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Condensed Financial Statements of Parent Company - Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income |  |  |  |  |  |  |  |  |  |  |
Interest - municipals / certificates of deposit |  |  |  |  |  |  |  |  | $ 1,079 | $ 837 | $ 1,095
Loss on sales of available-for-sale securities |  |  |  |  |  |  |  |  | 270 | (26) | (9)
Total interest income | $ 18,139 | $ 17,293 | $ 17,273 | $ 17,464 | $ 17,149 | $ 17,012 | $ 18,283 | $ 15,862 | 70,169 | 68,306 | 46,429
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries | 8,467 | 5,697 | 5,965 | 5,077 | 5,852 | 5,234 | 7,728 | 3,948 |  |  |
Income Taxes (Benefit) | 1,691 | 1,287 | 1,161 | 972 | 1,129 | 959 | 1,548 | 724 | 5,111 | 4,360 | 3,301
Net Income | $ 6,776 | $ 4,410 | $ 4,804 | $ 4,105 | $ 4,723 | $ 4,275 | $ 6,180 | $ 3,224 | 20,095 | 18,402 | 14,949
Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income |  |  |  |  |  |  |  |  | 24,694 | 22,514 | 14,120
Farmers & Merchants State Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 8,800 | 13,137 | 8,350
Interest - municipals / certificates of deposit |  |  |  |  |  |  |  |  | 382 | 374 | 389
Loss on sales of available-for-sale securities |  |  |  |  |  |  |  |  |  |  | (19)
Total interest income |  |  |  |  |  |  |  |  | 9,182 | 13,511 | 8,720
Operating Expenses |  |  |  |  |  |  |  |  | 923 | 999 | 1,020
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 8,259 | 12,512 | 7,700
Income Taxes (Benefit) |  |  |  |  |  |  |  |  | (184) | (166) | (362)
Income from operation before equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 8,443 | 12,678 | 8,062
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 11,652 | 5,724 | 6,887
Net Income |  |  |  |  |  |  |  |  | 20,095 | 18,402 | 14,949
Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on securities |  |  |  |  |  |  |  |  | 4,599 | 4,112 | (829)
Comprehensive Income |  |  |  |  |  |  |  |  | $ 24,694 | $ 22,514 | $ 14,120

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