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Investments (Held-to_Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 3,040 | $ 3,857
Gross Unrealized Losses | (1) | (2)
Fair Value | 3,039 | 3,855
Corporate bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 513 | 1,560
Gross Unrealized Losses | (1) | (1)
Fair Value | 512 | 1,559
Municipal Bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 2,527 | 2,297
Gross Unrealized Losses |  | (1)
Fair Value | $ 2,527 | $ 2,296

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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