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OTHER BORROWINGS - Components of Other Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Junior subordinated debentures due in 2034 $ 231,959us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust $ 231,959us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Junior Subordinated Debentures Bearing Interest At Floating Rate Of Two Point Seventy Five [Member]    
Debt Instrument [Line Items]    
Junior subordinated debentures due in 2034 103,093us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_DebtInstrumentAxis
= fbp_JuniorSubordinatedDebenturesBearingInterestAtFloatingRateOfTwoPointSeventyFiveMember		 103,093us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_DebtInstrumentAxis
= fbp_JuniorSubordinatedDebenturesBearingInterestAtFloatingRateOfTwoPointSeventyFiveMember
Junior Subordinated Debentures Bearing Interest At Floating Rate Of Two Point Fifty Percent [Member]    
Debt Instrument [Line Items]    
Junior subordinated debentures due in 2034 $ 128,866us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_DebtInstrumentAxis
= fbp_JuniorSubordinatedDebenturesBearingInterestAtFloatingRateOfTwoPointFiftyPercentMember		 $ 128,866us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_DebtInstrumentAxis
= fbp_JuniorSubordinatedDebenturesBearingInterestAtFloatingRateOfTwoPointFiftyPercentMember