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Stock Compensation Plans (Restricted Stock Unit Award Transactions) (Details) - Restricted Stock Unit Awards
3 Months Ended
Mar. 31, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
Shares awarded but not earned, beginning of period (in shares) 143,287
Shares awarded (in shares) 89,775
Shares forfeited (in shares) (349)
Shares earned (in shares) (63,280)
Shares awarded but not earned, end of period (in shares) 169,433