Commitments (Summarized credit-related financial instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Commitments and Contingencies [Abstract]
Commitments To Extend Credit	$ 498,249	$ 456,720
Commercial letters credit	2,619	1,508
Standby letters of credit and financial guarantees	4,656	14,656
Loans sold with recourse	21,957	22,374
Commitments To Sell Or Securitize Mortgage Loans	$ 11,886	$ 34,888

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

No definition available.

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