LEASES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lessee, Lease, Description [Line Items]
Operating lease, weighted average remaining lease term	11 years 5 months 12 days		11 years 5 months 12 days
Operating lease, weighted average discount rate	3.39%		3.39%
Operating leases, rent expense	$ 200		$ 500
Finance lease, weighted average remaining lease term	13 years 2 months 19 days		13 years 2 months 19 days
Finance lease, weighted average discount rate	3.34%		3.34%
Director
Lessee, Lease, Description [Line Items]
Operating leases, rent expense	$ 24	$ 24	$ 69	$ 60
1365 New Scotland Road, Slingerlands, New York | Director
Lessee, Lease, Description [Line Items]
Operating leases, rent expense	$ 12	$ 12	40	$ 36
Operating lease, monthly rent expense			4
2 Rush Street, Schenectady, New York | Director
Lessee, Lease, Description [Line Items]
Operating lease, monthly rent expense			$ 8