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401(k) Savings Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Sale Of Subsidiary [Abstract]
Period of service required for savings plan covering	6 months
Age required for savings plan covering	21 years
Company matching contribution	50.00%
Contribution to participants salary, maximum	6.00%
Company contribution towards savings plan	$ 130,000	$ 160,000	$ 201,000

X

- Definition

Defined benefit plan eligible age for employee.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Defined benefit plan employee eligible service period.

+ References

No definition available.

+ Details

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Namespace Prefix:	pnbk_
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Balance Type:	na
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- Details

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Namespace Prefix:	pnbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
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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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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

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Namespace Prefix:	us-gaap_
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X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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