Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 7,590	$ 7,852	$ 28,859	$ 22,213
Other comprehensive income, net of tax:
Unrealized holding gains (losses) arising during the period	38	10	34	(10)
Less: reclassification adjustment for gains included in net income	(11)	0	(12)	0
Net unrealized gains on available-for-sale securities, net of tax	27	10	22	(10)
Comprehensive income	$ 7,617	$ 7,862	$ 28,881	$ 22,203