Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	$ (4,373)	$ (8,462)	$ (6,695)	$ (6,423)
Other Comprehensive Income (Loss), Net of Tax	3,500	(2,246)	879
Reclassification from Accumulated Other Comprehensive Income	589	479	(1,151)
Other Comprehensive (Loss) Income	4,089	(1,767)	(272)
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	2,374	5,625	6,808	3,755
Other Comprehensive Income (Loss), Net of Tax	(2,925)	(661)	4,741
Reclassification from Accumulated Other Comprehensive Income	(326)	(522)	(1,688)
Other Comprehensive (Loss) Income	(3,251)	(1,183)	3,053
Defined Benefit Plans, Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(6,697)	(14,036)	(13,709)	(10,610)
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Unamortized Gain (Loss)	6,425	(1,340)	(3,701)
Reclassification from Accumulated Other Comprehensive Income	914	1,013	602
Other Comprehensive (Loss) Income	7,339	(327)	(3,099)
Defined Benefit Plans, Net Prior Service Cost (Credit) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(50)	(51)	206	432
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Prior Service (Cost) Credit	0	(245)	(161)
Reclassification from Accumulated Other Comprehensive Income	1	(12)	(65)
Other Comprehensive (Loss) Income	$ 1	$ (257)	$ (226)