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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Retained Earnings [Member]
Cash dividends on common stock, per share (in dollars per share)	$ 0.15	$ 0.14
Common Stock [Member]
Issuance of common stock, dividend reinvestment plan, shares (in shares)	2,216	2,757
Issuance of common stock, stock incentive plan, shares (in shares)	21,302	27,134
First National Corporation 2014 Stock Incentive Plan [Member]
Repurchase of common stock shares (in shares)	6,495	8,283
Stock Repurchase Plan [Member]
Repurchase of common stock shares (in shares)	1,557

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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