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Note 8 - Derivatives (Details Textual)	1 Months Ended			3 Months Ended		9 Months Ended
	Apr. 30, 2021 USD ($)	May 30, 2019	Nov. 30, 2018	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2021	Dec. 31, 2020 USD ($)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax				$ 64,000	$ (0)	$ 149,000	$ (0)
Interest Rate Swap [Member]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax				64,000		149,000
Derivative Termination Gain (Loss)				512,000		512,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Number of Instruments Held, Total								4
Derivative, Number of Instruments Added During the Period		2	2
Derivative, Collateral, Right to Reclaim Cash				1,400,000		1,400,000			$ 1,400,000
Gain (Loss) on Derivative Instruments, Net, Pretax, Total				$ 0	$ 0	$ 0	$ 0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount	$ 50,000,000
Derivative, Term of Contract (Year)	7 years

X

- Definition

Represents the number of derivative instruments the reporting entity became party to, or the number of new instruments it became additionally party to, during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	pnbk_
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Balance Type:	na
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X

- Definition

Represents gain (loss) on derivative termination.

+ References

No definition available.

+ Details

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X

- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313

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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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X

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

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X

- Definition

Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

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- Details

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- Details

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