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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income
Interest - municipals / certificates of deposit									$ 837	$ 1,095	$ 1,193
Net gain (loss) on sale of available-for-sale securities									(26)	(9)	47
Total interest income	$ 17,149	$ 17,012	$ 18,283	$ 15,862	$ 12,003	$ 11,753	$ 11,537	$ 11,136	68,306	46,429	41,248
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries	5,825	5,208	7,670	3,931	4,029	4,498	5,046	4,603
Income Taxes (Benefit)	1,102	933	1,490	707	836	623	932	836	4,232	3,227	5,183
Net Income	$ 4,723	$ 4,275	$ 6,180	$ 3,224	$ 3,193	$ 3,875	$ 4,114	$ 3,767	18,402	14,949	12,720
Other Comprehensive Income (Loss):
Comprehensive Income									22,514	14,120	12,866
Farmers & Merchants State Bank [Member]
Income
Dividends from subsidiaries									13,137	8,350	6,850
Interest - municipals / certificates of deposit									374	389	313
Net gain (loss) on sale of available-for-sale securities										(19)
Total interest income									13,511	8,720	7,163
Operating Expenses									999	1,020	828
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries									12,512	7,700	6,335
Income Taxes (Benefit)									(166)	(362)	(422)
Income from operation before equity in undistributed earnings of subsidiary									12,678	8,062	6,757
Equity in undistributed earnings of subsidiaries									5,724	6,887	5,963
Net Income									18,402	14,949	12,720
Other Comprehensive Income (Loss):
Unrealized gains (losses) on securities									4,112	(829)	146
Comprehensive Income									$ 22,514	$ 14,120	$ 12,866

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