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Mortgage Servicing - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Agreement
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Transfers and Servicing [Abstract]      
Unpaid principal balance of small balance commercial loans serviced $ 1,000.0 $ 1,500.0 $ 1,400.0
Mortgage Loans on Real Estate, Cost of Mortgages Sold $ 210.2 3,600.0  
Number of non-agency and whole loans servicing agreements | Agreement 3,325    
Number of non-agency and whole loans servicing agreements with minimum servicer ratings | Agreement 712    
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings $ 30,800.0    
Number of non-agency and whole loans servicing agreements with termination rights triggered | Agreement 172    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 9,700.0    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 7.00%    
Float balances $ 2,000.0 $ 2,600.0