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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Shares        
Unvested, beginning of period (in shares)     135,694  
Unvested, end of period (in shares) 120,388   120,388  
Restricted Stock        
Shares        
Unvested, beginning of period (in shares)     135,694 145,677
Granted (in shares)     17,775 18,255
Vested (in shares)     (31,681) (25,763)
Forfeited (in shares)     (1,400) (3,440)
Unvested, end of period (in shares) 120,388 134,729 120,388 134,729
Weighted-Average Grant Date Fair Value        
Unvested, beginning of period (in dollars per share)     $ 52.13 $ 48.88
Granted (in dollars per share)     46.75 57.39
Vested (in dollars per share)     49.08 51.88
Forfeited (in dollars per share)     53.60 49.13
Unvested, end of period (in dollars per share) $ 52.12 $ 49.45 $ 52.12 $ 49.45
Additional information        
Compensation expense $ 463,000 $ 453,000 $ 973,000 $ 927,000
Compensation expense after tax 354,000 $ 316,000 667,000 $ 612,000
Unrecognized compensation expense $ 3,460,000   $ 3,460,000  
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