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LEASES - Lease Term and Cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Leases [Abstract]      
Weighted-average remaining lease term (in years) 9 years 7 days   9 years 3 months 3 days
Weighted-average discount rate 3.15%   3.15%
Operating lease cost $ 321 $ 234  
Variable lease cost 81 144  
Total lease cost $ 402 $ 378