Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 9,771	$ 20,888	$ 36,826	$ 63,985
Other comprehensive income/(loss), net of tax:
Changes in unrealized gains/(losses) on available-for-sale securities	[1],[2]	11,449	(3,349)	10,421	3,597
Amortization of losses of securities transferred to held-to-maturity from available-for-sale	[1]	800	1,545	1,309	2,276
Changes in unrealized gains/(losses) on cash flow hedging instruments	[1],[3]	(3,427)	713	(8,407)	487
Foreign currency translation adjustment	[1]	(5,093)	5,293	(7,279)	1,315
Total other comprehensive income/(loss), net of tax		3,729	4,202	(3,956)	7,675
Comprehensive income		13,500	25,090	32,870	71,660
Changes in unrealized gains (losses) on available-for-sale securities, tax		2,300	2,600	(2,500)	4,800
Reclassifications to earnings of realized gains on available-for-sale securities		0	1,900	0	1,900
Reclassifications to earnings of losses on cash flow hedging instruments		$ 1,500	$ 1,000	$ 2,900	$ 2,200

[1] Net of tax expense of $2.3 million $2.6 million for the three months ended June 30, 2016 and 2015, respectively. Net of tax benefit of $2.5 million and tax expense of $4.8 million for the six months ended June 30, 2016 and 2015, respectively.

[2] There were no reclassifications to earnings during the three and six months ended June 30, 2016. Amounts are net of reclassifications to earnings of realized gains of $1.9 million and $1.9 million for the three and six months ended June 30, 2015, respectively.

[3] Amounts are net of reclassifications to earnings of losses of $1.5 million and $1.0 million for the three months ended June 30, 2016 and 2015, respectively. Amounts are net of reclassifications to earnings of losses of $2.9 million and $2.2 million for the six months ended June 30, 2016 and 2015, respectively.