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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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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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