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Condensed Financial Statements of Parent Company - Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Related party receivables: |  |  |  |
Total Assets | $ 1,909,544 | $ 1,607,330 |  |
Liabilities |  |  |  |
Dividends payable | 1,889 | 1,768 |  |
Total liabilities | 1,660,384 | 1,377,072 |  |
Stockholders' Equity | 249,160 | 230,258 | $ 143,287 | $ 134,107
Total Liabilities and Stockholders' Equity | 1,909,544 | 1,607,330 |  |
Farmers & Merchants State Bank [Member] |  |  |  |
Assets |  |  |  |
Cash | 5,763 | 2,281 |  |
Related party receivables: |  |  |  |
Dividends and accounts receivable from subsidiary | 3,380 | 4,080 |  |
Accrued interest receivable - municipals | 91 | 75 |  |
Securities - municipals | 17,885 | 17,196 |  |
Certificate of deposits | 1,727 | 1,974 |  |
Investment in subsidiaries | 222,423 | 206,553 |  |
Total Assets | 251,269 | 232,159 |  |
Liabilities |  |  |  |
Accrued expenses | 220 | 133 |  |
Dividends payable | 1,889 | 1,768 |  |
Total liabilities | 2,109 | 1,901 |  |
Stockholders' Equity | 249,160 | 230,258 |  |
Total Liabilities and Stockholders' Equity | $ 251,269 | $ 232,159 |  |

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