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Schedule II Financial Information of Registrant - Parent Company Only Supplemental Notes (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) transaction | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |
Total Operating Expenses Allocated to Subsidiaries From Parent Company | $ 129,870 | $ 124,412 | $ 94,815
Total Interest Expense Allocated to Subsidiaries From Parent Company | 68,938 | 53,692 | 42,195
Supplemental Notes [Abstract] |  |  |
Deferred Income Tax Liabilities, Net | 213,897 | 71,084 |
Parent Company |  |  |
Supplemental Notes [Abstract] |  |  |
Total Operating Expenses and Interest Expense Allocated to Subsidiaries From Parent Company | 198,808 | 178,104 | 137,010
Deferred Income Tax Liabilities, Net | 272,868 | 253,739 |
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) | 116,800 |  |
Radian Mortgage Assurance |  |  |
Supplemental Notes [Abstract] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required | 5,000 |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 8,700 |  |
Risk In Force | 0 |  |
Radian Guaranty |  |  |
Supplemental Notes [Abstract] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 481,500 | $ 637,700 | $ 814,100
Indirect Guarantee of Indebtedness | Radian Guaranty |  |  |
Supplemental Notes [Abstract] |  |  |
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction | 2 |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 73,200 |  |

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