GOODWILL AND INTANGIBLE ASSETS - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets			$ 115,763
Accumulated Amortization	$ (54,348)	$ (54,348)	(41,360)
Net Intangible Assets	129,876	129,876	74,403
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Intangible Assets	187,124	187,124
Accumulated Amortization	(54,348)	(54,348)	(41,360)
Net Intangible Assets	132,776	132,776	74,403
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	93,811
Accumulated Amortization	(37,863)	(37,863)	(30,103)
Net Intangible Assets	66,888	$ 66,888	$ 63,708
Amortization Period		10 years	10 years
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(37,863)	$ (37,863)	$ (30,103)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	68,281	68,281	15,281
Accumulated Amortization	(11,671)	(11,671)	(7,876)
Net Intangible Assets	56,610	56,610	7,405
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(11,671)	$ (11,671)	$ (7,876)
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	$ 200
Accumulated Amortization	(150)	(150)
Net Intangible Assets	50	$ 50
Amortization Period		1 year
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(150)	$ (150)
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	10,992	10,992	$ 6,671
Accumulated Amortization	(4,664)	(4,664)	(3,381)
Net Intangible Assets	6,328	6,328	3,290
Impairment loss	100	200
Impairment loss reversal			300
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	$ (4,664)	$ (4,664)	$ (3,381)
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