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Note 4 - Available-for-sale Securities (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	10	9
Number of Available-for-sale Securities	16	11
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	4.40%	1.40%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total	$ 0
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted	7,000	$ 6,700
Available-For-Sale Securities Pledged to FRB of New York [Member]
Debt Securities, Available-for-sale, Restricted	5,500	$ 6,700
Available-For-Sale Securities Pledged to St. Louis Fed [Member]
Debt Securities, Available-for-sale, Restricted	$ 1,500

X

- Definition

The number of available-for-sale securities held.

+ References

No definition available.

+ Details

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Namespace Prefix:	pnbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Unrealized holding losses depreciation percentage from amortized cost.

+ References

No definition available.

+ Details

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X

- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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Namespace Prefix:	us-gaap_
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X

- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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X

- Definition

Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562

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- Details

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X

- Details

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X

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