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Investments (Narrative) (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) security item | Dec. 31, 2023 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 454,465 | $ 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 | 551 | 564
Fair value of temporarily impaired securities | $ 437,039 | $ 458,186
Unrealized Losses | 49,563 | 49,554
Equity securities | 352 | 427
Corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 23,688 | $ 23,198
Number of debt securities | security | 167 | 51
Fair value of temporarily impaired securities | $ 23,688 | $ 23,198
Unrealized Losses | 2,658 | 3,138
Public Funds And Trust Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 231,000 | $ 207,400
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of equity investments | item | 1 |

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