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Note 12 - Regulatory and Operational Matters (Details Textual) $ in Billions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2019 USD ($)
Community Bank, Tier One Leverage Ratio			0.09
Community Bank, Tier One Leverage Capital Required for Capital Adequacy			$ 10
Banking Regulation, Tier One Leverage Capital Ratio, Actual	0.099	0.098

X

- Definition

Represents tier one capital required for capital adequacy for community bank.

+ References

No definition available.

+ Details

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

X

- Definition

Represents tier one leverage ratio for community bank.

+ References

No definition available.

+ Details

Name:	pnbk_CommunityBankTierOneLeverageRatio
Namespace Prefix:	pnbk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Ratio of Tier 1 capital to average assets as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

+ Details

Name:	us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant