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Basis of Presentation (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Basis Of Presentation [Line Items] |  |  |
Unrealized loss on equity investments | $ 33,000 | $ 160,000 |
Accounting Standards Update 2016-01 [Member] |  |  |
Basis Of Presentation [Line Items] |  |  |
Reclassification of unrealized gains on AFS equity securities |  |  | $ 126,000
Unrealized gain on equity securities |  |  | 175,000
Unrealized gain on equity securities, tax |  |  | 49,000
Accounting Standards Update 2018-02 [Member] |  |  |
Basis Of Presentation [Line Items] |  |  |
Reclassification due to the adoption of ASU No. 2018-02 |  |  | $ 557,000

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- Definition Amount of unrealized gain (loss) on investments in equity securities classified as available-for-sale securities. + References No definition available. + Details
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