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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) [Abstract] |  |
Within one month | $ 425,000 |
Over one to five years | 500,000 |
Total | $ 925,000 | $ 675,000

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- Definition Federal Home Loan Bank Advances Maturities Due One To Five Years + References No definition available. + Details
Name: | fbp_FederalHomeLoanBankAdvancesMaturitiesDueOneToFiveYears
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank (FHLB), which are primarily used to cover shortages in the required reserve balance and liquidity shortages. The maturity period of these FHLB is withing one month of the reporting period. + References No definition available. + Details
Name: | fbp_FederalHomeLoanBankAdvancesMaturitiesDueWithinOneMonth
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with fixed interest rate. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesFixedRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesFixedRateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration