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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
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
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 31.56%us-gaap_FairValueInputsPrepaymentRate 32.00%us-gaap_FairValueInputsPrepaymentRate
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 31.56%us-gaap_FairValueInputsPrepaymentRate 32.00%us-gaap_FairValueInputsPrepaymentRate
Private Label Mbs [Member]    
Investment securities available-for-sale:    
Fair Value 31,824us-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 31,824us-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		  
US States And Political Subdivisions Member [Member]    
Investment securities available-for-sale:    
Fair Value 2,390us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Unobservable input prepayment rate 2.89%fbp_UnobservableInputPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities available for sale    
Fair Value 2,390us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Unobservable input prepayment rate 2.89%fbp_UnobservableInputPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Discounted Cash Flow [Member] | Private Label Mbs [Member]    
Investment securities available-for-sale:    
Valuation technique Discounted cash flow  
Securities available for sale    
Valuation technique Discounted cash flow  
Discounted Cash Flow [Member] | US States And Political Subdivisions Member [Member]    
Investment securities available-for-sale:    
Valuation technique Discounted cash flow  
Securities available for sale    
Valuation technique Discounted cash flow  
Minimum [Member]    
Investment securities available-for-sale:    
Fair value input prepayment rate 18.04%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 19.89%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Securities available for sale    
Fair value input prepayment rate 18.04%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 19.89%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 18.04%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Fair value projected Cumulative Loss Rate 0.00%fbp_FairValueInputsProjectedCumulativeLossRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Securities available for sale    
Fair value input prepayment rate 18.04%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FairValueByAssetClassAxis
= fbp_PrivateLabelMbsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Fair value projected Cumulative Loss Rate 0.00%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