Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 567,797	$ 674,035	$ 703,701
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains (losses) on AFS debt securities	54,666	43,402	(8,652)
Net changes in unrealized losses on cash flow hedges	(1,230)	0	0
Foreign currency translation adjustments	9,297	(3,636)	(5,732)
Other comprehensive income (loss)	62,733	39,766	(14,384)
COMPREHENSIVE INCOME	$ 630,530	$ 713,801	$ 689,317