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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