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Other Borrowings - Other Borrowings (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2017 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Lease liability |  | $ 20,955 | $ 13,469
Other borrowings |  | 764,870 | 743,003
Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Other basis adjustments |  | 97,872 | 89,588
Lease liability |  | 20,955 | 13,469
Derivative collateralize position amount |  | 97,600 | 88,000
Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Other basis adjustments |  | 18,207 | 23,363
Other borrowings |  | $ 479,759 | 484,759
Senior Unsecured Notes | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates |  | 4.125% |
Senior unsecured notes (fixed rate 4.125%) maturing August 2024 |  | $ 175,000 | 175,000
Unamortized debt issuance costs related to senior unsecured notes |  | $ (91) | (247)
Subordinated Debt | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates |  | 10.01% |
LIBOR rate | 4.618% |  |
Subordinated debentures |  | $ 12,000 | 12,000
Subordinated Debt | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates |  | 5.875% |
Subordinated debentures |  | $ 150,000 | 150,000
Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Junior subordinated debentures (rates of 6.95% to 9.22%) maturing July 2031 to September 2037 |  | 136,643 | 136,643
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 |  | $ 154,284 | $ 143,187
Minimum | Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Variable rates |  | 6.95% |
Minimum | Leveraged Loans for NMTC | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates |  | 1.00% |
Maximum | Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Variable rates |  | 9.22% |
Maximum | Leveraged Loans for NMTC | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates |  | 1.43% |

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