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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investment securities available-for-sale:    
Discount rate used for calculation of mortgage servicing rights value 14.50%us-gaap_FairValueInputsDiscountRate 14.50%us-gaap_FairValueInputsDiscountRate
Fair value input prepayment rate 32.00%us-gaap_FairValueInputsPrepaymentRate 28.89%us-gaap_FairValueInputsPrepaymentRate
Unobservable input projected cumulative loss rate 7.90%fbp_FairValueInputsDefaultOfUnderlyingReference  
Securities available for sale    
Discount rate used for calculation of mortgage servicing rights value 14.50%us-gaap_FairValueInputsDiscountRate 14.50%us-gaap_FairValueInputsDiscountRate
Fair value input prepayment rate 32.00%us-gaap_FairValueInputsPrepaymentRate 28.89%us-gaap_FairValueInputsPrepaymentRate
Unobservable input projected cumulative loss rate 7.90%fbp_FairValueInputsDefaultOfUnderlyingReference  
Private Label Mbs [Member]    
Investment securities available-for-sale:    
Fair Value 33,648us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember		  
Discount rate used for calculation of mortgage servicing rights value 14.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember		  
Securities available for sale    
Fair Value 33,648us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember		  
Discount rate used for calculation of mortgage servicing rights value 14.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember		  
Puerto Rico Government Obligations [Member]    
Investment securities available-for-sale:    
Fair Value 2,564us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= fbp_PuertoRicoGovernmentObligationsMember		  
Unobservable input prepayment rate 5.61%fbp_UnobservableInputPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PuertoRicoGovernmentObligationsMember		  
Securities available for sale    
Fair Value 2,564us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= fbp_PuertoRicoGovernmentObligationsMember		  
Unobservable input prepayment rate 5.61%fbp_UnobservableInputPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PuertoRicoGovernmentObligationsMember		  
Discounted Cash Flow [Member] | Private Label Mbs [Member]    
Investment securities available-for-sale:    
Valuation technique Discounted cash flows  
Securities available for sale    
Valuation technique Discounted cash flows  
Discounted Cash Flow [Member] | Puerto Rico Government Obligations [Member]    
Investment securities available-for-sale:    
Valuation technique Discounted cash flows  
Securities available for sale    
Valuation technique Discounted cash flows  
Minimum [Member]    
Investment securities available-for-sale:    
Fair value input prepayment rate 19.89%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 15.86%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Securities available for sale    
Fair value input prepayment rate 19.89%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 15.86%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Private Label Mbs [Member]    
Investment securities available-for-sale:    
Fair value input prepayment rate 19.89%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Fair value projected Cumulative Loss Rate 0.64%fbp_FairValueInputsProjectedCumulativeLossRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Securities available for sale    
Fair value input prepayment rate 19.89%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Fair value projected Cumulative Loss Rate 0.64%fbp_FairValueInputsProjectedCumulativeLossRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Investment securities available-for-sale:    
Fair value input prepayment rate 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Securities available for sale    
Fair value input prepayment rate 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Private Label Mbs [Member]    
Investment securities available-for-sale:    
Fair value input prepayment rate 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Fair value projected Cumulative Loss Rate 80.00%fbp_FairValueInputsProjectedCumulativeLossRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Securities available for sale    
Fair value input prepayment rate 100.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Fair value projected Cumulative Loss Rate 80.00%fbp_FairValueInputsProjectedCumulativeLossRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember