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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment income from portfolios      
Investment income $ 31,214 $ 35,120 $ 30,412
Less: investment expenses 1,461 1,061 1,025
Net investment income 29,753 34,059 29,387
Available-for-sale securities      
Investment income from portfolios      
Available-for-sale securities and equity securities investment income 22,631 22,496 24,978
Equity securities      
Investment income from portfolios      
Available-for-sale securities and equity securities investment income 4,147 1,418 628
Cash equivalents and other      
Investment income from portfolios      
Investment income $ 4,436 $ 11,206 4,806
Erie Family Life Insurance Company (EFL)      
Investment income from portfolios      
Note receivable from EFL, interest income recognized by Indemnity     $ 1,600