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Commercial Mortgage Banking - Additional Information (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Servicing Liability at Amortized Cost [Line Items] |  |  |
Company owned OMHHF | 83.68%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions |  |
Prepayment costs | $ 9,800,000 opy_PrepaymentPenaltyCharges | $ 14,500,000 opy_PrepaymentPenaltyCharges | $ 7,400,000 opy_PrepaymentPenaltyCharges
Custodial escrow accounts | 285,500,000 us-gaap_EscrowDeposit | 251,400,000 us-gaap_EscrowDeposit |
Uninsured balance relation to escrow accounts | 165,000,000 us-gaap_CashUninsuredAmount |  |
Carrying value of loan servicing rights | 30,140,000 us-gaap_ServicingAssetAtAmortizedValue | 28,879,000 us-gaap_ServicingAssetAtAmortizedValue | 26,983,000 us-gaap_ServicingAssetAtAmortizedValue
Servicing rights are amortized using straight-line method | 10 years |  |
Mortgage Servicing Rights |  |  |
Servicing Liability at Amortized Cost [Line Items] |  |  |
Fair value of servicing rights | 42,300,000 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FinancialInstrumentAxis = opy_MortgageServicingRightsMember | 40,100,000 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FinancialInstrumentAxis = opy_MortgageServicingRightsMember |
Carrying value of loan servicing rights | $ 30,100,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = opy_MortgageServicingRightsMember | $ 28,900,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = opy_MortgageServicingRightsMember |
OMHHF |  |  |
Servicing Liability at Amortized Cost [Line Items] |  |  |
Non-controlling interest | 16.32%opy_NonControllingInterestPercentage / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = opy_OppenheimerMultiFamilyHousingAndHealthcareFinanceMember |  |
Number of related party | 1 opy_NumberOfRelatedParty / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = opy_OppenheimerMultiFamilyHousingAndHealthcareFinanceMember |  |

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- Definition Prepayment penalty charges. + References No definition available. + Details
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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