Commitments (Summarized credit-related financial instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies [Abstract]
Commitments To Extend Credit	$ 493,248ofg_CommitmentsToExtendCredit	$ 520,269ofg_CommitmentsToExtendCredit
Commercial letters credit	885ofg_CommercialLettersCredit	1,096ofg_CommercialLettersCredit
Standby letters of credit and financial guarantees	32,970	38,577
Loans sold with recourse	67,803ofg_LoansSoldWithRecourse	122,291ofg_LoansSoldWithRecourse
Commitments To Sell Or Securitize Mortgage Loans	$ 10,207	$ 80,307

Amount of the contingent obligation under letters of credit.

No definition available.

Name:	ofg_CommercialLettersCredit
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Loan commitments are legally binding commitments to extend credit to a counterparty under certain terms and conditions.

No definition available.

Name:	ofg_CommitmentsToExtendCredit
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the remaining balance on commitments to sell or securitize mortgage loans.

No definition available.

Name:	ofg_CommitmentsToSellOrSecuritizeMortgageLoans
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments to borrowers or third party investors for the origination of a loan.

No definition available.

An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation.

No definition available.

Name:	ofg_StandbyLettersOfCreditAndFinancialGuarantees
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration