Reinsurance - Total VIE Assets and Liabilities of Eagle Re Issuers (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Total assets	$ 9,580,657	$ 8,663,988
Total liabilities	5,087,976	4,040,130
Excess-of-Loss Program | Radian Guaranty
Ceded Credit Risk [Line Items]
Total assets	609,272	729,181
Total liabilities	609,272	729,181
Eagle Re 2023-1 Ltd. | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	293,690	326,855
Total liabilities	293,690	326,855
Eagle Re 2021-2 Ltd. | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	198,568	247,442
Total liabilities	198,568	247,442
Eagle Re 2021-1 Ltd. | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	117,014	154,884
Total liabilities	$ 117,014	$ 154,884