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Note 14 - 401(k) Savings Plan (Details) (USD $)	12 Months Ended
	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	$ 132,000us-gaap_DefinedContributionPlanCostRecognized	$ 130,000us-gaap_DefinedContributionPlanCostRecognized	$ 160,000us-gaap_DefinedContributionPlanCostRecognized

X

- Definition

The specified age to be eligible for defined benefit plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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