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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
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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

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