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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common dividends declared, per share (in dollars per share) | $ 1.00 | $ 0.96 | $ 0.78
Special common dividends declared, per share (in dollars per share) |  |  | $ 0.48
Common stock options exercised, shares (in shares) | (0) | 8,459 | 24,186
Issuance of stock to 401(k) plan, shares (in shares) | 22,693 | 12,407 | 11,331
Purchase of treasury shares, shares (in shares) |  |  | 1,060,312
Purchase of treasury shares, per share (in dollars per share) |  |  | $ 32.45
Repurchase of common shares, shares (in shares) | 734,653 | 487,400 |
Repurchase of common shares, per share (in dollars per share) | $ 29.77 | $ 33.57 |

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