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Commercial Mortgage Banking - Schedule of Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | $ 3,062 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |  |
2015 | 4,082 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |
2016 | 4,073 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |
2017 | 4,041 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |
2018 | 3,882 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |
Thereafter | 9,251 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |
Amortization expense | 28,391 us-gaap_ServicingAssetAtAmortizedValue | 30,140 us-gaap_ServicingAssetAtAmortizedValue | 29,226 us-gaap_ServicingAssetAtAmortizedValue | 28,879 us-gaap_ServicingAssetAtAmortizedValue
Originated MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 2,144 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
2015 | 2,857 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
2016 | 2,851 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
2017 | 2,825 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
2018 | 2,727 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
Thereafter | 7,187 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
Amortization expense | 20,591 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_OriginatedMortgageServicingRightsMember |  |  |
Purchased MSRs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
2014 | 918 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |
2015 | 1,225 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |
2016 | 1,222 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |
2017 | 1,216 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |
2018 | 1,155 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |
Thereafter | 2,064 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |
Amortization expense | $ 7,800 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_PurchasedMortgageServicingRightsMember |  |  |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + 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 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 3: 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 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=56950315&loc=d3e122739-111746 + Details
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