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v3.8.0.1

FAIR VALUE - Additional Information (Detail) | Dec. 31, 2017 USD ($)
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Debt Instrument [Line Items] |
Maximum amount of interest in brokered CD sold by broker | $ 250,000

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- Definition Maximum amount of cash insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration