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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
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 1,215,630 $ 1,064,330
% of Total Fair Value 100.00% 100.00%
AAA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 372,446 $ 333,516
% of Total Fair Value 30.60% 31.30%
AA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 144,142 $ 128,249
% of Total Fair Value 11.90% 12.00%
A    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 411,218 $ 356,090
% of Total Fair Value 33.80% 33.50%
BBB    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 283,267 $ 245,823
% of Total Fair Value 23.30% 23.10%
No Rating Available    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 4,557 $ 652
% of Total Fair Value 0.40% 0.10%