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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common dividends declared, per share $ 0.54 $ 0.50 $ 0.48
Preferred dividends declared, per share $ 15.00 $ 60.00 $ 60.00
Preferred stock converted to common stock, shares 882,096 6,900 149,730
Redemption of preferred stock, shares 2,367    
Common stock options exercised, shares 4,323 3,854 5,850
Restricted stock awards shares 23,057 13,933 40,371
Issuance of treasury stock to 401(k) plan, shares 20,745    
Purchase of treasury shares 1,238,299 132,773 1,739,601
Treasury stock shares acquired cost per share $ 17.35 $ 16.29 $ 16.31