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v3.20.2

Note 11 - Losses and Loss Adjustment Expense - Reserve Activity (Details) - Mortgage segment - payment | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Minimum |  |  |
Number of missed payments | 2 |  |
Primary Mortgage Product |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults | 8.50% | 7.50% | 7.50%

X
- 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: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of missed payments + References No definition available. + Details
Name: | rdn_NumberOfMissedPayments
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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