Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	$ (4,284)	[1]	$ (10,293)	[1]	$ (4,284)	[1]	$ (10,293)	[1]	$ (3,489)	[1]	$ (4,373)	[1]	$ (11,739)	[1]	$ (8,462)	[1]
Other comprehensive income, before reclassifications, net of tax	(770)	[1]	1,210	[1]	(15)	[1]	(2,213)	[1]
Reclassification from Accumulated Other Comprehensive Income, net of tax	(25)	[1]	236	[1]	104	[1]	382	[1]
Other Comprehensive (Loss) Income	(795)	[1]	1,446	[1]	89	[1]	(1,831)	[1]
Unrealized Gains and Losses on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	2,293	[1]	3,086	[1]	2,293	[1]	3,086	[1]	3,145	[1]	2,374	[1]	1,876	[1]	5,625	[1]
Other comprehensive income, before reclassifications, net of tax	(770)	[1]	1,210	[1]	(15)	[1]	(2,213)	[1]
Reclassification from Accumulated Other Comprehensive Income, net of tax	(82)	[1]	0	[1]	(66)	[1]	(326)	[1]
Other Comprehensive (Loss) Income	(852)	[1]	1,210	[1]	(81)	[1]	(2,539)	[1]
Amortization of Net Retirement Plan Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(6,488)	[1]	(13,329)	[1]	(6,488)	[1]	(13,329)	[1]	(6,558)	[1]	(6,697)	[1]	(13,564)	[1]	(14,036)	[1]
Other comprehensive income, before reclassifications, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Reclassification from Accumulated Other Comprehensive Income, net of tax	70	[1]	235	[1]	209	[1]	707	[1]
Other Comprehensive (Loss) Income	70	[1]	235	[1]	209	[1]	707	[1]
(Accretion) Amortization of Net Retirement Plan Prior Service Credit [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(89)	[1]	(50)	[1]	(89)	[1]	(50)	[1]	(76)	[1]	(50)	[1]	(51)	[1]	(51)	[1]
Other comprehensive income, before reclassifications, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Reclassification from Accumulated Other Comprehensive Income, net of tax	(13)	[1]	1	[1]	(39)	[1]	1	[1]
Other Comprehensive (Loss) Income	$ (13)	[1]	$ 1	[1]	$ (39)	[1]	$ 1	[1]

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