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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 11, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unamortized retained loan discounts $ 8,100   $ 7,800  
Loan receivable, nonaccrual, past due period (more than) 60 days      
Loans receivable, impairment and (recovery) recorded $ 92 $ (52)    
Loan loss reserves 989   885  
PMC Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Discount on acquisition       $ 33,900
Acquisition discount $ 470   $ 492