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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: |