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Condensed Financial Statements of Parent Company - Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities |  |  |
Net income | $ 20,095 | $ 18,402 | $ 14,949
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Other assets and liabilities | (573) | 5,951 | (7,466)
Net cash provided by operating activities | 27,382 | 23,931 | 10,737
Activity in available-for-sale securities: |  |  |
Maturities, prepayments and calls | 91,003 | 67,071 | 29,691
Sales | 11,843 | 11,100 | 10,081
Purchases | (183,563) | (110,166) | (13,866)
Net cash provided by (used in) investing activities | (177,724) | (149,316) | 1,471
Cash Flows from Financing Activities |  |  |
Payment of dividends | (7,186) | (6,345) | (4,956)
Purchase of treasury stock | (383) | (381) | (490)
Net cash provided by (used in) financing activities | 274,752 | 138,316 | (8,310)
Net Increase in Cash and Cash Equivalents | 124,410 | 12,931 | 3,898
Cash and Cash Equivalents - Beginning of Year | 51,296 | 38,365 | 34,467
Cash and Cash Equivalents - End of Year | 175,706 | 51,296 | 38,365
Farmers & Merchants State Bank [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net income | 20,095 | 18,402 | 14,949
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed net income | (11,652) | (5,724) | (6,887)
Net amortization of securities | 154 | 99 | 190
Other assets and liabilities | 2,814 | (1,604) | (6,991)
Net cash provided by operating activities | 11,411 | 11,173 | 1,261
Activity in available-for-sale securities: |  |  |
Maturities, prepayments and calls | 385 | 7,060 | 5,030
Sales |  | 500 | 3,300
Purchases | (745) | (11,453) | (2,695)
Net cash provided by (used in) investing activities | (360) | (3,893) | 5,635
Cash Flows from Financing Activities |  |  |
Payment of dividends | (7,186) | (6,345) | (4,956)
Purchase of treasury stock | (383) | (381) | (490)
Net cash provided by (used in) financing activities | (7,569) | (6,726) | (5,446)
Net Increase in Cash and Cash Equivalents | 3,482 | 554 | 1,450
Cash and Cash Equivalents - Beginning of Year | 2,281 | 1,727 | 277
Cash and Cash Equivalents - End of Year | $ 5,763 | $ 2,281 | $ 1,727

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