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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 135,579us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset $ 118,842us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
Home equity lines of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit 43,372us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember		 37,467us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
Commercial real estate, construction and development loans committed but not funded [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit 21,839us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= opof_CommercialRealEstateConstructionAndDevelopmentLoansCommittedButNotFundedMember		 22,528us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= opof_CommercialRealEstateConstructionAndDevelopmentLoansCommittedButNotFundedMember
Other lines of credit (principally commercial) [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit 70,368us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= opof_OtherCommercialLinesOfCreditMember		 58,847us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= opof_OtherCommercialLinesOfCreditMember
Letter of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to extend credit $ 3,586us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LetterOfCreditMember		 $ 4,498us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LetterOfCreditMember