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Note 10 - Income Taxes (Details) - Tax Effects of Temporary Differences (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Deferred tax assets: |  |  |
Allowance for loan losses | $ 1,918 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 2,213 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 2,343 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Nonaccrual interest | 1,508 us-gaap_DeferredTaxAssetsTaxDeferredExpense | 1,474 us-gaap_DeferredTaxAssetsTaxDeferredExpense | 1,325 us-gaap_DeferredTaxAssetsTaxDeferredExpense
Depriciation of premises and equipment | 523 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 1,276 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 1,074 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accrued expenses | 292 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 376 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 225 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Share-based Compensation |  |  | 72 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
OREO Writedowns | 63 pnbk_DeferredTaxAssetsOREOWritedowns |  |
Capital loss carryover | 572 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 572 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 572 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
State NOL carryforward benefit | 3,435 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 3,613 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 3,237 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Federal NOL carryforward benefit | 17,372 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 18,427 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 15,850 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
NOL write-off for § 382 Limitation | (10,382)pnbk_DeferredTaxAssetsOperatingLossCarryforwardsWriteOff | (10,382)pnbk_DeferredTaxAssetsOperatingLossCarryforwardsWriteOff | (10,382)pnbk_DeferredTaxAssetsOperatingLossCarryforwardsWriteOff
Federal AMT benefit estimate |  |  | 318 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies
Unrealized loss AFS | 176 us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities | 462 us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities | 251 us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities
Other | 21 us-gaap_DeferredTaxAssetsOther | 37 us-gaap_DeferredTaxAssetsOther | 154 us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets | 15,498 us-gaap_DeferredTaxAssetsGross | 18,068 us-gaap_DeferredTaxAssetsGross | 15,039 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (572)us-gaap_DeferredTaxAssetsValuationAllowance | (18,068)us-gaap_DeferredTaxAssetsValuationAllowance | (15,039)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance | 14,926 us-gaap_DeferredTaxAssetsNet | 0 us-gaap_DeferredTaxAssetsNet |
Deferred tax asset, net | $ 14,926 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 18,100 us-gaap_DeferredTaxAssetsLiabilitiesNet |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from contingent liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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