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