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Note 16 - Statutory Information - Statutory Financial Statements (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) payment state subsidiaries | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Statutory Accounting Practices [Line Items] |  |  |  |
Prepaid federal income taxes (Note 10) |  | $ 210,889 | $ 134,800 |
Payments Made on Surplus Note | payment |  | 0 |  |
Radian Guaranty |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory Accounting Practices, Release of Contingency Reserves |  | $ 93,000 |  |
Related Party Transaction, Rate | 3.00% |  |  |
Number of States in which Entity Operates | state |  | 50 |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | $ 441,900 | 703,400 | $ 501,900
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | 481,500 | 637,700 | 814,100
Surplus Note | $ 200,000 |  |  |
Radian Reinsurance |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Risk In Force | 6,000,000 |  |  |
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency | 465,000 |  |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | 32,500 | 101,600 | 86,100
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | 360,700 | 455,600 | 356,200
Other MI Companies |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | 1,100 | 100 | (2,800)
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | $ 41,300 | 45,700 | 58,000
Radian Title Insurance |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Number of States in which Entity Operates | state |  | 39 |  |
Statutory Accounting Practices, Statutory Net Income Amount |  | $ 2,100 | 300 | (1,800)
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  | $ 28,800 | $ 27,000 | $ 27,000
Radian Group Inc. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Marketable Securities | $ 200,000 |  |  |
Minimum | Radian Guaranty |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Surplus Note, Notice of Redemption Period | 30 days |  |  |
Differences Between GAAP Basis and SAPP Basis |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Mortgage Guaranty Insurance Companies Are Required Each Year To Establish A Contingency Reserve Equal To This Percentage Of Premiums Earned In Such Year |  | 50.00% |  |
Number of Years That a Contingency Reserve Must Be Maintained Under SAPP |  | 10 years |  |
Loss Ratio |  | 35.00% |  |
PENNSYLVANIA |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Number of Subsidiaries | subsidiaries |  | 2 |  |

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