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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financial Information [Line Items]      
Residential mortgage loans, mainly secured by first mortgages $ 3,331,620us-gaap_LoansAndLeasesReceivableConsumerMortgage $ 3,011,187us-gaap_LoansAndLeasesReceivableConsumerMortgage  
Commercial loans:      
Construction loans 124,440us-gaap_LoansReceivableCommercialConstruction 123,480us-gaap_LoansReceivableCommercialConstruction  
Commercial mortgage loans 1,649,263us-gaap_LoansReceivableCommercialMortgage 1,665,787us-gaap_LoansReceivableCommercialMortgage  
Commercial and Industrial loans 2,442,867us-gaap_LoansReceivableCommercialAndIndustrial [1] 2,479,437us-gaap_LoansReceivableCommercialAndIndustrial [1]  
Loans to local financial institutions collateralized by real estate mortgages 0us-gaap_LoansReceivableCommercialFinancialInstitutions 0us-gaap_LoansReceivableCommercialFinancialInstitutions  
Commercial loans 4,216,570us-gaap_LoansAndLeasesReceivableCommercial 4,268,704us-gaap_LoansAndLeasesReceivableCommercial  
Finance leases 230,183us-gaap_LoansAndLeasesReceivableConsumerLeaseFinancing 232,126us-gaap_LoansAndLeasesReceivableConsumerLeaseFinancing  
Consumer loans 1,706,999us-gaap_LoansAndLeasesReceivableConsumerOther 1,750,419us-gaap_LoansAndLeasesReceivableConsumerOther  
Loans held for investment 9,485,372us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 9,262,436us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 9,566,785us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less: allowance for loan and lease losses (226,064)us-gaap_LoansAndLeasesReceivableAllowance (222,395)us-gaap_LoansAndLeasesReceivableAllowance  
Loans held for investment, net 9,259,308us-gaap_LoansAndLeasesReceivableNetReportedAmount 9,040,041us-gaap_LoansAndLeasesReceivableNetReportedAmount  
Commercial And Industrial [Member]      
Commercial loans:      
Loans held for investment $ 2,442,867us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_CommercialAndIndustrialMember
$ 2,479,437us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_CommercialAndIndustrialMember
 
[1] As of March 31, 2015 and December 31, 2014, includes $1.1 billion of commercial loans that are secured by real estate but are not dependent upon the real estate for repayment.