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Share-Based Compensation Plans - Additional information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-Based Compensation Plans        
Allocated Share-based Compensation Expense $ 350,000 $ 365,000 $ 701,000 $ 731,000