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Mortgage Servicing - Narrative (Details) (USD $)
In Billions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Transfers and Servicing [Abstract]      
Unpaid Principal Balance Of Small Balance Commercial Loans Serviced $ 2.5 $ 2.6 $ 2.0
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset $ 3.5 $ 4.7