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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: |