Fair value of corporate bonds.

No definition available.

Name:	FBP_CorporateBondsFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of equity securities.

+ References

No definition available.

+ Details

Name:	FBP_EquitySecuritiesFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of government sponsored enterprise securities.

+ References

No definition available.

+ Details

Name:	FBP_GovernmentSponsoredEnterpriseSecuritiesFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of impaired loans covered by loss sharing arrangements.

+ References

No definition available.

+ Details

Name:	FBP_ImpairedLoansCoveredFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of impaired loans not covered by loss sharing arrangements.

+ References

No definition available.

+ Details

Name:	FBP_ImpairedLoansNonCoveredFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

fair value of other real estate covered by loss sharing agreements.

+ References

No definition available.

+ Details

Name:	FBP_OtherRealEstateCoveredFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of other real estate not covered by loss sharing agreements.

+ References

No definition available.

+ Details

Name:	FBP_OtherRealEstateNonCoveredFairValueDisclosure
Namespace Prefix:	FBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

+ Details

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

- Details

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

- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Mortgage-Backed Securities

-URI http://asc.fasb.org/extlink&oid=6517959

+ Details

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

Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Securities available for sale:
Securities available for sale	$ 172,535	$ 167,352	$ 161,407
Recurring \| Fair Value
Securities available for sale:
Government-sponsored enterprise securities	17,361	11,596
Mortgage-backed securities	147,523	146,926
Corporate bonds	3,651	3,813
Equity securities	4,000	5,017
Securities available for sale	172,535	167,352
Recurring \| Quoted Prices in Market for Identical Assets (Level 1)
Securities available for sale:
Government-sponsored enterprise securities
Mortgage-backed securities
Corporate bonds
Equity securities
Securities available for sale
Recurring \| Significant Other Observable Inputs (Level 2)
Securities available for sale:
Government-sponsored enterprise securities	17,361	11,596
Mortgage-backed securities	147,523	146,926
Corporate bonds	3,651	3,813
Equity securities	4,000	5,017
Securities available for sale	172,535	167,352
Recurring \| Significant Unobservable Inputs (Level 3)
Securities available for sale:
Government-sponsored enterprise securities
Mortgage-backed securities
Corporate bonds
Equity securities
Securities available for sale
Nonrecurring \| Fair Value
Securities available for sale:
Impaired loans - covered	21,378	12,234
Impaired loans - non-covered	13,263	21,021
Other real estate - covered	29,193	47,290
Other real estate - non-covered	15,098	26,285
Nonrecurring \| Quoted Prices in Market for Identical Assets (Level 1)
Securities available for sale:
Impaired loans - covered
Impaired loans - non-covered
Other real estate - covered
Other real estate - non-covered
Nonrecurring \| Significant Other Observable Inputs (Level 2)
Securities available for sale:
Impaired loans - covered
Impaired loans - non-covered
Other real estate - covered
Other real estate - non-covered
Nonrecurring \| Significant Unobservable Inputs (Level 3)
Securities available for sale:
Impaired loans - covered	21,378	12,234
Impaired loans - non-covered	13,263	21,021
Other real estate - covered	29,193	47,290
Other real estate - non-covered	$ 15,098	$ 26,285