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Commitments, Contingencies, and Concentrations of Credit Risk (Schedule of Outstanding Loan Commitments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Outstanding closed-end loan commitments	$ 185fbp_OutstandingClosedendLoanCommitments
Unfunded commitments on revolving lines of credit, credit cards and home equity loans	256fbp_UnfundedCommitmentsOnRevolvingLinesOfCreditCreditCardsAndHomeEquityLoans
Commitments, total	441fbp_CommitmentsTotal
Fixed Rate [Member]
Outstanding closed-end loan commitments	56fbp_OutstandingClosedendLoanCommitments / us-gaap_ConcentrationRiskByTypeAxis = fbp_FixedRateMember
Unfunded commitments on revolving lines of credit, credit cards and home equity loans	65fbp_UnfundedCommitmentsOnRevolvingLinesOfCreditCreditCardsAndHomeEquityLoans / us-gaap_ConcentrationRiskByTypeAxis = fbp_FixedRateMember
Commitments, total	121fbp_CommitmentsTotal / us-gaap_ConcentrationRiskByTypeAxis = fbp_FixedRateMember
Variable Rate [Member]
Outstanding closed-end loan commitments	129fbp_OutstandingClosedendLoanCommitments / us-gaap_ConcentrationRiskByTypeAxis = fbp_VariableRateMember
Unfunded commitments on revolving lines of credit, credit cards and home equity loans	191fbp_UnfundedCommitmentsOnRevolvingLinesOfCreditCreditCardsAndHomeEquityLoans / us-gaap_ConcentrationRiskByTypeAxis = fbp_VariableRateMember
Commitments, total	$ 320fbp_CommitmentsTotal / us-gaap_ConcentrationRiskByTypeAxis = fbp_VariableRateMember

X

- Definition

The total amount of off-balance sheet lending-related financial instruments (e.g., commitments), which represents the maximum possible credit risk should the counterparty draw upon the commitment.

+ References

No definition available.

+ Details

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

X

- Definition

The off-balance sheet contractual amount of lending-related commitments for closed-end loans.

+ References

No definition available.

+ Details

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

X

- Definition

The off-balance sheet amount of unfunded revolving lines of credit, credit cards and home equity loan commitments.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=fbp_VariableRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: