Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 53,115	$ 38,355	$ 152,267	$ 121,238
Unrealized gains (losses) on securities
Before tax	2,525	31,268	33,669	4,144
Tax effect	(993)	(12,273)	(13,225)	(1,645)
Net of tax	1,532	18,995	20,444	2,499
Reclassification of net gains (losses) included in net income
Before tax	3,305	(98)	6,070	402
Tax effect	(1,300)	38	(2,386)	(158)
Net of tax	2,005	(60)	3,684	244
Reclassification of amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale
Before tax	(3,781)	0	(11,038)	0
Tax effect	1,486	0	4,331	0
Net of tax	(2,295)	0	(6,707)	0
Net unrealized gains (losses) on securities	1,822	19,055	23,467	2,255
Unrealized gains (losses) on derivative instruments
Before tax	2,773	99	2,728	(247)
Tax effect	(1,090)	(39)	(1,072)	97
Net unrealized gains (losses) on derivative instruments	1,683	60	1,656	(150)
Foreign currency adjustment
Before tax	(2,237)	(8,682)	6,966	(18,900)
Tax effect	593	2,345	(1,960)	5,034
Net foreign currency adjustment	(1,644)	(6,337)	5,006	(13,866)
Total other comprehensive income (loss)	1,861	12,778	30,129	(11,761)
Comprehensive income	$ 54,976	$ 51,133	$ 182,396	$ 109,477