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Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Constant prepayment rate 12.80% 10.50%        
Discount rate 12.00% 10.00%        
Mortgage Servicing Rights [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Mortgages Servicing Rights, Fair Value $ 6,208 $ 7,467 $ 7,618 $ 6,720 $ 7,814 $ 7,378
Minimum [Member] | Mortgage Servicing Rights [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 12.00%   10.00%      
Minimum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Constant prepayment rate 6.50%   6.30%      
Maximum [Member] | Mortgage Servicing Rights [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 14.00%   12.00%      
Maximum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Constant prepayment rate 20.60%   20.50%      
Weighted Average [Member] | Mortgage Servicing Rights [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Discount rate 12.00%   10.00%      
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Constant prepayment rate 12.80%   9.50%