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Allowance for Loan Losses - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
SecurityLoan
Sep. 30, 2015
SecurityLoan
Jun. 30, 2015
Sep. 30, 2016
USD ($)
SecurityLoan
Sep. 30, 2015
SecurityLoan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Period for calculating Loss migration rates of portfolio segments       3 years      
Allowance for loan losses $ 13,451     $ 13,451   $ 14,361  
Proceeds from payoff on previously charged-off loans       $ 1,303      
Allowance for loan losses look back period   3 years 2 years        
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 the borrower has made a minimum of six months payments under the modified terms; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months.      
Defaulted loans | SecurityLoan 0 0   0 0    
Impaired loans       Greater than $350      
Allowance for loan losses recorded for acquired loans       $ 97   123  
Foreclosed assets $ 62     62   116  
Commercial and Agriculture [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Decreases allowance for loans       (625)      
TDRs [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses 214     214   $ 286  
Residential Mortgage [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Foreclosed assets 62     62      
Residential mortgages in process of foreclosure $ 721     $ 721