Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 52,811	$ 9,771	$ 118,323	$ 36,826
Other comprehensive income/(loss), net of tax:
Changes in unrealized gains on available-for-sale securities	[1],[2]	3,770	11,449	7,547	10,421
Amortization of losses of securities transferred to held-to-maturity from available-for-sale	[1]	385	800	909	1,309
Changes in unrealized gains/(losses) on cash flow hedging instruments	[1],[3]	(518)	(3,427)	515	(8,407)
Foreign currency translation adjustment	[1]	2,240	(5,093)	4,534	(7,279)
Total other comprehensive income/(loss), net of tax	[1]	5,877	3,729	13,505	(3,956)
Comprehensive income		$ 58,688	$ 13,500	$ 131,828	$ 32,870

[1] Net of tax expense of $3.7 million and $2.3 million for the three months ended June 30, 2017 and 2016, respectively. Net of tax expense of $8.5 million and tax benefit of $2.5 million for the six months ended June 30, 2017 and 2016, respectively.

[2] There were no reclassifications to earnings during the three and six months ended June 30, 2017 and 2016, respectively.

[3] Amounts are net of reclassifications to earnings of losses of $0.6 million and $1.5 million for the three months ended June 30, 2017 and 2016, respectively. Amounts are net of reclassifications to earnings of losses of $1.5 million and $2.9 million for the six months ended June 30, 2017 and 2016, respectively.