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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, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,040,455	$ 819,861
Percentage of Total Fair Value	100.00%	100.00%
AAA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 321,975	$ 337,462
Percentage of Total Fair Value	31.00%	41.20%
AA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 139,186	$ 89,681
Percentage of Total Fair Value	13.40%	10.90%
A
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 339,500	$ 230,290
Percentage of Total Fair Value	32.60%	28.10%
BBB
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 234,358	$ 160,662
Percentage of Total Fair Value	22.50%	19.60%
BB and Below
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 0	$ 233
Percentage of Total Fair Value	0.00%	0.00%
No Rating Available
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 5,436	$ 1,533
Percentage of Total Fair Value	0.50%	0.20%

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Amount of available for sale securities with contractual maturities.

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