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Condensed Financial Statements of Parent Company - Statements of Cash Flows (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
Cash Flows from Operating Activities                      
Net income $ 3,436 $ 3,222 $ 3,223 $ 2,839 $ 3,194 $ 3,015 $ 2,974 $ 2,481 $ 12,720 $ 11,664 $ 10,340
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:                      
Gain on Sale of Available for Sale Securities                 (47) (588) (451)
Changes in Assets and Liabilities:                      
Other Assets and Liabilities                 1,194 (688) 1,275
Net Cash Provided by Operating Activities                 19,258 12,430 14,809
Activity in available for sale securities:                      
Maturities, prepayments and calls                 23,064 41,825 26,059
Sales                 13,562 85,723 47,029
Purchases                 (15,335) (114,819) (60,925)
Net cash used in investing activities                 (49,782) (64,190) (53,972)
Cash Flows from Financing Activities                      
Payment of dividends                 (4,443) (4,115) (3,943)
Purchase of Treasury Stock                 (196) (194) (803)
Net cash provided by financing activities                 36,669 58,064 36,886
Net Increase (Decrease) in Cash and Cash Equivalents                 6,145 6,304 (2,277)
Farmers & Merchants State Bank [Member]                      
Cash Flows from Operating Activities                      
Net income                 12,720 11,664 10,340
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:                      
Equity in undistributed net income (Distributions in excess earnings) of subsidiaries                 (5,963) (5,835) (4,266)
Accretion & Amortization of Securities                 206 179 152
Gain on Sale of Available for Sale Securities                     (124)
Changes in Assets and Liabilities:                      
Dividends receivable                     475
Other Assets and Liabilities                 199 355 156
Net Cash Provided by Operating Activities                 7,162 6,363 6,733
Activity in available for sale securities:                      
Maturities, prepayments and calls                 2,815 1,485 1,000
Sales                     6,282
Purchases                 (4,482) (2,891) (8,784)
Purchases of Certificates of Deposit                 (1,974)    
Net cash used in investing activities                 (3,641) (1,406) (1,502)
Cash Flows from Financing Activities                      
Payment of dividends                 (4,443) (4,115) (3,943)
Purchase of Treasury Stock                 (236) (194) (803)
Net cash provided by financing activities                 (4,679) (4,309) (4,746)
Net Increase (Decrease) in Cash and Cash Equivalents                 (1,158) 648 485
Cash and Cash Equivalents                      
Cash and Cash Equivalents - Beginning of Year       $ 1,435       $ 787 1,435 787 302
Cash and Cash Equivalents - End of Year $ 277       $ 1,435       $ 277 $ 1,435 $ 787