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Borrowings (Other Significant Details) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
DisclosureOfRepurchaseAgreementsAbstract    
Average Daily Aggregate Balance Outstanding $ 1,041,378ofg_AverageDailyAggregateBalanceOutstanding $ 1,353,011ofg_AverageDailyAggregateBalanceOutstanding
Maximum Outstanding Balance At Any Month End $ 1,149,167ofg_MaximumOutstandingBalanceAtAnyMonthEnd $ 1,552,269ofg_MaximumOutstandingBalanceAtAnyMonthEnd
Repurchase agreement weighted average interest rate during the year 2.85%ofg_RepurchaseAgreementWeightedAverageInterestRateDuringYear 2.16%ofg_RepurchaseAgreementWeightedAverageInterestRateDuringYear
Weighted average interest rate at year end 2.95%ofg_RepurchaseAgreementWeightedAverageInterestRateAtYearEnd 2.41%ofg_RepurchaseAgreementWeightedAverageInterestRateAtYearEnd