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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, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income                      
Noninterest income                 $ 16,040 $ 15,537 $ 17,609
Gain on sales of available-for-sale securities                 (891)   293
Total interest income $ 38,270 $ 36,359 $ 33,377 $ 31,802 $ 29,492 $ 25,847 $ 23,911 $ 21,899 139,808 101,149 76,840
Expenses                      
Interest 18,335 16,697 13,259 10,120 6,935 3,264 2,047 2,116 58,411 14,362 7,342
Income Before Income Taxes 6,875 5,898 7,532 8,049 8,894 11,207 10,321 10,053 28,354 40,475 29,497
Income Taxes (Benefit) 1,332 1,121 1,531 1,583 1,706 2,253 2,050 1,951 5,567 7,960 6,002
Net Income $ 5,543 $ 4,777 $ 6,001 $ 6,466 $ 7,188 $ 8,954 $ 8,271 $ 8,102 22,787 32,515 23,495
Other Comprehensive Income (Loss):                      
Comprehensive Income (Loss)                 32,008 (2,534) 14,614
Farmers & Merchants State Bank [Member]                      
Income                      
Dividends from subsidiaries                 7,500 44,285 23,200
Distributed earnings of dissolved subsidiary                 1,005    
Interest - available-for-sale securities / interest-bearing time deposits                 162 308 253
Noninterest income                 4    
Gain on sales of available-for-sale securities                     293
Total interest income                 8,671 44,593 23,746
Expenses                      
Interest                 1,258 1,588 743
Operating expenses                 1,143 1,176 1,335
Total expenses                 2,401 2,764 2,078
Income Before Income Taxes                 6,270 41,829 21,668
Income Taxes (Benefit)                 (495) (535) (347)
Income from operation before equity in undistributed (distributions in excess of) earnings of subsidiaries                 6,765 42,364 22,015
Equity in undistributed (distributions in excess of) earnings of subsidiaries                 16,022 (9,849) 1,480
Net Income                 22,787 32,515 23,495
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities, net of taxes                 9,221 (35,049) (8,881)
Comprehensive Income (Loss)                 $ 32,008 $ (2,534) $ 14,614