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Loans (Impaired Loans) - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired loans classified as troubled debt restructured | $ 551,000 | $ 700,000 | $ 1,100,000
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 | $ 774,000 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Foreclosed residential real estate property | 169,000 |  | 456,000
Residential real estate properties foreclosure proceedings | $ 190,000 |  | $ 568,000

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