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Note 19 - Statutory Information Statutory Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Statutory Accounting Practices [Line Items]          
Restricted Net Assets Held by Consolidated Subsidiaries   $ 3,600,000      
PENNSYLVANIA          
Statutory Accounting Practices [Line Items]          
Policyholder Dividends, Rate on Policy Earnings   10.00%      
Radian Guaranty          
Statutory Accounting Practices [Line Items]          
Surplus Note   $ 100,000 $ 100,000    
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency $ 175,000 (450,000)      
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) 175,000 (56,000)      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance   814,100 1,201,000 $ 1,349,700  
Negative Unassigned Surplus   701,900 765,000    
Statutory Accounting Practices, Statutory Net Income Amount   501,900 445,100 480,800  
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments   0      
Impact of Reallocation of Capital on Available Assets Under PMIERs         $ 0
Radian Reinsurance          
Statutory Accounting Practices [Line Items]          
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) (175,000)        
Statutory Accounting Practices, Statutory Capital and Surplus, Balance   356,200 328,900 147,600  
Negative Unassigned Surplus   84,800 112,100    
Statutory Accounting Practices, Statutory Net Income Amount   86,100 64,300 $ 60,300  
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments   0      
Capital Contributions (175,000)        
Radian Group Inc.          
Statutory Accounting Practices [Line Items]          
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency (175,000)        
Capital Contributions $ 175,000        
Parent Company          
Statutory Accounting Practices [Line Items]          
Restricted Net Assets Held by Consolidated Subsidiaries   $ 3,927,268 $ 3,764,865