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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Common dividends declared, per share (in dollars per share) | $ 1.12 | $ 1.04 | $ 1.00
Issuance of stock to 401(k) plan, shares (in shares) | 20,584 | 16,716 | 22,693
Repurchase of common shares, shares (in shares) | 706,117 | 949,386 | 734,653
Repurchase of common shares, per share (in dollars per share) | $ 30.18 | $ 30.42 | $ 29.77
Common stock options exercised, shares (in shares) | 7,575 | 39,995 |

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