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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) $ in Thousands	Jun. 30, 2022 USD ($)
Federal Home Loan Bank, Advances, Fixed Rate [Abstract]
Over one to three months	$ 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 six one to three months of the reporting period.

+ References

No definition available.

+ Details

Name:	fbp_FederalHomeLoanBankAdvancesMaturitiesDueOneToThreeMonths
Namespace Prefix:	fbp_
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