LEASES - Lease Cost and Other Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) lease	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Leases
Right-of-use assets	$ 13,768		$ 13,768		$ 13,842
Lease liability	14,568		$ 14,568
Number of additional operating or financing leases not yet commenced | lease			0
Lease Cost
Capitalized operating lease cost	1,111	$ 1,152	$ 3,450	$ 3,533
Short-term lease cost	109	43	194	129
Total lease cost	1,220	1,195	3,644	3,662
Cash paid for amounts included in the measurement of lease liabilities and capitalized operating leases:
Operating cash flows	$ 1,145	$ 1,211	$ 3,510	$ 3,722
Weighted-average remaining lease term - Capitalized operating leases (in years)	5 years 1 month 17 days	5 years 11 months 1 day	5 years 1 month 17 days	5 years 11 months 1 day
Weighted-average discount rate - Capitalized operating leases	3.92%	3.92%	3.92%	3.92%
Related Parties
Leases
Right-of-use assets	$ 3,739		$ 3,739
Lease liability	3,739		3,739
Lease Cost
Capitalized operating lease cost	313	$ 379	1,071	$ 1,137
Short-term lease cost	107	41	188	123
Total lease cost	420	420	1,259	1,260
Cash paid for amounts included in the measurement of lease liabilities and capitalized operating leases:
Operating cash flows	$ 313	$ 379	$ 1,071	$ 1,137
Weighted-average remaining lease term - Capitalized operating leases (in years)	3 years 2 months 1 day	4 years 1 month 9 days	3 years 2 months 1 day	4 years 1 month 9 days
Weighted-average discount rate - Capitalized operating leases	3.92%	3.92%	3.92%	3.92%
Others
Lease Cost
Capitalized operating lease cost	$ 798	$ 773	$ 2,379	$ 2,396
Short-term lease cost	2	2	6	6
Total lease cost	800	775	2,385	2,402
Cash paid for amounts included in the measurement of lease liabilities and capitalized operating leases:
Operating cash flows	$ 832	$ 832	$ 2,439	$ 2,585
Weighted-average remaining lease term - Capitalized operating leases (in years)	5 years 9 months 21 days	6 years 9 months 10 days	5 years 9 months 21 days	6 years 9 months 10 days
Weighted-average discount rate - Capitalized operating leases	3.92%	3.92%	3.92%	3.92%