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EMPLOYEE STOCK COMPENSATION - Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Outstanding at beginning of year (in shares) 62,521 186,973 210,973
Exercised (in shares) (7,452) (74,836) (24,000)
Forfeited (in shares) 0 (49,616) 0
Outstanding at end of year (in shares) 55,069 62,521 186,973
Exercisable at end of year (in shares) 55,069 60,273 123,125
Weighted-Average Exercise Price per Share      
Outstanding at beginning of year (in dollars per share) $ 13.85 $ 13.54 $ 13.99
Exercised (in dollars per share) 13.05 13.41 17.50
Forfeited (in dollars per share) 0 13.34 0
Outstanding at end of year (in dollars per share) 13.96 13.85 13.54
Exercisable at end of year (in dollars per share) $ 13.96 $ 13.86 $ 13.67