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Stock-Based Compensation (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
employee
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
May 16, 2017
shares
May 18, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized       150,000 50,000
Number of plan participants | employee 22        
Pre-tax compensation expense | $ $ 545,000 $ 391,000 $ 333,000    
Unrecognized compensation cost | $ $ 1,432,000        
Unrecognized compensation cost, recognition period 3 years 9 months 18 days        
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting year 2020        
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting year 2023        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted 7,837 3,162 5,779    
Shares vested 6,492 1,284 2,570