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Stock-Based Compensation (Narrative) (Details) - 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 $ 382 $ 314 $ 328
Grant date fair value of vested Restricted Stock 375 $ 303  
Unrecognized compensation cost related to unvested Restricted Stock $ 69    
Weighted-average period for unrecognized compensation cost to be recognized 1 year    
Restricted Stock [Member] | Outside Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting service period of grants 9 months    
Restricted Stock [Member] | Executive Officers [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting service period of grants 3 years    
Deferred Compensation Arrangement with Individual, Requisite Service Period 1 year