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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
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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- 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

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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.

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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.

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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.

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+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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