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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