Concentrations of Credit Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Concentration Risk [Line Items]
Receivables from Erie Insurance Exchange and affiliates, net	$ 743,236	$ 735,589
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	$ 743,200	$ 735,600