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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Retained Earnings [Member] |  |
Common dividends declared, per share (in dollars per share) | $ 0.57 | $ 0.50
Special common dividends declared, per share (in dollars per share) | $ 0.48 |
Additional Paid-in Capital [Member] |  |
Common stock options exercised, shares (in shares) | 18,979 | 8,036
Treasury Stock [Member] |  |
Issuance of treasury stock to 401(k) plan, shares (in shares) | 1,053 | 12,834
Purchase of treasury shares, shares (in shares) | 670,016 | 50,118
Purchase of treasury shares, per share (in dollars per share) | $ 31.77 | $ 25.20
Common dividends declared, per share (in dollars per share) | $ 1.05 | $ 0.50

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