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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Securities purchased under agreements to resell | $ 0 us-gaap_SecuritiesPurchasedUnderAgreementsToResell | $ 251,606 us-gaap_SecuritiesPurchasedUnderAgreementsToResell
Nonrecurring [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Cash | 38,843 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 32,632 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 1,517 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 18,594 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Deposits With Clearing Organizations | 22,064 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 12,322 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Deposits paid for securities borrowed | 266,563 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 242,172 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivables from brokers | 25,663 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 38,149 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to deliver | 19,248 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 11,055 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations | 23,857 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 21,106 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other | 2,772 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,993 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total Receivable from brokers, dealers and clearing organizations | 338,103 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 314,475 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivable from customers | 890,260 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 864,189 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities purchased under agreements to resell |  | 1,606 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Mortgage servicing rights (MSRs) | 40,772 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 42,279 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Drafts payable | 34,615 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 35,373 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Bank call loans | 101,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 59,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Deposits received for securities loaned | 165,005 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 137,892 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Payable To Correspondent Brokers | 7,347 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 4,559 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to receive | 18,557 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 23,573 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations and other | 159,321 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 91,137 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total payables to brokers, dealers and clearing organizations | 350,230 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 257,161 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Payables to customers | 704,087 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 652,256 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities sold under agreements to repurchase | 397,389 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 687,440 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Warehouse payable | 87,562 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 16,683 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Senior secured notes | 157,407 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 157,782 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 1 [Member] | Nonrecurring [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Cash | 38,843 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 32,632 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 1,517 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 18,594 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Deposits With Clearing Organizations | 22,064 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 12,322 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities purchased under agreements to resell |  | 1,606 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Drafts payable | 34,615 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 35,373 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 2 [Member] | Nonrecurring [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Deposits paid for securities borrowed | 266,563 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 242,172 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivables from brokers | 25,663 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 38,149 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to deliver | 19,248 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 11,055 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations | 23,857 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 21,106 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other | 2,772 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,993 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total Receivable from brokers, dealers and clearing organizations | 338,103 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 314,475 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivable from customers | 890,260 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 864,189 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Bank call loans | 101,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 59,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Deposits received for securities loaned | 165,005 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 137,892 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Payable To Correspondent Brokers | 7,347 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 4,559 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to receive | 18,557 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 23,573 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations and other | 159,321 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 91,137 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total payables to brokers, dealers and clearing organizations | 350,230 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 257,161 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Payables to customers | 704,087 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 652,256 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities sold under agreements to repurchase | 397,389 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 687,440 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Warehouse payable | 87,562 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 16,683 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Senior secured notes | 157,407 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 157,782 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 3 [Member] | Nonrecurring [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Mortgage servicing rights (MSRs) | 40,772 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 42,279 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Carrying Value [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Fair Value Estimate Not Practicable Deposits With Clearing Organizations |  | 12,322 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Value [Member] | Nonrecurring [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Cash | 38,843 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 32,632 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 1,517 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 18,594 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Deposits With Clearing Organizations | 22,064 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Deposits paid for securities borrowed | 266,563 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 242,172 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivables from brokers | 25,663 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 38,149 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to deliver | 19,248 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 11,055 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations | 23,857 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 21,106 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other | 2,772 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,993 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total Receivable from brokers, dealers and clearing organizations | 338,103 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 314,475 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivable from customers | 890,260 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 864,189 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities purchased under agreements to resell |  | 1,606 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Mortgage servicing rights (MSRs) | 28,391 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 30,140 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Drafts payable | 34,615 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 35,373 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Bank call loans | 101,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 59,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Deposits received for securities loaned | 165,005 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 137,892 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Payable To Correspondent Brokers | 7,347 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 4,559 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to receive | 18,557 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 23,573 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations and other | 159,321 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 91,137 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total payables to brokers, dealers and clearing organizations | 350,230 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 257,161 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Payables to customers | 704,087 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 652,256 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities sold under agreements to repurchase | 397,389 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 687,440 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Warehouse payable | 87,562 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 16,683 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Senior secured notes | 150,000 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 150,000 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Fair Value Estimate Not Practicable Deposits With Clearing Organizations |  | 12,322 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value [Member] | Nonrecurring [Member] |  |
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Cash | 38,843 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 32,632 us-gaap_FairValueEstimateNotPracticableCashAndCashEquivalents / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Cash And Securities Segregated Under Federal And Other Regulations | 1,517 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 18,594 opy_FairValueEstimateNotPracticableCashAndSecuritiesSegregatedUnderFederalAndOtherRegulations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Deposits With Clearing Organizations | 22,064 opy_FairValueEstimateNotPracticableDepositsWithClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Deposits paid for securities borrowed | 266,563 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 242,172 opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivables from brokers | 25,663 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 38,149 opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to deliver | 19,248 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 11,055 opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations | 23,857 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 21,106 opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other | 2,772 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 1,993 opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total Receivable from brokers, dealers and clearing organizations | 338,103 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 314,475 opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Receivable from customers | 890,260 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 864,189 opy_FairValueEstimateNotPracticableReceivablesFromCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities purchased under agreements to resell |  | 1,606 us-gaap_SecuritiesPurchasedUnderAgreementsToResell / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Mortgage servicing rights (MSRs) | 40,772 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 42,279 opy_FairValueEstimateNotPracticableMortgageServicingRights / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Drafts payable | 34,615 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 35,373 opy_FairValueEstimateNotPracticableDraftsPayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Bank call loans | 101,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 59,400 opy_FairValueEstimateNotPracticableBankLoans / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Deposits received for securities loaned | 165,005 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 137,892 opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Estimate Not Practicable Payable To Correspondent Brokers | 7,347 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 4,559 opy_FairValueEstimateNotPracticablePayableToCorrespondentBrokers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities failed to receive | 18,557 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 23,573 opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Clearing organizations and other | 159,321 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 91,137 opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Total payables to brokers, dealers and clearing organizations | 350,230 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 257,161 opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Payables to customers | 704,087 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 652,256 opy_FairValueEstimateNotPracticablePayablesToCustomers / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Securities sold under agreements to repurchase | 397,389 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 687,440 us-gaap_FairValueEstimateNotPracticableSecuritiesLoanedOrSoldUnderAgreementsToRepurchase / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Warehouse payable | 87,562 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 16,683 opy_FairValueEstimateNotPracticableWarehousePayable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Senior secured notes | $ 157,407 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 157,782 us-gaap_FairValueEstimateNotPracticableSeniorDebtObligations / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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