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Related Party Transactions - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 27, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Transactions with Affiliates            
Amount of tax benefits under the tax sharing agreement (as a percent)       85.00%    
Payable to exchanged PNMAC unitholders under tax receivable agreement   $ 26,100,000   $ 26,100,000   $ 26,100,000
Interest income   225,470,000 $ 166,552,000 582,707,000 $ 467,982,000  
Related Party | Townsgate Closing Services, LLC            
Transactions with Affiliates            
Ownership interest 60.00%          
Related Party | Private National Mortgage Acceptance Company            
Transactions with Affiliates            
Payment of tax liability under the tax receivable agreement to Private National Mortgage Acceptance Company, LLC unitholders   0 0 0 0  
Related Party | Townsgate Closing Services, LLC            
Transactions with Affiliates            
Advances to related party $ 801,000          
Maximum commitment amount $ 1,500,000          
Advances variable rate 10+ year USD High Yield Corporate Bond Index          
Interest income   $ 0 $ 21,000 $ 20,000 $ 63,000