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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of Restricted Shares    
Nonvested balance, beginning 187,804 176,935
Granted (1) 92,960 78,775
Vested (58,061) (56,904)
Forfeited (6,633) (11,002)
Nonvested balance, ending 216,070 187,804
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 24.29 $ 22.51
Granted (1) 23.55 25.82
Vested 22.29 22.26
Forfeited 22.94 22.86
Nonvested balance, ending $ 24.55 $ 24.29