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Investments - Schedule of Credit Quality of Investment Securities With Contractual Maturities or The Issuer of Such Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,064,330 | $ 1,014,626
Percentage of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 333,516 | $ 297,475
Percentage of Total Fair Value | 31.30% | 29.30%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 128,249 | $ 154,975
Percentage of Total Fair Value | 12.00% | 15.30%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 356,090 | $ 327,427
Percentage of Total Fair Value | 33.50% | 32.30%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 245,823 | $ 232,316
Percentage of Total Fair Value | 23.10% | 22.90%
No Rating Available |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 652 | $ 2,433
Percentage of Total Fair Value | 0.10% | 0.20%

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