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Contingencies - Narrative (Details)
3 Months Ended 9 Months Ended
Jan. 23, 2015
USD ($)
Dec. 19, 2014
USD ($)
Mar. 31, 2016
USD ($)
Loan
Trust
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Loan
Loss Contingencies [Line Items]          
Warranty repurchase demands unpaid principal balance     $ 81,900,000   $ 134,600,000
Warranty repurchase demands number of loans | Loan     408   696
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    
Minimum [Member]          
Loss Contingencies [Line Items]          
Statutory penalties per alleged false claim     $ 5,500    
Maximum [Member]          
Loss Contingencies [Line Items]          
Statutory penalties per alleged false claim     11,000    
Mortgage Servicing Practice [Member]          
Loss Contingencies [Line Items]          
Estimate of possible loss     $ 39,500,000    
Unfavorable Regulatory Action [Member] | California Department of Business Oversight [Member]          
Loss Contingencies [Line Items]          
Amount of penalty in consent order $ 2,500,000        
Oversight monitor period 2 years        
Unfavorable Regulatory Action [Member] | Securities And Exchange Commission [Member]          
Loss Contingencies [Line Items]          
Estimate of possible loss       $ 2,000,000  
Accrued penalty       2,000,000  
Unfavorable Regulatory Action, Civil Penalty [Member] | New York Department of Financial Services [Member]          
Loss Contingencies [Line Items]          
Litigation settlement expense   $ 100,000,000      
Unfavorable Regulatory Action, Restitution Paid [Member] | New York Department of Financial Services [Member]          
Loss Contingencies [Line Items]          
Litigation settlement expense   $ 50,000,000      
First Uncured Violation [Member] | Maximum [Member] | Office of Mortgage Settlement Oversight [Member]          
Loss Contingencies [Line Items]          
Financial penalties in case of uncured violations       1,000,000  
Second Uncured Violation [Member] | Maximum [Member] | Office of Mortgage Settlement Oversight [Member]          
Loss Contingencies [Line Items]          
Financial penalties in case of uncured violations       $ 5,000,000