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Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Investments [Abstract] |  |
Amortized cost, Due in less than one year | $ 29,938 |
Estimated fair value, Due in less than one year | 30,020 |
Amortized cost, Due after one year but within five years | 232,658 |
Estimated fair value, Due after one year but within five years | 235,528 |
Amortized cost, Due after five years but within ten years | 52,948 |
Estimated fair value, Due after five years but within ten years | 55,177 |
Amortized cost, Due after ten years | 55,144 |
Estimated fair value, Due after ten years | 57,793 |
Amortized cost, Total | 370,688 | $ 284,758
Estimated fair value, Total | $ 378,518 | $ 297,270

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