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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Retained Earnings [Member]      
Common dividends declared, per share (in dollars per share) $ 0.68 $ 0.60 $ 0.54
Preferred dividends declared, per share (in dollars per share)     $ 15
Common Stock [Member]      
Preferred stock converted to common stock, shares (in shares)     882,096
Preferred Stock [Member]      
Redemption of preferred stock, shares (in shares)     2,367
Additional Paid-in Capital [Member]      
Common stock options exercised, shares (in shares) 16,185 43,463 4,323
Restricted stock awards, shares (in shares) 22,697 16,680 23,057
Treasury Stock [Member]      
Issuance of treasury stock to 401(k) plan, shares (in shares) 15,254 18,218 20,745
Purchase of treasury shares, shares (in shares) 50,118 1,182,294 1,238,299
Purchase of treasury shares, per share (in dollars per share) $ 25.16 $ 20.06 $ 17.35
Common dividends declared, per share (in dollars per share) $ 0.68 $ 0.60 $ 0.54
Common stock options exercised, shares (in shares) 16,185