Note 18 - Financial Instruments with Off-balance Sheet Risk (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Banks Reserve Based on Analysis in Unfunded Commitments	$ 8,000	$ 8,000

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