BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Liabilities assumed:
Goodwill resulting from acquisition of BMBC		$ 883,637		$ 472,828
Bryn Mawr Bank Corporation Acquisition
Business Acquisition [Line Items]
Common shares issued (18,116,848)	$ 908,016
Cash paid to BMBC stock and option holders	16
Value of consideration	908,032
Assets acquired:
Cash and due from banks	573,761
Investment securities	500,400
Loans and leases	3,456,748
Premises and equipment	44,842
Deferred income taxes	6,563
Bank owned life insurance	67,525
Intangible assets	73,065
Other assets	153,592
Total assets	4,876,496
Liabilities assumed:
Deposits	4,110,122
Other borrowings	145,512
Other liabilities	124,552
Noncontrolling interest	(913)
Total liabilities and noncontrolling interest	4,379,273
Net assets acquired:	497,223
Goodwill resulting from acquisition of BMBC	$ 410,809	$ 410,809	$ 414,337
Number of shares issued (in shares)	18,116,848