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STOCK-BASED COMPENSATION - ACTIVITY OF STOCK OPTIONS (Details) - LTIP
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Stock Options  
Outstanding, beginning of year (in shares) | shares 72,368
Granted (in shares) | shares 0
Exercised (in shares) | shares (11,952)
Forfeited (in shares) | shares (399)
Outstanding, end of quarter (in shares) | shares 60,017
Number of options outstanding and exercisable (in shares) | shares 60,017
Weighted-Average Exercise Price  
Outstanding, beginning of year (in dollars per share) | $ / shares $ 34.36
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 34.36
Forfeited (in dollars per share) | $ / shares 34.36
Outstanding, end of quarter (in dollars per share) | $ / shares 34.36
Number of options outstanding and exercisable (in dollars per share) | $ / shares $ 34.36
Additional Information  
Weighted-Average Remaining Contractual Term (in years) 5 years 6 months
Weighted-Average Remaining Contractual Term, Number of options outstanding and exercisable (in years) 5 years 6 months
Aggregate Intrinsic Value (in thousands) | $ $ 763
Aggregate Intrinsic Value, Number of options outstanding and exercisable (in thousands) | $ $ 763