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Reinsurance - Excess of Loss Reinsurance Narrative (Details) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2023 | Sep. 30, 2023
Radnor Re 2019-1 Ltd. |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Retired percent | 90.00% |
Radnor Re 2020-1 Ltd. |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Retired percent | 90.00% |
Reinsurance Policy, Type [Axis]: Mortgage Insurance | Other Reinsurance | Essent Guaranty |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Amortization period |  | 10 years
Reinsurance Policy, Type [Axis]: Mortgage Insurance | VIE | Mortgage Insurance Linked Notes | Radnor Re |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Reinsurance retention policy, debt issued to cover insurance, term |  | 10 years
Reinsurance Policy, Type [Axis]: Mortgage Insurance | VIE | Radnor Re |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Amortization period |  | 10 years

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