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Loans Receivable and Allowance for Loan Losses (Details 8) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 Relationship | Sep. 30, 2012 Relationship
Summarizes loans that were modified in a troubled debt restructuring |  |
Number of Relationships | 2 | 3
Pre-Modification Outstanding Recorded Investment | $ 5,279,773 | $ 9,940,882
Post-Modification Outstanding Recorded Investment | 1,414,890 | 6,075,999
Residential Real Estate [Member] |  |
Summarizes loans that were modified in a troubled debt restructuring |  |
Number of Relationships | 1 | 2
Pre-Modification Outstanding Recorded Investment | 374,773 | 5,035,882
Post-Modification Outstanding Recorded Investment | 363,691 | 5,024,800
Construction to permanent [Member] |  |
Summarizes loans that were modified in a troubled debt restructuring |  |
Number of Relationships | 1 | 1
Pre-Modification Outstanding Recorded Investment | 4,905,000 | 4,905,000
Post-Modification Outstanding Recorded Investment | $ 1,051,199 | $ 1,051,199

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- Definition Financing receivable modification number of contracts. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Receivable modification post modification recorded investment. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Financing receivable modification pre modification recorded investment. + References No definition available. + Details
Name: | pnbk_FinancingReceivableModificationPreModificationRecordedInvestment
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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