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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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