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FDIC Shared-Loss Agreements (FDIC Indemnification Expense) (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)
Change in true-up payment obligation expense	0	0	0
Reimbursement to FDIC for recoveries	0	0	0
Total FDIC shared-loss benefit	$ 0	$ 0	$ (1,403)

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- Definition

Increases of the clawback liability due to a decline ain expected losses of loans under sharing agreements.

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No definition available.

+ Details

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

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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

FDIC shared-loss expense, net

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No definition available.

+ Details

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

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- Definition

Recoveries shared with the FDIC per the loss sharing agreement.

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No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_BankingAndThriftAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration