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Loans (Impaired Loans) - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2020 Loan | Jun. 30, 2020 USD ($) Contract | Mar. 31, 2020 Contract | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Contract Loan | Jun. 30, 2019 USD ($) Loan | Dec. 31, 2019 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans |  | $ 159,000 |  |  | $ 159,000 |  |
Impaired loans classified as troubled debt restructured |  | $ 6,400,000 |  | $ 981,000 | $ 6,400,000 | $ 981,000 | $ 1,000,000.0
Number of contracts modified | Loan |  |  |  |  | 5 |  | 4
TDR impaired loans paid off | Loan | 1 |  |  |  |  | 0 |
TDR loans, subsequently defaulted during the period |  | 0 |  | 0 | 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 |  | $ 135,000 |  |  | $ 135,000 |  | $ 214,000
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  | 481,000 |  |  | $ 481,000 |  |
Number of contracts modified | Contract |  |  |  |  | 2 |  |
TDR impaired loans paid off | Loan |  |  |  |  | 1 |  |
Consumer Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Foreclosed residential real estate property |  | 0 |  | $ 143,000 | $ 0 | $ 143,000 |
Residential real estate properties foreclosure proceedings |  | $ 854,000 |  | $ 571,000 | $ 854,000 | $ 571,000 |
Principal Forgiveness [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  | 0 |  |
Payment Changes from Monthly Payment to Principal and Interest at Maturity [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of contracts modified | Contract |  |  | 2 |  |  |  |
Loan maturity date |  |  | Jun. 19, 2020 |  |  |  |
Rate Concession Along With the Amortization Extended [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of contracts modified | Contract |  | 3 |  |  |  |  |

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