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Investments - Held-To-Maturity by Credit Rating (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total | $ 316,422 | $ 320,073
States and Political Subdivisions [Member] |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total | 172,164 | 172,256
States and Political Subdivisions [Member] | Fitch, AAA Rating [Member] |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total | 57,781 | 57,792
States and Political Subdivisions [Member] | Fitch, AA Rating [Member] |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total | 112,901 | 112,978
States and Political Subdivisions [Member] | Fitch, A Rating [Member] |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total | 540 | 542
States and Political Subdivisions [Member] | Not Rated [Member] |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
Total | $ 942 | $ 944

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