GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets		$ 187,250
Accumulated Amortization	$ (62,676)	(58,655)
Net Intangible Assets	121,713	128,595
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	187,289
Accumulated Amortization	(62,676)	(58,655)
Net Intangible Assets	124,613	128,595
Tradename
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	(43,022)	(40,443)
Net Intangible Assets	$ 61,729	$ 64,308
Amortization Period	10 years	10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (43,022)	$ (40,443)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	68,281	68,281
Accumulated Amortization	(14,202)	(12,937)
Net Intangible Assets	54,079	55,344
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (14,202)	$ (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	$ 11,357	11,118
Accumulated Amortization	(5,452)	(5,075)
Net Intangible Assets	5,905	6,043
Impairment loss	(100)	300
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (5,452)	$ (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