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STOCK-BASED COMPENSATION PLANS - Summary of equity award activity (Details) - $ / shares
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Stock-based compensation plans    
Adjustment for performance condition (in shares) 14,349 0
Expirations (in shares) 0 0
Weighted Average Grant Date Assigned Value    
Expired (in dollars per share) $ 0 $ 0
Adjustment for performance condition (in dollars per share) $ 15.53 $ 0
Restricted stock units    
Stock-based compensation plans    
Outstanding (in shares) 128,159 139,986
Granted (in shares) 51,246 41,847
Exercised (in shares) (70,540) (51,693)
Forfeited (in shares) 0 (718)
Outstanding (in shares) 108,865 129,422
Weighted Average Grant Date Assigned Value    
Outstanding (in dollars per share) $ 19.56 $ 18.01
Granted (in dollars per share) 19.06 22.72
Exercised (in dollars per share) 18.96 17.91
Forfeited (in dollars per share) 0 16.58
Outstanding (in dollars per share) $ 19.71 $ 19.58
Performance restricted stock units    
Stock-based compensation plans    
Outstanding (in shares) 79,097 62,067
Granted (in shares) 19,933 17,030
Vested (in shares) (43,046) 0
Forfeited (in shares) 0 0
Outstanding (in shares) 70,333 79,097
Weighted Average Grant Date Assigned Value    
Outstanding (in dollars per share) $ 18.25 $ 17.02
Granted (in dollars per share) 19.06 22.72
Vested (in dollars per share) 15.53 0
Forfeited (in dollars per share) 0 0
Outstanding (in dollars per share) $ 19.59 $ 18.25
Stock appreciation rights    
Stock-based compensation plans    
Outstanding (in shares) 73,440 73,440
Granted (in shares) 0 0
Exercised (in shares) 0 0
Forfeited (in shares) 0 0
Outstanding (in shares) 73,440 73,440
Weighted Average Grant Date Assigned Value    
Outstanding (in dollars per share) $ 16.32 $ 16.32
Granted (in dollars per share) 0 0
Exercised (in dollars per share) 0 0
Forfeited (in dollars per share) 0 0
Outstanding (in dollars per share) $ 16.32 $ 16.32
Weighted average remaining contractual term 5 years 1 month 6 days