Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning, balance	$ 6,895	$ 6,390	$ 7,597	$ 6,830
Net unrealized losses on securities available for sale, net of tax	(4,745)	835	(5,318)	395
Reclassification adjustment for gains on securities, net of tax		(104)	(129)	(104)
Ending, balance	2,150	7,121	2,150	7,121
Net unrealized losses on securities available for sale, tax	(2,554)	450	(2,863)	213
Reclassification adjustment for gains on securities, tax	(1)	(56)	(70)	(56)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	1	160	199	160
Income Taxes	1,741	1,776	3,430	3,347
Net income	4,210	4,274	8,361	8,449
Net Unrealized (Loss) on Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning, balance	9,098	8,392	9,800	8,832
Net unrealized losses on securities available for sale, net of tax	(4,745)	835	(5,318)	395
Reclassification adjustment for gains on securities, net of tax		(104)	(129)	(104)
Ending, balance	4,353	9,123	4,353	9,123
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	1		199
Income Taxes	(1)		(70)
Net income	0		129
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
Ending, balance	$ (2,203)	$ (2,002)	$ (2,203)	$ (2,002)