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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
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense $ 145 $ 53 $ 28
Income tax benefit (49) (18) (10)
Net income effect $ 96 $ 35 $ 18