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Note 17 - 401(k) Savings Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Employee Eligible Service Period (Month)	1 month
Defined Benefit Plan, Eligible Age for Employee (Year)	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 (Month)	6 months
Defined Contribution Plan, Employee Eligible Service Period for Employer Match, Alternative Option, Hours	500
Defined Contribution Plan, Cost	$ 215,000	$ 253,000	$ 251,000

X

- 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

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

- 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

X

- Definition

The alternative option of hours for 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_DefinedContributionPlanEmployeeEligibleServicePeriodForEmployerMatchAlternativeOptionHours
Namespace Prefix:	pnbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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:	dtr-types: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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration