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Investments - Held to Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | $ 34,819 | $ 45,159
Gross Unrealized Gains | 4 | 20
Gross Unrealized Losses | (26) | (41)
Estimated Fair Value | 34,797 | 45,138
Accrued Interest | 443 | 266
US Treasury bills and notes |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 10,661 | 20,423
Gross Unrealized Gains | 0 | 6
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 10,660 | 20,429
Accrued Interest | 45 | 14
Corporate debt securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 21,158 | 21,736
Gross Unrealized Gains | 4 | 14
Gross Unrealized Losses | (25) | (33)
Estimated Fair Value | 21,137 | 21,717
Accrued Interest | 311 | 209
Yankee debt securities |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized Cost | 3,000 | 3,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (8)
Estimated Fair Value | 3,000 | 2,992
Accrued Interest | $ 87 | $ 43

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