Old National Bancorp (ONB) 10-K 22 Feb 23 2022 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2022	Jan. 31, 2023	Jun. 30, 2022
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
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
Entity Shell Company	false
Entity Public Float			$ 4,281,188,738
Entity Common Stock, Shares Outstanding (in shares)		292,923,000
Documents Incorporated by Reference	Portions of the Proxy Statement for the 2023 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2022
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, 2022
Audit Information [Abstract]
Auditor Firm ID	173
Auditor Name	Crowe LLP
Auditor Location	Louisville, Kentucky

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 453,432,000	$ 172,663,000
Money market and other interest-earning investments	274,980,000	649,356,000
Total cash and cash equivalents	728,412,000	822,019,000
Equity securities, at fair value	52,507,000	13,211,000
Investment securities - available-for-sale, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	6,773,712,000	7,382,066,000
Investment securities - held-to-maturity, at amortized cost (fair value $2,643,682 and $0, respectively)	3,089,147,000	0
Federal Home Loan Bank/Federal Reserve Bank stock, at cost	314,168,000	169,375,000
Loans held for sale, at fair value	11,926,000	35,458,000
Loans:
Total loans, net of unearned income	31,123,641,000	13,601,846,000
Allowance for credit losses on loans	(303,671,000)	(107,341,000)
Net loans	30,819,970,000	13,494,505,000
Premises and equipment, net	557,307,000	476,186,000
Operating lease right-of-use assets	189,714,000	69,560,000
Accrued interest receivable	190,521,000	84,109,000
Goodwill	1,998,716,000	1,036,994,000
Other intangible assets	126,405,000	34,678,000
Company-owned life insurance	768,552,000	463,324,000
Other assets	1,142,315,000	372,079,000
Total assets	46,763,372,000	24,453,564,000
Deposits:
Noninterest-bearing demand	11,930,798,000	6,303,106,000
Interest-bearing:
Checking and NOW	8,340,955,000	5,338,022,000
Savings	6,326,158,000	3,798,494,000
Money market	5,389,139,000	2,169,160,000
Time deposits	3,013,780,000	960,413,000
Total deposits	35,000,830,000	18,569,195,000
Federal funds purchased and interbank borrowings	581,489,000	276,000
Securities sold under agreements to repurchase	432,804,000	392,275,000
Federal Home Loan Bank advances	3,829,018,000	1,886,019,000
Other borrowings	743,003,000	296,670,000
Operating lease liabilities	211,964,000	76,236,000
Accrued expenses and other liabilities	835,669,000	220,875,000
Total liabilities	41,634,777,000	21,441,546,000
Commitments and contingencies (Note 20)
Shareholders' Equity
Preferred stock, 2,000 shares authorized, 231 and 0 shares issued and outstanding, respectively	230,500,000	0
Common stock, $1.00 per share stated value, 600,000 shares authorized, 292,903    and 165,838 shares issued and outstanding, respectively	292,903,000	165,838,000
Capital surplus	4,174,265,000	1,880,545,000
Retained earnings	1,217,349,000	968,010,000
Accumulated other comprehensive income (loss), net of tax	(786,422,000)	(2,375,000)
Total shareholders' equity	5,128,595,000	3,012,018,000
Total liabilities and shareholders' equity	46,763,372,000	24,453,564,000
Commercial
Loans:
Total loans, net of unearned income	9,508,904,000	3,391,769,000
Allowance for credit losses on loans	(120,612,000)	(27,232,000)
Commercial real estate
Loans:
Total loans, net of unearned income	12,457,070,000	6,380,674,000
Allowance for credit losses on loans	(138,244,000)	(64,004,000)
Residential real estate
Loans:
Total loans, net of unearned income	6,460,441,000	2,255,289,000
Allowance for credit losses on loans	(21,916,000)	(9,347,000)
Consumer credit, net of unearned income
Loans:
Total loans, net of unearned income	$ 2,697,226,000	$ 1,574,114,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Investment securities-available-for-sale, fair value	$ 7,772,603	$ 7,384,033
Available-for-sale, amortized cost	7,772,603	7,384,033
Investment securities-held-to-maturity, fair value	$ 2,643,682	$ 0
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	231,000	0
Preferred stock, shares outstanding (in shares)	231,000	0
Common stock, stated value (in dollars per share)	$ 1	$ 1
Authorized and unissued common shares reserved for issuance (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	292,903,000	292,903,000
Common stock, shares outstanding (in shares)	165,838,000	165,838,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans including fees:
Taxable	$ 1,177,816	$ 490,042	$ 515,980
Nontaxable	25,931	12,392	13,908
Investment securities:
Taxable	204,004	98,031	98,953
Nontaxable	43,637	37,595	33,899
Money market and other interest-earning investments	2,814	589	568
Total interest income	1,454,202	638,649	663,308
Interest Expense
Deposits	49,093	10,954	28,169
Federal funds purchased and interbank borrowings	5,021	0	1,296
Securities sold under agreements to repurchase	843	397	854
Federal Home Loan Bank advances	51,524	21,075	27,274
Other borrowings	19,785	9,823	9,621
Total interest expense	126,266	42,249	67,214
Net interest income	1,327,936	596,400	596,094
Provision for credit losses	144,799	(29,622)	42,879
Net interest income after provision for credit losses	1,183,137	626,022	553,215
Noninterest Income
Wealth management fees	69,102	40,409	36,806
Service charges on deposit accounts	72,501	31,658	32,557
Debit card and ATM fees	40,227	23,766	22,702
Mortgage banking revenue	23,015	42,558	62,775
Investment product fees	31,749	24,639	21,614
Capital markets income	25,986	21,997	22,480
Company-owned life insurance	14,564	10,589	12,031
Debt securities gains (losses), net	(88)	4,327	10,767
Gain on sale of health savings accounts	90,673	0	0
Other income	32,050	14,276	17,542
Total noninterest income	399,779	214,219	239,274
Noninterest Expense
Salaries and employee benefits	575,626	284,098	293,590
Occupancy	100,421	54,834	55,316
Equipment	27,637	16,704	16,690
Marketing	32,264	12,684	10,874
Data processing	84,865	47,047	41,086
Communication	18,846	10,073	9,731
Professional fees	39,046	20,077	15,755
FDIC assessment	19,332	6,059	6,722
Amortization of intangibles	25,857	11,336	14,091
Amortization of tax credit investments	10,961	6,770	18,788
Property optimization	26,818	0	27,050
Other expense	76,510	31,697	27,240
Total noninterest expense	1,038,183	501,379	536,933
Income before income taxes	544,733	338,862	255,556
Income tax expense	116,446	61,324	29,147
Net income	428,287	277,538	226,409
Preferred dividends	(14,118)	0	0
Net income applicable to common shareholders	$ 414,169	$ 277,538	$ 226,409
Net income per common share - basic (in dollars per share)	$ 1.51	$ 1.68	$ 1.37
Net income per common share - diluted (in dollars per share)	$ 1.50	$ 1.67	$ 1.36
Weighted average number of common shares outstanding - basic (in shares)	275,179	165,178	165,509
Weighted average number of common shares outstanding - diluted (in shares)	276,688	165,929	166,177
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 428,287	$ 277,538	$ 226,409
Change in debt securities available-for-sale:
Unrealized holding gains (losses) for the period	(1,004,054)	(187,955)	125,214
Reclassification for securities transferred to held-to-maturity	165,473	0	0
Reclassification adjustment for securities (gains) losses realized in income	88	(4,327)	(10,767)
Income tax effect	199,097	43,997	(25,243)
Unrealized gains (losses) on available-for-sale debt securities	(639,396)	(148,285)	89,204
Change in securities held-to-maturity:
Adjustment for securities transferred from available-for-sale	(165,473)	0	0
Amortization of unrealized losses on securities transferred     from available-for-sale	16,612	0	0
Income tax effect	36,197	0	0
Changes from securities held-to-maturity	(112,664)	0	0
Change in cash flow hedges:
Net unrealized derivative gains (losses) on cash flow hedges	(45,132)	1,898	8,261
Reclassification adjustment for (gains) losses realized in net income	2,587	(4,605)	(5,153)
Income tax effect	10,453	666	(764)
Changes from cash flow hedges	(32,092)	(2,041)	2,344
Change in defined benefit pension plans:
Amortization of net (gains) losses recognized in income	139	239	21
Income tax effect	(34)	(59)	(5)
Changes from defined benefit pension plans	105	180	16
Other comprehensive income (loss), net of tax	(784,047)	(150,146)	91,564
Comprehensive income (loss)	$ (355,760)	$ 127,392	$ 317,973

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Adjustment	Adjusted Balance	Preferred Stock	Common Stock	Common Stock Adjusted Balance	Capital Surplus	Capital Surplus Adjusted Balance	Retained Earnings	Retained Earnings Adjustment	Retained Earnings Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Adjusted Balance
Beginning Balance at Dec. 31, 2019	$ 2,852,453	$ (31,150)	$ 2,821,303	$ 0	$ 169,616	$ 169,616	$ 1,944,445	$ 1,944,445	$ 682,185	$ (31,150)	$ 651,035	$ 56,207	$ 56,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	226,409								226,409
Other comprehensive income (loss)	91,564											91,564
Cash dividends:
Dividends - common stock	(92,946)								(92,946)
Common stock issued	577				43		534
Common stock repurchased	(82,358)				(5,115)		(77,243)
Share-based compensation expense	7,707						7,707
Stock activity under incentive compensation plans	400				823		183		(606)
Ending Balance at Dec. 31, 2020	2,972,656			0	165,367		1,875,626		783,892			147,771
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	277,538								277,538
Other comprehensive income (loss)	(150,146)											(150,146)
Cash dividends:
Dividends - common stock	(92,829)								(92,829)
Common stock issued	583				35		548
Common stock repurchased	(3,731)				(208)		(3,523)
Share-based compensation expense	7,497						7,497
Stock activity under incentive compensation plans	450				644		397		(591)
Ending Balance at Dec. 31, 2021	3,012,018			0	165,838		1,880,545		968,010			(2,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	428,287								428,287
Other comprehensive income (loss)	(784,047)											(784,047)
First Midwest Bancorp, Inc. merger:
Issuance of common stock	2,446,312				129,365		2,316,947
Issuance of preferred stock, net of issuance costs	243,719			230,500			13,219
Cash dividends:
Dividends - common stock	(163,505)								(163,505)
Preferred dividends	(14,118)								(14,118)
Common stock issued	809				52		757
Common stock repurchased	(71,182)				(3,960)		(67,222)
Share-based compensation expense	28,656						28,656
Stock activity under incentive compensation plans	1,646				1,608		1,363		(1,325)
Ending Balance at Dec. 31, 2022	$ 5,128,595			$ 230,500	$ 292,903		$ 4,174,265		$ 1,217,349			$ (786,422)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends per common share (in dollars per share)	$ 0.56	$ 0.56	$ 0.56

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities
Net income	$ 428,287	$ 277,538	$ 226,409
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	36,436	27,276	28,911
Amortization of other intangible assets	25,857	11,336	14,091
Amortization of tax credit investments	10,961	6,770	18,788
Net premium amortization on investment securities	18,684	16,305	18,798
Accretion income related to acquired loans	(72,007)	(16,747)	(23,331)
Share-based compensation expense	28,656	7,497	7,707
Provision for credit losses	144,799	(29,622)	42,879
Debt securities (gains) losses, net	88	(4,327)	(10,767)
Gain on sale of health savings accounts business	(90,673)	0	0
Net (gains) losses on sales of loans and other assets	13,114	(36,677)	(23,787)
Increase in cash surrender value of company-owned life insurance	(14,564)	(10,589)	(12,031)
Residential real estate loans originated for sale	(570,111)	(1,215,015)	(1,432,488)
Proceeds from sales of residential real estate loans	620,958	1,274,812	1,455,067
(Increase) decrease in interest receivable	(52,911)	1,198	(183)
(Increase) decrease in other assets	(40,518)	2,641	(105,969)
Increase (decrease) in accrued expenses and other liabilities	327,369	17,984	15,726
Net cash flows provided by (used in) operating activities	814,425	330,380	219,820
Cash Flows From Investing Activities
Cash received (paid) from merger, net	1,912,629	0	0
Sale of health savings accounts	(290,857)	0	0
Purchases of investment securities available-for-sale	(1,438,572)	(3,321,653)	(2,803,406)
Purchases of investment securities held-to-maturity	(170,675)	0	0
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock	(147,394)	0	(10,025)
Purchases of equity securities	(6,348)	(11,000)	0
Proceeds from maturities, prepayments, and calls of investment securities    available-for-sale	1,284,814	1,511,510	1,990,383
Proceeds from sales of investment securities available-for-sale	20,032	198,886	299,885
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity	83,962	0	0
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock	108,698	58	4,691
Proceeds from sales of equity securities	53,029	544	39,296
Loan originations and payments, net	(3,071,765)	206,145	(1,644,119)
Proceeds from company-owned life insurance death benefits	10,361	3,375	4,888
Proceeds from sale of premises and equipment and other assets	4,480	29,244	7,826
Purchases of premises and equipment and other assets	(37,901)	(48,692)	(30,871)
Net cash flows provided by (used in) investing activities	(1,685,507)	(1,431,583)	(2,141,452)
Net increase (decrease) in:
Deposits	(435,717)	1,531,742	2,484,056
Federal funds purchased and interbank borrowings	581,213	(890)	(349,248)
Securities sold under agreements to repurchase	(94,665)	(38,891)	103,384
Other borrowings	177,146	36,187	4,171
Payments for maturities of Federal Home Loan Bank advances	(2,102,506)	(146,505)	(751,505)
Payments for modification of Federal Home Loan Bank advances	0	(2,156)	(31,124)
Proceeds from Federal Home Loan Bank advances	2,900,000	50,000	950,000
Cash dividends paid	(177,623)	(92,829)	(92,946)
Common stock repurchased	(71,182)	(3,731)	(82,358)
Common stock issued	809	583	577
Net cash flows provided by (used in) financing activities	777,475	1,333,510	2,235,007
Net increase (decrease) in cash and cash equivalents	(93,607)	232,307	313,375
Cash and cash equivalents at beginning of period	822,019	589,712	276,337
Cash and cash equivalents at end of period	$ 728,412	$ 822,019	$ 589,712

Nature of Operations

Nature of Operations	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	NATURE OF OPERATIONSOld National Bancorp, a financial holding company headquartered in Evansville, Indiana with commercial and consumer banking operations headquartered in Chicago, Illinois.  Its principal subsidiary is Old National Bank.  Through its bank and non-bank affiliates, Old National Bancorp provides to its clients

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
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 significant 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. 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. Expected credit loss inherent in non-cancelable off-balance-sheet credit exposures is accounted for as a separate liability included in other liabilities on the balance sheet. 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. Old National has made a policy election to report accrued interest receivable as a separate line item on the balance sheet. The allowance for credit loss estimation process involves procedures to 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. Evaluations of the overall loan portfolio in future periods, 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 agreements that are commonly referred to as TBA (to be announced) forward agreements and 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. 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. 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) 2022 2021 2020 Cash payments: Interest $ 118,165 $ 42,196 $ 70,043 Income taxes, net of refunds 66,109 31,875 24,436 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 16,661 Operating lease right-of-use assets obtained in exchange for lease obligations 28,265 776 (116) Finance lease right-of-use assets obtained in exchange for lease obligations (966) 7,477 5,225 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 management 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. 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. Investment product fees : Investment product fees are the commissions and fees received from a registered broker/dealer and investment adviser 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. Impact of Accounting Changes Accounting Guidance Adopted in 2022 FASB ASC 470 and 815 – In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , to clarify the accounting for certain financial instruments with characteristics of liabilities and equity. The amendments in this update reduce the number of accounting models for convertible debt instruments and convertible preferred stock by removing the cash conversion model and the beneficial conversion feature model. In addition, this ASU improves disclosure requirements for convertible instruments and earnings-per-share guidance. The amendments in this update are effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. The adoption of this guidance on January 1, 2022 did not have a material impact on the consolidated financial statements. FASB ASC 842 – In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors—Certain Leases with Variable Lease Payments , to amend the lease classification requirements for lessors to align them with practice under ASC Topic 840. The amendments in this update are effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. The adoption of this guidance on January 1, 2022 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 recognizin

Merger, Acquisition, and Divest

Merger, Acquisition, and Divestiture Activity	12 Months Ended
	Dec. 31, 2022
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. Following the merger, the new organization is operating under the Old National Bancorp and Old National Bank names, with the corporate headquarters and principal office located in Evansville, Indiana and commercial and consumer banking operations headquartered in Chicago, Illinois. Old National believes that it will be able to achieve synergies and cost savings by integrating the operations of the two companies. The combined organization has a presence in additional Midwestern markets, strong commercial banking capabilities, a robust retail footprint, a significant wealth platform, and an enhanced ability to attract talent. The combined organization also creates the scale and profitability to accelerate digital and technological capabilities to drive future investments in consumer and commercial banking, as well as wealth management services. Pursuant to the terms of the merger agreement, each First Midwest common stockholder received 1.1336 shares of Old National common stock for each share of First Midwest common stock such stockholder owned, plus, if applicable, cash in lieu of fractional shares of Old National common stock resulting from the exchange ratio. Each outstanding share of 7.000% fixed-rate non-cumulative perpetual preferred stock, Series A, no par value, and each outstanding share of 7.000% fixed-rate non-cumulative perpetual preferred stock, Series C, no par value, of First Midwest was converted into the right to receive one share of an applicable newly created series of Old National preferred stock, no par value “Old National Series A Preferred Stock” and “Old National Series C Preferred Stock,” and collectively, the “Old National Preferred Stock”. In this regard, Old National issued 108,000 shares of Old National Series A Preferred Stock and 122,500 shares of Old National Series C Preferred Stock. Old National entered into two deposit agreements, each dated as of February 15, 2022, by and among Old National, Continental Stock Transfer & Trust Company, as depository, and the holders from time to time of the depositary receipts in connection with the issuance of the Old National Preferred Stock. Pursuant to the deposit agreements, Old National issued 4,320,000 depositary shares, each representing a 1/40th interest in a share of Old National Series A Preferred Stock, and 4,900,000 depositary shares, each representing a 1/40th interest in a share of Old National Series C Preferred Stock. The assets acquired and liabilities assumed, both intangible and tangible, in the merger were recorded at their estimated fair values as of the merger date and have been accounted for under the acquisition method of accounting. Subsequent to the initial valuation, Old National increased goodwill by $1.6 million to update the provisional valuation of the fair values of assets acquired and liabilities assumed. These adjustments affected goodwill, loans, premises and equipment, operating lease right-of-use assets, other assets, and accrued expenses and other liabilities. 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 Goodwill related to this merger will not be deductible for tax purposes. Other intangible assets acquired included core deposit intangibles and customer trust relationships. The estimated fair value of the core deposit intangible was $77.9 million and is being amortized over an estimated useful life of 10 years. The estimated fair value of customer trust relationships was $39.7 million and is being amortized over an estimated useful life of 13 years. The fair value of purchased financial assets with credit deterioration was $1.4 billion on the date of the merger. The gross contractual amounts receivable relating to the purchased financial assets with credit deterioration was $1.5 billion. Old National estimates, on the date of the merger, that $89.1 million of the contractual cash flows specific to the purchased financial assets with credit deterioration will not be collected. Transaction costs totaling $120.9 million associated with the merger have been expensed in 2022 and 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, 2022, the fair value of Pension Plan assets was $16.6 million. Pension costs were not material in 2022. Summary of Unaudited Pro-Forma Financial Information The following table presents supplemental unaudited pro-forma financial information as if the First Midwest merger had occurred on January 1, 2021. The pro-forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction been effective as of this assumed date. Years Ended December 31, (dollars in thousands) 2022 2021 Total revenues (1) $ 1,812,333 $ 1,564,287 Income before income taxes 749,009 382,102 (1) Includes net interest income and total noninterest income . Supplemental pro-forma earnings for the year ended December 31, 2022 were adjusted to exclude $120.9 million of merger-related costs, $11.0 million of provision for credit losses on unfunded loan commitments, and $96.3 million of provision for credit losses to establish an allowance for credit losses on non-PCD loans acquired in the transaction. Supplemental pro-forma earnings for the year ended December 31, 2021 were adjusted to include these costs. Divestitures On November 18, 2022, Old National completed its previously announced transaction with UMB, pursuant to which UMB acquired Old National’s 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 are recorded in noninterest expense. During 2020, we consolidated 31 banking centers located throughout our footprint, reflecting an ongoing shift among our clients toward digital banking solutions. Many of the facilities consolidated were in smaller markets, several of which were added in recent years through acquisition and partnership activity. These actions resulted in pre-tax charges of $27.1 million associated with valuation adjustments related to these locations and were recorded in noninterest expense.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2022
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. The Company held no securities classified as held-to-maturity as of December 31, 2021. (dollars in thousands) Amortized Unrealized Unrealized Basis Adjustments (1) Fair 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 December 31, 2021 Available-for-Sale U.S. Treasury $ 234,555 $ 1,233 $ (7,751) $ 7,547 $ 235,584 U.S. government-sponsored entities and agencies 1,575,994 7,354 (37,014) (3,561) 1,542,773 Mortgage-backed securities - Agency 3,737,484 27,421 (66,074) — 3,698,831 States and political subdivisions 1,587,172 69,696 (1,882) — 1,654,986 Pooled trust preferred securities 13,756 — (4,260) — 9,496 Other securities 235,072 6,578 (1,254) — 240,396 Total available-for-sale securities $ 7,384,033 $ 112,282 $ (118,235) $ 3,986 $ 7,382,066 (1) Basis adjustments represent the cumulative fair value adjustments included in the carrying amounts of fixed-rate investment securities assets in fair value hedging arrangements . During 2022, U.S government-sponsored entity and agency securities, agency mortgage-backed securities, and state and political subdivision securities with a fair value of $3.0 billion were transferred from the available-for-sale portfolio to the held-to-maturity portfolio. The $125.2 million unrealized holding loss, net of tax, at the date of transfer will continue to be reported as a separate component of shareholders’ equity and is being amortized over the remaining term of the securities as an adjustment to yield. The corresponding discount on these securities will offset this adjustment to yield as it is amortized. 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) 2022 2021 2020 Proceeds from sales of available-for-sale debt securities $ 20,032 $ 198,886 $ 299,885 Proceeds from calls of available-for-sale debt securities 70,808 158,818 465,179 Total $ 90,840 $ 357,704 $ 765,064 Realized gains on sales of available-for-sale debt securities $ 344 $ 4,188 $ 11,172 Realized gains on calls of available-for-sale debt securities 187 317 121 Realized losses on sales of available-for-sale debt securities (377) (145) (500) Realized losses on calls of available-for-sale debt securities (242) (33) (26) Debt securities gains (losses), net $ (88) $ 4,327 $ 10,767 Investment securities pledged to secure public and other funds had a carrying value of $6.1 billion at December 31, 2022 and $2.7 billion at December 31, 2021. At December 31, 2022, 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 $628.6 million, which represented 12.3% of shareholders’ equity. Of the bonds issued by Indiana, 99.7% are rated “BBB+” or better, and the remaining 0.3% generally represent pre-refunded positions. Substantially all of the mortgage-backed securities in the investment portfolio are residential mortgage-backed securities. 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, 2022 (dollars in thousands) Amortized Fair Weighted Maturity Available-for-Sale Within one year $ 108,432 $ 106,803 2.67 % One to five years 1,821,584 1,697,506 2.83 % Five to ten years 4,289,711 3,722,857 2.32 % Beyond ten years 1,552,876 1,246,546 2.52 % Total $ 7,772,603 $ 6,773,712 2.48 % Held-to-Maturity One to five years $ 71,144 $ 65,481 3.56 % Five to ten years 1,211,517 1,079,532 2.73 % Beyond ten years 1,806,486 1,498,669 2.83 % Total $ 3,089,147 $ 2,643,682 2.81 % 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, 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) December 31, 2021 Available-for-Sale U.S. Treasury $ 91,063 $ (7,751) $ — $ — $ 91,063 $ (7,751) U.S. government-sponsored entities 1,032,566 (21,167) 312,949 (15,847) 1,345,515 (37,014) Mortgage-backed securities - Agency 2,415,923 (59,277) 163,685 (6,797) 2,579,608 (66,074) States and political subdivisions 178,570 (1,849) 2,729 (33) 181,299 (1,882) Pooled trust preferred securities — — 9,496 (4,260) 9,496 (4,260) Other securities 56,976 (943) 21,133 (311) 78,109 (1,254) Total available-for-sale $ 3,775,098 $ (90,987) $ 509,992 $ (27,248) $ 4,285,090 $ (118,235) 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, 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 $148.9 million at December 31, 2022 that 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, 2022. Accrued interest receivable on securities portfolio is excluded from the estimate of credit losses and totaled $50.9 million at December 31, 2022 and $35.5 million at December 31, 2021. At December 31, 2022, Old National’s securities portfolio consisted of 3,150 securities, 2,803 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 temporary 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, 2022, 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, 2022 or December 31, 2021. Equity Securities Old National’s equity securities with readily determinable fair values totaled $52.5 million at December 31, 2022 and $13.2 million at December 31, 2021. There were losses on equity securities of $4.9 million during 2022, gains on equity securities of $0.2 million during 2021, and gains on equity securities of $1.4 million during 2020. Alternative Investments Old National has alternative investments without readily determinable fair values that are included in other assets totaling $396.8 million at December 31, 2022, consisting of $240.1 million of illiquid investments of partnerships, limited liability companies, and other ownership interests that support affordable housing and $156.8 million of economic development and community revitalization initiatives in low-to-moderate income neighborhoods. These alternative investments totaled $186.0 million at December 31, 2021. There were no impairments or adjustments on equity securities without readily determinable fair values, except for amortization of tax credit investments during 2022 and 2021. There were impairments on these securities totaling $0.1 million in 2020.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2022
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. 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: Statement Portfolio After (dollars in thousands) December 31, 2022 Commercial $ 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 $ 31,123,641 $ — $ 31,123,641 December 31, 2021 Commercial $ 3,391,769 $ (191,557) $ 3,200,212 Commercial real estate 6,380,674 (159,190) 6,221,484 BBCC N/A 350,747 350,747 Residential real estate 2,255,289 — 2,255,289 Consumer 1,574,114 (1,574,114) N/A Indirect N/A 873,139 873,139 Direct N/A 140,385 140,385 Home equity N/A 560,590 560,590 Total $ 13,601,846 $ — $ 13,601,846 The composition of loans by portfolio segment follows: December 31, (dollars in thousands) 2022 2021 Commercial (1) (2) $ 9,298,624 $ 3,200,212 Commercial real estate 12,298,748 6,221,484 BBCC 368,602 350,747 Residential real estate 6,460,441 2,255,289 Indirect 1,034,257 873,139 Direct 629,186 140,385 Home equity 1,033,783 560,590 Total loans 31,123,641 13,601,846 Allowance for credit losses on loans (303,671) (107,341) Net loans $ 30,819,970 $ 13,494,505 (1) Includes direct finance leases of $188.1 million at December 31, 2022 and $25.1 million at December 31, 2021. (2) Includes remaining PPP loans of $32.5 million at December 31, 2022 and $169.0 million December 31, 2021. 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 227%, Old National Bank’s commercial real estate loans as a percentage of its risk-based capital remained well below the regulatory guideline limit of 300% at December 31, 2022. 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, conservative credit policies, 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 conservative 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 conservative credit policies. Home Equity Home equity loans are generally secured by 1 - 4 family residences that are owner occupied. Old National has established conservative 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 conservative credit policies as well as monitoring of updated borrower credit scores. Related Party Loans In the ordinary course of business, Old National grants loans to certain executive officers, directors, and significant subsidiaries (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, 2022 or 2021. Allowance for Credit Losses 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. Expected credit loss inherent in non-cancelable off-balance-sheet credit exposures is accounted for as a separate liability included in other liabilities on the balance sheet. The allowance for credit losses on loans held for investment is adjusted by a credit loss expense, which is reported in earnings, and reduced by the charge-off of loan amounts, net of recoveries. Old National has made a policy election to report accrued interest receivable as a separate line item on the balance sheet. Accrued interest receivable on loans is excluded from the estimate of credit losses and totaled $137.7 million at December 31, 2022 and $47.6 million at December 31, 2021. 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. 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, conflict in Ukraine, 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 Impact of Charge-offs Recoveries Provision Balance at 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 Year Ended December 31, 2020 Commercial $ 21,359 $ — $ 7,150 $ (5,593) $ 3,629 $ 4,022 $ 30,567 Commercial real estate 20,535 — 25,548 (4,323) 4,515 29,535 75,810 BBCC 2,279 — 3,702 (95) 140 94 6,120 Residential real estate 2,299 — 6,986 (824) 633 3,514 12,608 Indirect 5,319 — (1,669) (2,754) 1,922 762 3,580 Direct 1,863 — (1,059) (1,763) 819 995 855 Home equity 965 — 689 (201) 922 (527) 1,848 Total $ 54,619 $ — $ 41,347 $ (15,553) $ 12,580 $ 38,395 $ 131,388 The allowance for credit losses on loans increased for the year ended December 31, 2022 primarily due to $89.1 million of allowance for credit losses on acquired PCD loans established through acquisition accounting adjustments on or after the merger date with First Midwest and $96.3 million of provision for credit losses to establish an allowance for credit losses on non-PCD loans acquired in the First Midwest merger. 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) 2022 2021 2020 Balance at beginning of period $ 10,879 $ 11,689 $ 2,656 Provision for credit losses on unfunded loan commitments 11,013 — — Impact of adopting ASC 326 — — 4,549 Provision for unfunded loan commitments 10,296 (810) 4,484 Balance at end of period $ 32,188 $ 10,879 $ 11,689 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 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 Origination Year Revolving to Term (dollars in thousands) 2021 2020 2019 2018 2017 Prior Revolving Total December 31, 2021 Commercial: Risk Rating: Pass $ 918,456 $ 563,869 $ 271,158 $ 98,468 $ 156,136 $ 235,639 $ 667,628 $ 130,470 $ 3,041,824 Criticized 9,998 7,885 6,660 — 7,809 2,658 14,601 10,076 59,687 Classified: Substandard 14,773 14,468 10,200 9,849 5,521 945 6,883 10,322 72,961 Nonaccrual 1,069 3,507 1,276 3,721 1,448 — 845 7,796 19,662 Doubtful — 178 — 288 337 5,275 — — 6,078 Total $ 944,296 $ 589,907 $ 289,294 $ 112,326 $ 171,251 $ 244,517 $ 689,957 $ 158,664 $ 3,200,212 Commercial real estate: Risk Rating: Pass $ 1,555,880 $ 1,474,271 $ 846,921 $ 481,508 $ 462,176 $ 611,680 $ 42,609 $ 451,544 $ 5,926,589 Criticized 27,622 24,790 39,914 — 21,614 22,157 — 34,387 170,484 Classified: Substandard 4,706 12,118 9,933 9,058 18,165 11,351 2,291 4,339 71,961 Nonaccrual 1,620 2,997 — 1,627 3,419 8,905 315 871 19,754 Doubtful 6,653 — 1,970 342 11,218 12,513 — — 32,696 Total $ 1,596,481 $ 1,514,176 $ 898,738 $ 492,535 $ 516,592 $ 666,606 $ 45,215 $ 491,141 $ 6,221,484 BBCC: Risk Rating: Pass $ 81,710 $ 69,749 $ 54,580 $ 34,461 $ 25,113 $ 8,296 $ 47,571 $ 18,778 $ 340,258 Criticized 1,320 1,170 841 160 — — 670 1,578 5,739 Classified: Substandard 284 24 79 7 187 465 103 239 1,388 Nonaccrual — 88 — — 66 162 — 1,136 1,452 Doubtful — 25 284 1,391 — 210 — — 1,910 Total $ 83,314 $ 71,056 $ 55,784 $ 36,019 $ 25,366 $ 9,133 $ 48,344 $ 21,731 $ 350,747 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) 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 Origination Year Revolving to Term 2021 2020 2019 2018 2017 Prior Revolving Total December 31, 2021 Residential real estate: Performing $ 625,582 $ 632,705 $ 272,600 $ 72,766 $ 103,866 $ 529,293 $ 12 $ 105 $ 2,236,929 Nonperforming 96 165 166 350 855 16,728 — — 18,360 Total $ 625,678 $ 632,870 $ 272,766 $ 73,116 $ 104,721 $ 546,021 $ 12 $ 105 $ 2,255,289 Indirect: Performing $ 361,485 $ 231,156 $ 146,978 $ 68,513 $ 41,598 $ 20,819 $ — $ 9 $ 870,558 Nonperforming 262 524 614 510 430 241 — — 2,581 Total $ 361,747 $ 231,680 $ 147,592 $ 69,023 $ 42,028 $ 21,060 $ — $ 9 $ 873,139 Direct: Performing $ 34,058 $ 16,135 $ 14,396 $ 14,579 $ 7,432 $ 15,831 $ 36,812 $ 192 $ 139,435 Nonperforming 13 53 130 133 35 536 42 8 950 Total $ 34,071 $ 16,188 $ 14,526 $ 14,712 $ 7,467 $ 16,367 $ 36,854 $ 200 $ 140,385 Home equity: Performing $ — $ — $ 633 $ 349 $ 535 $ — $ 539,057 $ 16,768 $ 557,342 Nonperforming — — 16 9 41 1 258 2,923 3,248 Total $ — $ — $ 649 $ 358 $ 576 $ 1 $ 539,315 $ 19,691 $ 560,590 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, 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 December 31, 2021 Commercial $ 2,723 $ 617 $ 1,603 $ 4,943 $ 3,195,269 $ 3,200,212 Commercial real estate 1,402 280 7,042 8,724 6,212,760 6,221,484 BBCC 747 162 109 1,018 349,729 350,747 Residential 8,273 2,364 4,554 15,191 2,240,098 2,255,289 Indirect 3,888 867 554 5,309 867,830 873,139 Direct 687 159 162 1,008 139,377 140,385 Home equity 693 199 777 1,669 558,921 560,590 Total $ 18,413 $ 4,648 $ 14,801 $ 37,862 $ 13,563,984 $ 13,601,846 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, 2022 December 31, 2021 (dollars in thousands) Nonaccrual Nonaccrual Past Due Nonaccrual Nonaccrual Past Due Commercial $ 60,372 $ 7,873 $ 152 $ 25,740 $ 9,574 $ — Commercial real estate 122,290 33,445 — 52,450 25,139 — BBCC 2,429 — — 3,362 — — Residential 34,660 — 1,808 18,360 — — Indirect 3,230 — 28 2,581 — 4 Direct 3,997 — 133 950 — 3 Home equity 11,200 — 529 3,248 — — Total $ 238,178 $ 41,318 $ 2,650 $ 106,691 $ 34,713 $ 7 Interest income recognized on nonaccrual loans was insignificant during the years ended December 31, 2022 and 2021. 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, 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 December 31, 2021 Commercial $ 8,100 $ 13,816 $ 3,394 $ 80 $ 302 Commercial Real Estate 38,657 — 961 — 6,653 BBCC 1,895 1,331 43 93 — Residential 18,360 — — — — Indirect — — — 2,581 — Direct 724 — 1 152 20 Home equity 3,248 — — — — Total $ 70,984 $ 15,147 $ 4,399 $ 2,906 $ 6,975 Loan Participations Old National has loan participations, which qualify as participating interests, with other financial institutions. At December 31, 2022, these loans totaled $2.3 billion, of which $1.1 billion had been sold to other financial institutions and $1.2 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. Troubled Debt Restructurings Old National may choose to restructure the contractual terms of certain loans. The decision to restructure a loan, versus aggressively enforcing the collection of the loan, may benefit Old National by increasing the ultimate probability of collection. Any loans that are modified are reviewed by Old National to identify if a TDR has occurred, which is when for economic or legal reasons related to a borrower’s financial difficulties, Old National Bank grants a concession to the borrower that it would not otherwise consider. 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 at a stated rate of interest lower than the current market rate of new debt with similar risk, or a permanent reduction of the recorded investment of the loan. Loans modified in a TDR are typically placed on nonaccrual status until we determine the future collection of principal and interest is reasonably assured, which generally requires that the borrower demonstrate a period of performance according to the restructured terms for six months. If we are unable to resolve a nonperforming loan issue, the credit will be charged off when it is apparent there will be a loss. For large commercial type loans, each relationship is individually analyzed for evidence of apparent loss based on quantitative benchmarks or subjectively based upon certain events or particular circumstances. For residential and consumer loans, a charge off is recorded at the time foreclosure is initiated or when the loan becomes 120 to 180 days past due, whichever is earlier. For commercial TDRs, an allocation is established within the allowance for credit losses on loans for the difference between the carrying value of the loan and its computed value. To determine the computed value of the loan, one of the following methods is selected: (1) the present value of expected cash flows discounted at the loan’s original effective interest rate, (2) the loan’s observable market price, or (3) the fair value of the collateral, if the loan is collateral dependent. The allocation is established as the difference between the carrying value of the loan and the collectable value. If there are significant changes in the amount or timing of the loan’s expected future cash flows, the allowance allocation is recalculated and adjusted accordingly. When a residential or consumer loan is identified as a TDR, the loan is typically written down to its collateral value less selling costs. The following table presents activity in TDRs: (dollars in thousands) Beginning Balance (Charge-offs)/ Recoveries (Payments)/ Disbursements Additions Ending Balance Year Ended December 31, 2022 Commercial $ 7,456 $ — $ (6,880) $ 5,194 $ 5,770 Commercial real estate 17,158 4 (10,908) 21,982 28,236 BBCC 87 3 (16) — 74 Residential 2,435 — (169) — 2,266 Indirect — 1 (1) — — Direct 2,704 — (58) 194 2,840 Home equity 199 1 (84) — 116 Total $ 30,039 $ 9 $ (18,116) $ 27,370 $ 39,302 Year Ended December 31, 2021 Commercial $ 11,090 $ — $ (4,535) $ 901 $ 7,456 Commercial real estate 17,606 24 (2,166) 1,694 17,158 BBCC 112 8 (33) — 87 Residential 2,824 (4) (385) — 2,435 Indirect — 3 (3) — — Direct 739 2 (101) 2,064 2,704 Home equity 282 3 (86) — 199 Total $ 32,653 $ 36 $ (7,309) $ 4,659 $ 30,039 Year Ended December 31, 2020 Commercial $ 12,412 $ 633 $ (4,557) $ 2,602 $ 11,090 Commercial real estate 14,277 4,801 (8,502) 7,030 17,606 BBCC 578 (19) (447) — 112 Residential 3,107 — (283) — 2,824 Indirect — 9 (9) — — Direct 983 23 (267) — 739 Hom

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 Land $ 91,568 $ 71,014 Buildings 419,596 394,400 Furniture, fixtures, and equipment 154,719 118,124 Leasehold improvements 69,412 46,330 Total 735,295 629,868 Accumulated depreciation (177,988) (153,682) Premises and equipment, net $ 557,307 $ 476,186 During 2022, Old National recorded $111.9 million of premises and equipment associated with the merger with First Midwest. See Note 2 to the consolidated financial statements for additional detail regarding this transaction. Depreciation expense was $36.4 million in 2022, $27.3 million in 2021, and $28.9 million in 2020. 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, 2022
Lessee Disclosure [Abstract]
Leases	LEASES Old National determines if an arrangement is or contains a lease at contract inception. Operating leases are included in operating lease right-of-use assets and operating lease 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) 2022 2021 2020 Operating lease cost Occupancy/Equipment expense $ 29,368 $ 12,336 $ 23,548 Finance lease cost: Amortization of right-of-use assets Occupancy expense 2,672 2,356 1,044 Interest on lease liabilities Interest expense 415 431 364 Sub-lease income Occupancy expense (448) (438) (512) Total $ 32,007 $ 14,685 $ 24,444 Supplemental balance sheet information related to leases was as follows: December 31, (dollars in thousands) 2022 2021 Operating Leases Operating lease right-of-use assets $ 189,714 $ 69,560 Operating lease liabilities 211,964 76,236 Finance Leases Premises and equipment, net 10,799 16,451 Other borrowings 13,469 17,233 Weighted-Average Remaining Lease Term (in Years) Operating leases 9.1 10.4 Finance leases 7.2 7.6 Weighted-Average Discount Rate Operating leases 2.88 % 3.34 % Finance leases 3.30 % 3.02 % Supplemental cash flow information related to leases was as follows: Years Ended December 31, (dollars in thousands) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 30,340 $ 13,823 $ 15,906 Operating cash flows from finance leases 415 431 364 Financing cash flows from finance leases 2,475 2,057 819 The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2022: (dollars in thousands) Operating Finance 2023 $ 30,951 $ 2,600 2024 29,939 2,643 2025 28,635 2,645 2026 27,639 1,400 2027 26,604 1,381 Thereafter 98,539 4,525 Total undiscounted lease payments 242,307 15,194 Amounts representing interest (30,343) (1,725) Lease liability $ 211,964 $ 13,469
Leases	LEASES Old National determines if an arrangement is or contains a lease at contract inception. Operating leases are included in operating lease right-of-use assets and operating lease 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) 2022 2021 2020 Operating lease cost Occupancy/Equipment expense $ 29,368 $ 12,336 $ 23,548 Finance lease cost: Amortization of right-of-use assets Occupancy expense 2,672 2,356 1,044 Interest on lease liabilities Interest expense 415 431 364 Sub-lease income Occupancy expense (448) (438) (512) Total $ 32,007 $ 14,685 $ 24,444 Supplemental balance sheet information related to leases was as follows: December 31, (dollars in thousands) 2022 2021 Operating Leases Operating lease right-of-use assets $ 189,714 $ 69,560 Operating lease liabilities 211,964 76,236 Finance Leases Premises and equipment, net 10,799 16,451 Other borrowings 13,469 17,233 Weighted-Average Remaining Lease Term (in Years) Operating leases 9.1 10.4 Finance leases 7.2 7.6 Weighted-Average Discount Rate Operating leases 2.88 % 3.34 % Finance leases 3.30 % 3.02 % Supplemental cash flow information related to leases was as follows: Years Ended December 31, (dollars in thousands) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 30,340 $ 13,823 $ 15,906 Operating cash flows from finance leases 415 431 364 Financing cash flows from finance leases 2,475 2,057 819 The following table presents a maturity analysis of the Company’s lease liability by lease classification at December 31, 2022: (dollars in thousands) Operating Finance 2023 $ 30,951 $ 2,600 2024 29,939 2,643 2025 28,635 2,645 2026 27,639 1,400 2027 26,604 1,381 Thereafter 98,539 4,525 Total undiscounted lease payments 242,307 15,194 Amounts representing interest (30,343) (1,725) Lease liability $ 211,964 $ 13,469

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 2020 Balance at beginning of period $ 1,036,994 $ 1,036,994 $ 1,036,994 Acquisitions and adjustments 961,722 — — Balance at end of period $ 1,998,716 $ 1,036,994 $ 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, 2022 and there was no impairment. No events or circumstances since the August 31, 2022 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, 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 December 31, 2021 Core deposit $ 92,754 $ (60,036) $ 32,718 Customer trust relationships 16,547 (14,587) 1,960 Total intangible assets $ 109,301 $ (74,623) $ 34,678 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 2022, 2021, or 2020. Total amortization expense associated with intangible assets was $25.9 million in 2022, $11.3 million in 2021, and $14.1 million in 2020. Estimated amortization expense for future years is as follows: (dollars in thousands) 2023 $ 24,214 2024 21,298 2025 18,417 2026 15,614 2027 12,926 Thereafter 33,936 Total $ 126,405

Loan Servicing Rights

Loan Servicing Rights	12 Months Ended
	Dec. 31, 2022
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, 2022, loan servicing rights derived from mortgage loans sold with servicing retained totaled $37.3 million, compared to $30.0 million at December 31, 2021. Loans serviced for others are not reported as assets. The principal balance of mortgage loans serviced for others was $4.3 billion at December 31, 2022, compared to $3.7 billion at December 31, 2021. Custodial escrow balances maintained in connection with serviced loans were $27.0 million at December 31, 2022 and $18.2 million at December 31, 2021. 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) 2022 2021 2020 Balance at beginning of period $ 30,085 $ 28,124 $ 25,399 Additions (1) 13,080 11,759 12,810 Amortization (5,898) (9,798) (10,085) Balance before valuation allowance at end of period 37,267 30,085 28,124 Valuation allowance: Balance at beginning of period (46) (1,407) (31) (Additions)/recoveries 46 1,361 (1,376) Balance at end of period — (46) (1,407) Loan servicing rights, net $ 37,267 $ 30,039 $ 26,717 (1) Additions in 2022 include loan servicing rights of $7.7 million acquired in the First Midwest merger on February 15, 2022. 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%. At December 31, 2021, the fair value of servicing rights was $33.8 million, which was determined using a discount rate of 9% and a conditional prepayment rate of 10%.

Qualified Affordable Housing Pr

Qualified Affordable Housing Projects and Other Tax Credit Investments	12 Months Ended
	Dec. 31, 2022
Investments in Affordable Housing Projects [Abstract]
Qualified Affordable Housing Projects and Other Tax Credit Investments	QUALIFIED AFFORDABLE HOUSING PROJECTS AND OTHER TAX CREDIT INVESTMENTSOld 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, 2022, 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, 2022 December 31, 2021 Investment Accounting Method Investment Unfunded Commitment (1) Investment Unfunded Commitment LIHTC Proportional amortization $ 84,428 $ 55,754 $ 68,989 $ 41,355 FHTC Equity 19,316 9,588 21,241 15,252 NMTC Consolidation 51,912 — 18,727 — Renewable Energy Equity 1,099 — 1,985 — Total $ 156,755 $ 65,342 $ 110,942 $ 56,607 (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, 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) Year Ended December 31, 2020 LIHTC $ 3,105 $ (4,071) FHTC 13,237 (15,582) NMTC 900 (1,100) Renewable Energy 4,651 (4,122) Total $ 21,893 $ (24,875) (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, 2022
Deposits [Abstract]
Deposits	DEPOSITS At December 31, 2022, the scheduled maturities of total time deposits were as follows: (dollars in thousands) Due in 2023 $ 2,099,157 Due in 2024 684,377 Due in 2025 118,776 Due in 2026 64,207 Due in 2027 41,794 Thereafter 5,469 Total $ 3,013,780 The aggregate amount of time deposits in denominations that met or exceeded the FDIC insurance limit of $250,000 totaled $793.4 million at December 31, 2022 and $252.8 million at December 31, 2021.

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 Outstanding at year-end $ 432,804 $ 392,275 Average amount outstanding 440,619 392,777 Maximum amount outstanding at any month-end 509,275 405,278 Weighted-average interest rate: During year 0.19 % 0.10 % End of year 1.31 0.10 The following table presents the contractual maturity of our secured borrowings and class of collateral pledged: At December 31, 2022 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 $ 432,804 $ — $ — $ — $ 432,804 Total $ 432,804 $ — $ — $ — $ 432,804 The fair value of securities pledged to secure repurchase agreements may decline. Old National has pledged securities valued at 110% of the gross outstanding balance of repurchase agreements at December 31, 2022 to manage this risk.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 FHLB advances (fixed rates 0.00% to 4.96% and variable rates 3.90% to 4.17%) maturing January 2023 to September 2042 $ 3,850,677 $ 1,902,655 Fair value hedge basis adjustments and unamortized (21,659) (16,636) Total other borrowings $ 3,829,018 $ 1,886,019 FHLB advances had weighted-average rates of 3.15% at December 31, 2022 and 1.30% at December 31, 2021. Certain FHLB advances are collateralized with residential real estate loans at 140%. At December 31, 2022, total unamortized prepayment fees related to all debt modifications completed in prior years totaled $20.2 million, compared to $26.2 million at December 31, 2021. Contractual maturities of FHLB advances at December 31, 2022 were as follows: (dollars in thousands) Due in 2023 $ 950,149 Due in 2024 25,243 Due in 2025 550,285 Due in 2026 100,000 Thereafter 2,225,000 Fair value hedge basis adjustments and unamortized prepayment fees (21,659) Total $ 3,829,018

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Other Borrowings	OTHER BORROWINGS The following table summarizes Old National’s other borrowings: December 31, (dollars in thousands) 2022 2021 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 (247) (403) Subordinated debentures (fixed rate 5.875%) maturing September 2026 150,000 — Junior subordinated debentures (variable rates of 5.68% to 7.99%) maturing July 2031 to September 2037 136,643 42,000 Other basis adjustments 23,363 (3,044) Old National Bank: Finance lease liabilities 13,469 17,233 Subordinated debentures (variable rate 8.77%) 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 143,187 51,045 Other (1) 89,588 2,839 Total other borrowings $ 743,003 $ 296,670 (1) Includes overnight borrowings to collateralize certain derivative positions totaling $88.0 million at December 31, 2022. Contractual maturities of other borrowings at December 31, 2022 were as follows: (dollars in thousands) Due in 2023 $ 90,276 Due in 2024 177,335 Due in 2025 14,389 Due in 2026 151,188 Due in 2027 1,209 Thereafter 283,934 Unamortized debt issuance costs and other basis adjustments 24,672 Total $ 743,003 Senior Notes In August 2014, Old National issued $175.0 million of senior unsecured notes with a 4.125% interest rate. These notes pay interest on February 15 and August 15. The notes mature on August 15, 2024. 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, 2022: (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 LIBOR plus 3.58% 7.99 % July 31, 2031 Bridgeview Capital Trust II December 2002 15,464 3-month LIBOR plus 3.35% 7.43 % 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 LIBOR plus 1.75% 6.49 % March 17, 2035 Northern States Statutory Trust I September 2005 10,310 3-month LIBOR plus 1.80% 6.57 % September 15, 2035 Anchor Capital Trust III August 2005 5,000 3-month LIBOR plus 1.55% 6.30 % September 30, 2035 Great Lakes Statutory Trust II December 2005 6,186 3-month LIBOR plus 1.40% 6.17 % December 15, 2035 Home Federal Statutory September 2006 15,464 3-month LIBOR plus 1.65% 6.42 % September 15, 2036 Monroe Bancorp Capital July 2006 3,093 3-month LIBOR plus 1.60% 5.68 % October 7, 2036 Tower Capital Trust 3 December 2006 9,279 3-month LIBOR plus 1.69% 6.45 % March 1, 2037 Monroe Bancorp Statutory March 2007 5,155 3-month LIBOR plus 1.60% 6.37 % June 15, 2037 Great Lakes Statutory Trust III June 2007 8,248 3-month LIBOR plus 1.70% 6.47 % September 15, 2037 Total $ 136,643 Subordinated Debentures On November 1, 2017, Old National assumed $12.0 million of subordinated fixed-to-floating notes related to the acquisition of Anchor Bancorp, Inc. (MN). The subordinated debentures had a 5.75% fixed rate of interest through October 29, 2020. From October 30, 2020 to the October 30, 2025 maturity date, the debentures have a floating rate of interest equal to the three-month LIBOR rate plus 4.356%. On February 15, 2022, Old National assumed $150.0 million of subordinated fixed rate notes related to the First Midwest merger. The subordinated debentures have a 5.875% fixed rate of interest through the September 29, 2026 maturity date. 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 $13.5 million at December 31, 2022. 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, 2022
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, 2022 Balance at beginning of period $ (2,950) $ — $ 543 $ 32 $ (2,375) Other comprehensive income (loss) before reclassifications (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 reclassifications (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) Year Ended December 31, 2020 Balance at beginning of period $ 56,131 $ — $ 240 $ (164) $ 56,207 Other comprehensive income (loss) before reclassifications 97,596 — 6,230 — 103,826 Amounts reclassified from AOCI to income (1) (8,392) — (3,886) 16 (12,262) Balance at end of period $ 145,335 $ — $ 2,584 $ (148) $ 147,771 (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) 2022 2021 2020 Details about AOCI Components Amount Reclassified Affected Line Item in the Unrealized gains and losses on $ (88) $ 4,327 $ 10,767 Debt securities gains (losses), net 21 (990) (2,375) Income tax (expense) benefit $ (67) $ 3,337 $ 8,392 Net income Unrealized gains and losses on $ (16,612) $ — $ — Interest income (expense) 4,047 — — Income tax (expense) benefit $ (12,565) $ — $ — Net income Gains and losses on cash flow hedges $ (2,587) $ 4,605 $ 5,153 Interest income (expense) 636 (1,131) (1,267) Income tax (expense) benefit $ (1,951) $ 3,474 $ 3,886 Net income Amortization of defined benefit Actuarial gains (losses) $ (139) $ (239) $ (21) Salaries and employee benefits 34 59 5 Income tax (expense) benefit $ (105) $ (180) $ (16) Net income Total reclassifications for the period $ (14,688) $ 6,631 $ 12,262 Net income

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 2020 Provision at statutory rate of 21% $ 114,394 $ 71,161 $ 53,667 Tax-exempt income: Tax-exempt interest (14,588) (11,066) (10,776) Section 291/265 interest disallowance 363 114 189 Company-owned life insurance income (2,891) (2,138) (2,290) Tax-exempt income (17,116) (13,090) (12,877) State income taxes 20,837 9,308 4,840 Tax credit investments - federal (9,140) (5,212) (15,159) Officer compensation limitation 5,903 564 598 Other, net 1,568 (1,407) (1,922) Income tax expense $ 116,446 $ 61,324 $ 29,147 Effective tax rate 21.4 % 18.1 % 11.4 % The higher effective tax rate in 2022 when compared to 2021 reflected the increase in pre-tax book income and higher post-merger estimated state effective tax rates. An increase in non-deductible officer compensation also contributed to the higher tax rate, the majority of which was merger related. The higher effective tax rate in 2021 when compared to 2020 was primarily the result of an increase in pre-tax book income and lower tax credits. The provision for income taxes consisted of the following components: Years Ended December 31, (dollars in thousands) 2022 2021 2020 Current expense: Federal $ 106,918 $ 31,943 $ 19,223 State 32,898 8,461 6,498 Deferred expense: Federal (16,216) 17,514 3,188 State (7,154) 3,406 238 Deferred income tax expense (23,370) 20,920 3,426 Income tax expense $ 116,446 $ 61,324 $ 29,147 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) 2022 2021 Deferred Tax Assets Allowance for credit losses on loans, net of recapture $ 85,619 $ 28,843 Benefit plan accruals 38,038 18,348 Net operating loss carryforwards 25,135 14,823 Acquired loans 40,723 8,039 Operating lease liabilities 58,288 22,961 Unrealized losses on available-for-sale investment securities 202,101 3,003 Unrealized losses on held-to-maturity investment securities 36,197 — Unrealized losses on hedges 10,277 — Purchase accounting 20,063 — Other, net 4,962 3,430 Total deferred tax assets 521,403 99,447 Deferred Tax Liabilities Deferred loan origination fees (3,566) — Purchase accounting — (18,524) Loan servicing rights (9,636) (7,379) Premises and equipment (14,844) (16,972) Prepaid expenses (2,774) (796) Operating lease right-of-use assets (51,845) (21,129) Unrealized gains on hedges — (177) Other, net (2,983) (1,564) Total deferred tax liabilities (85,648) (66,541) Net deferred tax assets $ 435,755 $ 32,906 The increase in net deferred tax assets was driven by $238.3 million of deferred tax assets related to the market value adjustments of certain investments and $133.9 million related to the merger with First Midwest. The Company’s retained earnings at December 31, 2022 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 recorded at December 31, 2022 or 2021 because, based on current expectations, Old National believes it will generate sufficient income in future years to realize deferred tax assets. Old National has federal net operating loss carryforwards totaling $81.5 million at December 31, 2022 and $36.7 million at December 31, 2021. 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 $124.4 million at December 31, 2022 and $116.1 million at December 31, 2021. 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 at December 31, 2022 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) 2022 2021 2020 Balance at beginning of period $ — $ — $ — Additions for acquired uncertain tax positions 14,897 — — Reductions for tax positions relating to prior years (2,751) — — Reductions due to statute of limitations expiring (1,139) — — Balance at end of period $ 11,007 $ — $ — If recognized, approximately $8.8 million of unrecognized tax benefits, net of interest, would favorably affect the effective income tax rate in future periods. Old National expects the $8.8 million of unrecognized tax benefits to be reduced to $7.9 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 2022 were immaterial. Old National reversed $3.9 million in 2022 related to uncertain tax positions accounted for under FASB ASC 740-10 (FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes). The income tax reversal related to the 2018 statute of limitations expiring in the third quarter of 2022 totaled $1.1 million. The income tax reversal related to reductions for tax positions in prior years totaled $2.8 million. Old National and its subsidiaries file a consolidated U.S. federal income tax return, as well as filing various state returns. The 2019 through 2022 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, 2022
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 shareholder-approved, permits the grant of share-based awards to its employees. An amendment to increase the number of shares authorized for issuance under the ICP by 9.0 million was approved by our Board of Directors and then by our shareholders on May 18, 2022. At December 31, 2022, 9.1 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 that has been charged against income for the ICP was $28.7 million in 2022, $7.5 million in 2021, and $7.7 million in 2020. The total income tax benefit was $7.1 million in 2022, $1.8 million in 2021, and $1.9 million in 2020. 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 nonvested shares for the year follows: (shares in thousands) Shares Weighted Year Ended December 31, 2022 Unvested balance at beginning of period 554 $16.16 Granted during the year (1) 1,916 18.12 Vested during the year (453) 17.29 Forfeited during the year (148) 17.88 Unvested balance at end of period 1,869 $17.76 (1) In connection with the First Midwest merger, each restricted stock award of First Midwest common stock that was outstanding, unvested, and unsettled at the merger date was assumed and converted into a number of Old National restricted stock relating to a number of shares of Old National common stock equal to the number of First Midwest restricted stock multiplied by the exchange ratio (rounded up to the nearest whole number) subject to the same vesting terms and conditions, resulting in an issuance of an aggregate 0.9 million restricted stock awards of Old National common stock. As of December 31, 2022, there was $16.1 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 1.8 years. The total fair value of the shares vested was $7.9 million in 2022, $4.3 million in 2021, and $2.9 million in 2020. Performance-Based Restricted Stock Units Restricted stock units require certain performance requirements and shares vest at the end of a 24 or 36 month period based on the achievement of certain targets. If targets are achieved prior to the end of the 24 month performance period, vesting can be accelerated. 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 for the year follows: (shares in thousands) Shares Weighted Year Ended December 31, 2022 Unvested balance at beginning of period 886 $14.80 Granted during the year (1) 1,935 17.66 Vested during the year (720) 15.41 Forfeited during the year (73) 16.73 Dividend equivalents adjustment 53 16.82 Unvested balance at end of period 2,081 $17.23 (1) In connection with the First Midwest merger, each performance-based restricted stock unit award of First Midwest that was outstanding, unvested, and unsettled at the merger date was assumed and converted into a time-based restricted stock unit award of Old National common stock subject to the same vesting terms and conditions (other than performance conditions), resulting in an issuance of an aggregate 0.7 million restricted stock units of Old National common stock. The performance components of the First Midwest equity awards were deemed earned at target. As of December 31, 2022, there was $13.9 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 1.3 years. Stock Options and Appreciation Rights Option awards are generally granted with an exercise price equal to the market price of our Common Stock at the date of grant; these option awards have vesting periods ranging from 3 to 5 years and have 10-year contractual terms. 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, 2022, all options were fully vested and all compensation costs had been expensed. At December 31, 2022, the outstanding shares consisted of stock appreciation rights acquired through prior acquisitions. A summary of the activity in stock appreciation rights in 2022 follows: (shares in thousands) Shares Weighted Weighted Aggregate Year Ended December 31, 2022 Outstanding at beginning of period 28 $4.30 Exercised (22) 3.95 Outstanding at end of period 6 $5.67 0.18 $71.2 Options exercisable at end of year 6 $5.67 0.18 $71.2 Information related to stock option and appreciation rights follows: Year Ended December 31, (dollars in thousands) 2022 2021 2020 Intrinsic value of options/appreciation rights exercised $ 331 $ 171 $ 213 Tax benefit realized from options/appreciation rights exercises 132 68 85 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 2022, 19 thousand shares were issued to directors, compared to 25 thousand shares in 2021, and 28 thousand shares in 2020. Employee Stock Ownership Plan The Employee Stock Ownership and Savings Plan (the “401(k) Plan”) permits employees to participate the first month following one month of service. Old National matches 100% of employee compensation deferral contributions of the first 5% of compensation. 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 2022, 2021, or 2020. 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 1.2 million at December 31, 2022 and 0.5 million at December 31, 2021. 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 $17.9 million in 2022, $9.8 million in 2021, and $9.5 million in 2020.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2022
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, 2022, 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 price not less than 95% of the fair market value of the common shares on the purchase date. The amount of common shares purchased cannot exceed 10% of the employee’s compensation. In 2022, 52,000 shares were issued related to this plan with proceeds of approximately $809,000. In 2021, 35,000 shares were issued related to this plan with proceeds of approximately $583,000. Share Repurchase Plan In the first quarter of 2022, 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 January 31, 2023. During 2022 and through January 31, 2023, 3.5 million common shares were repurchased under the plan, which reduced equity by $63.8 million. 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, 2022 2021 2020 Net income $ 428,287 $ 277,538 $ 226,409 Preferred dividends (14,118) — — Net income applicable to common shares $ 414,169 $ 277,538 $ 226,409 Weighted average common shares outstanding: Weighted average common shares outstanding (basic) 275,179 165,178 165,509 Effect of dilutive securities: Restricted stock 1,502 729 632 Stock appreciation rights 7 22 36 Weighted average diluted shares outstanding 276,688 165,929 166,177 Basic Net Income Per Common Share $ 1.51 $ 1.68 $ 1.37 Diluted Net Income Per Common Share $ 1.50 $ 1.67 $ 1.36

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2022
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 LIBOR 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. Residential 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 derivative valuation models using market data 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, 2022 Using (dollars in thousands) Carrying Value 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 — Residential loans held for sale 11,926 — 11,926 — Derivative assets 169,001 — 169,001 — Financial Liabilities Derivative liabilities 380,704 — 380,704 — Fair Value Measurements at December 31, 2021 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Equity securities $ 13,211 $ 13,211 $ — $ — Investment securities available-for-sale: U.S. Treasury 235,584 235,584 — — U.S. government-sponsored entities and agencies 1,542,773 — 1,542,773 — Mortgage-backed securities - Agency 3,698,831 — 3,698,831 — States and political subdivisions 1,654,986 — 1,654,986 — Pooled trust preferred securities 9,496 — — 9,496 Other securities 240,396 — 240,396 — Residential loans held for sale 35,458 — 35,458 — Derivative assets 74,226 — 74,226 — Financial Liabilities Derivative liabilities 41,872 — 41,872 — The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3): (dollars in thousands) Pooled Trust States and Year Ended December 31, 2022 Balance at beginning of period $ 9,496 $ — Accretion (amortization) of discount or premium 12 — Increase (decrease) in fair value of securities 1,593 — Transfers out of Level 3 (11,101) — Balance at end of period $ — $ — Year Ended December 31, 2021 Balance at beginning of period $ 7,913 $ — Accretion (amortization) of discount or premium 20 — Sales/payments received (27) — Increase (decrease) in fair value of securities 1,590 — Balance at end of period $ 9,496 $ — Year Ended December 31, 2020 Balance at beginning of period $ 8,222 $ 40 Accretion (amortization) of discount or premium 15 — Sales/payments received (64) (40) Increase (decrease) in fair value of securities (260) — Balance at end of period $ 7,913 $ — The accretion of discounts or amortization of premiums on securities in the table above is included in interest income. The increase or decrease in the fair value of securities in the table above is included in the unrealized holding gains (losses) for the period in the statement of other comprehensive income (loss). An increase in fair value is reflected in the balance sheet as an increase in the fair value of investment securities available-for-sale, an increase in AOCI, which is included in shareholders’ equity, and a decrease in other assets related to the tax impact. A decrease in fair value is reflected in the balance sheet as a decrease in the fair value of investment securities available-for-sale, a decrease in AOCI, which is included in shareholders’ equity, and an increase in other assets related to the tax impact. During 2022, Old National’s pooled trust preferred securities with a fair value of $11.1 million were transferred out of Level 3 and into Level 2 because of available observable market data for these investments. 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 Value Valuation Unobservable Input Range (Weighted Average) (4) December 31, 2021 Pooled trust preferred securities $ 9,496 Discounted cash flow Constant prepayment rate (1) 0.0% Additional asset defaults (2) 5.7% - 8.5% (6.5%) Expected asset recoveries (3) 0.0% - 46.0% (14.1%) (1) Assuming no prepayments. (2) Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50%, or 100%. (3) Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25%, or 100%. (4) Unobservable inputs are weighted by the estimated number of defaults and current performing collateral of the instruments. Significant changes in any of the unobservable inputs used in the fair value measurement in isolation would have resulted in a significant change to the fair value measurement. The pooled trust preferred securities Old National owns are subordinate note classes that rely on an ongoing cash flow stream to support their values. The senior note classes receive the benefit of prepayments to the detriment of subordinate note classes since the ongoing interest cash flow stream is reduced by the early redemption. Generally, a change in prepayment rates or additional pool asset defaults would have an impact that is directionally opposite from a change in the expected recovery of a defaulted pool asset. Non-Recurring Basis Assets measured at fair value on a non-recurring basis are summarized below: Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Significant Unobservable Inputs Collateral Dependent Loans: Commercial loans $ 22,562 $ — $ — $ 22,562 Commercial real estate loans 48,026 — — 48,026 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 $92.0 million, with a valuation allowance of $21.5 million at December 31, 2022. Old National recorded provision expense associated with commercial and commercial real estate loans that were deemed collateral dependent totaling $20.3 million in 2022. 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, 2022. There were write-downs of other real estate owned of $0.6 million in 2022. Loan servicing rights are evaluated for impairment based upon the fair value of the rights as compared to the carrying amount. If the carrying amount of an individual tranche exceeds fair value, impairment is recorded on that tranche so that the servicing asset is carried at fair value. Fair value is determined at a tranche level, based on market prices for comparable mortgage servicing contracts when available, or alternatively based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model utilizes a discount rate, weighted average prepayment speed, and other economic factors that market participants would use in estimating future net servicing income and that can be validated against available market data (Level 2). There was no valuation allowance for loan servicing rights with impairments at December 31, 2022. Old National recorded recoveries associated with these loan servicing rights totaling $46 thousand in 2022. Assets measured at fair value on a non-recurring basis at December 31, 2021 are summarized below: Fair Value Measurements at December 31, 2021 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Collateral Dependent Loans: Commercial loans $ 2,364 $ — $ — $ 2,364 Commercial real estate loans 16,308 — — 16,308 Loan servicing rights 140 — 140 — At December 31, 2021, commercial and commercial real estate loans that were deemed collateral dependent had a principal amount of $21.0 million, with a valuation allowance of $2.1 million. Old National recorded provision recapture associated with these loans totaling $0.1 million in 2021. The valuation allowance for loan servicing rights with impairments at December 31, 2021 totaled $46 thousand. Old National recorded recoveries associated with these loan servicing rights totaling $1.4 million in 2021. 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, 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%) December 31, 2021 Collateral Dependent Loans Commercial loans $ 2,364 Discounted Discount for type of property, 14% - 15% (14%) Commercial real estate loans 16,308 Discounted Discount for type of property, 6% - 10% (8%) (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. Residential Loans Held For Sale Old National has elected the fair value option for residential 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 $1.8 million in 2022, $1.5 million in 2021, and $2.0 million in 2020. 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, 2022 Residential loans held for sale $ 11,926 $ 221 $ 11,705 December 31, 2021 Residential loans held for sale $ 35,458 $ 1,342 $ 34,116 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, 2022 Residential loans held for sale $ (1,127) $ 10 $ (4) $ (1,121) Year Ended December 31, 2021 Residential loans held for sale $ (2,139) $ 2 $ (6) $ (2,143) 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, 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 credit 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 interest-bearing deposits 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 Fair Value Measurements at December 31, 2021 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Cash, due from banks, money market, $ 822,019 $ 822,019 $ — $ — Loans, net: Commercial 3,363,175 — — 3,335,009 Commercial real estate 6,315,574 — — 6,211,854 Residential real estate 2,245,942 — — 2,216,900 Consumer credit 1,569,814 — — 1,582,600 Accrued interest receivable 84,109 688 35,790 47,631 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 6,303,106 $ 6,303,106 $ — $ — Checking, NOW, savings, and money market interest-bearing deposits 11,305,676 11,305,676 — — Time deposits 960,413 — 968,658 — Federal funds purchased and interbank borrowings 276 276 — — Securities sold under agreements to repurchase 392,275 392,275 — — FHLB advances 1,886,019 — 1,935,140 — Other borrowings 296,670 — 311,532 — Accrued interest payable 5,496 — 5,496 — Standby letters of credit 454 — — 454 Off-Balance Sheet Financial Instruments Commitments to extend credit $ — $ — $ — $ 4,678 The methods utilized to measure the fair value of financial instruments at December 31, 2022 and 2021 represent an approximation of exit price, however, an actual exit price may differ.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2022
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, 2022 and December 31, 2021. Interest rate collars and floors related to variable-rate commercial loan pools were designated as cash flow hedges totaling $1.9 billion notional amount at December 31, 2022 and $600.0 million notional amount at December 31, 2021. 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 $300.0 million notional amount at December 31, 2022 and $377.5 million notional amount at December 31, 2021. Interest rate swaps of certain available-for-sale investment securities were designated as fair value hedges totaling $910.0 million notional amount at both December 31, 2022 and December 31, 2021. 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, 2022 December 31, 2021 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 $ 1,900,000 $ 11,764 $ 47,859 $ 600,000 $ 459 $ 2,173 Interest rate swaps on borrowings (3) 150,000 — — 150,000 4,316 — Fair value hedges: Interest rate swaps on investment securities (3) 909,957 — — 909,957 10,961 14,643 Interest rate swaps on borrowings (3) 300,000 — — 377,500 2,475 96 Total $ 11,764 $ 47,859 $ 18,211 $ 16,912 (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) $ (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 Year Ended Interest rate contracts Interest income/(expense) $ 7,238 Fixed-rate debt Interest income/(expense) $ (7,283) Interest rate contracts Interest income/(expense) 973 Fixed-rate Interest income/(expense) (967) Total $ 8,211 $ (8,250) 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, 2022 2021 2020 2022 2021 2020 Derivatives in Location of Gain or Gain (Loss) Gain (Loss) Interest rate contracts Interest income/(expense) $ (45,132) $ 1,898 $ 8,261 $ (2,587) $ 4,605 $ 5,153 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 $4.5 million will be reclassified to interest income and $24.6 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, 2022, the notional amounts of the interest rate lock commitments were $21.4 million and forward commitments were $30.3 million. At December 31, 2021, the notional amounts of the interest rate lock commitments were $90.7 million and forward commitments were $126.1 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 $5.2 billion at December 31, 2022. The notional amounts of these customer derivative instruments and the offsetting counterparty derivative instruments were $2.4 billion at December 31, 2021. 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, 2022 December 31, 2021 Fair Value Fair Value (dollars in thousands) Notional Assets (1) Liabilities (2) Notional Assets (1) Liabilities (2) Interest rate lock commitments $ 21,401 $ 93 $ — $ 90,731 $ 2,352 $ — Forward mortgage loan contracts 30,330 32 — 126,107 242 — Customer interest rate swaps 5,220,363 5,676 326,924 2,433,177 52,439 11,658 Counterparty interest rate swaps (3) 5,220,363 151,111 5,711 2,433,177 583 12,956 Customer foreign currency forward contracts 8,341 253 42 10,292 399 — Counterparty foreign currency forward contracts 8,297 72 168 10,205 — 346 Total $ 157,237 $ 332,845 $ 56,015 $ 24,960 (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) 2022 2021 2020 Derivatives Not Designated as Location of Gain or (Loss) Gain (Loss) Interest rate contracts (1) Other income/(expense) $ 883 $ 279 $ (551) Mortgage contracts Mortgage banking revenue (2,468) (4,446) 5,692 Foreign currency contracts Other income/(expense) 98 (104) 13 Total $ (1,487) $ (4,271) $ 5,154 (1) Includes the valuation differences between the customer and offsetting swaps.

Commitments, Contingencies, and

Commitments, Contingencies, and Financial Guarantees	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies, and Financial Guarantees	COMMITMENTS, CONTINGENCIES, AND FINANCIAL GUARANTEES Litigation In the normal course of business, Old National Bancorp and its subsidiaries are subject to pending and threatened litigation, claims, investigations, and legal and administrative cases and proceedings. Certain of the actual or threatened legal actions may include claims for compensatory damages or claims for indeterminate amounts of damages. Old National contests liability and/or the amount of damages as appropriate in each pending matter. In view of the inherent difficulty of predicting the outcome of such matters, particularly in cases where claimants seek indeterminate damages or where investigations and proceedings are in the early stages, Old National cannot predict with certainty the loss or range of loss, if any, related to such matters, how or if such matters will be resolved, when they will ultimately be resolved, or what the eventual settlement, or other relief, if any, might be. Subject to the foregoing, Old National believes, based on current knowledge and after consultation with counsel, that the outcome of such pending matters are not expected to have a material adverse effect on the consolidated financial condition of Old National, although the outcome of such matters could be material to Old National’s operating results and cash flows for a particular future period, depending on, among other things, the level of Old National’s revenues or income for such period. Old National will accrue for a loss contingency if (1) it is probable that a future event will occur and confirm the loss and (2) the amount of the loss can be reasonably estimated. Old National is not currently involved in any material litigation. 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) 2022 2021 Unfunded loan commitments $ 8,979,334 $ 4,489,238 Standby letters of credit (1) 174,070 75,726 (1) Notional amount, which represents the maximum amount of future funding requirements. The carrying value was $0.8 million at December 31, 2022 and $0.5 million at December 31, 2021. At December 31, 2022, approximately 5% of the unfunded loan commitments had fixed rates, with the remainder having floating rates ranging from 0% to 21%. The allowance for unfunded loan commitments totaled $32.2 million at December 31, 2022 and $10.9 million at December 31, 2021. The increase in the allowance for credit losses on unfunded loan commitments was driven by the merger with First Midwest as well as organic loan growth. Old National is a party in risk participation transactions of interest rate swaps, which had total notional amounts of $398.9 million at December 31, 2022 and $97.7 million at December 31, 2021. Visa Class B Restricted Shares In 2008, Old National received Visa Class B restricted shares as part of Visa’s initial public offering. These shares are transferable only under limited circumstances until they can be converted into the publicly traded Class A common shares. This conversion will not occur until the final settlement of certain litigation for which Visa is indemnified by the holders of Visa’s Class B shares, including Old National. Visa funded an escrow account from its initial public offering to settle these litigation claims. Increases in litigation claims requiring Visa to fund the escrow account due to insufficient funds will result in a reduction of the conversion ratio of each Visa Class B share to unrestricted Class A shares. As of December 31, 2022, the conversion ratio was 1.5991. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation, the 65,466 Class B shares that Old National owns at December 31, 2022 are carried at a zero cost basis and are included in other assets with our equity securities that have no readily determinable fair value.

Regulatory Restrictions

Regulatory Restrictions	12 Months Ended
	Dec. 31, 2022
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract]
Regulatory Restrictions	REGULATORY RESTRICTIONS Restrictions on Cash and Due from Banks Prior to March 2020, Old National’s subsidiary bank was required to maintain reserve balances on hand and with the Federal Reserve Bank that are interest-bearing and unavailable for investment purposes. The Federal Reserve Board reduced reserve requirement ratios to 0% effective March 26, 2020. This action effectively eliminated reserve requirements for all depository institutions. Old National had no cash and due from banks which was held as collateral for collateralized swap positions at December 31, 2022 and $14.6 million at December 31, 2021. 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 2020, 2021, or 2022 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). 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. 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, 2022, 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, 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 December 31, 2021 Total capital to risk-weighted Old National Bancorp $ 2,119,176 12.77 % $ 1,741,789 10.50 % $ 1,658,847 10.00 % Old National Bank 2,119,405 12.82 1,735,385 10.50 1,652,748 10.00 Common equity Tier 1 capital Old National Bancorp 1,998,056 12.04 1,161,193 7.00 N/A N/A Old National Bank 2,040,285 12.34 1,156,923 7.00 1,074,286 6.50 Tier 1 capital to risk-weighted Old National Bancorp 1,998,056 12.04 1,410,020 8.50 995,308 6.00 Old National Bank 2,040,285 12.34 1,404,835 8.50 1,322,198 8.00 Tier 1 capital to average assets Old National Bancorp 1,998,056 8.59 930,318 4.00 N/A N/A Old National Bank 2,040,285 8.81 926,821 4.00 1,158,526 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, 2022
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) 2022 2021 Assets Deposits in affiliate bank $ 418,959 $ 102,953 Equity securities 30,717 3,257 Investment securities - available-for-sale 16,814 13,888 Investment in affiliates: Banking subsidiaries 5,000,153 3,053,575 Non-banks 44,938 4,949 Goodwill 59,506 — Other assets 135,025 83,531 Total assets $ 5,706,112 $ 3,262,153 Liabilities and Shareholders' Equity Other liabilities $ 92,758 $ 36,582 Other borrowings 484,759 213,553 Shareholders' equity 5,128,595 3,012,018 Total liabilities and shareholders' equity $ 5,706,112 $ 3,262,153 OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2022 2021 2020 Income Dividends from affiliates $ — $ 125,000 $ 230,000 Other income 1,733 3,364 4,196 Other income from affiliates 5 5 5 Total income 1,738 128,369 234,201 Expense Interest on borrowings 16,662 8,285 8,649 Other expenses 37,629 13,951 16,351 Total expense 54,291 22,236 25,000 Income (loss) before income taxes and equity in undistributed earnings of affiliates (52,553) 106,133 209,201 Income tax expense (benefit) (9,901) (5,113) (5,317) Income (loss) before equity in undistributed earnings of affiliates (42,652) 111,246 214,518 Equity in undistributed earnings of affiliates 470,939 166,292 11,891 Net income 428,287 277,538 226,409 Preferred dividends (14,118) — — Net income applicable to common shareholders $ 414,169 $ 277,538 $ 226,409 OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2022 2021 2020 Cash Flows From Operating Activities Net income $ 428,287 $ 277,538 $ 226,409 Adjustments to reconcile net income to cash Depreciation 26 30 46 Share-based compensation expense 28,656 7,497 7,707 (Increase) decrease in other assets (40,620) 10,213 (625) Increase (decrease) in other liabilities 10,455 (4,918) 1,084 Equity in undistributed earnings of affiliates (470,939) (166,292) (11,891) Net cash flows provided by (used in) operating activities (44,135) 124,068 222,730 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 4,431 Purchases of investment securities (9,000) (15) (10,073) Proceeds from sales of premises and equipment — — 354 Purchases of premises and equipment — (3) (354) Net cash flows provided by (used in) investing activities 608,137 1,522 (5,642) Cash Flows From Financing Activities Payments for maturities/redemptions of other borrowings — — (10,310) Cash dividends paid (177,623) (92,829) (92,946) Common stock repurchased (71,182) (3,731) (82,358) Common stock issued 809 583 577 Net cash flows provided by (used in) financing activities (247,996) (95,977) (185,037) Net increase (decrease) in cash and cash equivalents 316,006 29,613 32,051 Cash and cash equivalents at beginning of period 102,953 73,340 41,289 Cash and cash equivalents at end of period $ 418,959 $ 102,953 $ 73,340

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATIONOperating 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.  Old National Bank, Old National’s bank subsidiary, is the only significant subsidiary upon which management makes decisions regarding how to allocate resources and assess performance.  Each of the banking centers of Old National Bank provide a group of similar community banking services, including such products and services as commercial, real estate and consumer loans; time deposits; checking and savings accounts; cash management; and brokerage, trust, and investment advisory services.  The individual banking centers located throughout our Midwest region footprint have similar operating and economic characteristics.  While the chief decision maker monitors the revenue streams of the various products, services, and regional locations, operations are managed, and financial performance is evaluated on a Company-wide basis.  Accordingly, all of the community banking services and banking center locations are considered by management to be aggregated into one reportable operating segment, community banking.

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
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 significant 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
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. 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. Expected credit loss inherent in non-cancelable off-balance-sheet credit exposures is accounted for as a separate liability included in other liabilities on the balance sheet. 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. Old National has made a policy election to report accrued interest receivable as a separate line item on the balance sheet. The allowance for credit loss estimation process involves procedures to 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. Evaluations of the overall loan portfolio in future periods, 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 agreements that are commonly referred to as TBA (to be announced) forward agreements and 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. 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) 2022 2021 2020 Cash payments: Interest $ 118,165 $ 42,196 $ 70,043 Income taxes, net of refunds 66,109 31,875 24,436 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 16,661 Operating lease right-of-use assets obtained in exchange for lease obligations 28,265 776 (116) Finance lease right-of-use assets obtained in exchange for lease obligations (966) 7,477 5,225 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 management 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. 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. Investment product fees : Investment product fees are the commissions and fees received from a registered broker/dealer and investment adviser 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.
Impact of Accounting Changes	Impact of Accounting Changes Accounting Guidance Adopted in 2022 FASB ASC 470 and 815 – In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , to clarify the accounting for certain financial instruments with characteristics of liabilities and equity. The amendments in this update reduce the number of accounting models for convertible debt instruments and convertible preferred stock by removing the cash conversion model and the beneficial conversion feature model. In addition, this ASU improves disclosure requirements for convertible instruments and earnings-per-share guidance. The amendments in this update are effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. The adoption of this guidance on January 1, 2022 did not have a material impact on the consolidated financial statements. FASB ASC 842 – In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors—Certain Leases with Variable Lease Payments , to amend the lease classification requirements for lessors to align them with practice under ASC Topic 840. The amendments in this update are effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. The adoption of this guidance on January 1, 2022 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 the 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. Old National believes the adoption of this guidance on activities subsequent to December 31, 2022 will not have a material impact on the consolidated financial statements. Accounting Guidance Pending Adoption 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. Early adoption is permitted, including in any interim period. The new guidance is not expected to 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 renames 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. Early adoption is permitted for any entity that has adopted the amendments in ASU No. 2017-12 for the corresponding period. If an entity adopts the amendments in an interim period, the effect of adopting the amendments related to basis adjustments should be reflected as of the beginning of the fiscal year of adoption (i.e., the initial application date). Old National is currently evaluating the impact of adopting the new guidance 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. These amendments should be applied prospectively, except for the transition method related to the recognition and measurement of TDRs, which an entity has the option to apply a modified retrospective transition method resulting in a cumulative-effect adjustment to retained earnings in the period of adoption. Early adoption is permitted if an entity has adopted ASU No. 2016-13, including adoption in an interim period. If an entity elects to early adopt ASU No. 2022-02 in an interim period, the guidance should be applied as of the beginning of the fiscal year that includes the interim period. An entity may elect to early adopt the amendments about TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. Old National is currently evaluating the impact of adopting the new guidance on the consolidated financial statements. 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 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, 2022
Accounting Policies [Abstract]
Summary of Supplemental Cash Flow Information	The following table summarizes supplemental cash flow information: Years Ended December 31, (dollars in thousands) 2022 2021 2020 Cash payments: Interest $ 118,165 $ 42,196 $ 70,043 Income taxes, net of refunds 66,109 31,875 24,436 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 16,661 Operating lease right-of-use assets obtained in exchange for lease obligations 28,265 776 (116) Finance lease right-of-use assets obtained in exchange for lease obligations (966) 7,477 5,225 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.

Merger, Acquisition, and Dive_2

Merger, Acquisition, and Divestiture Activity (Tables)	12 Months Ended
	Dec. 31, 2022
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
Schedule of Pro Forma Information	The following table presents supplemental unaudited pro-forma financial information as if the First Midwest merger had occurred on January 1, 2021. The pro-forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction been effective as of this assumed date. Years Ended December 31, (dollars in thousands) 2022 2021 Total revenues (1) $ 1,812,333 $ 1,564,287 Income before income taxes 749,009 382,102 (1) Includes net interest income and total noninterest income .

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
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. The Company held no securities classified as held-to-maturity as of December 31, 2021. (dollars in thousands) Amortized Unrealized Unrealized Basis Adjustments (1) Fair 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 December 31, 2021 Available-for-Sale U.S. Treasury $ 234,555 $ 1,233 $ (7,751) $ 7,547 $ 235,584 U.S. government-sponsored entities and agencies 1,575,994 7,354 (37,014) (3,561) 1,542,773 Mortgage-backed securities - Agency 3,737,484 27,421 (66,074) — 3,698,831 States and political subdivisions 1,587,172 69,696 (1,882) — 1,654,986 Pooled trust preferred securities 13,756 — (4,260) — 9,496 Other securities 235,072 6,578 (1,254) — 240,396 Total available-for-sale securities $ 7,384,033 $ 112,282 $ (118,235) $ 3,986 $ 7,382,066 (1) Basis adjustments represent the cumulative fair value adjustments included in the carrying amounts of fixed-rate investment securities assets in fair value hedging arrangements .
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) 2022 2021 2020 Proceeds from sales of available-for-sale debt securities $ 20,032 $ 198,886 $ 299,885 Proceeds from calls of available-for-sale debt securities 70,808 158,818 465,179 Total $ 90,840 $ 357,704 $ 765,064 Realized gains on sales of available-for-sale debt securities $ 344 $ 4,188 $ 11,172 Realized gains on calls of available-for-sale debt securities 187 317 121 Realized losses on sales of available-for-sale debt securities (377) (145) (500) Realized losses on calls of available-for-sale debt securities (242) (33) (26) Debt securities gains (losses), net $ (88) $ 4,327 $ 10,767
Expected Maturities of Investment Securities Portfolio	Weighted average yield is based on amortized cost. At December 31, 2022 (dollars in thousands) Amortized Fair Weighted Maturity Available-for-Sale Within one year $ 108,432 $ 106,803 2.67 % One to five years 1,821,584 1,697,506 2.83 % Five to ten years 4,289,711 3,722,857 2.32 % Beyond ten years 1,552,876 1,246,546 2.52 % Total $ 7,772,603 $ 6,773,712 2.48 % Held-to-Maturity One to five years $ 71,144 $ 65,481 3.56 % Five to ten years 1,211,517 1,079,532 2.73 % Beyond ten years 1,806,486 1,498,669 2.83 % Total $ 3,089,147 $ 2,643,682 2.81 %
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, 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) December 31, 2021 Available-for-Sale U.S. Treasury $ 91,063 $ (7,751) $ — $ — $ 91,063 $ (7,751) U.S. government-sponsored entities 1,032,566 (21,167) 312,949 (15,847) 1,345,515 (37,014) Mortgage-backed securities - Agency 2,415,923 (59,277) 163,685 (6,797) 2,579,608 (66,074) States and political subdivisions 178,570 (1,849) 2,729 (33) 181,299 (1,882) Pooled trust preferred securities — — 9,496 (4,260) 9,496 (4,260) Other securities 56,976 (943) 21,133 (311) 78,109 (1,254) Total available-for-sale $ 3,775,098 $ (90,987) $ 509,992 $ (27,248) $ 4,285,090 $ (118,235)
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, 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, 2022
Receivables [Abstract]
Schedule of Composition of Loans and Impact of Adoption	The portfolio segment reclassifications follow: Statement Portfolio After (dollars in thousands) December 31, 2022 Commercial $ 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 $ 31,123,641 $ — $ 31,123,641 December 31, 2021 Commercial $ 3,391,769 $ (191,557) $ 3,200,212 Commercial real estate 6,380,674 (159,190) 6,221,484 BBCC N/A 350,747 350,747 Residential real estate 2,255,289 — 2,255,289 Consumer 1,574,114 (1,574,114) N/A Indirect N/A 873,139 873,139 Direct N/A 140,385 140,385 Home equity N/A 560,590 560,590 Total $ 13,601,846 $ — $ 13,601,846
Schedule of Composition of Loans	The composition of loans by portfolio segment follows: December 31, (dollars in thousands) 2022 2021 Commercial (1) (2) $ 9,298,624 $ 3,200,212 Commercial real estate 12,298,748 6,221,484 BBCC 368,602 350,747 Residential real estate 6,460,441 2,255,289 Indirect 1,034,257 873,139 Direct 629,186 140,385 Home equity 1,033,783 560,590 Total loans 31,123,641 13,601,846 Allowance for credit losses on loans (303,671) (107,341) Net loans $ 30,819,970 $ 13,494,505 (1) Includes direct finance leases of $188.1 million at December 31, 2022 and $25.1 million at December 31, 2021. (2) Includes remaining PPP loans of $32.5 million at December 31, 2022 and $169.0 million December 31, 2021.
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 Impact of Charge-offs Recoveries Provision Balance at 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 Year Ended December 31, 2020 Commercial $ 21,359 $ — $ 7,150 $ (5,593) $ 3,629 $ 4,022 $ 30,567 Commercial real estate 20,535 — 25,548 (4,323) 4,515 29,535 75,810 BBCC 2,279 — 3,702 (95) 140 94 6,120 Residential real estate 2,299 — 6,986 (824) 633 3,514 12,608 Indirect 5,319 — (1,669) (2,754) 1,922 762 3,580 Direct 1,863 — (1,059) (1,763) 819 995 855 Home equity 965 — 689 (201) 922 (527) 1,848 Total $ 54,619 $ — $ 41,347 $ (15,553) $ 12,580 $ 38,395 $ 131,388 Years Ended December 31, (dollars in thousands) 2022 2021 2020 Balance at beginning of period $ 10,879 $ 11,689 $ 2,656 Provision for credit losses on unfunded loan commitments 11,013 — — Impact of adopting ASC 326 — — 4,549 Provision for unfunded loan commitments 10,296 (810) 4,484 Balance at end of period $ 32,188 $ 10,879 $ 11,689
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 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 Origination Year Revolving to Term (dollars in thousands) 2021 2020 2019 2018 2017 Prior Revolving Total December 31, 2021 Commercial: Risk Rating: Pass $ 918,456 $ 563,869 $ 271,158 $ 98,468 $ 156,136 $ 235,639 $ 667,628 $ 130,470 $ 3,041,824 Criticized 9,998 7,885 6,660 — 7,809 2,658 14,601 10,076 59,687 Classified: Substandard 14,773 14,468 10,200 9,849 5,521 945 6,883 10,322 72,961 Nonaccrual 1,069 3,507 1,276 3,721 1,448 — 845 7,796 19,662 Doubtful — 178 — 288 337 5,275 — — 6,078 Total $ 944,296 $ 589,907 $ 289,294 $ 112,326 $ 171,251 $ 244,517 $ 689,957 $ 158,664 $ 3,200,212 Commercial real estate: Risk Rating: Pass $ 1,555,880 $ 1,474,271 $ 846,921 $ 481,508 $ 462,176 $ 611,680 $ 42,609 $ 451,544 $ 5,926,589 Criticized 27,622 24,790 39,914 — 21,614 22,157 — 34,387 170,484 Classified: Substandard 4,706 12,118 9,933 9,058 18,165 11,351 2,291 4,339 71,961 Nonaccrual 1,620 2,997 — 1,627 3,419 8,905 315 871 19,754 Doubtful 6,653 — 1,970 342 11,218 12,513 — — 32,696 Total $ 1,596,481 $ 1,514,176 $ 898,738 $ 492,535 $ 516,592 $ 666,606 $ 45,215 $ 491,141 $ 6,221,484 BBCC: Risk Rating: Pass $ 81,710 $ 69,749 $ 54,580 $ 34,461 $ 25,113 $ 8,296 $ 47,571 $ 18,778 $ 340,258 Criticized 1,320 1,170 841 160 — — 670 1,578 5,739 Classified: Substandard 284 24 79 7 187 465 103 239 1,388 Nonaccrual — 88 — — 66 162 — 1,136 1,452 Doubtful — 25 284 1,391 — 210 — — 1,910 Total $ 83,314 $ 71,056 $ 55,784 $ 36,019 $ 25,366 $ 9,133 $ 48,344 $ 21,731 $ 350,747 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) 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 Origination Year Revolving to Term 2021 2020 2019 2018 2017 Prior Revolving Total December 31, 2021 Residential real estate: Performing $ 625,582 $ 632,705 $ 272,600 $ 72,766 $ 103,866 $ 529,293 $ 12 $ 105 $ 2,236,929 Nonperforming 96 165 166 350 855 16,728 — — 18,360 Total $ 625,678 $ 632,870 $ 272,766 $ 73,116 $ 104,721 $ 546,021 $ 12 $ 105 $ 2,255,289 Indirect: Performing $ 361,485 $ 231,156 $ 146,978 $ 68,513 $ 41,598 $ 20,819 $ — $ 9 $ 870,558 Nonperforming 262 524 614 510 430 241 — — 2,581 Total $ 361,747 $ 231,680 $ 147,592 $ 69,023 $ 42,028 $ 21,060 $ — $ 9 $ 873,139 Direct: Performing $ 34,058 $ 16,135 $ 14,396 $ 14,579 $ 7,432 $ 15,831 $ 36,812 $ 192 $ 139,435 Nonperforming 13 53 130 133 35 536 42 8 950 Total $ 34,071 $ 16,188 $ 14,526 $ 14,712 $ 7,467 $ 16,367 $ 36,854 $ 200 $ 140,385 Home equity: Performing $ — $ — $ 633 $ 349 $ 535 $ — $ 539,057 $ 16,768 $ 557,342 Nonperforming — — 16 9 41 1 258 2,923 3,248 Total $ — $ — $ 649 $ 358 $ 576 $ 1 $ 539,315 $ 19,691 $ 560,590
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, 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 December 31, 2021 Commercial $ 2,723 $ 617 $ 1,603 $ 4,943 $ 3,195,269 $ 3,200,212 Commercial real estate 1,402 280 7,042 8,724 6,212,760 6,221,484 BBCC 747 162 109 1,018 349,729 350,747 Residential 8,273 2,364 4,554 15,191 2,240,098 2,255,289 Indirect 3,888 867 554 5,309 867,830 873,139 Direct 687 159 162 1,008 139,377 140,385 Home equity 693 199 777 1,669 558,921 560,590 Total $ 18,413 $ 4,648 $ 14,801 $ 37,862 $ 13,563,984 $ 13,601,846
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, 2022 December 31, 2021 (dollars in thousands) Nonaccrual Nonaccrual Past Due Nonaccrual Nonaccrual Past Due Commercial $ 60,372 $ 7,873 $ 152 $ 25,740 $ 9,574 $ — Commercial real estate 122,290 33,445 — 52,450 25,139 — BBCC 2,429 — — 3,362 — — Residential 34,660 — 1,808 18,360 — — Indirect 3,230 — 28 2,581 — 4 Direct 3,997 — 133 950 — 3 Home equity 11,200 — 529 3,248 — — Total $ 238,178 $ 41,318 $ 2,650 $ 106,691 $ 34,713 $ 7 Type of Collateral (dollars in thousands) Real Blanket Investment Auto Other 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 December 31, 2021 Commercial $ 8,100 $ 13,816 $ 3,394 $ 80 $ 302 Commercial Real Estate 38,657 — 961 — 6,653 BBCC 1,895 1,331 43 93 — Residential 18,360 — — — — Indirect — — — 2,581 — Direct 724 — 1 152 20 Home equity 3,248 — — — — Total $ 70,984 $ 15,147 $ 4,399 $ 2,906 $ 6,975
Schedule of Activity in Trouble Debt Restructurings	The following table presents activity in TDRs: (dollars in thousands) Beginning Balance (Charge-offs)/ Recoveries (Payments)/ Disbursements Additions Ending Balance Year Ended December 31, 2022 Commercial $ 7,456 $ — $ (6,880) $ 5,194 $ 5,770 Commercial real estate 17,158 4 (10,908) 21,982 28,236 BBCC 87 3 (16) — 74 Residential 2,435 — (169) — 2,266 Indirect — 1 (1) — — Direct 2,704 — (58) 194 2,840 Home equity 199 1 (84) — 116 Total $ 30,039 $ 9 $ (18,116) $ 27,370 $ 39,302 Year Ended December 31, 2021 Commercial $ 11,090 $ — $ (4,535) $ 901 $ 7,456 Commercial real estate 17,606 24 (2,166) 1,694 17,158 BBCC 112 8 (33) — 87 Residential 2,824 (4) (385) — 2,435 Indirect — 3 (3) — — Direct 739 2 (101) 2,064 2,704 Home equity 282 3 (86) — 199 Total $ 32,653 $ 36 $ (7,309) $ 4,659 $ 30,039 Year Ended December 31, 2020 Commercial $ 12,412 $ 633 $ (4,557) $ 2,602 $ 11,090 Commercial real estate 14,277 4,801 (8,502) 7,030 17,606 BBCC 578 (19) (447) — 112 Residential 3,107 — (283) — 2,824 Indirect — 9 (9) — — Direct 983 23 (267) — 739 Home equity 381 3 (102) — 282 Total $ 31,738 $ 5,450 $ (14,167) $ 9,632 $ 32,653
Schedule of Loans by Class Modified as Troubled Debt Restructuring	The following table presents loans modified as TDRs that occurred during the years ended December 31, 2022, 2021, and 2020: (dollars in thousands) Total Year Ended December 31, 2022 TDR: Number of loans 8 Pre-modification outstanding recorded investment $ 27,370 Post-modification outstanding recorded investment 27,370 Year Ended December 31, 2021 TDR: Number of loans 3 Pre-modification outstanding recorded investment $ 4,659 Post-modification outstanding recorded investment 4,659 Year Ended December 31, 2020 TDR: Number of loans 4 Pre-modification outstanding recorded investment $ 9,632 Post-modification outstanding recorded investment 9,632
Schedule of Credit Deteriorated Loans	Old National has purchased loans, for which there was, at acquisition, evidence of more than insignificant deterioration of credit quality since origination. The carrying amount of those loans is as follows: (dollars in thousands) First Midwest (1) Purchase price of loans at acquisition $ 1,390,273 Allowance for credit losses at acquisition 89,089 Non-credit discount/(premium) at acquisition 9,003 Par value of acquired loans at acquisition $ 1,488,365 (1) Old National merged with First Midwest effective February 15, 2022.

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	The composition of premises and equipment was as follows: December 31, (dollars in thousands) 2022 2021 Land $ 91,568 $ 71,014 Buildings 419,596 394,400 Furniture, fixtures, and equipment 154,719 118,124 Leasehold improvements 69,412 46,330 Total 735,295 629,868 Accumulated depreciation (177,988) (153,682) Premises and equipment, net $ 557,307 $ 476,186

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 2020 Operating lease cost Occupancy/Equipment expense $ 29,368 $ 12,336 $ 23,548 Finance lease cost: Amortization of right-of-use assets Occupancy expense 2,672 2,356 1,044 Interest on lease liabilities Interest expense 415 431 364 Sub-lease income Occupancy expense (448) (438) (512) Total $ 32,007 $ 14,685 $ 24,444
Schedule of Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: December 31, (dollars in thousands) 2022 2021 Operating Leases Operating lease right-of-use assets $ 189,714 $ 69,560 Operating lease liabilities 211,964 76,236 Finance Leases Premises and equipment, net 10,799 16,451 Other borrowings 13,469 17,233 Weighted-Average Remaining Lease Term (in Years) Operating leases 9.1 10.4 Finance leases 7.2 7.6 Weighted-Average Discount Rate Operating leases 2.88 % 3.34 % Finance leases 3.30 % 3.02 %
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) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 30,340 $ 13,823 $ 15,906 Operating cash flows from finance leases 415 431 364 Financing cash flows from finance leases 2,475 2,057 819
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, 2022: (dollars in thousands) Operating Finance 2023 $ 30,951 $ 2,600 2024 29,939 2,643 2025 28,635 2,645 2026 27,639 1,400 2027 26,604 1,381 Thereafter 98,539 4,525 Total undiscounted lease payments 242,307 15,194 Amounts representing interest (30,343) (1,725) Lease liability $ 211,964 $ 13,469

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 2020 Balance at beginning of period $ 1,036,994 $ 1,036,994 $ 1,036,994 Acquisitions and adjustments 961,722 — — Balance at end of period $ 1,998,716 $ 1,036,994 $ 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, 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 December 31, 2021 Core deposit $ 92,754 $ (60,036) $ 32,718 Customer trust relationships 16,547 (14,587) 1,960 Total intangible assets $ 109,301 $ (74,623) $ 34,678
Schedule of Estimated Amortization Expense for Future Years	Estimated amortization expense for future years is as follows: (dollars in thousands) 2023 $ 24,214 2024 21,298 2025 18,417 2026 15,614 2027 12,926 Thereafter 33,936 Total $ 126,405

Loan Servicing Rights (Tables)

Loan Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2022
Transfers and Servicing [Abstract]
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) 2022 2021 2020 Balance at beginning of period $ 30,085 $ 28,124 $ 25,399 Additions (1) 13,080 11,759 12,810 Amortization (5,898) (9,798) (10,085) Balance before valuation allowance at end of period 37,267 30,085 28,124 Valuation allowance: Balance at beginning of period (46) (1,407) (31) (Additions)/recoveries 46 1,361 (1,376) Balance at end of period — (46) (1,407) Loan servicing rights, net $ 37,267 $ 30,039 $ 26,717 (1) Additions in 2022 include 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, 2022
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, 2022 December 31, 2021 Investment Accounting Method Investment Unfunded Commitment (1) Investment Unfunded Commitment LIHTC Proportional amortization $ 84,428 $ 55,754 $ 68,989 $ 41,355 FHTC Equity 19,316 9,588 21,241 15,252 NMTC Consolidation 51,912 — 18,727 — Renewable Energy Equity 1,099 — 1,985 — Total $ 156,755 $ 65,342 $ 110,942 $ 56,607 (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, 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) Year Ended December 31, 2020 LIHTC $ 3,105 $ (4,071) FHTC 13,237 (15,582) NMTC 900 (1,100) Renewable Energy 4,651 (4,122) Total $ 21,893 $ (24,875) (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, 2022
Deposits [Abstract]
Schedule of Maturities of Total Time Deposits	At December 31, 2022, the scheduled maturities of total time deposits were as follows: (dollars in thousands) Due in 2023 $ 2,099,157 Due in 2024 684,377 Due in 2025 118,776 Due in 2026 64,207 Due in 2027 41,794 Thereafter 5,469 Total $ 3,013,780

Securities Sold Under Agreeme_2

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2022
Securities Sold under Agreements to Repurchase [Abstract]
Schedule Of Securities Sold Under Agreements To Repurchase And Weighted Average Interest Rates Table Text Block	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) 2022 2021 Outstanding at year-end $ 432,804 $ 392,275 Average amount outstanding 440,619 392,777 Maximum amount outstanding at any month-end 509,275 405,278 Weighted-average interest rate: During year 0.19 % 0.10 % End of year 1.31 0.10
Schedule Of Remaining Contractual Maturity Of Secured Borrowings And Class Of Collateral Pledged Under Repurchase Agreements Table Text Block	The following table presents the contractual maturity of our secured borrowings and class of collateral pledged: At December 31, 2022 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 $ 432,804 $ — $ — $ — $ 432,804 Total $ 432,804 $ — $ — $ — $ 432,804

Federal Home Loan Bank Advanc_2

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 FHLB advances (fixed rates 0.00% to 4.96% and variable rates 3.90% to 4.17%) maturing January 2023 to September 2042 $ 3,850,677 $ 1,902,655 Fair value hedge basis adjustments and unamortized (21,659) (16,636) Total other borrowings $ 3,829,018 $ 1,886,019
Summary of Contractual Maturities of FHLB Advances	Contractual maturities of FHLB advances at December 31, 2022 were as follows: (dollars in thousands) Due in 2023 $ 950,149 Due in 2024 25,243 Due in 2025 550,285 Due in 2026 100,000 Thereafter 2,225,000 Fair value hedge basis adjustments and unamortized prepayment fees (21,659) Total $ 3,829,018

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Summary of Other Borrowings	The following table summarizes Old National’s other borrowings: December 31, (dollars in thousands) 2022 2021 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 (247) (403) Subordinated debentures (fixed rate 5.875%) maturing September 2026 150,000 — Junior subordinated debentures (variable rates of 5.68% to 7.99%) maturing July 2031 to September 2037 136,643 42,000 Other basis adjustments 23,363 (3,044) Old National Bank: Finance lease liabilities 13,469 17,233 Subordinated debentures (variable rate 8.77%) 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 143,187 51,045 Other (1) 89,588 2,839 Total other borrowings $ 743,003 $ 296,670 (1) Includes overnight borrowings to collateralize certain derivative positions totaling $88.0 million at December 31, 2022. The following table summarizes the terms of our outstanding junior subordinated debentures as of December 31, 2022: (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 LIBOR plus 3.58% 7.99 % July 31, 2031 Bridgeview Capital Trust II December 2002 15,464 3-month LIBOR plus 3.35% 7.43 % 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 LIBOR plus 1.75% 6.49 % March 17, 2035 Northern States Statutory Trust I September 2005 10,310 3-month LIBOR plus 1.80% 6.57 % September 15, 2035 Anchor Capital Trust III August 2005 5,000 3-month LIBOR plus 1.55% 6.30 % September 30, 2035 Great Lakes Statutory Trust II December 2005 6,186 3-month LIBOR plus 1.40% 6.17 % December 15, 2035 Home Federal Statutory September 2006 15,464 3-month LIBOR plus 1.65% 6.42 % September 15, 2036 Monroe Bancorp Capital July 2006 3,093 3-month LIBOR plus 1.60% 5.68 % October 7, 2036 Tower Capital Trust 3 December 2006 9,279 3-month LIBOR plus 1.69% 6.45 % March 1, 2037 Monroe Bancorp Statutory March 2007 5,155 3-month LIBOR plus 1.60% 6.37 % June 15, 2037 Great Lakes Statutory Trust III June 2007 8,248 3-month LIBOR plus 1.70% 6.47 % 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) 2022 2021 Unfunded loan commitments $ 8,979,334 $ 4,489,238 Standby letters of credit (1) 174,070 75,726 (1) Notional amount, which represents the maximum amount of future funding requirements. The carrying value was $0.8 million at December 31, 2022 and $0.5 million at December 31, 2021.
Summary of Contractual Maturities of Other Borrowings	Contractual maturities of other borrowings at December 31, 2022 were as follows: (dollars in thousands) Due in 2023 $ 90,276 Due in 2024 177,335 Due in 2025 14,389 Due in 2026 151,188 Due in 2027 1,209 Thereafter 283,934 Unamortized debt issuance costs and other basis adjustments 24,672 Total $ 743,003

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 Balance at beginning of period $ (2,950) $ — $ 543 $ 32 $ (2,375) Other comprehensive income (loss) before reclassifications (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 reclassifications (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) Year Ended December 31, 2020 Balance at beginning of period $ 56,131 $ — $ 240 $ (164) $ 56,207 Other comprehensive income (loss) before reclassifications 97,596 — 6,230 — 103,826 Amounts reclassified from AOCI to income (1) (8,392) — (3,886) 16 (12,262) Balance at end of period $ 145,335 $ — $ 2,584 $ (148) $ 147,771 (1) See table below for details about reclassifications to income.
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) 2022 2021 2020 Details about AOCI Components Amount Reclassified Affected Line Item in the Unrealized gains and losses on $ (88) $ 4,327 $ 10,767 Debt securities gains (losses), net 21 (990) (2,375) Income tax (expense) benefit $ (67) $ 3,337 $ 8,392 Net income Unrealized gains and losses on $ (16,612) $ — $ — Interest income (expense) 4,047 — — Income tax (expense) benefit $ (12,565) $ — $ — Net income Gains and losses on cash flow hedges $ (2,587) $ 4,605 $ 5,153 Interest income (expense) 636 (1,131) (1,267) Income tax (expense) benefit $ (1,951) $ 3,474 $ 3,886 Net income Amortization of defined benefit Actuarial gains (losses) $ (139) $ (239) $ (21) Salaries and employee benefits 34 59 5 Income tax (expense) benefit $ (105) $ (180) $ (16) Net income Total reclassifications for the period $ (14,688) $ 6,631 $ 12,262 Net income

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 2020 Provision at statutory rate of 21% $ 114,394 $ 71,161 $ 53,667 Tax-exempt income: Tax-exempt interest (14,588) (11,066) (10,776) Section 291/265 interest disallowance 363 114 189 Company-owned life insurance income (2,891) (2,138) (2,290) Tax-exempt income (17,116) (13,090) (12,877) State income taxes 20,837 9,308 4,840 Tax credit investments - federal (9,140) (5,212) (15,159) Officer compensation limitation 5,903 564 598 Other, net 1,568 (1,407) (1,922) Income tax expense $ 116,446 $ 61,324 $ 29,147 Effective tax rate 21.4 % 18.1 % 11.4 %
Provision for Income Taxes	The provision for income taxes consisted of the following components: Years Ended December 31, (dollars in thousands) 2022 2021 2020 Current expense: Federal $ 106,918 $ 31,943 $ 19,223 State 32,898 8,461 6,498 Deferred expense: Federal (16,216) 17,514 3,188 State (7,154) 3,406 238 Deferred income tax expense (23,370) 20,920 3,426 Income tax expense $ 116,446 $ 61,324 $ 29,147
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) 2022 2021 Deferred Tax Assets Allowance for credit losses on loans, net of recapture $ 85,619 $ 28,843 Benefit plan accruals 38,038 18,348 Net operating loss carryforwards 25,135 14,823 Acquired loans 40,723 8,039 Operating lease liabilities 58,288 22,961 Unrealized losses on available-for-sale investment securities 202,101 3,003 Unrealized losses on held-to-maturity investment securities 36,197 — Unrealized losses on hedges 10,277 — Purchase accounting 20,063 — Other, net 4,962 3,430 Total deferred tax assets 521,403 99,447 Deferred Tax Liabilities Deferred loan origination fees (3,566) — Purchase accounting — (18,524) Loan servicing rights (9,636) (7,379) Premises and equipment (14,844) (16,972) Prepaid expenses (2,774) (796) Operating lease right-of-use assets (51,845) (21,129) Unrealized gains on hedges — (177) Other, net (2,983) (1,564) Total deferred tax liabilities (85,648) (66,541) Net deferred tax assets $ 435,755 $ 32,906
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) 2022 2021 2020 Balance at beginning of period $ — $ — $ — Additions for acquired uncertain tax positions 14,897 — — Reductions for tax positions relating to prior years (2,751) — — Reductions due to statute of limitations expiring (1,139) — — Balance at end of period $ 11,007 $ — $ —

Share-Based Compensation and _2

Share-Based Compensation and Other Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Changes in Nonvested Restricted Stock Awards	A summary of changes in our nonvested shares for the year follows: (shares in thousands) Shares Weighted Year Ended December 31, 2022 Unvested balance at beginning of period 554 $16.16 Granted during the year (1) 1,916 18.12 Vested during the year (453) 17.29 Forfeited during the year (148) 17.88 Unvested balance at end of period 1,869 $17.76 (1) In connection with the First Midwest merger, each restricted stock award of First Midwest common stock that was outstanding, unvested, and unsettled at the merger date was assumed and converted into a number of Old National restricted stock relating to a number of shares of Old National common stock equal to the number of First Midwest restricted stock multiplied by the exchange ratio (rounded up to the nearest whole number) subject to the same vesting terms and conditions, resulting in an issuance of an aggregate 0.9 million restricted stock awards of Old National common stock.
Summary of Changes in Nonvested Restricted Shares	A summary of changes in our unvested shares for the year follows: (shares in thousands) Shares Weighted Year Ended December 31, 2022 Unvested balance at beginning of period 886 $14.80 Granted during the year (1) 1,935 17.66 Vested during the year (720) 15.41 Forfeited during the year (73) 16.73 Dividend equivalents adjustment 53 16.82 Unvested balance at end of period 2,081 $17.23 (1) In connection with the First Midwest merger, each performance-based restricted stock unit award of First Midwest that was outstanding, unvested, and unsettled at the merger date was assumed and converted into a time-based restricted stock unit award of Old National common stock subject to the same vesting terms and conditions (other than performance conditions), resulting in an issuance of an aggregate 0.7 million restricted stock units of Old National common stock. The performance components of the First Midwest equity awards were deemed earned at target.
Summary of Activity in Stock Option Plan	A summary of the activity in stock appreciation rights in 2022 follows: (shares in thousands) Shares Weighted Weighted Aggregate Year Ended December 31, 2022 Outstanding at beginning of period 28 $4.30 Exercised (22) 3.95 Outstanding at end of period 6 $5.67 0.18 $71.2 Options exercisable at end of year 6 $5.67 0.18 $71.2
Schedule of Information Related to Stock Option Plan	Information related to stock option and appreciation rights follows: Year Ended December 31, (dollars in thousands) 2022 2021 2020 Intrinsic value of options/appreciation rights exercised $ 331 $ 171 $ 213 Tax benefit realized from options/appreciation rights exercises 132 68 85

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 2020 Net income $ 428,287 $ 277,538 $ 226,409 Preferred dividends (14,118) — — Net income applicable to common shares $ 414,169 $ 277,538 $ 226,409 Weighted average common shares outstanding: Weighted average common shares outstanding (basic) 275,179 165,178 165,509 Effect of dilutive securities: Restricted stock 1,502 729 632 Stock appreciation rights 7 22 36 Weighted average diluted shares outstanding 276,688 165,929 166,177 Basic Net Income Per Common Share $ 1.51 $ 1.68 $ 1.37 Diluted Net Income Per Common Share $ 1.50 $ 1.67 $ 1.36

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 Using (dollars in thousands) Carrying Value 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 — Residential loans held for sale 11,926 — 11,926 — Derivative assets 169,001 — 169,001 — Financial Liabilities Derivative liabilities 380,704 — 380,704 — Fair Value Measurements at December 31, 2021 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Equity securities $ 13,211 $ 13,211 $ — $ — Investment securities available-for-sale: U.S. Treasury 235,584 235,584 — — U.S. government-sponsored entities and agencies 1,542,773 — 1,542,773 — Mortgage-backed securities - Agency 3,698,831 — 3,698,831 — States and political subdivisions 1,654,986 — 1,654,986 — Pooled trust preferred securities 9,496 — — 9,496 Other securities 240,396 — 240,396 — Residential loans held for sale 35,458 — 35,458 — Derivative assets 74,226 — 74,226 — Financial Liabilities Derivative liabilities 41,872 — 41,872 —
Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)	The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3): (dollars in thousands) Pooled Trust States and Year Ended December 31, 2022 Balance at beginning of period $ 9,496 $ — Accretion (amortization) of discount or premium 12 — Increase (decrease) in fair value of securities 1,593 — Transfers out of Level 3 (11,101) — Balance at end of period $ — $ — Year Ended December 31, 2021 Balance at beginning of period $ 7,913 $ — Accretion (amortization) of discount or premium 20 — Sales/payments received (27) — Increase (decrease) in fair value of securities 1,590 — Balance at end of period $ 9,496 $ — Year Ended December 31, 2020 Balance at beginning of period $ 8,222 $ 40 Accretion (amortization) of discount or premium 15 — Sales/payments received (64) (40) Increase (decrease) in fair value of securities (260) — Balance at end of period $ 7,913 $ —
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 Value Valuation Unobservable Input Range (Weighted Average) (4) December 31, 2021 Pooled trust preferred securities $ 9,496 Discounted cash flow Constant prepayment rate (1) 0.0% Additional asset defaults (2) 5.7% - 8.5% (6.5%) Expected asset recoveries (3) 0.0% - 46.0% (14.1%) (1) Assuming no prepayments. (2) Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50%, or 100%. (3) Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25%, or 100%. (4) Unobservable inputs are weighted by the estimated number of defaults and current performing collateral of the instruments. 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, 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%) December 31, 2021 Collateral Dependent Loans Commercial loans $ 2,364 Discounted Discount for type of property, 14% - 15% (14%) Commercial real estate loans 16,308 Discounted Discount for type of property, 6% - 10% (8%) (1) Unobservable inputs were weighted by the relative fair value of the instruments.
Assets Measured at Fair Value on a Non-Recurring Basis	Assets measured at fair value on a non-recurring basis are summarized below: Fair Value Measurements at December 31, 2022 Using (dollars in thousands) Carrying Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Significant Unobservable Inputs Collateral Dependent Loans: Commercial loans $ 22,562 $ — $ — $ 22,562 Commercial real estate loans 48,026 — — 48,026 Assets measured at fair value on a non-recurring basis at December 31, 2021 are summarized below: Fair Value Measurements at December 31, 2021 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Collateral Dependent Loans: Commercial loans $ 2,364 $ — $ — $ 2,364 Commercial real estate loans 16,308 — — 16,308 Loan servicing rights 140 — 140 —
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, 2022 Residential loans held for sale $ 11,926 $ 221 $ 11,705 December 31, 2021 Residential loans held for sale $ 35,458 $ 1,342 $ 34,116 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, 2022 Residential loans held for sale $ (1,127) $ 10 $ (4) $ (1,121) Year Ended December 31, 2021 Residential loans held for sale $ (2,139) $ 2 $ (6) $ (2,143)
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, 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 credit 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 interest-bearing deposits 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 Fair Value Measurements at December 31, 2021 Using (dollars in thousands) Carrying Quoted Prices in Significant Significant Financial Assets Cash, due from banks, money market, $ 822,019 $ 822,019 $ — $ — Loans, net: Commercial 3,363,175 — — 3,335,009 Commercial real estate 6,315,574 — — 6,211,854 Residential real estate 2,245,942 — — 2,216,900 Consumer credit 1,569,814 — — 1,582,600 Accrued interest receivable 84,109 688 35,790 47,631 Financial Liabilities Deposits: Noninterest-bearing demand deposits $ 6,303,106 $ 6,303,106 $ — $ — Checking, NOW, savings, and money market interest-bearing deposits 11,305,676 11,305,676 — — Time deposits 960,413 — 968,658 — Federal funds purchased and interbank borrowings 276 276 — — Securities sold under agreements to repurchase 392,275 392,275 — — FHLB advances 1,886,019 — 1,935,140 — Other borrowings 296,670 — 311,532 — Accrued interest payable 5,496 — 5,496 — Standby letters of credit 454 — — 454 Off-Balance Sheet Financial Instruments Commitments to extend credit $ — $ — $ — $ 4,678

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 December 31, 2021 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 $ 1,900,000 $ 11,764 $ 47,859 $ 600,000 $ 459 $ 2,173 Interest rate swaps on borrowings (3) 150,000 — — 150,000 4,316 — Fair value hedges: Interest rate swaps on investment securities (3) 909,957 — — 909,957 10,961 14,643 Interest rate swaps on borrowings (3) 300,000 — — 377,500 2,475 96 Total $ 11,764 $ 47,859 $ 18,211 $ 16,912 (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) $ (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 Year Ended Interest rate contracts Interest income/(expense) $ 7,238 Fixed-rate debt Interest income/(expense) $ (7,283) Interest rate contracts Interest income/(expense) 973 Fixed-rate Interest income/(expense) (967) Total $ 8,211 $ (8,250) 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, 2022 2021 2020 2022 2021 2020 Derivatives in Location of Gain or Gain (Loss) Gain (Loss) Interest rate contracts Interest income/(expense) $ (45,132) $ 1,898 $ 8,261 $ (2,587) $ 4,605 $ 5,153 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) 2022 2021 2020 Derivatives Not Designated as Location of Gain or (Loss) Gain (Loss) Interest rate contracts (1) Other income/(expense) $ 883 $ 279 $ (551) Mortgage contracts Mortgage banking revenue (2,468) (4,446) 5,692 Foreign currency contracts Other income/(expense) 98 (104) 13 Total $ (1,487) $ (4,271) $ 5,154 (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, 2022 December 31, 2021 Fair Value Fair Value (dollars in thousands) Notional Assets (1) Liabilities (2) Notional Assets (1) Liabilities (2) Interest rate lock commitments $ 21,401 $ 93 $ — $ 90,731 $ 2,352 $ — Forward mortgage loan contracts 30,330 32 — 126,107 242 — Customer interest rate swaps 5,220,363 5,676 326,924 2,433,177 52,439 11,658 Counterparty interest rate swaps (3) 5,220,363 151,111 5,711 2,433,177 583 12,956 Customer foreign currency forward contracts 8,341 253 42 10,292 399 — Counterparty foreign currency forward contracts 8,297 72 168 10,205 — 346 Total $ 157,237 $ 332,845 $ 56,015 $ 24,960 (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.

Commitments, Contingencies, a_2

Commitments, Contingencies, and Financial Guarantees (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Summary of Loan Commitments	The following table summarizes Old National’s other borrowings: December 31, (dollars in thousands) 2022 2021 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 (247) (403) Subordinated debentures (fixed rate 5.875%) maturing September 2026 150,000 — Junior subordinated debentures (variable rates of 5.68% to 7.99%) maturing July 2031 to September 2037 136,643 42,000 Other basis adjustments 23,363 (3,044) Old National Bank: Finance lease liabilities 13,469 17,233 Subordinated debentures (variable rate 8.77%) 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 143,187 51,045 Other (1) 89,588 2,839 Total other borrowings $ 743,003 $ 296,670 (1) Includes overnight borrowings to collateralize certain derivative positions totaling $88.0 million at December 31, 2022. The following table summarizes the terms of our outstanding junior subordinated debentures as of December 31, 2022: (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 LIBOR plus 3.58% 7.99 % July 31, 2031 Bridgeview Capital Trust II December 2002 15,464 3-month LIBOR plus 3.35% 7.43 % 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 LIBOR plus 1.75% 6.49 % March 17, 2035 Northern States Statutory Trust I September 2005 10,310 3-month LIBOR plus 1.80% 6.57 % September 15, 2035 Anchor Capital Trust III August 2005 5,000 3-month LIBOR plus 1.55% 6.30 % September 30, 2035 Great Lakes Statutory Trust II December 2005 6,186 3-month LIBOR plus 1.40% 6.17 % December 15, 2035 Home Federal Statutory September 2006 15,464 3-month LIBOR plus 1.65% 6.42 % September 15, 2036 Monroe Bancorp Capital July 2006 3,093 3-month LIBOR plus 1.60% 5.68 % October 7, 2036 Tower Capital Trust 3 December 2006 9,279 3-month LIBOR plus 1.69% 6.45 % March 1, 2037 Monroe Bancorp Statutory March 2007 5,155 3-month LIBOR plus 1.60% 6.37 % June 15, 2037 Great Lakes Statutory Trust III June 2007 8,248 3-month LIBOR plus 1.70% 6.47 % 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) 2022 2021 Unfunded loan commitments $ 8,979,334 $ 4,489,238 Standby letters of credit (1) 174,070 75,726 (1) Notional amount, which represents the maximum amount of future funding requirements. The carrying value was $0.8 million at December 31, 2022 and $0.5 million at December 31, 2021.

Regulatory Restrictions (Tables

Regulatory Restrictions (Tables)	12 Months Ended
	Dec. 31, 2022
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, 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 December 31, 2021 Total capital to risk-weighted Old National Bancorp $ 2,119,176 12.77 % $ 1,741,789 10.50 % $ 1,658,847 10.00 % Old National Bank 2,119,405 12.82 1,735,385 10.50 1,652,748 10.00 Common equity Tier 1 capital Old National Bancorp 1,998,056 12.04 1,161,193 7.00 N/A N/A Old National Bank 2,040,285 12.34 1,156,923 7.00 1,074,286 6.50 Tier 1 capital to risk-weighted Old National Bancorp 1,998,056 12.04 1,410,020 8.50 995,308 6.00 Old National Bank 2,040,285 12.34 1,404,835 8.50 1,322,198 8.00 Tier 1 capital to average assets Old National Bancorp 1,998,056 8.59 930,318 4.00 N/A N/A Old National Bank 2,040,285 8.81 926,821 4.00 1,158,526 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, 2022
Condensed Financial Information Disclosure [Abstract]
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) 2022 2021 Assets Deposits in affiliate bank $ 418,959 $ 102,953 Equity securities 30,717 3,257 Investment securities - available-for-sale 16,814 13,888 Investment in affiliates: Banking subsidiaries 5,000,153 3,053,575 Non-banks 44,938 4,949 Goodwill 59,506 — Other assets 135,025 83,531 Total assets $ 5,706,112 $ 3,262,153 Liabilities and Shareholders' Equity Other liabilities $ 92,758 $ 36,582 Other borrowings 484,759 213,553 Shareholders' equity 5,128,595 3,012,018 Total liabilities and shareholders' equity $ 5,706,112 $ 3,262,153
Condensed Statements of Income	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2022 2021 2020 Income Dividends from affiliates $ — $ 125,000 $ 230,000 Other income 1,733 3,364 4,196 Other income from affiliates 5 5 5 Total income 1,738 128,369 234,201 Expense Interest on borrowings 16,662 8,285 8,649 Other expenses 37,629 13,951 16,351 Total expense 54,291 22,236 25,000 Income (loss) before income taxes and equity in undistributed earnings of affiliates (52,553) 106,133 209,201 Income tax expense (benefit) (9,901) (5,113) (5,317) Income (loss) before equity in undistributed earnings of affiliates (42,652) 111,246 214,518 Equity in undistributed earnings of affiliates 470,939 166,292 11,891 Net income 428,287 277,538 226,409 Preferred dividends (14,118) — — Net income applicable to common shareholders $ 414,169 $ 277,538 $ 226,409
Condensed Statement of Cash Flows	OLD NATIONAL BANCORP (PARENT COMPANY ONLY) Years Ended December 31, (dollars in thousands) 2022 2021 2020 Cash Flows From Operating Activities Net income $ 428,287 $ 277,538 $ 226,409 Adjustments to reconcile net income to cash Depreciation 26 30 46 Share-based compensation expense 28,656 7,497 7,707 (Increase) decrease in other assets (40,620) 10,213 (625) Increase (decrease) in other liabilities 10,455 (4,918) 1,084 Equity in undistributed earnings of affiliates (470,939) (166,292) (11,891) Net cash flows provided by (used in) operating activities (44,135) 124,068 222,730 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 4,431 Purchases of investment securities (9,000) (15) (10,073) Proceeds from sales of premises and equipment — — 354 Purchases of premises and equipment — (3) (354) Net cash flows provided by (used in) investing activities 608,137 1,522 (5,642) Cash Flows From Financing Activities Payments for maturities/redemptions of other borrowings — — (10,310) Cash dividends paid (177,623) (92,829) (92,946) Common stock repurchased (71,182) (3,731) (82,358) Common stock issued 809 583 577 Net cash flows provided by (used in) financing activities (247,996) (95,977) (185,037) Net increase (decrease) in cash and cash equivalents 316,006 29,613 32,051 Cash and cash equivalents at beginning of period 102,953 73,340 41,289 Cash and cash equivalents at end of period $ 418,959 $ 102,953 $ 73,340

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, 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, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash payments:
Interest	$ 118,165	$ 42,196	$ 70,043
Income taxes, net of refunds	66,109	31,875	24,436
Noncash Investing and Financing Activities:
Securities transferred from available-for-sale to held-to-maturity	2,986,736	0	0
Transfer of premises and equipment to assets held for sale	7,905	9,539	16,661
Operating lease right-of-use assets obtained in exchange for lease obligations	28,265	776
Operating lease right-of-use assets obtained in exchange for lease obligations			(116)
Finance lease right-of-use assets obtained in exchange for lease obligations	$ (966)	$ 7,477	$ 5,225

Merger, Acquisition, and Dive_3

Merger, Acquisition, and Divestiture Activity - Additional Information (Details) $ in Thousands				3 Months Ended	11 Months Ended	12 Months Ended
	Nov. 18, 2022 USD ($)	Feb. 15, 2022 USD ($) agreement shares	May 30, 2021 shares	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) branch	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Number of deposit agreements (in agreements) | agreement		2
Purchase price of loans at acquisition		$ 1,400,000				$ 1,390,273
Par value of acquired loans at acquisition		1,500,000				1,488,365
Allowance for credit losses at acquisition		$ 89,100				89,089
Plan assets				$ 16,600	$ 16,600	16,600
Allowance for credit losses				303,671	303,671	303,671	$ 107,341	$ 131,388	$ 54,619
Deposits, health savings accounts	$ 382,000
Gain on sale of health savings accounts	$ 90,700					90,673	0	0
Property optimization				26,800		26,818	$ 0	$ 27,050
Number of banking centers to be closed | branch								31
Series A Preferred Stock
Business Acquisition [Line Items]
Shares issued for acquisition (in shares) | shares		108,000
Depositary shares, interest in non-cumulative perpetual preferred stock		2.50%
Series C Preferred Stock
Business Acquisition [Line Items]
Shares issued for acquisition (in shares) | shares		122,500
Depositary shares, interest in non-cumulative perpetual preferred stock		2.50%
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series A
Business Acquisition [Line Items]
Shares issued for acquisition (in shares) | shares		4,320,000
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series C
Business Acquisition [Line Items]
Shares issued for acquisition (in shares) | shares		4,900,000
First Midwest
Business Acquisition [Line Items]
Shares exchange ratio			1.1336
Number of shares to be received upon conversion (in shares) | shares			1
Increase in goodwill					1,600
Other intangible assets		$ 117,584
Transaction costs, expensed						120,900
Transaction costs						120,900
Allowance for credit losses				96,300	96,300	96,300
First Midwest | Unfunded Loan Commitment
Business Acquisition [Line Items]
Allowance for credit losses				$ 11,000	$ 11,000	$ 11,000
First Midwest | Core deposit
Business Acquisition [Line Items]
Other intangible assets		$ 77,900
Estimated useful lives		10 years
First Midwest | Customer trust relationships
Business Acquisition [Line Items]
Other intangible assets		$ 39,700
Estimated useful lives		13 years
First Midwest | Series A Preferred Stock
Business Acquisition [Line Items]
Dividend rate			7%
First Midwest | Series C Preferred Stock
Business Acquisition [Line Items]
Dividend rate			7%

Merger, Acquisition, and Dive_4

Merger, Acquisition, and Divestiture Activity - Total Consideration (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Feb. 15, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Goodwill		$ 1,998,716	$ 1,036,994	$ 1,036,994	$ 1,036,994
Fair value of consideration
Issuance of common stock		2,446,312
Common Stock
Fair value of consideration
Issuance of common stock	$ 129,365	129,365
Share price (in dollars per share)	$ 18.92
First Midwest
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	$ 111,900
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
Total consideration	$ 2,690,182
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

Merger, Acquisition, and Dive_5

Merger, Acquisition, and Divestiture Activity - Pro Forma (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business Combination and Asset Acquisition [Abstract]
Total revenues	$ 1,812,333	$ 1,564,287
Income before income taxes	$ 749,009	$ 382,102

Merger, Acquisition, and Dive_6

Merger, Acquisition, and Divestiture Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 branch	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Total loans		$ 31,123,641	$ 13,601,846
Assets		46,763,372	24,453,564
Deposits		$ 35,000,830	$ 18,569,195
Number of banking centers to be closed | branch	31

Investment Securities - Additio

Investment Securities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summary of Investment Holdings [Line Items]
Investment securities held to maturity	$ 3,089,147,000	$ 0
Fair value of securities transferred to held-for-maturity	3,000,000,000
Unrealized loss	125,200,000
Securities pledged to secure public and other funds, carrying value	6,100,000,000	2,700,000,000
Transfers from available-for-sale to held-to-maturity	(148,900,000)
Allowance for credit losses for available-for-sale debt securities	0	$ 0
Allowance for securities held-to-maturity	$ (150,000)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Accrued interest receivable	$ 50,900,000	$ 35,500,000
Number of securities in security portfolio | security	3,150
Number of securities in unrealized loss position | security	2,803
Equity securities, at fair value	$ 52,507,000	13,211,000
(Losses) gains on equity securities	(4,900,000)	200,000	$ 1,400,000
Impairments on equity securities without readily determinable fair value	0	0	$ 100,000
Downward adjustments on equity securities without readily determinable fair value	0	0
Other Assets
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	396,800,000	$ 186,000,000
Other Assets | Partnership Interest
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	240,100,000
Other Assets | Initiatives in Low-to-Moderate Income Neighborhoods
Summary of Investment Holdings [Line Items]
Equity securities without readily determinable fair value	156,800,000
Indiana
Summary of Investment Holdings [Line Items]
Investment securities issued by states and political subdivisions, market value	$ 628,600,000
State and political subdivision investment, equity percentage	12.30%
Percentage of municipal bonds rated A or better	99.70%
Percentage of non rated local interest bonds	0.30%

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Available-for-Sale
Amortized Cost	$ 7,772,603,000	$ 7,384,033,000
Unrealized Gains	3,028,000	112,282,000
Unrealized Losses	(847,474,000)	(118,235,000)
Basis Adjustments	(154,445,000)	3,986,000
Fair Value	6,773,712,000	7,382,066,000
Held-to-Maturity
Allowance for securities held-to-maturity	(150,000)
Total held-to-maturity securities	3,089,147,000	0
Unrealized Gains	221,000
Unrealized Losses	(445,686,000)
Basis adjustments	0
Investment securities-held-to-maturity, fair value	2,643,682,000	0
U.S. Treasury
Available-for-Sale
Amortized Cost	253,148,000	234,555,000
Unrealized Gains	5,000	1,233,000
Unrealized Losses	(5,189,000)	(7,751,000)
Basis Adjustments	(47,037,000)	7,547,000
Fair Value	200,927,000	235,584,000
U.S. government-sponsored entities and agencies
Available-for-Sale
Amortized Cost	1,451,736,000	1,575,994,000
Unrealized Gains	0	7,354,000
Unrealized Losses	(169,248,000)	(37,014,000)
Basis Adjustments	(107,408,000)	(3,561,000)
Fair Value	1,175,080,000	1,542,773,000
Held-to-Maturity
Amortized Cost	819,168,000
Unrealized Gains	0
Unrealized Losses	(162,810,000)
Basis adjustments	0
Investment securities-held-to-maturity, fair value	656,358,000
Mortgage-backed securities
Available-for-Sale
Amortized Cost	4,986,354,000	3,737,484,000
Unrealized Gains	976,000	27,421,000
Unrealized Losses	(617,428,000)	(66,074,000)
Basis Adjustments	0	0
Fair Value	4,369,902,000	3,698,831,000
Held-to-Maturity
Amortized Cost	1,106,817,000
Unrealized Gains	0
Unrealized Losses	(123,854,000)
Basis adjustments	0
Investment securities-held-to-maturity, fair value	982,963,000
States and political subdivisions
Available-for-Sale
Amortized Cost	688,159,000	1,587,172,000
Unrealized Gains	1,789,000	69,696,000
Unrealized Losses	(26,096,000)	(1,882,000)
Basis Adjustments	0	0
Fair Value	663,852,000	1,654,986,000
Held-to-Maturity
Amortized Cost	1,163,312,000
Unrealized Gains	221,000
Unrealized Losses	(159,022,000)
Basis adjustments	0
Investment securities-held-to-maturity, fair value	1,004,511,000
Pooled trust preferred securities
Available-for-Sale
Amortized Cost	13,783,000	13,756,000
Unrealized Gains	0	0
Unrealized Losses	(2,972,000)	(4,260,000)
Basis Adjustments	0	0
Fair Value	10,811,000	9,496,000
Other securities
Available-for-Sale
Amortized Cost	379,423,000	235,072,000
Unrealized Gains	258,000	6,578,000
Unrealized Losses	(26,541,000)	(1,254,000)
Basis Adjustments	0	0
Fair Value	$ 353,140,000	$ 240,396,000

Investment Securities - Schedul

Investment Securities - Schedule of 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, 2022	Dec. 31, 2021	Dec. 31, 2020
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Proceeds from sales of available-for-sale debt securities	$ 20,032	$ 198,886	$ 299,885
Proceeds from calls of available-for-sale debt securities	70,808	158,818	465,179
Total	90,840	357,704	765,064
Realized gains on sales of available-for-sale debt securities	344	4,188	11,172
Realized gains on calls of available-for-sale debt securities	187	317	121
Realized losses on sales of available-for-sale debt securities	(377)	(145)	(500)
Realized losses on calls of available-for-sale debt securities	(242)	(33)	(26)
Debt securities gains (losses), net	$ (88)	$ 4,327	$ 10,767

Investment Securities - Expecte

Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale, Amortized Cost
Within one year	$ 108,432,000
One to five years	1,821,584,000
Five to ten years	4,289,711,000
Beyond ten years	1,552,876,000
Amortized Cost	7,772,603,000	$ 7,384,033,000
Available-for-sale, Fair Value
Within one year	106,803,000
One to five years	1,697,506,000
Five to ten years	3,722,857,000
Beyond ten years	1,246,546,000
Total	$ 6,773,712,000	7,382,066,000
Available-for-sale, Weighted Average Yield
Within one year	2.67%
One to five years	2.83%
Five to ten years	2.32%
Beyond ten years	2.52%
Total	2.48%
Held-to-Maturity, Amortized Cost
One to five years	$ 71,144,000
Five to ten years	1,211,517,000
Beyond ten years	1,806,486,000
Total held-to-maturity securities	3,089,147,000	0
Held-to-Maturity, Fair Value
One to five years	65,481,000
Five to ten years	1,079,532,000
Beyond ten years	1,498,669,000
Total	$ 2,643,682,000	$ 0
Held-to-Maturity, Weighted Average Yield
One to five years	3.56%
Five to ten years	2.73%
Beyond ten years	2.83%
Total	2.81%

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, 2022	Dec. 31, 2021
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 4,465,728	$ 3,775,098
Available-for-Sale, Less than 12 Months, Unrealized Losses	(480,166)	(90,987)
Available-for-Sale, 12 months or longer, Fair Value	1,992,246	509,992
Available-for-Sale, 12 months or longer, Unrealized Losses	(367,308)	(27,248)
Available-for-Sale, Fair Value	6,457,974	4,285,090
Available-for-Sale, Unrealized Losses	(847,474)	(118,235)
U.S. Treasury
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	130,967	91,063
Available-for-Sale, Less than 12 Months, Unrealized Losses	(3,264)	(7,751)
Available-for-Sale, 12 months or longer, Fair Value	66,992	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(1,925)	0
Available-for-Sale, Fair Value	197,959	91,063
Available-for-Sale, Unrealized Losses	(5,189)	(7,751)
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	454,854	1,032,566
Available-for-Sale, Less than 12 Months, Unrealized Losses	(75,795)	(21,167)
Available-for-Sale, 12 months or longer, Fair Value	720,226	312,949
Available-for-Sale, 12 months or longer, Unrealized Losses	(93,453)	(15,847)
Available-for-Sale, Fair Value	1,175,080	1,345,515
Available-for-Sale, Unrealized Losses	(169,248)	(37,014)
Mortgage-backed securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	3,207,319	2,415,923
Available-for-Sale, Less than 12 Months, Unrealized Losses	(358,507)	(59,277)
Available-for-Sale, 12 months or longer, Fair Value	1,116,205	163,685
Available-for-Sale, 12 months or longer, Unrealized Losses	(258,921)	(6,797)
Available-for-Sale, Fair Value	4,323,524	2,579,608
Available-for-Sale, Unrealized Losses	(617,428)	(66,074)
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	414,813	178,570
Available-for-Sale, Less than 12 Months, Unrealized Losses	(25,555)	(1,849)
Available-for-Sale, 12 months or longer, Fair Value	2,703	2,729
Available-for-Sale, 12 months or longer, Unrealized Losses	(541)	(33)
Available-for-Sale, Fair Value	417,516	181,299
Available-for-Sale, Unrealized Losses	(26,096)	(1,882)
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	10,811	9,496
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,972)	(4,260)
Available-for-Sale, Fair Value	10,811	9,496
Available-for-Sale, Unrealized Losses	(2,972)	(4,260)
Other securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	257,775	56,976
Available-for-Sale, Less than 12 Months, Unrealized Losses	(17,045)	(943)
Available-for-Sale, 12 months or longer, Fair Value	75,309	21,133
Available-for-Sale, 12 months or longer, Unrealized Losses	(9,496)	(311)
Available-for-Sale, Fair Value	333,084	78,109
Available-for-Sale, Unrealized Losses	$ (26,541)	$ (1,254)

Investment Securities - Held-to

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

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment portfolio	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of loan portfolios | portfolio	4
Number of loan segments | segment	7
Accrued interest receivable on loans	$ 137,700,000	$ 47,600,000
Allowance for credit losses	$ 303,671,000	107,341,000	$ 131,388,000	$ 54,619,000
Loan placed on nonaccrual when past due, number of days	90 days
Loan participations	$ 2,300,000,000
Loan participations sold	1,100,000,000
Loan participations retained	$ 1,200,000,000
TDR term	6 months
Minimum number of days for loan charge off to be recorded	120 days
Maximum number of days for loan charge off to be recorded	180 days
Financing receivable TDR's included with non-accrual loans	$ 24,000,000	11,700,000
Financing receivable troubled debt restructurings specific reserves	4,500,000	700,000
Unfunded commitments on TDRs	0	0
Charge-offs	$ (9,000)	(36,000)	(5,450,000)
Number of days for a loan to be considered to be in payment default	90 days
First Midwest
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses	$ 89,100,000
Allowance for credit losses	96,300,000
Troubled Debt Restructurings During Period
Financing Receivable, Allowance for Credit Losses [Line Items]
Decrease in allowance for credit losses	3,800,000	(900,000)
Charge-offs	$ 0	$ 0	0
Increase in allowance for credit losses			300,000
Maximum
Financing Receivable, Allowance for Credit Losses [Line Items]
Aggregate amount of loans to related parties	5%	5%
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of risk-based capital	227%
Regulatory guideline limit	300%
Allowance for credit losses	$ 138,244,000	$ 64,004,000	75,810,000	$ 20,535,000
Charge-offs	$ (4,000)	$ (24,000)	$ (4,801,000)

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	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 31,123,641	$ 13,601,846
Allowance for credit losses on loans	(303,671)	(107,341)	$ (131,388)	$ (54,619)
Net loans	30,819,970	13,494,505
Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	31,123,641	13,601,846
Allowance for credit losses on loans	(303,671)	(107,341)
Net loans	30,819,970	13,494,505
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	9,508,904	3,391,769
Allowance for credit losses on loans	(120,612)	(27,232)	(30,567)	(21,359)
Commercial | PPP Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	32,500	169,000
Commercial | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	(210,280)	(191,557)
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	9,298,624	3,200,212
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	12,457,070	6,380,674
Allowance for credit losses on loans	(138,244)	(64,004)	(75,810)	(20,535)
Commercial real estate | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	(158,322)	(159,190)
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	12,298,748	6,221,484
BBCC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses on loans	(2,431)	(2,458)	(6,120)	(2,279)
BBCC | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	368,602	350,747
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	368,602	350,747
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,460,441	2,255,289
Allowance for credit losses on loans	(21,916)	(9,347)	(12,608)	(2,299)
Residential real estate | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	0
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	6,460,441	2,255,289
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	2,697,226	1,574,114
Consumer | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	(2,697,226)	(1,574,114)
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,034,257	873,139
Allowance for credit losses on loans	(1,532)	(1,743)	(3,580)	(5,319)
Indirect | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,034,257	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,034,257	873,139
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	629,186	140,385
Allowance for credit losses on loans	(12,116)	(528)	(855)	(1,863)
Direct | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	629,186	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	629,186	140,385
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,033,783	560,590
Allowance for credit losses on loans	(6,820)	(2,029)	$ (1,848)	$ (965)
Home equity | Portfolio Segment Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,033,783	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,033,783	560,590
Direct Finance Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 188,100	$ 25,100

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 107,341	$ 131,388	$ 54,619
Charge-offs	(27,281)	(4,310)	(15,553)
Recoveries	11,182	9,075	12,580
Provision for Loan Losses	123,340	(28,812)	38,395
Balance at End of Period	303,671	107,341	131,388
Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	89,089	0	0
Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	41,347
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	27,232	30,567	21,359
Charge-offs	(6,885)	(1,228)	(5,593)
Recoveries	4,610	791	3,629
Provision for Loan Losses	56,875	(2,898)	4,022
Balance at End of Period	120,612	27,232	30,567
Commercial | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	38,780	0	0
Commercial | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	7,150
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	64,004	75,810	20,535
Charge-offs	(6,519)	(264)	(4,323)
Recoveries	1,095	4,403	4,515
Provision for Loan Losses	30,245	(15,945)	29,535
Balance at End of Period	138,244	64,004	75,810
Commercial real estate | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	49,419	0	0
Commercial real estate | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	25,548
BBCC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,458	6,120	2,279
Charge-offs	(85)	(144)	(95)
Recoveries	281	105	140
Provision for Loan Losses	(223)	(3,623)	94
Balance at End of Period	2,431	2,458	6,120
BBCC | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	0
BBCC | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	3,702
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	9,347	12,608	2,299
Charge-offs	(344)	(346)	(824)
Recoveries	760	339	633
Provision for Loan Losses	12,017	(3,254)	3,514
Balance at End of Period	21,916	9,347	12,608
Residential real estate | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	136	0	0
Residential real estate | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	6,986
Indirect
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	1,743	3,580	5,319
Charge-offs	(2,525)	(1,087)	(2,754)
Recoveries	1,263	1,682	1,922
Provision for Loan Losses	1,051	(2,432)	762
Balance at End of Period	1,532	1,743	3,580
Indirect | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	0
Indirect | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	(1,669)
Direct
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	528	855	1,863
Charge-offs	(10,799)	(1,159)	(1,763)
Recoveries	2,557	777	819
Provision for Loan Losses	19,799	55	995
Balance at End of Period	12,116	528	855
Direct | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	31	0	0
Direct | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	0	0	(1,059)
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,029	1,848	965
Charge-offs	(124)	(82)	(201)
Recoveries	616	978	922
Provision for Loan Losses	3,576	(715)	(527)
Balance at End of Period	6,820	2,029	1,848
Home equity | Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	723	0	0
Home equity | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance established for acquired PCD loans and Impact of adopting ASC 326	$ 0	$ 0	$ 689

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 10,879	$ 11,689	$ 2,656
Provision for unfunded loan commitments	10,296	(810)	4,484
Balance at end of period	32,188	10,879	11,689
Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses on unfunded loan commitments acquired during the period	11,013	0	0
Impact of adopting ASC 326
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses on unfunded loan commitments acquired during the period	$ 0	$ 0	$ 4,549

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Risk Category Of Loans [Line Items]
Total loans	$ 31,123,641	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Total loans	31,123,641	13,601,846
Commercial
Risk Category Of Loans [Line Items]
Total loans	9,508,904	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	2,473,145	944,296
Originated one year before current year	1,851,604	589,907
Originated two years before current year	880,723	289,294
Originated three years before current year	802,628	112,326
Originated four years before current year	382,993	171,251
Originated more than five years before current fiscal year	423,484	244,517
Revolving	2,118,835	689,957
Revolving to Term	365,212	158,664
Total loans	9,298,624	3,200,212
Commercial real estate
Risk Category Of Loans [Line Items]
Total loans	12,457,070	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	3,193,582	1,596,481
Originated one year before current year	2,928,035	1,514,176
Originated two years before current year	2,050,913	898,738
Originated three years before current year	1,384,735	492,535
Originated four years before current year	823,735	516,592
Originated more than five years before current fiscal year	1,139,730	666,606
Revolving	57,818	45,215
Revolving to Term	720,200	491,141
Total loans	12,298,748	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	92,738	83,314
Originated one year before current year	64,973	71,056
Originated two years before current year	53,229	55,784
Originated three years before current year	38,138	36,019
Originated four years before current year	24,464	25,366
Originated more than five years before current fiscal year	11,690	9,133
Revolving	61,565	48,344
Revolving to Term	21,805	21,731
Total loans	368,602	350,747
Residential real estate
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,327,227	625,678
Originated one year before current year	1,946,321	632,870
Originated two years before current year	1,826,623	272,766
Originated three years before current year	479,402	73,116
Originated four years before current year	138,086	104,721
Originated more than five years before current fiscal year	742,687	546,021
Revolving	7	12
Revolving to Term	88	105
Total loans	6,460,441	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Total loans	6,460,441	2,255,289
Residential real estate | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,327,168	625,582
Originated one year before current year	1,945,792	632,705
Originated two years before current year	1,825,762	272,600
Originated three years before current year	478,529	72,766
Originated four years before current year	136,260	103,866
Originated more than five years before current fiscal year	712,175	529,293
Revolving	7	12
Revolving to Term	88	105
Total loans	6,425,781	2,236,929
Residential real estate | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	59	96
Originated one year before current year	529	165
Originated two years before current year	861	166
Originated three years before current year	873	350
Originated four years before current year	1,826	855
Originated more than five years before current fiscal year	30,512	16,728
Revolving	0	0
Revolving to Term	0	0
Total loans	34,660	18,360
Indirect
Risk Category Of Loans [Line Items]
Originated in current fiscal year	504,758	361,747
Originated one year before current year	250,481	231,680
Originated two years before current year	144,910	147,592
Originated three years before current year	82,835	69,023
Originated four years before current year	31,788	42,028
Originated more than five years before current fiscal year	19,423	21,060
Revolving	0	0
Revolving to Term	62	9
Total loans	1,034,257	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Total loans	1,034,257	873,139
Indirect | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	504,410	361,485
Originated one year before current year	249,407	231,156
Originated two years before current year	144,265	146,978
Originated three years before current year	82,304	68,513
Originated four years before current year	31,484	41,598
Originated more than five years before current fiscal year	19,095	20,819
Revolving	0	0
Revolving to Term	62	9
Total loans	1,031,027	870,558
Indirect | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	348	262
Originated one year before current year	1,074	524
Originated two years before current year	645	614
Originated three years before current year	531	510
Originated four years before current year	304	430
Originated more than five years before current fiscal year	328	241
Revolving	0	0
Revolving to Term	0	0
Total loans	3,230	2,581
Direct
Risk Category Of Loans [Line Items]
Originated in current fiscal year	133,049	34,071
Originated one year before current year	164,977	16,188
Originated two years before current year	78,020	14,526
Originated three years before current year	58,124	14,712
Originated four years before current year	45,626	7,467
Originated more than five years before current fiscal year	60,738	16,367
Revolving	87,627	36,854
Revolving to Term	1,025	200
Total loans	629,186	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Total loans	629,186	140,385
Direct | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	132,934	34,058
Originated one year before current year	164,126	16,135
Originated two years before current year	77,406	14,396
Originated three years before current year	57,919	14,579
Originated four years before current year	45,299	7,432
Originated more than five years before current fiscal year	59,212	15,831
Revolving	87,622	36,812
Revolving to Term	671	192
Total loans	625,189	139,435
Direct | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	115	13
Originated one year before current year	851	53
Originated two years before current year	614	130
Originated three years before current year	205	133
Originated four years before current year	327	35
Originated more than five years before current fiscal year	1,526	536
Revolving	5	42
Revolving to Term	354	8
Total loans	3,997	950
Home equity
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,085	0
Originated one year before current year	1,056	0
Originated two years before current year	2,015	649
Originated three years before current year	1,943	358
Originated four years before current year	1,777	576
Originated more than five years before current fiscal year	15,954	1
Revolving	991,699	539,315
Revolving to Term	18,254	19,691
Total loans	1,033,783	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Total loans	1,033,783	560,590
Home equity | Performing
Risk Category Of Loans [Line Items]
Originated in current fiscal year	919	0
Originated one year before current year	896	0
Originated two years before current year	1,849	633
Originated three years before current year	1,497	349
Originated four years before current year	983	535
Originated more than five years before current fiscal year	11,646	0
Revolving	990,001	539,057
Revolving to Term	14,792	16,768
Total loans	1,022,583	557,342
Home equity | Nonperforming
Risk Category Of Loans [Line Items]
Originated in current fiscal year	166	0
Originated one year before current year	160	0
Originated two years before current year	166	16
Originated three years before current year	446	9
Originated four years before current year	794	41
Originated more than five years before current fiscal year	4,308	1
Revolving	1,698	258
Revolving to Term	3,462	2,923
Total loans	11,200	3,248
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	2,388,618	918,456
Originated one year before current year	1,754,364	563,869
Originated two years before current year	796,340	271,158
Originated three years before current year	738,208	98,468
Originated four years before current year	362,986	156,136
Originated more than five years before current fiscal year	388,617	235,639
Revolving	1,988,763	667,628
Revolving to Term	329,119	130,470
Total loans	8,747,015	3,041,824
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	3,066,960	1,555,880
Originated one year before current year	2,828,758	1,474,271
Originated two years before current year	1,989,000	846,921
Originated three years before current year	1,219,025	481,508
Originated four years before current year	675,572	462,176
Originated more than five years before current fiscal year	1,018,719	611,680
Revolving	57,818	42,609
Revolving to Term	689,553	451,544
Total loans	11,545,405	5,926,589
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	90,341	81,710
Originated one year before current year	64,161	69,749
Originated two years before current year	52,304	54,580
Originated three years before current year	36,868	34,461
Originated four years before current year	23,618	25,113
Originated more than five years before current fiscal year	11,333	8,296
Revolving	60,016	47,571
Revolving to Term	18,881	18,778
Total loans	357,522	340,258
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	40,856	9,998
Originated one year before current year	30,661	7,885
Originated two years before current year	63,557	6,660
Originated three years before current year	33,490	0
Originated four years before current year	9,195	7,809
Originated more than five years before current fiscal year	5,312	2,658
Revolving	61,036	14,601
Revolving to Term	4,327	10,076
Total loans	248,434	59,687
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	75,306	27,622
Originated one year before current year	34,422	24,790
Originated two years before current year	22,569	39,914
Originated three years before current year	82,637	0
Originated four years before current year	86,504	21,614
Originated more than five years before current fiscal year	56,864	22,157
Revolving	0	0
Revolving to Term	23,282	34,387
Total loans	381,584	170,484
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,504	1,320
Originated one year before current year	525	1,170
Originated two years before current year	368	841
Originated three years before current year	692	160
Originated four years before current year	353	0
Originated more than five years before current fiscal year	0	0
Revolving	1,006	670
Revolving to Term	1,603	1,578
Total loans	6,051	5,739
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	37,223	14,773
Originated one year before current year	47,522	14,468
Originated two years before current year	16,540	10,200
Originated three years before current year	22,925	9,849
Originated four years before current year	4,844	5,521
Originated more than five years before current fiscal year	21,204	945
Revolving	67,402	6,883
Revolving to Term	25,143	10,322
Total loans	242,803	72,961
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	46,231	4,706
Originated one year before current year	16,928	12,118
Originated two years before current year	24,319	9,933
Originated three years before current year	78,468	9,058
Originated four years before current year	57,824	18,165
Originated more than five years before current fiscal year	21,591	11,351
Revolving	0	2,291
Revolving to Term	4,108	4,339
Total loans	249,469	71,961
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	811	284
Originated one year before current year	143	24
Originated two years before current year	0	79
Originated three years before current year	421	7
Originated four years before current year	0	187
Originated more than five years before current fiscal year	0	465
Revolving	543	103
Revolving to Term	682	239
Total loans	2,600	1,388
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	3,627	1,069
Originated one year before current year	1,453	3,507
Originated two years before current year	566	1,276
Originated three years before current year	0	3,721
Originated four years before current year	0	1,448
Originated more than five years before current fiscal year	0	0
Revolving	1,634	845
Revolving to Term	6,623	7,796
Total loans	13,903	19,662
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	3,151	1,620
Originated one year before current year	9,541	2,997
Originated two years before current year	5,014	0
Originated three years before current year	0	1,627
Originated four years before current year	2,312	3,419
Originated more than five years before current fiscal year	22,155	8,905
Revolving	0	315
Revolving to Term	3,257	871
Total loans	45,430	19,754
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	42	0
Originated one year before current year	37	88
Originated two years before current year	118	0
Originated three years before current year	0	0
Originated four years before current year	429	66
Originated more than five years before current fiscal year	284	162
Revolving	0	0
Revolving to Term	639	1,136
Total loans	1,549	1,452
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	2,821	0
Originated one year before current year	17,604	178
Originated two years before current year	3,720	0
Originated three years before current year	8,005	288
Originated four years before current year	5,968	337
Originated more than five years before current fiscal year	8,351	5,275
Revolving	0	0
Revolving to Term	0	0
Total loans	46,469	6,078
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	1,934	6,653
Originated one year before current year	38,386	0
Originated two years before current year	10,011	1,970
Originated three years before current year	4,605	342
Originated four years before current year	1,523	11,218
Originated more than five years before current fiscal year	20,401	12,513
Revolving	0	0
Revolving to Term	0	0
Total loans	76,860	32,696
Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Risk Category Of Loans [Line Items]
Originated in current fiscal year	40	0
Originated one year before current year	107	25
Originated two years before current year	439	284
Originated three years before current year	157	1,391
Originated four years before current year	64	0
Originated more than five years before current fiscal year	73	210
Revolving	0	0
Revolving to Term	0	0
Total loans	$ 880	$ 1,910

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 31,123,641	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	31,123,641	13,601,846
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,508,904	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,298,624	3,200,212
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,457,070	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,298,748	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	368,602	350,747
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,460,441	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,460,441	2,255,289
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,034,257	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,034,257	873,139
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	629,186	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	629,186	140,385
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,033,783	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,033,783	560,590
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	186,223	37,862
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	30,028	4,943
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	81,444	8,724
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,698	1,018
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	40,967	15,191
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,378	5,309
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,450	1,008
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,258	1,669
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	104,589	18,413
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	14,147	2,723
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	47,240	1,402
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	730	747
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	24,181	8,273
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,302	3,888
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,404	687
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,585	693
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	17,713	4,648
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,801	617
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,312	280
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	365	162
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,033	2,364
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,118	867
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,118	159
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,966	199
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	63,921	14,801
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	11,080	1,603
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	32,892	7,042
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	603	109
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	11,753	4,554
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	958	554
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,928	162
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,707	777
Current | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	30,937,418	13,563,984
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,268,596	3,195,269
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,217,304	6,212,760
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	366,904	349,729
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,419,474	2,240,098
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,024,879	867,830
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	619,736	139,377
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 1,020,525	$ 558,921

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	$ 238,178	$ 106,691
Nonaccrual With No Related Allowance	41,318	34,713
Past Due 90 Days or More and Accruing	2,650	7
Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	60,372	25,740
Nonaccrual With No Related Allowance	7,873	9,574
Past Due 90 Days or More and Accruing	152	0
Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	122,290	52,450
Nonaccrual With No Related Allowance	33,445	25,139
Past Due 90 Days or More and Accruing	0	0
BBCC
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	2,429	3,362
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	0	0
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	34,660	18,360
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	1,808	0
Indirect
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	3,230	2,581
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	28	4
Direct
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	3,997	950
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	133	3
Home equity
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Amortized Cost	11,200	3,248
Nonaccrual With No Related Allowance	0	0
Past Due 90 Days or More and Accruing	$ 529	$ 0

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Schedule of Types of Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	$ 31,123,641	$ 13,601,846
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	168,623	70,984
Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	43,245	15,147
Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	4,408	4,399
Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	5,085	2,906
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	7,414	6,975
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	9,508,904	3,391,769
Commercial | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	8,962	8,100
Commercial | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	42,754	13,816
Commercial | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	2,690	3,394
Commercial | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,611	80
Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	980	302
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	12,457,070	6,380,674
Commercial real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	108,871	38,657
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	1,718	961
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	6,411	6,653
BBCC | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,939	1,895
BBCC | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	478	1,331
BBCC | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	43
BBCC | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	12	93
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	6,460,441	2,255,289
Residential real estate | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	34,660	18,360
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	1,034,257	873,139
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	3,230	2,581
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	629,186	140,385
Direct | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	2,991	724
Direct | Blanket Lien
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	13	0
Direct | Investment Securities/Cash
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	0	1
Direct | Auto
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	232	152
Direct | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	23	20
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	1,033,783	560,590
Home equity | Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans, net of unearned income	11,200	3,248
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 Activity in Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	$ 30,039	$ 32,653	$ 31,738
(Charge-offs)/ Recoveries	9	36	5,450
(Payments)/ Disbursements	(18,116)	(7,309)	(14,167)
Additions	27,370	4,659	9,632
Balance at end of period	39,302	30,039	32,653
Commercial
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	7,456	11,090	12,412
(Charge-offs)/ Recoveries	0	0	633
(Payments)/ Disbursements	(6,880)	(4,535)	(4,557)
Additions	5,194	901	2,602
Balance at end of period	5,770	7,456	11,090
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	17,158	17,606	14,277
(Charge-offs)/ Recoveries	4	24	4,801
(Payments)/ Disbursements	(10,908)	(2,166)	(8,502)
Additions	21,982	1,694	7,030
Balance at end of period	28,236	17,158	17,606
BBCC
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	87	112	578
(Charge-offs)/ Recoveries	3	8	(19)
(Payments)/ Disbursements	(16)	(33)	(447)
Additions	0	0	0
Balance at end of period	74	87	112
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	2,435	2,824	3,107
(Charge-offs)/ Recoveries	0	(4)	0
(Payments)/ Disbursements	(169)	(385)	(283)
Additions	0	0	0
Balance at end of period	2,266	2,435	2,824
Indirect
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	0	0	0
(Charge-offs)/ Recoveries	1	3	9
(Payments)/ Disbursements	(1)	(3)	(9)
Additions	0	0	0
Balance at end of period	0	0	0
Direct
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	2,704	739	983
(Charge-offs)/ Recoveries	0	2	23
(Payments)/ Disbursements	(58)	(101)	(267)
Additions	194	2,064	0
Balance at end of period	2,840	2,704	739
Home equity
Financing Receivable, Troubled Debt Restructuring [Roll Forward]
Balance at beginning of period	199	282	381
(Charge-offs)/ Recoveries	1	3	3
(Payments)/ Disbursements	(84)	(86)	(102)
Additions	0	0	0
Balance at end of period	$ 116	$ 199	$ 282

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Schedule of Loans by Class Modified as Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Receivables [Abstract]
Number of loans | loan	8	3	4
Pre-modification outstanding recorded investment	$ 27,370	$ 4,659	$ 9,632
Post-modification outstanding recorded investment	$ 27,370	$ 4,659	$ 9,632

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 15, 2022	Dec. 31, 2022
Receivables [Abstract]
Purchase price of loans at acquisition	$ 1,400,000	$ 1,390,273
Allowance for credit losses at acquisition	89,100	89,089
Non-credit discount/(premium) at acquisition		9,003
Par value of acquired loans at acquisition	$ 1,500,000	$ 1,488,365

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total	$ 735,295	$ 629,868
Accumulated depreciation	(177,988)	(153,682)
Premises and equipment, net	557,307	476,186
Land
Property, Plant and Equipment [Line Items]
Total	91,568	71,014
Buildings
Property, Plant and Equipment [Line Items]
Total	419,596	394,400
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Total	154,719	118,124
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	$ 69,412	$ 46,330

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 15, 2022
Property, Plant and Equipment [Abstract]
Depreciation	$ 36,436	$ 27,276	$ 28,911
First Midwest
Business Acquisition [Line Items]
Premises and equipment	$ 111,900			$ 111,867

Leases - Additional Information

Leases - Additional Information (Details)	Dec. 31, 2022
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost:
Total	$ 32,007	$ 14,685	$ 24,444
Occupancy/Equipment expense
Lessee, Lease, Description [Line Items]
Operating lease cost	29,368	12,336	23,548
Occupancy expense
Finance lease cost:
Amortization of right-of-use assets	2,672	2,356	1,044
Sub-lease income	(448)	(438)	(512)
Interest expense
Finance lease cost:
Interest on lease liabilities	$ 415	$ 431	$ 364

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Operating Leases
Operating lease right-of-use assets	$ 189,714	$ 69,560
Operating lease liabilities	211,964	76,236
Finance Leases
Premises and equipment, net	10,799	16,451
Other borrowings	$ 13,469	$ 17,233
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	9 years 1 month 6 days	10 years 4 months 24 days
Finance leases	7 years 2 months 12 days	7 years 7 months 6 days
Weighted-Average Discount Rate
Operating leases	2.88%	3.34%
Finance leases	3.30%	3.02%

Leases - Schedule of Suppleme_2

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 30,340	$ 13,823	$ 15,906
Operating cash flows from finance leases	415	431	364
Financing cash flows from finance leases	$ 2,475	$ 2,057	$ 819

Leases - Schedule of Maturity A

Leases - Schedule of Maturity Analysis of Lease Liability by Lease Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Operating Leases
2023	$ 30,951
2024	29,939
2025	28,635
2026	27,639
2027	26,604
Thereafter	98,539
Total undiscounted lease payments	242,307
Amounts representing interest	(30,343)
Lease liability	211,964	$ 76,236
Finance Leases
2023	2,600
2024	2,643
2025	2,645
2026	1,400
2027	1,381
Thereafter	4,525
Total undiscounted lease payments	15,194
Amounts representing interest	(1,725)
Lease liability	$ 13,469	$ 17,233

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,036,994	$ 1,036,994	$ 1,036,994
Acquisitions and adjustments	961,722	0	0
Balance at end of period	$ 1,998,716	$ 1,036,994	$ 1,036,994

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)			12 Months Ended
	Aug. 31, 2022	Feb. 15, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Acquisitions and adjustments			$ 961,722,000	$ 0	$ 0
Goodwill impairment	$ 0
Impairment charges			0	0	0
Amortization of other intangible assets			$ 25,857,000	$ 11,336,000	$ 14,091,000
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
First Midwest | Core deposit
Goodwill [Line Items]
Estimated useful lives		10 years
First Midwest | Customer trust relationships
Goodwill [Line Items]
Estimated useful lives		13 years

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, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 226,885	$ 109,301
Accumulated Amortization and Impairment	(100,480)	(74,623)
Net Carrying Amount	126,405	34,678
Core deposit
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	170,642	92,754
Accumulated Amortization and Impairment	(80,951)	(60,036)
Net Carrying Amount	89,691	32,718
Customer trust relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	56,243	16,547
Accumulated Amortization and Impairment	(19,529)	(14,587)
Net Carrying Amount	$ 36,714	$ 1,960

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2023	$ 24,214
2024	21,298
2025	18,417
2026	15,614
2027	12,926
Thereafter	33,936
Net Carrying Amount	$ 126,405	$ 34,678

Loan Servicing Rights - Additio

Loan Servicing Rights - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Transfers and Servicing [Abstract]
Loan servicing rights	$ 37,267	$ 30,039	$ 26,717
Principal balance of loans serviced for others	4,300,000	3,700,000
Funds held in escrow	27,000	18,200
Fair value of servicing rights	$ 48,400	$ 33,800
Fair value at discount rate	9%	9%
Fair value inputs weighted average prepayment speed	9%	10%

Loan Servicing Rights - Compone

Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]
Additions	$ 13,080,000	$ 11,759,000	$ 12,810,000
Servicing asset:
Balance at beginning of period	30,085,000	28,124,000	25,399,000
Additions	13,080,000	11,759,000	12,810,000
Amortization	(5,898,000)	(9,798,000)	(10,085,000)
Balance before valuation allowance at end of period	37,267,000	30,085,000	28,124,000
Valuation allowance:
Balance at beginning of period	(46,000)	(1,407,000)	(31,000)
(Additions)/recoveries	46,000	1,361,000	(1,376,000)
Balance at end of period	0	(46,000)	(1,407,000)
Loan servicing rights, net	37,267,000	$ 30,039,000	$ 26,717,000
First Midwest
Servicing Assets at Fair Value [Line Items]
Additions	7,700,000
Servicing asset:
Additions	$ 7,700,000

Qualified Affordable Housing _3

Qualified Affordable Housing Projects and Other Tax Credit Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Investment	$ 156,755	$ 110,942
Unfunded Commitment	65,342	56,607
Amortization Expense	15,935	10,220	$ 21,893
Tax Expense (Benefit) Recognized	(19,065)	(11,614)	(24,875)
LIHTC
Investment Holdings [Line Items]
Investment, Proportional amortization	84,428	68,989
Unfunded commitment, Proportional amortization	55,754	41,355
Amortization Expense	4,974	3,450	3,105
Tax Expense (Benefit) Recognized	(6,613)	(4,543)	(4,071)
FHTC
Investment Holdings [Line Items]
Investment, Equity	19,316	21,241
Unfunded commitment, Equity	9,588	15,252
Amortization Expense	1,925	2,557	13,237
Tax Expense (Benefit) Recognized	(2,227)	(2,884)	(15,582)
NMTC
Investment Holdings [Line Items]
Investment, Equity	51,912	18,727
Unfunded commitment, Equity	0	0
Amortization Expense	8,197	2,887	900
Tax Expense (Benefit) Recognized	(10,225)	(3,625)	(1,100)
Renewable Energy
Investment Holdings [Line Items]
Investment, Equity	1,099	1,985
Unfunded commitment, Equity	0	0
Amortization Expense	839	1,326	4,651
Tax Expense (Benefit) Recognized	$ 0	$ (562)	$ (4,122)

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Total Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Maturities of Time Deposits [Abstract]
Due in 2023	$ 2,099,157
Due in 2024	684,377
Due in 2025	118,776
Due in 2026	64,207
Due in 2027	41,794
Thereafter	5,469
Total	$ 3,013,780	$ 960,413

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deposits [Abstract]
Time deposits, meet or exceed FDIC insurance limit of $250,000	$ 793.4	$ 252.8

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, 2022	Dec. 31, 2021
Securities Sold under Agreements to Repurchase [Abstract]
Outstanding at year-end	$ 432,804	$ 392,275
Average amount outstanding	440,619	392,777
Maximum amount outstanding at any month-end	$ 509,275	$ 405,278
Weighted-average interest rate during year	0.19%	0.10%
Weighted-average interest rate at end of year	1.31%	0.10%

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, 2022	Dec. 31, 2021
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 432,804	$ 392,275
U.S. Treasury
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	432,804
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	432,804
Overnight and Continuous | U.S. Treasury
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	432,804
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
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
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
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, 2022
Securities Sold under Agreements to Repurchase [Abstract]
Gross outstanding balance of repurchase agreements collateralized by securities percentage	110%

Federal Home Loan Bank Advanc_3

Federal Home Loan Bank Advances - Summary of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank, Advances [Line Items]
FHLB advances (fixed rates 0.00% to 4.96% and    variable rates 3.90% to 4.17%) maturing    January 2023 to September 2042	$ 3,850,677	$ 1,902,655
Fair value hedge basis adjustments and unamortized prepayment fees	(21,659)	(16,636)
Federal Home Loan Bank advances	$ 3,829,018	$ 1,886,019
Minimum | FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Fixed rates	0%
Variable rates	3.90%
Maximum | FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Fixed rates	4.96%
Variable rates	4.17%

Federal Home Loan Bank Advanc_4

Federal Home Loan Bank Advances - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank, Advances [Line Items]
Weighted-average rates of FHLB advances	3.15%	1.30%
Modifications, unamortized prepayment fees	$ 20.2	$ 26.2
FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Percentage of borrowings collateralized by investment securities and residential real estate loans	140%

Federal Home Loan Bank Advanc_5

Federal Home Loan Bank Advances - Summary of Contractual Maturities of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Due in 2023	$ 950,149
Due in 2024	25,243
Due in 2025	550,285
Due in 2026	100,000
Thereafter	2,225,000
Fair value hedge basis adjustments and unamortized prepayment fees	(21,659)	$ (16,636)
Federal Home Loan Bank advances	$ 3,829,018	$ 1,886,019

Other Borrowings - Schedule of

Other Borrowings - Schedule of Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2014
Debt Instrument [Line Items]
Lease liability	$ 13,469	$ 17,233
Other borrowings	743,003	296,670
Old National Bank
Debt Instrument [Line Items]
Other basis adjustments	89,588	2,839
Lease liability	13,469	17,233
Derivative collateralize position amount	88,000
Old National Bancorp
Debt Instrument [Line Items]
Other basis adjustments	23,363	(3,044)
Other borrowings	$ 484,759	213,553
Senior Unsecured Notes | Old National Bancorp
Debt Instrument [Line Items]
Fixed rates	4.125%		4.125%
Senior unsecured notes (fixed rate 4.125%) maturing August 2024	$ 175,000	175,000	$ 175,000
Unamortized debt issuance costs related to senior unsecured notes	$ (247)	(403)
Subordinated Debt
Debt Instrument [Line Items]
Fixed rates	5.875%
Subordinated Debt | Old National Bank
Debt Instrument [Line Items]
Fixed rates	8.77%
Subordinated debentures	$ 12,000	12,000
Subordinated Debt | Old National Bancorp
Debt Instrument [Line Items]
Fixed rates	5.875%
Subordinated debentures	$ 150,000	0
Junior Subordinated Debentures | Old National Bancorp
Debt Instrument [Line Items]
Junior subordinated debentures (variable rates of    5.68% to 7.99%) maturing July 2031 to September 2037	136,643	42,000
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	$ 143,187	$ 51,045
Minimum | Junior Subordinated Debentures | Old National Bancorp
Debt Instrument [Line Items]
Variable rates	5.68%
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	7.99%
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, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Due in 2023	$ 90,276
Due in 2024	177,335
Due in 2025	14,389
Due in 2026	151,188
Due in 2027	1,209
Thereafter	283,934
Unamortized debt issuance costs and other basis adjustments	24,672
Total	$ 743,003	$ 296,670

Other Borrowings - Additional I

Other Borrowings - Additional Information (Details) - USD ($) $ in Thousands	Nov. 01, 2017	Dec. 31, 2022	Feb. 15, 2022	Dec. 31, 2021	Aug. 31, 2014
Debt Instrument [Line Items]
Lease liability		$ 13,469		$ 17,233
Old National Bank
Debt Instrument [Line Items]
Lease liability		13,469		17,233
First Midwest
Debt Instrument [Line Items]
Subordinated debentures			$ 150,000
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-To-Floating Notes
Debt Instrument [Line Items]
Value of subordinated fixed-to-floating notes assumed	$ 12,000
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-To-Floating Notes | LIBOR
Debt Instrument [Line Items]
Fixed rates	5.75%
LIBOR rate	4.356%
Old National Bancorp | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior unsecured notes		$ 175,000		$ 175,000	$ 175,000
Fixed rates		4.125%			4.125%

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, 2022 USD ($)
Debt Instrument [Line Items]
Issuance Amount	$ 136,643,000
Bridgeview Statutory Trust I
Debt Instrument [Line Items]
Issuance Amount	$ 15,464,000
Rate	7.99%
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	7.43%
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	6.49%
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	6.57%
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	6.30%
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	6.17%
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	6.42%
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	5.68%
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	6.45%
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	6.37%
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	6.47%
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, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 3,012,018	$ 2,972,656	$ 2,852,453
Other comprehensive income (loss) before       reclassifications	(798,735)	(143,515)	103,826
Amounts reclassified from AOCI to income	14,688	(6,631)	(12,262)
Ending Balance	5,128,595	3,012,018	2,972,656
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,375)	147,771	56,207
Ending Balance	(786,422)	(2,375)	147,771
Unrealized Gains and Losses on Available- for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,950)	145,335	56,131
Other comprehensive income (loss) before       reclassifications	(639,463)	(144,948)	97,596
Amounts reclassified from AOCI to income	67	(3,337)	(8,392)
Ending Balance	(642,346)	(2,950)	145,335
Unrealized Gains and Losses on Held-to- Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	0	0
Other comprehensive income (loss) before       reclassifications	(125,229)	0	0
Amounts reclassified from AOCI to income	12,565	0	0
Ending Balance	(112,664)	0	0
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	543	2,584	240
Other comprehensive income (loss) before       reclassifications	(34,043)	1,433	6,230
Amounts reclassified from AOCI to income	1,951	(3,474)	(3,886)
Ending Balance	(31,549)	543	2,584
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	32	(148)	(164)
Other comprehensive income (loss) before       reclassifications	0	0	0
Amounts reclassified from AOCI to income	105	180	16
Ending Balance	$ 137	$ 32	$ (148)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Debt securities (gains) losses, net	$ 88	$ (4,327)	$ (10,767)
Income tax expense (benefit)	(116,446)	(61,324)	(29,147)
Interest income (expense)	(1,327,936)	(596,400)	(596,094)
Salaries and employee benefits	575,626	284,098	293,590
Net income	(428,287)	(277,538)	(226,409)
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(14,688)	6,631	12,262
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	(88)	4,327	10,767
Income tax expense (benefit)	21	(990)	(2,375)
Net income	(67)	3,337	8,392
Amount Reclassified from AOCI | Unrealized gains and losses on    held-to-maturity securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	4,047	0	0
Interest income (expense)	(16,612)	0	0
Net income	12,565	0	0
Amount Reclassified from AOCI | Gains and Losses on Cash Flow Hedges | Interest Rate Contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	636	(1,131)	(1,267)
Interest income (expense)	(2,587)	4,605	5,153
Net income	(1,951)	3,474	3,886
Amount Reclassified from AOCI | Defined Benefit Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	34	59	5
Salaries and employee benefits	(139)	(239)	(21)
Net income	$ (105)	$ (180)	$ (16)

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision at statutory rate	$ 114,394	$ 71,161	$ 53,667
Tax-exempt income:
Tax-exempt interest	(14,588)	(11,066)	(10,776)
Section 291/265 interest disallowance	363	114	189
Company-owned life insurance income	(2,891)	(2,138)	(2,290)
Tax-exempt income	(17,116)	(13,090)	(12,877)
State income taxes	20,837	9,308	4,840
Tax credit investments - federal	(9,140)	(5,212)	(15,159)
Officer compensation limitation	5,903	564	598
Other, net	1,568	(1,407)	(1,922)
Income tax expense	$ 116,446	$ 61,324	$ 29,147
Effective tax rate	21.40%	18.10%	11.40%

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current expense:
Federal	$ 106,918	$ 31,943	$ 19,223
State	32,898	8,461	6,498
Deferred expense:
Federal	(16,216)	17,514	3,188
State	(7,154)	3,406	238
Deferred income tax expense	(23,370)	20,920	3,426
Income tax expense	$ 116,446	$ 61,324	$ 29,147

Income Taxes - Schedule of Sign

Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets
Allowance for credit losses on loans, net of recapture	$ 85,619	$ 28,843
Benefit plan accruals	38,038	18,348
Net operating loss carryforwards	25,135	14,823
Acquired loans	40,723	8,039
Operating lease liabilities	58,288	22,961
Unrealized losses on available-for-sale investment securities	202,101	3,003
Unrealized losses on held-to-maturity investment securities	36,197	0
Unrealized losses on hedges	10,277	0
Purchase accounting	20,063	0
Other, net	4,962	3,430
Total deferred tax assets	521,403	99,447
Deferred Tax Liabilities
Deferred loan origination fees	(3,566)	0
Purchase accounting	0	(18,524)
Loan servicing rights	(9,636)	(7,379)
Premises and equipment	(14,844)	(16,972)
Prepaid expenses	(2,774)	(796)
Operating lease right-of-use assets	(51,845)	(21,129)
Unrealized gains on hedges	0	(177)
Other, net	(2,983)	(1,564)
Total deferred tax liabilities	(85,648)	(66,541)
Net deferred tax assets	$ 435,755	$ 32,906

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2023
Income Taxes [Line Items]
Deferred tax assets related to the market value		$ 238,300,000
Net deferred tax assets		435,755,000	$ 32,906,000
Bad debt reserves, created for tax purposes		58,600,000
Valuation allowance recorded		0	0
First Midwest
Income Taxes [Line Items]
Net deferred tax assets		133,900,000
Unrecognized tax benefits that would impact effective tax rate		8,800,000
Decrease in unrecognized tax benefits		3,900,000
Reductions due to statute of limitations expiring	$ 1,100,000	1,139,000	0	$ 0
Reductions for tax positions relating to prior years		2,751,000	0	$ 0
First Midwest | Forecast
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate					$ 7,900,000
Federal
Income Taxes [Line Items]
Operating loss carryforwards		81,500,000	36,700,000
State
Income Taxes [Line Items]
Operating loss carryforwards		$ 124,400,000	$ 116,100,000

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Additions for acquired uncertain tax positions		$ 14,897	$ 0	$ 0
First Midwest
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period		0	0	0
Reductions for tax positions relating to prior years		(2,751)	0	0
Reductions due to statute of limitations expiring	$ (1,100)	(1,139)	0	0
Balance at end of period		$ 11,007	$ 0	$ 0

Share-Based Compensation and _3

Share-Based Compensation and Other Employee Benefit Plans - Additional Information (Details) - USD ($)		12 Months Ended
	May 18, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares authorized for issuance (in shares)	9,000,000
Remaining shares available for issuance (in shares)		9,100,000
Increase in number of shares authorized for issuance (in shares)		$ 28,700,000	$ 7,500,000	$ 7,700,000
Total income tax benefit, stock-based compensation cost		7,100,000	1,800,000	1,900,000
Discretionary profit sharing		$ 0	$ 0	0
Shares allocated to the employee stock ownership plan (in shares)		1,200,000	500,000
Contribution expense under employee stock ownership plan		$ 17,900,000	$ 9,800,000	9,500,000
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		$ 16,100,000
Expected weighted-average period for cost recognition (in years)		1 year 9 months 18 days
Total fair value of shares vested		$ 7,900,000	$ 4,300,000	$ 2,900,000
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]
Unrecognized compensation expense		$ 13,900,000
Expected weighted-average period for cost recognition (in years)		1 year 3 months 18 days
Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period		24 months
Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period		36 months
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term, in years		10 years
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
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period		3 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, vesting period		5 years
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)		19,000	25,000	28,000

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
	Feb. 15, 2022	Dec. 31, 2022
Shares
Nonvested balance at beginning of period (in shares)		554
Granted during the year (in shares)		1,916
Vested during the year (in shares)		(453)
Forfeited during the year (in shares)		(148)
Nonvested balance at end of period (in shares)		1,869
Weighted Average Grant-Date Fair Value
Nonvested balance at beginning of period (in dollars per share)		$ 16.16
Granted during the year (in dollars per share)		18.12
Vested during the year (in dollars per share)		17.29
Forfeited during the year (in dollars per share)		17.88
Nonvested balance at end of period (in dollars per share)		$ 17.76
First Midwest
Weighted Average Grant-Date Fair Value
Share converted (in shares)	900

Share-Based Compensation and _5

Share-Based Compensation and Other Employee Benefit Plans - Summary of Changes in the Nonvested Restricted Stock Units (Details) - Restricted Stock Units - $ / shares shares in Thousands		12 Months Ended
	Feb. 15, 2022	Dec. 31, 2022
Shares
Nonvested balance at beginning of period (in shares)		886
Granted during the year (in shares)		1,935
Vested during the year (in shares)		(720)
Forfeited during the year (in shares)		(73)
Dividend equivalents adjustment (in shares)		53
Nonvested balance at end of period (in shares)		2,081
Weighted Average Grant-Date Fair Value
Nonvested balance at beginning of period (in dollars per share)		$ 14.80
Granted during the year (in dollars per share)		17.66
Vested during the year (in dollars per share)		15.41
Forfeited during the year (in dollars per share)		16.73
Dividend equivalents adjustment (in dollars per share)		16.82
Nonvested balance at end of period (in dollars per share)		$ 17.23
First Midwest
Weighted Average Grant-Date Fair Value
Share converted (in shares)	700

Share-Based Compensation and _6

Share-Based Compensation and Other Employee Benefit Plans - Summary of the Activity in the Stock Option Plan (Details) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Shares
Outstanding at beginning of period (in shares) | shares	28
Exercised (in shares) | shares	(22)
Outstanding at end of period (in shares) | shares	6
Options exercisable at end of year, Shares (in shares) | shares	6
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 4.30
Exercised (in dollars per share) | $ / shares	3.95
Outstanding at end of period (in dollars per share) | $ / shares	5.67
Options exercisable at end of year, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 5.67
Outstanding at end of period, Weighted Average Remaining Contractual Term in Years	2 months 4 days
Options exercisable at end of year, Weighted Average Remaining Contractual Terms in Years	2 months 4 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 71,200
Options exercisable at end of year, Aggregate Intrinsic Value | $	$ 71,200

Share-Based Compensation and _7

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Payment Arrangement [Abstract]
Intrinsic value of options/appreciation rights exercised	$ 331	$ 171	$ 213
Tax benefit realized from options/appreciation rights exercises	$ 132	$ 68	$ 85

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended			13 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 31, 2023	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
Common shares purchase price as percentage of fair market value	95%
Maximum value of shares purchased as percentage of employee compensation	10%
Common stock issued	$ 809	$ 583	$ 577
Common stock repurchased	$ 71,182	$ 3,731	$ 82,358
Share Repurchase Plan
Shareholders' Equity [Line Items]
Number of shares available for repurchase (up to) (in shares)					200,000,000
Share Repurchase Plan | Subsequent Event
Shareholders' Equity [Line Items]
Number of shares repurchased (in shares)				3,500,000
Common stock repurchased				$ 63,800
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)	52,000	35,000
Common stock issued	$ 809	$ 583

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 428,287	$ 277,538	$ 226,409
Preferred dividends	(14,118)	0	0
Net income applicable to common shareholders	$ 414,169	$ 277,538	$ 226,409
Weighted average common shares outstanding:
Weighted average number of common shares outstanding - basic (in shares)	275,179	165,178	165,509
Effect of dilutive securities:
Restricted stock (in shares)	1,502	729	632
Stock options (in shares)	7	22	36
Weighted average shares outstanding (in shares)	276,688	165,929	166,177
Basic Net Income Per Share (in dollars per share)	$ 1.51	$ 1.68	$ 1.37
Diluted Net Income Per Share (in dollars per share)	$ 1.50	$ 1.67	$ 1.36

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, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	$ 52,507	$ 13,211
Fair Value on Recurring Basis | Carrying Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities, at fair value	52,507	13,211
Residential loans held for sale	11,926	35,458
Derivative assets	169,001	74,226
Derivative liabilities	380,704	41,872
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	200,927	235,584
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	1,175,080	1,542,773
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	4,369,902	3,698,831
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	663,852	1,654,986
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	10,811	9,496
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	353,140	240,396
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	52,507	13,211
Residential 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
Residential loans held for sale	11,926	35,458
Derivative assets	169,001	74,226
Derivative liabilities	380,704	41,872
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
Residential 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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	200,927	235,584
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	1,175,080	1,542,773
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	4,369,902	3,698,831
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	663,852	1,654,986
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	10,811	0
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	0	9,496
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	353,140	240,396
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, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	$ 0	$ 0

Fair Value - Reconciliation of

Fair Value - Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pooled trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out of Level 3	$ (11,100)
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	9,496	$ 7,913	$ 8,222
Accretion (amortization) of discount or premium	12	20	15
Increase (decrease) in fair value of securities	1,593	1,590	(260)
Transfers out of Level 3	(11,101)
Sales/payments received		(27)	(64)
Balance at end of period	0	9,496	7,913
Significant Unobservable Inputs (Level 3) | States and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	0	40
Accretion (amortization) of discount or premium	0	0	0
Increase (decrease) in fair value of securities	0	0	0
Transfers out of Level 3	0
Sales/payments received		0	(40)
Balance at end of period	$ 0	$ 0	$ 0

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Provision for credit losses	$ 144,799,000	$ (29,622,000)	$ 42,879,000
Other real estate owned property write-downs	600,000
Valuation allowance for loan servicing rights with impairments	0	46,000	1,407,000	$ 31,000
Recoveries on loan servicing rights	$ 46,000	1,361,000	(1,376,000)
Past due period of mortgage loans held for sale, days	90 days
Interest income for residential loans held for sale	$ 1,800,000	1,500,000	$ 2,000,000
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	92,000,000	21,000,000
Valuation allowance	21,500,000	2,100,000
Provision for credit losses	$ (20,300,000)	$ (100,000)

Fair Value - Quantitative Infor

Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)
Pooled trust preferred securities | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation defaults	0%
Percentage of adjusted specific issuer evaluation recoveries	0%
Pooled trust preferred securities | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation defaults	100%
Percentage of adjusted specific issuer evaluation recoveries	100%
Pooled trust preferred securities | Median
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of adjusted specific issuer evaluation defaults	50%
Percentage of adjusted specific issuer evaluation recoveries	25%
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 9,496
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Minimum | Additional asset defaults
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.057
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Minimum | Expected asset recoveries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Maximum | Additional asset defaults
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.085
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Maximum | Expected asset recoveries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.460
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Weighted Average | Additional asset defaults
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.065
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Weighted Average | Expected asset recoveries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	0.141
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 2,364	$ 22,562
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 16,308	$ 48,026
Significant Unobservable Inputs (Level 3) | 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	0.14	0.10
Significant Unobservable Inputs (Level 3) | 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	0.06	0.01
Significant Unobservable Inputs (Level 3) | 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	0.15	0.47
Significant Unobservable Inputs (Level 3) | 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	0.10	0.26
Significant Unobservable Inputs (Level 3) | 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	0.14	0.28
Significant Unobservable Inputs (Level 3) | 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	0.08	0.11

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, 2022	Dec. 31, 2021
Loan servicing rights | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		$ 140
Loan servicing rights | 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
Loan servicing rights | 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		140
Loan servicing rights | 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		0
Commercial | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 22,562	2,364
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	22,562	2,364
Commercial real estate | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	48,026	16,308
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	$ 48,026	$ 16,308

Fair Value - Schedule of Differ

Fair Value - Schedule of Difference between the Aggregate Fair Value and the Aggregate Remaining Principal Balance (Details) - Residential loans held for sale - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Fair Value	$ 11,926	$ 35,458
Difference	221	1,342
Contractual Principal	$ 11,705	$ 34,116

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Trading Securities and Other Trading Assets [Line Items]
Interest Income	$ 1,327,936	$ 596,400	$ 596,094
Interest (Expense)	(126,266)	(42,249)	$ (67,214)
Residential loans held for sale
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other Gains and (Losses)	(1,127)	(2,139)
Interest Income	10	2
Interest (Expense)	(4)	(6)
Total Changes in Fair Values Included in Current Period Earnings	$ (1,121)	$ (2,143)

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, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market,    and other interest-earning investments	$ 728,412	$ 822,019
Loans, net	30,819,970	13,494,505
Accrued interest receivable	190,521	84,109
Noninterest-bearing demand deposits	11,930,798	6,303,106
Time deposits	3,013,780	960,413
Federal funds purchased and interbank borrowings	581,489	276
Securities sold under agreements to repurchase	432,804	392,275
Federal Home Loan Bank advances	3,829,018	1,886,019
Other borrowings	743,003	296,670
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	728,412	822,019
Accrued interest receivable	190,521	84,109
Noninterest-bearing demand deposits	11,930,798	6,303,106
Checking, NOW, savings, and money market    interest-bearing deposits	20,056,252	11,305,676
Time deposits	3,013,780	960,413
Federal funds purchased and interbank borrowings	581,489	276
Securities sold under agreements to repurchase	432,804	392,275
Federal Home Loan Bank advances	3,829,018	1,886,019
Other borrowings	743,003	296,670
Accrued interest payable	19,547	5,496
Standby letters of credit	755	454
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	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	1,106,817
Carrying Value | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held-to-maturity	1,163,162
Carrying Value | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	9,386,862	3,363,175
Carrying Value | Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	12,317,825	6,315,574
Carrying Value | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	6,438,525	2,245,942
Carrying Value | Consumer credit, net of unearned income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,676,758	1,569,814
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	728,412	822,019
Accrued interest receivable	758	688
Noninterest-bearing demand deposits	11,930,798	6,303,106
Checking, NOW, savings, and money market    interest-bearing deposits	20,056,252	11,305,676
Time deposits	0	0
Federal funds purchased and interbank borrowings	581,489	276
Securities sold under agreements to repurchase	432,804	392,275
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
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
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
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 credit, net of unearned income
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	52,081	35,790
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market    interest-bearing deposits	0	0
Time deposits	2,976,389	968,658
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	3,739,780	1,935,140
Other borrowings	703,156	311,532
Accrued interest payable	19,547	5,496
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	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	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	1,004,361
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 credit, net of unearned income
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	137,682	47,631
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	755	454
Commitments to extend credit	3,666	4,678
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
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
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
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	9,066,583	3,335,009
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	11,867,851	6,211,854
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	5,372,491	2,216,900
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer credit, net of unearned income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 2,557,115	$ 1,582,600

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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	$ 4,500
Interest Expense
Derivative [Line Items]
Hedge gain to be reclassified during next twelve months, net	24,600
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	300,000	377,500
Interest rate collars and floors on loan pools | Cash flow hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	1,900,000	600,000
Interest rate swaps on investment securities | Fair value hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	909,957	909,957
Interest rate lock commitments | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	21,401	90,731
Forward mortgage loan contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	30,330	126,107
Counterparty interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	5,220,363	2,433,177
Customer interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 5,220,363	$ 2,433,177

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Designated as Hedging Instrument
Derivative [Line Items]
Assets	$ 11,764	$ 18,211
Liabilities	47,859	16,912
Designated as Hedging Instrument | Cash flow hedges | Interest rate collars and floors on loan pools
Derivative [Line Items]
Notional	1,900,000	600,000
Assets	11,764	459
Liabilities	47,859	2,173
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps on borrowings
Derivative [Line Items]
Notional	150,000	150,000
Assets	0	4,316
Liabilities	0	0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on borrowings
Derivative [Line Items]
Notional	300,000	377,500
Assets	0	2,475
Liabilities	0	96
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on investment securities
Derivative [Line Items]
Notional	909,957	909,957
Assets	0	10,961
Liabilities	0	14,643
Not Designated as Hedging Instrument
Derivative [Line Items]
Assets	157,237	56,015
Liabilities	332,845	24,960
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Notional	21,401	90,731
Assets	93	2,352
Liabilities	0	0
Not Designated as Hedging Instrument | Forward mortgage loan contracts
Derivative [Line Items]
Notional	30,330	126,107
Assets	32	242
Liabilities	0	0
Not Designated as Hedging Instrument | Customer interest rate swaps
Derivative [Line Items]
Notional	5,220,363	2,433,177
Assets	5,676	52,439
Liabilities	326,924	11,658
Not Designated as Hedging Instrument | Counterparty interest rate swaps
Derivative [Line Items]
Notional	5,220,363	2,433,177
Assets	151,111	583
Liabilities	5,711	12,956
Not Designated as Hedging Instrument | Customer foreign currency forward contracts
Derivative [Line Items]
Notional	8,341	10,292
Assets	253	399
Liabilities	42	0
Not Designated as Hedging Instrument | Counterparty foreign currency forward contracts
Derivative [Line Items]
Notional	8,297	10,205
Assets	72	0
Liabilities	$ 168	$ 346

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income on Derivative	$ (45,132)	$ 1,898	$ 8,261
Gain (Loss) Reclassified from AOCI into Income	(2,587)	4,605	5,153
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(1,487)	(4,271)	5,154
Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	151,496	(11,069)	8,211
Gain (Loss) Recognized in Income on Related Hedged Items	(151,846)	11,250	(8,250)
Interest rate swaps on borrowings | Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(6,245)	(6,413)	7,238
Gain (Loss) Recognized in Income on Related Hedged Items	6,585	6,296	(7,283)
Interest rate swaps on investment securities | Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	157,741	(4,656)	973
Gain (Loss) Recognized in Income on Related Hedged Items	(158,431)	4,954	(967)
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income on Derivative	(45,132)	1,898	8,261
Gain (Loss) Reclassified from AOCI into Income	(2,587)	4,605	5,153
Interest Rate Contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	883	279	(551)
Mortgage contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	(2,468)	(4,446)	5,692
Foreign currency contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 98	$ (104)	$ 13

Commitments, Contingencies, a_3

Commitments, Contingencies, and Financial Guarantees - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Term of standby letters of credit, years	1 year
Percent of unfunded loan commitments with fixed rates	5%
Loan commitments floating rate, minimum	0%
Loan commitments floating rate, maximum	21%
Allowance for unfunded loan commitments	$ 32,200,000	$ 10,900,000
Interest Rate Swap
Loss Contingencies [Line Items]
Notional	$ 398,900,000	$ 97,700,000
Class B Restricted Shares | Visa
Loss Contingencies [Line Items]
Restricted stock conversion ratio	1.5991
Investment owned, balance, shares (in shares) | shares	65,466
Investment owned, at cost	$ 0

Commitments, Contingencies, a_4

Commitments, Contingencies, and Financial Guarantees - Loan Commitments and Standby Letters of Credit (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Unfunded loan commitments	$ 8,979,334	$ 4,489,238
Standby letters of credit	174,070	75,726
Carrying value of letters of credit	$ 800	$ 500

Regulatory Restrictions - Addit

Regulatory Restrictions - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract]
Cash and due from banks held as collateral	$ 0	$ 14.6
Dividend approval threshold, years	2 years

Regulatory Restrictions - Sched

Regulatory Restrictions - Schedule of Capital Ratios (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Old National Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets actual, amount	$ 4,321,716	$ 2,119,176
Common equity Tier 1 capital to risk-weighted assets actual, amount	3,605,393	1,998,056
Tier 1 capital to risk-weighted assets actual, amount	3,849,112	1,998,056
Tier 1 capital to average assets actual, amount	$ 3,849,112	$ 1,998,056
Total capital to risk-weighted assets actual, ratio	0.1202	0.1277
Common equity Tier 1 capital to risk-weighted assets actual, ratio	10.03%	12.04%
Tier 1 capital to risk-weighted assets actual, ratio	0.1071	0.1204
Tier 1 capital to average assets actual, ratio	0.0852	0.0859
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	$ 3,774,845	$ 1,741,789
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	2,516,563	1,161,193
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	3,055,827	1,410,020
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount	$ 1,808,108	$ 930,318
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	$ 3,595,090	$ 1,658,847
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount	$ 2,157,054	$ 995,308
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	$ 4,063,363	$ 2,119,405
Common equity Tier 1 capital to risk-weighted assets actual, amount	3,817,402	2,040,285
Tier 1 capital to risk-weighted assets actual, amount	3,817,402	2,040,285
Tier 1 capital to average assets actual, amount	$ 3,817,402	$ 2,040,285
Total capital to risk-weighted assets actual, ratio	0.1135	0.1282
Common equity Tier 1 capital to risk-weighted assets actual, ratio	10.66%	12.34%
Tier 1 capital to risk-weighted assets actual, ratio	0.1066	0.1234
Tier 1 capital to average assets actual, ratio	0.0847	0.0881
Total capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	$ 3,759,671	$ 1,735,385
Common equity Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	2,506,448	1,156,923
Tier 1 capital to risk-weighted assets fully phased-in regulatory guidelines minimum, amount	3,043,544	1,404,835
Tier 1 capital to average assets fully phased-in regulatory guidelines minimum, amount	$ 1,803,426	$ 926,821
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	$ 3,580,639	$ 1,652,748
Common equity Tier 1 capital to risk-weighted assets well capitalized guidelines, amount	2,327,416	1,074,286
Tier 1 capital to risk-weighted assets well capitalized guidelines, amount	2,864,512	1,322,198
Tier 1 capital to average assets well capitalized guidelines, amount	$ 2,254,282	$ 1,158,526
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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Equity securities, at fair value	$ 52,507	$ 13,211
Investment in affiliates:
Goodwill	1,998,716	1,036,994	$ 1,036,994	$ 1,036,994
Other assets	1,142,315	372,079
Total assets	46,763,372	24,453,564
Liabilities and Shareholders' Equity
Other borrowings	743,003	296,670
Shareholders' equity	5,128,595	3,012,018	$ 2,972,656	$ 2,852,453
Total liabilities and shareholders' equity	46,763,372	24,453,564
Old National Bancorp
Assets
Deposits in affiliate bank	418,959	102,953
Equity securities, at fair value	30,717	3,257
Investment securities - available-for-sale, at fair value (amortized cost $7,772,603 and $7,384,033, respectively)	16,814	13,888
Investment in affiliates:
Banking subsidiaries	5,000,153	3,053,575
Non-banks	44,938	4,949
Goodwill	59,506	0
Other assets	135,025	83,531
Total assets	5,706,112	3,262,153
Liabilities and Shareholders' Equity
Other liabilities	92,758	36,582
Other borrowings	484,759	213,553
Shareholders' equity	5,128,595	3,012,018
Total liabilities and shareholders' equity	$ 5,706,112	$ 3,262,153

Parent Company Financial Stat_4

Parent Company Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expense
Interest on borrowings	$ 126,266	$ 42,249	$ 67,214
Other expenses	76,510	31,697	27,240
Income before income taxes	544,733	338,862	255,556
Income tax expense (benefit)	116,446	61,324	29,147
Net income	428,287	277,538	226,409
Preferred dividends	(14,118)	0	0
Net income applicable to common shareholders	414,169	277,538	226,409
Old National Bancorp
Income
Dividends from affiliates	0	125,000	230,000
Other income	1,733	3,364	4,196
Other income from affiliates	5	5	5
Total income	1,738	128,369	234,201
Expense
Interest on borrowings	16,662	8,285	8,649
Other expenses	37,629	13,951	16,351
Total expense	54,291	22,236	25,000
Income before income taxes	(52,553)	106,133	209,201
Income tax expense (benefit)	(9,901)	(5,113)	(5,317)
Income (loss) before equity in undistributed    earnings of affiliates	(42,652)	111,246	214,518
Equity in undistributed earnings of affiliates	470,939	166,292	11,891
Net income	428,287	277,538	226,409
Preferred dividends	(14,118)	0	0
Net income applicable to common shareholders	$ 414,169	$ 277,538	$ 226,409

Parent Company Financial Stat_5

Parent Company Financial Statements - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities
Net income	$ 428,287	$ 277,538	$ 226,409
Adjustments to reconcile net income to cash    provided by operating activities:
Depreciation	36,436	27,276	28,911
Share-based compensation expense	28,656	7,497	7,707
(Increase) decrease in other assets	(40,518)	2,641	(105,969)
Increase (decrease) in other liabilities	327,369	17,984	15,726
Net cash flows provided by (used in) operating activities	814,425	330,380	219,820
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	1,912,629	0	0
Proceeds from sales of investment securities available-for-sale	20,032	198,886	299,885
Proceeds from sales of equity securities	53,029	544	39,296
Purchases of investment securities	(1,438,572)	(3,321,653)	(2,803,406)
Proceeds from sales of premises and equipment	4,480	29,244	7,826
Purchases of premises and equipment	(37,901)	(48,692)	(30,871)
Net cash flows provided by (used in) investing activities	(1,685,507)	(1,431,583)	(2,141,452)
Cash Flows From Financing Activities
Cash dividends paid	(177,623)	(92,829)	(92,946)
Common stock repurchased	(71,182)	(3,731)	(82,358)
Common stock issued	809	583	577
Net cash flows provided by (used in) financing activities	777,475	1,333,510	2,235,007
Net increase (decrease) in cash and cash equivalents	(93,607)	232,307	313,375
Cash and cash equivalents at beginning of period	822,019	589,712	276,337
Cash and cash equivalents at end of period	728,412	822,019	589,712
Old National Bancorp
Cash Flows From Operating Activities
Net income	428,287	277,538	226,409
Adjustments to reconcile net income to cash    provided by operating activities:
Depreciation	26	30	46
Share-based compensation expense	28,656	7,497	7,707
(Increase) decrease in other assets	(40,620)	10,213	(625)
Increase (decrease) in other liabilities	10,455	(4,918)	1,084
Equity in undistributed earnings of affiliates	(470,939)	(166,292)	(11,891)
Net cash flows provided by (used in) operating activities	(44,135)	124,068	222,730
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	573,099	0	0
Proceeds from sales of investment securities available-for-sale	0	1,000	0
Proceeds from sales of equity securities	44,038	540	4,431
Purchases of investment securities	(9,000)	(15)	(10,073)
Proceeds from sales of premises and equipment	0	0	354
Purchases of premises and equipment	0	(3)	(354)
Net cash flows provided by (used in) investing activities	608,137	1,522	(5,642)
Cash Flows From Financing Activities
Payments for maturities/redemptions of other borrowings	0	0	(10,310)
Cash dividends paid	(177,623)	(92,829)	(92,946)
Common stock repurchased	(71,182)	(3,731)	(82,358)
Common stock issued	809	583	577
Net cash flows provided by (used in) financing activities	(247,996)	(95,977)	(185,037)
Net increase (decrease) in cash and cash equivalents	316,006	29,613	32,051
Cash and cash equivalents at beginning of period	102,953	73,340	41,289
Cash and cash equivalents at end of period	$ 418,959	$ 102,953	$ 73,340

Segment Information (Details)

Segment Information (Details)	12 Months Ended
	Dec. 31, 2022 segment
Community Banking Segment
Segment Reporting Information [Line Items]
Number of reportable operating segment	1