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BORROWINGS - Advances from FHLB Mature (Details) $ in Thousands | Mar. 31, 2025 USD ($)
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BORROWINGS [Abstract] |
Over three months to six months | $ 30,000
Over six months to one year | 90,000
Over two years to three years | $ 200,000

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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 more than two years up to three years of the reporting period. + References No definition available. + Details
Name: | fbp_FederalHomeLoanBankAdvancesMaturitiesDueAfterTwoYearsToThreeYears
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 more than six months up to one year of the reporting period. + References No definition available. + Details
Name: | fbp_FederalHomeLoanBankAdvancesMaturitiesDueSixMonthsToOneYear
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 over three months to six months of the reporting period. + References No definition available. + Details
Name: | fbp_FederalHomeLoanBankAdvancesMaturitiesDueThreeMonthsToSixMonths
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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