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LOAN PORTFOLIO - Activity for Specific Reserve (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Specific Reserve: |  |  |  |
Balance at beginning of period | $ 49,514 | $ 40,794 | $ 51,410 | $ 64,421
Provision for loan losses | 21,821 | 13,819 | 50,277 | 50,014
Financing Receivable Allowance For Credit Losses Net Write Offs Impaired Loans | (18,022) | (6,458) | (48,374) | (66,280)
Ending balance: specific reserve for impaired loans | $ 53,313 | $ 48,155 | $ 53,313 | $ 48,155

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

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- Definition Provision charged for the period based on estimated losses to be realized from impaired loan transactions. + References No definition available. + Details
Name: | fbp_ProvsionForLoanLossesExpensedImpairedLoans
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Schedule of activity for specific reserve. + References No definition available. + Details
Name: | fbp_ScheduleOfActivityForSpecificReserveAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant