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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Income Tax Contingency [Line Items] |  |  |  |  |
Maximum corporate tax rate |  |  | 37.50% |  |
Net deferred tax asset | $ 142,700 |  | $ 142,700 |  | $ 150,100
Valuation allowance | 141,100 |  | 141,100 |  | 139,200
Income tax expense | 25,541 | $ 30,284 | $ 49,496 | $ 62,219 |
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items |  |  | 24.10% | 30.10% |
Current income tax expense | 2,900 | 1,500 | $ 5,100 | $ 4,000 |
Santander [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
UTBs | 800 |  | 800 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  | 200 |  |
Subsidiaries [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net deferred tax asset | 142,700 |  | 142,700 |  | 150,100
Valuation allowance | 113,200 |  | 113,200 |  | $ 111,400
Parent Company [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense | $ 0 | $ 0 | $ 1 | $ 1 |

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