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Significant Accounting Polices - Securities Lending (Details) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Requiring percentage, collateral | 102.00%
Requiring collateral percentage, minimum | 100.00%

X
- Definition The minimum percentage of collateral maintained per the lending policy for the duration of the loan. + References No definition available. + Details
Name: | erie_SecuritiesLendingAgreementsRequiringCollateralPercentageMinimum
Namespace Prefix: | erie_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The collateral percentage required by the lending policy for the fair value of the securities loaned. + References No definition available. + Details
Name: | erie_SecuritiesLendingAgreementsRequiringPercentageCollateral
Namespace Prefix: | erie_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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