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Note 11 - Subsequent Event (Details Textual) - Subsequent Event [Member] - $ / shares	Jul. 17, 2017	Aug. 01, 2017
Common Stock, Dividends, Per Share, Declared	$ 0.01
Prime Bank [Member]
Business Acquisition, Cash Consideration Percentage		115.00%

X

- Definition

The percentage of the acquirees tangible book value to be paid out as cash considerations in a business acquisition.

+ References

No definition available.

+ Details

Name:	pnbk_BusinessAcquisitionCashConsiderationPercentage
Namespace Prefix:	pnbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=pnbk_PrimeBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: