LEASE OBLIGATIONS - Right-of-use assets and lease liabilities relating to operating and finance leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Right-of-use assets:
Operating lease right-of-use assets	$ 5,969	$ 6,518
Finance lease right-of-use assets	2,658
Total right-of-use assets	8,627	6,518
Lease liabilities:
Operating lease liabilities	6,031	6,518
Finance lease liabilities	2,281	0
Total lease liabilities	$ 8,312	$ 6,518
Weighted average remaining lease term
Operating leases	4 years 4 months 24 days	5 years
Finance leases	11 years 2 months 12 days	0 years
Weighted average discount rate
Operating leases	2.30%	2.50%
Finance leases	2.00%