10.01%) maturing October 2025 12,000 12,000 Leveraged loans for NMTC (fixed rates of 1.00% to 1.43%) maturing December 2046 to June 2060 154,284 143,187 Other (1) 97,872 89,588 Total other borrowings $ 764,870 $ 743,003 (1) Includes overnight borrowings to collateralize certain derivative positions totaling $97.6 million at December 31, 2023 and $88.0 million at December 31, 2022. The following table summarizes the terms of our outstanding junior subordinated debentures as of December 31, 2023: (dollars in thousands) Name of Trust Issuance Date Issuance Rate Rate at December 31, Maturity Date Bridgeview Statutory Trust I July 2001 $ 15,464 3-month SOFR plus 3.58% 9.22 % July 31, 2031 Bridgeview Capital Trust II December 2002 15,464 3-month SOFR plus 3.35% 9.01 % January 7, 2033 First Midwest Capital Trust I November 2003 37,825 6.95% fixed 6.95 % December 1, 2033 St. Joseph Capital Trust II March 2005 5,155 3-month SOFR plus 1.75% 7.39 % March 17, 2035 Northern States Statutory Trust I September 2005 10,310 3-month SOFR plus 1.80% 7.45 % September 15, 2035 Anchor Capital Trust III August 2005 5,000 3-month SOFR plus 1.55% 7.14 % September 30, 2035 Great Lakes Statutory Trust II December 2005 6,186 3-month SOFR plus 1.40% 7.05 % December 15, 2035 Home Federal Statutory September 2006 15,464 3-month SOFR plus 1.65% 7.30 % September 15, 2036 Monroe Bancorp Capital July 2006 3,093 3-month SOFR plus 1.60% 7.26 % October 7, 2036 Tower Capital Trust 3 December 2006 9,279 3-month SOFR plus 1.69% 7.33 % March 1, 2037 Monroe Bancorp Statutory March 2007 5,155 3-month SOFR plus 1.60% 7.25 % June 15, 2037 Great Lakes Statutory Trust III June 2007 8,248 3-month SOFR plus 1.70% 7.35 % September 15, 2037 Total $ 136,643 The following table summarizes Old National Bank’s unfunded loan commitments and standby letters of credit: December 31, (dollars in thousands) 2023 2022 Unfunded loan commitments $ 8,912,587 $ 8,979,334 Standby letters of credit (1) 192,237 174,070 (1) Notional amount, which represents the maximum amount of future funding requirements. The carrying value was $1.3 million at December 31, 2023 and $0.8 million at December 31, 2022.

Regulatory Restrictions (Tables

Regulatory Restrictions (Tables)	12 Months Ended
	Dec. 31, 2023
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract]
Schedule of Capital Ratios	The following table summarizes capital ratios for Old National and Old National Bank: Actual Regulatory Minimum (1) Prompt Corrective Action “Well Capitalized” Guidelines (2) (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio December 31, 2023 Total capital to risk-weighted Old National Bancorp $ 4,727,216 12.64 % $ 3,927,771 10.50 % $ 3,740,735 10.00 % Old National Bank 4,591,734 12.33 3,911,089 10.50 3,724,847 10.00 Common equity Tier 1 capital Old National Bancorp 4,003,694 10.70 2,618,514 7.00 N/A N/A Old National Bank 4,308,574 11.57 2,607,393 7.00 2,421,150 6.50 Tier 1 capital to risk-weighted Old National Bancorp 4,247,413 11.35 3,179,625 8.50 2,244,441 6.00 Old National Bank 4,308,574 11.57 3,166,120 8.50 2,979,878 8.00 Tier 1 capital to average assets Old National Bancorp 4,247,413 8.83 1,923,360 4.00 N/A N/A Old National Bank 4,308,574 8.99 1,916,002 4.00 2,395,003 5.00 December 31, 2022 Total capital to risk-weighted Old National Bancorp $ 4,321,716 12.02 % $ 3,774,845 10.50 % $ 3,595,090 10.00 % Old National Bank 4,063,363 11.35 3,759,671 10.50 3,580,639 10.00 Common equity Tier 1 capital Old National Bancorp 3,605,393 10.03 2,516,563 7.00 N/A N/A Old National Bank 3,817,402 10.66 2,506,448 7.00 2,327,416 6.50 Tier 1 capital to risk-weighted Old National Bancorp 3,849,112 10.71 3,055,827 8.50 2,157,054 6.00 Old National Bank 3,817,402 10.66 3,043,544 8.50 2,864,512 8.00 Tier 1 capital to average assets Old National Bancorp 3,849,112 8.52 1,808,108 4.00 N/A N/A Old National Bank 3,817,402 8.47 1,803,426 4.00 2,254,282 5.00 (1) “Regulatory Minimum” capital ratios include the 2.5% “capital conservation buffer” required under the Basel III Capital Rules. (2) “Well-capitalized” minimum common equity Tier 1 capital to risk-weighted assets and Tier 1 capital to average assets ratios are not formally defined under applicable banking regulations for bank holding companies.

Parent Company Financial Stat_2

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Balance Sheets	The following are the condensed parent company only financial statements of Old National: OLD NATIONAL BANCORP (PARENT COMPANY ONLY) December 31, (dollars in thousands) 2023 2022 Assets Deposits in affiliate bank $ 284,294 $ 418,959 Equity securities 51,241 30,717 Investment securities - available-for-sale 15,886 16,814 Investment in affiliates: Banking subsidiaries 5,530,637 5,000,153 Non-banks 44,395 44,938 Goodwill 59,506 59,506 Other assets 127,540 135,025 Total assets $ 6,113,499 $ 5,706,112 Liabilities and Shareholders’ Equity Other liabilities $ 70,840 $ 92,758 Other borrowings 479,759 484,759 Shareholders’ equity 5,562,900 5,128,595 Total liabilities and shareholders’ equity $ 6,113,499 $ 5,706,112
Schedule of Condensed Statements of Income	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2023 2022 2021 Income Dividends from affiliates $ 150,000 $ — $ 125,000 Other income 2,919 1,733 3,364 Other income from affiliates 5 5 5 Total income 152,924 1,738 128,369 Expense Interest on borrowings 20,700 16,662 8,285 Other expenses 43,185 37,629 13,951 Total expense 63,885 54,291 22,236 Income (loss) before income taxes and equity in undistributed earnings of affiliates 89,039 (52,553) 106,133 Income tax expense (benefit) (11,325) (9,901) (5,113) Income (loss) before equity in undistributed earnings of affiliates 100,364 (42,652) 111,246 Equity in undistributed earnings of affiliates 481,628 470,939 166,292 Net income 581,992 428,287 277,538 Preferred dividends (16,135) (14,118) — Net income applicable to common shareholders $ 565,857 $ 414,169 $ 277,538
Schedule of Condensed Statement of Cash Flows	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2023 2022 2021 Cash Flows From Operating Activities Net income $ 581,992 $ 428,287 $ 277,538 Adjustments to reconcile net income to cash Depreciation 18 26 30 Share-based compensation expense 27,910 28,656 7,497 (Increase) decrease in other assets (19,353) (40,620) 10,213 Increase (decrease) in other liabilities (2,561) 10,455 (4,918) Equity in undistributed earnings of affiliates (481,628) (470,939) (166,292) Net cash flows provided by (used in) operating activities 106,378 (44,135) 124,068 Cash Flows From Investing Activities Net cash and cash equivalents of acquisitions — 573,099 — Proceeds from sales of investment securities — — 1,000 Proceeds from sales of equity securities — 44,038 540 Purchase of equity securities (17,773) — — Purchases of investment securities — (9,000) (15) Purchases of premises and equipment (8) — (3) Net cash flows provided by (used in) investing activities (17,781) 608,137 1,522 Cash Flows From Financing Activities Cash dividends paid (180,030) (177,623) (92,829) Common stock repurchased (44,308) (71,182) (3,731) Common stock issued 1,076 809 583 Net cash flows provided by (used in) financing activities (223,262) (247,996) (95,977) Net increase (decrease) in cash and cash equivalents (134,665) 316,006 29,613 Cash and cash equivalents at beginning of period 418,959 102,953 73,340 Cash and cash equivalents at end of period $ 284,294 $ 418,959 $ 102,953

Basis of Presentation and Sig_4

Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Feb. 28, 2022	Feb. 15, 2022	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Issuance of common stock				$ 2,446,312
Series A Preferred Stock
Property, Plant and Equipment [Line Items]
Shares issued for acquisition (in shares)		108,000
Series C Preferred Stock
Property, Plant and Equipment [Line Items]
Shares issued for acquisition (in shares)		122,500
Preferred Stock
Property, Plant and Equipment [Line Items]
Issuance of common stock	$ 243,700
First Midwest
Property, Plant and Equipment [Line Items]
Shares issued for acquisition (in shares)	129,400,000
Issuance of common stock	$ 2,400,000
Minimum
Property, Plant and Equipment [Line Items]
Maturity of short-term securities sold under agreements to repurchase			1 day
Minimum | Core Deposits and Other Intangible Assets
Property, Plant and Equipment [Line Items]
Estimated useful lives of core deposits and customer relationships			5 years
Minimum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			10 years
Minimum | Furniture and Equipment
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			3 years
Maximum
Property, Plant and Equipment [Line Items]
Maturity of short-term securities sold under agreements to repurchase			4 days
Maximum | Core Deposits and Other Intangible Assets
Property, Plant and Equipment [Line Items]
Estimated useful lives of core deposits and customer relationships			15 years
Maximum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			39 years
Maximum | Furniture and Equipment
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			7 years

Basis of Presentation and Sig_5

Basis of Presentation and Significant Accounting Policies - Summary of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash payments:
Interest	$ 666,121	$ 118,165	$ 42,196
Income taxes, net of refunds	190,303	66,109	31,875
Noncash Investing and Financing Activities:
Securities transferred from available-for-sale to held-to-maturity	0	2,986,736	0
Transfer of premises and equipment to assets held-for-sale	0	7,905	9,539
Operating lease right-of-use assets obtained in exchange for lease obligations	20,260	28,265
Operating lease right-of-use assets obtained in exchange for lease obligations			776
Finance lease right-of-use assets obtained in exchange for lease obligations	$ 10,019		$ 7,477
Finance lease right-of-use assets obtained in exchange for lease obligations		$ (966)

Merger, Acquisition, and Dive_3

Merger, Acquisition, and Divestiture Activity - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Nov. 18, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 26, 2023 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Allowance for credit losses		$ 303,671	$ 307,610	$ 303,671	$ 107,341			$ 131,388
Plan assets		16,600	0	16,600
Assets		46,763,372	49,089,836	46,763,372
Total loans		31,123,641	32,991,927	31,123,641
Deposits		35,000,830	37,235,180	35,000,830
Deposits, health savings accounts	$ 382,000
Gain on sale of health savings accounts	$ 90,700		0	90,673	0
Property optimization		26,800	1,559	26,818	$ 0
First Midwest
Business Acquisition [Line Items]
Transaction costs, expensed			28,700	120,900
Allowance for credit losses		$ 96,300		$ 96,300
First Midwest | Unfunded Loan Commitment
Business Acquisition [Line Items]
Allowance for credit losses			$ 11,000
CapStar Financial Holdings, Inc.
Business Acquisition [Line Items]
Shares exchange ratio						1.155
Value of issuance common stock shares						$ 344,400
Share price (in dollars per share) | $ / shares						$ 16.64
CapStar Financial Holdings, Inc. | CapStar Financial Holdings, Inc.
Business Acquisition [Line Items]
Assets							$ 3,300,000
Total loans							2,300,000
Deposits							$ 2,800,000

Merger, Acquisition, and Dive_4

Merger, Acquisition, and Divestiture Activity - Total Consideration (Details) - USD ($) $ / shares in Units, shares in Thousands		12 Months Ended
	Feb. 15, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Goodwill		$ 1,998,716,000	$ 1,998,716,000	$ 1,036,994,000	$ 1,036,994,000
Fair value of consideration
Issuance of common stock			2,446,312,000
Common Stock
Fair value of consideration
Issuance of common stock		$ 129,365,000	$ 129,365,000
Share price (in dollars per share)		$ 18.92
First Midwest
Assets
Cash and cash equivalents	$ 1,912,629,000
Investment securities	3,526,278,000
FHLB/Federal Reserve Bank stock	106,097,000
Loans held-for-sale	13,809,000
Loans, net of allowance for credit losses	14,298,873,000
Premises and equipment	111,867,000
Operating lease right-of-use assets	129,698,000
Accrued interest receivable	53,502,000
Goodwill	961,722,000
Other intangible assets	117,584,000
Company-owned life insurance	301,025,000
Other assets	317,258,000
Total assets	21,850,342,000
Liabilities
Deposits	17,249,404,000
Securities sold under agreements to repurchase	135,194,000
Federal Home Loan Bank advances	1,158,623,000
Other borrowings	274,569,000
Accrued expenses and other liabilities	342,369,000
Total liabilities	19,160,159,000
Fair value of consideration
Total consideration	$ 2,690,182,000
First Midwest | Preferred Stock
Fair value of consideration
Issuance of common stock shares for acquisitions of business (in shares)	243,870
First Midwest | Common Stock
Fair value of consideration
Issuance of common stock shares for acquisitions of business (in shares)	2,446,312

Investment Securities - Additio

Investment Securities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary of Investment Holdings [Line Items]
Securities pledged to secure public and other funds, carrying value	$ 8,400,000,000	$ 6,100,000,000
Transfers from available-for-sale to held-to-maturity	127,600,000	148,900,000
Allowance for credit losses for available-for-sale debt securities	$ 0	$ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
Allowance for securities held-to-maturity	$ (150,000)	$ (150,000)
Accrued interest receivable	$ 50,300,000	50,900,000
Number of securities in security portfolio | security	2,920
Number of securities in unrealized loss position | security	2,588
Equity securities, at fair value	$ 80,372,000	52,507,000
(Losses) gains on equity securities	21,500,000	(4,900,000)	$ 200,000
Downward adjustments on equity securities without readily determinable fair value	0	0	0
Impairments on equity securities without readily determinable fair value	0	0	$ 0
Other Assets
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	449,300,000	$ 396,800,000
Other Assets | Partnership Interest
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	252,200,000
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	197,100,000
Indiana
Summary of Investment Holdings [Line Items]
Investment securities issued by states and political subdivisions, market value	$ 600,900,000
State and political subdivision investment, equity percentage	10.80%
Percentage of municipal bonds rated A or better	99.60%
Percentage of non rated local interest bonds	0.40%

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-Sale
Amortized Cost	$ 7,684,889	$ 7,772,603
Unrealized Gains	4,607	3,028
Unrealized Losses	(874,143)	(847,474)
Basis Adjustments	(102,298)	(154,445)
Fair Value	6,713,055	6,773,712
Held-to-Maturity
Allowance for securities held-to-maturity	(150)	(150)
Total held-to-maturity securities	3,013,493	3,089,147
Unrealized Gains	1,800	221
Unrealized Losses	(414,105)	(445,686)
Basis adjustments	0	0
Investment securities-held-to-maturity, fair value	2,601,188	2,643,682
U.S. Treasury
Available-for-Sale
Amortized Cost	449,817	253,148
Unrealized Gains	154	5
Unrealized Losses	(11,941)	(5,189)
Basis Adjustments	(41,297)	(47,037)
Fair Value	396,733	200,927
U.S. government-sponsored entities and agencies
Available-for-Sale
Amortized Cost	1,487,879	1,451,736
Unrealized Gains	33	0
Unrealized Losses	(192,717)	(169,248)
Basis Adjustments	(63,931)	(107,408)
Fair Value	1,231,264	1,175,080
Held-to-Maturity
Amortized Cost	825,953	819,168
Unrealized Gains	0	0
Unrealized Losses	(154,827)	(162,810)
Basis adjustments	0	0
Investment securities-held-to-maturity, fair value	671,126	656,358
Mortgage-backed securities
Available-for-Sale
Amortized Cost	4,835,319	4,986,354
Unrealized Gains	3,093	976
Unrealized Losses	(621,852)	(617,428)
Basis Adjustments	0	0
Fair Value	4,216,560	4,369,902
Held-to-Maturity
Amortized Cost	1,029,131	1,106,817
Unrealized Gains	0	0
Unrealized Losses	(147,137)	(123,854)
Basis adjustments	0	0
Investment securities-held-to-maturity, fair value	881,994	982,963
States and political subdivisions
Available-for-Sale
Amortized Cost	554,509	688,159
Unrealized Gains	878	1,789
Unrealized Losses	(23,057)	(26,096)
Basis Adjustments	2,930	0
Fair Value	535,260	663,852
Held-to-Maturity
Amortized Cost	1,158,559	1,163,312
Unrealized Gains	1,800	221
Unrealized Losses	(112,141)	(159,022)
Basis adjustments	0	0
Investment securities-held-to-maturity, fair value	1,048,218	1,004,511
Pooled trust preferred securities
Available-for-Sale
Amortized Cost	13,797	13,783
Unrealized Gains	0	0
Unrealized Losses	(2,460)	(2,972)
Basis Adjustments	0	0
Fair Value	11,337	10,811
Other securities
Available-for-Sale
Amortized Cost	343,568	379,423
Unrealized Gains	449	258
Unrealized Losses	(22,116)	(26,541)
Basis Adjustments	0	0
Fair Value	$ 321,901	$ 353,140

Investment Securities - Proceed

Investment Securities - Proceeds from Sales or Calls and Realized Gain and Losses of Available-for-sale Investment Securities and Other Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Proceeds	$ 154,339	$ 90,840	$ 357,704
Realized gains	1,006	531	4,505
Realized losses	$ (7,271)	$ (619)	$ (178)

Investment Securities - Expecte

Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale, Amortized Cost
Within one year	$ 378,992
One to five years	1,875,152
Five to ten years	3,944,940
Beyond ten years	1,485,805
Amortized Cost	7,684,889	$ 7,772,603
Available-for-sale, Fair Value
Within one year	375,976
One to five years	1,736,452
Five to ten years	3,408,082
Beyond ten years	1,192,545
Total	$ 6,713,055	6,773,712
Available-for-sale, Weighted Average Yield
Within one year	4.37%
One to five years	3.14%
Five to ten years	2.39%
Beyond ten years	2.60%
Total	2.71%
Held-to-Maturity, Amortized Cost
One to five years	$ 161,440
Five to ten years	1,183,893
Beyond ten years	1,668,160
Total held-to-maturity securities	3,013,493	3,089,147
Held-to-Maturity, Fair Value
One to five years	134,333
Five to ten years	1,040,925
Beyond ten years	1,425,930
Total	$ 2,601,188	$ 2,643,682
Held-to-Maturity, Weighted Average Yield
One to five years	2.65%
Five to ten years	2.66%
Beyond ten years	2.72%
Total	2.69%

Investment Securities - Availab

Investment Securities - Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 224,979	$ 4,465,728
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,476)	(480,166)
Available-for-Sale, 12 months or longer, Fair Value	5,742,885	1,992,246
Available-for-Sale, 12 months or longer, Unrealized Losses	(872,667)	(367,308)
Available-for-Sale, Fair Value	5,967,864	6,457,974
Available-for-Sale, Unrealized Losses	(874,143)	(847,474)
U.S. Treasury
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	8,937	130,967
Available-for-Sale, Less than 12 Months, Unrealized Losses	(42)	(3,264)
Available-for-Sale, 12 months or longer, Fair Value	191,027	66,992
Available-for-Sale, 12 months or longer, Unrealized Losses	(11,899)	(1,925)
Available-for-Sale, Fair Value	199,964	197,959
Available-for-Sale, Unrealized Losses	(11,941)	(5,189)
U.S. government-sponsored entities and agencies
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	0	454,854
Available-for-Sale, Less than 12 Months, Unrealized Losses	0	(75,795)
Available-for-Sale, 12 months or longer, Fair Value	1,189,314	720,226
Available-for-Sale, 12 months or longer, Unrealized Losses	(192,717)	(93,453)
Available-for-Sale, Fair Value	1,189,314	1,175,080
Available-for-Sale, Unrealized Losses	(192,717)	(169,248)
Mortgage-backed securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	90,145	3,207,319
Available-for-Sale, Less than 12 Months, Unrealized Losses	(710)	(358,507)
Available-for-Sale, 12 months or longer, Fair Value	3,835,552	1,116,205
Available-for-Sale, 12 months or longer, Unrealized Losses	(621,142)	(258,921)
Available-for-Sale, Fair Value	3,925,697	4,323,524
Available-for-Sale, Unrealized Losses	(621,852)	(617,428)
States and political subdivisions
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	86,865	414,813
Available-for-Sale, Less than 12 Months, Unrealized Losses	(495)	(25,555)
Available-for-Sale, 12 months or longer, Fair Value	259,767	2,703
Available-for-Sale, 12 months or longer, Unrealized Losses	(22,562)	(541)
Available-for-Sale, Fair Value	346,632	417,516
Available-for-Sale, Unrealized Losses	(23,057)	(26,096)
Pooled trust preferred securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	0	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	0	0
Available-for-Sale, 12 months or longer, Fair Value	11,337	10,811
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,460)	(2,972)
Available-for-Sale, Fair Value	11,337	10,811
Available-for-Sale, Unrealized Losses	(2,460)	(2,972)
Other securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	39,032	257,775
Available-for-Sale, Less than 12 Months, Unrealized Losses	(229)	(17,045)
Available-for-Sale, 12 months or longer, Fair Value	255,888	75,309
Available-for-Sale, 12 months or longer, Unrealized Losses	(21,887)	(9,496)
Available-for-Sale, Fair Value	294,920	333,084
Available-for-Sale, Unrealized Losses	$ (22,116)	$ (26,541)

Investment Securities - Held-to

Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value
Less than 12 months	$ 0	$ 1,560,831
12 months or longer	2,530,274	1,052,753
Total	2,530,274	2,613,584
Unrecognized Losses
Less than 12 months	0	(280,316)
12 months or longer	(414,105)	(165,370)
Total	(414,105)	(445,686)
U.S. government-sponsored entities and agencies
Fair Value
Less than 12 months	0	354,293
12 months or longer	671,126	302,066
Total	671,126	656,359
Unrecognized Losses
Less than 12 months	0	(110,523)
12 months or longer	(154,827)	(52,287)
Total	(154,827)	(162,810)
Mortgage-backed securities
Fair Value
Less than 12 months	0	367,849
12 months or longer	881,994	615,114
Total	881,994	982,963
Unrecognized Losses
Less than 12 months	0	(42,438)
12 months or longer	(147,137)	(81,416)
Total	(147,137)	(123,854)
States and political subdivisions
Fair Value
Less than 12 months	0	838,689
12 months or longer	977,154	135,573
Total	977,154	974,262
Unrecognized Losses
Less than 12 months	0	(127,355)
12 months or longer	(112,141)	(31,667)
Total	$ (112,141)	$ (159,022)

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) segment portfolio	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan participations	$ 2,800,000,000
Loan participations sold	1,200,000,000
Loan participations retained	$ 1,600,000,000
Number of loan portfolios | portfolio	4
Number of loan segments | segment	7
Accrued interest receivable on loans	$ 169,800,000	$ 137,700,000
Loan placed on nonaccrual when past due, number of days	90 days
Unfunded commitments on TDRs	$ 0	$ 0
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of risk-based capital	244%
Regulatory guideline limit	300%
Maximum
Financing Receivable, Allowance for Credit Losses [Line Items]
Aggregate amount of loans to related parties	5%	5%

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 32,991,927	$ 31,123,641
Allowance for credit losses on loans	(307,610)	(303,671)	$ (107,341)	$ (131,388)
Net loans	32,684,317	30,819,970
Taxable	1,815,390	1,177,816	490,042
Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	32,991,927	31,123,641
Allowance for credit losses on loans	(307,610)	(303,671)
Net loans	32,684,317	30,819,970
Taxable	93,700	126,700
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	9,512,230	9,508,904
Allowance for credit losses on loans	(118,333)	(120,612)	(27,232)	(30,567)
Commercial | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	(232,764)	(210,280)
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	9,279,466	9,298,624
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	14,140,629	12,457,070
Allowance for credit losses on loans	(155,099)	(138,244)	(64,004)	(75,810)
Commercial real estate | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	(169,058)	(158,322)
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	13,971,571	12,298,748
BBCC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses on loans	(2,887)	(2,431)	(2,458)	(6,120)
BBCC | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	401,822	368,602
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	401,822	368,602
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Allowance for credit losses on loans	(20,837)	(21,916)	(9,347)	(12,608)
Residential real estate | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	2,639,625	2,697,226
Consumer | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	(2,639,625)	(2,697,226)
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Allowance for credit losses on loans	(1,236)	(1,532)	(1,743)	(3,580)
Indirect | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	523,172	629,186
Allowance for credit losses on loans	(3,169)	(12,116)	(528)	(855)
Direct | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	523,172	629,186
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	523,172	629,186
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Allowance for credit losses on loans	(6,049)	(6,820)	$ (2,029)	$ (1,848)
Home equity | Portfolio Segment Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Direct Finance Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 169,700	$ 188,100

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		$ 303,671	$ 107,341	$ 131,388
Charge-offs	$ (68,463)	(68,463)	(27,281)	(4,310)
Recoveries		12,553	11,182	9,075
Provision (Release) for Loan Losses		59,849	123,340	(28,812)
Balance at End of Period	307,610	307,610	303,671	107,341
Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	89,089	0
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		120,612	27,232	30,567
Charge-offs		(41,451)	(6,885)	(1,228)
Recoveries		4,172	4,610	791
Provision (Release) for Loan Losses		35,000	56,875	(2,898)
Balance at End of Period	118,333	118,333	120,612	27,232
Commercial | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	38,780	0
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		138,244	64,004	75,810
Charge-offs		(11,198)	(6,519)	(264)
Recoveries		2,417	1,095	4,403
Provision (Release) for Loan Losses		25,636	30,245	(15,945)
Balance at End of Period	155,099	155,099	138,244	64,004
Commercial real estate | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	49,419	0
BBCC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		2,431	2,458	6,120
Charge-offs		(1,650)	(85)	(144)
Recoveries		275	281	105
Provision (Release) for Loan Losses		1,831	(223)	(3,623)
Balance at End of Period	2,887	2,887	2,431	2,458
BBCC | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	0	0
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		21,916	9,347	12,608
Charge-offs	(256)	(256)	(344)	(346)
Recoveries		1,268	760	339
Provision (Release) for Loan Losses		(2,091)	12,017	(3,254)
Balance at End of Period	20,837	20,837	21,916	9,347
Residential real estate | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	136	0
Indirect
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		1,532	1,743	3,580
Charge-offs	(2,948)	(2,948)	(2,525)	(1,087)
Recoveries		1,559	1,263	1,682
Provision (Release) for Loan Losses		1,093	1,051	(2,432)
Balance at End of Period	1,236	1,236	1,532	1,743
Indirect | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	0	0
Direct
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		12,116	528	855
Charge-offs	(10,517)	(10,517)	(10,799)	(1,159)
Recoveries		2,331	2,557	777
Provision (Release) for Loan Losses		(761)	19,799	55
Balance at End of Period	3,169	3,169	12,116	528
Direct | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		0	31	0
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		6,820	2,029	1,848
Charge-offs	(443)	(443)	(124)	(82)
Recoveries		531	616	978
Provision (Release) for Loan Losses		(859)	3,576	(715)
Balance at End of Period	$ 6,049	6,049	6,820	2,029
Home equity | Allowance Established for Acquired PCD Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance Established for Acquired PCD Loans		$ 0	$ 723	$ 0

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Schedule of Allowance for Credit Losses on Unfunded Loan Commitments (Details) - Unfunded Loan Commitment - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 32,188	$ 10,879	$ 11,689
Provision (release) for credit losses on unfunded loan commitments	(962)	10,296	(810)
Balance at end of period	31,226	32,188	10,879
Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses on unfunded loan commitments acquired during the period	$ 0	$ 11,013	$ 0

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Risk Category Of Loans [Line Items]
Total loans	$ 32,991,927	$ 32,991,927	$ 31,123,641
2023	1,114
2022	10,423
2021	30,346
2020	3,274
2019	8,604
Prior	10,411
Revolving	4,291
Total	68,463	68,463	27,281	$ 4,310
Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Total loans	32,991,927	32,991,927	31,123,641
Commercial
Risk Category Of Loans [Line Items]
Total loans	9,512,230	9,512,230	9,508,904
Total		41,451	6,885	1,228
Commercial | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,873,630	1,873,630	2,473,145
Originated one year before current year	1,719,159	1,719,159	1,851,604
Originated two years before current year	1,039,832	1,039,832	880,723
Originated three years before current year	600,282	600,282	802,628
Originated four years before current year	489,693	489,693	382,993
Originated more than five years before current fiscal year	583,939	583,939	423,484
Revolving	2,214,453	2,214,453	2,118,835
Revolving to Term	758,478	758,478	365,212
Total loans	9,279,466	9,279,466	9,298,624
2023	0
2022	6,475
2021	24,022
2020	120
2019	7,245
Prior	2,880
Revolving	709
Total	41,451
Commercial real estate
Risk Category Of Loans [Line Items]
Total loans	14,140,629	14,140,629	12,457,070
Total		11,198	6,519	264
Commercial real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	2,279,487	2,279,487	3,193,582
Originated one year before current year	3,664,419	3,664,419	2,928,035
Originated two years before current year	2,695,350	2,695,350	2,050,913
Originated three years before current year	1,636,367	1,636,367	1,384,735
Originated four years before current year	1,163,055	1,163,055	823,735
Originated more than five years before current fiscal year	1,350,392	1,350,392	1,139,730
Revolving	107,225	107,225	57,818
Revolving to Term	1,075,276	1,075,276	720,200
Total loans	13,971,571	13,971,571	12,298,748
2023	0
2022	54
2021	2,808
2020	2,144
2019	0
Prior	6,192
Revolving	0
Total	11,198
BBCC
Risk Category Of Loans [Line Items]
Total		1,650	85	144
BBCC | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	81,840	81,840	92,738
Originated one year before current year	65,503	65,503	64,973
Originated two years before current year	46,152	46,152	53,229
Originated three years before current year	39,072	39,072	38,138
Originated four years before current year	28,622	28,622	24,464
Originated more than five years before current fiscal year	21,170	21,170	11,690
Revolving	70,966	70,966	61,565
Revolving to Term	48,497	48,497	21,805
Total loans	401,822	401,822	368,602
2023	670
2022	548
2021	362
2020	70
2019	0
Prior	0
Revolving	0
Total	1,650
Residential real estate
Risk Category Of Loans [Line Items]
Originated in current fiscal year	453,859	453,859	1,327,227
Originated one year before current year	1,513,234	1,513,234	1,946,321
Originated two years before current year	1,840,082	1,840,082	1,826,623
Originated three years before current year	1,708,506	1,708,506	479,402
Originated four years before current year	434,861	434,861	138,086
Originated more than five years before current fiscal year	748,622	748,622	742,687
Revolving	0	0	7
Revolving to Term	279	279	88
Total loans	6,699,443	6,699,443	6,460,441
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	256
Revolving	0
Total	256	256	344	346
Residential real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Total loans	6,699,443	6,699,443	6,460,441
Residential real estate | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	453,743	453,743	1,327,168
Originated one year before current year	1,508,671	1,508,671	1,945,792
Originated two years before current year	1,836,078	1,836,078	1,825,762
Originated three years before current year	1,705,131	1,705,131	478,529
Originated four years before current year	430,783	430,783	136,260
Originated more than five years before current fiscal year	722,987	722,987	712,175
Revolving	0	0	7
Revolving to Term	279	279	88
Total loans	6,657,672	6,657,672	6,425,781
Residential real estate | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	116	116	59
Originated one year before current year	4,563	4,563	529
Originated two years before current year	4,004	4,004	861
Originated three years before current year	3,375	3,375	873
Originated four years before current year	4,078	4,078	1,826
Originated more than five years before current fiscal year	25,635	25,635	30,512
Revolving	0	0	0
Revolving to Term	0	0	0
Total loans	41,771	41,771	34,660
Indirect
Risk Category Of Loans [Line Items]
Originated in current fiscal year	393,741	393,741	504,758
Originated one year before current year	357,294	357,294	250,481
Originated two years before current year	163,942	163,942	144,910
Originated three years before current year	83,418	83,418	82,835
Originated four years before current year	38,285	38,285	31,788
Originated more than five years before current fiscal year	14,106	14,106	19,423
Revolving	0	0	0
Revolving to Term	196	196	62
Total loans	1,050,982	1,050,982	1,034,257
2023	271
2022	1,447
2021	787
2020	159
2019	152
Prior	132
Revolving	0
Total	2,948	2,948	2,525	1,087
Indirect | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Total loans	1,050,982	1,050,982	1,034,257
Indirect | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	393,369	393,369	504,410
Originated one year before current year	355,822	355,822	249,407
Originated two years before current year	162,735	162,735	144,265
Originated three years before current year	82,871	82,871	82,304
Originated four years before current year	37,967	37,967	31,484
Originated more than five years before current fiscal year	13,815	13,815	19,095
Revolving	0	0	0
Revolving to Term	196	196	62
Total loans	1,046,775	1,046,775	1,031,027
Indirect | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	372	372	348
Originated one year before current year	1,472	1,472	1,074
Originated two years before current year	1,207	1,207	645
Originated three years before current year	547	547	531
Originated four years before current year	318	318	304
Originated more than five years before current fiscal year	291	291	328
Revolving	0	0	0
Revolving to Term	0	0	0
Total loans	4,207	4,207	3,230
Direct
Risk Category Of Loans [Line Items]
Originated in current fiscal year	109,439	109,439	133,049
Originated one year before current year	90,841	90,841	164,977
Originated two years before current year	93,008	93,008	78,020
Originated three years before current year	48,947	48,947	58,124
Originated four years before current year	29,869	29,869	45,626
Originated more than five years before current fiscal year	71,001	71,001	60,738
Revolving	75,204	75,204	87,627
Revolving to Term	4,863	4,863	1,025
Total loans	523,172	523,172	629,186
2023	173
2022	1,899
2021	2,367
2020	746
2019	1,207
Prior	543
Revolving	3,582
Total	10,517	10,517	10,799	1,159
Direct | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Total loans	523,172	523,172	629,186
Direct | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	109,372	109,372	132,934
Originated one year before current year	90,310	90,310	164,126
Originated two years before current year	92,491	92,491	77,406
Originated three years before current year	48,387	48,387	57,919
Originated four years before current year	29,659	29,659	45,299
Originated more than five years before current fiscal year	67,129	67,129	59,212
Revolving	75,080	75,080	87,622
Revolving to Term	4,852	4,852	671
Total loans	517,280	517,280	625,189
Direct | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	67	67	115
Originated one year before current year	531	531	851
Originated two years before current year	517	517	614
Originated three years before current year	560	560	205
Originated four years before current year	210	210	327
Originated more than five years before current fiscal year	3,872	3,872	1,526
Revolving	124	124	5
Revolving to Term	11	11	354
Total loans	5,892	5,892	3,997
Home equity
Risk Category Of Loans [Line Items]
Originated in current fiscal year	290	290	1,085
Originated one year before current year	474	474	1,056
Originated two years before current year	488	488	2,015
Originated three years before current year	544	544	1,943
Originated four years before current year	1,420	1,420	1,777
Originated more than five years before current fiscal year	8,810	8,810	15,954
Revolving	1,022,233	1,022,233	991,699
Revolving to Term	31,212	31,212	18,254
Total loans	1,065,471	1,065,471	1,033,783
2023	0
2022	0
2021	0
2020	35
2019	0
Prior	408
Revolving	0
Total	443	443	124	$ 82
Home equity | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Total loans	1,065,471	1,065,471	1,033,783
Home equity | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	290	290	919
Originated one year before current year	164	164	896
Originated two years before current year	160	160	1,849
Originated three years before current year	140	140	1,497
Originated four years before current year	679	679	983
Originated more than five years before current fiscal year	4,483	4,483	11,646
Revolving	1,019,389	1,019,389	990,001
Revolving to Term	23,918	23,918	14,792
Total loans	1,049,223	1,049,223	1,022,583
Home equity | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	0	0	166
Originated one year before current year	310	310	160
Originated two years before current year	328	328	166
Originated three years before current year	404	404	446
Originated four years before current year	741	741	794
Originated more than five years before current fiscal year	4,327	4,327	4,308
Revolving	2,844	2,844	1,698
Revolving to Term	7,294	7,294	3,462
Total loans	16,248	16,248	11,200
Pass | Commercial | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,826,289	1,826,289	2,388,618
Originated one year before current year	1,573,669	1,573,669	1,754,364
Originated two years before current year	985,964	985,964	796,340
Originated three years before current year	520,883	520,883	738,208
Originated four years before current year	450,911	450,911	362,986
Originated more than five years before current fiscal year	495,979	495,979	388,617
Revolving	2,051,985	2,051,985	1,988,763
Revolving to Term	651,953	651,953	329,119
Total loans	8,557,633	8,557,633	8,747,015
Pass | Commercial real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	2,177,841	2,177,841	3,066,960
Originated one year before current year	3,515,702	3,515,702	2,828,758
Originated two years before current year	2,563,638	2,563,638	1,989,000
Originated three years before current year	1,576,044	1,576,044	1,219,025
Originated four years before current year	1,010,351	1,010,351	675,572
Originated more than five years before current fiscal year	1,161,119	1,161,119	1,018,719
Revolving	103,332	103,332	57,818
Revolving to Term	960,386	960,386	689,553
Total loans	13,068,413	13,068,413	11,545,405
Pass | BBCC | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	81,102	81,102	90,341
Originated one year before current year	64,583	64,583	64,161
Originated two years before current year	44,307	44,307	52,304
Originated three years before current year	38,086	38,086	36,868
Originated four years before current year	27,557	27,557	23,618
Originated more than five years before current fiscal year	19,028	19,028	11,333
Revolving	68,807	68,807	60,016
Revolving to Term	33,361	33,361	18,881
Total loans	376,831	376,831	357,522
Criticized | Commercial | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	20,038	20,038	40,856
Originated one year before current year	90,031	90,031	30,661
Originated two years before current year	19,953	19,953	63,557
Originated three years before current year	36,906	36,906	33,490
Originated four years before current year	25,756	25,756	9,195
Originated more than five years before current fiscal year	47,357	47,357	5,312
Revolving	89,765	89,765	61,036
Revolving to Term	44,348	44,348	4,327
Total loans	374,154	374,154	248,434
Criticized | Commercial real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	69,648	69,648	75,306
Originated one year before current year	69,946	69,946	34,422
Originated two years before current year	68,708	68,708	22,569
Originated three years before current year	27,059	27,059	82,637
Originated four years before current year	52,107	52,107	86,504
Originated more than five years before current fiscal year	95,896	95,896	56,864
Revolving	3,893	3,893	0
Revolving to Term	64,730	64,730	23,282
Total loans	451,987	451,987	381,584
Criticized | BBCC | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	0	0	1,504
Originated one year before current year	0	0	525
Originated two years before current year	857	857	368
Originated three years before current year	700	700	692
Originated four years before current year	1,001	1,001	353
Originated more than five years before current fiscal year	349	349	0
Revolving	2,144	2,144	1,006
Revolving to Term	12,728	12,728	1,603
Total loans	17,779	17,779	6,051
Substandard | Commercial | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	27,271	27,271	37,223
Originated one year before current year	41,164	41,164	47,522
Originated two years before current year	27,990	27,990	16,540
Originated three years before current year	37,618	37,618	22,925
Originated four years before current year	10,461	10,461	4,844
Originated more than five years before current fiscal year	29,981	29,981	21,204
Revolving	72,703	72,703	67,402
Revolving to Term	56,716	56,716	25,143
Total loans	303,904	303,904	242,803
Substandard | Commercial real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	26,638	26,638	46,231
Originated one year before current year	56,423	56,423	16,928
Originated two years before current year	21,401	21,401	24,319
Originated three years before current year	28,983	28,983	78,468
Originated four years before current year	61,186	61,186	57,824
Originated more than five years before current fiscal year	49,558	49,558	21,591
Revolving	0	0	0
Revolving to Term	48,760	48,760	4,108
Total loans	292,949	292,949	249,469
Substandard | BBCC | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	436	436	811
Originated one year before current year	193	193	143
Originated two years before current year	252	252	0
Originated three years before current year	0	0	421
Originated four years before current year	0	0	0
Originated more than five years before current fiscal year	604	604	0
Revolving	15	15	543
Revolving to Term	1,006	1,006	682
Total loans	2,506	2,506	2,600
Nonaccrual | Commercial | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	32	32	3,627
Originated one year before current year	7,034	7,034	1,453
Originated two years before current year	0	0	566
Originated three years before current year	0	0	0
Originated four years before current year	823	823	0
Originated more than five years before current fiscal year	3,411	3,411	0
Revolving	0	0	1,634
Revolving to Term	5,461	5,461	6,623
Total loans	16,761	16,761	13,903
Nonaccrual | Commercial real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	0	0	3,151
Originated one year before current year	21,919	21,919	9,541
Originated two years before current year	10,706	10,706	5,014
Originated three years before current year	1,975	1,975	0
Originated four years before current year	1,634	1,634	2,312
Originated more than five years before current fiscal year	8,632	8,632	22,155
Revolving	0	0	0
Revolving to Term	1,400	1,400	3,257
Total loans	46,266	46,266	45,430
Nonaccrual | BBCC | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	0	0	42
Originated one year before current year	0	0	37
Originated two years before current year	482	482	118
Originated three years before current year	0	0	0
Originated four years before current year	4	4	429
Originated more than five years before current fiscal year	1,105	1,105	284
Revolving	0	0	0
Revolving to Term	1,402	1,402	639
Total loans	2,993	2,993	1,549
Doubtful | Commercial | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	0	0	2,821
Originated one year before current year	7,261	7,261	17,604
Originated two years before current year	5,925	5,925	3,720
Originated three years before current year	4,875	4,875	8,005
Originated four years before current year	1,742	1,742	5,968
Originated more than five years before current fiscal year	7,211	7,211	8,351
Revolving	0	0	0
Revolving to Term	0	0	0
Total loans	27,014	27,014	46,469
Doubtful | Commercial real estate | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	5,360	5,360	1,934
Originated one year before current year	429	429	38,386
Originated two years before current year	30,897	30,897	10,011
Originated three years before current year	2,306	2,306	4,605
Originated four years before current year	37,777	37,777	1,523
Originated more than five years before current fiscal year	35,187	35,187	20,401
Revolving	0	0	0
Revolving to Term	0	0	0
Total loans	111,956	111,956	76,860
Doubtful | BBCC | Portfolio Segment After Reclassifications
Risk Category Of Loans [Line Items]
Originated in current fiscal year	302	302	40
Originated one year before current year	727	727	107
Originated two years before current year	254	254	439
Originated three years before current year	286	286	157
Originated four years before current year	60	60	64
Originated more than five years before current fiscal year	84	84	73
Revolving	0	0	0
Revolving to Term	0	0	0
Total loans	$ 1,713	$ 1,713	$ 880

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 32,991,927	$ 31,123,641
Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	32,991,927	31,123,641
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,512,230	9,508,904
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,279,466	9,298,624
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	14,140,629	12,457,070
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,971,571	12,298,748
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	401,822	368,602
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	523,172	629,186
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	523,172	629,186
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Total Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	133,465	186,223
Total Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	22,321	30,028
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	44,995	81,444
Total Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,479	1,698
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	27,974	40,967
Total Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	10,221	9,378
Total Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	8,678	9,450
Total Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,797	13,258
30-59 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	59,187	104,589
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,128	14,147
30-59 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,081	47,240
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,368	730
30-59 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,358	24,181
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	7,025	6,302
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,436	5,404
30-59 Days Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	7,791	6,585
60-89 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,743	17,713
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,332	4,801
60-89 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,254	1,312
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	134	365
60-89 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	367	5,033
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,854	2,118
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,455	2,118
60-89 Days Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,347	1,966
Past Due 90 Days or More | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	61,535	63,921
Past Due 90 Days or More | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,861	11,080
Past Due 90 Days or More | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	30,660	32,892
Past Due 90 Days or More | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	977	603
Past Due 90 Days or More | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	15,249	11,753
Past Due 90 Days or More | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,342	958
Past Due 90 Days or More | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,787	1,928
Past Due 90 Days or More | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,659	4,707
Current | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	32,858,462	30,937,418
Current | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,257,145	9,268,596
Current | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,926,576	12,217,304
Current | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	399,343	366,904
Current | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,671,469	6,419,474
Current | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,040,761	1,024,879
Current | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	514,494	619,736
Current | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 1,048,674	$ 1,020,525

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	$ 274,821	$ 238,178
Nonaccrual With No Related Allowance	37,650	41,318
Past Due 90 Days or More and Accruing	961	2,650
Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	43,775	60,372
Nonaccrual With No Related Allowance	13,143	7,873
Past Due 90 Days or More and Accruing	242	152
Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	158,222	122,290
Nonaccrual With No Related Allowance	24,507	33,445
Past Due 90 Days or More and Accruing	585	0
BBCC
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	4,706	2,429
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	95	0
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	41,771	34,660
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	0	1,808
Indirect
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	4,207	3,230
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	8	28
Direct
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	5,892	3,997
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	31	133
Home equity
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	16,248	11,200
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	$ 0	$ 529

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Schedule of Types of Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 32,991,927	$ 31,123,641
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	226,996	168,623
Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	25,524	43,245
Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	3,747	4,408
Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	5,243	5,085
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,464	7,414
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	9,512,230	9,508,904
Commercial | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	14,303	8,962
Commercial | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	24,729	42,754
Commercial | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	2,577	2,690
Commercial | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	280	1,611
Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	328	980
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	14,140,629	12,457,070
Commercial real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	146,425	108,871
Commercial real estate | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Commercial real estate | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,167	1,718
Commercial real estate | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Commercial real estate | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,107	6,411
BBCC | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	3,522	1,939
BBCC | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	794	478
BBCC | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
BBCC | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	390	12
BBCC | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Residential real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	41,771	34,660
Residential real estate | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Residential real estate | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Residential real estate | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Residential real estate | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Indirect | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Indirect | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Indirect | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Indirect | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	4,207	3,230
Indirect | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	523,172	629,186
Direct | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	4,727	2,991
Direct | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1	13
Direct | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	3	0
Direct | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	366	232
Direct | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	29	23
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Home equity | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	16,248	11,200
Home equity | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Home equity | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Home equity | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Home equity | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 0	$ 0

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Schedule of Amortized Cost Basis of Loans with Modifications (Details) - Extended Maturity $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Term Extension	$ 143,160
Total Class of Loans	0.40%
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Term Extension	$ 21,631
Total Class of Loans	0.20%
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Term Extension	$ 121,529
Total Class of Loans	0.90%

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Schedule of Monitors the Performance of Loan Modifications to Borrowers Experiencing Financial Difficulty to Understand the Effectiveness of its Modification Efforts (Details) - Extended Maturity - Portfolio Segment After Reclassifications $ in Thousands	Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 143,160
30-59 Days Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,287
60-89 Days Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Past Due 90 Days or More
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Total Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,287
Current
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	137,873
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	21,631
Commercial | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Commercial | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Commercial | Past Due 90 Days or More
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Commercial | Total Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Commercial | Current
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	21,631
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	121,529
Commercial real estate | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,287
Commercial real estate | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Commercial real estate | Past Due 90 Days or More
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0
Commercial real estate | Total Past Due
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,287
Commercial real estate | Current
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 116,242

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Schedule of Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) - Extended Maturity	12 Months Ended
	Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Weighted- Average Term Extension (in months)	8 months 6 days
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Weighted- Average Term Extension (in months)	6 months 3 days
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Weighted- Average Term Extension (in months)	8 months 18 days

Premises and Equipment - Premis

Premises and Equipment - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total	$ 778,123	$ 735,295
Accumulated depreciation	(212,727)	(177,988)
Premises and equipment, net	565,396	557,307
Land
Property, Plant and Equipment [Line Items]
Total	91,568	91,568
Buildings
Property, Plant and Equipment [Line Items]
Total	453,234	419,596
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Total	148,134	154,719
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	$ 85,187	$ 69,412

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Depreciation	$ 38,180	$ 36,436	$ 27,276

Leases - Additional Information

Leases - Additional Information (Details)	Dec. 31, 2023
Minimum
Lessee, Lease, Description [Line Items]
Operating lease term	5 years
Finance lease term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease term	20 years
Finance lease term	20 years

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance lease cost:
Total	$ 34,431	$ 32,007	$ 14,685
Occupancy/Equipment expense
Lessee, Lease, Description [Line Items]
Operating lease cost	31,175	29,368	12,336
Occupancy expense
Finance lease cost:
Amortization of right-of-use assets	2,921	2,672	2,356
Sub-lease income	(387)	(448)	(438)
Interest expense
Finance lease cost:
Interest on lease liabilities	$ 722	$ 415	$ 431

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Operating Leases
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable and other assets	Accrued interest receivable and other assets
Operating lease right-of-use assets	$ 185,506	$ 189,714
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Operating lease liabilities	$ 204,960	$ 211,964
Finance Leases
Premises and equipment, net	19,820	10,799
Other borrowings	$ 20,955	$ 13,469
Finance lease, right-of-use asset, statement of financial position [extensible enumeration]	Premises and equipment, net	Premises and equipment, net
Finance lease, liability, statement of financial position [extensible enumeration]	Other borrowings	Other borrowings
Weighted-Average Remaining Lease Term (in Years)
Operating leases	8 years 6 months	9 years 1 month 6 days
Finance leases	10 years 6 months	7 years 2 months 12 days
Weighted-Average Discount Rate
Operating leases	3.04%	2.88%
Finance leases	3.90%	3.30%

Leases - Schedule of Suppleme_2

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 31,720	$ 30,340	$ 13,823
Operating cash flows from finance leases	722	415	431
Financing cash flows from finance leases	$ 2,533	$ 2,475	$ 2,057

Leases - Schedule of Maturity A

Leases - Schedule of Maturity Analysis of Lease Liability by Lease Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Operating Leases
2024	$ 31,199
2025	30,703
2026	29,972
2027	29,038
2028	25,392
Thereafter	87,940
Total undiscounted lease payments	234,244
Amounts representing interest	(29,284)
Lease liability	204,960	$ 211,964
Finance Leases
2024	3,357
2025	3,380
2026	2,154
2027	2,158
2028	2,056
Thereafter	12,752
Total undiscounted lease payments	25,857
Amounts representing interest	(4,902)
Lease liability	$ 20,955	$ 13,469

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,998,716	$ 1,036,994	$ 1,036,994
Acquisitions and adjustments	0	961,722	0
Balance at end of period	$ 1,998,716	$ 1,998,716	$ 1,036,994

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)		12 Months Ended
	Aug. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Acquisitions and adjustments		$ 0	$ 961,722,000	$ 0
Goodwill impairment	$ 0
Impairment charges		0	0	0
Amortization of other intangible assets		$ 24,155,000	25,857,000	$ 11,336,000
Core Deposits and Other Intangible Assets | Minimum
Goodwill [Line Items]
Estimated useful lives		5 years
Core Deposits and Other Intangible Assets | Maximum
Goodwill [Line Items]
Estimated useful lives		15 years
Core deposit
Goodwill [Line Items]
Estimated fair value of intangible assets acquired			77,900,000
Customer trust relationships
Goodwill [Line Items]
Estimated fair value of intangible assets acquired			39,700,000
First Midwest
Goodwill [Line Items]
Acquisitions and adjustments			$ 961,700,000

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 196,132	$ 226,885
Accumulated Amortization and Impairment	(93,882)	(100,480)
Net Carrying Amount	102,250	126,405
Core deposit
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	143,511	170,642
Accumulated Amortization and Impairment	(72,940)	(80,951)
Net Carrying Amount	70,571	89,691
Customer trust relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52,621	56,243
Accumulated Amortization and Impairment	(20,942)	(19,529)
Net Carrying Amount	$ 31,679	$ 36,714

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2024	$ 21,239
2025	18,358
2026	15,555
2027	12,867
2028	10,356
Thereafter	23,875
Net Carrying Amount	$ 102,250	$ 126,405

Loan Servicing Rights - Additio

Loan Servicing Rights - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Transfers and Servicing [Abstract]
Loan servicing rights	$ 35,789	$ 37,267	$ 30,039
Principal balance of loans serviced for others	4,300,000	4,300,000
Funds held in escrow	27,000	27,000
Fair value of servicing rights	$ 47,100	$ 48,400
Fair value at discount rate	9%	9%
Fair value inputs weighted average prepayment speed	10%	9%

Loan Servicing Rights - Compone

Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Additions	$ 3,657	$ 13,080	$ 11,759
Servicing asset:
Balance at beginning of period	37,267	30,085	28,124
Additions	3,657	13,080	11,759
Amortization	(5,135)	(5,898)	(9,798)
Balance before valuation allowance at end of period	35,789	37,267	30,085
Valuation allowance:
Balance at beginning of period	0	(46)	(1,407)
(Additions)/recoveries	0	46	1,361
Balance at end of period	0	0	(46)
Loan servicing rights, net	$ 35,789	37,267	$ 30,039
First Midwest
Servicing Assets at Fair Value [Line Items]
Additions		7,700
Servicing asset:
Additions		$ 7,700

Qualified Affordable Housing _3

Qualified Affordable Housing Projects and Other Tax Credit Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary of Investment Holdings [Line Items]
Investment	$ 197,139	$ 156,755
Unfunded Commitment	103,402	65,342
Amortization Expense	24,710	15,935	$ 10,220
Tax Expense (Benefit) Recognized	(28,361)	(19,065)	(11,614)
LIHTC
Summary of Investment Holdings [Line Items]
Investment, Proportional amortization	114,991	84,428
Unfunded commitment, Proportional amortization	75,981	55,754
Amortization Expense	9,343	4,974	3,450
Tax Expense (Benefit) Recognized	(10,980)	(6,613)	(4,543)
FHTC
Summary of Investment Holdings [Line Items]
Investment, Equity	34,220	19,316
Unfunded commitment, Equity	27,421	9,588
Amortization Expense	5,487	1,925	2,557
Tax Expense (Benefit) Recognized	(6,186)	(2,227)	(2,884)
NMTC
Summary of Investment Holdings [Line Items]
Investment, Equity	47,727	51,912
Unfunded commitment, Equity	0	0
Amortization Expense	8,982	8,197	2,887
Tax Expense (Benefit) Recognized	(11,195)	(10,225)	(3,625)
Renewable Energy
Summary of Investment Holdings [Line Items]
Investment, Equity	201	1,099
Unfunded commitment, Equity	0	0
Amortization Expense	898	839	1,326
Tax Expense (Benefit) Recognized	$ 0	$ 0	$ (562)

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Total Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Maturities of Time Deposits [Abstract]
Due in 2024	$ 5,081,013
Due in 2025	376,189
Due in 2026	66,853
Due in 2027	33,864
Due in 2028	14,416
Thereafter	6,809
Total	$ 5,579,144	$ 3,013,780

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deposits [Abstract]
Time deposits, meet or exceed FDIC insurance limit of $250,000	$ 1,500	$ 793.4

Securities Sold Under Agreeme_3

Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold under Agreements to Repurchase and Related Weighted-Average Interest Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Securities Sold under Agreements to Repurchase [Abstract]
Outstanding at year-end	$ 285,206	$ 432,804
Average amount outstanding	332,853	440,619
Maximum amount outstanding at any month-end	$ 430,537	$ 509,275
Weighted-average interest rate during year	0.99%	0.19%
Weighted-average interest rate at end of year	3.64%	1.31%

Securities Sold Under Agreeme_4

Securities Sold Under Agreements to Repurchase - Schedule of Remaining Contractual Maturity of Secured Borrowings and Class of Collateral Pledged Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 285,206	$ 432,804
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	285,206
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	285,206
Overnight and Continuous | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	285,206
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	0
Up to 30 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	0
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	0
30-90 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	0
Greater Than 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	0
Greater Than 90 days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 0

Securities Sold Under Agreeme_5

Securities Sold Under Agreements to Repurchase - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023
Securities Sold under Agreements to Repurchase [Abstract]
Gross outstanding balance of repurchase agreements collateralized by securities percentage	115%

Federal Home Loan Bank Advanc_3

Federal Home Loan Bank Advances - Summary of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Federal Home Loan Bank, Advances [Line Items]
FHLB advances (fixed rates 2.19% to 5.51% and    variable rates 5.34% to 5.36%) maturing    January 2024 to December 2043	$ 4,300,528	$ 3,850,677
Fair value hedge basis adjustments and unamortized prepayment fees	(19,847)	(21,659)
Federal Home Loan Bank advances	$ 4,280,681	$ 3,829,018
Minimum | FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Fixed rates	2.19%
Variable rates	5.34%
Maximum | FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Fixed rates	5.51%
Variable rates	5.36%

Federal Home Loan Bank Advanc_4

Federal Home Loan Bank Advances - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Federal Home Loan Bank, Advances [Line Items]
Weighted-average rates of FHLB advances	3.45%	3.15%
Modifications, unamortized prepayment fees	$ 14.2	$ 20.2

Federal Home Loan Bank Advanc_5

Federal Home Loan Bank Advances - Summary of Contractual Maturities of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Due in 2024	$ 125,243
Due in 2025	550,285
Due in 2026	100,000
Due in 2028	850,000
Thereafter	2,675,000
Fair value hedge basis adjustments and unamortized prepayment fees	(19,847)	$ (21,659)
Federal Home Loan Bank advances	$ 4,280,681	$ 3,829,018

Other Borrowings - Other Borrow

Other Borrowings - Other Borrowings (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 01, 2017	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Lease liability		$ 20,955	$ 13,469
Other borrowings		764,870	743,003
Old National Bank
Debt Instrument [Line Items]
Other basis adjustments		97,872	89,588
Lease liability		20,955	13,469
Derivative collateralize position amount		97,600	88,000
Old National Bancorp
Debt Instrument [Line Items]
Other basis adjustments		18,207	23,363
Other borrowings		$ 479,759	484,759
Senior Unsecured Notes | Old National Bancorp
Debt Instrument [Line Items]
Fixed rates		4.125%
Senior unsecured notes (fixed rate 4.125%) maturing August 2024		$ 175,000	175,000
Unamortized debt issuance costs related to senior unsecured notes		$ (91)	(247)
Subordinated Debt | Old National Bank
Debt Instrument [Line Items]
Fixed rates		10.01%
Subordinated debentures		$ 12,000	12,000
Subordinated Debt | Old National Bank | SOFR
Debt Instrument [Line Items]
LIBOR rate	4.618%
Subordinated Debt | Old National Bancorp
Debt Instrument [Line Items]
Fixed rates		5.875%
Subordinated debentures		$ 150,000	150,000
Junior Subordinated Debentures | Old National Bancorp
Debt Instrument [Line Items]
Junior subordinated debentures (rates of 6.95% to 9.22%) maturing    July 2031 to September 2037		136,643	136,643
Leveraged Loans for NMTC | Old National Bank
Debt Instrument [Line Items]
Leveraged loans for NMTC (fixed rates of 1.00% to 1.43%) maturing December 2046 to June 2060		$ 154,284	$ 143,187
Minimum | Junior Subordinated Debentures | Old National Bancorp
Debt Instrument [Line Items]
Variable rates		6.95%
Minimum | Leveraged Loans for NMTC | Old National Bank
Debt Instrument [Line Items]
Fixed rates		1%
Maximum | Junior Subordinated Debentures | Old National Bancorp
Debt Instrument [Line Items]
Variable rates		9.22%
Maximum | Leveraged Loans for NMTC | Old National Bank
Debt Instrument [Line Items]
Fixed rates		1.43%

Other Borrowings - Contractual

Other Borrowings - Contractual Maturities of Other Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Due in 2024	$ 275,263
Due in 2025	14,740
Due in 2026	151,576
Due in 2027	1,636
Due in 2028	1,594
Thereafter	301,683
Unamortized debt issuance costs and other basis adjustments	18,378
Total	$ 764,870	$ 743,003

Other Borrowings - Additional I

Other Borrowings - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Other borrowings	$ 20,955	$ 13,469
Old National Bank
Debt Instrument [Line Items]
Other borrowings	$ 20,955	$ 13,469

Other Borrowings - Summary of T

Other Borrowings - Summary of Terms of Outstanding Junior Subordinated Debentures (Details) - Trust Preferred Securities - Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Issuance Amount	$ 136,643,000
Bridgeview Statutory Trust I
Debt Instrument [Line Items]
Issuance Amount	$ 15,464,000
Rate	9.22%
Bridgeview Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Variable rate	3.58%
Bridgeview Capital Trust II
Debt Instrument [Line Items]
Issuance Amount	$ 15,464,000
Rate	9.01%
Bridgeview Capital Trust II | LIBOR
Debt Instrument [Line Items]
Variable rate	3.35%
First Midwest Capital Trust I
Debt Instrument [Line Items]
Issuance Amount	$ 37,825,000
Rate	6.95%
Fixed rates	6.95%
St. Joseph Capital Trust II
Debt Instrument [Line Items]
Issuance Amount	$ 5,155,000
Rate	7.39%
St. Joseph Capital Trust II | LIBOR
Debt Instrument [Line Items]
Variable rate	1.75%
Northern States Statutory Trust I
Debt Instrument [Line Items]
Issuance Amount	$ 10,310,000
Rate	7.45%
Northern States Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Variable rate	1.80%
Anchor Capital Trust III
Debt Instrument [Line Items]
Issuance Amount	$ 5,000,000
Rate	7.14%
Anchor Capital Trust III | LIBOR
Debt Instrument [Line Items]
Variable rate	1.55%
Great Lakes Statutory Trust II
Debt Instrument [Line Items]
Issuance Amount	$ 6,186,000
Rate	7.05%
Great Lakes Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Variable rate	1.40%
Home Federal Statutory    Trust I
Debt Instrument [Line Items]
Issuance Amount	$ 15,464,000
Rate	7.30%
Home Federal Statutory    Trust I | LIBOR
Debt Instrument [Line Items]
Variable rate	1.65%
Monroe Bancorp Capital    Trust I
Debt Instrument [Line Items]
Issuance Amount	$ 3,093,000
Rate	7.26%
Monroe Bancorp Capital    Trust I | LIBOR
Debt Instrument [Line Items]
Variable rate	1.60%
Tower Capital Trust 3
Debt Instrument [Line Items]
Issuance Amount	$ 9,279,000
Rate	7.33%
Tower Capital Trust 3 | LIBOR
Debt Instrument [Line Items]
Variable rate	1.69%
Monroe Bancorp Statutory    Trust II
Debt Instrument [Line Items]
Issuance Amount	$ 5,155,000
Rate	7.25%
Monroe Bancorp Statutory    Trust II | LIBOR
Debt Instrument [Line Items]
Variable rate	1.60%
Great Lakes Statutory Trust III
Debt Instrument [Line Items]
Issuance Amount	$ 8,248,000
Rate	7.35%
Great Lakes Statutory Trust III | LIBOR
Debt Instrument [Line Items]
Variable rate	1.70%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 5,128,595	$ 3,012,018	$ 2,972,656
Other comprehensive income (loss) before       reclassifications	38,379	(798,735)	(143,515)
Amounts reclassified from AOCI to income	9,234	14,688	(6,631)
Ending Balance	5,562,900	5,128,595	3,012,018
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(786,422)	(2,375)	147,771
Ending Balance	(738,809)	(786,422)	(2,375)
Unrealized Gains and Losses on Available- for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(642,346)	(2,950)	145,335
Other comprehensive income (loss) before       reclassifications	(14,817)	(639,463)	(144,948)
Amounts reclassified from AOCI to income	4,645	67	(3,337)
Ending Balance	(652,518)	(642,346)	(2,950)
Unrealized Gains and Losses on Held-to- Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(112,664)	0	0
Other comprehensive income (loss) before       reclassifications	1,325	(125,229)	0
Amounts reclassified from AOCI to income	15,867	12,565	0
Ending Balance	(95,472)	(112,664)	0
Gains and Losses on Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(31,549)	543	2,584
Other comprehensive income (loss) before       reclassifications	51,871	(34,043)	1,433
Amounts reclassified from AOCI to income	(11,141)	1,951	(3,474)
Ending Balance	9,181	(31,549)	543
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	137	32	(148)
Other comprehensive income (loss) before       reclassifications	0	0	0
Amounts reclassified from AOCI to income	(137)	105	180
Ending Balance	$ 0	$ 137	$ 32

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Debt securities (gains) losses, net	$ 6,265	$ 88	$ (4,327)
Income tax expense (benefit)	(169,310)	(116,446)	(61,324)
Interest income (expense)	(1,503,153)	(1,327,936)	(596,400)
Salaries and employee benefits	546,364	575,626	284,098
Net income	(581,992)	(428,287)	(277,538)
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(9,234)	(14,688)	6,631
Amount Reclassified from AOCI | Unrealized Gains and Losses on Available- for-Sale Debt Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Debt securities (gains) losses, net	(6,265)	(88)	4,327
Income tax expense (benefit)	1,620	21	(990)
Net income	(4,645)	(67)	3,337
Amount Reclassified from AOCI | Amortization of unrealized losses on    held-to-maturity securities transferred    from available-for-sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	5,372	4,047	0
Interest income (expense)	(21,239)	(16,612)	0
Net income	15,867	12,565	0
Amount Reclassified from AOCI | Gains and Losses on Hedges | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	(3,926)	636	(1,131)
Interest income (expense)	15,067	(2,587)	4,605
Net income	11,141	(1,951)	3,474
Amount Reclassified from AOCI | Defined Benefit Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	(45)	34	59
Salaries and employee benefits	182	(139)	(239)
Net income	$ 137	$ (105)	$ (180)

Income Taxes - Summary of Diffe

Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Provision at statutory rate	$ 157,774	$ 114,394	$ 71,161
Tax-exempt income:
Tax-exempt interest	(18,582)	(14,588)	(11,066)
Section 291/265 interest disallowance	2,392	363	114
Company-owned life insurance income	(3,125)	(2,891)	(2,138)
Tax-exempt income	(19,315)	(17,116)	(13,090)
State income taxes	31,164	20,837	9,308
Tax credit investments - federal	(12,190)	(9,140)	(5,212)
Officer compensation limitation	4,685	5,903	564
Non-deductible FDIC premiums	7,912	3,805	438
Other, net	(720)	(2,237)	(1,845)
Income tax expense	$ 169,310	$ 116,446	$ 61,324
Effective tax rate	22.50%	21.40%	18.10%

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current expense:
Federal	$ 121,428	$ 106,918	$ 31,943
State	37,331	32,898	8,461
Deferred expense:
Federal	7,941	(16,216)	17,514
State	2,610	(7,154)	3,406
Deferred income tax expense	10,551	(23,370)	20,920
Income tax expense	$ 169,310	$ 116,446	$ 61,324

Income Taxes - Schedule of Sign

Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets
Unrealized losses on available-for-sale investment securities	$ 217,018	$ 202,101
Allowance for credit losses on loans, net of recapture	86,224	85,619
Operating lease liabilities	57,996	58,288
Unrealized losses on held-to-maturity investment securities	32,150	36,197
Acquired loans	32,011	40,723
Benefit plan accruals	31,679	38,038
Purchase accounting	22,473	20,063
Net operating loss carryforwards	21,004	25,135
FDIC deductible premiums	4,891	0
Unrealized losses on hedges	0	10,277
Other, net	4,860	4,962
Total deferred tax assets	510,306	521,403
Deferred Tax Liabilities
Operating lease right-of-use assets	(52,710)	(51,845)
Premises and equipment	(12,141)	(14,844)
Loan servicing rights	(9,188)	(9,636)
Prepaid expenses	(3,856)	(2,774)
Unrealized gains on hedges	(3,202)	0
Deferred loan origination fees	(2,361)	(3,566)
Other, net	(3,588)	(2,983)
Total deferred tax liabilities	(87,046)	(85,648)
Net deferred tax assets	$ 423,260	$ 435,755

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Bad debt reserves, created for tax purposes		$ 58,600,000
Valuation allowance recorded		0	$ 0
First Midwest
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate		8,000,000
First Midwest | Forecast
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 5,600,000
Federal
Income Taxes [Line Items]
Operating loss carryforwards		63,600,000	81,500,000
State
Income Taxes [Line Items]
Operating loss carryforwards		$ 116,900,000	$ 124,400,000

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - First Midwest - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 11,007	$ 0	$ 0
Additions for acquired uncertain tax positions	0	14,897	0
Additions based on tax positions related to prior years	60	0	0
Reductions for tax positions relating to prior years	0	(2,751)	0
Reductions due to statute of limitations expiring	(1,112)	(1,139)	0
Balance at end of period	$ 9,955	$ 11,007	$ 0

Share-Based Compensation and _3

Share-Based Compensation and Other Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for issuance (in shares)	7,600,000
Increase in number of shares authorized for issuance (in shares)	$ 27,900,000	$ 28,700,000	$ 7,500,000
Total income tax benefit, stock-based compensation cost	6,900,000	7,100,000	1,800,000
Discretionary profit sharing	$ 0	$ 0	0
Shares allocated to the employee stock ownership plan (in shares)	1,100,000	1,200,000
Contribution expense under employee stock ownership plan	$ 20,300,000	$ 17,900,000	9,800,000
Employer Matching Contribution Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contribution plan, employer matching contribution percentage	100%
Defined contribution plans employee contribution percentage of eligible compensation matched by employer	5%
Cliff Vest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	3 years
Unrecognized compensation expense	$ 18,100,000
Expected weighted-average period for cost recognition (in years)	1 year 10 months 24 days
Total fair value of shares vested	$ 15,100,000	$ 7,900,000	$ 4,300,000
Restricted Stock | Second Anniversary of Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	50%
Restricted Stock | Third Anniversary of Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	50%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period	36 months
Unrecognized compensation expense	$ 6,200,000
Expected weighted-average period for cost recognition (in years)	1 year 8 months 12 days
Stock Options | Old National Bancorp
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental expense associated with conversion of stock awards	$ 0
Outside Director Stock Compensation Program | Amended and Restated 2008 Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)	41,000	19,000	25,000

Share-Based Compensation and _4

Share-Based Compensation and Other Employee Benefit Plans - Summary of Changes in the Nonvested Restricted Shares (Details) - Restricted Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Shares
Nonvested balance at beginning of period (in shares)	1,869	554
Granted during the year (in shares)	1,042	1,916
Vested during the year (in shares)	(924)	(453)
Forfeited during the year (in shares)	(55)	(148)
Nonvested balance at end of period (in shares)	1,932	1,869
Weighted Average Grant-Date Fair Value
Nonvested balance at beginning of period (in dollars per share)	$ 17.76	$ 16.16
Granted during the year (in dollars per share)	15.43	18.12
Vested during the year (in dollars per share)	17.80	17.29
Forfeited during the year (in dollars per share)	16.84	17.88
Nonvested balance at end of period (in dollars per share)	$ 16.51	$ 17.76

Share-Based Compensation and _5

Share-Based Compensation and Other Employee Benefit Plans - Summary of Changes in the Nonvested Restricted Stock Units (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restricted Stock Units
Shares
Nonvested balance at beginning of period (in shares)	2,081	886
Granted during the year (in shares)	355	1,935
Vested during the year (in shares)	(1,286)	(720)
Forfeited during the year (in shares)	(8)	(73)
Dividend equivalents adjustment (in shares)	35	53
Nonvested balance at end of period (in shares)	1,177	2,081
Weighted Average Grant-Date Fair Value
Nonvested balance at beginning of period (in dollars per share)	$ 17.23	$ 14.80
Granted during the year (in dollars per share)	18.01	17.66
Vested during the year (in dollars per share)	16.29	15.41
Forfeited during the year (in dollars per share)	17.82	16.73
Dividend equivalents adjustment (in dollars per share)	17.21	16.82
Nonvested balance at end of period (in dollars per share)	$ 17.50	$ 17.23
Restricted Stock
Shares
Nonvested balance at beginning of period (in shares)	1,869	554
Granted during the year (in shares)	1,042	1,916
Vested during the year (in shares)	(924)	(453)
Forfeited during the year (in shares)	(55)	(148)
Nonvested balance at end of period (in shares)	1,932	1,869
Weighted Average Grant-Date Fair Value
Nonvested balance at beginning of period (in dollars per share)	$ 17.76	$ 16.16
Granted during the year (in dollars per share)	15.43	18.12
Vested during the year (in dollars per share)	17.80	17.29
Forfeited during the year (in dollars per share)	16.84	17.88
Nonvested balance at end of period (in dollars per share)	$ 16.51	$ 17.76

Share-Based Compensation and _6

Share-Based Compensation and Other Employee Benefit Plans - Schedule of Information Related to the Stock Option Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Intrinsic value of options/appreciation rights exercised	$ 70	$ 331	$ 171
Tax benefit realized from options/appreciation rights exercises	$ 28	$ 132	$ 68

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 21, 2024	Mar. 31, 2022	Aug. 12, 2021
Shareholders' Equity [Line Items]
Authorized and unissued common shares reserved for issuance (in shares)	600,000,000	600,000,000
Employee stock purchase plan, discount rate	5%
Common shares purchase price as percentage of fair market value	95%
Employee stock purchase maximum purchase at fair market value amount	$ 25
Common stock issued	1,076	$ 809	$ 583
Common stock repurchased	$ 44,308	$ 71,182	$ 3,731
Share Repurchase Program
Shareholders' Equity [Line Items]
Number of shares available for repurchase (up to) (in shares)					200,000,000
Number of shares repurchased (in shares)	1,800,000
Common stock repurchased	$ 29,500
Share Repurchase Program | Subsequent Event
Shareholders' Equity [Line Items]
Number of shares available for repurchase (up to) (in shares)				200,000,000
Share Repurchase Plan Expiring February 28, 2025 | Subsequent Event
Shareholders' Equity [Line Items]
Number of shares available for repurchase (up to) (in shares)				200,000,000
Dividend Reinvestment and Stock Purchase Plan
Shareholders' Equity [Line Items]
Authorized and unissued common shares reserved for issuance (in shares)	3,300,000					3,300,000
Employee Stock Purchase Plan
Shareholders' Equity [Line Items]
Shares issued related to dividend reinvestment and stock purchase plan (in shares)	75,000	52,000
Common stock issued	$ 1,100	$ 800

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 581,992	$ 428,287	$ 277,538
Preferred dividends	(16,135)	(14,118)	0
Net income applicable to common shareholders	$ 565,857	$ 414,169	$ 277,538
Weighted average common shares outstanding:
Weighted average number of common shares outstanding - basic (in shares)	290,748	275,179	165,178
Effect of dilutive securities:
Restricted stock (in shares)	1,107	1,502	729
Stock options (in shares)	0	7	22
Weighted average shares outstanding (in shares)	291,855	276,688	165,929
Basic Net Income Per Share (in dollars per share)	$ 1.95	$ 1.51	$ 1.68
Diluted Net Income Per Share (in dollars per share)	$ 1.94	$ 1.50	$ 1.67

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	$ 80,372	$ 52,507
Derivative assets	166,302	169,001
Derivative liabilities	268,916	380,704
Fair Value on Recurring Basis | Carrying Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	80,372	52,507
Loans held-for-sale	32,006	11,926
Derivative assets	166,302	169,001
Derivative liabilities	268,916	380,704
Fair Value on Recurring Basis | Carrying Value | U.S. Treasury
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	396,733	200,927
Fair Value on Recurring Basis | Carrying Value | U.S. government-sponsored entities and agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	1,231,264	1,175,080
Fair Value on Recurring Basis | Carrying Value | Mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	4,216,560	4,369,902
Fair Value on Recurring Basis | Carrying Value | States and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	535,260	663,852
Fair Value on Recurring Basis | Carrying Value | Pooled trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	11,337	10,811
Fair Value on Recurring Basis | Carrying Value | Other securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	321,901	353,140
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	80,372	52,507
Loans held-for-sale	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	0	0
Loans held-for-sale	32,006	11,926
Derivative assets	166,302	169,001
Derivative liabilities	268,916	380,704
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	0	0
Loans held-for-sale	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. Treasury | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	396,733	200,927
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. Treasury | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. Treasury | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. government-sponsored entities and agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. government-sponsored entities and agencies | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	1,231,264	1,175,080
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | U.S. government-sponsored entities and agencies | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Mortgage-backed securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	4,216,560	4,369,902
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | States and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | States and political subdivisions | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	535,260	663,852
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | States and political subdivisions | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Pooled trust preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Pooled trust preferred securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	11,337	10,811
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Pooled trust preferred securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Other securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	0	0
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Other securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	321,901	353,140
Fair Value on Recurring Basis | Estimate of Fair Value Measurement | Other securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment securities - available-for-sale	$ 0	$ 0

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other real estate owned property write-downs	$ 100	$ 600
Valuation allowance for loan servicing rights with impairments	0	0	$ 46	$ 1,407
Recoveries on loan servicing rights	$ 0	46	1,361
Past due period of mortgage loans held for sale, days	90 days
Interest income for residential loans held for sale	$ 1,200	1,800	$ 1,500
Impaired Commercial and Commercial Real Estate Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Principal amount of impaired commercial and commercial real estate loans	134,300	92,000
Valuation allowance	27,900	21,500
Provision (Release) for Loan Losses	$ (20,500)	$ (20,300)

Fair Value - Assets Measured at

Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Fair Value on Non-recurring Basis - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commercial Real Estate Foreclosed Assets | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 1,669
Commercial Real Estate Foreclosed Assets | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Commercial Real Estate Foreclosed Assets | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Commercial Real Estate Foreclosed Assets | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,669
Commercial | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	11,017	$ 22,562
Commercial | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Commercial | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Commercial | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	11,017	22,562
Commercial real estate | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	95,457	48,026
Commercial real estate | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Commercial real estate | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Commercial real estate | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 95,457	$ 48,026

Fair Value - Quantitative Infor

Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Collateral Dependent Loans | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 11,017	$ 22,562
Collateral Dependent Loans | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 95,457	$ 48,026
Collateral Dependent Loans | Minimum | Discount for type of property, age of appraisal, and current status | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.05	0.10
Collateral Dependent Loans | Minimum | Discount for type of property, age of appraisal, and current status | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.02	0.01
Collateral Dependent Loans | Maximum | Discount for type of property, age of appraisal, and current status | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.37	0.47
Collateral Dependent Loans | Maximum | Discount for type of property, age of appraisal, and current status | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.38	0.26
Collateral Dependent Loans | Weighted Average | Discount for type of property, age of appraisal, and current status | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.27	0.28
Collateral Dependent Loans | Weighted Average | Discount for type of property, age of appraisal, and current status | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.16	0.11
Foreclosed Assets | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 1,669
Foreclosed Assets | Minimum | Discount for type of property, age of appraisal, and current status | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.04
Foreclosed Assets | Maximum | Discount for type of property, age of appraisal, and current status | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.08
Foreclosed Assets | Weighted Average | Discount for type of property, age of appraisal, and current status | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.04

Fair Value - Schedule of Differ

Fair Value - Schedule of Difference between the Aggregate Fair Value and the Aggregate Remaining Principal Balance (Details) - Loans held-for-sale - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Fair Value	$ 32,006	$ 11,926
Difference	621	221
Contractual Principal	$ 31,385	$ 11,705

Fair Value - Changes in Fair Va

Fair Value - Changes in Fair Value for Items Measured at Fair Value Pursuant to Election of the Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Trading Securities and Other Trading Assets [Line Items]
Interest Income	$ 1,503,153	$ 1,327,936	$ 596,400
Interest (Expense)	(703,668)	(126,266)	$ (42,249)
Loans held-for-sale
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other Gains and (Losses)	402	(1,127)
Interest Income	12	10
Interest (Expense)	(14)	(4)
Total Changes in Fair Values Included in Current Period Earnings	$ 400	$ (1,121)

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market,    and other interest-earning investments	$ 1,175,058	$ 728,412
Loans, net	32,684,317	30,819,970
Noninterest-bearing demand deposits	9,664,247	11,930,798
Time deposits	5,579,144	3,013,780
Federal funds purchased and interbank borrowings	390	581,489
Securities sold under agreements to repurchase	285,206	432,804
Federal Home Loan Bank advances	4,280,681	3,829,018
Other borrowings	764,870	743,003
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market,    and other interest-earning investments	1,175,058	728,412
Accrued interest receivable	225,159	190,521
Noninterest-bearing demand deposits	9,664,247	11,930,798
Checking, NOW, savings, and money market    interest-bearing deposits	21,991,789	20,056,252
Time deposits	5,579,144	3,013,780
Federal funds purchased and interbank borrowings	390	581,489
Securities sold under agreements to repurchase	285,206	432,804
Federal Home Loan Bank advances	4,280,681	3,829,018
Other borrowings	764,870	743,003
Accrued interest payable	57,094	19,547
Standby letters of credit	1,318	755
Commitments to extend credit	0	0
Carrying Value | U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	825,953	819,168
Carrying Value | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	1,029,131	1,106,817
Carrying Value | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	1,158,409	1,163,162
Carrying Value | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	9,392,267	9,386,862
Carrying Value | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	13,984,273	12,317,825
Carrying Value | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	6,678,606	6,438,525
Carrying Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,629,171	2,676,758
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market,    and other interest-earning investments	1,175,058	728,412
Accrued interest receivable	859	758
Noninterest-bearing demand deposits	9,664,247	11,930,798
Checking, NOW, savings, and money market    interest-bearing deposits	21,991,789	20,056,252
Time deposits	0	0
Federal funds purchased and interbank borrowings	390	581,489
Securities sold under agreements to repurchase	285,206	432,804
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Standby letters of credit	0	0
Commitments to extend credit	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market,    and other interest-earning investments	0	0
Accrued interest receivable	54,465	52,081
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market    interest-bearing deposits	0	0
Time deposits	5,552,538	2,976,389
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	4,090,954	3,739,780
Other borrowings	755,592	703,156
Accrued interest payable	57,094	19,547
Standby letters of credit	0	0
Commitments to extend credit	0	0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	671,126	656,358
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	881,994	982,963
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	1,048,068	1,004,361
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market,    and other interest-earning investments	0	0
Accrued interest receivable	169,835	137,682
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market    interest-bearing deposits	0	0
Time deposits	0	0
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Standby letters of credit	1,318	755
Commitments to extend credit	3,839	3,666
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	0	0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	0	0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	0	0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	9,258,193	9,066,583
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	13,640,868	11,867,851
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	5,579,999	5,372,491
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 2,555,121	$ 2,557,115

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Percentage of periodic changes in fair value qualifies for hedge accounting treatment	100%
Interest Income
Derivative [Line Items]
Hedge gain to be reclassified during next twelve months, net	$ 6,100
Interest Expense
Derivative [Line Items]
Hedge gain to be reclassified during next twelve months, net	20,600
Interest rate swaps on borrowings | Cash flow hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	150,000	$ 150,000
Interest rate swaps on borrowings | Fair value hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	900,000	300,000
Interest rate collars and floors on loan pools | Cash flow hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	1,600,000	1,900,000
Interest rate swaps on investment securities | Fair value hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	998,107	909,957
Interest rate lock commitments | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Notional amount	25,151	21,401
Forward mortgage loan contracts | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Notional amount	39,529	30,330
Counterparty interest rate swaps | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Notional amount	5,954,216	5,220,363
Customer interest rate swaps | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Notional amount	$ 5,954,216	$ 5,220,363

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Designated as Hedging Instrument
Derivative [Line Items]
Net amount presented in the Consolidated Balance Sheet	$ 10,472	$ 11,764
Net amount presented in the Consolidated Balance Sheet	6,014	47,859
Designated as Hedging Instrument | Cash flow hedges | Interest rate collars and floors on loan pools
Derivative [Line Items]
Notional	1,600,000	1,900,000
Net amount presented in the Consolidated Balance Sheet	10,472	11,764
Net amount presented in the Consolidated Balance Sheet	6,014	47,859
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps on borrowings
Derivative [Line Items]
Notional	150,000	150,000
Net amount presented in the Consolidated Balance Sheet	0	0
Net amount presented in the Consolidated Balance Sheet	0	0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on borrowings
Derivative [Line Items]
Notional	900,000	300,000
Net amount presented in the Consolidated Balance Sheet	0	0
Net amount presented in the Consolidated Balance Sheet	0	0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on investment securities
Derivative [Line Items]
Notional	998,107	909,957
Net amount presented in the Consolidated Balance Sheet	0	0
Net amount presented in the Consolidated Balance Sheet	0	0
Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Net amount presented in the Consolidated Balance Sheet	155,830	157,237
Net amount presented in the Consolidated Balance Sheet	262,902	332,845
Derivatives Not Designated as Hedging Instruments | Interest rate lock commitments
Derivative [Line Items]
Notional	25,151	21,401
Net amount presented in the Consolidated Balance Sheet	291	93
Net amount presented in the Consolidated Balance Sheet	0	0
Derivatives Not Designated as Hedging Instruments | Forward mortgage loan contracts
Derivative [Line Items]
Notional	39,529	30,330
Net amount presented in the Consolidated Balance Sheet	0	32
Net amount presented in the Consolidated Balance Sheet	566	0
Derivatives Not Designated as Hedging Instruments | Customer interest rate swaps
Derivative [Line Items]
Notional	5,954,216	5,220,363
Net amount presented in the Consolidated Balance Sheet	33,182	5,676
Net amount presented in the Consolidated Balance Sheet	228,750	326,924
Derivatives Not Designated as Hedging Instruments | Counterparty interest rate swaps
Derivative [Line Items]
Notional	5,954,216	5,220,363
Net amount presented in the Consolidated Balance Sheet	121,969	151,111
Net amount presented in the Consolidated Balance Sheet	33,346	5,711
Derivatives Not Designated as Hedging Instruments | Customer foreign currency forward contracts
Derivative [Line Items]
Notional	12,455	8,341
Net amount presented in the Consolidated Balance Sheet	320	253
Net amount presented in the Consolidated Balance Sheet	59	42
Derivatives Not Designated as Hedging Instruments | Counterparty foreign currency forward contracts
Derivative [Line Items]
Notional	12,308	8,297
Net amount presented in the Consolidated Balance Sheet	68	72
Net amount presented in the Consolidated Balance Sheet	$ 181	$ 168

Derivative Financial Instrume_5

Derivative Financial Instruments - Schedule of Effect of Derivative Instruments on the Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income on Derivative	$ 69,276	$ (45,132)	$ 1,898
Gain (Loss) Reclassified from AOCI into Income	15,067	(2,587)	4,605
Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	11	(1,487)	(4,271)
Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(54,394)	151,496	(11,069)
Gain (Loss) Recognized in Income on Related Hedged Items	53,832	(151,846)	11,250
Interest rate swaps on borrowings | Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(1,769)	(6,245)	(6,413)
Gain (Loss) Recognized in Income on Related Hedged Items	1,684	6,585	6,296
Interest rate swaps on investment securities | Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(52,625)	157,741	(4,656)
Gain (Loss) Recognized in Income on Related Hedged Items	52,148	(158,431)	4,954
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income on Derivative	28,029	(45,132)	1,898
Gain (Loss) Reclassified from AOCI into Income	11,621	(2,587)	4,605
Interest rate contracts | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	457	883	279
Mortgage contracts | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(401)	(2,468)	(4,446)
Foreign currency contracts | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ (45)	$ 98	$ (104)

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Offsetting Assets and Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Gross amounts recognized	$ 166,302	$ 169,001
Less: amounts offset in the Consolidated Balance Sheet	0	0
Net amount presented in the Consolidated Balance Sheet	166,302	169,001
Offsetting derivative positions	(39,360)	(54,054)
Cash collateral pledged	0	(418)
Net credit exposure	126,942	114,529
Liabilities
Gross amounts recognized	268,916	380,704
Less: amounts offset in the Consolidated Balance Sheet	0	0
Net amount presented in the Consolidated Balance Sheet	268,916	380,704
Offsetting derivative positions	(39,360)	(54,054)
Cash collateral pledged	(97,840)	(88,860)
Net credit exposure	$ 131,716	$ 237,790

Commitments, Contingencies, a_3

Commitments, Contingencies, and Financial Guarantees - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Term of standby letters of credit, years		1 year
Percent of unfunded loan commitments with fixed rates		4%
Loan commitments floating rate, minimum		2.10%
Loan commitments floating rate, maximum		22.49%
Allowance for unfunded loan commitments	$ 31,200,000	$ 31,200,000	$ 32,200,000
Visa
Loss Contingencies [Line Items]
Investment owned, balance, shares (in shares)	65,466	65,466
Realized gain (loss)	$ 21,600,000
Investment owned, at cost	0	$ 0
Interest Rate Swap
Loss Contingencies [Line Items]
Notional	$ 557,800,000	$ 557,800,000	$ 398,900,000

Commitments, Contingencies, a_4

Commitments, Contingencies, and Financial Guarantees - Loan Commitments and Standby Letters of Credit (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Unfunded loan commitments	$ 8,912,587	$ 8,979,334
Standby letters of credit	192,237	174,070
Carrying value of letters of credit	$ 1,300	$ 800

Regulatory Restrictions - Addit

Regulatory Restrictions - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract]
Cash and due from banks held as collateral	$ 0.3	$ 0.1
Dividend approval threshold, years	2 years	2 years	2 years
Dividend payments without regulatory approval	$ 670.4

Regulatory Restrictions - Sched

Regulatory Restrictions - Schedule of Capital Ratios (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Old National Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets actual, amount	$ 4,727,216	$ 4,321,716
Common equity Tier 1 capital to risk-weighted assets actual, amount	4,003,694	3,605,393
Tier 1 capital to risk-weighted assets actual, amount	4,247,413	3,849,112
Tier 1 capital to average assets actual, amount	$ 4,247,413	$ 3,849,112
Total capital to risk-weighted assets actual, ratio	0.1264	0.1202
Common equity Tier 1 capital to risk-weighted assets actual, ratio	10.70%	10.03%
Tier 1 capital to risk-weighted assets actual, ratio	0.1135	0.1071
Tier 1 capital to average assets actual, ratio	0.0883	0.0852
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	$ 3,927,771	$ 3,774,845
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	2,618,514	2,516,563
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	3,179,625	3,055,827
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount	$ 1,923,360	$ 1,808,108
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio	0.1050	0.1050
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio	7%	7%
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio	0.0850	0.0850
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, ratio	0.0400	0.0400
Total capital to risk-weighted assets well capitalized guidelines, amount	$ 3,740,735	$ 3,595,090
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount	$ 2,244,441	$ 2,157,054
Total capital to risk-weighted assets well capitalized guidelines, ratio	0.1000	0.1000
Tier 1 capital to risk-weighted assets well capitalized guidelines, ratio	0.0600	0.0600
Old National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets actual, amount	$ 4,591,734	$ 4,063,363
Common equity Tier 1 capital to risk-weighted assets actual, amount	4,308,574	3,817,402
Tier 1 capital to risk-weighted assets actual, amount	4,308,574	3,817,402
Tier 1 capital to average assets actual, amount	$ 4,308,574	$ 3,817,402
Total capital to risk-weighted assets actual, ratio	0.1233	0.1135
Common equity Tier 1 capital to risk-weighted assets actual, ratio	11.57%	10.66%
Tier 1 capital to risk-weighted assets actual, ratio	0.1157	0.1066
Tier 1 capital to average assets actual, ratio	0.0899	0.0847
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	$ 3,911,089	$ 3,759,671
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	2,607,393	2,506,448
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	3,166,120	3,043,544
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount	$ 1,916,002	$ 1,803,426
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio	0.1050	0.1050
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio	7%	7%
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, ratio	0.0850	0.0850
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, ratio	0.0400	0.0400
Total capital to risk-weighted assets well capitalized guidelines, amount	$ 3,724,847	$ 3,580,639
Common equity Tier 1 capital to risk-weighted assets well capitalized guidelines, amount	2,421,150	2,327,416
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount	2,979,878	2,864,512
Tier 1 capital to average assets well capitalized guidelines, amount	$ 2,395,003	$ 2,254,282
Total capital to risk-weighted assets well capitalized guidelines, ratio	0.1000	0.1000
Common equity Tier 1 capital to risk-weighted assets well capitalized guidelines, ratio	6.50%	6.50%
Tier 1 capital to risk-weighted assets well capitalized guidelines, ratio	0.0800	0.0800
Tier 1 capital to average assets well capitalized guidelines, ratio	0.0500	0.0500

Parent Company Financial Stat_3

Parent Company Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Equity securities, at fair value	$ 80,372	$ 52,507
Investment in affiliates:
Goodwill	1,998,716	1,998,716	$ 1,036,994	$ 1,036,994
Total assets	49,089,836	46,763,372
Liabilities and Shareholders’ Equity
Other borrowings	764,870	743,003
Shareholders’ equity	5,562,900	5,128,595	$ 3,012,018	$ 2,972,656
Total liabilities and shareholders’ equity	49,089,836	46,763,372
Old National Bancorp
Assets
Deposits in affiliate bank	284,294	418,959
Equity securities, at fair value	51,241	30,717
Investment securities - available-for-sale	15,886	16,814
Investment in affiliates:
Banking subsidiaries	5,530,637	5,000,153
Non-banks	44,395	44,938
Goodwill	59,506	59,506
Accrued interest receivable and other assets	127,540	135,025
Total assets	6,113,499	5,706,112
Liabilities and Shareholders’ Equity
Other liabilities	70,840	92,758
Other borrowings	479,759	484,759
Shareholders’ equity	5,562,900	5,128,595
Total liabilities and shareholders’ equity	$ 6,113,499	$ 5,706,112

Parent Company Financial Stat_4

Parent Company Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Expense
Interest on borrowings	$ 703,668	$ 126,266	$ 42,249
Other expenses	79,123	76,510	31,697
Income before income taxes	751,302	544,733	338,862
Income tax expense (benefit)	169,310	116,446	61,324
Net income	581,992	428,287	277,538
Preferred dividends	(16,135)	(14,118)	0
Net income applicable to common shareholders	565,857	414,169	277,538
Old National Bancorp
Income
Other income	2,919	1,733	3,364
Total income	152,924	1,738	128,369
Expense
Interest on borrowings	20,700	16,662	8,285
Other expenses	43,185	37,629	13,951
Total expense	63,885	54,291	22,236
Income before income taxes	89,039	(52,553)	106,133
Income tax expense (benefit)	(11,325)	(9,901)	(5,113)
Income (loss) before equity in undistributed    earnings of affiliates	100,364	(42,652)	111,246
Equity in undistributed earnings of affiliates	481,628	470,939	166,292
Net income	581,992	428,287	277,538
Preferred dividends	(16,135)	(14,118)	0
Net income applicable to common shareholders	565,857	414,169	277,538
Old National Bancorp | Investment, Affiliated Issuer
Income
Dividends from affiliates	150,000	0	125,000
Other income	$ 5	$ 5	$ 5

Parent Company Financial Stat_5

Parent Company Financial Statements - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities
Net income	$ 581,992	$ 428,287	$ 277,538
Adjustments to reconcile net income to cash    provided by operating activities:
Depreciation	38,180	36,436	27,276
Share-based compensation expense	27,910	28,656	7,497
(Increase) decrease in other assets	(66,070)	(40,518)	2,641
Increase (decrease) in other liabilities	(79,885)	327,369	17,984
Net cash flows provided by (used in) operating activities	516,342	814,425	330,380
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	0	1,912,629	0
Proceeds from sales of investment securities available-for-sale	96,506	20,032	198,886
Proceeds from sales of equity securities	24,636	53,029	544
Purchases of equity securities	(28,408)	(6,348)	(11,000)
Purchases of investment securities	(1,084,416)	(1,438,572)	(3,321,653)
Purchases of premises and equipment	(38,375)	(37,901)	(48,692)
Net cash flows provided by (used in) investing activities	(1,818,876)	(1,685,507)	(1,431,583)
Cash Flows From Financing Activities
Common stock repurchased	(44,308)	(71,182)	(3,731)
Common stock issued	1,076	809	583
Net cash flows provided by (used in) financing activities	1,749,180	777,475	1,333,510
Net increase (decrease) in cash and cash equivalents	446,646	(93,607)	232,307
Cash and cash equivalents at beginning of period	728,412	822,019	589,712
Cash and cash equivalents at end of period	1,175,058	728,412	822,019
Old National Bancorp
Cash Flows From Operating Activities
Net income	581,992	428,287	277,538
Adjustments to reconcile net income to cash    provided by operating activities:
Depreciation	18	26	30
Share-based compensation expense	27,910	28,656	7,497
(Increase) decrease in other assets	(19,353)	(40,620)	10,213
Increase (decrease) in other liabilities	(2,561)	10,455	(4,918)
Equity in undistributed earnings of affiliates	(481,628)	(470,939)	(166,292)
Net cash flows provided by (used in) operating activities	106,378	(44,135)	124,068
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	0	573,099	0
Proceeds from sales of investment securities available-for-sale	0	0	1,000
Proceeds from sales of equity securities	0	44,038	540
Purchases of equity securities	(17,773)	0	0
Purchases of investment securities	0	(9,000)	(15)
Purchases of premises and equipment	(8)	0	(3)
Net cash flows provided by (used in) investing activities	(17,781)	608,137	1,522
Cash Flows From Financing Activities
Cash dividends paid	(180,030)	(177,623)	(92,829)
Common stock repurchased	(44,308)	(71,182)	(3,731)
Common stock issued	1,076	809	583
Net cash flows provided by (used in) financing activities	(223,262)	(247,996)	(95,977)
Net increase (decrease) in cash and cash equivalents	(134,665)	316,006	29,613
Cash and cash equivalents at beginning of period	418,959	102,953	73,340
Cash and cash equivalents at end of period	$ 284,294	$ 418,959	$ 102,953

Segment Information (Details)

Segment Information (Details)	12 Months Ended
	Dec. 31, 2023 segment
Community Banking Segment
Segment Reporting Information [Line Items]
Number of reportable operating segment	1