Schedule II - Financial Information of Registrant - Parent Company Only Supplemental Notes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) financialGuarantyStructuredTransaction	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Condensed Financial Statements, Captions [Line Items]
Net deferred tax liability	$ 391,083	$ 337,509
Allocated operating expenses	163,000	147,386	$ 129,870
Allocated interest expense	82,568	82,833	68,938
Distributions from Radian Guaranty	882,000
Increase in other assets	(65,744)	(65,071)	(114,769)
Increase in other liabilities	(40,499)	(2,914)	(54,980)
Mortgage financing facilities
Condensed Financial Statements, Captions [Line Items]
Mortgage financing facilities outstanding	2,136	0
Radian Mortgage Assurance
Condensed Financial Statements, Captions [Line Items]
Statutory accounting practices, statutory capital and surplus required	5,000
Statutory policyholders' surplus	8,800
RIF	0
Radian Guaranty
Condensed Financial Statements, Captions [Line Items]
Statutory policyholders' surplus	758,467	1,105,266	842,188
Distributions from Radian Guaranty	$ 881,979	0	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	$ 58,400
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net deferred tax liability	196,829	283,585
Total allocated expenses	245,568	230,219	$ 198,808
Investments in and advances to affiliates, at fair value, period increase (decrease)	82,000	$ 48,500
Increase in other assets	66,500
Increase in other liabilities	$ 60,300