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				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Interest Only Strip [Member]	Mar. 31, 2012 Interest Only Strip [Member]	Mar. 31, 2013 Principal Only Strip [Member]	Mar. 31, 2012 Principal Only Strip [Member]
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	$ 1,397,746	$ 1,262,720	$ 1,238,041	$ 11,161	$ 17,124	$ 5,293	$ 7,229
Weighted average life (in years)				3 years 11 months	4 years 0 months	2 years 6 months	3 years 2 months
Annual prepayment rate				18.90%	18.60%	31.80%	24.70%
Annual prepayment rate, Impact on fair value of 10% adverse change				(501)	(758)	(239)	(315)
Annual prepayment rate, Impact on fair value of 20% adverse change				(965)	(1,462)	(503)	(661)
Annual discount rate on residual cash flows				13.30%	13.40%		19.10%
Annual discount rate on servicing cash flows, Impact on fair value of 10% adverse change				(400)	(675)		(245)
Annual discount rate on servicing cash flows, Impact on fair value of 20% adverse change				$ (769)	$ (1,294)		$ (470)