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Note 15 - Financial Instruments With Off-balance Sheet Risk (Details Textual) - USD ($)	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2017
Banks Reserve Based on Analysis in Unfunded Commitments	$ 8,000		$ 5,000
Interest Rate Swap [Member]
Derivative, Notional Amount		$ 5,000,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Banks reserve based on analysis in unfunded commitments.

+ References

No definition available.

+ Details

Name:	pnbk_BanksReserveBasedOnAnalysisInUnfundedCommitments
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: