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Common Stock (Schedule of Compensation Expense and Related Tax Benefits for Restricted Stock Awards Recognized) (Details) - 2014 Restricted Stock Plan [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense | $ 414 | $ 346 | $ 267
Income tax benefit | (87) | (73) | (56)
Net income effect | $ 327 | $ 273 | $ 211

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