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Note 9 - Commitments and Contingencies (Details Textual)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Lessee Leasing Arrangements, Operating Leases, Number of Operating Leases	8
Operating Leases, Rent Expense, Net	$ 953,000	$ 1,100,000	$ 1,100,000
Operating Leases, Income Statement, Sublease Revenue	399,000	414,000	402,000
Operating Leases, Income Statement, Sublease Rental Costs	5,000	$ 5,000	$ 4,000
Operating Leases, Future Minimum Payments Receivable	$ 1,400,000
Operating Lease for Bank Branch Locations [Member]
Lessee Leasing Arrangements, Operating Leases, Number of Operating Leases	5
Operating Lease for Administrative and Operational Space [Member]
Lessee Leasing Arrangements, Operating Leases, Number of Operating Leases	3

X

- Definition

The number of operating leases in the lessee's leasing arrangements with third parties.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of rental costs recognized for the period under subleasing arrangements.

+ References

No definition available.

+ Details

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

X

- Definition

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

+ Details

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

X

- Definition

The amount of revenue recognized for the period under subleasing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=77891322&loc=d3e41620-112719

+ Details

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

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: