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Securities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Securities [Abstract]
Collateralized mortage obligations, amortized cost	$ 95,000fbp_CollateralizedMortageObligationsAmortizedCost		$ 108,000fbp_CollateralizedMortageObligationsAmortizedCost
Collateralized mortage obligations, fair value	97,000fbp_CollateralizedMortageObligationsFairValue		111,000fbp_CollateralizedMortageObligationsFairValue
Federal Home Loan Bank Stock, cost	5,871,000us-gaap_FederalHomeLoanBankStock		6,016,000us-gaap_FederalHomeLoanBankStock
Investment securities, pledged as collateral for public deposits	91,904,000us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments		100,113,000us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments
Net realized gains of investment securities

X

- Definition

The amortized cost of collateralized mortgage obligations.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value of collateralized mortgage obligations.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

+ Details

Name:	us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 325

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809

+ Details

Name:	us-gaap_FederalHomeLoanBankStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity.

+ References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration