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Employee Benefit Plans (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
401(k) Plan [Member] |  |  |
Description of plan | 401(k) Plan. The Company sponsors a retirement savings plan pursuant to Section 401(k) of the Internal Revenue Code. New employees who have met the age requirement are automatically enrolled in the plan at a 5% deferral rate on the next plan Entry Date. The automatic deferral can be modified by the employee at any time. |  |
Deferral rate | 5.00%fbp_DeferralRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember |  |
Percent of annual salary employees may contribute | 15.00%fbp_PercentOfAnnualSalaryEmployeesMayContribute / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember |  |
Percent matched by company up to 3 percent of employee salary | 100.00%fbp_PercentMatchedByCompanyUpTo3PercentOfEmployeeSalary / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember |  |
Percent matched by company 3-5 percent of employee salary | 50.00%fbp_PercentMatchedByCompany305PercentOfEmployeeSalary / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember |  |
Matching contributions | $ 1,400,000 fbp_MatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember | $ 1,400,000 fbp_MatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember | $ 1,200,000 fbp_MatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_Plan401kMember
Pension Plan [Member] |  |  |
Description of plan | Historically, the Company offered a noncontributory defined benefit retirement plan (the “Pension Plan”) that qualified under Section 401(a) of the Internal Revenue Code. The Pension Plan provided for a monthly payment, at normal retirement age of 65, equal to one-twelfth of the sum of (i) 0.75% of Final Average Annual Compensation (5 highest consecutive calendar years' earnings out of the last 10 years of employment) multiplied by the employee's years of service not in excess of 40 years, and (ii) 0.65% of Final Average Annual Compensation in excess of the average social security wage base multiplied by years of service not in excess of 35 years. Benefits were fully vested after five years of service. During the second quarter of 2009, the Company amended the Pension Plan to limit eligibility to employees hired prior to June 19, 2009. Effective December 31, 2012, the Company froze the Pension Plan for all participants. Although no previously accrued benefits were lost, employees no longer accrue benefits for service subsequent to 2012. |  |
Accumulated benefit obligation | 35,615,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember | 30,548,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember | 32,272,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember
Expected average annual rate of return, minimum | 7.00%fbp_ExpectedAverageAnnualRateOfReturnMinimum / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember |  |
Expected average annual rate of return, maximum | 10.00%fbp_ExpectedAverageAnnualRateOfReturnMaximum / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember |  |
Pension Plan [Member] | Equities [Member] |  |  |
Pension plans allocated assets (percentage) | 75.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_EquitySecurities1Member / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember |  |
Pension Plan [Member] | Fixed Income [Member] |  |  |
Pension plans allocated assets (percentage) | 25.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_PensionPlanMember |  |
SERP [Member] |  |  |
Description of plan | The purpose of the SERP wa s to provide additional monthly pension benefits to ensure that each such senior management executive would receive lifetime monthly pension benefits equal to 3% of his or her final average compensation multiplied by his or her years of service (maximum of 20 years) to the Company or its subsidiaries, subject to a maximum of 60% of his or her final average compensation. The amount of a participant's monthly SERP benefit is reduced by (i) the amount payable under the Company's qualified Pension Plan (described above), and (ii) 50% of the participant's primary social security benefit. Final average compensation means the average of the 5 highest consecutive calendar years of earnings during the last 10 years of service prior to termination of employment. The SERP is an unfunded plan. Payments are made from the general assets of the Company.Effective December 31, 2012, the Company froze the SERP to all participants. Although no previously accrued benefits were lost, participants no longer accrue benefits for service subsequent to 2012. |  |
Accumulated benefit obligation | $ 5,216,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_SerpPlanCurrentYearMember | $ 5,292,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_SerpPlanCurrentYearMember | $ 6,813,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fbp_SerpPlanCurrentYearMember

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- Definition The automatic rate of deferral for employees enrolled in a defined contribution plan. + References No definition available. + Details
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- Definition The maximum expected average annual rate of return on investments. + References No definition available. + Details
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- Definition The minimum expected average annual rate of return on investments. + References No definition available. + Details
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- Definition The amount matched by the company under a defined contribution plan. + References No definition available. + Details
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- Definition The percent matched by company in the range of 3 to 5 percent of employee salary. + References No definition available. + Details
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- Definition The percent matched by company up to 3 percent of employee salary for the defined contribution plan. + References No definition available. + Details
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- Definition The percentage amount of annual salary employees may contribute to the defined contribution plan. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6510416 + Details
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