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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
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 1,014,626 $ 1,040,455
Percentage of Total Fair Value 100.00% 100.00%
AAA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 297,475 $ 321,975
Percentage of Total Fair Value 29.30% 31.00%
AA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 154,975 $ 139,186
Percentage of Total Fair Value 15.30% 13.40%
A    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 327,427 $ 339,500
Percentage of Total Fair Value 32.30% 32.60%
BBB    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 232,316 $ 234,358
Percentage of Total Fair Value 22.90% 22.50%
No Rating Available    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 2,433 $ 5,436
Percentage of Total Fair Value 0.20% 0.50%