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Note 23 - Subsequent Event (Details Textual) - American Challenger [Member] - Subsequent Event [Member] $ / shares in Units, $ in Millions	Jan. 28, 2022 USD ($) $ / shares shares
Business Combination, Consideration Transferred, Structuring and Advisory Fee	$ 6.5
Business Combination, Maximum Reimbursement of Cash Compensation to Employees	7.8
Business Combination, Maximum Payment of Deferred Compensation Forfeited	$ 4.7
Business Acquisition, Potential Warrants to be Issued, Maximum Number of Shares (in shares) | shares	1,132,000
Business Acquisition, Additional Payment Amount Per Share (in dollars per share) | $ / shares	$ 17.69

X

- Definition

The per share amount of additional payment arrangement for shares to be issued in a business acquisition

+ References

No definition available.

+ Details

Name:	pnbk_BusinessAcquisitionAdditionalPaymentAmountPerShare
Namespace Prefix:	pnbk_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Maximum number of securities into which the class of warrant or right may be converted for warrants that could be issued under in a business combination.

+ References

No definition available.

+ Details

Name:	pnbk_BusinessAcquisitionPotentialWarrantsToBeIssuedMaximumNumberOfShares
Namespace Prefix:	pnbk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of structuring and advisory fee incurred by the acquirer as part of consideration transferred in a business combination.

+ References

No definition available.

+ Details

Name:	pnbk_BusinessCombinationConsiderationTransferredStructuringAndAdvisoryFee
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of maximum payments for deferred compensation forfeited in a business combination.

+ References

No definition available.

+ Details

Name:	pnbk_BusinessCombinationMaximumPaymentOfDeferredCompensationForfeited
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of maximum reimbursement of cash compensation to employees as part of consideration transferred in a business combination.

+ References

No definition available.

+ Details

Name:	pnbk_BusinessCombinationMaximumReimbursementOfCashCompensationToEmployees
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: