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DEPOSITS - Narratives (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Deposits [Line Items] |  |
Unamortized broker placement fees | $ 0.4 | $ 0.3
Time deposits in denominations of $250,000 or more | $ 1,100.0 | $ 1,000.0

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- Definition Deposits [Line Items] + References No definition available. + Details
Name: | fbp_DepositsLineItems
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition unamortized amount of costs for brokerage fees paid for issuance of brokered CDs. + References No definition available. + Details
Name: | fbp_UnamortizedBrokerPlacementFees
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
Name: | us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant