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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Transfers and Servicing [Abstract]    
UPB of MSRs sold $ 580.0 $ 210.2
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings 27,000.0  
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 8,400.0  
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 9.00%  
Float balances $ 1,700.0 $ 2,000.0