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Borrowings and Related Interest (Repurchased Agreements Other Significant Data) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Repurchase Agreements [Abstract] |  |  |
Average Daily Aggregate Balance Outstanding | $ 357,086 | $ 393,133 | $ 663,845
Maximum Outstanding Balance At Any Month End | $ 457,053 | $ 606,210 | $ 902,500
Repurchase agreement weighted average interest rate during the year | 2.17% | 1.80% | 2.83%
Weighted average interest rate at year end | 2.49% | 1.63% | 2.47%

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- Definition Average daily aggregate balance outstanding of repurchase agreements and other debts instruments + 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 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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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