Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 19,312	$ 10,800
Other comprehensive income:
Unrealized gain (loss) on debt securities, net of tax	(5,048)	1,484
Comprehensive income	$ 14,264	$ 12,284