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PORTFOLIO LOANS - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan origination costs $ 12,000,000   $ 12,000,000   $ 13,500,000
Net accretable purchase accounting adjustments     (9,700,000)   (4,500,000)
Gross interest income that would have been recorded if impaired loans had been current 100,000 $ 200,000 600,000 $ 900,000  
Amount of interest collected and recognized on a cash basis 0 0 0 0  
Collateral dependent loans secured by real estate or business assets 5,200,000   5,200,000   $ 6,100,000
Loans in the process of foreclosure 800,000   800,000    
Retail loans | Commercial and Retail Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans purchased $ 0 $ 0 6,900,000 $ 0  
Commercial loans | Watch          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Limit above which loans are annually reviewed     1,000,000    
Commercial loans | Special Mention          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Limit above which loans are annually reviewed     350,000    
Commercial loans | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Limit where loans are processed through an expedited underwriting process     $ 1,000,000