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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Securities purchased and sold under agreements to repurchase (Detail) | 12 Months Ended
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Dec. 31, 2022
NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |
Modified Repurchase Agreements Threshold | 10.00%

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- Definition The percentage difference between the cash flows under the terms of the modified repurchase agreement and the present value of the remaining cash flows under the terms of the original instrument. + References No definition available. + Details
Name: | fbp_ModifiedRepurchaseAgreementsThreshold
Namespace Prefix: | fbp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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