GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (84,153)		$ (84,153)		$ (75,482)
Net Intangible Assets	107,383		107,383
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	194,436		194,436		194,144
Accumulated Amortization	(84,153)		(84,153)		(75,482)
Net Intangible Assets	110,283		110,283		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	(55,899)		(55,899)		(50,754)
Net Intangible Assets	$ 48,852		$ 48,852		$ 53,997
Amortization Period	10 years		10 years		10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (55,899)		$ (55,899)		$ (50,754)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	73,880		73,880		73,880
Accumulated Amortization	(20,871)		(20,871)		(18,153)
Net Intangible Assets	53,009		53,009		55,727
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (20,871)		$ (20,871)		$ (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	$ 12,905		$ 12,905		$ 12,613
Accumulated Amortization	(7,383)		(7,383)		(6,575)
Net Intangible Assets	5,522		5,522		6,038
Impairment loss	100	$ 200	200	$ 200	100
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (7,383)		$ (7,383)		$ (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