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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [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] | 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, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,785 | $ 31,966 | $ 76,990 | $ 298 | $ 117,039
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 12,018 | 0 | 12,018
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (28,051) | (28,051)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (2,626) | 0 | (2,626)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 728 | 0 | 0 | 728
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 142 | 0 | 0 | 152
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43 | (43) | 0 | 0 | 0
Repurchase of 3,674 shares of common stock, stock repurchase plan |  |  |  |  |  |  |  |  |  |  | $ (10) | $ (173) | $ 0 | $ 0 | $ (183) |  |  |  |  |
Balance at Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,828 | 32,620 | 86,382 | (27,753) | 99,077
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,815 | 32,398 | 82,804 | (22,702) | 100,315
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 4,454 | 0 | 4,454
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (5,051) | (5,051)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (876) | 0 | (876)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 187 | 0 | 0 | 187
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 44 | 0 | 0 | 48
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | (9) | 0 | 0 | 0
Balance at Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,828 | 32,620 | 86,382 | (27,753) | 99,077
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2022 | $ 0 | $ 0 | $ (1,952) | $ 0 | $ (1,952) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,831 | 32,716 | 90,284 | (22,471) | 108,360
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 10,475 | 0 | 10,475
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (2,204) | (2,204)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (2,819) | 0 | (2,819)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 681 | 0 | 0 | 681
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 111 | 0 | 0 | 120
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41 | (41) | 0 | 0 | 0
Repurchase of 3,674 shares of common stock, stock repurchase plan |  |  |  |  |  |  |  |  |  |  | $ (8) | $ (106) | $ 0 | $ 0 | $ (114) | (47) | (521) | 0 | 0 | (568)
Balance at Sep. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,826 | 32,840 | 95,988 | (24,675) | 111,979
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,813 | 32,601 | 93,805 | (21,359) | 112,860
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,121 | 0 | 3,121
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (3,316) | (3,316)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (938) | 0 | (938)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 274 | 0 | 0 | 274
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 37 | 0 | 0 | 40
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | (15) | 0 | 0 | 0
Repurchase of 3,674 shares of common stock, stock repurchase plan |  |  |  |  |  | $ (5) | $ (57) | $ 0 | $ 0 | $ (62) |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,826 | $ 32,840 | $ 95,988 | $ (24,675) | $ 111,979

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