Statutory Information - Schedule of Statutory Net Income (Loss) and Statutory Policyholders' Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 794,699	$ 803,804	$ 1,091,946
Statutory policyholders' surplus	722,861	619,584	758,467
Other Mortgage Insurance Subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(1,546)	311	1,957
Statutory policyholders' surplus	16,515	17,444	17,086
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	2,493	1,844	2,589
Statutory policyholders' surplus	$ 43,540	$ 41,108	$ 39,285