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Share-Based Compensation Plans - Additional information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 327,000 $ 350,000 $ 872,000 $ 701,000
Additional share based compensation expense     $ 232,000  
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Price $ 22.37   $ 22.37  
Incentive Plan 2015 [Member] | Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Extension of expiration period of stock options     2 years  
Incentive Plan 2016 [Member] | Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Extension of expiration period of stock options     1 year