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Investments - Summary of Information Relating to Investments Measured at Fair Value for Company has Used Unobservable Inputs to Determine Fair Value (Parenthetical) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers out of Level III | $ 7,018 | [1] | $ 8,332 | [2]
Transfers into Level III | 4,514 | [3] | 6,369 | [4]
Debt securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers out of Level III | 7,000 |  | 8,300 |
Transfers into Level III | $ 4,500 |  | $ 6,400 |
[1] | Transfers out of Level III represent a transfer of $7.0 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2024.
[2] | Transfers out of Level III represent a transfer of $8.3 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2023.
[3] | Transfers into Level III represent a transfer of $4.5 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2024.
[4] | Transfers into Level III represent a transfer of $6.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2023.

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