Loan Sales And Securitizations (Schedule Of Sensitivity Of Fair Value Of Other Retained Interests To Immediate 10 Percent And 20 Percent Adverse Changes Assumptions) (Details) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2012 Interest Only Trading Securities [Member] Y	Jun. 30, 2011 Interest Only Trading Securities [Member] Y	Jun. 30, 2012 Certificated Principal Only [Member] Y	Jun. 30, 2011 Certificated Principal Only [Member] Y
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of retained interests	$ 1,361,717	$ 988,217	$ 1,196,380	$ 14,669	$ 22,643	$ 5,667	$ 8,775
Weighted average life (in years)				3.9	4.5	2.6	4.9
Annual prepayment rate				19.20%	17.10%	32.00%	25.60%
Annual prepayment rate, Impact on fair value of 10% adverse change				(678)	(978)	(321)	(303)
Annual prepayment rate, Impact on fair value of 20% adverse change				(1,304)	(1,893)	(673)	(594)
Annual discount rate on residual cash flows				13.30%	13.10%	82.20%	18.70%
Annual discount rate on servicing cash flows, Impact on fair value of 10% adverse change				(548)	(926)	(253)	(439)
Annual discount rate on servicing cash flows, Impact on fair value of 20% adverse change				$ (1,053)	$ (1,773)	$ (482)	$ (872)