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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
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, 2019                     $ 6,212 $ 7,700 $ 62,583 $ 724 $ 77,219
Net income                     0 0 3,948 0 3,948
Other comprehensive income                     0 0 0 2,581 2,581
Cash dividends on common stock                     0 0 (1,080) 0 (1,080)
Stock-based compensation                     0 168 0 0 168
Issuance of common stock, dividend reinvestment plan                     6 64 0 0 70
Balance at Jun. 30, 2020                     6,065 5,967 65,451 3,305 80,788
Issuance of common stock, stock incentive plan                     11 (11) 0 0 0
Repurchase of common stock $ (3) $ (44) $ 0 $ 0 $ (47) $ (161) $ (1,910) $ 0 $ 0 $ (2,071)          
Balance at Mar. 31, 2020                     6,062 5,899 63,741 2,816 78,518
Net income                     0 0 2,243 0 2,243
Other comprehensive income                     0 0 0 489 489
Cash dividends on common stock                     0 0 (533) 0 (533)
Stock-based compensation                     0 36 0 0 36
Issuance of common stock, dividend reinvestment plan                     3 32 0 0 35
Balance at Jun. 30, 2020                     6,065 5,967 65,451 3,305 80,788
Balance at Dec. 31, 2020                     6,075 6,151 69,292 3,398 84,916 [1]
Net income                     0 0 5,778 0 5,778
Other comprehensive income                     0 0 0 (1,000) (1,000)
Cash dividends on common stock                     0 0 (1,169) 0 (1,169)
Stock-based compensation                     0 119 0 0 119
Issuance of common stock, dividend reinvestment plan                     5 72 0 0 77
Balance at Jun. 30, 2021                     6,088 6,295 73,901 2,398 88,682
Issuance of common stock, stock incentive plan                     10 (10) 0 0 0
Repurchase of common stock $ (2) $ (37) $ 0 $ 0 $ (39)                    
Balance at Mar. 31, 2021                     6,086 6,214 71,144 2,482 85,926
Net income                     0 0 3,342 0 3,342
Other comprehensive income                     0 0 0 (84) (84)
Cash dividends on common stock                     0 0 (585) 0 (585)
Stock-based compensation                     0 45 0 0 45
Issuance of common stock, dividend reinvestment plan                     2 36 0 0 38
Balance at Jun. 30, 2021                     $ 6,088 $ 6,295 $ 73,901 $ 2,398 $ 88,682
[1] Derived from audited consolidated financial statements.