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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Minimum percentage of bank net taxable income for paying Income tax at normal rate |  |  | 20.00% |  |
Income tax expense | $ 18,011 | $ 10,159 | $ 35,629 | $ 17,917 |
Estimated annual effective tax rate excluding entities from which a tax benefit cannot be recognized and discrete items |  |  | 29.00% | 25.00% |
Effective Income Tax Rate Continuing Operations |  |  | 29.00% | 24.00% |
Effective Income Tax Rate Excluding Discrete Items |  |  | 30.00% | 25.00% |
Deferred Tax Assets Net | 290,300 |  | $ 290,300 |  |
Valuation allowance | 92,800 |  | 92,800 |  |
United States [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense | 1,200 | $ 1,000 | 2,200 | $ 2,600 |
FirstBank [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Deferred Tax Assets Net | 290,200 |  | 290,200 |  | $ 319,800
Valuation allowance | $ 60,000 |  | $ 60,000 |  | $ 68,100
Domestic Tax Authority [Member] | Other taxable domestic corporations member [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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