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Loans (Impaired Loans) - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Additional funds available to be advanced in connection with impaired loans | $ 7 |
Impaired loans classified as troubled debt restructured | $ 178 | $ 700
TDR loans, subsequently defaulted during the period | 0 | 0
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 | $ 600 | $ 674
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Foreclosed residential real estate property | 61 | 25
Residential real estate properties foreclosure proceedings | $ 278 | $ 55

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