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STOCK-BASED COMPENSATION PLANS - Summary of equity award activity (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restricted stock units        
Stock-based compensation plans        
Outstanding (in shares) 108,865 129,422 128,159 139,986
Granted (in shares) 0 0 51,246 41,847
Exercised (in shares) 0 0 (70,540) (51,693)
Forfeited (in shares) (131) (520) (131) (1,238)
Outstanding (in shares) 108,734 128,902 108,734 128,902
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per share) $ 19.71 $ 19.58 $ 19.56 $ 18.01
Granted (in dollars per share) 0 0 19.06 22.72
Exercised (in dollars per share) 0 0 18.96 17.91
Forfeited (in dollars per share) 19.06 21.23 19.06 18.53
Outstanding (in dollars per share) $ 19.71 $ 19.57 $ 19.71 $ 19.57
Performance restricted stock units        
Stock-based compensation plans        
Outstanding (in shares) 70,333 79,097 79,097 62,067
Granted (in shares) 0 0 19,933 17,030
Adjustment for performance condition (in shares) 0 0 14,349 0
Vested (in shares) 0 0 (43,046) 0
Forfeited (in shares) 0 0 0 0
Outstanding (in shares) 70,333 79,097 70,333 79,097
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per share) $ 19.59 $ 18.25 $ 18.25 $ 17.02
Granted (in dollars per share) 0 0 19.06 22.72
Adjustment for performance condition (in dollars per share) 0 0 15.53 0
Vested (in dollars per share) 0 0 15.53 0
Forfeited (in dollars per share) 0 0 0 0
Outstanding (in dollars per share) $ 19.59 $ 18.25 $ 19.59 $ 18.25
Stock appreciation rights        
Stock-based compensation plans        
Outstanding (in shares) 73,440 73,440 73,440 73,440
Granted (in shares) 0 0 0 0
Exercised (in shares) 0 0 0 0
Expirations (in shares) 0 0 0 0
Forfeited (in shares) 0 0 0 0
Outstanding (in shares) 73,440 73,440 73,440 73,440
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per share) $ 16.32 $ 16.32 $ 16.32 $ 16.32
Granted (in dollars per share) 0 0 0 0
Exercised (in dollars per share) 0 0 0 0
Expired (in dollars per share) 0 0 0 0
Forfeited (in dollars per share) 0 0 0 0
Outstanding (in dollars per share) $ 16.32 $ 16.32 $ 16.32 $ 16.32
Weighted average remaining contractual term     4 years 7 months 6 days