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DEPOSITS - Narratives (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Deposits [Line Items] |  |
Time deposits in denominations of $250,000 or more | $ 1,800.0 | $ 1,500.0
Unamortized broker placement fees | $ 1.0 | $ 1.1

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- Definition Deposits [Line Items] + References No definition available. + Details
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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 + Details
Name: | us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant