Comprehensive Income Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	$ 745	[1]	$ 241	[1]
Reclassification from Accumulated Other Comprehensive Income, net of tax	165	[1]	57	[1]
Other Comprehensive Income, before Tax	1,494		493
Other Comprehensive Income, Tax	(584)		(195)
Other Comprehensive Income	910	[1]	298	[1]
Unrealized Gains and Losses on Available for Sale Securities [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Before Tax	1,225		399
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	(480)		(158)
Other comprehensive income, before reclassifications, net of tax	745		241
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	90		0
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	(35)		0
Reclassification from Accumulated Other Comprehensive Income, net of tax	55		0
Other Comprehensive Income	800	[1]	241	[1]
Amortization of Net Retirement Plan Actuarial Loss [Member]
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	0	[1]	0	[1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	192		116
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	(75)		(46)
Reclassification from Accumulated Other Comprehensive Income, net of tax	117		70
Other Comprehensive Income	117	[1]	70	[1]
Accretion of Net Retirement Plan Prior Service Credit [Member]
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	0	[1]	0	[1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	(13)		(22)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	6		9
Reclassification from Accumulated Other Comprehensive Income, net of tax	(7)		(13)
Other Comprehensive Income	$ (7)	[1]	$ (13)	[1]

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