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 Income And Comprehensive Income [Abstract]
Net income		$ 17,814	$ 17,179	$ 54,640	$ 81,164
Other comprehensive income/(loss), net of tax:
Changes in unrealized gains/(losses) on available-for-sale securities	[1],[2]	4,494	(1,827)	14,915	1,770
Amortization of losses of securities transferred to held-to-maturity from available-for-sale	[1]	1,633	1,216	2,942	3,491
Changes in unrealized gains/(losses) on cash flow hedging instruments	[1],[3]	4,279	(289)	(4,128)	199
Foreign currency translation adjustment	[1]	(1,036)	(2,935)	(8,315)	(1,620)
Total other comprehensive income/(loss), net of tax		9,370	(3,835)	5,414	3,840
Comprehensive income		27,184	13,344	60,054	85,004
Changes in unrealized gains (losses) on available-for-sale securities, tax		5,800	2,400	3,400	2,400
Reclassifications to earnings of realized gains on available-for-sale securities		0	200	0	2,100
Reclassifications to earnings of losses on cash flow hedging instruments		$ 1,400	$ 900	$ 4,300	$ 3,100

[1] Net of tax expense of $5.8 million and $2.4 million for the three months ended September 30, 2016 and 2015, respectively. Net of tax expense of $3.4 million and tax expense of $2.4 million for the nine months ended September 30, 2016 and 2015, respectively.

[2] There were no reclassifications to earnings during the three and nine months ended September 30, 2016. Amounts are net of reclassifications to earnings of realized gains of $0.2 million and $2.1 million for the three and nine months ended September 30, 2015, respectively.

[3] Amounts are net of reclassifications to earnings of losses of $1.4 million and $0.9 million for the three months ended September 30, 2016 and 2015, respectively. Amounts are net of reclassifications to earnings of losses of $4.3 million and $3.1 million for the nine months ended September 30, 2016 and 2015, respectively.