Retirement Plan (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Benefit Plan [Member]
Cost components:
Service cost-benefits earned during the period	$ (142)	$ (126)
Interest cost on projected benefit obligation	(188)	(192)
Expected return on plan assets	228	222
Net amortization and deferral	(96)	(210)
Total net periodic pension cost	(198)	(306)
SERP [Member]
Cost components:
Service cost-benefits earned during the period	(86)	(86)
Interest cost on projected benefit obligation	(108)	(108)
Net amortization and deferral	(144)	(32)
Total net periodic pension cost	$ (338)	$ (226)