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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Assets Measured On Recurring Basis    
Impaired collateral dependent loans, charge-offs $ 0 $ 219,000
Collateral dependent impaired loans, recorded investment 60,900,000  
Specific valuation allowance allocations 20,000,000  
Reported net carrying amount of impaired loans $ 40,900,000  
Valuation of loan servicing rights, discount rate 8.00%  
Net impairment charges (recoveries) on its loan servicing rights $ (227,000)  
Foreclosed assets measured at fair value upon initial recognition 923,000  
Loss due to re-measurement of repossessed assets 290,000
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