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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Common dividends declared, per share $ 0.28 $ 0.26
Preferred dividends declared, per share   $ 15
Preferred stock converted to common stock, shares   882,096
Redemption of preferred stock, shares   2,367
Common stock options exercised, shares 11,572 3,000
Restricted stock awards shares 15,020 21,590
Issuance of treasury stock to 401(k) plan, shares 12,140 12,968
Purchase of treasury shares 981,551 684,407
Treasury stock shares acquired cost per share $ 19.52 $ 16.78