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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Footnote) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Servicing Asset at Amortized Cost [Line Items]    
Deferred gain on sale of MSRs   $ 5.1
Non Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Amortized Cost [Line Items]    
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings $ 52.0  
Deferred income taxes 9.4  
Unpaid principal balance of MSRs $ 195,300.0