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Mortgage Servicing - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Loan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Transfers and Servicing [Abstract]      
UPB of small-balance commercial assets $ 1,400.0 $ 1,800.0 $ 2,300.0
Number of non-agency and whole loans servicing agreements | Loan 3,796    
Number of non-agency and whole loans servicing agreements with minimum servicer ratings | Loan 718    
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings $ 34,100.0    
Number of non-agency and whole loans servicing agreements with termination rights triggered | Loan 174    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 10,800.0    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 6.80%    
Float balances $ 2,100.0 $ 2,200.0 $ 4,300.0
Income recognized in connection with execution of clean-up call on securitization trusts 14.8    
Discount on repurchase price $ 2.8