Reinsurance - Total VIE Assets and Liabilities of Eagle Re Issuers (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Total assets	$ 7,615,746	$ 7,839,185
Total liabilities	3,468,182	3,580,389
Excess-of-Loss Program | Radian Guaranty
Ceded Credit Risk [Line Items]
Total assets	2,199,919	2,274,548
Total liabilities	2,199,919	2,274,548
Eagle Re 2021-2 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	484,122	484,122
Total liabilities	484,122	484,122
Eagle Re 2021-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	464,469	497,735
Total liabilities	464,469	497,735
Eagle Re 2020-2 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	102,623	143,986
Total liabilities	102,623	143,986
Eagle Re 2020-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	488,385	488,385
Total liabilities	488,385	488,385
Eagle Re 2019-1 Ltd. | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	384,602	384,602
Total liabilities	384,602	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