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Consolidated Statements of Financial Condition (Audited) (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Amortized cost of trading securities $ 2,419,000ofg_AmortizedCostOfTradingSecurities $ 2,448,000ofg_AmortizedCostOfTradingSecurities
Amortized cost of investment securities available-for-sale 1,187,679,000us-gaap_AvailableForSaleSecuritiesAmortizedCost 1,575,043,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair value of held to maturity securities 164,154,000us-gaap_HeldToMaturitySecuritiesFairValue 0us-gaap_HeldToMaturitySecuritiesFairValue
Allowance for loan and lease losses, non-covered 69,517,000us-gaap_LoansAndLeasesReceivableAllowance 54,298,000us-gaap_LoansAndLeasesReceivableAllowance
Allowance for loan and lease losses, covered 64,245,000us-gaap_LoansAndLeasesReceivableAllowanceCovered 52,729,000us-gaap_LoansAndLeasesReceivableAllowanceCovered
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, liquidation value 25us-gaap_PreferredStockLiquidationPreferenceValue 25us-gaap_PreferredStockLiquidationPreferenceValue
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 52,625,869us-gaap_CommonStockSharesIssued 52,707,023us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 44,613,615us-gaap_CommonStockSharesOutstanding 45,676,922us-gaap_CommonStockSharesOutstanding
Treasury stock, at cost, shares 8,012,254us-gaap_TreasuryStockShares 7,030,101us-gaap_TreasuryStockShares
Tax effect on accumulated other comprehensive income (loss) 447,000us-gaap_OtherComprehensiveIncomeLossTax (831,000)us-gaap_OtherComprehensiveIncomeLossTax
Series A Preferred Stock    
Preferred stock, shares outstanding 1,340,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 1,340,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock    
Preferred stock, shares outstanding 1,380,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 1,380,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series C Convertible Preferred Stock    
Preferred stock, shares outstanding 84,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonredeemableConvertiblePreferredStockMember		 84,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonredeemableConvertiblePreferredStockMember
Preferred stock, liquidation value $ 1,000us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonredeemableConvertiblePreferredStockMember		 $ 1,000us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonredeemableConvertiblePreferredStockMember
Series D Preferred Stock Member    
Preferred stock, shares outstanding 960,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 960,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember