LEASES - Summary of Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Components of lease expense:
Operating lease cost (resulting from lease payments)	$ 2,765	$ 3,151
Supplemental cash flow information related to leases:
Operating cash flows from operating leases	2,939	3,280
ROU assets obtained in the exchange for lease liabilities due to new leases and acquisitions	0	803
Supplemental balance sheet information related to leases:
Operating lease ROU assets	56,569		$ 57,872
Lease liability	$ 65,664		$ 67,138
Other information related to leases:
Weighted average remaining lease term of operating leases	8 years 9 months 18 days		9 years
Weighted average discount rate of operating leases	2.92%		2.92%
Revere Bank And RPJ
Supplemental cash flow information related to leases:
ROU assets obtained in the exchange for lease liabilities due to new leases and acquisitions	$ 0	$ 0