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Note 3 - Loans Receivable and Allowance for Loan Losses (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Maximum Period of Credit Extension of Construction Loans	18 months
Period for Charged Off of Open-End Credits	180 days
Period for Charged Off of Close-End Credits	120 days
Recorded Balance of Non-Accrual Loans	$ 515,000pnbk_RecordedBalanceOfNonAccrualLoans		$ 866,000pnbk_RecordedBalanceOfNonAccrualLoans
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	4,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	33,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Maximum Period for Charged Off of Consumer Installment Loans	90 days
Performance Period Under Loan Terms			6 months
Percent of NonAccruing Loan Balance	26.00%pnbk_PercentOfNonAccruingLoanBalance
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,500,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing		1,800,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Impaired Financing Receivable, Recorded Investment	12,230,000us-gaap_ImpairedFinancingReceivableRecordedInvestment		11,724,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment		7,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	12,230,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment		11,717,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Financing Receivable Modifications Number of Contracts During Period	0pnbk_FinancingReceivableModificationsNumberOfContractsDuringPeriod
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Number of Accruing Loans			1pnbk_NumberOfAccruingLoans / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Line of Credit [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Number of Accruing Loans			4pnbk_NumberOfAccruingLoans / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Number of Accruing Loans	1pnbk_NumberOfAccruingLoans / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember		5pnbk_NumberOfAccruingLoans / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Commercial Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Maximum Percentage of Credit Extension Based on Market Value of Collateral	75.00%pnbk_MaximumPercentageOfCreditExtensionBasedOnMarketValueOfCollateral / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Impaired Financing Receivable, Recorded Investment			2,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment			2,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Multi-family Real Estate [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Maximum Percentage of Credit Extension Based on Market Value of Collateral	80.00%pnbk_MaximumPercentageOfCreditExtensionBasedOnMarketValueOfCollateral / us-gaap_FinancingReceivablePortfolioSegmentAxis = pnbk_MultiFamilyRealEstateMember
Construction to Permanent [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Percentage of Maximum Loan to Value	75.00%pnbk_PercentageOfMaximumLoanToValue / us-gaap_FinancingReceivablePortfolioSegmentAxis = pnbk_ConstructionToPermanentMember
Residential Mortgage [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1,600,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Non-Accrual Loans [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current	135,000us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualLoansMember
Line of Credit [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			$ 279,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember

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- Definition

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- Definition

Maximum percentage of credit extension based on market value of collateral.

+ References

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- Definition

Maximum period for charged off of consumer installment loans.

+ References

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- Definition

Maximum period of credit extension of construction loans.

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Number of accruing loans.

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- Definition

Percentage of maximum loan to value.

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- Definition

The percentage of non-accruing loan balance which is current.

+ References

No definition available.

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- Definition

Performance period under loan terms.

+ References

No definition available.

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- Definition

Period for charged off of close end credits.

+ References

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- Definition

Recorded balance of non accrual loans.

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524

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- Definition

Financing receivables that are current.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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-Topic 310

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

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