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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, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers out of Level III $ 8,332 [1] $ 13,988 [2]
Transfers into Level III 6,369 [3] 5,351 [4]
Debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers out of Level III 8,332 [1] 13,988 [2]
Transfers into Level III $ 6,369 [3] $ 5,351 [4]
[1] 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.
[2] Transfers out of Level III represent a transfer of $14.0 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2022.
[3] 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.
[4] Transfers into Level III represent a transfer of $5.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2022.