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v3.21.1

Other Borrowings - Summary of Other Borrowings (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |
Lease liability | $ 11,561 | $ 11,813 |
Other borrowings | 266,282 | 252,787 |
Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Other basis adjustments | 3,743 | 428 |
Lease liability | 11,561 | 11,813 |
Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Other basis adjustments | $ (3,157) | (3,195) |
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 | (520) | (559) |
Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Junior subordinated debentures (variable rates of 1.75% to 1.93%) maturing March 2035 to June 2037 | $ 42,000 | 42,000 |
Subordinated Debt | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate | 4.56% |  |
Subordinated debentures (variable rate 4.56%) | $ 12,000 | 12,000 |
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 December 2052 | $ 25,655 | $ 15,300 |
Minimum | Junior Subordinated Debentures | Old National Bancorp |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate | 1.75% |  |
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 | 1.93% |  |
Maximum | Notes Payable to Banks | Old National Bank |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate | 1.43% |  |

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