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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
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Dec. 31, 2014 | Dec. 31, 2013
Impaired Loans - Covered [Member] |  |
Impaired loans - covered | $ 5,220 fbp_ImpairedLoansCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansCoveredMember | $ 15,284 fbp_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 | 20,512 fbp_ImpairedLoansNonCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ImpairedLoansNonCoveredMember | 13,020 fbp_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 | 2,350 fbp_OtherRealEstateCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateCoveredMember | 24,497 fbp_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 | $ 9,771 fbp_OtherRealEstateNonCoveredFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fbp_ForeclosedRealEstateNonCoveredMember | $ 12,251 fbp_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 No definition available. + Details
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- Definition The minimum general range of significant unobservable input values. + References No definition available. + Details
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- Definition Fair value of impaired loans covered by loss sharing arrangements. + References No definition available. + Details
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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. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References 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 + Details
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