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Mortgage Servicing - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Transfers and Servicing [Abstract]    
UPB of MSRs sold $ 10.5 $ 134.7
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings 27,900.0  
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 8,700.0  
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 9.00%  
Float balances $ 1,700.0 $ 2,200.0