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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 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,215,630 | $ 1,064,330
% of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 372,446 | $ 333,516
% of Total Fair Value | 30.60% | 31.30%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 144,142 | $ 128,249
% of Total Fair Value | 11.90% | 12.00%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 411,218 | $ 356,090
% of Total Fair Value | 33.80% | 33.50%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 283,267 | $ 245,823
% of Total Fair Value | 23.30% | 23.10%
No Rating Available |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 4,557 | $ 652
% of Total Fair Value | 0.40% | 0.10%

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