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401(k) Savings Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Age	Dec. 31, 2011	Dec. 31, 2010
401(k) Savings Plan (Textual) [Abstract]
Period of service required for savings plan covering	6 months
Age required for savings plan covering	21
Company matching contribution	50.00%
Contribution to participants salary, maximum	6.00%
Company contribution towards savings plan	$ 160,000	$ 201,000	$ 206,000

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_
Data Type:	xbrli:durationItemType
Balance Type:	na
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- Details

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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

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- Definition

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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