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Stock Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following summarizes the status of Restricted Stock and changes during the six months ended June 30, 2018:
 
Number of
Shares
 
Weighted Average
Grant Date
Fair Value
Unvested balance at December 31, 2017
141,095

 
$
16.79

Granted
156,953

 
15.51

Vested
(77,318
)
 
16.31

Forfeited
(1,702
)
 
22.68

Unvested balance at June 30, 2018
219,028

 
$
16.00