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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Common dividends declared, per share | $ 0.44 | $ 0.40
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 | 11,730 | 3,000
Restricted stock awards shares | 15,587 | 22,561
Issuance of treasury stock to 401(k) plan, shares | 16,290 | 18,275
Purchase of treasury shares | 1,152,776 | 1,018,726
Treasury stock shares acquired cost per share | $ 20.00 | $ 17.13

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