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Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Troubled Debt Restructured Loans (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Number of loans	1us-gaap_FinancingReceivableModificationsNumberOfContracts2	2us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled debt restructured loan amount	$ 1,131,000us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 2,188,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Accrual and Past Due Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Troubled debt restructured loan amount	1,131,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember	991,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Accrual and Past Due Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Troubled debt restructured loan amount	1,131,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember	991,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Non-Accrual Loans [Member] | Real Estate Construction to Permanent [Member]
Financing Receivable, Modifications [Line Items]
Number of loans		1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Troubled debt restructured loan amount		1,197,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Non-Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of loans		1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Troubled debt restructured loan amount		1,197,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Troubled debt restructured loan amount	1,131,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	991,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Real Estate Construction to Permanent [Member]
Financing Receivable, Modifications [Line Items]
Number of loans		1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Troubled debt restructured loan amount		$ 1,197,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember

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- Definition

Number of financing receivables that have been 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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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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