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Loans (Impaired Loans) - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired loans classified as troubled debt restructured $ 540 $ 557 $ 562
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 $ 615 $ 774  
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Foreclosed residential real estate property 25   808
Residential real estate properties foreclosure proceedings $ 59   $ 211