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Equity-Based Compensation Plans (Narrative) (Details) (USD $)
3 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2012
Feb. 11, 2014
Sep. 30, 2012
Feb. 24, 2015
Dec. 31, 2014
Stock based compensation expense $ 127,000us-gaap_AllocatedShareBasedCompensationExpense $ 23,800us-gaap_AllocatedShareBasedCompensationExpense          
Stock based compensation, income tax benefit 49,500fbp_StockBasedCompensationIncomeTaxBenefit 9,300fbp_StockBasedCompensationIncomeTaxBenefit          
Stock options [Member] | CEO [Member]              
Grants in period (options)     75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
       
Restricted Stock [Member] | CEO [Member]              
Vesting period       2 years      
Grants in period (options)         40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Restricted Stock [Member] | Senior Executives [Member]              
Total compensation expense associated with senior executives grants 23,300us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
        258,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
 
Subsequent quarter compensation expense associated with senior executives grants 23,300fbp_SubsequentQuarterCompensationExpenseAssociatedWithSeniorExecutivesGrants
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
           
Percent of bonus earned under the incentive plan in shares of restricted stock             50.00%fbp_PercentOfBonusEarnedUnderIncentivePlanInSharesOfRestrictedStock
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
Grants in period (options)           14,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
 
Restricted Stock [Member] | Eleven senior officers [Member]              
Total compensation expense associated with senior executives grants 80,500us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_ElevenSeniorOfficersMember
        527,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_ElevenSeniorOfficersMember
 
Subsequent quarter compensation expense associated with senior executives grants 80,500fbp_SubsequentQuarterCompensationExpenseAssociatedWithSeniorExecutivesGrants
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_ElevenSeniorOfficersMember
           
Grants in period (options)           30,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_ElevenSeniorOfficersMember
 
First Bancorp Plans [Member]              
Exercise price range - floor $ 14.35us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpPlansMember
           
Exercise prices range - ceiling $ 22.12us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpPlansMember
           
Shares remaining available for grant 959,632us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpPlansMember
           
First Bancorp 2007 Equity Plan [Member]              
Director equity grants granted, value 16,000fbp_DirectorEquityGrants
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
           
First Bancorp 2007 Equity Plan [Member] | February 2014 Award [Member]              
Total compensation expense associated with senior executives grants       278,200us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= fbp_FebruaryCurrentYearAwardMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
     
Stock based compensation expense 23,200us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= fbp_FebruaryCurrentYearAwardMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
           
Subsequent quarter compensation expense associated with senior executives grants $ 23,200fbp_SubsequentQuarterCompensationExpenseAssociatedWithSeniorExecutivesGrants
/ us-gaap_AwardTypeAxis
= fbp_FebruaryCurrentYearAwardMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
$ 23,200fbp_SubsequentQuarterCompensationExpenseAssociatedWithSeniorExecutivesGrants
/ us-gaap_AwardTypeAxis
= fbp_FebruaryCurrentYearAwardMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember