CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 12,773	$ 7,644	$ 23,322	$ 16,495
Other comprehensive income:
Unrealized gain/(loss) on securities, net of tax	3,016	(4,060)	6,256	(4,605)
Comprehensive income	$ 15,789	$ 3,584	$ 29,578	$ 11,890