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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average remaining lease term 11 years 7 months 28 days   11 years 7 months 28 days  
Operating lease, weighted average discount rate 3.37%   3.37%  
Operating leases, rent expense $ 300   $ 500  
Finance lease, weighted average remaining lease term 13 years 5 months 16 days   13 years 5 months 16 days  
Finance lease, weighted average discount rate 3.34%   3.34%  
Director        
Lessee, Lease, Description [Line Items]        
Operating leases, rent expense $ 21 $ 24 $ 45 $ 36
1365 New Scotland Road, Slingerlands, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating leases, rent expense $ 16 $ 12 28 $ 24
Operating lease, monthly rent expense     4  
2 Rush Street, Schenectady, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, monthly rent expense     $ 8