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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 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 842,574 | $ 855,284
Percentage of Total Fair Value | 100.00% | 100.00%
AAA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 368,845 | $ 372,442
Percentage of Total Fair Value | 43.80% | 43.60%
AA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 74,964 | $ 99,103
Percentage of Total Fair Value | 8.90% | 11.60%
A [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 223,658 | $ 238,766
Percentage of Total Fair Value | 26.60% | 27.90%
BBB [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 172,916 | $ 143,889
Percentage of Total Fair Value | 20.50% | 16.80%
BB and Below [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,198 | $ 0
Percentage of Total Fair Value | 0.10% | 0.00%
Not Rated Available [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 993 | $ 1,084
Percentage of Total Fair Value | 0.10% | 0.10%

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