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Condensed Financial Statements of Parent Company - Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows from Operating Activities |  |  |
Net income | $ 18,402 | $ 14,949 | $ 12,720
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Other assets and liabilities | 5,665 | (7,828) | (436)
Net cash provided by operating activities | 23,931 | 10,737 | 17,649
Activity in available-for-sale securities: |  |  |
Maturities, prepayments and calls | 67,071 | 29,691 | 23,064
Sales | 11,100 | 10,081 | 13,562
Purchases | (110,166) | (13,866) | (15,335)
Net cash provided by (used in) investing activities | (149,316) | 1,471 | (48,173)
Cash Flows from Financing Activities |  |  |
Payment of dividends | (6,345) | (4,956) | (4,443)
Purchase of Treasury stock | (381) | (490) | (196)
Net cash provided by (used in) financing activities | 138,316 | (8,310) | 36,669
Net Increase in Cash and Cash Equivalents | 12,931 | 3,898 | 6,145
Cash and Cash Equivalents - Beginning of Year | 38,365 | 34,467 | 28,322
Cash and Cash Equivalents - End of Year | 51,296 | 38,365 | 34,467
Farmers & Merchants State Bank [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net income | 18,402 | 14,949 | 12,720
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed net income (distributions in excess earnings) of subsidiaries | (5,724) | (6,887) | (5,963)
Accretion and amortization of securities | 99 | 190 | 206
Other assets and liabilities | (1,604) | (6,991) | 159
Net cash provided by operating activities | 11,173 | 1,261 | 7,122
Activity in available-for-sale securities: |  |  |
Maturities, prepayments and calls | 7,060 | 5,030 | 2,815
Sales | 500 | 3,300 |
Purchases | (11,453) | (2,695) | (4,482)
Purchases of certificates of deposit |  |  | (1,974)
Net cash provided by (used in) investing activities | (3,893) | 5,635 | (3,641)
Cash Flows from Financing Activities |  |  |
Payment of dividends | (6,345) | (4,956) | (4,443)
Purchase of Treasury stock | (381) | (490) | (196)
Net cash provided by (used in) financing activities | (6,726) | (5,446) | (4,639)
Net Increase in Cash and Cash Equivalents | 554 | 1,450 | (1,158)
Cash and Cash Equivalents - Beginning of Year | 1,727 | 277 | 1,435
Cash and Cash Equivalents - End of Year | $ 2,281 | $ 1,727 | $ 277

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