Accumulated Other Comprehensive Income Changes in Accumulated OCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Changes in Accumulated Other Comprehensive Income) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 461	$ 222
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	272
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(33)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	$ 239