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Loans Receivable and Allowance for Loan Losses (Details 8) (USD $) | 3 Months Ended
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Mar. 31, 2013 Relationship
Summarizes loans that were modified in a troubled debt restructuring |
Number of Relationships, Pre-Modification | 2
Number of Relationships, Post-Modification | 2
Pre-Modification Outstanding Recorded Investment | $ 4,730,324
Post-Modification Outstanding Recorded Investment | 4,730,324
Construction to permanent [Member] |
Summarizes loans that were modified in a troubled debt restructuring |
Number of Relationships, Pre-Modification | 2
Number of Relationships, Post-Modification | 2
Pre-Modification Outstanding Recorded Investment | 4,730,324
Post-Modification Outstanding Recorded Investment | $ 4,730,324

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

X
- 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

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

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

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