GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Impairment losses related to goodwill		$ 0
Amortization expense on other intangible assets		18,401,000	$ 10,583,000	$ 10,909,000
BMBC
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 73,065,000
Intangible assets acquired	56,100,000
First Mortgage
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights		2,100,000	500,000
First Mortgage | BMBC
Finite-Lived Intangible Assets [Line Items]
Servicing assets acquired	2,000,000
SBA Loans
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights		4,000,000	2,800,000
SBA Loans | BMBC
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		15,700,000	10,600,000	$ 10,900,000
Impairment of other intangible assets		0	0
Servicing Rights | First Mortgage
Finite-Lived Intangible Assets [Line Items]
(Loss) reversal from change in valuation		$ 300,000	$ 300,000
Loan servicing rights | BMBC
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	3,300,000
Core deposits | BMBC
Finite-Lived Intangible Assets [Line Items]
Intangible assets	10,900,000
Customer relationships | BMBC
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	53,000,000
Trade Names | BMBC
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	2,900,000
Non-compete agreements | BMBC
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 200,000