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Reinsurance - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2022 | Jul. 31, 2023 | Jun. 30, 2023 USD ($) reinsuranceArrangement | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) reinsuranceArrangement | Jun. 30, 2022 USD ($) | Jun. 30, 2024 USD ($) | Jul. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Feb. 29, 2020 USD ($) | Apr. 30, 2019 USD ($)
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage-linked insurance notes tendered |  |  | $ 5,200,219 |  | $ 5,200,219 |  |  |  |  |  |
Ceded premiums earned |  |  | 45,885 | $ 11,594 | 71,062 | $ 26,193 |  |  |  |  |
Mortgage insurance-linked notes | Fixed-maturities available for sale |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage-linked insurance notes tendered |  |  | 50,710 |  | 50,710 |  |  |  | $ 53,019 |  |
Mortgage |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF ceded |  |  | 68,300,000 |  | 68,300,000 |  |  |  | 66,100,000 |  |
Ceded premiums earned |  |  | 45,785 | $ 11,460 | 70,862 | $ 25,913 |  |  |  |  |
Radian Guaranty |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Funds held under reinsurance agreements, asset |  |  | 186,000 |  | 186,000 |  |  |  | 175,000 |  |
Radian Guaranty | Eagle Re 2019-1 Ltd. | Mortgage insurance-linked notes | Fixed-maturities available for sale |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage-linked insurance notes tendered |  |  | $ 455,000 |  | $ 455,000 |  |  |  |  |  |
Mortgage-linked insurance notes tendered (as a percent) |  |  | 100.00% |  | 100.00% |  |  |  |  |  |
Radian Guaranty | Eagle Re 2020-1 Ltd. | Mortgage insurance-linked notes | Fixed-maturities available for sale |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage-linked insurance notes tendered |  |  | $ 332,000 |  | $ 332,000 |  |  |  |  |  |
Mortgage-linked insurance notes tendered (as a percent) |  |  | 82.00% |  | 82.00% |  |  |  |  |  |
Radian Guaranty | Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd. |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded premiums earned |  |  | $ 21,000 |  |  |  |  |  |  |  |
One-time costs recovery period |  |  |  |  | 1 year |  |  |  |  |  |
Radian Guaranty | Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd. | Forecast |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded premiums saved |  |  |  |  |  |  | $ 58,000 |  |  |  |
Radian Guaranty | Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd. | Tender Premiums |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded premiums earned |  |  | 16,000 |  |  |  |  |  |  |  |
Radian Guaranty | Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd. | Deferred Costs |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded premiums earned |  |  | $ 5,000 |  |  |  |  |  |  |  |
Radian Guaranty | Mortgage |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of fully collateralized reinsurance arrangements with Eagle Re Issuers | reinsuranceArrangement |  |  | 6 |  | 6 |  |  |  |  |  |
Number of active fully collateralized reinsurance arrangements with Eagle Re Issuers | reinsuranceArrangement |  |  | 4 |  | 4 |  |  |  |  |  |
Radian Guaranty | Maximum | Mortgage |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance retention policy, term of coverage, period |  |  |  |  | 12 years 6 months |  |  |  |  |  |
Radian Guaranty | Minimum | Mortgage |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance retention policy, term of coverage, period |  |  |  |  | 10 years |  |  |  |  |  |
Excess-of-Loss Program | Radian Guaranty |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of reinsurance coverage threshold (in percent) |  |  |  |  | 0.10 |  |  |  |  |  |
Excess-of-Loss Program | Radian Guaranty | Mortgage | Eagle Re 2019-1 Ltd. |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF ceded |  |  | $ 0 |  | $ 0 |  |  |  | 1,769,000 |  | $ 10,705,000
Excess-of-Loss Program | Radian Guaranty | Mortgage | Eagle Re 2020-1 Ltd. |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF ceded |  |  | 2,206,000 |  | $ 2,206,000 |  |  |  | 2,401,000 | $ 9,866,000 |
Excess-of-Loss Program | Radian Guaranty | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Right to termination on or after option call date, period after issuance of insurance-linked notes |  |  |  |  | 7 years |  |  |  |  |  |
Excess-of-Loss Program | Radian Guaranty | Minimum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Right to termination on or after option call date, period after issuance of insurance-linked notes |  |  |  |  | 5 years |  |  |  |  |  |
2022 QSR Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF ceded |  |  | 8,500,000 |  | $ 8,500,000 |  |  |  |  |  |
2022 QSR Agreement | Radian Guaranty |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF ceded |  |  | $ 4,611,000 |  | $ 4,611,000 |  |  |  | $ 3,307,000 |  |
Ceding commission % | 20.00% |  |  |  |  |  |  |  |  |  |
2022 QSR Agreement | Radian Guaranty | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Profit commission % | 59.00% |  |  |  |  |  |  |  |  |  |
2023 QSR | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of policies ceded to reinsurer |  | 0.225 |  |  |  |  |  |  |  |  |
2023 QSR | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF ceded |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
2023 QSR | Radian Guaranty | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceding commission % |  | 20.00% |  |  |  |  |  |  |  |  |
2023 QSR | Radian Guaranty | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Profit commission % |  | 55.00% |  |  |  |  |  |  |  |  |

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