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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
(Decrease) increase in GNMA loans subject to a repurchase option $ (66,000)    
Servicing rights, held-for-sale, fair value 66 $ 29,800  
Net gains (losses) attributable to instrument-specific credit risk 0 0 $ 0
Net change in valuation allowance 53 236 $ 31
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 $ 25,500 99,700  
Insured Servicing Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate 1.55%    
Uninsured Servicing Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate 20.00%    
Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans held for sale   66,000  
Third Party Provider's Valuation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing rights, held-for-sale, fair value $ 1,700 2,100  
Adjusted market bid valuation | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing rights, held-for-sale, fair value $ 66 $ 29,800