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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
 9 Months Ended
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