Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	[1]	$ (1,014)	$ 514	$ (159)	$ 755
Reclassification from Accumulated Other Comprehensive Income, net of tax	[1]	99	72	154	129
Other Comprehensive Income, before Tax		(1,505)	970	(8)	1,463
Other Comprehensive Income, Tax		590	(384)
Other Comprehensive Income	[1]	(915)	586	(5)	884
Unrealized Gains and Losses on Available for Sale Securities [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Before Tax		(1,668)	850	(261)	1,249
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit		654	(336)
Other comprehensive income, before reclassifications, net of tax		(1,014)	514	(159)	755
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		(16)	27	(106)	27
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		6	(11)
Reclassification from Accumulated Other Comprehensive Income, net of tax		(10)	16	(65)	16
Other Comprehensive Income	[1]	(1,024)	530	(224)	771
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		194	114	387	230
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		(76)	(45)
Reclassification from Accumulated Other Comprehensive Income, net of tax		118	69	235	139
Other Comprehensive Income	[1]	118	69	235	139
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		(15)	(21)	(28)	(43)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		6	8
Reclassification from Accumulated Other Comprehensive Income, net of tax		(9)	(13)	(16)	(26)
Other Comprehensive Income	[1]	$ (9)	$ (13)	$ (16)	$ (26)

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