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Reinsurance - Excess of Loss Reinsurance (Details) - agreement | 1 Months Ended | 6 Months Ended
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Apr. 30, 2025 | Jun. 30, 2025
Essent Guaranty | Reinsurance Policy, Type [Axis]: Calendar Years 2025 And 2026 |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Number of reinsurance agreements | 2 |
Reinsurance percentage | 20.00% |
VIE | Reinsurance Policy, Type [Axis]: Mortgage Insurance | 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
VIE | Radnor Re | Reinsurance Policy, Type [Axis]: Mortgage Insurance |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Amortization period |  | 10 years

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