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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, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 1,276,732 $ 1,064,330
% of Total Fair Value 100.00% 100.00%
AAA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 385,954 $ 333,516
% of Total Fair Value 30.20% 31.30%
AA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 143,512 $ 128,249
% of Total Fair Value 11.20% 12.00%
A    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 430,319 $ 356,090
% of Total Fair Value 33.70% 33.50%
BBB    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 311,096 $ 245,823
% of Total Fair Value 24.40% 23.10%
No Rating Available    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 5,851 $ 652
% of Total Fair Value 0.50% 0.10%