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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Shares    
Unvested, beginning of period (in shares) 135,694  
Unvested, end of period (in shares) 121,238  
Restricted Stock    
Shares    
Unvested, beginning of period (in shares) 135,694 145,677
Granted (in shares) 11,775 10,655
Vested (in shares) (26,096) (19,408)
Forfeited (in shares) (135) (1,170)
Unvested, end of period (in shares) 121,238 135,754
Weighted-Average Grant Date Fair Value    
Unvested, beginning of period (in dollars per share) $ 52.13 $ 48.88
Granted (in dollars per share) 52.93 59.00
Vested (in dollars per share) 47.74 52.34
Forfeited (in dollars per share) 58.42 50.54
Unvested, end of period (in dollars per share) $ 53.15 $ 49.16
Additional information    
Compensation expense $ 510,000 $ 474,000
Compensation expense after tax 313,000 $ 296,000
Unrecognized compensation expense $ 3,780,000  
Restricted Stock | Employees    
Summary of restricted stock awards    
Vesting period 5 years  
Restricted Stock | Nonemployee Directors    
Summary of restricted stock awards    
Vesting period 3 years