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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, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 1,031,558 $ 1,014,626
% of Total Fair Value 100.00% 100.00%
AAA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 312,769 $ 297,475
% of Total Fair Value 30.30% 29.30%
AA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 130,994 $ 154,975
% of Total Fair Value 12.70% 15.30%
A    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 346,486 $ 327,427
% of Total Fair Value 33.60% 32.30%
BBB    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 240,563 $ 232,316
% of Total Fair Value 23.30% 22.90%
No Rating Available    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 746 $ 2,433
% of Total Fair Value 0.10% 0.20%