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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Common dividends declared, per share $ 0.60 $ 0.54 $ 0.50
Preferred dividends declared, per share   $ 15.00 $ 60.00
Preferred stock converted to common stock, shares   882,096 6,900
Redemption of preferred stock, shares   2,367  
Common stock options exercised, shares 43,463 4,323 3,854
Restricted stock awards shares 16,680 23,057 13,933
Issuance of treasury stock to 401(k) plan, shares 18,218 20,745  
Purchase of treasury shares 1,182,294 1,238,299 132,773
Treasury stock shares acquired cost per share $ 20.06 $ 17.35 $ 16.29