CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Cumulative dividends declared per common share (in dollars per share)	$ 0.15	$ 0.01	$ 0.39	$ 0.03	$ 0.04