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Reinsurance - Excess of Loss Reinsurance (Details) - agreement	1 Months Ended	9 Months Ended
	Apr. 30, 2025	Sep. 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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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.

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-Name Regulation S-X (SX)
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Percentage of risk undertaken originally by insurer ceded to reinsurer.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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