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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]    
Federal Home Loan Bank Advances $ 325,000us-gaap_FederalHomeLoanBankAdvances $ 325,000us-gaap_FederalHomeLoanBankAdvances
Over one to three years    
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		  
Over three years    
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_FederalHomeLoanBankAdvancesMaturitiesDueOverThreeYearsMember