Statutory Information - Statutory Financial Statements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) insuranceSubsidiary	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Statutory Accounting Practices [Line Items]
Number of insurance subsidiaries | insuranceSubsidiary	2
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income	$ 1,091,946	$ 762,609	$ 474,431
Statutory policyholders' surplus	758,467	1,105,266	842,188
Other mortgage subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income	1,957	1,669	1,086
Statutory policyholders' surplus	17,086	14,524	41,327
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income	2,589	6,862	2,126
Statutory policyholders' surplus	$ 39,285	$ 36,599	$ 28,849