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NATURAL DISASTERS- Additional information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017
Liability For Catastrophe Claims [Line Items] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  | $ 231,843 | $ 231,843 | $ 231,843 | $ 205,603 | $ 240,710 |
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest | [1],[2],[3] | 489,554 | 489,554 | 489,554 | 560,094 |  |
Marketing And Advertising Expense |  |  |  | 12,485 | 11,419 | 15,234 |
Provision For Loan And Lease Losses |  |  |  | 144,254 | 86,733 | $ 172,045 |
Increase Decrease In Deposits Excluding Brokered Certificates Of Deposits |  | 361,500 |  |  |  |  |
Increase Decrease In Non Interest Bearing Demand Deposits |  | $ 247,500 |  |  |  |  |
Percentage Of Non Interest Bearing Demand Deposits |  | 16.00% |  |  |  |  |
Hurricane [Member] |  |  |  |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses |  | $ 68,500 | 68,500 | 68,500 |  |  | $ 66,500
Loss Contingency Receivable |  | 4,800 | 4,800 | 4,800 |  |  |
Loss And Expenses Catastrophic Events |  |  |  | 7,200 |  |  |
Disaster Response Plan Costs |  |  |  | 6,600 |  |  |
Other Real Estate Owned Storm Related Expenses Not Recoverable |  |  |  | 2,500 |  |  |
Provision For Loan And Lease Losses |  | 4,800 |  | $ 71,300 |  |  |
Hurricane Category Five Description |  |  |  | Category 5 hurricane |  |  |
Hurricane Category Four Description |  |  |  | Category 4 hurricane |  |  |
Residential Mortgage [Member] |  |  |  |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |  |  |  |
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest Additions |  |  | 23,000 |  |  |  |
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest |  | 178,291 | 178,291 | $ 178,291 | 160,867 |  |
Consumer Loan [Member] |  |  |  |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |  |  |  |
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest |  | 5,370 | 5,370 | 5,370 | $ 8,399 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |  |  |  |
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest Additions |  |  | 59,400 |  |  |  |
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest |  | $ 294,400 | $ 294,400 | $ 294,400 |  |  |
[1] | Amount excludes PCI loans with a carrying value of approximately $158.2 million and $165.8 million as of December 31, 2017 and 2016, respectively, primarily mortgage loans acquired from Doral Bank in the first quarter of 2015 and from Doral Financial in the second quarter of 2014, as further discussed below. These loans are not considered non-performing due to the application of the accretion method, under which these loans will accrete interest income over the remaining life of the loans using an estimated cash flow analysis.
[2] | Excludes $8.3 million and $8.1 million of non-performing loans held for sale as of December 31, 2017 and 2016, respectively.
[3] | Non-performing loans exclude $374.7 million and $384.9 million of TDR loans that are in compliance with the modified terms and in accrual status as of December 31, 2017 and 2016, respectively.

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