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Reinsurance - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 31, 2023 USD ($)
Ceded Credit Risk [Line Items] |  |  |  |
Ceded to Other Companies | $ 110,137 | $ 120,828 | $ 72,923 |
Mortgage insurance-linked notes |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Fair Value | 47,156 | 48,996 |  |
Mortgage insurance |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Direct primary mortgage insurance risk in force | 72,100,000 | 69,700,000 |  |
Ceded to Other Companies | 109,777 | 120,578 | $ 72,419 |
Radian Guaranty |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Funds held under reinsurance agreements, asset | 283,000 | 274,000 |  |
QSR Program | Radian Guaranty |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
RIF ceded | $ 86,000 | 100,000 |  |
Excess-of-Loss Program | Radian Guaranty |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Reinsurance optional clean-up call, outstanding principal balance percentage threshold | 0.10 |  |  |
Excess-of-Loss Program | Radian Guaranty | Mortgage insurance | 2023 XOL Agreement |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Direct primary mortgage insurance risk in force | $ 6,815,000 | 7,814,000 |  | $ 8,002,000
2024 QSR Agreement [Member] | Radian Guaranty |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
RIF ceded | $ 1,621,000 | $ 0 |  |
Maximum | Radian Guaranty | Mortgage insurance |  |  |  |
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] |  |  |  |
Reinsurance right to terminate, optional call date, years after issuance | 7 years |  |  |
Maximum | 2024 QSR Agreement [Member] |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Direct primary mortgage insurance risk in force | $ 4,300,000 |  |  |
Minimum | Radian Guaranty | Mortgage insurance |  |  |  |
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] |  |  |  |
Reinsurance right to terminate, optional call date, years after issuance | 5 years |  |  |

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