Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Comprehensive Income [Line Items]
Other comprehensive income, before reclassifications, net of tax	[1]	$ 543	$ (770)	$ 384	$ (15)
Reclassification from Accumulated Other Comprehensive Income, net of tax	[1]	108	(25)	262	104
Other Comprehensive Income, before Tax		1,071	(1,317)	1,063	146
Other Comprehensive Income, Tax		(420)	522
Other Comprehensive Income	[1]	651	(795)	646	89
Unrealized Gains and Losses on Available for Sale Securities [Member]
Schedule of Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Before Tax		892	(1,274)	631	(25)
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit		(349)	504
Other comprehensive income, before reclassifications, net of tax		543	(770)	384	(15)
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax		0	(137)	(106)	(110)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		0	55
Reclassification from Accumulated Other Comprehensive Income, net of tax		0	(82)	(65)	(66)
Other Comprehensive Income	[1]	543	(852)	319	(81)
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		192	116	579	346
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		(75)	(46)
Reclassification from Accumulated Other Comprehensive Income, net of tax		117	70	352	209
Other Comprehensive Income	[1]	117	70	352	209
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		(13)	(22)	(41)	(65)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit		4	9
Reclassification from Accumulated Other Comprehensive Income, net of tax		(9)	(13)	(25)	(39)
Other Comprehensive Income	[1]	$ (9)	$ (13)	$ (25)	$ (39)

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