Significant Accounting Policies (Details)	9 Months Ended
Sep. 30, 2024
Accounting Policies [Abstract]
Securities lending agreements, requiring percentage, collateral	102.00%
Securities lending agreements, requiring collateral percentage, minimum	100.00%

The minimum percentage of collateral maintained per the lending policy for the duration of the loan.

No definition available.

Name:	erie_SecuritiesLendingAgreementsRequiringCollateralPercentageMinimum
Namespace Prefix:	erie_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration