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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
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]
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 6,840 0 6,840
Other comprehensive income                               0 0 0 2,952 2,952
Cash dividends on common stock                               0 0 (1,340) 0 (1,340)
Stock-based compensation                               0 159 0 0 159
Issuance of common stock, dividend reinvestment plan                               5 78 0 0 83
Issuance of common stock, stock incentive plan                               12 (12) 0 0 0
Repurchase of common stock $ (2) $ (30) $ 0 $ 0 $ (32) $ (2) $ (18) $ 0 $ 0 $ (20)                    
Balance at Sep. 30, 2019                               6,210 7,648 60,314 1,144 75,316
Balance at Jun. 30, 2019                               6,206 7,566 58,268 769 72,809
Net income                               0 0 2,493 0 2,493
Other comprehensive income                               0 0 0 375 375
Cash dividends on common stock                               0 0 (447) 0 (447)
Stock-based compensation                               0 91 0 0 91
Issuance of common stock, dividend reinvestment plan                               1 26 0 0 27
Issuance of common stock, stock incentive plan                               5 (5) 0 0 0
Repurchase of common stock $ (2) $ (30) $ 0 $ 0 $ (32)                              
Balance at Sep. 30, 2019                               6,210 7,648 60,314 1,144 75,316
Balance at Dec. 31, 2019                               6,212 7,700 62,583 724 77,219 [1]
Net income                               0 0 5,702 0 5,702
Other comprehensive income                               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 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                               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 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
[1] Derived from audited consolidated financial statements.