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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Interest Rate Swaps (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Pay fixed/receive floating :    
Notional amount $ 111,058invest_DerivativeNotionalAmount $ 98,704invest_DerivativeNotionalAmount
Interest Rate Swap [Member]    
Pay fixed/receive floating :    
Notional amount $ 5,440invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 5,440invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Derivative Receivable [Member]    
Pay fixed/receive floating :    
Weighted-average receive rate at period end 2.04%us-gaap_DerivativeAverageVariableInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fbp_DerivativeReceivableMember		 2.03%us-gaap_DerivativeAverageVariableInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fbp_DerivativeReceivableMember
Derivative Payable [Member]    
Pay fixed/receive floating :    
Weighted-average pay rate at period end 3.45%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fbp_DerivativePayableMember		 3.45%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fbp_DerivativePayableMember