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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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