GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 115,762	$ 187,250
Accumulated Amortization	(75,482)	(58,655)
Net Intangible Assets		128,595
Indefinite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	194,144
Accumulated Amortization	(75,482)	(58,655)
Net Intangible Assets	$ 118,662	$ 128,595
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest expenses	Noninterest expenses
Trade Names
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived trademark	$ 2,900	$ 2,900
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	104,751	104,751
Accumulated Amortization	(50,754)	(40,443)
Net Intangible Assets	$ 53,997	$ 64,308
Amortization Period	10 years	10 years
Indefinite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (50,754)	$ (40,443)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	73,880	68,281
Accumulated Amortization	(18,153)	(12,937)
Net Intangible Assets	55,727	55,344
Indefinite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (18,153)	$ (12,937)
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	7 years	7 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years	15 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)
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 12,613	11,118
Accumulated Amortization	(6,575)	(5,075)
Net Intangible Assets	6,038	6,043
Impairment losses (current year less than)	100	300
Indefinite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (6,575)	$ (5,075)
Loan servicing rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years	10 years
Loan servicing rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	25 years	25 years