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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Lessee, Lease, Description [Line Items]          
Operating lease, weighted average remaining lease term (in years)         8 years 9 months 18 days
Operating lease, weighted average discount rate         3.27%
Operating lease, rent expense $ 200   $ 500    
Finance lease, weighted average remaining lease term (in years) 12 years 6 months   12 years 6 months    
Finance lease, weighted average discount rate 3.35%   3.35%    
Director          
Lessee, Lease, Description [Line Items]          
Operating lease, rent expense $ 26 $ 21 $ 51 $ 45  
1365 New Scotland Road, Slingerlands, New York | Director          
Lessee, Lease, Description [Line Items]          
Operating lease, rent expense $ 14 $ 16 27 $ 28  
Operating lease, monthly rent expense     3    
2 Rush Street, Schenectady, New York | Director          
Lessee, Lease, Description [Line Items]          
Operating lease, monthly rent expense     $ 7