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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]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2017                     $ 6,182 $ 7,260 $ 45,670 $ (958) $ 58,154
Net income                     10,135 10,135
Other comprehensive loss                     (850) (850)
Cash dividends on common stock                     (991) (991)
Stock-based compensation                     189 189
Issuance of common stock, dividend reinvestment plan                     4 58 62
Issuance of common stock, stock incentive plan                     12 (12)
Repurchase of common stock $ (1) $ (23) $ (24) $ (1) $ (1)          
Balance at Dec. 31, 2018                     6,197 7,471 54,814 (1,808) 66,674
Net income                     9,556 9,556
Other comprehensive loss                     2,532 2,532
Cash dividends on common stock                     (1,787) (1,787)
Stock-based compensation                     183 183
Issuance of common stock, dividend reinvestment plan                     7 106 113
Issuance of common stock, stock incentive plan                     12 (12)
Repurchase of common stock $ (2) $ (18) $ (20) $ (2) $ (30) $ (32)          
Balance at Dec. 31, 2019                     $ 6,212 $ 7,700 $ 62,583 $ 724 $ 77,219