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INVESTMENT SECURITIES - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) security entity | Sep. 30, 2023 USD ($) security contract | Sep. 30, 2024 USD ($) security | Sep. 30, 2023 USD ($) contract security entity | Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Proceeds from sales of investment securities available for sale | $ 100 | $ 4,100 | $ 240,847 | $ 4,075 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security | 21 |  | 21 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security | 92 |  | 92 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | security | 2 | 4 | 2 | 4 |
Number of corporate notes with deterioration in future estimated cash flows | security | 20 | 12 | 20 | 12 |
Number of available-for-sale investment securities, unrealized loss position | security | 113 |  | 113 |  | 119
Debt securities, available for sale | $ 2,377,733 |  | $ 2,377,733 |  | $ 2,376,860
Net gain on sale of loans | 0 | $ 200 | (200) | $ 200 |
Investment securities held to maturity | 1,064,437 |  | 1,064,437 |  | 1,103,170
Servicing assets | 2,100 | $ 3,800 | 2,100 | $ 3,800 |
Number of VIE Counterparties | contract |  | 1 |  | 1 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities held to maturity | 160,000 | $ 436,800 | 160,000 | $ 436,800 |
Consumer Loan, Held-For-Sale |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Net gain on sale of loans | 300 | $ 1,200 | 300 | 1,200 |
Consumer Loan, Held-For-Sale | Personal And Other Installment Loans |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Carrying value of consumer loans sold | $ 202,500 |  | 202,500 | $ 556,700 |
Number of VIEs | entity | 2 |  |  | 2 |
Consumer Loan, Held-For-Sale | Other Installment Loans |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Financing receivable, sale | $ 53,000 |  | 53,000 | $ 154,000 |
Asset-backed securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available for sale | 37,670 |  | 37,670 |  | 92,629
Investment securities held to maturity | 538,832 |  | 538,832 |  | 575,990
Asset Pledged as Collateral |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available for sale | 1,300,000 |  | 1,300,000 |  | 1,200,000
Debt securities | $ 412,300 |  | $ 412,300 |  | $ 398,400

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