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Commitments and Contingencies (Narratives) (Details) - USD ($) $ in Millions | Jan. 01, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Commitments and Contingencies [Abstract] |  |  |
Increase (Decrease) In Off-Balance Sheet Allowance | $ 0.2 |  |
Allowance For Credit Losses For Off-Balance Sheet |  | $ 2.4 | $ 3.7

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- Definition Allowance For Credit Losses For Off-Balance Sheet + References No definition available. + Details
Name: | ofg_AllowanceForCreditLossesForOffBalanceSheet
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase (Decrease) In Off-Balance Sheet Allowance + References No definition available. + Details
Name: | ofg_IncreaseDecreaseInOffBalanceSheetAllowance
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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