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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable Securities [Line Items] |  |
Estimated fair value, less than 12 months |  | $ 3,801
Estimated fair value, 12 months or more |  | 17,593
Estimated fair value, total |  | 21,394
Unrealized losses, less than 12 months |  | 12
Unrealized losses, 12 months or more |  | 157
Unrealized losses, total |  | 169
State and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Estimated fair value, less than 12 months |  |
Estimated fair value, 12 months or more |  |
Estimated fair value, total |  |
Unrealized losses, less than 12 months |  |
Unrealized losses, 12 months or more |  |
Unrealized losses, total |  |
U.S. government agencies [Member] |  |
Marketable Securities [Line Items] |  |
Estimated fair value, less than 12 months |  | 3,801
Estimated fair value, 12 months or more |  | 17,593
Estimated fair value, total |  | 21,394
Unrealized losses, less than 12 months |  | 12
Unrealized losses, 12 months or more |  | 157
Unrealized losses, total |  | 169
Certificates of Deposit [Member] |  |
Marketable Securities [Line Items] |  |
Estimated fair value, less than 12 months |  |
Estimated fair value, 12 months or more |  |
Estimated fair value, total |  |
Unrealized losses, less than 12 months |  |
Unrealized losses, 12 months or more |  |
Unrealized losses, total |  |

X
- 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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X
- 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=121645371&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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 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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