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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact of the Busey's other asset investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Other asset investments | $ 127,068 | $ 126,349
Funded investments | Other assets |  |
Schedule of Equity Method Investments [Line Items] |  |
Other asset investments | 68,516 | 58,912
Unfunded investments | Other assets |  |
Schedule of Equity Method Investments [Line Items] |  |
Other asset investments | 58,552 | 67,437
Unfunded investments | Other liabilities |  |
Schedule of Equity Method Investments [Line Items] |  |
Unfunded investment obligations | $ 58,552 | $ 67,437

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