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Shareholders' Equity (Changes in Shares of Common Stock) (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Shareholders Equity [Line Items]          
Treasury stock, beginning balance   354,103     354,103
Shares issued, beginning balance 16,099,556 16,099,556 16,099,556 16,099,556 16,099,556
Treasury stock purchases         766,447
Treasury stock, ending balance 765,465       765,465
Shares issued, ending balance 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 15,299,077 15,745,453 15,828,899 16,041,926 15,745,453
Shares issued for Landmark Group acquisition       12,831  
Restricted stock units released 31,141 23,271   18,819  
Restricted stock awards issued 11,300   9,350    
Stock awards 3,848   3,680    
Treasury stock purchases (11,275) (469,647)   (244,677)  
Shares outstanding, ending balance 15,334,091 15,299,077 15,841,929 15,828,899 15,334,091
Treasury Stock [Member]          
Shareholders Equity [Line Items]          
Treasury stock, beginning balance 800,479 354,103 270,657 57,630 354,103
Shares issued for Landmark Group acquisition       (12,831)  
Restricted stock units released (31,141) (23,271)   (18,819)  
Restricted stock awards issued (11,300)   (9,350)    
Stock awards (3,848)   (3,680)    
Treasury stock purchases 11,275 469,647   244,677  
Treasury stock, ending balance 765,465 800,479 257,627 270,657 765,465