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Borrowings and Related Interest (Repurchased Agreements Other Significant Data) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Repurchase Agreements [Abstract] |  |  |
Average Daily Aggregate Balance Outstanding | $ 299,842 | $ 357,086 | $ 393,133
Maximum Outstanding Balance At Any Month End | $ 461,954 | $ 457,053 | $ 606,210
Weighted average interest rate during the year | 2.48% | 2.17% | 1.80%
Weighted average interest rate at year end | 2.45% | 2.49% | 1.63%

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- Definition Average daily aggregate balance outstanding of repurchase agreements and other debts instruments + References No definition available. + Details
Name: | ofg_AverageDailyAggregateBalanceOutstanding
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum outstanding balance at any month-end of repurcase agreements and other debt instruments. + References No definition available. + Details
Name: | ofg_MaximumOutstandingBalanceAtAnyMonthEnd
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repurchase agreement weighted average interest rate at year end + References No definition available. + Details
Name: | ofg_RepurchaseAgreementWeightedAverageInterestRateAtYearEnd
Namespace Prefix: | ofg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Weighted average interest rate during the year + References No definition available. + Details
Name: | ofg_RepurchaseAgreementWeightedAverageInterestRateDuringYear
Namespace Prefix: | ofg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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