Statutory Information - Statutory Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 271,348	$ 166,755
Statutory policyholders' surplus	422,566		$ 778,148
Radian Reinsurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(267)	1,885
Statutory policyholders' surplus	325,262		327,118
Other mortgage subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	558	65
Statutory policyholders' surplus	15,102		14,524
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	1,271	$ 1,317
Statutory policyholders' surplus	$ 37,817		$ 36,599