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v3.25.0.1

Condensed Financial Statements of Parent Company - Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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)

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