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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,031,558 | $ 1,014,626
% of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 312,769 | $ 297,475
% of Total Fair Value | 30.30% | 29.30%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 130,994 | $ 154,975
% of Total Fair Value | 12.70% | 15.30%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 346,486 | $ 327,427
% of Total Fair Value | 33.60% | 32.30%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 240,563 | $ 232,316
% of Total Fair Value | 23.30% | 22.90%
No Rating Available |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 746 | $ 2,433
% of Total Fair Value | 0.10% | 0.20%

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