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Note 16 - Statutory Information - Statutory Information (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Statutory Accounting Practices [Line Items] |  |  |
PMIERS Disaster Related Capital Charge |  | 30.00% |
Reduction in Capital Charges |  | 70.00% |
Maximum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Number of Months that Disaster Related Capital Charge is Applied. |  | 3 months |
Radian Guaranty |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Surplus Note | $ 200.0 | $ 300.0 | $ 100.0
Related Party Transaction, Rate | 3.00% |  |
Surplus Note, Notice of Redemption Period | 30 days |  |
Radian Reinsurance |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Risk In Force | $ 6,000.0 |  |
Return of capital | 465.0 |  |
Radian Group Inc. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Marketable Securities | $ 200.0 |  |
Consolidated insurance subsidiaries |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Restricted Net Assets Held by Consolidated Subsidiaries |  | $ 4,000.0 |

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- Definition PMIERS Disaster Related Capital Charge + References No definition available. + Details
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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486086&loc=d3e24387-158525 + Details
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