GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (95,522)	$ (90,488)
Net Intangible Assets	85,552
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	183,974	192,751
Accumulated Amortization	(95,522)	(90,488)
Net Intangible Assets	88,452	102,263
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	101,511	104,751
Accumulated Amortization	(65,373)	(60,999)
Net Intangible Assets	$ 36,138	$ 43,752
Amortization Period	10 years	10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (65,373)	$ (60,999)
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	68,270	73,880
Accumulated Amortization	(23,378)	(23,588)
Net Intangible Assets	44,892	50,292
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (23,378)	$ (23,588)
Client relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	7 years	7 years
Client relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years	15 years
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 11,293	$ 11,220
Accumulated Amortization	(6,771)	(5,901)
Net Intangible Assets	4,522	5,319
Valuation allowance, impairment loss	(400)	(100)
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (6,771)	$ (5,901)
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