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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Valuation allowance expense for OREO assets $ 145 $ 53 $ 236
Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Aggregated unpaid principal balances $ 19,800 $ 25,500  
Insured Servicing Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate (percent) 1.55% 1.55%  
Uninsured Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate (percent) 20.00% 20.00%