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6. Fair Value Measurements, Level of Hierarchy (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Estimated Fair Value | $ 282,575 us-gaap_AvailableForSaleSecurities | $ 281,099 us-gaap_AvailableForSaleSecurities
Mortgage-backed securities |  |
Estimated Fair Value | 88,553 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 90,210 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 | 88,553 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 90,210 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 | 37,362 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 34,048 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 | 37,362 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 34,048 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 | 152,474 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 152,246 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 | 152,474 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 152,246 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 | 1,963 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 2,467 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 | 1,963 PEBK_AvailableforsaleSecuritiesLevelTwoValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember | 2,467 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 | 750 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 | 750 PEBK_AvailableforsaleSecuritiesLevelThreeValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Equity securities |  |
Estimated Fair Value | 1,473 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 1,378 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Level 1 valuation | 1,473 PEBK_AvailableforsaleSecuritiesLevelOneValuation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 1,378 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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