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LOAN PORTFOLIO - Activity for Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impaired Loans: |  |  |  |
Balance at beginning of period |  | $ 887,905 | $ 806,509 | $ 945,407
Loans determined impaired during the period |  | 140,977 | 288,202 | 160,837
Charge-offs | [1] | (82,113) | (67,210) | (99,023)
Impaired Loans Sold |  | (53,245) | (8,675) | (67,836)
Impaired Loans Transferred from (to) Held For Sale |  | 0 | 0 | 40,005
Increases to impaired loans (disbursements) |  | 8,292 | 3,236 | 3,340
Foreclosures |  | (37,513) | (36,161) | (57,728)
Loans no longer considered impaired |  | (3,526) | (27,643) | (46,489)
Paid in full or partial payments |  | (70,469) | (70,353) | (72,004)
Balance at end of period |  | $ 790,308 | $ 887,905 | $ 806,509
[1] | For the year ended December 31, 2017, includes a charge-off of $10.7 million related to the sale of the PREPA credit line, as further discussed below. For the year ended December 31, 2016, includes $4.2 million of charge-offs related to impaired loans included in a sale of a $16.3 million pool of non-performing assets and, for the year ended December 31, 2015, includes $63.9 million of charge-offs related to a bulk sales of assets, as further discussed below.

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- Definition Amount of direct write-downs of financing receivables charged against the allowance related to impaired loans. + References No definition available. + Details
Name: | fbp_FinancingReceivableAllowanceForCreditLossesWriteOffsImpairedLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of real estate investments acquired through foreclosure during the period related to impaired loans. + References No definition available. + Details
Name: | fbp_ForeclosuresOfImpairedLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impaired Commercial Loan Statistic [Abstract] + References No definition available. + Details
Name: | fbp_ImpairedCommercialLoanStatisticAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of loans determined to be impaired during the period. + References No definition available. + Details
Name: | fbp_ImpairedFinancingReceivableDeterminedDuringPeriod
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disbursements during the period on existing commitments of Impaired loans. + References No definition available. + Details
Name: | fbp_ImpairedFinancingReceivableIncreasesDuringPeriod
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Principal repayments related to Impaired Loans. + References No definition available. + Details
Name: | fbp_ImpairedFinancingReceivablePaidOrPartialPayments
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of loans no longer reported as Impaired loans. + References No definition available. + Details
Name: | fbp_ImpairedLoansRemoved
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Impaired loans sold during the period. + References No definition available. + Details
Name: | fbp_ImpairedLoansSold
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Imapired loans transferred from (to) loans held for sale during the period. + References No definition available. + Details
Name: | fbp_ImpairedLoansTransferredToHeldForSale
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant