LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 271	$ 271	$ 258	$ 258
Operating lease payments	1,023	1,023	1,004	1,004
Operating lease right-of-use assets	858	1,580	858	1,580
Operating lease liabilities	$ 858	$ 1,580	$ 858	$ 1,580
Weighted average remaining lease term	8 months 12 days	1 year 7 months 6 days	8 months 12 days	1 year 7 months 6 days
Weighted average discount rate	3.00%	3.10%	3.00%	3.10%
2021	$ 717		$ 717
2022	137		137
2023	4		$ 4
Lessor, Operating Lease, Existence of Option to Extend [true false]			true
Property, plant and equipment, gross	583,332	$ 567,215	$ 583,332	$ 567,215
Lease income	$ 863	$ 3,191	$ 718	$ 2,951
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	3 years	3 years	3 years	3 years
Commercial real estate leased to third parties
Lessee, Lease, Description [Line Items]
Property, plant and equipment, gross	$ 51,426	$ 36,378	$ 51,426	$ 36,378
Depreciation			$ 14,784	$ 10,252
Commercial real estate leased to third parties | Maximum
Lessee, Lease, Description [Line Items]
Lessor, renewal term	60 years		60 years