LEASES - Lease Costs & Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease cost	$ 1,132	$ 945	$ 2,265	$ 1,790
Variable lease cost	0	0	0	0
Sublease income	(938)	(1,073)	(2,133)	(1,941)
Lease cost	$ 194		$ 132
Lease income		$ (128)		$ (151)
Weighted-average remaining lease term - operating leases (in years)	10 years		10 years
Weighted-average discount rate - operating leases (as a percent)	3.19%		3.19%