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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
First National Corporation 2014 Stock Incentive Plan [Member]
Repurchase of common stock shares (in shares)	2,221	2,223
Stock Repurchase Plan [Member]
Repurchase of common stock shares (in shares)		129,035
Cash dividends on common stock, per share (in dollars per share)	$ 0.48	$ 0.44
Issuance of common stock, dividend reinvestment plan, shares (in shares)	7,861	9,449
Issuance of common stock, stock incentive plan, shares (in shares)	14,073	12,492
Shares issued, acquisition (in shares)	1,348,065

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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