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Allowance for Loan Losses - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
SecurityLoan
Jun. 30, 2015
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
SecurityLoan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Period for calculating Loss migration rates of portfolio segments       3 years    
Allowance for loan losses $ 14,760     $ 14,760   $ 14,268
Allowance for loan losses look back period 3 years   2 years      
Credit losses, unallocated reserves among total reserves   7.10%     7.10%  
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  
Impaired loans       Greater than $500    
Foreclosed assets $ 494     $ 494   560
Scenario, Previously Reported [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Period for calculating Loss migration rates of portfolio segments       2 years    
Purchased Automobile Loans Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Period for calculating Loss migration rates of portfolio segments       2 years    
Commercial and Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Decreases allowance for loans       $ (625)    
Residential Mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Foreclosed assets 494     494    
Residential mortgages in process of foreclosure 669     669    
TDRs [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 184     $ 184   $ 895