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Regulatory Restrictions (Narrative) (Details)	Dec. 31, 2016 USD ($)
Regulatory Restrictions [Abstract]
Undivided profits	$ 173,823,000
Restricted investment in bank	241,600,000
Average reserve balance	$ 1,746,000

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

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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

X

- Definition

The amount of undivided profits available for the payment of dividends subject to remaining in compliance with regulatory capital requirements.

+ References

No definition available.

+ Details

Name:	fbp_UndividedProfits
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant