Statutory Information - Schedule of Surplus Additions (Distributions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Radian Guaranty
Statutory Surplus [Line Items]
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus	$ (675,000)	$ (400,000)	$ (881,979)
Other Mortgage Insurance Subsidiaries
Statutory Surplus [Line Items]
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus	0	0	(32,500)
Additions to Radian Guaranty surplus and to other insurance subsidiaries' surplus	$ 0	$ 250	$ 0