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	$ 105,963	$ 92,643
Unrealized gains and losses on debt securities:
Change in unrealized holding gains and losses, net	(622,910)	(199,038)
Less: Reclassification adjustment for gains included in net income		(2,720)
Amortization of net unrealized loss on securities transferred from available-for-sale to held-to-maturity	582
Change in unrealized gains and losses on debt securities during the period	(622,328)	(201,758)
Unrealized gains and losses on derivative hedges:
Change in unrealized gains and losses on derivative hedges	4,680	6,503
Less: Reclassification adjustment for gains included in net income	(851)	(842)
Change in unrealized gains and losses on derivative hedges	3,829	5,661
Other comprehensive loss, before tax	(618,499)	(196,097)
Income tax benefit	149,057	46,954
Other comprehensive loss	(469,442)	(149,143)
Comprehensive loss	$ (363,479)	$ (56,500)