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Other Borrowings - Other Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Lease liability $ 25,798 $ 24,822
Other borrowings 852,429 689,618
Old National Bank    
Debt Instrument [Line Items]    
Other basis adjustments 10,789 112,853
Lease liability 25,798 24,822
Derivative collateralize position amount 10,800 112,800
Old National Bancorp    
Debt Instrument [Line Items]    
Other basis adjustments 7,891 13,049
Other borrowings 356,390 329,692
Subordinated Debt | Old National Bank    
Debt Instrument [Line Items]    
Subordinated debentures $ 0 12,000
Subordinated Debt | Subordinated debentures (fixed rate 5.88%) maturing September 2026 | Old National Bancorp    
Debt Instrument [Line Items]    
Fixed rates 5.88%  
Subordinated debentures $ 150,000 150,000
Subordinated Debt | Subordinated debentures redeemed in September 2025 | Old National Bancorp    
Debt Instrument [Line Items]    
Subordinated debentures 0 30,000
Junior Subordinated Debentures | Old National Bancorp    
Debt Instrument [Line Items]    
Junior subordinated debentures (rates of 5.38% to 7.68%) maturing July 2031 to September 2037 $ 198,499 136,643
Junior Subordinated Debentures | Minimum | Old National Bancorp    
Debt Instrument [Line Items]    
Variable rates 5.38%  
Junior Subordinated Debentures | Maximum | Old National Bancorp    
Debt Instrument [Line Items]    
Variable rates 7.68%  
Leveraged Loans for NMTC | Old National Bank    
Debt Instrument [Line Items]    
Leveraged loans for NMTC (fixed rates of 1.00% to 7.25%) maturing December 2027 to December 2060 $ 459,452 $ 210,251
Leveraged Loans for NMTC | Minimum | Old National Bank    
Debt Instrument [Line Items]    
Fixed rates 1.00%  
Leveraged Loans for NMTC | Maximum | Old National Bank    
Debt Instrument [Line Items]    
Fixed rates 7.25%