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Share Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Share Based Compensation [Abstract]            
Number of additional shares approved for grant (in shares)         500,000  
Total compensation cost not yet recognized $ 2,500       $ 2,500  
Total compensation cost not yet recognized, period for recognition         1 year 10 months 24 days  
Long-Term Incentive Plan [Member]            
Share Based Compensation [Abstract]            
Total compensation expense recognized 400   $ 400   $ 1,200 $ 1,100
Tax benefit relating to compensation expense recognized $ 100   $ 100   $ 200 $ 200
Restricted Stock [Member] | Long-Term Incentive Plan [Member]            
Share Based Compensation [Abstract]            
Restricted stock and Performance stock units granted (in shares) 8,000 2,000 0 2,000 64,267 53,420
Vesting period 3 years 3 years   3 years    
Performance Stock Units [Member] | Long-Term Incentive Plan [Member]            
Share Based Compensation [Abstract]            
Restricted stock and Performance stock units granted (in shares) 0   0   22,016 19,986
Non-Employee Directors [Member]            
Share Based Compensation [Abstract]            
Number of additional shares approved for grant (in shares)         200,000  
Total compensation expense recognized $ 60   $ 50   $ 180 $ 160
Tax benefit relating to compensation expense recognized $ 10   $ 10   $ 40 $ 30
Executive Officers [Member] | Restricted Stock [Member] | Long-Term Incentive Plan [Member]            
Share Based Compensation [Abstract]            
Vesting period         3 years 3 years
Executive Officers [Member] | Performance Stock Units [Member] | Long-Term Incentive Plan [Member]            
Share Based Compensation [Abstract]            
Vesting period         3 years 3 years
Performance feature comparison period         3 years  
Directors [Member]            
Share Based Compensation [Abstract]            
Shares issues as retainer fees (in shares)         8,000 7,000