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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value Assets Measured On Recurring Basis        
Impaired collateral dependent loans, charge-offs $ 1,900,000 $ 473,000 $ 2,100,000 $ 952,000
Collateral dependent impaired loans, recorded investment 35,200,000   35,200,000  
Specific valuation allowance allocations 3,700,000   3,700,000  
Reported net carrying amount of impaired loans 31,500,000   $ 31,500,000  
Valuation of loan servicing rights, discount rate     8.00%  
Net impairment charges (recoveries) on its loan servicing rights (50,000) 265,000 $ (51,000) 457,000
Foreclosed assets measured at fair value upon initial recognition 1,300,000      
Allowance for loan losses, charge-offs 282,000 489,000 994,000 922,000
Loss due to re-measurement of repossessed assets   295,000 $ 290,000 912,000
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     25.00%  
Available for Sale Securities        
Fair Value Assets Measured On Recurring Basis        
Changes in unrealized losses on Level 3 securities $ 0 $ 0 $ 0 $ 0