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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, carrying value $ 3,142fbp_ImpairedPurchasedLoansCarryingValue $ 4,825fbp_ImpairedPurchasedLoansCarryingValue
Change due to payments received (826)fbp_ChangeDueToPaymentsReceived (270)fbp_ChangeDueToPaymentsReceived
Transfer to foreclosed real estate   (1,316)fbp_TransferToForeclosedRealEstate
Change due to loan charge-off (31)fbp_ChangeDueToLoanChargeoff (96)fbp_ChangeDueToLoanChargeoff
Other 312fbp_Other (1)fbp_Other
Balance, ending, carrying value 2,597fbp_ImpairedPurchasedLoansCarryingValue 3,142fbp_ImpairedPurchasedLoansCarryingValue
Contractual Principal Receivable [Member]    
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, contractual principal 6,263fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 8,815fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Change due to payments received (599)fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 (301)fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Transfer to foreclosed real estate   (2,100)fbp_TransferToForeclosedRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Change due to loan charge-off (2)fbp_ChangeDueToLoanChargeoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 (150)fbp_ChangeDueToLoanChargeoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Other 197fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 (1)fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Balance, ending, contractual principal 5,859fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 6,263fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Fair Value Adjustment Write Down [Member]    
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, FMV 3,121fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 3,990fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Change due to payments received 227fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 (31)fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Transfer to foreclosed real estate   (784)fbp_TransferToForeclosedRealEstate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Change due to loan charge-off 29fbp_ChangeDueToLoanChargeoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 (54)fbp_ChangeDueToLoanChargeoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Other (115)fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		   
Balance, ending, FMV $ 3,262fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 $ 3,121fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember