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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 544 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 4,402 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 1,222 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 3,653 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Total Realized and Unrealized Gains (Losses) | 678 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome | (749)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome |  |
Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 9,508 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | 5,946 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember |  |
Total Realized and Unrealized Gains (Losses) | (231)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | (169)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember |  |
Purchases and Issuances | 198 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | 4,052 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember |  |
Sales and Settlements | (215)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | (503)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember |  |
Transfers In (Out) | (111)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | (620)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember |  |
Ending Balance | 9,149 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | 8,706 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember |  |
Interest Rate Lock Commitments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 7,576 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 2,375 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |  |
Total Realized and Unrealized Gains (Losses) | 3,848 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 663 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |  |
Ending Balance | 11,424 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 3,038 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |  |
Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 91,422 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 85,124 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |
Total Realized and Unrealized Gains (Losses) | 935 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 1 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |
Purchases and Issuances | 8,225 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 3,200 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |
Sales and Settlements | (1,525)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | (3,300)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |
Ending Balance | 99,057 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 85,025 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |
Auction Rate Securities Purchase Commitment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 797 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 2,205 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 902 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 2,600 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Total Realized and Unrealized Gains (Losses) | 105 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 395 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember |  |
Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 164 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | 236 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  |
Total Realized and Unrealized Gains (Losses) | (60)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | (166)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  |
Ending Balance | $ 104 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | $ 70 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  |

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