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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common dividends declared, per share (in dollars per share)	$ 1.04	$ 1.00	$ 0.96
Common stock options exercised, shares (in shares)	39,995	0	8,459
Issuance of stock to 401(k) plan, shares (in shares)	16,716	22,693	12,407
Repurchase of common shares, shares (in shares)	949,386	734,653	487,400
Repurchase of common shares, per share (in dollars per share)	$ 30.42	$ 29.77	$ 33.57

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