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Note 13 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
SBA servicing assets | $ 301,000 |
Fair Value, Inputs, Level 3 [Member] |  |
SBA servicing assets |  | $ 280,000
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets |  | 0.1473
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets |  | 0.149
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] |  |
Impaired loans, net | 20,597,000 | $ 18,132,000
Other Real Estate Owned | $ 1,954,000 | $ 2,400,000
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Measurement Input, Discount Rate [Member] |  |
Other Real Estate Owned | 0.12 | 0.12
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
Impaired loans, net | 0.08 | 0.08
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] |  |
Impaired loans, net | 0.2 | 0.2
Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
SBA servicing assets | $ 362,000 |
Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
SBA servicing assets | 0.1473 |
Fair Value, Inputs, Level 3 [Member] | 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
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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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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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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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