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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]    
Federal Home Loan Bank Advances $ 325,000us-gaap_FederalHomeLoanBankAdvances $ 300,000us-gaap_FederalHomeLoanBankAdvances
Federal Home Loan Bank Advances Maturities Due From One To Three Years [Member]    
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]    
Federal Home Loan Bank Advances 300,000us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= fbp_FederalHomeLoanBankAdvancesMaturitiesDueFromOneToThreeYearsMember		  
FederalHomeLoanBankAdvancesMaturitiesDueFromThreeToFiveYears [Member]    
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]    
Federal Home Loan Bank Advances $ 25,000us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= fbp_FederalhomeloanbankadvancesmaturitiesduefromthreetofiveyearsMember