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Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of fair value on recurring item basis - Recurring [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair value | $ 477,880 | $ 501,342
Municipal Securities [Member] |  |
Fair value | $ 8,636 | $ 8,844
Valuation Techniques | Discounted cash flows | Discounted cash flows
Unobservable Input | Discount rate | Discount rate
Rate | 2.90% | 2.90%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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