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LOAN PORTFOLIO -Changes in Carrying Amount Of Purchased Credit Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable Impaired [Line Items]    
Beggining balance: purchased credit-impaired loans $ 4,791us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet  
Purchased Credit Impaired Loans Aquired 102,831fbp_PurchasedCreditImpairedLoansAquired [1]  
Accretion recognized in earnings 4,299us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion 819us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
Ending balance: purchased credit-impaired loans 102,604us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet 4,791us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
Purchased Credit Impaired Loans [Member]    
Financing Receivable Impaired [Line Items]    
Beggining balance: purchased credit-impaired loans 4,791us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesMember		 [2]  
Accretion recognized in earnings 4,299us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesMember		  
Purchased Credit Impaired Loans Principal Collections (9,317)fbp_PurchasedCreditImpairedLoansPrincipalCollections
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesMember		  
Ending balance: purchased credit-impaired loans $ 102,604us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesMember		  
[1] Represents the estimated fair value of the PCI loans acquired from Doral at the date of acquisition.
[2] For the year ended December 31, 2014, the beginning balance relates to PCI loans acquired as part of the credit card portfolio purchased in the second quarter of 2012.