Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividends on preferred stock (in dollars per share)	$ 16.25	$ 16.25
Dividends on common stock (in dollars per share)	$ 0.04	$ 0.04
Sale of treasury stock (in shares)	1,822	2,710
Restricted stock grants (in shares)	521,784	685,872
Forfeitures of restricted stock (in shares)	2,910	3,390