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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Income Tax Contingency [Line Items] |  |  |  |  |
Maximum corporate tax rate |  |  | 37.50% |  |
Valuation allowance | $ 195,800 |  | $ 195,800 |  |
Income tax expense | 32,028 | $ 37,057 | $ 109,156 | $ 105,171 |
Minimum percentage of bank net taxable income for paying income tax at normal rate |  |  | 20.00% |  |
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items |  |  | 31.80% | 33.20% |
Estimated annual effective tax rate, including all entities |  |  | 32.00% | 33.60% |
Effective Income Tax Rate Excluding Discrete Items |  |  | 32.40% | 33.80% |
Deferred tax asset that will be realized | 166,100 |  | $ 166,100 |  |
Accrued interest and penalties related to uncertain tax positions | 200 |  | 200 |  |
Current income tax expense | 3,000 | $ 2,100 | 7,100 | $ 4,500 |
Santander [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
UTBs | 800 |  | 800 |  |
Benefit recognized from expiration of uncertain tax postions acquired | 400 |  |  |  |
FirstBank [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance | 158,700 |  | 158,700 |  | $ 69,700
Deferred tax asset that will be realized | $ 166,000 |  | $ 166,000 |  | $ 208,400
Domestic Country [Member] | Subsidiaries [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Dividend received deduction |  |  | 100.00% |  |
Domestic Country [Member] | Other taxable domestic corporations [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Dividend received deduction |  |  | 85.00% |  |

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