Statutory Information - Statutory Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 199,171	$ 271,081
Statutory policyholders’ surplus	720,765		$ 758,467
Other mortgage subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(388)	558
Statutory policyholders’ surplus	17,152		17,086
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	253	$ 1,271
Statutory policyholders’ surplus	$ 39,514		$ 39,285