GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	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]
Accumulated Amortization	$ (71,158)		$ (71,158)		$ (58,655)
Net Intangible Assets	119,674		119,674
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	193,732		193,732		187,250
Accumulated Amortization	(71,158)		(71,158)		(58,655)
Net Intangible Assets	122,574		122,574		128,595
Trade Names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived trademark	2,900		2,900		2,900
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	104,751		104,751		104,751
Accumulated Amortization	(48,180)		(48,180)		(40,443)
Net Intangible Assets	$ 56,571		$ 56,571		$ 64,308
Amortization Period	10 years		10 years		10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (48,180)		$ (48,180)		$ (40,443)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	73,880		73,880		68,281
Accumulated Amortization	(16,795)		(16,795)		(12,937)
Net Intangible Assets	57,085		57,085		55,344
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (16,795)		$ (16,795)		$ (12,937)
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	7 years		7 years		7 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years		15 years		15 years
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 12,201		$ 12,201		$ 11,118
Accumulated Amortization	(6,183)		(6,183)		(5,075)
Net Intangible Assets	6,018		6,018		6,043
Impairment loss	(200)	$ 100	(100)	$ 200	300
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (6,183)		$ (6,183)		$ (5,075)
Loan servicing rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years		10 years		10 years
Loan servicing rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	25 years		25 years		25 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets					$ 200
Accumulated Amortization					(200)
Net Intangible Assets					$ 0
Amortization Period					1 year
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization					$ (200)