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Investments (Narrative) (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) security item | Dec. 31, 2020 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 545,788,000 | $ 396,940,000
Percent of shareholders equity benchmark for investments in a single issuer | 10.00% |
Number of debt securities | security | 204 | 102
Fair value of temporarily impaired securities | $ 234,800,000 | $ 82,950,000
Unrealized Losses | 3,465,000 | 701,000
Total unrealized loss position increased over prior year | 2,800,000 |
Equity securities | 473,000 | 391,000
Corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 24,956,000 | $ 20,288,000
Number of debt securities | security | 19 | 17
Fair value of temporarily impaired securities | $ 9,902,000 | $ 10,616,000
Unrealized Losses | 141,000 | 155,000
Public Funds And Trust Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 168,000,000.0 | 137,400,000
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of equity investments | item | 1 |
Equity securities | $ 473,000 | $ 391,000

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