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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 | 7,564 | 0 | 7,564
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (23,000) | (23,000)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (1,750) | 0 | (1,750)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 541 | 0 | 0 | 541
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 98 | 0 | 0 | 104
Repurchase of 32,301 shares of common stock, stock repurchase plan |  |  |  |  |  |  |  |  |  |  | $ (10) | $ (173) | $ 0 | $ 0 | $ (183) |  |  |  |  |
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 | (34) | 0 | 0 | 0
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,815 | 32,398 | 82,804 | (22,702) | 100,315
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,812 | 32,298 | 79,845 | (13,392) | 106,563
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,835 | 0 | 3,835
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (9,310) | (9,310)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (876) | 0 | (876)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 56 | 0 | 0 | 56
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 44 | 0 | 0 | 47
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,815 | 32,398 | 82,804 | (22,702) | 100,315
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 | 7,354 | 0 | 7,354
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 1,112 | 1,112
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (1,881) | 0 | (1,881)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 407 | 0 | 0 | 407
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 74 | 0 | 0 | 80
Repurchase of 32,301 shares of common stock, stock repurchase plan |  |  |  |  |  |  |  |  |  |  | $ (8) | $ (105) | $ 0 | $ 0 | $ (113) | (43) | (464) | 0 | 0 | (507)
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 | (27) | 0 | 0 | 0
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,813 | 32,601 | 93,805 | (21,359) | 112,860
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,851 | 32,937 | 91,239 | (20,216) | 111,811
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,505 | 0 | 3,505
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1,143) | (1,143)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (939) | 0 | (939)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 69 | 0 | 0 | 69
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 36 | 0 | 0 | 39
Repurchase of 32,301 shares of common stock, stock repurchase plan |  |  |  |  |  | $ (41) | $ (441) | $ 0 | $ 0 | $ (482) |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,813 | $ 32,601 | $ 93,805 | $ (21,359) | $ 112,860

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