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Share-Based Compensation Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Weighted Average Fair Value      
Unrecognized compensation expense related to non-vested restricted stock awards $ 6,164    
Weighted average period expected for recognition of compensation expense related to non-vested restricted stock awards 1 year 6 months    
Total fair value of the shares that were vested and unrestricted during the period $ 6,947 $ 6,516 $ 7,784
Compensation Expense, Net of Tax 4,971 5,893 4,764
Income tax benefits from compensation expense $ 1,321 $ 1,566 $ 1,266
Performance-based Shares Under Restriction      
Share-Based Compensation      
Vesting period 3 years    
Shares Under Restriction      
Outstanding at beginning of year (in shares) 71,964 84,105 105,170
Granted (in shares) 49,460 36,649 63,447
Vested and unrestricted (in shares) (48,666) (42,123) (84,512)
Forfeited (in shares) (340) (6,667)  
Outstanding at end of period (in shares) 72,418 71,964 84,105
Weighted Average Fair Value      
Outstanding at beginning of year (in dollars per share) $ 84.94 $ 79.34 $ 66.79
Granted (in dollars per share) 77.56 84.68 69.61
Vested and unrestricted (in dollars per share) 75.05 73.55 56.42
Forfeited (in dollars per share) 87.43 84.86  
Outstanding at end of period (in dollars per share) $ 86.53 $ 84.94 $ 79.34
Performance-based Shares Under Restriction | Minimum      
Share-Based Compensation      
Actual Payouts (as a percent) 0.00%    
Performance-based Shares Under Restriction | Maximum      
Share-Based Compensation      
Actual Payouts (as a percent) 200.00%    
Restricted Stock      
Share-Based Compensation      
Vesting period 3 years    
Shares Under Restriction      
Outstanding at beginning of year (in shares) 66,550 78,202 89,135
Granted (in shares) 39,840 34,799 33,778
Vested and unrestricted (in shares) (40,763) (43,757) (44,085)
Forfeited (in shares) (456) (2,694) (626)
Outstanding at end of period (in shares) 65,171 66,550 78,202
Weighted Average Fair Value      
Outstanding at beginning of year (in dollars per share) $ 85.16 $ 79.09 $ 68.70
Granted (in dollars per share) 79.27 90.10 92.52
Vested and unrestricted (in dollars per share) 80.82 78.10 68.41
Forfeited (in dollars per share) 81.17 87.70 75.50
Outstanding at end of period (in dollars per share) $ 84.30 $ 85.16 $ 79.09
Restricted Stock | Executives and non-executives (2018 and after)      
Share-Based Compensation      
Vesting period 5 years    
Restricted Stock | First anniversary of grant date      
Share-Based Compensation      
Vesting percentage (as a percent) 30.00%    
Restricted Stock | Second anniversary of grant date      
Share-Based Compensation      
Vesting percentage (as a percent) 30.00%    
Restricted Stock | Third anniversary of grant date      
Share-Based Compensation      
Vesting percentage (as a percent) 40.00%