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Equity-Based Compensation Plans (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2012
Feb. 11, 2014
Feb. 23, 2012
Feb. 24, 2011
Stock based compensation expense $ 270,000us-gaap_AllocatedShareBasedCompensationExpense $ 222,000us-gaap_AllocatedShareBasedCompensationExpense $ 311,000us-gaap_AllocatedShareBasedCompensationExpense          
Stock based compensation, income tax benefit 105,000fbp_StockBasedCompensationIncomeTaxBenefit 87,000fbp_StockBasedCompensationIncomeTaxBenefit 121,000fbp_StockBasedCompensationIncomeTaxBenefit          
Proceeds from stock options exercised 70,000us-gaap_ProceedsFromStockOptionsExercised              
Non-Employee Directors [Member]                
Stock based compensation expense 177,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
             
Equity grants   13,164us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
25,452us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
         
Fair value of equity grant, per share   $ 14.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
$ 8.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
         
Equity grants in period (per director)   1,097fbp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedPerDirector
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
1,818fbp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedPerDirector
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
         
Senior Executives [Member]                
Stock based compensation expense 93,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
             
Equity grants     9,559us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
         
Fair value of equity grant, per share     $ 10.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_TitleOfIndividualAxis
= fbp_SeniorExecutivesMember
         
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
       
Fair value of equity grant, per share       $ 3.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
       
Restricted Stock [Member] | CEO [Member]                
Vesting period 2 years              
Equity grants 15,657us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
             
Grants in period (options)         40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
     
Fair value of equity grant, per share $ 17.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
      $ 9.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
     
Common Stock [Member] | Non-Employee Directors [Member]                
Equity grants 10,065us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
             
Fair value of equity grant, per share $ 17.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
             
Equity grants in period (per director) 915fbp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedPerDirector
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= fbp_NonEmployeeDirectorsMember
             
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 989,935us-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 92,800us-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
             
First Bancorp 2007 Equity Plan [Member] | February 2012 Awards [Member]                
Total compensation expense associated with senior executives grants             58,900us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= fbp_February2012AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
 
Stock based compensation expense 600us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= fbp_February2012AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
20,900us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= fbp_February2012AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
37,400us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= fbp_February2012AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
         
First Bancorp 2007 Equity Plan [Member] | February 2011 Awards [Member]                
Total compensation expense associated with senior executives grants               89,600us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= fbp_February2011AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
Stock based compensation expense   $ 6,500us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= fbp_February2011AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember
$ 41,400us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= fbp_February2011AwardsMember
/ us-gaap_PlanNameAxis
= fbp_FirstBancorpEquityPlanMember