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Loans (Impaired Loans) - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired loans classified as troubled debt restructured | $ 107 | $ 546 | $ 107 | $ 546 | $ 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 | $ 649 |  | $ 649 |  | $ 674
Consumer Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Foreclosed residential real estate property | 0 | $ 25 | 0 | $ 25 |
Residential real estate properties foreclosure proceedings | $ 255 | $ 36 | $ 255 | $ 36 |

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