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ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans transferred to held for sale $ 348,761 $ 0
Rocky Mountain Bank    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, excluding accrued interest, transfer out, expense reversal 2,600  
Loans transferred to held for sale $ 348,800