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LOAN PORTFOLIO - Activity for Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Impaired Loans: |  |  |  |  |
Balance at beginning of period | $ 740,134 | $ 735,625 | $ 790,308 |  | $ 887,905
Loans determined impaired during the period | 119,064 | 71,884 | 214,745 |  | 110,488
Charge-offs | (18,035) | (6,472) | (48,455) | [1] | (66,959)
Loans sold, net charge-offs | 0 | 0 | (4,121) |  | (53,245)
Increases to existing impaired loans | 128 | 3,215 | 7,203 |  | 4,454
Foreclosures | (8,293) | (5,657) | (27,745) |  | (36,347)
Loans no longer considered impaired | (1,146) | (542) | (5,086) |  | (3,324)
Loans transferred to held for sale | (16,839) | 0 | (74,052) |  | 0
Paid in full or partial payments | (27,003) | (18,794) | (64,787) |  | (63,713)
Balance at end of period | $ 788,010 | $ 779,259 | $ 788,010 |  | $ 779,259
[1] | For the nine-month period ended September 30, 2017 includes a charge-off of $10.7 million related to the sale of the PREPA credit line 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: | credit
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: | credit
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 quarter. + 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 Impaired loans transferred 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: | credit
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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