Consolidated Statements 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	$ 292,990	$ 355,697	$ 343,166
Unrealized gains (losses) on available-for-sale securities
Before tax	76,464	79,702	(27,408)
Tax effect	(20,378)	(21,361)	7,354
Net of tax	56,086	58,341	(20,054)
Reclassification of net gains on available-for-sale securities included in net income
Before tax	221	899	33
Tax effect	(59)	(241)	(9)
Net of tax	162	658	24
Reclassification of amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale
Before tax	231	479	89
Tax effect	(62)	(131)	(24)
Net of tax	169	348	65
Net unrealized gains (losses) on available-for-sale securities	55,755	57,335	(20,143)
Unrealized losses on derivative instruments
Before tax	(13,591)	(28,685)	(1,160)
Tax effect	3,642	7,687	310
Net unrealized losses on derivative instruments	(9,949)	(20,998)	(850)
Foreign currency translation adjustment
Before tax	5,367	7,483	(12,216)
Tax effect	(1,113)	(1,626)	3,026
Net foreign currency translation adjustment	4,254	5,857	(9,190)
Total other comprehensive income (loss)	50,060	42,194	(30,183)
Comprehensive income	$ 343,050	$ 397,891	$ 312,983