Changes in the Corporation's liability of estimated losses associated with customary respresentations and warranties related to loans sold by E-LOAN (Detail) (Indemnification Guarantee Member, E Loan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Indemnification Guarantee Member | E Loan [Member]
Guarantor Obligations [Line Items]
Balance as of beginning of period	$ 10,625	$ 30,659
Valuation Allowances And Reserves Charged To Other Accounts	0	0
Valuation Allowances And Reserves Charged To Cost And Expense	0	83
Valuation Allowances And Reserves Deductions	0	(54)
Valuation Allowances And Reserves Deductions Settlements Paid	0	0
Balance as of end of period	$ 10,625	$ 30,688