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Loans and Asset Quality Information (Summary of Balances related to the expired agreement) (Details) $ in Thousands | Sep. 30, 2016 USD ($)
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Bank of Asheville non- single family agreement termination April 1, 2016 [Member] |
Carrying value of total covered loans transferred to non-covered | $ 17,737
Covered nonaccrual loans transferred to non-covered | 2,785
Covered foreclosed real estate transferred to non-covered | 1,165
Allowance for loan losses associated with covered loans transferred to allowance for non-covered loans | 307
Remaining loss share agreement terminations July 1, 2016 [Member] |
Carrying value of total covered loans transferred to non-covered | 78,387
Covered nonaccrual loans transferred to non-covered | 4,194
Covered foreclosed real estate transferred to non-covered | 385
Allowance for loan losses associated with covered loans transferred to allowance for non-covered loans | $ 1,074

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- Definition Allowance for loan losses associated with covered loans transferred to allowance for non-covered loans. + 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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- Definition Carrying value of total covered loans transferred to 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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- Definition Covered foreclosed real estate transferred to non-covered. + References No definition available. + Details
Name: | fbp_CoveredForeclosedRealEstateTransferredToNoncovered
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Covered nonaccrual loans transferred to non-covered. + References No definition available. + Details
Name: | fbp_CoveredNonaccrualLoansTransferredToNoncovered
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fbp_BankOfAshevilleNonSingleFamilyAgreementTerminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fbp_RemainingLossShareAgreementTerminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |