CREDIT QUALITY ASSESSMENT - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 120,865	$ 136,242	$ 136,242
Provision/ (credit) for credit losses - loans			12,602	(11,320)	(13,894)
Loan charge-offs			(2,810)	(2,518)	(2,614)
Loan recoveries			771	956	1,131
Net (charge-offs)/ recoveries			(2,039)	(1,562)	(1,483)
Balance at period end	$ 131,428	$ 123,360	131,428	123,360	$ 120,865
Provision/ (credit) for credit losses	$ 6,316	$ 2,365	9,724	(14,116)
Unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision/ (credit) for credit losses			$ (2,900)	$ (2,800)