CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Sale of treasury stock (in shares)	482,460
Preferred Stock | Series C Preferred Stock
Issuance of preferred stock (in shares)			135,000
Dividends on preferred stock (in dollars per share)	$ 65	$ 65	$ 53.44
Common Stock
Common stock repurchased (in shares)	431,707
Dividends on common stock (in dollars per share)	$ 0.16	$ 0.16	$ 0.16
Sale of treasury stock (in shares)	482,460	615,340
Restricted stock grants (in shares)	429,752	514,507	536,110
Restricted stock units vesting (in shares)	366,400
Forfeitures of restricted stock (in shares)	65,946	31,408	113,468