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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Weighted Average Fair Value    
Unrecognized compensation expense related to non-vested restricted stock awards $ 9,915  
Weighted average period expected for recognition of compensation expense related to non-vested restricted stock awards 1 year 9 months 18 days  
Total fair value of the shares that were vested and unrestricted during the period $ 5,734 $ 6,878
Compensation expense, net of tax 1,646 1,469
Income tax benefits from compensation expense $ 437 $ 391
Performance-based Shares Under Restriction    
Shares Under Restriction    
Outstanding at beginning of year (in shares) 72,418  
Granted (in shares) 31,828  
Vested and unrestricted (in shares) (26,504)  
Forfeited (in shares) (477)  
Outstanding at end of period (in shares) 77,265  
Weighted Average Fair Value    
Outstanding at beginning of year (in dollars per share) $ 84.94  
Granted (in dollars per share) 86.35  
Vested and unrestricted (in dollars per share) 92.52  
Forfeited (in dollars per share) 84.40  
Outstanding at end of period (in dollars per share) $ 84.42  
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) 65,171  
Granted (in shares) 38,864  
Vested and unrestricted (in shares) (38,155)  
Forfeited (in shares) (330)  
Outstanding at end of period (in shares) 65,550  
Weighted Average Fair Value    
Outstanding at beginning of year (in dollars per share) $ 85.16  
Granted (in dollars per share) 85.22  
Vested and unrestricted (in dollars per share) 86.01  
Forfeited (in dollars per share) 83.01  
Outstanding at end of period (in dollars per share) $ 83.85  
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%