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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Effective tax rate maximum statutory rate |  |  | 37.50% |  |
Minimum percentage of bank net taxable income for paying Income tax at normal rate |  |  | 20.00% |  |
Income Tax Expense (Benefit) | $ 37,057 | $ (4,405) | $ 105,171 | $ (1,326) |
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items |  |  | 33.00% | 21.00% |
Estimated annual effective tax rate, including all entities |  |  | 34.00% | 17.00% |
Effective Income Tax Rate Excluding Discrete Items |  |  | 34.00% | 23.00% |
Deferred Tax Assets Net | 243,400 |  | $ 243,400 |  |
Valuation allowance | 106,300 |  | 106,300 |  |
Accrued interest and penalties related to uncertain tax positions | 100 |  | 100 |  |
BSPR |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance |  | (8,000) |  | $ (8,000) |
Unrecognized Tax Benefits | 1,000 |  | 1,000 |  |
United States [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income Tax Expense (Benefit) | 2,100 | $ 1,200 | 4,500 | $ 3,400 |
FirstBank [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Deferred Tax Assets Net | 243,400 |  | 243,400 |  | $ 329,100
Valuation allowance | $ 65,600 |  | $ 65,600 |  | $ 59,900
Domestic Tax Authority [Member] | Other taxable domestic corporations [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Dividend received deduction |  |  | 85.00% |  |
Domestic Tax Authority [Member] | Subsidiaries [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Dividend received deduction |  |  | 100.00% |  |

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