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FDIC Shared-Loss Agreements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Banking and Financial Service Reveues [Abstract]
FDIC indemnification asset, benefit	$ 0	$ 0	$ (1,403)
(Repayment to reimbursement to the FDIC for the termination of shared-loss agreements			$ 10,100

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- Definition

Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC), excluding the clawback provision.

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No definition available.

+ Details

Name:	ofg_FdicIndemnificationAssetExpense
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Payment made for the disolution of the FDIC shared-loss agreement.

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No definition available.

+ Details

Name:	ofg_RepaymentToTheFdicForTheTerminationOfSharedLossAgreements
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_BankingAndThriftAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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