Consolidated Statement 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 Comprehensive Income [Abstract]
Net income	$ 225,449	$ 159,537	$ 655,185	$ 403,713
Other comprehensive income (loss), net of tax:
Net changes in unrealized (losses) gains on AFS debt securities	(41,178)	4,634	(101,577)	49,903
Net changes in unrealized gains (losses) on cash flow hedges	51	87	551	(1,246)
Foreign currency translation adjustments	(1,752)	5,459	(867)	3,065
Other comprehensive (loss) income	(42,879)	10,180	(101,893)	51,722
COMPREHENSIVE INCOME	$ 182,570	$ 169,717	$ 553,292	$ 455,435