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Note 16 - Statutory Information - Statutory Information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
state
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Statutory Accounting Practices [Line Items]      
Risk To Capital Ratio, Regulatory Maximum 25    
State Insurance Regulations      
Statutory Accounting Practices [Line Items]      
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | state 16    
Radian Guaranty      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) $ 348,307 $ 103,153  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 595,981   $ 481,484
Statutory Accounting Practices, Contingency Reserve $ 3,600,000    
Risk To Capital Ratio 11.4   12.7
Radian Reinsurance      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) $ 7,418 27,039  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 364,783   $ 360,704
Other MI Companies      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) 629 378  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 42,331   41,327
Radian Title Insurance      
Statutory Accounting Practices [Line Items]      
Statutory Net Income (Loss) 2,623 $ 843  
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 31,627   $ 28,849
Consolidated insurance subsidiaries      
Statutory Accounting Practices [Line Items]      
Restricted Net Assets Held by Consolidated Subsidiaries $ 4,600,000