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Shareholders' Equity (Changes in Shares of Common Stock) (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shareholders Equity [Line Items]      
Shares outstanding, beginning balance 16,099,556 16,099,556  
Treasury stock, beginning balance 57,630    
Shares issued, beginning balance 16,099,556    
Shares outstanding, ending balance 16,099,556 16,099,556 16,099,556
Treasury stock, ending balance 354,103 57,630  
Shares issued, ending balance 16,099,556 16,099,556  
Common Stock [Member]      
Shareholders Equity [Line Items]      
Shares outstanding, beginning balance 16,041,926 16,002,899  
Shares issued for Landmark Group acquisition 12,831    
Restricted stock awards issued 9,350 12,798  
Restricted stock units released 24,069 24,921  
Stock awards 5,972 8,439  
Treasury stock purchases (348,695) (7,131)  
Shares outstanding, ending balance 15,745,453 16,041,926 16,002,899
Treasury Stock [Member]      
Shareholders Equity [Line Items]      
Treasury stock, beginning balance (57,630)    
Shares issued for Landmark Group acquisition (12,831)    
Restricted stock awards issued (9,350) (12,798) 96,657
Restricted stock units released (24,069) (24,921)  
Stock awards (5,972) (8,439)  
Treasury stock purchases 348,695 7,131  
Shares outstanding, ending balance 354,103    
Treasury stock, ending balance   (57,630)