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Stockholders' Equity (Shares repurchased under the stock repurchase program) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value	$ 97,070us-gaap_TreasuryStockValue	$ 80,642us-gaap_TreasuryStockValue
January 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	57,700us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_January2014Member
Treasury Stock Acquired, Average Cost Per Share	$ 14.73us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_January2014Member
Treasury Stock, Value	850us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_January2014Member
February 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	649,700us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_February2014Member
Treasury Stock Acquired, Average Cost Per Share	$ 14.66us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_February2014Member
Treasury Stock, Value	9,522us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_February2014Member
August 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	100us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_August2014Member
Treasury Stock Acquired, Average Cost Per Share	$ 15.50us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_August2014Member
Treasury Stock, Value	2us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_August2014Member
October 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	381,513us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_October2014Member
Treasury Stock Acquired, Average Cost Per Share	$ 14.64us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_October2014Member
Treasury Stock, Value	5,585us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_October2014Member
November 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	63,100us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_November2014Member
Treasury Stock Acquired, Average Cost Per Share	$ 14.69us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_November2014Member
Treasury Stock, Value	927us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_November2014Member
December 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	1,885us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_December2014Member
Treasury Stock Acquired, Average Cost Per Share	$ 14.70us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_December2014Member
Treasury Stock, Value	28us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_December2014Member
Seventy Millions Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased as part of the stock repurchase program (Shares)	1,153,998us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = ofg_SeventymillionsrepurchaseprogramMember
Treasury Stock Acquired, Average Cost Per Share	$ 14.66us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = ofg_SeventymillionsrepurchaseprogramMember
Treasury Stock, Value	$ 16,914us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = ofg_SeventymillionsrepurchaseprogramMember

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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