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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, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 913,131	$ 819,861
% of Total Fair Value	100.00%	100.00%
AAA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 326,429	$ 337,462
% of Total Fair Value	35.70%	41.20%
AA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 109,334	$ 89,681
% of Total Fair Value	12.00%	10.90%
A
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 287,372	$ 230,290
% of Total Fair Value	31.50%	28.10%
BBB
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 188,371	$ 160,662
% of Total Fair Value	20.60%	19.60%
BB and Below
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 227	$ 233
% of Total Fair Value	0.00%	0.00%
No Rating Available
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,398	$ 1,533
% of Total Fair Value	0.20%	0.20%

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Amount of available for sale securities with contractual maturities.

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