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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, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,014,677	$ 1,040,455
% of Total Fair Value	100.00%	100.00%
AAA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 309,960	$ 321,975
% of Total Fair Value	30.50%	31.00%
AA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 139,554	$ 139,186
% of Total Fair Value	13.80%	13.40%
A
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 330,751	$ 339,500
% of Total Fair Value	32.60%	32.60%
BBB
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 227,901	$ 234,358
% of Total Fair Value	22.50%	22.50%
No Rating Available
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 6,511	$ 5,436
% of Total Fair Value	0.60%	0.50%