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Bank Call Loans - Summary of Bank Call Loans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Bank Call Loans [Abstract]    
Year-end balance $ 59,400us-gaap_BankLoans $ 118,200us-gaap_BankLoans
Weighted interest rate (at end of year) 1.22%opy_WeightedAverageInterestRate 1.28%opy_WeightedAverageInterestRate
Maximum balance (at any month-end) 197,000opy_BankLoansMaximumBalanceAtAnyMonthEnd 266,300opy_BankLoansMaximumBalanceAtAnyMonthEnd
Average amount outstanding (during the year) $ 108,235opy_BankCallLoansAverageAmountOutstandingDuringYear $ 164,434opy_BankCallLoansAverageAmountOutstandingDuringYear
Average interest rate (during the year) 1.26%opy_AverageInterestRates 1.25%opy_AverageInterestRates