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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Security
Dec. 31, 2015
USD ($)
Security
Dec. 31, 2014
USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value, unobservable inputs, quantitative information for assets measured on non-recurring basis, impaired loans non-current appraisal discount percentage 6.30%    
Impaired collateral dependent loans, charge-offs $ 4,300 $ 5,400  
Collateral dependent impaired loans, recorded investment 8,400 15,800  
Specific valuation allowance allocations 3,000 352  
Reported net carrying amount of impaired loans $ 5,400 15,400  
Valuation of loan servicing rights, discount rate 8.00%    
Net impairment (recovery of impairment) on loan servicing rights $ 611 (303) $ 88
Foreclosed assets measured at fair value upon initial recognition 4,500 16,700  
Allowance for loan losses, charge-offs 1,700 1,600  
Loss due to re-measurement of repossessed assets $ 1,000 $ 2,000 $ 4,700
Minimum      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation of loan servicing rights, prepayment rate 0.00%    
Maximum      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation of loan servicing rights, prepayment rate 27.00%    
Trust preferred securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Number of available for sale securities (in security) | Security 2 2  
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Number of available for sale securities (in security) | Security 4    
Significant Unobservable Inputs (Level 3) | Trust preferred securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Number of available for sale securities (in security) | Security 1