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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information About Level 3 Fair Value Measurements (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value $ 49,939 $ 19,082 $ 13,535 $ 1,739
Significant Unobservable Inputs (Level 3)        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value 49,939 13,135    
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value $ 49,939 $ 13,135 $ 13,535  
Recurring | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Mortgage Servicing Rights | Minimum        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 9.00% 9.00% 10.00%  
Prepayment Rate 6.07% 4.59% 4.19%  
Recurring | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Mortgage Servicing Rights | Maximum        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 18.00% 19.50% 17.94%  
Prepayment Rate 35.01% 31.02% 34.54%  
Recurring | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Mortgage Servicing Rights | Weighted Average        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 9.75% 10.09% 10.26%  
Prepayment Rate 11.81% 13.22% 9.85%