Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 11,361	$ 19,136	$ 34,824	$ 62,215
Other comprehensive income:
Unrealized loss on debt securities, net of tax	(11,090)	(1,876)	(33,501)	(6,033)
Comprehensive income	$ 271	$ 17,260	$ 1,323	$ 56,182