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DEPOSITS - Summary of Deposits Balance (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Interest Bearing Deposit [Member] | Minimum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 0.05% | 0.05%
Interest Bearing Deposit [Member] | Maximum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 1.00% | 1.00%
Savings Deposits [Member] | Minimum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 0.05% | 0.05%
Savings Deposits [Member] | Maximum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 0.40% | 0.40%
Certificate Of Deposits [Member] | Minimum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 0.10% | 0.10%
Certificate Of Deposits [Member] | Maximum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 4.00% | 4.00%
Brokered Certificate of Deposits [Member] | Minimum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 0.85% | 0.60%
Brokered Certificate of Deposits [Member] | Maximum [Member] |  |
Deposits [Line Items] |  |
Deposits Stated Interest Rate | 2.80% | 2.80%

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- Definition Deposits [Line Items] + References No definition available. + Details
Name: | fbp_DepositsLineItems
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate paid on deposit accounts + References No definition available. + Details
Name: | fbp_DepositsStatedInterestRate
Namespace Prefix: | fbp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | fbp_DeposistByTypeAxis=fbp_InterestBearingDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fbp_DeposistByTypeAxis=fbp_SavingsDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fbp_DeposistByTypeAxis=fbp_CertificateOfDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fbp_DeposistByTypeAxis=fbp_BrokeredCertificateOfDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |