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Note 9 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] $ in Thousands	Dec. 31, 2016 USD ($)
Other real estate owned, fair value	$ 851
Fair Value, Inputs, Level 1 [Member]
Other real estate owned, fair value
Fair Value, Inputs, Level 2 [Member]
Other real estate owned, fair value
Fair Value, Inputs, Level 3 [Member]
Other real estate owned, fair value	$ 851

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- 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

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- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
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- Details

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Data Type:	na
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- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
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Data Type:	na
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- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
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