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Note 18 - 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 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Impaired loans, net | $ 19,673 | $ 6,500
Other Real Estate Owned | $ 2,945 |
Other Real Estate Owned | 14 |
Impaired loans, net | $ 19,673 | $ 6,500
Minimum [Member] |  |
Impaired loans, net | 8 | 0
Maximum [Member] |  |
Impaired loans, net | 21 | 8

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 Fair value portion of impaired PCI loans receivables. + References No definition available. + Details
Name: | pnbk_ImpairedPCILoansFairValue
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure impaired PCI loans. + References No definition available. + Details
Name: | pnbk_ImpairedPciLoansMeasurementInput
Namespace Prefix: | pnbk_
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: |