Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 18,806	$ 19,701	$ 16,956	$ 16,169	$ 649	$ 16,577	$ 15,481	$ 13,524	$ 71,632	$ 46,231	$ 77,865
Other comprehensive income:
Unrealized gain (loss) on securities, net of tax									(4,243)	4,104	(3,079)
Comprehensive income	$ 22,176	$ 17,582	$ 17,109	$ 10,321	$ 1,228	$ 17,194	$ 17,437	$ 14,476	$ 67,389	$ 50,335	$ 74,786