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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 | $ 3,142 fbp_ImpairedPurchasedLoansCarryingValue | $ 4,825 fbp_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 | 312 fbp_Other | (1)fbp_Other
Balance, ending, carrying value | 2,597 fbp_ImpairedPurchasedLoansCarryingValue | 3,142 fbp_ImpairedPurchasedLoansCarryingValue
Contractual Principal Receivable [Member] |  |
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, contractual principal | 6,263 fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_ContractualPrincipalMember | 8,815 fbp_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 | 197 fbp_Other / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_ContractualPrincipalMember | (1)fbp_Other / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_ContractualPrincipalMember
Balance, ending, contractual principal | 5,859 fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_ContractualPrincipalMember | 6,263 fbp_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 | 3,121 fbp_FairValueAdjustmentWriteDown / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_FairValueMember | 3,990 fbp_FairValueAdjustmentWriteDown / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_FairValueMember
Change due to payments received | 227 fbp_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 | 29 fbp_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 | $ 3,262 fbp_FairValueAdjustmentWriteDown / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_FairValueMember | $ 3,121 fbp_FairValueAdjustmentWriteDown / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_FairValueMember

X
- Definition Amount of change due to a loan write-off of the allowance for loans. + References No definition available. + Details
Name: | fbp_ChangeDueToLoanChargeoff
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease in amounts due to payments received. + References No definition available. + Details
Name: | fbp_ChangeDueToPaymentsReceived
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of fair value adjustment write down (nonaccretabe difference) of contractual principal receiavble. + References No definition available. + Details
Name: | fbp_FairValueAdjustmentWriteDown
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value of impaired purchased loans (includes covered and non-covered). + References No definition available. + Details
Name: | fbp_ImpairedPurchasedLoansCarryingValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired purchased loans with related allowance for credit losses and without related allowance for credit losses. + References No definition available. + Details
Name: | fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other activity in amounts not disclosed elsewhere in taxonomy. + References No definition available. + Details
Name: | fbp_Other
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | fbp_PurchasedImpairedLoansSubstantiallyAllOfWhichAreCoveredLoansAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of loans transfered to foreclosed assets. + References No definition available. + Details
Name: | fbp_TransferToForeclosedRealEstate
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fbp_ContractualPrincipalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fbp_FairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |