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SHARE-BASED COMPENSATION - Share-based Compensation Activity (Details) - Citizens Share Awards - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares Underlying Awards      
Nonvested, Beginning of period (in shares) 3,496,231 3,000,224 2,893,281
Assumed (in shares) 82,013 0 0
Granted (in shares) 1,417,370 1,947,902 1,677,167
Vested and Distributed (in shares) (1,400,722) (1,384,091) (1,518,836)
Forfeited (in shares) (91,936) (67,804) (51,388)
Nonvested, End of period (in shares) 3,502,956 3,496,231 3,000,224
Weighted Average Grant Price      
Nonvested, Beginning of period (in dollars per share) $ 34.37 $ 36.71 $ 34.04
Assumed (in dollars per share) 49.95 0 0
Granted (in dollars per share) 44.97 32.64 36.21
Vested and Distributed (in dollars per share) 38.88 38.59 32.21
Forfeited (in dollars per share) 35.00 35.89 38.29
Nonvested, End of period (in dollars per share) $ 38.23 $ 34.37 $ 36.71