Statutory Information - Narrative (Details) $ in Thousands		1 Months Ended		12 Months Ended
	Dec. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) state subsidiary	Feb. 28, 2022 USD ($)	Dec. 31, 2022 USD ($) state subsidiary	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2022 USD ($)
Statutory Accounting Practices [Line Items]
Return of capital	$ 282,000	$ 282,000
Prepaid taxes		$ 596,368		$ 596,368	$ 354,123
Original maturity of bonds				10 years
Risk-to-capital ratio maximum		25		25
Restricted net assets held by consolidated subsidiaries		$ 4,300,000		$ 4,300,000
Distributions from Radian Guaranty				$ 882,000
Credit Risk Transfer Transactions
Statutory Accounting Practices [Line Items]
RIF							$ 276,000
Radian Guaranty
Statutory Accounting Practices [Line Items]
Number of states operated in | state		50		50
Return of capital			$ 500,000	$ 782,000
Risk-to-capital ratio		10.7		10.7	11.1
Unassigned surplus		$ 258,500		$ 258,500	$ (562,800)
Contingency reserve		$ 4,400,000		4,400,000	3,900,000
Distributions from Radian Guaranty				$ 881,979	$ 0	$ 0
Radian Reinsurance
Statutory Accounting Practices [Line Items]
Admitted assets							$ 325,000
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Number of states operated in | state		41		41
Differences Between GAAP Basis and SAP Basis
Statutory Accounting Practices [Line Items]
Special contingency reserve equal to premiums earned, percent				50.00%
Years contingency reserve maintained				10 years
Loss ratio, percent				35.00%
PENNSYLVANIA
Statutory Accounting Practices [Line Items]
Number of subsidiaries | subsidiary		1		1
State Insurance Regulations
Statutory Accounting Practices [Line Items]
Number of states with RBC requirement | state		16		16
Non RBC States | Minimum
Statutory Accounting Practices [Line Items]
Statutory capital requirements for non-RBC states		$ 1,000		$ 1,000
Non RBC States | Maximum
Statutory Accounting Practices [Line Items]
Statutory capital requirements for non-RBC states		$ 5,000		$ 5,000