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Share-based Compensation - Award Status (Details) - Stock option awards
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Shares  
Outstanding at beginning of year (in shares) | shares 53,185
Exercised (in shares) | shares (12,956)
Expired (in shares) | shares (704)
Outstanding at end of year (in shares) | shares 39,525
Exercisable at end of year (in shares) | shares 39,525
Weighted-Average Exercise Price  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 22.00
Exercised (in dollars per share) | $ / shares 22.73
Expired (in dollars per share) | $ / shares 19.98
Outstanding at end of year (in dollars per share) | $ / shares 23.53
Exercisable at end of year (in dollars per share) | $ / shares $ 23.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 6 years 4 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 4 months 17 days