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LOANS HELD FOR SALE - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) entity	Sep. 30, 2023 USD ($) entity	Sep. 30, 2024 USD ($) entity	Sep. 30, 2023 USD ($) entity	Dec. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for sale (including nonperforming loans)	$ 5,300		$ 5,300		$ 500
Investment securities held to maturity	1,064,437		1,064,437		$ 1,103,170
Proceeds from sales of loans and leases			34,426	$ 409,503
Consumer Loan, Held-For-Sale | Personal And Other Installment Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value of consumer loans sold	$ 202,500		$ 202,500	$ 556,700
Number of counterparties | entity	2	2	2	2
Consumer Loan, Held-For-Sale | Other Installment Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, sale	$ 53,000		$ 53,000	$ 154,000
Variable Interest Entity, Not Primary Beneficiary
Financing Receivable, Credit Quality Indicator [Line Items]
Investment securities held to maturity	160,000	$ 436,800	160,000	436,800
Proceeds from sales of loans and leases	$ 40,200		$ 40,200	$ 115,100

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