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SHARE-BASED COMPENSATION PLANS - Stock options weighted-average assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
SHARE-BASED COMPENSATION PLANS    
Risk-free interest rate 0.54% 1.55%
Expected dividend yield 5.33% 4.11%
Expected term 8 years 8 years
Expected volatility 26.40% 24.00%