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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, 2018                     $ 6,197 $ 7,471 $ 54,814 $ (1,808) $ 66,674
Net income                     2,261 2,261
Other comprehensive income                     1,188 1,188
Cash dividends on common stock                     (446) (446)
Stock-based compensation                     43 43
Issuance of common stock, dividend reinvestment plan                     2 26 28
Issuance of common stock, stock incentive plan                     7 (7)
Repurchase of common stock $ (2) $ (18) $ (20)                    
Balance at Mar. 31, 2019                     6,204 7,515 56,629 (620) 69,728
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