CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 7,644	$ 3,445	$ 16,495	$ 13,006
Other comprehensive income:
Unrealized gain/(loss) on securities, net of tax	(4,060)	503	(4,605)	450
Comprehensive income	$ 3,584	$ 3,948	$ 11,890	$ 13,456