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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Shares        
Unvested, beginning of period (in shares)     135,694  
Unvested, end of period (in shares) 120,173   120,173  
Restricted Stock        
Shares        
Unvested, beginning of period (in shares)     135,694 145,677
Granted (in shares)     17,975 18,540
Vested (in shares)     (32,061) (30,043)
Forfeited (in shares)     (1,435) (3,545)
Unvested, end of period (in shares) 120,173 130,629 120,173 130,629
Weighted-Average Grant Date Fair Value        
Unvested, beginning of period (in dollars per share)     $ 52.13 $ 48.88
Granted (in dollars per share)     46.81 57.32
Vested (in dollars per share)     49.13 51.53
Forfeited (in dollars per share)     53.69 49.37
Unvested, end of period (in dollars per share) $ 52.12 $ 55.36 $ 52.12 $ 55.36
Additional information        
Fair value of shares vested $ 19,000 $ 232,000 $ 1,680,000 $ 1,730,000
Compensation expense 485,000 581,000 1,460,000 1,510,000
Compensation expense after tax 347,000 $ 412,000 1,010,000.00 $ 1,020,000.00
Unrecognized compensation expense $ 2,980,000   $ 2,980,000  
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