Reinsurance - Total VIE Assets and Liabilities of Eagle Re Issuers (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Ceded Credit Risk [Line Items]
Total assets	$ 7,759,865	$ 7,593,933
Total liabilities	3,320,133	3,196,128
Excess-of-Loss Program | Radian Guaranty
Ceded Credit Risk [Line Items]
Total assets	908,615	964,909
Total liabilities	908,615	964,909
Eagle Re 2023-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	353,077	353,077
Total liabilities	353,077	353,077
Eagle Re 2021-2 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	328,326	354,947
Total liabilities	328,326	354,947
Eagle Re 2021-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	227,212	250,268
Total liabilities	227,212	250,268
Eagle Re 2020-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage Insurance revenues
Ceded Credit Risk [Line Items]
Total assets	0	6,617
Total liabilities	$ 0	$ 6,617