Consolidated Statement of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 204,994	$ 144,824
Other comprehensive (loss) income, net of tax:
Net changes in unrealized (losses) gains on AFS debt securities	(133,448)	27,453
Net changes in unrealized gains on cash flow hedges	432	0
Foreign currency translation adjustments	(1,349)	(2,164)
Other comprehensive (loss) income	(134,365)	25,289
COMPREHENSIVE INCOME	$ 70,629	$ 170,113