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Investments - Schedule of Credit Quality of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,029,157 | $ 819,861
% of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 330,344 | $ 337,462
% of Total Fair Value | 32.10% | 41.20%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 143,806 | $ 89,681
% of Total Fair Value | 14.00% | 10.90%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 315,761 | $ 230,290
% of Total Fair Value | 30.70% | 28.10%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 229,208 | $ 160,662
% of Total Fair Value | 22.20% | 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 | $ 10,038 | $ 1,533
% of Total Fair Value | 1.00% | 0.20%

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