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Consolidated Statements of Changes in Shareholders' Equity - 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 8,858 0 8,858
Other comprehensive income (loss)                     0 0 0 2,674 2,674
Cash dividends on common stock                     0 0 (2,149) 0 (2,149)
Stock-based compensation                     0 290 0 0 290
Issuance of common stock, dividend reinvestment plan                     11 131 0 0 142
Issuance of 12,492 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 Dec. 31, 2020                     6,075 6,151 69,292 3,398 84,916
Net income                     0 0 10,359 0 10,359
Other comprehensive income (loss)                     0 0 0 (3,100) (3,100)
Cash dividends on common stock                     0 0 (2,661) 0 (2,661)
Stock-based compensation                     0 354 0 0 354
Issuance of common stock, dividend reinvestment plan                     9 147 0 0 156
Issuance of 12,492 shares common stock, stock incentive plan                     18 (18) 0 0 0
Repurchase of common stock $ (2) $ (37) $ 0 $ 0 $ (39)                    
Shares issued to shareholders of The Bank of Fincastle, net of costs (1,348,065 shares)                     1,685 25,369 0 0 27,054
Balance at Dec. 31, 2021                     $ 7,785 $ 31,966 $ 76,990 $ 298 $ 117,039