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Bank Call Loans (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Bank Call Loans | Expressed in thousands of dollars, except percentages.
|  | 2012 |  |  | 2011 |
Year-end balance |  | $ | 128,300 |  |  | $ | 27,500 |
Weighted interest rate (at end of year) |  |  | 1.23 | % |  |  | 1.25 | %
Maximum balance (at any month end) |  | $ | 171,400 |  |  | $ | 178,600 |
Average amount outstanding (during the year) |  | $ | 73,227 |  |  | $ | 92,657 |
Average interest rate (during the year) |  |  | 1.27 | % |  |  | 1.25 | %

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- Definition Schedule Of Bank Call Loans [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration