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Mortgage Servicing - Narrative (Details)
$ in Billions
 6 Months Ended
Jun. 30, 2017
USD ($)
Agreement
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Transfers and Servicing [Abstract]      
Unpaid principal balance of small balance commercial loans serviced $ 1.0 $ 1.4 $ 1.6
Number of non-agency and whole loans servicing agreements | Agreement 3,709    
Number of non-agency and whole loans servicing agreements with minimum servicer ratings | Agreement 718    
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings $ 31.9    
Number of non-agency and whole loans servicing agreements with termination rights triggered | Agreement 174    
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered $ 10.1    
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio 7.00%    
Float balances $ 2.2   $ 2.7