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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended
Feb. 16, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 02, 2010
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Proceeds from sale of available-for-sale securities       $ 4,861,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 1,878,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Loans acquired on exchange of loan held for sale 136,100,000fbp_LoansAcquiredOnExchangeOfLoanHeldForSale            
Subordinated interest in CPS/GS by Bank 35.00%us-gaap_VariableInterestEntityOwnershipPercentage            
Common Equity Tier 1 Capital To Risk Weight Assets Ratio       6.00%fbp_CommonEquityTier1CapitalToRiskWeightAssetsRatio      
Trust Preferred Securities       225,000,000fbp_TrustPreferredSecurities      
Leverage Ratio Composite Rating       1.00%fbp_LeverageRatioCompositeRating      
Four Major Risk Weightings Categories       (0%, 20%, 50%, and 100%)      
Leverage Ratio Composite Supervisory Rating       3.00%fbp_LeverageRatioCompositeSupervisoryRating      
Percentage Of Trust Preferred Securities That Qualify As Tier1 Capital   0.00%fbp_PercentageOfTrustPreferredSecuritiesThatQualifyAsTier1Capital 25.00%fbp_PercentageOfTrustPreferredSecuritiesThatQualifyAsTier1Capital        
Minimum [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Percentage of risk weighted assets       0.00%fbp_RiskWeightingPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Risk Weightings       0.00%fbp_RiskWeightings
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Risk Weightings       100.00%fbp_RiskWeightings
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Consent Order [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Total Risk Based Capital Ratio             12.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fbp_ConsentOrderMember
Basel III [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Common Equity Tier 1 Capital Conservation Buffer       2.50%fbp_CommonEquityTier1CapitalConservationBuffer
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Common Equity Tier 1 Capital Conservation Buffer First Year       0.625%fbp_CommonEquityTier1CapitalConservationBufferFirstYear
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Common Equity Tier 1 Capital Conservation Buffer Increments Period       4 years 0 months 0 days      
Threshold For Deductions Of Certain Items From Common Equity Tier1 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
     
Common Equity Tier1 Capital To Risk Weight Assets Ratio Well Capitalized       6.50%fbp_CommonEquityTier1CapitalToRiskWeightAssetsRatioWellCapitalized
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Total Tier 1 Capital To Risk Weight Assets Ratio Well Capitalized       8.00%fbp_TotalTier1CapitalTotalTier1CapitalToRiskWeightAssetsRatioWellCapitalized
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Credit Conversion Factor       20.00%fbp_CreditConversionFactor
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Adjustments And Deductions From Common Equity Tier 1 Capital Period       4 years 0 months 0 days      
Unused Portion Of Commitment Maturity Period       1 year 0 months 0 days      
Percentage Of Trust Preferred Securities That Qualify As Tier1 Capital       25.00%fbp_PercentageOfTrustPreferredSecuritiesThatQualifyAsTier1Capital
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
     
Basel III [Member] | Minimum [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Common Equity Tier 1 Capital To Risk Weight Assets Ratio       4.50%fbp_CommonEquityTier1CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Common equity tier 1 capital to risk weight assets ratio plus common equity tier1 capital conservation buffer       7.00%fbp_Commonequitytier1capitaltoriskweightassetsratiopluscommonequitytier1capitalconservationbuffer
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Total Tier 1 Capital To Risk Weight Assets Ratio       6.00%fbp_TotalTier1CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
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
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
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
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Leverage Ratio       4.00%fbp_LeverageRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Total Tier1 Capital And Tier 2 Capital To Risk Weight Assets Ratio       8.00%fbp_TotalTier1CapitalAndTier2CapitalToRiskWeightAssetsRatio
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Leverage Ratio Well Capitalized       5.00%fbp_LeverageRatioWellCapitalized
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Basel III [Member] | Maximum [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Risk Weightings       150.00%fbp_RiskWeightings
/ dei_LegalEntityAxis
= fbp_BaselIiiMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Cpg Gs [Member]              
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]              
Sale of loans to CPG/GS 269,300,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ dei_LegalEntityAxis
= fbp_CpgGsMember
           
Cash realized on sale of loan $ 88,500,000us-gaap_ProceedsFromSaleOfLoansHeldForSale
/ dei_LegalEntityAxis
= fbp_CpgGsMember