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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 5,702 0 5,702
Other comprehensive income (loss)                     0 0 0 2,708 2,708
Cash dividends on common stock                     0 0 (1,615) 0 (1,615)
Stock-based compensation                     0 254 0 0 254
Issuance of common stock, dividend reinvestment plan                     9 97 0 0 106
Issuance of 3,500 shares common stock, stock incentive plan                     16 (16) 0 0 0
Repurchase of common stock $ (3) $ (44) $ 0 $ 0 $ (47) $ (161) $ (1,910) $ 0 $ 0 $ (2,071)          
Balance at Sep. 30, 2020                     6,073 6,081 66,670 3,432 82,256
Balance at Jun. 30, 2020                     6,065 5,967 65,451 3,305 80,788
Net income                     0 0 1,754 0 1,754
Other comprehensive income (loss)                     0 0 0 127 127
Cash dividends on common stock                     0 0 (535) 0 (535)
Stock-based compensation                     0 86 0 0 86
Issuance of common stock, dividend reinvestment plan                     3 33 0 0 36
Issuance of 3,500 shares common stock, stock incentive plan                     5 (5) 0 0 0
Balance at Sep. 30, 2020                     6,073 6,081 66,670 3,432 82,256
Balance at Dec. 31, 2020                     6,075 6,151 69,292 3,398 84,916 [1]
Net income                     0 0 8,176 0 8,176
Other comprehensive income (loss)                     0 0 0 (1,718) (1,718)
Cash dividends on common stock                     0 0 (1,914) 0 (1,914)
Stock-based compensation                     0 300 0 0 300
Issuance of common stock, dividend reinvestment plan                     7 109 0 0 116
Issuance of 3,500 shares common stock, stock incentive plan                     18 (18) 0 0 0
Shares issued to shareholders of The Bank of Fincastle                     1,685 25,384 27,069
Repurchase of common stock $ (2) $ (37) $ 0 $ 0 $ (39)                    
Balance at Sep. 30, 2021                     7,783 31,889 75,554 1,680 116,906
Balance at Jun. 30, 2021                     6,088 6,295 73,901 2,398 88,682
Net income                     0 0 2,398 0 2,398
Other comprehensive income (loss)                     0 0 0 (718) (718)
Cash dividends on common stock                     0 0 (745) 0 (745)
Stock-based compensation                     0 181 0 0 181
Issuance of common stock, dividend reinvestment plan                     2 37 0 0 39
Issuance of 3,500 shares common stock, stock incentive plan                     8 (8) 0 0 0
Shares issued to shareholders of The Bank of Fincastle                     1,685 25,384 27,069
Balance at Sep. 30, 2021                     $ 7,783 $ 31,889 $ 75,554 $ 1,680 $ 116,906
[1] Derived from audited consolidated financial statements.