CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 71,110	$ 62,432	$ 209,750	$ 179,028
Unrealized gain on investment securities available-for-sale:
Unrealized holding gains/(losses) arising during period	15,355	(24,015)	36,627	(1,446)
Reclassification adjustment for net gains included in net income	(54)	(1,850)	(375)	(3,957)
Noncredit-related impairment loss on securities			(2,938)	(2,953)
Foreign currency translation adjustments	(900)	57	(900)	(736)
Unrealized gain (loss) on other asset investment	5	(217)	9	(89)
Other comprehensive income (loss)	14,406	(26,025)	32,423	(9,181)
COMPREHENSIVE INCOME	$ 85,516	$ 36,407	$ 242,173	$ 169,847