Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 87,287	$ 52,811	$ 176,048	$ 118,323
Other comprehensive income/(loss), net of tax:
Changes in unrealized gains/(losses) on available-for-sale securities	[1],[2],[3]	(11,856)	3,770	(24,927)	7,547
Amortization of losses of securities transferred to held-to-maturity from available-for-sale	[1],[2]		385		909
Changes in unrealized gains/(losses) on cash flow hedging instruments	[1],[2],[4]	712	(518)	3,418	515
Foreign currency translation adjustment	[1],[2]	(5,834)	2,240	(2,098)	4,534
Total other comprehensive income/(loss), net of tax	[1],[2]	(16,978)	5,877	(23,607)	13,505
Comprehensive income		$ 70,309	$ 58,688	$ 152,441	$ 131,828

[1] Net of tax benefit of $6.0 million and tax expense of $3.7 million for the three months ended June 30, 2018 and 2017, respectively. Net of tax benefit of $8.3 million and tax expense of $8.5 million for the six months ended June 30, 2018 and 2017, respectively.

[2] The adoption of ASU 2018-02 on January 1, 2018 resulted in a reclassification of $3.0 million to retained earnings related to cash flow hedges and investment portfolio risk. The reclassification is reflected in the activity for the six months ended June 30, 2018. See Note 2 for further details.

[3] There were no reclassifications to earnings during the three and six months ended June 30, 2018 and 2017, respectively.

[4] Amounts are net of reclassifications to earnings of gains of $1.2 million and losses of $0.6 million for the three months ended June 30, 2018 and 2017, respectively. Amounts are net of reclassifications to earnings of gains of $1.8 million and losses of $1.5 million for the six months ended June 30, 2018 and 2017, respectively.