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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

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