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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Retained Earnings [Member]    
Common dividends declared, per share (in dollars per share) $ 0.32 $ 0.28
Additional Paid-in Capital [Member]    
Common stock options exercised, shares (in shares) 3,566 11,572
Restricted stock awards, shares (in shares) 21,030 15,020
Treasury Stock [Member]    
Purchase of treasury shares, per share (in dollars per share) $ 24.16 $ 19.52
Issuance of treasury stock to 401(k) plan, shares (in shares) 8,869 12,140
Purchase of treasury shares, shares (in shares) 10,602 981,551
Common dividends declared, per share (in dollars per share) $ 0.32 $ 0.28