Concentrations of Credit Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Concentration Risk [Line Items]
Receivables from Erie Insurance Exchange and affiliates, net	$ 780,473	$ 707,060
Receivables from Erie Insurance Exchange, allowance for credit loss	700	700
Affiliated Entity
Concentration Risk [Line Items]
Receivables from Erie Insurance Exchange and affiliates, net	$ 780,500	$ 707,100