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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing rights, held-for-sale, fair value $ 29,793    
Net gains (losses) attributable to instrument-specific credit risk 0 $ 0 $ 0
Net change in valuation allowance 236 31 $ 38
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 $ 99,700 $ 58,300  
Insured Servicing Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate 1.55% 1.55%  
Uninsured Servicing Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate 20.00%