Accumulated Other Comprehensive Income Amount Reclassified from 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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ 491		$ 565		$ 1,628		$ 1,578
Total reclassifications for the period					(262)	[1]	(298)	[1]
Net Unrealized Gains (Losses) on Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period					(262)	[1]	(298)	[1]
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	(15)		(108)		(262)		(298)
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Gain on securities available for sale	(23)	[2]	(164)	[2]	(397)	[2]	(452)	[2]
Income tax expense	8	[2]	56	[2]	135	[2]	154	[2]
Net of tax	$ (15)		$ (108)		$ (262)		$ (298)

[1] All amounts shown are net of applicable income taxes using an income tax rate of 34%.

[2] For more information related to unrealized gains on securities available for sale, see Note 3, "Securities."