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Note 7 - Other Real Estate Owned ("OREO") (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Real Estate Acquired Through Foreclosure | $ 0 | $ 1,900,000 |
Net Gain (Loss) Recognized on Sale or Acquisition of Other Real Estate | $ 2,000 | $ (69,000) | $ (94,000)

X
- Definition Represents the amount of net gain (loss) recognized on sale or acquisition of other real estate during the period. + References No definition available. + Details
Name: | pnbk_NetGainLossRecognizedOnSaleOrAcquisitionOfOtherRealEstate
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522 + Details
Name: | us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant