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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average remaining lease term (in years) 10 years 6 months   10 years 6 months  
Operating lease, weighted average discount rate 3.39%   3.39%  
Operating lease, rent expense $ 200   $ 700  
Finance lease, weighted average remaining lease term (in years) 12 years 3 months 18 days   12 years 3 months 18 days  
Finance lease, weighted average discount rate 3.35%   3.35%  
1365 New Scotland Road, Slingerlands, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, rent expense $ 13 $ 12 $ 40  
Operating lease, monthly rent expense     3  
2 Rush Street, Schenectady, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, rent expense $ 26 $ 24 76 $ 69
Operating lease, monthly rent expense     $ 7