Reinsurance - Total VIE Assets and Liabilities of Eagle Re Issuers (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Ceded Credit Risk [Line Items]
Total assets	$ 7,204,402	$ 7,063,729
Total liabilities	3,097,924	3,144,402
Excess-of-Loss Program | Radian Guaranty
Ceded Credit Risk [Line Items]
Total assets	1,789,145	1,866,809
Total liabilities	1,789,145	1,866,809
Eagle Re 2021-2 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	448,724	471,942
Total liabilities	448,724	471,942
Eagle Re 2021-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	333,182	366,169
Total liabilities	333,182	366,169
Eagle Re 2020-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	346,918	368,378
Total liabilities	346,918	368,378
Eagle Re 2019-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	384,603	384,602
Total liabilities	384,603	384,602
Eagle Re 2018-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	275,718	275,718
Total liabilities	$ 275,718	$ 275,718