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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Employee Stock Ownership Plan [Member] Common Stock [Member] | Employee Stock Ownership Plan [Member] Additional Paid-in Capital [Member] | Employee Stock Ownership Plan [Member] Retained Earnings [Member] | Employee Stock Ownership Plan [Member] AOCI Attributable to Parent [Member] | Employee Stock Ownership Plan [Member] | First National Corporation 2014 Stock Incentive Plan [Member] Common Stock [Member] | First National Corporation 2014 Stock Incentive Plan [Member] Additional Paid-in Capital [Member] | First National Corporation 2014 Stock Incentive Plan [Member] Retained Earnings [Member] | First National Corporation 2014 Stock Incentive Plan [Member] AOCI Attributable to Parent [Member] | First National Corporation 2014 Stock Incentive Plan [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  | $ 6,182 | $ 7,260 | $ 45,670 | $ (958) | $ 58,154 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 7,814 |  | 7,814 |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,766) | (1,766) |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  | (743) |  | (743) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 170 |  |  | 170 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  | 3 | 43 |  |  | 46 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  | 12 | (12) |  |  |  |
Repurchase of common stock |  |  |  |  |  | $ (1) | $ (23) |  |  | $ (24) |  |  |  |  |  |
Balance at Sep. 30, 2018 |  |  |  |  |  |  |  |  |  |  | 6,196 | 7,438 | 52,741 | (2,724) | 63,651 |
Balance at Jun. 30, 2018 |  |  |  |  |  |  |  |  |  |  | 6,192 | 7,346 | 50,313 | (2,203) | 61,648 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 2,676 |  | 2,676 |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (521) | (521) |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  | (248) |  | (248) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 81 |  |  | 81 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  | 1 | 14 |  |  | 15 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  | 3 | (3) |  |  |  |
Balance at Sep. 30, 2018 |  |  |  |  |  |  |  |  |  |  | 6,196 | 7,438 | 52,741 | (2,724) | 63,651 |
Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  | 6,197 | 7,471 | 54,814 | (1,808) | 66,674 | [1]
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 6,840 |  | 6,840 |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,952 | 2,952 |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  | (1,340) |  | (1,340) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 159 |  |  | 159 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  | 5 | 78 |  |  | 83 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  | 12 | (12) |  |  |  |
Repurchase of common stock | $ (2) | $ (30) |  |  | $ (32) | $ (2) | $ (18) |  |  | $ (20) |  |  |  |  |  |
Balance at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  | 6,210 | 7,648 | 60,314 | 1,144 | 75,316 |
Balance at Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  | 6,206 | 7,566 | 58,268 | 769 | 72,809 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 2,493 |  | 2,493 |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | 375 | 375 |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  | (447) |  | (447) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 91 |  |  | 91 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  | 1 | 26 |  |  | 27 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  | 5 | (5) |  |  |  |
Repurchase of common stock | $ (2) | $ (30) |  |  | $ (32) |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  | $ 6,210 | $ 7,648 | $ 60,314 | $ 1,144 | $ 75,316 |
[1] | Derived from audited consolidated financial statements.

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