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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number of Restricted Shares    
Nonvested balance, beginning 187,804 176,935
Granted (1) 85,435 78,775
Vested (25,897) (56,904)
Forfeited (1,180) (11,002)
Nonvested balance, ending 246,162 187,804
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 24.29 $ 22.51
Granted (1) 23.18 25.82
Vested 24.04 22.26
Forfeited 23.12 22.86
Nonvested balance, ending $ 23.94 $ 24.29