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FDIC Indemnification Asset and True-up Payment Obligation (FDIC Indemnification Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fdic Shared Loss Expense [Abstract] |  |  |  |
FDIC indemnification asset, expense | $ 0 | $ (1,910) | $ (1,403) | $ 6,179
Change in true-up payment obligation expense | 0 | (508) | 0 | (1,621)
Reimbursement to FDIC for recoveries | 0 | (878) | 0 | (2,945)
FDIC shared-loss expense, net | $ 0 | $ (3,296) | $ 1,403 | $ (10,745)

X
- Definition Increases of the clawback liability due to a decline ain expected losses of loans under sharing agreements. + References No definition available. + Details
Name: | ofg_FdicClawbackLiability
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC), excluding the clawback provision. + References No definition available. + Details
Name: | ofg_FdicIndemnificationAssetExpense
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition FDIC shared-loss expense, net + References No definition available. + Details
Name: | ofg_FdicSharedLossExpenseNet
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ofg_Fdicsharedlossexpenseabstract
Namespace Prefix: | ofg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recoveries shared with the FDIC per the loss sharing agreement. + References No definition available. + Details
Name: | ofg_Reimbursementtofdicforrecoveries
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration