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Employee Benefit Plans - Summary of Restricted Stock Awards (Details) - Restricted Stock Awards - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Number of Shares    
Unvested, Beginning balance 299,798  
Vested (124,916)  
Unvested, Ending balance 174,882 299,798
Weighted Average Grant-Date Fair Value    
Unvested, Beginning balance $ 18.30  
Unvested, Ending balance $ 18.30 $ 18.30
Weighted Average Remaining Contractual Term (in years)    
Unvested, Weighted Average Remaining Contractual Term 1 year 1 month 6 days 2 years 3 months 18 days