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Note 14 - 401(k) Savings Plan (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined Benefit Plan Employee Eligible Service Period | 6 months |  |
Defined Benefit Plan Eligible Age for Employee | 21 years |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |
Defined Contribution Plan, Cost Recognized | $ 132,000 us-gaap_DefinedContributionPlanCostRecognized | $ 130,000 us-gaap_DefinedContributionPlanCostRecognized | $ 160,000 us-gaap_DefinedContributionPlanCostRecognized

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- Definition The specified age to be eligible for defined benefit plan. + References No definition available. + Details
Name: | pnbk_DefinedBenefitPlanEligibleAgeForEmployee
Namespace Prefix: | pnbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition A defined benefit pension plan is a type of pension plan in which an employer/sponsor promises a specified monthly. + References No definition available. + Details
Name: | pnbk_DefinedBenefitPlanEmployeeEligibleServicePeriod
Namespace Prefix: | pnbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration