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Mortgage Servicing Assets (Details) (Residential mortgage loans, USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Residential mortgage loans
Mortgage Servicing Assets
Unpaid principal balance	$ 851.70	$ 921.20

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

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