Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 111,514	$ 109,597	$ 304,927	$ 290,464
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) on investment securities	(14,159)	43,484	63,937	72,529
Noncredit-related impairment losses on securities not expected to be sold	(867)	(703)	(13,751)	(16,006)
Reclassification to earnings for realized net fixed income securities losses	(976)	(1,881)	(2,301)	(5,868)
Reclassification to earnings for net credit-related impairment losses on investment securities	5,588	1,690	14,136	12,296
Accretion of securities with noncredit-related impairment losses not expected to be sold	285	192	880	724
Net unrealized holding gains (losses) on derivative instruments	239	48	236	225
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	(57)	(1,421)	(1,483)	(6,554)
Other comprehensive income (loss)	(9,947)	41,409	61,654	57,346
Comprehensive income	101,567	151,006	366,581	347,810
Comprehensive loss applicable to noncontrolling interests	0	(254)	(336)	(800)
Comprehensive income applicable to controlling interest	$ 101,567	$ 151,260	$ 366,917	$ 348,610