LEASES - Summary of Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Components of lease expense:
Operating lease cost (resulting from lease payments)	$ 2,577	$ 2,712	$ 5,142	$ 5,427
Supplemental cash flow information related to leases:
Operating cash flows from operating leases	2,796	2,861	5,620	5,749
ROU assets obtained in the exchange for lease liabilities due to new leases and acquisitions	407	0	1,402	703
Supplemental balance sheet information related to leases:
Operating lease ROU assets	39,180		39,180		$ 40,362
Operating lease liabilities	$ 46,399		$ 46,399		$ 48,058
Operating lease, right-of-use asset, statement of financial position	Other assets		Other assets		Other assets
Operating lease, liability, statement of financial position	Accrued interest payable and other liabilities		Accrued interest payable and other liabilities		Accrued interest payable and other liabilities
Other information related to leases:
Weighted average remaining lease term of operating leases	5 years 2 months 12 days		5 years 2 months 12 days		5 years 7 months 6 days
Weighted average discount rate of operating leases	3.73%		3.73%		3.61%
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	$ 0	$ 0