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Note 7 - Reinsurance Reinsurance (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Radian Guaranty [Member]
Initial Quota Share Reinsurance Transaction [Member]
Jun. 30, 2012
Radian Guaranty [Member]
Initial Quota Share Reinsurance Transaction [Member]
Mar. 31, 2013
Radian Guaranty [Member]
Second Quota Share Reinsurance Transaction [Member]
Dec. 31, 2014
Initial Quota Share Reinsurance Transaction [Member]
Scenario, Forecast [Member]
Jan. 31, 2012
January 2012 Assured Guaranty Ceded Public Finance Transaction [Member]
Radian Asset Assurance [Member]
counterparty
Mar. 31, 2012
January 2012 Assured Guaranty Transaction [Member]
Radian Asset Assurance [Member]
Jan. 31, 2012
January 2012 Assured Guaranty Reinsurance Commutation [Member]
Radian Asset Assurance [Member]
Dec. 31, 2015
Second Quota Share Reinsurance Transaction [Member]
Scenario, Forecast [Member]
Dec. 31, 2012
Second Quota Share Reinsurance Transaction [Member]
Radian Guaranty [Member]
Conventional Mortgage Loan [Member]
Dec. 31, 2012
Second Quota Share Reinsurance Transaction [Member]
Radian Guaranty [Member]
Non Conventional Mortgage Loan [Member]
Dec. 31, 2012
Second Quota Share Reinsurance Transaction [Member]
Radian Guaranty [Member]
Maximum [Member]
Dec. 31, 2012
Second Quota Share Reinsurance Transaction [Member]
Radian Guaranty [Member]
Minimum [Member]
Jan. 31, 2013
Reinsurance [Member]
2012 FGIC Commutation [Member]
Radian Asset Assurance [Member]
Mar. 31, 2013
Reinsurance [Member]
2012 FGIC Commutation [Member]
Radian Asset Assurance [Member]
Apr. 02, 2013
Revised Second Quota Share Reinsurance Transaction [Member]
Second Quota Share Reinsurance Transaction [Member]
Radian Guaranty [Member]
Conventional Mortgage Loan [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                                    
Ceded Credit Risk, Unearned Premiums $ 75,000,000   $ 64,500,000                              
Net premiums written-insurance [Abstract]                                    
Direct Premiums Written 245,467,000 203,753,000                                
Assumed Premiums Written (10,397,000) (87,488,000)                                
Ceded Premiums Written (27,885,000) (38,587,000)   (6,100,000)   (16,400,000)                        
Net premiums written 207,185,000 77,678,000                                
Net premiums earned-insurance [Abstract]                                    
Direct Premiums Earned 207,940,000 192,016,000                                
Assumed Premiums Earned 2,211,000 (10,685,000)                                
Ceded Premiums Earned (17,563,000) (13,966,000)   (7,800,000)   (2,800,000)                        
Net premiums earned-insurance 192,588,000 167,365,000                                
Number of Derivative Counterparties Involved in Commutation               1                    
Assumed Premiums Written, Financial Guarantee Insurance Contracts                                 12,600,000  
Assumed Premiums Earned, Financial Guarantee Insurance Contracts                                 2,500,000  
Reduction In Net Par Outstanding               1,800,000,000   13,800,000,000           822,200,000    
Premiums Written, Net, Financial Guarantee Insurance Contracts                 119,800,000                  
Premiums Earned, Net, Financial Guarantee Insurance Contracts                 22,200,000                  
Percentage of New Insurance Written To Be Ceded         20.00%                          
Fees and Commissions       1,500,000   5,800,000                        
Percentage of Premium and Losses Incurred To Be Ceded                       20.00% 100.00%         5.00%
Ceding Commission Percentage                       35.00% 25.00%          
Ceded Commission Percentage Charged on Ceded Risk in Force in the Event of Unexercised Commutation Option                       30.00%            
First Lien Primary Mortgage Insurance Risk In Force Ceded       $ 1,500,000,000   $ 900,000,000               $ 2,000,000,000 $ 750,000,000      
Percentage of Reinsurance Able To Be Commuted             67.00%       50.00%