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Mortgage Servicing - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
loan
Mar. 31, 2018
USD ($)
Transfers and Servicing [Abstract]    
Portfolio of loans acquired | loan 22,083  
UPB of loans acquired $ 4,900.0  
Portfolio of loans sold | loan 304  
UPB of MSRs sold $ 99.4  
Servicing agreements with minimum servicer rating criteria | loan 695  
UPB of non-agency and whole loans servicing agreements with minimum servicer ratings $ 25,100.0  
Servicing agreements with termination rights triggered | loan 170  
UPB of non-agency and whole loans servicing agreements with termination rights triggered $ 7,900.0  
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 8.00%  
Float balances $ 1,800.0 $ 1,600.0