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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2013
Minimum [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale security maturity period	5 years
Minimum [Member] | U. S. Government Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale security maturity period	5 years
Maximum [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale security maturity period	10 years
Maximum [Member] | U. S. Government Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale security maturity period	10 years

X

- Definition

Available for sale securities maturity period.

+ References

No definition available.

+ Details

Name:	pnbk_AvailableForSaleSecuritiesMaturityPeriod
Namespace Prefix:	pnbk_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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