GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Impairment losses related to goodwill	$ 0
Amortization expense on other intangible assets	3,931,000	$ 3,845,000
First Mortgage
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights	1,700,000		$ 1,700,000
SBA Loans
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights	4,100,000		4,300,000
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense on other intangible assets	3,900,000	3,800,000
Impairment of other intangible assets	0		0
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Impairment loss	$ 100,000	$ (100,000)	$ 100,000