Statutory Information - Statutory Dividend Restrictions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Radian Guaranty
Additions to Radian Guaranty surplus and to other insurance subsidiaries' surplus	$ 0	$ 200,000	$ 0
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus	0	0	(375,000)
Other mortgage subsidiaries
Additions to Radian Guaranty surplus and to other insurance subsidiaries' surplus	250	0	65,200
Distributions from Radian Guaranty surplus and from other insurance subsidiaries' surplus	$ (40,000)	$ (465,000)	$ (14,000)