Consolidated Statements of Comprehensive Income - 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	$ 87,990	$ 94,467	$ 331,509	$ 274,522
Unrealized gains and losses on debt securities:
Change in unrealized holding gains and losses, net	(271,079)	(75,717)	(1,202,341)	(198,420)
Less: Reclassification adjustment for gains included in net income		(1,058)		(5,078)
Amortization of net unrealized loss on securities transferred from available-for-sale to held-to-maturity	12,587		25,708
Change in unrealized gains and losses on debt securities	(258,492)	(76,775)	(1,176,633)	(203,498)
Unrealized gains and losses on derivative hedges:
Change in unrealized gains and losses on derivative hedges, net	3,321	432	12,438	3,513
Less: Reclassification adjustment for gains included in net income	(1,470)	(831)	(3,411)	(2,550)
Change in unrealized gains and losses on derivative hedges	1,851	(399)	9,027	963
Other comprehensive loss, before tax	(256,641)	(77,174)	(1,167,606)	(202,535)
Income tax benefit	62,184	18,374	282,032	48,502
Other comprehensive loss	(194,457)	(58,800)	(885,574)	(154,033)
Comprehensive (loss) income	$ (106,467)	$ 35,667	$ (554,065)	$ 120,489