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LEASES - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
lease
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
lease
Jun. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average remaining lease term 9 years 7 months 6 days   9 years 7 months 6 days  
Operating lease, weighted average discount rate 3.32%   3.32%  
Operating lease, rent expense $ 200   $ 500  
Number of operating lease agreements | lease 1   1  
Finance lease, weighted average remaining lease term 11 years 7 months 6 days   11 years 7 months 6 days  
Finance lease, weighted average discount rate 3.37%   3.37%  
Financial lease not yet commenced | lease 0   0  
1365 New Scotland Road, Slingerlands, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, rent expense $ 12 $ 14 $ 25 $ 27
Operating lease, monthly rent expense     3  
2 Rush Street, Schenectady, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, rent expense $ 24 $ 26 50 $ 51
Operating lease, monthly rent expense     $ 7