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INCOME TAXES - Additional Information (Detail) (USD $)
 12 Months Ended 36 Months Ended
Dec. 31, 2015
Dec. 31, 2014
subsidiaries
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2014
Dec. 31, 2010
Income Tax Contingency [Line Items]              
Number of subsidiaries from which corporation is not able to utilize losses   1fbp_NumberOfSubsidiariesFromWhichCorporationIsNotAbleToUtilizeLosses          
Percentage of dividend received deduction from controlled subsidiaries   100.00%fbp_PercentageOfDividendReceivedDeductionFromControlledSubsidiaries          
Percentage of dividend received from other taxable domestic corporations   85.00%fbp_PercentageOfDividendReceivedFromOtherTaxableDomesticCorporations          
Statutory rate   (39.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (30.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Minimum percentage of bank net taxable income for paying Income tax at normal rate   20.00%fbp_MinimumPercentageOfBankNetTaxableIncomeForPayingIncomeTaxAtNormalRate          
Income tax expense   $ (300,649,000)us-gaap_IncomeTaxExpenseBenefit $ 5,164,000us-gaap_IncomeTaxExpenseBenefit $ 5,932,000us-gaap_IncomeTaxExpenseBenefit      
New unrecognized Tax Benefits (UTBs)   0us-gaap_UnrecognizedTaxBenefits 4,310,000us-gaap_UnrecognizedTaxBenefits 2,374,000us-gaap_UnrecognizedTaxBenefits 2,374,000us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 2,374,000us-gaap_UnrecognizedTaxBenefits
Accrued interest related to UTB   1,400,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued       1,400,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued  
Percentage of national gross tax receipt   1.00%fbp_NationalGrossReceiptTaxPercent          
National gross receipt expense   5,700,000fbp_NationalGrossReceiptTaxAmount 5,900,000fbp_NationalGrossReceiptTaxAmount        
Percentage of gross receipt tax credit   0.50%fbp_PercentageIncomeTaxCreditsAndAdjustments          
Gross income credit amount   2,900,000us-gaap_IncomeTaxCreditsAndAdjustments 3,000,000us-gaap_IncomeTaxCreditsAndAdjustments        
Net Deferred Tax Assets Deferred Income   124,600,000fbp_NetDeferredTaxAssetsDeferredIncome       124,600,000fbp_NetDeferredTaxAssetsDeferredIncome  
Cumulative Loss Position Period   3 years 0 months 0 days     3 years 0 months 0 days    
Changes In Statutory Tax Rate Net Benefit     1,300,000fbp_ChangesInStatutoryTaxRateNetBenefit        
Cumulative Effect On Retained Earnings Before Tax 1           (51,800,000)us-gaap_CumulativeEffectOnRetainedEarningsBeforeTax1 (860,300,000)us-gaap_CumulativeEffectOnRetainedEarningsBeforeTax1
Valuation Allowance Deferred Tax Asset Change In Amount   (302,900,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount          
Siginificant Changes In Reserve For Uncertain Tax Positions   3,700,000fbp_SiginificantChangesInReserveForUncertainTaxPositions          
Deferred Tax Assets Current   188,400,000fbp_DeferredTaxAssetsCurrent       188,400,000fbp_DeferredTaxAssetsCurrent  
Defferred Tax Assets Other Net Operating Losses   $ 10,700,000fbp_DefferredTaxAssetsOtherNetOperatingLosses       $ 10,700,000fbp_DefferredTaxAssetsOtherNetOperatingLosses  
Statutory Sales And Use Tax Rate   7.00%fbp_StatutorySalesAndUseTaxRate          
Value Added Tax Rate 16.00%fbp_ValueAddedTaxRate            
P R              
Income Tax Contingency [Line Items]              
Statute of limitations under income tax act   4 years 0 months 0 days          
U S              
Income Tax Contingency [Line Items]              
Statute of limitations under income tax act   3 years 0 months 0 days          
V I              
Income Tax Contingency [Line Items]              
Statute of limitations under income tax act   3 years 0 months 0 days