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

No definition available.

Name:	pnbk_MaximumPercentageOfCreditExtensionBasedOnMarketValueOfCollateral
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

Number of accruing loans.

+ References

No definition available.

+ Details

Name:	pnbk_NumberOfAccruingLoans
Namespace Prefix:	pnbk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of loans that paid off during the period.

+ References

No definition available.

+ Details

Name:	pnbk_NumberOfLoansPaidOff
Namespace Prefix:	pnbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of loans that were renewed during the period.

+ References

No definition available.

+ Details

Name:	pnbk_NumberOfLoansRenewed
Namespace Prefix:	pnbk_
Data Type:	xbrli:integerItemType
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 the non-accrual loan portfolio that is current with payments.

+ References

No definition available.

+ Details

Name:	pnbk_PercentOfNonaccrualLoansCurrent
Namespace Prefix:	pnbk_
Data Type:	num:percentItemType
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

Performance period under loan terms.

+ References

No definition available.

+ Details

Name:	pnbk_PerformancePeriodUnderLoanTerms
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
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

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

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

+ 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 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

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

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
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

- Definition

Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_ThresholdPeriodPastDueForWriteoffOfFinancingReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pnbk_LinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_NonAccrualLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- 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:

Note 3 - Loans Receivable and Allowance for Loan Losses (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	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	$ 511,000		$ 511,000		$ 866,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 4,000	$ 51,000	$ 8,000	$ 84,000
Maximum Period for Charged Off of Consumer Installment Loans			90 days
Performance Period Under Loan Terms			6 months
Number of Non-Accruing Loans	2		2
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 1,500,000		$ 1,500,000		1,800,000
Impaired Financing Receivable, Recorded Investment	11,938,000		11,938,000		11,724,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		7,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 11,938,000		$ 11,938,000		$ 11,717,000
Financing Receivable, Modifications, Number of Contracts			0
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	3		3		5
Lines 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					$ 279,000
Number of Loans Renewed			3
Number of Loans Paid Off			1
Lines of Credit [Member] \| 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					4
Non-Accrual Loans [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current	$ 131,000		$ 131,000		$ 138,000
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	$ 131,000		$ 131,000		138,000
Number of Non-Accruing Loans	1		1
Percent of Non-accrual Loans, Current	25.60%		25.60%
Impaired Financing Receivable, Recorded Investment	$ 8,002,000		$ 8,002,000		7,398,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,002,000		8,002,000		7,398,000
Commercial Real Estate Portfolio Segment [Member] \| Non-Accrual Loans [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Current	131,000		$ 131,000		138,000
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		719,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing					1,600,000
Impaired Financing Receivable, Recorded Investment	3,386,000		3,386,000		3,764,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 3,386,000		$ 3,386,000		$ 3,764,000
Residential Portfolio Segment [Member] \| 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 Non-Accruing Loans	1		1
Number of Accruing Loans					1
Consumer Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status					$ 7,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 7,000		$ 7,000
Impaired Financing Receivable, Recorded Investment	550,000		550,000		560,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment					7,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 550,000		$ 550,000		$ 553,000
Consumer Portfolio Segment [Member] \| 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 Non-Accruing Loans	2		2
Threshold Period Past Due for Write-off of Financing Receivable			120 days