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

No definition available.

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Namespace Prefix:	pnbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum period for charged off of consumer installment loans.

+ References

No definition available.

+ Details

Name:	pnbk_MaximumPeriodForChargedOffOfConsumerInstallmentLoans
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum period of credit extension of construction loans.

+ References

No definition available.

+ Details

Name:	pnbk_MaximumPeriodOfCreditExtensionOfConstructionLoans
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	pnbk_Note3LoansReceivableandAllowanceforLoanLossesDetailsLineItems
Namespace Prefix:	pnbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of loans on non-accruing status.

+ References

No definition available.

+ Details

Name:	pnbk_NumberOfNonAccruingLoans
Namespace Prefix:	pnbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of maximum loan to value.

+ References

No definition available.

+ Details

Name:	pnbk_PercentageOfMaximumLoanToValue
Namespace Prefix:	pnbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for charged off of close end credits.

+ References

No definition available.

+ Details

Name:	pnbk_PeriodForChargedOffOfCloseEndCredits
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for charged off of open end credits

+ References

No definition available.

+ Details

Name:	pnbk_PeriodForChargedOffOfOpenEndCredits
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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=49124121&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Financing receivables that are current.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ 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

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

+ Details

Name:	us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=pnbk_MultiFamilyRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=pnbk_ConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_NonAccrualLoansMember
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Note 3 - Loans Receivable and Allowance for Loan Losses (Details)	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2015	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
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
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 383,000			$ 383,000		$ 383,000	$ 866,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 3,000	$ 17,000		$ 8,000	$ 52,000
Maximum Period for Charged Off of Consumer Installment Loans				90 days
Number of Non-Accruing Loans	2			2		2
Impaired Financing Receivable, Recorded Investment	$ 11,727,000			$ 11,727,000		$ 11,727,000	11,724,000
Impaired Financing Receivable, Related Allowance	3,000			3,000		3,000	7,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,724,000			$ 11,724,000		$ 11,724,000	11,717,000
Financing Receivable, Modifications, Number of Contracts						0
Commercial Real Estate 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%
Financing Receivable, Recorded Investment, Nonaccrual Status							138,000
Impaired Financing Receivable, Recorded Investment	7,809,000			$ 7,809,000		$ 7,809,000	7,398,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,809,000			$ 7,809,000		7,809,000	$ 7,398,000
Financing Receivable, Modifications, Number of Contracts							1
Financing Receivable, Modifications, Pre-Modification Recorded Investment							$ 1,300,000
Financing Receivable, Modifications, Post-Modification Recorded Investment							1,200,000
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%
Construction Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Percentage of Maximum Loan to Value				75.00%
Residential Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 380,000			$ 380,000		$ 380,000	719,000
Number of Non-Accruing Loans	1			1		1
Impaired Financing Receivable, Recorded Investment	$ 3,366,000			$ 3,366,000		$ 3,366,000	3,764,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,366,000			3,366,000		3,366,000	3,764,000
Consumer Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 3,000			$ 3,000		$ 3,000	7,000
Number of Non-Accruing Loans	1			1		1
Impaired Financing Receivable, Recorded Investment	$ 552,000			$ 552,000		$ 552,000	560,000
Impaired Financing Receivable, Related Allowance	3,000			3,000		3,000	7,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	549,000			549,000		549,000	553,000
Non-Accrual Loans [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current	383,000			383,000		383,000	138,000
Non-Accrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current							$ 138,000
Non-Accrual Loans [Member] \| Residential Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current	380,000			380,000		380,000
Non-Accrual Loans [Member] \| Consumer Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current	$ 3,000			$ 3,000		$ 3,000