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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Sep. 30, 2020 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 110
Estimated fair value, less than 12 months of temporary impairment | $ 218,960
Unrealized losses, less than 12 months of temporary impairment | (170)
Estimated fair value, more than 12 months of temporary impairment | 7,000
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 225,960
Unrealized losses, total temporary impairment | $ (170)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 54
Estimated fair value, less than 12 months of temporary impairment | $ 104,736
Unrealized losses, less than 12 months of temporary impairment | (99)
Estimated fair value, more than 12 months of temporary impairment | 0
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 104,736
Unrealized losses, total temporary impairment | $ (99)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 4
Estimated fair value, less than 12 months of temporary impairment | $ 37,963
Unrealized losses, less than 12 months of temporary impairment | (32)
Estimated fair value, more than 12 months of temporary impairment | 7,000
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 44,963
Unrealized losses, total temporary impairment | $ (32)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 5
Estimated fair value, less than 12 months of temporary impairment | $ 55,273
Unrealized losses, less than 12 months of temporary impairment | (13)
Estimated fair value, more than 12 months of temporary impairment | 0
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 55,273
Unrealized losses, total temporary impairment | $ (13)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 45
Estimated fair value, less than 12 months of temporary impairment | $ 14,719
Unrealized losses, less than 12 months of temporary impairment | (3)
Estimated fair value, more than 12 months of temporary impairment | 0
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 14,719
Unrealized losses, total temporary impairment | $ (3)
Other Municipal Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 2
Estimated fair value, less than 12 months of temporary impairment | $ 6,269
Unrealized losses, less than 12 months of temporary impairment | (23)
Estimated fair value, more than 12 months of temporary impairment | 0
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 6,269
Unrealized losses, total temporary impairment | $ (23)

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