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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, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,014,626 | $ 1,040,455
Percentage of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 297,475 | $ 321,975
Percentage of Total Fair Value | 29.30% | 31.00%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 154,975 | $ 139,186
Percentage of Total Fair Value | 15.30% | 13.40%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 327,427 | $ 339,500
Percentage of Total Fair Value | 32.30% | 32.60%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 232,316 | $ 234,358
Percentage of Total Fair Value | 22.90% | 22.50%
No Rating Available |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 2,433 | $ 5,436
Percentage of Total Fair Value | 0.20% | 0.50%

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