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Note 11 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value of Collateral Approach [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Impaired loans, net including PCI loans		$ 6,500
Impaired Loans [Member]
Impaired loans, net including PCI loans	$ 10,173
Impaired Loans [Member] | Minimum [Member]
Discount for appraisal type	0.00%	0.00%
Impaired Loans [Member] | Maximum [Member]
Discount for appraisal type	8.00%	8.00%
Other Real Estate Owned [Member]
Discount for appraisal type	14.00%
Other Real Estate Owned	$ 991

X

- Definition

Ratio of the adjusted appraised fair value of impaired loans produced by qualitative factors such as economic conditions and estimated liquidation expenses.

+ References

No definition available.

+ Details

Name:	pnbk_FairValueInputsAppraisedValueAdjustment
Namespace Prefix:	pnbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of impaired loans receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the fair value of other real estate owned.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=pnbk_FairValueOfCollateralApproachMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=pnbk_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=pnbk_OtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: