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Legal Proceedings and Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Legal Proceedings and Contingencies [Abstract]
Receivable related to claims involving the same borrower for which the FDIC has denied the claims	$ 1.2fbp_ReceivableRelatedToClaimsInvolvingSameBorrowerForWhichFDICDeniedClaims

X

- Definition

Represents the amount of receivables related to claims involving the same borrower for which the FDIC has denied the claims because the FDIC disagrees with the collection strategy that the entity undertook.

+ References

No definition available.

+ Details

Name:	fbp_ReceivableRelatedToClaimsInvolvingSameBorrowerForWhichFDICDeniedClaims
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration