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Note 18 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other real estate owned, fair value	$ 851
Impaired loans, fair value		$ 363
Fair Value, Inputs, Level 1 [Member]
Other real estate owned, fair value
Impaired loans, fair value
Fair Value, Inputs, Level 2 [Member]
Other real estate owned, fair value
Impaired loans, fair value
Fair Value, Inputs, Level 3 [Member]
Other real estate owned, fair value	$ 851
Impaired loans, fair value		$ 363

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_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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