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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for loan and lease losses (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items] |
Minimum balance of uncollectible loans to be written down | $ 0.5
PR And VI [Member] |
Financing Receivable Allowance For Credit Losses [Line Items] |
Forecast Period | P2Y
PR And VI [Member] | Maximum [Member] |
Financing Receivable Allowance For Credit Losses [Line Items] |
Reversion Period | P3Y

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- Definition Forecast period considered in the determination of the allowance for credit losses in connection with the adoption of current expected credit loss standard (CECL). + References No definition available. + Details
Name: | fbp_ForecastPeriod
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum Balance Of Uncollectible Loans To Be Written Down + References No definition available. + Details
Name: | fbp_MinimumBalanceOfUncollectibleLoansToBeWrittenDown
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reversion period considered in the determination of the allowance credit losses (ACL) in connection with the adoption of current expected credit loss standard (CECL). + References No definition available. + Details
Name: | fbp_Reversionperiod
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=fbp_PRAndVIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |