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Other Borrowings - Summary of Other Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Aug. 31, 2014
Debt Instrument [Line Items]      
Lease liability $ 21,983 $ 13,469  
Other borrowings 746,869 743,003  
Old National Bank      
Debt Instrument [Line Items]      
Other basis adjustments 85,633 89,588  
Lease liability 21,983 13,469  
Derivative collateralize position amount 84,400 88,000  
Old National Bancorp      
Debt Instrument [Line Items]      
Other basis adjustments $ 22,073 23,363  
Senior Unsecured Notes | Old National Bancorp      
Debt Instrument [Line Items]      
Fixed rate 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 $ (208) (247)  
Subordinated Debt      
Debt Instrument [Line Items]      
Fixed rate 5.875%    
Subordinated Debt | Old National Bank      
Debt Instrument [Line Items]      
Variable rate 9.16%    
Subordinated debentures $ 12,000 12,000  
Subordinated Debt | Old National Bancorp      
Debt Instrument [Line Items]      
Subordinated debentures 150,000 150,000  
Junior Subordinated Debentures | Old National Bancorp      
Debt Instrument [Line Items]      
Junior subordinated debentures (variable rates of    6.27% to 8.41%) maturing July 2031 to September 2037 136,643 136,643  
Notes Payable to Banks | 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 $ 143,745 $ 143,187  
Minimum | Junior Subordinated Debentures | Old National Bancorp      
Debt Instrument [Line Items]      
Variable rate 6.27%    
Minimum | Notes Payable to Banks | Old National Bank      
Debt Instrument [Line Items]      
Fixed rate 1.00%    
Maximum | Junior Subordinated Debentures | Old National Bancorp      
Debt Instrument [Line Items]      
Variable rate 8.41%    
Maximum | Notes Payable to Banks | Old National Bank      
Debt Instrument [Line Items]      
Fixed rate 1.43%