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Contingencies - Narrative (Details)
 6 Months Ended
Jan. 23, 2015
USD ($)
Dec. 19, 2014
USD ($)
Jun. 30, 2016
USD ($)
Loan
Trust
Jun. 30, 2015
USD ($)
Agreement
Loan
Loss Contingencies [Line Items]        
Estimate of possible loss     $ 58,800,000  
Number of trust where servicing transferred to another loan servicer | Agreement       4
Warranty repurchase demands unpaid principal balance     $ 72,500,000 $ 120,300,000
Warranty repurchase demands number of loans | Loan     354 607
Fisher Cases [Member]        
Loss Contingencies [Line Items]        
Litigation settlement amount     $ 15,000,000  
Litigation settlement expense     15,000,000  
Accrued penalty     30,000,000  
Minimum [Member] | Fisher Cases [Member]        
Loss Contingencies [Line Items]        
Statutory penalties per alleged false claim     5,500  
Maximum [Member] | Fisher Cases [Member]        
Loss Contingencies [Line Items]        
Statutory penalties per alleged false claim     11,000  
New York Department of Financial Services [Member] | Unfavorable Regulatory Action [Member]        
Loss Contingencies [Line Items]        
Oversight monitor period   2 years    
Independent operations monitor period extendable at discretion of regulator   1 year    
New York Department of Financial Services [Member] | Unfavorable Regulatory Action, Civil Penalty [Member]        
Loss Contingencies [Line Items]        
Litigation settlement expense   $ 100,000,000    
New York Department of Financial Services [Member] | Unfavorable Regulatory Action, Restitution Paid [Member]        
Loss Contingencies [Line Items]        
Litigation settlement expense   $ 50,000,000    
Office of Mortgage Settlement Oversight [Member]        
Loss Contingencies [Line Items]        
Consumer relief credits     2,100,000,000  
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]        
Accrued penalty     $ 15,000,000  
Oversight monitor period   2 years    
Amount of penalty in consent order $ 2,500,000      
Residential Mortgage Backed Securities [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