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LOAN PORTFOLIO - Narratives (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts Notes And Loans Receivable [Line Items]      
Additional interest income that would have realized $ 48.9us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans $ 40.3us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans $ 75.1us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Mortgages pledged as collateral 1,600.0us-gaap_LoansPledgedAsCollateral 1,700.0us-gaap_LoansPledgedAsCollateral  
Origination Fees [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans And Leases Receivable Deferred Income 9.3us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_DeferredRevenueArrangementTypeAxis
= fbp_OriginationFeesMember
7.6us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_DeferredRevenueArrangementTypeAxis
= fbp_OriginationFeesMember
 
Unearned Income [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans And Leases Receivable Deferred Income 35.1us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_DeferredRevenueArrangementTypeAxis
= fbp_UnearnedIncomeMember
40.4us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_DeferredRevenueArrangementTypeAxis
= fbp_UnearnedIncomeMember
 
Residential Mortgage [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Servicing of loans 2,300.0fbp_ServicingPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
2,100.0fbp_ServicingPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
 
Construction And Commercial Loans [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Servicing of loans 2.7fbp_ServicingPortfolio
/ us-gaap_FinancialInstrumentAxis
= fbp_ConstructionAndCommercialLoansMember
2.8fbp_ServicingPortfolio
/ us-gaap_FinancialInstrumentAxis
= fbp_ConstructionAndCommercialLoansMember
 
Commercial loan [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Servicing of loans $ 351.4fbp_ServicingPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
$ 446.0fbp_ServicingPortfolio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember