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Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items] |
Commitments to extend credit | $ 84,461 pnbk_CommitmentsToExtendCredit
Future Loan Commitments [Member] |
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items] |
Commitments to extend credit | 19,734 pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_FutureLoanCommitmentsMember
Home Equity Lines of Credit [Member] |
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items] |
Commitments to extend credit | 23,608 pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_HomeEquityLinesOfCreditMember
Unused Line of Credit [Member] |
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items] |
Commitments to extend credit | 33,923 pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_UnusedLineOfCredit1Member
Undisbursed Construction Loans [Member] |
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items] |
Commitments to extend credit | 6,071 pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_UndisbursedConstructionLoansMember
Financial Standy Letter of Credit [Member] |
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items] |
Commitments to extend credit | $ 1,125 pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_FinancialStandyLetterOfCredit1Member

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- Definition Commitments to extend credit. + References No definition available. + Details
Name: | pnbk_CommitmentsToExtendCredit
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_FinancialStandyLetterOfCredit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_FutureLoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_HomeEquityLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_UndisbursedConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_UnusedLineOfCredit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |