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v3.23.1

Reinsurance - Premium Details (Details) | Mar. 31, 2023
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Reinsurance Policy, Type [Axis]: Vintage Year 2017 | Panel of Reinsurers |
Effects of Reinsurance [Line Items] |
Risk margin increase after optional termination date | 50.00%

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- Definition Risk Margin Increase After Optional Termination Date + References No definition available. + Details
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Namespace Prefix: | esnt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ReinsuranceContractAxis=Vintage Year 2017
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=esnt_PanelOfReinsurersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |