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Statutory Information - Narrative (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) state subsidiary | Feb. 28, 2022 USD ($) | Dec. 31, 2022 USD ($) state subsidiary | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2022 USD ($)
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Return of capital | $ 282,000 | $ 282,000 |  |  |  |  |
Prepaid taxes |  | $ 596,368 |  | $ 596,368 | $ 354,123 |  |
Original maturity of bonds |  |  |  | 10 years |  |  |
Risk-to-capital ratio maximum |  | 25 |  | 25 |  |  |
Restricted net assets held by consolidated subsidiaries |  | $ 4,300,000 |  | $ 4,300,000 |  |  |
Distributions from Radian Guaranty |  |  |  | $ 882,000 |  |  |
Credit Risk Transfer Transactions |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
RIF |  |  |  |  |  |  | $ 276,000
Radian Guaranty |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Number of states operated in | state |  | 50 |  | 50 |  |  |
Return of capital |  |  | $ 500,000 | $ 782,000 |  |  |
Risk-to-capital ratio |  | 10.7 |  | 10.7 | 11.1 |  |
Unassigned surplus |  | $ 258,500 |  | $ 258,500 | $ (562,800) |  |
Contingency reserve |  | $ 4,400,000 |  | 4,400,000 | 3,900,000 |  |
Distributions from Radian Guaranty |  |  |  | $ 881,979 | $ 0 | $ 0 |
Radian Reinsurance |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Admitted assets |  |  |  |  |  |  | $ 325,000
Radian Title Insurance |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Number of states operated in | state |  | 41 |  | 41 |  |  |
Differences Between GAAP Basis and SAP 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 |  | 1 |  | 1 |  |  |
State Insurance Regulations |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Number of states with RBC requirement | state |  | 16 |  | 16 |  |  |
Non RBC States | Minimum |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Statutory capital requirements for non-RBC states |  | $ 1,000 |  | $ 1,000 |  |  |
Non RBC States | Maximum |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |
Statutory capital requirements for non-RBC states |  | $ 5,000 |  | $ 5,000 |  |  |

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