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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value Assets Measured On Recurring Basis        
Impaired collateral dependent loans, charge-offs $ 0 $ 3,700,000 $ 2,100,000 $ 4,700,000
Collateral dependent impaired loans, recorded investment 38,300,000   38,300,000  
Specific valuation allowance allocations 5,000,000   5,000,000  
Reported net carrying amount of impaired loans 33,300,000   $ 33,300,000  
Valuation of loan servicing rights, discount rate     8.00%  
Net impairment charges (recoveries) on its loan servicing rights (134,000) 0 $ (185,000) 457,000
Foreclosed assets measured at fair value upon initial recognition 1,800,000      
Allowance for loan losses, charge-offs 536,000 245,000 1,500,000 1,200,000
Loss due to re-measurement of repossessed assets 0 34,000 $ 290,000 946,000
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