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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Shares awarded to non-employee directors [Line Items]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The table below presents the amounts included in net income related to share-based compensation expense for the three months ended March 31, 2017 and 2016:
 
 
 
Three Months Ended
 
 
March 31,
 
 
2017
 
2016
(in thousands)
 
 
 
 
Awards to non-employee directors
 
$
135

 
$
165

Awards to key employees
 
504

 
484

Total compensation expense
 
639

 
649

Less: tax benefit
 
(257
)
 
(261
)
Share-based compensation amounts included in net income
 
$
382

 
$
388
Schedule of Share-based Compensation, Nonemployee Director Stock Award Plan, Activity [Table Text Block]
Award to key employees [Member]  
Shares awarded to non-employee directors [Line Items]  
Schedule of Share-based Compensation, Activity
The table below presents the summary of the stock activity for awards to key employees for the three months ended March 31, 2017:
 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding— December 31, 2016
 
115,091

 
$
51.85

Granted
 
38,517

 
$
62.08

Vested
 
(32,926
)
 
$
38.88

Expired
 
(1,878
)
 
$
39.97

Outstanding— March 31, 2017
 
118,804

 
$
56.03