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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	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,026,555	$ 1,014,626
% of Total Fair Value	100.00%	100.00%
AAA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 304,913	$ 297,475
% of Total Fair Value	29.70%	29.30%
AA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 158,404	$ 154,975
% of Total Fair Value	15.40%	15.30%
A
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 334,519	$ 327,427
% of Total Fair Value	32.60%	32.30%
BBB
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 227,056	$ 232,316
% of Total Fair Value	22.10%	22.90%
No Rating Available
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,663	$ 2,433
% of Total Fair Value	0.20%	0.20%