Related Party (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021 USD ($) affiliate insurer	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related party transactions
Management fee rate as a percent of direct and affiliated assumed written premiums of the exchange		25.00%
Minimum number of affiliates to be classified as an insurance holding company system | affiliate		2
Minimum number of insurer affiliates to be classified as an insurance holding company system | insurer		1
Total operating revenue		$ 2,633,977	$ 2,536,489	$ 2,477,298
Service agreement revenue
Related party transactions
Total operating revenue		$ 24,042	$ 25,797	$ 27,627
Erie Insurance Exchange (EIE)
Related party transactions
Management fee rate as a percent of direct and affiliated assumed written premiums of the exchange		25.00%	25.00%	25.00%
Lease expense on office space leased from exchange		$ 6,100	$ 6,100	$ 6,100
Operating expenses on office space leased from exchange		15,700	15,700	16,700
Reimbursements from the Exchange for lease costs and related operating expenses		4,800	$ 4,600	$ 4,200
Erie Insurance Exchange (EIE) | Service agreement revenue
Related party transactions
Total operating revenue		$ 200
Erie Insurance Exchange (EIE) | Forecast
Related party transactions
Management fee rate as a percent of direct and affiliated assumed written premiums of the exchange	25.00%