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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Common dividends declared, per share (in dollars per share)	$ 0.25	$ 0.25	$ 0.50	$ 0.50
Issuance of stock to 401(k) plan, shares (in shares)	3,499	5,294	9,151	11,911
Repurchase of common shares, shares (in shares)			449,300	734,653
Repurchase of common shares, per share (in dollars per share)	$ 30.51		$ 28.86	$ 29.77

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