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Loans (Impaired Loans) - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans classified as troubled debt restructured $ 700,000 $ 1,100
TDR loans, subsequently defaulted during the period   1
TDR loans, subsequently defaulted after modification loss $ 79,600  
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 $ 774,000 $ 1,175,000
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Foreclosed residential real estate property 169,000 477,000
Residential real estate properties foreclosure proceedings $ 112,000 $ 425,000