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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value Assets Measured On Recurring Basis        
Impaired collateral dependent loans, charge-offs $ 3,700,000 $ 366,000 $ 4,700,000 $ 3,000,000
Collateral dependent impaired loans, recorded investment 2,600,000   2,600,000  
Specific valuation allowance allocations 350,000   350,000  
Reported net carrying amount of impaired loans 2,200,000   $ 2,200,000  
Valuation of loan servicing rights, discount rate     8.00%  
Net impairment charges (recoveries) on its loan servicing rights 0 (48,000) $ 457,000 (209,000)
Maximum discount on foreclosed assets     4.80%  
Foreclosed assets measured at fair value upon initial recognition 1,700,000      
Allowance for loan losses, charge-offs 245,000 629,000 $ 1,200,000 1,500,000
Loss due to re-measurement of repossessed assets 34,000 1,300,000 $ 946,000 1,800,000
Minimum        
Fair Value Assets Measured On Recurring Basis        
Valuation of loan servicing rights, prepayment rate     0.00%  
Maximum        
Fair Value Assets Measured On Recurring Basis        
Valuation of loan servicing rights, prepayment rate     24.00%  
Available-for-sale Securities        
Fair Value Assets Measured On Recurring Basis        
Changes in unrealized losses on Level 3 securities $ 0 $ 0 $ 0 $ 0