BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Mar. 31, 2022	Dec. 31, 2021
Liabilities assumed:
Goodwill resulting from acquisition of BMBC		$ 887,165	$ 472,828
Bryn Mawr Bank Corporation Acquisition
Business Acquisition [Line Items]
Common shares issued (18,116,848)	$ 908,016
Number of shares issued (in shares)	18,116,848
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	8,433
Bank owned life insurance	67,525
Intangible assets	74,565
Other assets	145,491
Total assets	4,871,765
Liabilities assumed:
Deposits	4,110,271
Other borrowings	145,512
Other liabilities	123,200
Noncontrolling interest	(913)
Total liabilities and noncontrolling interest	4,378,070
Net assets acquired:	493,695
Goodwill resulting from acquisition of BMBC	$ 414,337