CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 295,045	$ 281,650	$ 245,234
Unrealized (losses) gains on investment securities available-for-sale:
Unrealized holding (losses) gains arising during period	(28,169)	42,868	(12,333)
Reclassification adjustment for net gains included in net income	(7,012)	(439)	(5,628)
Noncredit-related impairment loss on securities		(2,938)	(2,960)
Foreign currency translation adjustments		(900)	(764)
Unrealized gains on other investments	336	31	194
Reclassification adjustment for net gains included in net income	(283)	(13)	(35)
Other comprehensive (loss) income	(35,128)	38,609	(21,526)
COMPREHENSIVE INCOME	$ 259,917	$ 320,259	$ 223,708