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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]
Employee Stock Ownership Plan [Member]
Common Stock [Member]
Employee Stock Ownership Plan [Member]
Additional Paid-in Capital [Member]
Employee Stock Ownership Plan [Member]
Retained Earnings [Member]
Employee Stock Ownership Plan [Member]
AOCI Attributable to Parent [Member]
Employee Stock Ownership 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 9,556 0 9,556
Other comprehensive income                               0 0 0 2,532 2,532
Cash dividends on common stock                               0 0 (1,787) 0 (1,787)
Stock-based compensation                               0 183 0 0 183
Issuance of common stock, dividend reinvestment plan                               7 106 0 0 113
Issuance of common stock, stock incentive plan                               12 (12) 0 0 0
Repurchase of common stock $ (2) $ (18) $ 0 $ 0 $ (20) $ (2) $ (30) $ 0 $ 0 $ (32)                    
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                               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 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