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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Common dividends declared, per share $ 0.14 $ 0.13
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   3,000
Restricted stock awards shares 12,882 6,594
Issuance of treasury stock to 401(k) plan, shares 7,727 6,599
Purchase of treasury shares 487,739 339,234
Treasury stock shares acquired cost per share $ 18.14 $ 16.47