Comprehensive Income Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Net of Tax	$ 3,500	$ (2,246)	$ 879
Reclassification from Accumulated Other Comprehensive Income	589	479	(1,151)
Other Comprehensive Income (Loss), before Tax	6,772	(2,925)	(452)
Other Comprehensive Income (Loss), Tax	(2,683)	1,158	180
Other Comprehensive (Loss) Income	4,089	(1,767)	(272)
Unrealized Gains and Losses on Available for Sale Securities
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(4,843)	(1,094)	7,850
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	1,918	433	(3,109)
Other Comprehensive Income (Loss), Net of Tax	(2,925)	(661)	4,741
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(540)	(865)	(2,795)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	214	343	1,107
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]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	10,640	(2,218)	(6,129)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	(4,215)	878	2,428
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, Current Period, before Tax	1,513	1,677	996
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	(599)	(664)	(394)
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]
Schedule of Comprehensive Income [Line Items]
Net Prior Service Cost Arising During the Period		(405)	(266)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax		160	105
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Prior Service (Cost) Credit	0	(245)	(161)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	(20)	(108)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	(1)	8	43
Reclassification from Accumulated Other Comprehensive Income	1	(12)	(65)
Other Comprehensive (Loss) Income	$ 1	$ (257)	$ (226)