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Financial Instruments with Off-Balance-Sheet Risk - Contractual Amounts Represent Credit Risk (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Commitments to extend credit: |  |
Total Commitments to extend credit | $ 79,323,662 | $ 89,537,884
Future Loan Commitments [Member] |  |
Commitments to extend credit: |  |
Total Commitments to extend credit | 7,102,437 | 16,601,019
Home Equity Lines of Credit [Member] |  |
Commitments to extend credit: |  |
Total Commitments to extend credit | 28,707,608 | 30,044,312
Unused Lines of Credit [Member] |  |
Commitments to extend credit: |  |
Total Commitments to extend credit | 40,207,868 | 39,652,231
Undisbursed Construction Loans [Member] |  |
Commitments to extend credit: |  |
Total Commitments to extend credit | 2,187,752 | 3,233,322
Financial Standby Letters of Credit [Member] |  |
Commitments to extend credit: |  |
Total Commitments to extend credit | $ 1,117,997 | $ 7,000

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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