Statutory Information - Statutory Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 200,483	$ 199,171
Statutory policyholders’ surplus	703,315		$ 619,584
Other mortgage insurance subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	(430)	(388)
Statutory policyholders’ surplus	17,105		17,444
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	584	$ 253
Statutory policyholders’ surplus	$ 41,676		$ 41,108