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Securitizations and Variable Interest Entities ("VIEs") (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
2006 Transaction [Member]
Securitizations And Variable Interest Entities [Line Items]
Fixed-rate home mortgage loans and variable-rate line of credit loans	$ 349,403
Variable-rate loans	70.50%
Principal balance of loans, percentage	10.00%
2005 Transaction [Member]
Securitizations And Variable Interest Entities [Line Items]
Variable-rate loans	35.40%
Principal balance of loans, percentage	10.00%
Home Equity Line Of Credit Loans	$ 239,766

Amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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