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Contingencies - Narrative (Details)
3 Months Ended 12 Months Ended
Jan. 20, 2016
USD ($)
Jan. 23, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loan
Sep. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Loan
License
Trust
Dec. 31, 2014
USD ($)
Loan
Sep. 30, 2015
USD ($)
Loss Contingencies [Line Items]              
Minimum servicing licenses required | License         1    
Outstanding representation and warranty repurchase demands     $ 96,600,000   $ 97,500,000 $ 96,600,000  
Outstanding representation and warranty repurchase demands, number of loans | Loan     511   506 511  
Mortgage Servicing Practice [Member]              
Loss Contingencies [Line Items]              
Amount accrued for losses relating to threatened and pending litigation         $ 40,200,000    
Minimum [Member] | False Claims [Member]              
Loss Contingencies [Line Items]              
Loss Contingency, Damages Sought, Value         5,000    
Maximum [Member] | False Claims [Member]              
Loss Contingencies [Line Items]              
Loss Contingency, Damages Sought, Value         $ 10,000    
RMBS Trusts [Member]              
Loss Contingencies [Line Items]              
Ownership interest in trusts         25.00%    
Number of trusts where trustees received notice of servicer non-performance | Trust         119    
Number of trusts to terminate as servicer in case if allegations proved | Trust         119    
Number of trust where servicing transferred to another loan servicer | Trust         2    
New York Department of Financial Services [Member] | Unfavorable Regulatory Action [Member]              
Loss Contingencies [Line Items]              
Litigation settlement expense     $ 50,000,000 $ 100,000,000      
Office of Mortgage Settlement Oversight [Member] | Maximum [Member] | First Uncured Violation [Member]              
Loss Contingencies [Line Items]              
Financial penalties in case of uncured violations           $ 1,000,000  
Office of Mortgage Settlement Oversight [Member] | Maximum [Member] | Second Uncured Violation [Member]              
Loss Contingencies [Line Items]              
Financial penalties in case of uncured violations           $ 5,000,000  
California Department of Business Oversight [Member] | Unfavorable Regulatory Action [Member]              
Loss Contingencies [Line Items]              
Amount of penalty in consent order   $ 2,500,000          
Period of oversight by an independent national monitor   2 years          
Securities And Exchange Commission [Member] | Unfavorable Regulatory Action [Member]              
Loss Contingencies [Line Items]              
Accrued penalty             $ 2,000,000
Subsequent Event [Member] | Securities And Exchange Commission [Member] | Unfavorable Regulatory Action [Member]              
Loss Contingencies [Line Items]              
Amount of penalty in consent order $ 2,000,000