Servicing Assets and Residual Interests Economic Assumptions (Detail)	Jun. 30, 2012 years	Jun. 30, 2011 years
Fixed Rate Residential Mortgage
Servicing Assets at Amortized Value [Line Items]
Weighted- Average Life (in years)	6.9	6.6
Prepayment Speed (annual)	9.10%	11.00%
Discount Rate (annual)	10.40%	10.50%
Adjustable Rate Residential Mortgage
Servicing Assets at Amortized Value [Line Items]
Weighted- Average Life (in years)	3.7	3.7
Prepayment Speed (annual)	22.20%	22.40%
Discount Rate (annual)	11.40%	11.50%