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STOCK BASED COMPENSATION PLANS - Restricted Stock Units (Details) - LTI Plan - Restricted stock units
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Shares  
Unvested, January 1, 2019 | shares 79,238
Granted | shares 22,305
Reinvested dividends | shares 1,269
Forfeited | shares (16,184)
Vested | shares (2,573)
Unvested, June 30, 2019 | shares 84,055
Weighted Average Grant-Date Fair Value  
Unvested, January 1, 2019 | $ / shares $ 27.36
Granted | $ / shares 33.42
Reinvested dividends | $ / shares 28.46
Forfeited | $ / shares 23.34
Vested | $ / shares 32.90
Unvested, June 30, 2019 | $ / shares $ 29.59