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Mortgage Servicing - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Agreement
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Servicing Asset at Amortized Cost [Line Items]        
Unpaid principal balance of small balance commercial loans serviced $ 1,500.0 $ 1,500.0 $ 1,800.0 $ 1,900.0
Number of non-agency and whole loans servicing agreements | Agreement   3,840    
Number of non-agency and whole loans servicing agreements with minimum servicer ratings | Agreement   729    
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings 35,800.0 $ 35,800.0    
Number of non-agency and whole loans servicing agreements with termination rights triggered | Agreement   180    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered 11,500.0 $ 11,500.0    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio   6.90%    
Percentage of servicing transferred due to downgrades in mortgage servicer rating   0.17%    
Float balances 2,600.0 $ 2,600.0   3,100.0
Income recognized in connection with execution of clean-up call on securitization trusts 12.8      
Discount on repurchase price 2.5      
NRZ [Member]        
Servicing Asset at Amortized Cost [Line Items]        
UPB of MSRs sold $ 123,200.0 $ 123,200.0 $ 137,100.0 $ 146,000.0