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Loans (Troubled debt restructurings, Rolling Twelve Months) (Details)	12 Months Ended
	Mar. 31, 2019 USD ($) number	Mar. 31, 2018 USD ($) number
Mortgage Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	27	36
Recored Investment | $	$ 3,011,000	$ 3,310,000
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	4	4
Recored Investment | $	$ 1,981,000	$ 398,000
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	43	23
Recored Investment | $	$ 587,000	$ 243,000

X

- Definition

[2012] Number of financing receivables that have been modified by troubled debt restructurings for the past twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	ofg_
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Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

+ Details

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Period Type:	instant

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- Details

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Namespace Prefix:
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- Details

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- Details

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