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SHARE BASED COMPENSATION - Activity for Restricted Shares Awards and Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Share Awards      
Shares [Roll Forward]      
Unvested, beginning of period (in shares) 0 2,192 7,191
Granted (in shares)   0 0
Vested (in shares)   (2,192) (4,999)
Forfeited (in shares)   0 0
Unvested, end of period (in shares)   0 2,192
Wtd Avg Grant-Date Fair Value [Abstract]      
Unvested, beginning of period (in dollars per share)   $ 59.20
Granted (in dollars per share)  
Vested (in dollars per share)   $ 59.20 61.06
Unvested, end of period (in dollars per share)     $ 59.20
Restricted Stock Units with Service Conditions | Restricted Stock Units (RSU)      
Shares [Roll Forward]      
Unvested, beginning of period (in shares) 24,828 22,346 18,260
Granted (in shares) 13,693 17,981 16,084
Vested (in shares) (17,065) (14,991) (11,633)
Change in awards (in shares) 0 0  
Forfeited (in shares) (482) (508) (365)
Unvested, end of period (in shares) 20,974 24,828 22,346
Wtd Avg Grant-Date Fair Value [Abstract]      
Unvested, beginning of period (in dollars per share) $ 65.03 $ 58.41 $ 55.13
Granted (in dollars per share) 71.54 68.25 59.76
Vested (in dollars per share) 63.42 59.10 55.35
Change in awards (in dollars per share) 0 0  
Forfeited (in dollars per share) 70.44 62.99 51.73
Unvested, end of period (in dollars per share) $ 69.97 $ 65.03 $ 58.41
Restricted Stock With Market Conditions | Restricted Stock Units (RSU)      
Shares [Roll Forward]      
Unvested, beginning of period (in shares) 26,994 37,822 25,319
Granted (in shares) 19,224 0 12,978
Vested (in shares) (35,920) (13,357) 0
Change in awards (in shares) 8,926 4,436  
Forfeited (in shares) 0 (1,907) (475)
Unvested, end of period (in shares) 19,224 26,994 37,822
Wtd Avg Grant-Date Fair Value [Abstract]      
Unvested, beginning of period (in dollars per share) $ 67.87 $ 68.62 $ 62.84
Granted (in dollars per share) 87.04 0 79.49
Vested (in dollars per share) 65.34 74.68 0
Change in awards (in dollars per share) 0 0  
Forfeited (in dollars per share) 0 63.92 57.70
Unvested, end of period (in dollars per share) $ 87.04 $ 67.87 $ 68.62