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Note 12 - Fair Value and Interest Rate Risk (Details Textual) - USD ($) | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Solomon Hess SBA Loan Fund [Member] |  |  |
Other Investments |  | $ 4,500,000 |
Other Investments | $ 4,450,000 |  | $ 4,450,000

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- Definition Amount of investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_OtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | invest_InvestmentAxis=pnbk_SolomonHessSBALoanFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |