Note 7 - Financial Instruments With Off-balance Sheet Risk (Details Textual)	Sep. 30, 2017 USD ($)
Banks Reserve Based on Analysis in Unfunded Commitments	$ 5,000

Banks reserve based on analysis in unfunded commitments.

No definition available.

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