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Note 11 - Fair Value and Interest Rate Risk (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Note 11 - Fair Value and Interest Rate Risk (Details) [Line Items] |  |
Other Investments | $ 4,450 us-gaap_OtherInvestments | $ 4,450 us-gaap_OtherInvestments
Solomon Hess SBA Loan Fund [Member] |  |
Note 11 - Fair Value and Interest Rate Risk (Details) [Line Items] |  |
Other Investments | $ 4,500 us-gaap_OtherInvestments / invest_InvestmentAxis = pnbk_SolomonHessSBALoanFundMember |

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- Definition Other investments not otherwise specified in the taxonomy. + 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
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