Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of changes in Benefit Obligation
Benefit obligation at beginning of year	$ 1,981	$ 2,778
Service cost
Interest cost	(95)	54	186
Actuarial gain	(23)	(690)
Benefits paid	(9)	(161)
Benefit obligation at end of the year	1,854	1,981	2,778
Funded status of the plan	$ (1,854)	$ (1,981)