GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Impairment losses related to goodwill			$ 0
Amortization expense on other intangible assets			11,596,000	$ 14,505,000
First Mortgage
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights	$ 1,800,000		1,800,000		$ 2,100,000
SBA Loans
Finite-Lived Intangible Assets [Line Items]
Value of servicing rights	4,200,000		4,200,000		4,000,000
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense on other intangible assets	3,900,000	$ 3,900,000	11,600,000	11,800,000
Impairment of other intangible assets			0		0
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Impairment loss	$ (200,000)	$ 100,000	$ (100,000)	$ 200,000	$ 300,000