CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 14,896	$ 13,005	$ 41,242	$ 37,287
Other comprehensive (loss) income, net of tax:
Change in unrealized appreciation (depreciation) of available-for-sale securities	1,853	3,979	(16,881)	5,673
Reclassification adjustment for realized losses (gains) included in net income	28	2	28	(275)
Income tax effect	(706)	(1,522)	6,327	(2,063)
Other comprehensive income (loss), net of tax	1,175	2,459	(10,526)	3,335
Comprehensive income	$ 16,071	$ 15,464	$ 30,716	$ 40,622