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Share-Based Compensation (Summary of Restricted Stock Activity) (Details) - Restricted Stock Units [Member] - $ / shares
1 Months Ended 12 Months Ended
Dec. 31, 2018
Nov. 30, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
May 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Number of shares                
Beginning balance             82,280 95,000
Restricted stock granted   10,666 5,136 9,530 7,500 6,780 25,332 14,280
Restricted stock vested (25,000)   (2,260)          
Restricted stock forfeited               (27,000)
Ending balance 80,352           80,352 82,280
Weighted-average grant-date fair value                
Beginning balance             $ 15.45 $ 14.75
Restricted stock granted   $ 19.46 $ 24.20 $ 26.23 $ 20.29 $ 18.00    
Restricted stock vested $ 14.75   $ 18.00          
Restricted stock forfeited               14.96
Ending balance $ 17.97           $ 17.97 $ 15.45