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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Purchased impaired loans |  |
Balance, beginning, carrying value | $ 514 | $ 1,970
Change due to payments received | (126) | (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 | 85 |
Other | 7 |
Balance, ending, carrying value |  | 514
Balance, Ending | 19,665 |
Accretable Yield [Member] |  |
Purchased 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 | (85) |
Other |  |
Balance, Ending | $ 3,532 |

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
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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
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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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
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Namespace Prefix: |
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Balance Type: |
Period Type: |