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Shareholders' Equity (Changes in Shares of Common Stock) (Details) - shares
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Dec. 31, 2020
Shareholders Equity [Line Items]            
Treasury stock, beginning balance   57,630     57,630  
Shares issued, beginning balance 16,099,556 16,099,556 16,099,556 16,099,556 16,099,556 16,099,556
Treasury stock purchases 0       238,439 0
Treasury stock, ending balance 257,627       257,627 57,630
Shares issued, ending balance 16,099,556 16,099,556 16,099,556 16,099,556 16,099,556 16,099,556
Common Stock [Member]            
Shareholders Equity [Line Items]            
Shares outstanding, beginning balance 15,828,899 16,041,926 16,019,384 16,002,899 16,041,926 16,002,899
Shares issued for Landmark Group acquisition   12,831        
Restricted stock units released   18,819   22,921    
Restricted stock awards issued 9,350   12,798      
Stock awards 3,680   5,403      
Treasury stock purchases   (244,677)   (6,436)    
Shares outstanding, ending balance 15,841,929 15,828,899 16,037,585 16,019,384 15,841,929 16,041,926
Treasury Stock [Member]            
Shareholders Equity [Line Items]            
Treasury stock, beginning balance 270,657 57,630 80,172 96,657 57,630 96,657
Shares issued for Landmark Group acquisition   (12,831)        
Restricted stock units released   (18,819)   (22,921)    
Restricted stock awards issued (9,350)   (12,798)      
Stock awards (3,680)   (5,403)      
Treasury stock purchases   244,677   6,436    
Treasury stock, ending balance 257,627 270,657 61,971 80,172 257,627 57,630