Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net periodic benefit cost for both the Executive Retirement Plan and the Outside Director Plan
Service cost	$ 77	$ 69	$ 51
Interest cost	725	856	933
Effect of settlement			(243)
Amortization of prior service cost	(723)
Amortization of net gain/loss	990	929	671
Total	1,069	1,854	1,412
Net loss (gain) recognized in other comprehensive income	(1,240)	(1,937)	676
Total recognized in net periodic benefit cost (gain) and accumulated other comprehensive loss	$ (171)	$ (83)	$ 2,088