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CASH RESTRICTIONS (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Restricted Cash and Investments [Abstract] |  |
Reserve required by local government | $ 467.4 | $ 472.0

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- Definition Cash deposited in a special reserve account for the exclusive benefit of government demand deposits pursuant to local Government Regulations + References No definition available. + Details
Name: | ofg_ReserveRequiredByLocalGoverment
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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