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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, 2015
Sep. 30, 2014
Dec. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Mortgage servicing rights, at fair value $ 40,837 $ 11,376 $ 19,082 $ 34,198 $ 9,816 $ 13,535
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Mortgage servicing rights, at fair value $ 40,837 $ 11,376 $ 13,135      
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% 10.00% 9.00%      
Prepayment rate 6.07% 4.71% 4.59%      
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% 21.22% 19.50%      
Prepayment rate 34.69% 34.76% 31.02%      
Recurring | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Mortgage servicing rights | Weighted Average            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 9.88% 10.70% 10.09%      
Prepayment rate 12.09% 12.41% 13.22%