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SERVICING RIGHTS - Summary of Key Characteristics, Inputs and Economic Assumptions Used to Estimate Fair Value of MSRs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of retained MSRs $ 1,157 $ 1,770 $ 31,852 $ 76,121
Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of retained MSRs $ 1,157 $ 1,704    
Discount rate (percent) 13.00% 13.00%    
Constant prepayment rate (percent) 18.96% 17.21%    
Weighted-average life (in years) 4 years 4 months 28 days 4 years 11 months 4 days