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Significant Event (Narrative) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Extraordinary And Unusual Items Abstract |  |
Incurred costs due to hurricane |  | $ 2,200,000
Insurance reimbursement | $ 700 | 1,000,000
Other assets receivable from insurance | $ 500 | 1,200,000
Estimated total losses |  | $ 6,600,000

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- Definition Total estimated total losses + References No definition available. + Details
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- Definition Recovery from incurred costs + References No definition available. + Details
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- Definition Partial payment from insurance companies + 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 Receivable placed in other assets from the insurance companies + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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