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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Commitments $ 1,100.0us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure      
Percentage Of Trust Preferred Securities That Qualify As Tier 1 Capital   0.00%fbp_PercentageOfTrustPreferredSecuritiesThatQualifyAsTier1Capital 25.00%fbp_PercentageOfTrustPreferredSecuritiesThatQualifyAsTier1Capital  
Four Major Risk Weightings Categories (0%, 20%, 50%, and 100%)      
Credit Cards [Member]        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Commitments 645.6us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ fbp_CommitmentsAxis
= fbp_CreditCardsMember
     
Commercial And Financial Standby Letters Of Credit [Member]        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Commitments 44.5us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ fbp_CommitmentsAxis
= fbp_CommercialAndFinancialStandbyLettersOfCreditMember
     
Basel III [Member]        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Common Equity Tier1 Capital To Risk Weight Assets Ratio 4.50%fbp_CommonEquityTier1CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Common Equity Tier 1 Capital Conservation Buffer 2.50%fbp_CommonEquityTier1CapitalConservationBuffer
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Common Equity Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 7.00%fbp_CommonEquityTier1CapitalToRiskWeightAssetsRatioPlusCommonEquityTier1CapitalConservationBuffer
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Total Tier 1 Capital To Risk Weight Assets Ratio 6.00%fbp_TotalTier1CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Total Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 8.50%fbp_TotalTier1CapitalToRiskWeightAssetsRatioPlusCommonEquityTier1CapitalConservationBuffer
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Total Tier 1 Capital And Tier 2 Capital To Risk Weight Assets Ratio 8.00%fbp_TotalTier1CapitalAndTier2CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Total Tier 1 Capital And Tier 2 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 10.50%fbp_TotalTier1CapitalAndTier2CapitalToRiskWeightAssetsRatioPlusCommonEquityTier1CapitalConservationBuffer
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Leverage Ratio 4.00%fbp_LeverageRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Common Equity Tier 1 Capital Conservation Buffer First Year 0.625%fbp_CommonEquityTier1CapitalConservationBufferFirstYear
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Threshold For Deductions Of Certain Items From Common Equity Tier 1 Capital 10.00%fbp_ThresholdForDeductionsOfCertainItemsFromCommonEquityTier1Capital
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Threshold For Total Deductions From Common Equity Tier 1 Capital 15.00%fbp_ThresholdForTotalDeductionsFromCommonEquityTier1Capital
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Trust Preferred Securities $ 225fbp_TrustPreferredSecurities
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Percentage Of Trust Preferred Securities That Qualify As Tier 1 Capital 25.00%fbp_PercentageOfTrustPreferredSecuritiesThatQualifyAsTier1Capital
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Leverage Ratio Composite Rating 3.00%fbp_LeverageRatioCompositeRating
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Risk Weightings 150.00%fbp_RiskWeightings
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Supervisory Rating 1.00%fbp_SupervisoryRating
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Basel III [Member] | Well Capitalized [Member]        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Tier 1 risk based capital ratio to be considered well capitalzed under PCA 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= fbp_WellCapitalizedMember
     
Tier 1 Common equity ratio to be considered well capitalized 6.50%fbp_TierOneCommonEquityRatioWellCapitalized
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= fbp_WellCapitalizedMember
     
FirstBank [Member]        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Leverage ratio 13.28%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
    13.04%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
Tier 1 risk based capital ratio 17.61%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
    18.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
Total Risk Based Capital Ratio 18.89%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
    19.37%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
Tier 1 risk based capital ratio to be considered well capitalzed under PCA 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
    6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
Total risk based capital to be considered well capitalized under PCA 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
    10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
Leverage ratio to be considered well capitalized under PCA 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
    5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= fbp_FirstbankMember
Common Equity Tier1 Capital To Risk Weight Assets Ratio 15.62%fbp_CommonEquityTier1CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_FirstbankMember