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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                     0 0 4,347 0 4,347
Other comprehensive income                     0 0 0 2,577 2,577
Cash dividends on common stock                     0 0 (893) 0 (893)
Stock-based compensation                     0 68 0 0 68
Issuance of common stock, dividend reinvestment plan                     4 52 0 0 56
Issuance of common stock, stock incentive plan                     7 (7) 0 0 0
Repurchase of common stock $ (2) $ (18) $ 0 $ 0 $ (20)                    
Balance at Jun. 30, 2019                     6,206 7,566 58,268 769 72,809
Balance at Mar. 31, 2019                     6,204 7,515 56,629 (620) 69,728
Net income                     0 0 2,086 0 2,086
Other comprehensive income                     0 0 0 1,389 1,389
Cash dividends on common stock                     0 0 (447) 0 (447)
Stock-based compensation                     0 25 0 0 25
Issuance of common stock, dividend reinvestment plan                     2 26 0 0 28
Balance at Jun. 30, 2019                     6,206 7,566 58,268 769 72,809
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
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 Jun. 30, 2020                     6,065 5,967 65,451 3,305 80,788
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