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

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- 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

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- References

No definition available.

+ Details

Name:	fbp_RegulatoryRestrictionsDisclosureAbstract
Namespace Prefix:	fbp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- 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