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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