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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Footnote) (Details) - Dec. 31, 2014 - Non Agency Mortgage Servicing Rights [Member] - USD ($)
$ in Millions
Total
Servicing Asset at Amortized Cost [Line Items]  
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings $ 52.0
Deferred income taxes 9.2
Unpaid principal balance of MSRs $ 195,300.0