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INVESTMENT SECURITIES - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) security issuer | Sep. 30, 2024 USD ($) entity | Sep. 30, 2025 USD ($) security issuer | Sep. 30, 2024 USD ($) entity | Dec. 31, 2024 USD ($) position security
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Proceeds from sales of investment securities available for sale | $ 100,900,000 | $ 100,000 | $ 551,337,000 | $ 240,847,000 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security | 17 |  | 17 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security | 38 |  | 38 |  |
Number of available-for-sale investment securities, unrealized loss position | security | 55 |  | 55 |  | 117
Number of issuers | issuer | 4 |  | 4 |  |
Accrued interest reversal | $ 700,000 |  | $ 4,800,000 | 0 |
Debt securities, available for sale | 1,979,832,000 |  | 1,979,832,000 |  | $ 1,985,438,000
Investment securities held to maturity | 801,324,000 |  | 801,324,000 |  | 991,937,000
Servicing asset |  | 2,100,000 |  | 2,100,000 |
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest | 0 |  | 0 |  | 0
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities held to maturity |  | 160,000,000 |  | 160,000,000 |
Asset Pledged as Collateral |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available for sale | 1,400,000,000 |  | 1,400,000,000 |  | 1,300,000,000
Debt securities | 408,200,000 |  | 408,200,000 |  | $ 386,400,000
Corporate notes |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of securities on nonaccrual status | position |  |  |  |  | 1
Accrued interest reversal |  | 0 |  |  |
Debt securities, available for sale | 299,432,000 |  | 299,432,000 |  | $ 516,330,000
Consumer Loan, Held-For-Sale |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Loss on sale of financing receivable |  | 300,000 |  | 300,000 |
Consumer Loan, Held-For-Sale | Personal And Other Installment Loans |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Receivables sold |  | $ 202,500,000 |  | $ 202,500,000 |
Number of VIEs | entity |  | 2 |  | 2 |
Consumer Loan, Held-For-Sale | Other Installment Loans |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Financing receivable, sale |  | $ 53,000,000 |  | $ 53,000,000 |
Asset-backed securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available for sale | 281,839,000 |  | 281,839,000 |  | 13,236,000
Investment securities held to maturity | 301,284,000 |  | 301,284,000 |  | 471,996,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest | $ 0 |  | $ 0 |  | $ 0

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