Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	[1]	$ 682	$ (1,014)	$ 3,119		$ (159)
Reclassification from Accumulated Other Comprehensive Income, net of tax	[1]	12	99	111		154
Other Comprehensive Income, before Tax		1,143	(1,505)	5,315		(8)
Other Comprehensive Income, Tax		(449)	590	(2,085)		3
Other Comprehensive Income	[1],[2]	694	(915)	3,230		(5)
Unrealized Gains and Losses on Available for Sale Securities [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Before Tax		1,123	(1,668)	5,132		(261)
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit		(441)	654	(2,013)		102
Other comprehensive income, before reclassifications, net of tax	[1]	682	(1,014)	3,119	[2]	(159)
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		(144)	(16)	(144)		(106)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		56	6	56		41
Reclassification from Accumulated Other Comprehensive Income, net of tax	[1]	(88)	(10)	(88)	[2]	(65)
Other Comprehensive Income	[1]	594	(1,024)	3,031		(224)
Amortization of Net Retirement Plan Actuarial Loss [Member]
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	[1]	0	0	0		0
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		168	194	334		387
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		(66)	(76)	(131)		(152)
Reclassification from Accumulated Other Comprehensive Income, net of tax	[1]	102	118	203	[2]	235
Other Comprehensive Income	[1]	102	118	203		235
Accretion of Net Retirement Plan Prior Service Credit [Member]
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	[1]	0	0	0		0
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		(4)	(15)	(7)		(28)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		2	6	3		12
Reclassification from Accumulated Other Comprehensive Income, net of tax	[1]	(2)	(9)	(4)	[2]	(16)
Other Comprehensive Income	[1]	$ (2)	$ (9)	$ (4)		$ (16)

[1] All amounts are net of tax. Amounts in parentheses indicate debits.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost.