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Loans (Impaired Loans) - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Additional funds available to be advanced in connection with impaired loans $ 20   $ 20    
Impaired loans classified as troubled debt restructured $ 98 $ 540 $ 98 $ 540 $ 534
TDR loans, subsequently defaulted during the period 0 0 0 0  
TDR impaired loans paid off     $ 418    
Maximum time for re-evaluation (in months)     12 months    
Re-evaluation period for real estate     2 years    
Unsecured consumer loans, credit card credits and overdraft lines of credit reach     90 days    
Delinquent period for charging down consumer loans     120 days    
Delinquent period for charging down commercial and agricultural credits     120 days    
Foreclosed residential real estate property $ 717   $ 717   $ 674
Consumer Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Foreclosed residential real estate property 68 $ 25 68 $ 25  
Residential real estate properties foreclosure proceedings $ 174 $ 59 $ 174 $ 59