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Schedule II - Financial Information of Registrant - Parent Company Only Supplemental Notes - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) FinancialGuarantyStructuredTransaction | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |
Net deferred tax liability | $ 746,685 | $ 589,564 |
Net operating loss expiration date | 2027 |  |
Radian Guaranty |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Statutory policyholders' surplus | $ 722,861 | 619,584 | $ 758,467
Payments of ordinary dividends | $ 675,000 |  |
Radian Guaranty | Indirect Guarantee of Indebtedness |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Number of guaranteed structured transactions for Radian Guaranty | FinancialGuarantyStructuredTransaction | 2 |  |
Guarantor obligations, aggregate remaining credit exposure | $ 40,000 |  |
Radian Mortgage Assurance |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Statutory accounting practices, statutory capital and surplus required | 5,000 |  |
Statutory policyholders' surplus | 9,000 |  |
RIF | 0 |  |
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net deferred tax liability | 245,692 | 226,141 |
Investments in and advances to affiliates, at fair value, period increase (decrease) | $ 76,000 | $ 110,000 |

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