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

No definition available.

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Period Type:	duration

- Definition

Maximum period for charged off of consumer installment loans.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Maximum period of credit extension of construction loans.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of borrowers in loan transactions.

+ References

No definition available.

+ Details

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

- 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

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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

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

- Definition

Proceeds from financing receivable restructured loan paid off.

+ References

No definition available.

+ Details

Name:	pnbk_ProceedsFromFinancingReceivableRestructuredLoanPaidOff
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

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

+ Details

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

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ 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 (c)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

+ Details

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

- 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

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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

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ 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

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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

+ 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_LoanRestructuringModificationAxis=pnbk_RestructuredMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=pnbk_UpgradedToPassImpairedMember
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Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_NonAccrualLoansMember
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Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_UpgradedAsToRiskRatingMember
Namespace Prefix:
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Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_PaidOffMember
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Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_UpgradedMember
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- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
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Data Type:	na
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- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=pnbk_MultiFamilyRealEstateMember
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Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=pnbk_ConstructionToPermanentPortfolioSegmentMember
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Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=pnbk_DowngradedMember
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=pnbk_ConstructionToPermanentRealEstateFinancingReceivableLoanOneMember
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
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Note 4 - Loan Receivables and Allowance for Loan Losses (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 4 - Loan Receivables 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
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 83,000	$ 23,000	$ 310,000
Threshold Period Past Due for Write-off of Financing Receivable	90 days
Maximum Period for Charged Off of Consumer Installment Loans	180 days
Performance Period Under Loan Terms	6 months
Financing Receivable, Modifications, Number of Contracts	0	2
Financing Receivable, Modifications, Recorded Investment		$ 2,400,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0	$ 0
Number of Borrowers	11	14
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 2,439,000	4,730,000
Impaired loans	$ 12,851,000	11,717,000
Impaired Financing Receivable, Related Allowance	3,000	$ 7,000
Restructured [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Recorded Investment		$ 1,200,000
Upgraded to Pass Impaired [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,300,000
Non-Accrual Loans [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 0	0	$ 198,000
Upgraded as to Risk Rating [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 3,700,000
Paid Off [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		4
Upgraded [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		2
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Maximum Percentage of Credit Extension Based on Market Value of Collateral	75.00%
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 2,439,000
Proceeds from Financing Receivable Restructured Loan Paid Off		3,900,000
Impaired loans	$ 7,745,000	$ 7,398,000
Commercial Real Estate Portfolio Segment [Member] \| Paid Off [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		2
Multi-family Real Estate [Member]
Note 4 - Loan Receivables 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 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Percentage of Maximum Loan to Value	75.00%
Construction to Permanent Portfolio Segment [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Number of Borrowers			1
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 4,730,000
Construction to Permanent Portfolio Segment [Member] \| Downgraded [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts			2
Construction to Permanent Real Estate Financing Receivable Loan One [Member] \| Downgraded [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 3,700,000
Construction to Permanent Real Estate Financing Receivable Loan Two [Member] \| Downgraded [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 1,000,000
Commercial Portfolio Segment [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Proceeds from Financing Receivable Restructured Loan Paid Off		$ 37,000
Impaired loans		2,000
Residential Portfolio Segment [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Proceeds from Financing Receivable Restructured Loan Paid Off		4,400,000
Financing Receivable, Allowance for Credit Losses, Write-downs		500,000
Impaired loans	$ 4,556,000	3,764,000
Residential Portfolio Segment [Member] \| Upgraded [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 347,000
Residential Portfolio Segment [Member] \| Charged Off [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Consumer Portfolio Segment [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Impaired loans	550,000	$ 553,000
Impaired Financing Receivable, Related Allowance	$ 3,000	7,000
Consumer Portfolio Segment [Member] \| Upgraded [Member] \| Home Equity Loan [Member]
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 563,000