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PORTFOLIO LOANS - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan origination (fees) costs $ 13,400,000   $ 13,500,000
Net accretable purchase accounting adjustments (4,300,000)   (4,500,000)
Gross interest income that would have been recorded if impaired loans had been current 300,000 $ 400,000  
Amount of interest collected and recognized on a cash basis 0 0  
Collateral dependent loans secured by real estate or business assets 14,200,000   $ 6,100,000
Loans in the process of foreclosure 900,000    
Retail real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased 0 $ 0  
Commercial real estate | Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Limit where loans are processed through an expedited underwriting process 1,000,000    
Total commercial loans | Watch      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Limit above which loans are annually reviewed 1,000,000    
Total commercial loans | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Limit above which loans are annually reviewed $ 350,000