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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