Accumulated Other Comprehensive Income Amount Reclassified from 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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ 774		$ 598		$ 1,137		$ 1,014
Total reclassifications for the period					(246)	[1]	(190)	[1]
Net Unrealized Gains (Losses) on Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period					(246)	[1]	(190)	[1]
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	(215)		(98)		(246)		(190)
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	(326)	[2]	(148)	[2]	(373)	[2]	(288)	[2]
Income tax expense	111	[2]	50	[2]	127	[2]	98	[2]
Net of tax	$ (215)	[2]	$ (98)	[2]	$ (246)	[2]	$ (190)	[2]

[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."