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Other Borrowings - Schedule of Other Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |
Lease liability | $ 17,233 | $ 11,813 |
Other borrowings | 296,670 | 252,787 |
Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Other basis adjustments | 2,839 | 428 |
Lease liability | 17,233 | 11,813 |
Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Other basis adjustments | (3,044) | (3,195) |
Other borrowings | $ 213,553 | 213,246 |
Senior Unsecured Notes | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates | 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 | (403) | (559) |
Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Junior subordinated debentures (variable rates of 1.72% to 1.97%) maturing March 2035 to June 2037 | $ 42,000 | 42,000 |
Subordinated Debt | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates | 4.49% |  |
Subordinated debentures (variable rate 4.49%) | $ 12,000 | 12,000 |
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 December 2052 | $ 51,045 | $ 15,300 |
Minimum | Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Variable rates | 1.72% |  |
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 | 1.97% |  |
Maximum | Leveraged Loans for NMTC | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rates | 1.43% |  |

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