Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal:
Current	$ 903	$ 6,812	$ 169
Deferred	1,092	(1,233)	2,055
Federal	1,995	5,579	2,224
Current
Current	67	2,133	112
Deferred	661	(345)	516
State	728	1,788	628
Total provision	$ 2,723	$ 7,367	$ 2,852