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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, 2024 USD ($) payment | Dec. 31, 2023 USD ($)
Accounting Policies [Abstract] |  |
Number of consecutive missed loan payments by borrower for classification of insured loan as in default | payment | 2 |
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_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration