Employee Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Recognized net periodic benefit cost and other comprehensive income
Service cost	$ 88	$ 49	$ 34
Interest cost	69	56	43
Net amortization of transition obligation and actuarial loss	41	11	3
Net periodic benefit cost	198	116	80
Net loss	578	758	380
Amortization of loss	(34)	(4)	4
Transition obligation	(7)	(14)	(7)
Total recognized in other comprehensive income	537	747	377
Total recognized in net periodic benefit cost and other comprehensive income	$ 735	$ 863	$ 457