Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 3,647	$ 2,679	$ 10,516	$ 8,102
Other Comprehensive Income [Abstract]
Unrealized gains on available-for-sale securities, net of taxes	1,669	1,860	2,813	6,004
Other Comprehensive Income Loss Reclassification Adjustment For Sale Or Writedown Of Securities Included In Net Income Net Of Tax	(67)	185	(569)	105
Unrealized gains (losses) on available-for-sale securities for which a portion of an other-than-temporary impairment has been recognized in income, net of taxes	0	0	0	0
Total other comprehensive income	1,602	2,045	2,244	6,109
Comprehensive income	$ 5,249	$ 4,724	$ 12,760	$ 14,211