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Share-Based Compensation Plans - Additional information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-Based Compensation Plans        
Allocated Share-based Compensation Expense $ 362,000 $ 371,000 $ 1,063,000 $ 1,102,000