Preferred Stock - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Dec. 05, 2008	Mar. 31, 2013	Mar. 31, 2012
Preferred Stock [Abstract]
Issuance of Preferred stock	7,225
Preferred stock value	$ 7,225
Dividend rate	5.00%
Proceeds from the stock offering		3,000
Deferred dividends totaling		801
Increase in common stockholders equity		4,960
Preferred stock dividend and accretions		$ 0	$ 110