Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 83,026	$ 91,464	$ 193,413	$ 180,867
Other comprehensive income (loss), net of tax:
Unrealized holding gains on investment securities	29,300	6,431	78,096	29,045
Noncredit-related impairment losses on securities not expected to be sold	(130)	(10,323)	(12,884)	(15,303)
Reclassification to earnings for realized net fixed income securities losses (gains)	712	(3,481)	(1,325)	(3,987)
Reclassification to earnings for net credit-related impairment losses on investment securities	2,549	4,302	8,548	10,606
Accretion of securities with noncredit-related impairment losses not expected to be sold	386	367	595	532
Net unrealized holding gains (losses) on derivative instruments	(1)	56	(3)	177
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	(469)	(1,932)	(1,426)	(5,133)
Other comprehensive income	32,347	(4,580)	71,601	15,937
Comprehensive income	115,373	86,884	265,014	196,804
Comprehensive loss applicable to noncontrolling interests	0	(273)	(336)	(546)
Comprehensive income applicable to controlling interest	$ 115,373	$ 87,157	$ 265,350	$ 197,350