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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] | Stock Repurchase Plan [Member] Common Stock [Member] | Stock Repurchase Plan [Member] Additional Paid-in Capital [Member] | Stock Repurchase Plan [Member] Retained Earnings [Member] | Stock Repurchase Plan [Member] AOCI Attributable to Parent [Member] | Stock Repurchase Plan [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,197 | $ 7,471 | $ 54,814 | $ (1,808) | $ 66,674 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 6,840 | 0 | 6,840 |
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 2,952 | 2,952 |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (1,340) | 0 | (1,340) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 159 | 0 | 0 | 159 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 78 | 0 | 0 | 83 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | (12) | 0 | 0 | 0 |
Repurchase of common stock | $ (2) | $ (30) | $ 0 | $ 0 | $ (32) | $ (2) | $ (18) | $ 0 | $ 0 | $ (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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 2,493 | 0 | 2,493 |
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 375 | 375 |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (447) | 0 | (447) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 91 | 0 | 0 | 91 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 26 | 0 | 0 | 27 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | (5) | 0 | 0 | 0 |
Repurchase of common stock | $ (2) | $ (30) | $ 0 | $ 0 | $ (32) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,210 | 7,648 | 60,314 | 1,144 | 75,316 |
Balance at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,212 | 7,700 | 62,583 | 724 | 77,219 | [1]
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 5,702 | 0 | 5,702 |
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 2,708 | 2,708 |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (1,615) | 0 | (1,615) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 254 | 0 | 0 | 254 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 97 | 0 | 0 | 106 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 | (16) | 0 | 0 | 0 |
Repurchase of common stock |  |  |  |  |  | $ (3) | $ (44) | $ 0 | $ 0 | $ (47) | $ (161) | $ (1,910) | $ 0 | $ 0 | $ (2,071) |  |  |  |  |  |
Balance at Sep. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,073 | 6,081 | 66,670 | 3,432 | 82,256 |
Balance at Jun. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,065 | 5,967 | 65,451 | 3,305 | 80,788 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 1,754 | 0 | 1,754 |
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 127 | 127 |
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (535) | 0 | (535) |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 86 | 0 | 0 | 86 |
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 33 | 0 | 0 | 36 |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | (5) | 0 | 0 | 0 |
Balance at Sep. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,073 | $ 6,081 | $ 66,670 | $ 3,432 | $ 82,256 |
[1] | Derived from audited consolidated financial statements.

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