Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 16,639	$ 14,319	$ 40,896	$ 29,449
Other comprehensive income:
Unrealized gain (loss) on securities, net of tax	2,929	(1,576)	5,722	(758)
Comprehensive income	$ 19,568	$ 12,743	$ 46,618	$ 28,691