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Mortgage Servicing - Narrative (Details)
$ in Billions
 3 Months Ended
Mar. 31, 2016
USD ($)
Agreement
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Servicing Asset at Amortized Cost [Line Items]      
Unpaid principal balance of small balance commercial loans serviced | $ $ 1.7 $ 1.8 $ 2.1
Number of non-agency and whole loans servicing agreements 3,908    
Number of non-agency and whole loans servicing agreements with minimum servicer ratings 735    
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings | $ $ 38.1    
Number of non-agency and whole loans servicing agreements with termination rights triggered 651    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered | $ $ 32.4    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 18.00%    
Number of triggered agreements where trustees and master servicers have currently no intention to take action relating to termination rights 272    
Number of non-agency servicing agreements with termination rights triggered where trustees and master servicers sent solicitation notices to investors 69    
Number of results announced in connection with solicitation notices sent by trustees and master servicers to investors 47    
Number of solicitation notice results in which there is no direction to terminate company as servicer 43    
Unpaid principal balance of non-agency servicing portfolio with no direction to terminate company as servicer | $ $ 19.3    
Percentage of unpaid principal balance of non-agency servicing portfolio with no direction to terminate company as servicer to non-agency portfolio 59.60%    
Percentage of servicing transferred due to downgrades in mortgage servicer rating 0.17%    
Float balances | $ $ 2.3   4.0
NRZ [Member]      
Servicing Asset at Amortized Cost [Line Items]      
Primary servicing UPB | $ $ 132.7 $ 137.1 $ 156.3
Number of non-agency servicing agreements terminated due to downgrades in mortgage servicer rating 4