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Bank call loans - Schedule of Bank Call Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Bank Call Loans [Abstract] |  |
Year-end balance | $ 252,100 | $ 0
Weighted interest rate (at end of year) (as a percent) | 5.12% | 0.00%
Maximum balance (at any month-end) | $ 288,200 | $ 131,900
Average amount outstanding (during the year) | $ 167,691 | $ 49,387
Average interest rate (during the year) (as a percent) | 5.44% | 4.20%

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- Definition Average interest rates. + References No definition available. + Details
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- Definition Bank Call Loans [Abstract] + References No definition available. + Details
Name: | opy_BankCallLoansAbstract
Namespace Prefix: | opy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Bank Call Loans Average Amount Outstanding + References No definition available. + Details
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Namespace Prefix: | opy_
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Balance Type: | debit
Period Type: | duration

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- Definition Bank loans maximum balance at any month end. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Weighted average interest rate. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | dtr-types1:percentItemType
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Period Type: | instant

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- Definition Amount of short-term bank loan secured by broker-dealer customer's security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
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Balance Type: | credit
Period Type: | instant