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Statutory Information - Narrative (Details)
12 Months Ended
Feb. 11, 2022
USD ($)
Sep. 22, 2021
USD ($)
Dec. 31, 2021
USD ($)
state
subsidiary
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2022
USD ($)
Statutory Accounting Practices [Line Items]            
Prepaid taxes     $ 354,123,000 $ 210,889,000    
Original maturity of bonds     10 years      
Risk-to-capital ratio     25      
Restricted net assets held by consolidated subsidiaries     $ 4,800,000,000      
Radian Guaranty            
Statutory Accounting Practices [Line Items]            
Contingency reserves     $ 93,000,000      
Number of states operated in | state     50      
Risk-to-capital     11.1 12.7    
Unassigned surplus     $ (562,800,000)      
Contingency reserve     3,900,000,000 $ 3,400,000,000    
Distributions from Radian Guaranty     0 $ 0 $ 375,000,000  
Radian Guaranty | Subsequent Event            
Statutory Accounting Practices [Line Items]            
Distributions from Radian Guaranty $ 500,000,000          
Decrease in distributions from Radian Guaranty $ 500,000,000          
Radian Guaranty | Scenario, Forecast            
Statutory Accounting Practices [Line Items]            
Distribution payments           $ 0
Radian Reinsurance            
Statutory Accounting Practices [Line Items]            
Unassigned surplus     $ 286,100,000      
Ordinary dividends paid   $ 36,000,000        
Radian Reinsurance | Scenario, Forecast            
Statutory Accounting Practices [Line Items]            
Distribution payments           $ 32,700,000
Radian Title Insurance            
Statutory Accounting Practices [Line Items]            
Number of states operated in | state     41      
Differences Between GAAP Basis and SAPP 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     2      
State Insurance Regulations            
Statutory Accounting Practices [Line Items]            
Number of states with RBC requirement | state     16      
Non RBC States | Minimum            
Statutory Accounting Practices [Line Items]            
Capital required for capital adequacy     $ 1,000,000      
Non RBC States | Maximum            
Statutory Accounting Practices [Line Items]            
Capital required for capital adequacy     $ 5,000,000