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FAIR VALUE - Impairment of Valuation Adjustments were Recorded for Assets Recognized at Fair Value (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Repayment rate used for the calculation of mortgage servicing rights value 31.56%us-gaap_FairValueInputsPrepaymentRate 32.00%us-gaap_FairValueInputsPrepaymentRate  
Discount rate used for calculation of mortgage servicing rights value 14.50%us-gaap_FairValueInputsDiscountRate 14.50%us-gaap_FairValueInputsDiscountRate  
Loans held for sale $ 81,723us-gaap_LoansReceivableHeldForSaleNet $ 76,956us-gaap_LoansReceivableHeldForSaleNet  
Mortgage Servicing Rights [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Repayment rate used for the calculation of mortgage servicing rights value 10.25%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_MortgageServicingRightsMember		   9.10%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_MortgageServicingRightsMember
Discount rate used for calculation of mortgage servicing rights value 10.62%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_MortgageServicingRightsMember		   10.61%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_MortgageServicingRightsMember