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STOCK-BASED COMPENSATION PLANS - Summary of equity award activity (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Stock-based compensation plans        
Expirations (in shares) 0 0 0 0
Weighted Average Grant Date Assigned Value        
Expired (in dollars per share) $ 0 $ 0 $ 0 $ 0
Restricted stock units        
Stock-based compensation plans        
Outstanding (in shares) 129,422 120,631 139,986 109,244
Granted (in shares) 0 0 41,847 46,312
Exercised (in shares) 0 0 (51,693) (34,925)
Forfeited (in shares) (520) (1,328) (1,238) (1,328)
Outstanding (in shares) 128,902 119,303 128,902 119,303
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per share) $ 19.58 $ 17.98 $ 18.01 $ 17.27
Granted (in dollars per share) 0 0 22.72 19.11
Exercised (in dollars per share) 0 0 17.91 17.26
Forfeited (in dollars per share) 21.23 18.35 18.53 18.35
Outstanding (in dollars per share) $ 19.57 $ 17.98 $ 19.57 $ 17.98
Performance restricted stock units        
Stock-based compensation plans        
Outstanding (in shares) 79,097 62,067 62,067 38,344
Granted (in shares) 0 0 17,030 23,723
Vested (in shares) 0 0 0 0
Forfeited (in shares) 0 0 0 0
Outstanding (in shares) 79,097 62,067 79,097 62,067
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per share) $ 18.25 $ 17.02 $ 17.02 $ 15.72
Granted (in dollars per share) 0 0 22.72 19.14
Vested (in dollars per share) 0 0 0 0
Forfeited (in dollars per share) 0 0 0 0
Outstanding (in dollars per share) $ 18.25 $ 17.02 $ 18.25 $ 17.02
Stock appreciation rights        
Stock-based compensation plans        
Outstanding (in shares) 73,440 91,800 73,440 97,920
Granted (in shares) 0 0 0 0
Exercised (in shares) 0 0 0 (6,120)
Forfeited (in shares) 0 0 0 0
Outstanding (in shares) 73,440 91,800 73,440 91,800
Exercisable (in shares) 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 16.32
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     5 years 10 months 24 days