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Investments - Revenue Bonds by Type (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | $ 223,224 | $ 372,313
Fair market value (available-for-sale securities and held-to-maturity securities) | 219,810 | 372,371
Revenue Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 25,472 | 47,634
Fair market value (available-for-sale securities and held-to-maturity securities) | 25,190 | 47,728
Revenue Bonds [Member] | Water [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 9,211 | 19,113
Fair market value (available-for-sale securities and held-to-maturity securities) | 9,064 | 19,158
Revenue Bonds [Member] | Sewer [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 3,607 | 6,070
Fair market value (available-for-sale securities and held-to-maturity securities) | 3,760 | 6,312
Revenue Bonds [Member] | Lease [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 3,932 | 6,323
Fair market value (available-for-sale securities and held-to-maturity securities) | 4,210 | 6,380
Revenue Bonds [Member] | Sales Tax [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 1,690 | 4,349
Fair market value (available-for-sale securities and held-to-maturity securities) | 1,630 | 4,010
Revenue Bonds [Member] | Other Revenue Source [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 6,000 | 11,779
Fair market value (available-for-sale securities and held-to-maturity securities) | 5,674 | $ 11,868
Revenue Bonds [Member] | Local Or Guaranteed Housing [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 1,032 |
Fair market value (available-for-sale securities and held-to-maturity securities) | $ 852 |

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