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Reinsurance - Additional Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Radian Guaranty    
Ceded Credit Risk [Line Items]    
Funds held under reinsurance agreements, asset $ 304 $ 283
Mortgage Insurance revenues    
Ceded Credit Risk [Line Items]    
Direct primary mortgage insurance risk in force $ 74,000 $ 72,100
Maximum | Mortgage Insurance revenues | Radian Guaranty    
Ceded Credit Risk [Line Items]    
Reinsurance retention policy, term of coverage, period 12 years 6 months  
Maximum | Excess-of-Loss Program | Radian Guaranty    
Ceded Credit Risk [Line Items]    
Right to termination on or after option call date, period after issuance of insurance-linked notes 7 years  
Minimum | Mortgage Insurance revenues | Radian Guaranty    
Ceded Credit Risk [Line Items]    
Reinsurance retention policy, term of coverage, period 10 years  
Minimum | Excess-of-Loss Program | Radian Guaranty    
Ceded Credit Risk [Line Items]    
Right to termination on or after option call date, period after issuance of insurance-linked notes 5 years