GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets					$ 187,250
Accumulated Amortization	$ (66,884)		$ (66,884)		(58,655)
Net Intangible Assets	117,741		117,741		128,595
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	187,525		187,525
Accumulated Amortization	(66,884)		(66,884)		(58,655)
Net Intangible Assets	120,641		120,641		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	(45,602)		(45,602)		(40,443)
Net Intangible Assets	$ 59,149		$ 59,149		$ 64,308
Amortization Period	10 years		10 years		10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (45,602)		$ (45,602)		$ (40,443)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	68,281		68,281		68,281
Accumulated Amortization	(15,467)		(15,467)		(12,937)
Net Intangible Assets	52,814		52,814		55,344
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (15,467)		$ (15,467)		$ (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	$ 11,593		$ 11,593		$ 11,118
Accumulated Amortization	(5,815)		(5,815)		(5,075)
Net Intangible Assets	5,778		5,778		6,043
Impairment loss	200	$ 100	200	$ 100	300
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (5,815)		$ (5,815)		$ (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)