GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss				$ 0
Amortization expense on other intangible assets				14,505,000	$ 7,949,000
First Mortgage
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights		$ 2,200,000		2,200,000		$ 500,000
SBA Loans
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights		4,100,000		4,100,000		2,800,000
Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 73,065,000
Intangible assets acquired	56,100,000
Bryn Mawr Bank Corporation Acquisition | First Mortgage
Finite-Lived Intangible Assets [Line Items]
Servicing assets acquired	2,000,000
Bryn Mawr Bank Corporation Acquisition | SBA Loans
Finite-Lived Intangible Assets [Line Items]
Servicing assets acquired	1,300,000
Core deposits | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets	10,900,000
Customer relationships | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	53,000,000
Tradename | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	2,900,000
Non-compete agreements | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	200,000
Loan servicing rights | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 3,300,000
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense on other intangible assets		$ 3,900,000	$ 2,600,000	11,800,000	7,900,000
Servicing Contracts | First Mortgage
Finite-Lived Intangible Assets [Line Items]
Increase (reversal) of impairment from change in valuation (prior year YTD less than)			$ (100,000)		$ (100,000)
Intangible Assets Excluding Loan Servicing Rights
Finite-Lived Intangible Assets [Line Items]
Impairment of other intangible assets				$ 0		$ 0