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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]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2020           $ 6,075 $ 6,151 $ 69,292 $ 3,398 $ 84,916
Net income           0 0 2,436 0 2,436
Other comprehensive income (loss)           0 0 0 (916) (916)
Cash dividends on common stock           0 0 (584) 0 (584)
Stock-based compensation           0 74 0 0 74
Issuance of common stock, dividend reinvestment plan           3 36 0 0 39
Issuance of 8,073 shares 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
Balance at Dec. 31, 2021           7,785 31,966 76,990 298 117,039
Net income           0 0 3,729 0 3,729
Other comprehensive income (loss)           0 0 0 (13,690) (13,690)
Cash dividends on common stock           0 0 (874) 0 (874)
Stock-based compensation           0 485 0 0 485
Issuance of common stock, dividend reinvestment plan           3 54 0 0 57
Issuance of 8,073 shares common stock, stock incentive plan           34 (34) 0 0 0
Repurchase of common stock $ (10) $ (173) $ 0 $ 0 $ (183)          
Balance at Mar. 31, 2022           $ 7,812 $ 32,298 $ 79,845 $ (13,392) $ 106,563