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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, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income                      
Interest - municipals / interest-bearing time deposits                 $ 1,415 $ 1,170 $ 1,079
Loss on sales of available-for-sale securities                   293 270
Total interest income $ 29,492 $ 25,847 $ 23,911 $ 21,899 $ 22,423 $ 20,122 $ 17,530 $ 16,765 101,149 76,840 70,169
Expenses                      
Interest 6,935 3,264 2,047 2,116 2,388 1,672 1,554 1,728 14,362 7,342 10,393
Income Before Income Taxes 8,894 11,207 10,321 10,053 9,682 7,544 6,302 5,969 40,475 29,497 25,206
Income Taxes (Benefit) 1,706 2,253 2,050 1,951 1,999 1,624 1,319 1,060 7,960 6,002 5,111
Net Income $ 7,188 $ 8,954 $ 8,271 $ 8,102 $ 7,683 $ 5,920 $ 4,983 $ 4,909 32,515 23,495 20,095
Other Comprehensive Income (Loss):                      
Comprehensive Income (Loss)                 (2,534) 14,614 24,694
Farmers & Merchants State Bank [Member]                      
Income                      
Dividends from subsidiaries                 44,285 23,200 8,800
Interest - municipals / interest-bearing time deposits                 308 253 382
Loss on sales of available-for-sale securities                   293  
Total interest income                 44,593 23,746 9,182
Expenses                      
Interest                 1,588 743  
Operating expenses                 1,176 1,335 923
Total expenses                 2,764 2,078 923
Income Before Income Taxes                 41,829 21,668 8,259
Income Taxes (Benefit)                 (535) (347) (184)
Income from operation before equity in undistributed earnings of subsidiary                 42,364 22,015 8,443
Equity in undistributed earnings of subsidiaries                 (9,849) 1,480 11,652
Net Income                 32,515 23,495 20,095
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities, net of taxes                 (35,049) (8,881) 4,599
Comprehensive Income (Loss)                 $ (2,534) $ 14,614 $ 24,694