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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] $ in Thousands	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Impaired loans, net	$ 28,426	$ 19,673
Other Real Estate Owned	$ 2,945	$ 2,945
Other Real Estate Owned	0.14	0.14
Minimum [Member]
Impaired loans, net	0.08	0.08
Maximum [Member]
Impaired loans, net	0.21	0.21

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

Value of input used to measure impaired loans.

+ References

No definition available.

+ Details

Name:	pnbk_ImpairedLoansMeasurementInput
Namespace Prefix:	pnbk_
Data Type:	xbrli:decimalItemType
Balance Type:	na
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

- Definition

Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
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:	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: