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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Servicing Asset at Amortized Cost [Line Items]      
Unpaid principal balance of small balance commercial loans serviced $ 1,900.0 $ 2,300.0 $ 2,400.0
Float balances 2,000.0   $ 3,700.0
NRZ [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Reimbursements on account of loss of servicing revenues $ 2.2