GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (88,466)		$ (88,466)		$ (75,482)
Net Intangible Assets	103,365		103,365
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	194,731		194,731		194,144
Accumulated Amortization	(88,466)		(88,466)		(75,482)
Net Intangible Assets	106,265		106,265		118,662
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	(58,463)		(58,463)		(50,754)
Net Intangible Assets	$ 46,288		$ 46,288		$ 53,997
Amortization Period	10 years		10 years		10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (58,463)		$ (58,463)		$ (50,754)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	73,880		73,880		73,880
Accumulated Amortization	(22,229)		(22,229)		(18,153)
Net Intangible Assets	51,651		51,651		55,727
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (22,229)		$ (22,229)		$ (18,153)
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	$ 13,200		$ 13,200		$ 12,613
Accumulated Amortization	(7,774)		(7,774)		(6,575)
Net Intangible Assets	5,426		5,426		6,038
Impairment loss	100	$ 200	200	$ 100	100
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (7,774)		$ (7,774)		$ (6,575)
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