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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information About Level 3 Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value $ 31,852 $ 76,121 $ 49,939 $ 19,082
Servicing rights, held-for-sale, fair value 29,793      
Significant Unobservable Inputs (Level 3)        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value 2,059 76,121    
Recurring | Significant Unobservable Inputs (Level 3)        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value 31,852      
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value $ 2,059 $ 76,121    
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Minimum        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 13.00% 9.11%    
Prepayment Rate 10.04% 7.00%    
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Maximum        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 13.00% 15.00%    
Prepayment Rate 49.97% 39.90%    
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted cash flow | Weighted Average        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 13.00% 10.18%    
Prepayment Rate 16.54% 11.84%    
Discontinued Operations, Disposed of by Sale | Banc Home Loan        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Servicing rights carried at fair value $ 0 $ 37,681 $ 22,900 $ 10,700