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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