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