ACQUISITIONS (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Nov. 12, 2021	Dec. 31, 2020
Assets
Goodwill	$ 985,072	$ 985,072		$ 506,206
Blue Hills Bancorp, Inc. [Member]
Assets
Cash			$ 798,470
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investments			266
Loans			4,908,949
Business Combination, Acquired Receivables, Estimated Uncollectible			(16,540)
Premises and equipment			66,825
Goodwill			478,866
Core deposit intangible			10,300
Other assets			125,543
Total assets acquired			6,372,679
Liabilities
Deposits			4,440,432
Borrowings			576,088
Other liabilities			46,432
Total liabilities assumed			5,062,952
Purchase price			$ 1,309,727