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Investments - Debt Securities Available-for-sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt securities due February 2028
Investments, Debt and Equity Securities [Line Items]
Basis		$ 4,717
Gross unrealized losses		(6)
Fair value		4,711
Debt securities due November 2051
Investments, Debt and Equity Securities [Line Items]
Basis		3,764
Gross unrealized losses		(215)
Fair value		3,549
Debt securities due March 2060
Investments, Debt and Equity Securities [Line Items]
Basis	$ 3,822	5,805
Gross unrealized losses	(209)	(678)
Fair value	3,613	5,127
Debt securities due December 2060
Investments, Debt and Equity Securities [Line Items]
Basis	7,450	21,411
Gross unrealized losses	(2,805)	(4,242)
Fair value	4,645	17,169
Debt securities due January 2061
Investments, Debt and Equity Securities [Line Items]
Basis	4,886	4,886
Gross unrealized losses	(302)	(478)
Fair value	4,584	4,408
Debt securities due June 2061
Investments, Debt and Equity Securities [Line Items]
Basis	8,675	12,992
Gross unrealized losses	(662)	(1,243)
Fair value	8,013	11,749
Debt securities due October 2061
Investments, Debt and Equity Securities [Line Items]
Basis	6,255	11,815
Gross unrealized losses	(226)	(842)
Fair value	6,029	10,973
Debt securities due March 2062
Investments, Debt and Equity Securities [Line Items]
Basis	9,649	10,315
Gross unrealized losses	(434)	(793)
Fair value	9,215	9,522
Debt Securities Due July 2062
Investments, Debt and Equity Securities [Line Items]
Basis	12,197	12,668
Gross unrealized losses	(414)	(41)
Fair value	11,783	12,627
Debt Securities Due October 2062
Investments, Debt and Equity Securities [Line Items]
Basis		17,174
Gross unrealized losses		(137)
Fair value		17,037
Total basis
Investments, Debt and Equity Securities [Line Items]
Basis	52,934	105,547
Total gross unrealized losses
Investments, Debt and Equity Securities [Line Items]
Gross unrealized losses	(5,052)	(8,675)
Total carrying value (fair value)
Investments, Debt and Equity Securities [Line Items]
Fair value	$ 47,882	$ 96,872

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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