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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

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- 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: |