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Condensed Financial Statements of Parent Company - Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	[1]
Related party receivables:
Total Assets	$ 1,107,009	$ 1,055,895
Liabilities
Dividends payable	1,193	1,053
Total liabilities	972,872	930,318
Stockholders' Equity	134,137	125,577	$ 120,097	$ 114,493
Total Liabilities and Stockholders' Equity	1,107,009	1,055,895
Farmers & Merchants State Bank [Member]
Assets
Cash	277	1,435
Related party receivables:
Dividends & Accounts receivable from subsidiaries	2,038	1,842
Accrued interest receivable Municipals	110	63
Note receivable from Bank subsidiary	0	0
Securities-Municipals	18,944	17,290
Certificate of Deposits	1,974
Investment in subsidiaries	112,025	106,044
Total Assets	135,368	126,674
Liabilities
Accrued expenses	39	44
Dividends payable	1,192	1,053
Total liabilities	1,231	1,097
Stockholders' Equity	134,137	125,577
Total Liabilities and Stockholders' Equity	$ 135,368	$ 126,674
[1] Share data has been adjusted to reflect a 2-for-1 stock split on September 20, 2017

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