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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
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.