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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) $ in Thousands	Mar. 31, 2022 USD ($)
Federal Home Loan Bank, Advances, Fixed Rate [Abstract]
Over three to six months	$ 200,000

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- Definition

Federal Home Loan Bank Advances Maturities Due Three Months To Six Months

+ References

No definition available.

+ Details

Name:	fbp_FederalHomeLoanBankAdvancesMaturitiesDueThreeMonthsToSixMonths
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