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MSR Transfers Not Qualifying for Sale Accounting - Narrative (Details)
$ in Millions
May 02, 2022
Sep. 30, 2023
USD ($)
subservicer
Dec. 31, 2022
USD ($)
Servicing Assets at Fair Value [Line Items]      
Pledged MSR subject to derecognition   $ 450.7 $ 450.7
Automatic renewal term 1 year    
Number of subservicers | subservicer   3  
Ocwen Financial Corporation      
Servicing Assets at Fair Value [Line Items]      
Servicing agreements notice of termination 6 months    
Rithm      
Servicing Assets at Fair Value [Line Items]      
Servicing agreements notice of termination 3 months    
New RMSR Agreements | Rithm      
Servicing Assets at Fair Value [Line Items]      
UPB of rights to MSRs sold   $ 46,000.0  
2017 Agreements and New RMSR Agreements | Mortgage Servicing Rights Title Retained      
Servicing Assets at Fair Value [Line Items]      
UPB of rights to MSRs sold   1,800.0  
2017 Agreements and New RMSR Agreements | Mortgage Servicing Rights Title Retained | Rithm      
Servicing Assets at Fair Value [Line Items]      
UPB of rights to MSRs sold   $ 10,100.0  
Servicing agreements notice of termination 3 months