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ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Reserve for unfunded loan commitments | $ 700 | $ 700 | $ 1,600 |  |
Provision For Loan And Lease Losses |  | 144,254 | 86,733 | $ 172,045 |
Loans and leases receivable gross carrying value | 8,850,476 | 8,850,476 | 8,886,873 |  |
Financing Receivable Allowance For Credit Losses Write Offs |  | 134,770 | 136,928 |  |
Financing Receivable Allowance For Credit Losses | 231,843 | $ 231,843 | 205,603 | 240,710 |
P R |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Concentration Risk Percentage 1 |  | 75.00% |  |  |
V I |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Concentration Risk Percentage 1 |  | 6.00% |  |  |
U S |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Concentration Risk Percentage 1 |  | 19.00% |  |  |
Puerto Rico And Virgin Islands [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Loans and leases receivable gross carrying value | 7,200 | $ 7,200 |  |  |
Concentration Risk Percentage 1 |  | 81.00% |  |  |
Hurricane [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Provision For Loan And Lease Losses | 4,800 | $ 71,300 |  |  |
Commercial Loans Storm Related Individual Assesment Percentage |  | 80.00% |  |  |
Financing Receivable Allowance For Credit Losses | 68,500 | $ 68,500 |  |  | $ 66,500
Hurricane [Member] | P R |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses | 62,900 | 62,900 |  |  |
Hurricane [Member] | V I |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses | 5,600 | 5,600 |  |  |
Residential Mortgage [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Loans and leases receivable gross carrying value | 3,290,957 | 3,290,957 | 3,296,031 |  |
Financing Receivable Allowance For Credit Losses Write Offs |  | 28,186 | 33,621 |  |
Financing Receivable Allowance For Credit Losses | 58,975 | 58,975 | 33,980 | 39,570 |
Residential Mortgage [Member] | Hurricane [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses | 14,600 | 14,600 |  |  |
Commercial Mortgage [Member] | Hurricane [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses | 12,100 | 12,100 |  |  |
Commercial And Industrial [Member] | Hurricane [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses | 15,900 | 15,900 |  |  |
Construction Loans [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Loans and leases receivable gross carrying value | 111,397 | 111,397 | 124,951 |  |
Financing Receivable Allowance For Credit Losses Write Offs |  | 3,607 | 1,770 |  |
Financing Receivable Allowance For Credit Losses | 4,522 | 4,522 | 2,562 | 3,519 |
Construction Loans [Member] | Hurricane [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses Write Offs |  | 2,800 |  |  |
Financing Receivable Allowance For Credit Losses | 900 | 900 |  |  |
Consumer Loan [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Loans and leases receivable gross carrying value | 1,749,897 | 1,749,897 | 1,716,628 |  |
Financing Receivable Allowance For Credit Losses Write Offs |  | 44,030 | 54,504 |  |
Financing Receivable Allowance For Credit Losses | 70,982 | 70,982 | $ 49,847 | $ 60,642 |
Consumer Loan [Member] | Hurricane [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses | $ 25,000 | $ 25,000 |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico And Virgin Islands [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Concentration Risk Percentage 1 |  | 40.00% |  |  |
Residential And Consumer Loans [Member] | Puerto Rico And Virgin Islands [Member] |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |
Concentration Risk Percentage 1 |  | 60.00% |  |  |

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