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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Mar. 31, 2021 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 414
Estimated fair value, less than 12 months of temporary impairment | $ 435,239
Unrealized losses, less than 12 months of temporary impairment | $ (596)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 101
Estimated fair value, less than 12 months of temporary impairment | $ 233,665
Unrealized losses, less than 12 months of temporary impairment | $ (321)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 7
Estimated fair value, less than 12 months of temporary impairment | $ 60,681
Unrealized losses, less than 12 months of temporary impairment | $ (166)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 6
Estimated fair value, less than 12 months of temporary impairment | $ 52,838
Unrealized losses, less than 12 months of temporary impairment | $ (35)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 297
Estimated fair value, less than 12 months of temporary impairment | $ 76,712
Unrealized losses, less than 12 months of temporary impairment | $ (47)
Other Municipal Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 3
Estimated fair value, less than 12 months of temporary impairment | $ 11,343
Unrealized losses, less than 12 months of temporary impairment | $ (27)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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