Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 26,565	$ 16,344	$ 65,346	$ 27,870
Unrealized gain on securities:
Unrealized holding (loss) gain arising during period	(3,568)	1,947	(11,877)	13,378
Less: reclassification adjustment for net gain included in net income			(99)	(15,712)
Income tax benefit (expense) related to items of other comprehensive income	1,070	(561)	3,543	673
Other comprehensive income (loss), net of tax	(2,498)	1,386	(8,433)	(1,661)
Comprehensive income	$ 24,067	$ 17,730	$ 56,913	$ 26,209