Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 34,509	$ 39,427
Other comprehensive loss before tax:
Net unrealized loss on investment securities arising during the period	(50,594)	(16,288)
Other comprehensive loss before tax	(50,594)	(16,288)
Income tax benefit	12,142	3,909
Other comprehensive loss, net of tax	(38,452)	(12,379)
Total comprehensive (loss) income	$ (3,943)	$ 27,048