CREDIT QUALITY ASSESSMENT - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 109,145	$ 165,367	$ 165,367
Provision/ (credit) for credit losses - loans			18,773	(47,141)	(45,556)
Loan charge-offs			(1,029)	(11,496)	(12,313)
Loan recoveries			1,379	1,190	1,647
Net recoveries (charge-offs)			350	(10,306)	(10,666)
Balance at period end	$ 128,268	$ 107,920	128,268	107,920	$ 109,145
Provision/ (credit) for credit losses	$ 18,890	$ (8,229)	23,571	$ (47,141)
Unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision/ (credit) for credit losses			$ 4,800