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TAX CREDIT AND OTHER INVESTMENTS IN UNCONSOLIDATED ENTITIES - Schedule of Impact of the Busey's other asset investments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated entities | $ 120,878 | $ 127,068
Tax effects of investments in tax-advantaged projects |  |
Income tax credits and other tax benefits | 4,101 |
Amortization of investments in tax-advantaged projects | 3,647 |
Funded investments | Other assets |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated entities | 64,516 | 68,516
Unfunded investments | Other assets |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated entities | 56,362 | 58,552
Unfunded investments | Other liabilities |  |
Schedule of Equity Method Investments [Line Items] |  |
Unfunded investment obligations | $ 56,362 | $ 58,552

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