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BORROWINGS - Securities Sold Under Agreements to Repurchase (Repurchase Agreements) - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
BORROWINGS [Abstract] |  |
Maximum aggregate balance of repurchase agreements outstanding | $ 0 | $ 173,000,000.0
Average balance outstanding | $ 200,000 | $ 54,600,000

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- Definition Maximum aggregate amount outstanding of securities sold under agreements to repurchase. + References No definition available. + Details
Name: | fbp_SecuritiesSoldUnderAgreementsToRepurchaseMaximumAggregateAmountOutstanding
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

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- Definition Average amount outstanding of securities sold under agreements to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph a -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph b -Subparagraph (1) -Publisher SEC + Details
Name: | us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration