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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information About Level 3 Fair Value Measurements (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Mortgage servicing rights, at fair value $ 62,676 $ 49,939 $ 52,567 $ 40,837 $ 34,198 $ 19,082
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Mortgage servicing rights, at fair value $ 62,676 $ 49,939        
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights | Discounted cash flow | Minimum            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 8.73% 9.00%        
Prepayment rate 6.00% 6.07%        
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights | Discounted cash flow | Maximum            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 14.50% 18.00%        
Prepayment rate 52.69% 35.01%        
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights | Discounted cash flow | Weighted Average            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 9.81% 9.75%        
Prepayment rate 15.54% 11.81%