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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
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, carrying value $ 2,597fbp_ImpairedPurchasedLoansCarryingValue $ 3,142fbp_ImpairedPurchasedLoansCarryingValue
Change due to payments received (104)fbp_ChangeDueToPaymentsReceived (826)fbp_ChangeDueToPaymentsReceived
Change due to loan charge-off   (31)fbp_ChangeDueToLoanChargeoff
Other    312fbp_Other
Balance, ending, carrying value 2,493fbp_ImpairedPurchasedLoansCarryingValue 2,597fbp_ImpairedPurchasedLoansCarryingValue
Contractual Principal Receivable [Member]    
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, contractual principal 5,859fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 6,263fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Change due to payments received (42)fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 (599)fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Change due to loan charge-off   (2)fbp_ChangeDueToLoanChargeoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Other (3)fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 197fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember
Balance, ending, contractual principal 5,814fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ContractualPrincipalMember		 5,859fbp_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 3,262fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 3,121fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Change due to payments received 62fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 227fbp_ChangeDueToPaymentsReceived
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Change due to loan charge-off   29fbp_ChangeDueToLoanChargeoff
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Other (3)fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 (115)fbp_Other
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember
Balance, ending, FMV $ 3,321fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember		 $ 3,262fbp_FairValueAdjustmentWriteDown
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_FairValueMember