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Fair Value of Financial Instruments (Level 3 assets and liabilities measured at fair value) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Impaired Loans - Covered [Member]
Impaired loans - covered	$ 5,220fbp_ImpairedLoansCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember	$ 15,284fbp_ImpairedLoansCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember
Valuation technique	Appraised value; PV of expected cash flows	Appraised value
Significant unobservable inputs	Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell	Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell
General range of significant input values, minimum	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember
General range of significant input values, maximum	10.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember	10.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember
Impaired Loans - Non - Covered [Member]
Impaired loans - non-covered	20,512fbp_ImpairedLoansNonCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember	13,020fbp_ImpairedLoansNonCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember
Valuation technique	Appraised value; PV of expected cash flows	Appraised value
Significant unobservable inputs	Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell	Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell
General range of significant input values, minimum	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember
General range of significant input values, maximum	10.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember	37.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember
Foreclosed Real Estate - Covered [Member]
Other real estate - covered	2,350fbp_OtherRealEstateCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember	24,497fbp_OtherRealEstateCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember
Valuation technique	Appraised value; independent market prices	Appraised value
Significant unobservable inputs	Discounts to reflect current market conditions and estimated costs to sell	Discounts to reflect current market conditions and estimated costs to sell
General range of significant input values, minimum	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember
General range of significant input values, maximum	10.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember	10.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember
Foreclosed Real Estate - Non-Covered [Member]
Other real estate - non-covered	$ 9,771fbp_OtherRealEstateNonCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember	$ 12,251fbp_OtherRealEstateNonCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember
Valuation technique	Appraised value; independent market prices	Appraised value
Significant unobservable inputs	Discounts to reflect current market conditions, abbreviated holding period and estimated costs to sell	Discounts to reflect current market conditions, abbreviated holding period and estimated costs to sell
General range of significant input values, minimum	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember	0.00%fbp_GeneralRangeOfSignificantInputValuesMinimum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember
General range of significant input values, maximum	40.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember	40.00%fbp_GeneralRangeOfSignificantInputValuesMaximum / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember

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- Definition

The maximum general range of significant unobservable input values.

+ References

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- Definition

Fair value of impaired loans covered by loss sharing arrangements.

+ References

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

Description of significant assumptions used by management to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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