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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Retained Earnings [Member] |  |
Common dividends declared, per share (in dollars per share) | $ 0.36 | $ 0.32
Additional Paid-in Capital [Member] |  |
Common stock options exercised, shares (in shares) | 10,350 | 3,566
Treasury Stock [Member] |  |
Issuance of treasury stock to 401(k) plan, shares (in shares) | 7,652 | 8,869
Purchase of treasury shares, shares (in shares) | 474,240 | 10,602
Purchase of treasury shares, per share (in dollars per share) | $ 31.03 | $ 24.16
Special common dividends declared, per share (in dollars per share) | 0.48 |
Common dividends declared, per share (in dollars per share) | $ 0.84 | $ 0.32

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