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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Assets Measured On Recurring Basis    
Impaired collateral dependent loans, charge-offs $ 479,000 $ 850,000
Collateral dependent impaired loans, recorded investment 7,100,000  
Specific valuation allowance allocations 872,000  
Reported net carrying amount of impaired loans $ 6,200,000  
Valuation of loan servicing rights, discount rate 8.00%  
Net recoveries of impairment charges on its loan servicing rights $ 192,000 84,000
Maximum discount on foreclosed assets 3.70%  
Foreclosed assets measured at fair value upon initial recognition $ 2,600,000  
Allowance for loan losses, charge-offs 139,000 457,000
Loss due to re-measurement of repossessed assets $ 617,000  
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