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Stock-Based Compensation (Summary of Restricted Stock Activity) (Details) - $ / shares | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
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Stock-Based Compensation [Abstract] |  |  |
Restricted stock Non-vested, beginning balance | 36,195 | 34,615 | 34,615
Restricted stock Non-vested, ending balance | 36,195 | 36,195 | 34,615
Restricted stock Non-vested, weighted-average grant date fair value, beginning balance | $ 31.65 | $ 27.82 | $ 27.82
Restricted stock Non-vested, weighted-average grant date fair value, ending balance | $ 31.65 | $ 31.65 | $ 27.82

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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