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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Footnote) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Servicing Asset at Amortized Cost [Line Items]          
Proceeds from sale of mortgage servicing rights $ 598,059 $ 287 $ 287 $ 34,754 $ 0
Deferred gain on sale of MSRs       $ 5,100  
OneWest MSR Transaction [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Unpaid principal balance acquired     1,100,000    
Servicing advances acquired     34,300    
Greenpoint MSR Transaction [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Unpaid principal balance acquired     7,300,000    
Servicing advances acquired     469,700    
Mortgage Servicing Rights [Member] | OneWest MSR Transaction [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Unpaid principal balance acquired     70,100,000    
Servicing advances acquired     2,100,000    
Mortgage Servicing Rights [Member] | Greenpoint MSR Transaction [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Unpaid principal balance acquired     948,900    
Servicing advances acquired     47,600    
Non Agency Mortgage Servicing Rights [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings     52,000    
Deferred income taxes     9,200    
Unpaid principal balance of MSRs     $ 195,300,000