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FAIR VALUE - Assets Measured on Nonrecurring Basis (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]      
Derivatives $ 104,045 $ 75,011 $ 64,641
Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
REO held for sale 18,105    
Derivatives 0    
Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
REO held for sale 18,105    
Derivatives 0    
Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
REO held for sale 0    
REO held for sale, impairment charges 1,475    
Derivatives 0    
Derivatives, impairment charges $ 330