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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income |  |  |  |  |  |  |  |  |  |  |
Interest - municipals / certificates of deposit |  |  |  |  |  |  |  |  | $ 837 | $ 1,095 | $ 1,193
Net gain (loss) on sale of available-for-sale securities |  |  |  |  |  |  |  |  | (26) | (9) | 47
Total interest income | $ 17,149 | $ 17,012 | $ 18,283 | $ 15,862 | $ 12,003 | $ 11,753 | $ 11,537 | $ 11,136 | 68,306 | 46,429 | 41,248
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries | 5,825 | 5,208 | 7,670 | 3,931 | 4,029 | 4,498 | 5,046 | 4,603 |  |  |
Income Taxes (Benefit) | 1,102 | 933 | 1,490 | 707 | 836 | 623 | 932 | 836 | 4,232 | 3,227 | 5,183
Net Income | $ 4,723 | $ 4,275 | $ 6,180 | $ 3,224 | $ 3,193 | $ 3,875 | $ 4,114 | $ 3,767 | 18,402 | 14,949 | 12,720
Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income |  |  |  |  |  |  |  |  | 22,514 | 14,120 | 12,866
Farmers & Merchants State Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 13,137 | 8,350 | 6,850
Interest - municipals / certificates of deposit |  |  |  |  |  |  |  |  | 374 | 389 | 313
Net gain (loss) on sale of available-for-sale securities |  |  |  |  |  |  |  |  |  | (19) |
Total interest income |  |  |  |  |  |  |  |  | 13,511 | 8,720 | 7,163
Operating Expenses |  |  |  |  |  |  |  |  | 999 | 1,020 | 828
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 12,512 | 7,700 | 6,335
Income Taxes (Benefit) |  |  |  |  |  |  |  |  | (166) | (362) | (422)
Income from operation before equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 12,678 | 8,062 | 6,757
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 5,724 | 6,887 | 5,963
Net Income |  |  |  |  |  |  |  |  | 18,402 | 14,949 | 12,720
Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on securities |  |  |  |  |  |  |  |  | 4,112 | (829) | 146
Comprehensive Income |  |  |  |  |  |  |  |  | $ 22,514 | $ 14,120 | $ 12,866

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