CREDIT QUALITY ASSESSMENT - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 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			6,292	(14,491)	(13,894)
Loan charge-offs			(1,939)	(2,265)	(2,614)
Loan recoveries			645	801	1,131
Net (charge-offs)/ recoveries			(1,294)	(1,464)	(1,483)
Balance at period end	$ 125,863	$ 120,287	125,863	120,287	$ 120,865
Provision/ (credit) for credit losses	$ 1,020	$ 5,055	3,408	(16,481)
Unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision/ (credit) for credit losses			$ (2,900)	$ (2,000)