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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Outstanding, beginning of year (in shares) 75,897 115,714
Outstanding, beginning of year (in dollars per share) $ 18.69 $ 18.49
Granted (in shares) 0 0
Exercised (in shares) (17,222) (31,304)
Exercised (in dollars per share) $ 18.25 $ 17.65
Forfeited (in shares) (1,564) 0
Forfeited (in dollars per share) $ 15.06  
Expired (in shares) 0 (8,513)
Expired (in dollars per share)   $ 19.88
Outstanding, end of year (in shares) 57,111 75,897
Outstanding, end of year (in dollars per share) $ 18.92 $ 18.69
Options exercisable at year-end (in shares) 57,111 75,897
Options exercisable at year-end (in dollars per share) $ 18.92 $ 18.69
Weighted-average fair value of options forfeited (in dollars per share) $ 4.26