Regulatory and Operational Matters - Regulatory Capital Amounts and Ratios (Details) $ in Thousands	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Parent Company
Total Capital (to risk weighted assets):
Actual	$ 103,357	$ 44,534
For capital adequacy	$ 50,166	$ 58,667
Actual	0.1648	0.0607
For capital adequacy	0.0800	0.0800
Individual minimum capital ratio	0	0
Tier 1 Capital (to risk weighted assets):
Actual	$ 90,380	$ 33,545
For capital adequacy	$ 37,625
For capital adequacy		$ 44,001
Actual	0.1441	0.0457
For capital adequacy	0.0600
For capital adequacy		0.0600
Individual minimum capital ratio	0	0
Common Equity Tier 1 Capital (to risk weighted assets):
Actual	$ 82,380	$ 25,545
For capital adequacy	$ 28,219	$ 33,000
Actual	0.1314	0.0348
For capital adequacy	0.0450	0.0450
Individual minimum capital ratio	0	0
Tier 1 Leverage Capital (to average assets):
Actual	$ 90,380	$ 33,545
For capital adequacy	$ 38,785	$ 38,368
Actual	0.0932	0.0350
For capital adequacy	0.0400	0.0400
Individual minimum capital ratio	0	0
Subsidiaries
Total Capital (to risk weighted assets):
Actual	$ 102,531	$ 56,536
To be Well Capitalized	62,731	73,309
For capital adequacy	50,185	58,648
Individual minimum capital ratio	$ 72,141	$ 84,306
Actual	0.1634	0.0771
To be Well Capitalized	0.1000	0.1000
For capital adequacy	0.0800	0.0800
Individual minimum capital ratio	0.1150	0.1150
Tier 1 Capital (to risk weighted assets):
Actual	$ 97,902	$ 55,546
To be Well Capitalized	50,185	58,648
For capital adequacy	37,639	43,986
Individual minimum capital ratio	$ 62,731	$ 73,309
Actual	0.1561	0.0758
To be Well Capitalized	0.0800	0.0800
For capital adequacy	0.0600	0.0600
Individual minimum capital ratio	0.1000	0.1000
Common Equity Tier 1 Capital (to risk weighted assets):
Actual	$ 97,902	$ 55,546
To be Well Capitalized	40,775	47,651
For capital adequacy	28,229	32,989
Individual minimum capital ratio	$ 62,731	$ 73,309
Actual	0.1561	0.0758
To be Well Capitalized	0.0650	0.0650
For capital adequacy	0.0450	0.0450
Individual minimum capital ratio	0.1000	0.1000
Tier 1 Leverage Capital (to average assets):
Actual	$ 97,902	$ 55,546
To be Well Capitalized	48,479	47,948
For capital adequacy	38,783	38,358
Individual minimum capital ratio	$ 87,262	$ 86,306
Actual	0.1010	0.0579
To be Well Capitalized	0.0500	0.0500
For capital adequacy	0.0400	0.0400
Individual minimum capital ratio	0.0900	0.0900

Banking Regulation, Common Equity Tier 1 Risk-Based Capital, OCC Requirements, Minimum

No definition available.

Name:	pnbk_BankingRegulationCommonEquityTier1RiskBasedCapitalOCCRequirementsMinimum
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, OCC Requirements, Minimum

+ References

No definition available.

+ Details

Name:	pnbk_BankingRegulationCommonEquityTier1RiskBasedCapitalRatioOCCRequirementsMinimum
Namespace Prefix:	pnbk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Banking Regulation, Tier 1 Leverage Capital, OCC Requirements, Minimum

+ References

No definition available.

+ Details

Name:	pnbk_BankingRegulationTier1LeverageCapitalOCCRequirementsMinimum
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Banking Regulation, Tier 1 Leverage Capital Ratio, OCC Requirements, Minimum

+ References

No definition available.

+ Details

Name:	pnbk_BankingRegulationTier1LeverageCapitalRatioOCCRequirementsMinimum
Namespace Prefix:	pnbk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Banking Regulation, Tier 1 Risk-Based Capital, OCC Requirements, Minimum

+ References

No definition available.

+ Details

Name:	pnbk_BankingRegulationTier1RiskBasedCapitalOCCRequirementsMinimum
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Banking Regulation, Tier 1 Risk-Based Capital Ratio, OCC Requirements, Minimum

+ References

No definition available.

+ Details

Name:	pnbk_BankingRegulationTier1RiskBasedCapitalRatioOCCRequirementsMinimum
Namespace Prefix:	pnbk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Banking Regulation, Tier 1 Risk-Based Capital Ratio, Undercapitalized, Minimum, Amount

+ References

No definition available.

+ Details

Name:	pnbk_BankingRegulationTier1RiskBasedCapitalRatioUndercapitalizedMinimumAmount
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Individual Minimum Capital Ratio

+ References

No definition available.

+ Details

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

- Definition

Individual Minimum Capital Ratio Percentage

+ References

No definition available.

+ Details

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

- Definition

Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

+ Details

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

- Definition

Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as undercapitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Amount of total capital as defined by regulatory framework.

+ References

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_CapitalAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework.

+ References

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_CommonEquityTierOneCapitalAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Common Equity Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Common Equity Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_LeverageRatiosAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of Tier 1 leverage capital as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

Amount of Tier 1 risk-based capital as defined by regulatory framework.

+ References

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

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

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: