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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowance | $ 183,200 |  |  | $ 183,200 |  |
Income tax expense (benefit) | 12,332 | $ (8,398) |  | 30,249 | $ (7,181) |
Deferred Tax Assets Net | $ 272,300 |  |  | $ 272,300 |  |
Minimum percentage of bank net taxable income for paying Income tax at normal rate | 20.00% |  |  | 20.00% |  |
Estimated annual effective tax rate excluding entities from which a tax benefit cannot be recognized and discrete items |  |  |  | 26.00% | 20.00% |
Effective Income Tax Rate Continuing Operations |  |  |  | 24.00% | (2.00%) |
Effective Income Tax Rate Excluding Discrete Items |  |  |  | 25.00% | 21.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | $ (13,200) |  |  |
FirstBank [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowance | $ 142,200 |  |  | $ 142,200 |  | $ 150,700
Deferred Tax Assets Net | $ 272,200 |  |  | 272,200 |  | $ 294,700
Domestic Tax Authority [Member] | Other taxable domestic corporations member [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Percentage of dividend received deduction | 85.00% |  |  |  |  |
Domestic Tax Authority [Member] | Subsidiaries [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Percentage of dividend received deduction | 100.00% |  |  |  |  |
United States [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations | $ 1,200 | $ 1,600 |  | $ 3,800 | $ 1,600 |

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