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Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Group [Member]
Capital [Abstract]
Actual - Total capital	$ 851,437us-gaap_Capital / dei_LegalEntityAxis = ofg_GroupMember	$ 827,459us-gaap_Capital / dei_LegalEntityAxis = ofg_GroupMember
Actual - Tier 1 capital	776,525us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = ofg_GroupMember	736,106us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = ofg_GroupMember
Actual - Tier 1 leverage capital	776,525us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = ofg_GroupMember	736,106us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = ofg_GroupMember
Minimum Capital - Total Capital	387,772us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_GroupMember	409,514us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_GroupMember
Minimum capital - Tier 1 capital	193,886us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_GroupMember	204,757us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_GroupMember
Minimum capital - Tier 1 leverage capital	292,738us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_GroupMember	324,910us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_GroupMember
Minimum to be well capitalized - Total Capital	484,715us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_GroupMember	511,893us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_GroupMember
Minimum to be well capitalized - Tier 1 capital	290,829us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_GroupMember	307,136us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_GroupMember
Minimum to be well capitalized - Tier 1 leverage	365,922us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_GroupMember	406,138us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_GroupMember
Risk Based Ratios [Abstract]
Capital to Risk Weighted Assets	17.57%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember	16.16%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember
Tier One Risk Based Capital to Risk Weighted Assets	16.02%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember	14.38%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember
Tier One Leverage Capital to Average Assets	10.61%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = ofg_GroupMember	9.06%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = ofg_GroupMember
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = ofg_GroupMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = ofg_GroupMember
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_GroupMember
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = ofg_GroupMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = ofg_GroupMember
Bank [Member]
Capital [Abstract]
Actual - Total capital	820,884us-gaap_Capital / dei_LegalEntityAxis = ofg_BankMember	779,414us-gaap_Capital / dei_LegalEntityAxis = ofg_BankMember
Actual - Tier 1 capital	746,177us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = ofg_BankMember	688,349us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = ofg_BankMember
Actual - Tier 1 leverage capital	746,177us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = ofg_BankMember	688,349us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = ofg_BankMember
Minimum Capital - Total Capital	386,444us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_BankMember	407,637us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_BankMember
Minimum capital - Tier 1 capital	193,222us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_BankMember	203,819us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_BankMember
Minimum capital - Tier 1 leverage capital	290,879us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_BankMember	322,395us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = ofg_BankMember
Minimum to be well capitalized - Total Capital	483,055us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_BankMember	509,547us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_BankMember
Minimum to be well capitalized - Tier 1 capital	289,833us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_BankMember	305,728us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_BankMember
Minimum to be well capitalized - Tier 1 leverage	$ 363,599us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_BankMember	$ 402,993us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = ofg_BankMember
Risk Based Ratios [Abstract]
Capital to Risk Weighted Assets	16.99%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember	15.30%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember
Tier One Risk Based Capital to Risk Weighted Assets	15.45%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember	13.51%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember
Tier One Leverage Capital to Average Assets	10.26%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = ofg_BankMember	8.54%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = ofg_BankMember
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = ofg_BankMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = ofg_BankMember
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = ofg_BankMember
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = ofg_BankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = ofg_BankMember

X

- Definition

The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Tier 1 Risk Based Capital as defined in the regulations.

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- Definition

The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826

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X

- Definition

Tier 1 capital divided by risk weighted assets as defined by regulations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826



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-Name Accounting Standards Codification

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-Section 50

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