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Share-Based Compensation - Activity in stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Additional disclosures        
Compensation expense $ 761 $ 624 $ 1,300 $ 859
Restricted Stock Awards and Units        
Restricted Stock Awards and Units        
Outstanding at beginning of period     325,030 347,211
Granted     66,664 77,846
Vested     (88,382) (86,137)
Forfeited or cancelled       (5,068)
Outstanding at end of period 303,312 333,852 303,312 333,852
Weighted Average Grant Date Fair Value        
Outstanding at beginning of period     $ 19.48 $ 18.64
Granted     26.63 19.53
Vested     21.38 16.15
Forfeited or cancelled       19.37
Outstanding at end of period $ 20.49 $ 19.48 $ 20.49 $ 19.48
Additional disclosures        
Unrecognized compensation cost $ 3,600   $ 3,600  
Weighted average period     2 years 10 months 6 days