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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Income Tax Contingency [Line Items] |  |  |  |  |
Maximum corporate tax rate |  |  | 37.50% |  |
Valuation allowance | $ 166,400 |  | $ 166,400 |  |
Income tax expense | 34,103 | $ 40,092 | $ 77,128 | $ 68,114 |
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 |  |  | 31.70% | 33.20% |
Estimated annual effective tax rate, including all entities |  |  | 31.90% | 33.60% |
Effective Income Tax Rate Excluding Discrete Items |  |  | 32.30% | 33.80% |
Deferred tax asset that will be realized | 167,000 |  | $ 167,000 |  |
Accrued interest and penalties related to uncertain tax positions | 300 |  | 300 |  |
Santander [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
UTBs | 1,000 |  | 1,000 |  |
U S [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Current income tax expense | 2,500 | $ 1,400 | 4,100 | $ 2,500 |
FirstBank [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance | 127,700 |  | 127,700 |  | $ 69,700
Deferred tax asset that will be realized | $ 166,900 |  | $ 166,900 |  | $ 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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