Comprehensive Income Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Schedule of Comprehensive Income [Line Items]
Other comprehensive income (loss), before reclassifications, net of tax	$ 1,210	[1]	$ 411	[1]	$ (2,213)	[1]	$ 758	[1]
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	236	[1]	185	[1]	382	[1]	244	[1]
Other Comprehensive Income (Loss), before Tax	2,394		985		(3,030)		1,659
Other Comprehensive Income (Loss), Tax	(948)		(389)		1,199		(657)
Other Comprehensive (Loss) Income	1,446	[1]	596	[1]	(1,831)	[1]	1,002	[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	2,003		679		(3,664)		1,256
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	(793)		(268)		1,451		(498)
Other comprehensive income (loss), before reclassifications, net of tax	1,210	[1]	411	[1]	(2,213)	[1]	758	[1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	0		(64)		(540)		(709)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	0		25		214		281
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	0	[1]	(39)	[1]	(326)	[1]	(428)	[1]
Other Comprehensive (Loss) Income	1,210	[1]	372	[1]	(2,539)	[1]	330	[1]
Amortization of Net Retirement Plan Actuarial Loss [Member]
Schedule of Comprehensive Income [Line Items]
Other comprehensive income (loss), before reclassifications, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	390		377		1,173		1,134
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	(155)		(149)		(466)		(449)
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	235	[1]	228	[1]	707	[1]	685	[1]
Other Comprehensive (Loss) Income	235	[1]	228	[1]	707	[1]	685	[1]
Accretion of Net Retirement Plan Prior Service Credit [Member]
Schedule of Comprehensive Income [Line Items]
Other comprehensive income (loss), before reclassifications, net of tax	0	[1]	0	[1]	0	[1]	0	[1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	1		(7)		1		(22)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	0		3		0		9
Reclassification from Accumulated Other Comprehensive Income, current period, net of tax	1	[1]	(4)	[1]	1	[1]	(13)	[1]
Other Comprehensive (Loss) Income	$ 1	[1]	$ (4)	[1]	$ 1	[1]	$ (13)	[1]

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