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Summary of Significant Accounting Policies - Insurance Premium Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Earned premiums from mortgage guaranty insurance monthly policies as a percentage of total earned premiums	94.00%
Threshold coverage period for single premium primary mortgage insurance policies (more than)	1 year
Unearned single premium recognized as earned upon notice of policy cancellation due to repayment of insured loan by borrower	$ 20.8	$ 63.8

X

- Definition

Represents the earned premium during the period from mortgage guaranty insurance contracts which provide for monthly payments as a percentage of total earned premium.

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No definition available.

+ Details

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

X

- Definition

Represents, for single premium primary mortgage insurance policies with a nonrefundable premium, the total amount of unearned premium recognized as earned premium upon notification of cancellation due to repayment of the insured loan by the borrower.

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No definition available.

+ Details

Name:	esnt_NonRefundableSinglePremiumPrimaryMortgageInsuranceUnearnedPremiumRecognizedAsEarnedUponCancellationDueToLoanRepayment
Namespace Prefix:	esnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	esnt_PrimaryMortgageGuarantyInsuranceContractsSinglePremiumPolicesMinimumPeriod
Namespace Prefix:	esnt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration