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Summary of Significant Accounting Policies - Reserve for Losses and Loss Adjustment Expense and Premium Deficiency Reserve (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) payment	Dec. 31, 2021 USD ($)
Reserve for Losses and Loss Adjustment Expenses
Number of consecutive missed loan payments by borrower for classification of insured loan as in default | payment	2
Premium Deficiency Reserve
Premium deficiency reserve | $	$ 0	$ 0

X

- Definition

Represents, for purposes of establishing loss reserves for future claims on insured loans, the number of consecutive payments missed by the borrower for classification of the loan as in default.

+ References

No definition available.

+ Details

Name:	esnt_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNumberOfConsecutiveMissedLoanPaymentsForClassificationOfLoanAsInDefault
Namespace Prefix:	esnt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of reserve for the excess of the net present value of expected future losses and expenses for a particular group of policies over the net present value of expected future premium, anticipated investment income and existing reserves for that specified group of policies.

+ References

No definition available.

+ Details

Name:	esnt_PremiumDeficiencyReserve
Namespace Prefix:	esnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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