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Note 20 - Subsequent Event (Details Textual) - Subsequent Event [Member] $ in Millions	Feb. 06, 2018 USD ($)
Hana SBL [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans and Servicing Rights	$ 120
Business Combination, Servicing Rights Purchased, Loan Amount	370
Payments to Acquire Businesses, Gross	83
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	41
Hana SBL [Member]
SBA 7 (a) Loan Amount Originated	$ 1,000

X

- Definition

Represents the amount of loans and servicing rights assumed at the acquisition date.

+ References

No definition available.

+ Details

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Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of loans on which the servicing right is purchased in the business acquisition transaction.

+ References

No definition available.

+ Details

Name:	pnbk_BusinessCombinationServicingRightsPurchasedLoanAmount
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of SBA 7 (a) loan amount originated since inception.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of liabilities assumed at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

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

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=pnbk_HanaSBLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=pnbk_HanaSBLMember
Namespace Prefix:
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Period Type: