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Financial Instruments with Off-Balance Sheet Risk - Contractual Amounts Represent Credit Risk (Detail) (USD $) | Sep. 30, 2013
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Commitments to extend credit: |
Total Commitments to extend credit | $ 89,206,543
Future Loan Commitments [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 17,400,933
Home Equity Lines of Credit [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 29,241,288
Unused Lines of Credit [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 37,814,289
Undisbursed Construction Loans [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 3,690,036
Financial Standby Letters of Credit [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | $ 1,059,997

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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
Name: | pnbk_CommitmentsToExtendCreditAbstract
Namespace Prefix: | pnbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration