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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, 2017
Dec. 31, 2016
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Mortgage servicing rights including discontinued operations $ 38,715 $ 76,121 $ 42,109 $ 62,676 $ 52,567 $ 49,939
Banc Home Loan | Discontinued Operations, Disposed of by Sale            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Servicing rights carried at fair value 0 37,681 $ 0 $ 30,800 $ 24,400 $ 23,000
Recurring | Significant Unobservable Inputs (Level 3)            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
SBA servicing rights 38,715          
Mortgage servicing rights including discontinued operations   76,121        
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
SBA servicing rights $ 38,715          
Mortgage servicing rights including discontinued operations   $ 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 9.25% 9.11%        
Prepayment rate 7.00% 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 15.00% 15.00%        
Prepayment rate 43.31% 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 10.96% 10.18%        
Prepayment rate 14.49% 11.84%