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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) $ in Thousands | Mar. 31, 2021 USD ($)
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Marketable Securities [Line Items] |
Estimated fair value, less than 12 months | $ 96,914
Estimated fair value, 12 months or more |
Estimated fair value, total | 96,914
Unrealized losses, less than 12 months | 885
Unrealized losses, 12 months or more |
Unrealized losses, total | 885
State and political subdivisions [Member] |
Marketable Securities [Line Items] |
Estimated fair value, less than 12 months | 36,423
Estimated fair value, 12 months or more |
Estimated fair value, total | 36,423
Unrealized losses, less than 12 months | 174
Unrealized losses, 12 months or more |
Unrealized losses, total | 174
U.S. government agencies [Member] |
Marketable Securities [Line Items] |
Estimated fair value, less than 12 months | 60,491
Estimated fair value, 12 months or more |
Estimated fair value, total | 60,491
Unrealized losses, less than 12 months | 711
Unrealized losses, 12 months or more |
Unrealized losses, total | $ 711

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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 twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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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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