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Employee Benefit Plans - Stock Transactions - Restricted Stock Awards (Details) - Restricted Stock - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted 2,000 7,500 17,000 37,650
Average grant date fair value (in dollars per share) $ 13.01 $ 20.00 $ 16.20 $ 20.52