Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in plan assets
Plan assets at fair value at December 31	$ 16,731	$ 14,894
Pension Benefits [Member]
Change in benefit obligation
Benefit obligation at January 1	24,417	22,568
Service cost	198	191	316
Interest cost	882	934	1,015
Actuarial (gain) loss	(2,795)	1,951
Assumed administrative expenses	(198)	(190)
Benefits paid	(1,013)	(1,037)
Benefit obligation at December 31	21,491	24,417	22,568
Change in plan assets
Plan assets at January 1	14,894	13,278
Actual return on plan assets	2,313	1,723
Administrative expenses	(198)	(191)
Employer contributions	735	1,121
Benefits paid	(1,013)	(1,037)
Plan assets at fair value at December 31	16,731	14,894	13,278
Funded status
Benefit obligation in excess of plan assets at December 31	(4,760)	(9,523)
Postretirement Benefits [Member]
Change in benefit obligation
Benefit obligation at January 1	111	106
Service cost	1	1	1
Interest cost	4	4	5
Plan amendments	(31)
Actuarial (gain) loss	(6)	9
Benefits paid	(4)	(9)
Benefit obligation at December 31	75	111	106
Change in plan assets
Benefits paid	(4)	(9)
Funded status
Benefit obligation in excess of plan assets at December 31	$ (75)	$ (111)