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Contingencies - Narrative (Details)
 1 Months Ended 9 Months Ended
Oct. 15, 2020
USD ($)
Apr. 20, 2017
States
State
Apr. 30, 2017
USD ($)
Sep. 30, 2020
USD ($)
Loan
States
Sep. 30, 2019
USD ($)
Loan
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]            
Accrued penalty       $ 31,000,000.0    
Number of states charging with regulatory action | States   29        
Number of state attorneys general charging with regulatory action | State   2        
Warranty repurchase demands unpaid principal balance       $ 45,200,000 $ 49,900,000  
Warranty repurchase demands number of loans | Loan       263 289  
PHH Corporation            
Loss Contingencies [Line Items]            
Accrued penalty           $ 2,500,000
Florida Attorney General            
Loss Contingencies [Line Items]            
Injunctive and equitable relief, costs, and civil money penalties sought     $ 10,000      
Florida Attorney General | Subsequent Event            
Loss Contingencies [Line Items]            
Litigation settlement expense $ 5,200,000          
Debt forgiveness to certain borrowers 1,000,000.0          
Obligation in case of not satisfying the initial debt forgiveness $ 1,000,000.0          
Multistate Mortgage Committee            
Loss Contingencies [Line Items]            
Number of states who are part of confidential supervisory memorandum of understanding | States       6