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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Stock-Based Compensation [Abstract]  
Restricted Stock
The following table summarizes the stock grant amounts and activity for the years ended December 31, 2016 and 2017. 

  
Number of Shares
  
Grant Date Weighted
Average Fair Value
 
Nonvested at beginning of the year 2016
  
-
   
-
 
Granted
  
1,231
  
$
37.20
 
Vested
  
(571
)
 
$
37.20
 
Forfeited
  
-
   
-
 
Nonvested at end of the year 2016
  
660
  
$
37.20
 
Granted
  
1,505
  
$
38.00
 
Vested
  
(1,038
)
 
$
37.75
 
Forfeited
  
-
   
-
 
Nonvested at end of the year 2017
  
1,127
  
$
37.76
 

For the years ended December 31, 2017 and 2016, the statement of income includes $46 and $22 of stock based compensation and related recognized tax benefits of $18 and $9, respectively.  The total fair value of the shares vested in the years ended December 31, 2017 and 2016 was $39 and $21, respectively.  Total stock based compensation related to nonvested awards not yet recognized is $35 at December 31, 2017 which will be recognized over the remaining three year vesting period.