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Allowance for Loan and Lease Losses (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans And Leases Receivable Allowance, Covered | $ 12,300,000 |  | $ 12,300,000 |  | $ 22,600,000
Provision (recapture) for Loan Losses, Covered | (893,000) | $ (15,800,000) | 1,100,000 | $ 20,500,000 |
Allowance de-recognition due to change in policy from most recent acquisition |  |  | 8,900,000 |  |
Allowance de-recognition due to change in policy from loans acquired acquisition |  |  | 73,100,000 |  |
PREPA Line of Credit Sold Charge-off | 56,200,000 |  | 56,200,000 |  |
PREPA Line of Credit Sold Provision | $ 2,900,000 |  | $ 2,900,000 |  |

X
- Definition The Company changed the purchase credit impaired policy for all loans accounted for under ASC 310-30. Under the new policy, the Company writes-off the loans recorded investment and derecognizes the associated allowance for loan and lease losses for acquired loans that exit the pools. + References No definition available. + Details
Name: | ofg_AllowanceDeRecognitionDueToChangeInPolicyFromLoansAcquiredAcquisition
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The Company changed the purchase credit impaired policy for all loans accounted for under ASC 310-30. Under the new policy, the Company writes-off the loans recorded investment and derecognizes the associated allowance for loan and lease losses for most recent acquired loans that exit the pools. + References No definition available. + Details
Name: | ofg_AllowanceDeRecognitionDueToChangeInPolicyFromMostRecentAcquisition
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Government public corporation line of credit sold charge-off + References No definition available. + Details
Name: | ofg_GovernmentLineOfCreditSoldChargeOff
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Government public corporation line of credit sold provision + References No definition available. + Details
Name: | ofg_GovernmentLineOfCreditSoldProvision
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of loan loss provisions (recapture) 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 + References No definition available. + Details
Name: | ofg_ProvisionForLoanLossesCovered
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for loan and lease losses covered by loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowanceCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant