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Share Based Compensation - Stock Options Outstanding (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options Outstanding  
Number Outstanding (in shares) | shares 145,801
Weighted Average Remaining Contractual Life (in years) 2 years 91 days
Weighted Average Exercise Prices (in dollars per share) $ 17.97
Options Exercisable  
Number Outstanding (in shares) | shares 145,801
Weighted Average Exercise Price (in dollars per share) $ 17.97
Lower range of exercise prices (in dollars per share) 16.43
Upper range of exercise prices (in dollars per share) $ 21.87
$16.43  
Options Outstanding  
Number Outstanding (in shares) | shares 63,142
Weighted Average Remaining Contractual Life (in years) 1 year 47 days
Weighted Average Exercise Prices (in dollars per share) $ 16.43
Options Exercisable  
Number Outstanding (in shares) | shares 63,142
Weighted Average Exercise Price (in dollars per share) $ 16.43
$17.48  
Options Outstanding  
Number Outstanding (in shares) | shares 29,849
Weighted Average Remaining Contractual Life (in years) 3 years 51 days
Weighted Average Exercise Prices (in dollars per share) $ 17.48
Options Exercisable  
Number Outstanding (in shares) | shares 29,849
Weighted Average Exercise Price (in dollars per share) $ 17.48
$18.43  
Options Outstanding  
Number Outstanding (in shares) | shares 27,553
Weighted Average Remaining Contractual Life (in years) 2 years 47 days
Weighted Average Exercise Prices (in dollars per share) $ 18.43
Options Exercisable  
Number Outstanding (in shares) | shares 27,553
Weighted Average Exercise Price (in dollars per share) $ 18.43
$21.87  
Options Outstanding  
Number Outstanding (in shares) | shares 25,257
Weighted Average Remaining Contractual Life (in years) 4 years 51 days
Weighted Average Exercise Prices (in dollars per share) $ 21.87
Options Exercisable  
Number Outstanding (in shares) | shares 25,257
Weighted Average Exercise Price (in dollars per share) $ 21.87