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REGULATORY CAPITAL - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 02, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 25, 2017
Regulatory Capital |  |  |  |  |
Busey Bank paid dividends to the Company, amount received |  | $ 95.0 | $ 60.0 | $ 122.0 |
Subordinated Debt | 4.75% notes maturing May 25, 2027 |  |  |  |  |
Regulatory Capital |  |  |  |  |
Principal balance |  |  |  |  | $ 60.0
Subordinated Debt | 5.000% notes maturing June 15, 2032 |  |  |  |  |
Regulatory Capital |  |  |  |  |
Principal balance | $ 100.0 |  |  |  |
Fixed to floating interest rate | 5.00% |  |  |  |

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