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LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Accrued interest | $ 88,900 |  | $ 88,200 |  |  |
Loans receivable, excluding accrued interest | $ 16,120,441 |  | 14,311,987 |  |  |
Loans held for sale, average life from purchase to sale | 30 days |  |  |  |  |
Allowance for credit loss, excluding accrued interest | $ 151,809 | $ 147,418 | 136,775 | $ 133,158 | $ 132,436 | $ 135,311
Allowance for credit loss, period increase | 15,000 |  |  |  |  |
Number of commitments to lend additional funds (commitment) | 0 |  |  |  |  |
Total consumer loans receivable | 14,668,170 |  | 13,104,883 |  |  |
Asset Pledged as Collateral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Total consumer loans receivable | 8,600,000 |  | 8,000,000 |  |  |
Consumer Installment Loans |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Total nonaccrual loans | 1,900 |  |  |  |  |
Commercial Real Estate | Other commercial and industrial | Collateral Dependent Loan |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Loans receivable, excluding accrued interest | $ 19,900 |  | $ 31,900 |  |  |

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