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Loans and Asset Quality Information (Summary of Balances related to the expired agreement) (Details) - USD ($) $ in Thousands | Sep. 22, 2016 | Apr. 01, 2016 | Jul. 01, 2014
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Cooperative Bank non-single family agreement termination July 1, 2014 [Member] |  |  |
Carrying value of total covered loans transferred to non-covered |  |  | $ 39,700
Covered nonaccrual loans transferred to non-covered |  |  | 9,700
Covered foreclosed real estate transferred to non-covered |  |  | 3,000
Allowance for loan losses associated with covered loans transferred to allowance for non-covered loans |  |  | $ 1,700
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 September 22, 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
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- Definition Covered foreclosed real estate transferred to non-covered. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Covered nonaccrual loans transferred to non-covered. + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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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: |