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COMMITMENTS AND CONTINGENCIES (Credit-Related Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Other Commitments [Line Items] |  |
Commitments to extend credit | $ 1,426,416 | $ 1,360,351
Commercial letters of credit | 104 | 1,096
Standby letters of credit and financial guarantees | 29,881 | 25,321
Recourse |  |
Other Commitments [Line Items] |  |
Loans sold with recourse | $ 84,811 | $ 90,464

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- Definition Amount of the contingent obligation under letters of credit. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation. + References No definition available. + Details
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Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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Balance Type: | debit
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |