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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
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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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