Consolidated Statements 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	$ 109,137	$ 107,315	$ 367,394	$ 191,786
Unrealized (losses) gains on available-for-sale securities
Before tax	(14,141)	(14,563)	(68,555)	81,859
Tax effect	3,767	3,881	18,290	(21,816)
Net of tax	(10,374)	(10,682)	(50,265)	60,043
Reclassification of net gains on available-for-sale securities included in net income
Before tax	350	50	1,144	200
Tax effect	(94)	(14)	(307)	(54)
Net of tax	256	36	837	146
Reclassification of amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale
Before tax	54	54	158	178
Tax effect	(14)	(14)	(42)	(47)
Net of tax	40	40	116	131
Net unrealized (losses) gains on available-for-sale securities	(10,670)	(10,758)	(51,218)	59,766
Unrealized gains (losses) on derivative instruments
Before tax	9,004	10,393	51,008	(31,167)
Tax effect	(2,400)	(2,770)	(13,594)	8,325
Net unrealized gains (losses) on derivative instruments	6,604	7,623	37,414	(22,842)
Foreign currency adjustment
Before tax	(5,858)	3,716	(248)	(3,939)
Tax effect	1,208	(825)	87	852
Net foreign currency adjustment	(4,650)	2,891	(161)	(3,087)
Total other comprehensive (loss) income	(8,716)	(244)	(13,965)	33,837
Comprehensive income	$ 100,421	$ 107,071	$ 353,429	$ 225,623