LEASES - Lease Costs & Additional Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 3,902	$ 3,334
Variable lease cost	0	0
Sublease income	(4,297)	(3,098)
Lease cost		$ 236
Lease Income	$ (395)
Weighted-average remaining lease term - operating leases (in years)	10 years 2 months 12 days
Weighted-average discount rate - operating leases (as a percent)	3.22%