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OTHER REAL ESTATE OWNED- Additional information (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Other Real Estate And Foreclosed Assets [Abstract] |  |
Transfers From Loans To Other Receivable | $ 21,300,000 | $ 15,000,000

X
- Definition Amount of foreclosures completed that meet the conditions of ASC 310-40 and are presented as a receivable (other assets) in the statement of financial condition. + References No definition available. + Details
Name: | fbp_TransfersFromLoansToOtherReceivable
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OtherRealEstateAndForeclosedAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration