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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Shares        
Nonvested, beginning of period (in shares)     145,677  
Nonvested, end of period (in shares) 130,629   130,629  
Restricted Stock        
Shares        
Nonvested, beginning of period (in shares)     145,677 140,577
Granted (in shares)     18,540 16,430
Vested (in shares)     (30,043) (15,920)
Forfeited (in shares)     (3,545) (2,930)
Nonvested, end of period (in shares) 130,629 138,157 130,629 138,157
Weighted-Average Grant Date Fair Value        
Nonvested, beginning of period (in dollars per share)     $ 48.88 $ 48.57
Granted (in dollars per share)     57.32 50.56
Vested (in dollars per share)     51.53 50.95
Forfeited (in dollars per share)     49.37 48.23
Nonvested, end of period (in dollars per share) $ 55.36 $ 48.54 $ 55.36 $ 48.54
Additional information        
Compensation expense $ 581,000 $ 524,000 $ 1,510,000 $ 1,530,000
Compensation expense after tax 412,000 $ 375,000 1,020,000.00 $ 1,090,000.00
Unrecognized compensation expense $ 2,900,000   $ 2,900,000  
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