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Common Stock (Schedule of changes in number of common stock) (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]          
Shares outstanding, beginning 22,119,380 21,318,638 22,119,380 22,192,894  
Treasury shares repurchased through stock repurchase authorization (402,056) (225,205) (856,499) (116,034) (191,265)
Issuance of treasury shares for vesting of stock awards   102,060 31,442 18,205  
Issuance of shares related to employee stock ownership plan   24,315 24,315 24,315  
Shares outstanding, ending   21,219,808 21,318,638 22,119,380 22,192,894