LEASES - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Operating leases, option to extend	10 years
Operating lease right-of-use assets	$ 14,810		$ 13,291
Operating lease right-of-use liabilities	15,243		$ 13,539
Occupancy Expenses
Operating leases, rental expense	$ 1,715	$ 1,416
Minimum
Operating leases, remaining lease term	1 year
Maximum
Operating leases, remaining lease term	14 years