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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, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income                      
Noninterest income                 $ 15,621 $ 15,905 $ 15,796
Total interest income $ 41,851 $ 41,901 $ 41,166 $ 38,654 $ 38,270 $ 36,359 $ 33,377 $ 31,802 163,572 139,808 101,149
Expenses                      
Interest 19,021 20,312 19,791 18,536 18,335 16,697 13,259 10,120 77,660 58,411 14,362
Net income before income taxes 10,527 8,109 7,159 6,778 6,875 5,898 7,532 8,049 32,573 28,354 40,475
Income Taxes (Benefit) 2,146 1,593 1,477 1,419 1,332 1,121 1,531 1,583 6,635 5,567 7,960
Net Income $ 8,381 $ 6,516 $ 5,682 $ 5,359 $ 5,543 $ 4,777 $ 6,001 $ 6,466 25,938 22,787 32,515
Other Comprehensive Income (Loss):                      
Comprehensive Income (Loss)                 29,727 32,008 (2,534)
Farmers & Merchants State Bank [Member]                      
Income                      
Dividends from subsidiaries                 12,100 7,500 44,285
Distributed earnings of dissolved subsidiary                   1,005  
Interest - available-for-sale securities / interest-bearing time deposits                 240 162 308
Noninterest income                 23 4  
Total interest income                 12,363 8,671 44,593
Expenses                      
Interest                 1,138 1,258 1,588
Operating expenses                 1,178 1,143 1,176
Total expenses                 2,316 2,401 2,764
Net income before income taxes                 10,047 6,270 41,829
Income Taxes (Benefit)                 (452) (495) (535)
Income from operation before equity in undistributed (distributions in excess of) earnings of subsidiaries                 10,499 6,765 42,364
Equity in undistributed (distributions in excess of) earnings of subsidiaries                 15,439 16,022 (9,849)
Net Income                 25,938 22,787 32,515
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities, net of taxes                 3,789 9,221 (35,049)
Comprehensive Income (Loss)                 $ 29,727 $ 32,008 $ (2,534)