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Investments - Schedule of Credit Quality of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 921,800	$ 819,861
% of Total Fair Value	100.00%	100.00%
AAA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 316,826	$ 337,462
% of Total Fair Value	34.40%	41.20%
AA
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 130,445	$ 89,681
% of Total Fair Value	14.10%	10.90%
A
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 275,345	$ 230,290
% of Total Fair Value	29.90%	28.10%
BBB
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 197,939	$ 160,662
% of Total Fair Value	21.50%	19.60%
BB and Below
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 0	$ 233
% of Total Fair Value	0.00%	0.00%
No Rating Available
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,245	$ 1,533
% of Total Fair Value	0.10%	0.20%

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