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Contingencies - Narrative (Details)
1 Months Ended 3 Months Ended
Oct. 15, 2020
USD ($)
Apr. 20, 2017
States
Apr. 30, 2017
USD ($)
Mar. 31, 2021
USD ($)
Loan
States
Mar. 31, 2020
USD ($)
Loan
Loss Contingencies [Line Items]          
Accrued penalty       $ 40,400,000  
Number of states charging with regulatory action | States   29      
Warranty repurchase demands unpaid principal balance       $ 53,600,000 $ 44,700,000
Warranty repurchase demands number of loans | Loan       275 277
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    
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