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Commitments and Contingencies (Narratives) (Details) - USD ($) $ in Millions	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies [Abstract]
Increase (Decrease) In Off-Balance Sheet Allowance	$ 0.2
Allowance For Credit Losses For Off-Balance Sheet		$ 1.1	$ 2.7
Contingency loss accrued liability		$ 8.1	$ 6.8

X

- Definition

Allowance For Credit Losses For Off-Balance Sheet

+ References

No definition available.

+ Details

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Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Increase (Decrease) In Off-Balance Sheet Allowance

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant