GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 01, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss		$ 0
Amortization expense on other intangible assets		3,963,000	$ 2,651,000
Impairment of other intangible assets		0		$ 0
Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 74,565,000
Intangible assets acquired	60,400,000
First Mortgage
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights		2,400,000		500,000
First Mortgage | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Servicing assets acquired	2,000,000
SBA Loans
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights		4,100,000		$ 2,800,000
SBA Loans | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Servicing assets acquired	1,300,000
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense on other intangible assets		4,000,000	2,700,000
Servicing Contracts | First Mortgage
Finite-Lived Intangible Assets [Line Items]
Reversal of impairment from change in valuation (current year less than)		$ 100,000	$ 100,000
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	57,100,000
Tradename | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	2,800,000
Non-compete agreements | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	500,000
Loan servicing rights | Bryn Mawr Bank Corporation Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 3,300,000