Statutory Information - Schedule of Statutory Net Income (Loss) and Statutory Policyholders' Surplus (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 588,122	$ 599,781
Statutory policyholders’ surplus	691,147		$ 619,584
Other Mortgage Insurance Subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(1,295)	(383)
Statutory policyholders’ surplus	16,567		17,444
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	1,438	$ 1,306
Statutory policyholders’ surplus	$ 42,379		$ 41,108