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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Shares      
Unvested, beginning of period (in shares) 135,694    
Unvested, end of period (in shares) 119,778 135,694  
Restricted Stock      
Shares      
Unvested, beginning of period (in shares) 135,694 145,677 140,577
Granted (in shares) 32,320 36,945 36,435
Vested (in shares) (46,801) (43,383) (26,200)
Forfeited (in shares) (1,435) (3,545) (5,135)
Unvested, end of period (in shares) 119,778 135,694 145,677
Weighted-Average Grant Date Fair Value      
Unvested, beginning of period (in dollars per share) $ 52.13 $ 48.88 $ 48.57
Granted (in dollars per share) 60.15 62.87 54.18
Vested (in dollars per share) 51.39 50.59 54.73
Forfeited (in dollars per share) 53.69 49.37 48.28
Unvested, end of period (in dollars per share) $ 54.56 $ 52.13 $ 48.88
Additional information      
Fair value of shares vested $ 2,730 $ 2,520 $ 1,390
Compensation expense 1,920 1,990 1,970
Compensation expense after tax 1,290 $ 1,350 $ 1,420
Unrecognized compensation expense $ 3,650    
Weighted average period 3 years    
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