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Regulatory Restrictions (Narrative) (Details) | Dec. 31, 2017 USD ($)
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Regulatory Restrictions [Abstract] |
Restricted investment in bank | $ 580,000,000
Average reserve balance | $ 9,924,000

X
- Definition The average reserve balance maintained by the bank under requirements of the Federal Reserve Board. + References No definition available. + Details
Name: | fbp_AverageReserveBalance
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | fbp_RegulatoryRestrictionsDisclosureAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of restricted investment in bank as to transfer to the company without obtaining prior regulatory approval. + References No definition available. + Details
Name: | fbp_RestrictedInvestmentInBank
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant