GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (94,684)		$ (90,488)
Net Intangible Assets	95,084
Indefinite-lived Intangible Assets [Line Items]
Gross Intangible Assets	192,668		192,751
Accumulated Amortization	(94,684)		(90,488)
Net Intangible Assets	97,984		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	104,751		104,751
Accumulated Amortization	(63,538)		(60,999)
Net Intangible Assets	$ 41,213		$ 43,752
Amortization Period	10 years		10 years
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (63,538)		$ (60,999)
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	73,880		73,880
Accumulated Amortization	(24,946)		(23,588)
Net Intangible Assets	48,934		50,292
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (24,946)		$ (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	$ 11,137		$ 11,220
Accumulated Amortization	(6,200)		(5,901)
Net Intangible Assets	4,937		5,319
Impairment loss	100	$ 100	600
Indefinite-lived Intangible Assets [Line Items]
Accumulated Amortization	$ (6,200)		$ (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