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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Common dividends declared, per share $ 0.40 $ 0.37
Preferred dividends declared, per share $ 15.00 $ 45.00
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 22,561 13,933
Issuance of treasury stock to 401(k) plan, shares 18,275  
Purchase of treasury shares 1,018,726 132,773
Treasury stock shares acquired cost per share $ 17.13 $ 16.29