Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 65,756	$ 86,602	$ 92,690
Other comprehensive income:
Unrealized gain (loss) on debt securities, net of tax	(7,482)	8,808	13,043
Comprehensive income	$ 58,274	$ 95,410	$ 105,733