Significant Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agent loans, allowance for credit loss		$ 1,000	$ 1,000
Receivables from Erie Insurance Exchange, allowance for credit loss		600	500
Cumulative effect adjustment		1,448,408	1,342,478	$ 1,188,048			$ 1,133,253
Available-for-sales securities, allowance for credit loss		$ 200	$ 100		$ 600
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	[1]						(1,075)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agent loans, allowance for credit loss						$ 800
Receivables from Erie Insurance Exchange, allowance for credit loss						600
Cumulative effect adjustment							$ 1,100
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | Erie Insurance Exchange (EIE)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables from Erie Insurance Exchange, allowance for credit loss						$ 600

[1] The cumulative effect adjustment in 2020 is related to the implementation of credit loss allowance accounting guidance effective January 1, 2020. See Note 2, "Significant Accounting Policies."