Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 21,795	$ 22,179	$ 21,933
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)
Comprehensive Income (Loss), Net of Tax	25,884	20,412	21,661
Unrealized Gains and Losses on Available for Sale Securities
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]
Reclassification from Accumulated Other Comprehensive Income	914	1,013	602
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Unamortized Gain (Loss)	6,425	(1,340)	(3,701)
Other Comprehensive (Loss) Income	7,339	(327)	(3,099)
Defined Benefit Plans, Net Prior Service Cost (Credit) [Member]
Reclassification from Accumulated Other Comprehensive Income	1	(12)	(65)
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Prior Service (Cost) Credit	0	(245)	(161)
Other Comprehensive (Loss) Income	$ 1	$ (257)	$ (226)