OFG Bancorp (Holding Company Only) Financial Information (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Oriental Insurance [Member]
Subsidiary Or Equity Method Investee [Line Items]
Dividends And Interest Paid	$ 4,000,000	$ 4,000,000	$ 5,000,000
Oriental Financial Services [Member]
Subsidiary Or Equity Method Investee [Line Items]
Dividends And Interest Paid	$ 0	$ 0	$ 1,000,000

The contractual amount of dividends (or interest on participating income bonds) that must be paid for the current period (for example, unpaid cumulative dividends).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2740-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60A
-URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780132-109256

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 66
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2814-109256

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration