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Residential Mortgage Loans - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
State
Investment
Jan. 31, 2025
USD ($)
Jun. 30, 2024
Dec. 31, 2023
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Mortgage loans held for sale-at fair value $ 519,885     $ 32,755
Variable Interest Entity, Primary Beneficiary        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net consolidated assets (liabilities) 12,000      
Residential Mortgage Loans Held for Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Mortgage loans held for sale-at fair value $ 520,000     $ 33,000
Number of investments | Investment 808      
Residential mortgage loans held for sale-unpaid principal balance $ 521,000      
Number of states | State 44      
Commitments to purchase and fund mortgage loans $ 52,000      
Unpaid principal balance of loans 63.00%   97.00%  
Residential Mortgage Loans Held for Sale | California        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage of loans on properties 24.00%      
Residential Mortgage Loans Held for Sale | California | Subsequent Event        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Residential mortgage loans held for sale for FEMA designated areas   $ 3,000    
Residential Mortgage Loans Held for Sale | California | Maximum [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage of loans for FEMA Designated Areas 1.00%      
Residential Mortgage Loans Held for Sale | Other State        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage of loans on properties 10.00%      
Residential Mortgage Loans Held for Sale | Financial Asset, Equal to or Greater than 90 Days Past Due        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of investments | Investment 0      
Radian Mortgage Capital | Residential Mortgage Loans Held for Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage of net worth for debt covenants 6.00%      
Net worth for debt covenants $ 103,000      
Minimum net worth for debt covenants 36,000      
Radian Mortgage Capital Trust 2024-J1        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Private offering of mortgage loans 349,000      
Radian Mortgage Capital Trust 2024-J2        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Private offering of mortgage loans $ 423,000