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Nature of Operations and Basis of Presentation (Details) - state				3 Months Ended
	Jan. 01, 2021	Dec. 31, 2020	Mar. 31, 2019	Mar. 31, 2022
Affiliated Entity | Essent Guaranty
Insurance Premium Revenue Recognition
Number of states in which the entity is licensed to write mortgage insurance				50
Affiliated Entity | Essent Re | Quota share reinsurance
Insurance Premium Revenue Recognition
Reinsurance percentage	35.00%	25.00%
Affiliated Entity | Essent PA | Reinsurance for mortgage insurance coverage in excess of 25%
Insurance Premium Revenue Recognition
Reinsurance for mortgage insurance coverage threshold (in excess of)			25.00%
Maximum
Insurance Premium Revenue Recognition
Residential mortgage down payment percentage for which mortgage insurance is generally required (less than)				20.00%

X

- Definition

Represents the percentage of the total sale price that a home buyer contributes in cash towards the purchase of a home for which mortgage insurance is generally required.

+ References

No definition available.

+ Details

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Namespace Prefix:	esnt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Threshold percentage of risk reinsured on insurance products per entity policy.

+ References

No definition available.

+ Details

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Namespace Prefix:	esnt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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X

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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X

- Definition

Percentage of risk reinsured on insurance products per entity policy.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=esnt_EssentGuarantyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=esnt_EssentReinsuranceLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=esnt_ExcessMortgageInsuranceCoverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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