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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income                      
Interest                 $ 33,703 $ 29,293 $ 28,070
Interest Municipals                 1,437 1,739 2,037
Gain on sales of available-for-sale securities                 588 451 494
Total interest income $ 9,746 $ 9,590 $ 9,387 $ 9,004 $ 8,733 $ 8,444 $ 8,289 $ 8,184 37,727 33,650 33,453
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries 4,501 4,176 4,228 3,415 3,821 3,581 3,553 3,204      
Income Taxes (Benefit) 1,307 1,161 1,254 934 1,049 961 956 853 4,656 3,819 3,871
Net Income $ 3,194 $ 3,015 $ 2,974 $ 2,481 $ 2,772 $ 2,620 $ 2,597 $ 2,351 11,664 10,340 9,646
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities                 (2,721) 100 1,158
Comprehensive Income                 9,480 10,108 10,084
Farmers & Merchants State Bank [Member]                      
Income                      
Dividends from subsidiaries                 6,000 6,220 5,725
Interest                 0 0 0
Interest Municipals                 272 219 215
Gain on sales of available-for-sale securities                   124  
Total interest income                 6,272 6,563 5,940
Operating Expenses                 681 677 577
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries                 5,591 5,886 5,363
Income Taxes (Benefit)                 (238) (188) (196)
Income from operation before equity in undistributed earnings of subsidiary                 5,829 6,074 5,559
Equity in undistributed earnings of Subsidiaries                 5,835 4,266 4,087
Net Income                 11,664 10,340 9,646
Other Comprehensive Income (Loss):                      
Unrealized gains (losses) on securities                 (2,184) (232) 438
Comprehensive Income                 $ 9,480 $ 10,108 $ 10,084