Reinsurance - Total VIE Assets and Liabilities of Eagle Re Issuers (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Total assets	$ 6,985,843	$ 7,839,185
Total liabilities	3,247,793	3,580,389
Excess-of-Loss Program | Radian Guaranty
Ceded Credit Risk [Line Items]
Total assets	1,940,126	2,274,548
Total liabilities	1,940,126	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	401,377	497,735
Total liabilities	401,377	497,735
Eagle Re 2020-2 Ltd. (2) | Variable Interest Entity, Primary Beneficiary | Excess-of-Loss Program | Radian Guaranty | Mortgage
Ceded Credit Risk [Line Items]
Total assets	0	143,986
Total liabilities	0	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	394,306	488,385
Total liabilities	394,306	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	384,603	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