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Loans (Impaired Loans) - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) Contract | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Loan Contract | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans | $ 5,000 |  | $ 5,000 |  |
Impaired loans classified as troubled debt restructured | $ 1,100,000 | $ 207,000 | $ 1,100,000 | $ 207,000 | $ 178,000
Number of new loans considered TDR | Loan |  |  | 5 |  | 0
TDR loans, subsequently defaulted during the period | 0 | 0 | 0 | 0 |
TDR impaired loans paid off | $ 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 | $ 351,000 |  | $ 351,000 |  | $ 600,000
Consumer Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of new loans considered TDR | Contract | 1 |  | 1 |  |
Foreclosed residential real estate property | $ 187,000 | $ 68,000 | $ 187,000 | $ 68,000 |
Residential real estate properties foreclosure proceedings | $ 379,000 | $ 174,000 | $ 379,000 | $ 174,000 |

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