Allowance for Loan and Lease Losses (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans And Leases Receivable Allowance, Covered	$ 32.7	$ 32.7
Provision for Loan Losses, Covered	$ 15.8	$ 18.1

Amount of loan loss provisions charged to earnings from the date of the transfer of the loan for loans not accounted for as debt securities and acquired in an FDIC acquision transaction of coverage, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable

No definition available.

Name:	ofg_ProvisionForLoanLossesCovered
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration