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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Consolidated Statement of Comprehensive Income [Abstract]    
Net income $ 4,116us-gaap_NetIncomeLoss $ 3,163us-gaap_NetIncomeLoss
Unrealized gains on securities    
Less reclassification adjustment for gains recognized in income 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (26)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Net unrealized gains on securities 5,239us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (11,422)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Amortization of loss on securities transferred from held to maturity 551opof_AmortizationOfLossOnSecuritiesTransferredFromHeldToMaturity 176opof_AmortizationOfLossOnSecuritiesTransferredFromHeldToMaturity
Defined benefit pension plans    
Net actuarial loss for the period (1,587)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 661us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Settlement loss due to early retirement program 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax
Amortization of actuarial loss from prior period (251)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1] (303)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1]
Tax effect of pension adjustments 455us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (328)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Total effect of defined benefit pension plans (881)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent 636us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Other comprehensive income 4,909us-gaap_OtherComprehensiveIncomeLossNetOfTax (10,610)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 9,025us-gaap_ComprehensiveIncomeNetOfTax $ (7,447)us-gaap_ComprehensiveIncomeNetOfTax
[1] This accumulated other comprehensive loss component is included in the computation of net periodic pension cost (see NOTE 13. Pension Plan for additional details).