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Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Constant prepayment rate 8.80% 9.80% 12.00%  
Discount rate 14.00% 10.00% 10.00%  
Mortgage Servicing Rights [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgages Servicing Rights, Fair Value $ 6,595 $ 7,618 $ 7,378 $ 6,165
Minimum [Member] | Mortgage Servicing Rights [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 14.00%      
Minimum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Constant prepayment rate 6.90%      
Maximum [Member] | Mortgage Servicing Rights [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 16.00%      
Maximum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Constant prepayment rate 16.60%      
Weighted Average [Member] | Mortgage Servicing Rights [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Discount rate 14.00%      
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flow [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Constant prepayment rate 8.80%