Schedule II - Financial Information of Registrant - Parent Company Only Supplemental Notes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) financialGuarantyStructuredTransaction	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Condensed Financial Statements, Captions [Line Items]
Net deferred tax liability	$ 589,564	$ 391,083
Allocated operating expenses	163,858	163,000	$ 147,386
Allocated interest expense	82,734	82,568	82,833
Other assets	37,960	65,744	65,071
Increase in other liabilities	37,999	40,499	2,914
Radian Guaranty
Condensed Financial Statements, Captions [Line Items]
Statutory policyholders' surplus	619,584	758,467	1,105,266
Distributions from radian guaranty	$ 400,000	881,979	0
Radian Guaranty | Indirect Guarantee of Indebtedness
Condensed Financial Statements, Captions [Line Items]
Number of guaranteed structured transactions for Radian Guaranty | financialGuarantyStructuredTransaction	2
Guarantor obligations, aggregate remaining credit exposure	$ 54,000
Radian Mortgage Assurance
Condensed Financial Statements, Captions [Line Items]
Statutory accounting practices, statutory capital and surplus required	5,000
Statutory policyholders' surplus	9,000
RIF	0
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net deferred tax liability	226,141	196,829
Total allocated expenses	246,592	245,568	$ 230,219
Investments in and advances to affiliates, at fair value, period increase (decrease)	$ 110,000	$ 82,000