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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, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income |  |  |  |  |  |  |  |  |  |  |
Interest - municipals / interest-bearing time deposits |  |  |  |  |  |  |  |  | $ 1,170 | $ 1,079 | $ 837
Loss on sales of available-for-sale securities |  |  |  |  |  |  |  |  | 293 | 270 | (26)
Total interest income | $ 22,423 | $ 20,122 | $ 17,530 | $ 16,765 | $ 18,139 | $ 17,293 | $ 17,273 | $ 17,464 | 76,840 | 70,169 | 68,306
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest | 2,388 | 1,672 | 1,554 | 1,728 | 2,015 | 2,269 | 2,698 | 3,411 | 7,342 | 10,393 | 14,759
Income Before Income Taxes | 9,682 | 7,544 | 6,302 | 5,969 | 8,467 | 5,697 | 5,965 | 5,077 | 29,497 | 25,206 | 22,762
Income Taxes (Benefit) | 1,999 | 1,624 | 1,319 | 1,060 | 1,691 | 1,287 | 1,161 | 972 | 6,002 | 5,111 | 4,360
Net Income | $ 7,683 | $ 5,920 | $ 4,983 | $ 4,909 | $ 6,776 | $ 4,410 | $ 4,804 | $ 4,105 | 23,495 | 20,095 | 18,402
Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income |  |  |  |  |  |  |  |  | 14,614 | 24,694 | 22,514
Farmers & Merchants State Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 23,200 | 8,800 | 13,137
Interest - municipals / interest-bearing time deposits |  |  |  |  |  |  |  |  | 253 | 382 | 374
Loss on sales of available-for-sale securities |  |  |  |  |  |  |  |  | 293 |  |
Total interest income |  |  |  |  |  |  |  |  | 23,746 | 9,182 | 13,511
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 743 |  |
Operating expenses |  |  |  |  |  |  |  |  | 1,335 | 923 | 999
Total expenses |  |  |  |  |  |  |  |  | 2,078 | 923 | 999
Income Before Income Taxes |  |  |  |  |  |  |  |  | 21,668 | 8,259 | 12,512
Income Taxes (Benefit) |  |  |  |  |  |  |  |  | (347) | (184) | (166)
Income from operation before equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 22,015 | 8,443 | 12,678
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 1,480 | 11,652 | 5,724
Net Income |  |  |  |  |  |  |  |  | 23,495 | 20,095 | 18,402
Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on securities, net of taxes |  |  |  |  |  |  |  |  | (8,881) | 4,599 | 4,112
Comprehensive Income |  |  |  |  |  |  |  |  | $ 14,614 | $ 24,694 | $ 22,514

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