CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 83,988		$ 74,015		$ 160,729		$ 146,106
Unrealized gains on investment securities available-for-sale:
Net unrealized holding gains (losses) arising during period	14,895		(24,770)		30,317		(20,029)
Reclassification adjustment for net gains included in net income	(389)	[1]	(3,100)	[1]	(2,372)	[1]	(6,335)	[1]
Net unrealized (losses) gains on other investments	(4)		7		(21)		17
Other comprehensive income (loss)	14,502		(27,863)		27,924		(26,347)
COMPREHENSIVE INCOME	$ 98,490		$ 46,152		$ 188,653		$ 119,759

[1] The pretax amount is reported in net gains on sales of investment securities in the consolidated statements of operations.