Statutory Information - Surplus Additions (Distributions) (Details) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Dec. 30, 2022	Dec. 31, 2022	Feb. 28, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Surplus [Line Items]
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus				$ (882,000)
Return of capital	$ 282,000	$ 282,000
Radian Guaranty
Statutory Surplus [Line Items]
Additions to Radian Guaranty surplus and to other insurance subsidiaries' surplus				0	$ 0	$ 200,000
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus				(881,979)	0	0
Return of capital			$ 500,000	782,000
Repayments of debt				(100,000)
Other mortgage subsidiaries
Statutory Surplus [Line Items]
Additions to Radian Guaranty surplus and to other insurance subsidiaries' surplus				0	250	0
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus				$ (32,500)	$ (40,000)	$ (465,000)