Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 23,767	$ 23,948	$ 43,079	$ 34,748
Other comprehensive income:
Unrealized gain (loss) on debt securities, net of tax	891	5,483	(4,157)	6,967
Comprehensive income	$ 24,658	$ 29,431	$ 38,922	$ 41,715