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Note 6 - Business Combination, Goodwill and Other Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	May 10, 2019
Goodwill, Ending Balance	$ 1,107,000		$ 1,107,000
Prime Bank [Member]
Goodwill, Ending Balance				$ 1,100,000
Prime Bank [Member] | Project Expenses [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred		$ 556,000
American Challenger [Member] | Project Expenses [Member]
Business Combination, Acquisition Related Costs	$ 1,900,000

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
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Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

+ References

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=pnbk_ProjectExpensesMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=pnbk_AmericanChallengerMember
Namespace Prefix:
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Balance Type:
Period Type: