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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income                      
Interest                 $ 37,195 $ 33,703 $ 29,293
Interest Municipals                 1,193 1,437 1,739
Gain on sales of available-for-sale securities                 47 588 451
Total interest income $ 10,868 $ 10,535 $ 10,124 $ 9,721 $ 9,746 $ 9,590 $ 9,387 $ 9,004 41,248 37,727 33,650
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries 5,019 4,381 4,521 3,982 4,501 4,176 4,228 3,415      
Income Taxes (Benefit) 1,583 1,159 1,298 1,143 1,307 1,161 1,254 934 5,183 4,656 3,819
Net Income $ 3,436 $ 3,222 $ 3,223 $ 2,839 $ 3,194 $ 3,015 $ 2,974 $ 2,481 12,720 11,664 10,340
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities                 267 (2,721) 100
Comprehensive Income                 12,866 9,480 10,108
Farmers & Merchants State Bank [Member]                      
Income                      
Dividends from subsidiaries                 6,850 6,000 6,220
Interest                 0 0 0
Interest Municipals                 313 272 219
Gain on sales of available-for-sale securities                     124
Total interest income                 7,163 6,272 6,563
Operating Expenses                 828 681 677
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries                 6,335 5,591 5,886
Income Taxes (Benefit)                 (422) (238) (188)
Income from operation before equity in undistributed earnings of subsidiary                 6,757 5,829 6,074
Equity in undistributed earnings of Subsidiaries                 5,963 5,835 4,266
Net Income                 12,720 11,664 10,340
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities                 146 (2,184) (232)
Comprehensive Income                 $ 12,866 $ 9,480 $ 10,108