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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Purchased Credit Impaired Loans |  |
Balance, beginning, carrying value | $ 514 | $ 1,970
Change due to payments received | (5,585) | (1,386)
Change due to loan charge-off |  | (70)
Transfer to foreclosed real estate | (69) |
Additions due to acquisition of Carolina Bank | 19,254 |
Accretion | 1,326 |
Other | (406) |
Balance, ending, carrying value | 15,034 | 514
Accretable Yield [Member] |  |
Purchased Credit Impaired Loans |  |
Balance, beginning, Acrretable Yield |  |
Change due to payments received |  |
Transfer to foreclosed real estate |  |
Additions due to acquisition of Carolina Bank | 3,617 |
Accretion | (1,326) |
Other |  |
Balance, Ending | $ 2,291 |

X
- Definition The amount of accretion expense (credit). + References No definition available. + Details
Name: | fbp_AccretionExpenseCredit
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Additions due to acquisition of The Bank of Asheville + References No definition available. + Details
Name: | fbp_AdditionsDueToAcquisitionOfBankOfCarolinaAtFairValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Balance, beginning, Acrretable Yield + References No definition available. + Details
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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

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- 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

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- References No definition available. + Details
Name: | fbp_PurchasedImpairedLoansSubstantiallyAllOfWhichAreCoveredLoansAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |