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INCOME TAXES - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) subsidiaries | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Tax Contingency [Line Items] |  |  |
Number of subsidiaries from which corporation is not able to utilize losses | subsidiaries | 1 |  |
Percentage of dividend received deduction from controlled subsidiaries | 100.00% |  |
Percentage of dividend received from other taxable domestic corporations | 85.00% |  |
Statutory rate | 39.00% | 39.00% | 39.00%
Minimum percentage of bank net taxable income for paying Income tax at normal rate | 20.00% |  |
Income tax expense | $ (4,973) | $ 37,030 | $ 6,419
Net Deferred Tax Assets Tax Credit Carryforwards And Temporary Differences | $ 125,600 | 117,000 |
Cumulative Gain Position Period | 3 years |  |
Defferred Tax Assets Other Net Operating Losses | $ 5,600 | 12,900 |
Valuation allowance | 191,183 | 207,216 |
Income Tax Benefit Change In Tax Status | $ 13,200 |  |
Section 382 Change In Ownership Testing Period | 3 years |  |
P R |  |  |
Income Tax Contingency [Line Items] |  |  |
Statute of limitations under income tax act | 4 years |  |
U S |  |  |
Income Tax Contingency [Line Items] |  |  |
Statute of limitations under income tax act | 3 years |  |
Income Tax Expense Section 382 | $ 2,300 |  |
Corporate Tax Rate | 35.00% |  |
Tax Reform Corporate Tax Rate | 21.00% |  |
Tax Reform Tax Rate Repatriation Of Liquid Assets | 15.50% |  |
Tax Reform Tax Rate On Base Erotions Payments | 10.00% |  |
Tax Reform Tax Rate Global Intangible Low Tax Income | 10.50% |  |
Section 382 Ownership Threshold | 50.00% |  |
V I |  |  |
Income Tax Contingency [Line Items] |  |  |
Statute of limitations under income tax act | 3 years |  |
First Ban Corp [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred Tax Assets Net | $ 294,800 |  |
Valuation allowance | 191,200 |  |
FirstBank [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred Tax Assets Current | 173,200 | 171,500 |
Deferred Tax Assets Net | 294,700 | 277,400 |
Valuation allowance | $ 150,700 | $ 171,000 |

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