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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Common dividends declared, per share $ 0.26 $ 0.24
Preferred dividends declared, per share $ 15.00 $ 30.00
Preferred stock converted to common stock, shares 882,096 6,900
Redemption of preferred stock, shares 2,367  
Common stock options exercised, shares 3,000 554
Restricted stock awards shares 21,590 13,433
Issuance of treasury stock to 401(k) plan, shares 12,968  
Purchase of treasury shares 684,407 131,500
Treasury stock shares acquired cost per share $ 16.78 $ 16.30