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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] | 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, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,785 | $ 31,966 | $ 76,990 | $ 298 | $ 117,039
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,729 | 0 | 3,729
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (13,690) | (13,690)
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (874) | 0 | (874)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 485 | 0 | 0 | 485
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 54 | 0 | 0 | 57
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 | (34) | 0 | 0 | 0
Repurchase of common stock, stock incentive plan |  |  |  |  |  | $ (10) | $ (173) | $ 0 | $ 0 | $ (183) |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,812 | 32,298 | 79,845 | (13,392) | 106,563
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 | 3,849 | 0 | 3,849
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 2,255 | 2,255
Cash dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (942) | 0 | (942)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 338 | 0 | 0 | 338
Issuance of common stock, dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 38 | 0 | 0 | 41
Issuance of common stock, stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 | (27) | 0 | 0 | 0
Repurchase of common stock, stock incentive plan |  |  |  |  |  | $ (8) | $ (105) | $ 0 | $ 0 | $ (113) | $ (2) | $ (23) | $ 0 | $ 0 | $ (25) |  |  |  |  |
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,851 | $ 32,937 | $ 91,239 | $ (20,216) | $ 111,811

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