Contingencies And Other Disclosures (Narrative II) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended							3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jul. 31, 2012	Feb. 29, 2012	Mar. 31, 2011	Jun. 30, 2012 Visa Class B Shares [Member]	Mar. 31, 2008 Visa Class B Shares [Member]	Mar. 31, 2011 Visa Interest [Member]	Jun. 30, 2012 Visa Interest [Member]	Jun. 30, 2011 Visa Interest [Member]
Loss Contingencies [Line Items]
Number of Visa Class B shares						1.1	2.4
Historical cost						$ 0
Estimated conversion ratio			42.00%	43.00%
Derivative liability	3,500,000	1,300,000							3,500,000	1,300,000
Unpaid principal balance of servicing portfolio	21,000,000,000
Additional amount deposited into escrow account by Visa			150,000,000		400,000,000
Reduction in contingent liability								3,300,000
Contingent liability								1,400,000
Cash payment to counterparty		700,000
Recognized servicing and P&I advances	318,900,000	281,300,000
Amount disputed related to tax service contracts for transfers of subservicers	5,800,000
Loan-to-value ratio at origination	80.00%
Accrued losses on loan repurchase exposure	$ 360,500,000	$ 171,900,000