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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Jan. 31, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-15817    
Entity Registrant Name Old National Bancorp    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-1539838    
Entity Address, Address Line One One Main Street    
Entity Address, City or Town Evansville,    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 47708    
City Area Code 800    
Local Phone Number 731-2265    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 4,029,030,047
Entity Common Stock, Shares Outstanding (in shares)   292,704,000  
Documents Incorporated by Reference
Portions of the Proxy Statement for the 2024 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K.
    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000707179    
Amendment Flag true    
Amendment Description Old National Bancorp (the “Company”) filed its Annual Report on Form 10-K for the year ended December 31, 2023 with the U.S. Securities and Exchange Commission (“SEC”) on February 22, 2024 (the “Original Form 10-K”). This Amendment No. 1 to Form 10-K (this “Amendment” or “Form 10-K/A”) is being filed solely to correct a typographical error in the date of the Report of Independent Registered Public Accounting Firm of Crowe LLP included in Part II, Item 8, “Financial Statements and Supplementary Data” of the Original Form 10-K (the “Original Report”). The Original Report was dated February 22, 2024 instead of February 22, 2023.As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), because the Original Report was included within Item 8 of the Original Form 10-K, this Amendment sets forth Item 8 in its entirety. Except for the correction made to the date of the Original Report noted above, no revisions or modifications have been made to the financial statements or any other information contained within Item 8 of the Original Form 10-K.Additionally, in accordance with Rule 12b-15, the Company is including with this Amendment currently dated certifications from its Chairman and Chief Executive Officer and Executive Vice President, Interim Chief Financial Officer, and Chief Strategy Officer. These certifications are filed or furnished, as applicable, as Exhibits 31.1, 31.2, 32.1 and 32.2. The Company is also filing updated consents from Deloitte & Touche LLP and Crowe LLP as Exhibits 23.1 and 23.2, respectively. This Amendment consists solely of the preceding cover page, this explanatory note, the complete text of Item 8, the complete text of Part IV, Item 15, “Exhibits and Financial Statement Schedules,” the signature page, the certifications, and the updated Deloitte & Touche LLP and Crowe LLP consents, as well as updated inline XBRL exhibits.The information contained in this Amendment does not update or reflect events occurring after the filing of the Original Form 10-K. This Amendment should be read in conjunction with the Company’s other filings with the SEC, including the Original Form 10-K.    
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