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Allowance for Loan Losses - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2014
SecurityLoan
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2014
SecurityLoan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Historical loss percentage period for portfolio segments     2 years    
Allowance for loan losses $ 14,707   $ 14,707   $ 14,268
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.    
Defaulted loans | SecurityLoan 0 0 0 0  
Increase in Loan modified in TDR     $ 272    
Impaired loans     Greater than $500    
Foreclosed assets $ 473   $ 473   560
Residential Mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Foreclosed assets 473   473    
Residential mortgages in process of foreclosure 1,052   1,052    
TDRs [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses $ 337   $ 337   $ 895