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Note 11 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
SBA servicing assets |  | $ 37
Measurement Input, Discount Rate [Member] |  |
SBA servicing assets |  |
Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets |  | 0.1473
Maximum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets |  | 0.149
Fair Value of Collateral Approach [Member] |  |
Impaired loans, net | $ 20,767 | $ 19,673
Other Real Estate Owned | $ 2,400 | $ 2,945
Fair Value of Collateral Approach [Member] | Measurement Input, Discount Rate [Member] |  |
Other Real Estate Owned | 0.14 | 0.14
Fair Value of Collateral Approach [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
Impaired loans, net | 0.08 | 0.08
Fair Value of Collateral Approach [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] |  |
Impaired loans, net | 0.2 | 0.21
Valuation Technique, Discounted Cash Flow [Member] |  |
SBA servicing assets | $ 276 |
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets | 0.1473 |
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets | 0.149 |

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- Definition Fair value portion of impaired loans receivable. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure impaired loans. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the fair value of other real estate owned. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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