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Accrued Interest and Other Assets (Narratives) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 18, 2012
Other assets [Line Items]      
Prepaid Taxes $ 9,600,000us-gaap_PrepaidTaxes $ 8,600,000us-gaap_PrepaidTaxes  
Mortgage tax credits 6,277,000us-gaap_TaxCreditCarryforwardAmount 8,706,000us-gaap_TaxCreditCarryforwardAmount  
Repossessed auto 20,700,000ofg_RepossessedAuto 12,300,000ofg_RepossessedAuto  
CoreDepositsMember | Eurobank [Member]      
Other assets [Line Items]      
Other Intangible Assets 6,500,000ofg_OtherIntangibleAssets
/ ofg_AssetsAcquiredByCompanyAcquireeAxis
= ofg_EurobankMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
7,800,000ofg_OtherIntangibleAssets
/ ofg_AssetsAcquiredByCompanyAcquireeAxis
= ofg_EurobankMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
 
Customer Relationships [Member] | BBVAPR      
Other assets [Line Items]      
Other Intangible Assets $ 3,300,000ofg_OtherIntangibleAssets
/ ofg_AssetsAcquiredByCompanyAcquireeAxis
= ofg_MostRecentBusinessAcquiredNameMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
$ 4,100,000ofg_OtherIntangibleAssets
/ ofg_AssetsAcquiredByCompanyAcquireeAxis
= ofg_MostRecentBusinessAcquiredNameMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
$ 5,000,000ofg_OtherIntangibleAssets
/ ofg_AssetsAcquiredByCompanyAcquireeAxis
= ofg_MostRecentBusinessAcquiredNameMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember