Subsequent Events (Details) (USD $)	6 Months Ended			0 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Series B Preferred Stock	Dec. 31, 2012 Series B Preferred Stock	Jul. 02, 2013 Subsequent event Series B Preferred Stock US Treasury
Subsequent Event [Line Items]
Stock redeemed (in shares)				34,044
Aggregate redemption price	$ 479,000			$ 34,044,000
Preferred stock still held by the Treasury (in shares)		68,087	90,782.94	34,043
Remaining liquidation amount				$ 34,000,000