Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 206,875	$ 156,749	$ 151,398
Unrealized (losses) gains on securities
Before tax	(28,932)	(13,176)	72,488
Tax effect	11,378	5,153	(28,660)
Net of tax	(17,554)	(8,023)	43,828
Reclassification of net gains (losses) included in net income
Before tax	7,645	323	(504)
Tax effect	(3,004)	(127)	200
Net of tax	4,641	196	(304)
Reclassification of amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale
Before tax	(17,386)	(128)	0
Tax effect	6,826	50	0
Net of tax	(10,560)	(78)	0
Net unrealized (losses) gains on securities	(11,635)	(8,141)	44,132
Unrealized gains (losses) on derivative instruments
Before tax	10,473	533	(91)
Tax effect	(4,115)	(209)	36
Net unrealized gains (losses) on derivative instruments	6,358	324	(55)
Foreign currency translation adjustment
Before tax	3,737	(24,001)	(24,346)
Tax effect	(1,080)	6,442	5,973
Net foreign currency translation adjustment	2,657	(17,559)	(18,373)
Total other comprehensive (loss) income	(2,620)	(25,376)	25,704
Comprehensive income	$ 204,255	$ 131,373	$ 177,102