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v3.21.2

Note 11 - Losses and LAE - Reserve Activity (Details) - Primary Mortgage Product - Mortgage segment | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Apr. 30, 2021
Decrease in Number of New Primary Default Notices | (70.00%) |
Default To Claim Rate Estimate, Gross, For New Defaults | 8.00% | 8.50%

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- Definition This concept represents the rate at which newly reported defaulted loans are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimRateEstimateGrossForNewDefaults
Namespace Prefix: | rdn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage Change in Number of New Primary Default Notices + References No definition available. + Details
Name: | rdn_PercentageChangeInNumberOfNewPrimaryDefaultNotices
Namespace Prefix: | rdn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=rdn_PrimaryMortgageProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rdn_MortgageInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |