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Shareholders' Equity (Changes in Shares of Common Stock) (Details) - shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Shareholders Equity [Line Items]    
Treasury stock, beginning balance 354,103  
Shares issued, beginning balance 16,099,556 16,099,556
Treasury stock purchases 0  
Treasury stock, ending balance 800,479  
Shares issued, ending balance 16,099,556 16,099,556
Common Stock [Member]    
Shareholders Equity [Line Items]    
Shares outstanding, beginning balance 15,745,453 16,041,926
Shares issued for Landmark Group acquisition   12,831
Restricted stock units released 23,271 18,819
Treasury stock purchases (469,647) (244,677)
Shares outstanding, ending balance 15,299,077 15,828,899
Treasury Stock [Member]    
Shareholders Equity [Line Items]    
Treasury stock, beginning balance 354,103 57,630
Shares issued for Landmark Group acquisition   (12,831)
Restricted stock units released (23,271) (18,819)
Treasury stock purchases 469,647 244,677
Treasury stock, ending balance 800,479 270,657