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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 | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 855,284 | $ 820,438
Percentage of Total Fair Value | 100.00% | 100.00%
AAA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 372,442 | $ 388,672
Percentage of Total Fair Value | 43.60% | 47.40%
AA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 99,103 | $ 100,791
Percentage of Total Fair Value | 11.60% | 12.30%
A [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 238,766 | $ 214,503
Percentage of Total Fair Value | 27.90% | 26.10%
BBB [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 143,889 | $ 112,613
Percentage of Total Fair Value | 16.80% | 13.70%
BB and Below [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 0 | $ 494
Percentage of Total Fair Value | 0.00% | 0.10%
No Rating Available [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,084 | $ 3,365
Percentage of Total Fair Value | 0.10% | 0.40%

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