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Statutory Information - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2024
USD ($)
Dec. 31, 2023
USD ($)
state
subsidiary
Dec. 31, 2022
USD ($)
Statutory Accounting Practices [Line Items]      
Release of contingency reserve   $ 21,000  
Prepaid federal income taxes (Note 10)   $ 750,320 $ 596,368
Original maturity of bonds   10 years  
Risk-to-capital ratio maximum   25  
Restricted net assets held by consolidated subsidiaries   $ 4,600,000  
Radian Guaranty      
Statutory Accounting Practices [Line Items]      
Number of states operated in | state   50  
Risk-to-capital ratio   10.4 10.7
Unassigned surplus   $ 120,000 $ 258,000
Payments of ordinary dividends   400,000  
Contingency reserve   $ 5,000,000 $ 4,400,000
Radian Guaranty | Subsequent Event      
Statutory Accounting Practices [Line Items]      
Payments of ordinary dividends $ 100,000    
Radian Title Insurance      
Statutory Accounting Practices [Line Items]      
Number of states operated in | state   41  
Pennsylvania      
Statutory Accounting Practices [Line Items]      
Number of subsidiaries | subsidiary   1  
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  
Profit commission %   35.00%  
Non RBC States | Minimum      
Statutory Accounting Practices [Line Items]      
Statutory capital requirements for non-RBC states   $ 1,000  
Non RBC States | Maximum      
Statutory Accounting Practices [Line Items]      
Statutory capital requirements for non-RBC states   $ 5,000