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Employee Benefit Plans (Restricted Stock Awards Activity) (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares granted 38,400 44,016
Average grant date fair value (in usd per share) $ 16.36 $ 11.21