CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends on preferred stock (in dollars per share)	$ 65	$ 65	$ 65
Dividends on common stock (in dollars per share)	$ 0.16	$ 0.16	$ 0.16
Sales of treasury stock (in shares)	10,498	482,460	615,340
Common stock repurchased (in shares)	108,900	431,707
Restricted stock units vesting (in shares)		366,400
Restricted stock grants (in shares)	685,872	429,752	514,507
Forfeitures of restricted stock (in shares)	98,350	65,946	31,408