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Note 11 - Fair Value and Interest Rate Risk (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Investments, Total	$ 4,450	$ 4,450
Solomon Hess SBA Loan Fund [Member]
Other Investments, Total	$ 4,500
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Stock Value Par or Stated Value per Share	$ 100

X

- Definition

Represents information about stock value par or stated value per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	pnbk_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of investments classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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Period Type:	instant

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- Details

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Namespace Prefix:
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- Details

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