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Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring [Line Items]
Number of Relationships	2pnbk_FinancingReceivablePreModificationNumberOfContracts	2pnbk_FinancingReceivablePreModificationNumberOfContracts
Pre-Modification Outstanding Recorded Investment	$ 2,439us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 4,730us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Number of Relationships	2pnbk_FinancingReceivablePostModificationNumberOfContracts	1pnbk_FinancingReceivablePostModificationNumberOfContracts
Post-Modification Outstanding Recorded Investment	2,430us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	991us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring [Line Items]
Number of Relationships	2pnbk_FinancingReceivablePreModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Pre-Modification Outstanding Recorded Investment	2,439us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Number of Relationships	2pnbk_FinancingReceivablePostModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post-Modification Outstanding Recorded Investment	2,430us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Real Estate Construction to Permanent [Member]
Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring [Line Items]
Number of Relationships		2pnbk_FinancingReceivablePreModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Pre-Modification Outstanding Recorded Investment		4,730us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Number of Relationships		1pnbk_FinancingReceivablePostModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Post-Modification Outstanding Recorded Investment		$ 991us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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