LEASES - Lease Costs & Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 999	$ 833	$ 2,788	$ 2,500
Variable lease cost	0	0	0	0
Sublease income	(1,182)	(975)	(3,123)	(2,233)
Lease income	$ (183)	$ (142)	$ (335)
Lease cost				$ 267
Weighted-average remaining lease term - operating leases (in years)	10 years 4 months 24 days		10 years 4 months 24 days
Weighted-average discount rate - operating leases (as a percent)	3.22%		3.22%