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Allowance for Loan Losses - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Contract
SecurityLoan
Mar. 31, 2016
USD ($)
Contract
SecurityLoan
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Period for calculating Loss migration rates of portfolio segments 3 years    
Allowance for loan losses $ 13,300   $ 13,305
Number of days past due for loans to be considered as nonperforming 90 days    
Reasonable period for nonperforming TDRs to be returned to performing status 6 months    
Number of days reaching where loans are considered for nonaccrual status 90 days    
Conditions where loans are considered for nonaccrual status A loan may be returned to accruing status only if one of three conditions are met the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months    
Loans modified in troubled debt restructuring | Contract 0 6  
Defaulted loans | SecurityLoan 0 0  
Impaired loans Greater than $350    
Allowance for loan losses recorded for acquired loans $ 162 $ 113  
Foreclosed assets 88   37
TDRs [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses 444   278
Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Foreclosed assets 88    
Residential mortgages in process of foreclosure $ 580   $ 710