Accumulated 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
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning, balance	$ 2,150	$ 7,121	$ 7,597	$ 6,830
Net unrealized losses on securities available for sale, net of tax	126	1,558	(5,192)	1,953
Reclassification adjustment for gains on securities, net of tax	(3)	0	(132)	(104)
Ending, balance	2,273	8,679	2,273	8,679
Net unrealized losses on securities available for sale, tax	67	838	(2,796)	1,051
Reclassification adjustment for gains on securities, tax	(1)	0	(71)	(56)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	4	0	203	160
Income Taxes	1,562	1,338	4,992	4,685
Net income	4,243	3,639	12,604	12,088
Net Unrealized (Loss) on Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning, balance	4,353	9,123	9,800	8,832
Net unrealized losses on securities available for sale, net of tax	126	1,558	(5,192)	1,953
Reclassification adjustment for gains on securities, net of tax	(3)	0	(132)	(104)
Ending, balance	4,476	10,681	4,476	10,681
Net Unrealized (Loss) on Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	4		203
Income Taxes	(1)		(71)
Net income	3		132
Adjustment related to Pension Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning, balance	(2,203)	(2,002)	(2,203)	(2,002)
Net unrealized losses on securities available for sale, net of tax	0	0	0	0
Reclassification adjustment for gains on securities, net of tax	0	0	0	0
Ending, balance	$ (2,203)	$ (2,002)	$ (2,203)	$ (2,002)