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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Financial Information [Line Items] |  |
Commercian Loans Collaterized By Real Estate | $ 802.7 | $ 833.5

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- Definition Commercial loans secured by real estate (owner-occupied commercial loans secured by real estate) but are not dependent upon real estate for repayment. + References No definition available. + Details
Name: | fbp_CommercianLoansCollaterizedByRealEstate
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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