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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                     1,705 1,705
Other comprehensive income                     2,092 2,092
Cash dividends on common stock                     (547) (547)
Stock-based compensation                     132 132
Issuance of common stock, dividend reinvestment plan                     3 32 35
Issuance of common stock, stock incentive plan                     11 (11)
Repurchase of common stock $ (3) $ (44) $ (47) $ (161) $ (1,910) $ (2,071)          
Balance at Mar. 31, 2020                     6,062 5,899 63,741 2,816 78,518
Balance at Dec. 31, 2020                     6,075 6,151 69,292 3,398 84,916 [1]
Net income                     2,436 2,436
Other comprehensive income                     (916) (916)
Cash dividends on common stock                     (584) (584)
Stock-based compensation                     74 74
Issuance of common stock, dividend reinvestment plan                     3 36 39
Issuance of common stock, stock incentive plan                     10 (10)
Repurchase of common stock $ (2) $ (37) $ (39)                    
Balance at Mar. 31, 2021                     $ 6,086 $ 6,214 $ 71,144 $ 2,482 $ 85,926
[1] Derived from audited consolidated financial statements.