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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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