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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Indemnification Guarantee Member | E Loan [Member]
Guarantor Obligations [Line Items]
Balance as of beginning of period	$ 8,852	$ 10,625	$ 7,740	$ 10,625
Valuation Allowances And Reserves Charged To Other Accounts	0	0	0	0
Valuation Allowances And Reserves Charged To Cost And Expense	759	0	2,024	0
Valuation Allowances And Reserves Deductions	(851)	(494)	(1,004)	(494)
Balance as of end of period	$ 8,760	$ 10,131	$ 8,760	$ 10,131