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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) [Abstract]
Over one to five years	$ 500,000
Total	$ 500,000	$ 675,000

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- Definition

Federal Home Loan Bank Advances Maturities Due One To Five Years

+ References

No definition available.

+ Details

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Namespace Prefix:	fbp_
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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration