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Note 14 - 401(k) Savings Plan (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Employee Eligible Service Period | 30 days |  |
Defined Benefit Plan, Eligible Age for Employee | 21 years |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00% |  |
Defined Contribution Plan, Employee Eligible Service Period for Employer Match | 180 days |  |
Defined Contribution Plan, Cost | $ 204,000 | $ 173,000 | $ 169,000

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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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- Definition The eligible service period required before an employee may participate in the employer match of the defined benefit plan. + References No definition available. + Details
Name: | pnbk_DefinedContributionPlanEmployeeEligibleServicePeriodForEmployerMatch
Namespace Prefix: | pnbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&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