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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) item security | Dec. 31, 2023 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 462,951 | $ 472,503
Number of investments in a single issuer exceeds 10% of shareholders' equity | item | 0 |
Percent of shareholders equity benchmark for investments in a single issuer | 10.00% |
Number of debt securities | security | 550 | 564
Fair value of temporarily impaired securities | $ 437,497 | $ 458,186
Unrealized Losses | 49,987 | 49,554
Equity securities | 386 | 427
Corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 23,452 | $ 23,198
Number of debt securities | security | 50 | 51
Fair value of temporarily impaired securities | $ 22,470 | $ 23,198
Unrealized Losses | 2,890 | 3,138
Public Funds And Trust Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 204,400 | $ 207,400
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of equity investments | item | 1 |

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