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2. Investment securities, Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Estimated Fair Value | $ 281,099 us-gaap_AvailableForSaleSecurities | $ 297,890 us-gaap_AvailableForSaleSecurities
Mortgage-backed securities |  |
Estimated Fair Value | 90,210 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 123,977 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Level 1 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Level 2 valuation | 90,210 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 123,977 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Level 3 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
U.S. Government sponsored enterprises |  |
Estimated Fair Value | 34,048 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 22,143 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Level 1 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Level 2 valuation | 34,048 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 22,143 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Level 3 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
State and political subdivisions |  |
Estimated Fair Value | 152,246 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 145,368 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Level 1 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Level 2 valuation | 152,246 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 145,368 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Level 3 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Corporate bonds |  |
Estimated Fair Value | 2,467 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 3,463 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Level 1 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Level 2 valuation | 2,467 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 3,463 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Level 3 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Trust preferred securities |  |
Estimated Fair Value | 750 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 1,250 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Level 1 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 0 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Level 2 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 0 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Level 3 valuation | 750 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember | 1,250 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Equity securities |  |
Estimated Fair Value | 1,378 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 1,689 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Level 1 valuation | 1,378 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 1,689 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Level 2 valuation | 0 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Level 3 valuation | $ 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ 0 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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